CN203706641U - Liquid crystal display capable of eliminating moving image blurring - Google Patents
Liquid crystal display capable of eliminating moving image blurring Download PDFInfo
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- CN203706641U CN203706641U CN201420022414.XU CN201420022414U CN203706641U CN 203706641 U CN203706641 U CN 203706641U CN 201420022414 U CN201420022414 U CN 201420022414U CN 203706641 U CN203706641 U CN 203706641U
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Abstract
一种能够消除运动图像模糊的液晶显示器，由液晶面板及背光源、显示驱动模块、背光控制模块、按键面板、电源等组成，背光控制模块包括延时电路、脉冲展宽电路、功率驱动电路。视频信号中的场同步脉冲送入延时电路中，延迟Tdelay时间，再被脉冲展宽电路展宽为宽度为Ton的背光点亮脉冲。功率驱动电路在背光点亮脉冲有效时点亮液晶面板背光源。来自显示器按键面板的亮度控制信号用于调整液晶面板背光源的亮度。液晶面板背光源点亮的时间只有普通显示器的Ton∕Tvsync，液晶面板背光源的平均功率并不增加，不需要额外的散热设计，结构简单。构成液晶面板背光源的所有发光部件仍然是整体点亮、整体熄灭，不需分别加以控制。
A liquid crystal display capable of eliminating blurring of moving images is composed of a liquid crystal panel, a backlight source, a display drive module, a backlight control module, a button panel, a power supply, etc. The backlight control module includes a delay circuit, a pulse stretching circuit, and a power drive circuit. The field synchronizing pulse in the video signal is sent to the delay circuit, delayed by T delay time, and then stretched by the pulse stretching circuit into a backlight lighting pulse with a width of T on . The power driving circuit turns on the backlight source of the liquid crystal panel when the backlight turn-on pulse is effective. The brightness control signal from the key panel of the display is used to adjust the brightness of the backlight of the LCD panel. The lighting time of the backlight of the LCD panel is only T on ∕ T vsync of ordinary displays, the average power of the backlight of the LCD panel does not increase, no additional heat dissipation design is required, and the structure is simple. All the light-emitting components constituting the backlight source of the liquid crystal panel are still on and off as a whole, and do not need to be controlled separately.
Description
Technical field
The utility model relates to image and shows field, be particularly related to a kind of moving image of can eliminating and show fuzzy liquid crystal display, can be applied to Security Inspection Equipments, food inspection equipment, film titler, dynamically information dissemination screen etc. requires multiple fields of clear demonstration moving image.
Background technology
Liquid crystal display is the display device of main flow on current market.Since it comes out, although along with the progress of technology, liquid crystal display has becomed more consummate day by day in many-sides such as screen size, spatial resolution, color fidelity, visual angles, but when it shows moving image, distinctive fuzzy problem is perplexing manufacturer and user all the time, has limited its application in the clear demonstration moving image of needs occasion.Research shows, the distinctive image of liquid crystal display shows that with change mode be the basic reason that produces motion blur phenomenon.Liquid crystal display continues to show all pixels of piece image, until new image is while arriving, then pointwise from top to bottom, replaces old image line by line.This lasting display mechanism produces people's vision system and persists effect, in brain, new, old image is superimposed, thereby produces fuzzy sense.The movement velocity of image is faster, i.e. displacement between new images and old image is larger, and 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 see the details of moving image clearly, 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 arbitrary group in backlight not luminous within the most of the time, for people's vision system, be equivalent to reserve the longer quiescent interval between new, old image, thereby overcome visual persistence effect.In the situation that backlight group of number is abundant, this scheme is desirable obtains better effects, 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 do not continue for realizing the required each field picture of human eye the effect showing, compress by software and hardware technology the time that each field picture shows, and insert black image between each field picture.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, thereby require the response speed of liquid crystal panel also to want corresponding raising.Therefore, this scheme exists design complicated equally, the problem that cost is higher, 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 the image of the motion intermediateness of predicting voluntarily, calculating according to true picture by display.Visible, the technical sophistication degree of this scheme is higher than blank screen interleaved plan, and the image of these insertions 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: different with image prediction compensation technique from above-mentioned blank screen insertion technology, the field frequency of image is not to be promoted voluntarily by display, but is provided voluntarily by the image signal source of giving display.The obvious like this problem that can avoid image prediction distortion.But, being subject on the one hand the restriction of image forming apparatus physical condition, not all image signal source has sufficiently high field frequency, and on the other hand, the transmission of high field frequency, high-definition image is also comparatively difficult, thereby the method lacks general using 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, cost is higher, conventionally only for field of broadcast televisions, and is only requiring 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 the dual reason in technology and market, almost do not have up to now can clear demonstration moving image product, if hope for success, this is suitable with common liquid crystals display, in fact none product can be used.The predicament that the users of the clear observation image motion of current needs process that Here it is face.
