CN109509437B - 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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- CN109509437B CN109509437B CN201811600067.3A CN201811600067A CN109509437B CN 109509437 B CN109509437 B CN 109509437B CN 201811600067 A CN201811600067 A CN 201811600067A CN 109509437 B CN109509437 B CN 109509437B
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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
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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 is a direct type backlight module, the backlight module comprises a scanning driving circuit and a plurality of light emitting areas, and the light emitting areas comprise a plurality of light sources which are arranged in an array; the scanning driving circuit comprises a driving module and a control module; the light emitting areas at least comprise a first light emitting area and a second light emitting area, and the gray scale of the first light emitting area is larger than that of the second light emitting area; in one frame time, the scanning time of the first light-emitting area is longer than that of the second light-emitting area. The display device comprises a display panel and the backlight module which are oppositely arranged. The scanning driving method of the backlight module comprises the step that in a frame time, a driving module of a scanning driving circuit outputs a time sequence voltage signal to a control module. The invention can not only avoid the waste of scanning time, but also improve the brightness of the backlight module in a lighting task area and improve the display effect of the display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module, a scanning driving method of the backlight module and a display device.
Background
In the conventional display device, the display panel is mainly divided into two mainstream technologies of a liquid crystal display panel and an organic self-luminous display panel. The liquid crystal display panel forms an electric field capable of controlling the deflection of liquid crystal molecules by providing proper voltage to the pixel electrode and the common electrode, and further controls the transmission of light rays to realize the display function of the display panel; the organic self-luminous display panel adopts an organic electroluminescent material, and when current passes through the organic electroluminescent material, the luminescent material can emit light, so that the display function of the display panel is realized. The backlight module is one of the key components of the 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 prior art is generally divided into an edge-light type backlight module and a direct-light type backlight module, wherein the light source of the edge-light 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, and has the characteristics of light weight, thinness, narrow frame 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.
In the prior art, for the direct-type backlight module, since the backlight module generally scans according to a fixed driving timing sequence, no matter whether the light source of the corresponding area needs to be turned on, the area still occupies the scanning time, and the scanning time is completely wasted.
Therefore, it is an urgent technical problem for those skilled in the art to provide a backlight module, a scanning driving method of the backlight module, and a display device, which can increase the scanning time of a lighting task region by fully utilizing the scanning time of a non-lighting task region according to whether different regions of the backlight module have different lighting tasks or not, thereby avoiding the waste of the scanning time, and simultaneously improving the brightness of the backlight module in the lighting task region, and improving the display effect of the display device.
Disclosure of Invention
In view of the above, the present invention provides a backlight module, which includes a scan driving circuit; the backlight module is a direct type backlight module, the backlight module comprises a plurality of light emitting areas, the light emitting areas comprise a plurality of light sources which are arranged in an array along a first direction and a second direction, and the first direction and the second direction are vertical; the scanning driving circuit comprises a driving module and a control module, wherein 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 light emitting areas and drives the light emitting areas to emit light according to the time sequence voltage signals; the light emitting areas at least comprise a first light emitting area and a second light emitting area, and the gray scale of the first light emitting area is larger than that of the second light emitting area; in a frame time, the scanning time of the first light-emitting area is longer than that of the second light-emitting area; the scanning time of the first light-emitting area is the completion time of inputting the time sequence voltage signal to the first light-emitting area by the control module, and the scanning time of the second light-emitting area is the completion time of inputting the time sequence voltage signal to the second light-emitting area by the control module; one frame time is the time when the scanning driving circuit finishes inputting the time sequence voltage signal to the luminous zone once.
Based on the same idea, the invention also provides a display device, which comprises a display panel and the backlight module which are oppositely arranged.
Based on the same idea, the invention also provides a scanning driving method of the backlight module, which comprises the following steps: in a frame time, a driving module of the scanning driving circuit outputs a time sequence voltage signal to a control module; in a first scanning time period, the control module inputs a time sequence voltage signal to the first light-emitting area to drive the first light-emitting area to emit light; in a second scanning time period, the control module inputs a time sequence voltage signal to the second light-emitting area to drive the second light-emitting area to emit light; the gray scale of the first light emitting area is larger than that of the second light emitting area, and the first scanning time period is larger than the second scanning time period.
