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Messages - Sergio_M

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1
TFTs / Re: TFT Display with Beagle Green
« on: February 19, 2019, 11:36:06 AM »
Hello,

Our 5.0” TFT is a “raw pixel-dot-clock” display and does not have an SPI/parallel type controller or any kind of RAM.
The display is supposed to be constantly refreshed, at 60Hz, with a pixel clock, V sync, H sync, etc.
There are some high-end processors such as that used in the BeagleBone that can natively support such RGB TTL display.
You would also need an LED driver circuit to drive the backlight separately.

Please note we sell a 7.0” BeagleBone Black cape (NHD-7.0CTP-CAPE-L) it’s an open source hardware and the schematic is available for your reference, the pinout is similar to our 5” TFT.

Please view the links below:
Product specification: http://www.newhavendisplay.com/specs/NHD-7.0CTP-CAPE-V.pdf
User Guide: http://www.newhavendisplay.com/specs/NHD-7.0CTP-CAPE-V.pdf

NHD-5.0-800480TF-ATXL#-CTP data sheet: http://www.newhavendisplay.com/specs/NHD-5.0-800480TF-ATXL-CTP.pdf

Best Regards,

2
Hello,

Is the image flickering or is it the backlight? Typically, customers tie IOVDD to VDD. We also tie IOVDD to VDD, when we build an evaluation kit, this would be the reason why you measured 3.3V for IOVDD and VDD when using the NHDev board.
The flickering may be the result of the backlight LEDs being over driven, the current must be limited to 100mA typical. The backlight is independent of the TFT’s controller. The LED backlight is current driven and must be limited using a resistor circuit or by using a constant current source.

Best Regards,

3
Hello,

I am sorry to hear you are experiencing issues with the display. We do test our capacitive touch panels 100% for functionality before they leave our facility, were the displays purchased from Newhaven or a distributor? 

Could you tell me how long the touch panel was working before the upper and lower zones stopped responding? Was the display dropped at all? Was the touch panel’s flex cable subjected to any type of excessive stress/strain when being transported or during testing? Are there any sharp bends or twist on the cable?

Are there more displays you have with this issue? It’s difficult to say where the fault is without having the physical unit here to analyze. I would not recommend taking the unit apart as this will void the warranty. We will certainly help and get to the bottom of the issue.
Could please respond to this post in an email to (techsupport@newhavendisplay.com) we can further assist you.

Best Regards,

4
Evaluation Tools / Re: Is the source-code for the NHDev board available?
« on: February 12, 2019, 04:03:09 PM »
Hi Eric,

Unfortunately we do not share the source code for our NHDev board.
 
If you are trying to edit the text shown on the display, this can be done by editing the text file on the SD card, as explained on page 13-15 of the NHDev board's user guide: http://www.newhavendisplay.com/nhdev/specs/NHDev_v2.pdf

If you need to change the output routine for this specific application, it may be best to program an alternative board like an Arduino using code from our app notes page. You would be able to modify this code however you need.
https://www.newhavendisplay.com/app_notes.html

Best Regards,
 

5
TFTs / Re: random phantom touches - how to fix?
« on: February 08, 2019, 09:36:25 AM »
Hello,

Could you please confirm the display's part number.

A good place to start would be to find out if any components in your design are generating noise that the touch panel might pick up. The display's bezel can act as a shield keeping noise from other system components from reaching the touch panel, it is good practice to ground the display's bezel.
A few tips that should help improve your design and eliminate ghost touches:

- Ground the display's bezel.
- Use flat cable ferrite core, used for the FPC / FCC cable.
- Use EMI shielding foils and films.

Best Regards,

6
OLEDs / Re: Connecting the NHD-0420-CW Display to the Evalboard
« on: October 11, 2018, 08:11:06 AM »
Hello,

Unfortunately, the NHDev board does not support I2C interface, you can test in parallel mode to see how the display looks.

7
Accessories / Re: Bezel for NHD-C0216CiZ-FSW-FBW-3V3
« on: June 06, 2018, 05:16:11 PM »
We do make bezels for our displays but only as a custom designs which require a 1000 piece minimum order quantity. You may want to try contacting Elwood Controls, who manufactures bezels/frames to fit most of our displays. I would recommend visiting their website:  http://www.elwoodcontrols.com/Bezels.html to see if they have something that would work for you.

8
Evaluation Tools / Re: LED backlight at 40mA
« on: June 06, 2018, 05:08:01 PM »
Unfortunately, there isn't a way to make this modification. With which display are you trying to use this video board? Have you considered using one of our new EVE2 modules?
http://www.newhavendisplay.com/tft-modules-eve2-tft-modules-c-1_990_992.html

9
Character LCDs / Re: Get Cursor Position Command
« on: June 06, 2018, 05:05:19 PM »
Thank you for your feedback. We will certainly take this into consideration for the future designs. As a solution to your current problem, have you though about creating a write routine which a the end of sending the character string returns the cursor to a known position?

10
Character LCDs / Re: NHD-0108BZ-RN-GBW-ND Contrast Problem
« on: June 06, 2018, 05:01:39 PM »
Pin 3 of the display is tied to the bias voltage circuit which you can see on page 29 of the controller datasheet. The 0.6V for optimal contrast specified in the display datasheet is what you should be measuring with the display (load) connected. Another thing you can do is simply tie pin 3 to Ground (0V) however you would lose any tunability by this approach.

11
OLEDs / Re: "Ghosting" artifact on NHD-1.69-160128ASC3
« on: June 06, 2018, 05:00:24 PM »
What you are seeing is normal behavior, to a certain extant. This is a passive matrix OLED display and when drawing certain images / patterns on the screen you can see a difference in brightness between some pixels depending on their location on the screen. While this cannot be completely avoided, you can try optimizing the pixels brightness in your software.

12
There is another command "Cursor/Display Shift" that can change the cursor position. Are you using this command? if so, what value are you sending?

13
New Product Wishlists / Re: Please use standard 2.54 mm Pin pitch
« on: June 06, 2018, 04:54:14 PM »
Thank you for your feedback. The existing pin design is not meant to be used with the board receptacle and therefor does not conform t the commonly used 2.54mm pitch. If we were to design these pins with a 2.54mm pitch, the user would have to take additional care while handling these parts as these leads are more fragile than rectangular headers. Mishandling can not only damage the pins but also the glass since the leads are crimped directly onto the glass rather than a PCB.

14
Hello,

To help you getting started please take a look at our example initialization code.
8-bit parallel: https://newhavendisplay.com/appnotes/excode/txt/CharLCD/8bit_character.txt

If you have any question please contact us @: techsupport@newhavendisplay.com

15
TFTs / Re: Touch shifting on NHD-7.0-HDMI-N-RSXV-RTU
« on: March 29, 2018, 09:21:09 AM »
Hi,

It may seem the touch panel might have not been calibrated correctly, which could explain the touch shift. The AR1100 (Resistive Touch Screen Controller IC) shows up like a USB mouse, it works on all operating systems as the computer doesn't know it's a touch screen, it just thinks its a mouse. You can adjust the AR100 to consider itself a Touch Digitizer, supported by many but not all computers.

If you have a Raspberry Pi available you may  re-calibrate the touch IC via USB using the following program:

https://github.com/tom-2015/rpi-AR1100

or

If you have a Windows computer you may re-calibrate the touch IC via USB using the following program:

http://www.microchip.com/wwwproducts/en/AR1100#documentation


Hope this helps,

If you have any questions please email me: smartinez@newhavendisplay.com



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