摘要:
Projection television display tubes having an evacuated envelope (1) with a display window (4) which on its inside comprises a display screen (5) and in front of which a light permeable second window (6) is provided on its outside, a cooling liquid (16) flowing through the space (7) between the display window (4) and the second window (6) from at least one inlet aperture to at least one outlet aperture (17) namely by temperature differences in said cooling liquid. When in such a projection television display tube at the area of the windows (4, 6) and around the said space (7) a cooling jacket (8) is provided which comprises at least one duct (9) which transports the cooling liquid (6) from the outlet aperture(s) to the inlet aperture(s) of the said space, an effective cooling is obtained at a power between 12 and 25-30 W without external pipes or a heat exchanger. As a result of the circulation of the cooling liquid around the tube end at the area of the windows there is a good temperature compensation so that fewer stresses occur in the glass of the display tube.
摘要:
A projection device features at least one monochrome display device including electro-optic means defining a pattern for display, a monochrome luminescent layer, a first interference filter for reflecting the luminescent emission forward toward a display screen, and a second interference filter for obtaining a limited transmission angle for the desired spectral output.
摘要:
A gas discharge laser in which the light beam emanating from said laser is linearly polarized by applying a transverse magnetic field in which reflectors are used which are more or less anisotropic and the anisotropy axes of which have a precise orientation relative to the magnetic field so that a high degree of polarization is obtained.
摘要:
A display system which comprises a means for changing the s/a.sub.v and/or p/a.sub.h ratio, the scanning-line pitch s and/or the pixel pitch p of incoming signals.
摘要:
A display device having a rectangular display window with a major and a minor dimension, and a deflection unit producing a scanning line raster on a display screen on the inner surface of the display window, the scan lines extending in the minor direction. The inside surface of the display window has a major radius of curvature (R.sub.cmajor), a minor radius of curvature (R.sub.cminor), a diagonal dimension (D) and an aspect ration (A), which parameters are related by the formulas 1.1 A*R.sub.cminor. The display window is thereby very flat and scanning line raster distortion is reduced so that it is easily correctible by the deflection fields produced by the deflection unit.
摘要翻译:具有主要和次要尺寸的矩形显示窗口的显示设备和在显示窗的内表面上的显示屏幕上产生扫描线光栅的偏转单元,扫描线沿小方向延伸。 显示窗口的内表面具有主曲率半径(Rcmajor),小曲率半径(Rcminor),对角线尺寸(D)和纵横比(A),这些参数由公式1.1 A * Rcminor。 因此,显示窗口非常平坦,并且扫描线光栅失真减小,使得其可以由偏转单元产生的偏转场容易地校正。
摘要:
A color cathode ray tube of the shadow mask or beam index type in which the screen structure applied to the faceplate has a plurality of triplets of optical interference filter stripes which are adapted to pass red (R), green (G) and blue (B) light produced by a homogeneous cathodoluminescent screen layer. The usual aluminium layer may be applied to the screen layer. The optical interference filter stripes may have short wave pass filters, band pass filters or a combination of both types. The short wave pass filter stripes may have modified quarter wavelength multilayer dielectric filters and the bandpass filter may have a Fabry-Perot filter.
摘要:
In a picture display device suitable for receiving and processing an incoming video signal which comprises horizontally scanned picture information and for displaying pictures which are composed of fields each of which comprises a given number of lines, a scanning section for generating line and field scanning signals for forming the lines and fields, respectively, is adapted to scan the lines in the vertical direction, a number of vertical lines constituting a field and the vertical line frequency being many times higher, at least 200 times, than the horizontal field frequency. A video signal processing section for processing the picture information which is present in the video signal comprises a scan direction transposition circuit for receiving the picture information and for sequentially assigning picture information to elements of the vertically scanned lines.
摘要:
In a device for measuring the cut-off wavelength of an interference filter for a projection television display tube, the interference filter and a bandpass filter are arranged one behind the other. The bandpass filter has a transmission characteristic with a cut-off wavelength which approximately coincides with the desired cut-off wavelength of the interference filter, but with a slope varying in the opposite direction. A white light beam generated in a light source is incident through the two filters. The intensity, which is measured by a detector on the other side of the filters, is a measure of the cut-off wavelength of the interference filter. The device may have a second measuring system for measuring the absorption of the interference filter.
摘要:
In a color display device (LCD) (1) driven in the transmission mode and based on the combination of (LCD) switching elements and a phosphor pattern, the phosphor pattern being irradiated, for example by a UV source, the light output is considerably increased by arranging an interference filter between the radiation source and the phosphor layer.
摘要:
The vertical viewing angle of a rear projection screen having a large horizontal viewing angle and good color correction due to the special shape of the light dispersing elements provided on the front side of the plate is increased by elements provided on the rear side and extending in a direction perpendicular to the front side elements. The latter are preferably total internal reflection elements, while the former are not. A bulk diffusor may be largely or completely dispensed with.