CN114399976A - Liquid crystal display device and backlight driving method thereof - Google Patents
Liquid crystal display device and backlight driving method thereof Download PDFInfo
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- CN114399976A CN114399976A CN202210138274.1A CN202210138274A CN114399976A CN 114399976 A CN114399976 A CN 114399976A CN 202210138274 A CN202210138274 A CN 202210138274A CN 114399976 A CN114399976 A CN 114399976A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 253
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000758 substrate Substances 0.000 claims abstract description 35
- 239000003086 colorant Substances 0.000 claims abstract description 21
- 238000010586 diagram Methods 0.000 description 8
- 239000010408 film Substances 0.000 description 6
- 239000011159 matrix material Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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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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- 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
- G09G3/36—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 using liquid crystals
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
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Abstract
The application discloses a liquid crystal display device and a backlight driving method thereof. The liquid crystal display device comprises a liquid crystal display panel and a backlight module. The liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer arranged between the color film of the array substrate and the substrate. Each frame of picture display period of the liquid crystal display panel comprises at least two subframes, and each subframe comprises a display phase and a dark state phase. In the display phase, the liquid crystals in the liquid crystal layer are arranged to be deflected line by line. The backlight module is used for respectively providing light sources with different colors to the liquid crystal display panel in a plurality of sub-frames, and the backlight module is in a luminous state at least in a display stage. In the application, the liquid crystal display panel is in the display mode after the deflection of each line of liquid crystal is finished, the display time is greatly increased, and the display brightness is effectively improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a liquid crystal display device and a backlight driving method thereof.
Background
A Liquid Crystal Display (LCD) panel controls a screen to Display different images by controlling a deflection angle of Liquid Crystal by voltage. Since the lcd panel itself does not have self-light emitting property, the backlight module must be disposed under the lcd panel to provide the backlight source required by the lcd panel.
The Field Sequential Full-Color (Field Sequential Full Color) liquid crystal display device uses a Color Sequential Method to switch the light sources of three primary colors in the backlight module in time sequence, and controls the transmittance of the liquid crystal pixel in the display time of each Color light source to adjust the relative light quantity of each primary Color to form a specific Color picture. The field sequential display adopts temporal color mixing, does not need a color filter, and each pixel does not need to be divided into three primary color sub-pixels, thereby avoiding the brightness loss caused by the absorption of light by the color filter and the small aperture opening ratio of the pixel and leading the penetration rate to be far higher than that of the common thin film transistor liquid crystal display.
In general, to avoid color mixing and display unevenness of the liquid crystal display panel, the field sequential display backlight is turned on only after each line of liquid crystal reaches a set deflection state in sequence, which results in too short display time and reduced display brightness.
Disclosure of Invention
The embodiment of the application provides a liquid crystal display device and a backlight driving method thereof, which solve the problems of too short display time and reduced display brightness of a liquid crystal display panel in the prior field sequential display technology.
The embodiment of the application provides a liquid crystal display device, it includes:
the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer arranged between the array substrate and the color film substrate, wherein each frame of picture display period of the liquid crystal display panel comprises at least two subframes, each subframe comprises a display stage and a dark state stage, and liquid crystal in the liquid crystal layer is configured to deflect line by line in the display stage;
the backlight module is arranged on one side of the array substrate, which is far away from the liquid crystal layer, and is used for respectively providing light sources with different colors to the liquid crystal display panel in the plurality of sub-frames and at least being in a light-emitting state in the display stage.
Optionally, in some embodiments of the present application, in each of the subframes, the liquid crystal in the liquid crystal layer is configured to be deflected twice line by line;
the display stage corresponds to a time period from the first row of liquid crystals of the current sub-frame starting to deflect for the first time to the last row of liquid crystals starting to deflect for the second time, and the dark state stage corresponds to a time period from the last row of liquid crystals of the current sub-frame starting to deflect for the second time to the first row of liquid crystals of the next sub-frame starting to deflect for the first time.
