CN109523958B - Backlight module, scanning driving method of backlight module and display device - Google Patents
Backlight module, scanning driving method of backlight module and display device Download PDFInfo
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- CN109523958B CN109523958B CN201811615598.XA CN201811615598A CN109523958B CN 109523958 B CN109523958 B CN 109523958B CN 201811615598 A CN201811615598 A CN 201811615598A CN 109523958 B CN109523958 B CN 109523958B
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- 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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Abstract
The invention discloses a backlight module, a scanning driving method of the backlight module and a display device, belonging to the technical field of display, wherein the backlight module comprises a plurality of luminous zones, a scanning driving module and a data updating module, wherein each luminous zone at least comprises a luminous unit, and the scanning driving module and the data updating module are respectively and electrically connected with the luminous units; the scanning driving method of the backlight module comprises a scanning driving stage and a plurality of data updating stages; in the scanning driving stage, the scanning driving module provides a scanning driving signal to the light emitting area; in the data updating stage, the data updating module provides a data updating driving signal for the light emitting area; the working time period of the data updating phase at least partially overlaps with the working time period of the scanning driving phase. The invention can reduce the power consumption of the backlight module, improve the backlight scanning frequency, solve the problem of backlight flicker caused by data update and improve the light emitting effect and the light emitting quality of the backlight module.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight module, a scanning driving method of the backlight module, and a display device.
Background
With the development of display technology, liquid crystal displays are more and more widely used, a backlight source and a liquid crystal display screen are combined together to form a liquid crystal display module, and a backlight module is one of key components of a liquid crystal display panel and has the function of supplying sufficient light sources with uniform brightness and distribution so as to normally display images. The backlight module in the prior art is generally divided into an edge type backlight module and a direct type backlight module, wherein the light source of the edge type backlight module is a single light source arranged on the side edge, and the single light source is incident from the side edge of the light guide plate, so that the backlight module has the characteristics of light weight, thinness, narrow framing and low power consumption. The whole spontaneous light source of the direct type backlight module is arranged under the light-emitting surface of the backlight module, and the arrangement space is enlarged, so that the thickness, the weight and the power consumption of the module are increased, and the direct type backlight module has the advantages of good light-emitting visual angle, high light utilization efficiency, simple structure and the like. From the technical development trend, how to reduce the power consumption of the backlight is most concerned, because the backlight source is the largest energy consumer, the power consumption of the backlight is reduced, and the power consumption of the whole machine can be reduced. The improvement techniques include improving a driving circuit of a backlight, improving luminous efficiency of an LED light source, developing new LED types, and the like, and currently, Local Dimming (Local Dimming) is the most easily implemented technique among the techniques and the most obvious technique. Especially, the direct type backlight module is matched with a Local Dimming technology, so that the electric quantity can be greatly reduced, the contrast value and the gray scale number of a display picture can be improved, the residual image can be reduced and the like, the Local Dimming technology is a backlight source of the backlight module consisting of hundreds of LED light sources, the LED light sources can be adjusted according to the brightness and darkness of an image, the brightness of a high-brightness part in the image of the display screen can be maximized, meanwhile, the brightness of a dark part can be reduced, even the dark part is closed, so that the optimal contrast is achieved, and the power consumption of the backlight is reduced due to the reduction of the brightness of the dark part.
In the prior art, the driving methods of the direct-type backlight module are classified into one-to-one and scanning, and in the driving timing sequence of the scanning backlight module, the PWM (Pulse Width Modulation) data needs to be updated before the next frame is displayed, otherwise, the backlight brightness does not correspond to the display content of the display panel, and abnormal display occurs. During the period of updating the PWM data, all the LED light sources are in a closed state, namely, the scanning of the LED light sources is suspended, so that a low-frequency component is introduced into the scanning frequency of the LED light sources, the backlight flicker problem is further caused, and the longer the backlight scanning suspension time is, the more obvious the flicker phenomenon is.
Therefore, it is an urgent need to provide a backlight module, a scanning driving method of the backlight module, and a display device that can reduce the backlight current, save power consumption, increase the scanning frequency, and improve the backlight flicker phenomenon.
Disclosure of Invention
In view of this, the present invention provides a backlight module, a scanning driving method of the backlight module, and a display device, and aims to solve the problems of high energy consumption, low scanning frequency, and backlight flicker in the prior art.
