JPH09505454A - Color cathode ray tube and display device - Google Patents

Abstract

(57) [Summary] To generate such a turbulent moire effect in such a cathode ray tube by selecting the number of holes per row in the shadow mask of the color cathode ray tube in the range between 615 and 650. Can be used in both PAL, NTSC systems and MUSE systems. In the second form, the number of holes per row ranges between 425 and 450.

Description

Detailed Description of the Invention                       Color cathode ray tube and display device   The invention has an electron gun for generating at least one electron beam and a row of holes. The color selection electrode, the display screen, and the row of holes between the ends of the color selection electrode. Means for deflecting the electron beam in a line deflection direction to cut It is about pipes.   Such display devices are known. These are especially used in television receivers. Have been.   The disturbing effect that may occur in such a display device is the so-called moire It is for. This effect causes the light and dark bands, or colors in the image, to deviate. Generate a band that lets you.   During operation, the direction of line deflection on the display screen by one or more electron beams The line is written to. The number of lines written on the display screen (Iwayu The number of effective lines) depends on the system. In PAL and SECAM systems , About 537 lines are written on the display screen (in these systems, the signal 625 lines, of which about 50 are used for the information to be coded and the remaining Approximately 7% of the 575 lines are scanned near the display screen, the so-called "overscan" Therefore, the total number of effective lines is about (625-50) /1.07=537. ). In NTSC system, about 452 effective lines are written (NTSC signal is 525 With lines. ). For the so-called MUSE scan mode, the effective scan line The number is about 967. In operation, the color cathode ray tube is preferably a PAL, SECAM, Whether it is used for different systems like NTSC or MUSE system Regardless, the disturbed moire effect is not shown on the display.   It is an object of the present invention to be used in multiple systems and to have turbulent moire. The object is to provide a color cathode ray tube with little or no effect.   For this reason, the color cathode ray tube according to the first aspect of the present invention can reduce the number of holes per row. It is characterized by having a range between 615 and 650.   To date, "standard" systems usually have a guideline of holes from 590 to 605 per row. I do. In this range (≈590 to 605), PAL, SECAM and NTSC can be used. Is not perfect, but moire effects can be avoided to some extent. However, With this number of holes, disturbed moire occurs in MUSE applications. PAL, SECA Other "standard" systems with 455 to 470 holes per row for M use only and Other "standard" systems with 380 to 400 holes per row for NTSC use only There is also Mu. These systems exhibit highly disturbed moire in other applications. The color cathode ray tube according to the present invention does not exhibit such a disturbed moire effect. this Due to the advantages, the color cathode ray tube according to the first aspect of the invention is suitable for any television system. Suitable for stems, and thus a significant cost reduction can be achieved.   Within the range of 615 to 650 holes per row, the range of 625 to 635 is preferred. You. This range reduces moiré and the possible adverse effects of raster distortion on moiré effects. Very suitable for impact.   The invention has an electron gun for generating at least one electron beam, a row of holes Cross the row of holes between the color selection electrodes, the display screen and both ends of the color selection electrodes. A color cathode ray tube having means for deflecting the electron beam in a line deflection direction; Providing a display device comprising means for receiving PAL or SECAM television signals It is also intended to serve.   Reduction of moire that exists beyond any of the existing "standard" systems In order to achieve Scanning pitch, and a_vIs the vertical mask pitch, s / a_vratio Should be between 9.2 / 8 and 9.5 / 8 for the PAL system and Suitable for PAL systems to be between 9.3 / 8 and 9.5 / 8 It is a feature. s / a_vThe corresponding value of the ratio is 10.9 for NTSC systems. Between 1/8 and 11.38 / 8, and 5.11 / 8 and 5.33 / 8 for MUSE systems In between. Within the scope of the invention, NTSC or MUSE display devices are Display device suitable for receiving CAM), NTSC or MUSE signals Should be understood.   