The nearest monitor industry, quantum dot display technology fire, major manufacturers have become a quantum dot display, but the monitor industry cannot be killed, the quantum point display is born, is it good, not too powerful, today is deeply Take everyone to see what is quantum point, what is a quantum point display.
What is a quantum point?
First, we need to understand what is quantum point (QD). The quantum dot is very small semiconductor particles, only a few nano sizes, so that their photoelectric properties are different from the photoelectric properties of larger particles.
The light-emitting principle is to apply a stimulation to the quantum dot material, and the material of the quantum dot will transmit a particular frequency of light, and these frequencies can be changed by changing the size and shape of the quantum dots, thereby achieving precise tuning.
It is simple to say that the photoelectric properties of the quantum dots are largely different from the previous light-emitting display particles, and the quantum dots are very small, in nanometers, resulting in a change in the display color of the quantum dots to change the size of the particles. Because of this, in theory, the chromatogram displayed by quantum dots is more continuous, and the cost will be lower.
In fact, it is nano-level particles, we know that many materials will have different physicochemical properties in nano-level, just that quantum dots are better listening.
The quantum dots of different sizes will emit different colors, and the quantum dots are generated when they are irritated by light or electricity, and the color of the light is determined by the composition of the quantum dots and the size of the general particles, the smaller the length of the wave. The larger the particles, the larger the short waves will be absorbed.
The amount of 2 nm size can absorb the red wave red, showing blue; 8 nm size quantum dots can absorb the blue wave blue, showing red. This feature enables quantum points to change the light color from the light source. Compared with the original display technology, the quantum dot display RGB three original color will be pure.
Application of current quantum dots on the display
In fact, quantum point technology is not emerging technology, and scientists in Bell Laboratory in 1983 have been studied.
However, after several years, the Physicist Mark Mark Mark Mark Mark, Yale University, was officially named "quantum dots" in this semiconductor microcontrol, so it is not a new technology in strict sense, just in recent In a few years, the display giants headed by Samsung have a strong interest in quantum dots technology.
I have a good understanding of the origin and characteristics of the quantum point. I have the application of the current quantum point on the display, what is the difference from the traditional LCD display and the same fireless OLED.
LCD panel
LCD panel structure
Let's first look at the long history of history, the LCD display structure is very complex, the structure of the LCD is placed in two parallel glass substrates placed in a liquid crystal cartridge, and a TFT (thin film transistor) on the lower substrate glass is placed. The color filter is provided, and the direction of rotation of the liquid crystal molecules is controlled by the voltage change in the TFT to achieve the control of each pixel point polarization light or not to achieve the purpose.
According to the light source of the backlight, the LCD display is divided into CCFL (cold cathode fluorescent tube) and LED (light-emitting diode), and the LCD and LEDs we are generally believed are erroneous, and it is completely major manufacturers. Mislee, both of them are only different from the backlight source.
Of course, the liquid crystal arrangement produces different panels will no longer be deeply invented.
OLED panel
OLED panel structure
The OLED panel is very different from the LCD panel. The OLED panel structure will be simpler. OLD is a fully called organic light emitting diode, that is, the light-emitting material of the OLED panel is organic material, compared to inorganic materials. Organic materials have a natural short board in terms of life.
OLED display technology has self-illuminating characteristics, which use very thin organic material coating and glass substrates. These organic materials will illuminate when there is currents, and the OLED display screen is visually angled and can save power.
Because of its own characteristics, OLEDs are more pure in black, because the material is not shining, the display is black, and the viewing angle is wide, the contrast is low, the reaction rate is high, the reaction rate is the characteristics of the OLED panel.
Quantum point panel
Quantum point panel structure
Quantum dots technology have been said before, no longer continue to repeat it, now there are differences in quantum dots monitors.
In fact, on the current quantum point screen, it is only the change in the backlight mode, which is the extension of the LCD panel, and there is no fundamental change.
Popular point, the current quantum dot display adds a film in the VA panel, which is the QDEF film in the figure above.
We all know that in the current LED backlight mode, in order to show three original colors, there are two backlighting methods:
One is to carry light directly through the RGB LED light, so that the cost is very high without the display; its second is the general backlight mode of the current commercial display: pseudo-white LED backlight, using the pixel point of phosphorch, what is a pseudo-white The LED backlight is to send a white backlight by adding a yellow phosphor in the blue LED (the Blue Leds position in the figure below).
