CN108986752B - Display device and control method thereof - Google Patents
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- CN108986752B CN108986752B CN201811008983.8A CN201811008983A CN108986752B CN 108986752 B CN108986752 B CN 108986752B CN 201811008983 A CN201811008983 A CN 201811008983A CN 108986752 B CN108986752 B CN 108986752B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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
- G09G3/3413—Details of control of colour illumination sources
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Abstract
The invention discloses a display device and a control method thereof, and the technical scheme is that a display panel comprises N pixel unit groups arranged along a first direction, a backlight module comprises N light-emitting unit groups arranged along the first direction, and the N light-emitting unit groups correspond to the N pixel unit groups one by one. When the display device displays a picture, the backlight module is not required to be in a lighting state as a whole, after the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the ith light emitting unit group corresponding to the ith pixel unit group is switched to the lighting state, the lighting state of each light emitting unit group can be controlled independently, and after the response of the liquid crystal molecules corresponding to each pixel unit group is completed, the light emitting unit group corresponding to the pixel unit group is lighted, so that the power consumption is reduced, and the service life of the backlight module is prolonged.
Description
Technical Field
The present invention relates to the field of image display technologies, and in particular, to a display device and a control method thereof.
Background
With the continuous development of science and technology, more and more display devices are widely applied to daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool for people at present.
The main components of a display device that perform the display function are a display panel, and a liquid crystal display panel (LCD) is one of the mainstream display panels used in display devices, and this type of display device includes: a liquid crystal display panel and a backlight module which are oppositely arranged. The liquid crystal display panel can not emit light, and backlight emitted by the backlight module is used as a light source signal.
In the prior art, when a display device displays a picture, the backlight module is generally set to be in a lighting state, which results in larger power consumption and shortens the service life of the backlight module.
Disclosure of Invention
In order to solve the above problems, the present invention provides a display device and a control method thereof, wherein when the display device displays a screen, the backlight module is not required to be entirely in a lighting state, so that power consumption is reduced, and a service life of the backlight module is prolonged.
In order to achieve the above purpose, the invention provides the following technical scheme:
a display device, comprising: the display panel comprises a first substrate, a second substrate and a liquid crystal layer clamped between the first substrate and the second substrate, wherein the liquid crystal layer comprises a plurality of liquid crystal molecules;
the display panel comprises N pixel unit groups arranged along a first direction, each pixel unit group comprises at least one row of pixel units, and N is a positive integer greater than or equal to 1;
the backlight module comprises N light emitting unit groups arranged along a first direction, and the N light emitting unit groups correspond to the N pixel unit groups one by one;
when the display device displays a picture, after the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the ith light emitting unit group corresponding to the ith pixel unit group is switched to a lighting state, and i is more than or equal to 1 and less than or equal to N.
Optionally, in the display device, the time required for displaying each frame of picture is defined as TFrameDefining the time T required for the response of the corresponding liquid crystal molecules of each pixel unit group to be completed1Defining the time for each light emitting unit group to maintain the lighting state as T2Wherein, T1+T2＝TFrame。
Optionally, in the display device, the display device further includes a control circuit, and when a current frame is displayed, the control circuit sends a first control signal to make the corresponding liquid crystal molecules of the 1 st pixel unit group respond;
when the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the control circuit receives a first feedback signal, and the control circuit sends a second control signal to sequentially control the ith light emitting unit group corresponding to the ith pixel unit group to be switched to a lighting state.
Optionally, in the display device, before the corresponding liquid crystal molecules of the 1 st pixel unit group start responding based on the next frame, the control circuit sends a third control signal to sequentially control the ith light emitting unit group corresponding to the ith pixel unit group to be switched to the off state.
Optionally, in the display device, the control circuit is configured to generate a control signal based on a scanning timing of each row of the pixel units and a response speed of the liquid crystal molecules to control the light emitting unit groups to switch between an on state and an off state.
