CN108335677A - Luminance compensation method, luminance compensating mechanism and display device - Google Patents
Luminance compensation method, luminance compensating mechanism and display device Download PDFInfo
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- CN108335677A CN108335677A CN201810141590.8A CN201810141590A CN108335677A CN 108335677 A CN108335677 A CN 108335677A CN 201810141590 A CN201810141590 A CN 201810141590A CN 108335677 A CN108335677 A CN 108335677A
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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
- G09G3/3406—Control of illumination source
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
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Abstract
A kind of luminance compensation method of disclosure offer, luminance compensating mechanism and display device, the backlight illumination for being applied to display panel compensate, and are related to display technology field.The luminance compensation method includes：Obtain corresponding first brightness of the preset gray scale of display pixel under the first refreshing frequency；Obtain corresponding second brightness of the preset gray scale of display pixel under the second refreshing frequency；The duty ratio of compensation pulse-width signal is obtained according to the difference of first brightness and second brightness.The disclosure can guarantee the brightness constancy under different refreshing frequencys.
Description
Technical field
This disclosure relates to a kind of display technology field more particularly to luminance compensation method, luminance compensating mechanism and display
Device.
Background technology
With the high speed development of optical technology and semiconductor technology, with LCD (Liquid Crystal Display, liquid crystal
Display) to be the flat-panel monitor of representative have that frivolous, low energy consumption, reaction speed is fast, excitation purity is good and the spies such as contrast height
Point occupies leading position in display field.
Fig. 1 shows the Organization Chart of LCD display device.The LCD display device 10 may include display panel 101, be used for
Drive the driving circuit 102 of display panel 101, the backlight module 103 for providing light source for display panel 101, for driving
The backlight driver 104 of backlight module 103 and sequence controller 105 for controlling driving circuit 102；Wherein, backlight is driven
Dynamic device 104 needs the duty ratio of the pulse-width signal PWM transmitted according to sequence controller 105 to adjust backlight module 103
Switch time, to control the light emission luminance of backlight module 103.
But when there is display panel same gray level to be but in different refreshing frequencys, such as support that Freesync is (aobvious
Show converter technique) display panel of function, the intrinsic brilliance of display panel just will appear certain difference, and be brushed under same grayscale
New frequency is inversely proportional with display brightness.If luminance difference is excessive will to influence human eye vision, the display of display device may result in
It is poor quality, it is therefore desirable to which that specified value cannot be more than by controlling the luminance difference of different refreshing frequencys under same grayscale.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Invention content
The disclosure is designed to provide a kind of luminance compensation method, luminance compensating mechanism and display device, for
Solve the problems, such as luminance difference caused by being switched by the refreshing frequency of display panel.
Other characteristics and advantages of the disclosure will be apparent from by the following detailed description, or partially by the disclosure
Practice and acquistion.
According to one aspect of the disclosure, a kind of luminance compensation method is provided, the backlight illumination for being applied to display panel is mended
It repays；The luminance compensation method includes：
Obtain corresponding first brightness of the preset gray scale of display pixel under the first refreshing frequency；
Obtain corresponding second brightness of the preset gray scale of display pixel under the second refreshing frequency；
The duty ratio of compensation pulse-width signal is obtained according to the difference of first brightness and second brightness.
In a kind of exemplary embodiment of the disclosure, the duty ratio of the compensation pulse-width signal is equal to the default ash
The sum of the duty ratio of the corresponding pulse-width signal of rank and the change in duty cycle amount of pulse-width signal.
In a kind of exemplary embodiment of the disclosure, the calculation formula of the change in duty cycle amount of the pulse-width signal
For：
Wherein, f [PWM (n)] is the change in duty cycle amount of pulse-width signal, and Δ C is corresponding to different refreshing frequencys
Luminance difference curve, PWM (n) are the duty ratio of the corresponding pulse-width signal of Ln grayscale, and PWM (1) is the corresponding pulsewidth of L1 grayscale
The duty ratio of modulated signal, T are the transmitance of display panel, and A (n) is the corresponding backlight illumination of Ln grayscale, and A (1) is L1 grayscale
Corresponding backlight illumination.
