CN109166553B - Liquid crystal display device and driving method thereof - Google Patents
Liquid crystal display device and driving method thereof Download PDFInfo
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- CN109166553B CN109166553B CN201811214592.1A CN201811214592A CN109166553B CN 109166553 B CN109166553 B CN 109166553B CN 201811214592 A CN201811214592 A CN 201811214592A CN 109166553 B CN109166553 B CN 109166553B
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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
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
The invention relates to a liquid crystal display device and a driving method thereof. The liquid crystal display device comprises a liquid crystal display panel, a backlight module and a control circuit, wherein the liquid crystal display panel comprises n display areas, the backlight module comprises n backlight areas which are in one-to-one correspondence with the n display areas, n is a natural number which is more than or equal to 2, each backlight area is used for providing backlight for the corresponding display area, the control circuit is electrically connected with the liquid crystal display panel and the backlight module, for sequentially scanning the n display regions and applying corresponding gray scale voltage signals to the n display regions and controlling the light emission of the n backlight regions, in the time period that the ith display area is scanned, the corresponding gray scale voltage signal is applied to the ith display area, the ith backlight area corresponding to the ith display area is closed, and the backlight areas except the ith backlight area are all opened, wherein i is a natural number which is more than or equal to 1 and less than or equal to n.
Description
Technical Field
The invention relates to a liquid crystal display device and a driving method thereof.
Background
With the progress of technology, flat panel display devices have been widely used in various fields, especially liquid crystal display devices, and have superior characteristics of light weight, low power consumption and no radiation, so that they have gradually replaced the conventional cathode ray tube display devices and are applied to various electronic products, such as mobile phones, portable multimedia devices, notebook computers, liquid crystal televisions and liquid crystal display screens. However, due to the retention characteristics of the liquid crystal, the liquid crystal display is prone to generate a motion blur phenomenon when displaying a dynamic image.
Disclosure of Invention
A liquid crystal display device comprises a liquid crystal display panel, a backlight module and a control circuit, wherein the liquid crystal display panel comprises n display areas, the backlight module comprises n backlight areas which are in one-to-one correspondence with the n display areas, n is a natural number which is more than or equal to 2, each backlight area is used for providing backlight for the corresponding display area, the control circuit is electrically connected with the liquid crystal display panel and the backlight module, for sequentially scanning the n display regions and applying corresponding gray scale voltage signals to the n display regions and controlling the light emission of the n backlight regions, in the time period that the ith display area is scanned, the corresponding gray scale voltage signal is applied to the ith display area, the ith backlight area corresponding to the ith display area is closed, and the backlight areas except the ith backlight area are all opened, wherein i is a natural number which is more than or equal to 1 and less than or equal to n.
In one embodiment, n is a natural number equal to or greater than 3.
In one embodiment, the control circuit includes a display signal conditioning unit, a backlight signal conditioning unit, the display device comprises a scanning driving unit and a data driving unit, wherein the display signal adjusting unit is used for generating and outputting a first correction time sequence control signal to the scanning driving unit and the data driving unit according to an original time sequence control signal, the scanning driving unit is used for generating and sequentially outputting scanning signals according to the first correction time sequence control signal so as to scan n display areas, the data driving unit is used for converting the original data signal into a gray scale voltage signal and controlling the gray scale voltage signal to be sequentially applied to the n display areas according to the first correction time sequence control signal, the backlight signal adjusting unit is used for generating a first correction backlight control signal according to the original backlight control signal, and the first correction backlight control signal is used for controlling the light emission of the n backlight areas of the backlight module.
In one embodiment, the original timing control signal includes at least one of an original horizontal synchronization signal, an original vertical synchronization signal, an original pixel clock signal, and an original enable signal, and the first correction timing control signal includes at least one of a first horizontal synchronization correction signal, a first vertical synchronization correction signal, a first pixel clock correction signal, and a first correction enable signal; the original backlight control signal comprises a pulse width signal and the first corrected backlight control signal comprises a first pulse width correction signal.
In one embodiment, it is assumed that the light emission intensities of the n backlight regions corresponding to the original backlight control signal are all the first intensity during the display time of the one frame picture, the light emission intensity of the i-th backlight region corresponding to the first correction backlight control signal during the period when the i-th display region is scanned is the second intensity, the second intensity is greater than the first intensity, and the light emission amounts of the n backlight regions corresponding to the original backlight control signal during the display time of the one frame picture are equal to the light emission amounts of the n backlight regions corresponding to the first correction backlight control signal during the display time of the one frame picture.
