WO2017145753A1 - Display control device, display control method and program - Google Patents

Display control device, display control method and program Download PDF

Info

Publication number
WO2017145753A1
WO2017145753A1 PCT/JP2017/004525 JP2017004525W WO2017145753A1 WO 2017145753 A1 WO2017145753 A1 WO 2017145753A1 JP 2017004525 W JP2017004525 W JP 2017004525W WO 2017145753 A1 WO2017145753 A1 WO 2017145753A1
Authority
WO
WIPO (PCT)
Prior art keywords
display
rate
circuit
state
display device
Prior art date
Application number
PCT/JP2017/004525
Other languages
French (fr)
Japanese (ja)
Inventor
秀紀 桑島
Original Assignee
シャープ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by シャープ株式会社 filed Critical シャープ株式会社
Priority to JP2018501551A priority Critical patent/JPWO2017145753A1/en
Publication of WO2017145753A1 publication Critical patent/WO2017145753A1/en

Links

Images

Classifications

    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/36Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/66Transforming electric information into light information

Definitions

  • the present invention relates to a display control device, a display control method, and a program for changing the display quality of an image displayed on a display device according to a viewing environment.
  • Japanese Patent Application Laid-Open No. H10-228688 discloses a content reproduction apparatus that suppresses the above-described problem.
  • video content having the same content is stored in a storage unit in a plurality of different data formats, and is detected according to a detected external environment (such as an environment where there is a lot of vibration during walking or the like).
  • An appropriate data format is selected from a plurality of different data formats, and video content in the selected data format is reproduced.
  • the detected external environment is an environment where a high-quality video cannot be properly viewed even when a high-quality video is played, such as when walking, it is not necessary to play a high-quality video content.
  • the power required in the video processing unit is suppressed by selecting and playing back video content with a low bit rate, which is one of the data formats.
  • JP 2008-10030 Japanese Patent Publication “JP 2008-10030” (published on January 17, 2008)
  • the present invention has been made in view of the above problems, and its object is to increase display quality according to whether the display device is in a moving state or a stationary state without increasing the size of the display control device.
  • the object is to realize a display control device, a display control method, and a program to be changed.
  • a display control device includes a state determination circuit that determines whether a display device that displays image data is in a moving state or a stationary state, and the state determination A display rate changing circuit that changes a transfer rate of the image data to the display device or a refresh rate of the image data in the display device according to a determination result of the circuit, the display rate changing circuit, When the display device is determined to be in the moving state by the state determination circuit, the transfer rate or the refresh rate is reduced as compared with the case where the display device is determined to be in the stationary state.
  • the display quality can be changed according to whether the display device is in a moving state or a stationary state without increasing the size of the display control device.
  • FIG. 1 It is a block diagram which shows the principal part structure of the portable terminal which concerns on Embodiment 1 of this invention. It is a flowchart which shows an example of the flow of the display rate change process in the said portable terminal. It is a figure which shows the relationship between a change of state information and a refresh rate when the display data transmission circuit of the said portable terminal changes a transfer rate according to state information. It is a figure which shows the relationship between a change of state information and a refresh rate when the transfer rate is constant and the display panel drive circuit of the said portable terminal changes a refresh rate autonomously according to state information. 5 is a flowchart showing another example of the flow of the display rate change process shown in FIG.
  • FIG. 1 is a block diagram showing a main configuration of the mobile terminal 1 (display system).
  • the portable terminal 1 is a terminal that can reproduce video content including image data.
  • the mobile terminal 1 includes a display panel (display device) 30 as a display device, a host processor 10 as a display control device of the display panel 30, a display panel drive circuit (refresh rate changing circuit) 20, and a state determination circuit 40. I have.
  • the display panel 30 is a display device that displays an image by being driven according to a drive signal from the display panel drive circuit 20.
  • the display panel 30 according to one embodiment of the present invention is a display device with a variable refresh rate.
  • the state determination circuit 40 is a circuit that determines whether the mobile terminal 1 is in a moving state or a stationary state.
  • the “movement state” means a state where the mobile terminal 1 is moving. More specifically, the moving state includes, for example, a state in which the mobile terminal 1 moves regularly in small increments.
  • the “stationary state” means a state in which the mobile terminal 1 is not moving (still).
  • the mobile terminal 1 determines whether the mobile terminal 1 is in a moving state or a stationary state, it is possible to know whether the display panel 30 provided in the mobile terminal 1 is in a moving state or a stationary state. That is, it can be said that the state of the mobile terminal 1 is equal to the state of the display panel 30 provided in the mobile terminal 1.
  • the state determination circuit 40 detects the movement (movement) of the mobile terminal 1 as a signal by using, for example, a gyro sensor or an acceleration sensor as a movement detection sensor, and the mobile terminal 1 is in a moving state based on the detection signal. Or whether it is stationary.
  • the state determination circuit 40 notifies the host processor 10 of information indicating the determination result (hereinafter, state information) at predetermined time intervals. As will be described in detail later, the state determination circuit 40 may notify the state information to the display panel drive circuit 20 instead of the host processor 10.
  • the host processor 10 is a supplier of image data (display data) to be displayed on the display panel 30, and transmits the display data to the display panel drive circuit 20 at a predetermined transfer frequency. More specifically, the host processor 10 includes display data 11 and a display data transmission circuit (transfer rate determination circuit) 12.
  • Display data 11 is image data to be displayed on the display panel 30.
  • the host processor 10 may read and acquire the display data from a storage unit (not shown) outside or inside the mobile terminal 1 or download it from the Internet or the like by a communication unit (not shown) of the mobile terminal 1. Or you may stream. Display data 11 is sent to display data transmission circuit 12.
  • the display data transmission circuit 12 receives the state information from the state determination circuit 40 and transfers the display data 11 to the display panel drive circuit 20 at a transfer rate (transfer frequency) according to the state information. More specifically, the display data transmission circuit 12 lowers the transfer rate of the display data 11 when the mobile terminal 1 is in a moving state than when the mobile terminal 1 is in a stationary state.
  • the display data transmission circuit 12 may use interlaced transfer as the transfer method of the display data 11, or may compress and transfer the display data 11. As described above, when performing transfer with reduced data transfer capacity, the display data transmission circuit 12 compresses the display data 11 and the presence / absence of interlaced transfer so that the display data 11 is normally displayed on the display panel 30. Display data information indicating the presence or absence, etc. is transmitted to the display panel drive circuit 20 together with the display data 11.
  • the display panel drive circuit 20 receives the display data 11 at an interval of the transfer rate determined by the display data transmission circuit 12 and generates a panel drive signal (drive signal for refreshing the display panel 30) based on the display data 11. And supplied to the display panel 30. That is, the display panel drive circuit 20 refreshes the display panel 30 at a refresh rate corresponding to the panel drive signal.
  • the display panel drive circuit 20 If the display panel drive circuit 20 has received display data information from the display data transmission circuit 12, the display panel 11 generates the panel drive signal after processing (decompressing) the received display data 11 according to the display data information. Good.
  • the transfer rate or the refresh rate will be described as the display rate.
  • the display rate can be changed by (1) changing only the transfer rate, (2) changing the refresh rate (when changing only the refresh rate, or when changing in conjunction with the change in the transfer rate). Also included).
  • the change of the display rate is realized by a display rate changing circuit constituted by the display data transmitting circuit 12 and the display panel driving circuit 20. The display rate changing process by the display rate changing circuit will be described below.
  • FIG. 2 is a flowchart showing the flow of display rate change processing (display control method).
  • the state determination circuit 40 determines whether the mobile terminal 1 is in a moving state or a stationary state (S10, state determination step).
  • the state information indicating the determination result is transmitted to a display rate changing circuit configured by the display data transmitting circuit 12 and the display panel driving circuit 20.
  • the display rate changing circuit changes the display rate according to the state of the mobile terminal 1 indicated by the state information.
  • the display rate changing circuit lowers the display rate than when the mobile terminal 1 is in the stationary state. (S12, display rate changing step). In this case, since the transfer rate is lowered by the display data transmission circuit 12, the refresh rate is lowered by the display panel drive circuit 20, or the transfer rate and the refresh rate are lowered, the mobile terminal 1 is in a stationary state. Display quality can be reduced.
  • the state determination circuit 40 determines that the mobile terminal 1 is in a stationary state (NO in S10), the display rate changing circuit does not change the display rate in the stationary state (S14). In this case, both the transfer rate by the display data transmission circuit 12 and the refresh rate by the display panel drive circuit 20 maintain the stationary state of the portable terminal 1, so that the display quality does not deteriorate.
  • FIG. 3 is a diagram illustrating the relationship between the state information and the refresh rate change when the display data transmission circuit 12 changes the transfer rate according to the state information.
  • “vibration 0” in the “state information” row in FIG. 3 indicates that the mobile terminal 1 is in a state without vibration (stationary state), and “vibration 1” indicates that the mobile terminal 1 is in a state with vibration (movement). State).
  • the display data 11 is transferred at a transfer rate of 120 fps (flame per second).
  • the display data transmission circuit 12 transfers the display data 11 to the display panel drive circuit 20 at 120 fps as described above. Further, the display panel drive circuit 20 generates a panel drive signal at a frequency (120 Hz) synchronized with the transfer rate, and refreshes the display panel 30. In other words, the display panel drive circuit 20 sets the refresh rate of the display panel 30 to 120 Hz.
  • the state determination circuit 40 notifies the display data transmission circuit 12 of the state, and the display data transmission circuit 12
  • the transfer rate of the display data 11 is reduced.
  • the display data transmission circuit 12 reduces the transfer rate to 60 fps.
  • the display panel drive circuit 20 generates a panel drive signal at the same interval (60 Hz) as the transfer rate of the display data 11. In other words, the display panel drive circuit 20 reduces the refresh rate of the display panel 30 to 60 Hz in conjunction with the transfer rate of the display data 11.
  • the display data transmission circuit 12 notified of the stationary state returns the transfer rate of the display data 11 to 120 fps. .
  • the refresh rate in the display panel drive circuit 20 is also changed to 120 Hz.
  • the refresh rate when there is vibration, the refresh rate is always reduced.
  • the present invention is not limited to this.
  • the display quality is displayed with vibration synchronized with the user.
  • the value is lowered, the user perceives a decrease in display quality.
  • the above-mentioned certain value is a vibration cycle when the user cannot perceive a decrease in display quality
  • a display image in a state in which the user can perceive a decrease in display quality such that the vibration period exceeds a certain value The display quality can be prevented from deteriorating. The same is true for the magnitude of vibration.
  • the mobile terminal 1 keeps the transfer rate of the display data 11 constant except that the refresh rate is indirectly changed by changing the transfer rate as described above.
  • the drive circuit 20 itself may autonomously change the refresh rate. This process will be described with reference to FIG. 4 below.
  • FIG. 4 is a diagram illustrating the relationship between the state information and the change in the refresh rate when the transfer rate is constant and the display panel driving circuit 20 autonomously changes the refresh rate according to the state information. Note that the meanings of “vibration 0” and “vibration 1” in the “status information” row in FIG. 4 are the same as those in FIG. In FIG. 4, it is assumed that the transfer rate of the display data 11 in the display data transmission circuit 12 is always 120 fps.
  • the display data transmission circuit 12 of the host processor 10 transfers the display data 11 to the display panel drive circuit 20 at a constant transfer rate (120 fps).
  • the display panel drive circuit 20 that has received the state information indicating “vibration 1” from the state determination circuit 40 has a refresh rate higher than 120 Hz. Reduce.
  • the display panel drive circuit 20 reduces the refresh rate to 60 Hz, generates a panel drive signal at 60 Hz, and refreshes the display panel 30.
  • the display panel drive circuit 20 may not simply define the refresh rate, but simply thin out the refresh of the display panel 30 (for example, a place where refreshing is performed twice in normal times is performed once).
  • the state determination circuit 40 changes from “vibration 1” to “vibration 0”
  • the display panel drive circuit 20 that has received the state information indicating “vibration 0” returns the refresh rate to 120 Hz.
  • the state determination circuit 40 notifies the display panel drive circuit 20 of the state information, and the display panel drive circuit 20 autonomously changes the refresh rate according to the state information.
  • the refresh rate can be changed according to the state information without changing the transfer rate. Therefore, it is possible to more easily change the refresh rate depending on whether the mobile terminal 1 is in a moving state or a stationary state.
  • the host processor 10 simply transfers the display data 11 at a predetermined transfer rate. Therefore, there is an advantage that a conventional host processor can be used as the host processor 10.
  • the transfer rate and refresh rate decrease rate in FIGS. 3 and 4 are examples, and the transfer rate and refresh rate decrease rate in the refresh rate change processing according to one embodiment of the present invention depends on the characteristics of the display panel 30 and the like. It may be determined accordingly. For example, the transfer rate may be decreased from 120 fps to 30 fps, and the refresh rate may be decreased from 120 Hz to 1 Hz.
  • the state determination circuit 40 changes the display rate (transfer rate, refresh rate) depending on whether the mobile terminal 1 is in a moving state or a stationary state.
  • the present invention is not limited to this, and for example, the magnitude of movement of the mobile terminal 1 (more specifically, the display panel 30) in the moving state may be determined stepwise. Then, the display rate may be changed according to the magnitude of the movement.
  • the magnitude of movement represents the period of movement of the mobile terminal and the magnitude of the movement amount.
  • FIG. 5 is a flowchart showing another example of the flow of the display rate changing process.
  • the display rate reduction rate is S24>S26> 0 (no change in display rate, S28).
  • the processing block “decrease the display rate” it is assumed that the rate of decrease in the display rate decreases as the number attached to the end of the processing block increases.
  • the state determination circuit 40 When the display panel 30 of the mobile terminal 1 starts displaying an image, the state determination circuit 40 starts determining the state of the mobile terminal 1. In the example of FIG. 5, the state determination circuit 40 detects the magnitude of movement in three stages (large movement state, small movement state, and stationary state). The detected movement state is notified to a display rate changing circuit composed of the display data transmitting circuit 12 and the display panel driving circuit 20.
  • the state determination circuit 40 determines the magnitude of movement of the mobile terminal 1 (S20 and S22). In the case of large movement (YES in S20), the display rate changing circuit lowers the display rate to the lowest level when the mobile terminal 1 is in a stationary state (S24).
  • the display rate changing circuit that has received the state information decreases the display rate of the display data 11 at a rate smaller than S24 ( S26).
  • the display rate changing circuit that has received the state information does not change the display data of the display data 11 (S28). In this case, both the transfer rate by the display data transmission circuit 12 and the refresh rate by the display panel drive circuit 20 maintain the stationary state of the portable terminal 1, so that the display quality does not deteriorate.
  • the display rate can be changed stepwise according to the magnitude of movement of the mobile terminal 1, so that the change in display quality can be made less noticeable.
  • the power consumption can be further reduced by greatly reducing the display rate.
  • the power consumption can be reduced by suppressing the rate of decrease in the display rate. And the display quality perceived by the user can be achieved at the same time.
  • the number of steps of the above movement size and the number of steps of the display rate may be arbitrarily set. In this case, it is also possible to detect the movement steplessly and change the display rate continuously.
  • the process of lowering the display rate may lower the transfer rate as shown in FIG. 3, and lower the refresh rate in conjunction with this. Further, as shown in FIG. 4, the transfer rate may be kept constant without being lowered, and only the refresh rate may be lowered.
  • the process of reducing only the refresh rate is easy to implement in that there is no need to change the normal processor display process. Therefore, among the power consumption of the portable terminal, the power consumption related to the display process of the processor is small, in other words, the display process of the processor is suitable for a relatively light system (simple portable terminal or the like).
  • a mobile terminal such as a smartphone having a display device with a high resolution these days has a large power consumption for display processing of the processor, and has a great influence on the battery life of the terminal itself.
  • the mobile terminal according to the present invention may detect whether or not the display data 11 is a moving image, and may determine the rate of decrease in the display rate according to the detection result.
  • a second embodiment of the present invention will be described with reference to FIGS.
  • the display data transmission circuit 12 changes the transfer rate of the display data 11 to indirectly change the refresh rate.
  • the display panel drive circuit 20 may autonomously change the refresh rate, as described with reference to FIG. 4 in the first embodiment. The same applies to the following embodiments.
  • FIG. 6 is a block diagram illustrating a main configuration of the mobile terminal 2 according to the present embodiment.
  • the portable terminal 2 is different from the portable terminal 1 in that a host processor 50 is provided.
  • the host processor 50 includes display data 11, a moving image detection circuit 51, and a display data transmission circuit (transfer rate determination circuit) 52.
  • the moving image detection circuit 51 is a circuit that detects whether or not the display data 11 is a moving image.
  • the moving image detection circuit 51 detects whether or not the display data 11 transferred by the display data transmission circuit 52 is a moving image, and notifies the display data transmission circuit 52 of the detection result as moving image detection information.
  • the moving image detection circuit 51 may transmit the moving image detection information to the display data transmission circuit 52 only when the display data 11 is a moving image.
  • the display data transmission circuit 52 determines the transfer rate of the display data 11 from the moving image detection information and the status information, and transmits the display data 11 to the display panel drive circuit 20 at the transfer rate. Specifically, the display data transmission circuit 52 refers to the moving image detection information, and increases the rate of decrease in the transfer rate of the display data 11 when the display data 11 is a moving image compared to when it is not a moving image. Further, the display data transmission circuit 52 refers to the moving image detection information, and when the display data 11 is a moving image, the transfer rate of the display data 11 may be reduced even when the mobile terminal 2 is in a stationary state.
  • the display data transmission circuit 52 transmits moving image detection information to the display panel driving circuit 20, and the display panel driving circuit 20 moves the moving image detection information and status information.
  • the refresh rate can be determined from the above.
  • the determination related to the determination of the refresh rate is the same as the determination related to the determination of the transfer rate described above.
  • the display data is a moving image (also in the case of CABC control described later)
  • the moving image compression rate is increased rather than the refresh rate is lowered, that is, each moving image is changed.
  • the transfer rate is defined as transfer amount / time. Therefore, the transfer rate is lowered by reducing the data amount comprehensively.
  • FIG. 7 is a flowchart illustrating an example of the flow of the display rate change process in the mobile terminal 2.
  • the state determination circuit 40 starts determining the state of the portable terminal 2.
  • the moving image detection circuit 51 detects whether or not the display data 11 is a moving image, and notifies the display data transmission circuit 52 as moving image detection information.
  • the state determination circuit 40 determines the presence / absence and size of movement in three stages (large movement, small movement, no movement).
  • the display rate changing circuit composed of the display data transmitting circuit 52 and the display panel driving circuit 20 receives the state information and the moving image detection information. If the amount of movement indicated by the status information is large (YES in S30), the display data transmission circuit 52 confirms from the moving image detection information whether the display data 11 is a moving image (S34). When the magnitude of movement indicated by the state information is small movement (NO at S30 and YES at S32), and when the state information indicates a stationary state (NO at S30 and NO at S32), display is similarly performed from the moving image detection information. It is confirmed whether or not the data 11 is a moving image (S36 and S38). Then, the display rate changing circuit determines the display rate from the two conditions of the magnitude of movement of the mobile terminal 2 and whether or not the display data 11 is a moving image.
  • the display rate changing circuit reduces the display rate most significantly when the movement of the mobile terminal 2 is large and the display data 11 is a moving image (YES in S30 and YES in S34) (S40). ).
  • the display rate changing circuit reduces the display rate at a rate next to S40 when the movement of the portable terminal 2 is large but the display data 11 is not a moving image (YES in S30 and NO in S34) (S42). ).
  • the display rate change circuit displays the display data 11 when the movement of the portable terminal 2 is the same when the display data 11 is a moving image (YES in S36).
  • the display rate is significantly reduced (S44 and 46) than when the data 11 is not a moving image (NO in S36).
  • the display rate changing circuit reduces the display rate when the display data 11 is a moving image (YES in S38) (S48).
  • the display rate changing circuit does not change the refresh rate (S50). In this case, both the transfer rate by the display data transmission circuit 12 and the refresh rate by the display panel drive circuit 20 maintain the stationary state of the portable terminal 1, so that the display quality does not deteriorate.
  • reducing the display rate increases the moving image compression rate and reduces the amount of data to be transferred, so that it is possible to reduce power consumption for data transfer. That is, in the case of a moving image, the power consumption of other parts (for example, memory, video decoder, DMA, etc.) related to image processing inside the processor can be further reduced.
  • other parts for example, memory, video decoder, DMA, etc.
  • the portable terminal according to the present invention may further determine the rate of decrease in the display rate depending on whether CABC (Contents Adaptive Backlight Control) is being applied as backlight control.
  • CABC Contents Adaptive Backlight Control
  • FIG. 8 is a block diagram illustrating a main configuration of the mobile terminal 3 according to the present embodiment.
  • the mobile terminal 3 includes a host processor 60 and a backlight 70.
  • the host processor 60 adds a CABC control circuit (backlight control circuit) 61 to the host processor 50, and changes the display data transmission circuit (transfer rate determination circuit) 52 to a display data transmission circuit (transfer rate determination circuit) 62. It is a configuration. Hereinafter, the added / modified configuration will be described. The display data transmission circuit 62 will be described only with respect to differences from the display data transmission circuit 52.
  • CABC control circuit backlight control circuit
  • the CABC control circuit 61 converts the display data 11 so that the maximum luminance value of the display data 11 transferred by the display data transmission circuit 62 becomes the maximum luminance value that can be expressed by the display panel 30 (the gradation of the display data 11). This circuit normalizes the distribution.
  • the CABC control circuit 61 receives the display data 11 acquired by the display data transmission circuit 62, normalizes it, and returns it to the display data transmission circuit 62. In the present embodiment, the display data transmission circuit 62 transfers the normalized display data 11 to the display panel drive circuit 20.
  • the backlight 70 is a backlight of the display panel 30 and changes the luminance according to the CABC control information received from the CABC control circuit 61.
  • the display data transmission circuit 62 determines the transfer rate of the display data 11 from the moving image detection information, the information received from the CABC control circuit 61 indicating whether or not CABC is being applied, and the status information, and the transfer The display data 11 is transmitted to the display panel drive circuit 20 at a rate.
  • the display data transmission circuit 52 transmits moving image detection information and information indicating whether CABC is being applied to the display panel drive circuit 20.
  • the refresh rate may be determined from the moving image detection information, information indicating whether CABC is being applied, and the state information.
  • FIG. 9 is a flowchart illustrating an example of the flow of the display rate change process in the mobile terminal 3. Note that the processing after S124 in FIG. 9 is the same as that in the flowchart shown in FIG. Also, the processing in S102 to S120 in FIG. 9 is the same as the processing in S30 to S48 in FIG.
  • the display rate changing process when the display panel 30 of the mobile terminal 3 starts displaying the display data 11, whether or not CABC is being applied to the CABC control circuit 61 and the display data transmission circuit 62 is determined. Notify the information shown.
  • the display rate changing circuit configured by the display data transmission circuit 62 and the display panel driving circuit 20 refers to the notification, and when CABC is being applied (YES in S100) or when CABC is not being applied (NO in S100). In comparison, the redisplay rate is greatly reduced (S112 to 122).
  • the display data transmission circuit 62 reduces the display rate (S122).
  • the transfer rate may be lowered by keeping it constant without lowering the refresh rate.
  • the refresh rate cannot be lowered on the display panel 30 side (the minimum refresh rate in a general liquid crystal display panel is 60 fps, and if it is further reduced, flickering occurs and display quality deteriorates. ))
  • control blocks (particularly the display data transmission circuits 12, 52 and 62, the moving image detection circuit 51, and the CABC control circuit 61) of the portable terminals 1 to 3 are logic circuits (hardware) formed in an integrated circuit (IC chip) or the like. ) Or by software using a CPU (Central Processing Unit).
  • CPU Central Processing Unit
  • the mobile terminals 1 to 3 include a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by the computer (or CPU). ) Or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) that expands the program, and the like.
  • recording media a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
  • the program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program.
  • a transmission medium such as a communication network or a broadcast wave
  • the present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
  • the display control device determines whether the display device (display panel 30) that displays the image data (display data 11) is in the moving state or the stationary state.
  • a state determination circuit 40 for determining and a display rate changing circuit for changing a transfer rate of the image data to the display device or a refresh rate of the image data on the display device according to a determination result of the state determination circuit ( Display data transmission circuits 12, 52, 62, and display panel drive circuit 20), and the display rate changing circuit (display data transmission circuits 12, 52, 62, display panel drive circuit 20) includes the state determination circuit 40. Therefore, when the display device (display panel 30) is determined to be in the moving state, the transfer rate is higher than when the display device (display panel 30) is determined to be in the stationary state. It is characterized by lowering the object or the refresh rate.
  • the display device when the display device is in a moving state, that is, when it is estimated that the display device itself or a user having the display device is moving and it is difficult to see the image displayed on the display device, the display device is Even if a fine image is displayed, it is difficult for the user to reliably recognize the image. In other words, even if the display quality of the image is somewhat reduced, the user is less likely to notice the deterioration of the display quality.
  • the display device when the display device is in the moving state, if the transfer rate of the image data to the display device or the refresh rate of the image data on the display device is lowered as compared with the case where the display device is determined to be stationary.
  • the transfer rate of the image data to the display device or the refresh rate of the image data on the display device is lowered as compared with the case where the display device is determined to be stationary.
  • the display transfer rate of image data or the refresh rate of the image data on the display device is changed in real time, it is not necessary to previously store image data for display at a plurality of transfer rates or a plurality of refresh rates. . For this reason, the capacity of the storage unit for storing image data can be reduced. Therefore, it is possible to display the image data at a transfer rate or a refresh rate according to the use environment of the display device while preventing an increase in size of the device due to an increase in the capacity of the storage unit.
  • the display control device is the display control device according to aspect 1, wherein the state determination circuit determines the magnitude of movement of the display device in the moving state in a stepwise manner, and the display rate changing circuit is The transfer rate or the refresh rate is changed according to the amount of movement of the display device.
  • the transfer rate or the refresh rate can be changed stepwise according to the movement of the display device, so that the change in display quality can be made less noticeable.
  • the power consumption can be further reduced by greatly reducing the transfer rate or the refresh rate.
  • the display device is moving but the movement is small, that is, when it is easy for the user to perceive the deterioration in display quality compared to when the display device is moving greatly, by suppressing the rate of decrease in transfer rate or refresh rate
  • a display control device further includes a moving image detection circuit (moving image detection circuit 51) for detecting whether or not the image data is a moving image in any one of the aspects 1 or 2.
  • the display rate changing circuit is characterized in that the transfer rate or the refresh rate is changed in accordance with a determination result of the state determination circuit and a detection result of the moving image detection circuit.
  • the image data is a moving image
  • the display quality of the image data is somewhat lowered, it can be said that this is difficult for the user to perceive. Therefore, according to the above configuration, by changing the transfer rate or the refresh rate according to whether the image data is a moving image, it is possible to achieve both a reduction in display quality and a reduction in power consumption. Play.
  • the display control apparatus is the display control apparatus according to any one of the aspects 1 to 3, wherein the backlight brightness of the display device and the image to be displayed are displayed according to the characteristics of the image data displayed on the display device.
  • the display control circuit further includes a backlight control circuit (CABC control circuit 61) that changes the gradation distribution of data, and the display rate changing circuit depends on whether or not the backlight control by the backlight control circuit is executed. The transfer rate or the refresh rate is changed.
  • CABC control circuit 61 backlight control circuit that changes the gradation distribution of data, and the display rate changing circuit depends on whether or not the backlight control by the backlight control circuit is executed. The transfer rate or the refresh rate is changed.
  • CABC backlight control
  • the power consumption is reduced, but the display quality is also lowered by changing (normalizing) the gradation distribution of the image data. Therefore, the case where the backlight control is executed is a situation in which the viewing quality is not affected even if the display quality of the image data is slightly lowered, or the display quality is not considered important in the viewing. It can be said that there is.
  • the transfer rate or refresh rate can be changed more to reduce power consumption in situations where degradation of the display quality of image data is not a problem. can do.
  • a display system (portable terminal 1, 2 or 3) according to aspect 5 of the present invention provides a display control device according to any one of aspects 1 to 4 and image data according to control from the display control apparatus. And a display device (display panel 30) for display. According to said structure, there exists an effect similar to the display control apparatus which concerns on aspect 1-4.
  • the display control method according to aspect 6 of the present invention is in the moving state by the state determining step (S10) for determining whether the display device that displays the image data is in the moving state or the stationary state, and the state determining step.

