1. Field of the Invention
The present invention relates to a pixel structure, a multi-domain vertical alignment mode liquid crystal display (LCD) using the pixel structure, and also a method for forming the pixel structure.
2. Descriptions of the Related Art
Conventional LCDs (e.g., LCDs of the TN type) have different phase difference values and exhibit different luminances at different viewing angles. Furthermore, gray scale inversions may be found in such LCDs. These problems inevitably lead to a limited viewing angle range in conventional LCDs, especially in commonly used large size display panels.
As a result, many technologies have aimed to enlarge the viewing angle range, one of which is the multi-domain vertical alignment (MVA) technology. The main concept of MVA technology is to divide the LCD into a plurality of alignment areas so that the respective liquid crystal materials compensate for each other. The resulting LCD then exhibits the same phase difference value at different viewing angles to enlarge the viewing angle range and prevent gray scale inversions. For this reason, in common MVA technology, protrusions are arranged at appropriate locations (for example, on a color filter) in the LCD, to form a plurality of alignment areas. In short, such a technology relies on the protrusions to tilt the liquid crystal materials, so that when a voltage is applied, the liquid crystal materials in the different alignment areas will be driven to tilt in different directions, resulting in an improved viewing angle range. Although this may get rid of the narrow viewing angle range, light leakage due to the protrusions is often found in LCDs employing this method. As a result, the display effect will be adversely affected.
It can be seen from the above description that enlarging the viewing angle range by arranging protrusions in the LCD panel tends to cause light leakage. In view of this, it is important to design an LCD that will have a large viewing angle range without adding protrusions.