CN108335677B - Luminance compensation method, luminance compensation device, and display device - Google Patents
Luminance compensation method, luminance compensation device, and display device Download PDFInfo
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- CN108335677B CN108335677B CN201810141590.8A CN201810141590A CN108335677B CN 108335677 B CN108335677 B CN 108335677B CN 201810141590 A CN201810141590 A CN 201810141590A CN 108335677 B CN108335677 B CN 108335677B
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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
The disclosure provides a brightness compensation method, a brightness compensation device and a display device, which are applied to backlight brightness compensation of a display panel and relate to the technical field of display. The brightness compensation method comprises the following steps: acquiring first brightness corresponding to a preset gray scale of a display pixel at a first refreshing frequency; acquiring second brightness corresponding to the preset gray scale of the display pixel at a second refreshing frequency; and acquiring the duty ratio of the compensation pulse width modulation signal according to the difference value of the first brightness and the second brightness. The present disclosure can guarantee the brightness stability at different refresh frequencies.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a brightness compensation method, a brightness compensation device, and a display device.
Background
With the rapid development of optical technology and semiconductor technology, flat panel displays represented by Liquid Crystal Displays (LCD) have the characteristics of lightness, thinness, low energy consumption, fast response speed, good color purity, high contrast ratio and the like, and occupy a leading position in the Display field.
Fig. 1 shows an architecture diagram of an LCD display device. The LCD display device 10 may include a display panel 101, a driving circuit 102 for driving the display panel 101, a backlight module 103 for providing a light source for the display panel 101, a backlight driver 104 for driving the backlight module 103, and a timing controller 105 for controlling the driving circuit 102; the backlight driver 104 needs to adjust the on-off time of the backlight module 103 according to the duty ratio of the pulse width modulation signal PWM transmitted by the timing controller 105, so as to control the light emitting brightness of the backlight module 103.
However, when the display panels have the same gray scale but different refresh frequencies, such as the display panel supporting the fresync (display frequency conversion technology), the actual brightness of the display panel will have a certain difference, and the refresh frequency is inversely proportional to the display brightness at the same gray scale. If the brightness difference is too large, the vision of human eyes is affected, and the display quality of the display device is poor, so that the brightness difference of different refresh frequencies under the same gray scale needs to be controlled to be not more than a specified value.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the present disclosure is to provide a brightness compensation method, a brightness compensation device, and a display device for solving the brightness difference problem caused by the refresh frequency switching of a display panel.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows, or in part will be obvious from the description, or may be learned by practice of the disclosure.
According to an aspect of the present disclosure, there is provided a luminance compensation method applied to backlight luminance compensation of a display panel; the brightness compensation method includes:
acquiring first brightness corresponding to a preset gray scale of a display pixel at a first refreshing frequency;
acquiring second brightness corresponding to the preset gray scale of the display pixel at a second refreshing frequency;
and acquiring the duty ratio of the compensation pulse width modulation signal according to the difference value of the first brightness and the second brightness.
In an exemplary embodiment of the disclosure, the duty ratio of the compensation pwm signal is equal to the sum of the duty ratio of the pwm signal corresponding to the preset gray scale and the duty ratio variation of the pwm signal.
In an exemplary embodiment of the present disclosure, the calculation formula of the duty ratio variation of the pulse width modulation signal is:
wherein f [ PWM (n) ] is the duty ratio variation of the PWM signal, Δ C is the luminance difference curve corresponding to different refresh frequencies, PWM (n) is the duty ratio of the PWM signal corresponding to the Ln gray scale, PWM (1) is the duty ratio of the PWM signal corresponding to the L1 gray scale, T is the transmittance of the display panel, a (n) is the backlight luminance corresponding to the Ln gray scale, and a (1) is the backlight luminance corresponding to the L1 gray scale.
In an exemplary embodiment of the present disclosure, the luminance compensation method further includes:
detecting whether the refresh frequency of the display panel changes or not, and acquiring the first refresh frequency before refreshing and the second refresh frequency after refreshing when the refresh frequency changes.