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:
the backlight module is a direct type backlight module, the backlight module is divided into a plurality of light emitting areas according to actual use requirements, the light emitting areas at least comprise a first light emitting area and a second light emitting area, and the gray scale of the first light emitting area is larger than that of the second light emitting area in a time period. Because the gray scale of the first light-emitting area is larger than that of the second light-emitting area, in a time period in which the scanning driving circuit completes inputting the time sequence voltage signal to the light-emitting areas once, the scanning driving circuit of the backlight module can reduce the time for inputting the time sequence voltage signal to the second light-emitting area by the control module, namely reduce the scanning time of the scanning driving circuit to the second light-emitting area, and increase the scanning time of the scanning driving circuit to the second light-emitting area to the first light-emitting area with larger gray scale, namely increase the time for inputting the time sequence voltage signal to the first light-emitting area by the control module, namely increase the charging time to the first light-emitting area, so that the gray scale of the first light-emitting area can be effectively improved, thereby fully utilizing the scanning time of a non-lighting task area or a small gray scale area to increase the scanning time of a lighting task area or a high gray scale area, when avoiding scanning time extravagant, can also promote backlight unit and being having a light the luminance in task area, promote display device's display effect.
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 light-emitting area dividing structure of a backlight module and a scanning driving timing diagram corresponding to the light-emitting area dividing structure according to an embodiment of the present invention;
FIG. 3 is a schematic plan view of another backlight module according to an embodiment of the present invention;
FIG. 4 is a timing diagram of a light-emitting area dividing structure of another backlight module according to an embodiment of the present invention and a scanning driving timing chart corresponding thereto;
FIG. 5 is a timing diagram of a light-emitting area dividing structure of another backlight module according to an embodiment of the present invention and a scanning driving timing chart corresponding thereto;
FIG. 6 is a timing diagram of a light-emitting area dividing structure of another backlight module according to an embodiment of the present invention and a scanning driving timing chart corresponding thereto;
FIG. 7 is a schematic plan view of another backlight module according to an embodiment of the present invention;
FIG. 8 is a schematic plan view illustrating another backlight module according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 10 is a schematic sectional view taken along line A-A' of FIG. 9;
fig. 11 is a schematic block diagram of a flow of a scanning driving method of a backlight module according to an embodiment of the present invention.
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, fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present invention, in which a backlight module 0000 includes a scan driving circuit 10; the backlight module 0000 is a direct type backlight module, the backlight module 0000 includes a plurality of light emitting areas 20, the light emitting areas 20 include a plurality of light sources 201 arranged in an array along a first direction X and a second direction Y, wherein the first direction X is perpendicular to the second direction Y; it should be noted that, when the plurality of light sources 201 are arranged in a row and a plurality of columns (i.e. only one in the second direction Y and a plurality in the first direction X) or in a row and a plurality of rows (i.e. only one in the first direction X and a plurality in the second direction Y), the light sources may also be arranged in an array as described in the present embodiment.
The scanning driving circuit 10 comprises a driving module 101 and a control module 102, wherein the driving module 101 is electrically connected with the control module 102, and the driving module 101 outputs a time sequence voltage signal to the control module 102; the control module 102 is electrically connected to the light emitting areas 20, and the control module 102 drives the light emitting areas 20 to emit light according to the timing voltage signals;
the light emitting zone 20 at least comprises a first light emitting zone 21 and a second light emitting zone 22, and the gray scale of the first light emitting zone 21 is greater than that of the second light emitting zone 22;
in one frame time, the scanning time of the first light emitting zone 21 is longer than that of the second light emitting zone 22; the scanning time of the first light-emitting area 21 is the completion time of the control module 102 inputting the timing voltage signal to the first light-emitting area 21, and the scanning time of the second light-emitting area 22 is the completion time of the control module 102 inputting the timing voltage signal to the second light-emitting area 22; one frame time is the time when the scan driving circuit 10 completes one time of inputting the timing voltage signal to the light emitting region 20.
