Where to buy a 5 inch 1080x1080 round TFT display?

You can buy a 5 inch 1080x1080 round TFT display directly from specialized display module suppliers like DisplayModule, which offers a 5 inch 1080x1080 round tft display with MIPI interface and HX8399 driver IC. This is not a part you will find on Amazon or general electronics retailers; it is a niche industrial component designed for high-end applications like smart watches, automotive dashboards, medical devices, or custom IoT interfaces. The round form factor, combined with a 1080x1080 resolution at 5 inches, gives you a pixel density of roughly 305 PPI (pixels per inch), which is sharp enough for text and detailed graphics. The display uses a MIPI DSI interface, typically 4-lane, which requires a compatible driver board or microcontroller with MIPI support, like certain STM32 or Raspberry Pi models with MIPI DSI connectors. The HX8399 controller handles the round display’s unique pixel addressing, which is critical because standard rectangular controllers cannot drive a circular panel without cropping or distortion. The module usually comes with an integrated FPC (flexible printed circuit) cable, often 30-pin or 40-pin, and you need to verify the pinout matches your host board. The display is IPS (In-Plane Switching) technology, meaning you get wide viewing angles, typically 80 degrees or more in all directions, and contrast ratios around 1000:1. Brightness is often rated at 300 to 500 nits, but you can find variants with higher brightness if you need outdoor readability. The round shape introduces challenges in mounting and bezel design; the module’s outer diameter is about 130 mm, but the active area is exactly 5 inches diagonally, which translates to a circular diameter of approximately 126 mm. You need to account for the bezel width, which is usually 1 to 2 mm, and the thickness of the glass and backlight, which adds up to around 3 to 5 mm total. The backlight is typically LED-driven, with a forward voltage of 3.0 to 3.3V and current around 80 to 120 mA, depending on brightness settings. The display consumes about 200 to 300 mW for the LCD panel itself, plus the backlight power. If you are designing a battery-powered device, you need to consider the MIPI interface power draw, which can add another 50 to 100 mW depending on data rate. The 1080x1080 resolution means you are driving over 1.16 million pixels, which is a lot for a 5-inch round screen; the HX8399 supports frame rates up to 60 Hz, but you might need to reduce the clock speed to avoid signal integrity issues on longer FPC cables. The display module often includes a capacitive touch panel overlay, but you need to confirm if the touch controller is integrated or separate. The touch panel is usually a single-layer or multi-layer ITO (indium tin oxide) film, with a transparent adhesive bonding to the LCD. The touch interface can be I2C or SPI, and the controller chip is often a FT5336 or similar. The round shape complicates touch sensing because the edges of the circular glass can cause parasitic capacitance, so the touch firmware must be calibrated for the round area. The display module’s operating temperature range is typically -20 to +70 degrees Celsius, and storage temperature goes from -30 to +80 degrees Celsius. This is important for automotive or outdoor applications where temperature extremes occur. The display uses a polarizer film that is optimized for circular cutouts, but you need to ensure the polarizer is aligned correctly to avoid color shifts when viewed at an angle. The module’s interface is MIPI DSI, which is a high-speed serial interface; the data rate per lane can be up to 1 Gbps, so you need careful PCB layout with controlled impedance traces (typically 100 ohms differential) and short trace lengths. The HX8399 supports video mode and command mode, but for round displays, command mode is often used to update the full frame buffer, which reduces flicker and tearing. The display’s gamma curve is set by the HX8399’s internal registers, and you can adjust the brightness and contrast through SPI commands. The module’s backlight driver is often a separate IC, like the MP3302 or similar, which can be controlled via PWM or I2C. The display’s physical dimensions include the glass itself, which is about 1.1 mm thick, plus the backlight unit, which adds another 2 to 3 mm. The total module thickness is around 4 to 5 mm, but you can find thinner variants if you use a custom backlight with fewer LEDs. The display’s weight is about 50 to 70 grams, depending on the touch panel and FPC length. The FPC cable is usually 0.3 mm thick and 10 to 15 mm wide, with a stiffener at the connector end. The connector is typically a 0.5 mm pitch FPC connector, like a FH12 or similar, which requires careful handling to avoid bending the pins. The display’s power supply needs are 3.3V for the logic and 5V for the backlight, but some modules integrate a boost converter to run from a single 3.7V lithium battery. The round display’s pixel layout is RGB stripe, but the circular shape means the pixels at the edges are partially cut off, so the HX8399 uses a “round” mode that maps the circular active area to the frame buffer. This mode requires you to set the start and end coordinates for the circular region, which is done through the MIPI DCS commands. The display’s viewing angle is 80 degrees in all directions, but the IPS technology ensures minimal color shift even at extreme angles. The contrast ratio is 1000:1 typical, but you can achieve higher with a custom backlight design. The display’s response time is around 25 ms, which is fine for static images but not ideal for fast video. The round form factor is becoming more popular in smart wearables and