WO2016189596A1 - Display device - Google Patents

Display device Download PDF

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Publication number
WO2016189596A1
WO2016189596A1 PCT/JP2015/064800 JP2015064800W WO2016189596A1 WO 2016189596 A1 WO2016189596 A1 WO 2016189596A1 JP 2015064800 W JP2015064800 W JP 2015064800W WO 2016189596 A1 WO2016189596 A1 WO 2016189596A1
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Prior art keywords
gradation value
video
pixel
input
video signal
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PCT/JP2015/064800
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French (fr)
Japanese (ja)
Inventor
亮 山川
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堺ディスプレイプロダクト株式会社
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Priority to PCT/JP2015/064800 priority Critical patent/WO2016189596A1/en
Publication of WO2016189596A1 publication Critical patent/WO2016189596A1/en

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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
    • 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

Definitions

  • the video signal flowing through the video signal line changes from the previous video signal to a video signal in which the previous video signal and the target video signal are superimposed, and eventually converges to the target video signal.
  • the video signal is a rectangular wave signal
  • waveform rounding may occur due to superposition with the preceding video signal.
  • the second correction unit may reduce the gradation value corrected by the first correction unit as the pixel electrode corresponding to the target pixel is closer to the video input unit, and the target pixel.
  • the pixel electrode corresponding to is corrected higher as it is farther from the video input unit.
  • the second correction unit uses the corrected gradation value after the correction by the first correction unit. If the pixel electrode corresponding to the target pixel is lower than the value and far from the video input unit, the corrected gradation value is corrected to be higher than the corrected gradation value by the first correction unit. It is characterized by that.
  • the gradation value of the target pixel is subjected to two-stage correction by the first correction unit and the second correction unit.
  • the first correction unit corrects the gradation value of the pixel of interest based on the input gradation value of the pixel of interest and the input gradation value of the preceding pixel.
  • waveform rounding caused by the difference between the input gradation value of the target pixel and the input gradation value of the preceding pixel is suppressed.
  • the second correction unit further corrects the corrected gradation value of the target pixel.
  • the tone value after correction by the first correction unit is lower than the input tone value of the target pixel. Accordingly, when the amplitude of the video signal given to the target pixel tends to increase due to the influence of the video signal given to the previous stage pixel, the amplitude of the video signal can be appropriately reduced.
  • the gradation value after correction by the second correction unit is lower than the gradation value after correction by the first correction unit.
  • the gradation value corrected by the second correction unit is higher than the gradation value corrected by the first correction unit.
  • the amplitude of the video signal must correspond to the gradation value after correction by the second correction unit, but if the waveform is rounded in the video signal, the amplitude of the video signal corresponds to the gradation value after correction.
  • the amplitude is smaller (or larger) than the amplitude A.
  • the amplitude of the video signal converges to the amplitude A over time. Therefore, if a video signal with a large waveform rounding is applied to the pixel electrode early and a video signal with a small waveform rounding is applied to the pixel electrode later, a video signal having an amplitude A is applied to each pixel electrode for a necessary and sufficient time. It is done.
  • FIG. 1 is a block diagram showing a configuration of a display device 2 according to Embodiment 1 of the present invention.
  • 2 is a block diagram showing a connection relationship between the pixel electrodes 14, 14,... Included in the display device 2 and the video signal lines 11, 11,... And the scanning signal lines 12, 12,.
  • FIG. 3 is a block diagram illustrating a configuration of a control system of the display device 2.
  • the display device 2 of the present embodiment is configured as a television receiver or a display of a personal computer.
  • the display device 2 displays a full-color image using, for example, RGB (Red, Green, Blue) three primary colors.
  • the display device 2 is not limited to the three primary colors RGB, but may be the four primary colors RGBY (Red, Green, Blue, Yellow) or the four primary colors RGBW (Red, Green, Blue, White).
  • the liquid crystal display panel 1 includes two light-transmitting substrates disposed facing each other in the front-rear direction, and liquid crystal sealed between the light-transmitting substrates (each illustrated).
  • M video signal lines 11, 11,..., N scanning signal lines 12, 12,..., ⁇ M ⁇ N ⁇ TFTs 13, 13,. And ⁇ M ⁇ N ⁇ pixel electrodes 14, 14,... are provided on one side of the transparent substrate.
  • a transparent electrode layer (not shown) is provided on the other side of the translucent substrate.
  • FIG. 2 in order to distinguish the video signal lines 11, 11,... And the scanning signal lines 12, 12,. L2, ... are attached.
  • FIG. 2 in order to distinguish the TFTs 13, 13,... And the pixel electrodes 14, 14,. ... is attached.
  • the TFT 13 is represented by a letter “T”.
  • the image displayed on the liquid crystal display panel 1 includes pixels corresponding to the pixel electrodes 14, 14. Each pixel has an output gradation value of R color, G color, or B color. The output gradation value of each pixel corresponds to the amplitude of the video signal applied to the pixel electrode 14 corresponding to the pixel. 2 and 3, the pixel electrode 14 corresponding to the R (or G or B) pixel is represented by the letter “R” (or “G” or “B”).
  • R or G or B
  • the output gradation value of each pixel included in the image is equal to the input gradation value of each pixel included in the image to be originally displayed.
  • Each gradation value is an integer from “0” to “255”.
  • the video signal lines 11, 11,... are juxtaposed at an appropriate distance in the left-right direction (the width direction of the liquid crystal display panel 1).
  • Each video signal line 11 is long in the vertical direction (the height direction of the liquid crystal display panel 1).
  • the video signal lines 11 L1 , 11 L2 ,... are arranged in this order from the left.
  • the scanning signal lines 12, 12,... are juxtaposed at an appropriate distance in the vertical direction.
  • Each scanning signal line 12 is long in the left-right direction, and crosses the M video signal lines 11, 11,. In other words, the video signal lines 11, 11,... And the scanning signal lines 12, 12,.
  • the scanning signal lines 12 L1 , 12 L2 ,... are arranged in this order from the top.
  • the TFTs 13, 13,... are arranged in the vicinity of the intersections one by one corresponding to the intersections of the video signal lines 11, 11,.
  • Each TFT 13 is a switching element and is connected to the video signal line 11 and the scanning signal line 12 at the intersection.
  • the source electrode (and gate electrode) of the TFT 13 is connected to the video signal line 11 (and scanning signal line 12).
  • TFTs 13 11 , 13 12 ,... (And TFTs 13 21 , 13 22 ,...) Are arranged in this order from above and connected to the video signal line 11 L1 (and video signal line 11 L2 ). Yes.
  • the TFTs 13 11 , 13 12 ,... are individually connected to the scanning signal lines 12 L1 , 12 L2,.
  • the TFTs 13 21 , 13 22 are individually connected to the scanning signal lines 12 L1 , 12 L2,.
  • the pixel electrodes 14, 14,... are arranged in a matrix and are connected to the drain electrodes of the TFTs 13, 13,. That is, the pixel electrode 14 is connected to the video signal line 11 through the TFT 13.
  • the TFT 13 is not shown for simplification of the drawing. Accordingly, the pixel electrode 14 shown in FIG. 3 is depicted as if it were directly connected to the video signal line 11 and the scanning signal line 12.
  • the video drive unit 21 is connected to the upper ends of the video signal lines 11, 11,.
  • a plurality of later-described gradation signals are sequentially input to the video driving unit 21, and a later-described latch strobe signal (“LS” in FIG. 3) is input at an appropriate timing.
  • a video signal, a gradation signal, and a latch strobe signal, and a gate clock (“GC” in FIG. 3) and a scanning signal, which will be described later, are respectively rectangular wave signals.
  • the first correction unit 24 includes a temporary storage unit 241, a lookup table 242 (hereinafter referred to as LUT 242), and a calculation unit 243.
  • the gradation signal input to the first correction unit 24 is given to the temporary storage unit 241 and the calculation unit 243.
  • the first corrected gradation value is higher than the input gradation value of the target pixel
  • the input level of the target pixel is When the tone value is lower than the input tone value of the preceding pixel, the first corrected tone value is lower than the input tone value of the target pixel.
  • the input tone value of the target pixel is equal to the input tone value of the preceding pixel
  • the input tone value of the target pixel is equal to the first corrected tone value.
  • the gradation value indicated by the gradation signal given from the outside of the first correction unit 24 to the calculation unit 243 is the input gradation value of the target pixel.
  • the gradation value given from the temporary storage unit 241 to the calculation unit 243 is handled as the input gradation value of the preceding pixel.
  • the calculation unit 243 refers to the LUT 242 every time a gradation signal is input to the first correction unit 24, and combines the input gradation value of the target pixel and the input gradation value of the preceding pixel given to the calculation unit 243.
  • the first corrected gradation value associated with is obtained.
  • the calculation unit 243 outputs a gradation signal indicating the obtained first corrected gradation value to the second correction unit 25.
  • the correction by the first correction unit 24 suppresses the waveform rounding generated in the video signal flowing through the video signal line 11 that is caused by the difference between the input tone value of the target pixel and the input tone value of the preceding pixel. It is done in. Because the amplitude of the preceding video signal is larger / smaller than the amplitude of the target video signal, the amplitude of the video signal flowing through the video signal line 11 is larger / smaller than the amplitude corresponding to the input gradation value (that is, waveform rounding occurs).
  • the amplitude of the video signal actually applied to the pixel electrode 14 is appropriately reduced / increased (that is, the waveform). Curbing).
  • a plurality of gradation signals are sequentially input from the first correction unit 24 to the second correction unit 25.
  • the gradation value indicated by the gradation signal is the first corrected gradation value.
  • the second correction unit 25 further corrects the first corrected gradation value in accordance with the distance from the video driving unit 21 of the pixel electrode 14 (hereinafter referred to as the target pixel electrode 14) corresponding to the target pixel.
  • the further corrected gradation value after the first correction is hereinafter referred to as a second corrected gradation value.
  • the second correction unit 25 performs the second correction when the target pixel electrode 14 is far from the video driving unit 21 and the second corrected gradation value when the target pixel electrode 14 is close to the video driving unit 21.
  • the second corrected gradation value is calculated so as to be higher than the subsequent gradation value. This is because the rise time of the video signal input to the video signal line 11 becomes longer as it moves away from the video drive unit 21 due to adverse effects such as electrical resistance and capacitance of the video signal line 11 (that is, the waveform). This is because the rounding gets worse. In order to cancel this rounding of the waveform, when the target pixel electrode 14 is far from the video driving unit 21, it is necessary to make the second corrected gradation value higher than when the target pixel electrode 14 is close to the video driving unit 21. is there.
  • the second correction unit 25 of the present embodiment is the second corrected gradation value when the pixel of interest electrode 14 is far from the video driver 21 (that is, when the pixel electrode 14 of interest is long from the video driver 21). Is higher than the first corrected gradation value, and the second corrected gradation when the pixel electrode 14 of interest is close to the video driver 21 (that is, when the distance of the pixel electrode 14 from the video driver 21 is short). The value is set lower than the first corrected gradation value. When it cannot be said that the target pixel electrode 14 is far from or close to the video driving unit 21 (that is, when the distance of the target pixel electrode 14 from the video driving unit 21 is medium), the second correction unit 25 performs the second correction. The gradation value is made equal to the first corrected gradation value.
  • the second correction unit 25 includes a column counter 251, a row counter 252, a coefficient table 253, and a calculation unit 254.
  • the gradation signal input to the second correction unit 25 is given to the column counter 251 and the calculation unit 254.
  • individual row numbers are assigned to the scanning signal lines 12, 12,.
  • the row numbers assigned to the scanning signal lines 12, 12,... Are “1”, “2”,.
  • the scanning signal line 12 with the larger row number is farther from the video driver 21.
  • the count result of the column counter 251 before displaying the video is reset to “0”.
  • the column counter 251 increments the count result by “1” every time a gradation signal is given.
  • the column counter 251 gives a predetermined count signal to the row counter 252 and resets the count result to “0”.
  • the coefficient table 253 is a data table stored in a nonvolatile memory (not shown).
  • the coefficient table 253 stores row numbers and correction coefficients described later in association with each other.
  • the second corrected gradation value is obtained by multiplying the first corrected gradation value by a correction coefficient. The greater the line number, the greater the associated correction factor.
  • the gradation signal input to the control unit 23 is input to the video drive unit 21 as it is. Therefore, the gradation value indicated by the gradation signal input to the video driver 21 is the second corrected gradation value. Therefore, the video drive unit 21 inputs a video signal corresponding to the second corrected gradation value to the video signal lines 11, 11,. As a result, in the image displayed on the liquid crystal display panel 1, the output gradation value of each pixel is not significantly different from the input gradation value. That is, display quality can be improved.
  • the display device 2 according to the first embodiment includes K video drive units 21, 21,..., Whereas the display device 2 according to the present embodiment includes ⁇ 2 ⁇ K ⁇ video drive units 21, 21,. .
  • the display device 2 will be described as including two video driving units 21 and 21.
  • One of the two video drive units 21 is connected to the upper end of the video signal lines 11, 11,...
  • the other video drive unit 21 is connected to the lower end of the video signal lines 11, 11,. It is connected.
  • the gradation signal and the latch strobe signal are input from the control unit 23 to each of the video drive units 21 and 21.
  • the same video signal is simultaneously input to the video signal lines 11, 11,... From the upper end side and the lower end side.
  • the time table 233 is a data table stored in a nonvolatile memory (not shown).
  • the row number and the elapsed time t are stored in association with each other. The larger the line number, the smaller the associated elapsed time t.
  • the time table 233 stores first to third elapsed times t.
  • a video signal is given to the pixel electrode 14 corresponding to the scanning signal line 12 of the row number “N ⁇ 2/3 + 2” for ⁇ HT ⁇ time.
  • a waveform rounding due to the distance from the video drive unit 21 is significantly generated. That is, it takes a long time for the amplitude of the video signal to converge to the amplitude A from the amplitude corresponding to the gradation value “0”. Therefore, since a video signal having an amplitude A is given to the pixel electrode 14 only for a short time, a voltage corresponding to the gradation value “255” is applied to the liquid crystal between the pixel electrode 14 and the transparent electrode. Is applied only for a short time.
  • the pixel at the upper part of the liquid crystal display panel 1 and the pixel at the lower part of the liquid crystal display panel 1 reach the gradation value “255” from the gradation value “0”. That is, in the image displayed on the liquid crystal display panel 1, the output gradation value of each pixel is not much different from the input gradation value. That is, display quality can be improved.
  • the display device 2 as described above further suppresses the adverse effect of waveform rounding caused by the distance from the video driving unit 21 of each pixel electrode 14 by adjusting the timing of inputting the video signal to the video signal line.
  • Such a display device 2 can be easily obtained by replacing the control unit 23 included in the display device 2 of the first embodiment with the control unit 23 of the present embodiment. That is, it is not necessary to add new hardware in order to further improve the display quality, so that the manufacturing cost of the display device 2 can be suppressed.
  • the nonvolatile memory 261 stores first correction data, second correction data, and constant data (not shown).
  • the first correction data is a function and / or data table for calculating the first corrected gradation value based on the input gradation value of the target pixel and the input gradation value of the preceding pixel.
  • a decrease coefficient P 2 for obtaining the first corrected gradation value by decreasing the attention input gradation value when the attention input gradation value is lower than the previous stage input gradation value.
  • FIG. 12 is a flowchart illustrating a procedure of gradation value correction processing executed in the display device 2.
  • the computing unit 263 determines whether or not to start displaying video (S11), and when the video is not yet displayed (NO in S11), the processing of S11 is executed again.
  • the calculation unit 263 resets various variables (S12). Specifically, the calculation unit 263 resets the variable m for counting the columns to “0”, resets the row number n to “1”, the attention input gradation value g a , the previous stage input gradation value, g b, resets the first post-correction gradation value g 1, and the second corrected tone value g 2 respectively to "0".
  • the calculation unit 263 determines whether or not a gradation signal has been input to itself (S13). If it has not been input yet (NO in S13), the processing of S13 is executed again. If own tone signal is input (YES in S13), the arithmetic unit 263, the tone value indicated by the input gradation signal, assigns to the target input gradation value g a (S14), first Correction processing (see FIG. 13) is executed (S15). In the first correction process, the first corrected gradation value g 1 is obtained. After the end of the first correction process, the calculation unit 263 substitutes the value of the target input tone value g a for the previous input tone value g b (S16).
  • FIG. 13 is a flowchart showing details of the first correction processing procedure.
