CN1067198C - Compensation device and method for keystone distortion in north-south direction - Google Patents
Compensation device and method for keystone distortion in north-south direction Download PDFInfo
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- CN1067198C CN1067198C CN96114432A CN96114432A CN1067198C CN 1067198 C CN1067198 C CN 1067198C CN 96114432 A CN96114432 A CN 96114432A CN 96114432 A CN96114432 A CN 96114432A CN 1067198 C CN1067198 C CN 1067198C
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Abstract
The present invention relates to a compensation device for keystone distortion in north-south direction and a method thereof, which is used for the compensation of the distortion phenomenon of an upper end horizontal line and a lower end horizontal line of a screen of a cathode ray tube in a terminal machine or a television. The method of the compensation device for keystone distortion in north-south direction comprises the following steps: direct current signal is generated by a direct current generator, and a periodic ramp signal is generated by a ramp signal generator; a synthesized signal is generated by the addition of the direct current signal and the ramp signal by a synthesizer; the power of the synthesized signal is amplified by a driving device, the driving device drives a rotating coil device surrounding the adjacent position of the neck of the cathode ray tube, and magnetic force generated by the rotating coil device can deflect an electronic beam in the cathode ray tube to carry out the compensation of the keystone distortion in the north-south direction.
Description
The present invention system is about the compensation arrangement and the method for the distortion of a kind of terminating machine screen, particularly relevant for a kind of compensation arrangement and method of keystone distortion in north-south direction, in order to compensate the horizontal distortion phenomenon of a screen upper and lower side.
No matter be employed cathode ray tube in computer terminals or the television set, owing to, make it can't directly demonstrate a rectangular normal screen image, and can produce every distortion phenomenon such as not parallel or asymmetric on how much by the relation of kind of factor.Figure 1A to Fig. 1 F shows some transmeridional trapezoidal (Trapezpoidal) distortions.The transmeridional trapezoidal distortion of this kind mainly is to cause because the deflecting coil (yoke) on the cathode ray tube can't reach perfect institute in general manufacture process.Come its cathode ray tube of quality control by general cathode ray tube manufacturers manufacturer to make specification by oneself, yet, for some use to go up require tighter situation or for as large-size cathode ray tube more than 17,21 o'clock, its distortion situation can be comparatively obvious by naked eyes; Therefore, this transmeridional trapezoidal distortion is revised with some compensating circuits by the chamber of commerce of general terminating machine manufactory.
Fig. 2 A to Fig. 2 D shows some transmeridional barrel shapes (pincushion is called the pincushion type again) distortion situation.This transmeridional barrel shape distortion mainly is because the display screen of surface of cathode-ray tube is not that a real sphere causes.Usually, general terminating machine manufacturer is that deflection current with the control terminal machine circuit compensates.For example, for the distortion phenomenon of Fig. 2 C, can make its length longer via control deflection electric current, and the length of scanning line at two ends be shorter about being positioned at, to reach compensating action at the horizontal scanning line of central part.
Fig. 3 A to Fig. 3 D shows barrel shape (pincushion is called the pincushion type again) the distortion situation in some north-souths.The barrel shape distortion in this north-south mainly also is because the display screen of surface of cathode-ray tube is not that a real sphere causes.Usually, general cathode ray tube is made manufacturer and is adjusted with the control deflecting coil.Though its adjusted situation is not very desirable, general terminating machine is made manufacturer and all can not done further correction or improvement again, unless run into some use go up require tighter situation or for as large-size cathode ray tube more than 17,21 inch.
Fig. 4 A to Fig. 4 F shows trapezoidal (Trapezoidal) distortion in some north-souths.Usually general cathode ray tube manufacturers manufacturer comes its cathode ray tube of quality control to make specification by oneself, yet, for some use to go up require tighter situation or for as large-size cathode ray tube more than 17,21 o'clock, its distortion situation can be comparatively obvious by naked eyes; Yet further correction or improvement are not all done to it again by general terminating machine manufacturer; And, effective compensation method is proposed to improve the trapezoidal distortion phenomenon in this north-south to also having no talent so far.
Fig. 5 shows the schematic diagram of a cathode ray tube 50, advances to be surrounded with a revolving coil 52 (rotate coil is called tilt again) in that its neck is attached; This revolving coil is the compensation arrangement that is used as the crooked rotation of screen, yet it is not used as the compensation of keystone distortion in north-south direction.In addition, the device of number in the figure 54 is the previous deflecting coil of mentioning.
