CN1319386C - CRT projection display apparatus and color correction method thereof - Google Patents
CRT projection display apparatus and color correction method thereof Download PDFInfo
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- CN1319386C CN1319386C CNB2004100826997A CN200410082699A CN1319386C CN 1319386 C CN1319386 C CN 1319386C CN B2004100826997 A CNB2004100826997 A CN B2004100826997A CN 200410082699 A CN200410082699 A CN 200410082699A CN 1319386 C CN1319386 C CN 1319386C
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Abstract
To provide a projection display device including a correction circuit for correcting color non-uniformity based on a difference of a projection angle of each primary color projection tube, in the projection display device using a plurality of primary color projection tubes. The projection display device that includes the plurality of projection tubes wherein primary color video signals are supplied to cathodes, and displays projection video images from the respective projection tubes on a screen, includes a separation section 43 for separating a synchronizing signal from an input video signal, a correcting signal generation circuit 11-16 that utilizes the synchronizing signal to generate a correcting signal for correcting color non-uniformity on the screen, control circuits 17, 18 for controlling the correcting signal in accordance with luminance levels of primary color video signals supplied to the projection tubes, and supply sections 19-24 each for supplying the controlled correcting signal to a first grid or a second grid of each projection tube, and corrects color non-uniformity of the plurality of projection tubes. (C)2005,JPO&NCIPI.
Description
Technical field
The present invention relates to the CRT type display device of a kind of use primary colors CRT (cathode ray tube), especially a kind of CRT type projection display apparatus, it is proofreaied and correct the uneven color that the different projectional angles owing to each CRT cause.
Background technology
Use the CRT type projection display apparatus of primary colors CRT (blue CRT, green CRT, red CRT) to be set to make its projectional angle different, and the CRT in those adjacent right sides and left side is with the predetermined angle setting with respect to central CRT.Consequently, the Luminance Distribution of each primary colour image on screen produced fine distinction, and this can cause uneven color when carrying out white full demonstration.
As the routine techniques (Japanese Unexamined Patent Publication No 3-151786) of compact disk equipment, example of cicada is wherein proofreaied and correct uneven color on a CRT type projection display apparatus.Here inhomogeneous color correction waveform and primary color video signal have been carried out multiple processing, and, eliminated uneven color by using a plurality of output signals to drive CRT.
This routine techniques is based on following understanding: promptly uneven color is caused by different projectional angles, should eliminate by method for electrically.In order to proofread and correct the problem of inhomogeneous color better, the technology in this document is not enough, must adopt more improved method to solve the problems referred to above.
Summary of the invention
The purpose of this invention is to provide a kind of CRT type projection display apparatus with a plurality of primary colors CRT, it can proofread and correct the caused uneven color of different projectional angles owing to each primary colors CRT better, and a kind of method that realizes this color correction is provided.
Of the present invention aspect first in, a kind of CRT type projection display apparatus with a plurality of primary colors CRT is provided, negative electrode feed-in primary color video signal at these CRT, be presented on the screen with projected image each CRT, comprise a separating part, it is separated synchronizing signal from incoming video signal; A correction signal generation circuit, it produces an inhomogeneous color correction signal by utilizing by the isolated synchronizing signal of separated part branch on screen; A control circuit, it controls described correction signal according to the brightness degree that offers the primary color video signal of CRT; And a feedthrough part, it will be fed to first grid or the second grid of each CRT by the correction signal that control circuit is controlled.
According to an aspect of the present invention, provide and comprised three CRT (52R, 52G, CRT type projection display apparatus 52B), the negative electrode of described CRT is by the feed-in primary color video signal, and show from described CRT and project to image on the screen, comprising: separating part (43), it isolates synchronizing signal from incoming video signal; Correction signal generator circuit (11 to 16), it produces correction signal by utilizing by the isolated synchronizing signal of described separating part, is used to proofread and correct the uneven color on the screen; Control circuit (17 to 18), (brightness degree of primary color video signal 52B) is controlled described correction signal for 52R, 52G to described CRT according to presenting for it; And feedthrough part (19 to 24), it will be fed to first grid or the second grid of each CRT by the correction signal that control circuit is controlled.
