JP2009276595A - Liquid crystal display panel and liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve gradation crushing in an all-purpose way without using a single-purpose driver IC for correcting an application voltage on a liquid crystal corresponding to pixels of each color. <P>SOLUTION: A liquid crystal display 1 includes a liquid crystal display panel 2 having a plurality of pixels. A resistance value between a liquid crystal 15 and the drain of a TFT (switching element) in each pixel differs depending on a color to be displayed in the pixel. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a liquid crystal display panel and a liquid crystal display device for displaying an image in color.

  Conventionally, several techniques have been disclosed as methods for improving the transmittance of each color of liquid crystal in a liquid crystal display device.

  In Patent Document 1, a drive circuit (hereinafter referred to as a driver IC) that corrects the value of the voltage applied to the liquid crystal corresponding to each of RGB of the color filter to correctly display the color is created to drive the display. A technique for preventing gradation collapse is disclosed.

  According to this technique, it is possible to perform optimum gamma correction that is sufficiently adapted to the characteristics of the color liquid crystal display. Further, even when gradation collapse occurs in any specific color of red, green, and blue, gradation collapse of that color can be removed.

  However, in the technique of Patent Document 1, the design load on the driver IC side increases. At the same time, since the driver IC loses versatility, it cannot be diverted to a panel having another pixel arrangement.

  Thus, several techniques for improving optical characteristics without requiring driver IC design have been developed and will be described below.

  Patent Document 2 discloses a technique for forming a charge storage capacitor between a pixel electrode and a source wiring in a liquid crystal device using a horizontal electric field type liquid crystal display element.

  According to this technique, the charge storage capacity of each pixel of RGB is set so as to satisfy a certain relationship in advance, and the applied voltage at which the maximum luminance is obtained in each of the RGB color display units is made constant, so that the luminance can be reduced. Prevent loss.

  However, the technique of Patent Document 2 cannot be applied to liquid crystal display elements other than the lateral electric field method. For example, the present invention cannot be applied to a TN (twisted nematic) mode widely used in an active matrix type liquid crystal display element.

  A technical example of a liquid crystal display element that is not limited to the horizontal electric field method will be described below.

  Patent Document 3 discloses a technique for connecting a transparent electrode to a wiring having a different resistance in a display device in which one pixel is composed of sub-pixels having different areas.

According to this technique, transparent electrodes of subpixels having different areas are connected to wirings having different resistances. As a result, the delay characteristic (the rise time and fall time of the waveform) of the drive waveform applied to the liquid crystal, which is different for each subpixel, is eliminated. Therefore, it can be expected that the luminance unevenness of the screen and the gradation are lowered.
JP 2001-134242 (release date: May 18, 2001) JP 2003-241213 (release date: August 27, 2003) JP-A-9-269478 (release date: October 14, 1997)

  However, the above-described prior art has the following problems. Since the technique described in Patent Document 1 requires a dedicated driver IC, the configuration becomes complicated and the cost increases. In the techniques of Patent Documents 2 and 3, application is limited only to specific liquid crystal display devices.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to eliminate the need for a dedicated driver IC for correcting the liquid crystal applied voltage corresponding to each color pixel, and to reduce the gradation in general. An object is to provide a liquid crystal display panel and a liquid crystal display device that can be improved.

A liquid crystal display panel having a plurality of pixels,
The resistance value between the liquid crystal and the drain of the switching element in the pixel is different depending on the color displayed by the pixel.

  According to the above configuration, the liquid crystal display panel has a plurality of pixels. The plurality of pixels display different colors. The different colors here are, for example, the three primary colors of colored light. In the present liquid crystal display panel, the resistance value between the liquid crystal and the drain of the switching element in each pixel differs depending on the color displayed by the pixel. Thereby, the effective voltage applied to the liquid crystal part corresponding to each pixel at the time of voltage application can be varied. That is, it is possible to apply a voltage that maximizes the transmittance of each color to the pixels of each color.

  As described above, the liquid crystal display panel changes the effective voltage for each pixel by changing the resistance in each pixel. As a result, it is possible to avoid gradation collapse in each pixel and improve the transmittance of the entire pixel of the liquid crystal display panel. Further, such an effect can be realized without requiring a dedicated IC driver.

