USE OF ORGANIC LIGHT EMITTING DIODE (OLED) DISPLAYS AS A HIGH-RESOLUTION OPTICAL TACTILE SENSOR FOR HIGH DIMENSIONAL TOUCHPAD (HDTP) USER INTERFACES
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Jul 11, 2012
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Jul 11, 2011
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Abstract
A finger-operated touch interface system is physically associated with a visual display. The system includes a processor executing a software algorithm and an array of transparent organic light emitting diodes (OLEDs) communicating with the processor. The system operates a group of OLEDS from the OLED array in light sensing mode. These OLEDs detect light via photoelectric effect and communicate light detection measurements to the processor. The software algorithm produces tactile measurement information responsive to light reflected by a finger proximate to the OLED array, and reflected light is received by at least one OLED in the transparent OLED array and originates from a software-controlled light source. In one approach, the reflected light is modulated and the system is responsive to reflected modulated light. The processor generates a control signal responsive to the reflected light. The system can be used to implement an optical touchscreen without an RF capacitive matrix.
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