Shift Register Unit with Discharge Capacitor for Compact GOA Circuit
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Solution Overview
Problem
Existing shift register units in display devices, particularly in TFT-LCDs, face challenges with large transistor sizes due to high output voltage requirements, leading to increased space occupation and power consumption, which complicates the bonding process and limits the design of gate driving circuits.
Innovation Solution
A shift register unit is designed with a discharge capacitor, reducing the number of transistors and incorporating modules like input, pull-up, pull-down, reset, and noise reduction modules, which utilize transistors and capacitors to manage signal levels and reduce transistor size, thereby minimizing space occupation and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large number of thin film transistors are used in the GOA circuit to achieve symmetrical design and save bonding area, then the bonding area is reduced and symmetrical design is achieved, but the circuit occupies a relatively large space due to the large number of transistors and large transistor sizes
Solution Approach 1:
The patent changes the control terminal voltage parameter from high level to intermediate level (first voltage level between high and low levels). This parameter change allows the transistor to achieve proper switching function with a smaller size, as the intermediate voltage level provides sufficient control without requiring the large transistor size that would be needed for high-level control
Solution Approach 2:
The patent segments the voltage control into multiple levels (high level, intermediate first voltage level, and low level). By using the intermediate first voltage level for the control terminal, the circuit achieves proper transistor switching with reduced transistor size, thereby reducing the space occupied by the GOA circuit while maintaining the bonding area advantages
2Loss of time
If the control terminal voltage is set to high level to ensure output delay is within normal work range, then the output delay is controlled, but the transistor size becomes relatively large, increasing the space occupied by the GOA circuit
Solution Approach 1:
The patent changes the control terminal voltage from high level to intermediate first voltage level. This parameter change allows the transistor to achieve proper switching speed (controlling output delay) without requiring the large transistor size that would be needed for high-level control, thus resolving the contradiction between output delay control and transistor size
3Measurement precision
If more outputs are added at the gate driving circuit and source driving circuit to achieve high resolution, then the resolution is improved, but the length of the driving circuit is increased, complicating the bonding process
Solution Approach 1:
The patent segments the driving circuit into multiple shift register units, each handling a portion of the output signals. This segmentation allows the circuit to achieve high resolution with multiple outputs while keeping each individual unit compact and manageable, thereby reducing the overall circuit length and simplifying the bonding process
Data Source
AI summary
The present invention provides a shift register unit, a gate driving circuit and a display device, which belongs to the field of display technology. The shift register unit of the present invention comprises: an input module, a pull-up module, a pull-down control module, a pull-down module, a reset module and a discharge module.