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  • Release time: 2018 - 10 - 31
    Size400mmX400mmX80mmWeight4.2kg(/Plastic door/Not include suite )MaterialAluminumSingle cabinet suite numberNine modules per cabinetInstallationCrane girder hoisting and fixed installationColorBlack Cabinet 、Black 、blue and orange DoorWorking environmentBoth Indoor or OutdoorStandard accessories1 door 、2 positioning pins、1 electrical installation board、receive the card board、2 Connection pieces、3 quick lock
    Dimension400mmX400mmX80mmBox weight4.2kgTexture of materialAluminumUse environmentBoth indoor and outdoor.
  • Release time: 2018 - 10 - 31
    Size400mmX400mmX80mmWeight4.2kg(/Plastic door/Not include suite )MaterialAluminumSingle cabinet suite numberNine modules per cabinetInstallationCrane girder hoisting and fixed installationColorBlack Cabinet 、Black 、blue and orange DoorWorking environmentBoth Indoor or OutdoorStandard accessories1 door 、2 positioning pins、1 electrical installation board、receive the card board、2 Connection pieces、3 quick lock
    Dimension400mmX400mmX80mmBox weight4.2kgTexture of materialAluminumUse environmentBoth indoor and outdoor.
  • Release time: 2018 - 10 - 31
    Size400mmX400mmX80mmWeight4.2kg(/Plastic door/Not include suite )MaterialAluminumSingle cabinet suite numberNine modules per cabinetInstallationCrane girder hoisting and fixed installationColorBlack Cabinet 、Black 、blue and orange DoorWorking environmentBoth Indoor or OutdoorStandard accessories1 door 、2 positioning pins、1 electrical installation board、receive the card board、2 Connection pieces、3 quick lock
    Dimension400mmX400mmX80mmBox weight4.2kgTexture of materialAluminumUse environmentBoth indoor and outdoor.
  • Release time: 2018 - 10 - 31
    Module specificationCustomizableMaterial, size, colorCustomizableInstallation modeFast fixed installationScope of useIt can be used indoors and outdoors.
  • Release time: 2018 - 10 - 31
    Module specificationCustomizableMaterial, size, colorCustomizableInstallation modeFast fixed installationScope of useIt can be used indoors and outdoors.
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Advantages and disadvantages of CCFL, WLED and RGB LED backlights

date: 2018-10-22
Browse times: 0

At present, CCFL, WLED and RGB LED are still the three main backlight modes of LCD. Before you buy LCD, you can learn about these backlight knowledge. Because the backlight devices are inside the display, ordinary consumers can not directly see them. For example, WLED and RGB LED backlight display, the merchants say that they are LED screens, in fact, they are LED screens. The real LED screen should be designed like a billboard on the big square (as shown below). At present, there is no manufacturer in the world that can miniaturize it. So in the LCD market, we can only find another way. OLED may be a good choice.


The real LED screen should be like this:


I. Advantages and disadvantages of CCFL backlight screen


CCFL is called Cold Cathode Fluorescent Lamp (cold cathode fluorescent lamp), which is filled with inert gas (including some mercury vapor). It has phosphor layer on the inner wall. It looks like a fluorescent lamp tube. It looks like a neon lamp in a city. The structure installed in the LCD is shown in the following figure (Note: Actually, it has a fluorescent layer on the inner wall). Placement position and direction may be different, including the following LED placement position also has several design methods: before CCFL, most of them used EEFL backlight technology, CCFL backlight technology and the following WLED are very mature technology, while RGB LED is still not mature, to be exact, the design requirements are higher. As a result, it is difficult for many third-class manufacturers to design RGB LED backlight display with good quality.


Advantages of CCFL Backlight Screen:


Low cost, simple manufacturing process and mature technology.


CCFL backlight screen shortcomings:


Short life (fast aging), low luminous efficiency (power consumption), low brightness uniformity, low color purity, poor color performance, environmental protection, large volume, high driving voltage, impact resistance (see the big light bulb in the picture is sure not to fall).


2. Advantages and disadvantages of WLED backlight screen


WLED is called White Light Emitting Diode (white light diode). As an alternative way of CCFL backlight, WLED has not been improved in technology. When the backlight of display screen is changed to use LED, it will have the characteristics of power saving (about 20% less than CCFL), long life and shock resistance. The structure of backlight module is as follows:


1. Side WLED backlight: Side backlight needs to use a light guide (glue) to distribute the LED light evenly to the display area, so the concept of light leakage also arises. When the quality of the light guide film (plate) is not good or the adhesion between the structural layers appears problems, the light leakage will be very obvious.


2. Bottom WLED backlight:


The bottom uniformly distributed LED module is also a design method, which seems to be more complex than the first one. The whole backlight board needs to consider the welding and wiring problems. The view of the sky margin, when the devices are too dispersed, will definitely have a negative impact on the stability. If RGB LEDs are used, the response of RGB LEDs will be delayed.


Advantages of WLED Backlight Screen:


Low driving voltage, long service life, small size, light weight, good color performance, more uniform brightness, more environmental protection, impact resistance.


WLED backlight screen shortcomings:


Luminance and contrast are relatively low (RGB LED).


3. Advantages and disadvantages of RGB LED backlight screen


Although RGB LED and WLED look very similar, but its design requirements are higher. RGB LED is still the preferred backlight type for some high-end liquid crystal displays, so the price is also reasonable. RGB LED uses three basic tones and produces white backlight. In engineering, it has to consider the voltage and current changes. The color offset also needs to take into account the impact of RBG LED's complete failure or partial failure. Compared with WLED, its production cost is high and complex (shanzhai is not counted).


Advantages of RGB LED backlight screen:


Small size, light weight, higher efficiency, better lumen maintenance, better brightness and contrast.


Disadvantages of RGB LED backlight screen:


High manufacturing cost, color dispersion, color offset and other phenomena are unavoidable problems when using RGB LED. No matter how the technology develops, the white blended by RGB will always be different from that of WLED. In addition, RGB LED backlight will also encounter response time problems.


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