Multi-Layer Light Guide Assembly for Backlight Brightness and Uniformity
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Solution Overview
Problem
Existing light guide plates (LGP) limit light brightness and uniformity due to structural limitations, and conventional light collimation elements can only collimate light in one direction, resulting in low light utilization efficiency.
Innovation Solution
A light guide assembly comprising a first prism sheet, a dielectric layer, and a second prism sheet, where the refractive indices are sequentially laminated, allowing for total reflection and collimation of light, with the first prism sheet receiving light and reducing its angle, and the second prism sheet reflecting it towards the first direction, enhancing light collimation and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light guide plate is used, then the light can be distributed across the surface, but the light brightness and uniformity are limited due to structural constraints
Solution Approach 1:
The light guide plate is segmented into multiple functional layers: a first prism sheet with light incident side surface, a dielectric layer, and a second prism sheet with reflection surface. Each layer performs a specific optical function to progressively improve light distribution, brightness, and uniformity without requiring complex monolithic structures.
Solution Approach 2:
Different regions of the light guide assembly have specialized structures optimized for their specific functions: the first prism sheet has light incident side surfaces optimized for light input, the dielectric layer provides specific refractive index properties, and the second prism sheet has reflection surfaces optimized for light redirection. This local optimization enables improved overall performance.
2Loss of energy
If conventional light collimation elements are used, then light can be collimated in one direction, but light utilization efficiency remains low because they cannot collimate light in multiple directions
Solution Approach 1:
The light guide assembly performs multiple collimation functions simultaneously through its multi-layer structure. The first prism sheet collimates light in one direction while the second prism sheet with reflection surface collimates light in another direction, enabling the system to handle multi-directional light propagation and significantly improving light utilization efficiency.
Solution Approach 2:
The invention transitions from one-dimensional collimation (single direction) to two-dimensional collimation (multiple directions) by adding the second prism sheet with reflection surface. This dimensional expansion allows light to be collimated in both horizontal and vertical directions, thereby improving overall light utilization efficiency.
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 effectively increases light utilization efficiency by collimating light in multiple directions, improving brightness and uniformity, and reducing the included angle between the light and the direction of propagation, thereby enhancing the collimation effect.
Implementation Method 1
the first prism sheet is configured to receive light being incident to the light incident side surface, totally reflect light with an included angle not smaller than a first angle with a surface of the dielectric layer by the first prism portion, and reduce an included angle between the light being totally reflected and the first direction
Implementation Method 2
the second prism sheet is configured to enable light incident to the second prism portion through the second plane to be reflected towards the first direction by the reflection surface of the second prism portion and emerge from the first prism surface
Implementation Method 3
a light refractive index of the dielectric layer is smaller than a light refractive index of the first prism sheet and a light refractive index of the second prism sheet
Data Source
AI summary
A light guide assembly, a light collimation assembly, a backlight module and a display device are provided. The light guide assembly includes a first prism sheet, a dielectric layer and a second prism sheet sequentially laminated, a light refractive index of the dielectric layer is smaller than that of the first prism sheet and that of the second prism sheet, the first prism sheet includes a light incident side surface, and a first plane and a first prism surface, the first plane is closer to the dielectric layer, and the first prism surface includes first prism portions extending along a second direction, the second prism sheet includes a second plane and a second prism surface, the second plane is closer to the dielectric layer, the second prism surface includes second prism portions extending along the second direction, and the second prism portion has a reflection surface.