In the foregoing invention background, many geometric distortion situations that traditional cathode ray tube is produced on making, main purpose of the present invention is providing the trapezoidal distortion of a kind of device and method with the compensation north-south.
According to the above purpose, the invention provides a kind of compensation arrangement of keystone distortion in north-south direction, be used to compensate a terminating machine or the uneven distortion phenomenon of television set inner cathode ray tube screen upper and lower side horizontal line.Produce a direct current signal with the direct current generation device, and with the together periodic ramp signal of generation one of ramp signal generation device and vertical scanning frequency.This direct current signal and ramp signal with synthesizer, are for example produced a composite signal after the adder addition.Via drive unit, for example amplifier to be amplifying the power of composite signal, and drives a ring and burn near the neck of a cathode ray tube revolving coil device, and the electron beam in the magnetic force deflection cathode ray tube that it produced is with the trapezoidal distortion in compensation north-south.
The present invention provides a kind of compensation method of keystone distortion in north-south direction in addition, is used to compensate a terminating machine or the horizontal distortion phenomenon of television set inner cathode ray tube screen upper and lower side.At first, produce the ramp signal of a direct current signal and one-period property, again this direct current signal and ramp signal are produced a composite signal mutually, and the direct current position standard of this composite signal is determined by the big or small of direct current signal.Then, amplify the power of composite signal.At last, according to the composite signal size after amplifying, to produce a corresponding magnetic force, the electron beam in this magnetic force meeting deflection cathode ray tube is to reach the purpose of compensation keystone distortion in north-south direction.
Figure 1A to Fig. 1 F shows some transmeridional trapezoidal (Trapezoidal) distortion situations.
Fig. 2 A to Fig. 2 D shows some transmeridional barrel shape (pincushion) distortion situations.
Fig. 3 A to Fig. 3 D shows barrel shape (pincushion) the distortion situation in some north-souths.
Fig. 4 A to Fig. 4 F shows trapezoidal (Trapezoidal) distortion situation in some north-souths.
Fig. 5 is the schematic diagram of cathode ray tube and revolving coil.
Fig. 6 shows apparatus function calcspar of the present invention.
Fig. 7 A to Fig. 7 D shows that the voltage that adds to revolving coil is greater than or less than benchmark constant signal V
rVoltage the time, the relativeness of the original screen scanning when being subjected to the screen scanning that revolving coil influences and not influenced by revolving coil.
Fig. 8 A to Fig. 8 F shows the ramp signal figure corresponding to the required generation of trapezoidal distortion situation in the various north-souths of Fig. 4 A to Fig. 4 F.
When Fig. 9 A to Fig. 9 F then shows corresponding to the ramp signal of Fig. 8 A to Fig. 8 F, the original relativeness of the screen after the screen compensation that scanner uni produces scanning.
Figure 10 A shows the end view of the copper revolving coil that most preferred embodiment is used.
Figure 10 B shows the perspective view of the copper revolving coil that most preferred embodiment is used.
Figure 11 shows method flow diagram of the present invention.
Fig. 6 shows apparatus function calcspar of the present invention, and wherein direct current generation device 60 is in order to produce a direct current signal, and this direct current signal can be direct voltage or direct current.Ramp signal generation device 62 is in order to produce the ramp signal of one-period property, and its cycle is identical with the vertical frequency cycle of controlled cathode ray tube 68 screens scanning.Direct current generation device 60 above-mentioned and ramp signal generation device 62 can be as traditional direct voltage or direct current circuit and ramp signal generation circuit.Synthesizer 64, a traditional analog adder for example, in order to direct current signal and ramp signal are produced a composite signal mutually, and the direct current position standard of composite signal is determined by the size of direct current signal.Then, this composite signal is by a drive unit 66, in order to amplify power or its electric current of composite signal.This drive unit 66 can be traditional power amplifier or traditional current driving circuit, and, when direct current signal equals a benchmark constant signal V
rAnd when ramp signal was zero, the composite signal that is amplified was zero.Then, the composite signal after again this being amplified is connected near the revolving coil 69 the neck that is surrounded on cathode ray tube 68.Electric current in this revolving coil 69 can produce a field of magnetic forece according to distracted law, and the electron beam in the cathode ray tube 68 produces an electron stream simultaneously; This electron stream is subjected to the magnetic force that revolving coil 69 is produced, and bright Left Hand Rule can be subjected to the influence of a deflecting force according to Buddhist, and the electron beam that is offset is got on the screen thereby the trapezoidal distortion phenomenon in compensation north-south.
