TWI680446B - 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 areas. The backlight module includes n backlight areas. Each backlight area is used to provide backlight to a corresponding display area. The circuit is electrically connected to the liquid crystal display panel and the backlight module, and is configured to scan n display areas and apply a gray-scale voltage signal to the n display areas and control the light emission of the n backlight areas. The time period during which the i display area is scanned, 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 areas other than the i-th backlight area are turned on, n is a natural number greater than or equal to 2, i A natural number greater than or equal to 1 and less than or equal to n.

Description

Liquid crystal display device and driving method thereof

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

With the advancement of science and technology, flat 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. And 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 liquid crystals, the liquid crystal display device is prone to produce a motion blur phenomenon when displaying a dynamic screen.

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 the n display areas, and n is 2 or more. Natural number, 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, and is used to sequentially scan n display areas and apply corresponding grayscale voltage signals to n The display area and the light emission of the n backlight areas are controlled. During the time 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 area other than the i-th backlight area is turned on, i is a natural number greater than or equal to 1 and less than or equal to n; the control circuit includes a display signal adjustment unit, a backlight signal adjustment unit, a scan drive unit, and a data drive unit, Said display signal tone The section unit is configured 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 the scan driving unit is configured to generate and sequentially generate the first correction timing control signal according to the first correction timing control signal. Outputting a scanning signal to scan the n display areas, the data driving unit is configured to convert the original data signal into the grayscale voltage signal and sequentially control the grayscale voltage according to the first correction timing control signal control A signal is applied to the n display areas, and the backlight signal adjustment unit is configured 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 n modules of the backlight module. Illumination of the backlight area.

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

In one embodiment, the original timing control signal includes at least one of an original level 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 level synchronization correction signal, At least one of 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, 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 one frame, and the i-th backlight region corresponding to the first corrected backlight control signal is the i-th. The luminous intensity of the time period when the display area is scanned is the second intensity, and the second intensity is greater than the first intensity. The n backlight regions corresponding to the original backlight control signal emit light in the display time of one frame and the first corrected backlight control signal. The corresponding n light-emitting areas have the same amount of light emission during 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. A display mode in which the control signal processing unit controls the display signal adjustment unit to generate and output a first correction timing control signal to the scan drive unit and the data drive unit according to the original timing control signal, and controls the backlight signal adjustment unit to control the original backlight control The signal generates a first corrected backlight control signal. The scan drive unit generates and sequentially outputs a scan signal to scan n display areas according to the first correction timing control signal. The data drive unit converts the original data signal into a grayscale voltage signal and performs the first correction. The timing control signal control sequentially applies gray-scale voltage signals to n display areas, and the n backlight areas of the backlight module emit light under the control of the first corrected backlight control signal, in which the time period during which the i-th display area is scanned 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 areas other than the i-th backlight area are turned on; in the second display mode, the control signal is The processing unit controls the display signal adjustment 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 adjustment unit to generate a second correction backlight control signal according to the original backlight control signal. One frame display time is divided into scan period and maintenance 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 grayscale voltage signal and controls the scanning in accordance with the second correction timing control signal. The gray-scale voltage signals are sequentially applied to n display areas during the period. After a plurality of scanning lines are applied with a scanning signal during the scanning period, the liquid crystal display device enters the maintenance period from the scanning period. The second correction backlight control signal controls the backlight module. The n backlight areas are turned off during the scanning period and turned on during the sustain 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's selection or the satisfaction of a preset detection condition, and issue a first mode control signal or a second mode control Signal to display signal adjustment unit and backlight signal adjustment unit to control the display signal adjustment unit and backlight signal adjustment unit.

In one embodiment, the luminous intensities of the n backlight regions corresponding to the original backlight control signal are set to be the first intensity in the display time of one frame, and the second corrected backlight control signal is corresponding to the The luminous intensity of the n backlight regions of the backlight module during the sustain period is a third intensity, and the third intensity is greater than the first intensity. The n backlight regions corresponding to the original backlight control signal emit light at a display time of one frame and the second intensity. The n backlight areas corresponding to the corrected backlight control signal emit light at the same display time in one frame.

