JPH10161121A - Color adjustment method for color image display device - Google Patents

Abstract

(57) [Problem] To provide a color adjusting method of a color image display device capable of adjusting an angle of a dichroic mirror with good workability without lowering color purity. SOLUTION: B, R, G formed on a single pixel substrate
Micro-lenses are arranged facing each other for each pixel set, and B, R, and G color lights obtained by color-separating and reflecting white light by three dichroic mirrors 6B, 6R, and 6G arranged on the same optical path. In a single-panel CF-less color liquid crystal projector that performs color screen display by causing the microlens to enter the microlens at different angles and distributing the light emitted from the microlens for each color to the corresponding pixels, a pixel to be adjusted (for example, R The dichroic mirror is adjusted so that the total sum of the amounts of the leaked light in the adjacent pixels (for example, G and B) on both sides of ()) is minimized. As a result, the amount of leaked light in each of the adjacent pixels on both sides can be made equal to each other, and a sufficient color reproduction range and color purity can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color adjusting method for a color image display device using a single-plate pixel display unit without using a color filter, and more particularly to a method for adjusting each color formed on a single substrate. A light-collecting member such as a microlens is disposed facing each other for each pixel group, and each color light obtained by performing color separation of white light by a plurality of dichroic mirrors arranged on the same optical path is different from each other to the light-collecting member. Incident at an angle,
The present invention relates to a color adjustment method for a color image display device that achieves high luminance by distributing and emitting light of each color from a light condensing member to pixels for displaying each color.

[0002]

2. Description of the Related Art In recent years, a liquid crystal projector and a liquid crystal projection TV, which use a liquid crystal panel as an optical switching element and project an image on the liquid crystal panel onto a screen by a projection optical system, have been actively developed. ing. These devices are thin, lightweight, sharp images,
It has excellent performance such as being not affected by geomagnetism and requiring no registration adjustment.

[0003] Such liquid crystal display devices include B (blue),
A single-panel system using one liquid crystal panel having three color filters of R (red) and G (green), and a monochrome liquid crystal panel are provided for each of the B, R, and G optical paths. 3
There is a board method. Of these, the single-panel method has a simple structure and is easy to reduce in size, weight, and cost. But it is disadvantageous.

In order to deal with such a problem, for example, Japanese Patent Laid-Open Publication No. Hei 4-60538 or "ASIA DISP"
In LAY '95, p887 ', one condensing microlens is arranged for every three pixels for driving liquid crystal pixels, and B, R, and G of each of these microlenses are viewed from different directions. There is disclosed a single-panel color liquid crystal display device in which colors are made incident and condensed, and the emitted light is made incident on pixels corresponding to three colors of B, R and G, respectively. In this color liquid crystal display device, a region between pixels (a TFT which is a switching element for driving a pixel)
The light incident on the (black matrix portion on which is formed) can also be used effectively, and the substantial aperture ratio is increased, so that high brightness can be achieved.

[0005]

In such a color liquid crystal display device, the angles of incidence of the B, R, and G color lights incident on the respective microlenses from different directions are equal to the three light beams disposed on the same optical path. The dichroic mirrors are set by adjusting the angles of the dichroic mirrors, respectively. Depending on the adjustment, each color light emitted from the microlens is not only sent to the corresponding color pixel, but also to the adjacent other color pixel. May also be incident. In this case, the color purity of the displayed image is reduced, and the image quality may be significantly impaired.

However, conventionally, there has been no effective adjustment method of the dichroic mirror in the color liquid crystal display device having the above-mentioned configuration. In particular, there is a strong demand for high definition, high image quality, high luminance and the like. In projectors and the like, a method of adjusting a dichroic mirror has been a major problem in manufacturing.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a dichroic mirror for a high-definition (small pixel pitch) single-panel color image display device so that the color purity does not decrease. An object of the present invention is to provide a color adjustment method for a color image display device that can optimize angle adjustment.

[0008]

A color adjusting method for a color image display device according to the present invention is provided for each of a plurality of colors which are the basis of color display, and transmits color light passing through itself for the color. A pixel that modulates according to an image signal, a light-collecting member commonly disposed for each of a plurality of pixels, and a plurality of dichroic mirrors for color-separating white light into a plurality of color lights that is a basic color display. A color image in which the color lights separated by the dichroic mirror are made incident on the common light-collecting member at different angles, and the light emitted from the light-collecting member for each color is distributed and incident on pixels for each color. In the display device, the total amount of light of the one color light that has passed through only the pixel for the color that is complementary to the one color light is measured, and white light is separated into the one color light based on the measurement result. Die for Those constructed as adjusting the angle of Roikkumira.

