CN107908027B - Liquid crystal display device having a plurality of pixel electrodes - Google Patents
Liquid crystal display device having a plurality of pixel electrodes Download PDFInfo
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- CN107908027B CN107908027B CN201711279549.9A CN201711279549A CN107908027B CN 107908027 B CN107908027 B CN 107908027B CN 201711279549 A CN201711279549 A CN 201711279549A CN 107908027 B CN107908027 B CN 107908027B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 136
- 239000000758 substrate Substances 0.000 claims abstract description 113
- 125000006850 spacer group Chemical group 0.000 claims description 16
- 230000000007 visual effect Effects 0.000 abstract description 7
- 230000035515 penetration Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 24
- 230000005684 electric field Effects 0.000 description 17
- 230000000737 periodic effect Effects 0.000 description 6
- 210000002858 crystal cell Anatomy 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000005855 radiation Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1323—Arrangements for providing a switchable viewing angle
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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Abstract
A liquid crystal display device comprises a first substrate, a second substrate and a negative liquid crystal layer positioned between the first substrate and the second substrate, wherein a plurality of first switch elements which are arranged in an array mode are arranged on the surface of the first substrate, a common electrode and a first pixel electrode are arranged on each first switch element, and the first pixel electrode is in contact with a first drain electrode of each first switch; the surface of the second substrate is provided with a plurality of second switch elements which are arranged in an array manner, the second switch elements are provided with second pixel electrodes, and the second pixel electrodes are in contact with second drain electrodes of the second switch elements. The invention provides a liquid crystal display device capable of realizing visual angle switching, wherein a first pixel electrode is arranged on a first substrate, a second pixel electrode is arranged on a second substrate, and a data voltage inverted signal which has the same size as a data voltage signal on the corresponding first pixel electrode and has opposite polarity is applied to the second pixel electrode when the visual angle is narrow, so that the penetration rate of the liquid crystal display device is increased when the visual angle is narrow.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a liquid crystal display device.
Background
A Liquid Crystal Display (LCD) has advantages of good picture quality, small size, light weight, low driving voltage, low power consumption, no radiation, and relatively low manufacturing cost, and is dominant in the field of flat panel displays.
With the continuous progress of the liquid crystal display technology, the viewing angle of the display has been widened from about 120 ° to over 160 °, and people want to effectively protect business confidentiality and personal privacy while enjoying visual experience brought by a large viewing angle, so as to avoid business loss or embarrassment caused by the leakage of screen information. There is therefore a need for a display device that can be switched to a narrow viewing angle in addition to a wide viewing angle.
At present, the switching between the wide viewing angle and the narrow viewing angle is generally realized by the shielding function of the shutter, which requires an additional shielding film outside the display device, and is inconvenient to use.
Recently, it has been proposed to apply a vertical electric field to liquid crystal molecules by using a viewing angle control electrode on the color filter substrate (CF) side to switch between a wide viewing angle and a narrow viewing angle. Referring to fig. 1 and 2, the liquid crystal display device includes an upper substrate 62, a lower substrate 61, and a liquid crystal layer 63 disposed between the upper substrate 62 and the lower substrate 61, wherein the upper substrate 62 is provided with a viewing angle control electrode 621, and the lower substrate 61 is provided with a common electrode 611 and a pixel electrode 612. As shown in fig. 1, in the wide viewing angle display, the viewing angle control electrode 621 of the upper substrate 62 does not apply a voltage, and the liquid crystal display device realizes the wide viewing angle display. As shown in fig. 2, when a narrow viewing angle display is required, the viewing angle control electrode 621 of the upper substrate 62 applies a large voltage, the liquid crystal molecules in the liquid crystal layer 63 tilt due to the vertical electric field E (as shown by the arrow in the figure), and the contrast of the liquid crystal display device is reduced due to light leakage, thereby finally realizing a narrow viewing angle. However, the transmittance of the liquid crystal display device is low at a narrow viewing angle.
In order to prevent polarization of liquid crystal molecules, in the narrow viewing angle display of fig. 2, the voltage applied to the viewing angle control electrode 621 is generally an ac voltage. The viewing angle control electrode 621 is a planar electrode on the whole surface, that is, the viewing angle control electrode 621 covers the display area on the whole surface, for the liquid crystal display device, only one row of pixel units is charged at each moment, the rest uncharged pixel units are in a suspension state of charge retention, the voltage change on the viewing angle control electrode 621 causes the pixel voltage in the suspension state to change through capacitive coupling, the voltage difference between the pixel electrode 612 and the common electrode 611 and the viewing angle control electrode 621 changes, the arrangement state of the liquid crystal molecules changes, and the transmittance of the pixel units changes accordingly. At the same time, the difference of the penetration rates of the pixel units at different positions can cause uneven brightness of the display panel; at different times, the display panel flickers due to the difference of the penetration rates of the same pixel unit, and the image quality of the panel is reduced due to the superposition of the difference of the penetration rates in space and time, so that the display panel is prone to display unevenness, flickers and other problems.
In order to solve this problem, in the prior art, the influence of display unevenness caused by optimizing the driving waveform and the driving voltage of the ac voltage applied to the viewing angle control electrode 621 is reduced, but the effect of improving the image quality is limited; alternatively, the flicker of the picture is reduced by doubling the frame frequency of the liquid crystal display device (i.e., increasing the frame frequency from 60Hz to 120Hz), but this increases the logic power consumption, and the time for turning on each scan line is halved, which reduces the pixel charging time and affects the pixel charging effect.
