JP2008180934A - Liquid crystal device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal device capable of simplifying a circuit structure. <P>SOLUTION: The liquid crystal device includes a gamma correction circuit, a pulse width modulation circuit and an adjustment circuit. The gamma correction circuit corrects a gradation value of image data of respective colors among a plurality of colors which are input based on a gamma characteristic of either one color among the plurality of colors different from one another. The pulse width modulation circuit changes the image data of respective colors of the plurality of colors whose gradation values are corrected to pulse widths. The adjustment circuit adjusts a pulse width modulation output data of respective colors besides one color among pulse width modulation output data of the respective colors of the plurality of colors based on the gamma characteristic of the respective color beside one color. As the result, it becomes unnecessary to prepare a lookup table of the gamma characteristic at every color and, therefore, the capacity of a memory for storing the lookup table expressing the gamma characteristic can be reduced and the gamma correction circuit can be simplified. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid crystal device suitable for use in displaying various types of information.

  In a liquid crystal device that displays image data, a process for adjusting the display characteristics of the image data according to the characteristics of the display device is performed. As typical image processing, input image data is subjected to gradation characteristic processing (hereinafter referred to as “gamma correction”) according to the characteristics of the display device, and an image is displayed on the display device. The process to do is mentioned.

  Since a general liquid crystal device performs gamma correction on image data of each RGB color, a circuit for gamma correction is provided for each color of RGB.

  However, providing a circuit for gamma correction for each color of RGB in the liquid crystal device complicates the circuit structure of the liquid crystal device, leading to an increase in cost and a prolonged development period.

  In the technique described in Patent Document 1 below, all the source drivers are configured by digital circuits, thereby eliminating the need for amplifiers and gradation power supplies and reducing the number of components.

JP 2004-117598 A

  The present invention has been made in view of the above points, and an object thereof is to provide a liquid crystal device capable of simplifying the circuit structure.

  In one aspect of the present invention, the liquid crystal device corrects the gradation value of the image data of each of a plurality of input colors based on the gamma characteristics of any one of a plurality of different colors. A gamma correction circuit to perform, a pulse width conversion circuit to generate pulse width modulation output data of each color of a plurality of colors obtained by converting image data of each color of a plurality of colors subjected to the correction of the gradation value into a pulse width, and An adjustment circuit that adjusts pulse width modulation output data of each color other than the one color among the pulse width modulation output data of each color of the plurality of colors based on gamma characteristics of each color other than the one color; and Prepare.

  The liquid crystal device includes a gamma correction circuit, a pulse width modulation circuit, and an adjustment circuit. The gamma correction circuit corrects the gradation value of the image data of each of a plurality of input colors based on the gamma characteristics of any one of a plurality of different colors. The pulse width modulation circuit generates pulse width modulation output data of each color of a plurality of colors by converting the image data of each color of the plurality of colors subjected to the gradation value correction into a pulse width. The adjustment circuit adjusts the pulse width modulation output data of each color other than the one color among the pulse width modulation output data of each color of the plurality of colors based on the gamma characteristic of each color other than the one color. In this way, it is not necessary to have a gamma characteristic lookup table for each color, so that the memory capacity for storing the lookup table indicating the gamma characteristic can be reduced and the gamma correction circuit can be simplified. can do.

  In a preferred embodiment of the above liquid crystal device, the adjustment circuit obtains the number of pulses of pulse width modulation output data of a color other than the one color based on the gamma characteristics of each color other than the one color. The number of pulses is increased or decreased by a predetermined number of pulses. In this case, the adjustment circuit is, for example, an addition circuit or a subtraction circuit.

  In a preferred embodiment of the above-described liquid crystal device, the adjustment circuit obtains an output signal of pulse width modulation output data of a color other than the one color based on a gamma characteristic of each color other than the one color. Amplified or reduced by a predetermined value. In this case, the adjustment circuit is, for example, an offset circuit.

  In a preferred embodiment of the above-described liquid crystal device, the predetermined value is based on the tone value of the pulse width modulation output data of each color other than the one color, based on the gamma characteristic of each color other than the one color. It is set to match the tone value of the color other than the one color when it is corrected. As a result, an image that has been correctly gamma corrected can be displayed on the display screen.

