TW200411708A - Cathode ray tube and picture display device - Google Patents

Abstract

The invention relates to a cathode ray tube (CRT) having an electron gun (1), which is provided with a beam-forming part (20) for forming an electron beam (EBR, EBG, EBB). The electron beam is imaged onto a display screen (3) by means of the electron gun (1) and deflection means (2). In operation, the deflection means (2) deflect the electron beam (EBR, EBG, EBB) towards any position on the display screen (3), thereby constituting a deflection lens (2'), the lens strength of which varies with the deflection angle. The electron gun (1) is further provided with an electron lens (30) near the beam-forming part (20), for forming the electron beam (EBR, EBG, EBB) into a crossover (10R, 10G, 10B) in the vertical direction. Said crossover is shiftable along the gun axis (MA) so as to compensate for the varying power of the deflection lens (2'). The crossover (10R, 10G, 10B) may be located anywhere between the electron lens (30) and the deflection means (2). This is particularly advantageous for large deflection angles, such as angles of 120 degrees or more.

Description

(i) 200411708 发明, description of the invention; (the description of the invention should state: the technical field to which the invention belongs, the prior art, the content, the embodiments and the simple description of the drawings) TECHNICAL FIELD The present invention relates to a cathode ray tube, which includes ... A display screen 'which can receive an electron beam at the landing position; an electron beam which can generate the electron beam, the electron beam having: an electron beam forming part; and an electron lens whose lens intensity can be landed according to the electron beam The position varies with =, so that the first direction can be provided at an appropriate angle with the central axis of the electronic grabber. The intersection of electrons and intersections can be offset along the central axis. It is located between the electronic lens and the electronic grabber, and the sub grabber is facing the display screen. It includes a deflection member, which is arranged in the electronic grabber and display deflection member. _ 货 _ > φ a hits ^ β ^ ^ with the central axis of the brother μ, and the deflection member can adjust the deviation angle of the 丄 by a pre-macro recognition μ & 々 々 卞, 卞, can be adjusted The electron beam is in the ~ landing詈 ， ★ 扣 — Xiang Buying Gongyi ^ to obtain an electro-optical image on the head display screen, the Λ-biasing τ〒 member can form a deflection lens to act on the thunder + first about the image with such a cathode-ray tube _ 示 装置。 Display device. In the case of the month of October, it can also be referred to as "light spot".) The vertical direction of the entire work-Dickel will change. Especially in the corner of the display screen, the flare ratio. (2) (2) 200411708

