Display device and operating method thereof

Abstract

The invention discloses a display device and an operation method thereof. The display device comprises a display panel, a light regulation and control module, a first light source, a second light source and a third light source. The light regulation and control module is arranged below the display panel and comprises a first light guide body, a second light guide body and a diffusion structure body. The first light guide body comprises first microstructures, and the first microstructures extend in the first direction and are arranged in the second direction. The second light guide body is arranged on the first light guide body, the second light guide body comprises second microstructures, and the second microstructures extend in the second direction and are arranged in the first direction. The diffusion structure body is arranged on the second light guide body and comprises a diffusion microstructure. The first light sources are disposed on opposite sides of the first light guide in a first direction. The second light sources are disposed on opposite sides of the second light guide in the second direction. The third light source is arranged below the first light guide body.

Description

Technical Field

[0001] The present invention relates to a display device and an operation method thereof, and particularly to a display device with an anti-peeping function and an operation method thereof. Background Art

[0002] Display devices have advantages such as being thin, light, and having low power consumption, and have been widely used in various electronic products, such as desktop computers (Desktop PC), notebooks (Notebook), tablet computers (Tablet PC), smart phones (SmartPhone), etc. With the improvement of users' requirements for information security and privacy, the anti-peeping effect of display devices has received increasing attention. Therefore, one of the purposes of the present invention is to enable the display device to have a better anti-peeping effect. Summary of the Invention

[0003] The purpose of the present invention is to provide a display device and an operation method thereof, and the technical problem to be solved is to enable the display device to have a better anti-peeping effect.

[0004] To solve the above technical problem, the present invention provides a display device, which includes a display panel, a light control module, a first light source, a second light source, and a third light source. The light control module is disposed under the display panel, and the light control module includes a first light guide, a second light guide, and a diffusion structure. The first light guide includes a plurality of first microstructures, the first microstructures extend along a first direction and are arranged along a second direction, the first direction and the second direction are perpendicular, in the second direction, there is a first distance between two adjacent first microstructures, and the first distance gradually decreases from the opposite two edges of the first light guide in the second direction into the first light guide. The second light guide is disposed on the first light guide, the second light guide includes a plurality of second microstructures, the second microstructures extend along the second direction and are arranged along the first direction, in the first direction, there is a second distance between two adjacent second microstructures, and the second distance gradually decreases from the opposite two edges of the second light guide in the first direction into the second light guide. The diffusion structure is disposed on the second light guide and includes a plurality of diffusion microstructures, and each diffusion microstructure includes a curved surface. The first light source is disposed on the opposite two sides of the first light guide in the first direction. The second light source is disposed on the opposite two sides of the second light guide in the second direction. The third light source is disposed under the first light guide.

[0005] To solve the above technical problems, the present invention further provides an operation method for a display device, which includes the following steps. First, provide a display device, which includes a display panel, a light control module, a first light source, a second light source, and a third light source. The light control module is disposed under the display panel, and the light control module includes a first light guide, a second light guide, and a diffusion structure. The first light guide includes a plurality of first microstructures, and the first microstructures extend along a first direction. The second light guide is disposed on the first light guide and includes a plurality of second microstructures, and the second microstructures extend along a second direction, and the first direction and the second direction are perpendicular. The diffusion structure is disposed on the second light guide and includes a plurality of diffusion microstructures, and each diffusion microstructure includes a curved surface. The first light source is disposed on opposite sides of the first light guide in the first direction. The second light source is disposed on opposite sides of the second light guide in the second direction. The third light source is disposed under the first light guide. Then, turn on one of the first light source and the second light source, and turn on at least a part of the third light source or turn off the third light source.

[0006] In the display device and its operation method of the present invention, through the position and direction of light of the first light source and through the shape design of the first microstructures in the first light guide, a viewing angle prevention effect in the second direction can be provided for the picture. Through the position and direction of light of the second light source and through the shape design of the second microstructures in the second light guide, a viewing angle prevention effect in the first direction can be provided for the picture, and the picture provided by the third light source may not have a viewing angle prevention effect. In addition, by operating different light sources, effects of local picture viewing angle prevention, full picture viewing angle prevention, and full picture non-viewing angle prevention can be achieved. Therefore, through the design of the light sources and light guides of the present invention, the display device can have a more diverse and better viewing angle prevention effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a schematic cross-sectional view of the display device according to the first embodiment of the present invention.

[0008] Figure 2 It is a top view schematic diagram of the first light guide of the display device according to the first embodiment of the present invention.

