Since the advent of mobile phone QR codes in 2002, QR codes have become more and more widely used in life, especially in the past two years. Because QR codes are very convenient to generate, they are used as carriers of identity recognition and information transfer. Become a popular.
Scanning the QR code at the bus station, various business information will appear; the subway sells QR code paper towels, and you can scan to get the local tourist map; even some people print their WeChat account QR codes on their clothes. Two-dimensional codes have also become an indispensable part of many commercial promotion, and LED display is a commonly used light box advertisement. Its display technology is not satisfactory in displaying complex two-dimensional codes. Display technology presents various challenges.
With the development and application of LED Display (LED Display, hereinafter referred to as LED display) technology, the demand for whether it can completely present digital content in various applications has increased. Taking the LED display of commercial advertising as an example, business owners have always been the most troubled business owners how to make full use of the short advertising period of about 30 seconds to present more information to the customers who come and go and successfully attract their attention. Using consumer mobile phones, combined with QuickResponseCode (QRCode, hereinafter referred to as QR code), undoubtedly provides a very good consumer experience, but this application also further improves the technical threshold of LED display .
After the 1970s, the emergence of point-of-sale information systems (Pointfsale, POS) and bar codes (Barcode) solved the problem that traditional retailers do not have a good tool to count the sales and inventory of goods, and also made Barcode (Barcode) popular. , But new problems also follow. The problem is that the capacity of the barcode (Barcode) is limited. The English number represented by the barcode (Barcode) itself can only hold up to 20 characters. The demand for "Code (code) as long as it can contain more information" is increasing.
In 1994, DENSOWAVEINCORPORATED published the QR code. The name QR code is derived from the Quick Response Matrix Code (QuickResponseCode, QRCode, hereinafter referred to as QR code), also known as 2D Barcode (2DBarcode). The QR code can accommodate a large capacity of about 7000 English digits and can be processed by Chinese characters , And the reading speed is more than 10 times faster than other codes.
In 2002, mobile phones with QR code reading function began to market. This kind of graphics, which contains a lot of information, attracts people. By reading, you can easily visit mobile phone websites or obtain various discounts. Popular in society. According to Forrester Research, Inc., an independent research institute, on average, 15% of consumers in the United States, Britain, France, and Germany are already using mobile phones to scan QR codes, and the proportion continues to grow.
The QR code can only be read when the QR code is clear and in compliance with the standard. This can be displayed on the LCD (Liquid Crystal Display, LCD) in e-mail, Internet, etc. There will be no problems. When applied to applications such as magazine printing, product packaging boxes, business cards, etc., the QR code provides error correction function in response to the above applications becoming dirty and damaged, etc., and can correct up to about 30% to ensure that it can be determined. Read.
However, as the basic working principle of the above-mentioned LED display line scanning, when the QR code is applied to the LED display, the following error conditions are prone to occur and cannot be read.
1. When the efficiency of the LED display is not good enough to achieve a high refresh rate (indoor LED display: refresh rate> 500Hz / outdoor LED display: refresh rate> 1000Hz), the three positioning patterns cannot be fully presented, which is not effective Positioning.
2. When the performance of the LED display is not good, high gray scale (> 14bit) cannot be achieved, and when it is reduced or enlarged without a matching video processor, it will easily cause deformation of each code module (Codemodule), although the appearance is different from the ordinary two. The dimension code is the same, but in fact it is difficult to read, and sometimes it can't be read.
The two-dimensional code wants to be displayed clearly on the LED display and allows people to scan it. It still takes time. I believe that with the continuous development of LED display technology, this problem will be solved one day, let us look forward to it.
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