In one embodiment, the control circuit further comprises a control signal processing unit, the liquid crystal display device comprises a first display mode and a second display mode, the control signal processing unit controls the liquid crystal display device to enter the first display mode or the second display mode, in the first display mode, the control signal processing unit controls the display signal adjusting unit to generate and output a first correction timing control signal to the scan driving unit and the data driving unit according to the original timing control signal and controls the backlight signal adjusting unit to generate a first correction backlight control signal according to the original backlight control signal, the scan driving unit generates and sequentially outputs scan signals to scan n display regions according to the first correction timing control signal, the data driving unit converts the original data signal into a gray scale voltage signal and controls to sequentially apply the gray scale voltage signal to the n display regions according to the first correction timing control signal, n backlight areas of the backlight module emit light under the control of a first correction backlight control signal, wherein in the scanning time period of the ith display area, a corresponding gray scale voltage signal is applied to the ith display area, the ith backlight area corresponding to the ith display area is closed, and the backlight areas except the ith backlight area are all opened; in the second display mode, the control signal processing unit controls the display signal adjusting unit to generate and output a second correction timing control signal to the scan driving unit and the data driving unit according to the original timing control signal and controls the backlight signal adjusting unit to generate a second correction backlight control signal according to the original backlight control signal, a frame display time is divided into a scan period and a sustain period, the scan driving unit generates and outputs a scan signal according to the second correction timing control signal in the scan period to sequentially scan the n display regions, the data driving unit converts the original data signal into a gray scale voltage signal and controls the gray scale voltage signal to be sequentially applied to the n display regions in the scan period according to the second correction timing control signal, the liquid crystal display device enters the sustain period from the scan period after the scan signal is applied to each of the plurality of scan lines in the scan period, the second correction backlight control signal controls n backlight areas of the backlight module to be closed in a scanning period and to be opened in a maintaining period.
In one embodiment, the first display mode is a virtual reality display mode, and the second display mode is a normal display mode.
In one embodiment, the control signal processing unit is configured to generate a first mode control signal and a second mode control signal based on a user selection or a satisfaction of a preset detection condition, and send the first mode control signal or the second mode control signal to the display signal adjusting unit and the backlight signal adjusting unit to control the display signal adjusting unit and the backlight signal adjusting unit.
In one embodiment, it is assumed that the light emission intensities of the n backlight areas corresponding to the original backlight control signal are all the first intensity during the display time of one frame, the light emission intensities of the n backlight areas of the backlight module corresponding to the second correction backlight control signal during the sustain period are the third intensity, the third intensity is greater than the first intensity, and the light emission amounts of the n backlight areas corresponding to the original backlight control signal during the display time of one frame are equal to the light emission amounts of the n backlight areas corresponding to the second correction backlight control signal during the display time of one frame.
A driving method of a liquid crystal display device comprises a liquid crystal display panel with n display areas and a backlight module with backlight areas corresponding to the n display areas one by one, wherein the ith backlight area is used for providing backlight for the corresponding ith display area, n is a natural number which is more than or equal to 2, and i is a natural number which is more than or equal to 1 and less than or equal to n, and the driving method comprises the following steps:
controlling the 1 st to i-1 st backlight areas, the i +1 th to nth backlight areas to be on for light emission and the ith backlight area to be off;
providing a scanning signal to the ith display area; and
and applying a corresponding gray scale voltage signal to the ith display area.
In one embodiment, the driving method includes the steps of:
outputting a first display mode control signal or a second display mode control signal,
when a first display mode control signal is output, controlling the 1 st to i-1 st backlight areas, the i +1 th to nth backlight areas to be on for light emission and the ith backlight area to be off; providing a scanning signal to the ith display area; applying a corresponding gray scale voltage signal to the ith display area;
when the second display mode control signal is outputted, the display time of one frame is divided into a scan period and a sustain period,
outputting scanning signals to scan n display regions in sequence in a scanning period, applying gray scale voltage signals to the n display regions in sequence, and controlling the n backlight regions to be closed,
and controlling the n backlight areas to be simultaneously turned on in the maintaining period.
Compared with the prior art, in the liquid crystal display device and the driving method thereof, the liquid crystal display panel and the backlight module are partitioned, so that the corresponding gray scale voltage signal is applied to the ith display area in the scanning time period of the ith display area, the ith backlight area corresponding to the ith display area is closed, and the backlight areas except the ith backlight area are all opened, the reaction time window of the liquid crystal in rotation can be reduced, the chance of being detected by the outside is reduced, and the dynamic ghost phenomenon is further improved.
Drawings
Fig. 1 is a block diagram of a liquid crystal display device according to a preferred embodiment of the invention.
Fig. 2 is an equivalent circuit diagram of a liquid crystal display panel of the liquid crystal display device shown in fig. 1.
FIG. 3 is a schematic plan view of a backlight module of the LCD device shown in FIG. 1.
Fig. 4 is a schematic perspective view of an embodiment of the backlight module shown in fig. 3.
Fig. 5 is a schematic perspective view of another embodiment of the backlight module shown in fig. 3.
Fig. 6 is a schematic diagram of driving waveforms of the liquid crystal display device shown in fig. 1 in the first display mode.
Fig. 7 is a schematic diagram of driving waveforms of the liquid crystal display device shown in fig. 1 in a second display mode.
FIG. 8 is a flowchart illustrating a driving method of a liquid crystal display device according to a preferred embodiment of the present invention.
Fig. 9 is a schematic diagram of a part of a control circuit of an embodiment of the liquid crystal display device shown in fig. 1.
