Display Modules

A high-quality display module is essential for visualizing data in your Arduino, ESP32, or Raspberry Pi projects. Whether you need a high-contrast I2C OLED for a compact wearable, a vibrant SPI TFT LCD for a smart home dashboard, or an ultra-low-power E-Paper display for an IoT weather station, we have the exact screen for your build. Backed by 20 years of electronic retail experience in Sham Shui Po, our technical team provides expert component matching and ready-stock availability so you can start coding immediately.

Microcontroller Display Specifications & Interfaces

Selecting the correct screen involves balancing resolution, power consumption, and the available I/O pins on your microcontroller. Here is a technical breakdown of our core display modules:

Display Type Key Technical Features & Interface Best Use Case
OLED Modules (e.g., SSD1306) Self-illuminating pixels, infinite contrast, I2C/SPI (3.3V/5V) Wearable tech, portable instruments, and low-power text readouts.
TFT LCD Modules (e.g., ST7735) Full-color RGB, high refresh rate, SPI/Parallel interface Smart home control panels, graphical user interfaces (GUI), and image rendering.
E-Paper / E-Ink Displays Ultra-low power, retains image without power, SPI interface Electronic shelf labels, smart badges, and battery-powered IoT weather stations.
7-Segment & LED Matrix MAX7219 driver, high brightness, daisy-chainable Digital clocks, counters, and scrolling text marquees.

Important Note (SRAM Limitations & OLED Burn-in): A standard Arduino Uno only has 2KB of SRAM. This is absolutely insufficient to hold a full-color frame buffer for a large TFT LCD (e.g., 3.5-inch). Forcing an Uno to drive a large color display will result in extremely slow refresh rates or instant system crashes. For full-color GUIs, you must upgrade to an ESP32 or Raspberry Pi. Furthermore, OLED screens suffer from physical "burn-in" if a static image is displayed continuously for months. Always implement a screen saver or sleep mode in your code for 24/7 OLED projects.

Frequently Asked Questions (FAQ)

Q: I wired my I2C OLED display perfectly, but the screen remains completely black. Why?
A: The most common issue is an I2C address mismatch. Most SSD1306 OLEDs ship with a default I2C address of either 0x3C or 0x3D. If your Arduino sketch uses the wrong address, the screen will not initialize. We highly recommend uploading an "I2C Scanner" sketch to your board first to verify the exact hardware address before running your display code.

Q: Does an E-Paper display really consume zero power?
A: It consumes zero power only when the image is static (you can even disconnect the power wires, and the image will remain on the screen). However, during the "refresh" cycle (which takes 2 to 5 seconds), it actively draws power. Therefore, E-Paper is perfect for a dashboard that updates once an hour, but it is a terrible choice for a digital stopwatch or fast-moving animations.