Display Panel Pixel Circuit Layout for Black-State Coupling Control
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Solution Overview
Problem
Improper wiring in the pixel drive circuit of display panels leads to non-black display in black-state conditions when operating in low-frequency mode, deteriorating display quality.
Innovation Solution
The display panel design includes a pixel drive circuit with a specific layout where the light-emitting control scanning signal line is positioned relative to the transmission and drive transistors to prevent coupling impacts on node potentials, using adjustment control signal lines and optimized transistor connections to maintain black-state display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light-emitting control scanning signal line is positioned overlapping with the transmission transistor channel, then the wiring is simplified, but voltage coupling occurs affecting black-state display quality
Solution Approach 1:
The patent introduces a vertical dimension (first direction) for signal line routing that intersects with the horizontal channel direction (second direction). The light-emitting control scanning signal line extends in the first direction and is positioned to overlap the transmission transistor channel in projection, but the intersection of directions minimizes parasitic capacitance coupling, resolving the contradiction between wiring simplicity and display quality.
2Use of energy by moving object
If the pixel drive circuit operates in low-frequency mode for black-state display, then power consumption is reduced, but improper wiring causes voltage coupling that prevents proper black-state display
Solution Approach 1:
The patent converts the potentially harmful voltage coupling effect into a beneficial configuration by strategically positioning the light-emitting control scanning signal line to overlap the transmission transistor channel in projection while extending in an intersecting direction. This configuration minimizes parasitic capacitance during low-frequency operation, allowing black-state display to be achieved with reduced power consumption without compromising reliability.
3Length of moving object
If the light-emitting control scanning signal line is routed through the center of the pixel sub-region, then connection length is minimized, but coupling with transistor channels increases
Solution Approach 1:
The patent applies local quality by differentiating the routing strategy for different signal lines within the pixel sub-region. The light-emitting control scanning signal line is specifically positioned to overlap the transmission transistor channel projection while extending in the first direction, creating a localized configuration that minimizes coupling at critical points while maintaining overall connection efficiency.
Data Source
AI summary
A display panel includes pixel sub-regions. Drive transistor of pixel drive circuit includes first electrode electrically connected to first electrode of transmission transistor and second electrode electrically connected to first electrode of light-emitting control transistor. A second electrode of light-emitting control transistor is electrically connected to first electrode of light-emitting element. An adjustment control signal line extends in a first direction and is connected to gate of the transmission transistor. A light-emitting control scanning signal line extends in the first direction and is connected to gate of the light-emitting control transistor. In a same pixel sub-region, in a second direction intersecting the first direction, orthographic projection of the light-emitting control scanning signal line on the substrate is located at a side of orthographic projection of a channel of the transmission transistor on the substrate away from orthographic projection of a channel of the drive transistor on the substrate.