JP3211853B2 - LCD panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal panel, and more particularly, to a multi-gap type liquid crystal panel capable of displaying a color image by using three primary color filters of red, green and blue. 2. Description of the Related Art In recent years, liquid crystal panels have been attracting attention as display devices that can replace CRTs because of their thinness, light weight, and high display quality. The recent mainstream is an active matrix type with high display quality. As a display mode of a liquid crystal panel, a TN (twisted nematic) type having a high display quality is mainly used.

[0002]

2. Description of the Related Art Generally, a TN type liquid crystal panel is roughly divided into two display modes, NW (normally white) and NB (normally black). In the NW mode, two polarizing plates sandwiching a liquid crystal are made orthogonal to each other,
In this mode, the transmittance is maximized when the applied voltage is low, the liquid crystal is twisted by 90 °, and the tilt is small. On the other hand, the NB mode is a mode in which the transmittance is minimized in the same state by making two polarizing plates sandwiching the liquid crystal parallel. In addition, when a sufficient voltage is applied to the liquid crystal, the liquid crystal tilts significantly because the liquid crystal is greatly tilted, and the transmittance is minimized in the NW mode.
It becomes maximum in the B mode.

[0003] However, there is a phenomenon generally called chromatic dispersion, which deteriorates the display quality of both modes. The wavelength dispersion is a phenomenon in which, when polarized light incident on a panel rotates the polarization direction by 90 ° along the twist of the liquid crystal, the angle of rotation slightly differs depending on the wavelength. This chromatic dispersion is particularly problematic in the NB mode. FIG. 1 shows coloring caused by wavelength dispersion in the dark state of the NB mode.
3 will be described.

As shown in FIG. 13 (a), incident light passes through a first polarizing plate 50 and is R (red), G (green), B (green).
(Blue) and passes through the liquid crystal layer 5
After passing through No. 4, the light reaches the second polarizing plate 56. At this time, the polarization axis of the second polarizing plate 56 is parallel to the polarization axis of the first polarizing plate 50, and the polarization plane is rotated by 90 ° when light passes through the liquid crystal layer 54. Therefore, light transmitted through the liquid crystal layer 54 is blocked by the second polarizing plate 56. Thus, the dark state of the NB mode is realized.

However, it was determined by a computer how the transmittance changes with the wavelength of each color with respect to the retardation Δn · d which is the product of the refractive index anisotropy Δn of the liquid crystal and the thickness d of the liquid crystal layer. The results are shown in the graph of FIG. 14, where the retardation Δn · d at which the transmittance of green light having the highest human luminous efficiency is the lowest is about 0.475. It can be seen that blue light and red light are slightly transmitted.

For this reason, when the panel is manufactured so that the light is rotated by 90 ° around the green light when transmitting the liquid crystal layer 54, the blue light is rotated by 90 ° or more and the red light is rotated by 90 °.し か Only rotates below. Therefore, as shown in FIG. 13A, while green light is blocked by the second polarizer 56, leakage of blue and red light causes a decrease in contrast and a purple color. Become. That is, in the NB mode, there is no condition for obtaining black even when the retardation Δn · d of the liquid crystal layer 54 is changed.

As a method of solving this problem, FIG.
As shown in (b), R of the color filter 52,
A multi-gap system in which the thickness of the liquid crystal layer 54 corresponding to G and B is increased in the order of R, G, and B has been considered. For example, the thickness of the liquid crystal layer 54 corresponding to R, G, B of the color filter 52 is set to 5.4 μm, 4.8 μm, respectively.
m and 3.7 μm have been proposed.
0-15982). Thereby, in principle, coloring due to wavelength dispersion can be considerably eliminated.

[0008]

However, even in the above-mentioned conventional multi-gap type liquid crystal panel, the light actually transmitted through each of the R, G, and B color filters of the backlight is not a single wavelength. 2 and 5, there is a problem that coloring due to the difference in optical rotation occurs even in the steps of the liquid crystal layer 54 corresponding to each of R, G, and B.

