【Collection】One article to understand LCD LED OLED QLED

We often see LCD, LED, OLED, QLED, although there is only one letter difference, but the difference is very big! Today, I will explain it in detail here for your reference and study.

LCD

LCD is the full name of Liquid Crystal Display, mainly including TFT, UFB, TFD, STN and other types of liquid crystal display.

The structure of LCD is to place a liquid crystal cell between two parallel glass substrates. TFT (thin film transistor) is set on the lower substrate glass, and a color filter is set on the upper substrate glass. The liquid crystal molecules are controlled by the signal and voltage changes on the TFT. Rotate the direction, so as to control whether the polarized light of each pixel point is emitted or not to achieve the purpose of display. LCD is a substance between solid and liquid. It cannot emit light by itself and requires additional light sources. Therefore, the number of lamps is related to the brightness of the liquid crystal display.

LED

LED (Light-emitting diode) screens, in fact, the images of these displays are still produced by liquid crystals. The light-emitting diodes are only used as light sources. Technically, they are still LCD displays, or LED-backlit LCD TVs.

LCD TV with LED screen has the advantages of small size, low power consumption, long life, low cost, high brightness, long viewing angle and high refresh rate. The disadvantage is that the color performance is relatively poor, especially when the LCD screen is folded. The color deviation is more obvious.

OLED

OLED (Organic Light-Emitting Diode) organic light-emitting diodes, although there is only one letter difference between it and LED, they actually describe completely different things. We all know that the liquid crystal panel emits light through the backlight, which produces a variety of different colors through the refraction of the liquid crystal molecules. The liquid crystal molecules themselves cannot emit light, and the LED only refers to the backlight. The OLED can emit light by itself, so there is no need for a backlight. LED uses metal materials, while OLED uses organic materials. It can emit light without being illuminated by light, and the contrast is better. Normally, LEDs need to be illuminated by backlight to see things. At present, the materials used in light-emitting diodes are all inorganic semiconductor materials, which are difficult to apply to large areas and require high-resolution components (EX: screens). To solve these problems, new organic semiconductor materials (that is, those containing hydrocarbons) are required. Material), coating it on a conductive glass sheet, and passing a current through it, it can emit light of various wavelengths.

OLED screens also have various characteristics of bending and flexibility. Curved TVs on the market and current mobile phones with curved screens all benefit from the characteristics of OLEDs. Although OLED has various advantages, it also has shortcomings, that is, the "flask" phenomenon is prone to appear when the same content is displayed on the screen for too long. (For example, if you watch CCTV1 for a long time, you will leave the logo), the dimming problem on the mobile phone also makes the strobe a heart disease of many users. However, OLED displays are far stronger than LCD TVs in terms of color contrast and portability. What about the price? Naturally, it is also a word: Expensive!

QLED

QLED is the abbreviation of Quantum Dot Light Emitting Diodes, which is a self-luminous technology that does not require additional light sources. Quantum Dots are extremely tiny semiconductor nanocrystals that are invisible to the naked eye. They are particles with a particle size of less than 10 nanometers. Quantum dots have a unique characteristic: whenever they are stimulated by light or electricity, they emit colored light. The color of the light is determined by the material and size of the quantum dot, and its frequency can be changed by changing the size of the quantum dot. , Shape and material to precisely adjust, so as to achieve a variety of applications.

The structure of QLED is very similar to OLED technology, the main difference is that the light-emitting center of QLED is composed of quantum dots. Its structure is that electrons and holes on both sides of the quantum dot layer converge to form photons (Exciton), and the photons emit light through the recombination of photons.

The future development direction is quantum display (QLED). Quantum display uses particles as small as nanometers to emit light, which is much stronger than OLED.

The Dragon Shadow series of AEVISION adopts QLED quantum dot display technology. The Dragon Shadow series models are a combination of commercial display and security monitor. One machine is multi-purpose. It is a splicing screen, a monitor, and a high-end commercial display screen. Using this technology, the color performance of the Dragon Shadow series can be described in three words: stable, accurate, and ruthless.

Stability is reflected in clear color gamut, no crosstalk, quasi-reflected in saturated color rendering, full of trueness, and vivid color, thick but not gorgeous.

Now that the Dragon Shadow series are on the market and are selling well, you are welcome to contact us at any time!