CN109741712A - Backlight driving method and device, display device - Google Patents
Backlight driving method and device, display device Download PDFInfo
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- CN109741712A CN109741712A CN201910238573.0A CN201910238573A CN109741712A CN 109741712 A CN109741712 A CN 109741712A CN 201910238573 A CN201910238573 A CN 201910238573A CN 109741712 A CN109741712 A CN 109741712A
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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
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Abstract
The embodiment of the present invention discloses a kind of backlight driving method and device, is related to field of display technology, for improving the refreshing frequency and backlight illumination of display device.The backlight driving method includes: to drive the liquid crystal of each row pixel in liquid crystal display panel to overturn line by line since the first row according to present frame scanning signal；After the liquid crystal of row pixel corresponding with first sub- backlight module, which is overturn, to be completed, first sub- backlight module of control shines, and according to the column sequence of each sub- backlight module, after the liquid crystal overturning of row pixel corresponding with the sub- backlight module of m-th is completed, the control sub- backlight module of m-th shines；After the liquid crystal of last line pixel in liquid crystal display panel, which is overturn, to be completed, next frame scanning signal is received；Before the liquid crystal overturning for being sequentially driven the corresponding row pixel of each sub- backlight module according to next frame scanning signal, corresponding sub- backlight module is controlled one by one and stops shining.Backlight driving method and device provided in an embodiment of the present invention are used for liquid crystal display panel.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of backlight driving methods and device, display device.
Background technique
In recent years, with augmented reality (Augmented Reality, abbreviation AR) and virtual reality (Virtual
Reality, abbreviation VR) display technology continuous development, head-mounted display apparatus is to its backlight illumination and refreshing frequency etc.
It is required that also higher and higher.
Currently, head-mounted display apparatus mostly uses liquid crystal display die set to be shown, which is generally comprised
Liquid crystal display panel and backlight module；Backlight module provides backlight to liquid crystal display panel under the driving of driving chip, so as to
Liquid crystal display panel is shown.However, being limited to the driving capability of driving chip in the related technology, set if improving wear-type and showing
Standby refreshing frequency is easy to cause the light emission luminance of backlight module to drop then leaving the backlight module luminous time for will shorten
It is low；At this point, if promote backlight illumination by way of light source working electric current improving in backlight module, and it is easy to cause wear-type
After display equipment appearance fever, power consumption promotion, reliability a series of problems, such as membrane material fold.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of backlight driving method and device, display device, suitable for being equipped with
Splice the display device of backlight module, to improve refreshing frequency, backlight illumination and the stability in use of display device simultaneously.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions:
The first aspect of the embodiment of the present invention provides a kind of backlight driving method, is applied to splicing backlight module；The splicing
Backlight module includes the N number of sub- backlight module sequentially to form a line, N >=2, wherein every sub- backlight module and liquid crystal display panel
In at least one-row pixels it is corresponding.Above-mentioned backlight driving method, comprising:
The liquid crystal of each row pixel in liquid crystal display panel is driven to turn over line by line since the first row according to present frame scanning signal
Turn；After the liquid crystal of row pixel corresponding with first sub- backlight module, which is overturn, to be completed, the sub- backlight module hair of control first
Light, and according to the column sequence of each sub- backlight module, completion is overturn in the liquid crystal of row pixel corresponding with the sub- backlight module of m-th
Afterwards, the control sub- backlight module of m-th shines, 2≤M≤N.
After the liquid crystal of last line pixel in liquid crystal display panel, which is overturn, to be completed, next frame scanning signal is received, and
Before the liquid crystal overturning according to next frame scanning signal driving row pixel corresponding with first sub- backlight module, first is controlled
A sub- backlight module stops shining, and according to the column sequence of each sub- backlight module, according to the driving of next frame scanning signal and m-th
Before the liquid crystal overturning of the corresponding row pixel of sub- backlight module, the sub- backlight module of control m-th stops shining.
Backlight driving method provided in an embodiment of the present invention drives in liquid crystal display panel according to present frame scanning signal
, can be according to the liquid crystal rollover states of each row pixel after the liquid crystal of each row pixel is begun turning from the first row, successively control is spelled
Sub- backlight module corresponding with each row pixel is connect in backlight module to shine, and in liquid crystal display panel last line pixel liquid
Crystalline substance overturning directly receives next frame scanning signal after completing, and the overturning stage of liquid crystal is corresponded into next frame, so that spelling
Connecing the sub- backlight module in part in backlight module can shine within the next frame scanning signal corresponding time, in next frame
The part picture of interior display present frame；According to the luminous order of each sub- backlight module, so in cycles, will be formed continuous
Picture show.
Therefore, using backlight driving method provided in an embodiment of the present invention to the splicing backlight module of liquid crystal display panel into
Row driving, can effectively shorten the length of each frame time, improve the refreshing frequency of liquid crystal display panel, that is, include splicing
The refreshing frequency of display device including backlight module and liquid crystal display panel；Moreover, each height back in splicing backlight module
The luminous duration of optical mode group can continue from it after the liquid crystal overturning of interior corresponding row pixel when the current frame is completed under
Before the liquid crystal overturning for corresponding to row pixel in one frame time, it is ensured that each sub- backlight module has longer luminous duration, without
The operating current for increasing light source in each sub- backlight module avoids the occurrence of fever, power consumption is promoted, a system such as membrane material fold after reliability
Column problem, to be conducive to improve overall brightness and its stability in use of the splicing backlight module in each frame time, in turn
Improve backlight illumination and stability in use comprising the display device including splicing backlight module and liquid crystal display panel.
