CN110673406A - Liquid crystal display panel with switchable viewing angle and driving method thereof - Google Patents
Liquid crystal display panel with switchable viewing angle and driving method thereof Download PDFInfo
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- CN110673406A CN110673406A CN201910877906.4A CN201910877906A CN110673406A CN 110673406 A CN110673406 A CN 110673406A CN 201910877906 A CN201910877906 A CN 201910877906A CN 110673406 A CN110673406 A CN 110673406A
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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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- 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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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
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Abstract
A plurality of sub-pixels which are arranged in an array mode are formed on a first substrate of the liquid crystal display panel, a pixel electrode is arranged in each sub-pixel, the pixel electrode in each sub-pixel comprises a first pixel electrode portion, the first pixel electrode portion comprises a plurality of first pixel electrode strips which are electrically connected together, and the inclination angles of the first pixel electrode strips are different. According to the liquid crystal display panel with the switchable visual angles, the plurality of sub-pixels which are arranged in an array mode are formed on the first substrate, the first pixel electrode strips with different inclination angles are arranged in each sub-pixel, so that each sub-pixel is divided into a plurality of areas, horizontal electric fields for driving liquid crystal molecules to rotate in a horizontal plane in each area are different, and therefore oblique light leakage of the liquid crystal display panel in a large visual angle mode in a narrow visual angle mode can be reduced, and a gray scale inversion phenomenon in the narrow visual angle mode is improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a liquid crystal display panel with switchable viewing angles and a driving method thereof.
Background
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.
The current display device gradually develops towards the direction of wide viewing angle, and no matter the application of mobile phone terminal, desktop display or notebook computer, besides the requirement of wide viewing angle, in many occasions, the display device is also required to have the function of switching between wide viewing angle and narrow viewing angle.
When the conventional liquid crystal display panel with switchable viewing angles displays at a narrow viewing angle, the conventional liquid crystal display panel is provided with a vertical electric field in addition to a horizontal electric field for driving liquid crystal molecules to rotate in a horizontal plane, so that part of the liquid crystal molecules are tilted, the contrast of the liquid crystal display device is reduced due to light leakage, and the narrow viewing angle (peep-proof mode) is finally realized.
In the prior art, horizontal electric fields for driving liquid crystal molecules to rotate in a horizontal plane in each sub-pixel are equal, taking fig. 1 as an example, and fig. 1 is a schematic structural diagram of a pixel electrode in the prior art. Referring to fig. 1, in the prior art, a pixel electrode 40 generally includes two electrode portions that are symmetrical and electrically connected, and each electrode portion includes a plurality of pixel electrode bars 41 that are parallel to each other.
In the prior art, all liquid crystal display panels with switchable viewing angles have the problem that gray scale inversion occurs in a peep-proof mode under a large viewing angle, and particularly under a picture with a relatively large contrast ratio (for example, a text section with a black and white tone), due to the existence of gray scale inversion, the peep-proof effect is affected by the gray scale inversion at the large viewing angle, so that the taste of the peep-proof mode is reduced, and even the peep-proof effect is affected (the content can still be identified in the picture after the gray scale inversion). How to improve the gray scale inversion of the lcd device under the large viewing angle in the privacy mode has become a problem to be solved.
Disclosure of Invention
The invention aims to provide a liquid crystal display device to solve the problem of gray scale inversion under a large visual angle when the conventional liquid crystal display device is under a narrow visual angle.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a liquid crystal display panel with switchable visual angles, which comprises a first substrate, a second substrate and a liquid crystal layer clamped between the first substrate and the second substrate, wherein a common electrode is arranged on the first substrate, a visual angle control electrode is arranged on the second substrate, a plurality of sub-pixels which are arranged in an array form are formed on the first substrate, a pixel electrode is arranged in each sub-pixel, the pixel electrode in each sub-pixel comprises a first pixel electrode part, the first pixel electrode part comprises a plurality of first pixel electrode strips which are electrically connected together, and the inclination angles of the first pixel electrode strips are different.
