JP2005043675A - Cathode ray tube, display device using it and image display method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cathode ray tube which can shorten an electron gun, realizes a high frequency drive and can give a high resolution image and to provide a display device and an image display method using the cathode ray tube. <P>SOLUTION: The cathode ray tube is constituted by using a field-emission cold cathode 8 consisting of a semiconductor substrate 1, a conical emitter 4 disposed on the semiconductor substrate 1, an insulating layer 3 and an extractor electrode 2. A control electrode 7 is arranged on the electron emission side of the field-emission cold cathode 8. A direct electric source 6 supplying a constant voltage is connected to each of the control electrode 7 and the extractor electrode 2. A modulation electric source 5 capable of modulation of a supply voltage is connected to the emitter 4. By modulating the potential of the emitter 4 with the modulation electric source 5 in the state that the potentials of the control electrode 7 and the extractor electrode 2 are constant, an emission current is controlled and an image is displayed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cathode ray tube using a field emission cold cathode as an electron source, a display device using the same, and an image display method.

  Conventionally, a hot cathode utilizing a thermionic emission phenomenon has been mainly used as an electron source of a cathode ray tube. On the other hand, in recent years, a cathode ray tube using a field emission cold cathode has been proposed as an electron source of the cathode ray tube (see, for example, Patent Document 1).

  This is because the field emission cold cathode has a feature that it has a higher current density than the hot cathode, and there is a possibility that a high performance cathode ray tube can be realized. Further, a cathode ray tube using a hot cathode has a quality problem that the amount of emission current changes with time due to the change in the distance between the electrodes of the electron gun due to the influence of heat from the heater. On the other hand, a cathode ray tube using a field emission cold cathode does not have a heater, and therefore has an advantage of not causing such a quality problem in principle.

  A typical field emission cold cathode will be described with reference to FIG. FIG. 9 is a partial sectional view showing the configuration of a conventional field emission cold cathode. As shown in FIG. 9, the field emission cold cathode 28 is provided with a plurality of conical emitters 24 for emitting electrons and an insulating layer 23 on a semiconductor substrate 21 formed of silicon or the like, and further, an insulating layer. The lead electrode 22 is provided on the top 23. In addition, a plurality of through holes 23a are formed in the insulating layer 23 to expose the plurality of emitters 24, respectively. A plurality of through holes 22 a are formed in the extraction electrode 22 so as to be aligned with the plurality of through holes 23 a of the insulating layer 23. In the example of FIG. 9, only one emitter 24, the through hole 23 a of the insulating layer 23, and the through hole 22 a of the extraction electrode 22 are illustrated for explanation.

  Further, the cathode ray tube is provided with three field emission cold cathodes shown in FIG. 9 so as to correspond to R, G, and B, respectively. For this reason, three electron beams corresponding to each of R, G, and B are emitted.

  In the field emission cold cathode 28 shown in FIG. 9, if the potential of the extraction electrode 22 is made higher than the potential of the emitter 24, a strong electric field is generated at the tip of the emitter 24. Electrons are emitted and an emission operation is performed.

  The amount of emission current at this time depends on the potential difference between the emitter 24 and the extraction electrode 22. As described in Patent Document 1, the emission current is controlled by changing the potential of the extraction electrode 22 while keeping the potential of the emitter 24 constant. That is, when a field emission cold cathode is used for the cathode ray tube, the potential supplied to the emitter 24 of each of the R, G, B field emission cold cathodes is made constant, while each of the R, G, B field emission cold cathodes is used. The potential of the lead electrode 22 is modulated.

  FIG. 10 is a sectional view showing a schematic configuration of a part of a cathode ray tube using the field emission cold cathode 28 shown in FIG. As shown in FIG. 10, on the electron emission side (screen side) of the field emission cold cathode 28, that is, the traveling direction side of electrons emitted from the emitter (upper side in the figure), a control electrode 27 having a through hole 27a is provided. The openings of the through holes 27a and the openings of the through holes 23a of the insulating layer 23 are arranged so as to be aligned. The control electrode 27 is an electrode closest to the extraction electrode 22 on the electron emission side of the field emission cold cathode 28 in the extraction electrode 22.

