Newhaven Display Forum

Newhaven Products => TFTs => Topic started by: dfansler on January 18, 2015, 07:29:27 PM

Title: Controller for 800x480 TFT Display
Post by: dfansler on January 18, 2015, 07:29:27 PM
I have a couple of the 800x489 TFT displays.  The older one came with the SSD1963 controller and the newer one (NHD-7.0-800480EF-ATXL#-T) without a controller.
question 1 - do I need a controller for the newer unit, or can i drive it from the 40 pin cable?
question 2 - can I replace the SSD1963 controller board with a NHD-7.0-800480EF-34 Controller Board?
question 3 - why did NHD quit using the SSD1963 on the 7" TFT Displays?
Thanks and Kind regards,
David
Title: Re: Controller for 800x480 TFT Display
Post by: Michael_L on January 19, 2015, 02:34:41 PM
TFTs typically have a digital RGB interface (essentially digital VGA) and are simply LCD panels that require pixel data (RGB data bus) and timing/synchronization signals (HSYNC, VSYNC, pixel clock).
Using a TFT with a TFT controller, such as the SSD1963, allows for a standard MCU type interface (8/16 bit parallel data bus, control signals such as command/data selection, active LOW write, etc.)
The TFT controller outputs the necessary 24bits of RGB, and the timing signals for you.  Some development boards / microcontrollers have TFT drivers/controllers built-in, and would therefore not need an external TFT controller such as the SSD1963.  Most others do not have a TFT driver/controller, which is where you would typically use an external one.  There are several TFT controllers on the market (the SSD193 being one of them) so you may use whatever you prefer.

Yes, the NHD-7.0-800480EF-ATXL#-T can be used with the NHD-7.0-800480EF-34 Controller Board (16-bit interface) or the NHD-7.0-800480EF-20 Controller Board (8-bit interface).

Many customers either prefer driving our TFTs directly, or with some other TFT controller they are using or have used.  This is why it is best to offer our TFT displays without controllers included.