Meng Meng said that in the known cathode ray tube, the linear intersection A and A were moved to the position inside the main lens or lifted out of the main lens, so that the intensity of the deflection lens could not be increased. Full compensation. In the known cathode ray tube, for each deflection angle value: the main mirror can play a substantial role in the imaging at the intersection, and the spot is more blurred, especially in the corner of the display screen, especially. SUMMARY OF THE INVENTION A specific embodiment of such a cathode ray tube is disclosed in the patent application US-A-5,262,702. 'In this cathode ray tube, there will be a -triode including a cathode for emitting electrons, and the triode is used as an electron beam forming section. Generally speaking, the electron beam can be gathered at a point in the triode, which is also called the objective lens point. In this application, the intersection means a position at which the diameter of the electron beam in at least one direction makes the position suitable for the electron beam to be displayed optically on the display at least in that direction On the screen and the image is displayed to the required sharpness. The electron lens provides a linear intersection for the electron beam by focusing the electron beam in a vertical direction. The intersection can be offset along the central axis and is located in the electronic grab, that is, between the electronic lens and the main lens. In the vertical direction, the offset, linear intersections are displayed on the display screen, and in the horizontal direction, the objective lens points in the triode are displayed on the display screen. When the electron beam is deflected ', the deflection member acts on the electron beam as an electron lens, which will be hereinafter referred to as a deflection lens. The main lens and the deflection lens are mainly responsible for displaying an electron beam on the display screen. 200411708 Invented Binmai The lens strength of this deflection lens can vary with different deflection angles. The deflection angle is defined as the angle corresponding to a certain landing position, and the angle is defined as the two angles formed by the electron beam near the landing position on the display screen and a virtual electron beam is landed in the center of the display screen. The deflection member can automatically converge in the horizontal direction. As a result, the defocus effect of the deflection lens in the horizontal direction makes the display of the objective lens point in the horizontal direction substantially focusable on the entire display screen.对于 For the deflection lens, it is usually made of quadrupole lens, which can make the deflection lens focus in the horizontal direction. Because the linear intersection can be offset :; the change in the lens intensity in the vertical direction of the deflection lens can be partially compensated. The cathode ray tube is preferably not too magical. Specifically, the image display device having the cathode display tube preferably includes a display screen having a relatively large screen surface area, and the depth dimension of the image display device is relatively small. The larger the surface area of the cathode ray tube display screen when the depth is set, or the smaller the depth of the cathode ray tube when the surface area of the screen is set, the higher the deflection angle during operation to ensure that the electron beam can cover the entire display screen. . The maximum deflection angle (that is, the deflection angle at the beam landing point in the corner of the display screen) is relatively large. A cathode ray tube with a maximum deflection angle of 120 degrees will soon be available with its novel design. Through efforts to obtain a type of cathode ray tube, the ice degree in the centimeter table is equal to the diagonal of the display screen in inches. In this case, the maximum deflection angle is approximately 135 degrees. One object of the present invention is to provide a 200411708 family-friendly cathode-ray tube of the type mentioned in the preamble, which can produce a clearer display across the entire display screen. In the cathode ray tube according to the present invention, the object can be achieved 'because an electronic grab can be configured to shift the intersection to a position between the main lens and the deflection member, which is near the objective lens plane of the deflection lens . At a limited deflection angle (such as 60 degrees or less), the deflection lens is weak, so the intersection is mainly imaged on the display screen by the main lens. In this case, the intersection is between the electron lens and the main lens, and near the plane of the objective lens of the main lens. When the deflection angle increases i, the intersection can be more imaged on the display screen by the deflection lens. The distance between the intersection and the main lens becomes smaller, and as a result, the effect of the main lens on the imaging of the intersection is reduced. The invention is based on the recognition that at relatively large deflection angles (generally about 120 degrees or more), the lens strength of the deflection lens can be such that if the image plane of the deflection telescope is consistent with the display screen, then The objective lens plane of the deflection lens is located between the main lens and the deflection member in the first direction. In order to improve the sharpness of the light spot, especially in the corners of the display screen, according to the present invention, the intersection must be located near the objective lens plane of the deflection lens. In this way, a clearer spot can be obtained at any deflection angle. At a deflection angle of about 120 degrees, the parent in the cathode ray tube according to the present invention is located inside the main lens, or beyond the main lens, so that the main lens has no effect on the intersection and the imaging, that is, the intersection Imaging on display fluorescence was performed only by the deflection lens. According to the present invention, the fe polar tube also has an advantage, that is, the display screen 200411708 —— ~~ — The size of the king is relatively small in the first direction, and it is particularly consistent on the entire display screen. At the intersection, the size of the electron beam is smaller in the first direction, and the display at the intersection is clearer on the display screen, and the light spot is smaller as a result. As the #deflection angle increases, the opening angle of the electron beam in the first direction becomes smaller near the display screen. Generally, this will increase the flare because of the space charge effect near the display screen. However, as the deflection angle increases, along with the reduction in the diameter of the% sub-beam in the first direction at the position of the main lens, the spherical aberration in the main lens is reduced by y. As a result, the light spot caused by the space charge effect Growth is compensated. i In the cathode ray tube according to the present invention, substantially complete compensation can be achieved, so that in the first direction, the spot diameter of the entire display screen is very uniform. In another specific embodiment, an electron beam forming part / knife of an electronic grab is configured to generate two electron beams, which are juxtaposed in a second direction (such as a horizontal direction) in the same plane. The lens intensity of the electron lens is different for each electron beam. The plane in which the electron beams are located is often referred to as the "collinear" plane. This electron pick-up can be used in color cathode ray tubes, and the three electron beams usually correspond to red, green and blue. Because the three electron beams on the "collinear" plane are separated by a certain distance (such as 6 mm) at the position of the deflection member, the electron beams follow different paths and automatically converge magnetic fields through the deflection member. However, on the display screen, the electron beams are essentially converged: a landing point, so that the deflection angle of each electron beam = the same. Therefore, the lens intensity of the deflecting lens is different for the three electron beams, especially -K)-200411708, said BJ Jixia. The deflection angle of the electron beam is higher than that of Article 5 and Chih-da-phene, for example, 120 degrees. The sharpness of the light spot on the display screen differs from the three-electron beam θ to 5 °. This effect will hereinafter be referred to as "color-dependent defocus". In this case, the lens strength of the electron lens for r di 2% _ bunzi beam

