CN105374329A - Red-pink tailing display control method of liquid crystal display device and liquid crystal display device - Google Patents
Red-pink tailing display control method of liquid crystal display device and liquid crystal display device Download PDFInfo
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- CN105374329A CN105374329A CN201510780836.2A CN201510780836A CN105374329A CN 105374329 A CN105374329 A CN 105374329A CN 201510780836 A CN201510780836 A CN 201510780836A CN 105374329 A CN105374329 A CN 105374329A
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- liquid crystal
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
Abstract
The invention discloses a red-pink tailing display control method of a liquid crystal display device. The liquid crystal display device comprises a liquid crystal display panel and a backlight plate. The liquid crystal panel comprises a master control unit. The backlight plate comprises an illuminating unit and a backlight drive circuit. Steps include: allowing a master control unit to output a backlight dimming control signal that comprises a backlight dimming control frequency; allowing the backlight drive circuit to output at least one dimming control signal according to the dimming control frequency in the backlight dimming control signal output by the master control unit, and periodically control on and off of the illuminating unit according to the dimming control signal, wherein the frequency of the dimming control signal is asynchronous with that of the liquid crystal panel scanning a screen. The invention also discloses a display control device of the liquid crystal display device. The tailing is improved, thus improving the display quality and effect of the liquid crystal panel.
Description
Technical field
The present invention relates to technical field of liquid crystal display, particularly relate to display control method and liquid crystal indicator that liquid crystal indicator rouge and powder drags look.
Background technology
Along with the development of lcd technology and consumption market are to the high request of liquid crystal display product display image quality, derive high colour gamut lcd technology.In the technical scheme realizing high colour gamut, adopt blue chip+new rouge and powder (K2SiF6+Mn
4+) be effectively promote liquid crystal display colour gamut, cost increases less a kind of scheme simultaneously.For new rouge and powder high colour gamut lcd technology, because it has high color gamut characteristics, color representation is outstanding, and application has cost advantage in lcd technology, and existing partial liquid crystal flat pannel display manufacturer introduces and produces.
But due in new rouge and powder high colour gamut LED, phosphor constituents is K2SiF6 ground state and Mn4
+activated state chemicals, wherein Mn
4+response time be greater than 10ms, relative to the nanosecond response of blue chip and common YAG powder, Mn
4+response can there is a delay.That is, LED, when performing switch motion, can produce red twilight sunset.At present, for the liquid crystal display of high-order image quality, motion picture compensate function of arranging in pairs or groups, realizes super clear ultra-fine greasy motion picture.Motion picture compensation technique, can control backlight and carry out light modulation flicker by certain frequency, namely there is switching mode in backlight LED, and the red twilight sunset that the operating lag due to Mn4+ causes acts in motion picture to produce drags look phenomenon, affects image quality effect.
Foregoing, only for auxiliary understanding technical scheme of the present invention, does not represent and admits that foregoing is prior art.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of liquid crystal indicator rouge and powder to drag display control method and the liquid crystal indicator of look, be intended to solve at present in motion picture compensation technique, backlight can be controlled and carry out light modulation flicker by certain frequency, namely there is switching mode in backlight LED, the red twilight sunset caused due to the operating lag of Mn4+ acts in motion picture to produce drags look phenomenon, affects the problem of image quality effect.
For achieving the above object, a kind of liquid crystal indicator rouge and powder provided by the invention drags the display control method of look, described liquid crystal indicator comprises liquid crystal panel and backlight, described liquid crystal panel comprises main control unit, described backlight comprises luminescence unit and backlight drive circuit, and described liquid crystal indicator rouge and powder drags the display control method of look to comprise step:
Main control unit exports backlight dimming control signal, and described backlight dimming control signal comprises backlight dimming controlled frequency;
At least one dimming control signal of brightness adjustment control rate-adaptive pacemaker in the backlight dimming control signal that backlight drive circuit exports according to described main control unit, periodically controls luminescence unit luminescence, extinguishing according to described dimming control signal;
Wherein, the frequency of described dimming control signal is asynchronous with the frequency of liquid crystal panel scanning screen.
Preferably, the frequency of described dimming control signal is greater than the frequency of described liquid crystal panel scanning screen.
Preferably, the difference of the frequency of described dimming control signal and the frequency of described liquid crystal panel scanning screen is greater than predeterminated frequency threshold value, and described predeterminated frequency threshold value is 24KHz.
Preferably, the frequency of described dimming control signal is not the integral multiple of the frequency of described liquid crystal panel scanning screen.
Preferably, described liquid crystal indicator display control method, also comprises step:
Described main control unit exports the cyclic control signal of dim signal;
Described backlight drive circuit adjusts the action period of described dimming control signal according to the cyclic control signal that described main control unit exports, to control brightness during luminescence unit luminescence.