Optionally, in the display device, the light emitting unit group includes a plurality of light emitting units, and the light emitting units are Mini-LEDs or Micro-LEDs.
Optionally, in the display device, the number of rows of pixel units in each pixel unit group is the same.
Alternatively, in the above display device, a length of each of the light emitting unit groups is not less than a length of one row of the pixel units in a second direction, wherein the second direction is perpendicular to the first direction.
The invention also provides a control method of the display device, the display device comprises a display panel and a backlight module, the display panel comprises a first substrate, a second substrate and a liquid crystal layer clamped between the first substrate and the second substrate, the liquid crystal layer comprises a plurality of liquid crystal molecules, the display panel comprises N pixel unit groups arranged along a first direction, each pixel unit group comprises at least one row of pixel units, and N is a positive integer greater than or equal to 1; the backlight module comprises N light emitting unit groups arranged along a first direction, and the N light emitting unit groups correspond to the N pixel unit groups one by one;
the control method comprises the following steps:
when the display device displays a picture, after the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the ith light emitting unit group corresponding to the ith pixel unit group is switched to a lighting state, and i is more than or equal to 1 and less than or equal to N.
Optionally, in the control method, the time required for displaying each frame of picture is defined as TFrameDefining the time T required for the response of the corresponding liquid crystal molecules of each pixel unit group to be completed1Defining the time for each light emitting unit group to maintain the lighting state as T2Wherein, T1+T2＝TFrame。
Optionally, in the control method, when a current frame is displayed, the corresponding liquid crystal molecules of the 1 st pixel unit group are made to respond by a first control signal;
the method of controlling the switching of the ith pixel cell group to the lighting state includes:
when the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the control circuit acquires a first feedback signal and generates a second control signal based on the first feedback signal, and the control circuit sequentially controls the ith light emitting unit group corresponding to the ith pixel unit group to be switched into a lighting state through the second control signal.
Optionally, in the control method, the method further includes:
and generating a third control signal before the corresponding liquid crystal molecules of the 1 st pixel unit group start responding based on the next frame, wherein the control circuit sequentially controls the ith light-emitting unit group corresponding to the ith pixel unit group to be switched into an off state.
As can be seen from the above description, in the display device and the control method thereof provided by the present invention, the display panel includes N pixel unit groups arranged along the first direction, and the backlight module includes N light emitting unit groups arranged along the first direction, where the N light emitting unit groups correspond to the N pixel unit groups one to one. When the display device displays a picture, the backlight module is not required to be in a lighting state as a whole, after the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the ith light emitting unit group corresponding to the ith pixel unit group is switched to the lighting state, the lighting state of each light emitting unit group can be controlled independently, and after the response of the liquid crystal molecules corresponding to each pixel unit group is completed, the light emitting unit group corresponding to the pixel unit group is lighted, so that the power consumption is reduced, and the service life of the backlight module is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a display principle of an LCD;
fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 3 is a top view of a display panel of the display device shown in FIG. 1;
FIG. 4 is a top view of the backlight module of the display device shown in FIG. 1;
FIG. 5 is a schematic diagram illustrating a display principle of the display device according to the embodiment of the invention;
fig. 6 is a front view of a backlight module according to an embodiment of the invention;
fig. 7 is a top view of a light source device of a backlight module according to an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As described in the background art, when a display screen is displayed in an existing display device, the backlight module is generally set to be in a lighting state, which results in large power consumption and shortens the service life of the backlight module.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a display principle of an LCD, where Liquid Crystal (LC) molecules have response delay, so that the LCD can reduce motion blur and power consumption when displaying a picture by using a Black Back Light (BBL) method shown in fig. 1.
When the picture is displayed, the picture is scanned from the first line of pixel units to the last line of pixel units of the whole LCD line by line, and one frame of picture time is divided into an LC molecule response stage and a backlight module lighting stage. A timing chart of two adjacent Frame pictures Frame1 and Frame2 is shown in fig. 1. The one-frame time sequence comprises an LC molecule response stage and a backlight module lighting stage. The display panel scanning refreshing stage is arranged before each frame time sequence.