In an exemplary embodiment of the present disclosure, the luminance compensation method further includes:
and detecting whether the gray scale of the display pixel is changed or not, and acquiring the duty ratio of the pulse width modulation signal corresponding to the changed gray scale according to the corresponding relation between the duty ratio of the pulse width modulation signal and the gray scale when the gray scale is changed.
In an exemplary embodiment of the present disclosure, a correspondence relationship between a duty ratio of the pulse width modulation signal and a gray scale is stored in a lookup table.
According to an aspect of the present disclosure, there is provided a luminance compensation apparatus applied to backlight luminance compensation of a display panel; the brightness compensation device includes:
the first detection module is used for acquiring first brightness corresponding to a preset gray scale of a display pixel at a first refreshing frequency;
the second detection module is used for acquiring second brightness corresponding to the preset gray scale of the display pixel at a second refreshing frequency;
and the calculating module is used for acquiring the duty ratio of the compensation pulse width modulation signal according to the difference value of the first brightness and the second brightness.
In an exemplary embodiment of the disclosure, the duty ratio of the compensation pwm signal is equal to the sum of the duty ratio of the pwm signal corresponding to the preset gray scale and the duty ratio variation of the pwm signal.
In an exemplary embodiment of the present disclosure, the calculation formula of the duty ratio variation of the pulse width modulation signal is:
wherein f [ PWM (n) ] is the duty ratio variation of the PWM signal, Δ C is the luminance difference curve corresponding to different refresh frequencies, PWM (n) is the duty ratio of the PWM signal corresponding to the Ln gray scale, PWM (1) is the duty ratio of the PWM signal corresponding to the L1 gray scale, T is the transmittance of the display panel, a (n) is the backlight luminance corresponding to the Ln gray scale, and a (1) is the backlight luminance corresponding to the L1 gray scale.
In an exemplary embodiment of the present disclosure, the luminance compensation apparatus further includes:
and the frequency detection module is used for detecting whether the refresh frequency of the display panel changes or not, and acquiring the first refresh frequency before refreshing and the second refresh frequency after refreshing when the refresh frequency changes.
In an exemplary embodiment of the present disclosure, the luminance compensation apparatus further includes:
and the gray scale detection module is used for detecting whether the gray scale of the display pixel changes or not and acquiring the duty ratio of the pulse width modulation signal corresponding to the changed gray scale according to the corresponding relation between the duty ratio of the pulse width modulation signal and the gray scale when the gray scale changes.
In an exemplary embodiment of the present disclosure, a correspondence relationship between a duty ratio of the pulse width modulation signal and a gray scale is stored in a lookup table.
According to an aspect of the present disclosure, there is provided a display device including the above-mentioned brightness compensation device.
The brightness compensation method, the brightness compensation device and the display device provided by the exemplary embodiment of the disclosure can calculate the duty ratio of the compensation pulse width modulation signal according to the brightness values corresponding to different refresh frequencies under the same gray scale, and transmit the compensation pulse width modulation signal to the backlight module of the display panel, so as to compensate the brightness difference caused by the refresh frequency change through the automatic adjustment of the backlight brightness, so that the brightness before and after the refresh frequency change is basically consistent, thereby ensuring that the brightness corresponding to different refresh frequencies of the display panel under the same gray scale is basically consistent, thus not only bringing good visual experience to users, but also supporting the Freesync function.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 schematically illustrates an architecture diagram of an LCD display device in an exemplary embodiment of the present disclosure;
FIG. 2 schematically illustrates a flow chart of a method of brightness compensation in an exemplary embodiment of the present disclosure;
FIG. 3 schematically illustrates a first mapping table of PWM signals and gray scales in an exemplary embodiment of the present disclosure;
FIG. 4 schematically illustrates a luminance difference curve for different refresh frequencies in an exemplary embodiment of the present disclosure;
FIG. 5 schematically shows a second mapping table of PWM signals and gray scales in an exemplary embodiment of the disclosure;
fig. 6 schematically illustrates a block diagram of a luminance compensation apparatus in an exemplary embodiment of the present disclosure;
fig. 7 schematically shows a block schematic diagram of a signal control device in an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The present example embodiment provides a luminance compensation method applicable to backlight luminance compensation of a display panel. As shown in fig. 2, the brightness compensation method may include:
s1, acquiring first brightness corresponding to a preset gray scale of a display pixel at a first refresh frequency;
s2, acquiring second brightness corresponding to the preset gray scale of the display pixel at a second refreshing frequency;
and S3, acquiring the duty ratio of the compensation pulse width modulation signal PWMO according to the difference value of the first brightness and the second brightness.
