Flat panel display device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 13, 2001
Grant Date -
N/A
app pub date -
Mar 25, 1999
filing date -
Mar 26, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A positive polarity D/A converter 11 and a negative polarity D/A converter 12 are formed of an IC chip having the same structure and the same breakdown voltage respectively. When a horizontal clock signal CKH is in a non-conformity state, a clock monitoring circuit 124 contained in the negative polarity D/A converter 12 selects inputs of switch circuits 113, 123 such that outputs of the positive polarity D/A converter 11 and the negative polarity D/A converter 12 can be set to the same potential as an external input. Accordingly, since an output of a D/A converter 10 and an output of a common circuit 13 become a substantially identical potential, application of a DC voltage to a liquid crystal layer can be prevented. Alternatively, the same operation as the above can be achieved by monitoring the horizontal clock signal CKH by using a clock monitoring circuit 114 of the positive polarity D/A converter 11.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully