Shift Register Circuit for GOA Display Panels
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Solution Overview
Problem
Existing display technologies face challenges in integrating gate drivers on array (GOA) substrates, leading to increased costs and complexity, particularly in eliminating wiring spaces and improving productivity and yield while maintaining symmetry and narrow bezels in display panels.
Innovation Solution
A shift register comprising an input circuit, first and second control circuits, and an output circuit, along with optional capacitive coupling, is designed to provide stable signal shift output, which can be used for light emitting control or gate scanning, thereby simplifying the integration process and reducing material and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gate driver circuits are integrated on array substrates using GOA technology, then wiring space in bonding area and fan-out area can be eliminated and manufacturing costs reduced, but device complexity and integration difficulty increase
Solution Approach 1:
The shift register circuit is divided into multiple functional modules including input circuit, first control circuit, second control circuit, and output circuit. Each module performs a specific function in the signal shifting process, making the overall complex circuit easier to design, analyze, and manufacture by breaking it down into manageable segments.
Solution Approach 2:
The patent implements cascaded connection of multiple shift register units where the output of one stage feeds into the input of the next stage. This nested structure allows compact integration of multiple functional blocks within the array substrate, eliminating the need for separate bonding area wiring while maintaining organized signal flow.
2Reliability
If multiple control circuits and capacitive coupling are added to ensure stable signal output, then signal stability improves, but device complexity increases
Solution Approach 1:
The first and second control circuits perform preliminary signal preparation and conditioning before the signal reaches the output circuit. By pre-controlling the signal levels and timing in advance, the output signal stability is ensured without requiring complex feedback or correction circuits, thus maintaining reasonable circuit complexity.
Solution Approach 2:
Capacitive coupling structures are introduced as intermediary elements between different circuit stages. These capacitors act as signal mediators that block DC components while allowing AC signal transmission, providing stable signal coupling between stages without requiring direct electrical connections, thus simplifying the overall circuit design while maintaining reliability.
3Productivity
If bonding process is eliminated in gate scanning line direction, then productivity and yield improve, but signal transmission reliability may be affected
Solution Approach 1:
The shift register circuit is designed to generate and transmit its own scanning signals internally through the cascaded structure. Each stage automatically drives the next stage without requiring external bonding connections, making the circuit self-sufficient. This eliminates bonding processes in the gate scanning line direction while maintaining signal transmission reliability through the inherent design of the coupled circuit stages.
Data Source
AI summary
The present disclosure discloses a shift register, a driving method thereof, a driving circuit, and a display device. The shift register includes an input circuit, a first control circuit, a second control circuit, and an output circuit. Signal shift output can be implemented through mutual cooperation between respective circuits. An output signal can be used as a light emitting control signal of a light emitting control transistor, or can be used as a gate scanning signal of a scanning control transistor.