CN1153585A - Improvement of brightness uniformity on display screen - Google Patents
Improvement of brightness uniformity on display screen Download PDFInfo
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- CN1153585A CN1153585A CN 96190467 CN96190467A CN1153585A CN 1153585 A CN1153585 A CN 1153585A CN 96190467 CN96190467 CN 96190467 CN 96190467 A CN96190467 A CN 96190467A CN 1153585 A CN1153585 A CN 1153585A
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- display screen
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Abstract
A method for improving brightness uniformity reduces a decrease of light towards the edges of a display screen (10) of a display tube (1). The extent of the decrease of light particularly depends on an increase of the thickness of the glass of the display screen (10) from the center of the display screen (10) to its edges, and on a transmission of the glass. This decrease of light is corrected by causing the deflection rate to decrease (C1, Cs) from the center of the display screen (10) towards its edges.
Description
The present invention relates to be used to improve the method and the correcting circuit of brightness uniformity on the display screen of picture tube, this picture tube also is equipped with control electrode, this method comprises: drive this control electrode so that in picture tube, produce modulated electron beam in response to picture intelligence, and this modulated electron beam of deflection so as on display screen the displayed image signal.
The present invention also relates to be equipped with the display unit of such correcting circuit.
The image display apparatus that chromoscope is housed is well-known, this image display apparatus has and is used for the display screen of displayed image signal thereon, be used to produce the electron gun of three-beam electron-beam, and generation is used for the level of deflection beam and the deflection unit of vertical deflection field.Three-beam electron-beam is united and is constituted a composite electron bundle, its many row that draw on display screen under the control of deflection unit.Three-beam electron-beam is modulated by pictorial information, so that the luminous quantity of each position of influence on display screen.Light quantity is subjected to the influence the electron amount of the intrafascicular per second appearance of given position composite electron (so-called is the electron beam current value) significantly.This image of knowing shows that people's device has such shortcoming, and promptly light quantity reduces along with the edge that trends towards display screen, thereby the brightness uniformity on the display screen is interfered.Reduce particularly because the thickness of glass of display screen begins to increase gradually from this screen center causes towards the light quantity of the edge direction of display screen.Make the light transmission of glass become more and more littler in order to improve the black level on the display screen, thereby the minimizing of light quantity become more and more obvious.The brightness uniformity of this multilated can become high-visible with the constant electronic beam electronic current when modulated composite electron bundle is write on the display screen, thereby irksome.
An object of the present invention is to provide a kind of method and a kind of correcting circuit so that improve brightness uniformity on the display screen of picture tube, and improved display unit is provided.
For this reason, a first aspect of the present invention provides the method for the improvement brightness uniformity that limits as claim 1, wherein the ratio of width to height of the ratio of width to height of picture intelligence and display screen is corresponding, it is characterized in that, the method comprises that another influences the step of deflection, is used to make the deflection speed of modulated electron beam to reduce towards the edge from the display screen center.This is different from common display unit, and the latter's deflection speed (translational speed of electron beam when sweeping away display screen) is made invariable in entire display screen as far as possible, to reach the best geometric figure of the information of being shown.
A second aspect of the present invention provides the display unit that is used to improve brightness uniformity that limits as in the claim 6, it is characterized in that, display unit also comprises means for correcting, is used for making the deflection speed of electron beam to reduce brightness uniformity to be improved in this wise from display screen mind-set edge.
A third aspect of the present invention provides the correcting circuit that limits as in the claim 8.
A fourth aspect of the present invention provides the method that limits as in the claim 9, it is characterized in that, the method comprises that another influences the step of deflection, be used for making the deflection speed of electron beam to reduce from display screen mind-set edge, at least by this way reduce to follow the deflection speed of direction, compensated basically so that export the minimizing that follows direction at the position of at least one frame light.
A fifth aspect of the present invention provides the method that limits as in the claim 10, it is characterized in that, the method comprises influences deflection so that the deflection speed of the electron beam step that mind-set edge reduces from display screen, and influences moment that picture intelligence occurs to reduce the other step of the site error on the display screen.
Advantageous embodiments of the present invention is defined in the dependent claims.
The brightness uniformity that improves by this way on the display screen is based on such understanding, and promptly luminous quantity depends on the speed of the electron beam deflecting.In fact, slower electron beam can make the given position that has more electronics to get to display screen in the per second, and luminous quantity just increases like this.By influencing deflection so that the deflection speed of electron beam reduce towards the edge of display screen, can be partly or compensate fully towards the light quantity at display screen edge and reduce.
