JP2005326790A - Liquid crystal display, driving method used for the liquid crystal display, and electronic equipent equipped with the liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display, with which optimum visibility can be obtained by adjusting the luminance of the display screen by each of red, green, and blue according to the user's physical constitution, physical condition or the operating environment. <P>SOLUTION: An operation instruction signal c for changing gradation characteristics is sent out of an input device 21 to a control circuit 22 by an operation of a user M. A gradation data selection signal d is sent out of the control circuit 22 to a gradation data memory 23. Also, an image data transmission signal e is sent out of the control signal 22 to an image data memory 24. The gradation data g, corresponding to the gradation data selection signal d, is outputted from a gradation data memory 23. The image data memory 24 receives the image data transmission signal e and outputs image data f. While a gradation voltage generating circuit 25 receives the gradation data g, the circuit receives the image data f and outputs a drive signal h. A driver circuit 26 receives the drive signal h and sends out a red drive signal dr, a green drive signal dg, and blue drive signal db to a liquid crystal panel 27. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device, a driving method used in the liquid crystal display device, and an electronic apparatus including the liquid crystal display device. In particular, the visibility of a display screen depends on a user's constitution, physical condition, or usage environment. The present invention relates to a liquid crystal display device suitable for use in reducing the influence exerted, a driving method used for the liquid crystal display device, and an electronic apparatus including the liquid crystal display device.

  In a liquid crystal display device provided in a personal computer, a portable information terminal such as a mobile phone, and a car navigation system, screen display is performed based on preset gradation characteristics. In such a liquid crystal display device, since only one kind of gradation characteristic is set in advance, the visibility of the display screen depends on the color tone of the display image, the constitution and condition of the user, or ambient light. There is a problem that it changes and becomes difficult to see. For this reason, a liquid crystal display device that has improved such problems has been proposed.

Conventionally, as this type of technology, for example, there are those described in the following documents.
As shown in FIG. 10, the liquid crystal display device described in Patent Document 1 includes an input terminal 1, a gradation voltage circuit 2, a control IC 3, a gate driver IC 4, a source driver IC 5, and a liquid crystal panel 6. It is configured. In this liquid crystal display device, the gradation voltage circuit 2 sends a gradation correction reference voltage value b corresponding to the gradation selection signal a obtained from the input terminal 1 to the source driver IC 5. The control IC 3 performs timing control and controls the gate driver IC 4 and the source driver IC 5.

The gate driver IC 4 includes a shift register circuit, a buffer circuit, and the like, and drives a gate of a TFT (Thin Film Transistor) of the liquid crystal panel 6.
The source driver IC 5 includes a shift register circuit, a latch circuit, and the like, and a gradation correction reference voltage value output from the gradation voltage circuit 2 for display data having an arbitrary gradation sent from the control IC 3. A voltage is applied to each pixel of the liquid crystal panel 6 using b. Further, as shown in FIG. 11, the gradation voltage circuit 2 has a plurality of gradation characteristics 11, 12, 13, and 14, and based on the gradation selection signal a, the gradation selection circuit 15 A tone characteristic is selected. In this way, an optimum one is selected from a plurality of gradation characteristics, and a better screen display can be obtained.

  In the image display device described in Patent Document 2, one frame of an image to be displayed is stored in the image storage means. Further, the image read from the image storage means by the information reading means is displayed with a preset default value on the display means in accordance with the control of the CPU which has read the instruction of the externally connected pointing device. At this time, the hue of the default value corresponding to the specific image portion designated by the pointing device is adjusted to an arbitrary color by the color adjusting means while being checked on the screen, and the brightness of the default value is adjusted. While being checked on the screen, the gamma curve is adjusted by the brightness adjusting means so as to obtain an arbitrary brightness level. For this reason, compared with a trial and error method of adjusting a gamma curve while observing a change in an image, conversion adjustment is easy, and the operator's sensory burden is reduced.