The invention provides a scanning driving method of a backlight module, wherein the backlight module comprises a plurality of light emitting areas, a scanning driving module and a data updating module, the light emitting areas at least comprise a light emitting unit, and the scanning driving module and the data updating module are respectively electrically connected with the light emitting unit; the scanning driving method of the backlight module comprises a scanning driving stage and a plurality of data updating stages; in the scanning driving stage, the scanning driving module provides a scanning driving signal to the light emitting area; in the data updating stage, the data updating module provides a data updating driving signal for the light emitting area; the working time period of the data updating phase at least partially overlaps with the working time period of the scanning driving phase.
Based on the same idea, the invention also provides a backlight module, and the backlight module uses the scanning driving method of the backlight module.
Based on the same idea, the invention also provides a display device which comprises the backlight module.
Compared with the prior art, the backlight module, the scanning driving method of the backlight module and the display device provided by the invention at least realize the following beneficial effects:
in the scanning driving method of the backlight module, the backlight module comprises a plurality of luminous areas, each luminous area at least comprises one luminous unit, the brightness of each different luminous area can be adjusted according to the brightness of the image displayed by the display panel, namely, the brightness of the luminous area of the high-brightness part in the displayed image can be maximum, and the brightness of the luminous unit in the luminous area can be reduced by the dark part of the displayed image at the same time, even closed, so as to achieve the optimal contrast ratio, thereby reducing the brightness of the darker luminous area and reducing the power consumption of the backlight module. The scanning driving module is used for providing scanning driving signals for all the light-emitting units of the light-emitting areas so as to control the light-emitting units of all the light-emitting areas to emit light; the data updating module is used for updating PWM data before each frame of picture is displayed, so that the light-emitting brightness of the backlight module corresponds to the display content of the display panel, the light-emitting effect is improved, and the matching degree of the light-emitting brightness of the backlight module and the display content of the display panel is increased. The working time period of the data updating stage and the working time period of the scanning driving stage are at least partially overlapped, so that the time of pausing scanning of the luminous zone due to PWM data updating can be shortened, and the backlight scanning frequency is improved to a certain extent; and, shorten the time of sending out the light zone pause scanning, can reduce the probability that people's eyes discerned the pause scanning of sending out the light zone, when the time of sending out the light zone pause scanning was short enough, people's eyes just can't discern, therefore for prior art, improved the problem of the scintillation of being shaded that leads to because data update, improved backlight unit's light-emitting effect and light-emitting quality.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present invention;
fig. 2 is a schematic view of a scanning driving method of a backlight module according to an embodiment of the invention;
FIG. 3 is a schematic diagram of another scanning driving method of a backlight module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another scanning driving method of a backlight module according to an embodiment of the present invention;
FIG. 5 is a schematic plan view of another backlight module according to an embodiment of the present invention;
FIG. 6 is a schematic view of another scanning driving method of a backlight module according to an embodiment of the present invention;
FIG. 7 is a schematic plan view of another backlight module according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 9 is a schematic sectional view taken along line a-a' of fig. 8.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present invention, fig. 2 is a schematic view of a scanning driving method of a backlight module according to an embodiment of the present invention, in the scanning driving method of a backlight module according to the present embodiment, a backlight module 000 includes a plurality of light emitting areas 10, a scanning driving module 20, and a data updating module 30, the light emitting areas 10 include at least one light emitting unit 101, and the scanning driving module 20 and the data updating module 30 are electrically connected to the light emitting units 101, respectively;
the scanning driving method of the backlight module 000 comprises a scanning driving stage E and a plurality of data updating stages F;
in the scan driving phase E, the scan driving module 20 provides a scan driving signal to the light emitting region 10;
in the data update phase F, the data update module 30 provides a data update driving signal to the light emitting region 10;
working time period F of data updating phaseTWorking time period E of scanning driving phaseTAt least partially overlapping.
