LIGHT GUIDE PLATE, AND LIGHT SOURCE DEVICE AND DISPLAY DEVICE PROVIDED WITH THE SAME

摘要

PROBLEM TO BE SOLVED: To reduce the variance in luminance and to obtain a high contrast and a high display quality with respect to a display device used for a display part of a mobile electronic appliance or the like and a light source device and a light guide plate which are used for the display device.

SOLUTION: The light guide plate is provided with a light incidence surface 34 on which light is made incident from an LED 22, a light reflection surface 14 which is formed so as to face the light incidence surface 34 and reflects incident light from the light incidence surface 34, a light emission surface 16 which is arranged between the light incidence surface 34 and the light reflection surface 14 and has a circularly polarizing plate 20 closely stuck to the surface, a counter surface 17 which is formed so as to face the light emission surface 16 and where a first counter surface 18 for guiding the incident light to the light reflection surface 14 together with the light emission surface 16 and a second counter face for emitting reflected light on the light reflection surface 14 from the light emission surface 16 are alternately arranged.

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