More specifically, the angle of the dichroic mirror is adjusted such that the total sum of the light amounts of the one color light that has passed through only the color pixels that are complementary to the one color light is minimized. In this case, the sum of the light amounts of the one color light is
This is performed using a color separation filter that transmits only the one color light, and an integrating sphere or a diffusion plate is used as necessary. For example, three primary colors of red, green, and blue can be adopted as a plurality of colors that are the basis of color display.

In this color adjusting method for a color image display device, the sum of the light amounts of the one color light that has passed through only the pixels for the color that is complementary to the one color light is obtained, and based on the sum of the light amounts, The angle of the dichroic mirror for white light is adjusted. That is, the color light of the adjustment target transmitted through the adjacent pixel having a complementary color relationship with the color pixel to be adjusted is measured as leakage light, and the dichroic mirror for the color is determined based on the level of the leakage light. Is adjusted. The angle adjustment of each dichroic mirror can be performed after all the dichroic mirrors for multiple color separation, which are the basis of color display, are incorporated in the color image display device.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. Here, as an example of the image display device, a color adjusting method in a color liquid crystal projector (hereinafter, referred to as a single-plate CF-less color liquid crystal projector) formed of a single-panel liquid crystal panel without using a color filter (CF) will be described. .

FIG. 1 shows a device arrangement and a device structure for explaining a color adjusting method of a single-plate CF-less color liquid crystal projector according to an embodiment of the present invention. First, the configuration and operation of the single-panel CF-less color liquid crystal projector will be briefly described.

[Structure and operation of single-plate CF-less color liquid crystal projector] This single-plate CF-less color liquid crystal projector 100 has a housing 1, a white light source 2, an integrator 3, a relay lens 4, a collimator lens. 5 and a dichroic mirror 6 provided on the same optical path
B, 6R, 6G and LC for driving and controlling the LCD panel 8
D driving device 7 and dichroic mirrors 6B, 6R, 6
A liquid crystal (LCD) panel 8 for intensity-modulating each of B, R, and G color lights separated by G in accordance with a color image signal;
A projection lens 9 for condensing the light emitted from the D panel 8 and combining the colors on a screen (not shown in this drawing) is provided.

As the white light source 2, for example, a halogen lamp, a metal halide lamp or the like is used. The integrator 3 diffuses the white light emitted from the white light source 2,
This is for making the in-plane illuminance distribution in the liquid crystal panel 8 uniform. The LCD driving device 7 has B, R,
When an adjustment is made for a certain color of G, a complementary color display function is provided in which only a color having a complementary color relationship with the color can be raster-displayed. Specifically, for example, when the R color is adjusted, only the B pixel and the G pixel on the LCD panel 8 are in the shutter open state to transmit the incident light, and the R pixel is in the shutter closed state to perform the light adjustment. Is a function that does not transmit light. In this case, it is desirable that the complementary color display can be performed with the maximum contrast (specifically, the light transmittance of the B pixel and the G pixel is 100%, and the light transmittance of the R pixel is 0%). .

The dichroic mirrors 6B, 6R, and 6G are arranged so as to form a small angle with each other, and selectively reflect white parallel light emitted from the collimator lens 5 at an angle of approximately 45 ° to B, R, and G. And has a function of causing each of the colors to enter the LCD panel 8 at a different angle. In this example, dichroic mirrors 6B, 6B
As shown in FIG. 1 and FIG.
The light is perpendicularly incident on the CD panel 8, and the B light and the G light are LC with respect to the R light at angles of [+ θ] and [−θ], respectively.
It is arranged so as to be incident on the D panel 8. Where L
The light vertically incident on the CD panel 8 is B light (or G light), and the light incident at an angle of [+ θ] or [−θ] with respect to the vertical direction is R light / G light (or R light / B light). (Light). Dichroic mirrors 6B, 6R,
6G is arranged in a direction parallel to the plane of FIG. 1 (a swing angle direction) and a direction perpendicular to the plane of the paper (a tilt angle direction).
Can be fine-tuned in two directions, thereby making the incident angle [+
θ] and [−θ] can be finely adjusted. This fine adjustment mechanism can be configured by attaching, for example, a micrometer or the like as a jig.