To sum up, backlight driving method provided in an embodiment of the present invention can be improved simultaneously comprising splicing backlight module and liquid
Refreshing frequency, backlight illumination and the stability in use of display device including LCD panel.
Further, each sub- backlight module of above-mentioned splicing backlight module passes through corresponding pulse-width signal control respectively
System；Each pulse-width signal be used to control the luminous pulse of corresponding sub- backlight module according to the sub- backlight module of correspondence column sequence successively
It is formed.
Optionally, the duty ratio of above-mentioned each pulse-width signal is identical.
Optionally, above-mentioned liquid crystal display panel includes the Zuo Ziping for watching for user's left eye, and for for user
The right sub- screen of right eye viewing；The quantity N=2 of above-mentioned splicing backlight module neutron backlight module, the splicing backlight module include with
The left backlight module that Zuo Ziping is correspondingly arranged, and right backlight module corresponding with right sub- screen.Above-mentioned backlight driving method, packet
It includes: according to present frame scanning signal, left sub- screen and the liquid crystal of the corresponding row pixel of right sub- screen successively being driven to be overturn；When left son
The liquid crystal overturning for shielding corresponding row pixel is completed, and when the liquid crystal of the corresponding row pixel of right sub- screen is begun turning, controls left backlight mould
Group shines, left eye picture of the Zuo Ziping in interior display present frame when the current frame；When the liquid crystal of the corresponding row pixel of right sub- screen turns over
When turning to complete, next frame scanning signal is received, left backlight module is controlled and stops shining；After left backlight module stops shining,
It drives the liquid crystal of the corresponding row pixel of left sub- screen to begin turning, and controls right backlight module and shine, right sub- screen is in next frame time
The right eye picture of interior display present frame.
Optionally, the duty ratio of each frame frame scan signal is a%；Left backlight module and the corresponding pulsewidth of right backlight module
The duty ratio of modulated signal is b%.In the cycle T of each frame frame scan signal, to start to receive corresponding frame scan signal
At the time of be initial time, the Δ of the pulse start time the latest t of the corresponding pulse-width signal of left backlight module1=T × (1-
B%), the Δ of the pulse start time the latest t of the corresponding pulse-width signal of right backlight module2=T × [(1-a%)/2-b%].
Based on above-mentioned backlight driving method, the second aspect of the embodiment of the present invention provides a kind of backlight drive device, the back
Drive unit includes frame scan synchronization module, liquid crystal driver module and backlight drive module；Wherein, frame scan synchronization module
It is configured to receiving frame scanning signal；Liquid crystal driver module is connect with frame scan synchronization module, and liquid crystal driver module is configured to basis
The liquid crystal of each row pixel is overturn line by line since the first row in each frame frame scan signal driving liquid crystal display panel；Backlight drive
Module and liquid crystal driver module and splicing backlight module connects, wherein splice backlight module include sequentially form a line it is N number of
Sub- backlight module, N >=2, and every sub- backlight module is corresponding at least one-row pixels in the liquid crystal display panel, backlight is driven
Dynamic model block is configured to the column sequence according to each sub- backlight module in splicing backlight module, in row corresponding with the sub- backlight module of m-th
The control sub- backlight module of m-th shines after the liquid crystal overturning of pixel is completed, and according to the driving of next frame scanning signal and M
Before the liquid crystal overturning of the corresponding row pixel of a sub- backlight module, the sub- backlight module of control m-th stops shining, 2≤M≤N.
Optionally, above-mentioned backlight drive module includes that the N number of pulsewidth modulation to connect one to one with each sub- backlight module is driven
Mover circuit；Wherein, each pulsewidth modulation drive sub-circuits are configured to control correspondence under the action of corresponding pulse-width signal
The luminance of sub- backlight module.
Further, the duty ratio of the corresponding pulse-width signal of above-mentioned each pulsewidth modulation drive sub-circuits is identical.
Optionally, above-mentioned frame scan synchronization module and liquid crystal driver module integrate；Or, the synchronous mould of above-mentioned frame scan
Block, liquid crystal driver module and backlight drive module integrate.
Beneficial effect achieved by backlight drive device provided in an embodiment of the present invention is provided with above-mentioned technical proposal
The attainable beneficial effect of backlight driving method institute is identical, and this will not be repeated here.
Based on above-mentioned backlight drive device, the third aspect of the embodiment of the present invention provides a kind of display device, the display
Device includes liquid crystal display panel and the splicing backlight module for being located at liquid crystal display panel incident side；Liquid crystal display panel and spelling
The backlight drive device that backlight module is provided with above-mentioned technical proposal respectively is connect to connect.Display device provided in an embodiment of the present invention
Achieved beneficial effect, it is identical as the backlight drive device attainable beneficial effect of institute that above-mentioned technical proposal provides,
This is not repeated them here.
Detailed description of the invention
Attached drawing described herein is used to provide to further understand the embodiment of the present invention, constitutes the embodiment of the present invention
A part, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, does not constitute improper limitations of the present invention.
In the accompanying drawings:
Fig. 1 is a kind of flow diagram of backlight driving method provided in an embodiment of the present invention；
Fig. 2 is a kind of timing control figure of backlight driving method provided in an embodiment of the present invention；
Fig. 3 is another timing control figure of backlight driving method provided in an embodiment of the present invention；
Fig. 4 is another timing control figure of backlight driving method provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of splicing backlight module provided in an embodiment of the present invention；
Fig. 6 is another flow diagram of backlight driving method provided in an embodiment of the present invention；
Fig. 7 is a kind of timing control figure of backlight driving method shown in Fig. 6；
Fig. 8 is a kind of structural schematic diagram of backlight drive device provided in an embodiment of the present invention.