It's better to be different. The intersection of I 7 1 I + mother electron fruit can be shifted to the respective position /, on the corresponding side; the objective lens plane of the deflection lens of the bun bundle. In this way, the black-color-related political focus can be partially compensated, and the color cathode-ray tube operates particularly well. In a preferred embodiment of the L polarizer and the spring g, the electrons of the visible electron beam forming portion are viewed in the direction of the electron beams facing the display screen, including a focusing electrode and forming electrons. A dynamic focusing electrode, a second focusing electrode and an anode of the lens. In operation, the main lens is usually formed between the first focusing electrode and the anode. The € 10 grab includes (for example) a triode as the electron beam forming part. In this case, the electron grab has six electrodes. Electronic grabbing has been found to work well in such cases. S € branches are more economical and easier to manufacture than electron grabbers (which include ten electrodes) in known cathode ray tubes. Alternatively, the diode has, for example, a diode as an electron beam forming part. The dynamic focusing electrode may have several end faces, which extend laterally to the central axis, and the end faces have an elongated opening in the second direction to allow the electron beam to pass through. : The first-focusing electrode and the second focusing electrode also have end faces, which face the movement. The end faces have similar openings. In this way, the dynamic focusing electrode can form the electronic lens, which has a cylindrical lens portion of -11-200411708, and is located on any side of the dynamic focusing electrode. Since the dynamic focusing electrode can receive a dynamic voltage, and the dynamic voltage depends on the deflection angle ', the intensity of the electronic lens is variable during operation. -Therefore, the electron beam can be focused in the first direction, and the electron lens does not act on the electron beam in the second direction. This is advantageous because the deflection member can be automatically condensed, and as a result, the electron beam can be converged substantially in the second direction over the entire display screen. By increasing the dynamic voltage to increase the deflection angle during operation, the electronic lens parameter can be weakened according to the deflection angle 'and the intersection can be shifted to the display screen along the central axis. In this way, the intersection can be located substantially in the objective lens plane of the deflection lens, or in the case of a relatively small deflection angle, it can be located in the objective lens plane composed of the deflection lens and the main lens, and the intersection is on the display screen. The display can be focused on the entire display screen. When such an electronic lens is used, aberrations that occur are relatively small. A specific embodiment of the radio and magnetic g includes an electron lens, which has different electron lens intensities for each electron beam, and the cathode ray tube includes a moving beam: focus ^ ^, which for each electron beam Each has a sub-electrode, and the sub-electrodes are insulated in this way. The lens strength of the electron lens can be changed independently for each electron beam during operation 'because each sub-electrode can receive an individual dynamic voltage depending on the deflection angle and degree. The cathode ray tube partially compensates for color-related defocus. — 4 The moving and evil voltage can be changed between 350,000 and 2500 volts. In the specific embodiment # of the cathode ray tube, if the electron beam lands on the center of the display screen, the dynamic voltage is (for example) _ volt, and when the deflection angle is 120 degrees -12-(8) 200411708 Send __: _ Binxia 'The dynamic voltage is 1650 degrees. Compared with the known dynamic voltage in cathode ray tubes (between 3,000 and 4,000 volts), especially with traditional DAF grabbing (where the dynamic voltage is placed at a fixed focus voltage, such as 6000 Volts). In another embodiment, an astigmatism correction element is located near the main lens side facing the electron beam forming portion. Generally speaking, the design method of the main lens

The formula allows the electron beam to properly fill the main lens in the second direction. As a result, the objective lens point of the electron beam forming portion can be displayed on the display screen with good quality. If the intersection is close to the electron lens, that is, if the electron beam lands near the center of the display screen, the intensity of the main lens is not enough to focus the light spot on the display screen. This effect can be reduced by providing an astigmatism correction element such as a cylindrical lens for the main lens. In this way, the electron beam can be focused in front of the main lens in the vertical direction in advance, so that the light spot can also be focused on the display screen with a small deflection angle. It has been proved that in a cathode ray tube according to the present invention, the diameter shown in the first direction at the intersection on the display screen is smaller than 300 m for each deflection angle of each electron beam (i.e., the entire display screen). In this case, the maximum electron beam current is about 0.5 milliamps. In the cathode ray tube according to the present invention, the 'electron beam can be focused on the entire display screen. Thereby, a display device having a cathode ray tube according to the present invention exhibits relatively good image quality.施 Implementation methods The following will refer to these and other aspects of the cathode ray tubes and display devices according to the specific implementation instructions. -13-200411708 (9) Disclosure of the invention Chaobin page The color cathode ray tube according to the present invention as shown in Fig. 1 has the first specific embodiment of electronic grabbing. The electron beam can generate three electron beams: the outermost electron beam EBR, which corresponds to red; a central electron beam £ βG, which corresponds to green; and the outermost second electron beam, EβB, which corresponds to In blue. The electron beam EBR 'EBG and coffee are collinear in the plane of the drawing. In this patent application', it can also be referred to as "m-llneplane". In the electron grabbing of the first embodiment], the electron beam forming portion 20 is a triode ', which includes an electron source ⑴❿ ... the first electrode ⑴ and a second electrode ㈣2. The electronic grabber 1 also includes a first focusing electrode G3A, a dynamic focusing electrode G3B, a second focusing electrode G4, and an anode G5. These electron sources ⑽, 1QG, _ can emit electrons, which can form corresponding electron beams 咖, 咖, and gall in the electron beam forming portion 20. Bundle beams ebr, ebg, and ebb in the electron beam shape P-knife_0 have the smallest diameters at the objective lens points m2iG, 2 1 B. / Fruit EBR, EBG, can be guided to the display screen 3 of the cathode ray tube through the electronic lens, the main lens and the deflection lens 2 '. : The first focus electrode G3A and the second focus electrode G4 of the helium receive fixed focus ^ The pressure of a 4-claw coke is approximately (for example) 5.7 kV. The electron grab anode receives an anode voltage Va, such as about 3 (kV). In operation, the main lens may be 70% between the second focusing electrode G4 and the electron grabbing anode M. «Focus electrode G3B receives-dynamic focus voltage⑽. During operation, the voltage of the moving focus will increase according to the changes in the deflection angles of Echi, EBR, EBG, and EBB. Figure 2 illustrates the first focusing electrode θ3α in more detail. Specific Example-14- 200411708