Specifically, the backlight module 0000 provided in this embodiment is a direct-type backlight module, that is, the plurality of spontaneous light sources 201 arranged in an array along the first direction X and the second direction Y of the backlight module 0000 are disposed right below the light emitting surface of the backlight module 0000, the backlight module 0000 is divided into a plurality of light emitting zones 20 according to actual use requirements, the light emitting zones include at least a first light emitting zone 21 and a second light emitting zone 22, and the gray scale of the first light emitting zone 21 is greater than the gray scale of the second light emitting zone 22 in a time period. Since the gray scale of the first light-emitting area 21 is larger than that of the second light-emitting area 22, in a time period in which the scan driving circuit 10 completes inputting the timing voltage signal to the light-emitting area 20 once, the scan driving circuit 10 of the backlight module 0000 can reduce the time for the control module 102 to input the timing voltage signal to the second light-emitting area 22, i.e. reduce the scanning time of the scan driving circuit 10 to the second light-emitting area 22, and increase the scanning time of the scan driving circuit 10 to the second light-emitting area 22 to the first light-emitting area 21 with a larger gray scale, i.e. increase the time for the control module 102 to input the timing voltage signal to the first light-emitting area 21, i.e. increase the charging time to the first light-emitting area 21, so that the gray scale of the first light-emitting area 21 can be more effectively increased, thereby fully utilizing the scanning time of the non-lighting task area or the area with a smaller gray scale (i.e. the second light-emitting area 22), the scanning time of the lighting task area or the area with higher gray scale (namely the first light-emitting area 21) is increased, the waste of the scanning time is avoided, the brightness of the backlight module 0000 in the lighting task area can be improved, and the display effect of the display device is improved. Therefore, in the embodiment, by increasing the scanning time of the first light emitting region 21 with a large gray scale, decreasing the scanning time of the second light emitting region 22 with a small gray scale, and increasing the decreased scanning time of the second light emitting region 22 to the scanning time of the first light emitting region 21, the scanning timing sequence of the scanning driving circuit 10 is fully utilized on the premise of not increasing the scanning time of the whole driving cycle, so that the light emitting region 20 with a large gray scale of the backlight module 0000 can achieve higher light output brightness.
To more clearly illustrate the technical solution of the embodiment of the present invention, please refer to fig. 2, fig. 2 is a light emitting area dividing structure of a backlight module and a scanning driving timing chart corresponding to the light emitting area dividing structure, according to the embodiment of the present invention, fig. 2 of the present embodiment drives and scans the backlight module 0000 by adopting a line-by-line scanning driving manner, that is, each light emitting area 20 includes at least one line of light sources 201. It should be noted that, in fig. 2, the gray scale size of the light emitting region is represented by the packing density of the rectangular squares, the packing density represents that the gray scale is small, and the packing density represents that the gray scale is large, and fig. 2 also includes other normal light emitting regions (not numbered) having a plurality of gray scales between the first light emitting region 21 and the second light emitting region 22. Since the gray scale of the first light-emitting region 21 is greater than the gray scale of the second light-emitting region 22, the scanning time of the second light-emitting region 22 is decreased, and the decreased time is added to the timing signal of the first light-emitting region 21, wherein if T is the scanning time of the normal light-emitting region, and T is the decreased scanning time of the second light-emitting region 22, i.e. the increased scanning time of the first light-emitting region 21, the scanning time of the first light-emitting region 21 is T + T, and the scanning time of the second light-emitting region 22 is T-T, as shown in fig. 2.
It should be noted that in the present embodiment, the scanning time is changed by changing the completion time of inputting the high potential pulse signal to the light emitting region 20 by the control module 102, specifically, the Host (Host end) controls the Microprocessor (MCU) to calculate the lighting time required by each light emitting region corresponding to a plurality of light emitting regions of the backlight module according to the data of the to-be-displayed frame of the display device, and the control module 102 changes the frequency of the scanning clock signal, so that the control module 102 outputs the driving timing sequence of the scanning pulse width change to the light emitting region 20 to change the scanning time of different light emitting regions 20.
