TW202016913A - Liquid crystal display device and driving methed thereof - Google Patents

Abstract

A liquid crystal display device includes a liquid crystal display panel, a backlight module, and a control circuit. The liquid crystal display panel includes n display regions. The backlight module includes n emitting regions. The control circuit is electrically connected to the liquid crystal display panel and the backlight module. The control circuit is used to scan to the n display regions, provide gray voltage signals to the n display region, and control the n emitting regions emit. In the scanning time of the ith display region, the ith display region is provided to the corresponding gray voltage signals, the ith emitting region corresponding to the ith display region is closed, and other emitting regions are emitting. n is a natural number and is greater than 2. i is a natural number. i is greater than or equal to 1 and is less than or equal to n.

Description

Liquid crystal display device and its driving method

The invention relates to a liquid crystal display device and a driving method thereof.

With the advancement of technology, flat panel display devices have been widely used in various fields, especially liquid crystal display devices. Due to their light weight, low power consumption and no radiation, they have gradually replaced traditional cathode ray tube display devices. It is applied to many types of electronic products, such as mobile phones, portable multimedia devices, notebook computers, LCD TVs and LCD screens. However, due to the retention characteristics of the liquid crystal, the liquid crystal display device is prone to generate motion blur phenomenon when displaying a dynamic picture.

A liquid crystal display device includes a liquid crystal display panel, a backlight module and a control circuit. The liquid crystal display panel includes n display areas, the backlight module includes n backlight areas corresponding to n display areas in one-to-one correspondence, and n is equal to or greater than 2. Natural number of each, each backlight area is used to provide backlight to a corresponding display area, the control circuit is electrically connected to the liquid crystal display panel and the backlight module, used to sequentially scan n display areas and apply the corresponding grayscale voltage signal to n The display area and the light emission of the n backlight areas are controlled. During the period when the i-th display area is scanned, the corresponding gray-scale voltage signal is applied to the i-th display area, and the i-th backlight area corresponding to the i-th display area is turned off , And the backlight areas other than the ith backlight area are all turned on, i is a natural number greater than or equal to 1 and less than or equal to n.

In one embodiment, n is a natural number greater than or equal to 3.

In one embodiment, the control circuit includes a display signal adjustment unit, a backlight signal adjustment unit, a scan drive unit, and a data drive unit. The display signal adjustment unit is used to generate and output the first corrected timing control signal to the scan driver according to the original timing control signal Unit and data drive unit, the scan drive unit is used to generate and sequentially output scan signals according to the first correction timing control signal to scan n display areas, and the data drive unit is used to convert the original data signal into a gray-scale voltage signal according to the first The correction timing control signal control sequentially applies the gray-scale voltage signal to the n display areas. The backlight signal adjustment unit is used to generate a first corrected backlight control signal according to the original backlight control signal, and the first corrected backlight control signal is used to control the backlight module Of the n backlight areas glow.

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. The first correction timing control signal includes a first horizontal synchronization correction signal, At least one of the first vertical synchronization correction signal, the first pixel clock correction signal, and the first correction enable signal; the original backlight control signal includes a pulse width signal, and the first corrected backlight control signal includes a first pulse width correction signal.

In one embodiment, it is assumed that the luminous intensity of the n backlight regions corresponding to the original backlight control signal is the first intensity in the display time of a frame of the picture, and the i-th backlight region corresponding to the first corrected backlight control signal is at the i-th The luminous intensity of the time period during which the display area is scanned is the second intensity, the second intensity is greater than the first intensity, the amount of light emitted by the n backlight areas corresponding to the original backlight control signal in the display time of one frame of the frame and the first corrected backlight control signal The corresponding n backlight areas have the same amount of light in the display time of one frame.