(10) of 4 focus electrode G3 B and the second focus electrode G4. The electronic lens 30 includes two cylindrical lenses 31 and 32. The first cylindrical lens 31 is formed between the opening 33 A in the end surface 36 of the first focusing electrode G3 A and the opening 33B in the end surface 35 of the dynamic focusing electrode G3B, and the dynamic focusing electrode G3B faces the first focusing electrode G3A . The second cylindrical lens 32 is formed in the opening 33D in the end surface 36 of the second focusing electrode G4 and the end surface of the dynamic focusing electrode G3B "

Between the openings 33C and the dynamic focusing electrode G3B faces the second focusing electrode G4 〇 the parallel electrodes G3A and G3B; the interval between G3B and G4 is 0.8 mm, along the direction of the central axis MA, the The length of the dynamic focusing electrode G3B is about 3.6 mm °

The opening 33 is rectangular 'and is elongated in the horizontal direction. The beams EBR, EBG, and EBB that are juxtaposed in the horizontal direction can pass through the opening 33. For the convenience of explanation, this point is indicated by the points 37R, 37G, and 37B at the opening 33D in the figure, where the EBR, EBG, and EBB of each power station can be opened by n33D. The electron beams ebr, EBGa, Ef can pass through the other openings 3 3 A to 3 3 C in a similar manner. The length of the opening 33 in the horizontal direction causes the cylindrical lens 31 to act on the electron beams EBR, EBG, and EBB in a horizontal direction. For example, the length may be 18.6 mm. The diameter of the opening 33 in the vertical direction is (for example) 36 mm. Therefore, the 'cylinder lenses 31, 32 can make electricity + %% private. EBR, EBG, EBB can focus in a vertical direction in a certain way, thereby forming an offset. Intersection jump, ι〇〇, 10B. Therefore, in the specific embodiment, the shape of all the openings σ33 is the same. The first and second cylindrical lenses have the same intensity. Lens strength depends on solid -15-

I I200411708 I invented the voltage difference between the voltage " ^ and the dynamic focus voltage Vdyn. When the dynamic focus voltage Vdyn increases, 'the voltage difference vf · vdyn decreases' and therefore the intensity of the electron lens 30 decreases. The distance between the intersections 10R ′ 10 (), ι〇β, and the electronic lens 30 will increase. The operation of the electronic lens 30 will be explained below using an equivalent lens system, such as the lens shown in FIG. 3 The system is for the horizontal direction, and the lens music system shown in Figure 4 is for the vertical direction. In these drawings, only one of the electron easts, that is, the central electron beam EBG is displayed. For the other electron beams ebr, ebb, The equivalent lens system is the same in this specific embodiment of the dynamic focusing electrode g3B. If the electron beams EBR, EBG, £ ββ are converged at the center c of the display screen 3: at a nearby landing point, then the intersection l0. R, 10G, and ιβ are located inside the second focusing electrode G4 and near the end face 36, which faces the dynamic focusing electrode G3B. The dynamic voltage Vdyn is about 800 V. The editing lens 2 'does not work. As shown in the figure As shown in 3A, the main lens 50 can display the objective lens points 21R, 21G, and 21B in the horizontal direction on the display screen 3. As shown in FIG. 4A, the 'main lens can display the intersections i0r and iOG vertically on the display screen 3. , 10B. Intersections are 1 0 R, 1 0G, 1 0B and related objective lens points 2 1 R, The distance between 2 1 G and 2 1 B in the direction of electronic movement is preferably as small as possible.

When the distance between the land of the electron beams EBR, EBG, and EBB and the center C of the display screen 3 becomes larger, the deflection angle increases, and the intensity of the deflection lens 2 becomes larger. In the vertical direction, the deflection lens 2 · has a positive lens effect, and in the horizontal direction, the deflection lens 2 'has a negative lens effect. In addition, the distance between the main lens 50 and its landing point on the display screen 3 is increased by the electron beam EBR, EBG, EBB 200411708 (12). In Figures jB and 4B, the deflection angle is approximately 90 degrees. The intersections IOR, 100, and 10B may be offset a distance l i along the central axis MA. The intersections 10R, 10G, and 10B are now located on the objective lens plane OP 'formed by the main lens 50 and the deflection lens 2 in the vertical direction. In the horizontal direction, the deflection member 2 can automatically converge. The distance between the main lens 50 and the positions where the electron beams EBR, EBG, and EBB are converged on the display screen 3, and the negative lens effect of the deflection lens 2 can be shifted by the offset 10R, 10G, 10B is compensated at each deflection angle value. In the horizontal direction, since the deflection member 2 can automatically converge, the electron beams EBR, EBG, and EβB can be focused on substantially the entire display screen 3. In the vertical direction, the deflection angle of the direction of movement of the root plate son can be shifted at the intersection 丨 〇R, 丨 〇G, ⑺β ′, thereby substantially converging the electron beams EBR, EBG, and EBB. The distance between the intersection, 10G, 10B, and the objective lens plane op is relatively small, so the intersection 10R, 1〇 (}, ι〇β can be more clearly displayed on the display screen 3 at the deflection angle. In the case, the deflection lens 2 can be used to display the electron beams EBR, ebg, and EβB on the display screen 3 to an increased degree, and when the intersection is getting closer and closer to the main lens 50, the role of the main lens 50 can gradually be Reduce it to zero. In Figure 4C, the deflection angle is about 120 degrees. Now the intersection, 丨 〇g, 10B has been shifted by a distance L2, and the intersection will be located between the main lens and the deflection lens-~, The objective lens plane of the deflection lens 2 'is on the 0 °. At the intersection, 10B can be displayed on the display screen 3 exclusively by the deflection lens 2. The dynamic voltage vd 刈, which is fed to the dynamic focusing electrode G3B, is now approximately -17-

