CN1022452C

CN1022452C - Facility for screen correction in television

Info

Publication number: CN1022452C
Application number: CN 90107733
Authority: CN
Inventors: 冈特·格莱姆
Original assignee: Deutsche Thomson Brandt GmbH
Current assignee: Deutsche Thomson Brandt GmbH
Priority date: 1989-09-16
Filing date: 1990-09-15
Publication date: 1993-10-13
Anticipated expiration: 2005-09-15
Also published as: CN1050654A; DD295470A5; DE3931032A1; WO1992005670A1; TR25000A

Abstract

The present invention is a simple coorection device in a televison device. In order to evaluate and to correct deflection raster parameters, it is known to reproduce a grid pattern on the picture area (1). The invention in order to ensure an automatic evaluation and determination of the correction values of each parameter, a flat part (2) provided with photoelectric sensors (3) can be superimposed on the picture area (1). The total voltage (UH, UV) of the sensor rows is automatically set at maximal value by modifying each parameter. The device of the invention is particularly useful for correcting convergence in projection television sets having large projection surfaces.

Description

Facility for screen correction in television

The present invention is the television equipment screen correcting device.Here said television equipment is meant various devices those screen-types, that can reset electron image, and this device is by the TV broadcast signal or from such as the so another kind of eikongen picked up signal of video tape recorder, gamma camera and other image device.This device can be controlled by aerial signal, perhaps passes through CSCC signal, rgb signal with the form of monitor, is particularly controlled by luminance signal and color carrier wave.

A kind of like this simple and easy method, it mainly is the correction that is used for the deflecting screen parameter, as south/north, east/west face, the geometrical deviation of non-linear skew and other level and vertical direction, a convergence correction that special application field is exactly a TV projector of this simple and easy method, in this way multicolor image is projected on the image plane by three visual paths, and overlapping there, said convergence that Here it is.

In the equipment of convergence correction, mark is always come by a criss-cross vernier in the crosspoint of a GTG figure, and this vernier can move in level and vertical direction with manual mode.Then, by optical observation and the assessment to assembling in this cross-point region, convergence can armrest be moved and is transferred to maximum.The value in these crosspoints is just deposited in the memory.In the reformat image process, the convergence correction value in side by side single crosspoint, draw the convergence correction of necessity of three figure orthicons of each point, these three figure orthicons are independent of deflection current, and the convergence correction electric current of level and vertical convergence is fed back on the yoke assembly.

The convergence in all crosspoints adjusting is more time taking on the image screen, and the influence that shown by subjective meaning.The automatic adjusting of assembling is not easy to realize that this is because for the assessment of assembling, and the corresponding part in view image surface is necessary.

Purpose of the present invention is exactly to work out a kind of device of describing the screen correction of type, how to realize? just adopt a kind of like this method, promptly implement the assessment of corresponding parameter and determining of corresponding corrected value automatically.

The present invention is based on following imagination: the best convergence just means that the three-beam R.G.B that is focused at the image surface under the suitable situation of the strength ratio of chrominance signal, results from an informal voucher shape.On the other hand, the consistency of three strip R.G.B just means the high-high brightness that writes bar, because the brightness of three primary colors R.G.B adds up.In case the light beam R.G.B that is caused by inappropriate convergence shifts out bar-shaped zone.Not only the color of Zai Xianing is not white, and brightness has also weakened.The present invention has made full use of this true reverse side: by a transducer.The brightness of bar is measured automatically, and is transferred to maximum by changing convergence, and the brightness maximum of the bar that obtains must cause the convergence of three-beam R.G.B, because have only when three-beam R.G.B overlaps fully, could obtain high-high brightness.

These can be applied to other parameter of screen deviation equally about the thought of assembling.In other geometrical deviation, electron beam also departs from out from the track of regulation.Then, the brightness of being measured by transducer has also diminished, yet, the total brightness of being write screen that transducer is measured when being write screen and be in accurate, desirable position, simultaneously, the accumulation voltage that is discharged all reaches its maximum.Therefore, by this simple and easy method, total deviation is that the deviation of light beam on the regulation track just can be determined and be proofreaied and correct.

Because this invention, the manual adjustment of former necessary view image screen and convergence correction value can have been omitted now.Its result has saved a large amount of time, and on the other hand, the subjectivity influence in assembling assessment has also just been eliminated.Certainly, processor must carry out a large amount of computings, and wherein, three kinds of color R.G.B usually move on both direction, and the direction that brightness increases has been decided, and then, the drift of light beam is continuing up to obtaining high-high brightness always.Yet these operations can be carried out in a short period of time, and this time will shorten greatly compared with manual adjustment.

Another development of the present invention just provides the most of full figure image plane with various sizes, and this thing hangs over the front on image surface as an aperture plate.In this section, quantity corresponding to the GTG crosspoint, the logarithm of two line sensors all is fixed, and on the GTG bar on the cross-point region, all overlap, by automatic processor side by side, single logarithm of the row of transducer is just detected, and the convergence correction value in crosspoint has just been determined, and deposited in corresponding in the memory separately of each crosspoint.This automatic convergence correction method can be carried out on all image screens at short notice.This is particularly advantageous, because (for example) assembled and must often be adjusted repeatedly if position change or magnetic field environment change.

