JP2006189680A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform video display with image quality and definition required by video information to be displayed according to the video information in a liquid crystal display device equipped with a liquid crystal display panel having a plurality of sub-pixels in respective unit pixels and capable of performing gray scale display. <P>SOLUTION: The liquid crystal display device is equipped with a voltage supply means for discretely supplying a voltage of a prescribed voltage value in addition to the gray scale voltage supplied from a source electrode to each of the plurality of the sub-pixels within the unit pixel. A controller 4 adjusts the voltage value supplied by the voltage supply means discretely by the each sub-pixel according to the video information entered in a video signal input section 1 by the judged results subjected the video information to discrimination etc., in the input signal discrimination section 2, and performs display control of the video information in the liquid crystal display panel 8. The liquid crystal display device is previously provided, as the voltage supply means, with, for example, auxiliary capacitor reference electrode to which the respective sub-pixels within the auxiliary capacitor unit pixel in the liquid crystal display panel 8 are separately connected, and the voltage values read out of a ROM 6 by an auxiliary capacitor signal generating circuit 7 are supplied by each of the respective sub-pixels from the respective auxiliary capacitor reference electrodes. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device including a liquid crystal display panel having a plurality of subpixels in each unit pixel.

  In a liquid crystal display device capable of gradation display, in order to widen the viewing angle, each pixel electrode is divided into a plurality of subpixel electrodes, and drive voltages applied to the pixel electrodes are applied to the subpixel electrodes at different ratios. For example, the pixel electrode is divided into a plurality of sub-pixels, and the thickness of the liquid crystal cell is varied for each sub-pixel within the same pixel electrode.

A gradation liquid crystal display panel has also been proposed that has symmetrical visual characteristics of upper, lower, and (left, right) and aims to widen the viewing angle without gradation inversion (for example, Patent Document 1). See). In the gradation liquid crystal display panel described in Patent Document 1, the pixel electrode is divided into sub-pixel electrodes, and a driving voltage is applied to these sub-pixel electrodes at different ratios. Further, for each sub-pixel electrode or within the sub-pixel electrode, The pretilt angle is changed or the rubbing direction is reversed.
JP-A-6-332009

  However, if a technique for applying a drive voltage at a different ratio to subpixel electrodes such as Patent Document 1 is employed and the voltage between subpixel electrodes is set to an extremely different value, the viewing angle characteristics of contrast On the other hand, since the difference in gradation between pixels becomes extremely large, a bright and dark pattern is visually recognized between sub-pixels, and it is difficult to provide a user with a sufficiently high image quality image. In particular, for still images that are frequently displayed as personal computer (PC) screens, the bright and dark patterns as described above are highlighted when the user views them, and fine characters and diagonal edges appear jagged. End up.

  In addition, when viewing the screen from the front at the same time as viewing the screen from the front, the color of the mixed color generated by the color mixture between the sub-pixels becomes unnatural. In particular, the hue of intermediate colors such as flesh color deviates from the target hue.

  The present invention has been made in view of the above-described circumstances, and in a liquid crystal display device including a liquid crystal display panel having a plurality of sub-pixels in each unit pixel and capable of gradation display, video information to be displayed is displayed. Accordingly, an object of the present invention is to enable video display with the required image quality and resolution for the video information.

The present invention is constituted by the following technical means in order to solve the above-described problems.
A first technical means includes a liquid crystal display panel having a plurality of unit pixels connected to a source electrode and a gate electrode, and having a plurality of subpixels in each unit pixel and capable of gradation display, and a display target. And a control unit that performs display control of video information on the liquid crystal display panel according to video information, wherein the source electrode is provided for each of a plurality of sub-pixels configured in the unit pixel. Voltage supply means for individually supplying a voltage having a predetermined voltage value in addition to the gradation voltage supplied from the control circuit, and the control means supplies the voltage value supplied by the voltage supply means in accordance with the video information. It is characterized by having an adjustment means for adjusting each pixel separately.

  According to a second technical means, in the first technical means, the voltage supply means has an auxiliary capacitance reference electrode to which each sub-pixel in the unit pixel is separately connected, and the voltage is supplied from each auxiliary capacitance reference electrode. A value is supplied for each sub-pixel.

  The third technical means comprises operation accepting means for accepting from the user a selection operation for selecting a display mode for the video information to be displayed in the first or second technical means, and the adjusting means The voltage value supplied by the voltage supply unit is adjusted individually for each sub-pixel according to the type of display mode selected by the reception unit.

  According to a fourth technical means, in the first or second technical means, there is provided an operation accepting means for accepting a selection operation for selecting video information to be displayed from a user, and the adjusting means is the operation accepting means. According to the type of the selected video information, the voltage value supplied by the voltage supply means is adjusted individually for each sub-pixel.

  A fifth technical means includes a source switching means for switching an input source of the video information to be displayed in the first or second technical means, and the adjustment means is selected by switching at the source switching means. According to the type of input source, the voltage value supplied by the voltage supply means is adjusted for each sub-pixel individually.

  According to a sixth technical means, in any one of the third to fifth technical means, the type is an image type indicating whether the video information to be displayed is a still image or a moving image. It is a thing.

  A seventh technical means is any one of the third to fifth technical means, wherein the type is a signal type indicating whether the video information to be displayed is a television signal or an RGB signal. It is what.

  According to the present invention, in a liquid crystal display device including a liquid crystal display panel having a plurality of sub-pixels in each unit pixel and capable of gradation display, the video information to be displayed is selected based on a user operation. Accordingly, the video can be displayed with the image quality and resolution required for the video information.

  The liquid crystal display device according to the present invention includes a liquid crystal display panel capable of displaying the next gradation, voltage supply means, and control means. This liquid crystal display panel has a plurality of unit pixels connected to the source electrode and the gate electrode, and has a plurality of sub-pixels in each unit pixel. The control means controls display of the video information on the liquid crystal display panel according to the video information to be displayed on the liquid crystal display panel.

  The voltage supply means individually supplies a voltage having a predetermined voltage value to each of the plurality of subpixels configured in the unit pixel. Therefore, in addition to the voltage supplied from the gate electrode and the gradation voltage supplied from the source electrode, a voltage supplied to each subpixel by this voltage supply means is applied to the liquid crystal display panel. This voltage may be applied to the auxiliary capacitance provided in each sub-pixel, and therefore this voltage supply means can be said to be auxiliary voltage supply means. And the control means in this invention has an adjustment means which adjusts the voltage value supplied by a voltage supply means for each subpixel according to video information.

  FIG. 1 is a block diagram showing a configuration example of a liquid crystal display device according to an embodiment of the present invention. In the figure, 1 is a video signal input unit, 2 is an input signal determination unit, and 3 is a microcomputer (hereinafter referred to as a microcomputer). 4) a controller, 5 a source driver (source driving circuit), 6 a ROM, 7 an auxiliary capacitance signal generating circuit, 8 a liquid crystal display panel, and 9 a gate driver (gate driving circuit).

Also, FIG. 2 is a diagram showing an example of an equivalent circuit of the liquid crystal display panel in the liquid crystal display device of FIG. 1, in the drawing, P unit pixel, P _A sub-pixel A, P _B sub-pixel B, S ₁ , _{S 2} denotes a source electrode, G ₁ denotes a gate electrode, _{H a} is an auxiliary capacitor reference electrode for the sub-pixel a, _{H B} is an auxiliary capacitor reference electrode for the sub-pixel B, the liquid crystal layer of _{L a} sub-pixel a, _{L B} is the liquid crystal layer of the subpixel B, the _{T a} sub-pixel a TFT, _{T B} is the sub-pixel B TFT, an auxiliary capacitor of _{C a} sub-pixel a, _{C B} is the auxiliary capacitor of the sub-pixel B.

  The liquid crystal display device illustrated in FIG. 1 includes an input signal determination unit 2, a microcomputer 3, a controller 4, a source driver 5, and a gate driver as an example of the above-described control means in addition to the video signal input unit 1 and the liquid crystal display panel 8. 9 includes an ROM 6 and an auxiliary capacitance signal generation circuit 7 as an example of the voltage supply means described above.

  The video signal input unit 1 inputs a video signal of a moving image or a still image to be displayed by an instruction operation or default setting by a user, and outputs the video signal to the input signal determination unit 2 and the controller 4. The input signal determination unit 2 determines the type of the image signal input by the video signal input unit 1 and transmits the determination result to the microcomputer 3. The discrimination executed here is, for example, discrimination based on motion / still image motion detection or video information format, or discrimination of RGB signals / television signals (or whether they are high-definition television signals, etc.). By this determination, a voltage value applied to an auxiliary capacitor described later is determined.

  The microcomputer 3 issues a command to the controller 4 based on the determination result from the input signal determination unit 2 to control the controller 4. The controller 4 controls the storage capacitor signal generation circuit 7 in addition to the control of the source driver 5 and the gate driver 9, thereby inputting video information to be displayed on the liquid crystal display panel 8, that is, input by the video signal input unit 1. The display control of the liquid crystal display panel 8 is performed according to the result of determining the input video signal by the input signal determination unit 2.

  The controller 4 includes, for example, a drive voltage generation unit, a drive signal generation unit, and an LUT (Look Up Table) (not shown). The drive voltage generation unit generates a drive voltage value to be applied to the source electrode of the liquid crystal display panel 8 and sends the voltage value to the source driver 5. The LUT is a conversion table for converting image data, which is display data, so as to ensure gradation characteristics at a wide viewing angle when displaying image data on the liquid crystal display panel 8. That is, the LUT receives the same data as the image data input to the drive signal generation unit, and transmits the result referred to in the conversion table based on the input image data to the drive signal generation unit. .

