Author Topic: help! NHD-4.3-480272EF-ATXL#-T touch panel rotates 90 degrees  (Read 1321 times)

knightsun

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help! NHD-4.3-480272EF-ATXL#-T touch panel rotates 90 degrees
« on: September 22, 2016, 12:19:34 AM »
Hello,
I am working at a TFT 4.3" LCD moudle NHD-4.3-480272EF-ATXL#-T. The LCD display is good, but the touch panel does not work well. 
when i press "up",it locates at the "left" position.
when i press "down",it locates at the "right" position.
it seems that the touch screen is rotated 90 degrees to the right and the touch screen (only the touch, no LCD) turns to be "272 x 480" ,not "480 x 272".
when i use a LCD moudle from another manufacturer, the LCD and touch panel are both OK,thus I think my driver is good.
Could anyone here kindly give me some help?
Thanks!

Paul_B

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Re: help! NHD-4.3-480272EF-ATXL#-T touch panel rotates 90 degrees
« Reply #1 on: September 22, 2016, 09:12:53 AM »
Morning knightsun,

Sounds like the resistive touch lines are swapped  :o

The 4 wires are referred as XL (left), XR (right), YU (top) and YD (down).

The Pin Description is listed on page 4 in the displays datasheet:

http://www.newhavendisplay.com/specs/NHD-4.3-480272EF-ATXL-T.pdf

Please verify that both LCD's share the same pin assignment.

Hope this helps, keep us posted on your progress!
 

knightsun

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Re: help! NHD-4.3-480272EF-ATXL#-T touch panel rotates 90 degrees
« Reply #2 on: September 26, 2016, 03:58:20 AM »
yes, it swapped. but i do not know where it swapped. the signals are connected follow the datasheets. i used 2 displays: one is NHD-4.3-480272EF-ATXL#-T, the other is VGG482710-6UFLWB from Evervision. when i use VGG482710-6UFLWB, the touch works well, when i change to NHD-4.3-480272EF-ATXL#-T, the touch swapped.  :'( is there any "defaut settings" about the direction of the touchscreen?
thanks!

knightsun

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Re: help! NHD-4.3-480272EF-ATXL#-T touch panel rotates 90 degrees
« Reply #3 on: September 26, 2016, 11:58:01 PM »
Morning knightsun,

Sounds like the resistive touch lines are swapped  :o

The 4 wires are referred as XL (left), XR (right), YU (top) and YD (down).

The Pin Description is listed on page 4 in the displays datasheet:

http://www.newhavendisplay.com/specs/NHD-4.3-480272EF-ATXL-T.pdf

Please verify that both LCD's share the same pin assignment.

Hope this helps, keep us posted on your progress!

i checked the two LCD's pin assignment and connection, and they are correct.
i now add two jumpers on the PCB. one leads  XL to XL, XR to XR, YU to YU and YD to YD, the other leads XL to YU, XR to YD, YU to XL and YD to XR, so the PCB can be compatible with the two different touchscreens.

 

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