Since the liquid crystal molecules have a set response time, in order to ensure the image display quality, the backlight is turned on only after the response of the liquid crystal molecules is completed between frames, the lighting time of the backlight is compressed, and the display brightness is weak due to the short turn-on time of the backlight. In order to increase the brightness, the dual-crystal LED is normally used, and the LED driving current is increased to improve the brightness, but the power consumption of the backlight module is increased and the cost is increased. In the prior art, the backlight is turned on after the data signals of the first row and the last row are stable, actually, the data signals of the first rows scanned by the grid electrode are stable in the scanning process, and the backlight can be turned on in the part of the area at the moment without waiting until the data signals of the last row are stable, that is, the backlight module is lighted after the response of the previous part of pixel unit rows is completed in the Frame1 time sequence of the previous Frame.
And because the backlight is started integrally after the previous part of pixel unit rows respond for a certain time, as a triangular area shown by a dotted line ellipse, the image display delay from the previous part to the row is caused, the problem of smear exists, and the image display quality is improved.
In order to solve the above problems, embodiments of the present invention provide a display device and a control method thereof, which can individually control the lighting states of the light emitting unit groups, and light the light emitting unit group corresponding to the pixel unit group after the response of the liquid crystal molecule corresponding to each pixel unit group is completed, so that the power consumption of the backlight module is low, and the service life of the backlight module is prolonged. The utilization rate of backlight can be improved, the problems of image smear and granular sensation can be prevented, the difference in color is reduced, and a better dynamic image display effect can be realized.
And after the response of the corresponding liquid crystal molecules is finished, each pixel unit group switches the corresponding light-emitting unit group to a lighting state, thereby avoiding image display delay and improving the image display quality. After the liquid crystal molecules corresponding to each pixel unit group complete response, the corresponding light emitting unit group can be opened, in a frame of picture time sequence, the opening number of the light emitting unit groups is gradually increased according to the scanning time sequence, the backlight intensity is gradually increased along with the scanning time sequence, the backlight brightness is gradually increased to be strongest, and the power consumption is reduced while the brightness of a displayed picture is ensured.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 2 to 4, fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention, fig. 3 is a top view of a display panel in the display device shown in fig. 1, and fig. 4 is a top view of a backlight module in the display device shown in fig. 1.
The display device includes a display panel 11 and a backlight module 12. The display panel 11 is an LCD. The display panel 11 includes a first substrate 111 and a second substrate 112 disposed opposite to each other, and a liquid crystal layer 113 interposed between the first substrate 111 and the second substrate 112, wherein the liquid crystal layer 113 includes a plurality of liquid crystal molecules.
It should be noted that, for convenience of describing the viewing angle relationship of the embodiments in the drawings of the present invention, the drawings are located in the same three-dimensional rectangular coordinate system O-XYZ, wherein the surface of the backlight module 12 for emitting backlight and the surface of the display panel 11 for displaying images are both parallel to the XY plane.
The display panel 11 includes N pixel unit groups 21 arranged in a first direction (X-axis forward direction), each of the pixel unit groups 21 includes at least one row of pixel units, and N is a positive integer greater than or equal to 1. The display panel 11 includes a plurality of pixel units arranged in an array to control the deflection of the liquid crystal molecules, and the structure of the pixel units is the same as that of the display units in the conventional liquid crystal display panel. The row direction of the pixel cell array is parallel to the Y axis, and the column direction of the pixel cell array is parallel to the X axis.
One pixel cell group 21 may include one or more rows of display cells. When one pixel unit group 21 has a plurality of rows of pixel units, the plurality of rows of pixel units in the same pixel unit group 21 are continuously arranged, and the same row of pixel units is located in only one pixel unit group 21.
