Temperature-Compensated Display Device for Stable Pixel Luminance
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Solution Overview
Problem
Display devices face challenges in maintaining target luminance due to changes in ambient temperature affecting current flow and efficiency of pixels, leading to inconsistent image quality.
Innovation Solution
A display device with a timing controller, data driver, and logic circuits that adjust target current values based on ambient temperature, using current sensors and weight data to compensate for changes in pixel characteristics, ensuring consistent luminance across varying temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If target current is supplied to pixels without temperature compensation, then power consumption is reduced and device complexity is minimized, but luminance consistency deteriorates as ambient temperature changes
Solution Approach 1:
The system pre-calculates and stores compensation values in lookup tables before actual operation. The timing controller pre-processes image data to calculate compensation values based on expected temperature conditions, storing these in advance so that during display operation, only simple table lookup and application is needed, rather than performing complex real-time calculations
Solution Approach 2:
The patent introduces an intermediary compensation mechanism between the input image data and the pixel output. The timing controller acts as an intermediary that processes the image data through multiple calculations (frame load value, block load values, compensation values) before delivering the final compensated data to the pixels, thereby mediating the temperature effect
2Illumination intensity
If real-time temperature measurement and compensation calculations are performed, then luminance stability is improved, but processing time and computational load increase
Solution Approach 1:
The system performs compensation calculations in advance and stores results in lookup tables. The timing controller pre-calculates compensation values based on frame load values and block load values before the actual display refresh, so that during the critical display timing, only simple table lookup and value application is required, significantly reducing real-time processing time
Solution Approach 2:
The system dynamically adjusts the compensation level based on actual operating conditions. The timing controller calculates frame load values and block load values to determine the actual compensation needed for each frame, allowing the compensation mechanism to adapt its intensity to the specific image content and temperature conditions rather than applying fixed compensation
3Illumination intensity
If simple current scaling is used without detailed block analysis, then device complexity is reduced, but luminance uniformity across different blocks deteriorates
Solution Approach 1:
The display panel is divided into multiple blocks, and the timing controller calculates separate block load values for each block based on the image data. This segmentation allows different compensation values to be applied to different blocks, addressing local luminance variations caused by temperature gradients across the display panel
Solution Approach 2:
The system applies different compensation values to different blocks based on their specific load characteristics. The timing controller calculates individual block load values and generates specific compensation values for each block, allowing each block to receive tailored compensation rather than a uniform approach, thereby achieving local luminance uniformity
Data Source
AI summary
A display device includes a display panel including a plurality of pixels and partitioned into a plurality of blocks including at least one of the pixels, a timing controller configured to receive input image data from an outside source and generate scaled image data by scaling the input image data using a scale factor, a data driver configured to generate a data signal corresponding to the scaled image data and supply the data signal to the pixels, and a logic circuit configured to generate the scale factor based on the input image data, first weight data, and second weight data different from the first weight data.