  • the computing unit 263 determines whether or not the target input tone value g a is greater than the previous-stage input tone value g b (S31). When g a > g b (YES in S31), the calculation unit 263 reads the increase coefficient P 1 from the nonvolatile memory 261 (S32), and the first corrected gradation value g according to the following equation (1): 1 is calculated (S33).
  • g 1 P 1 ⁇ g a (1)
  • the computing unit 263 in S33 or S36 also performs a process of rounding the first corrected gradation value g 1 obtained by the equations (1) and (2) to an integer of “0” to “255”.
  • the calculation unit 263 substitutes the target input tone value g a for the first corrected tone value g 1 (S37). After the process of S33, S36, or S37 is completed, the calculation unit 263 ends the first correction process and returns to the gradation value correction process shown in FIG.
  • the first correction data may be the LUT 242.
  • the calculation unit 263 in the first correction process refers to the LUT 242 instead of the processes of S31 to S37, and the first correction process associated with the combination of the target input tone value g a and the previous input tone value g b .
  • a process of obtaining a corrected gradation value g 1 is performed.
  • FIG. 14 is a flowchart showing details of the second correction processing procedure.
  • the computing unit 263 reads the function f from the nonvolatile memory 261 (S51). Next, the computing unit 263 calculates the second corrected gradation value g 2 by substituting the row number n and the first corrected gradation value g 1 into the function f (S52). At this time, the calculation unit 263 also performs a process of rounding the second corrected gradation value g 2 to an integer of “0” to “255”.
  • the calculation unit 263 increments the variable m by “1” (S53), and determines whether the variable m is equal to or greater than the constant M (S54).
  • the calculation unit 263 determines whether or not the row number n is equal to or greater than a constant N (S55).
  • n ⁇ N NO in S55
  • the calculation unit 263 increments the row number n by “1” (S56), and resets the variable m to “0” (S57). If n ⁇ N (YES in S55), the calculation unit 263 resets the row number n to “1” (S58), and moves the process to S57.
  • the second correction data may be a coefficient table 253.
  • the calculation unit 263 in the second correction process refers to the coefficient table 253 using the line number n instead of the process of S51, performs a process of obtaining a correction coefficient, and obtains the process instead of the process of S52.
  • a process of calculating the second corrected gradation value g 2 is performed by multiplying the correction coefficient by the first corrected gradation value g 1 and rounding the multiplication result to an integer of “0” to “255”.
  • the display device 2 as described above has the same operational effects as the display device 2 of the first embodiment.

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Abstract

In order to provide a display device in which display quality can be improved, the gradation value of a target pixel is corrected on the basis of an input gradation value of the target pixel and an input gradation value of a previous-stage pixel, and is further corrected in accordance with the distance, from an image drive unit 21, of a pixel electrode 14 corresponding to the target pixel. Thus, an image signal having an amplitude corresponding to the corrected gradation value (i.e., an appropriate amplitude) is provided to the pixel electrode 14. Accordingly, display quality can be improved by eliminating negative effects of waveform distortion caused by the difference between the input gradation value of the target pixel and the input gradation value of the previous-stage pixel, and also waveform distortion caused by the distance from the image drive unit 21.

Description

表示装置Display device
　本発明は、映像を表示する表示装置に関する。 The present invention relates to a display device that displays video.
　表示装置は表示パネル及び映像駆動部を備える。表示パネルには、縦横の格子状に配された各複数本の映像信号線及び走査信号線と、映像信号線及び走査信号線の各交差点に対応して１個ずつ配された画素電極とが含まれている（特許文献１参照）。 The display device includes a display panel and a video drive unit. The display panel includes a plurality of video signal lines and scanning signal lines arranged in a vertical and horizontal grid pattern, and pixel electrodes arranged one by one corresponding to the intersections of the video signal lines and the scanning signal lines. Included (see Patent Document 1).
　映像駆動部は映像信号線の端部に接続されている。走査信号線には、映像駆動部に近いものから順に、走査信号が入力される。映像駆動部は、何れかの走査信号線に走査信号が入力される場合に、全ての映像信号線に映像信号を入力する。
　映像信号は、走査信号が入力された走査信号線に対応して配されている画素電極に与えられる。
　表示パネルが表示する映像には、画素電極に与えられた映像信号に応じた階調値を有する画素が含まれている。 The video driver is connected to the end of the video signal line. Scan signals are input to the scan signal lines in order from the closest to the video drive unit. The video driver inputs video signals to all video signal lines when a scanning signal is input to any of the scanning signal lines.
The video signal is given to the pixel electrode arranged corresponding to the scanning signal line to which the scanning signal is input.
The video displayed on the display panel includes pixels having gradation values corresponding to the video signal applied to the pixel electrodes.
特開２００３－１７７３７５号公報JP 2003-177375 A
　しかしながら、表示装置が実際に表示した映像の画素が有する階調値は、表示装置が本来表示すべきだった映像の画素が有する階調値とは異なることがある。この結果、例えば市松模様の映像を表示すべきときに、無用の縞模様が付加された市松模様の映像を表示してしまうような、表示品位の劣化が生じる。 However, the gradation value of the image pixel actually displayed by the display device may be different from the gradation value of the image pixel that the display device should have originally displayed. As a result, for example, when a checkered image is to be displayed, display quality is deteriorated such that a checkered image with an unnecessary stripe pattern is displayed.
　以下では、本来表示すべき映像の画素が有する階調値を入力階調値といい、表示装置が表示する映像の画素が有する階調値を出力階調値という。
　また、注目画素（画像処理対象である画素）に対応する画素電極を注目画素電極といい、注目画素電極と同じ映像信号線から映像信号を与えられる画素電極の内、注目画素電極の映像駆動部に近い側に隣り合う画素電極を前段画素電極という。
　前段画素電極は、注目画素電極に縦方向（映像信号線の長さ方向）に隣り合う画素電極である。前段画素は、前段画素電極に対応する画素である。 In the following, the gradation value possessed by the pixel of the video to be originally displayed is referred to as the input gradation value, and the gradation value possessed by the pixel of the image displayed by the display device is referred to as the output gradation value.
In addition, a pixel electrode corresponding to a target pixel (a pixel to be image-processed) is referred to as a target pixel electrode. A pixel electrode adjacent to the side closer to the pixel is referred to as a previous pixel electrode.
The pre-stage pixel electrode is a pixel electrode adjacent to the target pixel electrode in the vertical direction (length direction of the video signal line). The front stage pixel is a pixel corresponding to the front stage pixel electrode.
　上述した表示品位の劣化の理由として、注目画素の入力階調値が、前段画素の入力階調値の悪影響を受けることが挙げられる。何故ならば、映像駆動部が、出力する映像信号を、前段画素の入力階調値に対応する映像信号（前段映像信号）から、注目画素の入力階調値に対応する映像信号（注目映像信号）に切り替えたとしても、映像信号の切り替え直後の映像信号線には、まだ前段映像信号が流れているからである。 The reason for the deterioration in display quality described above is that the input tone value of the target pixel is adversely affected by the input tone value of the previous pixel. This is because the video driver outputs the video signal output from the video signal corresponding to the input gradation value of the previous pixel (previous video signal) to the video signal corresponding to the input gradation value of the target pixel (target video signal). This is because the previous video signal is still flowing through the video signal line immediately after switching the video signal.
　従って、映像信号線に流れる映像信号は、前段映像信号から、前段映像信号と注目映像信号とが重ね合わされた映像信号に変化し、やがて注目映像信号に収束する。映像信号は矩形波信号であるが、前段映像信号との重ね合わせにより、波形なまりが生じることがある。
　前段画素の入力階調値と注目画素の入力階調値との差が大きいほど、注目映像信号と前段映像信号との振幅差は大きい。故に、注目映像信号に大きな波形なまりが生じる。大きな波形なまりが生じた注目映像信号が注目画素電極に与えられれば、注目画素の出力階調値が、注目画素の入力階調値とは大きく異なるものになる。 Therefore, the video signal flowing through the video signal line changes from the previous video signal to a video signal in which the previous video signal and the target video signal are superimposed, and eventually converges to the target video signal. Although the video signal is a rectangular wave signal, waveform rounding may occur due to superposition with the preceding video signal.
The larger the difference between the input tone value of the previous pixel and the input tone value of the target pixel, the greater the difference in amplitude between the target video signal and the previous video signal. Therefore, a large waveform rounding occurs in the target video signal. If a target video signal having a large waveform rounding is applied to the target pixel electrode, the output tone value of the target pixel is significantly different from the input tone value of the target pixel.
　ところで、注目画素の出力階調値と注目画素の入力階調値との差は、注目画素電極が映像駆動部から遠いほど甚だしくなる傾向にある。これは、映像駆動部から遠くなるほど、映像信号線の電気抵抗及び静電容量等の悪影響が映像信号に及んで、映像信号の立ち上がり時間が無用に長期化する（即ち波形なまりが悪化する）からである。 By the way, the difference between the output gradation value of the target pixel and the input gradation value of the target pixel tends to become more serious as the target pixel electrode is farther from the video driver. This is because, as the distance from the video drive unit increases, adverse effects such as electrical resistance and capacitance of the video signal line affect the video signal, and the rise time of the video signal is unnecessarily prolonged (that is, the waveform rounding is worsened). It is.
　特許文献１に記載の表示装置は、注目画素の入力階調値が、注目画素の横方向（走査信号線の長さ方向）に隣り合う画素の入力階調値の悪影響を受けることに起因する表示品位の劣化を抑制する。つまり、特許文献１の表示装置は、注目画素の入力階調値が前段画素の入力階調値の悪影響を受けることに起因する表示品位の劣化を抑制するものではない。
　また、特許文献１に記載の表示装置は、画素電極が３列周期の変形千鳥配置された特殊な構造を有している。従って、表示装置の製造コストが増大する虞がある。 In the display device described in Patent Document 1, the input tone value of the target pixel is adversely affected by the input tone value of a pixel adjacent in the horizontal direction of the target pixel (the length direction of the scanning signal line). Reduces display quality degradation. In other words, the display device of Patent Document 1 does not suppress display quality deterioration caused by the input gradation value of the target pixel being adversely affected by the input gradation value of the preceding pixel.
Further, the display device described in Patent Document 1 has a special structure in which pixel electrodes are arranged in a modified staggered manner with a period of three columns. Therefore, the manufacturing cost of the display device may increase.
　本発明は斯かる事情に鑑みてなされたものであり、その主たる目的は、表示品位を向上させることができる表示装置を提供することにある。 The present invention has been made in view of such circumstances, and a main object thereof is to provide a display device capable of improving display quality.
　本発明に係る表示装置は、複数の映像信号線と、該映像信号線に接続されている複数の画素電極と、前記複数の映像信号線の端部に接続されており、前記画素電極に与えられる映像信号を前記映像信号線に入力する映像入力部とを備え、前記画素電極に与えられた映像信号に応じた階調値を有する画素を含む映像を表示する表示装置において、注目画素の階調値と、前記注目画素に対応する画素電極と隣り合い、該画素電極と同じ映像信号線から映像信号を与えられる画素電極に対応する前段画素の階調値とに基づいて、前記注目画素の階調値を補正する第１補正部、及び、前記注目画素に対応する画素電極の前記映像入力部からの遠近に応じて、前記第１補正部による補正後の階調値を更に補正する第２補正部を備え、前記映像入力部は、前記第２補正部による補正後の階調値に応じた映像信号を前記映像信号線に入力するようにしてあることを特徴とする。 The display device according to the present invention includes a plurality of video signal lines, a plurality of pixel electrodes connected to the video signal lines, and an end of the plurality of video signal lines. In a display device for displaying an image including a pixel having a gradation value corresponding to the video signal applied to the pixel electrode, the image input unit includes: Based on the tone value and the gradation value of the previous pixel adjacent to the pixel electrode corresponding to the target pixel and corresponding to the pixel electrode to which a video signal is applied from the same video signal line as the pixel electrode, A first correction unit that corrects a gradation value, and a first correction unit that further corrects the gradation value corrected by the first correction unit according to the perspective of the pixel electrode corresponding to the target pixel from the video input unit. 2 correction units, and the video input unit Characterized in that a video signal corresponding to the gray scale value corrected by the second correcting unit are to be input to the video signal lines.
　本発明に係る表示装置は、前記第１補正部は、前記注目画素の階調値が前記前段画素の階調値よりも高い場合、補正後の階調値を前記注目画素の階調値よりも高く、前記注目画素の階調値が前記前段画素の階調値よりも低い場合、補正後の階調値を前記注目画素の階調値よりも低く補正するようにしてあることを特徴とする。 In the display device according to the aspect of the invention, the first correction unit may correct the corrected gradation value from the gradation value of the target pixel when the gradation value of the target pixel is higher than the gradation value of the preceding pixel. If the gradation value of the target pixel is lower than the gradation value of the preceding pixel, the corrected gradation value is corrected to be lower than the gradation value of the target pixel. To do.
　本発明に係る表示装置は、前記第２補正部は、前記第１補正部による補正後の階調値を、前記注目画素に対応する画素電極が前記映像入力部から近いほど低く、前記注目画素に対応する画素電極が前記映像入力部に遠いほど高く補正するようにしてあることを特徴とする。 In the display device according to the aspect of the invention, the second correction unit may reduce the gradation value corrected by the first correction unit as the pixel electrode corresponding to the target pixel is closer to the video input unit, and the target pixel. The pixel electrode corresponding to is corrected higher as it is farther from the video input unit.
　本発明に係る表示装置は、前記第２補正部は、前記注目画素に対応する画素電極が前記映像入力部に近い場合、補正後の階調値を前記第１補正部による補正後の階調値よりも低く、前記注目画素に対応する画素電極が前記映像入力部から遠い場合、補正後の階調値を前記第１補正部による補正後の階調値よりも高く補正するようにしてあることを特徴とする。 In the display device according to the present invention, when the pixel electrode corresponding to the target pixel is close to the video input unit, the second correction unit uses the corrected gradation value after the correction by the first correction unit. If the pixel electrode corresponding to the target pixel is lower than the value and far from the video input unit, the corrected gradation value is corrected to be higher than the corrected gradation value by the first correction unit. It is characterized by that.
　本発明に係る表示装置は、前記複数の映像信号線に交差するよう並置されており、順に走査信号が入力される複数の走査信号線を更に備え、前記映像入力部は、前記走査信号線に走査信号が入力される場合に、前記画素電極に与えられる映像信号を前記映像信号線に入力するようにしてあり、前記走査信号線に走査信号が入力される時点を基準にした前記映像信号線に映像信号が入力されるタイミングは、前記走査信号が入力される前記走査信号線の前記映像入力部からの遠近に応じて異なることを特徴とする。 The display device according to the present invention further includes a plurality of scanning signal lines that are juxtaposed so as to intersect the plurality of video signal lines, and sequentially input a scanning signal, and the video input unit is connected to the scanning signal lines. When a scanning signal is input, the video signal applied to the pixel electrode is input to the video signal line, and the video signal line is based on the time when the scanning signal is input to the scanning signal line. The timing at which the video signal is input differs according to the distance from the video input unit of the scanning signal line to which the scanning signal is input.
　本発明にあっては、注目画素の階調値に、第１補正部及び第２補正部による２段階の補正が施される。
　まず、注目画素の入力階調値及び前段画素の入力階調値夫々に基づいて、第１補正部が注目画素の階調値を補正する。第１補正部による補正後の階調値に応じた映像信号は、注目画素の入力階調値と前段画素の入力階調値との差に起因する波形なまりが抑制されている。
　次に、画素電極の映像入力部からの遠近に応じて、第２補正部が注目画素の補正後の階調値を更に補正する。第２補正部による補正後の階調値に応じた映像信号は、画素電極の映像入力部からの遠近に起因する波形なまりが抑制されている。
　この結果、入力階調値に対応した出力階調値を有する画素が表示される。 In the present invention, the gradation value of the target pixel is subjected to two-stage correction by the first correction unit and the second correction unit.
First, the first correction unit corrects the gradation value of the pixel of interest based on the input gradation value of the pixel of interest and the input gradation value of the preceding pixel. In the video signal corresponding to the gradation value corrected by the first correction unit, waveform rounding caused by the difference between the input gradation value of the target pixel and the input gradation value of the preceding pixel is suppressed.
Next, according to the perspective of the pixel electrode from the video input unit, the second correction unit further corrects the corrected gradation value of the target pixel. In the video signal corresponding to the gradation value corrected by the second correction unit, waveform rounding due to the perspective of the pixel electrode from the video input unit is suppressed.
As a result, a pixel having an output gradation value corresponding to the input gradation value is displayed.
