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The flicker of a CRT monitor can cause various symptoms in those sensitive to it such as eye strain, headaches [9] in migraine sufferers, and seizures in epileptics. [10]As the flicker is most clearly seen at the edge of our vision there is no obvious risk in using a CRT, but prolonged use can cause a sort of retinal shock where the flickering is seen even when looking away from the monitor.
In January 2013 Lenovo announced the ThinkVision LT1423p, a mobile touchscreen display designed for use with Microsoft's Windows 8 operating system. The LT1423p is a 13.3-inch AH-IPS display with 1600x900 resolution. The face of the device is Gorilla Glass in order to make it more durable. Pen-based and multitouch finger-based input are both ...
However, this does not apply to LCD monitors. The closest equivalent to a refresh rate on an LCD monitor is its frame rate, which is often locked at 60 fps. But this is rarely a problem, because the only part of an LCD monitor that could produce CRT-like flicker—its backlight—typically operates at around a minimum of 200 Hz.
Image persistence can occur as easily as having something remain unchanged on the screen in the same location for a duration of even 10 minutes, such as a web page or document. Minor cases of image persistence are generally only visible when looking at darker areas on the screen, and usually invisible to the eye during ordinary computer use.
As of 2012, most implementations of LCD backlighting use pulse-width modulation (PWM) to dim the display, [159] which makes the screen flicker more acutely (this does not mean visibly) than a CRT monitor at 85 Hz refresh rate would (this is because the entire screen is strobing on and off rather than a CRT's phosphor sustained dot which ...
In fact, early generations of computer displays were frequently related to eye strains and headache due to flickering, jitter and radiation. [2] [3] [4] In 1986, TCO published a basic list of requirements and test protocols to verify if a display was fit for continuous daily use as a help for employers to choose the right hardware for work ...
If the frequency of the pulse-width modulation is too low or the user is very sensitive to flicker, this may cause discomfort and eye-strain, similar to the flicker of CRT displays. [27] [28] This can be tested by a user simply by waving a hand or object in front of the screen. If the object appears to have sharply defined edges as it moves ...
The silicon layer for TFT-LCDs is typically deposited using the PECVD process. [11] Transistors take up only a small fraction of the area of each pixel and the rest of the silicon film is etched away to allow light to easily pass through it. Polycrystalline silicon is sometimes used in displays that require higher TFT performance. Examples ...