Optical Sheet Base Segmentation for LCD Rigidity
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving desired luminance and preventing deflection due to the difficulty in manufacturing prism geometry, leading to rounded apex and base angles, which affects beam condensing efficiency and moire fringe prevention, especially as screen size increases, resulting in insufficient rigidity and assembly issues.
Innovation Solution
An optical sheet with a light-transmissive base composed of a stack of bonded light-transmissive sheets using an adhesive material layer, providing adjustable thickness for rigidity and preventing deflection, along with a beam-condensing layer with irregularities such as prisms or cylindrical lenses, and a diffusion layer for improved light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the screen size is increased, then the display area is enlarged, but the rigidity becomes insufficient and deflection occurs
Solution Approach 1:
The base is divided into multiple sheets (first sheet and second sheet) that are bonded together. This segmentation allows each sheet to contribute to the overall rigidity while maintaining the required large screen area, effectively preventing deflection in larger displays.
Solution Approach 2:
The base is constructed as a composite structure with multiple sheets bonded together using an adhesive material layer. This composite configuration enhances the rigidity and mechanical strength of the base, enabling it to support larger screen sizes without experiencing deflection or deformation.
2Object-generated harmful factors
If the prism pitch is narrowed to prevent moire fringes, then the moire fringes are suppressed, but the manufacturing precision becomes difficult to maintain due to rounded apex and base angles
Solution Approach 1:
The invention changes the pitch parameter of the prisms to a specific range (50 μm to 150 μm) that effectively suppresses moire fringes while remaining feasible for manufacturing. This parameter optimization balances the suppression of optical interference patterns with the practical constraints of manufacturing precision, avoiding the need for excessively narrow pitches that would cause apex and base angle rounding.
3Strength
If the base thickness is increased to improve rigidity, then the deflection is reduced, but the manufacturing complexity increases
Solution Approach 1:
Instead of using a single thick base that would be complex to manufacture, the base is segmented into multiple thinner sheets bonded together. This approach achieves the required rigidity and deflection prevention while maintaining simpler manufacturing processes for each individual sheet, reducing overall structural 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 ensures appropriate rigidity and stiffness, preventing deflection and enhancing beam condensing efficiency, while suppressing moire fringes and maintaining image quality across larger screen sizes.
Implementation Method 1
a base composed of a stack of transmissive sheets, in which the base is composed of a stack of light-transmissive sheets bonded while placing an adhesive material layer in between
Implementation Method 2
The prism sheet 103 condenses beam from the light source 101 coming thereinto and beam reflected on the reflective plate 102 in the front direction, by allowing them to refract at the slope of the prism 103a of the prism
Implementation Method 3
the diffusion sheet 104 diffuses beam once condensed by the prism sheet 103 over a wide angular range, and allows it to emit so as to uniformalize the luminance
Data Source
AI summary
An optical sheet is provided. The optical sheet includes: a light-transmissive base; and an optical functional layer provided to at least one surface of the base, in which the base is composed of a stack of transmissive sheets bonded while placing an adhesive material layer in between.