CN114333728A - Liquid crystal display device and display control method thereof - Google Patents
Liquid crystal display device and display control method thereof Download PDFInfo
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Abstract
The application provides a liquid crystal display device and a display control method thereof, wherein the liquid crystal display device comprises a plurality of display areas and a plurality of backlight modules, and the backlight modules corresponding to the display areas to be updated are controlled to be closed at the initial time of updating the display image of any display area to be updated aiming at a frame of display image; then updating the display picture of the display area to be updated, and controlling the backlight module corresponding to the display area to be updated to be started at a preset moment after the display picture is updated; for the next frame of display screen, the display screen that does not pass through the display area is updated in the same manner. For the display area to be updated, the backlight module corresponding to the display area is controlled to be started at the preset time after the display picture is updated, namely after the display picture is updated for a period of time, so that the time that liquid crystal molecules are irradiated by backlight and in a visible state when being turned over is reduced, and the phenomena of dynamic blurring and afterimage of the display picture are improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a liquid crystal display device and a display control method thereof.
Background
Liquid Crystal Display (LCD) devices have the advantages of high Display quality, low power consumption, and easy implementation of light and thin, and are increasingly widely used. The liquid crystal display device generally comprises a backlight module and a liquid crystal display panel, wherein the liquid crystal display panel comprises a liquid crystal layer, liquid crystal molecules in the liquid crystal layer have different deflection states under different voltages, and the liquid crystal display device can realize picture display of different gray scales by matching with the backlight module and a color film.
However, the conventional liquid crystal display device has a problem that a display screen is blurred when performing dynamic display, and the display quality is affected.
Disclosure of Invention
The present application provides a liquid crystal display device and a display control method thereof to solve the problem of the liquid crystal display device in the prior art that the display screen is blurred during dynamic display.
In a first aspect, an embodiment of the present application provides a display control method for a liquid crystal display device, where the liquid crystal display device includes a plurality of display regions and a plurality of backlight modules that correspond to one another, and the display control method includes:
for a frame of display image, controlling a backlight module corresponding to any display area to be updated to be closed at the initial time of updating the display image of the display area to be updated;
updating the display picture of the display area to be updated, and controlling a backlight module corresponding to the display area to be updated to be started at a preset time after the display picture is updated;
and determining that all the display areas are completely updated, and controlling a backlight module corresponding to any display area to be updated to be closed at the display image updating starting time of the display area to be updated in the plurality of display areas aiming at the next frame of display image.
Optionally, the preset time is within a time period for updating the display picture, or the preset time is a time when the display picture is updated, and when the preset time is the time when the display picture is updated, the backlight module corresponding to the display area to be updated is controlled to be turned on, including:
detecting whether the display picture of the display area to be updated is updated or not;
and if the display picture of the display area to be updated is updated, controlling a backlight module corresponding to the display area to be updated to be started.
Optionally, if the display frame of the display area to be updated is updated, controlling the backlight module corresponding to the display area to be updated to be turned on includes:
and if the display picture of the display area to be updated is updated, controlling a backlight module corresponding to the display area to be updated to be started after a first preset time.
Optionally, if the display frame of the display area to be updated is updated, after controlling the backlight module corresponding to the display area to be updated to be turned on after a first preset time, the method further includes:
and after the second preset time, controlling the backlight module corresponding to the display area of which the display picture is updated to be closed.
Optionally, at a starting time of updating a display image of any display area to be updated in the plurality of display areas, the controlling to turn off the backlight module corresponding to the display area to be updated includes:
sending a pulse width modulation signal to a backlight module corresponding to the display area to be updated, wherein the pulse width modulation signal comprises a first level signal, and the first level signal is used for controlling the backlight module to be closed;
after the second preset time, the controlling and closing the backlight module corresponding to the display area where the display picture is updated, including:
and sending a pulse width modulation signal to a backlight module corresponding to the display area of which the display picture is updated, wherein the pulse width modulation signal comprises a first level signal, and the first level signal is used for controlling the backlight module to be closed.
Optionally, if the display frame of the display area to be updated is updated, after a first preset time, controlling to turn on the backlight module corresponding to the display area to be updated, including:
and sending a pulse width modulation signal to a backlight module corresponding to a display area of which the display picture is updated, wherein the pulse width modulation signal comprises a second level signal, the second level signal is used for controlling the backlight module to be started, and the waveform width of the second level signal corresponds to the second preset time.
Optionally, the liquid crystal display device includes a plurality of liquid crystal molecules, each of the plurality of display regions corresponds to a plurality of liquid crystal molecules, and the detecting whether the display screen of the display region to be updated is updated includes:
judging whether the liquid crystal molecules corresponding to the display area to be updated stop overturning or not;
and if the liquid crystal molecules stop turning over, judging that the display picture of the display area is updated.