  The drive signal generation unit includes a pixel data conversion unit, a horizontal synchronization signal generation unit, and a vertical synchronization signal generation unit (not shown). The pixel data conversion unit converts the input image data based on the LUT reference result, and sends it to the source driver 5 as source drive image data. The horizontal sync signal generator generates horizontal source driving sources such as a source clock for controlling data capture from the input image data, a source start pulse for indicating the start of data, and a latch pulse for controlling switching of the source output. A synchronization signal is generated, and the generated signal (control signal for driving the source) is sent to the source driver 5. In addition, the vertical synchronization signal generator generates a gate drive vertical synchronization signal such as a gate clock indicating the shift timing of the gate bus line to be applied and a gate start pulse indicating the start of frame switching from the input image data. The generated signal (gate drive control signal) is sent to the gate driver 9. As described above, the drive signal generation unit generates a drive signal for operating the source driver 5 and the gate driver 9 based on the video information (image data) input by the video signal input unit 1 and the LUT reference result. And output to each. In the present invention, due to the presence of display control (and gradation characteristic correction control described later) based on the video information according to the present invention, at least the input image data is directly used as a value for each sub-pixel in the drive signal generation unit. Therefore, the data conversion in the LUT may not be executed, that is, the LUT may not be provided. In addition, when performing data conversion in the LUT, it is necessary to perform display control based on video information according to the present invention (and gradation characteristic correction control described later).

  The source driver 5 is a source arranged vertically to the liquid crystal display panel 8 to drive the liquid crystal display panel 8 based on the signal from the drive signal generation unit and the drive voltage value generated by the drive voltage generation unit. It is a circuit that applies a voltage having a voltage value sent from the drive signal generator to the bus line.

  The gate driver 9 applies an active matrix driving voltage to a gate bus line arranged horizontally on the liquid crystal display panel 8 in order to drive the liquid crystal display panel 8 based on a signal from the drive signal generation unit. Circuit. That is, a voltage is selectively applied to the gate bus line based on a signal from the drive signal generation unit.

The liquid crystal display panel 8 is an active matrix type display panel in which a plurality of unit pixels are arranged in a matrix, and a source bus line (source electrode) and a gate bus line (gate electrode) by a source driver 5 and a gate driver 9. Is operated by applying a voltage to the display, and an image based on the input image information is displayed. That is, the liquid crystal display panel 8 includes a source electrode S (S ₁ , S ₂ ,...) And a gate electrode G (G ₁ , G ₂ (not shown),. ..) and a plurality of unit pixels P connected to each other. The liquid crystal display panel 8 according to the present invention has a plurality of sub-pixels H (illustrated by two sub-pixels P _A and P _B in each unit pixel P).

Sub-pixel _{P A} is the liquid crystal layer _{L A} and the auxiliary capacitor _{C A} is connected to the TFT _{(T A).} TFT to the gate of the (T _A) is the gate electrode G is connected, the source electrode S ₁ is connected to the source side, further, the other end of the auxiliary capacitor C _A is connected to the storage capacitor reference electrode H _A, voltage applied to the liquid crystal layer L _a is adapted to be adjusted auxiliary. Similarly, the sub-pixel P _B includes the liquid crystal layer L _{B and the} auxiliary capacitor C _B connected to the TFT (T _B ). The gate electrode G is connected to the gate side of the TFT (T _B ), the source electrode S ₁ is connected to the source side, and the other end of the auxiliary capacitor C _B is connected to the auxiliary capacitor reference electrode H _B. voltage applied to the liquid crystal layer L _B is adapted to be adjusted auxiliary. In this embodiment, as the above-described voltage supply means, for example, an auxiliary capacitance reference electrode is provided in the liquid crystal display panel 8, and a voltage value read from the ROM 6 by the auxiliary capacitance signal generation circuit 7 is supplied from each auxiliary capacitance reference electrode to each sub-capacitor. It is configured to supply each pixel.

As described above, the liquid crystal display panel 8 includes the source electrodes S ₁ , S ₂ ,. . . And gate electrodes G ₁ , G ₂ ,. . . Are orthogonal to each other, and a pixel electrode and a transistor for driving the pixel electrode are arranged at the intersection. A driving voltage from the gate driver 9 can be applied to two columns of sub-pixel electrodes with _one gate electrode G (for example, G ₁ ). That is, the red (R), green (G), and blue (B) pixel electrodes constitute one pixel P by the sub-pixels P _A and P _B divided into two. Display in the pixel P is made by the average value of the sub-pixels P _A and P _B.

Then, the auxiliary capacitance signal generating circuit 7, based on the adjustment control of the controller 4 in response to the video information (determination result adjustment control according to the input signal determination unit 2), an auxiliary capacitor reference electrode for the sub-pixel P _A H _a, for each of the auxiliary capacitor reference electrode _{H B} for the sub-pixel _{P B,} a predetermined voltage value for the adjustment control _(P a, _P for _B) with reference to the ROM6 which a plurality prestored sets of a predetermined voltage Supply value voltages individually. The ROM 6 for the auxiliary capacitance signal generation circuit 7 stores a voltage value to be sent to each auxiliary capacitance reference electrode according to the signal type or the operation mode. Therefore, in addition to the voltage supplied from the gate electrode and the gradation voltage supplied from the source electrode, the liquid crystal display panel 8 is applied with a voltage supplied individually to the sub-pixels by the auxiliary capacitance signal generating circuit 7. It becomes. This voltage may be applied to the auxiliary capacitance provided in each subpixel. Further, data may be stored in the ROM 6 so that the voltage of a predetermined value supplied to each sub-pixel is a voltage supplied with a different polarity for each sub-pixel pair.

  FIG. 3 is a diagram for comparing voltage difference enhancement processing between sub-pixels according to the present invention with a conventional example. In the figure, 11 is a graph for explaining the variation of the luminance ratio for each gradation according to the viewing angle according to the conventional example, taking VA (vertical alignment) liquid crystal as an example, and 12 is a voltage difference enhancement process between sub-pixels (normal broadcast). FIG. 12A is a graph for explaining the variation of the luminance ratio for each gradation according to the viewing angle in the mode processing and cinema mode processing), 12a is a schematic diagram of the contrast of each subpixel in the enhancement processing, and 13 is between the subpixels. FIG. 13A is a graph for explaining the variation due to the viewing angle of the luminance ratio for each gradation by the processing (PC mode processing) in which the voltage difference is slightly emphasized; FIG. 13A is a schematic diagram of the contrast difference of each sub-pixel in the enhancement processing; 14 is a schematic diagram of the difference in brightness of each sub-pixel when frame / field switching processing is further performed on these processing. In FIG. 3, the solid line indicates 0 ° (front view), the broken line indicates ± 45 °, and the dotted line indicates ± 60 °.

Referring to FIG. 3, in the control in the normal broadcast mode process and the cinema mode process, the brightness difference due to the voltage difference of the auxiliary capacitance reference electrode between the sub-pixels is more easily generated. On the other hand, it is possible to further eliminate a decrease in contrast at a wide viewing angle, that is, to improve contrast when viewed from an oblique direction. Such control is suitable for moving image specifications that require a wider viewing angle. Further, one frame or every each field assist each other in (each screen unit of the data input to the liquid crystal display panel 8) volume reference electrode H _A, by switching the voltage applied to the H _B, numeral 3 14 As illustrated in the above, it is possible to suppress the difference in brightness due to the apparent voltage difference between the auxiliary capacitance electrodes. In this embodiment, the control means may be provided with switching means for switching the voltage value in the adjustment means between the sub-pixels every predetermined number of frames. For example, the control unit performs control so that voltages having predetermined values individually supplied to the sub-pixels of the pair are alternately switched every predetermined number of frames.

Further, in the control in the PC mode process, the light / dark difference due to the voltage difference of the auxiliary capacitance reference electrode between the sub-pixels is slightly suppressed as compared with the above process. While suppressing the appearance of the contrast between sub-pixels, it is possible to eliminate the decrease in contrast at a wide viewing angle, that is, to improve the contrast when viewed from an oblique direction. Such control is suitable for PCs that are often used alone, that is, for still image specifications. Further, also for this control, the voltage applied to the auxiliary capacitance reference electrodes H _A and H _B is switched for each frame or for each field (each unit of screen data input to the liquid crystal display panel 8). Accordingly, as illustrated by reference numeral 14 in FIG. 3, it is possible to suppress the light / dark difference due to the voltage difference between the auxiliary capacitance electrodes, which suppresses the light / dark difference due to the apparent voltage difference between the auxiliary capacitance electrodes.

  As described above, according to the present embodiment, in the multi-pixel driving type liquid crystal display device, an appropriate viewing angle characteristic is selected according to the video information as a result of the user selecting or detecting the type of video to be displayed on the main body. The gradation characteristics can be provided, and it is possible to eliminate the whitening phenomenon caused by the change in gradation characteristics when viewed from an oblique angle to the front view, particularly when using liquid crystal in the vertical alignment mode, etc. It is also possible to automatically provide gradation characteristics according to video information, elimination of contrast differences between sub-pixels, and high contrast characteristics in a normally black mode. Furthermore, by providing the auxiliary capacitance reference electrode as described above, it is not necessary to provide a source electrode line for each sub-pixel, or to perform gradation conversion of the source voltage for each sub-pixel, and the above-described effects can be obtained. .

  FIG. 4 is a block diagram showing a configuration example of a liquid crystal display device according to another embodiment of the present invention, in which 21 is a video signal input unit, 22 is a user operation unit, 23 is a microcomputer, 24 is a controller, Reference numeral 25 denotes a source driver, 26 denotes a ROM, 27 denotes an auxiliary capacitance signal generation circuit, 28 denotes a liquid crystal display panel, and 29 denotes a gate driver.

