TW388911B - Colour image tube - Google Patents

Abstract

In a color image tube having a phosphor screen composed of a blue-emitting phosphor, a green-emitting phosphor, and a red-emitting phosphor, the ratio A/B of the brightness A of the red-emitting phosphor to the brightness B of the blue-emitting phosphor is above 1.40. Thus, red color purity is improved without a decrease of the brightness of the phosphor screen. Consequently, a color picture tube with a wide color reproducible region can be provided.

Description

A7 ___B7___ V. Description of the invention (1) (Background of the invention) (Technical field of the invention) The present invention relates to a color video tube, and in particular to expanding the color reproduction range of the red color of a phosphor layer (a phoshor screen). Color image tube. (Prior art) Generally, a color image tube system has a peripheral device formed by a panel, a funnel and a neck, and a phosphor layer is provided on the inner surface of the panel to emit blue, green, and red, respectively. For this phosphor layer, the electron beam emitted by the electron gun is scanned through a shielding screen to display a color image. The important characteristics of the phosphor layer of this color video tube are: color bright, color constrast, and color purity (blue, green, and red) that determine the color reproducible region. The characteristics of these phosphor layers are largely dependent on a light-emitting property of each phosphor constituting the phosphor layer. In the past, a blue-emitting phospher used Z n S: Ag (Zinc Sulfide: Silver), and a green phosphor (g green-emitting phospher) used ZnS: Ag ( Zinc sulfide: silver), Au (gold), A1 (aluminum), ZnS: Cu (

Zinc Sulfide: Copper), A 1 (ming), or a mixture of these, a red-emitting phospher is used as 'Y 2 0 2 S ·' E u (Yttrium oxi sulfid: Europium) (yttria sulfide: thorium). Regarding the red phosphor Y2〇2: Eu, its luminous color is roughly the same (please read the precautions on the back before filling in this purchase:

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n I ^ ΙΓ. The paper size printed by the Shellfish Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs is in accordance with the Chinese National Standard (CNS) A4 (210 X 297 male *) -4-A7 B7 V. Description of the invention (2) The concentration of E u is proportional. As shown in Table 1, the higher the concentration of £ u, the more red the luminous color is. It becomes a luminous color with a wide color reproduction range, but conversely, the luminous brightness decreases. Therefore, the red phosphor is generally considered to be a balance between the two characteristics. It is often used ¥ 2〇23: Eu with an Eim concentration of 3% to 7% by weight. Table 1 Y2〇: Eu concentration of S: Eu Y phosphors (%) In the color of hair 31 Image tube S chroma Monochrome brightness (relative 値) Unit price of phosphor (relative 値) XY 3.9 0.615 0.335 100 100 5.6 0.625 0.330 95 110 (Please read the note f on the back before filling in this purchase)

· 1111111 I I I I Printed by Shelley Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs. Table 1 is a 17-inch color image tube with a phosphor pitch of 0.28 mm. Furthermore, this year, the demand for color image tubes for computers and other displays has increased. The display tubes used on this display require more blue, green and red colors than before to increase the color reproduction. "Expectations in the field" Only as for the red phosphor as described above, in order to improve its color purity, the concentration of Eu must be increased. Not only the brightness will be reduced, but the cost of the phosphor will be high. (The description of the invention) Therefore, the object of the present invention is not to reduce the luminous brightness of the phosphor layer.

