CN103700350B - A kind of liquid crystal display that can eliminate motion image blurring - Google Patents
A kind of liquid crystal display that can eliminate motion image blurring Download PDFInfo
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- CN103700350B CN103700350B CN201410016303.2A CN201410016303A CN103700350B CN 103700350 B CN103700350 B CN 103700350B CN 201410016303 A CN201410016303 A CN 201410016303A CN 103700350 B CN103700350 B CN 103700350B
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Abstract
A kind of liquid crystal display that can eliminate motion image blurring, be made up of liquid crystal panel and backlight, driver module, backlight control module, key panel, power supply etc., backlight control module comprises delay circuit, stretch circuit, power driving circuit. Field system chronizing impulse in vision signal is sent in delay circuit, postpones TdelayTime, then be that width is T by stretch circuit broadeningonBacklight lightening pulse. Power driving circuit is lighted liquid crystal panel backlight in the time that backlight lightening pulse is effective. Be used for adjusting the brightness of liquid crystal panel backlight from the brightness control signal of display key panel. The time that liquid crystal panel backlight is lighted only has the T of regular displayon∕Tvsync, the mean power of liquid crystal panel backlight does not increase, and does not need extra heat dissipation design, simple in structure. Form all luminous components of liquid crystal panel backlight and remain that entirety is lighted, entirety is extinguished, do not need to be controlled respectively.
Description
Technical field
The present invention relates to image and show field, particularly a kind of moving image of can eliminating shows fuzzy liquid crystal displayDevice, can be applied to Security Inspection Equipments, food inspection equipment, film titler, dynamic information dissemination screen etc. and require clear demonstration fortuneMultiple fields of motion video.
Background technology
Liquid crystal display is the display device of main flow on current market. Since it comes out, although entering along with technologyStep, liquid crystal display has becomed more consummate day by day in many-sides such as screen size, spatial resolution, color fidelity, visual angles, but its demonstrationWhen moving image, distinctive fuzzy problem is but perplexing manufacturer and user all the time, has limited it at the clear demonstration motion diagram of needsThe application that image field closes. Research shows, it is to produce motion blur phenomenon that the distinctive image of liquid crystal display shows with change modeBasic reason. Liquid crystal display continues to show all pixels of piece image, until new image is while arriving, more from top to bottom byPoint, replace old image line by line. This lasting display mechanism produces people's vision system and persists effect, will in brainNewly, old image is superimposed, thereby produces fuzzy sense. The movement velocity of image is faster, i.e. position between new images and old imageMove greatlyr, fuzzy sense is stronger. For the observer who watches for a long time liquid crystal display equipment screen attentively for needs, they not only cannot seeClear the details of motion video, and eyes feel tired uncomfortable soon.
For the moving image that overcomes liquid crystal display shows fuzzy problem, existing different technical scheme at present:
Scanning technique backlight: the backlight of liquid crystal display is divided into many groups from top to bottom, and each group of order lighted. Due to backlightIn arbitrary group not luminous within the most of the time, for people's vision system, be equivalent to reserve between new, old imageThe long intermittent time, thus overcome visual persistence effect. In the situation that backlight group of number is abundant, this scheme is better desirableEffect, but the optical, electrical design of display backlight is all comparatively complicated, and cost is higher.
?screen insertion technology: the illuminating state that remains backlight of display, but for realizing the required each field pattern of human eyePicture does not continue the effect showing, compresses the time that each field picture shows, and between each field picture, insert black by software and hardware technologyColor image. But in order to hold the number of fields being multiplied in the lower unit interval, the field frequency of display need to significantly improve, therebyRequire the response speed of liquid crystal panel also to want corresponding raising. Therefore, this scheme exists design complicated equally, and what cost was higher asksTopic, and in the situation that field frequency raising multiple is less, effect is not ideal enough.
Image prediction compensation technique: insert technology type seemingly with blank screen, this technology need significantly improve the field frequency of display. Different, the image inserting between true picture is no longer black image, but is predicted voluntarily, calculates according to true picture by displayThe image of the motion intermediateness obtaining. Visible, the technical sophistication degree of this scheme is higher than blank screen interleaved plan, and these are insertedThe image entering may be also inconsistent with real scene, can not be in order to be effective naturally true to nature in reality.
High field frequency technology: to insert technology different with image prediction compensation technique from above-mentioned blank screen, the field frequency of image be not byDisplay promotes voluntarily, but is provided voluntarily by the image signal source of giving display. The obvious like this image prediction of avoiding losesGenuine problem. But, being subject on the one hand the restriction of image forming apparatus physical condition, not all image signal source has footEnough high field frequencies, on the other hand, the transmission of high field frequency, high-definition image is also comparatively difficult, thereby the method shortage generally shouldBy value.
