A light source device including a light source module and an adjusting mechanism is provided. The light source module includes a base, a first light source and at least two second light sources. The first light source is disposed on the base and adapted to emit an invisible light curtain, wherein the invisible light curtain ranges over a display plane. The second light sources are disposed on the base and adapted to emit a first visible light beam and a second visible light beam respectively, wherein the first visible light beam is parallel to the invisible light curtain and the second visible light beam is parallel to the invisible light curtain. The adjusting mechanism is disposed on the base and used to adjust relative positions of the base and the display plane. In addition, an adjusting method of the light source device is also provided.

A secure computer keyboard system utilizes a mobile device in conjunction with a keyboard device to provide secure keyboard entry in a public place. An application on the mobile device produces a mapping of characters to character codings, and displays to the user a key such as a modified keyboard showing the mapping. The keyboard device receives input keystrokes from the user representing the codings and transmits the keystrokes back to the mobile device or to a server. The mobile device or server decodes the keystrokes using the mapping.

A touch detection apparatus including a first camera configured to capture a plurality of first images, a second camera configured to capture a plurality of second images, a memory, and a processor configured to detect a plurality of first positions corresponding to a tip of the finger in the plurality of first images, obtain a plurality of second positions in the plurality of second images corresponding to the plurality of first positions, calculate a plurality of third positions based on the plurality of first positions and the plurality of second positions, the plurality of third positions being positions in real space of the tip of the finger, determine whether or not a calculated feature value calculated based on the plurality of third positions satisfies a condition, and determine that an action of touching an object has been performed when the calculated feature value satisfies the condition.

A touch detection apparatus including a first camera configured to capture a plurality of first images, a second camera configured to capture a plurality of second images, a memory, and a processor configured to detect a plurality of first positions corresponding to a tip of the finger in the plurality of first images, obtain a plurality of second positions in the plurality of second images corresponding to the plurality of first positions, calculate a plurality of third positions based on the plurality of first positions and the plurality of second positions, the plurality of third positions being positions in real space of the tip of the finger, determine whether or not a calculated feature value calculated based on the plurality of third positions satisfies a condition, and determine that an action of touching an object has been performed when the calculated feature value satisfies the condition.

A display apparatus includes a display section that displays an image containing one or more objects based on display image data on a display surface, a position generator that generates information representing the position of a mobile terminal that comes into contact with the display surface as terminal position information representing a terminal position in the image, an object identifier that identifies object data on an object corresponding to the terminal position based on the display image data and the terminal position information, and a transmitter that transmits the object data to the mobile terminal.

A photosensitive reflector, a laser induced touch device and a laser touch detection method are provided. The photosensitive reflector, comprising a reflection layer and a photosensitive element, wherein the photosensitive element is disposed on or in the reflection layer and configured to sense at least one of light running through the reflection layer, light incident on the reflection layer, or light reflected by the reflection layer.

The embodiments of the disclosure provide apparatus, method and system for location based touch, which can implement location based touch on the image of the projection display apparatus without the requirement of operation of the computing device by the user. A projection display apparatus comprises a projection screen and a plurality of optical sensors with two-dimension disperse layout in the back of the projection screen. The projection display apparatus further comprises an acquiring element configured to receive first light through first optical sensor of the plurality of optical sensors, wherein the first optical sensor is one or more of the plurality of optical sensors; a determining element configured to determine first coordinate information of the first optical sensor on the projection screen if the light intensity of the first light is within first light intensity range; and a sending element configured to send the first coordinate information to a computing device.

The embodiments of the disclosure provide apparatus, method and system for location based touch, which can implement location based touch on the image of the projection display apparatus without the requirement of operation of the computing device by the user. A projection display apparatus comprises a projection screen and a plurality of optical sensors with two-dimension disperse layout in the back of the projection screen. The projection display apparatus further comprises an acquiring element configured to receive first light through first optical sensor of the plurality of optical sensors, wherein the first optical sensor is one or more of the plurality of optical sensors; a determining element configured to determine first coordinate information of the first optical sensor on the projection screen if the light intensity of the first light is within first light intensity range; and a sending element configured to send the first coordinate information to a computing device.

There is provided a control device including: a projection control unit configured to control projection of an image on a projection plane by a projector; and a UI control unit configured to switch a mode of a user interface (UI) related to the projected image between two or more UI modes based on a positional relationship of the projector with respect to the projection plane.

A keyboard entry system for use in a touch screen display in which a user touches the display to move a keyboard on the display. The user moves the keyboard until a desired key lies under a fixed cursor. To type the key, the user lifts his finger.