RGBW Display Panel Defective Pixel Compensation via Local Conversion Rate Control
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Solution Overview
Problem
RGBW-type organic EL display devices face issues with defective pixels causing conspicuous black spots when displaying white, leading to degraded display quality and increased defective panel incidence, as existing technologies cannot effectively manage the RGB-signals-to-W-signal conversion rate to conceal such defects.
Innovation Solution
A display device with an RGB-RGBX conversion circuit that converts RGB signals into RGBX signals, featuring a conversion rate controller to adjust the conversion rate based on the position of defective pixels, making the defective pixel less conspicuous by altering the conversion rate for adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the RGB-signals-to-W-signal conversion rate is set to 100% to maximize power consumption reduction, then power consumption is minimized, but defective W pixels appear as conspicuous black spots degrading display quality
Solution Approach 1:
The patent applies local quality by differentiating the conversion rate control based on pixel location. Pixels adjacent to defective W pixels are assigned a different (lower) conversion rate compared to normal pixels, allowing the system to maintain high overall conversion efficiency while locally compensating for defects to prevent conspicuous black spots.
Solution Approach 2:
The patent changes the conversion rate parameter dynamically based on the position of pixels relative to defective W pixels. By adjusting the RGB-signals-to-W-signal conversion rate from 100% for normal pixels to a lower value for adjacent pixels, the system resolves the contradiction between power efficiency and display quality.
2Device complexity
If a fixed conversion rate is applied across the entire display panel to simplify control, then device complexity is reduced, but defective pixels remain conspicuous and display quality deteriorates
Solution Approach 1:
The patent implements local quality by applying different conversion rates to different regions of the display panel. Specifically, pixels adjacent to defective W pixels receive a differentiated conversion rate control, while other pixels use the standard conversion rate, thereby improving display quality without requiring complete system redesign.
Solution Approach 2:
The patent applies preliminary action by pre-identifying the positions of defective W pixels and pre-calculating which pixels are adjacent to them. This allows the conversion rate control to be applied selectively and automatically during normal operation, maintaining simplicity while improving quality.
3Reliability
If the conversion rate for pixels adjacent to defective pixels is reduced to make defects less conspicuous, then display quality is improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by restricting the reduced conversion rate application only to pixels adjacent to defective W pixels, while maintaining the high 100% conversion rate for all other normal pixels. This localized approach minimizes the impact on overall power consumption while effectively concealing defective pixels.
Solution Approach 2:
The patent applies partial action by reducing the conversion rate only where necessary (for pixels adjacent to defective W pixels) rather than applying it globally. This partial application of the conversion rate reduction achieves the quality improvement goal with minimal sacrifice in power efficiency.
Data Source
AI summary
A display device has: an RGB-RGBW conversion circuit that converts RGB signals fed thereto into RGBW signals; a display panel that has a plurality of dots each composed of four, namely R, G, B, and W, unit pixels and that displays an image based on the RGBW signals; a defect position specifier that specifies, if a unit pixel is found defective, a position of the defective pixel on the display panel; and a conversion rate controller that controls the rate at which, when the RGB signals are converted into the RGBW signals, the RGB signals are converted into a W signal according to the position of the defective pixel. If the defective pixel is a W pixel, the conversion rate for pixels adjacent thereto is made lower than the standard conversion rate set for the entire display panel.