CN1004962B - Video display system - Google Patents

Abstract

The present invention relates to a video display system which is provided with a video signal source, wherein the signal source supplies video signals to images of an odd frame field and an even frame field which scan in a mutual and interlacing mode. A first group of display units is used for the image of the odd frame field, and a second group of display units is used for the image of the even frame field; the two groups of display units display the images in an interlacing and alternate mode. Two groups of circuits are both provided with a latch circuit. When a frame field is scanned for the first time, the video signal of the image of the odd frame field is locked by the latch circuit of the first group of circuits; similarly, when the frame field is scanned for the second time, the vision signal of the image of the even frame field is locked by the latch circuit of the second group of circuits; when the frame field is scanned for the third time, the circuits provide the locked video signals for the second group of display units.

Description

Video display system

Briefly, the present invention is relevant with video display devices; More particularly, the invention relates to a kind of like this video display system, in this display system, display unit is to arrange by two dimensional form, or says and press the arrangement of X-Y matrix form; For showing required image, above-mentioned display unit is encouraged by desired data (vision signal) respectively.

Such video display devices has been suggested application, and promptly the display unit in the display unit is arranged by the X-Y matrix form.For showing needed image, these display units are encouraged by desired data respectively.

Same applicant has proposed can be used for the following display unit of above-mentioned video display devices.

With reference to figures 1 through accompanying drawing 4, the perspective view after the profile that they are respectively the front views of fluorescence display unit, cut off along the A-A line, the profile that cuts off along the B-B line and display unit are partly cut open.In these figure, the glass envelope of digital 1 expression display unit, it comprises header board 1A, bonnet 1B and sidewall 1C.Be equipped with in glass envelope 1 the inside: one group of fluorescence display segment 2(2R, 2G, 2B).One group of negative electrode K(K of corresponding above-mentioned fluorescence display segment _R, K _G, K _B) and one group of first grid G ₁(G _1R, G _1G, G _1B) and a public second grid (accelerating electrode) G ₂, each display segment all comprises a fluorescence coating on glass front plate 1A inwall.Form three display segment 2R, 2G and 2B on the inwall altogether, they correspond respectively to red, green, blue three fluorescence sections.Do more detailed description below with reference to accompanying drawing 5, carbon coating 3 is conductive layers, it is that form with frame is printed on the inwall of header board 1A.Adopt the method for printing to be coated in the carbon coating 3 formed frames with red, green, blue look fluorescent material again to form red, green, blue fluorescence coating 2R, 2G and 2B as display segment.Cause phosphor layer partly to be overlapped on the carbon coating 3.Above-mentioned fluorescent material is topped by metal back layer (being the aluminizing layer) institute by one deck glued membrane again, in addition, faces display segment 2R, 2G, 2B that above-mentioned phosphor layer constitutes, is furnished with filamentary cathode K in bonnet 1B _R, K _G, K _BWith corresponding first grid G _1R, G _1G, G _1B, and to these three first grid G _1R, G _1G, G _1BPublic second grid G ₂For instance, the structure of each filamentary cathode K is such, promptly is the material-carbonate tungsten heated filament surface applied one deck energy emitting electrons.Each filamentary cathode K _R, K _G, K _BBe tightened up the ground frame between conducting bracket 6 and 7, support 6 and 7 is distributed in the both sides of bonnet 1B respectively.One end of each filamentary cathode is fixed on the conducting bracket 6, and disposes elastic support 7 on another conducting bracket 7 _a, the other end of each filamentary cathode then is fixed in 7 _aOn.According to above-mentioned structure, the filamentary cathode that causes owing to the rising of temperature is the problem of elongation evenly, because of elastic support 7 has been arranged _aCompensation and obtained solution, therefore above-mentioned filamentary cathode just can not relax.First grid G _1R, G _1GAnd G _1BAll be to make the semicircular cylinder shape; The cylinder of semicircular cylinder is facing to each corresponding filamentary cathode; On above-mentioned cylinder, longitudinally be carved with many long and narrow groovings 8 by predetermined spacing again.The effect of long and narrow grooving 8 is can make the electronics that emits from filamentary cathode K pass grooving to be transmitted.At second grid G ₂Corresponding first grid G _1R, G _1G, G _1BThose parts also done or had long and narrow grooving 9, the position of each grooving 9 all faces the position of the long and narrow grooving 8 of first grid.According to above-mentioned introduction, second grid G ₂The structure of long and narrow slot portion 9R, 9G, 9B can be as described below, the first grid G that promptly their cylinder is corresponding with each _1R, G _1G, G _1BBe on the same center of circle.By above-mentioned structure, just can make the grooving 8 and 9 that passes first grid and second grid by filamentary cathode electrons emitted bundle as the crow flies, and come along the longitudinal diffusion of grooving.On the other hand, long and narrow cylinder grooving 9 is that part of not to be made into cylindrical shape if do on the second grid, but is made into (as shown in Figure 6) of horizontal plane.In this case, by the electron beam of cathode emission after passing second grid, its spread formed curve with respect to grooving vertically, curve inwardly slightly (as dotted line among the figure 30 ' shown in).

