Backlight Optical Member Light Guide Pattern Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Backlight assemblies using light emitting diodes (LEDs) are costly due to high manufacturing expenses, and existing solutions fail to effectively reduce volume and cost while maintaining uniform light distribution.
Innovation Solution
A backlight assembly design incorporating an optical member with a light guide pattern that utilizes total internal reflection to direct light from LEDs, allowing for reduced LED density and optimized light distribution, thereby minimizing volume and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light emitting diodes are used as light sources, then light emitting efficiency is improved and electrical power consumption is reduced, but manufacturing cost increases
Solution Approach 1:
The patent divides the backlight assembly into distinct functional modules: light sources, optical member with light guide pattern, and display panel. This segmentation allows for optimized design of each component, enabling reduced LED density while maintaining uniform light distribution, thereby lowering manufacturing costs while preserving energy efficiency
Solution Approach 2:
The optical member acts as an intermediary between the light sources and the display panel. It includes a light guide pattern that utilizes total internal reflection to redirect and distribute light uniformly across the display panel, allowing fewer LEDs to achieve the same illumination effect, thus reducing manufacturing costs
2Ease of manufacture
If LED density is reduced, then manufacturing cost decreases, but light distribution uniformity may deteriorate
Solution Approach 1:
The optical member incorporates a light guide pattern with varying local properties - different regions have different light guiding characteristics. This local quality variation allows non-uniform light distribution from sparse LEDs to be transformed into uniform overall illumination, maintaining manufacturing precision while reducing LED density
Solution Approach 2:
The patent changes the optical parameters of the light guide pattern, including refractive index distribution and geometric configuration, to control light propagation. By adjusting these parameters, the system achieves uniform light distribution even with reduced LED density, resolving the contradiction between manufacturing cost and light distribution uniformity
3Ease of manufacture
If optical member structure is simplified, then manufacturing cost decreases, but light guiding efficiency may deteriorate
Solution Approach 1:
The light guide pattern in the optical member utilizes total internal reflection, a self-service optical mechanism that automatically redirects light without requiring external control or complex active components. This passive self-service approach maintains high light guiding efficiency while keeping the structure simple and cost-effective to manufacture
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 reduces the number of LEDs required, decreases the assembly's volume, and ensures uniform light brightness to the display panel, lowering overall manufacturing costs while maintaining efficient light distribution.
Implementation Method 1
an optical pattern disposed on the second surface and corresponding to the light source, the optical pattern reflecting a first light of the light incident through the incident surface through total internal reflection
Data Source
AI summary
A backlight assembly includes; a light source including a light emitting surface through which a light exits and an optical member including a first surface disposed adjacent to the light source and a second surface disposed substantially opposite to the first surface, wherein the optical member covers the light source and guides the light therethrough, wherein the optical member includes; an incident surface to which the light is incident, the incident surface being connected with the first surface corresponding to the light source, an optical pattern disposed on the second surface and corresponding to the light source, the optical pattern reflecting a first light of the light incident through the incident surface through total internal reflection and a light guide pattern disposed on the first surface, wherein the light guide pattern directs the reflected first light to an exterior of the optical member.