Pure flat multi-touch detection system based on frustrated total internal reflection technology
Summary:
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The invention relates to a pure flat multi-touch detection system based on frustrated total internal reflection technology, which comprises a transparent substrate polished at an angle on the upper and lower surfaces and sides for transmitting light of a specific wavelength; comprising one or more a light source having a certain emission angle, the light source being coupled to a side of the transparent substrate polished at an angle; the angle causing the light source to emit a specific wavelength of light at a desired timing in the transparent substrate Total internal reflection propagating at a specific angular range, and light transmitted at different angles is transmitted through the transparent substrate and detected by one or more light sensing devices coupled to other sides of the transparent substrate, and the light sensing device passes Detecting the attenuation of the propagating optical signal due to suppression is used to locate the position of one or any of a plurality of contact points on the upper surface of the transparent substrate. The invention realizes high precision, low cost based on physical real multi-point, simple structure and easy installation.
text:
A flat-screen multi-touch detection system based on frustrated total internal reflection technology, comprising: a transparent substrate for conducting total internal reflection therein, the transparent substrate being provided with an upper surface and a lower surface a surface and respective sides; one or more light sources disposed on respective sides of the transparent substrate for conducting optical signals to the transparent substrate at a desired timing to form a total internal reflection transmission; one or more lights a sensing device, the light sensing device is coupled to each side of the transparent substrate for detecting an optical signal that is transmitted through the transparent substrate and is escaping from the transparent substrate Attenuating the attenuation of the optical signal to position one or more contact locations of the surface of the transparent substrate; an information processing system for locating the position of one or more contact points on the upper surface of the transparent substrate by calculating the transmitted optical signal The information processing system communicates with the light source and the light sensing device via one or more signal lines.
The light sensing device is coupled to the opposite side and the adjacent side of the side of the light source coupled to the side of the light source, and the light source and the light sensing device are disposed in pairs.
The sides of the transparent substrate are polished edges that are polished at an angle that is the minimum angle of incidence, ie, the critical angle, that causes the optical signal to form total internal reflection within the substrate.
The light source and the light sensing device are disposed on a lower surface of the transparent substrate and form an angle with a lower surface of the transparent substrate, the angle being a minimum incident angle, that is, a critical angle. The flat-screen multi-touch detection system according to claim 3 or 4, wherein the critical angle θc is calculated as: where n2 is the refractive index of the lower density medium and n1 is the refraction of the higher density medium rate.
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