Optionally, the controlling, for a frame of display image, when the start time of the display image update of any display area to be updated in the plurality of display areas is controlled to be turned off, the backlight module corresponding to the display area to be updated further includes:
and controlling at least part of the backlight module corresponding to the rest of the display area outside the display area to be updated to be started.
In a second aspect, an embodiment of the present application provides a liquid crystal display device, where the liquid crystal display device adopts the display control method provided in the embodiment of the present application, and the liquid crystal display device includes:
a liquid crystal display panel for displaying an image, including a plurality of display regions;
the backlight module is used for providing backlight for the liquid crystal display panel and comprises a plurality of backlight modules;
the display driving circuit is used for sending scanning signals to the liquid crystal display panel so as to update the display pictures of the display areas and detecting whether the display pictures of the display areas are updated or not;
the backlight driving circuit is used for controlling the opening and closing of the plurality of backlight modules.
Optionally, the backlight driving circuit is specifically configured to:
sending a pulse width modulation signal to the backlight module, wherein the pulse width modulation signal comprises a first level signal, and the first level signal is used for controlling the backlight module to be closed;
and sending a pulse width modulation signal to the backlight module, wherein the pulse width modulation signal comprises a second level signal, and the second level signal is used for controlling the backlight module to be started.
The beneficial technical effects brought by the technical scheme provided by the embodiment of the application comprise:
the liquid crystal display device in the embodiment of the application comprises a plurality of display areas and a plurality of backlight modules, and when the display screen of the effective display area of the liquid crystal display panel is updated, different display areas are updated in different time periods and in different batches within one frame time. The method comprises the steps of firstly determining a display area to be updated in a plurality of display areas as a display area to be updated, controlling a backlight module corresponding to the display area to be closed at the initial time of updating a display picture, then updating the display picture of the display area, and controlling a backlight module corresponding to the display area to be opened at a preset time after the display picture is updated, namely after waiting for a period of time after the display picture is updated. And according to the steps, gradually updating other display areas until all the display areas are updated. After all the display areas are determined to be updated, the plurality of display areas are sequentially updated according to the same mode for the next frame of display picture, namely in the next frame time. And for the display area to be updated, controlling the backlight module corresponding to the display area to be in a closed state at the initial moment of updating the display picture. And then updating the display picture of the display area to be updated, and controlling the backlight module corresponding to the display picture to be started at a preset time after the display picture is updated, namely, after the display picture is updated for a period of time, starting the backlight module, so that the backlight module can be started after the liquid crystal molecules are turned over for a period of time or have been turned over to a specified position, thereby reducing the overlapping time of the backlight module in a starting state and the liquid crystal molecules in a turning state and improving the phenomena of dynamic blurring and afterimage of the display picture.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic flowchart of a display control method of a liquid crystal display device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present disclosure;
fig. 3 is a schematic cross-sectional structure view of a liquid crystal display panel and a backlight module in a liquid crystal display device according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating a process of turning liquid crystal molecules line by line in an embodiment of the present application;
FIG. 5 is a schematic view of an LCD panel according to an embodiment of the present application;
fig. 6 is a flowchart illustrating a specific display control method according to an embodiment of the present disclosure;
FIG. 7 is a waveform diagram of a response curve of a liquid crystal;
fig. 8 is a schematic flowchart of another specific display control method according to an embodiment of the present application;
fig. 9 is a timing diagram of a frame scanning signal, a backlight module driving signal, and a display area update according to an embodiment of the present application.
In the figure:
10-a liquid crystal display device; 11-display driving circuit; 12-a liquid crystal display panel; 13 a backlight module; 14-backlight driving circuit;
120-active display area; 1201-display area; 130-backlight module.
Detailed Description
Reference will now be made in detail to the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar parts or parts having the same or similar functions throughout. In addition, if a detailed description of the known art is not necessary for illustrating the features of the present application, it is omitted. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
It will be understood by those within the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
The present inventors have considered that, in a conventional liquid crystal display device, when a display screen is updated, it is necessary to input different driving voltages to each pixel unit in the display device to update each pixel, and to change the deflection state of liquid crystal molecules corresponding to the pixel unit, that is, to invert the liquid crystal molecules corresponding to the pixel unit, thereby completing the update of the display screen.
The control of the on and off of the backlight module in the existing display device is usually performed independently and independent of the turning of the liquid crystal molecules. When the backlight module is in a normally bright state, the liquid crystal molecules are still irradiated with backlight when being turned over, so that the turning over of the liquid crystal molecules can be perceived by human eyes and macroscopically shows that dynamic blurring and afterimages appear on a display picture.
The present application provides a liquid crystal display device and a display control method thereof, which aim to solve the above technical problems in the prior art.
The following describes a liquid crystal display device and a display control method thereof according to embodiments of the present application in detail with reference to the accompanying drawings.
