LCD Image Signal Modification Using Temperature-Dependent Quadratic Coefficients
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in displaying desired image data due to insufficient response time of liquid crystal material, especially under varying temperatures, leading to display inconsistencies at the same gray levels.
Innovation Solution
A liquid crystal display device and method that incorporates a temperature sensor, image signal modifying portion using quadratic equation coefficients, and data driving portion to calculate and generate modified image signals, minimizing errors caused by temperature non-linearity, thereby improving response time and display accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the DCC method is used to raise response time by generating modified signals based on comparison between previous and current frame image signals, then the response time of liquid crystal material is improved, but the display shows different images at the same gray level due to temperature variation
Solution Approach 1:
The patent applies parameter changes by introducing temperature as a variable parameter and using quadratic equation coefficients that change with temperature. The image signal modification process is adjusted based on detected temperature values, allowing the system to compensate for temperature-induced non-linearity in liquid crystal response characteristics
Solution Approach 2:
The patent implements feedback by using a temperature sensor to detect the actual temperature of the liquid crystal display device and feeding this information back to the image signal modifying portion. This closed-loop feedback mechanism enables real-time adjustment of the modification process to maintain display accuracy across varying temperature conditions
2Speed
If image signals are modified to improve response time, then liquid crystal material response is accelerated, but modification errors increase under varying temperature conditions
Solution Approach 1:
The patent changes the parameters used in signal modification by applying temperature-dependent quadratic equation coefficients. Instead of using fixed modification parameters, the system dynamically adjusts the modification process based on temperature, thereby maintaining signal accuracy while achieving fast response
Solution Approach 2:
The patent introduces dynamics into the previously static signal modification process by making the modification parameters adaptive to temperature changes. The system continuously adjusts the modification process in response to temperature variations, transforming a rigid fixed-parameter approach into a flexible dynamic system
Data Source
AI summary
A liquid crystal display (LCD) device comprises a liquid crystal panel assembly having pixels and thin film transistors, a sensor sensing temperature, a image signal modifying portion receiving image signals and the temperature, calculating a plurality of reference data for modification with respect to the temperature using coefficient of quadratic equation, and generating modified images signals according to the reference data for modification for the image signals for previous and current frame; and a data driving portion converting the modified image signals into data voltages and supplying the data voltages to the liquid crystal panel assembly. According to this configuration, the liquid crystal display device may reduce the size of the memory by calculating modified image signals with respect to the temperature using PQI.