Display Panel Power Routing for Uniform High-PPI Emission
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Solution Overview
Problem
Display panels experience poor display uniformity due to varying voltage drops across signal lines, which is exacerbated by increasing pixel density, affecting pixel per inch (PPI) and pitch requirements.
Innovation Solution
Implementing second power signal lines with the same line shapes as first power signal lines in a conductor layer, and using common power signal lines to reduce voltage drop differences, without adding additional wires, thus improving display uniformity and maintaining PPI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixel driving circuits are arranged in an array to increase pixel density, then pixels per inch (PPI) is improved, but voltage drop differences on signal lines increase causing poor display uniformity
Solution Approach 1:
The power supply network is segmented into multiple independent power signal lines (first power signal lines and second power signal lines) that are distributed across different conductor layers. This segmentation allows each power signal line to serve specific regions, reducing the distance and resistance for power delivery to pixel driving circuits at different locations, thereby minimizing voltage drop differences while maintaining high pixel density
Solution Approach 2:
The patent utilizes multiple conductor layers (first conductor layer and second conductor layer) to route power signal lines in different dimensional planes. By stacking power signal lines across multiple layers, the invention creates a three-dimensional power distribution network that reduces the effective resistance and voltage drop without increasing the two-dimensional pixel pitch, thus resolving the contradiction between high PPI and display uniformity
2Adaptability or versatility
If signal lines are made longer to reach pixel driving circuits at different locations, then all pixels can be connected, but voltage drop increases causing amplitude differences in electrical signals
Solution Approach 1:
The power delivery path is segmented into multiple shorter segments by introducing intermediate power signal lines and using multiple conductor layers. Instead of using a single long signal line that causes significant voltage drop, the power is delivered through multiple shorter segments, each with lower resistance, maintaining signal amplitude consistency across the display panel
Solution Approach 2:
The patent introduces second power signal lines as intermediary power delivery paths that work in conjunction with first power signal lines. These intermediary lines act as additional power supply routes, reducing the burden on individual long signal lines and ensuring that pixel driving circuits at different locations receive consistent power levels
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate plate; light-emitting elements and pixel driving circuits electrically connected to the light-emitting elements; first power signal lines electrically connected to the pixel driving circuits; and second power signal lines. The second power signal lines and the first power signal lines are located in a first conductor layer and have substantially same line shapes.