Above-mentioned several technical schemes both can be used alone, and also use capable of being combined, to reach more good effect. But,As mentioned above, the common problem of these schemes is technical sophistications, and cost is higher, conventionally only for field of broadcast televisions, and only existsRequire the occasion that display area is larger to use. As for the small size liquid crystal display matched with ordinary individual's computer, due to skillThe dual reason in art and market, almost do not have up to now can clear demonstration moving image product, if hope for success this withCommon liquid crystals display is suitable, and in fact none product can be used. The clear observation image motion of current needs process that Here it isThe predicament that users face.
In fact, other Display Techniques beyond liquid crystal, are not to continue display mode but similar biography as long as it adoptsSystem CRT(cathode-ray tube) pointwise of display or the display mode of lining by line scan, can effectively avoid motion image blurring.Wherein, the area of plasma display is excessive, and resolution ratio is on the low side, and price is still higher up to now, cannot meet safety check inspection,The requirement that the equipment such as food inspection are small and exquisite to display volume, image is meticulous, cheap. And emerging OLED(organic light emissionDiode) display is subject to the puzzlement of technology, cost etc., and the area of practical product is too small, only can be used for mobile phone, panel computerIn, be applicable to the product of ordinary individual's computer still in development.
Summary of the invention
The object of the invention is to propose a kind of liquid crystal display that can eliminate motion image blurring, especially can disappearExcept the liquid crystal display of horizontal direction motion image blurring. When the direction of motion of image is taking level as main, basic in the vertical directionWhile stablizing, human eye will see that details, by the complete picture rich in detail presenting, can not produce sense of fatigue. Except specified otherwise, in literary composition" level " refers to the direction of line scan of video, and " vertically " is the field scan direction of video.
Widely apply example at such as Security Inspection Equipments, food inspection equipment, film titler, dynamic information dissemination screen etc.In, image is only motion in the horizontal direction conventionally, and moving image viewing area in screen vertical direction is in advance reallyFixed. In the layout of screen, conventionally there is the still image viewing areas such as menu bar, therefore, moving image viewing areaHighly be slightly smaller than screen total height, and, in moving image viewing area, exist an observer to pay close attention to position, this portionThe ratio that position accounts for screen total height is conventionally in 1/2. Position is paid close attention in institute of the present invention extracting method guarantee observer observationThere when moving image, have to be clear and without the display effect of ghost, guarantees the motion diagram at other positions in moving image viewing area simultaneouslyThough picture is slightly with ghost but clear and legible equally, the still image viewing areas such as menu bar keep original clear display effectConstant. Fig. 1, taking the Security Inspection Equipments of certain common model as example, shows the layout of this Security Inspection Equipments display screen.
A kind of liquid crystal display that can eliminate motion image blurring of the present invention, the same with conventional liquid crystal display,Mainly formed by several parts such as liquid crystal panel and backlight, driver module, backlight control module, key panel, power supplys, itsBe characterised in that, backlight control module wherein comprises delay circuit, stretch circuit, three main portions of power driving circuitPoint. Field system chronizing impulse in vision signal is sent in delay circuit, postpones TdelayTime, then again by stretch circuit broadeningFor width is TonBacklight lightening pulse. Power driving circuit is lighted liquid crystal panel backlight in the time that backlight lightening pulse is effective.Be used for adjusting the brightness of liquid crystal panel backlight from the brightness control signal of display key panel.
Wherein, according to the difference of adjusting principle, this brightness control signal both can have been introduced stretch circuit, by increasingOr reduce TonImprove or reduce the brightness of liquid crystal panel backlight; Also can introduce power driving circuit, by controlling TonTimeIn export to liquid crystal panel backlight instantaneous power adjust brightness.
A kind of liquid crystal display that can eliminate motion image blurring of the present invention, wherein, delay circuit is monostable by firstState device D1-A and periphery capacitance resistance ware form, and the field system chronizing impulse VSYNC that the first monostable unit D1-A is transfused to triggers, and produceThe raw duration is TdelayLow level pulse LEDDLY. Regulating resistance R2 can regulate TdelayWidth. Stretch circuitBe made up of the second monostable unit D1-B and periphery capacitance resistance ware, the second monostable unit D1-B is by low level pulse LEDDLY'sRising edge triggers, and the generation duration is TonLow level pulse LEDLIT. Regulating resistance R4 can regulate TonWidth. MeritRate drive circuit is made up of operational amplifier D2-A, triode V1, V2 etc. In operational amplifier D2-A, triode V2, resistance R 9Under the effect of feedback loop forming, the inverting input of operational amplifier D2-A, resistance R 9 two ends voltage will etc.In the voltage of the in-phase input end of operational amplifier D2-A.
