Sub-pixel Compensation for S-PVA LCD Viewing Angle
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Solution Overview
Problem
Conventional S-PVA LCD devices do not apply the optimal compensated gray scale to each sub-pixel, leading to narrowed lateral viewing angles due to gamma curve distortion at intermediate gray scales.
Innovation Solution
A driving device that converts input image data into first and second sub-image data with different gray scales and compensates them individually using a converter, first and second compensators, and an output circuit, ensuring optimal compensated image data is provided to each sub-pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the S-PVA LCD device creates two sub-gray scales based on the compensated gray scale of the input gray scale, then the liquid crystal response speed is improved, but the optimal compensated gray scale is not applied to each sub-pixel
Solution Approach 1:
The patent divides the compensation process into two separate pathways: one for the first sub-pixel and another for the second sub-pixel. Each sub-pixel receives individually compensated gray scale values through separate compensation circuits, allowing optimal compensation for each sub-pixel while maintaining fast response speed. This segmentation resolves the contradiction by enabling both high-speed response and precise individual compensation.
Solution Approach 2:
The patent applies different compensation characteristics to different sub-pixels based on their specific requirements. Each sub-pixel has its own compensation circuit that can be independently adjusted to provide the optimal compensated gray scale for that particular sub-pixel, achieving local optimization rather than uniform compensation across all pixels.
2Adaptability or versatility
If the S-PVA LCD device uses patterned vertical alignment to widen viewing angle, then the lateral viewing angle is improved, but gamma curve distortion occurs at intermediate gray scale
Solution Approach 1:
The patent applies compensation before the display process to pre-correct the gray scale values that will be displayed. By calculating and applying compensation values in advance based on the relationship between input gray scale and displayed gray scale, the system prevents gamma curve distortion before it occurs, ensuring accurate intermediate gray scale display while maintaining the wide viewing angle characteristics of PVA technology.
Solution Approach 2:
The patent implements a feedback mechanism where the relationship between input gray scale and displayed gray scale is measured and used to generate compensation values. This closed-loop approach allows the system to automatically adjust compensation parameters to eliminate gamma curve distortion, maintaining both wide viewing angle and high gray scale accuracy.
Data Source
AI summary
In a driving device and a display apparatus having the driving device, a converter converts input image data and outputs first and second sub-image data which have different values. A first compensator compensates the first sub-image data and outputs a first compensated image data, and a second compensator compensates the second sub-image data and outputs a second compensated image data. An output circuit controls output time of the first and second compensated image data. Accordingly, sub-image data for each sub-pixel may be exactly compensated by employing compensators to individually compensate for the sub-image data of each sub-pixel.