RGBW Data Processing for OELD Luminance and Color Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display technologies, such as LCDs and OELDs, face challenges in enhancing luminance and color sensitivity, especially when displaying primary colors, as they often result in decreased luminance and optical efficiency due to the limitations of color mixing and pixel size.
Innovation Solution
A 4-color data processing system that includes a gamma converting part, a white extracting part, a data determining part, and a reverse-gamma converting part, which processes RGB gray-scale data to generate compensated RGBW data, increasing luminance and optical efficiency by adding white gray-scale data and employing a scaling factor to extend the gray-scale range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If 4-color pixels with white color are employed to improve luminance, then luminance of white color or achromatic color is improved, but luminance of primary colors decreases and color sensitivity is deteriorated
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the white color component based on the displayed color type. For achromatic colors, the white component is maximized to improve luminance, while for primary colors, the white component is reduced or eliminated to maintain color sensitivity. This conditional parameter adjustment resolves the contradiction by adapting the white mixing ratio according to the specific color being displayed.
Solution Approach 2:
The invention introduces dynamic control of the white sub-pixel activation based on the gray-scale data and color type. The white color component is selectively applied only when displaying achromatic or near-achromatic colors, while primary colors are displayed using only RGB sub-pixels. This dynamic switching mechanism allows the system to optimize luminance for white colors without compromising color sensitivity for primary colors.
2Reliability
If color mixing method is used to display primary colors, then color sensitivity is improved, but luminance decreases
Solution Approach 1:
The patent changes the parameter of white color component intensity based on the color type. For primary colors (red, green, blue), the white component parameter is set to zero or minimum, allowing pure color display with high luminance. For achromatic colors, the white component parameter is increased to maximize luminance. This parameter adaptation resolves the contradiction between color sensitivity and luminance.
3Productivity
If pixel size is decreased to increase the number of pixels, then display resolution is improved, but luminance decreases
Solution Approach 1:
The invention extracts the white color component from the traditional RGB mixing method and adds it as a separate fourth channel. This extracted white light, which has high luminance efficiency, is used to supplement the luminance of small pixels without requiring increased pixel size. The white sub-pixel acts as an additional light source that compensates for the reduced area of individual pixels, thereby maintaining luminance while achieving high resolution.
Solution Approach 2:
The patent creates a composite pixel structure combining RGB sub-pixels with an additional white sub-pixel, forming an RGBW composite pixel. This composite structure leverages the high luminance efficiency of white light emission to compensate for the reduced individual pixel area, allowing high resolution displays to maintain adequate luminance levels without increasing pixel size.
4Illumination intensity
If extended gray-scale data is used to display colors with higher luminance, then luminance is improved, but color sensitivity may be compromised
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the white color component based on the displayed color type. For achromatic colors, the white component is maximized to improve luminance, while for primary colors, the white component is reduced or eliminated to maintain color sensitivity. This conditional parameter adjustment resolves the contradiction by adapting the white mixing ratio according to the specific color being displayed.
Data Source
AI summary
An organic electro-luminescent display (OELD) device for processing multi-color gray-scale data, comprises a four-color converting part for converting primary RGB gray-scale data into compensated RGBW gray-scale data by adding white gray-scale data to the primary RGB gray-scale data, a data driving part for processing the compensated RGBW gray-scale data provided from the four-color converting part to generate four-color signals in an analog type, a scan driving part for generating scan signals in sequence, and an OELD panel for emitting light with a color in response to the four-color signals from the data driving part and the scan signals from the scan driving part. The four-color converting part includes a gamma converting part for converting the primary RGB gray-scale data, a white extracting part for extracting a white color component from the gamma-converted RGB data, a data determining part for generating four-color RGBW data by subtracting the white color component from the gamma-converted RGB data and adding the white gray-scale data to the gamma-converted RGB data, and a reverse-gamma converting part for reverse-gamma converting the four-color RGBW data.