Abstract: A display apparatus comprises an at least partially transparent display, the display configured to generate light to form an image for display to a user positioned in front of the display, and at least one light-transmitting and/or light-receiving device positioned behind the display, wherein the at least one light-transmitting and/or light-receiving device is configured to transmit and/or receive light through at least part of the display, wherein the at least one light-transmitting and/or light-receiving device comprises or forms part of an optical wireless communications (OWC) apparatus configured to transmit and/or receive the light through the at least part of the display.

Abstract: A display apparatus comprises an at least partially transparent display, the display configured to generate light to form an image for display to a user positioned in front of the display, and at least one light-transmitting and/or light-receiving device positioned behind the display, wherein the at least one light-transmitting and/or light-receiving device is configured to transmit and/or receive light through at least part of the display, wherein the at least one light-transmitting and/or light-receiving device comprises or forms part of an optical wireless communications (OWC) apparatus configured to transmit and/or receive the light through the at least part of the display.

Abstract: An optical communication access point comprises: an optical communication channel for allowing wireless light communication with a remote device, and a memory for storing content, wherein the content in the memory is accessible by the remote device via the wireless light communication link.

Abstract: An optical wireless communication system comprising a transmitter apparatus that comprises: an illumination light source configured to output visible light for illumination purposes, and a controller configured to control operation of the illumination light source to produce modulation of the visible light to provide an optical wireless communication signal representing data; a further light source configured to output further light, wherein the controller is configured to control operation of the further light source to produce modulation of the further light to provide a further optical wireless communication signal representing substantially the same data, wherein the visible light and the further light have different wavelengths.

Abstract: A camera for capturing an image comprising: an image sensor configured to generate image sensor data in response to received light; a processing resource configured to process the image sensor data to obtain image data and communication data, wherein obtaining the communication data comprises performing a demodulation process in respect of at least part of the image sensor data, wherein the processing resource is further configured to transmit the communication data and the image data to at least one further processing resource.

Abstract: An optical wireless communication system comprises: a first device comprising a transceiver apparatus; and a plurality of further devices each comprising respective further transceiver apparatus, wherein the first device is configured to communicate via at least one optical channel with the plurality of further devices, and the transceiver apparatus of the first device comprising: a receiver for receiving light (optionally of a first wavelength or range of wavelengths) representing optical wireless communication signals transmitted by the further devices, the receiver comprising at least one photodetector, receiver-side processing circuitry for processing optical wireless communication signals received by the receiver to extract data represented by the received optical wireless communication signals; a transmitter for transmitting further light (optionally of a second wavelength or range of wavelengths)s representing optical wireless communication signals; transmitter-side processing circuitry for producing o

Abstract: An optical wireless communication (OWC) receiver apparatus for receiving data streams from at least one transmitter apparatus, each data stream encoded on abeam of light of a respective different wavelength or range of wavelengths propagating through free space between the at least one transmitter apparatus and the receiver apparatus, the apparatus comprising: a wavelength-selective element configured to receive the beams after their propagation through free space and to direct a selected at least one of the beams having a selected wavelength or range of wavelengths to a detector, wherein the detector is configured to receive said selected at least one of the beams and in response to output a detection signal; at least one control element operable to control at least one physical property of the wavelength-selective element thereby to select said at least one of the beams for direction to the detector.

Abstract: An optical wireless communication system comprising a transmitter apparatus that comprises: an illumination light source configured to output visible light for illumination purposes, and a controller configured to control operation of the illumination light source to produce modulation of the visible light to provide an optical wireless communication signal representing data; a further light source configured to output further light, wherein the controller is configured to control operation of the further light source to produce modulation of the further light to provide a further optical wireless communication signal representing substantially the same data, wherein the visible light and the further light have different wavelengths.

Abstract: An optical wireless communication (OWC) transmitter comprising a baseband chip comprises: a media access control (MAC) layer configured to receive data from a network; a first physical (PHY) layer associated with a first light source; and a second physical (PHY) layer associated with a second light source; wherein the first PHY layer is configured to receive first data from the MAC layer and provide a first signal to the first light source, so as to drive the first light source to emit first modulated light that comprises or is representative of the first data; and the second PHY layer is configured to receive second data from the MAC layer and provide a second signal to the second light source, so as to drive the second light source to emit second modulated light that comprises or is representative of the second data.

