Display Device Load Matching and ESD Protection
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Solution Overview
Problem
Existing organic light emitting display devices face challenges in maintaining uniform luminance across different pixel regions and are susceptible to electrostatic discharge, which affects the efficiency and reliability of image display.
Innovation Solution
The display device incorporates a load matching unit and protection unit, including poly-silicon protection lines and electrostatic discharge protection circuits, to equalize load values across scan lines and protect pixels from static electricity, ensuring uniform luminance and efficient use of dead spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple pixel regions with different widths are used to improve display area utilization, then dead spaces are efficiently used, but luminance uniformity deteriorates due to different load values on scan lines
Solution Approach 1:
The patent applies local quality by providing different load matching configurations to different pixel regions. Specifically, the first pixel region receives compensation through first load matching units, while the second pixel region receives compensation through second load matching units with different capacitance values, allowing each region to be optimized for its specific load characteristics and achieving uniform luminance across the entire display area.
Solution Approach 2:
The patent changes the electrical parameters (capacitance values) of the load matching units to compensate for the different load values on scan lines serving different pixel regions. By adjusting these capacitance parameters, the patent equalizes the overall load values, thereby resolving the luminance uniformity issue while maintaining efficient use of dead spaces.
2Reliability
If protection circuits are added to protect pixels from electrostatic discharge, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the protection function with the existing load matching units and scan line structure. The protection units are integrated into the peripheral regions and work in conjunction with the load matching units, rather than being completely separate components. This integration approach provides electrostatic discharge protection while minimizing the increase in device complexity.
Solution Approach 2:
The protection units act as intermediary elements between the scan lines and the pixels, providing electrostatic discharge protection without directly interfering with the normal operation of the display circuit. These protection units are positioned in the peripheral regions and selectively connect to scan lines, offering protection while maintaining circuit simplicity.
Data Source
AI summary
A display device includes: first pixels in a first pixel region and connected to first scan lines; second pixels in a second pixel region that is located at a side of the first pixel region and has a width smaller than a width of the first pixel region, and connected to second scan lines; third pixels in a third pixel region that is spaced apart from the second pixel region and has a width smaller than the width of the first pixel region, and connected to third scan lines; a load matching unit in a peripheral region at an outside of the second pixel region and the third pixel region, and configured to match loads of the second scan lines and the third scan lines to that of the first scan lines; and a protection unit connected between the second and third pixels and the load matching unit.