TW200303569A - Structure of electron gun for color cathode ray tube - Google Patents

Abstract

Disclosed is a structure of a an electron gun for a color cathode ray tube capable of reducing a drive voltage by creating an optimum relation among a cathode, a first electrode, and a second electrode mounted in the electron gun, and preventing degradation in responsiveness to input signals on a high-resolution screen and a focus characteristic.

Description

200303569 V. Description of the invention (1) [Technical field to which the invention belongs] [1] The present invention relates to a color cathode ray tube: the invention particularly relates to an electronic electrical structure of a color cathode ray tube. The structure can produce the best relationship between the cathode, the first electrode, and the type installed on the electronic grabber to reduce the driving voltage and prevent the responsiveness and focusing characteristics of the input signal on ::: [Prior art] Lihua [2] FIG. 1 is a prior art cathode ray tube. FIG. 2 is an external view of the electron grab shown in FIG. I. ^ Structure of Knowledge-Pictures, Snatch-Pictures 1 and 2 provide more information about the first-electrode, first electrode (G2) 65, third electrode (G3) 66, and fourth electrode separated from the cathode 62 by a predetermined distance. Γ, 6 :: a fifth electrode (W68, and a sixth electrode (G6) l /, the electrode system is arranged along the axis of the ray tube (or a straight line)), and the first electrodes 64 are arranged at a fixed pitch; among them, the last An electrode, that is, the sixth electrode 69, is provided with a shield cover 70 fixed with a bulb space contact (BSC) 71, which is used to conduct the electron gun and the cathode edge. In the neck 2 of the funnel 2; Γ '[4] In addition, the neck 2a of the funnel 2 equipped with an electronic grab is equipped with a deflection yoke 4 on the outside, which can deflect the electron beam 5 onto the entire fluorescent screen. [5] ] According to the above structure, when the built-in amplifier 63 of the cathode 62 uses short electrons (that is, the electron beam), the first electrode M and the second electrode μ

Page 5 200303569 V. Description of the invention (2) The pre-focusing lens is converged, and then the front main lens formed by the potential difference between the third electrode 66, the fourth electrode μ, and the fifth electrode 68 is converged, and finally passes through the fifth electrode When the main lens formed with a potential difference between the 68 and the sixth electrode 69, they converge and accelerate again.

If [6] Basically, when the electron beam 5 is deflected by the deflection yoke 4 over the entire fluorescent screen and hits the fluorescent screen la formed on the inner surface of the panel i through the shadow mask 3 spaced a predetermined distance from the panel 丨, An image will be formed on the screen. [7] FIG. 3 illustrates the structure of a part of the electron gun that forms an electron beam. [8] As shown in FIGS. 1 to 3, the electron beam 5 is formed on the cathode 62, the first electrode 64 and the second to fourth electrodes π, 66, and 67 separated by a predetermined distance from the cathode. Generally, the intensity of the electron beam 5 is modulated based on the image signals applied from an external driving circuit 30, that is, red (Sr), green (Sg), and blue (Sb). [9] As mentioned above, the position of the first electrode 64 is separated from the cathode 62 by a predetermined distance. The first electrode 64 is provided with an electron beam through hole having a diameter d. In addition, an object point 28 is formed between the first electrode 64 and the second electrode 65 spaced by a fixed distance B. When one [1 1] applies a fixed electricity sister in the range of 40V to 100V to the second electrode 65: the heater δ3 heats the cathode (: 丨 2; therefore, the cathode emits electrons. The emitted The electrons are accelerated toward the first electrode, and three electron beams 5 are formed therein. These three electron beams 5 pass through the electron beam through holes 64 on the first electrode 64 and then pass through the electron beam through holes on the second electrode 65 65A. Later, the ternary electron beam 5 is initially converged by the prefocus lens 4 q formed between the second electrode and the third electrode 66, which is applied with a high voltage of 5 to 101.

Page 6 200303569 V. Description of the invention (3) [1 2] The diameter of the prefocus lens 40 or the prefocus lens is the size of the electron beam through hole 64A of the first electrode 64 and the electron beam through hole of the second electrode 65. The size of 65A, the thickness τ of the first electrode 64, and the gap B between the first and second electrodes 64, 65 are controlled. [13] In addition, a front main lens 41 is formed between the third electrode 66 and the fourth electrode 67. [1 4] FIG. 4 shows another prior art cathode ray tube 'six τ 々 step two electrodes especially including an embossed portion to enhance the function of the prefocus lens [15] For example, Japanese Patent Publication 1 99 9 — 288664 A type of cathode ray officer disclosed by No. 6 includes an embossed portion 6 5 C for adjusting the gap between the second electrode 65 and the third electrode 66, thereby enhancing the role of the prefocus lens, and based on the Avoid the difficulty of assembly or deterioration of assembly accuracy in a limited livestock system without the need for additional parts. [j6] To be more specific, the second electrode 七 is an embossed portion 65c having a degree of seven near the electron beam through hole 65A, and a groove portion 65B having a predetermined degree tl-t2 is additionally provided to push 贲 2 soil. Γ171 s. To improve the focusing characteristics of the electron beam. a I έ # π ’The difference between the driving voltage and the cut-off voltage is as follows. However, the two-color fluorescent substance ί = the dynamic voltage is applied via the short pin 61, and the difference occurs simultaneously with the deflection. Therefore, the amount of electricity generated is controlled by it. At this time:-the voltage of the electron beam 5 emitted from the cathode 62 is called the cut-off voltage. ; Π :, the electric point before the cathode 62 emits), the wearing stop voltage can be obtained. Tian "The brightness of the screen is at zero level (dark [1 8], in short, wearing stop voltage i") is expressed by the following equation:

