Display Panel Pixel Calibration for Luminance Uniformity
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Solution Overview
Problem
Display apparatuses experience artifacts and non-uniform luminance after calibration due to differences in Red/Green/Blue coefficient values between pixels, causing optical illusions and visual distortions.
Innovation Solution
A display apparatus and method that recalibrate pixel coefficients by comparing luminance between pixels, modifying initial calibration values based on differences, and generating a gate control signal to control the display panel, ensuring uniformity and improved chromaticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If calibration is performed to reduce luminance and chromaticity differences between pixels, then uniformity of light emitting diodes is improved, but artifact holes are generated due to differences in Red/Green/Blue coefficient values between calibrated pixels and surrounding pixels
Solution Approach 1:
The patent applies parameter changes by modifying the calibration coefficient values of pixels based on their surrounding environment. Specifically, it adjusts the Red/Green/Blue coefficient values of each pixel by comparing it with its neighboring pixels and applying compensation values to reduce the visual artifacts caused by calibration. This dynamic adjustment of parameters resolves the contradiction by maintaining LED uniformity while eliminating artifact holes through localized coefficient modification.
Solution Approach 2:
The patent implements local quality by applying different calibration adjustments to different pixels based on their local surroundings. Each pixel's calibration coefficient is modified independently according to the luminance and chromaticity differences between that pixel and its neighbors. This localized approach allows the system to maintain overall uniformity while addressing specific artifact problems in particular regions without affecting the entire display uniformly.
2Device complexity
If initial calibration coefficient values are applied to all pixels, then calibration process is simplified, but luminance uniformity among pixels deteriorates due to inherent differences in pixel characteristics
Solution Approach 1:
The patent uses parameter changes by dynamically adjusting calibration coefficients based on measured luminance and chromaticity values. Instead of applying a single initial calibration value to all pixels, the system measures each pixel's actual output and modifies its calibration coefficient accordingly. This approach increases manufacturing precision for luminance uniformity while keeping the calibration process manageable through automated measurement and calculation.
Solution Approach 2:
The patent implements feedback by measuring the actual luminance and chromaticity output of each pixel after initial calibration, then using these measurements to calculate and apply compensation values. The system creates a closed-loop calibration process where the output of each pixel is measured and fed back to adjust its calibration coefficient, ensuring luminance uniformity across the display while maintaining a systematic calibration approach.
Data Source
AI summary
The present invention provides a display apparatus that improves the uniformity of luminance among a plurality of pixels and improves chromaticity by recalibrating artifacts of a display image recognized by a visual sensation even after calibration is performed, and a method of controlling the same. The display apparatus may include a display panel; a communication circuitry configured to receive an initial calibration coefficient value of a first pixel and at least one second pixel except for the first pixel of the display panel; and a controller configured to compare luminance of the first pixel and the second pixel based on the initial calibration coefficient value, to modify the initial calibration coefficient value based on the comparison result, and to control the display panel based on the modified calibration coefficient value.