CN114360465B - Liquid crystal display device and driving method thereof - Google Patents
Liquid crystal display device and driving method thereof Download PDFInfo
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- CN114360465B CN114360465B CN202111619465.1A CN202111619465A CN114360465B CN 114360465 B CN114360465 B CN 114360465B CN 202111619465 A CN202111619465 A CN 202111619465A CN 114360465 B CN114360465 B CN 114360465B
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Abstract
The embodiment of the invention discloses a liquid crystal display device and a driving method of the liquid crystal display device, comprising a pixel electrode, a viewing angle control electrode and a display control circuit, wherein the pixel electrode is configured to receive a pixel driving signal; in the narrow viewing angle mode, there are adjacent first and second refresh frames, there are adjacent first and second pixel electrodes, and the following is satisfied: the voltage difference change rule of the pixel driving signal and the visual angle control signal of the first pixel electrode in the first refresh frame is consistent with the voltage difference change rule of the pixel driving signal and the visual angle control signal of the second pixel electrode in the second refresh frame; the voltage difference change rule of the pixel driving signal and the visual angle control signal of the first pixel electrode in the second refresh frame is consistent with the voltage difference change rule of the pixel driving signal and the visual angle control signal of the second pixel electrode in the first refresh frame.
Description
Technical Field
Embodiments of the present invention relate to display technologies, and in particular, to a liquid crystal display device and a driving method of the liquid crystal display device.
Background
Liquid crystal display devices are now gradually evolving toward a wide viewing angle, such as those employing in-plane switching (IPS) or Fringe Field Switching (FFS) modes, to achieve a wide viewing angle. However, with the increasing awareness of privacy protection, the wide viewing angle display screen cannot meet the needs of users, and in the occasion of peeping prevention, the display device needs to be switched or adjusted to a narrow viewing angle mode.
In the prior art, a viewing angle control electrode is arranged on one side of a color film substrate, and voltage is applied to the viewing angle control electrode, so that a vertical electric field is generated between the viewing angle control electrode and a common electrode and acts on liquid crystal molecules, thereby realizing a narrow viewing angle mode. However, the pixel electrode and the viewing angle control electrode are coupled to form an electric field, and voltages applied by the pixel electrode and the viewing angle control electrode are different, so that the electric field generated between the pixel electrode and the viewing angle control electrode is different, and further the inversion of the liquid crystal is affected, and the display panel has brightness difference and uneven display.
Disclosure of Invention
The invention provides a liquid crystal display device and a driving method thereof, which are used for solving the problem of uneven display of the liquid crystal display device in a narrow viewing angle mode.
In a first aspect, an embodiment of the present invention provides a liquid crystal display device, including a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate;
a plurality of pixel units are formed on the first substrate, pixel electrodes are arranged in the pixel units, and a common electrode is also arranged on the first substrate; the second substrate is provided with a visual angle control electrode;
the common electrode is configured to receive a common voltage signal, the pixel electrode is configured to receive a pixel driving signal, and the viewing angle control electrode is configured to receive a viewing angle control signal in a narrow viewing angle mode;
in the liquid crystal display device in the narrow viewing angle mode, there are two adjacent refresh frames including a first refresh frame and a second refresh frame, and there are two adjacent pixel electrodes including a first pixel electrode and a second pixel electrode, satisfying:
a voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame is identical to a voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame;
A voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame is identical to a voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame.
In a second aspect, an embodiment of the present invention further provides a driving method of a liquid crystal display device, for driving the liquid crystal display device of the first aspect, where the driving method includes:
in the narrow viewing angle mode, pixel driving signals are applied to the pixel electrodes, and simultaneously viewing angle control signals are applied to the viewing angle control electrodes, so that in the liquid crystal display device, two adjacent refresh frames comprise a first refresh frame and a second refresh frame, two adjacent pixel electrodes comprise a first pixel electrode and a second pixel electrode, and the following conditions are satisfied:
a voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame is identical to a voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame;
A voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame is identical to a voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame.
In the embodiment of the invention, in the liquid crystal display device in the narrow viewing angle mode, in two adjacent refresh frames, the voltage difference change rule of the pixel driving signal configured by the first pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the first refresh frame is consistent with the voltage difference change rule of the pixel driving signal configured by the second pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the second refresh frame, so that the coupling condition of the two adjacent pixel electrodes and the viewing angle control electrode is the same, and the influence on liquid crystal molecules in the liquid crystal layer is the same; the voltage difference change rule of the pixel driving signals configured by the first pixel electrode and the visual angle control signals configured by the visual angle control electrodes in the second refresh frame is consistent with the voltage difference change rule of the pixel driving signals configured by the second pixel electrode and the visual angle control signals configured by the visual angle control electrodes in the first refresh frame, so that the coupling condition of the adjacent two pixel electrodes and the visual angle control electrodes is the same, and meanwhile, the influence on liquid crystal molecules in the liquid crystal layer is the same, and therefore, the coupling condition of the adjacent two pixel electrodes and the visual angle control electrodes in the adjacent two refresh frames is equivalent as the voltage difference change rule in the adjacent two refresh frames, and further, the display unevenness of the liquid crystal display device can be improved, and the polarization of the liquid crystal molecules in the liquid crystal layer is avoided.
Drawings
Fig. 1 is a schematic cross-sectional view of a liquid crystal display device according to the related art at a wide viewing angle;
fig. 2 is a schematic cross-sectional view of a liquid crystal display device according to the related art at a narrow viewing angle;
FIG. 3 is a schematic cross-sectional view of a liquid crystal display device according to an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the operation timing of an adjacent refresh frame of the LCD device of FIG. 3 at a narrow viewing angle;
FIG. 5 is a schematic diagram showing the operation timing of another adjacent refresh frame of the LCD device of FIG. 3 at a narrow viewing angle;
FIG. 6 is a schematic diagram showing the operation timing of another adjacent refresh frame of the LCD device of FIG. 3 at a narrow viewing angle;
fig. 7 is a schematic diagram of a pixel circuit structure of a liquid crystal display device according to an embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of FIG. 7;
FIG. 9 is a schematic diagram showing the operation timing of another adjacent refresh frame of the LCD device of FIG. 3 at a narrow viewing angle;
FIG. 10 is a schematic diagram showing the operation timing of another adjacent refresh frame of the LCD device of FIG. 3 at a narrow viewing angle;
fig. 11 is a schematic diagram showing an operation timing sequence of another adjacent refresh frame of the lcd device in fig. 3 at a narrow viewing angle.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Fig. 1 is a schematic cross-sectional structure of a related art liquid crystal display device at a wide viewing angle, and fig. 2 is a schematic cross-sectional structure of a related art liquid crystal display device at a narrow viewing angle, and referring to fig. 1 to 2, the liquid crystal display device includes a first substrate 10', a second substrate 20', and a liquid crystal layer 30 'disposed between the first substrate 10' and the second substrate 20', wherein the first substrate 10' is provided with a common electrode 11 'and a pixel electrode 12' at a side near the liquid crystal layer 30', and the second substrate 20' is provided with a viewing angle control electrode 21 'at a side near the liquid crystal layer 30'. When the liquid crystal display panel requires wide viewing angle display, the viewing angle control electrode 21' of the second substrate 20' does not apply a voltage signal, and the liquid crystal layer 30' is deflected only under an in-plane electric field formed between the pixel electrode 12' and the common electrode 11', and at this time, the liquid crystal display device realizes wide viewing angle display. When the liquid crystal display panel needs to display at a narrow viewing angle, the viewing angle control electrode 21 'of the second substrate 20' applies a voltage different from that of the common electrode 11', so that a certain potential difference exists between the viewing angle control electrode 21' and the common electrode 11', at this time, an electric field E (see fig. 2) perpendicular to the plane of the substrate is generated between the viewing angle control electrode 21' and the common electrode 11', and the liquid crystal molecules in the liquid crystal layer 30' tilt and tilt under the action of the perpendicular electric field E, and form a certain included angle with the plane of the substrate, so that the contrast of the liquid crystal display device in the large viewing angle direction is reduced, and the narrow viewing angle display is realized.
However, during the display with a narrow viewing angle, the voltage on the pixel electrode 12 'is also coupled with the viewing angle control electrode 21' to generate an electric field E '(see fig. 2) perpendicular to the plane of the substrate, and the electric field E' generated by coupling the different pixel electrodes 12 'with the viewing angle control electrode 21' is also different due to different driving voltages applied to the different pixel electrodes, so that the inversion of the liquid crystal molecules is affected, resulting in the brightness difference and uneven display of the liquid crystal display panel.
Based on the technical problems described above, an embodiment of the present invention provides a liquid crystal display device, including a first substrate, a second substrate, and a liquid crystal layer between the first substrate and the second substrate; a plurality of pixel units are formed on the first substrate, pixel electrodes are arranged in the pixel units, and a common electrode is also arranged on the first substrate; the second substrate is provided with a visual angle control electrode; the common electrode is configured to receive a common voltage signal, the pixel electrode is configured to receive a pixel driving signal, and the viewing angle control electrode is configured to receive a viewing angle control signal in a narrow viewing angle mode; in a liquid crystal display device in a narrow viewing angle mode, there are two adjacent refresh frames including a first refresh frame and a second refresh frame, and there are two adjacent pixel electrodes including a first pixel electrode and a second pixel electrode, satisfying: the voltage difference change rule of the pixel driving signal configured by the first pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the first refresh frame is consistent with the voltage difference change rule of the pixel driving signal configured by the second pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the second refresh frame; the voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame is identical to the voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame.
By adopting the technical scheme, in the liquid crystal display device in the narrow viewing angle mode, in two adjacent refresh frames, the voltage difference change rule of the pixel driving signal configured by the first pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the first refresh frame is consistent with the voltage difference change rule of the pixel driving signal configured by the second pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the second refresh frame, so that the coupling condition of the two adjacent pixel electrodes and the viewing angle control electrode is the same, and the influence on liquid crystal molecules in the liquid crystal layer is the same; the voltage difference change rule of the pixel driving signals configured by the first pixel electrode and the visual angle control signals configured by the visual angle control electrodes in the second refresh frame is consistent with the voltage difference change rule of the pixel driving signals configured by the second pixel electrode and the visual angle control signals configured by the visual angle control electrodes in the first refresh frame, so that the coupling condition of the adjacent two pixel electrodes and the visual angle control electrodes is the same, and meanwhile, the influence on liquid crystal molecules in the liquid crystal layer is the same, and therefore, the coupling condition of the adjacent two pixel electrodes and the visual angle control electrodes in the adjacent two refresh frames is equivalent as the voltage difference change rule in the adjacent two refresh frames, and further, the display unevenness of the liquid crystal display device can be improved, and the polarization of the liquid crystal molecules in the liquid crystal layer is avoided.
