LCD Gate Driving Circuit Reset Layout Without Dummy Registers
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Solution Overview
Problem
The existing Gate In Panel (GIP) type liquid crystal display (LCD) devices face challenges in ensuring a design margin and reducing fabricating costs due to the need for dummy shift resistors and dummy gate driving units, which increase design area requirements and memory capacity in the timing controller, and can lead to degraded signal output over time.
Innovation Solution
A gate driving circuit with a shift resistor having N stages driven by a start signal and first to fourth clock signals, where an externally input reset signal is applied to the N−1th and Nth stages, allowing the generation of a reset signal using the start signal, which is converted from low to high level when the fourth clock signal transitions from high to low, enabling direct input of start and reset signals to the bidirectional gate driving circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dummy shift registers and dummy gate driving units are added to provide reset signals to the N-1th and Nth stages, then the reset function is achieved, but the design area increases and fabricating cost increases
Solution Approach 1:
The start signal is made to serve dual purposes: it both initiates the gate driving sequence and provides the reset function for the N-1th and Nth stages. By configuring the circuit so that the start signal automatically resets these stages after completing its primary function, the patent eliminates the need for separate dummy shift registers and dummy gate driving units, thereby reducing design area while maintaining reliable reset functionality
Solution Approach 2:
The reset function is extracted from the traditional dummy shift register structure and integrated into the main shift register operation. By taking out the reset provision function from the dummy components and merging it with the start signal's operation, the patent removes the need for separate dummy structures, reducing both design area and fabricating cost
2Reliability
If dummy shift registers and dummy gate driving units are added to provide reset signals to the N-1th and Nth stages, then the reset function is achieved, but fabricating cost increases
Solution Approach 1:
The start signal is made to serve dual purposes: it both initiates the gate driving sequence and provides the reset function for the N-1th and Nth stages. By configuring the circuit so that the start signal automatically resets these stages after completing its primary function, the patent eliminates the need for separate dummy shift registers and dummy gate driving units, thereby reducing design area while maintaining reliable reset functionality
Solution Approach 2:
The reset function is extracted from the traditional dummy shift register structure and integrated into the main shift register operation. By taking out the reset provision function from the dummy components and merging it with the start signal's operation, the patent removes the need for separate dummy structures, reducing both design area and fabricating cost
3Reliability
If dummy shift registers are used on the LC panel, then reset signals are provided to N-1th and Nth stages, but yield decreases due to reduced design margin
Solution Approach 1:
The start signal is made to serve dual purposes: it both initiates the gate driving sequence and provides the reset function for the N-1th and Nth stages. By configuring the circuit so that the start signal automatically resets these stages after completing its primary function, the patent eliminates the need for separate dummy shift registers and dummy gate driving units, thereby reducing design area while maintaining reliable reset functionality
Solution Approach 2:
The reset function is extracted from the traditional dummy shift register structure and integrated into the main shift register operation. By taking out the reset provision function from the dummy components and merging it with the start signal's operation, the patent removes the need for separate dummy structures, reducing both design area and fabricating cost
Data Source
AI summary
A gate driving circuit is capable of improving yield by virtue of acquisition of a design margin and reduction of a fabricating cost. The gate driving circuit includes a shift resistor having N stages driven by a start signal and first to fourth clock signals output from the exterior, and an externally input reset signal is applied to reset terminals of the N−1th stage and the Nth stage of the shift resistor, respectively.