OLED Pixel Circuitry Threshold Voltage Compensation
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Solution Overview
Problem
Existing pixel circuitry in OLED displays experiences uneven picture display due to threshold voltage deviations and a hysteresis effect, leading to short-term afterimages, which cannot be effectively eliminated.
Innovation Solution
A pixel circuitry comprising a light-emitting element, driving circuit, compensation control circuit, initialization circuit, writing control circuit, and light-emitting control circuit, with a method that includes initialization, compensation, and display stages to manage threshold voltage compensation and ensure consistent initialization, thereby addressing the issue of uneven display and short-term afterimages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If threshold voltage compensation is performed in existing pixel circuitry, then display uniformity is improved, but short-term afterimage problems persist due to hysteresis effect
Solution Approach 1:
The patent applies preliminary action by initializing the driving transistor to an on-bias state before the threshold voltage compensation process. This preliminary initialization ensures that the transistor operates in a consistent state (with both source and drain connected) during compensation, preventing the hysteresis effect that causes afterimages while still achieving display uniformity through threshold voltage compensation.
2Ease of operation
If conventional initialization is performed, then transistor is simply turned on, but threshold voltage deviations cause uneven display
Solution Approach 1:
The patent enhances conventional initialization by adding a preliminary on-bias state initialization step before threshold voltage compensation. This preliminary action sets both source and drain connections for the driving transistor, ensuring consistent operating conditions that enable effective threshold voltage compensation and uniform display, while maintaining relative operational simplicity.
Data Source
AI summary
Disclosed are a pixel circuitry, a method for driving the same and a display device. The pixel circuitry includes a light-emitting element, a driving circuit, a compensation control circuit, an initialization circuit, an energy storage circuit, a writing control circuit and a light-emitting control circuit. The driving circuit is configured to drive the light-emitting element to emit light. The initialization circuit is configured to write an initialization voltage to a control end of the driving circuit to control the driving circuit to be turned on or off. The compensation control circuit is configured to turn on the driving circuit and perform threshold voltage compensation on the driving circuit. The writing control circuit is configured to write a data voltage inputted by a data line to a second end of the energy storage circuit and write a reference voltage to the second end of the energy storage circuit.