WO2013035315A1 - Appareil d'affichage d'image et son procédé de commande - Google Patents

Appareil d'affichage d'image et son procédé de commande Download PDF

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Publication number
WO2013035315A1
WO2013035315A1 PCT/JP2012/005610 JP2012005610W WO2013035315A1 WO 2013035315 A1 WO2013035315 A1 WO 2013035315A1 JP 2012005610 W JP2012005610 W JP 2012005610W WO 2013035315 A1 WO2013035315 A1 WO 2013035315A1
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WO
WIPO (PCT)
Prior art keywords
image
luminance
light emission
frame
unit
Prior art date
Application number
PCT/JP2012/005610
Other languages
English (en)
Inventor
Yoshikazu Shibamiya
Chika Masuda
Atsushi Morita
Joji KAMAHARA
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Canon Kabushiki Kaisha
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
Priority claimed from JP2012181826A external-priority patent/JP6230218B2/ja
Priority claimed from JP2012191713A external-priority patent/JP6202793B2/ja
Application filed by Canon Kabushiki Kaisha filed Critical Canon Kabushiki Kaisha
Priority to US14/238,343 priority Critical patent/US9299297B2/en
Publication of WO2013035315A1 publication Critical patent/WO2013035315A1/fr

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control 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
    • G09G3/34—Control 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
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G09G3/3426—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines the different display panel areas being distributed in two dimensions, e.g. matrix
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/431—Generation of visual interfaces for content selection or interaction; Content or additional data rendering
    • H04N21/4318—Generation of visual interfaces for content selection or interaction; Content or additional data rendering by altering the content in the rendering process, e.g. blanking, blurring or masking an image region
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/435—Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
    • H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/83—Generation or processing of protective or descriptive data associated with content; Content structuring
    • H04N21/84—Generation or processing of descriptive data, e.g. content descriptors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/144—Movement detection

Definitions

  • the backlight is divided into a plurality of light source blocks.
  • the screen image is analyzed for each of areas (divided areas) on a liquid crystal panel corresponding to the light source blocks respectively.
  • the light emission is controlled for each of the light source blocks depending on the luminance (brightness) of the screen image to be displayed on each of the divided areas.
  • This technique is referred to as the local dimming (hereinafter abbreviated as "LD") control.
  • LD local dimming
  • the so-called delay time which is the time ranging from the input of the image data into the image display apparatus to the display on the liquid crystal panel.
  • the delay time is short.
  • FIG. 12 illustrates a video signal used in the third embodiment.
  • Fig. 13 illustrates the flow of the operation in the third embodiment.
  • Fig. 14 shows a block diagram in relation to a fourth embodiment.
  • Fig. 15 illustrates the flow of the operation in the fourth embodiment.
  • Figs. 16A, 16B, and 16C illustrate the division control for LD blocks in the fourth embodiment.
  • Figs. 17A and 17B illustrate the division control for LD blocks in the fourth embodiment.
  • Figs. 18A and 18B illustrate the division control for LD blocks in the fourth embodiment.
  • the LD luminance calculating unit 1107 does not complete the calculation of the LD luminance information LD2 with the second number of block divisions DIV2 in relation to the frame 1, the following operation is performed. That is, the LD luminance information holding unit 1108 outputs the holding LD luminance information LD0 to the luminance correcting unit 1102 and the backlight control unit 1111 during a period until the calculation of the LD luminance information LD2 with the second number of block divisions DIV 2 is completed.
  • the LD block variable control unit 1109 can change the number of block divisions as the number of LD blocks with which the backlight 1112 is divided. In other words, the LD block variable control unit 1109 performs the setting of the light emission control block or blocks so that one light source or the plurality of light sources are controlled with the common light emission luminance. In order to determine the initial value of the number of block divisions, the LD block variable control unit 1109 detects the frame cycle and the number of pixels of the video data S101 inputted from the video signal processing unit 1191.
  • the LD block variable control unit 1109 acquires, from the frame comparing unit 1106, the judgment result to show whether or not the frame image data of the present frame inputted from the video signal processing unit 1191 is identical with the frame image data of the previous frame inputted from the buffer unit 1101.
  • the LD block variable control unit 1109 judges whether or not the number of block divisions is required to be changed depending on the acquired judgment result. Specifically, the LD block variable control unit 1109 increases the number of block divisions if the present frame is identical with the previous frame. The LD block variable control unit 1109 does not change the number of block divisions if the present frame is different from the previous frame.
