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Part Number: MSP430FR6043
Can you see the following menu in he Edit window?
The red button is to insert media including pictures.
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In reply to Lixin Chen1:
In reply to GARRET CRISLER:
It is very strange you cannot see the menu box I attached in the thread. Could you check with if there is any other buttons like "Edit more" you can try to see if the menu box can display? Or could you check your explorer version? Maybe changed to IE explorer or Google Chrome?
For the LCD 8 mux contrast question, the contrast should be poor theoretically for 8 mux @ 1/3 bias mode. 8 mux @ 1/4 bias LCD will be much better for the contrast.
Do you have any update for for this? Do you have resolved the file attaching issue?
It seems you have your default editor set to Plain Text instead of Enhanced. To change this, click your Profile Icon on the top right of your screen. Click Settings and it will open up another page. From here find Content Editor on the page and hit the radio button for Enhanced, then save the settings. You may need to log out and back into E2E to see this change.
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In reply to Jace H:
Okay that worked on getting the editor working. Not sure how it got set to Plain mode.
Here is the photo of the display and oscope. The scope is 1 v/div. The display charge pump is at 3.2 v, I have adjusted it from 2.6 up to 3.4 volts. I am thinking the ghosting is caused by the driver not being able to adjust the steps quick enough.
your wiring looks good mechanically when taking such a ribbon cable. Electrically however it causes the reflections you can see.
Our LCD drivers have high impedance outputs, meant to be interfaced to the LCD display not far away from the device ...3-4" and connected using traces that are not backed with a ground plane on the PCB to reduce the stray cap towards ground... and to keep the apparent impedance as high as possible. The standard ribbon cables have a differential impedance of about 100 Ohms. And that when no guard ground is used, elsewise lower.
What you can see on the scope are the reflections caused by the cabling. Tearing the ribbon cable apart should improve the situation. But a long cable is still not optimal...
Transmission line theory is the key element here; it causes funny effects sometimes...
have a nice day,
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In reply to Johann Zipperer:
Well none of the above answer is applicable. The MSP430FR6043 is mounted directly backside of the LCD. The ribbon cable is simply being used for programming and supplying power. I also tried running the display directly from a battery. No difference. I have also produced several of the same boards and they all act identical, so it isn't my soldering or random bad chip or display. The other issue is that I cant mount external resistors to produce the bias voltage as these pins are used as the LCD display COM lines on this chip.
Do you have found the root cause of the glitch on LCD signals? Maybe adding a pF capacitor at the end of LCD signal can help.
For the ghosting, could you try to increase the frame frequency? Normally, higher frame frequency can help to reduce the ghosting but may not eliminate all.
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