Although polarizing plates are arranged before and after the LCD panel 8, they are not shown here.

FIG. 2 shows an enlarged cross-sectional structure of the LCD panel 8 in FIG. As shown in this figure, the LCD panel 8 includes a pixel substrate 81 on which a large number of pixel electrodes are formed, a counter substrate 82 on which a counter electrode and a microlens (both not shown in this drawing) are formed, and a pixel substrate 81. The liquid crystal device includes a liquid crystal layer 83 interposed between the liquid crystal layer 81 and a counter substrate 82. The pixel substrate 81 is composed of a glass substrate 81a and Bs arranged regularly (periodically) on one surface side (light incident side in the figure) of the glass substrate 81a from the bottom to the top in the figure.
Pixel electrodes 81B, 81R, 81G for light, R light, and G light
And a TF functioning as a switching element for applying a voltage corresponding to an image signal to each of the pixel electrodes.
Black matrix portion 81b made of T (not shown) or the like
And Each TFT has a gate electrode, a drain electrode, and a source electrode (all not shown) made of, for example, polysilicon. Of these, the gate electrode is
Source electrodes are connected to address wiring (not shown) running up and down in the direction of the paper of the drawing, source electrodes are connected to B, R, and G data wirings (not shown) running in the direction perpendicular to the paper of the drawing, and drain electrodes are provided. Is connected to each of the pixel electrodes 81B, 81R, 81G. Then, B, R, and G image signal voltages are selectively applied to the pixel electrode selected by the address wiring and the data wiring, so that the liquid crystal layer 83 in the liquid crystal layer 83 between the pixel electrode and the counter electrode 82d. The orientation of the liquid crystal molecules is changed, and the polarization direction of light passing therethrough is changed. The black matrix portion 81b is shielded from light by a metal film such as aluminum (not shown),
The FT does not malfunction.

On the other hand, the opposite substrate 82 is a glass substrate 82a.
And a converging microlens 82b formed on one surface side ((light emitting side)) of the glass substrate 82a, and a cover glass 82c closely mounted on the microlens 82b.

The opposing electrode 82d is a transparent electrode formed on the entire surface of the cover glass 82c or on a necessary area (ie, at least an area opposing the pixel electrodes 81B, 81R, and 81G of the pixel substrate 81). Fixed.

The micro lens 82b is formed as a gradient index lens by, for example, a method of etching a substrate into a lens shape and embedding a transparent resin or a selective ion diffusion method, but is formed by any other method. It may be. Further, the micro lens 82b is usually formed as a semi-cylindrical lens having an axis in a direction perpendicular to the plane of the drawing, but may be a general spherical lens or a lens having a curved surface close thereto.

The micro lens 82b is formed and arranged for each of the three pixel electrodes 81B, 81R and 81G of the pixel substrate 81. The B, R, and G light beams incident on the microlenses from three different directions are condensed, respectively, and passed through the liquid crystal layer 83 to the pixel electrodes 81B, 81B.
R and 81G respectively. Here, for example, focusing on the R light of vertical incidence, the focus of the microlens 82b is usually set on or near the pixel electrode 81R, but may be set at a deep position inside the glass substrate 81a as necessary. It may be. Other light (B
Light and G light).

Next, the operation of the single-panel CF-less color liquid crystal projector having such a configuration will be described.

As shown in FIG. 1, the white light emitted from the white light source 2 is subjected to light diffusion by the integrator 3 and then becomes parallel light by the collimator lens 5 via the relay lens 4 and becomes dichroic mirrors 6B, 6R, 6G. This parallel white light is applied to the dichroic mirror 6B,
After being separated into three colors B, R, and G by 6R and 6G, the light is linearly polarized through a front polarizer (not shown).
The light enters the microlenses 82b of the D panel 8 from different directions. The LCD panel 8 modulates the intensity of each color light of B, R, and G according to a color image signal and emits the light.

