​ What difficulties are currently facing LED-backlit displays?

Jul 24,2021| LED Knowledge

LED-backlit LCD monitors have been on the market for the past two years and have attracted a lot of attention. For example, LG’s upcoming 22-widescreen LCD W2286L and 24-widescreen W2486L, and Dell has launched G series LCD G2210, G2410, etc., so why don’t the users who actually buy it? many?

Difficulty 1: Excessive cost

Regardless of whether it is a netbook or a notebook computer, the screen size is basically below 15 inches, and they use relatively low-cost white LEDs. Due to the relatively small size of the LED backlight module they carry, the cost and the CCFL backlight are not too far apart. The screen size of liquid crystal displays is basically 22 inches or more, and the actual area of the screen is several times or more larger than that of notebook computer products. Therefore, even the relatively low-cost backlight LED module is more expensive.

Since the three-color LED backlight module is more complicated in structure than ordinary white LEDs, its cost is more expensive. Take VLED221wm, the first three-color LED backlight consumer LCD display launched by ViewSonic as an example. The LCD display has a screen size of 22 inches and a screen ratio of 16:10, but its listing price is as high as NT$6,999. 

The price of an ordinary 22 widescreen LCD is around NT$2,000. Although the price of VLED221wm has been lowered to NT$2,700, the price of mainstream 22 widescreen LCDs has dropped to NT$1200. It can be seen that the cost of tri-color LED backlight is relatively expensive.

Compared with three-color LED backlight LCD, the price of using ordinary white LED LCD is relatively cheaper, but it is still hundreds of yuan more expensive than CCFL LCD with similar functions. 

In the current economic environment that is not optimistic, consumers tend to pay more attention to price when purchasing products, and are more willing to buy cheaper CCFL backlit LCD monitors.

LED backlight display can make the display effect of LED display more vivid

Difficulty 2: Inaccurate color control

Many people have such a misunderstanding: LCD monitors using LED backlights must be able to have a richer color gamut, but this is not the case. The white light LED backlight is the same as the ordinary CCFL backlight without phosphors and other substances, and generally can only provide about 72% of the NTSC color gamut. 

If a three-color LED backlight is used, the color gamut value of the liquid crystal display can easily reach more than 100%. For example, the color gamut value of ViewSonic VLED221wm is 118%.

However, graphic users who have used consumer-grade wide color gamut will find a problem. Although ordinary wide color gamut liquid crystal displays can provide richer colors, they are limited by the display IC chip. Most wide color gamut models have certain problems. 

Color cast, or the color is too saturated, the color reproduction is not particularly accurate, so for some graphics or professional users who require high color accuracy, such LCD monitors obviously cannot meet their requirements.

As for the tri-color LED backlight with a wider color gamut, if you want to control the colors more accurately, the requirements and capabilities of the LCD control IC are higher. Therefore, when we generally use spider or Eyeone color calibration instrument to test consumer-grade three-color LED-backlit LCD monitors and LCD TVs, we will find that the red or other primary colors in the three-character gamut chart will emit excessive overflow.

Difficulty 3: Upstream manufacturers’ equipment updates and market demand

Upstream panel manufacturers and backlight module manufacturers have been producing CCFL backlight modules, and their production equipment has been introduced for the production of CCFL backlight sources. After several years of production and use, these upstream manufacturers have gradually become profitable, and the equipment is still recovering.

 When the service life is not reached, manufacturers also hope that they can create more profits for themselves. However, whether it is to produce white light LED backlights or higher-end three-color LED backlights, it is necessary to use different production equipment from CCFL backlight modules. 

That is, to manufacture LED backlight modules on a large scale immediately, these module manufacturers must replace new equipment. And the existing CCFL module production equipment will all be "waste". This obviously requires the module manufacturer to spend a huge cost, and no one will make the decision to replace the whole line immediately if anyone becomes the boss.

The use of LED backlight display in the meeting room

Some module factories with sufficient funds and sufficient production capacity will continue to produce CCFL backlights while gradually introducing new LED backlight production equipment, thereby gradually replacing the traditional CCFL backlight production equipment. But this requires a long process to achieve, not a day's work.

The strategy of upstream backlight module manufacturers will also result in relatively small production capacity of LED backlight panels by panel manufacturers, and further affect downstream display manufacturers. In addition, many display manufacturers are still testing the water in the field of LED backlighting, with relatively few products launched, and few flagship models. Display manufacturers such as Samsung and LG are still cautious and have not yet launched consumer-grade LED-backlit LCD displays. Therefore, the space for consumers to purchase has been greatly compressed, and consumers will think that LED-backlit LCD is not necessary to buy, ordinary CCFL LCD can fully meet their needs, and the price is cheaper, so users also lack one Reasons to buy LED backlight.

  Article KeyWords:LED-backlit displays


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