Newhaven Display Forum

Newhaven Products => TFTs => Topic started by: marsaf on February 18, 2016, 01:53:27 AM

Title: Connecting 18bit controler to 24bit display
Post by: marsaf on February 18, 2016, 01:53:27 AM
Please advice, how to correctly connect 18bit RGB microcontroler to 24bit display i.e. NHD-7.0-800480EF-ATXV#-CTP. Should be R0, resp. G0, resp. B0 from microcontroler connected to R0, resp. G0, resp. B0 on display or to R2, resp. G2, resp. B2? Will the lack of bpp affect only color range or even contrast (or brightness) of the display? Thank you very much!
Title: Re: Connecting 18bit controler to 24bit display
Post by: Paul_B on February 18, 2016, 08:15:56 AM
Morning Marsaf,

Great question, I have attached a snippet of one of my schematics to help illustrate the correct configuration when utilizing 18bit RGB.

You will notice that the LSBs (least significant bits) are tied to ground.

To answer your second question, the lack of bpp will only affect the color depth.

Hope this helps!

 
Title: Re: Connecting 18bit controler to 24bit display
Post by: marsaf on February 22, 2016, 12:07:19 AM
O.K., according to your scheme, I've connected it in a wrong way (R0,G0,B0 from controller to R0,G0,B0 on display, etc.), because correct way (R0,G0,B0 from controller to R2,G2,B2 on display, etc.). And that was the reason, why the display was kind of dull, and it didn't get the maximum backlighting.

thank you very much
Title: Re: Connecting 18bit controler to 24bit display
Post by: Paul_B on February 22, 2016, 07:53:58 AM
Not a problem Marsaf, happy to help!
Title: Re: Connecting 18bit controler to 24bit display
Post by: eb8481 on May 23, 2016, 05:36:22 AM
Is the connection schematic that you attached suitable for NHD-3.5 320240MF ATX tft module ? I will connect the R0,R1,G0,G1,B0,B1 to the GND and R2-R7 to MCU R2-R7 (  B2-B7 to MCU B2-B7 and G2-G7 to MCU G2-G7). Please confirm my connections.
Title: Re: Connecting 18bit controler to 24bit display
Post by: Paul_B on May 23, 2016, 08:43:09 AM
Morning eb8481,

Correct, the LSBs (least significant bits) of each color data line will need to be tied to ground when 18-bit RGB interfacing is being used.

 ;)