Multi-Stage Gate Driving Circuit for Stable Gate Signal Timing
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Solution Overview
Problem
Existing display apparatuses face challenges in stably outputting gate signals due to variations in voltage levels and timing of control signals, which can affect the performance and stability of the gate driving circuit.
Innovation Solution
The gate driving circuit incorporates a design with multiple stages, each comprising controllers and output portions that utilize transistors and capacitors to manage voltage levels and signal timing, ensuring stable output of gate signals through precise control of control nodes and synchronized clock signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gate driving circuit uses simple voltage control, then the circuit complexity is low, but the gate signal output stability deteriorates due to voltage level variations
Solution Approach 1:
The gate driving circuit is divided into multiple stages, with each stage independently controlling voltage levels for different periods. Each stage includes separate control nodes (first control node and second control node) that are independently managed by first and second controllers, allowing precise voltage stabilization without requiring complex overall circuit design.
Solution Approach 2:
The circuit dynamically switches between different voltage levels at control nodes during display period and sensing period. The first controller and second controller alternately activate to charge or discharge capacitors, creating time-varying voltage levels that adapt to different operational requirements while maintaining stability.
2Reliability
If the gate driving circuit uses multiple voltage levels for control nodes, then the gate signal stability improves, but the device complexity increases
Solution Approach 1:
The first and second controllers serve multiple functions: they control voltage levels at control nodes, manage capacitor charging/discharging, and generate gate signals. The same transistor structures are reused across different stages, reducing overall device complexity while maintaining multiple voltage levels for stable operation.
Solution Approach 2:
The circuit uses its own output signals and clock inputs to automatically control the voltage levels at control nodes. The first controller and second controller use the input clock signals and carry signals to self-regulate the charging and discharging of capacitors, eliminating the need for external complex control mechanisms.
3Manufacturing precision
If the circuit uses separate control nodes with different voltage levels, then the signal timing precision improves, but the manufacturing complexity increases
Solution Approach 1:
Different voltage levels are applied locally at different control nodes (first control node and second control node) within each stage, allowing precise timing control for specific signal transitions. Each node's voltage level is optimized for its specific function, improving timing precision without requiring complex global circuit modifications.
Data Source
AI summary
A gate driving circuit includes a plurality of stages, wherein each of the plurality of stages includes transistors that control the voltages of control nodes by a carry signal output from a previous stage and a carry signal output from a next stage, and a transistor that reduces leakage current of a first control node.