[0009] Figure 3 is Figure 2 a schematic cross-sectional view of the tangent line A-A' in [].

[0010] Figure 4 is Figure 2 a schematic cross-sectional view of the tangent line B-B' in [].

[0011] Figure 5 It is a perspective schematic diagram of the first light guide of the display device according to the first embodiment of the present invention.

[0012] Figure 6Measurement results of the viewing angles of Example (i) and Example (ii) of the display device of the present invention.

[0013] Figure 7 Top view schematic diagram of the second light guide of the display device of the first embodiment of the present invention.

[0014] Figure 8 For Figure 7 Schematic cross-sectional view of the tangent line C-C' in

[0015] Figure 9 For Figure 7 Schematic cross-sectional view of the tangent line D-D' in

[0016] Figure 10 Top view schematic diagram of the diffusion structure of the display device of the first embodiment of the present invention.

[0017] Figure 11 Schematic cross-sectional view of the diffusion microstructure of the display device of the first embodiment of the present invention.

[0018] Figure 12 Measurement results of the viewing angles of the picture provided by the third light source of the display device of the present invention.

[0019] Figure 13 Flowchart of the steps of the operation method of the display device of the first embodiment of the present invention.

[0020] Figure 14 Schematic diagram when a part of the picture has an anti-peeping effect in the operation method of the display device of the first embodiment of the present invention.

[0021] Figure 15 Perspective view of the first light guide of the display device of the second embodiment of the present invention.

[0022] Figure 16 Top view schematic diagram of the first light guide of the display device of the third embodiment of the present invention.

[0023] Figure 17 Schematic cross-sectional view of the first unit of the third embodiment of the present invention.

[0024] Figure 18 Top view schematic diagram of the second light guide of the display device of the third embodiment of the present invention.

[0025] Figure 19 Schematic cross-sectional view of the first unit of the fourth embodiment of the present invention.

[0026] Description of reference numerals: 1~display device; 10~display panel; 100, 102~substrate; 104~flexible circuit board; 106~first light guide; 108~second light guide; 110~diffusion structure; 112~first microstructure; 114~second microstructure; 116~diffusion microstructure; 1161~bottom; 1163~top; 118, 1180, 1182~first unit; 12~optical film layer; 120~second unit; 14~light control module; 16~first light source; 18~second light source; 20~third light source; AS~arc surface; CL1, CL2, CL3, CL4~center line; D1, D2~depth; DR1, DR2, DR3~direction; E11-E14, E21-E24, E31-E34~edge; F12, F14, F22, F24~end; G11-G16~first pitch; G21-G26~second pitch; G31-G36~third pitch; G41-G46~fourth pitch; H1~height; IS1~first inclined surface; IS2~second inclined surface; LB, LC~light; P1~first part; P2~second part; PC~picture; R1, Q1~first region; R2, Q2~second region; S101, S103, S105~step; SS, SS1, SS2~side; TL1, TL2~intersection line; U11-U16, U21, U23, U25~unit pitch; Y1, Y2, Y3, Z1, Z2~included angle. Detailed implementation manners

[0027] To enable those of ordinary skill in the art to further understand the present invention, the following particularly list the preferred embodiments of the present invention and describe in detail the composition and the achieved effects of the present invention in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all simplified schematic diagrams. Therefore, only the elements and combination relationships related to the present invention are shown to provide a clearer description of the basic architecture or implementation method of the present invention, while the actual elements and layouts may be more complex. In addition, for the convenience of description, the elements shown in the accompanying drawings of the present invention are not drawn in an equal proportion according to the actual number, shape, and size. The detailed proportions can be adjusted according to the design requirements.

[0028] In the following accompanying drawings, a direction DR1, a direction DR2, and a direction DR3 are marked. The direction DR3 can be a normal direction or a top view direction. For example, Figure 1 , the direction DR3 can be perpendicular to an upper surface of a display device 1. For example, Figure 1 , the direction DR1 and the direction DR2 can be horizontal directions and can be perpendicular to the direction DR3, and the direction DR1 and the direction DR2 are different. For example, the direction DR1 can be perpendicular to the direction DR2. The following accompanying drawings can describe the spatial relationship of the structure according to the direction DR1, the direction DR2, and the direction DR3.

