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US006606139B2
(12) United States Patent ao) Patent No.: us 6,606,139 B2
Yoshii et al. (45) Date of Patent: Aug. 12,2003
(54) LIQUID CRYSTAL DISPLAY DEVICE WITH
IMPROVED VIEWING ANGLE PROPERTY
AND PORTABLE ELECTRONIC APPARATUS
USING THE SAME
(75) Inventors: Katsumasa Yoshii, Fukushima-ken
(JP); Tatsuya Moriike, Fukushima-ken
(JP); Mitsuru Kano, Fukushima-ken
(JP)
(73) Assignee: Alps Electric Co., Ltd., Tokyo (JP)
( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 10/126,940
(22) Filed: Apr. 18, 2002
(65) Prior Publication Data
US 2003/0011730 Al Jan. 16, 2003 (30) Foreign Application Priority Data
Apr. 19, 2001 (JP) 2001-121206
(51) Int. CI.7 G02F 1/1335
(52) U.S. CI 349/114; 349/113; 349/117;
349/96
(58) Field of Search 349/113, 114,
349/117, 96, 99, 121, 187
A liquid crystal display device includes a reflector disposed at an outside surface side ol one substrate ol a liquid crystal cell or between the first substrate and an electrode disposed on an inside surface side ol the first substrate. When an angle between a direction ol a normal line with respect to a display surface ol the liquid crystal display device and a main viewing direction is from about 0 degrees to about 20 degrees, a reflection ratio peak value ol light incident upon the liquid crystal display device and reflected by the reflector is set so as to occur within a range ol about 20 degrees from the normal line direction.
29 Claims, 10 Drawing Sheets