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Controls And Circuits For Display Device (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Television Systems (AREA)

Abstract

According to the present invention, image data is displayed according to a movement state of a display device without enlarging a display control device. Each of mobile terminals (1-3) is provided with: a state determining circuit (40) which determines whether the own terminal is in a movement state or a stop state; a display data transmitting circuit (12) which, when the own terminal is determined to be in the movement state by the state determining circuit (40), allows a transmission rate or a refresh rate to become lower than that when determined to be in the stop state; and a display panel driving circuit (20).

Description

表示制御装置、表示制御方法及びプログラムDisplay control apparatus, display control method, and program
 本発明は、視聴環境に応じて表示装置に表示される画像の表示品質を変更する表示制御装置、表示制御方法及びプログラムに関する。 The present invention relates to a display control device, a display control method, and a program for changing the display quality of an image displayed on a display device according to a viewing environment.
 最近、デジタル技術の進歩に伴い、例えば携帯型のコンテンツ再生装置が良く用いられている。このような携帯型コンテンツ再生装置においては、歩行時等、振動が多く、映像をきちんと見ることができるかどうかに関係なく同じように映像の再生処理を行っているのが一般的である。 Recently, with the advancement of digital technology, for example, portable content playback devices are often used. In such a portable content playback apparatus, it is general that the video playback process is performed in the same manner regardless of whether the video can be viewed properly, such as when walking, with a lot of vibration.
 ところで、上記のような一般的な携帯型コンテンツ再生装置において、映像等をきちんと見られないような状況においても、必要以上のクオリティで映像コンテンツの再生を行うため、処理に要する消費電力が大きくなるという問題があった。 By the way, in the general portable content playback apparatus as described above, video content is played back with higher quality than necessary even in a situation where the video or the like cannot be properly viewed, so that the power consumption required for processing increases. There was a problem.
 そこで、歩行時等には高品質な映像を再生してもきちんと映像を見ることができず、高品質であってもあまり効果がないため、映像処理能力を落として映像処理部における必要な電力を抑えるコンテンツ再生装置が特許文献1に開示されている。 Therefore, even if you play a high-quality video when walking, you cannot see the video properly, and even if it is high-quality, it is not very effective. Japanese Patent Application Laid-Open No. H10-228688 discloses a content reproduction apparatus that suppresses the above-described problem.
 特許文献1に開示されたコンテンツ再生装置では、同一内容の映像コンテンツを複数の異なるデータ形式で蓄積部に記憶しておき、検出した外部環境(歩行時等の振動が多い環境等)に応じて、複数の異なるデータ形式の中から適切なデータ形式を選択し、選択したデータ形式の映像コンテンツを再生している。例えば、検出した外部環境が歩行時等のように高品質な映像を再生してもきちんと映像を見ることができない環境であれば、高品質の映像コンテンツを再生する必要がない。そのような環境では、データ形式の一つであるビットレートの低い映像コンテンツを選択して再生することで映像処理部における必要な電力を抑えている。 In the content reproduction apparatus disclosed in Patent Document 1, video content having the same content is stored in a storage unit in a plurality of different data formats, and is detected according to a detected external environment (such as an environment where there is a lot of vibration during walking or the like). An appropriate data format is selected from a plurality of different data formats, and video content in the selected data format is reproduced. For example, if the detected external environment is an environment where a high-quality video cannot be properly viewed even when a high-quality video is played, such as when walking, it is not necessary to play a high-quality video content. In such an environment, the power required in the video processing unit is suppressed by selecting and playing back video content with a low bit rate, which is one of the data formats.
日本国公開特許公報「特開2008-10030号」(2008年1月17日公開)Japanese Patent Publication “JP 2008-10030” (published on January 17, 2008)
 しかしながら、特許文献1に開示されたコンテンツ再生装置では、同一内容の映像コンテンツを複数の異なるデータ形式(ビットレート)で蓄積部に記憶させる必要がある。そのため、多数の映像コンテンツのビットレートを選択して出力することを可能にするには、それだけ多数の記憶領域が必要である。このように、コンテンツ再生装置には記憶容量の大きな蓄積部が必要となるため、コンテンツ再生装置が大型化するという問題があった。 However, in the content reproduction apparatus disclosed in Patent Document 1, it is necessary to store video content having the same content in a storage unit in a plurality of different data formats (bit rates). Therefore, in order to select and output a bit rate of a large number of video contents, a large number of storage areas are required. As described above, since the content reproducing apparatus requires a storage unit having a large storage capacity, there is a problem that the content reproducing apparatus is increased in size.
 本発明は、前記の問題点に鑑みてなされたものであり、その目的は、表示制御装置を大型化させずに、表示装置が移動状態および静止状態のいずれであるかに応じて表示品質を変更する表示制御装置、表示制御方法及びプログラムを実現することにある。 The present invention has been made in view of the above problems, and its object is to increase display quality according to whether the display device is in a moving state or a stationary state without increasing the size of the display control device. The object is to realize a display control device, a display control method, and a program to be changed.
 上記の課題を解決するために、本発明の一態様に係る表示制御装置は、画像データを表示する表示装置が移動状態および静止状態のいずれであるかを判定する状態判定回路と、上記状態判定回路の判定結果に応じて、上記画像データの上記表示装置への転送レートまたは上記画像データの上記表示装置でのリフレッシュレートを変更する表示レート変更回路と、を備え、上記表示レート変更回路は、上記状態判定回路により上記表示装置が移動状態であると判定された場合に、上記静止状態と判定された場合よりも上記転送レートまたは上記リフレッシュレートを低下させることを特徴としている。 In order to solve the above problems, a display control device according to one embodiment of the present invention includes a state determination circuit that determines whether a display device that displays image data is in a moving state or a stationary state, and the state determination A display rate changing circuit that changes a transfer rate of the image data to the display device or a refresh rate of the image data in the display device according to a determination result of the circuit, the display rate changing circuit, When the display device is determined to be in the moving state by the state determination circuit, the transfer rate or the refresh rate is reduced as compared with the case where the display device is determined to be in the stationary state.
 本発明の一態様によれば、表示制御装置を大型化させずに、表示装置が移動状態および静止状態のいずれであるかに応じて表示品質を変更することができる。 According to one aspect of the present invention, the display quality can be changed according to whether the display device is in a moving state or a stationary state without increasing the size of the display control device.
本発明の実施形態1に係る携帯端末の要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of the portable terminal which concerns on Embodiment 1 of this invention. 上記携帯端末における表示レート変更処理の流れの一例を示すフローチャートである。It is a flowchart which shows an example of the flow of the display rate change process in the said portable terminal. 上記携帯端末の表示データ送信回路が状態情報に応じて転送レートを変更した場合の、状態情報とリフレッシュレートの変化との関係を示す図である。It is a figure which shows the relationship between a change of state information and a refresh rate when the display data transmission circuit of the said portable terminal changes a transfer rate according to state information. 転送レートが一定であり、上記携帯端末の表示パネル駆動回路が状態情報に応じて自律的にリフレッシュレートを変更する場合の、状態情報とリフレッシュレートの変化との関係を示す図である。It is a figure which shows the relationship between a change of state information and a refresh rate when the transfer rate is constant and the display panel drive circuit of the said portable terminal changes a refresh rate autonomously according to state information. 図2に示す表示レート変更処理の流れの他の一例を示すフローチャートである。5 is a flowchart showing another example of the flow of the display rate change process shown in FIG. 本発明の実施形態2に係る携帯端末の要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of the portable terminal which concerns on Embodiment 2 of this invention. 上記携帯端末における表示レート変更処理の流れの一例を示すフローチャートである。It is a flowchart which shows an example of the flow of the display rate change process in the said portable terminal. 本発明の実施形態3に係る携帯端末の要部構成を示すブロック図である。It is a block diagram which shows the principal part structure of the portable terminal which concerns on Embodiment 3 of this invention. 上記携帯端末における表示レート変更処理の流れの一例を示すフローチャートである。It is a flowchart which shows an example of the flow of the display rate change process in the said portable terminal.
 〔実施形態1〕
 以下、本発明の第1の実施形態について図1~5を参照して説明する。まず始めに、本実施形態に係る携帯端末1の要部構成について、図1を用いて説明する。図1は、携帯端末1(表示システム)の要部構成を示すブロック図である。
Embodiment 1
A first embodiment of the present invention will be described below with reference to FIGS. First, the main configuration of the mobile terminal 1 according to the present embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing a main configuration of the mobile terminal 1 (display system).
 (携帯端末1)
 携帯端末1は、画像データを含む映像コンテンツを再生可能な端末である。携帯端末1は、表示装置としての表示パネル(表示装置)30と、表示パネル30の表示制御装置としてのホストプロセッサ10、表示パネル駆動回路(リフレッシュレート変更回路)20、および状態判定回路40とを備えている。
(Mobile terminal 1)
The portable terminal 1 is a terminal that can reproduce video content including image data. The mobile terminal 1 includes a display panel (display device) 30 as a display device, a host processor 10 as a display control device of the display panel 30, a display panel drive circuit (refresh rate changing circuit) 20, and a state determination circuit 40. I have.
 表示パネル30は、表示パネル駆動回路20からの駆動信号に応じて駆動することにより画像を表示する表示装置である。本発明の一態様に係る表示パネル30はリフレッシュレートが可変な表示装置である。 The display panel 30 is a display device that displays an image by being driven according to a drive signal from the display panel drive circuit 20. The display panel 30 according to one embodiment of the present invention is a display device with a variable refresh rate.
 状態判定回路40は、携帯端末1が移動状態および静止状態のいずれであるかを判定する回路である。ここで、「移動状態」とは、携帯端末1が移動している状態を意味する。より具体的に言えば、移動状態とは、例えば携帯端末1が規則的に小刻みに動いているような状態を含む。一方、「静止状態」とは、携帯端末1が移動していない(静止している)状態を意味する。 The state determination circuit 40 is a circuit that determines whether the mobile terminal 1 is in a moving state or a stationary state. Here, the “movement state” means a state where the mobile terminal 1 is moving. More specifically, the moving state includes, for example, a state in which the mobile terminal 1 moves regularly in small increments. On the other hand, the “stationary state” means a state in which the mobile terminal 1 is not moving (still).
 このように、携帯端末1が移動状態か静止状態かを判定することにより、携帯端末1に備えられた表示パネル30が移動状態であるか静止状態であるかも分かる。つまり、携帯端末1の状態は当該携帯端末1に備えられた表示パネル30の状態と等しいといえる。 Thus, by determining whether the mobile terminal 1 is in a moving state or a stationary state, it is possible to know whether the display panel 30 provided in the mobile terminal 1 is in a moving state or a stationary state. That is, it can be said that the state of the mobile terminal 1 is equal to the state of the display panel 30 provided in the mobile terminal 1.
 具体的には、状態判定回路40は、移動検出用のセンサとして例えばジャイロセンサや加速度センサにより携帯端末1の動き(移動)を信号として検出し、検出信号に基づき携帯端末1が移動状態であるか静止状態であるかを判定する。状態判定回路40は、判定結果を示す情報(以下、状態情報)を所定の時間間隔でホストプロセッサ10に通知する。なお、詳しくは後述するが、状態判定回路40はホストプロセッサ10ではなく表示パネル駆動回路20に上記状態情報を通知してもよい。 Specifically, the state determination circuit 40 detects the movement (movement) of the mobile terminal 1 as a signal by using, for example, a gyro sensor or an acceleration sensor as a movement detection sensor, and the mobile terminal 1 is in a moving state based on the detection signal. Or whether it is stationary. The state determination circuit 40 notifies the host processor 10 of information indicating the determination result (hereinafter, state information) at predetermined time intervals. As will be described in detail later, the state determination circuit 40 may notify the state information to the display panel drive circuit 20 instead of the host processor 10.
 ホストプロセッサ10は、表示パネル30に表示させる画像のデータ(表示データ)の供給元であり、当該表示データを所定の転送周波数で表示パネル駆動回路20に送信する。ホストプロセッサ10はより詳しくは、表示データ11と、表示データ送信回路(転送レート決定回路)12とを含む。 The host processor 10 is a supplier of image data (display data) to be displayed on the display panel 30, and transmits the display data to the display panel drive circuit 20 at a predetermined transfer frequency. More specifically, the host processor 10 includes display data 11 and a display data transmission circuit (transfer rate determination circuit) 12.
 表示データ11は、表示パネル30に表示すべき画像のデータである。ホストプロセッサ10は当該表示データを、携帯端末1の外部または内部の記憶部(図示せず)から読み出して取得してもよいし、携帯端末1の通信部(図示せず)によりインターネット等からダウンロードまたはストリーミングしてもよい。表示データ11は、表示データ送信回路12に送られる。 Display data 11 is image data to be displayed on the display panel 30. The host processor 10 may read and acquire the display data from a storage unit (not shown) outside or inside the mobile terminal 1 or download it from the Internet or the like by a communication unit (not shown) of the mobile terminal 1. Or you may stream. Display data 11 is sent to display data transmission circuit 12.
 表示データ送信回路12は、状態判定回路40から状態情報を受信し、当該状態情報に応じた転送レート(転送頻度)で表示データ11を表示パネル駆動回路20に転送する。より具体的には、表示データ送信回路12は、携帯端末1が移動状態である場合、携帯端末1が静止状態の場合よりも表示データ11の転送レートを低下させる。 The display data transmission circuit 12 receives the state information from the state determination circuit 40 and transfers the display data 11 to the display panel drive circuit 20 at a transfer rate (transfer frequency) according to the state information. More specifically, the display data transmission circuit 12 lowers the transfer rate of the display data 11 when the mobile terminal 1 is in a moving state than when the mobile terminal 1 is in a stationary state.
 なお、表示データ送信回路12は表示データ11の転送方式をインタレース転送にしてもよいし、表示データ11を圧縮して転送してもよい。このように、データ転送容量を削減した転送を行う場合、表示データ送信回路12は表示パネル30に表示データ11が正常に表示されるようにするため、インタレース転送の有無や表示データ11の圧縮の有無などを示す表示データ情報を、表示データ11とともに表示パネル駆動回路20に送信する。 It should be noted that the display data transmission circuit 12 may use interlaced transfer as the transfer method of the display data 11, or may compress and transfer the display data 11. As described above, when performing transfer with reduced data transfer capacity, the display data transmission circuit 12 compresses the display data 11 and the presence / absence of interlaced transfer so that the display data 11 is normally displayed on the display panel 30. Display data information indicating the presence or absence, etc. is transmitted to the display panel drive circuit 20 together with the display data 11.