Further, the alignment direction of liquid crystal molecules in the liquid crystal layer (30) includes a first direction (a), the arrangement direction of first pixel electrode strips (112) in the sub-pixel (101) includes a second direction (B), from the middle to two sides in the first sub-pixel (101), the included angle between the second direction (B) of the first pixel electrode strips (112) and the first direction (a) of the liquid crystal molecules is gradually increased, and the included angles between two adjacent first pixel electrode strips (112) in the plurality of first pixel electrode strips (112) are all equal.
Further, an included angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 42 °, and an included angle between two adjacent first pixel electrode strips (112) in the plurality of first pixel electrode strips (112) is 7 °.
Further, an included angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 28 °, and an included angle between two adjacent first pixel electrode strips (112) in the plurality of first pixel electrode strips (112) is 7 °.
Further, an included angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 24 °, and an included angle between two adjacent first pixel electrode strips (112) in the plurality of first pixel electrode strips (112) is 6 °.
Further, an included angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 20 °, and an included angle between two adjacent first pixel electrode strips (112) in the plurality of first pixel electrode strips (112) is 5 °.
Further, an included angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 14 °, and an included angle between two adjacent first pixel electrode strips (112) in the plurality of first pixel electrode strips (112) is 7 °.
Further, the pixel electrode (11) in each sub-pixel (101) comprises a second pixel electrode portion (114) electrically connected with the first pixel electrode portion (111), the second pixel electrode portion (114) is in mirror symmetry with the first pixel electrode portion (111), and the second pixel electrode portion (114) comprises a plurality of second pixel electrode strips (115) with different inclination angles.
The invention also provides a driving method of the liquid crystal display panel with switchable visual angles, which comprises the following steps:
in a wide viewing angle mode, applying a reference common voltage to a common electrode on a first substrate, and applying a first voltage signal having a smaller voltage difference with respect to the reference common voltage to a viewing angle control electrode on a second substrate, so that the voltage difference between the common electrode and the viewing angle control electrode is smaller than a preset value;
in the narrow viewing angle mode, a reference common voltage is applied to the common electrode on the first substrate, and a second voltage signal having a large voltage difference with respect to the reference common voltage is applied to the viewing angle control electrode on the second substrate, so that the voltage difference between the common electrode and the viewing angle control electrode is greater than a preset value.
Further, in the wide viewing angle mode, the first voltage signal applied to the viewing angle control electrode is the same as the reference common voltage applied to the common electrode, so that a voltage difference between the common electrode and the viewing angle control electrode is zero; in the narrow viewing angle mode, the second voltage signal applied to the viewing angle control electrode is an alternating voltage, so that the voltage difference between the common electrode and the viewing angle control electrode is greater than or equal to 3V.
The invention provides a liquid crystal display panel with switchable visual angles, which is characterized in that a plurality of sub-pixels arranged in an array mode are formed on a first substrate, a pixel electrode comprising a first pixel electrode part is arranged in each sub-pixel, the first pixel electrode part comprises a plurality of first pixel electrode strips with different inclination angles, so that each sub-pixel is divided into a plurality of areas, and horizontal electric fields for driving liquid crystal molecules to rotate in a horizontal plane in each area are different, so that the oblique light leakage of the liquid crystal display panel with large visual angles in a narrow visual angle mode can be reduced, and the gray scale inversion phenomenon in the narrow visual angle mode can be improved.
Drawings
Fig. 1 is a schematic structural diagram of a pixel electrode in a subpixel in the prior art.
Fig. 2 is a schematic cross-sectional view of a liquid crystal display panel according to a first embodiment of the invention.
FIG. 3 is a schematic plan view of a sub-pixel according to a first embodiment of the present invention.
FIG. 4 is a graph illustrating transmittance of white and black states of a liquid crystal display panel according to a first embodiment of the present invention and in the prior art.
