Pixel Circuit Dual Reset Units for OLED Image Sticking
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Solution Overview
Problem
Image sticking in OLED display devices is caused by the hysteresis effect of driving transistors, leading to inconsistent display brightness when switching between images, due to the incomplete reset of transistor potentials.
Innovation Solution
A pixel circuit design that includes a first reset unit to reset the potential of the driving unit's terminal and a second reset unit to reset the control terminal, ensuring a stable initial state before data voltage writing, thereby reducing the hysteresis effect and eliminating image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel circuit with single reset unit is used, then the device complexity is low, but image sticking occurs due to incomplete reset of transistor potentials
Solution Approach 1:
The reset function is segmented into two independent reset units: a first reset unit that resets the source electrode potential of the driving transistor, and a second reset unit that resets the gate electrode potential. This segmentation allows each reset unit to independently address specific potential残留 issues, eliminating image sticking without requiring complete redesign of the pixel circuit
Solution Approach 2:
The reset units perform preliminary action by resetting the transistor potentials to predetermined initial values before the data writing phase begins. This preliminary reset ensures that the driving transistor starts from a known initial state, preventing hysteresis effects and image sticking that would otherwise occur during subsequent operation
Data Source
AI summary
A pixel circuit, a pixel driving method and a display device are provided. The pixel circuit includes a light-emitting element, a driving unit, a light-emitting control unit, a driving control unit, an energy storage unit, a first reset unit and a second reset unit, the first reset unit is configured to write a first voltage output by a first voltage line into a first terminal of the driving unit under control of the reset control line; the second reset unit is configured to write an initial voltage output by an initial voltage line into a control terminal of the driving unit under control of the reset control line; the driving unit is configured to drive the light-emitting element to emit light under control of the control terminal of the driving unit.