RGB to RGBW Signal Conversion via Chromaticity Luminance Mapping
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Solution Overview
Problem
Conventional methods for converting RGB signals to RGBW signals often result in image distortion when directly applied to RGBW displays, due to the low luminous efficiency of RGB primary colors and the need for signal conversion.
Innovation Solution
A method and device that convert RGB input signals into RGBW signals by determining corresponding RGB luminance values based on their position in a chromaticity diagram, ensuring no color distortion and allowing adjustable digital values for improved luminance and contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If RGB signals are directly applied to an RGBW display, then the display device can be constructed with RGB primary colors, but the displayed image will be distorted
Solution Approach 1:
The patent introduces an intermediary conversion process that transforms RGB signals into RGBW signals through chromaticity diagram-based luminance calculation. This intermediary step acts as a mediator between the RGB input signals and the RGBW display, ensuring accurate color representation while utilizing the white sub-pixel for enhanced luminance without causing image distortion
Solution Approach 2:
The patent changes the signal parameters by converting from standard RGB signal format to RGBW signal format with adjusted luminance values. By calculating new luminance output values based on chromaticity coordinates and applying gamma correction, the signal parameters are transformed to match the RGBW display characteristics, resolving the distortion issue
2Ease of manufacture
If RGB primary colors are used in a pixel unit, then the display device can be constructed, but the luminous efficiency is relatively low
Solution Approach 1:
The patent merges the functionality of the white sub-pixel with the RGB color sub-pixels by introducing a fourth channel in the signal conversion. The white sub-pixel is activated alongside the color sub-pixels, combining their luminous contributions to achieve higher overall luminance output and improved luminous efficiency while maintaining color accuracy
Solution Approach 2:
The patent employs a composite signal structure that combines RGB color information with white luminance information. This composite RGBW signal format allows the display to utilize both colored and white light-emitting elements simultaneously, creating a synergistic effect that improves luminous efficiency beyond what RGB alone can achieve
3Illumination intensity
If the digital values of RGBW luminance output values are adjusted to improve luminance, then the luminance of the display device is improved, but the conversion complexity increases
Solution Approach 1:
The patent performs preliminary calculations of luminance output values based on chromaticity diagram regions before the actual signal output. By pre-determining the appropriate luminance values for each sub-pixel type based on the input color coordinates, the system simplifies the real-time conversion process and reduces computational complexity during display operation
Solution Approach 2:
The patent segments the chromaticity diagram into distinct regions corresponding to different sub-pixel combinations (R, G, B, W). This segmentation allows the conversion algorithm to select appropriate luminance values based on which region the input color falls into, simplifying the conversion logic by breaking down the complex color space into manageable zones with predefined conversion rules
Data Source
AI summary
Provided are a method and device for image conversion from RGB signals to RGBW signals. The method includes the steps of converting RGB input signals as received into corresponding RGB luminance input values respectively; determining RGBW luminance output values respectively according to a position relationship between a corresponding point of the RGB luminance input values and regions divided by RGBW in a chromaticity diagram; and converting the determined RGBW luminance output values into corresponding RGBW output signals respectively and outputting the RGBW output signals.