Pixel Driving Circuit Time Control Sub-Circuit Motion Blur Reduction
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Solution Overview
Problem
In display technologies, particularly for OLEDs, the continuous operation of light-emitting devices during image frame switching leads to motion blur and reduced display quality due to prolonged working times, which affects the refresh rate and overall picture quality.
Innovation Solution
A pixel driving circuit with a time control sub-circuit that stops the light-emitting device from working after a preset time, using a control signal to turn off the driving sub-circuit, allowing for a black image presentation before switching to the next frame, thereby shortening the light-emitting device's working time and reducing motion blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light-emitting device operates continuously during image frame switching, then the display maintains continuous illumination, but motion blur increases and display quality deteriorates
Solution Approach 1:
The patent implements periodic operation of the light-emitting device by controlling it to emit light during the display period and remain off during the black image period. This periodic on-off operation, synchronized with the frame switching cycle, eliminates motion blur while maintaining necessary illumination during active display periods.
Solution Approach 2:
The patent applies preliminary anti-action by introducing a black image period before frame switching occurs. During this period, the light-emitting device is turned off in advance to prevent the overlap of residual light from the previous frame with the new frame, thereby counteracting the motion blur effect before it can manifest.
2Productivity
If the light-emitting device works for the entire frame period, then the display refresh rate is maintained, but the motion picture response time is prolonged
Solution Approach 1:
The patent segments the frame period into two distinct periods: a display period during which the light-emitting device operates normally, and a black image period during which it remains off. This segmentation reduces the total working time of the light-emitting device within each frame cycle while preserving the overall refresh rate structure.
Solution Approach 2:
The patent applies partial action by having the light-emitting device operate only during the necessary display period rather than throughout the entire frame period. This partial operation is sufficient to maintain image quality and refresh rate while reducing unnecessary working time and associated motion blur.
3Object-affected harmful factors
If a time control sub-circuit is added to stop the light-emitting device after preset time, then motion blur is reduced, but device complexity increases
Solution Approach 1:
The patent merges the time control function with the existing driving circuit by integrating the time control sub-circuit into the pixel driving circuit structure. The time control sub-circuit shares control signals and timing mechanisms with other circuit components, thereby reducing the overall complexity increase that would result from a completely separate time control system.
Data Source
AI summary
A pixel driving circuit includes: a data writing sub-circuit configured to write a data signal received at a data signal terminal into a first node under control of a first scanning signal received at a first scanning signal terminal; a driving sub-circuit configured to drive a light-emitting device coupled to a second node to work under control of a voltage of the first node and a first power supply voltage signal received at a first power supply voltage signal terminal; and a time control sub-circuit configured to transmit a control signal received at a control signal terminal to the first node under control of a second scanning signal received at a second scanning signal terminal after the light-emitting to device works for a preset time, so that the driving sub-circuit is turned off to control the light-emitting device to stop working.