OLED Pixel Circuit Periodic Switching to Prevent Dynamic Smear
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Solution Overview
Problem
In OLED display apparatuses, dynamic images often result in dynamic smear due to the continuous emission of light by pixels, leading to poor display effects as human eyes perceive a holding mode of the display device.
Innovation Solution
A pixel circuit comprising a driving sub-circuit and a switch sub-circuit, where the switch sub-circuit controls the switch-on and switch-off of the signal path between the power signal terminal and the light emitting element under a switch signal, allowing the light emitting element to emit light only when necessary, thereby reducing the duration of emission and preventing dynamic smear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the light emitting element continuously emits light to maintain display continuity, then the display continuity is improved, but dynamic smear occurs leading to poor display effect
Solution Approach 1:
The patent applies periodic action by controlling the light emitting element to emit light in periodic pulses rather than continuously. The controlling transistor periodically switches the light emitting element between on and off states within each frame period, creating controlled light emission intervals that prevent dynamic smear while maintaining perceived display continuity through persistence of vision.
2Duration of action of stationary object
If the pixel circuit continuously supplies current to the light emitting element, then the light emission continuity is improved, but energy consumption increases
Solution Approach 1:
The controlling transistor implements periodic action by switching the current supply to the light emitting element in periodic pulses rather than continuous flow. Current is supplied only during the light emission phase and interrupted during the non-emission phase, significantly reducing energy consumption while maintaining the required light emission continuity for display purposes.
Solution Approach 2:
The pixel circuit uses the capacitor to store energy and maintain the gate voltage of the driving transistor during the non-emission phase. This self-service mechanism allows the circuit to maintain readiness for the next light emission cycle without continuous external power supply, reducing overall energy consumption while ensuring light emission continuity when needed.
3Duration of action of stationary object
If the pixel circuit maintains the driving transistor in switch-on state for the entire frame duration, then the light emission continuity is improved, but the ability to control dynamic image display is worsened
Solution Approach 1:
The controlling transistor implements periodic switching of the light emitting element within each frame period, enabling different light emission patterns for different display needs. This periodic control mechanism provides adaptability to display both static images (continuous emission) and dynamic images (intermittent emission), resolving the contradiction between emission continuity and dynamic control capability.
Solution Approach 2:
The patent introduces dynamic control capability by adding the controlling transistor that can adjust the light emission timing and duration based on display requirements. This dynamic element allows the pixel circuit to adapt between continuous emission mode for static images and intermittent emission mode for dynamic images, enhancing versatility while maintaining emission continuity when needed.
Data Source
AI summary
There are provided a pixel circuit and a method and apparatus for driving the same, an array substrate and a display apparatus. The pixel circuit includes: a driving sub-circuit and a switch sub-circuit coupled in series between a power signal terminal and a light emitting element, wherein the driving sub-circuit is configured to provide a driving signal to the light emitting element under control of a gate driving signal provided by a gate line, a data signal provided by a data line, and a power signal provided by a power signal terminal; and the switch sub-circuit is configured to control switch-on and switch-off of a signal path between the power signal terminal and the light emitting element under control of a switch signal provided by a switch signal terminal.