An embodiment of the present application provides a display control method of a liquid crystal display device 10, as shown in fig. 1, including:
s101, aiming at a frame of display picture, controlling a backlight module corresponding to a display area to be updated to be closed at the starting time of the display picture updating of any display area to be updated in a plurality of display areas;
s102, updating a display picture of a display area to be updated, and controlling a backlight module corresponding to the display area to be updated to be started at a preset time after the display picture is updated;
and S103, determining that all the display areas are completely updated, and controlling the backlight module corresponding to the display area to be updated to be closed at the display image updating starting time of any display area to be updated in the plurality of display areas aiming at the next frame of display image.
Specifically, as shown in fig. 2, 3 and 4, the liquid crystal display device 10 includes a liquid crystal display panel 12, a backlight module 13, a display driving circuit 11, and a backlight driving circuit 14. The effective display area 120 of the liquid crystal display panel 12 is divided into a plurality of display areas 1201, and each display area 1201 includes a plurality of rows of pixel units (not shown in the figure). The backlight module 13 includes a plurality of backlight modules 130, and the backlight modules 130 correspond to the plurality of display areas 1201 one by one to provide backlight sources for different display areas. When updating the display screen of a single display area 1201, the display driving circuit 11 sends a driving voltage signal to refresh the pixel units in the display area 1201 line by line to change the content of the display screen, and drives the liquid crystal molecules corresponding to each line of pixels to turn over line by line to complete the updating of the display screen. The sizes and the numbers of the display regions 1201 and the backlight modules 130 can be adjusted according to actual situations, and when the size of the liquid crystal display panel 12 is fixed, the larger the area of the display regions 1201 is, the more pixel units are included in the display regions 1201, the smaller the number of the display regions 1201 is, and the larger the size of the corresponding backlight module 130 is, the smaller the number of the backlight modules 130 is.
When updating the display screen of the effective display area 120 of the liquid crystal display panel 12, that is, updating the display screens of all the display areas 1201, updating the different display areas 1201 in a time of one frame in divided periods and in divided batches is performed. Firstly, a display area 1201 to be updated in a plurality of display areas 1201 is determined as a display area 1201 to be updated, the backlight module 130 corresponding to the display area 1201 is controlled to be closed at the initial time of updating the display picture, then the display picture of the display area 1201 is updated, and the backlight module 130 corresponding to the display area is controlled to be opened at the preset time after the display picture is updated, namely after waiting for a period of time after the display picture is updated. According to the above steps, the other display areas 1201 are gradually updated until all the display areas 1201 are updated. After it is determined that all the display areas 1201 are updated, the plurality of display areas 1201 are sequentially updated in the same manner for the next frame of display picture, that is, in the next frame time, that is, at the start time of updating the display picture of the display area 1201 to be updated, the backlight module 130 corresponding to the display area 1201 to be updated is controlled to be turned off, then the display picture of the display area 1201 is started to be updated, and the backlight module 130 corresponding to the display area 1201 is controlled to be turned on at the preset time after the display picture is started to be updated.
For the display area to be updated 1201, at the start time of the display screen update, the backlight module 130 corresponding to the display area to be updated is controlled to be in the off state. Then, the display picture of the display area 1201 to be updated is updated, and the backlight module 130 corresponding to the updated display picture is controlled to be turned on at a preset time after the display picture is updated, that is, after the display picture is updated for a period of time, so that the backlight module 130 is turned on after the liquid crystal molecules are turned over for a period of time or have been turned over to a specified position, thereby reducing the overlapping time of the backlight module 130 in the on state and the liquid crystal molecules in the turning state, that is, reducing the time of the liquid crystal molecules being illuminated by the backlight in the visible state during turning, and improving the phenomena of dynamic blur and afterimage of the display picture.
It should be noted that, when updating the entire display screen of the liquid crystal display device 10, the plurality of display areas 1201 may be updated one by one, or a part of the display areas 1201 may be updated first, and then another part of the display areas 1201 is updated, that is, the display area to be updated may include only one display area 1201, or may include a plurality of display areas 1201.
Specifically, as shown in fig. 5, the liquid crystal display panel 12 in the liquid crystal display device 10 includes six display areas distributed along the first direction, and when the display screen is updated, the display screen may be updated one by one according to the sequence from the first display area 1201a to the sixth display area 1201f, and when the display screen of the first display area 1201a is updated (at this time, the first display area 1201a is the display area to be updated), the backlight module 130 corresponding to the first display area 1201a is controlled to be turned off at the starting time of updating the first display area 1201a, and when the display screen of the second display area 1201b is updated (at this time, the second display area 1201b is the display area to be updated), the backlight module 130 corresponding to the second display area 1201b is controlled to be turned off at the starting time of updating the second display area 1201b, and so on until the update of the entire display screen is completed. The first display area 1201a and the second display area 1201b may be updated first, then the third display area 1201c and the fourth display area 1201d may be updated, and finally the fifth display area 1201e and the sixth display area 1201f may be updated, when the first display area 1201a and the second display area 1201b are updated, the backlight modules 130 corresponding to the first display area 1201a and the second display area 1201b are controlled to be turned off at the start time of the update, and so on, and the third display area 1201c to the sixth display area 1201f are continuously updated until all the display areas are updated. The specific manner of updating the plurality of display areas can be adjusted according to actual conditions.
