WO2015182181A1 - Dispositif d'affichage à cristaux liquides et procédé de traitement de données pour dispositif d'affichage à cristaux liquides - Google Patents

Dispositif d'affichage à cristaux liquides et procédé de traitement de données pour dispositif d'affichage à cristaux liquides Download PDF

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WO2015182181A1
WO2015182181A1 PCT/JP2015/055126 JP2015055126W WO2015182181A1 WO 2015182181 A1 WO2015182181 A1 WO 2015182181A1 JP 2015055126 W JP2015055126 W JP 2015055126W WO 2015182181 A1 WO2015182181 A1 WO 2015182181A1
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data value
liquid crystal
pixel
display device
crystal display
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PCT/JP2015/055126
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English (en)
Japanese (ja)
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張　小▲忙▼
正実 尾崎
浩和 奥野
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シャープ株式会社
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • 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 present invention relates to a liquid crystal display device and a data processing method in the liquid crystal display device, and more particularly to a technique of image processing applied to an input signal of the liquid crystal display device.
  • an active matrix type liquid crystal display device including a TFT (thin film transistor) as a switching element.
  • This liquid crystal display device includes a liquid crystal panel composed of two insulating substrates facing each other. On one substrate (TFT array substrate) of the liquid crystal panel, a gate bus line (scanning signal line) and a source bus line (video signal line) are arranged so as to intersect each other, A TFT is provided in the vicinity of the intersection.
  • the TFT includes a gate electrode connected to the gate bus line, a source electrode connected to the source bus line, and a drain electrode.
  • the drain electrode of the TFT is connected to pixel electrodes arranged in a matrix on the TFT array substrate in order to form an image.
  • the other substrate (counter substrate) of the liquid crystal panel is provided with a common electrode for applying a voltage to the pixel electrode through the liquid crystal.
  • a common electrode for applying a voltage to the pixel electrode through the liquid crystal.
  • the liquid crystal has a property of deteriorating when a DC voltage is continuously applied.
  • burn-in occurs, and the display quality is greatly lowered.
  • flicker has been an issue. Therefore, in order to prevent burn-in and suppress flicker, various inversion driving methods are employed in the liquid crystal display device.
  • a frame reversal method is employed in which the polarity of the liquid crystal applied voltage is reversed every frame period.
  • the frame inversion method if the polarity of the liquid crystal applied voltage in a certain frame is positive in an arbitrary pixel portion, the polarity of the liquid crystal applied voltage in the next frame is negative.
  • an inversion driving method for suppressing flicker for example, a source line inversion method for inverting the polarity of the liquid crystal applied voltage for each column is employed. When the source line inversion method is adopted, as shown in FIG.
  • the liquid crystal application voltage in the pixel portion in the adjacent column is positive.
  • the polarity of is negative.
  • a method is used that combines a method of reversing the polarity of the liquid crystal applied voltage temporally as in the frame inversion method and a method of spatially reversing the polarity of the liquid crystal applied voltage as in the source line inversion method. ing. Therefore, if the polarity of the liquid crystal applied voltage in each pixel portion in a certain frame is as shown in FIG. 31, the polarity of the liquid crystal applied voltage in each pixel portion in the next frame is as shown in FIG. It will be a thing.
  • an inversion driving method As an inversion driving method, as shown in FIG. 33, a gate line inversion method for inverting the polarity of the liquid crystal applied voltage for each row, and as shown in FIG. 34, a positive polarity and a negative polarity in both the vertical and horizontal directions. In some cases, a dot inversion method or the like for alternately generating the dots is employed. Further, regarding the source line inversion method and the gate line inversion method, there is a method for inverting the polarity of the liquid crystal applied voltage for each of a plurality of lines. By adopting the inversion driving method as described above, the liquid crystal is prevented from being deteriorated and flicker is suppressed.
  • killer patterns such as image patterns that cause flicker and image patterns that cause an increase in power consumption.
  • a killer pattern that causes flicker is a major cause of deterioration in display quality.
  • a killer pattern that causes an increase in power consumption causes a battery to be quickly consumed in a portable terminal device (mobile device) driven by the battery.
  • the existence of such a killer pattern is caused by the arrangement of pixels (pixel arrangement) and the inversion driving method. This will be described below.
  • a liquid crystal display device capable of 256 gradation display will be described as an example.
  • one pixel is composed of a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel.
  • R red
  • G green
  • B blue
  • pixel portion a portion constituting each of the sub-pixels.
  • Such pixel portions are arranged side by side in the vertical direction (the direction in which the source bus lines extend) and in the horizontal direction (the direction in which the gate bus lines extend) in the display portion as shown in FIG.
  • a pixel matrix is formed. In the configuration shown in FIG.
  • FIG. 37 is a diagram illustrating a configuration of a main part of the liquid crystal display device.
  • the display unit 91 includes a plurality of source bus lines SL, a plurality of gate bus lines GL, and intersections of the plurality of source bus lines SL and the plurality of gate bus lines GL.
  • a plurality of pixel portions 92 provided corresponding to each of the first and second pixel portions 92 are included.
  • FIG. 37 shows only components for 5 rows ⁇ 6 columns.
  • the liquid crystal display device is provided with a source driver 93 that drives a plurality of source bus lines SL and a gate driver 94 that drives a plurality of gate bus lines GL.
  • FIG. 38 is a diagram showing a maximum power consumption image pattern in a liquid crystal display device adopting a vertical stripe RGB sub-pixel configuration and a source line inversion method.
  • FIG. 38 shows the gradation value of each pixel unit 92 in a certain frame. In FIG. 38, focusing on the vertical direction, 255 and 0 are alternately arranged. When attention is paid to the horizontal direction in FIG. 38, all the gradation values are the same.
  • a source driver 93 that can output 8-bit data is used.
  • the maximum value is 255 and the minimum value is 0 with respect to the data value (gradation value) output from the source driver 93. From the above, when attention is paid to an arbitrary column in FIG. 38, it is understood that the maximum value of the gradation value and the minimum value of the gradation value are alternately arranged. Since the gate driver 94 sequentially selects a plurality of gate bus lines GL one by one, if the image pattern is as shown in FIG. 38, each time the gate bus line GL to be selected is switched (one horizontal). For each scanning period), the video signal voltage applied to the source bus line SL varies greatly. That is, if the image pattern is as shown in FIG. 38, the amplitude of the video signal voltage is maximized in all the columns, so that the power consumption is maximized. Note that even if 0 and 255 are interchanged in all the pixel portions 92 in FIG. 38, the power consumption is similarly maximized.