It should be further noted that, in this embodiment, a specific partitioning manner of the light emitting region 20 in the backlight module 0000 is not specifically limited, the shape of the light emitting region 20 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 20 or the number of the light sources 201 in the light emitting region 20 is not limited in this embodiment, and may be selected according to actual design requirements in specific implementation.
It should be further noted that fig. 1 of the present embodiment is only a schematic diagram illustrating a connection frame of the driving module 101 and the control module 102 included in the scanning driving circuit 10, and a specific circuit connection structure in the driving module 101 and the control module 102 is not described in detail, and a person skilled in the art can design the driving module 101 and the control module 102 according to actual design requirements, and only the direct-type backlight module 000 needs to be able to drive and scan different light emitting areas 20 to achieve displaying different gray scales, which is not described herein again in the present embodiment.
In some optional embodiments, please refer to fig. 3, fig. 3 is a schematic plan view illustrating another backlight module according to an embodiment of the present invention, in this embodiment, the scan driving circuit 10 further includes a multiplexer 103, an input terminal of the multiplexer 103 is electrically connected to the driving module 101 and the control module 102, respectively, and an output terminal of the multiplexer 103 is electrically connected to the light emitting region 20.
This embodiment further illustrates another structure of the scan driving circuit 10, that is, the scan driving circuit 10 further includes a multiplexer 103, input terminals of the multiplexer 103 are electrically connected to the driving module 101 and the control module 102, respectively, output terminals of the multiplexer 103 are electrically connected to the light emitting region 20, the driving module 101 (usually an external control microprocessor MCU) outputs the switch codes to the multiplexer 103 in real time, so as to control the internal switch circuit to switch to the corresponding input terminal, therefore, a multiplexing circuit 103 controlled by the control module 102 is added between the control module 102 and the light emitting region 20 of the scan driving circuit 10, the pulses scanned in sequence can be gated and output according to different brightness requirements of the light emitting areas 20, and a driving time sequence with the changed number of scanning pulses is output, so that the scanning time of different light emitting areas 20 is changed.
Specifically, in the actual design process, the control module 102 outputs the driving timing sequence of the scan pulse width variation to the light emitting region 20, which is difficult to implement with the current hardware architecture, so in this embodiment, a multi-way gating circuit 103 controlled by the control module 102 is further added between the control module 102 and the light emitting region 20 of the scan driving circuit 10, and according to the calculated lighting time required by each light emitting region, the driving module 101 outputs a switch code to the multi-way gating circuit 103 in real time, controls the internal switch circuit to be correspondingly switched to the corresponding input terminal, and then the control module 102 controls the multi-way gating circuit 103 to provide different numbers of lighting pulse widths (each pulse width is equal) to each light emitting region, so as to adjust the distribution of the lighting time of the whole light emitting regions, and change the scanning time of different light emitting regions. Therefore, the scan driving circuit 10 provided in this embodiment is not only easy to implement, but also achieves the same technical effect of adjusting the scan time of different light emitting areas.
In some optional embodiments, please refer to fig. 3 and 4 in combination, fig. 4 is a light emitting area dividing structure of another backlight module and a scanning driving timing chart corresponding to the light emitting area dividing structure, according to an embodiment of the present invention, in this embodiment, the backlight module further includes a third light emitting area 23, and a gray scale of the third light emitting area 23 is 0; the scan driving of the third light emitting region 23 is not turned on for one frame time.
In this embodiment, it is further explained that when the backlight module further includes the third light emitting region 23, and the gray scale of the third light emitting region 23 is 0, then in a frame time, the scanning driving of the third light emitting region 23 may not be turned on, that is, the scanning time for the third light emitting region 23 is set to 0, and the scanning time is increased to the light emitting region 20 with the largest gray scale or the light emitting regions 20 with larger gray scales, so that the scanning timing sequence of the scanning driving circuit 10 may be more fully utilized on the premise that the scanning time of the whole driving period is not increased, so that the light emitting region 20 with the larger gray scale of the backlight module may achieve higher light output brightness, and thus the display device using the backlight module may achieve better display effect.
