Viewing angle adjusting panel, viewing angle adjusting method and display device

Abstract

The application provides a viewing angle adjusting panel, a viewing angle adjusting method and a display device, wherein the viewing angle adjusting panel is laminated on a display panel, and the viewing angle adjusting panel comprises a first substrate, a light-transmitting layer, a second substrate, a first electrode layer, a second electrode layer, a liquid crystal layer, a fourth electrode layer, a third electrode layer and a third substrate which are sequentially laminated, the first electrode layer comprises a plurality of first electrodes, the third electrode layer comprises a plurality of third electrodes, the first electrodes and the third electrodes are arranged in a staggered mode, and the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer drive the dye liquid crystal at different positions of the liquid crystal layer to deflect, so that the viewing angle adjusting panel is switched to different anti-peeping viewing angles and the anti-peeping use scenarios are expanded.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of display, and particularly relates to a viewing angle adjusting panel, a viewing angle adjusting method and a display device. BACKGROUND

[0002] With the continuous innovation and development of display technology, different display technology products are diversified, and consumer demand and industry demand are also diversified and enriched, especially the peep-proof performance of display devices.

[0003] At present, the peep-proof design mainly attaches a peep-proof film to the display panel for viewing angle adjustment, and only a single fixed viewing angle can be adjusted, the viewing angle is determined by the spacing and angle of the louver peep-proof layer, and there is great inconvenience and great limitation in the scene. SUMMARY

[0004] The purpose of the present application is to provide a viewing angle adjusting panel, which aims to solve the problem of single peep-proof viewing angle and limited use scene of the traditional peep-proof structure.

[0005] The first aspect of the embodiment of the present application proposes a viewing angle adjusting panel stacked on a display panel, the viewing angle adjusting panel comprising:

[0006] a first substrate;

[0007] a light transmission layer stacked on the first substrate, the light transmission layer comprising light shielding layers and convex lenses alternately arranged along a first direction;

[0008] a second substrate stacked on the light transmission layer;

[0009] a first electrode layer stacked on the second substrate, the first electrode layer comprising a plurality of first electrodes spaced apart along the first direction, a projection of the first electrode on the first substrate and a projection of the light shielding layer on the first substrate being coincident;

[0010] a second electrode layer stacked on the first electrode layer, the second electrode layer being a surface electrode;

[0011] a third substrate arranged opposite to the second substrate;

[0012] a third electrode layer stacked on the third substrate, a projection of the third electrode on the first substrate and a projection of the light shielding layer on the first substrate being misaligned;

[0013] a fourth electrode layer stacked on the third electrode layer, the fourth electrode layer being a surface electrode;

[0014] a liquid crystal layer located between the second electrode layer and the fourth electrode layer;

[0015] The first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer are used for receiving bias voltage of corresponding size to drive the dye liquid crystal deflection in different positions of the liquid crystal layer, so as to switch the viewing angle adjusting panel to different viewing angles.

[0016] Optionally, the viewing angle adjusting panel further comprises:

[0017] An alignment layer, comprising a first alignment layer and a second alignment layer, the first alignment layer is laminated on the second electrode layer, the second alignment layer is laminated on the fourth electrode layer, the liquid crystal layer is located between the first alignment layer and the second alignment layer, the first alignment layer and the second alignment layer are used for aligning the dye liquid crystal in a second direction, and the second direction intersects the first direction.

[0018] Optionally, the alignment angle of the first alignment layer is 90°, and the alignment angle of the second alignment layer is 270°.

[0019] Optionally, the dye liquid crystal comprises negative liquid crystal and dichroic black dye liquid crystal.

[0020] A second aspect of the embodiment of the present application provides a viewing angle adjusting method, applied to the viewing angle adjusting panel as described above, and the viewing angle adjusting method comprises:

[0021] According to the first viewing angle adjusting signal, bias voltage of corresponding size is output to each first electrode of the first electrode layer, the second electrode layer and the fourth electrode layer of the viewing angle adjusting panel, so as to drive the dye liquid crystal corresponding to the first electrode in the liquid crystal layer to deflect, so as to switch the viewing angle adjusting panel to a first privacy viewing angle.

[0022] According to the second viewing angle adjusting signal, bias voltage of corresponding size is output to each first electrode of the first electrode layer, the second electrode layer, each third electrode of the third electrode layer and the fourth electrode layer, so as to drive the dye liquid crystal corresponding to the first electrode and the third electrode in the liquid crystal layer to deflect, so as to switch the viewing angle adjusting panel to a second privacy viewing angle.

[0023] According to the third viewing angle adjusting signal, bias voltage of corresponding size is output to the 2i-1th first electrode of the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer, so as to drive the dye liquid crystal corresponding to the 2i-1th first electrode and each third electrode of the third electrode in the liquid crystal layer to deflect, so as to switch the viewing angle adjusting panel to a third privacy viewing angle, and i is a positive integer.

[0024] According to the fourth view angle adjusting signal, a corresponding size of bias voltage is output to the 2i-th first electrode of the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer, and the dye liquid crystal in the liquid crystal layer corresponding to the 2i-th first electrode and the third electrode is deflected to switch the view angle adjusting panel to a fourth privacy view angle.

[0025] Optionally, at the first privacy view angle, each first electrode of the first electrode layer inputs a first bias voltage, and the second electrode layer and the fourth electrode layer input a second bias voltage, the first bias voltage being greater than the second bias voltage.

[0026] Optionally, at the second privacy view angle, each first electrode of the first electrode layer inputs a first bias voltage, and the second electrode layer and the fourth electrode layer input a second bias voltage, and each third electrode of the third electrode layer inputs a third bias voltage, the first bias voltage being greater than the second bias voltage, and the third bias voltage being greater than the first bias voltage.

[0027] Optionally, at the third privacy view angle, the 2i-1-th first electrode of the first electrode layer inputs a first bias voltage, and the second electrode layer and the fourth electrode layer input a second bias voltage, and each third electrode of the third electrode layer inputs a third bias voltage, the first bias voltage being greater than the second bias voltage, and the third bias voltage being greater than the first bias voltage.

