Display Panel Driver Grayscale Adjustment for Luminance Uniformity
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Solution Overview
Problem
Display panels with varying transistor threshold voltages cause luminance differences among pixels, leading to image stains and unsatisfactory image quality, especially at low grayscales, where conventional stain compensation is inadequate.
Innovation Solution
A display panel driver with an adjustment value generating part that calculates an adjustment grayscale based on pixel luminance values, adjusting input grayscales to minimize luminance variations, storing this adjustment in a lookup table to ensure pixels have either a minimum or average luminance, and applying adjustments only when input grayscales exceed a reference value determined by maximum acceptable luminance variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional stain compensation is used, then luminance differences are partially compensated, but compensation is unsatisfactory at low grayscale levels
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the grayscale value based on the input grayscale level. When the input grayscale is below a reference threshold, the compensation mechanism applies a different adjustment strategy compared to higher grayscale levels. This allows the system to optimize luminance uniformity specifically for low grayscale conditions where conventional compensation fails, while maintaining effectiveness across the full grayscale range.
2Manufacturing precision
If grayscale adjustment is applied to all pixels, then luminance uniformity improves, but processing complexity increases
Solution Approach 1:
The patent implements local quality by applying differential processing based on the input grayscale value. Instead of uniformly adjusting all pixels regardless of their grayscale level, the system applies specific adjustment logic only when the input grayscale is below the reference threshold. This localized approach improves luminance uniformity where needed (low grayscale regions) while avoiding unnecessary processing complexity for pixels that don't require adjustment.
Solution Approach 2:
The patent applies partial action by selectively adjusting only those pixels with input grayscale values below the reference threshold, rather than processing all pixels uniformly. This partial processing approach achieves the necessary luminance uniformity improvement for problematic low grayscale pixels without incurring the full processing complexity of adjusting every pixel in the display.
3Manufacturing precision
If adjustment grayscale is calculated for each pixel, then luminance variation is minimized, but calculation overhead increases
Solution Approach 1:
The patent reduces calculation overhead by applying the adjustment grayscale calculation only to pixels with input grayscale values below the reference threshold. For pixels above the threshold, no calculation is performed. This localized calculation approach minimizes luminance variation in the critical low grayscale region while significantly reducing the overall computational burden compared to calculating adjustments for all pixels.
Solution Approach 2:
The system performs partial calculation by computing adjustment grayscale values only when necessary (for low grayscale pixels), rather than performing calculations for all pixels. This partial computation strategy achieves the required luminance uniformity improvement while minimizing the time loss associated with unnecessary calculations.
Data Source
AI summary
A display panel driver includes an adjustment value generation part configured to generate a first adjustment value and/or a second adjustment value based on pre-adjustment luminance values associated with pixels of a display panel, the pixels including a first pixel. The display panel driver further includes an adjustment part configured to receive image data associated with the first pixel for providing a first data signal. The adjustment part may generate the first data signal by adjusting the image data based on the first adjustment value if an input grayscale value associated with the first image data is greater than a reference value. The adjustment part may provide the image data as the first data signal or generate the first data signal by adjusting the image data based on the second adjustment value if the input grayscale value is equal to or less than the reference value.