RGBW Display Panel Luminance Conversion for White Color Accuracy
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Solution Overview
Problem
Display devices with pixels that include sub-pixels outputting light of RGBW colors face image quality degradation when converting RGB image signals into RGBW signals due to the inability to accurately represent luminance values of certain sub-pixels in the pixel array configuration.
Innovation Solution
A display device with a specific pixel array configuration where first and second rows of pixels are alternately arranged, allowing the display controller to convert input RGB image signals into RGBW image signals by varying the luminance values of sub-pixels based on the luminance values that cannot be represented in the display panel, ensuring accurate color reproduction and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RGB image signals are converted into RGBW image signals for display on pixels with RGBW sub-pixels, then the display can utilize all sub-pixels including white sub-pixels, but image quality degrades due to inability to accurately represent luminance values of certain sub-pixels
Solution Approach 1:
The patent divides the pixel array into odd rows and even rows with different sub-pixel arrangements. Odd rows have sub-pixels arranged as R-G-B-W while even rows have W-B-G-R arrangement. This segmentation allows the display controller to apply different luminance value variations to different rows, resolving the contradiction by adapting the conversion process to the specific row configuration rather than applying a uniform conversion that would cause image quality degradation.
Solution Approach 2:
The patent applies different luminance value variation strategies to different rows (odd vs even rows) based on their specific sub-pixel arrangements. For odd rows with R-G-B-W arrangement, one conversion formula is used, while for even rows with W-B-G-R arrangement, a different conversion formula is applied. This local quality approach ensures accurate luminance representation in each specific context, preventing the image quality degradation that would result from a universal conversion approach.
2Manufacturing precision
If the pixel array uses alternating odd and even rows with different sub-pixel arrangements, then color reproduction can be improved, but the conversion process becomes more complex
Solution Approach 1:
The display controller pre-determines which row type (odd or even) is being processed and selects the appropriate luminance conversion formula in advance. For odd rows, the controller applies the first conversion formula that accounts for the R-G-B-W arrangement, while for even rows, it applies the second formula for W-B-G-R arrangement. This preliminary action of identifying the row type and selecting the corresponding conversion strategy simplifies the overall process compared to attempting a complex universal conversion, while still achieving accurate color reproduction.
Data Source
AI summary
According to one embodiment, a display device includes a display panel on which first pixels and second pixels are alternately arranged in the columnar direction, and a display controller configured to input a first image signal and to display an image. The first pixels and the second pixels are arranged such that first sub-pixels are adjacent to third sub-pixels in the columnar direction. The display controller is configured to execute conversion of converting the input first image signal into a second image signal, vary the luminance values of the third sub-pixels in the second image signal based on the luminance values of the third sub-pixels in the first image signal which become unable to be represented in the display panel.