 表示パネル駆動回路20は、表示データ送信回路12が定める転送レートの間隔で表示データ11を受信し、当該表示データ11に基づいたパネル駆動信号(表示パネル30のリフレッシュのための駆動信号)を生成し、表示パネル30に供給する。すなわち、表示パネル駆動回路20は、パネル駆動信号に応じたリフレッシュレートにより表示パネル30をリフレッシュさせる。 The display panel drive circuit 20 receives the display data 11 at an interval of the transfer rate determined by the display data transmission circuit 12 and generates a panel drive signal (drive signal for refreshing the display panel 30) based on the display data 11. And supplied to the display panel 30. That is, the display panel drive circuit 20 refreshes the display panel 30 at a refresh rate corresponding to the panel drive signal.
 なお、表示パネル駆動回路20は表示データ送信回路12から表示データ情報を受信していた場合、当該表示データ情報に従って受信した表示データ11を加工(解凍など)してからパネル駆動信号を生成すればよい。 If the display panel drive circuit 20 has received display data information from the display data transmission circuit 12, the display panel 11 generates the panel drive signal after processing (decompressing) the received display data 11 according to the display data information. Good.
 ここ以降では、上記転送レート、上記リフレッシュレートの何れかを表示レートとして説明する。なお、表示レートの変更には、(1)転送レートのみを変更する場合、(2)リフレッシュレートを変更する場合(リフレッシュレートのみを変更する場合と、転送レートの変更に連動して変更する場合も含む)を意味する。また、この表示レートの変更は、上記表示データ送信回路12及び表示パネル駆動回路20で構成される表示レート変更回路によって実現される。この表示レート変更回路による表示レートの変更処理について以下に説明する。 In the following description, either the transfer rate or the refresh rate will be described as the display rate. The display rate can be changed by (1) changing only the transfer rate, (2) changing the refresh rate (when changing only the refresh rate, or when changing in conjunction with the change in the transfer rate). Also included). The change of the display rate is realized by a display rate changing circuit constituted by the display data transmitting circuit 12 and the display panel driving circuit 20. The display rate changing process by the display rate changing circuit will be described below.
 (表示レート変更処理の概要説明)
 図2は、表示レート変更処理の流れ(表示制御方法)を示すフローチャートである。
(Overview of display rate change processing)
FIG. 2 is a flowchart showing the flow of display rate change processing (display control method).
 携帯端末1の表示パネル30が画像の表示を開始すると、状態判定回路40は携帯端末1が移動状態であるか、静止状態であるかを判定する(S10、状態判定ステップ)。判定結果を示す状態情報は、表示データ送信回路12及び表示パネル駆動回路20で構成される表示レート変更回路に送信される。表示レート変更回路は状態情報を受信すると、当該状態情報が示す携帯端末1の状態に応じて表示レートを変更する。具体的には、表示レート変更回路は、状態判定回路40により携帯端末1が移動状態であると判定された場合(S10でYES)、表示レートを携帯端末1が静止状態である場合よりも低下させる(S12、表示レート変更ステップ)。この場合、表示データ送信回路12による転送レートの低下、表示パネル駆動回路20によるリフレッシュレートの低下、あるいは転送レート及びリフレッシュレートの低下の何れかとなるため、携帯端末1が静止状態である場合よりも表示品質を低下させることができる。 When the display panel 30 of the mobile terminal 1 starts displaying an image, the state determination circuit 40 determines whether the mobile terminal 1 is in a moving state or a stationary state (S10, state determination step). The state information indicating the determination result is transmitted to a display rate changing circuit configured by the display data transmitting circuit 12 and the display panel driving circuit 20. When receiving the state information, the display rate changing circuit changes the display rate according to the state of the mobile terminal 1 indicated by the state information. Specifically, when the mobile terminal 1 is determined to be in the moving state by the state determination circuit 40 (YES in S10), the display rate changing circuit lowers the display rate than when the mobile terminal 1 is in the stationary state. (S12, display rate changing step). In this case, since the transfer rate is lowered by the display data transmission circuit 12, the refresh rate is lowered by the display panel drive circuit 20, or the transfer rate and the refresh rate are lowered, the mobile terminal 1 is in a stationary state. Display quality can be reduced.
 一方、状態判定回路40により携帯端末1が静止状態であると判定された場合(S10でNO)、表示レート変更回路は、静止状態の表示レートを変更させない(S14)。この場合、表示データ送信回路12による転送レート、表示パネル駆動回路20によるリフレッシュレートは何れも携帯端末1が静止状態の状態が維持されるため、表示品質の低下は生じない。 On the other hand, when the state determination circuit 40 determines that the mobile terminal 1 is in a stationary state (NO in S10), the display rate changing circuit does not change the display rate in the stationary state (S14). In this case, both the transfer rate by the display data transmission circuit 12 and the refresh rate by the display panel drive circuit 20 maintain the stationary state of the portable terminal 1, so that the display quality does not deteriorate.
 (効果)
 携帯端末1が移動状態の場合、すなわち、携帯端末1または携帯端末1を持つユーザが動いていて、表示パネル30が見えにくいと推定される場合は、表示パネル30に高精細な画像を表示してもユーザが当該画像を確実に認識することは難しい。換言すると、携帯端末1または携帯端末1を持つユーザが動いているときは、画像の表示品質を多少落としたとしても、ユーザは表示品質の劣化に気付きにくい。上述のように、表示レートのうち、例えばリフレッシュレート変更処理によると、携帯端末1のユーザがこのように品質劣化に気付きにくい状況下で表示パネル30のリフレッシュレートを低下させることで、画像の表示に係る消費電力を削減することができるという効果を奏する。
(effect)
When the mobile terminal 1 is in a moving state, that is, when it is estimated that the mobile terminal 1 or a user having the mobile terminal 1 is moving and the display panel 30 is difficult to see, a high-definition image is displayed on the display panel 30. However, it is difficult for the user to reliably recognize the image. In other words, when the mobile terminal 1 or the user having the mobile terminal 1 is moving, even if the display quality of the image is slightly reduced, the user is less likely to notice the deterioration of the display quality. As described above, according to, for example, the refresh rate changing process among the display rates, the user of the mobile terminal 1 reduces the refresh rate of the display panel 30 in a situation where it is difficult for the user of the mobile terminal 1 to notice the quality deterioration. There is an effect that power consumption according to the above can be reduced.
 次に、携帯端末1の状態に応じた表示レートの変更の一例として、リフレッシュレートの変更方法について、図3、および図4を参照しながら以下に説明する。 Next, as an example of changing the display rate according to the state of the mobile terminal 1, a method for changing the refresh rate will be described below with reference to FIGS.
 (リフレッシュレート変更方法)
 図3は、表示データ送信回路12が状態情報に応じて転送レートを変更した場合の、状態情報とリフレッシュレートの変化との関係を示す図である。なお、図3の「状態情報」行の「振動0」は携帯端末1が振動なしの状態(静止状態)であることを示し、「振動1」は、携帯端末1が振動有りの状態(移動状態)と判定された場合であることを示す。また、図3の例では、携帯端末1が静止状態のときは、120fps(flame per second)の転送レートで表示データ11を転送することとする。
(How to change the refresh rate)
FIG. 3 is a diagram illustrating the relationship between the state information and the refresh rate change when the display data transmission circuit 12 changes the transfer rate according to the state information. Note that “vibration 0” in the “state information” row in FIG. 3 indicates that the mobile terminal 1 is in a state without vibration (stationary state), and “vibration 1” indicates that the mobile terminal 1 is in a state with vibration (movement). State). In the example of FIG. 3, when the mobile terminal 1 is in a stationary state, the display data 11 is transferred at a transfer rate of 120 fps (flame per second).
 携帯端末1が「振動0」、すなわち静止状態である場合、表示データ送信回路12は上述の通り120fpsで表示パネル駆動回路20に表示データ11を転送する。また、表示パネル駆動回路20は転送レートと同調した周波数(120Hz)でパネル駆動信号を生成し、表示パネル30をリフレッシュする。換言すると、表示パネル駆動回路20は、表示パネル30のリフレッシュレートを120Hzとしている。 When the mobile terminal 1 is “vibration 0”, that is, in a stationary state, the display data transmission circuit 12 transfers the display data 11 to the display panel drive circuit 20 at 120 fps as described above. Further, the display panel drive circuit 20 generates a panel drive signal at a frequency (120 Hz) synchronized with the transfer rate, and refreshes the display panel 30. In other words, the display panel drive circuit 20 sets the refresh rate of the display panel 30 to 120 Hz.
 ここで携帯端末1が「振動0」から「振動1」になった(移動状態になった)場合、状態判定回路40は当該状態を表示データ送信回路12に通知し、表示データ送信回路12は表示データ11の転送レートを低下させる。例えば、図3の例のように、表示データ送信回路12は転送レートを60fpsまで低下させる。一方表示パネル駆動回路20は、表示データ11の転送レートと同間隔(60Hz)でパネル駆動信号を生成する。換言すると、表示パネル駆動回路20は、表示データ11の転送レートと連動して表示パネル30のリフレッシュレートを60Hzに低下させる。 When the portable terminal 1 changes from “vibration 0” to “vibration 1” (becomes a moving state), the state determination circuit 40 notifies the display data transmission circuit 12 of the state, and the display data transmission circuit 12 The transfer rate of the display data 11 is reduced. For example, as in the example of FIG. 3, the display data transmission circuit 12 reduces the transfer rate to 60 fps. On the other hand, the display panel drive circuit 20 generates a panel drive signal at the same interval (60 Hz) as the transfer rate of the display data 11. In other words, the display panel drive circuit 20 reduces the refresh rate of the display panel 30 to 60 Hz in conjunction with the transfer rate of the display data 11.
 一方、携帯端末1が「振動1」から「振動0」になった(静止状態になった)場合、静止状態を通知された表示データ送信回路12は、表示データ11の転送レートを120fpsに戻す。そして、これに連動して表示パネル駆動回路20におけるリフレッシュレートも120Hzに変更される。 On the other hand, when the portable terminal 1 changes from “vibration 1” to “vibration 0” (becomes stationary), the display data transmission circuit 12 notified of the stationary state returns the transfer rate of the display data 11 to 120 fps. . In conjunction with this, the refresh rate in the display panel drive circuit 20 is also changed to 120 Hz.
 なお、上記の説明では、振動の有る場合は、常にリフレッシュレートを下げる処理を行っているが、これに限定されるものではない。例えば振動の周期および大きさの両方あるいはいずれか一方がある値よりも大きくなると、表示画像が見にくくなっていると想定し、その場合にリフレッシュレートを下げる処理を行うようにしてもよい。これにより、不要な表示品質の低下をユーザに知覚させることを防止することができる。例えばユーザと携帯端末自体がほぼ同期して長い周期(低周波数)で移動しているような場合(例えばユーザが電車等の移動手段に乗っている場合)では、ユーザと同期した振動で表示品質を下げるとユーザは表示品質の低下を知覚してしまう。そこで、上記のある値を、ユーザが表示品質の低下を知覚できなくなる場合の振動の周期とすれば、振動周期がある値以上のようにユーザが表示品質の低下を知覚できる状態での表示画像の表示品質が下がるのを防止することができる。振動の大きさに関しても同様のことが言える。 In the above description, when there is vibration, the refresh rate is always reduced. However, the present invention is not limited to this. For example, when both or both of the period and the magnitude of vibration become larger than a certain value, it is assumed that the display image is difficult to see, and in that case, the refresh rate may be lowered. Thereby, it is possible to prevent the user from perceiving unnecessary display quality degradation. For example, when the user and the mobile terminal are moving in a long cycle (low frequency) almost in synchronization (for example, when the user is on a moving means such as a train), the display quality is displayed with vibration synchronized with the user. When the value is lowered, the user perceives a decrease in display quality. Therefore, if the above-mentioned certain value is a vibration cycle when the user cannot perceive a decrease in display quality, a display image in a state in which the user can perceive a decrease in display quality such that the vibration period exceeds a certain value. The display quality can be prevented from deteriorating. The same is true for the magnitude of vibration.
 また、図3に示すように、携帯端末1は、上述のように転送レートを変更することにより、間接的にリフレッシュレートを変更する以外に、表示データ11の転送レートは一定としておき、表示パネル駆動回路20自体がリフレッシュレートを自律的に変更することとしてもよい。この処理について以下の図4を参照しながら説明する。 As shown in FIG. 3, the mobile terminal 1 keeps the transfer rate of the display data 11 constant except that the refresh rate is indirectly changed by changing the transfer rate as described above. The drive circuit 20 itself may autonomously change the refresh rate. This process will be described with reference to FIG. 4 below.
 (リフレッシュレート変更方法の他の例)
 図4は、転送レートが一定であり、表示パネル駆動回路20が状態情報に応じて自律的にリフレッシュレートを変更する場合の、状態情報とリフレッシュレートの変化との関係を示す図である。なお、図4の「状態情報」行の「振動0」および「振動1」の意味は図3と同義である。また、図4では、表示データ送信回路12における表示データ11の転送レートは常時120fpsであることとする。
(Another example of refresh rate change method)
FIG. 4 is a diagram illustrating the relationship between the state information and the change in the refresh rate when the transfer rate is constant and the display panel driving circuit 20 autonomously changes the refresh rate according to the state information. Note that the meanings of “vibration 0” and “vibration 1” in the “status information” row in FIG. 4 are the same as those in FIG. In FIG. 4, it is assumed that the transfer rate of the display data 11 in the display data transmission circuit 12 is always 120 fps.
 表示パネル30が画像を表示するとき、ホストプロセッサ10の表示データ送信回路12は、一定の転送レート(120fps)で表示パネル駆動回路20に表示データ11を転送する。ここで、携帯端末1が「振動0」から「振動1」になった場合、状態判定回路40から「振動1」を示す状態情報を受信した表示パネル駆動回路20は、リフレッシュレートを120Hzよりも低下させる。例えば、図4の例のように、表示パネル駆動回路20はリフレッシュレートを60Hzまで低下させ、60Hzでパネル駆動信号を生成し、表示パネル30をリフレッシュする。なお、表示パネル駆動回路20はリフレッシュレートを規定するのではなく、単に表示パネル30のリフレッシュを間引き(通常時2回リフレッシュする所を1回にするなど)してもよい。そして、状態判定回路40が「振動1」から「振動0」になると、「振動0」を示す状態情報を受信した表示パネル駆動回路20はリフレッシュレートを120Hzに戻す。 When the display panel 30 displays an image, the display data transmission circuit 12 of the host processor 10 transfers the display data 11 to the display panel drive circuit 20 at a constant transfer rate (120 fps). Here, when the portable terminal 1 changes from “vibration 0” to “vibration 1”, the display panel drive circuit 20 that has received the state information indicating “vibration 1” from the state determination circuit 40 has a refresh rate higher than 120 Hz. Reduce. For example, as in the example of FIG. 4, the display panel drive circuit 20 reduces the refresh rate to 60 Hz, generates a panel drive signal at 60 Hz, and refreshes the display panel 30. Note that the display panel drive circuit 20 may not simply define the refresh rate, but simply thin out the refresh of the display panel 30 (for example, a place where refreshing is performed twice in normal times is performed once). When the state determination circuit 40 changes from “vibration 1” to “vibration 0”, the display panel drive circuit 20 that has received the state information indicating “vibration 0” returns the refresh rate to 120 Hz.
