CN114545664B - Peep-proof panel, display device and control method of peep-proof panel - Google Patents
Peep-proof panel, display device and control method of peep-proof panel Download PDFInfo
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- CN114545664B CN114545664B CN202011332226.3A CN202011332226A CN114545664B CN 114545664 B CN114545664 B CN 114545664B CN 202011332226 A CN202011332226 A CN 202011332226A CN 114545664 B CN114545664 B CN 114545664B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1323—Arrangements for providing a switchable viewing angle
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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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
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
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- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides a peep-proof panel, a display device and a control method thereof, and relates to the technical field of display. The peep-proof panel comprises a first substrate, a second substrate and a liquid crystal layer; the first substrate comprises a first substrate and a first polarization unit; the second substrate comprises a second substrate and a second polarization unit; the transmission axis of the first polarization unit is parallel to the transmission axis of the second polarization unit; the included angle between the transmission axis of the first polarization unit and the first substrate is a first included angle, the included angle between the transmission axis of the second polarization unit and the second substrate is a second included angle, and the first included angle and the second included angle are the same and are acute angles; the liquid crystal layer is configured to be capable of changing a polarization direction of light directed to the second substrate in the peep-proof state, and not to change the polarization direction of light directed to the second substrate in the non-peep-proof state. The invention is suitable for manufacturing the peep-proof panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a peep-proof panel, a display device and a control method thereof.
Background
Along with the development of technology, the peep-proof function is applied to various display devices, such as a bank cash dispenser, a high-end peep-proof notebook, and the like, so as to prevent information leakage.
However, the current display device with the peep-proof function can only realize peep-proof in the horizontal direction, and the display device cannot realize peep-proof in the vertical direction, so that the peep-proof effect is poor.
Disclosure of Invention
The embodiment of the invention provides a peep-proof panel, a display device and a control method thereof, wherein when the peep-proof panel is applied to the display device, the display device can realize peep prevention in the horizontal direction and the vertical direction at the same time, so that the peep-proof effect is improved.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical scheme:
in one aspect, a peep-proof panel, a display device and a control method thereof are provided, wherein the peep-proof panel is applied to the display device, and the display device comprises a display panel; the peep-proof panel is positioned on the light-emitting side of the display panel; the peep-proof panel comprises a first substrate, a second substrate and a liquid crystal layer; the liquid crystal layer is positioned between the first substrate and the second substrate; light rays emitted by the display panel sequentially pass through the first substrate and the liquid crystal layer and are emitted to the second substrate;
the first substrate comprises a first substrate and a first polarization unit positioned on one side of the first substrate far away from the liquid crystal layer; the second substrate comprises a second substrate and a second polarization unit positioned on one side of the second substrate far away from the liquid crystal layer; the transmission axis of the first polarization unit is parallel to the transmission axis of the second polarization unit; the included angle between the transmission axis of the first polarization unit and the first substrate is a first included angle, the included angle between the transmission axis of the second polarization unit and the second substrate is a second included angle, and the first included angle and the second included angle are the same and are acute angles;
the liquid crystal layer is configured to be capable of changing a polarization direction of light directed to the second substrate in a peep-proof state, and not to change the polarization direction of light directed to the second substrate in a non-peep-proof state.
Optionally, the acute angle is in the range of 40-50 °.
Optionally, the first substrate further includes a first alignment film located on a side of the first substrate close to the liquid crystal layer; the second substrate further comprises a second alignment film positioned on one side of the second substrate close to the liquid crystal layer;
the peep-proof panel also comprises a first electrode and a second electrode;
the first alignment film and the second alignment film are configured to co-act so that a short axis of liquid crystal of the liquid crystal layer is parallel to the first substrate in a case where the first electrode and the second electrode do not generate an electric field, so that the peep-preventing panel is in a peep-preventing state;
the first electrode and the second electrode are configured to generate an electric field such that a short axis of liquid crystal of the liquid crystal layer is parallel to a transmission axis of the first polarizing unit, so that the peep-proof panel is in a non-peep-proof state.
Optionally, the first electrode and the second electrode are both located on the same side of the liquid crystal layer; the liquid crystal layer includes a positive liquid crystal.
Optionally, the first electrode and the second electrode are respectively located at two opposite sides of the liquid crystal layer; the liquid crystal layer includes a negative liquid crystal.
