The active area dimensions of a standard 0.32 inch 800x600 micro OLED are approximately 6.4 mm by 4.8 mm, with a diagonal of 8.0 mm (0.315 inches, typically rounded to 0.32 inches). The overall module dimensions, including the driver IC and flex cable, usually measure around 13.5 mm by 11.0 mm by 1.5 mm (length, width, thickness), though this varies by manufacturer and whether it includes a glass cover or a metal frame. The pixel pitch is roughly 8.0 micrometers per pixel, which is extremely fine for a display of this size. You can check the exact mechanical drawing for a specific product like the 0.32 inch 800x600 micro oled display for precise tolerances and connector locations.
Let’s break down what these numbers mean in practice. The 0.32 inch diagonal is the standard measurement for the display area where the actual pixels are lit. For an 800x600 resolution (SVGA) packed into that tiny space, the pixel density hits roughly 3170 pixels per inch (PPI). That’s over 10 times denser than a typical smartphone screen. The active area width is 6.4 mm, which is about the width of a standard pencil eraser. The height is 4.8 mm, roughly the thickness of two stacked US dimes. The total module footprint, including the driver chip bonded directly to the glass, is often smaller than a fingernail on your pinky finger. The thickness of 1.5 mm includes the backlight if it’s an OLED (self-emissive) but typically micro OLEDs don’t need a backlight—they use a silicon backplane, so the thickness is mostly the encapsulation layer and any protective cover glass.
Now, why do these dimensions matter for real-world applications? In near-eye displays like AR glasses, the 0.32 inch size allows for a compact optical engine. The 6.4 mm by 4.8 mm active area is designed to be magnified by lenses to create a virtual image that appears much larger—often 30 to 100 inches from a few centimeters away. The 800x600 resolution at this size means each pixel is only about 8 micrometers across. That’s about one-tenth the width of a human hair. This level of detail is crucial for reading text or displaying fine graphics in a head-up display (HUD) for pilots or surgeons. The small overall module dimensions also allow for multiple displays to be placed close together for stereoscopic vision without increasing the bulk of the headset.
Let’s get into the technical specs that define the dimensions more precisely. The active area is defined by the photolithography on the silicon wafer. The 800 columns and 600 rows of pixels are laid out in a rectangular matrix. The pixel pitch is calculated as the diagonal (8.0 mm) divided by the square root of (800² + 600²), which gives about 8.0 micrometers. In reality, manufacturers might list the pitch as 8.0 x 8.0 micrometers square, but the actual sub-pixel layout could be different. For RGB micro OLEDs, each pixel is composed of red, green, and blue sub-pixels that are side-by-side or stacked. The dimensions of the sub-pixels affect the fill factor—the percentage of the active area that actually emits light. A typical fill factor for a 0.32 inch 800x600 micro OLED is around 70% to 85%, meaning the rest is occupied by wiring and transistors. That’s still high enough to produce bright images, often exceeding 1000 nits for direct-view applications, or even 5000 nits for HUDs.
The overall module dimensions also include the bonding area for the flex cable. The flex cable is usually 0.3 mm thick and extends from one edge of the module, often the bottom or side. The cable length can be 20 mm to 50 mm depending on the application, but the module itself is the key dimension for mechanical design. The connector type (like 24-pin or 30-pin FPC) adds a small amount to the overall length, typically 1 mm to 2 mm. If the display includes a cover glass for protection, the total thickness might increase to 2.0 mm. Some modules also include a metal frame for heat dissipation, which adds 0.5 mm to the width and height. For example, a metal-framed version might measure 14.0 mm by 11.5 mm.
Temperature and environmental factors can affect these dimensions slightly. The silicon backplane has a coefficient of thermal expansion (CTE) of about 2.6 ppm/°C, meaning the active area will expand or contract by about 0.02 micrometers per degree Celsius. For most applications, this is negligible, but for precision optical alignment in AR, you need to account for it. The glass or epoxy encapsulation has a higher CTE, around 7 ppm/°C, so the overall module dimensions can shift by a few micrometers over a 50°C range. That’s why manufacturers provide mechanical drawings with tolerances of ±0.1 mm for the module and ±0.05 mm for the active area.
Let’s compare the 0.32 inch 800x600 micro OLED to other common micro display sizes. A 0.39 inch 854x480 micro OLED has an active area of about 8.5 mm by 4.8 mm, which is wider but similar in height. A 0.5 inch 1024x768 micro OLED has an active area of about 10.2 mm by 7.7 mm. The 0.32 inch is the smallest among common resolutions, making it ideal for applications where space is extremely tight, like in smart contact lenses or tiny camera viewfinders. The pixel density of 3170 PPI is among the highest available, though some experimental displays reach 5000 PPI. The trade-off is that the small active area limits the field of view (FOV) in AR. With a typical lens magnification of 10x, you get a virtual image diagonal of about 3.2 inches, which is small for full immersion but fine for data overlay.
Now, let’s talk about the electrical interface dimensions. The driver IC is often integrated onto the glass using chip-on-glass (COG) technology. The IC itself might be 2 mm by 1 mm by 0.5 mm, but it’s bonded directly to the glass substrate, so it doesn’t add to the overall thickness much. The I2C, RGB, and MIPI interfaces require different numbers of pins. For a 0.32 inch 800x600 micro OLED with MIPI DSI, you typically need a 30-pin FPC connector with a pitch of 0.3 mm or 0.4 mm. The connector adds about 1 mm to the module length. For I2C-only versions, the pin count is lower, often 12 to 16 pins, which reduces the connector size. The RGB interface requires parallel data lines, which increases the pin count to 24 or more. The choice of interface affects the overall module dimensions because the flex cable width must accommodate the number of traces. A 30-pin cable is about 8 mm wide, while a 16-pin cable is about 5 mm wide.