FIG. 5 is a graph illustrating contrast ratios of the first embodiment of the present invention and the prior art LCD panel in the X-axis direction.
FIG. 6 is a schematic plan view of a sub-pixel according to a second embodiment of the present invention.
FIG. 7 is a schematic plan view of a sub-pixel according to a third embodiment of the present invention.
FIG. 8 is a schematic plan view of a sub-pixel according to a fourth embodiment of the present invention.
FIG. 9 is a schematic plan view of a sub-pixel in a fifth embodiment of the present invention
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. 2 is a schematic cross-sectional view of a liquid crystal display panel according to a first embodiment of the invention, and fig. 3 is a schematic plan view of a sub-pixel according to the first embodiment of the invention. Referring to fig. 2 and fig. 3, an embodiment of the invention provides a liquid crystal display panel with switchable viewing angles, where the liquid crystal display panel includes a first substrate 10, a second substrate 20, and a liquid crystal layer interposed between the first substrate 10 and the second substrate 20, a common electrode 12 and a pixel electrode 11 are disposed on the first substrate 10, a viewing angle control electrode 21 is disposed on the second substrate 20, a plurality of sub-pixels 101 arranged in an array are formed on the first substrate 10, the pixel electrode 11 is disposed in each sub-pixel 101, the pixel electrode 11 in each sub-pixel 101 includes a first pixel electrode portion 111, the first pixel electrode portion 111 includes a plurality of first pixel electrode bars 112 electrically connected together, and inclination angles of the plurality of first pixel electrode bars 112 are different.
Referring to fig. 3, the included angles between two adjacent first pixel electrode stripes 112 in the plurality of first pixel electrode stripes 112 are all equal. Specifically, in the present embodiment, the alignment direction of the liquid crystal molecules in the liquid crystal layer 30 includes a first direction a, the arrangement direction of the first pixel electrode bars 112 in the sub-pixels 101 includes a second direction B, and an included angle between the second direction B of the first pixel electrode bars 112 and the first direction a gradually increases from the middle to two sides in the sub-pixels 101.
Referring to fig. 3, in the present embodiment, the first direction a of the liquid crystal molecules in the sub-pixel 101 is taken as a positive direction of the Y-axis, the direction parallel to and opposite to the first direction a is taken as a negative direction of the Y-axis, two directions perpendicular to the first direction a are respectively the positive direction of the X-axis and the negative direction of the X-axis, and the first direction a of the liquid crystal molecules in each sub-pixel is taken as a reference direction (the first direction is 0 °), and each first pixel electrode bar 112 in the sub-pixel 101 forms an included angle with the alignment of the liquid crystal molecules. The inclination angle of the first pixel electrode bar 112 in the middle of each sub-pixel 101 is 0 °, and the included angle between the arrangement direction B1 and the first direction a is 0 °; the inclination angle (-24 °) of the leftmost first pixel electrode stripe 112 in each sub-pixel 101 is the smallest, and the arrangement direction B2 forms an angle of-24 ° with the first direction a; the rightmost first pixel electrode bar 112 in each sub-pixel 101 has the largest inclination angle (24 °), and the arrangement direction B3 has an angle of 24 ° with the first direction a. In addition, the included angle between two adjacent first pixel electrode strips 112 in each sub-pixel 101 is equal, and the included angle is 6 °.
In this embodiment, the arrangement directions of the plurality of first pixel electrode bars 112 in each sub-pixel 101 are different, so that the horizontal electric fields formed between the first pixel electrode bars 112 and the common electrode 12 in each sub-pixel 101 for driving the liquid crystal molecules to rotate in the horizontal plane are different, and each sub-pixel 101 is divided into a plurality of regions with different horizontal electric fields by the plurality of first pixel electrode bars 112. Then, in each sub-pixel 101, the angle of deflection of the liquid crystal molecules gradually increases from the middle to both sides. Therefore, in a narrow viewing angle, the light leakage degree of the liquid crystal display panel is more uniform along with the increase of the viewing angle, so that the problem of gray scale inversion under a large viewing angle can be solved.
