INPUT TABLET AND LIQUID CRYSTAL DISPLAY DEVICE USING THE TABLET

摘要

PROBLEM TO BE SOLVED: To provide an easy-to-see and bright input tablet imparted with a two-dimensional illuminating function simple in structure by guiding light flux made incident from an end face to a light emitting plane and illuminating an object to be illuminated from the light emitting plane. ;SOLUTION: A light transmission body 11 is formed in the shape of rectangular plate as a whole, four end faces vertical to the surface of that plate are formed in the direction of plate surface orthogonal to the direction of plate thickness and the side faces of light transmission body 11 are formed from them. At the position facing one-side end face along with a short-side direction among these four end faces, a light source 2 composed of a linear light source such as a fluorescent lamp, for example, is arranged along with that end face 16. Both the surfaces of light transmission body 11 are formed as a light emitting plane 13 and a light reflecting plane 17. The light flux radiated from the light source 2 is made incident from the end face 16 to a light transmission plate 11 as shown by a light beam 19a or 19b, repeatedly fully reflected inside that plate later and emitted only from the side face 15 of projection 12. Therefore, there are a lot of beams emitted from the back of illuminator and an object 6 to be illuminated can effectively be illuminated.;COPYRIGHT: (C)1998,JPO