The present invention preferably reduces towards the light quantity minimizing at display screen edge and needn't increase electron beam current.Therefore, the spot definition of modulated electron beam can not be subjected to negative effect on display screen.
From EP-A-0,567,301 as can be known, and in order to be the pictorial information that shows the ratio of width to height with 16: 9 on 4: 3 the display screen in the ratio of width to height, horizontal deflection is slowed down when trending towards the vertical edge of display screen.As reaching a this possibility method that slows down, can give the S corrective capacity that is in series with line deflector coil a too small value.Like this, pictorial information entirely is filled on whole display screens and does not appear at the irritating geometric distortion at display screen center.This purpose that slows down the known method of horizontal deflection when the vertical edge of trend display screen is not in order to reduce the light quantity minimizing at trend display screen edge.
When completely or partially compensating the light quantity minimizing according to a first aspect of the present invention, pictorial information with given the ratio of width to height is to show on the display screen of (almost) same the ratio of width to height, this be with at EP-A-0,567, situation about disclosing in 301 is different, and promptly the latter compresses the picture intelligence of the ratio of width to height of 16: 9 with on the display screen that is presented at the ratio of width to height with 4: 3.According to the present invention, influence deflection speed so that reducing the minimizing of light quantity is the variation of depending on the thickness of glass of display screen, thereby, usually with according to EP-A-0,567,301 to influence deflection speed inequality so that improve desirable geometric distortion.
EP-A-0,567,301 have also shown an embodiment, it is on 4: 3 the display screen that the pictorial information that wherein has the ratio of width to height of 16: 9 all is presented at the ratio of width to height in a different manner.In this embodiment, the raising vertical deflection speed of the reduction horizontal deflection speed of trend display screen vertical edge and trend display screen horizontal edge combines.In the present invention, if want light quantity minimizing is vertically proofreaied and correct, then must when the horizontal edge of trend display screen, reduce vertical deflection speed.
By influencing deflection speed, picture intelligence will arrive on the display screen by on the position that was offset.According to the embodiment of method of the present invention, its feature such as claim 2 qualification, have such advantage, promptly, can completely or partially be compensated by the displacement that non-constant deflection speed caused by influence the moment of picture intelligence appearance.But the position that picture intelligence occurs modulation of skew mat such as clock or the such known technology of interpolation method in time reaches.In the clock modulation, the image letter for example is written in the memory with a constant clock, reads from memory with V-CLK then.In interpolation method, current picture intelligence utilizes interpolation algorithm is processed into provides correct information in the moment that is offset picture intelligence.
The embodiment of the method that limits in claim 3 only modulates the deflection speed that follows direction.It has such advantage, i.e. pictorial information skew in time can be in a simple manner, for example realize by line storage.In traditional deflection, wherein the row that obtains by means of horizontal deflection continues down line by line along vertical direction, and the deflection that follows direction just is understood that horizontal deflection.In conversion scanning in, wherein the vertical row along continuous straight runs one that is obtained by vertical deflection continues down with being listed as, the deflection that follows direction just is understood that vertical deflection.
The thickness of glass that the embodiment of the method defined in claim 4 is based on different frame position on the display screen follows direction and has different variations.This provides the better compensation to the minimizing of light.
Among the embodiment of the method that limits in claim 5, the degree that the deflection at trend display screen edge slows down is bigger compared with slowing down degree for the minimizing of compensation light is necessary.Final increase in the light quantity at its edge of trend on the display screen can be compensated fully or partly by means of the method that electron beam current is reduced towards the display screen edge time.For this reason, the electron beam current that correction signal can influence modulation to be obtaining the electron beam current through overcorrect and modulation, and it is coming per second to comprise still less electronics towards display screen edge compared with the electron beam current of modulation.Electron beam current by means of reducing to modulate when tending to the edge of display screen can obtain such advantage, and the increase (being referred to as luminous point increases) that promptly tends to the spot definition at display screen edge has been limited.Luminous point is the picture of electron beam on display screen of modulation.The reducing of electron beam current of modulation for example can be by means of the amplitude of controlling the control chart picture signals by known contrast or can be by means of coming the method for the DC level of control chart picture signals to reach by known brilliance control.
Embodiment according to display unit of the present invention, its feature such as claim 7 qualification, being based on such understanding, is by means of proofreading and correct by the parabolic type of deflection speed and obtaining about reducing towards the good result of the minimizing of the light at display screen edge in many picture tubes promptly.This reducing of deflection speed can realize that with suitable too small value this is a kind of simple mode by giving the S-corrective capacity that is in series with relevant deflecting coil.