This is also the source of the online rumors, "screen has a blue-racer hurt", but there is a sentence "Throp-the-dose talk toxicity is a rogue", as long as it is in line with the safety standard display, while reasonable use of eyes, it will not There is no need to worry about the rumors that spread the network.
Quantum point panel display principle
However, if it is colorful by quantum dots, there is no need to perform white light backlight. There are two reasons (which should be counted, it should be counted): the cause of photoluminescence, the blue quantum point cannot be debuted, so blue must be added in the backlight The color light source, which is because the current quantum dots are only responsible for green light and red light, so the white LEDs in the original backlight module must be replaced by Blu-ray LED.
At the same time, the QDEF layer is very placed in place, in order to let the light travel in the layer optical film, the repeated reflection is increased through the number of QDEF, so QDEF has to be placed in the most recent from the light source, one but the order Move, the conversion of red-green light is insufficient, which will cause a blue-blue phenomenon.
At the same time, the application of QDEF film and Blu-ray LED light source is also one of the quantum dot display color display is more pure.
So here, it will be said, in terms of the current quantum point display technology, it is only a change in the backlight of the screen, and a film is added.
How is the quantum dot technology so that the cattle actually experienced?
In fact, the technical prospects of quantum dots are very wide, not only to change backlighting, and quantum dot technology is moving towards the LED package (package quantum point material into the LED).
The current QDEF film is not cheap, with a 55-inch TV, a QDEF quote is about 100 dollars.
A large part of the source is because the material needs to drain oxygen, the quantum dots are inorganic, so in publicity claims that they are stable than OLED, but in fact, the quantum dots of nano-size are very sensitive, not only as hot as the phosphor, also I am afraid of oxygen as OLED, and I am a capital than OLEDs. It is really no such capital.
Many energy and costs are consumed in water hydraulic oxygen during commercial processes. The QDEF launched by 3m and Nanosys is an example, the QDef thickness is about 210 μm, wherein the upper and lower Barrier Film (the water-water oxygen layer) accounts for 110 μm, and the cost also accounts for half of the film.
Ordinary display (left) and quantum dot display (right) comparison
So what is the actual experience?
As we said, because of the special nature of the quantum point material, we can issue light close to the continuous spectrum, that is, the color of the quantum dot can be more delicate, the color gamut can be wider, this is also a large number of quantum dot display manufacturers to declare In the actual weakers, the comparison has also measured the corresponding quantum dot display, and it is much better than the non-quantum point display. This is also the material characteristics of quantum points.
User comment on a brand 27-inch 2K resolution quantum dot display grain feels serious
Our website has also been authorized to reprint the quantum point monitor experience of a netizen.
But we see the advantages, and we must also see the shortcomings of the current quantum point display.
In an e-commerce platform, many netizens found that the particles of the quantum dot display were very heavy after bought the display, even if the resolution of the display reached 2K (27 inch) level, there was still a very heavy particle feeling, the reason is unknown.
At the same time, because the current quantum dot technology is still an extended extension on the VA screen (LCD) panel, the LCD panel light leakage and bias is also existed on the quantum point display, which is current quantum point backlight technology unavoidable. I can only say to see the quality of each manufacturer.
DIY old driver summary
Comparison of quantum dots technology and OLED technology
So is it a good technique? Xiaobian seems to be a good technology, and the network has been related to quantum dot technology and OLED technology comparison, and it is definitely the PK of these two technologies. However, as far as the current actual experience is not necessarily better than ripe traditional LCD panels, don't say OLED panel.
Quantum dots technology future development direction
Of course, the current quantum dots cannot be particularly satisfied, but if they see the future of the quantum dots and the direction of development, there must be very vast space.
It can be divided into three stages:
First, replacing the traditional luminescent fluorescent powder;
Second, remove the color filter;
The three formats become a light-emitting layer (that is, the form of pixel points from OLEDs "
. The future quantum dot technology will inevitably bring fundamental changes to the monitor industry, even a revolution, but there is still a long way to go.
Original address: https://www.eeboard.com/news/liangzidianxianshiqi/
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