Guangzhou

Guangzhou ( listen; Chinese: 广州, also known as Canton, and less commonly as Kwangchow), nicknamed the City of Flowers, is the capital and largest city of Guangdong province in South China. Guangzhou is one of the birthplaces of China's ancient "maritime Silk Road". Located on the Pearl River, about 120 km (75 mi) north-northwest of Hong Kong and 145 km (90 mi) north of Macau, Guangzhou serves as an important national transportation hub and trading port. One of the five National Central Cities, it holds sub-provincial administrative status.

Guangzhou is the third largest Chinese city and the largest city in South Central China. In 2014 the city's administrative area was estimated to have a population of 13,080,500. Some estimates place the population of the entire Pearl River Delta Mega City built-up area as high as 44 million including Guangzhou's nine urban districts, and Shenzhen (10.36 million), Dongguan (8.22 million), Zhongshan (3.12 million), most parts of Foshan (7.20 million), Jiangmen (1.82 million), Zhuhai (0.89 million) and Huyang County of Huizhou (0.76 million) adjoining Dongguan and Shenzhen, with an area of about 17,573 square kilometres (6,785 sq mi). Guangzhou is part of one of the most populous metropolitan agglomerations on Earth. The total population of this agglomeration is over 54 million, including the population of adjacent city Hong Kong. Guangzhou is identified as a Beta+ Global city. Due to rapidly increasing amount of foreigners and illegal immigrants from Middle East and Africa and Southeast Asia, it is called Capital of the Third World.

LED display

An LED display is a flat panel display, which uses an array of light-emitting diodes as pixels for a video display. Their brightness allows them to be used outdoors in store signs and billboards, and in recent years they have also become commonly used in destination signs on public transport vehicles. LED displays are capable of providing general illumination in addition to visual display, as when used for stage lighting or other decorative (as opposed to informational) purposes.

History

The first true all-LED flat panel television screen was possibly developed, demonstrated and documented by James P. Mitchell in 1977. The modular, scalable display was initially designed with hundreds of MV50 LEDs and a newly available transistor-transistor logic memory addressing circuit from Texas Instruments. The ¼-inch thin flat panel prototype and the scientific paper were displayed at the 29th ISEF expo in Washington D.C. in May 1978. It received awards by NASA and General Motors Corporation. A liquid crystal display (LCD) matrix design was also cited in the LED paper as an alternative x-y scan technology and as a future alternate television display method. Additional recognition was provided by Westinghouse Educational Foundation "Honors Group" and the concept prototype was also a selected scientific paper at the Iowa Academy of Science of the University of Northern Iowa. The replacement of the 70 year+ high-voltage analog system (cathode-ray tube technology) with a digital x-y scan system has been a significant achievement. Displacement of the electromagnetic scan systems included the removal of inductive deflection, electron beam and color convergence circuits. The digital x-y scan system has helped the modern television to “collapse” into its current thin form factor.

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China

China, officially the People's Republic of China (PRC), is a sovereign state in East Asia. It is the world's most populous country, with a population of over 1.35 billion. The PRC is a one-party state governed by the Communist Party, with its seat of government in the capital city of Beijing. It exercises jurisdiction over 22 provinces; five autonomous regions; four direct-controlled municipalities (Beijing, Tianjin, Shanghai and Chongqing); two mostly self-governing special administrative regions (Hong Kong and Macau); and claims sovereignty over Taiwan.

Covering approximately 9.6 million square kilometers, China is the world's second-largest country by land area, and either the third or fourth-largest by total area, depending on the method of measurement. China's landscape is vast and diverse, ranging from forest steppes and the Gobi and Taklamakan deserts in the arid north to subtropical forests in the wetter south. The Himalaya, Karakoram, Pamir and Tian Shan mountain ranges separate China from South and Central Asia. The Yangtze and Yellow Rivers, the third- and sixth-longest in the world, run from the Tibetan Plateau to the densely populated eastern seaboard. China's coastline along the Pacific Ocean is 14,500 kilometres (9,000 mi) long, and is bounded by the Bohai, Yellow, East and South China Seas.