JP2999208B2 - Liquid crystal display - Google Patents

Description

The present invention relates to a liquid crystal display, a liquid crystal shutter array,
The present invention relates to a liquid crystal panel optical system used for a liquid crystal television and the like, and particularly to an optical system suitable for a liquid crystal projector.

[Prior art] In a liquid crystal matrix array used in a liquid crystal television or the like, a liquid crystal layer having a thickness of about several μm is sandwiched between two glass substrates, and electrodes, signal lines, TFTs, and the like are formed and patterned. Produced.

The general configuration is as shown in FIG.
In the figure, 1 and 2 are glass substrates, 3 is a liquid crystal layer, 4 is a transparent electrode, 5
Is a liquid crystal window, 6 is a wiring pattern, an opaque portion such as a TFT, 7
Is illumination light.

TFT for switching each pixel is α-Si or pol
It is often made of ySi.
For example, a non-alkali material, that is, glass # 7059 manufactured by Corning Co., Ltd. for α-Si and quartz glass for poly Si are often used.

As a specific prior art, Japanese Patent Application Laid-Open No. 61-208080
JP, JP-A-57-157215 and JP-A-50-23799
Publication.

JP-A-61-208080 discloses a liquid crystal color image display device using an ultraviolet curable resin.
No. 157215 discloses a matrix display device using a mosaic lens sheet for condensing light.
Japanese Patent Application Laid-Open No. 50-23799 discloses a configuration in which a low refractive dielectric such as distilled water is interposed between a glass plate and a lens.

[Problems to be Solved by the Invention] In any of the above-described prior arts, how to bond a lens group and a glass plate facing the lens group is not described. The periphery is fastened so as to avoid the lens group.

In addition, Japanese Patent Application No. 1-74221 filed after the filing of the present application.
Japanese Patent Application Laid-Open No. 2-251902 discloses that a resin layer is provided on a lens group for flattening, and the flattened surface is bonded to an opposing glass plate with an adhesive.

[Problem to be Solved by the Invention] When a glass plate on which a lens group is formed and a glass plate facing the glass plate are overlapped and only the peripheral portion is fixed, the central portion expands. In addition, if bonding is performed after the resin layer is provided and flattened, there is no problem such as swelling of the central portion, but the adhesive layer must be provided, and refraction occurs in this adhesive layer portion, deteriorating optical characteristics. There is.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a first glass substrate having a first glass substrate as a configuration for condensing light from a light emitting source into a liquid crystal window of a liquid crystal display device. A second glass substrate formed with a large number of minute projections facing the first glass substrate and functioning as lenses on the opposite surface, and interposed between the minute projection side surface of the second glass substrate and the surface of the first glass substrate; In particular, the low refractive index medium is obtained by curing an ultraviolet curable resin, and the minute convex portion of the second glass substrate and the first glass substrate are made of the ultraviolet curable resin. Was made to adhere.

Embodiment The present invention will be described below based on the embodiment shown in FIG.

In FIG. 1, the portion of the liquid crystal display panel indicated generally by reference numeral 20 may be the same as the conventional structure in FIG.

In the present invention, the substrate 1 located on the side of the illumination light source 30 out of the pair of glass substrates 1
The second glass substrate 8 is fixedly arranged in close contact with the outer surface of the (first glass substrate). On the surface of the second glass substrate 8 on the side facing the first glass substrate 1, a plurality of minute convex portions 9 having a substantially spherical shape are formed.

The second glass substrate 8 provided with such minute projections 9 is
The minute projections 9 are closely fixed to the first glass substrate 1 via the low-refractive index medium 10 so that the positions of the minute projections 9 face the positions of the liquid crystal windows 5.

As the low refractive index medium 10, an ultraviolet curable resin material is selected. Thereby, the first glass substrate 1 is bonded to the second glass substrate 8 having the minute projections 9.

The bonding is performed by filling an uncured ultraviolet-curable resin material between the first glass substrate 1 and the second glass substrate 8 and irradiating ultraviolet rays from the outside to cure the resin.

In this case, the minute projections 9 are formed on the bonding surface of the second glass substrate 8.
However, the first glass substrate 1 may be configured with the liquid crystal panel 20 in advance, or may be in a state where the liquid crystal panel is not yet formed, that is, the glass plate alone.

In the liquid crystal display device having the above-mentioned structure, the illumination light 7 emitted from the light source 30 is refracted by each minute convex portion 9, condensed and incident on each liquid crystal window 5 facing each convex portion, and is transmitted. As a result,
The patterning of the wiring of the liquid crystal panel 20 and the illuminating light blocked by the light opaque part 6 such as a TFT part can also be transmitted to the rear through the liquid crystal window 5, so that a bright liquid crystal display device with high illumination use efficiency can be realized. .

Here, each minute projection 9 has a spherical shape with a radius of curvature R, is made of a material having a refractive index n1, and has a low refractive index medium 10
Is n2. Further, the thickness of the first glass substrate 1 is t and the refractive index is n3. At this time, if the minute convex portion 9 sets the radius of curvature R as R = (n2-n1) t / n3, the minute convex portion 9 acts as a convex lens having the surface where the liquid crystal window 5 exists as the focal plane. Thus, it is possible to improve the transmission efficiency of the illumination light as described above.

The thicknesses of the low refractive index medium 10, the transparent electrode 4, and the liquid crystal layer 3 are extremely small and can be ignored.

[Effects of the Invention] According to the present invention, since the entire surface of the glass substrate on which the minute projections are formed and the other glass substrate are bonded with an ultraviolet effect type resin, the intermediate portion may be swollen or dented. Not
In addition, since no separate adhesive layer is provided, not only the material cost can be reduced, but also problems such as refraction at the adhesive layer do not occur.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional liquid crystal display panel. 1,2 ... Liquid crystal panel glass substrate 4 ... Transparent electrode 5 ... Liquid crystal window 6 ... Impermeable part 7 ... Illumination light 8 ... Second glass substrate 9 ... Condensation convex part 10 ... Low refractive index medium 20 ... LCD panel 30 ... Illumination light source

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-61-208080 (JP, A) JP-A-57-157215 (JP, A) JP-A-2-251902 (JP, A) JP-A-2- 244123 (JP, A) Japanese Utility Model Showa 50-23799 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1335 G02B 3/00 G09F 9/00

Claims (1)

(57) [Claims] 1. A first glass substrate, a second glass substrate having a large number of minute projections facing the first glass substrate and functioning as lenses on the facing surface, and minute projections of the second glass substrate. What is claimed is: 1. A liquid crystal display device comprising a low refractive index medium interposed between a side surface and a surface of a first glass substrate, wherein the low refractive index medium is obtained by curing an ultraviolet curable resin and serves as a lens of a second glass substrate. A liquid crystal display device wherein a number of functional minute projections are bonded to a first glass substrate.