Appended drawing reference:
1- liquid crystal display panel, 2- splice backlight module,
The left backlight module of 21-, the right backlight module of 22-,
31- frame scan synchronization module, 32- liquid crystal driver module,
33- backlight drive module.
Specific embodiment
Backlight driving method and its device, display device that embodiment provides in order to further illustrate the present invention, are tied below
Figure of description is closed to be described in detail.
Currently, liquid crystal display die set used in wear-type display panel generally comprises liquid crystal display panel and backlight mould
Group, backlight module provides backlight to liquid crystal display panel under the driving of driving chip, so that liquid crystal display panel is shown.In order to
Prevent liquid crystal deflection from leading to user's dizziness, the display of liquid crystal display panel be unable to do without the use of black insertion technology, i.e., adjacent two
The completely black frame of a frame is inserted within frame or number frame, or control backlight module flashes light out.Based on this, spelling is can be used in above-mentioned backlight module
Binding structure, as splicing backlight module.
Above-mentioned splicing backlight module is generally made of N number of sub- backlight module sequential, for example is sequentially in line or one
Column, the positive integer that wherein N is >=2.
Optionally, liquid crystal display panel is shown that N number of sub- backlight module sequentially lines up one by the way of row driving
Column, each of which sub- backlight module can be corresponding at least one-row pixels in liquid crystal display panel.It is, by LCD display
Each row pixel in plate is considered as a column, and carries out the grouping on the column direction to each row pixel, so that a row pixel group includes
At least one-row pixels, such row pixel group and sub- backlight module correspond, and each row pixel group is aobvious in liquid crystal display panel
Show that orthographic projection of the orthographic projection in face with corresponding sub- backlight module in the liquid crystal display panel display surface is overlapped.
Optionally, liquid crystal display panel is shown that N number of sub- backlight module sequentially lines up one by the way of column driving
Row, each of which sub- backlight module can be corresponding at least column pixel in liquid crystal display panel.It is, by LCD display
Each column pixel in plate is considered as a line, and carries out the grouping on the line direction to each column pixel, so that a column pixel group includes
An at least column pixel, such column pixel group and sub- backlight module correspond, and each column pixel group is aobvious in liquid crystal display panel
Show that orthographic projection of the orthographic projection in face with corresponding sub- backlight module in the liquid crystal display panel display surface is overlapped.
Since row's pixel in liquid crystal display panel is one-row pixels or a column pixel, liquid crystal display panel is depended on
With the relative position of user, i.e. one-row pixels in user's eye, a column pixel will appear as after turning counterclockwise 90 °, so
Splicing backlight module in each sub- backlight module be sequentially be in line or one column, with respective pixel in liquid crystal display panel
Relationship be substantially identical.
Based on this, the embodiment of the invention provides a kind of backlight driving methods, are applied to above-mentioned splicing backlight module；The spelling
Each sub- backlight module connect in backlight module sequentially forms a line, and each of which sub- backlight module can in liquid crystal display panel
At least one-row pixels it is corresponding.
Please refer to Fig. 1-Fig. 4, backlight driving method provided in an embodiment of the present invention, comprising:
Step S1 drives the liquid crystal of each row pixel in liquid crystal display panel since the first row according to present frame scanning signal
It overturns line by line.
Frame display control signal of the above-mentioned frame scan signal as liquid crystal display panel is being needed to show when the current frame, connect
The frame scan signal received is present frame scanning signal corresponding with present frame；When needing to show next frame, the frame that receives
Scanning signal is next frame scanning signal corresponding with next frame.
Optionally, frame scan signal is as shown in TE signal in Fig. 2, Fig. 3 and Fig. 4, period T.In each cycle T,
When frame scan signal is low level, the liquid crystal of each row pixel in liquid crystal display panel is driven to overturn line by line since the first row；Frame
When scanning signal is high level, stop driving.
Above-mentioned frame scan signal can be divided into multiple line scan signals according to its each row pixel for corresponding to driving, to utilize
The liquid crystal of the corresponding driving at least one-row pixels of each line scan signals is overturn.
Step S2 controls first after the liquid crystal of row pixel corresponding with first sub- backlight module, which is overturn, to be completed
Sub- backlight module shines, and according to the column sequence of each sub- backlight module, in the liquid crystal of row pixel corresponding with the sub- backlight module of m-th
After overturning is completed, the control sub- backlight module of m-th shines, 2≤M≤N.
The liquid crystal overturning of certain above-mentioned one-row pixels is completed to refer to that the row pixel corresponds to the liquid crystal molecule of liquid crystal into stabilization
State.It is understood that the liquid crystal of every row pixel needs certain time from beginning turning to its tilt-stable, this is namely
It says, the overturning completion moment of the liquid crystal of every row pixel will be late by the completion moment of corresponding line scan signals.
It, can be in row picture corresponding with the sub- backlight module it should be noted that above-mentioned a certain sub- backlight module shines
The liquid crystal overturning of element carries out at once after completing, and can also overturn and complete in the liquid crystal of row pixel corresponding with the sub- backlight module
It is carried out again after a period of time later.The light-emitting period of the above-mentioned sub- backlight module of each adjacent two, can partly overlap or not weigh
It is folded.
