In the video field, the screen is basically a measure of all the indicators of a good or bad product. However, consumers do not have much opportunity to have a deep understanding of display technology. They often obtain product information by simply investigating information on the Internet, advertising advertisements from manufacturers, and oral presentations from merchants. In this market model, many businesses have explored "business opportunities", and they can often seek their best interests with overwhelming advertising.
LED display five sins
It must be mentioned at this point that the hot LED backlit displays that are currently being advertised are also among the over-promoting and exaggerating advantages. First of all, the author should recognize that the civilian-grade LED-backlit liquid crystal display has the following advantages: low power consumption, small body size, low heat generation, low radiation, long life and so on. Although there are so many advantages, LED display technology has many shortcomings and shortcomings like humans.
Below, the author wants to expose the imaginary, useless or even fabricated LED product information and propaganda in the overwhelming publicity, and introduce it to everyone in the form of seven original sins, in the hope that everyone can objectively see the LED backlight. The item shows emerging technologies in the field.
One of the original sins: white LEDs are confused with OLEDs
The author did not hesitate to put the misunderstanding of this propaganda first. Low power consumption, ultra-thin and good color are the advantages of civilian LED backlights in many consumers' eyes. Is this true?
From CCFL to LED, from the perspective of the promotion of various manufacturers, the advantages of LED are to improve the picture quality and make the display body thinner. The author points out that these two advantages come from two different LED technologies, that is, the two advantages do not exist on one display at the same time.
The image quality is improved by RGB-LED. It is said that white light is synthesized by red, green and blue three-color LEDs. It is similar to the mechanism of three-primary fluorescent lamps compared with ordinary fluorescent lamps. Isn't it that some people say that the spectrum is narrow? I will use one of the three primary colors to spell out one. . The display using this technology is mostly a direct type arrangement (ie, the light emitting elements are vertically distributed behind the liquid crystal panel). The advantage is that the gamut of the RGB-LED backlight can far exceed the NTSC color gamut to achieve a true light gamut. Disadvantages are power consumption (three primary color synthesis), large size (direct exposure), and expensive (often professional-grade displays will be applied).
Ultra-thin is now a popular white LED (W-LED) backlight, which is also used in civilian-grade LED displays. It is a bit funny, in order to produce a continuous spectrum, the white light of the W-LED is not generated by electroluminescence, but is surrounded by a circle, and the blue light generated by the electroluminescence excites the phosphor light emitted inside the LED. . Simply put, it is very similar to the traditional CCFL backlight technology. Only one of the catalysts is ultraviolet light generated by high voltage, and the other is blue light (ultraviolet light) generated by electroluminescence inside the diode. Therefore, its superiority in the color gamut is gone.
At this time, the truth has surfaced. The ultra-thin, low-power white LEDs and the wide color gamut and color advantages of RGB-LEDs are irrelevant, and the gamut advantages of the civilian LED displays introduced in some advertisements are only taken out of context!
Original sin two, three: LED display fever, long life
Compared with light efficiency and spectrum, the advantage of LED in the service life is the least objectionable. The life cycle is tens of thousands of hours, enough to stand out from the crowd. But longevity has a premise: the temperature and current must be controlled within a reasonable range.
Low power = low fever? The answer is no.
LEDs have light decay. It depends on the current in your design, the heat dissipation, and the quality of the LED itself. The natural enemy of life is heat dissipation. Generally, the junction temperature of LEDs cannot exceed 80 degrees, otherwise the life is greatly shortened. This is a far cry from the operating temperature of a typical semiconductor device of 150 degrees. At present, most LED packages are basically 1, aluminum substrate, 2, ceramic substrate. It must be thermally coupled to the heat sink when in use. The direct cause of high temperatures is the "overclocking" of large currents. Because the price difference between LEDs of different specifications is very different, some manufacturers artificially increase the current in order to make the LED brighter. The current is inversely proportional to the efficacy. The current increases from 350ma to 1A, and the light efficiency drops from 100lm/w to less than 50lm/w. The excess energy is apparently dissipated as heat.
Therefore, civilian-grade LED displays often sacrifice brightness in order to achieve long-term life. Even low brightness is a weakness, and if you see a low-cost and high-brightness LED display, then you should be careful.
Original Sin 4: Large viewing angle
In fact, the difference between CCFL backlight and LED backlight and wide viewing angle is not obvious. If consumers are concerned about the viewing angle of the display, please look at the viewing angle parameters and evaluation in our evaluation article before purchasing.
The original sin five: choose it when the price difference is low
At present, there is such a saying on the Internet: it is nothing more than expensive dozens or two hundred dollars, it is better to buy a new wave of LED-backlit displays. However, the author should correct this concept or the word-of-mouth advertisement. For different monitors, the difference between the LED backlight and the CCFL backlight will be very different, and compared with other performances, LED is not the only choice.
The author considers the most sly thoughts: If you buy a good quality 19-inch LED display, you need about 900 yuan, and the same money can also buy a low-cost HD 21.5-inch display. The budget for a 21.5-inch LED-backlit display may also be able to purchase a large-screen display or a wide-angle display. As the size increases, the cost of LED backlights will continue to increase.
Therefore, compared with the choice of LED-backlit display, you may wish to consider whether there is a more suitable choice for you?
Summary: What are the advantages and disadvantages of coexisting LED development trends?
LED-backlit displays have a thinner, more sleek look and are a very environmentally friendly technology (without mercury). Although the development prospects of LED backlights are promising, the LED light source technology is still not perfect at this stage. Challenges such as cost, light efficiency, and brightness uniformity control still require technical improvements.
The author has done a survey on LED-backlit displays. The data shows that for nearly half of netizens, LED-backlit LCDs are more attractive, and LED technology is indeed receiving much attention. The author believes that overall LED technology is good, but not mature enough. Everyone still has to recognize the advantages and disadvantages of LED backlighting. Don't blindly follow the trend of advertising. Only by truly understanding the truth can you purchase your own products.
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