I ΛχΓ. This paper size is in accordance with Chinese National Standard (CNS) A4 specifications (210 > «297 Kung * > -5- A7 A7 Printed by the shellfish consumer cooperation of the Intellectual Property Bureau of the Ministry of Economic Affairs __B7_; (3) (Do not increase Eu degree) Improve the color purity of red to provide a color image tube with a wide color reproduction range. The color image tube of the present invention is provided with a translucent panel and is provided on the panel. The phosphor layer formed by the blue phosphor, the green phosphor, and the red phosphor on the inner surface. The ratio a / b of the luminous brightness from the red phosphor to the luminous brightness b from the blue phosphor. It is characterized by 1.40 or more. The color image tube of the present invention is in the color image tube. The blue phosphor is made of Ag concentration of 0.015% to 0.08% by weight of ZnS: Ag. The above-mentioned red phosphor layer is a color image tube made of Eu concentration of 3.5% to 6.1% by weight 2Y2O2S: Eu, and a color filter is interposed between the phosphor layer and the panel. The color image manager of the device. (A suitable embodiment) The embodiment of the present invention will be described below. Figure 1 is This figure shows the essentials of the structure of a color image tube according to an embodiment of the present invention. As shown in FIG. 1, the color image tube is a peripheral device 4 formed by a light-transmitting panel 1, a funnel 2 and a neck 3. The inner surface of the panel 1 is provided with a phosphor layer 5 to be described later, and a shielding cover 6 is provided on the inner side opposite to the phosphor layer 5 »On the other hand, in the neck 3 of the peripheral device 4, it is provided for discharging The electron gun 7 of the thunder beam 6B, 6G, 6R. A shielding cover 6 is installed inside the funnel 2 and the shielding is provided by an external magnetic field. The paper is placed by the electron gun 7. The paper size applies the Chinese National Standard (CNS) A4 specification (210 * 297 mm) · 6-noodles — — — — — — — — — — — — — — — — — — — — (Please read the “Notes on the back to fill in this book first to buy” A7 _B7__ five 、 Explanation of the invention (4) (锖 Please read the precautions on the back before filling in this page) The electron beams 6B, 6G, 6R will be shielded from the inside 8. It is arranged outside the funnel 2 to generate a magnetic field. The beams 6B, 6G, and 6R emitted by the electron gun 7 are deflected by the deflection device 9. The electron beams 6B, 6G, and 6R deflected by the device 9 scan the phosphor layer horizontally and vertically through the shielding cover 6 to display a color image on the panel 1. The phosphor layer 5 is as shown in the figure. The matrix-shaped light absorbing layer 1 0 and the circular gap between the light absorbing layer 10 shown in 2 are regularly arranged to emit blue, green, and red phosphor dots 1 IB, 1 1G, respectively. , 1 1 R to form a dot matrix type. As shown in FIG. 3, phosphor dots 1 IB, 1 1G, 1 1R, and panel 1 are respectively interposed between the phosphor dots 1 1 B, 1 1 G,

1 1R color and color color calenders 1 2B, 1 2G, 1 2R are also available. The blue phosphor dot 1 1B is formed by ZnS: Ag, and the green phosphor dot 1 1G is printed by ZnS: Cu, Au, A1 'ZnS: Intellectual Property Bureau of the Ministry of Economic Affairs

