OLED Panel Gate Signal Routing for Brightness Uniformity
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Solution Overview
Problem
Irregularly shaped organic light emitting display panels with varying pixel densities in different areas lead to uneven driving signal loads, resulting in non-uniform display brightness, especially when traditional rectangular structures evolve into high screen-to-body ratio designs with R-angles or notches.
Innovation Solution
The implementation of gate signal lines extending into a bezel area, where some lines are wired in a first metal layer and others in a second metal layer, with compensation capacitors formed between overlapping lines to balance loads and optimize bezel area usage, ensuring uniform brightness across different display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If compensation capacitors are connected to gate signal lines to balance driving loads, then display brightness uniformity is improved, but bezel area is widened
Solution Approach 1:
The patent embeds compensation capacitors within the pixel circuit structure itself, nesting the compensation function inside the existing pixel architecture rather than adding separate external compensation components in the bezel area. This allows load balancing while maintaining compact bezel dimensions.
Solution Approach 2:
The patent makes the pixel circuit serve multiple functions by integrating compensation capacitor functionality into the pixel circuit structure. The same circuit elements that drive the organic light emitting elements also provide compensation for driving load differences, eliminating the need for dedicated compensation components in the bezel area.
2Area of moving object
If irregularly shaped display panels are designed to increase screen-to-body ratio, then display area is increased, but driving signal line load balance deteriorates
Solution Approach 1:
The patent applies different wiring layer configurations to different local regions of the display panel. In regions where pixel rows have different numbers of pixels, the gate signal lines are routed through different metal layers to balance the driving loads, allowing irregular shapes while maintaining reliability.
Solution Approach 2:
The patent uses multiple metal layers (adding a vertical dimension to the wiring structure) to route gate signal lines. By distributing signal lines across different layers, the patent balances driving loads in irregularly shaped displays without compromising display area or screen-to-body ratio.
Data Source
AI summary
An organic light emitting display panel and an organic light emitting display apparatus are provided. The display panel includes an array substrate and a plurality of organic light emitting elements disposed on the array substrate, where the array substrate includes a substrate, and a first metal layer and a second metal layer sequentially disposed toward the plurality of organic light emitting elements; a first display area, a second display area, and a first bezel area, where, in a first direction, a number of organic light emitting elements in a row of organic light emitting elements in the first display area is smaller than a number of organic light emitting elements in a row of organic light emitting elements in the second display area, and the first bezel area is disposed adjacent to the first display area in the first direction; and a plurality of gate signal lines.