In one embodiment, the control circuit further includes a control signal processing unit. The liquid crystal display device includes 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 a display mode, the control signal processing unit controls the display signal adjustment unit to generate and output the 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 adjustment unit to generate the first correction according to the original backlight control signal Backlight control signal, the scan drive unit generates and sequentially outputs scan signals according to the first correction timing control signal to scan n display areas, and the data drive unit converts the original data signal into a gray-scale voltage signal and controls the control according to the first correction timing control signal. The gray-scale voltage signal is applied to n display areas in sequence, and the n backlight areas of the backlight module emit light under the control of the first corrected backlight control signal, wherein, during the period when the i-th display area is scanned, the i-th display The corresponding gray-scale voltage signal is applied to the area, the i-th backlight area corresponding to the i-th display area is turned off, and the backlight areas other than the i-th backlight area are all turned on; in the second display mode, the control signal processing unit controls the display signal The adjustment unit generates and outputs the second corrected 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 adjustment unit to generate the second corrected backlight control signal according to the original backlight control signal, and the frame display time It is divided into a scanning period and a sustain period. The scanning driving unit generates and outputs a scanning signal according to the second correction timing control signal during the scanning period to sequentially scan n display areas. The data driving unit converts the original data signal into a gray-scale voltage signal and according to the Two calibration timing control signals control the gray-scale voltage signals to be sequentially applied to the n display areas during the scanning period. After a plurality of scanning lines are applied with a scanning signal once during the scanning period, the liquid crystal display device enters the sustain period from the scanning period. The correction backlight control signal controls the n backlight regions of the backlight module to be turned off during the scanning period and all turned on during the maintenance 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 used to generate a first mode control signal and a second mode control signal based on the user's selection or the satisfaction of the preset detection conditions, and send out the first mode control signal or the second mode control The signal-to-display signal adjustment unit and the backlight signal adjustment unit control the display signal adjustment unit and the backlight signal adjustment unit.

In one embodiment, it is assumed that the luminous intensity of the n backlight regions corresponding to the original backlight control signal is the first intensity in the display time of a frame of the picture, and the n backlight regions of the backlight module corresponding to the second corrected backlight control signal are at The luminous intensity in the sustaining period is the third intensity, the third intensity is greater than the first intensity, the amount of light emitted by the n backlight regions corresponding to the original backlight control signal in the display time of one frame of the frame and the n backlights corresponding to the second corrected backlight control signal The area has the same amount of light during the display time of one frame.

A driving method of a liquid crystal display device. The liquid crystal display device includes a liquid crystal display panel having n display areas and a backlight module having a backlight area corresponding to the n display areas in one-to-one correspondence. i display areas provide backlight, where n is a natural number greater than or equal to 2, i is a natural number greater than or equal to 1 and less than or equal to n, and the driving method includes the following steps:

Control the 1st to i-1th backlight area, the i+1th to nth backlight area to turn on, and the ith backlight area to turn off; provide scan signals to the ith display area; and apply correspondence to the ith display area Gray scale voltage signal. In one embodiment, the driving method includes the following steps: outputting the first display mode control signal or the second display mode control signal, when outputting the first display mode control signal, controlling the 1st to i-1 backlight areas, the i+th 1 to the nth backlight area is turned on and the ith backlight area is turned off; the scan signal is provided to the ith display area; and the corresponding grayscale voltage signal is applied to the ith display area; when the second display mode control signal is output The display time of a frame is divided into a scanning period and a maintenance period. During the scanning period, the output scan signal sequentially scans n display areas, applies the gray-scale voltage signal to the n display areas in sequence, and controls the n backlight areas to turn off. During the sustain period, n backlight regions are controlled to be turned on at the same time.

Compared with the prior art, in the liquid crystal display device and the driving method thereof of the present invention, by partitioning the liquid crystal display panel and the backlight module, the i-th display area is correspondingly applied during the period when the i-th display area is scanned Gray-scale voltage signal, the i-th backlight area corresponding to the i-th display area is turned off, and the backlight areas other than the i-th backlight area are all turned on, which can reduce the reaction window of the liquid crystal during the rotation, and reduce the perception of the outside world. Opportunities to further improve the dynamic afterimage phenomenon.

Please refer to FIG. 1, which is a schematic block diagram of a liquid crystal display device 10 according to an embodiment of the present 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 to provide backlight to the liquid crystal display panel 11, and the liquid crystal display panel 11 is used to receive the backlight and display a picture. The control circuit 13 is electrically connected to the liquid crystal display panel 11 and the backlight module 12 for controlling the light emission of the backlight module 12 and the screen display of the liquid crystal display panel 11.

The control circuit 13 includes a control signal processing unit 131, a display signal adjustment unit 132, a backlight signal adjustment 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 adjustment unit 132 and the backlight signal adjustment unit 133. The display signal adjustment 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 adjustment unit 133 is electrically connected to the backlight module 12.

The liquid crystal display panel 11 includes n display areas 110, where n is a natural number greater than or equal to 2. The 1~n display areas 110 are arranged in sequence along the direction away from the data driving unit 135. In an embodiment, n is a natural number greater than or equal to 3, that is, the liquid crystal display panel 11 includes at least three display areas 110.

