Shift Register Feedback Switching to Protect TFT Lifespan
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Solution Overview
Problem
The existing shift registers in LCD gate driving circuits face reduced efficiency and shortened operation lifespan due to continuous operation of TFTs under the drive of both clock signals, leading to increased electrical potential and potential damage.
Innovation Solution
The shift register design includes an additional feedback circuit that is activated by a signal from the next stage shift register, allowing the feedback circuit to operate only during specific cycles, thereby reducing continuous operation and enhancing the lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the feedback circuit is continuously driven by clock signals, then the shift register can maintain continuous operation, but the TFT efficiency is reduced and operation lifespan is shortened
Solution Approach 1:
The feedback circuit is activated periodically based on clock signal phases rather than continuously. The control switch uses phase information from clock signals to enable the feedback circuit only during specific phases, allowing TFTs to rest during other phases, thus extending operation lifespan while maintaining continuous shift register functionality
Solution Approach 2:
The feedback circuit's operation state is dynamically controlled based on real-time clock signal phases. The control switch adjusts the feedback circuit's activation state according to the dynamic phase changes of clock signals, optimizing TFT usage and preventing continuous operation that would reduce lifespan
2Ease of operation
If the feedback circuit operates continuously, then control and output switches can be activated, but electrical potential increases and may cause damage
Solution Approach 1:
The feedback circuit operates periodically rather than continuously, with activation synchronized to specific clock signal phases. This periodic operation allows electrical potential to dissipate during inactive phases, preventing accumulation that would cause damage while still enabling switch activation when needed
Solution Approach 2:
The control switch is designed to prevent harmful high electrical potential from occurring in the first place by controlling the feedback circuit's activation timing. By enabling the feedback circuit only during safe phases and preventing simultaneous activation that would cause potential buildup, the design eliminates the harmful effect before it can occur
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 according to a first clock signal while the signal generating circuit is turned on; a driving circuit, electrically coupled to the signal generating circuit, for generating a driving signal to control the signal generating circuit according to an input signal received from an input end of the shift register; a feedback circuit, electrically coupled to a next stage shift register, for transmitting a control signal while the feedback circuit is turned on by the next stage shift register; and a control switch, electrically coupled to the signal generating circuit and the feedback circuit, for turning off the signal generating circuit while the control switch is turned on by the control signal from the feedback circuit.