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General Specification

4DLCD-35480320-IPS is a colour active-matrix LCD module incorporating amorphous silicon IPS TFT (Thin Film Transistor). It is composed of a colour TFT-LCD panel, driver IC, FPC and a backlight unit with/without a Resistive/Capacitive Touch Panel (RTP or CTP), and with/without Cover Lens Bezel (CLB). The module display area contains 320 x 480 pixels. This product accords with RoHS environmental criteria.

Part Number Details:

4DLCD - 4D Systems LCD Display

3548032 - 3.5-inch, 320 x 480 Resolution

RTP - Resistive Touch

CTP - Capacitive Touch

CLB - Cover Lens Bezel



  • RoHS compliant
  • LCD weight tolerance: ± 5%.


LCD Type TFT / Transmissive / IPS  
Size 3.5 Inch
Viewing Direction ALL
Display Mode Normally Black
LCD (W × H × T) 4DLCD-35480320-IPS: 54.66x 82.94 x 2.28 mm
4DLCD-35480320-IPS-RTP: 54.66x 82.94 x 3.6
4DLCD-35480320-IPS-CTP: 54.66 x 83.00 x 3.68
4DLCD-35480320-IPS-CTP-CLB: 72.10 x 104.20 x.3.68 (Including CLB)
Active Area (W × H) 48.96 × 73.44 mm
Dot Pitch (W × H) 0.2025 × 0.2025 mm
Number of Dots (Pixels) 320 (RGB) × 480  
Driver IC ILI9488  
Backlight Type 6 LEDs  
Surface Luminance 4DLCD-35480320-IPS: 320 (typical) cd/m2
4DLCD-35480320-IPS-CTP: 295 (typical)
4DLCD-35480320-IPS-CTP-CLB: 295 (typical)
Interface Type MCU-16bit/SPI  
Color Depth 262K  
Pixel Arrangement RGB Vertical Stripe  
Surface Treatment AG  
Input Voltage 2.8 (typical) V
With/Without TP 4DLCD-35480320-IPS- Without TP
4DLCD-35480320-IPS-RTP – With Resistive Touch
4DLCD-35480320-IPS-CTP - With Capacitive Touch
4DLCD-35480320-IPS-CTP-CLB - Capacitive Touch CLB
Weight 4DLCD-35480320: 19.4 g
4DLCD-35480320 - RTP: 28.6
4DLCD-35480320 - CTP: 38.0
4DLCD-35480320 - CTP-CLB: 43.4

TFT LCD Display Drawing (Non-Touch Version)

TFT LCD Display Drawing

TFT LCD Display Drawing (Resistive Touch Version)

TFT LCD Display Drawing

TFT LCD Display Drawing (Capacitive Touch Version)

TFT LCD Display Drawing

TFT LCD Display Drawing (Capacitive Touch Version with Cover Lens Bezel)

TFT LCD Display Drawing

Absolute Maximum Ratings

Absolute Maximum Ratings

Supply Voltage for LCD Logic VDD/VCC -0.3 4.6 V
Input Voltage for Logic VIN VSS-0.5 VDD V
LED forward voltage (each LED) IF - 25 mA
Operating Temperature TOP -20 70 °C
Storage Temperature TST -30 80 °C
Humidity RH - 90% (Max60°C) RH

Electrical Characteristics

Electrical Characteristics

Power Voltage (Logic) VDD/DCC 2.6 2.8 3.3 V
Input Current (Logic) IVDD - 13 - mA
Input Voltage ‘H’ Level VIH 0.7 VDD - VDD V
Input Voltage ‘L’ Level VIL 0 - 0.3 VDD V

