Pixel Package Reflective-Absorbing Structure for Optical Crosstalk
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Solution Overview
Problem
The issue of optical crosstalk between adjacent pixel packages in display modules, caused by light emission from the side surfaces of light-emitting units, reduces display contrast and luminous intensity.
Innovation Solution
A pixel package design incorporating a reflective layer and a light-absorbing layer with varying thicknesses to redirect and absorb light emitted from side surfaces, while maintaining emission from the main surfaces, thereby reducing optical crosstalk and enhancing luminous intensity and display contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-absorbing layer is used to cover side surfaces of light-emitting units, then optical crosstalk is reduced, but luminous intensity and light emitting angle are decreased
Solution Approach 1:
The light-absorbing layer is applied selectively only to the side surfaces of the light-emitting units, while the top light-emitting surfaces remain uncovered. This localized application allows the side surfaces to absorb stray light and reduce optical crosstalk, while preserving the full luminous intensity and light emitting angle from the top surfaces.
Solution Approach 2:
The packaging structure is segmented into different functional zones: the top surface maintains high light transmission for optimal emission, while the side surfaces are covered with light-absorbing material to prevent crosstalk. This segmentation allows each surface to perform its specific function optimally.
2Object-affected harmful factors
If a light-absorbing layer is used to cover side surfaces of light-emitting units, then optical crosstalk is reduced, but display contrast is decreased
Solution Approach 1:
The light-absorbing layer is applied selectively only to the side surfaces of the light-emitting units, while the top light-emitting surfaces remain uncovered. This localized application allows the side surfaces to absorb stray light and reduce optical crosstalk, while preserving the full luminous intensity and light emitting angle from the top surfaces.
Solution Approach 2:
The packaging structure is segmented into different functional zones: the top surface maintains high light transmission for optimal emission, while the side surfaces are covered with light-absorbing material to prevent crosstalk. This segmentation allows each surface to perform its specific function optimally.
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 design effectively minimizes optical crosstalk, improves luminous intensity, and enhances display contrast by redirecting and absorbing light from side surfaces, while maintaining color purity and adjustability of light emitting angles.
Implementation Method 1
The reflective layer is arranged on the top surface and connected to the conductive layer
Implementation Method 2
the light-absorbing layer 25 covers the side surfaces 21W, 22W, 23W of the light-emitting units 21, 22, 23, the lights generated by the light-emitting units 21, 22, 23 only can be able to emit out from the light-emitting surfaces 21S, 22S, 23S, respectively. Most of the lights emitted from the side surfaces 21W, 22W, 23W could be absorbed by the light-absorbing layer 25
Data Source
AI summary
A pixel package includes a carrier, a first light-emitting unit, a second light emitting unit, a reflective layer, and a light-absorbing layer. The carrier has a top surface and a conductive layer. The first light-emitting unit and the second light-emitting unit are arranged on the conductive layer and have a light-emitting surface and a side surface respectively. The reflective layer is arranged on the top surface and contacts the conductive layer. The light-absorbing layer is arranged on the reflective layer and contacts the first side surface and the second side surface while exposing the first light-emitting surface and the second light-emitting surface. In a cross-sectional view, the light-absorbing layer has a first thickness and a second thickness between the first side surface and the second side surface. The first thickness is farther away from and the first side surface than the second thickness, and is smaller than the second thickness.