Liquid Crystal Display Source Driver Temperature Adaptation
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Solution Overview
Problem
Conventional liquid crystal display devices face issues with vertical line defects at low ambient temperatures due to reduced rising slope of source voltage and increased power consumption at high temperatures, as the source amplifying set value is fixed and not adaptable to temperature changes, affecting the mobility of thin film transistors and charge efficiency.
Innovation Solution
A liquid crystal display device with a temperature sensor that adjusts the source amplifying register settings to control the rising slope of source voltages based on ambient temperature, using an analog-digital converter, comparator, and controller to generate appropriate source amplifying set values, ensuring consistent voltage output across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the source amplifying set value is fixed for room temperature operation, then the liquid crystal cells can sufficiently represent brightness at room temperature, but the rising slope of source voltage is reduced at low temperatures causing charge errors and vertical line defects
Solution Approach 1:
The source amplifying set value is changed from a fixed parameter to a dynamically adjustable one based on temperature. The system uses a temperature sensor to detect ambient temperature and automatically selects appropriate source amplifying set values (e.g., level 1-5) to maintain optimal rising slope across different temperature conditions, preventing charge errors and vertical line defects at low temperatures while maintaining brightness accuracy at room temperature
Solution Approach 2:
The patent changes the parameter of source amplifying set value based on temperature conditions. At room temperature, higher set values (level 3 or 4) are used for sufficient brightness representation, while at low temperatures, higher set values are selected to compensate for reduced TFT mobility and maintain adequate rising slope, thus adapting the electrical parameters to environmental conditions
2Productivity
If the source amplifying set value is increased to maintain rising slope at low temperatures, then charge efficiency improves, but power consumption increases at high temperatures
Solution Approach 1:
The system dynamically adjusts the source amplifying set value based on real-time temperature sensing. At low temperatures, higher set values are applied to maintain rising slope and ensure adequate charge efficiency. At high temperatures, lower set values are used to prevent excessive power consumption, as TFT mobility is already sufficiently high. This dynamic adaptation optimizes the balance between charge efficiency and power consumption across different operating conditions
Solution Approach 2:
The patent implements temperature-dependent parameter changes for the source amplifying set value. The system selects from multiple predefined set values (level 1-5) based on temperature ranges, ensuring that the parameter is optimized for each thermal condition rather than using a single fixed value, thereby achieving both adequate charge efficiency and controlled power consumption
3Device complexity
If the source amplifying register uses a fixed preset value, then the device structure remains simple, but the rising slope cannot be controlled based on ambient temperature changes
Solution Approach 1:
The source amplifying register is transformed from a static fixed-value register to a dynamic temperature-adaptive register. A temperature sensor is integrated to continuously monitor ambient temperature, and the register automatically selects from multiple preset source amplifying set values based on the detected temperature range, enabling the system to adapt to environmental changes without requiring complex real-time calculation circuits
Solution Approach 2:
The system implements self-service temperature compensation through automatic temperature sensing and corresponding adjustment of source amplifying set values. The temperature sensor and control logic work autonomously to select appropriate set values without requiring external intervention or complex processing, maintaining relatively simple device structure while achieving temperature adaptability
Data Source
AI summary
A liquid crystal display device includes a display unit including a plurality of liquid crystal cells at crossing regions of a plurality of data lines and a plurality of gate lines, a source driver for supplying source voltages to the plurality of data lines, and a temperature sensor for sensing an ambient temperature and for outputting an temperature sensing signal corresponding to the ambient temperature, wherein the source driver includes a source amplifying register unit for controlling a rising slope of the source voltages in accordance with the temperature sensing signal.