Voltage Generating Circuit With NTC Thermistor for Display Reliability
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Solution Overview
Problem
The existing voltage generating circuits for display apparatuses face challenges in maintaining driving reliability due to noise generation and initial driving defects caused by temperature increases and leakage currents, which affect the quality of the display.
Innovation Solution
A voltage generating circuit is designed with a first and second charge pumping part, incorporating resistors, diodes, and capacitors, where the second charge pumping part includes a negative temperature coefficient thermistor to adjust resistance values, ensuring a smaller resistance as temperature increases, thereby reducing power consumption and preventing initial driving defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the gate drive circuit operates for a long time, then the display apparatus can maintain continuous operation, but the temperature of the gate drive circuit increases causing high temperature noise and reducing driving reliability
Solution Approach 1:
The patent applies parameter changes by using a negative temperature coefficient (NTC) thermistor that automatically adjusts resistance based on temperature. As temperature increases during continuous operation, the thermistor's resistance decreases, which compensates for temperature-induced variations in the gate drive circuit and maintains stable operation, thereby preventing high temperature noise and preserving driving reliability over extended periods
2Loss of energy
If the voltage difference between first voltage and second voltage is reduced, then power consumption is decreased, but initial driving defects may occur due to leakage current when bootstrap is not completed
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the resistance of the NTC thermistor based on temperature conditions. During initial driving when temperature is low, the thermistor maintains higher resistance to ensure sufficient voltage difference for reliable bootstrap completion and prevent leakage current issues. As temperature rises during normal operation, the resistance decreases to reduce the voltage difference and minimize power consumption, thus achieving both low power consumption and reliable initial driving
3Loss of energy
If the resistance value is decreased to reduce power consumption, then energy efficiency is improved, but the circuit becomes more sensitive to temperature variations and noise
Solution Approach 1:
The patent converts the harmful effect of temperature increase into a beneficial automatic adjustment mechanism. The NTC thermistor's negative temperature coefficient means that as temperature rises (which would normally increase noise and reduce reliability), the resistance automatically decreases, which in turn reduces the voltage difference and power consumption. This self-regulating behavior transforms temperature-induced problems into a compensating effect that maintains circuit stability while reducing energy consumption
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 enhances the driving reliability of the display apparatus by maintaining a small voltage difference between the first and second voltages applied to the gate drive circuit, reducing power consumption and preventing initial driving defects, while securing a high temperature margin over time.
Implementation Method 1
the second charge pumping part includes a negative temperature coefficient thermistor to adjust resistance values, ensuring a smaller resistance as temperature increases
Data Source
AI summary
A voltage generating circuit includes a first charge pumping part and a second charge pumping part. The first charge pumping part pumps a switching voltage, in response to a reference voltage, to output a first voltage. The second charge pumping part pumps the switching voltage, in response to the first voltage, to output a second voltage that is lower than the first voltage that is varied in accordance with time.