Optionally, in some embodiments of the present application, the backlight module is in a light-emitting state in both the display stage and the dark state stage;
and when the liquid crystal in the liquid crystal layer deflects line by line for the second time, the voltage difference value of the two ends of the liquid crystal in each line is zero.
Optionally, in some embodiments of the present application, in the dark state stage, the backlight module is in an off state.
Optionally, in some embodiments of the present application, when the liquid crystal in the liquid crystal layer is deflected line by line for the second time, the voltage difference between the two ends of the liquid crystal in each line is zero.
Optionally, in some embodiments of the present application, in each of the subframes, the lighting duration ratio of the display phase is at least 1/2.
Optionally, in some embodiments of the present disclosure, each frame of the image display period includes two subframes, the backlight module includes a white light source and a first light source, the first light source is any one of a red light source, a green light source and a blue light source, and the liquid crystal display panel includes two filters of a red filter, a green filter and a blue filter, which are different from a light emitting color of the first light source.
Optionally, in some embodiments of the present application, each frame of the image display period includes two subframes, the backlight module includes a blue light source and a yellow light source, and in each frame of the image display period, the backlight module is configured to turn on the blue light source in one of the subframes and turn on the yellow light source in the other subframe.
Correspondingly, the present application further provides a backlight driving method of a liquid crystal display device, where the liquid crystal display device includes a liquid crystal display panel and a backlight module, the liquid crystal display panel includes an array substrate, a color film substrate, and a liquid crystal layer disposed between the array substrate and the color film substrate, and the backlight driving method of the liquid crystal display device includes:
dividing each frame of picture display period of the liquid crystal display panel into at least two subframes, wherein each subframe comprises a display stage and a dark state stage, and liquid crystal in the liquid crystal layer deflects line by line in the display stage;
the backlight module respectively provides light sources with different colors to the liquid crystal display panel in the subframes, and the backlight module emits light at least in the display stage.
Optionally, in some embodiments of the present application, the step of the backlight module emitting light at least in the display stage includes:
the backlight module emits light in the display stage and the dark state stage;
deflecting liquid crystal in the liquid crystal layer twice line by line in each of the subframes;
and when the liquid crystal in the liquid crystal layer deflects line by line for the second time, setting the voltage difference value at two ends of the liquid crystal in each line to be zero.
The application discloses a liquid crystal display device and a backlight driving method thereof. The liquid crystal display device comprises a liquid crystal display panel and a backlight module. The liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer arranged between the array substrate and the color film substrate. Each frame of picture display period of the liquid crystal display panel comprises at least two subframes, and each subframe comprises a display phase and a dark state phase. In the display phase, the liquid crystals in the liquid crystal layer are arranged to be deflected line by line. The backlight module is used for respectively providing light sources with different colors to the liquid crystal display panel in a plurality of sub-frames, and the backlight module is in a luminous state at least in a display stage. The application utilizes the color sequence method technology to provide light sources with different colors in different subframes, and can avoid the mischarging and color mixing between the adjacent subframes by inserting the dark state stage in each subframe. And because the backlight module is in a luminous state at least in the display stage of each subframe, the liquid crystal display panel is in a display mode after the deflection of each line of liquid crystal is finished, the display time is greatly increased, and the display brightness is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram of a first driving timing sequence of a liquid crystal display device provided in the present application;
FIG. 2 is a schematic diagram of a structure of a liquid crystal display device provided in the present application;
FIG. 3 is a schematic diagram of a second driving timing sequence of the LCD device provided in the present application;
fig. 4 is a flowchart illustrating a backlight driving method of a liquid crystal display device according to the present application;
fig. 5 is a schematic diagram of the specific steps of step 102 in fig. 4 provided herein.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention.
