CN114415401B - Display panel with switchable wide and narrow viewing angles, driving method and display device - Google Patents
Display panel with switchable wide and narrow viewing angles, driving method and display device Download PDFInfo
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- CN114415401B CN114415401B CN202111630602.1A CN202111630602A CN114415401B CN 114415401 B CN114415401 B CN 114415401B CN 202111630602 A CN202111630602 A CN 202111630602A CN 114415401 B CN114415401 B CN 114415401B
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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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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Abstract
The embodiment of the invention discloses a display panel with a switchable wide and narrow viewing angle, a driving method and a display device, wherein the display panel comprises a dimming box, the dimming box comprises a first substrate, a first viewing angle control electrode, a first alignment layer, a first liquid crystal layer, a second alignment layer, a second viewing angle control electrode and a second substrate which are arranged in an intersecting manner, an included angle formed between a first alignment direction of the first alignment layer and a second alignment direction of the second alignment layer is an acute angle, the dimming box is vertically symmetrical along a central axis of the first liquid crystal layer, and projections of the first alignment direction and the second alignment direction on the second substrate are parallel to each other and are in the same direction. The first alignment direction and the second alignment direction are arranged to form an acute angle, and are vertically symmetrical along the central axis of the first liquid crystal layer, the first liquid crystal layer close to the first substrate and the first liquid crystal layer close to the second substrate are complementary, and the delta nd of the first liquid crystal layer is the same when being watched from any two opposite sides, so that the problems of white picture color cast difference and peeping prevention angle asymmetry can be effectively solved.
Description
Technical Field
The invention relates to the technical field of displays, in particular to a display panel with switchable wide and narrow viewing angles, a driving method and a display device.
Background
With the continuous progress of the liquid crystal display technology, the visual angle of the display is widened to more than 122 degrees from the original 112 degrees, and people enjoy the visual experience brought by a large visual angle, and meanwhile, the business confidentiality and personal privacy are expected to be effectively protected, so that the business loss or embarrassment caused by the leakage of screen information is avoided. In addition to the wide viewing angle requirement, there are many occasions where the display device is required to have a function of switching between wide and narrow viewing angles.
At present, the shutter shielding film is attached to the display screen to realize wide and narrow viewing angle switching, when peep prevention is needed, the shutter shielding film is utilized to shield the screen, so that the viewing angle can be reduced, but the shutter shielding film is additionally prepared in the mode, great inconvenience is caused to a user, one shutter shielding film can only realize one viewing angle, once the shutter shielding film is attached, the viewing angle is fixed in a narrow viewing angle mode, free switching cannot be performed between the wide viewing angle mode and the narrow viewing angle mode, and the peep prevention sheet can cause luminance reduction to influence the display effect.
In the prior art, a vertical electric field is applied to liquid crystal molecules by using a viewing angle control electrode on one side of a color filter substrate (CF), so that the liquid crystal deflects towards a vertical direction, and a narrow viewing angle mode is realized. Switching between a wide viewing angle and a narrow viewing angle can be achieved by controlling the voltage on the viewing angle control electrode. However, in this display panel, the alignment direction of the liquid crystal layer near the color film substrate is parallel or antiparallel to the alignment direction near the array substrate, so that the existing parallel or antiparallel alignment manner can cause color deviation difference in wide viewing angle, and the white picture has problems of purple or blue deviation, which causes poor image quality, and the peep-proof angle is asymmetric, which affects the peep-proof effect.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention aims to provide a display panel with a switchable wide and narrow viewing angles, a driving method and a display device, so as to solve the problems of color deviation and asymmetric peep-proof angle of the display panel with the switchable wide and narrow viewing angles in the prior art.
The aim of the invention is achieved by the following technical scheme:
the invention provides a display panel with switchable wide and narrow visual angles, which comprises a dimming box and a display box which is overlapped with the dimming box;
The dimming box comprises a first substrate, a second substrate and a first liquid crystal layer, wherein the second substrate is arranged opposite to the first substrate, the first liquid crystal layer is arranged between the first substrate and the second substrate, a first polaroid is arranged on the first substrate, a second polaroid is arranged on the second substrate, a first transmission axis of the first polaroid is perpendicular to a second transmission axis of the second polaroid, a first visual angle control electrode is arranged on one side of the first substrate, facing the first liquid crystal layer, of the first substrate, a second visual angle control electrode matched with the first visual angle control electrode is arranged on one side of the second substrate, facing the first liquid crystal layer, a first alignment layer is arranged on one side of the first substrate, facing the first liquid crystal layer, an included angle formed between a first alignment direction of the first alignment layer and a second alignment direction of the second alignment layer is an acute angle, the first alignment direction and the second alignment direction of the second alignment layer are vertically symmetrical along the central axis of the first liquid crystal layer, and the first alignment direction and the second alignment direction are parallel to each other in the same projection direction of the second alignment direction.
Further, an included angle formed between the first alignment direction and the first substrate is α1, and an included angle formed between the second alignment direction and the second substrate is α2, wherein 0< α2= - α 1<7 °.
Further, an included angle formed by the first alignment direction and the projection of the first transmission axis on the second substrate is θ1, and an included angle formed by the second alignment direction and the projection of the first transmission axis on the second substrate is θ2, wherein 30 ° < θ1=θ2<60 °.
Further, the second viewing angle controlling electrode includes a first electrode including a plurality of first electrode bars and a second electrode including a plurality of second electrode bars, the first electrode bars being parallel to the second electrode bars and alternately arranged with each other.
Further, the angle between the projection of the first electrode strip and the second electrode strip on the second substrate and the projection of the first alignment direction on the second substrate is 0-7 degrees.
Further, the display box comprises a color film substrate, an array substrate arranged opposite to the color film substrate and a second liquid crystal layer positioned between the color film substrate and the array substrate, a third polaroid is arranged on one side, far away from the dimming box, of the display box, and a light transmission axis of the polaroid between the dimming box and the display box is mutually perpendicular to a light transmission axis of the third polaroid.
Further, the first electrode further comprises a first wire electrically connecting the plurality of first electrode bars, and the second electrode further comprises a second wire electrically connecting the plurality of second electrode bars.
The present invention also provides a driving method of a display panel for driving the display panel with switchable wide and narrow viewing angles as described above, the display panel with switchable wide and narrow viewing angles including a wide viewing angle mode, a narrow viewing angle mode, and a viewing angle transition mode, the driving method comprising: when the wide view angle mode and the narrow view angle mode are switched, the view angle transition mode is inserted between the wide view angle mode and the narrow view angle mode;
in the wide viewing angle mode, a pressure difference between the first viewing angle control electrode and the second viewing angle control electrode is smaller than a preset value;
in the narrow viewing angle mode, the pressure difference between the first viewing angle control electrode and the second viewing angle control electrode is larger than a preset value;
in the viewing angle transition mode, a magnitude of a pressure difference between the first viewing angle control electrode and the second viewing angle control electrode is between a pressure difference in the narrow viewing angle mode and a pressure difference in the wide viewing angle mode.
