On the surface, QLED and OLED are ostensibly different from organic and quantum dots, but in fact, the difference between the two is almost the whole world.
(In this article, OLED, QLED, LED all refer to the display, that is, OLED display, QLED display, LED screen)
In simple terms, OLED is based on the principle of organic electroluminescence, while QLED is based on the principle of inorganic electroluminescence (or photoluminescence). Since the thermal and chemical stability of inorganic substances is generally higher than that of organic substances, QLED theoretically performs better in key indicators such as light source stability and life, which is why some people think that QLED is the next generation of display technology worth looking forward to.
According to the previous statement, QLED is an LED that emits light through inorganic matter, and OLED is an LED that emits light through organic matter. Q and O are like dad, LED like mom. LED – light-emitting diode light-emitting diode. This device includes a positive electrode and a negative electrode. When the current flows from the positive electrode to the negative electrode, through the light-emitting material in the diode, the current excites it to release light energy, and we can see that it is on.
Although they are based on the principle of LED, QLED screens and OLED screens are far stronger than ordinary LED displays in terms of luminous efficiency, pixel density, color performance, and energy consumption control. This is because the core light-emitting device of LED lamp beads is electroluminescent semiconductor chips, and the manufacturing process is relatively simple. Even high-density LED displays (small pitch LEDs) can only achieve a dot pitch of 0.7 mm: In the preparation process of QLED and OLED, there are specifications of scientific research level from materials to equipment, so that only a few countries such as Germany, Japan, and South Korea that can get involved in the upstream supply chain are steadily advancing in extremely high technical barriers based on future black technology standards, and the results presented are inevitably not comparable to "workshop" products.
In the production process, OLED because the light-emitting center is an organic molecule, and currently adopts the evaporation process, that is, the process of processing the luminescent material into a small molecular structure at high temperature, and then re-condensing at the specified location. This method is extremely demanding on the environment, complex processes, sophisticated equipment, and most importantly, it is difficult to meet the production needs of large-size screens. The light-emitting center of QLED is semiconductor nanocrystals, which can be dissolved in various solutions. It can be prepared by solution, which on the one hand can effectively reduce the manufacturing cost, on the other hand, it also breaks through the limitation of screen size.