Please refer to FIG. 2, which 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 and spaced apart, a plurality of data lines 112 arranged in parallel and spaced perpendicular to the scan line 111, and located in the smallest rectangular area formed by the intersection of the scan line 111 and the data line 112 Pixel unit 113. A 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, the gate is connected to the corresponding scan line 111, the source is connected to the corresponding data line 112, and the drain Connect the liquid crystal capacitor 115.

In this embodiment, each display area 110 is a rectangular strip area extending in the direction of the scanning line 111, and 1 to n display areas 110 are sequentially arranged in the direction of the data line 112, and each display area 110 may correspond to The pixel unit 113 of one line, two lines or plural lines can be set according to actual needs.

Please refer to FIG. 3, which 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 n display regions 110 in one-to-one correspondence. Each backlight region 120 may be located directly under the corresponding one of the display regions 110 to provide backlight to the corresponding one of the display regions 110. , The brightness of each backlight area 120 and the on and off can also be controlled separately. The backlight module 12 may be a direct type backlight module or an edge type backlight module, which can be selected according to actual needs.

Please refer to FIG. 4. FIG. 4 is a schematic perspective view of an embodiment of the backlight module 12 shown in FIG. 3. In the embodiment, the backlight module 12 is a direct type backlight module, which includes a plurality of light sources 121 arranged in a plurality of arrays 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 to the above. The light source diaphragm 121 may be one, two, or plural, and may be a diffusion sheet, a light guide plate, etc., which can be selected according to actual needs. The light source 121 corresponding to each backlight area 120 and the light sources 121 corresponding to other backlight areas 120 can be electrically connected to each other independently, so that the light source 121 corresponding to each backlight area 120 can be individually controlled to emit light, turn on or off, thereby In this way, the brightness, turn-on and turn-off of each backlight area 120 can be individually controlled.

Please refer 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 an edge-type backlight module, which includes a light guide plate 122' and a plurality of light sources 121' arranged on a side of the light guide plate 122' in a straight line. The light source 121' may be a white LED, but is not limited to the above. The light guide plate 122' may be further provided with a diffusion sheet, a brightness enhancement sheet, etc., which will not be repeated here. In an embodiment, the light source 121 ′ corresponding to each backlight area 120 and the light source 121 ′ corresponding to other backlight areas 120 may be independent of each other, so that the light source 121 ′ corresponding to each backlight area 120 can be individually controlled to emit light, turn on or off, Thus, the light emission brightness, on, and off of each backlight area 120 can be individually controlled.

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 an ordinary display mode. The control signal processing unit 131 can generate the first mode control signal and the second mode control signal based on the user's selection or the satisfaction of the preset detection conditions, and send the first mode control signal or the second mode control signal to the display signal adjustment unit 132 and the backlight signal adjustment unit 133 to control the display signal adjustment unit 132 and the backlight signal adjustment unit 133. The user can select the first display mode or the second display mode by manipulating the display menu or buttons, so that the signal processing unit 131 generates and outputs the first mode control signal and the second mode control signal.

The preset detection condition may be that a change in the format of the image data received by the control circuit 13 is detected. For example, if the data format of the normal display data and the virtual display data is different, the first mode control signal can be generated by detecting the data format Or the second mode control signal. The preset detection condition may be that a preset gesture, action, or touch action is detected, so that the first mode control signal or the second mode control signal is generated according to different preset gestures, action, or touch action. However, the above is only an exemplary description, and the preset detection adjustment can also be set to other according to actual needs, and is not limited to the above.

Please refer to FIG. 6, which is a schematic diagram of driving waveforms of the liquid crystal display device 10 shown in FIG. 1 in the first display mode. 6 (a) and (c), when the liquid crystal display device 10 enters the first display mode, the control signal processing unit 131 sends the first mode control signal to the display signal adjustment unit 132 and the backlight signal adjustment unit 133, the display signal adjustment The unit 132 generates and outputs the first corrected 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 adjustment 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 line 111 according to the first calibration timing control signal to scan n display areas 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 correction timing control signal control, the transistor 114 is turned on, and the gray-scale voltage The 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 corrected backlight control signal.