Wherein, resistance R 4 and resistance R 7 can be used the push button digital regulation resistance with power failure memory function.
Wherein, brightness control signal derive from panel brightness increase, subtract button, can be added in resistance R 4 or resistance R 7 increasing,Subtract on button input pin, thereby change its resistance or point voltage contact position.
A kind of liquid crystal display that can eliminate motion image blurring of the present invention, its advantage and effect are: with commonLiquid crystal display compare, the time that liquid crystal panel backlight of the present invention is lighted only has the T of regular displayon∕Tvsync，Therefore the instantaneous power of liquid crystal panel backlight (11) need be promoted to the T of regular displayvsync∕TonDoubly, can allow human eye feelBrightness and the regular display of screen are suitable. But the mean power of liquid crystal panel backlight does not increase, therefore do not need volumeOuter heat dissipation design, simple in structure. And all luminous components that form liquid crystal panel backlight remain, and entirety is lighted, entiretyExtinguish, do not need as the scanning technique backlight of routine, be divided into many groups and controlled respectively. In sum, originallyInvent described liquid crystal display and in the time of specific implementation, do not have obvious technical difficulty, have significant economy.
Brief description of the drawings
Figure 1 shows that the screen layout of certain type peace Security Inspection Equipments
Figure 2 shows that the sequential relationship that field system chronizing impulse and backlight lightening are interpulse
Figure 3 shows that the backlight control module theory diagram of display of the present invention
Figure 4 shows that the backlight control module circuit diagram of display of the present invention
In figure, concrete label is as follows:
1, moving image viewing area 2, still image viewing area
3, screen total height 4, pay close attention to position
5, field system chronizing impulse 6, backlight lightening pulse
7, delay circuit 8, stretch circuit
9, power driving circuit 10, brightness control signal
11, backlight
Detailed description of the invention
Below in conjunction with Fig. 1-4 and embodiment, technical scheme of the present invention is described further.
As everyone knows, conventional liquid crystal display is mainly by liquid crystal panel and backlight, driver module, backlight controlA few part compositions such as module, key panel, power supply. The present invention only needs backlight control module wherein to re-start design, andDo not need to change other parts, can reach the object of elimination of level direction motion image blurring. Its general principle is: control backlightMolding piece lags behind each field system chronizing impulse 5 in the vision signal receiving a period of time and (is designated as Tdelay) after, trigger oneIndividual backlight lightening pulse 6, allows backlightly (be designated as T a field durationvsync) in only light the very short time and (be designated as Ton), as Fig. 2Shown in, be the sequential relationship between field system chronizing impulse 5 and backlight lightening pulse 6. Obviously, the ratio of each field picture displaying time onlyThere is Ton∕TvsyncIf this value is enough little, between the image of opposite field, enough intervals interlunation will be had, the general that human eye is seenIt is the unambiguous picture rich in detail of milli. If it is comparable to insert technology with aforementioned blank screen, Tvsync∕TonIts field frequency frequency of equivalence is logicalThe T that normal this method is usedonBe about Tvsync1/8 of value, therefore the field frequency frequency of equivalence is 8, avoids the effect of motion image blurringIt is 2 or 4 blank screen insertion technology that fruit is significantly better than field frequency frequency. TvsyncThe inverse of field frequency, the physilogical characteristics requirement of human eyeField frequency need can be avoided flickering, therefore T just now higher than 70HzvsyncConventionally should be in 14ms.
