Projector Password Input via Adaptive Character Scaling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing projector technologies face challenges in maintaining password confidentiality while ensuring operability, as uniform password display on large screens compromises secrecy and complete hiding deteriorates input usability.
Innovation Solution
A control method for a projector that adjusts focal length and projection range, using sensors and receiving devices to detect and process control signals from a remote controller, projecting a reduced character size for password input, balancing secrecy and usability by determining the projection surface size and remote controller position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If password is uniformly displayed on large screen, then input operability is improved, but password confidentiality is deteriorated
Solution Approach 1:
The patent applies local quality by displaying the password character at a reduced size only at the specific location where the remote controller is detected, rather than uniformly across the entire projection surface. This allows the password to be visible and operable at the user's location while remaining confidential from other viewpoints.
Solution Approach 2:
The patent introduces a spatial dimension to password visibility by making the character size dependent on the remote controller's position in space. The password character is projected at different sizes based on the angular position detected by the receiving devices, creating a position-dependent visual experience that maintains both operability and confidentiality.
2Loss of information
If password is completely hidden, then password confidentiality is improved, but input operability is deteriorated
Solution Approach 1:
The patent applies partial action by displaying only a portion of the password character (reduced size) at the user's location rather than completely hiding it or displaying it at full size. This partial display provides just enough visibility for the user to input the password while maintaining confidentiality from others.
Solution Approach 2:
The patent makes the password visibility local to the user's position by detecting the remote controller's location and projecting the reduced-size character only in that specific direction, ensuring the password is visible to the user but hidden from others.
3Loss of information
If reduced character size is projected, then password confidentiality is improved, but input operability may be deteriorated
Solution Approach 1:
The patent applies dynamics by making the character size adaptive rather than fixed. The system dynamically adjusts the password character size based on the detected position of the remote controller, ensuring the character is reduced enough for confidentiality but not so small as to prevent the user from seeing and inputting the password.
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
This approach enhances password input operability while maintaining confidentiality by projecting a reduced character size that is only visibly recognizable to the user, thereby improving usability without compromising secrecy.
Implementation Method 1
an optical system for adjusting a focal length and a projection range
Implementation Method 2
a first receiving device and a second receiving device disposed in a position different from a position of the first receiving device in a direction from the projector to the screen, receive a control signal, which is an electromagnetic wave, transmitted from a remote controller
Data Source
AI summary
An image including an input field for a password is projected onto a screen by a projection device including an optical system for adjusting a focal length and projection range. A control signal transmitted from a remote controller is received by at least one of a first receiving device and a second receiving device. A character of the password input to the input field is determined from the control signal by a control circuit. The projection device is controlled to project, according to a combination a size a projection surface in the screen calculated from the focal length and the projection range and a position of the remote controller determined from the control signal, a reduced character obtained by reducing a size of the character to a size smaller than a reference size in the input field.