Electro-Optical Characteristics

Electro-Optical Characteristics

Response Time Tr+Tf θ=0 - 30 40 ms see figure
Contrast Ratio Cr ° - 1000 - - see figure
Luminance Uniformity δ WHITE ∅=0 60 70 - % see figure
Surface Luminance Lv 4DLCD-35480320-IPS - 320 - cd/m2 see figure
4DLCD-35480320-IPS-RTP - 270 - cd/m2
4DLCD-35480320-IPS-CTP - 295 - cd/m2
4DLCD-35480320-IPS-CTP-CLB - 295 - cd/m2
Viewing Angle Range θ ∅ = 90° - 80 - deg see figure
θ ∅ = 270° - 80 - deg
θ ∅ = 0° - 80 - deg
θ ∅ = 180° - 80 - deg
CIE (x,y) Cromacity Red: x 0.655
Red: y 0.317
Green: x θ=0° 0.260
Green: y ∅=0° -0.03 0.571 +0.03 see figure
Blue: x Ta=25 0.144
Blue: y 0.074
White: x 0.304
White: y 0.327

Backlight Characteristics

Backlight Characteristics

Voltage for LED backlight (Each LED) Vl - 3.2 3.4 V
Current for LED backlight (Each LED) Il-each - 20 25 mA
Current for LED backlight (Total – 6 LEDS) Il - 120 150 mA
LED Lifetime (50% of original brightness) - 30000 - - Hrs


The LED lifetime is defined as the module brightness decreasing to 50% original brightness at Ta=25°C.

  1. Contrast Ratio(CR) is defined mathematically as below, for more information see figure.

    Contrast Ratio

  2. Surface luminance is the LCD surface from the surface with all pixels displaying white. For more information, see figure.

    Surface Luminance

  3. The uniformity in surface luminance δ WHITE is determined by measuring luminance at each test position 1 through 5, and then dividing the maximum luminance of 5 points luminance by the minimum luminance of 5 points luminance. For more information, see figure.

    δ WHITE

  4. Response time is the time required for the display to transition from white to black (Rise Time, Tr) and from black to white (Decay Time, Tf). For additional information see Figure 1. The test equipment is the Autronic-Melchers ConoScope series.

  5. CIE (x, y) chromaticity, the x and y value is determined by measuring luminance at each test position 1 through 5, and then making the average value.
  6. Viewing angle is the angle at which the contrast ratio is greater than 2. For the TFT module, the contrast ratio is greater than 10. The angles are determined for the horizontal or x-axis and the vertical or y-axis to the z-axis which is normal to the LCD surface. For more information, see figure.
  7. For viewing angle and response time testing, the testing data is based on the Autronic-Melchers ConoScope series. Instruments for Contrast Ratio, Surface Luminance, Luminance Uniformity, and CIE the test data is based on TOPCONs BM-5 photodetector.

The definition of response time

The definition of response time

Measuring method for Contrast ratio, surface luminance, Luminance uniformity, CIE (x, y) chromaticity

Measuring method for Contrast ratio, surface luminance, Luminance uniformity, CIE (x, y) chromaticity

