你有沒有想過為什麼膝上型電腦螢幕的尺寸會這麼奇怪？那你不是一個人！今天的超級使用者問答文章將探討在比較膝上型電腦時出現奇怪螢幕尺寸的原因。

今天的問答環節是由SuperUser提供的，SuperUser是Stack Exchange的一個分支，是一個由社群驅動的問答網站分組。

圖片由Jace Cooke（Flickr）提供。

問題

超級使用者讀者清潔者想知道為什麼膝上型電腦螢幕的尺寸如此奇怪：

We have been discussing this in the Comms Room on Serverfault, and thought it might make a good question on SuperUser…especially if there is a clear answer. The hope is that it is a Good Subjective question.

Why do laptop screen sizes come in the fractional sizes they do instead of 11/12/13/14/15″? The most frequent ones I see advertised are 11.6″, 12.5″, 13.3″, 14″, and 15.6″. What is the reasoning behind it? Keyboard size? Ergonomics? Resolution requirements? Most are LCD screens just like television sets, and yet televisi*** are advertised as whole numbers (19″, 26″, 46″, etc.).

Looking at actual LxWxD dimensi*** on laptops does not really help since screen bezels vary in size.

For instance, this example: 11.6″ laptop dimensi*** = 11.55″ x 8.50″ x 1.27″ — this is due to a rather large bezel.

Whereas my x1 carbon touch has a 14″ diagonal screen, but its dimensi*** are equal to a WQHD Touch: 13.03″ x 8.94″ x 0.55″ (Front), 0.79″ (Rear) — again bezel. If it could be edge to edge, that would be different, and “normal math” would insist the actual “monitor size” was about 15.5″, which it is if you include the bezel.

So:

Are there actual equati***/ratios/mathematical factors in determining screen sizes on a laptop that make certain sizes more common than others? Note that I stated screen size (like the common 11.6″, 13.3″, 15.6″, etc.) and not actual dimensi*** of the monitor lid itself.

To Help Clarify The Question:

I am asking why those particular fractional sizes are so common? Look at HP, Lenovo, and Dell. They all tend to go with those screen sizes. Is it because it is what the c***umers are used to seeing or using? Is it dictated by resolution requirements that ‘control’ the screen size (meaning 11.6″ works out resolution-wise, but 11.7″ does not)? Or is it something else? If you want to hone in on one: Something, somehow determined that 11.6″ was a good common screen size…I am curious what that was.

為什麼膝上型電腦螢幕的尺寸這麼奇怪？

答案

超級使用者貢獻者Adam Davis為我們提供了答案：

Display sizes are determined primarily by how many displays will fit on one mother glass slab at the manufacturing plant.

The manufacturing plant starts off with a single slab of glass on which the displays will be manufactured. Mother glass sizes are mostly standardized in the industry, and are increasing:

The larger a piece of mother glass is, the harder it is to work with due to breakage. However, throughput is counted by the number of working displays at the end of the line, and certain line processes take the same amount of time for a **all piece of glass as for a large one. So to increase throughput, increase the mother slab and put more displays on it.

It does not make sense to create a manufacturing line for a single size of display. It makes more sense to create a manufacturing line that handles the same size mother glass slab, and just change the number of displays created from the mother glass slab based on the order requirements.

Since the manufacturing line glass is not going to change in size, once you know the size of the display you want, you can determine how many of them can fit onto one mother slab. If there is additional space, it makes sense to increase the size until you are using as much space on the slab as possible, without going over your size requirement.

So the 10th generation glass will make one 150″ TV (which is only used at tradeshows simply to showcase the size of the mother glass a given factory can handle), or it will make nine 50″ TVs. The second generation glass was able to make a nice 24″ desktop display, or four 11.6″ displays.

A more in-depth treatment of this can be found at Norm’s Flat Panel. AUO has a nice interactive diagram that shows cutting patterns for a few sizes up to generation 8.5 glass. While I included 11th generation size, there are no plants currently operating at this size. It is expected the first such plants will open in 2015 or 2016, and they may use mother glass somewhere between 10th and 11th generation. Keep a watch for the next tradeshow as other manufacturers dem***trate 150″ TVs to show off their new 10th generation plants, and eventually 180″ TVs as the first 11th generation plants come online.

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