Round TFT LCD Displays For OEM Products
Quick answer: a round TFT LCD is a color active-matrix LCD whose visible area is a circle instead of a rectangle. The host normally still sends a square frame, such as 240 × 240 or 480 × 480 pixels, and only the circular area is visible. Small round TFTs usually connect over SPI or an MCU bus; larger ones use parallel RGB or MIPI DSI.
Round screens suit dial-style products such as smart-home knobs, appliance controls, gauges and wearables. Plan the user interface, cover lens and mounting around the circle from the start.
SuccessLCD Round TFT References
| Reference | Size | Resolution | Interface | Notes |
|---|---|---|---|---|
| S130MH2ZG-03 | 1.3-inch round | 240 × 240 | SPI / RGB / MCU | Reference body 35.9 × 39.7 mm; no fitted touch |
| COM31H3P76ULC | 3.1-inch round | 480 × 480 | 24-bit parallel RGB, 50-pin FPC | VA normally-black a-Si TFT; 78.62 mm active-area diameter; source specification is marked tentative |
Final configuration, touch, cover lens and controlled specification are confirmed for each project.
Designing Around A Circular Screen
- User interface. Keep text and touch targets inside a safe circle; content placed in the square frame’s corners is not visible. Dial, ring and radial menus use the shape best.
- Cover lens and bezel. A round cover glass with a printed border hides the edge of the active area. Define the printed window, glass thickness and surface treatment together; see touch panels and cover lenses.
- Touch. Round PCAP sensors are tuned with the final cover lens. If the input type is open, compare capacitive and resistive touch.
- Mounting and FPC. Check the FPC exit, bending radius and how the module is held without pressing on the active area.
- Readability. For bright environments, review brightness, reflection and optical bonding.
Choosing The Interface
SPI and MCU interfaces need few host pins and suit small displays and microcontrollers, but the refresh speed depends on the bus clock and frame size. Parallel RGB and MIPI DSI carry more data for larger round screens and smooth animation, and need a host with a matching display controller. Compare host support with the TFT LCD interface guide.
Round TFT LCD FAQs
Is a round TFT display really round, or a square display with a mask?
The visible active area is circular. The display controller is normally still addressed with a square frame, and pixels outside the circle are not shown, so graphics should be designed for the circular area.
What resolution do round TFT displays use?
Common formats are square pixel frames such as 240 × 240 on small displays and 480 × 480 on larger ones. S130MH2ZG-03 uses 240 × 240 and COM31H3P76ULC uses 480 × 480.
Can a round TFT have a touch panel?
Yes. A round capacitive touch sensor and cover lens can be added, with the controller tuned for the final stack. S130MH2ZG-03 is listed without fitted touch, so touch is defined for the project.
Which interface should I choose for a round TFT?
For a small display driven by a microcontroller, SPI or MCU is usually simplest. For larger screens or video-like animation, parallel RGB or MIPI DSI provides more bandwidth if the host supports it.
What should I send for a round TFT quotation?
Send the size and resolution, interface, touch and cover lens needs, brightness target, operating environment, mechanical limits and expected quantity. See what to include in a TFT LCD module RFQ.
Planning a round display? Compare options with the small TFT LCD comparison guide, browse TFT LCD module references or send your round TFT requirements for an engineering review. For a custom outline, cover lens or FPC, see custom TFT display options.