It is said that 2017 is the first year of official display of OLEDs and quantum dot displays. The representatives of OLEDs and quantum dots are LG and Samsung. However, Samsung also produces OLED panels, and is also the world's largest supplier of small-screen OLED panels. LG is mainly producing large-screen OLED display panels, targeting the display and television fields. Recently, LG Display’s fourth-quarter profit plummeted 95%. OLED is also a pile of defects. It is common to burn screen Tucao, and quantum dot display technology is currently half dead, two prices are dead expensive, compared with the current LCD screen really does not necessarily have advantages.
LCD / quantum dot / OLED technology comparison analysis: OLED faults Quantum dots half dead
Each panel structure
LCD panel structure

LCD / quantum dot / OLED technology comparison analysis: OLED faults Quantum dots half dead

Let us first look at the long history of LCD display technology, LCD display is a multi-layered complex structure, LCD structure is placed in two parallel glass substrates in the liquid crystal cell, the bottom substrate glass is set on the TFT (thin film transistor), on A color filter is disposed on the substrate glass, and the direction of rotation of the liquid crystal molecules is controlled by changing the signal and the voltage on the TFT, so as to achieve the purpose of controlling whether the polarized light of each pixel is emitted or not.
According to the light source of the backlight, the LCD monitor is divided into two kinds of CCFL (cold cathode fluorescent lamp) and LED (light emitting diode). Many manufacturers publicize themselves as LED displays, leading us to believe that LCD and LED are two types of display screens. The mistake is entirely misleading by the majority of manufacturers. Both are just different from the backlight source.
OLED panel structure

LCD / quantum dot / OLED technology comparison analysis: OLED faults Quantum dots half dead

