Stereoscopic display device and working method thereof

Abstract

The invention provides a stereoscopic display device and a working method thereof, and belongs to the technical field of display. The stereoscopic display device comprises a display panel; the 3D grating is located on the light emitting side of the display panel; the liquid crystal unit is located on the light emitting side of the 3D grating, and the refractive index of the liquid crystal unit is adjustable; the human eye tracking system is arranged on the side of the display panel and is used for determining the visual angle of two eyes of a viewer when the viewer watches the display panel; and the control unit is used for adjusting the voltage for driving the liquid crystal in the liquid crystal unit to deflect according to the viewing angle of the eyes of the viewer when the viewer views the display panel so as to adjust the refractive index of the liquid crystal unit and change the direction of emergent light of the display panel. According to the embodiment of the invention, the stereoscopic display effect can be ensured.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a stereoscopic display device and a working method thereof. Background Art

[0002] With the rapid development of stereoscopic display technology, there is an increasing demand for stereoscopic display devices. Among the many technologies for realizing three-dimensional stereoscopic display, naked-eye stereoscopic display technology is highly favored in the field of three-dimensional stereoscopic display because it does not require viewers to use glasses.

[0003] At present, the main way to realize naked-eye stereoscopic display technology is to set a grating in front of the display panel to divide the pixel units of the display panel into odd-numbered columns of pixels and even-numbered columns of pixels in the horizontal direction, thereby providing two different images for the viewer's left and right eyes respectively, and then using the parallax effect of the viewer's left eye image and right eye image to form a depth of field, thereby producing a stereoscopic display effect.

[0004] The common problem with current naked-eye stereoscopic display is that when looking directly at the display panel, the stereoscopic image ghosting and crosstalk are minimal; but as the upward or downward viewing angle increases, the stereoscopic image ghosting will gradually increase, affecting the stereoscopic viewing effect. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a stereoscopic display device and a working method thereof, which can ensure the stereoscopic display effect.

[0006] To solve the above technical problems, the embodiments of the present invention provide the following technical solutions:

[0007] In one aspect, a stereoscopic display device is provided, comprising:

[0008] Display panel;

[0009] A 3D grating located on the light-emitting side of the display panel;

[0010] A liquid crystal unit located at the light-emitting side of the 3D grating, wherein the refractive index of the liquid crystal unit is adjustable;

[0011] An eye tracking system disposed on the display panel side, for determining the viewing angle of both eyes of a viewer when viewing the display panel;

[0012] A control unit is used to adjust the voltage driving the liquid crystal deflection in the liquid crystal unit according to the viewing angle of the viewer's eyes when viewing the display panel, thereby adjusting the refractive index of the liquid crystal unit and changing the direction of the light emitted by the display panel.

[0013] In some embodiments, it also includes:

[0014] An adhesive layer is located between the liquid crystal cell and the 3D grating.

[0015] In some embodiments, the liquid crystal unit comprises:

[0016] A first substrate and a second substrate arranged opposite to each other;

[0017] A first electrode located on a side of the first substrate facing the second substrate;

[0018] a second electrode located on a side of the second substrate facing the first substrate;

[0019] a light-transmitting prism located on a side of the second electrode facing the first substrate, the light-transmitting prism defining a plurality of liquid crystal accommodating spaces;

[0020] The liquid crystal is located in the liquid crystal containing space.

[0021] In some embodiments, the light-transmitting prism is in the shape of a triangular prism.

[0022] In some embodiments, the liquid crystal unit comprises:

[0023] A first substrate and a second substrate arranged opposite to each other;

[0024] A first electrode located on a side of the first substrate facing the second substrate;

[0025] a second electrode located on a side of the second substrate facing the first substrate;

[0026] A liquid crystal is located between the second electrode and the first electrode.