Optionally, the first polarizing unit includes a first polarizer; the second polarizing unit includes a second polarizer.
Alternatively, the liquid crystal layer has a liquid crystal phase retardation in the range of 850-1200nm.
In another aspect, a display device is provided, including the privacy panel and the display panel described above;
the peep-proof panel is positioned on the light emitting side of the display panel.
Optionally, the peep-proof panel includes a first electrode and a second electrode;
the display device further comprises a control module which is respectively and electrically connected with the first electrode and the second electrode; the control module is configured to provide a control voltage to the first electrode and the second electrode such that a short axis of liquid crystal of a liquid crystal layer of the privacy panel is parallel to a transmission axis of a first polarizing unit of the privacy panel.
Optionally, the control module is disposed on the display panel or the peep-proof panel.
In still another aspect, a control method of a display device is provided, the privacy panel including a first electrode, a second electrode, and a liquid crystal layer; the display device comprises a control module; the control module is respectively and electrically connected with the first electrode and the second electrode;
the control method comprises the following steps:
opening the control module to provide control voltage to the first electrode and the second electrode, so that the short axis of liquid crystal of the liquid crystal layer is parallel to the transmission axis of the first polarization unit, and the peep-proof panel is in a non-peep-proof state;
and closing the control module to enable the peep-proof panel to be switched from a non-peep-proof state to a peep-proof state.
The embodiment of the invention provides a peep-proof panel which is applied to a display device, wherein the display device comprises a display panel; the peep-proof panel is positioned on the light-emitting side of the display panel; the peep-proof panel comprises a first substrate, a second substrate and a liquid crystal layer; the liquid crystal layer is positioned between the first substrate and the second substrate; light emitted by the display panel sequentially passes through the first substrate and the liquid crystal layer and is emitted to the second substrate; the first substrate comprises a first substrate and a first polarization unit positioned on one side of the first substrate far away from the liquid crystal layer; the second substrate comprises a second substrate and a second polarization unit positioned on one side of the second substrate far away from the liquid crystal layer; the transmission axis of the first polarization unit is parallel to the transmission axis of the second polarization unit; the included angle between the transmission axis of the first polarization unit and the first substrate is a first included angle, the included angle between the transmission axis of the second polarization unit and the second substrate is a second included angle, and the first included angle and the second included angle are the same and are acute angles; the liquid crystal layer is configured to be capable of changing a polarization direction of light directed to the second substrate in the peep-proof state, and not to change the polarization direction of light directed to the second substrate in the non-peep-proof state.
In this way, the peep-proof panel is applied to the display device, on one hand, the display device can have a peep-proof state and a non-peep-proof state by controlling the liquid crystal layer; on the other hand, under the condition of being in the peep-proof state, through the combined action of the first polarization unit, the liquid crystal layer and the second polarization unit, the peep-proof of the display device in the horizontal direction and the vertical direction can be simultaneously realized, so that the peep-proof effect is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of a liquid crystal cell according to an embodiment of the present invention;
FIG. 2 is a left side view of the liquid crystal cell of FIG. 1;
FIG. 3 is a 45 view of the liquid crystal cell of FIG. 1;
in fig. 4, a is a view transmittance distribution diagram of the liquid crystal cell shown in fig. 1 applied to a display device, and b is a three-dimensional perspective view corresponding to a;
fig. 5 is a front view of a display device in a peep-proof state according to an embodiment of the present invention;
FIG. 6 is a view transmittance distribution diagram of the display device shown in FIG. 5 in a peep-proof state;
fig. 7 is a front view of a display device in a non-peep-proof state according to an embodiment of the present invention;
FIG. 8 is a view transmittance distribution diagram of the display device shown in FIG. 7 in a non-peeping state;
fig. 9 is a voltage waveform diagram according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the embodiments of the present invention, the words "first," "second," and the like are used to distinguish between the same item or similar items that have substantially the same function and function, and are merely used to clearly describe the technical solutions of the embodiments of the present invention, and are not to be construed as indicating or implying relative importance or implying that the number of technical features indicated is indicated.
In the embodiments of the present invention, the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description and simplification of description, and are not indicative or implying that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
The following first describes the design principle of the peep-proof panel provided by the embodiment of the invention.
