hello .... i dont know what is the booster circuit is coz iam not using it ?!!! then i added this capacitor and nothing changed
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| RANDOME CONTRAST http://forum.lcdinfo.com/viewtopic.php?f=9&t=1553 |
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| Author: | hegazi [ Thu Apr 13, 2006 16:19 ] |
| Post subject: | RANDOME CONTRAST |
hello all, i bought a NOKIA LCD from sparkfun with an EPSON controller and when i connected it to my MCU i found that its contrast is changing randomly and automatically !!! plz if anyone knows how to fix this then i need his/her HELP plz, by the way i tested the code in sparkfun and it did the same .... thx in advance ... Bye |
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| Author: | lcdmania [ Fri Apr 14, 2006 14:01 ] |
| Post subject: | |
Hi, There are a special note in Sparkfun site: Special Note: We noticed that the latest shipment of LCD screens are more sensitive to noise on the power supply. The booster circuit introduces some noise that causes the display to flicker, changing brightness randomly. To suppress this noise so that the display does not flicker, the included 100uF capacitor can be soldered between GND and Vdsp of Header 2. (watch polarity on the cap!). If you are not using the booster circuit, the cap might not be needed. This cap will be included on futrure versions of this board, we just wanted to get these out now! Bye |
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| Author: | hegazi [ Fri Apr 14, 2006 17:26 ] |
| Post subject: | |
hello .... i dont know what is the booster circuit is coz iam not using it ?!!! then i added this capacitor and nothing changed
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