The brightness compensation method provided by the exemplary embodiment of the disclosure can calculate the duty ratio of the compensation pulse width modulation signal PWMO according to the brightness values corresponding to different refresh frequencies under the same gray scale, and transmit the compensation pulse width modulation signal PWMO to the backlight module of the display panel, so as to compensate the brightness difference caused by the refresh frequency change through the automatic adjustment of the backlight brightness, so that the brightness before and after the refresh frequency change is basically kept consistent, thereby ensuring that the brightness of the display panel corresponding to different refresh frequencies under the same gray scale is basically consistent, which not only can bring good visual experience to users, but also can support the Freesync function.
Based on the above steps, before obtaining the luminances corresponding to different refresh frequencies, the luminance compensation method may further include: whether the refresh frequency of the display panel changes or not is detected, and a first refresh frequency before refreshing and a second refresh frequency after refreshing are obtained when the refresh frequency changes. Wherein, the change of the refresh frequency can be obtained by calculating and analyzing the change of the start signal STV.
In the LCD display device, a T-CON (Timing Controller) may be used to output signals required for a driving circuit of a display panel. The duty ratio of the pulse width modulation signal PWM of the backlight is synchronously changed when the T-CON itself sets the gray scale change, for example, the duty ratio of the pulse width modulation signal corresponding to the low gray scale backlight brightness a (1) nit is PWM (1), and the duty ratio of the pulse width modulation signal corresponding to the high gray scale backlight brightness a (n) nit is PWM (n).
In one embodiment of the present example, the corresponding relationship between the duty ratio and the gray level of the pulse width modulation signal PWM suitable for a typical refresh frequency may be stored in the lookup table in advance. In this case, the duty ratio of the compensation pulse width modulation signal PWMO may be equal to the sum of the duty ratio of the pulse width modulation signal PWM corresponding to the preset gray level at the typical refresh frequency and the duty ratio variation f [ PWM (n) ].
Based on this, fig. 3 shows a lookup table of the correspondence between the duty ratio and the gray scale of the pulse width modulation signal PWM suitable for a typical refresh frequency. It should be noted that: in order to simplify the expression, the duty ratio pwm (n) of the pulse width modulation signal is simplified as p (n), and the duty ratio variation f [ pwm (n) ] of the pulse width modulation signal is simplified as f [ p (n) ]. In this case, once the refresh frequency changes, the corresponding relationship in the lookup table needs to be corrected, that is, the duty ratio of the pulse width modulation signal PWM corresponding to the same gray level needs to be corrected, for example, the duty ratio change amount f [ PWM (n) ] of the pulse width modulation signal is added to the pre-stored duty ratio of the pulse width modulation signal PWM to obtain the compensated pulse width modulation signal PWMO.
In this embodiment, the duty ratio variation f [ pwm (n) ] of the pulse width modulation signal may be calculated by the following formula:
wherein f [ PWM (n) ] is the duty ratio variation of the PWM signal, Δ C is the luminance difference curve corresponding to different refresh frequencies, PWM (n) is the duty ratio of the PWM signal corresponding to the Ln gray scale, PWM (1) is the duty ratio of the PWM signal corresponding to the L1 gray scale, T is the transmittance of the display panel, a (n) is the backlight luminance corresponding to the Ln gray scale, and a (1) is the backlight luminance corresponding to the L1 gray scale.
