UDC Display Panel Gamma Compensation for Boundary Brightness
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Solution Overview
Problem
Display panels with under-display cameras (UDC) face challenges in managing different pixel densities between camera and non-camera areas, leading to boundary effects and increased memory requirements due to varying gamma curves.
Innovation Solution
A display panel driving technology that includes a gamma correction circuit for different pixel areas and a boundary compensation circuit to adjust greyscale values, using transparent and opaque anodes for OLEDs, and digital gamma corrections with lookup tables to minimize boundary effects without excessive memory use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If different pixel densities are used in camera area and non-camera area, then camera performance is improved, but boundary effects occur between the two areas
Solution Approach 1:
The patent applies different pixel densities to different areas of the display panel - low density in the camera area (first area) and high density in the non-camera area (second area). This local differentiation optimizes camera performance while maintaining display quality in other regions, directly resolving the contradiction between camera performance and boundary effects.
Solution Approach 2:
The patent changes the pixel density parameter spatially across the display panel, creating a gradient transition zone between low-density and high-density areas. This parameter variation allows the system to achieve both optimal camera performance and reduced boundary effects through controlled density transitions.
2Manufacturing precision
If different gamma curves are applied to different pixel areas, then display accuracy is improved, but memory requirements increase
Solution Approach 1:
The patent segments the display panel into multiple areas (first area with camera and second area without camera), each applying different gamma curves. This segmentation allows precise display accuracy control for each region while managing memory requirements through targeted correction strategies.
Solution Approach 2:
The patent applies preliminary gamma correction to the image data before display, preparing the data with appropriate gamma characteristics for different areas. This preliminary action reduces the need for complex real-time processing and minimizes memory requirements for storing multiple gamma-corrected versions of the same image data.
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.