What does HDMI cable 19+1 mean? In fact, HDMI 19+1 refers to the HDMI2.0 version cable composed of 20 cores, corresponding to the 19+1 pin HDMI interface. The more commonly used old version of this version is the HDMI1.4 version of the 14+1 specification, which is composed of 15 cores and can also be compatible and matched by the 19+1 pin HDMI interface.
HDMI1.4 version is an earlier version than version 2.0. Its transmission bandwidth is 10.2Gbps, which can reach a picture refresh rate of 24Hz, but it cannot support 4K picture transmission. When transmitting 4K signals, the video will not be smooth, and the video will be stuck, blurred or black. Wait for the situation. In terms of color saturation, the 1.4 version of the HDMI cable only supports 8bit color depth.
Types of HDMI Cables
Standard HDMI Cable: Supports up to 720p or 1080i resolution.
High-Speed HDMI Cable: Supports 1080p resolution and beyond, including 4K, 3D, and deep color.
Premium High-Speed HDMI Cable: Supports 4K video with additional features such as HDR.
Ultra High-Speed HDMI Cable: Supports 8K video, higher refresh rates (e.g., 120Hz), and advanced features like Dynamic HDR and eARC (Enhanced Audio Return Channel).
HDMI Versions
HDMI cables come in various versions, each adding new features and capabilities:
HDMI 1.4: Introduced support for 3D, 4K at 30Hz, and Ethernet over HDMI.
HDMI 2.0: Enhanced 4K support up to 60Hz, increased bandwidth to 18 Gbps, and support for 32 audio channels.
HDMI 2.1: Supports 8K resolution at 60Hz, 4K at 120Hz, Dynamic HDR, eARC, and a maximum bandwidth of 48 Gbps.
Connector Types
Type A (Standard): The most common type, used for TVs, monitors, and AV receivers.
Type C (Mini): Smaller version used for portable devices.
Type D (Micro): Even smaller version for compact devices like smartphones and tablets.
To put it simply, 19+1 is the structure of HDMI 2.0. HDMI can be divided into three types: HDMI Type-A, Type-C, and Type-D according to different connected devices. The three types have 19Pin versions, but the three types of 19 +1 HDMI cables have different pin definitions.
There are a total of 19 pins in HDMI Type A, the specification is 4.45 mm×13.9 mm, which is the most common HDMI connector specification; HDMI Type B, commonly known as mini-HDMI, is used in HDMI1.3 version, there are 19pins in total, which can be said to be a reduced version of HDMI Type A, the specification is 2.42 mm×10.42 mm, but the pin definition has changed; HDMI Type C is used in HDMI1.4 version, there are a total of 19 pins, the specification is 2.8 mm×6.4 mm, but the pin definition has changed. The new Micro HDMI interface will be about 50% smaller than the current 19-pin MINI HDMI interface, which can bring the highest resolution support of 1080p and the fastest transmission speed of 5GB for portable devices such as cameras and mobile phones.
What is the purpose of each pin in HDMI cable 19+1?
The function of TMDS is to send audio, video and all kinds of auxiliary data information. The two groups are a pair with 3 TMDS channels in common; DDC is called Display Data Channel in full, and the sender and receiver can use each other's sending and receiving capabilities. However, HDMI only needs to know the ability of the receiving end display in one direction, and uses an I²C signal with a clock frequency of 100kHz;
The full name of CEC in English is Consumer Electronics Control. It is reserved for wiring and does not need to implement any functions. It is generally used to send industrial-standard AV Link protocol signals to support a single remote control to operate multiple AV machines; TMDS Clock: synchronous clock signal
Reserved is a reserved pin; the full name of SCL is SerialClock, which is the clock pin when the source (DVD) and display (TV) communicate; SDA is SerialData, the principle is the same as SCL, the data pin; DDC/CEC Ground is responsible for grounding; +5V Power is a positive 5V power supply; Hot Plug Detect is used for hot plug detection.