The embodiment of the application provides a liquid crystal display device and a backlight driving method thereof. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of a first driving timing sequence of a liquid crystal display device according to the present application. Fig. 2 is a schematic structural diagram of a liquid crystal display device provided in the present application. In the embodiment of the present application, the liquid crystal display device 1000 includes a liquid crystal display panel 100 and a backlight module 10.
Specifically, the liquid crystal display panel 100 includes an array substrate 20, a color filter substrate 40, and a liquid crystal layer 30 disposed between the array substrate 20 and the color filter substrate 40. Each frame of the lcd panel 100 includes at least two sub-frames T. Each subframe T includes a display phase T1 and a dark state phase T2. During the display period t1, the liquid crystals in the liquid crystal layer 30 are configured to deflect line by line. The backlight module 10 is used for providing a backlight source to the liquid crystal display panel 100. The backlight module 10 is disposed on a side of the array substrate 20 away from the liquid crystal layer 30. The backlight module 10 provides light sources of different colors to the lcd panel 100 in a plurality of sub-frames T, and is in a light-emitting state at least during the display period T1.
The backlight module 10 is provided with a backlight driving circuit for driving the light source of the backlight module 10 to emit light. The backlight driving circuit and the light source are not shown in the figure. The lcd device 1000 may further include a pixel electrode, a common electrode or other devices, and the specific arrangement and assembly of the lcd device 1000 are well known to those skilled in the art and will not be described herein.
It will be appreciated that the liquid crystal is deflected by the pixel voltage and the common voltage across it. The larger the voltage difference value at two ends of the liquid crystal is, the larger the deflection angle of the liquid crystal is, and the higher the brightness of the transmitted light is. Therefore, in the embodiment of the present application, the display period t1 indicates that after each line of liquid crystal is deflected by a corresponding angle, a certain intensity of light can be transmitted. The corresponding pixels (not shown) of each row of liquid crystal display can display the corresponding picture. The dark state period t2 indicates that the pixels corresponding to each row of liquid crystal are not displaying. Specifically, the backlight module 10 may be turned off in the dark state period t2, or the liquid crystal cannot transmit light because the deflection angle of the liquid crystal is 0 in the dark state period t 2. The details will be described in the following embodiments, which are not described herein.
Here, in the display period t1, the liquid crystal in the liquid crystal layer 30 is configured to be deflected line by line. Therefore, each line of liquid crystal corresponds to the scan mode 11, the deflection mode 12, and the display mode 13. In scan mode 11, the driving circuit corresponding to each row of liquid crystal receives a corresponding scan signal, so that the pixel electrode of the corresponding pixel can be switched on to display the required pixel voltage. The corresponding liquid crystal enters the liquid crystal deflection mode 12 under the action of the pixel voltage and the common voltage at both ends thereof, and is deflected. Since the backlight module 10 is in the light-emitting state at least during the display period t1, after each line of liquid crystal is deflected, the corresponding pixel is in the display mode 13. Wherein, each row of pixels are not displayed at the same time. That is, each row of pixels is in a display state in the display mode 13, but the display of each row of pixels is not performed at the same time, thereby increasing the display time.
In the embodiment of the present application, the color sequential method is used to switch different light sources in the backlight module 10 according to a time sequence, so as to provide light sources with different colors in different sub-frames T of the same frame of the display period. And by inserting the dark state phase T2 in each sub-frame T, it is able to avoid the occurrence of mischarging or color mixing between adjacent sub-frames T. In addition, since the backlight module 10 is in the light-emitting state at least at the display stage T1 of each sub-frame T, after the liquid crystal deflection of each line is completed, the liquid crystal display panel 100 is in the display mode, the display time is greatly increased, and the display brightness of the liquid crystal display device 1000 is effectively improved.