　本発明にあっては、注目画素の入力階調値が前段画素の入力階調値よりも高い場合、第１補正部による補正後の階調値は、注目画素の入力階調値よりも高い。従って、前段画素に与えられた映像信号の影響で注目画素に与えられる映像信号の振幅が小さくなりがちな場合に、映像信号の振幅を適宜に増大させることができる。 In the present invention, when the input tone value of the target pixel is higher than the input tone value of the previous pixel, the tone value after correction by the first correction unit is higher than the input tone value of the target pixel. . Therefore, when the amplitude of the video signal given to the target pixel tends to be reduced due to the influence of the video signal given to the preceding pixel, the amplitude of the video signal can be increased appropriately.
　一方、注目画素の入力階調値が前段画素の入力階調値よりも低い場合、第１補正部による補正後の階調値は、注目画素の入力階調値よりも低い。従って、前段画素に与えられた映像信号の影響で注目画素に与えられる映像信号の振幅が大きくなりがちな場合に、映像信号の振幅を適宜に減少させることができる。 On the other hand, when the input tone value of the target pixel is lower than the input tone value of the previous pixel, the tone value after correction by the first correction unit is lower than the input tone value of the target pixel. Accordingly, when the amplitude of the video signal given to the target pixel tends to increase due to the influence of the video signal given to the previous stage pixel, the amplitude of the video signal can be appropriately reduced.
　本発明にあっては、注目画素に対応する画素電極が映像入力部から遠い場合の第２補正部による補正後の階調値は、注目画素に対応する画素電極が映像入力部に近い場合の第２補正部による補正後の階調値よりも高い。
　従って、画素電極が映像入力部から遠いほど長期化しがちな映像信号の立ち上がり時間を、適宜に短縮することができる。 In the present invention, when the pixel electrode corresponding to the target pixel is far from the video input unit, the gradation value after correction by the second correction unit is the same as when the pixel electrode corresponding to the target pixel is close to the video input unit. It is higher than the gradation value after correction by the second correction unit.
Accordingly, the rise time of the video signal, which tends to be longer as the pixel electrode is farther from the video input unit, can be appropriately shortened.
　本発明にあっては、注目画素に対応する画素電極が、映像制御部に近い場合、第２補正部による補正後の階調値は、第１補正部による補正後の階調値よりも低い。一方、注目画素に対応する画素電極が、映像制御部から遠い場合、第２補正部による補正後の階調値は、第１補正部による補正後の階調値よりも高い。 In the present invention, when the pixel electrode corresponding to the target pixel is close to the video control unit, the gradation value after correction by the second correction unit is lower than the gradation value after correction by the first correction unit. . On the other hand, when the pixel electrode corresponding to the target pixel is far from the video control unit, the gradation value corrected by the second correction unit is higher than the gradation value corrected by the first correction unit.
　階調値には上限値及び下限値がある。第１補正部による補正後の階調値が上限値（又は下限値）である場合には、第２補正部による補正後の階調値を上限値（又は下限値）とすればよい。また、階調値の中央値を境に補正の増減が入れ替わるので、上限値付近の階調値に対する補正量及び下限付近の階調値に対する補正量夫々の絶対値を同程度にすることができる。
　以上の結果、上限値から下限値まで何れの値の階調値に対しても適切な補正を施すことができるので、表示品位を向上させることができる。 The gradation value has an upper limit value and a lower limit value. When the gradation value corrected by the first correction unit is the upper limit value (or lower limit value), the gradation value corrected by the second correction unit may be set as the upper limit value (or lower limit value). Further, since the increase / decrease of correction is switched at the boundary of the median value of the gradation values, the absolute values of the correction amount for the gradation value near the upper limit value and the correction amount for the gradation value near the lower limit value can be made similar. .
As a result, appropriate correction can be applied to any gradation value from the upper limit value to the lower limit value, so that the display quality can be improved.
　本発明にあっては、各画素電極に対応する走査信号線に走査信号が入力される時点を基準にした場合、映像入力部に近い画素電極に映像信号が与えられるタイミングと、映像入力部から遠い画素電極に映像信号が与えられるタイミングとが異なる。 In the present invention, when the scanning signal is input to the scanning signal line corresponding to each pixel electrode, the timing at which the video signal is applied to the pixel electrode near the video input unit, and the video input unit The timing at which a video signal is applied to a distant pixel electrode is different.
　映像信号の振幅は、第２補正部による補正後の階調値に対応しなければならないが、映像信号に波形なまりが生じている場合、映像信号の振幅は、補正後の階調値に対応する振幅Ａよりも小さい（又は大きい）振幅になる。しかしながら、映像信号の振幅は、時間の経過に伴って振幅Ａに収束する。そこで、波形なまりが大きい映像信号には早めに画素電極に与え、波形なまりが小さい映像信号には遅めに画素電極に与えれば、各画素電極に振幅Ａの映像信号が必要十分な時間だけ与えられる。 The amplitude of the video signal must correspond to the gradation value after correction by the second correction unit, but if the waveform is rounded in the video signal, the amplitude of the video signal corresponds to the gradation value after correction. The amplitude is smaller (or larger) than the amplitude A. However, the amplitude of the video signal converges to the amplitude A over time. Therefore, if a video signal with a large waveform rounding is applied to the pixel electrode early and a video signal with a small waveform rounding is applied to the pixel electrode later, a video signal having an amplitude A is applied to each pixel electrode for a necessary and sufficient time. It is done.
　つまり、画素電極に映像信号を与えるタイミングを、画素電極の映像入力部からの遠近に応じて変更する。故に、波形なまりが収束した映像信号が、必要十分な時間だけ各画素電極に与えられるので、補正後の階調値に対応した階調値を有する画素が表示される。従って、注目画素の入力階調値と前段画素の入力階調値との差に起因する波形なまり、及び映像入力部からの遠近に起因する波形なまり夫々の悪影響を更に排除して、表示品位を更に向上させることができる。 That is, the timing for applying the video signal to the pixel electrode is changed according to the distance from the video input unit of the pixel electrode. Therefore, since the video signal in which the waveform rounding is converged is applied to each pixel electrode for a necessary and sufficient time, a pixel having a gradation value corresponding to the corrected gradation value is displayed. Accordingly, the waveform rounding caused by the difference between the input tone value of the target pixel and the input tone value of the preceding pixel and the waveform rounding caused by the distance from the video input unit are further eliminated, and the display quality is improved. Further improvement can be achieved.
　本発明の表示装置による場合、注目画素の階調値（即ち、画素電極に与えられる映像信号の振幅に対応するもの）は、注目画素の入力階調値及び前段画素の入力階調値夫々に基づいて補正され、画素電極の映像入力部からの遠近に応じて更に補正される。故に、適切な振幅を有する映像信号が、画素電極に与えられる。
　従って、注目画素の入力階調値と前段画素の入力階調値との差に起因する波形なまりのみならず、映像入力部からの遠近に起因する波形なまりの悪影響を排除して、表示品位を向上させることができる。 According to the display device of the present invention, the gradation value of the target pixel (that is, the one corresponding to the amplitude of the video signal applied to the pixel electrode) is set for each of the input gradation value of the target pixel and the input gradation value of the preceding pixel. Based on this, the pixel electrode is further corrected according to the distance from the video input unit. Therefore, a video signal having an appropriate amplitude is applied to the pixel electrode.
Therefore, not only the waveform rounding caused by the difference between the input tone value of the target pixel and the input tone value of the preceding pixel, but also the adverse effect of the waveform rounding caused by the distance from the video input unit is eliminated, and the display quality is improved. Can be improved.
本発明の実施の形態１に係る表示装置の構成を示すブロック図である。It is a block diagram which shows the structure of the display apparatus which concerns on Embodiment 1 of this invention. 表示装置が備える画素電極と映像信号線及び走査信号線夫々との接続関係を示すブロック図である。It is a block diagram which shows the connection relation of the pixel electrode with which a display apparatus is provided, and each of a video signal line and a scanning signal line. 表示装置の制御系の構成を示すブロック図である。It is a block diagram which shows the structure of the control system of a display apparatus. 表示装置が備える第１補正部及び第２補正部夫々の構成を示すブロック図である。It is a block diagram which shows the structure of each of the 1st correction | amendment part with which a display apparatus is provided, and a 2nd correction | amendment part. 本発明の実施の形態２に係る表示装置の制御系の構成を示すブロック図である。It is a block diagram which shows the structure of the control system of the display apparatus which concerns on Embodiment 2 of this invention. 本発明の実施の形態３に係る表示装置が備える制御部の構成を示すブロック図である。It is a block diagram which shows the structure of the control part with which the display apparatus which concerns on Embodiment 3 of this invention is provided. 表示装置におけるゲートクロック、走査信号、ラッチストローブ信号、及び映像信号夫々の出力のタイミング（映像駆動部に近い場合）を示すタイミングチャートである。5 is a timing chart showing the output timings (when close to the video driver) of the gate clock, scanning signal, latch strobe signal, and video signal in the display device. 表示装置におけるゲートクロック、走査信号、ラッチストローブ信号、及び映像信号夫々の出力のタイミング（映像駆動部から遠い場合）を示すタイミングチャートである。5 is a timing chart showing the output timings (when distant from the video driver) of the gate clock, scanning signal, latch strobe signal, and video signal in the display device. 従来の表示装置におけるゲートクロック、走査信号、ラッチストローブ信号、及び映像信号夫々の出力のタイミング（映像駆動部に近い場合）を示すタイミングチャートである。It is a timing chart which shows the output timing (when it is close to a video drive part) of each of a gate clock, a scanning signal, a latch strobe signal, and a video signal in a conventional display device. 従来の表示装置におけるゲートクロック、走査信号、ラッチストローブ信号、及び映像信号夫々の出力のタイミング（映像駆動部から遠い場合）を示すタイミングチャートである。It is a timing chart which shows the output timing (when it is far from a video drive part) of each of a gate clock in a conventional display apparatus, a scanning signal, a latch strobe signal, and a video signal. 本発明の実施の形態４に係る表示装置が備える制御部の構成を示すブロック図である。It is a block diagram which shows the structure of the control part with which the display apparatus which concerns on Embodiment 4 of this invention is provided. 表示装置で実行される階調値補正処理の手順を示すフローチャートである。It is a flowchart which shows the procedure of the gradation value correction process performed with a display apparatus. 表示装置で実行される第１補正処理手順の詳細を示すフローチャートである。It is a flowchart which shows the detail of the 1st correction process procedure performed with a display apparatus. 表示装置で実行される第２補正処理手順の詳細を示すフローチャートである。It is a flowchart which shows the detail of the 2nd correction | amendment process procedure performed with a display apparatus.
　以下、本発明を、その実施の形態を示す図面に基づいて詳述する。 Hereinafter, the present invention will be described in detail based on the drawings showing the embodiments thereof.
実施の形態　１．
　図１は、本発明の実施の形態１に係る表示装置２の構成を示すブロック図である。
　図２は、表示装置２が備える画素電極１４，１４，…と映像信号線１１，１１，…及び走査信号線１２，１２，…夫々との接続関係を示すブロック図である。
　図３は、表示装置２の制御系の構成を示すブロック図である。
　本実施の形態の表示装置２は、テレビジョン受信機、又はパーソナルコンピュータのディスプレイ等として構成されている。表示装置２は、例えばＲＧＢ（Red,Green,Blue）３原色を用いてフルカラーの映像を表示する。
　なお、表示装置２はＲＧＢ３原色に限定されず、ＲＧＢＹ（Red,Green,Blue,Yellow ）４原色、又はＲＧＢＷ（Red,Green,Blue,White）４原色等でもよい。 Embodiment 1.
FIG. 1 is a block diagram showing a configuration of a display device 2 according to Embodiment 1 of the present invention.
2 is a block diagram showing a connection relationship between the pixel electrodes 14, 14,... Included in the display device 2 and the video signal lines 11, 11,... And the scanning signal lines 12, 12,.
FIG. 3 is a block diagram illustrating a configuration of a control system of the display device 2.
The display device 2 of the present embodiment is configured as a television receiver or a display of a personal computer. The display device 2 displays a full-color image using, for example, RGB (Red, Green, Blue) three primary colors.
The display device 2 is not limited to the three primary colors RGB, but may be the four primary colors RGBY (Red, Green, Blue, Yellow) or the four primary colors RGBW (Red, Green, Blue, White).
　表示装置２は、液晶表示パネル１、Ｋ個の映像駆動部２１，２１，…（映像入力部）、Ｌ個の走査駆動部２２，２２，…、制御部２３、第１補正部２４、及び第２補正部２５を備える。ここで、Ｋ，Ｌ夫々は複数である。以下では説明を簡単にするために、表示装置２が各１個の映像駆動部２１及び走査駆動部２２を備えているものとして説明する。また、以下の説明では、液晶表示パネル１の上下左右方向を図に向かって上下左右方向とする。 The display device 2 includes a liquid crystal display panel 1, K video drive units 21, 21,... (Video input unit), L scan drive units 22, 22..., A control unit 23, a first correction unit 24, and A second correction unit 25 is provided. Here, there are a plurality of K and L. Hereinafter, in order to simplify the description, it is assumed that the display device 2 includes one video driving unit 21 and one scanning driving unit 22. In the following description, the vertical and horizontal directions of the liquid crystal display panel 1 are the vertical and horizontal directions as viewed in the figure.
　液晶表示パネル１は、前後方向に対面配置された２枚の透光基板と、透光基板間に封止された液晶とを有する（各図示）。透光基板の一方には、Ｍ本の映像信号線１１，１１，…、Ｎ本の走査信号線１２，１２，…、｛Ｍ×Ｎ｝個のＴＦＴ１３，１３，…（Thin Film Transistor）、及び｛Ｍ×Ｎ｝個の画素電極１４，１４，…が設けられている。ここで、Ｍ，Ｎ夫々は複数である。透光基板の他方には図示しない透明電極層が設けられている。
　図２では、映像信号線１１，１１，…同士及び走査信号線１２，１２，…同士を区別するために、一部の符号１１，１１，…及び符号１２，１２，…に添え字L1，L2，…を付してある。また、図２では、ＴＦＴ１３，１３，…同士及び画素電極１４，１４，…同士を区別するために、一部の符号１３，１３，…及び符号１４，１４，…に添え字11，12，…を付してある。図２では、ＴＦＴ１３を「Ｔ」の文字で表している。 The liquid crystal display panel 1 includes two light-transmitting substrates disposed facing each other in the front-rear direction, and liquid crystal sealed between the light-transmitting substrates (each illustrated). On one side of the transparent substrate, M video signal lines 11, 11,..., N scanning signal lines 12, 12,..., {M × N} TFTs 13, 13,. And {M × N} pixel electrodes 14, 14,... Are provided. Here, there are a plurality of M and N. A transparent electrode layer (not shown) is provided on the other side of the translucent substrate.
In FIG. 2, in order to distinguish the video signal lines 11, 11,... And the scanning signal lines 12, 12,. L2, ... are attached. In FIG. 2, in order to distinguish the TFTs 13, 13,... And the pixel electrodes 14, 14,. ... is attached. In FIG. 2, the TFT 13 is represented by a letter “T”.
　液晶表示パネル１には映像が表示される。液晶表示パネル１に表示される映像には、画素電極１４，１４，…に対応する画素が含まれている。各画素は、Ｒ色、Ｇ色、又はＢ色の出力階調値を有する。各画素の出力階調値は、当該画素に対応する画素電極１４に与えられた映像信号の振幅に対応する。図２及び図３では、Ｒ色（又はＧ色若しくはＢ色）の画素に対応する画素電極１４を「Ｒ」（又は「Ｇ」若しくは「Ｂ」）の文字で表している。
　液晶表示パネル１に表示される映像において、映像に含まれている各画素の出力階調値は、本来表示すべき映像に含まれている各画素の入力階調値に等しいことが望ましい。各階調値は“０”以上“２５５”以下の整数である。 An image is displayed on the liquid crystal display panel 1. The image displayed on the liquid crystal display panel 1 includes pixels corresponding to the pixel electrodes 14, 14. Each pixel has an output gradation value of R color, G color, or B color. The output gradation value of each pixel corresponds to the amplitude of the video signal applied to the pixel electrode 14 corresponding to the pixel. 2 and 3, the pixel electrode 14 corresponding to the R (or G or B) pixel is represented by the letter “R” (or “G” or “B”).
In the image displayed on the liquid crystal display panel 1, it is desirable that the output gradation value of each pixel included in the image is equal to the input gradation value of each pixel included in the image to be originally displayed. Each gradation value is an integer from “0” to “255”.
