What Is Matrix Display? A Grid Arrangement of Pixels

Whatever we're looking at – a mobile phone screen, a bus stop sign or a huge advertising display in the middle of a city – the technology behind it is always the same: matrix display.

Matrix display involves arranging lots of light-emitting units (pixels) into a regular grid. Each pixel can be controlled separately. Each pixel is identified by row and column coordinates, allowing the controller to turn any specific pixel on or off.

How Does It Work? Row-Column Scanning and Persistence of Vision

Every matrix display screen is composed of a vast number of pixels. To ensure these pixels operate in an organized manner, an efficient control method is required.

1. Row-Column Scanning: A Method to Reduce Control Lines

Picture a grid made up of 8x8 pixels, which adds up to 64 squares. If you connected a special control line to every square, you'd need 64 lines, which would take up a lot of space. A matrix display, on the other hand, only needs 16 lines in total: 8 row lines and 8 column lines. If you pick a row and column, the controller can find the pixel where they meet at the point where they cross over. This technique is known as "row-column scanning."

2. Dynamic Scanning: Leveraging the Human Eye's Persistence of Vision

The controller can only light up certain pixels in a single row at a time. To display a complete image, it scans row by row – from the first to the last – at high speed, continuously updating the pixel data for each row. Thanks to the human eye's "persistence of vision" effect (where an image lingers briefly after being seen), this rapid scanning creates the appearance of a continuous, complete image.

From Monochrome to Full Color: The Evolution of Key Technologies

1. Passive Matrix vs. Active Matrix

Early displays used something called "passive matrix" technology. This means that the pixels themselves did not store data and relied entirely on the controller's scanning. This approach made the image low in brightness, with poor contrast and narrow viewing angles. Then, engineers added thin-film transistors (TFTs) behind each pixel, which created "active matrix" displays. So, every pixel has its own driving circuit, which means it can keep its display state until the next refresh cycle. This tech made a huge difference to how good displays on phones and laptops were.

2. From Monochrome to Full Color

The first displays used only one colour (like red) and were used to show simple numbers and symbols. Later, engineers put red, green, and blue LEDs inside a single pixel unit. By controlling how bright each colour was, they were able to make a full colour display. The use of OLED (organic light-emitting diode) technology has really opened up a lot of possibilities. Each pixel can make its own light, so screens can be made thinner.

Common Applications of Matrix Displays

Large-scale billboards: Big screens in shopping centres and sports stadiums used to show moving images.

Information signs: Information displays at bus stops, airport flight information boards, digital restaurant menus, etc.

Wearable devices and flexible screens: Smartwatches, foldable smartphones, etc.

Future Outlook

Matrix display technology is evolving toward higher resolution, greater intelligence, and increased flexibility. Micro LED technology shrinks LED units to the micrometer scale, surpassing existing OLED technology in terms of brightness, contrast, and lifespan. Meanwhile, transparent screens, foldable displays, and rollable televisions are gradually transitioning from the laboratory to the commercial market. In the future, the integration of matrix display technology with gesture interaction and artificial intelligence will unlock a wider range of application scenarios.