4.0 Inch Round TFT LCD Module

ENH-TV0400A002 Description

 

What's Actually Inside This 4.0" Round LCD?

Let me open with the raw specs (the kind of numbers our engineers check first):

Screen size – 4.0 inch, true circle (active area Φ101.52 mm, not cropped)

Resolution – 720×720, ~280 PPI (sharp enough for small text and icons)

Module outline – 105.60 mm (H) × 109.87 mm (W) × 2.23 mm (T)

Interface – 4‑lane MIPI DSI (40‑pin FPC)

Viewing angle – IPS, full 178° all directions

Driver IC – JD9365DA (mature, used in thousands of projects from 4″ to 10.1″)

Standard brightness – 350 cd/m², but we can push it up to 1200‑1500 cd/m² for outdoor use

How does it perform in real life?
The JD9365DA driver IC is not the newest or flashiest, but that's exactly why we like it – it's rock‑solid. We've shipped this driver on circular and rectangular panels to customers making EV dashboards, smart coffee machines, and even marine equipment. No weird compatibility issues with Qualcomm, Rockchip, or STM32 platforms.

And the 4‑lane MIPI DSI interface? It's fast enough for smooth animations (think radial menus or circular progress bars). One of our clients – a European e‑bike brand – told us: "We didn't want to redesign our whole mainboard just for the display." With MIPI, they didn't have to.

 

 Key Features That Actually Matter to Product Designers

I won't list bullet points for the sake of listing. Instead, here's what engineers ask about most when they see our 4.0 Inch Round TFT LCD Module:

True circular, not a masked rectangle

Yes, you can buy a square 720×720 panel and cover the corners with black paint. But that gives you uneven edge brightness and wastes pixels. Ours is designed as a circle from the glass level – uniform backlight, no dark spots at 3 o'clock or 9 o'clock.

IPS – because someone will always look from the side

In a car dashboard, the driver sees it straight, but the passenger glances from an angle. In a smart thermostat mounted on the wall, you might read it while walking sideways. IPS means colors don't wash out. We've tested it up to 178°, and it holds up.

Temperature range: -20℃ ~ +70℃ (operating)

Standard industrial grade. For automotive clusters or outdoor kiosks, we can offer an extended range. Last year we made a batch for a Russian agricultural equipment company – their machines work in -30°C winters. We adjusted the backlight and LCD materials accordingly.

Optional high brightness (up to 1500 cd/m²)

The standard 350 nits is fine for indoors. But if you're building a motorcycle dashboard or a portable marine GPS, you'll want 1000+ nits. We've done 1500 nits before – yes, it draws more power, but it's readable under direct sunlight. We usually recommend optical bonding together with high brightness for the best outdoor experience.

 

Where Are People Actually Using This Round Display?

Not just "potential applications" – here are real projects we've shipped for in the past 6 months:

EV and e‑bike dashboards – A French startup took 2000 units with 1200 cd/m² brightness and a custom anti‑reflective cover glass. They use it to show speed, battery %, and navigation arrows.

Smart thermostats – An American HVAC brand replaced their old 2.8″ round screen with our 4.0″ because they wanted a larger touch area for climate control. They use optical bonding for a "glue‑free" look.

Industrial knob controllers – A German machine tool maker integrates our display into a rotary encoder panel. The 720×720 resolution lets them show real‑time G‑code previews.

Patient monitors – A Chinese medical device company uses the IPS version for bedside monitors; nurses read it from the door, and the wide viewing angle is a must.

Of course, you can also use it for smartwatches, coffee machines, and even fancy vape mods (yes, we've seen that too). The 4.0 Inch Round TFT LCD Module is surprisingly versatile.

 

Mechanical & Electrical Details – What You Need Before Ordering Samples

Let me give you the exact numbers our factory uses when cutting the FPC and assembling the backlight.

Outline dimensions
105.60 mm (width) × 109.87 mm (height) × 2.23 mm (thickness) – slim enough for handheld devices. The active circle is Φ101.52 mm, leaving about 4 mm bezel area on each side.

40‑pin MIPI DSI pinout (simplified)

4‑lane MIPI data pairs (TDP0/TDN0 – TDP3/TDN3)

VCI = 2.8V (analog), IOVCC = 1.8V (logic)

RESET and TE (tearing effect) pins

LED backlight anode/cathode (constant current)

For the full pin description and timing diagrams, please request the official datasheet – I can send it as a PDF.

Touch panel integration
We can add a capacitive touch panel (CTP) with either air bonding (cheaper) or optical full lamination (better readability and durability). The CTP uses I²C interface with its own power lines (TP_VCI, TP_IOVCC) and interrupt/SCL/SDA. If you need a specific cover glass shape or anti‑fingerprint coating, just tell us.

Here's a photo from our production line last week: [Image placeholder – COG bonding of JD9365DA on 4.0" round glass]. I can send the actual picture via email.

 

Quality & Factory Credentials – Because You Need to Trust Your Supplier

We are a factory‑direct manufacturer of small to medium LCD modules, not a trading company. Our ISO9001:2015 and IATF 16949 (automotive) certificates are available for download upon request. Also RoHS and REACH compliant – no surprises.

Manufacturing highlights

Fully automated COG (Chip‑on‑Glass) and FPC bonding lines

100% inspection + 24‑hour aging test before shipment

Monthly capacity: >500k units for this size class

Our engineering team doesn't just hand you a datasheet and disappear. We have a WeChat / WhatsApp group for every major customer. Need help with initialization code? Our firmware engineer Jack usually replies within a few hours.

 

 Customization – Almost Everything Can Be Changed

 

Typical customization process
① You send your mechanical drawing and electrical requirements.
② Our engineers review feasibility (3‑5 days).
③ Prototype samples (4‑6 weeks).
④ Validation testing (we can simulate your environmental conditions).
⑤ Mass production.

Last month we completed a custom FPC for a Japanese robotics company – they needed a 90° bent tail to fit inside a narrow arm joint. It took 7 weeks from drawing to sample approval.

 

 

 ● OEM&ODM             ● NO MOQ                ● SAMPLES IN STOCK              ● TESTING BOARD OPTIONAL

 

 

 

 

                                                           

 

 

 

SPECIFICATIONS

ITEM	DIMENSION	UNIT
Size	4.0	inch
Outline Dimention	109.87x105.6x2.23	mm
Operating Temperature	-20°- +70°	°C
Storage Temperature	-30°- +80°	°C
Resolution	720x720

 

 

 

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