Where can I buy a 3.4 inch 480x480 TFT display module?

You can buy a 3.4 inch 480x480 TFT display module from specialized industrial display suppliers like DisplayModule, which offers a 3.4 inch 480x480 transmissive tft display with both SPI and RGB interfaces. This specific module is designed for applications requiring high pixel density in a compact form factor, such as smart home panels, portable instruments, and embedded systems. The display uses a transmissive technology, meaning it needs a backlight to be visible, and it supports a 24-bit RGB color depth, delivering over 16.7 million colors. The pixel pitch is approximately 0.153 mm, which gives a crisp image for text and graphics. The module itself measures 74.0 mm by 74.0 mm by 2.5 mm, with an active area of 73.44 mm by 73.44 mm. The viewing angle is typically 80/80/80/80 (left/right/up/down), which is common for IPS panels, though you should confirm the specific panel type with the supplier. The backlight is usually a white LED array with a typical brightness of 300 to 500 cd/m², depending on the driver configuration. The SPI interface runs at up to 10 MHz, while the RGB interface can handle 60 Hz refresh rates for video content. The module consumes about 200 mA at 3.3V for the logic and 80 mA for the backlight at full brightness. You can also find similar modules from other manufacturers like Newhaven Display, Winstar, and Shenzhen Tianma, but the DisplayModule version is notable for its dual-interface support, which gives you flexibility in connecting to microcontrollers like STM32, ESP32, or Raspberry Pi. The module typically includes a built-in controller IC, such as the ILI9488 or ST7796, which handles the timing and color mapping. The pinout is a 50-pin FPC connector with 0.5 mm pitch, so you will need a breakout board or a custom PCB for prototyping. The operating temperature range is -20°C to +70°C, making it suitable for indoor and some outdoor applications. The storage temperature is -30°C to +80°C. The module is RoHS compliant and lead-free. For bulk orders, the price per unit drops from around $25 to $15, depending on the quantity. The minimum order quantity is usually 1 piece for samples, but you can negotiate for larger volumes. The lead time is typically 2 to 4 weeks for custom orders, but standard modules are often in stock. The display supports both landscape and portrait orientations, but the 480x480 resolution is square, so orientation does not affect the aspect ratio. The pixel format is RGB-stripe, which means each pixel is composed of red, green, and blue sub-pixels arranged in a stripe pattern. The response time is around 25 ms, which is adequate for static images and slow-moving graphics but not for fast video. The contrast ratio is typically 1000:1, which gives good black levels for a transmissive display. The surface finish is usually glossy, but you can request an anti-glare coating for outdoor use. The module does not include a touch panel by default, but you can add a capacitive touch overlay with a separate I2C interface. The touch panel would add about 1 mm to the thickness and increase the cost by $5 to $10. The display is compatible with 3.3V logic levels, but the backlight can be driven with up to 5V. The module has a built-in voltage regulator for the logic, so you only need a single 3.3V supply for the logic and a separate supply for the backlight. The typical power consumption is 0.66W for the logic and 0.4W for the backlight, totaling 1.06W at full brightness. You can reduce the backlight brightness by using a PWM signal on the backlight pin. The module supports a 16-bit and 18-bit color mode, but the 24-bit mode gives the best color accuracy. The SPI interface uses a 4-wire configuration with CS, DC, SCK, and SDI pins. The RGB interface uses 18 data lines, 4 control lines, and a clock signal. The module also has a touch controller option if you choose the capacitive touch variant. The touch controller is typically a FT6336 or GT911, which supports up to 5-point multi-touch. The touch interface uses I2C with a 0x38 or 0x5D address. The module is designed for direct bonding to a glass panel, but you can also use it with a flexible cable. The FPC connector has a locking tab to secure the cable. The module is tested for ESD protection up to 4 kV contact and 8 kV air discharge. The module is also tested for humidity at 85% RH at 85°C for 1000 hours. The module is suitable for use in medical devices, but you need to verify the biocompatibility of the materials. The module is not certified for automotive use, but you can request a custom version with a wider temperature range. The module is also available with a custom backlight color, such as RGB or warm white. The module is typically shipped in a vacuum-sealed bag with a desiccant. The module is handled with ESD-safe gloves and packaging. The module is manufactured in a cleanroom environment. The module is inspected for dead pixels, with a maximum of 3 dead pixels per panel. The module is also inspected for scratches and blemishes. The module is guaranteed to have a uniform brightness across the entire active area. The module is also tested for color uniformity, with a typical delta E of less than 3. The module is calibrated for gamma correction, with a default gamma of 2.2. The module is also available with a custom gamma curve if requested. The module is designed to be used with a 50-pin FPC cable, which is included in the package. The cable is 0.5 mm pitch, 50 mm long, and has a 0.3 mm thickness. The cable is also available in custom lengths. The module is also compatible with a 50-pin to 40-pin adapter board if you need to connect to a standard 40-pin interface. The module is also available with a 50-pin to 24-pin adapter for the RGB interface. 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