Abstract: A card is provided with a light sensor operable to receive information via light emitted from a display screen or another source of light. Accordingly, a mobile telephonic device or portable computer (e.g., tablet computer) may communicate information to a card via light pulses. Information communicated via light may include, for example, points balances, credit balances, debit balances, transaction history, software updates, coupons, promotions, advertisements or any other type of information.

Abstract: A card is provided with a light sensor operable to receive information via light emitted from a display screen or another source of light. Accordingly, a mobile telephonic device or portable computer (e.g., tablet computer) may communicate information to a card via light pulses. Information communicated via light may include, for example, points balances, credit balances, debit balances, transaction history, software updates, coupons, promotions, advertisements or any other type of information.

Abstract: A card is provided with a touch transmitter operable to electrically communicate touch signals to a touch-sensitive screen such as a capacitive touch sensitive screen. In doing so, for example, a card may directly communicate with a mobile telephonic device or portable computer (e.g., a tablet computer).

Abstract: A card is provided with a touch transmitter operable to electrically communicate touch signals to a touch-sensitive screen such as a capacitive touch sensitive screen. In doing so, for example, a card may directly communicate with a mobile telephonic device or portable computer (e.g., a tablet computer).

Abstract: Dynamic magnetic stripe communications devices are provided as magnetic stripe emulators. A device, such as an application specific integrated circuit, may include a waveform generator that retrieves data from memory and may generate waveforms from the retrieved data to be communicated by the magnetic stripe emulator and received by a magnetic stripe reader.

Abstract: A card is provided with a light sensor operable to receive information via light emitted from a display screen or another source of light. Accordingly, a mobile telephonic device or portable computer (e.g., tablet computer) may communicate information to a card via light pulses. Information communicated via light may include, for example, points balances, credit balances, debit balances, transaction history, software updates, coupons, promotions, advertisements or any other type of information.

Abstract: A card is provided with a touch transmitter operable to electrically communicate touch signals to a touch-sensitive screen such as a capacitive touch sensitive screen. In doing so, for example, a card may directly communicate with a mobile telephonic device or portable computer (e.g., a tablet computer).

Abstract: Disclosed is a radiation detector which includes at least one photoconductive detector and a modulator, which modulates in an on-off manner radiation passing to the photoconductive detector from a radiation source. A bias source is connected to one terminal of the photoconductive detector. A first amplifier is connected to the other terminal of the photoconductive detector, and a second amplifier receives an output of the first amplifier. A first phase detector detects the phase of modulation of the radiation source by the modulator and generates a reference signal relating thereto. A switch in the second amplifier changes, in response to the reference signal generated by the first phase detector, the second amplifier between an inverting state and a non-inverting state as the modulator changes the phase of modulation of the radiation.