KR20050023597A - Gun For CRT - Google Patents

Abstract

PURPOSE: An electron gun is provided to achieve improved luminance by decreasing the blanking voltage of a cathode and extend the lifespan of the cathode and improve resolution by increasing the size of electron beam passing hole of a control electrode. CONSTITUTION: An electron gun comprises a cathode for radiating electron beams; a triode unit including a control electrode and an accelerating electrode for controlling and accelerating electron beams; and a main lens including a focusing electrode for accelerating electron beams on a screen, and an anode electrode. The ratio(a/b) of the vertical length of the beam passing hole of the control electrode to the horizontal length of the beam passing hole of the control electrode satisfies the range of 0.68<=a/b<=0.74, and the ratio(d/c) of the horizontal length of the beam passing hole of the accelerating electrode to the vertical length of the beam passing hole of the accelerating electrode satisfies the range of 1.02<=d/c<=1.2, wherein a is the horizontal length of the beam passing hole of the control electrode, b is the vertical length of the beam passing hole of the control electrode, c is the horizontal length of the beam passing hole of the accelerating electrode, and d is the vertical length of the beam passing hole of the accelerating electrode.

Description

Electron gun for cathode ray tube {Gun For CRT}

The present invention relates to an electron gun for a cathode ray tube, and more particularly, it is possible to improve the lifetime characteristics of the cathode by changing the electron beam through hole sizes of the control electrode and the acceleration electrode disposed in the electron gun, and at the same time to realize the high luminance and high resolution of the cathode ray tube. The present invention relates to an electron gun for a cathode ray tube.

In general, as shown in FIGS. 1 and 2, the electron gun 5 mounted on the cathode ray tube includes three independent cathodes 8, a control electrode 9 spaced apart from the cathode 8, and the control electrode ( The acceleration electrode 10 and the third grid electrode 11, the fourth grid electrode 12, the focusing electrode 13, and the anode electrode 14 which are arranged at a predetermined interval from 9).

A shield having a bulb space contact (BSC) 16 attached to the upper portion of the anode electrode 14 to electrically connect the electron gun to the funnel 3 of the cathode ray tube, and to fix the electron gun to the neck portion 7 of the funnel. The cup 15 is installed.

The electron gun configured as described above emits electrons from the cathode 8, which is formed by a beam, controlled by the control electrode 9, accelerated by the acceleration electrode 10, and formed of the third grid electrode 11 and the third electrode. The primary focus is largely by a pre-focus lens formed by the potential difference between the four-grid electrode 12 and the focusing electrode 13, and the voltage applied to the focusing electrode 13 and the anode electrode 14. The light is focused and accelerated while passing through the main lens formed by the difference of the light, passing through the electron beam passing hole of the shadow mask 2 provided inside the screen 1, and striking the fluorescent surface 1a of the screen to emit light.

At this time, the electron beam 4 is deflected to the entire screen by a deflection yoke 6 provided outside the neck of the funnel 3 and is focused at one point.

Meanwhile, as shown in FIG. 3, the control electrode 9, which is one of the triodes, has a beam passing hole D of a predetermined size, and is disposed while maintaining a constant distance d1 from the cathode 8. The acceleration electrode 10 is disposed in a state of maintaining a predetermined distance d2 from the control electrode 9.

 At this time, the third grid electrode 11 and the focusing electrode 13 of the electron gun are typically applied to 6000v ~ 10000v, the acceleration electrode 10 and the fourth grid electrode 12 has the same potential, A voltage of 300v to 1000v is applied.

Equation 1) shows the bright point elimination voltage Ekco for controlling the amount of current in the cathode ray tube.

Equation 1)

In Equation 1), k is a proportional constant, d1 is the gap between the cathode and the control electrode, d2 is the gap between the control electrode and the acceleration electrode, G ₁ t is the thickness around the beam through hole of the control electrode, D is the beam passing through the control electrode The diameter of the ball, Ec2, represents the voltage applied to the acceleration electrode.

In general, when the voltage of the accelerating electrode is applied as a standard of 260v to represent the point of elimination voltage Ekco, the point of elimination voltage Ekco of the cathode ray tube for color monitor is approximately 55v.

4 shows an image signal waveform voltage applied to the cathode of the electron gun. The electrons are not emitted at the bright point elimination voltage Ekco, and the current amount is controlled according to the magnitude of the driving voltage Ed at a voltage below that.

In this case, the driving voltage Ed is generally expressed as Ed = Ekco-Ek, where Ek is a voltage applied to the cathode.

Recently, due to the rapid development of the Internet and video media, the tendency of watching video content through a computer monitor is increasing. However, a computer monitor has an inferior problem in viewing because the brightness characteristic of the screen brightness is worse than that of a general TV.

This is because the color cathode ray tube for monitor has a smaller amount of current emitted from the cathode than that of a normal TV.