　映像信号線１１，１１，…は左右方向（液晶表示パネル１の幅方向）に適長離隔して並置されている。各映像信号線１１は上下方向（液晶表示パネル１の高さ方向）に長い。映像信号線１１L1，１１L2，…は左からこの順に並んでいる。
　走査信号線１２，１２，…は上下方向に適長離隔して並置されている。各走査信号線１２は左右方向に長く、Ｍ本の映像信号線１１，１１，…に交差している。即ち、映像信号線１１，１１，…及び走査信号線１２，１２，…は格子状に配されている。走査信号線１２L1，１２L2，…は上からこの順に並んでいる。 The video signal lines 11, 11,... Are juxtaposed at an appropriate distance in the left-right direction (the width direction of the liquid crystal display panel 1). Each video signal line 11 is long in the vertical direction (the height direction of the liquid crystal display panel 1). The video signal lines 11 L1 , 11 L2 ,... Are arranged in this order from the left.
The scanning signal lines 12, 12,... Are juxtaposed at an appropriate distance in the vertical direction. Each scanning signal line 12 is long in the left-right direction, and crosses the M video signal lines 11, 11,. In other words, the video signal lines 11, 11,... And the scanning signal lines 12, 12,. The scanning signal lines 12 L1 , 12 L2 ,... Are arranged in this order from the top.
　ＴＦＴ１３，１３，…は、映像信号線１１，１１，…及び走査信号線１２，１２，…の各交差点に対応して１個ずつ交差点近傍に配されている。各ＴＦＴ１３はスイッチング素子であり、交差点の映像信号線１１及び走査信号線１２に接続されている。具体的には、ＴＦＴ１３のソース電極（及びゲート電極）が映像信号線１１（及び走査信号線１２）に接続されている。
　図２に示すように、ＴＦＴ１３11，１３12，…（及びＴＦＴ１３21，１３22，…）は、この順に上から並んで、映像信号線１１L1（及び映像信号線１１L2）に接続されている。ＴＦＴ１３11，１３12，…は、走査信号線１２L1，１２L2，…に個別に接続されている。同様に、ＴＦＴ１３21，１３22，…も、走査信号線１２L1，１２L2，…に個別に接続されている。 The TFTs 13, 13,... Are arranged in the vicinity of the intersections one by one corresponding to the intersections of the video signal lines 11, 11,. Each TFT 13 is a switching element and is connected to the video signal line 11 and the scanning signal line 12 at the intersection. Specifically, the source electrode (and gate electrode) of the TFT 13 is connected to the video signal line 11 (and scanning signal line 12).
As shown in FIG. 2, TFTs 13 11 , 13 12 ,... (And TFTs 13 21 , 13 22 ,...) Are arranged in this order from above and connected to the video signal line 11 L1 (and video signal line 11 L2 ). Yes. The TFTs 13 11 , 13 12 ,... Are individually connected to the scanning signal lines 12 L1 , 12 L2,. Similarly, the TFTs 13 21 , 13 22 ,... Are individually connected to the scanning signal lines 12 L1 , 12 L2,.
　左右方向に隣り合う２本の映像信号線１１L1，１１L2間にて、映像信号線１１L1に接続されているＴＦＴ１３11，１３12，…と映像信号線１１L2に接続されているＴＦＴ１３21，１３22，…とは、上下方向に交互に並置されている。
　上下方向に隣り合う２本の走査信号線１２，１２間にて、一方の走査信号線１２に接続されているＴＦＴ１３，１３，…と他方の走査信号線１２に接続されているＴＦＴ１３，１３，…とは、左右方向に交互に並置されている。 At lateral direction adjacent two video signal lines 11 L1, 11 L2 between the video signal line 11 L1 in connected TFT 13 11, 13 12, ... and are connected to the video signal line 11 L2 TFT 13 21 , 13 22 ,... Are alternately arranged in the vertical direction.
Between the two scanning signal lines 12 and 12 adjacent in the vertical direction, the TFTs 13, 13,... Connected to one scanning signal line 12 and the TFTs 13, 13, connected to the other scanning signal line 12. Are alternately arranged in the left-right direction.
　画素電極１４，１４，…はマトリクス状に配されており、ＴＦＴ１３，１３，…のドレイン電極に一対一対応で接続されている。即ち、画素電極１４はＴＦＴ１３を介して映像信号線１１に接続されている。
　図３では図面の簡単化のためにＴＦＴ１３の図示を省略している。従って、図３に示す画素電極１４は映像信号線１１及び走査信号線１２に直接的に接続されているかのように描き表わされている。 The pixel electrodes 14, 14,... Are arranged in a matrix and are connected to the drain electrodes of the TFTs 13, 13,. That is, the pixel electrode 14 is connected to the video signal line 11 through the TFT 13.
In FIG. 3, the TFT 13 is not shown for simplification of the drawing. Accordingly, the pixel electrode 14 shown in FIG. 3 is depicted as if it were directly connected to the video signal line 11 and the scanning signal line 12.
　映像駆動部２１は、映像信号線１１，１１，…の上端部に接続されている。映像駆動部２１には、複数個の後述する階調信号が順次入力され、後述するラッチストローブ信号（図３中「ＬＳ」）が適宜のタイミングで入力される。映像信号、階調信号、及びラッチストローブ信号と、各後述するゲートクロック（図３中「ＧＣ」）及び走査信号とは、夫々矩形波信号である。 The video drive unit 21 is connected to the upper ends of the video signal lines 11, 11,. A plurality of later-described gradation signals are sequentially input to the video driving unit 21, and a later-described latch strobe signal (“LS” in FIG. 3) is input at an appropriate timing. A video signal, a gradation signal, and a latch strobe signal, and a gate clock (“GC” in FIG. 3) and a scanning signal, which will be described later, are respectively rectangular wave signals.
　ラッチストローブ信号は、映像駆動部２１が映像信号を出力するタイミングを示す。ラッチストローブ信号が入力される都度、映像駆動部２１は、Ｍ個の映像信号をＭ本の映像信号線１１，１１，…へ一対一対応で出力する。このとき出力されるＭ個の映像信号は、映像駆動部２１に入力された階調信号の内の、直近Ｍ個の階調信号に対応するものである。 The latch strobe signal indicates the timing at which the video drive unit 21 outputs the video signal. Each time the latch strobe signal is input, the video drive unit 21 outputs M video signals to the M video signal lines 11, 11,. The M video signals output at this time correspond to the most recent M gray level signals among the gray level signals input to the video drive unit 21.
　階調信号は階調値を示す。階調信号に対応する映像信号は、階調信号が示す階調値に対応する振幅を有する。各映像信号線１１への映像信号の出力は、ラッチストローブ信号が入力されてから少なくとも次のラッチストローブ信号が入力されるまで継続される。つまり、映像駆動部２１は、ラッチストローブ信号が入力される都度、出力する映像信号の振幅を変更するか、又は同じ振幅のまま維持する。 The gradation signal indicates the gradation value. The video signal corresponding to the gradation signal has an amplitude corresponding to the gradation value indicated by the gradation signal. The output of the video signal to each video signal line 11 is continued until at least the next latch strobe signal is input after the latch strobe signal is input. That is, every time the latch strobe signal is input, the video driver 21 changes the amplitude of the video signal to be output or maintains the same amplitude.
　各画素電極１４の映像駆動部２１からの遠近は、画素電極１４に対応する走査信号線１２（即ちＴＦＴ１３を介して画素電極１４に接続されている走査信号線１２）の映像駆動部２１からの遠近に対応する。画素電極１４に対応する走査信号線１２が上側に位置している（即ち、走査信号線１２が映像駆動部２１に近い）ほど、画素電極１４は映像駆動部２１に近い。 The perspective of each pixel electrode 14 from the video drive unit 21 is from the video drive unit 21 of the scanning signal line 12 corresponding to the pixel electrode 14 (that is, the scanning signal line 12 connected to the pixel electrode 14 via the TFT 13). Corresponding to the perspective. The closer the scanning signal line 12 corresponding to the pixel electrode 14 is to the upper side (that is, the closer the scanning signal line 12 is to the video driving unit 21), the closer the pixel electrode 14 is to the video driving unit 21.
　走査駆動部２２は、走査信号線１２，１２，…の左端部に接続されている。走査駆動部２２には、ゲートクロックが一定のタイミングで断続的に入力される。ゲートクロックは、走査駆動部２２が走査信号を出力するタイミングを示す。走査駆動部２２は、ゲートクロックが入力されてから所定時間Ｈの間、何れか１本の走査信号線１２へ走査信号を出力し続け、所定時間Ｈが経過したときに、走査信号線１２への走査信号の出力を停止する。
　走査信号線１２に入力された走査信号は、走査信号が入力された走査信号線１２に接続されているＴＦＴ１３，１３，…に与えられる。ＴＦＴ１３は通常はオフであり、走査信号が与えられている間（即ち所定時間Ｈの間）だけオンになる。 The scanning drive unit 22 is connected to the left end of the scanning signal lines 12, 12,. A gate clock is intermittently input to the scan driver 22 at a fixed timing. The gate clock indicates the timing at which the scan driver 22 outputs a scan signal. The scanning drive unit 22 continues to output the scanning signal to any one scanning signal line 12 for a predetermined time H after the gate clock is input, and when the predetermined time H has passed, the scanning driving unit 22 supplies the scanning signal to the scanning signal line 12. The output of the scanning signal is stopped.
The scanning signal input to the scanning signal line 12 is applied to the TFTs 13, 13,... Connected to the scanning signal line 12 to which the scanning signal is input. The TFT 13 is normally turned off, and is turned on only while the scanning signal is applied (that is, for a predetermined time H).
　ＴＦＴ１３，１３，…がオンになると、オンになったＴＦＴ１３，１３，…に接続されている画素電極１４，１４，…に、映像信号が与えられる。オフのままのＴＦＴ１３，１３，…に接続されている画素電極１４，１４，…には、映像信号は与えられない。
　画素電極１４に映像信号が与えられると、与えられた映像信号の振幅に応じた電圧が、映像信号を受けた画素電極１４と上述の透明電極層との間に印加される。このとき、映像信号を受けた画素電極１４と透明電極層との間に存在する液晶の配向が変化する。この結果、映像信号を受けた画素電極１４に対応する画素の階調値が、映像信号の振幅に対応する階調値になる。 When the TFTs 13, 13,... Are turned on, a video signal is given to the pixel electrodes 14, 14,... Connected to the TFTs 13, 13,. .. Are not supplied to the pixel electrodes 14, 14,... Connected to the TFTs 13, 13,.
When a video signal is applied to the pixel electrode 14, a voltage corresponding to the amplitude of the applied video signal is applied between the pixel electrode 14 that has received the video signal and the above-described transparent electrode layer. At this time, the orientation of the liquid crystal existing between the pixel electrode 14 receiving the video signal and the transparent electrode layer changes. As a result, the gradation value of the pixel corresponding to the pixel electrode 14 that has received the video signal becomes a gradation value corresponding to the amplitude of the video signal.
　走査駆動部２２は、ゲートクロックが入力される都度、上側（映像駆動部２１に近い側）の走査信号線１２から順に、走査信号を出力する。具体的には、走査駆動部２２は、ゲートクロックの入力に伴って走査信号線１２L1へ走査信号を出力した場合、次のゲートクロックの入力に伴って走査信号線１２L2へ走査信号を出力する。 Each time the gate clock is input, the scan driver 22 sequentially outputs the scan signals from the scan signal line 12 on the upper side (side closer to the video driver 21). Specifically, when the scanning drive unit 22 outputs a scanning signal to the scanning signal line 12 L1 with the input of the gate clock, the scanning driving unit 22 outputs the scanning signal to the scanning signal line 12 L2 with the input of the next gate clock. To do.
　従って、画素電極１４12（又は画素電極１４22）に対応する画素を注目画素とした場合、前段画素に対応する前段画素電極は、画素電極１４11（又は画素電極１４21）である。画素電極１４13（又は画素電極１４23）に対応する画素を注目画素とした場合、前段画素に対応する前段画素電極は、画素電極１４12（又は画素電極１４22）である。
　最下位置の走査信号線１２へ走査信号を出力した後でゲートクロックが入力された場合、走査駆動部２２は、最上位置の走査信号線１２へ走査信号を出力する。 Therefore, when the pixel corresponding to the pixel electrode 14 12 (or pixel electrode 14 22 ) is the target pixel, the previous pixel electrode corresponding to the previous pixel is the pixel electrode 14 11 (or pixel electrode 14 21 ). When the pixel corresponding to the pixel electrode 14 13 (or pixel electrode 14 23 ) is the target pixel, the previous pixel electrode corresponding to the previous pixel is the pixel electrode 14 12 (or pixel electrode 14 22 ).
When a gate clock is input after outputting a scanning signal to the scanning signal line 12 at the lowest position, the scanning driver 22 outputs the scanning signal to the scanning signal line 12 at the uppermost position.
　制御部２３には、複数個の階調信号が順次入力される。制御部２３は、入力された階調信号を映像駆動部２１へ順次出力する。
　制御部２３は、映像駆動部２１及び走査駆動部２２の動作を制御する。このために、制御部２３は、ゲートクロックを一定の周期で１個ずつ走査駆動部へ出力する。ゲートクロックは、階調信号がＭ個出力される都度、１個出力される。また、制御部２３は、ラッチストローブ信号を適宜のタイミングで映像駆動部２１へ出力する。ラッチストローブ信号は、ゲートクロックが１個出力される都度、１個出力される。 A plurality of gradation signals are sequentially input to the control unit 23. The control unit 23 sequentially outputs the input gradation signals to the video driving unit 21.
The control unit 23 controls the operations of the video drive unit 21 and the scan drive unit 22. For this purpose, the control unit 23 outputs the gate clock to the scan driving unit one by one at a constant cycle. One gate clock is output every time M gradation signals are output. In addition, the control unit 23 outputs a latch strobe signal to the video drive unit 21 at an appropriate timing. One latch strobe signal is output each time one gate clock is output.
　図４は、第１補正部２４及び第２補正部２５夫々の構成を示すブロック図である。
　第１補正部２４には、複数個の階調信号が順次入力される。第１補正部２４に入力される階調信号は、例えば、図示しないアンテナを介して外部からテレビジョン放送波を受信し、受信したテレビジョン放送波を放送信号に変換し、変換した放送信号に所定の信号処理を施したものである。つまり、この階調信号が示す階調値は、入力階調値である。
　なお、第１補正部２４に入力される階調信号は、入力階調値を適宜に補正したものであってもよい。 FIG. 4 is a block diagram illustrating the configuration of each of the first correction unit 24 and the second correction unit 25.
A plurality of gradation signals are sequentially input to the first correction unit 24. The gradation signal input to the first correction unit 24 receives, for example, a television broadcast wave from the outside via an antenna (not shown), converts the received television broadcast wave into a broadcast signal, and converts it into a converted broadcast signal. The signal is subjected to predetermined signal processing. That is, the gradation value indicated by the gradation signal is an input gradation value.
Note that the gradation signal input to the first correction unit 24 may be one obtained by appropriately correcting the input gradation value.
　第１補正部２４は、一時記憶部２４１、ルックアップテーブル２４２（以下、ＬＵＴ２４２という）、及び演算部２４３を備えている。第１補正部２４に入力された階調信号は、一時記憶部２４１及び演算部２４３に与えられる。 The first correction unit 24 includes a temporary storage unit 241, a lookup table 242 (hereinafter referred to as LUT 242), and a calculation unit 243. The gradation signal input to the first correction unit 24 is given to the temporary storage unit 241 and the calculation unit 243.
　映像を表示する前の一時記憶部２４１には、デフォルトとして例えば階調値“０”が記憶される。一時記憶部２４１は、第１補正部２４に階調信号が入力される都度、入力された階調信号が示す階調値（注目画素の入力階調値）を記憶すると共に、前回記憶した階調値（デフォルトの階調値か、又は、前段画素の入力階調値）を演算部２４３に与える。 For example, the gradation value “0” is stored as a default in the temporary storage unit 241 before displaying the video. The temporary storage unit 241 stores the gradation value (input gradation value of the target pixel) indicated by the input gradation signal each time the gradation signal is input to the first correction unit 24 and the previously stored level. The tone value (the default tone value or the input tone value of the preceding pixel) is given to the calculation unit 243.
