ScreenTek is proud to provide you this glossary of common terms in the laptop LCD screen industry, and in the laptop notebook industry. Feel free to become more familiar with the terms we use throughout our site. If you notice any glaring omissions, we'd be glad to hear about those. Drop us a line at sales@screentekinc.com.

D, E, F Terms » 7 definitions

DBEF

(Dual Brightness Enhancement Film) A 3M product that increases LCD screen brightness. The film recycles most of the light that is normally lost in the rear polarizer.

(more Surface terms)

Dead pixel

An occurrence when the pixel of an LCD screen shorts and remains permanently open or closed. There are two occurrences which define a dead pixel: a "lit" pixel, which appears as a randomly placed white, red, blue and/or green dot on a dark background or a "missing" pixel which appears as a black dot on light-colored background. LCD makers and laptop manufacturers have limits to how many dead pixels are allowed on a screen before they'll accept it back for a refund or exchange. For examples of various dead pixel policies, see our Quality Standards page. One simple way of determining if you have a dead pixel on your screen is to try one of many available dead pixel tests found online.

(more Quality terms)

Diffuse reflection

A reflection from a rough or matte surface which creates a beam of scattered light, with no directional dependence. In the image at right, the green lines represent the image and the light blue lines represent the reflected image.

(more Optics terms)

Diffuser

Translucent material used for light diffusion placed between backlight lighting sources and the back side of an LCD.

(more Hardware terms)

Double Super Twist Nematic (DSTN)

A type of LCD screen that uses less power and are less expensive to manufacture than thin-film transistor (TFT) screens. DSTN screens usually produce lower image quality and have slower response time than TFT displays.

(more Hardware terms)

Frame rate

The number of frames or images that are projected or displayed per second.

(more Image terms)

Frequency

The measurement of the amount of times a repeated event takes place, per unit time.

(more Hardware terms)

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