FIG. 5 shows the amount of current Ik generated according to the driving voltage applied to the cathode having the intrinsic bright point elimination voltage Ekco.

In FIG. 5, when 600v is applied to the accelerating electrode 10 as a standard, the bright point decay voltage Ekco is 110v, and it can be seen that the current amount is about half smaller than that when the bright point voltage Ekco is 70v. .

In the related art, as shown in FIG. 5, the brightness of the flash point is reduced by using the inversely proportional amount of the point voltage and the amount of current.

That is, in Equation 1), d1, which is the distance between the cathode and the control electrode, was increased, and D, the beam passage hole diameter of the control electrode, was reduced to have a high brightness condition.

However, as described above, reducing the diameter of the beam passing hole of the control electrode increases the current density of the cathode, which accelerates the evaporation of electron-emitting materials such as barium constituting the cathode, thereby shortening the lifetime of the cathode. .

For this reason, conventionally, the driving voltage, which is another factor influencing the amount of current, is increased rather than reducing the bright point erase voltage.

However, there is another problem that the price increases to increase the driving voltage at the high frequency of the color cathode ray tube for the monitor.

The present invention is to solve such a problem in the prior art, to improve the brightness characteristics by reducing the voltage point of the cathode of the electron gun cathode, and to improve the life of the cathode by increasing the beam through hole area of the control electrode than the conventional In addition, the object of the present invention is to provide an electron gun for cathode ray tubes that can improve resolution characteristics.

Technical means of the present invention for achieving the above object is a three-pole portion consisting of a plurality of in-line cathode for emitting an electron beam, a control electrode and an acceleration electrode for controlling and accelerating the electron beam, and focusing the electron beam on the screen An electron gun for a cathode ray tube including a main lens formed of a focusing electrode and an anode electrode, wherein the horizontal length of the beam passing hole of the control electrode is a, the vertical length is b, and the horizontal length of the beam passing hole of the accelerating electrode is c. When the length is d, the ratio (a / b) of the length of the beam through hole to the length of the beam through hole of the control electrode satisfies 0.68 ≦ a / b ≦ 0.74, and the length of the beam through hole of the acceleration electrode is And the ratio d / c of the longitudinal length of the contrast beam passing hole satisfies the range of 1.02 ≦ d / c ≦ 1.2.

Preferably, the beam passing hole horizontal length (c) of the accelerating electrode is greater than or equal to the beam passing hole vertical length (b) of the control electrode, and the beam passing hole vertical length (d) of the accelerating electrode is formed of the control electrode. It is to be formed to be greater than or equal to the beam through hole width (a).

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the electron gun of the present invention comprises a plurality of in-line cathodes for emitting an electron beam, a triode consisting of a control electrode and an acceleration electrode for controlling and accelerating the electron beam, a focusing electrode for focusing the electron beam on a screen, It includes a main lens formed of an anode electrode.

6 shows the shape of the control electrode and the acceleration electrode according to the present invention.

As shown in FIG. 6, the control electrode and the acceleration electrode have electron beam through holes through which R, G, and B electron beams can pass.

As described above, the size of the beam passing holes formed in the control electrode and the acceleration electrode affects the bright spot voltage. When the horizontal length of the beam passing holes of the control electrode is a and the vertical length is b, the control electrode The smaller the ratio (a / b) of the transverse length to the transverse length of the beam through hole is, the lower the point elimination voltage of the shape having the larger slope as shown in FIG.

This makes it possible to emit a large amount of current at a low driving voltage, thereby improving brightness.

Therefore, it will be efficient to reduce the value of a / b by increasing the beam passage hole horizontal length of the control electrode.

However, when the width of the beam passing hole of the control electrode is increased, the spot size at the center of the screen is increased, resulting in a problem of lowering the resolution.

This problem can be solved by adjusting the beam through hole size of the acceleration electrode as shown in Table 1 below.

Table 1 shows the electron beam spot size according to the beam transmission hole size of the control electrode and the beam transmission hole size of the acceleration electrode.

