Shift Register Feedback Signal Path Design
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Solution Overview
Problem
Conventional shift registers in LCD gate driving circuits have long response times due to increased workload on the output end, which weakens feedback signals and prolongs the falling time of gate signals, leading to inefficiency and reduced lifespan of TFTs.
Innovation Solution
The shift register design includes a signal generating circuit with a first and second switch for generating output signals, a driving circuit for controlling these switches, a reset circuit for turning off and resetting signals, and a control switch for feedback-based resetting, where the feedback signal is generated by the first switch, reducing the load on the output end and allowing for faster signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the output end generates gate signals for driving the display array, then the display function is achieved, but the workload on the output end increases and response time lengthens
Solution Approach 1:
The patent divides the signal generating circuit into two separate switches: a first switch for generating feedback signals and a second switch for generating gate signals. This segmentation allows the feedback signal generation to occur independently without being constrained by the gate signal output workload, thereby reducing the response time while maintaining full display driving capability.
2Reliability
If the feedback signal is transmitted through the output end, then the control function is achieved, but the feedback signal strength weakens and falling time increases
Solution Approach 1:
The patent creates separate signal paths by using a first switch dedicated to feedback signal generation and a second switch for gate signal output. The feedback signal is generated directly from the clock signal through the first switch without passing through the output end, maintaining strong signal strength and fast falling time while still providing reliable feedback control.
Solution Approach 2:
The first switch acts as an intermediary that generates feedback signals independently from the output end circuitry. This intermediary structure allows the feedback signal to be generated with full strength directly from the clock signal without being degraded by the output driving workload, while still achieving the necessary control function.
Data Source
AI summary
A shift register includes a signal generating circuit, a driving circuit, a reset circuit, and a control switch. The signal generating circuit includes a first switch for generating a first output signal according to a clock signal while the first switch is turned on, and a second switch coupled to an output end of the shift register for generating and transmitting a second output signal to the output end of the shift register according to the clock signal while the second switch is turned on. The driving circuit is for controlling the first and second switches according to an input signal received from an input end of the shift register. The reset circuit is for turning off the first and second switches and resetting the output signal outputted by the output end. The control switch is for resetting the output signal outputted by the output end.