Gate Electrode Driving Circuit for Pixel Threshold Recovery
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Solution Overview
Problem
The threshold drift of switching transistors in pixel driving circuits due to prolonged turned-on states affects the normal display performance in display panels.
Innovation Solution
A gate electrode driving circuit that provides pulse width modulation signals to pixel driving circuit subgroups in alternating frames, allowing for threshold recovery of switching units by alternating their on-states, and includes interconnected switching unit ends to reduce potential differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the switching transistor is kept in a turned-on state for a long time to maintain display brightness, then the display brightness is stable, but the threshold drift of the switching transistor becomes severe
Solution Approach 1:
The patent implements periodic action by alternating the turned-on state of switching transistors in different pixel driving circuit rows between adjacent frames. In the current frame, one subgroup of rows has its switching transistors turned on, while another subgroup is turned off. In the next frame, these states are reversed. This periodic switching allows transistors to alternate between conducting and recovering states, preventing continuous threshold drift while maintaining overall display brightness through temporal multiplexing.
2Duration of action of stationary object
If the switching transistor is turned on for the entire frame duration, then the display brightness is maintained, but the transistor does not have enough recovery time leading to severe threshold drift
Solution Approach 1:
The patent applies segmentation by dividing the pixel driving circuit rows into multiple subgroups based on their switching transistor states. Specifically, rows are segmented into those with turned-on switching transistors and those with turned-off switching transistors. This segmentation allows different regions of the display to be driven differently within the same frame, enabling some transistors to be in recovery state while others are in conduction state, thus reducing threshold drift without sacrificing overall display brightness.
3Speed
If all pixel driving circuit rows are driven simultaneously, then the display response is fast, but the switching transistors experience severe threshold drift due to prolonged operation
Solution Approach 1:
The patent uses periodic action to alternate the driving of different pixel driving circuit row subgroups between adjacent frames. In each frame, only a subset of rows is actively driven while others are in recovery state. This periodic switching maintains fast display response for the active rows while allowing other rows to recover, preventing cumulative threshold drift across all transistors over time.
Data Source
AI summary
A gate electrode driving circuit is provided and includes: a plurality of output terminals provided in correspondence with pixel driving circuit rows, and configured to provide a pulse width modulation signal to a control terminal of a first switching unit; the gate electrode driving circuit provides the pulse width modulation signal to a pixel driving circuit subgroup in a same pixel driving circuit group in a same frame, where each pixel driving circuit group includes a plurality of pixel driving circuit rows with each including a plurality of pixel driving circuits distributed along a first direction; a part of the pixel driving circuit rows in the pixel driving circuit group form the pixel driving circuit subgroup; the gate electrode driving circuit further provides the pulse width modulation signal to different pixel driving circuit subgroups of the same pixel driving circuit group in at least a part of different frames.