  In another aspect of the present invention, an electronic apparatus including the above liquid crystal device in a display portion can be configured.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

[First embodiment]
First, a first embodiment of the present invention will be described. FIG. 1 is a block diagram illustrating a schematic configuration of a liquid crystal device 100 according to the first embodiment. The liquid crystal device 100 includes an image data output source 10, a gamma correction circuit 11, a pulse width modulation (PWM) circuit 12, an adder circuit 13, an output circuit 14, and a liquid crystal display panel 15. . The gamma correction circuit 11 includes a memory 16.

  The liquid crystal device 100 is, for example, a TFD (Thin Film Diode) type liquid crystal device. In the TFD type liquid crystal device 100, the liquid crystal display panel 15 includes a scanning electrode formed on one of two substrates facing each other, a signal electrode formed on the other substrate, and a liquid crystal layer formed between the two substrates. It is enclosed. An element having a nonlinear current-voltage characteristic is interposed between the liquid crystal layer and the scan electrode or between the liquid crystal layer and the signal electrode. The liquid crystal display panel 15 displays an image on the display screen by transmitting light to the liquid crystal layer with an illumination device or the like. A voltage is applied to the liquid crystal layer by supplying a pulse signal to each of the scanning electrode and the signal electrode. By applying a voltage to the liquid crystal layer, the orientation of the liquid crystal is changed, and the gradation of the displayed image is changed.

  The image data output source 10 includes a memory including a ROM (Read Only Memory) and a RAM (Random Access Memory), a storage unit including a magnetic recording disk, an optical recording disk, and the like, and a tuning circuit that tunes and outputs a digital image signal. The image data of a predetermined format is supplied to the gamma correction circuit 11 based on various clock signals generated by a timing generator (not shown).

  The gamma correction circuit 11 performs gamma correction on the RGB image data R1, G1, and B1 supplied from the image data output source 10. The memory 16 stores a lookup table (LUT) indicating gamma characteristics as a table of input gradation values and output gradation values. The gamma correction circuit 11 uses the gradation values of the respective colors obtained from the RGB image data R1, G1, and B1 as input gradation values, based on the LUT indicating the gamma characteristics stored in the memory 16, and An output gradation value corresponding to the gradation value is obtained. Then, the gamma correction circuit 11 supplies the obtained output gradation value of each color of RGB to the PWM circuit 12 as image data R2, G2, B2 of each color of RGB. The gamma correction circuit 11 will be described in detail later.

  The PWM circuit 12 performs pulse width modulation on the RGB image data R2, G2, and B2 subjected to gamma correction, and applies the pulse width modulated RGB color pulse output data R3, G3, and B3 to the adder circuit 13. Supply.

  The adder circuit 13 increases the pulse width modulation output data R3, G3, and B3 of each color of RGB, and outputs the pulse width modulation output data R4, G4, and B4 of each color of RGB with the increased number of pulses to the output circuit 14. The adder circuit 13 functions as an adjustment circuit in the present invention. The adding circuit 13 will be described in detail later.

  The output circuit 14 selects either the H level or the L level pulse signal based on the pulse width modulation output data R4, G4, and B4 of each color of RGB, and the selected pulse signal is displayed on the liquid crystal display panel 15. Output to the signal electrode. As a result, an image is displayed on the display screen of the liquid crystal display panel 15.

(Relationship between gamma correction circuit and addition circuit)
FIG. 2 is a graph showing the relationship between the voltage applied to the liquid crystal layer and the transmittance of the liquid crystal layer in each of the RGB pixels of the liquid crystal display panel 15. The graph 31R shows the relationship between the voltage applied to the liquid crystal layer and the transmittance of the liquid crystal layer in the R pixel, and the graph 31G shows the voltage applied to the liquid crystal layer and the transmission of the liquid crystal layer in the G pixel. The graph 31B shows the relationship between the voltage applied to the liquid crystal layer and the transmittance of the liquid crystal layer in the B pixel. The liquid crystal display panel 15 is a normally white liquid crystal display panel. Here, it is assumed that the voltage Vs is applied to the liquid crystal layer in each of the RGB pixels of the liquid crystal display panel 15. In this case, as shown in FIG. 2, even if the same voltage Vs is applied to the liquid crystal layer in each of the RGB pixels, the transmittance of each of the RGB pixels does not all become the same transmittance, and each has a different transmission. The rates are TR, TG, and TB.