  In the liquid crystal display device according to the present embodiment, the display mode for the video information to be displayed is selected instead of the input signal discrimination processing in the liquid crystal display device according to the embodiment described with reference to FIGS. Operation accepting means for accepting a selection operation to be performed from a user is provided. Then, the adjusting unit adjusts the voltage value supplied by the voltage supplying unit individually for each sub-pixel according to the type of the display mode selected by the operation receiving unit. Other processes are as described with reference to FIGS. 1 to 3, and the description thereof will be simplified.

  The operation accepting unit is exemplified by the user operation unit 22, and the adjustment unit is exemplified by the microcomputer 23 that sends a control signal corresponding to the mode selection operation accepted by the user operation unit 22 to the controller 24.

  The video signal input unit 21 inputs a video signal of a moving image or a still image to be displayed by an instruction operation or default setting by a user, and outputs the video signal to the controller 24. Here, the input video signal may be switched by an instruction operation other than the display mode selection from the user operation unit 22. As the instruction operation, for example, when the power is turned on by a power button 22a of a remote controller (hereinafter referred to as a remote controller), the previous setting is read and an input video signal is selected, a direction instruction / decision key 22c or a selection key is selected. For example, the input video signal can be selected after the power is turned on by the station and the position key 22d.

  Then, the user operation unit 22 selects display mode selection as a feature in the present embodiment by using, for example, the mode switching button 22b of the remote controller or the direction instruction and determination key 22c, and sends the result to the microcomputer 23. Also good. The display mode may be set so as to be selected in accordance with switching of input sources such as TV, video 1, video 2 and PC. In this case, the microcomputer 23 includes an input source switching button instead of or separately from the mode switching button 22b, and the display modes corresponding to the input sources of the TV mode / video mode / PC mode according to the operation thereof. Determine. The input source switching button may be a button that is repeated in the order of the television mode, the video 1 mode, the video 2 mode, and the PC mode each time the button is pressed. Furthermore, even if the input source is the same (for example, the same input source is the same television), it is preferable that the display mode selected by the user can be selected so that display control according to the user can be performed.

  The microcomputer 23 controls the controller 24 by issuing a command to the controller 24 based on the display mode selection result from the user operation unit 22. The controller 24 controls the storage capacitor signal generation circuit 27 in addition to the control of the source driver 25 and the gate driver 29, so that video information to be displayed on the liquid crystal display panel 28 (that is, input by the video signal input unit 21). Display control of the liquid crystal display panel 28 according to the display mode selection result in the user operation unit 22. Further, as described above, the controller 24 includes, for example, a drive voltage generation unit, a drive signal generation unit, and a LUT (Look Up Table) (not shown). Further, the source driver 25 and the gate driver 29 are also as described above, and the liquid crystal display panel 28 is as described with the equivalent circuit of FIG.

Then, the auxiliary capacitance signal generation circuit 27 is based on the adjustment control from the controller 24 according to the type of the display mode selected by the user, and the auxiliary capacitance reference electrode H _A for the subpixel P _A and the auxiliary capacitance for the subpixel P _B. for each of the reference electrodes H _B, a predetermined voltage value for the adjustment control (P _a, P for _B) with reference to the ROM26 in which a plurality prestored sets of supplies individually voltage of a predetermined voltage value. The ROM 26 for the auxiliary capacitance signal generation circuit 27 stores a voltage value to be sent to each auxiliary capacitance reference electrode corresponding to the type of display mode.

  FIG. 5 is a flowchart for explaining an example of control in the liquid crystal display device of FIG. In the liquid crystal display device according to the present embodiment, control is started when the user performs a selection operation (step S1) of a display mode (also referred to as a video mode) with the above-described configuration. Hereinafter, an example in which a cinema (theta) mode (for example, a display mode for high-definition broadcast display), a PC mode, and a normal broadcast mode are prepared as display modes to be selected will be described.

  When the theater mode is selected in step S1 (YES in step S2), the auxiliary capacity reference electrode control data for the theater mode is read (step S3), and the data is output (step S4). If NO in step S2, it is determined whether the PC mode has been selected (step S5). When the PC mode is selected, the auxiliary capacity reference electrode control data for the PC mode is read (step S6), and the data is output (step S4). Further, if NO in step S5, it is determined that the remaining normal broadcast mode has been selected, and the auxiliary capacity reference electrode control data for the normal broadcast mode is read (step S7). Output processing is performed (step S4).

Further, in step S4, 1 frame or every one field per aid to each other (the liquid crystal for each unit screen data to be input to the display panel 28) capacitive reference electrode H _A, auxiliary volume basis by switching the applied voltage to the H _B By performing output processing of the electrode control data, control may be performed so as to suppress the light / dark difference due to the voltage difference of the storage capacitor electrode.

  As described above, according to the present embodiment, in a multi-pixel drive type liquid crystal display device, a moving image or a still image is adjusted by adjusting a ratio of applied voltages applied to the sub-pixels according to a display mode selected by a user. It is possible to allow the user to view with the image quality and resolution required at the time of display. For example, it is possible to provide appropriate viewing angle characteristics and gradation characteristics according to the video content by the user's video selection operation, particularly when viewed obliquely from the front view that occurs when using liquid crystal in the vertical alignment mode etc. The whitening phenomenon caused by changes in the gradation characteristics of the image can be eliminated, the gradation characteristics according to the selected video content, the gradation difference between the sub-pixels, and the high contrast characteristics in the normally black mode are automatically applied. Can also be provided. Furthermore, by providing the auxiliary capacitance reference electrode as described above, it is not necessary to provide a source electrode line for each sub-pixel, or to perform gradation conversion of the source voltage for each sub-pixel, and the above-described effects can be obtained. .

  Further, the display control according to the still image / moving image can be performed by setting the type of display mode described above as an image type (video type) indicating whether the video information to be displayed is a still image or a moving image. It becomes possible. This display control is control in which a predetermined value of voltage supplied to each sub-pixel is individually assigned according to the image type. In addition, when the display mode is selected by the user, for example, the display mode for performing the sub-pixel voltage difference emphasis process is selected by the user, the input video information input by the video signal input unit 21 automatically becomes a moving image. As described above, the input source may be automatically switched.

  Display control according to still images / moving images eliminates white-blowing phenomenon caused by changes in tone characteristics when viewed from the front, especially when using liquid crystal in the vertical alignment mode, etc. As a result of user operation, it is possible to improve the white floating phenomenon required at the time of display, eliminate the difference in shade between sub-pixels required at the time of still image display, and provide high contrast characteristics in normally black mode, etc. It is possible to provide a video display state corresponding to the selected mode.

  Further, as another example of the type of display mode described above, by adopting a signal type indicating whether the video information to be displayed is a television signal or an RGB signal, it corresponds to the television signal / RGB signal. Display control is possible. This display control is control in which a predetermined value of voltage supplied to each sub-pixel is individually assigned according to this signal type. Note that RGB signals and television signals generally correspond to still image signals and moving image signals, respectively. However, for example, a moving image as a continuation of still images may be viewed. Further, when the display mode is selected by the user, for example, the display mode for performing the sub-pixel voltage difference emphasis processing (display mode for displaying the television broadcast) is selected by the user, so that the input input by the video signal input unit 21 is performed. The input source may be automatically switched so that the video information automatically becomes a television signal.

  The display control according to the television signal / RGB signal eliminates the whitening phenomenon caused by the change in gradation characteristics when viewed from an oblique direction with respect to the front view, particularly when using a liquid crystal such as a vertical alignment mode, and It is possible to improve the white-blowing phenomenon required at the time of television broadcast signal, eliminate the difference in shade between sub-pixels required at the time of PC screen selection, and provide high contrast characteristics in normally black mode, etc. As a result of the operation, it is possible to provide a video display state corresponding to the selected mode.

  FIG. 6 is a block diagram showing a configuration example of a liquid crystal display device according to another embodiment of the present invention, in which 31 is a video signal input unit, 32 is a user operation unit, 33 is a microcomputer, 34 is a controller, Reference numeral 35 denotes a source driver, 36 denotes a ROM, 37 denotes an auxiliary capacitance signal generation circuit, 38 denotes a liquid crystal display panel, and 39 denotes a gate driver.

  The liquid crystal display device according to the present embodiment is a selection operation for selecting video information to be displayed instead of input signal discrimination processing in the liquid crystal display device according to the embodiment described with reference to FIGS. Is provided with an operation receiving means for receiving from the user. Therefore, the operation accepting unit in the present embodiment accepts a selection operation related to display control, and this selection operation corresponds to an operation such as a channel operation for selecting video information output on the screen by the user's operation. . Then, the adjusting unit adjusts the voltage value supplied by the voltage supplying unit individually for each sub-pixel according to the type of the video information selected by the operation receiving unit. Other processes are as described with reference to FIGS. 1 to 3, and the description thereof will be simplified. In other words, the liquid crystal display device according to the present embodiment is different from the liquid crystal display device according to the embodiment described with reference to FIGS. 4 and 5 in that the viewing control is changed instead of the display control based on the display mode selection. Display control is varied based on the selection of the video itself.

  The operation accepting unit is exemplified by the user operation unit 32, and the adjustment unit is exemplified by the microcomputer 33 that sends a control signal corresponding to the video information received by the user operation unit 32 to the controller 34.