  Further, as shown in FIG. 10, a DC power supply 26 for supplying a constant voltage is connected to each of the control electrode 27 and the emitter 24. For this reason, the potential of the control electrode 27 and the potential of the emitter 24 are kept constant. On the other hand, a modulation power source 25 is connected to the extraction electrode 22 so that the potential of the extraction electrode 22 can be modulated.

  As described above, according to the cathode ray tube shown in FIG. 10, since the potential of the extraction electrode 22 can be modulated while the potential of the emitter 24 is kept constant, the amount of emission current can be controlled. .

  Further, in a cathode ray tube using a hot cathode, the distance between the electrodes of the electron gun changes with time due to the heat of the heater, so that the distance between the electrodes is generally at least 70 μm or more. On the other hand, in a cathode ray tube using a field emission cold cathode, since there is no heater, it is not necessary to consider the change with time of the distance between the electrodes, and the distance between the electrodes can be 70 μm or less.

  Furthermore, it is considered that the distance between the electrodes can be shortened by using a microfabrication technique of a semiconductor process. For this reason, if a cathode ray tube is formed using a field emission cold cathode, it is considered that the length of the triode of the electron gun can be shortened and the total length of the electron gun can be shortened.

FIG. 11 is a sectional view showing a schematic configuration of a part of another example of a cathode ray tube using the field emission cold cathode 28 shown in FIG. In the example of FIG. 11, unlike the example of FIG. 10, a modulation power source 25 is connected to the control electrode 27, and potential supply to the control electrode 27 is performed while modulating at a high frequency.
Japanese Patent No. 2982719 (2nd page, FIG. 3, FIG. 4)

  However, when the amount of emission current is controlled by the configuration shown in FIGS. 10 and 11, there is a problem that the potential response of the extraction electrode 22 cannot correspond to the modulation frequency as the modulation frequency increases.

  The dominant factors affecting the potential modulation of the extraction electrode 22 are electrostatic capacitance components at two locations between the extraction electrode 22 and the emitter 24 and between the extraction electrode 22 and the control electrode 27.

  That is, as the modulation frequency increases, the influence of the capacitance generated between the extraction electrode 22 and the control electrode 27 or the emitter 24 becomes more significant, and the potential response of the extraction electrode 22 cannot correspond to the modulation frequency.

  Further, when the distance between the electrodes is shortened, the extraction electrode 22 and the control electrode 27 are formed by micron order processing using a microfabrication technique of a semiconductor process, and the distance between them is set on the micron order. If so, the capacitance component that affects the potential modulation of the extraction electrode 22 becomes large, and the above problem becomes more prominent.

  For this reason, when a conventional field emission cold cathode is used, it is difficult to shorten the total length of the electron gun in the cathode ray tube. Further, since the modulation frequency increases as the resolution of the cathode ray tube increases, the above problem also prevents the resolution of the cathode ray tube from increasing.

  An object of the present invention is to provide a cathode ray tube, a display device, and an image display method capable of solving the above problems, achieving a shortening of an electron gun, and realizing a high resolution by realizing a high frequency drive. is there.

  In order to achieve the above object, a cathode ray tube according to the present invention is a cathode ray tube having a field emission cold cathode provided with an emitter and an extraction electrode, and the extraction electrode holds the potential of the extraction electrode constant. A power supply is connected to the emitter, and a modulation power supply for modulating the potential of the emitter is connected to the emitter.

  In order to achieve the above object, a display device according to the present invention includes the cathode ray tube according to the present invention and a deflection yoke.

  In order to achieve the above object, an image display method according to the present invention is an image display method using a display device having a field emission cold cathode provided with an emitter and an extraction electrode, and the potential of the extraction electrode is set. An image is displayed by controlling the amount of emission current emitted from the field emission cold cathode by modulating the potential of the emitter while maintaining a constant state.

