Liquid Crystal Display Light Source Spectral Optimization
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in power consumption due to their lighting units, particularly in portable devices, and high-saturation color filters reduce light transmission, affecting color reproducibility and efficiency.
Innovation Solution
A liquid crystal display design incorporating a light source with specific emission spectra and low-saturation color filters that transmit light efficiently across red, green, and blue wavelengths, optimizing luminance and color reproducibility while minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-saturation color filters are used to improve color reproducibility, then color saturation is improved, but light transmission is reduced
Solution Approach 1:
The patent changes the spectral parameters of the light source from a continuous spectrum to a multi-peak spectrum with specific wavelength ranges (red: 620-680nm, green: 525-545nm, blue: 430-480nm). This parameter change allows the use of low-saturation color filters while maintaining color reproducibility, as the filtered light still contains distinct spectral peaks corresponding to the three primary colors.
2Loss of energy
If traditional lighting units are used in LCDs, then light transmission is maintained, but power consumption is high
Solution Approach 1:
The patent replaces the traditional mechanical/electrical lighting system (CCFL or EEFL) with a solid-state light emitting diode system. This substitution significantly reduces power consumption while maintaining adequate light transmission, as LEDs are more energy-efficient than fluorescent lamp-based lighting units.
3Loss of energy
If low-saturation color filters are used to improve light transmission, then light transmission is improved, but color saturation is reduced
Solution Approach 1:
The patent changes the spectral distribution parameter of the light source to have separated peaks corresponding to red, green, and blue regions. This parameter change compensates for the reduced saturation effect of low-saturation color filters, as the filtered light still contains well-defined spectral peaks that provide adequate color reproduction.
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 solution enhances luminance and color reproducibility while reducing power consumption by using a light source with separated peaks for red, green, and blue components and low-saturation color filters, effectively addressing the inefficiencies in traditional LCD lighting systems.
Implementation Method 1
a light source, wherein the light source emits a light comprising a red component having a central wavelength of about 620-680 nm and a half amplitude at about 25-70 nm, a green component having a central wavelength of about 525-545 nm and a half amplitude at about 20-50 nm, and a blue component having a central wavelength of about 430-480 nm and a half amplitude at about 25-70 nm
Implementation Method 2
The light source includes a white light emitting diode that is a blue light emitting diode coated with green and red color fluorescent material
Implementation Method 3
The green color filter transmits about 77-85% of the light having a wavelength of about 540 nm and transmits about 15-20% of the light having a wavelength equal to or shorter than about 460 nm
Implementation Method 4
The red color filter transmits at least about 90% of light having a wavelength equal to or longer than about 630 nm, and transmits less than about 10% of light having a wavelength of from about 430 nm to about 560 nm
Implementation Method 5
a liquid crystal (LC) layer exhibiting dielectric anisotropy that, in the presence of an applied electric field, display images by varying the light transmittance of the liquid crystal layer
Data Source
AI summary
A liquid crystal display according to an embodiment of the present invention includes: a liquid crystal panel assembly comprising a plurality of first field-generating electrodes, a second field-generating electrode facing the first field-generating electrodes, a liquid crystal layer disposed between the first field-generating electrodes and the second field-generating electrode, and red, green, and blue color filters disposed at positions corresponding to the first field-generating electrodes; and a light source providing light to the liquid crystal panel assembly, wherein the light source emits a light comprising a red component having a central wavelength of about 620-680 nm and a half amplitude of about 25-70 nm, a green component having a central wavelength of about 525-545 nm and a half amplitude of about 20-50 nm, and a blue component having a central wavelength of about 430-480 nm and a half amplitude of about 25-70 nm.