Display Panel Via Layout for Uniform Light-Shielding Voltage
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Solution Overview
Problem
The threshold voltage drift of driving transistors in display panels causes uneven brightness, affecting display quality due to voltage drops and uneven voltage distribution on light-shielding conductive structures.
Innovation Solution
The display panel design includes a light-shielding conductive structure connected to power signal lines through via holes, with the distance between via holes being less than the length of the power signal lines, ensuring uniform voltage distribution and reducing threshold voltage differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light-shielding conductive structure is connected to power signal lines through via holes with large spacing, then the manufacturing complexity is reduced, but the voltage distribution uniformity deteriorates causing threshold voltage drift
Solution Approach 1:
The light-shielding conductive structure is divided into multiple segments along the first direction, with each segment connected to power signal lines through separately positioned via holes. This segmentation allows the structure to maintain electrical connection while reducing overall complexity
Solution Approach 2:
Different regions of the light-shielding conductive structure are connected to power signal lines at different positions. The via holes are strategically positioned at specific locations along the first direction to ensure uniform voltage distribution in different local regions, with the distance between via holes optimized to be less than the length of the power signal lines
2Ease of manufacture
If the distance between via holes is increased, then the manufacturing process is simplified, but the voltage drop increases causing brightness unevenness
Solution Approach 1:
The distance between via holes is optimized to be less than the length of the power signal lines, creating an optimal parameter range that balances manufacturing ease with electrical performance. This parameter optimization ensures uniform voltage distribution while maintaining manufacturability
3Adaptability or versatility
If via holes are positioned far from the power soldering pad, then the layout flexibility is improved, but the electrical connection reliability deteriorates due to voltage drops
Solution Approach 1:
The via holes are positioned to create equipotential regions along the light-shielding conductive structure, ensuring that voltage remains uniform across different locations. This equipotential design maintains electrical connection reliability while allowing layout flexibility
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 design improves the uniformity of display brightness by minimizing voltage drops and threshold voltage variations, enhancing display quality and allowing for higher pixel density.
Implementation Method 1
at least one of the first power signal line is electrically connected to the light-shielding conductive structure through at least one first via hole
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate; a pixel, a light-shielding conductive structure, and at least one first power signal line located on one side of the substrate. A first end of the first power signal line is electrically connected to a power soldering pad; the power soldering pad is located in the first non-display area; the pixel includes a pixel driving circuit including a driving transistor; the light-shielding conductive structure is located on a side of an active layer of the driving transistor adjacent to the substrate; at least one of the first power signal line is electrically connected to the light-shielding conductive structure through at least one first via hole; and in an extension direction of the first power signal line, a distance between any two first via holes is less than a length of the first power signal line.