  FIG. 3 is a graph showing the relationship between the input gradation value and the output gradation value in the liquid crystal display panel 15. The graph 32R is a graph showing the relationship between the input tone value and the output tone value for the R image, and the graph 32G is the graph showing the relationship between the input tone value and the output tone value for the G image. Yes, the graph 32B is a graph showing the relationship between the input tone value and the output tone value for the B image. As described above, the transmittance of each pixel of RGB does not become the same transmittance even when the same voltage Vs is applied to the liquid crystal layer of each pixel, and each has a different transmittance. Therefore, as shown in the graphs 32R, 32G, and 32B, even if the input gradation values of the RGB image data input to the liquid crystal display panel 15 are all the same, they are actually displayed on the liquid crystal display panel 15. The output tone value of the image is different for each color of RGB.

  Therefore, in a general liquid crystal device, an LUT indicating the gamma characteristics of each color of RGB is stored in a memory, and the gamma correction circuit uses an LUT indicating the gamma characteristics of each color of RGB for each image data of each color of RGB. Used to perform gamma correction. Specifically, the gamma correction circuit corrects the gradation value so that γ = output gradation value / input gradation value = 1. Therefore, at this time, the relationship between the input gradation value and the output gradation value of the gamma characteristic LUT indicating the R color is indicated by a point on the graph 33R, and the input gradation value of the GUT characteristic LUT indicating the G color is indicated. The relationship between the value and the output tone value is indicated by a point on the graph 33G, and the relationship between the input tone value and the output tone value of the LUT of the gamma characteristic indicating the B color is indicated by a point on the graph 33B. .

  In the liquid crystal device 100 according to the first embodiment, the memory 16 stores only the LUT indicating the gamma characteristic of one color among the RGB colors. For example, here, it is assumed that the memory 16 stores only the LUT indicating the gamma characteristic of the R color. At this time, the gamma correction circuit 11 corresponds to the input gradation value by using the LUT indicating the gamma characteristic of the R color using the gradation values of the RGB image data R1, G1, and B1 as input gradation values. The output gradation value to be obtained is obtained. Then, the gamma correction circuit 11 supplies the obtained output gradation value of each color of RGB to the PWM circuit 12 as image data R2, G2, B2 of each color of RGB.

  At this time, although the gradation value of the image data R2 of R color is gamma-corrected to the correct output gradation value, it is natural that the gradation values of the image data G2 and B2 of each color of GB are correct. The output tone value is not gamma corrected. For example, in FIG. 3, assuming that the gradation values of RGB image data R1, G1, and B1 are all Ki, when the gamma correction is performed to correct output gradation values, the RGB image data R2, G2, and B2 The tone values should be KoR, KoG, and KoB, respectively. However, in the liquid crystal device 100 according to the first embodiment, since the gamma correction circuit 11 uses only the LUT indicating the gamma characteristic of the R color, all the gradation values of the RGB image data R2, G2, and B2 are all. , KoR. Accordingly, the image data G2 and B2 for each color of GB have their tone values greatly deviated as compared to when the gamma correction is performed to correct output tone values. Here, it can be seen from FIG. 3 that KoR−KoG <KoR−KoB, so that the deviation of the gradation value of the B color is larger than the deviation of the gradation value of the G color.

  Therefore, in the liquid crystal device 100 according to the first embodiment, the addition circuit 13 is provided. The adder circuit 13 adjusts the number of pulses for the pulse width modulation output data G3 and B3 for each color of the GB among the input pulse width modulation output data R3, G3 and B3 for each color of RGB. Specifically, since the liquid crystal device 100 is a normally white liquid crystal device, the adder circuit 13 performs adjustment to increase a certain number of pulses for the pulse width modulation output data G3 and B3 of each color of GB, respectively. The adjusted pulse width modulation output data G3 and B3 of each color of GB are supplied to the output circuit 14 as pulse width modulation output data G4 and B4 of each color of GB. On the other hand, since the R-color pulse width modulation output data R3 is gamma-corrected to the correct output gradation value, the addition circuit 13 does not make any adjustments, and the R-color pulse width modulation output data R4 is left as it is. To the output circuit 14.

  Here, the increase amount of the pulse number when increasing to the pulse width modulation output data G3 of G color is defined as plg, and the increase amount of the pulse number when increasing to the pulse width modulation output data B3 of B color is plb. As a method of obtaining the increase amounts plg and plb, first, graphs 33R, 33G, and 33B indicating the gamma characteristics of the respective colors of RGB are obtained in advance based on the characteristics of the liquid crystal display panel 15 through experiments or the like. Next, the number of pulses that can be adjusted from the G color output gradation value obtained using the R color gamma characteristic to the G color output gradation value obtained using the G color gamma characteristic. Is determined as an increase amount plg. The number of pulses that can be adjusted from the output gradation value of B color obtained using the gamma characteristic of R color to the output gradation value of B color obtained using the gamma characteristic of B color And obtained as an increase amount plb. Therefore, the increase amounts plg and plb are predetermined values in the present invention.