  The video signal input unit 31 inputs a video signal of a moving image or a still image to be displayed by an instruction operation or default setting by a user, and outputs the video signal to the controller 34. Here, the input video signal is switched by a video information selection operation from the user operation unit 32. As this selection operation, for example, by switching the input source by the input source switching button 32b of the remote controller, the video information of the default of the mode (including the default set by the previous selection in the same mode) is selected. In addition, when the power is turned on by the power button 32a, the previous setting is read and the input video signal is selected, and further, the input video after the power is turned on by the direction indication / decision key 32c and the channel selection / position key 32d. For example, selecting a signal. Examples of the input source selected by the input source switching button 32b include television, video 1, video 2, and PC. The input source switching button 32b may be a button that is repeated in the order of the television mode, the video 1 mode, the video 2 mode, and the PC mode each time it is pressed, for example.

  The microcomputer 33 issues a command to the controller 34 to control the controller 34 based on the result of video information selection from the user operation unit 32 (what type of video information is selected). The controller 34 controls the storage capacitor signal generation circuit 37 in addition to the control of the source driver 35 and the gate driver 39, so that the video information to be displayed on the liquid crystal display panel 38 (that is, input by the video signal input unit 31). Display control of the liquid crystal display panel 38 according to the video information selection result in the user operation unit 32. In addition, as described above, the controller 34 includes, for example, a drive voltage generation unit, a drive signal generation unit, and a LUT (Look Up Table) (not shown). Further, the source driver 35 and the gate driver 39 are also as described above, and the liquid crystal display panel 38 is as described together with the equivalent circuit of FIG.

Then, the auxiliary capacitance signal generation circuit 37 is based on the adjustment control from the controller 34 according to the type of the video information selected by the user, and the auxiliary capacitance reference electrode H _A for the subpixel P _A and the auxiliary capacitance for the subpixel P _B. for each of the reference electrodes H _B, a predetermined voltage value for the adjustment control (P _a, P for _B) with reference to the ROM36 in which a plurality prestored sets of supplies individually voltage of a predetermined voltage value. The ROM 36 for the auxiliary capacitance signal generation circuit 37 stores a voltage value to be sent to each auxiliary capacitance reference electrode corresponding to the type of video information.

  In the liquid crystal display device according to the present embodiment, control is started when the user performs an operation of selecting video information desired to be viewed by the configuration as described above. Hereinafter, examples of the types of video information to be selected will be described by taking the display mode corresponding to the type as a theater mode (for example, corresponding to video information of a high-definition broadcast), a PC mode, and a normal broadcast mode.

In this process, step S1 in FIG. 5 is the video information selection operation, and in the determinations in steps S2 and S5, it is sufficient to determine which mode the selected video information type corresponds to (of course, of course). You can assign them in advance). The other processes are the same as those in FIG. Further, in step S4, 1 frame or every one field per aid to each other (the liquid crystal for each unit screen data to be input to the display panel 28) capacitive reference electrode H _A, auxiliary volume basis by switching the applied voltage to the H _B The output processing of the electrode control data can be similarly applied. In this way, in the present embodiment, by selecting video information that the user wants to view, for example, by selecting a television program that the user wants to view, display control according to the video information is automatically performed. . In the present embodiment, as described with reference to FIGS. 1 to 3, an input signal determination unit may be provided to determine which type of video information is input video information. Good.

  As described above, according to the present embodiment, in the multi-pixel driving type liquid crystal display device, it is possible to provide appropriate viewing angle characteristics and gradation characteristics according to the video information selected by the user. It is possible to eliminate the white floating phenomenon caused by the change in gradation characteristics when viewed obliquely from the front view when used, and the gradation characteristics according to the selected video information and the difference in shade between sub-pixels. It is also possible to automatically provide high contrast characteristics during cancellation and normally black mode. Furthermore, by providing the auxiliary capacitance reference electrode as described above, it is not necessary to provide a source electrode line for each sub-pixel, or to perform gradation conversion of the source voltage for each sub-pixel, and the above-described effects can be obtained. .

  In addition, by setting the above-described video information type to an image type (video type) indicating whether the video information to be displayed is a still image or a moving image, display control according to the still image / moving image can be performed. It becomes possible. This display control is control in which a predetermined value of voltage supplied to each sub-pixel is individually assigned according to the image type.

  Display control according to still images / moving images eliminates white-blowing phenomenon caused by changes in tone characteristics when viewed from the front, especially when using liquid crystal in the vertical alignment mode, etc. It is possible to improve the white floating phenomenon required at the time of display, to eliminate the difference in shade between sub-pixels required at the time of still image display, and to provide high contrast characteristics in the normally black mode, etc., which can be selected by user operation Thus, it is possible to provide a video display state corresponding to the video signal.

  In addition, as another example of the type of video information described above, by adopting a signal type indicating whether the video information to be displayed is a television signal or an RGB signal, it corresponds to the television signal / RGB signal. Display control is possible. This display control is control in which a predetermined value of voltage supplied to each sub-pixel is individually assigned according to this signal type.

  The display control according to the television signal / RGB signal eliminates the whitening phenomenon caused by the change in gradation characteristics when viewed from an oblique direction with respect to the front view, particularly when using a liquid crystal such as a vertical alignment mode, and It is possible to improve the white-blowing phenomenon required at the time of television broadcast signal, eliminate the difference in shade between sub-pixels required at the time of PC screen selection, and provide high contrast characteristics in normally black mode, etc. It is possible to provide a video display state corresponding to the video information selected by the operation.

  FIG. 7 is a block diagram showing a configuration example of a liquid crystal display device according to another embodiment of the present invention, in which 41 is a video signal input unit, 42 is a user operation unit, 43 is a microcomputer, 44 is a controller, 45 is a source driver, 46 is a ROM, 47 is an auxiliary capacitance signal generating circuit, 48 is a liquid crystal display panel, and 49 is a gate driver.

  In the liquid crystal display device according to this embodiment, in the liquid crystal display device according to the embodiment described with reference to FIGS. 1 to 3, the input source of the video information to be displayed is switched instead of the input signal discrimination process. It is assumed that source switching means is provided. Then, the adjusting means adjusts the voltage value supplied by the voltage supplying means for each subpixel according to the type of the input source selected by the switching by the source switching means. Other processes are as described with reference to FIGS. 1 to 3, and the description thereof will be simplified. In other words, the liquid crystal display device according to this embodiment is displayed based on display mode selection or video information selection in the liquid crystal display device according to each embodiment described with reference to FIG. 4, FIG. 5, or FIG. 6. Instead of varying the control, the display control is varied based on the selection of the input source.

  The source switching unit is exemplified by the user operation unit 42, and the adjustment unit is exemplified by the microcomputer 43 that sends a control signal corresponding to the input source received by the user operation unit 42 to the controller 44.

  The video signal input unit 41 inputs a video signal of a moving image or a still image that is a display target by an instruction operation or default setting by a user, and outputs the video signal to the controller 44. Here, the input video signal is switched by the source selection operation and the video information selection operation from the user operation unit 42. As this selection operation, for example, by switching the input source with the input source switching button 42b of the remote controller, the video information of the default of the mode (including the default set by the previous selection in the same mode) is selected. In addition, when the power is turned on by the power button 42a, the previous setting is read and the input video signal is selected, and further, the input video after the power is turned on by the direction indication / decision key 42c and the channel selection / position key 42d. For example, selecting a signal. Examples of the input source selected by the input source switching button 42b include television, video 1, video 2, and PC. Further, the input source switching button 42b may be, for example, a button that is repeated in the order of television mode, video 1 mode, video 2 mode, and PC mode each time it is pressed.

  The microcomputer 43 issues a command to the controller 44 to control the controller 44 based on the result of the input source selection from the user operation unit 42 (what type of input source is selected). The controller 44 controls the storage capacitor signal generation circuit 47 in addition to the control of the source driver 45 and the gate driver 49, so that video information to be displayed on the liquid crystal display panel 48 (that is, input by the video signal input unit 41). Display control of the liquid crystal display panel 48 according to the input source selection result in the user operation unit 42. Further, as described above, the controller 44 includes, for example, a drive voltage generation unit, a drive signal generation unit, and a LUT (Look Up Table) (not shown). Further, the source driver 45 and the gate driver 49 are also as described above, and the liquid crystal display panel 48 is as described together with the equivalent circuit of FIG.

Then, the auxiliary capacitance signal generating circuit 47, based on the adjustment control of the controller 44 in accordance with the type of the input source selected by the user, the auxiliary capacitor reference electrode H _A for the sub-pixel P _A, an auxiliary capacitor for the sub-pixel P _B for each of the reference electrodes H _B, a predetermined voltage value for the adjustment control (P _a, P for _B) with reference to the ROM46 in which a plurality prestored sets of supplies individually voltage of a predetermined voltage value. The ROM 46 for the auxiliary capacitance signal generation circuit 47 stores a voltage value to be sent to each auxiliary capacitance reference electrode according to the type of the input source.

  In the liquid crystal display device according to the present embodiment, control is started when the user performs an operation of selecting an input source that the user wants to view, according to the configuration described above. Hereinafter, as examples of the input source type to be selected, the display modes corresponding to the type will be described as an example of a theater mode (for example, an input source for high-definition broadcasting), a PC mode, and a normal broadcast mode.

In this processing, step S1 in FIG. 5 is an input source selection operation, and in the determinations in steps S2 and S5, it is sufficient to determine which mode the type of the selected input source corresponds to (of course, You can assign them in advance). The other processes are the same as those in FIG. Further, in step S4, 1 frame or every one field per assisted (liquid crystal display panel screen for each unit of data to be input to 48) of each other capacitive reference electrode H _A, auxiliary volume basis by switching the applied voltage to the H _B The output processing of the electrode control data can be similarly applied. In this way, in this embodiment, by selecting an input source that the user wants to view, for example, by selecting a certain TV program that the user wants to view, display control according to the input source is automatically performed. Become. Also, in the present embodiment, as described with reference to FIGS. 1 to 3, an input signal determination unit is provided to determine which type of input source is the input source of the input video information. May be.

