Temperature-Compensated LCD Gray Data LUT Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from motion blur due to slow response speed, which is affected by temperature and vertical frequency variations, leading to increased memory capacity and chip size when using dynamic capacitance compensation (DCC) with look-up tables (LUTs) for different temperatures.
Innovation Solution
A display device and method that extracts compensation data from a gray compensation look-up table (LUT) based on ambient temperature, using a compensation proportion parameter to generate compensated gray data, reducing memory capacity by utilizing LUTs for temperature intervals and approximating temperatures when exact matches are not available.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple LUTs for different temperatures are stored in memory, then liquid crystal response speed is improved across varying temperatures, but chip size and memory capacity increase
Solution Approach 1:
The patent divides the temperature compensation data into multiple segments, each stored in a separate LUT corresponding to different temperature ranges. Instead of storing all temperature compensation data in a single large LUT, the compensation data is segmented by temperature intervals (e.g., 20°C, 30°C, 40°C LUTs), allowing the system to select and use only the relevant segment for the current temperature condition. This segmentation reduces the memory capacity required in each individual LUT while maintaining comprehensive temperature compensation coverage.
Solution Approach 2:
The patent implements a dynamic temperature compensation system that automatically selects the appropriate LUT based on the detected ambient temperature. The system dynamically switches between different LUTs (20°C LUT, 30°C LUT, 40°C LUT) depending on the current temperature conditions, rather than using a static single LUT approach. This dynamic selection mechanism ensures optimal liquid crystal response speed for the current temperature while minimizing memory usage by only loading and processing the necessary LUT data.
2Measurement precision
If multiple LUTs for different temperatures are stored in memory, then compensation accuracy is improved, but memory capacity increases
Solution Approach 1:
The patent applies local quality by creating specialized LUTs optimized for specific temperature ranges rather than using a single general-purpose LUT. Each LUT (20°C LUT, 30°C LUT, 40°C LUT) contains compensation data specifically tailored to its temperature range, providing higher compensation accuracy for that local temperature condition. This local optimization approach improves measurement precision within each temperature range while reducing the total memory capacity required compared to storing all possible compensation data in one large LUT.
Data Source
AI summary
A display device including a liquid crystal display unit and a controller displays an image using a liquid crystal. The controller extracts a compensation data from a gray compensation look-up table (LUT) corresponding to a temperature interval including a peripheral temperature of the display device to output the compensation data to the liquid crystal display unit as a compensated gray data. When the gray compensation LUT does not exist, the controller extracts the compensation data from the gray compensation LUT corresponding to the temperature interval approximating the peripheral temperature to generate the compensated gray data. The gray compensation LUT as a default and a calculated gray compensation LUT may be used to provide the compensated gray data optimized for the response speed of the liquid crystal according to variance in temperature, while reducing a memory capacity of a ROM and a RAM inside the timing controller and an external EEPROM.