In a kind of exemplary embodiment of the disclosure, the luminance compensation method further includes：
Whether the refreshing frequency for detecting the display panel changes, and is obtained when the refreshing frequency changes
Second refreshing frequency after first refreshing frequency and refreshing before refreshing.
In a kind of exemplary embodiment of the disclosure, the luminance compensation method further includes：
Whether the grayscale for detecting the display pixel changes, and when the grayscale changes according to the pulsewidth
The duty ratio of the duty ratio of modulated signal pulse-width signal corresponding with the grayscale after the acquisition variation of the correspondence of grayscale.
In a kind of exemplary embodiment of the disclosure, the duty ratio of the pulse-width signal and the correspondence of grayscale are deposited
It is stored in inquiry table.
According to one aspect of the disclosure, a kind of luminance compensating mechanism is provided, the backlight illumination for being applied to display panel is mended
It repays；The luminance compensating mechanism includes：
First detection module, the preset gray scale for obtaining the display pixel under the first refreshing frequency are corresponding first bright
Degree；
Second detection module, the preset gray scale for obtaining the display pixel under the second refreshing frequency are corresponding second bright
Degree；
Computing module, for obtaining compensation pulse-width signal according to the difference of first brightness and second brightness
Duty ratio.
In a kind of exemplary embodiment of the disclosure, the duty ratio of the compensation pulse-width signal is equal to the default ash
The sum of the duty ratio of the corresponding pulse-width signal of rank and the change in duty cycle amount of pulse-width signal.
In a kind of exemplary embodiment of the disclosure, the calculation formula of the change in duty cycle amount of the pulse-width signal
For：
Wherein, f [PWM (n)] is the change in duty cycle amount of pulse-width signal, and Δ C is corresponding to different refreshing frequencys
Luminance difference curve, PWM (n) are the duty ratio of the corresponding pulse-width signal of Ln grayscale, and PWM (1) is the corresponding pulsewidth of L1 grayscale
The duty ratio of modulated signal, T are the transmitance of display panel, and A (n) is the corresponding backlight illumination of Ln grayscale, and A (1) is L1 grayscale
Corresponding backlight illumination.
In a kind of exemplary embodiment of the disclosure, the luminance compensating mechanism further includes：
Whether frequency detecting module, the refreshing frequency for detecting the display panel change, and in the refreshing
Second refreshing frequency after obtaining first refreshing frequency before refreshing when frequency changes and refreshing.
In a kind of exemplary embodiment of the disclosure, the luminance compensating mechanism further includes：
Whether grayscale detecting module, the grayscale for detecting the display pixel change, and occur in the grayscale
According to the duty ratio of pulse-width signal pulsewidth corresponding with the grayscale after the acquisition variation of the correspondence of grayscale when variation
The duty ratio of modulated signal.
In a kind of exemplary embodiment of the disclosure, the duty ratio of the pulse-width signal and the correspondence of grayscale are deposited
It is stored in inquiry table.
According to one aspect of the disclosure, a kind of display device, including above-mentioned luminance compensating mechanism are provided.
Luminance compensation method, luminance compensating mechanism and the display device that disclosure illustrative embodiments are provided, can
Brightness value corresponding to different refreshing frequency under same gray level calculates the duty ratio of compensation pulse-width signal, and should
Compensation pulse-width signal is transmitted to the backlight module of display panel, with the automatic adjustment by backlight illumination come to by refreshing frequency
Luminance difference caused by rate variation compensates so that the front and back brightness of refreshing frequency variation is consistent substantially, to ensure
Brightness of the display panel under same grayscale corresponding to different refreshing frequencys is almost the same, can not only be brought in this way to user well
Visual experience, moreover it is possible to support Freesync functions.
It should be understood that above general description and following detailed description is only exemplary and explanatory, not
The disclosure can be limited.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the disclosure
Example, and together with specification for explaining the principles of this disclosure.It should be evident that the accompanying drawings in the following description is only the disclosure
Some embodiments for those of ordinary skill in the art without creative efforts, can also basis
These attached drawings obtain other attached drawings.