　ＬＵＴ２４２は、図示しない不揮発性メモリに記憶されたデータテーブルである。ＬＵＴ２４２には、注目画素の入力階調値と、前段画素の入力階調値と、これらの組み合わせ１つにつき１個の第１補正後階調値（後述）とが関連付けて記憶してある。
　第１補正後階調値は、注目画素の入力階調値と前段画素の入力階調値とに基づいて、注目画素の入力階調値を補正したものであり、予めＬＵＴ２４２に記憶してある。 The LUT 242 is a data table stored in a nonvolatile memory (not shown). The LUT 242 stores an input tone value of the target pixel, an input tone value of the preceding pixel, and one first corrected tone value (described later) for each combination thereof.
The first corrected gradation value is obtained by correcting the input gradation value of the target pixel based on the input gradation value of the target pixel and the input gradation value of the preceding pixel, and is stored in the LUT 242 in advance. .
　本実施の形態では、注目画素の入力階調値が前段画素の入力階調値よりも高い場合、第１補正後階調値は注目画素の入力階調値よりも高く、注目画素の入力階調値が前段画素の入力階調値よりも低い場合、第１補正後階調値は注目画素の入力階調値よりも低い。注目画素の入力階調値と前段画素の入力階調値との差の絶対値が大きいほど、注目画素の入力階調値と第１補正後階調値との差の絶対値は大きい。注目画素の入力階調値と前段画素の入力階調値とが等しい場合、注目画素の入力階調値と第１補正後階調値とは等しい。 In the present embodiment, when the input gradation value of the target pixel is higher than the input gradation value of the preceding pixel, the first corrected gradation value is higher than the input gradation value of the target pixel, and the input level of the target pixel is When the tone value is lower than the input tone value of the preceding pixel, the first corrected tone value is lower than the input tone value of the target pixel. The larger the absolute value of the difference between the input tone value of the target pixel and the input tone value of the previous pixel, the greater the absolute value of the difference between the input tone value of the target pixel and the first corrected tone value. When the input tone value of the target pixel is equal to the input tone value of the preceding pixel, the input tone value of the target pixel is equal to the first corrected tone value.
　第１補正部２４の外部から演算部２４３に与えられた階調信号が示す階調値は注目画素の入力階調値である。一時記憶部２４１から演算部２４３に与えられた階調値は、前段画素の入力階調値として扱われる。演算部２４３は、第１補正部２４に階調信号が入力される都度、ＬＵＴ２４２を参照し、演算部２４３に与えられた注目画素の入力階調値と前段画素の入力階調値との組み合わせに関連付けられた第１補正後階調値を求める。演算部２４３は、求めた第１補正後階調値を示す階調信号を、第２補正部２５へ出力する。 The gradation value indicated by the gradation signal given from the outside of the first correction unit 24 to the calculation unit 243 is the input gradation value of the target pixel. The gradation value given from the temporary storage unit 241 to the calculation unit 243 is handled as the input gradation value of the preceding pixel. The calculation unit 243 refers to the LUT 242 every time a gradation signal is input to the first correction unit 24, and combines the input gradation value of the target pixel and the input gradation value of the preceding pixel given to the calculation unit 243. The first corrected gradation value associated with is obtained. The calculation unit 243 outputs a gradation signal indicating the obtained first corrected gradation value to the second correction unit 25.
　第１補正部２４による補正は、映像信号線１１を流れる映像信号に生じる波形なまりのうち、注目画素の入力階調値と前段画素の入力階調値との差に起因するものを抑制する目的で行なわれる。前段映像信号の振幅が注目映像信号の振幅よりも大きい／小さいせいで、映像信号線１１を流れる映像信号の振幅が入力階調値に対応する振幅よりも大きく／小さくなる（即ち波形なまりが生じる）のであるから、第１補正後階調値を注目画素の入力階調値よりも小さく／大きくすれば、画素電極１４に実際に与えられる映像信号の振幅を適宜に減少／増大させる（即ち波形なまりを抑制する）ことができる。 The correction by the first correction unit 24 suppresses the waveform rounding generated in the video signal flowing through the video signal line 11 that is caused by the difference between the input tone value of the target pixel and the input tone value of the preceding pixel. It is done in. Because the amplitude of the preceding video signal is larger / smaller than the amplitude of the target video signal, the amplitude of the video signal flowing through the video signal line 11 is larger / smaller than the amplitude corresponding to the input gradation value (that is, waveform rounding occurs). Therefore, if the gradation value after the first correction is made smaller / larger than the input gradation value of the target pixel, the amplitude of the video signal actually applied to the pixel electrode 14 is appropriately reduced / increased (that is, the waveform). Curbing).
　第２補正部２５には、第１補正部２４から複数個の階調信号が順次入力される。この階調信号が示す階調値は、第１補正後階調値である。
　第２補正部２５は、注目画素に対応する画素電極１４（以下、注目画素電極１４という）の映像駆動部２１からの遠近に応じて、第１補正後階調値を更に補正する。第１補正後階調値を更に補正したものを、以下では第２補正後階調値という。 A plurality of gradation signals are sequentially input from the first correction unit 24 to the second correction unit 25. The gradation value indicated by the gradation signal is the first corrected gradation value.
The second correction unit 25 further corrects the first corrected gradation value in accordance with the distance from the video driving unit 21 of the pixel electrode 14 (hereinafter referred to as the target pixel electrode 14) corresponding to the target pixel. The further corrected gradation value after the first correction is hereinafter referred to as a second corrected gradation value.
　具体的には、第２補正部２５は、注目画素電極１４が映像駆動部２１から遠い場合の第２補正後階調値が、注目画素電極１４が映像駆動部２１に近い場合の第２補正後階調値よりも高くなるよう第２補正後階調値を演算する。
　何故ならば、映像信号線１１に入力された映像信号の立ち上がり時間は、映像信号線１１の電気抵抗及び静電容量等の悪影響によって、映像駆動部２１から遠ざかるに連れて長期化する（即ち波形なまりが悪化する）からである。この波形なまりを打ち消すために、注目画素電極１４が映像駆動部２１から遠い場合には、注目画素電極１４が映像駆動部２１に近い場合よりも第２補正後階調値を高めにする必要がある。 Specifically, the second correction unit 25 performs the second correction when the target pixel electrode 14 is far from the video driving unit 21 and the second corrected gradation value when the target pixel electrode 14 is close to the video driving unit 21. The second corrected gradation value is calculated so as to be higher than the subsequent gradation value.
This is because the rise time of the video signal input to the video signal line 11 becomes longer as it moves away from the video drive unit 21 due to adverse effects such as electrical resistance and capacitance of the video signal line 11 (that is, the waveform). This is because the rounding gets worse. In order to cancel this rounding of the waveform, when the target pixel electrode 14 is far from the video driving unit 21, it is necessary to make the second corrected gradation value higher than when the target pixel electrode 14 is close to the video driving unit 21. is there.
　本実施の形態の第２補正部２５は、注目画素電極１４が映像駆動部２１から遠い場合（即ち注目画素電極１４の映像駆動部２１からの距離が長い場合）の第２補正後階調値は第１補正後階調値よりも高くし、注目画素電極１４が映像駆動部２１に近い場合（即ち注目画素電極１４の映像駆動部２１からの距離が短い場合）の第２補正後階調値は第１補正後階調値よりも低くする。注目画素電極１４が映像駆動部２１から遠いとも近いとも言えない場合（即ち注目画素電極１４の映像駆動部２１からの距離が中程度である場合）、第２補正部２５は、第２補正後階調値を第１補正後階調値に等しくする。 The second correction unit 25 of the present embodiment is the second corrected gradation value when the pixel of interest electrode 14 is far from the video driver 21 (that is, when the pixel electrode 14 of interest is long from the video driver 21). Is higher than the first corrected gradation value, and the second corrected gradation when the pixel electrode 14 of interest is close to the video driver 21 (that is, when the distance of the pixel electrode 14 from the video driver 21 is short). The value is set lower than the first corrected gradation value. When it cannot be said that the target pixel electrode 14 is far from or close to the video driving unit 21 (that is, when the distance of the target pixel electrode 14 from the video driving unit 21 is medium), the second correction unit 25 performs the second correction. The gradation value is made equal to the first corrected gradation value.
　このために、第２補正部２５は、列カウンタ２５１、行カウンタ２５２、係数テーブル２５３、及び演算部２５４を備えている。第２補正部２５に入力された階調信号は、列カウンタ２５１及び演算部２５４に与えられる。
　本実施の形態では、走査信号線１２，１２，…に個別の行番号が割り振られている。走査信号線１２，１２，…夫々に割り振られている行番号は、上側の走査信号線１２から順に“１”，“２”，…，“Ｎ”である。行番号が大きい走査信号線１２ほど、映像駆動部２１から遠い。 For this purpose, the second correction unit 25 includes a column counter 251, a row counter 252, a coefficient table 253, and a calculation unit 254. The gradation signal input to the second correction unit 25 is given to the column counter 251 and the calculation unit 254.
In this embodiment, individual row numbers are assigned to the scanning signal lines 12, 12,. The row numbers assigned to the scanning signal lines 12, 12,... Are “1”, “2”,. The scanning signal line 12 with the larger row number is farther from the video driver 21.
　映像を表示する前の列カウンタ２５１の計数結果は“０”にリセットされる。列カウンタ２５１は、階調信号が与えられる都度、計数結果を“１”インクリメントする。計数結果が“Ｍ”に達した場合、列カウンタ２５１は、行カウンタ２５２に所定の計数信号を与え、計数結果を“０”にリセットする。 The count result of the column counter 251 before displaying the video is reset to “0”. The column counter 251 increments the count result by “1” every time a gradation signal is given. When the count result reaches “M”, the column counter 251 gives a predetermined count signal to the row counter 252 and resets the count result to “0”.
　映像を表示する前の行カウンタ２５２の計数結果は“１”にリセットされる。行カウンタ２５２は、計数信号が与えられる都度、計数結果を“１”インクリメントする。計数結果が“Ｎ”に達している状態で更に計数信号が与えられた場合、行カウンタ２５２は計数結果を“１”にリセットする。
　行カウンタ２５２の係数結果は、注目画素電極１４に対応する走査信号線１２の行番号である。 The count result of the row counter 252 before displaying the video is reset to “1”. The row counter 252 increments the count result by “1” every time the count signal is given. When a count signal is further given in a state where the count result has reached “N”, the row counter 252 resets the count result to “1”.
The coefficient result of the row counter 252 is the row number of the scanning signal line 12 corresponding to the target pixel electrode 14.
　係数テーブル２５３は、図示しない不揮発性メモリに記憶されたデータテーブルである。係数テーブル２５３には、行番号と、後述する補正係数とが関連付けて記憶してある。
　第２補正後階調値は、第１補正後階調値に補正係数を乗じることによって得られる。行番号が大きいほど、関連付けられている補正係数は大きい。 The coefficient table 253 is a data table stored in a nonvolatile memory (not shown). The coefficient table 253 stores row numbers and correction coefficients described later in association with each other.
The second corrected gradation value is obtained by multiplying the first corrected gradation value by a correction coefficient. The greater the line number, the greater the associated correction factor.
　例えば、係数テーブル２５３には、第１～第４の補正係数が記憶してある。行番号“１”～“Ｎ／４”には、第１の補正係数が関連付けられており、第１の補正係数は“１．０”より小さい（具体的には“０．９”）。行番号“Ｎ／４＋１”～“Ｎ／２”には、第２の補正係数が関連付けられており、第２の補正係数は１．０に等しい。行番号“Ｎ／２＋１”～“Ｎ×３／４”には、第３の補正係数が関連付けられており、第３の補正係数は“１．０”より大きい（具体的には“１．１”）行番号“Ｎ×３／４＋１”～“Ｎ”には、第４の補正係数が関連付けられており、第４の補正係数は第３の補正係数より大きい（具体的には“１．２”）。 For example, the coefficient table 253 stores first to fourth correction coefficients. The row numbers “1” to “N / 4” are associated with the first correction coefficient, and the first correction coefficient is smaller than “1.0” (specifically “0.9”). The row numbers “N / 4 + 1” to “N / 2” are associated with the second correction coefficient, and the second correction coefficient is equal to 1.0. Line numbers “N / 2 + 1” to “N × 3/4” are associated with a third correction coefficient, and the third correction coefficient is greater than “1.0” (specifically, “1. 1 ”) The fourth correction coefficient is associated with the row numbers“ N × 3/4 + 1 ”to“ N ”, and the fourth correction coefficient is larger than the third correction coefficient (specifically,“ 1 ”). .2 ").
　なお、補正係数の、係数テーブル２５３に記憶される個数は、２個又は３個でもよく、５個以上でもよい。ただし、補正係数の個数が過剰な（例えば行番号ごとに異なる補正係数が設定してある）場合、補正係数の設定工程が煩雑になるだけでなく、係数テーブル２５３を記憶するために、記憶容量が過大な不揮発メモリを要する。
　第１～第４の補正係数は、第１～第４の順に大きくなる“１．０”以上の数値でもよく、第１～第４の順に小さくなる“１．０”以下の数値でもよい。 The number of correction coefficients stored in the coefficient table 253 may be two or three, or five or more. However, when the number of correction coefficients is excessive (for example, a different correction coefficient is set for each row number), not only the correction coefficient setting process becomes complicated, but also a storage capacity for storing the coefficient table 253. Requires an excessively large amount of non-volatile memory.
The first to fourth correction coefficients may be numerical values of “1.0” or higher that increase in the first to fourth order, or numerical values of “1.0” or lower that decrease in the first to fourth order.
　演算部２５４は、階調信号が与えられる都度、まず、行カウンタ２５２から計数結果（即ち行番号）を取得する。次に、演算部２５４は、取得した行番号を用いて係数テーブル２５３を参照し、補正係数を求める。次いで、演算部２５４は、求めた補正係数と、与えられた階調信号が示す第１補正後階調値とを乗算する。ただし、乗算結果が“２５５”より大きい場合、演算部２５４は乗算結果を“２５５”とする。次に、演算部２５４は、求めた乗算結果の小数点以下を切り捨てることによって第２補正後階調値を求める。最後に、演算部２５４は、求めた第２補正後階調値を示す階調信号を制御部２３へ出力する。 The calculation unit 254 first obtains a count result (that is, a row number) from the row counter 252 each time a gradation signal is given. Next, the calculation unit 254 refers to the coefficient table 253 using the acquired line number and obtains a correction coefficient. Next, the arithmetic unit 254 multiplies the obtained correction coefficient by the first corrected gradation value indicated by the given gradation signal. However, when the multiplication result is larger than “255”, the calculation unit 254 sets the multiplication result to “255”. Next, the computing unit 254 obtains the second corrected gradation value by rounding down the decimal part of the obtained multiplication result. Finally, the calculation unit 254 outputs a gradation signal indicating the obtained second corrected gradation value to the control unit 23.
　つまり、制御部２３に入力された階調信号は、そのまま映像駆動部２１に入力される。従って、映像駆動部２１に入力された階調信号が示す階調値は、第２補正後階調値である。故に、映像駆動部２１は、第２補正後階調値に応じた映像信号を映像信号線１１，１１，…に入力する。
　この結果、液晶表示パネル１に表示される映像において、各画素の出力階調値は入力階調値と大差ない。即ち、表示品位を向上させることができる。 That is, the gradation signal input to the control unit 23 is input to the video drive unit 21 as it is. Therefore, the gradation value indicated by the gradation signal input to the video driver 21 is the second corrected gradation value. Therefore, the video drive unit 21 inputs a video signal corresponding to the second corrected gradation value to the video signal lines 11, 11,.
As a result, in the image displayed on the liquid crystal display panel 1, the output gradation value of each pixel is not significantly different from the input gradation value. That is, display quality can be improved.
　以上のような表示装置２が備える画素電極１４，１４，…の配置は、一般的な表示装置の画素電極と同様である。つまり、表示品位を向上させるために特殊な構造を有している必要がないので、表示装置２の製造コストを抑制することができる。 The arrangement of the pixel electrodes 14, 14,... Included in the display device 2 as described above is the same as the pixel electrodes of a general display device. That is, since it is not necessary to have a special structure in order to improve display quality, the manufacturing cost of the display device 2 can be suppressed.
実施の形態　２．
　図５は、本発明の実施の形態２に係る表示装置２の制御系の構成を示すブロック図である。図５は実施の形態１の図３に対応する。
　本実施の形態の表示装置２は、実施の形態１の表示装置２と略同様の構成である。以下では、実施の形態１との差異について説明し、その他、実施の形態１に対応する部分には同一符号を付してそれらの説明を省略する。 Embodiment 2. FIG.
FIG. 5 is a block diagram showing the configuration of the control system of display device 2 according to Embodiment 2 of the present invention. FIG. 5 corresponds to FIG. 3 of the first embodiment.
