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The T2150CD series computers are equipped with either a color advanced STN Liquid
Crystal Display (LCD) or a color TFT LCD display.
This chapter explains functions of color displays, external monitors and the display controller.
Displaying Images
Images are formed on the display by dots called pixels. Each dot can be turned on to emit
light or turned off to appear dark. On the T2150CDS STN screen images are created by the
contrast of light and dark pixels and color filters. On the T2150CDT TFT screen images are
created by various intensities of red, green and blue subpixels.
Pixels are the smallest visual element on the screen. They are single points of light that
can be turned on or off.
T2150CDS: A pixel on an STN (Super Twisted Nematic) LCD is either light (on) or
dark (off). Color images are achieved by the use of color filters to generate and mix the
three primary additive colors: red, green and blue.
T2150CDT: The color TFT (Thin-Film Transistor) LCD uses transistors attached to
each pixel to turn precisely selected red, green and blue subpixels on or off and to adjust
their brightness, thereby providing a display with superior sharpness, precise color
definition and wide viewing angle.
Pels are the smallest visual elements that can be controlled by software. They may be
either one pixel or a group of pixels. The pel size determines the screen resolution (clarity
of detail): the larger the pel the lower the resolution.
Display Controller
Figure 8-1 Forming images with pixels and pels
Chapter 8
Display Panel
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