< I < I200411708 Description of the invention Continue to buy --——- 1650 Volts. When the deflection angle is small, the main lens 50 may be too weak to focus the electron beams EBR, EBG, and EBB on the display screen 3. The angle between the outermost rays of the electron beams EBR, Eβ (}, EBB and the central axis μα is too large. As a result, the display quality of the electron beams EBR, EBG, and EBB on the display screen 3 will be adversely affected, that is, light spots Cannot focus on display screen 3. This point can be seen in Figure 5A, where the electron beam £ b 〇1 indicated by the dashed line is the central electron beam. To limit this effect, it can be near the side of the main lens 50 A pre-focused cylindrical lens 40 is arranged, and the side faces an electron beam forming portion 20. The cylindrical lens 40 is much weaker than the electron lens 30, and therefore only works for a small deflection angle. Represented by the solid line The electron beam EBG can be focused in advance by the cylindrical lens 40 before entering the main lens 50. The angle formed by the outermost rays of the electron beam EBG and the central axis MA at the position of the main lens 50 will be reduced. Now the electron The beam EBG can be focused on a spot sg on the display screen 3 by the main lens 50, and a has a relatively high quality. For example, 'because the focusing electrode G4 is divided into two sub-electrodes A, G4 B (sub-electrode G4 A, The end face of G4B is shown as electrical in Figure 5B 4 1), so it can be flattened into a cylindrical lens 40. In this case, specifically, the cylindrical lens is formed between the two electrodes 41. The electrode 41 has an opening 42 elongated in the horizontal direction to allow electrons The beams EBR, EBG, and EBB pass. In the horizontal direction, the diameter of the opening 42 is about the same as that of the opening 33. The correction element 40 has substantially no influence on the electron beams EBR, EBG, and EBB. 200411708 The diameter of the opening 42 is much larger than the opening%, so that the lens effect of the cylindrical lens 40 is weaker than that of the electron lens 30. For example, in the vertical direction, the diameter of the opening 42 is 8.4 mm. Figure 6 is "collinear" A cross-sectional view of the electronic grab in the plane, which illustrates the second specific embodiment of the electronic grab 101. The second specific embodiment is substantially the same as the first specific embodiment, in which the dynamic focusing electrode system is divided into three in the horizontal direction. Sub-electrodes Gr, Gc, G1. Each sub-electrode Gr, Gc, G1 corresponds to one of the electron beams EBR, EBG, EBJB. The second embodiment is particularly applicable to color cathode-ray tubes. In operation Each of the sub-electrodes Gr, Gc, G1 forms a distinguishable electron lens 130R, 130G, 130B. By applying relevant and independent voltages Vdynl, Vdyn2, and Vdyn3 to the electrodes Gr, Gc, G1, respectively, the electron lens can be made The lens intensities of n〇R, 130G, and 130B are different. As shown in Fig. 7, this allows the three electron beams EBR, EBG, and EBB to intersect 1 i0r,! 10G, and 10B each in a different one. Specifically, the intersection 1 10B of the blue electron beam EBB is located between the electron lens 130B and the main lens 150, and the intersection of the green electron beam EBG is again located within the main lens 150, and the red The intersection of the electron beams is located between the main lens 1:> 0 and the deflection lens I02R. In the scheme, the 'color-dependent defocusing effect' looks wider than the actual situation. In practice, the intersections 110r, 〇G, 11 () β are along the central axis MA, and the distance between them is small. At the deflection lens 2, the interval between the electron beams EBR, £ BG, and EBB is, for example, 6 mm. If the electron beams EBR, £ BG, and EBB (for example) are deflected toward the northeast corner showing the camp twilight ^, blue The deflection angle of the electron beam EBB is smaller than that of the green thunder-19-200411708 (15) The invention states that the deflection angle of the EBG beam EBG is smaller than that of the red electron beam EBR. Therefore, the lens intensity of the deflection lens 102B of the blue electron beam EBB is smaller than that of the deflection lens 102G of the green electron beam EBG, and the lens intensity of the deflection lens 102B of the green electron beam EBG is less than the deflection of the red electron beam EBR. Lens intensity of 1.0 2 R. Because the intersections 110R, 110G, and 110B can be offset by different distances, by appropriately selecting the corresponding dynamic focus voltages Vdynl, Vdyn2, and Vdyn; 5 'intersections 110R, 110G, and 110B can be substantially adjusted. Fixed in the objective lens planes oPR, oPG, oPB of the related deflection lenses 02R, 102G, 102B. Therefore, in this specific embodiment of the electronic grab 101, the occurrence of color-related defocus can be substantially prevented ', even if the deflection angle is relatively large (such as 120 degrees), it can be excluded. For example, 'For each electron beam EBR, EBG, EBB, the appropriate relevant dynamic voltages Vdynl, Vdyn2, Vdyn3 will be listed in a table, which is related to the landing point in the center of display screen 3, and the relevant deflection angle is 0 degrees. ; And for the landing point showing the northeast corner of Yingyang 3, the relevant deflection angle is 120 degrees.

