Newhaven Display Forum

Newhaven Products => TFTs => Topic started by: sai on May 27, 2016, 04:11:19 AM

Title: NHD-5.0-800480TF-ATXL-CTP with LPC1788
Post by: sai on May 27, 2016, 04:11:19 AM
i am new to TFT display, i want to use NHD-5.0-800480TF-ATXL-CTP display in one of my application with LPC1788 controller. LPC1788 is an ARM Cortex-M3 based microcontroller, it has 512 KB flash, 64 KB SRAM and in built LCD controller with Selectable display resolution (up to 1024 X 768 pixels) and 24-bit true-color mode.
1. Are these specifications enough to handle the NHD-5.0-800480TF-ATXL-CTP display or not?
2. how to calculate Frame Buffer size for 24 bpp?
Title: Re: NHD-5.0-800480TF-ATXL-CTP with LPC1788
Post by: Michael_L on June 03, 2016, 09:29:40 AM
If the TFT interface on that microcontroller can support up to 1024x768 pixels, then using our 800x480 pixel TFT with it will be fine.
To calculate frame buffer:
800 (horizontal pixels) x 480 (vertical pixels) x 3 (24bpp [3 bytes per pixel]) = 1,152,000 bytes.
Title: Re: NHD-5.0-800480TF-ATXL-CTP with LPC1788
Post by: sai on July 05, 2016, 09:07:23 AM
Hi micheal,
 Thanks for the reply,
as per calculation frame buffer size is 1.15MB so i decided to go with external SDRAM interface using External Memory Controller(EMC) in Controller.
Is there any PCB guidelines for TFT data signals lines strip impedance in the PCB?? generally what could be the Impedance value for the Data line to interface with TFT display???
Title: Re: NHD-5.0-800480TF-ATXL-CTP with LPC1788
Post by: sai on August 17, 2016, 02:51:01 AM
could anyone please suggest LED driver circuit for NHD-5.0-800480TF-ATXL-CTP display, currenly i am using FAN5333B IC for LED Back light driving circuit but when i connected display LED+ voltage drops from 28V to 15V so Display back light is not enabling. i have attached my circuit image.
Title: Re: NHD-5.0-800480TF-ATXL-CTP with LPC1788
Post by: Paul_B on August 17, 2016, 07:39:33 AM
Morning,

There must be a mistake in your schematic, for your reference please see the attachment.