In the display device described in Patent Document 3, the color temperature of external light is detected by a detection unit, and the video signal is corrected by a correction circuit according to the color temperature. The correction circuit performs white balance adjustment and gamma correction. When the deterioration rate of B among the optical elements of R, G, and B is faster than the deterioration rate of R and G, the emission intensity of B is suppressed when the color temperature of the external light is low, or the emission of R and G Increase strength. The corrected video signal is converted from digital to analog, and based on this, an image is displayed on the display panel. As a result, the degree of luminance degradation between R, G, and B is smoothed, the color tone shift is reduced, and the visibility of the display content is improved.
Japanese Patent Laid-Open No. 11-337909 (Abstract, FIGS. 1 and 3) JP 2003-122336 A (first page, FIG. 1) JP 2003-228330 A (Abstract, FIG. 1)

However, the conventional liquid crystal display device has the following problems.
That is, in the liquid crystal display device described in Patent Document 1, the gradation characteristics in a mixed color state are determined from a plurality of gradation characteristics, and therefore, fine gradation characteristics that are subdivided into the three primary colors cannot be adjusted. . For this reason, there is a problem that sufficient visibility cannot be obtained. In recent years, electronic devices such as notebook personal computers, mobile phones, digital cameras, car navigation systems and the like provided with this liquid crystal display device have become widespread and are being used in various environments by various users. Therefore, it is necessary to solve the above problems as soon as possible.

  Moreover, since the image display apparatus described in Patent Document 2 has a computer system configuration centered on a CPU, there is a problem that the scale of the apparatus increases. The image display apparatus is effective when the color and gamma characteristics are simply changed when designing on a workstation or the like, and is different from the present invention.

  In the display device described in Patent Document 3, the main purpose is to take measures against deterioration of the display panel, and this is effective in suppressing deterioration of visibility by taking measures against the deterioration. The gist is different.

  In order to solve the above problem, the invention described in claim 1 inputs a subpixel data signal corresponding to a subpixel obtained by dividing a pixel into three colors of red (R), green (G), and blue (B). A plurality of data signal lines; a plurality of scanning signal lines for inputting scanning signals; and a plurality of liquid crystal cells provided at intersections of the data signal lines and the scanning signal lines. A liquid crystal panel for displaying a color image corresponding to the sub-pixel data signal by supplying the sub-pixel data signal to the liquid crystal cell selected by the scanning signal, and for providing gradation to the sub-pixel data signal And a gradation adjusting unit that arbitrarily adjusts the gradation of the color image for each of the red, green, and blue colors. What is provided It is characterized.

  According to a second aspect of the present invention, there is provided the liquid crystal display device according to the first aspect, wherein gradation data storage means for storing a plurality of gradation characteristic data for each of the red, green, and blue colors is provided, and the gradation The adjusting means is configured to arbitrarily select the gradation characteristic data for each color stored in the gradation data storage means, and the gradation voltage generating circuit is configured to select the gradation for each selected color. The gradation voltage is generated for each color based on characteristic data.

  A third aspect of the present invention relates to the liquid crystal display device according to the second aspect, wherein the gradation adjusting means uses the gradation characteristic data for each color stored in the gradation data storage means as the liquid crystal display apparatus. It is characterized by being configured to be arbitrarily selected by the user.

  The invention according to claim 4 relates to the liquid crystal display device according to claim 2, and is provided with light detection means for detecting light around the liquid crystal display device and generating a light detection signal representing the frequency characteristics of the light. The gradation adjusting means is configured to select gradation characteristic data for each color stored in the gradation data storage means based on the frequency characteristic represented by the light detection signal. It is said.

  According to a fifth aspect of the present invention, there is provided the liquid crystal display device according to the second aspect, wherein an image signal representing a level for each of red, green and blue constituting the image by detecting an image around the liquid crystal display device. The gradation adjusting means selects the gradation characteristic data for each color stored in the gradation data storage means based on the level for each color represented by the image signal. It is characterized by being configured.