Further, the second viewing angle control electrode includes a first electrode including a plurality of first electrode bars and a second electrode including a plurality of second electrode bars, the first electrode bars being parallel to the second electrode bars and alternately arranged with each other;
In the wide viewing angle mode, a first direct current common voltage is applied to the first viewing angle control electrode, a first alternating current voltage is applied to the first electrode, a second alternating current voltage is applied to the second electrode, and the periods of the first alternating current voltage and the second alternating current voltage are the same and the polarities of the first alternating current voltage and the second alternating current voltage are opposite;
in the narrow viewing angle mode, a first direct current common voltage is applied to the first viewing angle control electrode, a third alternating current voltage is applied to the first electrode, a fourth alternating current voltage is applied to the second electrode, and the amplitude, the period and the polarity of the third alternating current voltage are the same as those of the fourth alternating current voltage;
in the viewing angle transition mode, a first direct current common voltage is applied to the first viewing angle control electrode, a second direct current common voltage is applied to the first electrode, a fifth alternating current voltage is applied to the second electrode, and the amplitude of the fifth alternating current voltage is larger than that of the fourth alternating current voltage and smaller than that of the second alternating current voltage.
The invention also provides a driving method of the display panel, which is used for driving the display panel with the switchable wide and narrow viewing angles, wherein the display panel with the switchable wide and narrow viewing angles comprises a wide viewing angle mode and a narrow viewing angle mode, the second viewing angle control electrode comprises a first electrode and a second electrode, the first electrode comprises a plurality of first electrode strips, the second electrode comprises a plurality of second electrode strips, and the first electrode strips and the second electrode strips are parallel and are alternately arranged;
The driving method comprises the following steps:
in the wide view angle mode, a first direct current public voltage is applied to the first view angle control electrode, a first alternating current voltage is applied to the first electrode, a second alternating current voltage is applied to the second electrode, the periods of the first alternating current voltage and the second alternating current voltage are the same and the polarities of the first alternating current voltage and the second alternating current voltage are opposite, and the first alternating current voltage and the second alternating current voltage both adopt stepped waves;
in the narrow viewing angle mode, a first direct current common voltage is applied to the first viewing angle control electrode, a third alternating current voltage is applied to the first electrode, a fourth alternating current voltage is applied to the second electrode, and the amplitude, the period and the polarity of the third alternating current voltage are the same as those of the fourth alternating current voltage.
The invention also provides a display device which comprises the display panel with the switchable wide and narrow viewing angles.
The invention has the beneficial effects that: the first alignment direction and the second alignment direction are arranged to be neither forward parallel nor anti-parallel, but are arranged to be acute angles and are vertically symmetrical along the central axis of the first liquid crystal layer, so that the first liquid crystal layer close to one side of the first substrate is complementary with the first liquid crystal layer close to one side of the second substrate, and the delta nd of the first liquid crystal layer is the same when being watched from any two opposite sides, thereby effectively improving the problems of white color cast difference and peeping prevention angle asymmetry.
Drawings
FIG. 1 is a schematic diagram of a display panel with switchable wide and narrow viewing angles in an initial state according to an embodiment of the invention;
FIG. 2 is a schematic view showing a first transmission axis, a second transmission axis, a first alignment direction and a second alignment direction projected onto a second substrate according to a first embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an analysis of a viewing angle of a first liquid crystal layer according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram showing the analysis of the viewing angle of the liquid crystal layer in the comparative example;
FIG. 5 is a schematic diagram of a display panel with switchable wide and narrow viewing angles in a wide viewing angle mode according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a display panel with switchable wide and narrow viewing angles in a narrow viewing angle mode according to an embodiment of the present invention;
FIG. 7 is a schematic plan view of a first electrode and a second electrode according to a first embodiment of the present invention;
FIG. 8 is a graph showing the contrast of color shift and viewing angle in the left-right direction in the wide viewing angle mode of the present invention and the comparative embodiment;
FIG. 9 is a graph showing the contrast of color shift and viewing angle in the up-down direction in the wide viewing angle mode according to the first embodiment of the present invention and the comparative embodiment;
FIG. 10 is a graph showing the comparison of color temperature and viewing angle in the left-right direction in the narrow viewing angle mode according to the first embodiment of the present invention and the comparative embodiment;
FIG. 11 is a graph showing the comparison of color temperature and viewing angle in the up-down direction in the narrow viewing angle mode according to the first embodiment of the present invention and the comparative embodiment;
FIG. 12 is a graph showing the transmittance versus viewing angle in the left-right direction for the narrow viewing angle mode in accordance with the first embodiment of the present invention and the comparative embodiment;
FIG. 13 is a graph showing the ratio of transmittance in the up-down direction to viewing angle in the narrow viewing angle mode according to the first embodiment of the present invention and the comparative embodiment;
FIG. 14 is a schematic view of waveforms applied to a wide-narrow view switchable display panel in a wide view mode according to an embodiment of the present invention;
FIG. 15 is a schematic view of waveforms applied to a display panel with switchable wide and narrow viewing angles in a narrow viewing angle mode according to an embodiment of the present invention;
FIG. 16 is a schematic view of waveforms applied to a wide-narrow view switchable display panel in a view transition mode according to an embodiment of the present invention;
FIG. 17 is a schematic diagram of a driving method of a display panel according to an embodiment of the invention;
FIG. 18 is a schematic diagram showing waveforms applied to a wide-narrow view switchable display panel in a wide-view mode according to a second embodiment of the present invention;
FIG. 19 is a schematic view showing a planar structure of a display device according to the present invention;
FIG. 20 is a schematic diagram showing a second planar structure of the display device according to the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention to achieve the preset aim, the following detailed description is given of the specific implementation, structure, characteristics and effects of the display panel and driving method, display device with switchable wide and narrow viewing angles, which are proposed according to the invention, by combining the accompanying drawings and the preferred embodiment:
example one
Fig. 1 is a schematic view of a display panel with switchable wide and narrow viewing angles in an initial state according to an embodiment of the present invention, fig. 2 is a schematic view of a projection of a first light-transmitting axis, a second light-transmitting axis, a first alignment direction and a second alignment direction on a second substrate according to an embodiment of the present invention, fig. 3 is an analysis schematic view of a viewing angle of a first liquid crystal layer according to an embodiment of the present invention, fig. 4 is an analysis schematic view of a viewing angle of a liquid crystal layer according to a comparative embodiment, fig. 5 is a schematic view of a display panel with switchable wide and narrow viewing angles in a wide viewing angle mode according to an embodiment of the present invention, fig. 6 is a schematic view of a display panel with switchable wide and narrow viewing angles in a narrow viewing angle mode according to an embodiment of the present invention, fig. 7 is a schematic view of a planar structure of a first electrode and a second electrode according to an embodiment of the present invention, fig. 8 is a graph of color shift and viewing angle in a left and right direction according to a comparative embodiment of the present invention, fig. 9 is a graph showing the contrast of color shift and viewing angle in the up-down direction in the wide viewing angle mode of the first embodiment of the present invention and the comparative embodiment of the present invention, fig. 10 is a graph showing the contrast of color temperature and viewing angle in the left-right direction in the narrow viewing angle mode of the first embodiment of the present invention and the comparative embodiment of the present invention, fig. 11 is a graph showing the contrast of color temperature and viewing angle in the up-down direction in the narrow viewing angle mode of the first embodiment of the present invention and the comparative embodiment of the present invention, fig. 12 is a graph showing the contrast of transmittance and viewing angle in the left-right direction in the narrow viewing angle mode of the first embodiment of the present invention, fig. 13 is a graph showing the waveform applied by the switchable display panel in the wide viewing angle mode in the first embodiment of the present invention, fig. 15 is a schematic waveform diagram of a display panel with switchable wide and narrow viewing angles in a narrow viewing angle mode according to an embodiment of the present invention, fig. 16 is a schematic waveform diagram of a display panel with switchable wide and narrow viewing angles in a viewing angle transition mode according to an embodiment of the present invention, and fig. 17 is a schematic diagram of a driving method of a display panel according to an embodiment of the present invention.
