Display Luminance Compensation via Measured Grayscale Data
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Solution Overview
Problem
Display devices often exhibit non-uniform luminance due to characteristic deviations among pixels, leading to images with visible spots and uneven brightness.
Innovation Solution
A display device with an image compensation system that calculates compensation grayscale data using captured and measured luminance data, allowing for accurate adjustment of input grayscale data to achieve uniform luminance across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixels are manufactured without compensation, then manufacturing process is simple, but luminance uniformity deteriorates due to characteristic deviations among pixels
Solution Approach 1:
The patent applies preliminary action by measuring luminance characteristics of pixels during the manufacturing process and pre-calculating compensation grayscale data before the display device is put into use. This allows luminance uniformity to be corrected in advance, eliminating the need for complex real-time compensation systems during operation.
Solution Approach 2:
The patent implements feedback by measuring the actual luminance output of each pixel and using this measurement data to calculate compensation values. The measured luminance data is fed back into the compensation algorithm to determine the appropriate compensation grayscale data that will correct the characteristic deviations.
2Manufacturing precision
If compensation grayscale data is calculated for all grayscales, then luminance uniformity is improved, but calculation time and processing complexity increase
Solution Approach 1:
The patent applies partial action by selecting only specific representative grayscales (such as minimum, middle, and maximum grayscales) for measurement and compensation data calculation, rather than measuring all possible grayscale values. This reduces the calculation time and processing complexity while still achieving effective luminance uniformity across the full grayscale range through interpolation.
3Illumination intensity
If measured grayscale is smaller than minimum captured grayscale, then low luminance compensation is improved, but measurement precision requirements increase
Solution Approach 1:
The patent applies preliminary anti-action by proactively measuring and compensating for luminance characteristics at low grayscale levels during the manufacturing process. By capturing luminance data at measured grayscales that extend below the minimum captured grayscale, the system preemptively corrects potential low luminance issues before they affect actual display performance.
Data Source
AI summary
A display device may include a display panel including a plurality of pixels, a data compensator configured to calculate compensation grayscale data for a measuring grayscale based on capturing luminance data including luminances of the pixels corresponding to one of capturing grayscales included in a plurality of grayscales, measuring luminance data including luminances of a plurality of areas of the display panel corresponding to the measuring grayscale other than the capturing grayscales among the grayscales, and input grayscale data for the measuring grayscale, a timing controller configured to generate output grayscale data based on the input grayscale data and the compensation grayscale data, and a data driver configured to generate a data voltage based on the output grayscale data, and provide the data voltage to the display panel.