Smart Mirror Focus Control via Dynamic Lens Array
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Solution Overview
Problem
Users face difficulty in clearly recognizing information displayed on a smart mirror and their own image simultaneously due to a difference in focal lengths between the displayed information and their reflection.
Innovation Solution
An electronic device with a display unit, a reflective layer, and a focus control layer comprising a lens array, where a processor controls the focus based on the distance between the object and the reflective layer using sensors like cameras or ultrasonic sensors to ensure both the reflection and information are in focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a smart mirror combines a display panel and a one-way mirror, then it can show information and reflections simultaneously, but the user cannot clearly recognize both the displayed information and their own image due to different focal lengths
Solution Approach 1:
A focus control layer comprising a lens array is introduced as an intermediary component between the display panel and the reflective layer. This lens array dynamically adjusts the focal length of the displayed image to match the focal length of the reflected image, enabling the user to clearly recognize both simultaneously without physical movement of components.
Solution Approach 2:
The focal length of the displayed image is dynamically changed by applying voltages to the lens array elements. The processor controls the focal length parameter of the display output based on detected user distance, allowing the displayed image to maintain sharp focus at varying viewing distances while the reflection remains naturally focused.
2Reliability
If the display panel shows information at a fixed focal length, then the display function is stable, but the reflected image and displayed information cannot be in focus at the same time when the user distance varies
Solution Approach 1:
The focus control layer transforms the static display system into a dynamic one by introducing a lens array that can change its focal length in real-time based on user distance. The processor continuously adjusts the voltage applied to the lens elements, enabling the display to adapt its focal length dynamically while maintaining stable operation and clear image quality.
Solution Approach 2:
A feedback mechanism is implemented where the processor detects the user's distance from the smart mirror using sensors (such as ultrasonic or optical sensors) and automatically adjusts the focal length of the displayed image accordingly. This closed-loop control ensures that the displayed information remains in focus regardless of the user's viewing distance.
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 allows users to easily recognize both the displayed information and their reflection by adjusting the focal lengths to match, enhancing usability of smart mirror devices.
Implementation Method 1
a focus control layer disposed between the display unit and the reflective layer and comprising a lens array including a plurality of lenses
Data Source
Figure 1A
Figure 1B~1C
Figure 2
AI summary
An electronic device includes a display unit configured to display a plurality images, an eye tracking sensor configured to detect a eye-focused area on the display unit, a reflective layer, a reflective control layer configured to change a regional reflectivity of the reflective layer, and a processor configured to receive the eye-focused area on the display unit from the eye tracking sensor, and determine a focus image within the eye-focused area and an unfocused image out of the eye-focused area, and cause the reflective control layer to reflect the unfocused image. In some embodiment, the processor is configured to cause the reflective control layer not to reflect the focused image.