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Color television
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Color television or colour television is a television transmission technology that includes color information for the picture, so the video image can be displayed in color on the television set. It improves on the monochrome or black-and-white television technology, which displays the image in shades of gray (grayscale). Television broadcasting stations and networks in most parts of the world upgraded from black-and-white to color transmission between the 1960s and the 1980s. The invention of color television standards was an important part of the history and technology of television.
A color television test at the Mount Kaukau transmitter site, New Zealand in 1970. A test pattern with color bars is used to calibrate the signal.
A color television test at the Mount Kaukau transmitter site, New Zealand in 1970. A test pattern with color bars is used to calibrate the signal.
Hovannes Adamian c. 1900s
Hovannes Adamian c. 1900s
This live image of actress Paddy Naismith was used to demonstrate Telechrome, John Logie Baird's first all-electronic color television system, which u
This live image of actress Paddy Naismith was used to demonstrate Telechrome, John Logie Baird's first all-electronic color television system, which used two projection CRTs. The two-color image would be similar to the basic Telechrome system.
RCA CT-100 at the SPARK Museum of Electrical Invention playing Superman. The RCA CT-100 was the first mass-produced color TV set.
RCA CT-100 at the SPARK Museum of Electrical Invention playing Superman. The RCA CT-100 was the first mass-produced color TV set.
Mechanical television
Videos
Mechanical television or mechanical scan television is an obsolete television system that relies on a mechanical scanning device, such as a rotating disk with holes in it or a rotating mirror drum, to scan the scene and generate the video signal, and a similar mechanical device at the receiver to display the picture. This contrasts with vacuum tube electronic television technology, using electron beam scanning methods, for example in cathode-ray tube (CRT) televisions. Subsequently, modern solid-state liquid-crystal displays (LCD) and LED displays are now used to create and display television pictures.
Watching a homemade mechanical-scan television receiver in 1928. The "televisor" (right) which produces the picture uses a spinning metal disk with a
Watching a homemade mechanical-scan television receiver in 1928. The "televisor" (right) which produces the picture uses a spinning metal disk with a series of holes in it, called a Nipkow disk, in front of a neon lamp. Each hole in the disk passing in front of the lamp produces a scan line which makes up the image. The video signal from the television receiver unit (left) is applied to the neon lamp, causing its brightness to vary with the brightness of the image at each point. This system produced a dim orange image 1.5 inches (3.8 cm) square, with 48 scan lines, at a frame rate of 7.5 frames per second.
Ernst Ruhmer demonstrating his experimental television system, which was capable of transmitting 5×5 pixel images of simple shapes over telephone line
Ernst Ruhmer demonstrating his experimental television system, which was capable of transmitting 5×5 pixel images of simple shapes over telephone lines, using a 25-element selenium cell receiver (1909)
Baird and his television receiver
Baird and his television receiver
Jenkins Television Co. rotating disk television camera, 1931
Jenkins Television Co. rotating disk television camera, 1931