JP5294667B2 - Liquid crystal display - Google Patents

Description

  The present invention relates to a backlight using a light emitting diode and a liquid crystal display device using a liquid crystal panel.

  With the recent improvement in light emission efficiency of light emitting diodes, the light sources of various illumination devices are replaced with light emitting diodes from lamps and fluorescent lamps. This is due to the fact that the light-emitting diode itself is small, can be multicolored, is easy to control, has high luminous efficiency, and has low power consumption. Therefore, in recent years, it has begun to be used for backlights of liquid crystal displays that require particularly high efficiency. It is well known that, for example, a white light emitting diode is used as a backlight of a liquid crystal display such as a cellular phone.

In addition, not only the luminous efficiency but also the color reproduction range has become an important specification for displays.In recent years, for example, the ratio of red and blue in the pixel area has been increased compared to green to achieve good color display. (For example, refer to Patent Document 1).
JP 2003-202580 A

However, in the liquid crystal display device, a request I'm on the use of high emission efficiency LED as a backlight, but the efficiency is possible to provide a good display device, generally color temperature is low, a high quality It is not suitable for the display. In Patent Document 1, although color reproduction is disclosed, no consideration is given to a pixel of a backlight or a liquid crystal panel.

  An object of the present invention is to provide a liquid crystal display device with high efficiency and high image quality.

In order to achieve the object of the present invention, a liquid crystal display device of the present invention includes a liquid crystal panel having pixels that transmit red, green, and blue wavelength regions, and a liquid crystal having a backlight that includes a light emitting diode light source that emits white light. In the display device,
Red of the liquid crystal panel, green, area of each pixel of the blue, the red, green, color on 6800K than defined with respect to the color displayed when applying the same signal voltage to the electrodes of each pixel of the blue It is determined based on the temperature value,
The capacitance ratio between the capacitance line and the pixel electrode of each of the red, green, and blue pixels is Rc: Gc: Bc, and the area ratio of each of the red, green, and blue pixels is Rs: Gs: Bs,
The capacitance ratio Rc represents the capacitance of the pixel with the smallest capacitance among the red, green, and blue pixels and the area of the pixel with the smallest area among the red, green, and blue pixels. : Gc: Bc and the area ratio Rs: Gs: Bs is set to 1 as a reference value,
In the liquid crystal display device, the difference between the maximum value of Rc, Gc, and Bc and the reference value is smaller than the difference between the maximum value of Rs, Gs, and Bs and the reference value.

  The interval between the electrodes or wirings forming the capacitance is the same for the red, green, and blue pixels, and the size relationship between the areas of the red, green, and blue pixels and the size relationship between the electrodes or wirings that form the capacitance are as follows. The reverse is true.

The area of each of the red, green, and blue pixels is such that when the same signal voltage for white display is applied to the electrodes of the red, green, and blue pixels, the color temperature is higher than the color temperature of the backlight. the area ratio becomes Rs: Gs: that is formed by Bs.

  The red, green, and blue pixels have the same length in the data line direction and different lengths in the gate line direction.

  The red, green and blue pixels have different lengths in the data line direction and the same length in the gate line direction.

  The light emitting diode light source that emits white light includes a light emitting diode having a peak in a blue region and a phosphor having a yellow light emitting peak excited by the light emitting diode.

  The white light emitting diode light source includes a phosphor having red and green emission peaks when excited with a light emitting diode having a peak in the blue region.

  The white light-emitting diode light source is a light-emitting diode having peaks in red, green, and blue regions.

A color filter for each pixel of red, green, and blue, wherein the size relationship of the area of each pixel of red, green, and blue is a peak of transmittance in the visible light region of the color filter of each pixel of red, green, and blue This is the opposite of the magnitude relationship.

  The film thicknesses of the color filters of the red, green, and blue pixels are different, and the magnitude relationship between the thicknesses is opposite to the magnitude relationship between the transmittance peaks.

  The density of the color filters of the red, green, and blue pixels is different, and the magnitude relationship between the densities is opposite to the magnitude relationship between the transmittance peaks.

  The liquid crystal display mode of the liquid crystal panel is driven by a vertical electric field.

  The liquid crystal display mode of the liquid crystal panel is driven by a horizontal electric field.

  The light emitting diode light source is disposed in a plane in which the backlight is parallel to the liquid crystal panel.