The backlight module 12 includes N light emitting unit groups 22 arranged along a first direction, and the N light emitting unit groups 22 are in one-to-one correspondence with the N pixel unit groups 21. Each of the light emitting cell groups 22 is disposed opposite to one of the pixel cell groups 21 in a direction perpendicular to the plane of the display panel 11 (a direction parallel to the Z axis). The light emitting unit group 22 provides backlight for the corresponding pixel unit group 21, so that the pixel unit group 21 performs image display.
When the display device displays a picture, after the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the ith light emitting unit group corresponding to the ith pixel unit group is switched to a lighting state, and i is more than or equal to 1 and less than or equal to N.
Referring to fig. 6 and 7, fig. 6 is a front view of a backlight module according to an embodiment of the present invention, and fig. 7 is a top view of a light source device of the backlight module according to an embodiment of the present invention, the backlight module includes a light guide plate 31 and a light source device, the light source device includes a circuit board 32 and a plurality of light emitting units 33 arranged in an array on the circuit board 32. The light guide plate 31 is disposed toward the display panel 11, and the backlight module is a direct type backlight module.
One or a plurality of consecutive rows of light-emitting cells 33 constitute one light-emitting cell group 22. A row of light-emitting cells 33 is located in only one light-emitting cell group 22. The lighting states of the light emitting units in the light source device can be controlled by the switch circuit partitions on the circuit board 32, so that each light emitting unit group 22 in the backlight module 12 can be independently controlled to be lit. All the light emitting units 33 in the same light emitting unit group 22 may be turned on or off simultaneously, or all the light emitting units 33 may be turned on or off separately.
In the display device according to the embodiment of the present invention, in a period of displaying a frame, each light emitting unit group 22 may individually control a lighting state. In a period in which the same frame displays a picture, for any one pixel cell group 21, its corresponding light emitting cell group 22 is in an off state at least during the response of its corresponding liquid crystal molecules. After the response of the corresponding liquid crystal molecules is completed, the corresponding light emitting unit group 22 is switched from the off state to the on state, so that the whole backlight module 12 is prevented from being continuously in the on state in the time period of the frame, the power consumption is reduced, and the service life of the backlight module 12 is prolonged. Moreover, based on the scanning display principle of the liquid crystal display panel, the technical scheme of the invention can sequentially light up each light-emitting unit group 22 in a frame of picture display time period, thereby greatly reducing the power consumption and prolonging the service life of the backlight module 12 while ensuring the normal display of the pixel unit groups 21 corresponding to each light-emitting unit group 22.
In the display device according to the embodiment of the invention, the time required for displaying each frame of picture is defined as TFrameDefining the time T required for the response of the corresponding liquid crystal molecules of each pixel cell group 21 to be completed1Defining the time for each light emitting cell group 22 to maintain the lighting state as T2Wherein, T1+T2＝TFrame. Thus, after the liquid crystal molecules corresponding to each pixel unit group 21 complete the response, the corresponding light emitting unit group 22 is turned on in time, so as to avoid the problem of blurred display image caused by early or late turning on of the light emitting unit group 22.
The display device further includes a control circuit IC, which may be disposed on the display panel 11. As shown in fig. 3, the specific display panel 11 has a display area AA and a frame area BB surrounding the display area AA. The pixel units and the liquid crystal molecules are located in the display area AA. The control circuit IC is bound to the frame area BB.
When displaying the current frame, the control circuit IC sends a first control signal to make the corresponding liquid crystal molecules of the 1 st pixel unit group respond. When the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the control circuit IC receives a first feedback signal, and the control circuit IC sends a second control signal to sequentially control the ith light emitting unit group corresponding to the ith pixel unit group to be switched to the lighting state. The sequential control here indicates that there is a set chronological order in which the respective light-emitting unit groups 22 are switched to the lit state. When displaying any frame of picture, the control circuit IC starts scanning each pixel cell group 21 from the 1 st pixel cell group until the nth pixel cell group is completely scanned, and ends the scanning process of the frame of picture. In the scanning process of the same frame, each row of pixel units in the same pixel unit group 21 is scanned one by one. The timing at which each light-emitting cell group 22 switches to the dot state matches the scanning timing of each row of pixel cells in the corresponding pixel cell group 21 and the response speed of the liquid crystal molecules in association with each other.