[0028] Optionally, at the fourth privacy view angle, the 2i-th first electrode of the first electrode layer inputs a first bias voltage, and the second electrode layer and the fourth electrode layer input a second bias voltage, and each third electrode of the third electrode layer inputs a third bias voltage, the first bias voltage being greater than the second bias voltage, and the third bias voltage being greater than the first bias voltage.

[0029] A third aspect of the embodiment of the present application provides a display device, comprising a display panel, a driving circuit and a view angle adjusting panel as described above, the view angle adjusting panel being laminated on the display panel, the driving circuit being connected with the display panel and the view angle adjusting panel respectively, and the driving circuit being used to realize the steps of the view angle adjusting method as described above.

[0030] The beneficial effects of the embodiment of the present application compared with the prior art are that the above-mentioned viewing angle adjusting panel is laminated on the display panel, the viewing angle adjusting panel comprises a first substrate, a light transmission layer, a second substrate, a first electrode layer, a second electrode layer, a liquid crystal layer, a fourth electrode layer, a third electrode layer and a third substrate which are laminated in sequence, the first electrode layer comprises a plurality of first electrodes, the third electrode layer comprises a plurality of third electrodes, the first electrodes and the third electrodes are arranged in a staggered manner, and the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer deflect the dye liquid crystal at different positions of the liquid crystal layer to switch the viewing angle adjusting panel to different anti-peep viewing angles and expand the anti-peep use scenarios by receiving bias voltages of corresponding sizes. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A structural schematic diagram of a display device provided for the embodiment one of the present application is provided.

[0032] Figure 2 A first structural schematic diagram of a viewing angle adjusting panel provided for the embodiment one of the present application is provided.

[0033] Figure 3 A structural schematic diagram of a light transmission layer provided for the embodiment one of the present application is provided.

[0034] Figure 4 A structural schematic diagram of a first electrode and a third electrode provided for the embodiment one of the present application is provided.

[0035] Figure 5 A first structural schematic diagram of a viewing angle adjusting panel provided for the embodiment one and the embodiment two of the present application is provided.

[0036] Figure 6 A second structural schematic diagram of a viewing angle adjusting panel provided for the embodiment one and the embodiment two of the present application is provided.

[0037] Figure 7 A third structural schematic diagram of a viewing angle adjusting panel provided for the embodiment one and the embodiment two of the present application is provided.

[0038] Figure 8 A flowchart of a viewing angle adjusting method provided for the embodiment two of the present application is provided.

[0039] Figure 9 A structural schematic diagram of a display device provided for the embodiment three of the present application is provided.

[0040] In the drawings, various reference signs are used for the following:

[0041] 100, view angle adjusting panel; 200, display panel; 300, driving circuit; 10, first substrate; 20, light transmission layer; 21, convex lens; 22, light shielding layer; 30, second substrate; 40, first electrode; 50, second electrode layer; 60, first alignment layer; 70, liquid crystal layer; 71, dye liquid crystal; 80, second alignment layer; 90, fourth electrode layer; 101, third electrode; 102, third substrate;

[0042] X1, first direction; X2, second direction; X3, third direction. DETAILED DESCRIPTION

[0043] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects more clearly, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0044] In addition, the terms "first", "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0045] Embodiment one

[0046] The first aspect of the embodiment of the present application proposes a view angle adjusting panel 100, as shown in the figure, the view angle adjusting panel 100 is stacked on the display panel 200, the stacked display panel 200 can be a passive light-emitting LCD (Liquid Crystal Display) liquid crystal display panel, or an active light-emitting OLED (Organic Light-Emitting Diode) display panel, etc., when it is a passive light-emitting liquid crystal display panel, the display device can be provided with a corresponding backlight module to provide a backlight. Figure 1

[0047] The display panel 200 outputs a display image, the display image is transmitted to the outside through the view angle adjusting panel 100 adjusted at a set view angle, and an observer observes the display image according to the set view angle.

[0048] As shown in the figure, in the embodiment, the view angle adjusting panel 100 includes: Figure 2 The first substrate 10;

[0049]

[0050] ​​The light-transmitting layer 20 is laminated on the first substrate 10, and includes light-blocking layers 22 and convex lenses 21 arranged alternately along a first direction X1;

[0051] The second substrate 30 is laminated on the light-transmitting layer 20;

[0052] The first electrode layer is laminated on the second substrate 30, and includes a plurality of first electrodes 40 arranged at intervals along the first direction X1, the projection of the first electrode 40 on the first substrate 10 coincides with the projection of the light-blocking layer 22 on the first substrate 10;

[0053] The second electrode layer 50 is laminated on the first electrode layer, and the second electrode layer 50 is a surface electrode;

[0054] The third substrate 102 is arranged opposite to the second substrate 30;

[0055] The third electrode layer is laminated on the third substrate 102, and includes a plurality of third electrodes 101 arranged at intervals along the first direction X1, the projection of the third electrode 101 on the first substrate 10 is arranged in a staggered manner with the projection of the light-blocking layer 22 on the first substrate 10;

[0056] The fourth electrode layer 90 is laminated on the third electrode layer, and the fourth electrode layer 90 is a surface electrode;

[0057] The liquid crystal layer 70 is located between the second electrode layer 50 and the fourth electrode layer 90;

[0058] The first electrode layer, the second electrode layer 50, the third electrode layer and the fourth electrode layer 90 are used to receive bias voltages of corresponding sizes to drive the dye liquid crystals 71 at different positions of the liquid crystal layer 70 to deflect, so as to switch the viewing angle adjusting panel 100 to different viewing angles.

[0059] In the embodiment, the display image emitted by the display panel 200 is transmitted to the light-transmitting layer 20 through the first substrate 10, as shown in Figure 3 The light-transmitting layer 20 includes light-blocking layers 22 and convex lenses 21 arranged alternately along a first direction X1, wherein the light-blocking layers 22 and the convex lenses 21 extend along a third direction X3 and are arranged in a strip shape, the first direction X1 and the third direction X3 intersect, and the first direction X1 and the third direction X3 are the extension directions of the first substrate 10, which can be the length direction and the width direction of the first substrate 10 respectively.

[0060] The light-blocking layer 22 is used to realize the isolation of the convex lens 21, and is used for the convergence of light in different light-transmitting regions, and the convex lens 21 is used to realize the condensing emission of incident light and realize the partitioned light control of the liquid crystal layer 70 at different positions.

[0061] The first electrode layer includes a plurality of first electrodes 40 arranged side by side along the first direction X1, and the third electrode layer includes a plurality of third electrodes 101 arranged side by side along the first direction X1, as shown in Figure 4 The first electrodes 40 and the third electrodes 101 extend along the third direction X3 and are arranged in a strip shape. From the perspective of the second direction X2, the projections of the first electrodes 40 on the first substrate 10 and the projections of the third electrodes 101 on the first substrate 10 are arranged in a staggered manner. The projection of the first electrode 40 on the first substrate 10 coincides with the projection of the light shielding layer 22 on the first substrate 10. The third electrode 101 can coincide with the projection of the convex lens 21 along the first direction X1 or be smaller than the size of the convex lens 21. The first electrode 40 and the third electrode 101 are used to adjust the horizontal viewing angle range.

[0062] The second electrode layer 50 is laminated on the first electrode 40. The second electrode is a surface electrode, i.e., the size of the second electrode is the same as that of the second substrate 30. The fourth electrode layer 90 is laminated on the third electrode 101. The fourth electrode layer 90 is a surface electrode, i.e., the size of the fourth electrode layer 90 is the same as that of the third substrate 102.

[0063] The first substrate 10, the second substrate 30, and the third substrate 102 are transparent substrates, which can be transparent glass substrates or transparent resin substrates, etc.

[0064] The liquid crystal layer 70 has dye liquid crystals 71. When a bias voltage is applied to the electrodes on both sides of the dye liquid crystals 71, the dye liquid crystals 71 rotate, realizing refraction, scattering, and absorption of light, and realizing changes in brightness at different angles, thereby realizing viewing angle range control.

[0065] The liquid crystal layer 70 includes a light transmission area and a non-light transmission area. The non-light transmission area corresponds to the position of the light shielding layer 22, and the non-light transmission area corresponds to the position of the convex lens 21. The light transmission area and the non-light transmission area have corresponding dye liquid crystals 71.

[0066] According to different privacy viewing angle requirements, different combinations of bias voltages can be output to the first electrode 40 of the first electrode layer, the second electrode layer 50, the third electrode 101 of the third electrode layer, and the fourth electrode layer 90. The corresponding dye liquid crystals 71 of the light transmission area and the non-light transmission area of the liquid crystal layer 70 correspond to deflection. The viewing angle adjustment panel 100 is adjusted to different viewing angles.

[0067] For example, in an optional embodiment, the first electrode 40 of the first electrode layer and the third electrode 101 of the third electrode layer do not apply a bias voltage, and the second electrode layer 50 and the fourth electrode layer 90 respectively apply bias voltages of different sizes. The corresponding dye liquid crystals 71 of the liquid crystal layer 70 all have an electric field, realizing liquid crystal deflection. The display image of the display panel 200 can be transmitted through the dye liquid crystals 71 of the light transmission area and the non-light transmission area, and finally transmitted to the outside through the third substrate 102. Observers can observe the display image at the normal viewing angle, left and right viewing angles.

[0068] Alternatively, in another optional embodiment, a first bias voltage is applied to the second electrode layer 50 and the fourth electrode layer 90, a second bias voltage is applied to the first electrode 40 of the first electrode layer, and no bias voltage is applied to the third electrode 101 of the third electrode layer, such as... Figure 5 As shown, at this time, the first electrode 40 of the first electrode layer corresponds to the non-transparent area, and there is an electric field between the first electrode 40 of the first electrode layer and the fourth electrode layer 90. The third electrode 101 of the third electrode layer corresponds to the non-transparent area. There is no electric field in the dye liquid crystal 71 in the non-transparent area. At this time, the dye liquid crystal 71 in the non-transparent area deflects, while the dye liquid crystal 71 in the transparent area does not deflect. No light passes through in the vertical direction, that is, a black screen is displayed at the normal viewing angle. When the dye liquid crystal 71 in the non-transparent area deflects, light can be transmitted to the outside through the dye liquid crystal 71 in the non-transparent area. The display screen can be observed from the left and right viewing angles. At the same time, by changing the first bias voltage and the second bias voltage to form electric fields of different magnitudes, the privacy angle of the left and right viewing angles can be adjusted to achieve control of the left and right viewing angles.

[0069] Alternatively, in another optional embodiment, a first bias voltage is applied to the second electrode layer 50 and the fourth electrode layer 90, a second bias voltage is applied to the first electrode 40 of the first electrode layer, and a third bias voltage is applied to the third electrode 101 of the third electrode layer. The third bias voltage is greater than the second bias voltage, and the second bias voltage is greater than the first bias voltage. In this case, as... Figure 6 As shown, the first electrode 40 of the first electrode layer corresponds to the non-transparent area. There is an electric field between the first electrode 40 of the first electrode layer and the fourth electrode layer 90. The third electrode 101 of the third electrode layer corresponds to the non-transparent area. There is an electric field between the third electrode 101 of the third electrode layer and the second electrode layer 50. The dye liquid crystal 71 in the non-transparent and transparent areas deflects, and light passes through in the vertical direction. The normal picture is displayed from the front viewing angle. The light can be transmitted to the outside through the dye liquid crystal 71 in the non-transparent area. The display picture can also be observed from the left and right viewing angles. At the same time, by changing the magnitude of the first bias voltage, the second bias voltage and the third bias voltage, different electric fields can be formed, and the privacy angle of the left and right viewing angles can be adjusted to achieve left and right viewing angle control.