It should be noted that, in order to more clearly describe the technical solution of the present embodiment, fig. 4 of the present embodiment drives and scans the backlight module by adopting a progressive scanning driving manner, that is, each light emitting area 20 includes at least one row of light sources 201. It should be noted that, in fig. 4, the gray scale size of the light emitting region is represented by the packing density of the rectangular squares, the packing density represents that the gray scale is small, and the packing density represents that the gray scale is large, and fig. 4 also includes other normal light emitting regions (not numbered) having a plurality of gray scales between the first light emitting region 21 and the third light emitting region 23. Since the gray scale of the third light emitting region 23 is 0, i.e. the third light emitting region is in a completely black state, the scanning time of the third light emitting region 23 is set to 0, and the time for scanning the third light emitting region 23 is added to the timing signal of the first light emitting region 21, so that the scanning time of the first light emitting region 21 is further increased, as shown in fig. 4.
In some alternative embodiments, with continued reference to fig. 3 and 4, in the present embodiment, the scanning time t1 of the first light-emitting region 21 is twice the scanning time t of the second light-emitting region 22.
In this embodiment, it is further explained that the backlight module further includes a third light emitting region 23 with a gray scale of 0, when the scanning time of the third light emitting region 23 is set to 0, the time that the third light emitting zone 23 is originally scanned is added to the timing signal of the first light emitting zone 21, so that after the scanning time of the first light-emitting region 21 is further increased, with respect to the second light-emitting region 22 (here, the light-emitting region driven by the normal scanning time t, i.e., the light-emitting region having the gray scale size between the first light-emitting region 21 and the third light-emitting region 23), since the time for which the third light emitting region 23 is originally scanned is added to the timing signal of the first light emitting region 21, so that the scanning time t1 of the first light emitting zone 21 is changed to the sum of the time t of its original normal scanning and the time t of the normal scanning increased from the third light emitting zone 23, i.e. the scanning time t1 of the first light emitting zone 21 is twice the scanning time t of the second light emitting zone 22.
In some optional embodiments, please refer to fig. 3 and 5 in combination, fig. 5 is a light emitting area dividing structure and a corresponding scan driving timing chart of another backlight module according to an embodiment of the present invention, in this embodiment, the backlight module further includes a fourth light emitting area 24, a gray scale of the fourth light emitting area 24 is greater than a gray scale of the third light emitting area 23 and less than a gray scale of the second light emitting area 22, and a scan time t4 of the fourth light emitting area 24 is less than a scan time t of the second light emitting area 22; the scanning time t4 of the fourth light emitting area 24 is the completion time of the control module 102 inputting the timing voltage signal to the fourth light emitting area 24.
This embodiment further explains that when the backlight module further includes a fourth light-emitting region 24, and the gray scale of the fourth light-emitting region 24 is larger than the gray scale of the third light-emitting region 23 and smaller than the gray scale of the second light-emitting region 22, i.e., the brightness of the fourth light-emitting region 24 is darker than the normal region, but not a full black state, then within one frame time, the scan time t4 for the fourth light emitting area 24 may be set to be less than the scan time t for the second light emitting area 22, and the reduced scanning time of the fourth light emitting region 24 can be increased to the light emitting region 20 with the highest gray scale capable of achieving higher light emitting brightness or other light emitting regions 20 with larger gray scale, therefore, on the premise of not increasing the scanning time of the whole driving period, the scanning time sequence of the scanning driving circuit 10 is more fully utilized, the light emitting region 20 with large gray scale of the backlight module can achieve higher light emitting brightness, and the display device using the backlight module achieves better display effect.
