CN1051653A

CN1051653A - Be used for the deflecting screen on the picture plane is carried out self-adjusting device

Info

Publication number: CN1051653A
Application number: CN 90108833
Authority: CN
Inventors: 古恩特·格雷姆; 杰克斯·考文
Original assignee: Deutsche Thomson Brandt GmbH
Current assignee: Deutsche Thomson Brandt GmbH
Priority date: 1989-11-04
Filing date: 1990-11-02
Publication date: 1991-05-22
Also published as: WO1991007048A2; AU6548390A; DE3936790A1; WO1991007048A3

Abstract

The present invention is for to carry out self-adjusting equipment to the deflecting screen on the picture plane.On picture plane (1), be provided with an optical sensor that light beam covered (3) that is deflected screen.The present invention is intended to set up a kind of simple but can detect the sensor unit (3) of the deviation of light beam (L) on all directions.This sensor unit (3) comprises four transducers (A to D) of being arranged to the separation of a four-quadrant detector.The various combination that is undertaken by the input signal to transducer (A to D) can obtain being used to adjust the level of light beam and the control signal of vertical deflection.The present invention specifically is used in freeze-frame position and deflection amplitude in the projection television apparatus.

Description

Be used for the deflecting screen on the picture plane is carried out self-adjusting device

The present invention relates to a kind of being used for carries out self-adjusting device to the deflecting screen on the picture plane.

The present invention mainly enables in fill grid with grid (screen) type and set up the occasion of image on a picture plane.Best use occasion is that the sort of three monochrome images that sent by three figure orthicons project on the picture plane and in that superimposed television projection and establish.Here television equipment is meant and carries out any equipment that electron image reappears.The signal of sending into can be a television broadcasting signal or from the vision signal of other video source such as video tape recorder, gamma camera or other video equipment, and its form can be aerial signal, CSCC signal, rgb signal or be separated into luminance signal and the signal of colour subcarrier.

In TV projection equipment, the image that is produced by three figure orthicon R that separate, G, B projects on the picture plane, is overlapped into a width of cloth chromatic image.Like this, just be necessary that some parameter of screen deflection on the freeze-frame face for example projects image quiet straight position and the deflection amplitude in the horizontal and vertical directions on the image region.Stable can the realization by the optical sensor that light beam covered by producing according to the pulse that specially forms in the screen that is arranged on the picture plane named in above-mentioned being adjusted to.These transducers can be controlled each parameter, make that above-mentioned light beam spot is the central authorities that are positioned at the optical sensor on the picture plane.

The objective of the invention is to set up a kind of simple optical sensor unit, this unit can detect the light beam that impinges upon on the picture plane in the deviation on all directions and between the precalculated position.

In the present invention, four independently optical sensor be arranged to a preferably foursquare four-quadrant detector, thereby can detect light beam on all directions with the deviation in precalculated position.This is because any deviation in the coordinate system of being determined by transducer all can be determined by sensor output signal.By signal of sensor is carried out different combined crosswise, can be indicated the correction for drift variable on horizontal direction and the vertical direction simultaneously.Use these correcting variables, deflecting screen (being its static position and deflection amplitude in image region specifically) can be readjusted.The present invention is particularly suitable for proofreading and correct because of variations in temperature or the aging deflecting screen deviation that causes.Use of the present invention is not limited to projection TV, and the present invention can make a deflecting screen in the image region stable by holding various deflection parameter bundles in wider scope.

Explain the present invention below with reference to the accompanying drawings.In the accompanying drawing,

Fig. 1. be the image region that has an optical sensor in principle,

Fig. 2. be the allocation plan that is used to stablize the sensor unit of each deflection parameter.

Fig. 3. be circuit block diagram.

Fig. 4. be further treatment circuit to the control signal of sensor unit generation.

Fig. 5. be the expanded circuit block diagram of in the TV device for projecting, assembling adjustment.

Fig. 1 shows an image region 1, reflects the TV image that has to have a cell structure 2 that is made of many horizontal and vertical lines in this zone.The effect of cell structure 2 is appraisal and the corrected value of determining convergence and deflection parameter.An optical detecting unit 3 is arranged on the outside or the inside of image region 1, and it is shone by the same light beam that writes out image in deflecting screen within the predetermined time.Like this, sensor unit 3 will produce a signal, and this signal is delivered to an appraisal circuit 5 that makes each deflection parameter stability by amplifier 4.

Fig. 2 shows those deflection parameters that usefulness optical sensor 3 can be stable.The image in the horizontal direction with vertical direction on the position can stablize by optical sensor 3a, optical sensor 3a is positioned at the outside and the central authorities of image region 1 in vertical direction, shown in the infall of coordinate K.Vertical deflection amplitude V can be stablized by two transducer 3b, 3c being positioned at upper and lower two edges of image, and two light beams that the marker on some row during the elimination produces will shine (adjustment) on these two transducer 3b, 3c.Horizontal deflection amplitude can be stablized by two transducer 3a and 3d, and index pulse will be superimposed upon the initial sum end of delegation and several row outside the visible image zone.Also can be four

such transducer

3b, 3c, 3e and 3f are arranged on each angle of image region 1.Adopted after such device, the static position of deflecting screen and deflection amplitude not only can be stablized in the horizontal direction but also in vertical direction.