The definition of viewing angle

The definition of viewing angle

Interface Descriptions

LCD Interface

1 GND Ground
2 GND/(SDI) Ground for MCU mode/ Serial Data Input signal for SPI mode
3 MODE MCU-16bit /SPI mode selection pin Note 1
4 FMARK Tearing effect output signal
5 YD/CTP_INT The touch panel Y bottom pin for RTP / Interrupt signal from CTP/No Connection (NC) for Non touch Version Note 3
6 XL/CTP_SCL The touch panel X left pin for RTP/ I2C SCL for CTP / No Connection (NC) for Non touch Version Note 3
7 RESET Reset input signal
8 RS/SCL Instruction Register/Data Register selection pin for MCU mode / SPI Serial Clock for SPI mode
9 CS Chip select input pin
10 RD/(VCC) Read signal for MCU mode / Tie to VCC for SPI mode
11 WR/(D/C) Write signal for MCU mode / Data or Command selection for SPI mode
12 VCC Power supply (Logic)
13 NC/(SDO) No Connect for MCU mode / Serial Data Output for SPI mode
14 GND Ground
15 DB15/(GND) Databus DB15 for MCU mode / Tie to GND for SPI mode Note 2
16 DB14/(GND) Databus DB14 for MCU mode / Tie to GND for SPI mode Note 2
17 DB13/(GND) Databus DB13 for MCU mode / Tie to GND for SPI mode Note 2
18 DB12/(GND) Databus DB12 for MCU mode / Tie to GND for SPI mode Note 2
19 DB11/(GND) Databus DB11 for MCU mode / Tie to GND for SPI mode Note 2
20 DB10/(GND) Databus DB10 for MCU mode / Tie to GND for SPI mode Note 2
21 DB9/(GND) Databus DB9 for MCU mode / Tie to GND for SPI mode Note 2
22 DB8/(GND) Databus DB8 for MCU mode / Tie to GND for SPI mode Note 2
23 DB7/(GND) Databus DB7 for MCU mode / Tie to GND for SPI mode Note 2
24 DB6/(GND) Databus DB6 for MCU mode / Tie to GND for SPI mode Note 2
25 DB0/(GND) Databus DB0 for MCU mode / Tie to GND for SPI mode Note 2
26 DB1/(GND) Databus DB1 for MCU mode / Tie to GND for SPI mode Note 2
27 DB2/(GND) Databus DB2 for MCU mode / Tie to GND for SPI mode Note 2
28 DB3/(GND) Databus DB3 for MCU mode / Tie to GND for SPI mode Note 2
29 DB4/(GND) Databus DB4 for MCU mode / Tie to GND for SPI mode Note 2
30 DB5/(GND) Databus DB5 for MCU mode / Tie to GND for SPI mode Note 2
31 YU/CTP_RST The touch panel Y up pin for RTP / Reset pin for CTP / No Connection (NC) for Non touch Version Note 3
32 XR/CTP_SDA The touch panel X right pin for RTP / I2C SDA Pin for CTP / No Connection (NC) for Non touch Version Note 3
33 LEDA Anode of LED Backlight
34 LEDK1 Cathode1 of LED Backlight
35 LEDK2 Cathode2 of LED Backlight
36 LEDK3 Cathode3 of LED Backlight
37 LEDK4 Cathode4 of LED Backlight
38 LEDK5 Cathode5 of LED Backlight
39 LEDK6 Cathode6 of LED Backlight
40 GND Ground


  1. Interface Mode Selection (pin 3)

    Value Interface Remark
    0 MCU 16bit Databus:DB0~DB15
    1 SPI 4 wire SPI Mode
  2. Pins 15 to 30 are grounded on SPI mode.

  3. Pins 5, 6, 31 and 32 are only applicable to touchscreen displays (4DLCD-xxxxxxxx-RTP).

LCD Interface Descriptions


The pinout of this 3.5" display differs from the pinout on 2.4", 2.8" and 3.2" displays, for just the SPI Mode (Pin8 and Pin11), so if working with 2.4", 2.8" and 3.2" displays in the 4DLCD family, take note that the MCU mode pinout is the same and backward compatible, but SPI pinout is not identical.

CTP Interface

The Capacitive Touch is driven by a Focaltech FT5446 capacitive touch driver IC, which utilizes an I2C interface, and is capable of 5-point touch.

Backlight Example Circuit

The backlight circuit can be easily driven off a 5V supply. The voltage needs to be higher than the forward voltage of the LEDs and other drops in the circuit, which can be found in the Interface Descriptions section. A 3.3V supply typically does not meet this requirement, so a 5V supply is normally used.

In this circuit, a simple transistor is used to switch each of the LEDs on, where each LED is current-limited through its resistor. The transistor base can be PWM'ed if required (Label BACKLIGHT below), to give dimming control. An example PWM frequency that could be used is 3Khz, however, it is up to the Designer to determine what is suitable for the application.

The resistance feeding each LED can be calculated using Ohms Law, V=I x R.
We want to calculate R, so R=V/I

Supply Voltage = 5V

LED Forward Voltage = 3.2V (see the Interface Descriptions section)

Estimated voltage drop over transistor = 0.3V

Target current per LED = 20mA to 25mA (use 22mA in this example) (See the Interface Descriptions section)

Formula is then R = (5V-3.2V-0.3V) / 0.022A = 68ohms for each LED (LEDK1 to LEDK6)

