Display Device Current Control via Temperature-Adaptive Scale Factors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in supplying appropriate current to pixels due to process variations and changes in ambient temperature, leading to unsatisfactory image quality.
Innovation Solution
A display device comprising a pixel set, timing controller, data driver, and scale factor provider that calculates load values and generates scale factors based on temperature data and light emission efficiency values to adjust current supply, ensuring optimal current distribution across pixel groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed current is supplied to all pixels, then the device complexity is reduced, but the image quality deteriorates due to process variations and temperature changes
Solution Approach 1:
The pixel array is divided into multiple pixel groups (e.g., first pixel group, second pixel group) with different scale factors applied to each group. This segmentation allows independent current control for each group, compensating for process variations and temperature effects on a localized basis while maintaining manageable system complexity.
Solution Approach 2:
Different scale factors are applied to different pixel groups based on their specific characteristics and operating conditions. The timing controller calculates and applies customized scale factors to each pixel group, enabling local optimization of current supply to compensate for spatial variations in light emission efficiency and temperature effects.
2Measurement precision
If scale factors are calculated for each pixel group based on temperature and light emission efficiency, then the current control precision is improved, but the device complexity increases
Solution Approach 1:
The system dynamically adjusts scale factors based on changing parameters such as temperature and light emission efficiency. The timing controller calculates scale factors by considering these varying parameters, allowing precise current control that adapts to environmental changes and pixel characteristics without requiring hardware modifications.
Solution Approach 2:
The system uses feedback from temperature sensors and light emission efficiency measurements to calculate appropriate scale factors. The timing controller receives information about actual pixel group performance and adjusts scale factors accordingly, creating a closed-loop control system that improves precision while using software-based control rather than complex hardware.
3Reliability
If the luminous efficiency variations are compensated, then the image quality is improved, but the calculation complexity increases
Solution Approach 1:
Scale factors are pre-calculated and stored for different pixel groups based on their characteristics. The timing controller selects and applies the appropriate pre-calculated scale factor based on current operating conditions, avoiding the need for complex real-time calculations while still achieving compensation for luminous efficiency variations.
Data Source
AI summary
A display device may include a pixel set, a timing controller, a data driver, and a scale factor provider. The pixel set that may include pixels. The pixels may be divided into pixel groups. The timing controller may calculate first load values corresponding to an image frame of input image data and may generate image data by scaling gradation values of the input image data using scale factors. The data driver may generate data signals corresponding to the image data and may supply the data signals to the pixel set. The scale factor provider may calculate the first load values and one or more second load values based on temperature data corresponding to a temperature of the pixel set and may generate the scale factors based on the one or more second load values and a common current value of a current received by the pixels.