The table also shows the diameters x, y of the beam spots SR, SG, SB of the electron beams EBR, £ BG, Εββ, where the horizontal direction is (> 〇, the vertical direction is (y), and in this case the light spot system It is formed on the display screen 3. For all the values listed in the table, the fixed focus voltage applied to the _th focus electrode G3a and the second focus electrode G4 is 5.66 kV, and the electrons of the electron beams ebr, EB0, EBB The beam current is 0 5 milliamperes. Table M Demonstration values of dynamic voltages Vdyn !, Vdyn2, Vdyn3, and the relative diameters of the spots SR, SG, and 化 formed by the three-electron east ΕβR and EBG EBB. 200411708 (| 6) Farewell said that Chaobin sells central EBR Vdyn 1: = 829 Volts x (SR) = 783 microns y (SR) = 269 microns EBG Vdyn2: = 829 Volts x (SG) = 1.25 mm y (SG) = 277 microns EBB Vdyn3 : = 829 Volts x (SB) = 783 microns y (SB) = 269 microns Northeast corner EBR V dy η 1 = 1736 Volts x (SR) = 4.05 mm y (SR) = 275 microns EBG Vdyn2 = 1639 Volts x (SG ) = 5.10 mm y (SG) = 262 microns EBB Vdy n3 = 1 557 volts x (SB) = 3.69 mm y (SB) = 286 microns when the deflection angle is 120 degrees The dynamic voltages Vdyn 1, Vdyn2, Vdyn3 are much smaller than 2 kV 'and are different from the traditional so-called "daf" electronic grabbing dynamic focus voltage, which is' It does not have to be a fixed focus voltage. The spots SR, SG, SB are in The diameter y in the vertical direction is less than 300 micrometers across the entire display screen 3. Therefore, the electronic grabber 101 of the second embodiment is very suitable for the so-called FIT-type cathode ray tube, which has ερ-α] 058 942. There is no shadow mask for color selection in this type of cathode ray tube (FIT-CRT). The landing points of the three electron beams EBR, EBG, and EBB on the display screen 3 can be respectively based on the phosphor color corresponding to the electron beam ( That is, red, green, and blue) correction. Phosphor (for example) can be arranged on the display screen 3 in a horizontal path. On either side of the phosphor path, r and lead elements can generate first and second correction signals. The electrons on the corresponding code path The landing point of the beam can be determined based on the difference between the first and second correction signals. When writing an image, the electron beam usually does not move linearly on the phosphorus path; instead, interference occurs, which is mainly caused by, for example, the magnetic field in the deflection member The electron beams moving in a direction perpendicular to the phosphorus path may be deflected undesirably 'and land on a colored phosphorus path that does not correspond to the electron beam, -21-200411708 1} I issued: _ Su Bin ^ There is a color error in the light image. If the electron beam is not completely landed on the phosphorus path 'in operation but is partially landed on one of the index elements, the difference between the correction signals will be relatively large. In this case, a magnetic correction coil can be activated to cause the electron beam to deflect outside the jaw in a direction perpendicular to the phosphorus path, thereby correcting the effect of magnetic fluctuations at the landing point of the electron beam. FIT cathode ray tubes are cheaper because they can remove the shadow mask from cancer, and can use electron beams with a lower electron beam current. For example, the maximum electron beam current is about 0.5 amperes. FIT cathode ray tubes place high demands on the size of the light spot on the display screen. If the electron beam is correctly landed on the dish path, the electron beam will not land on the index element, and then both correction signals will be zero. For this purpose, the spot size perpendicular to the direction of the disk path on the display screen (ie the normal vertical direction) should not be larger than the diameter of the phosphor path in that direction. In a 32-hour wide screen true plane (WSRF) FIT cathode ray tube with a line (PAL format), the diameter is approximately 325 microns. Table 1 shows that in the electronic grabbing 101 of the second embodiment, the spot size in the vertical direction (y) is on the entire display screen 3 at the maximum electron beam current of 0.5 milliamps normally in a FIT cathode ray tube. All meet this requirement. The front view of FIG. 8 illustrates an example of the dynamic focusing electrode in more detail, which has three sub-electrodes Gr, Gc, G1, and is applicable to the second specific embodiment of the electronic grabber. Viewed in a direction perpendicular to the "collinear" plane, the electrodes Gr, Gc, G1 each include two sections I 42r, 143r; 142c, 143c; 1421, 1431, 200411708 (18) separated by a certain distance from each other, for example 0.2 mm. Therefore, between the relevant sub-electrodes Gr, Gc, G1 bis sections i42r, 143r; 142c, 143; 142b 1431, the opening formed has a diameter of, for example, 3.6 mm. During operation, the electron beam EBR, EBG and EBB are located at positions 141R, 141G, and 141B through the open α 〇 area ^ and 1 4 2 丨, c, 1; 14 3 r, c, 1 are located adjacent to each other in the "common The "line" plane is on the same side, and in this example is attached to a common glass plate 144A, 144B, respectively, to be electrically insulated from each other. The dynamic focusing electrode G3B can be fixed to the electronic grab by various forms of 145A and 145B. Fig. 9 is an image display device including a cathode ray tube having the electron pick-up 101 of the second embodiment. During operation, the control unit A in the image display device is configured to receive an image number V 丨 D ′ and generate modulation signals μ R, M G, MB and position signals from the image signal v I d? Ingenious and clever. The k-number MR, MG, and MB can be supplied to the respective electron sources cr, CG, and CB to modulate the current density of the electron beams EBR, EB (}, and Eββ, thereby respectively changing the red, green, and blue phosphorus on the display screen. The intensity of light emission at the landing points of the electron beams EBR, EBG, and EBβ on 103. The position signals Px and Py can be supplied to the deflection circuit D, which can form a line frequency deflection current L and a frame frequency deflection current according to the positions Lbl. ". The deflection member 02 can be coupled to the deflection circuit D to receive the deflection current B1. Specifically, the deflection member 102 includes a line deflection coil Li that can receive the line frequency deflection current Li! 8 {1, EBG, EBB on the deflection electron beam in the horizontal direction. In addition, the deflection member 102 includes a frame deflection coil ^, which -23-(19) (19) 200411708 said that the frame frequency can receive the frame frequency The deflection current b is used to deflect the electron beams EBR, EBG, and EBB in the vertical direction during operation. Position signals Px and Py can also be supplied to the focusing circuit F to generate dynamic focusing voltages Vdynl, Vdyn2, Vf1 \ / ni /, and From

