Display Device Wavelength Conversion Light Management
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Solution Overview
Problem
Liquid crystal display (LCD) devices suffer from significant light loss due to transmission through polarizers, liquid crystal layers, and color filters, resulting in low transmittance, limited viewing angles, and reduced color reproducibility.
Innovation Solution
A display device with a light source unit providing two lights of different wavelengths, where one pixel includes a wavelength conversion layer to convert one light into another, and another pixel includes a light transmission layer to transmit both lights, allowing for selective emission and blocking to enhance transmittance and color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If light is transmitted through polarizer, liquid crystal layer, and color filter in conventional LCD, then image display is achieved, but significant light loss occurs (only 3-10% of backlight light is utilized)
Solution Approach 1:
The patent employs time-sequential emission of red and blue lights from the light source unit, with corresponding periodic switching of pixel states (transmission/blocking modes). This periodic action allows the system to utilize different light wavelengths at different time intervals, maximizing light usage efficiency while maintaining image quality and achieving high transmittance that overcomes the conventional 3-10% light loss limitation
Solution Approach 2:
The patent changes the wavelength parameter of emitted light by using a light source unit that emits both red light (first wavelength) and blue light (second wavelength). The wavelength conversion layer converts blue light to green light, creating a dynamic wavelength transformation system. This parameter change enables the display to utilize multiple wavelength bands, significantly improving overall light transmittance and energy efficiency
2Adaptability or versatility
If conventional LCD structure with polarizers and color filters is used, then basic image display is achieved, but viewing angle is limited and color reproducibility is reduced
Solution Approach 1:
The patent segments the display into first pixels with wavelength conversion layers and second pixels with light transmission layers. This segmentation allows different regions to handle different wavelengths selectively, improving viewing angle and color reproducibility by managing light paths independently for each pixel type while reducing the need for complex polarizer and color filter assemblies
3Illumination intensity
If wavelength conversion layer converts blue light to green light, then color reproducibility is enhanced, but additional light blocking and conversion mechanisms are required
Solution Approach 1:
The patent merges the wavelength conversion function and light blocking function into integrated pixel structures. The wavelength conversion layer in first pixels combines blue light blocking with green light emission, while second pixels combine blue light transmission with their own emission characteristics. This merging reduces the need for separate, complex light control mechanisms while enhancing color reproducibility through coordinated wavelength management
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 significantly enhances transmittance, viewing angles, and color reproducibility, achieving super resolution by optimizing light usage and management within the display device.
Implementation Method 1
a wavelength conversion layer which transmits the first light and converts the second light into a third light to thereby emit the third light
Data Source
AI summary
A display device includes a display panel comprising a first pixel and a second pixel, and a light source unit providing, to the display panel, a first light and a second light having different wavelengths from each other where the first pixel includes a wavelength conversion layer which transmits the first light and converts the second light into a third light to thereby emit the third light, and the second pixel includes a light transmission layer which transmits the first light and the second light.