  • the LD block variable control unit 1109 acquires, from the LD luminance calculating unit 1107, the information of the number of LD blocks which are included in the LD blocks of the concerning frame and for which the calculation of the LD luminance has been completed, when one frame elapses after the start of the calculation of the LD luminance of the certain frame.
  • the LD block variable control unit 1109 corrects the number of block divisions, if necessary, on the basis of the number of block divisions table so that the calculation of the LD luminance can be completed with one remaining frame, depending on the number of LD blocks for which the calculation of the LD luminance is not completed yet when one frame elapses.
  • the maximum value which is assumed as the time required to complete the calculating process for the LD luminance, is t_2_Q. Details will be described later on.
  • the LD luminance information is inputted from the LD luminance information holding unit 1108 into the backlight control unit 1111.
  • the backlight control unit 1111 controls the light emission of the backlight 1112 for each of the LD blocks on the basis of the LD luminance information.
  • the backlight 1112 is arranged at the back surface of the display unit 1104.
  • the backlight 1112 is the direct type backlight in which LED is used as the light source (light-emitting element).
  • the light emission of each of the plurality of light source blocks for constructing the backlight 1112 is controlled independently by the backlight control unit 1111.
  • Each of the light source blocks is composed of one or more LEDs. LEDs, which belong to the identical light source block, are connected in series or in parallel, and LEDs emit the light in accordance with the identical control signal (for example, PWM signal having an identical cycle and an identical duty ratio).
  • the writing of the luminance data into LED is performed by means of the line scanning control having been hitherto known. In the line scanning, a plurality of lines can be simultaneously subjected to the scanning.
  • the LED writing time can be shortened by simultaneously scanning the plurality of lines.
  • the backlight 1112 is divided into 129600 light source blocks in total of 480 segments for the width (lateral dimension) and 270 lines for the height (longitudinal dimension).
  • the maximum value of the number of block divisions is the value of 129600 divisions of 480 for the width (lateral dimension) x 270 for the height (longitudinal dimension).
  • each of the LD blocks is composed of one light source block.
  • the video signal processing unit 1191 performs various types of image processing other than the LD control for the image display apparatus 11, including, for example, the synchronous control and the processes in relation to, for example, the luminance, the chromaticity, and the number of pixels of the video data.
  • the system control unit 1199 controls the operation of the entire image display apparatus 11 in an integrated manner.
  • the system control unit 1199 performs, for example, the control of the power source, the switching of the video signal, and the control of the process in response to the operation performed by a user.
  • the image display apparatus of this embodiment is operated such that the calculation of the LD luminance is completed within two frames with respect to the inputted frame, and the inputted frame is displayed on the display unit 1104 at the timing delayed by two frames.
  • Fig. 3 illustrates the timing of the LD control if the two continuous frames are not identical, i.e., if the inputted screen image is the moving image.
  • Fig. 3 shows an example of the case in which the delay from the input to the display is two frames.
  • DIV(i) represents the number of block divisions determined by the LD block variable control unit 1109 as the number of block divisions with which the calculation of the LD luminance information can be completed within two frames when the frame F(i) is inputted.
  • the LD luminances are calculated within two frames on the basis of the image data of the inputted frame F(i).
  • the display control is performed such that the frame F(i) is displayed in a state in which the backlight 1112 is subjected to the LD control in accordance with the calculated LD luminances, at the timing delayed by two frames.
  • Fig. 4 illustrates the timing of the LD control to be performed if the two continuous frames are identical, i.e., if the inputted screen image is the still image or in the still state.
  • DIV(i) represents the number of block divisions determined by the LD block variable control unit 1109 as the number of block divisions with which the calculation of the LD luminance information can be completed within two frames when the frame F(i) is inputted.
  • LD(i) represents the LD luminance adapted to the frame F(i) as calculated by the LD luminance calculating unit 1107.
  • the frame F(i) is displayed in a state in which the backlight 1112 is subjected to the light emission control on the basis of the calculated LD luminance LD(i) at the timing T(i+2) delayed by two frames from the timing T(i) at which the frame F(i) is inputted.
  • the LD luminance calculating unit 1107 starts the calculation of the LD luminance LDup1 with the number of block divisions DIVup1 in which the number of block divisions DIV(i) is increased by one level.
  • the LD luminance information holding unit 1108 outputs the LD luminance LD(i) calculated with the number of block divisions DIV(i) to the luminance correcting unit 1102 and the backlight control unit 1111 until the LD luminance calculating unit 1107 completes the calculation of the LD luminance LDup1 with the number of block divisions DIVup1.
