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3.4 Inch Industrial Round Touch Display

Name: 3.4 Inch Industrial Round Touch Display
Brand: FANNAL
Rating: 5.0 (31 reviews)

3.4-inch round optical-bonded touch display with an 800 × 800 TFT, G+G capacitive touch, and 550 cd/m² typical TPM luminance. Its circular form factor is suited to compact interfaces where a conventional rectangular display does not fit the product design.

Model:
FN0340T002A
Brand:
FANNAL
Size(inch):
3.4
Cover OD (mm):
110.0(H)x110.0(V)x8.5(T)
Display AA(mm):
87.6(H)x87.6(V)
Operation Temp(℃):
-20~70
Storage Temp(℃):
-30~80
TP VA (mm):
88.2(H)x88.2(V)
Structure:
G+G
Resolution:
800×800
Display Interface:
MIPI
TP Interface:
IIC
Brightness(cd/m²):
550

Quantity:
Availability:





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Product Description

Drawing & Specifications

Applications

Customizations

FAQ

The FN0340T002A is a 3.4-inch round touch display combining an 800 × 800 TFT LCD with a G+G projected capacitive touch panel. The finished module uses optical bonding with OCA and provides 550 cd/m² typical TPM surface luminance. With a 110 × 110 mm overall size and a circular viewing area, it is intended for compact equipment and interfaces where the display shape is part of the product design.

The module uses MIPI for the display and I²C for touch communication. The chemically strengthened cover glass has a minimum surface hardness of 7H.

Features

Round Display Format

The circular form factor allows the display to be integrated into products where a conventional rectangular panel would leave unused space or conflict with the enclosure design. It can also be used where a circular user interface is part of the overall product appearance.

800 × 800 TFT Resolution

The 800 × 800 resolution provides a square pixel area that works naturally with the round active display region. It gives designers flexibility for circular menus, gauges, status indicators, and other graphical interfaces.

Optical Bonding with OCA

The touch panel and TFT are optically bonded using OCA. Removing the conventional air gap helps reduce internal reflections and can improve perceived image quality, particularly when the display is viewed under ambient lighting.

550 cd/m² Typical TPM Luminance

The specified 550 cd/m² typical luminance is measured on the finished TPM, rather than the TFT alone. This gives the module more usable brightness than a basic indoor touch display, although direct-sunlight readability still depends on the complete optical stack and installation environment.

G+G Capacitive Touch

The module uses a glass-on-glass touch structure with 5-point finger input. The cover glass is chemically strengthened and specified at ≥7H surface hardness, providing a relatively robust front surface for repeated touch operation.

Compact Mechanical Format

With an overall size of approximately 110 × 110 × 8.5 mm, the module is intended for applications where available panel space is limited and the display needs to fit within a compact enclosure.

Drawing

Specifications

Item	Specification	Unit / Remarks
TPM Active Size	3.4 inch (Diagonal)	Inch
TPM Outline Size	110.0(H)x110.0(V)x8.5(T)	mm
View Area	88.2(H)x88.2(V)	mm
Surface Hardness	≥7H	-
Surface Treatment	NA	-
Touch Transmittance	85% Min	-
Touch Driver IC / Controller	FocalTech	-
Touch Points	5	-
Touch Mode	Finger	-
Touch Interface	IIC	-
Operating Temperature	-20~70	°C
Storage Temperature	-30~80	°C
Humidity	10%~90%	-
TFT Part Number	FN0340D004A	pcs
TPM Surface Luminance	550(Typ.); 440(MIN)	cd/m2
TFT Interface	MIPI	-
TFT Resolution	800*800	-
Structure	G+G	-
Cover Thickness	2.9(CS)	mm
Sensor Thickness	0.55	mm
TFT Power Supply	2.8	V
Touch Power Supply	3.3	V
Light Transmittance	85% Min	-
Uniformity	80% Min	-
Channels of Sensor	TX13*RX13	-
Unmarked Tolerance	±0.3/±1°	-
Bonding Type	Optical Bonding	-
Bonding Material	OCA	-
Cover Enhancement Method	Chemical Strengthening	-
Environmental Requirements	RoHS-2.0, REACH	-

Applications

Compact HMI

The round display can be used for compact control interfaces where a circular screen provides a better fit than a conventional rectangular panel.

Instrumentation and Gauges

Its circular format is naturally suited to gauge-style interfaces, status indicators, measurement displays, and instrument panels.

Industrial Equipment

The module can be integrated into compact industrial equipment, controllers, and monitoring devices where touch input and a non-rectangular display format are required.

Professional and Embedded Devices

The display can also be considered for specialized embedded equipment, access terminals, control devices, and other products where the display shape is part of the mechanical or user-interface design.

Custom Product Interfaces

For OEM products with a circular front panel or enclosure, the module provides a starting point for integrating display and touch functions into the same assembly rather than designing around a standard rectangular LCD.

Customizations

● 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

FAQ

Why choose a round touch display instead of a standard rectangular display?

The main reason is mechanical and interface design. A round display can fit naturally into circular housings, instrument panels, gauges, and compact products where a rectangular screen would either waste space or require compromises in the enclosure design.

Does the 800 × 800 resolution mean the display is square?

No. 800 × 800 describes the TFT's pixel resolution, while the finished display has a circular viewing format. The square pixel matrix provides the underlying image area from which the circular display shape is defined.

Does optical bonding improve the display in bright environments?

Optical bonding can reduce reflections caused by the air gap between the touch panel and LCD and improve perceived contrast. It does not, by itself, make a display sunlight-readable. For outdoor use, the complete optical stack, cover glass, surface treatment, viewing angle, and ambient light should be evaluated together.

What should be considered when integrating this round display into a product?

The enclosure should account for the 110 × 110 mm module outline, circular viewing area, approximately 8.5 mm total thickness, and the location of the display and touch connections. The host system also needs to support the MIPI display interface and I²C touch interface. For a custom enclosure, the mechanical drawing should be reviewed before finalizing the mounting design.