For example, assuming that the brightness at Ln gray scale of a typical refresh frequency, such as 60Hz, is C nit, when the refresh frequency is switched from 60Hz to 40Hz, the front-back brightness difference is Δ C nit, at this time, the duty ratio variation f [ pwm (n) ] of the pwm signal is calculated by the above formula, and then the duty ratio variation f [ pwm (n) ] of the pwm signal is increased on the basis of the duty ratio pwm (n) of the pwm signal corresponding to Ln gray scale of the refresh frequency of 60Hz to be used as the duty ratio PWMO of the compensation pwm signal, and the T-CON is set to output the compensation pwm signal, so that the brightness before and after the refresh frequency change can be controlled to be substantially consistent.
In another embodiment of this example, the corresponding relationship between the duty ratio and the gray scale of the pulse width modulation signal PWM suitable for different refresh frequencies may be stored in the lookup table in advance. That is, the brightness difference caused by the refresh frequency variation is considered in advance when the lookup table is made, but the brightness difference is limited to the theoretical calculation, and the variation rule of the compensation value for each gray scale is not completely consistent with the actual brightness difference, for example, the brightness difference curve of the refresh frequency curve shown in fig. 4 is switched from 60Hz to 40Hz, the brightness difference of the middle gray scale region is larger, the brightness difference of the two gray scale regions is smaller, and the preset compensation value may not meet the variation rule, so it needs to be further corrected. In this case, the duty ratio of the compensation pulse width modulation signal PWMO may be equal to the sum of the duty ratio of the pulse width modulation signal PWM corresponding to the preset gray level after the refresh frequency is changed and the duty ratio variation f [ PWM (n) ].
Based on this, fig. 5 shows a lookup table of the correspondence between the duty ratio and the gray scale of the pulse width modulation signal PWM suitable for different refresh frequencies. It should be noted that: in order to simplify the expression, the duty ratio PWM (N) of the pulse width modulation signal before the refresh frequency is changed is simplified to P (N), the duty ratio PWM '(N) of the pulse width modulation signal after the refresh frequency is changed is simplified to P' (N), and the duty ratio variation f [ PWM (N) ] of the pulse width modulation signal is simplified to f [ P (N) ]. In this case, once the refresh frequency changes, the corresponding relationship in the lookup table needs to be corrected, that is, the duty ratio of the pulse width modulation signal PWM corresponding to the same gray level needs to be corrected, for example, the duty ratio change amount f [ PWM (n) ] of the pulse width modulation signal is added to the pre-stored duty ratio of the pulse width modulation signal PWM' after the refresh frequency changes, so as to obtain the compensated pulse width modulation signal PWMO. For the calculation of the duty ratio variation f [ pwm (n) ], reference may be made to the previous embodiment, which is not described herein again.
It should be noted that: the above steps S1-S3 are corresponding luminance compensation methods under the same gray scale and different refresh frequencies, so the preset gray scale before and after the refresh frequency is changed remains unchanged. However, the brightness compensation method provided by the present exemplary embodiment can also be used when both the gray scale and the refresh frequency are changed, and at this time, only the brightness difference caused by the gray scale change and the brightness difference caused by the refresh frequency change need to be considered comprehensively.
Based on this, the brightness compensation method may further include: and detecting whether the gray scale of the display pixel is changed or not, and acquiring the duty ratio of the pulse width modulation signal PWM corresponding to the changed gray scale according to the corresponding relation between the duty ratio of the pulse width modulation signal PWM and the gray scale when the gray scale is changed. Wherein, the change of the gray scale can be obtained by analyzing and calculating the Data signal Data.