The foregoing is the core idea of the present application, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention.
Fig. 3 is a schematic cross-sectional structure of a liquid crystal display device according to an embodiment of the present invention, and fig. 4 is a schematic operation timing diagram of an adjacent refresh frame of the liquid crystal display device in fig. 3 at a narrow viewing angle, and, in combination with fig. 3 to fig. 4, the liquid crystal display device includes a first substrate 10, a second substrate 20, and a liquid crystal layer 30 between the first substrate 10 and the second substrate 20; a plurality of pixel units 11 are formed on the first substrate 10, pixel electrodes 111 are arranged in the pixel units 11, and a common electrode 12 is also arranged on the first substrate 10; the second substrate 20 is provided with a viewing angle control electrode 21; the common electrode 12 is configured to receive a common voltage signal V com The pixel electrode 111 is configured to receive the pixel driving signal S, and the viewing angle control electrode 21 is configured to receive the viewing angle control signal CFITO in the narrow viewing angle mode; in narrow view mode In the following liquid crystal display device, there are two adjacent refresh frames including the first refresh frame and the second refresh frame, and there are two adjacent pixel electrodes 111 including the first pixel electrode 111' and the second pixel electrode 111", satisfying: a pixel driving signal S in which the first pixel electrode 111' is configured in the first refresh frame 1 And a voltage difference DeltaU of a viewing angle control signal CFITO in which the viewing angle control electrode 21 is arranged 11 A voltage difference DeltaU between the change rule and the pixel driving signal S2 in which the second pixel electrode 111' is arranged and the viewing angle control signal CFITO in which the viewing angle control electrode 21 is arranged in the second refresh frame 22 The change rule is consistent; pixel driving signals S in which the first pixel electrode 111' is configured in the second refresh frame 1 And a voltage difference DeltaU of a viewing angle control signal CFITO in which the viewing angle control electrode 21 is arranged 12 A change rule, a voltage difference Δu from a pixel driving signal S2 in which the second pixel electrode 111″ is arranged and a viewing angle control signal CFITO in which the viewing angle control electrode 21 is arranged in the first refresh frame 21 The change rule is consistent.
It is to be understood that the pixel electrode 111 and the common electrode 12 may be disposed in the same layer or may be disposed in different layers, which is not limited in this embodiment. When the pixel electrode 111 and the common electrode 12 are arranged in the same layer, they are arranged alternately and separately on the side of the first substrate 10 close to the liquid crystal layer 30; when the pixel electrode 111 is disposed on a different layer from the common electrode 12, the pixel electrode 111 may be disposed below the common electrode 12 or above the common electrode 12, which is not limited in this embodiment, fig. 3 exemplarily shows that the pixel electrode 111 is disposed above the common electrode 12, that is, near one side of the liquid crystal layer 30, and an insulating layer is disposed between the pixel electrode 111 and the common electrode 12, but is not limited thereto.
Specifically, the pixel driving signal S is used to supply power to the pixel electrode 111, and the specific voltage is not particularly limited in this embodiment. It will be appreciated that the liquid crystal display device includes a plurality of pixel units 11 arranged in an array, the pixel electrode 111 in each pixel unit 11 is electrically connected to the drain electrode of a Thin Film Transistor (TFT), the source electrode of the TFT is electrically connected to the data line, the gate electrode of the TFT is electrically connected to the scan line, and by applying a sufficient voltage to the scan line, all TFTs electrically connected to the scan line are turned on, so that a signal voltage (i.e., the pixel driving signal S) on the data line can be written into the pixel, and further, an electric field generated between the pixel electrode 111 and the common electrode 12 controls the liquid crystal to deflect, so that light of the backlight module is refracted out to generate a picture. Since the liquid crystal molecules have a certain activity, if a homeotropic voltage is applied to the liquid crystal molecules for a long time, the liquid crystal molecules are polarized, and thus the pixel electrode 111 is generally powered by a inversion driving method,
for example, a row flip mode, a column flip mode, a dot flip mode, or the like. The present embodiment is not limited. For example, the pixel electrodes 111 adopt a column inversion mode, that is, the voltage polarities of the pixel driving signals configured by the pixel electrodes 111 in the pixel units on the same column are the same, and the voltage polarities of the pixel driving signals configured by the adjacent pixel electrodes 111 on the adjacent column are opposite, for example, the first pixel electrode 111 'and the second pixel electrode 111″ are respectively the pixel electrodes of the two adjacent pixel units 11 on the adjacent column, the pixel driving signal of the first pixel electrode 111' is 5V, and the pixel driving signal of the second pixel electrode 111″ is-5V, which is not limited in this embodiment.
Specifically, the viewing angle control signal CFITO is used to supply power to the viewing angle control electrode 21, so that the viewing angle control electrode switches the wide viewing angle mode or the narrow viewing angle mode of the liquid crystal display device, and the specific voltage of the viewing angle control signal CFITO is not particularly limited, for example, 3V. It should be noted that, the viewing angle control signal CFITO configured with the viewing angle control electrode may be a periodically varying signal to avoid polarization of the liquid crystal molecules in the liquid crystal layer 30, and may specifically be a periodically varying square wave signal, an alternating current signal, or a triangular wave signal, which is not limited in particular in the embodiment of the present invention.