Vdynj. In operation, the left sub-electrode 动态 of the dynamic focus electrode G3B can receive a first dynamic focus voltage vdyni, the central sub-electrode Gc can receive a second dynamic focus voltage Vdm, and the right sub-electrode Gr can receive a third dynamic focus voltage Vdyn3. The dynamic focus voltage is usually a fourth-level signal, which depends on the landing points of the electron beams EBR, EBG, and EBB on the display screen 3. The figure shows a dynamic focusing electrode with three sub-electrodes, Gc, Gr. The other electrodes in € 10 Grab 101 are equivalent to electronic Grab! The electrode shown in the first specific embodiment of the example is shown in Figure 4. For the sake of convenience, every 4 mesh Jr ^ horses, the other electrodes are not shown in the drawing. The drawings are schematic and not scaled. Through the description of the drawings and related specific embodiments, it can be understood that the drawings and specific embodiments of this method are not to be considered as limiting the scope of the present invention. The present invention particularly includes modifications of the specific embodiments described herein, and those skilled in the art can implement such modifications without departing from the scope of protection of the appended patent application. Brief description of the figure: It is a schematic illustration of a cathode-ray tube according to the present invention, which has an electronic grab in the first specific embodiment; FIG. 2 is a detail illustrating the first specific embodiment of the electronic grab; FIG. 3 is a cathode ray The equivalent lens system of the electron lens in the tube is aimed at the horizontal direction; '-24 · (20) 200411708 ㉚Touch Bin 裒 is the equivalent lens system of the electron tunneling lens in the cathode ray tube shown in Fig. 4 in the vertical direction; Fig. 5A is an equivalent lens system of the first embodiment of the electronic embodiment-an astigmatism correction element is provided outside; ^ ,, ', its figure 3B is a front view of the electrode of the correction element; Fig. 6 is a schematic view Describe the second specific embodiment of electronic grabbing;

FIG. 7 is an equivalent lens system of a cathode ray tube, which has the electron grab in the second embodiment; FIG. 8 is a more detailed description of the dynamic focusing electrode in the electron grab in the second embodiment, and FIG. 9 is an image display device according to the present invention. Schematic representation of symbols

EBR

EBG

EBB 20

10R, 10G, 10B G1 G2

G3A

G3B G4 G5 21R, 21G, 21B 3 0 50 Electron grab electron beam electron beam electron beam electron beam forming part crossing first electrode second electrode first focusing electrode dynamic focusing electrode second focusing; r electrode anode objective lens point electron lens main Lens-25, 200411708