Disclosure of Invention
The invention aims to provide a liquid crystal display device capable of realizing visual angle switching, which aims to solve the problems of low transmittance and uneven brightness of the liquid crystal display device capable of realizing visual angle switching in a narrow visual angle display mode in the prior art.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a liquid crystal display device, which comprises a first substrate, a second substrate arranged opposite to the first substrate and a liquid crystal layer positioned between the first substrate and the second substrate, wherein the liquid crystal layer adopts negative liquid crystal; a plurality of second switch elements, a plurality of second pixel electrodes, a plurality of second data lines and a plurality of second scanning lines are arranged on the second substrate, and each second pixel electrode is connected with the corresponding second data line and the corresponding second scanning line through one second switch element; the plurality of first scan lines and the plurality of second scan lines are for applying scan signals, the plurality of first data lines are for applying data voltage signals, and each of the plurality of second data lines is for applying a bias voltage signal in a wide viewing angle mode or applying a data voltage inversion signal having a polarity opposite to that of the data voltage signal in a narrow viewing angle mode.
Furthermore, a plurality of first pixel units are defined on the first substrate by a plurality of first data lines and a plurality of first scanning lines which are mutually insulated and crossed, and a first switching element and a first pixel electrode are arranged in each first pixel unit; a plurality of second pixel units are defined on the second substrate by a plurality of second data lines and a plurality of second scanning lines which are mutually insulated and crossed, and each second pixel unit is internally provided with a second switching element and a second pixel electrode.
Further, the first switching element includes a first gate electrode, a first source electrode, and a first drain electrode, the first gate electrode is connected to the first scan line, the first source electrode is connected to the first data line, and the first drain electrode is connected to the first pixel electrode; the second switching element includes a second gate electrode connected to the second scan line, a second source electrode connected to the second data line, and a second drain electrode connected to the second pixel electrode.
Further, a signal input terminal of each of the second data lines is connected to one of the selection circuits, and a bias voltage signal is applied to the corresponding second pixel electrode through each of the selection circuits and each of the second data lines in the wide viewing angle mode, and a data voltage inversion signal having a polarity opposite to that of the data voltage signal is applied to the corresponding second pixel electrode through each of the selection circuits and each of the second data lines in the narrow viewing angle mode.
Furthermore, each selection circuit comprises a first control switch and a second control switch, the first control switch comprises a first control end, a first path end and a second path end, the first control end is used for receiving a first control voltage signal, the first path end is used for receiving a data voltage inverted signal, and the second path end is connected with a second data line; the second control switch comprises a second control end, a third path end and a fourth path end, the second control end is used for receiving a second control voltage signal, the third path end is used for receiving a bias voltage signal, and the fourth path end is connected with the second data line.
Further, in the wide viewing angle mode, in the extending direction of the first scan line on the first substrate, the data voltage signals received by two adjacent first pixel electrodes are opposite in polarity, and the bias voltage signals include a first bias signal and a second bias signal with opposite polarities.
Further, in the wide viewing angle mode, in the extending direction of the first scan line on the first substrate, the polarities of the data voltage signals received by two adjacent first pixel electrodes are the same, and the polarities of the bias voltage signals received by two adjacent second pixel electrodes are the same.
The invention also provides a liquid crystal display device, which comprises a first substrate, a second substrate arranged opposite to the first substrate and a liquid crystal layer positioned between the first substrate and the second substrate, wherein the liquid crystal layer adopts negative liquid crystal; a plurality of second pixel electrodes are arranged on the second substrate, a plurality of conductive spacers penetrate through the liquid crystal layer between the first substrate and the second substrate, and each second pixel electrode is connected with the corresponding second data line and the corresponding first scanning line through one conductive spacer and one second switching element; the plurality of first scan lines are for applying scan signals, the plurality of first data lines are for applying data voltage signals, and each of the second data lines is for applying a bias voltage signal in the wide viewing angle mode or a data voltage inversion signal having a polarity opposite to that of the data voltage signal in the narrow viewing angle mode.
Furthermore, each second data line and one first data line are parallel and adjacent to each other, one first data line, one second data line and two first scanning lines are insulated and crossed to define a first pixel unit, and each first pixel unit is internally provided with a first switching element, a second switching element and a first pixel electrode; the first switching element comprises a first grid electrode, a first source electrode and a first drain electrode, wherein the first grid electrode is connected to the first scanning line, the first source electrode is connected to the first data line, and the first drain electrode is connected to the first pixel electrode; the second switching element includes a second gate electrode connected to the first scan line, a second source electrode connected to the second data line, and a second drain electrode connected to the second pixel electrode through the conductive spacer.
Furthermore, a signal input end of each second data line is connected with one selection circuit, a bias voltage signal is applied to the corresponding second pixel electrode through each selection circuit, each second data line and the corresponding conductive spacer in the wide viewing angle mode, and a data voltage inverted signal with the polarity opposite to that of the data voltage signal is respectively applied to the corresponding second pixel electrode through each selection circuit, each second data line and the corresponding conductive spacer in the narrow viewing angle mode.
The invention provides a liquid crystal display device, wherein a plurality of first pixel electrodes are arranged on a first substrate, a plurality of second pixel electrodes are arranged on a second substrate, and a data voltage reverse phase signal which has the same magnitude as a data voltage signal on the corresponding first pixel electrode and has opposite polarity is applied to the second pixel electrodes when the viewing angle is narrow, so that the penetration rate of the liquid crystal display device is increased when the viewing angle is narrow.
Drawings
Fig. 1 is a partial cross-sectional view of a prior art liquid crystal display device at a wide viewing angle.
Fig. 2 is a partial cross-sectional view of a prior art liquid crystal display device at a narrow viewing angle.
FIG. 3 is a partial cross-sectional view of a liquid crystal display device in a narrow viewing angle mode according to a first embodiment of the present invention.
Fig. 4 is a schematic circuit structure diagram of the first substrate of the liquid crystal display device in fig. 3.
Fig. 5 is a schematic circuit structure diagram of the second substrate of the liquid crystal display device in fig. 3.
Fig. 6 is a schematic diagram of a partial circuit structure in fig. 5.
Fig. 7 is a partial cross-sectional view of the liquid crystal display device of fig. 3 in a wide viewing angle mode.
FIG. 8 is a waveform diagram of a bias voltage signal according to a first embodiment of the present invention.