[0070] Alternatively, in another optional embodiment, a first bias voltage is applied to the second electrode layer 50 and the fourth electrode layer 90, and a second bias voltage is applied to an odd number of the first electrodes 40 in the first electrode layer, such as the first first electrode 40, the third first electrode 40, the fifth first electrode 40, etc. A third bias voltage is applied to the third electrode 101 of the third electrode layer, and the third bias voltage is greater than the second bias voltage, and the second bias voltage is greater than the first bias voltage. In this case, such as Figure 7As shown, the odd-numbered first electrodes 40 are located on the left side of the convex lens 21, the even-numbered first electrodes 40 are located on the right side of the convex lens 21, the odd-numbered first electrodes 40 correspond to the non-light-transmitting area on the left side of the convex lens 21, and an electric field exists between the odd-numbered first electrodes 40 and the fourth electrode layer 90. The third electrode 101 of the third electrode layer corresponds to the non-light-transmitting area, and an electric field exists between the third electrode 101 of the third electrode layer and the second electrode layer 50. The dye liquid crystal 71 in the non-light-transmitting area and the light-transmitting area on the left side of the convex lens 21 deflects, and light passes in the vertical direction. A normal picture is displayed at a positive viewing angle, and at the same time, light can be transmitted through the dye liquid crystal 71 in the non-light-transmitting area on the left side of the convex lens 21 to the outside. The display picture can also be observed at the left viewing angle, and the display picture cannot be observed at the right viewing angle. At the same time, by changing the sizes of the first bias voltage, the second bias voltage, and the third bias voltage to form electric fields of different sizes, the size of the anti-peep angle of the left viewing angle can be adjusted to achieve left viewing angle control.

[0071] Alternatively, in another optional embodiment, the second electrode layer 50 and the fourth electrode layer 90 apply a first bias voltage, the even-numbered first electrodes 40 in the first electrode layer apply a second bias voltage, for example, the second first electrode 40, the fourth first electrode 40, the sixth first electrode 40, etc. The third electrode 101 of the third electrode layer applies a third bias voltage, the third bias voltage is greater than the second bias voltage, and the second bias voltage is greater than the first bias voltage. At this time, the odd-numbered first electrodes 40 are located on the left side of the convex lens 21, the even-numbered first electrodes 40 are located on the right side of the convex lens 21, the even-numbered first electrodes 40 correspond to the non-light-transmitting area on the right side of the convex lens 21, and an electric field exists between the even-numbered first electrodes 40 and the fourth electrode layer 90. The third electrode 101 of the third electrode layer corresponds to the non-light-transmitting area, and an electric field exists between the third electrode 101 of the third electrode layer and the second electrode layer 50. The dye liquid crystal 71 in the non-light-transmitting area and the light-transmitting area on the right side of the convex lens 21 deflects, and light passes in the vertical direction. A normal picture is displayed at a positive viewing angle, and at the same time, light can be transmitted through the dye liquid crystal 71 in the non-light-transmitting area on the right side of the convex lens 21 to the outside. The display picture can also be observed at the right viewing angle, and the display picture cannot be observed at the left viewing angle. At the same time, by changing the sizes of the first bias voltage, the second bias voltage, and the third bias voltage to form electric fields of different sizes, the size of the anti-peep angle of the right viewing angle can be adjusted to achieve right viewing angle control.

[0072] Further, when no electric field is applied to the electrodes of the viewing angle adjusting panel 100, the directions of the dye liquid crystals 71 can be in a disordered state, which causes the deflection directions of the dye liquid crystals 71 corresponding to the light-transmitting area and the non-light-transmitting area to be different when an electric field is applied, resulting in abnormal light emission. In order to solve this problem, in an optional embodiment, as shown in Figure 1 The viewing angle adjusting panel 100 further comprises:

[0073] The alignment layer includes a first alignment layer 60 and a second alignment layer 80, the first alignment layer 60 is laminated on the second electrode layer 50, the second alignment layer 80 is laminated on the fourth electrode layer 90, and the liquid crystal layer 70 is located between the first alignment layer 60 and the second alignment layer 80. The first alignment layer 60 and the second alignment layer 80 are used for the alignment of the dye liquid crystal 71 in the second direction X2, and the second direction X2 is perpendicular to the first direction X1.

[0074] In this embodiment, after the first alignment layer 60 and the second alignment layer 80 are subjected to photo-alignment, an anchoring force in the second direction X2 is applied, as shown in the figure, so that the long axis of the dye liquid crystal 71 is aligned in the second direction X2, so that the dye liquid crystal 71 is in the same direction when no electric field is applied to the electrodes, and the dye liquid crystal 71 in different regions corresponds to an ordered deflection when an electric field is applied, so that the dye liquid crystal 71 of the liquid crystal layer 70 is in an ordered state, ensuring that the light in the corresponding region is emitted to the outside according to the corresponding viewing angle, realizing the viewing angle control. Figure 2

[0075] In this embodiment, after the first alignment layer 60 and the second alignment layer 80 are subjected to photo-alignment, an anchoring force in the second direction X2 is applied, as shown in the figure, so that the long axis of the dye liquid crystal 71 is aligned in the second direction X2, so that the dye liquid crystal 71 is in the same direction when no electric field is applied to the electrodes, and the dye liquid crystal 71 in different regions corresponds to an ordered deflection when an electric field is applied, so that the dye liquid crystal 71 of the liquid crystal layer 70 is in an ordered state, ensuring that the light in the corresponding region is emitted to the outside according to the corresponding viewing angle, realizing the viewing angle control.

[0076] In this embodiment, after the first alignment layer 60 and the second alignment layer 80 are subjected to photo-alignment, an anchoring force in the second direction X2 is applied, as shown in the figure, so that the long axis of the dye liquid crystal 71 is aligned in the second direction X2, so that the dye liquid crystal 71 is in the same direction when no electric field is applied to the electrodes, and the dye liquid crystal 71 in different regions corresponds to an ordered deflection when an electric field is applied, so that the dye liquid crystal 71 of the liquid crystal layer 70 is in an ordered state, ensuring that the light in the corresponding region is emitted to the outside according to the corresponding viewing angle, realizing the viewing angle control.

[0077] The dye liquid crystal 71 can be selected according to the requirements, such as positive liquid crystal, negative liquid crystal, etc. In an optional embodiment, the dye liquid crystal 71 includes negative liquid crystal and biaxial black dye liquid crystal 71, and when the electrode layers on the upper and lower sides of the dye liquid crystal 71 apply an electric field, the negative liquid crystal rotates to drive the biaxial black dye liquid crystal 71 to deflect, realizing the refraction, scattering and absorption of light, realizing the change of brightness at different angles, and then realizing the viewing angle range control.