Optionally, in an embodiment of the present application, when the preset time is a time after the update of the display screen is completed, the controlling the backlight module 130 corresponding to the to-be-updated display area 1201 to be turned on includes, as shown in fig. 6:
s201, detecting whether the display picture of the display area to be updated is updated;
s202, if the display picture of the display area to be updated is updated, controlling the backlight module corresponding to the display area to be updated to be started.
Specifically, the preset time for controlling the backlight module 130 may be within a time period for updating the display screen, that is, when the update of the display screen of the display area 1201 is not completed, the backlight module 130 corresponding to the display area 1201 is controlled to be turned on. Or, the preset time may be a time after the update of the display screen is completed, that is, after the update of the display screen of the display area 1201 is completed, the backlight module 130 corresponding to the display area 1201 is controlled to be turned on. Optionally, the preset time is set as the time after the display frame is completed, after the display frame of the display area 1201 is completely updated, whether the display frame of the display area 1201 to be updated is completely updated is detected, and if the display frame of the display area 1201 to be updated is completely updated, the backlight module 130 corresponding to the display area 1201 is controlled to be turned on. Therefore, the backlight module 130 can be ensured to be in a closed state when the liquid crystal molecules corresponding to the display area 1201 are turned over, so that the turning over of the liquid crystal molecules is invisible, and the phenomena of dynamic blurring and afterimage of a display picture are avoided.
It should be noted that detecting whether the display screen of the display area to be updated 1201 is updated or not may be implemented in various ways. Optionally, in an embodiment of the present application, detecting whether the display screen of the display area to be updated 1201 is updated includes:
judging whether the liquid crystal molecules corresponding to the display area to be updated stop overturning or not;
and if the liquid crystal molecules stop turning over, judging that the display picture of the display area is updated.
Specifically, the liquid crystal response curve can be used to determine the inversion state of the liquid crystal molecules. Firstly, measuring liquid crystal response curves of different display areas 1201 in the liquid crystal display panel 12, controlling the display areas 1201 to alternately display a pure white image and a pure black image, placing a photoelectric conversion detector on the display areas 1201 in the process of alternately displaying the black and white images, then connecting the photoelectric conversion detector with an oscilloscope, and obtaining the liquid crystal response curves by using the oscilloscope. As shown in fig. 7, the time from the time corresponding to the lowest point to the time corresponding to the highest point in the liquid crystal response curve is the time from the start of the inversion to the stop of the inversion of the liquid crystal molecules (the liquid crystal molecules reach the steady state). When the display image of the display area 1201 is updated, the display driving circuit 11 sends a driving voltage signal to the liquid crystal display panel 12 to control the liquid crystal molecules to turn over, and starts timing at the same time, and when the time reaches the time from the time corresponding to the lowest point to the time corresponding to the highest point in the liquid crystal response curve, it is determined that the liquid crystal molecules corresponding to the display area 1201 stop turning over, and then it is determined that the display image of the display area 1201 is updated. Whether the display image of the display area 1201 is updated or not is judged by judging whether the liquid crystal molecules corresponding to the display area 1201 to be updated stop overturning or not, so that the backlight module 130 corresponding to the display area 1201 is controlled to be started after the liquid crystal molecules stop overturning (the liquid crystal molecules reach a stable state), and the phenomena of blurring and afterimage of the display image are further avoided.
Optionally, in an embodiment of the present application, when the preset time is a time after the update of the display screen is completed, the method for controlling the backlight module 130 corresponding to the to-be-updated display area 1201 to be turned on includes, as shown in fig. 8:
detecting whether the display picture of the display area to be updated is updated or not;
and if the display picture of the display area to be updated is updated, controlling the backlight module corresponding to the display area to be updated to be started after the first preset time.
Specifically, the preset time is set as the time after the display screen is completed, after the display screen of the display area 1201 is completely updated, whether the display screen of the display area 1201 to be updated is completely updated is detected, and if the display screen of the display area 1201 to be updated is completely updated, the backlight module 130 corresponding to the display area 1201 is controlled to be turned on after the first preset time, that is, after the display screen of the display area 1201 to be updated is completely updated, the backlight module 130 corresponding to the display area 1201 is controlled to be turned on after a certain time, so that the phenomena of blurring and afterimage of the display screen are further avoided. The length of the first preset time can be adjusted according to actual conditions, and is not limited herein.