Although the chromaticity of the display color of the multi-gap type liquid crystal panel is very close to achromatic as compared with a panel without the multi-gap, the luminance in the dark state is very high, and the color is not black. There was also a problem that light black (grayish color) was obtained, and the contrast was almost the same as that of a panel without a multi-gap. Accordingly, it is an object of the present invention to provide a multi-gap type liquid crystal panel that can improve the contrast as well as the chromaticity of a display color.

[0010]

Means for Solving the Problems The present inventors have investigated the cause of the low contrast in the conventional multi-gap type liquid crystal panel. As shown in the schematic diagram of the multi-gap type liquid crystal panel of FIG.
The backlight light L1 radiated from 0 passes through a multi-gap color filter 12 composed of R, G, and B dot filters having different thicknesses, and passes through a red color filter transmitted light TR and a green color filter transmitted light TG. , Blue light transmitted through the color filter TB. These color filter transmitted lights TR, TG, TB have thicknesses dR, dG, dB, respectively.
, The red dot transmitted light UR, the green dot transmitted light UG, and the blue dot transmitted light UB. Then, unit light L2 composed of these dot transmitted lights UR, UG, UB is emitted.

Therefore, the display color of the liquid crystal panel is determined by a combination of the emission spectrum of the backlight 10, the transmission spectrum of the multi-gap color filter 12, and the transmission spectrum of the liquid crystal layer 14. Therefore, when determining the multi-gap step condition, it is necessary to consider all these conditions. Now, the thicknesses dR, dG, and dB of the liquid crystal layer 14 corresponding to the R, G, and B pixels are respectively represented by dR.
= 5.4 μm, dG = 4.8 μm, dB = 3.7 μm, and if the backlight 10 has an emission spectrum shown in the graph of FIG. 2, R, G, B, transmitted light from each pixel,
That is, the transmitted light spectra of the dot transmitted lights UR, UG, and UB in FIG. 1 are as shown in the graph of FIG.

That is, the R pixel well suppresses the transmission of red light near the wavelength of 600 nm, but the leakage light at the wavelength of 710 nm is rather large. In addition, the G pixel well suppresses the peak around the wavelength of 550 nm. However, the B pixel has a wavelength of 435.
Although the blue peak around nm is very well suppressed,
The transmission of green light having a wavelength of 545 nm and blue-green light having a wavelength of about 490 nm is very large.

By the way, the human eye perceives brightness differently depending on the wavelength even with light stimulation of equal energy.
While yellow-green light with a wavelength of 555 nm feels the brightest, it is darker as the wavelength shifts from it, and the wavelength is 380 nm.
No light below the wavelength of 780 nm or more is felt. For this reason, the very large transmission of green light that the human eye perceives as the brightest, here the blue-green and green light of wavelength 490 and 545 nm from the B pixel, increases the brightness in the dark state, This is considered to be the biggest cause of the decrease in contrast.

As described above, it has been found that the display color and contrast of the liquid crystal panel greatly change depending on the thickness dR, dG, and dB of the liquid crystal layer 14 corresponding to each of the R, G, and B pixels. Therefore, the present inventors have found a means for solving the above-mentioned problem by repeating experiments by changing the thicknesses dR, dG, and dB of the liquid crystal layer 14 corresponding to the R, G, and B pixels in various ways. .

That is, the above-mentioned problem is to be solved in a multi-gap type liquid crystal panel having red, green, and blue color filters, wherein at least the thickness of the liquid crystal layer on the red filter is larger than the thickness of the liquid crystal layer on the blue filter. The retardation of the liquid crystal layer on the blue filter is between 0.38 μm and 0.46 μm.
m, which is achieved by a liquid crystal panel.

In the above liquid crystal panel, the thickness of the liquid crystal layer on the red filter is greater than the thickness of the liquid crystal layer on the green filter, and the thickness of the liquid crystal layer on the green filter is greater than that on the blue filter. This is achieved by a liquid crystal panel characterized by being thicker than the liquid crystal layer. In the above liquid crystal panel, the liquid crystal panel is characterized in that the thickness of the liquid crystal layer on the red filter is equal to the thickness of the liquid crystal layer on the green filter.

