TW200409169A - Display tube and display device - Google Patents

Abstract

A display tube comprises an electron source (10), a module (20) provided with a guidance cavity (25R, 25G, 25B) for guiding electrons emitted by the electron source (10) to an exit aperture (27R, 27G, 27B) of the guidance cavity (25R, 25G, 25B), and beam-shaping means (30) for forming an electron beam (EBR, EBG, EBB) from guided electrons leaving the exit aperture (27R, 27G, 27B). The electron beam (EBR, EBG, EBB) travels towards a display screen (3). The beam-shaping means (30) are arranged to constitute, in operation, an electron lens for shaping the electron beam (EBR, EBG, EBB) so as to compensate for unwanted distortions of the shape of the electron beam (EBR, EBG, EBB) between the exit aperture (27R, 27G, 27B) and the display screen (3). These distortions are, for example, caused by the magnetic field of deflection means (2). The image quality of the display tube is improved.

Description

200409169 玖 发, explanation (invention description should state: the technical field to which the invention belongs, prior technology, content, embodiments and simple description of the drawings) TECHNICAL FIELD The present invention relates to a display tube, which includes: an electronic source, A module for emitting electrons; the module includes a guide hole, and the guide hole has: an entrance hole, an exit hole located on the back of the module; and a screen wall for receiving electrons Emitting the secondary electrons; an electron beam forming device for forming an electron beam from the secondary electrons at the position of the exit hole, and a display screen for receiving the electron beam and generating an electron beam through the electron beam; image. The invention also relates to a display device comprising such a display tube. Prior art A specific embodiment of this display tube is a cathode ray tube 1 known from WO 01/26131. The cathode ray tube has an electron pick-up type of "reflecting electron cathode π. This electron pick-up contains a module with a guide hole, an inlet hole, and an outlet 孑 L. The screen wall of the guide hole is at least partially The emitter material is composed of the emitter material which can emit the secondary electrons after receiving an incident electron. The emitter material is preferably isolated and has a secondary electron emission coefficient δ. The material released from the emitter material with energy Eρ The number of secondary electrons is the same as the result of the incidence of an electron on the emitter material. The electron grab includes an electron beam forming device to form an electron beam from the secondary electrons. In known cathode ray tubes, they contain The reflective electrode uses 2 ^ 0409169 (2) 1111 * 11 to apply a first electric field with an intensity E1, and the intensity E1 is substantially provided for transmitting secondary electrons to the exit hole. If the exit hole has The small surface associated with the entrance hole surface, during operation, the electron beam can be formed from the secondary electrons at the exit hole location at a relatively high electron beam current density.

In operation, the display screen can receive the electron beam. The display has 燐 light-quality pixels so that when the electron beam hits the pixels, it emits cold light. In this way, one image can be displayed. It is known that a display tube display image generally does not have the disadvantage of desired quality throughout the entire display screen. For example, at edges that are particularly close to the corners of the display screen, the displayed image is more blurred than at the center of the display screen. SUMMARY OF THE INVENTION An object of the present invention is to provide a display tube type described at the beginning of the present invention, in which at least a part of the display screen can improve the drawing quality. This object is to achieve a display tube according to the present invention, wherein the electron beam forming device forms an electron lens by changing the shape of the electron beam to at least partially compensate for an undesired change in the shape of the electron beam between the exit hole and the display screen. The present invention is based on the recognition that the electron beam image on the display screen usually has no shape throughout the display screen, which is required for displaying a high-quality image. In operation, an unnecessary change will occur in the shape of the electron beam between the exit hole and the display screen. For example, the cross-section of the electron beam cross-section of the plane of the display screen, which is referred to as “’ point π ”below the cross-section, can be changed using the point of impact, where the display screen can receive electricity 200409169 (3)

