Olive-Shaped Micro-Structures for Backlight Brightness
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Solution Overview
Problem
Conventional backlight modules for LCD devices suffer from reduced light transmission and brightness due to light absorption by diffuser plates and optical plates, as well as air gaps that cause back reflection, limiting their efficiency.
Innovation Solution
An optical plate with micro-structures having an olive-shaped profile and symmetrical side surfaces is introduced, which concentrates emitting angles of output light beams, increasing brightness by refracting, reflecting, and diffracting light at these micro-structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If diffuser plates and optical plates are used to control light beams, then light transmission is achieved, but light absorption occurs reducing brightness
Solution Approach 1:
The optical plate is segmented into multiple functional layers: a base plate and a separate optical element layer with micro-structures. This segmentation allows each layer to perform its specific function optimally - the base plate provides structural support while the micro-structured layer handles light control, reducing overall light absorption.
Solution Approach 2:
The patent introduces micro-structures with specific geometric dimensions (height, width, spacing) on the optical plate surface. These three-dimensional micro-structures create additional optical paths and reduce light absorption by utilizing vertical dimension for light redirection rather than relying solely on planar diffuser plates.
2Illumination intensity
If air gaps exist at interfaces between diffuser plates and optical plate, then assembly is simplified, but back reflection occurs reducing light transmission
Solution Approach 1:
The patent merges the optical plate with the diffuser plate into a single integrated component, eliminating the air gap interface between them. This integration removes the source of back reflection while maintaining the functional separation of light control and light scattering operations.
Solution Approach 2:
The patent introduces a bonding layer or adhesive as an intermediary between the optical plate and diffuser plate, replacing the air gap. This intermediary layer eliminates total internal reflection at the interface while allowing the components to remain separately manufactured and assembled.
3Illumination intensity
If conventional optical plates are used, then light beams can be transmitted, but brightness enhancement is limited
Solution Approach 1:
The patent employs curved micro-structures (arcs, spheres, or other curved shapes) on the optical plate surface instead of flat or angular structures. These curved micro-structures more effectively concentrate and redirect light beams in specific directions, enhancing brightness and improving light utilization efficiency.
Solution Approach 2:
The patent optimizes various parameters of the micro-structures including height, width, spacing, and curvature radius to maximize light concentration and brightness enhancement. By carefully adjusting these geometric parameters, the system achieves superior light utilization compared to conventional optical plates.
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 plate enhances the brightness of the backlight module by at least 14% by effectively concentrating light within a predetermined viewing angle, improving light utilization and efficiency.
Implementation Method 1
concentrates emitting angles of output light beams, increasing brightness by refracting, reflecting, and diffracting light at these micro-structures
Implementation Method 2
concentrates emitting angles of output light beams, increasing brightness by refracting, reflecting, and diffracting light at these micro-structures
Implementation Method 3
concentrates emitting angles of output light beams, increasing brightness by refracting, reflecting, and diffracting light at these micro-structures
Data Source
AI summary
An exemplary optical plate includes a base and an array of micro-structures. The base includes a first surface and a second surface opposite to the first surface. The micro-structures are provided at the first surface. Each micro-structure includes a base surface substantially coplanar with the first surface of the base and two side surfaces. The base surface has an approximately olive-shaped profile enclosed by two arc-outlines. The two side surfaces extend obliquely from the two arc-outlines and intersect at a ridge of the micro-structure.