In the first display mode, during the period when the scan line of the i-th display area 110 is scanned, the data line of the i-th display area 110 is applied with the corresponding gray-scale voltage signal, and the data line of the i-th display area 110 corresponds to the The i backlight regions 120 are turned off, and all the backlight regions 120 except the i-th backlight region 120 are turned on. 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. In FIG. 6 (a) and (c), the original timing control signal mainly includes the original vertical synchronization signal V-sync and the first vertical synchronization correction signal V-sync1.

The horizontal synchronization signal is used to control the timing of the scanning signal applied to the scanning line 111. In this embodiment, the first horizontal synchronization correction signal may be obtained by correcting the original horizontal synchronization signal. The width of the scanning signal applied to each scanning line 111 corresponding to the original horizontal synchronization signal (or high level duration, ie, gate on time) is greater than the scanning applied to each scanning line 111 corresponding to the first corrected horizontal synchronization signal The width of the signal and the width of the gray-scale voltage signal applied to each data line 112 reduce the turn-on time of each transistor 114 and the time for the gray-scale voltage signal to be written into the liquid crystal capacitor 114; correspondingly, the first vertical synchronization The correction signal V-sync1 is obtained by correcting the vertical horizontal synchronization signal V-sync. In one embodiment, the digital horizontal vertical synchronization signal V-sync can be modified by digital modulation to correct it to the first vertical synchronization correction signal V-sync1. Of course, in another embodiment, if the vertical horizontal synchronization signal V-sync is in an analog signal format, the vertical horizontal synchronization signal V-sync as shown in FIG. 6(a) can also be corrected to The first vertical horizontal synchronization signal V-sync1 shown in 6(b).

The display time T1 of the frame corresponding to the original vertical synchronization signal V-sync is greater than the display time T2 of the frame corresponding to the first corrected vertical synchronization signal V-sync1, so that the start time and end time of each frame of the frame vary. The original vertical synchronization signal V-sync needs to be corrected to the first vertical synchronization correction signal V-sync1. Based on the changes of the horizontal synchronization signal and the vertical synchronization signal, the pixel clock signal and the enable signal also need to be adjusted accordingly. Therefore, the first pixel clock correction signal can be generated according to the actual pixel clock signal according to the actual needs, and according to the original The enable signal generates the first correction enable signal.

As shown in FIGS. 6(b) and (d), the original backlight control signal may include an original pulse width signal (PWM), and the first corrected backlight control signal includes a first pulse width correction signal (New PWM 1), the first pulse width The correction signal New PWM 1 can also be obtained by calibrating the original pulse width signal PWM, wherein the current applied to the light source of the backlight module can be adjusted by adjusting the frequency and duty cycle of the first pulse width correction signal New PWM 1 to control The brightness and switch of each backlight area 120 of the backlight module 12.

It is assumed that the luminous intensity of the n backlight regions 120 corresponding to the original backlight control signal is the first intensity at the display time T1 of a frame of picture. In the first display mode, the ith backlight region corresponding to the first corrected backlight control signal is at The luminous intensity of the time period Ts at which the i-th display area 110 is scanned is the second intensity, where the second intensity is greater than the first intensity, but to ensure accurate display data and brightness restoration, the n backlights corresponding to the original backlight control signal The amount of light emitted by the area 120 in the display time T1 of one frame is substantially equal to the amount of light emitted by the n backlight areas 120 corresponding to the first corrected backlight control signal in the display time T2 of one frame.

Since the light sources of the backlight module 12 are current driven, the luminous intensity of the n backlight regions 120 is the same as the driving current intensity of the light sources of the n backlight regions 120. Therefore, the driving current of the n backlight regions 120 corresponding to the original backlight control signal is set Intensity (BLU) The display time of a frame is the first current intensity. In the first display mode, the i-th backlight area 120 corresponding to the first corrected backlight control signal is scanned in the i-th display area 110 The driving current intensity (New BLU 1) of the segment is the second current intensity, and the second current intensity is greater than the first current intensity. In order to ensure accurate restoration of display data and brightness, the power consumption of the n backlight areas 120 corresponding to the original backlight control signal in the display time T1 of one frame and the n backlight areas 120 corresponding to the first corrected backlight control signal in one frame The power consumption of the display time of T2 is basically equal.