 このように、状態判定回路40が表示パネル駆動回路20に状態情報を通知し、当該状態情報に応じて、表示パネル駆動回路20が自律的にリフレッシュレートを変更する。これにより、転送レートは変更せずに、状態情報に応じてリフレッシュレートを変更することが可能である。したがって、携帯端末1が移動状態であるか静止状態であるかに応じてリフレッシュレートの変更をより容易に実現できる。また、図4に示す例の場合は、ホストプロセッサ10は単に所定の転送レートで表示データ11を転送するのみであるので、従来あるホストプロセッサをホストプロセッサ10として用いることができるという利点が生じる。 Thus, the state determination circuit 40 notifies the display panel drive circuit 20 of the state information, and the display panel drive circuit 20 autonomously changes the refresh rate according to the state information. As a result, the refresh rate can be changed according to the state information without changing the transfer rate. Therefore, it is possible to more easily change the refresh rate depending on whether the mobile terminal 1 is in a moving state or a stationary state. In the case of the example shown in FIG. 4, the host processor 10 simply transfers the display data 11 at a predetermined transfer rate. Therefore, there is an advantage that a conventional host processor can be used as the host processor 10.
 なお、図3および図4における、転送レートおよびリフレッシュレートの低下割合は一例であり、本発明の一態様に係るリフレッシュレート変更処理における転送レートおよびリフレッシュレートの低下割合は表示パネル30の特性等に応じて、適宜決定してよい。例えば、転送レートを120fpsから30fpsに落としてもよいし、リフレッシュレートを120Hzから1Hzまで落としてもよい。 Note that the transfer rate and refresh rate decrease rate in FIGS. 3 and 4 are examples, and the transfer rate and refresh rate decrease rate in the refresh rate change processing according to one embodiment of the present invention depends on the characteristics of the display panel 30 and the like. It may be determined accordingly. For example, the transfer rate may be decreased from 120 fps to 30 fps, and the refresh rate may be decreased from 120 Hz to 1 Hz.
 なお、図2では、状態判定回路40は携帯端末1が移動状態であるか静止状態であるかに応じて表示レート(転送レート、リフレッシュレート)を変更する例を示した。しかしながら、これに限定されるものではなく、例えば、移動状態における携帯端末1(より詳しくは表示パネル30)の移動の大きさを段階的に判定してもよい。そして、上記移動の大きさに応じて表示レートを変更してもよい。 2 shows an example in which the state determination circuit 40 changes the display rate (transfer rate, refresh rate) depending on whether the mobile terminal 1 is in a moving state or a stationary state. However, the present invention is not limited to this, and for example, the magnitude of movement of the mobile terminal 1 (more specifically, the display panel 30) in the moving state may be determined stepwise. Then, the display rate may be changed according to the magnitude of the movement.
 なお、上記および以降に記載の「移動の大きさ」とは、携帯端末が移動する周期や移動量の大きさを表すものとする。 It should be noted that “the magnitude of movement” described above and below represents the period of movement of the mobile terminal and the magnitude of the movement amount.
 (表示レート変更処理の変形例)
 図5は、表示レート変更処理の流れの他の一例を示すフローチャートである。なお、図中のS24およびS26に記載の「表示レートを低下させる」という処理については、表示レートの低下割合が、S24>S26>0(表示レート変更なし、S28)であることとする。以降の図面においても、「表示レートを低下させる」という処理ブロックについては、語尾に付した数字が大きくなるほど、表示レートの低下割合が小さくなるものとする。
(Modification of display rate change processing)
FIG. 5 is a flowchart showing another example of the flow of the display rate changing process. In the process of “decreasing the display rate” described in S24 and S26 in the figure, the display rate reduction rate is S24>S26> 0 (no change in display rate, S28). Also in the subsequent drawings, regarding the processing block “decrease the display rate”, it is assumed that the rate of decrease in the display rate decreases as the number attached to the end of the processing block increases.
 携帯端末1の表示パネル30が画像の表示を開始すると、状態判定回路40は携帯端末1の状態判定を開始する。なお、図5の例では、状態判定回路40は3段階(移動大の状態、移動小の状態、ならびに静止状態)で移動の大きさを検出することとする。検出された移動状態は、表示データ送信回路12及び表示パネル駆動回路20で構成される表示レート変更回路に通知される。 When the display panel 30 of the mobile terminal 1 starts displaying an image, the state determination circuit 40 starts determining the state of the mobile terminal 1. In the example of FIG. 5, the state determination circuit 40 detects the magnitude of movement in three stages (large movement state, small movement state, and stationary state). The detected movement state is notified to a display rate changing circuit composed of the display data transmitting circuit 12 and the display panel driving circuit 20.
 状態判定回路40は携帯端末1の移動の大きさを判定する(S20およびS22)。移動大の場合(S20でYES)、表示レート変更回路は、表示レートを携帯端末1が静止状態である場合よりも低く、且つ最も低下させる(S24)。 The state determination circuit 40 determines the magnitude of movement of the mobile terminal 1 (S20 and S22). In the case of large movement (YES in S20), the display rate changing circuit lowers the display rate to the lowest level when the mobile terminal 1 is in a stationary state (S24).
 一方、状態判定回路40が移動小と判定した場合(S20でNOかつS22でYES)、状態情報を受信した表示レート変更回路は、表示データ11の表示レートをS24よりも小さい割合で低下させる(S26)。また、状態判定回路40が静止状態と判定した場合(S20でNOかつS22でNO)、状態情報を受信した表示レート変更回路は、表示データ11の表示データを変更させない(S28)。この場合、表示データ送信回路12による転送レート、表示パネル駆動回路20によるリフレッシュレートは何れも携帯端末1が静止状態の状態が維持されるため、表示品質の低下は生じない。 On the other hand, when the state determination circuit 40 determines that the movement is small (NO in S20 and YES in S22), the display rate changing circuit that has received the state information decreases the display rate of the display data 11 at a rate smaller than S24 ( S26). When the state determination circuit 40 determines that the state is stationary (NO in S20 and NO in S22), the display rate changing circuit that has received the state information does not change the display data of the display data 11 (S28). In this case, both the transfer rate by the display data transmission circuit 12 and the refresh rate by the display panel drive circuit 20 maintain the stationary state of the portable terminal 1, so that the display quality does not deteriorate.
 以上の処理によると、携帯端末1の移動の大きさに応じて段階的に表示レートを変更することができるため、表示品質の変化をより目立たなくすることができる。例えば、携帯端末1が大きく動いている場合、すなわち画像がより見づらく、表示品質の劣化もユーザにより知覚されにくい場合は表示レートを大きく低下させることで消費電力をより削減することができる。また、携帯端末1が動いてはいるが動きが小さい場合、すなわち大きく動いている場合に比べ表示品質の劣化がユーザに知覚され易い場合は、表示レートの低下の割合を抑えることにより、消費電力の低下と、ユーザの知覚する表示品質との両立を図ることができる。 According to the above processing, the display rate can be changed stepwise according to the magnitude of movement of the mobile terminal 1, so that the change in display quality can be made less noticeable. For example, when the mobile terminal 1 is moving greatly, that is, when the image is more difficult to see and display quality deterioration is difficult to be perceived by the user, the power consumption can be further reduced by greatly reducing the display rate. Further, when the mobile terminal 1 is moving but the movement is small, that is, when it is easy for the user to perceive the deterioration of the display quality as compared with the case where the mobile terminal 1 is moving greatly, the power consumption can be reduced by suppressing the rate of decrease in the display rate. And the display quality perceived by the user can be achieved at the same time.
 上記の移動の大きさの段階数、表示レートの段階数は任意に設定してもよい。この場合、移動を無段階に検出して、表示レートを連続的に変更することも可能である。 The number of steps of the above movement size and the number of steps of the display rate may be arbitrarily set. In this case, it is also possible to detect the movement steplessly and change the display rate continuously.
 図5に示す表示レート変更処理において、表示レートを下げる処理は、図3に示すように、転送レートを下げて、これに連動するようにリフレッシュレートを下げるようにしてもよい。また、図4に示すように、転送レートを下げずに一定にして、リフレッシュレートのみを下げるようにしてもよい。 In the display rate changing process shown in FIG. 5, the process of lowering the display rate may lower the transfer rate as shown in FIG. 3, and lower the refresh rate in conjunction with this. Further, as shown in FIG. 4, the transfer rate may be kept constant without being lowered, and only the refresh rate may be lowered.
 ここで、リフレッシュレートのみ下げる処理は、通常のプロセッサの表示処理を変更する必要が無いという点で、実現が簡単である。従って、携帯端末における消費電力の内、プロセッサの表示処理に関する電力が少ないもの、言い換えれば、プロセッサの表示処理が、比較的軽いシステム(単純な携帯端末等)に適している。 Here, the process of reducing only the refresh rate is easy to implement in that there is no need to change the normal processor display process. Therefore, among the power consumption of the portable terminal, the power consumption related to the display process of the processor is small, in other words, the display process of the processor is suitable for a relatively light system (simple portable terminal or the like).
 一方、昨今の高解像度の表示デバイスを持つスマートフォン等の携帯端末は、プロセッサの表示処理の消費電力がとても大きく、端末自体の電池持ちに関して、多大な影響を及ぼす。このような複雑な端末は、可能な限り、転送レート自体も下げる処理が望ましい。つまり、転送レートを下げれば、プロセッサ内部の、画像処理に関する他の部分(表示データ送信回路12だけでない回路、例えばメモリ、ビデオデコーダ、DMA等)の消費電力自体も一緒に下がる。 On the other hand, a mobile terminal such as a smartphone having a display device with a high resolution these days has a large power consumption for display processing of the processor, and has a great influence on the battery life of the terminal itself. For such a complicated terminal, it is desirable to reduce the transfer rate itself as much as possible. In other words, if the transfer rate is lowered, the power consumption itself of other parts related to image processing (circuits other than the display data transmission circuit 12, such as memory, video decoder, DMA, etc.) within the processor is also lowered.
 〔実施形態2〕
 本発明に係る携帯端末は、表示データ11が動画であるか否かを検知し、当該検知結果に応じて表示レートの低下割合を決定してもよい。以下、本発明の第2の実施形態について図6~7を用いて説明する。なお、説明の便宜上、前記実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。以下の各実施形態でも同様である。また、本実施形態では、実施形態1で図3を用いて説明したように、表示データ送信回路12が表示データ11の転送レートを変更することで、間接的にリフレッシュレートを変更する表示レート変更方法について説明する。しかしながら、本実施形態に係る携帯端末2においても、実施形態1で図4を用いて説明したように、表示パネル駆動回路20が自律的にリフレッシュレートを変更することとしてもよい。これは、以下の各実施形態についても同様である。
[Embodiment 2]
The mobile terminal according to the present invention may detect whether or not the display data 11 is a moving image, and may determine the rate of decrease in the display rate according to the detection result. Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. For convenience of explanation, members having the same functions as those described in the embodiment are given the same reference numerals, and descriptions thereof are omitted. The same applies to the following embodiments. In the present embodiment, as described with reference to FIG. 3 in the first embodiment, the display data transmission circuit 12 changes the transfer rate of the display data 11 to indirectly change the refresh rate. A method will be described. However, also in the portable terminal 2 according to the present embodiment, the display panel drive circuit 20 may autonomously change the refresh rate, as described with reference to FIG. 4 in the first embodiment. The same applies to the following embodiments.
 (携帯端末)
 図6は、本実施形態に係る携帯端末2の要部構成を示すブロック図である。携帯端末2は、ホストプロセッサ50を設ける点において、携帯端末1と異なっている。
(Mobile device)
FIG. 6 is a block diagram illustrating a main configuration of the mobile terminal 2 according to the present embodiment. The portable terminal 2 is different from the portable terminal 1 in that a host processor 50 is provided.
 ホストプロセッサ50は、表示データ11と動画検知回路51と、表示データ送信回路(転送レート決定回路)52とを含む。動画検知回路51は、表示データ11が動画であるか否かを検知する回路である。動画検知回路51は、表示データ送信回路52が転送する表示データ11が動画であるか否かを検出し、検出結果を動画検知情報として表示データ送信回路52に通知する。なお、動画検知回路51は表示データ11が動画である場合のみ動画検知情報を表示データ送信回路52に送信してもよい。 The host processor 50 includes display data 11, a moving image detection circuit 51, and a display data transmission circuit (transfer rate determination circuit) 52. The moving image detection circuit 51 is a circuit that detects whether or not the display data 11 is a moving image. The moving image detection circuit 51 detects whether or not the display data 11 transferred by the display data transmission circuit 52 is a moving image, and notifies the display data transmission circuit 52 of the detection result as moving image detection information. The moving image detection circuit 51 may transmit the moving image detection information to the display data transmission circuit 52 only when the display data 11 is a moving image.
 表示データ送信回路52は、動画検知情報と、状態情報とから、表示データ11の転送レートを決定し、当該転送レートで表示データ11を表示パネル駆動回路20に送信する。具体的には、表示データ送信回路52は、動画検知情報を参照し、表示データ11が動画である場合は、動画でない場合に比べて表示データ11の転送レートの低下割合を大きくする。また、表示データ送信回路52は、動画検知情報を参照し、表示データ11が動画である場合は、携帯端末2が静止状態であっても表示データ11の転送レートを低下させてもよい。 The display data transmission circuit 52 determines the transfer rate of the display data 11 from the moving image detection information and the status information, and transmits the display data 11 to the display panel drive circuit 20 at the transfer rate. Specifically, the display data transmission circuit 52 refers to the moving image detection information, and increases the rate of decrease in the transfer rate of the display data 11 when the display data 11 is a moving image compared to when it is not a moving image. Further, the display data transmission circuit 52 refers to the moving image detection information, and when the display data 11 is a moving image, the transfer rate of the display data 11 may be reduced even when the mobile terminal 2 is in a stationary state.
 なお、表示パネル駆動回路20が自律的にリフレッシュレートを決定する場合、表示データ送信回路52は表示パネル駆動回路20に対し動画検知情報を送信し、表示パネル駆動回路20が動画検知情報と状態情報とからリフレッシュレートを決定すればよい。リフレッシュレートの決定に係る判定は、上述した転送レートの決定に係る判定と同様である。 When the display panel driving circuit 20 autonomously determines the refresh rate, the display data transmission circuit 52 transmits moving image detection information to the display panel driving circuit 20, and the display panel driving circuit 20 moves the moving image detection information and status information. The refresh rate can be determined from the above. The determination related to the determination of the refresh rate is the same as the determination related to the determination of the transfer rate described above.
 このように、表示データが 動画の場合(後述するCABCの制御の場合も)は、表示レートを下げる場合、リフレッシュレートを下げるというよりは、動画の圧縮率を上げて、すなわち動画の一枚一枚の品質を下げて総合的にデータ量を減らして、パネル駆動回路20に転送することを示す。ここで、転送レートは転送量/時間と定義する。従って、総合的にデータ量を減らすことで、転送レートが下がる。以下、動画検知を考慮した表示レート変更処理について説明する。 As described above, when the display data is a moving image (also in the case of CABC control described later), when the display rate is lowered, the moving image compression rate is increased rather than the refresh rate is lowered, that is, each moving image is changed. It shows that the data quality is reduced by reducing the quality of the sheet and transferred to the panel drive circuit 20. Here, the transfer rate is defined as transfer amount / time. Therefore, the transfer rate is lowered by reducing the data amount comprehensively. Hereinafter, the display rate changing process considering moving image detection will be described.
