GOA Circuit Signal Reduction for Narrow Bezel Displays
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Solution Overview
Problem
The existing gate driver on array (GOA) circuit requires multiple signals, leading to increased signal traces in the bezel area, which hinders the achievement of a narrow bezel design in display technologies.
Innovation Solution
The proposed GOA circuit simplifies signal traces by integrating a scan control module, anti-backfill module, cascading reset module, gate signal output module, and additional pull-down and system reset modules, reducing the number of signals needed and optimizing signal pathways to achieve a narrow bezel design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional GOA circuit uses multiple control signals (U2D, D2U, VGH, VGL, G(N-1), G(N+1), CK(N), CK(N+1), Reset, GAS), then the GOA circuit can achieve complete gate scan driving functions, but the number of signal traces in the bezel area increases, making it difficult to achieve narrow bezel design
Solution Approach 1:
The patent combines multiple independent control signals into a reduced set of integrated signals. Specifically, the forward scan control (U2D) and backward scan control (D2U) are merged into a unified scan control mechanism, and the constant high-level signal (VGH) is used to replace multiple separate control lines. This merging reduces the total number of signal traces required in the bezel area while maintaining complete gate scan driving functionality through the integrated GOA units.
Solution Approach 2:
The patent implements multi-functionality by designing GOA units that can perform multiple functions using a reduced signal set. The constant high-level signal (VGH) serves multiple purposes including level shifting, signal regeneration, and control across different stages. The cascading structure allows each GOA unit to function as both a receiver of control signals and a generator of drive signals for adjacent units, reducing the need for separate dedicated control traces for each function.
2Area of stationary object
If GOA circuit uses constant high-level signal VGH connected to multiple transistors, then the circuit can achieve simplified signal traces and narrow bezel, but the electrical level control and signal stability become more challenging
Solution Approach 1:
The patent applies local quality by connecting the constant high-level signal (VGH) to specific drains of transistors (first transistor and second transistor) rather than universally to all circuit nodes. This localized application ensures that VGH provides the necessary high-level control where needed while allowing other parts of the circuit to maintain appropriate signal levels independently. The constant low-level signal (VGL) is similarly applied locally to specific nodes requiring pull-down control, ensuring signal stability through targeted rather than universal signal distribution.
Data Source
AI summary
A gate driver on array (GOA) circuit is provided. The GOA circuit includes a plurality of cascading GOA units. One of the GOA unit includes: a scan control module, an anti-backfill module connected to a constant high-level signal and the scan control module, a cascading reset module, and a gate signal output module. Base on functions of prior art solution, the provided GOA circuit of the disclosure reduces two types of signal to simplify signal traces at the bezel to realize a narrow bezel design.