The display device 2 of the present embodiment has substantially the same configuration as the display device 2 of the first embodiment. Hereinafter, differences from the first embodiment will be described, and other parts corresponding to those of the first embodiment are denoted by the same reference numerals and description thereof will be omitted.
　実施の形態１の表示装置２はＫ個の映像駆動部２１，２１，…を備えるが、本実施の形態の表示装置２は｛２×Ｋ｝個の映像駆動部２１，２１，…を備える。以下では説明を簡単にするために、表示装置２が２個の映像駆動部２１，２１を備えているものとして説明する。
　２個の内、一方の映像駆動部２１は、映像信号線１１，１１，…の上端部に接続されており、他方の映像駆動部２１は、映像信号線１１，１１，…の下端部に接続されている。
　階調信号及びラッチストローブ信号は、制御部２３から映像駆動部２１，２１夫々に入力される。映像信号線１１，１１，…夫々には、上端部側及び下端部側から同一の映像信号が同時的に入力される。 The display device 2 according to the first embodiment includes K video drive units 21, 21,..., Whereas the display device 2 according to the present embodiment includes {2 × K} video drive units 21, 21,. . In the following, for the sake of simplicity of explanation, the display device 2 will be described as including two video driving units 21 and 21.
One of the two video drive units 21 is connected to the upper end of the video signal lines 11, 11,..., And the other video drive unit 21 is connected to the lower end of the video signal lines 11, 11,. It is connected.
The gradation signal and the latch strobe signal are input from the control unit 23 to each of the video drive units 21 and 21. The same video signal is simultaneously input to the video signal lines 11, 11,... From the upper end side and the lower end side.
　各画素電極１４の映像駆動部２１，２１からの遠近は、画素電極１４に対応する走査信号線１２の映像駆動部２１，２１からの遠近に対応する。画素電極１４に対応する走査信号線１２が映像駆動部２１，２１の何れか一方に近いほど、画素電極１４は映像駆動部２１に近い。一方、画素電極１４に対応する走査信号線１２が映像駆動部２１，２１の両方から近いほど、画素電極１４は映像駆動部２１から遠い。換言すれば、映像信号線１１の上端部又は下端部に接続されている画素電極１４は、映像駆動部２１，２１の何れかに近いが、映像信号線１１の上下方向中央部に接続されている画素電極１４は、映像駆動部２１，２１の何れからも遠い。 The perspective of each pixel electrode 14 from the video drive units 21, 21 corresponds to the perspective of the scanning signal line 12 corresponding to the pixel electrode 14 from the video drive units 21, 21. The closer the scanning signal line 12 corresponding to the pixel electrode 14 is to either one of the video driving units 21, 21, the closer the pixel electrode 14 is to the video driving unit 21. On the other hand, the closer the scanning signal line 12 corresponding to the pixel electrode 14 is from both of the video driving units 21, 21, the farther the pixel electrode 14 is from the video driving unit 21. In other words, the pixel electrode 14 connected to the upper end or the lower end of the video signal line 11 is close to either of the video drive units 21 and 21, but is connected to the vertical center of the video signal line 11. The pixel electrode 14 is far from either of the video drive units 21 and 21.
　走査駆動部２２は、ゲートクロックが入力される都度、上側（上側の映像駆動部２１に近い側）の走査信号線１２から順に、走査信号を出力する。
　第２補正部２５は、注目画素に対応する画素電極１４の映像駆動部２１，２１からの遠近に応じて、第１補正後階調値を更に補正する。 Each time the gate clock is input, the scanning drive unit 22 sequentially outputs scanning signals from the scanning signal line 12 on the upper side (side closer to the upper video driving unit 21).
The second correction unit 25 further corrects the first corrected gradation value in accordance with the distance from the video driving units 21 and 21 of the pixel electrode 14 corresponding to the target pixel.
　具体的には、第２補正部２５は、注目画素電極１４が映像駆動部２１，２１の両方から遠い場合の第２補正後階調値が、注目画素電極１４が映像駆動部２１，２１の何れか一方に近い場合の第２補正後階調値よりも高くなるよう第２補正後階調値を演算する。 Specifically, the second correction unit 25 determines the second corrected gradation value when the target pixel electrode 14 is far from both of the video drive units 21 and 21, and the target pixel electrode 14 is that of the video drive units 21 and 21. The second corrected gradation value is calculated so as to be higher than the second corrected gradation value when it is close to either one.
　このために、係数テーブル２５３には、例えば第１～第３の補正係数が記憶してある。行番号“１”～“Ｎ／３”には、第１の補正係数が関連付けられており、第１の補正係数は“１．０”に等しい。行番号“Ｎ／３＋１”～“Ｎ×２／３”には、第２の補正係数が関連付けられており、第２の補正係数は１．０より大きい。行番号“Ｎ×２／３＋１”～“Ｎ”には、第３の補正係数が関連付けられており、第３の補正係数は“１．０”に等しい。
　以上のような表示装置２は、実施の形態１の表示装置２と同様の作用効果を奏する。 For this purpose, the coefficient table 253 stores, for example, first to third correction coefficients. The row numbers “1” to “N / 3” are associated with the first correction coefficient, and the first correction coefficient is equal to “1.0”. The row numbers “N / 3 + 1” to “N × 2/3” are associated with the second correction coefficient, and the second correction coefficient is larger than 1.0. A third correction coefficient is associated with the row numbers “N × 2/3 + 1” to “N”, and the third correction coefficient is equal to “1.0”.
The display device 2 as described above has the same operational effects as the display device 2 of the first embodiment.
実施の形態　３．
　図６は、本発明の実施の形態３に係る表示装置２が備える制御部２３の構成を示すブロック図である。
　本実施の形態の表示装置２は、実施の形態１の表示装置２と略同様の構成である。以下では、実施の形態１との差異について説明し、その他、実施の形態１に対応する部分には同一符号を付してそれらの説明を省略する。 Embodiment 3. FIG.
FIG. 6 is a block diagram showing a configuration of the control unit 23 provided in the display device 2 according to Embodiment 3 of the present invention.
The display device 2 of the present embodiment has substantially the same configuration as the display device 2 of the first embodiment. Hereinafter, differences from the first embodiment will be described, and other parts corresponding to those of the first embodiment are denoted by the same reference numerals and description thereof will be omitted.
　従来の表示装置においては、走査信号線１２に走査信号が入力される時点を基準にした映像信号線１１，１１，…に映像信号が入力されるタイミングは一定である。
　つまり、走査信号線１２に走査信号が入力されてから映像信号線１１，１１，…に映像信号が入力されるまでの経過時間を経過時間ｔとおくと、従来の表示装置の場合、経過時間ｔはｔ＝Ｔ（ＴはＴ≧０の定数）で一定である。 In the conventional display device, the timing at which the video signal is input to the video signal lines 11, 11,... With respect to the time point when the scanning signal is input to the scanning signal line 12 is constant.
In other words, if the elapsed time from when the scanning signal is input to the scanning signal line 12 to when the video signal is input to the video signal lines 11, 11,. t is constant at t = T (T is a constant of T ≧ 0).
　本実施の形態の表示装置２においては、走査信号線１２に走査信号が入力される時点を基準にした映像信号線１１，１１，…に映像信号が入力されるタイミングは、走査信号が入力される走査信号線１２の映像駆動部２１からの遠近（即ち、映像信号が与えられる画素電極１４，１４，…夫々の映像駆動部２１からの遠近）に応じて異なる。 In the display device 2 of the present embodiment, the scanning signal is input at the timing when the video signal is input to the video signal lines 11, 11,... Based on the time when the scanning signal is input to the scanning signal line 12. The scanning signal line 12 differs depending on the distance from the video drive unit 21 (that is, the perspective of the pixel electrodes 14, 14... To which the video signal is applied from the video drive unit 21).
　具体的には、映像駆動部２１に近い走査信号線１２に走査信号が入力される場合に、走査信号が入力される時点を基準にした映像信号線１１，１１，…に映像信号が入力されるタイミングは、映像駆動部２１から遠い走査信号線１２に走査信号が入力される場合に、走査信号が入力される時点を基準にした映像信号線１１，１１，…に映像信号が入力されるタイミングよりも遅い。
　つまり、映像駆動部２１から遠い走査信号線１２に走査信号が入力される場合、経過時間ｔはｔ＝Ｔf （Ｔf はＴf ≧０の定数）である。一方、映像駆動部２１に近い走査信号線１２に走査信号が入力される場合、経過時間ｔはｔ＝Ｔn （Ｔn はＴn ＞Ｔf の定数）である。 Specifically, when a scanning signal is input to the scanning signal line 12 close to the video driving unit 21, the video signal is input to the video signal lines 11, 11,. When the scanning signal is input to the scanning signal line 12 far from the video driver 21, the video signal is input to the video signal lines 11, 11,. Slower than timing.
That is, when a scanning signal is input to the scanning signal line 12 far from the video driver 21, the elapsed time t is t = Tf (Tf is a constant of Tf ≧ 0). On the other hand, when a scanning signal is input to the scanning signal line 12 close to the video driver 21, the elapsed time t is t = Tn (Tn is a constant of Tn> Tf).
　走査信号線１２に走査信号が入力されるタイミングは、走査駆動部２２にゲートクロックが入力されるタイミングに対応し、映像信号線１１，１１，…に映像信号が入力されるタイミングは、映像駆動部２１にラッチストローブ信号が入力されるタイミングに対応する。走査駆動部２２にゲートクロックが入力されるタイミングは、制御部２３から走査駆動部２２へゲートクロックが出力されるタイミングに対応し、映像駆動部２１にラッチストローブ信号が入力されるタイミングは、制御部２３から映像信号線１１，１１，…へ映像信号が出力されるタイミングに対応する。
　つまり、経過時間ｔは、走査駆動部２２へゲートクロックが出力されてから、映像信号線１１，１１，…へ映像信号が出力されるまでの経過時間に対応する。 The timing at which the scanning signal is input to the scanning signal line 12 corresponds to the timing at which the gate clock is input to the scanning drive unit 22, and the timing at which the video signal is input to the video signal lines 11, 11,. This corresponds to the timing at which the latch strobe signal is input to the unit 21. The timing at which the gate clock is input to the scan driver 22 corresponds to the timing at which the gate clock is output from the controller 23 to the scan driver 22, and the timing at which the latch strobe signal is input to the video driver 21 is controlled. This corresponds to the timing at which the video signal is output from the unit 23 to the video signal lines 11, 11,.
That is, the elapsed time t corresponds to the elapsed time from when the gate clock is output to the scan driver 22 until the video signal is output to the video signal lines 11, 11.
　制御部２３は、列カウンタ２３１、行カウンタ２３２、時間テーブル２３３、及び演算部２３４を備えている。制御部２３に入力された階調信号は、列カウンタ２３１及び演算部２３４に与えられる。
　列カウンタ２３１及び行カウンタ２３２の動作は、列カウンタ２５１及び行カウンタ２５２の動作と同様である。 The control unit 23 includes a column counter 231, a row counter 232, a time table 233, and a calculation unit 234. The gradation signal input to the control unit 23 is given to the column counter 231 and the calculation unit 234.
The operations of the column counter 231 and the row counter 232 are the same as the operations of the column counter 251 and the row counter 252.
　時間テーブル２３３は、図示しない不揮発性メモリに記憶されたデータテーブルである。時間テーブル２３３には、行番号と、経過時間ｔとが関連付けて記憶してある。
　行番号が大きいほど、関連付けられている経過時間ｔは小さい。
　例えば、時間テーブル２３３には、第１～第３の経過時間ｔが記憶してある。行番号“１”～“Ｎ／３”には、第１の経過時間ｔが関連付けられており、第１の経過時間ｔはｔ＝Ｔn である。行番号“Ｎ／３＋１”～“Ｎ×２／３”には、第２の経過時間ｔが関連付けられており、第２の経過時間ｔはｔ＝Ｔm である（０≦Ｔf ＜Ｔm ＜Ｔn ）。行番号“Ｎ×２／３＋１”～“Ｎ”には、第３の経過時間ｔが関連付けられており、第３の経過時間ｔはｔ＝Ｔf である。 The time table 233 is a data table stored in a nonvolatile memory (not shown). In the time table 233, the row number and the elapsed time t are stored in association with each other.
The larger the line number, the smaller the associated elapsed time t.
For example, the time table 233 stores first to third elapsed times t. The line numbers “1” to “N / 3” are associated with the first elapsed time t, and the first elapsed time t is t = Tn. The row numbers “N / 3 + 1” to “N × 2/3” are associated with the second elapsed time t, and the second elapsed time t is t = Tm (0 ≦ Tf <Tm <Tn). ). The row numbers “N × 2/3 + 1” to “N” are associated with the third elapsed time t, and the third elapsed time t is t = Tf.
　なお、経過時間ｔの、時間テーブル２３３に記憶される個数は、２個でもよく、４個以上でもよい。しかしながら、経過時間ｔの個数が過剰な（例えば行番号ごとに異なる経過時間ｔが設定してある）場合、経過時間ｔの設定工程が煩雑になるだけでなく、時間テーブル２３３を記憶するために、記憶容量が過大な不揮発メモリを要する。 Note that the number of elapsed time t stored in the time table 233 may be two or four or more. However, when the number of elapsed times t is excessive (for example, a different elapsed time t is set for each row number), not only the setting process of the elapsed time t becomes complicated, but also the time table 233 is stored. A non-volatile memory having an excessive storage capacity is required.
　演算部２３４は、階調信号が与えられる都度、与えられた階調信号を、そのまま映像駆動部２１へ出力する。また、演算部２３４は、行カウンタ２３２から計数結果（即ち行番号）を取得する。次に、演算部２３４は、取得した行番号を用いて時間テーブル２３３を参照し、経過時間ｔを求める。更に、演算部２３４は、所定のタイミングで走査駆動部２２へゲートクロックを出力すると共に、ゲートクロックの出力時点からの経過時間を計時開始する。
　そして、演算部２３４は、計時結果が経過時間ｔに達するまでラッチストローブ信号の出力を待機し、計時結果が経過時間ｔ以上であった場合に、映像駆動部２１へラッチストローブ信号を出力する。最後に、演算部２３４は、経過時間の計時を終了し、計時結果を“０”にリセットする。 The calculation unit 234 outputs the given gradation signal to the video driving unit 21 as it is every time the gradation signal is given. In addition, the calculation unit 234 acquires a count result (that is, a row number) from the row counter 232. Next, the computing unit 234 refers to the time table 233 using the acquired line number and obtains the elapsed time t. Further, the calculation unit 234 outputs a gate clock to the scan driving unit 22 at a predetermined timing, and starts measuring the elapsed time from the output time of the gate clock.
Then, the calculation unit 234 waits for the output of the latch strobe signal until the time measurement result reaches the elapsed time t, and outputs the latch strobe signal to the video drive unit 21 when the time measurement result is equal to or longer than the elapsed time t. Finally, the calculation unit 234 ends the elapsed time measurement and resets the time measurement result to “0”.
　図７及び図８は、表示装置２におけるゲートクロック、走査信号、ラッチストローブ信号、及び映像信号夫々の出力のタイミングを示すタイミングチャートである。図７は走査信号線１２が映像駆動部２１に近い場合を示し、図８は走査信号線１２が映像駆動部２１から遠い場合を示している。図８ではＴf ＝０の場合を例示している。
　図９及び図１０は、従来の表示装置におけるゲートクロック、走査信号、ラッチストローブ信号、及び映像信号夫々の出力のタイミングを示すタイミングチャートである。図９及び図１０は図７及び図８に対応する。図９及び図１０ではＴ＞０の場合を例示している。 7 and 8 are timing charts showing the output timings of the gate clock, the scanning signal, the latch strobe signal, and the video signal in the display device 2, respectively. FIG. 7 shows the case where the scanning signal line 12 is close to the video driving unit 21, and FIG. 8 shows the case where the scanning signal line 12 is far from the video driving unit 21. FIG. 8 illustrates a case where Tf = 0.
9 and 10 are timing charts showing the output timings of the gate clock, the scanning signal, the latch strobe signal, and the video signal in the conventional display device. 9 and 10 correspond to FIGS. 7 and 8. 9 and 10 illustrate the case where T> 0.