Fig. 1 schematically shows the Organization Chart of LCD display device in disclosure exemplary embodiment；
Fig. 2 schematically shows the flow chart of luminance compensation method in disclosure exemplary embodiment；
Fig. 3 schematically shows pulse-width signal and the mapping table of grayscale one in disclosure exemplary embodiment；
Fig. 4 schematically shows the luminance difference curve of different refreshing frequencys in disclosure exemplary embodiment；
Fig. 5 schematically shows pulse-width signal and the mapping table of grayscale two in disclosure exemplary embodiment；
Fig. 6 schematically shows the module diagram of luminance compensating mechanism in disclosure exemplary embodiment；
Fig. 7 schematically shows the module diagram of signal control device in disclosure exemplary embodiment.
Specific implementation mode
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be with a variety of shapes
Formula is implemented, and is not understood as limited to example set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will more
Fully and completely, and by the design of example embodiment comprehensively it is communicated to those skilled in the art.Described feature, knot
Structure or characteristic can be in any suitable manner incorporated in one or more embodiments.
In addition, attached drawing is only the schematic illustrations of the disclosure, it is not necessarily drawn to scale.Identical attached drawing mark in figure
Note indicates same or similar part, thus will omit repetition thereof.Some block diagrams shown in attached drawing are work(
Energy entity, not necessarily must be corresponding with physically or logically independent entity.Software form may be used to realize these work(
Energy entity, or these functional entitys are realized in one or more hardware modules or integrated circuit, or at heterogeneous networks and/or place
These functional entitys are realized in reason device device and/or microcontroller device.
This example embodiment provides a kind of luminance compensation method, can be applied to the backlight illumination compensation of display panel.
As shown in Fig. 2, the luminance compensation method may include：
S1, corresponding first brightness of the preset gray scale of display pixel under the first refreshing frequency is obtained；
S2, corresponding second brightness of the preset gray scale of display pixel under the second refreshing frequency is obtained；
S3, the duty ratio that compensation pulse-width signal PWMO is obtained according to the difference of the first brightness and the second brightness.
The luminance compensation method that disclosure illustrative embodiments are provided, can be according to different refreshing frequencys under same gray level
Corresponding brightness value passes compensation pulse-width signal PWMO to calculate the duty ratio of compensation pulse-width signal PWMO
The backlight module for transporting to display panel, with the automatic adjustment by backlight illumination come to the brightness caused by refreshing frequency variation
Difference compensates so that the front and back brightness of refreshing frequency variation is consistent substantially, to ensure display panel in same grayscale
Brightness corresponding to lower difference refreshing frequency is almost the same, can not only bring good visual experience to user in this way, moreover it is possible to prop up
Hold Freesync functions.
Based on above-mentioned steps, before obtaining the corresponding brightness of different refreshing frequencys, the luminance compensation method can be with
Including：Whether the refreshing frequency of detecting display panel changes, and obtain when refreshing frequency changes before refreshing the
The second refreshing frequency after one refreshing frequency and refreshing.Wherein, the variation of the refreshing frequency can be by initial signal STV
Variation carry out calculate analysis and obtain.
In LCD display device, T-CON (Timing Controller, sequence controller) can be used for exporting display panel
Driving circuit needed for signal.The duty ratio of the pulse-width signal PWM of backlight is also same when T-CON setting themselves gray scale variations
Step variation, such as it is PWM (1) that low grayscale backlight illumination A (1) nit, which corresponds to the duty ratio of pulse-width signal, high gray backlight is bright
The duty ratio that degree A (n) nit corresponds to pulse-width signal is PWM (N).
Originally in a kind of exemplary embodiment, the pulsewidth suitable for a typical refreshing frequency can be prestored in inquiry table
The duty ratio of modulated signal PWM and the correspondence of grayscale.In the case, the duty ratio of compensation pulse-width signal PWMO can
With accounting for equal to the duty ratio of the corresponding pulse-width signal PWM of preset gray scale under typical case's refreshing frequency and pulse-width signal
Sky is than the sum of variable quantity f [PWM (n)].