In the display device according to the embodiment of the present invention, before the corresponding liquid crystal molecules of the 1 st pixel unit group start responding based on the next frame, the control circuit IC sends a third control signal to sequentially control the i-th light emitting unit group corresponding to the i-th pixel unit group to be switched to the off state.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating a display principle of the display device according to the embodiment of the invention, in any two adjacent frames Frame1 and Frame2, in a Frame time sequence of a previous Frame, each light emitting unit group is sequentially turned on. Each light emitting unit group is sequentially lighted in one frame timing, and the lighting period is synchronous with the frame scanning timing. After the liquid crystal molecules corresponding to each pixel unit group 21 complete the response, the corresponding light emitting unit group 22 can be turned on in time, so that the display delay of the pixel unit group 21 is avoided, the problem of smear is avoided, the display quality is improved, and the brightness of the display picture can be improved.
In any frame picture time period, after the liquid crystal molecules corresponding to the Nth pixel unit group complete response, the corresponding Nth light-emitting unit group is switched to a lighting state, and the display of the frame picture is completed. During the scanning of the next frame, the respective light emitting cell groups 21 are sequentially turned off, and are sequentially switched to the lighting state at the completion response time described above. The sequential turning-off means that the turning-off of the light emitting unit groups 21 has a set sequential timing. The turn-off timing of the light emitting cell group 21 matches the scanning timing of each row of pixel cells in the corresponding pixel cell group 22 in association with each other.
When the display device displays the first frame of picture, all the light emitting unit groups 22 are in the off state, and in the frame of picture, before the liquid crystal molecules corresponding to any pixel unit group 21 complete the response, the corresponding light emitting unit group 22 is in the off state. When displaying each subsequent frame, for any two adjacent frames, after the previous frame is displayed, all the light emitting unit groups 22 are in an on state, in a time period of the subsequent frame, for any light emitting unit group 22, at a time point when the first pixel unit in the corresponding pixel unit group starts scanning, the light emitting unit group is turned off, after the response of the liquid crystal molecules corresponding to the pixel unit group 21 is completed, the light emitting unit group 22 is switched from the off state to an on state based on the technical solution of the present invention, and in the time period of the frame, the light emitting unit group 22 is in an off state in a process from the start of scanning by the corresponding pixel unit group 21 to the completion of the response of the liquid crystal molecules corresponding to the pixel unit group 21.
Thus, in the technical solution of the embodiment of the present invention, for any two adjacent frames, after one light emitting unit group 22 in the previous frame is switched from the off state to the on state, the on state continues until the liquid crystal molecule opposite to the light emitting unit group 22 in the next frame starts to respond, so that in the switching process of any two frames, any one light emitting unit group 22 is only in the off state in the corresponding liquid crystal molecule responding process, the problem of blurring of the dynamic display image is effectively eliminated, the problem of insufficient image display brightness caused by too long off time of the light emitting unit group 22 is avoided, and the problems of large useless power consumption and reduced service life caused by too long on time of the light emitting unit group 22 are also avoided.
The control circuit IC is configured to generate a control signal based on a scanning timing of each row of the pixel units and a response speed of the liquid crystal molecules to control the light emitting unit group to switch between an on state and an off state. When the display device displays a picture, the scanning time sequence of each row of the pixel units and the response speed of the liquid crystal molecules are known data in any frame of time period, so that based on the technical scheme of the embodiment of the invention, each light-emitting unit group can be accurately controlled to be switched between the on state and the off state.