It should be noted that, in order to more clearly describe the technical solution of the present embodiment, fig. 4 of the present embodiment drives and scans the backlight module by adopting a progressive scanning driving manner, that is, each light emitting area 20 includes at least one row of light sources 201. It should be noted that, in fig. 5, the gray scale of the light emitting region 20 is represented by the packing density of the rectangular squares, the packing density represents that the gray scale is small, the packing density represents that the gray scale is large, fig. 5 also includes a plurality of other normal light emitting regions (not numbered in the figure) with the gray scale between the first light emitting region 21 and the fourth light emitting region 24, because the gray scale of the fourth light emitting region 24 is larger than the gray scale of the third light emitting region 23 and smaller than the gray scale of the second light emitting region 22, that is, the brightness of the fourth light emitting region 24 is darker than the normal region but not in a completely black state, the scanning time t4 of the fourth light emitting region 24 is set to be smaller than the scanning time t of the second light emitting region 22, and the reduced scanning time of the fourth light emitting region 24 can be increased to the light emitting region 20 with the largest gray scale or the light emitting regions 20 with larger gray scales, so as to further increase the scanning time of the first light emitting region 21, a timing diagram is shown in fig. 5.
In some alternative embodiments, please continue to refer to fig. 3 and fig. 5 in combination, in this embodiment, the scanning time t1 of the first light-emitting region 21 is t + (t-t4), where t is the scanning time of the second light-emitting region 22, and t4 is the scanning time of the fourth light-emitting region 24.
In this embodiment, it is further explained that the backlight module further includes a fourth light emitting region 24 with a gray scale larger than that of the third light emitting region 23 and smaller than that of the second light emitting region 22, when the scanning time of the fourth light emitting region 24 is set to be smaller than the scanning time t of the second light emitting region 22, the reduced scanning time of the fourth light emitting region 24 is added to the timing signal of the first light emitting region 21, so that after the scanning time of the first light emitting region 21 is further increased, compared to the second light emitting region 22 (here, the light emitting region driven by the normal scanning time t, i.e., the normal light emitting region with a gray scale size between the first light emitting region 21 and the fourth light emitting region 24), the reduced scanning time (t-t4) of the fourth light emitting region 24 is added to the timing signal of the first light emitting region 21, so that the scanning time t1 of the first light emitting region 21 is changed to the original normal scanning time t of the first light emitting region and the scanning time (t-t4) of the fourth light emitting region 24 is increased ) The sum, i.e., the scanning time t1 of the first light-emitting region is t + (t-t4), where t is the scanning time of the second light-emitting region, and t4 is the scanning time of the fourth light-emitting region.
In some optional embodiments, please refer to fig. 3 and 6 in combination, fig. 6 is a light emitting area dividing structure of a backlight module and a scanning driving timing chart corresponding to the same, in this embodiment, the light emitting areas of the backlight module include a first light emitting area 21, a second light emitting area 22, a third light emitting area 23, and a fourth light emitting area 24, wherein the gray scale of the third light emitting area is 0, the gray scale of the first light emitting area 21 is greater than the gray scale of the second light emitting area, the gray scale of the second light emitting area 22 is greater than the gray scale of the fourth light emitting area 24, that is, the third light emitting area 23 is in a full black state, the second light emitting area 22 is a normal luminance area, the first light emitting area 21 is a maximum luminance area, according to the technical solution of this embodiment, the scanning time of the third light emitting area 23 can be set to 0, the scanning time of the second light emitting area is a normal scanning time t, and the scanning time of the fourth light emitting area 24 is t4 less than the normal scanning time t, and the reduced scanning time (t-t4) of the fourth light emitting region 24 and the reduced scanning time t of the third light emitting region 23 are both increased to the first light emitting region 21, so that the scanning time t1 of the first light emitting region 21 is t + (t-t4) + t, and thus the scanning time of the non-lighting task region (i.e., the third light emitting region 23) and the gray scale smaller region (i.e., the fourth light emitting region 24) can be further utilized to increase the scanning time of the gray scale higher region (i.e., the first light emitting region 21), thereby avoiding the waste of the scanning time, and simultaneously improving the brightness of the backlight module in the lighting task region, and improving the display effect of the display device.
In some alternative embodiments, with reference to fig. 1, in the present embodiment, the light emitting areas 20 respectively extend along the first direction X on a plane parallel to the backlight module.
Referring to fig. 7, fig. 7 is a schematic plan view illustrating another backlight module according to an embodiment of the present invention, in which a plurality of light-emitting areas 20 extend along a second direction Y on a plane parallel to the backlight module.
