Eye-Protecting LCD Wavelength Conversion
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Solution Overview
Problem
Current liquid crystal display devices may emit blue light with wavelengths less than 400 nm, which can damage human eyes, and existing eye-protecting solutions that filter out this light reduce display brightness and backlighting efficiency.
Innovation Solution
A method for manufacturing an eye-protecting liquid crystal display device that incorporates ultraviolet light emitting materials and absorbents in the array and color filter substrates, converting short-wavelength blue light and ultraviolet light into long-wavelength visible blue light, thereby providing eye protection without compromising display brightness or backlighting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blue light resistant protection film is attached to filter off blue light having a wavelength less than 400 nm, then eye protection function is improved, but display brightness and backlighting efficiency deteriorate
Solution Approach 1:
The patent converts the harmful short-wavelength blue light (wavelength < 400 nm) into beneficial long-wavelength visible blue light (wavelength > 400 nm) through a wavelength conversion layer containing phosphor materials. This transforms the harmful radiation into useful visible light that both protects eyes and maintains display brightness, rather than simply blocking the harmful light.
Solution Approach 2:
The patent changes the wavelength parameter of the blue light by introducing a wavelength conversion layer with phosphor materials that convert short-wavelength blue light (λ < 400 nm) into long-wavelength visible blue light (λ > 400 nm). This parameter transformation allows the light to become eye-safe while maintaining visibility and brightness.
2Object-affected harmful factors
If a blue light resistant protection film is attached to filter off blue light having a wavelength less than 400 nm, then eye protection function is improved, but backlighting efficiency deteriorates
Solution Approach 1:
Instead of blocking harmful short-wavelength blue light which would waste energy, the patent converts this harmful light into useful long-wavelength visible blue light through phosphor materials. This energy conversion process preserves the backlighting efficiency by transforming rather than discarding the harmful radiation.
Solution Approach 2:
The wavelength conversion layer with phosphor materials acts as an intermediary between the backlight unit and the display panel. It mediates the harmful short-wavelength blue light by converting it into safe long-wavelength visible light, thereby protecting eyes while maintaining energy efficiency and backlighting performance.
3Object-affected harmful factors
If ultraviolet light emitting materials and absorbents are incorporated in the array and color filter substrates, then harmful ultraviolet light and short-wavelength blue light are converted into safe long-wavelength visible blue light, but device structure complexity increases
Solution Approach 1:
The patent merges the wavelength conversion function with the existing array substrate and color filter substrate by incorporating ultraviolet light emitting materials and absorbents directly into these substrates. This integration approach combines multiple functions (structural support, light filtering, and wavelength conversion) into unified components, reducing overall device complexity despite the added functionality.
Solution Approach 2:
The array substrate and color filter substrate are designed to perform multiple functions simultaneously: they serve as structural supports, light filters, and wavelength conversion media. By making these substrates multi-functional, the patent avoids adding separate dedicated components for each function, thereby limiting the increase in device complexity.
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 method effectively converts harmful ultraviolet light and short-wavelength blue light into safe long-wavelength visible blue light, protecting human eyes while maintaining display brightness and ensuring backlighting efficiency and transmittance.
Implementation Method 1
the short-wavelength blue light and the ultraviolet light so absorbed excite the ultraviolet light emitting materials to give off long-wavelength visible blue light having a wavelength greater than 400 nm
Data Source
AI summary
A method for manufacturing an eye-protecting liquid crystal display device is disclosed, in which an ultraviolet light emitting material and a ultraviolet absorbent are added in a first planarization layer of an array substrate and a second planarization layer of a color filter substrate. The ultraviolet absorbent absorbs short-wavelength blue light having a wavelength less than 400 nm and ultraviolet light emitting from a backlight module. The short-wavelength blue light and the ultraviolet light so absorbed excite the ultraviolet light emitting material to give off long-wavelength visible blue light having a wavelength greater than 400 nm. The first and second planarization layers are thus useful in converting ultraviolet light and short-wavelength blue light having a wavelength less than 400 nm, which could damage human eyes, into long-wavelength visible blue light having a wavelength greater than 400 nm that does not damage human eyes.