Method of manufacturing liquid crystal display device
View Patent ↗A method of manufacturing a liquid crystal display device having good display quality, includes defoaming a liquid crystal composition having a mixture of liquid crystal and a polymerizable component to be polymerized by light or heat; dropping or transferring the liquid crystal composition onto one substrate; and attaching the one substrate and another substrate together in vacuum, and filling the liquid crystal composition therein by returning vacuum back to the atmospheric pressure. A polymerizing step polymerizes the polymerizable component.
1. A method of manufacturing a liquid crystal display device, comprising:
a first step of defoaming a liquid crystal composition having a mixture of liquid crystal and a polymerizable component to be polymerized by light or heat;
a second step of dropping or transferring the liquid crystal composition onto one substrate;
a third step of attaching the one substrate and a second substrate together in vacuum, and filling the liquid crystal composition therein by returning vacuum back to the atmospheric pressure; and
a fourth step of polymerizing the polymerizable component and forming a polymer;
wherein the polymer formed near surfaces of the one and second substrates regulates a direction of alignment and a pre-tilt angle of liquid crystal molecules.
2. A method of manufacturing a liquid crystal display device according to claim 1 , wherein the second step is effected after the first step.
3. A method of manufacturing a liquid crystal display device according to claim 2 , wherein the defoaming step is effected while decreasing the atmosphere surrounding the liquid crystal composition down to a predetermined pressure.
4. A method of manufacturing a liquid crystal display device according to claim 3 , wherein the predetermined pressure is not higher than 1 Torr.
5. A method of manufacturing a liquid crystal display device according to claim 2 , wherein in the second step, the liquid crystal composition is dropped from a height of not larger than 20 mm above the one substrate.
6. A method of manufacturing a liquid crystal display device according to claim 1 , wherein the first step is effected after the second step.
7. A method of manufacturing a liquid crystal display device according to claim 6 , wherein the first step effects the defoaming treatment while decreasing the atmosphere surrounding the liquid crystal composition down to a predetermined pressure, and a step is interposed between the first step and the third step for returning the atmosphere surrounding the liquid crystal composition back to near the atmospheric pressure.
8. A method of manufacturing a liquid crystal display device according to claim 7 , wherein the predetermined pressure is not higher than 1 Torr.
9. A method of manufacturing a liquid crystal display device according to claim 6 , wherein the first step effects the defoaming treatment while heating the liquid crystal composition at a predetermined temperature.
10. A method of manufacturing a liquid crystal display device according to claim 9 , wherein the predetermined temperature is not lower than 50° C.
11. A method of manufacturing a liquid crystal display device according to claim 9 , wherein the predetermined temperature is not higher than 150° C.
12. A method of manufacturing a liquid crystal display device, comprising:
a first step of dropping or transferring a liquid crystal composition having a mixture of liquid crystal and a polymerizable component to be polymerized by light or heat onto one substrate;
a second step of attaching the one substrate and a second substrate together in an atmosphere of a predetermined pressure in which the liquid crystal composition does not foam, and filling the liquid crystal composition therein by returning the pressure back to the atmospheric pressure; and
a third step of polymerizing the polymerizable component.
13. A method of manufacturing a liquid crystal display device according to claim 12 , wherein the predetermined pressure is not lower than 1 Torr but is lower than the atmospheric pressure.