Common electrode on substrate having non-depressed surface portion overlapping opening in pixel electrode on opposite substrate and depressed portion partially overlapping edge of the pixel electrode
View Patent ↗A liquid crystal display includes a first substrate with pixel electrodes, and a second substrate with a common electrode facing the first substrate. The common electrode has depression patterns corresponding to the pixel electrodes. The side wall of each depression pattern is at an angle of 30-120° with respect to the first substrate. The depression patterns of the common electrode are formed through making depression patterns at color filters. In this structure, the liquid crystal display bears wide viewing angle and good picture quality.
1. A liquid crystal display (LCD), comprising:
a first substrate;
a pixel electrode formed on the first substrate and having an opening pattern;
a storage electrode formed on the first substrate;
a second substrate facing the first substrate; and
a common electrode formed on the second substrate and having a non-flat continuous surface including a depressed portion and a non-depressed portion;
wherein a non-depressed portion of the common electrode completely overlaps an opening of the pixel electrode and the depressed portion adjacent to the non-depressed portion of the common electrode at least partially overlaps an edge of the pixel electrode; and
further wherein the pixel electrode covers a portion of the storage electrode in a width direction.
2. The LCD of claim 1 , further comprising a color filter formed on the second substrate and having a depressed portion.
3. The LCD of claim 2 , further comprising a black matrix formed on the second substrate.
4. The LCD of claim 3 , wherein the black matrix has a portion overlapped with the depressed portion.
5. The LCD of claim 2 , wherein the depressed portion and the opening pattern form a substantially closed area.
6. The LCD of claim 5 , further comprising:
a liquid crystal layer sandwiched between the first substrate and the second substrate, the liquid crystal layer having liquid crystal molecules with negative dielectric anisotropy;
a first alignment layer formed on the pixel electrode;
a second alignment layer formed on the common electrodes, wherein the first alignment layer and the second alignment layer align long axes of the liquid crystal molecules perpendicular to the substrates;
a first polarizing plate formed on an outer surface of the first substrate; and
a second polarizing plate formed on an outer surface of the second substrate.
7. The LCD of claim 6 , wherein the first polarizing plate and the second polarizing plate have polarizing axes perpendicular to each other.
8. The LCD of claim 7 , wherein the liquid crystal molecules placed within the closed area defined by the depressed portion and the opening pattern have four average long axial directions.
9. The LCD of claim 8 , wherein each of the average long axial directions is slanted at an angle between about 40° and about 50° with respect to the polarizing axes of the first polarizing plate and the second polarizing plate.
10. The LCD of claim 1 , wherein the non-depressed portion is formed between black matrixes formed on the second substrate.