Liquid Crystal Display Pixel Data Compensation Using Virtual Screen
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Solution Overview
Problem
Existing methods for calculating light profiles in local dimming of liquid crystal displays result in significant errors in pixel light amount calculations for side and corner portions, affecting pixel data compensation.
Innovation Solution
Extending the side and corner portions of the real screen to create a virtual screen with mirror-symmetrical dimming values, calculating light amounts using a virtual screen analysis area, and applying specific gain values to pixels in these areas to minimize errors in light amount calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming is applied to improve contrast characteristics, then image contrast is improved, but error in light amount calculation increases for side and corner portions
Solution Approach 1:
The patent extends the analysis area for calculating light amounts from a 2D grid to include virtual pixels beyond the physical panel boundaries. By adding a third dimension of virtual space surrounding the panel, the calculation incorporates light contributions from all directions, eliminating the directional bias that causes errors in side and corner portions.
Solution Approach 2:
The patent creates virtual pixels that copy the optical properties of real pixels but exist in extended spatial positions. These virtual pixels replicate the light emission characteristics of their corresponding real pixels, allowing the calculation to account for light that would naturally emanate from edge pixels in all directions, not just toward the panel center.
2Device complexity
If analysis area is limited to real screen boundaries, then calculation complexity is reduced, but light amount calculation accuracy deteriorates for edge pixels
Solution Approach 1:
The patent extends the analysis area from the 2D real screen boundaries into a 3D virtual space that surrounds the panel. This dimensional extension allows the calculation to include virtual pixels in all directions without significantly increasing computational complexity, as the virtual pixels follow the same calculation rules as real pixels.
Solution Approach 2:
The patent applies the same light amount calculation formula universally to both real pixels and virtual pixels. This universal approach simplifies the overall calculation process by using a single unified method rather than requiring different algorithms for edge versus center pixels, thereby maintaining low computational complexity while improving accuracy.
Data Source
AI summary
A method of compensating for pixel data includes extending a side portion and a corner portion of a real screen to set an virtual screen, setting dimming values of the virtual screen using dimming values of the real screen, calculating an amount of light of each of pixels on the real screen using the dimming values of the virtual screen mapped to a predetermined analysis area, and multiplying the amount of light of each pixel by a gain of each pixel to modulate pixel data.