Referring to fig. 8, fig. 8 is a schematic plan view of another backlight module according to an embodiment of the present invention, in which a plurality of light emitting regions 20 are distributed in a block-shaped array on a plane parallel to the backlight module.
The present embodiment further illustrates a setting manner of the light emitting regions 20 in the backlight module, where the light emitting regions 20 may be respectively extended along the first direction X on a plane parallel to the backlight module, may also be respectively extended along the second direction Y, and may also be distributed in a block array, and the present embodiment is not particularly limited, as long as the backlight module scans and drives the light emitting regions 20 in the driving and scanning manner of the present embodiment, so as to fully utilize the scanning time of the non-lighting task area or the area with smaller gray scale to increase the scanning time of the lighting task area or the area with higher gray scale, thereby avoiding the waste of the scanning time, improving the brightness of the backlight module in the lighting task area, and improving the display effect of the display device, which are within the protection scope of the embodiment of the present invention.
In some optional embodiments, please refer to fig. 9 and 10, fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, fig. 10 is a schematic structural diagram of a cross section along direction a-a' of fig. 9, and the display device 1000 according to this embodiment includes a display panel 1111 and a backlight module 0000 according to the above embodiment, which are disposed oppositely. Optionally, the display panel 1111 is a liquid crystal display panel.
The display device 1000 in the embodiment of fig. 9 is described by taking a mobile phone as an example, but it should be understood that the display device 1000 provided in the embodiment of the present invention 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 provided by the embodiment of the present invention has the beneficial effect of the backlight module 0000 provided by the embodiment of the present invention, that is, the backlight module 0000 of the embodiment can improve the brightness of the backlight module 0000 in the bright task area while avoiding the scanning time waste, so that the contrast of the display device 1000 using the backlight module 0000 is improved, and a better display effect is achieved.
In some optional embodiments, please refer to fig. 1 and fig. 11 in combination, where fig. 11 is a schematic flow chart of a scanning driving method of a backlight module according to an embodiment of the present invention, the embodiment provides a scanning driving method of a backlight module, including:
301: in a frame time, the driving module 101 of the scan driving circuit 10 outputs a timing voltage signal to the control module 102;
302: in a first scanning time period, the control module 102 inputs a time sequence voltage signal to the first light emitting area 21 to drive the first light emitting area 21 to emit light;
303: in the second scanning period, the control module 102 inputs the timing voltage signal to the second light-emitting region 22 to drive the second light-emitting region 22 to emit light;
the gray scale of the first light emitting area 21 is greater than that of the second light emitting area 22, and the first scanning time period is greater than the second scanning time period.
The scanning driving method of the backlight module of the present embodiment reduces the time for the control module 102 to input the timing voltage signal to the second light-emitting region 22, that is, the scanning time of the scanning driving circuit 10 for the second light emitting region 22 with small gray scale is reduced, and the scanning time of the scanning driving circuit 10 for the second light emitting region 22 is increased to the first light emitting region 21 with larger gray scale, so that the completion time of inputting the timing voltage signal to the first light emitting region 21 by the control module 102 is increased, therefore, the scanning time of the non-lighting task area or the area with smaller gray scale (i.e. the second light emitting area 22) can be fully utilized to increase the scanning time of the lighting task area or the area with higher gray scale (i.e. the first light emitting area 21), thereby avoiding the waste of the scanning time, the brightness of the backlight module in a lighting task area can be improved, and the display effect of the display device is improved.
By the embodiment, 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:
the backlight module is a direct type backlight module, the backlight module is divided into a plurality of light emitting areas according to actual use requirements, the light emitting areas at least comprise a first light emitting area and a second light emitting area, and the gray scale of the first light emitting area is larger than that of the second light emitting area in a time period. Because the gray scale of the first light-emitting area is larger than that of the second light-emitting area, in a time period in which the scanning driving circuit completes inputting the time sequence voltage signal to the light-emitting areas once, the scanning driving circuit of the backlight module can reduce the time for inputting the time sequence voltage signal to the second light-emitting area by the control module, namely reduce the scanning time of the scanning driving circuit to the second light-emitting area, and increase the scanning time of the scanning driving circuit to the second light-emitting area to the first light-emitting area with larger gray scale, namely increase the time for inputting the time sequence voltage signal to the first light-emitting area by the control module, namely increase the charging time to the first light-emitting area, so that the gray scale of the first light-emitting area can be effectively improved, thereby fully utilizing the scanning time of a non-lighting task area or a small gray scale area to increase the scanning time of a lighting task area or a high gray scale area, when avoiding scanning time extravagant, can also promote backlight unit and being having a light the luminance in task area, promote display device's display effect.