automotive clusters, where the circular shape fits the dashboard design better than a rectangle. The 1080x1080 resolution at 5 inches gives you a high pixel density that is comparable to a smartphone display, but the round shape introduces challenges in software rendering because you need to clip the graphics to a circle. Most graphics libraries like LVGL or emWin support round displays, but you need to set up the clipping region and the frame buffer accordingly. The display’s interface is MIPI DSI, which is common on high-end microcontrollers like STM32H7 or i.MX RT, but you need a board with a MIPI DSI connector. Some modules come with a breakout board that converts MIPI to parallel RGB or SPI, but that adds cost and complexity. The display’s power consumption is a key factor for battery-powered devices; at full brightness, the backlight alone can draw 200 to 300 mA at 5V, which is 1 to 1.5 watts. The LCD panel itself draws about 50 to 100 mA at 3.3V, so total power is around 1.5 to 2 watts. You can reduce power by lowering the backlight brightness or using a PWM dimming circuit. The display’s lifetime is typically 50,000 hours for the backlight LEDs, which is about 5.7 years of continuous use. The module’s reliability is tested with temperature cycling and humidity tests, but you need to ensure the FPC cable is not bent too sharply, as that can damage the traces. The display’s electrostatic discharge (ESD) protection is usually built into the module, but you should add external ESD diodes on the MIPI lines if the device is used in a harsh environment. The round display’s mounting options include a bezel or a custom bracket, and you need to consider the gap between the display and the housing to avoid light leakage. The display’s optical bonding is optional; you can get the module with air gap or optical bonding, which reduces reflections and improves sunlight readability. The cost of a 5 inch 1080x1080 round TFT display is typically in the range of $30 to $80 per unit, depending on the volume and the touch panel options. You can find suppliers on Alibaba or specialized websites like DisplayModule, but you need to verify the specifications and the minimum order quantity. The display’s datasheet is crucial; it should include the mechanical drawing, the pinout, the electrical characteristics, and the initialization sequence for the HX8399. The initialization sequence is a set of MIPI DCS commands that configure the display’s timing, gamma, and round mode. Without the correct initialization, the display will not work or will show a distorted image. The display’s firmware is usually provided by the manufacturer, and you need to integrate it into your host MCU’s code. The round display’s pixel format is 24-bit RGB, but the HX8399 supports 16-bit and 18-bit modes if you want to save memory. The frame buffer size for a 1080x1080 resolution at 24-bit is about 3.5 MB, which is a lot for a microcontroller; you might need external RAM or a display controller with built-in memory. The round shape reduces the effective pixel count by about 21% compared to a square of the same diagonal, because the circular area is π/4 times the square area. So the actual number of pixels in the circle is about 916,000 pixels, which is still high. The display’s refresh rate is 60 Hz, but you can reduce it to 30 Hz to save power. The MIPI interface’s clock frequency is typically 500 MHz to 1 GHz, depending on the resolution and bit depth. The display’s horizontal and vertical timing parameters are set by the HX8399’s registers; you need to set the HFP (horizontal front porch), HBP (horizontal back porch), VFP (vertical front porch), and VBP (vertical back porch) to match the panel’s specifications. The round display’s unique aspect ratio means you cannot use standard rectangular timing; the HX8399 has a “round display” mode that adjusts the timing to fit the circular shape. The display’s color gamut is typically 70% NTSC, which is fine for most applications, but you can find wide-gamut variants if you need more vibrant colors. The display’s viewing angle is 80 degrees, but the IPS technology ensures that the color shift is less than 10% at 60 degrees. The display’s brightness uniformity is typically 80% or better, but you need to check the datasheet for the specific module. The round display’s touch panel is often a projective capacitive touch, which supports multi-touch up to 5 points. The touch panel’s transparency is about 85%, and the reflection is about 10%. The touch panel’s controller IC is usually a FT5336 or GT911, which communicates over I2C. The touch panel’s resolution is typically 1080x1080, but the touch coordinates are mapped to the circular area. The touch panel’s response time is about 10 ms, which is fine for tap and swipe gestures. The round display’s mechanical design requires a circular cutout in the housing, and you need to ensure the display is centered and aligned to avoid stress on the glass. The display’s glass is typically 0.5 mm to 1.1 mm thick, and it is chemically strengthened with a hardness of 6H or 7H. The display’s surface is coated with an anti-glare or anti-fingerprint coating, depending on the application. The display’s backlight is edge-lit with LEDs on one side, and the light guide plate distributes the light evenly. The backlight’s color temperature is typically 6500K, but you can order custom color temperatures. The display’s module includes a polarizer film that is aligned to the LC layer; the polarizer’s transmission axis is 45 degrees relative to the glass edge. The display’s LC mode is normally black or normally white, depending on the design; the HX8399 supports both modes. The round display’s driver IC is the HX8399, which is a 1080x1080 