200303569 V. Description of the invention (4) [19] Cut-off voltage = Kx (S3 / CxTxB) xVg2 ... Equation (ι) [20] In the above equation, K is a proportional constant; S is the area of the electron beam through hole 64A on the first electrode 64; C is the gap between the cathode 62 and the first electrode 64; T is the thickness of the electron beam through hole 64A on the first electrode 64; B is the first electrode 64 And the second electrode 65; vg2 is the applied voltage of the second electrode 65. [2 1] The applied voltage of the first electrode 65 is 260 V, and the cut-off voltage of a color monitor cathode ray tube is about 5 5 V.

[22] According to Japanese Patent Publication No. 53-1 88 66, the color cathode-ray tube of a color television usually has a first electrode with a diameter of 0.6 minutes, and the cathode-ray tube, especially the data processing monitor ( For example, a cathode ray tube in a computer) has a driving voltage of about 50V and a current capacity of the cathode emitting about 0.3 m A. [2 3] When the fluorescent screen of the cathode ray tube is at its recommended brightness level, that is, 100cd / m2, it corresponds to the above. [24] When the brightness value, resolution value and contrast value are substantially high, the color cathode ray tube can obtain the desired display area. [2 5] Therefore, a monitor cathode ray tube that requires all of the above features

Words, Lou must shrink at high brightness + electronic spot size and increase the number of pixels ’to coincide with the increase in the dot pitch resolution and the extension of the display screen of each color constituting the fluorescent screen. [2 6] In order to reduce the size of the beam spot of the electron beam more effectively, the electron beam through hole of the first electrode 64 or an adjacent electrode can be made smaller, and the electrodes can be separated with a better interval to thereby reduce the projected object point. 28 diameter, and increase cathode 62

200303569 V. Description of the invention (5) Current density. [27] However, when more heat or thermal energy (Joules) is applied, the current density of the cathode will increase ', thus causing the evaporation of electron-emitting substances (such as barium) in the corresponding cathode 62. In short, if the cathode capacity is degraded, the life of the cathode ray tube is also shortened. [28] In addition, the high resolution of the phosphor dot pitch and the increase in the number of display screens (or towels) in response to the extension of the fluorescent screen, in vain deterioration of the electron beam transmission of the shadow mask 2 ° Although some people have made the cathode emit more The current is used to maintain the desired brightness of the fluorescent screen, but this shortens the life of the cathode ray tube more quickly in vain. At the same time, in order to increase the display frame, the frequency of the driving voltage applied to the cathode to amplify the image signal is often increased. However, using this method, the driving voltage will modulate the amplitude of the video signal. 〆 [30] For example, suppose that the m pixels corresponding to 128 lines of 1,024 lines must be displayed as the number of 2M pixels corresponding to 1,600 points and ΐ200 lines. Then, you must set the clock frequency of a video bandwidth in the range of 1 50-2 0 MHz. [31] However, in the circuit frequency characteristics, the driving voltage of the video signal amplitude is limited, which is limited. The driving voltage for obtaining the desired brightness of the fluorescent screen is shown at M2 / FIG. 1. Such as meat κ Qian said Yu Xiang Kuan t when the faction fell on! 5 0 ～ 2 0 () _ 围 of Μϋζ dual purpose. To get better screen brightness ... ^ [33] Usually 'driving voltage can be expressed by the following equation ... [34] driving voltage = cut-off voltage-cathode voltage ... Equation (2) [35] Figure 6 graphically shows the relationship between current capacity and drive / cut-off voltage

