![]() ![]() Quantum dot on glass (QDOG) replaces QD film with a thin QD layer coated on top of the light-guide plate (LGP), reducing costs and improving efficiency. At the CES 2017, Samsung rebranded their 'SUHD' TVs as 'QLED' later in April 2017, Samsung formed the QLED Alliance with Hisense and TCL to produce and market QD-enhanced TVs. At the Consumer Electronics Show 2015, Samsung Electronics, LG Electronics, TCL Corporation and Sony showed QD-enhanced LED-backlighting of LCD TVs. The first manufacturer shipping TVs of this kind was Sony in 2013 as Triluminos, Sony's trademark for the technology. Light from a blue LED backlight is converted by QDs to relatively pure red and green, so that this combination of blue, green and red light incurs less blue-green crosstalk and light absorption in the color filters after the LCD screen, thereby increasing useful light throughput and providing a better color gamut. Quantum dot enhancement layer Ī widespread practical application is using quantum dot enhancement film (QDEF) layer to improve the LED backlighting in LCD TVs. ![]() Quantum dots naturally produce monochromatic light, so they are more efficient than white light sources when color filtered and allow more saturated colors that reach nearly 100% of Rec. QDs are either photo-emissive ( photoluminescent) or electro-emissive ( electroluminescent) allowing them to be readily incorporated into new emissive display architectures. Starting in the early 2000s, scientists started to realize the potential of developing quantum dots for light sources and displays. Early applications included imaging using QD infrared photodetectors, light emitting diodes and single-color light emitting devices. The idea of using quantum dots as a light source emerged in the 1990s. QD-OLED and QD-LED displays can achieve the same contrast as OLED/MicroLED displays with "perfect" black levels in the off state, unlike LED-backlit LCDs. Quantum dot displays are capable of displaying wider color gamuts, with some devices approaching full coverage of the BT.2020 color gamut. Īs of June 2016, all commercial products, such as LCD TVs branded as QLED, employ quantum dots as photo-emissive particles electro-emissive QD-LED TVs exist in laboratories only. Manufacturers asserted that QD-LED displays could support large, flexible displays and would not degrade as readily as OLEDs, making them good candidates for flat-panel TV screens, digital cameras, mobile phones and handheld game consoles. These displays are similar to active-matrix organic light-emitting diode (AMOLED) and MicroLED displays, in that light would be produced directly in each pixel by applying electric current to inorganic nano-particles. LED-backlit LCDs are the main application of photo-emissive quantum dots, though blue OLED panels with QD color filters are being researched.Įlectro-emissive or electroluminiscent quantum dot displays are an experimental type of display based on quantum-dot light-emitting diodes (QD-LED also EL-QLED, ELQD, QDEL). Although the QD color filter technology is primarily used in LED-backlit LCDs, it is applicable to other display technologies which use color filters, such as blue/UV AMOLED/ QNED/ MicroLED display panels. Light travels through QD layer film and traditional RGB filters made from color pigments, or through QD filters with red/green QD color converters and blue passthrough. Quantum dots are excited by the blue light from the display panel to emit pure basic colors, which reduces light losses and color crosstalk in color filters, improving display brightness and color gamut. Photo-emissive quantum dot particles are used in LCD backlights and/or display color filters. ![]() Different sized quantum dots emit different color light due to quantum confinement.Ī quantum dot display is a display device that uses quantum dots (QD), semiconductor nanocrystals which can produce pure monochromatic red, green, and blue light. Colloidal quantum dots irradiated with a UV light. ![]()
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