Blue LCD UV Absorption for Projection Display Lifespan
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Solution Overview
Problem
Blue-color liquid crystal panels in projection type display apparatuses are prone to deterioration due to shorter wavelength light, existing solutions like increasing panel size or reducing terphenyl derivative concentration compromise light resistance and require design changes in substrates and manufacturing processes.
Innovation Solution
Enhancing the ultraviolet absorption spectrum of the blue-color liquid crystal panel's material improves light resistance without altering the design or manufacturing process, by positioning the absorption end on the short wavelength side and using a different liquid crystal material with lower refractive index anisotropy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the size of the blue-color liquid crystal panel is made larger than the other liquid crystal panels, then the lifetime of the blue-color crystal panel is lengthened, but the design of the first substrate and second substrate, manufacturing process and the like must be largely changed
Solution Approach 1:
The invention changes the chemical composition parameters of the liquid crystal layer by adjusting the concentration of terphenyl derivative and adding ultraviolet absorbing agents, rather than changing the physical size of the panel. This allows the blue-color panel to have enhanced light resistance and extended lifetime while maintaining the same panel dimensions and manufacturing process as other panels.
Solution Approach 2:
The invention uses composite materials by combining the liquid crystal layer with specific concentrations of terphenyl derivative and ultraviolet absorbing agents. This composite approach enhances the light resistance of the blue-color panel without requiring changes to the substrate design or manufacturing process, resolving the contradiction between extending lifetime and maintaining design simplicity.
2Quantity of substance
If the concentration of terphenyl derivative in the liquid crystal layer of the blue-color liquid crystal panel is lowered, then the content of terphenyl derivative causing decrease in light resistance is reduced, but light resistance of the panel deteriorates
Solution Approach 1:
The invention introduces ultraviolet absorbing agents as intermediary substances that absorb harmful ultraviolet light before it reaches and damages the liquid crystal layer. These agents act as mediators between the incident light and the liquid crystal material, protecting the panel from UV damage while allowing the terphenyl derivative to maintain its necessary concentration for proper liquid crystal functionality and light resistance.
Solution Approach 2:
The invention converts the harmful effect of ultraviolet light into a beneficial effect by using ultraviolet absorbing agents that absorb the UV radiation and dissipate it as heat. This transforms the previously damaging UV light into a controlled energy dissipation process, protecting the liquid crystal layer from UV-induced deterioration while maintaining the panel's optical properties.
3Reliability
If an ultraviolet absorbing agent is added to the liquid crystal layer of the blue-color liquid crystal panel, then light resistance is enhanced, but the liquid crystal layer cannot avoid receiving light before the ultraviolet absorbing agent absorbs it, and orientation characteristic and the like of the liquid crystal layer may be changed
Solution Approach 1:
The invention applies local quality by positioning the ultraviolet absorbing agents at specific locations within the liquid crystal layer, such as near the liquid crystal molecules or at the interfaces with substrates. This localized placement ensures that UV absorption occurs close to the source of damage while minimizing the overall concentration that could affect liquid crystal orientation characteristics. The ultraviolet absorbing agents are strategically distributed to provide maximum protection with minimal impact on liquid crystal performance.
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 configuration enhances the light resistance of the blue-color panel, reducing deterioration and allowing for high-quality image projection over a longer period without affecting other panels, thus simplifying the design and manufacturing.
Implementation Method 1
an integral value obtained by integrating absorbance of a liquid crystal layer in a wavelength range from 300 nm to 350 nm is smaller than those in any other liquid crystal panels
Data Source
AI summary
In a blue-color liquid crystal panel out of a plurality of liquid crystal panels used in a projection type display apparatus, an integral value obtained by integrating absorbance of the liquid crystal layer thereof in a wavelength range from 300 nm to 350 nm is smaller in comparison with those of the other liquid crystal panels (a red-color liquid crystal panel and a green-color liquid crystal panel). In addition, the absorption end on the long wavelength side of the liquid crystal layer of the blue-color liquid crystal panel is positioned on the short wavelength side in comparison with the liquid crystal layers of the red-color liquid crystal panel and the green-color liquid crystal panel.