WO2012108361A1 - 表示装置および駆動方法 - Google Patents
表示装置および駆動方法 Download PDFInfo
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- WO2012108361A1 WO2012108361A1 PCT/JP2012/052540 JP2012052540W WO2012108361A1 WO 2012108361 A1 WO2012108361 A1 WO 2012108361A1 JP 2012052540 W JP2012052540 W JP 2012052540W WO 2012108361 A1 WO2012108361 A1 WO 2012108361A1
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- signal line
- scanning signal
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- display
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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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
- G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
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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
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
-
- 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
- G09G3/36—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 using liquid crystals
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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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0202—Addressing of scan or signal lines
- G09G2310/0218—Addressing of scan or signal lines with collection of electrodes in groups for n-dimensional addressing
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
-
- 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
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
Definitions
- the present invention relates to a display device and a driving method that can reduce power consumption.
- Patent Document 1 discloses a display device that achieves low power consumption by providing a non-scanning period longer than the scanning period for scanning the screen once, and providing a pause period in which all scanning signal lines are in a non-scanning state. A driving method is disclosed.
- Patent Document 1 has the following problems.
- low power consumption is realized by providing a non-scanning period, that is, a pause period, longer than the scanning period. That is, since it is necessary to provide a non-scanning period longer than the scanning period in one vertical period, the number of times of rewriting the screen per unit time is reduced. Therefore, the refresh rate of each pixel is lowered. When the refresh rate is lowered, flickering on the screen is likely to occur depending on the characteristics of the display panel.
- a reduction in the refresh rate is synonymous with a reduction in the number of images that can be displayed per second, and thus a moving image cannot be displayed smoothly.
- the refresh rate is set to 60 Hz, and 60 images are rewritten per second.
- the refresh rate is 20 Hz, which is one third of the normal case. That is, only 20 images can be rewritten per second, resulting in a moving image display with frames dropped. For this reason, in the technique described in Patent Document 1, it is particularly difficult to display a moving image.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a display device and a driving method capable of displaying a moving image without causing flicker and reducing power consumption.
- a display device includes a display panel having a plurality of scanning signal lines and a plurality of data signal lines, a scanning line driving circuit for sequentially selecting and scanning the plurality of scanning signal lines, and the selected scanning signal line.
- a signal line driving circuit for supplying data signals from the plurality of data signal lines to each of the pixels, and among the plurality of scanning signal lines for displaying a specific color among all the scanning signal lines. The number of scans per unit time of the first scanning signal line, which is at least one of the above, is smaller than the scanning signal lines for display of other colors.
- the driving method includes a display panel having a plurality of scanning signal lines and a plurality of data signal lines, a scanning line driving circuit that sequentially selects and scans the plurality of scanning signal lines, and the selected scanning.
- a display device driving method comprising a signal line driving circuit for supplying a data signal from the plurality of data signal lines to each pixel on a signal line, wherein a specific color of all the scanning signal lines The number of scans per unit time of the first scan signal line, which is at least one of the plurality of display scan signal lines, is smaller than that of the other color display scan signal lines. To do.
- the display device and the driving method thereof according to the present invention it is possible to display a moving image without generating flicker and to reduce power consumption.
- FIG. 1 is a diagram illustrating an overall configuration of a display device 1 according to Embodiment 1.
- FIG. 6 is a diagram illustrating various signal waveforms used when performing a display operation by the display device 1 according to the first embodiment.
- FIG. 6 is a diagram illustrating various signal waveforms used when performing a display operation by the display device 1 according to the first embodiment. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 2.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 2.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 2.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 2.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 2.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 2.
- FIG. It is a figure which shows the frame period structure at the time of a display apparatus performing display operation. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 3.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 3.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 3.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 3.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 4.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 4.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 4.
- FIG. 3 is a diagram illustrating an array of pixel display colors of a display panel 2 provided in the display device 1.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 5.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 5.
- FIG. It is a figure which shows the various signal waveforms used when performing the display operation by the display apparatus 1 which concerns on Embodiment 5.
- FIG. 1 is a diagram illustrating an overall configuration of a display device 1 according to the first embodiment.
- a display device 1 includes a display panel 2, a scanning line driving circuit (gate driver) 4, a signal line driving circuit (source driver) 6, a common electrode driving circuit 8, a timing controller 10, and a power generation circuit. 13 is provided.
- the display panel 2 includes a screen composed of a plurality of pixels arranged in a matrix, and N scanning signal lines G (gate lines) for selecting and scanning the screen in a line-sequential manner. And M (M is an arbitrary integer) data signal lines S (source lines) that supply data signals to pixels of one row included in the selected line.
- the scanning signal line G and the data signal line S are orthogonal to each other.
- the n-th (n is an arbitrary integer) scanning signal line G is denoted as G (n).
- G (1), G (2), and G (3) indicate the first, second, and third scanning signal lines G, respectively.
- the i-th data signal line S (i is an arbitrary integer) is denoted as S (i).
- S (1), S (2), and S (3) indicate the first, second, and third data signal lines S, respectively.
- the first scanning signal line G (1) is a scanning signal line (hereinafter referred to as “scanning signal line”) connecting a plurality of red pixels arranged in a straight line in the horizontal direction. Gr ").
- the second scanning signal line G (2) is referred to as a scanning signal line (hereinafter referred to as “scanning signal line Gg”) connecting a plurality of green pixels arranged in a straight line in the horizontal direction. ).
- the third scanning signal line G (3) is referred to as a scanning signal line (hereinafter referred to as “scanning signal line Gb”) that connects a plurality of blue pixels arranged in a straight line in the horizontal direction. ).
- the display panel 2 of the eleventh embodiment employs a horizontal stripe arrangement as a color filter arrangement method.
- the scanning line driving circuit 4 scans each scanning signal line G line-sequentially from the top to the bottom of the screen.
- the scanning line driving circuit 4 sequentially outputs a voltage for turning on a switching element (TFT) provided in each pixel on the scanning signal line G with respect to each scanning signal line G. Thereby, the scanning line driving circuit 4 sequentially selects and scans the scanning signal lines G.
- TFT switching element
- the signal line driving circuit 6 supplies a data signal as image data from each data signal line S to each pixel on the selected scanning signal line G. More specifically, the signal line driving circuit 6 calculates the value of the voltage to be output to each pixel on the selected scanning signal line G based on the input video signal (arrow A), and the value Is output to each data signal line S. As a result, image data is supplied to each pixel on the selected scanning signal line G.
- the display device 1 includes a common electrode (not shown) provided for each pixel in the screen.
- the common electrode driving circuit 8 outputs a predetermined common voltage for driving the common electrode to the common electrode based on a signal (arrow B) input from the timing controller 10.
- Timing controller 10 outputs a reference signal for each circuit to operate in synchronization with each circuit. Specifically, the timing controller 10 supplies a gate start pulse signal, a gate clock signal GCK, and a gate output control signal GOE to the scanning line driving circuit 4 (arrow E). The timing controller 10 outputs a source start pulse signal, a source latch strobe signal, and a source clock signal to the signal line driver circuit 6 (arrow F).
- the scanning line driving circuit 4 starts scanning the display panel 2 with the gate start pulse signal received from the timing controller 10 as a cue, and each scanning signal line according to the gate clock signal GCK and the gate output control signal GOE received from the timing controller 10.
- a selection voltage is sequentially applied to G. More specifically, the scanning line driving circuit 4 sequentially selects each scanning signal line G according to the received gate clock GCK signal. Then, the scanning line driving circuit 4 applies a selection voltage to the selected scanning signal line G at the timing when the falling edge of the received gate output control signal GOE is detected. Thereby, the scanning line driving circuit 4 scans the selected scanning signal line G.