In the above liquid crystal panel, the liquid crystal panel is characterized in that the thickness of the liquid crystal layer on the green filter is equal to the thickness of the liquid crystal layer on the blue filter. In the above liquid crystal panel, the liquid crystal panel is in a normally black mode, and is achieved by a liquid crystal panel. In the above liquid crystal panel,
This is achieved by the liquid crystal panel, wherein the liquid crystal panel is in a normally white mode.

[0018]

According to the present invention, the thickness of the liquid crystal layer of the conventional multi-gap type liquid crystal panel is designed so as to suppress the transmission of the peak wavelength of each of R, G and B light. , G, and B are not monochromatic (single-wavelength light), but have a spread.
The step condition is determined so that the thickness of the liquid crystal layer corresponding to the pixel No. is made larger than before and the retardation Δn · d becomes 0.38 μm to 0.46 μm.

As a result, in the NB mode, the chromaticity of the display color is almost the same as the conventional one, but the transmission of green light, which is the brightest to the human eye, can be suppressed. Can be improved.
Therefore, it is possible to achieve both the display color and the contrast, and to improve the contrast while maintaining the chromaticity of the display color satisfactorily.

Further, in the NW mode, which has conventionally been the mainstream of liquid crystal panels, the panel transmittance can be greatly improved.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the illustrated embodiments. FIG. 4 shows N according to the first embodiment of the present invention.
FIG. 3 is a schematic cross-sectional view showing a B-mode multi-gap liquid crystal panel. The first polarizing plate 20 receives the backlight having the spectral characteristics shown in the graph of FIG. On the first polarizing plate 20, a multi-gap color filter 22 composed of R, G, and B filters having different thicknesses is provided. It has transmission characteristics as shown in the graph. A first alignment film 24 is provided on the multi-gap color filter 22.
Is provided.

Further, a second polarizing plate 26 having a polarizing axis parallel to the polarizing axis of the first polarizing plate 20 is provided so as to face the first polarizing plate 20. And this second polarizing plate 26
A second alignment film 28 is provided below. Also,
The gap between the first alignment film 24 and the second alignment film 28 is filled with a liquid crystal having a refractive index anisotropy Δn = 0.094 (ZLI-4792 manufactured by Merck Ltd.), and a multi-gap type liquid crystal. The layer 30 is formed. And color filter 2
2, the thickness dR of the liquid crystal layer 30 on each of the R, G, and B filters.
, DG and dB are dR = 5.6 μm and dG =
This embodiment is characterized in that 5.0 μm and dB = 4.8 μm. When this is expressed by retardation Δn · d, Δn · dR = 0.53 μm and Δn · dG, respectively.
= 0.47 μm and Δn · dB = 0.45 μm.

The NB mode multi-gap type liquid crystal panel according to this embodiment is manufactured by the same manufacturing method as that of a normal multi-gap type liquid crystal panel.
That is, after applying, for example, a resin to which a red pigment is added to the first polarizing plate 20 to a predetermined thickness, the resin is patterned into a predetermined shape by selective exposure and development to form an R having a predetermined thickness. Is formed. Subsequently, a G filter and a B filter each having a predetermined thickness are sequentially formed by applying, selectively exposing, and developing a resin to which a predetermined pigment is added, in the same procedure. By controlling the thicknesses of the R, G, and B filters in this way, the thicknesses dR, dG, and dB of the liquid crystal layer 30 on the R, G, and B filters are controlled.

When the inventors prototyped the NB mode liquid crystal panel according to the present embodiment, a contrast of 90 or more could be obtained. The above conventional gap condition, ie, d
R = 5.4 μm, dG = 4.8 μm, dB = 3.7 μm
Compared with the case where the contrast is 50 or less, the luminance in the dark state is lower and the contrast is significantly higher. This is the color filter 22 B
Retardation Δn · d of the liquid crystal layer 30 on the filter of
Is set to 0.45 μm, the transmission of blue-green light having a wavelength of about 490 nm is suppressed. However, since blue light having a wavelength of about 435 nm was transmitted, the chromaticity of the display color was more bluish than in the case of the conventional gap condition.

