Backlight Module Optical Adjustment Layer for Thin Profile
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Solution Overview
Problem
Existing backlight modules for LCD devices face challenges in reducing thickness while maintaining uniform illumination, which is exacerbated by the need for a sufficient optical path to mix light emitted by light emitting elements.
Innovation Solution
The proposed solution involves a backlight module with an optical adjustment layer having a refractive index greater than air, which covers light emitting elements and fills the remaining space in the backlight cavity, allowing for a significant reduction in cavity height while ensuring uniform light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the backlight cavity height is reduced to thin the backlight module, then the thickness is reduced, but the uniformity of light distribution deteriorates due to insufficient optical path for light mixing
Solution Approach 1:
The patent changes the refractive index parameter of the medium filling the backlight cavity from air (n=1.0) to a material with higher refractive index (n>1.0). This parameter change increases the optical path length within the same physical cavity height, enabling sufficient light mixing and uniformity even when the backlight module is thinned to less than 2mm thickness.
2Quantity of substance
If the quantity of light emitting elements is reduced to lower costs, then the cost is reduced, but the uniformity of illumination deteriorates
Solution Approach 1:
By changing the refractive index parameter of the cavity filling material, the optical path is extended, which enhances light mixing efficiency. This allows the system to maintain uniform illumination even with a reduced quantity of light emitting elements, thereby lowering costs while preserving performance.
3Stability of the object's composition
If the optical path length is increased to improve light mixing, then the uniformity of light distribution is improved, but the backlight module thickness increases
Solution Approach 1:
The patent applies parameter change by increasing the refractive index of the cavity filling material. This allows the optical path length to be effectively increased within a compressed physical space, achieving good light mixing and uniformity without increasing the overall backlight module thickness.
Solution Approach 2:
The patent introduces an intermediary material with higher refractive index to fill the backlight cavity. This intermediary substance acts as a mediator that enhances light interaction and mixing, enabling sufficient optical path length within a thin profile structure.
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 enables the backlight module to be thinned to less than 2 mm, reducing the required quantity of light emitting elements and lowering costs, while maintaining high uniformity of the outputted light.
Implementation Method 1
The optical adjustment layer has a refractive index n greater than the refractive index no of the air
Data Source
AI summary
An electronic device includes a substrate, a sidewall, a plurality of light emitting elements and an optical element. The sidewall is connected to the substrate. The plurality of light emitting elements are disposed on the substrate. The optical element covers at least two of the plurality of light emitting elements, wherein, in a cross-sectional view of the electronic device, a portion of the optical element is disposed between two adjacent ones of the plurality of light emitting elements, and a height of the sidewall is greater than a thickness of the optical element.