An example where the aspect ratio of a cathode ray tube in a display system is approximately 16: 9 is s / a_vThe ratio is Range between 10.7 / 8 and 11.3 / 8 for PAL system and NTSC system Amplify the received signal to be in the range between 12.7 / 8 and 13.4 / 8 with respect to the stem Means for displaying on screen in mode.   An example where the aspect ratio of a cathode ray tube in a display system is approximately 4: 3 is s / a_vThe ratio is The received signal should be in the range between 8.9 / 8 and 9.6 / 8 for the NTSC system. Means for displaying the number on the screen in compressed mode.   The inventor has further found that not only the display device that receives the television signal but also the personal computer For color cathode ray tubes that can also be used for computer or graphic displays The demand for it was also realized. On screen for such a system The number of lines written to PAL, SECAM, NTSC and MUSE sys It is different from Tem. The number of lines written on the screen is Equal to 480, 600 and 768 for VGA, SVGA and XGA scan modes. Normal When the correction for the underscan applied to VGA, SVGA and XGA is performed, For total mask height (comparable to 537 for PAL and 452 for NTSC) The number of scan lines that can be identified is about 520 for the VGA system, and the SVGA system About 645 for a stem and about 830 for a so-called XGA system. Receiving A television signal to be transmitted (for example, also referred to as a television mode for simplicity below. Display system for PAL signals with approximately 537 write lines and (e.g. For example, it has 645 write lines, which are also shown in graphic mode for simplicity below Used for display system for graphic display (used for SVGA system) The known color cathode ray tube for use is one of two systems (SVGA). Shows a clear moire pattern. The cathode ray tube according to the first aspect of the present invention is Can also be used for graphic display systems using A or XGA systems it can.   The inventor of the present invention has a PAL system test in addition to the cathode ray tube according to the first aspect of the present invention. Most graphic display systems including revision display systems and SVGA systems A cathode ray tube that can be used for the stem can be achieved.   Providing a color cathode ray tube that can be used in television and graphic modes Therefore, the number of holes per row should range between 425 and 450, preferably between 435 and 450. is there.   Such a color cathode ray tube can be used in a PAL system and a VGA or S Shows little or no moire patterns when used in VGA graphic mode Not. This allows one same color display tube to be connected to a graphic display device and It can be used for revision receivers. This will significantly reduce manufacturing costs. Can be achieved.   These and other features of the present invention will be described in detail by way of embodiments with reference to the drawings. I will tell.   FIG. 1 shows a color cathode ray tube.   FIG. 2 shows details of the color selection electrode.   3A-3D are features of the present invention relating to the display of a 4: 3 image on a 16: 9 display screen. The signs are illustrated.   4A-4C are features of the invention relating to the display of 16: 9 images on a 4: 3 display screen. The signs are illustrated.   The drawings are diagrammatic.   Like numbers refer to like parts in the drawings.   FIG. 1 is a partial perspective view of the cathode ray tube 1. The cathode ray tube 1 has a display window 2. A drainage container 3 and a neck 4. In this neck, there are three electrons in this example. An electron gun 5 for generating beams 6, 7 and 8 is provided. Inside the display window 3, for example, A light emitting display screen 9 is provided which comprises fluorescent elements which emit red, green and blue light. School On the way to the lean 9, the electron beams 6, 7 and 8 are moved between the neck and the cone. Deflection between the two ends of the screen 9 by the deflection unit 10 arranged at the joint between And a shardma comprising a color selective electrode, in this example a thin plate having holes 12. Pass the disc 11. The electron beams 6, 7 and 8 pass through the hole 12 at a small angle to each other. Each electron beam passes through and hits the fluorescent element of only one color. This figure shows the electron gun and The drive mechanism 14 of the directing unit and the image receiving means 15 for receiving the signal 16 are also shown diagrammatically. You. Depending on the system, the image receiving means is PAL, SECAM, NTSC or MUS. E-TV signals can be received.   