In addition, around display segment (or display element) 2R, 2G and 2B, disposed the cage 10 that constitutes by electric conducting material.Cage 10 not only can be used to shield because the electron beam hits first grid or the second grid G of cathode emission ₁Or G ₂The secondary electron 31 that is produced is in order to avoid fall adjacent display segment luminous (seeing accompanying drawing 6), and can constitute dispersing lens.The effect of dispersing lens is to make by each filamentary cathode K institute electrons emitted beam spreading to come, so that the topped whole corresponding display segment 2 of electron beam.In addition, cage 10 also is used as provides for example electric supply installation of 10 kilovolts of high pressure to each display segment.From assembly structure, cage 10 is to stand between the header board 1A and sidewall 1C of glass envelope 1, and combines with the method for frit sintering.In more detail as shown in Figure 7, cage 10 is made of three spaced-apart frameworks around all display segments, and on first of the framework relative upper end, be provided with the leg 11 of outside protrusion, then constitute anode pin 12 in another relative upper end, this pin is used to supply with high pressure (anode voltage).In addition, done outwardly-bent and whippy positioning element 13 in the both sides of cage 10.When cage 10 when glass envelope sidewall 1C packs into (as shown in Figure 8) from top to bottom, leg 11 is close to the upper surface of sidewall 1C, thereby supporting this cage 10, meanwhile forniciform positioning element 13 near the medial surface of sidewall 1C so that cage 10 is positioned the center.The upper end of cage 10 also is provided with aduncate lug 14, and projection 15 is all arranged on the surface of each lug.After in cage 10 is packed sidewall 1C into, again glass front plate 1A is placed above the sidewall 1C, and when sealing, projection 15 make with carbon coating 3 or metal after layer 5 contact (as shown in Figure 9).As a result, the high pressure from anode pin 12 just is added to display segment 2R, 2G and 2B together.At assembling stage, the anode pin 12 of introducing high pressure is outwards to draw from passing the sealing-in part between the upper surface of header board 1A and sidewall 1C, and filamentary cathode K, first grid G ₁With second grid G ₂Pin then be outwards to draw and also played the effect of supporting from passing the sealing-in part between back plate 1B and the sidewall 1C.For example, each first grid G _1R, G _1GAnd G _1BAll draw two pins, i.e. both sides 4 pins altogether in each side of glass envelope.Pin 16G as shown in accompanying drawing 4 ₁, 17G ₁And 18G ₁As for second grid G ₂, four pin 19G are arranged ₂Draw from four angles of bonnet 1B.The pin 20F of negative electrode K from supported on both sides frame 6 and 7 left, draw to the right in groups.Negative electrode pin 20F links to each other with 7 with every side stand 6 publicly.Equally, corresponding to each first grid G ₁With second grid G ₂, corresponding pin is connected also publicly.

22(sees accompanying drawing 9 by means of glass burn-back material), header board 1A, sidewall 1C and bonnet 1B reciprocally are packaged into one have just formed glass envelope 1.There is an exhaust to cut hole 21 on the bonnet 1B, also seals with glass burn-back material.

Begin to narrate the operation principle of display unit now with said structure.Anode voltage (as 10 kilovolts high pressure) adds to red, green and display segment 2R, 2G and 2B blue look by anode pin 12.Add to first grid G _1R, G _1G, G _1BVoltage for example be 0 to 30 volt, and add to second grid G ₂Voltage as being 300 volts.Every filamentary cathode K _R, K _GAnd K _BConsumed power be approximately 60 to 70 milliwatts.Press said structure, the service voltage of anode and second grid G is constant, and first grid G ₁Service voltage be variable so that can switch on and off each display segment selectively.More particularly, as first grid G ₁Service voltage when being 0 volt, be cut off by negative electrode K electrons emitted bundle, thereby its corresponding display segment is not luminous.And as first grid G ₁When for example adding 30 volts of voltages, pass first grid G by negative electrode K electrons emitted bundle ₁After, again by second grid G ₂Quicken, collide at last on the fluorescent material of corresponding display segment 2, so that it is luminous.At this moment, the fluorescent brightness of display segment is to add to first grid G by control ₁The pulse duration of voltage (30 volts).Electron beam scatters because of the effect of cage 10 as shown in Figure 6, so the face of whole display segment 2 is all topped by electron beam institute.When the electron beam hits that is gone out by cathode emission was on first grid and second grid, just collision place at two grids produced secondary electron 31, but these secondary electrons are subjected to stopping of cage 10, so they can not collide on the adjacent display segment 2.Like this, by controlling the voltage that adds to first grid selectively, just make display segment 2R, 2G and 2B send stronger fluorescence selectively.

This fluorescence display unit 40 constitutes with sheet form.In addition, low-pressure side pin (for example pin of the pin of negative electrode and first grid and second grid) is to draw from the limit of the bonnet 1B of glass envelope 1, and on high-tension side anode pin 12 then is to draw from the header board 1A end of glass envelope 1.Because high voltage pin and low-voltage pin are drawn from both sides respectively, thereby just avoided the danger that may cause between interdischarge interval or wiring, just guaranteed that so also display unit can provide stable fluorescence to show.