[0027] An embodiment of the present invention further provides a display method for a stereoscopic display device, the display method comprising:

[0028] Acquiring the viewing angle of both eyes of the viewer when viewing the display panel through the eye tracking system;

[0029] According to the viewing angle of the viewer's eyes when viewing the display panel, the voltage driving the liquid crystal deflection in the liquid crystal unit is adjusted, thereby adjusting the refractive index of the liquid crystal unit and changing the direction of the light emitted from the display panel.

[0030] In some embodiments, obtaining the viewing angles of both eyes of the viewer when viewing the display panel through the eye tracking system includes:

[0031] Using the camera in the eye tracking system to identify the viewer's head and obtain the coordinates of the viewer's eyes;

[0032] The viewing angle of a line between a center point between the two eyes and a center point of the display panel relative to a normal line perpendicular to the display panel is determined according to the coordinates of the two eyes of the viewer.

[0033] In some embodiments, the method further comprises:

[0034] measuring the refractive index of the liquid crystal unit under different driving voltages;

[0035] A corresponding relationship between the driving voltage of the liquid crystal unit and the refractive index of the liquid crystal unit is established.

[0036] In some embodiments, the display method specifically includes:

[0037] The refractive index N3 of the liquid crystal unit is determined by the following formula, and the voltage for driving the liquid crystal deflection in the liquid crystal unit is determined according to the corresponding relationship:

[0038] θ4=arcsin(N1*sin[α-arcsin(N3*sinα / N2)] / N0)

[0039] Wherein, θ4 is the viewing angle, N1 is the refractive index of the first substrate, N2 is the refractive index of the second substrate, N0 is the refractive index of air, and α is the angle between the incident surface of the light-transmitting prism and the first substrate at which the light emitted from the display panel enters.

[0040] In some embodiments, the display method specifically includes:

[0041] The refractive index N3 of the liquid crystal unit is determined by the following formula, and the voltage for driving the liquid crystal deflection in the liquid crystal unit is determined according to the corresponding relationship:

[0042] θ4=arcsin(N3*N1*sinθ1 / N0 / N2)

[0043] Wherein, θ4 is the viewing angle, N1 is the refractive index of the first substrate, N2 is the refractive index of the second substrate, N0 is the refractive index of air, and θ1 is the angle between the light emitted from the display panel and the normal of the first substrate.

[0044] The embodiments of the present invention have the following beneficial effects:

[0045] In the above scheme, the viewing angle of the viewer's eyes when viewing the display panel can be obtained. According to the viewing angle of the viewer's eyes when viewing the display panel, the voltage driving the liquid crystal deflection in the liquid crystal unit is adjusted, and then the refractive index of the liquid crystal unit is adjusted, and the direction of the light emitted by the display panel is changed, so that the light emitted by the display panel matches the viewing angle of the viewer, so that the viewer can always see the lowest crosstalk view, thereby improving the stereoscopic clarity and the stereoscopic display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 Schematic diagram of field curvature aberration;

[0047] Figure 2 is a schematic structural diagram of a stereoscopic display device according to an embodiment of the present invention;

[0048] Figure 3-Figure 7 is a schematic structural diagram of a liquid crystal unit according to an embodiment of the present invention;

[0049] Figure 8 A schematic diagram of calculating a viewer's viewing angle according to an embodiment of the present invention;

[0050] Fig. 9 It is a flowchart of a working method of a stereoscopic display device according to an embodiment of the present invention.

[0051] Reference numerals

[0052] 01Display Panel

[0053] 02 3D Lens

[0054] 03 Adhesive layer

[0055] 04 Liquid crystal unit

[0056] 41 First substrate

[0057] 42 first electrode

[0058] 43 LCD

[0059] 44 Second electrode

[0060] 45 Second substrate

[0061] 46 Transparent Prism DETAILED DESCRIPTION

[0062] In order to make the technical problems, technical solutions and advantages to be solved by the embodiments of the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0063] In a stereoscopic display device, a 3D lens is arranged in front of the display panel, such as Figure 1 As shown in the figure, spherical 3D lenses usually have field curvature, where the red line is the direction of light propagation when looking directly at the display panel, and the blue line is the direction of light propagation when looking up at the display panel. Field curvature is an aberration caused by the defect of the lens, which makes the best clear real image surface of the light emitted on the object plane perpendicular to the main optical axis not a plane but a curved surface after being imaged by the lens. It can be seen that when looking up or down at the display panel, the corresponding pixels are out of focus, which will lead to an increase in crosstalk.