Description of the main elements
Liquid crystal display device 10
Liquid crystal display panel 11
Control signal processing unit 131
Display signal adjusting unit 132
Backlight signal adjusting unit 133
Scan driving unit 134
Light guide plate 122'
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic block diagram of a liquid crystal display device 10 according to an embodiment of the invention. The liquid crystal display device 10 includes a liquid crystal display panel 11, a backlight module 12 and a control circuit 13. The backlight module 12 is used for providing backlight to the liquid crystal display panel 11, and the liquid crystal display panel 11 is used for receiving the backlight and displaying pictures. The control circuit 13 is electrically connected to the liquid crystal display panel 11 and the backlight module 12, and is configured to control light emission of the backlight module 12 and image display of the liquid crystal display panel 11.
The control circuit 13 includes a control signal processing unit 131, a display signal adjusting unit 132, a backlight signal adjusting unit 133, a scan driving unit 134, and a data driving unit 135. The control signal processing unit 131 is electrically connected to the display signal adjusting unit 132 and the backlight signal adjusting unit 133. The display signal adjusting unit 132 is electrically connected to the scan driving unit 134 and the data driving unit 135. The scan driving unit 134 and the data driving unit 135 may be a scan driving chip and a data driving chip, respectively, and are electrically connected to the liquid crystal display panel 11. The backlight signal adjusting unit 133 is electrically connected to the backlight module 12.
The liquid crystal display panel 11 includes n display regions 110, where n is a natural number equal to or greater than 2. The 1-n display regions 110 are sequentially arranged in a direction away from the data driving unit 135. In one embodiment, n is a natural number greater than or equal to 3, i.e., the liquid crystal display panel 11 includes at least three display regions 110.
Referring to fig. 2, fig. 2 is an equivalent circuit diagram of the liquid crystal display panel 11 of the liquid crystal display device 10 shown in fig. 1. The liquid crystal display panel 11 further includes a plurality of scan lines 111 arranged in parallel at intervals, a plurality of data lines 112 arranged in parallel at intervals and perpendicular to the scan lines 111, and pixel units 113 located in a smallest rectangular region formed by the intersection of the scan lines 111 and the data lines 112. The plurality of pixel units 113 defined by the intersection of the scan line 111 and the data line 112 form a matrix of pixel units arranged in an array.
Each pixel unit 113 may include a transistor 114 and a liquid crystal capacitor 115, in this embodiment, the transistor 114 may be a thin film transistor, a gate is connected to the corresponding scan line 111, a source is connected to the corresponding data line 112, and a drain is connected to the liquid crystal capacitor 115.
In this embodiment, each display region 110 is a rectangular strip region extending along the direction of the scan line 111, and the 1 to n display regions 110 are sequentially arranged along the direction of the data line 112, and each display region 110 may correspond to 1 row, two rows, or multiple rows of pixel units 113, and may be specifically set according to actual requirements.
Referring to fig. 3, fig. 3 is a schematic plan view of the backlight module 12 of the liquid crystal display device 10 shown in fig. 1. The backlight module 12 includes n backlight regions 120 corresponding to the n display regions 110, and each backlight region 120 may be located right below a corresponding display region 110 and configured to provide backlight to a corresponding display region 110, where the light emitting brightness and the on/off of each backlight region 120 may also be controlled individually. The backlight module 12 may be a direct type backlight module or a side type backlight module, and may be selected according to actual requirements.
Referring to fig. 4, fig. 4 is a schematic perspective view of the backlight module 12 shown in fig. 3 according to an embodiment. In the embodiment, the backlight module 12 is a direct-type backlight module, and includes a plurality of light sources 121 arranged in an array and an optical film 122 located above the plurality of light sources 121. The light source 121 may be a white LED but is not limited thereto. The light source film 121 may be one, two or more, and may be a diffusion sheet, a light guide plate, or the like, which may be selected according to actual needs. The light sources 121 corresponding to each backlight area 120 and the light sources 121 corresponding to the other backlight areas 120 may be electrically connected to each other independently, so that the light sources 121 corresponding to each backlight area 120 may be controlled to emit light independently, and turned on or turned off, and thus the light emission luminance, the turning on or the turning off of each backlight area 120 may be controlled independently.
Referring to fig. 5, fig. 5 is a schematic perspective view of another embodiment of the backlight module 12 shown in fig. 3. In the embodiment, the backlight module 12 is a side-in type backlight module, and includes a light guide plate 122 ' and a plurality of light sources 121 ' linearly arranged at one side of the light guide plate 122 '. The light source 121' may be a white LED but is not limited thereto. A diffusion sheet, a brightness enhancement sheet, etc. may be further disposed above the light guide plate 122', which will not be described herein. In an embodiment, the light source 121 ' corresponding to each backlight area 120 and the light source 121 ' corresponding to the other backlight areas 120 may be independent from each other, so that the light source 121 ' corresponding to each backlight area 120 may be controlled to emit light, turned on or turned off individually, and thus the light emitting brightness, the turning on or the turning off of each backlight area 120 may be controlled individually.