Specifically, since a voltage difference exists between the pixel driving signal S and the viewing angle control signal CFITO, an electric field is generated and acts on the liquid crystal layer 30, thereby affecting the inversion of the liquid crystal molecules in the liquid crystal layer 30. By setting the coupling condition of the adjacent two pixels with the viewing angle control electrode in the adjacent two refresh frames to be equivalent and identical, the problem of uneven display caused by the different coupling condition of the adjacent two pixel electrodes 111 with the viewing angle control electrode 21 can be avoided.
Exemplary, referring to FIG. 4, a first pixel driving signal S 1 In the first refresh frame T 1 Is 5V in the second refresh frame T 2 At the time of applying a periodically varying viewing angle control signal CFITO to the viewing angle control electrode 21, and the viewing angle control signal CFITO is changed between-3V and 3V in a flip-flop manner, a first pixel driving signal S 1 In the first refresh frame T 1 The voltage difference between the middle and the visual angle control signal CFITO is delta U 11 When S 1 When cfito=3v, Δu is equal to=5v 11 =2v; when S is 1 When=5v, cfito= -3V, Δu 11 =8v. First pixel driving signal S 1 In the second refresh frame T 2 A voltage difference DeltaU is generated between the middle and the visual angle control signal CFITO 12 When S 1 When = -5V, cfito = 3V, Δu 12 -8V; when S is 1 When = -5V and cfito = -3V, Δu 12 -2V. At the same time, the second pixel driving signal S 2 In the first refresh frame T 1 is-5V, in the second refresh frame T 2 The voltage of (a) is 5V, the first pixel driving signal S 1 In the first refresh frame T 1 The voltage difference between the middle and the visual angle control signal CFITO is delta U 21 When S 2 When = -5V, cfito = 3V, Δu 21 -8V; when S is 2 When = -5V and cfito = -3V, Δu 11 -2V. Second pixel driving signal S 2 In the second refresh frame T 2 The voltage difference between the middle and the visual angle control signal CFITO is delta U 22 When S 2 When cfito=3v, Δu is equal to=5v 21 =2v; when S is 2 When=5v, cfito= -3V, Δu 11 =8v. Thus, deltaU 11 And DeltaU 22 The change rule is consistent, and DeltaU 12 And DeltaU 21 When the change rule is consistent, the first pixel electrode 111' is coupled with the viewing angle control electrode 21 in two adjacent refresh frames, and then acts on the liquid crystal layer 30, and the second pixel electrode 111″ is coupled with the viewing angle control electrode in two adjacent refresh framesThe effect on the liquid crystal layer 30 after 21 coupling is the same, so that the problem of uneven display of the liquid crystal display device can be avoided, the display effect of the liquid crystal display device in the narrow viewing angle mode is improved.
Alternatively, with continued reference to fig. 4, the first pixel electrode 111' is provided with a pixel driving signal S 1 And a pixel driving signal S disposed on the second pixel electrode 111' 2 The sizes are the same, and the polarities are opposite; the pixel driving signal S is in the first refresh frame T 1 And a second refresh frame T 2 Polarity inversion occurs between the two; the polarity of the visual angle control signal CFITO is reversed between two adjacent preset peep-proof periods; the preset time length T of the peep-proof period and the refresh frame time length T meet the following conditions: t=2 n X T, where n is a positive or negative integer.
It is understood that the first pixel electrode 111' and the second pixel electrode 111″ may be two adjacent pixel electrodes in the same row or the same column in the pixel array, which is not limited in this embodiment.
The preset peep preventing period t refers to the time length of the liquid crystal display device applying the visual angle control signal CFITO by the visual angle control electrode 21 in the narrow visual angle mode, and in one preset peep preventing period, a vertical electric field E is generated between the visual angle control electrode 21 and the common electrode 12 and acts on the liquid crystal layer 30, so that the liquid crystal molecules in the liquid crystal layer 30 tilt and tilt along the direction of the electric field E, thereby reducing the display visual angle and realizing narrow visual angle display.
Specifically, the pixel driving signal S disposed on the first pixel electrode 111' is set 1 And a pixel driving signal S disposed on the second pixel electrode 111' 2 The pixel driving signals S are identical in magnitude and opposite in polarity, and the polarities of the pixel driving signals S are inverted between the first refresh frame and the second refresh frame, so that the liquid crystal molecules in the liquid crystal layer 30 are prevented from being polarized by applying the same electric field to the liquid crystal molecules for a long time.
Further, the time length T of the preset peep-proof period and the time length T of the refreshing frame are set to satisfy the following conditions: t=2 n X T, wherein n is a positive integer or a negative integer, can ensure two adjacent images when the polarity of the visual angle control signal CFITO is reversed In the pixel electrodes 111, an electric field formed between the first pixel electrode 111' and the viewing angle control electrode 21 in any one refresh frame is consistent with an electric field formed between the other pixel electrode and the viewing angle control electrode 21 in the next refresh frame, so that the effect of the electric field formed between the two adjacent pixel electrodes 111 and the viewing angle control electrode 21 on the liquid crystal layer 30 in the two adjacent refresh frames is consistent, and the problems of uneven display and flickering of brightness are avoided, so that the display effect is improved.
