On-board LCD Front Panel Warpage and Glare Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional front panels for on-board liquid crystal displays fail to simultaneously provide glare prevention, high abrasion resistance, high pencil hardness, and effective inhibition of warpage while maintaining impact resistance and heat resistance, especially in extreme temperature and humidity environments.
Innovation Solution
A front panel configuration featuring a high hardness resin composition layer with irregularities on a polycarbonate resin base, where the high hardness resin composition is coextruded with the polycarbonate resin layer, and a hard coat layer with specific thickness and irregularity characteristics is applied to enhance surface hardness and prevent warpage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a polycarbonate resin sheet with acrylic resin hard coat is used, then impact resistance and heat resistance are improved, but surface hardness and abrasion resistance are insufficient
Solution Approach 1:
The patent uses a composite structure with a polycarbonate resin base layer providing impact resistance and heat resistance, and a high hardness resin composition layer (B) with 60-90 mass% polycarbonate and 10-40 mass% cycloaliphatic polyester providing enhanced surface hardness and abrasion resistance. This composite material approach resolves the contradiction by combining materials with complementary properties.
2Object-affected harmful factors
If an anti-glare film with surface irregularities is applied, then glare prevention is improved, but warpage deformation occurs in high temperature environments
Solution Approach 1:
The patent modifies the chemical composition parameters of the resin layers, specifically using a polycarbonate resin (a1) with controlled molecular weight and a high hardness resin composition (B) with specific ratios of polycarbonate to cycloaliphatic polyester. These parameter changes reduce the overall warpage tendency while maintaining anti-glare properties through the irregular hard coat layer surface.
Solution Approach 2:
The multi-layer composite structure with specifically formulated resin compositions in each layer works together to provide dimensional stability. The polycarbonate base layer and the high hardness resin layer with cycloaliphatic polyester create a balanced composite that resists warpage in high temperature environments while maintaining anti-glare functionality.
3Reliability
If the high hardness resin composition layer is made thicker to improve surface hardness, then abrasion resistance is improved, but warpage resistance deteriorates
Solution Approach 1:
The patent optimizes the thickness parameter of the high hardness resin composition layer (B) to a specific range of 10-250 μm. This parameter change balances the competing requirements: sufficient thickness to provide adequate surface hardness and abrasion resistance, but not so thick as to cause excessive warpage. The specific thickness range represents an optimal compromise point.
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 effectively prevents glare, maintains high abrasion resistance and pencil hardness, and inhibits warpage, while ensuring excellent impact resistance and heat resistance, making it suitable for on-board liquid crystal displays in severe environments.
Implementation Method 1
This anti-glare film can scatter outside light by the irregular shape of the surface and thereby prevent visibility from being reduced due to outside light reflection or image reflection
Implementation Method 2
an optical laminate for antireflection is generally disposed on an outermost surface. Such an optical laminate for antireflection suppresses image reflection or reduces reflectance by light scattering or interference
Data Source
AI summary
A front panel for on-board liquid crystal displays has a high hardness resin composition (B) on at least one side of a layer containing a resin (A) having a polycarbonate resin (a1). The front panel satisfies the following conditions (i) to (iv): (i) the thickness of the layer containing a high hardness resin composition (B) is 10 to 250 μm, and the total thickness of the layer containing a resin (A) comprising a polycarbonate resin (a1) and the layer containing a high hardness resin composition (B) is 100 to 3,000 μm; (ii) the high hardness resin composition (B) consists of any one of specific resin compositions (B1) to (B3); (iii) the retardation of the front panel is 3,000 nm or more; and (iv) the standard deviation of the second derivative of the irregular shape of the hard coat layer having irregularities is 0.1 or more.