FIG. 9 is a waveform diagram of a bias voltage signal according to a second embodiment of the present invention.
FIG. 10 is a schematic circuit diagram of a second substrate of a liquid crystal display device according to a third embodiment of the present invention.
Fig. 11 is a partial circuit schematic of fig. 10.
FIG. 12 is a waveform diagram of a bias voltage signal according to a third embodiment of the present invention.
Fig. 13 and 14 are waveform diagrams of bias voltage signals according to a fourth embodiment of the present invention.
FIG. 15 is a partial cross-sectional view of a liquid crystal display device in a narrow viewing angle mode according to a fifth embodiment of the present invention.
Fig. 16 is a schematic circuit diagram of the first substrate of the liquid crystal display device in fig. 15.
Fig. 17 is a schematic diagram of a partial circuit structure in fig. 16.
Fig. 18 is a partial cross-sectional view of the liquid crystal display device of fig. 15 in a wide viewing angle mode.
Fig. 19 is a schematic circuit diagram of a first substrate of a liquid crystal display device according to a sixth embodiment of the invention.
Fig. 20 is a schematic diagram of a partial circuit structure in fig. 19.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
[ first embodiment ]
Fig. 3 is a partial cross-sectional view of a liquid crystal display device according to a first embodiment of the invention, fig. 4 is a circuit structure diagram of a first substrate of the liquid crystal display device in fig. 3, and fig. 5 is a circuit structure diagram of a second substrate of the liquid crystal display device in fig. 3. Referring to fig. 3 to 5, the present embodiment provides a liquid crystal display device 100, which includes a first substrate 10, a second substrate 20 disposed opposite to the first substrate 10, and a liquid crystal layer 30 disposed between the first substrate 10 and the second substrate 20.
The liquid crystal layer 30 uses negative liquid crystal, and in an initial state (i.e., a state where no voltage is applied to the liquid crystal display device 100), the negative liquid crystal molecules in the liquid crystal layer 30 have a large initial pretilt angle with respect to the substrates 10 and 20, that is, the negative liquid crystal molecules are in an inclined posture with respect to the substrates 10 and 20 in the initial state.
The first substrate 10 is provided with a plurality of first switching elements 11, a common electrode 12, a plurality of first pixel electrodes 13, a plurality of first data lines 14 and a plurality of first scan lines 15, the plurality of first data lines 14 and the plurality of first scan lines 15 are insulated from each other and crossed to define a plurality of first pixel units P1, each first pixel unit P1 is provided with one first switching element 11 and one first pixel electrode 13, and each first pixel electrode 13 is connected with one corresponding first data line 14 and one corresponding first scan line 15 through one first switching element 11.
Specifically, the first switching element 11 includes a first gate 111, a first source 113, and a first drain 114. The first gate 111 of the first switching element 11 is connected to the first scan line 15, the first source 113 of the first switching element 11 is connected to the first data line 14, and the first drain 114 of the first switching element 11 is connected to the first pixel electrode 13. The first scan lines 15 are for applying scan signals Vscan, the first data lines 14 are for applying data voltage signals Vdata, and for example, the data voltage signals Vdata1, Vdata2, Vdata3, Vdata4, Vdata5, and … … are applied to the plurality of first data lines 14, respectively.
The second substrate 20 is provided with a plurality of second switching elements 21, a plurality of second pixel electrodes 23, a plurality of second data lines 24 and a plurality of second scan lines 25, a plurality of second pixel units P2 are defined by the plurality of second data lines 24 and the plurality of second scan lines 25 being insulated from each other and crossed, one second switching element 21 and one second pixel electrode 23 are provided in each second pixel unit P2, each second pixel electrode 23 is connected with one corresponding second data line 24 and one corresponding second scan line 25 through one second switching element 21, and a signal input terminal of each second data line 24 is connected with one selection circuit 40.
Fig. 6 is a schematic diagram of a partial circuit structure in fig. 5. Referring to fig. 5 and fig. 6, the second switch element 21 includes a second gate 211, a second source 213 and a second drain 214. The second gate electrode 211 of the second switching element 21 is connected to the second scan line 25, the second source electrode 213 of the second switching element 21 is connected to the second data line 24, and the second drain electrode 214 of the second switching element 21 is connected to the second pixel electrode 23. The second scan line 25 is used for applying a scan signal Vscan; one end of the second data line 24 is connected to the selection circuit 40 and is used to apply the bias voltage signal Vbias in the wide view mode or the data voltage inversion signal-Vdata in the narrow view mode.
Specifically, the selection circuit 40 includes a first control switch 41 and a second control switch 42, the first control switch 41 includes a first control terminal a1, a first path terminal b1 and a second path terminal c1, the first control terminal a1 is used for receiving a first control voltage signal V1, the first path terminal b1 is used for receiving a data voltage inversion signal-Vdata, and the second path terminal c1 is connected to the second data line 24; the second control switch 42 includes a second control terminal a2, a third path terminal b2, and a fourth path terminal c2, the second control terminal a2 is for receiving the second control voltage signal V2, the third path terminal b2 is for receiving the bias voltage signal Vbias, and the fourth path terminal c2 is connected to the second data line 24.
The first switching element 11, the second switching element 21, the first control switch 41, and the second control switch 42 are, for example, thin film transistor switches. The first control terminal a1 and the second control terminal a2 are gates, the first pass terminal b1 and the third pass terminal b2 are sources, and the second pass terminal c1 and the fourth pass terminal c2 are drains.