Here, one of the micro lenses 82b is
Consider light incident on one microlens ML.
Since the R light is perpendicularly incident on the glass substrate 82a, it is focused on or near the pixel electrode 81R through which the optical axis of the microlens ML passes. The B light is incident on the glass substrate 82a at an incident angle θ, is refracted at a refraction angle ψ, and then enters the microlens ML at the same incident angle ψ, and forms a straight line that forms an angle と with the optical axis of the microlens ML. Focuses on or near the pixel electrode 81B adjacent to the pixel electrode 81R. Similarly, the G light is incident on the glass substrate 82a at an incident angle [−
θ) and refracted at a refraction angle ψ, then enters the microlens ML at the same angle of incidence ψ, passes through a straight line that forms an angle [−ψ] with the optical axis of the microlens ML, and passes through the pixel electrode 81.
Focus is on the pixel electrode 81G adjacent to R or in the vicinity thereof.

At this time, the voltage applied to the pixel electrodes 81B, 81R, 81G changes according to the applied pixel signal,
Accordingly, the polarization directions of the B, R, and G color lights passing through the liquid crystal layer 83 are modulated.

The pixel electrodes 81B, 81R,
B focused on or near 81G,
The R and G color lights spread again, respectively, and the glass substrate 8
After being emitted from 1a and selectively transmitted through a rear polarizing plate (not shown), the light is condensed by the projection lens 30 and is color-combined on the screen 40.

Next, a method of adjusting the color of the single-panel CF-less color liquid crystal projector having the above-described configuration will be described.

[Explanation of Dichroic Mirror Angle Adjustment Method] In this adjustment method, as shown in FIG.
A color separation filter 10 is arranged on the light emission side of the color LCD projector 100, and an integrating sphere 11 is arranged on the light emission side of the color separation filter 10. The dichroic mirrors 6B, 6B, 6B, 6C, 6D, 6C, 6D, 6F, 6F, 6F, 6F, 6F, 5F, 5F, 5F, 5F, 5F, 5F, 5F, 5F, 5F, 5F, 6F, 6F, 6F, 6F, 6F, 6F, 6F, 6F, 6F, 6F, 6F, 6C, and 10F light enter the integrating sphere 11.
R, 6G angle adjustment is performed. The integrating sphere 11 is an optical sensor 12
The detection voltage photoelectrically converted by the optical sensor 12 is displayed on the illuminance meter 13 as an average illuminance. The color separation filter 10 has a function of transmitting only one of B, R, and G colors. The material and the like are not particularly limited, but it is desirable to use a material having sufficiently good color purity characteristics, that is, spectral transmission characteristics. In addition, as the color separation filter 10, for B transmission, R
It is necessary to use three types, one for transmission and the other for G transmission. However, it is preferable to incorporate these in a turret type so that the filter can be replaced with a single touch by rotating or sliding operation, because workability is good and preferable.

Next, a method for adjusting the color of the color image display device according to the present invention will be described in detail with reference to FIGS. Here, for the sake of simplicity, dichroic mirror 6B
It is assumed that the angle adjustment is performed only in the rotation direction in the plane of FIG. However, the direction perpendicular to the paper (the tilt direction)
It is needless to say that the present invention can be applied to the case where the adjustment is made.

First, a procedure for adjusting the R color, for example, will be described. The adjustment of the R color is performed by adjusting the angle of the dichroic mirror 6R. In this case, an R transmission filter 10R is used as the color separation filter 10, and the LCD panel 8
Raster display of G / G which has a complementary color relationship with the R color to be adjusted
Display B. In this case, LCD driving unit 7, by selectively driving control each TFT on the pixel substrate 81 in FIG. 2, only the G pixel P _G and B pixel P _B and the shutter opened state, R pixel P _R is The shutter is closed. When the angle of the dichroic mirror 6R is finely adjusted in this state,
The focal position of the R light swings up and down in FIG. Ideally, the focal point is literally a “point”, but in practice, the focal point is blurred due to the influence of aberration, diffraction, and the like of the micro lens 82b. As a result, a part of the R light flux is a target R pixel P
_The adjacent black matrix portion 81 that protrudes from _R
b, and adjacent pixels (G pixel P _G and B pixel P
_B ). These neighboring pixels P _G, the P _B, are respectively incident also G light and B light emitted at different angles from the microlens 82b. As a result, light passing through the G pixel P _G is part of the R light (hereinafter, referred to as R leakage light.) And becomes G light, B pixel P _B
Are R leaked light and B light. Therefore,
The light finally emitted from the LCD panel 8 is G light, B light
Light, and becomes a mixture of R leakage light passing through the G pixel P _G and B pixel P _B.