[0078] ​In the preparation of the viewing angle adjustment panel 100, a plurality of light shielding layers 22 can be stacked on the first substrate 10 with a spacing, then the convex lenses 21 are arranged between the light shielding layers 22, then the second substrate 30 is formed on the light transmission layer 20, and the first electrode layer, the second electrode layer 50 and the first alignment layer 60 are sequentially stacked on the second substrate 30, the third electrode layer, the fourth electrode layer 90 and the second alignment layer 80 are sequentially stacked on the third substrate 102, the liquid crystal layer 70 is formed between the second substrate 30 and the third substrate 102, and the dye liquid crystal 71 is sealed by structural bonding such as frame glue.

[0079] In order to avoid short circuit of the stacked electrode layers when the bias voltage is applied, form a direct circuit, etc., in an optional embodiment, an insulating layer is further stacked between the first electrode layer and the second electrode layer 50, and an insulating layer is further stacked between the third electrode layer and the fourth electrode layer 90, the insulating layer is used to realize electrical insulation, avoid short circuit, direct current path, etc., and improve the driving safety.

[0080] The beneficial effects of the embodiment of the present application compared with the prior art are that the above-mentioned viewing angle adjustment panel 100 is stacked on the display panel 200, the viewing angle adjustment panel 100 includes the first substrate 10, the light transmission layer 20, the second substrate 30, the first electrode layer, the second electrode layer 50, the liquid crystal layer 70, the fourth electrode layer 90, the third electrode layer and the third substrate 102 which are sequentially stacked, the first electrode layer includes a plurality of first electrodes 40, the third electrode layer includes a plurality of third electrodes 101, the first electrodes 40 and the third electrodes 101 are arranged in a staggered manner, and the first electrodes 40 of the first electrode layer, the second electrode layer 50, the third electrodes 101 of the third electrode layer, and the fourth electrode layer 90 are arranged to receive bias voltages of corresponding sizes to drive the dye liquid crystals 71 at different positions of the liquid crystal layer 70 to deflect, so as to switch the viewing angle adjustment panel 100 to different anti-peep viewing angles and expand the anti-peep use scenarios.

[0081] Embodiment two

[0082] Based on the above-mentioned viewing angle adjustment panel 100, the second aspect of the embodiment of the present application proposes a viewing angle adjustment method applied to the above-mentioned viewing angle adjustment panel 100, and the viewing angle adjustment method includes:

[0083] S10, according to the first viewing angle adjustment signal, outputting a bias voltage of a corresponding size to each first electrode 40 of the first electrode layer, the second electrode layer 50 and the fourth electrode layer 90 of the viewing angle adjustment panel 100, driving the dye liquid crystal 71 corresponding to the first electrode 40 in the liquid crystal layer 70 to deflect, so as to switch the viewing angle adjustment panel 100 to the first anti-peep viewing angle.

[0084] In this embodiment, the viewing angle adjustment panel 100 can work in a security leak scene, that is, the display picture cannot be observed at the normal viewing angle, and the display picture can be observed at the side viewing angle.

[0085] In this scenario, the first electrode 40 of the first electrode layer, the second electrode layer 50 and the fourth electrode layer 90 respectively apply a bias voltage, and the third electrode 101 of the third electrode layer does not apply a bias voltage, as shown. At this time, the first electrode 40 of the first electrode layer corresponds to the non-light transmission area, and an electric field is formed between the first electrode 40 of the first electrode layer and the fourth electrode layer 90. The third electrode 101 of the third electrode layer corresponds to the non-light transmission area, and no electric field exists in the dye liquid crystal 71 of the non-light transmission area. At this time, the dye liquid crystal 71 of the non-light transmission area is deflected, the dye liquid crystal 71 of the light transmission area is not deflected, and no light passes in the vertical direction, that is, a black picture is displayed at a normal viewing angle. The dye liquid crystal 71 of the non-light transmission area is deflected, and light can be transmitted through the dye liquid crystal 71 of the non-light transmission area to the outside, and the display picture can be observed at left and right viewing angles. Figure 5

[0086] In order to realize that no electric field exists in the light transmission area and an electric field exists in the non-light transmission area, in an optional embodiment, under the first anti-peep viewing angle, each first electrode 40 of the first electrode layer inputs a first bias voltage, the second electrode layer 50 and the fourth electrode layer 90 input a second bias voltage, and the first bias voltage is greater than the second bias voltage. At this time, an electric field exists between the first electrode 40 of the first electrode layer and the fourth electrode layer 90, the dye liquid crystal 71 of the non-light transmission area is deflected, the dye liquid crystal 71 of the light transmission area is not deflected, no light passes in the vertical direction, the dye liquid crystal 71 of the non-light transmission area is deflected, light can be transmitted through the dye liquid crystal 71 of the non-light transmission area to the outside, and the display picture can be observed at left and right viewing angles. At the same time, by changing the first bias voltage and the second bias voltage, the size of the anti-peep angle of the left and right viewing angles can be adjusted when different size electric fields are formed, and the left and right viewing angles are controlled.

[0087] S20, according to the second viewing angle adjusting signal, outputting a bias voltage of a corresponding size to each first electrode 40 of the first electrode layer, the second electrode layer 50, each third electrode 101 of the third electrode layer and the fourth electrode layer 90, driving the dye liquid crystal 71 corresponding to the first electrode 40 and the third electrode 101 in the liquid crystal layer 70 to deflect, so as to switch the viewing angle adjusting panel 100 to the second anti-peep viewing angle.

[0088] In this embodiment, the viewing angle adjusting panel 100 can work in the first anti-peep scenario, that is, the left and right anti-peep viewing angle ranges can be adjusted at the same time, and the left and right observers are prevented from peeping.

