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    A METHOD OF PRODUCING A SEGMENTED LENS AND A SCREEN FOR A COLOUR DISPLAY DEVICE
    3.
    发明公开
    A METHOD OF PRODUCING A SEGMENTED LENS AND A SCREEN FOR A COLOUR DISPLAY DEVICE 审中-公开
    制造用于彩色显示设备分段镜片和屏幕

    公开(公告)号：EP1297363A2

    公开(公告)日：2003-04-02

    申请号：EP01965009.2

    申请日：2001-06-19

    申请人： Koninklijke Philips Electronics N.V.

    发明人： HEEMSTRA, Tewe, H. ,  POORTER, Tiemen

    IPC分类号： G02B3/00

    CPC分类号： H01J9/2273 ,  B29D11/00269 ,  G02B3/08

    摘要： In the manufacturing process of colour display tubes with a dotted screen pattern, to form the screen (11), a segmented lens (3) is used for exposing the display window (4) in order to apply a structure of a black matrix layer and a layer with electroluminescent material to it. Principally, a segmented lens (3) gives rise to a phenomenon that is called facet marking; this is a result of the fact that the images of consecutive facets (12) of the lens on the screen (11) are disjunct or partly overlap, giving dark lines (42) or bright lines (44). In present day colour display tubes - especially for use as computer monitors - it is getting more and more important to reduce facet marking as far as possible. It is proposed to manufacture the segmented lens (3) according to a new process in which the mould (30) for the manufacture of said segmented lens is significantly changed. In the new process, the poles (31) for the mould (30) are stacked by placing them with cylindrical projections (36) into apertures (38) of the carrier plate (37). This prevents leaning poles (31), which result in errors in the inclination of the facets (12). This method of manufacturing the mould (30) makes it possible to decrease the facet size and significantly improve the facet marking in colour display tubes.

    METHOD OF PRODUCING A SCREEN FOR A COLOUR DISPLAY TUBE
    4.
    发明公开
    METHOD OF PRODUCING A SCREEN FOR A COLOUR DISPLAY TUBE 审中-公开
    工艺用于生产FARBIBE CRT显示器的扩散

    公开(公告)号：EP1338022A1

    公开(公告)日：2003-08-27

    申请号：EP01993011.4

    申请日：2001-10-16

    申请人： Koninklijke Philips Electronics N.V.

    发明人： HEEMSTRA, Tewe, H.

    IPC分类号： H01J9/227

    CPC分类号： H01J9/2273

    摘要： The invention relates to a method of producing a screen (6) having a striped structure of electroluminescent material on a display window (3) of a colour display tube (1). In present day colour display tubes (1), this screen (6) is produced using a photochemical process for exposing a photosensitive material which is applied to the display window (3). Normally, the exposure device used for this process comprises two lenses, a first lens (28) for correcting the rotation of the image of the elongated light source (22) and a second lens (27) for taking care that the landing position of the light on the display window (3) will be representative of the landing position of the electron beams (7), (8), (9) in the colour display tube (1) when it is operated. Unfortunately, the prior art system has the disadvantage that the line-growth factor is not constant over the entire screen (6). As a result, a change in the amount of light in the exposure process leads to a change in the distribution of the line width over the screen (6) and hence to a change of the luminance distribution. This invention provides a solution to this problem by introducing a third lens element (35) into the exposure device. This lens element (35), that breaks the four-quadrant symmetry of the prior art system, enables a deliberate and controlled rotation of the image of the elongated light source (22) on the screen (6) in such a way that the line-growth factor is made constant over the entire screen (6). In a preferred embodiment, the first lens (28) and the third lens (35) are integrated to form one lens (36).

    METHOD OF PRODUCING A SCREEN FOR A DISPLAY DEVICE, SCREEN FOR A DISPLAY DEVICE PRODUCED BY MEANS OF SAID METHOD AND DISPLAY DEVICE PROVIDED WITH SAID SCREEN
    5.
    发明公开
    METHOD OF PRODUCING A SCREEN FOR A DISPLAY DEVICE, SCREEN FOR A DISPLAY DEVICE PRODUCED BY MEANS OF SAID METHOD AND DISPLAY DEVICE PROVIDED WITH SAID SCREEN 审中-公开
    工艺用于生产显示器件的扩散器，用这种方法制造的屏幕显示装置及显示装置此屏幕

    公开(公告)号：EP1088321A1

    公开(公告)日：2001-04-04

    申请号：EP00926824.4

    申请日：2000-04-06

    申请人： Koninklijke Philips Electronics N.V.

    发明人： HEEMSTRA, Tewe, H.

    IPC分类号： H01J9/227

    CPC分类号： H01J9/2273

    摘要： In cathode ray tubes with a dotted screen structure (20), current requirements make it necessary to have a screen structure (25) with elongated matrix apertures, in order to have a good performance with respect to moiré and luminance. This invention discloses a method of producing a screen for a display device that uses a matrix structure with elongated matrix apertures. In the currently used method, a segmented lens with a plurality of facets is applied. A light-refracting means for instance, a prism (40) with a number of light-refracting surfaces (41, 42) is added to each facet (30), forming an undistinguishable part of the segmented lens. This creates a number of virtual light sources (48, 49) which is equal to the number of light-refracting surfaces. By separating these virtual light sources in the frame (mostly vertical) direction, this will lead to the exposure of an elongated matrix aperture, although a mask (5) with substantially round apertures is used. If the light-refracting means (64, 65, 66, 67) comprise prisms with three light-refracting surfaces (70, 71, 72) oriented in the line (mostly horizontal) direction, it is also possible to separate the three virtual light sources over such a distance that their images on the screen are disjunct and separated by a distance corresponding to the distance of the matrix apertures in a triplet. This makes it possible to expose the matrix in only one step, instead of the traditional three steps.