How the computer connects the TV with the HDMI

　　Why do you use the HDMI cable to connect the computer to the TV?

Because now the LCD TV basically has a VGA interface, so you can easily use the VGA cable to achieve the computer connected to the TV, but there is a place in the article is not mentioned, that is the resolution of the problem, now the mainstream LCD TV panel is already full HD panel (1920X1080), but unfortunately, A lot of TV (especially some domestic TV) on the VGA interface is still stuck in the standard five or six years ago, can only support the 640x480,800x600,1024x768 of these several commonly used low-end display resolution, can not support 1920x1080, so that your full HD LCD panel Can not play the best level! (The following image is Haier's 52-inch LCD TV Lu52t1 of the instructions screenshot, which is the PC interface is VGA interface, only support the highest 1024x768 resolution, so if you want this TV show 1080P screen, you can only use its HDMI interface for computer-connected TV)

However, do not support 1920x1080 this resolution is not the worst, after all, 1024x768 resolution has been quite clear, and the word is relatively large, the key problem is that if the use of 1024x768, the screen is 4:3, and the TV is 16:9, so you will see the picture is squashed, Feel very bad, as shown in the following figure, the left side is 4:3 percentage of 1024x768, the right side is a 16:9 ratio of 1280x720.

　　How to use the HDMI cable to realize computer connected TV

First of all, you need to have a support HDMI input TV, a video card with HDMI output of the computer, if the computer without HDMI output, DVI output can also, but need to use a DVI to the HDMI adapter.

Second, you need a suitable length of the HDMI line, here we recommend not to use more than 10 meters of HDMI line, regardless of those selling line of the manufacturers how to cheat you, because a pure HDMI line (no special circuit enhancements) more than 10 meters, It is difficult to guarantee that you can continue to support 1920X1080 such a high resolution, and a 10 meters above the HDMI line price is not cheap, if not up to 1080P (1920X1080), what is the significance of it?

And finally, it's wired, it's simple, only one HDMI line, plug the computer graphics card HDMI output, one end of the HDMI input TV, the realization of the computer connected to the TV, the computer's voice and image can be sent to the TV, we will focus on the computer connected to the TV, the use of some of the problems easily encountered.

　　Problems that are easily encountered in use

　　First, the display resolution setting

Carefully read the TV instructions (or a screenshot of the above Haier TV instructions), you will find that the TV HDMI port support resolution and VGA, DVI port support the resolution is completely different, the marking method is not the same (is 720p,1080i,1080p), yes, this is the standard HDMI, Standard HDMI signals do not support the usual resolution of these displays like 1024x768,1440x900,1680x1050, so if you do not set the resolution of your computer's graphics output to the format supported by the HDMI port, the TV may be black. This is a lot of friends often make a low-level mistake. As for what is 720p,1080i,1080p, it is very simple, basically equivalent to the graphics resolution of the 1280x720 @60hz,1920x1080 @30hz staggered, 1920X1080 @60hz.

　　Second, why not the voice?

Many friends use the HDMI line to do the computer connected to the TV, there is no sound on the TV, but the HDMI line itself is to support sound audio transmission, this is why? This phenomenon is mainly caused by several reasons:

1, HDMI video card does not have built-in sound card, this is seen in Nvidia chipset graphics card, with this graphics card, you need to put the motherboard sound card SPDIF output and graphics card SPDIF input (the general graphics card will provide this wire, there will be wiring diagram), otherwise, HDMI video card without audio input, The HDMI signal naturally does not have an audio signal, as shown in the following two pictures:

　　SPDIF input position diagram of video card

　　SPDIF output location diagram of the motherboard (Blue 11 Callout place)

2, if you are using DVI switch HDMI line to do computer connection TV, you will also need a separate audio line, from the computer's audio output to the TV audio input (HDMI channel external audio input interface, some TVs do not have this interface, you can not use this way to achieve computer connection TV, You may need to change an HDMI video card.