In the display device according to the embodiment of the present invention, the display device according to the embodiment of the present invention has only one backlight module 12, and the backlight module is divided into a plurality of light emitting unit groups 22. The light emitting unit group 22 includes a plurality of light emitting units, which are LEDs, specifically, Mini-LEDs or Micro-LEDs. The Mini-LED is a sub-millimeter LED, with the individual LED size being about 100 microns. The Micro-LED is a Micro-scaled and matrixed LED, and the LED is subjected to film thinning, Micro-scaling and array design, so that the LED can be smaller than 50 micrometers.
When the light emitting unit group 22 has a plurality of light emitting units, the light emitting unit group 22 being in the off state means that all the light emitting units are off, and the light emitting unit group 22 being in the on state means that at least one light emitting unit is in the on state. The control circuit IC may control some of the light emitting units in the light emitting unit group 22 to be in a lighting state when the light emitting unit group 22 is controlled to be in the lighting state according to the display brightness requirement.
In the display device according to the embodiment of the present invention, the number of rows of the pixel units in each pixel unit group 21 may be set to be the same or different, and the number of rows of the pixel units in each pixel unit group 21 may be optionally set to be the same, so as to simplify the control logic and improve the response speed.
In a second direction (parallel to the Y-axis scoring direction), which is perpendicular to the first direction, the length of each of the light-emitting unit groups 22 is not less than the length of one row of the pixel units. In this way, the backlight emitted from each light emitting unit group 22 can be completely irradiated to the corresponding row of pixel units, and the brightness uniformity of the display image is ensured.
One light emitting unit group 22 may correspond to one or more rows of pixel units. Within the allowable range of process precision, the smaller the number of rows of the pixel units corresponding to one light emitting unit group 22 is, the better the image display quality is improved.
In the display device according to the embodiment of the present invention, the backlight module 12 can implement dynamic black insertion display, that is, each light emitting unit group 21 has a continuous off state at least in the response process of the corresponding liquid crystal molecule in one frame of display timing, and does not emit light at this time. Because the display scanning frequency is far greater than the perception of human eyes, the black insertion display human eyes cannot identify, the normal picture display quality is ensured, the power consumption can be reduced, the service life of the backlight module is prolonged, the problem of smear is avoided, and the display picture has high brightness.
Based on the foregoing embodiment, another embodiment of the present invention further provides a control method for the display device, where the control method includes: when the display device displays a picture, after the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the ith light emitting unit group corresponding to the ith pixel unit group is switched to a lighting state, and i is more than or equal to 1 and less than or equal to N.
As described above, the time required for displaying each frame is defined as TFrameDefining the time T required for the response of the corresponding liquid crystal molecules of each pixel unit group to be completed1Defining the time for each light emitting unit group to maintain the lighting state as T2Wherein, T1+T2＝TFrame。
When displaying the current frame picture, enabling the corresponding liquid crystal molecules of the 1 st pixel unit group to respond through a first control signal; the method of controlling the switching of the ith pixel cell group to the lighting state includes: when the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the control circuit acquires a first feedback signal and generates a second control signal based on the first feedback signal, and the control circuit sequentially controls the ith light emitting unit group corresponding to the ith pixel unit group to be switched into a lighting state through the second control signal.
The control method comprises the following steps: and generating a third control signal before the corresponding liquid crystal molecules of the 1 st pixel unit group start responding based on the next frame, wherein the control circuit sequentially controls the ith light-emitting unit group corresponding to the ith pixel unit group to be switched into an off state.
The control method according to the embodiment of the present invention is applied to the display device according to the embodiment, and the display principle of the control method according to the embodiment may refer to the description of the embodiment, which is not described herein again.