  • the LD luminance calculating unit 1107 completes the calculation of the LD luminance LDup1 with the number of block divisions DIVup1, the LD luminance information, which is to be outputted to the luminance correcting unit 1102 and the backlight control unit 1111, is switched into the information of the LD luminance LDup1 by the LD luminance information holding unit 1108.
  • the calculation of the LD luminance LDup2 is completed within the display period of the frame F(j), and hence the LD luminance LDup2 is applied to those starting from the display of the frame F(j+1).
  • the process is performed such that the number of block divisions is increased in a stepwise manner as the time elapses.
  • a procedure is also conceived, in which the number of block divisions is increased at once without increasing the number of block divisions in the stepwise manner.
  • the flicker arises due to the sudden luminance change of the displayed image, and any sense of incongruity is given to a user.
  • the number of block divisions is increased in the stepwise manner as the time elapses as described above, then it is possible to suppress the occurrence of any uneven luminance without giving the sense of incongruity to the user, and it is possible to improve the quality of the displayed image. Therefore, in this embodiment, it is preferable that the number of block divisions is increased in the stepwise manner.
  • the LD block variable control unit 1109 detects the number of pixels and the frame cycle of the video data from the inputted video data S101. In this procedure, it is assumed that the number of pixels 1440 x 960 and the frame cycle Ts are detected. If the frame F(i) is inputted, the LD block variable control unit 1109 retrieves the number of block divisions with which all of the LD luminances can be calculated within a period of time shorter than the delay time (two frames in this procedure) by making reference to the number of block divisions table on the basis of the number of pixels and the frame cycle detected as described above. The LD block variable control unit 1109 outputs the retrieved number of block divisions DIV(i) to the LD luminance calculating unit 1107. The delay time is the delay time until the display is performed after the image data of the frame is inputted.
  • the LD block variable control unit 1109 retrieves the maximum value of the processing time shorter than the time (2 x Ts) which is twice the frame cycle, from the column in which the number of pixels is 1440 x 960 in the number of block divisions table shown in Fig. 2.
  • the maximum value of the processing time shorter than 2 x Ts is t_p+3_q.
  • the LD block variable control unit 1109 determines the number of block divisions corresponding to the processing time t_p+3_q as the number of block divisions DIV(i) to be applied to the frame F(i), and the number of block divisions is held as the latest number of block divisions (st501).
  • the frame comparing unit 1106 performs a comparing process in order to judge whether or not the frame image data of the inputted video signal is identical with the frame image data of one frame ago, concurrently with the calculating process for calculating the LD luminance performed by the LD luminance calculating unit 1107.
  • the frame comparing unit 1106 judges whether or not the present frame is identical with the frame of one frame ago at the point in time T(i+1) at which the input of the frame image data is completed (st503).
  • the routine transits to a process for increasing the number of block divisions as described later on (bl600).
  • the LD block variable control unit 1109 changes the way of division of the area of the backlight 1112 corresponding to the uncalculated LD blocks so that the calculating process for calculating the LD luminance to be applied to the frame F(i) can be completed within one remaining frame. In this procedure, the LD block variable control unit 1109 decreases the number of uncalculated LD blocks by collecting two uncalculated LD blocks adjoining in the lateral direction to provide one new uncalculated LD block.
  • Uncalculated LD blocks which cannot be collected as two blocks in the lateral direction, are left as they are, for example, when the number of uncalculated LD blocks is an odd number on the basis of the initial number of block divisions DIV(i) or when the number of divisions in the lateral direction is an odd number.
  • the method for changing the way of division of the area of the backlight 1112 corresponding to uncalculated LD blocks is not limited thereto.
  • the LD block variable control unit 1109 outputs the information of the uncalculated LD blocks after the decrease to the LD luminance calculating unit 1107.
  • the LD luminance calculating unit 1107 calculates the LD luminance on the basis of the image data of the frame F(i) for each of the uncalculated LD blocks after the decrease (st512). According to the processes as described above, the control is performed such that the calculation of the LD luminance is completed within two frames after the input of the frame. Therefore, even when the LD control is performed during the period in which the moving image is displayed, it is possible to suppress the delay ranging from the input to the display.
  • the calculation of the LD luminance LDup1 with the number of block divisions DIVup1 is started from the time T(i+2), and the calculation is completed within the display period (T(i+4) to T(i+5)) of the frame F(i+2).
  • the luminance correcting unit 1102 corrects the luminance with respect to the image data of the frame F(i+2) read from the buffer unit 1101 on the basis of the information of the LD luminance LD(i).