Optionally, as shown in fig. 8, in an embodiment of the present application, if the display screen of the display area to be updated 1201 is updated, after controlling the backlight module 130 corresponding to the display area to be updated 1201 to be turned on after the first preset time, the method further includes:
and after the second preset time, controlling the backlight module corresponding to the display area of which the display picture is updated to be closed.
Specifically, for the display area 1201 to be updated, at a preset time after the display screen is updated, the backlight module 130 corresponding to the display area 1201 is controlled to be turned on, and the time when the backlight module 130 of the display area 1201 is in the on state may be adjusted according to an actual situation. Optionally, after a second preset time after the backlight module 130 in the display area 1201 is turned on, the backlight module 130 is controlled to be turned off, that is, the backlight module 130 is turned off after the backlight module 130 is turned on for a period of time. Therefore, the backlight module 130 can be prevented from being always in a normally bright state within one frame time, and power consumption can be reduced.
It should be noted that the specific manner of controlling the backlight module 130 to turn on and off may be adjusted according to actual situations. Optionally, in an embodiment of the present application, controlling, at a start time of updating a display screen of any display area 1201 to be updated in the display area 1201, a backlight module 130 corresponding to the display area 1201 to be updated is turned off, including:
and sending a pulse width modulation signal to a backlight module corresponding to the display area to be updated, wherein the pulse width modulation signal comprises a first level signal, and the first level signal is used for controlling the backlight module to be closed.
After the second preset time, controlling the backlight module corresponding to the display area where the display picture is updated to be closed, including:
and sending a pulse width modulation signal to a backlight module corresponding to the display area of which the display picture is updated, wherein the pulse width modulation signal comprises a first level signal, and the first level signal is used for controlling the backlight module to be closed.
If the display picture of the display area to be updated is updated, controlling the backlight module corresponding to the display area to be updated to be started after the first preset time, wherein the method comprises the following steps:
and sending a pulse width modulation signal to the backlight module corresponding to the display area of which the display picture is updated, wherein the pulse width modulation signal comprises a second level signal, the second level signal is used for controlling the backlight module to be started, and the waveform width of the second level signal corresponds to second preset time.
Specifically, as shown in fig. 2, fig. 3, fig. 4 and fig. 9, the liquid crystal display panel 12 includes n display areas 1201, when a display screen of a first display area (a frame marked with a numeral 1 in fig. 9 represents the first display area) is to be updated, the backlight driving circuit 14 sends a first level signal to the backlight module 130 corresponding to the first display area, controls the backlight module corresponding to the first display area to be turned off (the first backlight module in fig. 9), and then starts to update the display screen of the first display area, and at a preset time when the display screen is started to be updated, the backlight driving circuit 14 sends a second level signal to the backlight module corresponding to the first display area to control the backlight module 130 to be turned on. After a second preset time t2, that is, after the backlight module 130 corresponding to the display area 1201 in which the display frame is updated continues to be turned on for a time t2, the backlight driving circuit 14 sends a first level signal to the backlight module again to control the backlight module to be turned off. The first level signal and the second level signal form a pulse width modulation signal, and the wavelength of the second level signal corresponds to a second preset time t2, that is, the duration of the backlight module in the on state is consistent with the second preset time t 2. The control of the opening and closing of the backlight module is realized by sending the pulse width modulation signal to the backlight module, the control is easier, and in addition, the anti-interference and anti-noise capabilities of the pulse width modulation signal are stronger, which is beneficial to improving the stability of the liquid crystal display device 10.
Optionally, in an embodiment of the present application, for a frame of a display screen, controlling, at a starting time of updating a display screen of any display area 1201 to be updated in a plurality of display areas 1201, to close the backlight module 130 corresponding to the display area 1201 to be updated, further includes:
and controlling at least part of the backlight module 130 corresponding to the rest of the display area 1201 outside the display area 1201 to be updated to be started.
Specifically, referring to fig. 5, the liquid crystal display panel 12 in the liquid crystal display device 10 includes six display regions 1201 distributed along the first direction, and the display screens may be updated one by one according to the sequence from the first display region 1201a to the sixth display region 1201 f. When the display screen of the first display area 1201a is updated (at this time, the first display area 1201a is the display area 1201 to be updated), the backlight module 130 corresponding to the first display area 1201a is controlled to be turned off, and at least a part of the backlight modules 130 outside the first display area 1201a is controlled to be turned on (the backlight modules corresponding to any display areas in the second to sixth display areas are specifically adjusted according to actual conditions), so that when the display screen of the liquid crystal display panel 12 is updated, a part of the backlight modules 130 are still in an on state, so that the liquid crystal display panel 12 always has a certain brightness when the display screen is updated, and the phenomenon of uneven brightness (macroscopically expressed as flickering of the display screen) caused by turning off all the backlight modules 130 when the display screen is updated and turning on all the backlight modules 130 after the update is completed is improved, is favorable for improving the display quality.
