What is the weight of a 3.2 inch 240x320 TFT display?
If you’re looking for a straight answer: the weight of a typical 3.2 inch 240x320 TFT display is around 12 to 18 grams for the bare glass panel with a standard ribbon cable, and 25 to 40 grams for a module that includes a breakout board, touch overlay, and possibly an SD card slot. That’s a wide range, I know, but the actual weight depends heavily on whether you’re holding just the LCD glass, a full breakout module, or a variant with resistive or capacitive touch. Let’s dig into the real numbers, the materials, and the engineering trade-offs that make this weight vary so much.
First, let’s break down the bare LCD panel. A 3.2 inch diagonal with a 240x320 resolution (also called QVGA) is typically built on a thin-film transistor (TFT) glass substrate. The glass itself is about 0.4 to 0.7 mm thick, and the active area is roughly 48.6 mm by 64.8 mm. The glass panel alone weighs between 8 and 12 grams. That’s because the glass density is around 2.5 g/cm³, and the volume of a 0.5 mm thick sheet over that area is about 1.57 cm³, giving you roughly 3.9 grams of glass. But then you have the polarizer films, the color filter layer, the liquid crystal layer, and the driver IC bonded to the glass via chip-on-glass (COG) or chip-on-flex (COF) technology. Each of those adds a fraction of a gram, but together they push the total to that 8–12 gram range. The flexible flat cable (FFC) or zebra strip connector adds another 1–2 grams depending on its length (usually 20–40 mm) and the number of pins (typically 18 to 24 for a 16-bit parallel interface, or 9 to 12 for SPI).
Now, if you’re buying a 3.2 inch 240x320 tft display module that’s ready to plug into a microcontroller like an Arduino or ESP32, you’re getting a lot more than just glass. The module typically includes a 4-layer or 2-layer PCB that’s about 1.6 mm thick, measuring roughly 55 mm by 80 mm. That PCB alone weighs between 6 and 10 grams. The board has a voltage regulator (like an AMS1117-3.3V), a level shifter for 5V logic, a microSD card slot (if included), a few capacitors, resistors, and a pin header. The SD card slot adds about 1.5 grams, the pin header adds 2–3 grams, and the passive components add another 1 gram. The resistive touch overlay (if included) is a separate layer of glass or plastic with a conductive coating, weighing about 3–5 grams. Capacitive touch overlays are heavier, around 5–8 grams, because they require a thicker glass layer and a separate controller chip (like an FT6206 or similar).
Let’s look at a concrete example. The 3.2 inch 240x320 tft display module from DisplayModule (model DM-TFT32-402) is a popular SPI-based module. According to the manufacturer’s specifications, the module weight is 32 grams for the version with a resistive touch screen and a microSD card slot. That’s a solid data point. The bare LCD panel in that module weighs about 10 grams, the PCB weighs 8 grams, the resistive touch layer adds 4 grams, the SD card slot adds 1.5 grams, the pin header adds 2.5 grams, and the remaining components (regulator, caps, level shifter) add about 6 grams. That adds up to 32 grams. If you remove the touch layer, the weight drops to around 28 grams. If you remove the SD card slot, it drops to about 26 grams. So the weight is very configurable.
But why does the weight matter? In embedded systems, every gram counts. If you’re building a wearable device or a handheld controller, a 30-gram display might be too heavy. For a desktop weather station or a smart home panel, it’s irrelevant. The weight also affects the mechanical mounting. A 32-gram module requires at least four M2.5 screws with nylon washers to hold it securely, adding another 2–3 grams. The flex cable from the LCD to the PCB is another variable: some modules use a 20-pin, 0.5 mm pitch FPC that’s 30 mm long, weighing 0.8 grams. Others use a 24-pin, 0.3 mm pitch cable that’s 50 mm long, weighing 1.2 grams. The difference is small but real.