  FIG. 4 is a graph showing the gamma characteristics of each of the RGB colors of the liquid crystal device 100 suitable for the first embodiment. In the graph shown in FIG. 4, for each input tone value, the output tone value of each color of GB obtained from the gamma characteristic graphs 34G and 34B of each color of GB and the graph 34R of the gamma characteristic of R color. The difference from the R output gradation value that is further obtained is always a constant difference ΔγRG, ΔγRB. Thus, when the differences ΔγRG and ΔγRB are constant, the increase amounts plg and plb can also be obtained as constant increase amounts.

  Here, since the deviation of the gradation value of the B color is larger than the deviation of the gradation value of the G color, in the normally white liquid crystal device 100, plg and plb are plb> plg. It becomes.

  As can be seen from the above, in the addition circuit 13, the increments plg and plb are the gradation values of the respective colors of GB corrected by the correction circuit 11 based on the gamma characteristics of the R color. It is set so as to match each color gradation value of the GB when it is corrected based on the gamma characteristic of each color. As a result, the liquid crystal device 100 can reduce the gradation value of each color of GB that has become larger than the correct output gradation value in the correction circuit 11, and displays a correctly gamma-corrected image on the display screen. Can be displayed.

  In the above-described example, the correction circuit 11 performs gamma correction on the gradation values of the RGB image data R1, G1, and B1 using the LUT that indicates the gamma characteristic of the R color. It is not limited. Instead of performing the gamma correction using the LUT indicating the gamma characteristic of the R color, the gamma correction may be performed using the LUT indicating the gamma characteristic of the G or B color.

  For example, when performing gamma correction using an LUT indicating the gamma characteristic of the B color, a subtracting circuit is provided in place of the adding circuit 13, and the subtracting circuit uses RG color pulse width modulation output data R3, For G3, adjustment is performed to reduce the number of fixed pulses. In this case, the amount of decrease in the number of pulses is assumed when the gradation value of each color of RG corrected based on the gamma characteristic of the B color in the correction circuit 11 is corrected based on the gamma characteristic of each color of RG. Is set to match the gradation value of each color of the RG. This also makes it possible to display a correctly gamma-corrected image on the display screen.

  As described above, the liquid crystal device of the present invention is a gamma that corrects the gradation value of image data of each input RGB color based on the gamma characteristics of any one of the RGB colors. A correction circuit; a PWM circuit that generates pulse width modulation output data of each color of RGB obtained by converting image data of each color of RGB subjected to gradation value correction into a pulse width; and pulse width modulation output data of each color of RGB An adjustment circuit that adjusts the pulse width modulation output data of each color other than the one color based on the gamma characteristic of each color other than the one color. By doing so, it is not necessary to have a gamma characteristic lookup table for each color of RGB, so the capacity of the memory for storing the LUT indicating the gamma characteristic can be reduced, and the gamma correction circuit is simplified. be able to.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. FIG. 5 is a block diagram showing a schematic configuration of the liquid crystal device 100 according to the second embodiment of the present invention. Unlike the liquid crystal device 100 according to the first embodiment, the liquid crystal device 100 according to the second embodiment includes an offset circuit 21 instead of the adder circuit 13. The offset circuit 21 functions as an adjustment circuit in the present invention.

  Regarding the second embodiment, in the example described in the first embodiment, that is, in the gamma correction circuit 11, the RGB color image data R 1, G 1, B 1 are represented by gradation values, and the R color gamma characteristic is represented by an LUT. An example of performing gamma correction will be described. In this case, as described above, although the gradation value of the image data R2 of R color is gamma-corrected to the correct output gradation value, the gradation values of the image data G2 and B2 of each color of GB are The correct output tone value is not gamma corrected.

  The PWM circuit 12 performs pulse width modulation on the RGB image data R2, G2, and B2 supplied from the gamma correction circuit 11, and outputs pulse width modulated output data R3, G3, and B3 on each color of RGB. This is supplied to the output circuit 14.

  The output circuit 14 selects a pulse signal of H level or L level based on the pulse width modulation output data R3, G3, B3 of each color of RGB, and selects the selected pulse signal for each color of RGB. The pulse signals R6, G6, and B6 are supplied to the offset circuit 21.