  As described above, according to the present embodiment, even when the input source is switched or the operation mode is switched by the input source, appropriate viewing angle characteristics and gradation characteristics are provided according to the switched video content. In particular, it is possible to eliminate the white-floating phenomenon associated with the change in gradation characteristics when viewed from an oblique angle with respect to the front view that occurs when using liquid crystal in the vertical alignment mode, etc., and the gradation according to the selected video content Characteristics and a high contrast characteristic in a normally black mode can be provided.

  Further, by setting the type of the input source described above as an image type (video type) indicating whether the video information to be displayed is a still image or a moving image, display control according to the still image / moving image can be performed. It becomes possible. This display control is control in which a predetermined value of voltage supplied to each sub-pixel is individually assigned according to the image type.

  Display control according to still images / moving images eliminates white-blowing phenomenon caused by changes in tone characteristics when viewed from the front, especially when using liquid crystal in the vertical alignment mode, etc. It is possible to improve the white floating phenomenon required at the time of display and to provide high contrast characteristics at the time of normally black mode required at the time of still image display, and to provide a video display state according to the input source. It becomes possible.

  In addition, as another example of the type of the input source described above, by adopting a signal type indicating whether the video information to be displayed is a television signal or an RGB signal, it corresponds to the television signal / RGB signal. Display control is possible. This display control is control in which a predetermined value of voltage supplied to each sub-pixel is individually assigned according to this signal type.

  The display control according to the television signal / RGB signal eliminates the whitening phenomenon caused by the change in gradation characteristics when viewed from an oblique direction with respect to the front view, particularly when using a liquid crystal such as a vertical alignment mode, and It is possible to improve the white floating phenomenon to the extent required at the time of a television broadcast signal, and it is possible to provide a video display state corresponding to the input source.

  As described above, in each of the embodiments described with reference to FIG. 1 to FIG. 7, an actual image is added to each subpixel by adding the voltage value stored in the ROM for the auxiliary capacitance signal generation circuit to the image signal. Since a slightly different voltage value is supplied to the signal, the voltage value of each gradation deviates from an ideal γ characteristic. In particular, a shift at a low gradation number has a large effect. For this reason, in each of the above-described embodiments, it is preferable to correct this low gradation γ characteristic. Hereinafter, an embodiment capable of executing such γ characteristic correction will be described. In the following description of γ characteristic correction, the embodiment described with reference to FIGS. 4 and 5 (display control based on display mode selection by the user) is performed, but the same applies to other embodiments. Applicable.

  FIG. 8 is a block diagram showing a configuration example of a liquid crystal display device according to another embodiment of the present invention, in which 50 is a γ characteristic correction unit, 50a is a reference gradation voltage generation unit, and 50b is a reference gradation. ROM for the voltage generation unit 50a, 51 is a video signal input unit, 52 is a user operation unit, 53 is a microcomputer, 54 is a controller, 55 is a source driver, 56 is a ROM, 57 is an auxiliary capacitance signal generation circuit, and 58 is a liquid crystal display A panel 59 is a gate driver.

  The liquid crystal display device according to the present embodiment includes γ characteristic correction means (gradation characteristic correction means) in the liquid crystal display devices according to the above-described embodiments. This γ characteristic correction means is a means for supplementing the process of adjusting the voltage value supplied by the voltage supply means according to the video information in the adjustment means for each sub-pixel, and is a unit changed by the adjustment process in the adjustment means. This is a means for correcting the gradation characteristics of the pixel. In the embodiment described with reference to FIG. 8 and FIGS. 9 to 13 to be described later, as this γ characteristic correction means, a γ characteristic correction unit 50 (within the controller 54) having a reference gradation voltage generation unit 50a and a ROM 50b for the reference gradation voltage generation unit Alternatively, a part of the source driver 55 may be included), and the γ characteristic correction unit 50 is configured to be able to change the reference gradation voltage. Other processing is as described above, and the description is simplified.

  Moreover, the adjustment means in this embodiment is illustrated by the microcomputer 53 which sends the control signal according to the mode selection operation received in the user operation part 52 to the controller 54 and the reference gradation voltage generation part 50a. The operation accepting unit is exemplified by the user operation unit 52 as in the above-described embodiment.

  The video signal input unit 51 inputs a video signal of a moving image or a still image to be displayed by an instruction operation or default setting by a user, and outputs the video signal to the controller 54 as in the above-described embodiment. Here, the input video signal may be switched by an instruction operation other than the display mode selection from the user operation unit 52. As the instruction operation, for example, when the power is turned on by the power button 52a of the remote controller, the previous setting is read and the input video signal is selected, or the direction instruction / decision key 52c or the tuning / position key 52d is used. For example, the input video signal is selected after the power is turned on. The user operation unit 52 may select display mode selection using, for example, the mode switching button 52b of the remote controller or the direction instruction and determination key 52c, and send the result to the microcomputer 53.

  The microcomputer 53 issues a command to the controller 54 based on the display mode selection result from the user operation unit 52 to control the controller 54, and also to the γ characteristic correction unit 50 (reference gradation voltage generation unit 50a). Control is performed by issuing a command based on the display mode selection result. The controller 54 controls the storage capacitor signal generation circuit 57 in addition to the control of the source driver 55 and the gate driver 59, so that the video information to be displayed on the liquid crystal display panel 58 (that is, input by the video signal input unit 51). Display control of the liquid crystal display panel 58 according to the display mode selection result in the user operation unit 52. Further, as described above, the controller 54 includes, for example, a drive voltage generation unit, a drive signal generation unit, and a LUT (Look Up Table) (not shown). Further, the source driver 55 and the gate driver 59 are also as described above, and the liquid crystal display panel 58 is as described together with the equivalent circuit of FIG.

Then, the auxiliary capacitance signal generating circuit 57, based on the adjustment control of the controller 54 in accordance with the type of display mode selected by the user, the auxiliary capacitor reference electrode H _A for the sub-pixel P _A, an auxiliary capacitor for the sub-pixel P _B for each of the reference electrodes H _B, a predetermined voltage value for the adjustment control (P _a, P for _B) with reference to the ROM56 in which a plurality prestored sets of supplies individually voltage of a predetermined voltage value. The ROM 56 for the auxiliary capacitance signal generation circuit 57 stores a voltage value to be sent to each auxiliary capacitance reference electrode corresponding to the type of display mode.

In the reference gradation voltage generator 50a, a reference voltage value is assigned in advance to a plurality of arbitrarily extracted gradation numbers among the gradation numbers from 0 to 255. For example, V ₁₆ , V ₃₂ , and V ₄₈ are assigned as reference voltage values to the gradation numbers ₁₆ , ₃₂ , and ₄₈ , and V ₃₂ is set to a voltage value between V _{16 and} V ₄₈ . Then, it is possible this sequence of reference gradation voltage is written in each mode or detected video signals to ROM50b for reference gray-scale voltage generating unit 50a, to adjust the value of example V ₃₂ each mode. This method also makes it possible to correct an ideal γ characteristic for a video signal to which a predetermined voltage has been added once. Next, a processing example in the γ characteristic correction unit as a feature of the present embodiment will be described in detail.

  FIG. 9 is a diagram for explaining an example of the γ correction process in the liquid crystal display device of FIG. 8. In FIG. 9, reference numeral 50c denotes a correction based on the reference gradation data used for the γ correction process (a correction based on the reference gradation voltage). 3 is a table showing an example of three reference gradation data for an input gradation.

  As shown in Table 50c, the reference gradation data 1, reference gradation data 2, and reference gradation data 3 are stored in the ROM 50b for the input gradation. For example, the reference gradation data 1 is an example of reference gradation voltage data that is applied when the potential difference of the voltage applied to the reference electrode of the auxiliary capacitor is small with respect to the input gradation data. For input gradation data of 0, 32, 64, 96, 128, 192, and 255, data having reference gradation voltages of 900, 600, 400, 300, 250, 180, and 100 are prepared.

  The reference gradation data 2 is an example of reference gradation voltage data applied when the potential difference of the voltage applied to the reference electrode of the storage capacitor is medium with respect to the input gradation data. Data having reference gradation voltages of 900, 700, 450, 350, 270, 190, and 100 are prepared for input gradation data of 0, 32, 64, 96, 128, 192, and 255, respectively. The reference gradation data 3 is an example of reference gradation voltage data applied when the potential difference of the voltage applied to the reference electrode of the auxiliary capacitor is larger than the input gradation data. Data having reference gradation voltages of 900, 800, 500, 400, 300, 200, and 100 are prepared for input gradation data of 0, 32, 64, 96, 128, 192, and 255, respectively.

  Based on the control signal output from the microcomputer 53 (control signal corresponding to the mode selection operation accepted by the user operation unit 52), the reference gradation voltage generation unit 50a receives the reference gradation data corresponding to the control signal from the ROM 50b. Is output to the source driver 55. For example, when a control signal is sent by a potential difference such as potential difference 1, potential difference 2, potential difference 3 as the control level of the microcomputer 53, reference gradation data 1, reference gradation data 2, reference gradation data corresponding to each potential difference is sent. 3 is read from the ROM 50 b and output to the source driver 55.

  FIG. 10 is a diagram illustrating an example of a gradation voltage generation unit in the source driver corresponding to the reference gradation voltage generation unit in the liquid crystal display device of FIG. In the figure, 60 is an example of a voltage generator in the source driver 55 corresponding to the reference gradation voltage generator 50a.

The voltage generator 60 has terminals VA ₀ , VA ₃₂ ,... For inputting input gradation data of ₀ , ₃₂ , 64, 96, 128, 192, 255. . . , VA ₂₅₅ . These terminals are connected to resistors Ra, Rb,. . . , Rg. A resistance is further provided for subdivision between these gradations. For example, in order to control a fine output voltage between the terminal VA ₀ and the terminal VA ₃₂ , resistors r ₁ , r ₂ ,. . . , R ₃₂ .

