Pixel Driving Circuit Layout for Display Hysteresis Reset
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Solution Overview
Problem
Hysteresis in driver transistors causes residual images in display panels.
Innovation Solution
The display panel design includes a pixel driving circuit with specific transistor configurations and layer arrangements to mitigate hysteresis, utilizing transistors like the eighth transistor to reset the gate of the driver transistor and reduce leakage current, and incorporating a shielding layer to minimize light effects on driving characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel driving circuit is used, then the circuit structure is simple, but hysteresis in driver transistors causes residual images
Solution Approach 1:
The pixel driving circuit is segmented into multiple functional blocks: a driver transistor for driving the light-emitting element, a reset transistor (eighth transistor) for resetting the driver transistor gate, and compensation transistors (first, second, and ninth transistors) for compensating threshold voltage variations. This segmentation allows each component to perform its specific function independently, reducing hysteresis effects and residual images while maintaining manageable circuit complexity
Solution Approach 2:
The reset transistor is configured to reset the gate of the driver transistor before the driving operation, and compensation transistors are used to pre-compensate for threshold voltage variations. This preliminary action prevents hysteresis from accumulating and causing residual images, improving display quality by addressing the problem before it manifests
2Reliability
If the driver transistor gate is not reset, then the circuit operation is continuous, but hysteresis accumulates causing residual images
Solution Approach 1:
The reset function is extracted as a separate transistor (eighth transistor) that is specifically dedicated to resetting the driver transistor gate. This extracted reset mechanism independently addresses hysteresis accumulation without interfering with the continuous driving operation, allowing the circuit to maintain reliability while managing the complexity through functional separation
3Reliability
If shielding layer is added to minimize light effects, then display performance is enhanced, but manufacturing complexity increases
Solution Approach 1:
A shielding layer is introduced as an intermediary element between the pixel driving circuit and the light-emitting element. This shielding layer minimizes the effects of light on the driving characteristics by blocking or filtering stray light, thereby enhancing display performance. The shielding layer is integrated into the existing multi-layer structure, managing manufacturing complexity through systematic layer arrangement
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a pixel driving circuit on a side of a substrate. The pixel driving circuit includes a drivier transistor; a ninth transistor with a first electrode being connected to a third initial signal line, and a second electrode being connected to a first electrode of the driver transistor; an eighth transistor with a first electrode being connected to a gate of the driver transistor; a first transistor with a first electrode being connected to a first initial signal line, and a second electrode being connected to a second electrode of the eighth transistor; and a second transistor with a first electrode being connected to the second electrode of the eighth transistor, and a second electrode being connected to a second electrode of the driver transistor.