Please refer to fig. 4, in which a curve ① is a graph illustrating transmittance of the liquid crystal display panel in the black state along the X-axis direction in the narrow viewing angle mode, a curve ② is a graph illustrating transmittance of the liquid crystal display panel in the black state along the X-axis direction in the narrow viewing angle mode, a curve ③ is a graph illustrating transmittance of the liquid crystal display panel in the white state along the X-axis direction in the narrow viewing angle mode, and a curve ④ is a graph illustrating transmittance of the liquid crystal display panel in the white state along the X-axis direction in the narrow viewing angle mode in the prior art, as can be seen from curves ① to ④, when the liquid crystal display panel is switched to the narrow viewing angle mode, the transmittance of the liquid crystal display panel in the embodiment is improved compared to the prior art.
Table 1 shows the transmittance and contrast ratio data of the lcd panel in the black and white states according to the prior art and the first embodiment of the present invention. Referring to fig. 1, fig. 4 and table 1, compared with the prior art, when the lcd panel is switched to the narrow viewing angle mode, the privacy angle of the structure of the present embodiment is 30-70 °, which is 10 ° larger than the privacy angle of the original structure, 35-65 °, but the central contrast ratio of the structure is only 4.5% lower than that of the original structure. Therefore, the peep-proof angle of the structure proposed in this embodiment in the narrow viewing angle mode is increased compared to the original structure.
TABLE 1
Fig. 5 is a schematic diagram of a contrast curve of a liquid crystal display panel in the first embodiment of the present invention and the prior art in the X-axis direction, and table 1 is a central contrast curve of the liquid crystal display panel in the embodiment of the present invention and the prior art in the narrow viewing angle, please refer to fig. 5 and table 1, where a curve ⑤ is a schematic diagram of a contrast ratio of a liquid crystal display panel in the prior art in the X-axis direction in the narrow viewing angle mode, a curve ⑥ is a schematic diagram of a contrast ratio of a liquid crystal display panel in the prior art in the X-axis direction in the narrow viewing angle mode, and it can be known from curves ⑤ and ⑥ that the contrast curve of the architecture proposed in this embodiment is narrower than the original architecture, and a better anti-peep effect can be achieved.
[ second embodiment ]
FIG. 6 is a schematic plan view of a sub-pixel according to a second embodiment of the present invention. Referring to fig. 6, in the present embodiment, the first direction a of the liquid crystal molecules in the sub-pixel 101 is taken as a positive direction of the Y-axis, the direction parallel to and opposite to the first direction a is taken as a negative direction of the Y-axis, two directions perpendicular to the first direction a are respectively the positive direction of the X-axis and the negative direction of the X-axis, and the first direction a of the liquid crystal molecules in each sub-pixel 101 is taken as a reference direction (the first direction is 0 °), and each first pixel electrode bar 112 in the sub-pixel 101 forms an angle with the alignment of the liquid crystal molecules. The inclination angle of the first pixel electrode bar 112 in the middle of each sub-pixel 101 is 0 °, and the included angle between the arrangement direction B1 and the first direction a is 0 °; the inclination angle (-20 °) of the leftmost first pixel electrode stripe 112 in each sub-pixel 101 is the smallest, and the arrangement direction B2 forms an angle of 20 ° with the first direction a; the rightmost first pixel electrode bar 112 in each sub-pixel 101 has the largest inclination angle (20 °), and the arrangement direction B3 has an angle of 20 ° with the first direction a. In addition, the included angle between two adjacent first pixel electrode strips 112 in each sub-pixel 101 is equal, and the included angle is 5 °.
