Two-Stage Switch Control for Display Device Projection Safety
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Solution Overview
Problem
Conventional display devices lack a mechanism to prevent people from entering the video projection area and inadvertently activating the device during transport, leading to potential discomfort and unnecessary battery consumption.
Innovation Solution
A display device with a two-stage switch control system that prevents light source activation until a predetermined period has passed, accompanied by a detection mechanism and guidance displays to ensure the area is clear, and a hood to prevent direct light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a single-stage switch control is used for simplicity, then the ease of operation is improved, but the safety against accidental activation and person exposure deteriorates
Solution Approach 1:
The switch control function is segmented into two independent switches: a first switch for initial activation and a second switch for light source turn-on. This segmentation prevents accidental activation by requiring deliberate two-step operation, while maintaining ease of use through clear separation of functions.
Solution Approach 2:
The first switch performs a preliminary action by activating the display device without immediately turning on the light source. This preliminary step allows the system to initialize and prepare, creating a time buffer that prevents accidental exposure while keeping the operation sequence simple and intuitive.
2Productivity
If the light source is turned on immediately for quick activation, then the productivity is improved, but the risk of person exposure and discomfort increases
Solution Approach 1:
The system performs preliminary initialization actions when the first switch is pressed, preparing the display device without immediately activating the light source. This preliminary phase maintains quick activation overall while inserting a safety buffer that prevents immediate person exposure.
Solution Approach 2:
The two-stage switch control creates a periodic action pattern where the light source is activated only after a specific time interval following the first switch press. This timing-based control ensures the system is ready while preventing premature exposure, balancing speed and safety.
3Device complexity
If no detection mechanism is provided for person entry, then the device complexity is reduced, but the ability to prevent harmful exposure deteriorates
Solution Approach 1:
The two-stage switch control performs a preliminary safety check by requiring deliberate activation steps before the light source turns on. This built-in time delay and confirmation mechanism serves as a preventive measure without requiring complex external detection systems.
Solution Approach 2:
The first switch acts as an intermediary between the user and the light source activation. It mediates the activation process by initiating device startup without immediately enabling the light source, providing a safety buffer that prevents accidental exposure without complex detection hardware.
4Ease of operation
If the switch is easily accessible for convenient operation, then the ease of operation is improved, but the risk of inadvertent activation during transport increases
Solution Approach 1:
The control function is segmented across two switches, so even if one switch is inadvertently pressed during transport, the light source cannot activate without the second switch operation. This functional segmentation maintains accessibility while improving reliability through required multi-step activation.
Solution Approach 2:
The first switch performs a preliminary activation that prepares the device but does not immediately enable the light source. This preliminary state requires a second deliberate action for full activation, preventing transport-related accidental activation while keeping both switches easily accessible for normal use.
Data Source
AI summary
A display device (100) of the present invention has a first switch (3) and a second switch (4) on an upper surface of its casing, and includes a control circuit (18) for controlling the first switch (3) and the second switch (4) and a light source (19) inside the casing. The control circuit (18) performs control so that the light source (19) is turned on when the second switch (4) is pressed after a predetermined period of time has passed from when the first switch (3) was pressed. Thereby, the display device (100) of the present invention prevents entering of a person into a projection area before projection of video, and controls inadvertent start-up.