According to a fourth aspect of the present invention, be affected so that compensate minimizing basically along the variation of the deflection speed of line direction at least, thereby improve brightness uniformity towards the light at display screen edge.For according to the minimizing that compensates light basically of the present invention, its reduce to follow the deflection speed of direction with according to EP-A-0,567,301 compressions have the picture intelligence of 16: 9 the ratio of width to height to be compared to be presented on the display screen with 4: 3 the ratio of width to height, and these two kinds of processes have different the requirement.
For improvement brightness uniformity, deflection is affected so that the deflection speed of electron beam is reduced when the edge of trend display screen according to a fifth aspect of the present invention.The site error of the pictorial information that causes by influencing deflection speed can be reduced by means of influencing the going out now of picture intelligence.As previously described, but the position that picture intelligence occurs modulation of skew mat such as clock or the such known technology of interpolation method in time reach.On the contrary, EP-A-0,567,301 purpose is to introduce deliberate site error, this error increases when trend display screen edge.
These and other aspect of the present invention will become clearly from the embodiments described below, and set forth with reference to these embodiment.
In the accompanying drawings:
Fig. 1 has shown the embodiment according to display unit of the present invention, and
Fig. 2 has shown some waveforms of the display operation that is used for key diagram 1.
Fig. 1 has shown according to display unit of the present invention.Chromoscope 1 is equipped with control electrode 11,12, and 13 and display screen 10.Display screen 10 is furnished with trichromatic fluorescent material (not shown on the figure).From the control signal Vc1 that picture intelligence Pi draws, Vc2, Vc3 drive controlling electrode 11,12,13 is used for being modulated at a plurality of electronics in each electron beam separately.The modulated electron beam of every bundle is relevant with a kind of fluorescent material wherein.Modulated electron beam separately constitutes modulated composite electron bundle.Determined luminous quantity on display screen 10 at the electron amount of the intrafascicular per second of composite electron of this modulation.Deflection circuit 5 comprises field deflection coil Lv and line deflector coil Lh, and is used for Driving Field and line deflector coil Lv, the deflecting driving circuit 50 of Lh.Deflecting driving circuit 50 receives vertical sync information Vs and horizontal sync information Hs, it is drawn by synchronous circuit 6 according to picture intelligence Pi, this synchronous circuit produces on the scene and line deflector coil Lv, among the Lh and field and horizontal deflection electric current I the v synchronous sawtooth waveform of picture intelligence Pi, Ih.
Waveform generating circuit 4 reception levels and vertical sync information Hs, Hv, and the first correction signal C1 is added to deflecting driving circuit 50, the second correction signal C2 is added to time correction circuit 3 and the 3rd correction signal C3 is added to electron beam current correcting circuit 2.Time correction circuit 3 also receives picture intelligence Pi, and the picture intelligence Pd of time migration is provided.Amount is determined by the second correction signal C2 when moving.Electron beam current correcting circuit 2 is gone back the picture intelligence Pd of time of reception skew, and control voltage Vc1, Vc2, Vc3 are provided.Electron amount (being called the electron beam current value from now on) at the intrafascicular per second of modulated combination electronics is determined by the 3rd correction signal C3.In described embodiment, the horizontal deflection electric current is influenced by the first correction signal C1 so that horizontal deflection speed is reduced at the edge that tends to display screen 10.Might produce the 4th correction signal is used to make vertical yoke current Iv to reduce at the edge that tends to display screen 10.By means of deflection is reduced, can reduce the minimizing of light quantity when tending to the edge of display screen 10.
The site error of the picture intelligence Pi that produces owing to the deflection speed that influences on the display screen 10 can be compensated by means of the second correction signal C2 by time correction circuit 3.
Might make when the edge of the trend display screen degree that slows down of deflection 5 reduce compared with light quantity when requiring to be reduced in the edge of trend display screen 10 that necessary to slow down degree bigger.But the final bigger light quantity mat that occurs is selected the shape of the 3rd correction signal C3 to reduce during (at the electron amount of the intrafascicular per second of composite electron of modulation) edge at trend display screen 10 so that beam electronic current in this wise and is compensated fully or partly.The electron beam flow valuve, for example, can be influenced by means of the contrast control that is suitable for this purpose: the picture intelligence Pd of time migration multiply by the 3rd correction signal C3.The control of this contrast can combine with ready-made contrast control in the image display apparatus, or can be used as extra characteristic and add.