  • FIG. 39 is a diagram showing another example of the maximum power consumption image pattern in the liquid crystal display device adopting the vertical stripe RGB sub-pixel configuration and the source line inversion method.
  • 255 and 0 are alternately arranged in both the vertical direction and the horizontal direction. Therefore, focusing on an arbitrary column, the maximum value of the gradation value and the minimum value of the gradation value are alternately arranged as in FIG. Therefore, even when the image pattern is as shown in FIG. 39, the amplitude of the video signal voltage is maximized in all the columns, so that the power consumption is maximized.
  • the power consumption is similarly maximized.
  • FIG. 40 is a diagram showing a flicker image pattern in a liquid crystal display device adopting a vertical stripe RGB sub-pixel configuration and a frame inversion method.
  • FIG. 40 when attention is paid to the horizontal direction, 128 and 0 are alternately arranged. Further, when attention is paid to the vertical direction in FIG. 40, all gradation values are the same.
  • the frame inversion method the polarity of the liquid crystal applied voltage is inverted every frame. Therefore, even if the gradation value is the same in a plurality of consecutive frames, the liquid crystal responds for each frame.
  • an object of the present invention is to realize a liquid crystal display device that does not cause a significant increase in power consumption or flicker even if the image pattern is a specific pattern called a killer pattern.
  • a plurality of scanning signal lines, a plurality of video signal lines intersecting with the plurality of scanning signal lines, and intersections of the plurality of scanning signal lines and the plurality of video signal lines are respectively provided.
  • a liquid crystal display device that includes a liquid crystal panel including a plurality of pixel portions arranged in a matrix so as to correspond, and displays an image based on an input signal on the liquid crystal panel, Using the conversion pattern comprising P (P is an integer of 2 or more) coefficients corresponding to a plurality of rows ⁇ one column of pixel portions, or one row ⁇ multiple columns of pixel portions, or multiple rows ⁇ multiple columns of pixel portions.
  • a data value correction unit that generates a display image signal to be given to the liquid crystal panel by correcting the data value of the input signal for the pixel unit;
  • a video signal line driving unit that drives the plurality of video signal lines based on the display image signal;
  • a scanning signal line driving unit that drives the plurality of scanning signal lines, The sum of the values of P coefficients included in the conversion pattern is 1,
  • the data value correction portion has a one-to-one correspondence between the pixel portion included in the group and the coefficient included in the conversion pattern.
  • the group is constituted by the pixel portion of interest and (P-1) pixel portions that are determined according to the conversion pattern and display the same color as the pixel portion of interest, and are included in the group
  • the sum of the products of the data value of the input signal for each pixel portion and the coefficient value corresponding to each pixel portion is used as the data value of the display image signal for the pixel portion of interest.
  • the data value correcting unit corrects the data value of the input signal for the plurality of pixel units using only one type of conversion pattern.
  • the conversion pattern includes two coefficients corresponding to a pixel portion of 2 rows ⁇ 1 column.
  • the conversion pattern includes two coefficients corresponding to a pixel portion of 1 row ⁇ 2 columns.
  • the conversion pattern is obtained by multiplying a first pattern composed of two coefficients corresponding to a pixel portion of 2 rows ⁇ 1 column and a second pattern composed of two coefficients corresponding to a pixel portion of 1 row ⁇ 2 columns. It consists of four coefficients obtained by this.
  • the data value correction unit obtains a data value of the display image signal for the target pixel unit by a weighted average.
  • a coefficient value corresponding to the target pixel portion is larger than values of other coefficients.
  • the data value correction unit corrects data values of the input signal for the plurality of pixel units by sequentially using a plurality of types of conversion patterns.
  • the data value correction unit corrects the data value of the input signal for the plurality of pixel units using a conversion pattern selected based on a switching control signal from a plurality of types of conversion patterns prepared in advance. It is characterized by that.
  • An eleventh aspect of the present invention is the first or tenth aspect of the present invention, When processing for correcting the data value of the input signal for the plurality of pixel units is defined as data value correction processing, whether or not the data value correction processing is performed by the data value correction unit is switched based on a switching control signal It is characterized by being able to.
  • a degamma correction processing section for performing degamma correction processing on the input signal A gamma correction processing unit that performs gamma correction processing on the display image signal;
  • the data value correction unit may generate the display image signal by correcting a data value of an input signal that has been subjected to the degamma correction processing by the degamma correction processing unit.
  • a thirteenth aspect of the present invention is the twelfth aspect of the present invention.
  • processing for correcting the data value of the input signal for the plurality of pixel portions is defined as data value correction processing, the degamma correction processing, the data value correction processing by the data value correction portion, and the gamma correction processing
  • the presence or absence of execution of a series of processes is switched based on a switching control signal.
  • a fourteenth aspect of the present invention is a data processing method in a liquid crystal display device that displays an image based on an input signal on a liquid crystal panel including a plurality of pixel portions, An input signal receiving step for receiving the input signal; Using the conversion pattern comprising P (P is an integer of 2 or more) coefficients corresponding to a plurality of rows ⁇ one column of pixel portions, or one row ⁇ multiple columns of pixel portions, or multiple rows ⁇ multiple columns of pixel portions.
  • the sum of the values of P coefficients included in the conversion pattern is 1,
  • the data value correction step has a one-to-one correspondence between the pixel portion included in the group and the coefficient included in the conversion pattern.
  • the group is configured by the pixel portion of interest and (P-1) pixel portions that are determined according to the conversion pattern and display the same color as the pixel portion of interest, and are included in the group
  • the sum of the products of the data value of the input signal for each pixel unit and the value of the coefficient corresponding to each pixel unit is used as the data value of the display image signal for the pixel unit of interest.
  • a data value correction unit that generates a display image signal by correcting a data value of an input signal using a conversion pattern composed of P coefficients. For this reason, compared with the case where the data value of the input signal is not corrected, for example, the amplitude of the video signal voltage can be reduced and the luminance difference between adjacent pixels can be significantly reduced. As a result, power consumption can be reduced and flicker can be suppressed. From the above, even if the image pattern is a specific pattern called a killer pattern, a liquid crystal display device that does not cause inconveniences such as an increase in power consumption and occurrence of flicker is realized.
  • a liquid crystal display device having a relatively simple configuration and causing no inconvenience due to a specific killer pattern is realized.
