Data Compensator for Display Luminance Stability
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Solution Overview
Problem
Display devices with light emitting elements driven by current experience significant changes in luminance due to temperature variations, leading to inconsistent image quality.
Innovation Solution
A data compensator that calculates a target current using current deviations, contribution ratios, and efficiency factors for each pixel block, color, and grayscale, generating a scale factor to adjust image data and compensate for temperature-induced luminance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are driven by current, then luminance can be controlled proportionally to current, but luminance changes significantly with temperature variations
Solution Approach 1:
The patent implements a feedback mechanism by sensing the actual current flowing through the light emitting elements and comparing it with the target current. Based on this comparison, a scale factor is generated to adjust the grayscale values of image data, thereby compensating for temperature-induced luminance variations and maintaining stable display performance.
Solution Approach 2:
The patent changes the parameter of image data (grayscale values) based on temperature conditions. By calculating a scale factor that reflects temperature effects and applying it to scale the grayscale values, the system adapts the input parameters to compensate for temperature variations, ensuring consistent luminance output.
2Reliability
If temperature compensation is implemented through current sensing and image data scaling, then luminance stability improves, but device complexity increases
Solution Approach 1:
The patent introduces a data compensator as an intermediary component between the image data source and the display driver. This compensator performs current sensing, scale factor calculation, and image data scaling operations, centralizing the temperature compensation functionality in a dedicated module that manages the complexity rather than distributing it throughout the entire system.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a current sensor that senses a sensing current that flows through the pixels, and a data compensator. The data compensator calculates a target current from an image frame of input image data using a current deviation for each position of the image frame and a current contribution ratio for each color of the image frame, and that generates a scale factor by comparing the target current and the sensing current. The display device further includes a timing controller that generates output image data by scaling grayscale values of the input image data using the scale factor; and a data driver that provides a data signal corresponding to the output image data to the pixels.