Display Controller Overdriving for Color Subpixel Response Uniformity
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Solution Overview
Problem
Display devices with color-specific pigment layers of varying thicknesses exhibit different response times, leading to image quality issues due to color blurring, particularly during video playback.
Innovation Solution
A controller and data driver circuit that differentiate overdriving voltages based on the thickness of color-specific pigment layers, converting image data into overdriven data to equalize response times across subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If color-specific pigment layers are designed with different thicknesses to improve color filtering performance, then color filtering performance is improved, but response times of color-specific subpixels become different, leading to image quality degradation
Solution Approach 1:
The patent applies local quality by providing different overdriving voltages to different color subpixels based on their specific pigment layer thickness characteristics. The controller identifies subpixels with thinner pigment layers and applies higher overdriving voltages specifically to those subpixels, while maintaining standard voltages for subpixels with appropriate thickness. This localized adjustment compensates for the inherent differences caused by varying pigment thicknesses, equalizing response times across all color subpixels without requiring uniform pigment layer thickness throughout the display panel.
2Loss of time
If overdriving is applied to all subpixels uniformly, then response times are improved, but energy consumption increases and image quality may deteriorate due to overdriving artifacts
Solution Approach 1:
The patent implements partial overdriving by selectively applying overdriving voltages only to specific subpixels that require compensation due to thinner pigment layers, rather than applying overdriving uniformly to all subpixels. The controller determines which subpixels need overdriving based on their color and pigment layer characteristics, and applies elevated voltages only to those specific subpixels during transition periods. This partial application of overdriving reduces overall energy consumption compared to universal overdriving while still achieving the goal of equalizing response times across different color subpixels.
Data Source
AI summary
A controller, a data driver circuit, a display device, and a method of driving the same are provided. Color-specific data driving is performed through adaptive overdriving in consideration of differences in response times of color-specific subpixels. Differences in response times of color-specific subpixels due to different thicknesses of color-specific pigment layers are reduced.