  The backlight includes a light guide plate, and the light emitting diode light source is disposed on a side portion of the light guide plate.

  A plurality of backlights having the light guide plate are arranged in a tile shape.

  According to the present invention, a liquid crystal display device with high efficiency and high image quality can be provided.

  Hereinafter, embodiments of a lighting device and a display device using the lighting device according to the present invention will be described in detail with reference to the drawings.

[Example 1]
1 to 7 show a first embodiment of a liquid crystal display device according to the present invention.

  1 to 7 are diagrams for explaining a first embodiment of a liquid crystal display device according to the present invention. FIG. 1 is an exploded perspective view of the liquid crystal display device of the present invention, and FIG. 3 is a sectional view of a light emitting diode package used for a light, FIG. 3 is an emission spectrum of a light emitting diode emitting white light used for a backlight of the present invention, FIG. 4 is a plan view of a color filter substrate of the present invention, and FIG. FIG. 6 is a plan view of the TFT substrate of the present invention, and FIG. 7 is a drive circuit diagram of the liquid crystal panel of the present invention.

  The liquid crystal display device according to the present invention has a liquid crystal panel 100 and a backlight 90 as shown in FIG. The backlight 90 includes a plurality of light emitting diode packages 91 and an optical member group 97.

  As shown in FIG. 2, each light emitting diode package of the plurality of light emitting diode packages 91 includes a package composed of a white resin 92 and a lead frame 93, and a light emitting diode 95 is mounted on the package. The periphery of the light emitting diode 95 is covered with a phosphor 96, and the periphery of the phosphor 96 is sealed with a transparent resin 94.

  The light emitting diode 95 emits light in a blue wavelength region, that is, 430 nm to 480 nm, and a part of the light emitted from the light emitting diode 95 excites the phosphor 96 and is converted into yellow light, and part of the light is emitted. The fluorescent substance 96 is transmitted. The light emitting diode package 95 emits white light by mixing blue light that has passed through the phosphor 96 and yellow light that has excited the phosphor 96. The emission spectrum at this time is as shown in FIG. 3A, and has blue and yellow peaks.

  The optical member group 97 controls light using a diffusion sheet, a diffusion plate, a prism sheet, a lenticular sheet, a polarization reflection plate, and the like. Therefore, the optical member group 97 controls the uniformity, brightness, directivity, polarization degree, and the like of the light emitted from each light emitting diode package 91. Thus, the light emitted from each light emitting diode package 91 is incident on the liquid crystal panel 100 after the optical member group 97 controls uniformity, brightness, directivity, polarization degree, and the like. As the optical member group 97, a sheet in which these function controls are integrated may be used.

  The liquid crystal panel 100 includes a color filter substrate and a thin film transistor (TFT) substrate, and a liquid crystal material is sealed between them. A plan view of red, green and blue pixels of the color filter substrate of the liquid crystal panel 100 is shown in FIG. In FIG. 4, red pixels R, green pixels G, and blue pixels B having different areas are arranged side by side. The arrangement of the red pixel R, the green pixel G, and the blue pixel B having different areas is periodically repeated on the color filter substrate.

  Further, the color filter substrate of the liquid crystal panel 100 has a common electrode (not shown), which is a so-called vertical electric field method driven by an electric field between pixel electrodes of a TFT substrate described later. The transmission spectra of the red, green and blue color filters at this time are as shown in FIG.

  On the other hand, the red, green and blue pixels of the TFT substrate are arranged facing the color filter substrate of the liquid crystal panel 100. A plan view of the red, green and blue pixels of this TFT substrate is shown in FIG.

  In FIG. 6, the red pixel electrode 1R, the green pixel electrode 1G, and the blue pixel electrode 1B of the TFT substrate are periodically arranged side by side, and the red pixel electrode 1R, the green pixel electrode 1G, and the blue pixel electrode 1B A gate wiring 2 and a signal wiring 3 are connected to each pixel electrode of the pixel electrode 1B through a thin film transistor 5. Capacitor wirings 41 are disposed under the pixel electrodes of the red pixel electrode 1R, the green pixel electrode 1G, and the blue pixel electrode 1B. A capacitor 4 (fine broken line portion) is formed between each pixel electrode and the capacitor wiring 41.

