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US 6,637,891 B2Granted
Optical system of liquid crystal projector
AssigneeLG Electronics Inc.
InventorMan Ho Na
Life of this patent
Estimating the term…
Abstract
Disclosed is an optical system for a liquid crystal projector enabling to minimize a size of the optical system and a count of optical parts constructing the optical system using three pieces of reflective type liquid crystal displays. Accordingly, the present invention simplifies the optical system, thereby enabling to reduce a cost of production as well as a span length of the optical system.
Claims23
An optical system for a liquid crystal projector composing monochromatic images realized in first to third reflective liquid crystal panels respectively for enlarging projection of the composed images, the optical system comprising:
- a light source emitting a white light;
- an illumination part transforming the white light into a predetermined linearly-polarized light and releasing the linearly-polarized light;
- a first color selector transforming to polarize the linearly-polarized light released from the illumination part into another linearly-polarized light in accordance with a wavelength region;
- and
- a color resolution/composition part having four triangular prism blocks joined together and having coated surfaces having different characteristics, the color resolution/composition part splitting an incident light from the first color selector in colors to be incident on the first to third reflective liquid crystal panels respectively and composing the light of which image information is acquired from the first to third liquid crystal panels to release the composed light to a projecting lens system for the enlarging projection,
- wherein the first to third liquid crystal panels are arranged to confront first to third faces of the color resolution/composition part in part, wherein the projecting lens system is arranged to confront a fourth face of the color resolution/composition part in part, and wherein the first color selector is arranged to confront another portion of the same face of the third liquid crystal panel.
3 more elements
In an optical system for a liquid crystal projector composing monochromatic images realized in first to third reflective liquid crystal panels respectively for enlarging projection of the composed images, the optical system comprising:
- an illumination part transforming received light into a predetermined linearly-polarized light and releasing the linearly-polarized light;
- a first color selector transforming to polarize the linearly-polarized light released from the illumination part into another linearly-polarized light in accordance with a wavelength region;
- a color resolution/composition part constructed with first to fourth blocks bonded each other and having the same size, the color resolution/composition part splitting an incident light from the first color selector in colors to be incident on the first to third reflective liquid crystal panels respectively and composing to release the light of which image information is acquired from the first to third liquid crystal panels;
- and
- a second color selector transforming a first color light of the linearly-polarized lights released from the color resolution/composition part by polarization and transmitting the rest of the lights having other wavelengths so as to release the lights to the projecting lens system for the enlarging projection, wherein the first to third liquid crystal panels are arranged to confront first to third faces of the color resolution/composition part in part, wherein the projecting lens system is arranged to confront a fourth face of the color resolution/composition part in part, and wherein the first color selector is arranged to confront another portion of the same face of the third liquid crystal panel.
2 more elements
In an optical system for a liquid crystal projector composing monochromatic images realized in first to third reflective liquid crystal panels respectively for enlarging projection of the composed images, the optical system comprising:
- a light source emitting a white light;
- an illumination part transforming the white light into a predetermined linearly-polarized light and releasing the linearly-polarized light;
- a first color selector transforming the linearly-polarized light released from the illumination part into another linearly-polarized light in accordance with a wavelength region;
- a color resolution/composition part constructed with first to fourth blocks bonded each other and having the same size, the color resolution/composition part splitting an incident light from the first color selector in colors to be incident on the first to third reflective liquid crystal panels respectively and composing to release the light of which image information is acquired from the first to third liquid crystal panels;
- and
- a second color selector transforming the linearly-polarized lights released from the color resolution/composition part into other linearly-polarized lights by polarization in accordance with wavelength regions so as to release the lights to the projecting lens system for the enlarging projection, wherein the first to third liquid crystal panels are arranged to confront first to third faces of the color resolution/composition part in part, wherein the projecting lens system is arranged to confront a fourth face of the color resolution/composition part in part, and wherein the first color selector is arranged to confront another portion of the same face of the third liquid crystal panel, and wherein the color resolution/composition part further comprises:
- a first dichroic coating face coated on a contact face between the first and second blocks to separate a first color light from the incident light from the first color selector;
- a first polarizing beam splitting coating face coated on a contact face between the second and third blocks to split a transmitted light from the first dichroic coating face into second and third color lights by polarization so as to make the second and third color lights incident on the first and second liquid crystal panels, respectively, the first polarizing beam splitting coating face transmitting and reflecting the polarized second and third color lights by acquiring image information from the first and second liquid crystal panels;
- a second polarizing beam splitting coating face coated on a contact face between the first and fourth blocks to reflect the first color light from the first dichroic coating face to become incident on the third liquid crystal panel, the second polarizing beam splitting coating face transmitting the first color light of which image information is acquired from the third liquid crystal panel;
- and
- a second dichroic coating face coated on a contact face between the third and fourth blocks so as to transmit the second and third color lights transmitted/reflected through/from the first polarizing beam splitting coating face to the second color selector, the second dichroic coating face reflecting the first color light transmitted through the second polarizing beam splitting coating face to the second color selector.
8 more elements
In an optical system for a liquid crystal projector composing monochromatic images realized in first to third reflective liquid crystal panels respectively for enlarging projection of the composed images, the optical system comprising:
- an illumination part transforming received light into a predetermined linearly-polarized light and releasing the linearly-polarized light;
- a first color selector transforming the linearly-polarized light released from the illumination part into another linearly-polarized light in accordance with a wavelength region;
- a color resolution/composition part splitting an incident light from the first color selector in colors to be incident on the first to third reflective liquid crystal panels respectively and composing the light of which image information is acquired from the first to third liquid crystal panels to release the composed light to a projecting lens system for the enlarging projection, wherein the first to third liquid crystal panels are arranged to confront first to third faces of the color resolution/composition part in part, wherein the projecting lens system is arranged to confront a fourth face of the color resolution/composition part in part, and wherein the first color selector is arranged to confront another portion of the same face of the third liquid crystal panel;
- and
- a second color selector transforming the lights proceeding between the color resolution/composition part and the projecting lens system into a P-polarized light when a P-polarizing screen transmitting the P-polarized light only is used as a screen on which a composed image enlarged/projected by the projecting lens system is imaged.
2 more elements
Dependencies are inferred from the claim text.