Preferably, described liquid crystal indicator display control method, also comprises step:
When exporting two or more dimming control signal, described main control unit exports light modulation phase control signal, to make each dimming control signal according to luminous, the extinguishing in turn of different sequential control luminescence units.
In addition, for achieving the above object, the present invention also provides a kind of and controls the liquid crystal indicator that rouge and powder drags look, comprising:
Display panels, comprises the main control unit for exporting backlight dimming control signal, and described backlight dimming control signal comprises backlight dimming controlled frequency;
Backlight, comprises luminescence unit and backlight drive circuit;
Described backlight drive circuit is used at least one dimming control signal of brightness adjustment control rate-adaptive pacemaker in the backlight dimming control signal exported according to described main control unit, periodically controls the luminescence of described luminescence unit according to described dimming control signal, extinguishes;
Wherein, the frequency of described dimming control signal is asynchronous with the frequency of liquid crystal panel scanning screen.
Preferably, the frequency of described dimming control signal is greater than the frequency of described liquid crystal panel scanning screen.
Preferably, the difference of the frequency of described dimming control signal and the frequency of described liquid crystal panel scanning screen is greater than predeterminated frequency threshold value, and described predeterminated frequency threshold value is 24KHz.
Preferably, the frequency of described dimming control signal is not the integral multiple of the frequency of described liquid crystal panel scanning screen.
The present invention is by asynchronous with liquid crystal panel scanning frequency by light modulating frequency, namely the light modulation phase place of backlight is asynchronous with the rotatable phase of liquid crystal molecule, the afterglow effect of new rouge and powder is for liquid crystal molecule swing circle, and the time point that it occurs within each cycle is change.Effectively avoid at present in motion picture compensation technique, backlight can be controlled and carry out light modulation flicker by certain frequency, namely there is switching mode in backlight LED, and the red twilight sunset that the operating lag due to Mn4+ causes acts in motion picture to produce drags look phenomenon, affects the problem of image quality effect.Improve red twilight sunset that the operating lag due to Mn4+ causes to act in motion picture to produce and drag look phenomenon, and then improve the image quality effect of liquid crystal panel display.
Accompanying drawing explanation
Fig. 1 is the configuration diagram that the present invention controls that rouge and powder drags the liquid crystal indicator preferred embodiment of look;
Fig. 2 is that under the normal bright pattern of backlight, motion switches both sides curve synoptic diagram;
Fig. 3 is the schematic diagram occurring smear under backlight carries out bright shadow optical mode;
Fig. 4 is the brightness curve schematic diagram that smear appears in new rouge and powder LED;
Fig. 5 is that traditional backlight dimming frequency and OpenCell sweep frequency design single pixel time diagram;
Fig. 6 is RGB brightness change curve schematic diagram during traditional backlight and OpenCell sweep frequency design;
Fig. 7 is that backlight dimming frequency of the present invention and OpenCell sweep frequency design single pixel time diagram;
Fig. 8 is RGB brightness change curve schematic diagram during backlight of the present invention and OpenCell sweep frequency design;
Fig. 9 is the high-level schematic functional block diagram that liquid crystal indicator rouge and powder of the present invention drags the first embodiment of the display control method of look;
Figure 10 is the high-level schematic functional block diagram of the second embodiment of liquid crystal indicator display control method of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The primary solutions of the embodiment of the present invention is: main control unit exports backlight dimming control signal, and described backlight dimming control signal comprises backlight dimming controlled frequency; At least one dimming control signal of brightness adjustment control rate-adaptive pacemaker in the backlight dimming control signal that backlight drive circuit exports according to described main control unit, periodically controls luminescence unit luminescence, extinguishing according to described dimming control signal; Wherein, the frequency of described dimming control signal is asynchronous with the frequency of liquid crystal panel scanning screen.By light modulating frequency is asynchronous with liquid crystal panel scanning frequency, namely the light modulation phase place of backlight is asynchronous with the rotatable phase of liquid crystal molecule, the afterglow effect of new rouge and powder is for liquid crystal molecule swing circle, and the time point that it occurs within each cycle is change.Effectively avoid at present in motion picture compensation technique, backlight can be controlled and carry out light modulation flicker by certain frequency, namely there is switching mode in backlight LED, and the red twilight sunset that the operating lag due to Mn4+ causes acts in motion picture to produce drags look phenomenon, affects the problem of image quality effect.Improve red twilight sunset that the operating lag due to Mn4+ causes to act in motion picture to produce and drag look phenomenon, and then improve the image quality effect of liquid crystal panel display.
Due at present in motion picture compensation technique, backlight can be controlled and carry out light modulation flicker by certain frequency, namely there is switching mode in backlight LED, and the red twilight sunset that the operating lag due to Mn4+ causes acts in motion picture to produce drags look phenomenon, affects the problem of image quality effect.
