LED displays are widely used in commercial advertising, sports events, transportation, education systems, railway stations, airports, shopping centers, hospitals, hotels, real estate markets, corporate management, and other public service venues. What are the advantages and disadvantages of LED display?
You can find more information on our web, so please take a look.
1. Traditional display
Before the appearance of LED full-color screens, various display tools were invented one after another, such as Inkjet billboard, animate billboard etc.
Among them, the display devices connected to the computer host can basically be divided into CRT, LCD, PDP, LED, OLED，and 3D etc.
2. Advantages of LED screen
LED screen is a perfect combination of LED display technology and video processing technology, which represents the latest displaying technology. Compared with traditional media, a new generation of integrated media has many significant advantages:
(1) Adjustable High brightness, and large viewing angle
For Indoors application: When we play a projector or TV wall during the day, we need to draw the curtains and endure the darkness and occlusion, otherwise the screen will be blank and the content can hardly be seen. This is mainly due to the low brightness, plus the viewing angle is limited.
The brightness of the LED full-color screen is four or five times that of ordinary projectors.The environment can play content very easily, while keeping the room spacious, bright and airy. In addition, the vertical and horizontal viewing angles of the LED full-color screen are both 140°-160°, which means that the viewing angles of almost all positions. The audience has a good viewing effect, which is also unattainable by other display devices.
(2) Dynamic video, large amount of information, bright colors and realistic displaying effects.
Human eyes are often more sensitive to dynamics, so it is also an outdoor medium, LED screen advertising are easier to attract the attention of the audience, so that customers who place advertisements can get higher returns. The content played by the LED screen is generally stored in the computer hard disk, so the capacity is large and supports long-term video playback; At the same time, because the LED full-color screen can display 16.77 million colors, it can restore the true colors of the video to the greatest extent, which is vivid and shocking.
(3.) The size is not limited, the shape is free to meet the creative needs
Many media are simple to make small, but very difficult to make big, and technical bottlenecks will follow. The LED display is assembled like building blocks, which is simple and convenient, and more importantly, there is no limit to the size. The larger the screen, the more domineering effect. And because the screen is composed of individual boxes, different shapes can be built according to the designer’s creative ideas, and after the construction, the same or different video content can be played as a whole according to the original design. This is also one of the main reasons why LED full-color screens are especially fond of the various Festival, concert, etc innovative stages over the years.
(4.) Long lifespan, strong in usage
The life of the LED is 100,000 hours, which can be continuously lit for 11.4 years; and the LED belongs to the firmware, and its anti-shock and anti-vibration ability is much stronger than other devices.
(5.) High End, can enhance the user’s brand images.
3. Disadvantage of LED screen
1. The main concern for outdoor led screen is Light pollution. Because the screen is too bright, the illumination at night is the same as during the day. Good news is that we can use Light sensor or setting in the operation system to automatically detect changes of the environment brightness, and automatically adjust the brightness of the screen, to try to avoid light pollution. In this way, screen can protect the environment at the same time saving power consumption.
2. Second, the led screen price is higher than traditional advertising way.
3. Compared with the traditional way, led display power consumption is higher.
Advantages of LED display
1. No seams
The unit of the LED display is the unit board, which is distributed with different sizes, different spacing, different number of lamp beads, this lamp bead is packaged by three color chips, and the light is controlled by the chip behind the unit board. If you want to assemble into a large screen, you only need to splice multiple unit boards together, and it has no splicing obstacles, and there is no seamless seam between the boards and boards, and there is no border like the LCD splicing screen, and naturally there is no seam trouble.
2. Waterproof and sunscreen
For more information, please visit Lucky.
The special composition architecture ensures that the LED display can reach the level of waterproof and sunscreen, so we see that some outdoor displays are LED.
3. High brightness and adjustable
The brightness of the LED display can be freely adjusted to meet the display needs of different lights, such as outdoor facing the sun and facing away from the sun, its brightness is completely different, in order to ensure that the screen is clearly visible, it is necessary to adjust its brightness.
Disadvantages of LED display
1. Low resolution
The resolution of the LED display is much lower than the resolution of the LCD splicing screen, even if its minimum spacing product its resolution can not be compared with the LCD splicing screen, so the most direct consequence is that the LED will have a mosaic phenomenon when displaying the image, and the text will be composed of small squares when looking closely, and the picture clarity is worse.
2. Low contrast
Low contrast will lead to the light and dark and level of the picture is not rich enough, so the picture presented is not good, which is not as good as the LCD splicing screen.