[0089] ​In this scenario, the first electrode 40 of the first electrode layer, the second electrode layer 50, the third electrode 101 of the third electrode layer and the fourth electrode layer 90 respectively apply a bias voltage, wherein the bias voltage applied by the second electrode layer 50 and the fourth electrode layer 90 is equal, the bias voltage applied by the first electrode 40 of the first electrode layer is different from the bias voltage on the fourth electrode layer 90, an electric field is formed between the first electrode 40 of the first electrode layer and the fourth electrode layer 90, at the same time, the bias voltage applied by the third electrode 101 of the third electrode layer is different from the bias voltage on the second electrode layer 50, an electric field is formed between the second electrode layer 50 and the third electrode 101 of the third electrode layer, as shown in Figure 6 , the dye liquid crystal 71 in the non-light transmission area and the light transmission area deflects, light passes in the vertical direction, a normal viewing angle displays a normal picture, light can be transmitted through the dye liquid crystal 71 in the non-light transmission area to the outside, and the display picture can be observed at the left and right viewing angles. At the same time, by changing the size of the bias voltage of the first electrode 40 of the first electrode layer, the second electrode layer 50, the third electrode 101 of the third electrode layer and the fourth electrode layer 90, the size of the privacy angle of the left and right viewing angles can be adjusted when different size electric fields are formed, and the left and right viewing angles are controlled.

[0090] In order to realize the deflection of the liquid crystal in the light transmission area and the non-light transmission area, in an optional embodiment, under the second privacy viewing angle, the first electrode 40 of the first electrode layer inputs a first bias voltage, the second electrode layer 50 and the fourth electrode layer 90 input a second bias voltage, and the third electrode 101 of the third electrode layer inputs a third bias voltage, the first bias voltage is greater than the second bias voltage, and the third bias voltage is greater than the first bias voltage. At this time, as shown in Figure 6 , there is an electric field between the first electrode 40 of the first electrode layer and the fourth electrode layer 90, the third electrode 101 of the third electrode layer corresponds to the non-light transmission area, there is an electric field between the third electrode 101 of the third electrode layer and the second electrode layer 50, the dye liquid crystal 71 in the non-light transmission area and the light transmission area deflects, light passes in the vertical direction, a normal viewing angle displays a normal picture, light can be transmitted through the dye liquid crystal 71 in the non-light transmission area to the outside, and the display picture can be observed at the left and right viewing angles.

[0091] S30, according to the third viewing angle adjusting signal, outputting a bias voltage of a corresponding size to the 2i-1th first electrode 40 of the first electrode layer, the second electrode layer 50, each third electrode 101 of the third electrode layer and the fourth electrode layer 90, driving the dye liquid crystal 71 corresponding to the 2i-1th first electrode 40 and the third electrode 101 in the liquid crystal layer 70 to deflect, so as to switch the viewing angle adjusting panel 100 to the third privacy viewing angle, i is a positive integer.

[0092] In the embodiment, the viewing angle adjusting panel 100 can work in the second privacy scene, that is, the unilateral privacy viewing angle can be adjusted independently, so that the left observer can observe the display image and the right observer cannot observe the display image.

[0093] In this scenario, the first electrode 40, the second electrode layer 50, the third electrode 101 of the third electrode layer, and the fourth electrode layer 90 of the 2i-1th are respectively applied with a bias voltage, the first electrode 40 of the 2i-1th is located on the left side of the convex lens 21, the first electrode 40 of the 2i-1th is located on the right side of the convex lens 21, the first electrode 40 of the 2i-1th corresponds to the non-light-transmitting area on the left side of the convex lens 21, and there is an electric field between the first electrode 40 of the 2i-1th and the fourth electrode layer 90, the third electrode 101 of the third electrode layer corresponds to the non-light-transmitting area, and there is an electric field between the third electrode 101 of the third electrode layer and the second electrode layer 50, the dye liquid crystal 71 of the non-light-transmitting area and the light-transmitting area on the left side of the convex lens 21 deflects, as shown, there is light in the vertical direction, the normal viewing angle displays a normal image, at the same time, the light can be transmitted to the outside through the dye liquid crystal 71 of the non-light-transmitting area on the left side of the convex lens 21, the left viewing angle can also observe the display image, and the right viewing angle cannot observe the display image, at the same time, by changing the size of the first bias voltage, the second bias voltage and the third bias voltage, the size of the electric field formed can be adjusted to adjust the size of the privacy angle of the left viewing angle, and the left viewing angle control is realized. Figure 7

[0094] Among them, in order to realize the deflection of the liquid crystal of the light-transmitting area and the left non-light-transmitting area, in an optional embodiment, under the third privacy viewing angle, the first electrode 40 of the 2i-1th of the first electrode layer inputs the first bias voltage, the second electrode layer 50 and the fourth electrode layer 90 input the second bias voltage, and each third electrode 101 of the third electrode layer inputs the third bias voltage, the first bias voltage is greater than the second bias voltage, and the third bias voltage is greater than the first bias voltage.

[0095] The first electrode 40 of the 2i-1th can be the first first electrode 40, the third first electrode 40, the fifth first electrode 40, etc. Figure 7 ​As shown, the odd-numbered first electrodes 40 are located on the left side of the convex lens 21, the even-numbered first electrodes 40 are located on the right side of the convex lens 21, the odd-numbered first electrodes 40 correspond to the non-light-transmitting area on the left side of the convex lens 21, there is an electric field between the odd-numbered first electrodes 40 and the fourth electrode layer 90, the third electrodes 101 of the third electrode layer correspond to the non-light-transmitting area, there is an electric field between the third electrodes 101 of the third electrode layer and the second electrode layer 50, the dye liquid crystals 71 of the non-light-transmitting area and the light-transmitting area on the left side of the convex lens 21 are deflected, there is light passing in the vertical direction, a normal viewing angle displays a normal picture, at the same time, light can be transmitted through the dye liquid crystals 71 of the non-light-transmitting area on the left side of the convex lens 21 to the outside, the display picture can also be observed at the left viewing angle, the display picture cannot be observed at the right viewing angle, at the same time, by changing the sizes of the first bias voltage, the second bias voltage and the third bias voltage, the size of the anti-peep angle of the left viewing angle can be adjusted when different sizes of electric fields are formed, and the left viewing angle control is realized.

[0096] S40, according to the fourth viewing angle adjusting signal, outputting a bias voltage of a corresponding size to the 2i-th first electrode 40 of the first electrode layer, the second electrode layer 50, the third electrode 101 of the third electrode layer and the fourth electrode layer 90, driving the dye liquid crystals 71 corresponding to the 2i-th first electrode 40 and each third electrode 101 in the liquid crystal layer 70 to deflect, so as to switch the viewing angle adjusting panel 100 to the fourth anti-peep viewing angle.