Narrow view angle mode: when the first control voltage signal V1 is at a high level and the second control voltage signal V2 is at a low level, the first control terminal a1 of the first control switch 41 controls the connection between the first pass terminal b1 and the second pass terminal c1 thereof, the second control terminal a2 of the second control switch 42 controls the connection between the third pass terminal b2 thereof and the fourth pass terminal c2 thereof, and each second data line 24 is connected to the first pass terminal b1 of the first control switch 41 through the corresponding selection circuit 40 and receives the data voltage inversion signal-Vdata; when the scan signal Vscan is sequentially transmitted to each of the first scan lines 15 and each of the second scan lines 25 and the high-level scan signal Vscan is received by both the first gate 111 of the first switching element 11 and the second gate 211 of the second switching element 21, the source and drain of the first switching element 11 and the source and drain of the second switching element 21 are turned on, and at this time, the data voltage signal Vdata (i.e., Vdata1, Vdata2, Vdata3, Vdata4, Vdata5, … …) is respectively applied to the corresponding first pixel electrode 13 through each first data line 14, and the data voltage inversion signal-Vdata (i.e., -Vdata1, -Vdata2, -Vdata3, -Vdata4, -Vdata5, … …) is respectively applied to the corresponding second pixel electrode 23 through each selection circuit 40 and each second data line 24, the data voltage inversion signal Vdata and the data voltage signal Vdata have the same magnitude and opposite polarity. At this time, the liquid crystal molecules in the liquid crystal layer 30 have small tilt angle changes and remain in a tilted posture, so that the liquid crystal display device 100 has large-angle observation light leakage, the contrast ratio is reduced in the oblique viewing direction, the viewing angle is narrowed, and the liquid crystal display device 100 realizes narrow viewing angle display.
Wide view angle mode: when the first control voltage signal V1 is at a low level and the second control voltage signal V2 is at a high level, the first control terminal a1 of the first control switch 41 controls the first pass terminal b1 and the second pass terminal c1 to be disconnected, the second control terminal a2 of the second control switch 42 controls the third pass terminal b2 and the fourth pass terminal c2 to be connected, and each second data line 24 is connected to the third pass terminal b2 of the second control switch 42 through the corresponding selection circuit 40 and receives the bias voltage signal Vbias; when the scanning signal Vscan is sequentially transmitted to each of the first scanning lines 15 and each of the second scanning lines 25 and the high-level scanning signal Vscan is received by both the first gate 111 of the first switching element 11 and the second gate 211 of the second switching element 21, the source and drain of the first switching element 11 and the source and drain of the second switching element 21 are all turned on. In this embodiment, the inversion method of the liquid crystal display device is, for example, line inversion or frame inversion, that is, the polarities of the data voltage signals Vdata received by two adjacent first pixel electrodes 13 on the first substrate 10 along the first scan line 15 are the same. At this time, the data voltage signal Vdata (i.e. Vdata1, Vdata2, Vdata3, Vdata4, Vdata5, … …) is applied to the corresponding first pixel electrode 13 through each first data line 14, the bias voltage signal Vbias is uniformly applied to the corresponding second pixel electrode 23 through each selection circuit 40 and each second data line 24, i.e. all the second pixel electrodes 23 are applied with the same polarity of the bias voltage signal Vbias, so that the voltage difference between all the second pixel electrodes 23 and the common electrode 12 is large, a strong vertical electric field E (as shown by an arrow in fig. 7) is generated in the liquid crystal cell between the first substrate 10 and the second substrate 20, and since the negative liquid crystal molecules are deflected in the direction perpendicular to the electric field lines by the electric field, the negative liquid crystal molecules are deflected by the vertical electric field E, so that the tilt angle between the liquid crystal molecules and the substrates 10, 20 is reduced, the liquid crystal display device 100 has the advantages that the large-angle light leakage phenomenon is correspondingly reduced, the contrast ratio in the oblique viewing direction is improved, the viewing angle is increased, and the liquid crystal display device 100 realizes wide viewing angle display.
In the first embodiment, referring to fig. 8, the common voltage applied to the common electrode 12 is a DC common voltage (i.e., DC Vcom), the bias voltage signal Vbias is a periodic ac voltage that fluctuates around the DC Vcom, for example, the DC Vcom is a constant 0V, Vbias is a periodic ac voltage with a magnitude greater than 3V (taking a magnitude of 6V as an example in the figure), and the driving frequency of Vbias can be 1/2 of the frame frequency of the liquid crystal display device 100, that is, within one period T of Vbias, the liquid crystal display device 100 refreshes two frames (frames) of pictures, that is, Vbias switches the polarity once per frame of pictures, but is not limited thereto. The waveform of Vbias may be a square wave, trapezoidal wave, triangular wave, etc. (square wave is exemplified in the figure). At this time, the liquid crystal display device 100 can implement frame inversion.
[ second embodiment ]
FIG. 9 is a waveform diagram of a bias voltage signal according to a second embodiment of the present invention. Referring to fig. 9, in a wide viewing angle, the present embodiment is different from the first embodiment in that the bias voltage signal Vbias is a high-frequency voltage signal, that is, the polarity of the bias voltage signal Vbias is inverted multiple times within one frame (frame), at this time, in the extending direction of the first scan line 15 on the first substrate 10, the polarities of the data voltage signals Vdata received by two adjacent first pixel electrodes 13 are the same, the polarities of the bias voltage signals Vbias received by two corresponding adjacent second pixel electrodes 23 on the second substrate 20 are the same, and the liquid crystal display device 100 can implement row inversion.
[ third embodiment ]
Fig. 10 is a circuit structure diagram of a second substrate of a liquid crystal display device according to a third embodiment of the invention, and fig. 11 is a partial circuit diagram of fig. 10. Referring to fig. 9 and 10, the present embodiment is different from the first embodiment in that the inversion method of the liquid crystal display device 100 in the present embodiment is, for example, column inversion or dot inversion. In the wide viewing angle display, the polarities of the data voltage signals Vdata received by two adjacent first pixel electrodes 13 on the first substrate 10 along the extending direction of the first scan line 15 are opposite; correspondingly, the polarities of the bias voltage signals received by two adjacent second pixel electrodes 23 on the second substrate 20 along the second scan line 25 are opposite. That is, in the present embodiment, the bias voltage signal Vbias includes the first bias signal Vbias1 and the second bias signal Vbias2 that are opposite in polarity.
