Lcd Screen; Ambient Light Sensor - Fujitsu LIFEBOOK T904 Operating Manual

LCD screen

Notes LCDscreen
High-quality LCD screens (TFT) are installed in Fujitsu notebooks. For technical reasons,
these screens are manufactured for a specific resolution. An optimal, clear picture can
only be ensured in the resolution intended for the particular screen. A screen resolution
which differs from the specification can result in an unclear picture.
The resolution of the screen of your notebook is optimally set at the factory.
Current production technology cannot guarantee an absolutely fault-free screen display. A few
isolated constantly lit or unlit pixels (picture elements) may be present. The maximum permitted
number of such faulty pixels is specified in the international standard ISO 9241-307 (Class II).
Example:
A screen with a resolution of 1280 x 800 has 1280 x 800 = 1024000 pixels. Each pixel consists of
three subpixels (red, green and blue), so there are almost 3 million subpixels in total. According to ISO
9241-307 (class II), a maximum of 2 light and 2 dark pixels and in addition 5 light or 10 dark subpixels
or an equivalent mix (1 light subpixel counts as 2 dark subpixels) are allowed to be defective.
At a resolution of 1600 x 900 = 1440000 pixels, a maximum of 3 light and 3 dark pixels
and in addition 7 light or 14 dark subpixels are allowed to be defective.
Pixel
Subpixel
Cluster
Background lighting
LCD screens are operated with background lighting. The luminosity of the background
lighting can decrease during the period of use of the notebook. However, you can
set the brightness of your monitor individually.
Synchronizing the display on the LCD screen and an external monitor
For more information, please refer to Chapter
under "Switching between screen output".

Ambient light sensor

If your notebook was shipped with a Windows operating system, the screen brightness is
regulated by the ambient light sensor and is dependent on the particular light conditions.
This results in optimum readability and longer battery life at the same time.
Fujitsu
A pixel consists of 3 subpixels, normally red, green and
blue. A pixel is the smallest element that can be generated
by complete functionality of the display.
A subpixel is a separately addressable internal structure
within a pixel that enhances the pixel function.
A cluster contains two or more defective pixels or
subpixels in a 5 x 5 pixel block.
"Key combinations", Page 44
Working with the notebook
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