Shift Register Unit With Variable Resistor for RC Delay Compensation
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Solution Overview
Problem
In TFT-LCD panels, the production cost is high due to expensive masks, and local dimming backlight systems cause uneven illumination, leading to differences in RC Delay and charging rates across the panel, resulting in display defects like horizontal stripes.
Innovation Solution
A shift register unit with a variable resistor, such as a photoresistor or thermistor, adjusts the scanning signal levels based on light intensity, ensuring consistent charging rates across the panel by changing resistance values in response to illumination conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a variable resistor (photoresistor or thermistor) is introduced into the shift register unit to adjust scanning signal levels based on light intensity, then horizontal stripes caused by RC Delay differences are reduced or eliminated, but the device complexity increases
Solution Approach 1:
The patent introduces a variable resistor (photoresistor or thermistor) that changes its resistance value in response to light intensity or temperature variations. This parameter change allows the scanning signal level to be dynamically adjusted, compensating for RC Delay differences and maintaining consistent charging rates across the panel under different illumination conditions.
Solution Approach 2:
The variable resistor automatically responds to environmental changes (light intensity or temperature) without requiring external control signals. The photoresistor changes resistance based on incident light, and the thermistor changes resistance based on temperature, enabling the circuit to self-adjust and compensate for RC Delay variations autonomously.
2Ease of manufacture
If GOA technology is used to drive gate lines directly on thin film transistor array substrate, then production cost is reduced and bezel is narrowed, but manufacturing precision requirements increase due to direct fabrication
Solution Approach 1:
The patent compensates for potential fabrication variations by using a variable resistor that dynamically adjusts the scanning signal level based on environmental conditions. This parameter change mechanism helps maintain consistent charging rates and display quality even when manufacturing precision varies within acceptable ranges.
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
This solution reduces or eliminates horizontal stripes caused by RC Delay differences, maintaining consistent charging effects across the panel regardless of light intensity variations, thereby improving display quality and reducing production costs.
Implementation Method 1
the variable resistor comprises a photoresistor, the photoresistor comprises a photoelectric sensitive material, and a resistance value of the photoelectric sensitive material is in a negative correlation with light intensity that is received
Implementation Method 2
the variable resistor comprises a thermistor having a negative temperature coefficient
Data Source
AI summary
A shift register unit, a method of driving a shift register unit, a gate driving circuit, and a display device are disclosed. The shift register unit includes an input circuit and an output circuit. The input circuit is configured to write an input signal of the input terminal to the first node in response to an input control signal, so as to control a level of the first node. The output circuit is configured to receive a clock signal of the clock signal terminal and output a scanning signal through the pixel signal output terminal under control of the level of the first node. The output circuit includes a variable resistor, and the variable resistor is configured to adjust a level of the scanning signal according to a resistance value of the variable resistor.