A driving method for 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. The i-th backlight area is used for The i display areas provide backlight, 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: Control the 1st to i-1th backlight areas, the i + 1th to the nth backlight areas to turn on the light and the ith backlight area to be turned off; provide a scanning signal to the ith display area; and apply a response 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, and when outputting the first display mode control signal, controlling the first to i-1 backlight regions, the i + 1 to the nth backlight area is turned on and the ith backlight area is turned off; a scanning signal is provided to the ith display area; and a corresponding grayscale voltage signal is applied to the ith display area; when a second display mode control signal is output The display time of one frame is divided into a scanning period and a maintenance period. During the scanning period, the output scanning signal sequentially scans n display areas, applies the gray-scale voltage signals to the n display areas in sequence, and controls the n backlight areas to be turned 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 of the present invention, by partitioning the liquid crystal display panel and the backlight module, the time period during which the i-th display area is scanned, the The corresponding gray-scale voltage signal is applied to the i display areas, 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 turned on, which can reduce the response time of the liquid crystal during rotation. , Reducing the chance of being detected by the outside world, thereby improving the dynamic afterimage phenomenon.

10‧‧‧ Liquid crystal display device

11‧‧‧LCD display 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 Driven Unit

136‧‧‧sequence control unit

110‧‧‧display area

111‧‧‧scan line

112‧‧‧data cable

113‧‧‧Pixel Unit

114‧‧‧ Transistors

115‧‧‧ LCD Capacitor

120‧‧‧ backlight area

121, 121’‧‧‧ light source

122‧‧‧Optical diaphragm

122’‧‧‧light guide

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

FIG. 2 is a schematic diagram of an equivalent circuit of a liquid crystal display panel of the liquid crystal display device shown in FIG. 1.

3 is a schematic plan view of a backlight module of the liquid crystal display device shown in FIG. 1.

FIG. 4 is a schematic three-dimensional structure diagram of an embodiment of the backlight module shown in FIG. 3.

FIG. 5 is a schematic perspective structural 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 a 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 of a driving method of a liquid crystal display device according to a preferred embodiment of the present invention.

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

Please refer to FIG. 1. FIG. 1 is a 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 configured to provide a backlight to the liquid crystal display panel 11, and the liquid crystal display panel 11 is configured to receive a backlight and display a picture. The control circuit 13 is electrically connected to the liquid crystal display panel 11 and the backlight module 12, and is used to control 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 drive unit 134, and a data drive unit 135. Control Signal Office The 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 regions 110, where n is a natural number greater than or equal to two. The 1 ~ n display areas 110 are sequentially arranged along a direction away from the data driving unit 135. In one 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 regions 110.

Please refer to FIG. 2, which is a schematic diagram of an equivalent circuit 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 a small rectangular area formed by the intersection of the scan lines 111 and the data lines 112. Pixel unit 113. The complex pixel units 113 defined by the intersection of the scanning lines 111 and the data lines 112 constitute an array of pixel unit matrices.

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 scanning 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-shaped area extending along the direction where the scanning line 111 is located, and 1 to n display areas 110 are sequentially arranged along the direction where the data line 112 is located. Each display area 110 may correspond to The pixel unit 113 of one line, two lines, or plural lines can be specifically 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 the n display regions 110 one-to-one. Each backlight region 120 may be located directly below a corresponding display region 110. A backlight is provided to a corresponding one of the display areas 110, and the light emission brightness and on / off of each backlight area 120 can also be controlled separately. The backlight module 12 may be a direct-type backlight module or a side-type backlight module, and may be specifically selected according to actual needs.

Please refer to FIG. 4, which is a schematic diagram of a three-dimensional structure 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 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 to the above. The light source film 122 may be one sheet, two sheets, or a plurality of sheets, and a diffusion sheet, a light guide plate, and the like may be selected according to actual needs. Among them, the light source 121 corresponding to each backlight region 120 and the light sources 121 corresponding to other backlight regions 120 can be electrically connected independently of each other, so that the light source 121 corresponding to each backlight region 120 can be individually controlled to emit light, and can be turned on or off. Therefore, the light emission brightness, on and off of each backlight region 120 can be controlled individually.

