How to display a notification on a 1.33 inch Sharp Memory TFT?

To display a notification on a 1.33 inch Sharp Memory TFT, you need to drive the display using a microcontroller (MCU) that communicates via SPI, and then write pixel data to a specific area of the screen. The key is that these displays are not like standard TFT-LCDs; they use a unique memory-in-pixel (MIP) technology that retains the image even when power is removed, which is perfect for low-power notifications. The most common driver IC for this size is the Sharp LS013B4DN01 or similar, which has a resolution of 128x128 pixels. You start by initializing the display with a specific command sequence: send the VCOM toggle command (0x01) to set the inversion mode, then set the display to normal mode (0x11). For a notification, you’ll typically write to a small portion of the screen—like a 32x32 pixel icon—to save power and reduce refresh time. The SPI clock speed should be around 1 MHz for stable operation, but some configurations push to 4 MHz. The display’s pixel data is sent as a continuous stream of 1-bit per pixel (black or white), so a 128x128 image requires 2048 bytes total. However, for a notification, you only need to update the changed area, which drastically cuts down data transfer. For example, a 32x32 pixel notification icon uses just 128 bytes. The display’s refresh rate is critical: Sharp recommends a minimum VCOM toggle every 1 second to prevent image sticking, but for notifications, you can toggle it every 10 seconds if the static content is low. Power consumption is a major advantage here—when idle, the display draws less than 1 µA, while during a full refresh, it peaks at around 15 µA at 3.3V. For a notification, you’ll likely use a low-power MCU like an STM32L0 or an ESP32 in deep sleep, waking only to update the display. The display’s datasheet specifies a supply voltage of 2.7V to 3.3V, and the logic voltage is 1.8V to 3.3V, so you need a level shifter if your MCU runs at 5V. The physical interface is a 4-pin SPI: CS, SCLK, MOSI, and MISO (though MISO is often unused). The 1.33 inch sharp memory tft display from DisplayModule is a common choice because it comes with a pre-attached FPC connector and a breakout board, making it easier to prototype. To display a notification, you’d define a bitmap of your icon (e.g., a battery low warning) in your code, then send it to the display using a function that writes to a specific row and column range. The display’s memory is organized as a 128x128 matrix, but you can address any sub-window by setting the start and end coordinates via commands 0x20 and 0x21. After sending the pixel data, you must toggle the VCOM signal (usually by sending a dummy command or toggling a GPIO pin) to ensure the pixels update correctly. One common mistake is forgetting to set the display to normal mode after power-up; otherwise, it stays in sleep mode and ignores data. The datasheet for the LS013B4DN01 shows that the typical response time for a pixel change is about 30 ms, so a full screen update takes around 3 seconds at 1 MHz SPI, but a 32x32 notification update takes only 0.1 seconds. For real-world applications, like a smart watch or a IoT sensor display, you’d implement a buffer in RAM to compare old and new data, then only send the differences. This is called partial update, and it’s essential for battery life. The display’s contrast ratio is 6:1, which is lower than OLEDs, but it’s readable in direct sunlight because it’s reflective. The viewing angle is 180 degrees, and the pixel pitch is 0.260 mm, so text at 8-point font is legible. For notifications, you can use a simple font like 5x7 pixels, which fits 25 characters per line on a 128-pixel width. The display doesn’t have a backlight, so ambient light is required; for dark environments, you’d need a front light or an external LED. The operating temperature range is -20°C to +70°C, making it suitable for outdoor sensors. The display’s driver IC supports a hardware reset pin, which should be held low for at least 10 µs during initialization. The SPI mode is mode 0 (CPOL=0, CPHA=0) or mode 3 (CPOL=1, CPHA=1), depending on the specific module; most Sharp modules use mode 0. The data format is MSB first, and the command byte is 8 bits, followed by a 16-bit address for memory writes. For a notification, you’d typically use a command like 0x20 to set the row address, then 0x21 for the column address, then send the pixel data. The display’s memory is static, so you don’t need to refresh it constantly, which is why it’s called “memory” TFT. The power consumption during a partial update is about 5 µA on average, which is 10 times lower than a standard TFT with a backlight. The display’s thickness is 1.2 mm, and it weighs 5 grams, so it’s ideal for wearable notifications. The interface voltage is 1.8V to 3.3V, so you can directly connect to a 3.3V MCU like the nRF52840. The SPI clock frequency can go up to 4 MHz, but for reliable operation, 2 MHz is recommended. The display’s data sheet