The invention did continue to buy I-beams, so pixels near the edges, especially at the corners of the display screen, would be quite blurred. As a result, images near the edges and in the corners of the display screen are often blurred. The shape of the electron beam approaching the exit hole is changed via the electron lens, so unwanted changes in points can be at least partially compensated for at least individual display screens. In an advantageous embodiment, the electron beam forming device comprises a first electrode, which is divided into at least four parts, and is operable to receive at least two different voltages. This specific embodiment can provide greater design freedom in implementing a desired electronic lens. For example, a quadrupole lens or a cylindrical lens may be formed by appropriately selecting a voltage. The electron beam forming device can adapt the shape of the electron beam in a relatively simple manner of the desired shape. By using a dynamic voltage, the shape can be changed during operation. A fairly low voltage scan pair is sufficient for this purpose. In addition, this electron lens similar to the known cathode ray tube has a rotationally symmetric element so that the diameter of the electron beam can be adapted to the main lens. For example, a quadrupole lens may be formed in that a first part and a second part are located on both sides of the exit hole in a first direction, and in operation, receive a first voltage, and a third part and A fourth part is located on both sides of the exit hole in a second direction perpendicular to the first direction, and in operation, receives a second voltage. The display tube contains a self-convergent biasing device for changing the point of impact of an electron beam on the display screen. It then has the advantage that if the shape of the electron beam is dynamically changed, and this change is due to the electron beam impact point on the display screen 200409169 (4) Invention code page: Let 0 '-the impact point of the electron beam It can be changed by applying an electromagnetic field, hereinafter referred to as a deflection field, which deflects electrons via a deflection device. For this purpose, the bias field usually has a bipolar element.

The self-converging bias field has higher even-order elements, such as sixth- or tenth-order elements. Due to this higher-order element, the deflection field can act as an electron lens on the electron beam. For example, a hexapole field acts as a quadrupole lens on the electron beam, so astigmatism will occur. In the vertical direction, the electron beam is focused through the deflection field, and the electron beam is still in focus in the horizontal direction, but it will be strengthened. The point then has a relatively large eccentric elliptical core in the horizontal direction, where the blur extends in the vertical direction.

The shape of the electron beam does not usually change to the same range throughout the display screen. When the electron beam strikes away from the center of the display screen, this change may be stronger, for example, because the intensity of the deflection field and the distance covered by the electron beam passing between the exit hole and the display screen increase. This is compensated because the electron lens can reduce the exit hole angle of the electron beam in the vertical direction, that is, the external electron path of the electron beam is expanded to an angle close to each other of the exit hole. As a result, the core of the point grows vertically and the ellipticity of the core decreases. The point will be less blurred and the image quality can be improved. The angle of the exit hole is preferably changed in the vertical direction due to the impact point of the electron beam. The exit hole is imaged on the display screen via a main lens. To make up 200409169 (5) Description of the title page: To compensate for defocusing, the display tube can then contain a correction element, which is usually placed between the module and the main lens. An example of such a correction element is a DAF element known from US-A-4,814,670. The DAF element includes an electronic optical quadrupole lens, and its power change is determined by the deflection of the electron beam, and the power of the main lens can also be reduced.

If a DAF element is provided, the electron beam can also be kept substantially in vertical focus throughout the entire display screen. Close to the edges, especially at the corners of the display screen, the dots then have a relatively large centrifugal oval in the horizontal direction. It was found that the electron lens formed by the electron beam forming device can actually compensate the ellipticity of the point during the entire display screen, so that a point having a desired shape and a satisfactory focus can be displayed substantially throughout the entire display screen. The image quality will be satisfactory and fairly consistent throughout the display screen. In a preferred embodiment, the electron beam forming device includes a reflective electrode for transmitting secondary electrons in a guide hole substantially toward the exit hole.