  • the backlight control unit 1111 controls the light emission of each of the light source blocks of the backlight 1112 in accordance with the LD luminance LD(i).
  • the display of the frame F(i+2) is performed in a state in which the backlight 1112 is subjected to the LD control with the LD luminance LD(i) (st611). After that, the routine returns to the process for detecting the input of the next frame (st604).
  • the LD luminance information holding unit 1108 updates the information of the latest LD luminance by using the LD luminance LDup1 for which the calculation has been completed, and the LD luminance LDup1 is held as the latest LD luminance.
  • the backlight control unit 1111 controls the light emission of each of the light source blocks of the backlight 1112 in accordance with the information of the latest LD luminance LDup1 acquired from the LD luminance information holding unit 1108.
  • the display of the frame F(i+3) is performed in a state in which the backlight 1112 is subjected to the LD control with the LD luminance LDup1 calculated with the number of block divisions DIVup1 which is increased by one level (st607, A8 in Fig. 4).
  • the LD block variable control unit 1109 receives the LD luminance calculation completion notification from the LD luminance calculating unit 1107.
  • the number of block divisions DIVup2, which is further increased by one level, is acquired from the number of block divisions table.
  • the number of block divisions DIVup2 is held, which is outputted to the LD luminance calculating unit 1107.
  • the LD luminance calculating unit 1107 starts the calculation of the LD luminance with the latest number of block divisions DIVup2 acquired from the LD block variable control unit 1109 (st608). After that, the routine returns to the process for detecting the input of the next frame (st604).
  • the delay time is three frames
  • the number of uncalculated LD blocks is judged after the elapse of two frames from the start of the calculation, and the process is performed, for example, such that the uncalculated LD blocks are decreased so that the calculation of the LD luminance can be completed within one remaining frame.
  • the pixel values are compared with each other in units of pixels between two pieces of temporally adjoining frame image data (between frames) by means of the frame comparing unit 1106. If the number of pixels in which the pixel values are changed in the entire frame image data (amount of motion of the image) is not more than the predetermined threshold value A, the image, which is based on the image data inputted from the video output apparatus 12, is judged to be the still image. If the number of pixels is not more than the threshold value B (threshold value B > threshold value A) and larger than the threshold value A, it is judged that the image, which is based on the image data inputted from the video output apparatus 12, is the moving image having small motion. If the number of pixels is larger than the predetermined threshold value B, it is judged that the image, which is based on the image data inputted from the video output apparatus 12, is the moving image having large motion.
  • the judgment to judge whether the image is either the moving image or the still image and the judgment to judge whether the image is either the moving image having large motion or the moving image having small motion may be performed on the basis of the motion vector. Specifically, the sum total of the magnitudes of the motion vectors of the entire image (amount of motion of the image) is calculated in relation to two pieces of temporally adjoining frame image data (between frames) in the frame comparing unit 1106. If the sum total of the magnitudes of the motion vectors is not more than a predetermined threshold value, it is judged that the image, which is based on the image data inputted from the video output apparatus 12, is the still image or the moving image having small motion. If the sum total of the magnitudes of the motion vectors is larger than the predetermined threshold value, it is judged that the image, which is based on the image data inputted from the video output apparatus 12, is the moving image having large motion.
  • the LD block variable control unit 1109 which receives, from the LD information detecting unit 1151, the detection result to notify that the LD luminance information is added to the video signal, performs the following control with respect to the LD luminance information holding/switching unit 1152. That is, the LD block variable control unit 1109 performs the control with respect to the LD luminance information holding/switching unit 1152 so that the LD luminance information, which is to be outputted to the backlight control unit 1111 and the luminance correcting unit 1102, is switched into the LD luminance information inputted from the LD information detecting unit 1151.
  • the display in which the most appropriate LD luminance information is applied, can be instantaneously performed without waiting for the completion of the calculation of the LD luminance to be performed by the LD luminance calculating unit 1107. Even in the case of the moving image without being limited to the still image, it is possible to further decrease the delay in the image display in which the LD control is performed, by performing the LD control by utilizing the previously calculated LD luminance information added to the video signal.
  • the LD information detecting unit 1151 monitors whether or not the LD luminance information and the frame ID information explained with reference to Fig. 13 as described later on are included in the external LD luminance data S102 inputted from the external I/F control unit 1153. If the LD information detecting unit 1151 detects that the frame ID information and the LD luminance information are included in the external LD luminance data, they are stored as the LD luminance information table. Further, the LD luminance information, which is acquired from the external LD luminance data, is outputted to the LD luminance information holding/switching unit 1152 by the LD information detecting unit 1151.
