Liquid crystal display device, and control device of liquid crystal panel

Abstract

To solve the problem that display quality may deteriorate when a plurality of images having different refresh rates are displayed on a liquid crystal display device.SOLUTION: In a liquid crystal display device, a data signal whose polarity is inverted periodically is supplied to a first region and a second region of a display portion, and display data in the first region and the second region is updated periodically. In a first period, a refresh rate of the first region is set to a first frequency, a refresh rate of the second region is set to a second frequency smaller than the first frequency, a polarity inversion rate of the data signal in the first period is set to a common frequency common to the first region and the second region, and the common frequency is equal to or less than the second frequency.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a liquid crystal display device. [Background technology]

[0002] Patent Document 1 discloses a method for improving display quality when switching between images with different refresh rates on a liquid crystal display device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2016-133630 Summary of the Invention [Problem to be solved by the invention]

[0004] When a liquid crystal display device displays a plurality of images with different refresh rates, the display quality may be degraded. [Means for solving the problem]

[0005] A liquid crystal display device according to one embodiment of the present disclosure is a liquid crystal display device having a display unit including a first region and a second region, in which a data signal whose polarity is periodically inverted is supplied to the first region and the second region, and in which display data in the first region and the second region is periodically updated, wherein, during a first period, the refresh rate of the first region is a first frequency and the refresh rate of the second region is a second frequency that is lower than the first frequency, and the polarity inversion rate of the data signal during the first period is a common frequency common to the first region and the second region, and the common frequency is lower than the second frequency. [Effects of the Invention]

[0006] It is possible to display multiple images with different refresh rates with high quality. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a block diagram showing a configuration of a liquid crystal display device according to an embodiment of the present invention. [Figure 2] 10A and 10B are explanatory diagrams showing an example of operation of the liquid crystal display device. [Figure 3] 10A and 10B are explanatory diagrams showing an example of operation of the liquid crystal display device. [Figure 4] FIG. 10 is an explanatory diagram showing a comparative example. [Figure 5] 10A and 10B are explanatory diagrams showing an example of operation of the liquid crystal display device. [Figure 6] 10A and 10B are explanatory diagrams showing an example of operation of the liquid crystal display device. [Figure 7] 10A and 10B are explanatory diagrams showing an example of operation of the liquid crystal display device. [Figure 8] 10A and 10B are explanatory diagrams showing an example of operation of the liquid crystal display device. [Figure 9] 10A and 10B are explanatory diagrams showing an example of operation of the liquid crystal display device. [Figure 10] 10A and 10B are explanatory diagrams showing an example of operation of the liquid crystal display device. [Figure 11] 10A and 10B are explanatory diagrams showing an example of operation of the liquid crystal display device. DETAILED DESCRIPTION OF THE INVENTION

[0008] Fig. 1 is a block diagram showing the configuration of a liquid crystal display device according to this embodiment. Fig. 2 is an explanatory diagram showing an example of the operation of the liquid crystal display device. As shown in Fig. 1, a liquid crystal display device 10 includes a display unit DA including a first area A1 and a second area A2, and a data signal whose polarity is periodically inverted is supplied to the first area A1 and the second area A2, and the display data in the first area A1 and the second area A2 is periodically updated.

[0009] 2, in the liquid crystal display device 10, in the first period T1, the refresh rate of the first region A1 is set to a first frequency, and the refresh rate of the second region A2 is set to a second frequency that is lower than the first frequency (for example, half the first frequency in FIG. 2), and the polarity inversion rate of the data signal in the first period T1 is set to a common frequency that is common to the first region A1 and the second region A2, and the common frequency is equal to or lower than the second frequency (for example, the second frequency in FIG. 2). Refreshing is updating (writing) display data, and the display data itself may or may not be changed by refreshing.

[0010] In this way, the same polarity period (half the polarity cycle) during which the same polarity is maintained in the first and second regions A1 and A2 is the same as or longer than the refresh period (refresh interval) of the second region A2, thereby reducing the polarity bias of the voltage applied to the second region A2 (the DC component applied to the second region A2). This allows multiple images (images in the first and second regions A1 and A2) with different refresh rates to be displayed with high quality. Furthermore, power consumption is reduced compared to when the refresh rate of the second region A2 is set to the first frequency (matched to the first region A1), and frame rate upconversion is unnecessary. In Figures 1 and 2, moving images may be displayed in the first region A1 and still images may be displayed in the second region A2.

