Prism Sheet

Mitsubishi Rayon Co., Ltd. has begun full-scale mass production of DIAART Y-Type prism sheets, which have a 30% higher luminance that conventional sheets used for high luminance LCD displays.


1. Product background

LCD displays are used in the manufacture of a variety of data devices, including notebook and desktop computer monitors, mobile phones, car navigation systems, TVs, and game consoles. Most LCDs, with the exception of some reflection type LCDs, are lit uniformly by the use of a separate light source, or backlight, built into the unit behind the panel. There are two types of backlights – a direct backlight type where the light source is located behind the diffusion sheet, and an edge-lit type where the light source is located along the edge of the light guide panel.

Small-scale LCD displays, such as those used in mobile data devices and notebook computers with monitors under 18 inches, are usually of the more compact edge-lit type. Edge-lit type LCD displays use prism sheets to attain uniform brightness, and until this time, manufacturers had to use two prism sheets that faced in different directions.

Now, with the DIAART Y-Type prism sheet, manufacturers need only one prism sheet to both achieve uniform display brightness and enhance display brightness by 30 percent. Mitsubishi Rayon has begun full-scale mass production of the new prism sheet, which has been hailed by LCD makers everywhere. The current annual production capacity stands at 12 million sheets.


2. DIAART Y-Type specifications

Mitsubishi Rayon has optimized the prism sheet for high luminance LCD displays on a nanoscale through the use of technology involving the precise molding of acrylic resins, to produce the DIAART Y-Type prism sheet, which enhances the light-concentrating efficiency of the sheet. Since this new product necessitates the use of only one prism sheet, it has also served to enhance the luminance of LCDs and make them both thinner and lighter.

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