Please refer to FIG. 5, which is a schematic diagram of a three-dimensional structure 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 linearly on one side of the light guide plate 122 '. The light source 121 'may be a white LED but is not limited to the above. A diffusion sheet, a brightness enhancement sheet, and the like may be further disposed above the light guide plate 122 ', and details are not described herein. In the embodiment, the light source 121 ′ corresponding to each backlight region 120 and the light source 121 ′ corresponding to other backlight regions 120 may be independent of each other, so that the light source 121 ′ corresponding to each backlight region 120 may be individually controlled to emit light, and may be turned on or off. Therefore, the light emission brightness, on and off of each backlight region 120 can be controlled individually.

In this embodiment, the liquid crystal display device 10 includes a first display mode and a second display mode. 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 the satisfaction of a preset detection condition, and issue a first mode control signal. The control signal or the second mode control signal is sent 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 as to control the signal processing unit 131 to generate and output the first mode control signal and the second mode control signal.

The preset detection condition may be a change in the format of the image data received by the control circuit 13. For example, if the data format of the normal display data and the virtual display data is different, the first mode control signal may be generated by detecting the data format. Or the second mode control signal. The preset detection condition may be that a preset gesture, motion, or touch action is detected, so as to generate a first mode control signal or a second mode control signal according to different preset gestures, actions, or touch actions. 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 a first display mode. As shown in FIGS. 6 (a) and (c), when the liquid crystal display device 10 enters the first display mode, the control signal processing unit 131 sends a first mode control signal to the display signal adjustment unit 132 and the backlight signal adjustment unit 133 to adjust the display signal. The unit 132 generates and outputs a first correction 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 a control signal according to the first correction timing and sequentially outputs a scan signal to the scan line 111 to scan the n display areas 110. The data driving unit 135 converts the original data signal into a grayscale voltage signal and sequentially applies the grayscale voltage signal to the data lines 112 of the n display areas 110 according to the first correction timing control signal control. The transistor 114 is turned on and the grayscale voltage is turned on. 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 correction backlight control signal.

In the first display mode, during the time period when the scan line of the i-th display area 110 is scanned, the corresponding gray-scale voltage signal is applied to the data lines of the i-th display area 110, and the The i backlight regions 120 are turned off, and the backlight regions 120 other than 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 FIGS. 6 (a) and (c), the original timing control signals including the original vertical synchronization signal V-sync and the first vertical synchronization correction signal V-sync1 are mainly used as an example for illustration.

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 (or high-level duration, that is, the gate on time) corresponding to the original level synchronization signal applied to each scanning line 111 is greater than the scanning applied to each scanning line 111 corresponding to the first calibration level 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 writing the gray-scale voltage signal to the liquid crystal capacitor 114; correspondingly, the first vertical synchronization The correction signal V-sync1 is obtained by correcting the vertical level synchronization signal V-sync. In one embodiment, the digital format vertical level synchronization signal V-sync may be modified in a digital modulation manner to correct it as the first vertical synchronization correction signal V-sync1. Of course, in another embodiment, if the vertical level synchronization signal V-sync is an analog signal format, the vertical level synchronization signal V-sync as shown in FIG. 6 (a) can also be corrected to The first vertical level 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 longer than the display time T2 of the frame corresponding to the first corrected vertical synchronization signal V-sync1, so the start time and end time of each frame are changed. The original vertical synchronization signal V-sync needs to be corrected to the first vertical synchronization signal V-sync1. Based on changes in the horizontal synchronization signal and the vertical synchronization signal, the pixel clock signal and the enable signal also need to be adjusted accordingly. Therefore, according to the actual needs, the first pixel clock correction signal can be generated based on the original pixel clock signal, and according to the original enable The energy signal generates a 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), and the first pulse width The correction signal New PWM 1 can also be obtained by correcting the original pulse width signal PWM. The frequency and duty ratio of the first pulse width correction signal New PWM 1 can be adjusted to adjust the current applied to the light source of the backlight module, thereby controlling The brightness and switch of each backlight region 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 in the display time T1 of one frame. In the first display mode, the i-th backlight region corresponding to the first corrected backlight control signal is at The luminous intensity of the time period Ts during 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 restoration of display data and brightness, the n backlights corresponding to the original backlight control signal The light emission amount of the region 120 in 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 corrected backlight control signal in 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 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 first correction backlight control signal corresponds to the first current intensity. The driving current intensity (New BLU 1) of the i backlight region 120 during the scanning period of the i-th 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 display data and brightness, the power consumption of the n backlight regions 120 corresponding to the original backlight control signal in one frame of the display time T1 and the n backlight regions 120 corresponding to the first corrected backlight control signal in one frame are The power consumption of T2 display time is basically equal.

