Method of manufacturing a liquid crystal display device comprising forming a plurality of spacers having compression ratios gradually increasing as advancing from a center to left and right edges of display region
View Patent ↗A liquid crystal display apparatus includes first and second substrates, a fence, a liquid crystal layer and a plurality of spacers. The first substrate includes a display region for displaying an image. The second substrate faces the first substrate. The fence is disposed between the first substrate and the second substrate. The fence surrounds the display. The spacers maintain the distance between the first and second substrates. The spacers have a gradually increasing compression ratio in a direction from a center of the display region to an edge of the display region. The liquid crystal display apparatus maintains a uniform cell gap, even though a compressive stress of a center portion of the liquid crystal display apparatus is different with a compressive stress of an edge portion of the liquid crystal display apparatus. Therefore, display quality is enhanced.
1. A method of manufacturing a liquid crystal display apparatus comprising:
forming a first substrate having a display region;
forming a second substrate;
forming a plurality of spacers on the display region of the first substrate, compression ratios of the spacers gradually increasing as advancing in a direction from a center to left and right edges of the display region, wherein the compression ratio of each spacer is a height reduction of the spacer by compression divided by an original height of the spacer;
forming a fence on the first substrate, such that the fence surrounds the display region to form a space defined by the first substrate and the fence;
dropping liquid crystal in the space to fill the space; and
assembling the first and second substrates with each other.
2. The method of claim 1 , wherein the spacers are patterned by a photolithography process.
3. The method of claim 2 , wherein the photolithography process is executed, such that an amount of light decreases in said direction.
4. The method of claim 1 , wherein the substrate comprises a plurality of pixel electrodes, the spacers being formed such that the spacers deviate from the pixel electrodes.
5. The method of claim 1 , wherein the substrate comprises a black matrix and a common electrode, the spacers being formed such that the spacers are disposed over the black matrix.
6. The method of claim 1 , wherein the spacers are tapered, a side face of the spacer and the transparent substrate forming a tapered angle, the tapered angle of the spacers gradually increasing in said direction, a product of an upper diameter and a lower diameter of the spacers decreasing in said direction.
7. The method of claim 6 , wherein a difference of the tapered angle of the spacer disposed at the edge and the tapered angle of the spacer disposed at the center is no more than about 40°.
8. The method of claim 1 , wherein the spacers are tapered, such that a tapered angle is constant, a side face of the spacer and the transparent substrate forming the tapered angle, a diameter of the spacers decreasing in said direction.
9. The method of claim 1 , wherein a polymer linking density of the spacers decreases in said direction.
10. The method of claim 1 , wherein Young's modulus of the spacers decreases in said direction.
11. The method of claim 1 , wherein an amount of compression of the spacer disposed at the center is smaller than the amount of compression of the spacer disposed at the edge by about 0.1 μm.
12. The method of claim 1 , wherein the spacers are formed, such that a condition 1<A center /A edge <1+0.1A center is satisfied, where A center denotes a cross-sectional area of the spacer disposed at the center and A edge denotes a cross-sectional area of the spacer disposed at the edge.
13. The method of claim 1 , wherein the spacer disposed at the center has a column shape, the spacers being tapered in said direction.
14. The method of claim 13 , wherein the column has a cylindrical shape, a rectangular prism shape or a hexagonal prism shape.
15. The method of claim 14 , wherein the column is tapered to form a truncated cone shape, a frustum of rectangular pyramid shape or a frustum of hexagonal pyramid shape.