Display Device Power Supply Line Layout for Uniform Row Brightness
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Solution Overview
Problem
The uneven brightness across rows in display devices due to varying voltage and current distributions caused by resistance differences in power supply signal lines, leading to noticeable display quality issues.
Innovation Solution
Reversing the position of power supply input terminals for power supply signal lines and adjusting their widths and patterns to minimize voltage and current differences between adjacent rows, ensuring uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power supply signal lines with small cross-sectional areas are used, then device complexity is reduced, but resistance increases causing voltage drop and brightness unevenness
Solution Approach 1:
The patent applies local quality by making the power supply signal lines have different widths at different locations. Specifically, the first power supply signal line has a first width in a first region and a second width greater than the first width in a second region. This non-uniform width distribution compensates for voltage drops in different areas, ensuring uniform brightness across the display while maintaining overall structural simplicity.
2Manufacturing precision
If power supply signal lines with larger cross-sectional areas are used, then brightness uniformity is improved, but device complexity and area increase
Solution Approach 1:
Instead of uniformly increasing the width of power supply signal lines across the entire display, the patent selectively increases the width only in specific regions where voltage drops are more significant. The first power supply signal line has a greater second width in the second region compared to the first width in the first region, providing localized compensation for voltage drops without unnecessarily increasing overall device complexity and area.
3Manufacturing precision
If power supply signal lines with larger cross-sectional areas are used, then brightness uniformity is improved, but the area occupied by signal lines increases
Solution Approach 1:
The patent implements local quality by varying the width of power supply signal lines based on specific regional requirements. The first power supply signal line has a greater second width in the second region only where needed to compensate for voltage drops, rather than uniformly increasing the width across the entire display area. This approach minimizes the total area occupied by power supply signal lines while still achieving brightness uniformity.
Data Source
AI summary
A display device is disclosed. The display device allows a difference value between terminal voltages of light-emitting devices on two adjacent rows of a display substrate to be less than a target difference value by reversing a position of a power supply input terminal of one of power supply signal lines from a position adjacent to a printed circuit board to a position away from the printed circuit board, thereby correspondingly reducing a difference value between currents. Therefore, a brightness difference between the light-emitting devices of each row can be reduced to an extent that cannot be easily recognized by human eyes, thereby improving display quality of the display device.