As the backlight system of the latest generation of LCD panels, LED backlight beads have many advantages over traditional CCFL backlights and also have some disadvantages. Below, Shenzhen Development Optoelectronics will list the advantages and disadvantages of the LED backlight bead as follows, understand these will help you more rational choice of LED backlight display.
Advantages:
First, more energy-efficient. Compared with CCFL backlights, LED backlight beads are significantly energy-efficient, and generally the same level of civilian-grade products can save more than 40%. According to our evaluation data, some high-quality LED-backlit displays can save more than 60% energy compared with mainstream CCFL products, which is absolutely energy-efficient. And, with the further development of LED backlight technology, LED backlight displays may be more energy-efficient in the future.
(Energy saving is certain, but it is not used as much as you think 60%, 40%. For example, a mainstream CCFL tn monitor has a maximum power consumption of 40W, LED backlight has a maximum power consumption of 20W, and usually only has a difference of 10w at 50 brightness. Left and right.)
Second, green. Mercury in the backlight of CCFL is a material that is harmful to the environment, but LED backlight does not contain such harmful substances. We know that the total global output of displays in 2009 will reach 220 million units. If the future of LED backlight displays becomes popular, it will greatly contribute to the improvement of the global environment.
Third, a wider color gamut. Since the LED backlight module is more pure than the white light emitted by the conventional CCFL, it is easier to use the LED-backlit display to increase the color gamut. The improvement of the color gamut can make the display display more colors and make the color performance better.
(The color gamut is on the one hand, the panel nature is the other side, and the final color is “filtered” on the panel. The TN screen color of the wide color gamut is over-saturated. It is relatively good to the human eye, but the actuality is not enough. The wide viewing angle and wide color gamut It is king.)
Fourth, longevity. In theory, LED backlights have a longer lifetime and a longer luminance decay cycle than CCFL backlights. And as the technology matures further, the lifespan of LED backlight still has room for extension.
(LED backlight life and drive power life often do not match, especially low-cost, the final life is not determined by the backlight system)
Fifth, lighter and thinner. The LED backlight system is lighter and thinner than the conventional CCFL backlight, and the LED-backlit display may also be made thinner. Especially the thin one is very much in line with current consumer demand for fashion. One of the main features of many LED backlit displays on the market today is "thin".
Disadvantages:
First, the LED backlight system's luminous efficiency is still far less than the CCFL backlight. In simple terms, the brightness of the display with LED backlight will be lower, for example, the brightness of the general CCFL backlight display will be 300cd/m2, and the lower one will be more than 250cd/m2; but the brightness of the LED backlight display is Most of them are under 250cd/m2, and even more, the brightness is below 200cd/m2. As we all know, the display with too low brightness will have poor display performance, and its applicability will be poor. The demand for high brightness for movies, games, and games will inevitably be overwhelming.
(So it's not really energy saving, but it's often the maximum brightness. Take the w number and flicker. The brightness of 80 is equivalent to the brightness of CCFL 50, usually within 10W with energy saving)
Second, uniformity. The LED backlight is a point light source, and the uniformity becomes more difficult to control than the CCFL with the conventional line light source. In order to control the uniformity of light, the brightness characteristics of each LED must be consistent in the selection. In addition, if the lifetime of a certain LED ends first, light uniformity will be greatly affected. As far as the current market situation is concerned, although major display manufacturers are promoting LED backlighting displays with better uniformity, the performance of most products is actually very general.
Third, the color is difficult to control. As we all know, measuring the quality of a monitor is not a matter of color, or whether it is gorgeous or not, but whether the color is accurate. As a mature backlight, CCFL has been excellent in color control after years of improvement and optimization. As far as the LED backlight technology is concerned, the contradiction between the color gamut and the light efficiency cannot be solved, and the color control is very difficult.
This is mainly due to the fact that professional-grade displays with stringent color requirements have a relatively large impact, as the consumer-level display color control itself is not as stringent, and the LED backlight beads cause a slight color cast that is relatively easy to accept.
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