Shift Register Voltage Regulator Leakage Reduction
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Solution Overview
Problem
Existing shift register circuits suffer from efficiency decrements and power loss due to leakage current, leading to inaccurate timing sequences, which can result in horizontal lines on LCD displays and decreased display quality.
Innovation Solution
A shift register circuit design incorporating a voltage regulator with a coupling element, switch, and switch control unit that generates a periodic reverse bias to reduce leakage current, comprising an input circuit to control voltage based on scan signals and an output circuit to manage clock signals, thereby stabilizing voltage levels and preventing current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional shift register circuits are used, then the circuit structure is simple, but leakage current occurs causing efficiency decrement and power loss
Solution Approach 1:
The voltage regulator is configured to regulate the voltage at the control node before the transistor switches are activated. By preliminarily adjusting the voltage level, the transistor operates in an optimized region that minimizes leakage current while maintaining switching functionality, thus reducing power loss without significantly increasing circuit complexity
Solution Approach 2:
The invention dynamically changes the voltage parameter at the control node using the voltage regulator. By adjusting the voltage level based on circuit operating conditions, the transistor leakage current is reduced, thereby decreasing power loss while maintaining the overall circuit structure
2Ease of operation
If conventional shift register circuits are used, then the circuit operation is straightforward, but timing sequence accuracy deteriorates due to leakage current
Solution Approach 1:
The voltage regulator preliminarily adjusts the control node voltage before transistor switching operations. This preliminary voltage optimization ensures that transistors switch at the correct timing with minimal leakage, maintaining timing sequence accuracy while keeping the circuit operation straightforward
Solution Approach 2:
The voltage regulator implements feedback control to monitor and adjust the control node voltage. This feedback mechanism compensates for voltage variations and leakage effects, ensuring accurate timing sequences are maintained throughout circuit operation without complicating the operational procedure
3Device complexity
If conventional shift register circuits are used, then the circuit design is simple, but display quality deteriorates due to horizontal lines on LCD
Solution Approach 1:
The voltage regulator converts the potentially harmful voltage variations and leakage currents into beneficial effects by actively compensating for them. By regulating the control node voltage, it prevents the formation of unwanted multiple pulses that would cause horizontal lines on LCD, thus improving display quality while adding minimal circuit complexity
Solution Approach 2:
The invention changes the voltage parameter at the control node through the voltage regulator to prevent leakage-induced timing errors. This parameter optimization eliminates the harmful horizontal lines on LCD display while maintaining a relatively simple circuit design
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces current leakage and stabilizes voltage levels, preventing multi-pulse occurrences and improving display quality by eliminating undesirable horizontal lines on LCDs.
Implementation Method 1
The switch control unit is electrically coupled to the second terminal of the first switch and a ground terminal and configured to control a voltage at the second terminal of the first switch according to the first clock signal and to generate a periodical reverse bias between the control terminal of the first switch and the second terminal of the first switch
Data Source
AI summary
An Nth shift register unit includes an input circuit, a voltage regulator, and an output circuit. The input circuit is disposed to control a voltage at a control node of the Nth shift register unit according to a first scan signal of an (N−K)th shift register unit or a second scan signal of an (N+K)th shift register unit. The voltage regulator includes a first coupling element coupled to a first clock, a first switch disposed to receive the voltage at the control node and generate a reverse bias for reducing current leakage, and a switch control unit disposed to control the first switch according to the first clock. The output circuit is disposed to output a third scan signal.