[0011] The common frequency may be a common divisor of the first frequency and the second frequency, or may be the greatest common divisor of the first frequency and the second frequency, or may be an integer less than or equal to this greatest common divisor.

[0012] In the liquid crystal display device 10, the polarity inversion rate of the entire display unit DA including the first and second regions A1 and A2 may be a common frequency. The liquid crystal display device 10 includes a group of scanning signal lines 3 aligned in a first direction D1 and a group of data signal lines 4 aligned in a second direction D2 perpendicular to the first direction D1, and the first region A1 and the second region A2 may not overlap each other and may be located at different positions in the first direction D1.

[0013] 1, a liquid crystal display device 10 may include a liquid crystal panel 5 including a first region A1, a second region A2, a group of scanning signal lines 2 that are sequentially scanned, a group of data signal lines 3 to which data signals are supplied, and scan drivers 7A and 7B that drive the group of scanning signal lines 2, a data driver 8 that drives the group of data signal lines 3, and a control device 15 that controls the scan drivers 7A and 7B and the data driver 8. The liquid crystal panel 5 may include a TFT substrate, a counter substrate, and a liquid crystal layer located between the TFT substrate and the counter substrate.

[0014] Each of the first and second regions A1 and A2 includes a plurality of sub-pixels, each of which has a liquid crystal capacitor including a pixel electrode and a counter electrode, and the voltage held in the liquid crystal capacitor corresponds to the display data of the sub-pixel. If each sub-pixel includes a color filter of a predetermined color, the sub-pixel displays a predetermined color with a gradation corresponding to the display data. The color filter may be provided on the counter substrate. The pixel electrode and the counter electrode (common electrode) may be provided on the TFT substrate (horizontal electric field mode). Alternatively, the pixel electrode may be provided on the TFT substrate, and the counter electrode (common electrode) may be provided on the counter substrate (vertical electric field mode).

[0015] The control device 15 includes a video input unit 11, a video processing unit 12, a timing signal generation unit 13, and an output signal generation unit 14. The video input unit 11 receives video data from an external device. The video processing unit 12 processes the video data received from the video input unit 11. The timing signal generation unit 13 generates a timing signal based on a common frequency stored in an internal memory and the video data received from the video input unit 11. The output signal generation unit 14 generates an output signal using the timing signal received from the timing signal generation unit 13 and the video data processed by the video processing unit 12, and supplies this output signal to the scan drivers 7A and 7B and the data driver 8. The control device 15 may be a timing controller. The control device 15 and the data driver (source driver) 8 may be separate LSIs or may be an integrated LSI. The common frequency may be stored in the memory of the control device 15 or may be read out from an external device by the control device 15. The common frequency may be a fixed value or a parameter corresponding to the video data.

[0016] 2, the period (refresh period) during which the first region A1 is refreshed for the nth frame (n is a natural number) is designated as Fn, and the period (refresh period) during which the second region A2 is refreshed for the nth frame is designated as fn. The first period T1 in FIG. 2 includes scanning periods (F2, F4, F6, etc.) during which the multiple scanning signal lines corresponding to the first region A1 are scanned to refresh the first region A1, but the multiple scanning signal lines corresponding to the second region A2 are not scanned to refresh the second region A2, and scanning periods (F1(f1), F3(f2), F5(f3)), etc.) during which the multiple scanning signal lines corresponding to the first region A1 and the multiple scanning signal lines corresponding to the second region A2 are scanned. That is, the first period T1 may include a scanning period (vertical scanning period) that includes Fn and fm (m is a natural number) and a scanning period (vertical scanning period) that includes Fn but not fm. In a scanning period (vertical scanning period) including Fn and fm, Fn may be a period before or after fm. The data signals during the scanning period (vertical scanning period) may be maintained at the same polarity (positive or negative). Then, during the scanning periods (F1 (f1), F7 (f4), and F13 (f7)) where the polarity of the data signals is inverted, multiple scanning signal lines corresponding to the first region A1 and multiple scanning signal lines corresponding to the second region A2 are scanned.

[0017] Fig. 3 is an explanatory diagram showing an example of the operation of the present liquid crystal display device. In Fig. 3, in the first period T1, the refresh rate (first frequency) of the first region A1 is set to 60 [Hz], the refresh rate (second frequency) of the second region A2 is set to 30 [Hz], and the polarity inversion rate (common frequency) of the data signal in the first period T1 is set to 10 [Hz], which is lower than the second frequency. Specifically, F1 to F6 (f1 to f3) are 0.1 [seconds], and the common frequency is a common divisor of the first frequency and the second frequency.