Therefore, when it is detected that both the gray scale and the refresh frequency are changed, the duty ratio of the PWM signal PWM corresponding to the changed gray scale can be found in the lookup table, for example, when the gray scale is changed from L64 to L128, the duty ratio of the PWM signal PWM under the L128 gray scale can be found first; then, the brightness difference of the changed gray scale at different refresh frequencies is compensated according to any one of the two embodiments, for example, when the refresh frequency is switched from 60Hz to 40Hz, the duty ratio of the compensation pulse width modulation signal PWM is obtained for the brightness corresponding to the L128 gray scale.
The present exemplary embodiment also provides a luminance compensation apparatus applied to backlight luminance compensation of a display panel. As shown in fig. 6, the luminance compensation device 60 may include:
the first detection module 601 is configured to obtain first brightness corresponding to a preset gray scale of a display pixel at a first refresh frequency;
a second detecting module 602, configured to obtain a second brightness corresponding to a preset gray scale of a display pixel at a second refresh frequency;
the calculating module 603 is configured to obtain a duty ratio of the compensated pwm signal according to a difference between the first brightness and the second brightness.
The brightness compensation device 60 according to the exemplary embodiment of the present disclosure may calculate the duty ratio of the compensation pulse width modulation signal PWMO according to the brightness values corresponding to different refresh frequencies at the same gray scale, and transmit the compensation pulse width modulation signal PWMO to the backlight module of the display panel, so as to compensate the brightness difference caused by the refresh frequency change by automatically adjusting the backlight brightness, so that the brightness before and after the refresh frequency change is substantially consistent, thereby ensuring that the brightness of the display panel corresponding to different refresh frequencies at the same gray scale is substantially consistent, which not only provides a good visual experience for a user, but also supports the Freesync function.
In this exemplary embodiment, the luminance compensation apparatus 60 may further include a frequency detecting module 604, configured to detect whether a refresh frequency of the display panel changes, and obtain a first refresh frequency before the refresh and a second refresh frequency after the refresh when the refresh frequency changes. Wherein, the change of the refresh frequency can be obtained by calculating and analyzing the change of the start signal STV.
In consideration of the fact that different gray-scale brightness needs to be controlled by the pulse width modulation signals PWM with different duty ratios, the present exemplary embodiment may store the correspondence between the duty ratios of the pulse width modulation signals PWM and the gray scales in the lookup table in advance.
In one embodiment of the present example, the corresponding relationship between the duty ratio and the gray scale of the pulse width modulation signal PWM suitable for a typical refresh frequency as shown in fig. 3 may be stored in a lookup table in advance. In this case, the duty ratio of the compensation pulse width modulation signal PWMO may be equal to the sum of the duty ratio of the pulse width modulation signal PWM corresponding to the preset gray level at the typical refresh frequency and the duty ratio variation f [ PWM (n) ].
In this embodiment, the duty ratio variation of the pulse width modulation signal may be calculated by using the following formula:
wherein f [ PWM (n) ] is the duty ratio variation of the PWM signal, Δ C is the luminance difference curve corresponding to different refresh frequencies, PWM (n) is the duty ratio of the PWM signal corresponding to the Ln gray scale, PWM (1) is the duty ratio of the PWM signal corresponding to the L1 gray scale, T is the transmittance of the display panel, a (n) is the backlight luminance corresponding to the Ln gray scale, and a (1) is the backlight luminance corresponding to the L1 gray scale.
In another embodiment of this example, the corresponding relationship between the duty ratio and the gray scale of the pulse width modulation signal PWM suitable for different refresh frequencies shown in fig. 5 may be stored in a lookup table in advance. In this case, the duty ratio of the compensation pulse width modulation signal PWMO may be equal to the sum of the duty ratio of the pulse width modulation signal PWM corresponding to the preset gray level after the refresh frequency is changed and the duty ratio variation f [ PWM (n) ]. And the duty ratio of the pulse width modulation signal PWM corresponding to the preset gray scale after the refreshing frequency is changed is already taken into account when the look-up table is preset.