Based on this, Fig. 3 shows pair of the duty ratio and grayscale of the pulse-width signal PWM suitable for typical refreshing frequency
Answer relational query table.It should be noted that：For simplified expression, the duty ratio PWM (N) of pulse-width signal is reduced in figure
The change in duty cycle amount f [PWM (n)] of P (N), pulse-width signal are reduced to f [P (n)].In the case, once refreshing frequency
It changes, just needs to be corrected the correspondence in inquiry table, that is, need to the corresponding pulse-width signal of same grayscale
The duty ratio of PWM is corrected, such as increases by a pulsewidth on the basis of duty ratio of pre-stored pulse-width signal PWM
The change in duty cycle amount f [PWM (n)] of modulated signal, to be compensated pulse-width signal PWMO.
In the present embodiment, the change in duty cycle amount f [PWM (n)] of the pulse-width signal can by following formula into
Row calculates：
Wherein, f [PWM (n)] is the change in duty cycle amount of pulse-width signal, and Δ C is corresponding to different refreshing frequencys
Luminance difference curve, PWM (n) are the duty ratio of the corresponding pulse-width signal of Ln grayscale, and PWM (1) is the corresponding pulsewidth of L1 grayscale
The duty ratio of modulated signal, T are the transmitance of display panel, and A (n) is the corresponding backlight illumination of Ln grayscale, and A (1) is L1 grayscale
Corresponding backlight illumination.
For example, it is assumed that the brightness under the Ln grayscale of a typical refreshing frequency such as 60Hz is C nit, when refreshing frequency
When rate is switched to 40Hz by 60Hz, front and back luminance difference is Δ C nit, just needs to calculate pulse-width signal by above-mentioned formula at this time
Change in duty cycle amount f [PWM (n)], then the corresponding pulse-width signal of Ln grayscale in 60Hz refreshing frequencys duty ratio PWM
(n) increase the change in duty cycle amount f [PWM (n)] of the pulse-width signal on the basis of using as compensation pulse-width signal
Duty ratio PWMO, and set T-CON and export the compensation pulse-width signal, the front and back brightness base of refreshing frequency variation can be controlled
Originally it is consistent.
In this exemplary another embodiment, the arteries and veins suitable for different refreshing frequencys can be also prestored in inquiry table
The correspondence of the duty ratio and grayscale of wide modulated signal PWM.That is, considering refreshing in advance when making the inquiry table
Luminance difference caused by frequency variation, but since the luminance difference is only limitted to theoretical calculation, it is directed to the compensation of each grayscale
The changing rule of value may not fit like a glove with intrinsic brilliance difference, such as refreshing frequency shown in Fig. 4 is switched to 40Hz by 60Hz
Luminance difference curve, the luminance difference of in-between gray-scale areas is larger, the luminance difference of both sides gray-scale areas is smaller, and preset
Offset may and not meet the changing rule, therefore also need further to correct it.In the case, compensation pulsewidth modulation letter
The duty ratio of number PWMO can be equal to the duty ratio of the corresponding pulse-width signal PWM of the preset gray scale after refreshing frequency variation
The sum of with the change in duty cycle amount f [PWM (n)] of pulse-width signal.
Based on this, Fig. 5 shows pair of the duty ratio and grayscale of the pulse-width signal PWM suitable for different refreshing frequencys
Answer relational query table.It should be noted that：For simplified expression, the pulse-width signal in figure before refreshing frequency variation accounts for
Sky ratio PWM (N) is reduced to P (N), and the duty ratio PWM ' (N) of the pulse-width signal after refreshing frequency variation is reduced to P ' (N),
The change in duty cycle amount f [PWM (n)] of pulse-width signal is reduced to f [P (n)].In the case, once refreshing frequency occurs
Variation, just needs to be corrected the correspondence in inquiry table, that is, needs pulse-width signal PWM's corresponding to same grayscale
Duty ratio is corrected, for example, pre-stored refreshing frequency variation after pulse-width signal PWM ' duty ratio basis
The upper change in duty cycle amount f [PWM (n)] for increasing by a pulse-width signal, to be compensated pulse-width signal PWMO.Wherein,
The calculation of the change in duty cycle amount f [PWM (n)] of the pulse-width signal can refer to a upper embodiment, here not
It repeats again.
