Prism Sheet

A Prism Sheet, often referred to as a Brightness Enhancement Film (BEF), is a remarkable optical film that acts as a light recycler, significantly increasing the perceived brightness of a display without increasing its power consumption. The film's surface is covered with microscopic, precisely shaped prisms. After the light passes through the diffuser and becomes uniform, it then hits this prism sheet. The prismatic structure works by collimating the scattered light, meaning it gathers the light rays traveling at wide angles and redirects them forward, concentrating them in a narrower viewing cone directly in front of the display. Light that hits the prism facets at a steep angle is reflected back down into the backlight unit, where it is recycled and has another chance to be directed forward. This process can boost the on-axis brightness by 50% or more. Typically, two prism sheets are used, oriented at 90 degrees to each other, to collimate light on both the horizontal and vertical axes. By sourcing high-quality BEF from TECHWON, manufacturers can achieve a much brighter display for the same amount of power, leading to significant energy savings. This is particularly crucial for battery-powered devices like laptops and tablets. Alternatively, manufacturers can maintain a standard brightness level while using fewer LEDs or running them at a lower power, reducing both cost and heat output. Our prism sheets feature sharp, uniform prism structures that maximize brightness gain while minimizing optical defects.