　図７及び図９は、行番号“１”，“２”，“３”の走査信号線１２，１２，１２に対応する画素電極１４，１４，１４に、同一の映像信号線１１から階調値“０”，“２５５”，“２５５”の映像信号が与えられる場合を例示している。これは、画素電極１４が映像駆動部２１に近いので、映像信号線１１，１１，…に映像信号が入力されるタイミングが遅い場合の例である。図７及び図９に示す走査信号は、行番号“２”の走査信号線１２に与えられるものである。 7 and 9 show gradations from the same video signal line 11 to the pixel electrodes 14, 14, 14 corresponding to the scanning signal lines 12, 12, 12 of the row numbers “1”, “2”, “3”. A case where video signals having values “0”, “255”, and “255” are given is illustrated. This is an example of the case where the timing at which the video signal is input to the video signal lines 11, 11,... Is late because the pixel electrode 14 is close to the video drive unit 21. The scanning signals shown in FIGS. 7 and 9 are given to the scanning signal line 12 of the row number “2”.
　図８及び図１０は行番号“Ｎ×２／３＋１”，“Ｎ×２／３＋２”，“Ｎ×２／３＋３”の走査信号線１２，１２，１２に対応する画素電極１４，１４，１４に、同一の映像信号線１１から階調値“０”，“２５５”，“２５５”の映像信号が与えられる場合を例示している。これは、画素電極１４が映像駆動部２１から遠いので、映像信号線１１，１１，…に映像信号が入力されるタイミングが早い場合の例である。図８及び図１０に示す走査信号は、行番号“Ｎ×２／３＋２”の走査信号線１２に与えられるものである。 8 and 10 show pixel electrodes 14, 14, 14 corresponding to the scanning signal lines 12, 12, 12 of row numbers “N × 2/3 + 1”, “N × 2/3 + 2”, “N × 2/3 + 3”. In the example, the video signals having the gradation values “0”, “255”, and “255” are given from the same video signal line 11. This is an example of the case where the timing at which the video signal is input to the video signal lines 11, 11,... Is early because the pixel electrode 14 is far from the video drive unit 21. The scanning signals shown in FIGS. 8 and 10 are applied to the scanning signal line 12 of the row number “N × 2/3 + 2”.
　従来、図９に示すように、行番号“２”の走査信号線１２に対応する画素電極１４には、｛Ｈ－Ｔ｝時間の間、映像信号が与えられる。この画素電極１４に与えられる映像信号には、各画素電極１４の映像駆動部２１からの遠近に起因する波形なまりがほとんど生じていない。つまり、この映像信号の振幅が、階調値“０”に対応する振幅から階調値“２５５”に対応する振幅（以下、振幅Ａという）に収束するまでの時間は短い。従って、この画素電極１４には、振幅Ａを有する映像信号が長時間与えられるので、この画素電極１４と透明電極との間にある液晶には、階調値“２５５”に対応する電圧が長時間印加される。 Conventionally, as shown in FIG. 9, a video signal is supplied to the pixel electrode 14 corresponding to the scanning signal line 12 of the row number “2” for {HT} time. In the video signal applied to the pixel electrode 14, the waveform rounding due to the distance from the video driving unit 21 of each pixel electrode 14 hardly occurs. That is, the time until the amplitude of the video signal converges from the amplitude corresponding to the gradation value “0” to the amplitude corresponding to the gradation value “255” (hereinafter referred to as amplitude A) is short. Therefore, since a video signal having an amplitude A is given to the pixel electrode 14 for a long time, a voltage corresponding to the gradation value “255” is long in the liquid crystal between the pixel electrode 14 and the transparent electrode. Applied for hours.
　一方、図１０に示すように、行番号“Ｎ×２／３＋２”の走査信号線１２に対応する画素電極１４には、｛Ｈ－Ｔ｝時間の間、映像信号が与えられる。この画素電極１４に与えられる映像信号には、映像駆動部２１からの遠近に起因する波形なまりが大幅に生じている。つまり、この映像信号の振幅が、階調値“０”に対応する振幅から振幅Ａに収束するまでの時間は長い。従って、この画素電極１４には、振幅Ａを有する映像信号が短時間しか与えられないので、この画素電極１４と透明電極との間にある液晶には、階調値“２５５”に対応する電圧が短時間しか印加されない。 On the other hand, as shown in FIG. 10, a video signal is given to the pixel electrode 14 corresponding to the scanning signal line 12 of the row number “N × 2/3 + 2” for {HT} time. In the video signal given to the pixel electrode 14, a waveform rounding due to the distance from the video drive unit 21 is significantly generated. That is, it takes a long time for the amplitude of the video signal to converge to the amplitude A from the amplitude corresponding to the gradation value “0”. Therefore, since a video signal having an amplitude A is given to the pixel electrode 14 only for a short time, a voltage corresponding to the gradation value “255” is applied to the liquid crystal between the pixel electrode 14 and the transparent electrode. Is applied only for a short time.
　以上のことから、液晶表示パネル１の上部にある画素は階調値“０”から階調値“２５５”に達するのに対し、液晶表示パネル１の下部にある画素は階調値“０”から階調値“２５５”に達しない虞がある。このような画素毎の階調値の差異は、表示品位を悪化させる。 From the above, the pixel at the upper part of the liquid crystal display panel 1 reaches the gradation value “255” from the gradation value “0”, whereas the pixel at the lower part of the liquid crystal display panel 1 has the gradation value “0”. Therefore, the gradation value “255” may not be reached. Such a difference in gradation value for each pixel deteriorates display quality.
　本実施の形態では、図７に示すように、行番号“２”の走査信号線１２に対応する画素電極１４には、｛Ｈ－Ｔn ｝時間の間、映像信号が与えられる。この画素電極１４に与えられる映像信号には、映像駆動部２１からの遠近に起因する波形なまりがほとんど生じていない。従って、この画素電極１４には、振幅Ａを有する映像信号が必要十分な時間だけ与えられるので、この画素電極１４と透明電極との間にある液晶には、階調値“２５５”に対応する電圧が必要十分な時間だけ印加される。 In the present embodiment, as shown in FIG. 7, a video signal is applied to the pixel electrode 14 corresponding to the scanning signal line 12 of the row number “2” for {H−Tn} time. In the video signal applied to the pixel electrode 14, there is almost no waveform rounding due to the distance from the video drive unit 21. Accordingly, since the video signal having the amplitude A is given to the pixel electrode 14 for a necessary and sufficient time, the liquid crystal between the pixel electrode 14 and the transparent electrode corresponds to the gradation value “255”. The voltage is applied for a necessary and sufficient time.
　一方、図８に示すように、行番号“Ｎ×２／３＋２”の走査信号線１２に対応する画素電極１４には、｛Ｈ－Ｔf ｝時間の間、映像信号が与えられる。｛Ｈ－Ｔf ｝時間は｛Ｈ－Ｔn ｝時間よりも長時間であるが、この画素電極１４に与えられる映像信号には、映像駆動部２１からの遠近に起因する波形なまりが大幅に生じている。従って、この画素電極１４には、振幅Ａを有する映像信号が必要十分な時間（行番号“２”の走査信号線１２に対応する画素電極１４に振幅Ａを有する映像信号が与えられる時間と同程度の時間）だけ与えられるので、この画素電極１４と透明電極との間にある液晶には、階調値“２５５”に対応する電圧が必要十分な時間だけ印加される。 On the other hand, as shown in FIG. 8, a video signal is given to the pixel electrode 14 corresponding to the scanning signal line 12 of the row number “N × 2/3 + 2” for {H−Tf} time. The {H−Tf} time is longer than the {H−Tn} time, but the video signal applied to the pixel electrode 14 has a waveform rounding caused by the distance from the video driver 21. Yes. Therefore, the pixel electrode 14 has a necessary and sufficient time for the video signal having the amplitude A (the same time as the video signal having the amplitude A is applied to the pixel electrode 14 corresponding to the scanning signal line 12 of the row number “2”). The voltage corresponding to the gradation value “255” is applied to the liquid crystal between the pixel electrode 14 and the transparent electrode for a necessary and sufficient time.
　以上のことから、液晶表示パネル１の上部にある画素も液晶表示パネル１の下部にある画素も階調値“０”から階調値“２５５”に達する。つまり、液晶表示パネル１に表示される映像において、各画素の出力階調値は入力階調値と大差ない。即ち、表示品位を向上させることができる。 From the above, the pixel at the upper part of the liquid crystal display panel 1 and the pixel at the lower part of the liquid crystal display panel 1 reach the gradation value “255” from the gradation value “0”. That is, in the image displayed on the liquid crystal display panel 1, the output gradation value of each pixel is not much different from the input gradation value. That is, display quality can be improved.
　ところで、行番号“３”の走査信号線１２に対応する画素電極１４及び行番号“Ｎ×２／３＋３”の走査信号線１２に対応する画素電極１４夫々には、波形なまりが生じていない映像信号が与えられる。何故ならば、前段入力階調値と注目入力階調値とが同じだからである。このような場合においても、画素電極１４と透明電極との間にある液晶には、階調値“２５５”に対応する電圧が必要十分な時間だけ印加されるので、各画素電極１４に対応する画素の入力階調値と出力階調値とが大幅に異なる虞はない。 By the way, an image in which no waveform rounding occurs in the pixel electrode 14 corresponding to the scanning signal line 12 of the row number “3” and the pixel electrode 14 corresponding to the scanning signal line 12 of the row number “N × 2/3 + 3”. A signal is given. This is because the previous input tone value and the target input tone value are the same. Even in such a case, since the voltage corresponding to the gradation value “255” is applied to the liquid crystal between the pixel electrode 14 and the transparent electrode for a necessary and sufficient time, it corresponds to each pixel electrode 14. There is no possibility that the input gradation value and the output gradation value of the pixel are significantly different.
　以上のような表示装置２は、映像信号を映像信号線に入力するタイミングの調整によって、各画素電極１４の映像駆動部２１からの遠近に起因する波形なまりの悪影響を更に抑制する。このような表示装置２は、実施の形態１の表示装置２が備える制御部２３を本実施の形態の制御部２３に替えれば、簡便に得ることができる。つまり、表示品位を更に向上させるために新たなハードウェアを追加する必要がないので、表示装置２の製造コストを抑制することができる。 The display device 2 as described above further suppresses the adverse effect of waveform rounding caused by the distance from the video driving unit 21 of each pixel electrode 14 by adjusting the timing of inputting the video signal to the video signal line. Such a display device 2 can be easily obtained by replacing the control unit 23 included in the display device 2 of the first embodiment with the control unit 23 of the present embodiment. That is, it is not necessary to add new hardware in order to further improve the display quality, so that the manufacturing cost of the display device 2 can be suppressed.
実施の形態　４．
　図１１は、本発明の実施の形態４に係る表示装置２が備える制御部２６の構成を示すブロック図である。
　本実施の形態の表示装置２は、実施の形態１の表示装置２と略同様の構成である。以下では、実施の形態１との差異について説明し、その他、実施の形態１に対応する部分には同一符号を付してそれらの説明を省略する。 Embodiment 4 FIG.
FIG. 11 is a block diagram showing a configuration of the control unit 26 provided in the display device 2 according to Embodiment 4 of the present invention.
The display device 2 of the present embodiment has substantially the same configuration as the display device 2 of the first embodiment. Hereinafter, differences from the first embodiment will be described, and other parts corresponding to those of the first embodiment are denoted by the same reference numerals and description thereof will be omitted.
　表示装置２は、実施の形態１の制御部２３、第１補正部２４、及び第２補正部２５を備えておらず、制御部２６を備えている。
　入力階調値を示す階調信号は、実施の形態１では第１補正部２４に入力されるが、本実施の形態では制御部２６に入力される。
　制御部２６は、不揮発性メモリ２６１、揮発性メモリ２６２、及び演算部２６３を備えている。 The display device 2 does not include the control unit 23, the first correction unit 24, and the second correction unit 25 of the first embodiment, but includes the control unit 26.
The gradation signal indicating the input gradation value is input to the first correction unit 24 in the first embodiment, but is input to the control unit 26 in the present embodiment.
The control unit 26 includes a nonvolatile memory 261, a volatile memory 262, and a calculation unit 263.
　不揮発性メモリ２６１には、第１補正データ及び第２補正データと図示しない定数データとが記憶してある。
　第１補正データは、注目画素の入力階調値と前段画素の入力階調値とに基づいて第１補正後階調値を演算するための関数及び／又はデータテーブル等である。以下では、第１補正データに、注目入力階調値が前段入力階調値よりも高い場合に注目入力階調値を増加させることによって第１補正後階調値を求めるための増加用係数Ｐ1 と、注目入力階調値が前段入力階調値よりも低い場合に注目入力階調値を減少させることによって第１補正後階調値を求めるための減少用係数Ｐ2 とが含まれている場合を例示する。 The nonvolatile memory 261 stores first correction data, second correction data, and constant data (not shown).
The first correction data is a function and / or data table for calculating the first corrected gradation value based on the input gradation value of the target pixel and the input gradation value of the preceding pixel. In the following, an increase coefficient P for obtaining the first corrected gradation value by increasing the attention input gradation value when the attention input gradation value is higher than the previous stage input gradation value in the first correction data. 1 and a decrease coefficient P 2 for obtaining the first corrected gradation value by decreasing the attention input gradation value when the attention input gradation value is lower than the previous stage input gradation value. An example is given.
　第２補正データは、注目画素電極１４の映像駆動部２１からの遠近に応じて、第１補正後階調値に基づいて第２補正後階調値を演算するための関数及び／又はデータテーブル等である。以下では第２補正データに、行番号及び第１補正後階調値を独立変数として第２補正後階調値を求めるための関数ｆが含まれている場合を例示する。
　定数データは、定数Ｍ及び定数Ｎである。
　揮発性メモリ２６２は、演算部２６３の作業領域として用いられる。演算部２６３は、揮発性メモリ２６２に対して例えば各種変数を読み書きする。 The second correction data is a function and / or data table for calculating the second corrected gradation value based on the first corrected gradation value according to the perspective of the pixel electrode 14 of interest from the video driving unit 21. Etc. Hereinafter, a case where the function f for obtaining the second corrected gradation value using the row number and the first corrected gradation value as independent variables is included in the second correction data will be exemplified.
The constant data is a constant M and a constant N.
The volatile memory 262 is used as a work area for the calculation unit 263. The computing unit 263 reads / writes various variables from / to the volatile memory 262, for example.
　演算部２６３は、実施の形態１の制御部２３と同様にして、映像駆動部２１及び走査駆動部２２の動作を制御する。
　演算部２６３には、複数個の階調信号が順次入力される。演算部２６３は、入力された階調信号を次に説明するように補正してから映像駆動部２１へ順次出力する。 The calculation unit 263 controls the operations of the video drive unit 21 and the scan drive unit 22 in the same manner as the control unit 23 of the first embodiment.
A plurality of gradation signals are sequentially input to the calculation unit 263. The calculation unit 263 corrects the input gradation signal as described below, and then sequentially outputs it to the video drive unit 21.
　図１２は、表示装置２で実行される階調値補正処理の手順を示すフローチャートである。
　演算部２６３は、映像の表示を開始するか否かを判定し（Ｓ１１）、まだ映像を表示しない場合（Ｓ１１でＮＯ）、再びＳ１１の処理を実行する。
　映像の表示を開始する場合（Ｓ１１でＹＥＳ）、演算部２６３は、各種変数をリセットする（Ｓ１２）。具体的には、演算部２６３は、列をカウントするための変数ｍを“０”にリセットし、行番号ｎを“１”にリセットし、注目入力階調値ｇa 、前段入力階調値ｇb 、第１補正後階調値ｇ1 、及び第２補正後階調値ｇ2 を夫々“０”にリセットする。 FIG. 12 is a flowchart illustrating a procedure of gradation value correction processing executed in the display device 2.
The computing unit 263 determines whether or not to start displaying video (S11), and when the video is not yet displayed (NO in S11), the processing of S11 is executed again.
When the display of video is started (YES in S11), the calculation unit 263 resets various variables (S12). Specifically, the calculation unit 263 resets the variable m for counting the columns to “0”, resets the row number n to “1”, the attention input gradation value g a , the previous stage input gradation value, g b, resets the first post-correction gradation value g 1, and the second corrected tone value g 2 respectively to "0".
　次に、演算部２６３は、自身に階調信号が入力されたか否かを判定し（Ｓ１３）、まだ入力されていない場合（Ｓ１３でＮＯ）、再びＳ１３の処理を実行する。
　自身に階調信号が入力された場合（Ｓ１３でＹＥＳ）、演算部２６３は、入力された階調信号が示す階調値を、注目入力階調値ｇa に代入し（Ｓ１４）、第１補正処理（図１３参照）を実行する（Ｓ１５）。第１補正処理では、第１補正後階調値ｇ1 が求められる。
　第１補正処理の終了後、演算部２６３は、注目入力階調値ｇa の値を、前段入力階調値ｇb に代入する（Ｓ１６）。 Next, the calculation unit 263 determines whether or not a gradation signal has been input to itself (S13). If it has not been input yet (NO in S13), the processing of S13 is executed again.
