Gate Driver Circuit Stabilizing Q Node Voltage for Uniform Display Luminosity
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Solution Overview
Problem
Display devices with flat panels, such as liquid crystal and organic light-emitting displays, face image quality issues due to output differences in gate signals, leading to uneven luminosity across lines, causing some areas to appear brighter or darker than intended.
Innovation Solution
A gate driver circuit with multiple stage circuits, including M nodes, Q nodes, and QB nodes, is implemented to reduce output differences by stabilizing voltage levels and bootstrapping signals, ensuring uniform gate signals across all lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional gate driver circuits are used, then the device structure is simple, but output differences between gate signals occur causing non-uniform luminosity
Solution Approach 1:
The gate driver circuit is divided into multiple stage circuits (first stage circuit, second stage circuit, third stage circuit, etc.), where each stage circuit generates gate signals for specific gate lines. This segmentation allows independent optimization of each stage to reduce output differences while maintaining overall system manageability.
Solution Approach 2:
Different stage circuits are configured with different circuit structures tailored to their specific functions. For example, the first stage circuit uses a different configuration than the second stage circuit, allowing each stage to be optimized for its specific role in generating uniform gate signals, thereby improving overall output uniformity.
2Reliability
If gate signal output differences are reduced through multiple stage circuits, then image display quality is improved, but the circuit structure becomes more complex
Solution Approach 1:
Multiple stage circuits are merged into a single integrated gate driver circuit system that shares common power supply lines (EVDD, EVSS) and control signals. This merging approach improves image display quality through coordinated operation of multiple stages while avoiding the complexity of completely separate circuits.
Solution Approach 2:
The gate driver circuit is designed with universal components and structures that can be replicated across multiple stages. Each stage circuit uses similar building blocks (transistors, capacitors, resistors) configured in different patterns, allowing the system to achieve high reliability through multi-stage operation without proportionally increasing overall complexity.
Data Source
AI summary
A gate driver circuit can include a plurality of stage circuits, in which each of the plurality of stage circuits supplies a gate signal to gate lines arranged in a display panel, and includes an M node, a Q node, a QH node, a QB node, a line selector, a Q node controller, a Q node and QH node stabilizer, an inverter, a QB node stabilizer, a carry signal output circuit portion, a gate signal output circuit portion, and a Q node bootstrapper, in which the Q node bootstrapper is connected between the carry signal output circuit portion and the gate signal output circuit portion, or the gate signal output circuit portion is connected between the carry signal output circuit portion and the Q node bootstrapper.