  As described above, the liquid crystal display panel according to the present invention avoids the collapse of gradation in each pixel by changing the effective voltage applied to the liquid crystal for each color pixel, and the entire pixel included in the liquid crystal display panel. There is an effect of improving the transmittance.

Embodiment 1
A liquid crystal display device according to a first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

  FIG. 1 is a diagram showing a schematic configuration of a liquid crystal display device 1 according to an embodiment of the present invention. As shown in FIG. 1, the liquid crystal display device 1 includes a liquid crystal display panel 2.

  FIG. 2 is a cross-sectional view of the liquid crystal display panel 2 according to an embodiment of the present invention. As shown in FIG. 2, the liquid crystal display panel 2 includes a color filter substrate 10, a black matrix 11, color filters 12 and 13, a common electrode 14, a liquid crystal 15, a pixel electrode 16, through holes 17 and 18, a source electrode 19, and a transparent electrode. An insulating film 20, an interlayer insulating film 21, a TFT (Thin Film Transistor) substrate 22, an auxiliary capacitor 23, and a gate bus line 24 are provided. The color filter 12 is a green color filter, and the color filter 13 is a blue color filter. The material of the common electrode 14 and the pixel electrode 16 is ITO (Indium Tin Oxide), respectively. The through hole 17 is provided in the transparent insulating film 20 on the green color filter 12 side, and the through hole 18 is provided in the transparent insulating film 20 on the blue color filter 13 side. Details of each member will be described later. Hereinafter, a pixel having the color filter 12 is referred to as a “green pixel”, and a pixel having the color filter 13 is referred to as a “blue pixel”.

  First, the configuration of the liquid crystal display panel 2 will be described below with reference to FIG.

  As shown in FIG. 2, in the liquid crystal display panel 2, a liquid crystal 15 is sandwiched therebetween, and a color filter substrate 10 is disposed on one side and a TFT substrate 22 is disposed on the other side. On the color filter substrate 10, a black matrix 11, a color filter 12, and a color filter 13 are formed. In order to prevent light leakage at the boundary between the color filter 12 and the color filter 13, a black matrix 11 is disposed between the two. A common electrode 14 is further formed on the color filters 12 and 13 and the black matrix.

  On the other hand, an auxiliary capacitor 23 and a gate bus line 24 are formed on the TFT substrate 22, and the interlayer insulating film 21 covers them. A source electrode 19 is formed on the portion of the interlayer insulating film 21 where the auxiliary capacitance 23 is formed. A transparent insulating film 20 is formed on the interlayer insulating film 21, and a pixel electrode 16 corresponding to each pixel of the color filter 12 and the color filter 13 is further formed thereon. The pixel electrode 16 is connected to the source electrode 19 through the through hole 17 and the through hole 18. In the present embodiment, the diameter (contact diameter) of the through hole 18 is smaller than the diameter of the through hole 17. Accordingly, the shape of the pixel electrode 16 is changed in accordance with the diameters of the through hole 17 and the through hole 18.

  Next, the effective voltage for each pixel in the liquid crystal display panel 2 will be described with reference to FIG.

  A voltage is applied to the liquid crystal 15 through the pixel electrode 16. With the above configuration, the resistance value between the pixel electrode 16 and the drain of the switching element in the blue pixel is larger than the resistance value between the pixel electrode 16 and the drain of the switching element in the green pixel. It has become. Therefore, when the same voltage is applied from the drive circuit to each pixel by the unified γ setting of RGB, the effective voltage applied to the liquid crystal 15 in the blue pixel is more than the effective voltage applied to the liquid crystal 15 in the green pixel. Can be small. Accordingly, it is possible to avoid gradation collapse in the blue pixel and to improve the overall transmittance combining the transmittances of red, green, and blue.

  As described above, in the liquid crystal display panel 2, the resistance value between the liquid crystal 15 and the drain of the switching element in each pixel differs depending on the color displayed by the pixel. Thereby, the effective voltage applied to the liquid crystal part corresponding to each pixel at the time of voltage application can be varied. That is, it is possible to apply a voltage that maximizes the transmittance of each color to the pixels of each color. The principle of this effect will be described next.

  Here, the relationship between the applied voltage and the light transmittance in the liquid crystal display panel 2 according to an embodiment of the present invention will be described below with reference to FIG.

