Display Scale Factor Circuit for Temperature-Compensated Current Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in supplying appropriate current to pixels due to variations in ambient temperature, leading to unintended changes in luminance and potential image quality deterioration.
Innovation Solution
A display device with a scale factor generating circuit that adjusts the current supply based on temperature and global current values, using a reference range to determine a scale factor for scaling grayscale values of image data, and a power controller to manage power source voltages, ensuring appropriate current delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display device operates without temperature-based current adjustment, then the device structure remains simple, but the current supply becomes inconsistent across varying temperatures causing luminance discrepancies
Solution Approach 1:
The scale factor generating circuit pre-calculates and stores scale factors corresponding to different temperature ranges before actual operation. When the temperature sensor detects the current temperature, the system directly retrieves the appropriate scale factor from the pre-established reference range, avoiding real-time complex calculations and enabling rapid current adjustment response
Solution Approach 2:
The scale factor acts as an intermediary parameter between the temperature sensor output and the current control mechanism. Instead of directly controlling current based on temperature, the system uses the scale factor as a mediating variable that translates temperature conditions into appropriate current adjustments, simplifying the control logic while maintaining precision
2Illumination intensity
If the display device uses fixed current supply, then the power consumption is stable and predictable, but the luminance becomes inconsistent under different ambient temperatures
Solution Approach 1:
The system dynamically adjusts the current supply to pixels based on real-time temperature monitoring. The scale factor generating circuit modifies the grayscale values dynamically according to the detected temperature, ensuring that luminance remains consistent across varying thermal conditions while allowing power consumption to adapt naturally to operational requirements
3Adaptability or versatility
If the scale factor reference range is made wide to cover all temperature conditions, then the system becomes more adaptable to temperature variations, but the precision of current control decreases
Solution Approach 1:
The temperature operating range is segmented into multiple discrete temperature ranges, with each range having its own dedicated scale factor. The scale factor generating circuit divides the broad temperature spectrum into smaller intervals, assigning a specific scale factor to each interval. This segmentation approach enables precise current control within each temperature band while collectively covering the entire operational temperature range
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a timing controller, a data driver and a scale factor. The timing controller calculates a frame load value corresponding to an image frame of input image data and generates image data by scaling grayscale values of the input image data using a scale factor. The data driver generates a data signal corresponding to the image data and supplies the data signal to the pixels. The scale factor generating circuit sets a reference range based on a temperature of the display panel and a global current value that flows through the pixels, and generates the scale factor included within the reference range based on the frame load value and the global current value.