When these mixed lights enter the color separation filter 10R, the G light and the B light are cut off,
R leaking light only that has passed through the G pixel P _G and B pixel P _B passes through and enters the integrating sphere 11. The optical sensor 12 of the integrating sphere 11 detects an integrated value (average illuminance) of illuminance obtained as a result of diffuse reflection on the inner surface of the integrating sphere 11 and displays the value on an illuminometer 13. The values obtained in this way are separated and generated by the dichroic mirror 6R and the micro lens 82
Of the condensed R light b, the pixel P _G except R pixel P _R in the pixel substrate 81 of the LCD panel 8, represents the sum of the R leakage light passing through the P _B.

Here, in the present adjusting method, the dichroic mirror 6R is adjusted with the point at which the level of the R leaked light is minimized as the best position. Thereby, the G pixel P
It is possible to make the intensity of the R leak light that has passed through _G equal to the intensity of the R leak light that has passed through the B pixel P _B. This is for the following reasons.

[0033] Figure 4, which sum of R leakage light indicates how in what relation the intensity ratio of the R leakage light passed through the R leakage light and the B pixel P _B that has passed through the G pixel P _G It is. In this figure, the horizontal axis represents the intensity ratio of the R leakage light passed through the R leakage light and the B pixel P _B that has passed through the G pixel P _G, and the vertical axis represents the sum of the R leakage light. The unit of each axis is arbitrary. This, as shown in FIG., The G pixel P _G R leakage light passed through the B pixel P _B R leaking light that has passed through the, are substantially equal when the total sum of R leakage light is minimized. Based on this point, in the present adjustment method, by performing the dichroic angle adjustment of the dichroic mirror 6R so that the sum of the R leaking light emitted from the LCD panel 8 is minimized, G pixels adjacent to the R pixel P _R P _G And the level of the R leaked light that has passed through each of the _B and P pixels P _B is equalized, and the color balance can be improved. In addition, since the R leaked light actually exists as a mixed color component, the color purity for the G and B colors can be optimized by performing the above adjustment.

Next, the procedure for adjusting the G color will be described. The adjustment of the G color is performed by adjusting the angle of the dichroic mirror 6G. In this case, a G transmission filter 10G is used as the color separation filter 10, and the raster display on the LCD panel 8 is an R / B display having a complementary color relationship with the G color to be adjusted. In this case, LCD driving unit 7, and selectively drives and controls the each TFT on the pixel substrate 81 in FIG. 2, R pixel P _R
And only B pixel P _B and the shutter opened, G pixels P
_G is a shutter closed state. In this case, light passing through the R pixel P _R, a part of the G light (hereinafter, referred to as G leakage light.) And becomes R light, the light passing through the B pixel P _B is G leaked light and B
It becomes light. Thus, the light eventually emitted from the LCD panel 8, R light, B light, and becomes a mixture of G leaked light passing through the R pixel P _R and B pixel P _B. When the mixed light is incident on the color separation filter 10G, these R and B lights is cut, only the G leaked light passing through the R pixel P _R and B pixel P _B passes through and enters the integrating sphere 11 . Thereby, the average illuminance is displayed on the illuminometer 13. The value obtained in this way is a dichroic mirror 6
Of the G light condensed by the separation generated after the microlens 82b by G, represents the pixel P _R in the pixel substrate 81 other than the G pixel P _G of the LCD panel 8, the sum of the G leaked light passing through the P _B . Then, the dichroic mirror 6G is adjusted so that the total sum of the G leaked light is minimized. Thus, equal levels of G leakage light R pixel P _R and B pixel P _B were passed through respectively adjacent to the G pixel P _G, the color balance can be improved, moreover, for the R and B color Color purity can be optimized.

The adjustment of the B color is based on the same principle as above,
This is performed by adjusting the angle of the dichroic mirror 6B. In this case, the B transmission filter 1 is used as the color separation filter 10.
Using 0B, the raster display on the LCD panel 8 is an R / G display having a complementary color relationship with the B color to be adjusted. And L
Pixel P _R other than B pixels P _B in the pixel substrate 81 of CD panel 8, by B leakage light of the sum that has passed through the P _G adjusts the dichroic mirror 6B so as to minimize, adjacent to the B pixel P _B R pixel P _R and G pixel P _G
, The levels of the B leakage light that have passed through each of them are equalized, the color balance can be improved, and the color purity of the G and R colors can be optimized.