As described above, according to the present embodiment, in the NB mode multi-gap type liquid crystal panel, the retardation Δn · d of the liquid crystal layer 30 on each of the R, G, and B filters of the color filter 22 is respectively set. 0.53 μm,
By setting them to 0.47 μm and 0.45 μm, the wavelength 4
Since the transmission of blue-green light near 90 nm is suppressed, the brightness in the dark state can be reduced and the contrast can be significantly improved.

Next, an NW mode liquid crystal panel according to a second embodiment of the present invention will be described with reference to FIG. FIG. 6 is a schematic sectional view showing an NW mode multi-gap type liquid crystal panel according to the second embodiment. Note that FIG.
The same reference numerals are given to the same components as those of the liquid crystal panel shown in FIG.

In the present embodiment, a second polarizing plate 32 having a polarizing axis perpendicular to the polarizing axis of the first polarizing plate 20 is provided instead of the second polarizing plate 26 in the first embodiment. Only the point different from the case of the first embodiment is the same as that of the first embodiment. Accordingly, the thicknesses dR, dG, and dB of the liquid crystal layer 30 on the R, G, and B filters of the color filter 22 are respectively dR = 5.6 .mu.m and dG.
= 5.0 μm and dB = 4.8 μm. That is,
In the present embodiment, the multi-gap method conventionally used only in the NB mode is applied to the NW mode under the above-described gap conditions.

When the present inventors prototyped a liquid crystal panel of the NW mode according to the present embodiment, the brightness in the bright state was increased, the panel transmittance was improved by 10% or more, and the contrast was not multi-gap. If it is 100, it is improved to 110. This is because, by setting the retardation Δn · d of the liquid crystal layer 30 on the B filter of the color filter 22 to 0.45 μm, contrary to the case of the first embodiment, the blue-green This is because light has been transmitted well. In addition, the chromaticity in the dark state was almost achromatic.

As described above, according to the present embodiment, in the NW mode multi-gap type liquid crystal panel, the retardation Δn · d of the liquid crystal layer 30 on each of the R, G, and B filters of the color filter 22 is respectively set. 0.53 μm,
By setting them to 0.47 μm and 0.45 μm, the wavelength 4
Since blue-green light near 90 nm is well transmitted, the brightness in the bright state can be increased to improve the panel transmittance, and the contrast can be improved. Further, the chromaticity in the dark state can be almost achromatic. Therefore, a panel having high transmittance, high contrast, and extremely excellent display color can be realized.

For example, the NW mode liquid crystal panel according to the present embodiment is considered to be very effective for a notebook personal computer. Notebook PCs require a small reduction in power consumption for battery operation, and have a panel transmittance of 1
0% improvement means 10% increase in backlight brightness
This is because even at darkness, the same image quality as that of the related art can be obtained.

Next, an NB mode liquid crystal panel according to a third embodiment of the present invention will be described with reference to FIG. FIG. 7 is a schematic sectional view showing an NB mode multi-gap type liquid crystal panel according to the third embodiment. Note that FIG.
The same reference numerals are given to the same components as those of the liquid crystal panel shown in FIG.

This embodiment is basically the same as the structure of the first embodiment, except that the thicknesses dR and d of the liquid crystal layer 30 on the R, G and B filters of the color filter 22 are different.
G and dB are dR = 5.0 μm and dG = 5.0 μ, respectively.
The only difference is that m and dB = 4.8 μm. That is, the present embodiment is characterized in that the thicknesses dR and dG of the liquid crystal layer 30 on the R and G filters of the color filter 22 are made equal.

When the present inventors prototyped the NB mode liquid crystal panel according to the present embodiment, the red light having a wavelength of about 600 nm was slightly transmitted, and the chromaticity of the display color was better than that of the liquid crystal panel having no step. However, the contrast was improved to 60 or more. In addition, since the thickness dR and dG of the liquid crystal layer 30 on each of the R and G filters are made equal, the step provided in the color filter 22 can be reduced to one step, so that the manufacturing is very easy.