- the signal line drive circuit 6 Based on the source start pulse signal received from the timing controller 10, the signal line drive circuit 6 stores the input image data of each pixel in a register in accordance with the source clock signal, and each of the display panels 2 in accordance with the next source latch strobe signal. Image data is written to the data signal line S.
- the power supply generation circuit 13 generates Vdd, Vdd2, Vcc, Vgh, and Vgl, which are voltages necessary for each circuit in the display device 1 to operate. Then, Vcc, Vgh, and Vgl are output to the scanning line driving circuit 4, Vdd and Vcc are output to the signal line driving circuit 6, Vcc is output to the timing controller 10, and Vdd 2 is output to the common electrode driving circuit 8.
- FIG. 2 is a diagram showing various signal waveforms used when performing a conventional display operation.
- the gate output control signal GOE is input from the timing controller 10 to the scanning line driving circuit 4 every horizontal scanning period.
- the scanning line driving circuit 4 changes the voltage applied to the first scanning signal line G from Vgl (L value) to Vgh (H value) in synchronization with the gate output control signal GOE. To change. As a result, the gate of the TFT of the pixel connected to the scanning signal line G (1) is turned on.
- the signal line drive circuit 6 starts from the analog amplifier 14 connected to the data signal line S (i) for each data signal line S in synchronization with the gate output control signal GOE. Output data signal.
- a voltage necessary for display is supplied to each data signal line S and written to the pixel electrode through the TFT.
- the signal line driving circuit 6 applies the scanning signal line G (1) to the scanning signal line G (1) based on the image data regarding the scanning signal line G (1).
- a voltage necessary for display is applied to each pixel electrode of the connected plurality of red pixels.
- the next gate output control signal GOE is input to the scanning line driving circuit 4.
- the pixels for one row connected to the second and subsequent scanning signal lines G are driven by the same procedure as the pixels for one row connected to the first scanning signal line G.
- the display device 1 drives the display panel 2 to invert the polarity, the polarity of the voltage applied to the data signal line S (i) is inverted every time a predetermined number of scanning signal lines are scanned.
- the polarity of the voltage applied to the data signal line S (i) is inverted every time three (RGB) scanning signal lines are scanned. For example, as shown in FIG. 2, in the horizontal scanning period in which the first to third scanning signal lines G (1) to G (3) are scanned, a positive data signal is applied to the data signal line S (i). In the horizontal scanning period during which the fourth to sixth scanning signal lines G (4) to G (6) are scanned, a negative data signal is applied to the data signal line S (i).
- the display device 1 rewrites the screen once by repeating the above and sequentially scanning from the first row to the last row during one frame period (one vertical scanning period). In the display device 1, since the refresh rate is 60 Hz, the screen is rewritten 60 times per second.
- FIG. 4 is a diagram showing various signal waveforms in the even frame period.
- FIG. 5 is a diagram showing various signal waveforms in the odd-numbered frame period.
- the display device 1 according to the first embodiment is different from the display operation described in FIG. 2 in that the scanning signal line of a specific color is scanned less times than the scanning signal lines of other colors.
- the scanning signal line Gb is scanned fewer times than the scanning signal line Gr and the scanning signal line Gg.
- the scanning line driving circuit 4 scans all of the scanning signal line Gr, the scanning signal line Gg, and the scanning signal line Gb.
- the scanning line driving circuit 4 scans the scanning signal line Gr and the scanning signal line Gg in the same manner as the even frame, but the scanning signal line Gb
- scanning is not performed. That is, a horizontal scanning period during which scanning is not performed for the scanning signal line Gb (hereinafter referred to as “non-scanning period”) is provided.
- the display device 1 of Embodiment 1 sets the number of scans of the scan signal line Gb to 1 ⁇ 2 of the number of scans of the scan signal line Gr and the scan signal line Gg.
- the refresh rate of the scanning signal line Gr and the scanning signal line Gg is 60 Hz, so the refresh rate of the scanning signal line Gb is 30 Hz.
- the scanning line driving circuit 4 shifts the selection to the next scanning signal line.
- the gate output control signal GOE from the timing controller 10 is input, scanning of the selected scanning signal line is started. Specifically, when the scanning line driving circuit 4 detects the falling edge of the gate output control signal GOE, the scanning line driving circuit 4 starts scanning the next scanning signal line.
- the gate output control signal GOE remains fixed at a high level. What is necessary is just to input to the scanning line drive circuit 4 from the timing controller 10.
- the display device 1 of Embodiment 1 inputs the gate output control signal GOE that does not fall during the non-scanning period from the timing controller 10 to the scanning line driving circuit 4. Thereby, the display device 1 according to the first embodiment controls the scanning line driving circuit 4 so as not to scan the scanning signal line Gb in the non-scanning period.
- the display device 1 of Embodiment 1 does not scan the scanning signal line Gb during the non-scanning period. Therefore, it is not necessary to operate the signal line driving circuit 6 in the non-scanning period. Therefore, the display device 1 according to the first embodiment stops or lowers the signal line driving circuit 6 in the non-scanning period in order to further reduce the power consumption of the display device 1.
- the signal line drive circuit 6 includes an analog amplifier for applying a voltage to the data signal line S for each data signal line S. Therefore, for example, when the resolution of the display device 1 is 1366 ⁇ 768, the signal line driving circuit 6 includes 1366 analog amplifiers.
- the display device 1 In the non-scanning period, the display device 1 according to the first embodiment does not operate the scanning signal line Gb and puts the plurality of analog amplifiers into a non-operating state.
- Each analog amplifier is switched between an operating state and a non-operating state by switching the H value / L value of the control signal supplied from the timing controller 10. Therefore, the display device 1 can reduce the performance of each analog amplifier (non-operating state) by changing the control signal supplied from the timing controller 10 to each analog amplifier from the H value to the L value. .
- the polarity of the voltage applied to the data signal line S (i) is inverted every frame period (one vertical scanning period). For example, as shown in FIG. 3, in the even-numbered frame period, in the horizontal scanning period in which the first to third scanning signal lines G (1) to G (3) are scanned, the positive data signal is transferred to the data signal line S ( Apply to i). Further, as shown in FIG. 4, in the odd-numbered frame period, the negative data signal is transferred to the data signal line S (in the horizontal scanning period in which the first to third scanning signal lines G (1) to G (3) are scanned. i).
- the signal line drive circuit 6 includes 1366 analog amplifiers.
- Each analog amplifier is an element that outputs a data signal to a data signal line.
- the self-consumption current of each analog amplifier is about 5 ⁇ A.
- the total self-consumption current of 1366 analog amplifiers is about 6.8 mA.
- the scanning line driving circuit 4 is provided with 768 analog amplifiers.
- Each analog amplifier is an element that outputs a control voltage for the switching element to the scanning signal line.
- the current consumption of each analog amplifier is about 0.4 ⁇ A. Therefore, the total consumption current of 768 analog amplifiers is about 0.3 mA.
- the voltage source (Vgh) supplied to the scanning line driving circuit 4 is usually about 15V.
- the power consumption of the signal line driving circuit 6 and the scanning line driving circuit 4 occupies a considerable amount with respect to the power consumption of the entire display device 1, which is one major cause of hindering the reduction in power consumption of the display device 1. ing.
- the display device 1 has the scanning line driving circuit 4 in the non-scanning period occupying 1/3 of the entire horizontal scanning period among the odd frame periods occupying 1/2 of the entire frame period.
- the signal line drive circuit 6 is in a non-operating state.
- the display device 1 according to the first embodiment brings about a 16.7% reduction in power consumption as the power consumption of the signal line driving circuit 6.
- the display device 1 according to the first embodiment brings about an effect of reducing the power consumption of about 16.7% as the power consumption of the scanning line driving circuit 4.