In fact, other display techniques beyond liquid crystal, are not to continue display mode but similar traditional C RT(cathode-ray tube (CRT) as long as it adopts) 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 is on the low side, and price is still higher up to now, cannot meet the requirements that equipment is small and exquisite to display volume, image is meticulous, cheap such as safety check inspection, food inspection.And emerging OLED(Organic Light Emitting Diode) display is subject to the puzzlement of technology, cost etc., and the area of practical product is too small, only can be used in mobile phone, panel computer, is applicable to the product of ordinary individual's computer still in development.
Utility model content
The purpose of this utility model is to propose a kind of liquid crystal display that can eliminate motion image blurring, liquid crystal display that especially can elimination of level direction motion image blurring.When the direction of motion of image taking level when main, basicly stable in the vertical direction, human eye will see that details, by the complete picture rich in detail presenting, can not produce sense of fatigue.Except specified otherwise, " level " in literary composition refers to the direction of line scan of video, and " vertically " is the field scan direction of video.
Such as Security Inspection Equipments, food inspection equipment, film titler, dynamically information dissemination screen etc. is widely applied in example, image only motion in the horizontal direction conventionally, and moving image viewing area in screen vertical direction is pre-determined.In the layout of screen, conventionally there is the still image viewing areas such as menu bar, therefore, the height of moving image viewing area is slightly smaller than screen overall height, and, in moving image viewing area, exist an observer to pay close attention to position, this position accounts for the ratio of screen overall height conventionally in 1/2.It is clear and without the display effect of ghost that the utility model institute extracting method ensures that observer has while observing the moving image of paying close attention to position, though guarantee that the moving image at other positions in moving image viewing area is slightly with ghost but clear and legible equally, the still image viewing areas such as menu bar keep original clear display effect constant simultaneously.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 utility model, 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, it is characterized in that, backlight control module wherein comprises delay circuit, stretch circuit, three major parts of power driving circuit.Field system chronizing impulse in vision signal connects delay circuit, postpones T
delaytime, the stretch circuit broadening being then connected with delay circuit is again that width is T
onbacklight lightening pulse.Power driving circuit is connected with stretch circuit, lights 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 increasing or reduce T
onimprove or reduce the brightness of liquid crystal panel backlight; Also can introduce power driving circuit, by controlling T
onin time, export to the instantaneous power of liquid crystal panel backlight and adjust brightness.
A kind of liquid crystal display that can eliminate motion image blurring of the present utility model, wherein, delay circuit is made up of the first monostable unit D1-A and periphery capacitance resistance ware, and the field system chronizing impulse VSYNC that the first monostable unit D1-A is transfused to triggers, and the generation duration is T
delaylow level pulse LEDDLY.Regulating resistance R2 can regulate T
delaywidth.Stretch circuit is made up of the second monostable unit D1-B and periphery capacitance resistance ware, and the second monostable unit D1-B is triggered by the rising edge of low level pulse LEDDLY, and the generation duration is T
onlow level pulse LEDLIT.Regulating resistance R4 can regulate T
onwidth.Power driving circuit is made up of operational amplifier D2-A, triode V1, V2 etc.Under the effect of the feedback loop forming in operational amplifier D2-A, triode V2, resistance R 9 etc., the inverting input of operational amplifier D2-A, the voltage at resistance R 9 two ends will equal the voltage of 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, the brightness that brightness control signal derives from panel increases, subtracts 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 utility model, its advantage is with effect: compared with common liquid crystal display, the time that liquid crystal panel backlight described in the utility model is lighted only has the T of regular display
on∕ T
vsync, therefore the instantaneous power of liquid crystal panel backlight (11) need be promoted to the T of regular display
vsync∕ T
ondoubly, can allow human eye feel that the brightness of screen is suitable with regular display.But the average power of liquid crystal panel backlight does not increase, therefore do not need extra heat dissipation design, simple in structure.And form all luminous components of liquid crystal panel backlight and remain that entirety is lighted, entirety is extinguished, do not need as the scanning technique backlight of routine, be divided into many groups and controlled respectively.In sum, there is not obvious technical difficulty in liquid crystal display described in the utility model, have significant economy in the time of specific implementation.