Optionally, n= -1, 1 or 2, which avoids that the n value is too large to effectively improve the display uniformity of the liquid crystal display device, and simultaneously can avoid that voltages with the same polarity are applied to the viewing angle control electrode for a long time, so that the formed electric field is an electric field in the same direction for a long time, and the polarization of liquid crystal molecules in the liquid crystal layer is caused.
Specifically, when n= -1, the time length T of the preset peep-proof period is 1/2 times of the time length T of the refresh frame, and referring to fig. 4, in one refresh frame, the polarity of the viewing angle control signal CFITO is inverted twice, so as to realize Δu 11 And DeltaU 22 Consistent law of variation and DeltaU 12 And DeltaU 21 When the change rules are consistent, uneven display is avoided.
Fig. 5 is a schematic diagram illustrating an operation timing of another adjacent refresh frame of the lcd device in fig. 3 at a narrow viewing angle, and fig. 5 is a schematic diagram illustrating an operation timing of the lcd device when n=1, in which the time length T of the preset peep-preventing period is 2 times the time length T of the refresh frame, and the first pixel driving signal S 1 In the first refresh frame T 1 In which there is S 1 ＝5V，CFITO＝3V，△U 11 =2v; in the second refresh frame T 2 In which there is S 1 When = -5V, cfito = 3V, Δu 12 -8V. Second pixel driving signal S 2 In the first refresh frame T 1 In which there is S 2 ＝-5V，CFITO＝3V，△U 11 -8V; in the second refresh frame T 2 In which there is S 1 When cfito=3v, Δu is equal to=5v 12 =2v. Thus, deltaU is satisfied 11 ＝△U 22 ，
△U 12 ＝△U 21 The first pixel electrode 111' is shown in the first refresh frame T within a predetermined time period T of the peep-proof period 1 The electric field between the neutralizing viewing angle control electrodes 21 coincides with the electric field between the neutralizing viewing angle control electrodes 21 of the second pixel electrode 111 "in the next refresh frame, while the second pixel electrode 111" is in the first refresh frame T 1 The electric field between the neutralization viewing angle control electrodes 21 is consistent with the electric field between the first pixel electrode 111' and the viewing angle control electrodes 21 in the next refresh frame, so that the coupling condition of the adjacent two pixel electrodes and the viewing angle control electrodes in the adjacent two refresh frames is equivalent and the same, further, the display uniformity can be ensured, the occurrence of flicker and the like can be avoided, and the display effect is improved.
Based on the same analysis, fig. 6 is an exemplary operation timing diagram of another adjacent refresh frame of the lcd device in fig. 3 at a narrow viewing angle, and fig. 6 is an exemplary operation timing diagram of the lcd device when n=2, where the time length T of the preset peep-proof period is 4 times the time length T of the refresh frame, and Δu is satisfied as well 11 ＝△U 22 ，△U 12 ＝△U 21 Namely, the coupling condition of two adjacent pixel electrodes and the visual angle control electrode in two adjacent refresh frames is equivalent and the same, so that the display uniformity can be ensured, the occurrence of flicker and the like is avoided, and the display effect is improved.
Alternatively, fig. 7 is a schematic diagram of a pixel circuit structure of a liquid crystal display device according to an embodiment of the present invention, and fig. 8 is a schematic diagram of a cross-sectional structure of fig. 7, where, as shown in fig. 7 and 8, the first substrate 10 includes a plurality of scan lines 40 and a plurality of data lines 50, and the scan lines 40 and the data lines 50 define pixel units 11 distributed along a plurality of rows and a plurality of columns; the data lines 50 are electrically connected to the pixel electrodes 111 in the plurality of pixel units 11 located in the same column, and the data lines 50 are configured to transmit pixel driving signals S to the pixel electrodes 111, and the polarities of the pixel driving signals S disposed in adjacent two data lines 50 are opposite.
It can be appreciated that the first substrate 10 is defined by a plurality of scan lines 40 intersecting a plurality of data lines 50 to form a plurality of pixel unitsThe pixel units 11 are arranged in an array in a plurality of rows and a plurality of columns. The pixel unit 11 may be a red (R) pixel, a green (G) pixel, or a blue (B) pixel, and a plurality of adjacent pixel units 11 constitute one display pixel, for example, one display pixel may include R, G and B three pixel units. The scan line 40 is defined by G 1 To G 5 By each data line D during progressive scanning 1 ～D 4 The pixel driving signals S are respectively outputted to charge the pixel units 11 in one row connected to the scanning line 40 being scanned, and at this time, the first pixel electrode 111' and the second pixel electrode 111″ may be any two adjacent pixel electrodes in the same row, and the pixel driving signals S are arranged on the data lines connected to the first pixel electrode 111 1 And a pixel driving signal S arranged on a data line connected to the second pixel electrode 111' 2 With opposite polarity, thus avoiding the polarization of the liquid crystal molecules by applying a homeotropic voltage to the liquid crystal molecules for a long period of time.
Optionally, the pixel driving signal S and the viewing angle control signal CFITO are reversed in polarity at least partially in time.
As shown in fig. 4 to 6, when the polarity of the pixel driving signal S or the viewing angle control signal CFITO is reversed, a certain ramp process exists, which can be considered as a rising edge or a falling edge of the pixel driving signal S or the viewing angle control signal CFITO, and during the rising edge or the falling edge of the CFITO, the viewing angle control electrode 21 and the common electrode 12 cannot generate a stable vertical electric field E to deflect the liquid crystal layer 30, so that the pixels of the scanning line at the current moment lose the peep preventing effect, so that the polarity of the pixel driving signal S and the viewing angle control signal CFITO is reversed synchronously at least at part of the moments, so that the viewing angle control signal CFITO and the pixel driving signal S 1 /S 2 The partial polarity inversion moments are aligned, so that the scanning lines caused by partial rising edges or falling edges can be prevented from losing the peep-proof effect.
