Dummy GOA Unit Control Signal for Display Panel Lifetime
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Solution Overview
Problem
Dummy GOA units in display panels have a shorter lifetime due to prolonged exposure to high potential, causing stress on connected TFTs and reducing their lifespan compared to active GOA units.
Innovation Solution
The introduction of a control signal with a first and second pulse, generated between the last clock pulse of the current frame and the frame start pulse of the next frame, allows the pull-down module of the dummy GOA unit to reduce its potential earlier, thereby shortening the time it remains at high potential and prolonging its lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the pull-down module of the dummy GOA unit uses the frame start signal of the next frame, then the circuit structure is simple, but the Q point remains at high potential for a long time causing TFT stress and shorter lifetime
Solution Approach 1:
The control signal is segmented into multiple pulses (first pulse, second pulse, third pulse) instead of using a single frame start signal. This segmentation allows the Q point to be pulled down at multiple stages during the frame period, reducing the duration of high potential exposure and thereby reducing TFT stress while maintaining circuit simplicity
Solution Approach 2:
The first pulse is generated before the frame start signal of the next frame arrives, preliminarily pulling down the Q point to a intermediate level. This preliminary action prevents the Q point from remaining at high potential throughout the entire frame duration, thereby reducing TFT stress before the actual frame start signal arrives
2Reliability
If the control signal pulls down the Q point completely before the next frame start signal, then TFT stress is reduced, but the pull-down timing becomes complex
Solution Approach 1:
The pull-down process is made dynamic through multi-stage pulsing rather than a static single-pulse approach. The first pulse provides preliminary pull-down, the second pulse provides complete pull-down synchronized with the frame start signal, and the third pulse provides post-correction. This dynamic multi-stage approach reduces TFT stress while keeping the timing control systematic and manageable
Solution Approach 2:
The control signal employs periodic pulsing within each frame period, with pulses occurring at specific intervals (first pulse before frame start, second pulse with frame start, third pulse after frame start). This periodic action pattern systematically manages the Q point voltage levels to reduce TFT stress while maintaining organized timing control
Data Source
AI summary
The present disclosure provides a display panel including a display GOA unit and a dummy GOA unit connected to the display GOA unit, a pull-down module of the display GOA unit receives a frame start signal and a pull-down module of the dummy GOA unit receives a control signal; within a frame duration, the frame start signal comprises one frame start pulse, and the control signal comprises a first pulse and a second pulse sequentially generated at intervals; a first pulse of a previous frame is generated between a last clock pulse of a previous frame and a frame start pulse of a next frame; a second pulse of the previous frame is generated between the last clock pulse of the previous frame and the frame start pulse of the next frame or in synchronization with the frame start pulse of the next frame.