Step S3 receives next frame scan after the liquid crystal of last line pixel in liquid crystal display panel, which is overturn, to be completed
Signal.
Within when the current frame, if the liquid crystal of each row pixel all complete by overturning in liquid crystal display panel, just
It is between indicating when the current frame, can receive next frame scanning signal, next frame time is directly entered, without every
The setting backlight luminescence period luminous dedicated for the sub- backlight module of control in one frame time.Based on this, and need in the related technology
To reserve the special backlight luminescence period in each frame time compares, and the embodiment of the present invention can effectively shorten each frame time
Duration, and then improve the refreshing frequency of corresponding display device.
Step S4 is turned over according to the liquid crystal of next frame scanning signal driving row pixel corresponding with first sub- backlight module
Before turning, the sub- backlight module of control first stops shining, and according to the column sequence of each sub- backlight module, according to next frame scan
Before signal drives the liquid crystal overturning of row pixel corresponding with the sub- backlight module of m-th, the sub- backlight module of control m-th stops hair
Light.
Before being overturn according to the liquid crystal of next frame scanning signal driving row pixel corresponding with a certain sub- backlight module,
Corresponding sub- backlight module is controlled to stop shining；When the sub- backlight module does not shine and then drives and the sub- backlight module pair
The liquid crystal for the row pixel answered is begun turning.It is understood that can be considered when a certain sub- backlight module does not shine to this
The display that sub- backlight module corresponds to row pixel carries out black plug.
Above-mentioned present frame scanning signal and next frame scanning signal belong to the frame scan signal of different cycles, and the two has phase
Same pulse structure, the division that present frame and next frame are carried out to it is intended merely to clearly illustrate variant in the embodiment of the present invention
Furthermore the execution time of step has no other and substantially limits.
Backlight driving method provided in an embodiment of the present invention drives in liquid crystal display panel according to present frame scanning signal
, can be according to the liquid crystal rollover states of each row pixel after the liquid crystal of each row pixel is begun turning from the first row, successively control is spelled
Sub- backlight module corresponding with each row pixel is connect in backlight module to shine, and in liquid crystal display panel last line pixel liquid
Crystalline substance overturning directly receives next frame scanning signal after completing, and the overturning stage of liquid crystal is corresponded into next frame, so that spelling
Connecing the sub- backlight module in part in backlight module can shine within the next frame scanning signal corresponding time, in next frame
The part picture of interior display present frame；According to the luminous order of each sub- backlight module, so in cycles, will be formed continuous
Picture show.
Therefore, using backlight driving method provided in an embodiment of the present invention to the splicing backlight module of liquid crystal display panel into
Row driving, can effectively shorten the length of each frame time, improve the refreshing frequency of liquid crystal display panel, that is, include splicing
The refreshing frequency of display device including backlight module and liquid crystal display panel；Moreover, each height back in splicing backlight module
The luminous duration of optical mode group can continue from it after the liquid crystal overturning of interior corresponding row pixel when the current frame is completed under
Before the liquid crystal overturning for corresponding to row pixel in one frame time, it is ensured that each sub- backlight module has longer luminous duration, without
The operating current for increasing light source in each sub- backlight module avoids the occurrence of fever, power consumption is promoted, a system such as membrane material fold after reliability
Column problem, to be conducive to improve overall brightness and its stability in use of the splicing backlight module in each frame time, in turn
Improve backlight illumination and stability in use comprising the display device including splicing backlight module and liquid crystal display panel.
To sum up, backlight driving method provided in an embodiment of the present invention, can improve simultaneously comprising splice sub- backlight module and
Refreshing frequency, backlight illumination and the stability in use of display device including liquid crystal display panel.
Each sub- backlight module of above-mentioned splicing backlight module is independently controlled luminous, every height back in splicing backlight module
Optical mode group is both needed to matching one pulsewidth modulation (Pulse Width Modulation, abbreviation PWM) signal of setting, so as to using respectively
Pulse-width signal controls the luminance of corresponding sub- backlight module respectively.In some embodiments of the invention, splice backlight
Each sub- backlight module of mould group passes through corresponding pulse-width signal respectively and controls, and each pulse-width signal is for controlling corresponding son
The luminous pulse of backlight module is sequentially formed according to the column sequence of the sub- backlight module of correspondence.This is that is, according to each sub- backlight mould
The column sequence of group, after first sub- backlight module is shone by control, second and later each sub- backlight module will sequentially by
Control shines.
Illustratively, splicing backlight module includes the 3 sub- backlight modules sequentially to form a line, is respectively the first son back
Optical mode group, the second sub- backlight module and the sub- backlight module of third.Wherein, each sub- backlight module can using it is as shown in Figure 2 when
Sequence control figure, i.e., the corresponding pulse-width signal of the first sub- backlight module is as shown in N1 signal in Fig. 2, the second sub- backlight module pair
The pulse-width signal answered is as shown in N2 signal in Fig. 2, N3 letter in the corresponding pulse-width signal of the sub- backlight module of third such as Fig. 2
Shown in number.When frame scan signal TE is initial frame scanning signal and to switch to low level from high level, when into period 1 T1, control
The liquid crystal overturning that the luminous high level signal of the first sub- backlight module is made in row pixel corresponding with the first sub- backlight module is completed
It issues, terminates before the liquid crystal overturning that next frame scanning signal controls the row pixel later；Control the second sub- backlight module with
And the high level signal that the sub- backlight module of third is luminous, it will successively follow according to its column sequence in the sub- backlight module hair of control first
After the high level signal of light；Then, in cycles.