This is advantageous because a higher voltage is usually more necessary for transmitting the secondary electrons than changing the shape of the electron beam or adapting the diameter of the electron beam to the main lens. The reflective electrode can receive a reflected voltage Vhop for transmitting the secondary electrons. The reflected voltage is higher than the first voltage VI and the second voltage V2. The reflective electrode and the first electrode are preferably located substantially on the same plane near the back of the module, and the reflective electrode is located at an opening of a first electrode. In this structure, also known as a planar electron lens, the voltages Vhop, VI, and V2 can be quite limited. It is advantageous when the four parts of the first electrode have substantially the same surface. The structure of the first electrode can thereby be symmetrical. It would be advantageous if the electronic lens had a -10- 200409169 (6) description of the invention on the continuation of a rotationally symmetrical element. The electron beam diameter adaptability of the main lens is then very consistent. In a further preferred embodiment, an electron lens can be formed by an electron beam forming device. The electron lens includes an even-numbered multi-pole lens, and the even-numbered order is higher than a fourth-order order. For example, the electron lens includes a hexapole lens or an octapole lens. An octapole lens can be used, for example, to reduce the lens error of the main lens. In operation, octopole lenses can reduce, for example, spherical distortion. φ If the deflection field has a fairly strong element of order ten, a hexapole lens will be advantageous, so the shape of the electron beam in the area of the deflection device will change due to the nebula. In any case, this can be partially compensated in that the electron beam forming electron lens includes a hexapole lens. In a specific embodiment of the cathode ray tube, the first electrode has eight-sections. An electronic lens including, for example, an octapole lens may be formed using this embodiment of a transparent lens by applying at least two different voltages to these portions. It is also an object of the present invention to provide a display device having improved and consistent image quality. This object is achieved in that a display device includes a cathode ray tube as described above. These and other aspects of the invention will become more apparent from the description of the following specific examples. -Embodiment In a cathode ray tube (CRT) according to the present invention, electron grabbing 1 can generate an electron beam EB, and focus the beam through a main lens 50. The electric beam 200409169 (7) is a sub-beam at * Electronic grab 1 appears and is displayed on display screen 3. To change the point of impact of the electron beam EB on the display screen 3, the deflection device 2 which constricts itself in the horizontal direction is around the neck of the cathode ray tube. The electronic grab 1 is a HEC electronic grab. The HEC electronic grab includes a module 20 for guiding holes 25R, 25G, 25B for transmitting electrons. For each of the guide holes 25R, 25G, and 25B, the cathode ray tube has a separate and corresponding electron source 1 OR, 10G, and 10B, respectively. This is a thermionic cathode. In operation, electrons are emitted by heating the cathode through a filament. The divided second electrodes 15R, 15G, and 15B using a second electric field are respectively disposed between each of the electron sources 10R, 10G, and 10B, and the module 20. This second electric field is to take out and release electrons from the electron sources 10R, 10G, 10B, and accelerate them to the relevant guide holes 25R, 25G, 25B of the module 20. By changing the second electric field strength through the second electrodes 15R, 15G, 15B, the number of electrons entering the relevant guide holes 25R, 25G, 25B can be conformed; therefore, the circulation density of the relevant electron beams EBR, EBG, EBB can be in the exit hole Adjust the positions of 27R, 27G, 27B. The second electrodes 15R, 15G, and 15B are, for example, a grid composed of 60% electrons. The module 20 shown in more detail in FIGS. 2 and 3 has guide holes 25R, 25G, 25B, entry holes 26R, 26G, 26B, and exit holes 27R, 27G, 27B. The guide holes 25R, 25G, and 25B have, for example, a frusto conical shape that is symmetrical around the central axes 29R, 29G, and 29B. At least a part of the guide walls 25R, 25G, and 25B close to the exit holes 27R, 27G, and 27B is formed of an emitter material having an electron emission coefficient δ. Class electron emission. 200409169 (8) Description of the invention Continued Reflective Electrode-Pole 3 1, 3, 2 and 3 3 are close to the display screen 3: m $ 旳 支 组 2 0 The outlet holes 27R, 27G, 27B. The U-shaped X-ray electrodes 31, 32, and 33 can receive a reflected electric exhibition for applying a first electric field E1, so that secondary electrons in the guide holes 2 5 R, 2 5 G, and 2 5 B can be received. Pass μ k to the exit holes 27R, 27G, 27B of the temple. These derivations, among which the electron number coefficient (5 in the next sub-emission system Vhop and then the material package. Or, or silicon nitride lead holes 25R, 2 5G, 2 5B are transmitted through a reflection process to leave the guide The number of electrons in the holes 25R, 25G, and 25B is as much as the amount of entry. For this purpose, the ++ 1000 emission of the emitter material should average 1 on the transmission hole. The advantage is that if the emitter material has a Quite ancient π 1 _ Qiao large electric number 5max. The electric field strength of the first electric field E 1 can be kept quite limited with the ruler and the radio voltage. Vhop is, for example, 1000 volts. (MgO) and has a layer thickness of 0.5 mm. The emitter material contains glass, polyamine, ethoxide (Si2N4) (Si3N4). Moreover, the electron source 10R, 10G, 10B The surface 21 part of the module 20 has the emitter material. As a result, the emitted electrons that first hit the entrance holes 26R, 26G, 26B on the surface 21 firstly release secondary electrons in this area, which are in the first electric field E It still enters the guide holes 25R, 25G, 25B under the influence of 1. Therefore, the electrons emitted through the electron source 10 are used as efficiently as possible. It is possible to place the electron sources 10R, 10G, and 10B at different centers from the guide holes 25R, 25G, and 25B. For example, not with the screen wall 28R, 28G, 28B interact with some of the emitted electrons leaving from these exit holes 27R, 27G, 28B-13-200409169 (9) Description of the invention The continuation sheet can be reduced.-These electrons have greater energy than secondary electrons, and affect the electron Beam EBR, EBG, EBB images.

