Shift Register Circuit for Narrow Bezel Displays
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Solution Overview
Problem
The existing gate driving circuits in display panels have a complex and large structure, which hinders the implementation of narrow bezels and high screen-to-body ratios due to their size, occupying a significant area in the non-display region.
Innovation Solution
A shift register circuit is designed with multiple cascaded shift register unit groups, where each group includes at least two shift register units, reducing the number of pull-down and pull-up control modules by sharing them across units, thereby simplifying the structure and reducing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gate driving circuit is provided in the non-display area, then the display panel can perform progressive scanning, but the circuit occupies a large area which is not beneficial for narrow bezel implementation
Solution Approach 1:
The gate driving circuit is divided into multiple shift register units (first shift register unit, second shift register unit, etc.) that are cascaded together. Each unit handles a portion of the scanning lines, allowing the overall circuit to be distributed across the non-display area rather than concentrated in one location, thereby reducing the peak area occupancy in any single region.
Solution Approach 2:
The shift register units are arranged in a cascaded configuration that utilizes both horizontal and vertical dimensions of the non-display area. The first shift register unit is arranged in a first direction while the second shift register unit is arranged in a second direction different from the first, creating a two-dimensional distribution pattern that optimizes space utilization and reduces the effective footprint.
2Ease of operation
If each shift register unit has independent pull-down and pull-up control modules, then each unit can operate independently, but the overall circuit complexity and size increase
Solution Approach 1:
Adjacent shift register units share common pull-down control modules and pull-up control modules. Specifically, the second pull-down control module of the first shift register unit serves as the first pull-down control module of the second shift register unit, and similarly for pull-up control modules. This sharing mechanism reduces the total number of control modules while maintaining independent operation capability through proper timing control.
Solution Approach 2:
The pull-down control modules and pull-up control modules are designed to serve multiple functions by being shared between adjacent shift register units. A single control module can control the pull-down or pull-up operations of multiple units at different time periods, making the control module universal and multi-functional rather than dedicated to a single unit.
Data Source
AI summary
Provided are a shift register circuit, a display panel and a display device. The shift register circuit includes a plurality of cascaded shift register unit groups; each shift register unit group includes at least two shift register units; in each shift register unit group, the signal output terminal of each shift register unit in the shift register unit group of a previous stage is electrically connected with the scan control terminal of each shift register unit in the shift register unit group of a next stage; in the same shift register unit group, the pull-down control module of one shift register unit also serves as the pull-down control module of each of other shift register units, and the signal output terminal of each shift register unit sequentially outputs an enable level of the scan signal.