Technology November 29, 2021

[Learn Display] 34. Display Driver IC

There’re several steps to show an image on the screen. Display Driver IC is an indispensable semiconductor chip to operate each sub-pixels. DDI accepts a signal of an image from the CPU of the device and generates and controls the output signals. To put it simply, Display Driver IC commands the order to each sub-pixel on the panel how to operate. Display Driver IC is composed of Gate IC, Source IC, and etc. When a certain amount of electricity is applied to TFT depending on the voltage differences between Gate IC and Source IC, TFT works as a switch to turn on/off each sub-pixels. The color of the display varies upon the on/off operation of each sub-pixels and the display generates an expected image on the screen eventually.
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Technology November 23, 2021

[Learn Display] 33. Touch Screen Panel

Touch Screen Panel (TSP) refers to a device that identifies coordinates of the exact place when pressing or touching the display screen. Smartphones that we commonly use features touch screen panel, so we can pilot our smartphones by touching the screen without separate external buttons. The type of touch screen panels varies depending on how they work, such as capacitive touch, resistive touch, infrared ray touch, and acoustic wave touch. Early smartphones adopted a resistive which operates by the pressure applied. This method recognizes users’ touch when upper and lower substrates are in contact due to external pressure. As a result, this method comes with the disadvantage of a low touch recognition rate since it requires pressure hard enough to have films contact. Meanwhile, most of the latest smartphones use capacitive-type touch screen panels.  This method detects the change in capacitance of the electric conductor, such as a human hand, as soon as it touches the touch screen. Likewise, the capacitive type has good touch sensitivity and befits small and medium-sized models, so most mobile devices adopt it. Touch screen…
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Technology November 19, 2021

Display Under a Microscope: Diamond Pixel™

On average, we pick up our phones 58 times a day (the Guardian). Every time you look at your smartphone screen, have you ever wondered what it might look like under a microscope and why Samsung continues to innovate display technology on a sub-pixel level?
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Technology November 15, 2021

[Learn Display] 32. Window

‘Display Cover Window’, also known as a window, is a component that safeguards a display panel from the outer impact. The window should be transparent since the image screen generated by the display need to reach our vision even after covering up the screen for protection. These functions and characteristics resemble a window in a wall, so the cover window is also called ‘window’ in short.  The introduction of a screen touch function on smartphones removed most of the physical input devices such as keypads, which increased the size of a display. Windows also evolved in line with this trend, so existing plastic windows were replaced with glass material resistant to scratches even after a series of touches. Smartphone design innovation continued with the advance of glass processing technology. Glass windows evolved from flat glass plates (2D) to 2.5D windows featuring gently curved edges or 3D windows with curved edges like the Galaxy Edge series to create improved designs.     The very first foldable displays, unveiled in 2019, use not glass but flexible CPI (Colorless Polyimide) material for cover windows.…
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Technology November 12, 2021

Low Power, High Refresh Rate | The Latest Smartphone Trend: Adaptive Frequency

In the era of 5G, user need for low-power devices makes 'Adaptive Frequency' technology irreplaceable. Learn more about adaptive frequency and how it revolutionizes smartphones.
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Technology November 2, 2021

Efficiency ↑ Safety ↑ with RC Robots | Cleaning Robot Development at Samsung Display’s Production Line

"It’s exhilarating to watch the robot in action, knowing that we’ve realized innovations in improving worker safety and work hours." Meet Woohyun Jung and Gwangdon Park from Samsung Display’s Equipment Innovation Team!
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Technology November 1, 2021

[Learn Display] 31. Mother Glass & Generation

A substrate that serves as a foundation for display is essential to manufacture a display. ‘Mother Glass’ refers to a large piece of glass that lays the groundwork for display production. The mother glass is classified into different generations depending on their sizes.  Panels that constitute either OLEDs or LCDs are produced through several processes on top of a large block of mother glass. These panels that we are familiar with are not produced respectively, but once fabricated through manufacturing processes, and mother glasses are cut into smaller display sizes. As such, mother glass, which serves as the bottom layer for a panel, comes in different generations depending on the size of mother glass. Each generation of mother glass is not classified based on the universal standard, but manufacturers usually define similarly sized mother glass as the same generation of mother glass. In other words, the size of respective generations of mother glass may differ slightly by manufacturers. The latest mother glass generation is the largest, as the newer generations of mother glass are larger than older generations of mother…
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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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