Display Device Boundary Subpixel Luminance Adjustment
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Solution Overview
Problem
Display devices face challenges in minimizing bezel size while maintaining image quality, particularly when a camera or sensor overlaps the pixel area, leading to differences in pixel structure and luminance between areas, which can result in visible color bands at boundaries.
Innovation Solution
A display device with a data processor that adjusts image data for boundary subpixels based on their positional relationship, using a lookup table to determine luminance ratios and grayscale gains, thereby reducing luminance and preventing color band visibility by dimming specific subpixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixels with different arrangement structures are used in different areas to improve transmittivity where the camera is disposed, then the bezel size is minimized and camera integration is improved, but visible color bands appear at the boundaries between different pixel areas
Solution Approach 1:
The patent applies different pixel arrangement structures (first arrangement structure in first pixel area, second arrangement structure in second pixel area) to different local regions of the display. This allows the camera area to have optimized transmittivity while other areas maintain their original structure, resolving the contradiction between local transmittivity improvement and overall display uniformity.
Solution Approach 2:
The patent modifies the grayscale parameter of boundary subpixels by applying luminance ratios and grayscale gains. The data processor adjusts the luminance of boundary subpixels based on lookup tables containing luminance ratios and grayscale gains, thereby changing the display parameter to eliminate visible color bands at boundaries while maintaining the different pixel arrangement structures.
2Adaptability or versatility
If the structure of pixels overlapping the camera area is changed to improve transmittivity, then camera integration is enhanced, but the uniformity of the display area is compromised
Solution Approach 1:
The patent creates local quality differences by implementing distinct pixel arrangement structures in different areas: the first pixel area uses a first arrangement structure while the second pixel area (where the camera overlaps) uses a second arrangement structure optimized for transmittivity. This localized adaptation enables camera integration without compromising overall display uniformity.
Solution Approach 2:
The patent employs a feedback mechanism through the data processor that uses lookup tables storing luminance ratios and grayscale gains. The system measures or calculates the luminance of boundary subpixels and adjusts their grayscale values based on pre-stored correction data, providing feedback control to maintain display uniformity despite structural differences.
3Stability of the object's composition
If boundary subpixels are dimmed to reduce color band visibility, then display uniformity is improved, but the luminance of boundary subpixels is reduced
Solution Approach 1:
The patent changes the grayscale parameter of boundary subpixels by applying luminance ratios (less than 1) and grayscale gains from lookup tables. This parameter adjustment reduces the luminance of boundary subpixels to match adjacent subpixels, improving display uniformity while maintaining overall brightness through selective adjustment rather than global dimming.
Data Source
AI summary
A display device includes a display area including a first pixel area, in which pixels including subpixels of a first arrangement structure are disposed, and a second pixel area, in which pixels including subpixels of a second arrangement structure are disposed, a panel driver which provides a driving signal to the display area, and a data processor which converts first image data to second image data, where the first image data corresponds to the boundary subpixel of a first boundary pixel located adjacent to the second pixel area, among the pixels of the first pixel area, and the boundary subpixel of a second boundary pixel adjacent to the first boundary pixel, among the pixels of the second pixel area. The data processor determines the boundary subpixels of the first and second boundary pixels based on boundary types indicating positional relationships between the first and second boundary pixels.