公开(公告)号：US20020192362A1

公开(公告)日：2002-12-19

申请号：US10055362

申请日：2002-01-23

Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.

Inventor： Daniel Den Engelsen ,  Ivo Maria Martinus Durlinger ,  Hideo Kikuchi ,  Masaharu Watanabe

IPC: B05D005/06 ,  B05D005/12

CPC classification number: H01J9/2278 ,  H01J9/2271 ,  H01J29/225

Abstract: In the manufacturing process of a screen (6), for use in a color display tube (1), a photosensitive process step, referred to as the exposure process, is used for applying the black matrix pattern and the phosphor layers to the display window (3) to form the screen (6). The robustness of this exposure process is dependent on, amongst others, the shape of the microscopic light distribution on the display window (3). It appears that in color display tubes (1) with an increased deflection angle, or in tubes with a real flat outer surface, the exposure process becomes more and more critical. According to the invention, this problem can be overcome by adding a bleaching dye to the photosensitive material used for the exposure process. This bleaching dye's action in the center of the microscopic light distribution is stronger than in the peripheral portions. As a result the slopes of the microscopic light distribution become steeper, leading to an increase of the contrast in the exposure process which thus becomes much more robust.

Abstract translation: 在屏幕（6）的制造过程中，为了在彩色显像管（1）中使用，使用称为曝光处理的光敏处理步骤，将黑矩阵图案和荧光体层施加到显示窗口 （3）以形成屏幕（6）。 该曝光过程的鲁棒性取决于显示窗（3）上的微观光分布的形状。 看来，在具有增加的偏转角的彩色显像管（1）中，或者在具有真实平坦外表面的管中，曝光过程变得越来越重要。 根据本发明，通过向用于曝光过程的感光材料中加入漂白染料可以克服这个问题。 这种漂白染料在微观配光中心的作用比周边部分强。 结果，微观光分布的斜率变得更陡，导致曝光过程中的对比度增加，因此变得更加鲁棒。

公开(公告)号：US20020036455A1

公开(公告)日：2002-03-28

申请号：US09961989

申请日：2001-09-24

Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.

Inventor： Daniel Den Engelsen ,  Ivo Maria Martinus Durlinger

IPC: H01J029/07

CPC classification number: H01J29/07 ,  H01J9/146

Abstract: In a colour display tube (1), the shadow mask (13) serves as the colour selective element. The major part of the electrons emitted by the electron gun (10) are intercepted by the shadow mask (13). These electrons can be absorbed by the shadow mask (13) or they can be reflected. In the first situation, where the electrons are absorbed, the shadow mask (13) is heated as a result of which it will be deformed, leading to misregistration of the electron beams (7, 8, 9) when they impinge upon the phosphor screen (6), causing colour impurities on the colour display tube (1). This phenomenon is commonly referred to as doming. In the second situation, where the electrons are reflected, degradation of the contrast performance takes place because the reflected electrons hit the phosphor screen (6) at totally different positions, leading to the generation of stray light. Both doming and contrast performance are important for the quality of a colour display tube (1). The problem however is that in order to optimize the doming performance, all electrons should be reflected and to optimize the contrast performance all electrons should be absorbed by the shadow mask (13). This invention provides a solution for this problem in that the shadow mask (13) is coated only at the surface at the gun side (20) with a heavy metal or an oxide thereof, having a high backscatter coefficient, which has a favorable effect on doming. Preferably, the screen side (21) of the shadow mask (13) and the walls (24, 25) of the apertures (22) are covered with a coating with a low backscatter coefficient, thereby improving the contrast in the vicinity of the position of the electron beam (7, 8, 9). In terms of visual perception a very good compromise between contrast and doming performancenulli.e. colour puritynullof a colour display tube (1) is achieved.

Abstract translation: 在彩色显像管（1）中，荫罩（13）用作选色元件。 由电子枪（10）发射的电子的主要部分被荫罩（13）截取。 这些电子可以被荫罩（13）吸收，也可以被反射。 在第一种情况下，当电子被吸收时，荫罩（13）被加热，结果会使其变形，导致电子束（7,8,9）撞击在荧光屏上时的对准 （6），在彩色显像管（1）上引起颜色杂质。 这种现象通常被称为垄断。 在电子被反射的第二种情况下，由于反射电子在完全不同的位置处撞击荧光屏（6），导致杂散光的产生，因此发生对比度性能的降低。 圆顶和对比度性能对于彩色显像管（1）的质量都是重要的。 然而，问题是为了优化拱顶性能，所有电子都应该被反射并优化对比度，所有的电子都应该被荫罩（13）所吸收。 本发明为这个问题提供了一种解决方案，因为荫罩（13）仅在枪侧（20）的表面用重金属或其氧化物涂覆，具有较高的后向散射系数，其对 穹顶 优选地，荫罩（13）的屏幕侧（21）和孔（22）的壁（24,25）被具有低后向散射系数的涂层覆盖，从而改善位置附近的对比度 的电子束（7,8,9）。 在视觉方面，对比度和穹顶性能之间是一个非常好的妥协 - 即 实现彩色显像管（1）的色纯度。