FIG. 2 is a detailed top view of the color selection electrode. The color selection electrode has a plurality of rows of holes 2. With one. The rows extend across the line deflection direction x. In sequential rows , The holes are offset from each other across the line deflection direction. Scan line 22 is also shown. The direction crossing the line deflection direction is also called the field deflection direction. In most cathode ray tubes and display systems, the field deflection direction is vertical and the The in-deflection direction is horizontal. Therefore, the rows of holes are vertically aligned. Before The scan line is a position where one or more electron beams are incident on the shadow mask. Is shown diagrammatically.   The so-called P used in Europe, Asia, Africa and parts of South America In the case of AL and SECAM systems, the shadow is incident on the shadow mask -About 537 lines hit the display screen after passing through the holes in the mask You. For example, the number of effective lines of the NTSC system used in the United States is about It is 452. In Japan, the number of active lines is about (1125-90) /1.07=937 MUSE The system is in use. In FIG. 2, the scanning line pitch s is shown. Scan this The distance between lines. Distance between holes (vertical mask pitch) a_vAlso shows.   Moire due to interference of hole patterns in color-selective electrodes with scan line patterns. The action occurs. The moire effect is the vertical direction (in this case the horizontal bar is Visible in the image. ) Causes an oblique angle (a diagonal bar appears in the image). example For example, combinations of these that appear in the form of diamond patterns may occur. You. In each of the systems (PAL-SECAM; NTSC, MUSE) , Different moire effects occur.   According to the present invention, various existing sys- tems can be produced without causing a disturbed moire effect. It is possible to provide a color cathode ray tube that can be used in various systems and applications. To this advantage Therefore, a significant cost reduction can be achieved. With different types of display devices Can use the same color cathode ray tube. Various types of color cathode ray It is also possible to use the same color selection electrode for the tube. The present invention is based on PAL (SE CAM), NTSC or MUSE system A cathode ray tube not shown is also provided. Use of color cathode ray tubes in television systems. The regional limitation to is eliminated in the cathode ray tube according to the first aspect of the invention. .   The color cathode ray tube according to the present invention preferably has a number of holes per row between 615 and 650. Is characterized by a range between 625 and 635. This is PAL Between 9.2 / 8 and 9.6 / 8 for stems, preferably 9.3 / 8 and 9.5 / 8 for PAL systems Between s / a_vRatio (where s is the scanning pitch for all frames, and a_vThe mask I will ). S / a for NTSC system_vCorresponding range of ratio The enclosure is between 10.91 / 8 and 11.38 / 8, s / a for MUSE system_vRatio of The range covered is between 5.11 / 8 and 5.33 / 8. PAL (SECAM), NTSC or Is a MUSE display device, within the scope of the present invention, PAL (SECAM), NTSC or Is understood to mean a display device suitable for receiving each MUSE signal. Should be. The invention applies to wide screen devices (greater than 50 cm) and (greater than 4: 3). Particularly useful for widescreen devices (for example, having an aspect ratio of 16: 9). is there.   s / a_vThe ratio is the number of holes in a row and the lines of the entire frame scanned across the holes. It is the same as the ratio of numbers in the first approximation. Therefore, (about 53 scanned across the hole For a PAL system (of 7 lines), 615 holes per row are 615/537 = 1.15 = 9.2 / 8 S / a_vEquivalent to the ratio. 625 holes per row is s / a_v= 625/537 = corresponds to 9.3 / 8 You.   The present invention also relates to a display device including such a color cathode ray tube. .   So far, s / a_vIt was known that the ratio affects the moire effect. s / a_vIs 2n Moire pattern occurs when / 8 (n is an integer) and s / a_vBecomes (2n + 1) / 8 It was assumed that no moire patterns would occur at the same time. Therefore, s / a_v The ratio was chosen symmetrically for the "forbidden" value of 2n / 8. However, the structure of the present invention Within the limits, the optimum ratio was achieved without being symmetrical about the "forbidden" ratio of 2n / 8. Than Specifically, the 8 / 8'forbidden 'ratio s / a_vIs a high-amplitude or highly disturbed "Forbidden ratio" s / a of 10/8 against that_vIs equivalent to a low-amplitude dynamic moire. I realized that. Under normal operating conditions greater than a factor of 10, the moiré amplitude It was not previously recognized that the difference was very large. The above situation On the basis of the "optimal ratio" between 8/8 and 10/10, the said range is 9.2 / 8 and 9.6 / 8 I found that there exists a very asymmetrical relationship between and. Low values (including the value 9/8) Increases still image moire. Therefore, in the PAL system, s / a_vRatio is about Optimal is 9.4 (± 0.2) / 8, which corresponds to the number of holes between 615 and 650. (Believe so far Low values (including the "optimum value" of 9/8 that was used) are still image moire that deteriorates image quality. Increase the action. S / a between 9.2 / 8 and 9.3 / 8 in the absence of raster distortion_vvalue Is optimal. However, the raster distortion is s / a over the entire mask._vThe ratio fluctuates Means to show. s / a_vIf the ratio increases to a value greater than 9.2 to 9.3 / 8, The disturbed moiré effect is less than that in the case where the moiré effect decreases. Therefore, suitable S / a to create a "safety limit"_vMake the ratio somewhat higher than 9.3 / 8. However While s / a higher than 9.6 / 8_vThe value of may induce dynamic moire. PAL S / a (between 9.2 / 8 and 9.6 / 8) to stem_vThe values shown for the ratio are NTSC S / a between 10.91 / 8 and 11.38 / 8 for the system_vValue and for MUSE system S / a between 5.11 / 8 and 5.38 / 8_vCorresponds to the value.   S / a between 8/8 and 10/8_vIn applying the scope, i.e. the scope of construction of the invention S / a used in the enclosure_vThe range is very unpaired for the "forbidden" values 8/8 and 10/8 In fact, more specifically realize that you need to choose closer to 10/8 than to 8/8, 4 S / a between / 8 and 6/8_vThe same applies when the range is applied. Between 4/8 and 6/8 The "suitable" range is above the predetermined range 5.11 / 8 to 5.33 / 8 (MUSE) compared to 4/8. Exists closer to 6/8 to the match.   In another aspect of the invention, s / a_vThe ratio 12/8 is not significantly more forbidden than 8/8 Was recognized. Therefore, according to the invention in the range 10.91 / 8 and 11.38 / 8, NTS For C applications, slightly larger s / a closer to 12/8_vMoire is reduced by the ratio .   Therefore, if you have a number of holes between 615 and 650, preferably between 625 and 635 , PAL, SECAM, NTSC and MUSE systems A cathode ray tube capable of   Within the scope of the present invention, even-numbered or odd-numbered lines were scanned first. Scan the line by the so-called interlaced method that scans the other second line after That is, the lines can be scanned sequentially.   In progressive scan mode, the moiré pattern is generally reduced somewhat more.   A table with a larger aspect ratio (ie, an aspect ratio greater than 4: 3) The present invention relates to a display device, and more particularly to a display device having an aspect ratio of 16: 9. 3A to 3D show other features of FIG. An image with an aspect ratio of 4: 3 has a 16: 9 aspect ratio. Does not fill the screen with aspect ratio. Fills the screen better Therefore, the display device can be provided with means for enlarging the image in the horizontal direction. FIG. 3A shows a widescreen display device displaying a 4: 3 image. However , As before, the displayed image is vertically scaled this way by a factor of 1.333. Larger, s / a_vThe ratio also changes with a factor of 4: 3. This is the expansion of the PAL system S / a for the mode_vMeaning the ratio will change from about 9.4 / 8 to 1.333 * 9.4 / 8 = 12.5 / 8 To taste. On the other hand, s / a of moire effect_vThe ratio may be disturbed. Enlarge image By increasing the amount, the moire effect is greatly reduced, and as a result, s / a_vRatio is 10.7 / 8 and 11.3 / 8 The range is between and. If you use a normal NTSC type display, S / a_vThe ratio changes from about 11/8 to 14.7 / 8. In contrast, the moire effect s / a_vThe ratio can also be disturbed. By enlarging the image slightly smaller vertically The moiré effect is significantly reduced, resulting in s / a_vThe ratio is in the range between 12.7 / 8 and 13.4 / 8. Be surrounded. 3A to 3D are related to the display of a 4: 3 image on a 16: 9 screen. The light features are illustrated. Figure 3A is displayed horizontally on a 16: 9 screen Size of 4: 3 format image broadcasting for PAL system when expanding only to Show the law. The screen is shown as a solid line and the image displayed on the screen is shown as a dashed line. You. Usually there is overscan so that the dashed line extends slightly beyond the solid line. For simplicity And place one in the center and one of the others in each corner. Assume an originally undistorted image with five circles. As you can see from the figure, The image is distorted and the circle becomes an ellipse with a height to width ratio of 3: 4. In this figure, width is marked with 4 and height is marked with 3. Also displayed in the following drawings Attach the width and height of the image. The distortion of the image displayed on the screen is known per se Is a problem. FIG. 3B shows a conventional problem