JPS59198490A - Liquid crystal display element - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device which has significantly improved image quality by forming at least one surface (j'1) of fine particles.

Regarding the multicolor liquid crystal display element which is the subject matter of the present invention d:
Regarding the inventions No. 1 and Transmission No. 11 to 11 which were previously invented by the present inventors, they were disclosed in Japanese Patent Application No. 56-201987 (title of invention [Method for manufacturing multi-color image display device]). As for the items, the special application was made on the same day in 1982.
No. (name of the invention "reflective multicolor liquid crystal display element"),
For understanding of the present invention, which has been patented,
These days/il! 0 Invention A (Explaining the removal.

In a transmissive multicolor liquid crystal display element, as shown in FIGS. 1 and 2, a pair of substrates (21) are arranged parallel to each other, and a large number of fine electrodes (21) are arranged on the opposite surfaces thereof. On one side of the electrode (221), red (b), green (q,
fi' (A color filter layer t23j that deviates from the three primary colors of light of 131 is formed) γ. Then, a pair of parallel substrates (21) and 11 wings: JR has a liquid crystal 12AI ) is injected, and its Jl';, i A
The n part is a seal 4:J that also functions as a spacer.
(Sealed with 2:il.The multicolor image display section (d2, consisting of a large number of micro regions (11) corresponding to the so-called iiiI+j elements of the original image, each micro region 01) is
It has three color filter layers: red (T-wax) and green ((J3).

In the multicolor liquid crystal display element configured in this manner, a predetermined voltage is applied between each electrode (no and liquid crystal e4) on which a color filter layer is formed and the electrode (two electrodes) facing each other. In this case, the transmitted light amount or reflected light amount of the liquid crystal (2a) is controlled, and as a result, a multicolor image is displayed on the substrate (21).
This is what is displayed above.

As shown in FIGS. 3 and 4, the reflective multicolor liquid crystal display element also uses a 4'Fl structure similar to that of the transmissive type. In FIG. 3 and FIG. 1, parts corresponding to the parts shown in FIGS. 1 and 2 are indicated by the same reference numerals with a ``''' added thereto.

In the case of the reflective type, the structure is generally the same as that of the transmissive type, except that a transparent electrode (n'' on one side of 2z is the reflective electrode e2).

Now, in these multicolor liquid crystal display elements, the substrate (2
++ Since (2]) is made of transparent plates such as glass plates, light from inside and outside is reflected on these substrate surfaces,
C may impair contrast or cause discomfort to the eyes.

In view of the drawbacks of the conventional multicolor liquid crystal display elements, the main object of the present invention is to substantially avoid the reflection of unnecessary light!
The object of the present invention is to provide a liquid crystal display element having the following characteristics.

The object of the present invention is to provide a cage crystal display element with:
No. J is obtained by coating at least one surface of at least one of the substrates with fine particles 4J+ over the entire surface thereof.

In this way, by forming the fine particle rough surface, unnecessary reflection of light from inside and outside is suppressed, causing no discomfort to the eyes, and further smoothing the additive color mixing. becomes. Furthermore, in the case of a transmissive liquid crystal display 2, the effect of promoting the diffusion of light from the light source can also be obtained.

Hereinafter, preferred embodiments of the present invention will be described based on the accompanying drawings.

52] to FIG. 5d classify and show preferred embodiments of the present invention.
This is a new view. What is shown is a transmissive multicolor liquid crystal display element, but basically it is a black and white liquid crystal display element,
It is also possible to apply the present invention to reflective Jl12 liquid crystal display elements.

? In the embodiment shown in the A'tSn figure, a fine particle surface (S) is formed on the surface of the front substrate (2I). In this case, the effect of avoiding specular reflection of external light on the surface becomes remarkable. Also, 11. G
Is the additive color mixing of each B color a υ circle due to the light diffusion effect of the old 11-1 (S)? It has the effect of producing a natural color tone.

In general, if the substrate (21) is made of glass, such a rough surface (S) is exposed to hydrofluoric acid-based corrosive gas,
It can also be formed from raw liquid. The 811" surface may be processed using a polishing agent or the like.