Next, the effect of the color adjustment method in the present embodiment will be described in comparison with other conceivable color adjustment methods.

[Effects of Color Adjustment Method in the Present Embodiment] In the single-panel CF-less color liquid crystal projector as shown in FIG. 1, in principle, the following two methods are considered in addition to the above method. Can be

(1) Only one B, R, G dichroic mirror is incorporated in the apparatus body (single-plate CF-less color liquid crystal projector), and a monochromatic raster display of a certain color other than the dichroic mirror (for example, dichroic mirror 6G) Is adjusted (B raster display), the amount of color light (here, G light) to be adjusted that has passed through the pixel of the color (here, B pixel) that is displaying the raster is measured. Next, after a single-color raster display (here, R raster display) of another one color is set, the color light (here, G pixel here) to be adjusted that has passed through the pixel (here, R pixel) of the color that is performing the raster display. Light). Then, the dichroic mirror 6G is adjusted so that each measured value becomes minimum and both measured values become equal. Then, such adjustment is sequentially performed for each dichroic mirror.

(2) After assembling the three dichroic mirrors into the apparatus main body, the color to be adjusted (for example, G)
Is performed (G raster display), and the dichroic mirror 6G to be adjusted is adjusted in this state. Then, adjustment is performed so that the amount of G light emitted from the LCD panel is maximized. This adjustment is sequentially performed for each dichroic mirror.

However, each of the above two methods has the following disadvantages. That is, in the method (1), a signal for driving the pixels of the LCD panel (a driving signal for monochromatic raster display) must be switched for each dichroic mirror, and time is required for replacing the dichroic mirror. Cost. Therefore, the workability is extremely poor and the mass productivity is poor.

When the adjustment is performed by the method (2),
Since light is incident on the LCD panel from an oblique direction, the dichroic mirror position when the amount of light passing through the pixel to be adjusted is maximized is equal to the amount of leaked light in pixels adjacent to both sides of the pixel to be adjusted. Does not always coincide with the dichroic mirror position. For this reason, even if such an adjustment is made, the color purity is significantly reduced.

On the other hand, in the color adjusting method according to the present embodiment, three dichroic mirrors 6B, 6R, 6G
Can be adjusted for all dichroic mirrors in a state where all the dichroic mirrors are incorporated, and it is not necessary to switch the raster display drive signal during the adjustment of each dichroic mirror. For this reason, workability is extremely good,
Suitable for mass production. In addition, in the color adjustment method according to the present embodiment, if the dichroic mirror is adjusted so that the sum of the amounts of leaked light in the pixels adjacent to both sides of the adjustment target pixel is minimized, the amount of leaked light in the pixels adjacent to both sides is reduced. Since they can be made equal to each other, adjustments can be made to ensure a sufficient color reproduction range and color purity, and image quality can be improved.

Although the present invention has been described with reference to the embodiment, the present invention is not limited to this embodiment, and can be variously modified within an equivalent range. For example, in each of the above-described embodiments, an LCD panel in which a TFT for driving a pixel electrode is disposed on the pixel substrate side has been described as an example, but an LC panel in which this TFT is disposed on the counter substrate side is described.
The adjustment method of the present invention can be applied to the D panel. Further, the adjusting method of the present invention can be applied to an LCD panel using a member other than the microlens as a light collecting member as long as it has a light collecting function.

Further, in the present embodiment, the average illuminance is obtained by using the integrating sphere. However, the present invention is not limited to this, and may be performed by using a diffusion plate.
This case is advantageous in that the space required for adjustment can be reduced as compared with the case of an integrating sphere. Further, an illuminometer may be directly arranged at some places (center, four corners, etc.) on the projection screen without using an integrating sphere or a diffuser, and measurement may be performed. However, in this case, since the brightness unevenness (hot spot) of the display screen fluctuates due to the rotation adjustment of the dichroic mirror, a measurement error may occur.
On the other hand, when an integrating sphere or a diffuser is used, the average illuminance of all the luminous fluxes can be obtained, so that the fluctuation of the hot spot on the display screen can be offset, and the adjustment over the entire display area is advantageous. It is.

Further, in the present embodiment, the plurality of basic colors for color display are described as three primary colors of red, green, and blue. However, the present invention is not limited to this, and for example, cyan (C),
Three colors of magenta (M) and yellow (Y) may be adopted as basic colors.