Optionally, FIG. 9 is a schematic diagram showing the operation timing of another adjacent refresh frame of the LCD device of FIG. 3 at a narrow viewing angle, as shown in FIG. 9, the refresh frame includes a first black insertion sub-stage DeltaT 1 In the followingFirst black inserting sub-stage DeltaT 1 The pixel driving signal configured by the data line 50 is an inactive signal; the stage of polarity inversion of the partial viewing angle control signal CFITO is located in the refresh frame, so that the stage of polarity inversion of the partial viewing angle control signal CFITO is a first inversion stage Deltat 1 First overturning stage Deltat 1 At the first black inserting sub-stage DeltaT 1 Is a kind of medium.
Specifically, as shown in fig. 7 and 9, when the time length T of the preset peep-preventing period of the viewing angle control signal CFITO is 1/2 times of the time length T of the refresh frame, the CFITO will turn over in one refresh frame, and the polarity turning process has a certain delay time, so that the luminance is easy to flash under a large viewing angle, the peep-preventing effect is lost, and the luminance is not uniform, so that the luminance is not uniform, in the first turning stage Δt of the polarity turning of the viewing angle control signal CFITO 1 Simultaneously setting the existence of a first black inserting sub-stage delta T in the refresh frame 1 And causes the first flipping stage Δt 1 At the first black inserting sub-stage DeltaT 1 In order to ensure that when the polarity of the viewing angle control signal CFITO is reversed, the driving signal of the pixel electrode on the line scanned by the scanning line 40 at this time is changed to zero, that is, the pixels on the scanning line are all changed to a dark state, so that the peep-proof effect can be achieved, and meanwhile, the flicker of display brightness is avoided under a large viewing angle, and the display effect is influenced.
Note that, the first black inserting sub-stage Δt 1 And a first flipping stage Δt 1 Voltage difference DeltaU between pixel driving signal S and viewing angle control signal CFITO caused by setting of (2) 11 、△U 12 、△U 21 And DeltaU 22 Will also vary correspondingly and still meet DeltaU 11 And DeltaU 22 The change rule is consistent, and DeltaU 12 And DeltaU 21 The change rule is consistent, and the display uniformity of the liquid crystal display device in a narrow viewing angle mode is improved.
Optionally, with continued reference to fig. 9, the time length Δt of the first black insertion sub-stage 1 At least the time length Deltat of the first inversion time period 1 Twice as large as that, in the view angle control signal CFITO has polarity inversion stage, which can prevent brightness flicker and peeping under large viewing angle, and can not be caused by time length DeltaT of the first black inserting sub-stage 1 Too large, so that the human eye can feel obvious brightness change, and the display effect is affected.
Optionally, fig. 10 is a schematic diagram showing the operation timing sequence of another adjacent refresh frame of the lcd device in fig. 3 at a narrow viewing angle, and as shown in fig. 10, any refresh frame includes a second black insertion sub-stage Δt 2 At the second black inserting sub-stage DeltaT 2 The pixel driving signal S configured by the data line is an inactive signal; at least part of the preset peep-proof period t comprises an invalid phase delta t 2 At the invalidation stage Deltat 2 The viewing angle control signal CFITO is an inactive signal, inactive phase Deltat 2 At the second black inserting sub-stage DeltaT 2 Is a kind of medium.
It will be appreciated that the scan line 40 is defined by G 1 To G 5 Scanned row by row, when the scan line 40 scans to the last row (i.e., G 5 ) When it is necessary to return to the first row (i.e. G 1 ) Continuing the scanning, at this time, due to the secondary G 5 To G 1 There is a delay, called vertical blanking, also called vertical blanking (VBlank), during which bright lines appear on the display screen, affecting the display effect. Alternatively, the first substrate 10 further includes pixel units 11 for non-display, the pixel units 11 being located at the last several rows of the first substrate 10 and being respectively connected to the scanning lines G 6 、G 7 Etc. (not shown in the figure) and the length of time corresponding to the VBlank area increases accordingly. Thus, the second black insertion sub-stage DeltaT is set in any one refresh frame 2 The second black inserting sub-stage DeltaT 2 At the point near the end of the refresh frame, and DeltaT 2 At the beginning of scan line 40 after completion of the active scan line, at a second black insertion sub-stage DeltaT 2 The pixel driving signals S disposed on the data lines 50 are all set to zero, i.e. the pixel driving signals S are invalid signals, so as to prevent obvious bright lines on the display screen from affecting the display uniformity, and at the same time, the viewing angle control signal CFITO is preset for peeping prevention Setting an invalid phase Deltat in a period t 2 And the invalid phase Deltat 2 At the second black inserting sub-stage DeltaT 2 In the invalid phase Deltat 2 In addition, the visual angle control signal CFITO is an invalid signal, so that peeping is prevented, and the phenomenon that the display effect is affected due to incomplete corresponding liquid crystal molecules caused by too large voltage difference change can be avoided.
