JPH06250170A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide a liquid crystal display device by which efficiency for utilizing light is enhanced and in which the increase in the number of manufacturing process of a liquid crystal panel and thereby the lowering in yield are prevented. CONSTITUTION:In the liquid crystal display device in which a light source 1 for emitting light in a plane shape and a liquid crystal panel 9 above the light source 1 are arranged; subsequently from the bottom between the light source 1 and the liquid crystal panel 9, a tin film mirror 6 having a minute opening part 6a, color filters 7a, 7b, 7c covering the minute opening part 6a, and a substrate 8 for a micro lens array having a large number of microlenses 8a are arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device,
In particular, the present invention relates to a liquid crystal display device capable of color display, which is capable of improving the utilization efficiency of light and increasing the yield of liquid crystal panels.

[0002]

2. Description of the Related Art Generally, in a liquid crystal display, since the liquid crystal panel itself does not emit light, the brightness is increased by irradiating light from the back, and as a backlight for irradiating the liquid crystal panel with light from the back. , Flat lamps, reflector type, light guide type, etc.

In order to improve the resolution, the above liquid crystal panel is provided with a light shielding portion called a black matrix portion between the openings arranged in a matrix.

Further, in the color liquid crystal display, a color filter for covering each opening is attached to the liquid crystal panel, and in this case, each opening is covered with color filters of different colors in order.

[0005]

By the way, the black matrix portion can be made thinner as the parallelism of light incident on the liquid crystal panel is higher. If the numerical aperture is increased to achieve this, the aperture ratio will decrease, and most of the light may be wasted.

Further, in the case of a color liquid crystal panel, since an aperture for each color is required for each pixel, the number of pixels becomes, for example, one-third of the numerical aperture, which lowers the resolution and causes color filters to be provided in each aperture. As a result, the number of manufacturing steps of the liquid crystal panel is increased and the yield is reduced.

The present invention has been made in view of the above circumstances, and it is possible to improve the light utilization efficiency of a liquid crystal panel and prevent an increase in the number of manufacturing steps of the liquid crystal panel and a reduction in yield due to this. An object of the present invention is to provide a liquid crystal display device capable of color display.

[0008]

In order to achieve the above object, the present invention provides a light source device which emits light in a plane and a liquid crystal display device in which a liquid crystal panel is arranged above the light source device and the liquid crystal panel. A thin film mirror having a minute opening in order from the bottom, a color filter covering the minute opening, and a microlens array substrate having microlenses arranged at positions corresponding to the minute opening are arranged. Is characterized by.

[0009]

In the present invention, the thin film mirror is formed on the surface of the light source by a thin film forming method such as vapor deposition, sputtering, or ion plating of a highly reflective substance such as aluminum. Light except the light passing through is reflected irregularly by this thin film mirror,
It is reflected again at the light emitting portion of the light source.

Then, by repeating the reflection at the thin film mirror and the reflection at the light emitting portion of the light source, the light passes through the minute opening and is emitted to the liquid crystal panel side, whereby the aperture ratio of the minute opening is increased. Despite being small, the amount of emitted light is amplified and the light utilization rate is increased.

Further, the light emitted from each minute opening passes through a color filter covering each minute opening and is converted into light of each color of R, G, B simultaneously or sequentially, for example.
Color display can be performed by making the converted light enter a liquid crystal panel that simultaneously or sequentially modulates the light intensity of each color of RGB.

Further, although the light emitted from each minute opening is scattered to some extent, it is incident on each microlens corresponding to each minute opening to be converged, thereby reducing the resolution due to optical noise. This can be prevented, and particularly when the light is converged by the respective microlenses to the respective openings of the liquid crystal panel, the light utilization efficiency can be further enhanced.

In addition, since a black and white liquid crystal panel without a color filter formed therein can be used as the liquid crystal panel, the number of manufacturing steps of the liquid crystal panel does not increase.
Therefore, it is possible to eliminate the occurrence of defective products due to, for example, defective mounting of color filters, and it is possible to improve the yield of liquid crystal panels.

In the present invention, the minute openings, the microlenses, and the color filters may correspond to each other in one-to-one correspondence. In particular, a plurality of color filters having different colors are provided for each minute opening of the thin film mirror. A means for forming images of different colors sequentially on the liquid crystal panel and moving the plurality of color filters so that the color filters of the colors corresponding to the images of the respective colors formed on the liquid crystal panel are located in the minute openings. Can display images of multiple colors in a time-division manner with one minute aperture, and each aperture of the liquid crystal panel can also be used to display each color, so that the number of pixels of the color image is the same as that of the liquid crystal panel. can do.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display according to an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in the sectional view of FIG. 1, a light source 1 of this liquid crystal display device is composed of a cold cathode type flat fluorescent lamp adopting a hollow cathode, and a front glass panel arranged vertically with a proper interval. 2, a back glass panel 3, and a glass housing including a glass peripheral wall that connects these peripheral portions in a sealing manner.

