What is the difference between OLED and LED? Even though they are only one letter apart, their techniques are completely different.
In the current TV market, the frequency of replacement is getting faster and faster. Whether it is a domestic brand or a joint venture brand, new products have been launched at the same time. This is inseparable from the continuous improvement of people's pursuit of vision, and the willingness to purchase has changed from the initial "can see" to the current "enjoy viewing". Among them, OLED TV has achieved significant growth in the high-end TV market share, which has once again stimulated the purchasing desire of consumers.
There are essential differences between LED screens and OLED screens in terms of light-emitting principles.
The full name of LED is light-emitting diode, which is a semiconductor component. The type of LED product packaging structure is also classified according to the characteristics of light emission color, chip material, light emission brightness, size and so on. A single die generally constitutes a point light source, and multiple die assemblies can generally constitute a surface light source and a line light source for information, status indication and display. In parallel), it is combined with a suitable optical structure to form the light-emitting section and light-emitting point of the light-emitting display. Since the LED is very sensitive to the passage of current, a very small current can make it emit light. So as to realize the display screen of various information such as text, image, graphics, animation, video, video signal, etc. Its process cost is high.
OLED is an organic light emitting diode, which is called organic electroluminescence display technology. The light-emitting mechanism and process are that electrons and holes are injected from the cathode and anode, respectively, and the injected electrons and holes are transported in the organic layer and recombined in the light-emitting layer, thereby exciting the molecules of the light-emitting layer to generate singlet excitons. The state exciton radiation decays and emits light.
Contrast OLED screen can be infinite
From the perspective of contrast, the LED screen cannot be controlled for each pixel. When displaying black, it mainly relies on the deflection of the liquid crystal molecules to shield the backlight. Therefore, when the LCD panel displays a black screen, there will be some light leakage, and the ultimate black field cannot be obtained. OLED technology, on the other hand, can turn off individual pixels, reducing their brightness to zero. In theory, the contrast ratio of OLED technology can be infinite. In the actual display effect, the video content mainly in the dark scene is that LED can't achieve no light leakage, while OLED can easily deal with it.
OLED is unlikely to have light leakage under black field, thereby improving contrast and image quality performance. Therefore, for those who pursue the ultimate experience and sense of substitution, I am afraid that only OLED TVs can meet their needs.
Screen structure OLED can be as thin as paper and bend and fold at will
In terms of structure comparison, the OLED screen is simpler than the LED structure, which means that the OLED screen can be made thinner. From the perspective of light-emitting principle, LCD liquid crystal screen is used for display, and it does not emit light itself, so it needs a backlight source; while OLED organic diode does not need a backlight source, it emits light and displays color by itself. OLED can probably achieve 1/3 the thickness of traditional LED screen. In the future, OLED TVs are expected to achieve a thickness of less than 1mm, which is beyond the reach of LEDs.
OLED also has the characteristics of flexibility and bendability, which can not only be applied to TVs, but may also make smart devices full of imagination in the future. Combined with the thin characteristics of OLED, the screen can be made as thin as a piece of paper and can be bent and folded at will, which is unimaginable in the LED era. OLED can be called another revolution in the form of display products.
OLED is better for visual health than LED
From an experience point of view, OLED screens are obviously more advantageous than LEDs, because OLEDs are self-illuminating, and the wavelength is closer to natural light, which is less harmful to human eyes; and LED screens will inevitably cause blue light harm to the eyes, although Short-term viewing has little impact, but if there are children aged 1-10 at home, you need to properly control the time children watch TV.
As the next-generation display technology, OLED display technology will be widely used in smartphones, VR, wearable devices, TVs, tablet computers, smart cars, etc., and the overall market prospect is broad. According to relevant data, it is predicted that global OLED shipments will reach 900 million units in 2020, which will be 2.5 times that of 2015, with a compound annual growth rate of 20%. In addition, as BOE, CSOT and other manufacturers have seized the commanding heights of the OLED market, the pace of the domestic display industry to break through the monopoly of Japanese and Korean companies has been accelerated. Some analysts predict that global OLED smartphone panel shipments will reach 1.37 billion units in 2019, and will surpass LCD panel shipments for the first time in 2020, becoming the mainstream of the market.