It should be noted that fig. 10 is only an exemplary illustration of the operation timing of the pixel driving signal S and the viewing angle control signal CFITO when the time length T of the preset peep-proof period is 2 times the time length T of the refresh frame, and may be 1/2 times the time length T of the refresh frame, which has the same advantages.
Optionally, with continued reference to FIG. 10, the invalidation phase Δt 2 The starting time is later than the second black inserting sub-stage DeltaT 2 At this time, the pixel driving signal S is an inactive signal, the display screen is in a black state, and if the voltage (i.e. the viewing angle control signal CFITO) is continuously applied to the viewing angle control electrode 21, the electric field formed between the viewing angle control electrode 21 and the common electrode 12 continuously acts on the liquid crystal layer 30, so that the liquid crystal molecules continuously deflect under the action of the same reverse electric field, and polarization occurs. Thus, the invalidation phase Δt 2 The starting time is later than the second black inserting sub-stage DeltaT 2 The liquid crystal display device can avoid polarization of liquid crystal molecules, and can prevent brightness flicker and peeping at a large viewing angle in the stage of polarity inversion of a viewing angle control signal CFITO, so that the display effect is affected.
Optionally, fig. 11 is a schematic diagram showing an operation timing sequence of another adjacent refresh frame of the lcd device in fig. 3 at a narrow viewing angle, where the preset peep-proof period t includes a buffering phase Δt as shown in fig. 11 3 And an effective phase Δt 4 The method comprises the steps of carrying out a first treatment on the surface of the At the effective stage Deltat 4 The voltage of the viewing angle control signal CFITO is a first voltage V 1 The method comprises the steps of carrying out a first treatment on the surface of the At buffering stage Deltat 3 The voltage of the viewing angle control signal CFITO gradually increases or decreases to a first voltage V 1 。
It will be appreciated that viewing angle control is provided in conjunction with fig. 9 and 10The signal CFITO periodically undergoes polarity inversion, i.e. there is a first inversion phase Deltat 1 Or the view angle control signal CFITO is also provided with an invalidation stage delta t 2 At the first flipping stage Deltat 1 Or an invalidation phase Δt 2 When the voltage of the viewing angle control signal CFITO is set to zero, the first inversion stage Deltat 1 Or an invalidation phase Δt 2 At the end time, if the voltage of the viewing angle control signal CFITO is directly changed into a given voltage signal, the response of the liquid crystal molecules will be not timely and even interference will be generated to other signals due to the large voltage difference change. Thus, FIG. 11 exemplarily shows the operation timings of the pixel driving signal S and the viewing angle control signal CFITO when the time length T of the preset peep-proof period is 2 times the time length T of the refresh frame, wherein the preset peep-proof period T is set to include the buffer phase Deltat 3 And an effective phase Δt 4 . At the effective stage Deltat 4 In this case, the viewing angle control electrode 21 is provided with the viewing angle control signal CFITO having a first voltage V 1 (e.g., 3V) such that the viewing angle control electrode 21 forms an electric field with the common electrode 12 and acts on the liquid crystal layer 30, a narrow viewing angle display of the liquid crystal display device is achieved. At buffering stage Deltat 3 The voltage of the viewing angle control signal CFITO is gradually increased or decreased at the moment when the voltage of the viewing angle control signal CFITO changes, so that the corresponding incompleteness of liquid crystal molecules caused by large voltage difference is avoided, and the interference to other signals is avoided.
Exemplary, referring to FIG. 11, when at the invalidation stage Δt 2 After the end time, the buffer stage delta t is entered 3 The voltage of the viewing angle control signal CFITO starts to gradually increase until the voltage of the viewing angle control signal CFITO is equal to the first voltage V 1 (3V) at this time, the viewing angle control signal CFITO enters an active stage Deltat 4 And displaying at a narrow viewing angle. Similarly, when the polarity of the viewing angle control signal CFITO is reversed, the viewing angle control signal CFITO is deactivated at the inactive stage Deltat 2 After the end time, the buffer phase Deltat is entered again 3 The voltage of the viewing angle control signal CFITO gradually decreases to a first voltage V 1 ’(-3V)。
Further optionally, the buffering phase Δt 3 The time length of (2) is less than or equal to one fourth of the preset peep-proof period t, so that buffer stage Deltat of the CFITO due to the visual angle control signal is avoided 3 The long time affects the narrow viewing angle display of the liquid crystal display device, and avoids the buffer stage Deltat of the viewing angle control signal CFITO 3 The too short time period causes signal interference and incomplete response of the liquid crystal molecules.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method of a liquid crystal display device, for driving the liquid crystal display device in any of the above embodiments, the method including:
in the narrow viewing angle mode, a pixel driving signal is applied to the pixel electrode, and a viewing angle control signal is applied to the viewing angle control electrode, so that in the liquid crystal display device, two adjacent refresh frames including a first refresh frame and a second refresh frame exist, two adjacent pixel electrodes including a first pixel electrode and a second pixel electrode exist, and the following conditions are satisfied: the voltage difference change rule of the pixel driving signal configured by the first pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the first refresh frame is consistent with the voltage difference change rule of the pixel driving signal configured by the second pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the second refresh frame; the voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame is identical to the voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame.