The module 20 includes an aluminum oxide (Al203). The corresponding starting surfaces of the guide holes 25R, 25G, and 25B are the inlets 孑 L 26R, 26G, and 26B, that is, the circular 孑 L openings have a diameter of, for example, 2.5 mm. The relatively small back sides of the guide holes 25R, 25G, 25B are such outlet holes 27R, 27G, 27B, i.e., circular holes having a diameter of, for example, 40 mm. The angle at which the screen walls 28R, 28G, 28B extend to the central axes 29R, 29G, 29B is usually between 30 and 60 degrees, for example, 35 degrees. The first electrodes 34, 35, and 36 are arranged concentrically with the reflective electrodes 31, 32, and 33 on the surface 22. The reflective electrodes 31, 32, 33 and the first electrodes 34, 35, 36 together form a planar electronic lens, and have a thickness L 1 of, for example, 2.5 mm. This electrode structure is achieved by vapor-depositing a metal layer on a part of the surface 2 2. The metal layer contains, for example, chromium and aluminum. Subsequently, the desired structures of the reflective electrodes 31, 32, 33 and the first electrodes 34, 35, 36 may be provided in a metal layer. The module 20 contains an insulating material such as aluminum oxide (Al203), which is partially charged during operation. If this happens, the electric field near the exit holes 27R, 27G, 27B and the shape of the electron beam EB near the exit holes 27R, 27G, 27B will change to an unwanted range. Therefore, it is desirable if the electrodes 3 to 36 cover the largest part of the surface 22 near the outlet holes 27R, 27G, 27B. As a result, due to the charging of the module 20, electric field disturbance can be prevented as much as possible. Fig. 3 shows an exit hole with related reflective electrodes 31 and the first electrode 34. -14- 200409169 (ίο) Description sheet 27R. The structures of the reflective electrodes 32 and 33 of the other exit holes 27G and 27B and the first electrodes 35 and 36 are the same, and are not shown in the figure. The reflective electrode 3 1 has a circular shape 'with a straight position D 2 and has a hole through which electrons exit at a position of the exit hole 2 7 r. The straight opening ①D 1 of the orifice is substantially the diameter of the outlet hole 2 7 R, for example 40 mm. The first electrode 34 includes four portions 34A to 34D and has a circular aperture with an internal diameter D 3, wherein the corresponding reflective electrodes 3 丨 are arranged concentrically. The distance d3-D2 between the first electrode 34 and the reflective electrode 31 should be modified so that the vacuum between the electrodes 31 and 34 is not discharged under the influence of the electrode difference between the electrodes 31 and 34. For this purpose, D2 is, for example, 200 mm 'and D3 is, for example, 225 mm. The first part 34A and the second part 34B are located on both sides of the exit hole 27R in the vertical direction, and in operation, can receive the first voltage v. The third part_ the knife 34C and the fourth part 34D are in the horizontal direction Both sides of the exit hole 27R are operable to receive a second voltage V2. The electron beams EBR, EBG, and EBB are focused through the main lens 50_ on the display screen 3. A focusing electrode 45 for accelerating the exiting electrons approaching the exit holes 27R, 27G, 27B is located between the module 20 and the main lens 50, and is also a DAF element to compensate for astigmatism and defocusing. 40. Due to the action of the DAF element 40 and the deflection device 2, a point can be obtained in an elliptical shape with a large difference in the horizontal direction close to the edge, especially at the corner of the display screen 3. To compensate for this large difference, the first voltage V1 is then a variable voltage, for example, and the second voltage V2 is a fixed voltage. -15-200409169

(Π) The variable electric voltage VI is changed according to the impact points of the electron beams EBR, EBG, and EBB on the display screen 3. In particular, the variable voltage v 1 is similar to the electron beams EBR, EBG, and EBB which are closer to the corners of the display screen 3. Therefore, an electron passthrough can be formed using the first electrodes 34, 35, 36, so that the larger difference 0 can be compensated in the horizontal direction of the electron beam e B near the edge of the display screen 3.

