LED Pixel Package Structure for Light Crosstalk Reduction
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Solution Overview
Problem
Display modules using light-emitting diodes (LEDs) face issues with light crosstalk between adjacent pixel packages, which reduces display contrast due to the distance and aisles between them, leading to compromised color purity and luminous efficiency.
Innovation Solution
The introduction of a light-absorbing layer between the substrate and the light-transmitting layer in the pixel packages, which covers the upper conductive layer and side walls but not the light-emitting surfaces, effectively blocks light emitted from the side walls and reduces external light reflection, thereby minimizing light crosstalk and enhancing contrast and color purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light-emitting units are arranged closer together to increase resolution, then display resolution is improved, but light crosstalk between adjacent pixels increases
Solution Approach 1:
A light-absorbing layer is introduced as an intermediary substance between adjacent light-emitting units. This layer selectively absorbs stray light that would otherwise travel to adjacent pixels, thereby preventing light crosstalk while allowing the light-emitting units to be positioned closer together for higher resolution displays.
Solution Approach 2:
The harmful stray light is extracted from the optical path by the light-absorbing layer. The layer is strategically positioned to intercept and absorb only the unwanted lateral light propagation between pixels, while permitting the intended forward light transmission to the display surface.
2Object-generated harmful factors
If aisles are increased between pixel packages to reduce light crosstalk, then light crosstalk is reduced, but display area is reduced
Solution Approach 1:
The light-absorbing layer acts as a compact intermediary barrier within the pixel package structure itself, eliminating the need for large aisles between packages. This allows pixel packages to be densely packed while still preventing light crosstalk through the absorbing properties of the layer.
Solution Approach 2:
The optical properties of the pixel package structure are changed by introducing the light-absorbing layer with specific absorption characteristics. This parameter change enables the system to maintain high display area with minimal aisles, as the light absorption function is achieved through material properties rather than increased spatial separation.
3Reliability
If light-transmitting layer covers entire substrate to protect and encapsulate, then protection is improved, but light crosstalk increases
Solution Approach 1:
The encapsulation structure is given local quality variations: the light-transmitting layer maintains high transparency in regions above the light-emitting surfaces to allow light output, while the light-absorbing layer provides localized light absorption in regions between pixels. This spatially differentiated quality approach enables simultaneous protection and crosstalk prevention.
Solution Approach 2:
The encapsulation function is segmented into two distinct layers with different optical properties: the light-transmitting layer provides overall protection and light transmission, while the light-absorbing layer specifically addresses crosstalk prevention. This segmentation allows each layer to optimize its function without compromising the other.
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 improves the display contrast and color purity by ensuring that light is emitted only from the intended surfaces, reducing crosstalk and enhancing the overall luminous efficiency of the pixel packages.
Implementation Method 1
The light-absorbing layer covers the upper conductive layer, the first side wall, and the second side wall
Implementation Method 2
The light-transmitting layer is disposed on the first surface and covers the upper conductive layer, the first light-emitting unit, and the second light-emitting unit
Data Source
AI summary
A package includes a substrate, a first light-emitting unit, a second light-emitting unit, a light-transmitting layer, and a light-absorbing layer. The substrate has a first surface and an upper conductive layer on the first surface. The first light-emitting unit and the second light-emitting unit are disposed on the upper conductive layer. The first light-emitting unit has a first light-emitting surface and a first side wall. The second light-emitting unit has a second light-emitting surface and a second side wall. The light-transmitting layer is disposed on the first surface and covers the upper conductive layer, the first light-emitting unit, and the second light-emitting unit. The light-absorbing layer is disposed between the substrate and the light-transmitting layer, covers the upper conductive layer, the first side wall, and the second side wall, and exposes the first light-emitting surface and the second light-emitting surface.