Backlight Example Circuit

Initialisation Code

//*********Hardware reset*********// 

//********Start Initial Sequence*******//
WriteComm(0xE0); //P-Gamma

WriteComm(0XE1); //N-Gamma



WriteComm(0xC5);   //VCOM


WriteComm(0x3A); //Interface Mode Control

WriteComm(0xB0);  //Interface Mode Control  

WriteComm(0xB1);   //Frame rate 70HZ  


WriteComm(0xB6); //RGB/MCU Interface Control




LCD Timing Details

Timing Chart

Timing Chart

DCX tast Address setup time 0 - ns
taht Address hold time (Write/Read) 0 - ns
CSX tchw CSX "H" pulse width 0 - ns
tcs Chip Select setup time 15 - ns
trcs Chip Select setup time (Read ID) 45 - ns
trcsfm Chip Select setup time (Read FM) 355 - ns
tcsf Chip Select Wait time (Write/Read) 10 - ns
WRX twc Write cycle 66 - ns
twrh Write Control Pulse H duration 15 - ns
twrl Write Control Pulse L duration 15 - ns
RDX(FM) trcfm Read cycle (FM) 450 - ns
trdhfm Read Control Pulse H duration (FM) 90 - ns
trdlfm Read Control Pulse L duration (FM) 355 - ns
RDX(ID) trc Read cycle (ID) 160 - ns
trdh Read Control Pulse H duration 90 - ns
trdl Read Control Pulse L duration 45 - ns
D[17:0] tdst Write data setup time 10 - ns
tdht Write data hold time 10 - ns
trat Read access time - 40 ns
Tratfm Read access time - 340 ns
trod Read output disable time 20 80 ns


Timing parameter (VDD=3.3V, GND=0V, Ta=25˚C)

Reset Timing

Reset Timing

RESET tRW Reset low pulse width 10 - us
tRT Reset complete time - 5 (note1) ms
- 120 (note2) ms


  1. When reset is applied during SLPIN mode.
  2. When reset applied during SLPOUT mode.

Power On Sequence

Case 1 - RES line is held High or Unstable by Host at Power ON

RES line is held High or Unstable by Host at Power ON

Case 2 - RES line is held Low by Host at Power ON

RES line is held Low by Host at Power ON

Power-off Sequence - Uncontrolled Power Off

Uncontrolled power off is a situation where power is removed unexpectedly, e.g. a battery powering a device is disconnected without using the controlled power off sequence. There will not be any damage to the display module, nor will the display module cause any damage to the host. During an uncontrolled power-off event, ILI9341V will force the display to blank its content and there will not be any further abnormal visible effects on the display after 1 second of the power being removed. The display will remain blank until the Power On Sequence occurs.

Reliability Test

Reliability Test

1 High Temperature Storage 80˚C±2˚C 96H
Restore 2H at 25˚C
Power off
2 Low Temperature Storage -30˚C±2˚C 96H
Restore 2H at 25˚C
Power off
3 High Temperature Operation 70˚C±2˚C 96H
Power on
4 Low Temperature Operation -20˚C±2˚C 96H
Power on
5 High Temperature & Humidity Operation 60˚C±2˚C
90%RH 96H
Power on
After test cosmetic and electrical defects should not happen.
6 Temperature Cycle -20˚C←→25˚C←→70˚C
30min 5min 30min

After 10 cycles, restore 2H at 25˚C
Power off
7 Vibration Test 10Hz~150Hz, 100m/s2, 120min
8 Shock Test Half-sinewave, 300m/s2, 11ms


The Displays are of the highest rated 'Grade A', which allows for 0-4 defective pixels. A defective pixel could be solid Black (Dead), White, Red, Green or Blue.

