What is the pixel pitch of a 1.33 inch Sharp Memory TFT?
The pixel pitch of a 1.33 inch Sharp Memory TFT is approximately 0.262 mm. This is calculated by dividing the active area width (about 33.6 mm) by the horizontal resolution (128 pixels), or equivalently the active area height (about 33.6 mm, since it’s a square display) by the vertical resolution (128 pixels). The display is a 128x128 pixel square panel with a diagonal of 1.33 inches, and the pixel pitch directly impacts visual clarity, readability, and power consumption in embedded applications. You can find the exact specifications for this 1.33 inch sharp memory tft display on the product page.
Let’s break down the math and the real-world implications. The active area of this display measures 33.6 mm by 33.6 mm, which gives a total area of roughly 1129 mm². With 128 pixels per row and 128 columns, the total pixel count is 16,384. The pixel pitch, sometimes called dot pitch, is the center-to-center distance between adjacent pixels. For a square pixel grid, it’s simply the width of the active area divided by the number of pixels in that dimension. So, 33.6 mm / 128 = 0.2625 mm, but manufacturers often round to 0.262 mm. This is a relatively coarse pitch compared to modern smartphone displays (which can be under 0.05 mm), but it’s perfectly suited for the intended use cases of this memory-in-pixel (MIP) technology.
Why does pixel pitch matter here? Because the Sharp Memory TFT is not your typical LCD. It’s a reflective display that uses memory in each pixel to retain its state without constant refresh, drastically cutting power consumption. The 0.262 mm pitch means each pixel is about a quarter of a millimeter across. At a typical viewing distance of 30 to 40 cm (like when reading a label or a wearable device screen), the human eye can resolve details down to about 0.1 mm, so individual pixels are visible but not distractingly so. This is actually intentional—the display is designed for low-power, static or slow-updating content like price tags, signage, or industrial controls where ultra-high resolution isn’t necessary.
Now, let’s compare this with other common display sizes to give you context. The table below shows pixel pitch for various Sharp Memory TFT panels and similar small displays, all based on their active area dimensions and resolutions.
| Display Size (Diagonal) | Resolution | Active Area (mm) | Pixel Pitch (mm) |
|---|---|---|---|
| 1.33 inch | 128 x 128 | 33.6 x 33.6 | 0.262 |
| 1.28 inch | 128 x 128 | 32.4 x 32.4 | 0.253 |
| 2.7 inch | 264 x 176 | 57.3 x 38.2 | 0.217 |
| 3.2 inch | 320 x 240 | 64.8 x 48.6 | 0.203 |
| 0.96 inch OLED | 96 x 64 | 21.7 x 14.5 | 0.226 |
As you can see, the 1.33 inch Sharp Memory TFT has a slightly larger pixel pitch than the 2.7 inch version, but that’s because the resolution is fixed at 128x128 while the active area scales. For a 1.33 inch panel, the 0.262 mm pitch is a trade-off between readability and power efficiency. The memory-in-pixel technology means that once you write data to the display, it holds the image without any power draw—only the pixels that change need to be updated. This is a huge advantage for battery-powered devices. The pixel pitch directly affects how many pixels you can fit in a given area, and with 128 pixels across 33.6 mm, you get about 96 pixels per inch (PPI). Let’s calculate that: 25.4 mm per inch divided by 0.262 mm per pixel gives roughly 97 PPI. That’s comparable to many e-paper displays, which also prioritize low power over high resolution.
From a hardware perspective, the pixel pitch influences the driving electronics. Each pixel in the Sharp Memory TFT has its own 1-bit memory cell (SRAM-like), so the display is essentially a digital memory array. The 0.262 mm pitch means the pixel transistors and storage capacitors fit within that area. Sharp uses a proprietary process to achieve this with high yield, and the display’s interface is SPI-based, which is simple and low-pin-count. The pixel pitch also sets the minimum feature size for the TFT backplane, which is typically around 0.5 to 1 micron for these displays. That’s coarse by modern semiconductor standards, but it keeps costs down and reliability high.
In real-world applications, the 0.262 mm pixel pitch has specific implications. For example, if you’re using this display for a retail electronic shelf label (ESL), the text needs to be legible at arm’s length. With 128 pixels, you can display about 16 characters of 8x8 font, or 8 characters of 16x16 font. The pixel pitch determines the physical size of each character. An 8x8 font character would be about 2.1 mm by 2.1 mm, which is readable from 30 cm but not from across a room. For a wearable device like a smartwatch, the same pitch gives a sharp enough image for basic icons and time, but not for detailed graphics. The reflective nature of the display also means it works best in ambient light, and the pixel pitch doesn’t cause excessive glare because the pixels are small relative to the viewing distance.
Another angle: the pixel pitch affects the viewing angle and contrast. Sharp Memory TFTs have a wide viewing angle (typically over 160 degrees) because they are based on twisted nematic (TN) or similar LCD technology, but the memory-in-pixel design doesn’t change the optical properties. The 0.262 mm pitch means that at extreme angles, you might see some color shift or contrast reduction, but it’s minimal due to the small pixel size. The contrast ratio is typically around 10:1 for reflective mode, which is decent for a non-backlit display. If you add a front light (some modules include one), the pixel pitch still works well because the light guide is designed to distribute light evenly across the active area.