Please refer to FIG. 7. FIG. 7 is a driving waveform diagram of the liquid crystal display device 10 shown in FIG. 1 in the second display mode. As shown in FIGS. 7(a) and (c), when the liquid crystal display mode 10 enters the second display mode, the control signal processing unit 131 sends a second mode control signal to the display signal adjustment unit 132 and the backlight signal adjustment unit 133. The display signal adjusting unit 132 generates and outputs the second correction 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 adjustment unit 133 generates a second corrected 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. During the scan period t1, the scan driving unit 134 generates and outputs a scan signal according to the second correction timing control signal to sequentially scan the n display regions 110. 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 n display regions in the scanning period t1 according to the second correction timing control signal, the transistor 114 is turned on, and the gray-scale voltage signal Write to the liquid crystal capacitor 115.

After a plurality of scan lines 111 are applied with a scan signal once during the scan period t1, the liquid crystal display device 10 enters the sustain period t2 from the scan period t1, and the second corrected backlight control signal controls the n backlight regions 120 of the backlight module 12 during the scan period t1 is off and both are on during the sustain period t2.

As before, the original timing control signal includes at least one of the original horizontal synchronization signal, the original vertical synchronization signal V-sync, the original pixel clock signal, and the original enable signal. The second correction timing control signal includes the second horizontal synchronization correction signal, At least one of the second vertical synchronization correction signal V-sync2, the second pixel clock correction signal, and the second correction enable signal. In FIG. 7 (a) and (c), the original timing control signal mainly includes the original vertical synchronization signal V-sync and the first vertical synchronization correction signal V-sync2.

In this embodiment, the second level synchronization correction signal may be obtained by correcting the original level synchronization signal. The width (gate on time) of the scanning signal applied to each scanning line 111 corresponding to the original level synchronization signal is greater than the second correction level 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 synchronization signal, so that the turn-on time of each transistor 114 and the gray-scale voltage signal are written into the liquid crystal The capacitance time is reduced.

The second vertical synchronization correction signal is corrected with respect to the vertical horizontal synchronization signal. The display time of one frame corresponding to the original vertical synchronization signal V-sync is longer than the display time of one frame corresponding to the second corrected vertical synchronization signal V-sync2. Therefore, the start time and end time of each frame of the picture change, and the original vertical synchronization signal needs to be corrected to the second vertical synchronization correction signal. Based on the changes of the horizontal synchronization signal and the vertical synchronization signal, the pixel clock signal and the enable signal also need to be adjusted accordingly. Therefore, the second pixel clock correction signal can be generated based on the original pixel clock signal according to actual needs, and based on the original The enable signal generates a second correction enable signal.

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 a PWM for the original pulse width signal The correction is obtained, wherein the current applied to the light source of the backlight module 12 can be adjusted by adjusting the frequency and the duty ratio of the second pulse width correction signal, thereby controlling the brightness and switching of each backlight area 120 of the backlight module.

As shown in FIGS. 7(c) and (d), the luminous intensity of the n backlight regions 120 corresponding to the original backlight control signal is the first intensity in the display time of one frame of the picture, and the backlight mode corresponding to the second corrected backlight control signal The luminous intensity of the n backlight regions 120 of the group 12 during the sustain period is the third intensity, and the third intensity is greater than the first intensity. The luminous intensity of the n backlight regions 120 corresponding to the original backlight control signal in the display time T1 of a frame The n backlight regions corresponding to the second corrected backlight control signal have the same amount of light emitted during the display time T3 of a frame.

Since the light sources of the backlight module 12 are driven by current, the luminous intensity of the n backlight regions 120 is consistent with the driving current intensity of the light sources of the n backlight regions 120. Therefore, the driving current intensity of the n backlight regions 120 corresponding to the original backlight control signal (BLU) The display time of a frame is the first current intensity. In the second display mode, the driving current intensity of the n backlight regions 120 corresponding to the second corrected backlight control signal during the sustain period t2 (New BLU 2) It is the third current intensity, and the third current intensity is greater than the first current intensity. To ensure accurate restoration of display data and brightness, the power consumption of the n backlight areas corresponding to the original backlight control signal in the display time T1 of one frame and the n backlight areas 120 corresponding to the second corrected backlight control signal in the one frame The power consumption at the display time T3 is basically equal.

Please refer to FIG. 8, which is a flowchart of the 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 1st to i-1th backlight regions, the i+1th to nth backlight regions are controlled to turn on, and the ith backlight region is turned off.

In step S1, the backlight signal adjustment unit 133 may output a first corrected backlight control signal to control the 1st to i-1th backlight regions 110, the i+1th to nth backlight regions 110 to turn on, and the ith backlight region 110 shut down.

