AMOLED Transistor Shielding for Illumination Stability
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Solution Overview
Problem
AMOLED display panels suffer from display defects such as afterimages and smearing due to hysteresis in the data writing transistor and threshold compensation transistor sharing the same control line, leading to issues like screen turning red and flickering under strong illumination.
Innovation Solution
The display panel design includes separate control lines for the data writing and threshold compensation transistors, with the first electrode of the light-emitting element configured to shield the channels of the reset and threshold compensation transistors connected to the gate electrode of the driving transistor, thereby mitigating the effects of strong light on transistor characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the data writing transistor and threshold compensation transistor share the same control line, then the device complexity is reduced, but display defects such as afterimage and smearing occur due to hysteresis
Solution Approach 1:
The patent divides the control signal transmission by separating the control lines for the data writing transistor and threshold compensation transistor. This segmentation allows independent control of each transistor, eliminating the hysteresis effect that causes display defects while maintaining reasonable device complexity through systematic signal routing.
2Ease of manufacture
If transistors are controlled by shared lines, then the manufacturing process is simplified, but screen turning red and flickering occur under strong illumination
Solution Approach 1:
The patent introduces a shielding structure as an intermediary element between the transistors and strong illumination sources. This shielding structure blocks harmful light from reaching the transistor channels, preventing illumination-induced defects like screen turning red and flickering, while maintaining a manufacturable design through integration with existing pixel structure layers.
3Reliability
If the first electrode shields the transistor channels, then the stability under illumination is improved, but the device complexity increases
Solution Approach 1:
The patent designs the shielding structure to serve multiple functions: it shields transistor channels from illumination, maintains electrical isolation between components, and integrates with the existing pixel electrode structure. This multi-functionality reduces the need for additional separate shielding components, thereby limiting the increase in device complexity while achieving reliable illumination resistance.
Data Source
AI summary
A display panel and a display apparatus are provided. In the display panel, a first electrode of the threshold compensation transistor is connected to a first electrode of the driving transistor, a second electrode of the threshold compensation transistor is connected to a gate electrode of the driving transistor, and the data writing transistor is connected to a second electrode of the driving transistor, a material of an active layer of the threshold compensation transistor includes low-temperature poly-silicon, the gate line and the scan line are arranged along a second direction, the second direction intersects with the first direction, the gate line is different from the scan line, an active layer of the data writing transistor is located on a side of an active layer of the driving transistor away from the active layer of the threshold compensation transistor in the second direction.