  According to a sixth aspect of the present invention, there is provided a driving method, wherein a plurality of data for inputting subpixel data signals corresponding to subpixels obtained by dividing a pixel into three colors of red (R), green (G), and blue (B) Signal lines, a plurality of scanning signal lines for inputting scanning signals, and a plurality of liquid crystal cells provided at intersections between the data signal lines and the scanning signal lines, A liquid crystal panel that displays a color image corresponding to the sub-pixel data signal by supplying the sub-pixel data signal to the liquid crystal cell selected by the scanning signal; and a plurality of gradations for providing gradation to the sub-pixel data signal It is used in a liquid crystal display device having a gradation voltage generation circuit for generating gradation voltages, and is characterized in that the gradation of the color image is arbitrarily adjusted for each of the red, green and blue colors.

  A seventh aspect of the present invention relates to an electronic apparatus, comprising the liquid crystal display device according to one of the first to fifth aspects.

  According to the configuration of the present invention, the gradation adjusting means for arbitrarily adjusting the gradation of the color image for each of the colors red, green, and blue is provided, so that it can be adapted to the user's constitution and physical condition and the surrounding environment. The optimum gradation characteristics are selected as intended by the user, and sufficient visibility can be ensured under any circumstances. Further, gradation data storage means for storing a plurality of gradation characteristic data for each of red (R), green (G), and blue (B) is provided, and gradation characteristic data is arbitrarily selected. The gradation of the image is arbitrarily adjusted for each color of red, green, and blue. For this reason, since the optimal gradation characteristic according to a user's constitution, physical condition, and surrounding environment is selected as intended by the user, sufficient visibility can be ensured under any circumstances. In addition, since light detection means for detecting light around an electronic device equipped with a liquid crystal display device and generating a light detection signal is provided, the gradation of the color image depends on the frequency characteristics of the light detection signal. Thus, it is possible to automatically change for each color of red, green, and blue, so that the deterioration of the visibility of the liquid crystal panel due to the influence of ambient light can be improved without the user's operation. In addition, since there is provided an imaging means for detecting an image around the electronic device equipped with the liquid crystal display device and generating an image signal, the gradation of the color image has each of the red, green and blue colors of the image signal. Since the color can be automatically changed for each color according to each level, the deterioration of the visibility of the liquid crystal panel 27 due to the influence of ambient light is improved without the user's operation.

  Provided is a liquid crystal display device having a configuration in which a user arbitrarily adjusts the gradation of a color image for each color of red, green, and blue, or adjusts based on a detection result of ambient light by an optical sensor or the like.

FIG. 1 is a block diagram showing an electrical configuration of a main part of an electronic apparatus provided with a liquid crystal display device according to a first embodiment of the present invention.
As shown in the figure, the electronic apparatus of this example is a mobile phone 20, and includes an input device 21, a control circuit 22, a gradation data memory 23, an image data memory 24, and a gradation voltage generation circuit 25. The driver circuit 26 and the liquid crystal panel 27 are included. The input device 21 is a button operation unit of the mobile phone 20, and changes gradation characteristics for each of red (R), green (G), and blue (B) of the liquid crystal panel 27 based on an arbitrary operation of the user M. Is sent to the control circuit 22. The control circuit 22 sends a gradation data selection signal d to the gradation data memory 23 based on the operation instruction signal c from the input device 21 and sends an image data transmission signal e to the image data memory 24.

  The gradation data memory 23 is composed of, for example, a ROM (read only memory) or the like, stores a plurality of gradation characteristic data for each of red (R), green (G), and blue (B), and a gradation data selection signal. The gradation data g selected by d is output. The image data memory 24 receives the image data transmission signal e from the control circuit 22 and sends the image data f for each of red (R), green (G), and blue (B) to the gradation voltage generation circuit 25. The gradation voltage generation circuit 25 receives the gradation data g from the gradation data memory 23, and also receives the image data f from the image data memory 24. Based on the gradation data g, the red (R), A gradation voltage is generated for each of green (G) and blue (B), and a drive signal h for driving the driver circuit 26 is output.

