Laser optical contact module

Abstract

The invention discloses a laser optical contact module, which is arranged on one side of the surface of the display screen to provide an optical positioning input function for constructing an optical control display screen system. A light emitting part of a laser source and the light receiving part of a position sensor (camera) are combined together, so that a laser source and the position sensor are arranged and used at the same position on the same side of the surface of the display screen; and the light emitting part emits a laser beam through the laser source, the light beam is reflected by an optical element for acquiring a wide angle, such as a line generatoroptics, the light fan of the reflected laser beam can be more than 90 DEG C, and thus, a wide-angle liner light beam can be formed on the surface of the display screen. The light receiving part receives and senses the laser beam reflected by the contact control element in the linear light beam through the position sensor, so as to sense the relative position of the contact control element.

Description

technical field [0001] The present invention relates to an optical touch module, in particular to a light-emitting part using a laser light source and a light-receiving part with a position sensor, and the optical paths between the light-emitting part and the light-receiving part are parallel optical paths Or a common optical path to form a module. Background technique [0002] The currently popular touch-screen displays use touch elements such as fingers or stylus to directly touch the surface of the display to control various functions of the display, such as clicking operations, switching screens, or zooming in / out. It replaces the common button control method of general displays; and the current touch display screen already includes a variety of different touch systems, such as resistive (Resistive), capacitive (Capacitive), surface acoustic wave (SAW, Surface Acoustic Wave) ), infrared light (IR, Infrared), optical imaging, etc., each has its own advantages and disadva...

AI Technical Summary

Problems solved by technology

[0004] Existing general optical touch systems mostly adopt light-emitting diode (LED, light-emitting diode) as the light source in the design, but LED light is not a highly coherent light source, so it cannot effectively improve the touch sensitivity; The existing LED light source device and the position sensor (camera) used are separate entities, and are respectively arranged at a certain position on the four edges (frame edge) of the display screen surface, and the overall structure must be equipped with reflective strips Or the use of light-absorbing strips, so that it has disadvantages such as complex structure and increased cost. In particular, the illumination light provided by the LED light source device is generally visible light, which is easily interfered or affected by the visible light in the use environment and the visible light generated by the display screen. The sensing sensitivity of the position sensor in the optical touch system is reduced, that is, the signal-to-noise ratio (SNR) is reduced, which relatively affects the interpretation of the signal, thereby reducing the efficiency of the optical touch system

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