Cu, A 1 or a mixture of these, and the green phosphor layer 1 1R are each formed of Y2O2S: Eu. In this embodiment, the concentration of Ag, the activator of blue phosphor ZnS: Ag, is 0.015% by weight to 0.08% by weight, and the concentration of Eu, the activator of green phosphor Y202S: Eu, is 3.5% by weight to 6.1. Reset%. The color filters (sheets) 12B, 12G, and 1 2 R shown in FIG. 3, that is, the blue filters 1 2 B are made of cobalt aluminate or ultramarine, for example, as shown by curve 13 in FIG. 4A. The spectral reflectance is efficiently applied through this paper scale to the Chinese National Standard (CNS) A4 specification (210 X 297 gong). Printed by A7 __B7_____ of the Intellectual Property Cooperative of the Ministry of Economic Affairs. 5. Description of the invention (?) The above blue Formed by a luminescent pigment of a phosphor. The green filter 1 2 G is composed of T i 0 2-N i 0 _ C 〇0-Zn η 0 'C 〇0-A 1 2 0 3-C r2 03-T i 〇2, etc. The curve shown in FIG. 4B is a spectral reflectance of 14, which is formed by the luminescent pigment that efficiently transmits the green phosphor. The red filter 1 2R is formed of a ferrous oxide, anthraquinone, etc., which has a spectral reflectance such as that shown by curve 15 in Fig. 4C and efficiently transmits the light-emitting pigment of the above-mentioned red phosphor. The phosphor layer 5 can be formed by a photo printing method using a mask as a photomask as shown in FIG. First, for the phosphor layer shown in FIG. 2, that is, a photoresist is coated on the inner surface of the panel 1 to form a photoresist 16, and then the photoresist 16 is exposed through a mask 6. The pattern of the electron beam passing hole 17 corresponding to the mask 6 is printed on the resist 16 (process (a)). Then, the photoresist 16 of the printing 3 pattern is developed to form a resist (layer) 18 formed by a pattern corresponding to the pattern of the electron beam passing hole 17 of the shielding cover 6 ( Process (b)). A black light absorbing paint is applied to the inner surface of the panel 1 on which the resist 18 is formed and dried to form a light absorbing paint layer 19 (process (c)). The light-absorbing coating layer 19 coated on the resist 18 is removed together with the resist 18 with a stripper, and a matrix of circular gaps 20 is formed on the inner surface of the panel 1.之 光 absorbing layer 10. (Process (d)). Thereafter, the inner surface of the panel 1 forming the matrix-shaped light absorbing layer 10 is coated with, for example, a phosphor paste containing blue phosphors and photosensitizers as main components and dried to form a phosphor paste layer 21 (process (E)). Then cover — — — — — — — — — — — 11111 — — — — — — (Please read the “f” on the back page * Fill in this page first) This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) -8 _ printed by A7 __B7_ of the Consumer Cooperatives of the Ministry of Economic Affairs of the Ministry of Economic Affairs __B7_ 5. Description of the invention Mask 6 exposes this phosphor paste layer 2 and exposes it to the phosphor paste layer 2 1 After printing a pattern corresponding to the electron velocity passage hole 17 of the shielding cover 6, the phosphor paste layer 21 of this printing pattern is developed and formed at the prescribed gap of the light absorption layer 10 Blue phosphor point 1 1 B (process (f)). For green phosphors, red phosphors are also the process (e) and process (f) of the process of repeating the blue phosphors. The green phosphor layer 11G and the red phosphor dots are formed in the prescribed gap of the light absorbing layer 10. 11R (process (g)) ° When the color filters 12B, 12G '1 2R are set as shown in FIG. 3, that is, after the matrix-shaped light absorbing layer 10 is formed, the phosphor paste is applied. Previously, a pigment dispersion liquid containing a pigment polymer dielectric and a photosensitizer as the main components was applied, and it was dried to form a pigment layer. In general, the blue, green, and red colors were sequentially formed as in the case of forming the above-mentioned phosphor dots. After the filters 12B, 12G, and 12R, the phosphor points 11B, 1 1 G, and 1 1 R may be formed. In the phosphor layer 5 described above, the blue phosphor dot 1 1 B is an activator Ag having a concentration of 0.015% to 0.08 wt% ZnS: Ag phosphor, and the red phosphor dot 1 1R That is, the concentration of the activator Eu is from 3.5% by weight to 6.1% by weight, and 2Y2O2S: Eu. And the ratio a / b of the luminous brightness a of the red phosphor to the luminous brightness b of the blue phosphor is 1.40 or more, so that it will not decrease the phosphor layer 5 when compared with the previous color image tube. Under luminous brightness, the purity of red color can be improved, which can make it a color image tube with wide color reproduction range. (Please read "Notes on the back" before writing this page)

