Gate Driving Circuit Reducing TFT Count for Ultra-Narrow Frames
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Solution Overview
Problem
Existing gate driving circuits for liquid crystal displays require a large number of thin film transistor (TFT) elements, leading to increased layout space and hindering the achievement of ultra-narrow frame designs, which reduce the screen-to-body ratio in displays.
Innovation Solution
A gate driving circuit with cascaded gate driving units, each driving two scan lines, utilizing a pull up controlling module, pull up modules, down transmitting modules, bootstrap capacitors, and a pull down holding module, shared among stages to reduce the number of components and achieve ultra-narrow frame designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each stage GOA circuit includes the same module with a larger number of thin film transistor elements, then the circuit can drive scan lines effectively, but the layout space of the GOA circuit increases
Solution Approach 1:
The patent merges the functionality of multiple GOA circuit modules into a single shared module that can drive multiple scan lines. Specifically, the pull-up controlling circuit, down transmitting portion, bootstrap capacitor, and pull-down holding module are shared among multiple scan line driving units, reducing the total number of TFT elements required while maintaining reliable scan line driving capability.
Solution Approach 2:
The shared GOA circuit module is designed with multi-functionality to serve multiple scan lines simultaneously. The pull-up controlling circuit generates control signals for multiple scan lines, the down transmitting portion distributes cascading signals across multiple stages, and the pull-down holding module maintains multiple output nodes, enabling one module to perform the work of several dedicated modules.
2Length of moving object
If the frame is designed to be as narrow as possible, then the screen-to-body ratio is increased, but the GOA circuit layout space becomes constrained
Solution Approach 1:
By merging multiple GOA circuit functionalities into shared modules, the patent significantly reduces the total component count and layout area required for the GOA circuit. This enables the frame to be designed narrower while still providing sufficient layout space for the driving circuitry, thereby increasing the screen-to-body ratio.
3Area of stationary object
If the number of thin film transistor elements is reduced, then the layout space decreases, but the circuit complexity may increase
Solution Approach 1:
The shared GOA module is designed with multi-functional capabilities that reduce the number of discrete components needed. The pull-up controlling circuit serves multiple scan lines, the down transmitting portion handles multiple cascading signals, and the pull-down holding module manages multiple output nodes, simplifying the overall circuit structure while reducing layout space requirements.
Data Source
AI summary
A gate driving circuit is provided, where includes a plurality of gate driving units connected in cascade, each of the gate driving units is used to drive two scan lines arranged continuously, a gate driving signal of a first scan line and a first cascading signal are respectively transmitted by a first pull up module and a first down transmitting module, and a gate driving signal of a second scan line and a second cascading signal are respectively transmitted by a second pull up module and a second down transmitting module. By the above manner, the disclosure is capable of decreasing a component quantity of GOA circuit, thus achieving the ultra-narrow frame design.