The difference between LED/LED backlit display/OLED display

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 the difference between the three and what? The editor will introduce the basic concepts of these three technologies in this article.

What is LED display

An LED display refers to a display that directly uses an LED (Light Emitting Diode) as a pixel light emitting element, and an array of light emitting diodes directly emits light of three colors of red, green, and blue, thereby forming a color image. However, since the diameter of the light emitting diode itself is large, the distance between pixels of the same color is also large (that is, the dot pitch we often say), so the LED display is generally suitable only for large-screen display.

Interpretation of the differences between LED, LED backlight and OLED display LED display in the opening ceremony of Beijing Olympics

LED display integrates microelectronics technology, computer technology, and information processing into one, with its colorful, dynamic range, high brightness, long life, stable and reliable, and Other advantages, has become the most dominant public display media, at present, LED displays have been Widely used in large squares, commercial advertising, stadiums, information dissemination, press releases, securities trading, etc., can meet the needs of different environments.

What is a LED-backlit display

The LED backlight display is only the backlight of the liquid crystal display from the traditional CCFL cold light tube (similar to a fluorescent lamp) to the LED (light emitting diode). 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 a lot of benefits, can make the brightness of the display screen 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 not very strong or 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 can easily confuse the next-generation 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.

The OLED belongs to a carrier dual-injection type light emitting device. The light emission mechanism is as follows: driven by an external voltage, electrons and holes injected from an electrode are combined in an organic material to release energy and transfer energy to the organic light emitting material. Molecules, the latter being excited, transition from the ground state to the excited state, and 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 one negative 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.

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