Shift Register Self-Feedback Circuit for Faster Gate Signal Reset
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Solution Overview
Problem
The existing shift registers in LCD gate driving circuits face increased workload and reduced lifespan due to the need for feedback signals, leading to longer rising and falling times of gate signals and potential damage from the absence of feedback in the last stage, which shortens the operation life span.
Innovation Solution
Incorporating a feedback circuit within each shift register that generates a feedback signal to control the primary reset circuit, allowing self-feedback and eliminating the need for a direct feedback end, thereby reducing the workload on the output end and enabling the primary reset circuit to operate independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback signals are transmitted between stage shift registers, then the shift register can maintain proper operation, but the workload on the output end increases and rising/falling times are prolonged
Solution Approach 1:
The patent implements a feedback circuit within each stage shift register that generates a feedback signal to control the primary reset circuit. This internal feedback mechanism eliminates the need for external feedback connections between stages, allowing the shift register to maintain proper operation while reducing the workload on output ends and shortening rising/falling times of gate signals.
2Reliability
If external feedback connections are used between stage shift registers, then feedback function is achieved, but the last stage shift register lacks feedback and suffers from reduced lifespan
Solution Approach 1:
The patent enables each stage shift register to be self-sufficient by incorporating an internal feedback circuit that generates its own feedback signal. This self-service approach eliminates the dependency on external feedback connections, particularly benefiting the last stage shift register which previously lacked feedback and suffered from reduced lifespan. Each stage now maintains proper operation independently.
3Reliability
If primary reset circuit operates continuously, then reset function is maintained, but noise interference increases and product lifespan is reduced
Solution Approach 1:
The patent controls the primary reset circuit to operate periodically rather than continuously by using the feedback signal to enable it only when a gate signal is received from a next stage shift register. This periodic operation maintains the necessary reset function while significantly reducing noise interference and extending product lifespan.
Data Source
AI summary
A shift register includes a signal generating circuit for generating an output signal at an output end of the shift register in response to a clock signal while the signal generating circuit is turned on, a driving circuit electrically coupled to the signal generating circuit for controlling the signal generating circuit in response to an input signal received from an input end of the shift register, a primary reset circuit electrically coupled to the signal generating circuit for turning off the signal generating circuit and resetting the output signal from the output end, and a feedback circuit electrically coupled to the output end and the major reset circuit for controlling the primary reset circuit in response to the output signal and the clock signal.