OLED Array Substrate Scan Signal Segmentation for Brightness Uniformity
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Solution Overview
Problem
In OLED display panels, the simultaneous activation of multiple pixel columns from the same row due to shared scan signal lines leads to uneven charging methods, resulting in uneven display brightness across columns, which affects display quality and increases the size of the display panel frame.
Innovation Solution
The array substrate design includes pairs of scan signal lines and driving reset control signal lines that alternate between columns, allowing each sub-pixel to receive distinct scan and reset signals, ensuring synchronized turn-on times and uniform charging across sub-pixels, while reducing the number of gate drivers and wirings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple pixel columns from the same row share a common scan signal line, then the number of scan signal lines is reduced, but uneven charging methods occur leading to uneven display brightness across columns
Solution Approach 1:
The scan signal lines are segmented into multiple independent lines (first scan signal line and second scan signal line) that extend in different directions. This segmentation allows different pixel columns to receive scan signals through different pathways, enabling independent control of charging timing for each column while maintaining overall system simplicity.
Solution Approach 2:
Different pixel columns are assigned different scan signal lines based on their spatial location. The first scan signal line serves pixel columns in a first direction, while the second scan signal line serves pixel columns in a second direction. This local differentiation ensures that each column receives optimized charging timing according to its position, achieving uniform display brightness across all columns.
2Manufacturing precision
If pairs of scan signal lines and driving reset control signal lines are used to provide distinct signals to each sub-pixel, then uniform charging and synchronized turn-on times are achieved, but the number of gate drivers and wirings increases
Solution Approach 1:
Multiple functional signal lines are merged into a unified grid structure where scan signal lines and driving reset control signal lines intersect to form pixel circuits. This merging allows comprehensive control of each sub-pixel through the combination of row-direction and column-direction signal lines, achieving uniform charging without requiring separate dedicated wiring for each control function.
Solution Approach 2:
The scan signal lines and driving reset control signal lines serve multiple functions simultaneously. The same signal lines provide both scanning functionality and reset control functionality to different pixel columns. This multi-functionality reduces the total number of required signal lines while maintaining comprehensive control over all sub-pixels for uniform display performance.
Data Source
AI summary
The present disclosure relates to an array substrate and a display panel and a display device thereof. The array substrate comprises: a substrate; a pixel array disposed on the substrate, comprising a plurality of sub-pixels arranged in a plurality of rows and a plurality of columns; a plurality of pairs of scan signal lines, extending in a row direction and being spaced apart from each other in a column direction; and a reset voltage source signal line and a data signal line, extending in the column direction.