  The driver circuit 26 receives the drive signal h from the gradation voltage generation circuit 25 and sends the red drive signal dr, the green drive signal dg, and the blue drive signal db to the liquid crystal panel 27. In the liquid crystal panel 27, a liquid crystal material is sandwiched between two glass substrates arranged in parallel (not shown), and the alignment direction of liquid crystal molecules is controlled by a voltage applied to the liquid crystal material, so that the transmitted light is transmitted. The sub-pixel data signals (red drive signal dr, green drive signal dg, and green drive signal dg corresponding to the sub-pixels obtained by dividing the pixel into three colors of red (R), green (G), and blue (B). A plurality of data signal lines X1,..., Xn for inputting the blue drive signal db), a plurality of scanning signal lines Y1,..., Ym for inputting the scanning signal V, and the same scanning signal as the data signal lines X1,. A plurality of liquid crystal cells Zi, j (i = 1,..., N, j = 1,..., M) provided at intersections with the lines Y1,. The sub-pixel data signal is supplied to the liquid crystal cell selected by the scanning signal V. Displaying a color image corresponding to the same sub-pixel data signal by the.

FIG. 2 is a block diagram showing an electrical configuration of the gradation data memory 23 in FIG.
As shown in FIG. 2, the gradation data memory 23 includes a red gradation characteristic data area 31, a red gradation data selection circuit 32, a green gradation characteristic data area 33, and a green gradation. The data selection circuit 34 is composed of a blue gradation characteristic data area 35 and a blue gradation data selection circuit 36. The red gradation characteristic data area 31 stores data R1, R2, R3, R4 for setting the red gradation characteristic. The red gradation data selection circuit 32 is configured by a decoder or the like, and selects any one of the data R1, R2, R3, R4 based on the gradation data selection signal d, and selects the red gradation data. Outputs gr.

  The green gradation characteristic data area 33 stores data G1, G2, G3, and G4 for setting the green gradation characteristic. The green gradation data selection circuit 34 is composed of a decoder or the like, and selects any one of the data G1, G2, G3, and G4 based on the gradation data selection signal d to generate green gradation data. Output gg. The blue gradation characteristic data area 35 stores data B1, B2, B3, and B4 for setting the blue gradation characteristic. The blue gradation data selection circuit 36 is composed of a decoder or the like, and selects any one of the data B1, B2, B3, and B4 based on the gradation data selection signal d to select blue gradation data. gb is output.

FIG. 3 is a diagram showing logic for selecting data R1, R2, R3, R4, data G1, G2, G3, G4 and data B1, B2, B3, B4 based on the gradation data selection signal d. 4 is a diagram showing the red gradation characteristics stored in the red gradation characteristic data area 31 of the gradation data memory 23, and FIG. 5 is the green gradation characteristic data area 33 of the gradation data memory 23. FIG. 6 is a diagram showing the stored green tone characteristics, and FIG. 6 is a diagram showing the blue tone characteristics stored in the blue tone characteristics data area 35 of the tone data memory 23.
4, 5, and 6, the horizontal axis represents the relative gradation, and the vertical axis represents the relative luminance. The relative gradation includes the maximum gradation 1 that the image data can take and the minimum gradation. As for relative luminance, the maximum luminance that the liquid crystal panel 8 can take is 1, and the minimum luminance is 0.
The processing contents of the driving method used in the liquid crystal display device of this example will be described with reference to these drawings.
In this driving method, the gradation of the color image displayed on the liquid crystal panel 27 is adjusted for each color of red, green, and blue based on an arbitrary operation of the user M.

  That is, when the user M looks at the image displayed on the liquid crystal panel 27 and the display image is difficult to see, that is, when the visibility is poor, the user M changes the gradation characteristics of the screen with respect to the input device 21. Perform the operation. Then, the operation instruction signal c is sent from the input device 21 to the control circuit 22, and the gradation data selection signal d is sent from the control circuit 22 to the gradation data memory 23. For example, as shown in FIG. 3, the gradation data selection signal d is composed of a 6-bit bus including data buses DB5, DB4, DB3, DB2, DB1, and DB0, and when DB5 = 0 and DB4 = 0, The gradation characteristic data R1 is selected. When DB5 = 0 and DB4 = 1, red gradation characteristic data R2 is selected. When DB5 = 1 and DB4 = 0, red gradation characteristic data R3 is selected. When DB5 = 1 and DB4 = 1, red gradation characteristic data R4 is selected.

