Front light, reflective type of display, and light controlling method
First Claim
1. A front light comprising:
- an optical waveguide having a first surface and a second surface facing the first surface; and
a point light source arranged to emit light into the optical waveguide,wherein a plurality of patterns comprising inclination surfaces for deflecting the light are provided on the first surface,wherein an angle formed by a direction connecting the point light source to an inclination surface of one of the patterns and a normal line of the inclination surface of the one of the patterns is selected depending on the direction connecting the point light source to the inclination surface of the one of the patterns, andwherein normal lines of the inclination surfaces of the patterns on a circumference centering around the point light source are converged on one point existing at a position different from that of the point light source when viewed from a direction vertical to the second surface of the optical waveguide.
1 Assignment
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Accused Products
Abstract
According to a front light comprising an optical waveguide 25 and a light source 24 arranged on the side of the optical waveguide 25, the optical waveguide 25 comprises a light input surface and light emission surface 28, and a plurality of deflection patterns 26 are formed on the surface opposed to the light emission surface 28. Light from the light source 24 is input from the light input surface of the optical waveguide 25 and propagated in the optical waveguide 25. The light totally reflected by the deflection patterns 26 among the light propagated in the optical waveguide 25 is emitted from the light emission surface 28 in the direction oblique to the normal direction of the light emission surface 28. The light is emitted from the light emission surface 28 so as to be aligned in one direction regardless of its position.
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Citations
17 Claims
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1. A front light comprising:
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an optical waveguide having a first surface and a second surface facing the first surface; and a point light source arranged to emit light into the optical waveguide, wherein a plurality of patterns comprising inclination surfaces for deflecting the light are provided on the first surface, wherein an angle formed by a direction connecting the point light source to an inclination surface of one of the patterns and a normal line of the inclination surface of the one of the patterns is selected depending on the direction connecting the point light source to the inclination surface of the one of the patterns, and wherein normal lines of the inclination surfaces of the patterns on a circumference centering around the point light source are converged on one point existing at a position different from that of the point light source when viewed from a direction vertical to the second surface of the optical waveguide. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A front light comprising:
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an optical waveguide having a first surface and a second surface facing the first surface; and a point light source arranged to emit light into the optical waveguide, wherein a plurality of patterns comprising inclination surfaces for deflecting the light are provided on the first surface, wherein an angle fonned by a direction connecting the point light source to an inclination surface of one of the patterns and a normal line of the inclination surface of the one of the patterns is selected depending on the direction connecting the point light source to the inclination surface of the one of the patterns, and wherein at least one of the patterns is arranged on a circumference of an ellipse, a focal point which coincides with the point light source, in such a manner that a longitudinal direction of the at least one of the patterns is substantially parallel to a tangential direction of the ellipse when viewed from a direction vertical to the second surface of the optical waveguide. - View Dependent Claims (9, 10, 11, 12)
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13. A front light comprising:
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an optical waveguide having a first surface and a second surface facing the first surface; and a point light source arranged to emit light into the optical waveguide, wherein a plurality of patterns comprising inclination surfaces for deflecting the light are provided on the first surface, wherein an angle formed by a direction connecting the point light source to an inclination surface of one of the patterns and a normal line of the inclination surface of the one of the patterns is selected depending on the direction connecting the point light source to the inclination surface of the one of the patterns, and wherein normal lines of the inclination surfaces of the patterns on a circumference centering around the point light source are converged on one point that does not coincide with the point light source, and wherein an angle formed by each of the normal lines and the first surface varies depending on a position of each of the patterns. - View Dependent Claims (14, 15, 16, 17)
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Specification