As shown in fig. 1 to 7, a display panel with switchable wide and narrow viewing angles according to an embodiment of the invention includes a dimming box 10 and a display box 20 stacked with the dimming box 10. In this embodiment, the dimming box 10 is disposed below the display box 20, that is, the dimming box 10 is disposed between the display box 20 and the backlight module 40, the dimming box 10 is used for controlling the viewing angle of the display device, and the display box 20 is used for controlling the display device to display a normal image. Of course, the dimming box 10 may be disposed above the display box 20, or the dimming box 10 may be disposed on both sides of the display box 20.
The dimming box 10 includes a first substrate 11, a second substrate 12 disposed opposite to the first substrate 11, and a first liquid crystal layer 13 disposed between the first substrate 11 and the second substrate 12. Preferably, the first liquid crystal layer 13 is a positive liquid crystal molecule, i.e., a liquid crystal molecule having positive dielectric anisotropy. The phase retardation of the first liquid crystal layer 13 is preferably 800nm, optionally in the range of 500nm to 1600nm. As shown in fig. 1, in the initial state, the positive liquid crystal molecules near the first substrate 10 and the positive liquid crystal molecules near the second substrate 20 are inclined in the same direction, i.e., the long axes of the positive liquid crystal molecules near the first substrate 10 and the long axes of the positive liquid crystal molecules near the second substrate 20 form a certain angle.
Specifically, the first substrate 11 is provided with a first alignment layer (not shown) on a side facing the first liquid crystal layer 13, the first alignment layer being for aligning the positive liquid crystal molecules on a side close to the first substrate 10, that is, long axes of the positive liquid crystal molecules on a side close to the first substrate 11 are parallel to the first alignment direction P1; the second substrate 12 is provided with a second alignment layer (not shown) on a side facing the first liquid crystal layer 13 for aligning the positive liquid crystal molecules on a side close to the second substrate 20, i.e., the long axes of the positive liquid crystal molecules on a side close to the second substrate 12 are parallel to the second alignment direction P2. The included angle formed between the first alignment direction P1 of the first alignment layer and the second alignment direction P2 of the second alignment layer is an acute angle, and the first alignment direction P1 and the second alignment direction P2 are vertically symmetrical along the central axis of the first liquid crystal layer 13, that is, the long axis of the positive liquid crystal molecules near the first substrate 11 side and the long axis of the positive liquid crystal molecules near the second substrate 20 side are acute angles, and are vertically symmetrical about the central axis of the first liquid crystal layer 13. As shown in fig. 1, the first alignment direction P1 is inclined toward the lower side of the first substrate 11 and forms an angle α1 with the first substrate 11, the second alignment direction P2 is inclined toward the upper side of the second substrate 12 and forms an angle α2 with the second substrate 12, and the angle is inclined upward as a positive angle and the angle is inclined downward as a negative angle. The included angle formed between the first alignment direction P1 and the second alignment direction P2 is |alpha 1|+|alpha 2|. Wherein 0< α2= - α 1<7 °, i.e. -7 ° < α 1<0. Preferably, α2= - α1=4.5°, i.e. the first alignment direction P1 is inclined 4.5 ° towards the lower side of the first substrate 11 and the second alignment direction P2 is inclined 4.5 ° towards the upper side of the second substrate 12.
Further, as shown in fig. 1 and 2, a first polarizer 31 is disposed on the first substrate 11, a second polarizer 32 is disposed on the second substrate 12, and a first transmission axis T1 of the first polarizer 31 and a second transmission axis T2 of the second polarizer 32 are perpendicular to each other.
As shown in fig. 2, the projections of the first alignment direction P1 and the second alignment direction P2 on the second substrate 12 are parallel and co-directional. As shown in a of fig. 2, an angle formed by the first alignment direction P1 and the projection of the first transmission axis T1 on the second substrate 12 is θ1. As shown in b of fig. 2, the second alignment direction P2 forms an angle θ2 with the projection of the first transmission axis T1 on the second substrate 12, wherein 30 ° < θ1=θ2<60 °. Preferably, θ1=θ2=45°.
Further, the first substrate 11 is provided with a first viewing angle control electrode 111 on a side facing the first liquid crystal layer 13, and the second substrate 12 is provided with a second viewing angle control electrode cooperating with the first viewing angle control electrode 111 on a side facing the first liquid crystal layer 13. The first viewing angle control electrode 111 and the second viewing angle control electrode are used to form a vertical electric field to drive the positive liquid crystal molecules in the first liquid crystal layer 13 to deflect in a vertical reverse direction, thereby enabling the light modulation cell 10 to switch between a wide viewing angle mode and a narrow viewing angle mode.
As shown in fig. 3, the first alignment direction P1 and the second alignment direction P2 are set to be neither forward parallel nor anti-parallel, but the first alignment direction P1 and the second alignment direction P2 are set to be acute angles and are vertically symmetrical along the central axis of the first liquid crystal layer 13, so that the first liquid crystal layer 13 near the first substrate 11 and the first liquid crystal layer 13 near the second substrate 12 are complementary, and the Δnd of the first liquid crystal layer 13 is the same when being viewed from any two opposite sides, thereby effectively improving the problems of white color cast and anti-peeping angle asymmetry.
As shown in fig. 4, fig. 4 is a comparative example of the present invention, and the present invention and the comparative example have the same structure except for the alignment direction of the liquid crystal layer. In the comparative embodiment, the first alignment direction P1 and the second alignment direction P2 are antiparallel. When viewed from the left direction, the change in Δn (refractive index) of the liquid crystal layer is small and the increase in d (thickness) is relatively large at a large viewing angle, so that the effective Δnd is continuously large, the specific gravity of the transmittance of blue light is reduced, and the white screen is yellowish. When seen from the right direction, d increases, but Δn decreases faster, and the effective Δnd becomes smaller, i.e., the white screen is bluish.
