Capacitive Touch Panel TFT LCD Modules 3.9 - RFS39AB-ALW-DNG
Capacitive Touch Panel TFT LCD Modules 3.9 - RFS39AB-ALW-DNG

Capacitive Touch Panel Bar TFT LCD Display Module 3.9"


RFS39AB-ALW-DNG is a TN transmissive type color active matrix 480×128 bar TFT LCD display module. The size of the active area is 3.9” diagonal with module dimension 105.5×37 mm. This 3.9-inch Bar type LCD display uses HX8278-A driver IC supporting 24-bit RGB interface. It’s brightness (typical value) is 400 cd/㎡, and contrast ratio (typical value) is 500:1. RFS39AB-ALW-DNG is a TFT module with PCAP touch allowing 5-point touch. The built-in IC for PCAP is GT911.

Power voltage ranges from 3.0V-3.6V; typical value is 3.3V. The module works within the temperature -20 to +70℃, storage temperature covers from -30 to +80℃.

Inquiry or Demo Code Datasheet Back Previous Next
  • General Specs
  • Interface Pin Function
  • Contour Drawing
  • Absolute Maximum Ratings
  • Electrical Characteristics
Item Dimension Unit
Size (Diagonal) 3.9 inch
Dot Matrix / Resolution 480 × 128 × RGB (TFT) dots
Module Dimension 105.5(W) × 37.0(H) × 5.13(D) mm
Active Area 95.04 × 25.34 mm
Dot / Pixel Pitch 0.066(W) × 0.198(H) mm
LCD Type TFT, Normally White, Transmissive
View Direction 6 o’clock
Gray Scale Inversion Direction 12 o’clock
Aspect Ratio Bar Type
Backlight Type LED, Normally White
Control Board No
TFT Driver IC HX8278-A Or Equal
Interface RGB-24BIT (SYNC mode)
PCAP IC GT911 or equivalent
Detect Points 5 Points
Touch Panel Projected Capacitive Touch Screen, PCAP
Surface Glare
Brightness 400 cd/㎡
Mounting Hole No
Operating Temperature -20~+70 °C
Storage Temperature -30~+80 °C
TFT Series Bar Type TFT LCD

LCM PIN Definition

No. Symbol Description
1 VLED- Backlight LED Cathode
2 VLED+ Backlight LED Anode.
3 GND System Ground
4 VCC Power supply for logic operation
5~12 R0~R7 Data bus
13~20 G0~G7 Data bus
21~28 B0~B7 Data bus
29 GND System Ground
30 DCLK Pixel clock signal
31 DISP Display on/off control
32 HSYNC Horizontal Sync signal
33 VSYNC Vrtical Sync signal
34 NC No connection (Option DE)
35 NC No connection
36 GND System Ground
37 NC No connection (Option XR for RTP)
38 NC No connection (Option YD for RTP)
39 NC No connection (Option XL for RTP)
40 NC No connection (Option YU for RTP)

PCAP PIN Definition

Pin Symbol Function
1 VSS Ground for analog circuit
2 VDDT Power Supply : +3.0V
3 SCL I2C clock input
4 NC No connect
5 SDA I2C data input and output
6 NC No connect
7 /RST External Reset, Low is active
8 NC No connect
9 /INT External interrupt to the host
10 VSS Ground for analog circuit

Capacitive Touch Panel TFT LCD Modules 3.9 - RFS390B-ALW-DNG

Item Symbol Min Typ Max Unit
Operating Temperature TOP -20 70
Storage Temperature TST -30 80

Operating conditions

Item Symbol Condition Min Typ Max Unit
Supply Voltage For LCM VCC 3.0 3.3 3.6 V
Supply Current For LCM ICC 15 25 mA
Supply Voltage For Touch Logic VDDT 2.8 3.3 V

LED driving conditions

Item Symbol Min Typ Max Unit
Forward Current ILED 40 mA
Forward Voltage VLED+ 14 15 17 V
Backlight life time 50000 hr