JPH05341270A - Electro-optical color display device - Google Patents

Abstract

PURPOSE:To improve the yield by providing a light collimation optical member and a color filter in the inside of an electro-optical modulating element, and providing a light scattering part for scattering an emitted light of the electro- optical modulating element. CONSTITUTION:In the rear of a liquid crystal panel 14 used as an electro-optical modulating element, a light collimation prism 11, a plate 12 with a color filter, and a phase polarizing plate 13 are installed as light collimation members, and in front thereof, the phase polarizing plate 13 and a light scattering plate 15 are installed. In this case, an emitted light from a light source 16 becomes parallel rays by the prism 11, passes through the plate 12 and the liquid crystal panel 14, and is scattered by the light scattering plate 15. In such a way, since the plate 12 is provided in the outside of the liquid crystal panel 14, the yield is improved, and also, the parallel rays for transmitting through the liquid crystal panel 14 are scattered by the light scattering plate 15, therefore, an undesirable influence is not exerted on a visual field angle of an observer 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-optical color display device represented by a liquid crystal display device.

[0002]

2. Description of the Related Art FIG. 3 shows a cross-sectional view of a liquid crystal panel of a color liquid crystal display device having a screen size of 10 inches and a size of 480.times.640 pixels in a laptop type or a notebook type.

In the figure, 31 is a phase polarizing plate, 32 is a glass substrate, 33 is a color filter, 34 is a transparent electrode, 3
Reference numeral 5 is an alignment film, 36 is a liquid crystal, and 37 is a sealing resin.

As is clear from this sectional view, R, G, B,
The color filter 33 of BL (pointing out between R, G, and B of the color filter 33 in black) is installed inside at least one of the two glass substrates 32, and also in manufacturing. In the case of such a configuration, the color filter 33 was formed on the substrate in the early stage of the manufacturing process.

[0005]

However, the structure in which the color filter is installed inside the substrate requires a smoothing process of the surface of the color filter in the manufacturing process, and an expensive fine-processed color filter is manufactured. Since it is installed in the initial stage of the process, there is a problem that the overall yield value of the entire process is greatly reduced.

Therefore, in view of the above problems, it is an object of the present invention to provide an electro-optical color display device capable of significantly reducing the yield.

[0007]

The electro-optical color display device of the present invention is provided with an optical member for optical collimation and a color filter outside the electro-optical modulation element, and the light emitted from the electro-optical modulation element is scattered. It is characterized by having a scattering section.

[0008]

The parallel light rays that have passed through the optical member for optical collimation pass perpendicularly to the installed color filter and then pass almost vertically through the liquid crystal panel to reach the light scattering portion.

In the light scattering section, the parallel rays become scattered light,
The light scattering portion acts like a light source of the three primary colors to enable color display.

[0010]

1 is a sectional view showing the constitution of a color liquid crystal display device of the present invention. A light collimating prism 11, a color filter-attached flat plate 12, and a phase polarizing plate 13 are installed as a light collimating member behind a liquid crystal panel 14 used as an electro-optical modulator, and a phase polarizing plate 13 and a light scattering plate 5 are installed in front of the liquid crystal panel 14. It is a configuration that does.

In this structure, the emitted light emitted from the light source 16 becomes parallel light by the optical collimating prism 11, passes through the flat plate 12 with the color filter and the liquid crystal panel 14, and is scattered by the light scattering plate 15. To be done.

With this configuration, the flat plate 12 with the color filter is provided outside the liquid crystal panel, so that the yield is significantly improved, and the parallel light transmitted through the liquid crystal panel 14 is scattered by the light scattering plate 15. , Does not adversely affect the viewing angle.

Although the emitted light is scattered by using the light scattering plate 15, the phase polarizing plate 13 having this function may be used.