- the display device 1 sets the number of scans of a scanning signal line for display of a specific color among the plurality of scanning signal lines G as compared to the scanning signal lines for display of other colors. Adopted a configuration that reduces the Thereby, the display apparatus 1 of Embodiment 1 can reduce power consumption as mentioned above compared with the conventional display apparatus which does not employ
- the display device 1 according to the first embodiment employs a configuration in which the number of scans of a scanning signal line for display of a specific color is reduced, not the number of scans of all the scan signal lines. .
- the display device 1 according to the first embodiment is less likely to cause flicker on the screen and has a smoother moving image than a conventional display device that employs a configuration in which the number of scans of all scanning signal lines is reduced. Can be displayed. That is, the display device 1 according to the first embodiment can reduce power consumption while maintaining high-quality moving images.
- the display device 1 according to the first embodiment has a configuration in which the number of scans of the blue display scanning signal line Gb having a smaller luminance ratio among red (R), green (G), and blue (B) is reduced. Adopted.
- the display device 1 according to the first embodiment has less change in luminance than a display device that employs a configuration in which the number of scanning signal lines for displaying colors other than blue is reduced, and thus flicker (flickering) on the screen. ) Is unlikely to occur.
- the display device 1 reduces the capability of the signal line driving circuit 6 in the horizontal scanning period in which the scanning signal line Gb is not scanned.
- the display apparatus 1 of Embodiment 1 can reduce power consumption compared with the display apparatus which does not employ
- the horizontal scanning period is a period in which the screen is not rewritten, so even if this configuration is adopted, there is no influence on the quality of the moving image.
- the display device 1 provides a frame period during which the scanning signal line Gb is not scanned, so that the number of scanning times of the scanning signal line Gb is smaller than that of the scanning signal line Gr and the scanning signal line Gg. . That is, the number of scans of the scan signal line Gb is reduced by thinning out the scan of the scan signal line Gb in the frame period.
- the waveform of the control signal for scanning the scanning signal line Gb (in the first embodiment, the gate output control signal GOE) is different from the control signal for scanning the scanning signal line Gr and the scanning signal line Gg.
- the number of scans of the scanning signal line Gb can be reduced at a lower cost than employing other configurations such as making one frame period of the scanning signal line Gb different from one frame period of the scanning signal line Gr and the scanning signal line Gg. It is possible to realize a configuration that reduces
- the number of scans of the scan signal line Gb is made smaller than the number of scans of the scan signal line Gr and the scan signal line Gg. Specifically, in the first embodiment, the scanning signal line Gr and the scanning signal line Gg are scanned 60 times, and the scanning signal line Gb is scanned 30 times.
- the number of scans of the scanning signal line Gr is further made smaller than the number of scans of the scanning signal line Gg.
- the number of scans of the scan signal line Gg is 60
- the number of scans of the scan signal line Gr is 40
- the number of scans of the scan signal line Gb is 30.
- the display operation by the display device 1 of the second embodiment is different from the display operation by the display device 1 of the first embodiment. For this reason, below, the point which is different from the display operation by the display apparatus 1 of Embodiment 1 among the display operations by the display apparatus 1 of Embodiment 2 is demonstrated.
- FIG. 5 to 10 are diagrams illustrating various signal waveforms used when performing a display operation by the display device 1 according to the second embodiment.
- FIG. 5 is a diagram showing various signal waveforms in the first frame period.
- FIG. 6 is a diagram showing various signal waveforms in the second frame period.
- FIG. 7 is a diagram showing various signal waveforms in the third frame period.
- FIG. 8 shows various signal waveforms in the fourth frame period.
- FIG. 9 is a diagram showing various signal waveforms in the fifth frame period.
- FIG. 10 is a diagram illustrating various signal waveforms in the sixth frame period.
- the display device 1 scans the scan signal lines of a specific color among the scan signal lines of other colors that have not reduced the number of scans in the first embodiment as compared with the scan signal lines of other colors.
- the display device 1 is different from the display device 1 of the first embodiment in that the number of times is reduced.
- the scanning signal line Gb is scanned less times than the scanning signal line Gr and the scanning signal line Gg.
- the scanning signal line Gr is scanned less times than the scanning signal line Gg.
- the scanning line drive circuit 4 Scanning is performed for all of Gr, the scanning signal line Gg, and the scanning signal line Gb.
- the scanning signal line Gb is not scanned in the second, fourth, and sixth frame periods (that is, a frame period that is a multiple of 2). That is, a non-scanning period during which scanning is not performed is provided for the scanning signal line Gb. Thereafter, a non-scanning period for the scanning signal line Gb is provided every two frame periods as in the second, fourth, and sixth frame periods.
- scanning is not performed on the scanning signal line Gr in the third and sixth frame periods (that is, a frame period that is a multiple of 3). That is, a non-scanning period in which scanning is not performed is provided for the scanning signal line Gr. Thereafter, as in the third and sixth frame periods, a non-scanning period for the scanning signal line Gr is provided every three frame periods.
- the display device 1 according to the second embodiment sets the number of scans of the scanning signal line Gb to 1 ⁇ 2 of the number of scans of the scanning signal line Gg. Further, the number of scans of the scanning signal line Gr is set to 2/3 of the number of scans of the scanning signal line Gg.
- the refresh rate of the scanning signal line Gg is 60 Hz, so the refresh rate of the scanning signal line Gr is 40 Hz. Further, the refresh rate of the scanning signal line Gb is 30 Hz.
- the gate output control signal GOE is input to the scanning line driving circuit 4 from the timing controller 10 while being fixed at a high level, so that the scanning line driving circuit 4 is controlled not to perform scanning. This is the same as the display device 1 of the first embodiment. Further, the point that the signal line driving circuit 6 is stopped or the capacity is lowered in each non-scanning period is the same as the display device 1 of the first embodiment.
- the power consumption when the display device 1 performs the conventional display operation will be described.
- the power consumption of the signal line driving circuit 6 is about 88 mW
- the power consumption of the scanning line driving circuit 4 is about 8.1 mW.
- the display device 1 scans in the non-scanning period of the scanning signal line Gb, which occupies 1/3 of the entire horizontal scanning period out of the 1/2 frame period of the entire frame period.
- the line driving circuit 4 and the signal line driving circuit 6 are in a non-operating state.
- the display device 1 also includes the scanning lines in the non-scanning period of the scanning signal line Gr, which occupies 1/3 of the entire horizontal scanning period out of the 1/3 frame period.
- the drive circuit 4 and the signal line drive circuit 6 are in a non-operating state.
- the display device 1 according to the embodiment brings about an effect of reducing the power consumption by about 28% as the power consumption of the signal line driving circuit 6.
- the display device 1 according to the embodiment brings about an effect of reducing the power consumption by about 28% as the power consumption of the scanning line driving circuit 4.
- the display device 1 according to the second embodiment has the number of scans of a specific color display scan signal line out of the plurality of scan signal lines G as compared with the scan signal lines for display of other colors. And the number of scans of the scanning signal line for displaying a specific color among the scanning signal lines for displaying other colors is smaller than that of the scanning signal lines for displaying other colors. Is adopted. As a result, the display device 1 of the embodiment can reduce more power consumption as described above, compared to a conventional display device that does not employ the above configuration.
- the display device 1 according to the second embodiment employs a configuration in which the number of scans of a plurality of color scan signal lines is reduced. For this reason, it is somewhat inferior to the display device 1 of the first embodiment in that it is less likely to cause flicker on the screen.
- flicker flicker
- the display device 1 of Embodiment 2 can reduce power consumption while maintaining high quality of moving images.
- the display device 1 according to the second embodiment includes the number of scans of the blue display scanning signal line Gb having a smaller luminance ratio among red (R), green (G), and blue (B), and red display.
- a configuration is adopted in which the number of scans of the scanning signal line Gr is reduced. Accordingly, the display device 1 according to the embodiment has less change in luminance than a display device that employs a configuration in which the number of scans of the scan signal lines other than the scan signal line Gb and the scan signal line Gr is reduced. (Flickering) hardly occurs.