Specifically, in the scanning driving method of the backlight module 000 of the embodiment, the backlight module 000 includes a plurality of light emitting areas 10, so that each light emitting area 10 can be individually controlled by using a local Dimming technique to perform local backlight driving lighting. The light-emitting area 10 at least comprises one light-emitting unit 101, the brightness of each different light-emitting area 10 can be adjusted according to the brightness of the display image of the display panel, that is, the brightness of the light-emitting area 10 of the high-brightness part in the display image can be maximized, and the brightness of the light-emitting unit 101 in the light-emitting area 10 can be reduced or even closed by the dark part of the display image, so that the optimal contrast ratio is achieved, the brightness of the darker light-emitting area is reduced, and the power consumption of the backlight module is reduced. The scanning driving module 20 and the data updating module 30 are electrically connected to the light emitting units 101, respectively, and the scanning driving module 20 is configured to provide a scanning driving signal to each light emitting unit 101 of the light emitting region 10 to control the light emitting unit 101 of each light emitting region 10 to emit light; the data updating module 30 is configured to update the PWM data before each frame of image is displayed, so that the light-emitting brightness of the backlight module 000 corresponds to the display content of the display panel, thereby improving the light-emitting effect and increasing the matching degree between the light-emitting brightness of the backlight module 000 and the display content of the display panel.
The driving mode of the direct type backlight module is divided into a one-to-one mode and a scanning mode, wherein the driving mode of the scanning type backlight module is suitable for scenes with more backlight partitions, and the hardware scale can be effectively reduced. The driving structure of the scanning backlight module divides all the light source partitions into rows and columns, the partitions in the same column share a current control input and output, and the light sources of all the partitions are lightened line by line in a line scanning mode. In the driving method of the scanning backlight module, because the LED light sources are scanned line by line, for the LED light sources in the same region, in one scanning period, the time for turning on the LED light sources does not exceed the scanning time of one line, and the other times are all turned off, the scanning frequency cannot be too low, otherwise, the backlight is easy to flicker. In addition, in the driving timing sequence of the conventional scanning backlight module, because of the local Dimming technology, the backlight source turn-on ratio of each partition is changed along with the change of the display content of the display panel, so that the PWM data needs to be updated before the next frame is displayed, otherwise, the backlight brightness does not correspond to the display content of the display panel, and abnormal display occurs. Therefore, each frame needs to be divided into a part of time for updating the PWM data. During the period of updating the PWM data, all the LED light sources are in a closed state, namely, the scanning of the LED light sources is suspended, so that a low-frequency component is introduced into the scanning frequency of the LED light sources, the backlight flicker problem is further caused, and the longer the backlight scanning suspension time is, the more obvious the flicker phenomenon is.
Therefore, in order to solve the above problem, the scanning driving method of the backlight module 000 of the embodiment includes a scanning driving phase E and a plurality of data updating phases F (in fig. 2, the working time of the data updating phases F is represented by the filled stripe structures); the scan driving phase E is a phase in which the scan driving module 20 provides a scan driving signal to the light emitting region 10, the data updating phase F is a phase in which the data updating module 30 provides a PWM data updating driving signal to the light emitting region 10, and the present embodiment is a working time period F of the data updating phaseTWorking time period E of scanning driving phaseTThe arrangement is at least partially overlapped, so that the time of pause scanning of the luminous zone 10 caused by the update of the PWM data can be shortened, and the backlight scanning frequency is improved to a certain extent; in addition, the pause scanning time of the light emitting region 10 is shortened, the probability that human eyes recognize the pause scanning of the light emitting region 10 can be reduced, and when the pause scanning time of the light emitting region 10 is short enough, human eyes cannot recognize the pause scanning time, so that compared with the prior art, the problem of backlight flickering caused by data updating is solved, and the light emitting effect and the light emitting quality of the backlight module 000 are improved.
It should be noted that fig. 1 of this embodiment only schematically illustrates an electrical connection structure between the scan driving module 20 and the data updating module 30 and the light emitting unit 101, and in specific implementation, the arrangement positions and the arrangement structures of the scan driving module 20 and the data updating module 30 may be set according to actual situations, which is not limited in this embodiment. It should be further noted that, in order to more clearly illustrate the technical solution of the present embodiment, fig. 2 illustrates a scanning driving method corresponding to the backlight module 000 in two adjacent frames (one Frame is 1Frame) of the display panel, in fig. 2, G1, G2, G3, … …, and Gn indicate n light emitting areas 10 included in the backlight module, and timing signals corresponding to G1, G2, G3, … …, and Gn are scanning driving signals provided by the scanning driving module 20 to each light emitting area 10.