Specifically, the n backlight regions 120 of the backlight module 12 emit light under the control of the first corrected backlight control signal, wherein the 1st to i-1th backlight regions and the i+1th to nth backlight regions turn on and emit light and The ith backlight area is off. Step S2, providing a scan signal to the i-th display area.

Step S2 may be executed by the scan driving unit 134.

Specifically, the scan driving unit 134 can generate and sequentially output the scan signal to the scan line 111 according to the first correction timing control signal to scan the n display areas 110.

In step S3, a corresponding gray-scale voltage signal is applied to the i-th display area.

Step S3 may be executed by the material driving unit 135. 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 line 112 of the i-th display area 110 according to the first correction timing control signal control, the transistor 114 is turned on, and the gray scale The voltage signal is written into the liquid crystal capacitor 115.

The driving method may further include step S4, outputting the first display mode control signal or the second display mode control signal. When the liquid crystal display device 10 enters the first display mode, the control signal processing unit 131 also sends out the first mode control signal to the display signal adjustment The unit 132 and the backlight signal adjustment unit 133, the display signal adjustment unit 132 generates and outputs the first corrected 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 adjustment unit 133 generates according to the original backlight control signal The first calibration 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, the frame display time of one frame is divided into a scanning period t1 and a sustain period t2, the liquid crystal display device performs the following Steps S5, S6.

In step S5, during the scanning period t1, the output scan signal sequentially scans the n display areas 110, sequentially applies the gray-scale voltage signal to the n display areas 110, and controls the n backlight areas 120 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 the gray-scale voltage signals to the n display regions 110, and the backlight signal adjustment unit 133 controls the n backlight regions 120 to turn off .

In step S6, during the sustain period t2, n backlight regions 120 are controlled to be turned on at the same time. Specifically, the backlight signal adjustment unit 133 controls the n backlight regions 120 to be turned off.

In step S6, during the sustaining period t2, the scan driving unit 134 and the data driving unit 135 may not apply the scan signal and the gray-scale voltage signal to the liquid crystal display panel 110, thereby keeping the transistor 114 turned off. In addition, the n backlight regions 120 may be turned off. Controlled by the backlight adjustment control unit 133.

In an 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 adjustment unit 132, the backlight signal adjustment unit 133, the scan driving unit 134, and the data driving unit 135 , The timing control unit can receive the original image data and decompress the original image data, and generate the original timing control signal, the original backlight control signal, and the original data signal, etc., to provide the corresponding signal to the display signal adjustment unit 132, The backlight signal adjusting unit 133, the scanning driving unit 134, the data driving unit 135, etc.

In a modified embodiment, the liquid crystal display device 10 may only have the first display mode, that is, a liquid crystal display mode that is fully suitable for virtual reality mode or other high-frequency display modes. In this case, the liquid crystal display device 10 may not be provided The control signal processing unit does not need to switch modes, only the display signal adjustment unit 132, the backlight signal adjustment unit 133, the scan drive unit 134, and the data drive unit 135 cooperate to directly perform the related drive control of the second display mode; the corresponding 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 its driving method of the present invention, the liquid crystal display panel 11 and the backlight module 12 are partitioned so that during the period when the i-th display area 110 is scanned, a corresponding Gray-scale voltage signal, the i-th backlight area 120 corresponding to the i-th display area 110 is turned off, and the backlight areas 120 other than the i-th backlight area 120 are turned on, which can reduce the reaction time of the liquid crystal during the rotation of the empty window, thereby improving the dynamics Afterimage phenomenon.

The liquid crystal display device 10 includes two display modes. In the first display mode, it is possible to improve the dynamic afterimage phenomenon through the partition control of the display area 110 and the backlight area 120. In the second display mode, by displaying a frame of time T Divided into a scanning period t1 and a maintenance period t2, n backlight areas 120 of the backlight module 12 are all turned off during the scanning period t1, and n backlight areas 120 of the backlight module 12 are all turned on during the maintenance period t2, which can also reduce the liquid crystal Empty windows during the rotating reaction time, thereby improving the dynamic afterimage phenomenon. In addition, the design of the two display modes can also allow users to switch according to their own needs, so as to control the LCD panel 11 and the backlight module 12 in a virtual reality display mode that is prone to dynamic image sticking, The dynamic afterimage phenomenon is improved so that the liquid crystal display device 10 has a better display effect in the virtual reality display mode.