  FIG. 3 is a graph showing the light transmittance 32 corresponding to the liquid crystal applied voltage 31. On the graph, the light transmittance 33 (hereinafter referred to as transmittance 33) in the red pixel, the light transmittance 34 (hereinafter referred to as transmittance 34) in the green pixel, and the light transmittance 35 (hereinafter referred to as “light transmittance” in the blue pixel). , The transmittance 35) is indicated by a bold line.

  A double-headed arrow 39 just below the graph indicates a liquid crystal effective voltage setting range of the driver IC without independent γ setting.

  Three bi-directional arrows arranged under the bi-directional arrow 39 are applied in order from the top to the liquid crystal 15 corresponding to the blue pixel and the liquid crystal 15 corresponding to the green pixel. Voltage 41 (hereinafter, voltage 41) and voltage 42 (hereinafter, voltage 42) applied to the liquid crystal 15 corresponding to the red pixel. At this time, the voltage 40 is a voltage at which the transmittance 35 is maximum, and is smaller than the voltage 41. The voltage 41 is the maximum value of the voltage applied by the driver IC. The voltage at which the transmittance 33 is maximized is greater than the voltage 41, but the value of the voltage 42 is equal to the value of the maximum voltage 41 due to the setting of the driver IC.

  The sum of the transmittances 33, 34, and 35 (white transmittance 38) when the voltage 41 is applied to the liquid crystal 15 corresponding to each of the red, green, and blue pixels is indicated by a broken line.

  An arrow 37 indicates an improvement in the transmittance 35 when the voltage 41 is changed to the voltage 40. At this time, the sum of the transmittances 33, 34 and 35 (white transmittance 36) is indicated by a thick line on the graph.

  As shown by the transmittances 33, 34, and 35, the voltage at which the light transmittance is maximized is different depending on each color. For example, the voltage at which the transmittance 34 is maximum is the voltage 41. However, at the same voltage, the transmittance 35 is low, and gradation collapse occurs in blue pixels.

  Therefore, as in the present embodiment, only the voltage applied to the liquid crystal 15 corresponding to the blue pixel is made smaller than the voltage applied to the liquid crystal 15 corresponding to the green pixel. That is, the voltage 40 is applied instead of the voltage 41. As a result, the transmittance 35 is maximized, and gradation collapse in the blue pixel is avoided. As a result, the white transmittance 36 is also improved as compared with the white transmittance 38 when the voltage 41 is applied. Note that a red pixel (that is, a pixel including a red color filter) may have a structure similar to that of a green pixel.

  As described above, the liquid crystal display panel 2 has an effect of avoiding gradation collapse in each pixel and improving the transmittance of the entire pixel included in the liquid crystal display panel. Further, such an effect can be realized without requiring a dedicated driver IC. Furthermore, this effect (improvement of optical characteristics) is equivalent to correction processing (RGB independent γ setting) using a dedicated driver IC. That is, liquid crystal transmittance can be improved, NTSC ratio can be improved, chromaticity coordinates can be corrected, and cell thickness unevenness can be suppressed.

  Here, color unevenness control due to cell thickness unevenness in the liquid crystal display panel 2 will be supplemented below with reference to FIG.

  FIG. 4 is a graph showing the white chromaticity coordinate shift amount 44 corresponding to the light transmittance 43 when the cell thickness varies. On the graph, white chromaticity coordinate shift amount 45 when the voltage applied to all the RGB cells is simultaneously reduced, and white chromaticity coordinate shift amount 46 when the voltage applied to the B cell is lowered. Are indicated by bold arrows.

  As shown in FIG. 4, in the liquid crystal display panel 2, as shown in the white chromaticity coordinate shift amount 45 and the white chromaticity coordinate shift amount 46, B is higher than when the same voltage is applied to all the RGB cells. When a small voltage is applied only to these cells, white chromaticity coordinate shift amount (that is, white cell thickness unevenness) can be controlled while suppressing a decrease in transmittance.

[Embodiment 2]
A second embodiment of the liquid crystal display device according to the present invention will be described below with reference to FIG. In addition, the same number is attached | subjected to the member which is common in the member concerning 1st Embodiment, and detailed description is abbreviate | omitted.

