What is the difference between LED display and LED backlight? If the LED backlight display is the star of the merchants to create, then many manufacturers have secretly changed a concept when promoting their own products, obviously the LED backlight display is referred to as the LED display. In fact, what is the essential difference between LED display and LED backlight display?
What is an LED display?
LED display screen refers to the display directly with LED (light emitting diode) as a pixel light emitting element, the light emitting diode that constitutes the array directly emits red, green and blue light, and then forms a color picture. However, due to the large diameter of the light-emitting diode itself, the distance between the same color pixels is also large (that is, the point distance we often say), so the LED display is usually only suitable for large-screen display. At present, LED display has been widely used in large squares, commercial advertising, stadiums, information dissemination, news releases, securities transactions, etc., can meet the needs of different environments.
LED display
The LED display can display changing digital, text, and graphic images. The reason why LED has been widely valued and developed rapidly is inseparable from its own advantages. It can be used not only in indoor environments but also in outdoor environments, with projectors, video walls, LCD screens incomparable advantages. And LED display set microelectronics technology, computer technology, and information processing in one, with its bright color, wide dynamic range, high brightness, long life, stable and reliable work, and other advantages, become the most advantageous public display media. The development prospect of LED is extremely broad, and it is currently developing in the direction of higher brightness, higher weather resistance, higher luminous density, higher luminous uniformity, reliability, and panchromatic colorization.
Advantages of LED display:
High luminous brightness. When sunlight hits the screen surface at a viewing distance, the display content is clearly visible. Super grayscale control. With 1024-4096 levels of grayscale control, the display color is more than 16.7M, the color is clear and realistic, and the three-dimensional sense is strong. Static scanning technology. Static latching scanning mode, high-power drive, fully ensure the luminous brightness. Automatic brightness adjustment. With an automatic brightness adjustment function, the best playback effect can be obtained in different brightness environments. Adopt imported large-scale integrated circuits in an all-around way. Reliability is greatly improved and easy to debug and maintain. Work 24/7. Fully adapted to outdoor harsh environments anti-corrosion, waterproof, moisture-proof, lightning, seismic overall performance, high-cost performance, good display performance, pixel barrel can use P10mm, P16mm, and other specifications. Advanced digital video processing. Technical distributed scanning, modular design, constant current static drive, automatic brightness adjustment. Super high-brightness pure color pixels. The advantages of clear image picture, no jitter and ghosting, and no distortion can be summarized as: long life, small power consumption, miniaturization, shock resistance, high brightness, low operating voltage and stable performance.
What is an LED backlight?
We know that the liquid crystal material itself does not emit light, and we need the light-emitting source on the back of the LCD panel to provide light support. This kind of luminous source has been based on CCFL cold light tubes in the past, and the luminous principle of CCFL cold light tubes is similar to the fluorescent tubes we use every day. However, CCFL cold light tubes also face problems such as uneven brightness, relatively high power consumption and mercury elements. In contrast, LED backlight is better in terms of power consumption and material environmental protection, and the brightness uniformity is relatively high and the volume can be made thinner. Therefore, the prospect of LED backlights is very optimistic for manufacturers. Let’s review the basic principles of liquid crystal displays.
Basic structure diagram of the LCD display
To put it simply, the LED backlight is to replace the traditional CCFL backlight with an LED (light emitting diode, generally white light). There are two types: dot matrix (also known as straight down type) and side light type. Among them, the dot matrix type is mainly used for high-end models of various brands due to uniform brightness, high contrast, natural color, high resolution and long life; Although the brightness of the side light type is a little uneven (if you don’t look closely, you may not see it), but the cost is low, mainly used in the low-end models of various brands.
The transition of the backlight module from CCFL to LED can bring many benefits, which can make the brightness of the display screen more uniform, the product power consumption is lower, and the shape can be lighter and thinner and more stylish. However, the current market is generally used in the W-LED (white LED) backlight, in fact, this backlight is only the light emitting components are replaced, and the improvement of the display effect is very weak or even no improvement. The RGB-LED (three-color LED) that improve the display effect of LCD products is more obvious, but at the same time, the production cost is higher, so it is used in high-priced LCD TVs.
Advantages of LED back-lighting
- LED backlight compared with CCFL: CCFL cold cathode tube is a polluted part in the liquid crystal display, and it is also one of the key components that affect color saturation. LED due to the use of a single point of light resulting in low power consumption, coupled with long life, short light hail environmental protection and other advantages, so the current LED has gradually replaced CCFL a large number of small and medium-sized panels, back-lights, the future will gradually move towards LCD displays, notebook computers, LCD TVs and other large-size panel backlight field. In addition, because the color saturation of LEDs can reach nearly 100%, it is far better than the performance level of 70% to 85% of CCFL.
- LED backlight compared with LCD: Compared with LCD LCD, LED backlight liquid crystal has more advantages in terms of volume, brightness, power consumption, material, viewing angle and refresh rate. The power consumption ratio of LED backlight and LCD is about 10:1, and the higher refresh rate makes the LED backlight have better performance in video, can provide a wide viewing angle of up to 160°, can display a variety of text, digital, color images and animation information, can also play TV, video, VCD, DVD and other color video signals, a number of displays can also be networked. The reaction speed of individual elements of organic LED display is 1000 times that of LCD LCD screen, which can also be taken care of in strong light, and adapts to low temperatures of minus 40 degrees. Using LED technology, it is possible to manufacture a thinner, brighter and clearer display than LCD, which has a wide range of application prospects.
In general, LED displays and LED backlit displays are two completely different imaging technologies. Now those square large screens use LED panels, which directly emit different colors of light by LEDs, but you also see that the pixel and dot spacing is larger, and the current technology cannot be small, so it is only used for large screens, but that long life, energy consumption bottom, color saturation, real, is the future development trend. The LED backlight display is to replace the CCFL (cold light source similar to fluorescent lamps) behind the original LCD with LED, which does not have much improvement in color, but the benefits are still many, which can make the screen brighter higher, thinner, brighter and less energy consumption. Therefore, the LED backlight display commonly seen on the market is actually not the replacement of display technology, and can only be said to be a replacement of the original. It is also not correct to confuse the LED backlight with an LED at the same time. LED backlight is better than ordinary LCD, and LED is better than LED backlight.