Wavelength Conversion Layer Prevents Color Mixing in LCD
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices using a color conversion layer with phosphor suffer from color mixing between adjacent pixels, which degrades display quality and viewing angle.
Innovation Solution
Incorporating a wavelength conversion layer that converts light from the backlight into infrared rays, preventing color mixing by adjusting the lightpath length and using quantum dot particles to emit specific colors, thereby isolating light between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color conversion layer including phosphor is used to improve viewing angle and color reproduction, then viewing angle and color reproduction are improved, but color mixing between adjacent pixels occurs and display quality deteriorates
Solution Approach 1:
A wavelength conversion layer is introduced as an intermediary component between the backlight unit and the color conversion layer. This layer converts light from the backlight into infrared rays, which then interact with the color conversion layer to produce the desired visible colors. The wavelength conversion layer acts as a mediator that enables the color conversion layer to function properly while preventing color mixing between adjacent pixels, thus resolving the contradiction between improved color reproduction and maintained display quality.
Solution Approach 2:
The patent changes the wavelength parameter of light by introducing a wavelength conversion layer that converts backlight light into infrared rays. This parameter change (from visible light wavelengths to infrared wavelengths) allows the system to achieve both improved color reproduction through the color conversion layer and prevention of color mixing, as the infrared rays do not cause the same optical interference issues as visible light wavelengths.
2Manufacturing precision
If a wavelength conversion layer is added to prevent color mixing, then color mixing is prevented and display quality is improved, but device complexity increases
Solution Approach 1:
The wavelength conversion layer serves multiple functions simultaneously: it converts backlight light into infrared rays, prevents color mixing between adjacent pixels, and enables the color conversion layer to achieve excellent color reproduction. By combining these functions into a single component, the patent improves display quality without proportionally increasing device complexity, as the wavelength conversion layer accomplishes multiple objectives in one element.
Solution Approach 2:
The patent combines the wavelength conversion function and the color conversion function into an integrated structure where the wavelength conversion layer is positioned directly adjacent to the color conversion layer. This merging of functions reduces the overall number of separate components needed and simplifies the device structure while still achieving the goal of preventing color mixing and improving display quality.
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 wavelength conversion layer effectively prevents color mixing, enhancing color reproduction and display quality while allowing for infrared radiation for skincare functions.
Implementation Method 1
The wavelength conversion layer may convert light emitted from the backlight unit into infrared rays
Implementation Method 2
The phosphor may include a quantum dot particle
Data Source
AI summary
A display device having a first substrate, a second substrate above and facing the first substrate, a light-amount adjusting layer interposed between the first substrate and the second substrate, a plurality of color conversion layers respectively defining a plurality of pixel regions, a wavelength conversion layer disposed on a bottom surface of the color conversion layers, and a backlight unit disposed under the first substrate. The light-amount adjusting layer comprises liquid crystal molecules.