Materials and tasks for presentations

15. Your computer screen.

Read and discuss the information about computer screen. Prepare a PPT presentation.

COMPUTER SCREEN AND HOW SCREEN DISPAYS WORK.

GO GREEN.

Monitors

Without a display or monitor... What is the point?

The computer monitor connects to the graphics card and it displays a picture on the screen.

Computer monitors come in different types:

— CRT (Cathode Ray Tube) which are block monitors.

— LCD (Liquid Crystal Display) which are very thin.

— LEDs (Light Emitting Diodes)

— Touch screen monitors are now also available.

How does it work & display

* liquid crystal displays work by the tiny pixels on the screen showing more than 20.000,000 colours an LCD screen is a multilayered, sideways sandwich.

* A fluorescent light source, known as the backlight. This light passes through the first of two polarising filters.

• The polarised light then passes through a layer that contains thousands of liquid crystal pixels arrayed in tiny containers called cells. The cells are. In turn, arrayed in rows across the screen; one or more cells make up one pixel.

• Electric leads around the edge of the ICO create an electric field that twrsts the crystal molecule, which lines the light up with the second polarising filter and allows it to pass through it-

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