[0064] The embodiment of the present invention provides a stereoscopic display device and a working method thereof, which can ensure the stereoscopic display effect.

[0065] An embodiment of the present invention provides a stereoscopic display device, such as Figure 2 As shown, including:

[0066] Display panel 01;

[0067] A 3D grating 02 located at the light-emitting side of the display panel 01;

[0068] A liquid crystal unit 04 located at the light-emitting side of the 3D grating 02, wherein the refractive index of the liquid crystal unit 04 is adjustable;

[0069] An eye tracking system disposed on the display panel side, for determining the viewing angle of both eyes of a viewer when viewing the display panel;

[0070] A control unit is used to adjust the voltage driving the liquid crystal deflection in the liquid crystal unit according to the viewing angle of the viewer's eyes when viewing the display panel, thereby adjusting the refractive index of the liquid crystal unit and changing the direction of the light emitted by the display panel.

[0071] In this embodiment, the viewing angle of the viewer's eyes when viewing the display panel can be obtained, and according to the viewing angle of the viewer's eyes when viewing the display panel, the voltage driving the liquid crystal deflection in the liquid crystal unit is adjusted, and then the refractive index of the liquid crystal unit is adjusted, and the direction of the light emitted by the display panel is changed, so that the light emitted by the display panel matches the viewing angle of the viewer, so that the viewer can always see the lowest crosstalk view, thereby enhancing the stereoscopic clarity and improving the stereoscopic display effect.

[0072] In some embodiments, such as Figure 2 As shown, the stereoscopic display device further includes:

[0073] The adhesive layer 03 is located between the liquid crystal unit 04 and the 3D grating 02 , and the adhesive layer 03 is used to adhere the liquid crystal unit 04 and the 3D grating 02 together.

[0074] In this embodiment, the display panel 01 can be an active display device such as LED, OLED, or a passive display device such as LCD. Because the liquid crystal unit 04 can only change the propagation direction of linear polarized light, the light emitted by the display panel 01 needs to be linear polarized light. If the light emitted by the display panel 01 is non-polarized light, a polarizer needs to be attached to the light-emitting side of the display panel 01. In addition, in order to ensure the display effect of the stereoscopic display device, the refresh rate of the display panel 01 must meet 60Hz or above, for example, it can be 120Hz, 180Hz or 240Hz.

[0075] In this embodiment, the 3D grating 02 may be a lens grating, a barrier grating, a liquid crystal barrier grating, a liquid crystal lens grating, a liquid crystal resin grating, etc. The adhesive layer 03 may be an optical adhesive, and the refractive index of the material of the adhesive layer 03 may be between 1.3 and 1.7, such as 1.4 and 1.6, so as to prevent the adhesive layer 03 from affecting the propagation direction of the light emitted from the display panel 01.

[0076] In some embodiments, such as Figure 3 As shown, the liquid crystal unit 04 includes:

[0077] A first substrate 41 and a second substrate 45 arranged opposite to each other;

[0078] A first electrode 42 located on a side of the first substrate 41 facing the second substrate 45;

[0079] A second electrode 44 located on a side of the second substrate 45 facing the first substrate 41;

[0080] a light-transmitting prism 46 located on the side of the second electrode 44 facing the first substrate 41, wherein the light-transmitting prism 46 defines a plurality of liquid crystal accommodating spaces;

[0081] The liquid crystal 43 is located in the liquid crystal containing space.

