IR-drop compensation for display panels with mixed pixel layouts
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Solution Overview
Problem
Display panels with different pixel layouts, such as those used in under-display cameras, face issues with IR-drop compensation due to varying pixel densities, leading to display mura and artifacts at region boundaries.
Innovation Solution
A display driver with image processing circuitry and driver circuitry that performs IR-drop compensation based on luminances determined by the location of pixels within different regions, adjusting output voltage data to maintain consistent luminance across regions with varying pixel densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display panel includes regions with different pixel layouts (e.g., low PPI region for under-display camera), then the under-display camera can acquire images through the low PPI region, but IR-drop compensation becomes difficult and display mura and artifacts occur at region boundaries
Solution Approach 1:
The patent applies local quality by determining luminances separately for different regions (first region with first pixel layout and second region with second pixel layout) and performing IR-drop compensation specific to each region. The image processing circuitry identifies which region a pixel belongs to and applies region-specific compensation parameters, ensuring that each region's unique characteristics are addressed while maintaining overall display uniformity across region boundaries.
2Device complexity
If IR-drop compensation is performed without considering different pixel layouts, then processing is simpler, but display mura and artifacts occur at region boundaries
Solution Approach 1:
The patent segments the display panel into multiple regions with different pixel layouts (first region and second region). The image processing circuitry processes image data separately for each region by determining luminances based on the specific pixel layout of each region and applying region-specific IR-drop compensation. This segmentation approach maintains processing feasibility while achieving uniform display quality across regions with different characteristics.
3Adaptability or versatility
If pixel density is reduced in certain regions for under-display camera, then camera functionality is enabled, but current variations increase leading to IR-drop effects and display quality degradation
Solution Approach 1:
The patent changes the compensation parameters based on the pixel layout characteristics of each region. For regions with reduced pixel density (low PPI) used for under-display camera, the image processing circuitry determines luminances and applies IR-drop compensation parameters that account for the different current characteristics. This allows the system to maintain camera functionality while compensating for the increased IR-drop effects in low PPI regions through region-specific parameter adjustment.
Data Source
AI summary
A display driver includes image processing circuitry and driver circuitry. The image processing circuitry is configured to process first image data for pixels of a display panel comprising a first region and a second region to generate output voltage data. The first region and the second region have different pixel layouts. The driver circuitry is configured to update the pixels based on the output voltage data. Processing the first image data comprises IR-drop compensation based on first luminances of the pixels, each of the first luminances being determined based on the first image data and whether a corresponding pixel of the pixels is located in the first region.