Temperature-Aware Display Data Conversion for Color and Luminance
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Solution Overview
Problem
Display devices experience color shift and/or luminance shift due to ambient temperature changes, which vary with grayscale and luminance settings, leading to deteriorated image quality.
Innovation Solution
A display device with a data converter that calculates a compensation grayscale using reference compensation values based on input temperature, grayscale, and luminance to adjust input image data, reducing or preventing color and luminance shifts through a compensation offset and gain calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image data is displayed directly without compensation, then the display device operates with simple processing, but color shift and luminance shift occur due to ambient temperature changes
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in lookup tables during the manufacturing process. These compensation values are prepared in advance for various temperature conditions and grayscale levels, allowing the display device to simply retrieve and apply the appropriate compensation during operation without performing complex real-time calculations, thus maintaining image quality stability while keeping processing simple.
Solution Approach 2:
The patent introduces an intermediary compensation mechanism between the input image data and the display output. A compensation value is calculated based on temperature and grayscale information, then applied as an offset to the original image data before display. This intermediary compensation layer corrects temperature-induced color and luminance shifts without requiring complete redesign of the display processing pipeline.
2Speed
If compensation values are pre-stored in lookup tables, then compensation speed is improved, but memory usage and table size increase
Solution Approach 1:
The patent segments the compensation data structure into separate lookup tables for different parameters (temperature compensation values and grayscale-specific compensation values). This segmentation allows the system to retrieve only the necessary compensation data for current operating conditions rather than storing and searching through a single large comprehensive table, improving retrieval speed while reducing overall memory requirements through selective storage.
Data Source
AI summary
A display device may include a display panel which includes pixels, a data driver which provides data voltages corresponding to output image data to the pixels, and a data converter which generates a compensation grayscale from reference compensation values for compensating at least one selected from a color shift and a luminance shift corresponding to a temperature based on an input temperature, an input grayscale included in input image data, and an input luminance, and converts the input image data into the output image data based on the compensation grayscale.