  Similarly, green gradation characteristic data G1, G2, G3, G4 are selected by the combination of DB3 and DB2, and blue gradation characteristic data B1, B2, B3 are selected by the combination of DB1 and DB0. B4 is selected. The gradation data g thus selected is output from the gradation data memory 23, and the gradation voltage generation circuit 6 adds gradation characteristics to the image data f and converts it into the drive signal h. As shown in FIG. 4, the red tone characteristics of any data R1, R2, R3, R4 increase in relative luminance as the relative tone increases. Each is different. Similarly, as shown in FIG. 5, the characteristics of the data G1, G2, G3, and G4 are different from each other in the green tone characteristics. Further, as shown in FIG. 6, the characteristics of the data B1, B2, B3, and B4 are different from each other in the blue tone characteristics. The gradation characteristics as described above are selected and the liquid crystal panel 27 is driven. If the user M sees the display image whose visibility has been changed by changing the gradation characteristics and determines that the visibility is still poor, the user M again performs an operation for changing the gradation characteristics on the input device 21.

  As described above, in the first embodiment, the gradation data memory 23 storing a plurality of gradation characteristic data for each of red (R), green (G), and blue (B) is provided. Since the gradation characteristic data is selected by the data selection signal d, the gradation of the color image is arbitrarily adjusted for each color of red, green, and blue. For this reason, since the optimum gradation characteristic according to the user's constitution and physical condition and the surrounding environment is selected as intended by the user, sufficient visibility is ensured under any circumstances.

FIG. 7 is a block diagram showing an electrical configuration of a main part of a mobile phone provided with a liquid crystal display device according to a second embodiment of the present invention, and is common to the elements in FIG. 1 showing the first embodiment. These elements are denoted by common reference numerals.
In the cellular phone 20A in this example, an optical sensor 40 and a control circuit 22A are provided instead of the input device 21 and the control circuit 22 in FIG. The optical sensor 40 detects light around the mobile phone 20A and generates a light detection signal P representing the frequency characteristics of the light. The control circuit 22A has a CPU (Central Processing Unit) 22a that controls the entire control circuit 22A and a ROM (Read Only Memory) 22b in which a selection control program for operating the CPU 22a is recorded. In particular, in this embodiment, the control circuit 22A selects the gradation characteristic data for each color stored in the gradation data memory 23 based on the frequency characteristic represented by the light detection signal P. The other configuration is the same as that shown in FIG.

FIG. 8 is a diagram showing the frequency characteristics of the light detection signal P output from the optical sensor 40. The vertical axis represents the level obtained by converting the level of the light detection signal P into a voltage, and the horizontal axis represents the wavelength of the light detection signal P. Has been taken.
The processing contents of the driving method used in the liquid crystal display device of this example will be described with reference to this figure.
In this driving method, the gradation of the color image displayed on the liquid crystal panel 27 is adjusted for each color of red, green, and blue based on the light detection signal P generated by the light sensor 40. That is, light around the mobile phone 20A is detected by the optical sensor 40, a light detection signal P representing the frequency characteristic of the light is generated and sent to the control circuit 22A, and the light detection signal P is sent from the control circuit 22A. The gradation data selection signal d set based on the frequency characteristic is sent to the gradation data memory 23. In this case, as shown in FIG. 8, since the wavelength of the light detection signal P is around 540 nm (green) and the level is the highest value, the luminance of the liquid crystal panel 27 near the green is lowered, for example, as shown in FIG. The internal data G4 is selected, and a gradation data selection signal d is sent from the control circuit 22A. Thereafter, the same processing as in the first embodiment is performed.

