EP-4700444-A3 - OPTICAL SHEET, BACKLIGHT UNIT, LIQUID CRYSTAL DISPLAY DEVICE, AND INFORMATION DEVICE
EP4700444A3EP 4700444 A3EP4700444 A3EP 4700444A3EP-4700444-A3
Abstract
An optical sheet 43 has at least one surface with unevenness. A total area of some of minute regions, which have surfaces inclined at inclination angles of 30° or more from an imaginary plane that is a flat surface appearing after imaginarily removing the unevenness, accounts for 30% or more of a total area of all the minute regions, for which the inclination angles are obtained by approximating the surfaces of the minute regions with the unevenness to flat surfaces, while two-dimensionally shifting the minute region with a predetermined projection area with respect to the imaginary plane at equal intervals along the imaginary plane to obtain the minute regions at respective points on the imaginary plane.
Inventors
- TSAI, CHENGHENG
- OKABE, MOTOHIKO
- TSUJI, TAKAHIRO
- SUKIGARA, MASAYUKI
Assignees
- KEIWA Incorporated
Dates
- Publication Date
- 20260513
- Application Date
- 20190906