If the electron beams EBR, EBG, and EBB strike at the center of the display screen, the first voltage V1 and the second voltage V2 will be substantially equal to, for example, two 600 volts using this voltage. This diameter of 50 mm is supplied to the electron beams EBR, EBG, EBB. The decrease in the first voltage VI depends on the impact points of the electron beams EBR, EBG, and EBB on the display screen 3. For example, near the corner E of the display screen 3, the first voltage VI is equal to 550 volts, and the second voltage V2 is equal to 600 volts. Alternatively, the second voltage V2 may be dynamically changed, and the first voltage VI may be a fixed voltage; or, the first voltage VI and the second voltage V2 may be dynamically changed. On the electron beam EB, through the first electrodes 34, The effect of the quadrupole lens formed by 35 and 36 is shown in FIG. 4. The point SA is an image of the electron beams EBR, EBG, and EBB near a corner of the display screen 3 in a known display tube using the convergence biasing device 2. It can be seen that the point SA has an elliptical core whose long axis is consistent with the horizontal direction. In the vertical direction, the point SA is over-focused, so a blur will extend from the vertical core. -16- 200409169 (12) Description of the invention Continued g At the point s®, excessive focus in the vertical direction can be compensated because the display tube has a DAF element 40. The electron beam forming device 30 can form an electron optical lens to reduce the electron beam EB in the vertical direction and enlarge it, and if necessary, it can enlarge it in the horizontal direction. By increasing the voltage difference V2-V1 determined by the impact points of the electron beams EBR, EBG, and EBB, the electron lens can become more powerful, and the electron beams EBR, EBG, and EBB can be reduced in the vertical direction. In this way, the differences between the points SA and SB can be compensated in the horizontal direction. The electron beam EBR, EBG, and EBB images are substantially the same on the entire display screen 3 at present. The reduced electron beam in the vertical direction has a smaller aperture angle in the vertical direction close to the display screen. As a result, the dots in the vertical direction are enlarged and have a desired shape displayed on the entire display screen 3, such as the dot SC. A selective structure has circular reflective electrodes 131, 132, 133 and first electrodes 134, 135, 136. These are composed of eight portions 134A to 134H, 135A to 135H, 136A to 136H near the exit holes 127R, 127G, 127B. Composed of. The reflective electrodes 131, 132, 133 can receive a fixed reflected voltage Vhop. This selective electrode structure is the exit hole 127R shown in FIG. The other exit holes 127G, 127B have the same structure as the related first electrode portions 135A to 135H, 136A to 136H. Each of the eight sections 134A to 134H is enlarged along the reflective electrode 131 at an angle of about 45 degrees and separated by a gap, wherein the gap has no electrical breakdown under the influence of the voltage difference applied to the sections 134A to 134H The size that occurs in the gap. In the horizontal direction, the portions 134A, 134E are two 20040069i69 located at the exit hole 127R (13) Description of the invention continued on the margin. In the vertical-straight direction, the portions 134C, 134G are located on both sides of the exit hole 127R. The angular portions 134B, 134D, 134F, and 13A are located on diagonal lines on both sides of the exit hole 127R. This structure can form a beam forming element 'having greater flexibility and can be used for various purposes.

For example, correction of a lens error such as a deformed main lens is possible in using this structure. For this purpose, a fixed voltage of 600 volts is applied to sections 134A, 134C, 134E, 134G, and a fixed voltage of 550 volts is applied to sections 134B, 134D, 134F, 134H, for example. This structure also has advantages when using these square outlet holes 127R, 127G, 127B. By applying a lower voltage near the corners of the exit holes 127R, 127G, 127B, electron beams EBR, EBG, and EBB are available, and the electron beams have a more rounded shape than the exit holes 127R, 127G, 127B. These electron beams EBR, EBG, and EBB are more shaped according to the desired display.

