Light Emitting Device With Tilted Insulation for Color Purity
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Solution Overview
Problem
Wearable display devices face challenges in maintaining display quality due to reduced size or weight, affecting view angle characteristics and light extraction efficiency.
Innovation Solution
A light emitting device with a structure that includes a plurality of sub-pixels, each comprising an organic layer, a first and second insulating film, and a color filter, where the upper surface of the second insulating film tilts with respect to its lower surface, allowing for controlled light emission direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the size or weight of the display device is reduced, then the device becomes more compact and lightweight, but the view angle characteristic and light extraction efficiency deteriorate
Solution Approach 1:
The patent applies local quality by tilting the second insulating film only in specific regions (e.g., in the center of the sub-pixel or in color filter regions) rather than uniformly across the entire device. This localized tilting adjusts light emission characteristics for each sub-pixel independently, improving view angle characteristics without increasing overall device size or weight.
Solution Approach 2:
The patent introduces a dimensional change by tilting the second insulating film from a horizontal plane to an inclined plane. This creates a third dimension (vertical inclination) that controls light emission direction. By utilizing this angular dimension, the device can improve light extraction efficiency and view angle characteristics without increasing the horizontal footprint or weight of the device.
2Weight of moving object
If the size or weight of the display device is reduced, then the device becomes more compact and lightweight, but the view angle characteristic and light extraction efficiency deteriorate
Solution Approach 1:
The patent applies local quality by tilting the second insulating film only in specific regions (e.g., in the center of the sub-pixel or in color filter regions) rather than uniformly across the entire device. This localized tilting adjusts light emission characteristics for each sub-pixel independently, improving view angle characteristics without increasing overall device size or weight.
Solution Approach 2:
The patent introduces a dimensional change by tilting the second insulating film from a horizontal plane to an inclined plane. This creates a third dimension (vertical inclination) that controls light emission direction. By utilizing this angular dimension, the device can improve light extraction efficiency and view angle characteristics without increasing the horizontal footprint or weight of the device.
3Ease of manufacture
If the upper surface of the second insulating film is made horizontal, then the manufacturing process is simple, but light emission control and display quality are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the inclination angle of the second insulating film. By controlling the tilt angle (e.g., 0° to 15° relative to the horizontal direction), the device can precisely control light emission direction. This parameter adjustment allows optimization of light extraction efficiency and view angle characteristics while maintaining manufacturing feasibility through standard deposition techniques.
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 tilted structure enhances light emission control, improving display quality by adjusting light distribution and reducing color mixture between adjacent sub-pixels.
Implementation Method 1
an upper surface of the second insulating film tilts with respect to a lower surface of the second insulating film
Data Source
AI summary
A light emitting device includes a light emitting region in which a plurality of sub-pixels are two-dimensionally arranged. Each of the plurality of sub-pixels includes an organic layer including a light emitting layer, a first insulating film arranged on the organic layer, a second insulating film arranged on the first insulating film, and a color filter arranged on the second insulating film. On a cross section passing through the first insulating film, the second insulating film, and the color filter, an upper surface of the second insulating film tilts with respect to a lower surface of the second insulating film.