200303569 V. Description of Invention (6) Department. As shown in the figure, it is assumed that when the driving voltage is the same, the current capacity is inversely proportional to the wearing voltage. (That is, the lower the load voltage, the more current is emitted.) [3 6] That is, when the driving voltage is the same, when the cut-off voltage is 30 volts instead of 50V, the more current is emitted. [37] When the above is applied to a more practical level, one can easily think that the brightness of a computer monitor is generally lower than the brightness of a television. Despite the rapid development of the Internet and video media systems over the past few decades, more people are now watching computer screens through computer monitors; this problem has not yet been resolved. [38] More specifically, the brightness of a cathode ray tube is usually dependent on the current capacity of the electron grab. As previously mentioned, when 260V is applied to the two electrodes of a cathode ray tube of a monitor, its cut-off voltage is usually in the range of 50V to 55V, and this value is obviously higher than 30V. Therefore, as shown in FIG. 6, when the cut-off voltage is 50V ~ 55V, the current capacity emitted is relatively dark. The image is relatively dark when the cut-off voltage is 30V. … "Low, the viewer must endure viewing [39] Of course, some monitor manufacturers try to apply a driving voltage to the cathode in order to increase the current capacity. But very not 3 [4.] Figure 7: Say an input signal The response signal is delayed between the two cases. For example, Figure 7 shows that when the video bandwidth is at 150MHz, when the response signal rises or falls, it will be sent as (td). 丁 丨 J 姓 延 [41 ] Similarly 'FIG. 8 shows when the clock frequency of a video bandwidth is 200303569 5. Explanation of the invention (7) =:' When the response signal rises or (two: same as in Figure 7 *, and) _z the clock said = Daytime = Deterioration, and at the same time, some amplitudes are lost, and the advantage of the smaller electron beam spot is conveyed to the cathode, but [43] may not be reflected in the resolution. Horizontal deflection frequency) Affected vertical lines. As a result, the Y frequency (ie, deteriorates, and the bright lines flow in the scanning direction. At the same time, the brightness of the straight line [44], at the same time, is directly affected by the relatively low frequency (that is, the vertical horizontal line, which obtains a sufficient driving voltage). . (Frequency) influence difference [45 廿] '=' ί This will increase The difference in brightness between straight lines and horizontal lines leads to unnatural images.] Degree [46]-Generally speaking, the driving characteristics of a color cathode ray tube is that the cathode voltage of electron% is set to low to reduce the driving voltage. Amplitude. [4 7] However, in this case, the current density of the cathode also decreases. Therefore, the spot diameter of the electron beam on the fluorescent screen becomes longer, and the resolution deteriorates. [48] In an attempt to solve the above problem , Korean Patent No. 3008 366 discloses a zero-form D 3 £ Π-5 4 B f 0 · m fτ Γ read to see FIG. 3) β Among them, the electron beam through hole 64A on the electrode 64 in the vertical and horizontal directions The average straight / diameter 'B is the gap between the electron beam through hole 64A on the first electrode 64 and the electron beam through hole 6 5 A on the second electrode 65, and T is the electron beam through hole 6 4 Α on the first electrode 64. [49] This still creates a problem, especially when the first electrode 64 and the " " Ϊ 11 I '" ~ 200303569, the invention description (8) _ ί the gap between the electric = to increase to meet In the above equation, that is, this type of = will increase the emission angle at the object point 28, so Make the electron beam light scoring: [Abstract] [50] The purpose of the present invention is to provide at least and at least the following advantages. ^ Σ pass or disadvantage [5 1] Therefore, the purpose of the present invention is the electronic tube grabbing This kind of -black cathode emission does not generate additional cost, thereby increasing the supply of low cut-off voltage and obtaining the desired focusing characteristics, that is, the current capacity under the voltage can meet high resolution. P is the same, low In the current region, the present invention also aims to provide an electron grabbing structure. This kind of electron grabbing = cathode ray officer, the first: electrode, and the second electrode produces cathode pressure within the electron grabbing, and can prevent high resolution. In order to reduce the degradation of the driving electrofocus characteristics, the response of the input signal on the screen and the convergence [53] In order to achieve the foregoing and 1 points described as the structure of the electron gun for π color cathode ray tubes, this paper The invention provides a sub-snapshot ... The fluorescent screen: a fluorescent screen, an art mask, and a pixel; the shadow mask is a cathode that emits three electron beams of the three-color painting of the two colors on the narrow side adjacent to the fluorescent screen, One pole " Hai electronic grab includes-lens forming device, Apparatus spoon ", and a second electrode, and a plurality of electrodes on the main screen. Among them, ^ 1: focus the three electron beams on the fluorescent light 〇6_2 to 〇 · 12mm2 The range of the electron beam through hole of the electrode is 〇 · The gap between the first electrode and the second electrode 200303569

Between 0.12mm and 0.3mm. Part of the patent application items and advantages will be attached to those with ordinary skills. [54] Other advantages of the present invention: ^ ^ ^ Compensation: points, purpose, and characteristics, the following description states, some parts ^ ^ ^ 1 仂 is to understand such technologies when reviewing or implementing the present invention of. According to the special point in the paragraph, the present invention can be realized and obtained. [Embodiment] [72] The following describes the electronic structure of the color cathode ray tube according to the present invention in detail with reference to the drawings. Che Youjia Bei detailed example