Based on the problems referred to above, the present invention further provides and a kind ofly control the liquid crystal indicator that rouge and powder drags look.
Reference Fig. 1, Fig. 1 are the configuration diagram that the present invention controls that rouge and powder drags an embodiment of the liquid crystal indicator of look.
Described control rouge and powder drags the liquid crystal indicator of look to comprise liquid crystal panel and backlight, the array base palte 100 of described display panels is placed with the pixel cell 110 of the capable y row of x.Described backlight comprises multi-group light-emitting unit 210, and each group luminescence unit 210 corresponds to the several rows pixel cell 110 of array base palte 100.In addition, display panels also comprises timing control unit 120, scan drive cell 130, data drive unit 140 and the panel drive circuit such as main control unit 150 as MCU processor; Backlight also comprises the backlight drive circuit 220 be electrically connected with luminescence unit 210.Wherein:
The input end of timing control unit 120 is electrically connected with main control unit 150, output terminal is electrically connected with scan drive cell 130, data drive unit 140 and backlight drive circuit 220, in order to receive the control signal that main control unit 150 sends, and export picture refreshing signal S according to control signal
syncto scan drive cell 130, data drive unit 140 and backlight drive circuit 220, to coordinate each circuit unit synchronous working, liquid crystal molecule is driven to rotate the picture refreshing liquid crystal panel screen.
Scan drive cell 130 receives picture refreshing signal S
sync, and export sweep signal S according to sequential
scan1 to S
scanm, opens the on-off element of the capable pixel cell 110 of 1 to m from top to bottom line by line.
Data drive unit 140 receives picture refreshing signal S
sync, and scan drive cell 130 open 1 to m capable in certain a line pixel cell 110 time, will the data-signal S of image information be loaded with
data1 to S
datathe pixel cell 110 that n write is corresponding.Backlight driving unit 220 is not only electrically connected with timing control unit 120, receives picture refreshing signal S
sync, but also be electrically connected with main control unit 150, receive the cycle control signal S that main control unit 150 sends
dutywith frequency control signal S
f, and according to the cycle control signal S received
dutywith frequency control signal S
fexport dimming control signal S
dim1 to S
dimn, works for periodically sequentially driving luminescence unit 210.Wherein, cycle control signal S
dutyfor controlling the S of dimming control signal
dim1 to S
dimthe action period of n, frequency control signal S
ffor controlling dimming control signal S
dim1 to S
dimthe output frequency of n, i.e. backlight dimming frequency.
Main control unit 150 exports backlight dimming control signal, and described backlight dimming control signal comprises backlight dimming controlled frequency;
In the present embodiment, based on user to the start-up command of electronic terminal product after, after unlocking electronic end product, receive signal of video signal, show image corresponding to described signal of video signal according to described signal of video signal by the liquid crystal panel of described electronic terminal product.Show in the process of described image at described liquid crystal panel, main control unit 150 exports backlight dimming control signal, and described backlight dimming control signal comprises backlight dimming controlled frequency.Described electronic terminal product comprises the electronic terminal product that mobile phone, pad or notebook computer etc. have display panels.Described backlight dimming control signal is exported to the backlight drive circuit 220 be connected electrically by described main control unit 150.
At least one dimming control signal of brightness adjustment control rate-adaptive pacemaker in the backlight dimming control signal that described backlight drive circuit 220 exports according to described main control unit 150, periodically controls luminescence unit luminescence, extinguishing according to described dimming control signal;
Wherein, the frequency of described dimming control signal is asynchronous with the frequency of liquid crystal panel scanning screen.
Described backlight drive circuit 220 receives the backlight dimming control signal that described main control unit 150 exports, after receiving described backlight dimming control signal, according at least one dimming control signal of brightness adjustment control rate-adaptive pacemaker in the backlight dimming control signal that described main control unit 150 exports, periodically control luminescence unit 210 luminescence according to described dimming control signal, extinguish; Wherein, the frequency of described dimming control signal is asynchronous with the frequency of liquid crystal panel scanning screen, drags look to avoid the rouge and powder of liquid crystal indicator.Namely, such as, the frequency of dimming control signal is A, the frequency of liquid crystal panel scanning screen is B, A ≠ N*B (N=1,2,3 ...), by adjusting the frequency of dimming control signal, carry new rouge and powder high colour gamut technology and movement motion compensation function, corresponding single pixel sequential, because backlight dimming frequency is asynchronous with liquid crystal panel scanning frequency, namely the light modulation phase place of backlight is asynchronous with the rotatable phase of liquid crystal molecule, and the afterglow effect of new rouge and powder rotates for liquid crystal molecule, and the time point that it occurs within each cycle is change.