In some optional embodiments, please refer to fig. 3, fig. 3 is a schematic diagram of another scanning driving method of a backlight module according to an embodiment of the present invention, in which a scanning driving phase E includes M sub-phases E1, M is greater than or equal to 2 and is an integer, the M sub-phases E1 at least includes an adjacent a-th sub-phase and a B-th sub-phase, and a scanning driving operation of the B-th sub-phase is performed after the a-th sub-phase completes the scanning driving operation, where a is greater than or equal to 1 and less than or equal to B and is an integer;
operating period E1 of the Mth sub-phaseTAt least partially associated with the working period F of the data update phaseTOverlap.
The embodiment further illustrates that the scanning driving phase E of the backlight module 000 includes M sub-phases E1, where M is greater than or equal to 2 and is an integer, that is, each scanning driving phase E includes at least two sub-phases E1, so that as many sub-phases E1 are included in one frame time of the display panel as possible, that is, the backlight scanning frequency is increased, so that backlight flicker is avoided as much as possible, and in one frame time of display of the display panel, the more sub-phases E1 included in the backlight module 000, the shorter the interval time between two adjacent sub-phases E1 is, and when the interval time is shorter than the time that can be recognized by human eyes, the less obvious phenomenon of backlight flicker is caused. The embodiment further defines the operation time period E1 of the Mth sub-stageTAt least partially associated with the working period F of the data update phaseTOverlapping, because the M sub-phases E1 of the present embodiment at least include the adjacent a-th sub-phase and B-th sub-phase, the scan driving operation of the B-th sub-phase is performed after the a-th sub-phase completes the scan driving operation, wherein a is greater than or equal to 1 and less than or equal to B and is an integer, the M sub-phases E1 of the present embodiment sequentially perform the scan according to the sequence of the first sub-phase, the second sub-phase, … … and the M-th sub-phaseIn operation, the mth sub-phase is the last scanning sub-phase E1 in the scanning driving phase E of the backlight module, i.e. the time of the last backlight scanning period in the display frame time of the display panel is at least partially equal to the operation time period F of the data updating phaseTAnd the PWM data information is updated before the display frame of the next frame is scanned and driven after the display content of the display panel starts to be switched, so that the emergent brightness of the backlight module 000 can be further corresponding to the display content of the display panel, the emergent light effect is improved, and the matching degree of the emergent brightness of the backlight module 000 and the display content of the display panel is increased.
It should be noted that, in order to more clearly illustrate the technical solution of the present embodiment, fig. 3 illustrates a scanning driving method corresponding to the backlight module 000 within one Frame (1Frame) of the display panel, in fig. 3, G1, G2, G3, … …, Gn indicate n light emitting areas 10 included in the backlight module, and timing signals corresponding to G1, G2, G3, … …, Gn are scanning driving signals provided by the scanning driving module 20 to each light emitting area 10.
In some optional embodiments, please refer to fig. 4, fig. 4 is a schematic view of another scanning driving method of a backlight module according to an embodiment of the present invention, in the embodiment, each sub-phase E1 includes N sub-scanning phases E11, where N is an integer greater than or equal to 2; the N sub-scanning stages E11 at least comprise a C-th sub-scanning stage and a D-th sub-scanning stage which are adjacent, the scanning driving work of the D-th sub-scanning stage is carried out after the C-th sub-scanning stage finishes the scanning driving work, wherein C is more than or equal to 1 and less than or equal to D and less than or equal to M and is an integer;
starting time point F of data updating phaseT0Time point E11 corresponding to the M-th sub-phase E1 at which the first sub-scanning phase is completedT0And (4) overlapping.