Next throw the example of the convergence of view apparatus with TV, this invention of accompanying drawings.

Fig. 1. the image surface of band GTG and foundation symbol indicating section of the present invention,

Fig. 2. assemble not enough bar,

Fig. 3. circuit block diagram of the present invention,

Fig. 4. according to the specific embodiment of this invention,

Fig. 5 is about the extension circuit block diagram of Fig. 3.

The image surface that the GTG of being made up of white target SH of level and vertical white target SV that Fig. 1 shows constitutes, it is to be manifested by three Color Channels that produce three primary colors R, G, B.Target SH, SV have the line of approximate width, and form crosspoint K, and its convergence value is determined respectively and stores.Regulate for the convergence of carrying out crosspoint K, a kind of like this method of planar section 2 usefulness places on the image plane 1, and the transducer that two capable two row that promptly are placed on the reverse side of part 2 are made by light-sensitive element overlaps with the ideal position of target SH and SV exactly.

In Fig. 2, SV has represented the width of the target that is apparent in image surface 1.Suppose that color G.B overlaps, promptly light beam G, B appear in one's mind exactly in shown among the width of target SV owing to assemble not enoughly, red light component has moved on to the left side, promptly has only a very little part to overlap in target SV.The brightness of the target SV that is made up of G, B and very little a part of R is decided by photodiode 3, produces voltage U H immediately.This voltage arrives processor, and processor moves light beam R, G, B according to the program that sets in advance on 4,5 directions, its objective is on photodiode, to be transferred to a maximum voltage, and simultaneously, also be the high-high brightness of target.If processor at first on direction 4 mobile beam R, will find that brightness reduces.Because now light beam R departs from target SV more, so processor just will stop the mobile of direction 4, and execution aspect 5 is mobile, thereby brightness has just increased.This moves and continues to move on direction 5 with lasting till, when brightness there will reduce once more.Can repeat similar program in appropriate circumstances by one, light beam R moves on direction 5, coincides with target SV exactly up to it, and has realized the convergence of R, and UH indicates by maximum.

Processor also will be attempted mobile bar G.Can find in an example shown,, will cause reducing of brightness, because light beam G always occupies the optimum position of convergence moving and moving on direction 5 on the direction 4.Therefore, the final result processor will not change the position of G.To B also is same.Yet processor all moves all three light beams in principle, always for all light beam R, G, B are transferred to by photodiode 3, i.e. and the high-high brightness determined of maximum UH.If obtained high-high brightness, this necessity also just means the best convergence of three-beam R, G, B.

One side of Fig. 3 has shown the part 2 that is positioned on the image surface 1.Placing two vertical row 6,7 that have photodiode 3 here.The row of being made up of 8 photodiodes 36 produces an accumulation voltage U H, and correspondingly, row 7 produces accumulation voltage U V.In fact, like this quantity of the photodiode in the delegation is very big (as 22).Voltage U H and UV arrive processor 8, produce the convergence correcting current through digital to analog converter 9 again by 14, this electric current is delivered to the horizontal convergence that is used for Essential colour R, G, three image channels of B 15,16,17 respectively and is proofreaied and correct line chart RH, GH, BH and vertical convergence correcting coil RV, GV, BV.Coil shown in the figure is the convergence coil, and these coils do not rely on the real deflecting coil of image channel 15,16,17, and has the inductance more much smaller than self deflecting coil.

In processor 8, according to the described method of Fig. 2, the corrected value in a crosspoint is decided and is deposited in the register 18 corresponding to each crosspoint, carries out this step successively corresponding to the crosspoint K of each GTG SH, SV.In the deflecting screen process of image reconstruction, be stored and the corrected value of continuous crosspoint K is accessed from memory 18 and offer correcting coil with the form of correcting current.

This simple and easy method is the vernier without the mark crosspoint of operating.Owing to this reason, at each in particular cases, this is determined by following method: the exposure in short-term under light always of the transducer of part 2 to be necessary in memory 8 to determine which crosspoint K by operator part 2 to be set for, just work as light beam and run in screen deflection in the transducer, the time for exposure point in screen deflection can be determined by register.For example, determine time for exposure point " row No.77, crosspoint No.3 ", just can determine the locus in the crosspoint of assessing in the image surface with the electricity assessment of this instantaneous position.This inquiry location is very important.Because the location between the crosspoint K on image surface 1 and the corrected value of determining for it must be carried out in processor 8 and memory 18.

What Fig. 4 showed is the simple and easy method that the crosspoint K that is determined by two target SH, SV is manually assessed, the part that the is assemblied in reverse side 2 usefulness handles 19 that are made of sensor row 6,7 place on the K of crosspoint, and its method is to make the row of transducer 6,7 corresponding to target SH, SV.Four marks the 30,31,32, the 33rd on the edge of part 2 are used to refer to the position of transducer 6,7 row, and part 2 is correctly placed on the image surface 1.The voltage U H and the UV that are provided by transducer 6,7 row on Fig. 3 guide on the processor 8 through line 22.