Preferably, the frequency of described dimming control signal is greater than the frequency of described liquid crystal panel scanning screen.When the frequency of described dimming control signal is not the multiple of the frequency of described liquid crystal panel scanning screen, twilight sunset effect can be improved, when the frequency of described dimming control signal is greater than the frequency of described liquid crystal panel scanning screen, twilight sunset effect can better be improved.
Further, the difference of the frequency of described dimming control signal and the frequency of described liquid crystal panel scanning screen is greater than predeterminated frequency threshold value.Described predeterminated frequency threshold value is preferably 24KHz, when the difference of the frequency of described dimming control signal and the frequency of described liquid crystal panel scanning screen is greater than 24KHz, can further improve twilight sunset effect.In other embodiments of the present invention, described predeterminated frequency threshold value can also be the frequency values being greater than 24KHz, and the performance according to user's request or electronic terminal product is arranged, and when not arranging, described predeterminated frequency threshold value is 24KHz.
Further, the frequency of described dimming control signal is not the integral multiple of the frequency of described liquid crystal scanning screen.By controlling the integral multiple that the frequency of dimming control signal is not the frequency of described liquid crystal scanning screen, improving further and controlling the problem that rouge and powder drags look.
The present embodiment is by asynchronous with liquid crystal panel scanning frequency by light modulating frequency, namely the light modulation phase place of backlight is asynchronous with the rotatable phase of liquid crystal molecule, the afterglow effect of new rouge and powder is for liquid crystal molecule swing circle, and the time point that it occurs within each cycle is change.Effectively avoid at present in motion picture compensation technique, backlight can be controlled and carry out light modulation flicker by certain frequency, namely there is switching mode in backlight LED, and the red twilight sunset that the operating lag due to Mn4+ causes acts in motion picture to produce drags look phenomenon, affects the problem of image quality effect.Improve red twilight sunset that the operating lag due to Mn4+ causes to act in motion picture to produce and drag look phenomenon, and then improve the image quality effect of liquid crystal panel display.
Further, described main control unit 150 exports the cyclic control signal of dim signal;
Described backlight drive circuit 220 adjusts the action period of described dimming control signal according to the cyclic control signal that described main control unit 150 exports, to control brightness during luminescence unit 210 luminescence.
In the present embodiment, described main control unit 150 is when exporting backlight dimming control signal, export the cyclic control signal of dim signal, described cyclic control signal is for controlling the action period of described dimming control signal, described cyclic control signal comprises the periodically control time, that is, the action period of described dimming control signal is controlled according to the described periodicity control time.Cyclic control signal is sent to the backlight drive circuit 220 be connected electrically by described main control unit 150, described backlight drive circuit 220 receives the cyclic control signal that described main control unit exports, described backlight drive circuit 220 adjusts the action period of described dimming control signal according to the cyclic control signal that described main control unit exports, to control brightness during luminescence unit luminescence.
In an embodiment of the present invention, when exporting two or more dimming control signal, described main control unit 150 exports light modulation phase control signal, to make each dimming control signal according to luminous, the extinguishing in turn of different sequential control luminescence units 210.Controlled the lighting timings of luminescence unit 210 by light modulation phase control signal, thus more effectively control the display of liquid crystal panel.
The present embodiment sends cyclic control signal by main control unit 150 and is sent to backlight driving unit 220 periodically to adjust the action period of described dimming control signal, to control brightness during luminescence unit 210 luminescence.Make, while solution twilight sunset drags the problem of look, better to be controlled the display effect of liquid crystal panel by the brightness controlling luminescence unit 210.
Based on the embodiment of above-mentioned liquid crystal indicator display and control, the effect from the following process prescription embodiment of the present invention reaches:
Fig. 2 is under the normal bright pattern of backlight, and motion switches measurement curve map.Supposing that brightness is changed to Y function curvature is k-factor, and changed factor is time t, then brightness change function
---formula 1; Wherein, T is the whole period of change time.For the brightness change corresponding to formula 1, due in one-period T, its luminance function Y1 (t) is that the curve namely produced is level and smooth, embodies in liquid crystal display, and image quality is clearly separately by K1 Effects of Factors.
Fig. 3 is backlight when carrying out bright shadow optical mode, blue chip in white light LEDs, green and red fluorescence powder sync response sequential.Due to the afterglow effect of new rouge and powder, sequential response can produce hysteresis phenomenon, application there will be red smear problem.
Fig. 4 is the brightness change curve that red smear appears in new rouge and powder LED; At backlight turn-off transient, blue chip and green emitting phosphor react rapidly with nanoscale response speed, and new rouge and powder is because the response time is for being greater than 10ms, response can be caused above with both are inconsistent, can obviously observe from figure, blue and green brightness declines, but red luma still keeps.This phenomenon is reacted in liquid crystal display, namely can produce red smear.
