LCDInfo.com :: View topic - Need some help for MGLS 320x240 CCFL (no controller)

I am using a microcontroller to control the display.
About the display I can get the characters into it and I can see the X and Y axes signals are working fine. The FLM signal looks good and I think it does the trick. (I dont know what 1/240 Duty means)
In the datasheet there is a line " 1/240 Duyt, 1/17 bias "...
The thing is that if I connect the dispoff signal to vcc the lcd gets very dark, and if i connect it to GND it doesnt display anything.
If I switch the signal on and off with the microcontroller I can get half of the LCD to work, but when I try to display all the screen it gets dark again (even if I can get half of it to work with the same code!)
I cant adjust the brightness of the LCD. Maybe my code is right and the brigtness is making the LCD turn dark.

any suggestions??

Author:	riamos [ Mon Jun 28, 2004 21:45 ]
Post subject:	Need some help for MGLS 320x240 CCFL (no controller)
I'm trying to set up the MGLS 320x240 but I cant get it to display the whole screen. Datasheets and other documents are confusing. I would like to know when to activate /DISPOFF signal and when to refresh the image so the LCD doesnt turn black. I can get the nibbles into the shift registers but when I try refreshing more than 120 lines the screen turns completley dark... If you have some information it would be very helpful!... Thanks!!

Author:	Henri [ Tue Jun 29, 2004 9:51 ]
Post subject:
What are you using to control the display ? Some microcontroller, FPGA or something else ? This document has some information about the /DISPOFF and other issues with this kind display: http://www.seiko-usa-ecd.com/lcd/produc ... g321ev.pdf

Author:	Henri [ Mon Jul 05, 2004 13:28 ]
Post subject:
Antonio Ramos wrote: I am using a microcontroller to control the display. About the display I can get the characters into it and I can see the X and Y axes signals are working fine. The FLM signal looks good and I think it does the trick. (I dont know what 1/240 Duty means) In the datasheet there is a line " 1/240 Duyt, 1/17 bias "... The thing is that if I connect the dispoff signal to vcc the lcd gets very dark, and if i connect it to GND it doesnt display anything. If I switch the signal on and off with the microcontroller I can get half of the LCD to work, but when I try to display all the screen it gets dark again (even if I can get half of it to work with the same code!) I cant adjust the brightness of the LCD. Maybe my code is right and the brigtness is making the LCD turn dark. any suggestions?? Do you have a link to the datasheet as I haven't yet seen it ? As you're using microcontroller are you sure your code executing fast enough to drive the full screen and meet the timing requirements ? I haven't yet controlled displays like this myself so I can't speak from experience, only what I've read from datasheets. But I'm planning this so I have gathered some information. Seeing the datasheet might give some ideas.

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