The liquid crystal can change the polarization direction of the light, and specifically, if the light entering the liquid crystal is parallel to the short axis or the long axis of the refractive index ellipsoid of the liquid crystal, the polarization direction of the light after exiting the liquid crystal is not changed; if the light entering the liquid crystal is not parallel to the short axis or long axis of the refractive index ellipsoid of the liquid crystal, the polarization direction of the light after exiting the liquid crystal is changed.
Fig. 1 shows a front view of a liquid crystal cell, in fig. 1, the liquid crystal cell 1 includes a lower polarizing unit 11, a liquid crystal layer 12 and an upper polarizing unit 13, and the liquid crystal layer 12 includes a liquid crystal 121, a liquid crystal 122 and a liquid crystal 123, wherein refractive index ellipsoids of the liquid crystal 121, the liquid crystal 122 and the liquid crystal 123 are respectively marked as 121', 122', 123', and the sizes and states of the liquid crystal 121, the liquid crystal 122 and the liquid crystal 123 are the same. The liquid crystal 121, 122, 123 are in a standing state. The transmission axis L1 of the lower polarizing unit 11 and the transmission axis L2 of the upper polarizing unit 13 are parallel to the short axis d1 of the liquid crystal 121, the short axis d2 of the liquid crystal 122, and the short axis d3 of the liquid crystal 123, and the transmission axis L1 of the lower polarizing unit 11 and the transmission axis L2 of the upper polarizing unit 13 are both horizontally transmitted, that is, light in the horizontal direction can pass through the lower polarizing unit 11. The light emitted by the light source passes through the lower polarization unit 11 and then is emitted through the liquid crystal 121, the liquid crystal 122 and the liquid crystal 123, wherein the light emitted through the liquid crystal 121, the liquid crystal 122 and the liquid crystal 123 is respectively denoted by k1, k2 and k3.
The polarization direction of the light directed to the liquid crystal 121 is parallel to the short axis of the index ellipsoid of the liquid crystal 121, so that the light passes through the liquid crystal layer without changing the polarization state, and thus the light k1 can be emitted through the upper polarization unit 13. The polarization direction of the light directed to the liquid crystal 122 is parallel to the short axis of the index ellipsoid of the liquid crystal 122, so that the light passes through the liquid crystal layer without changing the polarization state, and thus the light k2 can be emitted through the upper polarization unit 13. The polarization direction of the light directed to the liquid crystal 123 is parallel to the short axis of the index ellipsoid of the liquid crystal 123, so that the light passes through the liquid crystal layer without changing the polarization state, and thus the light k3 can be emitted through the upper polarization unit 13.
Fig. 2 shows a left side view of the above-described liquid crystal cell. Referring to fig. 2, the liquid crystals 121, 122 and 123 are all the same in size and state, the transmission axis L1 of the lower polarizing unit 11 and the transmission axis L2 of the upper polarizing unit 13 are perpendicular to the short axis d1 of the liquid crystals 121, the short axis d2 of the liquid crystals 122 and the short axis d3 of the liquid crystals 123, and the transmission axis L1 of the lower polarizing unit 11 and the transmission axis L2 of the upper polarizing unit 13 are perpendicular to the paper surface. The light emitted by the light source passes through the lower polarization unit 11 and then is emitted through the liquid crystal 121, the liquid crystal 122 and the liquid crystal 123, wherein the light emitted through the liquid crystal 121, the liquid crystal 122 and the liquid crystal 123 is respectively denoted by k1, k2 and k3.
The polarization direction of the light directed to the liquid crystal 121 is parallel to the long axis of the index ellipsoid of the liquid crystal 121, so that the light passes through the liquid crystal layer without changing the polarization state, and thus the light k1 can be emitted through the upper polarization unit 13. The polarization direction of the light directed to the liquid crystal 122 is parallel to the long axis of the index ellipsoid of the liquid crystal 122, so that the light passes through the liquid crystal layer without changing the polarization state, and thus the light k2 can be emitted through the upper polarization unit 13. The polarization direction of the light directed to the liquid crystal 123 is parallel to the long axis of the index ellipsoid of the liquid crystal 123, so that the light passes through the liquid crystal layer without changing the polarization state, and thus the light k3 can be emitted through the upper polarization unit 13.
