Roman Shades

A window blind or door blind is a covering for a window or door, usually attached to the interior side of a window. Blinds hide from sight (thus "blinding" a viewer of the window) or to reduce sunlight. more...

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It screens the window and is made of a series of long pieces of a material or is raised by a roller. They include awnings, shutters, Venetian blinds, shades and other brise-soleil.

The window blinds can be grouped as shutter-like and shade-like and are an old technology. Drawings in ancient Egyptian tombs of reed blinds have been reported and a common window blind during the 1800’s is said to have been the home-made roller shade.

Window blinds have varying thermal effects: they can block unwanted heat of the summer sun and they can keep in heat in cold weather. But in both of these applications, they also reduce light to varying degrees, depending on the design. Many kinds of blinds attempt varying balances of privacy and shade.

Some blinds can also be automated through motors. Some motorised door blinds are transpassables (one can cross them). Motorized shades can be controlled from a wall switch or keypad, remote control, or a personal computer. This eliminates the hazard of dangling cords.

Another type of window blind, which is effective in light blocking, is the Duette blind. It can be used in any type of room as it is custom made. The fabric used is polyester fabric. It helps control the room temperature. It can be custom made to different pleat sizes.

Shutter-like

Slats

Slat blinds, which consist of many horizontal slats, usually of metal or vinyl, connected with string in a way that they can be rotated to allow light to pass between the slats, rotated up to about 170 degrees to hide the light, or pulled up so that the entire window is clear

Sometimes the slats will be bowed. Although it would appear logical to turn the slats closed by flipping the nearest edge down, the best way to close the slats would be to turn them inside edge up. This way, outsiders will not be able to peek in through the window as effectively; they will only be able to see the ceiling. By turning them down improperly, an outsider will likely be able to see a good deal of detail- from the waist level down to the floor.

The blinds can be tilted by rotating a small knob that is attached to the strings or twisting a long wand or by pulling a cord; the raising and lowering of the blinds is achieved by pulling a different strings.There also exists a version with a winding mechanisms that combine both functions into one winding rod and can be used for motorisation.

Read more at Wikipedia.org