[73] If the current capacity flowing in the cathode is fixed, there are several ways to increase the current density of the cathode. For example, the potential of the electrode can be increased, or the position of the first electrode can be closer to the cathode, or the size of the electron beam through hole of the first electrode can be reduced, or the gap (gap) between the first electrode and the second electrode can be narrowed, or the The two electrodes become thin. This will reduce the size of the light spots formed on the screen and increase the current density. [74] According to the above methods, the object of the present invention is to reduce the spot size by increasing the current density and maintaining a fixed current capacity;

Dynamic voltage; and optimizing the emission angle toward the second electrode, thereby improving the focusing characteristics. S

: b: _ y a The graph shows the situation where a spot size changes with the thickness of the second electrode. [7 6] Please refer to FIG. 4 and FIG. 9. When the thickness of the second electrode 65 is reduced, the prefocus lens (40 in FIG. 3) is strengthened, the emission angle is reduced, and the current density is increased. [7 7] However, Figure 9 also shows that when the second electrode becomes thinner, the light

Page 13 200303569 V. Description of the invention (ίο) The point becomes smaller at first, but after a certain range [78] According to the findings, when the emission angle is two before the incident ^ between 36 mrad and 42 mrad (Millard) In other words, when the other range is 0.3mm, the spot size is the smallest. And the thickness of the second electrode 65 is low [7 9] However, since the thickness of the second electrode is 5mm, the thickness of the raw material cannot be reduced (τ〇Λ because Λ is lower because of: physical deformation or change in thermal expansion characteristics. This is / ,,,,. When the gap between the electrode and the 65th pole is changed, the cut-off voltage will also reduce the electrode 64 64〇] Because, in order to prevent these problems, the pressure on the electrode 65 is preferably The depth of the printed part 6 5 C. The text sighs that the second [8 1] Figure 10 shows two necessary techniques on the second electrode w. For example, first use the two printed parts 6 5 C type mb), In order to obtain the required pre-scale; the size of the head punching material, as shown in Figure D, and the size, as shown in Figure 10 (c); [8 2] More specifically, the first punch? / 、 The groove portion 65B is shown in FIG. 10 (d). Bund,, ′, 〆 to form a concave structure will be pushed in the direction of the arrow. ..., 'According to the nature of the metal, the metal knot [83] is pushed back in the direction of arrow P when the stamped portion 65c is formed by punching. , 77, ’65C, the depth of which must not be too large, and the size of the embossed part which minimizes the size is a problem. How does this work in the part manufacturing process?丨 [85] That is, if the deep Lu structure of the embossed portion 65c is stamped more severely, and () it is sloppy, the metal stands on the boundary surface forming the groove portion 65B 200303569 as shown in Figure 11 It is shown that the generation of a hole having a depth of about 2 mm deteriorates the focusing characteristics. [8 6] The above phenomenon usually occurs when the forging amount exceeds 40% of the thickness of the raw material. [87] Therefore, assuming that the thickness of the raw material of the second electrode 65 is τ〇, the following relationship ·· t £ 0.4xTo result, this orifice will

The depth of the embossed portion 65C formed on the pole 65 is t. Then, it is better to satisfy 0 and t ...] In addition, if the diameter of the embossed portion is ⑼ and the thickness is 卜, the volume of the embossed portion 65C can be expressed as: pxR2xt. Since 2r indicates red

8mm。 (R), green (G), blue (B) gap between the electron beam through holes 65A, so the value must not be greater than 2. 8mm. Snatch A

[89] As described above, the thickness (t) of the embossed portion 65c is preferably less than 40% of the degree (To). Therefore, the maximum volume of the embossed portion can be expressed as: 0 · 784xpxT (mm3). [90] In short, the imprinted portion 65 () formed on the second electrode 65 (:, its capacity fPXR2xt satisfies the following relationship: (PxR2xt) £ 0 · 784xpxT. Assuming there may be a problem in the pattern formation process, then one can be applied The constant value 0.99 is in a more specific range, for example, the volume pxR2xt of the imprinted portion 65C is the largest, and the text η is about .99λ 0 · 784χ: P) α [91] In summary, R, T, and t has the following relationship: R2 £ 〇 · 776 1 6 ^ / ^ ········· Equation (3) [9 2] In case the electrode is formed, the forging amount exceeds the thickness of the raw material by 40% "时; 'The metal structure will inevitably undergo rapid changes under pressure, and an orifice will be created at the text A. To prevent these problems, by minimizing s

200303569 V. Description of the invention (12) The degree of deformation in the metal structure, the value of R can be adjusted. [93] Another method to increase the current density is to make the electrons of the first electrode

The through hole is smaller, or the first and second electrodes are closer to adjust the wearing and stopping voltage. As mentioned earlier, the cut-off voltage can be expressed by the following equation: I