According to a further aspect of the invention, a kind of CRT type projection display apparatus is provided, red and blue CRT both sides, adjacent that has a green CRT and be arranged on this green CRT, described projection display apparatus is presented primary color video signal to each CRT, and will be presented at from the projected image of each CRT on the screen, comprise: separated in synchronization part (43), it isolates level and vertical synchronizing signal from incoming video signal; The first correction signal generator circuit (11,12), in order to proofread and correct the inhomogeneous color of level on the screen that causes by red and blue CRT, the described first correction signal generator circuit is configured to generate the first and second level correction signals of sawtooth waveform by utilizing and the synchronous signal of described horizontal-drive signal; The second correction signal generator circuit (15,16), in order to proofread and correct by the vertical inhomogeneous color on red and the screen that green CRT causes, the described second correction signal generator circuit is configured to generate and the described vertical synchronizing signal first vertical color correction signal synchronous, parabolic waveform, and in order to proofread and correct the vertical inhomogeneous color on the screen that causes by blue CRT, the described second correction signal generator circuit is configured to by the described first vertical color correction signal is carried out anti-phase, generates the second vertical color correction signal; First adder circuit (13), it is with the first vertical color correction signal and the first horizontal color correction signal plus; Second adder circuit (14), it is with the second vertical color correction signal and the second horizontal color correction signal plus; Control circuit (17), its basis is presented the output and the first vertical color correction signal of controlling first and second adder circuits to the brightness degree of the primary color video signal of each color CRT; Feedthrough part (19 to 24), output, the output of second adder circuit and the first grid or the second grid that the first vertical color correction signal is fed to corresponding CRT of the first adder circuit that it will be controlled by control circuit; And screened circuit (18), it is forbidden in vertical flyback at interval the output of first adder circuit, the output of second adder circuit and first grid or the second grid that the first vertical color correction signal is fed to each CRT.
According to a further aspect of the present invention, provide a kind of method that realizes CRT type projection display apparatus is carried out color correction, having comprised: primary color video signal has been fed to three CRT (52R, 52G, step 52B); By utilizing the synchronizing signal of from incoming video signal, separating to generate the step of correction signal, be used to proofread and correct uneven color on the screen; (brightness degree of primary color video signal 52B) is controlled the step of described correction signal for 52R, 52G to CRT according to presenting; The correction signal of being controlled is fed to the step of first grid or the second grid of each CRT.
Description of drawings
Fig. 1 shows the block diagram according to an actual color correcting circuit of CRT type projection display apparatus of the present invention;
Fig. 2 shows the block diagram according to another actual color correcting circuit of CRT type projection display apparatus of the present invention;
Fig. 3 shows the block diagram according to an example of CRT type projection display apparatus of the present invention;
Fig. 4 shows the block diagram according to an example of the structure of the deflection circuit of CRT type projection display apparatus of the present invention;
Fig. 5 A, 5B and 5C show the schematic diagram of example of the outward appearance of CRT type projection display apparatus;
Fig. 6 is used to explain according to the level on the CRT type projection display apparatus of the present invention and the schematic diagram of vertical color treatment for correcting;
Fig. 7 is the oscillogram that is used to explain the generative process of the inhomogeneous color correction signal of level according to the present invention;
Fig. 8 is the oscillogram that is used to explain according to the generative process of vertical inhomogeneous color correction signal of the present invention.
Embodiment
Now with reference to accompanying drawing a embodiment according to CRT type projection display apparatus of the present invention is described in more detail.
＜according to CRT type projection display apparatus of the present invention 〉
Fig. 1 shows the block diagram according to an actual color correcting circuit of CRT type projection display apparatus of the present invention.Fig. 2 shows the block diagram according to another actual color correcting circuit of CRT type projection display apparatus of the present invention.Fig. 3 shows the block diagram according to an integrally-built example of CRT type projection display apparatus of the present invention.Fig. 4 shows the block diagram according to an actual deflection circuit of CRT type projection display apparatus of the present invention.Fig. 5 is a schematic diagram of the apparatus in accordance with the present invention.
Although according to the feature of CRT type projection display apparatus 1 of the present invention is the even correcting circuit 48 of irregular colour that has shown in Fig. 1 or 2, followingly at first its overall structure is described with reference to Fig. 3.The configuration of Fig. 3 has a tuner pack 41, is used for receiving satellite broadcast, surface wave analog broadcasting, ground-wave digital broadcasting etc.; Also have a video amplifier part 42, be used for suitably amplifying video output from tuner pack 41; A primary colors output 44 is used to export based on the primary signal (R, G, B signal) from the output of video amplifier part 42; A CRT drive circuit 45 is used to receive from the primary colors output signal of primary colors output 44 and exports the CRT drive signal; And CRT 52R, 52G, 52B, its negative electrode feed-in is from the R of CRT drive circuit 45, G, B drive signal.
A separated in synchronization part 43 is connected to video amplifier part 42, with the synchronizing signal HP and the VP of extraction level and vertical synchronization.Be fed to level and vertical deflection circuit 46 and 47 from the level of separated in synchronization part 43 and vertical synchronizing signal HP and VP respectively from separated in synchronization part 43, so that level and vertical yoke current flow into CRT 52R, 52G, the deflecting coil 51 of 52B.
On the other hand, level and vertical synchronizing signal HP and VP are fed to the even correcting circuit 48 of an irregular colour from separated in synchronization part 43.An AFC (automatic frequency control) pulse A, and a voltage B (ABL voltage) who changes in response to luminance signal are fed to the even correcting circuit 48 of irregular colour from horizontal deflecting circuit 46.It should be noted that ABL voltage B also is fed to video amplifier part 42, to realize the effect of restriction brightness.
Here horizontal deflecting circuit 46 comprises a high-tension transformer, and high voltage is fed to CRT 52R, 52G, the anode of 52B, the even correcting circuit 48 of irregular colour is fed to CRT 52R with a red-correction signal RH, a blue-correction signal BH is fed to CRT52B, and a green correction signal GH is fed to CRT 52G.
With reference to figure 1, incite somebody to action explain color correcting circuit 48 in more detail below.In Fig. 1, the even correcting circuit 48 of irregular colour has integrator 11,12, presents horizontal-drive signal HP from separated in synchronization part 43 to described integrator 11,12; Also have adder 13,14, be used to receive the output of integrator 11,12; Integrator 15 is presented the vertical synchronizing signal VP from separated in synchronization part 43; An inverter circuit 16 is presented the output of integrator 15 to it; A voltage transitions part 17 is used to export the voltage (ABL voltage) according to the brightness degree variation of the primary color video signal of presenting from corresponding CRT; And a screened circuit 18, be used for shielding processing is carried out in the output of voltage transitions part 17.
It should be noted that the integrator 11,12 and 15 that available common CR circuit is realized also can use operational amplifier to realize.Preferably integrator 11,12 and 15 is configured to data circuit.In this case, if detecting on the vertical and horizontal direction of corresponding coordinate when any uneven color component on screen, having occurred, inhomogeneous color correction can suitably be finished by the corrected value based on digital value, to eliminate this uneven color component.
When adopting above-mentioned horizontal-drive signal HP and vertical synchronizing signal VP, as shown in Figure 2, correcting circuit 48 preferably utilizes an AFC pulse A from horizontal deflecting circuit 46 and vertical deflection circuit 47.In other words, the correcting circuit 48 among Fig. 2 has a horizontal timing pulse-generator circuit 31, presents AFC pulse A from horizontal deflecting circuit 46 to it.The output of pulse-generator circuit 31 is fed to integrator 11 and 12.Horizontal timing pulse-generator circuit 31 for example is made of a monostable multi-frequency generator, and produces a commutator pulse that is used for the horizontal color correction signal of red and blue CRT.In addition, by being used to the vertically parabolic signal PP that is used for dynamic focusing from vertical deflection circuit 47, can obtain a parabolic signal PP who is used for vertical cycle, and need not to provide the integrator 15 shown in Fig. 1, and this signal is fed to inverter circuit 16, adder 13 and 14 and multiplier 21.Identical among the remainder of correcting circuit and Fig. 1, therefore omitted further explanation to it.
Here, the configuration of open fire flat deflection circuit 46 and vertical deflection circuit 47 below with reference to Fig. 4.In Fig. 4, horizontal deflecting circuit 46 has a horizontal drive circuit 61, presents from the horizontal-drive signal HP of separated in synchronization part 43 outputs to it; Also have a horizontal output circuit 62, present output from horizontal drive circuit 61 to it; And high-tension transformer (FBT) 63 that is connected to horizontal output circuit 62.The output of high-tension transformer 63 is sent to a focus pack 64, and it is fed to the focusing electrode of corresponding CRT.The high pressure output of high-tension transformer 63 is fed to the anode of corresponding CRT.
In addition, a predetermined winding from high-tension transformer 63 obtains a horizontal AFC electric pulse A.The output of horizontal output circuit 62 is connected to the horizontal deflection coil of deflection yoke 51.In actual form shown in Figure 2, horizontal AFC electric pulse A is fed to the even correcting circuit 48 of irregular colour.The correcting circuit 65 of a S shape is connected to the horizontal deflection coil of deflection yoke 51.S-correction circuit 65 comprises a unshowned capacitor, is used to carry out S-correction, and generates the parabolic waveform of a horizontal cycle at S-correction capacitor two ends.Therefore, utilize the signal of this parabola wave as horizontal dynamic focusing.
On the other hand, vertical deflection circuit 47 comprises that a vertical deflection/DPC proofreaies and correct control IC 71, presents from the vertical synchronizing signal VP of separated in synchronization part 43 outputs to it; Also comprise a DPC circuit 72, present the output of proofreading and correct control IC 71 to it; A vertical dynamic focus output 74 is presented vertical dynamic focus parabolic signal PP to it; And a vertical-deflection output circuit 73, present the output of proofreading and correct control IC 71 to it.The output of vertical-deflection output circuit 73 is fed to the frame deflector coil of deflection yoke 51.It should be noted that DPC represents the right side/left pincushion type distortion correction.
The outward appearance that CRT type projection display apparatus 1 according to the present invention has shown in Fig. 5 A, 5B and 5C.Fig. 5 A is expressed as the positive vertical view of display part with screen S; Fig. 5 B is a front view, and in the middle of wherein green CRT 52G was positioned at, red and blue CRT 52R was predetermined angle with 52B and green CRT and arranges; Fig. 5 C is the end view of screen S.
(operation)
So basic operation of the CRT type projection display apparatus of structure will be described at first, below.At first, the vision signal channel of selecting at tuner pack 41 places is sent to primary colors output 44 then being sent to video amplifier part 42 through after the demodulation, obtains primary colors (R, G, B signal) there.Each primary signal R, G, B is sent to CRT 52R by CRT drive circuit 45,52G, the negative electrode of 52B.From CRT 52R, 52G, light beam imaging on screen S that 52B penetrates, and be shown as piece image.It should be noted that described vision signal not only can be come the vision signal of the broadcast singal of comfortable tuner pack 41 places reception, also can be from outside source, as the vision signal of VTR.
In addition, separated in synchronization part 43 is separated/extracted level and vertical synchronizing signal HP and VP in the vision signal of video amplifier part 42 always, and offer level and vertical deflection circuit 46 and 47, can make deflection current flow into the level and the frame deflector coil of deflection yoke 51 by these signals of described deflection circuit.In addition, horizontal-drive signal HP or horizontal AFC electric pulse A are sent to the even correcting circuit 48 of irregular colour from horizontal deflecting circuit 46, and vertical synchronizing signal VP or vertical dynamic focus parabolic waveform PP are sent to the even correcting circuit 48 of irregular colour.The ABL signal also is sent to correcting circuit 48.
(irregular colour is spared treatment for correcting)
Here, will utilize the sequential chart of Fig. 6 to 8 and the operation that schematic diagram illustrates the even correcting circuit 48 of irregular colour below.In CRT type projection display apparatus 1 according to the present invention, because the caused uneven color of different projectional angles is proofreaied and correct by the even correcting circuit 48 of irregular colour among a plurality of CRT.The color correction signal of this processing by being produced based on the level in the actual form shown in Figure 1 and vertical synchronizing signal HP and VP, and finish by the color correction signal that is produced based on the horizontal AFC electric pulse A in the actual form shown in Figure 2 and vertical dynamic focus parabolic signal PP.
For example, suppose on screen S, to have occurred as shown in Figure 6 uneven color region.In this example, lack green and redness, lack redness, lack blueness in the left side of screen on the screen right side in the top and the bottom of screen.
In this case, in order to proofread and correct uneven color region as shown in Figure 6,, horizontal-drive signal HP is delivered to integrator 11 and 12 by using correcting circuit 48.By for each integrator is provided with the reasonable time constant, can obtain to be similar to the correction signal C1 of sawtooth waveform based on horizontal-drive signal HP, C2 (referring to Fig. 6).Correction signal C1 is corresponding to the horizontal color correction signal that is used for blue CRT 52B, and correction signal C2 is corresponding to the correction signal that is used for red CRT 52R.Described correction signal C1, C2 have strengthened blueness and red shortage the in screen S left side and the right side area.
In addition, vertical synchronizing signal VP is sent to integrator 15, and as the result of integration, with vertical synchronizing signal VP synchronously in obtained a parabolic waveform C4, on the other hand, parabolic waveform C4 is undertaken anti-phase by inverter circuit 16, obtained a parabolic waveform C3.Correction signal C3 is the vertical color correction signal that is used for blue CRT 52B, and correction signal C4 is the vertical color correction signal that is used for green and red CRT 52G and 52R on the other hand.Correction signal C4 is used to strengthen the green and red shortage of screen S top and bottom, and correction signal C3 is used to reduce the blue component of screen S top and bottom, to proofread and correct, obtains unified on the whole blueness, redness and green.
Horizontal color correction signal C2 and vertical color correction signal C4 addition in adder 13, horizontal color correction signal C1 and vertical color correction signal C3 addition in adder 14.Multiplier 19 and 20 are delivered in adder 13 and 14 output respectively, and vertical color correction signal C4 is sent to multiplier 21.The color correction signal is delivered to the gate electrode G1 of redness, blueness and green CRT 52R, 52B and 52G from these multipliers 19,20 and 21 respectively via amplifier 22,23 and 24, makes that level and vertical inhomogeneous color obtain proofreading and correct.
By determine the time constant of integrator 11,12 and 15 according to the degree of inhomogeneous color in the above-mentioned treatment for correcting, can realize desirable color grade correction, the exponent number of integration is set to suitable grade simultaneously.
On the other hand, the voltage (ABL voltage) that changes according to the change of luminance signal grade is fed to multiplier 19,20 and 21 from voltage transitions part 17, to control the degree of color correction according to the brightness of screen.In other words, in the black signal input time, screen is shown as black on the whole, and when inhomogeneous color correction signal was applied on the gate electrode G1, the luminous of phosphor can not be interrupted equably, makes producing uneven color in black part.For fear of the problems referred to above, control, make that the electromotive force on the gate electrode G1 is set to 0V under the lower situation of brightness degree, and higher and under the situation of complete bright picture screen at brightness degree, inhomogeneous color correction signal is delivered to gate electrode G1.
In addition, a vertical blanking pulse VBLK is sent to screened circuit 18, does not carry out inhomogeneous color correction in retrace interval, to avoid the increase of brightness degree in vertical flyback at interval.
Fig. 7 and 8 shows the operation waveform that is used to generate above-mentioned correction signal C1, C2 and C3.Fig. 7 show in the circuit arrangement as shown in Figure 2 horizontal AFC electric pulse A and from the commutator pulse T of horizontal timing pulse-generator circuit 31.Horizontal timing pulse-generator circuit 31 for example uses the monostable multi-frequency generator, and can obtain commutator pulse T (pulse of drawing with solid line and dotted line).Obtain correction signal C1 by carrying out integration, obtain correction signal C2 by carrying out integration by 11 couples of commutator pulse T of integrator (dotted line) by 12 couples of commutator pulse T of integrator (solid line).
Fig. 8 shows an operation waveform of the integrator 15 shown in Fig. 1, and vertical synchronizing signal VP is integrated once to obtain a sawtooth waveform, is integrated twice to obtain a parabolic waveform of vertical cycle.It should be noted that the parabolic waveform of vertical cycle also can be used as vertical dynamic focus parabolic signal PP, can save integrator 15 as shown in Figure 2 in this case.
Therefore according to the embodiment of Fig. 1 and 2, employed signal can obtain desirable color correction signal in horizontal deflecting circuit 46 and vertical deflection circuit 47 by utilizing.
Color correction process not necessarily needs to carry out on level and vertical component simultaneously, also can only proofread and correct on horizontal component effectively.Perhaps can only on vertical component, carry out treatment for correcting.
In the present invention, inhomogeneous color correction signal is not applied on the vision signal, but is sent to gate electrode G1 (or gate electrode G2), to proofread and correct.Therefore can in the high-frequency region the unfavorable effect that may produce picture quality owing to increased inhomogeneous color correction circuit 48 be reduced to minimum degree arbitrarily like this.
Those skilled in the art can be based on different embodiment by independent employing or make up and realize the present invention.The present invention can use in the broad range of any known principle, and can be applicable to the invention described above embodiment in have in the different field of the feature of novelty, and should not be limited only the foregoing description.
Claims (13)
1. comprise three CRT (52R, 52G, CRT type projection display apparatus 52B), the negative electrode of described CRT be by the feed-in primary color video signal, and show from described CRT and project to image on the screen, it is characterized in that comprising:
Separating part (43), it isolates synchronizing signal from incoming video signal;
Correction signal generator circuit (11 to 16), it produces correction signal by utilizing by the isolated synchronizing signal of described separating part, is used to proofread and correct the uneven color on the screen;
Control circuit (17 to 18), (brightness degree of primary color video signal 52B) is controlled described correction signal for 52R, 52G to described CRT according to presenting for it; And
Feedthrough part (19 to 24), it will be fed to first grid or the second grid of each CRT by the correction signal that control circuit is controlled.
2. CRT type projection display apparatus as claimed in claim 1, it is characterized in that, it is middle that described three CRT are set to make a green CRT (52G) to be positioned at, and adjacent red CRT (52R) and blue CRT (52B) are the setting that concerns of symmetry with respect to the green CRT of centre.
3. CRT type projection display apparatus as claimed in claim 1 is characterized in that, a screened circuit is provided, to forbid in vertical flyback at interval correction signal being fed to first grid or the second grid of CRT.
4. CRT type projection display apparatus as claimed in claim 1 is characterized in that, the correction signal generator circuit is based on generating a horizontal color correction signal that is used for red and blue CRT from the isolated horizontal-drive signal of incoming video signal.
5. CRT type projection display apparatus as claimed in claim 1, it is characterized in that, the correction signal generator circuit has integrating circuit, the synchronous signal of described integrating circuit pair and horizontal-drive signal carries out integration with each different time constant, and generates a horizontal color correction signal and a horizontal color correction signal that is used for blue CRT that is used for red CRT.
6. CRT type projection display apparatus as claimed in claim 1 is characterized in that, the correction signal generator circuit generates the level correction signal that is used for red and blue CRT based on a horizontal AFC electric pulse.
7. CRT type projection display apparatus as claimed in claim 1, it is characterized in that, the correction signal generator circuit is based on generating the vertical color correction signal that is used for red and green CRT from the isolated vertical synchronizing signal of incoming video signal, anti-phase by the phase place of described vertical color correction signal is carried out, generate a vertical color correction signal that is used for blue CRT.
8. CRT type projection display apparatus as claimed in claim 7, it is characterized in that, the correction signal generator circuit has an integrating circuit, this integrating circuit carries out integration to one with the synchronous signal of vertical synchronizing signal, the vertical color correction signal that is used for red and green CRT with generation, also have a negative circuit, this negative circuit will be carried out anti-phase from the vertical color correction signal of described integrating circuit, to generate a vertical color correction signal that is used for blue CRT.
9. CRT type projection display apparatus as claimed in claim 7, it is characterized in that, the correction signal generator circuit generates the vertical color correction signal that is used for red and green CRT by using the vertical dynamic focus signals that is produced by vertical synchronizing signal, and by described vertical dynamic focus signals being carried out the vertical color correction signal that one of anti-phase generation is used for blue CRT.
