Optical Sensing Reflector Structure for Clear AR Projection Films
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Solution Overview
Problem
Transparent projection films used in augmented and mixed reality systems suffer from light diffusion and reduced image contrast due to ambient light, leading to blurry images and decreased visibility.
Innovation Solution
An optical sensing structure with a specific reflector design and optical sensing elements that reduce light diffusion by reflecting light onto a sensing surface, enhancing ambient light intensity sensing and adjusting projection light based on sensed light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transparent projection film is used to combine real scenes with digital images, then augmented reality and mixed reality applications are enabled, but light diffusion occurs causing blurry images and reduced visibility
Solution Approach 1:
The projection film is divided into multiple functional layers: a transparent substrate layer, a light guiding layer with light guiding structures, and a reflective layer with reflective structures. Each layer performs a specific function to collectively solve the light diffusion problem while maintaining transparency for AR applications.
Solution Approach 2:
Light guiding structures and reflective structures are introduced as intermediary elements between the projected light and the ambient environment. These structures mediate light interaction by guiding and reflecting light in specific directions, preventing unwanted diffusion while maintaining image clarity and film transparency.
2Illumination intensity
If transparent projection film is used for imaging, then digital images can be projected, but images are vulnerable to ambient light causing decreased contrast and visibility
Solution Approach 1:
The reflective layer converts harmful ambient light into beneficial reflected light that enhances image visibility. By reflecting ambient light in controlled directions, the harmful factor (ambient light causing low contrast) is transformed into a benefit (enhanced image brightness and contrast through selective reflection).
Solution Approach 2:
The light guiding structures create a feedback mechanism where projected light is guided and reflected back through the film, reinforcing the projected image intensity. This optical feedback loop compensates for ambient light interference by continuously directing projection light through the same path, enhancing contrast and visibility.
3Manufacturing precision
If light guiding structures and reflective structures are added to reduce light diffusion, then image clarity is improved, but device complexity increases
Solution Approach 1:
Multiple functional layers (substrate, light guiding layer, reflective layer) are merged into a single integrated film structure. The light guiding structures and reflective structures are combined in a stacked configuration, allowing multiple functions (light guidance, reflection, transparency) to be achieved within one unified component rather than separate systems.
Solution Approach 2:
The transparent projection film is designed as a multi-functional structure that simultaneously provides transparency for AR viewing, light guidance to control diffusion, reflection to enhance contrast, and structural support. This universal design eliminates the need for separate components for each function, reducing overall system complexity despite the advanced functionality.
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 improves image clarity and visibility by reducing light diffusion and enhancing contrast in transparent projection films, ensuring clear imaging even in varying ambient light conditions.
Implementation Method 1
The optical sensing element has a sensing surface configured to sense ambient light intensity
Implementation Method 2
The at least one first reflector has a first front surface, a first back surface and a first outer lateral surface... reflecting light onto a sensing surface
Data Source
AI summary
An optical sensing structure includes an optical sensing element and at least one first reflector. The optical sensing element has a sensing surface configured to sense ambient light intensity. The first reflector is located at a side of the optical sensing element. The first reflector has a first front surface located over the sensing surface, a first back surface facing away from the first front surface and a first outer lateral surface located between the first front surface and the first back surface. When a length of the first front surface along a first direction is a_1, a length of the first back surface along the first direction is b_1, and an angle between the first outer lateral surface and the first back surface is θ_1, the following conditions are satisfied: 0<a_1/b_1≤0.6 and 25 degrees≤θ_1≤65 degrees.