[0082] In this embodiment, the first substrate 41 and the second substrate 45 may be glass substrates; the first electrode 42 and the second electrode 44 may be made of transparent conductive materials such as ITO, and the first electrode 42 and the second electrode 44 may be planar electrodes. The light-transmitting prism 46 may be made of resin, and the light-transmitting prism 46 includes an incident surface that is at a certain angle relative to the plane where the second substrate 45 is located. When the light emitted by the display panel 01 enters the liquid crystal unit 04, the light enters the light-transmitting prism 46 through the incident surface. In some embodiments, the light-transmitting prism 46 may be in the shape of a triangular prism. Of course, the light-transmitting prism 46 is not limited to a triangular prism, and may also be in other shapes.

[0083] In a specific example, Figure 3 As shown, the light-transmitting prism 46 is a right-angled triangular prism structure. The angle between the incident surface of the light-transmitting prism 46 and the plane where the second substrate 45 is located is α, and the refractive index of the light-transmitting prism 46 is N2, wherein the angle between the light of the display panel incident on the incident surface of the light-transmitting prism 46 and the normal of the incident surface is θ1, and it can be deduced that α=θ1. The long and short axis refractive indices of the liquid crystal 43 are Ne and No, respectively, and the refractive index N3 of the liquid crystal unit satisfies: Ne>N3>No; the liquid crystal 43 is driven by the electric field between the first electrode 42 and the second electrode 44, and the arrangement state changes, thereby causing the refractive index N3 of the liquid crystal 43 to change.

[0084] A voltage can be input to the first electrode 42 and the second electrode 44 in advance to measure the refractive index of the liquid crystal unit 04 under different driving voltages; the driving voltage threshold Vmax can be measured according to the structure of the transparent prism 46, and a corresponding relationship between the driving voltage Vn (with a value of 0V to VmaxV) and the refractive index N3 of the liquid crystal unit can be established.

[0085] like Figure 3 As shown, θ2 is the angle between the refracted light of the display panel after entering the light-transmitting prism 46 and the normal line of the incident surface, θ3 is the angle between the light when entering the second substrate 45 and the normal line of the second substrate 45, and θ4 is the angle between the light exiting the liquid crystal unit and the normal line of the second substrate 45. The following relationship can be obtained:

[0086] N3*sinθ1=N2*sinθ2

[0087] θ1-θ2=θ3

[0088] N1*sinθ3=N0*sinθ4

[0089] Wherein, N1 is the refractive index of the first substrate 41 , N2 is the refractive index of the second substrate 45 , and N0 is the refractive index of air.

[0090] Then we can derive formula (1):

[0091] θ4=arcsin(N1*sinθ3 / N0)=arcsin(N1*sin[α-arcsin(N3*sinα / N2)] / N0)(1)

[0092] like Figure 8 As shown, the camera in the eye tracking system can be used to identify the viewer's head to determine whether the viewer's eyes move. If the viewer's eyes do not move, the coordinates of the viewer's eyes (x1, y1, z1) are obtained. The angle θ4 of the line between the center point between the eyes and the center point of the display panel relative to the normal perpendicular to the display panel is determined according to the coordinates of the viewer's eyes. The refractive index N3 of the liquid crystal unit to be obtained is calculated according to formula (1). The driving voltage corresponding to the liquid crystal unit is determined according to the corresponding relationship between the driving voltage Vn and the refractive index N3 of the liquid crystal unit. The liquid crystal in the liquid crystal unit is driven to deflect by the driving voltage, the refractive index of the liquid crystal unit is adjusted, and the direction of the light emitted by the display panel is changed, so that the light emitted by the display panel matches the viewing angle of the viewer, so that the viewer can always see the lowest crosstalk view, thereby improving the stereoscopic clarity and the stereoscopic display effect.