Please refer to FIG. 7, which 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 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 adjustment unit 132 generates and outputs a 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, a frame display time is divided into a scanning period t1 and a sustain period t2. The scanning driving unit 134 generates and outputs a scanning signal to sequentially scan the n display areas 110 during the scanning period t1 according to the second correction timing control signal. 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 areas during the scanning period t1 according to the second correction timing control signal. The transistor 114 is turned on and the gray-scale voltage signal is turned on. Write the liquid crystal capacitor 115.

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

As before, the original timing control signal includes at least one of an original level synchronization signal, an original vertical synchronization signal V-sync, an original pixel clock signal, and an original enable signal. The second correction timing control signal includes a second level synchronization correction signal, Second vertical sync correction signal V-sync2 At least one of a second pixel clock correction signal and a second correction enable signal. In FIGS. 7 (a) and (c), the original timing control signals including the original vertical synchronization signal V-sync and the first vertical synchronization correction signal V-sync2 are mainly used as an example for illustration.

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 corresponding to the original level synchronization signal applied to each scanning line 111 is greater than the second correction level. The synchronization signal corresponds to the width of the scanning signal applied to each scanning line 111 and the width of the grayscale voltage signal applied to each data line 112, so that the turn-on time of each transistor 114 and the grayscale voltage signal are written into the liquid crystal. The time of the capacitor is reduced.

The second vertical synchronization correction signal is obtained by correcting the relative vertical level synchronization signal. The display time of a frame corresponding to the original vertical synchronization signal V-sync is longer than the display time of a frame corresponding to the second corrected vertical synchronization signal V-sync2. Therefore, the start time and the end time of each frame of the picture are changed, and the original vertical synchronization signal needs to be corrected to a second vertical synchronization correction signal. Based on changes in the horizontal sync signal and the vertical sync signal, the pixel clock signal and the enable signal also need to be adjusted accordingly. Therefore, according to actual needs, a second pixel clock correction signal can be generated based on the original pixel clock signal, and based on the original enable The energy signal generates a second correction enable signal.

The original backlight control signal may include the original pulse width signal (PWM), the second corrected backlight control signal includes the second pulse width correction signal (New PWM 2), and the second pulse width correction signal New PWM 2 may also perform the original pulse width signal PWM 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 duty cycle of the second pulse width correction signal, thereby controlling the brightness and switching of each backlight region 120 of the backlight module.

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

Since the light source of the backlight module 12 is driven by current, the light emission 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 driving 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 maintenance period t2 (New BLU 2) Is the third current intensity, and the third 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 regions corresponding to the original backlight control signal in a frame of the display time T1 and the n backlight regions 120 corresponding to the second corrected backlight control signal in a frame of the The power consumption amounts at the display time T3 are substantially equal.

Please refer to FIG. 8, which 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 1st to i-1th backlight areas, the i + 1th to the nth backlight areas are controlled to be turned on and the ith backlight area is turned off.

In step S1, the first corrected backlight control signal may be output through the backlight signal adjustment unit 133 to control the 1st to i-1th backlight regions 110, the i + 1th to the nth backlight regions 110 to turn on the light, 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 correction backlight control signal, wherein the 1st to i-1th backlight regions and the i + 1th to nth backlight regions are turned on to emit light and The i-th backlight area is off. In step S2, a scanning signal is provided to the i-th display area.

