Chapter 8
Display Panel
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.
Figure 8-1 Forming images with pixels and pels
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
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.