Based on the same inventive concept, the embodiment of the present application further provides a liquid crystal display device 10, where the liquid crystal display device 10 adopts the display control method in the embodiment of the present application, and as shown in fig. 2 and fig. 3, the liquid crystal display device 10 includes:
a liquid crystal display panel 12 for displaying an image, including a plurality of display regions 1201;
the backlight module 13 is used for providing backlight for the liquid crystal display panel 12, and includes a plurality of backlight modules 130;
a display driving circuit 11 for sending a scanning signal to the liquid crystal display panel 12 to update the display screens of the plurality of display areas 1201 and for detecting whether the display screens of the display areas are completed;
the backlight driving circuit 14 is used for controlling the plurality of backlight modules 130 to be turned on and off.
Specifically, the liquid crystal display device 10 includes a liquid crystal display panel 12, a backlight module 13 and a display driving circuit 11, an effective display area 120 of the liquid crystal display panel 12 is divided into a plurality of display areas 1201, and each display area 1201 includes a plurality of rows of pixel units (not shown in the figure). The backlight module 13 includes a plurality of backlight modules 130, and the backlight modules 130 correspond to the plurality of display areas 1201 one by one to provide backlight sources for different display areas. The display driving circuit 11 is electrically connected to the liquid crystal display panel 12, the backlight driving circuit 14 is electrically connected to the backlight module 13, and when the display screen of a single display area 1201 is updated, the display driving circuit 11 sends a driving voltage signal to refresh the pixel units in the display area 1201 line by line, and drives the liquid crystal molecules corresponding to the pixels in each line to turn over line by line to change the content of the display screen, thereby updating the display screen in the display area 1201. The backlight module 130 corresponding to the display area 1201 is controlled to be closed at the initial time of updating the display picture, then the display picture of the display area 1201 is updated, and the backlight module 130 corresponding to the display picture is controlled to be opened at the preset time after the display picture is updated, namely after the display picture is updated for a period of time, so that the overlapping time of the backlight module 130 in the opening state and the liquid crystal molecules in the overturning state is reduced, namely the time that the liquid crystal molecules are irradiated by the backlight to be in the visible state during overturning is reduced, and the phenomena of dynamic blurring and afterimage of the display picture are improved.
Optionally, in an embodiment of the present application, the backlight driving circuit 14 is specifically configured to:
sending a pulse width modulation signal to the backlight module 130, where the pulse width modulation signal includes a first level signal, and the first level signal is used to control the backlight module 130 to be turned off;
and sending a pulse width modulation signal to the backlight module 130, where the pulse width modulation signal includes a second level signal, and the second level signal is used to control the backlight module 130 to be turned on.
The specific process of the backlight driving circuit 14 sending the pulse width modulation signal to the backlight module 130 may refer to the description in the foregoing, and is not described herein again.
A display control method of the liquid crystal display device 10 according to an embodiment of the present application will be described in detail with reference to the drawings.
As shown in fig. 2, 3, 4, and 9, the liquid crystal display panel 12 includes n display regions 1201(n is a positive integer greater than or equal to 2, which may be adjusted according to actual conditions), and the n display regions 1201 are arranged along the first direction. The corresponding backlight module 13 includes n backlight modules 130, and each display area 1201 of the n display areas 1201 corresponds to one backlight module 130. In one frame time, the display driving circuit 11 sends a frame scanning signal to the display panel to refresh the pixel units line by line. The frame scanning signal includes a high level signal and a low level signal, and when the frame scanning signal is at a low level, the display driving circuit 11 sends a driving voltage signal to the display panel 12 to control the liquid crystal molecules corresponding to the different display regions 1201 to sequentially turn over. The display driving circuit 11 sends the pwm signal to the plurality of backlight modules 130, at the starting time of starting to flip the liquid crystal molecules corresponding to the first display region (indicated by the block labeled with numeral 1 in fig. 9), the pwm signal of the first backlight module is the first level signal (low level signal in fig. 9), the display driving circuit 11 controls the backlight module corresponding to the first display region (i.e. the first backlight module in fig. 9) to turn off, after the liquid crystal molecules are turned over to reach a stable state and after a first preset time t1, the pulse width modulation signal is changed to a second level signal, the display driving circuit 11 controls the backlight module corresponding to the first display region to be turned on, after the second preset time t2, the pwm signal is changed to the first level signal again, the display driving circuit 11 controls the backlight module corresponding to the first display region to be turned off, and the first preset time t1 and the second preset time t2 may be adjusted according to actual conditions.
