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Hello everyone, in this lesson we will introduce the analog display interface

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The analog display interface is an interface that uses analog signals to transmit display screens

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One of the most representative is the VGA interface

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VGA interface can be said to be the most widely used video interface

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But the VGA interface has some disadvantages

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Its resolution is only up to 1080, and the connection line should not be too long

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So the VGA interface is now slowly being phased out

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Let's take a look at the pin definition of the VGA interface

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The VGA interface has a total of 15 pins

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One, two, and three pins are the three primary colors of red, green, and blue.

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Pin 1 is red base color

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Pin 2 is green base color

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Pin 3 is blue base color

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All the colors we can see can be obtained by mixing red, green and blue in different proportions.

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The VGA interface displays the picture through these three colors.

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Going down, we don't need to care about four or five pins

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The following three pins opposite to the three pins of red, green and blue are red ground,

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green ground and blue ground respectively.

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Normally, these three pins are directly grounded

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The ninth pin is the power supply pin

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However, many machines do not use this power supply pin very much.

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The tenth pin is grounded, don't worry about it

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Pin 11 is generally not used

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The last remaining 4 pins are also very important pins

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12 and 15 pins are serial data bus

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The serial data bus is used to read screen information

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And 13, 14 pins are line and field synchronization signals

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If there is no line and field sync signal, the screen will not display

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Although the VGA interface has so many pins,

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the pins that need our attention are actually only the three primary colors of red,

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green and blue, serial bus and line and field synchronization signals.

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Ok, the above is a brief introduction of the analog interface