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4.0 Inch Round Display 720*720 Resolution LCD with MIPI Interface

Name: 4.0 Inch Round Display 720*720 Resolution LCD with MIPI Interface
Brand: FANNAL
Rating: 5.0 (88 reviews)

4.0-inch Round TFT LCD Display

Model:
FN0400D002A
Brand:
FANNAL
Size(inch):
4
Display AA(mm):
101.52*101.52
Operation Temp(℃):
-20~70
Storage Temp(℃):
-30~80
Resolution:
720x720
Direction:
ALL
Interface:
MIPI
Brightness(cd/m²):
250
Touch Screen:
Customizable

Quantity:
Availability:





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Features

Drawing & Specifications

Customizations

Application

FAQ

详情页IPS工控

4.0 inch TFT display, 720x720, MIPI, Industrial LCD Screen, 250cd/m²

This 4.0 inch is developed with a standard 720x720 high-resolution IPS screen and MIPI interface. A 4-inch small-sized, round TFT display is perfect for applications requiring both compactness and a unique design aesthetic. This type of display is commonly used in automotive instrument clusters, medical devices, and smart home controls. Its circular shape offers a distinctive look while maintaining full functionality, making it ideal for interfaces that display key information like speedometers, health metrics, or control dials. With vibrant colors, sharp contrast, and wide viewing angles, this display ensures excellent readability from various perspectives, while its small size allows for seamless integration into space-constrained devices or dashboards.

Features

True Circular Round Display Design

This 4.0 inch round display features a true circular active area, enabling seamless integration into products that require a non-rectangular, visually balanced interface. The round form factor enhances UI aesthetics and supports intuitive, radial-style layouts.

High Resolution 720×720 LCD Panel

With a 720×720 resolution, this round display delivers sharp text, smooth graphics, and clear icon rendering. The square pixel layout is optimized for circular screens, minimizing distortion and maximizing effective display area.

MIPI Interface for Embedded Systems

The MIPI interface supports high-speed data transmission and efficient integration with modern embedded processors, making this round display suitable for compact and performance-oriented device designs.

Compact 4.0 Inch Size for Space-Efficient Designs

The 4.0 inch diagonal size strikes a balance between visibility and compactness, allowing the round display to fit into handheld devices, control units, and embedded systems with limited front-panel space.

Industrial-Grade LCD Reliability

Designed for professional and industrial use, this round display delivers stable performance for embedded devices that require long-term operation and consistent display output.

Drawing

Specifications

General Specifications

LCD size(inch):	4.0 (Diagonal)
Resolution:	720(H) × 720(V)
Pixel Pitch:	0.141(H)x0.141(V)
Active Area(mm):	101.52(H)×101.52(V)
Module Size(mm):	105.6(W)x109.87(H) × 2.08(D)
Display Mode(mm):	Normally Black, Transmissive
Interface:	MIPI
Pixel arrangement:	RGB-Vertical Stripe
View Direction:	ALL
Power Supply(V):	2.8
Power Consumption(W):	0.25(Typ.)
Weight(g):	41(Typ.)
Luminance(cd/m2):	250(Typ.)
Operating Temperature(°C):	-20~+70
Storage Temperature(°C):	-30~+80

Interface

Pin No.	Symbol	I/O	Description
1	LEDA	P	LED Anode.
2-3	LEDK	P	LED Cathode.
4	VCI	P	Power Supply 2.8V.
5	IOVCC	P	LCD I/O power supply 1.8V.
6	RESET	I	Reset pin
7	TE	I	Tearing effect 1.8V.
8	NC	-	NO connection.
9	GND	P	Ground.
10	D0P	I	MIPI DSI differential data pair(Data lane 0+)
11	D0N	I	MIPI DSI differential data pair(Data lane 0-)
12	GND	P	Ground.
13	D1P	I	MIPI DSI differential data pair(Data lane 1+)
14	D1N	I	MIPI DSI differential data pair(Data lane 1-)
15	GND	P	Ground.
16	CLKP	I	MIPI DSI differential clock pair.
17	CLKN	I	MIPI DSI differential clock pair.
18	GND	P	Ground.
19	D2P	I	MIPI DSI differential data pair(Data lane 2+)
20	D2N	I	MIPI DSI differential data pair(Data lane 2-)
21	GND	P	Ground.
22	D33P	I	MIPI DSI differential data pair(Data lane 3+)
23	D3N	I	MIPI DSI differential data pair(Data lane 3-)
24	GND	P	Ground.
25	TP_INT	I	Touch Interrupt, No Connection.
26	TP_SDA	I	Touch IIC Data signal, No Connection.
27	TP_SCL	I	Touch IIC Clock signal, No Connection.
28	TP_RESET	I	Touch Reset Signal, No Connection.
29	TP_VCL	P	Touch Power supply, No Connection.
30	NC	-	NO connection.