Fluorescent films 4 and 5 are coated on the lower surface of the front glass panel 2 and the upper surface of the rear glass panel 3 so that electrons discharged between the discharge electrodes provided at both ends in the glass housing are fluorescent films. The light is emitted in a plane by colliding with 4.5.

On the upper surface of the light source 1, there is formed a thin film mirror 6 having a large number of minute openings 6a formed at predetermined intervals in the front-rear direction and the left-right direction. It is formed by attaching by a thin film forming method such as sputtering or ion plating.

On the upper side of the thin film mirror 6, a color filter 7 having a red filter 7a, a green filter 7b and a blue filter 7c which covers the minute opening 6a.
Are placed. The red filter 7a, the green filter 7b, and the blue filter 7c are arranged so as to sequentially cover the minute openings 6a in the front-rear direction and the left-right direction.

Further, on the upper side of the color filter 7, a large number of microlenses 8 arranged in a matrix at positions corresponding to the positions of the minute openings 6a and the red filters 7a, green filters 7b or blue filters 7c.
A microlens array substrate 8 having a is arranged.

A liquid crystal panel 9 is arranged above the microlens array substrate 8, and inside the liquid crystal panel 9, the minute openings 6a, the red filters 7a, and the green filters 7 are provided.
A mask 10 having an opening 10a opened at a position corresponding to the position of b or the blue filter 7c and the microlens 8a and the liquid crystal layer 11 are provided.

In this liquid crystal display device, the light emitted from the light source 1 is directly emitted from the minute opening 6a of the thin film mirror 6 as shown by arrows A and B in FIG. After repeating diffused reflection between the fluorescent surfaces 4 provided on the inner surface of the front panel 2, the light is emitted from the minute opening 6a of the thin film mirror 6 to the liquid crystal panel 9 side. In this way
The light utilization rate is enhanced by amplifying the amount of light emitted from the minute opening 6a.

All the light emitted from the minute opening 6a is red filter 7a, green filter 7b or blue filter 7c.
After being converted into red light, green light or blue light, the light enters the corresponding microlens 8a.

Since each microlens 8a collects the incident light in the corresponding opening 10a of the liquid crystal panel 9,
Eventually, all the light emitted from the light source 1 enters the respective openings 10a of the liquid crystal panel 9, and the light utilization rate is further increased.

The red light, the green light or the blue light that has passed through the opening 10a of the liquid crystal panel 9 is reflected by the liquid crystal layer 1 of the liquid crystal panel 9.
It is light-modulated by 1 to form a red image, a green image or a blue image, and thereby a color image in which the red image, the green image and the blue image are combined is obtained.

In this embodiment, the red filter 7a,
When the green filter 7b and the blue filter 7c are configured by a multilayer interference filter, unnecessary light other than light that passes through the red filter 7a, the green filter 7b and the blue filter 7c, and enters the corresponding opening 10a through the corresponding microlens 8a. Light, that is, the incident angle to the red filter 7a, the green filter 7b, or the blue filter 7c after passing through the minute opening 6a is large, and does not enter the corresponding opening 10a, but enters the black matrix portion 10b of the mask 10. The reflected light is reflected to the light source 1 side by the red filter 7a, the green filter 7b, and the blue filter 7c, so that the light utilization efficiency is further enhanced.

In the liquid crystal display device according to the above embodiment,
One red filter 7a, one green filter 7b, or one blue filter 7c for one minute opening 6a of the thin film mirror 6.
Further, one opening 10a of the liquid crystal panel 9 is provided for each minute opening 6a of the thin film mirror 6.

However, in the liquid crystal display device according to another embodiment of the present invention shown in the sectional view of FIG. 2 and the operation explanatory diagram of FIG. 3, the color filter 12 is provided for one minute opening 6a.
Color filters of multiple colors, namely red filter 1
2a, green filter 12b and blue filter 12c are 1
Liquid crystal layer 11 of liquid crystal panel 9
Are sequentially controlled to form a red image, a green image or a blue image.

The red filter 12a, the green filter 12b and the blue filter 12c are temporally sequentially arranged in the red filter 12a corresponding to the image color of the liquid crystal panel 9,
Means is provided for moving the green filter 12b or the blue filter 12c to a position covering the minute opening 6a.

Further, a plurality of openings 10a of the liquid crystal panel 9, for example, three openings 10a are formed for one minute opening 6a.

In the liquid crystal display device according to this embodiment, the light of the light source 1 emitted from the minute opening 6a of the thin film mirror 6 to the liquid crystal panel 9 side is a red filter 7a which is temporally selected.
The light passes through the green filter 7b or the blue filter 7c, is converted into a single color, is converted into substantially parallel light by the microlens 8a, and is emitted to the plurality of openings 10a corresponding to the respective minute openings 6a. The color of the light incident on each opening 10a corresponds to the color of the image formed by the liquid crystal layer 11, so that the red image, the green image, and the blue image are displayed in a time-division manner, and these are visually combined. By doing so, it is observed as a color image.

