Display Subpixel Luminance Control for Centroid Alignment
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Solution Overview
Problem
Conventional display devices with delta-nabla arrangements face issues in accurately determining luminance values for subpixels, leading to centroid deviations and inappropriate color mixing, especially in real-resolution displays where the center of luminance shifts, causing unintended color visibility.
Innovation Solution
The display device employs a control device to determine luminance values for two types of display pixels, with specific configurations of red, green, and blue subpixels, ensuring that the centroid of luminance for each type of display pixel aligns with its centroid, using a driver IC to generate luminance data that assigns appropriate values to subpixels based on frame pixel data, thereby correcting centroid alignment and color representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional delta-nabla subpixel arrangements are used, then the display device achieves real-resolution display capability, but the center of luminance shifts from the pixel centroid causing color mixing errors
Solution Approach 1:
The patent applies local quality by differentiating the treatment of subpixels based on their position within the display pixel. Different luminance values are assigned to different subpixels (R1, R2, G1, G2, B1, B2) depending on whether they are shared with adjacent pixels or exclusive to the current pixel. This localized differentiation corrects the luminance centroid alignment for each specific subpixel configuration, ensuring accurate color representation while maintaining real-resolution display capability.
2Device complexity
If shared subpixels are used between adjacent display pixels, then the number of subpixels per pixel is reduced, but the luminance distribution becomes unbalanced causing centroid deviation
Solution Approach 1:
The patent changes the luminance parameter values assigned to shared subpixels versus exclusive subpixels. Specifically, shared subpixels (R1, G2, B1) are assigned different luminance values compared to exclusive subpixels (R2, G1, B2) to compensate for the double-counting effect. This parameter adjustment ensures that the weighted sum of luminance values correctly positions the luminance centroid at the pixel center, resolving the centroid deviation caused by shared subpixel usage.
Data Source
AI summary
For the first type of display pixel, a display device determines a luminance value assigned from a first frame pixel to the green subpixel, a luminance value assigned from the first frame pixel to each of the two red subpixels to be a value lower than a luminance value for one red subpixel, and a luminance value assigned from the first frame pixel to each of the two blue subpixels to be a value lower than a luminance value for one blue subpixel. For the second type of display pixel, the display device determines a luminance value assigned from a second frame pixel to each of the red subpixel and the blue subpixel, and a luminance value assigned from the second frame pixel to each of the two green subpixels to be a value lower than a luminance value determined for one green subpixel.