dealing with this problem. . The image is vertically oriented (by increasing the line spacing s) by a factor of 1.333. Be expanded to. FIG. 3C illustrates the features of the present invention. In this figure, the image also has a small coefficient Therefore, it is enlarged in the vertical direction. Expansion factor to PAL or SECAM system As a result s / a_vThe ratio is in the range between 10.7 / 8 and 11.3 / 8 and N Resulting s / a for TSC system_vRatios range between 12.7 / 8 and 13.4 / 8 To be established. The resulting magnification factor is approximately that of the non-magnification mode. s / a_vDepending on the ratio and the system to some extent, a range between 1.15 and 1.25 instead of 1.33. Be surrounded. Reducing the vertical expansion of the image has several advantages. Conventional system Then 33% of the image originally displayed disappears, whereas in the device according to the invention Since only about 20% of the image is lost, the number of lines lost (and thus the image (Not displayed) decreases. The part of the image that has disappeared in FIGS. 3B and 3C. The minutes are marked A1 and B1. Obviously, the area B of FIG. 3C is compared to the area A of FIG. 3B. You can see that it is small. And more importantly, s / a_vThe ratio in FIG. 3B About 12.5 / 8 (for PAL system) and about 14.7 (for NTSC system) / 8 to about 11/8 (PAL) and 13/8 (NTSC) in FIG. 3C. This has the advantage that the moire effect is greatly reduced. Another advantage is that The ability to display details is improved. As shown in Figure 3C, the image displayed The image dimensions are 4 (width): 3 (height). This is apparent in the situation shown in Figure 3A. Although it is a definite improvement, it can be further improved. Can be further improved One of the sexes is shown in Figure 3D. In this figure, the image is scaled vertically by 0.9. Compressed by the number, 3.6 (width): 3.6 (height). The image displayed from the original is With a perfect fit on the lean, such a reduction would cause the left side of the displayed image to Two black bars (marked C1 in Figure 3D) appear on the right side. Each bar has a display It has a horizontal dimension of about 5% of the clean horizontal dimension. However, in reality An image is displayed with a slight 7% overscan. Therefore, the bar is approximately 1.5% ( 1 cm) smaller. Such bars are only slightly visible. Of course, Horizontally compress the image by a smaller amount (for example, a factor of 0.95) where the bars are no longer visible. You can shrink it, but the displayed image will be somewhat distorted and the width of 3.8: 3.6: Has a height ratio. However, for most images, such distortion I can hardly see you. A modified example is shown in FIG. 3E. In this figure, the displayed image The horizontal dimension is compressed at the center of the screen resulting in a perfect circle. However At the edges of the screen, the horizontal dimension is somewhat enlarged. As a result, the screen At the center of the image is a perfect image, but at the edges it is a distorted image and at the same time the image is Fill the screen completely. Therefore, in this embodiment, the image is horizontally Scene distortion combined (about 1.15 to 1.25) s / a_vAn increase in the ratio is imposed.   A related issue when displaying 16: 9 images on a cathode ray tube with a 4: 3 screen Occurs. FIG. 4A shows a 16: 9 image displayed on a 4: 3 screen. This image is clear There is a slight distortion. The conventional way to solve this problem is to make the image vertical. It is to compress by a factor of 1.33 in the direction. FIG. 4B is the resulting image . Black bars appear at the top and bottom of the image. Image displayed for NTSC system If we reduce the image vertically by a factor of 1.33, we get s / a_vThe ratio is between 10.91 / 8 and 11.38 / 8 From 8.2 / 8 to 8.5 / 8. These s / a_vStrict moire effect against the ratio Occurs. According to an embodiment of the invention, the cathode of the screen with an aspect ratio of 4: 3 The NTSC type display system with a line tube is the image displayed on the screen. S / a_vWith means for vertical compression so that is between 8.9 / 8 and 9.6 / 8. This S / a of these_vAlmost no moire effect occurs with respect to the ratio. At this time, the vertical direction of the image The lateral dimension is reduced by a factor of about 1.2. Enlarge image horizontally if desired To reduce or overcome any distortion of the resulting image by Can be. The resulting image (without horizontal magnification) is shown in FIG. 4C. Mo Aside from the lesser occurrence of stray effects, the smaller the black bar There is another advantage. Therefore, FIGS. 3A to 4C show images with a predetermined aspect ratio. View images on different (larger or smaller) size display screens The features of the present invention relating to the problems that arise when performing 1.15 instead of traditional 1.33 By establishing a horizontal expansion or compression factor that should be between More favorable s / a_vRatio and better screen Will meet.   