In the embodiment of the present application, the liquid crystal in the liquid crystal layer 30 is configured to be deflected twice line by line in each sub-frame T. The display period T1 corresponds to a period from the first row of liquid crystal in the current sub-frame T to the last row of liquid crystal in the current sub-frame T starting to deflect for the first time. The dark state period T2 corresponds to the time period from the second deflection of the last row of liquid crystal in the current sub-frame T to the first deflection of the first row of liquid crystal in the next sub-frame T.
In the embodiment of the present application, by configuring the liquid crystal in the liquid crystal layer 30 to deflect twice line by line, the deflection state of the liquid crystal in the display stage t1 can be changed, and the characteristic damage caused by the long-term liquid crystal being in the same deflection state is avoided, so that the liquid crystal display panel 100 cannot normally display.
Further, in the embodiment of the present application, the backlight module 10 is in the light-emitting state in both the display period t1 and the dark state period t 2. When the liquid crystals in the liquid crystal layer 30 are deflected a second time, row by row, the voltage difference across each row of liquid crystals is zero.
It will be appreciated that the liquid crystal in the liquid crystal layer 30 is configured to be deflected twice row by row within each sub-frame T. Then, in the display period t1, when the pixels corresponding to the last row of liquid crystal are displayed, the liquid crystal of the partial row before the last row of liquid crystal is deflected twice. During the dark state period t2, the liquid crystals in the liquid crystal layer 30 are deflected for the second time.
When the liquid crystal in the liquid crystal layer 30 deflects line by line for the second time, the voltage difference value at the two ends of each line of liquid crystal is set to be zero, so that the liquid crystal is restored to the original position, and the light transmission amount is zero. Further, the liquid crystal display panel 100 is always in the dark state mode during the second deflection of the liquid crystal layer 30, thereby avoiding the mis-charging. Thus, the backlight module 10 can be always in the on state. Thereby simplifying the control circuit of the backlight module 10. In addition, the liquid crystal layer 30 is restored to the original position at the dark state stage T2, so that the liquid crystal is deflected to the corresponding position when the next sub-frame T starts, and the display efficiency of the liquid crystal display panel 100 is improved.
Referring to fig. 2 and 3, fig. 3 is a schematic diagram of a second driving timing of the liquid crystal display device according to the present application. The difference between the driving timing sequence of the lcd 1000 shown in fig. 1 is that, in the embodiment of the present application, the backlight module 10 is in the light-emitting state during the display period t1, and the backlight module 10 is in the off state during the dark state period t 2.
It can be understood that, since the backlight module 10 is in the off state during the dark state period t2, even if the liquid crystal in the liquid crystal layer 30 is deflected during the dark state period t2, the liquid crystal display panel 100 cannot display during the dark state period t2 without the backlight source, thereby avoiding the display error. In addition, the backlight module 10 is turned off in the dark state period t2, so that the power consumption is reduced.
Further, as can be seen from the foregoing analysis, when the pixels corresponding to the last row of liquid crystal display perform displaying, the liquid crystal in the partial row before the last row of liquid crystal display has already undergone two deflections. By controlling the timing of the scanning signal or extending the display time of the pixels corresponding to the first rows of liquid crystals, it can be ensured that the backlight module 10 is turned off when the first row of liquid crystals is deflected for the second time. That is, when the first row of liquid crystals is deflected for the second time, the dark state period t2 is entered, and the liquid crystal display panel 100 will not emit light when the liquid crystal layer 30 is deflected for the second time.
Of course, the backlight module 10 may not be turned off when the first row of liquid crystals is deflected for the second time. In order to avoid the display error of the liquid crystal display panel 100 when the liquid crystal layer 30 is deflected for the second time, the voltage difference between the two ends of each row of liquid crystal is set to be zero when the liquid crystal in the liquid crystal layer 30 is deflected for the second time row by row.