  According to the cathode ray tube, display device, and image display method of the present invention, the electron gun can be shortened, and high-frequency driving can be realized to increase the resolution of the cathode ray tube. The action of the electron optical lens system, which is formed by the potential difference between the lead electrode and the electrode closest to the lead electrode, which is located on the electron emission side of the field emission cold cathode with respect to the lead electrode, changes the emission current. It can suppress changing with.

  According to the cathode ray tube and the display device according to the present invention, since the potential of the extraction electrode can be kept constant, the electrostatic capacitance component that affects the potential modulation of the emitter during the emission operation is caused between the extraction electrode and the emitter. Only the capacitance component in between is obtained, and the capacitance component affecting the frequency response can be reduced. For this reason, high frequency driving can be realized and it is possible to cope with higher resolution of the cathode ray tube. Further, the overall length of the electron gun can be shortened by reducing the length of the triode portion of the electron gun without degrading the frequency characteristics.

  In the cathode ray tube according to the present invention, a control electrode is disposed on the electron emission side of the field emission cold cathode, and a power source for holding the potential of the control electrode constant is connected to the control electrode. An embodiment is preferred. In the cathode ray tube according to the present invention, a control electrode is disposed on the electron emission side of the field emission cold cathode, and a modulation power source for modulating the potential of the control electrode is connected to the control electrode. It is also preferable to adopt an embodiment. Furthermore, the cathode ray tube according to the present invention has a plurality of field emission cold cathodes corresponding to R, G, and B, respectively, and the extraction electrodes constituting the field emission cold cathodes are electrically connected to each other. It is also preferable to have a mode in which they are bonded together.

  Hereinafter, a cathode ray tube according to an embodiment of the present invention, a display device using the same, and an image display method will be described with reference to FIGS. First, the cathode ray tube according to the present embodiment will be described with reference to FIG. FIG. 1 is a sectional view showing a schematic configuration of a part of a cathode ray tube according to an embodiment of the present invention.

  As shown in FIG. 1, the cathode ray tube according to the present embodiment has a field emission cold cathode 8. In the present embodiment, the field emission cold cathode 8 includes a semiconductor substrate 1, a conical emitter 4 provided on the semiconductor substrate 1, an insulating layer 3, and an extraction electrode 2. In the example of FIG. 1, only one emitter 4 is shown, but actually, a plurality of emitters 4 are arranged on one semiconductor substrate 1. In addition, the cathode ray tube according to the present embodiment includes three field emission cold cathodes 8 corresponding to R, G, and B as shown in FIGS.

  The insulating layer 3 is formed on the semiconductor substrate 1 and has a through hole 3a that exposes the plurality of emitters 4 to the outside. The lead electrode 2 is formed on the insulating layer 3 and has a through hole 2 a that matches the through hole 3 a of the insulating layer 3.

  In the field emission cold cathode 8, if the potential of the extraction electrode 2 is made higher than that of the emitter 4, a strong electric field is generated at the tip of the emitter 4, and electrons are emitted from the surface of the emitter 4 by the action of this strong electric field. The emission operation is performed.

  In order to perform this emission operation, in the cathode ray tube shown in FIG. 1, the control electrode 7 is arranged on the electron emission side (upper side in the drawing) of the field emission cold cathode 8 in the emitter 4 and the extraction electrode 2. A DC power supply 6 for supplying a constant voltage is connected to each electrode 2. The emitter 4 is connected to a modulation power source 5 capable of modulating the supply voltage. A through hole 7 a is formed in the control electrode 7, and the control electrode 7 is arranged so that the opening of the through hole 7 a and the opening of the through hole 3 a of the insulating layer 3 are aligned.

  Also, with this configuration, the current amount of the emission current emitted from the emitter 4 is controlled by supplying a constant voltage to the control electrode 7 and the extraction electrode 2 from the DC power source 6, and the potential of the control electrode 7 and the extraction electrode 2. This is performed by modulating the potential of the emitter 4 by the modulation power supply 5 in a state where the potential of the emitter 4 is kept constant.

