What is an OLED TV
OLED means “Organic Light Emitting Diode” and is a relatively new display screen technology. “OLED TV” was first proposed by LG. OLED TVs use newer display technology, and LCD panels are no longer required, and RGB color signals are directly displayed by OLED diodes, so there is almost no question about the viewing angle of liquid crystals.
The basic structure of an OLED consists of a thin and transparent indium tin oxide (ITO) with semiconducting properties, connected to the positive electrode of electricity, and another metal cathode, wrapped in a sandwich-like structure. All structural layers include a hole transport layer (HTL), an emissive layer (EL) and an electron transport layer (ETL). When the power is supplied to an appropriate voltage, the positive holes and the negative charges will be connected in the light-emitting layer to generate bright light, and the three primary colors of red, green and blue RGB will be generated according to their formulas, forming the basic color.
OLED TV Display Advantages and Disadvantages
1, OLED Display Advantages
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(1) The thickness can be less than 1 mm, which is only 1/3 of the LCD screen, and the weight is also lighter;
(2) The solid mechanism, no liquid material, so the shock resistance is better Well, not afraid of falling;
(3) There is almost no viewing angle problem, even when viewed at a large viewing angle, the picture is still not distorted;
(4) The response time is 1/1,000th of the LCD, there will be absolutely no smear in the display of moving pictures;
(5) The low temperature characteristics are good, and it can still display normally at minus 40 degrees, but the LCD cannot do it;
(6) Simple manufacturing process and lower cost;
(7) Higher luminous efficiency and lower energy consumption than LCD;
(8) It can be fabricated on substrates of different materials and can be made into flexible displays that can be bent.
2. Disadvantages of OLED display screen
(1) The lifespan is usually only 5,000 hours, which is at least 10,000 hours lower than that of LCD;
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(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 Vibrant, intense colors.
What is the difference between OLED TVs and LED TVs
1. Contrast
OLED TVs have Self-luminous properties have great advantages in black. When the TV is in full darkness, OLED TVs show deeper blacks, while LED TVs have impure blacks. Ordinary LED TVs, due to the use of backlight technology, will have a certain impact on local dimming. In terms of details, although OLED has excellent black performance, it still lacks in black detail performance, and LED LCD TVs perform better in details. In terms of color, LED liquid crystal panels cannot emit color, and color filters are needed to obtain the required colors, while OLED can display red, green and blue by self-illumination, which is indeed better in color gamut. In terms of brightness, as HDR technology gradually becomes the “standard”, LED LCD TVs have a great leap in brightness. However, the self-luminous properties of OLEDs allow the light source to pass through a filter without attenuating light, 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 appearance. The self-luminous effect of OLED TVs can solve this problem. In terms of the lifespan of TVs, in fact, OLEDs are not as short-lived as rumored, and the lifespans of OLED TVs and LED LCD TVs are generally believed to be almost the same in the industry. In terms of price that everyone is most concerned about, LCD TVs are far ahead with 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.
OLED TV or quantum dot TV which is better
1, color gamut
From the color gamut From an angle, the NTSC color gamut of ordinary LCD TVs is only about 70% (monitors pursue sRGB, and TVs are NTSC), while some wide color gamut TVs can reach more than 80%. OLED TVs can naturally reach 95% or even higher, so in the color gamut, OLED completely explodes ordinary LCD TVs
The higher the color gamut, the stronger the color rendering ability of the picture, especially on TVs that need to pursue higher Color display range, and the higher the NTSC value, the wider the color gamut. Now that we know that OLEDs can reach 95%, what about quantum dots?
Quantum dot TV can easily achieve more than 110% color gamut, and the performance of the new generation of light quantum dots is even more terrible. However, when the color gamut is high, the color accuracy will be biased, so the color is rich or the color is accurate depends on your choice, and the color of OLED TV is usually more accurate.
2. Brightness
Often when we study OLED TVs, we will find that their picture brightness indicators are not high, even some are only 200 nits, while The quantum dot TV 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 technologies such as Dolby Vision, the local brightness of the TV can reach 1000 or even 4000 nits, and it will be controlled at around 400 nits for daily use. .
And the peak brightness of OLED TVs is only 800 nits, why is that? To put it bluntly, it is the problem of life. The self-luminous characteristics of OLED determine 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 the backlight is done more, the basic idea is Make it as bright as possible. Quantum dots are better in terms of HDR brilliance.
In addition, people used to say that OLED screens save power on mobile phones. In fact, OLEDs do not save power, especially when displaying a white screen, when all the pixels are turned on, the power consumption is very large. The same is true in TV, and since quantum dots or ordinary TVs rely on backlight to emit light, the picture will not be much higher no matter how bright it is.
3. Light control
Both quantum dots and ordinary liquid crystals need to be illuminated by a backlight before they can emit light, so the performance of the backlight system is extremely important. We all know that some ground pictures in the video are dark, and some are brighter. The traditional side-illuminated backlight TV realizes the lighting effect of the backlight through the light guide plate because the light source comes from the side. The biggest advantage of this backlight mode is to simplify the backlight system, making the TV thinner and cheaper.
However, the side-illuminated backlight cannot precisely control the brightness of the local area of the screen, so when watching a movie, if you encounter a scene with large black areas and bright areas, the TV screen will turn gray, because the TV cannot be dimmed. .
And each pixel of OLED can emit light independently, so OLED kills any TV in terms of light control ability.
