Differences Between MCU-LCD and RGB-LCD Screens

There are many types of LCD screens commonly used, with various interfaces. For example, some are directly driven by the processor, while others are modules with built-in driver ICs.

I previously shared about the differences between 8080 and 6800 interfaces in LCDs.

Now, let’s briefly summarize the differences between MCU screens and RGB screens, as well as the characteristics of other types of screens.

The main difference between MCU-LCD and RGB-LCD screens lies in the location of the video memory:

The video memory for RGB-LCD is served by the system memory, so its size is only limited by the size of the system memory. This allows RGB-LCD to produce larger sizes; for instance, the current 4.3 inches can only be considered entry-level, while 7 and 10 inches are increasingly used in MIDs.

MCU-LCD was designed with the understanding that microcontrollers have smaller memory, so video memory is built into the LCD module. The software updates the video memory through specific display commands, which means MCU screens often cannot be made very large. Additionally, the display update speed is slower than that of RGB-LCD.

The data transmission modes between MCU-LCD and RGB-LCD also differ:

For RGB screens, the video memory needs to be organized properly. Once the display is started, the LCD-DMA automatically sends the video memory to the LCM via the RGB interface.

In contrast, MCU screens require sending commands to modify the internal RAM of the MCU (i.e., you cannot directly access the RAM of the MCU screen). Therefore, the display speed of RGB is significantly faster than that of MCU, and when it comes to playing videos, MCU-LCD is also relatively slow.

For RGB interface LCMs, the host directly outputs the RGB data for each pixel without needing conversion (except for GAMMA correction, etc.). For such interfaces, an LCD controller is needed in the host to generate RGB data and synchronize signals for pixels, rows, and frames.

In other words, traditional MCU screens write display data into DDRAM, whereas RGB screens do not write data into DDRAM but write directly to the screen, resulting in faster read/write speeds.

Source: | Jishu Community

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