What is 4K? What is Ultra HD?

It’s simple, 4K means a clearer picture. It's more pixels (8,294,400 pixels) on the screen at once that creates images that are crisper and capable of showing more details than standard HD. Ultra High Definition is actually a derivation of the 4K digital cinema standard. However while your local multiplex shows images in native 4096 x 2160 4K resolution, the new Ultra HD consumer format has a slightly lower resolution of 3840 X 2160 which is what you get on the 16:9 ratio TVs you actually take home. This is one reason why some brands prefer not to use the 4K label at all, sticking with Ultra HD or UHD instead. What is the resolution of 4K? 4K resolution is 3840 x 2160 or 2160p.  A full HD 1080p image is only a 1920x1080 resolution.  4K screens have about 8 million pixels, which is around four times what your current 1080p set can display. A full HD 1080p image is 1080 rows high and 1920 columns wide.  A 4K image approximately doubles the numbers in both directions, making it approximately four times as many pixels total.   4K, also called 4K resolution, refers to a horizontal screen display resolution in the order of 4,000 pixels.  There are several different 4K resolutions in the fields of digital television and digital cinematography.  In television and consumer media, 4K UHD or UHD-1 is the dominant 4K standard. In the movie projection industry, Digital Cinema Initiatives (DCI 4K) is the dominant 4K standard. There are three main 4K resolution standards: UHD-1, or ultra-high-definition television (UHDTV), is the 4K standard for television and computer monitors. Resolution of 3840 × 2160 (16:9, or approximately a 1.78:1 aspect ratio);  UHD-1 is used in consumer television and other media, e.g. video games. UW4K is the ultra-wide 4K standard, with a resolution of 3840 × 1600, and an aspect ratio of 12:5 (2.4:1, or 21.6:9) This resolution is most commonly used on Ultra HD Blu-ray discs, and PC gaming monitors. DCI 4K which has a resolution of 4096 × 2160 pixels (256:135, approximately a 1.9:1 aspect ratio). This standard is only used in the film and video production industry.  The DCI 4K standard has twice the horizontal and twice the vertical resolution of DCI 2K. *Source from Wikipedia. Why is it called 4K? Because the images are around 4,000 pixels wide.  Yes, the industry named 1080 resolution after image height, but named 4K after image width.  To make it more confusing, you also might hear this resolution referred to as 2160p.  Like it’s not confusing enough?  They just make it more confusing.  Why do we need so many pixels? More pixels means more information. More information means sharper pictures. Sharper pictures are more engaging. More engaging content is more interesting.  We just get more picky with what we see nowadays. I'll see a huge difference? Maybe not as much of a thrill as you did when you upgraded your old CRT to a flatscreen, but 4K screens are noticeably sharper than 1080p screens.  Going from a 480 to a 1080p set, you’ll feel the difference;  display size is more powerful than any resolution jump could ever hope to be. Most people got big jumps in both screen size and resolution.  But this time screen sizes are staying about the same, with the most popular models falling in the 40 inch to 70 inch range. Most importantly, you'll only be able to see the resolution difference on a 4K set if you're watching 4K content and you're sitting close enough. What is this 8K? It's the next resolution standard up from 4K. Basically it doubles the pixel height and width again to yield approximately 32 million pixels.  An 8K display would also be UHD. 8K UHD, or 8K resolution, is the current highest ultra high definition television (UHDTV) resolution in digital television and digital cinematography.  8K refers to the horizontal resolution of 7,680 pixels, forming the total image dimensions of (7680×4320), otherwise known as 4320p. *source www.techradar.com updated 2018/04/01

How many different types of USB are there?

As technology keeps advancing, and the demand of small devices increases, manufactures are forced to come up with smaller and smaller but faster USB standards to fit the devices.  It can be confusing, but let us show you the different types of USB that we can find in the market today. Below are the different types of USB:    updated 2018/04/01

What is the difference between all the USB 2.0, 3.0, and 3.1 out there?

Let us explain to you in very simple words as technology keeps defining new heights. USB  2.0 operates at a max. of 480Mbps transfer data called “high speed” and it only has 4 pins.  Generally defined in black color connector. USB 3.0 operates at max. speed of 5Gbps transfer data rate called “super speed” and uses a blue connector to differentiate from USB 2.0 and has more pins.     USB 3.1 Gen 1 is the same as USB 3.0.  USB 3.0 got a new name when the new speed USB 3.1 Gen 2 was released.  USB 3.1 Gen 2 data transfers up to 10Gbps, at 100W of charging power also known as “charger and cable clutter” is defined with a red connector.   USB is always backward compatible until the new USB-C where you may have to buy a new converter.    *source www.usb.org   updated 2018/04/01

What is USB PD (Power Delivery)?

