Pixel Leakage and IR Drop Compensation Using 3D Lookup Tables
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Solution Overview
Problem
Electronic displays with higher resolutions and dynamic ranges are susceptible to image display artifacts due to current leakage between pixels and internal resistance (IR) drops, leading to issues like banding, color inaccuracies, and edge effects.
Innovation Solution
The use of 3D lookup tables (LUTs) and 2D LUTs to compensate for intra-pixel and inter-pixel current leakage and IR drops by adjusting luminance values of sub-pixels, with optional non-linear mapping at lower brightness to enhance interpolation fidelity and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If higher resolutions and dynamic ranges are implemented in electronic displays, then image quality is improved, but susceptibility to current leakage and IR drop artifacts increases
Solution Approach 1:
The patent applies preliminary anti-action by pre-calculating and storing compensation values in lookup tables that counteract the expected current leakage and IR drop effects. Before displaying an image, the system determines compensation values based on the desired luminance levels and stores them in LUTs, so that when the image is rendered, the pre-computed corrections automatically compensate for the harmful effects of current leakage and IR drop, preventing artifacts before they occur.
Solution Approach 2:
The patent employs parameter changes by adjusting the luminance values of sub-pixels based on their position and the luminance values of neighboring sub-pixels. The system modifies display parameters (luminance compensation values) dynamically according to the local image content and display conditions, using formulas that consider the luminance differences between adjacent sub-pixels to compensate for current leakage and IR drop effects.
2Manufacturing precision
If 3D LUTs are used to compensate for current leakage and IR drop, then artifact reduction is improved, but system resource consumption increases
Solution Approach 1:
The patent applies segmentation by dividing the compensation task into separate 2D lookup tables for different color channels (red, green, blue) and by spatial position. Instead of using a single large 3D LUT that would consume excessive resources, the system creates multiple smaller 2D LUTs, each handling a specific color channel and luminance range. This segmented approach reduces memory bandwidth and processing requirements while maintaining compensation effectiveness.
Solution Approach 2:
The patent implements partial action by applying compensation selectively based on luminance thresholds and local image characteristics. The system uses different compensation strategies for different luminance ranges (e.g., using 2D LUTs for lower luminance levels where current leakage is more pronounced) and adjusts the compensation intensity based on the luminance differences between adjacent sub-pixels. This partial application of compensation reduces computational overhead while maintaining artifact reduction effectiveness in the most critical regions.
Data Source
AI summary
An electronic device may include an electronic display having multiple pixels to display an image based on processed image data. Each of the pixels may include multiple sub-pixels. The electronic device may also include image processing circuitry to receive first image data for a sub-pixel of the and second image data for a group of sub-pixels surrounding the sub-pixel. The first image data may include a luminance value for the sub-pixel and the second image data may include luminance values for each sub-pixel of the group. The image processing circuitry may also determine a compensation value, to compensate the luminance value for lateral current leakage between the sub-pixel and the group of sub-pixels, based on the luminance value of the sub-pixel and the luminance values for each sub-pixel of the group of sub-pixels.