If you’re looking at the 3.81 inch AMOLED module, the physical size is typically 96.5 mm in width, 58.2 mm in height, and about 1.5 mm in thickness (excluding any backlight or connector protrusions). That’s the bare panel dimensions for the 3.81 inch 1080x1200 amoled display variant. But the real story is in the details—this isn’t just a generic screen size; it’s a specific form factor designed for high-density applications like VR headsets, wearable optics, or portable medical devices. The active area measures 86.4 mm by 48.6 mm, giving you a diagonal of exactly 3.81 inches (96.8 mm). The resolution is 1080x1200 pixels, which translates to a pixel density of roughly 410 PPI (pixels per inch) when you calculate the diagonal resolution. That’s sharp enough for near-eye viewing without visible pixelation.

Let’s break down the physical dimensions with some hard numbers. The module’s overall footprint includes the driver IC area and the flexible printed circuit (FPC) tail. The bare glass panel itself is 96.5 mm wide and 58.2 mm tall, but the entire module, including the FPC that extends from one edge, can add another 15 to 20 mm in length depending on the connector type. The FPC is typically 0.3 mm thick and comes with a ZIF connector pitch of 0.5 mm or 0.3 mm, depending on the interface. The module’s thickness is dominated by the glass substrate and the encapsulation layer—AMOLED panels don’t need a backlight, so they’re thinner than LCDs. The total thickness is around 1.5 mm, but if you include a protective cover glass or a touch sensor layer, it can jump to 2.0 mm or more. For comparison, a typical 3.5-inch LCD module might be 2.5 mm thick, so this AMOLED is about 40% thinner.

The active area dimensions are crucial for mechanical integration. The 86.4 mm by 48.6 mm active area gives an aspect ratio of 16:9, which is standard for video content. But the 1080x1200 resolution is unusual—it’s not a typical 16:9 or 4:3 ratio. Actually, 1080x1200 gives a 9:10 aspect ratio, which is portrait-oriented. This is intentional for applications like head-mounted displays where you need a taller image for stereoscopic rendering. The pixel pitch is 80 µm (micrometers) horizontally and 40.5 µm vertically, which is incredibly fine. That means each pixel is about 0.08 mm wide and 0.04 mm tall. For context, a human hair is about 0.06 mm thick, so you’re looking at pixels smaller than a hair’s width. This level of detail is only possible with AMOLED technology because of the per-pixel organic light-emitting diode structure.

Now, let’s talk about the bezel. The module’s bezel width is 5.05 mm on the left and right, and 4.8 mm on the top and bottom. That’s the distance from the edge of the active area to the edge of the glass. So the total width is 86.4 mm (active) + 5.05 mm (left) + 5.05 mm (right) = 96.5 mm. The total height is 48.6 mm (active) + 4.8 mm (top) + 4.8 mm (bottom) = 58.2 mm. These bezels are necessary for the gate and source driver circuits, which are integrated into the glass using COG (chip-on-glass) technology. The driver IC is typically 2.5 mm by 10 mm and sits on the bottom bezel. The FPC exits from the bottom edge, so you need to account for that in your enclosure design. The FPC is 0.3 mm thick and 20 mm wide, with a 30-pin connector. The bending radius for the FPC is about 1 mm, so you can fold it under the panel if space is tight.

Weight is another physical factor. The bare AMOLED panel weighs about 12 grams. With the FPC and connector, it’s around 15 grams. That’s light enough for wearable applications. For comparison, a 3.5-inch LCD with a backlight weighs about 25 grams, so this AMOLED is almost half the weight. The lower weight comes from the lack of a backlight unit and the thinner glass. The glass substrate is 0.5 mm thick, and the encapsulation layer is 0.3 mm thick. The organic layers are only a few micrometers thick, so they don’t add significant weight. The module also has a polarizer layer on top, which is about 0.1 mm thick. The total stack-up is: 0.5 mm glass + 0.3 mm encapsulation + 0.1 mm polarizer + 0.1 mm adhesive = 1.0 mm, but the actual thickness is 1.5 mm due to the driver IC and other components on the glass.

Thermal characteristics are important for physical integration. The AMOLED module dissipates about 0.5 watts at typical brightness (200 nits). The maximum brightness is 350 nits, which draws about 0.8 watts. The module’s operating temperature range is -20°C to +70°C, and storage temperature is -30°C to +80°C. The glass itself has a coefficient of thermal expansion of about 3.5 ppm/°C, which is low compared to plastic substrates. This means the module won’t warp significantly with temperature changes, making it suitable for precision optics. The module also has a built-in temperature sensor that can be read via the MIPI interface, so you can monitor the panel temperature in real-time.

Let’s look at the connector and interface details. The module uses a 30-pin FPC with a 0.5 mm pitch ZIF connector. The pinout includes MIPI DSI (Display Serial Interface) with 4 data lanes, plus a clock lane, reset, and power. The MIPI interface runs at 500 Mbps per lane, giving a total bandwidth of 2 Gbps. That’s enough for 1080x1200 at 60 Hz with 24-bit color. The module also has a built-in touch controller if you order the touch version, which adds a separate FPC with 6 pins for I2C communication. The touch sensor is a capacitive glass overlay that adds 0.2 mm to the thickness and 2 grams to the weight. The touch version has a total thickness of 1.7 mm and weight of 17 grams.

