Hard-Screen Polarizing Plate with Glass Substrate
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Solution Overview
Problem
Current polarizers in liquid crystal displays face issues with moisture resistance, scratching resistance, impact resistance, and light flux loss, particularly due to their flexible nature and water vapor permeability, which affects the display's durability and image quality.
Innovation Solution
A hard-screen polarizing plate is introduced, comprising a polyvinyl alcohol film with a glass substrate and protective films, which enhances impact resistance, scratching resistance, and reduces thickness while maintaining hardness, and includes anti-reflective and anti-static coatings to improve optical contrast and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a cellulose triacetate membrane is used as a protective layer, then optical homogeneity and transparency are improved, but moisture resistance deteriorates due to water vapor permeability
Solution Approach 1:
The patent uses a composite structure combining polyvinyl alcohol film (providing polarization function) with cellulose triacetate membrane (providing optical homogeneity and transparency). This composite approach allows each layer to contribute its strengths while the overall structure achieves both optical quality and moisture resistance through the synergistic combination of materials.
2Ease of manufacture
If the polarizer is made of flexible materials with thickness of approximately 300 μm, then ease of manufacture is improved, but impact resistance and scratching resistance deteriorate
Solution Approach 1:
The patent creates a composite polarizer structure consisting of multiple layers including polyvinyl alcohol film, cellulose triacetate membrane, and protective films. This composite construction provides both the flexibility needed for manufacturing and the enhanced mechanical strength required for impact and scratch resistance, as each layer contributes different mechanical properties.
Solution Approach 2:
The patent employs thin film structures (cellulose triacetate membrane and protective films) that maintain flexibility for ease of manufacture and assembly, while the multi-layer configuration provides the necessary mechanical protection against impact and scratching through the cumulative strength of multiple thin layers.
3Reliability
If protective films are added to protect the polarizing film, then moisture resistance is improved, but device complexity increases
Solution Approach 1:
The cellulose triacetate membrane in the patent serves multiple functions simultaneously: it provides optical homogeneity, maintains transparency, and offers moisture barrier protection. This multi-functionality reduces the need for separate dedicated protective layers, thereby limiting the increase in structural complexity while achieving improved moisture resistance.
Solution Approach 2:
The patent merges the protective function with the optical function by using the cellulose triacetate membrane to simultaneously provide both optical quality (homogeneity and transparency) and protective function (moisture barrier). This merging of functions into a single layer rather than adding separate protective layers helps control 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 solution provides improved impact resistance, expanded viewing angles, enhanced gradation effects, and lower manufacturing costs, while maintaining an ultra-thin frameless structure, effectively addressing the limitations of traditional polarizers.
Implementation Method 1
a glass substrate which is adhered to a light emitting surface of the polyvinyl alcohol film for serving as a protective layer
Implementation Method 2
The polarizer, which is an optical thin-film composited by multilayers of polymer materials and having a function of generating polarized light
Implementation Method 3
By changing an electrical signal of a liquid crystal layer in the liquid crystal cell of the liquid crystal display, liquid crystal molecules of the liquid crystal layer generate torsional arrangement and form an optical channel having a certain torsion angle
Data Source
AI summary
A hard-screen polarizing plate for a liquid crystal screen includes a polyvinyl alcohol film (1) and a protective film (2). The protective film (2) is adhered to a surface of the polyvinyl alcohol film (1) facing a light emitting surface (41) of a liquid crystal cell (4). The hard-screen polarizing plate further includes a glass substrate (3). The glass substrate (3) is adhered to a light emitting surface (12) of the polyvinyl alcohol film (1) for serving as a protective layer of the second light emitting surface (12) of the polyvinyl alcohol film (1). The hard-screen polarizing plate is adhered to a light emitting surface (41) of the liquid crystal cell (4).