Review on Engineering Designs for Laboratory Chemical Devices and Displays

Abstract

An engineering design of a screen for laboratory and chemical instrumentation. A liquid crystal display (LCD display) is a flat screen or other electronically modified optical device that uses the light modulating properties of liquid crystals combined with polarizers. LCD screens are accessible to display random images (as in a general purpose computer monitor) or still images with low information content, which can be displayed or unseen, such as words and numbers and displays seven parts such as the word of a digital clock. LCDs can be either on positive or off negative depending on the arrangement of the polarizer. For example a positive backlit LCD will have black characters on the backlight being the color of the backlight and a negative character LCD will have a black background with the characters being the same color as the backlight. Optical filters have been added to the white on blue LCD screens to give them their distinctive look.