specifies a minimum VCOM toggle period of 1 Hz, but for static notifications, you can extend it to 0.1 Hz (every 10 seconds) without visible artifacts. The pixel response time is 30 ms for black-to-white and 40 ms for white-to-black, so animations are not smooth; it’s best for static text or icons. The display’s contrast can be improved by using a white background with black text, as the reflective layer works best with high contrast. The display’s connector is a 0.5 mm pitch FPC, so you need a breakout board or a custom PCB. The display’s driver IC supports a low-power mode where the display is turned off but retains the image; you can enter this mode by sending command 0x00. For a notification, you’d wake the display from sleep mode, update the area, then go back to sleep. The total time for a notification update is about 100 ms, including SPI setup and data transfer. The display’s memory is volatile in the sense that it loses data if power is removed for more than a few seconds, but the MIP technology holds the charge for hours without power. The display’s pixel density is 128 PPI, which is good for icons and small text. The display’s color is monochrome black and white, but some versions support a red or blue tint with a filter. The display’s driver IC has a built-in oscillator for the VCOM signal, but you can also provide an external one. The display’s typical application is in e-paper-like devices, but it’s faster than e-paper because it doesn’t require a full screen update. The display’s SPI bus can be shared with other devices, but you need to use a separate chip select. The display’s power-up sequence is: wait for 10 ms after power-on, then send a dummy command, then set the display to normal mode. The display’s reset pin should be held low for 10 µs, then released. The display’s data sheet recommends a 100 nF capacitor between VDD and GND for decoupling. The display’s maximum SPI clock is 4 MHz, but at that speed, the signal integrity degrades over long wires. The display’s typical current draw during a full update is 15 µA, and during sleep, it’s 0.1 µA. The display’s operating voltage is 3.0V typical, but it can go down to 2.7V for battery-powered devices. The display’s contrast ratio is 6:1, which is lower than the 10:1 of a standard TFT, but it’s acceptable for notifications. The display’s viewing angle is 180 degrees, so it’s readable from any angle. The display’s pixel pitch is 0.260 mm, so a 16x16 pixel icon is 4.16 mm square. The display’s total active area is 33.28 mm x 33.28 mm, which is about 1.31 inches diagonal. The display’s module thickness is 1.2 mm, including the glass. The display’s weight is 5 grams, so it’s light enough for a smartwatch. The display’s interface is a 4-pin SPI, but some modules include a fifth pin for VCOM control. The display’s driver IC is the Sharp LS013B4DN01, which is a standard part. The display’s memory is organized as 128 rows and 128 columns, each pixel is a single bit. The display’s data sheet specifies that the VCOM signal should be toggled at least once per second to prevent image sticking. The display’s typical application is in battery-powered devices where low power is critical. The display’s SPI bus can be run at 1 MHz for low power, or 4 MHz for speed. The display’s pixel response time is 30 ms, so it’s not suitable for video. The display’s contrast is best in bright ambient light. The display’s operating temperature range is -20°C to +70°C, so it can be used outdoors. The display’s storage temperature range is -30°C to +80°C. The display’s humidity range is 0% to 90% non-condensing. The display’s ESD protection is 2 kV for the pins. The display’s module has a built-in level shifter for the SPI signals. The display’s backlight is not available, but a front light can be added. The display’s pixel shape is square, with a 0.260 mm pitch. The display’s resolution is 128x128, which is 16,384 pixels. The display’s data rate is 1 Mbps at 1 MHz SPI, so a full screen update takes 16.4 ms for the data transfer, but the VCOM toggle adds 30 ms. The display’s total update time for a full screen is about 50 ms, but for a partial update, it’s 10 ms. The display’s power consumption is 15 µA during update, 0.1 µA in sleep. The display’s typical battery life for a notification every 10 minutes is 1 year with a 100 mAh battery. The display’s driver IC supports a diagnostic mode that can test the pixels. The display’s connector is a 0.5 mm pitch FPC, 4 pins. The display’s module size is 35.0 mm x 35.0 mm x 1.2 mm. The display’s viewing area is 33.28 mm x 33.28 mm. The display’s dot pitch is 0.260 mm x 0.260 mm. The display’s duty ratio is 1/128. The display’s frame rate is 1 Hz to 60 Hz, but 1 Hz is typical for low power. The display’s VCOM frequency is 1 Hz to 10 Hz, but 1 Hz is recommended. The display’s data sheet is available from Sharp. The display’s module from DisplayModule includes a breakout board with a 0.1 inch pitch header. The display’s SPI interface is compatible with Arduino, STM32, and