It is understood that in the period 1 T1 of corresponding initial frame scanning signal, if the first sub- backlight mould of control
The luminous high level signal of group not yet issues, then to the second sub- backlight module of control and the sub- backlight module hair of third is applied to
The high level signal of light can not occur, than as shown in Figure 2.Certainly, in the period 1 T1 of corresponding initial frame scanning signal,
Even if the high level signal that the first sub- backlight module of control shines not yet issues, to applied to the second sub- backlight module of control
And the high level signal that the sub- backlight module of third shines also still can be according to the cycle period after it, in control the first son back
The luminous high level signal of optical mode group issues before issuing, than as shown in Figure 3.Wherein, the corresponding pulsewidth of the first sub- backlight module
Modulated signal is N1' signal, and the corresponding pulse-width signal of the second sub- backlight module is N2' signal, the sub- backlight module pair of third
The pulse-width signal answered is N3' signal.However, it is desirable to it is noted that in the period 1 T1 for corresponding to initial frame scanning signal
It is interior, although controlling the first sub- backlight for controlling the high level signal that the second sub- backlight module and the sub- backlight module of third shine
The luminous high level signal of mould group has been sent from before issuing, but since its liquid crystal for corresponding to row pixel is not yet overturn, so simultaneously
The display of liquid crystal display panel will not be had an impact.
In addition, the first sub- backlight module can be after a period of time that the liquid crystal of corresponding row pixel overturns after completing
It is shone by the high level signal control of pulse-width signal, than as shown in Figures 2 and 3.First sub- backlight module can also with
The liquid crystal overturning that first sub- backlight module corresponds to row pixel is controlled by the high level signal of pulse-width signal as early as possible after completing
It shines, than as shown in Figure 4, wherein the corresponding pulse-width signal of the first sub- backlight module is N1 " signal, the second sub- backlight mould
The corresponding pulse-width signal of group is N2 " signal, and the corresponding pulse-width signal of the sub- backlight module of third is N3 " signal.
It should be noted that in some embodiment of the invention, each sub- backlight module spliced in backlight module is identical, i.e.,
The splicing backlight module can be made of the identical multiple sub- backlight module sequentials of structure.Correspondingly, for controlling splicing
The luminous each pulse-width signal of each sub- backlight module can have identical duty ratio in backlight module, this is that is, each
Pulse width of the pulse-width signal within each period is identical.Corresponding sub- back is being controlled using each pulse-width signal in this way
When optical mode group shines, each sub- backlight module can be made to be respectively provided with identical luminous duration.As a result, when each sub- backlight module quilt
When sequentially control shines, just it is able to achieve variant sub- backlight module in liquid crystal display panel and corresponds to the uniform of row pixel display picture
Transition is conducive to promote frame picture display quality.
It is noted that above-mentioned backlight driving method can be applied in head-mounted display apparatus, to improve wear-type
Show the refreshing frequency and its emitting brightness and stability in use in each frame time of equipment.Fig. 5 and Fig. 6 are please referred to,
Liquid crystal display panel 1 in head-mounted display apparatus generally comprises the left sub- screen L for watching for user's left eye, and for supplying
The right sub- screen R of user's right eye viewing.Splice backlight module 2 and provides backlight to liquid crystal display panel 1, it can be according to LCD display
The quantity of 1 neutron screen of plate, using 2 sub- backlight modules, i.e., the splicing backlight module includes the left back being correspondingly arranged with Zuo Ziping L
Optical mode group 21, and right backlight module 22 corresponding with right sub- screen R.Left backlight module 21 and right backlight module 22 are as shown in Figure 5
It forms a line, wherein every one-row pixels P in left backlight module 21 and Zuo Ziping LLIt is corresponding, with each row pixel of son screen L to the left
PLBacklight is provided；Every one-row pixels P in right backlight module 22 and right sub- screen RRIt is corresponding, with each row pixel P of son screen R to the rightRIt mentions
For backlight.
When providing backlight to liquid crystal display panel 1 using the splicing backlight module 2, backlight driving method includes:
Step S1' successively drives left sub- screen L and the corresponding row pixel (P of right sub- screen R according to present frame scanning signalLWith
PR) liquid crystal overturn.
Step S2', as the corresponding row pixel P of left sub- screen LLLiquid crystal overturn and complete, the corresponding row pixel P of right sub- screen RR's
When liquid crystal is begun turning, controls left backlight module 21 and shine, left eye picture of the Zuo Ziping in interior display present frame when the current frame.
The liquid crystal molecule that the liquid crystal overturning of above-mentioned row pixel is completed to refer to that the row pixel corresponds to liquid crystal enters stable state,
The liquid crystal of every row pixel needs certain time from beginning turning to its tilt-stable.
Step S3', as the corresponding row pixel P of right sub- screen RRLiquid crystal overturn complete when, receive next frame scanning signal, control
Left backlight module 21 is made to stop shining.
Within when the current frame, if the corresponding row pixel P of right sub- screen RRLiquid crystal all overturning complete, then with regard to table
It is between showing when the current frame, can receive next frame scanning signal, be directly entered next frame time.
Step S4' drives the corresponding row pixel P of left sub- screen L after left backlight module 21 stops shiningLLiquid crystal open
Begin to overturn, and control right backlight module 22 and shine, right sub- screen R shows the right eye picture of present frame in next frame time.
According to the luminous order of above-mentioned left backlight module and right backlight module, in cycles, continuous picture will be formed
Display.
