GOA Circuit Flexible Scanning for Strip Screens
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Solution Overview
Problem
Existing GOA circuits face challenges when cutting display panels into strip screens of varying aspect ratios, as the scanning direction is fixed, and the start signal connection issues prevent the GOA circuit from functioning properly, especially when cutting in the middle of the panel.
Innovation Solution
A GOA circuit design that includes cascaded GOA units with specific thin film transistor configurations and voltage level settings allows for flexible scanning directions by altering the relative voltage levels between scan direction signals, enabling the panel to be cut into strip screens of any aspect ratio, and additional TFTs are used to ensure proper start signal connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display panel is cut into strip screens of varying aspect ratios, then the adaptability of the GOA circuit is improved, but the start signal connection reliability deteriorates
Solution Approach 1:
The GOA circuit is divided into multiple independently controllable GOA units, each capable of receiving start signals separately. This segmentation allows the circuit to adapt to different cutting positions and aspect ratios while maintaining reliable operation through independent unit activation.
Solution Approach 2:
The scanning direction of the GOA circuit is made dynamically adjustable through controllable switches that can reverse the scanning direction. This dynamic capability enables the same circuit to adapt to different aspect ratios and cutting positions without compromising start signal connection reliability.
2Device complexity
If the scanning direction is fixed in conventional GOA circuits, then the circuit structure is simplified, but the ability to produce strip screens of any aspect ratio is limited
Solution Approach 1:
The GOA circuit incorporates controllable switches that enable dynamic reversal of the scanning direction. This dynamic feature allows the same simplified circuit structure to produce strip screens of any aspect ratio by adjusting the scanning direction according to the cutting position.
Solution Approach 2:
The GOA circuit is designed with multi-functional capability to handle both conventional fixed aspect ratio displays and variable aspect ratio strip screens. The inclusion of direction control switches enables the circuit to perform multiple functions without significantly increasing structural complexity.
3Device complexity
If the start signal is connected only at the first and last stages of the GOA circuit, then the circuit design is simplified, but cutting in the middle of the panel causes the GOA circuit to fail
Solution Approach 1:
The GOA circuit is segmented into multiple independently controllable units, each capable of receiving start signals. This segmentation ensures that even if cutting occurs in the middle of the panel, the remaining units can still receive start signals and function properly.
Solution Approach 2:
Different regions of the GOA circuit are equipped with different start signal connection capabilities based on their local requirements. Units that may be affected by cutting are provided with additional start signal inputs, ensuring local reliability while maintaining overall circuit simplicity.
Data Source
AI summary
The invention provides a GOA circuit for display panel. The GOA circuit comprises a plurality of cascaded GOA units, for n and m, a pull-up control circuit of n-th stage GOA unit comprising: a first TFT(T1) having gate connected to (n+m)-th stage scan signal, source and drain respectively connected to high voltage and gate signal node; a second TFT(T2), having floating gate and reserved welding pad for connecting start signal(STV), source and drain respectively connected to high voltage and gate signal node; a pull-down control circuit comprising: a third TFT(T4), having gate connected to (n−m)th stage scan signal, source and drain respectively connected to n-th stage scan signal and low voltage; a fourth TFT(T5), having gate connected to (n−m)th stage scan signal, source and drain connected to gate signal node and low voltage respectively. The invention realizes the cutting of display panel into strip screens of any aspect ratio.