Sensor unit 3 among Fig. 3 separates and constitutes the sensors A of a four-quadrant detector on electric by four, B, and C, D forms.Sensors A, B and C, D are close to mutually in the horizontal direction, and sensors A D and BC then overlap in vertical direction.Light beam L is radiated on the origin of coordinate that center precalculated position is four transducers.Four sensors A are to the output signal U A of D, and UB, UC and UD be respectively by amplifier 4a, 4b, and 4c and 4d deliver to summing

stage

6,7,8,9, send horizontal deflection control signal UH and vertical deflection control signal UV by them by two

subtraction stage

10 and 11 again.According to Fig. 3, the value of these two control signals adds following formula and represents:

UH＝（UA+UD）-（UB+UC）

UV＝（UA+UB）-（UC+UD）

When light beam L was positioned at the precalculated position, sensors A to all input signals of D were same amplitude, therefore, and UH=0, UV=0.

If light beam moves to+H direction in the horizontal direction, then signal UA and UD diminish, and UB and UC become big.At this moment, correcting variable UH will become negative value, and it can (by adjusting) eliminate light beam L deviation in the horizontal direction.Corresponding therewith, light beam L on-H direction when mobile UH will become on the occasion of.Light beam L to+when the V direction moves, signal UC and UD will correspondingly diminish, and UA and UB will become greatly, like this, UV will become on the occasion of, it can eliminate the deviation on the vertical direction.Equally, light beam L-when the V direction moves, correcting variable UV will become negative value.Like this, light beam L can be readjusted with respect to the deviation of sensor unit 3 on all directions.

The further measure that the control signal of sensor unit 3 generations is estimated has been shown among Fig. 4.The horizontal deflection and the screen deflected beam that impinge upon on the sensor unit 3 have definite constant dimensions on vertical direction V.Like this, the vertical direction V control signal point of generation is to indicate light beam position on sensor unit on the V direction.Above-mentioned control signal is zero when light beam is positioned at the center Z of sensor unit 3, when light beam to+increase to positive direction when the V direction moves, when light beam to-then increase when the V direction moves to negative direction.

When the cross section is roughly the light beam covering sensor unit of point-like, there is not prerequisite in the horizontal direction.Even light beam is to be produced by very short control impuls in the figure orthicon, light beam L also scans according to line in the horizontal direction at impulse duration (during being shinny) and finishes a motion on the H.Therefore, light beam is hitting a plurality of sensor points with time sequencing on the H during its light in the horizontal direction, and the result will produce the control signal of a transient change during light beam L is shinny, and its instantaneous value depends on the point of irradiation of light beam L on sensor unit 3.

In Fig. 4 b, suppose that the light beam L of H upper deflecting has preposition on the H direction in the horizontal direction.Light beam is glittering in the diagram period T 1 with respect to the mid point Z symmetry of sensor unit.Along hitting each sensor points, this will produce a voltage U 1 that adds the transient change shown in Fig. 4 b to light beam L during T1.This voltage is admitted to a RC module, and output 21 places of this module can obtain the mean value U1m of this voltage U 1.When light beam be in the precalculated position time, this mean value is zero.Consequently do not obtain the correction voltage of correction deflector screen position in the horizontal direction.

When deviation takes place with respect to the position of sensor unit 3 in light beam L.The time degree is constant during light beam glittering.Yet, this glittering moved on to T2 among Fig. 4 a with respect to mid point Z during.During glittering, most of on the left side of light beam L has only fraction on the right.This can produce one and add the voltage U 2 shown in Fig. 4 C.Now, the average voltage U2m that obtains by RC module 20 no longer is zero, but on the occasion of.The voltage U 2m that obtains at the output 21 of RC module 20 is the correction voltage that depends on the skew between T1 and T2.This will make the deflecting screen that writes be shifted, and make light beam L occupy symmetric position according to T1 again with respect to sensor unit 3.Like this, the deflecting screen that writes has also been got back to its precalculated position.

The above the sensor unit that uses in TV projection equipment has been shown among Fig. 5 has entered the convergence correction that writes image and the operating position of position correction.Below, explain the function of Fig. 5 one by one.

Convergence correction

The convergence correction value of reflecting the crosspoint P in the cell structure 2 on image region 1 is stored among the memory M1 to M6.All horizontal convergence corrected values that wherein comprise figure orthicon R among the memory M1 correspondingly have all vertical convergence corrected values of figure orthicon R among the memory M2, analogize therewith.When on image region 1, writing image, the corresponding correction value of each crosspoint P is read from memory successively, and deliver to corresponding correcting coil through summing stage 12 and D/A 13, and during at every turn through a crosspoint P, the position of the switch during all switch S 1 all are among the figure.The actual quantity of the position of the switch is much larger than shown in the figure those, and it is corresponding with the P that counts of crosspoint P.Switch S 1 is determined according to the concrete physical location of light beam in screen by control circuit St.

Determining and input of convergence correction value

Each crosspoint P has and is total up to 6 corresponding to 6 correcting coil RH, RV, GH, GV, the corrected value of BH and BV is when determining the corrected value of a crosspoint P, this crosspoint P is covered by an adjustable cursor certainly, and then crosspoint P by manual observation assembles adjustment.Judge each corrected value that obtains by microprocessor 14 again, and deliver to switch S 3.Each corrected value of a crosspoint P is always sequentially determined, and is sequentially sent in time in the memory space of setting for this crosspoint among the memory M1 to M6 by switch S 3.Concrete stored position is preestablished by switch S 2, and all switch S 2 all are arranged on the constant position when six corrected values of a some P of storage.Therefore, the number of contacts of switch S 1 and S2 equals the sum in (perhaps being equivalent to) crosspoint.Have only and when the convergence that is provided with being carried out adjusting the first time or readjust, just carry out above-described operating process.

The freeze-frame position

The sensor unit 3 that is arranged on the picture plane 1 can play stable effect of reflecting the position of the map on image region 1.Control circuit St is handled by order wire C by processor 14, produces the RGB control signal of cell structure 2.In addition, St also is figure orthicon R, produces short pulse in G, B fix time in deflecting screen really.Each light beam that produces during (for example) elimination on the scene will be beaten on sensor unit 3 thus.Three figure orthicon R, G, B carry out in time successively.Sensor unit 3 will resemble shown in Fig. 1 and Fig. 3 produce the error signal of the deviation on indication horizontal direction and the vertical direction.These error signals are through amplifier 4 and estimate circuit 5 arrival processors 14.Processor 14 will produce control signal UH or UA for each color, and the corresponding correcting current that these signals produce in deflection unit will be adjusted the position that writes image on deflecting screen that is the picture plane 1.

Image position correction

Control signal UH, UV is admitted to each corresponding signal path RH in time successively through the switch S of being controlled by processor 14 4, RV, GH, GV is among BH and the BV.The always very short digital controlled signal of time of occurrence arrives holding circuit 15a to 15f respectively, and these holding circuits are the memory that is permanently stored in these control signals.Above-mentioned control signal in summing stage 12a to 12f with respectively from the corrected value addition of a plurality of switch S 1, therefore, they are except carrying out the above-mentioned convergence correction, can also deflecting screen that be write image be moved in the horizontal and vertical directions by D/A 13a to 13f and correcting coil, make that being write image is to occupy its precalculated position with respect to 1 of image region.Therefore, there is shown those correcting coils and can not only carry out proofreading and correct, can also make the position steady stability of image because of the different dynamic convergence in each crosspoint.Fig. 5 can also be stablized vertical deflection amplitude and horizontal deflection amplitude among Fig. 2.

Claims

1, a kind of being used for carried out self-adjusting equipment to the deflecting screen on the picture plane, wherein optical sensor unit (3) are arranged on the above-mentioned picture plane, and be subjected to screen light beam (L) irradiation and provide level and vertical deflection control signal (UH UV), is characterized in that:

Above-mentioned optical sensor unit (3) includes four transducers (A to D) of being arranged to the separation of a four-quadrant detector, and (UH, UV) various combination by the output signal (UA to UD) of the sensor (A to D) obtains above-mentioned control signal.

2, according to the equipment of claim 1, it is characterized in that: the control voltage (UH) of horizontal deflection (H) obtains by the voltage that makes the transducer (A, D and BoC) that overlaps each other on the vertical direction together and coordinate (11).

3, according to the device of claim 1, it is characterized in that: the control signal (UV) of vertical deflection (V) is by making the transducer that is arranged side by side on the horizontal direction (A, B or C, voltage D) and subtract each other (10) and obtain.

4, according to the equipment of claim 1, it is characterized in that: in the telecommunications projector equipment three kinds of primary colours R, G, six control voltages of B and three yawing moments are sent into six auxiliary deviation coil (RH, RV, GH, GV, DH and DV) in carry out the convergence of three electron beams.

5,, it is characterized in that above-mentioned control signal and the convergence correction signal addition of sending in the convergence coil respectively according to the equipment of claim 4.

6,, it is characterized in that holding circuit (15) is positioned on the path of above-mentioned control signal according to the equipment of claim 5.

7, according to the equipment of claim 1, it is characterized in that the sensor signal relevant with light beam (L) position in the horizontal direction send into a low wave filter (20), this low pass filter (20) provides average voltage.

8,, it is characterized in that above-mentioned control signal can also be used to proofreading and correct north/southern error, parameters such as pincushion distortion, geometric distortion or anastigmatism in television receiver according to the equipment of claim 1.

9, according to the equipment of claim 1, it is characterized in that above-mentioned sensor unit (3) is arranged on the outside in efficient image zone, be directly arranged on the edge of image region or in the image region.