The first iPhone with a Retina Display

  What is “Retina Display”? It offers more pixels than the human eye can see. The iPhone 4 was the first iPhone which was equipped with a Retina Display with a pixel density of 326 PPI. Actually, this technical terms stands for high-resolution screen technology on various models of the iPhone, iPod touch and other Apple products. Why do Apple products obtain this name? Because it claims that screens made with the technology are so sharp and high quality that it’s impossible for the human eye to distinguish individual pixels. The iPhone 4 utilized this new advanced technology first. The benefits of this technology are visible in many uses, but especially for displaying text, where curved front edges are substantially smoother than on previous display technologies. This LCD screen digitizer is marvelous.


There is no single screen resolution that makes something a Retina Display. For instance, you can’t say that every device with a resolution of 960 x 640 (like the iPhone 4) has a Retina Display. Instead, there are two factors that create a Retina Display screen: pixel density and the distance from which the screen is normally viewed.

Pixel Density refers to how tightly-packed the screen’s pixels are. The greater the density, the smoother the images. Pixel density is measured in pixels per inch, or PPI, which indicates how many pixels are in one square inch of screen. This is based on a combination of the device’s resolution and its physical size. The iPhone 4 had 326 PPI thanks to a 3.5-inch screen with a 960 x 640 resolution. This was the original PPI for Retina Display screens, though that changed as later models were released. For instance, the iPad Air 2 has a 2048 x 1536 pixel screen, resulting in 264 PPI. That, too, is a Retina Display screen. This is where the second factor comes in.

Viewing Distance refers to how far away users generally hold the device from their faces. For example, the iPhone is generally held fairly close to the user’s face, while a MacBook Pro is generally held farther away. This matters because the defining characteristic of a Retina Display is that the pixels can’t be seen by a human eye. Something that’s seen from much closer up needs a greater pixel density for the eye not to see the pixels. Pixel density can be lower for things seen at a greater distance.


Although it is the first-adopter, it is also one of the most problematic smart devices in Apple realm. If your iPhone 4 met the dead pixel, you need to find the proper solutions to deal with it. Take into account that each pixel is formed by a red, a green and a blue sub-pixel. Sometimes, one or couple of pixels will act defective or function poorly. This can be divided into two situations. That are the dead or stuck screen. Bu how to differentiate them? I’ll explain to you in this article.


Before we learn how to solve defective pixels on an iPhone, iPad or any other similar device, we have to exactly identify the problem. Most of us are aware of the dead pixel concept. In fact, we’re often confusing the terms dead and defective pixels. A dead picture element is black and doesn’t light up at all. This is why it can’t be noticed when the iPhone’s screen displays a dark background and can only be spotted when it contrasts with a white or bright colored wallpaper. Stuck pixels are screen elements that freeze in either the red, green or blue state provided by indicated by the sub-pixel. These pixels light up, but they can’t change the required colors. Stuck pixels are easier to fix. Dead ones might never light up again.


Fortunately, these problems can be resolved by a reputable third-party retailer. They not only offer you a high-premium screen replacement but also give you a set of a tool in order to meet your DIY demands. If you are a DIY enthusiast, it is absolutely your first priority. In addition, if you have any problems, we will give you the kind customer service as well as cash back warranty. If your iPhone 4 was broken or cracked, although this chance is slim, you’d better choose a retailer for your iPhone 4 LCD screen digitizer. We offer you the Grade O LCD screen to you whether you screen encounters display problems, dead pixels, cracked LCD screen and wrong color issues.