Rotatable Transmissive Display for Mobile Terminal Audio Visibility
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Solution Overview
Problem
There is a lack of effective solutions for displaying information on a transmissive display unit while audio is being output in mobile terminals, as existing technologies have not fully explored this functionality.
Innovation Solution
A mobile terminal design where the transmissive display unit is positioned in a plane intersecting the principal face of the casing during audio output, allowing easy visibility when the device is held against the ear, utilizing a hinge mechanism and light guide units with hologram gratings or reflective faces to guide image light to the user's eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the transmissive display unit is positioned on the front face of the casing, then the display is visible during audio output, but the display blocks the user's view of the surrounding environment
Solution Approach 1:
The display unit is rotated from a planar position on the front face to an extended position that forms an angle with the front face, specifically positioned in a plane intersecting the front face. This dimensional change allows the display to be visible to the user's eye while not completely blocking the view of the surrounding environment, as the display is angled rather than flat against the front surface.
2Loss of information
If the transmissive display unit is extended to be visible during audio output, then the user can see the display while listening, but the device structure becomes more complex
Solution Approach 1:
The display unit is made rotatable relative to the casing, allowing it to dynamically change its position between a retracted state (when not in use) and an extended state (when audio output is active). This dynamic mechanism enables the display to be positioned as needed without permanently increasing the device's footprint or structural complexity.
3Ease of operation
If the display unit is positioned in a plane intersecting the principal face, then the display is visible at an easy-to-see position, but the positioning mechanism becomes more complex
Solution Approach 1:
The display unit is made rotatable relative to the casing, allowing it to dynamically change its position between a retracted state (when not in use) and an extended state (when audio output is active). This dynamic mechanism enables the display to be positioned as needed without permanently increasing the device's footprint or structural complexity.
Solution Approach 2:
The rotation mechanism is designed to be automatically controlled by the control unit based on the audio output state. When audio output is detected, the display unit automatically rotates to the extended position; when audio output stops, it automatically returns to the retracted position. This self-service mechanism reduces the need for manual intervention and simplifies the overall control structure.
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 users to conveniently view the display on the transmissive display unit while listening to audio, maintaining visibility and usability during phone calls or other audio output scenarios.
Implementation Method 1
a light guide unit having a light entrance into which image light emitted by the display element is incident and a light exit from which a light beam advancing along the optical axis exits, and a first hologram grating provided at the light entrance of the light guide unit and diffracting the image light incident on the light entrance
Implementation Method 2
a first hologram grating provided at the light entrance of the light guide unit and diffracting the image light incident on the light entrance
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
There is provided a mobile terminal including a casing that includes an audio output unit that outputs audio, and a transmissive display unit provided rotatable about the casing. The transmissive display unit is disposable in a plane intersecting a principal face of the casing while the audio output unit is outputting audio.