- the display device 1 reduces the capability of the signal line driving circuit 6 in both the horizontal scanning period in which the scanning signal line Gb is not scanned and the horizontal scanning period in which the scanning signal line Gr is not scanned. It was decided. Thereby, the display apparatus 1 of embodiment can reduce more power consumption compared with the display apparatus which does not employ
- Each horizontal scanning period is a period in which the screen is not rewritten. Therefore, even when this configuration is adopted, there is no influence on the quality of the moving image.
- the display device 1 provides a frame period during which the scanning signal line Gb is not scanned, so that the number of scanning of the scanning signal line Gb is smaller than that of the scanning signal line Gg and the scanning signal line Gr. . That is, the number of scans of the scan signal line Gb is reduced by thinning out the scan of the scan signal line Gb in the frame period.
- the number of scans of the scanning signal line Gr is made smaller than that of the scanning signal line Gg. That is, the number of scans of the scan signal line Gr is reduced by thinning out the scan of the scan signal line Gr in the frame period.
- the control signal for scanning the scanning signal line Gb (in the embodiment, the gate output control signal GOE) and the waveform of the control signal for scanning the scanning signal line Gr are scanned with the scanning signal line Gg. It is possible to realize a configuration in which the number of scans of the scanning signal line Gb and the scanning signal line Gr is reduced with a simple configuration in which the control signal is different from the control signal. For example, the scanning signal can be produced at a lower cost than in the case of employing another configuration in which one frame period of the scanning signal line Gb and one frame period of the scanning signal line Gr are different from one frame period of the scanning signal line Gg. A configuration in which the number of scans of the line Gb and the scanning signal line Gr is reduced can be realized.
- FIG. 11 is a diagram illustrating a frame period configuration when the display device performs a display operation. Note that in FIG. 11, a frame period with black circles is a frame period in which scanning of scanning signal lines is performed. On the other hand, a frame period in which white circles are given is a frame period in which scanning of scanning signal lines is not performed.
- FIG. 11A is a diagram showing a frame period configuration of the scanning signal line Gg employed in the display device 1 of the third embodiment.
- the refresh rate of the scanning signal line Gg is 60 Hz. Therefore, one frame period of the scanning signal line Gg is 16 ms.
- FIG. 11B is a diagram showing a frame period configuration of the scanning signal line Gr employed in the display device 1 of the third embodiment.
- the refresh rate of the scanning signal line Gr is 40 Hz.
- the one frame period of the scanning signal line Gr in FIG. 11B is 16 ms, similarly to the one frame period of the scanning signal line Gg. This is because the refresh rate of the scanning signal line Gg in FIG. 11B is set to 40 Hz by thinning out 1/3 of the number of frames of the scanning signal line Gg as a frame period during which the scanning signal line Gr is not scanned. Because.
- FIG. 11C is a diagram showing a frame period configuration of the scanning signal line Gr that is not employed in the display device 1 of the third embodiment.
- the refresh rate of the scanning signal line Gr is set to 40 Hz, as in FIG.
- one frame period of the scanning signal line Gr in FIG. 11C is 25 ms. This is because the refresh rate of the scanning signal line Gg in FIG. 11C is set to 40 Hz by providing one frame period different from the scanning signal line Gg without providing a frame in which scanning of the scanning signal line Gr is not performed. Because.
- the timing T3 in FIG. As shown, since the scanning signal line Gg and the scanning signal line Gb have different timings such as the start timing, end timing, and write timing of each frame period, the control of the plurality of scanning signal lines is performed.
- the circuit configuration becomes very complicated.
- the refresh rate of the scanning signal line Gb is changed without changing one frame period of the reference scanning signal line Gg as in the example of FIG. 11B employed in the display device 1 of the third embodiment.
- the timings T1 and T2 in FIG. 11 the timings such as the start timing, end timing, and write timing of each frame period are always set in the scanning signal line Gg and the scanning signal line Gb. Therefore, the circuit configuration for controlling the plurality of scanning signal lines can be simplified.
- a non-scanning period is provided for the scanning signal line Gb in the odd-numbered frame period. That is, for the scanning signal line Gb, a non-scanning period is provided every two frame periods.
- the pixel electrode on the scanning signal line G (3) is repeatedly applied with the positive voltage applied state and the voltage not applied state. Become. That is, the voltage applied to each pixel electrode on the scanning signal line G (3) is always a positive voltage.
- the display device 1 has the polarity of the scanning signal line G in which the non-scanning period is provided every two frame periods except for the frame period in which the non-scanning period is provided. Drive while inversion. Specifically, the scanning signal line Gb in which the non-scanning period is provided every two frame periods is driven while the polarity is inverted every frame period except for the odd frame period in which the non-scanning period is provided. did.
- the display operation by the display device 1 according to the third embodiment will be described with reference to FIGS.
- description is abbreviate
- the display operation by the display device 1 of the third embodiment is different from the display operation by the display device 1 of the first embodiment. For this reason, below, the point which is different from the display operation by the display apparatus 1 of Embodiment 1 among the display operations by the display apparatus 1 of Embodiment 3 is demonstrated.
- FIG. 12 is a diagram showing various signal waveforms in the first frame period.
- FIG. 13 is a diagram illustrating various signal waveforms in the second frame period.
- FIG. 14 is a diagram illustrating various signal waveforms in the third frame period.
- FIG. 15 is a diagram illustrating various signal waveforms in the fourth frame period.
- the display device 1 according to the third embodiment operates in the same manner as the display device 1 according to the first embodiment in that the number of scans of the scan signal line Gb is 1 ⁇ 2 of the number of scans of the scan signal line Gr and the scan signal line Gg.
- the scanning line driving circuit 4 scans any of the scanning signal line Gr, the scanning signal line Gg, and the scanning signal line Gb.
- the scanning line driving circuit 4 scans the scanning signal line Gr and the scanning signal line Gg in the same manner as in the even frame period.
- the signal line Gb is not scanned. That is, a non-scanning period during which scanning is not performed is provided for the scanning signal line Gb.
- the display device 1 excludes the odd-numbered frame period in which the non-scanning period is provided for the scanning signal line Gb in which the non-scanning period is provided every two frame periods (that is, , Focusing only on the even frame period), the polarity of the voltage applied to each pixel electrode on the scanning signal line G3 is inverted every frame period.
- each pixel electrode on the scanning signal line G (3) Is applied with a positive voltage.
- a negative voltage is applied to each pixel electrode on the scanning signal line G (3) in the second even frame period.
- the first even-numbered frame period and the second even-numbered frame period are repeated, so that a positive voltage is applied to each pixel electrode on the scanning signal line G3. And the state in which the voltage of the negative electrode is applied is repeated. That is, the voltage applied to each pixel electrode on the scanning signal line G (3) does not always become a constant voltage.
- each pixel electrode on the scanning signal line G (6) is applied to each pixel electrode.
- the negative voltage is applied.
- a positive voltage is applied to each pixel electrode on the scanning signal line G (6).
- the gate output control signal GOE is input to the scanning line driving circuit 4 from the timing controller 10 while being fixed at a high level, so that the scanning line driving circuit 4 does not perform scanning. This is the same as the display device 1 of the first embodiment. Further, the point that the signal line driving circuit 6 is stopped or the capacity is lowered in each non-scanning period is the same as the display device 1 of the first embodiment.
- the display device 1 according to the third embodiment has one frame period except for the frame period in which the non-scanning period is provided for the scanning signal line Gr in which the non-scanning period is provided every two frame periods. A configuration in which the polarity is reversed every time driving is adopted. As a result, according to the display device 1 of the third embodiment, the voltage applied to each pixel electrode on the scanning signal line Gr does not always become a constant voltage. Occurrence can be prevented.
- the display device 1 according to the third embodiment is the same as the display device 1 according to the first embodiment except for the points described above. For this reason, the display device 1 of the third embodiment can achieve the same effects as the display device 1 of the first embodiment.
