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ThinkLight was a keyboard light present on many older ThinkPad families of notebook computers. The series was originally designed by IBM, and then developed and produced by Lenovo since 2005. The ThinkLight has been replaced by a backlight keyboard on later generations of ThinkPads, and Lenovo has discontinued the ThinkLight in 2013. [1]
The wide variation in luminance degradation with RGB-based organic light-emitting diode (OLED) [5] will cause noticeable color drift over time (where one of the red-green-blue colors becomes more prominent). OLEDs do not need a backlight to light up; each pixel is a self-illuminating LED. The pixels on OLEDs inevitably lose their brightness ...
As of 2008, Lenovo has announced LED-backlit notebooks. In October 2008, Apple announced that it would be using LED backlights for all of its notebooks and new 24-inch Apple Cinema Display , and one year later it introduced a new LED iMac , meaning all of Apple's new computer screens became LED-backlit displays.
An LED-backlit LCD is a liquid-crystal display that uses LEDs for backlighting instead of traditional cold cathode fluorescent (CCFL) backlighting. [1] LED-backlit displays use the same TFT LCD (thin-film-transistor liquid-crystal display) technologies as CCFL-backlit LCDs, but offer a variety of advantages over them.
One test for whether the computer has crashed is pressing the caps lock key. The keyboard sends the key code to the keyboard driver running in the main computer; if the main computer is operating, it commands the light to turn on. All the other indicator lights work in a similar way.
The LCD panel is synchronized with the backlight. For example, to make a segment appear red, the segment is only turned ON when the backlight is red, and to make a segment appear magenta, the segment is turned ON when the backlight is blue, and it continues to be ON while the backlight becomes red, and it turns OFF when the backlight becomes green.
In Microsoft Windows, there are keyboard layouts, such as Swiss German, whose keys generate unrelated, non-uppercase symbols when pressed before ⇧ Shift. [9], creating a 5th level (and a 6th level when ⇪ Caps Lock is on and ⇧ Shift is pressed) for typing symbols on a single key. Below is an example using the Swiss German keyboard layout ...
Virtual keyboards are commonly used as an on-screen input method in devices with no physical keyboard where there is no room for one, such as a pocket computer, personal digital assistant (PDA), tablet computer, or touchscreen-equipped mobile phone. Text is commonly inputted either by tapping a virtual keyboard or finger-tracing. [10]