The voltages V1 and V2 have dynamic elements, so that the electron beams EBR, EBG, and EBB can be formed using the maximum flexibility. This is due to, for example, the impact points of the electron beams EBR, EBG, and EBB on the display screen 3. For example, this may be advantageous if the magnetic field of the biasing device 2 is considerably stronger than higher-order elements. 0 is advantageous for controlling the sections 134A to 134H, 135A to 135H, 136A to 136H using more than two independent voltages. A color display device according to the present invention is shown in FIG. The color display device includes a specific embodiment of a cathode ray tube as shown in FIG. The display screen 3 has rows and columns of pixels, and has red, green, and blue light quality. -18-200409169 (14) Description of the invention continued:. Each of the electric sub-beams EBR, EBG, and EBB is one of these scale qualities corresponding to the display screen 3. The module 20 has corresponding guide holes 25R, 25G, 25B of each color. The display device can receive the displayed drawing information, which can be converted into position signals px, py and modulation signals pR, pG, pB.

The position signals Px and Py are applied to a bias circuit D to generate a bias current for controlling the biasing device 2. The electron beams EBR, EBG, and EBB can be deflected on the entire display screen 3, so the electron beams EBR, EBG, and EBB can strike each pixel on the display screen 3. When the electron beam currents corresponding to the electron beams EBR, EBG, and EBB are relatively large, the krypton quality of this pixel will then emit cold light to a stronger range. The modulation signals PR, PG, and PB are respectively applied to the electron sources 10R, 10G, and 10B to control the electron emission through the electron sources 10R, 10G, and 10B, thereby adjusting the electron beams EBR, EBG, and EBB. Electron beam current.

The color displayed through a specific pixel of the display screen 3 can thus be changed according to the drawing information. The electron beams EBR, EBG, EBB can strike each pixel, for example, 50 or 100 times per second. In addition, the position signals Px, Py are applied to a reflection circuit ’'to supply the voltages V1 and V2 to the module 2 2 0. In particular, the reflection circuit Η can change the voltage difference ν2-νι, which depends on the position signals Px, py. The voltage difference V2-V1 increases at a place where the electron beams EBR, EBG, and EBB strike further away from the center C of the display screen 3. As a result, when the deflection is large, the electron beams EBR, EBG, and EBB near the exit holes 27R, 27G, and 27B become more elliptical in the vertical direction. As mentioned above, 'in the horizontal direction-19- 200409169 (15) The ellipticities of the electro-subbeam EBR, EBG, and EBB on the continuation sheet can be compensated, so the electron beam EBR, EBG, and EBB are on the entire display screen 3. It will be substantially the same, and the desired quality image can be displayed on the entire display screen. Although the present invention has been described with reference to some specific embodiments, these specific embodiments are not limited. The scope of the patent application in the appendix of the present invention also includes any variations that are known to those skilled in the art to describe specific embodiments. The present invention emphasizes that it is often useful to compensate for electron beam distortion that occurs between the exit hole and the display screen. Non-limiting examples of φ are compensation for the influence of the deflection field of some electron beams, compensation for lens errors of the main lens, misalignment of alignment that occurs during the manufacture of the electron optical system, or compensation for any component changes in the display tube that affects the electron beam. Any reference signs placed between parentheses shall not constitute a restriction on patent application. The use of the verb " include " and its variations do not exclude elements other than those described in the application—the scope of the patent. The article π- "before the element does not exclude other than a plurality of elements. Brief description of the drawing 0 Fig. 1 shows a specific embodiment of a cathode ray tube according to the present invention; Fig. 2 is a mold used in a cathode ray tube Group side elevational view; FIG. 3 is a front end front view of a first embodiment of a cathode ray tube electrode structure according to the present invention; FIG. 4 is a view showing a known cathode ray tube and a cathode ray line according to the present invention. Point of the tube; Figure 5 is a front elevational view of a second embodiment of an electrode structure; and Figure 6 is a display device including a cathode ray tube according to the present invention. -20- 200409169 (16)

Description of the invention continued I Schematic representation of symbols 1 2 3 10R, 10G, 10B 15R, 15G, 15B 20 30 40 45 50 21, 22 31, 32, 33, 131 27R, 27G, 27B 26R, 26G, 26B 28R, 28G , 28B 25R, 25G, 25B 34A ~ 34D, 35A ~ D, 36A ~ 36D 134A, 134B, 134C,