[94] Cut-off voltage = Kx (S3 / CxTxB) xVg2 ... Equation (4) [9 5] In this equation, κ is a proportional constant; s is the first electrode 6 4 Area of the electron beam through hole 64A; C is the gap between the cathode 62 and the first electrode 64; D is the thickness of the electron beam through hole 64A of the first electrode 64; β is the gap between the first electrode 64 and the second electrode 65 ; Vg2 is a voltage applied to the second electrode 65. Figure f) Figure 3) Brother [96] The proportionality constant K is always fixed, and the proper gap between the cathode 62 and the first electrode 64 is about 0 · 1 mm to activate the cathode β 2. [97] In addition, the thickness of the electron beam through hole 64A of the first electrode 64 is set to about 0.1 mm, which takes into account various working conditions in the electronic grabbing process and various possible restrictions when stamping the sample. [98] This indicates the size of the electron beam through hole 64A of the first electrode 64 and the gap β between the first electrode 64 and the second electrode 65, which are the key or substantial factors for controlling the cut-off voltage in the process of the electron gun. "99" Due to the existence of different shapes of the first electrode 64 and the beam passer β4Al, as shown in Fig. 12, the area (s) of the electron beam pass-through hole 64A is mostly calculated. [100] Fig. 13 shows the first electrode The relationship between the area (s) of the β4 electron beam through hole and the spot size at different current capacities. According to the findings, when the area (s) of the first electrode 64 electron beam through hole 64A increases, the spot size becomes smaller than

Circle Page 16 200303569

[101] As shown in the graph of FIG. 13, if the area (S) of the electron beam through hole 64A of the first electrode 64 is less than 0.06 mm2, although a small light spot can be formed, its shape and formation process are very difficult And, the cathode ray tube thus produced may have a problem of life. Therefore, it is impossible to use this case in reality. [102] On the other hand, if the area (S) of the first electrode 64 electron beam through hole 64A is larger than 0.1 2 mm2, the spot size increases rapidly. This is the fatal cause of the low resolution of the color cathode ray officer, and it is extremely difficult to reduce the cutoff voltage. [103] Therefore, an appropriate area (S) of the first electrode 64 electron beam through hole 64A is not less than 0.06 mm2 and not more than 0.12_2. [104] FIG. 14 shows the relationship between the gap between the first and second electrodes and the cut-off voltage according to the area of the first electrode electron beam through hole. [105] As shown in the figure, in order to adjust the cut-off voltage to 30v, when the electron beam area (S) is 0.06 mm2, the gap B between the first electrode 64 and the second electrode 65 should be 0 · 12 mm . Similarly, when the electron beam area s is 0.12 mffl2, the gap B between the first electrode 64 and the second electrode 65 should be 0.3 mm. [106] According to this', by adjusting the first electrode μ electron beam through hole μα: ^ 乂 *… between the electrode and the second electrode 65, it is possible to stop wearing and reduce the voltage to 30V. This means that focusing characteristics that satisfy both the low current region and the south current region resolution are now available. [107] At the same time, the gap c between the cathode 62 and the first electrode 64 should be as small as possible to increase the current density of the cathode. [1 08] However, don't ignore a fact. Activate the cathode in a vacuum ^ ΒΓΐΙΤ 200303569 V. Description of the invention (14) Day f 'It will be heated to a relatively high temperature. In fact, this high temperature is about 14% higher than the cathode temperature obtained using the heater 63 during normal operation. [109] Therefore, to prevent the cathode 62 from expanding due to high heat, the cathode 62 and the first electrode 64 should be separated from each other by a predetermined distance. [11 0] When the cathode 62 is cooled, the proper gap between the first electrode 64 and the cathode 62 is at least 0.1 min or higher. [111] As mentioned earlier, 'reducing the cut-off voltage will also reduce the driving voltage' and thereby increase the current density of the cathode. [112] The typical method used to reduce the cutoff voltage is to keep the potential of the first electrode 64 as low as possible. However, this method has proven to be ineffective ′ because it cannot maintain the desired current density and therefore magnifies the spot size. [113] Another method is to shorten the diameter of the electron beam through hole 64 of the first electrode 64 and maintain the current density. [11 4] In addition, if necessary, the separation distance between the first electrode 64 and the second electrode 65 should be greater than a predetermined distance in order to solve the problem of discharge or leakage caused by the potential difference of the respective applied voltages, or prevent any foreign matter from entering Gap between electrodes. [11 5] FIG. 15 illustrates the relationship between the gap between the first and second electrodes, the diameter of the first r electrode through the east through hole, and the thickness of the first electrode electron beam through hole. [116] In FIG. 15, the vertical axis A indicates the ratio of D3 to D, where d is the average diameter of the first electrode 64 electron beam through hole 64A in the vertical and horizontal directions, and τ is the first electrode 64 electron beam through hole 64A. thickness.