[0093] In some embodiments, such as Figure 4-Figure 7 As shown, the liquid crystal unit 04 includes:

[0094] A first substrate 41 and a second substrate 45 arranged opposite to each other;

[0095] A first electrode 42 located on a side of the first substrate 41 facing the second substrate 45;

[0096] A second electrode 44 located on a side of the second substrate 45 facing the first substrate 41;

[0097] The liquid crystal 43 is located between the second electrode 44 and the first electrode 42 .

[0098] In this embodiment, the first substrate 41 and the second substrate 45 may be glass substrates; the first electrode 42 and the second electrode 44 may be made of a transparent conductive material such as ITO; Figure 4-Figure 6 As shown, the first electrode 42 and the second electrode 44 may be planar electrodes; or Figure 7 As shown, the first electrode 42 may be a strip electrode, and the second electrode 44 may be a planar electrode.

[0099] The long and short axis refractive indices of the liquid crystal 43 are Ne and No respectively, and the refractive index N3 of the liquid crystal unit 04 satisfies: Ne>N3>No; the liquid crystal 43 is driven by the electric field between the first electrode 42 and the second electrode 44, and the arrangement state changes, thereby causing the refractive index N3 of the liquid crystal 43 to also change.

[0100] Figure 4 The figure shows a schematic diagram of a liquid crystal unit in a non-powered state. Figure 5 , Figure 6 and Figure 7 Schematic diagram of the liquid crystal unit in the power-on state. Among them, θ1 is the angle between the incident light of the display panel after being deflected by the liquid crystal 43 and the normal line of the second substrate 45, θ2 is the angle between the refracted light of the display panel after being incident on the second substrate 45 and the normal line of the second substrate 45, θ3 is the angle between the light after entering the second substrate 45 and the normal line of the second substrate 45, and θ4 is the angle between the light exiting the liquid crystal unit and the normal line of the second substrate 45. The following relationship can be obtained:

[0101] N3*sinθ1=N2*sinθ2

[0102] θ2=θ3

[0103] N1*sinθ3=N0*sinθ4

[0104] cosθ1=((N3-N0)*d+d) / d

[0105] Wherein, d is the cell thickness of the liquid crystal unit, N1 is the refractive index of the first substrate 41, N2 is the refractive index of the second substrate 45, and N0 is the refractive index of air.

[0106] Then we can derive formula (2):

[0107] θ4 = arcsin(N1*sin θ3 / N0) = arcsin(N3*N1*sinθ1 / N0 / N2) (2)

[0108] Voltage may be input to the first electrode 42 and the second electrode 44 in advance to measure the refractive index of the liquid crystal unit 04 under different driving voltages; and a corresponding relationship between the driving voltage Vn (with a value of 0V to VmaxV) and the refractive index N3 of the liquid crystal unit is established.

[0109] like Figure 8 As shown, the camera in the eye tracking system can be used to identify the head of the viewer to determine whether the viewer's eyes move. If the viewer's eyes do not move, the coordinates of the viewer's eyes (x1, y1, z1) are obtained. The angle θ4 of the line between the center point between the eyes and the center point of the display panel relative to the normal perpendicular to the display panel is determined according to the coordinates of the viewer's eyes. The refractive index N3 of the liquid crystal unit to be obtained is calculated according to formula (2). The driving voltage corresponding to the liquid crystal unit is determined according to the corresponding relationship between the driving voltage Vn and the refractive index N3 of the liquid crystal unit. The liquid crystal in the liquid crystal unit is driven to deflect by the driving voltage, the refractive index of the liquid crystal unit is adjusted, and the direction of the light emitted by the display panel is changed, so that the light emitted by the display panel matches the viewing angle of the viewer, so that the viewer can always see the lowest crosstalk view, thereby improving the stereoscopic clarity and the stereoscopic display effect.