Fig. 3 shows a 45 view of the above-described liquid crystal cell. Referring to fig. 3, the liquid crystals 121, 122 and 123 are all the same in size and state, and the transmission axis L1 of the lower polarizing unit 11 and the transmission axis L2 of the upper polarizing unit 13 are each 45 ° from the short axis d1 of the liquid crystals 121, the short axis d2 of the liquid crystals 122 and the short axis d3 of the liquid crystals 123. The light passes through the lower polarization unit 11 to be respectively a light a directed to the liquid crystal 121, a light b directed to the liquid crystal 122, and a light c directed to the liquid crystal 123. Since the angle between the polarization direction of the light ray a and the short axis of the refractive index ellipsoid of the liquid crystal 121 is 45 °, the polarization direction of the light ray a is changed after passing through the liquid crystal 121, and the light ray a cannot be emitted from the upper polarization unit 13. Since the polarization direction of the light b (not shown in fig. 3) is parallel to the short axis of the index ellipsoid of the liquid crystal 122, the light k can be emitted from the upper polarization unit 13 without changing the polarization direction after the light b passes through the liquid crystal 122. Since the angle between the polarization direction of the light ray c and the short axis of the refractive index ellipsoid of the liquid crystal 123 is 45 °, the polarization direction of the light ray c changes after passing through the liquid crystal 123, and the light ray c cannot be emitted from the upper polarization unit 13.
In fig. 4, a illustrates a view transmittance distribution diagram of a display device after the above-described liquid crystal cell is applied to the display device; b is a three-dimensional graph corresponding to a, wherein 0-360 degrees marked around the circle in the a corresponds to angles in the bThe angles theta in the b graph correspond to 0-90 degrees marked on a plurality of circular rings in the a graph; the xy plane represents the plane in which the display device is located, the xz plane and the yz plane represent the planes of the display device perpendicular to the xy plane, +.>And θ represents the observation angle. Referring to the a-chart in fig. 4, when the display device is seen from 45 °, 135 °, 225 ° and 315 °, the picture is not seen substantially, and the picture can be seen from other angles.
The liquid crystal 121, the liquid crystal 122, and the liquid crystal 123 described above are not single liquid crystals, but equivalent liquid crystals of all liquid crystals through which one light passes.
When the user is located right in front of the display panel, the position of the user is the front position of the display panel, and at this time, the viewing angle of the user is the front viewing angle, and the front viewing angle of the user is a front view of the display panel. When the user is positioned at the left side and the right side of the display panel, the position of the user is the left side and the right side of the display panel, at the moment, the viewing angles of the user are the left viewing angle and the right viewing angle, and the left viewing angle and the right viewing angle of the user are the left view and the right view. When the user is positioned on the upper side and the lower side of the display panel, the position of the user is the upper side and the lower side of the display panel, at the moment, the visual angle of the user is the upper visual angle and the lower visual angle, and the upper visual angle and the lower visual angle of the user are the upper view and the lower view.
Based on the above theory, the embodiment of the present invention provides a peep-proof panel, referring to fig. 5, the peep-proof panel 2 is applied to a display device, and the display device includes a display panel 3; the peep-proof panel 2 is positioned on the light-emitting side of the display panel 3; the peep-proof panel 2 includes a first substrate 21, a second substrate 23, and a liquid crystal layer 22; the liquid crystal layer 22 is located between the first substrate 21 and the second substrate 23; the light emitted from the display panel 3 sequentially passes through the first substrate 21 and the liquid crystal layer 22, and is directed to the second substrate 23.
The first substrate 21 includes a first substrate 211, and a first polarizing unit 212 located on a side of the first substrate 211 away from the liquid crystal layer 22; the second substrate 23 includes a second substrate 231, and a second polarizing unit 232 located at a side of the second substrate 231 remote from the liquid crystal layer 22; the transmission axis L1 of the first polarization unit 212 and the transmission axis L2 of the second polarization unit 232 are parallel; the included angle between the transmission axis L1 of the first polarization unit 212 and the first substrate 211 is a first included angle θ1, the included angle between the transmission axis L1 of the second polarization unit 232 and the second substrate 231 is a second included angle θ2, and the first and second included angles θ1 and θ2 are the same and are acute angles.
The liquid crystal layer 22 is configured to be able to change the polarization direction of light directed to the second substrate 23 in the peep-proof state, and not to change the polarization direction of light directed to the second substrate 23 in the non-peep-proof state.
