KR0141100B1 - Color braun tube arrangement structure of projection tv. - Google Patents

Abstract

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Description

The color CRT arrangement of the TV receiver.

The present invention relates to a method for arranging color CRTs in a projection TV receiver, and in particular, by arranging the color CRTs differently from the existing methods, the shape of the horizontal stripes becomes approximately rectangular. The present invention relates to a color CRT arrangement structure of a television set used for efficient use.

Conventional TV receivers include a tilt method, a shift method, and a complex method in which the same is used. First, the tilt method includes a G-color CRT tube at the center as shown in FIG. Then, R and B color CRTs are installed to have a convergence angle equal to θ and matched to the screen surface by giving a compensation angle equal to β as shown in Fig. 4B. The horizontal streaking image of (Rasting Form) is as shown in (c) of FIG.

In addition, the shift method arranges the RGB color CRTs in parallel with each other, as shown in Fig. 5A, thereby shifting the position of the image shifted by d to the R and B-Callala CRT or the image thereof from the center of the projection lens. The shape of the horizontal stripe is as shown in Fig. 5 (C) in such a manner that the three images are matched by moving as shown in Fig. 5 (B) by a predetermined distance t.

On the other hand, the compounding method is a combination of the tilting method and the shifting method. As shown in Fig. 6A-C, the convergence angle θ 'on the color CRT and the moving distance t from the center of the screen are shown. Simultaneously applied to the image of the three color Braun tube is configured to form on the screen, the horizontal stripes appearing on the screen is as shown in (d) of FIG.

However, in the shift method, as the color CRT is fixed and the horizontal stripe shape is shifted, the horizontal stripe size is reduced, so the use of the color CRT screen is inefficient. The loss of is increased, which affects the brightness of the screen, and even in the inclination method, the trapezoidal shape represented by the convergence angle appears to have a horizontal stripe shape that is biased to one side, thereby reducing the size of the horizontal stripe. Even in the horizontal stripes, there is a limit to implement the size of the problem was not able to watch a beautiful image.

The present invention takes the method of aligning one color CRT on two color CRTs in order to solve such a conventional problem, the convergence angle is about half smaller than the conventional method, so that the horizontal stripes of R and B color CRTs are formed. It is an object of the present invention to provide a method for arranging a color CRT tube of a projection TV receiver capable of more efficiently using a G color CRT tube surface to view a beautiful image. Same as

(A)-(d) of FIG. 1 are diagrams for explaining the color CRT match structure of a television set of the present invention.

(A)-(d) of FIG. 2 is a figure for demonstrating and comparing the match structure of this invention with the structure by a conventional method.

3 is another embodiment of the present invention, showing the arrangement structure, (a) shows the structure seen from the upper side, (b) shows the structure seen from the side.

(A)-(d) of FIG. 4 are views for explaining a conventional tilting method.

(A)-(d) of FIG. 5 are diagrams for explaining a conventional shift method.

(A)-(d) of FIG. 6 are views for explaining a conventional composite method.

의 관계를 갖게 되는데, 이때 n은 액냉의 굴절율이고, M은 배율이다.As shown in (a)-(d) of FIG. 1, the present invention is installed so that the R and B color CRTs on the same line with the compensation angle of γ have a convergence angle of θ 'from the center line. G color CRT having a compensation angle of 'is characterized in that it is arranged to have a convergence angle of θ unlike R and B color CRTs, where the relationship between the compensation angle and the convergence angle is

Where n is the refractive index of liquid cooling and M is the magnification.

Referring to (a)-(d) of FIG. 2, the effect of the present invention made in such a manner is as follows.

First, a compensation angle between the color CRT and the lens is obtained according to the convergence angle of the color CRT lens assembly, and the value of the gallow stripe shape of the image in the CRT is determined by this value.

In this process, the convergence angle has a great influence on the occurrence of the galloping-shaped bias and the difference in the length of the smell.