In the present embodiment, the first viewing angle control electrode 111 is a planar electrode that entirely covers the first substrate 11. As shown in fig. 7, the second viewing angle control electrode includes a first electrode 121 and a second electrode 122, the first electrode 121 includes a plurality of first electrode bars 121a, and the second electrode 122 includes a plurality of second electrode bars 122a, the first electrode bars 121a being parallel to the second electrode bars 122a and alternately arranged with each other. The first electrode 121 and the second electrode 122 are comb-shaped electrodes that cover the entire surface of the second substrate 12, that is, the entire surface of the first electrode 121 and the second electrode 122 that is uninterrupted covers the second substrate 12. Of course, in other embodiments, the first electrode 121 and the second electrode 122 may be comb-shaped electrodes corresponding to the sub-pixels, and then the first electrode 121 and the second electrode 122 are controlled by the thin film transistor, i.e. the second substrate 12 is configured as an array substrate.
Further, as shown in fig. 7, the projection of the first electrode stripe 121a and the second electrode stripe 122a on the second substrate 12 forms an included angle β with the projection of the first alignment direction P1 on the second substrate 12, and 0< β <7 °. For example, the first transmission axis T1 of the first polarizer 31 is 90 °, the second transmission axis T2 of the second polarizer 32 is 0 °, the projection angle of the first alignment direction P1 on the second substrate 12 is 45 °, and the extending direction of the first electrode stripe 121a and the extending direction of the second electrode stripe 122a are 38 ° or 52 °.
In this embodiment, the first electrode 121 and the second electrode 122 are located in different layers and insulated from each other, the first electrode 121 further includes a first conductive line 121b, the first conductive line 121b electrically connects the plurality of first electrode bars 121a, the second electrode 122 further includes a second conductive line 122b, the second conductive line 122b electrically connects the plurality of second electrode bars 122a, and the number of the first conductive line 121b and the second conductive line 122b is plural, so as to reduce the resistance of the first electrode 121 and the second electrode 122. The extending direction of the first conductive line 121b is perpendicular to the extending direction of the first electrode bar 121a, and the extending direction of the second conductive line 122b is perpendicular to the extending direction of the second electrode bar 122 a. Of course, in other embodiments, the first electrode 121 and the second electrode 122 may be located on the same layer and isolated from each other, where the first conductive line 121b and the second conductive line 122b need to be disposed in a non-display area of the edge of the display panel.
Further, the width d1 of the first conductive line 121b is 3-4 μm, the width d2 of the second conductive line 122b is 3-4 μm, and the distance h1 between the first conductive line 121b and the second conductive line 122b is 3-10 μm. Preferably, the width d1 of the first conductive line 121b is 3.5 μm, the width d2 of the second conductive line 122b is 3.5 μm, and the distance h1 between the first conductive line 121b and the second conductive line 122b is 5.5 μm.
Further, the width d3 of the first electrode stripe 121a is 3-4 μm, and the width d4 of the second electrode stripe 122a is 3-4 μm. Preferably, the width d3 of the first electrode stripe 121a is 3.5 μm and the width d4 of the second electrode stripe 122a is 3.5 μm. That is, the first conductive line 121b has the same width as the first electrode stripe 121a, the second conductive line 122b has the same width as the second electrode stripe 122a, and the first electrode stripe 121a has the same width as the second electrode stripe 122 a.
Further, the projections of the first electrode bars 121a on the plane of the second substrate 12 are alternately arranged at intervals from the projections of the second electrode bars 122a on the plane of the second substrate 12. Specifically, the distance h2 between the projections of the two on the plane of the second substrate 12 is 1-2 μm. Preferably, the distance h2 between the projections of the first electrode stripe 121a and the second electrode stripe 122a on the plane of the second substrate 12 is 1 μm.
The display box 20 includes a color film substrate 21, an array substrate 22 disposed opposite to the color film substrate 21, and a second liquid crystal layer 23 disposed between the color film substrate 21 and the array substrate 22. Preferably, positive liquid crystal molecules, that is, liquid crystal molecules with positive dielectric anisotropy, are used in the second liquid crystal layer 23, and in the initial state, the positive liquid crystal molecules in the second liquid crystal layer 23 are aligned parallel to the color film substrate 21 and the array substrate 22, and the positive liquid crystal molecules on the side close to the color film substrate 21 are aligned parallel or antiparallel to the alignment direction of the positive liquid crystal molecules on the side close to the array substrate 22. In other embodiments, the array substrate 22 and the first substrate 11 may share one substrate to reduce the thickness of the display panel.
The third polarizer 33 is disposed on the side of the display box 20 away from the dimming box 10, and the transmission axis of the polarizer between the dimming box 10 and the display box 20 is perpendicular to the transmission axis of the third polarizer 33. In this embodiment, the third polarizer 33 is disposed on the color film substrate 21, and the transmission axis of the third polarizer 33 is perpendicular to the first transmission axis T1 of the first polarizer 31.
The color film substrate 21 is provided with a color resistance layer 212 arranged in an array and a black matrix 211 for spacing the color resistance layer 212, wherein the color resistance layer 212 comprises red (R), green (G) and blue (B) color resistance materials, and sub-pixels of the red (R), green (G) and blue (B) colors are correspondingly formed.
The array substrate 22 is defined by a plurality of scan lines and a plurality of data lines on a side facing the second liquid crystal layer 23, each pixel unit is provided with a pixel electrode 222 and a thin film transistor, and the pixel electrode 222 is electrically connected with the data line adjacent to the thin film transistor through the thin film transistor. The thin film transistor includes a gate electrode, an active layer, a drain electrode, and a source electrode, wherein the gate electrode and the scan line are disposed on the same layer and electrically connected, the gate electrode and the active layer are separated by an insulating layer, the source electrode and the data line are electrically connected, and the drain electrode and the pixel electrode 222 are electrically connected by a contact hole.
As shown in fig. 1, in the present embodiment, a common electrode 221 is further disposed on a side of the array substrate 22 facing the second liquid crystal layer 23, and the common electrode 221 and the pixel electrode 222 are located on different layers and are insulated and isolated by an insulating layer. The common electrode 221 may be located above or below the pixel electrode 222 (the common electrode 221 is shown below the pixel electrode 222 in fig. 1). Preferably, the common electrode 221 is a planar electrode disposed entirely, and the pixel electrode 222 is a block electrode disposed entirely within each pixel unit or a slit electrode having a plurality of electrode bars to form a fringe field switching pattern (Fringe Field Switching, FFS). Of course, in other embodiments, the pixel electrode 222 and the common electrode 221 may be located at the same layer, but they are insulated from each other, each of the pixel electrode 222 and the common electrode 221 may include a plurality of electrode bars, and the electrode bars of the pixel electrode 222 and the electrode bars of the common electrode 221 are alternately arranged with each other to form an In-Plane Switching (IPS); alternatively, in other embodiments, the pixel electrode 222 is disposed on the side facing the second liquid crystal layer 23 of the array substrate 22, and the common electrode 221 is disposed on the side facing the second liquid crystal layer 23 of the color film substrate 21 to form a TN mode or a VA mode, and other descriptions of the TN mode and the VA mode refer to the prior art, and are not repeated herein.
