Dual-Direction Light Projection Device for Foldable Screens
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Solution Overview
Problem
Conventional light projection devices in electronic devices can only project light in one direction, making them unsuitable for double-sided screen devices like folding screen mobile phones that require light projection in two directions for facial recognition on both screens.
Innovation Solution
A light projection device with a lens module and a light source module that includes a semi-reflective and two total reflective sheets, along with diffractive optical elements, allowing light to be projected in two opposite directions by utilizing a single light source, enabling facial recognition on both screens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional light projection device is used, then the device structure is simple, but it can only project light in one direction and cannot achieve facial recognition on both screens
Solution Approach 1:
The optical path is segmented into multiple independent paths using beam splitters and mirrors. The light from a single source is divided into separate beams that travel along different paths to reach different screens, enabling multi-directional projection without requiring multiple light sources
Solution Approach 2:
Beam splitters and mirrors are introduced as intermediary optical elements to redirect light between different paths. These intermediaries enable the light to be redirected towards both front and back screens while maintaining a compact structure within the device housing
2Adaptability or versatility
If multiple light sources are used to project light in two directions, then light projection in multiple directions is achieved, but the device complexity and space occupation increase
Solution Approach 1:
A single light source is designed to serve multiple functions by projecting light in multiple directions simultaneously. The light source acts as a universal source for both front screen and back screen projection, eliminating the need for separate light sources for each direction
Solution Approach 2:
Multiple optical paths are merged into a single integrated system sharing one light source. The optical components are arranged to combine the light paths from the single source to reach both screens, reducing the total number of components while achieving multi-directional projection
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 device effectively projects light in two directions, enabling facial recognition on both screens of a dual-screen electronic device using a single light source module, enhancing the functionality of conventional light projection systems.
Implementation Method 1
The light incident on the light-incident surface is reflected by the light-incident surface to the semi-reflective sheet
Implementation Method 2
the other portion of the light passes through the semi-reflective sheet
Implementation Method 3
the other two reflective sheets are sheets which are totally reflective... the light is reflected by the second light-emitting surface
Implementation Method 4
one of the diffractive optical elements is positioned on a light-emitting path of the first light-emitting surface, and the other one is positioned on a light-emitting path of the second light-emitting surface
Data Source
AI summary
A single light projection device providing illumination in two opposing directions includes a lens module and a light source module. The lens module includes a light-incident surface, a first light-emitting surface, and a second light-emitting surface. The light source module includes a light source configured for emitting light toward the light-incident surface. The first light-emitting surface and the second light-emitting surface introduce the light from the light source module outside of the light projection device in two different and opposing directions.