Beveled Side-Emitting LED Package for Uniform High-Brightness Displays
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Solution Overview
Problem
Existing LED displays face challenges in achieving high brightness while avoiding speckling and spotting effects, particularly in environments with high ambient light such as vehicles.
Innovation Solution
A side emitting LED package with a bevel light emitting surface is designed, featuring a substrate, an LED chip, a light converter with inclined outer side surfaces, and a cap that inhibits perpendicular light emission. This configuration collimates light and enhances light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED elements concentrate light directly at additional layers, then brightness is improved, but speckling and spotting effects occur
Solution Approach 1:
A light guide layer is introduced as an intermediary between the LED elements and additional layers. This light guide layer receives concentrated light from LED elements and redistributes it uniformly across the display area, preventing direct concentration of light at additional layers while maintaining high brightness. The light guide layer acts as a mediator that transforms point-source light into distributed illumination.
Solution Approach 2:
The invention transitions from direct vertical light transmission to lateral light distribution through the light guide layer. By introducing this intermediate dimension for light propagation, the system achieves uniform light distribution across the display area while preserving the brightness benefits of concentrated LED emission.
2Object-generated harmful factors
If light is made uniform and diffuse, then speckling effects are avoided, but brightness is reduced
Solution Approach 1:
The light guide layer serves as an intermediary that maintains brightness while achieving uniformity. It receives intense concentrated light from LED elements and redistributes it uniformly across the display area, decoupling the relationship between light concentration and uniformity. This allows the system to achieve both high brightness and uniform light distribution simultaneously.
3Ease of manufacture
If conventional LED structures are used, then manufacturing is simple, but light extraction efficiency is insufficient
Solution Approach 1:
The LED display structure is segmented into distinct functional layers: LED elements layer, light guide layer, and additional layers. This segmentation allows each layer to be optimized for its specific function while maintaining overall manufacturing simplicity. The light guide layer is divided into multiple regions with different optical properties to enhance light extraction efficiency at various locations.
Solution Approach 2:
Different regions of the light guide layer are assigned different optical properties and structures tailored to local requirements. Regions closer to LED elements have properties optimized for light reception and initial distribution, while regions farther away are optimized for uniform light output. This local optimization enhances overall light extraction efficiency without complicating the global manufacturing process.
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 achieves greater brightness for LED displays without speckling or spotting effects, improving light distribution uniformity and optical efficiency, especially in high ambient light conditions.
Implementation Method 1
The outer side surfaces of the light converter can be inclined, so that the light converter is wider at the base, adjacent to the substrate, than at the top, adjacent to the cap. The incline angle can be selected to collimate light emitted from the LED package.
Implementation Method 2
a light converter surrounding the LED chip, wherein the light converter comprises a light converter outer side surface that can be defined by a portion of a second plane, and wherein the second plane intersects the first plane at an inclined angle
Data Source
AI summary
The described technology includes a side emitting light emitting diode (LED) package with a bevel light emitting surface, and LED displays including the disclosed LED packages. The LED package can include a substrate, an LED chip, a light converter, and a cap. The LED chip can be positioned over the substrate, and the light converter can comprise a transparent material also positioned over the substrate and surrounding the LED chip. The cap can be positioned over the light converter to inhibit emission of light perpendicular to the surface of the substrate. The outer side surfaces of the light converter can be inclined, so that the light converter is wider at the base than at the top. The incline angle can be selected to collimate emitted light. LED displays including the disclosed LED packages can include multiple LED packages affixed to a printed circuit board (PCB) along with other components.