  The offset circuit 21 is composed of, for example, an amplifier circuit, amplifies the RGB color pulse signals R6, G6, and B6 supplied from the output circuit 14, and the amplified RGB color pulse signals R7, G7, and B7. And output to the signal electrode of the liquid crystal display panel 15. Specifically, since the gradation values of the image data G2 and B2 of each color of GB are not gamma-corrected to the correct output gradation values in the gamma correction circuit 11, the offset circuit 21 outputs the pulse signal of each color of GB. G6 and B6 are amplified at a constant magnification and output as pulse signals G7 and B7 for each color of GB. On the other hand, since the R color pulse signal R6 is gamma-corrected to the correct output gradation value, the offset circuit 21 outputs the pulse signal R7 as it is without amplification.

  Here, the magnification when amplifying the G-color pulse signal G6 is amg, and the magnification when amplifying the B-color pulse signal B6 is amb. As to how to determine the magnifications amg and amb, as in the first embodiment, first, based on the characteristics of the liquid crystal display panel 15, graphs 33R and 33G showing the gamma characteristics of each of the RGB colors shown in FIG. , 33B is obtained in advance. Next, a magnification capable of correcting the output tone value of the G color obtained using the gamma characteristic of the R color to the output tone value of the G color obtained using the gamma characteristic of the G color is set to a magnification that can be corrected. The magnification is amg. Further, a magnification capable of correcting the output tone value of the B color obtained using the gamma characteristic of the R color into the output tone value of the B color obtained using the gamma characteristic of the B color, Obtained as magnification amb. Accordingly, the magnifications amg and amb are predetermined values in the present invention.

  FIG. 6 is a graph showing the gamma characteristics of each of RGB colors of the liquid crystal device 100 suitable for the second embodiment. In the graph shown in FIG. 6, the output tone value obtained from the gamma characteristic graphs 35G and 35B for each color of GB is obtained from the R color gamma characteristic graph 35R for any input tone value. It is a constant multiple of the output gradation value.

  Specifically, for any input gradation value, the output gradation value obtained from the G color gamma characteristic graph 35G is the output gradation value obtained from the R color gamma characteristic graph 35R. It is mg times (mg: constant). Also, for any input gradation value, the output gradation value obtained from the B color gamma characteristic graph 35B is mb times the output gradation value obtained from the R color gamma characteristic graph 35R ( mb: constant). Thus, when mg and mb are always at a constant magnification, the magnifications amg and amb can also be obtained as constant magnification.

  Here, since the deviation of the gradation value of the B color is larger than the deviation of the gradation value of the G color, in the normally white liquid crystal device 100, the constant magnifications amg and amb are: amb> amg.

  As can be seen from the above description, in the offset circuit 21, the magnifications amg and amb represent the gradation values of the colors of GB corrected based on the gamma characteristics of the R color, and the gamma characteristics of the colors of GB, respectively. It is set to match the gradation value of each color of the GB when it is corrected based on the basis. As a result, the liquid crystal device 100 can reduce the gradation value of each color of GB, which has become larger than the correct output gradation value in the correction circuit 11, in the offset circuit 21, and has been correctly gamma corrected. Images can be displayed on the display screen.

  Also in the second embodiment, the correction circuit 11 performs gamma correction on the gradation values of the RGB image data R1, G1, and B1 using an LUT that indicates the R color gamma characteristics. It is not limited to this. It goes without saying that the gamma correction may be performed using the LUT indicating the gamma characteristic of the G or B color instead of performing the gamma correction using the LUT indicating the gamma characteristic of the R color.

  For example, when performing gamma correction using an LUT indicating the gamma characteristic of the B color, the offset circuit 21 performs adjustment to reduce the pulse signal for the RG color pulse signals R6 and G6. In this case, the magnification when the pulse signal is reduced is corrected based on the gradation value of each color of RG corrected by the correction circuit 11 based on the gamma characteristic of B color, and based on the gamma characteristic of each color of RG. It is set so as to match the gradation value of each color of RG when assumed. This also makes it possible to display a correctly gamma-corrected image on the display screen.

  As described above, even in the liquid crystal device according to the second embodiment, it is not necessary to have a gamma characteristic lookup table for each color of RGB, so the capacity of the memory for storing the LUT indicating the gamma characteristic is reduced. And the gamma correction circuit can be simplified.

