Light Guide Device Protrusion Geometry for Collimation
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Solution Overview
Problem
Existing light guide devices have reduced light output efficiency due to the superimposition of metal electrodes and grating structures, requiring complex liquid crystal control for collimation, which complicates the manufacturing and usage of display devices.
Innovation Solution
A light guide device with an optical waveguide layer and a reflection layer featuring protrusions that form specific angles, allowing light to be incident at a predetermined angle, enhancing light output efficiency and simplifying control through the use of a collimation incident light source and a light modulation device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal electrodes and grating structures are superimposed in existing light guide devices, then collimation can be achieved, but light output efficiency is reduced
Solution Approach 1:
The patent extracts and removes the metal electrode layer from the light guide device structure. By eliminating this absorbing layer, the device achieves higher light output efficiency without requiring complex liquid crystal control mechanisms, thus resolving the contradiction between illumination intensity and device complexity
Solution Approach 2:
Instead of using the conventional approach of superimposing metal electrodes and grating structures to achieve collimation, the patent inverts the approach by using a simplified reflection layer with protrusions that redirects light through total internal reflection, eliminating the need for complex controlling mechanisms
2Ease of operation
If complex liquid crystal control is used for collimation, then light direction can be controlled, but manufacturing and usage become complicated
Solution Approach 1:
The patent removes the liquid crystal control layer and metal electrode structures from the device. The collimation function is achieved passively through the geometric design of protrusions on the reflection layer, which redirect light via total internal reflection, thereby simplifying both manufacturing and operation
Solution Approach 2:
The light guide device achieves collimation automatically through the geometric configuration of protrusions on the reflection layer. The structure itself performs the collimation function without requiring external control mechanisms, making the device self-sufficient and easier to manufacture
3Illumination intensity
If protrusions are formed on the reflection layer with specific angles, then light output efficiency is enhanced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating protrusions with specific geometric characteristics (first angle α between 0-45 degrees, second angle β between 45-90 degrees) only in the reflection layer where they are needed for light redirection. This localized geometric modification enhances light output efficiency while maintaining manufacturability through focused precision requirements
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 achieves high light output efficiency and simplifies the control of collimating surface light sources, improving the performance and usability of display devices by maximizing light intensity and reducing complexity in manufacturing and assembly.
Implementation Method 1
a reflection layer one surface of which is connected with the optical waveguide layer, said one surface including a plurality of protrusions
Implementation Method 2
light of the collimation incident light source is incident on an incident end face of the optical waveguide layer at a predetermined angle
Data Source
AI summary
The present disclosure has disclosed a light guide device, comprising an optical waveguide layer (100), and a reflection layer (110) one surface of which is connected with the optical waveguide layer, said one surface including a plurality of protrusions (113), each protrusion including a first surface (114) forming a first angle (θ1) with respect to a surface of the optical waveguide layer, and a first intersection line (116) between a plane in which the surface of the optical waveguide layer is located and a plane in which the first surface is located being perpendicular to a light guiding direction of the optical waveguide layer. The present disclosure has disclosed a manufacturing method of a light guide device as well as a backlight module and display device including the light guide device at the same time.