  • the LD information detecting unit 1151 monitors the presence or absence of the additional information of the video signal as explained with reference to Fig. 12 described later on, and the LD information detecting unit 1151 monitors whether or not the frame ID information is included in the additional information. If it is detected that the frame ID information is included in the additional information of the video signal, the LD information detecting unit 1151 judges whether or not the frame ID, which is identical with the frame ID added to the video signal, is present in the frame IDs stored in the LD luminance information table. The judgment result is outputted as the identical frame ID detection information to the LD block variable control unit 1109 by the LD information detecting unit 1151.
  • the LD block variable control unit 1109 performs the following control with respect to the LD luminance information holding/switching unit 1152. That is, the LD block variable control unit 1109 performs the control with respect to the LD luminance information holding/switching unit 1152 so that the LD luminance information, which is to be outputted to the luminance correcting unit 1102 and the backlight control unit 1111, is switched into the LD luminance information inputted from the LD information detecting unit 1151.
  • the external I/F control unit 1153 If the data ID of the LD luminance information is detected in the received external LD luminance data as described later on, the external I/F control unit 1153 outputs the external LD luminance data to the LD information detecting unit 1151.
  • the external interface is not limited to the Ethernet (trade name). It is also allowable to use USB and IEEE 1394 as well as a mobile phone irrelevant to the distinction in relation to the wireless or the wired.
  • Fig. 12B illustrates the data configuration of the external LD luminance data.
  • the data ID is the identification information to indicate that the external LD luminance data is the data which relates to the LD luminance information.
  • the frame ID is the identification information of the frame to which the LD luminance information included in the external LD luminance data is applied.
  • the LD luminance information and other information are described continuously to the identification information.
  • the LD information detecting unit 1151 monitors whether or not the LD luminance information and the frame ID information are included in the external LD luminance data inputted from the external I/F control unit 1153 (st1201). If the LD luminance information and the frame ID information are included in the external LD luminance data, the LD information detecting unit 1151 stores the concerning frame ID and the LD luminance in the LD luminance information table while allowing the concerning frame ID and the LD luminance to be in correlation with each other (st1202).
  • the LD information detecting unit 1151 performs the retrieval for whether or not the frame ID, which is identical with the concerning detected frame ID, is present in the LD luminance information table (st1204).
  • the LD information detecting unit 1151 If the frame ID, which is identical with the frame ID acquired from the additional information of the video signal, is present in the LD luminance information table, the LD information detecting unit 1151 outputs the identical frame ID detection information to the LD block variable control unit 1109. Further, the LD luminance information, which is allowed to correlate with the frame ID identical with the frame ID acquired from the additional information of the video signal, is acquired from the LD luminance information table by the LD information detecting unit 1151, and the LD luminance information is outputted to the LD luminance information holding/switching unit 1152. The LD luminance information is outputted to the backlight control unit 1111 and the luminance correcting unit 1102 by the LD luminance information holding/switching unit 1152.
  • the backlight control unit 1111 controls the light emission of each of the light source blocks of the backlight 1112 in accordance with the LD luminance information acquired from the LD luminance information holding/switching unit 1152.
  • the luminance correcting unit 1102 performs the luminance correction for the frame image data on the basis of the LD luminance information inputted from the LD luminance information holding/switching unit 1152. According to the process as described above, the LD control is performed on the basis of the LD luminance information acquired from the external LD luminance data by the LD information detecting unit 1151 (st1205).
  • the example has been explained, in which it is judged whether the image is either the moving image or the still image in relation to one displayed image, or it is judged whether the image is either the moving image having large motion or the moving image or the still image having small motion in relation to one displayed image so that the number of block divisions (the size of light emission control block) is determined in accordance with the obtained judgment result in the LD control.
  • the number of block divisions (the size of light emission control block) in the LD control is determined with respect to a moving image including both of a photographic subject (object) having small motion and a photographic subject (object) having large motion as compared with the foregoing photographic subject (object).
  • Fig. 14 shows functional blocks of an image display apparatus according to the fourth embodiment.
  • the difference between the image display apparatus of this embodiment and the image display apparatus according to the first embodiment resides in that an area type determining unit 1113 (area determining unit) is added.
  • Fig. 15 illustrates the flow of the operation in the fourth embodiment.
  • Figs. 16A, 17A, and 18A show examples of displayed images in the fourth embodiment.
  • Figs. 16B, 17B, and 18B illustrate the division control for LD blocks with respect to the exemplary displayed images in the fourth embodiment. The operation of the image display apparatus of this embodiment will be explained with reference to Figs. 14 to 18.