  Thus, in the cathode ray tube according to the present embodiment, unlike the cathode ray tube shown in FIG. 10 in the prior art, by modulating the potential of the emitter 4 while keeping the potential of the extraction electrode 2 constant. Control the amount of emission current.

  For this reason, according to the cathode ray tube according to the present embodiment, the capacitance component affecting the potential modulation of the emitter 4 is only the capacitance component between the extraction electrode 2 and the emitter 4. That is, in the conventional example shown in FIG. 10, the capacitance between the extraction electrode 22 and the electrode (control electrode 27) closest to the extraction electrode 22 on the electron emission side of the field emission cold cathode 8 in the extraction electrode 22 The two capacitance components such as the capacitance between the extraction electrode 22 and the emitter 24 affect the frequency response, whereas in the present embodiment, the capacitance that affects the frequency response. There is one component. Therefore, this embodiment is advantageous for high-frequency driving as compared with the conventional example shown in FIG. 10, and according to this embodiment, it is possible to easily increase the resolution of the cathode ray tube.

  Further, as described in the prior art, the influence of the capacitance component on the frequency response is that when the distance between the electrodes is short, that is, the extraction electrode 22 and the control electrode by micron order processing using a microfabrication technology of a semiconductor process. 27, and the distance between them is noticeable when the distance between them is set on the micron order.

  On the other hand, according to the present embodiment, the capacitance can be reduced as compared with the conventional example shown in FIG. 10, and therefore the distance between the extraction electrode 2 and the control electrode 7 is set on the micron order. Even in such a case, it can be suppressed that the potential response of the extraction electrode 2 cannot correspond to the modulation frequency. Therefore, according to the present embodiment, it is possible to realize a cathode ray tube that does not deteriorate the frequency characteristics even if the length of the triode portion of the electron gun is shortened to shorten the total length of the electron gun.

  Here, the frequency characteristics of the cathode ray tube according to the present embodiment and the frequency characteristics of the cathode ray tube of the conventional example shown in FIG. 10 are compared using FIG. FIG. 2 is a diagram illustrating a simulation result of frequency characteristics of an electrode to be potential-modulated. Further, FIG. 2 quantitatively explains that the frequency characteristics of the electrode to be potential-modulated can be improved by using the present invention as compared with the conventional example.

  The simulation results in FIG. 2 show that the thickness of the insulating layer 3 existing between the extraction electrode 2 and the emitter 4 is set to 1 μm, and the control is on the electron emission side of the extraction electrode 2 and the field emission cold cathode 8 relative thereto. The distance from the electrode 7 is also set to 1 μm.

  As can be seen from FIG. 2, according to the cathode ray tube according to the present embodiment, it is possible to realize a frequency characteristic approximately twice that of the conventional cathode ray tube shown in FIG. Further, the effect of improving the frequency characteristics by the cathode ray tube according to the present embodiment becomes more conspicuous as compared with the conventional example as the distance between the extraction electrode 2 and the control electrode 7 becomes narrower.

  In addition to the improvement of the frequency characteristics, the present embodiment has advantageous features over the conventional example in the electron optical system formed by the electron gun. That is, according to the conventional example, when the potential of the extraction electrode 22 is changed, the action in the electro-optic lens system formed by the potential difference between the extraction electrode 22 and the control electrode 27 changes according to the amount of emission current. End up.

  On the other hand, according to the present embodiment, the potential of the control electrode 7 and the potential of the extraction electrode 2 are kept constant. For this reason, the action in the electron optical lens system formed by the potential difference between the extraction electrode 2 and the control electrode 7 does not depend on the amount of emission current. Therefore, even if the amount of emission current changes, the action of the electron optical lens system formed by the electron gun can be kept constant. This means that according to the present embodiment, it is possible to implement an electro-optic lens design that does not need to consider the dependency of the emission current amount.