The reference gradation voltage generation unit 50a refers to the ROM 50b in response to the control signal from the microcomputer 53, obtains reference gradation data corresponding to each input gradation, and outputs the voltage value to the source driver 55. On the other hand, in the voltage generation unit 60, the input voltages exemplified in the table 50c corresponding to each input gradation (900, 600, 400, 300, 250, 180, 100 V in the case of the reference gradation data 1) are respectively connected to the terminals VA. ₀ , VA ₃₂ ,. . . , VA ₂₅₅ and the output terminals Vd ₀ , Vd ₁ ,. . . , Vd ₂₅₅ is selected. Through such processing, the reference gradation voltage itself is corrected (γ characteristic correction), and further, according to the image data (video information) by the auxiliary capacitance signal generation circuit 57 (in this example, according to the display mode). It is possible to apply an auxiliary capacitance reference voltage for each subpixel.

  FIG. 11 is a diagram illustrating an example of a main part of the reference gradation voltage generation unit in the liquid crystal display device of FIG. In the figure, 61 is an example of a voltage generator in the reference gradation voltage generator 50a, and 62a, 62b,. . . Are D / A converters (DACs), 63a, 63b,. . . Is an amplifier.

The voltage generator 61 illustrated in FIG. 11 is different from the voltage generator 60 of FIG. 10 in that the reference gradation voltage itself is not changed, and the gradation based on the line segment between the gradations is digitally generated by the DAC and the amplifier. Correction (γ characteristic correction) is performed by changing the control. For example, when the input gradation data is 32, VA ₃₂ data (data 600 as an example of the reference gradation data 1) is input to the voltage generator 61 to the DAC 62b and amplified by the amplifier 63b. The output voltage Vd ₃₂ is output to the source driver 55. The conversion value in each DAC may be given from the microcomputer 53 side. This process is heavier than the process described with reference to FIG. 10, but if it is 8 bits, it is output as 8 bits. Through such processing, the reference gradation voltage is corrected by correcting the input signal (γ characteristic correction), and further, according to the image data (video information) by the auxiliary capacitance signal generation circuit 57 (however, in this example) Then, it is possible to apply an auxiliary capacitance reference voltage for each sub-pixel (according to the display mode).

  FIG. 12 is a flowchart for explaining an example of control in the liquid crystal display device of FIG. In the liquid crystal display device according to the present embodiment, control is started when the user performs a selection operation (step S11) of a display mode (also referred to as a video mode) with the above-described configuration. Hereinafter, examples in which a theater mode (for example, corresponding to a display mode for high-definition broadcast display), a PC mode, and a normal broadcast mode are prepared as display modes to be selected and switched will be described.

  When the theater mode is selected in step S11 (YES in step S12), the auxiliary capacity reference electrode control data for the theater mode and the gradation reference voltage control data for the theater mode are read (step S13). Is output (step S14). If NO in step S12, it is determined whether the PC mode has been selected (step S15). When the PC mode is selected, the auxiliary capacity reference electrode control data for the PC mode and the gradation reference voltage control data for the PC mode are read (step S16), and these data are output (step S14). Further, if NO in step S15, it is determined that the remaining normal broadcast mode has been selected, so that the auxiliary capacity reference electrode control data for the normal broadcast mode and the gradation reference voltage control data for the normal broadcast mode are determined. Is read (step S17), and the data is output (step S14).

Further, in step S14, 1 frame or every one field per aid to each other (the liquid crystal for each unit screen data to be input to the display panel 58) capacitive reference electrode H _A, auxiliary volume basis by switching the applied voltage to the H _B By controlling the output of the electrode control data and the gradation reference voltage control data, it may be controlled to suppress the light / dark difference due to the voltage difference of the storage capacitor electrode. In addition, regarding the types of display modes described above, display control according to still images / moving images and display control according to television signals / RGB signals may be possible.

  FIG. 13 is a diagram for comparing the case where the γ characteristic correction processing described in FIGS. 8 to 12 is performed with the case where it is not, and FIG. 13A is a diagram illustrating voltage difference enhancement between sub-pixels according to the present invention. FIG. 13B is a graph for explaining the variation of the luminance ratio for each gradation depending on the viewing angle when the processing (in normal broadcast mode and cinema mode) is performed without correcting the γ characteristic. FIG. 6 is a graph for explaining the variation of the luminance ratio for each gradation depending on the viewing angle when the voltage difference enhancement processing (same mode) between subpixels is performed with γ characteristic correction. In FIG. 13, the solid line indicates 0 ° (front view), the broken line indicates ± 45 °, and the dotted line indicates ± 60 °.

  As shown in FIG. 13A, when only the sub-pixel voltage difference enhancement process is performed, a voltage (auxiliary capacitance component voltage) other than the gradation voltage is added to each sub-pixel. It can be seen that the characteristic draws a curve away from the ideal curve (ideal γ curve (γ = 2.2 to 2.4)). On the other hand, when a process combining the inter-subpixel voltage difference enhancement process and the γ characteristic correction process is performed, the ideal is obtained in any of 0 °, ± 45 °, and ± 60 ° in FIG. 13B. As can be seen from the fact that the γ curve is approaching, the ideal γ characteristic is achieved against the deviation of the γ characteristic that occurs as a result of gradation voltage correction for each sub-pixel once to improve the viewing angle. It becomes possible to correct, and to provide a γ characteristic suitable for each mode. According to the present embodiment, the gradation due to the change in the gradation characteristic (γ characteristic) (particularly the change in the halftone is remarkable) that can be caused by optimizing the voltage ratio between the sub-pixels in order to improve the viewing angle characteristic. It is possible to eliminate the floating or sinking phenomenon of the tonal characteristics.

  Next, another embodiment capable of executing γ characteristic correction will be described. In the description of the γ characteristic correction described here, the embodiment described with reference to FIGS. 4 and 5 (display control based on display mode selection by the user) is performed. The same applies. Further, in this embodiment, for the sake of simplification of description, a description will be given centering on portions different from the embodiment described with reference to FIGS.

  FIG. 14 is a block diagram showing a configuration example of a liquid crystal display device according to another embodiment of the present invention, in which 70 is a γ characteristic correction unit, 70a is a gradation conversion unit, and 70b is a gradation conversion unit 70a. ROM, 71 is a video signal input unit, 72 is a user operation unit, 73 is a microcomputer, 74 is a controller, 75 is a source driver, 76 is ROM, 77 is an auxiliary capacitance signal generation circuit, 78 is a liquid crystal display panel, and 79 is It is a gate driver.

  The liquid crystal display device according to this embodiment is the same as the liquid crystal display device according to the embodiment described with reference to FIGS. 8 to 13, but includes other γ characteristic correction means (gradation characteristic correction means). This γ characteristic correction means is a means for supplementing the process of adjusting the voltage value supplied by the voltage supply means according to the video information in the adjustment means for each sub-pixel, and is a unit changed by the adjustment process in the adjustment means. This is a means for correcting the gradation characteristics of the pixel. The present embodiment includes a γ characteristic correction unit 70 (which may be included in the controller 74) having a gradation conversion unit 70a and a ROM 70b for the gradation conversion unit 70a as the γ characteristic correction unit. It is assumed that the potential difference is adjusted by, for example, color discrimination of the display image so that the gradation data can be changed. Other processing is as described above, and the description is simplified.

  Moreover, the adjustment means in this embodiment is illustrated by the microcomputer 73 which sends the control signal according to the mode selection operation received in the user operation part 72 to the controller 74 and the gradation conversion part 70a. The operation accepting unit is exemplified by the user operation unit 72 as in the above-described embodiment. The video signal input unit 71 is the same as that in the above-described embodiment, including a power button 72a, a menu button 72b, a direction instruction and determination key 72c, a remote control including a channel selection and position key 72d, and the like.

  The microcomputer 73 issues a command to the controller 74 based on the display mode selection result from the user operation unit 72 to control the controller 74, and also displays the display mode for the γ characteristic correction unit 70 (gradation conversion unit 70 a). Control is performed by issuing a command based on the selection result. The controller 75 controls the storage capacitor signal generation circuit 77 in addition to the control of the source driver 75 and the gate driver 79, so that video information to be displayed on the liquid crystal display panel 78 (that is, input by the video signal input unit 71). Display control of the liquid crystal display panel 78 according to the display mode selection result in the user operation unit 72. Further, as described above, the controller 74 includes, for example, a drive voltage generation unit, a drive signal generation unit, and a LUT (Look Up Table) (not shown). Further, the source driver 75, the gate driver 79, and the auxiliary capacitance signal generating circuit 77 are also as described above, and the liquid crystal display panel 78 is as described together with the equivalent circuit of FIG.

  In the gradation conversion unit 70a, correction values are assigned in advance to the number of gradations from 0 to 255, and the correction result of the video information (image data) based on the correction values is output to the controller 74. That is, in order to correct the low gradation γ characteristic, a different gradation value is provided for each gradation in the ROM 70b for the gradation converting unit 70a. This method also makes it possible to correct an ideal γ characteristic for a video signal to which a predetermined voltage has been added once. Next, a processing example in the γ characteristic correction unit as a feature of the present embodiment will be described in detail.

  FIG. 15 is a diagram for explaining an example of the γ correction process in the liquid crystal display device of FIG. 14. In FIG. 15, reference numeral 70 c denotes correction based on the gradation correction data used for the γ correction process (correction using the γ table). It is a table | surface which shows the example of the three gradation correction data with respect to the input gradation as an example.