The peep-proof panel is positioned on the light emitting side of the display panel, so that light rays emitted by the display panel sequentially pass through the first substrate and the liquid crystal layer and are emitted to the second substrate. When light rays are emitted to the second substrate and then can be emitted from the second substrate, the peep-proof panel cannot realize the peep-proof effect; when light rays are emitted to the second substrate, the light rays cannot be emitted from the second substrate, and at the moment, the peep-proof panel can achieve the peep-proof effect.
The included angle between the transmission axis of the first polarization unit and the first substrate is a first included angle, the included angle between the transmission axis of the second polarization unit and the second substrate is a second included angle, and the first included angle and the second included angle are the same and are acute angles. Specific values of the first angle and the second angle are not limited herein. For example, the acute angle may include 20 °, 40 °, 60 °, 80 °.
The display device includes a display panel, which may include a liquid crystal display panel, or may include an Organic Light-Emitting Diode (OLED) display panel, which is not particularly limited herein.
The first substrate comprises a first substrate and a first polarization unit positioned on one side of the first substrate far away from the liquid crystal layer; the second substrate comprises a second substrate and a second polarization unit positioned on one side of the second substrate far away from the liquid crystal layer. The material of the first substrate and the second substrate is not particularly limited here. By way of example, the materials of both the first and second substrates may comprise glass, PI (polyimide). The materials and types of the first polarizing unit and the second polarizing unit are not particularly limited. By way of example, the materials of the first and second polarization units may each include PVA (polyvinyl alcohol), PVC (polyvinyl chloride); the types of the first polarizing unit and the second polarizing unit may each include a linear polarizer, a grating.
Thus, after the peep-proof panel provided by the embodiment is applied to the display device, when the display device is in the peep-proof state, the display device is seen from the left side and the right side of the display device along the horizontal direction and from the upper side and the lower side of the display device along the vertical direction, the light transmittance is very low, and the display picture is basically not seen; when the display device is viewed from the other side, the light transmittance increases, and the display screen can be seen. When the display device is in a non-peeping state, the display picture can be seen from the upper, lower, left, right and other directions of the display device, and the peeping-preventing panel is not peeping-preventing at the moment.
In the case of peep prevention, for example, referring to fig. 5, the liquid crystal is in a standing state, and refractive index ellipsoids of the liquid crystal 121, 122, 123 are respectively labeled as 121', 122', 123'. The light emitted from the display panel 1 passes through the first substrate 21, and then becomes light a directed to the liquid crystal 121, light b directed to the liquid crystal 122, and light c directed to the liquid crystal 123, respectively. Since the angle between the polarization direction of the light ray a and the short axis of the refractive index ellipsoid of the liquid crystal 121 is acute, the polarization direction of the light ray a changes after passing through the liquid crystal 121, and the light ray a cannot be emitted from the second substrate 23. Since the polarization direction of the light b (not shown in fig. 5) is parallel to the short axis of the index ellipsoid of the liquid crystal 122, the light k can be emitted from the second substrate 23 without changing the polarization direction after the light b passes through the liquid crystal 122. Since the angle between the polarization direction of the light ray c and the short axis of the refractive index ellipsoid of the liquid crystal 123 is acute, the polarization direction of the light ray c changes after passing through the liquid crystal 123, and the light ray c cannot be emitted from the second substrate 23.
Fig. 6 is a view transmittance distribution diagram of the corresponding display device in the peep-proof state when the first included angle and the second included angle are both 45 °. As shown in reference to figure 6 of the drawings,direction or->The maximum light transmittance in the direction (i.e. 45 DEG direction), i.e. the transmission axis direction of the first and second polarization units is +.>Direction or->A direction; meanwhile, the light transmittance of the shadow part of four dark irregular circles in the upper, lower, left and right of FIG. 6 is the lowest, the display screen is basically not seen, and the part corresponds to +.>Light rays in directions of 0 °, 90 °, 180 ° and 270 °, respectively (i.e., corresponding to left and right side viewing angles in the horizontal direction, the vertical direction)Upper and lower side views of the display device), the display device has peep-proof effect in the left and right sides of the horizontal direction and the upper and lower sides of the vertical direction.
