Now that OLED has become the development trend of future TVs, it is trying to “stand in the C position” proactively and become the standard for high-end TVs. What is an OLED display? Is there any difference between it and an ordinary LED TV display? OLED display technology is different from traditional LCD methods. It does not require a backlight and uses very thin organic material coatings and glass substrates. When current passes through, these organic materials will emit light. Let’s learn more about the related knowledge of OLED displays!
Table of contents
What is OLED TV
OLED means “Organic Light Emitting Diode”, which is a relatively new display screen technology. “OLED TV” was first proposed by LG. LED TV displays use newer display technology, and LCD panels are no longer required. RGB color signals are directly displayed by OLED diodes. There is no doubt about the visual point of view of liquid crystals.
The basic structure of OLED is a thin, transparent, semiconductor-like indium tin oxide (ITO) connected to the positive electrode of electricity, plus another metal cathode, wrapped in a sandwich structure. All structural layers include a hole transport layer (HTL), a light-emitting layer (EL), and an electron transport layer (ETL). When the power is supplied to the proper voltage, the positive electrode holes and the negative electrode charge will be connected in the light-emitting layer, and bright light will be generated. The three primary colors of red, green, and blue are generated according to the different formulas, which constitute the basic color.
Advantages and disadvantages of OLED TV display
1. The advantages of OLED display
(1) The thickness can be less than 1 mm, which is only 1/3 of the LCD screen, and the weight is lighter;
(2) The solid structure has no liquid material, so it has better shock resistance and is not afraid of falling;
(3) There is almost no problem with viewing angle, even when viewed at a large viewing angle, the picture is still not distorted;
(4) The response time is one-thousandth of that of LCD, and there is absolutely no smear phenomenon when displaying motion pictures;
(5) The low-temperature characteristics are good, and it can still display normally at minus 40 degrees, but LCD cannot do it;
(6) The manufacturing process is simple and the cost is lower;
(7) Higher luminous efficiency and lower energy consumption than LCD;
(8) It can be manufactured on substrates of different materials and can be made into a flexible display that can be bent.
2. Disadvantages of OLED display
(1) The life span is usually only 5000 hours, which is lower than the LCD life span of at least 10,000 hours;
(2) Mass production of large-size screens cannot be achieved, so it is currently only suitable for portable digital products;
(3) There is a problem of insufficient color purity, and it is not easy to display bright and rich colors.
What is the difference between OLED TV and LED TV?
OLED TVs have a great advantage in black due to their self-luminous characteristics. When the TV is fully dark, the black displayed by OLED TV is deeper, while LED TV has the phenomenon of impure black. Ordinary LED TVs, due to the use of backlight technology, will have a certain impact on local dimming.
From the detail point of view, although OLED has excellent black performance, the black detail performance is still insufficient. LED LCD TVs perform better in detail. In terms of color, LED liquid crystal panels cannot emit colors and need color filters to obtain the required colors, while OLEDs can self-luminous display red, green, and blue colors, which is indeed better in terms of color gamut. In terms of brightness, as HDR technology has gradually become “standard”, LED LCD TVs have a great leap in brightness. However, the self-luminous characteristics of OLED make the light source need not pass through the filter plate, and the light will not be attenuated, so both have advantages.
2. Viewing angle
LED LCD TVs are prone to light leakage due to different and uneven backlight positions, resulting in a decrease in perception. The self-luminous effect of OLED TVs can solve this point. Regarding the lifespan of TVs, in fact, OLEDs are not as short as the rumors said. The lifespans of OLED TVs and LED LCD TVs are generally considered to be the same in the industry. In terms of prices that everyone is most concerned about, LCD TVs are far ahead at low prices, while OLEDs are relatively expensive due to cost issues. But as the penetration rate continues to rise, the price of OLED TVs will also show a downward trend.
Which is better, OLED TV or quantum dot TV?
1. Color gamut
From the perspective of color gamut, the NTSC color gamut of ordinary LCD TVs is only about 70% (the display pursues sRGB, and the TV is NTSC), while some wide color gamut TVs can reach more than 80%. OLED TVs can reach 95% or even higher inherently, so OLEDs have completely exploded ordinary LCD TVs in the color gamut
The higher the color gamut, the stronger the color rendering ability of the picture, especially the need to pursue a higher color display range on TV, and the higher the NTSC value, the wider the color gamut. Now we know that OLED can reach 95%, what about quantum dots?