The invention can further be used in a display device receiving a television signal. As well as a personal computer or graphic display The demand for a color cathode ray tube that can also be realized has been realized. Such a personal Write on screen for computer or graphic display system The number of lines included is the same as for PAL, SECAM, NTSC and MUSE systems. Be different. The number of lines written across the entire screen Considering applying the conventional underscan of about 8% for the purpose of Approximately 520 for the SVGA system and 650 for the so-called XGA system. About 830 for the Television signal (for example, with about 537 write lines Display system (eg, about 520 write lines) Display system for a graphic display (using a VGA system with The known color cathode ray tube for use in a system is notable for its use in one of two systems. The pattern is shown. The color cathode ray tube according to the first aspect of the present invention has a VGA system. System with little or no moire pattern for Therefore, as far as the application is concerned, it is a very wide range of applications in any area. It can be used.   The inventor of the present invention has a PAL system test in addition to the cathode ray tube according to the first aspect of the present invention. Predetermined graphics even when not suitable for revision display system and SGVA In order to achieve a cathode ray tube that can be used in a display system.   Providing a color cathode ray tube that can be used in television and graphic modes Therefore, in the color cathode ray tube according to the second aspect of the present invention, the number of holes in each row is 425 and 4. It is characterized by being in the range between 50 and preferably between 435 and 450.   Such color cathode ray tubes are used in PAL or SECAM systems Moire pattern when using in VGA or SVGA graphic mode Show little or no information. This allows one identical cathode ray tube to The display device and the television receiver can be used. This A significant reduction in manufacturing costs can be achieved. s / a_vThe ratio is PAL It exists between 6.5 / 8 and 6.8 / 8 in the stem and is used in VGA graphic mode. If it exists between 6.7 / 8 and 7/8 and is used in SVGA graphic mode. Exists between 5.35 / 8 and 5.6 / 8. Any of these ratios displayed Accurately corresponds to the ideal ratio according to the theory allowed in each of the modes thereafter S / a without_vThe ratio is such that no or very little moire pattern occurs. . Due to this feature of the invention (in countries where PAL or SECAM systems are used At least locally, a system (television system) in which a cathode ray tube can be used. System or graphic display system) type restrictions can be removed . Range 425-435 is for VGA, SVGA or XGA systems over normal underscan Low, for example 4-5% is advantageous when used. Less than normal underscan Have the advantage that the available fluorescent screen area can be used more effectively .   S / a for VGA and XGA modes_vRatio between about 9.5 / 8 and 10/8 (VGA) and And between about 5.9 / 8 and 6.3 / 8 (XGA), the color according to the first feature of the present invention. -Cathode ray tube (color cathode ray tube with holes between 615 and 650 per vertical row) Are suitable for use in VGA and XGA modes. Against these ranges Thus, little or no moire effect occurs.   The use of cathode ray tubes in different systems in any of the aspects of the invention. Is removed. This can result in a significant reduction in manufacturing costs. Wear.   Tables 1 and 2 summarize the different features of the invention. Table 1 shows the shadow mask Depending on the number of holes of Indicates that it can be used. Table 2 shows the non-expanded mode and the expanded mode or the compressed mode. Different systems and corresponding s / a in_vSummarize the ratio. In this case, expansion and pressure Reduction is in the vertical direction.   In summary, the number of holes per vertical row in the shadow mask of a color cathode ray tube can be calculated. By choosing a range between 615 and 650, such a cathode ray tube can be PAL, NTSC and MUSE systems and Can be used on many systems, including multiple systems used for traffic display You can see that. In the second embodiment, the number of holes in each row is 425 to 450, preferably Is between 435 and 450. Such a color cathode ray tube can be installed in a PAL system and Can be used in a number of graphic display systems.

