With the rapid development of the Internet era, display devices, as one of the important ways of network information dissemination, naturally can not help but have LED displays and splicing screens. In addition, displays can be seen everywhere in the corners of major cities. LED display manufacturers have developed many new products to meet the diversified needs of the public for display equipment. So, what is the difference between LED display screen and splicing screen? Do you know how much the outdoor led display is?
The splicing display unit can not only be used as a display alone, but also be spliced into a large screen. According to different use needs, the graphics processor can realize the functions of changing the size of the screen: single screen multi screen display, single screen single screen display, any combination of splicing screens, image splicing, full screen splicing, image frame can be compensated or covered, support roaming, zooming stretching, cross screen display of digital signals, setting and operation of various display plans, and real-time processing of full HD signals. Generally speaking, the splicing screen is DLP projection or LCD splicing screen. But in a sense, LED display is also a splicing screen, because LED display is also a large screen spliced by multiple unit modules or unit boxes. The difference is that LCD LCD splicing screen and DLP projection splicing screen have splicing gaps, while LED display splicing screen has no gaps.
With people's increasingly high requirements for high-definition display and close viewing, P2.5, P3 and P4 full-color led displays are now used more frequently in indoor conventional screens, and their prices have also dropped significantly. In addition, LED display manufacturers have also developed small pitch LED displays with a pitch of less than 2.0, and small pitch LED displays with a pitch of less than 1.0 mm have been mass produced. Its definition, refresh rate, gray scale, color reproduction and close viewing have been greatly improved.
Taking P2.5 full-color LED indoor display as an example, P2.5 refers to the point spacing, that is, what the number behind P is, and what the point spacing is. The point spacing of P2.5 is 2.5mm, which refers to the spacing between two pixels or two lamp beads. The center distance between two lamps of P2.5 is 2.5mm. The image is not distorted when viewed at 2.5 meters, that is, there are no light beads. Of course, the smaller the dot spacing, the higher the image definition, the more difficult the production process, and the higher the price.
For the splicing screen, its resolution is high. Each unit can display images independently. On one unit picture, other pictures can be displayed. Multiple pictures can be dragged at will, or other pictures can be superimposed on one picture. You can also play a whole image in multiple units, zoom in, zoom out, stretch at will, change the playing position, etc. The combination mode is quite random. Moreover, due to the high resolution, it can be viewed from a close distance, but the inherent splicing gap between LCD and DLP splicing screens will affect the overall image aesthetics. However, in addition to the above functions, LED display can also achieve seamless splicing, so it has advantages in large screen splicing display.
In addition, in terms of other aspects, such as brightness, the brightness of LCD splicing screen and LED splicing screen can meet the requirements of viewers. At present, small pitch LED displays developed by LED display manufacturers also tend to have low brightness, that is, the brightness is lower than 800cd. The brightness of LCD splicing screen is more suitable for close viewing.
For display effect, the core indicator of display equipment is display effect, and different display technologies will have certain differences in display effect. LCD splicing screen can basically meet people's pursuit of display effect, but when playing a darker picture, the contrast between light and dark details cannot be clearly displayed. The gray level of conventional LED display is 14bit. In order to further provide the contrast of LED display, the gray level of small pitch LED display developed by LED display manufacturers can reach 16bit. Even if you play a darker image, you can still see the contrast of light and dark details clearly.
In terms of contrast, the contrast of LED display can reach 3000:1, or even 5000:1, while the contrast of small pitch LED display is higher. However, in terms of requirements, the contrast of LCD and LED display technologies exceeds the actual display requirements and the resolution limit of the human eye. Therefore, in terms of contrast, the picture quality of the two display technologies depends more on the optimization of software than on the limit value of hardware.
This is the led arc screen from a bar in Berlin, Germany. It not only sets off the atmosphere, but also allows the surrounding guests to see the contents of the screen.
The following are the main differences between LED display screen and splicing screen
Point defect refers to the probability of bad spots, faulty soldering, bright spots, dark spots and color traces on the display equipment. In this regard, because the LCD splicing screen is illuminated by the surface, point defects rarely occur. The LED display screen is illuminated by dots, so the unit lamp beads are prone to spot defects. Especially for small pitch LED displays, the probability of point defects is higher.
As LED display is packaged by thousands of lamp beads, its resolution also refers to the number of lamp beads on the display. For example, the resolution of P2.5 full-color LED indoor display screen is 160000 points/m2, and that of P1.0 small pitch LED display screen is 1000000 points/m2. The 2K resolution is 1920 * 1080=2073600, that is, if P2.5 LED indoor displays are point-to-point spliced into 2K resolution, a screen of more than one square meter is required, while P1.0 small pitch LED displays do not need to be up to one square meter. However, the 55 inch LCD screen can achieve 2K resolution, which means that the resolution of the LCD screen is higher than that of the LED screen under the same size. In order to improve the resolution of LED display, LED display manufacturers can also achieve higher resolution and clearer picture display effect with the help of video processors.
The refresh rate is a key indicator to effectively suppress the flicker of screen images. The refresh rate of LED display can reach 1920Hz, and the refresh rate of small spacing LED display can reach 3840Hz, or even higher. The refresh rate of LCD screen is generally only 60-720Hz, and its resolution is lower than that of LED screen. However, these resolutions can meet the requirements of human eyes. The difference is that the higher the resolution is, the stronger the flicker of the image will be.
It refers to the actual viewing experience of the color range on the contrast index, representing the ability of the display screen to restore color. There is no specific method to quantify this indicator, but in general, the color resolution and contrast of small pitch LED displays are obviously higher than LCD screens. This is one of the main reasons why small pitch LED displays can quickly seize the display market of security, monitoring, public security and dispatching command center.
In addition to the high requirements for application scenarios such as radio and television, other splicing wall display customers do not have high requirements, and general display products can meet their requirements. In terms of color range, small pitch LED display is a natural wide color gamut product, with 256 * 256 * 256=16777216 colors. LCD splicing screen depends on which light source is used, but no matter what light source is used, its color range is not as rich as LED display screen.
Engineering heat dissipation
Since the power of LCD splicing screen is small, it is rarely necessary to use cooling equipment such as air conditioner. Although LED display screen is packaged with very low power LED lamp beads, each screen is packaged with thousands of lamp beads, so its power is relatively high. Therefore, it is necessary to use air conditioners and other equipment for heat dissipation. Heat dissipation is a key indicator of long-term stable operation of large size display system.
Consumables and display core life indicators
It mainly refers to the lamp beads and backplane of LED display screen, LCD screen body and light source. The service life of the LCD screen depends on the materials and processes used. Generally, the service life of the LCD screen is about 3-5 years, while the good one can be used for about 100000 hours. The service life of LED display screen is generally about 100000 hours.
As far as the cell thickness is concerned, the thickness of LCD splicing screen is relatively thin, and it is constantly optimized. While the small pitch LED display screen can realize the front maintenance and installation, and its thickness is also decreasing, in general, its thickness is still thicker than the LCD splicing screen.
So Sostron briefly introduced the difference between LED display and splicing screen. In a sense, LED display and LCD display are both splicing screens, but they are different. The former has no splicing gap, while the latter has splicing gap. They have their own advantages and differences in contrast, brightness, resolution, color range, refresh rate and life indicators. Relatively speaking, on the basis of closer resolution and balance of display effect, the comprehensive cost of using LCD to splice large screens will be lower, but detailed comparison is required. Because the price of LED with different point spacing is quite different, if we want to build a large screen system, we should first determine which panel, size, splicing LCD to splice large screens, and how many point spacing LEDs to use, In this way, we can determine which is more cost-effective.