Liquid crystal display having wide viewing angle
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, comprising:
a first substrate;
a pixel electrode fanned on the first substrate;
a storage capacitor electrode formed on the first substrate;
a second substrate facing the first substrate; and
a common electrode formed on the second substrate, the common electrode having a depression pattern;
wherein the pixel electrode completely covers the storage capacitor electrode at a predetermined region.
2. The liquid crystal display of claim 1 , wherein the depression pattern overlaps the predetermined region at a side portion of the pixel electrode.
3. A liquid crystal display, comprising:
a first substrate:
a color filter formed on the first substrate and having a depressed portion, and
a common electrode formed on the color filter;
a second substrate facing the first substrate;
a storage capacitor electrode formed on the second substrate;
a pixel electrode formed on the second substrate and having an opening portion; and
a pixel region formed between the common electrode and the pixel electrode,
wherein the depressed portion is formed within the pixel region and the pixel electrode completely covers the storage capacitor electrode at a predetermined region.
4. The liquid crystal display of claim 3 , wherein the depressed portion has a depth smaller than the a thickness of the color filter.
5. The liquid crystal display of claim 4 , further comprising a black matrix formed on the first substrate.
6. The liquid crystal display of claim 5 , wherein the black matrix has a portion overlapped with the depressed portion.
7. The liquid crystal display of claim 6 , wherein the depressed portion and the opening portion form a closed area when viewed from the top side.
8. The liquid crystal display of claim 7 , wherein the depressed portion and the opening portion are arranged symmetrical to each other.
9. The liquid crystal display of claim 8 , further comprising:
a liquid crystal layer sandwiched between the first substrate and the second substrate, the liquid crystal layer having liquid crystal molecules with a negative dielectric anisotropy;
a first alignment layer and a second alignment layer formed on the common electrode and the pixel electrodes one by one, the first alignment layer and the second alignment layer aligning long axes of the liquid crystal molecules to be perpendicular to the substrates; and
a first polarizing plate and a second polarizing plate externally attached to the first substrate and the second substrate.
10. The liquid crystal display of claim 9 , wherein the first polarizing plate and the second polarizing plate have polarizing axes perpendicular to each other.
11. The liquid crystal display of claim 10 , wherein the liquid crystal molecules placed within the closed area defined by the depressed portion and the opening portion have four average long axial directions.
12. The liquid crystal display of claim 11 , wherein the average long axial directions make angles of 40-50° with respect to the polarizing axes of the first polarizing plate and the second polarizing plate.
13. The liquid crystal display of claim 3 , wherein the depressed portion and the opening portion form a closed area when viewed from the top side.