  First, the configuration of the liquid crystal display panel 2a will be described below with reference to FIG.

  FIG. 5 is a cross-sectional view of the liquid crystal display panel 2a according to the present embodiment. As shown in FIG. 5, the liquid crystal display panel 2a includes a color filter substrate 10, a black matrix 11, color filters 12, 13, a common electrode 14, a liquid crystal 15, a pixel electrode 16, a pixel electrode 53, through holes 17, 18, and a source. An electrode 19, a transparent insulating film 20, an interlayer insulating film 21, a TFT substrate 22, an auxiliary capacitor 23, and a gate bus line 24 are provided.

  As shown in FIG. 5, the configuration of the liquid crystal display panel 2 a is almost the same as the configuration of the liquid crystal display panel 2. A different point is a pixel electrode corresponding to the pixel of the through hole 18 and the color filter 13. The diameter of the through hole 18 is equal to the diameter of the through hole 17. On the other hand, the blue pixel has a pixel electrode 53 formed of a film different from the pixel electrode 16. In the present embodiment, the material of the pixel electrode 16 is ITO, but the material of the pixel electrode 53 is a-ITO. a-ITO has a higher resistance than ITO and has a different contact resistance. Note that when forming the pixel electrode, the pixel electrode is changed to the color of the pixel if at least one of the constituent material of the film, the amount of the additive, the type of the additive, and the film forming atmosphere is changed according to the color of the pixel. It can be formed by a suitable film.

  Next, the effective voltage for each pixel in the liquid crystal display panel 2a will be described with reference to FIG.

  In the liquid crystal display panel 2 a, a voltage is applied to the liquid crystal 15 in the blue pixel through the pixel electrode 53. On the other hand, a voltage is applied to the liquid crystal 15 in the green pixel through the pixel electrode 16. Here, in the liquid crystal display panel 2 a, the resistance of the pixel electrode 53 is higher than that of the pixel electrode 16. Therefore, as in the first embodiment, the effective voltage applied to the blue pixel can be made smaller than the effective voltage applied to the green pixel. Accordingly, it is possible to avoid gradation collapse in the blue pixel and to improve the overall transmittance combining the transmittances of red, green, and blue. Note that a red pixel (that is, a pixel including a red color filter) may have a structure similar to that of a green pixel.

[Embodiment 3]
A third embodiment of the liquid crystal display device according to the present invention will be described below with reference to FIGS. In addition, the same number is attached | subjected to the member which is common in the member concerning 1st or 2nd embodiment, and detailed description is abbreviate | omitted.

  First, the resistance provided in the liquid crystal display panel 2b will be described below with reference to FIG.

  FIG. 6 is an electric circuit diagram when a resistor is formed between the pixel electrode 16 and the TFT 61 (switching element) of the liquid crystal display panel 2b according to the present embodiment. As shown in this figure, the source bus line 60 intersects two lines. One is a gate bus line 24. A TFT 61 is installed at a position intersecting with the gate bus line 24. A resistor 62 is formed between the drain of the TFT 61 and the pixel electrode 16. Another line intersecting the source bus line 60 is an auxiliary capacity bus line 63. An auxiliary capacitor 64 and an auxiliary capacitor 65 are formed in parallel on the auxiliary capacitor bus line 63.

  Next, the configuration of the liquid crystal display panel 2b will be described below with reference to FIG.

  FIG. 7 is a cross-sectional view of the liquid crystal display panel 2b according to this embodiment. As shown in FIG. 7, the liquid crystal display panel 2b includes a color filter substrate 10, a black matrix 11, color filters 12 and 13, a common electrode 14, a liquid crystal 15, a pixel electrode 16, through holes 17 and 18, a source electrode 19, and a transparent electrode. An insulating film 20, an interlayer insulating film 21, a TFT substrate 22, an auxiliary capacitor 23, a gate bus line 24, and a resistor 62 are provided.

  As shown in FIG. 7, the configuration of the liquid crystal display panel 2 b is almost the same as the configuration of the liquid crystal display panel 2. A different point is a through hole 18 and a resistor 62 formed between the pixel electrode 16 and the source electrode 19. The diameter of the through hole 18 is equal to the diameter of the through hole 17.

  Next, the effective voltage for each pixel in the liquid crystal display panel 2b will be described with reference to FIG.