3. High after-sales rate
The lamp beads of the LED display will fall off, dead lights and other phenomena, and they are relatively frequent, which increases the after-sales rate and costs.
4. Need auxiliary heat dissipation
If installed outdoors, the temperature of the LED display will sometimes be relatively high, and an air conditioner must be installed in order to achieve rapid heat dissipation, which is equivalent to an additional cost.
The main function of LED display
(1) Maximum brightness
In the industry "standard" discussed at the end of last year, there were no clear characteristic requirements for the important performance of "maximum brightness", which was in line with GB/T1.2-2002. In "Standardization Work Guidelines, Part 2: Methods for Determining the Content of Normative Technical Elements in Standards", "5.4.3 Values determined by suppliers", it is mentioned that "if the diversification of products is allowed, some characteristic values of the product may not be specified (although these characteristics have a significant impact on the performance of the product)".
Because the use environment of LED displays is very different, illuminance (that is, the average person calls ambient brightness) is not the same, so "for most complex products, as long as the standard specifies the corresponding test method, the supplier provides a list of performance data (product information) than the specific performance requirements given in the standard." These are in line with international standards, but this also leads to unrealistic comparisons in competitive bidding, which users do not understand, so that the "maximum brightness" required in many tenders is often much higher than actually needed.
Therefore, it is recommended that in order to guide users to correctly understand the performance index of the "maximum brightness" of the LED display, it is necessary for the industry to give a guide: in some occasions, in the use of different illuminance environments, what value can the brightness of the LED display meet the requirements.
(2) Primary color dominant wavelength error
Changing the primary color main wavelength error index from "primary color wavelength error" to "primary color main wavelength error" can better explain what characteristics this indicator reflects LED display. The dominant wavelength of color is equivalent to the hue of the color observed by the human eye, which is a psychological quantity and an attribute that distinguishes colors from each other. And the performance requirements specified by this industry standard, literally, users are unable to understand that it is an indicator that reflects the color uniformity of the LED display. So, is it to guide the user to understand the term first and then understand the indicator? Or first recognize and understand the LED display from the customer's point of view, and then give the user-understandable performance characteristics? As mentioned earlier, GB/T1.2-2002 (Standardization Work Guidelines Part 2 Methods for Determining the Content of Normative Technical Elements in Standards) one of the principles for product standard development is the "performance principle": "Whenever possible, requirements should be expressed by performance characteristics, not by design and description characteristics, and this method leaves the greatest room for technological development". "Primary color dominant wavelength error" is such a design requirement, if "color uniformity" is used instead, there is no LED that defines what wavelength.
For users, as long as you ensure that the color of the LED display is uniform, without considering what technical means you use to achieve it, leaving as much room for technological development as possible, which is greatly beneficial to the development of the industry.
(3) Duty cycle
As stated above, the "performance principle" "Whenever possible, requirements should be expressed by performance characteristics, rather than by design and description characteristics, an approach that leaves the greatest scope for technological development". We believe that "duty cycle" is purely a design technology requirement and should not be used as a performance indicator of LED display product standards; Everyone knows very well that there are users who care about the drive duty cycle of the display, they care about the effect of the display, not our technical implementation; Why should we create such technical barriers ourselves to limit the technological development of the industry?
(4) Refresh frequency
From the measurement method of the "Standard", it seems to ignore the real concerns of users, and it does not take into account the different driver ICs, driving circuits and methods used by various manufacturers, resulting in difficulties in testing. For example, the full-color screen bidding of Shenzhen Stadium, in the sample test of experts, the test of this indicator has brought many problems. The "refresh rate" frame shows the reciprocal of the time required, and the display is treated as a luminous light source, which is the flickering frequency of the light source. We can use an instrument similar to a "light frequency meter" to directly test the flicker frequency of the light source of the display screen to reflect this indicator. We have done this test, using an oscilloscope to measure the LED drive current waveform of any color to determine the "refresh rate", measuring 200HZ under white field; At the low gray level such as level 3 grayscale, the measured frequency is as high as a dozen KHZ, and measured with PR-650 spectrometer; WHETHER IN WHITE POINT, OR AT GRAYSCALE LEVELS SUCH AS 200, 100, 50, THE FLICKERING FREQUENCY OF THE MEASURED LIGHT SOURCE IS 200HZ.
Contact us to discuss your requirements of led screen solutions. Our experienced sales team can help you identify the options that best suit your needs.