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 backlight module is characterized in that the backlight module comprises a scanning drive circuit; the backlight module is a direct type backlight module and comprises a plurality of light emitting areas, the light emitting areas comprise a plurality of light sources which are arranged in an array mode along a first direction and a second direction, and the first direction is vertical to the second direction;
the scanning driving circuit comprises a driving module, a control module and a multi-channel gate, wherein 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 light emitting areas and drives the light emitting areas to emit light according to the time sequence voltage signals; the input end of the multi-path gate is respectively and electrically connected with the driving module and the control module, and the output end of the multi-path gate is electrically connected with the light emitting area;
the light emitting areas at least comprise a first light emitting area, a second light emitting area and a normal light emitting area, the gray scale of the first light emitting area is larger than that of the second light emitting area, and the gray scale of the normal light emitting area is located between the gray scales of the first light emitting area and the second light emitting area;
in a frame time, the scanning time of the normal light emitting area is T, the scanning time of the first light emitting area is greater than the scanning time of the second light emitting area, the scanning time of the first light emitting area is T + T, and the scanning time of the second light emitting area is T-T; the scanning time of the first light-emitting area is the completion time of the control module inputting the time sequence voltage signal to the first light-emitting area, and the scanning time of the second light-emitting area is the completion time of the control module inputting the time sequence voltage signal to the second light-emitting area; the one-frame time is the time when the scanning driving circuit finishes inputting the time sequence voltage signal to the luminous zone once.
2. The backlight module according to claim 1,
the backlight module also comprises a third light emitting area, and the gray scale of the third light emitting area is 0;
and in the frame time, the scanning drive of the third light-emitting area is not started, and the scanning time originally corresponding to the third light-emitting area is increased to a light-emitting area with the maximum gray scale or other light-emitting areas with larger gray scales.
3. The backlight module according to claim 2,
the scanning time of the first light emitting area is twice that of the second light emitting area.
4. The backlight module according to claim 2,
the backlight module also comprises a fourth light-emitting area, the gray scale of the fourth light-emitting area is greater than that of the third light-emitting area and less than that of the second light-emitting area, and the scanning time of the fourth light-emitting area is less than that of the second light-emitting area; the scanning time of the fourth light-emitting area is the completion time of inputting the time sequence voltage signal to the fourth light-emitting area by the control module.
5. The backlight module according to claim 1, wherein the light emitting areas respectively extend along the first direction on a plane parallel to the backlight module.
6. The backlight module according to claim 1, wherein the light emitting areas respectively extend along the second direction on a plane parallel to the backlight module.
7. The backlight module according to claim 1, wherein the light emitting areas are distributed in a block array on a plane parallel to the backlight module.
8. A display device comprising a display panel and a backlight module according to any one of claims 1 to 7, wherein the display panel and the backlight module are arranged oppositely.
9. A scanning driving method of a backlight module according to any one of claims 1 to 7, comprising:
in a frame time, a driving module of the scanning driving circuit outputs a time sequence voltage signal to a control module, and the time for scanning a normal light emitting area is t;
in a first scanning time period, the control module inputs the time sequence voltage signal to a first light-emitting area to drive the first light-emitting area to emit light;
in a second scanning time period, the control module inputs the time sequence voltage signal to a second light-emitting area to drive the second light-emitting area to emit light;
the gray scale of the first light emitting area is larger than that of the second light emitting area, the first scanning time period is larger than the second scanning time period, the scanning time of the first light emitting area is T + T, and the scanning time of the second light emitting area is T-T.
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