 (表示レート変更処理の概要説明)
 図7は、携帯端末2における表示レート変更処理の流れの一例を示すフローチャートである。携帯端末2の表示パネル30が表示データ11の表示を開始すると、状態判定回路40は携帯端末2の状態判定を開始する。また、動画検知回路51は表示データ11が動画であるか否かを検出し、動画検知情報として表示データ送信回路52に通知する。なお、図7の例でも図5の例と同様、状態判定回路40は3段階(移動大、移動小、移動無し)で移動の有無および大きさを判定することとする。
(Overview of display rate change processing)
FIG. 7 is a flowchart illustrating an example of the flow of the display rate change process in the mobile terminal 2. When the display panel 30 of the portable terminal 2 starts displaying the display data 11, the state determination circuit 40 starts determining the state of the portable terminal 2. In addition, the moving image detection circuit 51 detects whether or not the display data 11 is a moving image, and notifies the display data transmission circuit 52 as moving image detection information. In the example of FIG. 7, as in the example of FIG. 5, the state determination circuit 40 determines the presence / absence and size of movement in three stages (large movement, small movement, no movement).
 表示データ送信回路52及び表示パネル駆動回路20で構成される表示レート変更回路は状態情報および動画検知情報を受信する。状態情報が示す移動の大きさが移動大である場合(S30でYES)、表示データ送信回路52は動画検知情報から表示データ11が動画であるか否かを確認する(S34)。状態情報が示す移動の大きさが移動小である場合(S30でNOかつS32でYES)、状態情報が静止状態を示す場合(S30でNOかつS32でNO)も、同様に動画検知情報から表示データ11が動画であるか否かを確認する(S36およびS38)。そして、表示レート変更回路は、携帯端末2の移動の大きさおよび表示データ11が動画であるか否かの2つの条件から、表示レートを決定する。 The display rate changing circuit composed of the display data transmitting circuit 52 and the display panel driving circuit 20 receives the state information and the moving image detection information. If the amount of movement indicated by the status information is large (YES in S30), the display data transmission circuit 52 confirms from the moving image detection information whether the display data 11 is a moving image (S34). When the magnitude of movement indicated by the state information is small movement (NO at S30 and YES at S32), and when the state information indicates a stationary state (NO at S30 and NO at S32), display is similarly performed from the moving image detection information. It is confirmed whether or not the data 11 is a moving image (S36 and S38). Then, the display rate changing circuit determines the display rate from the two conditions of the magnitude of movement of the mobile terminal 2 and whether or not the display data 11 is a moving image.
 具体的には、表示レート変更回路は、携帯端末2の移動が大であり、かつ表示データ11が動画である場合(S30でYESかつS34でYES)、表示レートを最も大幅に低下させる(S40)。一方、表示レート変更回路は、携帯端末2の移動が大であるが、表示データ11が動画でない場合(S30でYESかつS34でNO)の場合、S40に次ぐ割合で表示レートを低下させる(S42)。携帯端末2の移動小である場合も同様に、表示レート変更回路は、携帯端末2の移動の大きさが同じであるときは、表示データ11が動画である場合(S36でYES)に、表示データ11が動画でない場合(S36でNO)よりも大幅に表示レートを低下させる(S44および46)。 Specifically, the display rate changing circuit reduces the display rate most significantly when the movement of the mobile terminal 2 is large and the display data 11 is a moving image (YES in S30 and YES in S34) (S40). ). On the other hand, the display rate changing circuit reduces the display rate at a rate next to S40 when the movement of the portable terminal 2 is large but the display data 11 is not a moving image (YES in S30 and NO in S34) (S42). ). Similarly, when the movement of the portable terminal 2 is small, the display rate change circuit displays the display data 11 when the movement of the portable terminal 2 is the same when the display data 11 is a moving image (YES in S36). The display rate is significantly reduced (S44 and 46) than when the data 11 is not a moving image (NO in S36).
 さらに、携帯端末2が静止状態の場合(S30でNOかつS32でNO)、表示レート変更回路は、表示データ11が動画である場合(S38でYES)、表示レートを低下させる(S48)。一方、携帯端末2が静止状態で、かつ表示データ11が動画でない場合(S38NO)、表示レート変更回路はリフレッシュレートを変更させない(S50)。この場合、表示データ送信回路12による転送レート、表示パネル駆動回路20によるリフレッシュレートは何れも携帯端末1が静止状態の状態が維持されるため、表示品質の低下は生じない。 Furthermore, when the mobile terminal 2 is in a stationary state (NO in S30 and NO in S32), the display rate changing circuit reduces the display rate when the display data 11 is a moving image (YES in S38) (S48). On the other hand, when the mobile terminal 2 is stationary and the display data 11 is not a moving image (NO in S38), the display rate changing circuit does not change the refresh rate (S50). In this case, both the transfer rate by the display data transmission circuit 12 and the refresh rate by the display panel drive circuit 20 maintain the stationary state of the portable terminal 1, so that the display quality does not deteriorate.
 (効果)
 表示データ11が動画である場合、静止画に比べユーザは各画像(動画の1フレームにあたる画像)を詳細に認識することは難しい。換言すると、画像データの表示品質を多少低下させたところで、そのことはユーザに知覚されにくいといえる。例えば、一枚一枚のオリジナル画像データサイズがFHDだったとしても、動画連続視聴なら、HDサイズに落としても、知覚されにくい。そのため、上述の表示レート変更処理によると、携帯端末2は、表示データ11が動画である場合に、動画でない場合に比べより表示レートを低下させる。これにより、動画の表示品質の低下がユーザに知覚され難い状況下で、より消費電力を削減させることができるという効果を奏する。
(effect)
When the display data 11 is a moving image, it is difficult for the user to recognize in detail each image (an image corresponding to one frame of the moving image) compared to a still image. In other words, when the display quality of the image data is somewhat lowered, it can be said that this is difficult for the user to perceive. For example, even if the size of each original image data is FHD, even if the video is continuously viewed, it is difficult to perceive even if it is reduced to the HD size. Therefore, according to the above-described display rate changing process, the mobile terminal 2 reduces the display rate more when the display data 11 is a moving image than when it is not a moving image. As a result, there is an effect that power consumption can be further reduced in a situation in which a decrease in the display quality of the moving image is difficult for the user to perceive.
 また、動画の場合、表示レートを低下させることは、動画の圧縮率を上げて転送するデータ量を減らすことになるので、データ転送にかかる消費電力を削減することができる。つまり、動画の場合、プロセッサ内部の、画像処理に関する他の部分(例えばメモリ、ビデオデコーダ、DMA等)の消費電力も、より削減することができる。 Also, in the case of moving images, reducing the display rate increases the moving image compression rate and reduces the amount of data to be transferred, so that it is possible to reduce power consumption for data transfer. That is, in the case of a moving image, the power consumption of other parts (for example, memory, video decoder, DMA, etc.) related to image processing inside the processor can be further reduced.
 〔実施形態3〕
 本発明に係る携帯端末はさらに、バックライト制御としてCABC(Contents Adaptive Backlight Control)を適用中か否かに応じて表示レートの低下割合を決定してもよい。以下、本発明の第3の実施形態について、図8~9を用いて説明する。
[Embodiment 3]
The portable terminal according to the present invention may further determine the rate of decrease in the display rate depending on whether CABC (Contents Adaptive Backlight Control) is being applied as backlight control. Hereinafter, a third embodiment of the present invention will be described with reference to FIGS.
 (携帯端末)
 図8は、本実施形態に係る携帯端末3の要部構成を示すブロック図である。携帯端末3は、ホストプロセッサ60とバックライト70とを含んでいる。
(Mobile device)
FIG. 8 is a block diagram illustrating a main configuration of the mobile terminal 3 according to the present embodiment. The mobile terminal 3 includes a host processor 60 and a backlight 70.
 ホストプロセッサ60は、ホストプロセッサ50にCABC制御回路(バックライト制御回路)61を追加し、表示データ送信回路(転送レート決定回路)52を、表示データ送信回路(転送レート決定回路)62に変更した構成である。以下、当該追加・変更した構成について説明する。なお、表示データ送信回路62については、表示データ送信回路52との相違点についてのみ説明する。 The host processor 60 adds a CABC control circuit (backlight control circuit) 61 to the host processor 50, and changes the display data transmission circuit (transfer rate determination circuit) 52 to a display data transmission circuit (transfer rate determination circuit) 62. It is a configuration. Hereinafter, the added / modified configuration will be described. The display data transmission circuit 62 will be described only with respect to differences from the display data transmission circuit 52.
 CABC制御回路61は、表示データ送信回路62が転送する表示データ11の最大輝度値が、表示パネル30が表現できる最大輝度値になるように、表示データ11を変換する(表示データ11の階調分布を正規化する)回路である。CABC制御回路61は、表示データ送信回路62が取得した表示データ11を受け取り、正規化して表示データ送信回路62に返す。本実施形態において表示データ送信回路62は、この正規化された表示データ11を、表示パネル駆動回路20に転送する。 The CABC control circuit 61 converts the display data 11 so that the maximum luminance value of the display data 11 transferred by the display data transmission circuit 62 becomes the maximum luminance value that can be expressed by the display panel 30 (the gradation of the display data 11). This circuit normalizes the distribution. The CABC control circuit 61 receives the display data 11 acquired by the display data transmission circuit 62, normalizes it, and returns it to the display data transmission circuit 62. In the present embodiment, the display data transmission circuit 62 transfers the normalized display data 11 to the display panel drive circuit 20.
 バックライト70は、表示パネル30のバックライトであり、CABC制御回路61から受信するCABC制御情報に応じて輝度を変更する。 The backlight 70 is a backlight of the display panel 30 and changes the luminance according to the CABC control information received from the CABC control circuit 61.
 表示データ送信回路62は、動画検知情報と、CABC制御回路61から受信した、CABC適用中であるか否かを示す情報と、状態情報とから、表示データ11の転送レートを決定し、当該転送レートで表示データ11を表示パネル駆動回路20に送信する。 The display data transmission circuit 62 determines the transfer rate of the display data 11 from the moving image detection information, the information received from the CABC control circuit 61 indicating whether or not CABC is being applied, and the status information, and the transfer The display data 11 is transmitted to the display panel drive circuit 20 at a rate.
 なお、表示パネル駆動回路20が自律的にリフレッシュレートを決定する場合、表示データ送信回路52は表示パネル駆動回路20に対し動画検知情報と、CABC適用中であるか否かを示す情報とを送信し、表示パネル駆動回路20が動画検知情報と、CABC適用中であるか否かを示す情報と、状態情報とからリフレッシュレートを決定すればよい。以下、CABC制御を考慮した表示レート変更処理について説明する。 When the display panel drive circuit 20 autonomously determines the refresh rate, the display data transmission circuit 52 transmits moving image detection information and information indicating whether CABC is being applied to the display panel drive circuit 20. The refresh rate may be determined from the moving image detection information, information indicating whether CABC is being applied, and the state information. Hereinafter, the display rate changing process in consideration of CABC control will be described.
 (表示レート変更処理の概要説明)
 図9は、携帯端末3における表示レート変更処理の流れの一例を示すフローチャートである。なお、図9のS124以降の処理は、図7に示すフローチャートと同様であるので、説明を省略する。また、図9のS102~120の処理も、図7のS30~S48の処理と同様であるため、説明を省略する。
(Overview of display rate change processing)
FIG. 9 is a flowchart illustrating an example of the flow of the display rate change process in the mobile terminal 3. Note that the processing after S124 in FIG. 9 is the same as that in the flowchart shown in FIG. Also, the processing in S102 to S120 in FIG. 9 is the same as the processing in S30 to S48 in FIG.
 本実施形態に係る表示レート変更処理では、携帯端末3の表示パネル30が表示データ11の表示を開始すると、CABC制御回路61、表示データ送信回路62に対しCABCを適用中であるか否かを示す情報を通知する。表示データ送信回路62及び表示パネル駆動回路20で構成される表示レート変更回路は当該通知を参照し、CABCが適用中の場合(S100でYES)、CABCが適用中でない場合(S100でNO)に比べ大幅にリ表示レートを低下させる(S112~122)。さらに、CABCが適用中の場合(S100でYES)、携帯端末3が静止状態であり(S102でNOかつS104でNO)、表示データ11が動画でない場合(S110でNO)でも、表示データ送信回路62は表示レートを低下させる(S122)。 In the display rate changing process according to the present embodiment, when the display panel 30 of the mobile terminal 3 starts displaying the display data 11, whether or not CABC is being applied to the CABC control circuit 61 and the display data transmission circuit 62 is determined. Notify the information shown. The display rate changing circuit configured by the display data transmission circuit 62 and the display panel driving circuit 20 refers to the notification, and when CABC is being applied (YES in S100) or when CABC is not being applied (NO in S100). In comparison, the redisplay rate is greatly reduced (S112 to 122). Further, even when CABC is being applied (YES in S100), the mobile terminal 3 is stationary (NO in S102 and NO in S104), and even when the display data 11 is not a moving image (NO in S110), the display data transmission circuit 62 reduces the display rate (S122).
 (効果)
 一般的に、表示パネル30にCABCを適用している時は、バックライト70の輝度を低下させることができるので消費電力は下がるが、表示データ11の正規化により表示品質も低下する。したがって、CABCを適用させている場合というのは、多少表示品質が低下したとしても、視聴に影響の無い状況である、またはユーザが視聴において表示品質を重要視していない状況であるといえる。したがって、上述の表示レート変更処理のように、CABC適用時に、より表示レートを低下させることとすることで、表示データ11の表示品質の低下が問題にならない状況下で、より消費電力を削減することができるという効果を奏する。
(effect)
In general, when CABC is applied to the display panel 30, the luminance of the backlight 70 can be reduced, so that power consumption is reduced, but display quality is also reduced by normalization of the display data 11. Therefore, it can be said that the case where CABC is applied is a situation in which viewing quality is not affected even when the display quality is somewhat lowered, or the user does not place importance on display quality in viewing. Therefore, as in the display rate changing process described above, by reducing the display rate when CABC is applied, the power consumption can be further reduced in a situation where the display quality of the display data 11 does not deteriorate. There is an effect that can be.
 なお、前記実施形態1~3では、表示レートを低下させる例として、転送レートを下げて、リフレッシュレートを下げる例と、転送レートを下げずに一定にして、リフレッシュレートを下げる例について説明しているが、これらに限定されるものではない。例えば、リフレッシュレートを下げずに一定にして、転送レートのみを下げるようにしてもよい。この場合、特に、表示パネル30側においてリフレッシュレートを下げることができない場合(一般的な液晶表示パネルでの最低リフレッシュレートは60fpsであり、これ以上下げるとチラツキなどが発生し、表示品質が低下する。)に、転送レートのみを低下させることで、液晶表示パネルの表示品質を低下させることができるため、有効である。 In the first to third embodiments, as an example of reducing the display rate, an example in which the transfer rate is lowered and the refresh rate is lowered, and an example in which the refresh rate is lowered without lowering the transfer rate are described. However, it is not limited to these. For example, the transfer rate may be lowered by keeping it constant without lowering the refresh rate. In this case, in particular, when the refresh rate cannot be lowered on the display panel 30 side (the minimum refresh rate in a general liquid crystal display panel is 60 fps, and if it is further reduced, flickering occurs and display quality deteriorates. )), It is effective to reduce the display quality of the liquid crystal display panel by reducing only the transfer rate.
