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Generic RGB Display Adapter Board

 
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Overview

The aim of this article is to give a few display examples (40 pin interface) to the developers working on Toradex modules.

The Toradex module provides LCD interface(18/24-bit) which can be used to connect most of the RGB LCDs available in the market. On Apalis/Colibri Evaluation boards or Iris/Ixora/Viola carrier boards, a Unified Display Interface is provided to connect the RGB LCD to the [Article not found #100866].

EDT displays are available on our webshop, and are pin compatible with our boards.

In order to connect other manufacturers RGB LCDs, the following needs to be done:

  • Proper pin mapping of RGB signals.
  • Proper pin mapping of touch signals.
  • Back-light LED driver circuit with back-light on/off/dimming (PWM) feature.
  • Power management chip for different voltage generation in the LCD.

We have found the following 40 pin interface which many LCD manufacturers support (pin-outs mentioned below in the table), so we thought of doing an example display adapter board to make it easy for our customers.



Pinout Details

Following table list the 40 pin standard interface pinout, which is supported by many LCD manufacturers:

Pin No Name External Connection Function Description
1 LED- Power Supply Backlight Cathode(GND)
2 LED+ Power Supply Backlight Anode(GND)
3 GND Power Supply (GND)
4 VDD Power Supply Supply voltage for LCD and logic 3.3V
5-12 [R0-R7] MPU Red Data signals
13-20 [G0-G7] MPU Green Data signals
21-28 [B0-B7] MPU Blue Data signals
29 GND Power Supply (GND)
30 CLK MPU Pixel Clock
31 DISP MPU Display ON/OFF signal
32 HSYNC MPU Line synchronization signal
33 VSYNC MPU Frame synchronization signal
34 DE MPU Data Enable signal
35 NC - No Connect
36 GND Power Supply (GND)
37 X1/NC - Touch Signal/No Connect
38 Y1/NC - Touch Signal/No Connect
39 X2/NC - Touch Signal/No Connect
40 Y2/NC - Touch Signal/No Connect

Generic Display Adapter board can be used to connect these displays with Toradex Evaluation or carrier boards.

NOTE: Generic Display Adapter Board design is just an example, not fully optimized for production. Toradex do not manufacture these boards, but we have given all design data.Also change the over-voltage and current resistors on the display adapter board according to the backlight power requirements of the LCD to connect.



Block Diagram

Following block diagram represents, how to connect TFT LCD display to the Toradex Carrier board using Generic Display Adapter Board:



Board Images

Generic Display Adapter V1.0


Generic Display Adapter V2.1



Design Data

Generic Display Adapter V1.0


NOTE: For LCD backlight over-voltage and over-current limits, please choose the correct jumper settings depending on the display.

Generic Display Adapter V2.1


NOTE: Please note that this version of the Generic Display Adapter is only compatible with displays supporting 40 pin standard interface pinout, in which resistivetouch screen signals are also available on the same connector. Also customer need to assemble correct over-voltage resistor (R39) and over-current limit resistor (R42) depending on the display, please refer Generic Display Adapter schematic for more details.



Display Details

HAOYU Electronics

(40 Pin Standard Interface)

S.No Part no. Size Resolution Interface Touch
1 HY43-LCD 4.3" 480x272 24 Bit RGB 4W R Touch
2 HY5-LCD-HD 5.0" 800x480 24 Bit RGB 4W R Touch
3 HY7-LCD 7.0" 800x480 24 Bit RGB 4W R Touch
4 HY070CTP-A 7.0" 800x480 24 Bit RGB Cap Touch

EastRising

(40 Pin Standard Interface)

S.No Part no. Size Resolution Interface Touch
1 ER-TFT043-3 4.3" 480x272 24 Bit RGB 4W R Touch
2 ER-TFT050-2 5.0" 480x272 24 Bit RGB 4W R Touch
3 ER-TFT070-4 7.0" 800x480 24 Bit RGB 4W R Touch
  • We have tested some displays from EastRising. Download the Registry files from here.

Newhaven

(40 Pin Standard Interface)

S.No Part no. Size Resolution Interface Touch
1 NHD-4.3-480272EF-ATXL# 4.3" 480x272 24 Bit RGB No Touch
2 NHD-4.3-480272EF-ATXL#-T 4.3" 480x272 24 Bit RGB 4W R Touch
3 NHD-4.3-480272EF-ATXL#-CTP 4.3" 480x272 24 Bit RGB Cap Touch
4 NHD-5.0-800480TF-ATXL# 5.0" 800x480 24 Bit RGB No Touch
5 NHD-5.0-800480TF-ATXL#-T 5.0" 800x480 24 Bit RGB 4W R Touch
6 NHD-5.0-800480TF-ATXL#-CTP 5.0" 800x480 24 Bit RGB Cap Touch
7 NHD-7.0-800480EF-ATXL# 7.0" 800x480 24 Bit RGB No Touch
8 NHD-7.0-800480EF-ATXL#-T 7.0" 800x480 24 Bit RGB 4W R Touch (not compatible, see NOTE)
9 NHD-7.0-800480EF-ATXL#-CTP 7.0" 800x480 24 Bit RGB Cap Touch
10 NHD-7.0-800480EF-ATXV# 7.0" 800x480 24 Bit RGB No Touch
11 NHD-7.0-800480EF-ATXV#-T 7.0" 800x480 24 Bit RGB 4W R Touch (not compatible, see NOTE)
12 NHD-7.0-800480EF-ATXV#-CTP 7.0" 800x480 24 Bit RGB Cap Touch

NOTE:

  • Touch section is not compatible to adapter board LCD side 40 Pin connector(X7) due to touch signals not coming to 40 Pin flex cable, but via another four wire flex cable. We have for the same reason given another connector(X10) on adapter board which routes touch signals.
  • Download the Registry files from here.

Frida

(40 Pin Standard Interface)

S.No Part no. Size Resolution Interface Touch
1 FRD-TFT-43040P 4.3" 480x272 24 Bit RGB 4W R Touch
2 FRD-TFT-50040P 5.0" 480x272 24 Bit RGB 4W R Touch
3 FRD-TFT-70040P 7.0" 800x480 24 Bit RGB 4W R Touch

Download the Registry files from here.

DLC Display Co Ltd

S.No Part no. Size Resolution Interface Touch
1. DLC0700OZG 7.0 800x480 RGB24 No

Other manufacturers having 40 Pin Standard interface

Do you have any feedback or question?. Please send us an email at support@toradex.com