1. LIGHT PEN
Ayesha Mahboob

2. Definition
 An input device that utilizes a light-
sensitive detector to select objects on a
display screen.
 wired to a video terminal used to draw
pictures or select menu options.

3. History
The handmade
prototype of a "light gun"
in 1952 was part of the
Whirlwind Project at MIT.

4. Classification
 A light pen is a computer input device
 a light-sensitive pen used in conjunction
with a computer's TV set or monitor.
 It allows the user to point to displayed
objects, or draw on the screen

5. Uses
 Can be used on a computer screen, TV
screen and a smart board.

6. Construction
 It includes a light that is detected by the
pixels on the screen.
 It has a photoreceptor for sensing the
signal

7. Manufacture
 The light pen includes a body, a driving
pulse generating module and a light
generating module
 The body has a pen shape, and an end of
the body includes an opening through
which light exits.

8. Operation
 light pen you can move the pointer and
select objects on the display screen by
directly pointing to the objects with the
pen.
 A light pen is similar to a mouse

9. Maintenance and fault finding
 a small invention
 being easily damaged is a disadvantage.
 short lifespan.
 too much light can confuse the sensor,
cause it to operate erratically.

10. Thank you