Thin high efficiency illumination system for display devices
AssigneeDisplay Technology Industries
InventorRichard D. Ketchpel
Life of this patent
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Abstract
An illumination system for a display device includes an array of cylindrical lenslets for imaging an adjacent array of different color monochromatic emitting phosphor stripes onto the display device. Also included is a microcollimator reflector for each stripe which partially collimates emitted light from each phosphor stripe with respect to at least one axis of the display. An edge-irradiated energy distributor plate efficiently distributes ultra-violet energy by total internal reflection to the phosphor stripes that act as scattering and absorbing centers for the ultra-violet energy.
Claims13
An illumination system for a display screen device having a screen composed of multicelled pixels for selectively controlling the intensity of light wherein said illumination system comprises:
- means for remotely energizing a plurality of parallel luminescent stripe areas;
- and
- reflective means for concentrating the emitted light from said stripe areas in a vertical plane which is perpendicular to said stripe areas and also perpendicular to said display screen while maintaining a non-directive emission pattern of said light in a horizontal plane which is also perpendicular to said display screen whereby a wide horizontal viewing angle is preserved for ease of viewing by a group of side-by-side observers.
An illumination system for a display device having a screen composed of multicelled pixels for intensity modulating the primary colors of light, and a light source for illuminating said screen, said illumination system comprising:
- means for energizing different color phosphor stripes in alignment with multicelled pixel control elements;
- and
- reflective means for concentrating the emitted light from said phosphor stripe toward said screen in one dimension in a vertical plane while maintaining a non-directional emission pattern in the orthogonal horizontal plane whereby a wide horizontal viewing angle is preserved for ease of viewing by a group of side-by-side observers.
Dependencies are inferred from the claim text.