An optical touch-sensitive device detects touch events caused by objects (e.g., pens, styluses, fingers) and determines a touch type for the touch event based on analyzing a deformation wave caused by the touch event.

A touch-sensitive aparatus operates by light frustration (FTIR) and comprises a light transmissive panel (1) with a front surface (5) and a rear surface (6). Light emitters (2) are optically coupled to the panel (1) at entry ports along a periphery region of the panel (1), and light detectors (3) are optically coupled to the panel (1) at exit ports along the periphery region for detecting light transmitted inside the panel (1). At least one optical sheet (20) is provided on the rear surface (6) in the periphery region. In an outcoupling installation, the light detectors (3) are arranged at the respective optical sheet (20) to receive, on a respective light-sensitive surface (3A); light from the optical sheet (20), and each light detector (3) is arranged with the light-sensitive surface (3A) essentially perpendicular to the rear surface (6). In an incoupling installation, each light emitter (2) is arranged at the respective optical sheet (20) to emit diverging light with a main direction that is essentially parallel to the rear surface (6) such that a portion of the diverging light impinges on the optical sheet (20) so as to define a respective entry port.

Examples are directed to detect screen contact using total internal reflection. One example involves detecting contact on a screen, the screen comprising total internal reflection of light; and determining, via at least one processor, a location of the contact on the screen based on a disturbance of the total internal reflection, the disturbance caused by the detected contact.

An electromagnetic touch panel includes a total-reflection light guiding plate and a side frame surrounding the total-reflection light guiding plate. The side frame includes a first side frame, a second side frame opposite to the first side frame, a third side frame, and a fourth side frame opposite to the third side frame. The first side frame and the second side frame are respectively configured with a plurality of first infrared (IR) emitters and a plurality of first IR receivers, and the third side frame and the fourth side frame are respectively configured with a plurality of second IR emitters and a plurality of second IR receivers. Polarized directions of IR rays emitted from the first IR emitters and the second IR emitters are different.

The present invention relates to an optical touch-sensitive device and a method of determining a position and determining a position change of an object contacting an optical touch sensitive device. In particular, the present invention relates to an optical touch pad and a method of determining a position and determining a position change of an object contacting an optical touch pad. A touch-sensitive device, according to the present invention may comprise a light source, a touch-sensitive waveguide, a detector array, and a first light redirecting member, wherein at least a part of the light propagating towards a specific point of the detector array is prevented from being incident upon the specific point of the detector array when an object contacts a touch-sensitive surface of the touch-sensitive waveguide at a corresponding specific contact point.

A grating touch screen based on lattice structure distribution comprises a laser light source, an optical waveguide layer, a grating and a photoelectric detector. In the present invention, the grating with the lattice structure distribution is reasonably arranged on the optical waveguide layer, so that the efficiency of detection light from the laser light source reaching the photoelectric detector at a periphery through the grating touch screen is maximized, and the sensitivity of the touch screen is effectively improved.

Disclosed herein is a display apparatus including a curved display module having a curved surface bent in a y-axis direction, a surface overlay disposed on the front surface of the curved display module and having a refractive index differing from an air layer, at least one IR emitter arranged on the upper long side or the lower long side of the surface overlay and emitting IR light, and at least one first IR receiver arranged on the long side opposite the at least one first IR emitter and receiving the IR light emitted by the at least one IR emitter. The curved display apparatus may more accurately and effectively recognize touch input and thus, user convenience may be improved.

An optical apparatus includes a touch substrate; a waveguide layer arranged on the touch substrate, the waveguide layer including a plurality of waveguides; an optical output structure arranged on the waveguide layer and configured to output light propagating in the plurality of waveguides at touched locations on the touch substrate; a gap layer arranged to provide a predetermined gap between the waveguide layer and the optical output structure; and an optical system, which projects light output by the optical output structure.

A flat illuminator having substantially reduced or no diffractive artifacts may be realized by using a partially reflective, embedded layer of extraction features, such as partially reflective facets or partially reflective bumpy surface, buried with substantially matching refractive index on both sides of layer. Implementations may be used in creating infrared (IR) illumination, either as a frontlight unit (FLU) or backlight unit (BLU), as well as for supporting a floating image of IR illumination in a retroreflective, reconvergent imaging or a retroimaging application.

Invention principally regards a remotely controllable touch-sensing apparatus. The apparatus comprises a planar light guide, a plurality of light emitters arranged to emit light into the light guide for propagation by total internal reflection inside the light guide, and a plurality of light detectors, each being arranged to detect at least a portion of the emitted light propagating inside the light guide and at least a portion of the ambient light, said detectors being distributed along the periphery of the touch surface such that the optical plane of detection of light coincides with the plane of the light guide, at least one of said detectors being adapted to detect light emitted by an external device configured to emit light. The apparatus also comprises a processor unit configured to, ultimately, generate a digital signal containing data regarding light generated by the external device. Invention also regards a method for enabling control of a touch-sensing apparatus by an external device.