Display Panel Driving Method Mitigating Transistor Aging at Low Refresh Rates
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Solution Overview
Problem
Display panels face quality deterioration due to prolonged stress on transistors caused by constant gate voltages during low refresh rates, leading to aging effects.
Innovation Solution
A driving method for display panels that involves periodically applying pulse signals with specific voltage levels and intervals to switch devices during waiting periods to prevent prolonged bias levels, thereby mitigating stress and aging effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the refresh rate of the display panel is reduced to save power, then power consumption is reduced, but the transistors in the pixel circuits experience prolonged stress due to constant gate voltages, leading to aging effects and quality deterioration
Solution Approach 1:
The patent applies periodic action by introducing pulse signals that periodically adjust the gate voltages of transistors during the waiting period. Instead of maintaining constant gate voltages throughout the non-refresh period, the control terminal receives periodic pulse signals that temporarily modify the voltage levels, causing the transistors to periodically change their conduction states. This periodic voltage adjustment prevents prolonged stress accumulation while still allowing the display to operate at low refresh rates for power saving.
2Use of energy by moving object
If the gate voltages of transistors stay at the same level for a long time during low refresh rates, then power consumption is reduced, but the transistors encounter stress that deteriorates display quality
Solution Approach 1:
The patent introduces periodic pulse signals during the waiting period to temporarily adjust gate voltages, preventing transistors from remaining in the same conduction state for extended periods. This periodic voltage modulation reduces stress accumulation on transistor channels while maintaining overall low power consumption during non-refresh periods.
Solution Approach 2:
The patent changes the voltage parameter of gate signals by introducing pulse signals with different voltage levels (high-level voltage and low-level voltage) during the waiting period. This parameter change causes transistors to alternately switch between different conduction states, preventing prolonged stress at a single voltage level and thereby reducing aging effects.
Data Source
AI summary
A driving method for a display panel is provided. The display panel includes a plurality of pixel circuits arranged in an array. Each of the pixel circuits respectively includes a first switch and a second switch coupled in series. The driving method includes following steps. A first driving signal is received during an update period through a control terminal of the first switch of each of the pixel circuits, so that the first switch of each of the pixel circuits is continuously turned on during the update period. A second driving signal is sequentially received during the update period through a control terminal of the second switch of each of the pixel circuits.