In the case of non-peeping, for example, referring to fig. 7, refractive index ellipsoids of the liquid crystal 121, the liquid crystal 122, and the liquid crystal 123 are denoted as 121', 122', 123', respectively. The liquid crystal falls down along the transmission axis direction of the first polarization unit, and at this time, the short axis of the liquid crystal is parallel to the transmission axis direction of the first polarization unit, so that the liquid crystal does not change the polarization state of the light. Therefore, the light emitted from the display panel 1 passes through the first substrate 21 and then is directed to the liquid crystal 121, the liquid crystal 122, and the liquid crystal 123, respectively, and finally the light k1, the light k2, and the light k3 are emitted from the second substrate. Fig. 8 is a view transmittance distribution diagram of the corresponding display device in a non-peep-proof state when the first included angle and the second included angle are both 45 °. Referring to FIG. 8, inDirection or->The viewing angle transmittance in the direction is the largest.
Therefore, the peep-proof panel is applied to the display device, and on one hand, the display device can have a peep-proof state and a non-peep-proof state by controlling the liquid crystal layer; on the other hand, under the condition of being in the peep-proof state, through the combined action of the first polarization unit, the liquid crystal layer and the second polarization unit, the peep-proof in the left and right directions on the horizontal direction of the display device and the upper and lower four directions on the vertical direction of the display device can be simultaneously realized, so that the peep-proof effect is greatly improved.
Optionally, the acute angle is in the range of 40-50 °. Therefore, the peep-proof panel does not influence the display of the display panel, and can play a good peep-proof role.
For example, the acute angle may be 40 °, 45 °, 50 °, and so on.
Optionally, the first substrate further includes a first alignment film located on a side of the first substrate close to the liquid crystal layer; the second substrate further comprises a second alignment film positioned on one side of the second substrate close to the liquid crystal layer; the peep-proof panel also comprises a first electrode and a second electrode; the first alignment film and the second alignment film are configured to co-act so that a short axis of liquid crystal of the liquid crystal layer is parallel to the first substrate in a case where the first electrode and the second electrode do not generate an electric field, so that the peep-preventing panel is in a peep-preventing state; the first electrode and the second electrode are configured to generate an electric field such that a short axis of liquid crystal of the liquid crystal layer is parallel to a transmission axis of the first polarizing unit, so that the peep-proof panel is in a non-peep-proof state.
In this way, in the presence of the first alignment film and the second alignment film, the peep-preventing panel can be switched between the peep-preventing state and the non-peep-preventing state by whether or not a voltage is applied to the first electrode and the second electrode.
Optionally, the first electrode and the second electrode are both located on the same side of the liquid crystal layer; the liquid crystal layer includes a positive liquid crystal. Because the rotation direction of the positive liquid crystal is parallel to the direction of the electric field, an electric field in the horizontal direction can be generated between the first electrode and the second electrode, and the electric field in the horizontal direction can control the short axis of the positive liquid crystal to be parallel to the transmission axis of the first polarization unit, so that the peep-proof panel is in a non-peep-proof state.
The material, shape, and position of the first electrode and the second electrode are not particularly limited. By way of example, the first electrode and the second electrode may each comprise a strip electrode made of metal. The first electrode and the second electrode may be located between the first substrate and the first alignment film, or may be located between the second substrate and the second alignment film, and fig. 5 illustrates that the first electrode 24 and the second electrode 25 are located between the first substrate 211 and the first alignment film 213.
Optionally, the first electrode and the second electrode are respectively located at two opposite sides of the liquid crystal layer; the liquid crystal layer includes a negative liquid crystal. Because the negative liquid crystal is arranged in the electric field in the direction perpendicular to the electric field, an electric field in the vertical direction can be generated between the first electrode and the second electrode, and the electric field in the vertical direction can control the short axis of the negative liquid crystal to be parallel to the transmission axis of the first polarization unit, so that the peep-proof panel is in a non-peep-proof state.
The material, shape, and position of the first electrode and the second electrode are not particularly limited. By way of example, the first electrode and the second electrode may each comprise a planar electrode made of metal. The first electrode may be located between the first substrate and the first alignment film, and the second electrode may be located between the second substrate and the second alignment film, or the first electrode may be located between the second substrate and the second alignment film, and the second electrode may be located between the first substrate and the first alignment film. Fig. 5 illustrates an example in which the first electrode 24 is located between the first substrate 211 and the first alignment film 213, and the second electrode 25 is located between the second substrate 231 and the second alignment film 233.
Optionally, the first polarizing unit includes a first polarizer; the second polarizing unit includes a second polarizer.
The materials and shapes of the first polarizer and the second polarizer are not particularly limited. For example, the first polarizer and the second polarizer may each include a planar film made of PVA (Polyvinyl Alcohol ).