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Claims (1)

[Claims] 1. An electron gun for generating at least one electron beam, a color selection electrode having a row of holes, a display screen, and deflecting the electron beam in a line deflection direction across the row of holes between the ends of the color selection electrodes. A color cathode ray tube comprising a means, wherein the number of holes per row is in the range between 615 and 650. 2. 2. The color cathode ray tube according to claim 1, wherein the number of holes in each row is in the range between 625 and 635. 3. An electron gun for generating at least one electron beam, a color selection electrode having a row of holes, a display screen and means for deflecting the electron beam in a line deflection direction across the row of holes between the ends of the color selection electrode. In a PAL or SECAM type display device comprising a color cathode ray tube and means for receiving PAL or SECAM television signals, where s is the scan pitch for all frames and a _v is the vertical mask pitch. A PAL or SECAM type display device characterized in that the s / _av ratio is between 9.2 / 8 and 9.6 / 8 during operation. 4. The PAL or SECAM type display device according to claim 3, wherein the s / _av ratio is between 9.3 / 8 and 9.5 / 8. 5. The color cathode ray tube comprises a display screen having an aspect ratio greater than 4: 3, and the display device has an s / _av ratio of an image displayed in a magnified mode of 10.7 / 8 and 11.3 / 8. 5. A PAL or SECAM type display device according to claim 3 or 4, further comprising means for enlarging an image displayed on the screen in a field deflection direction so as to be in a range between them. 6. An electron gun for generating at least one electron beam, a color selection electrode having a row of holes, a display screen and means for deflecting the electron beam in a line deflection direction across the row of holes between the ends of the color selection electrode. In an NTSC type display device comprising a color cathode ray tube and means for receiving an NTSC television signal, if s is the scan pitch for all frames and a _v is the vertical mask pitch, during operation, s / a _v ratio NTSC type of display device is characterized in that so as to exist between 10.9 / 8 and 11.38 / 8. 7. The color cathode ray tube includes a display screen having an aspect ratio greater than 4: 3, and the display device has an s / _av ratio of an image displayed in a magnified mode of 12.7 / 8 and 13.4 / 8. 7. The NTSC type display device according to claim 6, further comprising means for enlarging an image displayed on the screen in the field deflection direction so as to be in a range between them. 8. The color cathode ray tube comprises a display screen having an aspect ratio of 4: 3, and the display device has a s / _av ratio of a compressed image in a range between 8.9 / 8 and 9.6 / 8. 7. An NTSC type display device according to claim 6, further comprising means for compressing an image of the received signal displayed on the screen in the field deflection direction. 9. An electron gun for generating at least one electron beam, a color selection electrode having a row of holes, a display screen and means for deflecting the electron beam in a line deflection direction across the row of holes between the ends of the color selection electrode. In a MUSE type display device comprising a color cathode ray tube and means for receiving a MUSE television signal, when s is a scanning pitch for all frames and a _v is a vertical mask pitch, during operation, s / a _v ratio MUSE type of display device is characterized in that so as to exist between 5.11 / 8 and 5.33 / 8. Ten. An electron gun for generating at least one electron beam, a color selection electrode having a row of holes, a display screen, and deflecting the electron beam in a line deflection direction across the row of holes between the ends of the color selection electrodes. A color cathode ray tube comprising a means, the number of holes per row being in the range between 425 and 450, preferably between 435 and 450. 11. An electron gun for generating at least one electron beam, a color selection electrode having a row of holes, a display screen and means for deflecting the electron beam in a line deflection direction across the row of holes between the ends of the color selection electrode. In a PAL or SECAM type display device comprising a color cathode ray tube and means for receiving a PAL or SECAM television signal, where s is the scan pitch for all frames and a _v is the vertical mask pitch. , A PAL or SECAM type display device characterized in that the s / _av ratio is between 6.5 / 8 and 6.8 / 8 during operation.