Projection television set, screens, and method
AssigneeGeneral Electric Company
InventorEugene George Olczak
Life of this patent
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Abstract
RD 29133-17-A method for facilitating a reduction of speckle in a screen receiving light from a light source includes positioning at least one optical path distributing screen element such that the light originating from the light source passes through the screen element and emerges decorrelated from the screen element toward an audience space. The method further includes positioning an angular distribution element between the screen element and the audience space such that the angular distribution element distributes the decorrelated light from the screen element toward the audience space.
Claims63
A method for facilitating a reduction of speckle in a screen receiving light from a light source, said method comprising the steps of:
- positioning at least one optical path distributing screen element such that the light originating from the light source passes through the screen element and emerges decorrelated from the screen element toward an audience space;
- and
- positioning an angular distribution element between the screen element and the audience space such that the angular distribution element distributes the decorrelated light from the screen element toward the audience space.
A method for facilitating a reduction of speckle in a projection television screen, said method comprising the steps of:
- providing a plurality of optical path distributing screen elements each including a light-incidence light engine side and a light-emergence audience side, the screen elements shaped such that a distribution of optical paths of light exiting at least eighty percent of the screen elements from the audience side is at least two times the coherence length of the light;
- and
- positioning a plurality of diffuser elements between the screen elements and an audience space such that the diffuser elements distribute decorrelated light emerging from the screen elements toward an audience space.
A rear projection television comprising:
- a housing;
- a light engine positioned in said housing;
- and
- a screen positioned between said light engine and an audience space, said screen mounted to said housing and comprising:
- a field lens;
- at least one optical path distributing screen elementoperationally coupled to said field lens;
- and
- at least one angular distribution element operationally coupled to said non-imaging optical screen element and positioned such that said angular distribution element distributes a decorrelated light emerging from said screen element toward the audience space.
A screen for a rear projection television, said screen comprising:
- a light engine side comprising at least one optical path distributing screen element;
- and
- an audience side comprising at least one angular distribution element positioned such that said angular distribution element distributes decorrelated light emerging from said screen element toward an audience space.
A unitary screen for a rear projection television, said screen comprising:
- a light engine side comprising at least one non-imaging optical screen element comprising a substantially ten by five degree trapezoid concentrator comprising a polycarbonate having an index of refraction of about 1.59;
- and
- an audience side comprising at least one diffuser element positioned such that said angular distribution element distributes decorrelated light emerging from said screen element toward an audience space, said trapezoid concentrator shaped such that a distribution of optical paths of light exiting said screen is at least two times a coherence length of the light.
Dependencies are inferred from the claim text.