[117] In FIG. 15, the horizontal axis B indicates the first electrode 64 electron beam through hole “A

Page 18 200303569

And the first electrode 65 electron beam through hole 65 A. [Π8] It is preferable that 'β is greater than 0.08_ to prevent discharge or leakage of each electrode caused by the potential difference of the respective applied voltage, and to protect the cathode ray tube from foreign matter of empirical size. [119] In addition, if the cut-off voltage is lower than 80 volts, the parameters a, β, D, and T have a specific relationship to maintain the desired current density: A = D3 / T '100Α £ 154B + 17 That is, D3 £ (1.54B + 0.17) xT ... Equation (5), in the above equation, D is the average of the vertical and horizontal directions of the first electrode 64 electron beam through hole 64A Diameter; τ is the thickness of the first electrode 64 electron beam through hole 64 A, and B is the gap between the first electrode 64 electron beam through hole 64A and the second electrode 65 electron beam through hole 6 5 A. [1 2 0] This equation has been proved to be valid by orbital analysis of the electron beam. [121] In addition, when considering the area of the electron beam through-holes provided on the first electrode 64, the average diameter D of the electron beam through-holes 64a of the first electrode 64 in the vertical and horizontal directions is preferably shorter than 0.4 mm. As shown in Figure 13, this preferred value is most suitable for color cathode-ray tubes for (computer) monitors that require high-resolution images and pixels greater than 2M pixels. —1 “FREE”: In addition, the thickness T of the electric master east through hole S 4 A is adjusted ... to make Zhenluo within the range of 0.06mm to 0.13mm to form a high precision electron beam through hole 64A. More preferably The thickness τ of the electron beam through-hole 64A is 0.1 mm. [123] In summary, if the color cathode-ray tube of a high-resolution display monitor whose number of daylight elements is larger than μdaylight elements maintains the desired polyfluorene characteristics At time, A = D3 / D £ 0.6.…, 200303569

[124] In FIG. 15, the areas satisfying the above relationship are indicated by hatched portions. [125] As long as the A and 8 values are specified in this area, the voltage and focus characteristics can be stopped. Don't, hold [1 26] At the same time, the driving voltage can also be reduced. Therefore, it is now possible to more accurately reproduce an input signal on a fluorescent screen without enlarging the spot size. [1 2 7] Figure 16 illustrates the relationship between the driving voltage and the cathode current. [128] As shown in the figure, if the driving voltage is 40v, the cut-off voltage must be lower than 80V to make the current flowing into a cathode greater than 300mA. [1 2 9] To implement the present invention, a required value must be specified for each parameter. For example, the diameter D of the electron beam through hole 64A of the first electrode 64 is set to 0 · 3_; the thickness T of the electron beam through hole 64A of the first electrode 64 is set to 0 · imm; the applied voltage of the first electrode 64 is set to ov; The diameter of the electron beam through hole 65A of the second electrode 65 is set to 0.37 mm; the applied voltage of the second electrode 65 is set to 600 V; the material thickness To of the second electrode 65 is set to 0.5 mm; the embossed portion 65C of the second electrode 65 The thickness t is set to 0.2 mm; the gap B between the first electrode 64 electron beam through hole 64A and the second electrode 65 electron beam through hole 65A is set to 0 · 12 mm; the radius R of the embossed portion 65C is taken into consideration of the second electrode 65. Processing possible *. *: Gray-; >. ^ Η 1 Ο ′ '> [1 3 0] In the above embodiment, the diameter D of the first electrode 64 electron beam through hole 64A, the first The thickness T of the electron beam through hole 64A of one electrode 64 and the gap B between the electron beam through hole 64A of the first electrode 64 and the electron beam through hole 65A of the second electrode 65 are all in the shaded area, and the cut-off voltage at that time was about 70V. [1 31] Assuming the current capacity in each cathode 62 is 300 m A, then,