It should be noted that：Above step S1-S3 is that corresponding brightness under same gray level and different refreshing frequencys is mended
Compensation method, therefore remained unchanged in the front and back preset gray scale of refreshing frequency variation.But this example embodiment provided it is bright
Degree compensation method can also be used for grayscale and the case where refreshing frequency change, and only needs to consider gray scale variation at this time and bring
Luminance difference and refreshing frequency change the luminance difference brought.
Based on this, the luminance compensation method can further include：Whether the grayscale of detecting display pixel becomes
Change, and when grayscale changes according to the correspondence of the duty ratio of pulse-width signal PWM and grayscale obtain variation after
The duty ratio of the corresponding pulse-width signal PWM of grayscale.Wherein, the variation of the grayscale can be by data-signal Data's
Analytic operation and obtain.
It follows that when detecting grayscale and refreshing frequency changes, change can be first found in inquiry table
The duty ratio of the corresponding pulse-width signal PWM of grayscale after change, such as when grayscale becomes L128 from L64, can first find
The duty ratio of pulse-width signal PWM under L128 grayscale；Then it is directed to further according to any one of above two embodiment
Luminance difference of the grayscale under different refreshing frequencys after variation compensates, such as is switched to 40Hz by 60Hz in refreshing frequency
When, for the duty ratio of the corresponding luminance acquisition compensation pulse-width signal PWM of L128 grayscale.
This example embodiment additionally provides a kind of luminance compensating mechanism, and the backlight illumination for being applied to display panel compensates.
As shown in fig. 6, the luminance compensating mechanism 60 may include：
First detection module 601, the preset gray scale corresponding first for obtaining the display pixel under the first refreshing frequency
Brightness；
Second detection module 602, the preset gray scale corresponding second for obtaining the display pixel under the second refreshing frequency
Brightness；
Computing module 603, for obtaining compensation pulsewidth modulation according to the difference of first brightness and second brightness
The duty ratio of signal.
The luminance compensating mechanism 60 that disclosure illustrative embodiments are provided can refresh frequency according to different under same gray level
Brightness value corresponding to rate calculates the duty ratio of compensation pulse-width signal PWMO, and by compensation pulse-width signal PWMO
It is transmitted to the backlight module of display panel, with the automatic adjustment by backlight illumination come to bright caused by refreshing frequency variation
Degree difference compensates so that the front and back brightness of refreshing frequency variation is consistent substantially, to ensure display panel in same ash
Brightness under rank corresponding to different refreshing frequencys is almost the same, can not only bring good visual experience to user in this way, moreover it is possible to
Support Freesync functions.
In this example embodiment, the luminance compensating mechanism 60 can also include frequency detecting module 604, for detecting
Whether the refreshing frequency of display panel changes, and the first refreshing frequency before refreshing is obtained when refreshing frequency changes
With the second refreshing frequency after refreshing.Wherein, the variation of the refreshing frequency can be by carrying out the variation of initial signal STV
It calculates analysis and obtains.
In view of different gray-scale intensities needs to be controlled by the pulse-width signal PWM of different duty, therefore this
The correspondence of the duty ratio of pulse-width signal PWM and grayscale can be pre-stored in inquiry table by example embodiment.
Originally in a kind of exemplary embodiment, the typical case that is suitable for as shown in Figure 3 can be prestored in inquiry table and is brushed
The correspondence of the duty ratio and grayscale of the pulse-width signal PWM of new frequency.In the case, pulse-width signal is compensated
The duty ratio of PWMO can be equal to the duty ratio and arteries and veins of the corresponding pulse-width signal PWM of preset gray scale under typical case's refreshing frequency
The sum of change in duty cycle amount f [PWM (n)] of wide modulated signal.
In the present embodiment, the change in duty cycle amount of the pulse-width signal can be used following formula and be calculated：
Wherein, f [PWM (n)] is the change in duty cycle amount of pulse-width signal, and Δ C is corresponding to different refreshing frequencys
Luminance difference curve, PWM (n) are the duty ratio of the corresponding pulse-width signal of Ln grayscale, and PWM (1) is the corresponding pulsewidth of L1 grayscale
The duty ratio of modulated signal, T are the transmitance of display panel, and A (n) is the corresponding backlight illumination of Ln grayscale, and A (1) is L1 grayscale
Corresponding backlight illumination.