The embodiment further illustrates that the scanning driving phase E of the backlight module 000 includes M sub-phases E1, and when M is greater than or equal to 2 and is an integer, each sub-phase E1 includes N sub-scanning phases E11, and N is greater than or equal to 2 and is an integer, that is, each sub-phase E1 includes at least two sub-scanning phases E11, so that one frame time of the display panel includes as many sub-phases E1 as possible,when the backlight scanning frequency is improved and backlight flicker is avoided as much as possible, each sub-stage E1 can be divided into as many sub-scanning stages E11 as possible, that is, the driving scanning of the backlight module 000 is divided into as many sub-scanning stages E11 as possible, so that the light emitting accuracy of the backlight module can be improved, and the adjustment of the brightness of different light emitting in different sub-scanning stages E11 is facilitated. The embodiment further defines the starting time point F of the data updating phaseT0Time point E11 corresponding to the M-th sub-phase E1 at which the first sub-scanning phase is completedT0For coincidence, since the N sub-scanning stages E11 of this embodiment at least include the adjacent C-th sub-scanning stage and D-th sub-scanning stage, the scanning driving operation of the D-th sub-scanning stage is performed after the C-th sub-scanning stage completes the scanning driving operation, wherein C is greater than or equal to 1 and less than or equal to D and less than or equal to M and is an integer, therefore, the N sub-scanning stages E11 of the present embodiment sequentially perform scanning operations according to the sequence of the first sub-scanning stage, the second sub-scanning stage, … … and the nth sub-scanning stage, so that the M sub-scanning stage E1 completes the first sub-scanning stage E11, that is, in the last sub-scanning stage E1 in the scanning driving stage E of the backlight module, the stage of completing the first sub-scanning stage E11 is a time point E11 at which the display panel completes the first sub-scanning stage E11 in the last backlight scanning period in one frame time.T0And the starting time point F of the data updating phaseT0Therefore, the PWM data information can be ensured to be updated after the display content of the display panel starts to be switched and before the display frame of the next frame starts to be scanned and driven, and the working time period F of the data updating stage can be increased as much as possibleTOverlap time H1 with the on-time period of the first sub-scan phase, due to the on-time period F of the data update phaseTGenerally, the same is true, so that the time H2 (as shown in fig. 4, where H1+ H2 is F) after the scanning driving phase E of the backlight module for displaying one frame of the display panel is finished and before the scanning driving phase E of the backlight module for displaying the next frame is started can be shortened as much as possibleT) Therefore, the light-emitting brightness of the backlight module 000 can be further corresponding to the display content of the display panel, the light-emitting effect is improved, and the backlight is increasedWhile the module 000 matches the luminance with the display content of the display panel, the time for suspending scanning in the light emitting region 10 due to the update of the PWM data (i.e., the time H2 after the scanning driving stage E of the backlight module for one frame display of the display panel is finished and before the scanning driving stage E of the backlight module for the next frame display is started) can be further shortened, so as to further improve the backlight scanning frequency; moreover, the pause scanning time of the light emitting region 10 is further shortened, the probability of identifying the pause scanning of the light emitting region 10 by human eyes can be further reduced, and when the pause scanning time of the light emitting region 10 is short enough, human eyes cannot identify the pause scanning time, so that compared with the prior art, the problem of backlight flicker caused by data updating is further improved, and the light emitting effect and the light emitting quality of the backlight module 000 are improved.
It should be noted that, in order to more clearly illustrate the technical solution of the present embodiment, fig. 4 illustrates a scanning driving method corresponding to the backlight module 000 within one Frame (1Frame) of the display panel, in fig. 4, G1, G2, G3, … …, and GN indicate N sub-scanning stages E11 included in the backlight module, and timing signals corresponding to G1, G2, G3, … …, and GN are scanning driving signals provided by the scanning driving module 20 in each sub-scanning stage E11.
In some optional embodiments, please refer to fig. 4 and fig. 5 in combination, fig. 5 is a schematic plan view of another backlight module according to an embodiment of the present invention, in which the light emitting regions 10 include K light emitting sub-regions 100, the light emitting sub-regions 100 are sequentially arranged along a first direction X and extend along a second direction Y, where K is N; the first direction X is vertical to the second direction Y;
the sub-phase E1 is a phase in which the scan driving module 20 sequentially provides scan driving signals to the K light-emitting sub-areas 100; the phase in which the scan driving module 20 supplies the scan driving signal to one light emitting sub-area 100 is one sub-scan phase E11.
In this embodiment, further explaining the significance of the sub-phase E1 and the sub-scanning phase E11 in the scanning driving phase E, that is, a plurality of light emitting regions 10 are arranged to include K light emitting sub-regions 100, because the light emitting sub-regions 100 are sequentially arranged along the first direction X and extend along the second direction Y, one light emitting sub-region 100 may be a row of light emitting units 101 (as shown in fig. 1), or may be two adjacent rows of light emitting units 101 (that is, two rows of light emitting units 101 simultaneously drive and scan, not shown in the drawings), or may be a plurality of adjacent rows of light emitting units 101, this embodiment is not particularly limited, but is only to explain that one sub-scanning phase E11 is a phase in which the scanning driving module 20 provides scanning driving signals to one light emitting sub-region 100, if there are K light emitting sub-regions 100, there are N sub-scanning phases E11, where K is N; the sub-phase E1 is a phase in which the scan driving module 20 sequentially provides scan driving signals to the K light-emitting sub-areas 100, that is, a sub-phase E1 is a phase in which the scan driving module 20 completes one backlight scanning operation, that is, a scanning period of the backlight module.