As described above, according to the present embodiment, in the NW mode multi-gap type liquid crystal panel, the retardation Δn · d of the liquid crystal layer 30 on each of the R, G, and B filters of the color filter 22 is determined. 0.47 μm,
By setting them to 0.47 μm and 0.45 μm, the wavelength 4
Since transmission of blue-green light near 90 nm is suppressed, the same effect as in the case of the first embodiment can be obtained, and the number of steps provided in the color filter 22 is reduced. And manufacturing unevenness can be reduced.

Next, a liquid crystal panel according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a schematic sectional view showing an NW mode multi-gap type liquid crystal panel according to the third embodiment. The same components as those of the liquid crystal panel shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is basically the same as the structure of the second embodiment, except that the thicknesses dR and d of the liquid crystal layer 30 on the R, G and B filters of the color filter 22 are different.
G and dB are dR = 5.0 μm and dG = 5.0 μ, respectively.
The only difference is that m and dB = 4.8 μm. That is, the present embodiment is characterized in that the thicknesses dR and dG of the liquid crystal layer 30 on the R and G filters of the color filter 22 are made equal.

When the present inventors prototyped the NW mode liquid crystal panel according to the present embodiment, the red transmitted light near the wavelength of 600 nm was slightly reduced, and the transmittance was improved by about 5%. The chromaticity in the dark state was almost achromatic. Further, the thickness dR, d of the liquid crystal layer 30 on each of the R and G filters
By making G equal, the step provided in the color filter 22 can be reduced to one step, so that the manufacturing is very easy.

As described above, according to the present embodiment, in the NW mode multi-gap type liquid crystal panel, the retardation Δn · d of the liquid crystal layer 30 on each of the R, G, and B filters of the color filter 22 is determined. 0.47 μm,
By setting them to 0.47 μm and 0.45 μm, the wavelength 4
Since blue-green light near 90 nm is well transmitted, the second
The same effect as that of the embodiment can be obtained, and the number of steps provided in the color filter 22 is reduced, so that the production becomes very easy and the production unevenness can be reduced.

Next, a liquid crystal panel according to a fifth embodiment of the present invention will be described with reference to FIG. FIG. 9 is a schematic sectional view showing an NB mode multi-gap type liquid crystal panel according to the fifth embodiment. The same components as those of the liquid crystal panel shown in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is basically the same as the structure of the first embodiment, except that the thicknesses dR, d of the liquid crystal layer 30 on the R, G, B filters of the color filter 22 are different.
G and dB are dR = 5.6 μm and dG = 5.0 μm, respectively.
The only difference is that m and dB = 5.0 μm. That is, the present embodiment is characterized in that the thicknesses dG and dB of the liquid crystal layer 30 on the G and B filters of the color filter 22 are made equal.

When the present inventors prototyped the NB mode liquid crystal panel according to the present embodiment, the same results as in the third embodiment were obtained. However, the third embodiment is different from the third embodiment in that the red light having a wavelength of about 600 nm is slightly transmitted, while the present embodiment is slightly transmitting the blue light having a wavelength of about 435 nm. As described above, according to the present embodiment, in the NW mode multi-gap liquid crystal panel, the retardation Δn · d of the liquid crystal layer 30 on each of the R, G, and B filters of the color filter 22 is 0.53 μm. , 0.47 μm and 0.47 μm, although the effect is slightly insufficient, the same effect as in the first embodiment can be obtained, and the same as in the third embodiment. In addition, the production becomes very easy, and the production unevenness can be reduced.

Next, a liquid crystal panel according to a sixth embodiment of the present invention will be described with reference to FIG. FIG. 10 shows the third
FIG. 4 is a schematic cross-sectional view showing a NW mode multi-gap type liquid crystal panel according to the embodiment of FIG. The same components as those of the liquid crystal panel shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is basically the same as the structure of the second embodiment, except that the thicknesses dR and d of the liquid crystal layer 30 on the R, G and B filters of the color filter 22 are different.
G and dB are dR = 5.6 μm and dG = 5.0 μm, respectively.
The only difference is that m and dB = 5.0 μm. That is, the present embodiment is characterized in that the thicknesses dG and dB of the liquid crystal layer 30 on the G and B filters of the color filter 22 are made equal.

