Before the Tang Dynasty, traditional window designs were mostly characterized by straight vertical mullions. During the Ming Dynasty, a new type of window called the "lying window" emerged and became more sophisticated. In the Song Dynasty, brick towers featured various types of straight mullion windows, while in the Ming Dynasty, some brick towers also included lying windows, which were widely used. These early forms can be considered the predecessors of modern blinds.
Windows have traditionally been made using either horizontal or vertical bars. The horizontal bar design is seen as the prototype of louvered windows. However, there's a subtle difference between lying windows and modern blinds. Lying windows are flat with transparent gaps, while blinds feature slanted slats that are not visible from above or below—only the slanted surfaces are noticeable. In ancient times, wooden windows were mainly used for ventilation and air circulation. Over time, these designs evolved into more advanced systems, leading to the development of modern blinds that are now widely used in buildings across the world.
Although the concept of adjustable window coverings has ancient roots, modern blinds as we know them today were invented by Americans. John Hampson was granted a patent for his invention on August 21, 1841. This marked the beginning of the modern blind industry.
Louvers, often referred to as louvered windows, differ from Venetian blinds. While Venetian blinds resemble curtains with small, adjustable slats that can be stacked together, louvers are typically wider and designed for shading and ventilation. You might recognize Venetian blinds from TV shows or your home, where they are commonly used for controlling light and privacy.
Louvers are often used both indoors and outdoors for their functional and aesthetic benefits. Today, many architects and designers consider the louver curtain wall to have evolved from traditional blinds. These curtain walls offer excellent ventilation, light control, and a sleek appearance, making them a popular choice in high-rise buildings and modern architecture.
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