Quantum dot TVs can easily achieve a color gamut of more than 110%, and the performance of the new generation of light quality dots is even more terrible. However, when the color gamut is high, the color accuracy will deviate, so it depends on your choice whether the color is rich or the color is accurate. In addition, the colors of OLED TVs are usually more accurate.
Often when we study LED TV displays, we will find that the brightness of the screen is not very high, and some even only have 200 nits, while quantum dot TVs can achieve 4000 nits. Of course, such high brightness is not used in daily use.
Ultra-high brightness is usually the most effective application scenario under HDR. In HDR technology such as Dolby Vision, the local brightness of the TV can reach 1000 or even 4000 nits, and it will be controlled at about 400 nits for daily use.
The peak brightness of OLED TVs is only 800 nits. Why? To put it bluntly, it is a matter of life. The self-luminous characteristic of OLED determines that each pixel is emitting light. If the brightness is too high, the lifespan will drop sharply. However, quantum dot TVs are essentially liquid crystals, so as long as there are more backlights, the basic idea is How bright it is, how bright it is. Quantum dots are better in terms of HDR bright effects.
In addition, some people on mobile phones used to say that OLED screens save power. In fact, OLEDs do not save power, especially when displaying a white screen, when all pixels are turned on, the power consumption is very large. The same is true in TVs, and because quantum dots or ordinary TVs rely on backlight sources to emit light, the picture will not be much higher than it is bright.
3. Control light
Both quantum dots and ordinary liquid crystals need to be illuminated by a backlight to emit light, so the performance of the backlight system is extremely important. We all know that some of the ground pictures in the video are dark, and some are brighter. Traditional side-lit backlit TVs have a light source from the side, and the light guide plate achieves the backlighting effect. The biggest advantage of this backlight mode is to simplify the backlight system, making the TV thinner and lower cost.
However, the side-lit backlight cannot precisely control the brightness of a local area in the picture. Therefore, when watching a movie, the TV picture will be gray when there are large black areas and large areas of light because the TV cannot be dimmed.
And each pixel of OLED can emit light independently, so LED TV display can kill any TV with light control ability.
How much is LED TV display?
At present, the price of OLED TVs is generally in the thousands of yuan, and the mid-to-high-end products are basically below 16,000 yuan.
TV size：32 inches，40inches，42 inches，48 inches，55 inches，60 inches，65 inches，70 inches，86 inches，etc
65 inch LED TV size:
Taking a 16:9 screen as an example, the length and width of a 65-inch TV are 143.90 cm and 80.94 cm, respectively.
The size of the TV generally refers to the diagonal length of the screen of the TV. According to the conversion of 1 inch = 2.54 cm, the diagonal length of the screen of a 65-inch TV is 65×2.54 = 165.1 cm, while that of a general 65-inch TV Most of the screen ratios are 16:9, so it can be calculated according to the Pythagorean theorem, and the screen length of the TV is about 144 cm, and the width is about 81 cm.
For example: the diagonal length of 47 inches is 119.38 cm, and there are two kinds of aspect ratios, 16:9 and 4:3; the long side of 16:9 is 104 cm long, and the short side is 58.50 cm long; the long side of 4:3 Measures 95.48 cm long and 71.61 cm on the short side.
Bigger isn’t always better for a TV. We can’t just look at the size of the screen, we also need to look at the screen quality, sound, functions, etc. of the TV. If the TV is too big, put it in the living room. Because of the limited space, it is easy to cause visual fatigue when watching TV. Although it looks good at home, it is not practical at all.
Let me talk about the conclusion first, LED display can replace LED TV. Because the current small-pitch LED display can be viewed within 1 meter, and our general viewing distance is within 2-5 meters, so the LED display can completely replace the LED TV to display the picture information.
However, in reality, due to the high cost of small-pitch LED displays, only some families with higher incomes are using them. Therefore, they have not yet replaced LED TVs in the public’s field of vision.