  • the power consumption is more than conventional without affecting the visual effect generated from the display image. It becomes possible to reduce.
  • the occurrence of flicker is suppressed without affecting the visual effect generated from the display image. Is possible.
  • the liquid crystal display device adopting the vertical stripe RGB sub-pixel configuration, the source line inversion method, and the frame inversion method, it does not affect the visual effect generated from the display image.
  • the power consumption can be reduced and the occurrence of flicker can be suppressed.
  • the data values of the display image signals of the pixels in the group are all the same. Therefore, compared with the case where the data value of the input signal is not corrected, it is possible to significantly reduce power consumption and effectively suppress flicker.
  • the seventh aspect of the present invention when the data value of the input signal is corrected, the image before correction can be emphasized. This effectively suppresses the occurrence of a phenomenon called “color blur” and a phenomenon called “edge blur”.
  • the eighth aspect of the present invention when the data value of the input signal is corrected, the correction with an emphasis on the image before correction is reliably performed. Thereby, like the seventh aspect of the present invention, the occurrence of a phenomenon called “color blur” and a phenomenon called “edge blur” are effectively suppressed.
  • a plurality of types of conversion patterns are sequentially used when correcting data values. Thereby, it becomes possible to adapt to various killer patterns.
  • a plurality of types of conversion patterns are prepared in advance, and the conversion pattern used when correcting the data value is selected based on the switching control signal. For this reason, for example, the data value can be corrected in accordance with the specifications of the liquid crystal display device or the user's request.
  • the degamma correction process is performed on the input signal before the process of correcting the data value of the input signal is performed. For this reason, even if the input signal is non-linear data, a corrected data value is obtained appropriately.
  • the display image signal generated by the data value correction unit is subjected to gamma correction processing. Thereby, even when the liquid crystal panel has non-linear characteristics, image display is performed in consideration of the characteristics of the liquid crystal panel.
  • the same effect as that of the first aspect of the present invention can be achieved in the data processing method in the liquid crystal display device.
  • FIG. 1 is a block diagram illustrating a schematic configuration of a liquid crystal display device according to a first embodiment of the present invention.
  • FIG. 3 is a diagram illustrating a detailed configuration of a liquid crystal display device in the first embodiment.
  • it is an example of the conversion pattern aiming at prevention of the significant increase in power consumption.
  • it is a figure for demonstrating correction
  • it is a figure for demonstrating correction
  • FIG. 5 is a diagram illustrating data values of display image signals in each pixel unit when masking processing is performed using a flicker mask conversion pattern in the first embodiment. It is the figure which extracted 4 pixels worth of FIG.
  • the said 2nd Embodiment it is a figure which shows the data value of the image signal for a display in each pixel part when a masking process is performed using a flicker mask conversion pattern. It is the figure which extracted 4 pixels of FIG. It is a figure which shows an example of the comprehensive mask conversion pattern in the said 2nd Embodiment. In the said 2nd Embodiment, it is a figure which shows the data value of the image signal for a display in each pixel part when a masking process is performed using the comprehensive mask conversion pattern. It is a block diagram which shows the structure of the masking process part in the 3rd Embodiment of this invention.
  • FIG. 1 is a block diagram showing a schematic configuration of a liquid crystal display device according to a first embodiment of the present invention.
  • the liquid crystal display device includes a masking processing unit 100, a panel driving unit 200, and a liquid crystal panel 300.
  • the masking processing unit 100 performs a masking process to be described later on the input signal Din, and outputs a display image signal Dout obtained by the masking process.
  • the panel driving unit 200 gives a driving signal SD to the liquid crystal panel 300 based on the display image signal Dout output from the masking processing unit 100.
  • the liquid crystal panel 300 displays an image based on the drive signal SD.
  • the drive signal SD is composed of a scanning signal, which will be described later, and a driving video signal.
  • the inversion driving method a combination of the frame inversion method and the source line inversion method is adopted as the inversion driving method, and the vertical stripe RGB sub-pixel configuration (see FIG. 36) is adopted as the pixel configuration. It has been adopted.
  • the present invention can also be applied to a case where an inversion driving method different from that of the present embodiment is adopted or a case where a pixel configuration different from that of the present embodiment is adopted.
  • FIG. 2 is a diagram showing a detailed configuration of the liquid crystal display device.
  • the masking processing unit 100 is included in the timing controller 10.
  • the panel driving unit 200 includes a source driver 210 and a gate driver 220.
  • the display unit 310 in the liquid crystal panel 300 includes a plurality of source bus lines SL, a plurality of gate bus lines GL, and intersections of the plurality of source bus lines SL and the plurality of gate bus lines GL.
  • a plurality of corresponding pixel portions 312 are included.
  • the plurality of pixel portions 312 are arranged in a matrix to form a pixel array.
  • Each pixel unit 312 includes a TFT (thin film transistor) having a gate electrode connected to a gate bus line GL passing through a corresponding intersection and a source electrode connected to a source bus line SL passing through the intersection, and a drain of the TFT.
  • the timing controller 10 receives the input signal Din, and receives the display image signal Dout, the source control signal Sctl for controlling the operation of the source driver 210, and the gate control signal Gctl for controlling the operation of the gate driver 220. Output.
  • the source control signal Sctl includes a source start pulse signal, a source clock signal, and a latch strobe signal
  • the gate control signal Gctl includes a gate start pulse signal and a gate clock signal.
  • the source driver 210 receives the display image signal Dout and the source control signal Sctl (source start pulse signal, source clock signal, and latch strobe signal) sent from the timing controller 10 and supplies a video signal for driving to the source bus line SL. Apply. At this time, the source driver 210 sequentially holds the display image signal Dout indicating the voltage to be applied to each source bus line SL at the timing when the pulse of the source clock signal is generated. The held display image signal Dout is converted to an analog voltage at the timing when the pulse of the latch strobe signal is generated. The converted analog voltage is applied simultaneously to all the source bus lines SL as a driving video signal.
  • Sctl source start pulse signal, source clock signal, and latch strobe signal
  • the gate driver 220 Based on the gate control signal Gctl (gate start pulse signal and gate clock signal) sent from the timing controller 10, the gate driver 220 applies an active scanning signal to each gate bus line GL with a period of one vertical scanning period. repeat.
  • a scanning signal is applied to each gate bus line GL and a driving video signal is applied to each source bus line SL, whereby an image corresponding to the input signal Din is displayed on the display unit 310.