Considering that the brightness compensation device 60 can also be applied to the case where both the gray scale and the refresh frequency are changed, the brightness compensation device can further include: the gray scale detecting module 605 is configured to detect whether a gray scale of the display pixel changes, and obtain a duty ratio of the pulse width modulation signal PWM corresponding to the changed gray scale according to a correspondence between the duty ratio of the pulse width modulation signal PWM and the gray scale when the gray scale changes. Wherein, the change of the gray scale can be obtained by analyzing and calculating the Data signal Data.
Therefore, when the gray scale and the refresh frequency are detected to be changed, the duty ratio of the pulse width modulation signal PWM corresponding to the changed gray scale can be found in the lookup table, and then the brightness difference of the changed gray scale at different refresh frequencies is compensated.
It should be noted that: the details of the brightness compensation device 60 have been described in detail in the corresponding brightness compensation method, and are not described herein again.
Based on any of the above embodiments and the corresponding lookup table, the correspondence between the duty ratio and the gray level of the PWM signal before and after the refresh frequency change can be stored in the lookup table. On the basis, when the brightness compensation device 60 provided in the present exemplary embodiment is applied to a signal control device, such as a TCON, as shown in fig. 7, the TCON can directly look up the duty ratio of the corresponding compensated pwm signal PWMO in the look-up table 600 generated by the brightness compensation device 60, and output the duty ratio to the backlight module through the output module 607 to perform brightness compensation on the pwm signal PWMI of the input module 606.
The present exemplary embodiment also provides a display device including a display panel, a backlight module for providing a light source for the display panel, a backlight driver for driving the backlight module, and a TCON for providing a pulse width modulation signal PWM for the backlight driver. The TCON may be provided with the brightness compensation device 60.
Therefore, the display device compensates the brightness difference caused by the change of the refresh frequency through the automatic adjustment of the backlight brightness, and the brightness difference before and after the change of the refresh frequency can be smaller than the preset value, so that the brightness of the display panel under the same gray scale and different refresh frequencies is basically consistent, good visual experience can be brought to a user, and the Freesync function can be supported.
It should be noted that: the display device may include any product or component with a display function, such as a mobile phone, a tablet computer, a liquid crystal television, a notebook computer, a digital photo frame, a navigator, a TPC, and the like.
It should be noted that although in the above detailed description several modules or units of the device for action execution are mentioned, such a division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Moreover, although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (13)
1. A brightness compensation method is applied to the backlight brightness compensation of a display panel; the brightness compensation method is characterized by comprising the following steps:
acquiring first brightness corresponding to a preset gray scale of a display pixel at a first refreshing frequency;
acquiring second brightness corresponding to the preset gray scale of the display pixel at a second refreshing frequency;
and acquiring the duty ratio of the compensation pulse width modulation signal according to the difference value of the first brightness and the second brightness.
2. The luminance compensation method as claimed in claim 1, wherein the duty ratio of the compensation pulse width modulation signal is equal to the sum of the duty ratio of the pulse width modulation signal corresponding to the preset gray scale and the duty ratio variation of the pulse width modulation signal.
3. The luminance compensation method as claimed in claim 2, wherein the duty ratio variation of the pulse width modulation signal is calculated by:
wherein f [ PWM (n) ] is the duty ratio variation of the PWM signal, Δ C is the brightness difference corresponding to different refresh frequencies, PWM (n) is the duty ratio of the PWM signal corresponding to the Ln gray scale, PWM (1) is the duty ratio of the PWM signal corresponding to the L1 gray scale, T is the transmittance of the display panel, a (n) is the backlight brightness corresponding to the Ln gray scale, and a (1) is the backlight brightness corresponding to the L1 gray scale.
4. The luminance compensation method according to any one of claims 1 to 3, wherein before acquiring the luminances corresponding to the different refresh frequencies, the luminance compensation method further comprises:
detecting whether the refresh frequency of the display panel changes or not, and acquiring the first refresh frequency before refreshing and the second refresh frequency after refreshing when the refresh frequency changes.
