什么像素是什么及其对电视观看的含义

当您在电视或视频投影仪上观看自己喜欢的节目或电影时，您会看到看起来像是一系列完整的图像，例如照片或电影。但是，外表正在欺骗。

If you get your eyes close to a TV or projection screen, you'll see it is made up of little dots that are lined up in horizontal and vertical rows across and up and down the screen surface.

What Are Pixels?

The dots on a TV, video projection screen, PC monitor, laptop, or even tablet and smartphone screens, are referred to as像素。

A pixel is defined as a picture element. Each pixel contains red, green, and blue color information (referred to as subpixels). The following illustration shows a close-up of subpixels.

像素和分辨率

可以在屏幕表面上显示的像素的数量确定显示的图像的分辨率。为了显示特定的屏幕分辨率，必须水平和下下屏幕上的预定数量的像素垂直在屏幕上运行，并以行和列排列。

要确定覆盖整个屏幕表面的像素的总数，您可以将一行的水平像素数与一列中的垂直像素数相乘。这个总数称为像素密度。

以下是当今电视中常见分辨率的一些像素密度的示例（LCD, Plasma，，，，OLED）和视频投影仪（LCD，DLP）：

规定的分辨率	水平像素计数	Vertical Pixel Count	像素密度（显示总像素计数）
480i/p	720	480	345,600
720p	1,280	720	921,600
768p	1,366	768	1,049,088
1080i/p	1,920	1,080	2,073,600
4K（消费者标准）	3,840	2,160	8,294,400
4K（电影标准）	4,096	2,160	8,847,360
8k	7,680	4,320	33,177,600

像素密度和屏幕尺寸

In addition to pixel density (resolution), there is another factor to take into consideration: the size of the screen displaying the pixels.

Regardless of screen size, the horizontal/vertical pixel count and pixel density don't change for a specific resolution. If you have a 1080p TV, there are always 1,920 pixels running across the screen horizontally, per row, and 1,080 pixels running up and down the screen vertically, per column. This results in a pixel density of about 2.1 million.

Pixels per Inch

即使对所有屏幕尺寸的特定像素密度的像素的数量保持恒定，但变化的数量是每英寸像素。

随着屏幕尺寸变大，单独显示的像素必须更大，或者像素之间的空间增加，以便用正确的像素数量填充屏幕以进行特定分辨率。您可以计算特定分辨率/屏幕尺寸关系的每英寸像素数量。

电视与视频投影仪

和视频投影仪，对于特定投影仪，显示的像素每英寸可以根据所使用的尺寸屏幕而有所不同。与具有静态屏幕尺寸的电视（50英寸电视始终是50英寸电视）不同，视频投影仪可以显示各种屏幕尺寸的图像，具体取决于投影仪的镜头设计以及投影仪与投影仪的距离屏幕或墙。

TV and Video Projector Images – More Than Just Pixels

Although pixels are the foundation of how a TV image is put together, there are other things that are required to see good quality TV or video projector images.这些包括brightness, contrast, color, tint, color temperature, and other settings。

Just because a TV or projected image has a lot of pixels, doesn't automatically mean you'll see the best possible image.