Alternatively, the liquid crystal layer has a liquid crystal phase retardation in the range of 850-1200nm. Thus, the peep-proof effect of the peep-proof panel is best.
The phase retardation is a phase retardation generated by deflection of the phase of light when the light passes through the liquid crystal, and the phase retardation is calculated by the following formula:wherein λ represents the liquid crystal thickness, ">Indicating the angle of observation. When the light measurement angle is fixed, different phase retardation amounts can be obtained by changing lambda.
By way of example, the phase retardation may take the values of 900nm, 1000nm, 1100nm, 1200nm, etc.
In another aspect, a display device is provided, including the privacy panel and the display panel described above; the peep-proof panel is positioned on the light-emitting side of the display panel.
The display device may be a flexible display device (also called a flexible screen), or may be a rigid display device (i.e., a display device that cannot be bent), and is not limited thereto. The display device can be a liquid crystal display device or an OLED display device, and can also be any product or component with peep-proof function and display function, such as a television, a digital camera, a mobile phone, a tablet computer, a bank cash dispenser, a monitor, a vehicle-mounted display and the like, comprising the display devices. The display device has the advantages of good peep-proof effect, good display effect, long service life, high stability, high contrast ratio and the like.
Optionally, the privacy panel includes a first electrode and a second electrode.
The display device also comprises a control module which is respectively and electrically connected with the first electrode and the second electrode; the control module is configured to provide a control voltage to the first electrode and the second electrode such that a short axis of liquid crystal of the liquid crystal layer of the privacy panel is parallel to a transmission axis of the first polarizing unit of the privacy panel.
The peep-proof panel includes a first electrode and a second electrode, and the materials, shapes and positions of the first electrode and the second electrode are not particularly limited. By way of example, the first electrode and the second electrode may each be a planar electrode made of metal, and fig. 5 is a schematic diagram of the first electrode 24 and the second electrode 25 each being a planar electrode. The first electrode and the second electrode may be respectively located at two opposite sides of the liquid crystal layer, or may be both located at the same side of the liquid crystal layer.
The control module is configured to provide a control voltage to the first electrode and the second electrode such that a short axis of liquid crystal of the liquid crystal layer of the privacy panel is parallel to a transmission axis of the first polarizing unit of the privacy panel. In this way, referring to fig. 7, the liquid crystal is not in a vertical state any more, but in an inclined state, the short axis of the liquid crystal is parallel to the transmission axis of the first polarizing unit, and after the light emitted from the display panel 3 sequentially passes through the first polarizing unit 212, the first substrate 211, and the liquid crystal layer 22, the polarization direction of the light is not changed, so that the light can be emitted from the second substrate 231 when the light is redirected to the second substrate 231.
Optionally, the control module is disposed on the display panel or the peep-proof panel.
The position of the control module on the display panel or the privacy panel is not particularly limited herein. By way of example, the display panel may include an FPC (Flexible Printed Circuit, flexible circuit board) and the control module may be integrated on the FPC. Alternatively, the control module may be disposed on the first substrate or the second substrate of the privacy panel.
In still another aspect, a control method of a display device is provided, where a peep-proof panel includes a first electrode, a second electrode, and a liquid crystal layer; the display device comprises a control module; the control module is electrically connected with the first electrode and the second electrode respectively.
The control method comprises the following steps:
s1, opening a control module, and providing control voltage for a first electrode and a second electrode, so that the short axis of liquid crystal of a liquid crystal layer is parallel to the transmission axis of a first polarization unit, and the peep-proof panel is in a non-peep-proof state.
The above-described supply of the control voltage to the first electrode and the second electrode is not particularly limited in terms of the type and the magnitude of the control voltage. By way of example, the control voltage may include a square wave voltage as shown in fig. 9, which may have a magnitude of ±10 to ±12v.
Thus, the control module provides a control voltage to the first electrode and the second electrode, and an electric field is generated between the first electrode and the second electrode. At this time, the liquid crystal layer is under the combined action of the first alignment film and the second alignment film and the electric field force of the first electrode and the second electrode, and the short axis of the liquid crystal is parallel to the transmission axis of the first polarization unit under the action of the electric field force, so that the peep-proof panel is in a non-peep-proof state.
S2, closing the control module to enable the peep-proof panel to be switched from a non-peep-proof state to a peep-proof state. .
