Projection – The difference between HDMI projection and VGA projection
The most widely used traditional wired connection is the use of HDMI and VGA interfaces. The connection method is not complex, but there are always people who say it cannot achieve the desired effect. In fact, there are many misconceptions.
HDMI projection and VGA projection
The full English name for HDMI is “High Definition Multimedia”, which means high-definition multimedia interface in Chinese.
It can achieve both high-definition image quality and audio output, without the need for digital/analog or analog/digital conversion before signal transmission, and can achieve higher audio and video transmission quality.
At present, the HDMI projection interface and cable on the market support up to 4K high-definition format, making it the preferred method of connection.
The VGA screen projection interface is the interface for outputting analog signals on the graphics card, also known as the D-Sub interface, which is actually the interface for transferring the display. In terms of appearance, the VGA interface is a D-type interface with a total of 15 empty pins, divided into three rows of five in each row.
Among them, in addition to 2 NC (Not Connect) signals,3display data buses, and 5 GND signals, the most important ones are 3 RGB color component signals and 2 scanning synchronization signals HSYNC and VSYNC pins.
Both HDMI and VGA interfaces are male and female, with female connectors (recessed) on computers and televisions, and male connectors (protruding) on wires. This relationship of attack and suffering is easy to understand, and I just want to say that the first person who came up with this naming method is really talented.
What is the difference between HDMI interface and VGA interface?
The biggest difference between the two is twofold:
1. When using HDMI transmission, only one data cable is needed to complete the data transmission of video and audio, while when using VGA transmission, the audio of the laptop needs to be connected to the audio system, just like plugging in headphones.
2. Even though VGA interfaces already support 1920 * 1080P resolution, they are still inferior to HDMI in terms of image transmission quality and refresh rate, so HDMI interfaces have much better support for high-definition videos than VGA interfaces.
To make television have high-definition film and television, these misconceptions need to be corrected:
Myth 1: HDMI is high-definition, VGA is not
High definition refers to a resolution with extremely high clarity, commonly used in the television industry, including formats such as 1280 * 720i, 1280 * 720P, 1920 * 1080i, 1920 * 1080P, etc.
VGA supports various resolutions ranging from 640*480to up to 2560*1600. Currently, HDMI supports up to 4K, and VGA also supports high-definition. The command centers of major projects and institutions (such as military police and television stations) generally use VGA technology to transmit ultra high definition large screen images.
So your old TV with VGA interface can also have high-definition movies and TV, provided that your TV’s VGA supports 1920 * 1080P format.
Old TVs with VGA interface can also have high-definition movies and TV shows.
Myth 2: Using a converter on a VGA interface can result in HDMI performance
If your VGA device does not support high-definition format, or if you want to present HDMI connection effects and rely on the converter, it is useless. In fact, the converter can be said to only solve the interface adaptation problem.
Myth 3: If the HDMI/VGA cable exceeds 10 meters, the effect will deteriorate
In the past, when HDMI/VGA cables were over 10 meters long, the effect was indeed greatly reduced because the length of the HDMI cable was related to the maximum data transmission rate. The longer the distance, the more the signal quality was attenuated. If some inferior products were used, there might even be no images, frame drops, snowflakes, or no sound. But the development to this day is no longer comparable, and there is no such problem with the Bijie Internet screen projector.
Myth 4: When a computer is connected to a TV, the two interfaces are different and can be connected with a converter
If the interface between your laptop and TV is different, and you want to use a “third-party” converter to access the screen due to the “wrong door” situation! Supports both HDMI and VGA interfaces.