2.1-inch Round TFT-LCD Display Module (3-Wire SPI + RGB 18-bit Interface)

Display Panel

The module features a 2.1-inch diagonal round TFT panel with an RGB stripe arrangement and a square pixel pitch of 0.111 mm (H) × 0.111 mm (V). The ADS Normally Black transmissive mode delivers a typical contrast ratio of 1000:1 and a high luminance of 450 cd/m² (measured at IF = 20 mA, VF = 12.8 V, Ta = 25 °C). Typical luminance uniformity is 90%, with an NTSC color gamut of 69%, providing bright and uniform images.

Interface & Driver

The ST7701 driver IC supports a 3-wire SPI control bus (SDA, SCK, CS) combined with an RGB 18-bit parallel interface (DB0–DB17, PCLK, DE, VSYNC, HSYNC), offering flexible command configuration and high-quality parallel pixel data transfer at a typical DCLK of 17 MHz (range 10–30 MHz). A 40-pin FPC (0.5 mm pitch) mates with the OMRON XF2M-4015-1A or equivalent connector. Touch interface pins (TP_INT, TP_SDA, TP_SCL, TP_RESET, TP_VCI) are reserved but not connected (the module ships without CTP).

Power & Backlight

The module operates from a single power supply VCI of 2.6–3.3 V (typical 3.0 V), with a typical current draw of 24 mA. The backlight comprises 4 white LEDs (4 in series × 1 in parallel) with a typical forward current of 20 mA and forward voltage of 12.8 V. The low 20 mA backlight current makes the module particularly suitable for battery-powered portable and wearable products.

Optical Performance

All-direction viewing angle: θT/θB/θL/θR all reach 85° (CR ≥ 10). Typical response time is 30 ms. White chromaticity (CIE1931) is x=0.314, y=0.299, with full RGB color coordinate specifications provided in the optical characteristics table.

Environmental & Reliability

Operating temperature: -20 °C to +70 °C; storage temperature: -30 °C to +80 °C; humidity: 10%–90% RH. The module passes high/low temperature operation (240 h), high/low temperature storage (240 h), high-temperature high-humidity storage (60 °C, 90% RH, 240 h), thermal shock (-30 °C ↔ +70 °C, 10 cycles), and ESD testing (air discharge ±8 kV, contact discharge ±4 kV).