This article begins with a brief description of the simple device and the principles of the display
Led, lcd, oled, miniled, microled
1, led
The short name of the led is led, and the led, like the normal diode, is made up of a pn and has a one-way conductivity. When luminous diodes are added to the positive voltage, fluorescence of spontaneous radiation is generated by the injection of hollow holes from p to n and electrons from n to p, and by the combination of electrons from n and p, respectively, within a few micrometres near the pn knot. The energy status of electrons and hollows varies from semiconductor material to semiconductor material. When electrons and caves are combined, the energy released is different, and the more energy releases, the shorter the wavelength of the light. Red, green or yellow diodes are commonly used. The luminous diodes have a reverse blow-through voltage greater than 5 volts. Its positive-voltage curve is steep and must be used in a series of contours to control currents passing through the diode。
The core of the luminous diode is a chip of p-semiconductor and n-semiconductor, with a transition layer between p-semiconductor and n-semiconductor, known as the pn knot. In some semiconductor material pn knots, a small number of streams are injected when they are combined with most of them, releasing excess energy in the form of light, thus converting electricity directly into light. Pn adds reverse voltage, and a few streams are difficult to inject and therefore do not glow. When it is in a positive working state (i. E., at both ends plus positive voltage), when the current flows from the led anode to the cathode, the semiconductor crystal sends light of different colours from ultraviolet to infrared, the strength of which is associated with the current。
Every pixel point shown is a flash point. Use dynamic scanning to show (reduce power consumption)
Base 1. Monochrome: each pixel has an led tube core, which can be a red-light tube core, a halo tube core or a blue-light tube core. Because of the relative cost of blue-light tube cores, single-base colours use less blue-light tube cores. 2. Double-matrix: each pixel has two led tube cores: one red and one halo core. The pixels are red when the red tube core is lighted, the pixels are green when the pixels are bright, and the pixels are yellow when the red and green cores are bright simultaneously. Of which red, green is the color. 3. Full colour: all colour is formed by a combination of blue and red. Full-colour screen market demand is on the rise as a result of the gradual decline in the price of blue tube cores and the strong performance of the full colour。
2, lcd
Lcd (liquid crystal display) lcd display. Lcd is constructed to place lcd boxes in two parallel glass panels and to set tft (minum transistors) on the lower plate glass。
To control the direction of the liquid crystal molecule by changing the signal and voltage on the tft, the colour filter is placed on the upper plate glass to achieve the purpose of the display by controlling the diagonization of each pixel point。
The method of imaging of liquid crystals can be understood simply as the external application of voltage to deflect liquid crystal molecules from the perforation of light from back-light sources as a gate and thus to project the light into images in colour-colored filters。
2,oled
Oled is the acronym of the english-language organ light-emitting diode and is translated as an organic light-emitting diode or organic light display。
The structure of the old device is shown in the figure above. Oled is a double-injection luminescence device designed to emit energy, driven by external voltage, from electrons and hollows injected by electrodes combined in organic materials and transmitted to molecules of organic luminescence, which are stimulated, leaping from the underlying state to the stimulating state, resulting in a luminous irradiation when the radical molecule returns to the matrix。
No back-light source is required, lighting is used for organic materials and flexible displays, i. E., the technology used for folding screens and curve screens, are possible, but there are some disadvantages such as low lifespans, low refreshing rates, etc. Due to the characteristics of organic materials。
3-miniled
The led applications are divided into led backlights, led screens, led lighting, of which led lighting is the most widely used, by definition led lighting, such as indoor lighting, led car lighting, etc. The main application of led backlight is the lcd display technique, which uses led as a backlight source for lcd screens. Led screens are the main applications of oled or micro leds, which have recently become more hot。
Four, microled
The microled panel is also a spontaneous light panel, not a backlight technology like the miniled. Microled has the same advantages as oled, such as high brightness, high contrasts, extremely low delay and super-sightable angles, and, at the same time, because of the use of inorganics, i. E. Metal semiconductors, it has lower power consumption, higher temperatures and longer life expectancy. However, as technology is more sophisticated and does not have stable production mechanisms, costs are high and not affordable for everyone, so it has not been really pushed into consumer-level markets so far。