This paper size is applicable to China National Standard (CNS) A4 specification (210 X 297 male *) -9- A7 _B7_ V. Description of the invention (7) The blue phosphor, green phosphor, and red phosphor are available In the formed color image tube of the phosphor layer 5, the ratio a / b of the luminous brightness a from the red phosphor to the luminous brightness b from the blue phosphor is very close to the expansion of the color reproduction range. This can be seen from the chromaticity coordinates. The chromaticity 値 X of the luminescence of the blue phosphor and the chromaticity 値 X of the luminescence of the red phosphor are very, very small, and in the color image tube, the electron beam 6B , 6G, 6R are provided with a shield 6 and an inner shield 8 in the passing area. Therefore, only the red phosphor 1 1 R is selectively made to emit light, and the electron beam 6 R that this red phosphor 1 1 R emits can be hit by these shielding covers 6 or inner shielding 8 and scattered. The red and green phosphors 1 1R and 11 1G are illuminated by the chaos, which causes the phosphors to add light and mix, and changes the chromaticity 値. Table 2 is for investigating the change in the chromaticity 由此 of this additive color mixture. For a monochromatic tube (17 inches, phosphor dot arrangement pitch 0.8 mm) that only forms red phosphor dots, and blue The three-color tubes (usually color image tubes) of the same type of fluorescent dots of green, red, and red respectively measure the red luminous chromaticity, and as shown in Table 2, the red luminous chromaticity 値 X has Significant changes. < Please read "Notes on the back before filling in this page) -------- Order—

^ ϋ ϋ I Printed by the Intellectual Property Bureau of the Ministry of Economic Affairs and Consumer Cooperatives. Table 2 Red luminous chromaticity X Υ pg ft, λτλτ Monochrome official 0.638 0.346 3 color tube 0.608 0.343 This paper standard · Applicable Chinese National Standard (CNS) A4 Specifications (210 X 297 mm) -10- A7B7 V. Description of the invention (8) So the blue phosphor is Ag concentration 0.02 wt% ^ ZnS: Ag, red phosphor and Eu concentration 3.9 wt% 2Y2〇2S: Eu, according to the method described above, a color image tube (17 inches) equipped with phosphor layers 1 2B, 1 2G, and 1 2R as shown in Fig. 3 The arrangement pitch of the phosphor dots is 0.28 mm), and the ratio a / b of the luminous brightness a from the red phosphor and the luminous brightness b from the blue phosphor is changed. The coating amount of the blue phosphor is approximately constant per 16 cnf 46 ± lrog, and the coating amount of the red phosphor is changed by 50 rag ~ 7 5 rag per 16 c m2 It is shown in Table 3 and FIG. ----------— — ---- (Please read the note $ on the back before filling out this page) Printed by the staff of the Intellectual Property Bureau of the Ministry of Economic Affairs, Cooperative Society 3 Luminous brightness of light body (cd / m2) / Luminous brightness of blue phosphor (cd / m2) 3 of color image tube 0: Color luminous chromaticity XY 8.2 / 21.8 = 1.294 0.608 0.334 28.6 / 21.4 = 1.336 0.609 0.335 32.5 /22.7=1.432 0.613 0.336 31.3 / 21.3 = 1.469 0.617 0.336 34.4 / 21.4 = 1.607 0.627 0.338 Measured by spectroradiometer MCPD-1000 manufactured by Otsuka Electronics Corporation. From the above results, it is clear that the more the brightness of the red phosphor can be set to -------- ΦΙΙ This paper size applies the Chinese national standard (CNS > A4 Huige (210 * 297 mm) -11 -V. Description of the invention (?) The increase of the ratio a / b of the luminous brightness b of the blue phosphor can increase the luminous brightness of red. On the other hand, in order to expand the color reproduction range, it is necessary to make red emit light. It is necessary that the chromaticity 値 X be increased above 0 · 6 1 2. In order to meet this requirement, it is known that the ratio of the luminous brightness a from the red phosphor and the luminous brightness b from the blue phosphor is set to 1.40 or more. In the form of the above-mentioned embodiment, the light-absorbing layer with the phosphor layer as a matrix and the light-emitting layers regularly arranged in the circular gap of the light-absorbing layer emit blue, green, and red fluorescent light, respectively. The color image tube formed by the body point is also described as an example with a color image tube provided with a color filter between the phosphor point and the panel. However, the invention is also applicable to the stripe-shaped phosphor layer. The light absorber layer and the gaps between the light absorber layer are regularly arranged. The color image tube that can emit blue, green, and red phosphor stripes, and these color image tubes with color filters between the phosphor stripes and the panel have the same effect. The same effect can also be obtained for color image tubes that do not have the above-mentioned matrix-shaped or striped-shaped light-absorbing layer. Printed by the Cooperative Co., Ltd. of the Intellectual Property Bureau of the Ministry of Economic Affairs as described above, according to the present invention, In the color image tube of the phosphor layer formed by the phosphor, the green phosphor, and the red phosphor, the ratio a / b of the luminous brightness a from the red phosphor to the luminous brightness b from the blue phosphor is a / b It is 1.40 or more, so that the color purity of red can be improved without lowering the brightness of the phosphor layer, and a color image tube with a wide color reproduction range can also be formed. This paper standard applies to China National Standard (CNS) A4 Specifications (210 X 297 gong) -12- Printed by the Consumers ’Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs A7 B7 V. Description of the Invention 0 ○ Brief Description of Drawings Figure 1 is a color image tube showing one embodiment of the present invention Sectional view of the structure. Figure 2 A FIG. 2B is a plan view of a configuration example of the phosphor layer of the color image tube. FIG. 2B is a cross-sectional view of a configuration example of the phosphor layer of the color image tube. FIG. Fig. 4 A is a diagram showing an example of the spectral reflectance of the blue light filter shown in Fig. 3, and 4 B is a diagram showing an example of the spectral reflectance of the green light filter shown in Fig. 3 Fig. 4C shows an example of the spectral reflectance of the red light calender shown in Fig. 3. Figs. 5 (a) to 5 (g) show the formation of the phosphor layer shown in Fig. 2. Diagram of the method. Fig. 6 shows the relationship between the ratio of the luminous brightness of the red phosphor and the luminous brightness of the blue phosphor and the chromaticity of the red phosphor to the X constituting the phosphor layer. 2: Funnel 3: Paper neck This paper is suitable for the National Standard (CNS) A4 specification (210 X 297 male *)-13- (please read the “Fang Code on the back of the book to buy the book”)