The embodiment of the present invention uses above-mentioned backlight driving method, and the liquid crystal display panel of head-mounted display device provides back
Light, can effectively shorten the length of each frame time, improve the refreshing frequency of head-mounted display apparatus.Moreover, splicing backlight mould
The luminous duration of left backlight module and right backlight module in group can be turned over from it in the liquid crystal of interior corresponding row pixel when the current frame
Turn after completing, continue to next frame time correspond to row pixel liquid crystal overturn before so that left backlight module and right backlight
Mould group has longer luminous duration, to effectively improve the emitting brightness of splicing backlight module, and then avoids using increase light
The mode of source operating current improves brightness, can prevent fever, power consumption is promoted, membrane material fold etc. is a series of after reliability
Problem is conducive to the emitting brightness improved splicing backlight module and its place head-mounted display apparatus in each frame time and makes
Use stability.
You need to add is that splicing the left backlight module 21 and right back of backlight module in above-mentioned head-mounted display apparatus
Optical mode group 22 is independently controlled luminous, and left backlight module 21 and right backlight module 22 pass through corresponding pulsewidth modulation (Pulse respectively
Width Modulation, abbreviation PWM) signal control.
In some embodiment of the invention, optionally, the timing control figure of left backlight module 21 and right backlight module 22 is such as
Shown in Fig. 7.
Wherein, frame scan signal is as shown in TE signal in Fig. 7, period T, duty ratio a%, illustrates t0And t4Moment
At the time of correspondence for TE signal failing edge, t is illustrated1Moment is middle point moment of the TE signal in the period, illustrates t3Moment is TE letter
At the time of number rising edge corresponds to.In the cycle T of each frame frame scan signal TE, when frame scan signal TE is low level, liquid crystal
Display panel starts to charge, and the liquid crystal that row pixel is corresponded in liquid crystal display panel is begun turning；Frame scan signal TE is high level
When, liquid crystal display panel stops charging, and the liquid crystal that row pixel is corresponded in liquid crystal display panel stops overturning.It should be noted that
When the low and high level of frame scan signal changes, the liquid crystal that row pixel is corresponded in liquid crystal display panel can't move at once
Make, but need regular hour difference ability respective action, which is commonly referred to as the liquid crystal response time.
The corresponding pulse-width signal of left backlight module 21 is as shown in L signal in Fig. 7, period T, duty ratio b%.
The corresponding pulse-width signal of right backlight module 22 is as shown in R signal in Fig. 7, period T, duty ratio b%.Based on above-mentioned
Each pulse-width signal makees periodic cycle, and the embodiment of the present invention only does exemplary illustration with regard to the period shown in fig. 7.It please refers to
Fig. 7 illustrates t1Moment and t6Moment is that right backlight module 22 stops the luminous moment the latest, is also the corresponding row of right backlight module 22
At the time of pixel liquid crystal is begun turning.Illustrate t2At the time of moment is that the corresponding row pixel liquid crystal overturning of left backlight module 21 is completed,
Illustrate t1Moment is to t2Time between moment is the liquid crystal response time of the corresponding row pixel liquid crystal of left backlight module 21.Illustrate t0
Moment and t4Moment is that left backlight module 21 stops the luminous moment the latest, is also opened for the corresponding row pixel liquid crystal of left backlight module 21
At the time of beginning to overturn.Illustrate t5At the time of moment is that the corresponding row pixel liquid crystal overturning of right backlight module 22 is completed, t is illustrated4Moment is extremely
t5Time between moment is the liquid crystal response time of the corresponding row pixel liquid crystal of right backlight module 22.The corresponding arteries and veins of left backlight module 21
The time t that high level signal occurs in wide modulated signalLPositioned at diagram t2Moment is to t4Between moment, i.e., left backlight module 21 can
In diagram t2Moment and t4Certain time period between moment shines.High electricity in the corresponding pulse-width signal of right backlight module 22
The time t that ordinary mail number occursRPositioned at diagram t5Moment is to t6Between moment, i.e., right backlight module 22 can be in diagram t5Moment and t6
Certain time period between moment shines.
In addition, please continue to refer to Fig. 7, in the cycle T of each frame frame scan signal TE, to start to receive corresponding frame scan
T at the time of signal0Or t4When for initial time 0, the pulse start time the latest of the corresponding pulse-width signal of left backlight module 21
Δt1(it is, high level signal allows the latest time occurred in the corresponding pulse-width signal of left backlight module 21) can adopt
It is calculated and is obtained with following formula:
Δt1=T × (1-b%).
Wherein, T is the period of frame scan signal, and b is the duty ratio of the corresponding pulse-width signal of left backlight module 21.
Please continue to refer to Fig. 7, in the cycle T of each frame frame scan signal TE, to start to receive corresponding frame scan signal
At the time of t0Or t4When for initial time 0, the Δ of the pulse start time the latest t of the corresponding pulse-width signal of right backlight module 222
(it is, high level signal allows the latest time occurred in the corresponding pulse-width signal of right backlight module 22) can be using such as
Lower formula, which calculates, to be obtained:
Δt2=T × [(1-a%)/2-b%].
Wherein, T is the period of frame scan signal, and a is the duty ratio of frame scan signal, and b is that left backlight module 21 is corresponding
The duty ratio of pulse-width signal.