In this case, the minute opening 6a of the thin film mirror 6
Does not have to match the pitch of each pixel of the microlens 8a and the liquid crystal panel 9, and since each pixel of the liquid crystal panel 9 is also used for image display of each color, the number of pixels is 1/3. It is not necessary to reduce the number of pixels, and it is possible to perform high-definition and high-resolution color display with three times the number of pixels as compared with the conventional color liquid crystal display device.

Since the other construction, operation and effect of this embodiment are the same as those of the above-mentioned one embodiment, detailed description thereof will be omitted to avoid duplication.

In the liquid crystal display device according to another embodiment of the present invention, as shown in the sectional view of FIG. 4, the pitch of the openings 10a of the liquid crystal panel 9 is set to the minute openings (6) of the thin film mirror 6.
a) and the pitch of the microlenses 8a are matched, and the light emitted from the minute apertures 6b corresponding to each microlens 8a is directed to the corresponding aperture 10a of the liquid crystal panel 9.
The configuration is the same as that of the other embodiment of the present invention shown in FIGS. 2 and 3, except that the configuration is made to converge to.

In this embodiment, the light that enters the liquid crystal panel 9 from the microlens 8a enters the openings 10a without being absorbed by the black matrix portion 10b, so that the light utilization efficiency is higher than that in the previous example. Get higher

The other operations and effects of this embodiment are the same as those of the previous example, so detailed description thereof will be omitted to avoid duplication.

In each of the above-mentioned embodiments, the directivity of the light incident on the liquid crystal panel 9 is high, so that the liquid crystal panel 9
However, this can be solved by disposing a thin diffusion plate on the light emission surface of the liquid crystal panel 9 or roughening the front panel of the liquid crystal panel.

[0038]

As described above, according to the present invention, in a light source device which emits light in a plane and a liquid crystal display device in which a liquid crystal panel is arranged on the upper side thereof, a thin film mirror having a minute opening is provided on the upper side of the light source. By arranging it, the light emitted to the liquid crystal panel side can be amplified, and thus the light utilization rate can be increased.

Further, the light emitted from each minute opening passes through a color filter covering each minute opening and is converted into light of each color of R, G, B simultaneously or sequentially, for example.
Color display can be performed by making the converted light enter a liquid crystal panel that simultaneously or sequentially modulates the light intensity of each color of RGB.

Furthermore, by scattering the light emitted from each minute opening to some extent and making the light incident on the microlens to be converged, it is possible to prevent the resolution from being deteriorated due to optical noise. In the case of converging on, the light utilization efficiency can be further enhanced.

In addition, since a black and white liquid crystal panel without a color filter formed therein can be used as the liquid crystal panel, a liquid crystal display device capable of color display can be obtained without increasing the number of manufacturing steps of the liquid crystal panel. Therefore, it is possible to increase the yield of the liquid crystal panel and reduce the manufacturing cost by eliminating the generation of defective products due to, for example, defective mounting of the color filter.

In the present invention, a plurality of color filters having different colors are provided for one minute opening of the thin film mirror, and means for forming images of different colors on the liquid crystal panel are formed in the liquid crystal panel. When a means for moving the plurality of color filters so that the color filters of the colors corresponding to the images of the respective colors are located in the minute openings, since each opening of the liquid crystal panel is also used for displaying each color, As compared with the conventional color liquid crystal display device, it is possible to display a high-definition color image with three times the number of pixels and high resolution.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a sectional view schematically showing a liquid crystal display device according to another embodiment of the present invention.

FIG. 3 is an operation explanatory diagram of a liquid crystal display device according to another embodiment of the present invention.

FIG. 4 is a sectional view schematically showing a liquid crystal display device according to another embodiment of the present invention.

[Explanation of symbols]

 1 Light Source 6 Thin Film Mirror 6a Micro Aperture 7 Color Filter 7a Red Filter 7b Green Filter 7c Blue Filter 8 Microlens Array Substrate 8a Microlens 9 Liquid Crystal Panel 10a Aperture 12 Color Filter 12a Red Filter 12b Green Filter 12c Blue Filter

Claims (2)

[Claims] 1. A light source that emits light in a plane, and a liquid crystal display device in which a liquid crystal panel is arranged above the light source, a thin film mirror having a minute opening between the light source and the liquid crystal panel in order from the bottom, A liquid crystal display device comprising: a color filter covering a minute opening; and a microlens array substrate having a large number of microlenses. 2. A means for forming images of different colors on a liquid crystal panel sequentially by providing a plurality of color filters of different colors to one minute opening of the thin film mirror, and an image of each color formed on the liquid crystal panel. 2. The liquid crystal display device according to claim 1, further comprising means for moving the plurality of color filters so that the color filters of the colors corresponding to are located in the minute openings.