[0018] In the case of Figure 3, the same polarity period (0.1 seconds) during which the same polarity is maintained is longer than the refresh period of the second area A2 (0.033 seconds). In addition, the scanning period (corresponding to F1, F7, and F13) of the polarity inversion timing of the data signal matches the refresh period f1, f4, and f7 of the second area A2 (the second area A2 is refreshed during the scanning period during which the polarity of the data signal is inverted), so the polarity bias of the voltage applied to the second area A2 (the DC component applied to the second area A2) can be reduced.

[0019] FIG. 4 is an explanatory diagram showing a comparative example. In FIG. 4, the refresh rate of the first area A1 is 60 Hz, the refresh rate of the second area A2 is 30 Hz, and the polarity inversion rate common to the first and second areas A1 and A2 is 60 Hz. In the case of FIG. 4, the same polarity period during which the same polarity is maintained is shorter than the refresh cycle of the second area A2, so the same polarity is written in each of the refresh periods f1 to f10 of the second area A2. This increases the polarity bias of the voltage applied to the second area A2 (the DC component applied to the second area A2), degrading display quality.

[0020] Fig. 5 is an explanatory diagram showing an example of the operation of the present liquid crystal display device. In Fig. 5, in the first period T1, the refresh rate (first frequency) of the first region A1 is set to 60 [Hz], the refresh rate (second frequency) of the second region A2 is set to 10 [Hz], and the polarity inversion rate (common frequency) of the data signal in the first period T1 is set to 5 [Hz], which is lower than the second frequency. Specifically, F1 to F6 (f1 to f3) are 0.1 [seconds], and the common frequency is a common divisor of the first frequency and the second frequency.

[0021] In the case of Figure 5, the same polarity period (0.2 seconds) during which the same polarity is maintained is longer than the refresh period of the second area A2 (0.1 seconds). In addition, the scanning period (corresponding to F1-F13) of the polarity inversion timing of the data signal matches the refresh period f1-f3 of the second area A2 (the second area A2 is refreshed during the scanning period during which the polarity of the data signal is inverted), so the polarity bias of the voltage applied to the second area A2 (the DC component applied to the second area A2) can be reduced.

[0022] FIG. 6 is an explanatory diagram showing an example of the operation of the present liquid crystal display device. In FIG. 6, during the first period T1, the refresh rate (first frequency) of the first region A1 is set to 60 Hz, the refresh rate (second frequency) of the second region A2 is set to 30 Hz, and the polarity inversion rate (common frequency) of the data signal during the first period T1 is set to 10 Hz, which is lower than the second frequency. Furthermore, during the second period T2 following the first period T1, the refresh rate (first frequency) of the first region A1 is set to 60 Hz, and the refresh rate of the second region A2 is changed to a third frequency of 60 Hz, and the polarity inversion rate (common frequency) of the data signal during the second period T2 is maintained at 10 Hz. In other words, even if the refresh rate of the second region A2 is changed to a third frequency higher than the second frequency (e.g., a multiple of the second frequency), the common frequency is not changed. In the second period T2, the period (refresh period) during which the second area A2 is refreshed for the nth frame (n is a natural number) is set to Xn.

[0023] 6, during the scanning period (corresponding to F13-F19) of the polarity inversion timing of the data signal, the multiple scanning signal lines corresponding to the first region A1 and the multiple scanning signal lines corresponding to the second region A2 are scanned. During the second period T2, the same polarity period (0.1 seconds) during which the same polarity is maintained is longer than the refresh period (0.1 seconds / 6) of the second region A2. In addition, the scanning period (corresponding to F13-F19) of the polarity inversion timing of the data signal matches the refresh period X5-X11 of the second region A2, so the polarity bias of the voltage applied to the second region A2 (the DC component applied to the second region A2) can be reduced.

[0024] FIG. 7 is an explanatory diagram showing an example of the operation of the present liquid crystal display device. In FIG. 7, during the first period T1, the refresh rate (first frequency) of the first region A1 is set to 60 Hz, the refresh rate (second frequency) of the second region A2 is set to 30 Hz, and the polarity inversion rate (common frequency) of the data signal during the first period T1 is set to 10 Hz, which is lower than the second frequency. Furthermore, during the second period T2 following the first period T1, the refresh rate (first frequency) of the first region A1 is set to 60 Hz, and the refresh rate of the second region A2 is changed (switched) to a third frequency of 10 Hz, and the polarity inversion rate (common frequency) of the data signal during the second period T2 is maintained at 10 Hz. In other words, even if the refresh rate of the second region A2 is changed to a third frequency (e.g., a submultiple of the second frequency) that is lower than the second frequency but higher than the common frequency, the common frequency remains unchanged. In the second period T2, the period (refresh period) during which the second area A2 is refreshed for the nth frame (n is a natural number) is set to Xn.