The embodiment of the present invention obtains the pulse start time the latest of corresponding pulse-width signal, Ke Yiyou using above-mentioned formula
Effect balances the corresponding relationship that each backlight module shines between duration and frame scan signal, pulse-width signal, to optimize left back
The emitting brightness of optical mode group 21 and right backlight module 22, or effectively obtain the backlight module emitting brightness that can meet actual demand.
The embodiment of the invention also provides a kind of backlight drive devices, for implementing above-mentioned backlight driving method.It please refers to
Fig. 8, the backlight drive device include frame scan synchronization module 31, liquid crystal driver module 32 and backlight drive module 33.
Wherein, frame scan synchronization module 31 is configured to receiving frame scanning signal.Frame scan signal is as liquid crystal display panel
Frame display control signal, need show when the current frame, the control mainboard of liquid crystal display panel corresponding with present frame will be worked as
Previous frame scanning signal is sent to frame scan synchronization module 31；When needing to show next frame, the control mainboard of liquid crystal display panel
Next frame scanning signal corresponding with next frame is sent to frame scan synchronization module 31.
Liquid crystal driver module 32 is connect with frame scan synchronization module 31, and liquid crystal driver module 32 is configured to according to each frame frame
The liquid crystal of each row pixel is overturn line by line since the first row in scanning signal driving liquid crystal display panel.
Backlight drive module 33 is connect with liquid crystal driver module 32 and splicing backlight module, wherein splicing backlight module
Including the N number of sub- backlight module sequentially to form a line, N >=2, and every sub- backlight module and at least one in liquid crystal display panel
Row pixel is corresponding, and backlight drive module 33 is configured to the column sequence according to each sub- backlight module in splicing backlight module, with m-th
The control sub- backlight module of m-th shines after the liquid crystal overturning of the corresponding row pixel of sub- backlight module is completed, and according to next
Before frame scan signal drives the liquid crystal overturning of row pixel corresponding with the sub- backlight module of m-th, the sub- backlight module of m-th is controlled
Stop shining, 2≤M≤N.
Above-mentioned backlight drive device when in use, backlight drive side mentioned by backlight driving method and previous embodiment
Method is identical, therefore and will not be described here in detail.Beneficial effect achieved by backlight drive device provided in an embodiment of the present invention, and it is above-mentioned
The attainable beneficial effect of backlight driving method institute that embodiment provides is identical.
It is understood that above-mentioned backlight drive module 33 is used to drive each sub- backlight module in splicing backlight module only
Vertical to shine, backlight drive module 33 can be using the structure of driving chip or driving circuit.Certainly, it is not limited to that, other
The structure that above-mentioned function may be implemented is applicable in.
Illustratively, backlight drive module 33 includes that the N number of pulsewidth modulation to connect one to one with each sub- backlight module is driven
Mover circuit.Wherein, each pulsewidth modulation drive sub-circuits are configured to control correspondence under the action of corresponding pulse-width signal
The luminance of sub- backlight module；Each pulse-width signal can by liquid crystal driver module 32 and its driving signal synchronism output,
It can also be generated by each pulsewidth modulation drive sub-circuits are synchronous on the basis of 32 driving signal of liquid crystal driver module.
In some embodiment of the invention, splicing backlight module can sequentially be arranged by the identical multiple sub- backlight modules of structure
Column are constituted；Correspondingly, the corresponding pulsewidth modulation of each pulsewidth modulation drive sub-circuits for controlling sub- backlight module luminance
Signal can have identical duty ratio.Corresponding sub- backlight module is being driven to send out using each pulsewidth modulation drive sub-circuits in this way
Light time can make each sub- backlight module be respectively provided with identical luminous duration.As a result, when each sub- backlight module is sequentially controlled
When shining, just it is able to achieve variant sub- backlight module in liquid crystal display panel and corresponds to the even transition that row pixel shows picture, have
Conducive to promotion frame picture display quality.
Optionally, above-mentioned frame scan synchronization module 31 is integrated with liquid crystal driver module 32, for example is integrated in same drive
In dynamic chip, be conducive to the frame response speed for improving liquid crystal driver module 32.Certainly, above-mentioned frame scan synchronization module 31, liquid crystal
Drive module 32 can also be integrated with backlight drive module 33, for example three is integrated in same circuit board, to simplify
And the structure of compact backlight drive device, and then space hold of the backlight drive device in corresponding display device can be reduced.
The embodiment of the invention also provides a kind of display device, the display device includes liquid crystal display panel and is located at
The splicing backlight module of liquid crystal display panel incident side；Liquid crystal display panel and splicing backlight module are mentioned with above-described embodiment respectively
The backlight drive device of confession connects.Backlight drive fills in beneficial effect, with above-described embodiment achieved by the display device
Set that the attainable beneficial effect of institute is identical, and this will not be repeated here.
Display device provided by the above embodiment can for mobile phone, tablet computer, television set, display, laptop,
The products or components having a display function such as Digital Frame or navigator.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art can easily think of the change or the replacement in the technical scope that the embodiment of the present invention discloses,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of the claim
Subject to enclosing.
Claims (10)
1. a kind of backlight driving method, which is characterized in that be applied to splicing backlight module；The splicing backlight module includes sequentially
The N number of sub- backlight module to form a line, N >=2, wherein at least a line in each sub- backlight module and liquid crystal display panel
Pixel is corresponding；
The backlight driving method, comprising:
The liquid crystal of each row pixel in the liquid crystal display panel is driven to turn over line by line since the first row according to present frame scanning signal
Turn；After the liquid crystal of row pixel corresponding with first sub- backlight module, which is overturn, to be completed, first sub- backlight mould is controlled
Group shines, and according to the column sequence of each sub- backlight module, overturns and complete in the liquid crystal of row pixel corresponding with the sub- backlight module of m-th
Later, it controls the sub- backlight module of the m-th to shine, 2≤M≤N；
After the liquid crystal of last line pixel in the liquid crystal display panel, which is overturn, to be completed, next frame scanning signal is received；?
