LCOS Display UV Cut Filter for Dam Curing
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Solution Overview
Problem
LCOS display panels face performance deterioration due to UV light exposure, which ages the liquid crystal and polyimide layers, requiring costly UV masks and increased manufacturing time for alignment.
Innovation Solution
Incorporation of a UV cut filter, preferably an interference filter with multiple thin films of SiO2 and Ta2O5, to reflect UV light during curing while allowing visible light transmission, eliminating the need for UV masks and protecting the LC layer from UV exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV light is used to cure the dam material, then the dam is successfully cured and sealed, but UV light ages the LC molecules and deteriorates the display panel performance
Solution Approach 1:
The patent divides the glass substrate into two functional regions: a UV-transparent region allowing UV light to pass through for dam curing, and a UV-blocking region that prevents UV light from reaching the LC layer. This spatial segmentation resolves the contradiction by directing UV light only where needed while protecting sensitive areas.
Solution Approach 2:
The glass substrate is designed with non-uniform optical properties: certain regions are made UV-transparent while others are made UV-blocking. This local differentiation in material properties allows simultaneous achievement of effective dam curing in UV-transparent regions and LC layer protection in UV-blocking regions.
2Object-affected harmful factors
If a UV mask is used to protect the LC layer from UV light, then the LC layer is protected from aging, but the manufacturing cost increases and manufacturing time increases due to alignment requirements
Solution Approach 1:
The patent combines the UV protection function with the glass substrate itself by creating a UV-blocking region integrated into the substrate structure. This eliminates the need for a separate UV mask component and its associated alignment and positioning steps, thereby reducing manufacturing complexity while maintaining LC layer protection.
Solution Approach 2:
The glass substrate is designed to serve multiple functions simultaneously: it acts as both the structural support for the display panel and as the UV protection mechanism through its UV-blocking region. This multi-functionality eliminates the need for dedicated UV mask components and simplifies the manufacturing process.
3Reliability
If a UV mask is used to prevent UV light from reaching the LC layer, then the LC molecules are protected from aging, but the manufacturing time increases due to UV mask alignment for each processed wafer
Solution Approach 1:
The UV-blocking structure is pre-integrated into the glass substrate during substrate fabrication, before the wafer processing begins. This preliminary incorporation of the protection mechanism eliminates the need for time-consuming mask alignment steps during each wafer processing cycle, thereby improving manufacturing throughput while maintaining reliable LC layer protection.
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 UV cut filter effectively prevents UV light from reaching the LC and polyimide layers, maintaining their optical and physical characteristics, reducing manufacturing costs and time, and ensuring the longevity of the LCOS display panel.
Implementation Method 1
UV cut filter, preferably an interference filter with multiple thin films of SiO2 and Ta2O5
Implementation Method 2
to reflect UV light during curing while allowing visible light transmission
Implementation Method 3
an interference filter comprising multiple thin films
Data Source
AI summary
A LCOS display panel comprises a silicon substrate, a pixel structure on the silicon substrate, a first and a second PI (polyimide) layers, a LC (liquid crystal) layer between the first and the second PI layers, wherein the second PI layer is disposed on the pixel structure, and the LC layer is disposed on the second PI layer, a glass substrate, an ITO (indium tin oxide) layer, a dam sealing a perimeter of the LCOS display panel to enclose the LC layer within the dam, wherein the dam is disposed between the first and second PI layers, and holds the silicon substrate and the glass substrate together, and a UV (ultra violet) cut filter in an active area of the LCOS display panel, wherein the active area of the LCOS display panel includes the LC layer and the pixel structure.