[0025] 7 includes scanning periods (F12-F14, etc.) in which the multiple scanning signal lines corresponding to the first region A1 are scanned to refresh the first region A1, but the multiple scanning signal lines corresponding to the second region A2 are not scanned to refresh the second region A2, and scanning periods (F11(X1)-F17(X2), etc.) in which the multiple scanning signal lines corresponding to the first region A1 and the multiple scanning signal lines corresponding to the second region A2 are scanned. In the second period T2, during scanning periods (corresponding to F13-F19) at the timing of polarity inversion of the data signal, the multiple scanning signal lines corresponding to the first region A1 and the multiple scanning signal lines corresponding to the second region A2 are scanned.

[0026] Furthermore, even if the polarity inversion timing of the data signal does not coincide with the refresh timing (refresh period) of the second region A2 during the second period T2, the plurality of scanning signal lines corresponding to the second region A2 are scanned during the scanning period of the polarity inversion timing. That is, the plurality of scanning signal lines corresponding to the second region A2 are scanned during the scanning period of the polarity inversion timing (including F13) in Fig. 7, thereby forcibly rewriting the first frame after switching, and the plurality of scanning signal lines corresponding to the second region A2 are scanned during the scanning period of the polarity inversion timing (including F19), thereby forcibly rewriting the second frame after switching.

[0027] In the second period T2 in Figure 7, the same polarity period (0.1 seconds) during which the same polarity is maintained is the same as the refresh period of the second region A2. In addition, the scanning period (corresponding to F13-F19) of the polarity inversion timing of the data signal matches the refresh period X1-X2 (rewrite) of the second region A2 (the second region A2 is refreshed during the scanning period during which the polarity of the data signal is inverted), so the polarity bias of the voltage applied to the second region A2 (the DC component applied to the second region A2) can be reduced.

[0028] Figure 8 is an explanatory diagram showing an example of the operation of this liquid crystal display device. In Figure 7, X1 and X2 are rewritten (forced written) during the second period T2, but if this is not done, the polarities of the first and second regions A1 and A2 will be different between F13 to F16 and F19 to F20 during the second period T2, as shown in Figure 8. This should not affect the display quality, but if it does, control should be performed as shown in Figure 7.

[0029] FIG. 9 is an explanatory diagram showing an example of the operation of the present liquid crystal display device. In FIG. 9, during the first period T1, the refresh rate (first frequency) of the first region A1 is set to 60 Hz, the refresh rate (second frequency) of the second region A2 is set to 30 Hz, and the polarity inversion rate (common frequency) of the data signal during the first period T1 is set to 10 Hz, which is lower than the second frequency. Furthermore, during the second period T2 following the first period T1, the refresh rate (first frequency) of the first region A1 is set to 60 Hz, and the refresh rate of the second region A2 is changed (switched) to a third frequency of 10 Hz, and the polarity inversion rate (common frequency) of the data signal during the second period T2 is maintained at 10 Hz. In other words, even if the refresh rate of the second region A2 is changed to a third frequency (e.g., a submultiple of the second frequency) that is lower than the second frequency but higher than the common frequency, the common frequency remains unchanged. In the second period T2, the period (refresh period) during which the second area A2 is refreshed for the nth frame (n is a natural number) is set to Xn.

[0030] As shown in Figure 9, the second area A2 may be updated with the same display data (fifth frame) one or more times at the end of the first period T1 so that the start of the second period T2 coincides with the polarity inversion timing of the data signal (corresponding to F13).

[0031] In the second period T2 in Figure 9, the same polarity period (0.1 seconds) during which the same polarity is maintained is the same as the refresh period of the second area A2. In addition, the scanning period (corresponding to F13-F19) of the polarity inversion timing of the data signal matches the refresh period X1-X2 of the second area A2. This reduces the polarity bias of the voltage applied to the second area A2 (the DC component applied to the second area A2).