  As shown in Table 70c, gradation correction data 1, gradation correction data 2, and gradation correction data 3 are stored in the ROM 70b for the input gradation. For example, the gradation correction data 1 is an example of output gradation data that is applied when the potential difference of the voltage applied to the reference electrode of the auxiliary capacitor is small with respect to the input gradation data. 0, 1, 2, 3, 4,. . . , 50, 51, 52,. . . , 255 for the input gradation data of 0, 2, 4, 6, 8,. . . 70, 71, 72,. . . , 255 output gradation data is prepared.

  The gradation correction data 2 is an example of output gradation data that is applied when the potential difference of the voltage applied to the reference electrode of the auxiliary capacitor is medium with respect to the input gradation data. 0, 1, 2, 3, 4,. . . , 50, 51, 52,. . . , 255 for the input gradation data of 0, 1, 3, 5, 7,. . . 60, 61, 62,. . . , 255 output gradation data is prepared. The gradation correction data 3 is an example of output gradation data applied when the potential difference of the voltage applied to the reference electrode of the auxiliary capacitor is larger than the input gradation data. 0, 1, 2, 3, 4,. . . , 50, 51, 52,. . . , 255 for the input gradation data, 0, 1, 2, 3, 4,. . . , 50, 51, 52,. . . , 255 output gradation data is prepared.

  The gradation conversion unit 70a selects gradation correction data corresponding to the control signal from the ROM 70b based on the control signal output from the microcomputer 73 (control signal corresponding to the mode selection operation received by the user operation unit 72). And output to the controller 74. For example, when a control signal is sent by a potential difference such as potential difference 1, potential difference 2, potential difference 3 as the control level of the microcomputer 73, gradation correction data 1, gradation correction data 2, gradation correction data corresponding to each potential difference. 3 is read from the ROM 70 b and output to the controller 74.

In the liquid crystal display device according to the present embodiment, control is started when the display mode is selected by the user, as in the control flow of FIG. In the control flow of FIG. 12, the γ characteristic correction processing according to the present embodiment is not the auxiliary capacitance reference electrode control data and the gradation reference voltage control data, but the auxiliary capacitance reference electrode control data when reading the data for each mode. In addition, the gradation correction control data is read, and the data is output. Further, one frame or every each field of each other auxiliary capacitor reference electrode H _A (crystal units each screen data to be input to the display panel _78), switches the applied voltage to the H _B auxiliary capacitor reference electrode control data and The form in which the gradation correction control data is output can be similarly applied, and control may be performed so as to suppress the light / dark difference due to the voltage difference of the auxiliary capacitance electrode. In addition, regarding the types of display modes described above, display control according to still images / moving images and display control according to television signals / RGB signals may be possible. Also in the γ characteristic correction processing according to this embodiment, as illustrated in FIG. 13, the ideal γ curve is approached in any case of 0 °, ± 45 °, and ± 60 °.

  Further, as an embodiment capable of executing the γ characteristic correction, the embodiment described with reference to FIGS. 8 to 13 may be combined with the embodiment described with reference to FIGS. The form will be briefly described. The details can be understood by referring to the original embodiment.

  FIG. 16 is a block diagram showing a configuration example of a liquid crystal display device according to another embodiment of the present invention, in which 80 is a γ characteristic correction unit, 80a is a gradation conversion unit, and 80b is a gradation conversion unit 80a. ROM, 80c is a reference gradation voltage generating unit, 80d is a ROM for the reference gradation voltage generating unit 80c, 81 is a video signal input unit, 82 is a user operation unit, 83 is a microcomputer, 84 is a controller, and 85 is a source. A driver 86 is a ROM, 87 is an auxiliary capacitance signal generating circuit, 88 is a liquid crystal display panel, and 89 is a gate driver.

  In the liquid crystal display device according to the present embodiment, as a γ characteristic correcting unit, a γ characteristic correcting unit 80 (controller 84) having a gradation converting unit 80a and a ROM 80b for the gradation converting unit 80a, and a reference gradation voltage generating unit 80c and a ROM 80d for the same. It is assumed that the γ characteristic correction unit 80 is configured to be able to change the reference gradation voltage and gradation data. Other processing is as described above, and the description is simplified.

  The adjustment means in this embodiment is exemplified by the microcomputer 83 that sends a control signal corresponding to the mode selection operation received by the user operation unit 82 to the controller 84, the gradation conversion unit 80a, and the reference gradation voltage generation unit 80c. To do. The operation accepting unit is exemplified by the user operation unit 82 as in the above-described embodiment. The video signal input unit 81 is the same as that of the above-described embodiment, including a remote control including a power button 82a, a menu button 82b, a direction instruction and determination key 82c, a channel selection and position key 82d, and the like.

  The microcomputer 83 issues a command to the controller 84 based on the display mode selection result from the user operation unit 82 to control the controller 84, and the γ characteristic correction unit 80 (the gradation conversion unit 80 a and the reference gradation voltage generation unit). A control based on the display mode selection result is issued for 80c). The controller 85 controls the storage capacitor signal generation circuit 87 in addition to the control of the source driver 85 and the gate driver 89, so that the video information to be displayed on the liquid crystal display panel 88 (that is, input by the video signal input unit 81). Display control of the liquid crystal display panel 88 according to the display mode selection result in the user operation unit 82. Further, as illustrated, the controller 84 includes, for example, a drive voltage generation unit, a drive signal generation unit, and a LUT (Look Up Table) (not shown). Further, the source driver 85, the gate driver 89, and the auxiliary capacitance signal generating circuit 87 are also as described above, and the liquid crystal display panel 88 is as described with the equivalent circuit of FIG.

  The gradation conversion unit 80a selects gradation correction data corresponding to the control signal from the ROM 80b based on the control signal output from the microcomputer 83 (control signal corresponding to the mode selection operation received by the user operation unit 82). And output to the controller 84. For example, when a control signal is sent by a potential difference such as potential difference 1, potential difference 2, potential difference 3 as the control level of the microcomputer 83, gradation correction data 1, gradation correction data 2, gradation correction data corresponding to each potential difference. 3 is read from the ROM 80 a and output to the controller 84.

  Based on the control signal output from the microcomputer 83 (control signal corresponding to the mode selection operation received by the user operation unit 82), the reference gradation voltage generation unit 80c receives reference gradation data corresponding to the control signal from the ROM 80d. Is output to the source driver 85. For example, when a control signal is sent by a potential difference such as potential difference 1, potential difference 2, potential difference 3 as a control level of the microcomputer 83, reference gradation data 1, reference gradation data 2, reference gradation data corresponding to each potential difference. 3 is read from the ROM 80d and output to the source driver 85.

In the liquid crystal display device according to the present embodiment, control is started when the display mode is selected by the user, as in the control flow of FIG. In the control flow of FIG. 12, the γ characteristic correction process according to the present embodiment is not limited to the auxiliary capacitance reference electrode control data and the gradation reference voltage control data, but also the gradation correction control data when reading the data for each mode. Is also read and the data is output. Further, one frame or every one field per assisted (liquid crystal display screen for each unit of data to be input to the panel 88) of mutual capacitance reference electrode H _A, switches the applied voltage to the H _B, auxiliary capacitor reference electrode control data Similarly, the output processing of the gradation reference voltage control data and the gradation correction control data can be applied in the same manner, and control may be performed so as to suppress the light / dark difference due to the voltage difference of the auxiliary capacitance electrode. In addition, regarding the types of display modes described above, display control according to still images / moving images and display control according to television signals / RGB signals may be possible. Also in the γ characteristic correction processing according to this embodiment, as illustrated in FIG. 13, the ideal γ curve is approached in any case of 0 °, ± 45 °, and ± 60 °.

Next, the voltage applied to the auxiliary capacitance reference electrodes H _A and H _B is described for each frame or for each field (each unit of screen data input to the liquid crystal display panel) described in each of the above-described embodiments. A supplementary description will be given of a mode in which control data such as auxiliary capacitance reference electrode control data is output by switching.

  FIG. 17 is a diagram for explaining in detail a control example in the normal broadcast mode and the cinema mode as a control example of the liquid crystal display device of FIG. 16, and FIG. 17A shows each frame of the auxiliary capacitance electrode with respect to the vertical synchronization signal. FIG. 17B is a timing chart for explaining the control of each of the gradation voltage with respect to the horizontal synchronization signal and the control of the voltage applied to each sub-pixel for each frame. FIG. FIG. 17C is a diagram for describing the control example based on the brightness of the sub-pixels. FIG. 17C is a diagram for illustrating the control example based on the brightness of each sub-pixel for the frame (n + 1).

17B and 17C, the upper left red sub-pixel Ra and the sub-pixel Rb paired with the red sub-pixel Ra will be described. For the frame (n), at the same time as the vertical synchronization signal Vsync, the auxiliary capacitance electrode _HA to the voltage Vlca applied, an auxiliary capacitor electrode _{H B} voltage Vlcb applied to, their voltage values V1, V2 is, by switching to frame (n + 1), is switched to the reverse. On the other hand, the grayscale voltage Vsig is sent to the source line simultaneously with the horizontal synchronization signal (gate pulse) Hsync for the frame (n), and the horizontal synchronization is also performed for the frame (n + 1) when switching from the frame (n). Simultaneously with the signal (gate pulse) Hsync, the gradation voltage Vsig is sent to the source line.