  • the number of block divisions DIV(i), which is to be applied to the frame F(i), is determined (st1401) in the same manner as in the first embodiment. Subsequently, the amount of motion of the image is detected to perform an area determining process for the image (st1402).
  • the great difference between the first embodiment and the fourth embodiment resides in the area determining process for the image in st1402.
  • the image determining process in the first embodiment is executed on the basis of the amount of motion of the pixels in the entire frame image data.
  • the image determining process in this embodiment is executed on the basis of the amount of motion of the pixels in relation to each of divided areas of the frame image data.
  • the area type determining unit 1113 outputs, to the LD luminance calculating unit 1107, the information to indicate whether or not the two types of areas of the area m and the area n are present in a mixed manner in the moving image based on the moving image data inputted from the video output apparatus 12. If the two types of areas, i.e., the area m and the area n are present in the mixed manner, the position information of each of the areas (area position information) is outputted to the LD luminance calculating unit 1107 (st1403).
  • the LD luminance calculating unit 1107 for example, as shown in the left drawing in Fig.
  • the number of block divisions of the area m is the number of divisions which is 3/4 of the number of block divisions DIV(i) of the entire image
  • the number of block divisions of the area n is the number of divisions which is 1/4 of the number of block divisions DIV(i) of the entire image.
  • the LD luminance calculating unit 1107 progressively performs the calculation of the LD luminance information LD(i) with the number of block divisions DIV(i) for each of the areas (areas m, n). Specifically, the image data of the frame F(i), which is read from the buffer unit 1101, is progressively analyzed by the LD luminance calculating unit 1107 in units of the divided areas in relation to each of the areas on the basis of the area position information. In this embodiment, if the areas m and n are present in the mixed manner while taking the judgment result provided in st1403 into account, the calculation is firstly performed for the LD luminance of the divided area corresponding to the area n (st1404).
  • the process for determining the LD luminance for the moving image shown in Fig. 15 is the process corresponding to the processes of st504 to st507, st511, and st512 shown in Fig. 5 in the first embodiment.
  • the delay time is two frames
  • the areal size of the area m is the size of 3/4 of the areal size of the entire image area
  • the areal size of the area n is the size of 1/4 of the areal size of the entire image area. Therefore, the periods of time, which can be consumed for the calculation of the LD luminance allotted to the areas m, n, are 0.5 frame (2 frames x 1/4) and 1.5 frames (2 frames x 3/4) respectively.
  • it is necessary that the area n should have the LD block divided areas for which the calculation of the LD luminance can be completed within 0.5 frame.
  • the LD block variable control unit 1109 acquires the number of blocks for which the LD luminance calculation has been completed, from the LD luminance calculating unit 1107 at the point in time at which a predetermined period of time (0.25 frame in this procedure) has elapsed after the start of the calculation of the LD luminance LD(i), in the same manner as in the first embodiment so that the progress status of the calculation of the LD luminance LD(i) is confirmed.
  • the LD block variable control unit 1109 determines the number of block divisions to be applied to the next frame and the followings (F(i+1) and the followings) on the basis of the concerning confirmation result, and the number of block divisions is applied thereto. According to this control, it is possible to suppress the delay ranging from the input to the display, even is the LD control is performed when the moving image is displayed.
  • the LD block variable control unit 1109 judges that it is impossible to calculate the LD luminance for the uncalculated LD blocks within remaining 0.25 frame in the case of the initial number of block divisions of the area n. In this case, the LD block variable control unit 1109 redivides the area of the backlight 1112 corresponding to the uncalculated LD blocks into the LD blocks of a number smaller than the number of uncalculated LD blocks.
  • the LD block variable control unit 1109 holds, as the latest number of block divisions, the value obtained by multiplying the number of block divisions (DIVdn1) obtained by the retrieval by the ratio of the number of block divisions of the area n with respect to the number of block divisions of the entire image.
  • the number of block divisions of the area n is the number of divisions which is 1/4 of the number of block divisions of the entire image. Therefore, the number of block divisions of DIVdn1 x 1/4 is held by the LD block variable control unit 1109. If the value of DIVdn1 x 1/4 is indivisible, the LD block variable control unit 1109 holds the number of block divisions obtained by omitting the figures below the decimal point.
  • the LD luminance calculating unit 1107 acquires the concerning latest number of block divisions DIVdn1 from the LD block variable control unit 1109, and the concerning latest number of block divisions DIVdn1 is set as the number of block divisions to be applied to the next frame and the followings (F(i+1) and the followings). Accordingly, the number of block divisions is corrected so that the calculation of the LD luminance for the next frame F(i+1) and the followings is reliably completed within 0.5 frame.