When the present inventors prototyped a liquid crystal panel of the NW mode according to the present embodiment, substantially the same results as in the case of the fourth embodiment were obtained. However, the fourth embodiment differs from the fourth embodiment in that the red transmitted light near the wavelength of 600 nm is slightly reduced, whereas the present embodiment is slightly reduced in the blue transmitted light near the wavelength of 435 nm. As described above, according to the present embodiment, in the NW mode multi-gap type liquid crystal panel, the retardation Δn · d of the liquid crystal layer 30 on each of the R, G, and B filters of the color filter 22 is 0.53 μm. , 0.47 μm, and 0.47 μm, blue-green light having a wavelength of about 490 nm is well transmitted, and although the effect is slightly insufficient, the same effect as that of the second embodiment can be obtained. In addition to the above, the manufacturing becomes very easy as in the case of the fourth embodiment, and the unevenness in manufacturing can be reduced.

Next, a liquid crystal panel according to a seventh embodiment of the present invention will be described with reference to FIG. FIG. 11 shows the seventh
FIG. 4 is a schematic cross-sectional view showing an NB mode multi-gap type liquid crystal panel according to an embodiment of the present invention. The same components as those of the liquid crystal panel shown in FIG. 4 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is basically the same as the first embodiment, except that the thicknesses dR and d of the liquid crystal layer 30 on the R, G and B filters of the color filter 22 are different.
G and dB are dR = 5.6 μm and dG = 5.0 μm, respectively.
The only difference is that m and dB = 4.2 μm. That is, the liquid crystal layer 30 on the B filter of the color filter 22
Is an intermediate value between the conventional condition in which the chromaticity of the display color is good, that is, dB = 3.7 μm, and the condition of the first embodiment in which the contrast is good, ie, dB = 4.8 μm. This is a feature of the present embodiment.

When the present inventors prototyped the NB mode liquid crystal panel according to the present embodiment, the blue light near the wavelength of 435 nm and the blue green light near the wavelength of 490 nm slightly transmitted, but the chromaticity in the dark state was considerably large. The color was almost achromatic and the contrast was 80. In this case, the chromaticity in the dark state is almost equal to that of the conventional multi-gap system, and the contrast is improved by 1.6 times.

The spectrum of the transmitted light from the B pixel at this time was as shown in the graph of FIG.
For comparison, the spectrum of the transmitted light from the B pixel under the above-mentioned conventional gap condition is indicated by a broken line in the graph. From this graph, it can be seen that the transmission of blue light around the wavelength of 435 nm is slightly larger than that of the conventional condition,
It can be seen that the transmission of blue-green light near m and green light near 545 nm is significantly suppressed compared to the conventional condition. Therefore, the thickness dB of the liquid crystal layer 30 on the B filter
Was made thicker than in the past, it was confirmed that there was a condition in which the chromaticity of the display color and the contrast were compatible.

As described above, according to the present embodiment, in the NB mode multi-gap type liquid crystal panel, the retardation Δn · d of the liquid crystal layer 30 on each of the R, G, and B filters of the color filter 22 is respectively set. 0.53 μm,
By setting the thickness to 0.47 μm or 0.39 μm, it is possible to improve the contrast while maintaining the chromaticity of the display color satisfactorily.

In the first, third, fifth, and seventh embodiments, the thicknesses dR, dG, and dB of the liquid crystal layer 30 on the R, G, and B filters of the color filter 22 are respectively set. Although set to predetermined values, it is needless to say that the present invention is not limited to these values. In general, if the chromaticity of the display color of the liquid crystal panel is emphasized, the contrast tends to decrease, and if the contrast is emphasized, the chromaticity tends to deteriorate. Therefore, the retardation of the liquid crystal layer on the B filter is 0.38 μm.
The thickness dR, d of the liquid crystal layer 30 on each of the R, G, and B filters depends on how much chromaticity or contrast is emphasized within the range of 0.46 μm.
It is desirable to control G and dB respectively.

