LED Pixel Package Structure for Light Crosstalk Suppression
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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 aisle gaps between them, leading to decreased luminous efficiency and color purity.
Innovation Solution
The implementation of a light-absorbing layer between the substrate and the light-transmitting layer in the pixel packages, along with a reflective wall on the side walls of the light-emitting units, helps to block light emitted from the side walls and absorb external light, reducing crosstalk and enhancing contrast and luminous efficiency.
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 absorbs stray light that would otherwise cause crosstalk, allowing pixels to be placed closer together while maintaining display quality. The light-absorbing material acts as a mediator that prevents harmful light interaction between neighboring pixels.
Solution Approach 2:
The patent applies different optical properties to different regions: the light-absorbing layer is strategically positioned in areas where crosstalk occurs (between and around light-emitting units), while the light-emitting units themselves maintain their light-emitting properties. This localized application of light-absorbing material针对性地 solves the crosstalk problem without affecting the overall display functionality.
2Quantity of substance
If aisle gaps between pixel packages are reduced to increase density, then device density is improved, but light crosstalk between adjacent pixel packages increases
Solution Approach 1:
The light-absorbing layer extends to fill the aisle gaps between adjacent pixel packages, acting as an optical barrier. This intermediary layer prevents light from one pixel package from leaking into adjacent packages, enabling higher device density without sacrificing display contrast or introducing crosstalk.
3Use of energy by moving object
If light-transmitting layer is made more transparent to improve light output, then luminous efficiency is improved, but external light interference increases
Solution Approach 1:
The patent converts the potentially harmful effect of external light entering through the transparent light-transmitting layer into a beneficial outcome. The light-absorbing layer absorbs this external light that would otherwise cause interference or reduce display contrast, while allowing the light-transmitting layer to remain highly transparent for optimal light output from the LEDs.
4Measurement precision
If reflective walls are added to block side wall light emission, then color purity is improved, but device complexity increases
Solution Approach 1:
The reflective walls are merged with the light-absorbing layer structure, combining light absorption and light reflection functions into a single integrated component. This reduces overall device complexity while maintaining color purity, as the light-absorbing layer with reflective walls acts as a unified structure rather than separate elements.
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 effectively minimizes light crosstalk, improves display contrast, and increases luminous efficiency by ensuring light emission only from the intended surfaces, thereby enhancing color purity and overall display performance.
Implementation Method 1
a light-absorbing layer, which is arranged between the substrate and the light-transmitting layer in a continuous configuration of separating the first light-emitting unit and the second light-emitting unit from each other
Implementation Method 2
a reflective wall, which is arranged on the first side wall
Data Source
AI summary
A package comprises a substrate including a first surface, and an upper conductive layer arranged on the first surface, a first light-emitting unit arranged on the upper conductive layer, and comprises a first semiconductor layer, a first substrate, a first light-emitting surface and a first side wall, a second light-emitting unit, which is arranged on the upper conductive layer, and comprises a second light-emitting surface and a second side wall, a light-transmitting layer arranged on the first surface and covers the upper conductive layer, the first light-emitting unit, and the second light-emitting unit, a light-absorbing layer, which is arranged between the substrate and the light-transmitting layer in a continuous configuration of separating the first light-emitting unit and the second light-emitting unit from each other, and a reflective wall arranged on the first side wall, wherein a height of the reflective wall is lower than that of the light-absorbing layer.