Display Panel Gamma Compensation for UDC Boundary Brightness
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Solution Overview
Problem
Display panels with under-display camera (UDC) technology face challenges in driving pixels with different densities, leading to boundary effects due to varying pixel disposition densities, which increases memory requirements and affects image quality.
Innovation Solution
A device comprising a gamma correction circuit and a boundary compensation circuit to correct and compensate greyscale values in areas with different pixel densities, using digital gamma correction and lookup tables, and dividing the boundary area into sub-areas for precise compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixels are disposed in different densities in camera area and other areas according to UDC technology, then camera light transmission is improved, but boundary effects occur due to different pixel disposition densities
Solution Approach 1:
The patent applies local quality by using different pixel densities in different areas of the display panel. The camera area has lower pixel density to allow light transmission, while the non-camera area has higher pixel density for better display quality. This resolves the contradiction by making each area's pixel density match its specific functional requirements.
Solution Approach 2:
The patent changes the pixel density parameter spatially across the display panel. By adjusting the pixel disposition density from high in non-camera areas to low in camera areas, the patent optimizes both light transmission and display quality, preventing boundary effects through controlled parameter variation.
2Manufacturing precision
If different gamma curves are used for pixels in first area and second area, then image quality is improved, but boundary effects are generated due to different gamma curves
Solution Approach 1:
The patent applies local quality by using different gamma curves for different areas. The first area (camera area) uses a first gamma curve optimized for its characteristics, while the second area (non-camera area) uses a second gamma curve. This allows each area to have optimal image quality while the boundary compensation circuit mitigates the boundary effects.
Solution Approach 2:
The boundary compensation circuit acts as an intermediary to smooth the transition between areas using different gamma curves. It compensates for the boundary effects generated by the different gamma curves, allowing both areas to maintain their optimized gamma characteristics while preventing visible boundaries.
3Object-generated harmful factors
If boundary compensation is performed for all pixels, then boundary effects are reduced, but memory requirements excessively increase
Solution Approach 1:
The patent segments the display panel into three distinct regions: the first area (camera area), the second area (non-camera area), and the bounded part (boundary region). By applying boundary compensation only to the bounded part rather than all pixels, the patent reduces boundary effects while significantly reducing memory requirements compared to full-panel compensation.
Solution Approach 2:
The patent applies partial action by performing boundary compensation only where necessary - specifically in the bounded part between the first and second areas. This selective approach provides sufficient boundary effect reduction without the excessive memory requirements that would result from compensating all pixels across the entire display panel.
Data Source
AI summary
In a case when a camera is disposed under a display panel, a bounded part between a camera area and a surrounding area may have a brightness difference due to a difference in pixel disposition density. The present disclosure allows minimizing such a boundary effect by compensating for greyscale values of pixels in the bounded part.