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 utility model
Figure 4 shows that the backlight control module circuit diagram of display of the present utility model
In figure, concrete label is as follows:
1, moving image viewing area 2, still image viewing area
3, screen overall 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
Embodiment
Below in conjunction with Fig. 1-4 and embodiment, the technical solution of the utility model is described further.
As everyone knows, conventional liquid crystal display is mainly made up of several parts such as liquid crystal panel and backlight, driver module, backlight control module, key panel, power supplys.The utility model only needs backlight control module wherein to re-start design, and does not need to change other parts, can reach the object of elimination of level direction motion image blurring.Its ultimate principle is: backlight control module lags behind each field system chronizing impulse 5 in the vision signal receiving a period of time and (is designated as T
delay) after, trigger a backlight lightening pulse 6, allow backlightly (be designated as T a field duration
vsync) in only light the very short time and (be designated as T
on), as shown in Figure 2, be the sequential relationship between field system chronizing impulse 5 and backlight lightening pulse 6.Obviously, the ratio of each field picture displaying time only has T
on∕ T
vsyncif this value is enough little, between the image of opposite field, will there be enough intervals interlunation, what human eye was seen will be the unambiguous picture rich in detail of milli.If it is comparable to insert technology with aforementioned blank screen, T
vsync∕ T
onits field frequency frequency of equivalence, the T that this method is used conventionally
onbe about T
vsync1/8 of value, therefore the field frequency frequency of equivalence is 8, avoiding the effect of motion image blurring to be significantly better than field frequency frequency is 2 or 4 blank screen insertion technology.T
vsyncbe the inverse of field frequency, the physilogical characteristics of human eye require field frequency can avoid just now flickering, therefore T higher than 70Hz
vsyncconventionally should be in 14ms.
In fact, in the utility model, what human eye was seen is backlight lightening pulse liquid crystal panel significant instant status, now in certain certain width region of screen vertical direction, there is the change of new field picture replace old one field picture, if image is kept in motion, that is to say that new and old image is different in this change region, human eye will be seen the ghost of old image.Obviously, adjust T
delaycan adjust in the vertical direction the position in image change region, make it cover still image viewing area 2, and as far as possible away from paying close attention to region 4.If definition of T
altfor certain pixel of liquid crystal panel completes change required time, the ratio that image change region occupies screen overall height 3 is (T
alt+ T
on-T
blank) ∕ (T
vsync-T
blank), wherein T
blankfor vertical blanking time, be about T
vsync1/20.Common liquid crystal panel T
alt∕ T
vsyncbe about 1/6～1/3, if T
on∕ T
vsyncbe 1/8, image change region accounts for 25%～43% of screen height 3, and all the other 57%～75% parts of screen are completely enough for paying close attention to the demonstration in region 4.Obviously the response speed that, improves liquid crystal panel (shortens pixel change time T
alt), shorten backlight lightening time T
on, be all conducive to pay close attention to the expansion in region 4.Under current technical conditions, really exist the region that partly alternates to fall into the possibility of moving image viewing area 1, now observer studs with slight ghost by seeing in the position contrary with image working direction.Pay close attention to outside region 4 but ghost appears at, and ghost and image remain certain distance, therefore can't make human eye produce fuzzy and sense of fatigue.For a concrete application example, adjust T according to the actual conditions of this application example
delayafter, in routine use, do not need T
delayadjust again.