In this embodiment, the arrangement directions of the plurality of first pixel electrode bars 112 in each sub-pixel 101 are different, so that the horizontal electric fields formed between the first pixel electrode bars 112 and the common electrode 12 in each sub-pixel 101 for driving the liquid crystal molecules to rotate in the horizontal plane are different, and each sub-pixel 101 is divided into a plurality of regions with different horizontal electric fields by the plurality of first pixel electrode bars 112. Then, in each sub-pixel 101, the angle of deflection of the liquid crystal molecules gradually increases from the middle to both sides. Therefore, in a narrow viewing angle, the light leakage degree of the liquid crystal display panel is more uniform along with the increase of the viewing angle, so that the problem of gray scale inversion under a large viewing angle can be solved.
Table 2 shows the transmittance and contrast ratio of the liquid crystal display panel in the black and white states in the prior art and the second embodiment of the present invention. Referring to fig. 6 and table 1, compared to the prior art, when the lcd panel is switched to the narrow viewing angle mode, the central contrast ratio of the structure of the present embodiment is reduced by 4.5% compared to the original structure. Therefore, the peep-proof angle of the structure proposed in this embodiment in the narrow viewing angle mode is increased compared to the original structure.
| Narrow viewing angle | Prior Art | This example |
| Black state transmission rate | 100.00％ | 132.50％ |
| White state transmittance | 100.00％ | 125.26％ |
| Center contrast ratio | 100.00％ | 94.54％ |
TABLE 2 [ third example ]
FIG. 7 is a schematic plan view of a sub-pixel according to a third embodiment of the present invention. Referring to fig. 7, in the present embodiment, the first direction a of the liquid crystal molecules in the sub-pixel 101 is taken as a positive direction of the Y-axis, the direction parallel to and opposite to the first direction a is taken as a negative direction of the Y-axis, two directions perpendicular to the first direction a are respectively the positive direction of the X-axis and the negative direction of the X-axis, and the first direction a of the liquid crystal molecules in each sub-pixel 101 is taken as a reference direction (the first direction is 0 °), and each first pixel electrode bar 112 in the sub-pixel 101 forms an angle with the alignment of the liquid crystal molecules. The inclination angle of the first pixel electrode bar 112 in the middle of each sub-pixel 101 is 0 °, and the included angle between the arrangement direction B1 and the first direction a is 0 °; the inclination angle (-28 °) of the leftmost first pixel electrode stripe 112 in each sub-pixel 101 is the smallest, and the arrangement direction B2 forms an angle of 28 ° with the first direction a; the rightmost first pixel electrode bar 112 in each sub-pixel 101 has the largest inclination angle (28 °), and the arrangement direction B3 has an angle of 28 ° with the first direction a. In addition, the included angle between two adjacent first pixel electrode strips 112 in each sub-pixel 101 is equal, and the included angle is 7 °.
In this embodiment, the arrangement directions of the plurality of first pixel electrode bars 112 in each sub-pixel 101 are different, so that the horizontal electric fields formed between the first pixel electrode bars 112 and the common electrode 12 in each sub-pixel 101 for driving the liquid crystal molecules to rotate in the horizontal plane are different, and each sub-pixel 101 is divided into a plurality of regions with different horizontal electric fields by the plurality of first pixel electrode bars 112. Then, in each sub-pixel 101, the angle of deflection of the liquid crystal molecules gradually increases from the middle to both sides. Therefore, in a narrow viewing angle, the light leakage degree of the liquid crystal display panel is more uniform along with the increase of the viewing angle, so that the problem of gray scale inversion under a large viewing angle can be solved.
Table 3 shows the transmittance and contrast ratio data of the LCD panel in the black and white states of the prior art and the third embodiment of the present invention. Referring to fig. 7 and table 3, compared to the prior art, when the lcd panel is switched to the narrow viewing angle mode, the central contrast ratio of the structure of the present embodiment is reduced by 5.24% compared to the original structure. Therefore, the privacy angle of the proposed architecture in the narrow viewing angle mode is increased compared to the original architecture.