The first and second corrected backlight control signals can adjust the luminous intensity and the switching period of the n backlight regions 120 of the backlight module 12, so that the n backlight regions 120 corresponding to the original backlight control signal display time T1 of a frame The amount of light emitted is equal to the amount of light emitted by n backlight regions corresponding to the first or second corrected backlight control signals in the display time T2 or T3 of a frame, thereby ensuring that the backlight module 12 provides an accurate amount of light to the liquid crystal display panel 11, thereby The liquid crystal display panel 11 can accurately restore the picture corresponding to the original image data, the liquid crystal display device 10 has a better display effect, and since the second display mode can save power compared to the first display mode, the mode switching design can also achieve The technical effect of power saving in the second display mode.

Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Anyone who has ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the attached patent application.

10: Liquid crystal display device 11: LCD panel 12: Backlight module 13: Control circuit 131: Control signal processing unit 132: Display signal adjustment unit 133: backlight signal adjustment unit 134: Scan drive unit 135: data drive unit 136: Timing control unit 110: display area 111: Scan line 112: data cable 113: Pixel unit 114: Transistor 115: LCD capacitor 120: Backlit area 121, 121’: Light source 122: Optical diaphragm 122’: Light guide plate

FIG. 1 is a block diagram of a liquid crystal display device according to a preferred embodiment of the present invention.

2 is a schematic diagram of an equivalent circuit of a liquid crystal display panel of the liquid crystal display device shown in FIG.

3 is a schematic plan view of the backlight module of the liquid crystal display 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.

6 is a schematic diagram of driving waveforms of the liquid crystal display device shown in FIG. 1 in a first display mode.

7 is a schematic diagram of driving waveforms of the liquid crystal display device shown in FIG. 1 in a second display mode.

8 is a flowchart of a driving method of a liquid crystal display device according to a preferred embodiment of the present invention.

FIG. 9 is a partial structural diagram of a control circuit of an embodiment of the liquid crystal display device shown in FIG. 1.

10: Liquid crystal display device

11: LCD panel

12: Backlight module

13: Control circuit

131: Control signal processing unit

132: Display signal adjustment unit

133: backlight signal adjustment unit

134: Scan drive unit

135: data drive unit

110: display area

Claims (10)