  • a data value correcting unit is realized by the masking processing unit 100
  • a video signal line driving unit is realized by the source driver 210
  • a scanning signal line driving unit is realized by the gate driver 220.
  • the input signal reception step is realized by the process in which the timing controller 10 receives the input signal Din
  • the data value correction step is realized by the masking process by the masking processing unit 100
  • the source driver 210 displays the display image.
  • a display image signal output step is realized by applying a driving video signal to the source bus line SL based on the signal Dout.
  • the masking process performed in the masking process part 100 is demonstrated.
  • processing for correcting the data value of the input signal Din to a value suitable for processing in the liquid crystal display device is performed. For example, even if the image pattern based on the input signal Din is the killer pattern described above, the data value of the input signal Din is corrected so as not to cause a significant increase in power consumption or the occurrence of flicker. At this time, the data value is corrected so that the appearance of the display image does not change before and after the correction.
  • a specific method of the masking process will be described.
  • the liquid crystal display device is prepared in advance with a conversion pattern defining a coefficient used when correcting the data value of the input signal Din.
  • a conversion pattern defining a coefficient used when correcting the data value of the input signal Din.
  • three examples of the conversion pattern will be described.
  • the masking process may be performed using a conversion pattern other than the three conversion patterns described below.
  • FIG. 3 is an example of a conversion pattern for the purpose of preventing a significant increase in power consumption.
  • this conversion pattern is referred to as a “power mask conversion pattern”.
  • the power mask conversion pattern is configured by two coefficients corresponding to the pixel portion 312 of 2 rows ⁇ 1 column. In the present embodiment, the values of the two coefficients are both “1 ⁇ 2”.
  • P is an integer of 2 or more
  • the value of each coefficient is determined so that the sum of the values of P coefficients is 1.
  • each pixel unit 312 in the display unit 310 is expressed in the form of PIX (x, y) as shown in FIG. 4, and how the data value of the input signal Din for each pixel unit 312 is corrected.
  • the corrected data value for the pixel portion PIX (1,1) in the first row and first column is the data value before correction for the pixel portion PIX (1,1) in the first row and first column and the second row. It is obtained based on the data value before correction for the pixel portion PIX (2, 1) in the first column.
  • the corrected data value for the pixel portion PIX (2,1) in the second row and first column is the data value before the correction for the pixel portion PIX (2,1) in the second row and first column, and the third row.
  • the corrected data value for the pixel portion PIX (1,2) in the first row and the second column is the data value before the correction for the pixel portion PIX (1,2) in the first row and the second column, and the second row. It is obtained based on the data value before correction for the pixel portion PIX (2, 2) in the second column.
  • the corrected data value for the pixel portion PIX (2,2) in the second row and second column is the data value before the correction for the pixel portion PIX (2,2) in the second row and second column and the third row. It is obtained based on the data value before correction for the pixel portion PIX (3, 2) in the second column.
  • the corrected data value for the pixel portion PIX (i, j) of the i-th row and j-th column (i and j are natural numbers) is the pixel portion PIX (i, j) of the i-th row and j-th column. ) For the pixel portion PIX (i + 1, j) in the (i + 1) -th row and j-th column.
  • the pixel part 312 which comprises a group, and the coefficient which comprises a conversion pattern are matched by 1 to 1.
  • the pixel portion PIX (i, j) in the i-th row and the j-th column is associated with the coefficient indicated by reference numeral 67 in FIG. 3, and the pixel portion PIX (i + 1, j in the (i + 1) th row and the j-th column. ) Is associated with the coefficient indicated by reference numeral 68 in FIG.
  • the data value of the input signal Din for the pixel portion PIX (i, j) in the i-th row and j-th column is D1
  • the input for the pixel portion PIX (i + 1, j) in the (i + 1) -th row and j-th column is D2
  • the coefficient indicated by reference numeral 67 in FIG. 3 is C1
  • the coefficient indicated by reference numeral 68 in FIG. 3 is C2
  • the corrected input signal data value (data value of the display image signal Dout) ) Is V, V is obtained by the following equation (1).
  • V D1 ⁇ C1 + D2 ⁇ C2 (1)
  • the data value of the pixel portion PIX (2, 2) in the second row and second column is 100, and the pixel portion PIX ( Assume that the data value of 3,2) is 20.
  • the coefficient indicated by reference numeral 67 in FIG. 3 corresponds to the pixel part PIX (2, 2) in the second row and second column
  • the coefficient indicated by reference numeral 68 in FIG. 3 is the pixel part PIX in the third row and second column. This corresponds to (3, 2).
  • the corrected input signal data value (data value of the display image signal Dout) for the pixel portion PIX (2, 2) in the second row and second column is 60 ( (See FIG. 7).
  • the data value of the display image signal Dout for all the pixel units 312 included in the display unit 310 is obtained by correcting the data value of the input signal Din using the power mask conversion pattern. It is done.
  • the data of the display image signal Dout in each pixel unit 312 is displayed.
  • the values are as shown in FIG.
  • the data value of the display image signal Dout in each pixel unit 312 is as shown in FIG.
  • the data value of all the pixel units 312 is 128.
  • the amplitude of the video signal voltage is remarkably reduced as compared with the case where the data value of the input signal Din is not corrected, so that power consumption is greatly reduced.
  • the appearance of the display image does not change before and after the correction of the data value of the input signal Din. This will be described below.
  • FIG. 9 is a diagram in which four pixels of FIG. 38 are extracted.
  • FIG. 10 is a diagram in which four pixels of FIG. 39 are extracted.
  • FIG. 11 is a diagram in which four pixels of FIG. 8 are extracted.
  • the data values in the first row are all 255, and the data values in the second row are all 0.
  • all data values are 128.
  • the data value of each pixel unit 312 is completely different between FIG. 9 and FIG. Therefore, if the human eye can distinguish individual pixels, the display image based on the image pattern shown in FIG. 9 is completely different from the display image based on the image pattern shown in FIG. It is visually recognized as an image.
  • the size of the pixels is so small that the human eye cannot distinguish between the individual pixels.
  • the human eye recognizes an image in units of a plurality of pixels. For this reason, the display image based on the image pattern shown in FIG. 9 looks the same as the display image based on the image pattern shown in FIG. Similarly, the display image based on the image pattern shown in FIG. 10 looks to the human eye in the same manner as the display image based on the image pattern shown in FIG.
  • the power consumption is reduced as compared with the conventional case without affecting the visual effect generated from the display image.