In fact, in the present invention, what human eye was seen is backlight lightening pulse liquid crystal panel significant instant status, thisTime there is the change of new field picture replace old one field picture in certain certain width region of screen vertical direction, if figurePicture is kept in motion, and that is to say that new and old image is different in this change region, and human eye will be seen old imageGhost. Obviously, adjust TdelayCan adjust in the vertical direction the position in image change region, make it cover still image viewing areaTerritory 2, and as far as possible away from paying close attention to region 4. If definition of TaltFor certain pixel of liquid crystal panel completes change required time,The ratio that image change region occupies screen total height 3 is (Talt＋Ton－Tblank）∕（Tvsync－Tblank), wherein TblankForVertical blanking time, is about Tvsync1/20. Common liquid crystal panel Talt∕TvsyncBe about 1/6～1/3, if Ton∕TvsyncBe 1/8, image change region accounts for 25%～43% of screen height 3, and all the other 57%～75% parts of screen are used for paying close attention to region 4Demonstration be completely enough. Obviously the response speed that, improves liquid crystal panel (shortens pixel change time Talt), shorten the back of the bodyThe bright time T of luminous pointon, be all conducive to pay close attention to the expansion in region 4. Under current technical conditions, really exist part to alternateRegion falls into the possibility of moving image viewing area 1, and now observer will see at the position edge contrary with image direction of advanceThere is slight ghost. Pay close attention to outside region 4 but ghost appears at, and ghost and image remain certain distance, thereforeCan't make human eye produce fuzzy and sense of fatigue. For a concrete application example, according to the actual feelings of this application exampleCondition is adjusted TdelayAfter, in routine use, do not need TdelayAdjust again.
A kind of liquid crystal display that can eliminate motion image blurring of the present invention, its backlight control module theory diagram asShown in Fig. 3, it comprises delay circuit 7, stretch circuit 8,9 three major parts of power driving circuit. In vision signalField system chronizing impulse 5 is sent in delay circuit 7, postpones TdelayTime is then that width is T by stretch circuit 8 broadenings againonBacklight lightening pulse 6. Power driving circuit 9 is lighted liquid crystal panel backlight 11 in the time that backlight lightening pulse 6 is effective. From aobviousShow that the brightness control signal 10 of device key panel is for adjusting the brightness of liquid crystal panel backlight 11. According to adjusting principle notWith, this brightness control signal 10 both can have been introduced stretch circuit 8, by increasing or reduce TonImprove or reduce liquid crystal faceThe brightness of backboard light source 11; Also can introduce power driving circuit 9, by controlling TonIn time, export to liquid crystal panel backlight11 instantaneous power is adjusted brightness.
For further understanding the concrete methods of realizing of backlight control module involved in the present invention, can be shown in Figure 4Circuit diagram. The first monostable unit D1-A and periphery capacitance resistance ware form delay circuit 7, the first monostable unit D1-A quiltsThe field system chronizing impulse VSYNC of input triggers, and the generation duration is TdelayLow level pulse LEDDLY. Regulating resistance R2 canRegulate TdelayWidth. The second monostable unit D1-B and periphery capacitance resistance ware form stretch circuit 8, the second monostable devicesPart D1-B is triggered by the rising edge of low level pulse LEDDLY, and the generation duration is TonLow level pulse LEDLIT. RegulateResistance R 4 can regulate TonWidth. Operational amplifier D2-A, triode V1, V2 etc. form power driving circuit 9. Put in computingUnder the effect of the feedback loop that large device D2-A, triode V2, resistance R 9 etc. form, the anti-phase input of operational amplifier D2-AEnd, the voltage at resistance R 9 two ends will equal the voltage of in-phase input end of operational amplifier D2-A. Therefore, when LEDLIT is lowWhen level, triode V1 cut-off, the voltage at resistance R 9 two ends will equal the partial pressure value of resistance R 6, R7, R8, the current collection of triode V2Best emitter stage has larger electric current to flow through, and backlight 11 is lit. In the time that LEDLIT is high level, triode V1 conducting, computingThe in-phase input end voltage of amplifier D2-A is almost 0, and the pressure drop in resistance R 9 is also bordering on 0, triode V2 cut-off, backlight 11Extinguish. Wherein, resistance R 4 and resistance R 7 can be used the push button digital regulation resistance with power failure memory function. Brightness control signal 10Derive from panel brightness increase, subtract button, can be added in resistance R 4 or resistance R 7 increasing, subtract on button input pin, thereby changeIts resistance or point voltage contact position. In the time that the resistance of resistance R 4 increases, TonWidth will increase, thereby backlight 11 is lightedTime lengthening, human eye perceives brightness increases. In the time that a point voltage contact position for resistance R 7 moves up, operational amplifier D2-A's is sameThe voltage of phase input raises, and the electric current that flows through backlight 11 increases, and makes equally brightness increase.