In addition, owing to introduced anode high voltage to being centered around each display segment 2 cage 10 on every side, cage 10 has just been formed one group of dispersing lens.Therefore, even be first grid G ₁Shape be cylinder bending, and second grid G ₂Be the plane, (as shown in Figure 6), be still laterally scatter (along the direction of grooving) by negative electrode K electrons emitted bundle, and the whole surface of topped display segment 2.Simultaneously, also stopped from the secondary electron of first grid and second grid, so the adjacent display segment of closing can be not luminous because of the excitation of secondary electron by cage 10.

Under the situation that colour shows (for example, in the situation of 9300 ° of K white maps), the mixing ratio of brightness is: be that blue streak, about 13% is that ruddiness and about 80% is green glow about 7%.Use under the situation of filamentary cathode as electron emission source, in many application scenarios, in order to make the filamentary cathode that is employed predetermined working life can be arranged, their working temperature has certain limited field.And the fluorescent intensity that green fluorescence negative electrode (below be called the shade of a tree utmost point) is produced will be higher than the problem of the fluorescent intensity that other negative electrode produces and can be solved by the number that increases the shade of a tree utmost point.For example, can use two shade of a tree utmost point K _G, and only use a red negative electrode K _RWith a blue negative electrode K _BAs a result, the electronics sum that produces green fluorescence is greater than the electron number that produces red fluorescence and Lan Se fluorescence, causes the colour that might influence demonstration.Much less, the number that increases red negative electrode and blue negative electrode also is effective for the useful life that prolongs them naturally.So, by increasing the method for shade of a tree utmost point number, make the shade of a tree utmost point more than other negative electrode, this is desirable method to the briliancy of strengthening green fluorescence and the white light balance of obtaining.Therefore, these negative electrodes can not form the overload phenomenon, that is to say that the life-span of fluorescence display unit just can be extended.In fact, two shade of a tree utmost points spacing of arranging each other is approximately 0.8 to 1 millimeter.As for two shade of a tree utmost point electrons emitted total amounts, because electron scattering effect, although the emitting electrons recruitment is not one times of single shade of a tree utmost point emitting electrons quantity, can expect increases by 70% to 80%.Another way, the briliancy of green fluorescence also can be made to such an extent that the bigger method of ratio area red and blue look fluorescence coating increases by the area that makes the green fluorescence layer.

Because filamentary cathode is to work in the temperature limited region of defined, that is to say and burnt red for fear of oxide coated cathode, the capacity value of oxide coated cathode be decided to be its maximum allow capacity value 1/10th to a few tenths of, therefore, the electronics of every filamentary cathode emission quantity is less.A solution to the problems described above can strengthen the surface area of oxide fully, as spirality ground coiling tungsten filament.But, with regard to a long spiral, the defect that negative electrode is lax or vibrate most likely takes place.Consider this point, the structure shown in the accompanying drawing 10 and 11 is adopted in suggestion.

In the example of suggestion, heart line 35 is made by exotic material, for example with tungsten or the such material of molybdenum.The surface of heart line scribbles picture Al ₂O ₃Such insulating material 36.Be used as the outside of the tungsten filament 37 spiralitys ground of heater, then with electronic emission material 38(such as carbonate compound around heart line) be bonded in outside the helicoid with the method for spraying or electrodeposit, direct-heated cathode 34 has been made into.With spot welding or other suitable methods of attachment, an end of heart line 35 is fixed on the support 6, and the other end then is fixed on the elastic support 7 of another support 7 _aOn.Heart line 35 is to be anchored on support 6 and elastic support 7 stretchingly _aBetween.And spiral tungsten filament also be with spot welding or other suitable methods of attachment be fixed on second support 6 of support 6 and opposite side ' between.

Thereby by above-mentioned version, promptly negative electrode spirality ground is around heart line 35 outsides that scribble insulating material 36.Heart line 35 is tightened up by means of the elastic force of elastic support, like this, can get rid of such as the short circuit problem between adjacent two spiral coils in helicoid inside and the thermal deformation problem of spiral.In addition, oxide surface is long-pending has been increased fully; And because the temperature difference of negative electrode two ends and its middle body has diminished, uniform temperature distribution (A) has just broadened on the negative electrode.As a result, the electron number by cathode emission has increased.As a complete unit, the maximum heating current that allows of each negative electrode just may increase.Curve I shown in the accompanying drawing 11 has been represented temperature distribution history.

Like this, the fluorescence display unit just has been made into.In this example, cage is installed on ground, location around a plurality of display segments, since on the cage with high pressure be exactly the same high pressure that adds on the display segment, thereby formed dispersing lens around the display segment, by the electron beam of cathode emission just along horizontal broadening and be diffused into the whole fluorescent surface of each display segment (or display element).Thereby the demonstration that just might obtain high brightness.In addition, owing to exist cage to stop secondary electron, make it unlikelyly fall adjacently, thereby can realize that stable fluorescence shows by on the fluorescence coating of the display segment of barrier from control electrode or accelerating electrode.

When image display apparatus is to utilize above-mentioned fluorescence display unit to constitute, just need to adopt following assembly method.