134D, 134E, 134F, 135G 29R, 29G, 29B Electron deflecting device display screen electron source second electrode module electron beam forming device correction element focusing electrode main lens surface reflection electrode exit hole entrance hole screen wall guide hole electrode first Electrode central axis

137 exit hole -21-

Claims (1)

200409169 Patent application scope 1 · A display tube, which includes: an electron source (10R, 10G, 10B) for emitting electrons; a module (20), which includes: a guide hole (25R, 25G, 25B), the guide hole has an entrance hole (26R, 26G, 26B), and an exit hole (27R, 27G, 27B) located on the back of the module (20); and a screen wall (28R, 2 8G, 2 8B) to emit the secondary electrons after receiving the electrons; an electron beam forming device (30) to form an electron from the secondary electrons at the position of the exit hole (27R, 27G, 27B) Beam (EBR, EBG, EBB), and a display screen (3) for receiving the electron beam (EBR, EBG, EBB), and generating an image through the electron beam (EBR, EBG, EBB), its characteristics The electron beam forming device (30) is an electron lens formed by changing the shape of the electron beam (EBR, EBG, EBB) to at least partially compensate the exit holes (27R, 27G, 27B) and the display screen (3 Undesired changes in the shape of the electron beam (EBR, EBG, EBB). 2. The display tube according to item 1 of the scope of patent application, characterized in that the electron beam forming device (30) includes a first electrode (34, 35, 36), the first electrode is divided into at least four parts (34A to 34D; 35A to 35D; 36A to 36D), in operation, it can receive at least two different voltages (VI, V2). 3. The display tube according to item 1 of the scope of patent application, characterized in that the electron lens includes a quadrupole lens. 4 · If the display tube of the scope of application for patents 2 and 3 is characterized in that a first part (34A, 35A, 36A) and a second part (34B, 35β '36B) are located in the 200409169 first direction Both ends of the exit hole (27R, 27G, 27B), and in operation, receive a first voltage (VI), and a third part (34C, 35C, 36C) and a fourth part (34D, 35D, 36D) ) Are located on both sides of the exit hole (27R, 27G, 27B) in a second direction perpendicular to the first direction, and in operation, receive a second voltage (V2). 5. The display tube according to item 1 of the scope of patent application, characterized in that the self-convergence biasing device (2) is provided for changing the impact point of the electron beam (EBR, EBG, EBB) on the display screen (3), And the shape of the electron beam (EBR, EBG, EBB) will change dynamically. This change is due to the impact point of the electron beam (EBR, EBG, EBB) on the display screen (3). 6. The display tube according to item 5 of the scope of patent application, characterized in that a main lens (50) is arranged between the module (20) and the deflection device (2) for displaying on the display-screen (3 ) Produces an image of the exit hole (27R, 27G, 27B); and a correction ~ positive element (40) to compensate for the defocusing phenomenon between the module (20) and the main lens (50). 7 · The display tube according to item 1 of the patent application scope, characterized in that the electron beam forming device (30) includes a reflective electrode (31, 32, 33) for guiding the guide holes (25R, 25G, 25B) ) To transport the secondary electrons substantially toward the exit holes (27R, 27G, 27B). 8 · If the display tube in the scope of patent application Nos. 2 and 7 is characterized in that the reflective electrode (31, 32, 33) and the first electrode (34, 35, 36) are substantially close to the module (20 ) On the same plane on the back side, the reflective electrode (31, 32, 33) is located in an aperture of the first electrode (34, 35, 36). 9 · If the display tube of the scope of patent application No. 2 is characterized by the first electrode • 2-200409169 The patent application scope of the continuation (34, 3 winter, 36) four parts (34A to 34D; 35A to 35D; 36A to 36D) have substantially the same surface. 10. The display tube according to item 1 or 3 of the scope of patent application, characterized in that the electron lens formed by the electron beam forming device (30) includes an even-order multi-polar lens higher than a fourth-order. 11. As shown in the patent application scope of the 2nd and 10th display tubes, characterized in that the first electrode (34, 35, 36) has 8 j fixed p points (34Ai4 34H, 35A to, j 35H, 36A to ij 36H ). 12. A display device comprising a display tube within the scope of any of the previous patent applications.