Matrix LED Optical Shield Layers Reduce Crosstalk
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing semiconductor light-emitting devices with matrix arrangements of LED elements face challenges in minimizing dark regions and optical crosstalk, with prior solutions either increasing manufacturing costs or leaving significant dark regions due to thick optical shield frames or grid structures.
Innovation Solution
The implementation of thin optical shield layers and transparent plates with optical shield layers on their sides, along with cavities between LED elements to reduce dark regions and suppress optical crosstalk, while maintaining efficient light extraction and manufacturing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If LED elements are spaced farther apart, then optical crosstalk between elements is reduced, but dark regions increase and light emitting regions decrease
Solution Approach 1:
The patent applies local quality by implementing optical shield layers specifically at the side faces of transparent plates positioned between LED elements. This localized shielding approach targets only the regions where optical crosstalk occurs (between adjacent elements) while preserving the light emitting regions of individual LED elements. The optical shield layers are selectively placed rather than uniformly applied across the entire device, allowing differential treatment of different spatial zones.
Solution Approach 2:
The patent introduces transparent plates with optical shield layers as intermediary structures between adjacent LED elements. These intermediaries serve dual functions: they block optical crosstalk through the optical shield layers while maintaining transparency to allow light extraction. The intermediaries act as mediators that resolve the conflict between preventing crosstalk and preserving light emission by providing a structure that performs both functions simultaneously.
2Area of stationary object
If LED elements are spaced closer together, then dark regions are reduced and light emitting regions increase, but optical crosstalk between elements increases
Solution Approach 1:
The optical shield layers are applied locally at the side faces of transparent plates only in the regions where LED elements are positioned adjacent to each other. This localized application ensures that shielding is provided precisely where crosstalk occurs due to close spacing, while not interfering with the light emitting regions. The local quality principle allows the structure to adapt to the close-spacing configuration by providing shielding only where necessary.
3Object-generated harmful factors
If a grid-shaped optical shield frame is used to reduce dark regions and crosstalk, then optical performance improves, but manufacturing cost increases
Solution Approach 1:
The patent segments the optical shielding function into individual optical shield layers applied to separate transparent plates, rather than using a single integrated grid-shaped optical shield frame. This segmentation allows each transparent plate to be manufactured and treated independently, simplifying the manufacturing process. The segmented approach eliminates the need for complex grid frame structures while achieving the same optical isolation effect through multiple simpler components.
Solution Approach 2:
The patent employs thin optical shield layers deposited on transparent plates as a cost-effective alternative to expensive grid-shaped optical shield frames. The optical shield layers can be applied using conventional thin-film deposition techniques, which are more economical than manufacturing and assembling complex grid structures. This approach uses simpler, cheaper components to achieve the required optical performance.
4Object-generated harmful factors
If thick optical shield frames are used to suppress optical crosstalk, then crosstalk is reduced, but dark regions increase due to the frame thickness
Solution Approach 1:
The patent replaces thick rigid optical shield frames with thin optical shield layers deposited on transparent plates. These thin films provide the necessary optical shielding function while occupying minimal space, thereby avoiding the creation of large dark regions. The thin-film approach maintains structural integrity and optical performance while minimizing the volume occupied by shielding materials.
Solution Approach 2:
The patent transitions from using thick three-dimensional optical shield frames to thin two-dimensional optical shield layers applied on the surfaces of transparent plates. This dimensional reduction from volume-based shielding to surface-based shielding achieves the same optical isolation effect with minimal intrusion into the light emitting regions, thereby reducing dark regions while maintaining crosstalk suppression.
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 configuration significantly reduces dark regions and minimizes optical crosstalk between LED elements, enhancing light-emitting regions and extraction efficiency without increasing manufacturing costs, and allows for closer LED element spacing for improved performance.
Implementation Method 1
a wavelength-converting layer 3 including a transparent resin layer 31 having yitrium aluminium garnet Y2Al5O12:Ce3+ (YAG) particles for wavelength-converting blue light into yellow light to form white light
Implementation Method 2
multiple optical shield layers 53 each provided at one of a first side face of a first one of the transparent plates 411, 412, . . . , and 433 and a second side face of a second one of the transparent plates opposing the first side face of the first transparent plate
Data Source
AI summary
A semiconductor light-emitting device includes a support body multiple, multiple light-emitting elements arranged in a matrix on the support body, a transparent resin layer provided on the light-emitting elements, multiple transparent plates provided on the transparent resin layer, each of the transparent plates being provided over one of the multiple light-emitting elements, and multiple optical shield layers each provided at one of a first side face of a first one of the transparent plates and a second the face of a second one of the transparent plates opposing the first the face of the first transparent plate.