With continued reference to fig. 2, 3, 4 and 9, after the liquid crystal molecules corresponding to the first display region are turned over, the liquid crystal molecules corresponding to the second display region (indicated by the square with reference numeral 2 in fig. 9) are controlled to start turning over, at the initial time when the liquid crystal molecules corresponding to the second display region start to turn over, the pulse width modulation signal is the first level signal, the display driving circuit 11 controls the backlight module corresponding to the second display region (i.e. the second backlight module 130 in fig. 9) to turn off, after the liquid crystal molecules are turned over to reach the stable state and wait for a period of time (i.e. a first preset time t1), the pulse width modulation signal is changed to a second level signal, the display driving circuit 11 controls the backlight module corresponding to the second display region to be turned on, after the second preset time t2, the wide modulation signal is changed to the first level signal again, and the display driving circuit 11 controls the backlight module corresponding to the second display region to be turned off. And by analogy, gradually updating the third display area (represented by the square with the reference numeral 3 in the figure 9) to the nth display area (represented by the square with the reference numeral n in the figure 9) until the display pictures of all the display areas are updated. In the next frame time, the display driving circuit 11 first sends a high-level frame scanning signal to the display panel to refresh the pixel units line by line, then the frame scanning signal is changed into a low-level signal, when the frame scanning signal is at a low level, the display driving circuit 11 controls the liquid crystal molecules corresponding to different display areas to turn over in sequence so as to update the display pictures of the different display areas in sequence, and the backlight driving circuit 14 controls the backlight module 130 corresponding to the updated display area to be turned off and on at a proper time.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
1. in the embodiment of the present application, for the display area 1201 to be updated, at the start time of the display screen update, the backlight module 130 corresponding to the display area is controlled to be in the off state. Then, the display picture of the display area 1201 to be updated is updated, and the backlight module 130 corresponding to the updated display picture is controlled to be turned on at a preset time after the display picture is updated, that is, after the display picture is updated for a period of time, so that the backlight module 130 is turned on after the liquid crystal molecules are turned over for a period of time or have been turned over to a specified position, thereby reducing the overlapping time of the backlight module 130 in the on state and the liquid crystal molecules in the turning state, that is, reducing the time of the liquid crystal molecules being illuminated by the backlight in the visible state during turning, and improving the phenomena of dynamic blur and afterimage of the display picture.
2. By setting the preset time as the time after the display is completed, after the display of the display area 1201 is completed, it is detected whether the display of the display area 1201 to be updated is completed, and if the display of the display area 1201 to be updated is completed, the backlight module 130 corresponding to the display area 1201 is controlled to be turned on. Therefore, the backlight module 130 can be ensured to be in a closed state when the liquid crystal molecules corresponding to the display area 1201 are turned over, so that the turning over of the liquid crystal molecules is invisible, and the phenomena of dynamic blurring and afterimage of a display picture are avoided.
3. Whether the display image of the display area 1201 is updated or not is judged by judging whether the liquid crystal molecules corresponding to the display area 1201 to be updated stop overturning or not, so that the backlight module 130 corresponding to the display area 1201 is controlled to be started after the liquid crystal molecules stop overturning (the liquid crystal molecules reach a stable state), and the phenomena of blurring and afterimage of the display image are further avoided.
4. In the embodiment of the application, the backlight module 130 corresponding to the display area 1201 is controlled to be turned on after the display screen of the display area 1201 to be updated has been updated for the first preset time, that is, after the display screen of the display area 1201 to be updated has been updated, the backlight module 130 corresponding to the display area 1201 is controlled to be turned on after waiting for a period of time, so that the backlight module 130 corresponding to the display area 1201 is turned on after the liquid crystal molecules stop turning (the liquid crystal molecules reach the stable state) for a period of time, and the phenomena of blurring and afterimage of the display screen are further avoided.
5. In the embodiment of the present application, the pulse width modulation signal is sent to the backlight module 130 to control the opening and closing of the backlight module 130, which is easier in control, and in addition, the pulse width modulation signal has stronger anti-interference and anti-noise capabilities, which is beneficial to improving the stability of the liquid crystal display device 10.
6. By controlling the backlight module 130 corresponding to the display area 1201 to be updated to be closed and at least part of the backlight module 130 corresponding to the rest of the display area 1201 outside the display area 1201 to be updated to be opened at the same time, when part of the display area 1201 of the liquid crystal display panel 12 is performing the display image update, part of the backlight module 130 is still in an open state, so that the liquid crystal display panel 12 always has a certain brightness when performing the display image update, thereby improving the uneven brightness phenomenon (macroscopically, the display image flickers) caused by the fact that all the backlight modules 130 are closed when the display image is updated and all the backlight modules 130 are opened after the update is completed, and being beneficial to improving the display quality.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, unless otherwise specified, "a plurality of 0" means two or more.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present application, and these modifications and decorations should also be regarded as the protection scope of the present application.
