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Messages - Michael_L

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16
TFTs / Re: NHD-5.0-800480TF-ATXL-CTP Flickering
« on: September 08, 2015, 09:49:09 AM »
Your issue seems to be caused by some settings on your MCU, as this behavior is not reflective of a defect.  Can you try changing your pixel clock frequency to see if you see any favorable changes on the display?  Perhaps faster than what you have already tried, and also confirm this frequency with a scope.  Have you tried changing the BPP setting?  Try playing with any settings related to vertical active length/resolution as well, as it seems this fading is happening on at a portion of the display.

17
TFTs / Re: cant find 2.4inch TFT with ILI9341 controller
« on: September 08, 2015, 09:32:35 AM »
The NHD-2.4-240320SF-CTXI#-F1 has been discontinued, and replaced by our newer model NHD-2.4-240320CF-CTXI#-F.
Email notifications of this were sent out to customers in July.  Please note that the newer model uses the ST7789S controller.
The old model is still currently available (for a limited time), however at a MOQ of 2,000pcs.
If you still need some of the old display, take a look at Mouser.com.  It appears they have over 1,000pcs on order currently, you may be able to procure several hundred through them.

18
TFTs / Re: NHD-5.0-800480TF-ATXL-CTP Yellow Tint
« on: September 02, 2015, 08:29:18 AM »
As Saurabh has suggested, please try another 5.0" display (if you have one) to see if it is unique to the one 5.0" display you've tried.  Another thing to try would be inverting your pixel clock polarity (the 5.0" and 7.0" TFTs have opposite PCLK polarities).

19
OLEDs / Re: NHD-0420CW-AB3 contrast (brightness)
« on: August 14, 2015, 10:06:51 AM »
No problem.  You are free to modify the display as you like, just know any modifications to the board's circuitry will void the warranty.  If you would like us to work with you on a custom design you may feel free to email nhtech@newhavendisplay.com with your inquiry.

20
OLEDs / Re: NHD-0420CW-AB3 contrast (brightness)
« on: August 12, 2015, 10:45:59 AM »
A possible alternative could be to switch to the red color version, as it's luminance is not as bright as the blue one.

21
TFTs / Re: Extending backlight life
« on: August 12, 2015, 08:07:59 AM »
The backlight's LED half-life is actually 50,000hrs, or just over 5 years.  Yes, you are correct with your suggestions.  You may dim the backlight to extend the lifetime.  This can be done by either limiting the current using a resistor(s) or a current limited source, or by pulse width modulation (more common).

22
Character LCDs / Re: NHD-C0216CiZ-FSW-FBW-3V3
« on: August 10, 2015, 08:09:56 AM »
You're very welcome, thank you for sharing you solution!  :)

23
Character LCDs / Re: NHD-0216K1Z-YBW: some lines are out
« on: August 10, 2015, 08:09:01 AM »
Thank you for the information.  Please email nhtech@newhavendisplay.com so we can get the display here for analysis.

24
Character LCDs / Re: NHD-0216K1Z-YBW: some lines are out
« on: August 07, 2015, 11:39:16 AM »
Can you provide some information about what happened to the display before you noticed this?  Was the display dropped?  Was it in an environment near the upper/lower temperature/humidity range as indicated in the datasheet?
This typically doesn't happen by itself, at least not when all columns were once fine.
If none of the above is true, you may contact nhtech@newhavendisplay.com to setup an RMA to return the display to us for analysis.

25
Character LCDs / Re: NHD-C0216CiZ-FSW-FBW-3V3
« on: August 07, 2015, 11:35:39 AM »
From my experience, this happens when the timing is not correct.  Can you please try to increase the delay after you set the RAM address for the first line?  I know it looks as if the delay you have is 30us, however I still think it will be beneficial to try what I have suggested to see if anything changes.
Perhaps also try increasing the delay after the controller is initialized.

26
TFTs / Re: Reading display memory
« on: August 07, 2015, 11:29:28 AM »
I believe for this display the way the pixel data is stored in the controller's RAM will be 24bpp format, regardless of the format that is chosen for the writes.  Changing the color depth to 16bpp reduces the amount of time it takes to write an image to the display, which is its primary benefit.  However, the data is still arranged in the RAM as 24-bit, so when reading from the RAM this should be taken into consideration.

27
TFTs / Re: Display artifacts?
« on: August 07, 2015, 11:26:32 AM »
From what I have seen, this happens when the pixel clock, or dot clock, is not of the correct polarity.  Can you try changing the polarity of the pixel clock in your software and try the display again?

28
TFTs / Re: NHD-7.0-800480EF-ATXL#-CTP touch controller
« on: August 05, 2015, 09:59:15 AM »
The controller IC on our 7.0" CTP is the FT5406.  Are you certain the pinout between your old touch panel and ours is the same?  Are you able to run an I2C scan test to see if you can get an ACK from the slave address 0x70?  Are you keeping pin 6 (/RESET) pulled HIGH?
Also, although both versions are compatible with one another, the CTP you have of ours is the old model. Attached is a picture of the current model.


29
OLEDs / Re: Precision about Vih in NHD-0420DZW-AY5 specifications
« on: August 03, 2015, 11:43:36 AM »
The rating listed in the specification (Vih = 0.9*VDD) is confirmed to be correct.  Reliable operation can only be guaranteed if this requirement is met.

30
Character LCDs / Re: NHD-C0220BiZ-FSW-FBW-3V3M fails premature
« on: July 31, 2015, 08:31:45 AM »
It seems you may be correct in your assumption about the humidity.  The display is tested at 90% humidity, so if running for a while at or above 90% humidity, the display could most definitely fail.  If there is a way to test the humidity in the failure part's environment you may find it goes above our pass criteria, as it seems the other units you have are running good.  Humidity is a display's worst enemy!  :'(

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