Fig. 7 A show when the voltage that add to revolving coil 69 or electric current greater than benchmark constant signal V
rVoltage the time, the scanning of then actual screen can as the solid box 70 of Fig. 7 B, and frame of broken lines 72 to be the original screen that not influenced by revolving coil 69 scan; That is the screen scanning 70 that is subjected to revolving coil 69 influences is the counterclockwise rotation.Opposite, shown in Fig. 7 C, when the voltage that adds to revolving coil 69 or electric current less than benchmark constant signal V
rVoltage the time, the scanning of then actual screen can as the solid box 74 of Fig. 7 D, and frame of broken lines 76 to be the original screen that not influenced by revolving coil 69 scan; That is the screen scanning 74 that is subjected to revolving coil 69 influences is rotation clockwise.The magnitude of voltage of above-mentioned suitable, counterclockwise and the revolving coil that adds to 69 is a kind of relative value, that is the circuit system implementation method for different will produce different direction of rotation.
Fig. 8 A figure to 8F figure shows that its cycle 80 equals the vertical cycle of controlled cathode ray tube screen corresponding to the ramp signal figure of the required generation of trapezoidal distortion situation in the various north-souths of Fig. 4 A to Fig. 4 F.When Fig. 9 A to Fig. 9 F then showed corresponding to the ramp signal of Fig. 8 A to Fig. 8 F, originally screen scanning (shown in the solid box) and institute produced the situation that screen after compensating scans (shown in the frame of broken lines).When composite signal greater than reference signal V
rThe time, the horizontal line of a screen wherein end up and down can be subjected to deflection, for example shown in Fig. 9 A and Fig. 9 D.When composite signal less than reference signal V
rThe time, the horizontal line of a screen wherein end up and down can be subjected to clockwise direction deflection, for example shown in Fig. 9 B and Fig. 9 C.Yet because the slope of ramp signal is positive and negative opposite, so the situation shown in the direction of rotation of Fig. 9 B and Fig. 9 C and Fig. 9 A and Fig. 9 D is just opposite.When the part of composite signal greater than reference signal V
rAnd another part is less than reference signal V
rThe time, then the horizontal line on both sides all can be subjected to deflection about the screen, shown in Fig. 9 E and Fig. 9 F.The slope size of each ramp signal is then controlled by circuit, and the size that should look trapezoidal distortion is adjusted the size of ramp signal.That is distortion greatly then is provided with bigger ramp signal to compensate it; Otherwise distortion is little then to be provided with less ramp signal.
Figure 10 A shows the used copper revolving coil end view of most preferred embodiment, and the bore of its copper cash figure is approximately 0.2 centimetre; Figure 10 B then shows its perspective view.
Figure 11 shows method flow diagram of the present invention.Its step is as follows: at first, produce a direct current signal (step 110), this direct current signal can be direct voltage or direct current; And the ramp signal (step 111) of generation one-period property, its cycle is identical with the vertical frequency cycle of controlled cathode ray tube screen scanning.Then, in step 112 direct current signal and ramp signal are produced a composite signal mutually, the direct current position standard of this composite signal is determined that by the size of direct current signal the slope size of composite signal is then determined by the controlling value of ramp signal generation circuit.Amplify the power or the electric current (step 113) of composite signal, and in step 114 according to the size of the composite signal after amplifying, producing a corresponding magnetic force, and the electron beam of this magnetic force in can deflection cathode ray tube is with the trapezoidal distortion in compensation north-south.The generation of this magnetic force is normally produced by near the revolving coil the neck that is surrounded on cathode-ray tube.
The above is preferred embodiment of the present invention only, is not in order to limit the present patent application claim; All other do not break away from the equivalence of being finished under the disclosed spirit and changes or modification, all should be included in the appended claims scope.
Claims (22)
1. the compensation arrangement of a keystone distortion in north-south direction is to be used to compensate the horizontal distortion phenomenon of a screen upper and lower side, it is characterized in that, comprises:
One direct current generation device is in order to produce a direct current signal;
One ramp signal generation device is in order to produce the ramp signal of one-period property;
One synthesizer, in order to this direct current signal and this ramp signal are produced a composite signal mutually, the accurate system in the direct current position of this composite signal is determined by the size of this direct current signal;
One drive unit is in order to amplify the power of this composite signal; And
One revolving coil device, near the also input of neck that is surrounded on a cathode ray tube is via this composite signal that this drive unit amplified, and the magnetic force that this revolving coil device is produced is in order to the trapezoidal distortion of the electron beam in this cathode ray tube of deflection with the compensation north-south.
2. device as claimed in claim 1 is characterized in that the vertical cycle of the cycle of above-mentioned ramp signal for this screen.