  • the data value correction processing is performed in an extremely small unit (every two subpixels) as compared with general image processing. Therefore, the occurrence of a phenomenon called “color blur” in which colors appear blurred and a phenomenon called “edge blur” in which outlines appear blurred are suppressed.
  • FIG. 12 is an example of a conversion pattern for the purpose of preventing the occurrence of flicker.
  • this conversion pattern is referred to as a “flicker mask conversion pattern”.
  • the flicker mask conversion pattern is composed of two coefficients corresponding to the pixel portion 312 of 1 row ⁇ 2 columns. In the present embodiment, the values of the two coefficients are both “1 ⁇ 2”.
  • the sub-pixels are arranged in the order of “red (R) sub-pixel, green (G) sub-pixel, blue (B) sub-pixel”. Are repeatedly arranged (see FIG. 36).
  • R red
  • G green
  • B blue
  • these coefficients are associated with pixel portions (sub-pixels) 312 that display the same color.
  • the pixel part PIX (i, j) of the i-th row and the j-th column form a group.
  • the pixel portion PIX (4,1) in the fourth row and first column form a group.
  • a group is formed by a thick frame pixel portion indicated by reference numeral 62 and a pixel portion PIX (4, 4) in the fourth row and fourth column (thick frame pixel portion indicated by reference numeral 63 in FIG. 5). Further, the two pixel units 312 included in the group are associated with the two coefficients constituting the flicker mask conversion pattern. Then, using the flicker mask conversion pattern, the data value of the display image signal Dout is obtained in the same manner as in the first example described above.
  • the data of the display image signal Dout in each pixel unit 312 is displayed.
  • the values are as shown in FIG. That is, the data value of all the pixel units 312 is 64. Accordingly, since the liquid crystal is driven in the same manner in all the pixel portions 312, the occurrence of flicker is suppressed. Further, the appearance of the display image does not change before and after the correction of the data value of the input signal Din. This will be described below.
  • FIG. 14 is a diagram in which four pixels of FIG. 40 are extracted.
  • FIG. 15 is a diagram in which four pixels of FIG. 13 are extracted.
  • the data values in the odd-numbered columns are all 128, and the data values in the even-numbered columns are all 0.
  • all data values are 64 in FIG.
  • the data value of each pixel unit 312 is completely different between FIG. 14 and FIG.
  • the human eye cannot distinguish individual pixels as described above, the display image based on the image pattern shown in FIG. 14 is different from the display image based on the image pattern shown in FIG. Looks the same.
  • the occurrence of flicker is suppressed without affecting the visual effect generated from the display image.
  • the data value correction process is performed in an extremely small unit (every two subpixels), the phenomenon called “color blur” and the phenomenon called “edge blur” are suppressed.
  • FIG. 16 is an example of a conversion pattern for the purpose of preventing a significant increase in power consumption and preventing the occurrence of flicker.
  • this conversion pattern is referred to as “total mask conversion pattern”.
  • the total mask conversion pattern is composed of four coefficients corresponding to the pixel portion 312 of 2 rows ⁇ 2 columns.
  • this total mask conversion pattern corresponds to a power mask conversion pattern (first pattern) composed of two coefficients corresponding to the pixel portion 312 of 2 rows ⁇ 1 column and a pixel portion 312 of 1 row ⁇ 2 columns. It is composed of four coefficients obtained by multiplying a flicker mask conversion pattern (second pattern) composed of two coefficients.
  • the values of the four coefficients are all “1/4”.
  • the pixel part PIX (i, j) of the i-th row and j-th column is calculated.
  • a group is formed by the pixel portion PIX (i + 1, j + 3). That is, a group is formed by four pixel portions 312 for displaying the same color.
  • the four pixel units 312 included in the group are associated with the four coefficients constituting the total mask conversion pattern.
  • the pixel portion PIX (i, j) in the i-th row and the j-th column is associated with the coefficient denoted by reference numeral 71 in FIG. 16
  • the pixel portion PIX (i + 1, j) in the (i + 1) -th row and the j-th column is 16
  • the pixel part PIX (i, j + 3) in the i-th row (j + 3) column is associated with the coefficient denoted by reference numeral 73 in FIG.
  • the display image signal Dout in each pixel unit 312 is displayed.
  • the data values are as shown in FIG.
  • the image pattern based on the input signal Din is the maximum power consumption image pattern as shown in FIG. 39
  • the data value of the display image signal Dout in each pixel unit 312 is as shown in FIG.
  • the image pattern based on the input signal Din is a flicker image pattern as shown in FIG. 40
  • the data value of the display image signal Dout in each pixel unit 312 is as shown in FIG.
  • the appearance of the display image does not change before and after the correction of the data value of the input signal Din.
  • the power consumption is reduced more than before and the occurrence of flicker is suppressed without affecting the visual effect generated from the display image.
  • the data value correction processing is performed in an extremely small unit (every four subpixels), the phenomenon called “color blur” and the phenomenon called “edge blur” are suppressed.
  • the method for obtaining the data value of the display image signal Dout when the conversion pattern includes P coefficients (P is an integer of 2 or more) is generalized.
  • the pixel unit 312 pixel unit that is to correct the data value of the input signal Din
  • the target pixel unit is defined as a “target pixel unit”.
  • the data value of the input signal Din for the kth pixel unit 312 is Dk
  • the kth pixel unit The value of the coefficient corresponding to 312 is Ck.
  • the data value V of the display image signal Dout for the target pixel portion is obtained by the following equation (2). That is, the sum of the products of the data value of the input signal Din for each pixel unit 312 included in the group and the coefficient value corresponding to each pixel unit 312 is the data of the display image signal Dout for the pixel unit of interest. Value.
  • the data value of the display image signal Dout for each pixel unit 312 in the display unit 310 is obtained by the above equation (2).
  • the liquid crystal display device is provided with the masking processing unit 100 that generates the display image signal Dout by correcting the data value of the input signal Din using a conversion pattern prepared in advance.
  • the power mask conversion pattern is used as the conversion pattern, the amplitude of the video signal voltage is significantly reduced as compared with the case where the data value of the input signal Din is not corrected, and the power consumption is greatly reduced.
  • the flicker mask conversion pattern is used as the conversion pattern, the luminance difference between adjacent pixels is remarkably reduced as compared with the case where the data value of the input signal Din is not corrected, and the occurrence of flicker is suppressed.
  • Second Embodiment> ⁇ 2.1 Overview>
  • the configuration (see FIGS. 1 and 2) and the inversion driving method of the liquid crystal display device in the present embodiment are the same as those in the first embodiment.
