Small LED spacing and how far you <br> <br> So in the end a small pitch LED display is how to define it? We all know that LED display is made up of LED lamp beads. The distance between LED display screens refers to the distance between the center points of two LED lamp beads. The LED display industry generally adopts the method of defining product specifications according to the size of this distance. For example, our common P12, P10, P8 (point spacing is 12mm, 10mm and 8mm respectively), etc., and as the process progresses, the dot pitch is getting smaller and smaller. According to the industry consensus, LED displays with a dot pitch of less than 3 mm are small-pitch LED displays. It is understood that in the current mass production LED display, the minimum point spacing is P1.6, that is, the distance between the center points of the two lamp beads is only 1.6mm.
Everyone has seen LED display products in their daily life. Whether it is a roadside tobacco and tea shop, or a major hotel building, or a party performance stage, the usage rate of LED display is still quite high, but those products are mostly used. Traditional large-pitch LED display products, with the maturity of small-pitch technology, LED display manufacturers began to look to the broader indoor application market, you have thought about LCD TVs, projectors, in the living room, conferences Is there a small pitch LED display in the room?
Three troubled LED burglary <br> <br> we've introduced the small pitch LED display with some of the existing mainstream consumer display devices do not have the advantages such as high color gamut, high refresh rate, low power consumption, etc., The small-pitch products also have some customer service problems, which affects it to become the first choice for home users or offices.
The first is the price. Due to the need to install more LED lamp beads per unit area, the small-pitch LED display has higher requirements on the process, and the heat dissipation, circuit and other issues have to be solved to cost more than the large-pitch products. The low rate makes the current price of small-pitch LED products still high. For ordinary users, products with more than 100 inches cost hundreds of thousands of dollars to purchase, which is quite difficult. On the other hand, with the increase in the production capacity of small-pitch LED displays and the advancement of technology, the yield will be further improved and the price of products will continue to fall.
Secondly, it is a space problem. Even for products with small pitches such as P1.6, to achieve full HD resolution (1920×1080), the screen size will reach 144 inches. This is a huge demand for space, not including the base. The length and width specifications are about 3.2 meters x 1.8 meters. It is not easy to find a wall that can put it down. It is not necessary to consider the complicated installation work of this big guy.
Secondly, it is a space problem. Even for products with small pitches such as P1.6, to achieve full HD resolution (1920×1080), the screen size will reach 144 inches. This is a huge demand for space, not including the base. The length and width specifications are about 3.2 meters x 1.8 meters. It is not easy to find a wall that can put it down. It is not necessary to consider the complicated installation work of this big guy.
Another important issue is maintenance. Although the life of LED lamp beads can reach 100,000 hours, due to the extremely high density and the required thickness of the incoming products, it is difficult to dissipate heat and is prone to local failure. It is not a simple matter to maintain and overhaul such a behemoth.
The above points are the main reason why small-pitch LED display products are still difficult to enter into ordinary people's homes. Of course, LED display manufacturers are actively responding to these problems. Aside from these problems, the small-pitch LED display is absolutely no problem in the visual experience. Since there is no display technology of backlight transmission, it is directly illuminated by the lamp bead, so the response time, color capability, brightness, etc. of the LED display. Indicators have an advantage over LCD products.
If you look at it now, small-pitch LED display products can only be used in luxury villas, high-end conference rooms, etc., and ordinary consumers do not have the ability to consume it, but in the future, small-pitch LED display products will replace projectors. The main conference room, which replaces the LCD TV into the main living room, is worth looking forward to.
What is Car Ethernet
Car Ethernet is a new local area network technology that uses Ethernet to connect the electronic unit in the car. Unlike traditional Ethernet, which uses 4 unshielded twisted pair cables, car Ethernet can achieve a transmission rate of 100Mbit/s or even 1Gbit/s on a single pair of unshielded twisted pair cables. At the same time, it also meets the requirements of the automotive industry for high reliability, low electromagnetic radiation, low power consumption, bandwidth allocation, low latency and synchronous real-time. The physical layer of on-board Ethernet uses BroadRReach technology, and BroadR-Reach's physical layer (PHY) technology has been standardized by the One-pair Ethernet Alliance (OPEN). Therefore, it is sometimes called Broad RReach (BRR) or OABR (Open Alliance BroadR-Reach). The MAC layer of vehicle Ethernet adopts the IEEE 802.3 interface standard and seamlessly supports widely used high-level network protocols (such as TCP/IP) without any adaptation.
On-board Ethernet protocol architecture
Vehicle-borne Ethernet and its supported upper-layer protocol architecture are shown in Figure 1. Vehicle-borne Ethernet mainly involves OSI layer 1 and Layer 2 technologies, while vehicle-borne Ethernet also supports AVB, TCP/IP, DOIP, SOME/IP and other protocols or application forms.
On-board Ethernet framework
Among them, AVB is an extension of traditional Ethernet functions, which enhances the real-time performance of traditional Ethernet audio and video transmission by adding precise clock synchronization, bandwidth reservation and other protocols, and is a network audio and video real-time transmission technology with great development potential. SOME/IP (Scalable Service-Oriented MiddlewarE on IP) specifies the video communication interface requirements for vehicle camera applications, which can be applied to the field of vehicle cameras, and realizes the mode control of driver assistance cameras through apis.
As an extension of AVB protocol, Time-Sensitive Networking (TSN) introduces related technologies of time-triggered Ethernet, which can efficiently realize the transmission of automotive control information. In addition, the on-board Ethernet of the 1Gbit communication standard also supports Power Over Ethernet (POE) function and Energy-Efficient Ethernet (EEE) function. The POE function provides power for connected terminal devices while transmitting data through twisted pair cables, eliminating the need to connect external power cables to terminals and reducing the complexity of power supply.
On-board Ethernet standardization
In terms of in-vehicle Ethernet standardization, the IEEE802.3 and IEEE802.1 working groups, AUTOSAR, the OPEN Alliance and the AVnu Alliance have played a major role in promoting it.
The IEEE802.3 local area network standard represents the mainstream Ethernet standard in the industry, and the on-board Ethernet technology is developed on the basis of IEEE802.3, so the IEEE is currently the most important international standardization body for on-board Ethernet. In order to meet the requirements of the car, it involves the development of a number of new specifications and the revision of the original specifications within the two working groups of IEEE802 and 802.1, including PHY specifications, AVB specifications, and single-wire to data line power supply. In addition, AVB related to AV transmission, timing synchronization and other specifications also need to be standardized by other technical committees of IEEE, such as IEEE1722 and IEEE1588.
OPEN Alliance
The OPEN Industry Alliance was launched in November 2011 by Broadcom, NXP, and BMW to promote the application of Ethernet-based technology standards to in-car connectivity. The main standardization goal is to develop a 100Mbit/s BroadR-R physical layer standard and develop OPEN interoperability requirements.
AUTOSAR
AUTOSAR is a consortium of automotive manufacturers, suppliers, and tool developers that aims to develop an open, standardized automotive software architecture, and the AUTOSAR specification already includes the automotive TCP/UDP/IP protocol stack.
AVnu
The AVnu Alliance was formed by Broadcom in collaboration with Cisco, Harman and Intel to promote the IEEE 802.1 AVB standard and the Time Synchronization Network (TSN) standard, establish a certification system, and address important technical and performance issues such as precise timing, real-time synchronization, bandwidth reservation, and traffic shaping.
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