Laser virtual keyboard

Abstract

A laser virtual keyboard is disclosed in the present invention, mainly comprising a keyboard pattern projection module, light sensor, two electric laser devices and a central processing unit, the two electric laser devices and the light sensor are connected to the central processing unit respectively; the keyboard pattern projection module is arranged in the central position of the upper edge of the display screen, for projecting a pattern of the keyboard to a surface in the front of the display screen; the keyboard pattern imaging method of the present invention has low cost and the image is stabile and clear; when a user uses the present invention to input, the two laser beam emitted by the two electric laser devices irradiated on the user's finger at the same time and forming a reflection, by obtaining the angle between the laser beams emitted by the two electric laser devices, combined with the known space between two electric laser devices, in accordance with the triangulation location algorithm, the location of the user's fingers on the keyboard pattern can be obtained. The algorithm is simple and accurate in location.

Description

technical field [0001] The invention relates to a laser virtual keyboard, which is suitable for portable digital products such as mobile phones and tablet computers with virtual laser keyboards. Background technique [0002] At present, the keyboards of products such as tablet computers, mobile phones, MP4s, and handheld computers are generally displayed on the liquid crystal screen, and the corresponding input work is completed by touching the touch screen on the top of the liquid crystal screen. When in use, the display screen must be constantly touched. Due to the limited area of ​​the display screen, the displayed keyboard area is relatively small, and the display area of ​​other content is also greatly reduced, which is very inconvenient to use. If the touch screen is not used, an external physical keyboard is required as an input device, which is inconvenient to carry and use. [0003] Therefore, the industry produces a laser virtual keyboard to solve the above-mentio...

AI Technical Summary

Problems solved by technology

When using it, you have to constantly touch the display screen. Due to the limited area of ​​the display screen, the displayed keyboard area is relatively small, and the display area of ​​other content is also greatly reduced, which is very inconvenient to use.

If you don’t want to use the touch screen, you need an external physical keyboard as an input device, which is very inconvenient to carry and use

[0003] Therefore, the industry produces a laser virtual keyboard to solve the above-mentioned shortcomings. This laser virtual keyboard mainly includes a scanning sensing device, including first and second laser emitters, and the first laser emitter is arranged on the scanning sensing device. The high end is used to emit a visible laser beam for surface scanning to generate the pattern of the keyboard, and when the user uses the keyboard to input, a first reflected beam is generated; the second laser emitter is arranged on the first laser emitter The lower part of the laser emitter is used to emit a parallel invisible laser beam, which is parallel to the keyboard pattern in a line-scanning manner, and the angular velocity of the line-scanning is the same as that of the first laser emitter, so that it is easier for the user to use the keyboard. When inputting, a second reflected beam is generated; a laser receiver is arranged between the first and second laser transmitters, and when the user uses the keyboard to input, the first and second reflected beams are received, thereby being used The above-mentioned first laser transmitter is actually a laser micro-projector. Its principle is that a laser beam scans vertically and horizontally on a surface at high speed, similar to the electron gun of a TV. By controlling the brightness and darkness of the laser beam, the scanning Patterns are formed on the surface. This method requires a very complicated mirror. A fixed laser beam is shot on the mirror. By controlling the flip of the mirror and changing the incident angle, the outgoing laser forms a scanning line. This method is similar to that of the United States. MICROVISION's laser micro-projection is very technically difficult to implement. MICROVISION has been researching in this direction for more than ten years, and it is not mass-produced yet. The biggest difficulty lies in producing a precise scanning line, which requires precise control of the Reflector

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