  • examples of three conversion patterns will be described with respect to the masking processing in the present embodiment.
  • FIG. 17 is a diagram illustrating an example of a power mask conversion pattern in the present embodiment.
  • This power mask conversion pattern is configured by two coefficients corresponding to the pixel portion 312 of 2 rows ⁇ 1 column.
  • the value of the coefficient in the first row is “2/3”
  • the value of the coefficient in the second row is “1/3”.
  • a group is formed by the above-described target pixel portion (the pixel portion 312 that is the target of calculation of the data value of the display image signal Dout) and the pixel portion in the next row of the target pixel portion.
  • the data value of the display image signal Dout is obtained in the same manner as in the first embodiment.
  • the two coefficient values may be values other than the above values.
  • the value of the coefficient corresponding to the target pixel portion is made larger than the values of the other coefficients.
  • the corrected data value for the target pixel portion is obtained by the weighted averaging process that places importance on the data value before correction for the target pixel portion.
  • the display image signal in each pixel unit 312 is displayed.
  • the data value of Dout is as shown in FIG.
  • the data value of the display image signal Dout in each pixel unit 312 is as shown in FIG.
  • the data value of all the pixel portions 312 in the odd-numbered rows is 170
  • the data value of all the pixel portions 312 in the even-numbered rows is 85.
  • the amplitude of the video signal voltage is reduced as compared with the case where the data value of the input signal Din is not corrected, and an increase in power consumption is suppressed.
  • FIG. 19 is a diagram in which four pixels of FIG. 18 are extracted. Since the human eye cannot distinguish individual pixels as described above, the display image based on the image pattern shown in FIG. 19 is similar to the display image based on the image pattern shown in FIG. Looks like. Further, as described above, the display image based on the image pattern shown in FIG. 9 (a diagram obtained by extracting four pixels in FIG. 38) or FIG. 10 (a diagram obtained by extracting four pixels in FIG. 39) is a human eye. Looks the same as the display image based on the image pattern shown in FIG. From the above, the appearance of the display image does not change before and after the correction of the data value of the input signal Din.
  • the power consumption is reduced as compared with the conventional case without affecting the visual effect generated from the display image.
  • the data value correction processing is performed in an extremely small unit (every two subpixels) as compared with general image processing.
  • one of the coefficients included in the power mask conversion pattern (the value of the coefficient associated with the pixel unit 312 that is the data value calculation target) is the other value. Is bigger than.
  • the original image (the image before the data value is corrected) is emphasized, and a phenomenon called “color blur” or a phenomenon called “edge blur” occurs. Generation is effectively suppressed.
  • FIG. 20 is a diagram illustrating an example of a flicker mask conversion pattern in the present embodiment.
  • This flicker mask conversion pattern is constituted by two coefficients corresponding to the pixel portion 312 of 1 row ⁇ 2 columns.
  • the value of the coefficient in the first column is “2/3”, and the value of the coefficient in the second column is “1/3”.
  • a group is formed by the above-described pixel portion of interest (the pixel portion 312 to which the data value of the display image signal Dout is calculated) and the pixel portion adjacent to the right of the three columns of the pixel portion of interest. Is done. That is, a group is formed by two adjacent sub-pixels for displaying the same color.
  • the data value of the display image signal Dout is obtained in the same manner as in the first embodiment.
  • the two coefficient values may be values other than the above values.
  • the value of the coefficient corresponding to the target pixel portion is made larger than the values of the other coefficients.
  • the corrected data value for the target pixel portion is obtained by the weighted averaging process that places importance on the data value before correction for the target pixel portion.
  • FIG. 22 is a diagram in which four pixels of FIG. 21 are extracted. Since the human eye cannot distinguish individual pixels as described above, the display image based on the image pattern shown in FIG. 22 is similar to the display image based on the image pattern shown in FIG. Looks like. Further, as described above, the display image based on the image pattern shown in FIG. 14 (the figure obtained by extracting four pixels in FIG. 40) is similar to the display image based on the image pattern shown in FIG. Looks like. From the above, the appearance of the display image does not change before and after the correction of the data value of the input signal Din.
  • the occurrence of flicker is suppressed without affecting the visual effect generated from the display image.
  • the data value correction processing is performed in an extremely small unit (every two subpixels) as compared with general image processing.
  • one of the coefficients included in the flicker mask conversion pattern (the value of the coefficient associated with the pixel unit 312 for which the data value is calculated) is the other value. Is bigger than.
  • the original image (the image before the data value is corrected) is emphasized, and a phenomenon called “color blur” or a phenomenon called “edge blur” occurs. Generation is effectively suppressed.
  • FIG. 23 is a diagram showing an example of a general mask conversion pattern in the present embodiment.
  • This total mask conversion pattern is composed of four coefficients corresponding to the pixel portion 312 of 2 rows ⁇ 2 columns.
  • the value of the upper left coefficient is “1/2”, and the values of the other coefficients are “1/6”.
  • Pixel part PIX (i, j) in the i-th row and the j-th column is the target pixel portion (the pixel portion 312 for which the data value of the display image signal Dout is calculated)
  • Pixel part PIX (i, j) Pixel part PIX (i, j + 3) of pixel part PIX (i + 1, j) and i line (j + 3) column of (i + 1) line and j column
  • a group is formed by the pixel portion PIX (i + 1, j + 3) in the (j + 3) column. That is, a group is formed by four adjacent sub-pixels for displaying the same color.
  • the pixel portion of interest PIX (i, j) is associated with the coefficient indicated by reference numeral 75 in FIG. 23, and the pixel portion PIX (i + 1, j) of the (i + 1) th row and jth column is shown in FIG.
  • the pixel portion PIX (i, j + 3) in the i-th row (j + 3) column is associated with the coefficient indicated by the symbol 77 in FIG. 23, and the (i + 1) -th row (j + 3) column.
  • the pixel portion PIX (i + 1, j + 3) of the eye is associated with a coefficient indicated by reference numeral 78 in FIG. Then, using this comprehensive mask conversion pattern, the data value of the display image signal Dout is obtained in the same manner as in the first embodiment.
  • the display image signal in each pixel unit 312 is displayed.
  • the data value of Dout is as shown in FIG.
  • the data value of the display image signal Dout in each pixel unit 312 is as shown in FIG.
  • the data value of all the pixel portions 312 is either 170 or 85.