- the number of scans of the scan signal line of the specific color scan signal line G is reduced for the entire area of the screen.
- the present invention is not limited to this, and the number of scans of the scan signal line G of the specific color may be reduced for a partial region of the screen.
- the display panel 2 divides the screen into upper and lower halves, the upper area is a moving image display area, and the lower area is a still image display area.
- the still image display area in order to prioritize lower power consumption, the number of scans of the scan signal line of the scan signal line G of the specific color is reduced.
- the moving image display area since higher image quality is prioritized, the number of scans of the scan signal line of the scan signal line G of the specific color is not reduced.
- FIG. 16 and 17 are diagrams illustrating various signal waveforms used when performing a display operation by the display device 1 according to the fourth embodiment.
- FIG. 16 is a diagram showing various signal waveforms in the even frame period.
- FIG. 17 is a diagram showing various signal waveforms in the odd-numbered frame period.
- the display device 1 according to the fourth embodiment is different from the still image display region in that the number of scans of the scan signal line Gb is 1 ⁇ 2 of the number of scans of the scan signal line Gr and the scan signal line Gg. 1 operates in the same manner as the display device 1 of FIG. Specifically, as shown in FIG. 16, in the even-numbered frame period, the scanning line driving circuit 4 scans all of the scanning signal line Gr, the scanning signal line Gg, and the scanning signal line Gb. On the other hand, as shown in FIG. 17, in the odd frame period, the scanning line driving circuit 4 scans the scanning signal line Gr and the scanning signal line Gg in the same manner as in the even frame period. Gb is not scanned. That is, a non-scanning period during which scanning is not performed is provided for the scanning signal line Gb.
- the display device 1 of the fourth embodiment performs an operation different from that of the display device 1 of the first embodiment in that the number of scans of the scanning signal line Gb is not reduced for the moving image display area.
- the scanning line driving circuit 4 scans all of the scanning signal line Gr, the scanning signal line Gg, and the scanning signal line Gb.
- the scanning line driving circuit 4 scans any of the scanning signal line Gr, the scanning signal line Gg, and the scanning signal line Gb.
- the gate output control signal GOE is input to the scanning line driving circuit 4 from the timing controller 10 while being fixed at a high level, so that the scanning line driving circuit 4 does not perform scanning. This is the same as the display device 1 of the first embodiment. Further, the point that the signal line driving circuit 6 is stopped or the capacity is lowered in each non-scanning period is the same as the display device 1 of the first embodiment.
- the power consumption when the display device 1 performs the conventional display operation will be described.
- the power consumption of the signal line driving circuit 6 is about 88 mW
- the power consumption of the scanning line driving circuit 4 is about 8.1 mW.
- the display device 1 has a 1 / of the total horizontal scanning period out of the half frame period for the still image display area occupying half of the screen.
- the scanning line driving circuit 4 and the signal line driving circuit 6 are in a non-operating state.
- the display device 1 according to the embodiment brings about an effect of reducing the power consumption by about 8.3% as the power consumption of the signal line driving circuit 6.
- the display device 1 according to the embodiment brings about an effect of reducing the power consumption by about 8.3% as the power consumption of the scanning line driving circuit 4.
- the display device 1 reduces the number of scans of the scanning signal line Gb for the still image display region and reduces the number of scans of the scanning signal line Gb for the moving image display region. It was decided not to. Thereby, about a still image display area, power consumption can be reduced, maintaining the high quality of a moving image. In addition, for the moving image display area, the moving image can be of higher quality.
- the fourth embodiment When there is a display area where higher image quality is to be prioritized as in the fourth embodiment, a configuration in which the number of scans of a specific scanning signal line is reduced in that area may be adopted.
- the area where the number of scans of a specific scanning signal line is reduced is not limited to the moving image display area. Further, the region where the number of scans of a specific scanning signal line is reduced is not limited to the upper part of the screen.
- the display panel 2 has been described using a horizontal stripe arrangement (that is, one display color arranged in one pixel row), but is not limited thereto.
- the display panel 2 may be one in which a plurality of display colors are arranged in one pixel row. Therefore, in the fifth embodiment, an example in which a display panel 2 in which a plurality of display colors are arranged in one pixel row will be described.
- FIG. 18 is a diagram illustrating an array of pixel display colors of the display panel 2 included in the display device 1.
- FIG. 18A is a diagram showing an array of pixel display colors of the display panel 2 included in the display device 1 of the first to fourth embodiments.
- FIG. 18B is a diagram illustrating an array of pixel display colors of the display panel 2 included in the display device 1 according to the fifth embodiment.
- each pixel row is provided with pixels of one specific display color arranged in a straight line.
- the first pixel row G (1) is a pixel row (hereinafter, referred to as “pixel row Gr”) in which pixels (R) whose display color is red are arranged in a straight line. is there.
- a scanning signal line Gr is connected to each pixel in the pixel row Gr.
- the second pixel row G (2) is a pixel row (hereinafter, referred to as “pixel row Gg”) in which pixels (G) whose display color is green are arranged in a straight line.
- a scanning signal line Gg is connected to each pixel in the pixel row Gg.
- the third pixel row G (3) is a pixel row (hereinafter, referred to as “pixel row Gb”) in which pixels (B) whose display color is blue are arranged in a straight line.
- a scanning signal line Gb is connected to each pixel of the pixel row Gb.
- a plurality of pixel rows are provided on the display panel 2 in the order of the pixel row Gr, the pixel row Gg, and the pixel row Gb.
- pixels of two specific display colors are arranged in a straight line in each pixel row.
- pixels (R) whose display color is red and pixels (B) whose display color is blue are alternately arranged in a straight line.
- pixel row Grb pixels whose display color is red and pixels (B) whose display color is blue
- a scanning signal line Grb is connected to each pixel of the pixel row Grb.
- the second pixel row G (2) is a pixel row in which pixels (G) whose display color is green and pixels (W) whose display color is white are alternately arranged in a straight line.
- a scanning signal line Gwg is connected to each pixel in the pixel row Gwg. Thereafter, a plurality of pixel rows are provided on the display panel 2 in the order of the pixel row Grb and the pixel row Gwg.
- FIG. 19 and 20 are diagrams illustrating various signal waveforms used when performing a display operation by the display device 1 according to the fifth embodiment.
- FIG. 19 is a diagram showing various signal waveforms in the even frame period.
- FIG. 20 is a diagram showing various signal waveforms in the odd-numbered frame period.
- the display device 1 of the fifth embodiment is the same as the display device 1 of the first embodiment in that the scanning signal line of a specific color is scanned less times than the scanning signal lines of other colors.
- the display device 1 of the fifth embodiment is different from the display device 1 of the first embodiment in the arrangement of the pixel display colors of the display panel 2.
- the display device 1 according to the fifth embodiment is different from the display device 1 according to the first embodiment in the number of scanning signal lines for reducing the number of scans.
- the scanning signal line Grb for driving the pixel row Grb has a smaller number of scans than the scanning signal line Gwg for driving the pixel row Gwg.
- the scanning line driving circuit 4 scans both the scanning signal line Grb and the scanning signal line Gwg.
- the scanning line driving circuit 4 scans the scanning signal line Gwg in the same manner as the even frame, but scans the scanning signal line Grb. Not performed. That is, a non-scanning period during which scanning is not performed is provided for the scanning signal line Grb.
- the display device 1 according to the fifth embodiment sets the number of scans of the scan signal line Grb to 1 ⁇ 2 of the number of scans of the scan signal line Gwg.
- the refresh rate of the scanning signal line Gwg is 60 Hz, so the refresh rate of the scanning signal line Grb is 30 Hz.
