1.46 Inch Round TFT LCD Module

ENH-TV0146A003 Description

 

1. Product Specifications and Application Scenarios

Technical Parameters

LCD Size：1.46 inch (diagonal)

Panel Type：IPS (In-Plane Switching)

Resolution：360 × 360 pixels (RGB stripe)

Number of Colors：262K (18-bit)

Viewing Direction：Free (85/85/85/85 degrees typical)

Panel Active Area：36.94 × 36.94 mm

Driver IC：ST77916

Module Outline：Varies by FPC configuration (typical 39.24 × 41.01 × 1.60 mm)

Interface：QSPI (4-line SPI also available)

Pin Count：12 pins (QSPI version)

Operating Voltage：2.8V – 3.3V

Operating Temperature：-20°C ~ +70°C

Storage Temperature：-30°C ~ +80°C

Parameter Analysis and Applications

The 360×360 resolution on a 1.46-inch diagonal yields a pixel density of approximately 170 PPI, which provides sufficient clarity for 8-point text and detailed graphical elements at typical viewing distances (30–50 cm) for wearable and handheld devices. The 1:1 aspect ratio is particularly well-suited for circular watch faces, radial menu systems, and status indicators that benefit from symmetrical UI layouts.

The ST77916 driver IC represents an upgrade over the widely deployed ST7789 series. It supports an exceptionally broad interface portfolio including MCU 8-bit, RGB 6-bit, SPI, QSPI, and MIPI DSI. This interface flexibility allows designers to select the optimal connection scheme based on microcontroller capabilities and pin budget. The integrated on-chip GRAM eliminates the need for external frame buffers, reducing overall BOM cost and PCB complexity.

The IPS panel with free viewing direction ensures consistent color accuracy and contrast across 85-degree angles in all orientations. This is a critical requirement for wrist-mounted devices where the user's viewing angle varies continuously, as well as for control panels installed at non-ideal viewing positions.

Application scenarios include：

Smartwatches and fitness trackers：The 1.46-inch diameter provides sufficient display area for time, notifications, heart rate data, and fitness metrics while maintaining a comfortable wrist profile. The 360×360 resolution enables sharp text and detailed watch faces.

Smart home rotary knob displays：The circular form factor integrates seamlessly with physical rotary encoders. The IPS viewing angles ensure readability from any position around the device.

Industrial HMIs：Handheld programming terminals, pendant controllers, and portable test equipment benefit from the compact size and wide operating temperature range (-20°C to +70°C).

Medical devices：Handheld diagnostic tools, patient monitoring interfaces, and portable analyzers rely on the display's readability and low power consumption.

Automotive：Aftermarket climate control panels, seat adjustment interfaces.

2. Key Features and Functional Advantages

ST77916 Driver with QSPI Interface -- The ST77916 driver IC supports QSPI interface operation at higher throughput than standard 4-line SPI. This bandwidth advantage translates to smoother UI transitions and reduced rendering latency, particularly important for rotary knob interfaces where immediate visual feedback is expected. The driver supports 262K colors and includes on-chip GRAM that eliminates external frame buffer requirements.

12-Pin QSPI Design -- The QSPI-1 channel configuration requires only 12 pins, significantly reducing PCB routing complexity compared to 16- to 24-pin alternatives. For space-constrained designs such as smart rings and compact wearables, this pin count reduction can be the difference between a feasible layout and a board respin.

IPS Technology with Free Viewing Direction -- The IPS panel delivers consistent color and contrast from any viewing angle (85/85/85/85 degrees). This is not a marketing claim but a verified specification that ensures readability regardless of how the end device is oriented relative to the user.

262K Color Depth -- 18-bit color depth provides 262,144 distinct colors, sufficient for rich UI graphics, photo-quality images, and readable text rendering across various background and foreground color combinations.

Built-in GRAM -- The ST77916's integrated GRAM stores the complete 360×360 frame buffer internally, eliminating the need for external RAM chips and reducing system cost.

Extended Operating Temperature -- Rated for -20°C to +70°C operation and -30°C to +80°C storage, this module is suitable for industrial and outdoor applications that experience temperature extremes.

RoHS Compliance -- All materials meet RoHS environmental standards, ensuring compliance with global electronics regulations.

3. Application Areas

The 1.46 Inch Round TFT LCD Module serves the following industry sectors：

Smart Wearables -- Smartwatches, fitness trackers, and smart rings. The 1.46-inch diameter with 360×360 resolution has become a standard configuration for mid-tier and premium smartwatches. The display is featured in commercial products such as the Joyroom JR FC2 Pro (1.46-inch circular display, 360×360 resolution, 2.5D high-transmittance glass) and the ESP32-S3-based CrowPanel development board (360×360 IPS round display with capacitive touch and rotary knob interaction).