  In the liquid crystal display panel 2b, a voltage is applied to the liquid crystal 15 in the blue pixel and the liquid crystal 15 in the green pixel through the pixel electrode 16. Here, in the liquid crystal display panel 2b, the resistance between the pixel electrode 16 and the drain (or source electrode 19) in the blue pixel is between the pixel electrode 16 and the drain (or source electrode 19) in the green pixel. It is higher than the resistance. Therefore, as in the first embodiment, the voltage applied to the blue pixel can be further reduced. Accordingly, it is possible to avoid gradation collapse in the blue pixel and to improve the overall transmittance combining the transmittances of red, green, and blue. Note that a red pixel (that is, a pixel including a red color filter) may have a structure similar to that of a green pixel.

[Embodiment 4]
A fourth embodiment of the liquid crystal display device according to the present invention will be described below with reference to FIG. In addition, the same number is attached | subjected to the member which is common in the member concerning at least one of the 1st to 3rd embodiment, and detailed description is abbreviate | omitted.

  First, the configuration of the liquid crystal display panel 2c will be described below with reference to FIG.

  FIG. 8 is a cross-sectional view of the liquid crystal display panel 2c according to this embodiment. As shown in FIG. 8, the liquid crystal display panel 2c includes the color filter substrate 10, the black matrix 11, the color filters 12, 13, the common electrode 14, the hole 80, the liquid crystal 15, the pixel electrode 16, the through holes 17, 18, and the source electrode. 19, a transparent insulating film 20, an interlayer insulating film 21, a TFT substrate 22, an auxiliary capacitor 23, and a gate bus line 24.

  As shown in FIG. 8, the configuration of the liquid crystal display panel 2 c is almost the same as the configuration of the liquid crystal display panel 2. The difference is the common electrode 14 formed on the through hole 18 and the color filter 13. A hole 80 is formed in the common electrode 14. The diameter of the through hole 18 is equal to the diameter of the through hole 17.

  Next, the effective voltage of each pixel in the liquid crystal display panel 2c will be described with reference to FIG.

  In the liquid crystal display panel 2c, a voltage is applied through the common electrode 14 to the liquid crystal 15 in the blue pixel and the liquid crystal 15 in the green pixel. Here, in the liquid crystal display panel 2c, a hole 80 is formed in the common electrode 14 corresponding to the blue pixel. Since the holes 80 are formed in the common electrode 14 as described above, the area of the portion where the common electrode 14 is in contact with the liquid crystal differs depending on the color displayed by the pixel. As a result, the resistance between the common electrode 14 and the drain (or source electrode 19) in the blue pixel is higher than the resistance between the common electrode 14 and the drain (or source electrode 19) in the green pixel. Yes. Therefore, similarly to the first embodiment, the voltage applied to the blue pixel can be reduced. Accordingly, it is possible to avoid gradation collapse in the blue pixel and to improve the overall transmittance combining the transmittances of red, green, and blue. Note that a red pixel (that is, a pixel including a red color filter) may have a structure similar to that of a green pixel.

[Embodiment 5]
A fifth embodiment of the liquid crystal display device according to the present invention will be described below with reference to FIGS. 9 and 10. FIG. In addition, the same number is attached | subjected to the member which is common in the member concerning at least 1st-4th embodiment, and detailed description is abbreviate | omitted.

  First, the capacity provided in the liquid crystal display panel 2d will be described below with reference to FIG.

  FIG. 9 is an electric circuit diagram when a capacitor is formed between the pixel electrode 16 and the TFT 61 of the liquid crystal display panel 2d according to the present embodiment.

  As shown in FIG. 9, the source bus line 60 intersects with two lines. One is a gate bus line 24. A TFT 61 is installed at a position intersecting with the gate bus line 24. A distance is provided between the drain of the TFT 61 and the pixel electrode 16 to form a capacitor 90. Another line intersecting the source bus line 60 is an auxiliary capacity bus line 63. An auxiliary capacitor 64 and an auxiliary capacitor 65 are formed in parallel on the auxiliary capacitor bus line 63.

  Next, the configuration of the liquid crystal display panel 2d will be described below with reference to FIG.