  • the image pattern based on the input signal Din is a flicker image pattern as shown in FIG. 40
  • the data value of the display image signal Dout in each pixel unit 312 is as shown in FIG.
  • the luminance difference between adjacent pixels is reduced as compared with the case where the data value of the input signal Din is not corrected, and the occurrence of flicker is suppressed.
  • the appearance of the display image does not change before and after the correction of the data value of the input signal Din.
  • the power consumption is reduced more than before and the occurrence of flicker is suppressed without affecting the visual effect generated from the display image.
  • the data value correction processing is performed in an extremely small unit (every four subpixels) as compared with general image processing.
  • one of the four coefficients included in the total mask conversion pattern (the value of the coefficient associated with the pixel unit 312 for which the data value is calculated) is set. It is larger than the values of other coefficients.
  • the original image (the image before the data value is corrected) is emphasized, and a phenomenon called “color blur” or a phenomenon called “edge blur” occurs. Generation is effectively suppressed.
  • a liquid crystal display device that does not cause a significant increase in power consumption or flicker even if the image pattern is a specific pattern called a killer pattern is realized. Is done. In the masking process, the data value of the input signal Din is corrected so as to be closer to the image before correction compared to the first embodiment. This effectively suppresses the occurrence of a phenomenon called “color blur” and a phenomenon called “edge blur”.
  • FIG. 25 is a block diagram showing a configuration of the masking processing unit 100 in the present embodiment.
  • the masking processing unit 100 includes a first masking processing unit 101 and a second masking processing unit 102.
  • the first masking processing unit 101 generates intermediate data Dm by performing masking processing on the input signal Din using one of a plurality of conversion patterns prepared in advance.
  • the second masking processing unit 102 generates a display image signal Dout by performing masking processing on the intermediate data Dm using a conversion pattern different from the conversion pattern used by the first masking processing unit 101.
  • the display image signal Dout generated by the second masking processing unit 102 is given to the panel driving unit 200 (see FIG. 1).
  • the first masking processing unit 101 performs masking processing using the power mask conversion pattern
  • the second masking processing unit 102 performs masking processing using the flicker mask conversion pattern.
  • a display image signal Dout similar to that when the masking process is performed using the total mask conversion pattern is generated.
  • the first masking processing unit 101 and the second masking processing unit 102 can perform masking processing using conversion patterns other than the three conversion patterns described in the first embodiment.
  • the masking process is performed using one conversion pattern other than the three conversion patterns described in the first embodiment and any one of the power mask conversion pattern, the flicker mask conversion pattern, and the total mask conversion pattern. It may be done.
  • the masking process may be performed using two conversion patterns other than the three conversion patterns described in the first embodiment.
  • the present invention is not limited to this, and masking processing may be performed using three or more types of conversion patterns. .
  • FIG. 26 is a block diagram showing a schematic configuration of a liquid crystal display device according to the fourth embodiment of the present invention.
  • the masking processing unit 100 includes a first masking processing unit 111, a second masking processing unit 112, and a switching control unit 120.
  • the first masking processing unit 111 generates first internal data d1 by performing a masking process on the input signal Din using a certain type of conversion pattern.
  • the second masking processing unit 112 generates the second internal data d2 by performing masking processing on the input signal Din using a conversion pattern different from the conversion pattern used by the first masking processing unit 111.
  • the switching control unit 120 switches a signal supplied to the panel driving unit 200 as the display image signal Dout, for example, according to a switching control signal SW1 supplied from the outside.
  • the input signal Din is directly supplied to the panel driving unit 200 as the display image signal Dout.
  • the first internal data d1 generated by the first masking processing unit 111 is given to the panel driving unit 200 as the display image signal Dout.
  • the second internal data d2 generated by the second masking processing unit 112 is given to the panel driving unit 200 as the display image signal Dout.
  • the first masking processing unit 111 can perform masking processing using the power mask conversion pattern
  • the second masking processing unit 112 can perform masking processing using the flicker mask conversion pattern.
  • the switching control signal SW1 is given to the switching control unit 120 according to the specifications of the liquid crystal display device and the user's request.
  • the input control signal SW1 is supplied to the switching control unit 120 so that the point K and the point K2 are connected, thereby using the power mask conversion pattern to input the signal Din. It is possible to provide the panel driver 200 with the data subjected to the masking process.
  • ⁇ 4.2 Effects> two types of conversion patterns are prepared in advance, and the conversion pattern used for the masking process is appropriately selected. Further, the masking process can be prevented from being performed. As described above, a liquid crystal display device can be realized that can suppress a significant increase in power consumption and occurrence of flicker without unnecessarily correcting the data value of the input signal Din.
  • the relationship between the gradation level of the input signal to the liquid crystal panel 300 and the display luminance is described on the assumption that the liquid crystal panel 300 has linear characteristics. It was. However, in general, the liquid crystal panel 300 has nonlinear characteristics. Therefore, in the present embodiment, it is assumed that the liquid crystal panel 300 having nonlinear characteristics is employed.
  • the signal input to the liquid crystal display device is generally a signal that has been subjected to gamma correction processing. Therefore, in the present embodiment, it is assumed that an input signal Din that has been subjected to gamma correction processing is input to the liquid crystal display device.
  • FIG. 27 is a block diagram showing a schematic configuration of a liquid crystal display device according to the fifth embodiment of the present invention.
  • the liquid crystal display device according to the present embodiment is provided with a degamma correction processing unit 410 and a gamma correction processing unit 420 in addition to the components in the first embodiment (see FIG. 1). Yes.
  • the degamma correction processing unit 410 performs degamma correction processing on the input signal Din.
  • the input signal Din is converted from nonlinear RGB data to linear RGB data.
  • the masking processing unit 100 masking processing is performed in the same manner as in the above embodiments. Thereby, the display image signal Dout is generated.
  • the gamma correction processing unit 420 performs gamma correction processing on the display image signal Dout generated by the masking processing unit 100. Thereby, the display image signal Dout given to the panel drive unit 200 becomes nonlinear RGB data.
  • the gamma correction processing in the gamma correction processing unit 420 is performed according to the gamma characteristics of the liquid crystal panel 300.
  • a known technique can be used for the degamma correction process and the gamma correction process.
  • FIG. 28 is a block diagram showing a schematic configuration of a liquid crystal display device according to the sixth embodiment of the present invention.
  • the liquid crystal display device according to the present embodiment includes a first masking control unit 131 and a second masking control unit 132 in addition to the components in the fifth embodiment (see FIG. 27). Is provided.