Because backlight enters the light-modulating mode of bright dark switching, and be subject to the delayed response effect of new rouge and powder, brightness change function changes.Interval for 0≤t≤T/2, brightness change function
---formula 2;
Interval for T/2 < t≤T, brightness change function Y3=Y4+Y5---formula 3; Wherein
---formula 4,
---formula 5, by formula is
Interval for whole cycle T, brightness change function
---formula 6;
For formula 1 and formula 6, by Y1 (0)=Y6 (0), Y1 (T)=Y6 (T), K1=K2+K4+K5---formula 7 can be obtained;
Fig. 5 is that traditional backlight dimming frequency and OpenCell (liquid crystal panel) sweep frequency design, A=N*B (N=1,2,3 ...), carry new rouge and powder high colour gamut technology and movement motion compensation function, corresponding single pixel sequential chart.Because backlight dimming phase place is synchronous with liquid crystal molecule rotatable phase, the afterglow effect of new rouge and powder is for liquid crystal molecule swing circle, and the time point that it occurs within each cycle is fixing.
Fig. 6 is that traditional backlight and OpenCell sweep frequency design, carry new rouge and powder high colour gamut technology and movement motion compensation function, use MPRT instrument test motion picture handoff procedure, the RGB brightness change curve (S>20) that a single pixel S cycle integrated is average.Because the generation of new rouge and powder afterglow effect is all stationary phase for liquid crystal swing circle, S periodic brightness can be obtained by formula 0 and formula 6 and change function
Namely can be obtained by formula 8, brightness change curve changes in time, and by K2, K3, K4 tri-Effects of Factors, change curve does not seamlessly transit.Obviously can observe RGB three primary colors and there is flex point from the integrated curve that MPRT measures, and R and GB curve departs from, this for generation liquid crystal display drag chromogen because of.
Fig. 7 is that novel backlight dimming frequency and OpenCell sweep frequency design, A>B+24HZ, and A ≠ N*B (N=1,2,3 ...), carry new rouge and powder high colour gamut technology and movement motion compensation function, corresponding single pixel sequential chart.Because novel backlight light modulating frequency is asynchronous with OpenCell sweep frequency, namely the light modulation phase place of backlight is asynchronous with the rotatable phase of liquid crystal molecule; The afterglow effect of new rouge and powder is for liquid crystal molecule swing circle, and the time point that it occurs within each cycle is change.
Fig. 8 is that novel backlight dimming frequency and OpenCell sweep frequency design, carry new rouge and powder high colour gamut technology and movement motion compensation function, use MPRT instrument test motion picture handoff procedure, the RGB brightness change curve (S>20) that a single pixel S cycle integrated is average.Due in each liquid crystal molecule swing circle, the afterglow effect generation time point of new rouge and powder is all randomness.For the integration in S cycle, because afterglow effect produces the not stationarity of relative phase, by formula 0 and formula 6, then according to discrete superposition principle, the brightness change function in a feasible S cycle
Can be obtained by formula 9 and formula 7
Can be obtained by formula 10, brightness change curve changes in time, and only by K1 Effects of Factors, namely the brightness curve of whole integration can be relative smooth transition; What namely afterglow effect produced drags look phenomenon to be dispersed on each phase point, shows from liquid crystal display, also namely drags look phenomenon to be desalinated, human eye None-identified.Obviously can observe RGB three primary colors and there is not flex point from the integrated curve that MPRT measures, and RGB three primary colors height of curve overlaps, and does not exist and drags look phenomenon.
Be incorporated in the liquid crystal display of new rouge and powder high colour gamut by the application of the asynchronous design that backlight dimming and OpenCell are scanned, again in conjunction with the superposition principle of liquid crystal display, realize the discrete superposition of liquid crystal display, effectively can overcome the persistence characteristic problem of new rouge and powder material itself, enable new rouge and powder LED realize high colour gamut technology and be widely used in liquid crystal display.
Based on above-mentioned liquid crystal indicator display control unit, the present invention also proposes a kind of liquid crystal indicator, and described liquid crystal indicator comprises liquid crystal indicator display control unit as above.Described liquid crystal indicator passes through the multiple of the frequency of the frequency control Cheng Buwei liquid crystal panel scanning screen of dimming control signal.Improve red twilight sunset that the operating lag due to Mn4+ causes to act in motion picture to produce and drag look phenomenon, and then improve the image quality effect of liquid crystal panel display.
The invention provides the display control method that a kind of liquid crystal indicator rouge and powder drags look.
Reference Fig. 9, Fig. 9 are the schematic flow sheet that liquid crystal indicator rouge and powder of the present invention drags the first embodiment of the display control method of look.