  The capacitor wiring 41 is formed of a transparent material such as ITO or a metal, but the transparent material is more preferable from the viewpoint of transmittance. The capacitor 4 may be formed between the gate line 2 and each pixel electrode of the red pixel electrode 1R, the green pixel electrode 1G, and the blue pixel electrode 1B. Also, the large broken line shown in FIG. 6 corresponds to the pixel boundary shown in FIG. 4, and the gate wiring 2, signal wiring 3 and TFT 5 are shielded from light by the black matrix BM.

  FIG. 7 shows a drive circuit for the liquid crystal panel 100 according to the present invention. A vertical scanning circuit 21 is connected to the gate wiring 2 connected to each pixel electrode of the red pixel electrode 1R, the green pixel electrode 1G, and the blue pixel electrode 1B of the TFT substrate. Further, a video signal circuit 31 is connected to the signal wiring 3 connected to each of the red pixel electrode 1R, the green pixel electrode 1G, and the blue pixel electrode 1B of the TFT substrate. When the scanning signal voltage is applied to the vertical scanning circuit 21, the video signal voltage is applied to the video signal circuit 31, and the timing signal is supplied, the liquid crystal panel 10 performs active matrix driving using a thin film transistor. As a result, a predetermined voltage is applied to the pixel electrodes of the red pixel electrode 1R, the green pixel electrode 1G, and the blue pixel electrode 1B of the liquid crystal panel 100, and is held by the capacitor 4 so that the light from the backlight for each pixel. The transmittance can be controlled, and an arbitrary image can be displayed.

  Hereinafter, the effect of the present invention will be described using a comparison between this embodiment and a conventional liquid crystal display device using a white light emitting diode and a liquid crystal panel having the same red, green, and blue areas.

As shown in FIG. 8, C light source (x, y) = (0.310, 0.316) and color temperature 6800K are used as one reference for the white chromaticity coordinates. However, for example, a color temperature required for white display on a television where high image quality is important is 9000K or 12000K, and a higher color temperature is required. For example, when the white light emitting diode shown in FIG. 3 is used as the light source of the backlight, the white chromaticity coordinate of the liquid crystal display device is (x, y) = (0.297, 0.337), and the color temperature in a 7300K and tables current. For high image quality, it is necessary to increase the color temperature.

[Conventional liquid crystal display]
In a conventional liquid crystal display device, in order to realize white display of these color temperatures, it is possible to cope with this by controlling the transmittance of each pixel of red, green, and blue. For example, if the maximum transmittance of each pixel is 1, in order to match 9000K, the R pixel is 0.92, the G pixel is 0.70, and the B pixel is 1. Further, in order to realize white at a color temperature of 12000K, it is necessary that the R pixel is 0.74, the G pixel is 0.56, and the B pixel is 1. That is, in order to match the color temperature, it is necessary to reduce the transmittance of the red and green pixels. If the total use efficiency at the time of 7300K before the combination is set to 100, it becomes 78 for 9000K and 66 for 12000K.

[Liquid Crystal Display Device of the Present Invention]
On the other hand, the liquid crystal display device of the present invention does not control the transmittance of each pixel of red, green, and blue, but changes the area of each pixel of red, green, and blue to realize a color temperature of 9000K or 12000K. ing. In the case of 9000K, it can be realized by setting the pixel area ratio of red, green, and blue to 1.33: 1.00: 1.44. In the case of 12000K, it can be realized by setting the pixel area ratio of each pixel of red, green, and blue to 1.33: 1.00: 1.79. As with the conventional liquid crystal display device, assuming that the total utilization efficiency at 7300K is 100, the total utilization efficiency at 9000K is 90, and the total utilization efficiency at 86 is 12000K.

From the above, comparing the liquid crystal display device of a liquid crystal display device and the invention of the traditional time of 9000K is 1.1 times, during 12000K has high 1.3 times more efficient, compared to the liquid crystal display device of the traditional Thus, the present invention can provide a liquid crystal display device with high efficiency and high image quality. In the present invention, for example, when a liquid crystal display device manufactured at a color temperature of 9000K is to be viewed at a color temperature of 10000K, the transmittance of each pixel of red, green, and blue is controlled (dropped). The temperature will be adjusted. However, it goes without saying that the ratio is small compared to the amount of decrease in transmittance in order to adjust the conventional liquid crystal display device with a color temperature of 7300K to 10000K.