That is exactly that the many above-mentioned fluorescence display unit 40(for example number of display unit are: 6 row * 4(are capable)=24) will be assembled in the part cartridge 41, to constitute parts as shown in figure 12.In the process that many like this display units is assembled in the part cartridge 41, display unit 40 is to be fixed on 41 li of part cartridges by sticking the applying of the adhesive of resin glue and so on.Yet, since the anode voltage of display unit 40 up to 10 kilovolts about, so, if install not firmly, in energized or using liquid cleaning agent when removing the dirty spot of spot on the display unit adhesive surface and so on, display unit 40 will split away off from adhesive surface.Equally, the variation of service condition also can cause this class fault.Therefore, display unit 40 must be packed on the part cartridge 41 securely.For this purpose, each display unit 40 should be made by following form, and the header board 1A that is exactly glass envelope 1 stretches out outside the sidewall 1C.In this example, header board 1A can all stretch out in outside the sidewall as accompanying drawing 13A all around, perhaps only stretches out in outside the sidewall in one direction as accompanying drawing 13B.From another point of view, display unit box 41 should be made into as shown in Figure 14, promptly on the front panel 42 of display unit box 41, a plurality of with respect to having on the position of display unit 40 (in this illustrated devices being 24) fenestra 43, step part 44 is made at back, edge at each fenestra, and the marginal portion of the size of step and each display unit header board 1A should match.Display unit 40 is that the back side from front panel 42 installs, so that header board 1A is positive towards fenestra 43, and display unit is fixed at the back side of using cement 45 such as resin glue one class to be coated in front panel then.In this example, because header board 1A is outwardly directed, its extension 50 is sandwiched between the front panel 42 of cement 45 and display unit box 41, thereby whole display unit 40 just is securely fixed on the display unit box 41.If necessary, can resemble shown in accompanying drawing 15 and 16 the time increase some connecting plates 53 again in assembling, this stator can rotate so that the extension 50 of the header board 1A of each display unit is sandwiched between the front panel 42 of it and display unit box 41 around axle 52.Then with the cement of resin glue one class they are clung again, with fixing of further assurance display unit.Because the luminance height of this display unit, the temperature that applies the fluorescence coating side at header board 1A is easy to rise higherly, therefore is necessary to take cooling provision, for example uses liquid cools.In order to reach this purpose, when being packed in each display unit on the display unit box, packing ring 54(such as silicone rubber gasket) should be clipped between the header board 1A of the step part 44 of front panel 52 of display unit box 41 and display unit, on them, adorn a transparent panel 55 of making by polycarbonate one class transparent material again, thereby can in by the fenestra 43 formed spaces of transparent panel 55, header board 1A and display unit box 41, inject cooling fluid 56.In this example, on the front panel 42 of part cartridge 41, do the cooling fluid that is communicated with fenestra 43 and inject groove 57.If mode without cooling fluid 56 coolings.Also can adopt a fan, so that display unit is carried out air cooling.

After the assembling of finishing above-mentioned display unit, more many above-mentioned display units are arranged by the X-Y matrix-style, for example by 7(row) * 5(is capable)=35 mode arranges to form an assembly, 5 assemblies laterally arranged to form a submodule again.And then with many above-mentioned submodules (for example by the 9(row) * 4(is capable by the X-Y dot matrix way)=36 mode) make up.The submodule after the some above-mentioned this combinations always is fitted together, huge vision charactron (for example 25 meters high * 40 meter wide) has just been made successfully again.In this example, the sum of display unit is

36×5×35×24＝151，200

The sum of display segment then is three times of display unit, thereby is approximately 450,000.

Figure 17 A and Figure 17 B are respectively the front view and the profiles of the huge image display apparatus that builds up.For example this huge image display apparatus is to be of a size of 42 meters high, 47 meters wide buildings.The top of this building is image display portion, and its divides nine layers to build up, and the height of each layer is 2.688 meters, each layer laterally have 4 submodules.Have the central control room that stage, lobby and the operation, control chart image display device and the stage facility that carry out performing active used in the bottom of this building.

Image display apparatus has built up by above-mentioned approach.In this example, because the process of assembling is: before this 24 fluorescence display units were assembled into a display unit, and then several display units always are fitted together constitute a complete image display apparatus, thereby display unit just becomes and is convenient to operation and maintenance, also is convenient to install.The shape of the display unit of (be above-mentioned example in) made is that height and width all are 40 centimetres square in this example.

Should point out in passing, concerning above-mentioned this image display apparatus, when the shows signal corresponding to each display unit will be transmitted, can not concurrently shows signal be sent to about 450,000 visual display segments (or being called pixel) simultaneously.So the transmission of signal can only realize with the mode of scanning.Yet, in this example, display device adopts display unit to be assembled, if use the mode of known sequential lines scanning, wiring workload between the adjacent display unit of then transversely arranged each is very big, and therefore the installation of whole image display apparatus is very complicated with regard to what become.

In addition, because display unit is as previously described a sort of huge image display apparatus, if accurate mistake etc. when just being easy to cause visual colour contamination is carried out in the transmission of signal according to the analog signal load mode.Thereby, can consider to transmit signal by the form of digital signal.Also have, if the flat cable resembling usually is used as signal transmssion line, the highest signal velocity can be above about 300 kilo hertzs.Consider that from another point of view the time of transmitting the view picture picture intelligence should be shorter than a thirtieth second again.

Say again, in above-mentioned display unit,, thereby can consider to utilize the method for pulse width modulation (PWM) to realize the briliancy modulation because in order to make its cost not too expensive, the luminance variations linearity of designed display unit is relatively poor.Yet the technology that has earlier realizes that in per a thirtieth second time the circuit of pulse width modulation is very complicated, and when the time cycle that shows shortens, is operated in again under the situation of low briliancy that it is fairly obvious that the image flicker phenomenon just becomes.

Therefore, a target of the present invention is that a kind of video display system of being convenient to transmit picture intelligence will be provided.

Another target of the present invention is that a kind of video display system that can realize the briliancy modulation with simple circuit structure effectively will be provided.

It is that a kind of video display system of assembling and keeping in repair be convenient to will be provided that the present invention also has a target.

Narrate from one aspect of the present invention, video display system provided by the invention comprises:

A video signal source, this signal source provides vision signal for interleaved odd field and even field;

The first group of display unit that is used for odd field;

The second group of display unit that is used for even field, it and first group of display unit are arranged by interleaved interlace mode;

First device, it provides the vision signal of described odd field for described first group of display unit in a field time;

Second installs, and the vision signal of even field is provided for described second group of display unit in another field time that continues above-mentioned; The feature of above-mentioned stream oriented device is:

Described first device has a locking devicen, and this locking devicen pins the vision signal of odd field, provides the vision signal of being locked for described first group of display unit in described another field time after above-mentioned;

In described second device locking devicen is arranged, this locking devicen pins the vision signal of even field, is providing the vision signal of being locked for described second group of display unit in a described field time after another.

Narrate on the other hand from the present invention, video display system provided by the present invention comprises:

A plurality of display units of pressing the arrangement of X-Y matrix form,

The video signal source of odd field and even field vision signal is provided,

Exciting bank, this exciting bank provides the vision signal of odd field and even field for described display unit, so that half display unit is energized at described odd field, and second half display unit is energized at described even field; It is characterized in that: comprise locking devicen in the described exciting bank, this locking devicen is used for pinning vision signal, so that during described even field,, and during described odd field, provide the vision signal of being locked for described second half display unit for described half display unit provides the vision signal of being locked.

Narrate from further aspect of the present invention, video display system provided by the invention comprises:

A video signal source is to provide the vision signal of interleaved odd field and even field;

First group of display unit of described odd field;

Second group of display unit of described even field, two groups of display units are arranged by interleaved form;

Described first group of display unit and second group of display unit are separated into a plurality of display units, and the display unit in each display unit is arranged by the X-Y matrix form;

For described display unit provides the exciting bank of described vision signal, it is characterized in that:

Described exciting bank provides vision signal by following mode for described display unit, be that exciting bank provides vision signal to finish the complete demonstration of a described display unit for all display units in the display unit continuously, and then provide vision signal continuously for all display units in the adjacent next display unit, to finish the complete demonstration of this adjacent component

Narrate from a more deep aspect of the present invention, video display system provided by the present invention comprises:

A video signal source, this signal source provide map required vision signal;

One group of display unit that is used for constituting display device, each described display unit comprise some display units of arranging by the X-Y matrix form; And

One cover exciting bank, this exciting bank provides vision signal for described display unit, it is characterized in that described exciting bank is that all display units in the display unit are provided as and realize a described vision signal that the display unit map is required by following mode continuously, and then realize the complete required vision signal of map of this display unit for all display units in the adjacent next display unit are provided as continuously.

Other targets of the present invention, characteristics and superiority will be conspicuous by the narration below in conjunction with accompanying drawing.In all accompanying drawings, adopt same numeral for components identical or parts.

Fig. 1 is the front view of the applied fluorescence display unit of the present invention;

Fig. 2 is the profile after the fluorescence display unit among Fig. 1 cuts off along the A-A line;

Fig. 3 is the profile after the fluorescence display unit among Fig. 1 cuts off along the B-B line;

Fig. 4 is the perspective view after partly the cutting open of the fluorescence display unit among Fig. 1;

Fig. 5 is the amplification profile of display segment (display element);

Fig. 6 is the profile of explanation cage operation principle;

Fig. 7 is the perspective view of cage;

Fig. 8 is pack into plane graph in the capsule of cage;

Fig. 9 is the profile of display segment and part cage;

Figure 10 is the profile of another kind of filamentary cathode;

Figure 11 is a filamentary cathode shown in Figure 10 perspective view at assembling stage;

Figure 12 is for being assembled the front view of a display unit by a plurality of display units;

Figure 13 A and Figure 13 B represent the perspective view of other examples of display unit respectively;

Figure 14 is the profile after the display unit among Figure 12 cuts off along the C-C line;

Figure 15 is the profile of the another kind of assemble method of assembling display unit;

Figure 16 is the rearview of parts assembling method shown in Figure 15;

Figure 17 A and Figure 17 B are respectively the front view and the profile that have huge display unit building;

Figure 18 is the frame principle figure of video signal display system provided by the present invention;

Figure 19 and Figure 21 are respectively the schematic diagram of expression signal transfer system provided by the present invention;

Figure 20 A to Figure 20 G is respectively the signal waveforms that is used for illustrating video display system relative section provided by the present invention;

Figure 22 is the principle schematic of explanation by pulse width modulation exciting circuit of the present invention.

