GOA Circuit Bootstrap Unit Voltage Boosting
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Solution Overview
Problem
The existing GOA circuit in liquid crystal display devices experiences low driving performance due to a low voltage at node Q, which affects the overall performance of the display.
Innovation Solution
The proposed GOA circuit incorporates a bootstrap unit with capacitors and thin-film transistors to enhance the voltage at node Q through capacitive coupling, improving the driving capability by boosting the voltage and enabling better control of gate signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional GOA circuit is used, then the display device can be manufactured with simplified process and improved productivity, but the driving performance is low due to low voltage at node Q
Solution Approach 1:
The GOA circuit is divided into multiple stages, with each stage independently driving a corresponding stage of scanning lines. This segmentation allows the voltage boosting mechanism to be applied locally at each stage without requiring complete circuit redesign, thus improving driving performance while maintaining manufacturing simplicity
Solution Approach 2:
The patent combines multiple circuit components (capacitors, thin-film transistors, pull-up units, pull-down units) into a composite GOA circuit structure. The bootstrap capacitor and coupling capacitor work together with the thin-film transistors to create a voltage boosting mechanism that enhances driving performance without complicating the manufacturing process
2Reliability
If the voltage at node Q is increased to improve driving performance, then the control of gate signals becomes more effective, but the circuit complexity increases
Solution Approach 1:
The bootstrap capacitor and coupling capacitor are integrated into the existing GOA circuit structure, sharing nodes and components with the pull-up and pull-down units. This merging approach allows voltage boosting functionality to be added without creating completely separate circuits, thus limiting the increase in complexity
Solution Approach 2:
The thin-film transistors in the circuit serve multiple functions: they act as switches for signal transmission, as voltage control elements for the capacitors, and as part of the pull-up/pull-down mechanisms. This multi-functionality reduces the need for additional dedicated components, thereby controlling circuit complexity while achieving voltage boosting
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The enhanced voltage at node Q significantly improves the driving performance of the GOA circuit, allowing for more effective control of scanning lines and improved display quality.
Implementation Method 1
The first capacitor and the second capacitor are used as coupling capacitors for node Q, by means of which capacitive coupling for node Q can be performed twice so as to boost a voltage at node Q
Data Source
AI summary
Disclosed are a GOA circuit and a liquid crystal display device. The GOA circuit includes multistage GOA sub-circuits. Each stage of GOA sub-circuit includes a pull-up control unit, a pull-up unit, a transfer unit, a pull-down unit, a pull-down holding unit and a bootstrap unit. The bootstrap unit includes a first capacitor, a second capacitor, a first thin-film transistor and a second thin-film transistor. The first capacitor and the second capacitor are used as coupling capacitors for node Q so as to boost a voltage at node Q and enhance driving capability of the GOA circuit.