[0110] The stereoscopic display device of this embodiment includes but is not limited to: a radio frequency unit, a network module, an audio output unit, an input unit, a sensor, a display unit, a user input unit, an interface unit, a memory, a processor, and a power supply. Those skilled in the art will understand that the structure of the above-mentioned display device does not constitute a limitation on the display device, and the display device may include more or less of the above-mentioned components, or a combination of certain components, or different component arrangements. In the embodiment of the present invention, the display device includes but is not limited to a display, a mobile phone, a tablet computer, a television, a wearable electronic device, a navigation display device, etc.

[0111] The stereoscopic display device may be any product or component with a display function, such as a television, a monitor, a digital photo frame, a mobile phone, a tablet computer, etc., wherein the display device further includes a flexible circuit board, a printed circuit board and a backplane.

[0112] The embodiment of the present invention further provides a display method of a stereoscopic display device, which is applied to the stereoscopic display device as described above. Fig. 9 As shown, the display method includes:

[0113] Step 101: obtaining the viewing angle of both eyes of the viewer when viewing the display panel through the eye tracking system;

[0114] Step 102: adjusting the voltage driving the deflection of the liquid crystal 43 in the liquid crystal unit according to the viewing angle of the viewer's eyes when viewing the display panel, thereby adjusting the refractive index of the liquid crystal unit and changing the direction of the light emitted from the display panel.

[0115] In this embodiment, the viewing angle of the viewer's eyes when viewing the display panel can be obtained, and according to the viewing angle of the viewer's eyes when viewing the display panel, the voltage driving the liquid crystal deflection in the liquid crystal unit is adjusted, and then the refractive index of the liquid crystal unit is adjusted, and the direction of the light emitted by the display panel is changed, so that the light emitted by the display panel matches the viewing angle of the viewer, so that the viewer can always see the lowest crosstalk view, thereby enhancing the stereoscopic clarity and improving the stereoscopic display effect.

[0116] In some embodiments, such as Figure 8 As shown, the obtaining of the viewing angles of both eyes of the viewer when viewing the display panel by the eye tracking system includes:

[0117] The camera in the eye tracking system is used to identify the head of the viewer and obtain the coordinates of both eyes of the viewer (x1, y1, z1);

[0118] The viewing angle θ4 of the line between the center point between the two eyes and the center point of the display panel relative to the normal line perpendicular to the display panel is determined according to the coordinates of the two eyes of the viewer.

[0119] In some embodiments, the structure of the liquid crystal unit 04 is as follows: Figure 3 As shown, a voltage can be input to the first electrode 42 and the second electrode 44 in advance to measure the refractive index of the liquid crystal unit 04 under different driving voltages; the driving voltage threshold Vmax can be measured according to the structure of the transparent prism 46, and a corresponding relationship between the driving voltage Vn (ranging from 0V to VmaxV) of the liquid crystal unit and the refractive index N3 of the liquid crystal unit can be established.

[0120] like Figure 3 As shown, θ2 is the angle between the refracted light of the display panel after entering the light-transmitting prism 46 and the normal line of the incident surface, θ3 is the angle between the light when entering the second substrate 45 and the normal line of the second substrate 45, and θ4 is the angle between the light exiting the liquid crystal unit and the normal line of the second substrate 45. The following relationship can be obtained:

[0121] N3*sinθ1=N2*sinθ2

[0122] θ1-θ2=θ3

[0123] N1*sinθ3=N0*sinθ4

[0124] Wherein, N1 is the refractive index of the first substrate 41 , N2 is the refractive index of the second substrate 45 , and N0 is the refractive index of air.