[Application example]
In each of the above-described embodiments, the liquid crystal device includes a gamma correction circuit that corrects the gradation value of the input image data of each color of RGB based on the gamma characteristics of any one of the RGB colors. A PWM circuit that generates pulse width modulation output data of each color of RGB obtained by converting image data of each color of RGB subjected to gradation value correction into a pulse width, and pulse width modulation output data of each color of RGB, An adjustment circuit that adjusts the pulse width modulation output data of each color other than the one color based on the gamma characteristic of each color other than the one color. However, the image data is not limited to RGB colors.

  The liquid crystal device has two or more input colors based on the gamma characteristics of any one of a plurality of different colors of four or more colors obtained by adding a color such as C (cyan) to RGB. A gamma correction circuit that corrects the gradation value of the image data of each color of each color, and each color of the plurality of colors obtained by converting the image data of each color of the plurality of colors subjected to the gradation value correction into a pulse width A PWM circuit that generates the pulse width modulation output data, and pulse width modulation output data of each color other than the one color among the pulse width modulation output data of each color of the plurality of colors, each color other than the one color An adjustment circuit that adjusts based on the gamma characteristics of

[Electronics]
Next, specific examples of electronic devices to which the liquid crystal device 100 according to each of the embodiments described above can be applied will be described with reference to FIG.

  First, an example in which the liquid crystal device 100 according to each embodiment is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 7A is a perspective view showing the configuration of this personal computer. As shown in the figure, the personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal device 100 according to the present invention is applied.

  Next, an example in which the liquid crystal device 100 according to each embodiment is applied to a display unit of a mobile phone will be described. FIG. 7B is a perspective view showing the configuration of the mobile phone. As shown in the figure, a cellular phone 720 includes a plurality of operation buttons 721, a receiving port 722, a transmitting port 723, and a display unit 724 to which the liquid crystal device 100 according to the present invention is applied.

  Electronic devices to which the liquid crystal device 100 according to each embodiment can be applied include a liquid crystal television and a viewfinder in addition to the personal computer shown in FIG. 7A and the mobile phone shown in FIG. Type / monitor direct-view type video tape recorder, car navigation device, pager, electronic notebook, calculator, word processor, workstation, videophone, POS terminal, digital still camera, etc.

1 is a block diagram illustrating a schematic configuration of a liquid crystal device according to a first embodiment. It is a graph which shows the relationship between the voltage applied to a liquid-crystal layer, and the transmittance | permeability of the said liquid-crystal layer. It is a graph which shows the relationship between an input gradation value and an output gradation value. 3 is a graph showing gamma characteristics of a liquid crystal device suitable for the first embodiment. It is a block diagram which shows schematic structure of the liquid crystal device which concerns on 2nd Embodiment. It is a graph which shows the gamma characteristic of the liquid crystal device suitable for 2nd Embodiment. It is a figure which shows the example of the electronic device to which the liquid crystal device of each embodiment is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Image data output source, 11 Gamma correction circuit, 12 PWM circuit, 13 Adder circuit, 14 Output circuit, 15 Liquid crystal display panel, 100 Liquid crystal device

Claims (5)

A gamma correction circuit that corrects the gradation value of image data of each of a plurality of input colors based on the gamma characteristics of any one of a plurality of different colors;
A pulse width conversion circuit for generating pulse width modulation output data of each color of a plurality of colors obtained by converting the image data of each color of the plurality of colors subjected to the correction of the gradation value into a pulse width;
An adjustment circuit that adjusts pulse width modulation output data of a color other than the one color among the pulse width modulation output data of each color of the plurality of colors based on a gamma characteristic of each color other than the one color; and A liquid crystal device comprising:   The adjustment circuit increases or decreases the pulse number of the pulse width modulation output data of a color other than the one color by a predetermined number of pulses obtained based on the gamma characteristics of each color other than the one color. The liquid crystal device according to claim 1.   The adjustment circuit amplifies the output signal of the pulse width modulation output data of a color other than the one color by a predetermined value obtained based on the gamma characteristic of each color other than the one color. The liquid crystal device according to claim 1.   The predetermined value is other than the one color when the gradation value of the pulse width modulation output data of each color other than the one color is corrected based on the gamma characteristic of each color other than the one color. The liquid crystal device according to claim 2, wherein the liquid crystal device is set so as to match the gradation value of each color.   An electronic apparatus comprising the liquid crystal device according to any one of claims 1 to 4 in a display portion.

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