[0097] In this embodiment, the viewing angle adjusting panel 100 can work in the second anti-peep scene, that is, the one-sided anti-peep viewing angle can be adjusted alone, and the left observer can observe the display picture / the right observer cannot observe the display picture.

[0098] In this scene, the 2i-th first electrode 40, the second electrode layer 50, the third electrode 101 of the third electrode layer and the fourth electrode layer 90 respectively apply a bias voltage, the 2i-1-th first electrode 40 is located on the left side of the convex lens 21, the 2i-th first electrode 40 is located on the right side of the convex lens 21, the 2i-th first electrode 40 corresponds to the non-light-transmitting area on the right side of the convex lens 21, there is an electric field between the 2i-th first electrode 40 and the fourth electrode layer 90, the third electrodes 101 of the third electrode layer correspond to the non-light-transmitting area, there is an electric field between the third electrodes 101 of the third electrode layer and the second electrode layer 50, the dye liquid crystals 71 of the non-light-transmitting area and the light-transmitting area on the right side of the convex lens 21 are deflected, there is light passing in the vertical direction, a normal viewing angle displays a normal picture, at the same time, light can be transmitted through the dye liquid crystals 71 of the non-light-transmitting area on the right side of the convex lens 21 to the outside, the display picture can also be observed at the right viewing angle, the display picture cannot be observed at the left viewing angle, at the same time, by changing the sizes of the first bias voltage, the second bias voltage and the third bias voltage, the size of the anti-peep angle of the right viewing angle can be adjusted when different sizes of electric fields are formed, and the right viewing angle control is realized.

[0099] In order to realize the liquid crystal deflection of the light-transmitting area and the left non-light-transmitting area, in an optional embodiment, under the fourth anti-peep angle, the first electrode 40 of the 2i-th first electrode layer inputs a first bias voltage, the second electrode layer 50 and the fourth electrode layer 90 input a second bias voltage, the third electrode 101 of the third electrode layer inputs a third bias voltage, the first bias voltage is greater than the second bias voltage, and the third bias voltage is greater than the first bias voltage.

[0100] The 2i-th first electrode 40 can be the second first electrode 40, the fourth first electrode 40, the sixth first electrode 40, etc. The odd-numbered first electrodes 40 are located on the left side of the convex lens 21, the even-numbered first electrodes 40 are located on the right side of the convex lens 21, the even-numbered first electrodes 40 correspond to the non-light-transmitting area on the left side of the convex lens 21, and there is an electric field between the even-numbered first electrodes 40 and the fourth electrode layer 90. The third electrode 101 of the third electrode layer corresponds to the non-light-transmitting area, and there is an electric field between the third electrode 101 of the third electrode layer and the second electrode layer 50. The dye liquid crystal 71 of the non-light-transmitting area and the light-transmitting area on the right side of the convex lens 21 deflects, and light passes in the vertical direction. The normal angle displays a normal picture, at the same time, the light can be transmitted to the outside through the dye liquid crystal 71 of the non-light-transmitting area on the right side of the convex lens 21, and the right angle can also observe the display picture, and the left angle cannot observe the display picture.

[0101] It should be understood that the size of the serial number of each step in the above-mentioned embodiments does not mean the order of execution, and the execution order of each process should be determined according to its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0102] Embodiment three

[0103] The present application also provides a display device, which comprises a display panel 200, a driving circuit 300 and an angle adjusting panel 100. The specific structure of the angle adjusting panel 100 is referred to the above-mentioned embodiments. Since the display device adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Among them, the angle adjusting panel 100 is stacked on the display panel 200, the driving circuit 300 is connected with the display panel 200 and the angle adjusting panel 100 respectively, and the driving circuit 300 is used to realize the steps of the above-mentioned angle adjusting method.

[0104] In this embodiment, the driving circuit 300 can include a controller, a driving unit of the display panel, and a bias voltage output circuit. The driving unit of the display panel can include corresponding source driving modules and gate driving modules. The gate driving modules are connected with the scan lines of the display panel 200 and output row scanning signals to drive the display panel 200 row by row. The source driving modules are connected with the data lines of the display panel 200 and output data signals to the display panel 200 during row scanning, so as to drive the pixel units of the display panel 200 to display corresponding image information. The displayed image is transmitted to the viewing angle adjusting panel 100.

[0105] The controller is configured to receive corresponding video data and a viewing angle adjusting signal, output a corresponding control signal to control the source driving modules and the gate driving modules to work according to the video data, and output a corresponding combined bias voltage to the first electrode 40 of the first electrode layer, the second electrode layer 50, the third electrode 101 of the third electrode layer, and the fourth electrode layer 90 of the viewing angle adjusting panel 100 based on the viewing angle adjusting signal and the above viewing angle adjusting method. The first electrode 40 of the first electrode layer, the second electrode layer 50, the third electrode 101 of the third electrode layer, and the fourth electrode layer 90 receive bias voltages of corresponding sizes to drive the dye liquid crystals 71 at different positions of the liquid crystal layer 70 to deflect, so as to switch the viewing angle adjusting panel 100 to different privacy viewing angles and expand the privacy use scenarios.

[0106] The gate driving modules can be connected with a plurality of shift registers in sequence. Each shift register is connected with a scan line and outputs a row scanning signal row by row. The source driving modules can be composed of a plurality of chip on film (COF) modules. The COF modules are bonded on the display panel 200. Each COF module is provided with a plurality of transmission channels and a driving chip. The driving chip is connected with a plurality of data lines through the plurality of transmission channels and outputs a plurality of data signals to the display panel 200.

[0107] The bias voltage output circuit can be a switching power supply circuit, a buck-boost circuit, or the like. The bias voltage output circuit can be provided with a plurality of paths, each of which is connected with a corresponding electrode layer. In an optional embodiment, the bias voltage output circuit includes a first voltage output unit, a second voltage output unit, a third voltage output unit, and a fourth voltage output unit. The first voltage output unit is connected with the first electrode 40 of the 2i-1th first electrode layer. The second voltage output unit is connected with the first electrode 40 of the 2i th first electrode layer. The third voltage output unit is connected with each third electrode 101 of the third electrode layer. The fourth voltage output unit is connected with the second electrode layer 50 and the fourth electrode layer 90 simultaneously. The first voltage output unit, the second voltage output unit, the third voltage output unit, and the fourth voltage output unit are respectively connected with the controller and output bias voltages of corresponding sizes to corresponding electrodes according to the voltage adjusting signals output by the controller.