At this time, data voltage signals Vdata (i.e., Vdata1, Vdata2, Vdata3, Vdata4, Vdata5, … …) are respectively applied to the corresponding first pixel electrodes 13 through the respective first data lines 14, and first and second bias signals Vbias1 and Vbias2 are respectively applied to the adjacent two second pixel electrodes 23 through the respective selection circuits 40 and the respective second data lines 24, i.e., the adjacent two second pixel electrodes 23 are both applied with first and second bias signals Vbias1 and Vbias2 having different polarities, so that a voltage difference between all the second pixel electrodes 23 and the common electrode 12 is large, a strong vertical electric field E (as shown by an arrow in fig. 7) is generated between the first and second substrates 10 and 20 in the liquid crystal cell, and negative liquid crystal molecules are deflected in a direction perpendicular to the electric field line by the negative electric field, the inclination angle between the liquid crystal molecules and the substrates 10 and 20 is reduced, the phenomenon of large-angle light leakage of the liquid crystal display device 100 is correspondingly reduced, the contrast ratio in the oblique viewing direction is improved, the viewing angle is increased, and the liquid crystal display device 100 realizes wide-viewing-angle display.
FIG. 12 is a waveform diagram of a bias voltage signal according to a third embodiment of the present invention. Referring to fig. 8, the common voltage applied to the common electrode 12 is a DC common voltage (i.e., DC Vcom), the first bias signal Vbias1 and the second bias signal Vbias2 are periodic ac voltages that fluctuate around the DC Vcom, for example, the DC Vcom is a constant 0V, Vbias1 and Vbias2 are periodic ac voltages with amplitudes greater than 3V (the amplitude of 6V is taken as an example in the figure), and the driving frequency of Vbias1 and Vbias2 may be 1/2 of the frame frequency of the liquid crystal display device 100, that is, within one period T of Vbias1 and Vbias2, the liquid crystal display device 100 refreshes two frames (frames) of pictures, that is, the polarity of the first bias signal Vbias1 and the second bias signal Vbias2 is switched once per one frame, but not limited thereto. The waveforms of Vbias1 and Vbias2 may be square waves, trapezoidal waves, triangular waves, etc. (square waves are exemplified in the figure). At this time, the liquid crystal display device 100 can realize column inversion.
[ fourth embodiment ]
Fig. 13 and 14 are waveform diagrams of bias voltage signals according to a fourth embodiment of the present invention. Referring to fig. 13 and fig. 14, in a wide viewing angle, the difference between the present embodiment and the third embodiment is that the first bias signal Vbias1 and the second bias signal Vbias2 are high-frequency voltage signals, that is, the polarities of the first bias signal Vbias1 and the second bias signal Vbias2 are inverted multiple times within one frame (frame), at this time, in the extending direction of the first scan line 15 on the first substrate 10, the polarities of the data voltage signals Vdata received by two adjacent first pixel electrodes 13 are different, the polarities of the first bias signal Vbias1 and the second bias signal Vbias received by two corresponding adjacent second pixel electrodes 23 on the second substrate 20 are different, and the liquid crystal display device 100 can implement dot inversion.
[ fifth embodiment ]
Fig. 15 is a partial cross-sectional view of a liquid crystal display device in a narrow viewing angle mode according to a fifth embodiment of the present invention, fig. 16 is a circuit structure diagram of a first substrate of the liquid crystal display device in fig. 15, and fig. 18 is a partial cross-sectional view of the liquid crystal display device in fig. 15 in a wide viewing angle mode. Referring to fig. 15 and 16, the present embodiment provides a liquid crystal display device 100a, which includes a first substrate 10, a second substrate 20 disposed opposite to the first substrate 10, and a liquid crystal layer 30 disposed between the first substrate 10 and the second substrate 20.
The liquid crystal layer 30 uses negative liquid crystal, and in an initial state (i.e., a state where no voltage is applied to the liquid crystal display device 100), the negative liquid crystal molecules in the liquid crystal layer 30 have a large initial pretilt angle with respect to the substrates 10 and 20, that is, the negative liquid crystal molecules are in an inclined posture with respect to the substrates 10 and 20 in the initial state.
The first substrate 10 is provided with a plurality of first switching elements 11, a plurality of second switching elements 21, a common electrode 12, a plurality of first pixel electrodes 13, a plurality of first data lines 14, a plurality of second data lines 24 and a plurality of first scan lines 15, wherein each second data line 24 is parallel to and adjacent to one first data line 14, a first pixel unit P1 is defined by one first data line 14, one second data line 24 and two first scan lines 15 being insulated from each other and crossed, and one first switching element 11, one second switching element 21 and one first pixel electrode 13 are arranged in each first pixel unit P1. Each of the first pixel electrodes 13 is connected to a corresponding one of the first data lines 14 and a corresponding one of the first scan lines 15 through the first switching element 11.
Specifically, the first switching element 11 includes a first gate electrode 111, a first source electrode 113, and a first drain electrode 114, the first gate electrode 111 is connected to the first scan line 15, the first source electrode 113 is connected to the first data line 14, and the first drain electrode 114 is connected to the first pixel electrode 13. The first scan lines 15 are for applying scan signals Vscan, the first data lines 14 are for applying data voltage signals Vdata, and for example, the data voltage signals Vdata1, Vdata2, Vdata3 and … … are applied to the plurality of first data lines 14, respectively.
The second substrate 20 is provided with a plurality of second pixel electrodes 23, and each second pixel electrode 23 is disposed opposite to one first pixel electrode 13 in a vertical direction. A plurality of conductive spacers 50 are disposed between the first substrate 10 and the second substrate 20 and penetrate the liquid crystal layer 30. Each second pixel electrode 23 is connected to a corresponding second data line 24 and a corresponding first scan line 15 through a conductive spacer 50 and a second switching element 21, and a signal input terminal of each second data line 24 is connected to a selection circuit 40.