  As described above, in the second embodiment, the light sensor 40 that detects the light around the mobile phone 20A and generates the light detection signal P is provided. According to the frequency characteristics of the detection signal P, it is possible to automatically change for each color of red, green, and blue, so that the liquid crystal panel 27 can be visually recognized by the influence of ambient light without the user's operation. Sexual deterioration is improved.

FIG. 9 is a block diagram showing an electrical configuration of a main part of a mobile phone provided with a liquid crystal display device according to a third embodiment of the present invention.
In the cellular phone 20B of this example, a digital camera 50 and a control circuit 22B are provided instead of the input device 21 and the control circuit 22 in FIG. The digital camera 50 detects an image around the mobile phone 20B, and generates an image signal CV representing the level for each of the red, green, and blue colors constituting the image. The image signal CV is composed of red, green and blue component signals cr, cg and cb. The control circuit 22B selects the gradation characteristic data for each color stored in the gradation data memory 23 based on the levels of the component signals cr, cg, and cb. The other configuration is the same as that shown in FIG.

  In the driving method used in the liquid crystal display device of this example, the gradation of the color image displayed on the liquid crystal panel 27 is based on the image signal CV generated by the digital camera 50 for each color of red, green, and blue. Adjusted. That is, the digital camera 50 detects the peripheral image of the cellular phone 20B, and the red, green, and blue component signals cr, cg, and cb constituting the image are generated and sent to the control circuit 22B. A gradation data selection signal d set based on the levels of the component signals cr, cg, cb is sent from the gradation 22B to the gradation data memory 23. In this case, for example, if the level of the component signal cg is higher than the levels of the component signals cr and cb, for example, the data G4 in FIG. A gradation data selection signal d is sent from 22B. Thereafter, the same processing as in the first embodiment is performed.

  As described above, in the third embodiment, since the digital camera 50 for detecting the image around the mobile phone 20B and generating the image signal CV is provided, the gradation of the color image is red, green. , Blue component signals cr, cg, and cb can be automatically changed for each color of red, green, and blue according to the levels of the component signals cr, cg, and cb. The deterioration of the visibility of the liquid crystal panel 27 is improved.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiment, and even if there is a design change without departing from the gist of the present invention, Included in the invention.
For example, in the gradation data memory 23, four kinds of gradation data are set for each of red, green, and blue, but this number may be increased or decreased according to the purpose of use of the liquid crystal display device.
Further, the curves of the gradation characteristics shown in FIGS. 4, 5, and 6 may be other curves. Further, the electronic device provided with the liquid crystal display device is not limited to a mobile phone, and may be, for example, a notebook personal computer.

  The present invention can be applied to all electronic devices provided with a liquid crystal display device, and can be used to improve the poor visibility of a liquid crystal panel due to individual differences due to the user's constitution and physical condition or the influence of the surrounding environment. It can also be used effectively when the user has color blindness.

It is a block diagram which shows the electrical constitution of the principal part of the electronic device provided with the liquid crystal display device which is 1st Example of this invention. FIG. 2 is a block diagram showing an electrical configuration of a gradation data memory 23 in FIG. 1. It is a figure which shows the logic by which data R1, R2, R3, R4, data G1, G2, G3, G4 and data B1, B2, B3, B4 are selected based on the gradation data selection signal d. FIG. 6 is a diagram showing red gradation characteristics stored in a red gradation characteristic data area 31 of the gradation data memory 23; FIG. 6 is a diagram showing green gradation characteristics stored in a green gradation characteristic data area 33 of the gradation data memory 23; FIG. 4 is a diagram showing blue gradation characteristics stored in a blue gradation characteristic data area 35 of the gradation data memory 23; It is a block diagram which shows the electric constitution of the principal part of the mobile telephone provided with the liquid crystal display device which is 2nd Example of this invention. It is a figure which shows the frequency characteristic of the light reception signal P output from the optical sensor 40. FIG. It is a block diagram which shows the electrical constitution of the principal part of the mobile telephone provided with the liquid crystal display device which is the 3rd Example of this invention. It is a block diagram which shows the electric constitution of the conventional liquid crystal display device. It is a block diagram which shows the electrical constitution of the gradation voltage circuit 2 in FIG.