If own tone signal is input (YES in S13), the arithmetic unit 263, the tone value indicated by the input gradation signal, assigns to the target input gradation value g a (S14), first Correction processing (see FIG. 13) is executed (S15). In the first correction process, the first corrected gradation value g 1 is obtained.
After the end of the first correction process, the calculation unit 263 substitutes the value of the target input tone value g a for the previous input tone value g b (S16).
　次いで、演算部２６３は、第２補正処理（図１４参照）を実行する（Ｓ１７）。第２補正処理では、第２補正後階調値ｇ2 が求められる。
　次に、演算部２６３は、第２補正後階調値ｇ2 を示す階調信号を映像駆動部２１へ出力する（Ｓ１８）。
　次いで、演算部２６３は、映像の表示を終了するか否かを判定し（Ｓ１９）、まだ映像の表示を終了しない場合（Ｓ１９でＮＯ）、演算部２６３は、処理をＳ１３へ戻す。映像の表示を終了する場合（Ｓ１９でＹＥＳ）、演算部２６３は、階調値補正処理を終了する。 Next, the computing unit 263 performs a second correction process (see FIG. 14) (S17). In the second correction process, the second corrected gradation value g 2 is obtained.
Next, the computing unit 263 outputs a gradation signal indicating the second corrected gradation value g 2 to the video driving unit 21 (S18).
Next, the calculation unit 263 determines whether or not to end the display of the video (S19). If the display of the video is not yet ended (NO in S19), the calculation unit 263 returns the process to S13. When the display of the video is to be ended (YES in S19), the calculation unit 263 ends the gradation value correction process.
　図１３は、第１補正処理手順の詳細を示すフローチャートである。
　演算部２６３は、注目入力階調値ｇa が前段入力階調値ｇb より大きいか否かを判定する（Ｓ３１）。
　ｇa ＞ｇb である場合（Ｓ３１でＹＥＳ）、演算部２６３は、不揮発性メモリ２６１から増加用係数Ｐ1 を読み出し（Ｓ３２）、次の式（１）に従って第１補正後階調値ｇ1 を算出する（Ｓ３３）。
　　ｇ1 ＝Ｐ1 ×ｇa …（１） FIG. 13 is a flowchart showing details of the first correction processing procedure.
The computing unit 263 determines whether or not the target input tone value g a is greater than the previous-stage input tone value g b (S31).
When g a > g b (YES in S31), the calculation unit 263 reads the increase coefficient P 1 from the nonvolatile memory 261 (S32), and the first corrected gradation value g according to the following equation (1): 1 is calculated (S33).
g 1 = P 1 × g a (1)
　ｇa ≦ｇb である場合（Ｓ３１でＮＯ）、演算部２６３は、注目入力階調値ｇa が前段入力階調値ｇb より小さいか否かを判定する（Ｓ３４）。
　ｇa ＜ｇb である場合（Ｓ３４でＹＥＳ）、演算部２６３は、不揮発性メモリ２６１から減少用係数Ｐ2 を読み出し（Ｓ３５）、次の式（２）に従って第１補正後階調値ｇ1 を算出する（Ｓ３６）。
　　ｇ1 ＝Ｐ2 ×ｇa …（２） When g a ≦ g b (NO in S31), the calculation unit 263 determines whether or not the target input tone value g a is smaller than the preceding input tone value g b (S34).
When g a <g b (YES in S34), the calculation unit 263 reads the reduction coefficient P 2 from the nonvolatile memory 261 (S35), and the first corrected gradation value g according to the following equation (2): 1 is calculated (S36).
g 1 = P 2 × g a (2)
　Ｓ３３又はＳ３６における演算部２６３は、式（１），（２）で求めた第１補正後階調値ｇ1 を“０”～“２５５”の整数に丸める処理も行なう。 The computing unit 263 in S33 or S36 also performs a process of rounding the first corrected gradation value g 1 obtained by the equations (1) and (2) to an integer of “0” to “255”.
　ｇa ＝ｇb である場合（Ｓ３４でＮＯ）、演算部２６３は、注目入力階調値ｇa を第１補正後階調値ｇ1 に代入する（Ｓ３７）。
　Ｓ３３、Ｓ３６、又はＳ３７の処理終了後、演算部２６３は第１補正処理を終了して、図１２に示す階調値補正処理へ戻る。
　なお、第１補正データはＬＵＴ２４２でもよい。この場合、第１補正処理における演算部２６３は、Ｓ３１～Ｓ３７の処理に替えて、ＬＵＴ２４２を参照し、注目入力階調値ｇa と前段入力階調値ｇb との組み合わせに関連付けられた第１補正後階調値ｇ1 を求める処理を行なう。 When g a = g b (NO in S34), the calculation unit 263 substitutes the target input tone value g a for the first corrected tone value g 1 (S37).
After the process of S33, S36, or S37 is completed, the calculation unit 263 ends the first correction process and returns to the gradation value correction process shown in FIG.
The first correction data may be the LUT 242. In this case, the calculation unit 263 in the first correction process refers to the LUT 242 instead of the processes of S31 to S37, and the first correction process associated with the combination of the target input tone value g a and the previous input tone value g b . A process of obtaining a corrected gradation value g 1 is performed.
　図１４は、第２補正処理手順の詳細を示すフローチャートである。
　演算部２６３は、不揮発性メモリ２６１から関数ｆを読み出す（Ｓ５１）。
　次いで、演算部２６３は、行番号ｎ及び第１補正後階調値ｇ1 を関数ｆに代入することによって、第２補正後階調値ｇ2 を算出する（Ｓ５２）。このとき、演算部２６３は、第２補正後階調値ｇ2 を“０”～“２５５”の整数に丸める処理も行なう。 FIG. 14 is a flowchart showing details of the second correction processing procedure.
The computing unit 263 reads the function f from the nonvolatile memory 261 (S51).
Next, the computing unit 263 calculates the second corrected gradation value g 2 by substituting the row number n and the first corrected gradation value g 1 into the function f (S52). At this time, the calculation unit 263 also performs a process of rounding the second corrected gradation value g 2 to an integer of “0” to “255”.
　Ｓ５２の終了後、演算部２６３は、変数ｍを“１”インクリメントし（Ｓ５３）、変数ｍが定数Ｍ以上であるか否かを判定する（Ｓ５４）。
　ｍ≧Ｍである場合（Ｓ５４でＹＥＳ）、演算部２６３は、行番号ｎが定数Ｎ以上であるか否かを判定する（Ｓ５５）。
　ｎ＜Ｎである場合（Ｓ５５でＮＯ）、演算部２６３は、行番号ｎを“１”インクリメントし（Ｓ５６）、変数ｍを“０”にリセットする（Ｓ５７）。
　ｎ≧Ｎである場合（Ｓ５５でＹＥＳ）、演算部２６３は、行番号ｎを“１”にリセットし（Ｓ５８）、処理をＳ５７に移す。 After the end of S52, the calculation unit 263 increments the variable m by “1” (S53), and determines whether the variable m is equal to or greater than the constant M (S54).
When m ≧ M (YES in S54), the calculation unit 263 determines whether or not the row number n is equal to or greater than a constant N (S55).
When n <N (NO in S55), the calculation unit 263 increments the row number n by “1” (S56), and resets the variable m to “0” (S57).
If n ≧ N (YES in S55), the calculation unit 263 resets the row number n to “1” (S58), and moves the process to S57.
　ｍ＜Ｍである場合（Ｓ５４でＮＯ）、又はＳ５７の処理終了後、演算部２６３は第２補正処理を終了して、図１２に示す階調値補正処理へ戻る。
　なお、第２補正データは係数テーブル２５３でもよい。この場合、第２補正処理における演算部２６３は、Ｓ５１の処理に替えて、行番号ｎを用いて係数テーブル２５３を参照し、補正係数を求める処理を行ない、Ｓ５２の処理に替えて、求めた補正係数と第１補正後階調値ｇ1 とを乗算し、乗算結果を“０”～“２５５”の整数に丸めることによって、第２補正後階調値ｇ2 を算出する処理を行なう。 When m <M (NO in S54) or after the process of S57 is completed, the arithmetic unit 263 ends the second correction process and returns to the gradation value correction process shown in FIG.
The second correction data may be a coefficient table 253. In this case, the calculation unit 263 in the second correction process refers to the coefficient table 253 using the line number n instead of the process of S51, performs a process of obtaining a correction coefficient, and obtains the process instead of the process of S52. A process of calculating the second corrected gradation value g 2 is performed by multiplying the correction coefficient by the first corrected gradation value g 1 and rounding the multiplication result to an integer of “0” to “255”.
　以上のような表示装置２は、実施の形態１の表示装置２と同様の作用効果を奏する。 The display device 2 as described above has the same operational effects as the display device 2 of the first embodiment.
　今回開示された実施の形態は、全ての点で例示であって、制限的なものではないと考えられるべきである。本発明の範囲は、上述した意味ではなく、請求の範囲と均等の意味及び請求の範囲内での全ての変更が含まれることが意図される。
　また、本発明の効果がある限りにおいて、表示装置２に、実施の形態１～３に開示されていない構成要素が含まれていてもよい。
　各実施の形態に開示されている構成要件（技術的特徴）はお互いに組み合わせ可能であり、組み合わせによって新しい技術的特徴を形成することができる。 The embodiment disclosed this time is to be considered as illustrative in all points and not restrictive. The scope of the present invention is not intended to include the above-described meaning, but is intended to include meanings equivalent to the scope of the claims and all modifications within the scope of the claims.
In addition, as long as the effect of the present invention is obtained, the display device 2 may include components that are not disclosed in the first to third embodiments.
The constituent elements (technical features) disclosed in each embodiment can be combined with each other, and a new technical feature can be formed by the combination.
　１１　　映像信号線
　１２　　走査信号線
　１４　　画素電極
　２　　　表示装置
　２１　　映像駆動部（映像入力部）
　２４　　第１補正部
　２５　　第２補正部  DESCRIPTION OF SYMBOLS 11 Video signal line 12 Scanning signal line 14 Pixel electrode 2 Display apparatus 21 Video drive part (video input part)
24 1st correction | amendment part 25 2nd correction | amendment part

Claims (5)

  1. 　複数の映像信号線と、
    　該映像信号線に接続されている複数の画素電極と、
    　前記複数の映像信号線の端部に接続されており、前記画素電極に与えられる映像信号を前記映像信号線に入力する映像入力部と
    　を備え、
    　前記画素電極に与えられた映像信号に応じた階調値を有する画素を含む映像を表示する表示装置において、
    　注目画素の階調値と、前記注目画素に対応する画素電極と隣り合い、該画素電極と同じ映像信号線から映像信号を与えられる画素電極に対応する前段画素の階調値とに基づいて、前記注目画素の階調値を補正する第１補正部、及び、
    　前記注目画素に対応する画素電極の前記映像入力部からの遠近に応じて、前記第１補正部による補正後の階調値を更に補正する第２補正部
    　を備え、
    　前記映像入力部は、前記第２補正部による補正後の階調値に応じた映像信号を前記映像信号線に入力するようにしてあることを特徴とする表示装置。     Multiple video signal lines;
    A plurality of pixel electrodes connected to the video signal line;
    A video input unit that is connected to ends of the plurality of video signal lines and that inputs video signals applied to the pixel electrodes to the video signal lines;
    In a display device for displaying an image including a pixel having a gradation value corresponding to a video signal applied to the pixel electrode,
    Based on the gradation value of the pixel of interest and the gradation value of the previous pixel adjacent to the pixel electrode corresponding to the pixel of interest and corresponding to the pixel electrode to which a video signal is applied from the same video signal line as the pixel electrode, A first correction unit for correcting a gradation value of the target pixel; and
    A second correction unit that further corrects the gradation value corrected by the first correction unit according to the distance from the video input unit of the pixel electrode corresponding to the target pixel;
    The display device according to claim 1, wherein the video input unit inputs a video signal corresponding to the gradation value corrected by the second correction unit to the video signal line.
  2. 　前記第１補正部は、
    　前記注目画素の階調値が前記前段画素の階調値よりも高い場合、補正後の階調値を前記注目画素の階調値よりも高く、
    　前記注目画素の階調値が前記前段画素の階調値よりも低い場合、補正後の階調値を前記注目画素の階調値よりも低く補正するようにしてあることを特徴とする請求項１に記載の表示装置。     The first correction unit includes:
    When the gradation value of the target pixel is higher than the gradation value of the preceding pixel, the corrected gradation value is higher than the gradation value of the target pixel;
    The corrected gradation value is corrected to be lower than the gradation value of the target pixel when the gradation value of the target pixel is lower than the gradation value of the preceding pixel. The display device according to 1.
  3. 　前記第２補正部は、前記第１補正部による補正後の階調値を、
    　前記注目画素に対応する画素電極が前記映像入力部から近いほど低く、
    　前記注目画素に対応する画素電極が前記映像入力部に遠いほど高く補正するようにしてあることを特徴とする請求項１又は２に記載の表示装置。     The second correction unit calculates the gradation value corrected by the first correction unit,
    The closer the pixel electrode corresponding to the pixel of interest is from the video input unit,
    The display device according to claim 1, wherein a pixel electrode corresponding to the target pixel is corrected to be higher as it is farther from the video input unit.
  4. 　前記第２補正部は、
    　前記注目画素に対応する画素電極が前記映像入力部に近い場合、補正後の階調値を前記第１補正部による補正後の階調値よりも低く、
    　前記注目画素に対応する画素電極が前記映像入力部から遠い場合、補正後の階調値を前記第１補正部による補正後の階調値よりも高く補正するようにしてあることを特徴とする請求項３に記載の表示装置。     The second correction unit includes
    When the pixel electrode corresponding to the target pixel is close to the video input unit, the gradation value after correction is lower than the gradation value after correction by the first correction unit,
    When the pixel electrode corresponding to the target pixel is far from the video input unit, the gradation value after correction is corrected to be higher than the gradation value after correction by the first correction unit. The display device according to claim 3.
  5. 　前記複数の映像信号線に交差するよう並置されており、順に走査信号が入力される複数の走査信号線を更に備え、
    　前記映像入力部は、前記走査信号線に走査信号が入力される場合に、前記画素電極に与えられる映像信号を前記映像信号線に入力するようにしてあり、
    　前記走査信号線に走査信号が入力される時点を基準にした前記映像信号線に映像信号が入力されるタイミングは、前記走査信号が入力される前記走査信号線の前記映像入力部からの遠近に応じて異なることを特徴とする請求項１乃至４の何れか一項に記載の表示装置。     A plurality of scanning signal lines which are juxtaposed so as to intersect the plurality of video signal lines and to which scanning signals are input in order;
    The video input unit is configured to input a video signal applied to the pixel electrode to the video signal line when a scanning signal is input to the scanning signal line.
    The timing at which the video signal is input to the video signal line based on the time point when the scanning signal is input to the scanning signal line is the distance from the video input unit of the scanning signal line to which the scanning signal is input. The display device according to claim 1, wherein the display device is different depending on the display device.
PCT/JP2015/064800 2015-05-22 2015-05-22 Display device WO2016189596A1 (en)

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JP2005140883A (en) * 2003-11-05 2005-06-02 Hitachi Ltd Display device
JP2008152176A (en) * 2006-12-20 2008-07-03 Sony Corp Display device drive circuit, display device, electronic equipment, display device driving method, and computer program
JP2008209890A (en) * 2007-01-29 2008-09-11 Hitachi Displays Ltd Display device
WO2012077620A1 (en) * 2010-12-10 2012-06-14 シャープ株式会社 Timing control circuit for display device, display device, and timing control method for display device
JP2012189765A (en) * 2011-03-10 2012-10-04 Panasonic Liquid Crystal Display Co Ltd Liquid crystal display device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005140883A (en) * 2003-11-05 2005-06-02 Hitachi Ltd Display device
JP2008152176A (en) * 2006-12-20 2008-07-03 Sony Corp Display device drive circuit, display device, electronic equipment, display device driving method, and computer program
JP2008209890A (en) * 2007-01-29 2008-09-11 Hitachi Displays Ltd Display device
WO2012077620A1 (en) * 2010-12-10 2012-06-14 シャープ株式会社 Timing control circuit for display device, display device, and timing control method for display device
JP2012189765A (en) * 2011-03-10 2012-10-04 Panasonic Liquid Crystal Display Co Ltd Liquid crystal display device

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