LED Display Light Dispersion Layer for Emission Area Expansion
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Solution Overview
Problem
Display apparatuses using light-emitting diodes (LEDs) typically have small light-emitting areas, leading to deteriorated display quality due to limited emission areas.
Innovation Solution
The display apparatus incorporates a substrate with a light-emitting diode, a pixel separating layer, and a light dispersion layer, optionally including an inorganic layer and a lens, to enhance the emission area and improve light distribution, with the pixel separating layer and light dispersion layer designed to absorb, scatter, or reflect light to prevent crosstalk and increase brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a light-emitting diode with a small emission portion is used, then the device complexity is reduced, but the light-emitting area is limited leading to deteriorated display quality
Solution Approach 1:
The patent introduces optical elements (lens and light dispersion layer) that manipulate light in three-dimensional space. The lens focuses and expands light from the small LED emission area, while the light dispersion layer distributes light laterally, effectively increasing the perceived light-emitting area without enlarging the LED chip itself.
Solution Approach 2:
The patent employs intermediate optical components (lens and light dispersion layer) positioned between the LED and the display surface. These intermediaries transform the light from the small LED emission area into a larger, more uniformly distributed light field, resolving the contradiction between small LED size and large light-emitting area.
2Reliability
If the pixel separating layer is made taller to prevent crosstalk, then light isolation is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent uses the light dispersion layer to convert potentially harmful light leakage (crosstalk) into beneficial lateral light distribution. The light-scattering particles in the dispersion layer redirect light that would otherwise cause crosstalk, distributing it across the pixel area to enhance uniformity while maintaining isolation.
3Illumination intensity
If a light dispersion layer with light-scattering materials is added, then light distribution is improved, but the device complexity increases
Solution Approach 1:
The light dispersion layer is applied locally over each pixel area with specific optical properties. The light-scattering particles are distributed within the layer to create localized light redistribution zones that enhance uniformity without requiring complex global structural changes.
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 solution effectively enlarges the emission area and enhances display quality by optimizing light extraction and reducing external light reflection, resulting in improved brightness and color accuracy.
Implementation Method 1
a light dispersion layer arranged on the light-emitting diode and the pixel separating layer
Implementation Method 2
a lens arranged between the inorganic layer and the light dispersion layer, where the lens covers the light-emitting diode
Implementation Method 3
the pixel separating layer may include a material capable of absorbing at least a portion of light
Implementation Method 4
an inorganic layer between the light-emitting diode and the light dispersion layer, where the inorganic layer covers the light-emitting diode
Data Source
AI summary
A display apparatus includes a substrate; a light-emitting diode on the substrate; a pixel separating layer surrounding the light-emitting diode; and a light dispersion layer on the light-emitting diode and the pixel separating layer.