  In the above-described embodiment, an example in which the potential of the control electrode 7 positioned on the electron emission side of the field emission cold cathode 8 in the extraction electrode 2 is held constant has been described. However, the present invention is not limited to this example, and as shown in FIG. 3, similarly to the potential supply to the emitter 4, the modulation power supply 5 is connected to the control electrode 7 to supply the potential to the control electrode 7. Can also be performed while modulating at a high frequency. Also in this aspect, the frequency characteristic is improved over the conventional example shown in FIG. 11 in which the modulation power source is connected to the control electrode. FIG. 3 is a sectional view showing a schematic configuration of a part of another example of the cathode ray tube according to the embodiment of the present invention.

  Next, the configuration of the electron source of the cathode ray tube according to this embodiment will be described with reference to FIGS. FIG. 4 is a perspective view showing an example of the electron source of the cathode ray tube according to the embodiment of the present invention. FIG. 5 is a perspective view showing another example of the electron source of the cathode ray tube according to the embodiment of the present invention. In FIGS. 5A and 5B, the semiconductor substrate constituting the field emission cold cathode is shown. The aspects are different. FIG. 6 is also a perspective view showing another example of the electron source of the cathode ray tube according to the embodiment of the present invention. In FIGS. 6A and 6B, the semiconductor substrate constituting the field emission cold cathode is shown. The aspects are different. FIG. 7 is a cross-sectional view showing another example of the electron source of the cathode ray tube according to the embodiment of the present invention, and the wiring structure is different between FIG. 7 (a) and FIG. 7 (b).

  As shown in FIGS. 4 to 7, the electron source of the cathode ray tube according to the present embodiment includes three field emission cold cathodes 8a to 8c corresponding to R, G, and B, respectively. Each example shown in each figure is different in wiring structure for holding the potential of the extraction electrode 2 of each of the field emission cold cathodes 8a to 8c corresponding to R, G, and B at a common potential.

  In the example shown in FIG. 4, the field emission cold cathodes 8 a, 8 b and 8 c have a common semiconductor substrate 1. The semiconductor substrate 1 is disposed on the ceramic package 12. The field emission cold cathodes 8a, 8b and 8c are formed on the common semiconductor substrate 1 by forming emitters 4a, 4b and 4c corresponding to the respective field emission cold cathodes and insulating layers (not shown). The lead electrodes 2a, 2b, and 2c are formed on each insulating layer corresponding to the emission cold cathode.

  The lead electrodes 2 a, 2 b, and 2 c are connected to and electrically coupled to contact pads 9 provided on the semiconductor substrate 1 by wiring patterns 13 provided on the semiconductor substrate 1. Further, the contact pad 9 is connected to a contact pad 10 provided on the ceramic package 12 via a bonding wire 11.

  As described above, in the example shown in FIG. 4, the lead electrodes 2a, 2b, and 2c are electrically coupled by the wiring pattern 13 provided on the common semiconductor substrate 1, and these potentials are held at the common potential. .

  The example shown in FIG. 5A is different from the example shown in FIG. 4 in that the field emission cold cathodes 8a, 8b and 8c have separate semiconductor substrates 1a, 1b and 1c, respectively. For this reason, contact pads 9a, 9b and 9c are provided on the respective semiconductor substrates 1a, 1b and 1c.

  Further, the lead electrodes 2a, 2b and 2c of the field emission cold cathodes 8a, 8b and 8c are respectively connected to the respective contact pads 9a, 13a, 13b and 13c via the wiring patterns 13a, 13b and 13c. It is connected to 9b and 9c. Furthermore, the contact pads 9a, 9b and 9c are connected to the contact pads 10 provided on the ceramic package 12 via bonding wires 11a, 11b and 11c, respectively.

  Thus, in the example shown in FIG. 5A, unlike the example shown in FIG. 4, the contact pads 9a to 9c are provided for each field emission cold cathode, and all of the contact pads 9a to 9c are bonded to the bonding wires 11a to 11a. By connecting to the contact pad 10 by 11c, the extraction electrodes 2a, 2b and 2c are electrically coupled, and these potentials are held at a common potential.

  Further, as shown in FIG. 5B, a common semiconductor substrate 1 may be used instead of the semiconductor substrates 1a to 1c for each field emission cold cathode shown in FIG. it can.

