OLED Lighting Apparatus with Pyramid Light Extracting Layer
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Solution Overview
Problem
Conventional lighting apparatuses, such as incandescent and fluorescent lamps, have low energy efficiency and poor color rendering index, while LED lamps have inefficient luminance distribution, particularly in red and green wavelength ranges, making them unsuitable for applications requiring concentrated front luminance, like vehicle lighting.
Innovation Solution
A lighting apparatus using an organic light emitting diode (OLED) with an external light extracting layer featuring a four-sided pyramid shape to refract light emitted by the OLED unit, improving front luminance by directing light towards the front side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an organic light emitting diode emits light at various angles, then the luminance is dispersed to both front and side directions, but the front luminance does not reach the desirable reference value
Solution Approach 1:
An external light extracting layer is introduced as an intermediary component between the OLED and the external environment. This layer has a refractive index higher than the OLED and features a four-sided pyramid shape that refracts light emitted by the OLED to concentrate it in the front direction, thereby improving front luminance while maintaining the inherent luminance distribution characteristics of the OLED
Solution Approach 2:
The refractive index parameter of the light extracting layer is specifically optimized to be higher than that of the OLED. Additionally, the geometric parameters of the four-sided pyramid structure are designed with specific angle ranges (40-60 degrees for the side face angle, 60-80 degrees for the apex angle) to control the refraction of light and achieve concentrated front luminance
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 enhances front luminance to 12000 nit, concentrating light on the front surface and improving overall luminance distribution, addressing the inefficiencies of previous technologies.
Implementation Method 1
an external light extracting layer which refracts the light emitted by the organic light emitting diode unit to the normal direction of the organic layer
Data Source
AI summary
A lighting apparatus including an organic light emitting diode includes an organic light emitting diode unit which includes an organic layer disposed on a substrate, wherein the organic light emitting diode emits light with an angle with respect to a normal direction of the organic layer; and an external light extracting layer which refracts the light emitted by the organic light emitting diode unit to the normal direction of the organic layer.