Precautions for Using LCD Modules

Handing Precautions

  • The display panel is made of glass and a polarizer. The glass is fragile. It tends to be chipped during handling, especially on the edges. Please avoid dropping or jarring. Please be careful not subject it to a mechanical shock by dropping it on impact.
  • If the display panel is damaged and the liquid crystal substance leaks out, be sure not to get any of it in your mouth. If the substance contacts your skin or clothes, wash it off using soap and water.
  • Do not apply excessive force to the display surface or the adjoining areas since this may cause the color tone to vary. Do not touch the display with bare hands. This will stain the display area and degrade insulation between terminals (some cosmetics are determined by the polarizer).
  • The polarizer covering the display surface of the LCD module is soft and easily scratched. Handle this polarizer carefully. Do not touch, push or rub the exposed polarizer with anything harder than an HB pencil lead (e.g., glass, tweezers, etc.). Do not put or attach anything to the display area to avoid leaving marks on it. Condensation on the surface and contact with terminals due to cold temperatures will damage, stain or contaminate the polarizer. After products are tested at low temperatures they must be warmed up in a container before coming into contact with room-temperature air.
  • If the display surface becomes contaminated, breathe on the surface and gently wipe it with a soft dry cloth. If it is heavily contaminated, moisten the cloth with one of the following solvents
    • Isopropyl alcohol
    • Ethyl alcohol Do not scrub hard as it might damage the display surface.
  • Solvents other than those mentioned above may damage the polarizer. Especially the following.
    • Water
    • Ketone
    • Aromatic solvents Wipe off saliva or water drops immediately, contact with water over a long period may cause deformation or color fading. Avoid contact with oil and fat.
  • Take necessary precautions to minimize corrosion of the electrode. Corrosion of the electrodes is accelerated by water droplets, moisture condensation or current flow in a high-humidity environment.
  • Install the LCD Module by using the mounting holes. When mounting the LCD module, make sure it is free of twisting, warping and distortion. In particular, do not forcibly pull or bend the I/O cable or the backlight cable.
  • Do not attempt to disassemble or process the LCD module.
  • NC terminal should be open. Do not connect anything to it.
  • If the logic circuit power is off, do not apply input signals.
  • Control Electro-Static Discharge. Since this module uses a CMOS LSI, the same careful attention should be paid to electrostatic discharge as for an ordinary CMOS IC. To prevent the destruction of the elements by static electricity, ensure that an optimum work environment is maintained.
    • Before removing the LCM from its packing case or incorporating it into a set, be sure that the module and your body have the same electric potential. Be sure to ground your body when handling the LCD modules.
    • To reduce the amount of static electricity generated, do not conduct assembly and other work under dry conditions. To reduce the generation of static electricity, please ensure that the air in the work environment is not too dry. Relative humidity of 50%-60% is recommended. As much as possible, make the electric potential of your work clothes and that of the workbench the ground potential.
    • The LCD module is coated with a film to protect the display surface. Be careful when peeling off this protective film since static electricity may be generated.
  • Since the LCM has been assembled and adjusted with a high degree of precision, avoid applying excessive shocks to the module or making any alterations or modifications to it.
    • Do not alter, modify or change the shape of the tab on the metal frame.
    • Do not make extra holes on the printed circuit board, modify its shape or change the positions of the components to be attached.
    • Do not damage or modify the pattern writing on the printed circuit board.
    • Do not modify the zebra rubber strip (conductive rubber) or heat seal connector.
    • Do not drop, bend or twist the LCM.

Storage Precautions

When storing the LCD modules, the following precautions are necessary.

  • Store them in a sealed polyethylene bag. If properly sealed, there is no need for the desiccant.
  • Store them in a dark place. Do not expose to sunlight or fluorescent light, keep the temperature between 0℃ and 35℃, and keep the relative humidity between 40%RH and 60%RH.
  • The polarizer surface should not come in contact with any other objects. (We advise you to store them in an anti-static electricity container in which they were shipped. Some Liquid crystals solidify under low temperatures (below the storage temperature range) leading to defective orientation or the generation of air bubbles (black or white). Air bubbles may also be generated if the module is subjected to low temperatures.
  • If the LCD modules have been operating for a long time showing the same display patterns, the display patterns may remain on the screen as ghost images and a slight contrast irregularity may also appear. A normal operating status can be regained by suspending use for some time. It should be noted that this phenomenon does not adversely affect performance reliability.
  • To minimize the performance degradation of the LCD modules resulting from the destruction caused by static electricity etc., please avoid holding the following sections when handling the modules’
    • The exposed area of the printed circuit board
    • Terminal electrode sections

Revision History

Document Revision

1.0 14/06/2021 Initial Version
1.1 24/06/2021 Added pin 12 logic current consumption data, added backlight driving circuit example
1.2 21/07/2021 Updated Init Codes to fix issue with colours
1.3 20/01/2023 Modified datasheet for web-based documentation