Abstract: An optical wireless communication (OWC) receiver comprises: a photodetector device configured to receive light and to produce a detection signal in response to the received light; receiver circuitry configured to receive and process the detection signal to produce a receiver signal; signal processing circuitry configured to apply a decoding and/or demodulation process to the receiver signal in accordance with an OWC communication protocol thereby to extract data from the receiver signal; wake-up circuitry configured to monitor output from the photodetector device or the receiver circuitry, for a predetermined frequency or range of frequencies, and in response to the monitored output being indicative that the received light represents an OWC signal performing a wake-up procedure to move at least the signal processing circuitry from a first, lower power state to a second, higher-power state, wherein in the first lower power state the signal processing circuitry is configured to not perform said decoding and/or

Abstract: An optical communication access point comprises: an optical communication channel for allowing wireless light communication with a remote device, and a memory for storing content, wherein the content in the memory is accessible by the remote device via the wireless light communication link.

Abstract: A mobile device comprises a plurality of transmitters and receivers, each configured for optical wireless communication, wherein the plurality of transmitters and/or receivers are arranged on at least three surfaces of the mobile device such that each of the three surfaces has a respective at least one of the transmitters and/or each of the three surfaces has a respective at least one of the receivers.

Abstract: An optical wireless communication (OWC) receiver apparatus for receiving data streams from at least one transmitter apparatus, each data stream encoded on abeam of light of a respective different wavelength or range of wavelengths propagating through free space between the at least one transmitter apparatus and the receiver apparatus, the apparatus comprising: a wavelength-selective element configured to receive the beams after their propagation through free space and to direct a selected at least one of the beams having a selected wavelength or range of wavelengths to a detector, wherein the detector is configured to receive said selected at least one of the beams and in response to output a detection signal; at least one control element operable to control at least one physical property of the wavelength-selective element thereby to select said at least one of the beams for direction to the detector.

Abstract: An optical wireless communication device for transmitting data comprises a transmitter comprising a light source, a controller configured to control operation of the light source to produce modulated light comprising an optical wireless communication signal representative of said data, at least one proximity determining component configured to determine a proximity of an object, and a processing resource configured to determine whether the determined proximity is within a threshold distance, wherein the controller is configured to control operation of the transmitter and/or of at least one other component of the optical wireless communication device in dependence on whether the determined proximity is within the threshold distance.

Abstract: A luminaire driver apparatus for use with one or more light emitting diodes or other light sources, comprises voltage control circuitry configured to regulate a supply voltage to one or more light emitting diodes or other light sources; driving circuitry configured to provide a drive current to the one or more light emitting diodes or other light sources, the drive current being dependent on the supply voltage, wherein the driving circuitry is configured to modulate the drive current based on a modulated drive signal such that the one or more light emitting diodes or other light sources produces an optical signal, wherein at least one of the driving circuitry and control circuitry are operable to adapt to a plurality of different types of light emitting diode or other light source. Thereby providing a universal driver function.

Abstract: A wireless communication method includes sending, by a first device in a wireless network, a poll packet (32, 38, 44) for polling a second device in the wireless network. The poll packet includes an address of the second device. The second device receives and at least partially decodes the poll packet. The second device sends a response packet (36, 40, 46) in response to the poll packet. The sending of at least part of the response packet is substantially simultaneous with the receiving of at least part of the poll packet by the second device. Wireless communication systems, transmitters and receivers using the method are also described.

Abstract: A collision avoidance method for a wireless network comprising a plurality of devices, the method comprises receiving, by a first device of the plurality of devices, a message from a second device of the plurality of devices, transmitting, by the first device, a busy signal in response to the receiving of at least part of the message from the second device, the transmitting of the busy signal being at least partly simultaneous with the receiving of the message, receiving, by at least one further device of the plurality of devices, the busy signal, and delaying, by the at least one further device and in response to the busy signal, transmission of at least one further message by the at least one further device.

Abstract: A mobile device comprises a plurality of transmitters and receivers, each configured for optical wireless communication, wherein the plurality of transmitters and/or receivers are arranged on at least three surfaces of the mobile device such that each of the three surfaces has a respective at least one of the transmitters and/or each of the three surfaces has a respective at least one of the receivers.

Abstract: A display apparatus comprises an at least partially transparent display, the display configured to generate light to form an image for display to a user positioned in front of the display, and at least one light-transmitting and/or light-receiving device positioned behind the display, wherein the at least one light-transmitting and/or light-receiving device is configured to transmit and/or receive light through at least part of the display, wherein the at least one light-transmitting and/or light-receiving device comprises or forms part of an optical wireless communications (OWC) apparatus configured to transmit and/or receive the light through the at least part of the display.

Abstract: A mobile device comprises a plurality of transmitters and receivers, each configured for optical wireless communication, wherein the plurality of transmitters and/or receivers are arranged on at least three surfaces of the mobile device such that each of the three surfaces has a respective at least one of the transmitters and/or each of the three surfaces has a respective at least one of the receivers.