TABLE 3 [ fourth example ]
FIG. 8 is a schematic plan view of a sub-pixel according to a fourth embodiment of the present invention. Referring to fig. 8, in the present embodiment, the first direction a of the liquid crystal molecules in the sub-pixel 101 is taken as a positive direction of the Y-axis, the direction parallel to and opposite to the first direction a is taken as a negative direction of the Y-axis, two directions perpendicular to the first direction a are respectively the positive direction of the X-axis and the negative direction of the X-axis, and the first direction a of the liquid crystal molecules in each sub-pixel 101 is taken as a reference direction (the first direction is 0 °), and each first pixel electrode bar 112 in the sub-pixel 101 forms an angle with the alignment of the liquid crystal molecules. The inclination angle of the first pixel electrode bar 112 in the middle of each sub-pixel 101 is 0 °, and the included angle between the arrangement direction B1 and the first direction a is 0 °; the inclination angle (-42 °) of the leftmost first pixel electrode stripe 112 in each sub-pixel 101 is the smallest, and the arrangement direction B2 forms an angle of 42 ° with the first direction a; the rightmost first pixel electrode bar 112 in each sub-pixel 101 has the largest inclination angle (42 °), and the arrangement direction B3 has an angle of 42 ° with the first direction a. In addition, the included angle between two adjacent first pixel electrode strips 112 in each sub-pixel 101 is equal, and the included angle is 7 °.
In this embodiment, the arrangement directions of the plurality of first pixel electrode bars 112 in each sub-pixel 101 are different, so that the horizontal electric fields formed between the first pixel electrode bars 112 and the common electrode 12 in each sub-pixel 101 for driving the liquid crystal molecules to rotate in the horizontal plane are different, and each sub-pixel 101 is divided into a plurality of regions with different horizontal electric fields by the plurality of first pixel electrode bars 112. Then, in each sub-pixel, the angle of deflection of the liquid crystal molecules gradually increases from the middle to both sides. Therefore, in a narrow viewing angle, the light leakage degree of the liquid crystal display panel is more uniform along with the increase of the viewing angle, so that the problem of gray scale inversion under a large viewing angle can be solved.
Table 4 shows the transmittance and contrast ratio data of the liquid crystal display panel in the black and white states of the prior art and the fourth embodiment of the present invention. Referring to fig. 8 and table 4, compared to the prior art, when the lcd panel is switched to the narrow viewing angle mode, the central contrast ratio of the structure of the present embodiment is reduced by 4.54% compared to the original structure. Therefore, the privacy angle of the proposed architecture in the narrow viewing angle mode is increased compared to the original architecture.
TABLE 4
[ fifth embodiment ]
Fig. 9 is a schematic plan view of a sub-pixel according to a fifth embodiment of the present invention. Referring to fig. 8, the difference between the present embodiment and the first embodiment is that the pixel electrode 11 within the lateral deflection angle of each sub-pixel further includes a second pixel electrode portion 114 electrically connected to the first pixel electrode portion 111, the second pixel electrode portion 114 is mirror-symmetric to the first pixel electrode portion 111, and the second pixel electrode portion 114 includes a plurality of second pixel electrode bars 115 with different inclination angles.
Referring to fig. 9, in the present embodiment, the first direction a of the liquid crystal molecules in the sub-pixel 101 is taken as a positive direction of the Y-axis, the direction parallel to and opposite to the first direction a is taken as a negative direction of the Y-axis, two directions perpendicular to the first direction a are respectively the positive direction of the X-axis and the negative direction of the X-axis, and the first direction a of the liquid crystal molecules in each sub-pixel 101 is taken as a reference direction (the first direction is 0 °), and each first pixel electrode bar 112 in the sub-pixel 101 forms an included angle with the alignment of the liquid crystal molecules. The inclination angle of the first pixel electrode bar 112 in the middle of each sub-pixel 101 is 0 °, and the included angle between the arrangement direction B1 and the first direction a is 0 °; the inclination angle (-14 °) of the leftmost first pixel electrode bar 112 in each sub-pixel 101 is the smallest, and the arrangement direction B2 forms an angle of 14 ° with the first direction a; the rightmost first pixel electrode bar 112 in each sub-pixel 101 has the largest inclination angle (14 °), and the arrangement direction B3 has an angle of 14 ° with respect to the first direction a. In addition, the included angle between two adjacent first pixel electrode strips 112 in each sub-pixel 101 is equal, and the included angle is 7 °.