In this embodiment, the liquid crystal display device 10 includes a first display mode and a second display mode, and the control signal processing unit 131 can control the liquid crystal display device 10 to enter the first display mode or the second display mode. The first display mode may be a virtual reality display mode, and the second display mode may be a normal display mode. The control signal processing unit 131 may generate a first mode control signal and a second mode control signal based on a user's selection or satisfaction of a preset detection condition, and send the first mode control signal or the second mode control signal to the display signal adjusting unit 132 and the backlight signal adjusting unit 133 to control the display signal adjusting unit 132 and the backlight signal adjusting unit 133. The user can select the first display mode or the second display mode by manipulating the display menu or the button, thereby controlling the signal processing unit 131 to generate and output the first mode control signal and the second mode control signal.
The predetermined detection condition may be a change in the format of the image data received by the control circuit 13, such as a difference between the data format of the normal display data and the data format of the virtual display data, and the first mode control signal or the second mode control signal may be generated by detecting the data format. The preset detection condition may be that a preset gesture, an action or a touch action is detected, so as to generate the first mode control signal or the second mode control signal according to different preset gestures, actions or touch actions. However, the above is only an exemplary illustration, and the preset detection adjustment may be set to other values according to actual needs, and is not limited to the above.
Referring to fig. 6, fig. 6 is a schematic diagram of driving waveforms of the liquid crystal display device 10 shown in fig. 1 in the first display mode. As shown in fig. 6(a) and (c), when the liquid crystal display device 10 enters the first display mode, i.e., the control signal processing unit 131 sends the first mode control signal to the display signal adjusting unit 132 and the backlight signal adjusting unit 133, the display signal adjusting unit 132 generates and outputs the first calibration timing control signal to the scan driving unit 134 and the data driving unit 135 according to the original timing control signal.
The backlight signal adjusting unit 133 generates a first corrected backlight control signal according to the original backlight control signal. The scan driving unit 134 generates and sequentially outputs scan signals to the scan lines 111 according to the first calibration timing control signal to scan the n display regions 110. The data driving unit 135 converts the original data signal into a gray scale voltage signal and sequentially applies the gray scale voltage signal to the data lines 112 of the n display regions 110 according to the first calibration timing control signal, the transistor 114 is turned on, the gray scale voltage signal is written into the liquid crystal capacitor 115, and the n backlight regions 120 of the backlight module 12 emit light under the control of the first calibration backlight control signal.
In the first display mode, in a time period in which the scan line of the ith display area 110 is scanned, the data line of the ith display area 110 is applied with a corresponding gray scale voltage signal, the ith backlight area 120 corresponding to the ith display area 110 is turned off, the backlight areas 120 other than the ith backlight area 120 are all turned on, and i is a natural number greater than or equal to 1 and less than or equal to n.
The original timing control signal includes at least one of an original horizontal synchronization signal (H-sync), an original vertical synchronization signal (V-sync), an original pixel clock signal (V-CLK), and an original enable signal (OE). The first correction timing control signal includes at least one of a first horizontal synchronization correction signal, a first vertical synchronization correction signal, a first pixel clock correction signal, and a first correction enable signal. The original timing control signals, including the original vertical synchronization signal V-sync and the first vertical synchronization correction signal V-sync1, are illustrated in FIGS. 6(a) and (c).
The horizontal synchronization signal is used to control the timing of the scanning signal applied to the scanning line 111, and in the present embodiment, the first horizontal synchronization correction signal may be obtained by correcting the original horizontal synchronization signal. The width (or high level duration, i.e. gate on time) of the scanning signal applied to each scanning line 111 corresponding to the original horizontal synchronizing signal is greater than the width of the scanning signal applied to each scanning line 111 and the width of the gray scale voltage signal applied to each data line 112 corresponding to the first corrected horizontal synchronizing signal, so that the turn-on time of each transistor 114 and the time for writing the gray scale voltage signal into the liquid crystal capacitor 114 are reduced; correspondingly, the first vertical synchronization correction signal V-sync1 is obtained by correcting the vertical horizontal synchronization signal V-sync. In one embodiment, the digital format of the vertical horizontal synchronization signal V-sync may be modified by digital modulation to correct it to the first vertical synchronization correction signal V-sync 1. Of course, in another embodiment, if the vertical horizontal synchronization signal V-sync is in analog format, the vertical horizontal synchronization signal V-sync as shown in FIG. 6(a) can be corrected to the first vertical horizontal synchronization signal V-sync1 as shown in FIG. 6(b) by the corresponding logic switch circuit.
The display time T1 of a frame corresponding to the original vertical synchronization signal V-sync is greater than the display time T2 of a frame corresponding to the first corrected vertical synchronization signal V-sync1, so that the start time and the end time of each frame of the frame are changed, and the original vertical synchronization signal V-sync needs to be corrected to the first vertical synchronization correction signal V-sync 1. Based on the variation of the horizontal synchronization signal and the vertical synchronization signal, the pixel clock signal and the enable signal are also adjusted accordingly, so that the first pixel clock calibration signal can be generated according to the original pixel clock signal and the first calibration enable signal can be generated according to the original enable signal according to actual needs.
