OLED Display Panel Dual Driving Circuit Luminance Uniformity
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Solution Overview
Problem
Existing OLED display panels face issues with non-uniform luminance due to voltage drops along operating voltage lines, causing pixel units closer to driving circuits to have higher luminance while those farther away have lower luminance, resulting in uneven display luminance.
Innovation Solution
The implementation of two sets of pixel driving circuits, where each set is connected to operating voltage lines at different points of the pixel array, ensuring that the sum of operating voltages for adjacent sub-pixel units of the same color remains constant, thereby maintaining uniform luminance across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single set of pixel driving circuits is used, then the device complexity is reduced, but the luminance uniformity deteriorates due to voltage drops along operating voltage lines
Solution Approach 1:
The pixel array is divided into multiple regions, each region being driven by a separate pixel driving circuit. This segmentation allows each circuit to serve a localized area, reducing the length of operating voltage lines and minimizing voltage drops within each region, thereby improving luminance uniformity across the entire display panel
Solution Approach 2:
Different regions of the pixel array are assigned to different pixel driving circuits based on their spatial locations. Each circuit is optimized to serve its specific region, creating local quality variations that compensate for the distance-related voltage drops and ensure uniform luminance characteristics across different areas of the display
2Illumination intensity
If multiple sets of pixel driving circuits are used, then the luminance uniformity is improved, but the device complexity increases
Solution Approach 1:
The pixel array is divided into multiple regions, each region being driven by a separate pixel driving circuit. This segmentation allows each circuit to serve a localized area, reducing the length of operating voltage lines and minimizing voltage drops within each region, thereby improving luminance uniformity across the entire display panel
Solution Approach 2:
Multiple pixel driving circuits are merged into a coordinated system where each circuit operates independently on its assigned region but collectively they drive the entire pixel array. This merging approach distributes the complexity across multiple simpler units rather than requiring one complex centralized driver
Data Source
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AI summary
A display panel and a driving method thereof and a display device are disclosed, and the display panel includes two sets of pixel driving circuits; and, for every two adjacent pixel columns for each primary color, an operating voltage line for one pixel column is connected to a first set of pixel driving circuits (110) via a connection point located at a side of a pixel array where the pixels in the first row of a pixel array (200) are located, and an operating voltage line for the other pixel column which is connected to the second set of pixel driving circuits (120) via a connection point located at a side of the pixel array (200) where the pixels in the last row of the pixel array are located. The display panel can ensure the uniformity of the display luminance of the whole display panel.