Video Graphics Array or VGA port is a standard port for video devices like monitors and projectors.
Several wires, ports, and connections are used to connect the display to the video card.
While this technology is still in use today, other interfaces such as DVI and HDMI are fast replacing it.
What is VGA Port?
VGA is the abbreviation for Video Graphics Adapter or Video Graphics Array.
The main characteristics of a VGA are as follows:
- It has a 640 x 480-pixel resolution.
- It has a refresh rate of 60 Hz.
- If you reduce the size to 320 x 200 pixels, then 256 colours will be displayed.
VGA cables have 15-pin connectors with 5 pins on top, 5 pins in the middle, and 5 pins on the bottom.
A desktop or laptop’s VGA port contains the same number of pinholes as a VGA cable can be plugged in directly.
Each pin has a certain role.
For example, the first pin transmits the colour red, whereas the second and third pins, respectively, transmit the colours green and blue.
Male vs Female VGA ports:
Computer cables are divided into two genders: male and female.
The connections on a male cable are bulging or stabbing out of the cable.
Female connections are the absolute opposite of male connections featuring inward holes that allow the male wire to fit in.
This cable connects the monitor to the computer, where it meets a female video card connection.
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How Does it Work?
- The five active video signals can be transferred through the VGA connection owing to the Video Graphics Array ports.
- These signals are carried via the cable as analogue components that could be:
- Horizontal sync encompasses all digital signals used for visual sync.
- Vertical sync is a method of synchronising video signals that includes digital signals.
- The colour is controlled by a red analogue signal with a range of 0 to 0.7 volts.
- Blue analogue signals and green analogue signals with the same range and purpose.
- The three RGB signals (red, green, and blue) are analogue impulses that aid in the creation of all other colours.
- This is accomplished by scanning the electron beam across the viewing screen while a series of horizontal lines assist to generate the image.
- On the other hand, RGB colour information in the video signal helps in adjusting the electron beam’s strong point.
- The screen refresh operation starts in the top left corner at this time.
- This allows you to paint the image a single pixel at a time, beginning at the left and working your way to the right.
- When the first row has been painted, the column address and row additions are reset to fit the first column.
- In this method, you may paint the entire screen.
- When it’s done, the whole refresh process starts again.
- The video signals delivered by the VGA port refresh the entire screen 60 times per second while painting.
- Image flicker is reduced, and motion is produced, which is referred to as the refresh rate.
- Computer monitor refresh rates should ideally be significantly greater than 60 Hz.
- For example, a 640 by 480-pixel mode will take about 40 nanoseconds per pixel.
- This is the time duration of a 25 MHz clock.
- The vertical sync primary emphasises the monitor when it’s important to demonstrate the next frame or image.
- The monitor immediately begins to display it with a 0,0 pixel in the upper left corner of the screen.
- On the other hand, the horizontal sync signal instructs the monitor to start refreshing a new 640-pixel row.
- This operation is repeated until the image is restored to 480 rows of pixels with 480 horizontal sync video signals.
- The monitor will be reset to the upper left-hand corner when the vertical sync signal is detected again.
- This process continues indefinitely.
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Uses of VGA Port:
- The VGA port serves a variety of functions and it was formed primarily for use in the electrical industry.
- Laptops, monitors, televisions, and other devices can be connected via a VGA port.
- The VGA port is also used to connect various electronic devices that send video signals, such as a movie screen, a square screen, an LED display, a spectrometer, and a projector.
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Frequently Asked Questions:
What are VGA ports?
A VGA cable is a video signal transmission device.
What is the difference between HDMI and VGA ports?
VGA is a digital interface, whereas HDMI is an analogue.
Is VGA better than HDMI?
No, HDMI is better.
VGA is easy to use, affordable, and most importantly it’s still functional.
Ideally, whether you choose DVI or GVA, the display will resemble the same.
Section Under: FAQ