As shown in fig. 6(b) and (d), the original backlight control signal may include an original pulse width signal (PWM), the first corrected backlight control signal includes a first pulse width correction signal (New PWM 1), and the first pulse width correction signal New PWM 1 may also be obtained by correcting the original pulse width signal PWM, wherein the current applied to the light source of the backlight module may be adjusted by adjusting the frequency and duty ratio of the first pulse width correction signal New PWM 1, so as to control the brightness and the switching of each backlight area 120 of the backlight module 12.
Assuming that the light emission intensities of the n backlight regions 120 corresponding to the original backlight control signal are all the first intensity at the display time T1 of one frame, in the first display mode, the light emission intensity of the ith backlight region corresponding to the first correction backlight control signal in the time period Ts during which the ith display region 110 is scanned is the second intensity, wherein the second intensity is greater than the first intensity, but in order to ensure accurate restoration of the display data and the brightness, the light emission amount of the n backlight regions 120 corresponding to the original backlight control signal at the display time T1 of one frame is substantially equal to the light emission amount of the n backlight regions 120 corresponding to the first correction backlight control signal at the display time T2 of one frame.
Since the light source of the backlight module 12 is driven by current, the light emitting intensity of the n backlight regions 120 is consistent with the driving current intensity of the light source of the n backlight regions 120, therefore, it is assumed that the driving current intensity (BLU) of the n backlight regions 120 corresponding to the original backlight control signal is the first current intensity at the display time of one frame, and in the first display mode, the driving current intensity (New BLU 1) of the ith backlight region 120 corresponding to the first corrected backlight control signal in the scanning period of the ith display region 110 is the second current intensity, and the second current intensity is greater than the first current intensity. In order to ensure accurate restoration of the display data and brightness, the power consumption of the n backlight regions 120 corresponding to the original backlight control signal in the display time T1 of one frame is substantially equal to the power consumption of the n backlight regions 120 corresponding to the first corrected backlight control signal in the display time T2 of one frame.
Referring to fig. 7, fig. 7 is a schematic diagram of driving waveforms of the liquid crystal display device 10 shown in fig. 1 in the second display mode. As shown in fig. 7(a) and (c), when the liquid crystal display mode 10 enters the second display mode, the control signal processing unit 131 sends the second mode control signal to the display signal adjusting unit 132 and the backlight signal adjusting unit 133. The display signal adjusting unit 132 generates and outputs a second timing control signal to the scan driving unit 134 and the data driving unit 135 according to the original timing control signal. The control backlight signal adjusting unit 133 generates a second correction backlight control signal according to the original backlight control signal.
In the second display mode, the display time of one frame is divided into a scan period t1 and a sustain period t2, the scan driving unit 134 generates and outputs scan signals according to the second timing control signal in the scan period t1 to sequentially scan the n display regions 110, the data driving unit 135 converts the original data signals into gray scale voltage signals and controls to sequentially apply the gray scale voltage signals to the n display regions in the scan period t1 according to the second timing control signal, the transistor 114 is turned on, and the gray scale voltage signals are written into the liquid crystal capacitor 115.
After the scan lines 111 are applied with the scan signal once in the scan period t1, the liquid crystal display device 10 enters the sustain period t2 from the scan period t1, and the second correction backlight control signal controls the n backlight areas 120 of the backlight module 12 to be turned off in the scan period t1 and to be turned on in the sustain period t 2.
As before, the original timing control signal includes at least one of an original horizontal synchronization signal, an original vertical synchronization signal V-sync, an original pixel clock signal, and an original enable signal, and the second correction timing control signal includes at least one of a second horizontal synchronization correction signal, a second vertical synchronization correction signal V-sync2, a second pixel clock correction signal, and a second correction enable signal. The original timing control signals, including the original vertical synchronization signal V-sync and the first vertical synchronization correction signal V-sync2, are illustrated in FIGS. 7(a) and (c).
In this embodiment, the second horizontal synchronization correction signal may be obtained by correcting the original horizontal synchronization signal, and a width (gate on time) of the scanning signal applied to each scanning line 111 corresponding to the original horizontal synchronization signal is greater than a width of the scanning signal applied to each scanning line 111 and a width of the gray scale voltage signal applied to each data line 112 corresponding to the second correction horizontal synchronization signal, so that an on time of each transistor 114 and a time for writing the gray scale voltage signal into the liquid crystal capacitor are reduced.
The second vertical synchronization correction signal is obtained by correcting the relative vertical horizontal synchronization signal, and the display time of a frame corresponding to the original vertical synchronization signal V-sync is longer than that of a frame corresponding to the second correction vertical synchronization signal V-sync2, so that the start time and the end time of each frame are changed, and the original vertical synchronization signal needs to be corrected into the second vertical synchronization correction signal. Based on the variation of the horizontal synchronization signal and the vertical synchronization signal, the pixel clock signal and the enable signal are also adjusted accordingly, so that the second pixel clock calibration signal can be generated according to the original pixel clock signal and the second calibration enable signal can be generated according to the original enable signal according to actual needs.
