Linear Low Temperature Compensating Circuit for LCD Gate High Voltage
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Solution Overview
Problem
Existing liquid crystal display (LCD) devices face issues with increased power consumption and fabrication costs due to the restriction of gate high voltage to specific levels, leading to inefficient charging of pixels at lower temperatures and poor display quality, especially when ambient temperatures fluctuate rapidly.
Innovation Solution
A power supplying unit with a linear low temperature compensating circuit that generates a gate high voltage linearly varying with ambient temperature, integrated within a power IC, allowing for efficient voltage compensation and rapid stabilization using a feedback mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gate high voltage is restricted to specific levels (2VDD or 3VDD) as in conventional charge pumping circuits, then the circuit structure is simple, but power consumption increases and display quality deteriorates due to inefficient pixel charging at lower temperatures
Solution Approach 1:
The patent applies dynamics by transitioning from fixed voltage levels (2VDD or 3VDD) to a dynamically adjustable gate high voltage that varies continuously based on temperature. The charge pumping circuit now generates VGH that can be precisely controlled according to ambient temperature conditions, allowing optimal voltage supply that reduces power consumption while maintaining display quality across different temperature ranges.
Solution Approach 2:
The patent implements parameter changes by modifying the gate high voltage parameter from discrete fixed values to continuous variable values based on temperature. The compensation voltage generated by the low temperature compensating circuit adjusts the VGH parameter dynamically, enabling precise control of pixel charging efficiency and reducing unnecessary power consumption at various temperature conditions.
2Ease of manufacture
If the gate high voltage is restricted to specific levels, then fabrication cost is reduced, but display quality deteriorates due to poor pixel charging efficiency at lower temperatures
Solution Approach 1:
The patent applies dynamics by implementing a temperature-dependent voltage adjustment mechanism that continuously adapts the gate high voltage to optimal levels. This dynamic adjustment ensures precise pixel charging across different temperature conditions, thereby maintaining high display quality without requiring complex fabrication processes, as the adjustment is achieved through circuit operation rather than manufacturing complexity.
Solution Approach 2:
The patent implements parameter changes by varying the gate high voltage parameter according to temperature measurements. The low temperature compensating circuit generates a compensation voltage that modifies the VGH parameter in real-time, ensuring optimal charging efficiency and display quality across different thermal conditions without increasing fabrication complexity.
3Device complexity
If conventional charge pumping circuits are used with fixed voltage levels, then the circuit design is simple, but response to rapid temperature changes is slow causing display quality deterioration
Solution Approach 1:
The patent applies feedback by implementing a temperature sensing and compensation mechanism where the low temperature compensating circuit continuously monitors ambient temperature and adjusts the gate high voltage accordingly. This feedback loop enables rapid response to temperature changes, allowing the circuit to quickly stabilize the optimal VGH level and maintain display quality during rapid thermal transitions, while keeping the overall circuit design relatively simple.
4Reliability
If the gate high voltage is increased to compensate for low temperature effects, then pixel charging efficiency improves, but power consumption increases due to unnecessary voltage supply
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting the gate high voltage parameter based on actual temperature conditions. The low temperature compensating circuit generates a compensation voltage that modifies VGH only when and to the extent needed for optimal pixel charging, avoiding unnecessary voltage elevation and thereby reducing power consumption while maintaining reliable display performance across different temperatures.
Data Source
AI summary
A power supplying unit for a liquid crystal display device includes: a power integrated circuit for generating a source voltage and a compensation voltage, the compensation voltage linearly varying according to an ambient temperature; and a charge pumping part for generating a gate high voltage using the source voltage and the compensation voltage, the gate high voltage linearly varying when the ambient temperature is lower than a reference temperature.