Go homepage(回首页)
Upload pictures (上传图片)
Write articles (发文字帖)

The author:(作者)归海一刀
published in(发表于) 2014/5/3 9:07:03
Popular science： 2K， 1080P， and 720P effect of differences in the phone，

Popular science: 2K, 1080P, and 720P on the phone-the effect of differences between smart phones, resolution, 1080P,2k mobile phone-IT news Popular science: 2K, 1080P, and 720P effect of differences in the phone

Smart phone screen sizes and resolutions, has continued to improve: 720P in 2011, and universal, and 1080P into the mainstream last year began to emerge, this year will be raised to the 2K (Quad HD or 1440P) standards. In fact, including vivo, OPPO, domestic manufacturers have launched the 2K mobile phone, these data also showed LG G3 the 2K screen, is expected to once again brings a large influx of screen resolution upgrade.

From looking at the arguments, 2560*1440 total pixels of resolution is 1.7 times of 1920*1080 times, will provide users with more delicate text, pictures and clearer video effect. However, due to the human eye in certain viewing distance is actually the resolution limits, especially in the case of mobile phone screen size is limited. So, 2K whether the screen should become essential elements for your next cell phone, is it practical? A look at our analysis.

Screen size and resolution

First of all, let us start with the first "Retina retinal detachment" concept of Apple iPhone 4 says. The year Apple 960*640 was realized in a 3.5-inch screen resolution, screen pixel density of 326ppi, close to the recognition of the human eyeball resolution limit, it will be renamed the "Retina". Of course, this data along with changes in the size and resolution of the screen, we can refer to the pixel density of the popular smartphone data:

Apple iPhone 4-5s:326ppi

Samsung Galaxy S3 (4.8 inches, 720P): 306ppi

Samsung Galaxy S4 (5, 1080P): 441ppi

Samsung Galaxy Note 3 (5.7 inch, 1080P): 386ppi

In addition, according to Apple's statement of identify limit basic human eyeballs at 300PPI, Samsung S4 441ppi obviously has gone far beyond, which is why in the television industry, generally considered below the 55-inch 4K screen 1080P screen is virtually no viewing difference.

Another important factor: the viewing distance

Obviously, other factors associated with viewing the screen is viewing distance. Of course, everyone's vision in different, here we assume a normal twenty-twentieths Visual acuity (20 feet or 6 metres, you can see things in), using a model to demonstrate 480P to 2K screen for ideal viewing distance.

▲ 480P (4 ft 480*320 pixels) can be about 37.4 cm from the eye image details

▲ 720P (4.7 ft 1280*720 pixels) can be about 28 cm from the eye image details

▲ 1080P (5 ft 1920*1080 pixels), about 19.8 cm from the eye image details

▲ 2K (5.5-foot-2560*1440 pixels), at a distance of about 16.4 cm eyes image details

It is clear that nobody has posted a cell phone screen viewing, long-term use will feel very tired. In other words, use a 5.5-foot 2K, you need to be closer to the screen to see details such as text, icons, screen size if you increase, you can suitably increase the viewing distance.

Summary

Through test results may seem like 4K TV: 2K resolution in large size have applications on your phone, while in normal viewing distance, 5.5-6.4-inch and 5-inch Samsung S5 2K screen 1080P screen there is no difference.

This result is not so happy, seems 2K screen in limited sizes of mobile phone cases, still just a marketing advantage, rather than enhance the mobile experience focused. But one thing is for sure, hardware upgrading has faced a bottleneck period, manufacturers are going to grab all elements that can be used to carry out marketing, 2K is obviously an element on the screen. Currently run two 2K, differences and 1080P phone is small, and we look forward to the second half of the 2K display of mobile phones will bring some more obvious advantages, 2K screen is more practical significance

科普：2K、1080P和720P在手机上的效果区别 - 智能手机,分辨率,1080P,2k手机 - IT资讯
科普：2K、1080P和720P在手机上的效果区别

智能手机的屏幕尺寸和分辨率一直在不断提升：720P在2011年开始出现并普及、而去年1080P成为主流，今年则将提升到2K（Quad HD或1440P）标准。事实上，包括vivo、OPPO等国产厂商已经推出了2K手机，种种数据也显示LG G3将搭载2K屏，有望再一次带来大规模的手机屏幕分辨率升级潮。

从参数上来看，2560*1440分辨率的总像素数是1920*1080的1.7倍，将为用户带来更细腻的文字、图片和更清晰的视频效果。不过，由于人眼在一定的观看距离下实际上是有分辨极限的，尤其是在手机屏幕尺寸有限的情况下。那么，2K屏幕是否应该成为你下一款手机的必备元素、它又是否实用呢？一起来看看我们的分析吧。

屏幕大小和分辨率

首先，让我们先从首先提出“Retina视网膜”概念的苹果iPhone 4说起。由于当年苹果在3.5英寸的屏幕上实现了960*640分辨率，屏幕像素密度达到了326ppi，接近人类眼球分辨率的识别极限，所以将其命名为“Retina”。当然，这个数据是随着屏幕的尺寸和分辨率所变化的，我们可以参考一下流行手机的像素密度数据：

苹果iPhone 4-5s：326ppi

三星Galaxy S3（4.8英寸，720P）：306ppi

三星Galaxy S4（5英寸、1080P）：441ppi

三星Galaxy Note 3（5.7英寸，1080P）：386ppi

另外，如果按照苹果的说法，人类眼球的识别极限基本在300ppi左右，显然三星S4的441ppi已经远远超出，这也是为什么在电视行业，普遍认为55英寸以下的4K屏幕与1080P屏幕是几乎没有观赏差异的。

另一个重要因素：观看距离

显然，另一个与屏幕观看效果有关的因素是观看距离。当然，每个人的视力不同，在这里我们假定一个20/20的正常视力（在20英尺也就是6米内，可以看清事物），用模特来演示480P至2K屏幕的理想观看距离。

▲480P手机（4英尺480*320像素），可以在距离眼睛约37.4厘米处看清屏幕细节

▲720P手机（4.7英尺1280*720像素），可以在距离眼睛约28厘米处看清屏幕细节

▲1080P手机（5英尺1920*1080像素），可以在距离眼睛约19.8厘米处看清屏幕细节

▲2K手机（5.5英尺2560*1440像素），可以在距离眼睛约16.4厘米处看清屏幕细节

显然，没有人会一直贴着手机屏幕观看，长久使用会感觉到很疲劳。也就是说，使用5.5英尺的2K手机，你需要更贴近屏幕来看清文字、图标等细节，当然屏幕面积如果增大，则可以适当地增加观看距离。

总结

通过以上测试得出的结果似乎与4K电视一样：2K分辨率在大尺寸手机上更有用武之地，而在常规的观赏距离下，5.5-6.4英寸的2K屏幕和三星S5那样的5英寸1080P屏幕几乎没有差别。

这个结果的确不是令人那么开心，似乎2K屏幕在手机尺寸有限的情况下，依然只是营销上的优势，而不是提升手机使用体验的重点。但可以肯定的是，在手机硬件提升已经面临瓶颈期，厂商们会抓住一切可以利用的元素来进行营销，2K屏幕显然是一个元素。从目前国内两款2K手机的实际效果来看，差别与1080P手机不大，我们也期待下半年上市的2K手机们会带来一些更明显的显示优势，让2K屏幕更具实用意义

赞