The first substrate 11, the second substrate 12, the color film substrate 21, and the array substrate 22 may be made of glass, acrylic, polycarbonate, or the like. The materials of the first viewing angle controlling electrode 111, the first and second electrodes 121 and 122, the common electrode 221, and the pixel electrode 222 may be Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO), etc.
Further, a backlight module 40 is disposed on a side of the dimming box 10 away from the display box 20, and preferably, the backlight module 40 adopts a collimated backlight (CBL, collimated backlight) mode, which can collect light to ensure display effect.
The backlight module 40 includes a backlight 41 and a peep-proof layer 43, wherein the peep-proof layer 43 is used for reducing the range of the light emitting angle. A brightness enhancement film 42 is further disposed between the backlight 41 and the peep-proof layer 43, and the brightness enhancement film 42 increases the brightness of the backlight module 40. The peep-proof layer 43 is a micro shutter structure, which can block light with a larger incident angle, so that light with a smaller incident angle passes through the shutter structure, and the angle range of the light passing through the peep-proof layer 43 is reduced. The peep-proof layer 43 comprises a plurality of parallel light-resisting walls and light holes between two adjacent light-resisting walls, and light-absorbing materials are arranged on two sides of the light-resisting walls. Of course, the backlight 41 may be a light-collecting type backlight, so that the peep-proof layer 43 is not required, but the light-collecting type backlight is more expensive than a conventional backlight. The backlight module 40 may be a side-in type backlight module or a direct type backlight module.
In other embodiments, display box 20 may also be a self-emissive display box, such as an OLED display box. The dimming box 10 is positioned above the OLED display box to dim light. When the display box is a self-luminous display box, a backlight module is not required to be arranged. The self-luminous display box can also be other self-luminous display boxes such as Micro LED display boxes.
The invention also provides a driving method of the display panel, which is used for driving the display panel with the switchable wide and narrow visual angles, wherein the display panel with the switchable wide and narrow visual angles comprises a wide visual angle mode, a narrow visual angle mode and a visual angle transition mode. The driving method comprises the following steps: as shown in fig. 17, when switching between the wide view mode and the narrow view mode, the view transition mode is interposed between the wide view mode and the narrow view mode. For example, when switching from the wide view angle mode to the narrow view angle mode, the display panel is controlled to display and switch to the view angle transition mode and then to switch to the narrow view angle mode; or when switching from the narrow view angle mode to the wide view angle mode, controlling the display panel to display and switch to the view angle transition mode and then to switch to the wide view angle mode.
As shown in fig. 5 and 14, in the wide viewing angle mode, the voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode is smaller than a predetermined value, that is, a vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode. Specifically, the first viewing angle control electrode 111 is applied with a first dc common voltage V11, the first electrode 121 is applied with a first ac voltage V21, the second electrode 122 is applied with a second ac voltage V22, the first ac voltage V21 and the second ac voltage V22 have the same period and opposite polarities, and the magnitude of the first ac voltage V21 is less than or equal to the magnitude of the second ac voltage V22. I.e. a vertical electric field is formed between the first ac voltage V21 and the first dc common voltage V11 and before the second ac voltage V22 and the first dc common voltage V11. A strong horizontal electric field (E2 in fig. 5) is formed between the first electrode 121 and the second electrode 122, so that the positive liquid crystal molecules of the first liquid crystal layer 13 are greatly deflected in the horizontal direction, thereby realizing wide viewing angle display and reducing color shift. The first dc common voltage V11 is 0V, and the magnitudes of the first ac voltage V21 and the second ac voltage V22 may be 4-8V, preferably 5V. The magnitude of the second ac voltage V22 may be 6-13V, preferably 8V, and since the polarities of the first ac voltage V21 and the second ac voltage V22 are opposite, the magnitude of the voltage difference between the first electrode 121 and the second electrode 122 is 13V at any time, so that the wide viewing angle effect is optimal. The frequency of the first alternating voltage V21 and the second alternating voltage V22 is 60Hz-200Hz, preferably 140Hz. Of course, the magnitudes of the first ac voltage V21 and the second ac voltage V22 may be the same.
Fig. 8 is a graph showing the contrast of color shift and viewing angle in the left-right direction in the wide viewing angle mode of the first embodiment (solid line) and the comparative embodiment (broken line) of the present invention. Fig. 9 is a graph showing the comparison of color shift and viewing angle in the up-down direction in the wide viewing angle mode in the first embodiment (solid line) and the comparative embodiment (broken line) of the present invention. Wherein, the abscissa is the angle of view, and the ordinate is the color shift. As can be seen from fig. 8, the color shift of the left and right sides of the comparative embodiment is more serious, and the color shift of the left and right sides of the present invention is more uniform, i.e. the color shift of the left and right sides of the comparative embodiment is larger, and the color shift of the left and right sides of the present invention is smaller, thereby improving the color shift of the opposite sides. As can be seen from fig. 9, the color deviation difference between the upper and lower sides of the comparative example and the present invention is smaller, but the color deviation between the upper and lower sides of the present invention is smaller than that of the comparative example.
As shown in fig. 6 and 15, in the narrow viewing angle mode, the voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode is greater than a preset value, i.e., a strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode, and the positive liquid crystal molecules of the first liquid crystal layer 13 are greatly deflected in the vertical direction, so that the brightness of the display device is reduced in the oblique viewing direction and the viewing angle is narrowed. Specifically, the first dc common voltage V11 is applied to the first viewing angle control electrode 111, the third ac voltage V23 is applied to the first electrode 121, the fourth ac voltage V24 is applied to the second electrode 122, and the magnitudes, periods, and polarities of the third ac voltage V23 and the fourth ac voltage V24 are the same. The vertical electric field formed by the first viewing angle control electrode 111 and the first electrode 121 is in the same direction as and overlaps with the vertical electric field formed by the first viewing angle control electrode 111 and the second electrode 122, so that there is a substantially strong vertical electric field between the first substrate 11 and the second substrate 12 (E3 in fig. 6), and the positive liquid crystal molecules of the first liquid crystal layer 13 are greatly deflected in the vertical direction, so that the brightness of the display device is reduced in the oblique viewing direction and the viewing angle is narrowed. The first dc common voltage V11 is 0V, and the magnitudes of the first ac voltage V21 and the second ac voltage V22 may be 3-7V, preferably 5V, that is, the voltage difference between the first electrode 121 and the second electrode 122 is 0V at any time, so that the narrow viewing angle effect is optimal. The frequency of the first alternating voltage V21 and the second alternating voltage V22 is 60Hz-200Hz, preferably 140Hz.
