Bendable Display Panel Transistor Width-Length Ratio
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Solution Overview
Problem
Foldable organic light emitting display panels experience display non-uniformity due to brightness differences caused by varying width-length ratios of driving transistors at bending and non-bending positions, leading to inconsistent display quality.
Innovation Solution
A display panel design with a first non-bendable and a second bendable display area, where the first driving transistor has a greater width-length ratio than the second, ensuring that the width-length ratio of the second driving transistor is adjusted to match the first after bending, thereby reducing the difference in driving currents and improving brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is made foldable with a bendable second display area, then the flexibility and portability are improved, but brightness non-uniformity occurs due to width-length ratio changes of driving transistors at bending positions
Solution Approach 1:
The patent applies different width-length ratios to driving transistors in different display areas. Specifically, driving transistors in the bendable second display area are designed with a first width-length ratio, while driving transistors in the non-bendable first display area use a second width-length ratio. This local differentiation compensates for the geometric distortion caused by bending, ensuring uniform brightness across the entire display when bent.
Solution Approach 2:
The patent changes the width-length ratio parameter of driving transistors based on their location in the display panel. By adjusting this geometric parameter locally in the bendable area versus the non-bendable area, the patent compensates for the physical deformation that occurs during bending, thereby maintaining consistent electrical characteristics and brightness uniformity across the display surface.
2Manufacturing precision
If driving transistors with different width-length ratios are used in bendable and non-bendable areas, then brightness uniformity is improved, but device complexity increases due to different transistor designs
Solution Approach 1:
The patent implements local quality by assigning different width-length ratios to driving transistors based on their specific location - bendable areas receive one ratio while non-bendable areas receive another. This targeted approach addresses the brightness uniformity issue only where needed (at bending positions) while maintaining standard designs in non-bendable regions, thereby minimizing overall device complexity.
Data Source
AI summary
Embodiments of the present disclosure provide a display panel and a display device to improve brightness difference between bending position and non-bending position of the display panel. The display panel includes an array substrate including a display area, the display area includes a non-bendable first display area in which a first driving transistor is arranged; a bendable second display area in which a second driving transistor is arranged, a width-length ratio of the first driving transistor being greater than that of the second driving transistor; a first organic light emitting diode arranged in the first display area and including an anode and a cathode, the anode being coupled to the first driving transistor; and a second organic light emitting diode arranged in the second display area and including an anode and a cathode, the anode of the second organic light emitting diode being coupled to the second driving transistor.