Stacking-Type Optical Sheet Module With Pre-Deformed Structural Patterns
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Solution Overview
Problem
The existing stacking-type optical sheet modules in liquid crystal display devices face issues with maintaining optimal inclined and vertical angles of the inclined surface during the joining process, leading to uneven light refraction and reduced brightness due to deformation of the structural patterns.
Innovation Solution
A stacking-type optical sheet module design featuring an upper optical sheet with a first structural pattern and a lower optical sheet with a second structural pattern, where the second unit light-condensing bodies have a gradually decreasing cross-sectional area and are joined with the upper optical sheet, and third unit light-condensing bodies with a shorter vertical distance, maintaining optimal angles through deformation consideration and an adhesive layer for enhanced joining strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the first optical sheet and second optical sheet are joined together with structural patterns having substantially 90-degree vertical angles, then the brightness is enhanced through light condensation, but the shape of the structural pattern is deformed during joining causing uneven light refraction and reduced brightness
Solution Approach 1:
The patent applies preliminary action by pre-forming the structural patterns with specific vertical angles (first vertical angle for the lower optical sheet and second vertical angle for the upper optical sheet) before joining. The lower optical sheet's structural pattern is designed with a first vertical angle that is smaller than the upper optical sheet's second vertical angle, so that when joined, the deformation during joining process results in uniform light refraction angles. This preliminary geometric configuration anticipates and compensates for the joining deformation, ensuring optimal optical performance.
2Strength
If the structural pattern is deformed during the joining process, then the joining strength is improved, but the vertical angle and inclined angle of the structural pattern change causing non-uniform light refraction
Solution Approach 1:
The patent applies parameter changes by deliberately setting different vertical angles for the structural patterns of the lower and upper optical sheets. The lower optical sheet's structural pattern has a first vertical angle that is smaller than the upper optical sheet's second vertical angle. This parameter difference is designed to compensate for the deformation that occurs during joining, ensuring that after joining, the structural patterns maintain uniform light refraction angles while achieving sufficient joining strength.
3Illumination intensity
If the light condensing effect is enhanced through structural patterns, then the brightness is improved, but the deformation of structural patterns during joining reduces the light condensing uniformity
Solution Approach 1:
The patent uses preliminary action by pre-configuring the vertical angles of the structural patterns before joining. The lower optical sheet's structural pattern is designed with a smaller first vertical angle than the upper optical sheet's second vertical angle. This preliminary geometric arrangement anticipates the joining deformation and ensures that after joining, the light refraction angles remain uniform, maintaining stable light condensing effect and brightness.
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 design maintains uniform light refraction angles, enhances joining strength, and prevents the wet-out phenomenon, resulting in improved brightness and optical performance.
Implementation Method 1
The first optical sheet 5 is made up of a base portion 5b and a structural pattern 5a, and emits the light incident from the diffusion sheet 4 by refracting and primarily condensing the light so as to be vertically incident.
Implementation Method 2
The structural pattern 5a is formed to have a triangular cross section, and the vertical angle of the triangular shape is usually substantially 90 degrees.
Implementation Method 3
Light emitted from the light-emitting source 1 is incident on the light guide plate 3 and proceeds inside the light guide plate 3 while generating the total reflection.
Data Source
AI summary
A stacking-type optical sheet module includes an upper optical sheet having a first structural pattern with first unit light-condensing bodies successively repeated and cross-sectional areas gradually decreasing towards the top. A lower optical sheet has a second structural pattern and is below the upper optical sheet in a stack. Second and third unit light-condensing bodies are successively disposed in the second structural pattern. The second unit bodies have a gradually decreasing cross-sectional area toward the top and are joined with the upper optical sheet, and the third unit bodies have a gradually decreasing cross-sectional area toward the top, a vertical distance from a lowest to a highest portion thereof being relatively shorter than a corresponding vertical distance of the second unit bodies. A vertical angle of the highest portion of the second unit bodies is relatively smaller than a vertical angle of the highest portion of the third unit bodies.