Fig. 10 is a graph showing the comparison of color temperature and viewing angle in the left-right direction in the narrow viewing angle mode in the first embodiment (solid line) of the present invention and the comparative embodiment (broken line). Fig. 11 is a graph showing the comparison of color temperature and viewing angle in the up-down direction in the narrow viewing angle mode in the first embodiment (solid line) and the comparative embodiment (broken line) of the present invention. Wherein, the abscissa is the angle of view, and the ordinate is the color shift. As can be seen from fig. 10 and 11, the color temperatures of the left and right sides and the upper and lower sides of the comparative embodiment are more uniform, i.e., the color temperature difference between the left and right sides and the upper and lower sides of the comparative embodiment is larger, and the color temperature difference between the left and right sides and the upper and lower sides of the comparative embodiment is smaller, thereby improving the color temperature difference between the opposite sides.
Fig. 12 is a graph showing the ratio of transmittance to viewing angle in the left-right direction in the narrow viewing angle mode in the first embodiment (solid line) of the present invention and the comparative embodiment (broken line). Fig. 13 is a graph showing the ratio of transmittance to viewing angle in the up-down direction in the narrow viewing angle mode in the first embodiment (solid line) of the present invention and the comparative embodiment (broken line). Wherein, the abscissa is the angle of view and the ordinate is the transmittance. As can be seen from fig. 12, the present invention (solid line) has a narrow viewing angle effect in the left-right direction comparable to that of the comparative embodiment (broken line). As can be seen from fig. 13, the narrow viewing angle effect of the present invention (solid line) is more symmetrical on the upper and lower sides with respect to the comparative embodiment (broken line).
FIG. 16 is a schematic view of waveforms applied to a wide-narrow view switchable display panel in a view transition mode according to an embodiment of the present invention; fig. 17 is a schematic diagram of a driving method of a display panel according to a first embodiment of the invention. As shown in fig. 16 and 17, in the viewing angle transition mode, the magnitude of the pressure difference between the first viewing angle control electrode 111 and the second viewing angle control electrode is between the pressure difference in the narrow viewing angle mode and the pressure difference in the wide viewing angle mode. The first dc common voltage V11 is applied to the first viewing angle control electrode 111, the second dc common voltage V12 is applied to the first electrode 121, the fifth ac voltage V25 is applied to the second electrode 122, and the magnitude of the fifth ac voltage V25 is greater than the magnitude of the fourth ac voltage V24 and less than the magnitude of the second ac voltage V22. The first dc common voltage V11 and the second dc common voltage V12 are both 0V, and the amplitude of the fifth ac voltage V25 may be 4-6V, preferably 5V, that is, the voltage difference between the first electrode 121 and the second electrode 122 is 5V at any time. The frequency of the first alternating voltage V21 and the second alternating voltage V22 is 60Hz-200Hz, preferably 140Hz.
Since the voltage difference between the first electrode 121 and the second electrode 122 is 0V in the narrow viewing angle mode, the voltage difference between the first electrode 121 and the second electrode 122 is 13V in the wide viewing angle mode, and the voltage difference between the first electrode 121 and the second electrode 122 is greatly changed in the narrow viewing angle mode and the wide viewing angle mode. If the switching between the narrow viewing angle mode and the wide viewing angle mode is directly performed, the voltage difference between the first electrode 121 and the second electrode 122 may be instantaneously increased or decreased, that is, the fringe electric field intensity formed between the first electrode 121 and the second electrode 122 may be instantaneously increased or decreased, the polarization problem may occur in the liquid crystal molecules, and the display unevenness problem may occur in the display panel. According to the method and the device, the visual angle transition mode is inserted between the wide visual angle mode and the narrow visual angle mode, so that the wide visual angle mode and the narrow visual angle mode are switched more naturally, the arrangement based on the principle of optimizing the image quality is realized, and the image quality defect caused by the reverse confusion of liquid crystal molecules during the switching of the wide visual angle mode and the narrow visual angle mode is prevented.
In the wide viewing angle mode, the narrow viewing angle mode and the viewing angle transition mode, the direct current common voltage Vcom is applied to the common electrode 221, the corresponding gray scale voltage is applied to the pixel electrode 222, a voltage difference is formed between the pixel electrode 222 and the common electrode 221, and a horizontal electric field is generated (E1 in fig. 5 and 6), so that the positive liquid crystal molecules deflect in the horizontal direction towards the direction parallel to the horizontal electric field, the gray scale voltage comprises 0-255 gray scale voltages, and when different gray scale voltages are applied to the pixel electrode 222, the pixel unit presents different brightness, so that different pictures are displayed, and normal display of the display device in the wide viewing angle mode, the narrow viewing angle mode and the viewing angle transition mode is realized.
Further, waveforms of the first ac voltage V21, the second ac voltage V22, the third ac voltage V23, the fourth ac voltage V24, and the fifth ac voltage V25 include triangular waves and square waves (fig. 14 to 16). The first ac voltage V21, the second ac voltage V22, the third ac voltage V23, the fourth ac voltage V24, and the fifth ac voltage V25 are all ac voltages that fluctuate up and down around the first dc common voltage V11, and the magnitudes of the first dc common voltage V11 and the second dc common voltage V12 are the same.
Example two
Fig. 18 is a schematic waveform diagram of a wide-narrow view switchable display panel in a wide view mode according to a second embodiment of the present invention. As shown in fig. 18, the display panel and the driving method for switching between wide and narrow viewing angles provided in the second embodiment of the present invention are substantially the same as those in the first embodiment (fig. 1 to 17), except that in the present embodiment, the display panel includes a wide viewing angle mode and a narrow viewing angle mode, and the viewing angle transition mode is not required.
In the narrow viewing angle mode, referring to fig. 15, the voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode is larger than a preset value, i.e., a strong vertical electric field is formed between the first viewing angle control electrode 111 and the second viewing angle control electrode, and the positive liquid crystal molecules of the first liquid crystal layer 13 are greatly deflected in the vertical direction, so that the brightness of the display device is reduced in the oblique viewing direction and the viewing angle is narrowed. Specifically, the first dc common voltage V11 is applied to the first viewing angle control electrode 111, the third ac voltage V23 is applied to the first electrode 121, the fourth ac voltage V24 is applied to the second electrode 122, and the magnitudes, periods, and polarities of the third ac voltage V23 and the fourth ac voltage V24 are the same. The vertical electric field formed by the first viewing angle control electrode 111 and the first electrode 121 is in the same direction as and overlaps with the vertical electric field formed by the first viewing angle control electrode 111 and the second electrode 122, so that there is a substantially strong vertical electric field between the first substrate 11 and the second substrate 12 (refer to E3 in fig. 6), and the positive liquid crystal molecules of the first liquid crystal layer 13 are greatly deflected in the vertical direction, so that the brightness of the display device is reduced in the oblique viewing direction and the viewing angle is narrowed. The first dc common voltage V11 is 0V, and the magnitudes of the first ac voltage V21 and the second ac voltage V22 may be 3-7V, preferably 5V, that is, the voltage difference between the first electrode 121 and the second electrode 122 is 0V at any time, so that the narrow viewing angle effect is optimal. The frequency of the first alternating voltage V21 and the second alternating voltage V22 is 60Hz-200Hz, preferably 140Hz.