Example Beam transmission hole size of control electrode (mm) Beam penetration hole size of acceleration electrode (mm) Spot size {center part (mm)} Horizontal (b) Portrait (a) Thickness (G ₁ t) (a / b) Horizontal (c) Portrait (d) Thickness (G ₂ t) (d / c) Horizontal (h) Vertical (v) One 0.40 0.34 0.09 0.85 0.47 0.44 0.55 0.94 0.55 0.87 2 0.40 0.34 0.09 0.85 0.47 0.44 0.55 0.94 0.70 0.50 3 0.40 0.34 0.09 0.85 0.47 0.48 0.55 1.02 0.61 0.63 4 0.50 0.34 0.09 0.68 0.47 0.48 0.55 1.02 0.60 0.69 5 0.50 0.34 0.09 0.68 0.47 0.52 0.55 1.11 0.56 0.54 6 0.50 0.34 0.09 0.68 0.47 0.52 0.55 1.18 0.53 0.44 7 0.50 0.34 0.09 0.68 0.47 0.52 0.50 1.11 0.59 0.50 8 0.50 0.34 0.09 0.68 0.47 0.52 0.50 1.11 0.59 0.47 9 0.50 0.34 0.09 0.68 0.44 0.52 0.50 1.18 0.51 0.43 10 0.48 0.34 0.09 0.71 0.44 0.48 0.50 1.09 0.60 0.49 11 0.48 0.34 0.09 0.71 0.46 0.50 0.50 1.09 0.57 0.50 12 0.48 0.34 0.09 0.71 0.46 0.52 0.50 1.13 0.55 0.43 13 0.46 0.34 0.09 0.74 0.40 0.48 0.50 1.20 0.46 0.55

In general, when the horizontal size (b) of the control electrode is 0.37 mm or more in the color cathode ray tube for a monitor, the resolution of the cathode ray tube becomes larger than the range of 0.50 to 0.65 mm, which is an electron beam spot size capable of high resolution. It gets worse.

According to the present invention, even when the horizontal size of the beam transmission hole of the control electrode is larger than 0.37 mm, the horizontal length of the beam through hole of the control electrode is referred to as a and the vertical length is b as shown in Table 1 above. When the length is c and the vertical length is d, the ratio (a / b) of the horizontal length of the beam through hole to the vertical length of the beam through hole of the control electrode satisfies 0.68 ≤ a / b ≤ 0.74, and the beam passing through the acceleration electrode When the ratio (d / c) of the vertical length of the beam through hole to the hole length satisfies the range of 1.02 ≤ d / c ≤ 1.2, the electron beam spot size appearing on the screen satisfies the range of 0.50 ~ 0.65mm, It is possible to improve the luminance characteristic and the resolution characteristic by increasing the amount of current at the same time and reducing the spot size.

At this time, the beam passing hole horizontal length (c) of the acceleration electrode is formed to be greater than or equal to the beam passing hole vertical length (b) of the control electrode, and the beam passing hole vertical length (d) of the acceleration electrode is the length of the control electrode. It is preferable to form the beam passage hole greater than or equal to the length (a).

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above, the present invention can improve the brightness characteristics by reducing the bright point elimination voltage of the cathode for the electron gun, and improve the lifespan of the cathode by improving the beam pass hole area of the control electrode more than before, and at the same time improve the resolution characteristics. It has an effect.

1 schematically shows a typical colored cathode ray tube;

Figure 2 is a view showing the shape of an electron gun for a typical cathode ray tube.

Figure 3 is a schematic view showing a triode of a conventional electron gun.

4 is a diagram showing a video signal waveform voltage applied to a cathode of an electron gun.

FIG. 5 is a diagram showing an amount of current Ik generated according to a driving voltage applied to a cathode having an intrinsic bright point elimination voltage Ekco.

Figure 6 is a view showing the electron beam through hole shape of the control electrode and the acceleration electrode.

FIG. 7 is a diagram showing an amount of current Ik generated according to a driving voltage in a cathode having a bright point elimination voltage Ekco according to the electron beam through hole size of a control electrode.

***** Explanation of symbols for the main parts of the drawing *****

1: screen 2: shadow mask

3: funnel 4: electron beam

5: electron gun 6: deflection yoke

7: Neck part 8: cathode

9: control electrode 10: acceleration electrode

11: third grid electrode 12: fourth grid electrode

13: focusing electrode 14: anode electrode

15: Shield Cup 16: BSC

Claims (2)

A main lens formed of a plurality of in-line cathodes for emitting an electron beam, a triode consisting of a control electrode and an acceleration electrode for controlling and accelerating the electron beam, a focusing electrode and an anode electrode for focusing the electron beam on a screen In the electron beam gun for a cathode ray tube, When the horizontal length of the beam through hole of the control electrode is a, the vertical length is b, and the horizontal length of the beam through hole of the acceleration electrode is c and the vertical length is d, the beam through hole is compared with the vertical length of the beam through hole of the control electrode. The ratio of the horizontal length (a / b) satisfies 0.68 ≦ a / b ≦ 0.74, and the ratio of the vertical length of the beam through hole to the horizontal length of the beam through hole (d / c) of the acceleration electrode is 1.02 ≦ d / c ≦ 1.2 Electron gun for cathode ray tube, characterized by satisfying the range of. The method of claim 1, The horizontal length (c) of the beam passing hole of the accelerating electrode is greater than or equal to the vertical length (b) of the beam passing hole of the control electrode, and the vertical length (d) of the beam passing hole of the accelerating electrode is the beam passing hole of the control electrode. An electron gun for a cathode ray tube, characterized in that formed in greater than or equal to the width (a).