Explanation of symbols

20, 20A, 20B Mobile phone (electronic equipment)
21 Input device (part of gradation adjustment means)
22, 22A, 22B Control circuit (part of gradation adjustment means)
23 Gradation data memory (gradation data storage means)
24 Image data memory (part of liquid crystal display)
25 Gradation voltage generation circuit (part of liquid crystal display)
26 Driver circuit (part of liquid crystal display device)
27 Liquid crystal panel 31 Red gradation characteristic data area (part of gradation data storage means)
32 Red gradation data selection circuit (part of gradation data storage means)
33 Green gradation characteristic data area (part of gradation data storage means)
34 Green gradation data selection circuit (part of gradation data storage means)
35 Blue gradation characteristic data area (part of gradation data storage means)
36 Blue gradation data selection circuit (part of gradation data storage means)
40 Light sensor (light detection means)
50 Digital camera (imaging means)

Claims (7)

A plurality of data signal lines for inputting subpixel data signals corresponding to subpixels obtained by dividing a pixel into three colors of red (R), green (G), and blue (B), and a plurality of scanning signal lines for inputting scanning signals. , And a plurality of liquid crystal cells provided at intersections between the data signal lines and the scanning signal lines, and the sub-pixel data is stored in the liquid crystal cell selected by the scanning signal among these liquid crystal cells. A liquid crystal panel for displaying a color image corresponding to the sub-pixel data signal by supplying a signal;
A liquid crystal display device having a gradation voltage generation circuit for generating a plurality of gradation voltages for providing gradation to the sub-pixel data signal,
A liquid crystal display device, comprising: gradation adjusting means for arbitrarily adjusting the gradation of the color image for each of the red, green, and blue colors. Gradation data storage means for storing a plurality of gradation characteristic data for each of the red, green and blue colors is provided;
The gradation adjusting means includes
It is configured to arbitrarily select gradation characteristic data for each color stored in the gradation data storage means,
The gradation voltage generation circuit includes:
2. The liquid crystal display device according to claim 1, wherein the gradation voltage is generated for each color based on the selected gradation characteristic data for each color. The gradation adjusting means includes
3. The liquid crystal display device according to claim 2, wherein a user of the liquid crystal display device arbitrarily selects the gradation characteristic data for each color stored in the gradation data storage means. . Photodetection means for detecting light around the liquid crystal display device and generating a photodetection signal representing the frequency characteristics of the light is provided,
The gradation adjusting means includes
3. The liquid crystal according to claim 2, wherein the gradation characteristic data for each color stored in the gradation data storage means is selected based on the frequency characteristic represented by the light detection signal. Display device. Imaging means for detecting an image around the liquid crystal display device and generating an image signal representing a level for each color of red, green, and blue constituting the image is provided.
The gradation adjusting means includes
3. The configuration according to claim 2, wherein the gradation characteristic data for each color stored in the gradation data storage means is selected based on the level for each color represented by the image signal. Liquid crystal display device. A plurality of data signal lines for inputting subpixel data signals corresponding to subpixels obtained by dividing a pixel into three colors of red (R), green (G), and blue (B), and a plurality of scanning signal lines for inputting scanning signals. , And a plurality of liquid crystal cells provided at intersections between the data signal lines and the scanning signal lines, and the sub-pixel data is stored in the liquid crystal cell selected by the scanning signal among these liquid crystal cells. A liquid crystal panel for displaying a color image corresponding to the sub-pixel data signal by supplying a signal;
Used in a liquid crystal display device having a gradation voltage generation circuit for generating a plurality of gradation voltages for applying gradation to the sub-pixel data signal;
A driving method, wherein a gradation of the color image is arbitrarily adjusted for each of the red, green, and blue colors.   An electronic apparatus comprising the liquid crystal display device according to claim 1.

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