Apparatus and method for displaying image
First Claim
1. A liquid crystal display projector comprising:
- a light source for emitting light required for image display;
a transmission type liquid crystal display device having a liquid crystal layer having an alignment of a plurality of twisted liquid crystal molecules, the liquid crystal display device for selectively applying a voltage to the liquid crystal layer in response to an image signal, thereby realigning the liquid crystal molecules and thus modulating light passing through the liquid crystal layer;
a projection lens for projecting the light modulated by the liquid crystal display device;
a polarizer for allowing linearly polarized light, which is contained in light emitted from the light source, to enter into the liquid crystal display device;
an analyzer for allowing linearly polarized light, which is contained in light exiting from the transmission type liquid crystal display device, to enter into the projection lens; and
a first optical compensator located between the liquid crystal display device and the analyzer on a light exit side of the liquid crystal display device and containing a substance having birefringence equivalent to birefringence of a negative crystal, the first optical compensator for compensating for an optical phase difference caused by liquid crystal molecules in a light-entry-side region of the liquid crystal layer;
a second optical compensator located on the light exit side with respect to the liquid crystal display device and containing a substance having birefringence equivalent to birefringence of a negative crystal, the second optical compensator for compensating for an optical phase difference caused by liquid crystal molecules in the light-exit-side region of the liquid crystal layer; and
a third optical compensator located on the light exit side with respect to the liquid crystal display device, the third optical compensator for compensating for an optical phase difference caused by liquid crystal molecules present in a region of the liquid crystal layer excluding the light-entry-side region and the light-exit-side region.
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Accused Products
Abstract
Provided is a projection type liquid crystal display apparatus, which can improve black-level display and thus can display a higher-contrast image as compared to the related art. An optical compensator is located on the light exit side with respect to the liquid crystal display device so as to compensate for the optical phase difference caused by liquid crystal molecules in a light-entry-side region of the liquid crystal layer. As the optical compensator is located on the light exit side with respect to the liquid crystal display device, birefringence, caused by the liquid crystal molecules present in the light-entry-side region, is compensated for without being influenced by a microlenses provided in the liquid crystal plane. Consequently, the apparatus can improve the black-level display and thus can display a higher-contrast image as compared to the related art. Further, a phase difference caused by the birefringence of the nematic liquid crystal molecule is compensated for by using a substance having properties optically opposite to the positive crystal, namely, a substance having birefringence equivalent to birefringence of a negative crystal.
51 Citations
5 Claims
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1. A liquid crystal display projector comprising:
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a light source for emitting light required for image display;
a transmission type liquid crystal display device having a liquid crystal layer having an alignment of a plurality of twisted liquid crystal molecules, the liquid crystal display device for selectively applying a voltage to the liquid crystal layer in response to an image signal, thereby realigning the liquid crystal molecules and thus modulating light passing through the liquid crystal layer;
a projection lens for projecting the light modulated by the liquid crystal display device;
a polarizer for allowing linearly polarized light, which is contained in light emitted from the light source, to enter into the liquid crystal display device;
an analyzer for allowing linearly polarized light, which is contained in light exiting from the transmission type liquid crystal display device, to enter into the projection lens; and
a first optical compensator located between the liquid crystal display device and the analyzer on a light exit side of the liquid crystal display device and containing a substance having birefringence equivalent to birefringence of a negative crystal, the first optical compensator for compensating for an optical phase difference caused by liquid crystal molecules in a light-entry-side region of the liquid crystal layer;
a second optical compensator located on the light exit side with respect to the liquid crystal display device and containing a substance having birefringence equivalent to birefringence of a negative crystal, the second optical compensator for compensating for an optical phase difference caused by liquid crystal molecules in the light-exit-side region of the liquid crystal layer; and
a third optical compensator located on the light exit side with respect to the liquid crystal display device, the third optical compensator for compensating for an optical phase difference caused by liquid crystal molecules present in a region of the liquid crystal layer excluding the light-entry-side region and the light-exit-side region. - View Dependent Claims (2, 3, 4, 5)
wherein the first optical compensator and the second optical compensator are located between the polarizer located on the light exit side and the liquid crystal display device.
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Specification