The original backlight control signal may include an original pulse width signal (PWM), the second corrected backlight control signal includes a second pulse width correction signal (New PWM 2), and the second pulse width correction signal New PWM 2 may also be obtained by correcting the original pulse width signal PWM, wherein the current applied to the light source of the backlight module 12 may be adjusted by adjusting the frequency and duty ratio of the second pulse width correction signal, so as to control the brightness and the switching of each backlight area 120 of the backlight module.
As shown in fig. 7(c) and (d), the light emission intensities of the n backlight areas 120 corresponding to the original backlight control signal are all the first intensity at the display time of one frame, the light emission intensities of the n backlight areas 120 corresponding to the backlight module 12 corresponding to the second correction backlight control signal are the third intensity at the maintaining time, the third intensity is greater than the first intensity, and the light emission amounts of the n backlight areas 120 corresponding to the original backlight control signal at the display time T1 of one frame are equal to the light emission amounts of the n backlight areas corresponding to the second correction backlight control signal at the display time T3 of one frame.
Since the light sources of the backlight module 12 are driven by current, the light emitting intensities of the n backlight areas 120 are the same as the driving current intensities of the light sources of the n backlight areas 120, so the driving current intensities (BLU) of the n backlight areas 120 corresponding to the original backlight control signal are all the first current intensities during the display time of one frame of picture, and in the second display mode, the driving current intensities (New BLU 2) of the n backlight areas 120 corresponding to the second correction backlight control signal are the third current intensities during the maintaining time period t2, and the third current intensities are greater than the first current intensities. In order to ensure accurate restoration of the display data and brightness, the power consumption of the n backlight regions corresponding to the original backlight control signal at the display time T1 of one frame of picture is substantially equal to the power consumption of the n backlight regions 120 corresponding to the second correction backlight control signal at the display time T3 of one frame of picture.
Referring to fig. 8, fig. 8 is a flowchart of a driving method of the liquid crystal display device 10 shown in fig. 1. The driving method may include the following steps S1, S2, and S3.
In step S1, the 1 st to i-1 st backlight regions, the i +1 st to nth backlight regions are controlled to be turned on for light emission and the ith backlight region is controlled to be turned off.
In step S1, the 1 st to i-1 st backlight regions 110, the i +1 th to n-th backlight regions 110 may be controlled to be turned on to emit light and the i-th backlight region 110 may be controlled to be turned off by outputting the first corrected backlight control signal through the backlight signal adjusting unit 133.
Specifically, the n backlight regions 120 of the backlight module 12 emit light under the control of the first calibration backlight control signal, wherein the 1 st to i-1 st backlight regions, the i +1 st to n-th backlight regions are turned on and the i-th backlight regions are turned off. In step S2, a scan signal is supplied to the ith display region.
Step S2 may be performed by the scan driving unit 134.
Specifically, the scan driving unit 134 may generate and sequentially output scan signals to the scan lines 111 according to the first calibration timing control signal to scan the n display regions 110.
In step S3, a corresponding gray scale voltage signal is applied to the ith display region.
Step S3 may be performed by the data driving unit 135. The data driving unit 135 converts the original data signal into a gray scale voltage signal and controls the gray scale voltage signal to be sequentially applied to the data lines 112 of the ith display region 110 according to the first calibration timing control signal, the transistor 114 is turned on, and the gray scale voltage signal is written into the liquid crystal capacitor 115.
The driving method may further include step S4, outputting a first display mode control signal or a second display mode control signal, when the liquid crystal display device 10 enters the first display mode, the control signal processing unit 131 further sends the first mode control signal to the display signal adjusting unit 132 and the backlight signal adjusting unit 133, the display signal adjusting unit 132 generates and outputs a first calibration timing control signal to the scan driving unit 134 and the data driving unit 135 according to the original timing control signal, and the backlight signal adjusting unit 133 generates a first calibration backlight control signal according to the original backlight control signal. When the first display mode control signal is output, the liquid crystal display device performs the above steps S1, S2, and S3; when the second display mode control signal is output and one frame of the display time is divided into the scan period t1 and the sustain period t2, the liquid crystal display device performs the following steps S5 and S6.
In step S5, in the scanning period t1, the scanning signal is output to sequentially scan the n display regions 110, the grayscale voltage signal is sequentially applied to the n display regions 110, and the n backlight regions 120 are controlled to be turned off. Specifically, the scan driving unit 134 outputs scan signals to sequentially scan the n display regions 110, the data driving unit 135 sequentially applies gray scale voltage signals to the n display regions 110, and the backlight signal adjusting unit 133 controls the n backlight regions 120 to be turned off.
In step S6, the n backlight regions 120 are controlled to be turned on simultaneously during the sustain period t 2. Specifically, the backlight signal adjusting unit 133 controls the n backlight areas 120 to be turned off.
In step S6, the sustain period t2, the scan driving unit 134 and the data driving unit 135 may not apply the scan signal and the grayscale voltage signal to the liquid crystal display panel 110, so as to keep the transistor 114 turned off, and in addition, the turning off of the n backlight regions 120 may also be controlled by the backlight adjustment control unit 133.