10. CRT type projection display apparatus, red and blue CRT both sides, adjacent that has a green CRT and be arranged on this green CRT, described projection display apparatus is presented primary color video signal to each CRT, and will be presented on the screen from the projected image of each CRT, it is characterized in that comprising:
Separated in synchronization part (43), it isolates level and vertical synchronizing signal from incoming video signal;
The first correction signal generator circuit (11,12), in order to proofread and correct the inhomogeneous color of level on the screen that causes by red and blue CRT, the described first correction signal generator circuit is configured to generate the first and second level correction signals of sawtooth waveform by utilizing and the synchronous signal of described horizontal-drive signal;
The second correction signal generator circuit (15,16), in order to proofread and correct by the vertical inhomogeneous color on red and the screen that green CRT causes, the described second correction signal generator circuit is configured to generate and the described vertical synchronizing signal first vertical color correction signal synchronous, parabolic waveform, and in order to proofread and correct the vertical inhomogeneous color on the screen that causes by blue CRT, the described second correction signal generator circuit is configured to by the described first vertical color correction signal is carried out anti-phase, generates the second vertical color correction signal;
First adder circuit (13), it is with the first vertical color correction signal and the first horizontal color correction signal plus;
Second adder circuit (14), it is with the second vertical color correction signal and the second horizontal color correction signal plus;
Control circuit (17), its basis is presented the output and the first vertical color correction signal of controlling first and second adder circuits to the brightness degree of the primary color video signal of each color CRT;
Feedthrough part (19 to 24), output, the output of second adder circuit (14) and the first grid or the second grid that the first vertical color correction signal is fed to corresponding CRT of the first adder circuit (13) that it will be controlled by control circuit; And
Screened circuit (18), it is forbidden in vertical flyback at interval the output of first adder circuit (13), the output of second adder circuit (14) and first grid or the second grid that the first vertical color correction signal is fed to each CRT.
11. a realization is carried out the method for color correction to CRT type projection display apparatus, it is characterized in that comprising:
Primary color video signal is fed to three CRT (52R, 52G, step 52B);
By utilizing the synchronizing signal of from incoming video signal, separating to generate the step of correction signal, be used to proofread and correct uneven color on the screen;
(brightness degree of primary color video signal 52B) is controlled the step of described correction signal for 52R, 52G to CRT according to presenting;
The correction signal of being controlled is fed to the step of first grid or the second grid of each CRT.
12. method as claimed in claim 11 is characterized in that, it is middle that described three CRT are set to make a green CRT (52G) to be positioned at, and adjacent red CRT (52R) and blue CRT (52B) are symmetrical arranged with respect to described green CRT (52G).
13. method as claimed in claim 11 is characterized in that, forbids correction signal is fed to first grid or the second grid of each CRT in vertical flyback at interval.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003352413A JP2005117560A (en) | 2003-10-10 | 2003-10-10 | Projection display device and color correcting method for projection display device |
| JP352413/2003 | 2003-10-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1606361A CN1606361A (en) | 2005-04-13 |
| CN1319386C true CN1319386C (en) | 2007-05-30 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100826997A Expired - Fee Related CN1319386C (en) | 2003-10-10 | 2004-09-27 | CRT projection display apparatus and color correction method thereof |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2005117560A (en) |
| CN (1) | CN1319386C (en) |
| SG (1) | SG111204A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0932310A2 (en) * | 1998-01-21 | 1999-07-28 | Deutsche Thomson-Brandt Gmbh | Device for convergence correction in a television receiver |
| WO2002093941A1 (en) * | 2001-05-16 | 2002-11-21 | Sony Corporation | Restration adjuser and registration adjusting method |
| CN1394446A (en) * | 2000-11-09 | 2003-01-29 | 康宁精密镜片股份有限公司 | Lens systems for projection televisions |
-
2003
- 2003-10-10 JP JP2003352413A patent/JP2005117560A/en active Pending
-
2004
- 2004-09-21 SG SG200405545A patent/SG111204A1/en unknown
- 2004-09-27 CN CNB2004100826997A patent/CN1319386C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0932310A2 (en) * | 1998-01-21 | 1999-07-28 | Deutsche Thomson-Brandt Gmbh | Device for convergence correction in a television receiver |
| CN1394446A (en) * | 2000-11-09 | 2003-01-29 | 康宁精密镜片股份有限公司 | Lens systems for projection televisions |
| WO2002093941A1 (en) * | 2001-05-16 | 2002-11-21 | Sony Corporation | Restration adjuser and registration adjusting method |
Also Published As
| Publication number | Publication date |
|---|---|
| SG111204A1 (en) | 2005-05-30 |
| JP2005117560A (en) | 2005-04-28 |
| CN1606361A (en) | 2005-04-13 |
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