In this embodiment, the arrangement directions of the plurality of first pixel electrode bars 112 in each sub-pixel 101 are different, so that the horizontal electric fields formed between the first pixel electrode bars 112 and the common electrode 12 in each sub-pixel 101 for driving the liquid crystal molecules to rotate in the horizontal plane are different, and each sub-pixel 101 is divided into a plurality of regions with different horizontal electric fields by the plurality of first pixel electrode bars 112. Then, in each sub-pixel 101, the angle of deflection of the liquid crystal molecules gradually increases from the middle to both sides. Therefore, in a narrow viewing angle, the light leakage degree of the liquid crystal display panel is more uniform along with the increase of the viewing angle, so that the problem of gray scale inversion under a large viewing angle can be solved.
Table 5 shows the transmittance and contrast ratio data of the LCD panel in the black and white states of the prior art and the fifth embodiment of the present invention. Referring to fig. 9 and table 5, compared to the prior art, when the lcd panel is switched to the narrow viewing angle mode, the central contrast ratio of the structure of the present embodiment is reduced by 1.22% compared to the original structure. Therefore, the privacy angle of the proposed architecture in the narrow viewing angle mode is increased compared to the original architecture.
TABLE 5
[ sixth embodiment ]
The embodiment provides a driving method of a liquid crystal display panel, which comprises the following steps:
in the wide viewing angle mode, a reference common voltage is applied to the common electrode 12 on the first substrate 10, and a first voltage signal having a smaller voltage difference with respect to the reference common voltage is applied to the viewing angle control electrode 21 on the second substrate 20, so that the voltage difference between the common electrode 12 and the viewing angle control electrode 21 is smaller than a preset value;
in the narrow viewing angle mode, a reference common voltage is applied to the common electrode 12 on the first substrate 10, and a second voltage signal having a large voltage difference with respect to the reference common voltage is applied to the viewing angle control electrode 21 on the second substrate 20, so that the voltage difference between the common electrode 12 and the viewing angle control electrode 21 is greater than a preset value.
Further, in the wide viewing angle mode, the first voltage signal applied to the viewing angle control electrode 21 is the same as the reference common voltage applied to the common electrode 12, so that the voltage difference between the common electrode 12 and the viewing angle control electrode 21 is zero; in the narrow viewing angle mode, the second voltage signal applied to the viewing angle control electrode 21 is an ac voltage, so that the voltage difference between the common electrode 12 and the viewing angle control electrode 21 is greater than or equal to 3V.
The invention provides a liquid crystal display panel with switchable visual angles and a driving method thereof.A plurality of sub-pixels 101 which are arranged in an array form are formed on a first substrate 10, a pixel electrode 11 comprising a first pixel electrode part 111 is arranged in each sub-pixel 101, and the first pixel electrode part 111 comprises a plurality of first pixel electrode strips 112 with different inclination angles, so that each sub-pixel 101 is divided into a plurality of areas, and horizontal electric fields driving liquid crystal molecules to rotate in a horizontal plane in each area are different, so that the oblique light leakage of the liquid crystal display panel with a large visual angle in a narrow visual angle mode can be reduced, and the gray scale inversion phenomenon in the narrow visual angle mode can be improved.
In this document, 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 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.
The features of the embodiments and embodiments described herein above may be combined with each other without conflict.