Smart Home -- Rotary knob interfaces for thermostats, smart coffee machines, air purifiers, and appliance controls. The circular form factor aligns with physical knob movement, and the IPS viewing angle ensures readability from various positions around the device.

Industrial Control -- Handheld HMI pendants, PLC programming terminals, and portable test equipment. The -20°C to +70°C operating range supports factory floor environments, and the compact size fits ergonomic handheld enclosures.

Medical Devices -- Handheld diagnostic tools, patient monitors, and portable analyzers. The high-resolution display enables clear presentation of patient data while the low power consumption supports battery-operated designs.

Automotive Aftermarket -- Climate control panels, seat adjustment interfaces, and vehicle information displays. The round form factor provides design flexibility for custom dashboard installations.

Consumer Electronics -- Portable media players, smart remote controls, and educational devices.

4. Product Details and Visual Features

FPC Configuration -- The standard module uses a 12-pin, 0.5mm pitch FPC with gold-plated pads and a reinforced stiffener. The QSPI-1 channel interface simplifies hardware connection while maintaining sufficient data throughput for 360×360 resolution at 60 fps. The default FPC exit direction is customizable based on customer enclosure requirements.

Backlight Design -- Typical brightness ranges from 300 to 450 cd/m² depending on the specific product variant. High-brightness versions up to 1000 cd/m² are available for outdoor and brightly lit environments. Backlight current is approximately 40–60 mA at 3.0V.

Mechanical Integration -- The panel active area measures 36.94 × 36.94 mm. Module outline dimensions are approximately 39.24 × 41.01 × 1.60 mm for standard configurations, with variations based on FPC length and connector type. Detailed 2D and 3D mechanical drawings are provided with every sample shipment.

Surface Treatment -- The polarizer includes anti-glare coating as standard to reduce reflections under bright overhead lighting. A glossy finish is available as a custom option for applications prioritizing maximum perceived sharpness.

Capacitive Touch Option -- Capacitive touch panel (CTP) integration is available using CST816D or FT3267 controllers. The capacitive touch overlay adds approximately 0.6–0.8mm to total module thickness. The CTP interface can be configured to share the same FPC connector or use a separate connection depending on system architecture requirements.

5. Quality Assurance

Reliability Testing

High temperature operation (+70°C) ：72 hours, no flicker or color shift

Low temperature storage (-30°C) ：168 hours, no glass crack or delamination

Humidity resistance (40°C / 85% RH) ：96 hours, no condensation or functional failure

FPC flex test ：1,000 cycles at 5mm radius, no trace discontinuity

Backlight life ：≥20,000 hours continuous operation typical

Certifications

RoHS Compliant -- Lead-free materials

REACH Compliant -- Meets EU chemical safety standards

ISO 9001：2015 -- Quality management system certified

ISO 14001：2015 -- Environmental management system certified

6. Customization Services

As a factory-direct manufacturer, we offer the following customization options：

FPC Customization - Length modification (20mm to 200mm), exit direction (bottom, side, or custom angle), connector type (ZIF, pin header, or custom soldering pads), mounting holes, and gold finger dimensions. Custom FPC tooling requires 3–4 weeks and a one-time NRE fee.

Touch Panel Integration - Capacitive touch (CTP) using CST816D or FT3267 controllers, or resistive touch (RTP). CTP adds approximately 0.6–0.8mm to total thickness. Optical bonding or air gap options available.

Cover Glass - Tempered glass lens with anti-glare coating, anti-fingerprint coating, or silk-printed decoration (logos, borders, or button legends). Custom glass tooling requires 4–5 weeks.

Brightness and Backlight - Standard 300–450 cd/m². High-brightness versions up to 1000 cd/m² available for sunlight-readable applications.

Interface Variants - QSPI is standard. Alternative interfaces include 4-line SPI, MCU 8-bit parallel, and MIPI DSI (1-lane).

Operating Temperature Extension - Extended range to -30°C ~ +80°C operation (standard: -20°C ~ +70°C).

Minimum Order Quantities ：

Standard modules (no customization)：1,000 pieces

Customized modules：3,000 pieces (lower MOQ negotiable for pilot projects)

Sample orders：1–5 pieces, nominal sample fee (refundable against production order)

Typical delivery lead time：2–5 weeks

 

 

 

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

 

 

 

 

                                                           

 

 

 

SPECIFICATIONS

ITEM	DIMENSION	UNIT
Size	1.46	inch
Outline Dimention	39.3x40.71x1.6	mm
Operating Temperature	-20°- +70°	°C
Storage Temperature	-30°- +80°	°C
Resolution	360x360

 

 

 

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