In one embodiment, described liquid crystal indicator rouge and powder drags the display control method of look to comprise:
Step S10, main control unit exports backlight dimming control signal, and described backlight dimming control signal comprises backlight dimming controlled frequency;
In the present embodiment, based on user to the start-up command of electronic terminal product after, after unlocking electronic end product, receive signal of video signal, show image corresponding to described signal of video signal according to described signal of video signal by the liquid crystal panel of described electronic terminal product.Show in the process of described image at described liquid crystal panel, main control unit exports backlight dimming control signal, and described backlight dimming control signal comprises backlight dimming controlled frequency.Described electronic terminal product comprises the electronic terminal product that mobile phone, pad or notebook computer etc. have display panels.Described main control unit exports described backlight dimming control signal to be connected electrically backlight drive circuit.
Step S20, at least one dimming control signal of brightness adjustment control rate-adaptive pacemaker in the backlight dimming control signal that backlight drive circuit exports according to described main control unit, periodically controls luminescence unit luminescence, extinguishing according to described dimming control signal; Wherein, the frequency of described dimming control signal is asynchronous with the frequency of liquid crystal panel scanning screen.
Described backlight drive circuit receives the backlight dimming control signal that described main control unit exports, after receiving described backlight dimming control signal, according at least one dimming control signal of brightness adjustment control rate-adaptive pacemaker in the backlight dimming control signal that described main control unit exports, periodically control luminescence unit luminescence, extinguishing according to described dimming control signal; Wherein, the frequency of described dimming control signal is asynchronous with the frequency of liquid crystal panel scanning screen, drags look to avoid the rouge and powder of liquid crystal indicator.Namely, such as, the frequency of dimming control signal is A, the frequency of liquid crystal panel scanning screen is B, A ≠ N*B (N=1,2,3 ...), by adjusting the frequency of dimming control signal, carry new rouge and powder high colour gamut technology and movement motion compensation function, corresponding single pixel sequential, because backlight dimming frequency is asynchronous with liquid crystal panel scanning frequency, namely the light modulation phase place of backlight is asynchronous with the rotatable phase of liquid crystal molecule, and the afterglow effect of new rouge and powder rotates for liquid crystal molecule, and the time point that it occurs within each cycle is change.
Preferably, the frequency of described dimming control signal is greater than the frequency of described liquid crystal panel scanning screen.When the frequency of described dimming control signal is not the multiple of the frequency of described liquid crystal panel scanning screen, twilight sunset effect can be improved, when the frequency of described dimming control signal is greater than the frequency of described liquid crystal panel scanning screen, twilight sunset effect can better be improved.
Further, the difference of the frequency of described dimming control signal and the frequency of described liquid crystal panel scanning screen is greater than predeterminated frequency threshold value.Described predeterminated frequency threshold value is preferably 24KHz, when the difference of the frequency of described dimming control signal and the frequency of described liquid crystal panel scanning screen is greater than 24KHz, can further improve twilight sunset effect.In other embodiments of the present invention, described predeterminated frequency threshold value can also be the frequency values being greater than 24KHz, and the performance according to user's request or electronic terminal product is arranged, and when not arranging, described predeterminated frequency threshold value is 24KHz.
Further, the frequency of described dimming control signal is not the integral multiple of the frequency of described liquid crystal scanning screen.By controlling the integral multiple that the frequency of dimming control signal is not the frequency of described liquid crystal scanning screen, improving further and controlling the problem that rouge and powder drags look.
The present embodiment is by asynchronous with liquid crystal panel scanning frequency by light modulating frequency, namely the light modulation phase place of backlight is asynchronous with the rotatable phase of liquid crystal molecule, the afterglow effect of new rouge and powder is for liquid crystal molecule swing circle, and the time point that it occurs within each cycle is change.Effectively avoid at present in motion picture compensation technique, backlight can be controlled and carry out light modulation flicker by certain frequency, namely there is switching mode in backlight LED, and the red twilight sunset that the operating lag due to Mn4+ causes acts in motion picture to produce drags look phenomenon, affects the problem of image quality effect.Improve red twilight sunset that the operating lag due to Mn4+ causes to act in motion picture to produce and drag look phenomenon, and then improve the image quality effect of liquid crystal panel display.
Reference Figure 10, Figure 10 are the schematic flow sheet that liquid crystal indicator rouge and powder of the present invention drags the second embodiment of the display control method of look.Drag the first embodiment of the display control method of look based on above-mentioned liquid crystal indicator rouge and powder, described method also comprises:
Step S30, described main control unit exports the cyclic control signal of dim signal;
Step S40, described backlight drive circuit adjusts the action period of described dimming control signal according to the cyclic control signal that described main control unit exports, to control brightness during luminescence unit luminescence.
In the present embodiment, described main control unit is when exporting backlight dimming control signal, export the cyclic control signal of dim signal, described cyclic control signal is for controlling the action period of described dimming control signal, described cyclic control signal comprises the periodically control time, that is, the action period of described dimming control signal is controlled according to the described periodicity control time.Described cyclic control signal is sent to the backlight drive circuit be connected electrically, described backlight drive circuit receives the cyclic control signal that described main control unit exports, described backlight drive circuit adjusts the action period of described dimming control signal according to the cyclic control signal that described main control unit exports, to control brightness during luminescence unit luminescence.