Therefore, when the distance S between the lenses is very small compared to the TCL of the TV receiver, the convergence angle? May be expressed as an approximation as follows.

Tan^-1(S/TCL)θ

Tan ^-1 (S / TCL)

Where S is the distance from the optical axis to the central axis of the color CRT and TCL is the distance from the screen to the front of the color CRT.

From the above equation,? Can be seen that the smaller the value.

Accordingly, when the system is constructed as shown in (a)-(c) of FIG. 1, the S value is reduced to 1/2 compared to the conventional method, and the? Value is also reduced by that. Therefore, the horizontal stripe shape of the RGB color CRT is approximately rectangular. It becomes closer to and can use color CRT tube more efficiently.

In the case of the system of the present invention, since the G color CRT has a convergence angle with the screen, the horizontal streaks of the G color CRTs are not rectangular but the horizontal streaks as shown in (d) of FIG. Will appear.

On the other hand, (a)-(d) of FIG. 2 are shown to compare the size of the horizontal stripes of the methods of the system with the screen size of 45 and the distance from the screen to the front of the color CRT (TCL) of 938.mm. (A) of FIG. 2 shows the horizontal stripe size in the conventional inclination method, (b) is the horizontal stripe size in the composite method, (c) is the horizontal stripe size of the R color CRT tube in the present invention, ( d) is the horizontal stripe size of the G color CRT of the present invention.

That is, the case of (b) rather than (a) of FIG. 2 is closer to the rectangle of (c) than the method of the present invention rather than (b).

In addition, according to the method of the present invention, the shape of the horizontal stripe of the G color CRT is not rectangular, but because it has a small convergence angle, it can be seen from (d) of FIG. 2.

Figure 3 shows a schematic configuration in the arrangement of the present invention, (a) is a view from above, (b) is a view from the side, embodiments of the invention shown in the drawing is R, G and B In a production TV composed of three color CRTs, the convergence angle between the symmetry lines of the first and third color CRTs arbitrarily selected and each optical axis is? ', And the plane formed by the first and third color CRTs And a converging angle formed by the optical axis of the other second color CRT becomes?.

That is, in the configuration of the present invention, as shown in the drawing, the first color CRT and the third color crown are arranged at an angle of θ by tilting the CPT axis by γ 'with respect to the lens optical axis, and the second color CRT is arranged on the lens optical axis. The CPT axis is inclined by γ 'with respect to the angle of θ.

S in the drawing shows the distance between the lens center of the first color CRT and the bisector tube of the axis formed by the first color CRT and the third color CRT, and S 'is the lens center of the second color CRT and the first color CRT. Θ is the angle formed by the lens optical axis of the first color CRT and the bisector of the axis formed by the first color CRT and the third color CRT, and θ 'is the angle of the plane formed by the optical axis of the third color CRT. The angle formed by the plane formed by the optical axis of the first color CRT or the third color CRT is represented, and the TCL is the distance from the screen to the front of the color CRT.

In the above, γ and γ 'satisfy the following equation.

As described above, according to the present invention, since the size of the image using the color CRT can be known larger by a simple method, when using the same color CRT, the color CRT surface can be used more efficiently, so that a beautiful image can be viewed. You can get it.

Claims (2)

In the projection TV consisting of three color CRTs, R, G, and B, the convergence angle formed by the symmetry lines of two arbitrarily selected color CRTs and the respective lightworms, and the plane of the two color CRTs and the other one of the color CRTs The convergence angle formed by the optical axis is set to be. The angle (compensation angle) formed by the central axis of the color CRT is set to the lens optical axis of the two randomly selected color CRTs, and is set to the lens optical axis of the other color CRT. Color CRT arrangement structure of a projection TV (TV) receiver, characterized in that the angle (compensation angle) formed by the CRT central axis is The color CRT arrangement of claim 1, wherein γ and γ ′ are satisfied.

A color CRT arrangement structure of a television receiver (TV) receiver, characterized in that to satisfy the.

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