As shown in fig. 18, the voltage difference between the first viewing angle control electrode 111 and the second viewing angle control electrode is smaller than a preset value, i.e., a vertical electric field is not substantially formed between the first viewing angle control electrode 111 and the second viewing angle control electrode, and the positive liquid crystal molecules of the first liquid crystal layer 13 are not substantially deflected in the vertical direction and remain in an initial state. Specifically, the first dc common voltage V11 is applied to the first viewing angle control electrode 111, the first ac voltage V21 is applied to the first electrode 121, the second ac voltage V22 is applied to the second electrode 122, the first ac voltage V21 and the second ac voltage V22 have the same period and opposite polarities, and the magnitude of the first ac voltage V21 is smaller than the magnitude of the second ac voltage V22. That is, the voltage difference between the first ac voltage V21 and the first dc common voltage V11 and the voltage difference between the second ac voltage V22 and the first dc common voltage V11 cancel each other, and the vertical electric field formed by the first viewing angle control electrode 111 and the first electrode 121 and the vertical electric field formed by the first viewing angle control electrode 111 and the second electrode 122 are opposite in direction and cancel each other, so that a small vertical electric field or no vertical electric field is formed between the first substrate 11 and the second substrate 12, thereby displaying from a wide viewing angle. And a certain horizontal electric field is formed between the first electrode 121 and the second electrode 122 (refer to E2 in fig. 5), so that the positive liquid crystal molecules of the first liquid crystal layer 13 are deflected in a horizontal direction, thereby further reducing color shift. Wherein the first dc common voltage V11 is 0V, and the amplitude of the first ac voltage V21 may be 4-8V, preferably 5V. The magnitude of the second ac voltage V22 may be 6-13V, preferably 8V, and since the polarities of the first ac voltage V21 and the second ac voltage V22 are opposite, the magnitude of the voltage difference between the first electrode 121 and the second electrode 122 is 13V at any time, so that the wide viewing angle effect is optimal. The frequency of the first alternating voltage V21 and the second alternating voltage V22 is 60Hz-200Hz, preferably 140Hz. Of course, the magnitudes of the first ac voltage V21 and the second ac voltage V22 may be the same.
In the present embodiment, the first ac voltage V21 and the second ac voltage V22 take a stepped waveform at a wide viewing angle. As shown in fig. 18, each Frame (Frame) is divided into six segments, and the voltage between adjacent two segments is stepped. For example, the first ac voltage V21 is 1V in the first section t1, 1V in the second section t2, 5V in the third section t3, 1V in the fourth section t4, 1V in the fifth section t5, and 5V in the sixth section t 6. The second alternating voltage V22 is-5V in the first section t1, 5V in the second section t2, 8V in the third section t3, 5V in the fourth section t4, 5V in the fifth section t5, and 8V in the sixth section t 6. Therefore, the magnitude of the voltage difference between the first ac voltage V21 and the second ac voltage V22 is 6V in the first section t1, 6V in the second section t2, 13V in the third section t3, 6V in the fourth section t4, 6V in the fifth section t5, and 13V in the sixth section t 6. Therefore, the time length of the maximum pressure difference of 13V is 1/3, and the problem of uneven display caused by overlarge pressure difference change in the switching process of the wide-view mode and the narrow-view mode can be effectively solved. Therefore, when the wide viewing angle mode is adopted, the first alternating voltage V21 and the second alternating voltage V22 both adopt stepped waves, so that the viewing angle transition mode is not required to be inserted in the switching process of the wide viewing angle mode and the narrow viewing angle mode. In addition, a step waveform design is reserved in a wide-view mode, and the frequency and the amplitude of the step waveform are adjustable, so that the problem of insufficient charging caused by large load is prevented. Of course, according to practical needs, the step wave can also be divided into multiple segments, such as three segments, four segments, eight segments, etc., in each frame.
Those skilled in the art will understand that the other structures and working principles of the present embodiment are the same as those of the first embodiment, and will not be described herein.
Fig. 19 and 20 are schematic plan views of a display device according to the present invention, please refer to fig. 19 and 20, wherein the display device is provided with a viewing angle switching key 50 for a user to send a viewing angle switching request to the display device. The view angle switching key 50 may be a physical key (as shown in fig. 19), or may be a software control or Application (APP) to implement a switching function (as shown in fig. 20, for example, a slider bar to set a wide and narrow view angle). When a user needs to switch between a wide viewing angle and a narrow viewing angle, a viewing angle switching request can be sent to the display device by operating the viewing angle switching key 50, and finally, the driving chip 60 controls the electric signals applied to the viewing angle control electrode 111, the first electrode 121 and the second electrode 122, so that the display device can realize the switching between the wide viewing angle and the narrow viewing angle.
In this document, terms such as up, down, left, right, front, rear, etc. are defined by the positions of the structures in the drawings and the positions of the structures with respect to each other, for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of such orientation terms should not limit the scope of the protection sought herein. It should also be understood that the terms "first" and "second," etc., as used herein, are used merely for distinguishing between names and not for limiting the number and order.
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (9)
1. A driving method of a display panel, characterized in that the display panel comprises a dimming box (10) and a display box (20) stacked with the dimming box (10); the light regulating box (10) comprises a first substrate (11), a second substrate (12) which is arranged opposite to the first substrate (11) and a first liquid crystal layer (13) which is arranged between the first substrate (11) and the second substrate (12), wherein a first polaroid (31) is arranged on the first substrate (11), a second polaroid (32) is arranged on the second substrate (12), a first light transmission axis (T1) of the first polaroid (31) is mutually perpendicular to a second light transmission axis (T2) of the second polaroid (32), a first visual angle control electrode (111) is arranged on one side of the first substrate (11) which faces the first liquid crystal layer (13), a second visual angle control electrode which is matched with the first visual angle control electrode (111) is arranged on one side of the first substrate (11) which faces the first liquid crystal layer (13), an acute angle is formed between the second substrate (12) and the first liquid crystal layer (1) which faces the second liquid crystal layer (13) in a first direction and the second direction (P) which faces the first direction (P) in a direction, the second direction (P) which faces the second direction (P) and the second direction (P) which is the first direction (P) which faces the first direction (P) and the second direction (P) which is the second direction (P) which faces the first direction (P) and the second direction (P) respectively, the projections of the first alignment direction (P1) and the second alignment direction (P2) on the second substrate (12) are parallel and in the same direction;
The display panel with switchable wide and narrow viewing angles comprises a wide viewing angle mode, a narrow viewing angle mode and a viewing angle transition mode, and the driving method comprises the following steps: when the wide view angle mode and the narrow view angle mode are switched, the view angle transition mode is inserted between the wide view angle mode and the narrow view angle mode;
in the wide viewing angle mode, a pressure difference between the first viewing angle control electrode (111) and the second viewing angle control electrode is less than a preset value;
in the narrow viewing angle mode, a pressure difference between the first viewing angle control electrode (111) and the second viewing angle control electrode is greater than a preset value;
in the viewing angle transition mode, a magnitude of a pressure difference between the first viewing angle control electrode (111) and the second viewing angle control electrode is between a pressure difference in the narrow viewing angle mode and a pressure difference in the wide viewing angle mode.
