Image Display Device Pixel Degradation Prevention
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Solution Overview
Problem
Conventional image display devices suffer from pixel degradation and afterimage formation when displaying still images for extended periods, particularly logos with constant R, G, and B gray scale values, leading to user recognition and inconvenience.
Innovation Solution
An image display device with a pixel detection unit, gray scale value calculation unit, and data correction unit that detects pixels with constant gray scale values, calculates average gray scale values of adjacent pixels, generates a scaling variable, and corrects the R, G, and B values of the first pixels to prevent afterimage formation by adjusting their luminance relative to the surrounding pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If pixels display constant R, G, and B gray scale values for extended periods, then image display stability is maintained, but pixel degradation and afterimage formation occur
Solution Approach 1:
The patent applies periodic action by detecting pixels that maintain constant gray scale values for a predetermined time period and periodically correcting their luminance values. The correction is performed by adjusting the luminance of detected pixels based on the average luminance of adjacent pixels, creating a periodic refresh mechanism that prevents pixel degradation while maintaining overall image stability.
Solution Approach 2:
The patent changes the luminance parameter of specific pixels dynamically. By calculating the average luminance of adjacent pixels and using it to adjust the luminance of detected pixels, the system modifies pixel parameters in response to display conditions, preventing afterimage formation while maintaining image quality.
2Reliability
If luminance correction is applied to prevent afterimage, then pixel degradation is reduced, but user recognition of luminance changes may increase
Solution Approach 1:
The patent applies local quality by performing luminance correction only on specific pixels that are detected to have constant gray scale values for a predetermined time, rather than uniformly correcting all pixels. This localized approach adjusts only the necessary pixels based on their adjacent pixels' average luminance, minimizing user-perceptible changes while effectively preventing afterimage formation.
3Reliability
If pixel detection and correction processing is performed, then afterimage formation is prevented, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by detecting pixels with constant gray scale values before afterimage formation occurs and proactively correcting their luminance. The system monitors pixel states continuously and performs correction in advance, preventing the harmful effect rather than remedying it after occurrence, which simplifies the overall processing required.
Solution Approach 2:
The patent implements self-service by using the average luminance information of adjacent pixels to automatically correct the luminance of detected pixels. The system utilizes existing display data and spatial relationships to perform corrections without requiring external intervention or complex processing algorithms, reducing device complexity while maintaining effective afterimage prevention.
Data Source
AI summary
An image display device includes a plurality of pixels, a pixel detection unit configured to detect first pixels having same R, G, and B gray scale values for a predetermined time among the plurality of pixels, a gray scale value calculation unit configured to calculate average gray scale values of the first pixels and average gray scale values of corresponding R, G and B of second pixels in a predetermined area around the first pixels, a data correction unit configured to correct the R, G and B gray scale values of the first pixels, using the calculated average gray scale values of the first and second pixels, and a data driver configured to correct the image data with the corrected R, G and B gray scale values of the first pixels, and to supply the corrected image data to each pixel of the plurality of pixels.