0755-25695467
sales@cntftlcd.com
en
Shenzhen Wu He Tian Cheng Technology Co., Ltd.
Shenzhen Wu He Tian Cheng Technology Co., Ltd.
Products

Comparison of UART LCD Display and Parallel LCD

What is the difference between a UART LCD Display and a parallel LCD screen, and how should we choose between them? With these questions in mind, let's have a detailed look at UART LCD Display and parallel LCD screens.

Comparison of UART LCD Display and Parallel LCD

Basic Concepts of UART LCD Display and Parallel LCD Screens

  • UART LCD Display: This type of LCD screen is controlled via a serial interface, specifically a TFT LCD display module that communicates through a serial port, typically UART or SPI. The serial screen module consists of the display driver board, LCD screen casing, and the LCD itself. It receives commands sent from a microcontroller's serial port and displays all images on the LCD screen.

  • Parallel LCD Screen: This type of LCD screen is controlled via a parallel interface, specifically a TFT LCD display module that communicates through a parallel port, usually an LPT port. In a parallel interface, data bits are transmitted in parallel, typically in units of bytes (8 bits) or words (16 bits).

Differences Between UART LCD Display and Parallel LCD Screens

  • Pin Types: A UART LCD Display requires only 2 wires for communication, whereas a parallel LCD screen needs multiple wires for connection.

  • Data Transmission Speed: Using a metaphor, UART LCD Display is like a single-lane road, while a parallel screen is like an 8-lane road where 8-bit data can be transmitted simultaneously. Although it seems the parallel screen might transmit faster, this is not the case. Due to interference among the 8 channels, data transmission speed is constrained, and if there's an error, all 8 bits need to be resent simultaneously. For serial screens, there is no such interference and any errors require resending only the erroneous bit, making serial transmission faster overall.

  • Program Comparison: Currently, most UART LCD Displays on the market are smart and easy to use. In contrast, using a parallel LCD screen is far more complex. UART LCD Display requires 90% less coding than parallel screens, and many UART LCD Displays can be directly controlled without installing an MCU (Microcontroller Unit).

  • User Interface Comparison: UART LCD Display comes with dedicated interface software that can be downloaded directly, making them easy to use and suitable for complex and visually rich displays with a lot of text. Parallel LCD screens are better suited for simple interfaces, real-time data acquisition, and high-speed graphics drawing.

  • System Structure Comparison: UART LCD Display mainly includes components like a serial communicator, Flash controller, LCD display controller, SDRAM controller, and bus controller. They receive commands through the serial port, decode them, and display the corresponding images. Pictures and fonts are pre-stored in Flash memory for direct invocation. Parallel LCD screens are composed of components like an LCD display controller, SDRAM controller, and parallel port controller. They perform real-time data storage and display under clock control, showing the data as it is received.

How to Choose Between UART LCD Display and Parallel LCD Screens

Selection should be based on factors like cost, programming, display interface, display size, and system structure to arrive at the optimal display solution. Choosing between a UART LCD Display and a parallel LCD screen mainly depends on application requirements and system resources. UART LCD Display uses fewer pins, making them suitable for microcontrollers with limited resources and long-distance communication, albeit at a slower data transfer rate. Parallel LCD screens offer faster data transfer speeds, making them suitable for applications requiring high refresh rates, but they require more pins and more complex wiring. Therefore, if resources are limited and high speed is not critical, choose a UART LCD Display. If high speed is needed and sufficient resources are available, choose a parallel LCD screen.


PREV :
What Is a TFT LCD?
NEXT :
LCD Display Module Industry: Production Technology Currently Very Mature

Featured LCD Products

Other Microgrid Energy Management System News