Temperature Adaptive Overdrive for LCD Response Time
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in quickly responding to rapidly changing images due to slow response times, which vary with ambient temperature, leading to poor video quality and increased memory costs when using multiple lookup tables for temperature calibration.
Innovation Solution
A temperature adaptive algorithm adjusts overdrive parameters from a single reference lookup table based on measured ambient temperature, eliminating the need for multiple lookup tables and reducing memory costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple lookup tables calibrated at different temperature settings are used, then accurate liquid crystal response times in different temperature environments are achieved, but memory bandwidth and memory cost increase
Solution Approach 1:
The patent combines multiple temperature-specific lookup tables into a single unified lookup table that stores base overdrive parameters. A temperature compensation algorithm then dynamically adjusts these parameters based on the current temperature, eliminating the need for separate lookup tables for each temperature condition while maintaining response accuracy.
Solution Approach 2:
The patent changes the approach from storing multiple complete lookup tables to storing a single base table and dynamically adjusting parameters through temperature compensation. The overdrive parameters are modified in real-time based on temperature measurements, allowing accurate compensation without increasing memory storage requirements.
2Measurement precision
If overdrive parameters are adjusted for temperature variations, then liquid crystal response time accuracy is maintained, but device complexity increases
Solution Approach 1:
The patent performs preliminary calibration and stores base overdrive parameters in a single lookup table during manufacturing. The temperature compensation algorithm then applies pre-determined adjustment factors based on measured temperature, simplifying the runtime operation while maintaining accuracy across temperature variations.
3Quantity of substance
If a single lookup table is used without temperature compensation, then memory cost is reduced, but response time accuracy varies with temperature
Solution Approach 1:
The patent implements a feedback mechanism where the current temperature is continuously measured and used to dynamically adjust the overdrive parameters retrieved from the lookup table. This closed-loop approach ensures that the displayed image quality remains consistent across temperature variations while using a single compact lookup table.
Data Source
AI summary
A method and system for calculating an overdrive parameter for a liquid crystal within an LCD device to compensate for temperature variations. An example system includes a temperature sensor for measuring an ambient temperature near a liquid crystal and a memory for storing a lookup table containing a plurality of overdrive parameters. Each overdrive parameter corresponds to a graylevel transition between a previous frame and a current frame, and represents a level at which a liquid crystal is driven in order to achieve a desired response time for the graylevel transition at a reference temperature. A processor extracts the appropriate overdrive parameter from the lookup and calculates an adapted overdrive parameter that adjusts for the difference between the measured ambient temperature and the reference temperature.