LCD Driving Voltage Adjustment for Temperature Stability
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining picture quality due to variations in environmental temperature, which affect the driving voltage levels and result in poor contrast ratios and inaccurate gradations.
Innovation Solution
A device and method for driving liquid crystal display devices that include a power source unit transforming external power into a rated voltage level and a driving voltage generating unit adjusting this voltage based on environmental temperature to produce stable positive polarity driving voltages, which are then used to generate necessary voltages for the panel and drivers, ensuring consistent voltage levels across temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the liquid crystal display device is used in varying environmental temperatures, then the device can operate in diverse conditions, but the driving voltage level varies causing poor picture quality and inaccurate gradations
Solution Approach 1:
The patent applies parameter changes by detecting environmental temperature and dynamically adjusting the driving voltage level accordingly. The controller modifies the voltage parameter to compensate for temperature-induced variations in liquid crystal permittivity and panel resistance, thereby maintaining accurate gradations and picture quality across different temperature conditions.
Solution Approach 2:
The patent implements feedback by using a temperature sensor to continuously monitor environmental temperature and feeding this information back to the controller. The controller then adjusts the driving voltage based on the detected temperature, creating a closed-loop system that maintains optimal display performance despite temperature variations.
2Device complexity
If the driving voltage level is kept constant, then the circuit design is simplified, but the liquid crystal permittivity and resistance variations with temperature cause changing driving ranges and voltage levels
Solution Approach 1:
The patent dynamically changes the driving voltage parameter based on detected environmental temperature. The controller adjusts the voltage level to compensate for temperature-induced changes in liquid crystal permittivity and panel resistance, maintaining stable driving conditions without requiring overly complex 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
This solution maintains consistent driving voltage levels across varying environmental temperatures, preventing a decline in picture quality and ensuring stable contrast ratios and gradations.
Implementation Method 1
a feedback voltage adjusting unit for generating the feedback voltage having a level transformed in conformity with variation of the environmental temperature
Implementation Method 2
the liquid crystal display device controls a ratio of light transmission through liquid crystals by using an electric field
Data Source
AI summary
Device and method for driving a liquid crystal display device where a driving voltage level is varied with the temperature of an operating environment of the liquid crystal display device to improve display quality. The device includes a liquid crystal display panel, gate and data drivers for driving gate and data lines of the liquid crystal display panel, a timing controller for controlling the data and gate drivers, a power source unit for transforming an external power into a rated voltage level required for driving the liquid crystal display device and forwarding the power, and a driving voltage generating unit for adjusting a voltage level of the power transformed thus in conformity with an environmental temperature to generate a positive polarity driving voltage and using the driving, voltage for generating a plurality of driving voltages required for driving units, including the liquid crystal panel, the gate driver and data driver.