Gate Driving Unit Repair Shift Register Signal Distortion
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Solution Overview
Problem
The existing gate driving unit for liquid crystal display devices faces issues with signal distortion due to the distance between the redundant repair shift register and the disordered shift register, particularly in Gate in Panel (GIP) type LCDs, where shift registers and TFTs are formed at the substrate edges, leading to increased load on input and output lines.
Innovation Solution
A gate driving unit with a redundant repair shift register and a method that involves first and second clock signal lines, shift registers, switches to connect clock signals, and additional switches to reroute gate lines, allowing for efficient repair of disordered shift registers by isolating and rerouting signals to minimize signal delay and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundant repair shift register is used to repair disordered shift registers, then the reliability of the gate driving unit is improved, but signal distortion occurs due to the distance between the redundant repair shift register and the disordered shift register
Solution Approach 1:
The patent introduces a buffer amplifier as an intermediary component between the redundant repair shift register and the disordered shift register. This buffer amplifier serves as a mediator that receives the scanning signal from the redundant repair shift register, amplifies it, and outputs it to the disordered shift register, thereby reducing signal distortion caused by the distance between these components.
Solution Approach 2:
The patent changes the electrical parameters of the connection between the redundant repair shift register and the disordered shift register by introducing a buffer amplifier. This modification alters the signal transmission characteristics, improving signal quality and reducing distortion while maintaining the repair function.
2Device complexity
If shift registers and TFTs are formed at the substrate edges in GIP type LCDs, then the device structure is simplified, but the load on input and output lines increases causing signal distortion
Solution Approach 1:
The buffer amplifier acts as an intermediary that compensates for the increased load on input and output lines caused by the edge placement of shift registers and TFTs. It amplifies the scanning signal to maintain signal strength and reduce distortion despite the higher load conditions in GIP type LCD structures.
3Loss of information
If the distance between the redundant repair shift register and the disordered shift register is reduced, then signal distortion is minimized, but the repair function effectiveness is compromised
Solution Approach 1:
The buffer amplifier serves as a mediator that enables the redundant repair shift register to effectively repair the disordered shift register even when positioned at a distance. It amplifies the scanning signal to maintain sufficient signal strength over the connection path, ensuring the repair function remains effective without requiring the components to be in close proximity.
Data Source
AI summary
A gate driving unit for a liquid crystal display device including a plurality of liquid crystal pixels, first to Nth gate lines, a plurality of liquid crystal capacitors and a plurality of thin film transistors, includes first and second clock signal lines for providing first and second clock signals; first to Nth shift registers respectively corresponding to the first to Nth gate lines, the first to Nth shift registers receiving one of the first clock signal and the second clock signal and outputting first to Nth scanning signals, respectively; a redundant repair shift register as (N+1)th shift register receiving one of first and second clock signals and outputting a repair scanning signal; a plurality of first switches for respectively connecting one of the first and second clock signal lines to the first to Nth shift registers and the redundant repair shift register; a plurality of second switches for respectively switching a connection of the first to Nth shift registers with the first to Nth gate lines; and a plurality of third switches for respectively switching a connection of the second to Nth shift registers and the redundant repair shift register with the first to Nth gate lines, wherein N is positive integer.