[0125] Then we can derive formula (1):

[0126] θ4=arcsin(N1*sinθ3 / N0)=arcsin(N1*sin[α-arcsin(N3*sinα / N2)] / N0)(1)

[0127] like Figure 8 As shown, the camera in the eye tracking system can be used to identify the viewer's head to determine whether the viewer's eyes move. If the viewer's eyes do not move, the coordinates of the viewer's eyes (x1, y1, z1) are obtained. The angle θ4 of the line between the center point between the eyes and the center point of the display panel relative to the normal perpendicular to the display panel is determined according to the coordinates of the viewer's eyes. The refractive index N3 of the liquid crystal unit to be obtained is calculated according to formula (1). The driving voltage corresponding to the liquid crystal unit is determined according to the corresponding relationship between the driving voltage Vn and the refractive index N3 of the liquid crystal unit. The liquid crystal in the liquid crystal unit is driven to deflect by the driving voltage, the refractive index of the liquid crystal unit is adjusted, and the direction of the light emitted by the display panel is changed, so that the light emitted by the display panel matches the viewing angle of the viewer, so that the viewer can always see the lowest crosstalk view, thereby improving the stereoscopic clarity and the stereoscopic display effect.

[0128] In some embodiments, the structure of the liquid crystal unit 04 is as follows: Figure 4-Figure 7 As shown, voltage can be input to the first electrode 42 and the second electrode 44 in advance to measure the refractive index of the liquid crystal unit 04 under different driving voltages; and a corresponding relationship between the driving voltage Vn (ranging from 0V to VmaxV) of the liquid crystal unit and the refractive index N3 of the liquid crystal unit is established.

[0129] like Figure 5-Figure 7 As shown, θ1 is the angle between the incident light of the display panel after being deflected by the liquid crystal 43 and the normal line of the second substrate 45, θ2 is the angle between the refracted light of the display panel after being incident on the second substrate 45 and the normal line of the second substrate 45, θ3 is the angle between the light after entering the second substrate 45 and the normal line of the second substrate 45, and θ4 is the angle between the light exiting the liquid crystal unit and the normal line of the second substrate 45. The following relationship can be obtained:

[0130] N3*sinθ1=N2*sinθ2

[0131] θ2=θ3

[0132] N1*sinθ3=N0*sinθ4

[0133] cosθ1=((N3-N0)*d+d) / d

[0134] Wherein, d is the cell thickness of the liquid crystal unit, N1 is the refractive index of the first substrate 41, N2 is the refractive index of the second substrate 45, and N0 is the refractive index of air.

[0135] Then we can derive formula (2):

[0136] θ4 = arcsin(N1*sin θ3 / N0) = arcsin(N3*N1*sinθ1 / N0 / N2) (2)

[0137] like Figure 8 As shown, the camera in the eye tracking system can be used to identify the head of the viewer to determine whether the viewer's eyes move. If the viewer's eyes do not move, the coordinates of the viewer's eyes (x1, y1, z1) are obtained. The angle θ4 of the line between the center point between the eyes and the center point of the display panel relative to the normal perpendicular to the display panel is determined according to the coordinates of the viewer's eyes. The refractive index N3 of the liquid crystal unit to be obtained is calculated according to formula (2). The driving voltage corresponding to the liquid crystal unit is determined according to the corresponding relationship between the driving voltage Vn and the refractive index N3 of the liquid crystal unit. The liquid crystal in the liquid crystal unit is driven to deflect by the driving voltage, the refractive index of the liquid crystal unit is adjusted, and the direction of the light emitted by the display panel is changed, so that the light emitted by the display panel matches the viewing angle of the viewer, so that the viewer can always see the lowest crosstalk view, thereby improving the stereoscopic clarity and the stereoscopic display effect.

[0138] In the various method embodiments of the present invention, the serial numbers of the steps cannot be used to limit the sequence of the steps. For ordinary technicians in this field, without paying creative work, changes to the sequence of the steps are also within the protection scope of the present invention.

[0139] It should be noted that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the embodiments, since they are basically similar to the product embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the product embodiments.

[0140] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0141] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being “on” or “under” another element, it can be “directly on” or “under” the other element or intervening elements may be present.