  • the LD block variable control unit 1109 changes the way of division of the area of the backlight 1112 corresponding to uncalculated LD blocks so that the calculating process for calculating the LD luminance to be applied to the frame F(i) can be completed within remaining 0.25 frame. In this procedure, the LD block variable control unit 1109 decreases the number of uncalculated LD blocks by collecting two uncalculated LD blocks adjoining in the lateral direction to provide one new uncalculated LD block.
  • Uncalculated LD blocks which cannot be collected as two blocks in the lateral direction, are left as they are, for example, when the number of uncalculated LD blocks is an odd number in the case of the initial number of block divisions DIV(i) or when the number of divisions in the lateral direction is an odd number.
  • the method for changing the way of division of the area of the backlight 1112 corresponding to uncalculated LD blocks is not limited thereto.
  • the LD block variable control unit 1109 outputs the information of the uncalculated LD blocks after the decrease to the LD luminance calculating unit 1107.
  • the LD luminance calculating unit 1107 calculates the LD luminance on the basis of the image data of the frame F(i) for each of the uncalculated LD blocks after the decrease. According to the processes as described above, the control is performed such that the calculation of the LD luminance is completed within 0.5 frame after the input of the frame. Therefore, even when the LD control is performed during the display of the moving image, it is possible to suppress the delay ranging from the input to the display.
  • the calculation of the LD luminance is executed by the LD luminance calculating unit 1107 with respect to the area m (st1406).
  • the LD luminance LD(i) is applied to the area m of the frame F(i) in the same manner as in the first embodiment.
  • the process for increasing the number of block divisions is performed to increase the number of block divisions in a stepwise manner in the same manner as in the first embodiment. In other words, the process is performed for decreasing the size of the light emission control block in relation to the area m in a stepwise manner.
  • the number of block divisions of the area m is increased in a stepwise manner, and the maximum number of block divisions, which is applicable to the area m, is applied to the area m in some cases.
  • the maximum number of block divisions is continuously applied to the area m if the frame image data is not changed, after the application of the maximum number of block divisions.
  • the ability to perform the calculating process which corresponds to the amount of the LD luminance calculating process for the area m for which the execution is not performed, is allotted to the LD luminance calculating process for the area n.
  • the ability to perform the LD luminance calculating process for the area n is enhanced. It is possible to further increase the number of divisions of the area n, while maintaining the maximum number of block divisions of the area m. Therefore, it is possible to further suppress the uneven luminance in the moving image, and it is possible to perform the high quality display.
  • the following process is performed. That is, it is judged whether or not only the area, in which the amount of motion of pixels between the frames of the image obtained in st1402 is not more than a predetermined threshold value, is present, or whether or not only the area, in which the amount of motion is larger than the predetermined threshold value, is present (st1408).
  • the process for increasing the number of block divisions in a stepwise manner or the process for determining the LD luminance for the moving image is performed (st1409, st1410).
  • This embodiment is also applicable to the so-called P in P (Picture in Picture) display in which another image is superimposed and displayed on a part of the area of the image.
  • P in P Picture in Picture
  • a moving image is displayed on a partial area of a still image as shown in Fig. 18A
  • the process for determining the LD luminance for the moving image in st1405 shown in Fig. 15 is executed for the moving image area.
  • the process for increasing the number of block divisions in st1407 shown in Fig. 15 is executed for the still image area as shown in Fig. 18B.
  • the processing ability to perform the LD luminance calculating process may be allotted to the process for calculating the LD luminance for the moving image area.
  • the ability to perform the LD luminance calculating process for the moving image area is enhanced, and it is possible to further increase the number of block divisions of the moving image area, while maintaining the maximum number of block divisions of the still image area. Therefore, it is possible to further suppress the uneven luminance in the moving image, and it is possible to perform the high image quality display.
  • the process of this embodiment may be applied to the second embodiment. Specifically, it is also allowable to construct such a procedure that the process of this embodiment is executed in st903 shown in Fig. 10 in the second embodiment. Further, the process of this embodiment may be applied to the third embodiment. Specifically, it is also allowable to construct such a procedure that the process of this embodiment is executed in st1206 shown in Fig. 13 in the third embodiment.
  • This embodiment is illustrative of such a case that the moving image and the still image are displayed on one screen of the image display apparatus 11.
  • a moving image having large motion and a moving image having small motion are displayed on one screen of the image display apparatus 11, it is possible to perform the same or equivalent process.