Before the liquid crystal overturning of next frame scanning signal driving row pixel corresponding with described first sub- backlight module, control
It makes described first sub- backlight module to stop shining, and according to the column sequence of each sub- backlight module, according to next frame scan
Before signal drives the liquid crystal overturning of row pixel corresponding with the sub- backlight module of the m-th, the sub- backlight mould of the m-th is controlled
Group stops shining.
2. backlight driving method according to claim 1, which is characterized in that
Each sub- backlight module passes through corresponding pulse-width signal respectively and controls；
Each pulse-width signal is used to control the luminous pulse of corresponding sub- backlight module according to the column of the sub- backlight module of correspondence
Sequence sequentially forms.
3. backlight driving method according to claim 2, which is characterized in that the duty ratio phase of each pulse-width signal
Together.
4. backlight driving method according to claim 1-3, which is characterized in that the liquid crystal display panel includes
Zuo Ziping for being watched for user's left eye, and the right sub- screen for being watched for user's right eye；The number of the sub- backlight module
Measure N=2, the splicing backlight module includes the left backlight module being correspondingly arranged with the Zuo Ziping, and with the right sub- screen
Corresponding right backlight module；
The backlight driving method, comprising:
According to the present frame scanning signal, successively drive the left sub- screen and the liquid crystal of the corresponding row pixel of the right sub- screen into
Row overturning；
It is completed when the liquid crystal of the corresponding row pixel of the left sub- screen is overturn, the liquid crystal of the corresponding row pixel of shown right sub- screen starts to turn over
When turning, controls the left backlight module and shine, left eye picture of the Zuo Ziping in interior display present frame when the current frame；
When the liquid crystal of the corresponding row pixel of the right sub- screen, which is overturn, to be completed, the next frame scanning signal is received, described in control
Left backlight module stops shining；After the left backlight module stops shining, the corresponding row pixel of the left sub- screen is driven
Liquid crystal is begun turning, and is controlled the right backlight module and shone, and the right sub- screen shows the present frame in next frame time
Right eye picture.
5. backlight driving method according to claim 4, which is characterized in that
The duty ratio of each frame frame scan signal is a%；
The duty ratio of the left backlight module and the corresponding pulse-width signal of the right backlight module is b%；
It is described as initial time at the time of to start to receive corresponding frame scan signal in the cycle T of each frame frame scan signal
The Δ of the pulse start time the latest t of the corresponding pulse-width signal of left backlight module1=T × (1-b%), the right backlight module
The Δ of the pulse start time the latest t of corresponding pulse-width signal2=T × [(1-a%)/2-b%].
6. a kind of backlight drive device characterized by comprising
Frame scan synchronization module；The frame scan synchronization module is configured to receiving frame scanning signal；
The liquid crystal driver module being connect with the frame scan synchronization module；The liquid crystal driver module is configured to according to each frame frame
The liquid crystal of each row pixel is overturn line by line since the first row in scanning signal driving liquid crystal display panel；
The backlight drive module being connect with the liquid crystal driver module and splicing backlight module；Wherein, the splicing backlight mould
Group includes the N number of sub- backlight module sequentially to form a line, N >=2, and each sub- backlight module and the liquid crystal display panel
In at least one-row pixels it is corresponding；The backlight drive module is configured to according to each sub- backlight module in the splicing backlight module
Column sequence, row pixel corresponding with the sub- backlight module of m-th liquid crystal overturning complete after control the sub- backlight mould of the m-th
Group shines, and drives the liquid crystal of row pixel corresponding with the sub- backlight module of the m-th to overturn it according to next frame scanning signal
Before, it controls the sub- backlight module of the m-th and stops shining, 2≤M≤N.
7. backlight drive device according to claim 6, which is characterized in that the backlight drive module include with it is each described
N number of pulsewidth modulation drive sub-circuits that sub- backlight module connects one to one；Wherein, each pulsewidth modulation drive sub-circuits
It is configured to the luminance of the corresponding sub- backlight module of control under the action of corresponding pulse-width signal.
8. backlight drive device according to claim 7, which is characterized in that each pulsewidth modulation drive sub-circuits are corresponding
Pulse-width signal duty ratio it is identical.
9. according to the described in any item backlight drive devices of claim 6-8, which is characterized in that
The frame scan synchronization module and the liquid crystal driver module integrate；Or,
The frame scan synchronization module, the liquid crystal driver module and the backlight drive module integrate.
10. a kind of display device, which is characterized in that including liquid crystal display panel and be located at the liquid crystal display panel incident side
Splicing backlight module；The liquid crystal display panel and the splicing backlight module respectively with any one of such as claim 6-9 institute
The backlight drive device connection stated.
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| CN201910238573.0A CN109741712A (en) | 2019-03-27 | 2019-03-27 | Backlight driving method and device, display device |
| PCT/CN2020/077023 WO2020192351A1 (en) | 2019-03-27 | 2020-02-27 | Backlight driving method and circuit, driving method and device for display, and display device |
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| CN201910238573.0A CN109741712A (en) | 2019-03-27 | 2019-03-27 | Backlight driving method and device, display device |
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