3. device as claimed in claim 1 is characterized in that above-mentioned synthesizer comprises an analog adder.
4 devices as claimed in claim 1 is characterized in that above-mentioned drive unit comprises a power amplifier.
5. device as claimed in claim 1 is characterized in that when above-mentioned direct current signal equals a reference signal and this ramp signal and is zero, is zero from this composite signal of this drive unit output.
6. device as claimed in claim 5, when it is characterized in that above-mentioned composite signal greater than this reference signal, this horizontal line of this screen wherein end up and down can be subjected to deflection.
7. device as claimed in claim 5 is characterized in that when above-mentioned composite signal during less than this reference signal, this screen up and down wherein this horizontal line of an end can be subjected to deflection.
8. device as claimed in claim 5, it is characterized in that when the part of above-mentioned composite signal greater than this reference signal and another part during less than this reference signal, this screen this horizontal line on both sides up and down all can be subjected to deflection.
9. device as claimed in claim 8 is characterized in that the horizontal yawing moment in above-mentioned screen both sides is opposite.
10. device as claimed in claim 1 is characterized in that above-mentioned revolving coil device comprises a revolving coil.
11., it is characterized in that above-mentioned revolving coil is a copper coil as the device of claim 10.
12., it is characterized in that the bore of above-mentioned copper coil is approximately 0.2 centimetre as the device of claim 11.
13. the compensation method of a keystone distortion in north-south direction is used to compensate the horizontal distortion phenomenon of a screen upper and lower side, it is characterized in that comprising the following step:
Produce a direct current signal;
Produce the ramp signal of one-period property;
This direct current signal and this ramp signal are produced a composite signal mutually, and the accurate system in the direct current position of this composite signal is determined by the size of this direct current signal;
Amplify the power of this composite signal; And
According to the size of the composite signal after this amplification, to produce a corresponding magnetic force, the electron beam in this this cathode ray tube of magnetic force meeting deflection is with the trapezoidal distortion in compensation north-south.
14., it is characterized in that the vertical cycle of the cycle of above-mentioned ramp signal for this screen as the method for claim 13.
15 methods as claim 13, when it is characterized in that above-mentioned direct current signal equals a reference signal and this ramp signal and is zero, this composite signal that is amplified is zero.
16., it is characterized in that the step of above-mentioned generation composite signal comprises as the method for claim 15:
Produce a composite signal greater than this reference signal, make this horizontal line of this screen wherein end up and down be subjected to deflection.
17., it is characterized in that the step of above-mentioned generation composite signal comprises as the method for claim 15:
Produce a composite signal less than this reference signal, make this horizontal line of this honor curtain wherein end up and down be subjected to deflection.
18., it is characterized in that the step of above-mentioned generation composite signal comprises as the method for claim 15:
Produce this composite signal, the part of this composite signal is greater than this reference signal and another part during less than this reference signal, with this screen of deflection this horizontal line on both sides up and down.
19., it is characterized in that the horizontal yawing moment in above-mentioned screen both sides is opposite as the method for claim 18.
20., it is characterized in that above-mentioned magnetic force is produced by a revolving coil as the method for claim 13.
21., it is characterized in that above-mentioned revolving coil is a copper coil as the method for claim 20.
22., it is characterized in that the bore of above-mentioned copper coil is approximately 0.2 centimetre as the device of claim 21.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96114432A CN1067198C (en) | 1996-11-07 | 1996-11-07 | Compensation device and method for keystone distortion in north-south direction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96114432A CN1067198C (en) | 1996-11-07 | 1996-11-07 | Compensation device and method for keystone distortion in north-south direction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1182325A CN1182325A (en) | 1998-05-20 |
| CN1067198C true CN1067198C (en) | 2001-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96114432A Expired - Fee Related CN1067198C (en) | 1996-11-07 | 1996-11-07 | Compensation device and method for keystone distortion in north-south direction |
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|---|---|
| CN (1) | CN1067198C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200501739A (en) * | 2002-12-06 | 2005-01-01 | Koninkl Philips Electronics Nv | Frame drive apparatus and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076575A (en) * | 1992-03-17 | 1993-09-22 | 松下电器产业株式会社 | On/top/bottom pincushion correction circuit |
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1996
- 1996-11-07 CN CN96114432A patent/CN1067198C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076575A (en) * | 1992-03-17 | 1993-09-22 | 松下电器产业株式会社 | On/top/bottom pincushion correction circuit |
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| Publication number | Publication date |
|---|---|
| CN1182325A (en) | 1998-05-20 |
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