Transparent LCD Ultraviolet Backlight Fluorescence
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Solution Overview
Problem
Transparent LCD devices struggle to maintain adequate brightness under weak ambient light conditions without compromising transparency, as traditional visible light sources used for illumination can reflect and reduce the display's transparency.
Innovation Solution
Incorporating a transparent liquid crystal display device with a color filter substrate and a transparent backlight module featuring an ultraviolet light source and cholesteric liquid crystal cell, where fluorescent materials in the color resin layers are excited by ultraviolet light to enhance display brightness without increasing reflective surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a visible light source is used to illuminate the transparent LCD device, then the display brightness is improved, but the transparency is reduced due to light reflection
Solution Approach 1:
The patent changes the wavelength parameter of the light source from visible light to ultraviolet light. This parameter change allows the illumination to penetrate the transparent LCD device without causing significant reflection, as ultraviolet light has different optical properties compared to visible light. The ultraviolet light source emits light at wavelengths that do not interfere with the transparency of the display panel.
Solution Approach 2:
The patent introduces a fluorescent material as an intermediary substance within the color filter substrate. This fluorescent material absorbs the ultraviolet light and converts it to visible light of the desired color. The fluorescent material acts as a mediator that transforms the invisible ultraviolet illumination into visible display output without requiring the ultraviolet light to pass through the display panel, thus maintaining transparency.
2Object-affected harmful factors
If the ambient light intensity is low, then the transparent LCD device maintains its transparent viewing capability, but the display image brightness decreases
Solution Approach 1:
The patent implements a self-service illumination system where the transparent LCD device illuminates itself using an integrated ultraviolet light source. The system automatically activates the ultraviolet light source when ambient light levels are low, enabling the display to generate its own illumination without external assistance. This self-illumination capability ensures consistent display brightness across varying ambient lighting conditions while maintaining the transparent viewing characteristic.
3Illumination intensity
If a traditional light source is used to increase display brightness, then the image quality is improved, but the power consumption increases
Solution Approach 1:
The patent changes the energy efficiency parameter by using ultraviolet light sources with higher luminous efficiency. Ultraviolet LEDs consume less electrical energy to produce the required illumination output compared to traditional visible light sources. Additionally, the fluorescent conversion process within the color filter substrate is highly efficient, converting ultraviolet energy to visible light with minimal energy loss, thereby reducing overall power consumption while maintaining display brightness.
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
This solution improves picture brightness under low ambient light conditions while maintaining transparency by using invisible ultraviolet light, which supplements ambient light and is efficiently utilized by the cholesteric liquid crystal cell to excite fluorescent materials, reducing power consumption and reflective issues.
Implementation Method 1
fluorescent materials which are excitable to emit corresponding colors
Implementation Method 2
the cholesteric liquid crystal cell is configured to reflect circularly polarized ultraviolet light having an identical rotation direction with the cholesteric liquid crystal molecule
Data Source
AI summary
Embodiments of the present disclosure provides a transparent liquid crystal display device and a display method thereof. The transparent liquid crystal display device includes a transparent liquid crystal display panel and a transparent backlight module, the transparent liquid crystal display panel includes a color filter substrate, the transparent backlight module is disposed on a non-display side of the transparent liquid crystal display panel and includes a transparent light guide plate and an ultraviolet light source, the ultraviolet light source is disposed on a side end of the transparent light guide plate, the color filter substrate includes color resin lasers with different colors, and the color resin layers with different colors are mixed with fluorescent materials which are excitable to emit corresponding colors.