Claims (10)
1. A display control method of a liquid crystal display device, the liquid crystal display device comprises a plurality of display areas and a plurality of backlight modules which are in one-to-one correspondence, and the method is characterized by comprising the following steps:
for a frame of display image, controlling a backlight module corresponding to any display area to be updated to be closed at the initial time of updating the display image of the display area to be updated;
updating the display picture of the display area to be updated, and controlling a backlight module corresponding to the display area to be updated to be started at a preset time after the display picture is updated;
and determining that all the display areas are completely updated, and controlling a backlight module corresponding to any display area to be updated to be closed at the display image updating starting time of the display area to be updated in the plurality of display areas aiming at the next frame of display image.
2. The display control method according to claim 1, wherein the preset time is within a time period for updating the display screen, or the preset time is a time after the display screen is updated, and when the preset time is the time after the display screen is updated, the backlight module corresponding to the display area to be updated is controlled to be turned on, and the method comprises:
detecting whether the display picture of the display area to be updated is updated or not;
and if the display picture of the display area to be updated is updated, controlling a backlight module corresponding to the display area to be updated to be started.
3. The method according to claim 2, wherein if the display frame of the display area to be updated is updated, controlling the backlight module corresponding to the display area to be updated to be turned on comprises:
and if the display picture of the display area to be updated is updated, controlling a backlight module corresponding to the display area to be updated to be started after a first preset time.
4. The method according to claim 3, wherein after controlling the backlight module corresponding to the display area to be updated to be turned on after a first preset time if the display frame of the display area to be updated is updated, further comprising:
and after the second preset time, controlling the backlight module corresponding to the display area of which the display picture is updated to be closed.
5. The method according to claim 4, wherein the controlling of the backlight module corresponding to the display area to be updated to be turned off at a starting time of the display image update of any display area to be updated in the plurality of display areas comprises:
sending a pulse width modulation signal to a backlight module corresponding to the display area to be updated, wherein the pulse width modulation signal comprises a first level signal, and the first level signal is used for controlling the backlight module to be closed;
after the second preset time, the controlling and closing the backlight module corresponding to the display area where the display picture is updated, including:
and sending a pulse width modulation signal to a backlight module corresponding to the display area of which the display picture is updated, wherein the pulse width modulation signal comprises a first level signal, and the first level signal is used for controlling the backlight module to be closed.
6. The method according to claim 4, wherein if the display frame of the display area to be updated is updated, controlling the backlight module corresponding to the display area to be updated to be turned on after a first preset time, comprises:
and sending a pulse width modulation signal to a backlight module corresponding to a display area of which the display picture is updated, wherein the pulse width modulation signal comprises a second level signal, the second level signal is used for controlling the backlight module to be started, and the waveform width of the second level signal corresponds to the second preset time.
7. The method according to any one of claims 2 to 6, wherein the liquid crystal display device includes a plurality of liquid crystal molecules, each of the plurality of display regions corresponds to a plurality of liquid crystal molecules, and the detecting whether the display screen of the display region to be updated is updated includes:
judging whether the liquid crystal molecules corresponding to the display area to be updated stop overturning or not;
and if the liquid crystal molecules stop turning over, judging that the display picture of the display area is updated.
8. The method according to any one of claims 1 to 6, wherein the controlling, for a frame of display, that the backlight module corresponding to the display area to be updated is turned off at a start time of updating the display screen of any display area to be updated in the plurality of display areas further comprises:
and controlling at least part of the backlight module corresponding to the rest of the display area outside the display area to be updated to be started.
9. A liquid crystal display device adopting the display control method according to any one of claims 1 to 8, comprising:
a liquid crystal display panel for displaying an image, including a plurality of display regions;
the backlight module is used for providing backlight for the liquid crystal display panel and comprises a plurality of backlight modules;
the display driving circuit is used for sending scanning signals to the liquid crystal display panel so as to update the display pictures of the display areas and detecting whether the display pictures of the display areas are updated or not;
the backlight driving circuit is used for controlling the opening and closing of the plurality of backlight modules.
10. The lcd device of claim 9, wherein the backlight driver circuit is specifically configured to:
sending a pulse width modulation signal to the backlight module, wherein the pulse width modulation signal comprises a first level signal, and the first level signal is used for controlling the backlight module to be closed;
and sending a pulse width modulation signal to the backlight module, wherein the pulse width modulation signal comprises a second level signal, and the second level signal is used for controlling the backlight module to be started.
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Address after: Room 263, block B, science and technology innovation center, 128 Shuanglian Road, Haining Economic Development Zone, Haining City, Jiaxing City, Zhejiang Province, 314400 Applicant after: Haining yisiwei IC Design Co.,Ltd. Applicant after: Beijing ESWIN Computing Technology Co.,Ltd. Address before: Room 263, block B, science and technology innovation center, 128 Shuanglian Road, Haining Economic Development Zone, Haining City, Jiaxing City, Zhejiang Province, 314400 Applicant before: Haining yisiwei IC Design Co.,Ltd. Applicant before: Beijing yisiwei Computing Technology Co.,Ltd. |
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Application publication date: 20220412 |