Generally speaking, the contrast of the TV is a very important technical parameter. Most TV manufacturers will mark the contrast of the product when they sell the TV. Some of the consumers who know a little bit will also use the contrast as a Core indicators. Unfortunately, the most important parameter of contrast is actually not available in the entire TV market. In this article, we will talk about the truth of TV contrast.
What is the definition of contrast?
In simple terms, contrast refers to the measurement of the different brightness levels between the brightest white and the darkest black in a light and dark area of ​​an image. The larger the difference, the higher the contrast. The smaller the difference, the smaller the contrast. . Friends who have watched ZOL TV evaluation must have understood that when we perform contrast calculation, we will play a pure white image and a pure black image on the TV in the darkroom, respectively, to measure brightness and finally use white. The brightness/black brightness calculates the static contrast.
From a visual point of view, the greater the contrast, the clearer the image will be, and the color will be brighter and brighter. Conversely, the lower the contrast, the more people feel that the screen is gray and the color loss will be serious. In fact, the contrast has more influence on the dynamic video display effect than the static, because the light and shade conversion in the dynamic picture is very fast, the higher the contrast, the person's eye can distinguish this kind of conversion process more easily.
Although there are many methods for measuring contrast at present, up to now there is no set of fair and effective standards to measure this data. Some manufacturers will use the center brightness method to measure; some manufacturers will divide the screen into nine points, then measure the brightness separately, and finally obtain the average value. So in a strict sense, no one product's contrast value is absolutely accurate, but for reference only. With the birth of new technologies, contrast will no longer be used as a reference standard.
OLED? Sorry, the contrast is infinite
The most talked about in the industry is that OLED will replace LCD. Indeed, OLEDs have many physical advantages that LCDs cannot match, such as self-luminescence, color truth, zero delay, and infinite contrast. The ultimate ultra-thin, flexible displays are all OLED features. At present, both the large-size TV field and the small-size mobile phone field are all transformed like OLED technology.
It is due to the self-luminous nature of OLEDs that when the screen is displaying a black field, the pixels do not emit light at all and the black color will appear more profound. According to the contrast formula, the white field brightness/black field brightness and the OLED screen contrast can be achieved. gigantic. After the popularization of OLED TVs in the future, we will no longer see the contrast screen parameter.
The future of QLED is also self-luminous
Quantum dots are also an innovative display technology. However, the current quantum dot technology is still developed on the basis of liquid crystal. It still needs the support of the backlight and stays in the “photoluminescence†stage. The ultimate goal of the development of quantum dots in the future is to achieve “electroluminescenceâ€, which is what we often call QLED. QLED technology, like OLED, can also achieve self-luminescence and achieve infinite contrast.
OLED and QLED are basically the same in the panel structure, but different in light-emitting materials (OLED is an organic light-emitting layer, QLED is a QD light-emitting layer), and the rest is completely the same from the cathode electrode to the package. Although QLED is still in the research and development stage, it is undeniable that QLED is the ultimate direction of quantum dots. This is also why we said earlier that the contrast of future TVs will no longer be the reference standard. Apart from OLED and QLED, the contrast parameters of LCD TVs also have no practical significance.
Dynamic contrast value has no reference value
When we buy LCD TVs, we often see manufacturers claiming that the contrast ratio can reach several hundred thousand to one, and even one million to one. This is usually a dynamic contrast parameter. We must know that dynamic contrast and true contrast are Two completely different concepts, the dynamic contrast of the same LCD TV is generally 5 to 10 times the actual contrast. Therefore, dynamic contrast is just a means for manufacturers to promote, and there is no real practical significance.
The easiest way to effectively control TV light leakage is to add dynamic contrast. The principle of dynamic contrast is achieved by controlling the backlight current. When a bright picture is presented, the backlight current is increased, which makes the whole picture brighter. When the picture is darker, the backlight current is reduced and the brightness is reduced. Low, and then get a larger contrast value. At present, the dynamic contrast function of many TV products is turned on by default. Even if it is turned off, it will retain at least half of the effect, so in this case, we cannot get the true contrast value.
Dynamic area backlight adjustment affects contrast
Dynamic backlight technology generally appears on high-end television products. The principle is to divide the backlight of the LCD TV into several areas for individual control. Under normal circumstances, high-end televisions will divide the backlight area into six, nine or more, and here we must mention the dynamic backlight master version of Sony technology, it can do each LED light source to control the switch, There are as many LED light sources as there are theoretically, there will be a number of backlight partitions, and the technical complexity can be imagined.
The addition of dynamic backlight also makes the meaning of contrast less and less, because the addition of this backlight technology will make the entire picture show different contrast values. Since the maximum and minimum brightness of each backlight area is not the same, different contrast values ​​will appear in different areas of the screen. It will not achieve the same maximum and minimum brightness standards as dynamic contrast, and there is no real contrast. The numerical value.
Written at the end:
This article analyzes the contrast from many angles. This parameter does not actually have a very large reference value. Contrast itself does not have an absolutely reasonable value, and there is no standard test method, just to see which vendor The contrast of the displayed image is more suitable to please the user's eye, and claiming ultra-high dynamic contrast is completely meaningless. At the same time, in the future TV market, we will no longer see the contrast standard parameter.
If you have been cheated for 20 years, will you refer to this value after you buy a TV?
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