Display Voltage Trace Layout for Uniform Sub-Pixel Brightness
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Solution Overview
Problem
In self-emissive display devices, the inconsistency in image brightness is caused by sub-pixels receiving different driving voltages due to varying equivalent resistances in voltage traces, leading to inconsistent brightness across the display.
Innovation Solution
The electronic device employs a voltage source module that provides different driving voltages to distinct voltage traces, ensuring each region electrode receives a consistent driving voltage regardless of its distance from the source, by using insulated and differently formed conductive layers for the voltage traces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same voltage source is used for all sub-pixels, then the device complexity is reduced, but the image brightness uniformity deteriorates due to different equivalent resistances of voltage traces
Solution Approach 1:
The voltage traces are segmented into multiple electrically insulated groups (first voltage traces and second voltage traces), with each group connected to different region electrodes. This segmentation allows independent voltage control for different display regions, compensating for resistance differences and achieving uniform brightness without requiring a separate voltage source for each sub-pixel.
Solution Approach 2:
Different driving voltages are applied to different region electrodes based on their specific requirements. The circuit module adjusts voltage parameters locally for different trace groups, providing tailored voltage compensation to each region to ensure uniform image brightness across the display.
2Manufacturing precision
If different driving voltages are provided to different voltage traces, then the image brightness uniformity is improved, but the device complexity increases due to multiple voltage configurations
Solution Approach 1:
Multiple voltage traces that require different driving voltages are merged into electrically insulated groups (first and second voltage traces), with each group connected to a corresponding region electrode. This merging reduces the number of independent voltage sources needed while maintaining the ability to provide different voltages to different regions.
Solution Approach 2:
The circuit module acts as an intermediary that generates multiple driving voltages from a single voltage source. It processes the voltage signals and distributes appropriate voltages to different voltage trace groups, simplifying the overall voltage source configuration while achieving the required voltage differentiation.
3Measurement precision
If voltage traces are electrically insulated from each other, then the voltage control precision is improved, but the manufacturing complexity increases
Solution Approach 1:
Electrically insulated voltage traces are arranged in different spatial layers or positions, allowing them to overlap in the top view while maintaining electrical insulation. This dimensional arrangement enables precise voltage control for different regions without requiring complex manufacturing processes for trace separation.
Data Source
AI summary
Disclosed is an electronic device having a display region and a peripheral region adjacent to the display region. The electronic device includes a first electrode disposed in the display region, a second electrode disposed in the display region, a circuit module disposed in the peripheral region, a first electrical trace, and a second electrical trace electrically insulated from the first electrical trace. The circuit module is electrically connected to the first electrode through the first electrical trace and provides a first driving voltage to the first electrical trace. The circuit module is electrically connected to the second electrode through the second electrical trace and provides a second driving voltage to the second electrical trace, and the first driving voltage is different from the second driving voltage. In a top view, the first electrical trace at least partially overlaps the second electrical trace.