In an embodiment of the present invention, when exporting two or more dimming control signal, described main control unit exports light modulation phase control signal, to make each dimming control signal according to luminous, the extinguishing in turn of different sequential control luminescence units.Controlled the lighting timings of luminescence unit by light modulation phase control signal, thus more effectively control the display of liquid crystal panel.
The present embodiment sends cyclic control signal by main control unit and is sent to backlight driving unit periodically to adjust the action period of described dimming control signal, to control brightness during luminescence unit luminescence.Make, while solution twilight sunset drags the problem of look, better controlled the display effect of liquid crystal panel by the brightness controlling luminescence unit.
Based on the first and second embodiments of said method, the effect from the following process prescription embodiment of the present invention reaches:
Fig. 2 is under the normal bright pattern of backlight, and motion switches measurement curve map.Supposing that brightness is changed to Y function curvature is k-factor, and changed factor is time t, then brightness change function
---formula 1; Wherein, T is the whole period of change time.For the brightness change corresponding to formula 1, due in one-period T, its luminance function Y1 (t) is that the curve namely produced is level and smooth, embodies in liquid crystal display, and image quality is clearly separately by K1 Effects of Factors.
Fig. 3 is backlight when carrying out bright shadow optical mode, blue chip in white light LEDs, green and red fluorescence powder sync response sequential.Due to the afterglow effect of new rouge and powder, sequential response can produce hysteresis phenomenon, application there will be red smear problem.
Fig. 4 is the brightness change curve that red smear appears in new rouge and powder LED; At backlight turn-off transient, blue chip and green emitting phosphor react rapidly with nanoscale response speed, and new rouge and powder is because the response time is for being greater than 10ms, response can be caused above with both are inconsistent, can obviously observe from figure, blue and green brightness declines, but red luma still keeps.This phenomenon is reacted in liquid crystal display, namely can produce red smear.
Because backlight enters the light-modulating mode of bright dark switching, and be subject to the delayed response effect of new rouge and powder, brightness change function changes.Interval for 0≤t≤T/2, brightness change function
---formula 2;
Interval for T/2 < t≤T, brightness change function Y3=Y4+Y5---formula 3; Wherein
---formula 4,
---formula 5, by formula is
Interval for whole cycle T, brightness change function
---formula 6;
For formula 1 and formula 6, by Y1 (0)=Y6 (0), Y1 (T)=Y6 (T), K1=K2+K4+K5---formula 7 can be obtained;
Fig. 5 is that traditional backlight dimming frequency and OpenCell (liquid crystal panel) sweep frequency design, A=N*B (N=1,2,3 ...), carry new rouge and powder high colour gamut technology and movement motion compensation function, corresponding single pixel sequential chart.Because backlight dimming phase place is synchronous with liquid crystal molecule rotatable phase, the afterglow effect of new rouge and powder is for liquid crystal molecule swing circle, and the time point that it occurs within each cycle is fixing.
Fig. 6 is that traditional backlight and OpenCell sweep frequency design, carry new rouge and powder high colour gamut technology and movement motion compensation function, use MPRT instrument test motion picture handoff procedure, the RGB brightness change curve (S>20) that a single pixel S cycle integrated is average.Because the generation of new rouge and powder afterglow effect is all stationary phase for liquid crystal swing circle, S periodic brightness can be obtained by formula 0 and formula 6 and change function
Namely can be obtained by formula 8, brightness change curve changes in time, and by K2, K3, K4 tri-Effects of Factors, change curve does not seamlessly transit.Obviously can observe RGB three primary colors and there is flex point from the integrated curve that MPRT measures, and R and GB curve departs from, this for generation liquid crystal display drag chromogen because of.
Fig. 7 is that novel backlight dimming frequency and OpenCell sweep frequency design, A>B+24HZ, and A ≠ N*B (N=1,2,3 ...), carry new rouge and powder high colour gamut technology and movement motion compensation function, corresponding single pixel sequential chart.Because novel backlight light modulating frequency is asynchronous with OpenCell sweep frequency, namely the light modulation phase place of backlight is asynchronous with the rotatable phase of liquid crystal molecule; The afterglow effect of new rouge and powder is for liquid crystal molecule swing circle, and the time point that it occurs within each cycle is change.