In the embodiment of the present invention, the example in which the prism, the color filter and the phase polarizing plate are installed in this order with respect to the light source has been described, but the gist of the present invention is to install the color filter outside the liquid crystal panel for electro-optical modulation. The basic form of the device configuration is to make the incident light to the liquid crystal panel a parallel light beam by a prism, and the order of the color filter and the phase polarizing plate is from the light source to the prism, the phase polarizing plate, and the color polarizing plate. A configuration according to the order of filters or an order configuration of a phase polarizing plate, a prism, and a color filter is also possible.

Further, according to the embodiment, each constituent element is installed with a certain distance from the liquid crystal panel, but the constituent elements may be laminated.

By adopting the structure in which the light-shielding mask 18 is installed between the light source 16 and the prism 11 in FIG. 1, it is possible to obtain even better parallel light.

Further, in the embodiment, the explanation has been made by assuming the conceptual diagram of the simple matrix type as the liquid crystal panel.
It is also applicable to active matrix type represented by FT type and MIM type. As the liquid crystal panel used for the simple matrix type, TN type, STN type, ferroelectric type, antiferroelectric type, and polymer type liquid crystal can be used.

It should be noted that it is effective to increase the resolution of an image when the pitch of the prisms or the pitch of the light shielding masks is equal to or less than the pitch of the color filters, but it is not particularly limited.

(FIG. 2) shows that two prisms 21 and 22 are spatially arranged in parallel and that the two prisms 21 and 22 are
It is a conceptual diagram in the case of installing at a constant angle 23 of the pitch direction. A right-angle prism is used as the prism, but the prism is not particularly limited for collimation. Further, the optical collimating member is not limited to the optical collimating prism as long as it can obtain parallel light such as a lens.

[0020]

According to the structure of the present invention, the smoothing process of the color filter can be eliminated as compared with the conventional manufacturing process, and the reduction in the yield for using the color filter from the early stage of the manufacturing process can be reduced. The problem can be solved, and there are many advantages in manufacturing a color display device using an electro-optical modulator such as a liquid crystal panel. Also, a configuration in which each component is laminated, a configuration in which two prisms are used,
A configuration using a light shielding plate and a configuration in which the pitch of the prism is smaller than the pitch of the color filter can prevent scattered light from the surroundings and can effectively use parallel light rays, so that it has an effect of improving image resolution. is there.

[Brief description of drawings]

FIG. 1 is a sectional view showing the concept of an electro-optical color display device.

FIG. 2 is a conceptual diagram showing a relative positional relationship when two prisms are used.

FIG. 3 is a sectional view showing the concept of a conventional color liquid crystal display device.

[Explanation of symbols]

 11, 21, 22 Prism 12, 33 Color filter 13, 31 Phase polarizing plate 14 Liquid crystal panel 15 Light scattering plate 16 Light source 17 Observer 18 Light-shielding plate 23 Relative arrangement angle of two prisms 32 Glass substrate 34 Transparent electrode 35 Orientation Membrane 36 Liquid crystal 37 Seal resin

Claims (7)

[Claims] 1. In the structure of an electro-optical color display device, an optical member for optical collimation and a color filter are provided outside the electro-optical modulation element, and a light-scattering portion that scatters light emitted from the electro-optical modulation element is provided. An electro-optical color display device characterized by being provided. 2. The electro-optical color display device according to claim 1, wherein the electro-optical modulator is a liquid crystal panel sandwiched between at least two translucent substrates. 3. The electro-optical color according to claim 2, wherein the liquid crystal panel is one of TN type, STN type, ferroelectric type, antiferroelectric type, active type, and polymer type. Display device. 4. The electro-optical color display device according to claim 1, wherein the pitch of the optical members for optical collimation is equal to or less than the pitch of the color filters. 5. The structure of the electro-optical color display device according to claim 1, wherein between the optical member for optical collimation and the light source,
An electro-optical color display device having a light-shielding mask installed. 6. The electro-optical color display device according to claim 1, wherein the optical member for optical collimation is a flat prism for optical collimation. 7. A flat prism for optical collimation is used in two pieces, and these two prisms are installed so as to be spatially parallel and their pitch directions have a constant angle. Item 7. The electro-optical color display device according to item 6.