For the frame (n), simultaneously with the horizontal synchronization signal Hsync, the voltage to the auxiliary capacitance electrode _HA in addition to the gradation voltage Vsig is added to the source line for the subpixel Ra, and Vsig is applied to the subpixel Ra. −Vlca = Vsig−V1 is applied. When shifting to the frame (n + 1), simultaneously with the horizontal synchronization signal Hsync, the voltage applied to the subpixel Ra is switched to Vsig−Vlca = Vsig−V2. As a result, the sub-pixel Ra becomes bright in the frame (n) as shown in FIG. 17B and dark in the frame (n + 1) as shown in FIG. On the other hand, for the sub-pixel Rb, relative to the frame (n), the voltage of the storage capacitor electrode _{H B} in addition to gray scale voltage Vsig to the horizontal synchronizing signal Hsync simultaneously source lines are added, Vsig-Vlcb = Vsig- V2 is applied. When shifting to the frame (n + 1), simultaneously with the horizontal synchronization signal Hsync, the voltage applied to the sub-pixel Rb is switched to Vsig−Vlca = Vsig−V1. As a result, the sub-pixel Rb is dark in the frame (n) as shown in FIG. 17B and bright in the frame (n + 1) as shown in FIG. In this way, by switching the voltage applied to each auxiliary capacitance electrode for each frame or field, as illustrated by reference numeral 14 in FIG. 3, it is possible to suppress the difference in brightness due to the apparent voltage difference between the auxiliary capacitance electrodes. it can. In the control in the normal broadcast mode and the cinema mode, such a switching is particularly preferable because the difference in brightness due to the voltage difference of the auxiliary capacitance electrode between the sub-pixels is more likely to occur.

  FIG. 18 is a diagram for explaining in detail a control example in the PC mode as a control example of the liquid crystal display device of FIG. 16, and FIG. 18A shows the control of the auxiliary capacitance electrode for each frame with respect to the vertical synchronization signal, and FIG. 18B is a timing chart for explaining frame-by-frame control of the grayscale voltage with respect to the horizontal synchronization signal and the voltage applied to each sub-pixel. FIG. 18B shows a control example of the brightness of each sub-pixel with respect to frame (n). FIG. 18C is a diagram for explaining the control example based on the brightness of each sub-pixel with respect to the frame (n + 1).

18B and 18C, the upper left red sub-pixel Ra and the sub-pixel Rb paired with the red sub-pixel Ra will be described. For the frame (n), at the same time as the vertical synchronization signal Vsync, the auxiliary capacitance electrode _HA the voltage Vlca is applied, a voltage Vlcb applied to the auxiliary capacitance electrode _{H B,} their voltage values V1pc (<V1), V2pc ( <V2) is, by switching to frame (n + 1), is switched to the reverse. On the other hand, the grayscale voltage Vsig is sent to the source line simultaneously with the horizontal synchronization signal (gate pulse) Hsync for the frame (n), and the horizontal synchronization is also performed for the frame (n + 1) when switching from the frame (n). Simultaneously with the signal (gate pulse) Hsync, the gradation voltage Vsig is sent to the source line.

For the frame (n), simultaneously with the horizontal synchronization signal Hsync, the voltage to the auxiliary capacitance electrode _HA in addition to the gradation voltage Vsig is added to the source line for the subpixel Ra, and Vsig is applied to the subpixel Ra. −Vlca = Vsig−V1pc is applied. When shifting to the frame (n + 1), simultaneously with the horizontal synchronization signal Hsync, the voltage applied to the sub-pixel Ra is switched to Vsig−Vlca = Vsig−V2pc. As a result, the sub-pixel Ra becomes bright in the frame (n) as shown in FIG. 18B and dark in the frame (n + 1) as shown in FIG. On the other hand, for the sub-pixel Rb, relative to the frame (n), the voltage of the storage capacitor electrode _{H B} in addition to gray scale voltage Vsig to the horizontal synchronizing signal Hsync simultaneously source lines are added, Vsig-Vlcb = Vsig- V2pc is applied. When shifting to the frame (n + 1), simultaneously with the horizontal synchronization signal Hsync, the voltage applied to the sub-pixel Rb is switched to Vsig−Vlca = Vsig−V1pc. As a result, the sub-pixel Rb is dark in the frame (n) as shown in FIG. 18B and bright in the frame (n + 1) as shown in FIG. 18C. In this way, by switching the voltage applied to each auxiliary capacitance electrode for each frame or field, as illustrated by reference numeral 14 in FIG. 3, it is possible to suppress the difference in brightness due to the apparent voltage difference between the auxiliary capacitance electrodes. it can. Even in the control in the PC mode, such a switching is preferable because there is a light / dark difference due to the voltage difference of the auxiliary capacitance electrode between the sub-pixels.

  In the embodiments of the present invention, the voltage applied to the auxiliary capacitance electrode is described as a DC voltage, but the data voltage (voltage applied from the source electrode) is driven by line inversion, frame inversion, or dot inversion driving. In this case, since the effective value of the voltage applied to the auxiliary capacitor also acts, the voltage applied to the auxiliary capacitor reference voltage is applied with a voltage whose polarity is inverted with respect to the reference voltage of the liquid crystal layer. Also good.

It is a block diagram which shows one structural example of the liquid crystal display device which concerns on one Embodiment of this invention. It is a figure which shows an example of the equivalent circuit of the liquid crystal display panel in the liquid crystal display device of FIG. It is a figure for comparing the voltage difference emphasis process between the sub-pixels by this invention with a prior art example. It is a block diagram which shows one structural example of the liquid crystal display device which concerns on other embodiment of this invention. FIG. 5 is a flowchart for explaining an example of control in the liquid crystal display device of FIG. 4. It is a block diagram which shows one structural example of the liquid crystal display device which concerns on other embodiment of this invention. It is a block diagram which shows one structural example of the liquid crystal display device which concerns on other embodiment of this invention. It is a block diagram which shows one structural example of the liquid crystal display device which concerns on other embodiment of this invention. It is a figure for demonstrating an example of the (gamma) correction process in the liquid crystal display device of FIG. FIG. 9 is a diagram illustrating an example of a gradation voltage generation unit in a source driver corresponding to a reference gradation voltage generation unit in the liquid crystal display device of FIG. 8. It is a figure which shows the example of the principal part of the reference | standard gradation voltage generation part in the liquid crystal display device of FIG. It is a flowchart for demonstrating the example of control in the liquid crystal display device of FIG. FIG. 13 is a diagram for comparing the case where the γ characteristic correction processing described with reference to FIGS. 8 to 12 is performed with the case where it is not. It is a block diagram which shows one structural example of the liquid crystal display device which concerns on other embodiment of this invention. It is a figure for demonstrating an example of the (gamma) correction process in the liquid crystal display device of FIG. It is a block diagram which shows one structural example of the liquid crystal display device which concerns on other embodiment of this invention. FIG. 17 is a diagram for explaining in detail a control example in a normal broadcast mode and a cinema mode as a control example of the liquid crystal display device in FIG. 16. It is a figure for demonstrating in detail the example of control in PC mode as an example of control of the liquid crystal display device of FIG.

Explanation of symbols

1, 21, 31, 41, 51, 71, 81... Video signal input unit, 2... Input signal determination unit, 3, 23, 33, 43, 53, 73, 83. 34, 44, 54, 74, 84 ... controller, 5, 25, 35, 45, 55, 75, 85 ... source driver, 6, 26, 36, 46, 50b, 56, 70b, 76, 80b, 80d, 86 ... ROM, 7, 27, 37, 47, 57, 77, 87 ... Auxiliary capacitance signal generating circuit, 8, 28, 38, 48, 58, 78, 88 ... Liquid crystal display panel, 9, 29, 39, 49, 59 79, 89... Gate driver, 22, 32, 42, 52, 72, 82... User operation unit, 50, 70, 80... Gamma characteristic correction unit, 50a, 80c. Tone conversion unit.

Claims (7)

  A liquid crystal display panel having a plurality of unit pixels connected to a source electrode and a gate electrode and having a plurality of subpixels in each unit pixel and capable of gradation display, and depending on video information to be displayed, A gradation voltage supplied from the source electrode to each of a plurality of sub-pixels configured in the unit pixel, the liquid crystal display device including a control unit that performs display control of video information in the liquid crystal display panel In addition, a voltage supply unit that individually supplies a voltage having a predetermined voltage value is provided, and the control unit adjusts the voltage value supplied by the voltage supply unit individually for each sub-pixel according to the video information. A liquid crystal display device comprising adjusting means.   2. The liquid crystal display device according to claim 1, wherein the voltage supply unit includes an auxiliary capacitance reference electrode in which each sub-pixel in the unit pixel is separately connected, and the voltage value is supplied from each auxiliary capacitance reference electrode. A liquid crystal display device, wherein the liquid crystal display device is supplied for each subpixel.   3. The liquid crystal display device according to claim 1, further comprising: an operation receiving unit that receives a selection operation for selecting a display mode for the video information to be displayed from a user, and the adjustment unit is selected by the operation receiving unit. A liquid crystal display device, wherein the voltage value supplied by the voltage supply means is adjusted individually for each sub-pixel according to the type of display mode.   3. The liquid crystal display device according to claim 1, further comprising: an operation reception unit that receives a selection operation for selecting the video information to be displayed from a user, wherein the adjustment unit is the video selected by the operation reception unit. A liquid crystal display device, wherein the voltage value supplied by the voltage supply means is adjusted individually for each sub-pixel according to the type of information.   3. The liquid crystal display device according to claim 1, further comprising: a source switching unit that switches an input source of the video information to be displayed, wherein the adjustment unit is configured to switch an input source selected by switching in the source switching unit. A liquid crystal display device, wherein the voltage value supplied by the voltage supply means is adjusted individually for each sub-pixel according to the type.   6. The liquid crystal display device according to claim 3, wherein the type is an image type indicating whether the video information to be displayed is a still image or a moving image. Display device.   6. The liquid crystal display device according to claim 3, wherein the type is a signal type indicating whether video information to be displayed is a television signal or an RGB signal. Liquid crystal display device.

Images