  Similarly, when a combined white light source for exciting phosphors having red and green peaks with a blue light emitting diode as shown in FIG. 3B is formed, the effect of the present invention is similarly obtained. For example, in the case of the combination with the red and green phosphors in FIG. 3B, at a color temperature of 9000K, the pixel area ratio is 1.06: 1.00: 1.27, the efficiency is 1.2, and the color temperature is 12000K. In this case, the pixel area ratio is 1.00: 1.02: 1.51, and the efficiency is 1.3.

  Other than this, a white light source that emits red, green, and blue phosphors with an ultraviolet LED, a white light source that emits red, green, and blue light-emitting diodes, a white light source that combines two-color light emitting diodes and phosphors, etc. But it goes without saying that it has the same effect.

  As described above, in the liquid crystal display device of the present invention, in particular, a light emitting diode light source that emits white light having the spectrum shown in FIG. 3 is used as the light source, and the red, green, and red colors shown in FIGS. Since panels with different blue pixel areas are used, light incident on the liquid crystal panel from a backlight using a light emitting diode as a light source can be used efficiently, and a high-quality liquid crystal display device having a high color temperature can be provided.

[Example 2]
FIG. 9 shows a second embodiment of the liquid crystal display device according to the present invention. FIG. 9 is a diagram for explaining a second embodiment of the liquid crystal display device according to the present invention, and shows a plan view of the TFT substrate of the present invention. Here, differences from the first embodiment will be described.

In the liquid crystal display device of the present invention, as shown in FIG. 9 , the capacitance line 41 has a capacitance 4 at a portion where it overlaps with each pixel electrode of the red pixel electrode 1R, green pixel electrode 1G, and blue pixel electrode 1B of the liquid crystal panel 100. Although formed, the width of the capacitor line of the pixel B having a large area is narrowed and the width of the capacitor line of the pixel G having a small area is widened, and the area ratio of the pixel capacitors is 1: 1: 1. Since the capacitance of the pixel is proportional to its area, the capacitance ratio Rc: Gc: Bc is also 1: 1: 1.

  The area ratio Rs: Gs: Bs of red, green, and blue pixels is, for example, 1.33: 1: 1.79 when the color temperature is 12000K. When the minimum value of the ratio is expressed as 1, the difference between the maximum value and the minimum value of the pixel area ratio is 0.79, whereas the difference of the capacitance ratio Rc: Gc: Bc is 0. The difference in capacity ratio Rc: Gc: Bc is smaller than the difference in area ratio Rs: Gs: Bs. In the present invention configured as described above, in addition to the above-described effects, by holding the capacitance when the area of the pixel is changed, the cause of flicker due to the difference in holding time of each pixel is reduced, and the image quality is reduced. There is an effect of improving. Here, an example in which the capacity ratio of the red, green, and blue pixels is 1: 1: 1 is shown. However, if the ratio difference is configured to be at least smaller than the area ratio, there is a difference in degree. An effect is obtained.

  Further, in the liquid crystal display device of the present invention, as described above, the difference in the capacitance ratio of the red, green, and blue pixels is smaller than the area ratio, in other words, because the capacitance is relatively uniform, the red, green, By applying the same signal voltage to the blue pixel electrodes, a white display can be provided. In addition, the driving can be simplified and the cost of the driving circuit can be reduced.

  Furthermore, in the liquid crystal display device of the present invention, as shown in FIG. 6, the lengths of the pixels in the direction of the data wiring 3 (vertical direction in the drawing) are equal, and the length in the direction of the gate line 2 (horizontal direction in the drawing) is changed. Each pixel area has a different configuration. For this reason, when the capacitance of the pixel is not changed, the pixel having a small pixel area is particularly susceptible to a change in voltage written to the data wiring. In the present invention, in addition to the above-described effects, the capacitance ratio is smaller than the area ratio, so that the parasitic capacitance with the gate wiring can be reduced while maintaining the capacitance. There is an effect that can be made.

  In addition, regarding the capacitance, the configuration in which the areas of the capacitance wirings are different for each of red, green, and blue is shown, but the distance between the electrodes (capacitor line and pixel electrode) that forms the capacitance while keeping the area constant. It is also possible to obtain the same effect as described above by changing the dielectric constant of the interlayer insulating film between the electrodes, or changing the capacitance by combining any one of the area, the interval, and the dielectric constant.

