AR Display Optics With Light-Based Touch Sensing Reliability
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Solution Overview
Problem
Existing augmented reality devices face challenges in accurately sensing user touches and preventing interface malfunctions, which affect the reliability and efficiency of user interactions.
Innovation Solution
A display device that uses display light to sense user touches by analyzing changes in light amounts through reflective members with light-receiving sensing parts, allowing real-time touch sensing and interface activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch sensing is implemented using display light in AR devices, then user interface functionality is improved, but touch sensing accuracy deteriorates due to light amount changes on the optical path
Solution Approach 1:
A separate illumination unit is introduced as an intermediary component to provide dedicated sensing light, independent of the display light. This mediator allows touch sensing to occur without interfering with the display function, resolving the contradiction between enabling UI functionality and maintaining sensing accuracy by separating the light sources.
2Adaptability or versatility
If light-receiving sensors are placed on reflective members, then touch sensing capability is improved, but device complexity increases due to additional sensing components
Solution Approach 1:
The reflective member is designed to serve dual functions: reflecting display light for image formation and providing a platform for light-receiving sensors to detect touch input. By making the reflective member multi-functional, the patent adds touch sensing capability without proportionally increasing device complexity, as the same structural element performs multiple roles.
3Device complexity
If display light is used for both display and touch sensing, then device simplicity is improved, but touch sensing reliability deteriorates due to interface malfunctions
Solution Approach 1:
The lighting function is segmented into two separate systems: display light from the display unit and sensing light from a dedicated illumination unit. This segmentation allows each light source to be optimized for its specific purpose, preventing the interference and malfunctions that occur when a single light source must serve both functions, thereby improving reliability.
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
Enables accurate and efficient user interface functions by preventing touch sensing errors and malfunctions, enhancing user reliability and interaction capabilities.
Implementation Method 1
a first reflective member that reflects the display light for the image displayed in the display part to supply the display light to the transparent lens
Implementation Method 2
senses a change in an amount of light on the path of the display light caused by a user's touch to output light amount detection signals
Data Source
AI summary
A display device for providing includes a display part outputting display light for displaying an image, an optical part forming a path of the display light so that the image is displayed on a transparent lens, and sensing a change in the amount of light according to a user's touch on the path of the display light outputting light amount detection signals, and a controller analyzing changes in the magnitude of the light amount detection signals to sense the user's touch, and activating a user interface function based on sensing results.