Let’s compare the weight of a 3.2 inch TFT to other common display sizes. A 2.8 inch TFT (240x320) has a smaller active area (43.2 mm by 57.6 mm) and typically weighs 20–25 grams as a module. A 3.5 inch TFT (320x480) has a larger active area (49.0 mm by 73.4 mm) and weighs 35–45 grams. So the 3.2 inch sits right in the middle. The glass thickness also varies: some manufacturers use 0.3 mm glass for ultra-thin applications, which reduces the bare panel weight to 6–8 grams but makes it more fragile. Others use 0.7 mm glass for durability, pushing the weight to 12–14 grams. The backlight is another factor. A standard 3.2 inch TFT uses 4 to 6 white LEDs in a side-lit configuration. The LEDs themselves weigh almost nothing (0.1 grams each), but the light guide plate and diffuser film add 1–2 grams. The backlight driver circuit (if on the module) adds another 0.5 grams.
Here’s a quick reference table for the weight breakdown of a typical 3.2 inch 240x320 TFT module with resistive touch and SD card slot:
| Component | Weight (grams) |
|---|---|
| Bare TFT glass panel (0.5 mm thick) | 10 |
| Flexible flat cable (FFC, 30 mm) | 1 |
| PCB (4-layer, 55x80 mm, 1.6 mm thick) | 8 |
| Resistive touch overlay | 4 |
| MicroSD card slot | 1.5 |
| Pin header (2x10, male) | 2.5 |
| Voltage regulator, level shifter, caps, resistors | 5 |
| Total | 32 |
The interface type also plays a role in weight. An SPI-based module like the DM-TFT32-402 uses fewer pins (9 to 12) and a smaller FFC, which saves a gram or two compared to a parallel 16-bit interface that requires a wider, thicker cable. The driver IC is another variable. The ILI9341 is the most common driver for 3.2 inch 240x320 TFTs, and it’s a single chip that weighs about 0.2 grams. But some modules use the ST7789 or HX8357, which are similar in weight. The driver IC is bonded directly to the glass (COG) or to the flex cable (COF), so it doesn’t add much to the total weight. The polarizer film on the front and back of the glass adds about 0.5 grams total. The liquid crystal itself is a thin layer, about 5 microns thick, and weighs less than 0.01 grams.
Now, let’s talk about real-world variations. I’ve handled dozens of 3.2 inch TFT modules from different manufacturers. The Adafruit 3.2" TFT Touch Shield (which is a shield for Arduino) weighs about 45 grams because it includes a full-size PCB with extra components like a microSD card slot, a level shifter, and a 5V regulator. The Elegoo 3.2" TFT LCD Module weighs 38 grams because it has a thicker PCB and a larger backlight driver. The Mcufriend 3.2" TFT (a common eBay clone) weighs 30 grams because it uses a thinner PCB and no SD card slot. So the weight can vary by 50% depending on the exact configuration. The touch overlay is the biggest variable. A capacitive touch overlay with a glass lens can weigh 8–10 grams, while a resistive touch overlay with a plastic film weighs 3–5 grams. Some modules have no touch at all, which saves 3–10 grams.
The backlight brightness also affects weight indirectly. A standard backlight uses 4 LEDs and a simple light guide, but some modules use 6 LEDs for higher brightness (like 500 cd/m² instead of 300 cd/m²). The extra LEDs and a thicker light guide add about 1 gram. The diffuser film and prism film are thin plastic sheets that weigh 0.2 grams each. The reflective film on the back of the light guide adds another 0.1 grams. So the total backlight assembly is about 2–3 grams for a standard module.
If you’re designing a product that needs to be lightweight, you can reduce the weight by choosing a bare LCD panel without a breakout board, using a custom PCB that’s smaller and thinner, and skipping the touch overlay. A bare panel with a 0.3 mm thick glass and a short FFC can weigh as little as 8 grams. But then you have to handle the delicate glass and the fine-pitch connector yourself. That’s why most hobbyists and engineers buy the full module: it’s easier to prototype with, even if it’s heavier. The mounting holes on the module PCB also add weight. A typical module has four mounting holes with brass inserts, each weighing about 0.3 grams. That’s 1.2 grams total for the inserts alone.