In this way, the control module is turned off and no control voltage is supplied to the first electrode and the second electrode, and no electric field is generated between the first electrode and the second electrode. At this time, the first alignment film and the second alignment film work together so that the short axis of the liquid crystal layer is parallel to the first substrate, so that the peep-proof panel is in a peep-proof state.
It should be noted that, the step S1 and the step S2 may be performed simultaneously; or executing the step S1 firstly and then executing the step S2; alternatively, step S2 is performed first, and then step S1 is performed.
The structural description of the display device in the embodiments of the present invention may refer to the above embodiments, and will not be repeated here.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The peep-proof panel is characterized by being applied to a display device, wherein the display device comprises a display panel; the peep-proof panel is positioned on the light-emitting side of the display panel; the peep-proof panel comprises a first substrate, a second substrate and a liquid crystal layer; the liquid crystal layer is positioned between the first substrate and the second substrate; light rays emitted by the display panel sequentially pass through the first substrate and the liquid crystal layer and are emitted to the second substrate;
the first substrate comprises a first substrate and a first polarization unit positioned on one side of the first substrate far away from the liquid crystal layer; the second substrate comprises a second substrate and a second polarization unit positioned on one side of the second substrate far away from the liquid crystal layer; the transmission axis of the first polarization unit is parallel to the transmission axis of the second polarization unit; the included angle between the transmission axis of the first polarization unit and the first substrate is a first included angle, the included angle between the transmission axis of the second polarization unit and the second substrate is a second included angle, and the first included angle and the second included angle are the same and are acute angles;
the liquid crystal layer is configured to be capable of changing the polarization direction of light rays emitted to the second substrate in a peep-proof state, and not changing the polarization direction of light rays emitted to the second substrate in a non-peep-proof state;
the acute angle is 40-50 degrees;
the first substrate further comprises a first alignment film positioned on one side of the first substrate close to the liquid crystal layer; the second substrate further comprises a second alignment film positioned on one side of the second substrate close to the liquid crystal layer;
the peep-proof panel also comprises a first electrode and a second electrode;
the first alignment film and the second alignment film are configured to co-act so that a short axis of liquid crystal of the liquid crystal layer is parallel to the first substrate in a case where the first electrode and the second electrode do not generate an electric field, so that the peep-preventing panel is in a peep-preventing state;
the first electrode and the second electrode are configured to generate an electric field such that a short axis of liquid crystal of the liquid crystal layer is parallel to a transmission axis of the first polarizing unit, so that the peep-proof panel is in a non-peep-proof state.
2. The privacy panel of claim 1, wherein the first electrode and the second electrode are both on the same side of the liquid crystal layer; the liquid crystal layer includes a positive liquid crystal.
3. The privacy panel of claim 1, wherein the first electrode and the second electrode are respectively positioned on opposite sides of the liquid crystal layer; the liquid crystal layer includes a negative liquid crystal.
4. The privacy panel of claim 1, wherein the first polarizing unit comprises a first polarizer; the second polarizing unit includes a second polarizer.
5. The privacy panel of claim 1, wherein the amount of retardation of the liquid crystal layer is in the range of 850-1200nm.
6. A display device comprising the privacy panel of any one of claims 1-5 and a display panel;
the peep-proof panel is positioned on the light-emitting side of the display panel;
the peep-proof panel comprises a first electrode and a second electrode;
the display device further comprises a control module which is respectively and electrically connected with the first electrode and the second electrode; the control module is configured to provide a control voltage to the first electrode and the second electrode such that a short axis of liquid crystal of a liquid crystal layer of the privacy panel is parallel to a transmission axis of a first polarizing unit of the privacy panel.
7. The display device of claim 6, wherein the control module is disposed on the display panel or the privacy panel.
8. The control method of the display device according to any one of claims 6 to 7, wherein the peep-proof panel includes a first electrode, a second electrode, and a liquid crystal layer; the display device comprises a control module; the control module is respectively and electrically connected with the first electrode and the second electrode;
the control method comprises the following steps:
opening the control module to provide control voltage to the first electrode and the second electrode, so that the short axis of liquid crystal of the liquid crystal layer is parallel to the transmission axis of the first polarization unit, and the peep-proof panel is in a non-peep-proof state;
and closing the control module to enable the peep-proof panel to be switched from a non-peep-proof state to a peep-proof state.
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