Fig. 8 is that novel backlight dimming frequency and OpenCell sweep frequency design, carry new rouge and powder high colour gamut technology and movement motion compensation function, use MPRT instrument test motion picture handoff procedure, the RGB brightness change curve (S>20) that a single pixel S cycle integrated is average.Due in each liquid crystal molecule swing circle, the afterglow effect generation time point of new rouge and powder is all randomness.For the integration in S cycle, because afterglow effect produces the not stationarity of relative phase, by formula 0 and formula 6, then according to discrete superposition principle, the brightness change function in S cycle can be obtained
Can be obtained by formula 9 and formula 7
Can be obtained by formula 10, brightness change curve changes in time, and only by K1 Effects of Factors, namely the brightness curve of whole integration can be relative smooth transition; What namely afterglow effect produced drags look phenomenon to be dispersed on each phase point, shows from liquid crystal display, also namely drags look phenomenon to be desalinated, human eye None-identified.Obviously can observe RGB three primary colors and there is not flex point from the integrated curve that MPRT measures, and RGB three primary colors height of curve overlaps, and does not exist and drags look phenomenon.
Be incorporated in the liquid crystal display of new rouge and powder high colour gamut by the application of the asynchronous design that backlight dimming and OpenCell are scanned, again in conjunction with the superposition principle of liquid crystal display, realize the discrete superposition of liquid crystal display, effectively can overcome the persistence characteristic problem of new rouge and powder material itself, enable new rouge and powder LED realize high colour gamut technology and be widely used in liquid crystal display.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a liquid crystal indicator rouge and powder drags the display control method of look, described liquid crystal indicator comprises liquid crystal panel and backlight, described liquid crystal panel comprises main control unit, described backlight comprises luminescence unit and backlight drive circuit, it is characterized in that, described liquid crystal indicator rouge and powder drags the display control method of look to comprise step:
Main control unit exports backlight dimming control signal, and described backlight dimming control signal comprises backlight dimming controlled frequency;
At least one dimming control signal of brightness adjustment control rate-adaptive pacemaker in the backlight dimming control signal that backlight drive circuit exports according to described main control unit, periodically controls luminescence unit luminescence, extinguishing according to described dimming control signal;
Wherein, the frequency of described dimming control signal is asynchronous with the frequency of liquid crystal panel scanning screen.
2. liquid crystal indicator rouge and powder as claimed in claim 1 drags the display control method of look, and it is characterized in that, the frequency of described dimming control signal is greater than the frequency of described liquid crystal panel scanning screen.
3. liquid crystal indicator rouge and powder as claimed in claim 2 drags the display control method of look, it is characterized in that, the difference of the frequency of described dimming control signal and the frequency of described liquid crystal panel scanning screen is greater than predeterminated frequency threshold value, and described predeterminated frequency threshold value is 24KHz.
4. liquid crystal indicator rouge and powder as claimed in claim 3 drags the display control method of look, and it is characterized in that, the frequency of described dimming control signal is not the integral multiple of the frequency of described liquid crystal panel scanning screen.
5. the liquid crystal indicator rouge and powder as described in any one of Claims 1-4 drags the display control method of look, it is characterized in that, described liquid crystal indicator display control method, also comprises step:
Described main control unit exports the cyclic control signal of dim signal;
Described backlight drive circuit adjusts the action period of described dimming control signal according to the cyclic control signal that described main control unit exports, to control brightness during luminescence unit luminescence.
6. the liquid crystal indicator rouge and powder as described in any one of Claims 1-4 drags the display control method of look, it is characterized in that, described liquid crystal indicator display control method, also comprises step:
When exporting two or more dimming control signal, described main control unit exports light modulation phase control signal, to make each dimming control signal according to luminous, the extinguishing in turn of different sequential control luminescence units.
7. control the liquid crystal indicator that rouge and powder drags look, it is characterized in that, comprising:
Display panels, comprises the main control unit for exporting backlight dimming control signal, and described backlight dimming control signal comprises backlight dimming controlled frequency;
Backlight, comprises luminescence unit and backlight drive circuit;
Described backlight drive circuit is used at least one dimming control signal of brightness adjustment control rate-adaptive pacemaker in the backlight dimming control signal exported according to described main control unit, periodically controls the luminescence of described luminescence unit according to described dimming control signal, extinguishes;
Wherein, the frequency of described dimming control signal is asynchronous with the frequency of liquid crystal panel scanning screen.
8. control rouge and powder as claimed in claim 7 drags the liquid crystal indicator of look, and it is characterized in that, the frequency of described dimming control signal is greater than the frequency of described liquid crystal panel scanning screen.
9. control rouge and powder as claimed in claim 8 drags the liquid crystal indicator of look, and it is characterized in that, the difference of the frequency of described dimming control signal and the frequency of described liquid crystal panel scanning screen is greater than predeterminated frequency threshold value, and described predeterminated frequency threshold value is 24KHz.
10. control rouge and powder as claimed in claim 9 drags the liquid crystal indicator of look, and it is characterized in that, the frequency of described dimming control signal is not the integral multiple of the frequency of described liquid crystal panel scanning screen.
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