Light Emitting Device Lateral Wall Openings for Brightness Uniformity
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Solution Overview
Problem
Backlights have become thinner, and there is a demand for a light emitting device that can achieve desired light distribution characteristics to suppress brightness unevenness in divided regions, which existing technologies have not effectively addressed.
Innovation Solution
A light emitting device with a light emitting element, lateral walls, a first light-transmissive member, and a light shielding member, where the lateral walls define specific openings to facilitate light extraction and distribution, and the light shielding member covers the top surface to adjust light distribution characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflective resin is provided on the top surface of an encapsulating resin, then light can be spread in the lateral direction, but brightness unevenness occurs in divided regions
Solution Approach 1:
The lateral walls are divided into multiple walls (first lateral wall, second lateral wall, third lateral wall, fourth lateral wall) with specific openings between them. This segmentation allows light to be extracted through multiple discrete paths, improving light distribution uniformity across divided regions while maintaining lateral light spreading capability
Solution Approach 2:
The patent introduces a light shielding member with specific light transmittance properties positioned at the top surface, creating local variations in light transmission. This allows different regions to have different light transmission characteristics, compensating for brightness unevenness in divided regions while maintaining overall light distribution
2Length of stationary object
If the backlight is made thinner, then the device profile is improved, but light distribution control becomes more difficult
Solution Approach 1:
The patent transitions from controlling light distribution primarily in the lateral direction to utilizing the vertical dimension by introducing a light shielding member at the top surface with controlled light transmittance. This dimensional approach allows effective light distribution control in thinner backlight structures
Solution Approach 2:
The light shielding member acts as an intermediary element between the light emitting element and the external environment. By positioning this mediator at the top surface with specific light transmittance properties, the patent achieves effective light distribution control without increasing overall device thickness
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 device achieves desired light distribution characteristics by effectively extracting light from the light emitting element and shielding it to prevent brightness decrease at the corners of the light emitting region, improving light uniformity.
Implementation Method 1
a first light-transmissive member arranged on or above the light emitting element and the lateral walls
Implementation Method 2
a light shielding member arranged on or above the first light-transmissive member
Data Source
AI summary
A light emitting device includes a light emitting element, lateral walls surrounding the light emitting element, a first light-transmissive member and a light shielding member. The lateral walls includes first to fourth lateral walls. The first and second lateral walls define a first opening therebetween. The second and third lateral walls define a second opening therebetween. The third and fourth lateral walls define a third opening therebetween. The fourth and first lateral walls define a fourth opening therebetween. In the top view, a first straight line passing through the first and third openings extends in a first direction, and a second straight line passing through the second and fourth openings extends in a second direction orthogonal to the first direction. The first light-transmissive member is arranged on or above the light emitting element and the lateral walls. The light shielding member is arranged on or above the first light-transmissive member.