[Example 3]
10 to 12 show a third embodiment of the liquid crystal display device according to the present invention.

  10 to 12 are diagrams for explaining a third embodiment of the liquid crystal display device according to the present invention, FIG. 10 is an exploded perspective view of the liquid crystal display device of the present invention, and FIG. 11 is the liquid crystal of the present invention. FIG. 12 is a cross-sectional view of the display device, and a plan view of the TFT substrate of the present invention is shown. Here, differences from the first and second embodiments will be described.

  The liquid crystal display device according to the present invention includes a liquid crystal panel 100 and a backlight 90 as shown in FIG. The backlight 90 includes a light source module 93 on which a plurality of light emitting diode packages or light emitting diodes are mounted, a light guide plate 94, and an optical member group 97. Light from the light source module 93 travels while repeating total reflection in the light guide plate 94, is scattered by a dot pattern formed on the light guide plate 94, and is irradiated onto the liquid crystal panel 100 through the optical member group 97 on the upper surface. Subsequent light travel is the same as in the previous embodiment.

  In the present embodiment, the configuration in which the light emitting diode module is arranged on one side is shown, but the configuration (not shown) in which the light emitting diode module is arranged on both sides may be used. Furthermore, as shown in FIG. 11, a plurality of backlights may be attached in a tile shape.

  The liquid crystal panel 100 of the present invention is a so-called lateral electric field system in which electrodes are arranged in a comb-like pixel electrode and a common electrode. FIG. 12 shows a plan view of red and green pixels of the TFT substrate. A gate wiring 2 and a signal wiring 3 are connected via a thin film transistor 5 to the pixel electrode 1 on the comb teeth of each pixel of red, green and blue. Further, a comb-like common electrode 6 is disposed between the pixel electrodes 1. The liquid crystal is driven by a lateral electric field generated between the pixel electrodes 1R, 1G, and 1B and the common electrode 6, and an arbitrary image can be displayed. Here, the capacitance is formed by the overlapping portion of the pixel electrode 1 and the common electrode 6.

  Also in this embodiment, the areas of red, blue and green pixels are different. By changing the area ratio and the capacitance ratio of the pixels as described above, the same effect as in the above-described embodiment can be obtained. In general, a side-type backlight in which light from a light-emitting diode light source module is incident on the light guide plate has an advantage that it can be thinned, but a light incident loss on the light guide plate is large. Furthermore, since the location of the light source is limited to the side surface of the light guide plate, the number of light emitting diode light sources that can be arranged is also limited, and thus the image of the liquid crystal display device tends to be dark. However, since the present invention is characterized by high image quality and high light utilization efficiency as described above, it is also suitable for a liquid crystal display device having a backlight having these light guide plates and can provide a thinner liquid crystal display device. .

[Example 4]
13 and 14 show a fourth embodiment of the liquid crystal display device according to the present invention.

  FIGS. 13 and 14 are diagrams for explaining a fourth embodiment of the liquid crystal display device according to the present invention. FIG. 13 is a sectional view and a plan view of the TFT substrate of the present invention. FIG. A plan view of the color filter substrate is shown. Here, differences from the first, second, and third embodiments will be described.

The liquid crystal display device according to the present invention uses a horizontal electric field type liquid crystal panel in which a pixel electrode 1 is formed on a solid common electrode 6 via an insulating layer 7 as shown in a cross-sectional view and a plan view of FIG. Liquid crystal display device. In this embodiment, the capacitor 4 is formed by an overlapping portion of the pixel electrode 1 and the common electrode 6 made of a transparent conductive material through an insulating film 7. Therefore, by expanding a part of the upper pixel electrode 1 (the right comb tooth in FIG. 13B), the capacitance is increased, and the capacitance ratio of each pixel of red, green, and blue is Rc: Gc: Bc, red When the area ratio of each pixel of green and blue is Rs: Gs: Bs, and the minimum value of the capacity ratio and area ratio is 1, the difference between the maximum value and the minimum value of Rc, Gc, Bc is By adopting a configuration that is smaller than the difference between the maximum value and the minimum value of Rs, Gs, and Bs, the same effect as in the above-described embodiment can be obtained.