[0108] The voltage output unit can adopt a voltage stabilizing circuit, a switching power supply circuit, etc., and the specific structure is not limited.

[0109] The display panel 200 can be a passive light-emitting LCD (Liquid Crystal Display) or an active light-emitting OLED (Organic Light-Emitting Diode) display panel, etc. When it is a passive light-emitting LCD, the display device can further include a corresponding backlight module to provide a backlight.

[0110] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A viewing angle adjustment panel laminated on a display panel, characterized by, The view angle adjusting panel comprises: a first substrate; a light-transmitting layer laminated on the first substrate, the light-transmitting layer comprising light-shielding layers and convex lenses arranged alternately along a first direction; a second substrate laminated on the light-transmitting layer; a first electrode layer laminated on the second substrate, the first electrode layer comprising a plurality of first electrodes arranged at intervals along the first direction, projections of the first electrodes on the first substrate and projections of the light-shielding layers on the first substrate being coincident; a second electrode layer laminated on the first electrode layer, the second electrode layer being a surface electrode; a third substrate arranged opposite to the second substrate; a third electrode layer laminated on the third substrate, the third electrode layer comprising a plurality of third electrodes arranged at intervals along the first direction, projections of the third electrodes on the first substrate and projections of the light-shielding layers on the first substrate being misaligned; a fourth electrode layer laminated on the third electrode layer, the fourth electrode layer being a surface electrode; a liquid crystal layer between the second electrode layer and the fourth electrode layer; the first electrode layer, the second electrode layer, the third electrode layer and the fourth electrode layer are used to receive bias voltages of corresponding sizes to drive dye liquid crystals at different positions of the liquid crystal layer to deflect, so as to switch the view angle adjusting panel to different view angles.

2. The view angle adjustment panel of claim 1, wherein, The view angle adjusting panel further comprises: alignment layers comprising a first alignment layer and a second alignment layer, the first alignment layer being laminated on the second electrode layer, the second alignment layer being laminated on the fourth electrode layer, the liquid crystal layer being between the first alignment layer and the second alignment layer, the first alignment layer and the second alignment layer being used to perform alignment of the dye liquid crystals in a second direction, the second direction intersecting the first direction.

3. The view angle adjustment panel of claim 2, wherein, An alignment angle of the first alignment layer is 90°, and an alignment angle of the second alignment layer is 270°.

4. The viewing angle adjustment panel of claim 1, wherein, The dye liquid crystals comprise negative liquid crystals and dichroic black dye liquid crystals.

5. A viewing angle adjustment method applied to the viewing angle adjustment panel according to any one of claims 1 to 4, characterized by, The view angle adjusting method comprises: outputting bias voltages of corresponding sizes to each first electrode of a first electrode layer, a second electrode layer and a fourth electrode layer of the view angle adjusting panel according to a first view angle adjusting signal, driving dye liquid crystals corresponding to the first electrodes in the liquid crystal layer to deflect, so as to switch the view angle adjusting panel to a first privacy view angle; outputting bias voltages of corresponding sizes to each first electrode of the first electrode layer, each third electrode of a third electrode layer and the fourth electrode layer according to a second view angle adjusting signal, driving dye liquid crystals corresponding to the first electrodes and the third electrodes in the liquid crystal layer to deflect, so as to switch the view angle adjusting panel to a second privacy view angle; outputting bias voltages of corresponding sizes to a 2i-1th first electrode of the first electrode layer, each third electrode of the third electrode layer and the fourth electrode layer according to a third view angle adjusting signal, driving dye liquid crystals corresponding to the 2i-1th first electrode and the third electrodes in the liquid crystal layer to deflect, so as to switch the view angle adjusting panel to a third privacy view angle, i being a positive integer. According to the fourth view angle adjusting signal, a corresponding size of bias voltage is output to the 2i-th first electrode of the first electrode layer, the second electrode layer, each third electrode of the third electrode layer and the fourth electrode layer, the dye liquid crystal in the liquid crystal layer corresponding to the 2i-th first electrode and the third electrode is deflected to switch the view angle adjusting panel to a fourth privacy view angle.

6. The viewing angle adjusting method according to claim 5, wherein In the first privacy view angle, each first electrode of the first electrode layer inputs a first bias voltage, the second electrode layer and the fourth electrode layer input a second bias voltage, and the first bias voltage is greater than the second bias voltage.

7. The viewing angle adjusting method according to claim 5, wherein In the second privacy view angle, each first electrode of the first electrode layer inputs a first bias voltage, the second electrode layer and the fourth electrode layer input a second bias voltage, each third electrode of the third electrode layer inputs a third bias voltage, and the first bias voltage is greater than the second bias voltage, and the third bias voltage is greater than the first bias voltage.

8. The viewing angle adjusting method according to claim 5, wherein In the third privacy view angle, the 2i-1-th first electrode of the first electrode layer inputs a first bias voltage, the second electrode layer and the fourth electrode layer input a second bias voltage, each third electrode of the third electrode layer inputs a third bias voltage, and the first bias voltage is greater than the second bias voltage, and the third bias voltage is greater than the first bias voltage.

9. The viewing angle adjusting method according to claim 5, wherein In the fourth privacy view angle, the 2i-th first electrode of the first electrode layer inputs a first bias voltage, the second electrode layer and the fourth electrode layer input a second bias voltage, each third electrode of the third electrode layer inputs a third bias voltage, and the first bias voltage is greater than the second bias voltage, and the third bias voltage is greater than the first bias voltage.

10. A display device, characterized by comprising: The display panel, the driving circuit and the view angle adjusting panel according to any one of claims 1-4 are included, the view angle adjusting panel is laminated on the display panel, the driving circuit is connected with the display panel and the view angle adjusting panel respectively, and the driving circuit is used for realizing the steps of the view angle adjusting method according to any one of claims 5-9.

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