Optical Sheet Module with Segmented Light Collector Units
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Solution Overview
Problem
Existing backlight units for LCDs require two prism sheets, increasing production costs and thickness limitations, while single reverse prism sheets improve brightness but narrow the viewing angle.
Innovation Solution
An optical sheet module with light collector units having a reverse prism shape and a multi-angle or curved shape to collect light, featuring a base film and light collector units with a light entrance surface and a refracting surface that gradually decreases in cross-section, allowing light to be collected and reflected in different directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single reverse prism sheet is used to reduce thickness and manufacturing costs, then production costs and thickness are improved, but the viewing angle is narrowed
Solution Approach 1:
The single prism sheet is segmented into multiple light collector units with different refracting surface orientations. Each unit has a light entrance surface and a light refracting surface with specific inclination angles, allowing light to be collected and reflected in multiple directions simultaneously, thereby improving viewing angle while maintaining the benefits of a single sheet structure
Solution Approach 2:
Different regions of the light collector part have different local optical properties. The light refracting surface is designed with specific inclination angles in different areas to redirect light toward various viewing angles, creating localized optical functions that collectively improve overall viewing angle performance
2Adaptability or versatility
If two prism sheets are used to improve viewing angle, then viewing angle is improved, but production costs and thickness increase
Solution Approach 1:
The functions of two separate prism sheets are merged into a single integrated light collector part. By combining multiple light collector units with different orientations within one sheet, the patent achieves the viewing angle improvement previously requiring two sheets, while reducing overall thickness and manufacturing complexity
Solution Approach 2:
The single optical sheet module performs multiple functions: it collects light from the light guide plate, redirects light in multiple directions for improved viewing angle, and maintains a compact thin structure. This multi-functional design replaces the need for multiple specialized components
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 optical sheet module enhances the viewing angle of liquid crystal display devices by collecting and reflecting light in multiple directions, improving brightness and reducing thickness and manufacturing costs.
Implementation Method 1
a light refracting surface configured to be disposed opposite to the light entrance surface and reflect the light incident through the light entrance surface to transfer the reflected light upwardly
Implementation Method 2
a light collector part disposed on a lower portion of the base film and including light collector units each having a light entrance surface configured to transmit light emitted by the light source and allow the light to enter the light collector units
Data Source
AI summary
The present invention relates to an optical sheet module that is arranged on one side of a light source and that transfers light upwards. Provided is an optical sheet module comprising: a base film sheet which transmits light; a light entrance surface which is formed in a lower part of the base film, through which light emitted from the light source is transmitted and through which the light enters internally; a light reflection surface which is located in the direction opposite to the light entrance surface, and which reflects light that enters through the light entrance surface and transfers the same upwards; and a light collection part in which a light collector unit having a cross-sectional area that decreases towards a lower part thereof is arranged consecutively and repetitively along the direction in which light is emitted from the light source, wherein the light collection part has a cross-sectional trajectory according to a vertical direction of the light reflection surface being formed retracting in an internal direction with reference to a virtual straight line trajectory from the lowest part to the highest part.