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Flat light source and passive display utilizing bypass light guide
| Details |
Inventors: Iimura, Keiji;
Assignee:
Primary Examiner: O'Shea; Sandra
Assistant Examiner: Honeyman; Marshall
Attorney, Agent or Firm:
A flat light source i.e. a surface light source and a passive display using the same are disclosed, capable of making optimal light leakage with uniform brightness across the entire area of its large flat surface. The flat light source comprises a first light transmission means for illumination with relatively high refractive index, a second light transmission means for bypass light guide including at least one light guide having relatively high refractive index and a light coupling means making light coupling between the both first and light transmission means for changing direction of light rays, wherein the light rays output from the second light transmission means are changed in direction in order to input into the first light transmission means. A plurality of optical fibers may be used as the light-guides for light bypassing, in which they are aligned at least in one line in the second light transmission means, by which almost all incident light rays can be transmitted along entire length of the second light transmission means with minimized loss. The light coupling means may be composed of at least one optical element with high reflactive index, having a cross-sectional shape selected from a group of a trapezoidal, a triangular, a half-circular and a "U" shape. The first light transmission means may have a first terminal surface and the second light transmission means may have a second terminal surface. A common i.e. single light generating means may be provided in order to project light rays to the first terminal surface and/or the second light transmission means. |
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DETAILED DESCRIPTION An object of this invention is to provide a flat panel type light source device (i.
e.
a flat light source) or a surface light source device, having uniform brightness of surface in a light transmission panel for illumination, utilizing an edge-light effect.
A further object of this invention is to provide a passive type display device with a flat panel type light source device, having uniform brightness of surface in a light transmission panel for illumination and to provide the passive type display device, using the edge-light effect.
According to one preferred embodiment of this invention, a flat light source comprises a first light transmission means, being for use for illumination only, with relatively high refractive index and relatively high light transmission characteristics; a second light transmission means, being for use as bypass light guide only, including a plurality of light-guides, wherein each of the light-guides has relatively high refractive index and relatively high light transmission characteristics; and a light coupling means, making light coupling between the second light transmission means and the second light transmission means for changing direction of light rays, wherein the light rays output from the second light transmission means are changed in direction in order to input into the first light transmission means.
According to another preferred embodiment of this invention, a passive display, comprising: a flat panel type passive display; and a flat light source; wherein said flat panel type light source device, further composing; a flat light source comprises a first light transmission means, being for use for illumination only, with relatively high refractive index and relatively high light transmission characteristics; a second light transmission means, being for use as bypass light guide only, including a plurality of light-guides, wherein each of the light-guides has relatively high refractive index and relatively high light transmission characteristics; and a light coupling means, making light coupling between the second light transmission means and the second light transmission means for changing direction of light rays, wherein the light rays output from the second light transmission means are changed in direction in order to input into the first light transmission means
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Light Fixtures 