Also might mat arrangement S corrective capacity Cs and line deflector coil Lh be in series, or the mat value of selecting S-corrective capacity Cs is littler than common, reduces when the edge of trend display screen so that realize deflection speed.In these cases, first correction signal can be save.In the circuit of knowing usually, the value of S-corrective capacity Cs is selected to like this, so that the voltage on the horizontal deflection coil Lh can be used to compensate too high deflection speed when trend shows the edge of shielding 10 in the possible mode of the best at the vertical edge and reducing of trend display screen 10.This too high deflection speed is owing to display screen 10 almost is that the plane occurs.In the present invention, S-corrective capacity value Cs is intentionally elected as less than for the necessary value of normal deflection, and horizontal deflection speed like this can reduce when the edge of trend display screen 10.In addition, produce the method for the field control signal that has very a large amount of S-corrections and field deflection speed is reduced when tending to the edge of display screen by means of the waveform generator that for example is contained in the deflection control circuit 50.From EP-A-0,567,301 know, horizontal deflection speed slows down when the edge of trend display screen, so that introduce given geometric distortion, thereby the degree of proofreading and correct is to determine on different bases.
Fig. 2 has shown some waveforms of the display operation that is used for key diagram 1.Shown one-period t0 at every turn, t1, it is corresponding to the leveled time of writing delegation on display screen 10 at interval.Dotted line on Fig. 2 a has shown the horizontal yoke current Ih0 according to prior art, and it has and is used for writing S-correcting value on the display screen 10 with (almost) constant level deflection speed.According to of the present invention owing to S-corrective capacity Cs intentionally selected very little have that too big S proofreaies and correct, then illustrate through the horizontal yoke current Ihc of overcorrect with block curve.Fig. 2 b has shown horizontal deflection rate Vh, and dotted line shows according to prior art, relevant with horizontal yoke current Ih0 constant horizontal deflection speed Vh0.Block curve has shown according to calibrated horizontal deflection speed Vhc1 of the present invention to be increased slightly in display screen 10 centers, and reduces when the edge of trend display screen 10.Fig. 2 c has shown with the constant electronic beam electronic current and has been radiated at light quantity in the delegation.Dashed curve 10 has shown the minimizing that appears at the edge time given frame position place, trend display screen 10 of display screen 10 according to prior art when the constant level deflection speed Vh0, and solid line lc1 shows the constant luminous quantity that occurs with the horizontal deflection speed Vhc that proofreaies and correct.Might make deflection speed slow down degree compared with for the compensation light the necessary degree that slows down of minimizing bigger, referring to the block curve Vhc2 of Fig. 2 b.In this case, can obtain tending to the increase of light quantity at the edge of display screen 10, shown in block curve lc2 among Fig. 2 c.The increase of this light quantity can be by reducing to tend to display screen 10 edges the method for electronic beam current proofread and correct.What certainly also may make deflection speed slows down degree compared with needed to slow down degree littler in order just in time to compensate the light quantity minimizing.Waveform shown in Figure 2 just provides with the form of giving an example, and in addition, for example the simple wave form of being made up of the line segment combination also is suitable for reducing the increase of luminous point.
Should be pointed out that foregoing embodiment just explanation rather than restriction the present invention, those skilled in the art can dream up the embodiment of many replacements, and not deviate from the scope of affiliated claim.Reference symbol between the parantheses in the claim should not be considered for and limit these claims.The present invention, and Waveform generating circuit 4, time correction circuit 3 and electron beam current correcting circuit 2 significantly can be with various different elements with example, in hardware, or realize with the integrated circuit form and/or by suitable programmed processor, and these realize all belonging to scope of the present invention.The present invention can be used to keep along continuous straight runs and/or light quantity vertically constant as much as possible.The picture tube that also is suitable for only using a branch of electron beam according to the reduction that light quantity is reduced of the present invention.
Claims (10)
1. the display screen (10) of an improvement picture tube (1) is gone up the method for brightness uniformity, this picture tube (1) also is furnished with control electrode (11,12,13), this method may further comprise the steps: drive (2) control electrode (11 in response to picture intelligence (Pi), 12,13) so that in picture tube (1), produce modulated electron beam, and make the modulated electron beam deflecting (5) and go up displayed image signal (Pi) at display screen (10), the ratio of width to height of picture intelligence (Pi) is corresponding with the ratio of width to height of display screen (10), it is characterized in that this method comprises another influence (C1; The step of Cs) deflection (5) is so that the deflection speed of modulated electron beam reduces towards the edge from the center of display screen (10).
2. as the method for the desired improvement brightness uniformity of claim 1, it is characterized in that this method comprises that another influence (3) picture intelligence (Pi) goes out now so that reduce the step of the site error of the picture intelligence (Pi) on display screen (10).
3. as the method for the desired improvement brightness uniformity of claim 1, it is characterized in that, deflection (5) follows with field direction to be carried out, and deflection (5) is that the deflection speed that follows direction is reduced and affected (C1 towards the edge from deflecting screen (10) center; Cs).
