Display Device Segmented Power Supply for IR Drop Compensation
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Solution Overview
Problem
In display panels, as the current increases to achieve high luminance, IR drops lead to decreased luminance and potential color shifts due to uneven current distribution to light-emitting layers of different colors.
Innovation Solution
The display device incorporates a configuration with multiple subpixels of specific colors per pixel, utilizing separate power supplies for different subpixel groups and a signal processing circuit to manage current distribution based on input signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the current flowing through the display panel is increased to output high luminance, then the luminance is improved, but the IR drop increases causing a decrease in luminance and color shift
Solution Approach 1:
The display panel is divided into multiple independent power supply regions, with each region having its own power supply unit. This segmentation allows each region to independently compensate for voltage drops, preventing the cumulative IR drop effect that occurs in unified power supply systems when high current is applied for high luminance output.
Solution Approach 2:
Each power supply region is configured to independently adjust its output voltage based on local current consumption characteristics. This local quality approach enables precise compensation for IR drops in each specific region, maintaining consistent luminance and color accuracy across the entire display panel even at high brightness levels.
2Manufacturing precision
If the current supplied to light-emitting layers of different colors is made different to achieve color control, then color accuracy is improved, but color shift occurs due to IR drop
Solution Approach 1:
The display panel incorporates feedback mechanisms where each power supply region monitors its own current consumption and voltage levels, then automatically adjusts its output to compensate for IR drops. This feedback control ensures that the actual current reaching each light-emitting layer maintains the intended ratio for accurate color reproduction, preventing color shift even when different current levels are required for different colors.
Solution Approach 2:
The system dynamically changes the output voltage parameter of each power supply region based on real-time current consumption patterns. By adjusting voltage parameters locally in response to varying current demands of different colored light-emitting layers, the system maintains stable color characteristics despite the inherent IR drops that occur with different current levels.
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 effectively curbs the decrease in luminance and occurrence of color shifts caused by IR drops, ensuring stable and accurate color representation across the display panel.
Implementation Method 1
a first subpixel and a second subpixel each including a light-emitting layer emitting light of a first color, a third subpixel including a light-emitting layer emitting light of a second color, and a fourth subpixel including a light-emitting layer emitting light of a third color
Data Source
AI summary
A display device includes: a display panel including a plurality of pixels, the pixels including a first subpixel and a second subpixel each including a light-emitting layer emitting light of a first color, a third subpixel including a light-emitting layer emitting light of a second color, and a fourth subpixel including a light-emitting layer emitting light of a third color; a first power supply configured to supply a current to the first subpixel and the third subpixel; a second power supply configured to supply a current to the second subpixel and the fourth subpixel; and a signal processing circuit configured to receive an input signal for each pixel and generate a first signal corresponding to the first subpixel and a second signal corresponding to the second subpixel.