Retina display, retina Display

Retina display, retina Display

Direct Translation of Retina is the meaning of Retina.
IT was proposed by Apple.
It means that the pixel density of a display is as high as that of humans.
To learn details, you must first understand the basic knowledge.
Inch 1 inch = 2.52
The inch of the mobile phone is calculated by the diagonal line (the length from the upper left to the lower right corner) of the screen.
Ppi = pixel per inch is the number of pixels in 1 inch, which can also be viewed as density.
The higher the ppi, the better.
Impact of Retina screen on web
On the Retina screen, the photo will increase based on the window. devicePixelRatio of the device.
For example, a PX photo is taken on a mobile phone with devicePixelRatio = 2.
It will be 600px! The photo will be magnified by a factor of 1, which will lead off!
To cater to the Retina mobile phone, we must have a PX photo and a PX photo.
Srcset = "123_big.jpg 2x"
To automatically determine which image to display.

What are the advantages and disadvantages of the Retina screen?

Insufficient Retina screen

Apple's Retina screen is definitely an amazing selling point. People are not only amazed at its high resolution, but also excited for its increased color saturation. The first Apple device to use the Retina screen is the iPhone 4, with a screen size of 326ppi per foot. However, the calculation method for determining whether the screen of the new iPad is Retina is different from that of the iPhone 4, because the distance between the screen and the eyes when people hold the iPad is different from that when they hold the iPhone.

But in terms of Retina standards, scientists are more rigorous. Apple's self-claimed Retina screen is actually only 20/20 Vision, which is a standard Vision, but many people have better Vision than 20/20 Vision. The best visual Vision is 20/10 Vision, if it is placed at a distance of 12 inch, the pixel density can reach 573ppi. If it is placed outside 15 feet, the pixel density can reach 458ppi. Therefore, the iPhone 4's 326ppi screen has only 20/20 Vision standards at most, but 20/20 Vision cannot be called "Retina" scientifically ". It can only be said that advertising and scientific facts are often inconsistent. There are still deficiencies in these aspects:

Screen reflection
Even in moderate light, a typical large screen reflection will make reading difficult, requiring higher brightness and power consumption. The supplier can use an anti-reflective coating on the screen.

Light source sensor
The front light sensor is used to sense the brightness of your face, rather than the brightness of the surrounding environment. As a result, automatic brightness adjustment is not particularly accurate.

Automatic brightness adjustment
We have tested so many tablets and smartphones that the automatic brightness adjustment function is very poor.

RGBLED Backlight
The use of red, green, and blue LEDs alone, rather than only white LEDs, is conducive to more accurate calibration, and the color saturation of the image will also increase

IPS screen or RETINA screen

As you know, the most popular iPhone 4 is the ips (plane conversion) screen, which is also known as "hard screen". The LCD molecules of ips are arranged in a plane with a large viewing angle, ips has the advantages of high contrast, fast response, and power-saving. The retina technology compresses the number of display units per unit area by significantly compressing the pixels. Therefore, the screen using the retina technology looks comfortable and clear. The screen of iPhone 4 and itouc4uses the retina technology, so the display is very delicate. Thank you!