Light-Emitting Device with Reflective Openings for Microdisplay Concentration
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Solution Overview
Problem
Existing microdisplays used as panel light sources in augmented reality headsets or small projectors suffer from low light utilization efficiency due to pixel pitch restrictions, which prevent effective light concentration using conventional light concentrating structures.
Innovation Solution
A light-emitting device design that covers the surface light source with a reflective film having openings and incorporates a reflecting structure to redirect light output in a predetermined direction, transforming the surface light source into a point light source, enhancing light concentration and utilization efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a surface light source is used in a microdisplay, then the display area can be increased, but light utilization efficiency deteriorates due to inability to concentrate light effectively
Solution Approach 1:
The light reflective film is segmented with multiple openings instead of being continuous, allowing selective light extraction. This segmentation enables the surface light source to be treated as multiple point light sources, facilitating effective light concentration while maintaining display area.
Solution Approach 2:
A light reflective film with openings is introduced as an intermediary between the surface light source and the reflecting structure. This intermediary transforms the surface light source into point light sources and directs light to the reflecting structure, enabling effective light concentration and improving light utilization efficiency.
2Illumination intensity
If conventional light concentrating structures are used, then light can be focused, but pixel pitch restrictions prevent effective implementation in microdisplays
Solution Approach 1:
The invention transitions from conventional two-dimensional light concentrating structures to a three-dimensional configuration using a reflecting structure with light reflecting surfaces positioned at specific heights and angles. This dimensional change enables effective light concentration within the limited pixel pitch of microdisplays.
Solution Approach 2:
The invention changes the geometric parameters of the light concentrating structure by using a reflecting structure with specific height, opening size, and light reflecting surface angles. These parameter adjustments enable effective light concentration while accommodating the pixel pitch restrictions of microdisplays.
3Loss of energy
If the light reflective film covers the entire surface, then light extraction is improved, but light concentration capability deteriorates
Solution Approach 1:
The light reflective film is segmented with multiple openings instead of being continuous, allowing selective light extraction. This segmentation enables the surface light source to be treated as multiple point light sources, facilitating effective light concentration while maintaining display area.
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 design significantly improves light concentration and utilization efficiency, particularly in microdisplays with pixel pitch restrictions, by effectively redirecting and focusing light from the surface light source into a desired direction.
Implementation Method 1
a light reflective film that covers a surface of the light source section and has one or more openings on a light outputting surface of the light source section
Implementation Method 2
a reflecting structure that is provided on side of the light outputting surface of the light source section and has one or more light reflecting surfaces around the one or more openings, the one or more light reflecting surfaces reflecting light outputted from the one or more openings in a predetermined direction
Data Source
AI summary
A light-emitting device of one embodiment of the present disclosure includes: a light source section including a surface light source; a light reflective film that covers a surface of the light source section and has one or more openings on a light outputting surface of the light source section; and a reflecting structure that is provided on side of the light outputting surface of the light source section and has one or more light reflecting surfaces around the one or more openings, the one or more light reflecting surfaces reflecting light outputted from the one or more openings in a predetermined direction.