4. as the method for the desired improvement brightness uniformity of claim 3, it is characterized in that, follow direction deflection speed reduce relevant with the position of display screen (10) upper edge field direction.
5. as the method for the desired improvement brightness uniformity of claim 1, it is characterized in that, deflection speed from display screen (10) center towards the edge reduced overcompensation display screen (10) go up minimizing in its edge time output of trend, and this method comprises that another produces the step of the correction signal (C3) that can influence modulated electron beam (2), so that obtain the modulated electron beam through overcorrect, it comprises still less electronics than the electron beam per second of modulating from trend edge, the center of display screen (10) time.
6. display unit that is used for going up displayed image signal (Pi) at the display screen (10) of picture tube (1), this picture tube (1) is furnished with control electrode (11,12,13), and described display unit also comprises:
Drive unit (2) is used for drive controlling electrode (11,12,13) so that generation is in response to the electron beam of the modulation of picture intelligence (Pi) in picture tube (1), and
Arrangement for deflecting (5) is used for the electron beam that deflection was modulated, so that go up displayed image signal (Pi) at display screen (10), it is characterized in that display unit also comprises means for correcting (C1; Cs), be used to make the deflection speed of electron beam to reduce brightness uniformity in this wise towards the edge from display screen (10) center to be improved.
7. as the desired display unit of claim 6, it is characterized in that arrangement for deflecting (5) comprises line deflector coil (Lh) and means for correcting (C1; Cs) comprise S-corrective capacity (Cs), it is dressed up and line deflector coil (Lh) is in series, the value of S-corrective capacity (Cs) is littler than nominal value, so that the deflection speed of electron beam is reduced towards the edge from display screen (10) center, described nominal value and substantially invariable deflection speed are associated.
8. a display screen (10) that is used to improve picture tube (1) is gone up the correcting circuit of brightness uniformity, this correcting circuit comprises drive unit (2), be used for drive controlling electrode (11,12,13) so that the electron beam that generation was modulated in picture tube (1) in response to picture intelligence (Pi), it is characterized in that correcting circuit also comprises device (4), be used to make the deflection speed of electron beam to reduce brightness uniformity in this wise towards the edge from display screen (10) center to be improved.
9. the display screen (10) of an improvement picture tube (1) is gone up the method for brightness uniformity, this picture tube also is furnished with control electrode (11,12,13), this method may further comprise the steps: drive (2) control electrode (11,12,13) so that the electron beam that generation was modulated in picture tube (1) in response to picture intelligence (Pi), and follow with field direction and make the electron beam deflecting of modulating (5), so that go up displayed image signal (Pi) at display screen (10), it is characterized in that this method comprises another influence (C1; Cs) deflection (5) is so that the step that the deflection speed of electron beam reduces towards the edge from display screen (10) center, at least in this manner reduce to follow the deflection speed of direction, so that follow reducing and to be compensated basically of direction at least one frame position place light output.
10. the display screen (10) of an improvement picture tube (1) is gone up the method for brightness uniformity, this picture tube (1) also is furnished with control electrode (11,12,13), this method may further comprise the steps: drive (2) control electrode (11,12,13), and make the electron beam deflecting of modulate (5) so that response diagram picture signals (Pi) and in picture tube (1), produce the electron beam of modulation, so as on display screen (10) displayed image signal (Pi), it is characterized in that this method is further comprising the steps of:
Influence (C1; Cs) deflection (5), so that the deflection speed of electron beam reduces towards the edge from display screen (10) center, and
Going out now of influence (3) picture intelligence (Pi) is to reduce the site error on display screen (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96190467 CN1153585A (en) | 1995-05-09 | 1996-04-17 | Improvement of brightness uniformity on display screen |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP95201187.2 | 1995-05-09 | ||
| CN 96190467 CN1153585A (en) | 1995-05-09 | 1996-04-17 | Improvement of brightness uniformity on display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1153585A true CN1153585A (en) | 1997-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96190467 Pending CN1153585A (en) | 1995-05-09 | 1996-04-17 | Improvement of brightness uniformity on display screen |
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| Country | Link |
|---|---|
| CN (1) | CN1153585A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101965551B (en) * | 2008-03-05 | 2013-10-23 | 惠普开发有限公司 | Liquid crystal display uniformity |
-
1996
- 1996-04-17 CN CN 96190467 patent/CN1153585A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101965551B (en) * | 2008-03-05 | 2013-10-23 | 惠普开发有限公司 | Liquid crystal display uniformity |
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