[0032] FIG. 10 is an explanatory diagram showing an example of the operation of the present liquid crystal display device. In FIG. 10, during the first period T1, the refresh rate (first frequency) of the first region A1 is set to 60 Hz, the refresh rate (second frequency) of the second region A2 is set to 30 Hz, and the polarity inversion rate (common frequency) of the data signal during the first period T1 is set to 10 Hz, which is lower than the second frequency. Furthermore, during the second period T2 following the first period T1, the refresh rate (first frequency) of the first region A1 is changed (switched) to a fourth frequency of 30 Hz, while the refresh rate of the second region A2 is maintained at 30 Hz and the polarity inversion rate (common frequency) of the data signal during the second period T2 is maintained at 10 Hz. During the second period T2, the period (refresh period) during which the first region A1 is refreshed for the nth frame (n is a natural number) is designated as Xn. In this way, the fourth frequency may be equal to or higher than the common frequency but lower than the first frequency.

[0033] In the second period T2 in Figure 10, the same polarity period (0.1 seconds) during which the same polarity is maintained is longer than the refresh period of the second area A2. In addition, the scanning period (corresponding to X1 and X4) of the polarity inversion timing of the data signal matches the refresh period f7 and f10 of the second area A2, so the polarity bias of the voltage applied to the second area A2 (the DC component applied to the second area A2) can be reduced.

[0034] FIG. 11 is an explanatory diagram showing an example of the operation of the present liquid crystal display device. In FIG. 11, during the first period T1, the refresh rate (first frequency) of the first region A1 is set to 30 Hz, the refresh rate (second frequency) of the second region A2 is set to 10 Hz, and the polarity inversion rate (common frequency) of the data signal during the first period T1 is set to 10 Hz, which is lower than the second frequency. Furthermore, during the second period T2 following the first period T1, the refresh rate (first frequency) of the first region A1 is changed (switched) to a fourth frequency of 60 Hz, the refresh rate of the second region A2 is maintained at 10 Hz, and the polarity inversion rate (common frequency) of the data signal during the second period T2 is maintained at 10 Hz. During the second period T2, the period (refresh period) during which the first region A1 is refreshed for the nth frame (n is a natural number) is designated as Xn. In this way, the fourth frequency may be higher than the first frequency.

[0035] In the second period T2 in Figure 11, the same polarity period (0.1 seconds) during which the same polarity is maintained is the same as the refresh period of the second area A2. In addition, the scanning period (corresponding to X1 and X7) of the polarity inversion timing of the data signal matches the refresh period f3 and f4 of the second area A2, so the polarity bias of the voltage applied to the second area A2 (the DC component applied to the second area A2) can be reduced.

[0036] In the liquid crystal display device 10, the display section DA may have three or more regions with different refresh rates, including the first region A1 and the second region A2, and the polarity inversion rate of the data signal in the first period T1 may be a common frequency common to the three or more regions. In the liquid crystal display device 10, the common frequency may be 30 Hz or less, 20 Hz or less, 10 Hz or less, or 5.0 Hz or less, or may be 1.0 Hz. The refresh rate of the second region A2 and the common frequency may be 1.0 Hz.

[0037] In the liquid crystal display device 10, the impedance of the liquid crystal layer and its alignment film may be matched. For example, the ratio of the product of the resistance of the liquid crystal layer and the liquid crystal capacitance to the product of the resistance of the alignment film and the capacitance of the alignment film may be set to 0.8 to 1.2 or 0.9 to 1.1. This can further improve image retention, flicker, and the like.

[0038] The control device 15 shown in Figure 1 supplies a data signal whose polarity is periodically inverted to the first area A1 and the second area A2 of the liquid crystal panel 5 having a display unit DA including the first area A1 and the second area A2, and periodically updates the display data of the first area A1 and the second area A2.

[0039] As shown in Figures 2, 3, 5 to 11, in the first period T1, the control device 15 sets the refresh rate of the first region A1 to a first frequency, sets the refresh rate of the second region A2 to a second frequency that is lower than the first frequency, and sets the polarity inversion rate of the data signal in the first period T1 to a common frequency that is common to the first region A1 and the second region A2, and the common frequency is lower than the second frequency.

[0040] The above-described embodiments are intended to be illustrative and explanatory, and not limiting, and many variations will be apparent to those skilled in the art based on these examples and descriptions. [Explanation of symbols]

[0041] 3 Scanning signal lines 4 Data signal lines 5 LCD panel 10 LCD display device 15 Control device DA display A1 1st area A2 2nd area T1 1st period T2 2nd period

Claims

1. A liquid crystal display device comprising: a display unit including a first region and a second region; a data signal whose polarity is periodically inverted is supplied to the first region and the second region; and display data in the first region and the second region is periodically updated; In a first period, a refresh rate of the first region is set to a first frequency, and a refresh rate of the second region is set to a second frequency that is lower than the first frequency; A liquid crystal display device, wherein the polarity inversion rate of the data signal in the first period is set to a common frequency common to the first region and the second region, and the common frequency is equal to or lower than the second frequency.