In this exemplary another embodiment, it can also be prestored in inquiry table shown in fig. 5 suitable for different brushes
The correspondence of the duty ratio and grayscale of the pulse-width signal PWM of new frequency.In the case, pulse-width signal is compensated
The duty ratio of PWMO can be equal to refreshing frequency variation after the corresponding pulse-width signal PWM of the preset gray scale duty ratio with
The sum of change in duty cycle amount f [PWM (n)] of pulse-width signal.Wherein, the preset gray scale after refreshing frequency variation is corresponding
Including the duty ratio of pulse-width signal PWM has been contemplated that in default inquiry table.
The case where can also changing applied to grayscale and refreshing frequency in view of the luminance compensating mechanism 60, therefore
The luminance compensating mechanism can further include：Whether grayscale detecting module 605, the grayscale for detecting display pixel are sent out
Changing, and obtained and changed according to the correspondence of the duty ratio of pulse-width signal PWM and grayscale when grayscale changes
The duty ratio of the corresponding pulse-width signal PWM of grayscale afterwards.Wherein, the variation of the grayscale can be by data-signal
The analytic operation of Data and obtain.
So, when detecting grayscale and refreshing frequency changes, change can be first found in inquiry table
The duty ratio of the corresponding pulse-width signal PWM of grayscale after change, then for the grayscale after variation under different refreshing frequencys
Luminance difference compensates.
It should be noted that：The detail of the luminance compensating mechanism 60 in corresponding luminance compensation method into
Detailed description is gone, which is not described herein again.
Based on any of the above embodiment and its corresponding inquiry table it is found that refreshing frequency changes front and back pulsewidth tune
The duty ratio of signal PWM processed and the correspondence of grayscale can be stored in inquiry table.On this basis, as this example embodiment party
When the luminance compensating mechanism 60 that formula is provided is applied to signal control device such as TCON, as shown in fig. 7, the TCON can be direct
The duty ratio of corresponding compensation pulse-width signal PWMO is searched in the inquiry table 600 generated according to luminance compensating mechanism 60,
And by the output of output module 607 to backlight module, brightness benefit is carried out with the pulse-width signal PWMI to input module 606
It repays.
This example embodiment additionally provides a kind of display device, including display panel, for providing light for display panel
The backlight module in source, the backlight driver for driving backlight module and for for backlight driver provide pulsewidth modulation letter
The TCON of number PWM.Wherein, above-mentioned luminance compensating mechanism 60 can be set in the TCON.
So, the display device automatically adjusting come to bright caused by refreshing frequency variation by backlight illumination
Degree difference compensates, and the luminance difference that refreshing frequency variation can be made front and back is less than preset value, to ensure display panel in same ash
Brightness under rank difference refreshing frequency is almost the same, can not only bring good visual experience to user in this way, moreover it is possible to support
Freesync functions.
It should be noted that：The display device for example may include mobile phone, tablet computer, LCD TV, notebook electricity
Any product or component with display function such as brain, Digital Frame, navigator, TPC.
It should be noted that although being referred to several modules or list for acting the equipment executed in above-detailed
Member, but this division is not enforceable.In fact, according to embodiment of the present disclosure, it is above-described two or more
The feature and function of module either unit can embody in a module or unit.Conversely, an above-described mould
Either the feature and function of unit can be further divided into and embodied by multiple modules or unit block.
In addition, although describing each step of method in the disclosure with particular order in the accompanying drawings, this does not really want
These steps must be executed according to the particular order by asking or implying, or the step having to carry out shown in whole could be realized
Desired result.Additional or alternative, it is convenient to omit multiple steps are merged into a step and executed by certain steps, and/
Or a step is decomposed into execution of multiple steps etc..
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
His embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Adaptive change follow the general principles of this disclosure and include the undocumented common knowledge in the art of the disclosure or
Conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by claim
It points out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the attached claims.
Claims (13)
1. a kind of luminance compensation method, the backlight illumination for being applied to display panel compensates；It is characterized in that, the luminance compensation side
Method includes：
Obtain corresponding first brightness of the preset gray scale of display pixel under the first refreshing frequency；
Obtain corresponding second brightness of the preset gray scale of display pixel under the second refreshing frequency；
The duty ratio of compensation pulse-width signal is obtained according to the difference of first brightness and second brightness.