Prize Presentation Page 2 2, j 31, 32 35 36

jjA 'jjd N jjL' j j L) MA 37R, 37G, 37B Vf

Vdyn

40 BL OP1 LI L2 OP CR, CG, CB EBG '

SR, SG, SB 41 42 G4A, G4B 101

Gr, Gc, G1 130R, 130G, 130B Vdynl, Vdyn2, Vdyn3 MOR, I 10G, 1 10B 150 102R, 102G, 102B OPR, 〇PG, OPB 142r, 143r Deflection member deflection lens display screen cylindrical lens end surface end opening central axis Point focusing voltage, dynamic focusing voltage, pre-focused cylindrical lens, _position objective plane, distance from objective plane, electron source, beam spot electrode, opening electrode, electron grab electrode, electronic lens voltage, and main lens deflection lens, objective section 200411708 (22) Invention · Mengbin page 142c, 143c section 142, 1431 141R, 141G, 141B section position 144A, 144B glass plate 145A > 145B various forms MR λ MG λ MB modulation signal Pχ, Py position signal A control unit VID image Signal D lr l | deflection circuit frame frequency deflection current line frequency deflection current 102 deflection member L, Lt · line deflection coil frame deflection coil F focusing circuit

Claims (1)

200411708 Fan patent application 1. A cathode ray tube (CRT) comprising: a display screen (3) which can receive an electron beam (EBR, EBG, EBB) at a landing position (BL); ^ An electron grab (1), which can generate the electron beam (EBR, Εβσ, eb β), the electron grab has: an electron beam forming part (20); φ an electron lens (30), the lens intensity of which can be determined according to the electron Beam (ebr, EBG, EBB) landing point changes, so that at an appropriate angle with a central axis (MA) of the electronic grab (1), the electron mother (EBR, EBG, EBB) in a first direction ) Provides an intersection (10R, 10 (}, 10B), which can be offset along the central axis (MA), and a main lens (50), which is located at the electron lens (3〇) and one end of the electronic grab (1), the electronic grab is facing the display screen (3); and includes a deflection member (2), which is arranged between the electronic grab (1) and the display Between the screens (3), the deflection member can automatically converge in a second direction, the second direction of the instrument is transverse to the first direction and the central axis (MA) The deflection member can also be used to adjust the electron beam (EBR, EBG, EBB) on the display screen (3) by deflecting the electron beam (EBr, EBG, £ BB) through a predetermined deflection angle. Landing position to obtain an electro-optical image on the display screen (3), the deflection member (2) can form a deflection lens (2,) to act on the electron beam (EBR, EBG, EBB), the cathode ray tube It is characterized in that the electronic grab (丨) system is configured to shift the intersection 200411708 _ί_Si application area (10R, 10G, 10B) to the main lens (50) and the deflection member (2). This position is located near an objective lens plane (OP) of the deflection lens (2,). 2, such as the cathode ray tube of the first patent application scope, characterized in that the electron grabs (1) 's electrons The beam forming portion (20) is configured to generate three electron beams (£ BR, £ BG, EBB), which are juxtaposed on the same plane in the second direction, and are also characterized by a lens of the electron lens (30) Intensity varies for these electron beams (EBR, EBG, EBB) 3. The cathode ray tube of item 1 in the scope of the patent application is characterized in that when viewed from the direction of the display screen (3), the electron beam (1) in which the electron beam forming portion (20) is located is continuously provided with A first focusing electrode (G3A), a dynamic focusing electrode (G3B), a second focusing electrode (G4), and an anode (G5) for forming the electronic lens (30). For example, the cathode ray tube of the third scope of the patent application is characterized in that the dynamic focusing electrode (G3B) has an end face (35), which is located transversely to the central axis (ma), and the end faces such as Yanhai are in the ^ direction It has an elongated opening (3 :, 33C) 'to allow the electron beam (_, coffee, eb β) to pass through, and the focusing electrode (G3A) and the second focusing electrode ㈣ both have an end surface facing the The dynamic focusing electrode (G3B), the end faces have an elongated opening (33A, 33D) in the second direction. t! The two cathode cathode ray tubes of the second and third items are characterized in that the heart two ... The U pole (G3 B) includes __child for these electron beams (ebr, _ 'Εβ of the electron beam) The electrodes, these electrons (Gc, G1) are electrically insulated from each other. 200411708 Shenyang won the bid to buy Fan Fanbin 6. If the cathode ray tube of the patent application No. 3, 4 or 5 is used, it is characterized in that the dynamic focusing electrode (G3B) can receive a dynamic voltage (Vdyn) during operation. Depends on the deflection angle. 7. The cathode ray tube according to item 6 of the patent application, characterized in that the dynamic pressure (\ ^ 乂 11) can be changed between 350 volts and 2500 volts. 8. The cathode ray tube of item 2 of the patent application is characterized in that an astigmatic G positive element (40) is located near the side of the main lens ($ q), which side faces the electron beam forming portion (20 ). 9. The cathode ray tube according to any one of Keshu's patent applications, characterized in that when an electron beam current of the electron beam (EBR, EBG, EBB) is at most about 0.5 milliamps, the intersection (1〇 R, 10G, 10B) A diameter displayed in the first direction on the display screen (J) is less than 300 microns at least substantially on the entire display screen (3). 1 〇. A device comprising a cathode ray tube as in at least one of the items in the scope of the patent application.