OLED Image Sticking Erasure via Power-Off Delay Discharge
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Solution Overview
Problem
Organic light emitting displays experience image sticking due to residual charges that cannot be discharged upon power-off, leading to persistent image retention even after power is turned back on.
Innovation Solution
An organic light emitting display system that includes a panel driving circuit and a power supply unit, which maintains a logic power supply voltage during a predetermined power-off delay time after power input signal decreases, allowing the circuit to supply black data or gate signals to discharge pixels and prevent image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If power is turned off immediately, then power consumption is reduced, but residual charges remain in pixels causing image sticking
Solution Approach 1:
The patent applies preliminary action by maintaining the logic power supply voltage for a predetermined period after the power input signal decreases. This allows the panel driving circuit to continue operating and discharge residual charges from pixels before complete power shutdown, preventing image sticking while minimizing extended power consumption
Solution Approach 2:
The patent applies preliminary anti-action by using the panel driving circuit to supply black data or gate signals to pixels during the delay period, actively discharging residual charges that would otherwise cause image sticking, thereby counteracting the harmful effect before complete power-off
2Reliability
If logic power supply voltage is maintained during power-off delay time, then pixels can be discharged to prevent image sticking, but power consumption increases
Solution Approach 1:
The logic power supply voltage is maintained only for the necessary predetermined period required to discharge pixel charges, after which it is dropped. This minimizes the duration of increased power consumption while ensuring complete charge discharge to prevent image sticking
Solution Approach 2:
The patent applies partial action by maintaining power supply only long enough to achieve the necessary charge discharge function, avoiding excessive power consumption while ensuring sufficient time for complete pixel discharge
Data Source
AI summary
An organic light emitting display and a method of erasing an image sticking thereof are provided. In the image sticking erasing method, a panel driving circuit is driven by a logic power voltage during a power-off delay time to discharge pixels.