Self-Resetting Dummy Stages in Gate Driver Circuits
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Solution Overview
Problem
The issue of multiple outputs in dummy stages of a gate driver circuit within a transparent display panel leads to excessive gate bias, causing deterioration and malfunction, particularly when the panel is cuttable.
Innovation Solution
A gate driver circuit design that includes dummy stages capable of resetting themselves using dummy carry signals, eliminating the need for a separate global reset line, and reducing the channel width of transistors in these stages to prevent multiple outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dummy stages are used in the gate driver circuit during cutting, then the panel can be cuttable and manufactured in various sizes, but multiple outputs occur in the dummy stage causing excessive gate bias and element deterioration
Solution Approach 1:
The patent extracts the reset function from a global reset line and integrates it into the dummy stage itself. The dummy stage contains a reset circuit that uses the dummy carry signal to reset its own Q node, eliminating the need for external global reset wiring and preventing multiple output issues during cutting operations.
Solution Approach 2:
The dummy stage is designed to be self-resetting by using its own dummy carry signal output to control the reset circuit. This self-service mechanism allows the dummy stage to automatically reset its Q node without requiring external intervention, ensuring stable operation during panel cutting and manufacturing.
2Reliability
If a separate global reset line is used to reset dummy stages, then the gate driver circuit can be reset properly, but the bezel size increases and interference noise occurs
Solution Approach 1:
The patent merges the reset function with the dummy stage by integrating the reset circuit directly into the dummy stage structure. The reset circuit shares the Q node and uses the dummy carry signal already present in the dummy stage, eliminating the need for a separate global reset line and reducing bezel area.
Solution Approach 2:
The dummy carry signal serves multiple functions: it is used for normal signal propagation through the gate driver circuit and simultaneously serves as the reset signal for the dummy stage. This multi-functionality eliminates the need for dedicated reset wiring, reducing bezel size and interference noise.
3Adaptability or versatility
If multiple outputs occur in the dummy stage, then the circuit can handle cutting operations, but excessive gate bias is applied to transistors causing element deterioration
Solution Approach 1:
The patent implements feedback by using the dummy carry signal output from the dummy stage to control the reset circuit. This feedback mechanism ensures that the Q node is properly reset based on the actual signal state, preventing multiple outputs and excessive gate bias application to transistors during cutting operations.
Data Source
AI summary
A gate driver circuit capable of preventing multiple outputs of a dummy stage to prevent malfunction thereof due to deterioration of an element, and a display device including the gate driver circuit. The gate driver circuit includes a plurality of stages for driving a plurality of gate lines, wherein the plurality of stages include: an X-th stage configured to output a carry signal and at least one gate signal; and a dummy stage configured to output a dummy carry signal to the X-th stage in response to the carry signal, wherein the dummy stage is configured to reset the dummy stage in response to the dummy carry signal.