WLED Color Filter Pigment Modification for sRGB Compliance
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Solution Overview
Problem
Liquid crystal displays using white light-emitting diodes (WLEDs) as a backlight source face challenges in achieving natural and standard color performance, as the colors shown often deviate from sRGB or EBU standards due to differences in emission spectra compared to cold cathode fluorescent lamps.
Innovation Solution
A display system that includes a white light-emitting diode (WLED) with a color filter comprising red, green, and blue color resists, where the compositions or concentrations of the pigments in these resists are modified to optimize the transmission spectrum, ensuring specific relations between the emission and transmission spectra to enhance color accuracy and meet chrominance standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If WLEDs are used as backlight source, then power consumption is reduced and volume is minimized, but color performance deviates from standard (sRGB/EBU) and natural appearance
Solution Approach 1:
The patent modifies the transmission characteristics of the color filter by adjusting pigment composition and concentration to transform the WLED emission spectrum into a display spectrum that meets sRGB/EBU standards. This involves changing the optical parameters of the color filter to compensate for WLED spectral deficiencies while maintaining power efficiency
Solution Approach 2:
The color filter acts as an intermediary between the WLED backlight and the liquid crystal display. By optimizing the color filter's transmission spectrum, the patent mediates the interaction between WLED light and color resists to achieve standard-compliant color output without sacrificing the energy benefits of WLED technology
2Manufacturing precision
If color filter transmission spectrum is modified to improve color accuracy, then color performance meets standards, but manufacturing complexity increases
Solution Approach 1:
The patent achieves standard-compliant color accuracy by modifying pigment composition and concentration parameters in the color filter. This approach transforms the complex spectral matching problem into manageable material parameter adjustments, simplifying the manufacturing process while maintaining high color accuracy
Solution Approach 2:
The patent directly addresses color accuracy by modifying the transmission characteristics of the color filter through pigment adjustments. This focused approach on color parameter optimization avoids the need for complex system-level changes, reducing manufacturing complexity while achieving sRGB/EBU compliance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modified color filter system improves color performance, ensuring that the displayed colors meet sRGB or EBU standards by adjusting the transmission rates of specific wavelengths, resulting in more natural and accurate color representation.
Implementation Method 1
a white light-emitting diode (WLED) emitting light having wavelength of λi and having an emission spectrum BL(λi)
Implementation Method 2
the color filter has a transmission spectrum CF(λi)... modifying compositions or concentrations of pigments of the red color resists to increase transmission rate of the wavelength λi
Data Source
AI summary
A method for modifying color resists of color filter includes the steps of: providing a white light-emitting diode (WLED) emitting light having wavelength of λi and having an emission spectrum BL(λi); providing a color filter comprising a plurality of red, green and blue color resists and having a transmission spectrum CF(λi); modifying compositions or concentrations of pigments of the red color resists to increase transmission rate of the wavelength λi ranging between 580 nm and 600 nm for the red color resists; and modifying compositions or concentrations of pigments of the green color resists to increase transmission rate of the wavelength λi ranging between 570 nm and 590 nm for the green color resists. A display is also disclosed herein.