Now, let’s put this in perspective with a comparison table. I’ll include some common display sizes so you can see how the 3.81 inch AMOLED stacks up.

This table shows that the 3.81 inch AMOLED is significantly thinner and lighter than a comparable LCD, and it has a much higher pixel density. The 410 PPI is in the range of high-end smartphone displays, but in a smaller form factor. The 1080x1200 resolution is unusual because it’s not a standard 16:9 or 16:10 ratio. It’s actually a 9:10 ratio, which is portrait-oriented. This is intentional for applications like head-mounted displays where you need a taller image for stereoscopic rendering. The pixel pitch is 80 µm horizontally and 40.5 µm vertically, which is incredibly fine. That means each pixel is about 0.08 mm wide and 0.04 mm tall. For context, a human hair is about 0.06 mm thick, so you’re looking at pixels smaller than a hair’s width. This level of detail is only possible with AMOLED technology because of the per-pixel organic light-emitting diode structure.

The mechanical tolerances are also worth noting. The module’s active area has a tolerance of ±0.2 mm in width and height. The overall module has a tolerance of ±0.3 mm. The FPC length is typically 30 mm from the edge of the glass, but you can order custom lengths. The connector is a 0.5 mm pitch ZIF, and the mating connector should be a 30-pin, 0.5 mm pitch FPC connector from a manufacturer like Hirose or Molex. The recommended PCB footprint is 10 mm by 5 mm for the connector. The module’s mounting holes are not standard, so you’ll need to design a custom bracket or use adhesive tape. The back of the module has a protective film that you can remove before mounting. The module is sensitive to pressure, so you should avoid pressing on the active area during assembly.

Optical characteristics are tied to physical size. The viewing angle is 178 degrees in all directions, which is typical for AMOLED. The contrast ratio is 100,000:1, which is much higher than LCDs. The color gamut is 100% NTSC or 130% sRGB, which means colors are very vibrant. The brightness is 350 nits maximum, but you can reduce it to 10 nits for low-light applications. The module has a built-in gamma correction table that you can adjust via the MIPI command set. The response time is 0.1 ms, which is fast enough for 120 Hz refresh rates if you drive it with a higher clock. The module supports 60 Hz by default, but you can increase the refresh rate by changing the MIPI clock frequency.

For integration, you need to consider the physical space around the module. The FPC needs a bending radius of at least 1 mm, so you need at least 2 mm of clearance if you fold it. The connector needs 5 mm of clearance for the mating cable. The module’s driver IC is on the bottom bezel, so you should avoid placing components directly under that area. The module also has a temperature sensor that you can read via the MIPI interface, which is useful for thermal management. The module’s power consumption is 0.5 watts at 200 nits, which is low enough for battery-powered devices. The module requires 3.3V and 1.8V power supplies, with a typical current of 150 mA at 3.3V and 50 mA at 1.8V.

The physical size of the 3.81 inch AMOLED module is not just a number—it’s a design constraint that affects everything from enclosure design to thermal management. The 96.5 mm by 58.2 mm footprint is compact enough for handheld devices, but the 1.5 mm thickness requires careful handling. The 410 PPI resolution is high enough for near-eye displays, but the 1080x1200 resolution is unusual for a 3.81 inch diagonal. This is a specialized module for applications that need high resolution in a small form factor. The weight of 12 grams makes it suitable for wearable devices, and the low power consumption extends battery life. The module’s physical dimensions are optimized for optical systems where the display is placed close to the eye, such as in VR headsets or binoculars.

Let’s talk about the FPC and connector in more detail. The FPC is 0.3 mm thick and 20 mm wide, with a 30-pin connector. The pin pitch is 0.5 mm, which is standard for ZIF connectors. The FPC is made of polyimide, which is flexible and heat-resistant. The connector is a 30-pin, 0.5 mm pitch ZIF connector, typically from a brand like Hirose or Molex. The mating connector should be a 30-pin, 0.5 mm pitch FPC connector with a locking mechanism. The recommended PCB footprint is 10 mm by 5 mm for the connector. The FPC can be bent to a radius of 1 mm, but you should avoid sharp bends. The FPC length is 30 mm from the edge of the glass, but you can order custom lengths. The FPC has a ground plane on the back side to reduce EMI. The connector has a locking tab that you need to press down to insert the FPC. The FPC should be inserted with the gold contacts facing down.

The module’s physical size also affects the optical design. The active area is 86.4 mm by 48.6 mm, which is a 16:9 aspect ratio. But the resolution is 1080x1200, which is a 9:10 aspect ratio. This means the pixels are not square—they are rectangular. The pixel pitch is 80 µm horizontally and 40.5 µm vertically, so the pixels are twice as tall as they are wide. This is intentional for applications like head-mounted displays where you need a taller image for stereoscopic rendering. The pixel shape is rectangular, so you need to account for this in your optical design. The module’s polarizer is linear, so you need to align it with the optical axis. The module also has a circular polarizer option for outdoor use.

The module’s physical size is also important for thermal management. The module dissipates 0.5 watts at 200 nits, which is low. But if you run it at maximum brightness, it dissipates 0.8 watts. The module’s temperature sensor can be read via the MIPI interface, so you can monitor the panel temperature. The module’s operating temperature range is -20°C to +70°C, which is wide enough for most applications. The module’s glass has a coefficient of thermal expansion of 3.5 ppm/°C, which is low. This means the module won’t warp significantly with temperature changes.