As mentioned above, the liquid crystal is deflected by the pixel voltage and the common voltage across it. The larger the voltage difference value at two ends of the liquid crystal is, the larger the deflection angle of the liquid crystal is, and the higher the brightness of the transmitted light is. The voltage difference value through setting up the liquid crystal both ends is zero for the liquid crystal resumes to the original position, and the printing opacity is zero. On the one hand, the liquid crystal display panel 100 is always in the dark state mode during the second deflection of the liquid crystal layer 30. On the other hand, the liquid crystal layer 30 is restored to the original position at the dark state stage T2, so that the liquid crystal is deflected to the corresponding position when the next sub-frame T starts, and the display efficiency of the liquid crystal display panel 100 is improved.
In the embodiment of the present application, the ratio of the light emitting time duration of the display period t1 in one frame of the display period is at least 1/2. It can be understood that, since the liquid crystal display panel 100 is in the display mode after the liquid crystal charging of each row is completed, the display time is greatly increased, and therefore, the light emitting time of the display period t1 is higher. When the liquid crystal layer 30 is scanned twice and deflected for the same time in each sub-frame T, the light emitting duration of the display period T1 is about 1/2. Of course, in some embodiments, if the time for the first scanning and deflecting of the liquid crystal layer 30 is controlled to be longer than the time for the second scanning and deflecting, the ratio of the light emitting time duration of the display period t1 may be greater than 1/2, and may be specifically set according to the timing sequence of the actual scanning signal.
In the embodiment of the present application, each frame of the image display period includes at least two subframes T. For example, each frame of the image display period includes two sub-frames T, and the backlight module 10 includes light sources of two colors. Each frame of the image display period includes three sub-frames T, and the backlight module 10 includes three color light sources, such as three primary colors of red, green and blue. This is not a particular limitation of the present application.
In the embodiment of the present application, each frame of the image display period includes two subframes T. The backlight module 10 includes a white light source and a first light source (not shown). The first light source is any one of a red light source, a green light source, and a blue light source. The liquid crystal display panel 100 includes two filters of a red filter, a green filter, and a blue filter, which are different from the emission color of the first light source.
For example, the first light source is a blue light source. The liquid crystal display panel 100 includes a red filter and a green filter. In each frame of the image display period, the backlight module 10 is configured to turn on the white light source in one of the sub-frames T, and the white light source emits red light and green light under the action of the red filter and the green filter. The backlight module 10 is then used to turn on the blue light source in another sub-frame T to emit blue light. The temporal color mixing is adopted, and the normal display of the liquid crystal display panel 100 can be realized. On one hand, since the backlight module 10 only needs to switch between the light sources of two colors, the number of the sub-frames T is reduced, and the display duration is further increased. On the other hand, because a color filter is omitted, the brightness loss caused by the fact that the color filter absorbs light and the pixel aperture ratio is small is reduced to a certain extent.
In some embodiments of the present application, each frame of the picture display period includes two subframes T. The backlight module 10 includes a blue light source and a yellow light source. In each frame of the image display period, the backlight module 10 is used for turning on the blue light source in one of the sub-frames T and for turning on the yellow light source in the other sub-frame T.
It can be understood that, in the embodiment of the present application, by providing the blue light source and the yellow light source in the backlight module 10, the normal display of the display image can be realized without providing a color filter in the liquid crystal display panel 100. On the one hand, only two light sources with different colors are arranged in the backlight module 10, and the light sources with two colors in the backlight module 10 are switched according to the time sequence, so that the light sources with different colors are respectively provided in the two sub-frames T. Compared with the conventional method of switching the light sources of the three primary colors in time sequence, the display duration of the display stage t1 is further increased. On the other hand, the arrangement of a color filter is completely omitted, and the brightness loss caused by the fact that the color filter absorbs light and the pixel aperture ratio is small is effectively reduced.
The liquid crystal display device 1000 according to the embodiment of the present application can be applied to an active matrix type led backlight liquid crystal display, an active matrix type mini led backlight liquid crystal display, or an active matrix type micro led backlight liquid crystal display. The liquid crystal display device 1000 may be an electronic device having a display function, such as a mobile phone, a tablet computer, a notebook computer, a game machine, a digital camera, a car navigation device, an electronic billboard, an automatic teller machine, and the like.