Fig. 17 is a schematic diagram of a partial circuit structure in fig. 16. Referring to fig. 16 and 17, the second switching element 21 includes a second gate 211, a second source 213 and a second drain 214, the second gate 211 is connected to the first scan line 15, the second source 213 is connected to the second data line 24, and the second drain 214 is connected to the second pixel electrode 23 through a corresponding conductive spacer 50. Wherein one end of the second data line 24 is connected to the selection circuit 40 and is used to apply the bias voltage signal Vbias in the wide view mode or the data voltage inversion signal-Vdata in the narrow view mode. The conductive spacer 50 functions to support the second substrate 20 to maintain a gap between the two substrates 10 and 20, in addition to achieving conductive connection of the second drain electrode 214 of the second switching element 21 to the second pixel electrode 23.
Specifically, the selection circuit 40 includes a first control switch 41 and a second control switch 42, the first control switch 41 includes a first control terminal a1, a first path terminal b1 and a second path terminal c1, the first control terminal a1 is used for receiving a first control voltage signal V1, the first path terminal b1 is used for receiving a data voltage inversion signal-Vdata, and the second path terminal c1 is connected to the second data line 24; the second control switch 42 includes a second control terminal a2, a third path terminal b2, and a fourth path terminal c2, the second control terminal a2 is for receiving the second control voltage signal V2, the third path terminal b2 is for receiving the bias voltage signal Vbias, and the fourth path terminal c2 is connected to the second data line 24.
The first switching element 11, the second switching element 21, the first control switch 41, and the second control switch 42 are, for example, thin film transistor switches. The first control terminal a1 and the second control terminal a2 are gates, the first pass terminal b1 and the third pass terminal b2 are sources, and the second pass terminal c1 and the fourth pass terminal c2 are drains.
Narrow view angle mode: when the first control voltage signal V1 is at a high level and the second control voltage signal V2 is at a low level, the first control terminal a1 of the first control switch 41 controls the connection between the first pass terminal b1 and the second pass terminal c1 thereof, the second control terminal a2 of the second control switch 42 controls the connection between the third pass terminal b2 thereof and the fourth pass terminal c2 thereof, and each second data line 24 is connected to the first pass terminal b1 of the first control switch 41 through the corresponding selection circuit 40 and receives the data voltage inversion signal-Vdata; when the scan signal Vscan is sequentially transmitted to each of the first scan lines 15, and the first gate 111 of the first switching element 11 and the second gate 211 of the second switching element 21 both receive the scan signal Vscan at a high level, the source and drain of the first switching element 11 and the source and drain of the second switching element 21 are both turned on, and at this time, the data voltage signal Vdata (i.e., -Vdata1, Vdata2, Vdata3, … …) is respectively applied to the corresponding first pixel electrode 13 through each of the first data lines 14, and the data voltage inversion signal Vdata (i.e., -Vdata1, -vd 2, -Vdata3, … …) is respectively applied to the corresponding second pixel electrode 23 through each of the selection circuits 40 and each of the second data lines 24 and the corresponding conductive spacer 50, wherein the data voltage inversion signal Vdata has the same magnitude and opposite polarity to the data voltage signal Vdata. At this time, the tilt angle of the liquid crystal molecules in the liquid crystal layer 30 is changed slightly and remains in a tilted state, so that the liquid crystal display device 100a has large-angle observation light leakage, the contrast ratio is reduced in the oblique direction and the viewing angle is narrowed, and the liquid crystal display device 100a realizes narrow-viewing-angle display.
Wide view angle mode: when the first control voltage signal V1 is at a low level and the second control voltage signal V2 is at a high level, the first control terminal a1 of the first control switch 41 controls the first pass terminal b1 and the second pass terminal c1 to be disconnected, the second control terminal a2 of the second control switch 42 controls the third pass terminal b2 and the fourth pass terminal c2 to be connected, and each second data line 24 is connected to the third pass terminal b2 of the second control switch 42 through the corresponding selection circuit 40 and receives the bias voltage signal Vbias; when the scan signal Vscan is sequentially transmitted to each of the first scan lines 15 and the high-level scan signal Vscan is received by both the first gate 111 of the first switching element 11 and the second gate 211 of the second switching element 21, the source and drain of the first switching element 11 and the source and drain of the second switching element 21 are all turned on. In this embodiment, the liquid crystal display device is inverted in a row inversion or frame inversion manner, for example, in a direction along the first scan line 15 on the first substrate 10, the polarities of the data voltage signals Vdata received by two adjacent first pixel electrodes 13 are the same, at this time, the data voltage signals Vdata (i.e. Vdata1, Vdata2, Vdata3, … …) are respectively applied to the corresponding first pixel electrodes 13 through the respective first data lines 14, the bias voltage signal Vbias is uniformly applied to the corresponding second pixel electrodes 23 through the respective selection circuits 40, the respective second data lines 24 and the corresponding conductive spacers 50, i.e. the bias voltage signal Vbias with the same polarity is uniformly applied to all the second pixel electrodes 23, so that the voltage difference between all the second pixel electrodes 23 and the common electrode 12 is large, and a strong vertical electric field E is generated between the first substrate 10 and the second substrate 20 in the liquid crystal cell (as shown by an arrow mark in fig. 12), since the negative liquid crystal molecules are deflected along the direction perpendicular to the electric field lines under the action of the electric field, the negative liquid crystal molecules are deflected under the action of the vertical electric field E, so that the inclination angle between the liquid crystal molecules and the substrates 10 and 20 is reduced, the phenomenon of light leakage at a large angle of the liquid crystal display device 100a is correspondingly reduced, the contrast in the oblique viewing direction is improved, the viewing angle is increased, and the liquid crystal display device 100a realizes wide-viewing-angle display.