  The example shown in FIG. 6A differs from the example shown in FIG. 5A in that the ceramic package 12 is provided with contact pads 10a to 10c corresponding to the respective field emission cold cathodes. In the example shown in FIG. 6A, each of the contact pads 9a to 9c provided on each of the semiconductor substrates 1a to 1c is connected to the corresponding contact pad 10a to 10c via a bonding wire 11a, 11b or 11c. ing. The contact pads 10a and 10b are connected by a wiring pattern 14a provided in the ceramic package 12, and the contact pads 10b and 10c are connected by a wiring pattern 14b provided in the ceramic package 12.

  Thus, in the example shown in FIG. 6A, unlike the example shown in FIG. 5A, the contact pads 10a, 10b, and 10c corresponding to the field emission cold cathodes 8a, 8b, and 8c, respectively, are provided on the ceramic package 12. By connecting them, the extraction electrodes 2a, 2b, and 2c are electrically coupled, and the potential thereof is held at a common potential.

  Further, as shown in FIG. 6B, a common semiconductor is used in the same manner as in the examples of FIGS. 4 and 5B instead of the semiconductor substrates 1a to 1c for each field emission cold cathode shown in FIG. 6A. The substrate 1 can also be used.

  7A and 7B, unlike FIGS. 4 to 5, the electron source of the cathode ray tube is shown by a cross-sectional view. 7A and 7B, reference numeral 18 denotes a neck of a glass tube constituting the cathode ray tube.

  In the example shown in FIG. 7A, pin-like terminals 15a to 15c penetrating the ceramic package 12 in the thickness direction are arranged, and the ceramic package 12 has a common potential for the lead electrode (not shown). This is different from the example shown in FIG. 6A in that no wiring pattern is provided.

  In the example shown in FIG. 7A, lead electrodes (not shown) of the field emission cold cathodes 8a to 8c are provided with a wiring pattern provided on the ceramic package 12 and a bonding wire 11a electrically connected thereto. , 11b and 11c to the corresponding terminals 15a, 15b and 15c. Further, the terminals 15a, 15b and 15c are electrically connected by a lead wiring 16 having a trident structure. The routing wiring 16 is connected to one of a plurality of stem pins 17 provided on the neck 18.

  As described above, in the example shown in FIG. 7A, the extraction electrodes of the field emission cold cathodes 8a to 8c are electrically coupled outside the ceramic package, whereby the potentials of the extraction electrodes are common. It is held at a potential. Further, instead of the lead wiring 16 having the three-forked structure shown in FIG. 7A, as shown in FIG. 7B, three lead wirings 16a, 16b and 16c are used to connect the terminals 15a to 15c. A structure connected to one of the stem pins 16 may be adopted.

  Next, the configuration of the display device and the image display method according to this embodiment will be described with reference to FIG. FIG. 8 is a cross-sectional view schematically showing the configuration of the display device according to the present embodiment.

  As shown in FIG. 8, the display device includes a cathode ray tube 100, a convergence yoke 108, a deflection yoke 109, a deflection yoke power supply device 110, and an electron gun power supply device 111. The cathode ray tube 100 is the cathode ray tube according to the above-described embodiment, and is configured by disposing an electron gun 102, a magnetic shield 104, and a shadow mask 105 inside the tube 106. Reference numeral 103 denotes a fluorescent screen.

  With such a configuration, in the display device according to the present embodiment, the electron beam emitted from the electron gun 102 is scanned on the screen by the deflection yoke 109 as in the conventional display device including the cathode ray tube. Then, the electron beam that has passed through the shadow mask collides with the phosphor screen 103 to emit light, and an image is displayed.

  However, in the display device according to the present embodiment, the electron gun 102 includes the electron source 101 similar to the electron source described with reference to FIGS. The electron source 101 uses the field emission cold cathode 8 shown in FIG. Therefore, in the display device according to the present embodiment, while the potential of the extraction electrode is kept constant, the potential of the emitter is modulated to control the amount of emission current emitted from the field emission cold cathode. Image display is performed. For this reason, according to the display apparatus concerning this Embodiment, an image with high resolution can be displayed.