A kind of liquid crystal display that can eliminate motion image blurring of the present utility model, as shown in Figure 3, it comprises delay circuit 7, stretch circuit 8,9 three major parts of power driving circuit to its backlight control module theory diagram.Field system chronizing impulse 5 in vision signal is sent in delay circuit 7, postpones T
delaytime is then that width is T by stretch circuit 8 broadenings again
onbacklight 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 the brightness control signal 10 of display key panel for adjusting the brightness of liquid crystal panel backlight 11.According to the difference of adjusting principle, this brightness control signal 10 both can have been introduced stretch circuit 8, by increasing or reduce T
onimprove or reduce the brightness of liquid crystal panel backlight 11; Also can introduce power driving circuit 9, by controlling T
onin time, export to the instantaneous power of liquid crystal panel backlight 11 and adjust brightness.
For further understanding the concrete methods of realizing of the related backlight control module of the utility model, circuit diagram that can be shown in Figure 4.The first monostable unit D1-A and periphery capacitance resistance ware form the field system chronizing impulse VSYNC triggering that delay circuit 7, the first monostable unit D1-A are transfused to, and the generation duration is T
delaylow level pulse LEDDLY.Regulating resistance R2 can regulate T
delaywidth.The second monostable unit D1-B and periphery capacitance resistance ware form stretch circuit 8, the second monostable unit D1-B to be triggered by the rising edge of low level pulse LEDDLY, and the generation duration is T
onlow level pulse LEDLIT.Regulating resistance R4 can regulate T
onwidth.Operational amplifier D2-A, triode V1, V2 etc. form power driving circuit 9.Under the effect of the feedback loop forming in operational amplifier D2-A, triode V2, resistance R 9 etc., the inverting input of operational amplifier D2-A, the voltage at resistance R 9 two ends will equal the voltage of in-phase input end of operational amplifier D2-A.Therefore, in the time that LEDLIT is low 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, and the collector of triode V2 to emitter has larger electric current to flow through, and backlight 11 is lit.In the time that LEDLIT is high level, triode V1 conducting, the in-phase input end voltage of operational amplifier D2-A is almost 0, and the pressure drop in resistance R 9 is also bordering on 0, triode V2 cut-off, backlight 11 extinguishes.Wherein, resistance R 4 and resistance R 7 can be used the push button digital regulation resistance with power failure memory function.The brightness that brightness control signal 10 derives from panel increases, subtracts 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.In the time that the resistance of resistance R 4 increases, T
onwidth will increase, thereby the time lengthening that backlight 11 is lighted, human eye perceives brightness increase.In the time that a point voltage contact position for resistance R 7 moves up, the voltage of the in-phase input end of operational amplifier D2-A raises, and the electric current that flows through backlight 11 increases, and makes equally brightness increase.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420022414.XU CN203706641U (en) | 2014-01-14 | 2014-01-14 | Liquid crystal display capable of eliminating moving image blurring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420022414.XU CN203706641U (en) | 2014-01-14 | 2014-01-14 | Liquid crystal display capable of eliminating moving image blurring |
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| CN203706641U true CN203706641U (en) | 2014-07-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700350A (en) * | 2014-01-14 | 2014-04-02 | 北京中盾安民分析技术有限公司 | Liquid crystal display capable of eliminating motion image blurring |
| CN112150975A (en) * | 2019-06-26 | 2020-12-29 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
-
2014
- 2014-01-14 CN CN201420022414.XU patent/CN203706641U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103700350A (en) * | 2014-01-14 | 2014-04-02 | 北京中盾安民分析技术有限公司 | Liquid crystal display capable of eliminating motion image blurring |
| CN103700350B (en) * | 2014-01-14 | 2016-05-11 | 北京中盾安民分析技术有限公司 | A kind of liquid crystal display that can eliminate motion image blurring |
| CN112150975A (en) * | 2019-06-26 | 2020-12-29 | 京东方科技集团股份有限公司 | Display device and driving method thereof |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140709 Termination date: 20170114 |
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| CF01 | Termination of patent right due to non-payment of annual fee |