In other embodiments, when the inversion method of the liquid crystal display device 100a is, for example, column inversion or dot inversion, that is, in the direction along the first scan line 15 on the first substrate 10, the polarities of the data voltage signals Vdata received by two adjacent first pixel electrodes 13 are opposite, that is, in the direction along the second scan line 25 on the second substrate 20, the polarities of the data voltage signals Vdata received by two adjacent second pixel electrodes 23 are opposite. At this time, in the wide viewing angle mode, the bias voltage signals applied to the adjacent two second pixel electrodes 23 are opposite in polarity; in the narrow viewing angle mode, the data voltage inversion signal Vdata applied to each second pixel electrode 23 is opposite in polarity to the data voltage signal Vdata applied to the corresponding each first pixel electrode 13.
In an embodiment, referring to fig. 8, the common voltage applied to the common electrode 12 is a DC common voltage (i.e., DC Vcom), the bias voltage signal Vbias is a periodic ac voltage that fluctuates around the DC Vcom, for example, the DC Vcom is a constant 0V, Vbias is a periodic ac voltage with a magnitude greater than 3V (taking a magnitude of 6V as an example in the figure), and the driving frequency of Vbias can be 1/2 of the frame frequency of the liquid crystal display device 100, that is, within one period T of Vbias, the liquid crystal display device 100 refreshes two frames (frames) of pictures, that is, Vbias switches the polarity once per frame of pictures, but is not limited thereto. The waveform of Vbias may be a square wave, trapezoidal wave, triangular wave, etc. (square wave is exemplified in the figure).
[ sixth embodiment ]
Fig. 19 is a schematic circuit diagram of a first substrate of a liquid crystal display device according to a sixth embodiment of the invention, and fig. 20 is a schematic partial circuit diagram of fig. 19. Referring to fig. 19 and fig. 20, the present embodiment is different from the fifth embodiment in that in the present embodiment, the inversion method of the liquid crystal display device 100 is, for example, column inversion or dot inversion. In the wide viewing angle display, the polarities of the data voltage signals Vdata received by two adjacent first pixel electrodes 13 on the first substrate 10 along the extending direction of the first scan line 15 are opposite; correspondingly, the polarities of the bias voltage signals received by two adjacent second pixel electrodes 23 on the second substrate 20 along the second scan line 25 are opposite. That is, in the present embodiment, the bias voltage signal Vbias includes the first bias signal Vbias1 and the second bias signal Vbias2 that are opposite in polarity.
At this time, data voltage signals Vdata (i.e., Vdata1, Vdata2, Vdata3, Vdata4, Vdata5, … …) are respectively applied to the corresponding first pixel electrodes 13 through the respective first data lines 14, and first and second bias signals Vbias1 and Vbias2 are respectively applied to the adjacent two second pixel electrodes 23 through the respective selection circuits 40 and the respective second data lines 24, i.e., the adjacent two second pixel electrodes 23 are both applied with first and second bias signals Vbias1 and Vbias2 having different polarities, so that a voltage difference between all the second pixel electrodes 23 and the common electrode 12 is large, a strong vertical electric field is generated between the first and second substrates 10 and 20 in the liquid crystal cell, and negative liquid crystal molecules are deflected in a direction perpendicular to the electric field lines by the electric field, and thus the negative liquid crystal molecules are deflected by the vertical electric field E, and the tilt angle between the liquid crystal molecules and the two substrates is reduced, the liquid crystal display device 100a has the advantages that the large-angle light leakage phenomenon is correspondingly reduced, the contrast ratio in the oblique viewing direction is improved, the viewing angle is increased, and the liquid crystal display device 100a realizes wide viewing angle display.
In the liquid crystal display devices 100 and 100a according to the embodiments of the present invention, the first pixel electrode 13 is disposed on the first substrate 10, the second pixel electrode 23 is disposed on the second substrate 20, and the data voltage inversion signal-Vdata having the same magnitude and opposite polarity as the data voltage signal Vdata on the first pixel electrode 13 is applied to the second pixel electrode 23 at the narrow viewing angle, so as to increase the transmittance of the liquid crystal display devices 100 and 100a at the narrow viewing angle and solve the problem of uneven brightness and darkness of the liquid crystal display devices 100 and 100a during displaying.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
In this document, the terms front, back, upper and lower are used to define the components in the drawings and the positions of the components relative to each other, and are used for clarity and convenience of the technical solution. It is to be understood that the use of the directional terms should not be taken to limit the scope of the claims.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A liquid crystal display device (100) comprises a first substrate (10), a second substrate (20) arranged opposite to the first substrate (10), and a liquid crystal layer (30) positioned between the first substrate (10) and the second substrate (20), wherein the liquid crystal layer (30) adopts negative liquid crystal, a plurality of first switch elements (11), a common electrode (12), a plurality of first pixel electrodes (13), a plurality of first data lines (14) and a plurality of first scanning lines (15) are arranged on the first substrate (10), and each first pixel electrode (13) is connected with the corresponding first data line (14) and the corresponding first scanning line (15) through one first switch element (11); a plurality of second switching elements (21), a plurality of second pixel electrodes (23), a plurality of second data lines (24) and a plurality of second scanning lines (25) are arranged on the second substrate (20), and each second pixel electrode (23) is connected with the corresponding second data line (24) and the corresponding second scanning line (25) through one second switching element (21); the plurality of first scan lines (15) and the plurality of second scan lines (25) are for applying a scan signal (Vscan), the plurality of first data lines (14) are for applying a data voltage signal (Vdata), and each second data line (24) is for applying a bias voltage signal (Vbias) in a wide viewing angle mode or a data voltage inversion signal (-Vdata) having a polarity opposite to that of the data voltage signal (Vdata) in a narrow viewing angle mode.
2. The liquid crystal display device (100) according to claim 1, wherein the first substrate (10) has a plurality of first pixel cells (P1) defined thereon by the plurality of first data lines (14) and the plurality of first scan lines (15) being insulated from each other and crossing each other, one of the first switching elements (11) and one of the first pixel electrodes (13) being provided in each of the first pixel cells (P1); the second substrate (20) is defined by a plurality of second data lines (24) and a plurality of second scanning lines (25) which are insulated and crossed with each other to form a plurality of second pixel units (P2), and one second switching element (21) and one second pixel electrode (23) are arranged in each second pixel unit (P2).