- the gate output control signal GOE is input to the scanning line driving circuit 4 from the timing controller 10 while being fixed at a high level, so that the scanning line driving circuit 4 does not perform scanning. This is the same as the display device 1 of the first embodiment. Further, the point that the signal line driving circuit 6 is stopped or the capacity is lowered in each non-scanning period is the same as the display device 1 of the first embodiment.
- the power consumption when the display device 1 performs the conventional display operation will be described.
- the power consumption of the signal line driving circuit 6 is about 88 mW
- the power consumption of the scanning line driving circuit 4 is about 8.1 mW.
- the display device 1 scans in the non-scanning period of the scanning signal line Grb, which occupies 1/2 of the entire horizontal scanning period, out of the 1/2 frame period of the entire frame period.
- the line driving circuit 4 and the signal line driving circuit 6 are in a non-operating state.
- the display device 1 according to the embodiment brings about an effect of reducing power consumption by 25% as the power consumption of the signal line driving circuit 6.
- the display device 1 of the embodiment brings about an effect of reducing the power consumption by about 26% as the power consumption of the scanning line driving circuit 4.
- the display device 1 according to the fifth embodiment uses the number of scans of the scanning signal lines for display of a specific plurality of colors among the plurality of scanning signal lines G as the scanning signal for display of other colors. A configuration that uses fewer lines is adopted. Thereby, the display apparatus 1 of Embodiment 5 can reduce power consumption as mentioned above compared with the conventional display apparatus which does not employ
- the display device 1 according to the fifth embodiment includes the blue and red display scanning signal lines Grb having a smaller luminance ratio among red (R), green (G), blue (B), and white (W).
- a configuration that reduces the number of scans is adopted.
- the display device 1 according to the fifth embodiment has less change in luminance than a display device that employs a configuration in which the number of scanning signal lines for displaying colors other than blue and red is reduced. (Flickering) hardly occurs.
- the display device is configured so that at least some component causes “the number of scans of a scan signal line for display of a specific color out of a plurality of scan signal lines to the scan signal for display of another color”.
- the configuration of the display device described in the embodiment, the display operation by the display device, and the like are not limited to those described in each embodiment. You may make it implement with a change.
- Modification 1 Scanning signal line to reduce the number of scans
- the number of scans of the scan signal line that drives the blue pixels is reduced.
- the number of scans of the scan signal lines that drive the pixels of other colors may be reduced.
- the number of scans of the scan signal line that drives the red or green pixel may be reduced.
- the number of scans of the scan signal line that drives the blue pixel and the scan signal line that drives the red pixel is reduced.
- the number of scans of the scan signal line that drives the pixels of other colors is reduced. You may make it reduce.
- the number of scans of the scanning signal line that drives the blue pixel and the scanning signal line that drives the green pixel may be reduced, the scanning signal line that drives the red pixel, The number of scans of the scan signal line for driving the pixel may be reduced.
- the number of scans of the scan signal lines that drive the blue and red pixels is reduced, but the number of scans of the scan signal lines that drive the pixels of other colors may be reduced.
- the number of scans of the scan signal lines that drive the white and green pixels may be reduced.
- the number of operations of all the scanning signal lines among the plurality of scanning signal lines for driving the pixels of a certain color is reduced.
- a plurality of scanning signals for driving the pixels of a certain color are used. It is also possible to reduce the number of operations of some scanning signal lines among the lines. For example, in the first embodiment, the number of operations of all the scanning signal lines Gb among the plurality of scanning signal lines Gb that drive blue pixels is reduced, but the number of operations of some scanning signal lines Gb is reduced. It's also good.
- the number of operations of all the scanning signal lines among a plurality of scanning signal lines that drive a certain color pixel is reduced for a part of the screen. It is also possible to reduce the number of operations of some of the scanning signal lines among the plurality of scanning signal lines that drive pixels of a certain color with respect to the region. For example, in the fourth embodiment, for the still image display area, the number of operations of all the scanning signal lines Gb among the plurality of scanning signal lines Gb for driving the blue pixels is reduced. The number of operations of the scanning signal line Gb may be reduced.
- the amount of operation of the scanning line driving circuit 4 can be reduced, so that the object of low power can be achieved.
- the display quality of moving images can be maintained rather than a configuration in which the number of scans for all colors is reduced.
- the pixel display color arrangement of the display panel is various.
- the number of scans of the scan signal line that drives the pixels of an appropriate color may be reduced according to the arrangement of the pixel display colors of the display panel.
- the signal line driving circuit 6 is in a non-operating state during the non-scanning period. Not only this but the signal line drive circuit 6 is good also as an operation state. Even in this case, at least the amount of operation of the scanning line driving circuit 4 can be reduced, so that the object of low power can be achieved. Note that when the signal line driver circuit 6 is in an operating state, it is preferable to reduce at least the capability of the signal line driver circuit 6. Thereby, the power can be further reduced.
- all the analog amplifiers in the signal line driving circuit 6 are set to the non-operating state.
- at least one of the analog amplifiers may be set to the non-operating state. Even in this case, the effect of reducing power consumption can be obtained.
- the target of the non-operating state in the non-scanning period is not limited to the analog amplifier. That is, the capability of any circuit group (element group) through which steady current flows, including an analog amplifier, may be reduced.
- Examples of such a circuit group include a DAC (Digital-Analogue-Converter) circuit unit that determines a voltage for each gradation, a Vdd generation circuit unit, and the like.
- the display device includes a display panel having a plurality of scanning signal lines and a plurality of data signal lines, a scanning line driving circuit that sequentially selects and scans the plurality of scanning signal lines, and a selection.
- a signal line driving circuit that supplies a data signal from the plurality of data signal lines to each pixel on the scanning signal line, and a plurality of pixels for displaying a specific color among all the scanning signal lines.
- the number of scans per unit time of the first scan signal line, which is at least one of the scan signal lines, is smaller than that of the scan signal lines for displaying other colors.
- the first scanning signal line is preferably a scanning signal line for driving a pixel row in which blue display pixels are arranged in a straight line.
- the first scanning signal line may be a scanning signal line for driving a pixel row in which blue display pixels and red display pixels are arranged in a straight line. It is preferable that
- the number of scans of the blue and red display scanning signal lines having a smaller luminance ratio is reduced, so that there is little change in luminance due to the reduced number of scans, and flicker occurs on the screen. Hateful.
- the first scanning signal line is scanned, and a frame period during which the first scanning signal line is not scanned is provided. It is preferable that the number of scans of the scan signal line is less than that of the other color display scan signal lines.
- the control signal waveform for scanning the scanning signal line for reducing the number of scans is simply different from the control signal for scanning the scanning signal line for which the number of scanning times is not reduced.
- a configuration in which the number of scans of the scan signal line is reduced can be realized. For example, it is possible to reduce the cost of the scanning signal line at a lower cost than adopting another configuration such as making one frame period of the scanning signal line that reduces the number of scannings different from one frame period of the scanning signal line that does not reduce the number of scannings. A configuration that reduces the number of scans can be realized.
- the first scanning signal line is driven while the polarity is inverted every predetermined number of frame periods except for a frame period in which scanning is not performed.
- the capability of the signal line driving circuit is reduced in a horizontal scanning period in which the scanning of the first scanning signal line is not performed.
- the second scanning which is at least one of a plurality of scanning signal lines for displaying a specific color among all the scanning signals for displaying the other colors. It is preferable that the number of scans per unit time of the signal line is smaller than that of the other scan signal lines for displaying colors.
- the current consumption of the scanning line driving circuit can be further reduced.
- flicker flicker
- the display panel has a plurality of display regions, and the display device includes the first scanning signal line in a part of the plurality of display regions.
- the number of scans per unit time is less than that of the other color display scanning signal lines.
- the driving method includes a display panel having a plurality of scanning signal lines and a plurality of data signal lines, a scanning line driving circuit that sequentially selects and scans the plurality of scanning signal lines, and the selected scanning.