The control method of the embodiment of the invention can realize the backlight black insertion display process, reduce the power consumption of the backlight module and prolong the service life of the backlight module. And the problem of smear can be avoided, and the picture display quality is improved. Meanwhile, the display picture has better brightness.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. A display device, comprising: the display panel comprises a first substrate, a second substrate and a liquid crystal layer clamped between the first substrate and the second substrate, wherein the liquid crystal layer comprises a plurality of liquid crystal molecules; it is characterized in that the preparation method is characterized in that,
the display panel comprises N pixel unit groups arranged along a first direction, each pixel unit group comprises at least one row of pixel units, and N is a positive integer greater than or equal to 1;
the backlight module comprises N light emitting unit groups arranged along a first direction, and the N light emitting unit groups correspond to the N pixel unit groups one by one; when the display device displays a picture, after the response of the corresponding liquid crystal molecules of the ith pixel unit group is finished, the ith light emitting unit group corresponding to the ith pixel unit group is switched to a lighting state, wherein i is more than or equal to 1 and less than or equal to N;
the display device further includes a control circuit for controlling the light emitting unit group to be switched between a lighting state and a turn-off state, including: for any two adjacent frames, after the previous frame is displayed, all the light emitting unit groups are in an open state, and in the scanning process of the next frame, all the light emitting unit groups are closed in sequence; in the time period of the next frame, for any one of the light-emitting unit groups, at the moment when the first pixel unit in the corresponding pixel unit group starts scanning, the light-emitting unit group is closed, after the response of the liquid crystal molecules corresponding to the pixel unit group is completed, the light-emitting unit group is switched from the closed state to the lighting state, and the lighting state continues to the moment when the response of the liquid crystal molecules corresponding to the light-emitting unit group starts in the next frame; any one of the light-emitting unit groups is in an off state only during the response of the corresponding liquid crystal molecules.
2. The display device according to claim 1, wherein the time required for display of each frame is defined as TFrameDefining the time T required for the response of the corresponding liquid crystal molecules of each pixel unit group to be completed1Defining the time for each light emitting unit group to maintain the lighting state as T2Wherein, in the step (A),
T1+T2=TFrame。
3. the display device according to claim 1, further comprising a control circuit which transmits a first control signal to make the respective liquid crystal molecules of the 1 st pixel cell group respond when displaying the current frame picture;
when the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the control circuit receives a first feedback signal, and the control circuit sends a second control signal to sequentially control the ith light emitting unit group corresponding to the ith pixel unit group to be switched to a lighting state.
4. The display device according to claim 3, wherein the control circuit sends a third control signal to sequentially control the ith light emitting cell group corresponding to the ith pixel cell group to be switched to an off state before the corresponding liquid crystal molecules of the 1 st pixel cell group start responding based on a next frame picture.
5. The display device according to claim 3 or 4, wherein the control circuit is configured to generate a control signal to control the light emitting unit groups to switch between an on state and an off state based on a scanning timing of each row of the pixel units and a response speed of the liquid crystal molecules.
6. The display device according to claim 1, wherein the light emitting unit group comprises a plurality of light emitting units, and the light emitting units are Mini-LEDs or Micro-LEDs.
7. The display device according to claim 1, wherein the number of rows of pixel cells in each of the pixel cell groups is the same.
8. The display device according to claim 1, wherein a length of each of the light emitting unit groups is not less than a length of one row of the pixel units in a second direction perpendicular to the first direction.
9. A control method of a display device comprises a display panel and a backlight module, wherein the display panel comprises a first substrate, a second substrate and a liquid crystal layer clamped between the first substrate and the second substrate, the liquid crystal layer comprises a plurality of liquid crystal molecules, the display device is characterized by comprising N pixel unit groups arranged along a first direction, each pixel unit group comprises at least one row of pixel units, and N is a positive integer greater than or equal to 1; the backlight module comprises N light emitting unit groups arranged along a first direction, and the N light emitting unit groups correspond to the N pixel unit groups one by one;
the control method comprises the following steps:
when the display device displays a picture, after the response of the corresponding liquid crystal molecules of the ith pixel unit group is finished, the ith light emitting unit group corresponding to the ith pixel unit group is switched to a lighting state, wherein i is more than or equal to 1 and less than or equal to N;
for any two adjacent frames, after the previous frame is displayed, all the light emitting unit groups are in an open state, and in the scanning process of the next frame, all the light emitting unit groups are closed in sequence; in the time period of the next frame, for any one of the light-emitting unit groups, at the moment when the first pixel unit in the corresponding pixel unit group starts scanning, the light-emitting unit group is closed, after the response of the liquid crystal molecules corresponding to the pixel unit group is completed, the light-emitting unit group is switched from the closed state to the lighting state, and the lighting state continues to the moment when the response of the liquid crystal molecules corresponding to the light-emitting unit group starts in the next frame; any one of the light-emitting unit groups is in an off state only during the response of the corresponding liquid crystal molecules.
