Integrated Optical Sheet Module for Backlight Units
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Solution Overview
Problem
Conventional optical sheet modules for liquid crystal display devices face challenges in maintaining uniform brightness and wide viewing angles due to the removal of diffusion and reflective polarizing sheets, leading to insufficient light diffusion and narrow viewing angles when trying to thin the backlight unit.
Innovation Solution
An integrated optical sheet module is developed without a diffusion sheet or reflective polarizing sheet, comprising a first and second base film with light condensing components and a viewing angle improvement component, where the first extension direction and second extension direction are perpendicular, and the viewing angle improvement component is formed on the bottom surface to enhance light reflection and diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If diffusion sheet and reflective polarizing sheet are removed to reduce thickness, then overall thickness is reduced, but brightness uniformity deteriorates and viewing angle becomes narrow
Solution Approach 1:
The patent merges the functions of diffusion sheet, condensing sheet, and reflective polarizing sheet into a single integrated optical sheet. This integration maintains the light diffusion and brightness enhancement functions while reducing the overall thickness by eliminating the need for multiple separate layers and adhesive materials between them.
Solution Approach 2:
The integrated optical sheet performs multiple functions simultaneously: it diffuses light in the vertical direction through first light condensing units, condenses light in the horizontal direction through second light condensing units, and reflects light through the viewing angle improvement component. This multi-functionality replaces what previously required three separate sheets.
2Length of stationary object
If diffusion sheet is removed to reduce thickness, then overall thickness is reduced, but light diffusion becomes insufficient
Solution Approach 1:
The diffusion function is merged into the integrated optical sheet through the first light condensing units formed on the first base film. These units create light diffusion paths that eliminate the need for a separate diffusion sheet while maintaining adequate light distribution.
3Length of stationary object
If reflective polarizing sheet is removed to reduce thickness, then overall thickness is reduced, but brightness enhancement becomes insufficient
Solution Approach 1:
The reflective polarizing function is merged into the integrated optical sheet through the viewing angle improvement component formed on the bottom surface of the first base film. This component reflects light back through the light guide plate, enhancing brightness without requiring a separate reflective polarizing sheet.
Solution Approach 2:
The patent addresses brightness enhancement by adding a vertical dimension component (viewing angle improvement component on the bottom surface) rather than relying solely on horizontal light distribution. This dimensional approach allows light reflection and brightness enhancement without adding horizontal thickness.
4Adaptability or versatility
If viewing angle improvement component is added to enhance left-to-right viewing angle, then viewing angle is improved, but device complexity increases
Solution Approach 1:
The viewing angle improvement component is merged into the integrated optical sheet as an integral part of the first base film structure. By forming this component directly on the bottom surface during the same manufacturing process, the patent avoids the complexity of assembling separate components while still achieving enhanced left-to-right viewing angle.
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
This configuration simplifies manufacturing, reduces the overall thickness of the backlight unit, and significantly improves the left-to-right viewing angle while minimizing brightness drop, achieving similar brightness to conventional modules with a thinner profile.
Implementation Method 1
a viewing angle improvement component wherein a unit formed on the bottom surface of the first base film being protruded is formed in a third extension direction which is different from the first extension direction and is sequentially and repeatedly arranged thereby improving a left to right viewing angle through a total reflection
Data Source
AI summary
The present invention provides an integrated optical sheet module where an optical sheet is integrally formed without a diffusion sheet, a condensing sheet and a reflective polarizing sheet thereby reducing the overall thickness and improving the viewing angle, so that a manufacturing process can be simplified and significantly improve the left to right viewing angle while minimizing the brightness drop by forming the first base film having the viewing angle improvement component on the bottom surface with a haze characteristic.