Yue Xin, song Wenlong, tan Wei
(Harbin of northeast forestry university 150040)
Summary: The article introduces a kind of LED to show screen gets the new-style means of data. The digital signal that the imitate signal that this method uses the digitlization of high accuracy to handle a technology to show the computer to card is outputted changes into the standard conveys to display screen, implementation and computer synchronism show, solved the awkward condition that at present indication screen blocks with multimedia, rose to show the indication result of screen thereby, widened the applied domain of indication screen, achieve home to precede with the industry level, have fair applied value.
Keyword: LED shows; Modulus of VGA interface; changes
1 foreword
LED shows screen regards a kind of burgeoning indication as media, it is collect photoelectricity and computer technology the hi-tech product at an organic whole. Develop as the high speed of circuit of large scale integration and computer technology, got flying development, apply extensively already at all trades and professions.
Show in LED the system is medium, great majority is used undertake transmission, signal of processing, pilot is digital signal, and at present most computer and it is to pass join of imitate VGA interface between peripheral indication equipment, computer interior shows image information with what digital means generates, the imitate of ／ of number of D ／ A(in the card that be shown) converter change is primary colors of R, G, B3 signal of synchronism of signal and travel, field, signal transmits indication equipment through cable in. Show equipment to imitate, be like imitate CRT monitor, signal is sent corresponding processing circuit directly, drive controls picture tube to create image. And show equipment to the number such as LCD, DLP, need to configure ／ of corresponding imitate of A ／ D(in indication equipment number) converter, imitate signal change is digital signal.
Although show to in the market also very much number shows interface product, the digitlization that they have special computer screen to go up is red, green, blue 3 kinds base lubricious signal and the output interface that control signal, but these products are old much price is higher, return existence compatibility problem sometimes, and had not formed uniform standard.
So with respect to imitate interface character, indication screen obtains the method of data to basically have two kinds: It is to pass the LED that manufacturer offers to show screen is special firstly multimedia video clip collects data, implementation LED shows the synchronism of screen and computer shows; It is the imitate signal that outputs through intercepting and capture indication card secondly will get data, implementation LED shows the synchronism of screen and computer shows. These two kinds of technologies had had shape in the real work that the product uses at LED to display screen.
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