Power consumption also relates to dimensions. The small active area means the total current draw is low. At 1000 nits brightness, a 0.32 inch 800x600 micro OLED might consume 50 mW to 100 mW, depending on the content. The driver IC adds another 10 mW to 20 mW. This low power is a direct result of the small dimensions—fewer pixels to drive and less area to light up. For battery-powered devices like AR glasses, this is a critical advantage. The small size also means the display can be placed very close to the eye, reducing the need for large optics. The typical eye relief (distance from the eye to the display) is 15 mm to 25 mm for micro OLEDs, but the 0.32 inch size allows for a smaller optical module, sometimes as thin as 5 mm.
Manufacturing tolerances for these dimensions are tight. The active area is defined by the mask used in semiconductor fabrication. The typical tolerance is ±0.01 mm for the active area width and height. The overall module dimensions have a tolerance of ±0.1 mm. The flex cable alignment can vary by ±0.2 mm. For high-volume production, these tolerances are maintained through automated optical inspection (AOI). The glass substrate is usually 0.4 mm to 0.7 mm thick, and the encapsulation layer is 0.1 mm to 0.3 mm. The total module thickness of 1.5 mm is an average; some designs go down to 1.0 mm by using a thinner glass or no cover glass. But thinner modules are more fragile and require careful handling.
Let’s look at a comparison table for clarity:
| Parameter | Value |
|---|---|
| Active area diagonal | 8.0 mm (0.315 inches, rounded to 0.32) |
| Active area width | 6.4 mm |
| Active area height | 4.8 mm |
| Pixel pitch | 8.0 micrometers |
| Pixel density | 3170 PPI |
| Module width (typical) | 13.5 mm |
| Module height (typical) | 11.0 mm |
| Module thickness (typical) | 1.5 mm |
| Active area tolerance | ±0.01 mm |
| Module tolerance | ±0.1 mm |
| Flex cable width | 5 mm to 8 mm |
| Flex cable thickness | 0.3 mm |
| Interface options | I2C, RGB, MIPI DSI |
| Typical brightness | 1000 to 5000 nits |
| Power consumption | 50 to 100 mW at 1000 nits |
Another important dimension is the viewing angle. Micro OLEDs typically have a wide viewing angle, often 170 degrees or more, because the pixels are so small and the light emission is Lambertian. However, the small active area means that the viewing angle is less relevant for near-eye use, since the eye is directly in front of the display. The optical system usually collimates the light, so the effective viewing angle is determined by the lenses, not the display. The physical dimensions of the display still matter for how the lenses are positioned. The 6.4 mm width allows for a lens diameter of about 8 mm to 10 mm, which is typical for AR.
The weight of the module is also a dimension-related factor. A 0.32 inch micro OLED module weighs about 0.5 grams to 1 gram, depending on the flex cable length and cover glass. That’s light enough to be mounted on a pair of glasses without causing discomfort. The small size also means that multiple displays can be used for stereoscopic vision without adding significant weight. For example, two modules side by side would weigh about 1 to 2 grams total, plus the drive electronics.
In terms of reliability, the dimensions affect how the display handles mechanical stress. The glass substrate is brittle, and the small size makes it more resistant to bending stress because the strain is distributed over a smaller area. However, the flex cable attachment point is a weak spot. The bond between the cable and the glass can fail if the cable is pulled too hard. The recommended pull force is usually less than 5 Newtons. The module dimensions also determine the minimum bend radius for the flex cable, which is typically 1 mm to 3 mm. This is important for tight enclosures.
Let’s talk about the optical stack dimensions. The micro OLED has several layers: the silicon backplane (0.5 mm to 0.8 mm), the organic emissive layers (a few hundred nanometers), the encapsulation layer (0.1 mm to 0.3 mm), and optionally a cover glass (0.4 mm to 0.7 mm). The total optical path length from the emissive layer to the top surface is about 0.5 mm to 1.0 mm. This affects the focus distance for the lenses. In AR, the display is placed at the focal plane of the lens, so the thickness of the stack must be accounted for in the optical design. A thinner stack allows for a more compact optical module.
The 0.32 inch size also influences the yield in manufacturing. Smaller displays have more die per wafer, which reduces cost per unit. A 6-inch wafer can yield hundreds of 0.32 inch micro OLED dies, compared to dozens for larger sizes. The dimensions are chosen to balance resolution, pixel density, and cost. The 800x600 resolution at this size is a sweet spot for many applications because it provides enough detail for text and icons without requiring extremely fine lithography.
Finally, let’s look at a specific example. The product from DisplayModule (the one linked above) has these exact dimensions. The active area is 6.4 mm x 4.8 mm, and the module size is 13.5 mm x 11.0 mm x 1.5 mm. It supports I2C, RGB, and MIPI interfaces, which gives flexibility for different controllers. The flex cable is 30-pin with a pitch of 0.3 mm. The brightness is up to 5000 nits for HUD applications. The operating temperature range is -20°C to +70°C. These dimensions make it suitable for integration into custom optics and enclosures. The mechanical drawing provided by the manufacturer includes all the critical dimensions, including the location of the alignment holes and the center of the active area. Always check the specific datasheet for your application, as tolerances and connector positions can vary between batches.