USB Power Delivery is a charging protocol that enables USB-C cables and connectors to deliver higher levels of power to your devices.  Provides faster charging, more power for larger devices, shorter charging time, and charge simultaneously between devices.  It enables the maximum functionality of USB by providing more flexible power delivery along with data over a single cable.  USB Power Delivery offers the following features: Increased power levels from existing USB standards up to 100W. Power direction is no longer fixed. This enables the product with the power (Host or Peripheral) to provide the power. Optimize power management across multiple peripherals by allowing each device to take only the power it requires, and to get more power when required for a given application. Intelligent and flexible system level management of power via optional hub communication with the PC. Allows low power cases such as headsets to negotiate for only the power they require. *source www.usb.org updated 2018/02/01

What is QC?

Quick Charge (a.k.a. QC) is a technology found in Qualcomm Snapdragon systems-on-chip, used in devices such as smartphones and computers, for managing power delivered over USB. It offers more power and thus charges batteries in devices faster than standard USB rates allow. Using certain Snapdragon-powered devices with a QC certified power adapter and any USB connector, including Type-C, you can refill the battery faster than with a conventional charging.  At allows for high levels of current to flow to the batter, in an attempt to maximize it’s charging efficiency.  It tends to charge their batteries at higher voltages, allowing for a higher rate of power transfer through commonly found cables.  Both the phone and the charger must be compatible with the same charging voltages and currents.  QC 2.0 supported 4 modes at varying power levels 5V/2A, 9V/2A, 12V/1.67A, and a 20V option. QC 3.0 communicates with the device to request any voltage between 3.2V ad 20V at 200mV increments, allowing for a wider selection of voltages. Below you’ll see a chart with the different types of QC for your reference.   *source www.qualcomm.com *source wikipedia updated 2018/04/03

What is RGB Color Space? What is Chroma Subsampling? 4:4:4 vs 4:2:2 vs 4:2:0

The RGB color space is the color space used by computers, graphics cards and monitors or LCDs.  It consists of three components, red, green and blue, the so-called base (or Primary) colors. 4:4:4 is another name for RGB color space and it’s a digital image or video in which all color components have the same sampling rate, thus not using chroma subsampling.  This scheme is sometimes used in high-end film scanners and cinematic post production.  Chroma subsampling is a type of compression that reduces the color information in a signal in favor of luminance data. This reduces bandwidth without significantly affecting picture quality. A video signal is split into two different aspects: luminance information and color information. Luminance, or luma for short, defines most of the picture since contrast is what forms the shapes that you see on the screen. For example, a black and white image will not look less detailed than a color picture. Color information, chrominance or simply chroma is important as well but has less visual impact. What chroma subsampling does is reduce the amount of color information in the signal to allow more luminance data instead. This allows you to maintain picture clarity while effectively reducing the file size up to 50%.  In the YUV format, luma is only 1/3rd of the signal, so reducing the amount of chroma data helps a lot. Because of bandwidth limitations from internet speeds and HDMI, this makes for much more efficient use of current systems. 4:4:4 vs 4:2:2 vs 4:2:0 The first number (in this case 4), refers to the size of the sample. The two following numbers both refer to chroma. They are both relative to the first number and define the horizontal and vertical sampling respectively. A signal with chroma 4:4:4 has no compression (so it is not subsampled) and transports both luminance and color data entirely.  In a four by two array of pixels, 4:2:2 has half the chroma of 4:4:4, and 4:2:0 has a quarter of the color information available. The 4:2:2 signal will have half the sampling rate horizontally, but will maintain full sampling vertically. 4:2:0, on the other hand, will only sample colors out of half the pixels on the first row and ignores the second row of the sample completely. Color subsampling is a method of compression that greatly reduces file size and bandwidth requirements with practically no quality loss. Unless you are going to use your TV as a primary PC monitor where lots of text is going to be read, there shouldn't be a need to worry about it.  In simple, the higher the number, the better it is.   You’ll see it most visible impact in the following devices.   *source www.rtings.com updated 2018/04/02