Image Data Corrector for Luminance Consistency in Overlapped Pixel Areas
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices face challenges in maintaining consistent luminance across different pixel areas, particularly when a camera or sensor overlaps with the pixel area, leading to variations in resolution and luminance.
Innovation Solution
The implementation of an image data corrector that adjusts the limit grayscale of image data for low-resolution pixel areas based on a dimming level, using a limit grayscale controller, grayscale booster, and grayscale mapper to ensure consistent luminance and prevent excessive stress on driving transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the camera or sensor overlaps with the pixel area to minimize the bezel, then the bezel size is reduced, but the luminance consistency across pixel areas deteriorates
Solution Approach 1:
The patent applies local quality by dividing the pixel area into first pixel areas (overlapped by camera/sensor) and second pixel areas (non-overlapped), and applying different image data correction strategies to each region. The image data corrector selectively adjusts limit grayscale and performs gamma correction only on the first pixel areas, while the second pixel areas maintain standard processing. This localized differentiation resolves the luminance consistency issue without requiring uniform changes across the entire display.
2Use of energy by moving object
If the resolution of the overlapping area is designed to be less than other display areas, then the camera transmittance is improved, but the luminance uniformity across the display deteriorates
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the limit grayscale parameter for image data corresponding to the first pixel areas based on the dimming level. The image data corrector modifies the grayscale range and applies gamma correction specifically to overlapping regions, changing the luminance parameters to compensate for the resolution difference. This allows the overlapping area to maintain lower resolution for better camera transmittance while achieving luminance uniformity through parameter adjustment.
3Device complexity
If the limit grayscale is not adjusted for low-resolution pixel areas, then the image data processing is simplified, but the gamma characteristics become distorted and driving transistors experience excessive stress
Solution Approach 1:
The patent implements preliminary action by pre-adjusting the limit grayscale and applying gamma correction to image data for the first pixel areas before the data is supplied to the pixel unit. The image data corrector performs these corrections in advance based on the dimming level, ensuring that the driving transistors receive appropriately scaled data that prevents excessive stress and maintains gamma characteristics. This preliminary processing avoids the need for complex real-time adjustments during display operation.
4Productivity
If the grayscale range is not limited for overlapping pixel areas, then the image data processing is faster, but the driving transistors suffer from excessive stress and unstable operation
Solution Approach 1:
The patent applies partial action by selectively limiting the grayscale range only for image data corresponding to the first pixel areas (overlapped regions), while leaving the grayscale range unrestricted for the second pixel areas. The image data corrector identifies which regions require limitation and applies the grayscale cap only where necessary, based on the dimming level. This partial application maintains processing efficiency for non-overlapped areas while ensuring transistor stability in overlapped regions.
Data Source
AI summary
A display device including: a pixel unit including first pixels disposed in a first pixel area and second pixels disposed in a second pixel area; an image data corrector adjusting a limit grayscale of first image data corresponding to the first pixel area based on a dimming level defining a maximum luminance at which the pixel unit is able to emit light, and correcting the first image data based on the limit grayscale; a data driver supplying data signals to the pixel unit based on the corrected first image data and second image data corresponding to the second pixel area; and a scan driver supplying scan signals to the pixel unit.