Claims (4)
1. can eliminate a liquid crystal display for motion image blurring, mainly by liquid crystal panel and backlight, display driver mouldPiece, backlight control module, key panel, power supply composition, is characterized in that: backlight control module wherein comprise delay circuit,Stretch circuit, three major parts of power driving circuit; Field system chronizing impulse in vision signal is sent in delay circuit, prolongsT latedelayTime is then that width is T by stretch circuit broadening againonBacklight lightening pulse; Power driving circuit is at the back of the bodyWhen the bright pulse of luminous point is effective, light liquid crystal panel backlight; Be used for adjusting liquid from the brightness control signal of display key panelThe brightness of crystal panel backlight;
Wherein, delay circuit is made up of the first monostable unit D1-A, resistance R 1, R2 and capacitance resistance ware C4, the first monostable devicePart D1-A, resistance R 1, R2 and capacitance resistance ware C4 connect successively, are connected between VDD-to-VSS, and the tie point of R2 and C4 is connected to D1-ATime constant control input end; The field system chronizing impulse VSYNC that the first monostable unit D1-A is transfused to triggers, and produces while continuingBetween be TdelayLow level pulse LEDDLY; Stretch circuit is by the second monostable unit D1-B, resistance R 3, R4 and resistance-capacitance devicePart C1 forms, and the second monostable unit D1-B, resistance R 3, R4 and capacitance resistance ware C1 connect successively, are connected between VDD-to-VSS R4Be connected to the time constant control input end of D1-B with the tie point of C1; The second monostable unit D1-B is by low level pulse LEDDLYRising edge trigger, the generation duration is TonLow level pulse LEDLIT; Power driving circuit by operational amplifier D2-A,Triode V1, V2, resistance R 5, R6, R7, R8, R9 form; R5 one end receives the low level pulse from stretch circuitLEDLIT, the other end is connected to the base stage of V1; R6, R7, R8 connect successively, are connected between VDD-to-VSS; The grounded emitter of V1, collectionThe tap of electrode and R7 is all connected with the in-phase input end of operational amplifier D2-A; The inverting input of operational amplifier D2-ABe connected with V2 emitter stage, output is connected with the base stage of V2; R9 is connected between the emitter stage and ground of V2, and backlight is connected on V2Colelctor electrode and backlight power supply between; The work of the feedback loop forming in operational amplifier D2-A, triode V2, resistance R 9With under, the inverting input of operational amplifier D2-A, the voltage at resistance R 9 two ends will equal the homophase of operational amplifier D2-AThe voltage of input.
2. a kind of liquid crystal display that can eliminate motion image blurring according to claim 1, is characterized in that: this is brightDegree control signal both can have been introduced stretch circuit, by increasing or reduce TonImprove or reduce liquid crystal panel backlightBrightness; Also can introduce power driving circuit, by controlling TonIn time, exporting to the instantaneous power of liquid crystal panel backlight comesAdjust brightness.
3. a kind of liquid crystal display that can eliminate motion image blurring according to claim 1, is characterized in that: resistanceR4 and resistance R 7 can be used the push button digital regulation resistance with power failure memory function.
4. a kind of liquid crystal display that can eliminate motion image blurring according to claim 1, is characterized in that: brightnessControl signal derive from panel brightness increase, subtract button, can be added in resistance R 4 or resistance R 7 increasing, subtract on button input pin,Thereby change its resistance or point voltage contact position.
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| CN104623896A (en) * | 2015-03-03 | 2015-05-20 | 成都龙腾中远信息技术有限公司 | Image gain device for domestic somatic game machine |
| CN106982046B (en) * | 2017-03-22 | 2020-08-04 | 中国电子产品可靠性与环境试验研究所 | Transient pulse width widening circuit and method |
| CN108564919B (en) * | 2018-04-26 | 2020-08-07 | 京东方科技集团股份有限公司 | Display method, display control device and display equipment |
| CN109275011B (en) * | 2018-09-03 | 2020-12-04 | 青岛海信传媒网络技术有限公司 | Processing method and device for switching motion modes of smart television and user equipment |
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| CN101609658A (en) * | 2009-07-14 | 2009-12-23 | 昆山龙腾光电有限公司 | Liquid crystal indicator and driving method thereof |
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| CN203706641U (en) * | 2014-01-14 | 2014-07-09 | 北京中盾安民分析技术有限公司 | Liquid crystal display capable of eliminating moving image blurring |
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| KR101435466B1 (en) * | 2007-01-07 | 2014-08-29 | 삼성전자주식회사 | Display apparatus and method for scanning a backlight thereof |
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| CN101609658A (en) * | 2009-07-14 | 2009-12-23 | 昆山龙腾光电有限公司 | Liquid crystal indicator and driving method thereof |
| CN102243843A (en) * | 2010-05-11 | 2011-11-16 | 乐金显示有限公司 | Backlight unit, liquid crystal display device using the same, and method for driving backlight unit |
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