Claims (10)
1. A liquid crystal display panel with switchable visual angles is characterized by comprising a first substrate (10), a second substrate (20) and a liquid crystal layer (30) clamped between the first substrate (10) and the second substrate (20), a common electrode (12) and a pixel electrode (11) are arranged on the first substrate (10), the second substrate (20) is provided with a viewing angle control electrode (21), the first substrate (10) is provided with a plurality of sub-pixels (101) which are arranged in an array, each sub-pixel (101) is internally provided with the pixel electrode (11), the pixel electrode (11) in each sub-pixel (101) comprises a first pixel electrode part (111), the first pixel electrode portion (111) comprises a plurality of first pixel electrode strips (112) which are electrically connected together, and the inclination angles of the plurality of first pixel electrode strips (112) are different.
2. The switchable liquid crystal display panel of claim 1, wherein the alignment direction of the liquid crystal molecules in the liquid crystal layer (30) comprises a first direction (a), the arrangement direction of the first pixel electrode stripes (112) in the sub-pixels (101) comprises a second direction (B), the included angle between the second direction (B) of the first pixel electrode stripes (112) and the first direction (a) of the liquid crystal molecules in the first sub-pixels (101) from the middle to the two sides is gradually increased, and the included angle between two adjacent first pixel electrode stripes (112) in the plurality of first pixel electrode stripes (112) is equal.
3. The switchable viewing angle liquid crystal display panel of claim 2, wherein an angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 42 °, and an angle between two adjacent first pixel electrode bars (112) in the plurality of first pixel electrode bars (112) is 7 °.
4. The switchable viewing angle liquid crystal display panel of claim 2, wherein an angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 28 °, and an angle between two adjacent first pixel electrode bars (112) in the plurality of first pixel electrode bars (112) is 7 °.
5. The switchable viewing angle liquid crystal display panel of claim 2, wherein an angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 24 °, and an angle between two adjacent first pixel electrode bars (112) in the plurality of first pixel electrode bars (112) is 6 °.
6. The switchable viewing angle liquid crystal display panel of claim 2, wherein an angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 20 °, and an angle between two adjacent first pixel electrode bars (112) in the plurality of first pixel electrode bars (112) is 5 °.
7. The switchable viewing angle liquid crystal display panel of claim 2, wherein an angle between the first direction (a) and the second direction (B) is greater than or equal to 0 ° and less than or equal to 14 °, and an angle between two adjacent first pixel electrode bars (112) in the plurality of first pixel electrode bars (112) is 7 °.
8. The switchable liquid crystal display panel of claim 1, wherein the pixel electrode (11) in each of the sub-pixels (101) comprises a second pixel electrode portion (114) electrically connected to the first pixel electrode portion (111), the second pixel electrode portion (114) is mirror symmetric with the first pixel electrode portion (111), and the second pixel electrode portion (114) comprises a plurality of second pixel electrode bars (115) with different tilt angles.
9. A driving method of a viewing angle switchable liquid crystal display panel according to any one of claims 1 to 8, wherein the driving method comprises:
in a wide viewing angle mode, applying a reference common voltage to a common electrode (12) on the first substrate (10), and applying a first voltage signal having a smaller voltage difference with respect to the reference common voltage to a viewing angle control electrode (21) on the second substrate (20), so that the voltage difference between the common electrode (12) and the viewing angle control electrode (21) is less than a preset value;
in the narrow viewing angle mode, a reference common voltage is applied to the common electrode (12) on the first substrate (10), and a second voltage signal having a larger voltage difference with respect to the reference common voltage is applied to the viewing angle control electrode (21) on the second substrate (20), so that the voltage difference between the common electrode (12) and the viewing angle control electrode (21) is greater than a preset value.
10. The driving method according to claim 9, wherein in the wide viewing angle mode, the first voltage signal applied to the viewing angle control electrode (21) is the same as a reference common voltage applied to the common electrode (12), so that a voltage difference between the common electrode (12) and the viewing angle control electrode (21) is zero; in the narrow viewing angle mode, the second voltage signal applied to the viewing angle control electrode (21) is an alternating voltage, so that the voltage difference between the common electrode (12) and the viewing angle control electrode (21) is greater than or equal to 3V.
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