In some optional embodiments, please refer to fig. 6, where fig. 6 is a schematic diagram of another scanning driving method of a backlight module according to an embodiment of the present invention, in which the ending time point F of the data update stage is shown in the present embodimentT1At the time point E1N corresponding to the completion of the Nth sub-scanning stage of the Mth sub-stage E1T0And (4) overlapping.
This example further defines the end point in time FT1At the time point E1N corresponding to the completion of the Nth sub-scanning stage of the Mth sub-stage E1T0For coincidence, since the N sub-scanning stages E11 of this embodiment at least include the adjacent C-th sub-scanning stage and D-th sub-scanning stage, the scanning driving operation of the D-th sub-scanning stage is performed after the C-th sub-scanning stage completes the scanning driving operation, wherein C is greater than or equal to 1 and less than or equal to D and less than or equal to M and is an integer, therefore, the N sub-scanning stages E11 of the present embodiment sequentially perform scanning operations according to the sequence of the first sub-scanning stage, the second sub-scanning stage, … … and the nth sub-scanning stage, and then the M sub-scanning stage E1 completes the nth sub-scanning stage E11, i.e. in the last sub-scanning stage E1 in the scanning driving stage E of the backlight module, and completes the last sub-scanning stage E11, i.e. at the time point E1N when the last sub-scanning stage E11 is completed in the last backlight scanning period in one frame time displayed by the display panel.T0And the end time point F of the data updating phaseT1Is superposed fromAfter the display content of the display panel starts to be switched and before the display frame of the next frame starts to be scanned and driven, the updating of the PWM data information is finished, the work of the data updating stage and the work of finishing the scanning of the Mth sub-stage E1 are almost finished simultaneously, so that the time after the scanning driving stage E of the backlight module displayed by one frame of the display panel is finished and before the scanning driving stage E of the backlight module displayed by the next frame starts is reduced, the light emitting brightness of the backlight module 000 is further corresponding to the display content of the display panel, the light emitting effect is improved, the matching degree of the light emitting brightness of the backlight module 000 and the display content of the display panel is increased, the problem of backlight flicker caused by data updating is further improved, and the light emitting effect and the light emitting quality of the backlight module 000 are improved.
It should be noted that, in order to more clearly illustrate the technical solution of the present embodiment, fig. 6 illustrates a scanning driving method corresponding to the backlight module 000 within one Frame (1Frame) time of the display panel, in fig. 6, G1, G2, G3, … …, and GN indicate N sub-scanning stages E11 included in the backlight module, and timing signals corresponding to G1, G2, G3, … …, and GN are scanning driving signals provided by the scanning driving module 20 in each sub-scanning stage E11.
In some optional embodiments, please refer to fig. 7, fig. 7 is a schematic plane structure diagram of another backlight module according to an embodiment of the present invention, and a backlight module 111 according to the present embodiment uses the scanning driving method in the foregoing embodiments. Optionally, the backlight module 111 provided in this embodiment has the beneficial effects of the scanning driving method of the backlight module provided in the foregoing embodiments, and specific descriptions of the scanning driving method of the backlight module in the foregoing embodiments may be specifically referred to, and no further description is given in this embodiment.
In some optional embodiments, please continue to refer to fig. 7, in the present embodiment, the backlight module 111 is a direct-type backlight module.
The present embodiment further defines the backlight module 111 as a direct-type backlight module, that is, the whole surface of the spontaneous light source of the backlight module is disposed right below the light-emitting surface of the backlight module (not shown), so as to achieve a good light-emitting viewing angle and high light utilization efficiency. The direct type backlight module of the embodiment can greatly adjust the brightness of a light source according to the brightness of an image displayed by the display panel by using the scanning driving method of the embodiment, thereby reducing the power consumption of the backlight module, and improving the scanning frequency of the backlight module and the backlight flicker phenomenon by using the scanning driving method.
In some optional embodiments, please refer to fig. 7, in the present embodiment, the backlight module 111 includes a plurality of light emitting regions 10' sequentially arranged along the first direction X and extending along the second direction Y; wherein the first direction X is perpendicular to the second direction Y; the light emitting region 10 'includes a plurality of LED light sources 101' arranged in an array.
