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Posted - 28 Aug 2003 :  23:49:51  Show Profile  Email Poster
I am using a ADS Graphics Master. When the product gets hot, mainly the LT1173 regulator (U9), the contrast changes to dark(more blue). Is there any way to prevent this from happening?


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Posted - 08 Sep 2003 :  10:03:29  Show Profile  Email Poster
Follow-up Summary: Working with this customer we did find that the Graphics Master circuit has a temperature dependency due to a current-limiting resistor in the Vee circuit. We will update the Graphics Master Vee circuit to eliminate this problem. Our latest products do not have this issue.

Contact us if you think this issue is affecting your Graphics Master application!

Note that the Vee requirements of most passive displays do change with temperature, which must be compensated for programmatically. In this case, however, the Vee output from the Graphics Master was changing with temperature, which was our issue to resolve.

Drew Kidder
ADS Technology Transfer
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