[0029] Please refer toFigures 1 to 14 , Figure 1 is a schematic cross-sectional view of a display device according to a first embodiment of the present invention, Figure 2 is a top view schematic diagram of a first light guide of the display device according to the first embodiment of the present invention, Figure 3 is Figure 2 a schematic cross-sectional view of the tangent line A-A' in Figure 4 is Figure 2 a schematic cross-sectional view of the tangent line B-B' in Figure 5 is a perspective view schematic diagram of a first light guide of the display device according to the first embodiment of the present invention, Figure 6 is the measurement result of the viewing angle of example (i) and example (ii) of the display device of the present invention, Figure 7 is a top view schematic diagram of a second light guide of the display device according to the first embodiment of the present invention, Figure 8 is Figure 7 a schematic cross-sectional view of the tangent line C-C' in Figure 9 is Figure 7 a schematic cross-sectional view of the tangent line D-D' in Figure 10 is a top view schematic diagram of a diffusion structure of the display device according to the first embodiment of the present invention, Figure 11 is a schematic cross-sectional view of a diffusion microstructure of the display device according to the first embodiment of the present invention, Figure 12 is the measurement result of the viewing angle of the picture provided by the third light source of the display device of the present invention, Figure 13 is a step flow chart of an operation method of the display device according to the first embodiment of the present invention, and Figure 14 is a schematic diagram when a part of the picture has an anti-peeping effect in the operation method of the display device according to the first embodiment of the present invention.

[0030] The display device 1 includes a display panel 10, an optical film layer 12, a light regulation module 14, a first light source 16, a second light source 18, and a third light source 20. The display panel 10 may be a liquid crystal display panel, but is not limited thereto. The display panel 10 may include a substrate 100, a substrate 102, and a flexible circuit board 104, but is not limited thereto. The substrate 100 may be disposed on the substrate 102, and the flexible circuit board 104 may be connected to one end of the substrate 102. The substrate 100 and the substrate 102 may include a rigid substrate such as a glass substrate, a quartz substrate, or a sapphire substrate, but are not limited thereto. The substrate 100 and the substrate 102 may also include a flexible substrate such as a polyimide (PI) substrate or a polyethylene terephthalate (PET) substrate, but are not limited thereto.

[0031] The light control module 14 is disposed under the display panel 10, and the optical film layer 12 is disposed between the light control module 14 and the display panel 10. The optical film layer 12 may include one or more sub-film layers to provide appropriate optical effects, but is not limited thereto. The light control module 14 includes a first light guide 106, a second light guide 108, and a diffusion structure 110. As Figure 1 , the first light guide 106 is disposed at the bottom of the light control module 14, the second light guide 108 is disposed on the first light guide 106, and the diffusion structure 110 is disposed on the second light guide 108.

[0032] As Figure 2 and Figure 5 , the first light guide 106 includes a plurality of first microstructures 112, and the first microstructures 112 may be disposed on the upper surface of the first light guide 106, but is not limited thereto. As Figure 2 , the first microstructures 112 extend along the direction DR1 and are arranged along the direction DR2. In the direction DR2, there is a first pitch between two adjacent first microstructures 112, and the first pitch gradually decreases from the two opposite edges E11 and E13 of the first light guide 106 in the direction DR2 into the first light guide 106. For example, a first pitch G11 may be greater than a first pitch G13, and the first pitch G13 may be greater than a first pitch G15. Also for example, a first pitch G12 may be greater than a first pitch G14, and the first pitch G14 may be greater than a first pitch G16.

[0033] As Figure 2 and Figure 5 , each of the first microstructures 112 in this embodiment includes a recess, but is not limited thereto. As Figure 3 and Figure 4 , the recess of the first microstructure 112 has a depth D1. As Figure 3 , in the direction DR1, the depth D1 gradually increases from the two ends F12 and F14 of the first microstructure 112 towards the center of the first microstructure 112. The above design of the first pitch and the depth of the recess can improve the uniformity of light distribution.

[0034] As Figure 1 , the first light source 16 is disposed on opposite sides of the first light guide 106 in the direction DR1. For example, the first light source 16 may be a side-entry light source and may include a plurality of light-emitting diodes disposed on opposite sides of the first light guide 106. Therefore, the light LB emitted by the first light source 16 can enter the first light guide 106 in the directions shown in Figure 2 and Figure 5 , and the direction of the light LB may be parallel to the extending direction of the first microstructures 112 (i.e., the direction DR1).