The present embodiment further explains a manner of disposing the Light Emitting region 10 ' of the backlight module 111, where the Light Emitting region 10 ' includes a plurality of LED Light sources 101 ' arranged in an array, the LED Light sources 101 ' use Light Emitting Diodes (LEDs) as a backlight source, and the backlight module 111 using the LED Light sources 101 ' has the advantages of being Light, thin and environmentally friendly, and thus can be widely applied in the field of liquid crystal display backlight sources.
It should be noted that, in this embodiment, a specific partitioning manner of the light emitting region 10 ' in the backlight module 111 is not specifically limited, the shape of the light emitting region 10 ' may be a strip along the first direction X, a strip along the second direction Y, or a block, and the size of the light emitting region 10 ' or the number of the LED light sources 101 ' in the light emitting region 10 ' is not limited in this embodiment, and may be selected according to actual design requirements during specific implementation.
In some optional embodiments, please continue to refer to fig. 7, in the present embodiment, the backlight module 111 includes a scan driving circuit 110, and the scan driving circuit 110 includes a driving module 1101 and a control module 1102;
the driving module 1101 is electrically connected with the control module 1102, and the driving module 1101 outputs a timing voltage signal to the control module 1102; the control module 1102 is electrically connected to the LED light sources 101 ', and the control module 1102 drives the LED light sources 101' to emit light according to the timing voltage signal.
The embodiment further explains that the backlight module 111 includes the scan driving circuit 110 and a module connection structure included in the scan driving circuit 110, the scan driving circuit 110 includes a driving module 1101 and a control module 1102, the driving module 1101 outputs different timing voltage signals to the control module 1102, and the control module 1102 drives the LED light source 101' to emit light and controls the brightness of the emitted light according to the different timing voltage signals, thereby achieving the purpose of local dimming of the backlight module 111.
It should be further noted that fig. 7 of the present embodiment is only a schematic diagram illustrating a connection frame of the driving module 1101 and the control module 1102 included in the scanning driving circuit 110, and a specific circuit connection structure in the driving module 1101 and the control module 1102 is not described in detail, and a person skilled in the art can design the driving module 1101 and the control module 1102 according to actual design requirements, and only the direct-type backlight module needs to drive and scan different light emitting areas 10' to achieve light emitting effects with different light and shade, which is not described herein again in the present embodiment.
In some optional embodiments, please refer to fig. 8 and 9, fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, fig. 9 is a schematic structural diagram of a cross section along direction a-a' of fig. 8, the display device 1000 according to this embodiment includes the backlight module 1111 in the above embodiment, optionally, further includes a display panel 0000 disposed opposite to the backlight module 1111, and optionally, the display panel 0000 is a liquid crystal display panel. Fig. 8 of the present embodiment only illustrates the display device 1000 by taking a mobile phone as an example, but it should be understood that the display device 1000 provided in the present embodiment may be other display devices 1000 having a display function, such as a computer, a television, an electronic paper, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device 1000 according to the embodiment of the present invention has the beneficial effects of the backlight module 1111 according to the embodiment of the present invention, and specific reference may be made to the specific description of the backlight module 1111 according to the above embodiments, which is not repeated herein.