200303569 V. Description of the invention (π) The necessary driving voltage is not more than 4〇ν, as shown in Figure 16. [132] Therefore, the brightness of vertical lines above 200 MHz is no longer degraded 'and because the emission angle is at its proper value of 3.8mrad, the spot size is not enlarged. [1 3 3] In short, the color cathode ray tube according to the present invention is electronically grabbed. The low cut-off voltage is realized without additional cost, so the current capacity at a predetermined ° voltage is increased, and the desired focusing characteristics are obtained, that is, high resolution can be satisfied in the low current region of $. n [134] In addition, the reason why the present invention is beneficial to use is that it lies in the fact that the cathode, the first electrode, and the second electrode on the electron gun produce the best, and can reduce the driving voltage and appropriately adjust the emission angle of the prefocus lens. This prevents degradation of the response to the input signal 2 on a high-resolution fluorescent screen with a high deflection frequency (ie, a slow response) and prevents deterioration of the focusing characteristics: [1 35] above although revealing a preferred implementation of the present invention Examples, but those familiar with this technology should understand that the bean shape can be changed without departing from the appended application of the present invention. The spirit disclosed in Jiaming's patent patent [136] The foregoing embodiments and advantages are for example only, i-¾ Shilu: Furnace Dasu called 4-,, M limit for manhole. The description of the present invention is for the purpose of example, and the scope of "Dou. 〇"-贝 "is straightforward. People who are familiar with such technologies can restrict patent claims, modifications, and changes. When requesting exclusivity: understanding a variety of alternatives, the purpose of which is to perform the function described, including: ‘means plus function syntax’ and other equivalent structures. / The structure and structure described in this article are the same. 200303569 Brief description of the drawings [Simplified description of the drawings [5 5] The present invention refers to the following corrections a, and the reference numerals refer to the same elements. The drawings include detailed descriptions, and the same parameters are shown in the figure. [56] FIG. 1 is an explanatory diagram of a prior art cathode-ray tube electronic grab structure ^ 7] FIG. 2 is an external appearance explanatory diagram of the electronic grab shown in FIG. 1; 58] FIG. 3 Illustrate the structure of the electron beam forming part in the electron grab; [59] FIG. 4 illustrates the embossed part formed on the first electrode according to the prior art to enhance the pre-focusing effect; [60] FIG. The driving voltage measured by the screen; [61] Figure 6 shows the relationship between the current capacity and the driving / cut-off voltage in a graph; [62] Figure 7 shows the frequency of an input signal when the clock frequency of a video bandwidth is 50MHz. Delay of response signal in time; [63] Figure 8 shows the delay of response signal of an input signal in time when the clock frequency of a video bandwidth is 2000 MHz; [64] Figure 9 shows The spot size changes depending on the thickness of the second electrode; "6 Η 1 circle i 〇 shows the formation of the embossed part on the second electrode-[66] Figure 11 illustrates the aperture on the boundary surface forming the groove [67] FIG. 12 shows different shapes of electron beam through holes on the first electrode; [68] FIG. 13 shows The table below shows the area on the first electrode via the electron beam spot size and light in a different relationship between the current capacity;. [69] FIG 14 show graphically determined according to a first electrode of the electron beam through holes area '

200303569 The diagram briefly illustrates the relationship between the gap between the first and second electrodes and the cutoff voltage; [7 0] Figure 15 illustrates the gap between the first and second electrodes, the diameter of the first electrode electron beam through hole, and the first The relationship between the thickness of the electrode electron beam through hole; [7 1] Figure 16 illustrates the relationship between the driving voltage and the cathode current in a chart. [Element symbol correspondence table] 1 panel 1 a fluorescent screen 2 funnel 2a funnel neck 28 object points 3 shadow masks ~ 3 0 drive circuit 4 deflection yoke 40 prefocus lens 41 front main lens 5 electron beam 61 short pin 62 cathode · V t: -J 6464 first electrode (G1) 64A first electrode electron beam through hole 65 second electrode (G2) 65A second electrode electron beam through hole 65B second electrode groove

200303569 Brief description of the drawing 65C Second electrode stamping part 66 Third electrode (G3) 66A [Fig. 3] 67 Fourth electrode (G4) 68 Fifth electrode (G5) 69 Sixth electrode (G6) 70 Shield cover 71 Electron tube space contact (BSC) 9 Short pin A The ratio of the cube of the average diameter of the first electrode electron beam through hole in the vertical and horizontal directions to the thickness of the first electrode electron beam through hole a [Fig. 12] b [Fig. 12] B first The gap between the second electrode C The gap between the cathode and the first electrode D The diameter (area) of the first electrode electron beam through hole R The radius r of the second electrode embossed part [Figure 1 2] The second electrode ink? ^ 部 直. # S area of the first electrode electron beam through hole [Fig. 12] T thickness of the first electrode (electron beam through hole) To thickness of the second electrode raw material t thickness of the second electrode imprinting portion [Fig. 4] t scan Time [Figure 5]

Page 24 200303569 Brief description of the drawing t [Fig. 7] tl-12 thickness of the second electrode groove portion Page 25

Claims (1)

