GOA Circuit Topology for Simplified Negative Pulse Output
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Solution Overview
Problem
The design complexity of existing Gate Driver on Array (GOA) circuits increases with the requirement to generate negative pulse waveforms in OLED display panels, making it challenging to simplify the circuit design.
Innovation Solution
A multi-stage GOA circuit design incorporating input, output, pull-down, inversion, clamping modules, and a bootstrap capacitor, with specific transistor connections and voltage control mechanisms, enables the generation of both positive and negative pulse waveforms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing GOA circuit designs are used to generate negative pulse waveforms, then the required signal waveforms are achieved, but the design complexity increases
Solution Approach 1:
The patent applies inversion by using a p-type transistor instead of the conventional n-type transistor as the main switching element in the GOA circuit. This fundamental inversion allows the circuit to naturally generate negative pulse waveforms that were previously difficult to achieve, while simultaneously reducing the overall circuit complexity. The p-type transistor's characteristics enable direct coupling with OLED pixels and simplify the signal generation mechanism for negative pulses.
Solution Approach 2:
The patent implements multi-functionality by designing a unified GOA circuit architecture that can generate both positive and negative pulse waveforms using the same p-type transistor-based structure. The circuit universally handles different signal types (positive pulses, negative pulses, and scanning signals) through a single consistent design approach, eliminating the need for separate circuit paths for different waveform types.
2Device complexity
If conventional GOA circuits are used, then the circuit structure is simple, but generating negative pulse waveforms becomes complex
Solution Approach 1:
The patent applies parameter changes by fundamentally altering the transistor type parameter from n-type to p-type. This single parameter change transforms the circuit's electrical characteristics, enabling it to naturally produce negative pulse waveforms with a simple structure. The p-type transistor's hole conduction mechanism and voltage characteristics inherently support negative pulse generation without adding circuit complexity.
Data Source
AI summary
Embodiments of the application provide a gate driver on array (GOA) circuit and display apparatus, which is capable of outputting signals of positive and negative pulse waveforms using a simplified circuit design.