 〔ソフトウェアによる実現例〕
 携帯端末1~3の制御ブロック(特に表示データ送信回路12、52、および62、動画検知回路51、ならびにCABC制御回路61)は、集積回路(ICチップ)等に形成された論理回路(ハードウェア)によって実現してもよいし、CPU(Central Processing Unit)を用いてソフトウェアによって実現してもよい。
[Example of software implementation]
The control blocks (particularly the display data transmission circuits 12, 52 and 62, the moving image detection circuit 51, and the CABC control circuit 61) of the portable terminals 1 to 3 are logic circuits (hardware) formed in an integrated circuit (IC chip) or the like. ) Or by software using a CPU (Central Processing Unit).
 後者の場合、携帯端末1~3は、各機能を実現するソフトウェアであるプログラムの命令を実行するCPU、上記プログラムおよび各種データがコンピュータ(またはCPU)で読み取り可能に記録されたROM(Read Only Memory)または記憶装置(これらを「記録媒体」と称する)、上記プログラムを展開するRAM(Random Access Memory)などを備えている。そして、コンピュータ(またはCPU)が上記プログラムを上記記録媒体から読み取って実行することにより、本発明の目的が達成される。上記記録媒体としては、「一時的でない有形の媒体」、例えば、テープ、ディスク、カード、半導体メモリ、プログラマブルな論理回路などを用いることができる。また、上記プログラムは、該プログラムを伝送可能な任意の伝送媒体(通信ネットワークや放送波等)を介して上記コンピュータに供給されてもよい。なお、本発明は、上記プログラムが電子的な伝送によって具現化された、搬送波に埋め込まれたデータ信号の形態でも実現され得る。 In the latter case, the mobile terminals 1 to 3 include a CPU that executes instructions of a program that is software that realizes each function, and a ROM (Read Only Memory) in which the program and various data are recorded so as to be readable by the computer (or CPU). ) Or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) that expands the program, and the like. And the objective of this invention is achieved when a computer (or CPU) reads the said program from the said recording medium and runs it. As the recording medium, a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used. The program may be supplied to the computer via an arbitrary transmission medium (such as a communication network or a broadcast wave) that can transmit the program. The present invention can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
 〔まとめ〕
 本発明の態様1に係る表示制御装置(ホストプロセッサ10、50、60)は、画像データ(表示データ11)を表示する表示装置(表示パネル30)が移動状態および静止状態のいずれであるかを判定する状態判定回路40と、上記状態判定回路の判定結果に応じて、上記画像データの上記表示装置への転送レートまたは上記画像データの上記表示装置でのリフレッシュレートを変更する表示レート変更回路(表示データ送信回路12、52、62、表示パネル駆動回路20)と、を備え、上記表示レート変更回路(表示データ送信回路12、52、62、表示パネル駆動回路20)は、上記状態判定回路40により上記表示装置(表示パネル30)が移動状態であると判定された場合に、上記静止状態と判定された場合よりも上記転送レートまたは上記リフレッシュレートを低下させることを特徴としている。
[Summary]
The display control device (host processor 10, 50, 60) according to aspect 1 of the present invention determines whether the display device (display panel 30) that displays the image data (display data 11) is in the moving state or the stationary state. A state determination circuit 40 for determining and a display rate changing circuit for changing a transfer rate of the image data to the display device or a refresh rate of the image data on the display device according to a determination result of the state determination circuit ( Display data transmission circuits 12, 52, 62, and display panel drive circuit 20), and the display rate changing circuit (display data transmission circuits 12, 52, 62, display panel drive circuit 20) includes the state determination circuit 40. Therefore, when the display device (display panel 30) is determined to be in the moving state, the transfer rate is higher than when the display device (display panel 30) is determined to be in the stationary state. It is characterized by lowering the object or the refresh rate.
 上記構成によれば、表示装置が移動状態の場合、すなわち、表示装置自体または表示装置を持つユーザが動いていて、表示装置に表示した画像が見えにくいと推定される場合は、表示装置に高精細な画像を表示してもユーザが当該画像を確実に認識することは難しい。換言すると、画像の表示品質を多少落としたとしても、ユーザは表示品質の劣化に気付きにくい。 According to the above configuration, when the display device is in a moving state, that is, when it is estimated that the display device itself or a user having the display device is moving and it is difficult to see the image displayed on the display device, the display device is Even if a fine image is displayed, it is difficult for the user to reliably recognize the image. In other words, even if the display quality of the image is somewhat reduced, the user is less likely to notice the deterioration of the display quality.
 したがって、上記の構成によると、表示装置が移動状態の場合に、静止状態と判定された場合よりも画像データの表示装置への転送レートまたは画像データの表示装置でのリフレッシュレートを低下させれば、ユーザが表示品質の劣化に気付きにくいような表示装置の使用環境下において、画像の表示に係る消費電力を削減することができる。したがって、ユーザが当該画像データを視認するのに影響を及ぼさない程度の表示品質を確保することと、消費電力の削減とを両立させることができる。 Therefore, according to the above configuration, when the display device is in the moving state, if the transfer rate of the image data to the display device or the refresh rate of the image data on the display device is lowered as compared with the case where the display device is determined to be stationary. Thus, it is possible to reduce power consumption related to image display under the usage environment of the display device in which the user is less likely to notice deterioration in display quality. Therefore, it is possible to achieve both of ensuring display quality that does not affect the user's viewing of the image data and reducing power consumption.
 しかも、画像データの表示転送レートまたは画像データの表示装置でのリフレッシュレートをリアルタイムに変更するため、複数の転送レートまたは複数のリフレッシュレートで表示する場合の画像データを予め記憶しておく必要がない。そのため、画像データを記憶する記憶部の容量が少なくて済む。したがって、記憶部の容量増加に伴う装置の大型化を招くことを防ぎつつ、画像データを表示装置の使用環境に応じた転送レートまたはリフレッシュレートで表示させることができるという効果を奏する。 In addition, since the display transfer rate of image data or the refresh rate of the image data on the display device is changed in real time, it is not necessary to previously store image data for display at a plurality of transfer rates or a plurality of refresh rates. . For this reason, the capacity of the storage unit for storing image data can be reduced. Therefore, it is possible to display the image data at a transfer rate or a refresh rate according to the use environment of the display device while preventing an increase in size of the device due to an increase in the capacity of the storage unit.
 本発明の態様2に係る表示制御装置は、上記態様1において、上記状態判定回路は、上記移動状態における上記表示装置の移動の大きさを段階的に判定し、上記表示レート変更回路は、上記表示装置の移動の大きさに応じて、上記転送レートまたは上記リフレッシュレートを変更することを特徴としている。 The display control device according to aspect 2 of the present invention is the display control device according to aspect 1, wherein the state determination circuit determines the magnitude of movement of the display device in the moving state in a stepwise manner, and the display rate changing circuit is The transfer rate or the refresh rate is changed according to the amount of movement of the display device.
 上記の構成によれば、表示装置の移動の大きさに応じて段階的に転送レートまたはリフレッシュレートを変更することができるため、表示品質の変化をより目立たなくすることができる。例えば、表示装置が大きく動いている場合、すなわち画像がより見づらく、表示品質の劣化もユーザにより知覚されにくい場合は転送レートまたはリフレッシュレートを大きく低下させることで消費電力をより削減することができる。また例えば、表示装置が動いてはいるが動きが小さい場合、すなわち大きく動いている場合に比べ表示品質の劣化がユーザに知覚され易い場合は、転送レートまたはリフレッシュレートの低下の割合を抑えることにより、消費電力の低下と、ユーザの知覚する表示品質との両立を図ることができる。 According to the above configuration, the transfer rate or the refresh rate can be changed stepwise according to the movement of the display device, so that the change in display quality can be made less noticeable. For example, when the display device is moving greatly, that is, when it is difficult to see an image and display quality deterioration is difficult to be perceived by the user, the power consumption can be further reduced by greatly reducing the transfer rate or the refresh rate. Also, for example, when the display device is moving but the movement is small, that is, when it is easy for the user to perceive the deterioration in display quality compared to when the display device is moving greatly, by suppressing the rate of decrease in transfer rate or refresh rate Thus, it is possible to achieve both reduction in power consumption and display quality perceived by the user.
 本発明の態様3に係る表示制御装置は、上記態様1または2のいずれか一態様において、上記画像データが動画であるか否かを検知する動画検知回路(動画検知回路51)をさらに備え、上記表示レート変更回路は、上記状態判定回路の判定結果と、上記動画検知回路による検知結果とに応じて、上記転送レートまたは上記リフレッシュレートを変更することを特徴としている。 A display control device according to aspect 3 of the present invention further includes a moving image detection circuit (moving image detection circuit 51) for detecting whether or not the image data is a moving image in any one of the aspects 1 or 2. The display rate changing circuit is characterized in that the transfer rate or the refresh rate is changed in accordance with a determination result of the state determination circuit and a detection result of the moving image detection circuit.
 画像データが動画である場合、静止画である場合に比べて、ユーザは各画像(動画の1フレームにあたる画像)を詳細に認識することは難しい。換言すると、画像データの表示品質を多少低下させたところで、そのことはユーザに知覚されにくいといえる。そのため、上記の構成によると、画像データが動画であるか否かに応じて転送レートまたはリフレッシュレートを変更することにより、表示品質の低下と消費電力の削減とを両立させることができるという効果を奏する。 When the image data is a moving image, it is difficult for the user to recognize each image (an image corresponding to one frame of the moving image) in detail compared to a case where the image data is a still image. In other words, when the display quality of the image data is somewhat lowered, it can be said that this is difficult for the user to perceive. Therefore, according to the above configuration, by changing the transfer rate or the refresh rate according to whether the image data is a moving image, it is possible to achieve both a reduction in display quality and a reduction in power consumption. Play.
 本発明の態様4に係る表示制御装置は、上記態様1~3のいずれか一態様において、上記表示装置に表示させる画像データの特徴に応じて、上記表示装置のバックライトの輝度と表示する画像データの階調分布とを変化させるバックライト制御回路(CABC制御回路61)をさらに備え、上記表示レート変更回路は、上記バックライト制御回路によるバックライト制御が実行されているか否かに応じて、上記転送レートまたは上記リフレッシュレートを変更することを特徴としている。 The display control apparatus according to aspect 4 of the present invention is the display control apparatus according to any one of the aspects 1 to 3, wherein the backlight brightness of the display device and the image to be displayed are displayed according to the characteristics of the image data displayed on the display device. The display control circuit further includes a backlight control circuit (CABC control circuit 61) that changes the gradation distribution of data, and the display rate changing circuit depends on whether or not the backlight control by the backlight control circuit is executed. The transfer rate or the refresh rate is changed.
 一般的に、表示パネル30にバックライト制御(CABC)を適用している時は、消費電力は下がるが、画像データの階調分布を変化させる(正規化)ことにより表示品質も低下する。したがって、バックライト制御が実行されている場合というのは、画像データの表示品質が多少低下したとしても視聴に影響の無い状況である、またはユーザが視聴において表示品質を重要視していない状況であるといえる。 Generally, when backlight control (CABC) is applied to the display panel 30, the power consumption is reduced, but the display quality is also lowered by changing (normalizing) the gradation distribution of the image data. Therefore, the case where the backlight control is executed is a situation in which the viewing quality is not affected even if the display quality of the image data is slightly lowered, or the display quality is not considered important in the viewing. It can be said that there is.
 したがって、上記の構成によると、バックライト制御が実行される場合に、転送レートまたはリフレッシュレートをより変化させることで、画像データの表示品質の低下が問題にならない状況下で、より消費電力を削減することができる。 Therefore, according to the above configuration, when backlight control is executed, the transfer rate or refresh rate can be changed more to reduce power consumption in situations where degradation of the display quality of image data is not a problem. can do.
 本発明の態様5に係る表示システム(携帯端末1、2、または3)は、上記態様1~4のいずれか1態様に記載の表示制御装置と、上記表示制御装置からの制御に従って画像データを表示する表示装置(表示パネル30)とを含むことを特徴している。上記の構成によれば、態様1~4に係る表示制御装置と同様の効果を奏する。 A display system (portable terminal 1, 2 or 3) according to aspect 5 of the present invention provides a display control device according to any one of aspects 1 to 4 and image data according to control from the display control apparatus. And a display device (display panel 30) for display. According to said structure, there exists an effect similar to the display control apparatus which concerns on aspect 1-4.
 本発明の態様6に係る表示制御方法は、画像データを表示する表示装置が移動状態および静止状態のいずれであるかを判定する状態判定ステップ(S10)と、上記状態判定ステップにより移動状態であると判定された場合に、上記静止状態と判定された場合よりも上記画像データの上記表示装置への転送レートまたは上記画像データの上記表示装置でのリフレッシュレートを低下させる表示レート変更ステップ(S12)と、を含むことを特徴としている。上記の構成によれば、態様1に係る表示制御装置と同様の効果を奏する。 The display control method according to aspect 6 of the present invention is in the moving state by the state determining step (S10) for determining whether the display device that displays the image data is in the moving state or the stationary state, and the state determining step. A display rate changing step (S12) for lowering the transfer rate of the image data to the display device or the refresh rate of the image data on the display device than when determined to be the still state. It is characterized by including. According to said structure, there exists an effect similar to the display control apparatus which concerns on aspect 1. FIG.
 本発明は上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。さらに、各実施形態にそれぞれ開示された技術的手段を組み合わせることにより、新しい技術的特徴を形成することができる。 The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention. Furthermore, a new technical feature can be formed by combining the technical means disclosed in each embodiment.
 1、2、3 携帯端末(表示システム)、10、50、60 ホストプロセッサ、12、52、62(表示制御装置) 表示データ送信回路(転送レート決定回路、表示レート変更回路)、20 表示パネル駆動回路(リフレッシュレート変更回路、表示レート変更回路)、30 表示パネル(表示装置)、40 状態判定回路、51 動画検知回路、61 CABC制御回路(バックライト制御回路) 1, 2, 3 Mobile terminal (display system) 10, 50, 60 Host processor, 12, 52, 62 (display control device) Display data transmission circuit (transfer rate determination circuit, display rate change circuit), 20 display panel drive Circuit (refresh rate change circuit, display rate change circuit), 30 display panel (display device), 40 state determination circuit, 51 video detection circuit, 61 CABC control circuit (backlight control circuit)