  The electron gun power supply device 111 supplies a potential to each electrode (not shown) of the electron gun 102 sealed in the neck portion of the cathode ray tube 100 via the stem pin 107. The deflection yoke power supply device 110 is used to drive the deflection yoke 109. Although not shown, the display device according to the present embodiment also includes a power supply device for driving the convergence yoke 107.

  The cathode ray tube, the display device, and the image display method according to the present invention can be widely used as a high-resolution cathode ray tube or the like that realizes high-frequency driving.

It is sectional drawing which shows schematic structure of a part of cathode ray tube concerning embodiment of this invention. It is a figure which shows the simulation result of the frequency characteristic in the electrode which carries out an electric potential modulation. It is sectional drawing which shows the one part schematic structure in the other example of the cathode ray tube concerning embodiment of this invention. It is a perspective view which shows an example of the electron source of the cathode ray tube concerning embodiment of this invention. It is a perspective view which shows the other example of the electron source of the cathode ray tube concerning embodiment of this invention, and the aspect of the semiconductor substrate which comprises a field emission cold cathode differs in FIG. 5 (a) and FIG.5 (b). ing. It is a perspective view which shows the other example of the electron source of the cathode ray tube concerning embodiment of this invention, and the aspect of the semiconductor substrate which comprises a field emission cold cathode differs in FIG. 6 (a) and FIG.6 (b). ing. It is sectional drawing which shows the other example of the electron source of the cathode ray tube concerning embodiment of this invention, and wiring structure differs in Fig.7 (a) and FIG.7 (b). It is sectional drawing which shows schematically the structure of the display apparatus concerning this Embodiment. It is a fragmentary sectional view which shows the structure of the conventional field emission cold cathode. It is sectional drawing which shows schematic structure of a part of cathode ray tube using the field emission cold cathode shown in FIG. It is sectional drawing which shows the one part schematic structure in the other example of the cathode ray tube using the field emission cold cathode 28 shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Semiconductor substrate 2 Lead-out electrode 2a Through-hole of lead-out electrode 3 Insulating layer 3a Through-hole of insulating layer 4 Emitter 5 Modulated power supply 6 DC power supply 7 Control electrode 7a Through-hole of control electrode 8 Field emission cold cathode 9, 9a-9c Semiconductor substrate Contact pads 10, 10 a to 10 c Contact pads 11, 11 a to 11 c Bonded wires 12 Ceramic packages 13, 13 a to 13 c Wiring patterns 14, 14 a to 14 c provided on the semiconductor substrate Provided wiring patterns 15a to 15c Terminal 16 Routed wiring 17 Stem pin 18 Neck

Claims (6)

A cathode ray tube having a field emission cold cathode with an emitter and an extraction electrode,
A cathode ray tube, wherein a power source for holding the potential of the extraction electrode constant is connected to the extraction electrode, and a modulation power source for modulating the potential of the emitter is connected to the emitter. 2. The cathode ray tube according to claim 1, wherein a control electrode is disposed on an electron emission side of the field emission cold cathode, and a power source for maintaining a constant potential of the control electrode is connected to the control electrode. 2. The cathode ray tube according to claim 1, wherein a control electrode is disposed on an electron emission side of the field emission cold cathode, and a modulation power source for modulating a potential of the control electrode is connected to the control electrode. 2. The cathode line according to claim 1, comprising a plurality of field emission cold cathodes corresponding to R, G, and B, respectively, wherein the lead electrodes constituting each field emission cold cathode are electrically coupled to each other. tube. A display device comprising the cathode ray tube according to claim 1 and a deflection yoke. An image display method using a display device having a field emission cold cathode provided with an emitter and an extraction electrode,
An image is displayed by controlling the amount of emission current emitted from the field emission cold cathode by modulating the potential of the emitter while keeping the potential of the extraction electrode constant. Image display method.

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