2. The driving method of a display panel according to claim 1, wherein the second viewing angle control electrode includes a first electrode (121) and a second electrode (122), the first electrode (121) includes a plurality of first electrode bars (121 a), the second electrode (122) includes a plurality of second electrode bars (122 a), and the first electrode bars (121 a) are parallel to the second electrode bars (122 a) and alternately arranged with each other;
In the wide viewing angle mode, a first direct current common voltage (V11) is applied to the first viewing angle control electrode (111), a first alternating current voltage (V21) is applied to the first electrode (121), a second alternating current voltage (V22) is applied to the second electrode (122), and the periods of the first alternating current voltage (V21) and the second alternating current voltage (V22) are the same and the polarities are opposite;
in the narrow viewing angle mode, a first direct current common voltage (V11) is applied to the first viewing angle control electrode (111), a third alternating current voltage (V23) is applied to the first electrode (121), a fourth alternating current voltage (V24) is applied to the second electrode (122), and the amplitude, period and polarity of the third alternating current voltage (V23) and the fourth alternating current voltage (V24) are the same;
in the viewing angle transition mode, a first direct current common voltage (V11) is applied to the first viewing angle control electrode (111), a second direct current common voltage (V12) is applied to the first electrode (121), a fifth alternating current voltage (V25) is applied to the second electrode (122), and the magnitude of the fifth alternating current voltage (V25) is greater than the magnitude of the fourth alternating current voltage (V24) and less than the magnitude of the second alternating current voltage (V22).
3. The method of driving a display panel according to claim 2, wherein the projection of the first electrode stripe (121 a) and the second electrode stripe (122 a) on the second substrate (12) forms an angle of 0-7 ° with the projection of the first alignment direction (P1) on the second substrate (12).
4. A driving method of a display panel, characterized in that the display panel comprises a dimming box (10) and a display box (20) stacked with the dimming box (10); the light regulating box (10) comprises a first substrate (11), a second substrate (12) which is arranged opposite to the first substrate (11) and a first liquid crystal layer (13) which is arranged between the first substrate (11) and the second substrate (12), wherein a first polaroid (31) is arranged on the first substrate (11), a second polaroid (32) is arranged on the second substrate (12), a first light transmission axis (T1) of the first polaroid (31) is mutually perpendicular to a second light transmission axis (T2) of the second polaroid (32), a first visual angle control electrode (111) is arranged on one side of the first substrate (11) which faces the first liquid crystal layer (13), a second visual angle control electrode which is matched with the first visual angle control electrode (111) is arranged on one side of the first substrate (11) which faces the first liquid crystal layer (13), an acute angle is formed between the second substrate (12) and the first liquid crystal layer (1) which faces the second liquid crystal layer (13) in a first direction and the second direction (P) which faces the first direction (P) in a direction, the second direction (P) which faces the second direction (P) and the second direction (P) which is the first direction (P) which faces the first direction (P) and the second direction (P) which is the second direction (P) which faces the first direction (P) and the second direction (P) respectively, the projections of the first alignment direction (P1) and the second alignment direction (P2) on the second substrate (12) are parallel and in the same direction;
The wide-and-narrow viewing angle switchable display panel includes a wide viewing angle mode and a narrow viewing angle mode, the second viewing angle control electrode includes a first electrode (121) and a second electrode (122), the first electrode (121) includes a plurality of first electrode bars (121 a), the second electrode (122) includes a plurality of second electrode bars (122 a), and the first electrode bars (121 a) are parallel to the second electrode bars (122 a) and alternately arranged with each other;
the driving method comprises the following steps: in the wide viewing angle mode, a first direct current common voltage (V11) is applied to the first viewing angle control electrode (111), a first alternating current voltage (V21) is applied to the first electrode (121), a second alternating current voltage (V22) is applied to the second electrode (122), the periods of the first alternating current voltage (V21) and the second alternating current voltage (V22) are the same and the polarities of the first alternating current voltage (V21) and the second alternating current voltage (V22) are opposite, and the first alternating current voltage (V21) and the second alternating current voltage (V22) adopt stepped waves;
in the narrow viewing angle mode, a first direct current common voltage (V11) is applied to the first viewing angle control electrode (111), a third alternating current voltage (V23) is applied to the first electrode (121), a fourth alternating current voltage (V24) is applied to the second electrode (122), and the magnitudes, periods and polarities of the third alternating current voltage (V23) and the fourth alternating current voltage (V24) are the same.
5. The method according to claim 4, wherein the projection of the first electrode stripe (121 a) and the second electrode stripe (122 a) on the second substrate (12) forms an angle of 0-7 ° with the projection of the first alignment direction (P1) on the second substrate (12).
6. The driving method of a display panel according to claim 1 or 4, wherein an angle formed between the first alignment direction (P1) and the first substrate (11) is α1, and an angle formed between the second alignment direction (P2) and the second substrate (12) is α2, wherein 0< α2= - α 1<7 °.
7. The driving method of a display panel according to claim 1 or 4, wherein the first alignment direction (P1) forms an angle θ1 with the projection of the first transmission axis (T1) on the second substrate (12), and the second alignment direction (P2) forms an angle θ2 with the projection of the first transmission axis (T1) on the second substrate (12), wherein 30 ° < θ1=θ2<60 °.
8. The driving method of a display panel according to claim 1 or 4, wherein the display box (20) comprises a color film substrate (21), an array substrate (22) disposed opposite to the color film substrate (21), and a second liquid crystal layer (23) disposed between the color film substrate (21) and the array substrate (22), a third polarizer (33) is disposed on a side of the display box (20) away from the light-adjusting box (10), and a light transmission axis of the polarizer between the light-adjusting box (10) and the display box (20) is perpendicular to a light transmission axis of the third polarizer (33).
9. A display device comprising a display panel driven by the driving method of the display panel according to any one of claims 1 to 8.
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2021
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| CN101023392A (en) * | 2004-06-26 | 2007-08-22 | 香港科技大学 | An Improved Polyimide Cell Liquid Crystal Display |
| JP2006064882A (en) * | 2004-08-25 | 2006-03-09 | Sharp Corp | Display device, viewing angle control device, electronic device |
| JP2008064790A (en) * | 2006-09-04 | 2008-03-21 | Sharp Corp | Display, and viewing angle controller used therefor |
| JP2008096458A (en) * | 2006-10-05 | 2008-04-24 | Sharp Corp | Display and viewing angle controller to be used for the same |
| CN213023865U (en) * | 2020-10-13 | 2021-04-20 | 昆山龙腾光电股份有限公司 | Display panel with switchable wide and narrow viewing angles and display device |
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| CN114415401A (en) | 2022-04-29 |
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