為什麼大多數 3.5 吋 TFT 顯示器透過 MCU 介面連接？

MCU的平行介面主要適用於：單色字元型LCD、單色圖形液晶顯示幕, and small-sized TFT color screens (usually 3.5 inches and below). Due to its simple driving and fast development, it is very suitable for embedded systems directly controlled by single-chip micro-controllers. Among various display interfaces, the MCU interface is widely used in small-sized TFT color screens. Especially in devices using embedded micro-controllers as the main control, the MCU interface can simplify system connections, reduce the complexity of hardware design, and provide convenience for graphic interface development.

什麼是MCU介面？

The so-called MCU interface is also known as the parallel interface (Parallel Interface). There are two types of this interface: Intel 8080 timing and Motorola 6800 timing. The most common one is 8080. The MCU interface is a common parallel or serial display communication method. In TFT LCD modules, the MCU interface usually communicates with the main control chip through the command register and the display data register. The main control sends instructions, pixel data, and necessary control signals to achieve image display. Unlike the RGB interface that continuously transmits pixel data, many MCU interfaces have TFT display modules that integrate display driver ICs and memory inside. After the main controller writes the image data into the memory of the display controller, the display can continuously refresh the screen by itself, without the need for the main controller to continuously send the entire image data.

在工業控制、智慧儀器、醫療設備、家用電器、嵌入式終端等應用領域，3.5吋TFT彩色顯示屏是常見的顯示解決方案。對於產品開發工程師來說，選擇合適的顯示器不僅需要考慮解析度、亮度、色彩表現和顯示尺寸，還需要綜合評估介面類型、主控晶片效能、系統成本和軟體開發難度。

為什麼3.5吋TFT顯示器通常配備MCU介面？

1、解析度足夠使用

2.對主控制器要求低，綜合成本可控制

3.初始化簡單，上電過程快，穩定。

4.供應鏈成熟，客製化空間大。

關於3.5吋TFT顯示屏，幾個常見問題解答如下：

Q1：MCU介面可以顯示動態視訊嗎？

Yes, but the smoothness depends on the screen refresh rate. Simple animations, scroll bars, progress bars can be played without issues; for playing high-definition smooth videos, it is recommended to use the RGB interface or reduce the resolution.

Q2：8位元和16位元匯流排，選擇哪一種？

The 16-bit bus offers faster screen refresh and better color reproduction; the 8-bit bus saves pins and is suitable for controllers with limited pins. Both can be used at 320x240, depending on your pin and speed requirements.

Q3：這款螢幕可以採用全視視角（IPS）技術嗎？

Yes. 3.5-inch models can adopt the IPS full-viewing-angle solution. The viewing angle extends from approximately 12 o'clock on the top.

Q4：工業環境和一般屏有什麼差別嗎？

Yes. For industrial scenarios, attention should be paid to wide temperature range (-30 to 80℃), high brightness, anti-static properties, and anti-glare features. For the same 3.5-inch TFT Module, the material selection and testing standards for industrial and consumer grades are completely different. When selecting the components, it is essential to clearly specify the usage environment.