In the field of commercial displays, lcd screens and small spacing leds are two mainstream screen programmes. There are significant differences in the quality, structure, installation maintenance, etc., due to different luminescent principles. The following is a comparison of the four dimensions and a selection proposal。
I. Brightness and contrast
The lcd screen is a back-ray image, the panel itself does not glow, and the image is shown using back-light sources to penetrate the lcd layer. Due to the fact that the light could not be completely shielded, there was a slight leakage when black was shown and black actually appeared to be dark gray. The conventional model contrasts 1000:1 to 3000:1 and the brightness ranges from 500 to 700 cd/m2. In a soft-lighted indoor environment, the picture is all the same, but in a strong light environment it is easy to read and the details are lost。
The small distance led uses the principle of spontaneous pixel light, and each bead independently controls the light. The black time beads are shown to be completely closed to achieve true pure black effects, the contrasts are theoretically infinite, the real ansi contrasts are generally over 5000:1 and the dark details are rich. The conventional indoor brightness ranges from 800 to 1200 cd/m2 and the picture remains bright and clear in the light environment。
Note that when the led screen is shown at a low brightness, the dark screen is prone to colour bias or loss of detail; the lcd screen transitions more smoothly at a low brightness。
Ii. Physic collages
Each screen of the lcd screen has a fixed border and there is a physical hard-on collage after the collage. The main spellings are 3. 5 mm, 1. 7 mm and 0. 88 mm, and even the narrowest models are followed by black lines. When a map, picture or video is displayed on full screen, the image is divided and the integrity is affected。
The small distance leds use a sutureless fusion of modulus, with no border between the modulus, to achieve a zero-strength suture. The whole screen is complete and coherent, without any sense of partition, and suitable for places that require a higher degree of visual integrity。
Iii. Product form and clarity
The lcd screen is dominated by a standard-size rectangular flat screen, with common specifications of 46, 49 and 55 inches, and can only be integrated and cannot be shaped in arc, corner or alien. Single-screen resolution can reach 1080 p or even 4 k, with high pixel density. When viewing a distance of less than 2. 5 m, the exact content of text, tables, surveillance images, etc. Is clear and sharp。
Small spacing leds are divided into p1. 2, p1. 5, p1. 8, p2. 0, etc., and the smaller the value is finer. Design is free to support customisation of plane, arc, corner and alien. However, the pixel density in the same area is lower than the lcd, and the sense of viewing particles at close range is clear. When viewing a distance of more than 3 metres, the sense of particles is no longer visible and the seamless advantage is realized。
Iv. Installation and transport
Following the introduction of the lcd screen, it is necessary to set aside 60 to 80 centimetres of overhaul corridors behind the wall, suitable for room scenarios with installed space. Technically mature, with low failure rates, single-screen failure is sufficient. It consumes about 200 to 300 w/m2, with low heat, stable long-term operations and low transport costs。
The two methods of maintenance and post-maintenance before small distance led support can be installed with a wall and no space left behind. However, the construction process is demanding at a cost of approximately 500 to 800 w/m2, with a high heating volume, and a large area of screens requiring additional air-conditioned dispersion. The light beads, which may become dead or suffer from uneven brightness after several years of use, will need to be corrected periodically, with later maintenance frequency and cost higher than lcd。
Selection recommendations
Select by view distance: the view distance is less than 3 m and requires frequent viewing of the exact contents of text, tables, monitoring, etc., giving preference to the lcd screen; the seamless advantage of led is more pronounced when the view distance is more than 3 m。
Depending on the use of the environment selection: 7 x 24-hour start-up, limited budget, stabilization and low-maintenance scenarios, such as the control room, movement control centre, more pragmatic lcd screens, hotel halls, brand halls, press conferences, etc., with image displays at their core and adequate budget, with a greater visual impact of leds at small intervals。
On the basis of a space-to-budget trade-off: a small area of up to 10 square metres at higher lcd prices; a large area of more than 20 square metres at a lower and more economical cost per unit of led space。
In general, the lcd screens are designed to be stable and durable, with clear eye protection and a long sense of luck; small spacing leds win with seamless shock, brightness and flexibility. There are no absolute advantages or disadvantages, but the key is to make the right choices based on physical viewing distance, environmental conditions and budget。
Finally
Tianjin light planet science and technology development ltd., a local led industry in tianjin for more than 30 years, is a well-established, well-qualified and technologically highly skilled firm. The company operated in the production of led monitors, led lighting products, led screen maintenance, etc. At the same time, there are a number of architectural qualifications to carry out various engineering projects for building intelligence and mechanical and electrical installation. Specialized in tianjin locality: led screen maintenance, annual protection, screen upgrade, site failure screening, etc。
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