  At this time, as shown in FIG. 14, on the color filter substrate side of the liquid crystal panel, a portion that does not contribute to the display of the pixel electrode 1 may be shielded by a black matrix. By doing this, the aperture ratio decreases, but if the aperture ratio falls within the range of the above-described extraction efficiency improvement, a conventional example in which the maximum transmittance (maximum gradation) of red, green, and blue is reduced. In contrast, a display device with high efficiency and high image quality can be provided. Further, at this time, as shown in FIG. 14, the lengths of the red, green, and blue pixels in the data line direction are made different, and the lengths of the pixels in the gate wiring direction (left and right direction in the figure) are made equal. The influence of the voltage displacement from the signal wiring to the small pixel can be reduced.

[Example 5]
15 and 16 show a fifth embodiment of the liquid crystal display device according to the present invention.

  15 and 16 are diagrams for explaining a fifth embodiment of the liquid crystal display device according to the present invention. FIG. 15 shows the transmittance of the color filter of the present invention. FIG. 16 shows the liquid crystal display device and the backlight. The chromaticity coordinates are shown. Here, differences from the above-described first to fourth embodiments will be described.

The liquid crystal display device according to the present invention uses a horizontal electric field type liquid crystal panel in which a pixel electrode 1 is formed on a solid common electrode 6 via an insulating layer 7 as shown in a cross-sectional view and a plan view of FIG. Liquid crystal display device. In this embodiment, the capacitor 4 has the same spectrum of the light source of the pixel electrode backlight as that shown in FIG. 3A. At this time, the color temperature is 7300 K, while the maximum gradation of the liquid crystal display device is used. The color temperature of all white is 12000K, and the color temperature of the light source is lower than the color temperature of the liquid crystal display device. Further, as shown in FIG. 15, the transmittance of the color filter is 90% in the peak of transmittance in the red (600-650 nm), green (510-570 nm), and blue (420-480 nm) regions. 68%, 57%, and red>green> blue. These transmittances can be realized by increasing the pigment or dye of the color filter shown in FIG. 5 and / or increasing the film thickness. For example, the density or the film of the red, green, and blue color filters can be realized. The thickness is obtained when the thickness is 1 time, 1.7 times, and 2 times, respectively.

On the other hand, the area ratio of the pixels of the present invention is R: G : B = 0.76: 0.9: 1.34, and there is a relationship of red <green <blue. The color reproduction range of the liquid crystal display device of the present invention is shown by the solid line in FIG. 16, and the EBU ratio is 110%. Comparing the efficiency with the case of performing red, green, and blue pixels with 12,000K in the same color reproduction range without changing the area of the color filter, the efficiency is 1.33 times, and the efficiency is high as in the previous examples.

  As described above, when the color temperature of the light source is lower than the color temperature displayed on the liquid crystal and the transmittance relationship of the red, green, and blue pixels is opposite to the size relationship of the areas, the above-described effect is obtained. In addition, it is possible to provide a high-quality liquid crystal display device having a wider color reproduction range than conventional ones.

It is a disassembled perspective view explaining the liquid crystal display device of Example 1 of this invention. It is sectional drawing explaining the light emitting diode package used for the backlight of the liquid crystal display device of Example 1 of this invention. It is a figure explaining the emission spectrum of the light emitting diode used for the backlight of the liquid crystal display device of Example 1 of this invention. It is a top view explaining the color filter board | substrate of the liquid crystal display device of Example 1 of this invention. It is a figure explaining the transmittance | permeability of the color filter of the liquid crystal display device of Example 1 of this invention. It is a top view explaining the TFT substrate pixel of the liquid crystal display device of Example 1 of this invention. It is a figure explaining the drive circuit of the liquid crystal display device of Example 1 of this invention. It is a figure explaining the white chromaticity coordinate of the liquid crystal display device of Example 1 of this invention. It is a top view explaining the color filter board | substrate of the liquid crystal display device of Example 2 of this invention. It is a disassembled perspective view explaining the liquid crystal display device of Example 3 of this invention. It is a disassembled perspective view explaining the liquid crystal display device of Example 3 of this invention. It is a top view explaining the TFT substrate pixel of the liquid crystal display device of Example 3 of this invention. It is sectional drawing and a top view explaining the TFT substrate pixel of the liquid crystal display device of Example 4 of this invention. It is a top view explaining the color filter board | substrate of the liquid crystal display device of Example 5 of this invention. It is a figure explaining the transmittance | permeability of the color filter of Example 6 of this invention. It is a figure explaining the chromaticity coordinate of the liquid crystal display device of Example 6 of this invention.