In the embodiment of the invention, in the liquid crystal display device in the narrow viewing angle mode, in two adjacent refresh frames, the voltage difference change rule of the pixel driving signal configured by the first pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the first refresh frame is consistent with the voltage difference change rule of the pixel driving signal configured by the second pixel electrode and the viewing angle control signal configured by the viewing angle control electrode in the second refresh frame, so that the coupling condition of the two adjacent pixel electrodes and the viewing angle control electrode is the same, and the influence on liquid crystal molecules in the liquid crystal layer is the same; the voltage difference change rule of the pixel driving signals configured by the first pixel electrode and the visual angle control signals configured by the visual angle control electrodes in the second refresh frame is consistent with the voltage difference change rule of the pixel driving signals configured by the second pixel electrode and the visual angle control signals configured by the visual angle control electrodes in the first refresh frame, so that the coupling condition of the adjacent two pixel electrodes and the visual angle control electrodes is the same, and meanwhile, the influence on liquid crystal molecules in the liquid crystal layer is the same, and therefore, the coupling condition of the adjacent two pixel electrodes and the visual angle control electrodes in the adjacent two refresh frames is equivalent as the voltage difference change rule in the adjacent two refresh frames, and further, the display unevenness of the liquid crystal display device can be improved, and the polarization of the liquid crystal molecules in the liquid crystal layer is avoided.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements, combinations, and substitutions can be made by those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (12)
1. A liquid crystal display device comprising a first substrate and a second substrate and a liquid crystal layer between the first substrate and the second substrate;
a plurality of pixel units are formed on the first substrate, pixel electrodes are arranged in the pixel units, and a common electrode is also arranged on the first substrate; the second substrate is provided with a visual angle control electrode;
the common electrode is configured to receive a common voltage signal, the pixel electrode is configured to receive a pixel driving signal, and the viewing angle control electrode is configured to receive a viewing angle control signal in a narrow viewing angle mode;
In the liquid crystal display device in the narrow viewing angle mode, there are two adjacent refresh frames including a first refresh frame and a second refresh frame, and there are two adjacent pixel electrodes including a first pixel electrode and a second pixel electrode, satisfying:
a voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame is identical to a voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame;
a voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame is identical to a voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame.
2. The liquid crystal display device according to claim 1, wherein the pixel driving signals arranged on the first pixel electrode and the pixel driving signals arranged on the second pixel electrode are identical in magnitude and opposite in polarity; the pixel driving signal is reversed in polarity between the first refresh frame and the second refresh frame;
The visual angle control signal is subjected to polarity inversion between two adjacent preset peep-proof periods; the time length T of the preset peep-proof period and the time length T of the refreshing frame satisfy the following conditions: t=2 n X T, where n is a positive or negative integer.
3. The liquid crystal display device according to claim 2, wherein the first substrate includes a plurality of scan lines and a plurality of data lines, the scan lines and the data lines defining the pixel cells distributed along a plurality of rows and a plurality of columns;
the data lines are electrically connected with pixel electrodes in a plurality of pixel units positioned in the same column, the data lines are configured to transmit the pixel driving signals to the pixel electrodes, and polarities of the pixel driving signals configured by two adjacent data lines are opposite.
4. The liquid crystal display device according to claim 2, wherein n= -1, 1 or 2.
5. The liquid crystal display device according to claim 2, wherein the pixel driving signal and the viewing angle control signal are polarity-inverted at least partially in synchronization with each other.
6. The liquid crystal display device according to claim 3, wherein the refresh frame includes a first black insertion sub-stage in which the pixel driving signal configured by the data line is an inactive signal;
The stage of polarity inversion of a part of the visual angle control signals is located in the refresh frame, so that the stage of polarity inversion of the part of the visual angle control signals is a first inversion stage, and the first inversion stage is located in the first black inserting sub-stage.
7. The liquid crystal display device of claim 6, wherein the first black insertion sub-stage is at least twice as long as the first inversion stage.
8. The liquid crystal display device according to claim 3, wherein any one of the refresh frames includes a second black insertion sub-stage in which the pixel driving signal configured by the data line is an inactive signal;
at least part of the preset peep-proof period comprises an inactive phase, wherein the visual angle control signal is an inactive signal in the inactive phase, and the inactive phase is located in the second black inserting sub-phase.
9. The liquid crystal display device according to claim 8, wherein the start time of the inactive phase is later than the start time of the second black inserting sub-phase.
10. The liquid crystal display device according to claim 3, wherein the preset peep-proof period includes a buffer stage and an active stage;
In the effective stage, the voltage of the visual angle control signal is a first voltage; in the buffering stage, the voltage of the viewing angle control signal gradually increases or decreases to the first voltage.
11. The liquid crystal display device according to claim 10, wherein the buffer stage has a time length less than or equal to one quarter of the preset privacy cycle.
12. A driving method of a liquid crystal display device, characterized by being used for driving the liquid crystal display device according to any one of claims 1 to 11, comprising:
in the narrow viewing angle mode, pixel driving signals are applied to the pixel electrodes, and simultaneously viewing angle control signals are applied to the viewing angle control electrodes, so that in the liquid crystal display device, two adjacent refresh frames comprise a first refresh frame and a second refresh frame, two adjacent pixel electrodes comprise a first pixel electrode and a second pixel electrode, and the following conditions are satisfied:
a voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame is identical to a voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame;
A voltage difference change rule of the pixel driving signal in which the first pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the second refresh frame is identical to a voltage difference change rule of the pixel driving signal in which the second pixel electrode is arranged and the viewing angle control signal in which the viewing angle control electrode is arranged in the first refresh frame.
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