The OLED panel is different from the LCD panel in comparison. Compared to the OLED panel, the structure of the OLED panel will be simpler. The OLED is collectively referred to as an organic light emitting diode. That is, the light emitting material of the OLED panel is an organic material, which is organic compared to the inorganic material. Materials have inherent shortcomings in life. The OLED display technology has a self-luminous characteristic, and adopts a very thin organic material coating and a glass substrate. When an electric current passes through, these organic materials emit light, and the OLED display screen has a large viewing angle and can save electric energy. Because of the characteristics of self-luminescence, OLEDs perform more purely in black because the material is black as long as it does not emit light. At the same time, the wide viewing angle, high contrast, low power consumption, and high reaction rate are characteristics of the OLED panel. Currently, there are RGB OLEDs and white OLEDs. RGB OLEDs are mainly used in small screens, while white OLEDs are mainly used in large screen televisions and the like.
Quantum dot panel structure
LCD / quantum dot / OLED technology comparison analysis: OLED faults Quantum dots half dead
In fact, with regard to the current quantum dot screen, the traditional LCD panel has only changed the backlight mode. It is an extension of the LCD panel and there is no fundamental change. Popular point of view, the current quantum dot display is to add a film in the VA panel, which is the QDEF film in the picture above. The current quantum dots are only responsible for generating green and red light, so the white light (WLED) LEDs in the original backlight module must be replaced with blue LEDs. At the same time, the application of QDEF film and blue LED light source is one of the reasons why the color display of the quantum dot display is more pure than the ordinary display.
The advantages and disadvantages of each panel performance
Well, after the basic information of the panel is finished, let's talk about our respective advantages.
Yield rate: Due to many years of technical iterations and upgrades, LCD panels have significantly higher technology maturity than OLEDs. Quantum dots are also rooted in LCD panels. Therefore, the yield rate is higher than that of OLEDs. LCD ≥ quantum dots> OLED
Color gamut: OLEDs and quantum dots will be significantly better than LCD panels, which is also a feature that is being advertised. From a parameter point of view, the advantages of OLED in color gamut are not obvious, but this is based on the best OLED and top quantum Judging from the point of comparison, the OLED panel will actually be slightly better than the LCD and quantum dots. OLED> Quantum Dots> LCD
Light Leakage Control: OLEDs completely hung LCDs and quantum dots. Both LCD panels and Quantum Dot Panels are shaded by adjusting the alignment of the liquid crystals. This can never completely block the backlight, and light leakage is inevitable. OLED>LCD=Quantum Dots
Color/brightness uniformity: In terms of color/brightness uniformity, because of the backlight mode of the LCD panel and the quantum dot panel, the best uniformity cannot be achieved, and since the OLED emits light spontaneously, there is no need to diffuse the backlight, and uniformity More consistent. OLED> Quantum Dots ≥ LCD
Contrast: Contrast is the difference between the brightest white and the darkest black of the screen, and the LCD can have higher brightness support due to the factors of the individual backlight module, while the OLED has no need to worry about the characteristics of light leakage, and the black is purer and overall. On the other hand, OLEDs will have better contrast than others. OLED>LCD=Quantum Dots
Viewing Angle: The best IPS panels can be compared with OLEDs in terms of viewing angles, but the current VA panels commonly used in quantum dot displays do not have the best viewing angle. OLED≥LCD> Quantum Dots
Power control: The OLED panel requires individual power supply for each pixel. The higher the resolution, the more power is consumed. With the same brightness, LCDs and quantum dots consume less energy than OLEDs. This is why quantum dots often mention themselves as less energy-consuming than OLEDs, but basically LCDs consume more energy than OLEDs. less. Quantum dots ≥ LCD > OLED
Thickness control: LCD and quantum dot structure are more complex, plus the backlight module, the thickness of the OLED is simpler than the simple structure, so the thinning of the mobile phone today, this effect is particularly important. OLED> Quantum Dots ≥ LCD
From the above, it seems that OLED has won all the time. The performance of the screen is better than that of quantum dots and LCDs. Even the most mature LCD panels have been smashed to the ground. However, in reality?
OLED may not perform so well at all
LCD / quantum dot / OLED technology comparison analysis: OLED faults Quantum dots half dead
In fact, it is still necessary to return to the panel's more important issue: cost.
At present, OLED technology is not yet fully mature, the yield is low, the industrial chain is not very perfect, and the scale effect has not yet been formed, and the cost remains high. And Samsung's RGB OLED and LG's white OLED are not the same, the so-called white OLED, is the direct use of white-emitting OLED devices (actually a yellow OLED and blue OLED devices stacked together) as a pixel point light source, and then through Red, green, and blue color filters filter out colors (similar to LCD panels). RGB OLEDs, on the other hand, emit light in RGB colors for each pixel and do not require a filter.
White OLEDs have low technical difficulty, rapid volume production, high profits, and attractive appearance. This is the technology adopted by LG's leading OLED camp. The current OLED color TV market is full of white OLED technology TV products. If RGB OLEDs are used for large-screen production, technical complexity is difficult to produce, and the yield rate is extremely low, LG Samsung does not have a good solution. This is why Samsung, Hisense and TCL are unwilling to introduce OLED TVs.
There is also a natural defect that OLED is currently very important: burn screen.
However, even if LG is using white light OLED yield is not good, the cost has remained high. And not only the yield cost problem, white light OLED has insurmountable defects, that is, heavy shadow, low brightness, large power consumption, short life, poor pixel quality.
Many OLED TVs in shopping malls require that tellers not be allowed to put programs with station signs, cannot keep still images, and need to rest for long hours.
LCD / quantum dot / OLED technology comparison analysis: OLED faults Quantum dots half dead
And don't just look at the problems with white OLEDs. Even Samsung's current production RGB OLEDs are also burned and green lines. Since Samsung's own s-series and noto series enabled OLED panels to start burning screens, the problem has not been broken, and afterimages have been associated with the life of mobile phones.

Apart from the cost factor, the problem of burn-in will be more serious for the monitor. For example, the resident task bar at the bottom of the screen, the resident icon on the desktop, etc., is not more serious for burning screens. This is one of the reasons why OLEDs are afraid to involve monitors.

to sum up
LG's LCD panel business was hit hard, with year-on-year shipment declines and profits plummeting. However, it is not a good idea to immediately hope to see a lot of OLEDs that are still suffering. Samsung's hand-holding of quantum dots and OLED core technologies has not yet shaken the current LCD panel. The transition to OLED and Quantum Dots over the years has caused consumer expectations to rise. The result is presented to consumers. A product with many flaws. For now, even for a period of time in the future, OLEDs and quantum dots are not yet realistic to win LCDs. Don't always advertise how new the panel is, or just solve the actual problem first and honestly.