What is the name of the screen-like wall set up at the entrance to the courtyard in ancient times?

It is called shadow wall. Shadow wall, also known as the wall of illumination, the ancient name of the Xiao wall, is China, the Korean Peninsula, Vietnam, the traditional architecture of the wall used to block the line of sight. The function of a screen is similar to that of a shadow wall, which is directly referred to as a screen (屏風, ヒンプン) in the Ryukyu language.

Shadow walls can be located either inside or outside the main gate; the former is called an inner shadow wall, and the latter is called an outer shadow wall. The shape has a zigzag, octagonal, etc. It is usually made of brick and consists of three parts: the seat, the body, and the top, and the seat has a sukiyaki seat.

The center of the wall is called the heart of the wall, the heart of the wall of the Chinese and Vietnamese shadow wall is usually made of square bricks placed at an angle of 45 degrees and pasted into the wall, the simpler shadow wall may not have any decorations, but it must also be grinding bricks to the seams are very neat, the luxury of the shadow wall is usually adorned with a lot of brick carvings of auspicious patterns.

Expanded:

Nine Dragons Wall is a kind of glazed shadow wall decorated with nine big dragons, mostly used by Ming and Qing royalty. China's existing ancient glazed nine-dragon wall has four:

1, Datong nine-dragon wall, located in Datong city, is the largest, the longest history of one. Originally for the Ming Emperor Zhu Yuanzhang thirteenth son of Zhu Gui's royal residence in front of the wall.

2, Shanxi Pingyao Nine Dragons Wall, in Pingyao ancient city of Pingyao Temple, built in the early Ming Dynasty, was originally the Prince Temple wall. It was destroyed in the Cultural Revolution and later restored.

3, Beihai Nine Dragons Wall, located in Beijing Beihai Park, built in the twenty-first year of the Qing Dynasty (1756), both sides are carved with nine dragons, was originally the shadow wall in front of the Da Xitian scripture factory.

4, the Palace of the Nine Dragons, located in the Forbidden City, Beijing, Ning Shoumen in front of the shadow wall, built in Qianlong 38 (1773).