Display Device Luminance Correction for Logo Background Recognition
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Solution Overview
Problem
Display devices face image quality degradation due to lowered grayscale of logo background images, which can make them unrecognizable to users, especially when the grayscale is excessively reduced.
Innovation Solution
A display device with a luminance correction block that divides the correction area into sub-areas based on distance from the logo image, generating area correction signals to adjust luminance, and uses a correction grayscale signal to normalize and correct the luminance of the logo background image, preventing excessive luminance reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the luminance of the logo background image is reduced, then the logo image becomes more prominent, but the logo background image becomes unrecognizable
Solution Approach 1:
The patent applies local quality by dividing the correction area into multiple sub-areas based on distance from the logo image, and applying different luminance correction levels to each sub-area. The first sub-area (closest to logo) receives stronger luminance reduction to make the logo prominent, while the third sub-area (farthest from logo) receives weaker or no luminance reduction to maintain background recognizability. This spatially differentiated approach resolves the contradiction by making the luminance adjustment localized rather than uniform.
2Illumination intensity
If the grayscale of the logo background image is excessively reduced, then the logo stands out more, but the background image quality degrades
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the luminance correction amount based on the grayscale value of the image signal. The correction grayscale generation block generates a correction grayscale signal by multiplying the original grayscale by a correction constant n (≥1), and the luminance correction block applies different correction levels based on whether the grayscale exceeds a reference value. This parameter-based adaptive correction prevents excessive grayscale reduction that would degrade image quality while still achieving logo prominence.
3Illumination intensity
If uniform luminance correction is applied to the entire correction area, then the logo becomes prominent, but the logo background image loses detail
Solution Approach 1:
The patent applies segmentation by dividing the correction area into multiple sub-areas (first, second, and third sub-areas) based on distance from the logo image. Each sub-area receives a different luminance correction level through separate correction paths. This segmentation allows the logo area to be prominently displayed while preserving background details in regions farther from the logo, thus resolving the contradiction between logo prominence and background detail preservation.
Data Source
AI summary
A display device includes a display panel including a correction area in which a correction image including a logo image and a logo background image is displayed, and a panel driving block. The panel driving block includes a luminance correction block which corrects a luminance of the correction image, and the luminance correction block includes a first correction block which divides the correction area into a plurality of sub-areas, based on a distance from the logo image and generates an area correction signal for correcting the luminance of the correction image, a second correction block which generates a luminance correction signal for correcting the luminance of the correction image displayed in each of the sub-areas, based on a grayscale of the image signal and the area correction signal, and a third correction block which corrects the luminance of the correction image.