Part 2 also can design greatlyyer, and it is right to comprise the row of a large amount of transducer 6,7.According to the setting of part 2, these row are to sequentially being assessed by processor 8.Part 2 can have the size on total image surface 1, and can comprise the crosspoint K of all the sensors capable 6,7 on the image surface 1.In this case, regulate for the convergence in all crosspoints, only need once part to be placed before the image, handle 19 is attaching a manual operational unit 34.Thus, along with the accurate set of part 2 on image surface 1, definite process of described convergence checking process and corrected value just can have been started, and also can stop in the time of suitable.This is very favorable, and in office exactly what it makes crosspoint K accurately in the process of set along visual apparent motion, and part 2 does not begin to assess, and incorrect corrected value is not provided.Simultaneously, show that 35 place on the handle 19, it is controlled by processor 8, and indicates the definite and storage of corrected value to finish, and part 2 can be placed in another one crosspoint K.

Fig. 5 shows is actual detection circuit according to Fig. 3.Each crosspoint of GTG SH, SV K was assessed by part 2 in the selected time on the image surface 1, and switch 23 has been indicated determining of level and vertical convergence respectively, the transformational relation between inspection and the storage.Shown among the figure that 18a～18f6 register is used for the convergence corrected value of coil RH, RV, GH, GV, BH, BV.By the input and output of the memory of switch transition always corresponding to single crosspoint K, in the practical application, quantity is than being presented at here much bigger, the output switch S 1 of processor 8 has been indicated the corrected value separately of six coils, these six coils are determined successively the crosspoint, and are deposited in successively among memory 18a～18f.Entire circuit is started by the described method of time control circuit 24 usefulness with vertical frequent pulse V by the frequent pulse H of level.

For monitoring and the correction assembled, the present invention has been described.In general, it can be used for checking the ideal position of deflecting screen, and is used for determining and the corrected value of the correspondence of memory image surface single point.This invention also can be used for the TV that projection arrangement and the common color rendering that has an image channel such as simple black and white reproduce.Utilize this invention simultaneously, the manufacturer of common TV can eliminate pincushion distortion automatically, non-linear and similar parameter.

Also can constitute by the target SH of the single crosspoint K of mark, GTG figure that SV forms by the different charts that mark certain on image plane 1 causes image cell.For the adjusting of special parameter, the GTG of an intersection or the figure of only being made up of horizontal and vertical lines also can be suitable for.The sensor row of being made up of big quantity sensor 36,7 also can be replaced by an independent transducer, and then its output voltage is defined as UH, UV.See that in Fig. 2 a single-sensor of measuring target SV brightness can be used for screen is transferred to the maximum output voltage of single-sensor, thereby also is the high-high brightness of target that transducer shines.

Claims

1, measures the method for the corrected value of television airdrome deflection parameter, wherein shown the figure (SH, SV) of mark particular image unit on the image surface (1); Simultaneously, the determined corrected value of each image cell is deposited in respectively in the memory (18), wherein, correction value is positioned at the plane that part has optical sensor (3) on (2) and measures by being assemblied in image plane 1, its voltage is by rectification, and carry out correction value and measure, it is characterized in that each transducer is by the delegation (6 in several row in the optical sensor, 7) optical sensor of arranging mutually (3) constitutes, and (UH UV) depends on row (6 at optical sensor (3) to the optical sensor accumulated voltage, 7) the whole luminosity of impact light, it is a maximum, if this maximum depends on the known parameters on image plane (1), so, the image of describing the settle the standard planar section of length of the plane of delineation that singly coexists is just the same, like this, carries out the mensuration of correction value with the maximum of accumulated voltage.

2, according to the device of claim 1, it is characterized in that: a handle (19) and definite transducer (6 are arranged on the planar section (2), 7) mark of Hang position (30-33), planar section (2) can place with manual form on the image surface (1), its method is, in the zone of an image cell (K), transducer (6, the 7) row on the image surface (1) places on the figure (SH, SV) (Fig. 4).

3, according to the device of claim 1, it is characterized in that: planar section (2) has the size of whole projection surface (1), and it is right to be furnished with a large amount of transducer (6,7) row, and each is positioned image cell (K).

4, according to the device of claim 1, it is characterized in that: these transducers (6,7) row that are positioned the crosspoint to automatically, sequentially supply with memory (8) and determine the convergence corrected value.

5, according to the device of claim 1, it is characterized in that: processor (8) comprises the circuit of a definite image cell (K) in the locus, and this image cell is in image plane (1), in the deflecting screen process, in the time of exposure sensor, assess by transducer.

6, according to the one or more device among the claim 1-5, it is characterized in that: a line sensor (6,7) always can be replaced by a single transducer.

7, according to the device of claim 1, it is characterized in that: being positioned at part has a manual functional unit (34) on (2), and logical and disconnected by the switch on it can be assessed the accumulation voltage of sensor row, and determine corrected value.

8, according to the device of claim 7, it is characterized in that: being positioned on the part (2) has a display unit, and it can refer to whether determining of corrected value and storage are finished.