Gate Drive Shift Register Discharge Circuit for LCD Signal Delay
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Solution Overview
Problem
The existing gate drive devices for liquid crystal displays suffer from significant signal delay and high power consumption due to large charged and discharged amounts, with the high level signals not being sufficiently utilized.
Innovation Solution
The introduction of first and second discharge circuit modules between the signal output terminals of adjacent shift register units and between clock signal lines, respectively, to facilitate the discharge of high level signals, reducing signal delay and optimizing power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If each signal output terminal is directly discharged to a low level after being charged to a high level by a power supply, then the signal output terminal can provide a high level signal, but the charged and discharged amounts are large causing power consumption to be large
Solution Approach 1:
The patent introduces a discharge circuit module as an intermediary component between the signal output terminal and the power supply. This module includes a discharge transistor that provides a controlled discharge path, allowing the signal output terminal to discharge to a mid-level voltage rather than directly to ground. This intermediary discharge mechanism reduces the voltage swing amplitude, thereby reducing both the charged and discharged amounts and lowering power consumption while still maintaining the necessary high level signal output capability.
2Device complexity
If the gate drive signal is generated using conventional shift register units, then the circuit structure is simple, but the delay of the gate drive signal is large
Solution Approach 1:
The patent segments the discharge function from the main shift register operation by introducing a separate discharge circuit module. This segmentation allows the discharge operation to be independently optimized and controlled, reducing its impact on the overall signal propagation delay. The discharge transistor operates in parallel with the main signal path, creating separate functional segments that can be timed independently to minimize delay while keeping the overall circuit structure relatively simple.
Data Source
AI summary
A gate drive device for liquid crystal display including multiple stages of shift register units and plurality of clock signal lines, said plurality of clock signal lines all being connected to the multiple stages of shift register units, to enable the multiple stages of shift register units to generate a gate drive signal, each stage of shift register unit all includes a signal output terminal, a first discharge circuit modular is connected between the signal output terminal for the i-th stage of shift register unit and the signal output terminal for the (i+1)-th stage of shift register unit, said first discharge circuit modular is used to cause the charges of a high level signal outputted from the signal output terminal for the i-th stage of shift register unit to be discharged to the signal output terminal for the (i+1)-th stage of shift register unit.