| CPC G02B 6/0036 (2013.01) [A63F 7/022 (2013.01); G02B 6/0068 (2013.01); G02B 6/0038 (2013.01); G02B 6/006 (2013.01)] | 6 Claims |
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1. A display device, comprising:
a light guide plate formed in a sheet shape by a transparent member, the light guide plate is capable of displaying at least one pattern, and having an incident surface defined on a lateral surface; and
a plurality of light sources facing the incident surface and provided along a longitudinal direction of the incident surface;
wherein the plurality of light sources comprise at least a first light source, a second light source, and a third light source having light emission colors different from each other,
the light guide plate comprises a plurality of prisms formed on one surface of the light guide plate and arranged along the pattern, and the plurality of prisms are configured to emit light from any of the plurality of light sources entering the light guide plate from the incident surface at another surface of the light guide plate,
the pattern is configured by a combination of a plurality of minimum display units, and each minimum display unit among the plurality of minimum display units includes a first prism and a second prism adjacent to the first prism formed on the one surface of the light guide plate and arranged along the pattern,
the first prism has a first reflective surface formed in a curved surface shape that is convex with respect to the incident surface along the one surface,
the second prism has a second reflective surface formed in a curved surface shape that is convex with respect to the incident surface along the one surface,
a first light quantity of a first light is defined as an amount of light of the first light source that is reflected by the first reflective surface of the first prism towards a predetermined direction, a second light quantity of a second light is defined as an amount of light of the second light source that is reflected by the first reflective surface of the first prism towards the predetermined direction, the first prism is disposed such that a ratio between the first light quantity and the second light quantity is a first ratio,
a third light quantity of a third light is defined as an amount of light of the second light source that is reflected by the second reflective surface of the second prism towards the predetermined direction, a fourth light quantity of a fourth light is defined as an amount of light of the third light source that is reflected by the second reflective surface of the second prism towards the predetermined direction, the second prism is disposed such that a ratio between the second light quantity and the third light quantity is a second ratio, and
the first ratio and the second ratio are set such that each minimum display unit among the plurality of minimum display units of the pattern is displayed in a respective predetermined display color by the first prism and the second prism of each minimum display unit,
wherein the first prism and the second prism are defined such that, among the minimum display units, a minimum display unit farther away from the incident surface has a smaller curvature of the reflective surface of the first prism and a smaller curvature of the reflective surface of the second prism included in that minimum display unit.
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