A man is using an Electric Light Pen |
Electric Light Pen:
1.
An electric light
pen is an input device.
2.
The first light
pen was invented by Ben Gurley in 1959.
3.
The basic idea for
the computer mouse came to Douglas Engelbart in 1961,
while he was attending a computer graphics conference.
4.
It is used as a pointing
device.
5.
It is easy to use.
Can directly draw on screen.
6.
Light pen is a
light-sensitive shaped like a pen.
7.
The light pen can be a very focused flashlight-type of
device or a laser pointer.
8.
It is attached to
same video display terminal.
9.
The cursor on the
screen is controlled the tip of the pen with the screen.
10.
Light pen gives the
user full range of mouse capabilities without the use of a horizontal surface.
11.
Commonly used to select or otherwise modify
text or data on a screen.
12.
In the 1960s, they became more commonly used with
graphics terminals, like the IBM 2250.
13.
In the 1980s, light pen usage expanded to home
computers, like the BBC Micro computer.
14.
Light pen offers
more active and accurate interaction with the computer.
15.
In specially
designed display screen, data can be entered with a light pen or
existing data can be modified.
16.
A light pen may also be used to describe the
pen (stylus) used with a graphics tablet.
17.
A light pen is not very accurate while drawing.
18.
It is very expansive compare to other pointing
devices.
19.
Today,
light pens are no longer used due to the invention of touch screens.
20.
Some common types of light pen are given below:
i.
Corded light pens,
ii.
Battery light pens,
iii.
Led light pens etc.
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