  • the first masking control unit 131 switches whether to supply the input signal Din to the degamma correction processing unit 410 according to the switching control signal SW2.
  • the second masking control unit 132 switches a signal supplied to the panel drive unit 200 as the display image signal Dout according to the switching control signal SW2.
  • the switching control signal SW2 is at a high level, the point P1 and the point P2 are connected and the point Q and the point Q1 are connected. If the switching control signal SW2 is at a low level, the point P1 and the point P2 are connected. Assume that P2 is disconnected and point Q and point Q2 are connected.
  • the switching control signal SW2 is at a high level
  • the input signal Din is given to the degamma correction processing unit 410, and the degamma correction processing unit 410 performs degamma correction processing on the input signal Din.
  • the masking processing unit 100 masking processing is performed in the same manner as in the above embodiments.
  • the gamma correction processing unit 420 performs gamma correction processing on the display image signal Dout generated by the masking processing unit 100. Then, the display image signal Dout subjected to the gamma correction processing is given to the panel drive unit 200.
  • the switching control signal SW2 when the switching control signal SW2 is at the low level, the input signal Din is directly supplied to the panel drive unit 200 as the display image signal Dout. At this time, the degamma correction process, the masking process, and the gamma correction process are not performed.
  • FIG. 29 is a block diagram illustrating a configuration example of a liquid crystal display device when the masking processing unit 100 is provided in the source driver IC 500.
  • the liquid crystal display device includes a liquid crystal panel 300 including a display unit 310 and a gate driving unit 320, and a source driver IC 500 including a masking processing unit 100, a timing control unit 510, and a source driving unit 520. It is configured.
  • the display image signal Dout generated by the masking processing unit 100 is supplied to the source driving unit 520, and the source driving unit 520 drives the source bus line SL based on the display image signal Dout.
  • the present invention can also be applied to a liquid crystal display device having such a configuration.
  • the vertical stripe RGB sub-pixel configuration has been described as an example.
  • the present invention is not limited to this, and a pixel configuration other than the vertical stripe RGB sub-pixel configuration is also employed.
  • the present invention can be applied.
  • a pixel configuration in which the source bus line SL connected to the source electrode of the TFT in the pixel portion of each column is different between the odd and even rows this configuration is “Z inversion”.
  • the present invention can also be applied to the case where the above is adopted.
  • the type of liquid crystal display device and the presence / absence of the use of a backlight are not mentioned, but the masking process using the power mask conversion pattern is not necessary to provide a backlight or the like. This is particularly effective for a reflective liquid crystal display device that displays an image by utilizing reflection of light.
  • DESCRIPTION OF SYMBOLS 10 ... Timing controller 100 ... Masking process part 101, 111 ... 1st masking process part 102, 112 ... 2nd masking process part 120 ... Switching control part 131 ... 1st masking control part 132 ... 2nd masking control part 200 ... Panel driver 210 ... Source driver 220 ... Gate driver 300 ... Liquid crystal panel 310 ... Display unit 312 ... Pixel unit 410 ... De-gamma correction processing unit 420 ... Gamma correction processing unit GL ... Gate bus line SL ... Source bus line Din ... Input signal Dout ... Image signal for display

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Abstract

La présente invention concerne un dispositif d'affichage à cristaux liquides qui n'accroît pas significativement la consommation énergétique et qui ne génère pas de papillotement, même lorsqu'un motif d'image est un motif particulier appelé motif tueur. Un dispositif d'affichage à cristaux liquides selon l'invention est muni d'une unité (100) de masquage qui génère un signal d'image d'affichage (Dout) en utilisant un schéma de conversion qui comporte P coefficients pour corriger une valeur de données de signal d'entrée (Din). Lorsqu'une section de pixels qui est la cible de calcul pour une valeur de données de signal d'image d'affichage (Dout) est définie en tant que section de pixels d'intérêt, l'unité (100) de masquage crée un groupe qui est constitué par la section de pixels d'intérêt et P-1 sections de pixels qui sont déterminées en fonction du schéma de conversion, ledit groupe étant créé de telle façon qu'une correspondance biunivoque existe entre les sections de pixels comprises dans le groupe et les coefficients compris dans le schéma de conversion, et adopte la somme des produits de la valeur de données du signal d'entrée (Din) pour chacune des sections de pixels comprises dans le groupe et de la valeur du coefficient qui correspond à chaque section de pixels en tant que valeur de données de signal d'image d'affichage (Dout) pour la section de pixels d'intérêt.
PCT/JP2015/055126 2014-05-26 2015-02-24 Dispositif d'affichage à cristaux liquides et procédé de traitement de données pour dispositif d'affichage à cristaux liquides WO2015182181A1 (fr)

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Cited By (1)

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JP2019204019A (ja) * 2018-05-24 2019-11-28 シャープ株式会社 表示装置及びテレビ受信装置

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JP2004245975A (ja) * 2003-02-12 2004-09-02 Nec Corp Ｖｄｔ障害危険度情報発生装置および発生方法
JP2005027301A (ja) * 2003-06-30 2005-01-27 Texas Instr Inc <Ti> 対数変換を使用するビデオ補正システム及び方法
JP2006285238A (ja) * 2005-03-30 2006-10-19 Chi Mei Optoelectronics Corp 表示装置を用いる表示方法および表示装置
JP2007147692A (ja) * 2005-11-24 2007-06-14 Sony Corp 画像表示装置、画像表示方法、画像表示方法のプログラム及び画像表示方法のプログラムを記録した記録媒体

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JP2004245975A (ja) * 2003-02-12 2004-09-02 Nec Corp Ｖｄｔ障害危険度情報発生装置および発生方法
JP2005027301A (ja) * 2003-06-30 2005-01-27 Texas Instr Inc <Ti> 対数変換を使用するビデオ補正システム及び方法
JP2006285238A (ja) * 2005-03-30 2006-10-19 Chi Mei Optoelectronics Corp 表示装置を用いる表示方法および表示装置
JP2007147692A (ja) * 2005-11-24 2007-06-14 Sony Corp 画像表示装置、画像表示方法、画像表示方法のプログラム及び画像表示方法のプログラムを記録した記録媒体

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Publication number Priority date Publication date Assignee Title
JP2019204019A (ja) * 2018-05-24 2019-11-28 シャープ株式会社 表示装置及びテレビ受信装置
JP7082905B2 (ja) 2018-05-24 2022-06-09 シャープ株式会社 表示装置及びテレビ受信装置

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