Technology October 25, 2021

[Learn Display] 30. Substrate

Display substrate refers to a material that forms the necessary basis for manufacturing in each display process, such as LCD and OLED. To compare the substrate to the construction process, it is similar to compacting a construction site in advance before groundwork is done. Most display substrates are made of glass, and have a very thin and flat shape of less than 1mm. Taking production efficiency into account, the large-sized substrate is put into the manufacturing process as it is. After passing through such a process, the fabricated substrate is cut into the appropriate size required for the final product. In case of LCDs, a glass substrate is used to build on a TFT (Thin Film Transistor) layer that controls liquid crystals and a color filter layer. Similar to the LCDs, OLEDs also use a glass substrate to fabricate TFT and the encapsulation glass to protect the self-emissive organic layer from contacting external air and moisture. While such ‘Rigid OLEDs’ use glass to produce substrate, ‘Flexible OLEDs’, which have lately been in the spotlight, utilize polyimide (PI) material for the…
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Technology October 18, 2021

[Learn Display] 29. Backlight Unit

Backlight Unit is one of the essential components of the LCDs. There are two types of Display: One is an emissive type that can be self-luminous, and the other is a non-emissive type operated utilizing an external light source. LCDs, unlike OLEDs, do not have an illuminant source, so they require the help of separate light to generate an image on the screen. In a nutshell, the backlight unit is the part that illuminates light evenly in the entire panel area for the display screen to be turned on. Backlight unit, also known as the acronym ‘BLU,’ is located on the very bottom side of an LCD panel. In the LCD structure, when the light comes out from the backlight unit, it passes through a liquid crystal and is tilted to the desired alignment to adjust the amount of light. Which color will be produced is determined after passing through a color filter composed of Red, Green, and Blue. For example, if the tilted liquid crystal completely blocks the passage of light, the display will show black color. However, if…
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Technology October 12, 2021

[Learn Display] 28. Color Filter

Color Filter is a thin layer to represent colors in LCDs. When the light from the backlight unit passes through liquid crystal and finally passes through a color filter composed of Red, Green, and Blue, the color of the light is changed according to which color filter it passed. It’s similar to light changing its color depending on the color of the cellophane when you expose a flashlight on cellophane. What if there’s no color filter in LCDs? It would be expressed by bright and dark gradations, like black and white TV. Most displays utilize a combination of three primary colors of light, Red(R), Green(G), and Blue(B), to represent various colors. Typically, one pixel has three sub-pixels of each color – R, G, and B – and more than a million colors can be reproduced through various combinations.
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Technology October 4, 2021

[Learn Dislay] 27. Polarizer

Polarizer is a thin film that allows only a certain orientation of light to pass through. Polarizer is designed to enable light with the same pattern and orientation to transmit and block ones with different orientation. The LCD adjusts the amount of light by utilizing liquid crystals placed between two polarizers. When light emitted from a backlight passes through the first polarizer, it is polarized to have a certain orientation. This light then goes through a liquid crystal to have variable angles of lights depending on the liquid crystal’s inclination. When the light passes through the second polarizer, it is either transmitted if it matches orientation of the polarizer or blocked if not. In this way, images are created on the screen. In the case of OLED that allows pixels light up individually, it doesn’t need the use of backlight unit and two polarizers. Instead, the polarizer, an opaque plastic sheet, is attached to displays to prevent the panel from reflecting external light. Since a traditional polarizer adds a dark layer of film on top of the panel, your device…
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Technology September 30, 2021

Samsung Galaxy Z Flip3 | “Show Us Your Cover Screen”

Decorating the cover screen of Galaxy Z Flip 3 has gone viral among Galaxy Z Flip users, and in case you need a dose of inspiration for customizing your own Galaxy Z Flip3 cover screen - check out some of our favorite cover screens by content creators around the world!
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Technology September 27, 2021

[Learn Display] 26. Liquid Crystal

Liquid Crystal, an essential material that composes LCDs, has properties of both fluidities of liquid and crystallinity of solid. Let’s figure out the role of liquid crystal in LCDs, the display technology that utilizes light transmission based on the modification of liquid crystal. As the name suggests, Liquid Crystal is a substance that blends the properties of liquid and crystalline solid states, serving as the essential materials of LCDs. Liquid Crystal was first discovered in 1854 and was named as ‘Liquid Crystal’ by Friedrich Reinitzer, an Austrian biologist, in 1888. Ever since liquid crystal was discovered, there has been a lot of research on modifying its state by applying electricity stimulation. After presenting the fact that liquid crystal exhibits unique optical properties in Nature in the 1960s, liquid crystal is widely used in a number of optical applications and finally commercialized. As mentioned earlier, the liquid crystal has optical properties that transmit light and property that reacts to electric current and modifies its alignment. Therefore, liquid crystal is used for passing through light or adjusting the amount of light. When…
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Technology September 15, 2021

Display Evolution Aimed Towards Perfection | History of Samsung’s Foldable OLED

Samsung’s foldable OLED smartphones has unfolded three generations with the latest being Galaxy Z Fold3 and Z Flip3! Since its first release in 2019, each generation of Galaxy Fold and Flip series has led significant strides in product innovation. Walk through each stages of Samsung’s foldable OLED history in this infographic.
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Technology September 13, 2021

[Learn Display] 25. Organic Layers (HIL, HTL, EML, ETL, EIL)

Organic layers in the structure of OLED display serve as a light emitter, consist of an emissive layer and ones that support light emission. The latter, supporting layers including Hole Injection Layer (HIL) and Hole Transport Layer (HTL) as well as Electron Injection Layer (EIL) and Electron Transport Layer (ETL), enable easier injection and transport of holes and electrons into Emissive Layer (EML). OLEDs are a type of display that emits light when electricity flows: Once electrons and holes are combined, it results in light emission. Electrons that migrate from the cathode and holes from the anode are transported into and combined in the Emission Material Layer (EML). To work this out, injection layers help electrons and holes quickly inject, while transport layers support fast transport of electrons and holes. With this configuration, the injection layers facilitate the injection of holes and electrons, while transport layers help them transport into the EML.  
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Technology September 10, 2021

[Interview] Behind the Scenes│Interview with Samsung Foldable OLED Developers

Samsung Electronics’ Galaxy Z Fold3, Galaxy Z Flip3 have been sweeping the industry with upbeat reviews, with the most eye-catching innovation being display upgrade. With ten years worth of hard work dedicated to this innovation, this article will cover the ‘behind the scenes’ stories of developers who carefully designed foldable into reality, with the latest third attempt being Galaxy Z Fold3.   Q1. What was the key objective for foldable panel development in 2021? <Sung-Un Park, Product Development PM>We wanted to highlight the best parts about foldable devices – which is still a fairly novel and unfamiliar technology to most people – by accentuating tangible innovations. Think of low-power technology, big screens, and enhanced user experience with S-Pen support!  Q2. Tangible innovation sounds fascinating. Why do you use that specific term? <Sung-Un Park, Product Development PM>To match public expectations of foldables, we focused on realizing display technologies that consumers could see and feel the difference themselves since display is one of the key elements that affect user satisfaction for smartphones.   Q3. Tell us more about low-power technology, one of the key…
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Technology September 7, 2021

New Technological Highlights Innovating Societies | Samsung Display Showcases Its Latest Technologies at IMID 2021

Korea’s biggest display exhibition, the International Meeting on Information Display (‘IMID 2021’), took place at Coex Convention & Exhibition Center on August 25, 2021.
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