OLED Display Afterimage Compensation via Discharge Circuit
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Solution Overview
Problem
OLED display apparatuses face challenges in measuring cooling time necessary for afterimage compensation when power supply is interrupted, leading to potential screen burn-in and reduced accuracy in afterimage compensation, especially in scenarios where immediate use is required, such as store displays.
Innovation Solution
An OLED display apparatus utilizing a switch element and capacitor to measure cooling time even when power is interrupted, allowing for afterimage compensation without the need for expensive battery or RTC circuits, ensuring the cooling time is satisfied before compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If AC power is turned off, then the processor cannot measure the cooling time, but turning on the screen to use it immediately causes insufficient cooling time and reduces afterimage compensation accuracy
Solution Approach 1:
The discharge circuit performs preliminary action by measuring the cooling time during the power-off period before the processor needs to make compensation decisions. The capacitor stores this timing information, so when power is restored, the cooling time has already been measured and is ready for use in afterimage compensation calculations.
2Reliability
If battery and RTC circuit are used to measure cooling time, then cooling time can be measured even when power is interrupted, but the configuration becomes expensive
Solution Approach 1:
The patent replaces expensive, permanent components (battery and RTC circuit) with a simple, inexpensive capacitor-based discharge circuit. The capacitor serves as a temporary, disposable timing element that fulfills the measurement function without requiring costly permanent power and timing infrastructure.
Solution Approach 2:
The patent substitutes the electronic/mechanical system (battery and RTC circuit) with a simpler electrical discharge circuit using a capacitor. This replacement eliminates the need for permanent power sources and complex timing circuits while achieving the same cooling time measurement function.
3Measurement precision
If screen is turned off to secure cooling time, then afterimage compensation accuracy is maintained, but the user cannot use the display panel for a predetermined time
Solution Approach 1:
The cooling time measurement is performed in advance during the power-off period by the discharge circuit, so when power is restored and the screen is turned on, the measurement is already complete. This eliminates the need to wait or turn off the screen again, allowing immediate use while maintaining measurement accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous operation and quick afterimage compensation without turning off the screen, reducing costs by using an inexpensive discharge circuit to measure cooling time, thus preventing screen burn-in and maintaining accuracy.
Implementation Method 1
a discharge circuit configured to discharge a voltage if the display panel is driven for more than a predetermined time and the supply of power to the display panel is interrupted
Data Source
AI summary
An organic light emitting diode display apparatus includes a display panel, a discharge circuit configured to discharge a voltage if the display panel is driven for more than a predetermined time and the supply of power to the display panel is interrupted, and a processor configured to, if the power is supplied, determine whether a cooling time required for afterimage compensation of the display panel is satisfied, and if the cooling time is satisfied, perform the afterimage compensation of the display panel.