Liquid crystal display element with gap controlling material and process for production thereof
First Claim
1. In a liquid crystal display element comprising a pair of transparent substrates, electrodes formed on the individual surfaces thereof facing each other, a liquid crystal material layer held between the substrates, and a gap controlling material for keeping the gap between said substrates, the improvement wherein said gap controlling material is a solid dispersed and fixed in an insulating coating film formed on at least one of said substrate surfaces.
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Abstract
This invention relates to a liquid crystal display element comprising a pair of transparent substrates, electrodes formed on the individual surfaces thereof facing each other, a liquid crystal material layer held between the substrates, and gap controlling material for keeping the gap between the substrates, and is characterized in that the gap controlling material is dispersed and fixed on the substrate surface by an insulating coating film such as an orientation controlling film.
When the gap controlling material is thus dispersed and fixed, it does not move between the substrates, and hence the change of the gap length between the substrates is prevented, so that there can be obtained a liquid crystal display element in which the distance between the substrates is uniform. Moreover, when the insulating coating film is an orientation controlling film, the dispersion and fixation of the gap controlling material is completed simultaneously with the formation of the orientation controlling film, so that beneficial effect can be obtained also with respect to working efficiency.
When the gap controlling material is a combination of a polymer solid and an insulating material having a higher softening point and regidity than those of the polymer solid, the uniformalization and change prevention of the gap length are more effectively achieved.
51 Citations
28 Claims
- 1. In a liquid crystal display element comprising a pair of transparent substrates, electrodes formed on the individual surfaces thereof facing each other, a liquid crystal material layer held between the substrates, and a gap controlling material for keeping the gap between said substrates, the improvement wherein said gap controlling material is a solid dispersed and fixed in an insulating coating film formed on at least one of said substrate surfaces.
- 15. In a liquid crystal display element comprising a pair of transparent substrates at least one of which is a flexible thin plate, electrodes formed on the individual surfaces thereof facing each other, a liquid crystal material layer held between the substrates, and a gap controlling material for keeping the gap between said substrates, the improvement wherein said gap controlling material contains a polymer solid and an insulating material having a higher softening point and rigidity than does the polymer solid and is dispersed and fixed in an insulating coating film formed on the surface of at least one of the substrates.
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20. In a process for producing a liquid crystal display element comprising a step of coating individual surfaces of electrodes formed on individual transparent substrates with a resin solution of a raw material for forming an orientation controlling film;
- a step of drying the resulting coatings to form a resin film on individual substrates;
a step of rubbing individual resin films to give orientation controlling films;
a step of piling a plurality of the thus treated substrates one after another so as to make individual electrode forming surfaces face each other;
a step of sealing each periphery of spaces between the substrates immediately after or simultaneously the step of piling the substrates; and
a step of enclosing a liquid crystal material in each sealed space between the substrates followed by sealing the opening, the improvement which comprises coating the resin solution dispersing a gap controlling material therein on at least one of the substrates. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
- a step of drying the resulting coatings to form a resin film on individual substrates;
Specification