The difference between LED/LED backlit display/OLED display

The LED, OLED, and LED backlighting screens make it difficult for many people to distinguish. At present, many manufacturers are stealing a concept when they promote their products. Obviously LED-backlit displays are simply referred to as LED displays. In fact, there is a fundamental difference between LED displays and current LED backlight displays. Of course, it is easy for readers to confuse the OLED technology is very advanced, then the LED, LED backlight, OLED what kind of difference between the three and what? The editor will introduce the basic concepts of these three technologies in this article.

What is LED display? LED display refers to a display that directly uses LEDs (light-emitting diodes) as pixel light-emitting elements. The light-emitting diodes that make up an array emit red, green, and blue light directly, thereby forming a color image. However, since the diameter of the light emitting diode itself is larger, the distance between pixels of the same color is also larger (that is, the dot pitch we often say), so the LED display is usually only suitable for large-screen display.

Interpretation of the differences between LED, LED backlight, and OLED display LED display application in the opening ceremony of Beijing Olympic Games LED display integrates microelectronic technology, computer technology, and information processing in one, with its colorful, dynamic range, high brightness, long life With the advantages of stable and reliable work, it has become the most dominant public display media. At present, LED displays have been widely used in large-scale squares, commercial advertisements, stadiums, information dissemination, press releases, securities transactions, etc., and can meet the needs of different environments.

What is a LED-backlit display? LED-backlit displays are just the backlight of a liquid crystal display that is overpowered by traditional CCFL cold-light tubes (similar to fluorescent lamps) to LEDs (light-emitting diodes). Let's review the basic principles of LCD.

The imaging principle of liquid crystals can be simply understood as follows: externally applying a voltage to deflect the liquid crystal molecules blocks the transparency of the light emitted by the backlight as a gate, and then projects the light into color filters of different colors to form an image.

Backlight module transition from CCFL to LED can bring many benefits, can make the display screen brightness more uniform, the product power consumption is lower, the appearance can be more light and thin fashion. However, W-LED (white LED) backlights are commonly used in the market. In fact, such backlights merely replace the light-emitting components, but the display effect is very weak or not even improved. The RGB-LED (tricolor LED), which has a significant improvement in the display effect of LCD products, has a significant improvement in the display effect, but at the same time, it has a higher production cost and is therefore applied to high-priced LCD TVs. At present, the LED display referred to by the merchant refers to a display product using a white LED backlight, and the difference from the ordinary liquid crystal display is the change of the backlight source.

What is OLED

Many friends are apt to confuse the next generation of display technology OLED and LED or LED backlight, the following editor will give you some basic knowledge of OLED. OLED is the abbreviation of English Organic Light-Emitting Diode, translated as organic light emitting diode or organic light emitting display. In fact, this light-emitting principle was discovered as early as 1936, but it was not until 1987 that Kodak introduced an OLED double-layer device. OLEDs have attracted attention as a flat panel display technology that can be commercialized and has excellent performance. At present, there are more than 100 research institutions and companies in the world investing in OLED R&D and production, including display giants such as Samsung, LG, Philips, and Sony. On the whole, the industrialization of OLED has begun. Monochromatic, multicolor and color devices have reached the level of mass production. Large-size full-color devices are still in the research and development stage.

Many netizens easily associate OLEDs with current LED backlights that are more popular with manufacturers. In fact, OLEDs and LED backlights are completely different display technologies. The OLED emits light by driving the organic thin film itself, and the emitted light may be monochromatic light such as red, green, blue, or white, which can also achieve full-color effects. So OLED is a new light-emitting principle that is different from CRT, LED and LCD technology.

OLED belongs to the carrier dual-injection type light emitting device, and the light emission mechanism is: under the drive of the external voltage, electrons and holes injected from the electrode are combined in the organic material to release energy, and the energy is transferred to the organic light-emitting material. Molecules, the latter being excited, transition from the ground state to the excited state. When the excited molecule returns to the ground state, the radiative transition produces a luminescence phenomenon. (Tips: What is a hole? An electrically neutral atom has the same number of positive protons and negative electrons. Now that there is a minus electron, there will be a positive charge there. This is a void.

to sum up:

In general, LEDs, LED backlights, and OLEDs are three completely different imaging technologies. The LED backlight displays or LCD TVs that are commonly seen in the market are actually not replacements of display technologies. They can only be said to be a replacement of originals. It is also incorrect to confuse LED backlighting with LEDs.