Active matrix emissive display and optical scanner system, methods and applications
First Claim
1. A method of operating a display screen configured to optically scan an object placed in close proximity to the display, the display having a plurality of light emitting and sensing diodes operable as light emitters and light sensors, comprising:
- dynamically and visually indicating an area of the display screen to be scanned by enabling certain of the light emitting and sensing diodes as light emitters associated with the area; and
producing data representative of the output levels from light emitting and sensing diodes operating as light sensors at least in the indicated area of the display screen to be scanned.
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Abstract
An active matrix emissive display (ED) is disclosed that also includes optical scanning capability. Each display pixel is independently addressable and independently internally driven for light generation. Each display pixel is also given the ability to be coupled to detection circuitry in order to sense currents or voltages that are optically generated or leaked by its internal LED when exposed to light (and thus acting in a photodiode capacity). Since the intensity of the light illuminating the diode determines the magnitude of generated currents and/or voltages or leakage current through the diode (when reverse biased), these sensed currents or voltages give an indication of the intensity of the light striking the pixel. In this manner, active matrix ED pixels are configured to serve the dual purpose of being able to generate and detect light.
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Citations
20 Claims
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1. A method of operating a display screen configured to optically scan an object placed in close proximity to the display, the display having a plurality of light emitting and sensing diodes operable as light emitters and light sensors, comprising:
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dynamically and visually indicating an area of the display screen to be scanned by enabling certain of the light emitting and sensing diodes as light emitters associated with the area; and producing data representative of the output levels from light emitting and sensing diodes operating as light sensors at least in the indicated area of the display screen to be scanned. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of operating a device, including a display capable of emitting and sensing light, in a commercial transaction, comprising:
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indicating an area of the display screen to be optically scanned by enabling certain of the light emitters; performing a biometric scan on an area of the display by reading output levels from the light sensors of the display screen at least in the indicated area of the display screen to be scanned; and requesting authorization from a remote system to complete the transaction. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification