What is HDMI port? How to use, compare HDMI port and VGA

HDMI port is a common connection port, typically used to transmit audio and video between electronic devices without compromising the quality of the audio and images. So, what exactly is the HDMI port? Let's explore the concept, usage, and differences between HDMI and VGA through the following article on Mytour Blog.

1. What is HDMI port?

HDMI stands for High-Definition Multimedia Interface. Users can consider the HDMI port as a versatile interface or connectivity standard. This port was invented with the purpose of transmitting high-quality images and sound between electronic devices through a single cable. Of course, the transmitted audio and images maintain their high resolution. For example, you can use the HDMI port to transmit content for a PowerPoint presentation from your laptop to a projector screen, or to transmit audio from your phone to a speaker using only the HDMI port,...

Currently, the most common and popular versions of the HDMI port are HDMI 1.4, HDMI 2.0, and HDMI 2.1.

Buy high-quality, affordable HDMI port converters and splitters at Mytour:

2. Structure and operating principle of HDMI

• Structure:

HDMI is essentially a cable, with the head consisting of 19 pins. Each pin is responsible for different tasks and operates according to a specific principle during the data transmission process.

A common point about HDMI ports that users need to know is that the sound quality when transmitted through HDMI ports is supported according to studio-quality audio standards. Therefore, users can completely trust HDMI to transmit data between devices.

• Operating Principle:

As mentioned earlier, HDMI has a structure consisting of 19 pins, each with specific tasks including:

• Pins 1 to 9: All 9 pins are evenly divided into 3 TMDS data channels. Each channel has its own polarity, a signal shield, or a cool ground. The main function of these pins is to convert audio and image information data with minimal error. 
• Pins 10 to 12: These pins help synchronize signals. The main function of these 3 pins is to transmit data to the TMDS Clock channel.
• Pin 13: This pin is responsible for sending commands and controlling data connected to other devices. Additionally, pin 13 helps control CES power consumption.
• Pin 14: This pin stores situations that you may use in the future.
• Pins 15 and 16: Both pins are dedicated DDC pins and act as intermediaries for devices. Furthermore, both pins 15 and 16 are used for EDIC communication information and display data functions. 
• Pin 17: This pin is used for 2 DDC and CEC channels, acting as a barrier.
• Pin 18: This pin carries +5V power.
• Pin 19: This is considered a hot pin with protective functions, monitoring plug/unplug activities and current fluctuations.

3. Types of HDMI ports

HDMI ports are divided into 2 types based on connection speed and compatibility with devices:

Based on connection speed

Based on connection speed, HDMI ports are divided into 5 main types:

Based on compatibility with devices

Based on compatibility with devices, HDMI ports are divided into the following 4 main types:

4. Devices supporting connection with HDMI port

Currently, smart devices are becoming increasingly advanced, with each device having a dedicated HDMI port, such as:

• Mini HDMI port used for graphics cards, tablets, DSLR cameras.
• Micro HDMI port used for tablets, LG phones, Sony Experia A,R,C phones.
• HDMI MHL port used for all smart phone models, responsible for connecting the phone to a projector via HDMI port.

5. Advantages and disadvantages of HDMI port

Before understanding more about usage, you need to grasp the advantages and disadvantages of the HDMI port for a detailed evaluation.

Advantages

• The transmission speed of HDMI port is 60 frames per second and the transmitted data has full HD resolution.
• Extremely convenient because you only need to transmit audio, video, data, images through one cable.
• When using HDMI port to transmit audio and video while watching movies or listening to music, you will be completely satisfied with studio-quality sound and clear, sharp images.
• The cable size is small, avoiding inconvenience when carrying it around. The cable design is aesthetically pleasing.
• Creates simple, easy connection between HDMI port and electronic devices. This is also a good support device for learning and entertainment. 

Disadvantages

• Compared to VGA port, the cost of HDMI port is somewhat higher.
• Because the cable does not have a locking mechanism, frequent use may loosen the socket, causing unstable transmission.
• In some schools or offices, VGA ports are still in use, so in reality HDMI ports are not yet widely used in these places.

6. How to connect a laptop to a TV using HDMI port

Before performing the steps to connect a laptop to a TV via HDMI port, users need to make sure that both the laptop and TV support HDMI port. After completing this check, follow the 4 steps below:

• Step 1: Users need to adjust the distance between the TV and laptop to match the length of the cable. Then, connect one end of the HDMI port to the laptop, and the other end to the TV.

• Step 2: When accessing the settings on the TV, the HDMI command tab will appear under the Input section. Now, use the remote control to select the HDMI command tab. 

• Step 3: After selection, the laptop and TV will automatically connect to each other. However, in some cases where the laptop does not send signals, you need to press the Windows + P key combination, then select “Duplicate” to proceed with the connection.

• Step 4: When the signal between the two devices is successfully emitted, it means you have completed the connection steps between the laptop and TV. You can verify by selecting a movie to watch to see the transmission of images and sound through the HDMI port from the computer screen to the TV.

Learn more: 5+ Simple ways to connect a computer to a TV at home

7. How to connect a phone to a TV using HDMI port

The method of connecting a phone to a TV via HDMI port is somewhat simpler with just 3 steps:

• Step 1: Prepare the HDMI or HDMI MHL port.

• Step 2: The HDMI MHL port has 3 plugs, so you need to plug the smallest connector into the phone, the HDMI MHL end into the HDMI port on the TV, and the remaining plug into the USB port.

• Step 3: Use the remote control to select the power button on the TV. In the Inputs List section, you will find the HDMI command tab and wait a few seconds for the TV to detect the connection signal. This way, you have successfully connected the phone to the TV via the HDMI port.

Learn more: Simple and quick ways to connect your phone to TV

 8. Comparison between HDMI and VGA ports

9. Frequently asked questions about HDMI port

This article helps you answer the question 'what is HDMI port?', and provides useful information about the advantages/disadvantages, classification, and usage of HDMI ports. To purchase high-quality, genuine HDMI ports at affordable prices, visit Mytour for a shopping experience.