  • images of three or more types based on mutually different pieces of image data in which a moving image having large motion is combined with at least one of a still image and a moving image having small motion, are displayed on one screen of the image display apparatus 11, it is possible to perform the same or equivalent process.
  • the area type determining unit 1113 acquires the attached information (information to indicate the file type such as JPEG, MPEG or the like) of the image data outputted from the video output apparatus 12 to judge the type for each of the areas.
  • the video output apparatus 12 and the image display apparatus 11 are connected to one another via an interface (for example, HDMI, Display Port or the like) with which the attached information of the image data can be transmitted/received.
  • This embodiment is illustrative of the exemplary case in which the process for increasing the number of divisions is executed in st1407 shown in Fig. 15.
  • the still image area is a moving image area having small motion in st1407 shown in Fig. 15, it is also allowable to perform the control such that the number of block divisions is decreased on the basis of the change of the amount of motion of the image.
  • the explanation has been made on condition that the division of the backlight 1112 by using the LD blocks is the equal division in relation to both of the lateral direction and the longitudinal direction (all of the LD blocks have the same size).
  • the division widths and/or the LD block sizes are not equivalent in one screen.
  • the explanation has been made about the exemplary case of the number of block divisions table as prepared while considering the frame cycle and the number of pixels of the video data as the elements or factors which affect the period of time required to calculate the LD luminance.
  • the data length of the video data may be considered as the element or factor relevant to the calculation of the LD luminance.
  • the number of block divisions table may be provided for each of video modes (for example, VESA, SMPTE (definition of frame cycle and number of pixels standardized or normalized by the standard organization) or the like).
  • the control is performed to change the number of block divisions on the basis of, for example, the type of the image.
  • the number of light sources is changed within one LD block. That is, in the present invention, the control is performed such that the number of light sources in one LD block is changed on the basis of, for example, the type of the image, in other words.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

La présente invention porte sur un appareil d'affichage d'image servant à afficher une image sur la base de données d'image ; l'appareil d'affichage d'image comprenant une unité d'émission de lumière comprenant une pluralité de sources de lumière pour effectuer une émission de lumière qui peuvent être respectivement commandées d'une manière indépendante ; une unité de réglage qui règle des blocs de commande d'émission de lumière servant à commander une source de lumière ou la pluralité de sources de lumière à une luminosité commune ; une unité de détermination de luminosité qui détermine la luminosité d'émission de lumière de chacun des blocs de commande d'émission de lumière sur la base des données d'image ; et une unité de commande qui commande l'émission de lumière de l'unité d'émission de lumière pour chacun des blocs de commande d'émission de lumière en fonction de la luminosité d'émission de lumière déterminée par l'unité de détermination. L'unité de réglage règle une dimension du bloc de commande d'émission de lumière de l'unité d'émission de lumière en fonction d'une quantité de mouvement de l'image.
PCT/JP2012/005610 2011-09-05 2012-09-05 Appareil d'affichage d'image et son procédé de commande WO2013035315A1 (fr)

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JP2011192825 2011-09-05
JP2011-192825 2011-09-05
JP2012181826A JP6230218B2 (ja) 2011-09-05 2012-08-20 画像表示装置及びその制御方法
JP2012-181826 2012-08-20
JP2012-191713 2012-08-31
JP2012191713A JP6202793B2 (ja) 2012-08-31 2012-08-31 画像表示装置及びその制御方法

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002006815A (ja) * 2000-06-21 2002-01-11 Sony Corp 液晶表示装置
JP2009175415A (ja) * 2008-01-24 2009-08-06 Toshiba Mobile Display Co Ltd 液晶表示装置
WO2011039996A1 (fr) * 2009-09-30 2011-04-07 パナソニック株式会社 Dispositif de rétro-éclairage et dispositif d'affichage
WO2011040011A1 (fr) * 2009-10-02 2011-04-07 パナソニック株式会社 Dispositif de rétro-éclairage et appareil d'affichage

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002006815A (ja) * 2000-06-21 2002-01-11 Sony Corp 液晶表示装置
JP2009175415A (ja) * 2008-01-24 2009-08-06 Toshiba Mobile Display Co Ltd 液晶表示装置
WO2011039996A1 (fr) * 2009-09-30 2011-04-07 パナソニック株式会社 Dispositif de rétro-éclairage et dispositif d'affichage
WO2011040011A1 (fr) * 2009-10-02 2011-04-07 パナソニック株式会社 Dispositif de rétro-éclairage et appareil d'affichage

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