[0142] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0143] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A stereoscopic display device, characterized in that: include: Display panel; A 3D grating located on the light-emitting side of the display panel; A liquid crystal unit located at the light-emitting side of the 3D grating, wherein the refractive index of the liquid crystal unit is adjustable; An eye tracking system disposed on the display panel side, for determining the viewing angle of both eyes of a viewer when viewing the display panel; A control unit is used to adjust the voltage driving the liquid crystal deflection in the liquid crystal unit according to the viewing angle of the viewer's eyes when viewing the display panel, thereby adjusting the refractive index of the liquid crystal unit and changing the direction of the light emitted by the display panel.

2. The stereoscopic display device according to claim 1, characterized in that: Also includes: An adhesive layer is located between the liquid crystal cell and the 3D grating.

3. The stereoscopic display device according to claim 1, characterized in that: The liquid crystal unit comprises: A first substrate and a second substrate arranged opposite to each other; A first electrode located on a side of the first substrate facing the second substrate; a second electrode located on a side of the second substrate facing the first substrate; a light-transmitting prism located on a side of the second electrode facing the first substrate, the light-transmitting prism defining a plurality of liquid crystal accommodating spaces; The liquid crystal is located in the liquid crystal containing space.

4. The stereoscopic display device according to claim 3, characterized in that: The light-transmitting prism is in the shape of a triangular prism.

5. The stereoscopic display device according to claim 1, characterized in that: The liquid crystal unit comprises: A first substrate and a second substrate arranged opposite to each other; A first electrode located on a side of the first substrate facing the second substrate; a second electrode located on a side of the second substrate facing the first substrate; A liquid crystal is located between the second electrode and the first electrode.

6. A display method of a stereoscopic display device, characterized in that: Applied to the stereoscopic display device according to any one of claims 1 to 5, the display method comprises: Acquiring the viewing angle of both eyes of the viewer when viewing the display panel through the eye tracking system; According to the viewing angle of the viewer's eyes when viewing the display panel, the voltage driving the liquid crystal deflection in the liquid crystal unit is adjusted, thereby adjusting the refractive index of the liquid crystal unit and changing the direction of the light emitted from the display panel.

7. The display method of the stereoscopic display device according to claim 6, characterized in that: The obtaining of the viewing angles of both eyes of the viewer when viewing the display panel by the eye tracking system includes: Using the camera in the eye tracking system to identify the viewer's head and obtain the coordinates of the viewer's eyes; The viewing angle of a line between a center point between the two eyes and a center point of the display panel relative to a normal line perpendicular to the display panel is determined according to the coordinates of the two eyes of the viewer.

8. The display method of the stereoscopic display device according to claim 6, characterized in that: The method further comprises: measuring the refractive index of the liquid crystal unit under different driving voltages; A corresponding relationship between the driving voltage of the liquid crystal unit and the refractive index of the liquid crystal unit is established.

9. The display method of the stereoscopic display device according to claim 8, characterized in that: Applied to the stereoscopic display device according to claim 3, the display method specifically comprises: The refractive index N3 of the liquid crystal unit is determined by the following formula, and the voltage for driving the liquid crystal deflection in the liquid crystal unit is determined according to the corresponding relationship: θ4=arcsin(N1*sin[α-arcsin(N3*sinα / N2)] / N0) Wherein, θ4 is the viewing angle, N1 is the refractive index of the first substrate, N2 is the refractive index of the second substrate, N0 is the refractive index of air, and α is the angle between the incident surface of the light-transmitting prism and the first substrate at which the light emitted from the display panel enters.

10. The display method of the stereoscopic display device according to claim 8, characterized in that: Applied to the stereoscopic display device according to claim 5, the display method specifically comprises: The refractive index N3 of the liquid crystal unit is determined by the following formula, and the voltage for driving the liquid crystal deflection in the liquid crystal unit is determined according to the corresponding relationship: θ4=arcsin(N3*N1*sinθ1 / N0 / N2) Wherein, θ4 is the viewing angle, N1 is the refractive index of the first substrate, N2 is the refractive index of the second substrate, N0 is the refractive index of air, and θ1 is the angle between the light emitted from the display panel and the normal of the first substrate.

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