3. The liquid crystal display device (100) according to claim 2, wherein the first switching element (11) comprises a first gate electrode (111), a first source electrode (113), and a first drain electrode (114), the first gate electrode (111) is connected to the first scanning line (15), the first source electrode (113) is connected to the first data line (14), and the first drain electrode (114) is connected to the first pixel electrode (13); the second switching element (21) includes a second gate electrode (211), a second source electrode (213), and a second drain electrode (214), the second gate electrode (211) is connected to the second scan line (25), the second source electrode (213) is connected to the second data line (24), and the second drain electrode (214) is connected to the second pixel electrode (23).
4. The liquid crystal display device (100) according to claim 1, wherein a signal input terminal of each second data line (24) is connected to one selection circuit (40), the bias voltage signal (Vbias) is applied to the corresponding second pixel electrode (23) through each selection circuit (40) and each second data line (24) in the wide viewing angle mode, and the data voltage inversion signal (-Vdata) having a polarity opposite to that of the data voltage signal (Vdata) is applied to the corresponding second pixel electrode (23) through each selection circuit (40) and each second data line (24) in the narrow viewing angle mode.
5. The liquid crystal display device (100) of claim 4, wherein each selection circuit (40) comprises a first control switch (41) and a second control switch (42), the first control switch (41) comprising a first control terminal (a1), a first pass terminal (b1) and a second pass terminal (c1), the first control terminal (a1) being configured to receive a first control voltage signal (V1), the first pass terminal (b1) being configured to receive the data voltage inversion signal (-Vdata), the second pass terminal (c1) being coupled to the second data line (24); the second control switch (42) comprises a second control terminal (a2), a third pass terminal (b2) and a fourth pass terminal (c2), the second control terminal (a2) is configured to receive a second control voltage signal (V2), the third pass terminal (b2) is configured to receive a bias voltage signal (Vbias), and the fourth pass terminal (c2) is connected to the second data line (24).
6. The liquid crystal display device (100) according to claim 5, wherein in the wide viewing angle mode, data voltage signals (Vdata) received by adjacent two of the first pixel electrodes (13) on the first substrate (10) along the extending direction of the first scan line (15) are opposite in polarity, and the bias voltage signal (Vbias) comprises a first bias signal (Vbias1) and a second bias signal (Vbias2) which are opposite in polarity.
7. The liquid crystal display device (100) according to claim 5, wherein in the wide viewing angle mode, the data voltage signal (Vdata) received by two adjacent first pixel electrodes (13) has the same polarity, and the bias voltage signal (Vbias) received by two adjacent second pixel electrodes (23) has the same polarity, in the extending direction of the first scan line (15) on the first substrate (10).
8. A liquid crystal display device (100a) comprises a first substrate (10), a second substrate (20) arranged opposite to the first substrate (10), and a liquid crystal layer (30) positioned between the first substrate (10) and the second substrate (20), wherein the liquid crystal layer (30) adopts negative liquid crystal, a plurality of first switching elements (11), a plurality of second switching elements (21), a common electrode (12), a plurality of first pixel electrodes (13), a plurality of first data lines (14), a plurality of second data lines (24) and a plurality of first scanning lines (15) are arranged on the first substrate (10), and each first pixel electrode (13) is connected with the corresponding first data line (14) and the corresponding first scanning line (15) through one first switching element (11); a plurality of second pixel electrodes (23) are arranged on the second substrate (20), a plurality of conductive spacers (50) are arranged between the first substrate (10) and the second substrate (20) and penetrate through the liquid crystal layer (30), and each second pixel electrode (23) is connected with the corresponding second data line (24) and the corresponding first scanning line (15) through one conductive spacer (50) and one second switching element (21); the plurality of first scan lines (15) are for applying a scan signal (Vscan), the plurality of first data lines (14) are for applying a data voltage signal (Vdata), and each second data line (24) is for applying a bias voltage signal (Vbias) in a wide view angle mode or a data voltage inversion signal (-Vdata) having a polarity opposite to that of the data voltage signal (Vdata) in a narrow view angle mode.
9. The liquid crystal display device (100a) according to claim 8, wherein each of the second data lines (24) is disposed parallel to and adjacent to one of the first data lines (14), a first pixel unit (P1) is defined by one of the first data lines (14) and one of the second data lines (24) and two of the first scan lines (15) crossing each other in an insulated manner, and each of the first pixel units (P1) has one of the first switching elements (11), one of the second switching elements (21) and one of the first pixel electrodes (13) disposed therein; the first switching element (11) includes a first gate electrode (111), a first source electrode (113), and a first drain electrode (114), the first gate electrode (111) is connected to the first scanning line (15), the first source electrode (113) is connected to the first data line (14), and the first drain electrode (114) is connected to the first pixel electrode (13); the second switching element (21) includes a second gate electrode (211), a second source electrode (213), and a second drain electrode (214), the second gate electrode (211) is connected to the first scan line (15), the second source electrode (213) is connected to the second data line (24), and the second drain electrode (214) is connected to the second pixel electrode (23) through the conductive spacer (50).
10. The liquid crystal display device (100a) according to claim 9, wherein a signal input terminal of each second data line (24) is connected to one selection circuit (40), the bias voltage signal (Vbias) is applied to the corresponding second pixel electrode (23) through each selection circuit (40) and each second data line (24) and the corresponding conductive spacer (50) in the wide viewing angle mode, and the data voltage inversion signal (-Vdata) having a polarity opposite to that of the data voltage signal (Vdata) is applied to the corresponding second pixel electrode (23) through each selection circuit (40) and each second data line (24) and the corresponding conductive spacer (50) in the narrow viewing angle mode.
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