By the above embodiments, the backlight module, the scanning driving method of the backlight module and the display device provided by the invention at least achieve the following beneficial effects:
in the scanning driving method of the backlight module, the backlight module comprises a plurality of luminous areas, each luminous area at least comprises one luminous unit, the brightness of each different luminous area can be adjusted according to the brightness of the image displayed by the display panel, namely, the brightness of the luminous area of the high-brightness part in the displayed image can be maximum, and the brightness of the luminous unit in the luminous area can be reduced by the dark part of the displayed image at the same time, even closed, so as to achieve the optimal contrast ratio, thereby reducing the brightness of the darker luminous area and reducing the power consumption of the backlight module. The scanning driving module is used for providing scanning driving signals for all the light-emitting units of the light-emitting areas so as to control the light-emitting units of all the light-emitting areas to emit light; the data updating module is used for updating PWM data before each frame of picture is displayed, so that the light-emitting brightness of the backlight module corresponds to the display content of the display panel, the light-emitting effect is improved, and the matching degree of the light-emitting brightness of the backlight module and the display content of the display panel is increased. The working time period of the data updating stage and the working time period of the scanning driving stage are at least partially overlapped, so that the time of pausing scanning of the luminous zone due to PWM data updating can be shortened, and the backlight scanning frequency is improved to a certain extent; and, shorten the time of sending out the light zone pause scanning, can reduce the probability that people's eyes discerned the pause scanning of sending out the light zone, when the time of sending out the light zone pause scanning was short enough, people's eyes just can't discern, therefore for prior art, improved the problem of the scintillation of being shaded that leads to because data update, improved backlight unit's light-emitting effect and light-emitting quality.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (9)
1. A scanning driving method of backlight module is characterized in that,
the backlight module comprises a plurality of light emitting areas, a scanning driving module and a data updating module, the backlight module is a direct type backlight module, the light emitting areas at least comprise a light emitting unit, and the scanning driving module and the data updating module are respectively and electrically connected with the light emitting unit;
the scanning driving method of the backlight module comprises a scanning driving stage and a plurality of data updating stages;
in the scanning driving stage, the scanning driving module provides a scanning driving signal to the light emitting area;
in the data updating stage, the data updating module provides a data updating driving signal to the light emitting area;
the working time period of the data updating phase at least partially overlaps with the working time period of the scanning driving phase;
the scanning driving stage comprises M sub-stages, M is more than or equal to 2 and is an integer, each sub-stage comprises N sub-scanning stages, and N is more than or equal to 2 and is an integer;
the starting time point of the data updating phase coincides with the time point when the Mth sub-phase completes the first sub-scanning phase.
2. The scanning driving method of backlight module as claimed in claim 1,
the M sub-stages at least comprise an A sub-stage and a B sub-stage which are adjacent, the scanning driving work of the B sub-stage is carried out after the A sub-stage finishes the scanning driving work, wherein A is more than or equal to 1 and less than or equal to B and less than or equal to M and is an integer;
the work time period of the Mth sub-phase at least partially overlaps with the work time period of the data updating phase.
3. The scanning driving method of backlight module as claimed in claim 1,
the N sub-scanning stages at least comprise a C-th sub-scanning stage and a D-th sub-scanning stage which are adjacent, the scanning driving work of the D-th sub-scanning stage is carried out after the C-th sub-scanning stage finishes the scanning driving work, wherein C is more than or equal to 1 and less than D and less than or equal to M, and the D is an integer.
4. The scanning driving method of claim 3, wherein the driving signal is a pulse signal,
the plurality of light emitting areas comprise K light emitting sub-areas which are sequentially arranged along a first direction and extend along a second direction, wherein K is equal to N; the first direction and the second direction are perpendicular;
the sub-stage is a stage in which the scanning drive module sequentially provides the scanning drive signals to the K light-emitting sub-regions; the phase in which the scan driving module supplies the scan driving signal to one of the light emitting sub-regions is one of the sub-scanning phases.
5. The method as claimed in claim 3, wherein an ending time point of the data update phase coincides with a time point when the Mth sub-phase completes the Nth sub-scanning phase.
6. A backlight module is characterized in that: the backlight module uses a scanning driving method comprising any one of claims 1 to 5.
7. The backlight module according to claim 6,
the backlight module comprises a plurality of light emitting areas which are sequentially arranged along a first direction and extend along a second direction; wherein the first direction is perpendicular to the second direction; the light emitting area comprises a plurality of LED light sources arranged in an array.
8. The backlight module according to claim 7,
the backlight module comprises a scanning driving circuit, and the scanning driving circuit comprises a driving module and a control module;
the driving module is electrically connected with the control module and outputs a time sequence voltage signal to the control module; the control module is respectively electrically connected with the LED light sources and drives the LED light sources to emit light according to the time sequence voltage signals.
9. A display device comprising the backlight module according to any one of claims 6-8.
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| CN113450719A (en) | 2020-03-26 | 2021-09-28 | 聚积科技股份有限公司 | Driving method and driving device for scanning display |
| CN113450724A (en) | 2020-03-26 | 2021-09-28 | 聚积科技股份有限公司 | Scanning display and driving device thereof |
| TWI769616B (en) * | 2020-03-26 | 2022-07-01 | 聚積科技股份有限公司 | Driving method and driving device of scanning display |
| CN113450725A (en) | 2020-03-26 | 2021-09-28 | 聚积科技股份有限公司 | Scanning display and driving device and driving method thereof |
| CN113450726A (en) | 2020-03-26 | 2021-09-28 | 聚积科技股份有限公司 | Scanning display and driving device and driving method thereof |
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