2. luminance compensation method according to claim 1, which is characterized in that the duty ratio of the compensation pulse-width signal
The sum of the duty ratio of pulse-width signal corresponding equal to the preset gray scale and the change in duty cycle amount of pulse-width signal.
3. luminance compensation method according to claim 2, which is characterized in that the change in duty cycle of the pulse-width signal
The calculation formula of amount is：
Wherein, f [PWM (n)] is the change in duty cycle amount of pulse-width signal, and Δ C is the brightness corresponding to different refreshing frequencys
Poor curve, PWM (n) are the duty ratio of the corresponding pulse-width signal of Ln grayscale, and PWM (1) is the corresponding pulsewidth modulation of L1 grayscale
The duty ratio of signal, T are the transmitance of display panel, and A (n) is the corresponding backlight illumination of Ln grayscale, and A (1) corresponds to for L1 grayscale
Backlight illumination.
4. according to claim 1-3 any one of them luminance compensation methods, which is characterized in that the luminance compensation method also wraps
It includes：
Whether the refreshing frequency for detecting the display panel changes, and obtains and refresh when the refreshing frequency changes
Second refreshing frequency after preceding first refreshing frequency and refreshing.
5. luminance compensation method according to claim 1, which is characterized in that the luminance compensation method further includes：
Whether the grayscale for detecting the display pixel changes, and when the grayscale changes according to the pulsewidth modulation
The duty ratio of the duty ratio of signal pulse-width signal corresponding with the grayscale after the acquisition variation of the correspondence of grayscale.
6. the luminance compensation method according to claim 2 or 5, which is characterized in that the duty ratio of the pulse-width signal
It is stored in inquiry table with the correspondence of grayscale.
7. a kind of luminance compensating mechanism, the backlight illumination for being applied to display panel compensates；It is characterized in that, the luminance compensation dress
Set including：
First detection module, corresponding first brightness of preset gray scale for obtaining the display pixel under the first refreshing frequency；
Second detection module, corresponding second brightness of preset gray scale for obtaining the display pixel under the second refreshing frequency；
Computing module, for obtaining accounting for for compensation pulse-width signal according to the difference of first brightness and second brightness
Empty ratio.
8. luminance compensating mechanism according to claim 7, which is characterized in that the duty ratio of the compensation pulse-width signal
The sum of the duty ratio of pulse-width signal corresponding equal to the preset gray scale and the change in duty cycle amount of pulse-width signal.
9. luminance compensating mechanism according to claim 8, which is characterized in that the change in duty cycle of the pulse-width signal
The calculation formula of amount is：
Wherein, f [PWM (n)] is the change in duty cycle amount of pulse-width signal, and Δ C is the brightness corresponding to different refreshing frequencys
Poor curve, PWM (n) are the duty ratio of the corresponding pulse-width signal of Ln grayscale, and PWM (1) is the corresponding pulsewidth modulation of L1 grayscale
The duty ratio of signal, T are the transmitance of display panel, and A (n) is the corresponding backlight illumination of Ln grayscale, and A (1) corresponds to for L1 grayscale
Backlight illumination.
10. according to claim 7-9 any one of them luminance compensating mechanisms, which is characterized in that the luminance compensating mechanism is also
Including：
Whether frequency detecting module, the refreshing frequency for detecting the display panel change, and in the refreshing frequency
Second refreshing frequency after obtaining first refreshing frequency before refreshing when changing and refreshing.
11. luminance compensating mechanism according to claim 7, which is characterized in that the luminance compensating mechanism further includes：
Grayscale detecting module, whether the grayscale for detecting the display pixel changes, and changes in the grayscale
When variation is obtained with the correspondence of grayscale according to the duty ratio of the pulse-width signal after the corresponding pulsewidth modulation of grayscale
The duty ratio of signal.
12. the luminance compensating mechanism according to claim 8 or 11, which is characterized in that the duty of the pulse-width signal
It is stored in inquiry table than the correspondence with grayscale.
13. a kind of display device, which is characterized in that including claim 7-12 any one of them luminance compensating mechanisms.
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