摘要:
A hybrid lens and a projection optical system having the hybrid lens are provided. The projection optical system includes a hybrid lens that is positioned along an optical path between a fluorescent surface and a screen onto which light emitted from the fluorescent surface is projected to form an image. The hybrid lens includes a spherical lens and an aspherical lens formed of plastic on at least one surface of the spherical lens. Accordingly, aberration can be corrected to improve image quality.
摘要:
Provided are a projection optical system, a projection television, and a method of manufacturing a lens included in the projection optical system. The projection optical system includes lenses for projecting color beams onto a screen. A color filter layer, absorbing at least one of the color beams, is coated on the surface of at least one of the lenses.
摘要:
Provided are a projection optical system, a projection television, and a method of manufacturing a lens included in the projection optical system. The projection optical system includes lenses for projecting color beams onto a screen. A color filter layer, absorbing at least one of the color beams, is coated on the surface of at least one of the lenses.
摘要:
A high-brightness projection television is provided which includes a screen having a first lens for refracting an incident beam into a convergent beam, a second lens for refracting the beam refracted by the first lens into a divergent beam, and a protection plate for protecting at least the second lens, wherein an optical emission material is included in at least one of the above elements to convert invisible lights included in the incident beam into visible lights. Alternatively, the projection television may include an optical emission layer having the optical emission material between a light source and an image generator such as a liquid crystal display (LCD). Accordingly, vertical and horizontal angles of view are increased and overall brightness of the image is improved.
摘要:
Provided is an image display screen having wide horizontal and vertical viewing angles and a projection television including the same. The image display screen includes a Fresnel screen, a first lenticular screen that widens a horizontal viewing angle and a second lenticular screen including a first portion that widens a vertical viewing angle and a second portion that prevents degradation of contrast due to external light, and a protective screen. The second lenticular screen and the protective screen can be replaced by an integrated screen or a composite screen having the characteristics of both. In addition, a pattern may be formed on the rear surface of the Fresnel screen to perform the same function as the first portion.
摘要:
A projection optical system and a projection television employing the same are provided. The projection optical system includes a lens module and an electron beam tube optical module. The lens module includes a plastic power lens and a hybrid lens. The hybrid lens includes a spherical, biconvex, glass lens and an aspheric lens layer formed on at least one face of the spherical lens. The electron beam tube optical module includes a C-shaped aberration correction device, a window, and a coolant disposed between the window and the aberration correction device. Accordingly, the projection television can provide high quality pictures. In addition, it is possible to reduce the manufacturing costs of the projection television.
摘要:
Provided is a method of manufacturing a hybrid aspherical lens. The method includes processing a spherical lens, depositing an aspherical lens material layer on the spherical lens, and pressing a compression mold with an aspherical surface onto the aspherical lens material layer to form the hybrid aspherical lens over the spherical lens. Thus, a hybrid aspherical lens without shaping errors can be manufactured using a simple process.
摘要:
A screen having improved contrast, a wide viewing angle, and uniform luminosity and a projection system including the screen are provided. The screen includes a Fresnel lens sheet, a lenticular lens sheet including first cylindrical lenses extending vertically and formed on a surface of the lenticular lens sheet, and a protective sheet including second cylindrical lenses. The second cylindrical lenses extend horizontally and are formed on a surface of the protective sheet. A tinted layer is formed on surfaces of the second cylindrical lenses. The projection system forms on an image on the screen. The image is generated by a display device and magnified and projected by a projection lens unit. Therefore, a viewer can watch the projection system from an angle wider than that provided by conventional projection systems.
摘要:
Provided is an image display screen having wide horizontal and vertical viewing angles and a projection television including the same. The image display screen includes a Fresnel screen, a first lenticular screen that widens a horizontal viewing angle and a second lenticular screen including a first portion that widens a vertical viewing angle and a second portion that prevents degradation of contrast due to external light, and a protective screen. The second lenticular screen and the protective screen can be replaced by an integrated screen or a composite screen having the characteristics of both. In addition, a pattern may be formed on the rear surface of the Fresnel screen to perform the same function as the first portion.
摘要:
A rear projector that can be made slim and compact and can prevent image reversal. The rear projector includes a cathode ray tube to scan light and generate an image, a projection lens unit to magnify and project the image generated by the cathode ray tube, a screen on which the projected image is formed, and a reflection optical system interposed between the projection lens unit and the screen to change a path of projected light. The cathode ray tube and the reflection optical system are arranged such that a raster direction of the cathode ray tube and a direction along which the image is formed on the screen are parallel or substantially parallel to each other.