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Advantages of RGB interface | Disadvantages of RGB display interface

This page covers advantages and disadvantages of RGB display interface. It mentions benefits or advantages of RGB interface and drawbacks or disadvantages of RGB interface.

Introduction : There are various common display interfaces viz. LVDS, RGB, MIPI, Vx1 and eDP used for image transfer. We will understand RGB interface basics, its signals, its merits and demerits.

What is RGB display interface ?

Most LCD displays support parallel RGB interface. This interface is used between graphic controller and display module. It uses basic timing signals such as VSYNC, HSYNC, R0 to R7, G0 to G7, B0 to B7 and DCLK. Every line in RGB interface can transmit 1 bit of information which determines intensity of RGB color of particular pixel. The 24 bit RGB variant requires 24 wires for every pixel to be transferred.

RGB display interface

VSYNC (Vertical synchronization signal) : It synchronizes data for columns of pixels on display. It is used to reset new frame.
HSYNC (Horizontal synchronization signal) : It synchronizes data for rows of pixels on display. It is used to reset LCD next line or row.
R0 (LSB) to R7 (MSB) for red data, G0 (LSB) to G7 (MSB) for Green data, B0 to B7 for Blue data : It includes separate line for each bit of information.
DCLK : Clock for Input data
DE : Data enable to confirm data transfer accuracy.

Benefits or advantages of RGB interface

Following are the benefits or advantages of RGB interface:
➨It supports small to medium size displays without controllers. The common sizes supported are 3.5 inch, 4.3 inch and 5 inch.
➨It offers high performance with bandwidth up to 1.2 GB per second.

Drawbacks or disadvantages of RGB interface

Following are the drawbacks or disadvantages of RGB interface:
➨RGB is not differential and hence it is easy to disturb signal with noise.
➨Transfer speed is limited as it is not differential.
➨RGB interface does not support larger screen sizes viz. 10-inch and 12-inch.
➨It supports very low resolution and smaller screen sizes.

Refer advantages and disadvantages of following interface protocols.
UART,   SPI,   I2C,   I2S,   Serial interface,   Parallel interface



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