Figure 5b shows a multicolor liquid crystal display element having a side surface (S) on the back side of the front substrate (21), and by preventing light reflection thereon, it is similar to the embodiment described in nIJ. The effect of this can be obtained. It's a color filter layer (3:
(It also has the effect of preventing the light from 11 from being unnecessarily reflected.

In this case, the thickness of the transparent electrode (22) is usually smaller than the amount of unevenness on the surface (S). The surface (21) also naturally becomes a fine grain rough surface.

In the case of FIG. 5C, the surface (S) is formed on the front surface of the substrate (21) on the back side.9. I'm here. In this case as well, the surface of the electrode (22) deposited on the rice grain surface (S) and the color filter layer C, 3) laminated on that surface also becomes rice grain rI11.

Figure 5 C1 shows 81 on the back (rear) surface of the back side board 01).
The case where 11 planes (S) are formed is shown.

This embodiment differs from the three embodiments described above, and there is almost no point in applying it to a reflective liquid crystal display element, and is generally applicable only to a transmissive liquid crystal display element. That is, the rough surface (S) diffuses the light from the light source (not shown) and does not cause discomfort to the eyes.

Needless to say, the rough surface (Sj) is not limited to one location, and any appropriate combination of the embodiments shown in FIGS. 5a to 5d can be made.

In the above explanation, there is no mention of polarizing plates, but when a TN (twisted-nematic) type liquid crystal is used, two polarizing plates become the core, and an OR (guest-host) type liquid crystal is used. In the case of using a single polarizing plate, it is not necessary to use one polarizing plate.

There are two ways to drive a liquid crystal: the well-known time-division method and the thin-film transistor method, in which a thin-film transistor is integrated with a liquid crystal display element.

In the latter case, each transistor element can be formed directly on the substrate surface, regardless of whether it is a rough or smooth surface, and can be used as an electrode as it is, but it is difficult to connect each transistor element. The gate electrode line is preferably formed by depositing At, Cr, Ag, etc. on a smooth surface. This is because if the substrate surface is not smooth, the gate electrode line will be thin, and it may not be possible to secure the threads.

Therefore, in the third case, it is preferable to make the substrate surface on which the gate electrode line is deposited a -V smooth surface. For this purpose, it is preferable to selectively etch the surface of the substrate using a suitable mask.

However, the embodiments shown in Figures 5a to 5d may be combined in any way to achieve the desired effect.

The grain size of the rough surface (S) may be appropriately selected to achieve the desired diffusion effect. The grain size of the rough surface of the fabric is preferably 1 to 10μ271.

[Brief explanation of the drawing]

FIG. 1 is a plan view schematically showing the structure of a transmissive multicolor liquid crystal display element. FIG. 2 is also a side sectional view. FIG. 3 is a plan view schematically showing a reflective multicolor liquid crystal display element. FIG. 4 is a side sectional view as well. FIGS. 5a to 5d are views similar to FIG. 2, showing an embodiment of the present invention in which the four surfaces of the substrate are made into fine grain roughened surfaces. θ [111 minute area (211 (2++ parallel substrate c + a (2no transparent electrode (22 counter electrode (, >:
tH(23) Color filter layer Q・11 C24 liquid crystal C2! i) (251 sealing material (Sll particulate surface 6) Fig. 1 Fig. 2 Fig. 3 Fig. 4 ?1'

Claims (3)

[Claims] (1) A pair of substrates arranged opposite each other, each with an electric current on the opposite surface.
．． ) < is formed. 1. In the liquid crystal display J7, in which at least one of the substrate and electrode pair is composed of a transparent substrate and a transparent electrode, and liquid crystal is filled between the side substrates, the substrate At least one side of at least one of the surfaces should have a fine grain rough surface over almost the entire surface! Characteristic LCD display (-child) (2) Liquid crystal display 4 according to claim (1), characterized in that a multicolor display is made possible by layering a plurality of color filter layers on the electrode surface. ;Child. (3) A thin film transistor is formed on one side of the substrate;
The part on the surface of the substrate where the gate electrode gland connecting between the Rancisk elements is to be formed is made smooth, and the other surface is made almost the entire surface as a surface on which fine particles are attached. The liquid crystal display element-7° according to claim (1) or (2), characterized in that: