CN101595729B - A method for reducing temporal artifacts in digital video systems - Google Patents

Abstract

The present invention provides an image signal processor, comprising: (a) an input circuit for receiving and/or holding an image signal of N-bit binary data word, where N is a positive integer; (b) a data converter converting at least M-bit data of binary data into non-binary data having multiple bits, where M is a positive integer and N>=M>=2, wherein (c) all bits of the non-binary data have a weight which is equal to, or less than, that of the least significant bit of the M-bit data of binary data; and (d) the data converter outputting the each bit of the non- binary data in sequence starting from an equal data value.

Description

A kind of method that reduces temporal artifacts in the Digital Video System

The application is the non-provisional application version of the provisional application patent 60/840,878 of proposition on August 29th, 2006.Provisional application patent 60/840,878th, the part (CIP) that continues of the pending application 11/121,543 of filing an application on May 4th, 2005.11/121,543 is three patent applied fors (CIP) parts that continue, these three applications be respectively on November 1st, 2003 propose 10/698,620,10/699,140,10/699,143, aforementioned patent applications be these three one of them.Therefore, present patent application is with reference to the technology of announcing in these patents.

Technical field

The present invention relates to a kind of projection display system; Particularly; The present invention realizes the distribution that reconfigures of micro mirror operating state, thereby improves the temporal artifacts in the projection display system through binary control signal being converted to nonbinary signal controlling spatial light modulator.

Background technology

Showing industry dominate today after more than 100 year in the cathode ray tube (CRT) technology; Flat panel display (FPD) and projection display technique have been realized showing bigger image than projection on the large display screen with the small form coefficient of display control program, thereby have been received extensive welcome.In several kinds of projection display techniques, better image quality, lower manufacturing cost have obtained approval than flat panel display (FPD) owing to having based on the Projection Display of little Display Technique.Little Display Technique on the market in the projection display equipment mainly contains two kinds, and a kind of is little lcd technology (micro-LCD), and another kind is the micro mirror technology.Micro-mirror device uses non-polarized light, thereby with little compared with liquid crystal of using polarised light the advantage in the brightness is arranged.

Although obtained significant progress aspect the such electromechanical micromirror devices of spatial light modulator making in recent years, the demonstration that be applied to high-quality screen still has some restrictions and difficulty.For the display image of Digital Signals, can not show owing to tonal gradation enough causes image on the contrary especially, make picture quality be affected.

Dynamo-electric mirror assembly has caused extensive concern as a kind of spatial light modulator.Dynamo-electric mirror assembly is made up of the mirror array that many minute surfaces are arranged in.Usually arranging 60,000 to millions of mirror units that do not wait on the substrate surface of dynamo-electric mirror assembly.Shown in Figure 1A, the image display system 1 that has screen 2 has been done open in United States Patent (USP) 5214420.Light source 10 is used to produce the luminous energy that illuminates screen 2.The light beam 9 that produces projects on the lens 12 through the gathering of minute surface 11.Lens 12,13,14 form the light beam focalizer, and light beam 9 is focused on becomes light beam 8.Spatial light modulator (SLM) 15 imported by computer 19 through bus 18 Data Control, optionally 7 sensing magnifying glasses 5 also finally are presented on the screen 2 from the path with part light.Like Figure 1B, SLM 15 comprises a reflection mirror array, but this array form by the reflector element 17,27,37 of switch and 47, reflector element is formed by the speculum that is connected to dynamo-electric reflector apparatus substrate surface 16 through hinge 30 33.When unit 17 was in a position, 7 a part of light of penetrating 6 pointed to lens 5 along the path from the path, and the light in this path is exaggerated or is incident upon on the screen 2 along path 4, thereby forms an illumination pixel 3.When unit 17 was in another position, light beam just can not got on the screen 2, so pixel 3 is exactly dark.

Each mirror unit of forming mirror assembly all has the function of spatial light modulator (SLM), and each mirror unit all is made up of a minute surface and electrode.The voltage that is added on the electrode has produced minute surface and interelectrode Coulomb force, makes control and tilting mirrors become possibility.Operating state standard with mirror unit among this paper is a term: minute surface is " deflection ".

The voltage that puts on the electrode makes deflection mirror surface, and owing to the reflex to incident ray, the minute surface of deflection will change the catoptrical direction of propagation, and the change amount is relevant with the deflection angle of minute surface.Show that nearly all incident light all being reflexed to image the mirror status on the projected path calls " ON state " in this specification; And the mirror status that reflexes to incident light on the non-image demonstration projected path calls " OFF state ".

If the light (like ON state) that reflexes to projected path is a particular value with the ratio of the light (like OFF state) that not have to reflect projected path, promptly reflex to light quantity on the projection path when being less than ON state, mirror status is " intermediate state ".

As mentioning in the United States Patent (USP) 5214420, most of traditional image display unit all are to use the binary states control of minute surface, i.e. ON state and OFF state, and image displaying quality receives the restriction of limited tonal gradation.Especially in the traditional control circuit that uses PWM (pulse width regulator), least significant bit of control switch state (LSB) or minimum pulse width have limited the quality of image.Since minute surface or be operated in ON state, or be operated in OFF state, and the traditional image display device can not provide the pulse shorter than the least significant bit acceptable control time to control minute surface.By the minimum amount of light of gray scale decision, be light quantity in the internal reflection of short pulse width time.Limited tonal gradation has caused decrease in image quality.

Particularly, Fig. 1 C has provided typical mirror unit control circuit in the United States Patent (USP) 5285407, and this control circuit comprises a memory cell 32.Each transistor all is labeled as " M* ", and wherein " * " is transistor number, and all crystals pipe is isolated-gate field effect transistor (IGFET).M5, M7 are the p channel transistor; M6, M8, M9 are the n channel transistor.Capacitive load in capacitor C 1, the C2 representative memory cell 32.Memory cell 32 comprises an access switch transistor M9 and the latch 32a based on the SRAM design.The M9 that is connected to column rule receives data-signal through bit line.After M9 receives capable signal from word line, be conducting state, the data in the memory cell 32 can be read.Latch 32a is made up of two cross-linked inverter M5/M6 and M7/M8.These two inverters can provide two kinds of stable states: state 1: node A is a high potential, and Node B is an electronegative potential; State 2: node A is an electronegative potential, and Node B is a high potential.

Minute surface is by the driving that is applied to voltage on the adjacent positioned electrode, and on electrode, presents a predetermined deflection angle.Elasticity " landing sheet " is exactly to form at keeper electrode one end, and it can make minute surface contact with electrode, and when the deflection mirror surface state is opened, makes the reverse deflection of micro mirror.The landing sheet has identical current potential with keeper electrode, is short-circuited when having avoided keeper electrode to contact with micro mirror like this.

The minute surface that is prepared on the substrate is square or rectangle, and the length of side does not wait for 4 to 15 microns.Under such layout, the space between adjacent mirror facets produces reverberation inevitably, can't be used for the demonstration of image.The reflection of the reflection in minute surface gap rather than the minute surface adjacent mirror facets that weakened itself produces the contrast of display image, thereby causes the reduction of image displaying quality.In order to overcome such problem, can use layout techniques to be arranged in minute surface on the Semiconductor substrate, make the minute surface gap reduce to minimum.Mirror assembly is usually designed to and comprises the array that is fit to the quantity mirror unit, and each unit is as a pixel in the deflection micromirror display image.According to the VESE standard that VESA formulates, the unit number that is used for the image demonstration need be consistent with display resolution, or consistent with the television broadcasting standard.(resolution is: in the time of 1280x768), the minute surface spacing is 10 microns, and the catercorner length of mirror array is 0.6 foot when the mirror unit quantity of device meets WXGA in the VESA standard.

Control circuit control micromirror among Fig. 1 C is changed between two states, drives minute surface simultaneously and between the deflection angle that opens or closes (or position) shown in Figure 1A, vibrates.

The reflection of each mirror unit be used for the minimum controlled light quantity that image shows, like the gray level resolution of image in the numerical control image display, be to determine by the shortest time that minute surface can controlledly maintain " ON state " position.Each minute surface can maintain the shortest time of " ON state " position and controlled successively by multi-bit word.Fig. 1 D has shown the binary system time cycle of four following SLM of words control.Shown in Fig. 1 D, there is 1,2,4,8 four relative value the time cycle, and they are determining the lumen fraction of each word successively.Wherein " 1 " is least significant bit (LSB), and " 8 " are highest significant position (MSB).Under the PWM controlling mechanism, the minimum amount of light of decision gray level resolution receives " least significant bit " control, the brightness when in the shortest controlled time, minute surface being remained on ON state exactly.

Fig. 2 A be a tonal gradation not enough example.In this example, the brightness variable gradient is bigger, and pseudomorphism is obvious.Fig. 2 B is the example after gray scale is improved, and pseudomorphism does not wherein have so obvious.

Shown in Fig. 2 A, when the gray scale between the image pixel that closes on differs greatly owing to coarse gray-scale Control, between these image pixels that close on pseudomorphism has appearred.This has caused the deterioration of image.When the gray difference between the image pixel that closes on was big, this deterioration in bright viewing area was particularly evident.From Fig. 3 girl A image, can observe, have comparatively significantly pseudomorphism at its forehead, the bridge of the nose and upper arm place.Because the numerical control Display Technique can not provide enough tonal gradations, this technology limitation has caused the generation of pseudomorphism.Showing bright spot, like forehead, the bridge of the nose and upper arm place, the light intensity difference of adjacent pixels is obvious.Along with the raising of tonal gradation, even equally only double among the image pattern 2B, image deterioration also can effectively be improved.

Because micro mirror is controlled in standard-sized sheet or complete shut-down position, light intensity was determined by the time that micro mirror is in the standard-sized sheet attitude.In order to improve the tonal gradation of display, must improve micro mirror speed so that digital controlled signal has more figure place.

Yet, after micro mirror speed improves, need a more stable hinge to reach the required work period, and then make micro mirror guarantee the working life that requires.In order to drive the micro mirror of reinforcing under the hinge support, need higher voltage.This voltage may surpass 20 volts, even 30 volts.The micro mirror that the CMOS technology is made possibly be not suitable for being operated under the so high voltage, therefore needs DMOS or high-voltage MOSFET technology.In order better to control gray scale, the making of DMOS micro mirror needs more complicated manufacture craft and bigger device area.

Because the restriction of operating voltage just needs to sacrifice the precision of gray scale in order to make littler micro-mirror display more cheaply, this makes the traditional mode of micro mirror control face technological challenge.

Many patents about light intensity control are arranged at present, and these patents comprise United States Patent (USP) 5,589,852,6,232,963,6,592,227,6,648,476 and 6,819,064.Also have more patent or patent applications about the different shape light source.

These patents comprise United States Patent (USP) 5,442,414,6,036,318, and application 20030147052.United States Patent (USP) 6746123 has proposed to prevent the particular polarization light source of optical loss.Yet these patents do not provide and overcome in the digital control image display system effective solution that is caused limitation by the tonal gradation deficiency.

In addition, also have many patents, comprise United States Patent (USP) 20,25,143,2,682,010,2,681 about spatial light modulator; 423,4,087,810,4,292,732,4,405,209,4,454,541,4; 592,628,4,767,192,4,842,396,4,907,862,5; 214,420,5,287,096,5,506,597 and 5,489,952.

Yet for those of ordinary skill, the method that overcomes restriction discussed above and difficulty is not pointed out or is provided in these inventions.Improve the maximum difficulty of gray scale and be that traditional system only exists switch two states and the shortest ON state time.The shortest ON state time has determined the gradient height of gray scale among Fig. 2 A and the 2B.

The brightness lower than gradient can't be provided.If can produce the brightness lower than shade of gray height, just can improve tonal gradation, reduce the problem of picture quality deterioration.Above-mentioned pending application 11/121,543,11/136,041 and 11/183,216 all proposed to improve the solution of tonal gradation.

Though the raising of tonal gradation can be removed the pseudomorphism of still image, can not solve so-called interim pseudomorphism in the dynamic image.

When image is by Digital Signals and is in the motion, can observe interim pseudomorphism, shown in Fig. 3 B, more obvious than among Fig. 3 A of the pseudomorphism on its upper arm and the forehead.

Fig. 4 A, 4B and 4C have set forth the example of one 8 position digital signal.Among Fig. 4 A, the least significant bit of input signal (LSB) is presented in the minimum square frame in the left side, and highest significant position is presented in the maximum square frame in the right.Each all has a binary system time width, is called binary pulse width modulated (PWM).In a frame, least significant bit has minimum time width, and highest significant position has maximum time width.If all positions all are OFF, then be output as zero.If from first to the 7th all is ON, and the 8th be OFF, then is output as 127 shown in Fig. 4 B.If from first to the 7th all is OFF, and the 8th be ON, then is output as 128 shown in Fig. 4 C.

These two signals only differ 1 in number, but different on the demonstration time.First signal is in the Qian Ban district of frame, second bottom half at frame.

Human eye has the certain reaction time for incident light.If the time interval that eyes are incided in two light pulses is very short, then eyes can be identified as single light pulse with it.Along with the time of incidence prolongs at interval, eyes begin gradually they to be identified as two different pulse.The reaction time that it has been generally acknowledged that human eye is 20 milliseconds promptly 50 hertz.The scanning frequency of eurovision is 50Hz, so we can feel the flicker of eurovision, and is 60Hz in the scanning frequency of U.S.'s TV, and we just can not feel its flicker.

Because reaction time of human eye is higher than the frame frequency of 60Hz, enough lack the blanking time of pulse among Fig. 4 B and Fig. 4 C, so human eye seems enough smoothnesses to the synthetic picture that makes of light.If the brightness degree of these two pixels shown in Fig. 4 B4C is 127 and 128, when their adjacent one another are and images move, then can produce another kind of pseudomorphism, be called " temporal artifacts ".

Fig. 5 has set forth the reason that these pseudomorphisms produce.When picture was in the motion, spectators' eyes can be followed the trail of it.Human eye is that two neighbors are accomplished to the synthetic of incident light, and this accomplishes different with tableaux by single pixel.If display is by Digital Signals, be ON state (like Fig. 4 B) in the bottom half pixel of a frame, be ON state at its neighbor of upper half, the synthetic light in spectators' eyes will be double brightness so, shown in Fig. 5 bright line.Here it is is the interim pseudomorphism phenomenon in the middle of the Plasma Display that people knew.Yet these pseudomorphisms do not occur over just in the Plasma Display, in numerical control shows, can take place yet.The invention provides the solution that some avoided or reduced this interim pseudomorphism.

Through above-mentioned discussion, Figure 1A has described traditional Display Technique from the one dimension angle.Fig. 2 A and 2B have defined gray scale, and have set forth the pseudomorphism increase that is caused by low gray scale through the Figure 1A to 1D that uses in the conventional display system.The problem of pseudomorphism has been described with women's photo among Fig. 3 A, because tonal gradation is not enough, personage's forehead and last arm region exist tangible non-natural bright line bar or bright in the photo.Fig. 3 B is the example of an interim pseudomorphism, and some non-natural lines are high-visible in display image.Fig. 5 has explained the reason that these non-natural lines produce.Shown in Fig. 4 B and Fig. 4 C, just the raising of brightness can cause that also two neighbors are temporal than big difference in ON state.This is because the ON state of 127 grades of brightness is in the upper half of frame, and the ON state of 128 grades of brightness is in the bottom half of frame.When the picture as women's picture moved in screen, human eye can be followed the trail of picture.Because the variation at this visual angle, the synthetic of incident light do not occur in same pixel, but occurs between the pixel.In Fig. 5, the brightness of the 4th pixel is improved at the upper half of frame, and the brightness of the 5th pixel is improved at the bottom half of frame.This causes neighborhood pixels brighter than the 5th pixel artificially.Pseudomorphism shown in Fig. 3 B can let spectators feel uncomfortable.It is very necessary to eliminate this pseudomorphism.

By on can know, be necessary to improve display system to avoid this deterioration of image quality.Therefore need further to improve all difficulties and the restriction that image display system solves above-mentioned discussion.

Summary of the invention

On the one hand, the present invention causes through elimination and exists this reason of a plurality of ON states to eliminate in the frame of temporal artifacts or reduce temporal artifacts.ON state and OFF state period through to a two field picture arrange again, eliminate or have reduced temporal artifacts.

On the other hand, the present invention utilizes nonbinary PWM that high position data is set, and has reduced the interval of an I picture ON state time.

In a preferred embodiment, display system control procedure of the present invention has used the m position that input signal is the highest to convert to be positioned at the nonbinary ON state pulse at frame head or frame end, and the mediate method of attitude of remaining low level.

Description of drawings

Contrast advantages following detailed description can be to of the present invention above-mentioned and other targets are distincter.

Figure 1A has showed the Projection Display basic principle of micromirror device;

Figure 1B has showed the basic principle of using the Projection Display of micromirror device;

Fig. 1 C has provided the example of a drive circuit in the early time;

Fig. 1 D has shown binary pulse width modulated (Binary PWM) mechanism of the conventional digital micromirror that is used to produce gray scale;

Fig. 2 A has showed the not enough example of tonal gradation, and its difference in brightness is very big, and tangible pseudomorphism is arranged;

Fig. 2 B has showed the example that gray scale is improved, and its pseudomorphism improves;

Fig. 3 A has showed that gray scale is not enough, the tangible example of pseudomorphism;

Fig. 3 B has showed the example of the same image after gray scale improves;

Fig. 4 A has showed the example of 8 position digital signals;

Fig. 4 B has showed the example of 8 position digital signals;

Fig. 4 C has showed the example of 8 position digital signals;

Fig. 5 is for describing the image of temporal artifacts occurrence cause;

Fig. 6 has set forth the basic structure of an embodiment;

Fig. 7 has set forth the example of a micro mirror element;

Fig. 8 has set forth a traditional binary PWM;

The for example clear basic display system of using five binary input signals based on one embodiment of the invention of Fig. 9;

Figure 10 has set forth to be divided into five input binary signals and has converted front three into least significant bit the 3rd and with back two another embodiment that convert the 5th of least significant bit into;

Figure 11 has set forth, and with 5 input signal separated into two parts, and further high position data is divided into another embodiment of 4 parts;

Figure 12 has set forth various types of intermediate states;

Figure 13 has set forth 5 position digital signals that will import and has been divided into two parts, another embodiment that low level is wherein driven by intermediate state;

Figure 14 has set forth and has utilized vibrational state to realize the example of the micro mirror element of intermediate state;

Figure 15 A has set forth and has alternately utilized some optical axises to realize the example of the micro mirror element of intermediate state;

Figure 15 B has set forth and has alternately utilized some optical axises to realize the example of the micro mirror element of intermediate state;

Figure 16 A has set forth the example of the complete reflecting incident light of ON state micro mirror;

Figure 16 B has set forth the not example of reflecting incident light of OFF state micro mirror;

Figure 16 C has set forth the example of vibrational state micro mirror reflecting part incident light;

Figure 17 A is the another kind of structure of clear deflection unit for example;

Figure 17 B has shown that micro mirror sees through the ratio of the light intensity of projection prism under ON state and vibrational state;

Figure 17 C illustrates the state of the micro mirror in a frame of deflection unit shown in Figure 17 A;

Figure 18 A illustrates another structure of deflection unit;

Figure 18 B has shown catoptrical optical axis under ON state, OFF state, the intermediate state;

Figure 18 C has shown the reflection flux of every optical axis shown in the corresponding diagram 18B;

Figure 19 is the projection arrangement structuring concept figure based on the preferred embodiment of the present invention;

Figure 20 is the veneer projection arrangement structuring concept figure based on another preferred embodiment of the present invention;

Figure 21 A is based on optics synthesis system side view in the projection arrangement of the preferred embodiment of the present invention;

Figure 21 B is based on optics synthesis system front view in the projection arrangement of the preferred embodiment of the present invention;

Figure 21 C is based on optics synthesis system rearview in the projection arrangement of the preferred embodiment of the present invention;

Figure 21 D is based on optics synthesis system top view in the projection arrangement of the preferred embodiment of the present invention.

Embodiment

For describing the preferred embodiments of the present invention in detail, as a reference with above-mentioned diagram.Above-mentioned diagram reaches corresponding with it explanation only as example of the present invention, does not limit being additional to the claim that present embodiment is described in detail.Particularly, through with reference to figure 6 to Figure 16, will describe exemplary embodiments of the present invention below.

Fig. 6 is the functional-block diagram according to a projection display equipment of the present invention's realization.Fig. 7 is the sectional view of the slm pixel cell layout that in this projection display equipment, uses.

With reference to Fig. 6, projection display equipment 100 comprises a spatial light modulator (SLM) 200, control device 110, projection optical system 130 and light source optical system 140.Projection optical system 130 projects (not shown) on the display screen with projection light 313, and light source 140 sends incident light 311.Spatial light modulation device 200 receives incident light 311 and produces reverberation 312.Display system also comprises control device 110, and it is made up of processor 111, frame memory 112 and data converter 113.Processor 111 comprises microprocessor and the optical modulation device 200 of a control control device operating time.

The digital of digital video data (like binary data 400) that frame memory 112 maintenances receive from the external devices (not shown).The total amount of data that in a frame period, receives and be stored to frame memory is used for work and control.The demonstration of once upgrading realization one frame of binary data 400.Data converter 113 is handled the binary number of from frame memory 112, reading 400, produces the nonbinary several 500 be made up of bit string as dateout, and this will set forth below.Then, spatial light modulation device 200 will preset weight allocation and give each in the word string, will further set forth below.

In this exemplary embodiments, spatial light modulator 200 comprises a pel array 210, a row driver 220 and a line driver 230.Vertical bit line (identifying in the drawings) from row driver 220 intersects with the horizontal word line that comes to drive voluntarily 230 devices (identifying in the drawings), and a large amount of pixel cells 211 just place on these crosspoints.

Fig. 7 shows what each pixel cell 211 all was made up of the minute surface 212 of substrate upper hinge 213 supports.Minute surface 212 can oscillate to any inclination angle around hinge 213.

Mirror unit on the substrate 214 also comprises a closed electrode 215 and closes brake 215a what hinge 213 both sides symmetries was placed, and same also have a unlatching brake of opening on electrode 216 and the substrate 214.Closed electrode 215 is applied in a preset voltage, makes minute surface 212 deflect to and close brake 215a in order to produce the Coulomb force.Minute surface 212 reflexes to the light that departs from projection optical system 130 optical axises with incident light 311 and closes on the light path of direction.Open electrode 216 and be applied in a preset voltage, make minute surface 212 deflect to and open electrode 216 in order to produce the Coulomb force.Minute surface 212 reflexes to incident light 311 on the light path with the opening direction of projection optical system 130 optical axises coupling.

Micro mirror unit on the substrate 214 also comprises a closed electrode 215 and closes brake 215a what hinge 213 both sides symmetries was placed, and same also have a unlatching brake of opening on electrode 216 and the substrate 214.

Fig. 8 has described the course of work of an exemplary embodiments.Fig. 8 is the example of traditional binary PWM, and each has a weight that presets as multiplier and comes generation time length, in order to control a mirror unit.Because certain position is that 1 o'clock driving pixels is that 0 o'clock driving pixels is extremely closed for opening, this method is easy to realize.

Yet, owing to use the multiple-pulse of disperseing to control micro mirror, and the dispersion of the ON state time in a frame, method shown in Figure 8 shows that with regard to having caused the problem of pseudomorphism is even more serious.Fig. 9 is an exemplary embodiments of the present invention, and it is with in ON state time restriction to a consecutive pulses.The pulse duration controlling schemes of second row is labeled as " nonbinary optical mode 1 ".The time period of ON state pulse is placed on frame head, and the ON state burst length section of neighbor coincides.

The pulse duration controlling schemes of the third line is labeled as " nonbinary illumination mode 2 ".This controlling schemes has been described the ON state pulse and has been positioned at the last example of frame.This has guaranteed that also the neighbor ON state time period overlaps.Minimum time section in pattern 1 and the pattern 2 is with the mark among Fig. 9, and is corresponding with the shortest controlled time that LSB with incident optical signal presets.

Control the ON state/OFF state position of micro mirror with the binary data 400 of Fig. 8 waveform representative, will cause the instability of micro mirror vibration.Because the ON state time period of many dispersions is arranged in a frame, and control model 402 can't provide stable control model.This unsteadiness is because be different in order to each the weight that produces total ON state time (display brightness that it is representing pixel) under this binary system controlling schemes in " 1 "/" 0 ".

On the contrary, in the present embodiment, binary data converts non-binary data 500 to.ON state or the dispersion of OFF state time period in a frame have been avoided in this conversion.Therefore, ON state and OFF state time period just have been divided into two long sections continuous time, thereby have avoided the unsteadiness of micro mirror vibration.Minute surface control model 502 is produced by non-binary data 500.In non-binary data, bit string at first is set is " 1 ", bit string is set then is " 0 ", in order to the vibration of control micro mirror unit.The binary mode 1 of Fig. 9 second row has clearly been set forth this control.The weight 501 of non-binary data 500 is " 1 ", and this equates with the least significant bit (LSB) of binary data 400.

When frame head is position, continuous " 1 ", after this ON state time remaining that it is corresponding be and " 0 " corresponding OFF state during the time that problem of unstable is resolved.Be different from traditional P WM control procedure, to the no longer random distribution that is controlled in the frame of ON state and OFF state period.And in the traditional P WM control procedure, the on-off pattern is not strict with the such input digit video data of binary data 400.Non-binary data control procedure through after the use conversion is improved, thereby has reduced the noise of control signal.These noises can cause the temporal artifacts problem of similar minute surface control model display image by non-binary data 500 usually.

Fig. 9 the third line is a kind of method that the nonbinary of appointment produces minute surface control model 502.At first, corresponding with 0 figure place with the OFF state of nonbinary number " 0 " control micro mirror.Use some " 1 " to make minute surface in the continuous time period, keep ON state then, the ON state time is same corresponding with the figure place of " 1 ".In the procedure for displaying of a frame, be divided into the complete continuous time period through ON-OFF with minute surface 212, reduced the artifact problem during image shows.

Figure 10 is the embodiment of another control procedure of the present invention.What be labeled as " nonbinary mode 3 " one is about to input signal separated into two parts data.High position data has bigger short time interval, perhaps position.Low data has the lower time period, and this is the same with least significant bit (LSB) in the original input signal.Because the minimizing of amount of calculation, this control procedure has alleviated the burden of system designer.The ON state time places frame first in mode 3, and in control model shown in the third line 4, the ON state time places the frame end.These two kinds of control procedures have all reduced on-off conversion unnecessary in the frame.Particularly, the control procedure among Figure 10 is divided into two sections binary data 410 and 420 and convert thereof into the non-binary data in the mode 3 with 5 bit binary data 400.Apply different weights then respectively to binary data section 410 and 420, in order to generate non-binary data 510 and 520.The weight 521 of non-binary data 520 is by converted with minimum two the corresponding binary data of binary data 400 420.It is set to " 1 ", and is identical with the least significant bit of binary data 400.Simultaneously, Figure 10 is arranged in the nonbinary pattern 4 of nonbinary mode 3 next line.The weight of non-binary data 510 is produced by the front three binary data 410 of binary data 400, is set to " 4 ", is four times of non-binary data 520 weights.

Non-binary data 510 is compared with the figure place of the decimal system numerical value of binary data 400 with 520 total bit (like sub-frame number) and is able to reduce.The nonbinary mode 3 has been described one through " 1 " bit string generation minute surface control model 511 in the application non-binary data 510 and 520 and 522 example.Nonbinary pattern 4 has shown the process that produces minute surface control model 512 and 522 simultaneously, promptly at first establishes the reset bit string in the nonbinary of front several 510, and at first establishes the set bit string in the nonbinary of back several 520.

When application nonbinary pattern 4 was carried out minute surface control, it was a time period that the minute surface ON state time in the frame concentrates, rather than the time of several dispersion.The minute surface control model 512 of front has connected into the continuous time with the ON state time of the control model 522 of back, has suppressed the demonstration of interim pseudomorphism effectively.The non-binary data amount of using in this control procedure has simultaneously also obtained reduction.

Figure 11 has described another control procedure embodiment of the present invention.The input data are divided into two parts: high position data and low data, high position data are divided into four equivalent parts again.This four partial data is distributed among the frame, has reduced the ON state time interval of minute surface like this.In addition, such control procedure also has added benefit for the course of work that has high speed color wheel disc.Because can realize and many parts color wheel disc synchronised through dividing the control time section.

In the control procedure based on non-binary data pattern 5, the high-order portion of binary data is divided into four partial binary data 431,432,433 and 434 of identical figure place.Convert seven non-binary data 531,532,533 and 534 then respectively into.Next the low portion 435 of binary data 400 converts three non-binary data 535 into.In the nonbinary pattern 5 shown in Figure 11, above delegation produce nonbinary minute surface control model 541,542,543,544 and 545 through " 1 " bit string being placed initial portion.Below a behavior earlier " 0 " bit string is placed non-binary data 531,532,533 and 534 beginning parts, again " 1 " bit string is placed the process of non-binary data 535 aft section generation nonbinary minute surface control model 541,542,543 and 544.

A following line description of nonbinary pattern 5 a kind of process that can effectively suppress interim pseudomorphism.In this process, the ON state time of minute surface control model 544 is with the ON state time close proximity of the control model 545 of back non-binary data 535.Corresponding to the minute surface control model 531,532,533 and 534 of front non-binary data be used in come in the time period with a frame in each color of colour wheel synthetic.

Figure 12 has set forth the micro mirror element control exemplary embodiments of under multiple intermediate state, working.The vibrational state that is in the example 1 between on off state is controlled the demonstration that light modulated realizes projects images.Example 2 realizes the example of intermediate state for another through vibration between the position of the switch.Example 3 is an example through two vibrational states realizations of switch room intermediate state.

Figure 13 is for using the example of nonbinary pattern 6, and low data wherein is stable intermediate state.Mode 7 is for using the example of non-binary data, and its low data is a vibrational state.

Nonbinary pattern 6 and 7 comprises a minute surface control model 551 that is produced by non-binary data, and the time width that it is used to define a value is frame length Tf 3/34 is the weight of the position of t1 then as time width.And, be used to define a value time width that is frame length Tf 4/34 by the minute surface control model 552 that non-binary data generates, be the weight of the position of t2 then as time width.Control model 552 in the nonbinary pattern 6 is through the brightness with micro mirror regulation and control control chart picture on the position of intermediate state, and this point will be done further introduction in the back.Minute surface control model 552 in the nonbinary mode 7 rests on the minute surface 212 control luminance of display images between ON state and the OFF state through regulation and control, and this point also will be introduced in the back.

Sectional view shown in Figure 14 has been illustrated the typical implementation that a micro mirror is operated in intermediate state and vibrational state.Particularly, Figure 14 has shown that minute surface 212 is in first heeling condition of ON state position, second heeling condition in the OFF state position.The third state at intermediate position place.Minute surface 212 Be Controlled are parked in alternate oscillation between ON state and the OFF state, are vibrational state.

The minute surface control model 552 of nonbinary pattern 6 lets minute surface 212 be in intermediate state between ON state and the OFF state position to control luminance of display images and realize among the Figure 13 that more than describes.The minute surface control model 552 of nonbinary pattern 6 also can let minute surface 212 be between ON state and the OFF state vibration and realize.

Next the method for operating the attitude pixel cell 211 that mediates will be described.Controlling minute surface through control minute surface 212 between stopping at out and closing shakes between ON state and OFF state position.Figure notation to various opticses, different functional units and operation element in figure below is identical with above-mentioned diagram.

Figure 15 A and 15B have the typical micro-mirror device of a plurality of rotating shafts to be operated in the sketch map of intermediate state.Particularly, the micro-mirror device among Figure 15 A and the 15B comprises a cover intermediate state electrode 217 and intermediate state brake 217a, and they are symmetrically placed in the both sides of hinge 213.Hinge is positioned on the direction vertical with opening electrode 216 lines with closing electrode 215.Electrode 215 and 216 is symmetrically placed in the both sides of hinge 213.

The intermediate state reverberation 321a that pixel cell shown in Figure 15 B 211 produces projects incident light 311 and the interior light path of reverberation 312 these fixing angular ranges of overlapping.When minute surface 212 Be Controlled were tilted in intermediate state, reverberation promptly was projeced into intermediate state.Through controlling intermediate state electrode 217, intermediate state is on the plane relevant with OFF state electrode 215 and ON state electrode 216.

Shown in Figure 16 A and 16B, can adjust reflectivity through changing mirror angle.In adjustable angular range, the design minute surface supplies maximum display brightness in the ON state position, in the OFF state position minimum display brightness is provided.The position of adjustment micro mirror makes its reflecting part light, and so just can control display system and project the image that is lower than LSB brightness, thus the tonal gradation of raising display image.

By contrast, in traditional system, will affact the electrode in the minute surface to (0,1) signal, and can make micro mirror be in the ON state position, (0,1) signal definition applies no-voltage, the right electrode effect ON state high voltage for left side electrode, shown in Figure 16 A.Signal (1,0) is then in order to drive micro mirror to the OFF state position.

Figure 16 C is the minute surface control sketch map that is operated in oscillatory regime, is lower than the optical density of ON state position in the reflection density of this state micro-mirrors.Through two electrodes under the minute surface are applied no-voltage, i.e. the vibration of (0,0) signal controlling micro mirror.Through to electrode application voltage, micro mirror can be got back to ON state or OFF state again.And in the conventional ADS driving circuit shown in Fig. 1 C, make micro mirror be operated in the input system that needs multidigit under such state.

Not average reflectance not coexisting between 20% to 40% when various Computer Simulations have calculated micro mirror and mediate attitude or vibrational state according to the optical arrangement structure.If it is suitable that system is selected, reflectivity can reach 25% just 1/4.This makes under the situation that is not changing the input optical density, and display system can be controlled micro mirror, and to modulate brightness be original 1/4 light.When the electrode of a plurality of impulse actions under the minute surface that is in the ON state centre position, reflectivity can reach 3/4, like the arrow on Figure 16 C left side.

Except above-mentioned Figure 16 A, 16B and 16C, the pixel cell that each in the spatial light modulator 200 of present embodiment put by array also can have following structure.

Figure 17 A is the another kind of typical structure of pixel cell 211.With reference to Figure 17 A, top right plot is the minute surface 212 of the pixel cell 211 of hinge 213 supports, and the picture left above is the top view of pixel cell 211 behind the removal minute surface.Figure 17 A base map be minute surface 212 when favouring different angles pixel cell 211 along the sectional view of A-A ' direction.In the present embodiment, pixel cell 211 comprises an ON state brake 216a and an OFF state brake 215a.They are respectively on ON state electrode 216 and OFF state electrode 215.Distance between ON state brake 216a and variable optical axis AX is identical with the distance between OFF state brake 215a and ON state brake 216a.Simultaneously, the height of ON state brake 216a will be lower than OFF state brake 215a.

For the pixel minute surface of such setting, ON state electrode 216 applies preset voltage can make minute surface 212 turn to ON state and gradually near to ON state brake 216a.Minute surface reflexes to (reverberation when referring to ON state here) on the projection optics system 130 to incident light 311.

Incident light 311 projects on the minute surface 212 with the incident angle vertical with variable optical axis of appointment.OFF state electrode 215 is applied certain preset voltage, minute surface 212 is turned on the OFF state angle position, gradually near to OFF state brake 215a.Direct reflection incident light 311 makes reverberation can not project optical system 130 (reverberation when referring to OFF state here).When minute surface 212 was in OFF state, the voltage of termination on OFF state electrode 215 can make minute surface 212 get into oscillatory regime.The minute surface of vibration can reflex to the corresponding direction of minute surface 212 vibrational states with incident light.In a good embodiment, the inclination angle of minute surface positive 15 the degree in the time be ON state (ON state angle), the inclination angle-13 the degree in the time be OFF state (ON state angle).In typical embodiment, the height of ON state brake 216a is lower than the height of OFF state brake 215a, and this compares with the situation that two brake height equate, the incidence angle of the former incident light 311 can be mentioned.

On the contrary, if OFF state brake 215a is lower, act on the voltage of ON state electrode when interrupting ON state, this moment, micro mirror may be in oscillatory regime.

Use the pixel cell 211 in the present embodiment, when making its projection ON state 1/4 of optical density, can make controllable gray scale improve four times through control minute surface 212.

Compare in traditional veneer continuous system the LSB duration of using 8 control signals, 256 gray scales are arranged, time span is about 20 microseconds, present embodiment can application 10 control signal, that is to say 1024 gray scales.In addition, use the device of three minute surfaces 212 can application 12 control signal, i.e. 4096 gray scales.

Different with conventional art, improve tonal gradation in order to use vibrational state above-mentioned, it is flexibly soft that the spring of hinge 2113 is preferably wanted.The time of minute surface 212 vibrations is longer than the time T of setting.Optical density ratio through projection optical system 130 is easy to be set at desirable value, and the pressure that therefore acts on hinge 213 springs is very little.The raising of tonal gradation can not receive the hinge restriction in 213 life-spans, and the control signal time interval that is used to prolong minute surface cycle of oscillation also can become longer.Even this long control cycle all is useful to the pixel quantity that improves.Video signal is provided on each bar line of minute surface 212 arrays.For practical operation,, for last pixel a digital signal is provided simultaneously for first pixel of single line provides a memory block.For wiredly vision signal is provided and is smaller than the time of least significant bit LSB for first pixel provides the time sum of vision signal once more.Consider the problem of data transmission period, can allow longer least significant bit, longer time to transmit more data.System can have more pixel and handles more high-resolution image and show like this.

Figure 17 C is for explaining the time showing figure at minute surface 212 states of the time of frame interior pixel unit 211.In the present embodiment, pixel cell 211 is set at control minute surface 212 and makes it and be in+ON state in 15 ° or be in the OFF state in-13 °.Simultaneously, can also control the vibrational state that micro-mirror device is in it between-13 ° and 13 ° shown in figure 17, to produce other gray scale.

Figure 18 A is the top view and the sectional view of another typical construction of pixel cell 211.In Figure 18 A, in last figure be the minute surface 212 (together with hinge) of pixel cell 211, left side figure be the top view of pixel cell 211 of removal minute surface, right side figure is the sectional view of pixel cell 211 (comprising minute surface 212) along B-B ' direction.Figure below is the sectional view of pixel cell 211 (comprising minute surface 212) along C-C ' direction.

Shown in Figure 18 A, pixel cell 211 has an intermediate state electrode 217 and intermediate state brake 217a in the present embodiment, so that the control specular working is in intermediate state.Certainly micro mirror also comprises ON state electrode 216, OFF state electrode 215, ON state brake 216a and OFF state brake 215a.ON state brake 216a equates with the spacing of OFF state brake 215a and variable optical axis AX1 with the spacing of variable optical axis AX1.The height of ON state brake 216a and OFF state brake 215a also equates.The height of intermediate state brake 217a is designed to be higher than ON state brake 216a and OFF state brake 215a.Intermediate state brake 217a will have special cross-sectional structure, contacts with its physics when optical axis AX1 tilts to avoid minute surface 212.The height of intermediate state brake 217a also need satisfy same requirement.The cross section of hinge 213 is near circular.

Through on ON state electrode 216, applying a predetermined voltage, minute surface 212 tilts until contact ON state brake 216a around optical axis AX1, arrives the ON state position.Minute surface reflexes to (reverberation when referring to ON state here) on the projection optics system 130 with incident light 311.Attention: incident light 311 is with the reflected at predetermined angles perpendicular to optical axis AX1.

Equally, the predetermined voltage that acts on the OFF state electrode 215 makes minute surface 212 turn to the OFF state position around reflection optical axis AX1, touches OFF state brake 215a until micro mirror 212.

The intermediate state electrode is applied a predetermined voltage, and minute surface 212 contact intermediate state brake 217a stop this voltage then, and micro mirror 212 works in the swing attitude.Minute surface is the yawing axis free oscillation with optical axis AX2, according to the vibration position difference incident light is reflexed on the corresponding direction.

Simultaneously, can control minute surface 212 contacts and the time of the attitude that mediates with intermediate state brake 217a.And the attitude that mediates.

In this exemplary embodiments, setting mirror unit inclination angle is ON state (an ON state angle) when being 13 °, is OFF state (OFF state angle) in the time of-13 °, is vibrational state (intermediate state angle) in the time of between+4 ° and-4 °.

Figure 18 B is the situation of minute surface 212 reverberation 312 optical axises when these three states of ON state, OFF state and intermediate state.Minute surface 212 tilts around reflection optical axis AX1, when ON state, incident light 311 is reflexed to (ON state optical axis) on the projection system 130, when OFF state, reflexes on (OFF state optical axis) beyond the system 130.

Simultaneously, when minute surface 212 is in vibrational state, incident light 311 is reflexed to the direction (intermediate state optical axis) of corresponding intermediate state.Minute surface makes the deformability optical axis AX2 vibration into yawing axis equally.

Figure 18 C has showed the flux of the reverberation 312 of each optical axis among the corresponding diagram 18B.Shown in Figure 18 C, when ON state, the luminous flux of reverberation 312 gets into projection optical system 130, has covered whole view field.Present embodiment can reflect the reflection light beam bigger than projection optical system 130 diameters in ON state.On the other hand, the catoptrical flux during OFF state does not project projection optical system 130.In vibrational state or intermediate state, only there is the partial reflection luminous flux to project on the zone that overlaps with system 130.

Figure 19 is based on another projection arrangement layout block diagram of the present invention.There is figure visible; Projection arrangement 5010 based on present embodiment comprises a single spatial light modulator (SLM) 500 (corresponding to above-described spatial light modulation device 200); A control unit 5500; 5300, one projection optical systems 5400 of a total internal reflection prism (TIR), and a light source optical system 5200.The just so-called unipolar plate projection arrangement 5010 of projection arrangement 5010 is made up of single spatial light modulator.Display system 5400 comprises spatial light modulator 5100 and the total internal reflection prism 5300 that is positioned at projection system 5400 optical axis places.Display system also comprises a light source optical system 5200, and the angle of its optical axis is different from optical system 5400.

Total internal reflection prism 5300 generates illuminating bundle 5600, and this light beam light source optical system 5200 from the side sends, and incides on the spatial light modulator 5100 with specific oblique angle, produces reverberation 5602 simultaneously.These reverberation be basically vertical reflection on spatial light modulator 5100, be transferred to projection optical system 5400 again.

, projected on the screen 5900 through optical modulator 5100 and total reflection prism 5300 by the reverberation 5602 of projection optical system 5400 projections, or be used for the image demonstration as projection light 5603.Light source optical system 5200 is by tunable light source 5210, optically focused camera lens 5220 and 5240, and bar-shaped condenser body 5230 is formed.Optically focused camera lens 5220 focuses on the light quantity that penetrates from tunable light source.Tunable light source 5210, be used to converge the collector lens 5220 that sends luminous flux from tunable light source 5210, bar-shaped condenser body 5230 is placed at the optical axis direction of light 5600 with collector lens 5240 successively.Light 5600 penetrates from above-mentioned tunable light source 5210, incides the side of total internal reflection prism 5300.

Use single spatial light modulator 5100 continuous multicolor display packings, projection arrangement 5010 has realized that the colour on screen 5900 shows.Tunable light source 5210 can comprise a red laser light source 5211, green laser light source 5212 and blue laser light source 5213, and can carry out the independent control of emission state to these three light sources.Tunable light source is divided into many subdomains (in this three sub-domain corresponding to red (R), green (G), blue (B)) with the frame in the video data; Make red laser light source 5211, green laser light source 5212 and blue laser light source 5213 open continuously in turn in time, each color will be described in detail below.Shown in structure, projection arrangement 5010 and with the control unit 5500 of aforementioned control device 300 structural similarities utilizes control method shown in Figure 16 to realize the control to spatial light modulator (being spatial light modulation unit 200) 5100.

Figure 20 has provided the functional block diagram based on another preferred embodiment projection arrangement of the present invention.Projection arrangement 5020, just so-called many plates projecting apparatus, be by many spatial light modulators 5100 (5100R for example, 5100G 5100B) constitute, this just with the difference of aforementioned projection arrangement.Projection arrangement 5020 is made up of some spatial light modulators 5100, between projection optical system 5400 and each spatial light modulator, is all arranged separating/combining optical 5310 of a light.Separation/combining optical 5310 is made up of a total internal reflection prism 5311, dispersing prism 5312 and dispersing prism 5313.The light 5600 that prism 5311 guiding are penetrated from projection optical system 5400 optical axises shines one side of spatial light modulator 5100.Dispersing prism 5312 will separate via the red incident light of total internal reflection prism 5311, makes it incide ruddiness spatial modulator 5100R, guides the reverberation 5602R of ruddiness to shine on the total internal reflection prism 5311 simultaneously.Similar with aforementioned image display system; Dispersing prism also can be isolated via blue light (B) in total internal reflection prism 5311 incident lights and green glow (G); And it is projected respectively on blue light spatial modulator and the green glow spatial modulator, simultaneously the reverberation 5602B of blue light and the reverberation 5602G of green glow are guided on the total internal reflection prism 5311.

Therefore; Modulating simultaneously by the optical modulator 5100 of correspondence respectively of red (R), green (G), blue (B) three kinds of colors; Reverberation 5602R after the modulation, 5602B and 5602G become incident light 5603 after via projection optics system 5400, project and have realized colored demonstration on the screen 5900.In these projection arrangement 5020 exemplary embodiments; The control device 300 that control unit 5500 before are described is similar, controls several optical modulators 5100 through using by the first minute surface control signal 411 and the second minute surface control signal, 421 synthetic modulator control signals 440.For fear of being subject to light separation/combining optical 5310, we it will also be appreciated that improving one's methods of some light separation/combining opticals.

Figure 21 A, 21B, 21C and 21D are for using the projection arrangement optical system structure block diagram of some spatial light modulators 5100.Figure 27 A is the side view based on the combining optical of present embodiment, and 27B is a front elevation, and 27C is a rearview, and 27D is a top plan view.The optical system of projection arrangement 5030 is made up of device bag 5100A in the present embodiment, and it has comprised 5340, one light source optical systems 5200 of 5100, one color combining opticals of some optical modulators and a tunable light source 5210.These spatial light modulators 5100 among the device bag 5100A are fixing in such a way: every limit of the rectangular shaped rim of modulator 5100 and device bag 5100A is at same horizontal plane and be nearly miter angle.

Color combining optical 5340 places on the device bag 5100; The two square prisms 5341 and 5342 that it comprises join in the vertical and become the equilateral triangle cylinder, and the optical waveguide module 5343 on the two prisms limit forms bottom-up right-angled triangle cylinder for being joined by the inclined-plane.Absorber of light 5344 and fixing optical waveguide module 5343 lay respectively at the both sides of prism 5341 and 5342.

Photoconduction the light source optical system 5200 of green laser light source 5212 to the bottom device of module 5343, the light source optical system 5200 of red laser light source 5211, and the light source optical system 5200 of blue laser light source 5213, and each light source all has vertical optical axis.The light 5600 that sends from green laser light source 5212 incides on the spatial light modulator 5100, passes fiber waveguide 5343 and prism 5341 in the bottom surface of prism 5341 with incident light 5601 incidents.Equally, the light 5600 that sends from red laser light source 5211 and blue laser light source 5213 incides on the spatial light modulator 5100.

The redness and the blue incident light 5106 that project on the spatial light modulator 5100 reflect from stationary exterior surface through prism 5342 backs vertically upward.Light promptly incides optical system 5400 through prism 5342 according to this sequence spread, generates projection light 5603 and is used for the image demonstration.Simultaneously; The green incident light 5601 that incides on the spatial light modulator 5100 passes prism 5341 through behind the vertical reflection as reverberation 5602; By its outer surface secondary reflection again, then along inciding on the optical system 5400 with red and blue reverberation 5602 identical light paths.When minute surface 212 was in ON state, the light process that projects on the projection optical system 5400 was treated as projection light 5603.

As stated, the mirror assembly individual devices bag 5100A based on present embodiment comprises two optical modulators 5100 at least.A kind of light-emitting mode is for only sending incident light 5601 from green laser light source 5212.Another light-emitting mode of optical modulator 5100 is for to send incident light from red laser light source 5211 or blue laser light source 5213.The light modulated of being modulated out by these two spatial light modulators incides respectively on the corresponding color combining optical 5340, and the amplification of process projection system 5400 projects on the screen 5900, or is used for the image demonstration as projection light 5603.Projection arrangement 5030 based on present embodiment is made up of control device 300, and it controls spatial light modulator 5100 through the mode of using modulator control signal 440 and multiple control method as previously mentioned to combine.Wherein adjustment signal 440 is synthetic by the first minute surface control signal 411 and the second minute surface control signal 421.

Though the present invention is described with the embodiment of above-mentioned optimization at present, we should be understood that this embodiment is not limited to above statement.Pore over above-mentioned detailed introduction and on top of the people of this skill be certain to expect many kinds of change and changes to device.Therefore, our purpose is will let separate statement crown all embody inventive concept, the change that belongs to the scope of the invention and change.

Claims (17)

1. image display system comprises:

Receive the signal processor of N position binary image signal, wherein N is a positive integer;

Above-mentioned signal processor also comprise one will be at least M position binary signal convert the data converter of multidigit nonbinary signal into; Wherein M is a positive integer; And satisfy N >=M >=2; Described data converter is with the mode of output zero-bit after the first whole nonzero digits of output, perhaps exports the non-binary data after the conversion with the mode of output nonzero digit after the whole zero-bits of output earlier;

Each of non-binary data all has a weight in order to the modulation image demonstration, and this weight is less than or equal to the M position least significant bit weight of binary number.

2. image display system according to claim 1, wherein: above-mentioned data converter also will convert the continuous N position in the N bit binary data into non-binary data.

3. image display system according to claim 1, wherein: data converter is divided into two parts at least to the N bit binary data, is converted into non-binary data then.

4. like the said image display system of claim 3, wherein: during the above-mentioned data of two parts at least of data converter output, begin output from those different with ortho position numerical value.

5. display device comprises:

A signal processor that receives N position binary image signal, wherein N is a positive integer; This signal processor also comprise one will be at least M position binary signal convert the data converter of multidigit nonbinary signal into; M is a positive integer; And satisfy N >=M >=2; Described data converter is with the mode of output zero-bit after the first whole nonzero digits of output, perhaps exports the non-binary data after the conversion with the mode of output nonzero digit after the whole zero-bits of output earlier;

At least one comprises the deflection micromirror devices of many mirror units:

Each of non-binary data all has one, and each of non-binary data all has a weight in order to modulate the weight that above-mentioned deflection minute surface realizes that image shows, this weight is less than or equal to the least significant bit weight of the M position of binary data,

Each mirror unit has two deflection states at least,

The deflection state that deflection state that mirror angle is fixing and mirror angle change,

Mirror unit is controlled by non-binary data,

When non-binary data bits per inch value equated, the deflection mirror surface state remained unchanged.

6. like the said display device of claim 5, wherein: data converter is exported each of non-binary data since an equal value in order.

7. like the said display device of claim 5; Wherein: each above-mentioned mirror unit has the fixing and two kinds of deflection states of mirror angle variation of mirror angle at least; Each mirror unit all receives the non-binary data signal controlling; When each bit value of non-binary data equates, every kind of deflection state all in continuous time hold mode constant.

8. like the said display device of claim 7, wherein: the fixing deflection state of mirror angle comprises that minute surface is in the deflected state at ON state angle, is in deflected state, the deflected state on certain angle between ON state angle and the OFF state angle at OFF state angle or neither is in the deflected state that the ON state angle is not in the OFF state angle yet.

9. like the said display device of claim 7, wherein: the deflection state that mirror angle changes is included in the above-mentioned minute surface deflected state that a certain angle changes or vibrates in ON state and OFF state, and the deflected state that unspecified angle does not change or vibrates in ON state and OFF state.

10. like the said display device of claim 5, wherein: above-mentioned data converter converts the M in the above-mentioned N position of above-mentioned binary data continuous position into non-binary data.

11. like the said display device of claim 5, wherein: the mode that data converter is exported above-mentioned non-binary data is for beginning output from that different numerical value is arranged with the phase ortho position.

12. a method for controlling display device comprises:

Receive the picture signal of N position binary word, wherein N is a positive integer;

Convert the position of M at least in the binary data into one group of non-binary data; The least significant bit weight of each non-binary data is less than or equal to the least significant bit weight of binary data; Wherein M is positive integer and satisfies N >=M >=2; Data converter is with the mode of output zero-bit after the first whole nonzero digits of output, perhaps exports the non-binary data after the conversion with the mode of output nonzero digit after the whole zero-bits of output earlier;

From having that beginning of identical numerical value to export in proper order with the phase ortho position;

Control spatial light modulation unit through using non-binary data.

13. like the said method for controlling display device of claim 12, wherein: the above-mentioned switch process of above-mentioned M bit binary data also comprises changing above-mentioned M bit data as the continuous N position in the above-mentioned N position of above-mentioned binary data.

14. like the said method for controlling display device of claim 12, wherein: the above-mentioned output step of above-mentioned non-binary data also comprises from " 1 " position beginning exports non-binary data in proper order.

15. like the said method for controlling display device of claim 12, wherein: the above-mentioned output step of above-mentioned non-binary data also comprises from " 0 " position beginning exports non-binary data in proper order.

16. like the said method for controlling display device of claim 12, wherein: binary data is divided into the continuous binary data of two parts at least, converts this two parts binary data to non-binary data then.

17. like the said method for controlling display device of claim 14, wherein: the above-mentioned output step of above-mentioned non-binary data comprises that also that different with the phase ortho position of on the data bit numerical value begins output.

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