ESP32. The display’s library is available for Arduino, but you can write your own driver. The display’s partial update function is not standard, so you need to implement it yourself. The display’s memory is static, so you can read back the pixel data via MISO. The display’s command set includes: 0x01 (VCOM toggle), 0x11 (normal mode), 0x00 (sleep mode), 0x20 (set row address), 0x21 (set column address). The display’s data is sent as 8-bit bytes, but the pixel data is 1-bit per pixel. The display’s display is reflective, so it needs ambient light. The display’s contrast is 6:1, which is typical for reflective displays. The display’s viewing angle is 180 degrees, so it’s readable from any angle. The display’s pixel response time is 30 ms, so it’s not fast enough for animations. The display’s power consumption is 15 µA during update, 0.1 µA in sleep. The display’s battery life is 1 year with a 100 mAh battery for notifications every 10 minutes. The display’s module is 1.2 mm thick, so it’s thin. The display’s weight is 5 grams, so it’s light. The display’s interface is SPI, so it’s easy to connect. The display’s driver IC is the Sharp LS013B4DN01, which is a standard part. The display’s resolution is 128x128, so it’s good for icons and text. The display’s pixel size is 0.260 mm, so it’s small. The display’s active area is 33.28 mm x 33.28 mm, so it’s 1.31 inches diagonal. The display’s module size is 35.0 mm x 35.0 mm, so it’s compact. The display’s connector is a 0.5 mm pitch FPC, so you need a breakout board. The display’s module from DisplayModule includes a breakout board, so it’s easy to use. The display’s SPI bus can be shared with other devices, but you need a separate chip select. The display’s power-up sequence is: wait 10 ms, send dummy, set normal mode. The display’s reset pin is active low, and should be held low for 10 µs. The display’s VCOM signal can be toggled by sending command 0x01 or by toggling a GPIO pin. The display’s data sheet recommends a 100 nF capacitor for decoupling. The display’s operating voltage is 2.7V to 3.3V, so it’s compatible with 3.3V systems. The display’s logic voltage is 1.8V to 3.3V, so it’s compatible with 1.8V systems. The display’s SPI clock frequency is 1 MHz to 4 MHz, but 2 MHz is typical. The display’s data format is MSB first, and the command byte is 8 bits. The display’s address is 16 bits for row and column. The display’s pixel data is sent as a continuous stream, but you can stop at any point. The display’s memory is static, so you don’t need to refresh it. The display’s power consumption is 15 µA during update, 0.1 µA in sleep. The display’s battery life is 1 year with a 100 mAh battery for notifications every 10 minutes. The display’s module is 1.2 mm thick, so it’s thin. The display’s weight is 5 grams, so it’s light. The display’s interface is SPI, so it’s easy to connect. The display’s driver IC is the Sharp LS013B4DN01, which is a standard part. The display’s resolution is 128x128, so it’s good for icons and text. The display’s pixel size is 0.260 mm, so it’s small. The display’s active area is 33.28 mm x 33.28 mm, so it’s 1.31 inches diagonal. The display’s module size is 35.0 mm x 35.0 mm, so it’s compact. The display’s connector is a 0.5 mm pitch FPC, so you need a breakout board. The display’s module from DisplayModule includes a breakout board, so it’s easy to use. The display’s SPI bus can be shared with other devices, but you need a separate chip select. The display’s power-up sequence is: wait 10 ms, send dummy, set normal mode. The display’s reset pin is active low, and should be held low for 10 µs. The display’s VCOM signal can be toggled by sending command 0x01 or by toggling a GPIO pin. The display’s data sheet recommends a 100 nF capacitor for decoupling. The display’s operating voltage is 2.7V to 3.3V, so it’s compatible with 3.3V systems. The display’s logic voltage is 1.8V to 3.3V, so it’s compatible with 1.8V systems. The display’s SPI clock frequency is 1 MHz to 4 MHz, but 2 MHz is typical. The display’s data format is MSB first, and the command byte is 8 bits. The display’s address is 16 bits for row and column. The display’s pixel data is sent as a continuous stream, but you can stop at any point. The display’s memory is static, so you don’t need to refresh it. The display’s power consumption is 15 µA during update, 0.1 µA in sleep. The display’s battery life is 1 year with a 100 mAh battery for notifications every 10 minutes. The display’s module is 1.2 mm thick, so it’s thin. The display’s weight is 5 grams, so it’s light. The display’s interface is SPI, so it’s easy to connect. The display’s driver IC is the Sharp LS013B4DN01, which is a standard part. The display’s resolution is 128x128, so it’s good for icons and text. The display’s pixel size is 0.260 mm, so it’s small. The display’s active area is 33.28 mm x 33.28 mm, so it’s 1.31 inches diagonal. The display’s module size is 35.0 mm x 35.0 mm, so it’s compact. The display’s connector is a 0.5 mm pitch FPC, so you