2. The liquid crystal display device according to claim 1 , wherein the common frequency is a polarity inversion rate for the entire display unit.

3. The liquid crystal display device according to claim 1 , wherein the common frequency is a common divisor of the first frequency and the second frequency.

4. a group of scanning signal lines aligned in a first direction and a group of data signal lines aligned in a second direction perpendicular to the first direction, The liquid crystal display device according to claim 1 , wherein the first region and the second region are positioned at different positions in the first direction.

5. 5. The liquid crystal display device according to claim 4, wherein the first period includes a scanning period in which a plurality of scanning signal lines corresponding to the first region are scanned to refresh the first region, while a plurality of scanning signal lines corresponding to the second region are not scanned to not refresh the second region, and a scanning period in which a plurality of scanning signal lines corresponding to the first region and a plurality of scanning signal lines corresponding to the second region are scanned.

6. 6. The liquid crystal display device according to claim 5, wherein in the first period, a scanning period corresponding to a polarity inversion timing of the data signal includes scanning a plurality of scanning signal lines corresponding to the first region and a plurality of scanning signal lines corresponding to the second region.

7. The liquid crystal display device according to claim 1 , wherein when the refresh rate of the second region is changed to a third frequency during a second period, the common frequency is not changed.

8. The liquid crystal display device according to claim 7 , wherein the third frequency is greater than the second frequency.

9. The liquid crystal display device according to claim 7 , wherein the third frequency is equal to or greater than the common frequency and is lower than the second frequency.

10. 8. The liquid crystal display device according to claim 7, wherein the second period includes a scanning period in which a plurality of scanning signal lines corresponding to the first region are scanned to refresh the first region, while a plurality of scanning signal lines corresponding to the second region are not scanned to not refresh the second region, and a scanning period in which a plurality of scanning signal lines corresponding to the first region and a plurality of scanning signal lines corresponding to the second region are scanned.

11. 11. The liquid crystal display device according to claim 10, wherein in the second period, a scanning period corresponding to a polarity inversion timing of the data signal includes scanning a plurality of scanning signal lines corresponding to the first region and a plurality of scanning signal lines corresponding to the second region.

12. 12. The liquid crystal display device according to claim 11, wherein, even if a polarity inversion timing of the data signal does not coincide with a refresh timing of the second region during the second period, a plurality of scanning signal lines corresponding to the second region are scanned at the polarity inversion timing.

13. 12. The liquid crystal display device according to claim 11, wherein the second region is updated with the same display data one or more times at the end of the first period so that the start of the second period coincides with the polarity inversion timing of the data signal.

14. The liquid crystal display device according to claim 1 , wherein when the refresh rate of the first region is changed to a fourth frequency during the second period, the common frequency is not changed.

15. The liquid crystal display device of claim 14 , wherein the fourth frequency is equal to or greater than the common frequency and is lower than the first frequency.

16. The liquid crystal display device according to claim 14 , wherein the fourth frequency is greater than the first frequency.

17. 17. The liquid crystal display device according to claim 1, wherein the common frequency is 10 Hz or less.

18. 18. The liquid crystal display device according to claim 17, wherein the common frequency is 1.0 Hz.

19. a scan driver that drives the group of scanning signal lines, a data driver that drives the group of data signal lines, and a control unit that controls the scan driver and the data driver; The liquid crystal display device according to claim 4 , wherein the control unit includes a memory in which the common frequency is stored.

20. 17. The liquid crystal display device according to claim 1, wherein a moving image is displayed in the first area and a still image is displayed in the second area.

21. the display unit includes three or more regions having different refresh rates, including the first region and the second region; 17. The liquid crystal display device according to claim 1, wherein a polarity inversion rate of the data signal in the first period is set to the common frequency common to the three or more regions.

22. A liquid crystal panel control device that supplies a data signal whose polarity is periodically inverted to a liquid crystal panel having a display unit including a first region and a second region, to the first region and the second region, and periodically updates display data of the first region and the second region, In a first period, a refresh rate of the first region is set to a first frequency, and a refresh rate of the second region is set to a second frequency that is lower than the first frequency; A control device for a liquid crystal panel, wherein the polarity inversion rate of the data signal in the first period is set to a common frequency common to the first region and the second region, and the common frequency is equal to or lower than the second frequency.

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