Shift Register Circuit Reducing Transistor Count for Display Panels
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Solution Overview
Problem
Existing Gate Driver on Array (GOA) circuits have complex manufacturing processes and increased costs due to numerous switch transistors and complicated connecting structures, which can reduce the aperture opening ratio of display panels, degrading their competitiveness.
Innovation Solution
A shift register with a simplified structure comprising an input module, a node control module, a first output module, and a second output module, which reduces the number of signal lines required for scanning signal outputs, using switch transistors and a capacitor to maintain a stable voltage difference, thereby simplifying the manufacturing process and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a plurality of cascaded shift registers with multiple control signal lines are used to achieve scanning signal outputs, then the scanning function is achieved, but the number of switch transistors increases and the connecting structures become complicated
Solution Approach 1:
The patent combines multiple control signal functions into a single control signal line. Specifically, the control signal line is shared across multiple shift register stages, and through strategic timing and signal level control, a single line performs what traditionally required multiple separate control lines. This merging reduces the number of switch transistors and simplifies connecting structures while maintaining full scanning signal output capability.
Solution Approach 2:
The control signal line is designed to serve multiple functions simultaneously. By using different signal levels (high/low) and timing sequences on the same control line, it can control different shift register stages at different times, effectively making a single line perform the work of multiple dedicated control lines. This multi-functionality directly reduces device complexity while preserving scanning capabilities.
2Ease of operation
If multiple signal lines are used to provide control signals to various stages of shift registers, then the control function is achieved, but the aperture opening ratio of the display panel is reduced
Solution Approach 1:
The patent merges multiple control signal lines into a single shared control signal line that serves all shift register stages. This consolidation reduces the total number of signal lines required, thereby freeing up space on the display panel that can be converted to aperture area. The single control line achieves the same control functionality that previously required multiple lines, directly addressing the aperture ratio issue.
Solution Approach 2:
The patent introduces time as an additional dimension to resolve the spatial conflict. Instead of providing multiple control lines simultaneously in space, the system uses a single control line that provides control signals to different stages at different times (temporal multiplexing). This time-based approach eliminates the need for multiple spatial signal lines, thereby increasing aperture opening ratio while maintaining full control functionality.
3Ease of operation
If numerous switch transistors and complicated connecting structures are used in the GOA circuit, then the scanning signal output is achieved, but the manufacturing process becomes complex and production cost increases
Solution Approach 1:
The patent merges multiple control signal paths into a single shared control signal line, which directly reduces the number of switch transistors required. Fewer switch transistors mean simpler manufacturing processes, fewer interconnection steps, and lower production costs. The merging approach maintains scanning signal output capability while dramatically simplifying the manufacturing complexity associated with numerous discrete components and their connections.
Data Source
AI summary
According to the embodiments of the disclosure, a shift register and a method for driving the same, a gate driving circuit and a display apparatus may be provided. The shift register includes an input module, a node control module, a first output module and a second output module. The input module may control a potential at a first node via an input signal end and a first clock signal end, the node control module may configured to control the potential at a first node via a first control signal end and a DC signal end, the first output module may control the potential at a driving signal output end via a second control signal end and the DC signal end, and the second output module may maintain a voltage difference between the first node and the driving signal output end in a stable state when the first node is in a floating state and control the potential at the driving signal output end via the first node and the second clock signal end. By cooperating with each other, these four modules may achieve the outputs of scanning signals with a simpler structure and a fewer signal lines, so as to simplify the manufacturing process and reduce the production cost.