Printed by Shellfish Consumer Cooperative of Intellectual Property Bureau of the Ministry of Economic Affairs 5. Description of invention (11456 .6 B, G, R: 789 10 1 1 B, G, R 1 2 B, G, R 16 17: 18 192 0: A7 _B7 ) Peripheral phosphor layer shielding cover Electron beam Shielding deflection device in electron gun Light absorbing layer: Phosphor point: Color filter Photoresist electron beam passing hole Anti-light agent coating layer cylindrical gap Phosphor slurry layer {Please read the precautions on the back before filling in this page:

1 Mi I This paper size is applicable to China National Standard (CNS) A4 specifications (210 * 297 male *) -14-

Claims (1)

A8 B8 C8 D8 38S911 6. Scope of patent application 1. A color image tube, which is characterized by having: a light-transmitting panel, and a blue-emitting phosphor provided on the inner surface of the panel ), A green light emitting phosphor (a green-emitting phosphor) and a red light emitting phosphor (a red-emitting phosphor) c light layer formed by the c camp, the above-mentioned red fluorescent body luminous brightness a and the above-mentioned blue fluorescent body The ratio a / b of the luminous brightness b is 1.40 or more. 2. The color image tube as described in item 1 of the Kang-Mu-Ming range, wherein the blue phosphor is made of 0.015 wt% Ag or 0.8 wt% of ZnS: Ag, the above Red fluorescent worm E ί α concentration of 3.5% by weight or even 6.1% by weight 2Y2O2S: Eu made of. 3. The color image tube according to item 1 or item 2 of the scope of patent application, wherein a color filter is interposed between the phosphor layer and the panel. — — — — — — — — — — — R · 111! 111 til · — — — — — (Please fill in this page first after reading the “unexpected matters on the back side”) Employees of the Ministry of Economic Affairs, Intellectual Property Bureau, Consumer Consumption Cooperation Printed paper with “degree” & Chinese national standard (CNS> A4 size (210 X 297 mm) • 15-