5. The luminance compensation method according to claim 1, wherein the luminance compensation method further comprises:
and detecting whether the gray scale of the display pixel is changed or not, and acquiring the duty ratio of the pulse width modulation signal corresponding to the changed gray scale according to the corresponding relation between the duty ratio of the pulse width modulation signal and the gray scale when the gray scale is changed.
6. The luminance compensation method as claimed in claim 2 or 5, wherein the corresponding relationship between the duty ratio of the pulse width modulation signal and the gray scale is stored in a look-up table.
7. A kind of luminance compensating gear, apply to the luminance compensation of the backlight of the display panel; characterized in that the brightness compensation device comprises:
the first detection module is used for acquiring first brightness corresponding to a preset gray scale of a display pixel at a first refreshing frequency;
the second detection module is used for acquiring second brightness corresponding to the preset gray scale of the display pixel at a second refreshing frequency;
and the calculating module is used for acquiring the duty ratio of the compensation pulse width modulation signal according to the difference value of the first brightness and the second brightness.
8. The luminance compensation device as claimed in claim 7, wherein the duty ratio of the compensation pulse width modulation signal is equal to the sum of the duty ratio of the pulse width modulation signal corresponding to the preset gray scale and the duty ratio variation of the pulse width modulation signal.
9. The apparatus of claim 8, wherein the amount of change in duty cycle of the pwm signal is calculated by:
wherein f [ PWM (n) ] is the duty ratio variation of the PWM signal, Δ C is the brightness difference corresponding to different refresh frequencies, PWM (n) is the duty ratio of the PWM signal corresponding to the Ln gray scale, PWM (1) is the duty ratio of the PWM signal corresponding to the L1 gray scale, T is the transmittance of the display panel, a (n) is the backlight brightness corresponding to the Ln gray scale, and a (1) is the backlight brightness corresponding to the L1 gray scale.
10. The luminance compensation device according to any one of claims 7 to 9, further comprising:
the frequency detection module is used for detecting whether the refresh frequency of the display panel changes before the brightness corresponding to different refresh frequencies is obtained, and obtaining the first refresh frequency before refreshing and the second refresh frequency after refreshing when the refresh frequency changes.
11. The luminance compensation device according to claim 7, further comprising:
and the gray scale detection module is used for detecting whether the gray scale of the display pixel changes or not and acquiring the duty ratio of the pulse width modulation signal corresponding to the changed gray scale according to the corresponding relation between the duty ratio of the pulse width modulation signal and the gray scale when the gray scale changes.
12. The apparatus of claim 8 or 11, wherein the correspondence between the duty ratio of the pulse width modulation signal and the gray scale is stored in a look-up table.
13. A display device comprising the luminance compensation device as claimed in any one of claims 7 to 12.
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| CN201810141590.8A CN108335677B (en) | 2018-02-11 | 2018-02-11 | Luminance compensation method, luminance compensation device, and display device |
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| CN201810141590.8A CN108335677B (en) | 2018-02-11 | 2018-02-11 | Luminance compensation method, luminance compensation device, and display device |
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| CN109147668B (en) * | 2018-09-25 | 2020-08-04 | 京东方科技集团股份有限公司 | External compensation method of display panel, driving unit and display panel |