Claims (6)

  1.  画像データを表示する表示装置が移動状態および静止状態のいずれであるかを判定する状態判定回路と、
     上記状態判定回路の判定結果に応じて、上記画像データの上記表示装置への転送レートまたは上記画像データの上記表示装置でのリフレッシュレートを変更する表示レート変更回路と、
    を備え、
     上記表示レート変更回路は、
     上記状態判定回路により上記表示装置が移動状態であると判定された場合に、上記静止状態と判定された場合よりも上記転送レートまたは上記リフレッシュレートを低下させることを特徴とする表示制御装置。
    A state determination circuit for determining whether the display device for displaying image data is in a moving state or a stationary state;
    A display rate changing circuit that changes a transfer rate of the image data to the display device or a refresh rate of the image data in the display device according to a determination result of the state determination circuit;
    With
    The display rate changing circuit is
    A display control device, wherein when the display device is determined to be in a moving state by the state determination circuit, the transfer rate or the refresh rate is lowered as compared with a case where the display device is determined to be in a stationary state.
  2.  上記状態判定回路は、上記移動状態における上記表示装置の移動の大きさを段階的に判定し、
     上記表示レート変更回路は、上記表示装置の移動の大きさに応じて、上記転送レートまたは上記リフレッシュレートを変更することを特徴とする請求項1に記載の表示制御装置。
    The state determination circuit determines stepwise the magnitude of movement of the display device in the moving state,
    The display control apparatus according to claim 1, wherein the display rate changing circuit changes the transfer rate or the refresh rate in accordance with a magnitude of movement of the display apparatus.
  3.  上記画像データが動画であるか否かを検知する動画検知回路をさらに備え、
     上記表示レート変更回路は、
     上記状態判定回路の判定結果と、上記動画検知回路による検知結果とに応じて、上記転送レートまたは上記リフレッシュレートを変更することを特徴とする、請求項1または2に記載の表示制御装置。
    A moving image detecting circuit for detecting whether the image data is a moving image;
    The display rate changing circuit is
    The display control apparatus according to claim 1, wherein the transfer rate or the refresh rate is changed according to a determination result of the state determination circuit and a detection result of the moving image detection circuit.
  4.  上記表示装置に表示させる画像データの特徴に応じて、上記表示装置のバックライトの輝度と表示する画像データの階調分布とを変化させるバックライト制御回路をさらに備え、
     上記表示レート変更回路は、
     上記バックライト制御回路によるバックライト制御が実行されているか否かに応じて、上記転送レートまたは上記リフレッシュレートを変更することを特徴とする、請求項1~3のいずれか1項に記載の表示制御装置。
    A backlight control circuit that changes the luminance of the backlight of the display device and the gradation distribution of the image data to be displayed according to the characteristics of the image data to be displayed on the display device;
    The display rate changing circuit is
    The display according to any one of claims 1 to 3, wherein the transfer rate or the refresh rate is changed according to whether or not backlight control by the backlight control circuit is executed. Control device.
  5.  画像データを表示する表示装置が移動状態および静止状態のいずれであるかを判定する状態判定ステップと、
     上記状態判定ステップにより移動状態であると判定された場合に、上記静止状態と判定された場合よりも上記画像データの上記表示装置への転送レートまたは上記画像データの上記表示装置でのリフレッシュレートを低下させる表示レート変更ステップと、を含むことを特徴とする表示制御方法。
    A state determination step of determining whether the display device displaying the image data is in a moving state or a stationary state;
    When it is determined in the state determination step that the mobile device is in the moving state, the transfer rate of the image data to the display device or the refresh rate of the image data on the display device is higher than that in the case of the determination of the stationary state. And a display rate changing step for reducing the display rate.
  6.  コンピュータに、
     画像データを表示する表示装置が移動状態および静止状態のいずれであるかを判定する状態判定手順と、
     上記状態判定手順により移動状態であると判定された場合に、上記静止状態と判定された場合よりも上記画像データの上記表示装置への転送レートまたは上記画像データの上記表示装置でのリフレッシュレートを低下させる表示レート変更手順とを実行させるためのプログラム。
    On the computer,
    A state determination procedure for determining whether the display device for displaying image data is in a moving state or a stationary state;
    When it is determined by the state determination procedure that the mobile device is in the moving state, the transfer rate of the image data to the display device or the refresh rate of the image data on the display device is higher than that in the case of determining the stationary state. A program for executing a display rate changing procedure for decreasing.
PCT/JP2017/004525 2016-02-22 2017-02-08 Display control device, display control method and program WO2017145753A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2018501551A JPWO2017145753A1 (en) 2016-02-22 2017-02-08 Display control apparatus, display control method, and program

