摘要:
Device for projecting television pictures by means of an assembly of three television picture tubes with associated lens systems arranged in each other's proximity, including an integrated cooling system. The integrated cooling system has a liquid circuit comprising a first duct extending below the television picture tubes, which duct is in direct communication via passages with the lower ends of the flow spaces, and a second duct extending above the television picture tubes, which duct is in direct communication via passages with the upper ends of the flow spaces. The first and the second duct are connected via at least one connection duct which extends along an end the assembly constituted by the three television picture tubes.
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:
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.
摘要:
A cathode ray tube having a tensioned shadow mask with elongated holes, i.e. holes with a length longer than 5 mm. The pattern of holes repeats itself after 5 or more rows and the relation between the number of rows after which the pattern repeats itself, the vertical pitch av and the horizontal pitch dh is given by av/dh≦n2≦8av/dh, most preferably n2≈2av/dh.
摘要:
A light emitting device for use in lighting and/or display applications includes a UV/blue LED located in a depression having reflecting sidewalls, a light transmitting material surrounding the LED and filling the depression, and a phosphor in the form of particles either dispersed in the light transmitting material or adhered to the surface of the LED. The sidewalls reflect UV as well as visible light, thus enhancing the efficiency of the device. Optical filters located on the top of the LED and/or the bottom of a UV absorbing glass plate covering the depression further enhance efficiency and/or spectral characteristics of the emitted light.
摘要:
A projection television system comprising an array of three projection television display tubes (14) luminescing in red, green and blue, a focusing lens (16) associated with each tube and a display screen (12) on which the respective optical images are merged to form a single multicolored image. At least one of the display tubes (14) has a multilayer interference filter (46) between the phosphor (30) and the faceplate (20). In order to imprve the light output at the corners of the display screen (12), the cut-off angle of the first filter layers is varied between the center and the corners thereof, for example by increasing the optical thickness of the filter layers relative to the center.
摘要:
The CRT has a tensioned shadow mask with between 160-180 or between 210 and 240 slits per row and display devices having such CRT's. The first embodiment is in particular suited for CRT''s having a screen size larger than 21″ and for TVT applications, giving a substantially Moire free image for an NTSC, PAL and VGA signal, the second embodiment is in particular suited for CRT's having a screen size of 23″ or smaller and for CMT applications, giving a substantially Moire free image for a SVGA and XGA signal.
摘要:
By selecting the number of apertures per vertical row in the shadow mask of a color cathode ray tube to be in the range between 615 and 650, such a cathode ray tube can be used both in a PAL, an NTSC system and a MUSE system without the occurrence of disturbing Moire effects. In a second embodiment the number of apertures per row ranges between 425 and 450.
摘要翻译:通过选择彩色阴极射线管的阴影掩模中每垂直行的孔数在615和650之间,这样的阴极射线管可以在PAL,NTSC系统和MUSE系统中使用,而不需要 发生令人不安的Moir + E,acu e + EE效应。 在第二实施例中,每行的孔数在425和450之间。
摘要:
By selecting the number of apertures in the shadow mask of a color cathode ray tube system to be such that the s/a.sub.v ratio, where s is the scan pitch for the entire frame and a.sub.v is the vertical mask pitch, is between 5.8/8 and 6.4/8 (5.8/8.ltoreq.s/a.sub.v .ltoreq.6.4/8) or between 9.4/8 and 10.6/8 where the lines are progressively scanned or, where the lines are scanned in an interlace mode with a frequency higher than 70 Hz, the s/a.sub.v ratio is between 5.8/8 and 6.4/8 (5.8/8.ltoreq.s/a.sub.v .ltoreq.6.4/8) or between 9.4/8 and 10.6/8, a cathode ray tube system is provided with a reduced occurence of disturbing Moire effects.
摘要:
Projection television display device includes three monochrome projection television display tubes (20, 21, 22) each having a display screen (24, 25, 26) which is provided on the inside of the display window (23) and luminesces in a different color. Each tube has an optical axis extending perpendicularly from the center of the display screen, the optical axes (33, 34, 35) of the three display screens being co-planar. The axes (34, 33) of the display screens of the first and second tubes (20, 22) coincide and the axis (35) of the display window of the third tube (21) constitutes the main axis of the device, the axis being perpendicular to the two coincident axes (33, 34). Two flat dichroic intersecting reflective mirrors (27, 29) extend perpendicularly of the plane and through the point of intersection of the axes, each at an angle of 45.degree. with the main axis. The first mirror (27) reflects the image of the first display screen and the second mirror (29) reflects the image of the second display screen into the direction of the main axis and away from the third display screen, interference filters being disposed between the display screens and mirrors for passing the desired color of light. With interference filters disposed between the luminescent material of the display screens and the display windows, the reflection greatly increases for light rays constituting an angle of more than 20.degree. to 35.degree. with the normal of the filter. When there is substantially no transmission up to 90.degree., there is a gain in brightness by a factor of 1.5 to 2, a gain in contrast by more than a factor of 2 and also a considerable color improvement and reduction of color errors when the conventional green and blue phosphors are used.