200303569 6. Scope of patent application1. A nightmare of a color cathode-ray tube ^^ ^ night cover and-electron gun core sub-gun structure 'includes-camping screen ϊίΠ: three-color pixels on it; The position of the color selection electrode is adjacent to the camping light screen; the second power: grabbing includes-a cathode that can emit three electron beams; the first = pole; and the main lens forming device, including three: a majority of the fluorescent screen Electrodes; and 〇1? °% an electron beam through hole called electrode gas ranging from 0.06_2 to 0.12 mm2, the first electricity;) ¾ 兮 赞 0.1 0.12 to 0.3 off. The gap between the electrode and the second electrode is in the electron gun structure of the color cathode ray tube surrounding item 2. The first electrode is formed with an embossed part. 3. The Π H :: electronic grab structure of the tube 'includes-fluorescent screen,-Qiaohan, and an electronic grab; of which: Κί: bag: glorious film with three-color daylight; a shadow mask as a The color selection electrode should be thunder; its position is adjacent to the fluorescent screen; the electrode and the cathode of the three electron beams; -th -.Λί S:? ^ ^ &Amp; .., a main lens forming device, including three , 坌 ^ # 丄 的 majority of plums: d 0.3.1-the gap between the electrodes _ urgent ^ ... color cathode two shadow masks, and-electronic grab; among them:-fluorescent screen,-the fluorescent screen includes a Fluorescent film with three-color pixels on it; Sixth, the scope of the patent application The shadow mask is a color-selective electrode, and its position adjacent to the delta electron pick-up includes a cathode capable of emitting three electrons, and a thunder plate with a ^ φ Ι-. 釆 cathode; a first forcing pole M 帛An electrode, and the majority of the electrodes in the main lens-shaped first sub-beam focused on the light-emitting screen; including: the thickness of the printed part that can be three (2) of the thickness of the second electrode 10 (11) 1]]) and t, the following relationship: t £ G The electrode is formed in the color cathode ray tube electron of the patent scope item 4, "the gap between the first electrode and the second electrode, ·: 冓" 0.3mm. ㈤ 〇 2mm to 6 · — an electronic shadow mask of a color cathode ray tube, and an electronic grab; wherein: the structure includes a fluorescent screen, the fluorescent screen includes a fluorescent film, which is provided with three The color cover is a color-selective electrode, and its position is adjacent to the labor: When the 2nd electrode is composed of a cathode that can emit three electron beams; the second-electrode and the second-electrode; and the main lens forming device, Including the majority of electrodes that can be focused on the camping light screen by the FR beam; &:- The vertical and average diameter D of the electron beam through hole provided above is flat on the first electrode. The thickness T (mm) of the electron beam through hole is sighed: The gap B (mm) between the electron beam through hole and the beam through hole on the first electrode, the thickness of the raw material of the second electrode, sigh ... 1 mm (mm), and the depth t of the embossed portion on the second electrode, Satisfy the system · D3 £ (1 · 54B + 0 · 17) χΤ and t £ 〇 · 4χΤο. 7. If the color cathode ray structure of the 4th or 6th of the patent application scope is applied, where the electron is the second electrode grabbed A groove 200303569 8. For the structure of patent application No. 丨 and No. 3, in which the embossed part electrode formed on the color cathode-ray tube electronic electrode of item _〃, the material thickness To (mm), and the radius R of the second part (min), to meet the requirements of clothing and embossing on the second electrode 9. If the scope of the patent application is the first T relationship: R2 £ 〇 · 61616xT / t. Grab the structure, wherein the color cathode-ray tube electron (B) fluorescein of the f 弁 or f term is larger than 2M pixels. The red (R), green (0, blue 10) applied on the top, such as the first and the third sub-pattern structures of the scope of the patent application, in which the thunder + ^ or 6 of the color cathode ray tube electric 0.3_. 4 sub & of The thickness of the second electrode is less than 11. As in the patent application scope No. 1, 3, & sub-grab structure, which is applied to more than 200 MHz. Person 12. As in the patent application scope No. 1, 3, 4 sub-gun structure, where, The driving voltage frequency applied to the 40V ° or 6 items of color cathode ray tube electric electron grabbing cathode or the 6 item of color cathode ray tube electronic electron grabbing cathode drive voltage is less than 1 3 · If the scope of patent application is No. 1, 3, 4痞 β τ5 Irregular 谌 Shi 谌, Ganshi—color cathode ray tube of the 6th item,… accounts for 4% “… π r 幵 has a redundancy greater than 100cd / m2. I'i · Ru Ningqing Ridge Publication Garden i ~ 3,4 ρ .Γ -b-shirt color cathode ray tube electricity 0. The current flowing in the cathode is greater than 15 · Such as the scope of the patent application No. 1, 3, 4 痞 R τ5. Industry & ^ Shi 媸., ^ ㊉ and 6 color cathode radiation; 8 () V. The cutoff voltage of the cathode of Dingguan is small 200303569 6. The scope of patent application 16. If the electron gun structure of the color cathode ray tube according to item 1, 3, 4 or 6 of the scope of patent application, the average diameter of the first electrode electron beam through hole is less than 0. 4mm. 17 · If the electron cathode structure of a color cathode ray tube according to item 1, 3, 4 or 6 of the patent application scope, wherein the gap between the cathode and the first electrode is greater than 0.1 mm. Page 29