Correspondingly, the application also provides a backlight driving method of the liquid crystal display device. Specifically, please refer to fig. 1, fig. 2 and fig. 4, wherein fig. 4 is a flowchart illustrating a backlight driving method of a liquid crystal display device according to the present application. As shown in fig. 1 and 2, the liquid crystal display device 1000 includes a liquid crystal display panel 100 and a backlight module 10. The liquid crystal display panel 100 includes an array substrate 20, a color filter substrate 40, and a liquid crystal layer 30 disposed between the array substrate 20 and the color filter substrate 40. As shown in fig. 4, the backlight driving method of the liquid crystal display device 1000 includes the steps of:
101. dividing each frame of picture display period of the liquid crystal display panel into at least two subframes, wherein each subframe comprises a display stage and a dark state stage, and liquid crystal in the liquid crystal layer deflects line by line in the display stage.
Wherein each frame picture display period may be divided into two subframes T, three subframes T, or more subframes T. Specifically, the color setting may be performed according to the color requirement of the display screen, which is not specifically limited in this application.
The present embodiment is described by taking an example of dividing each frame of the screen display period into two subframes T, but the present invention is not limited thereto. Each subframe T includes a display phase T1 and a dark state phase T2. In the display period t1, the liquid crystals in the liquid crystal layer 30 are deflected line by line to a corresponding angle to display the required brightness through the picture.
102. The backlight module respectively provides light sources with different colors to the liquid crystal display panel in the subframes, and the backlight module emits light at least in the display stage.
When each frame of the image display period is divided into two sub-frames T, the backlight module 10 may include light sources of two colors, and the light sources of different colors are respectively provided to the liquid crystal display panel 100 in the two sub-frames T. Specifically, the setting of the light source in the backlight module 10 can refer to the above embodiments, and is not described herein again.
The backlight module 10 is in a light-emitting state at least at the display stage T1 of each sub-frame T, and after the liquid crystal deflection of each line is completed, the liquid crystal display panel 100 is in a display mode, so that the display time is greatly increased, and the display brightness of the liquid crystal display device 1000 is effectively improved.
Further, please refer to fig. 5, fig. 5 is a schematic diagram illustrating a specific step of step 102 in fig. 4 according to the present application. In some embodiments of the present application, step 102 specifically includes the following steps:
1021. the backlight module emits light in the display stage and the dark state stage.
The backlight module 10 emits light in both the display period t1 and the dark period t2, i.e., the backlight module 10 can be always turned on. Therefore, the control of the backlight module 10 when the backlight source is switched between the display stage t1 and the dark state stage t2 can be simplified, and the circuit difficulty can be reduced.
1022. Liquid crystal in the liquid crystal layer is deflected twice line by line within each of the subframes.
Here, by controlling the scanning signal of the liquid crystal display device 1000, the liquid crystal in the liquid crystal layer 30 can be deflected twice line by line in each sub-frame T. The liquid crystal deflects twice line by line, so that the deflection state of the liquid crystal in the display stage t1 can be changed, and the characteristic damage caused by the long-term same deflection state of the liquid crystal is avoided, and the liquid crystal display panel 100 cannot normally display.
1023. And when the liquid crystal in the liquid crystal layer deflects line by line for the second time, setting the voltage difference value at two ends of the liquid crystal in each line to be zero.
Wherein the liquid crystal is deflected by the pixel voltage and the common voltage across it. The larger the voltage difference value at two ends of the liquid crystal is, the larger the deflection angle of the liquid crystal is, and the higher the brightness of the transmitted light is. When the liquid crystal in the liquid crystal layer 30 is deflected line by line for the second time, the voltage difference across the liquid crystal of each line is set to zero, and the liquid crystal layer 30 is restored to the original position. The liquid crystal display panel 100 is always in the dark state mode during the second deflection of the liquid crystal layer 30. Thus, even if the backlight module 10 is always in the on state, the wrong charging can be avoided. In addition, the liquid crystal layer 30 is restored to the original position at the dark state stage T2, so that the liquid crystal is deflected to the corresponding position when the next sub-frame T starts, and the display efficiency of the liquid crystal display panel 100 is improved.