10. The control method according to claim 9, wherein the time required for display of each frame is defined as TFrameDefining the time T required for the response of the corresponding liquid crystal molecules of each pixel unit group to be completed1Defining the time for each light emitting unit group to maintain the lighting state as T2Wherein, in the step (A),
T1+T2=TFrame。
11. the control method according to claim 9, wherein, when displaying the current frame screen, the respective liquid crystal molecules of the 1 st pixel cell group are made to respond by the first control signal;
the method of controlling the switching of the ith pixel cell group to the lighting state includes:
when the response of the corresponding liquid crystal molecules of the ith pixel unit group is completed, the control circuit acquires a first feedback signal and generates a second control signal based on the first feedback signal, and the control circuit sequentially controls the ith light emitting unit group corresponding to the ith pixel unit group to be switched into a lighting state through the second control signal.
12. The control method according to claim 9, characterized by further comprising:
and generating a third control signal before the corresponding liquid crystal molecules of the 1 st pixel unit group start responding based on the next frame, wherein the control circuit sequentially controls the ith light-emitting unit group corresponding to the ith pixel unit group to be switched into an off state.
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| CN109727584A (en) * | 2018-12-14 | 2019-05-07 | 汕头超声显示器技术有限公司 | A kind of same screen aniseikania display device using direction backlight |
| CN109509437B (en) * | 2018-12-26 | 2021-08-24 | 厦门天马微电子有限公司 | Backlight module, scanning driving method of backlight module and display device |
| CN111968586B (en) * | 2020-09-07 | 2022-02-22 | 京东方科技集团股份有限公司 | Backlight source, driving method thereof, storage medium and display panel |
| CN114815348B (en) | 2021-01-28 | 2023-11-17 | 北京京东方光电科技有限公司 | Display device and driving method thereof |
| CN113035141A (en) * | 2021-03-19 | 2021-06-25 | 维沃移动通信有限公司 | Display screen, display screen driving method and device, electronic equipment and storage medium |
| CN115128803B (en) * | 2021-03-26 | 2023-04-18 | 华为技术有限公司 | Electronic device and control method thereof |
| CN113808548A (en) * | 2021-09-29 | 2021-12-17 | 武汉华星光电技术有限公司 | Display device and driving method thereof |
| CN114333728A (en) * | 2021-12-29 | 2022-04-12 | 海宁奕斯伟集成电路设计有限公司 | Liquid crystal display device and display control method thereof |
| CN115268139A (en) * | 2022-07-12 | 2022-11-01 | Tcl华星光电技术有限公司 | Display module and backlight module thereof |
| CN117198227A (en) * | 2022-08-09 | 2023-12-08 | 惠州Tcl移动通信有限公司 | Backlight control method, device, medium and equipment based on 3D display technology |
| CN117572689A (en) * | 2023-12-06 | 2024-02-20 | 北京显芯科技有限公司 | Light-emitting substrate, light-emitting control method thereof and display device |
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| CN101377901B (en) * | 2007-08-31 | 2011-10-12 | 北京京东方光电科技有限公司 | Method for driving backlight source of liquid crystal display apparatus and backlight source |
| CN102612838B (en) * | 2010-09-08 | 2014-02-12 | 青岛海信电器股份有限公司 | Three dimensional image displaying method, system, three dimensional television and glasses |
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