Explanation of symbols

1, 1R, 1G, 1B …………… Pixel electrode 2 …………………………………… Gate wiring 3 …………………………………… Signal wiring 41 …………………………………… Capacitance wiring 5 …………………………………… Thin film transistor (TFT)
6 …………………………………… Common electrode 90 ………………………………… Backlight 92 …………………………………… Optical member group 94 ……………………………… Lightguide plate 100 ……………………………… Liquid crystal panel R, G, B ………………………… Pixel BM …… …………………………… Black Matrix

Claims (16)

In a liquid crystal panel having pixels that transmit red, green, and blue wavelength regions, and a liquid crystal display device having a backlight that includes a light emitting diode light source that emits white light.
Red of the liquid crystal panel, green, area of each pixel of the blue, the red, green, color on 6800K than defined with respect to the color displayed when applying the same signal voltage to the electrodes of each pixel of the blue It is determined based on the temperature value,
The capacitance ratio between the capacitance line and the pixel electrode of each of the red, green, and blue pixels is Rc: Gc: Bc, and the area ratio of each of the red, green, and blue pixels is Rs: Gs: Bs,
The capacitance ratio Rc represents the capacitance of the pixel with the smallest capacitance among the red, green, and blue pixels and the area of the pixel with the smallest area among the red, green, and blue pixels. : Gc: Bc and the area ratio Rs: Gs: Bs is set to 1 as a reference value,
A liquid crystal display device, wherein a difference between a maximum value of Rc, Gc, and Bc and the reference value is smaller than a difference between the maximum value of Rs, Gs, and Bs and the reference value.   The interval between the electrodes or wirings forming the capacitance is the same for the red, green, and blue pixels, and the size relationship between the areas of the red, green, and blue pixels and the size relationship between the electrodes or wirings that form the capacitance are as follows. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is reverse.   The area of each of the red, green, and blue pixels is such that when the same signal voltage for white display is applied to the electrodes of the red, green, and blue pixels, the color temperature is higher than the color temperature of the backlight. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is formed with an area ratio Rs: Gs: Bs.   4. The liquid crystal display device according to claim 1, wherein the red, green, and blue pixels have the same length in the data line direction and different lengths in the gate line direction.   4. The liquid crystal display device according to claim 1, wherein the red, green, and blue pixels have different lengths in the data line direction and equal lengths in the gate line direction.   The light emitting diode light source emitting white light has a light emitting diode having a peak in a blue region and a phosphor having a yellow light emitting peak excited by the light emitting diode. Or 5. The liquid crystal display device according to 5.   6. The white light emitting diode light source includes a phosphor having red and green emission peaks when excited with a light emitting diode having a peak in a blue region. Liquid crystal display device.   7. The liquid crystal display device according to claim 1, wherein the white light-emitting diode light source is a light-emitting diode having peaks in red, green, and blue regions. It further has a color filter for each pixel of red, green and blue,
2. The size relationship between the areas of the red, green, and blue pixels is opposite to the relationship between the transmittance peaks in the visible light region of the color filters of the red, green, and blue pixels. , 2, 3, 4, 5, 6, 7 or 8.   10. The liquid crystal display device according to claim 9, wherein film thicknesses of the color filters of the red, green, and blue pixels are different, and the magnitude relationship between the thicknesses is opposite to the magnitude relationship between the respective transmittance peaks. .   10. The liquid crystal display device according to claim 9, wherein the density of the color filter of each of the red, green, and blue pixels is different, and the magnitude relation of the density is opposite to the magnitude relation of the peak of each transmittance.   12. The liquid crystal display device according to claim 1, wherein the liquid crystal display mode of the liquid crystal panel is driven by a vertical electric field.   12. The liquid crystal display device according to claim 1, wherein the liquid crystal display mode of the liquid crystal panel is driven by a horizontal electric field.   The light-emitting diode light source is disposed in a plane parallel to the liquid crystal panel of the backlight, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 Or the liquid crystal display device of 13.   The said backlight has a light-guide plate, The said light-emitting-diode light source is arrange | positioned at the side part of the said light-guide plate, The 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 characterized by the above-mentioned. , 11, 12, or 13.   The liquid crystal display device according to claim 15, wherein a plurality of backlights having the light guide plate are arranged in a tile shape.

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