Author Topic: Voltages and Power_Control registers with NHD-1.8-128160EF-CSXN#-F  (Read 1516 times)


  • Newbie
  • *
  • Posts: 1
  • Karma: 0
    • View Profile
Hi all!

We are using the NHD-1.8-128160EF-CSXN#-F in our design and we noticed a slight flickering that we did not see with the NHDev board. We believe that the flickering is caused by the different voltages of the power supply because we use 1.8 V for IOVDD and 2.6 V for VDD. On the NHDev board we measured 3.3 V for both.

The display is initialized with the same sequence as on page 10 in the datasheet. The commands for Power_Control are suspicious as they set the voltages for the TFT and they probably need to be adapted for our power supply. My question is if the parameter of the Power_Control should be changed when different voltages are used and if yes to which values? Also we will maybe change VDD to 2.8 V and in the next days we will install additional capacitors to make the power supply more stable.


  • Administrator
  • Jr. Member
  • *****
  • Posts: 22
  • Karma: 0
    • View Profile
Re: Voltages and Power_Control registers with NHD-1.8-128160EF-CSXN#-F
« Reply #1 on: February 19, 2019, 11:23:11 AM »

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,


Filling with blue yields flashing white screen (NHD-2.4-240320CF-CSXN#-F)

Started by asfarleyBoard TFTs

Replies: 2
Views: 2309
Last post December 11, 2018, 07:17:54 AM
by Paul_B
protecting NHD-1.8-128160EF-CTXI# from ESDs on a battery powered application

Started by tsmrndBoard TFTs

Replies: 2
Views: 1089
Last post December 31, 2019, 11:33:15 AM
by Sergio_M
NHD-2.4-240320CF-CSXN#-F works in 18 bits(262K colors) mode

Started by charlieBoard TFTs

Replies: 3
Views: 6233
Last post March 15, 2016, 10:39:50 AM
by Saurabh_B
EVE2 TFT Module VHDL Code Support (NHD-3.5-320240FT-CSXN-CTP)

Started by bivinBoard TFTs

Replies: 0
Views: 3069
Last post March 19, 2018, 12:06:34 AM
by bivin
NHD-1.8-128160EF-CTXI ili9163 & SAM3s driver help needed

Started by JsaggioBoard TFTs

Replies: 0
Views: 5113
Last post February 01, 2016, 01:02:58 AM
by Jsaggio