Cheil Industries Inc.

Young Soo Han

Seok Hoon Jang

Jun Hyeak Choi

Man Suk Kim

Ju Yeol Choi

Kyu Ha Chung

A prism sheet, capable of enhancing wet-out ability in a whole back light unit while maintaining center brightness, transmittance and haze in good condition, is disclosed. The prism sheet includes a base film made of a transparent material and having a flat first surface, and a light refracting part including a plurality of unit prisms unitarily formed with the base film on a second surface of the base film, opposite to the flat first surface. The unit prisms have a predetermined shape of a cross section, and are arranged with orientation. When an angle formed between a ridge of the unit prism of the light refracting part and a normal line of the flat first surface is defined as &#x3b8;, &#x3b8;and &#x3b8;have different values from each other, and n is an integer more than 2. An LCD back light unit using the above prism sheet is also disclosed.

Prism sheet having wet-out property and LCD back light unit thereby

A prism sheet includes a transparent base film with first and second surfaces and an optical refracting part with a plurality of prism units on the second surface, wherein the prism units are integral with the transparent base film, each prism unit having a predetermined height and extending along a first direction on the second surface of the transparent base film, wherein each prism unit includes a ridge extending along the first direction, a distance along a normal between the second surface of the transparent base film and the ridge defining the predetermined height of the prism unit, and wherein at least two prism units include ridges inclined at a predetermined angle other than zero with respect to the second surface of the transparent base film, the inclined ridges being unevenly distributed on the second surface of the transparent base film.

Growing community of inventors

Uiwang-si, South Korea

Young Soo Han