In one embodiment, as shown in fig. 9, the control circuit 13 may further include a timing control unit 136, which may be electrically connected to the display signal adjusting unit 132, the backlight signal adjusting unit 133, the scan driving unit 134, and the data driving unit 135, and may receive and decompress the original image data and generate an original timing control signal, an original backlight control signal, an original data signal, and the like to provide corresponding signals to the display signal adjusting unit 132, the backlight signal adjusting unit 133, the scan driving unit 134, the data driving unit 135, and the like.
In an alternative embodiment, the liquid crystal display device 10 may only have the first display mode, that is, the liquid crystal display mode completely suitable for the virtual reality mode or other high-frequency display modes, in this case, the liquid crystal display device 10 may not be provided with the control signal processing unit, and does not need to perform mode switching, but only needs the display signal adjusting unit 132, the backlight signal adjusting unit 133, the scanning driving unit 134, and the data driving unit 135 to directly perform the related driving control of the second display mode in cooperation with each other; correspondingly, the driving method mainly includes steps S1, S2 and S3, that is, steps S4, S5 and S6 may not be included.
In the liquid crystal display device 10 and the driving method thereof according to the present invention, by partitioning the liquid crystal display panel 11 and the backlight module 12, in the scanning time period of the ith display area 110, the corresponding gray scale voltage signal is applied to the ith display area 110, the ith backlight area 120 corresponding to the ith display area 110 is turned off, and the backlight areas 120 other than the ith backlight area 120 are all turned on, so that the response time window of the liquid crystal during rotation can be reduced, and the dynamic afterimage phenomenon can be further improved.
The liquid crystal display device 10 includes two display modes, in the first display mode, the dynamic image sticking phenomenon can be improved by the partition control of the display region 110 and the backlight region 120, in the second display mode, the display time T of one frame is divided into the scanning time period T1 and the maintaining time period T2, the n backlight regions 120 of the backlight module 12 are all closed in the scanning time period T1, and the n backlight regions 120 of the backlight module 12 are all opened in the maintaining time period T2, so that the reaction time window of the liquid crystal during rotation can be reduced, and the dynamic image sticking phenomenon can be improved. In addition, the design of the two display modes can also allow the user to switch according to the requirement, so that the dynamic afterimage phenomenon is improved by performing partition control on the liquid crystal display panel 11 and the backlight module 12 in the virtual reality display mode in which the dynamic afterimage phenomenon is easily generated, and the liquid crystal display device 10 has a better display effect in the virtual reality display mode.
The first and second correction backlight control signals can adjust the light emission intensity and the switching time of the n backlight areas 120 of the backlight module 12, so that the light emission amounts of the n backlight areas 120 corresponding to the original backlight control signal at the display time T1 of one frame are equal to the light emission amounts of the n backlight areas corresponding to the first or second correction backlight control signals at the display time T2 or T3 of one frame, and further the backlight module 12 is ensured to provide the accurate light amount to the liquid crystal display panel 11, so that the liquid crystal display panel 11 can accurately restore the frame corresponding to the original image data, the liquid crystal display device 10 has a better display effect, and the second display mode can save power compared with the first display mode, and the technical effect of saving power in the second display mode can be achieved by the mode switching design.
Of course, the present invention is not limited to the above-disclosed embodiments, and various modifications may be made to the above-described embodiments. It will be appreciated by those skilled in the art that changes and modifications to the above embodiments may be made without departing from the true spirit of the invention, and the scope of the invention is to be defined by the appended claims.
Claims (7)
1. A liquid crystal display device, characterized in that: the liquid crystal display device comprises a liquid crystal display panel, a backlight module and a control circuit;
the liquid crystal display panel comprises n display areas, the backlight module comprises n backlight areas, the n backlight areas correspond to the n display areas one by one, n is a natural number which is more than or equal to 2, and each backlight area is used for providing backlight for the corresponding display area;
the control circuit is electrically connected with the liquid crystal display panel and the backlight module and is used for sequentially scanning the n display areas, applying corresponding gray scale voltage signals to the n display areas and controlling the n backlight areas to emit light;
in the time period that the ith display area is scanned, applying a corresponding gray scale voltage signal to the ith display area, closing the ith backlight area corresponding to the ith display area, opening the backlight areas except the ith backlight area, wherein i is a natural number which is more than or equal to 1 and less than or equal to n;
wherein the control circuit comprises a display signal adjusting unit, a backlight signal adjusting unit, a scanning driving unit and a data driving unit,
the display signal adjusting unit is used for generating and outputting a first correction time sequence control signal to the scanning driving unit and the data driving unit according to an original time sequence control signal,
the scanning driving unit is used for generating and sequentially outputting scanning signals according to the first correction time sequence control signal so as to scan the n display areas,
the data driving unit is used for converting an original data signal into the gray scale voltage signals and controlling the gray scale voltage signals to be sequentially applied to the n display areas according to the first correction time sequence control signal,
the backlight signal adjusting unit is used for generating a first correction backlight control signal according to an original backlight control signal, and the first correction backlight control signal is used for controlling the light emission of n backlight areas of the backlight module.
