What is the difference between wireless screen projection HDMI interface and VGA interface?
I heard that HDMI interface connection will be higher definition than VGA, but the old TV in my hometown has a VGA interface. Is there any way to make the TV picture higher definition? Do you need any equipment?
In fact, the TV at home can not only be connected to the TV set-top box, but also to mobile phones, computers, PS3 game consoles, projectors, etc., making it possible to create a highly playable home theater at home.
Of course, implementing these requires the use of wired connections. The most widely used traditional wired connection is to use HDMI and VGA interfaces. The connection method is not complicated, but there are always people who say that it cannot achieve the desired effect, which is actually due to many misconceptions.
HDMI and VGA screen projection
The full English name of 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-to-digital conversion before signal transmission, and can achieve higher audio and video transmission quality.
At present, HDMI projection interfaces and cables on the market support up to 4K high-definition format, making them the preferred way 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. Visually speaking, the VGA interface is a D-type interface with a total of 15 empty pins, divided into three rows, each with five pins.
Among them, in addition to 2 NC (Not Connect) signals, 3 display 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 cables. This kind of relationship is easy to understand, and I just want to say that the first person who came up with this naming convention 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 not as good as 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:
Misconception 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 * 480 to 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 shows, provided that your TV’s VGA supports 1920 * 1080P format.
Old TVs with VGA interface can also have high-definition movies and TV shows
Misconception 2: Using a converter on the VGA interface can result in HDMI effects
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.
Misconception 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 signal quality would be attenuated. If some low-quality products were used, there may even be no image, frame drops, snowflakes, or no sound. But as it has developed to this day, it is no longer comparable, and the Bijie Internet screen projector does not have this problem.
Misconception 4: When connecting a computer to a TV, the two have different interfaces and can be connected with a converter
If your laptop and TV have different interfaces, and you want to project the screen in a situation where the door is not right, you must use a “third-party” converter to connect! Supports both HDMI and VGA interfaces.