  FIG. 10 is a cross-sectional view of the liquid crystal display panel 2d according to this embodiment. As shown in FIG. 10, the liquid crystal display panel 2d includes a color filter substrate 10, a black matrix 11, color filters 12, 13, a common electrode 14, a liquid crystal 15, a pixel electrode 16, through holes 17, 18, a source electrode 19, and a transparent electrode. An insulating film 20, an interlayer insulating film 21, a TFT substrate 22, an auxiliary capacitor 23, a gate bus line 24, and a capacitor 90 are provided.

  As shown in FIG. 10, the configuration of the liquid crystal display panel 2 d is substantially the same as the configuration of the liquid crystal display panel 2. The different points are the through hole 18 and the capacitor 90. The shape of the through hole 18 is different from that of the through hole 17, but the diameters are equal to each other. On the other hand, in the blue pixel, a capacitor 90 is further formed between the pixel electrode 16 and the drain. Such a capacitor 90 is not formed in the green pixel.

  Next, the effective voltage for each pixel in the liquid crystal display panel 2d will be described with reference to FIG.

  In the liquid crystal display panel 2d, a voltage is applied through the pixel electrode 16 to the liquid crystal 15 in the blue pixel and the liquid crystal 15 in the green pixel. Here, in the liquid crystal display panel 2d, the capacitance value between the pixel electrode 16 and the drain (or source electrode 19) in the blue pixel is the same as that between the pixel electrode 16 and the drain (or source electrode 19) in the green pixel. Greater than the value of the capacity between. Therefore, as in the first embodiment, the effective voltage applied to the blue pixel can be made smaller than the effective voltage of the green pixel. Accordingly, it is possible to avoid gradation collapse in the blue pixel and to improve the overall transmittance combining the transmittances of red, green, and blue. Note that a red pixel (that is, a pixel including a red color filter) may have a structure similar to that of a green pixel.

[Embodiment 6]
A sixth embodiment of the liquid crystal display device according to the present invention will be described below with reference to FIG. In addition, the same number is attached | subjected to the member which is common in the member concerning at least one of the 1st to 5th embodiment, and detailed description is abbreviate | omitted.

  First, the configuration of the liquid crystal display panel 2e will be described below with reference to FIG.

  FIG. 11 is a cross-sectional view of the liquid crystal display panel 2e according to this embodiment. As shown in FIG. 11, the liquid crystal display panel 2e includes a color filter substrate 10, a black matrix 11, color filters 12, 13, a common electrode 14, a liquid crystal 15, a pixel electrode 16, through-holes 17, 18, a source electrode 19, and a transparent electrode. An insulating film 20, an interlayer insulating film 21, a TFT substrate 22, an auxiliary capacitor 23, an auxiliary capacitor 110, and a gate bus line 24 are provided.

  As shown in FIG. 11, the configuration of the liquid crystal display panel 2 e is almost the same as the configuration of the liquid crystal display panel 2. The different points are the through hole 18 and the auxiliary capacitor 110. The diameter of the through hole 18 is equal to the diameter of the through hole 17. On the other hand, an auxiliary capacitor 110 smaller than the auxiliary capacitor 23 is formed on the TFT substrate 22 in the blue pixel.

  Next, the effective voltage for each pixel in the liquid crystal display panel 2e will be described with reference to FIG.

  In the liquid crystal display panel 2e, a voltage is applied through the pixel electrode 16 to the liquid crystal 15 in the blue pixel and the liquid crystal 15 in the green pixel. At this time, the liquid crystal display panel 2e is driven by direct current (DC drive). As a result, in addition to the voltage corresponding to the output from the driver, the voltage generated by the auxiliary capacitor due to the change in the effective voltage of the liquid crystal is also applied to each pixel of the liquid crystal display panel 2e. The value of the voltage generated by this auxiliary capacity is auxiliary capacity amplitude × (auxiliary capacity ÷ pixel capacity). Since the value of the auxiliary capacitor 110 in the blue pixel is smaller than the value of the auxiliary capacitor 16 in the green pixel, the total effective voltage applied to the blue pixel is smaller than the total effective voltage applied to the green pixel. it can. As a result, similar to the first embodiment, it is possible to avoid gradation collapse in the blue pixel and to improve the overall transmittance combining the transmittances of red, green, and blue. Note that a red pixel (that is, a pixel including a red color filter) may have a structure similar to that of a green pixel.