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016-031446 2016-02-22
JP2016031446 2016-02-22

Publications (1)

Publication Number Publication Date
WO2017145753A1 true WO2017145753A1 (en) 2017-08-31

Family

ID=59686025

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2017/004525 WO2017145753A1 (en) 2016-02-22 2017-02-08 Display control device, display control method and program

Country Status (2)

Country Link
JP (1) JPWO2017145753A1 (en)
WO (1) WO2017145753A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112581874A (en) * 2019-09-29 2021-03-30 北京小米移动软件有限公司 Display panel, display device, display control method and device and terminal equipment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006084758A (en) * 2004-09-16 2006-03-30 Seiko Epson Corp Drive circuit and method for optoelectronic device, optoelectronic device, and electronic equipment
JP2009198595A (en) * 2008-02-19 2009-09-03 Casio Comput Co Ltd Active matrix type liquid crystal display
WO2015145541A1 (en) * 2014-03-24 2015-10-01 日立マクセル株式会社 Video display device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103576830A (en) * 2012-08-08 2014-02-12 联想(北京)有限公司 Terminal equipment and power consumption control method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006084758A (en) * 2004-09-16 2006-03-30 Seiko Epson Corp Drive circuit and method for optoelectronic device, optoelectronic device, and electronic equipment
JP2009198595A (en) * 2008-02-19 2009-09-03 Casio Comput Co Ltd Active matrix type liquid crystal display
WO2015145541A1 (en) * 2014-03-24 2015-10-01 日立マクセル株式会社 Video display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112581874A (en) * 2019-09-29 2021-03-30 北京小米移动软件有限公司 Display panel, display device, display control method and device and terminal equipment

Also Published As

Publication number Publication date
JPWO2017145753A1 (en) 2018-08-02

Similar Documents

Publication Publication Date Title
US8804048B2 (en) Motion-adaptive alternate gamma drive for LCD
WO2016157839A1 (en) Signal processing device, record/replay device, signal processing method, and program
US20090219441A1 (en) Information processing apparatus
WO2006112110A1 (en) Method for driving liquid crystal display apparatus
TWI402812B (en) Driving cricuit and gray insertion method of liquid crystal display
WO2010134358A1 (en) Image display device
JP4693918B2 (en) Image quality adjusting apparatus and image quality adjusting method
JP2011259050A (en) Hdmi connection device
US9135672B2 (en) Display system and data transmission method thereof
WO2017145753A1 (en) Display control device, display control method and program
JP2011160245A (en) Video viewing system, video display apparatus, and video recording media reproduction apparatus
US10506138B2 (en) Driving displays at cinematic frame rates
JP2017184220A (en) Video processing apparatus, display apparatus, video processing method, control program, and recording medium
WO2018109988A1 (en) Display device, display control method and program
US20080284785A1 (en) Dynamic data rate display
JP6479732B2 (en) Video processing apparatus, television receiver, video processing method, control program, and recording medium
JP6386636B2 (en) Display device, program, recording medium, television receiver, and display system
JP2014186275A (en) Display device, television receiver, and method of controlling display device
JP6102342B2 (en) Image processing device, display device, and image processing method
JP2019041329A (en) Video processing device, display device, video processing method, control program, and recording medium
WO2018042985A1 (en) Display device, program, recording medium, television receiver, and transmission device
JP2008010030A (en) Content reproducing device
JP6607948B2 (en) Transfer control device, terminal device, and transfer control method
JP5228530B2 (en) Image data distribution system, image data receiving device, and image data transmitting device
EP2312842B1 (en) Display apparatus and image playing method thereof

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2018501551

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 17756194

Country of ref document: EP

Kind code of ref document: A1

122 Ep: pct application non-entry in european phase

Ref document number: 17756194

Country of ref document: EP

Kind code of ref document: A1