| CN109410892B (en) * | 2018-11-21 | 2020-09-04 | 苏州佳世达电通有限公司 | Image processing method and display device |
| CN109686303B (en) * | 2019-01-28 | 2021-09-17 | 厦门天马微电子有限公司 | Organic light-emitting display panel, organic light-emitting display device and compensation method |
| CN110751933B (en) * | 2019-12-04 | 2021-09-17 | 京东方科技集团股份有限公司 | Display method and device for refresh rate switching, computer equipment and medium |
| CN111312191B (en) * | 2020-04-01 | 2021-04-27 | Tcl华星光电技术有限公司 | Time schedule controller, gray scale voltage adjusting method and liquid crystal display panel |
| CN111429850A (en) | 2020-04-08 | 2020-07-17 | 深圳市华星光电半导体显示技术有限公司 | Display panel and display method thereof |
| CN111354323B (en) * | 2020-04-26 | 2021-07-27 | 成都中电熊猫显示科技有限公司 | Display panel brightness control method and display device |
| WO2021238361A1 (en) * | 2020-05-26 | 2021-12-02 | 海信视像科技股份有限公司 | Display device and display control method |
| CN111540331A (en) * | 2020-05-27 | 2020-08-14 | Tcl华星光电技术有限公司 | Brightness compensation method and device and brightness compensation system |
| CN111640390A (en) * | 2020-06-30 | 2020-09-08 | 京东方科技集团股份有限公司 | Display screen flicker adjusting circuit and method and display device |
| CN111883070B (en) * | 2020-07-30 | 2021-09-10 | 重庆惠科金渝光电科技有限公司 | Driving method and driving module of display panel and display device |
| CN112419976B (en) | 2020-09-30 | 2022-04-12 | Tcl华星光电技术有限公司 | Driving method of display device and display device |
| CN112331124B (en) * | 2020-11-18 | 2022-11-29 | 云谷（固安）科技有限公司 | Display compensation method of display panel, display panel and display device |
| CN112542124B (en) * | 2020-12-04 | 2022-08-05 | Tcl华星光电技术有限公司 | Brightness compensation method, brightness compensation device and display device |
| CN114650324B (en) * | 2020-12-21 | 2023-03-14 | 深圳市万普拉斯科技有限公司 | Frame frequency switching method and device, terminal equipment and readable storage medium |
| CN113487993B (en) * | 2021-05-18 | 2024-04-05 | 昆山国显光电有限公司 | Display panel driving method, device and storage medium |
| CN113380173B (en) * | 2021-06-08 | 2023-01-20 | 昆山国显光电有限公司 | Display compensation method and device of display panel, display device and medium |
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| CN113470581B (en) * | 2021-07-08 | 2022-11-18 | 北京京东方显示技术有限公司 | Method and device for controlling backlight brightness of display, electronic equipment and storage medium |
| CN113823233A (en) * | 2021-09-30 | 2021-12-21 | 深圳市华星光电半导体显示技术有限公司 | Display device and control method thereof |
| CN114446216A (en) * | 2022-02-18 | 2022-05-06 | 合肥芯颖科技有限公司 | Brightness compensation method and device, electronic equipment, storage medium and display panel |
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| CN101414438B (en) * | 2007-10-15 | 2010-09-15 | 联咏科技股份有限公司 | Apparatus and method for dynamically controlling backlight source |
| CN101540154B (en) * | 2009-04-24 | 2011-02-02 | 福建捷联电子有限公司 | Method for dynamically reducing power of liquid crystal display |
| CN103310765B (en) * | 2013-06-14 | 2015-12-23 | 青岛海信信芯科技有限公司 | Backlight illumination compensation method and display device |
| CN103295553B (en) * | 2013-06-26 | 2015-02-18 | 青岛海信信芯科技有限公司 | Direct type backlight luminance compensation method and display device |
| CN105575341A (en) * | 2016-03-15 | 2016-05-11 | 武汉华星光电技术有限公司 | Liquid crystal display device and backlight control method thereof |
| CN105632421B (en) * | 2016-03-18 | 2018-08-07 | 青岛海信电器股份有限公司 | Back light source brightness control method, Apparatus and liquid crystal display equipment |
| CN105810156B (en) * | 2016-05-25 | 2018-06-01 | 武汉华星光电技术有限公司 | Backlight adjusting method and backlight regulating circuit |
| CN106297731A (en) * | 2016-09-14 | 2017-01-04 | 乐视控股（北京）有限公司 | Strengthen the method and device of picture contrast, display screen and intelligent terminal |
| CN106373516B (en) * | 2016-10-31 | 2019-08-13 | 北京集创北方科技股份有限公司 | LED display and its driving method |
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