The ambient light detector of claim 1, further comprising aĬurrent limiter configured to limit a current in the first currentĥ. The second plurality of dark current diodes and the referenceĤ. Plurality of photodiodes and the mirror transistor and/or theĬompensation device is coupled to the second current path between The ambient light detector of claim 2, wherein the compensationĭevice is coupled to the first current path between the first
Least one of the first and second current path in response toģ. The ambient light detector of claim 1, further comprising: aĬompensation device for providing a compensation current in at Second plurality of dark current diodes are laterally arranged inĢ. Plurality, and wherein the first plurality of photodiodes and the Transistor and the reference transistor comprise a parameter ratioĬorresponding to a ratio between the first plurality and the second Transistor in the second current path, wherein the mirror Mirror transistor in the first current path and a reference Respective dark current diode from being illuminated, and whereinĮach blocking element completely covers the respective dark currentĭiode and extends laterally between the respective dark currentĭiode and at least one adjacent photodiode of the first pluralityĪnd over a portion of the at least one adjacent photodiode and a Plurality has a blocking element configured to shield the Plurality, wherein each of the dark current diodes of the second Mirror comprising: a first plurality of photodiodes in a firstĬurrent path a second plurality of dark current diodes in a secondĬurrent path, the second plurality different from the first An ambient light detector having a current mirror, the current 2, May 2014, pp.Īttorney, Agent or Firm: Slater Matsil, LLPġ. Technolgies," Electrical and Electronics Engineering: An Mohamed Atef, "Intergrated Photodiodes in Nanometer CMOS Geiger-mode avalanche diodes in standard CMOS technologies," Vignetti, et al, "Design guidelines for the integration of Suppression in Variable-Temperature Systems", Sensors, 2017, ("High Performance CMOS Light Detector with Dark Current
Larger than the second plurality and the first plurality of sensorĮlements and the second plurality of reference elements areĪrranged in an array, and wherein a sensor element and a referenceĮlement are laterally arranged on or in a common layer substrate
Second plurality of reference elements, each reference elementĬonfigured to provide a reference signal and each including aīlocking element configured to shield the respective referenceĮlement from being illuminated, wherein the first plurality is To provide a signal in response to a level of illumination and a In an embodiment an ambient light sensor includes aįirst plurality of sensor elements, each sensor element configured Invention is credited to Andrey Lysov, Hoa Vu.Īmbient light detector, detector array and methodĪn ambient light detector, a detector array and a method areĭisclosed. The grantee listed for this patent is OSRAM Opto Semiconductors GmbH. This patent grant is currently assigned to OSRAM OPTO SEMICONDUCTORS GMBH. patent number 10,852,182 was granted by the patent office on for ambient light detector, detector array and method. While these wouldn't completely stop such attacks, they would make them take longer to execute, making them impractical to carry out.U.S. He said that mitigating such attacks would be a case of requiring browsers to limit both the frequency of sensor readings (to much less than 60Hz) and the precision of sensor output (quantize the result). "This could allow the attacker to hijack the victim's account."Īt present, such sensor readings are blocked in Chrome, but supported in Firefox. "In extreme cases, for example on sites which use account recovery QR codes for emergency access to an account," he added. "Potentially more troubling is the fact that attackers can extract pixel-perfect representations of cross-origin images and frames: essentially, discover how a given site or image looks for the attacked user," he said. He said that a hacker could find out what URLs a victim has visited in the past (as these are normally a different colour) by detecting any variations the sensors pick up. As well as that, light sensor readings allow an attacker to distinguish between different screen colours. Olejnik said that the colour of the user's screen can carry useful information which websites are prevented from directly accessing for security reasons.
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