OLED Panel High Voltage Line Color Shift
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Solution Overview
Problem
Organic light-emitting display panels experience a color shift phenomenon due to voltage drops in power supply lines, leading to different sub-pixel voltages and brightness outputs, resulting in reduced display quality, especially in larger panels where the effect is more pronounced between the proximal and distal IC ends.
Innovation Solution
The design includes a high voltage signal line configuration where sub-pixels of the same color are connected to the same high voltage signal line, increasing the load and equivalent resistance of the signal line, thereby equalizing current changes across sub-pixels, which alleviates the color shift issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If sub-pixels are connected to different high voltage signal lines, then the power supply can cover more sub-pixels, but the voltage drop increases causing color shift
Solution Approach 1:
The patent applies local quality by making the equivalent resistance of high voltage signal lines different for different sub-pixel colors. Specifically, sub-pixels of the same color are connected to the same high voltage signal line, creating localized groups with matched electrical characteristics. This ensures that sub-pixels experiencing similar voltage drops have identical color characteristics, compensating for the voltage drop effect locally rather than uniformly across all sub-pixels.
2Area of stationary object
If the display panel dimension is increased, then the display area is enlarged, but the color shift phenomenon becomes more serious
Solution Approach 1:
For large display panels, the patent divides the panel into multiple high voltage signal line groups, where each group serves a specific color channel. This segmentation allows the voltage drop characteristics to be managed locally for each color group rather than across the entire large panel, maintaining color uniformity even as the display area increases.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration ensures consistent current changes across sub-pixels, improving display quality by minimizing color shifts and enhancing user experience, especially in larger display panels.
Implementation Method 1
Each of the first to sixth sub-pixels includes a pixel driving circuit and an organic light-emitting diode
Data Source
AI summary
An organic light-emitting display panel includes: pixel rows arranged sequentially along a first direction and high voltage signal lines extending along the first direction. Each pixel row includes pixel sets arranged along a second direction which intersects the first direction. Each pixel set includes first and second pixels arranged along the second direction. The first pixel includes first to third sub-pixels emitting different colors. The second pixel includes fourth to sixth sub-pixels emitting different colors. Each sub-pixel includes a pixel driving circuit and an organic light-emitting diode. The high voltage signal lines are electrically connected to the sub-pixels, so as to provide voltage signals to anodes of the organic light-emitting diodes for driving the sub-pixels to emit light. For the same pixel set, the third and fourth sub-pixels have the same color, and are electrically connected to the same third high voltage signal line.