[0051]

As described above, according to the present invention, red, green,
In a multi-gap type liquid crystal panel having a blue color filter and a liquid crystal layer on the red filter at least thicker than the liquid crystal layer on the blue filter, the retardation of the liquid crystal layer on the blue filter is reduced. , 0.38 μm to 0.46 μm, in the case of the NB mode, it is possible to suppress the transmission of green light, which is most brightly perceived by the human eye, so that the chromaticity of the display color can be kept good. Thus, the contrast can be greatly improved.
On the other hand, in the case of the NW mode, on the contrary, green light is transmitted well, so that the transmittance of the panel can be improved.
Can greatly contribute to the promotion of the mode,
In the NW mode, which has conventionally been the mainstream of liquid crystal panels, the improvement of the panel transmittance can be used very effectively especially in the field where low power consumption is required.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a multi-gap type liquid crystal panel.

FIG. 2 is a graph showing an emission spectrum of a backlight.

FIG. 3 shows dot transmission lights UR, UG, and R from pixels R, G, and B in a conventional multi-gap type liquid crystal panel.
It is a graph which shows the transmitted light spectrum of UB.

FIG. 4 is a schematic sectional view showing an NB mode multi-gap type liquid crystal panel according to the first embodiment of the present invention.

FIG. 5 is a graph showing transmission characteristics of a color filter including R, G, and B filters.

FIG. 6 is a schematic sectional view showing an NW mode multi-gap type liquid crystal panel according to a second embodiment of the present invention.

FIG. 7 is a schematic sectional view showing an NB mode multi-gap type liquid crystal panel according to a third embodiment of the present invention.

FIG. 8 is a schematic sectional view showing an NW mode multi-gap type liquid crystal panel according to a fourth embodiment of the present invention.

FIG. 9 is a schematic sectional view showing an NB mode multi-gap type liquid crystal panel according to a fifth embodiment of the present invention.

FIG. 10 is a schematic sectional view showing an NW mode multi-gap type liquid crystal panel according to a sixth embodiment of the present invention.

FIG. 11 is a schematic sectional view showing an NB mode multi-gap type liquid crystal panel according to a seventh embodiment of the present invention.

12 is a graph showing a spectrum of transmitted light from a B pixel in the liquid crystal panel shown in FIG.

FIG. 13 is a schematic diagram for explaining a conventional method of dissolving coloring by wavelength dispersion and coloring by a multi-gap method in a dark state of an NB mode.

FIG. 14 is a graph showing a change in transmittance depending on the wavelength of each color with respect to the retardation Δn · d of the liquid crystal.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Backlight 12 ... Multi gap color filter 14 ... Liquid crystal layer 20 ... First polarizing plate 22 ... Multi gap color filter 24 ... First alignment film 26 ... Second polarizing plate 28 ... Second alignment film Reference Signs List 30: liquid crystal layer 32: second polarizing plate L1: backlight light TR: red color filter transmitted light TG: green color filter transmitted light TB: blue color filter transmitted light dR, dG, dB: thickness of liquid crystal layer UR: Red dot transmitted light UG Green dot transmitted light UB Blue dot transmitted light L2 Unit light 50 First polarizing plate 52 Color filter 54 Liquid crystal layer 56 Second polarizing plate

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshishiro Katayama 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Kunihiro Tashiro 1015 Kamikodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Fujitsu Limited (72) Inventor Tadashi Hasegawa 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-4-319914 (JP, A) JP-A-5-181129 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) G02F 1/1335

Claims (3)

(57) [Claims] [Claim 1] have red, green, and blue color filters, red
Of liquid crystal layer on green filter and liquid crystal layer on green filter
And the red filter and the green
The thickness of the liquid crystal layer on the filter is rather thick than the thickness of the liquid crystal layer on the blue filter, the retardation of the liquid crystal layer on the blue filter is characterized in that it is a 0.38μm to 0.46μm LCD panel. 2. The method of claim 1 Symbol mounting the liquid crystal panel, the liquid crystal panel in which the liquid crystal panel, characterized in that it is a normally black mode. 3. The method of claim 1 Symbol mounting the liquid crystal panel, the liquid crystal panel in which the liquid crystal panel, characterized in that a normally white mode.