A liquid crystal display device includes: a liquid crystal display panel, the liquid crystal display panel includes n display areas; a backlight module, the backlight module includes n backlight areas that correspond to the n display areas in one-to-one correspondence, n For a natural number greater than or equal to 2, each backlight area is used to provide backlight to a corresponding display area; a control circuit that is electrically connected to the liquid crystal display panel and the backlight module for sequentially scanning the n number Display area and apply corresponding gray-scale voltage signals to the n display areas and control the light emission of the n backlight areas; during the period when the i-th display area is scanned, the i-th display area is applied correspondingly Gray scale voltage signal, the i-th backlight area corresponding to the i-th display area is turned off, and the backlight areas other than the i-th backlight area are all turned on, i is a natural number greater than or equal to 1 and less than or equal to n. The liquid crystal display device according to item 1 of the patent application scope, wherein the control circuit includes a display signal adjustment unit, a backlight signal adjustment unit, a scan drive unit, and a data drive unit, and the display signal adjustment unit is used to determine the original timing The control signal generates and outputs a first correction timing control signal to the scan driving unit and the data driving unit, the scan driving unit is used to generate and sequentially output a scan signal according to the first correction timing control signal to scan the n display areas, the data driving unit is used to convert the original data signal into the grayscale voltage signal and sequentially apply the grayscale voltage signal to the n number according to the first correction timing control signal control In the display area, the backlight signal adjustment unit is used to generate a first corrected backlight control signal according to the original backlight control signal, and the first corrected backlight control signal is used to control the light emission of n backlight areas of the backlight module. The liquid crystal display device as described in item 2 of the patent application range, wherein 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. 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 includes a pulse width signal The first correction backlight control signal includes a first pulse width correction signal. The liquid crystal display device as described in item 2 of the patent application range, wherein the luminous intensity of the n backlight regions corresponding to the original backlight control signal is the first intensity in the display time of one frame of the screen, the first The luminous intensity of the i-th backlight area corresponding to a corrected backlight control signal during the period when the i-th display area is scanned is the second intensity, the second intensity is greater than the first intensity, and the original backlight control signal corresponds to The amount of light emitted by the n backlight regions during the display time of one frame is equal to the amount of light emitted by the n backlight regions corresponding to the first corrected backlight control signal during the display time of one frame. The liquid crystal display device according to item 2 of the patent application scope, wherein the control circuit further includes a control signal processing unit, the liquid crystal display device includes a first display mode and a second display mode, and the control signal processing unit controls The liquid crystal display device enters the first display mode or the second display mode. In the first display mode, the control signal processing unit controls the display signal adjustment unit to generate and output the first signal according to the original timing control signal A corrected timing control signal to the scan drive unit and the data drive unit and to control the backlight signal adjustment unit to generate the first corrected backlight control signal according to the original backlight control signal, the scan drive unit according to the first A calibration timing control signal is generated and the scanning signal is sequentially output to scan the n display areas. The data driving unit converts the original data signal into the gray-scale voltage signal and controls the signal according to the first calibration timing Control to sequentially apply the gray-scale voltage signal to the n display areas, and the n backlight areas of the backlight module emit light under the control of the first corrected backlight control signal, wherein, in the i-th display area During the scanned period, the corresponding gray-scale voltage signal is applied to the i-th display area, the i-th backlight area corresponding to the i-th display area is turned off, and the backlight area other than the i-th backlight area Both are on; in the second display mode, the control signal processing unit controls the display signal adjustment unit to generate and output a second corrected timing control signal to the scan driving unit and the data driving unit according to the original timing control signal And controlling the backlight signal adjustment unit for generating a second corrected backlight control signal according to the original backlight control signal, a frame display time is divided into a scanning period and a maintenance period, the scanning driving unit according to the first Two calibration timing control signals generate and output the scanning signal to sequentially scan the n display areas, and the data driving unit converts the original data signal into the gray-scale voltage signal and controls according to the second calibration timing The signal control sequentially applies the gray-scale voltage signal to the n display regions during the scanning period. After the scanning signals are applied once during the scanning period, the liquid crystal display device The scanning period enters a maintenance period, and the second corrected backlight control signal controls n backlight regions of the backlight module to be turned off during the scanning period and all turned on during the maintenance period. The liquid crystal display device according to item 5 of the patent application scope, wherein the first display mode is a virtual reality display mode, and the second display mode is a normal display mode. The liquid crystal display device according to item 5 of the patent application scope, wherein the control signal processing unit is used to generate a first mode control signal and a second mode control signal based on the user's selection or the satisfaction of preset detection conditions, And send the first mode control signal or the second mode control signal to the display signal adjustment unit and the backlight signal adjustment unit to control the display signal adjustment unit and the backlight signal adjustment unit. The liquid crystal display device as described in item 5 of the patent application range, wherein the luminous intensity of the n backlight regions corresponding to the original backlight control signal is the first intensity in the display time of one frame of the screen, the first 2. The luminous intensity of the n backlight regions of the backlight module corresponding to the corrected backlight control signal during the sustain period is the third intensity, the third intensity is greater than the first intensity, and the original backlight control signal corresponds to the The amount of light emitted during the display time of one frame of the n backlight areas is equal to the amount of light emitted during the display time of the n backlight areas corresponding to the second corrected backlight control signal. A driving method of a liquid crystal display device, wherein the liquid crystal display device includes a liquid crystal display panel having n display areas and a backlight module having a backlight area corresponding to the n display areas one by one, and the i th backlight area is used for Provide backlight to the corresponding i-th display area, where n is a natural number greater than or equal to 2 and i is a natural number greater than or equal to 1 and less than or equal to n, the driving method includes the following steps: controlling the first to i-1 Backlight area, the i+1th to nth backlight areas are turned on and the ith backlight area is turned off; the scan signal is provided to the ith display area; and the corresponding grayscale voltage signal is applied to the ith display area. The driving method of a liquid crystal display device according to item 9 of the patent application scope, wherein the driving method includes the following steps: outputting a first display mode control signal or a second display mode control signal, when the first display mode is output Control signal to control the 1st to i-1th backlight area, the i+1th to nth backlight area to turn on and the ith backlight area to turn off; provide the scan signal to the ith display area; and to the ith display The corresponding grayscale voltage signal is applied to the area; when the second display mode control signal is output, the display time of one frame is divided into a scan period and a sustain period, and during the scan period, the output scan signal sequentially scans the n display areas , Sequentially applying gray-scale voltage signals to the n display regions, and controlling the n backlight regions to be turned off, and during the sustain period, controlling the n backlight regions to be turned on at the same time.

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