JPS6051819A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To enhance display contrast by rendering the space between both bases in the part in which both electrodes face each other larger than the space between both bases in the other part in a guest-host type color liquid crystal display element. CONSTITUTION:A mixture of liquid crystals 9 and a dichroic dye 10 having the max. absorption spectra in the long axis direction of the molecule is filled between a pair of bases 1, 5 each provided with electrodes 4, 6, respectively, and tightly enclosed to form a guest-host type liquid crystal display element. An intended liquid crystal dispay element is obtained by forming recesses 12 by etching the insulatng film 3 of the constituent of the base 1, installing the elelctrodes 4 in the recesses 12, and making the space between the electrodes 4, 6 facing each other, larger than the space between both bases 1, 5 in the other part 11b. As a result, coloring to the dichroic dye 10 can be suppressed.

Description

[Detailed Description of the Invention] Technical Field, Object of the Invention The present invention relates to a liquid crystal display element, and in particular, a liquid crystal (host) and a dichroic dye (guest) are formed in a sealed space between a pair of opposing substrates with electrodes formed thereon. ), the purpose of which is to improve the display contrast of the liquid crystal display element. Explain.

The figure is a cross-sectional view of one embodiment of the present invention, showing a state in which an electric field is applied to a so-called positive guest-host liquid crystal display element. Substrate 1 is glass substrate 2” and S i 02 + S i3N
An insulating film 3 made of 4°TiOz, polyimide, etc. is broken down, and a transparent conductive film is applied on this insulating film 3 to form an electrode 4. On the substrate 5 facing the substrate 1, a transparent conductive film is applied to form an electrode 6. The peripheral edges of the sub-substrates 1 and 5 are sealed with a seal 7, and in the sealed space 8 formed between the sub-substrates 1 and 5, a liquid crystal 9 and a dichroic material having a maximum absorption spectrum in the long direction of the molecules are formed. The dye 10 mixture is sealed.

In such a positive guest spot liquid crystal display element, if the gap between the sub-substrates 1.5 is made large, the dichroic dye 10 in the portion 11a where the electrodes 4 and 6 are opposed to each other when an electric field is applied is Since the long sleeve of 2 is along the direction of electric field application, the above part
At the same time, the dichroic dye I becomes darker in the remaining portion 11b where the electrodes 4 and 6 are not facing each other.
O minute r-'t, Fj 4ql+ direction absorption subek! The color tone is dark due to the color of the pot, so it cannot be said that the overall contrast is good.

According to the invention, insulating film 3 J. = is formed with a recess 12 along the shape of letters, numbers, etc. to be displayed/in other words, by etching processing, and the recess 7η]'1
An electrode 4 is provided within the electrode 12 so as to form a step inward from the surface 3 a of the insulating film 3 . Hence electrode 4.

The gap t1 between the both end plates 1.5 which is placed on the opposing portion 11a is the gap IM1 between the substrates 1 and 5 in the remaining portion 111].
2 is also considered to be a dog, thereby making it possible to suppress the coloring caused by the absorption spectrum of the dichroic dye IO in the short axis direction of the molecule in the remaining portion 11b. Therefore, the portion 11 where both electrodes 4 and 6 face each other when an electric field is applied
21 and electrode 4.

The display contrast with the remaining portion Ill) to which 6 is not opposed is improved.

As another embodiment of the present invention, instead of providing the insulating film 3 in the above embodiment, four parts may be formed on the electrically insulating glass substrate 2 by etching, and the electrodes 4 may be provided in the recesses.

In the above embodiment, the gap t1, 12 between the bases 1, 5
varies depending on the use of the display device, but considering response characteristics etc., lIff+ O-20/Lm. , ital 2 f
It is preferable to set it as 5-15 micrometers.

<Effects of the Invention> As described above, according to the present invention, electrodes are formed to face each other.
In a liquid crystal display element in which a mixture of liquid crystal and a dichroic dye having a full absorption spectrum with a large Il gain is sealed between the pair of substrates in the long direction of the molecules, the gap between the two fiber plates in the part where the electrodes are opposed to each other is Since the gap is made larger than the gap between the two thread plates in the remaining part where the electrodes are not opposed, it is possible to improve the display contrast between the part where the electrodes are opposed to each other and the remaining part. , accordingly an overall clear display can be realized.

[Brief explanation of the drawing]

The figure is a sectional view of one embodiment of the present invention. 1, 5...Substrate, 4.6...Electrode, 9...Liquid crystal, 1
0... Dichroic dye, Ila... Electrodes 4 and 6 are facing 7J/this part, 111]... Residual 1<11 minutes where electrodes 4 and 6 are not facing ZJ, t+, 12 ...Both end plates 1.5
The gap between. .

Claims (1)

[Claims] 1. A liquid crystal display element in which a mixture of a liquid crystal and a dichroic dye having a maximum absorption spectrum in the direction of the long axis of the molecules is sealed between a pair of substrates facing each other in a fully formed manner,
A liquid crystal display element characterized in that a gap between both thread plates in a portion where both electrodes face each other is narrower than a gap between both thread plates in the remaining portion.