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

Specifically, the scan driving unit 134 may generate and sequentially output a 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 performed by the material driving unit 135. The data driving unit 135 converts the original data signal into a grayscale voltage signal and sequentially applies the grayscale 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 grayscale is turned on. The 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 also sends a 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 a first correction timing control signal to the scan drive unit 134 and the data drive 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 correction 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 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 and S6.

In step S5, during the scanning period t1, the output scanning signal sequentially scans the n display areas 110, sequentially applies the gray-scale voltage signals to the n display areas 110, and controls the n backlight areas 120 to be turned off. Specifically, the scan driving unit 134 sequentially scans the n display areas 110 by outputting the scanning signal, the data driving unit 135 sequentially applies the gray-scale voltage signals to the n display areas 110, and the backlight signal adjusting unit 133 controls the n backlight areas 120 to be turned off. .

In step S6, during the maintenance period t2, the 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 sustain period t2, the scan driving unit 134 and the data driving unit 135 may not apply a scanning signal and a grayscale voltage signal to the liquid crystal display panel 110, so as to keep 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. The timing control unit may be electrically connected to the display signal adjustment unit 132, the backlight signal adjustment unit 133, the scan drive unit 134, and the data drive 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 signals to the display signal adjustment unit 132, The backlight signal adjustment unit 133, the scan drive unit 134, the data drive unit 135, and the like.

In a modified embodiment, the liquid crystal display device 10 may have only the first display mode, that is, a liquid crystal display mode that is fully applicable to the virtual reality mode or other high-frequency display modes. At this time, the liquid crystal display device 10 may not be provided. The control signal processing unit does not need to switch modes. It only needs the display signal adjustment unit 132, the backlight signal adjustment unit 133, the scan drive unit 134, and the data drive unit 135 to directly execute the relevant 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 the driving method thereof of the present invention, by partitioning the liquid crystal display panel 11 and the backlight module 12, during the time period when the i-th display area 110 is scanned, the i-th display area 110 is correspondingly applied. Gray-scale voltage signal, the i-th backlight region 120 corresponding to the i-th display region 110 is turned off, and the backlight regions 120 other than the i-th backlight region 120 are turned on, which can reduce the response time of the liquid crystal during the rotation of the empty window, thereby improving dynamics Afterimage phenomenon.

The liquid crystal display device 10 includes two display modes. In the first display mode, the dynamic afterimage phenomenon can be improved by the partition control of the display area 110 and the backlight area 120. In the second display mode, the display time T of one frame is displayed. Divided into scan period t1 and maintenance period t2, in Scanning period t1 turns off the n backlight regions 120 of the backlight module 12 and turns on the n backlight regions 120 of the backlight module 12 during the maintenance period t2, which can also reduce the response window of the liquid crystal during rotation, thereby improving dynamics Afterimage phenomenon. In addition, the design of the two display modes can also allow users to switch according to their own needs, so that in the virtual reality display mode that is prone to dynamic afterimages, the LCD display panel 11 and the backlight module 12 are partitioned. 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 light 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 have a display time T1 of one frame. The n light-emitting areas corresponding to the first or second corrected backlight control signal have the same light-emitting amount at the display time T2 or T3 of one frame, thereby ensuring that the backlight module 12 provides an accurate light amount 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 with the first display mode, the design of mode switching can also achieve The technical effect of power saving in the second display mode.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims (8)