- a display device driving method comprising a signal line driving circuit for supplying a data signal from the plurality of data signal lines to each pixel on a signal line, wherein a specific color of all the scanning signal lines The number of scans per unit time of the first scan signal line, which is at least one of the plurality of display scan signal lines, is smaller than that of the other color display scan signal lines. To do.
- the display device according to the present invention can be widely used as various display devices such as liquid crystal display devices, organic EL display devices, and electronic paper.
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Abstract
Description
まず、本発明の実施形態1について説明する。実施形態1に係る表示装置(液晶表示装置)1の構成について、図1を参照して説明する。図1は、実施形態1に係る表示装置1の全体構成を示す図である。この図に示すように、表示装置1は、表示パネル2、走査線駆動回路(ゲートドライバ)4、信号線駆動回路(ソースドライバ)6、共通電極駆動回路8、タイミングコントローラ10、および電源生成回路13を備えている。
ここで、従来の表示動作について説明する。ここでは、図1で説明した表示装置1に、従来の表示動作を行わせた場合を例に説明する。図2は、従来の表示動作を行う際に用いられる各種信号波形を示す図である。
ここで、実施形態1に係る表示装置1による表示動作について説明する。図3および図4は、実施形態1に係る表示装置1による表示動作を行う際に用いられる各種信号波形を示す図である。このうち、図4は、偶数フレーム期間における各種信号波形を示す図である。一方、図5は、奇数フレーム期間における各種信号波形を示す図である。
実施形態1の表示装置1は、特定の色の走査信号線については、他の色の走査信号線よりも走査回数を少なくする点で、図2で説明した表示動作と異なる。例えば、実施形態1では、走査信号線Gbについては、走査信号線Grおよび走査信号線Ggよりも、走査回数を少なくしている。
ここで、上記したとおり、実施形態1の表示装置1は、非走査期間においては、走査信号線Gbに対しては走査を行わない。したがって、非走査期間においては、信号線駆動回路6を動作させる必要はない。そこで、実施形態1の表示装置1は、当該表示装置1の消費電力をより軽減すべく、非走査期間においては、信号線駆動回路6を停止または低能力化する。
ここで、実施形態1の表示装置1による消費電力の軽減効果について説明する。ここでは、一例として、表示装置1の解像度が1366×768である場合について説明する。
以上のように、実施形態1の表示装置1は、複数の走査信号線Gのうちの、ある特定色の表示用の走査信号線の走査回数を、他の色の表示用の走査信号線よりも少なくする構成を採用している。これにより、実施形態1の表示装置1は、上記構成を採用しない従来の表示装置に比べ、上記したように、消費電力を低減することができる。
次に、本発明の実施形態2について説明する。実施形態1では、走査信号線Grおよび走査信号線Ggの走査回数よりも、走査信号線Gbの走査回数を少なくすることとした。具体的には、実施形態1では、走査信号線Grおよび走査信号線Ggの走査回数を60回とし、走査信号線Gbの走査回数を30回とした。
図5~図10は、実施形態2に係る表示装置1による表示動作を行う際に用いられる各種信号波形を示す図である。このうち、図5は、1番目のフレーム期間における各種信号波形を示す図である。また、図6は、2番目のフレーム期間における各種信号波形を示す図である。また、図7は、3番目のフレーム期間における各種信号波形を示す図である。また、図8は、4番目のフレーム期間における各種信号波形を示す図である。また、図9は、5番目のフレーム期間における各種信号波形を示す図である。また、図10は、6番目のフレーム期間における各種信号波形を示す図である。
実施形態2の表示装置1は、実施形態1では走査回数を減らさなかった他の色の走査信号線のうち、特定の色の走査信号線については、さらなる他の色の走査信号線よりも走査回数を少なくする点で、実施形態1の表示装置1と異なる。例えば、実施形態1では、走査信号線Gbについては、走査信号線Grおよび走査信号線Ggよりも、走査回数を少なくしていた。さらに、実施形態2では、走査信号線Grについては、走査信号線Ggよりも、走査回数を少なくしている。
ここで、実施形態2の表示装置1による消費電力の軽減効果について説明する。ここでは、実施形態1と同様に、表示装置1の解像度が1366×768である場合について説明する。
以上のように、実施形態2の表示装置1は、複数の走査信号線Gのうちの、ある特定色の表示用の走査信号線の走査回数を、他の色の表示用の走査信号線よりも少なくするとともに、他の色の表示用の走査信号線のうちの、ある特定色の表示用の走査信号線の走査回数を、さらなる他の色の表示用の走査信号線よりも少なくする構成を採用している。これにより、実施形態の表示装置1は、上記構成を採用しない従来の表示装置に比べ、上記したように、より多くの消費電力を低減することができる。
次に、本発明の実施形態3について説明する。実施形態1では、表示装置1は、1フレーム期間毎に、各データ信号線Sに印加される電圧の極性を反転させていると説明した。この場合、ある走査信号線Gに対して2フレーム期間ごとに非走査期間が設けられていると、この走査信号線G上の各画素電極に印加される電圧の極性は常に一定となってしまう。
図12~15は、実施形態3に係る表示装置1による表示動作を行う際に用いられる各種信号波形を示す図である。このうち、図12は、1番目のフレーム期間における各種信号波形を示す図である。また、図13は、2番目のフレーム期間における各種信号波形を示す図である。また、図14は、3番目のフレーム期間における各種信号波形を示す図である。また、図15は、4番目のフレーム期間における各種信号波形を示す図である。
以上のように、実施形態3の表示装置1は、2フレーム期間毎に非走査期間が設けられた走査信号線Grに対しては、非走査期間が設けられたフレーム期間を除き、1フレーム期間毎に極性反転させながら駆動する構成を採用した。これにより、実施形態3の表示装置1によれば、走査信号線Gr上の各画素電極に印加される電圧が、常に一定の電圧になってしまうようなことがないため、焼き付き等の不具合の発生を防止することができる。
次に、本発明の実施形態4について説明する。実施形態1~3では、画面の全領域に対して、特定色の走査信号線Gの走査信号線の走査回数を減らすこととした。これに限らず、画面の一部の領域に対して、特定色の走査信号線Gの走査信号線の走査回数を減らすようにしても良い。
図16,17は、実施形態4に係る表示装置1による表示動作を行う際に用いられる各種信号波形を示す図である。このうち、図16は、偶数フレーム期間における各種信号波形を示す図である。また、図17は、奇数フレーム期間における各種信号波形を示す図である。
ここで、実施形態4の表示装置1による消費電力の軽減効果について説明する。ここでは、実施形態1と同様に、表示装置1の解像度が1366×768である場合について説明する。
次に、本発明の実施形態5について説明する。実施形態1~4では、表示パネル2として、横ストライプ配列が採用されたもの(すなわち、1画素行に1つの表示色が配置されたもの)を用いて説明したが、これに限らない。例えば、表示パネル2として、1画素行に複数の表示色が配置されたものを採用しても良い。そこで、実施形態5では、表示パネル2として、1画素行に複数の表示色が配置されたものを採用する例を説明する。
図18は、表示装置1が備える表示パネル2の画素表示色の配列を示す図である。図18(a)は、実施形態1~4の表示装置1が備える表示パネル2の画素表示色の配列を示す図である。図18(b)は、実施形態5の表示装置1が備える表示パネル2の画素表示色の配列を示す図である。
ここで、実施形態5に係る表示装置1による表示動作について説明する。図19および図20は、実施形態5に係る表示装置1による表示動作を行う際に用いられる各種信号波形を示す図である。このうち、図19は、偶数フレーム期間における各種信号波形を示す図である。一方、図20は、奇数フレーム期間における各種信号波形を示す図である。
ここで、実施形態5の表示装置1による消費電力の軽減効果について説明する。ここでは、実施形態1と同様に、表示装置1の解像度が1366×768である場合について説明する。
