摘要:
The invention relates to a polarization compensating element (PCE) for a liquid crystal, e.g. liquid crystal on silicon (LCoS), display system manufactured using a linearly photo-polymerizable polymer (LPP) for orienting a photo-polymerizable liquid crystal polymer (LCP) film. To decrease the reflection, polarization conversion, and interference events in an LPP/LCP assembly the ΔN birefringence value of the LCP material is minimized. Dielectric coatings are added at various locations throughout the assembly for minimizing the amount of reflection, polarization conversion, and interference effects and for suppressing spatial retardance ripples.
摘要:
A C-plate compensator is disclosed for compensating the residual A-plate and C-plate retardance of a reflective liquid crystal on silicon (LCoS) display or a transmissive liquid crystal (LC) display in a projection display system. The C-plate incorporates a form-birefringent coating, whose retardance magnitude can be adjusted by tilting with respect to the display panel (X-Y) plane. The tilted plate is rotated about the Z-axis by a prescribed amount from the slow axis of the display panel. Criteria are described for choosing the tilt and rotation angles such that the contrast of the display system produced by the compensated panel is optimized.
摘要:
The present invention relates to trim retarders used to compensate for residual birefringence created by liquid crystal display panels. In particular the present invention relates to a trim retarder with negative out-of-plane birefringence provided by a form birefringent multi-layer dielectric stack for compensating for retardances resulting from liquid crystal on silicon display panels.
摘要:
Optical pick-up units (OPU), which require several light sources for reading newer formats, such as Blu-Ray, and legacy formats, such as DVD and CD, require a series of beam splitters/combiners for directing the various source light beams from the light sources along a common path. A two-mirror reflector sub-unit, in which at least one mirror includes a thin film dielectric retarder element, is used to redirect the beams traveling along the common path onto the disc-media, while imposing a 90° retardation onto the polarized light incidence, whereby light returning from the disc-media undergoes a 90° orientation change in the state of polarization from one linear polarization to the other orthogonal linear polarization.
摘要:
Contrast compensation for a liquid crystal display projection system including a light source, a first polarizer, a liquid crystal display panel, and a second polarizer is provided using a tilted compensating plate. The compensating plate includes a first birefringent element having an optic axis oriented at a first angle to the plate normal, where the first angle is greater than zero degrees (e.g., an A-plate or O-plate), and a second birefringent element having an optic axis oriented at a second angle to the plate normal, where the second angle is substantially equal to zero degrees (e.g., a C-plate). The compensating plate is tilted relative to a plane of the liquid crystal display panel. The tilted compensating plate has been shown to provide improved contrast compensation for twisted nematic liquid crystal displays.
摘要:
A single-layer birefringent crystal trim retarder includes a birefringent crystal cut such that its optic axis is at a high oblique angle and such that it provides low in-plane retardance values even when the birefringent crystal is relatively thick. To compensate for the inherent high +C-plate retardance of this high-tilt O-plate, the single-layer birefringent crystal is coupled with a −C-plate thin-film retarder to provide a trim retarder having an overall A/−C-plate retarder functionality. This full-function trim retarder is practical to fabricate, is thickness and azimuthal angle tolerant, and is suitable for low sensitivity angular clocking requirements of LCoS panel compensation.
摘要翻译:单层双折射晶体微调延迟器包括双折射晶体切割,使得其光轴处于高倾斜角度,并且即使当双折射晶体相对较厚时也提供低的面内延迟值。 为了补偿该高倾斜O板的固有的高+ C板延迟,单层双折射晶体与-C板薄膜延迟器耦合以提供具有整体A / C 板式延迟器功能。 该全功能微调缓速器可实现制造,厚度和方位角的宽容度,适用于LCoS面板补偿的低灵敏度角时钟要求。
摘要:
A single-layer birefringent crystal trim retarder includes a birefringent crystal cut such that its optic axis is at a high oblique angle and such that it provides low in-plane retardance values even when the birefringent crystal is relatively thick. To compensate for the inherent high +C-plate retardance of this high-tilt O-plate, the single-layer birefringent crystal is coupled with a −C-plate thin-film retarder to provide a trim retarder having an overall A/−C-plate retarder functionality. This full-function trim retarder is practical to fabricate, is thickness and azimuthal angle tolerant, and is suitable for low sensitivity angular clocking requirements of LCoS panel compensation.
摘要翻译:单层双折射晶体微调延迟器包括双折射晶体切割,使得其光轴处于高倾斜角度,并且即使当双折射晶体相对较厚时也提供低的面内延迟值。 为了补偿该高倾斜O板的固有的高+ C板延迟,单层双折射晶体与-C板薄膜延迟器耦合以提供具有整体A / C 板式延迟器功能。 该全功能微调缓速器可实现制造,厚度和方位角的宽容度,适用于LCoS面板补偿的低灵敏度角时钟要求。
摘要:
An optical pick-up including a fold mirror having an achromatic quarter-wave plate coating is provided. To allow the thin film coating to efficiently provide the quarter-wave retardation, the optical pick-up is configured such that the polarization of light incident on the fold mirror is at a predetermined angle. According to one embodiment, the predetermined angle is provided by rotating the light sources. According to another embodiment, the predetermined angle is provided by rotating a plane containing the light sources and the beam combiners. In each embodiment, the beam combiners and the fold mirror are arranged along the same axis to further improve efficiency.
摘要:
Cartesian polarizers utilizing liquid crystal polymers (LCPs) are provided for use as laser protection filters in optical pick-up units. The LCPs are photo-aligned and cross-linked into a polymer host to provide a durable filter. According to one embodiment, the LCP molecules exhibit a cholesteric phase and are coupled to one or more quarter-wave retarders. According to another embodiment, the LCP molecules are used to form a multi-layer stack using the giant-birefringence optics effect.
摘要:
Contrast compensation for a liquid crystal display projection system including a light source, a first polarizer, a liquid crystal display panel, and a second polarizer is provided using a tilted compensating plate. The compensating plate includes a first birefringent element having an optic axis oriented at a first angle to the plate normal, where the first angle is greater than zero degrees (e.g., an A-plate or O-plate), and a second birefringent element having an optic axis oriented at a second angle to the plate normal, where the second angle is substantially equal to zero degrees (e.g., a C-plate). The compensating plate is tilted relative to a plane of the liquid crystal display panel. The tilted compensating plate has been shown to provide improved contrast compensation for twisted nematic liquid crystal displays.