Further, in this embodiment, the case where the means for modulating the intensity of each of the B, R, and G color lights is a liquid crystal panel has been described, but the present invention is not limited to this.
The present invention can be similarly applied to a color image display device using other types of elements.

[0047]

As described above, according to the color adjusting method of the color image display device according to the first to sixth aspects, not the pixel for the color to be adjusted but the both sides adjacent to each other in a complementary color relationship with the pixel. The color light to be adjusted, which has passed through the pixel, is measured as leakage light, and the dichroic mirror for the color is adjusted based on the level of the leakage light. Can be adjusted, and only one type of raster display is required during the adjustment of each dichroic mirror, and there is no need to switch the raster display drive signal. Therefore, there is an effect that the color adjustment work at the time of mass production can be simplified and the number of manufacturing steps can be reduced.

In particular, according to the color adjusting method of the color image display device of the present invention, since the dichroic mirror is adjusted so that the total amount of light is minimized, the adjustment target point is clear. Adjustment work is easy.
In addition, when the sum of the light amounts is minimized, the level of light leaked to the pixel having a complementary color relationship with the adjustment target pixel (pixels adjacent to both sides) becomes substantially equal, so that the color reproduction range and color purity are sufficiently ensured. Such adjustment is possible, and there is an effect that image quality can be improved.

Further, according to the color adjusting method of the color image display device of the present invention, the total amount of light is measured by using an integrating sphere or a diffusing plate. Can be adjusted in the entire display area where the fluctuation of the image is canceled. In particular, when a diffusion plate is used, there is an effect that a work space can be reduced.

[Brief description of the drawings]

FIG. 1 is a device layout diagram for explaining a color adjusting method of a color image display device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view illustrating the structure and operation of the LCD panel in FIG.

FIG. 3 is a diagram for explaining a color adjustment method of the color image display device according to one embodiment of the present invention.

FIG. 4 is a diagram showing how the total sum of R leaked light is related to the intensity ratio between R leaked light passed through a G pixel and R leaked light passed through a B pixel.

[Explanation of symbols]

2 white light source, 3 integrator, 4 relay lens, 5 collimator lens, 6B, 6R, 6G dichroic mirror, 7 LCD drive device, 8 LCD panel, 9 projection lens, 10 color separation filter, 11 integrating sphere, 12 optical sensor, 13 illuminometer, 81 pixel substrate, 81a glass substrate, 81b black matrix portion, 81B, 81R, 81G, pixel electrode, 82 counter substrate, 82a glass substrate , 82b: microlens (light collecting member), 82c: cover glass, 82d: counter electrode, 100: single-plate CF-less color liquid crystal projector

Claims (6)

[Claims] 1. A pixel which is provided corresponding to each of a plurality of colors which are the basis of a color display and modulates color light transmitted therethrough in accordance with an image signal for the color, and a pixel which is commonly provided for each of the plurality of pixels. And a plurality of dichroic mirrors for color-separating white light into a plurality of color lights that are the basis of the color display, and the common light-collecting member converts each color light color-separated by the dichroic mirror. In the color image display device in which the light emitted from the light condensing member is distributed and made incident on the pixels for each color, only the pixels for colors having a complementary color relationship with one color light are emitted. A color image table comprising: measuring a total amount of light of the one color light that has passed, and adjusting an angle of a dichroic mirror for color-separating white light into the one color light based on the measurement result. Color adjustment method of the device. 2. The color adjustment method for a color image display device according to claim 1, wherein an angle of a dichroic mirror for color-separating the one color light is adjusted so as to minimize the sum of the light amounts. 3. The color separation filter separates only the one color light from all the colors of light that have passed through only the color pixels that have a complementary color relationship with the one color light, and determines the amount of the separated one color light. 2. The color adjustment method for a color image display device according to claim 1, wherein the measurement is performed. 4. A method according to claim 1, wherein the plurality of colors that are the basis of the color display are red,
3. A color filter comprising three primary colors of green and blue.
The color adjusting method of the color image display device described in the above. 5. The color adjusting method for a color image display device according to claim 1, wherein the measurement of the sum of the light amounts is performed using an integrating sphere. 6. The color adjustment method for a color image display device according to claim 1, wherein the measurement of the total amount of light is performed using a diffusion plate.