Laser projection virtual keyboard system achieved by diffractive optical elements and operation method

Abstract

The invention discloses a laser projection virtual keyboard system achieved by diffractive optical elements. The laser projection virtual keyboard system comprises a visible light laser, a virtual keyboard diffractive optical element, an infrared light laser, a horizontal straight line diffractive optical element, an image acquisition unit and a data processing unit; the visible light laser is arranged on an application system device, and a light beam emitted by the visible light laser projects a virtual keyboard on a receiving plane by the virtual keyboard diffractive optical element; the infrared light laser is arranged on the application system device, a light beam emitted by the infrared light laser forms a sector light field with a certain divergence angle by the horizontal straight line diffractive optical element, the sector light field is in parallel to a keyboard light field projection plane, and the sector infrared light field covers an integral keyboard area; and the infrared light image acquisition unit is arranged on the application system device, and an induction area of the infrared light image acquisition unit covers the integral keyboard area. The laser projection virtual keyboard system is small in volume of an optical structure and high in utilization rate of the light field, and a projected keyboard is clear and uniform and can well capture a keyboard input behavior of a user.

Description

technical field [0001] The invention belongs to the technical field of photoelectric communication, and in particular relates to a laser projection virtual keyboard system realized by diffractive optical elements and an operation method thereof. Background technique [0002] At present, the keyboards of portable digital products such as mobile phones, tablet computers, and handheld computers are generally displayed on the display screen, and the corresponding input work is completed through the touch screen. Due to the limited area of ​​the display screen, the displayed keyboard is relatively small, and the display area of ​​other contents is also greatly reduced. If you want to connect an external physical keyboard to realize the input work, it is extremely inconvenient to carry and use. [0003] Therefore, a kind of virtual keyboard is produced in the industry. This kind of keyboard forms a keyboard on a plane by projecting a keyboard pattern sheet through a light beam. T...

AI Technical Summary

Problems solved by technology

In order to obtain clear keyboard fonts, the energy of the beam must be increased. Compared with portable digital products, this loss is quite large

In addition, the invisible light is a fan shape scanned by the laser beam through the vibrating mirror. This structure is large in size, and the portable product is added with a precise mechanical structure and is easily damaged.

Images