We do a description to the present invention with reference to the accompanying drawings now.

Figure 18 is a systematic square frame schematic diagram, and this schematic diagram is used for illustrating a concrete instance of video display system proposed by the invention.In this example, vision signal can be from input equipments such as TV camera 101, video tape recorder (VTR) 102 or tuners 103.Can select wherein arbitrary input equipment by input change over switch 104 is the input equipment of vision signal.All belonging to composite video signal by the vision signal that above-mentioned input equipment provided, for example is the composite video signal of balanced quadrature modulation (NTSC) system.At first deliver to decoder 105 by the vision signal that switch 104 is selected, this decoder is decoded into redness, green and three kinds of signal components of blue look with the composite video signal of sending here.Above-mentioned tristimulus signal component is added to each self-corresponding analog to digital converter (A/D converter) 106R, 106G and 106B again respectively and is converted into 8 parallel-by-bit digital signals.

These parallel digital signals are alternately delivered to memory sets 171(171R, 171G, 171B) and memory sets 172(172R, 172G, 172B), each memory all has a field pattern and resembles and show required memory capacity.Each memory in the above-mentioned memory sets 171 and 172 forms a scan converter, and each scan converter can convert 5 row input signals to 4 line output signals.In addition, again every triplex row of 189 selected in the sweep signal of each field pattern elephant after conversion horizontal line is made up and obtain one group of scan converter output signal, concerning showing that each field pattern resembles, always have 63 groups of (* 8 parallel-by-bit) scan converter output signals so.

In this example, the order of scan converter output signal is specific, Here it is after the process that transmits signal to a display unit (as previously mentioned) is finished, and the process that transmits signal to next (adjacent in other words conj.or perhaps) display unit just begins to carry out.Accompanying drawing 19 has provided the schematic diagram of two adjacent display unit U and U signal transport process, a map in the time the pairing digitalized data section of display unit provide in proper order by a storage, the order of sending data is by numerical order represented among the figure, among that display unit of on the left side U triplex row display unit 201 to 204,205 to 208 and 209 to 212 pairing pixel segment data transmits the triplex row display unit 213 to 216 corresponding to the right that display unit U after sending in the memory fully again, 217 to 220 and 221 to 224 pixel segment data.Therefore, the pixel segment data sequentially is shifted and is sent in the display unit on the right.In the accompanying drawing 19 with upper right "; " corresponding pixel data of each row of being indicated, provide by another memory in the time in next interleaved map.

These pixel datas are provided by each self-corresponding memory 171 and 172 simultaneously respectively.The process of sending above-mentioned pixel data from memory is such, is to send simultaneously corresponding to 63 groups of data of every triplex row.The data of being sent are connected to data selector 108, pixel data red, green and blue look is chosen from the data that memory is sent here selector 108 pointwises ground in the time every map, selected memory can not carry out write operation simultaneously, so that form 63 groups of new (* 8 parallel-by-bit) data-signals.Multiplex adapter 109 will become corresponding serial data signal from these 8 parallel-by-bit conversion of signals of selector 108.Optical signal converter 110 will convert corresponding light signal again from the serial data signal of multiplex adapter to.

The pairing 63 groups of optical signal datas of every triplex row horizontal signal by optical cable 301,302 ... 363 deliver to respectively transversely arranged parts group circuit 401,402 ... 463 core is represented all transversely arranged display units of display unit for every group here.

For example one arrange the pairing cross member group of display unit circuit 401 topmost in display unit, optical-electrical converter 111 will convert the corresponding signal of telecommunication again to by the signal that optical cable 301 is sent here.This serial data signal is fed in the demultiplexer 112 and goes, and separator converts the serial data signal of sending here to 8 parallel data signal again.This parallel data signal through data/address bus 113 concurrently simultaneously and 100 transversely arranged component circuitry 114 ₁, 114 ₂... 114 ₁₀₀And connect.

Parallel data signal from optical-electrical converter 111 is delivered to sync separator 115 simultaneously, forms required synchronizing signal at separator by the effect of predetermined circuit such as visalgen.This synchronizing signal is connected to timing signal and forms circuit 116.Timing signal forms circuit can form following timing signal respectively: frame pulse signal FP, this signal are every map time paraphase once (shown in accompanying drawing 20A); Parts clock signal UCK, this signal have 255 (shown in accompanying drawing 20B) in each field time; Pixel clock signal ECK forms 38 such pixel clock signals (shown in accompanying drawing 20C) altogether in the cycle of per two parts clock signal UCK; And initial pulse Ssup, the pulse duration of this initial pulse is the width (shown in accompanying drawing 20D) of a pixel clock signal, the latter forms constantly in the frame pulse signal paraphase.Above-mentioned frame pulse signal, parts clock signal, pixel clock signal and foregoing data-signal all are to deliver to corresponding components circuit 114 separately concurrently together by data/address bus 113 ₁, 114 ₂114 ₁₀₀And initial pulse is to deliver to first component circuitry 114 ₁.

63 cross member group circuit (401,402 ... the course of work of each the parts group circuit 463) all is identical.

The formation of the signaling conversion circuit of the arbitrary parts in the cross member group circuit as shown in Figure 21.In accompanying drawing 21,121 represent a shift register that has 38 grades.In this example, the pixel clock signal ECK that forms circuit 116 from timing signal is the input end of clock that adds to shift register 121 through data/address bus 113, and initial pulse Ssup is added to its data input pin simultaneously.Like this, from the shift register 121 shift signal S that send continuously at different levels ₁, S ₂S ₃₈(shown in accompanying drawing 20E).S in these shift signals ₁To S ₃₆Be connected to pixel circuit 201R, 201G, 201B, 202R, 202G, the 202B of each self-corresponding display unit 201 to 212 respectively ... to 212R, 212G, 212B and corresponding display unit 201 ' to 212 ' pixel circuit 201 ' R, 201 ' B, 201 ' G, 202 ' R, 202 ' G, 202 ' B ... 212 ' R, 212 ' G, 212 ' B.The square frame of representing with the dot-dash center line in accompanying drawing 21 is represented a parts group circuit, and they all have identical circuit structure.

Data-signal from data/address bus 113 is connected to all pixel circuit 201R to 212 ' B(concurrently shown in accompanying drawing 20F) frame pulse signal FP delivers to 201R to 212B, and the signal of frame pulse signal after inverter 122 is anti-phase delivered to 201 ' R to 212 ' B.

Signal S from shift register 121 ₃₈Be sent to d type flip flop 123, this d type flip flop forms an initial pulse signal Ssup ' (shown in accompanying drawing 20G) again, and this initial pulse Ssup ' is connected to next adjacent component circuitry.

Be used to encourage the luminous circuit of each pixel to constitute as shown in Figure 22.Promptly comprise latch circuit 131,132,8 reciprocal counters 133 of AND circuit and inverter 134.In accompanying drawing 22, one 8 latch circuit of 131 expressions, described latch circuit is added with data-signal from data/address bus 113 at its data input pin.AND circuit 132 has two inputs, an input incoming frame pulse signal FP or its inversion signal, another input and S ₁To S ₃₆In a certain signal link to each other.The output signal of AND circuit 132 then is added to the control end of latch circuit 131.8 reciprocal counters of in the accompanying drawing 22 133 expression, the data initialization end of described counter links to each other with the output of latch circuit 131, the signal S of pulse from shift register 121 that pack into of counter gating end ₃₈, and counter is added with parts clock signal UCK from data/address bus 113 at its input end of clock.When counter 133 was in state beyond complete zero, the output signal that its produces was connected to the first grid G of aforementioned each display unit.The output signal of counter 133 adds to it after inverter 134 is anti-phase counting stops end.

So in the pixel circuit of each component circuitry, corresponding displaced signal S ₁To S ₃₆Particular moment, latch circuit 131 pins and keeps data-signal from data/address bus 113, maintained data-signal is put data at shift signal S as giving of counter ₃₈The time engrave and be selected into counter 133.Reciprocal counter 133 begins counting then, just stops counting when counter is in all-zero state, and the output at counter 133 just obtains and the corresponding pulse width modulating signal of each data-signal like this.In this example, to be response component clock signal UCK falling counting to giving the data of putting with counter 133, owing to have the parts clock signal in 255 cycles in the time a map, so when data-signal is maximum, corresponding display element is energized all the time, and when data-signal was minimum value, corresponding display element was not energized, and the demonstration briliancy of display element can be divided into 256 grades like this.The first grid of each display unit pixel can both be encouraged by described pulse width modulating signal PWM.

In addition, at signal S ₃₈Arrival constantly, the initial pulse signal of next adjacent component circuit has produced simultaneously.After this 100 transversely arranged component circuitry come to this one and follow the process that a ground is repeating above-mentioned excitation display element.The required time of latch data is the cycle of two parts clock signal UCK in each component circuitry, 100 transversely arranged component circuitry are repeatedly finished the cycle of the time of above-mentioned latch data operation with regard to 200 parts clock signal UCK of needs so, like this, a map in the time 55 also remaining UCK cycles can finish transmission such as specific control signals such as synchronizing signals.

Because the frame pulse signal FP of next map is the inversion signal of a last map frame pulse signal, the process of motivation of second half interleaved pixel is identical with the foregoing process of motivation.At this time, present this pulse of previous field excitation is delivered in the pixel and is gone, thus continuous two map in the time each display element repeat twice ground and finish identical demonstration.

How to have narrated on 100 transversely arranged display units the process of displayed image above.The process of the cross member group displayed image on 63 groups of vertical direction is parallel simultaneously carries out, and the demonstration of view picture image has also just been finished thus.

Thereby the huge image of 25 meters (row) * 40 meter (OK) has shown.Press the graphical presentation system of said structure, since map data be a display unit then the mode of a display unit transmit, the transmission of next display unit map data will begin to carry out after a last display unit map data transport process is finished, and visual thus procedure for displaying is undertaken by parts ground.Connection between result's two adjacent component circuitry only needs a line just to send the initial pulse signal Ssup ' of a last component circuitry to next component circuitry, so the connection between the display unit becomes very simple.Data-signal and being connected of other signals from data/address bus can adopt the multiple-contact connector to realize.

Thereby after display unit interconnected, if changing the work that connects between them has again become simply, the assembling of display device and maintenance work were very easy too.For example, be out of order, only need have changed that out of order display unit just with a good display unit as a display unit.When changing, because the quantity of electrical connecting wires seldom, so can realize quickly and easily more changing jobs.Because line is less, can reduce equipment fault obstructed because of contact or that loose contact causes simultaneously.

Be pointed out that also following method can be used as the emergency measures of maintenance of equipment, between the input of fault display unit initial pulse and output, insert one exactly and count to 38 counter that the display unit of fault just can be removed then.Adopted above-mentioned emergency measures, can't other display unit have been exerted an adverse impact.In addition, in the time need checking, because the formation of various signals and transmission are all in the components interior realization, so the maintenance of a display unit is also become very easy to the circuit of certain display unit inside.

Because visual data presented is to send each transversely arranged display unit concurrently to, so the transmission of data can be carried out on low speed ground.That is to say that data transmit in described image display apparatus speed can be calculated with following formula:

60 * 255 * 38/2=290, the 7(kilohertz)

The maximum that this transfer rate is lower than flat cable (data/address bus) allows transfer rate 300KHZ, transmits data so just may use conventional flat cable.

Another superiority of above-mentioned image display apparatus is: because pulse width modulation circuit is to utilize reciprocal counter to constitute, so sort circuit is easy to be provided.

In addition, the transmission of map data is undertaken by following mode, be exactly to transmit two interleaved data-signals in the frame map time, thereby pictorial data only needs to rewrite once on each pixel circuit in the frame map time.Yet image is presented at and repeats in two vertical intervals of connection to show once, and image shows that repetition rate is 60 hertz, so the scintillation that image shows can be excluded.

According to the image display apparatus of the invention described above, signal transmits and has become simply, and can utilize simple circuit configuration to realize the briliancy modulation of displayed image.

In addition, the assembling of device and maintenance work have also become easily.

Above description is based on to be carried out on the basis to the example of single image display apparatus proposed by the invention.But it is evident that those skilled in the art can change above-mentioned device according to the spirit or scope of novel concept proposed by the invention, so claim of the present invention only should decide by the accompanying Claim book.

Claims (22)

1, video display system has:

A video signal source, this signal source is used to provide the vision signal of interleaved odd field and even field;

Arrange first group of display unit that is used for described odd field and the second group of display unit that is used for described even field every another row arrangement in every line;

First exciting bank, it is used for providing described odd field vision signal for described first group of display unit in a field time;

Second exciting bank, on continuing in another field time of one for described second group of display unit provides described even field vision signal, above-mentioned stream oriented device is characterised in that:

Described first exciting bank has locking devicen, and this locking devicen is used for pinning described odd field vision signal, and at another field interval that continues described, above-mentioned locking devicen provides the vision signal of being locked for described first group of display unit,

And described second exciting bank has locking devicen, and this locking devicen is used for pinning the even field vision signal, and at described another the field interval that continues, above-mentioned locking devicen provides the vision signal of being locked for described second group of display unit.

2, by the described video display system of claim 1, described locking devicen in described first exciting bank and second exciting bank has a pulse width modulation circuit, and this modulation circuit is a luminosity of controlling described display unit according to vision signal.

3, by the described video display system of claim 2, described pulse width modulation circuit has a counter, and described locked signal is as the initialize data of this counter, and counter carries out contrary counting according to the clock signal that is provided to initialize data.

4, by the described video display system of claim 1, described display unit is distributed in a plurality of display units, and the display unit of each display unit is arranged by the X-Y matrix form; Described exciting bank provides vision signal by following mode to described display unit, described exciting bank provides vision signal to show until the complete image of finishing this display unit to all display units of described parts continuously, then exciting bank again all display units in adjacent display unit provide vision signal to show continuously until the complete image of finishing described adjacent display unit.

5, video display system has:

A video signal source, this signal source provides the vision signal of interleaved odd field and even field;

First group of display unit of described odd field;

Second group of display unit of described even field, it and first group of display unit are arranged by interlace mode;

Described first group of display unit and second group of display unit are distributed in a plurality of display units, and the display unit of each display unit is arranged by the X-Y matrix form;

Exciting bank is used to described display unit that vision signal is provided; The feature of this video display system is:

Described exciting bank provides vision signal by following mode to described display unit, promptly, this exciting bank all display units in a described display unit provide vision signal to show until the image of the whole even field of finishing a described display unit or whole odd field continuously, then all display units in adjacent display unit provide vision signal continuously again, show with the whole even field of finishing described adjacent component or the image of whole odd field.

6, video display system has:

Be used to provide the video of interlacing or progressive-scan video signal to show the source

Many display units that are used to constitute display unit comprise many display units by the X-Y arranged in each described parts:

Be used to described display unit that the exciting bank of described vision signal is provided; The feature of this video display system is:

Described exciting bank provides vision signal by following mode to described display unit, be exactly that this device all display units in a described display unit provide vision signal to show until the complete image of finishing a described display unit continuously, then exciting bank again all display units in adjacent display unit continuously provide vision signal to show with the complete image of finishing described adjacent display unit; When described video demonstration source provides the vision signal of lining by line scan, be shown data and upgraded with the interlacing form.

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