以上のように、実施形態5の表示装置1は、複数の走査信号線Gのうちの、ある特定の複数色の表示用の走査信号線の走査回数を、他の色の表示用の走査信号線よりも少なくする構成を採用している。これにより、実施形態5の表示装置1は、上記構成を採用しない従来の表示装置に比べ、上記したように、消費電力を低減することができる。また、全ての走査信号線の走査回数を少なくする構成を採用した従来の表示装置に比べ、画面上におけるフリッカ(ちらつき)が生じにくいうえ、動画を滑らかに表示することができる。すなわち、実施形態5の表示装置1は、動画の高品位を保持しつつ、消費電力を低減することができるのである。
本発明は上述した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る。すなわち、請求項に示した範囲で適宜変更した技術的手段を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。
実施形態1,3,4では、青色の画素を駆動する走査信号線の走査回数を減らすこととしたが、他の色の画素を駆動する走査信号線の走査回数を減らすようにしてもよい。例えば、実施形態1,3,4のいずれかにおいて、赤色または緑色の画素を駆動する走査信号線の走査回数を減らすようにしてもよい。
実施形態1~5では、非走査期間では、信号線駆動回路6を非動作状態とした。これに限らず、信号線駆動回路6を動作状態としても良い。この場合でも、少なくとも走査線駆動回路4の動作量を減らすことができるため、低電力化という目的を達成することができる。なお、信号線駆動回路6を動作状態とした場合、好ましくは、少なくとも信号線駆動回路6の能力を低減すればよい。これにより、より低電力化することができる。
以上のように、本発明に係る表示装置は、複数の走査信号線および複数のデータ信号線を有する表示パネルと、前記複数の走査信号線を順次選択して走査する走査線駆動回路と、選択された走査信号線上の各画素に対し、前記複数のデータ信号線からデータ信号を供給する信号線駆動回路とを備え、全ての前記走査信号線のうちの、ある特定色の表示用の複数の走査信号線のうちの少なくともいずれかである第1の走査信号線の単位時間あたりの走査回数を、他の色の表示用の走査信号線よりも少なくしたことを特徴とする。
2 表示パネル
4 走査線駆動回路
6 信号線駆動回路
8 共通電極駆動回路
10 タイミングコントローラ
Claims (10)
- 複数の走査信号線および複数のデータ信号線を有する表示パネルと、
前記複数の走査信号線を順次選択して走査する走査線駆動回路と、
選択された走査信号線上の各画素に対し、前記複数のデータ信号線からデータ信号を供給する信号線駆動回路と
を備え、
全ての前記走査信号線のうちの、ある特定色の表示用の複数の走査信号線のうちの少なくともいずれかである第1の走査信号線の単位時間あたりの走査回数を、他の色の表示用の走査信号線よりも少なくした
ことを特徴とする表示装置。 - 前記第1の走査信号線は、
青色の表示用の画素が直線状に並べて設けられた画素行を駆動するための走査信号線である
ことを特徴とする請求項1に記載の表示装置。 - 前記第1の走査信号線は、
青色の表示用の画素および赤色の表示用の画素が直線状に並べて設けられた画素行を駆動するための走査信号線である
ことを特徴とする請求項1に記載の表示装置。 - 前記他の色の表示用の走査信号線の走査を行い、かつ前記第1の走査信号線の走査を行わないフレーム期間を設けたことにより、前記第1の走査信号線の単位時間あたりの走査回数を、前記他の色の表示用の走査信号線よりも少なくした
ことを特徴とする請求項1から3のいずれか一項に記載の表示装置。 - 前記第1の走査信号線に対しては、走査を行わないフレーム期間を除き、所定数のフレーム期間毎に極性反転させながら駆動する
ことを特徴とする請求項4に記載の表示装置。 - 前記第1の走査信号線の走査を行わない水平走査期間においては、前記信号線駆動回路の能力を低下させる
ことを特徴とする請求項1から5のいずれか一項に記載の表示装置。 - 全ての前記他の色の表示用の走査信号線のうち、ある特定色の表示用の複数の走査信号線のうちの少なくともいずれかである第2の走査信号線の単位時間あたりの走査回数を、さらなる他の色の表示用の走査信号線よりも少なくした
ことを特徴とする請求項1から6のいずれか一項に記載の表示装置。 - 前記第1の走査信号線に対しては、2フレーム期間毎に、走査を行わないフレーム期間を設け、前記第2の走査信号線に対しては、3フレーム期間毎に、走査を行わないフレーム期間を設けた
ことを特徴とする請求項7に記載の表示装置。 - 前記表示パネルは、
複数の表示領域を有し、
当該表示装置は、
前記複数の表示領域のうちの一部の表示領域において、前記第1の走査信号線の単位時間あたりの走査回数を、前記他の色の表示用の走査信号線よりも少なくした
ことを特徴とする請求項1から8のいずれか一項に記載の表示装置。 - 複数の走査信号線および複数のデータ信号線を有する表示パネルと、前記複数の走査信号線を順次選択して走査する走査線駆動回路と、選択された走査信号線上の各画素に対し、前記複数のデータ信号線からデータ信号を供給する信号線駆動回路とを備えた表示装置の駆動方法であって、
全ての前記走査信号線のうちの、ある特定色の表示用の複数の走査信号線のうちの少なくともいずれかである第1の走査信号線の単位時間あたりの走査回数を、他の色の表示用の走査信号線よりも少なくした
ことを特徴とする駆動方法。
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JPWO2014050316A1 (ja) * | 2012-09-28 | 2016-08-22 | シャープ株式会社 | 液晶表示装置およびその駆動方法 |
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KR102280009B1 (ko) * | 2017-05-24 | 2021-07-21 | 삼성전자주식회사 | 지그재그 연결 구조를 갖는 디스플레이 패널 및 이를 포함하는 디스플레이 장치 |
CN115762413B (zh) * | 2022-08-19 | 2024-07-16 | 武汉天马微电子有限公司 | 显示面板及显示装置 |
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WO2011114583A1 (ja) * | 2010-03-19 | 2011-09-22 | シャープ株式会社 | 表示装置および表示駆動方法 |
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JPWO2014050316A1 (ja) * | 2012-09-28 | 2016-08-22 | シャープ株式会社 | 液晶表示装置およびその駆動方法 |
CN103869514A (zh) * | 2012-12-10 | 2014-06-18 | 乐金显示有限公司 | 液晶显示装置及其驱动方法 |
CN103869514B (zh) * | 2012-12-10 | 2017-03-01 | 乐金显示有限公司 | 液晶显示装置及其驱动方法 |
JP2017173809A (ja) * | 2016-03-17 | 2017-09-28 | 株式会社半導体エネルギー研究所 | 表示装置、表示モジュール、および電子機器 |
US11049468B2 (en) | 2016-03-17 | 2021-06-29 | Semiconductor Energy Laboratory Co., Ltd. | Display device, display module, and electronic device |
JP7066324B2 (ja) | 2016-03-17 | 2022-05-13 | 株式会社半導体エネルギー研究所 | 表示装置、表示モジュール、および電子機器 |
JP2017173415A (ja) * | 2016-03-22 | 2017-09-28 | 株式会社ジャパンディスプレイ | 表示装置及び表示装置の制御方法 |
US10431177B2 (en) | 2016-03-22 | 2019-10-01 | Japan Display Inc. | Display apparatus and control method for the same |
Also Published As
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JP5373209B2 (ja) | 2013-12-18 |
JPWO2012108361A1 (ja) | 2014-07-03 |
KR20140040699A (ko) | 2014-04-03 |
KR101548845B1 (ko) | 2015-08-31 |
US9299316B2 (en) | 2016-03-29 |
US20130307884A1 (en) | 2013-11-21 |
CN103348405A (zh) | 2013-10-09 |
CN103348405B (zh) | 2015-11-25 |
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