Electrical Characteristics

Parameter	Symbol:	Min.	Typ.	Max.	Unit
Forward Current Voltage	VF	8.4	9.3	9.9	V
Forward Current	IF	If	-	40	mA
Backlight Power Consumption	Wbl	-	0.124	-	W
LED Lifetime	-	30000	-	-	Hrs

Customization

● Custom Display Options

LCD Panel

• Size range: 1.77" to 15.6"
• Trusted panel partners: BOE, INNOLUX, JDI, Hannstar, CTC, TCL, and TIANMA.
• Panel types: IPS / TN / LTPS
• Operation Temperature: Industrial (-20 ~ 70°C), Automotive (-30 ~ 85°C)

Interface Design

• Tailored shape, length, and PIN definitions for full compatibility.
• EMI shielding and circuit optimisation.
• Supports multiple conversions: SPI, MCU, RGB, MIPI, LVDS, EDP

Back Light

• Module material options: metal/plastic/metal–plastic integration
• High brightness up to 30,000 cd/m², ideal for outdoor or industrial use.
• Long lifetime up to 50,000 hours.

Driver Board

• Options: RGB / VGA / HDMI / LVDS / DVI / Type-C
• Fully compatible with custom TFT and LCD modules.

• Optimised design for stable image transmission and performance.

● Custom Touchscreen Options

Touch Sensor

• Available Sizes: Up to 65"

• Structure Options: G+G, G+F+F, designed for industrial and automotive applications

• Touch Functions: Supports multi-touch, waterproof, glove touch, passive pen, gesture & palm rejection

• Operating Temperature:

Industrial Grade: –20°C ~ +70°C

Automotive Grade: –30°C ~ +85°

Touch Controller (IC)

• Touch tuning and firmware optimization provided by FANNAL (in-house FW design)
• Trusted IC partners: EETI, ILITEK, GOODiX, FocalTech, Cypress, Microchip(FANNAL's Design Partner)
• High Reliability: Excellent anti-interference and long-term stability
• EMC Design: Full electromagnetic compatibility engineering to meet EMI/RFI and industrial standards

Cover Lens

• Material Options:

Glass: 0.55mm–10.0mm
PMMA: 0.5mm–3.0mm
PC: 0.1mm–1.0mm
• Custom Design: CNC, Hot bending, 3D & 2.5D cover glass, ceramic printing, and PMMA integration
• Surface Treatments:
3A: AG / AR / AF
Anti-Microbial / Anti-Explosion

● Custom Optical Bonding Service

Optical Bonding	Size Range	Notes
OCA	Up to 15.6”	Two fully automated production lines for high-volume manufacturing
LOCA / OCR	Up to 32”	Excellent for high contrast and durability
Silicone	Up to 32”	Ideal for rugged, large-size industrial applications

Applications

1. Automotive Instrument Clusters & Auxiliary Displays

Why it fits:
The round display format naturally matches traditional gauge designs, making it suitable for automotive instrument clusters, auxiliary dashboards, and control interfaces.

Typical use cases:

Digital gauges
Mode indicators
Secondary vehicle information displays

2. Medical Devices & Healthcare Equipment

Why it fits:
The 720×720 resolution enables clear visualization of medical parameters, while the round display layout supports intuitive control interfaces.

Typical use cases:

Portable medical devices
Medical control panels
Device status and parameter displays

3. Industrial Control Interfaces

Why it fits:
Round displays are well-suited for rotary-style UI designs commonly used in industrial control systems.

Typical use cases:

Equipment control knobs
Status indicators
Machine operation panels

4. Smart Home & IoT Control Panels

Why it fits:
The compact round display enables elegant UI designs for smart home devices and IoT controllers.

Typical use cases:

Smart thermostats
Home automation controllers
Embedded IoT interfaces

5. Consumer & Wearable-Style Embedded Devices

Why it fits:
The round display supports modern, minimalistic designs often seen in consumer electronics and smart devices.

Applications of round display

FAQ

Q1: What are the primary applications for a 4.0-inch round LCD display?

Answer: Round displays are ideal for smart home controllers, automotive dashboard gauges, and high-end handheld medical devices. Their circular form factor provides a premium, modern aesthetic compared to traditional rectangular screens.

Q2: How do I adapt a rectangular UI to this 720x720 round resolution?

Answer: Most modern GUI frameworks (like LVGL or Qt) support circular masking and coordinate mapping. Since the hardware resolution is a 720x720 square, the UI engine simply hides the non-visible corner pixels.

Q3: Can the MIPI DSI interface be converted to HDMI or RGB?

Answer: Yes, by using a dedicated bridge IC (such as Toshiba or Lontium series), the MIPI signal can be converted to HDMI or RGB to support various controller boards. Custom driver boards are also available upon request.

Q4: Is this 4.0" round display readable in direct outdoor sunlight?

Answer: This display features high-brightness LED backlighting and IPS technology, ensuring wide viewing angles and excellent legibility even in bright environments. Optical bonding can be added to further reduce reflections.

Q5: Does the round touch panel support thick cover glass customization?

Answer: Yes, our PCAP touch technology can be tuned to work through customized cover glass up to 6mm thick, providing impact resistance (IK ratings) for industrial or outdoor applications.