RGBW Data Conversion Unit for High Contrast LCD Displays
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Solution Overview
Problem
Display devices face challenges in achieving high brightness and contrast ratio while reducing power consumption, particularly for LCDs, due to limitations in controlling white color brightness and the complexity of multi-frame HDR imaging technology.
Innovation Solution
A data conversion unit and method that transforms R, G, and B sub-pixel data signals into R, G, B, and W signals, allowing independent brightness control of white data signals and saturation reinforcement based on color attributes, using a tone mapping curve and saturation gain adjustments to enhance contrast ratio without increasing backlight brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multi-frame HDR imaging technology is employed to realize high dynamic range, then high brightness and contrast ratio are achieved, but device complexity and memory capacity increase
Solution Approach 1:
The patent transforms image data from RGB color space to RGBW color space by introducing a white (W) channel. This parameter change in the data representation enables independent control of white pixel brightness, achieving high brightness and contrast ratio without requiring complex multi-frame HDR processing. The transformation portion converts standard RGB images into RGBW format, allowing the white channel to carry brightness information separately from color information.
2Illumination intensity
If multi-frame HDR imaging technology is employed to realize high dynamic range, then high brightness and contrast ratio are achieved, but memory capacity increases
Solution Approach 1:
By transforming to RGBW color space and utilizing the white channel for brightness information, the patent reduces the need for multiple frames required by HDR technology. This parameter change in color space representation allows achieving high brightness with standard single-frame images, thereby reducing memory capacity requirements compared to multi-frame HDR approaches.
3Illumination intensity
If LCD display device increases brightness, then peak brightness is improved, but control over white color brightness becomes difficult due to liquid crystal transmittance limitations
Solution Approach 1:
The patent segments the brightness control function by introducing a dedicated white (W) channel in the RGBW color space. This segmentation separates white color brightness control from the RGB color channels, allowing independent adjustment of the white channel's brightness through the brightness reinforcement portion. The white pixel data can be enhanced separately without affecting color balance, making brightness control straightforward despite liquid crystal transmittance limitations.
4Illumination intensity
If LCD display device increases brightness, then peak brightness is improved, but power consumption increases
Solution Approach 1:
The patent changes the color space parameter from RGB to RGBW, utilizing the white channel's property of requiring less energy to produce high brightness. The white sub-pixels can generate higher luminance with lower power consumption compared to combining RGB sub-pixels, as the white channel directly represents luminance information. This parameter change enables high brightness output with reduced power consumption in LCD display devices.
Data Source
AI summary
A data conversion unit is disclosed which includes: a transformation portion configured to transform R (red), G (green) and B (blue) sub-pixel data signals of input image data into R, G, B and W (white) sub-pixel data signals; and a brightness reinforcement portion configured to adjust brightness of a transformed W sub-pixel data signal included in the transformed R, G, B, and W sub-pixel data signals based on brightness distribution of the input image data.