2. The liquid crystal display device according to claim 1, wherein: the original timing control signal comprises at least one of an original horizontal synchronization signal, an original vertical synchronization signal, an original pixel clock signal and an original enable signal, and the first correction timing control signal comprises at least one of a first horizontal synchronization correction signal, a first vertical synchronization correction signal, a first pixel clock correction signal and a first correction enable signal; the original backlight control signal comprises a pulse width signal and the first corrected backlight control signal comprises a first pulse width correction signal.
3. The liquid crystal display device according to claim 1, wherein: setting the light emission intensities of the n backlight areas corresponding to the original backlight control signal to be first intensities in the display time of one frame, setting the light emission intensity of the ith backlight area corresponding to the first correction backlight control signal in the period when the ith display area is scanned to be a second intensity, wherein the second intensity is greater than the first intensity, and the light emission amounts of the n backlight areas corresponding to the original backlight control signal in the display time of one frame are equal to the light emission amounts of the n backlight areas corresponding to the first correction backlight control signal in the display time of one frame.
4. The liquid crystal display device according to claim 1, wherein: the control circuit further comprises a control signal processing unit, the liquid crystal display device comprises a first display mode and a second display mode, the control signal processing unit controls the liquid crystal display device to enter the first display mode or the second display mode,
in the first display mode, the control signal processing unit controls the display signal adjusting unit to generate and output a first correction timing control signal to the scan driving unit and the data driving unit according to an original timing control signal and controls the backlight signal adjusting unit to generate the first correction backlight control signal according to the original backlight control signal,
the scanning driving unit generates and sequentially outputs the scanning signals according to the first correction time sequence control signal so as to scan the n display areas, the data driving unit converts the original data signals into the gray scale voltage signals and controls to sequentially apply the gray scale voltage signals to the n display areas according to the first correction time sequence control signal, and the n backlight areas of the backlight module emit light under the control of the first correction backlight control signal, wherein in the scanning time period of the ith display area, the corresponding gray scale voltage signals are applied to the ith display area, the ith backlight area corresponding to the ith display area is closed, and the backlight areas except the ith backlight area are all opened;
in the second display mode, the control signal processing unit controls the display signal adjusting unit to generate and output a second correction timing control signal to the scan driving unit and the data driving unit according to an original timing control signal and controls the backlight signal adjusting unit to generate a second correction backlight control signal according to an original backlight control signal, a frame display time is divided into a scan period and a sustain period, the scan driving unit generates and outputs the scan signal to a plurality of scan lines to sequentially scan the n display regions according to the second correction timing control signal in the scan period, the data driving unit converts the original data signal into the grayscale voltage signal and controls to sequentially apply the grayscale voltage signal to the n display regions according to the second correction timing control signal in the scan period, after the scanning signals are applied to the plurality of scanning lines once in the scanning period, the liquid crystal display device enters a maintaining period from the scanning period, and the second correction backlight control signal controls n backlight areas of the backlight module to be turned off in the scanning period and to be turned on in the maintaining period.
5. The liquid crystal display device according to claim 4, wherein: the first display mode is a virtual reality display mode, and the second display mode is a common display mode.
6. The liquid crystal display device according to claim 4, wherein: the control signal processing unit is used for generating a first mode control signal and a second mode control signal based on the selection of a user or the satisfaction of a preset detection condition, and sending the first mode control signal or the second mode control signal to the display signal adjusting unit and the backlight signal adjusting unit so as to control the display signal adjusting unit and the backlight signal adjusting unit.
7. The liquid crystal display device according to claim 4, wherein: assuming that the light emission intensities of the n backlight regions corresponding to the original backlight control signal are all the first intensity at the display time of one frame, the light emission intensities of the n backlight regions of the backlight module corresponding to the second correction backlight control signal at the sustain period are the third intensity, the third intensity is greater than the first intensity, and the light emission amounts of the n backlight regions corresponding to the original backlight control signal at the display time of one frame are equal to the light emission amounts of the n backlight regions corresponding to the second correction backlight control signal at the display time of one frame.
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| CN110246466B (en) * | 2019-07-12 | 2021-01-29 | 业成科技（成都）有限公司 | Light source control method of display device and liquid crystal display device |
| TWI783567B (en) * | 2020-07-29 | 2022-11-11 | 義隆電子股份有限公司 | Drive device and control method for a display |
| CN112233623A (en) | 2020-10-13 | 2021-01-15 | Tcl华星光电技术有限公司 | Display device and control method thereof |
| CN114627823A (en) * | 2020-12-11 | 2022-06-14 | 纬联电子科技(中山)有限公司 | Liquid crystal display and picture display method |
| CN112687241B (en) * | 2020-12-30 | 2022-08-12 | 青岛信芯微电子科技股份有限公司 | Liquid crystal display screen, display method and method for determining driving signal |
| CN113808548A (en) * | 2021-09-29 | 2021-12-17 | 武汉华星光电技术有限公司 | Display device and driving method thereof |
| CN114429756B (en) * | 2021-12-31 | 2024-02-23 | 上海矽力杰微电子技术有限公司 | Backlight scanning method, backlight driver and display device |
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