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 one to one to the n display areas, 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 is electrically connected to the liquid crystal display panel and the backlight module, and is configured to sequentially scan the n 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 time period when the i-th display area is scanned, the i-th display area is correspondingly applied Grayscale voltage signal, the i-th backlight region corresponding to the i-th display region is turned off, and the backlight regions other than the i-th backlight region are turned on, i is a natural number greater than or equal to 1 and less than or equal to n; 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 control according to the original timing. The 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 configured to generate and sequentially output a scanning signal to scan the n according to the first correction timing control signal. Display areas, the data driving unit is configured to convert the original data signals into the grayscale voltage signals and sequentially apply the grayscale voltage signals to the n displays according to the first correction timing control signal control Area, the backlight signal adjustment unit is configured 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 light emission of n backlight regions of the backlight module. The liquid crystal display device according to item 1 of the scope of patent application, wherein the original timing control signal includes at least one of an original level 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 level 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 corrected backlight control signal includes a first pulse width correction signal. The liquid crystal display device according to item 1 of the scope of patent application, wherein the luminous intensities of the n backlight regions corresponding to the original backlight control signal are set to a first intensity of display time in one frame. The luminous intensity of the i-th backlight region corresponding to a corrected backlight control signal during the time period when the i-th display region is scanned is the second intensity, the second intensity is greater than the first intensity, and the original backlight control signal corresponds to The light emission amount of the n backlight regions in the display time of one frame is equal to the light emission amount of the n backlight regions corresponding to the first corrected backlight control signal in the display time of one frame. The liquid crystal display device according to item 1 of the scope of patent application, 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 a first control signal according to an original timing control signal. A correction timing control signal to the scan driving unit and the data driving unit and controlling the backlight signal adjusting unit to generate the first corrected backlight control signal according to the original backlight control signal, and the scan driving unit is based on the first A correction timing control signal is generated and the scan signals are sequentially output to scan the n display areas. The data driving unit converts the original data signal into the grayscale voltage signal and according to the first correction timing control signal. The control sequentially applies the gray-scale voltage signals to the n display areas, so that The n backlight areas of the backlight module emit light under the control of the first corrected backlight control signal, wherein during the time period during which the i-th display area is scanned, a corresponding gray-scale voltage signal is applied to the i-th display area. The i-th backlight region corresponding to the i-th display region is turned off, and the backlight regions other than the i-th backlight region are turned on; in the second display mode, the control signal processing unit controls the display The signal adjustment unit generates and outputs 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 adjustment unit to generate a second correction backlight control according to the original backlight control signal. A signal, a frame display time is divided into a scanning period and a maintaining period, and the scanning driving unit generates and outputs the scanning signal to sequentially scan the n display areas in accordance with the second correction timing control signal during the scanning period , The data driving unit converts the original data signal into the grayscale voltage signal and according to the first The correction timing control signal controls sequentially applying the gray-scale voltage signals to the n display areas during the scanning period, and after a plurality of scanning lines are applied with a scanning signal during the scanning period, the liquid crystal display device From the scanning period to the maintenance period, the second corrected backlight control signal controls n backlight regions of the backlight module to be turned off during the scanning period and turned on during the maintenance period. The liquid crystal display device according to item 4 of the scope of patent application, 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 4 of the scope of patent application, wherein the control signal processing unit is configured to generate a first mode control signal and a second mode control signal based on a user's selection 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 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 according to item 4 of the scope of patent application, wherein the luminous intensities of the n backlight regions corresponding to the original backlight control signal are set to a first intensity of display time in one frame. The luminous intensity of the n backlight regions of the backlight module corresponding to the two corrected backlight control signals during the sustain period is a third intensity, the third intensity is greater than the first intensity, and the original backlight control signal corresponds to the The light emission amount of the n backlight regions in the display time of one frame is equal to the light emission amount of the n backlight regions corresponding to the second corrected backlight control signal in the display time of one frame. 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. 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, i + 1th to nth backlight areas are turned on and the ith backlight area is turned off; a scanning signal is provided to the ith display area; and a corresponding grayscale voltage signal is applied to the ith display area; output The first display mode control signal or the second display mode control signal, when the first display mode control signal is output, controls the 1st to i-1th backlight areas, the i + 1th to the nth backlight areas to turn on light, and the first The i backlight area is turned off; a scanning signal is provided to the i-th display area; and a corresponding gray-scale voltage signal is applied to the i-th display area; when the second display mode control signal is output, one frame of the screen is displayed Time is divided into a scanning period and a sustain period. During the scanning period, an output scanning signal sequentially scans the n display areas, applies a grayscale voltage signal to the n display areas in sequence, and controls the n backlights. The area is turned off, and the n backlight areas are controlled to be turned on at the same time during the sustain period.