Proximity sensors with smudge detection capabilities
First Claim
1. An electronic device, comprising:
- a display layer having a surface;
a proximity sensor mounted under the display layer, wherein the proximity sensor has a first light source that is configured to emit a first light signal and a light detector configured to receive reflections of the first light signal; and
a second light source that is configured to emit a second light signal that travels within the display layer by total internal reflection, wherein the light detector is configured to measure the second light signal to monitor smudges on the surface of the display layer.
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Accused Products
Abstract
An electronic device may be provided with a touch screen display that is controlled based on information from a proximity sensor attached underneath a display layer. The proximity sensor may have a light source that emits infrared light and a light detector that detects reflected infrared light. When the electronic device is in the vicinity of a user'"'"'s head, the proximity sensor may produce data indicative of the presence of the user'"'"'s head. Variations in proximity sensor output due to smudges on the proximity sensor can be detected by providing the proximity sensor with an additional light source. The additional light source may be used to inject light into the display layer. The injected light may be guided within the display layer by total internal reflection. In the presence of smudge, the internally reflecting light may deviate from its normal propagation path.
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Citations
24 Claims
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1. An electronic device, comprising:
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a display layer having a surface; a proximity sensor mounted under the display layer, wherein the proximity sensor has a first light source that is configured to emit a first light signal and a light detector configured to receive reflections of the first light signal; and a second light source that is configured to emit a second light signal that travels within the display layer by total internal reflection, wherein the light detector is configured to measure the second light signal to monitor smudges on the surface of the display layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 22, 23)
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9. A method of operating an electronic device having a display layer, a proximity sensor mounted under the display layer, and a light source, the method comprising:
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gathering proximity sensor data by emitting first light signals and detecting corresponding reflected light signals with the proximity sensor, wherein the first light signals exit the display layer and are reflected off of an external object to generate the corresponding reflected light signals; and emitting second light signals into the display layer using the light source, wherein the second light signals are guided within the display layer by total internal reflection within the display layer. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 24)
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18. A method for operating an electronic device having a display layer, a proximity sensor mounted under the display layer, and a light source, the method comprising:
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gathering proximity sensor data by emitting first light signals and detecting corresponding reflected first light signals with the proximity sensor; gathering additional data by emitting second light signals with the light source and detecting corresponding reflected second light signals with the proximity sensor; and determining whether an external object is in the vicinity of the electronic device based on the gathered proximity sensor data and the additional data. - View Dependent Claims (19, 20, 21)
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Specification