  The present invention is not limited to the above-described embodiments. Those skilled in the art can make various modifications to the present invention within the scope of the claims. That is, a new embodiment can be obtained by combining appropriately changed technical means within the scope of the claims.

  For example, the present invention is a liquid crystal display panel having a plurality of types of pixels that display different colors, and the resistance value between the pixel electrode and the common electrode in each pixel depends on the color displayed by the pixel. Any different liquid crystal display panel may be used. That is, the resistance value between the pixel electrode and the common electrode may be different depending on the color (red, blue, green) displayed by the pixel. Further, it is not always necessary that the resistance values are completely different from each other. For example, in each of the above-described embodiments, the resistance value between the pixel electrode and the common electrode in the green pixel is the same as that in the red pixel. It is equal to the resistance value between the common electrode. In other words, the resistance value between the pixel electrode and the common electrode in the pixel in which gradation collapse is prevented may be set to an appropriate value as appropriate.

  The present invention can be widely used as a liquid crystal display device having a plurality of types of pixels for displaying different colors. For example, it can be realized as an active matrix type liquid crystal display device.

1 is a configuration diagram of a liquid crystal display device and a liquid crystal display panel according to an embodiment of the present invention. It is sectional drawing of the liquid crystal display panel which concerns on one Embodiment of this invention. It is the graph which showed the transmittance | permeability of light corresponding to a liquid crystal applied voltage. It is the graph which showed the chromaticity coordinate shift amount of white when the cell thickness changes corresponding to the light transmittance. It is sectional drawing of the liquid crystal display panel which concerns on one Embodiment of this invention. It is an electric circuit diagram when resistance is formed between the pixel electrode and the drain of TFT. It is sectional drawing of the liquid crystal display panel which concerns on one Embodiment of this invention. It is sectional drawing of the liquid crystal display panel which concerns on one Embodiment of this invention. It is an electric circuit diagram when a capacitor is formed between the pixel electrode and the drain of the TFT. It is sectional drawing of the liquid crystal display panel which concerns on one Embodiment of this invention. It is sectional drawing of the liquid crystal display panel which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Liquid crystal display panel 10 Color filter substrate 11 Black matrix 12, 13 Color filter 14 Common electrode 15 Liquid crystal 16 Pixel electrode 17, 18 Through hole 19 Source electrode 20 Transparent insulating film 21 Interlayer insulating film 22 TFT substrate 23, 64 , 65, 110 Auxiliary capacitance 24 Gate bus line 53 Pixel electrode 60 Source bus line 61 TFT
62 Resistance 63 Auxiliary capacity bus line 80 holes 90 capacity

Claims (9)

A liquid crystal display panel having a plurality of pixels,
A liquid crystal display panel, wherein a resistance value between a liquid crystal and a drain of a switching element in the pixel differs depending on a color displayed by the pixel. A part of the pixel electrode in the pixel forms a through hole,
The liquid crystal display panel according to claim 1, wherein the diameter of the through hole is different depending on a color displayed by the pixel including the through hole.   The liquid crystal display panel according to claim 1, wherein the pixel electrode in the pixel is formed of a film having a different resistance value depending on a color displayed by the pixel. A liquid crystal display panel having a plurality of pixels,
The liquid crystal display panel, wherein the area of the portion of the pixel where the electrode is in contact with the liquid crystal is different depending on the color displayed by the pixel.   5. The liquid crystal display panel according to any one of 1 to 4, wherein a resistor is formed between the pixel electrode and the drain. A liquid crystal display panel having a plurality of pixels,
A liquid crystal display panel, wherein a capacitance value between a liquid crystal and a drain of a switching element in the pixel differs depending on a color displayed by the pixel.   The liquid crystal display panel according to claim 6, wherein a distance between the pixel electrode and the drain in the pixel is different according to a color displayed by the pixel. A liquid crystal display panel having a plurality of pixels,
The liquid crystal is characterized in that the value of the auxiliary capacitance in the pixel differs depending on the color displayed by the pixel, and driving is performed to change the potential difference between the common electrode and the pixel electrode by induction by coupling of the capacitance. Display panel.   A liquid crystal display device comprising the liquid crystal display panel according to claim 1.

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