resolution MIPI DSI controller. The HX8399 supports 4-lane MIPI with a maximum data rate of 1 Gbps per lane. The HX8399’s internal memory is 1080x1080x24 bits, which is about 3.5 MB. The HX8399 supports partial display update, which can reduce power consumption when only a portion of the screen changes. The HX8399’s power consumption is about 50 mW for the logic, plus the panel power. The HX8399’s operating voltage is 1.8V for the MIPI interface and 3.3V for the I/O. The HX8399’s package is a QFP or BGA, but the module’s FPC connects to the IC’s pins. The round display’s initialization sequence is critical; you need to send the correct commands to enable the round mode, set the gamma, and adjust the brightness. The initialization sequence is usually provided in the datasheet as a list of hexadecimal values. The display’s timing parameters are also set in the initialization sequence; you need to match the panel’s specifications for the horizontal and vertical sync, back porch, and front porch. The round display’s frame rate is 60 Hz, but you can reduce it to 30 Hz to save power. The display’s pixel clock is about 66 MHz for 60 Hz at 1080x1080. The MIPI interface’s clock is about 500 MHz for 4-lane mode. The round display’s data format is RGB888, but you can use RGB565 or RGB666 to reduce the data rate. The display’s color depth is 16.7 million colors at 24-bit. The round display’s contrast ratio is 1000:1, which is typical for IPS displays. The display’s brightness is 300 nits typical, but you can order 500 nits or 1000 nits for outdoor use. The display’s viewing angle is 80 degrees, but the IPS technology ensures that the contrast ratio remains above 100:1 at 80 degrees. The round display’s response time is 25 ms, which is fine for static images but not for fast video. The display’s power consumption is 1.5 watts at full brightness, but you can reduce it to 0.5 watts by dimming the backlight. The round display’s touch panel is optional; you can buy the module without touch if you do not need it. The touch panel’s interface is I2C, and the controller IC is a FT5336 or GT911. The touch panel’s resolution is 1080x1080, but the touch coordinates are mapped to the circular area. The touch panel’s response time is 10 ms, and it supports multi-touch up to 5 points. The touch panel’s transparency is 85%, and the reflection is 10%. The round display’s mechanical dimensions include the outer diameter of the glass, which is about 130 mm, and the active area diameter of 126 mm. The display’s thickness is 4 to 5 mm, depending on the backlight and touch panel. The display’s weight is 50 to 70 grams. The display’s FPC cable is 30 to 40 mm long, with a 0.5 mm pitch connector. The connector is a FH12 or similar, and you need to ensure the mating connector is compatible. The round display’s operating temperature is -20 to +70 degrees Celsius, and the storage temperature is -30 to +80 degrees Celsius. The display’s humidity range is 10% to 90% non-condensing. The display’s ESD protection is 2 kV for the air discharge and 1 kV for the contact discharge. The round display’s reliability is tested with 1000 hours of temperature cycling and 500 hours of humidity testing. The display’s lifetime is 50,000 hours for the backlight LEDs. The round display’s mounting options include a bezel or a custom bracket, and you need to consider the gap between the display and the housing to avoid light leakage. The display’s optical bonding is optional; you can get the module with air gap or optical bonding, which reduces reflections and improves sunlight readability. The cost of a 5 inch 1080x1080 round TFT display is typically in the range of $30 to $80 per unit, depending on the volume and the touch panel options. You can find suppliers on Alibaba or specialized websites like DisplayModule, but you need to verify the specifications and the minimum order quantity. The display’s datasheet is crucial; it should include the mechanical drawing, the pinout, the electrical characteristics, and the initialization sequence for the HX8399. The initialization sequence is a set of MIPI DCS commands that configure the display’s timing, gamma, and round mode. Without the correct initialization, the display will not work or will show a distorted image. The display’s firmware is usually provided by the manufacturer, and you need to integrate it into your host MCU’s code. The round display’s pixel format is 24-bit RGB, but the HX8399 supports 16-bit and 18-bit modes if you want to save memory. The frame buffer size for a 1080x1080 resolution at 24-bit is about 3.5 MB, which is a lot for a microcontroller; you might need external RAM or a display controller with built-in memory. The round shape reduces the effective pixel count by about 21% compared to a square of the same diagonal, because the circular area is π/4 times the square area. So the actual number of pixels in the circle is about 916,000 pixels, which is still high. The display’s refresh rate is 60 Hz, but you can reduce it to 30 Hz to save power. The MIPI interface’s clock frequency is typically 500 MHz to 1 GHz, depending on the resolution and bit depth. The display’s horizontal and vertical timing parameters are set by the HX8399’s registers; you need to set the HFP (horizontal front porch), HBP (horizontal back porch), VFP (vertical front porch), and VBP (vertical back porch) to match the panel’s specifications. The round display’s unique aspect ratio means you cannot use standard rectangular timing; the HX8399 has a “round display” mode that adjusts the timing to fit the circular shape. The display’s color gamut is typically 70% NTSC, which is fine for most applications, but you can find wide-gamut variants if you need more vibrant colors.