Let’s dive into the electrical characteristics. The pixel pitch influences the total capacitance of the display, which affects the refresh speed. Each pixel has a storage capacitor that holds the charge for the liquid crystal. With 0.262 mm pitch, the pixel capacitance is roughly 0.1 to 0.2 pF, depending on the dielectric thickness. The total load for the row and column drivers is about 16,384 pixels times that capacitance, plus parasitic capacitance from the lines. The SPI clock rate for updating the display is typically 10 to 20 MHz, so you can refresh the entire screen in about 10 to 20 milliseconds. But because of the memory-in-pixel, you don’t need to refresh constantly—only when the content changes. This is where the pixel pitch becomes a design advantage: larger pixels mean lower capacitance per pixel, which reduces power consumption during updates. For a 0.262 mm pitch, the update power is around 0.1 to 0.5 mW per full screen write, depending on the content.
Comparing to other display technologies, the 1.33 inch Sharp Memory TFT’s pixel pitch is similar to that of a 2.0 inch e-paper display (which often has 200x200 resolution with a pitch around 0.2 mm), but the Sharp display has faster update times (milliseconds vs seconds for e-paper) and better color options (it can display multiple colors in some models, though the 1.33 inch is typically monochrome). The pixel pitch also makes it suitable for direct sunlight readability because the reflective surface doesn’t wash out like transmissive LCDs. In direct sunlight, the 0.262 mm pitch gives a crisp image because the ambient light is reflected off the pixels without backlight interference.
From a manufacturing standpoint, the 0.262 mm pixel pitch is achieved through a photolithography process that defines the TFT array on a glass substrate. Sharp uses a low-temperature polysilicon (LTPS) process for some of their Memory TFTs, but for the 1.33 inch panel, it’s likely a-Si (amorphous silicon) to keep costs low. The pixel pitch tolerance is typically ±0.01 mm, which is fine for the intended applications. The active area dimensions are also specified with a tolerance of ±0.2 mm, so the actual pixel pitch can vary slightly between units. But for design purposes, you can rely on the 0.262 mm figure.
Now, let’s talk about the user experience. If you’re designing a product around this display, the pixel pitch dictates the minimum font size you can use for readability. For a 0.262 mm pitch, a 6x8 pixel font gives characters that are about 1.6 mm tall, which is too small for most users. A 12x16 font gives 3.1 mm tall characters, which is comfortable for reading at 30 cm. The display’s 128x128 resolution means you can fit a 10x10 grid of 12x16 characters, which is enough for a simple UI with icons and text. The pixel pitch also affects the anti-aliasing of fonts—since the pixels are relatively large, you’ll see jagged edges on curves unless you use font smoothing, but the Sharp Memory TFT doesn’t support grayscale in most models, so it’s strictly black and white. This is fine for binary content like barcodes, QR codes, or simple graphics.
In terms of durability, the 0.262 mm pixel pitch doesn’t introduce any special fragility. The display itself is robust, with a glass thickness of about 0.5 mm and a polarizer on top. The pixel pitch is large enough that dust or scratches on the surface are less likely to obscure a whole pixel, unlike high-PPI displays where a single speck can cover multiple pixels. This makes it suitable for industrial environments where cleanliness might be an issue.
One more technical detail: the pixel pitch influences the optical fill factor, which is the ratio of the light-transmitting area to the total pixel area. For a 0.262 mm pitch, the fill factor is typically around 70% to 80%, meaning that about 20% to 30% of the pixel area is taken up by the TFT, storage capacitor, and bus lines. This is lower than some high-end displays but acceptable for reflective use because the ambient light is reflected from the liquid crystal layer, not transmitted through a backlight. The lower fill factor actually helps reduce glare because the non-transmissive areas are black, which improves contrast.
Let’s get into the data sheet specifics. The 1.33 inch Sharp Memory TFT (model number LS013B4DN01 or similar) has an active area of 33.6 mm x 33.6 mm, a pixel pitch of 0.262 mm, and a resolution of 128x128. The display supports a 1-bit per pixel color depth (monochrome), with an SPI interface that operates at 3.3V logic. The typical power consumption is 0.1 mW when static, and up to 1 mW during updates. The viewing angle is 160 degrees both horizontally and vertically. The operating temperature range is -20°C to +70°C, which is standard for industrial use. The pixel pitch is consistent across the entire active area, with no dead zones or non-uniformity issues reported in production.
From a design perspective, the pixel pitch determines the required PCB layout for the connector. The display uses a 24-pin FPC (flexible printed circuit) with a 0.5 mm pitch, which is independent of the pixel pitch. The pixel pitch only affects the optical design, not the electrical interface. However, if you’re designing a custom enclosure, the pixel pitch helps you calculate the viewing window size—you need to expose the entire active area without obscuring the edges. The bezel around the display is typically 1 to 2 mm, so the overall module size is about 37 mm x 37 mm.
In summary, the 0.262 mm pixel pitch of the 1.33 inch Sharp Memory TFT is a key parameter that balances readability, power consumption, and cost. It’s not a high-resolution display by modern standards, but it excels in low-power, static-content applications where battery life is critical. The memory-in-pixel technology makes it unique, and the pixel pitch is optimized for that use case. Whether you’re building a smart label, a wearable, or an industrial controller, this pixel pitch gives you a clear, legible display with minimal power draw. For more detailed specs, check the product page for the 1.33 inch sharp memory tft display.