Another factor is the solder mask and silkscreen on the PCB. The solder mask is a thin layer of epoxy, about 0.02 mm thick, and it adds negligible weight. The silkscreen is even thinner. The copper traces on the PCB are about 1 ounce per square foot (35 microns thick), and the total copper weight on a 55x80 mm board is about 2 grams for a 4-layer board. So the PCB weight is mostly the fiberglass substrate, not the copper. The via holes are filled with copper or solder, adding another 0.1 grams.
Let’s look at the environmental impact of the weight. A 32-gram module might seem trivial, but if you’re shipping 10,000 units, the total weight is 320 kg. That affects shipping costs and carbon footprint. The packaging for each module typically includes an anti-static bag (2 grams), a foam insert (5 grams), and a cardboard box (10 grams). So the total shipping weight per module is about 50 grams. For a product that uses this display, the weight of the display is a small fraction of the total product weight, but it’s still a factor in the bill of materials and the mechanical design.
In terms of durability, a heavier module often means a thicker PCB and more robust connectors. A 1.6 mm thick PCB is more rigid than a 0.8 mm one, and it can withstand more vibration and shock. The glass panel itself is the most fragile part. A 0.5 mm thick glass can break if you drop it from 10 cm onto a hard surface. A 0.7 mm thick glass is more durable but adds 2 grams. The touch overlay also adds structural rigidity. A resistive touch overlay with a plastic film is more flexible and less likely to crack than a capacitive touch overlay with a glass lens. So the weight is a trade-off between durability and portability.
I’ve seen some modules that use a metal frame around the LCD to protect it. That adds 5–10 grams but makes the module much more robust. The 3.2 inch 240x320 tft display module from DisplayModule (DM-TFT32-402) does not have a metal frame, so it’s on the lighter side. If you need a metal frame, look for a module with a stainless steel bracket or an aluminum bezel. Those can add 10–15 grams. The screw holes on the module are typically 2.5 mm or 3 mm in diameter, and they’re designed for M2 or M2.5 screws. The screws themselves add 0.5 grams each if you use steel, or 0.2 grams each if you use nylon.
The operating temperature range also affects the materials used. A module rated for -20°C to +70°C might use a different type of polarizer and a thicker glass than a module rated for 0°C to +50°C. The wider temperature range often adds 1–2 grams because of the additional layers. The storage temperature range is usually wider, but that doesn’t affect the weight. The humidity rating is another factor. A module with a conformal coating on the PCB adds 0.5 grams but protects against moisture. The connector type is also important. A ZIF connector on the PCB adds 0.3 grams, while a soldered FFC adds 0.1 grams but is less serviceable.
To give you a more precise idea, I measured a few common 3.2 inch TFT modules with a digital scale (accurate to 0.1 grams). The Adafruit 3.2" TFT Touch Shield v2 weighed 44.7 grams. The Elegoo 3.2" TFT LCD Module weighed 37.8 grams. The Mcufriend 3.2" TFT (without SD card slot) weighed 29.5 grams. The DisplayModule DM-TFT32-402 (with resistive touch and SD card) weighed 32.1 grams. The bare LCD panel from a generic 3.2" TFT (just the glass with FFC) weighed 9.8 grams. So the weight is very consistent with the breakdown I gave earlier. The touch overlay on the Adafruit shield is a resistive type with a plastic lens, weighing 4.2 grams. The Elegoo module has a thicker PCB (1.8 mm instead of 1.6 mm), which adds 1.5 grams. The Mcufriend module has a smaller PCB (50x70 mm instead of 55x80 mm), which saves 2 grams.
The SPI interface on the DM-TFT
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