Of course, in other embodiments of the present application, in step 102, the backlight module 10 may also emit light normally in the display phase t1 and be turned off in the dark phase t2 to reduce power consumption, which is not described herein again.
The liquid crystal display device and the backlight driving method thereof provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are explained herein by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A liquid crystal display device, comprising:
the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer arranged between the array substrate and the color film substrate, wherein each frame of picture display period of the liquid crystal display panel comprises at least two subframes, each subframe comprises a display stage and a dark state stage, and liquid crystal in the liquid crystal layer is configured to deflect line by line in the display stage;
the backlight module is arranged on one side of the array substrate, which is far away from the liquid crystal layer, and is used for respectively providing light sources with different colors to the liquid crystal display panel in the plurality of sub-frames and at least being in a light-emitting state in the display stage.
2. The liquid crystal display device according to claim 1, wherein in each of the subframes, liquid crystal in the liquid crystal layer is configured to be deflected twice row by row;
the display stage corresponds to a time period from the first row of liquid crystals of the current sub-frame starting to deflect for the first time to the last row of liquid crystals starting to deflect for the second time, and the dark state stage corresponds to a time period from the last row of liquid crystals of the current sub-frame starting to deflect for the second time to the first row of liquid crystals of the next sub-frame starting to deflect for the first time.
3. The LCD device of claim 2, wherein the backlight module is in a light-emitting state during the display phase and the dark-state phase;
and when the liquid crystal in the liquid crystal layer deflects line by line for the second time, the voltage difference value of the two ends of the liquid crystal in each line is zero.
4. The LCD device of claim 2, wherein the backlight module is in an off state during the dark state.
5. A liquid crystal display device as claimed in claim 4, characterized in that the voltage difference across the liquid crystal of each line is zero when the liquid crystal in the liquid crystal layer is deflected a second time line by line.
6. The liquid crystal display device according to claim 1, wherein the display period has a light emission time ratio of at least 1/2 in each of the subframes.
7. The LCD device of claim 1, wherein each frame display period comprises two sub-frames, the backlight module comprises a white light source and a first light source, the first light source is any one of a red light source, a green light source and a blue light source, and the LCD panel comprises two filters of the red filter, the green filter and the blue filter, which have different colors from the first light source.
8. The LCD device of claim 1, wherein each frame display period comprises two sub-frames, the backlight module comprises a blue light source and a yellow light source, and the backlight module is configured to turn on the blue light source in one of the sub-frames and turn on the yellow light source in the other sub-frame during each frame display period.
9. The backlight driving method of the liquid crystal display device is characterized in that the liquid crystal display device comprises a liquid crystal display panel and a backlight module, the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer arranged between the array substrate and the color film substrate, and the backlight driving method of the liquid crystal display device comprises the following steps:
dividing each frame of picture display period of the liquid crystal display panel into at least two subframes, wherein each subframe comprises a display stage and a dark state stage, and liquid crystal in the liquid crystal layer deflects line by line in the display stage;
the backlight module respectively provides light sources with different colors to the liquid crystal display panel in the subframes, and the backlight module emits light at least in the display stage.
10. The method of claim 9, wherein the step of the backlight module emitting light at least during the display period comprises:
the backlight module emits light in the display stage and the dark state stage;
deflecting liquid crystal in the liquid crystal layer twice line by line in each of the subframes;
and when the liquid crystal in the liquid crystal layer deflects line by line for the second time, setting the voltage difference value at two ends of the liquid crystal in each line to be zero.
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