Since 2002, the emergence of mobile phone qr code and qr code in the application of life more and more widely, especially in the past two years, because of qr code generation is very convenient, as the identity and the carrier of information transmission, qr code has become a popular.

      Bus stop flicking a qr code various merchants information will appear; Sweep out the subway qr code of tissues, can obtain the local tourist map; Even someone will own micro letter account qr code printed on clothes. Qr code has become an indispensable part of a lot of business promotion, and LED display as a commonly used one kind of advertisements, it display technology on shows that the effect of the complex qr code are not so good, qr code put forward challenges to LED display technology.

As light emitting diode display LEDDisplay, hereinafter referred to as the LED display technology development and 

application of popularization, whether it can in a variety of applications to complete the requirements of the digital content will increase. In commercial advertising LED display, for example, business owners about how to fully use of about 30 seconds short advertising slots, present more information to consumers, and successfully attract their eyes, was the most troubled business owners. Consumers of mobile phone, combined with fast response matrix code (QuickResponseCode QRCode, hereinafter referred to as the qr code), undoubtedly provides a fairly good consumer experience, the application, however, also further improve the threshold of LED display technology.

Ordering information system in the 1970 s, after sales (Pointfsale, POS) and the emergence of bar code (Barcode), to solve the traditional retailers without a good tool, can statistical goods sales and inventory problems, also make the bar code (Barcode) has gained popularity, but also pose new questions. The problem is the bar code (Barcode) capacity is limited, bar code (Barcode) itself on behalf of the English the best digital can accommodate 20 words. "Code (Code) itself, if only can contain more information" demand, and grows.
In 1994, DENSOWAVEINCORPORATED publicly the qr code. Qr code name from this fast response matrix code (QuickResponseCode QRCode, hereinafter referred to as the qr code), also known as 2 d barcodes (2 dbarcode), qr code can accommodate about 7000 English Numbers of large capacity, can be processing of Chinese characters, and read more than 10 times faster than other coding.
In 2002, which has the function of qr code read phones on market, this contains a lot of information graphics, attracting people, through reading can easily visit mobile website, or get all sorts of preferential, so qr code quickly spread in society. ForresterResearch according to independent research institutions, Inc., surveys, on average in the United States, Britain, France, Germany, 15% of consumers are already using mobile scanning qr code, and still continues to grow.
Qr code in the qr code display clear and accord with a standard can be read to ensure predictable, only do this in the electronic mail (E-mail), Internet (Website) and so on can be displayed through the LCD screen (LiquidCrystalDisplay, LCD), there is no problem. And in a variety of applications such as magazine printing, outer-package of product applications, business CARDS, and so on, in order to cope with the qr code application become dirty, damaged, etc., to provide the function of error correction, error up to about 30%, to ensure that can be predictable reads.
However, as the basic working principle of LED display line scan qr code used in LED display, is easy to appear the following error, and can't read.
1, in the LED display poor performance to achieve high refresh rate (indoor LED display: 500 hz refresh rate > / outdoor LED display: refresh rate > 1000 hz), three positioning design can not complete, and therefore cannot be effective positioning.

2, when the LED display poor performance to achieve high gray-scale (> 14 bit), and in the absence of collocation is

 to reduce or enlarge the video processor, easy to cause each element (Codemodule) deformation, while the appearance like ordinary qr code, but in fact it is difficult to read, and sometimes can't read.

Qr code want to clear display in LED display and can make people scan will take time, also believe that with the continuous development of LED display technology, one day will be solve this problem, and let us to wait.

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