Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Reexamination Certificate
2008-10-29
2010-11-02
Luu, Thanh X (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
C345S102000, C345S207000, C250S2140AL
Reexamination Certificate
active
07825361
ABSTRACT:
In a light sensor test unit, a test circuit is built in a display panel and connected to an output node of a light sensor which senses an intensity of an external light. When external light having a predetermined intensity is provided to the light sensor, the test circuit outputs a driving signal in response to a sensing signal output from the output node. A test pixel part includes pixels selected from a plurality of pixels arranged in the display panel and receives the driving signal from the test circuit to display a gray-scale corresponding to the driving signal. A brightness measurer measures a brightness corresponding to the gray-scale displayed in the test pixel part to compare the measured brightness with a predetermined brightness, thereby testing whether the light sensor built in the display panel is normally operated.
REFERENCES:
patent: 6081254 (2000-06-01), Tanaka et al.
patent: 7345669 (2008-03-01), Ohashi et al.
patent: 2007/0272831 (2007-11-01), Dailey et al.
patent: 2003131798 (2003-05-01), None
Cha Young-Ok
Cho Man-Seung
Maeng Ho-Suk
Pak Sang-Jin
Uh Kee-Han
Cantor & Colburn LLP
Luu Thanh X
Samsung Electronics Co,. Ltd.
LandOfFree
Light sensor test unit of testing a light sensor that senses... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Light sensor test unit of testing a light sensor that senses..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Light sensor test unit of testing a light sensor that senses... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4160596