[0035] As Figure 1, the light emitted by the first light source 16 can pass through the first light guide 106 by refraction and reflection, and then sequentially pass through the second light guide 108 and the diffusion structure 110 upward and enter the display panel 10, and finally be viewed by the user. Through the position of the first light source 16 and the direction of the light, and through the design of the shape of the first microstructure 112 in the first light guide 106, the screen can be provided with the effect of being visible in the direction DR1 and the effect of anti-peeping in the direction DR2. The visible effect of the screen in the direction DR2 can be as follows according to Figure 2 and Figure 5 the design of the included angle between each surface of the first microstructure 112, and has the effects shown in the examples (i) and (ii) of Figure 6 . In the direction DR2 and the direction opposite to the direction DR2, the viewing angle of the example (i) can be less than or equal to 15 degrees or the viewing angle of the example (ii) can be less than or equal to 40 degrees.

[0036] As Figure 7 , the second light guide 108 includes a plurality of second microstructures 114, and the second microstructures 114 can be disposed on the upper surface of the second light guide 108, but not limited thereto. The second microstructures 114 extend in the direction DR2 and are arranged in the direction DR1. In the direction DR1, there is a second spacing between two adjacent second microstructures 114, and the second spacing gradually decreases from the opposite two edges E21 and E23 of the second light guide 108 in the direction DR1 into the second light guide 108. For example, a second spacing G21 can be greater than a second spacing G23, and the second spacing G23 can be greater than a second spacing G25. Also for example, a second spacing G22 can be greater than a second spacing G24, and the second spacing G24 can be greater than a second spacing G26.

[0037] Similar to the first microstructure 112, each second microstructure 114 of this embodiment also includes a recessed portion, but not limited thereto. As Figure 8 and Figure 9 , the recessed portion of the second microstructure 114 has a depth D2. As Figure 9 , in the direction DR2, the depth D2 gradually increases from the two ends F22 and F24 of the second microstructure 114 toward the center of the second microstructure 114. The above design of the second spacing and the depth of the recessed portion can improve the uniformity of the light distribution.

[0038] As Figure 1 , the second light source 18 is disposed on the opposite sides of the second light guide 108 in the direction DR2. For example, the second light source 18 can be a side-injection light source and can include a plurality of light-emitting diodes disposed on the opposite sides of the second light guide 108. Therefore, the light LC emitted by the second light source 18 can be as Figure 7enters the second light guide 108 in the indicated direction, and the direction of the light LC can be parallel to the extending direction of the second microstructure 114 (i.e., the direction DR2).

[0039] As Figure 1 , the light emitted by the second light source 18 can pass through the second light guide 108 through refraction and reflection, then pass upward through the diffusion structure 110 and enter the display panel 10, and finally be viewed by the user. By the position of the second light source 18 and the direction of the light and through the shape design of the second microstructure 114 in the second light guide 108, an effect that the picture is visible in the direction DR2 and an anti-peeping effect in the direction DR1 can be provided. The visible effect of the picture in the direction DR1 can be the effects shown in Examples (i) and (ii) of Figure 6 . In the direction DR1 and the direction opposite to the direction DR1, the viewing angle of Example (i) can be less than or equal to 15 degrees or the viewing angle of Example (ii) can be less than or equal to 40 degrees.

[0040] As Figure 10 , the diffusion structure 110 includes a plurality of diffusion microstructures 116, and the diffusion microstructures 116 can be disposed on the upper surface of the diffusion structure 110, but not limited thereto. As Figure 10 , in a top view, the shape of the diffusion microstructure 116 can be circular, but not limited thereto. As Figure 11 , in a cross-sectional view, each diffusion microstructure 116 can include a bottom 1161 and a top 1163. The bottom 1161 can be a rectangle and the width of the bottom 1161 can be greater than the width of the top 1163. The top 1163 is disposed on the bottom 1161 and the side surface of the top 1163 is an arc surface AS, but not limited thereto.

[0041] As Figure 10 , in the direction DR2, there is a third spacing between two adjacent diffusion microstructures 116, and the third spacing gradually increases from the two opposite edges E31 and E33 of the diffusion structure 110 in the direction DR2 into the diffusion microstructure 116. For example, a third spacing G31 can be less than a third spacing G33, and the third spacing G33 can be less than a third spacing G35. Also for example, a third spacing G32 can be less than a third spacing G34, and the third spacing G34 can be less than a third spacing G36.

[0042] In the direction DR1, there is a fourth spacing between two adjacent diffusion microstructures 116, and the fourth spacing gradually increases from the opposite two edges E32 and E34 of the diffusion structure 110 in the direction DR1 into the diffusion structure 110. For example, a fourth spacing G41 may be smaller than a fourth spacing G43, and the fourth spacing G43 may be smaller than a fourth spacing G45. Also for example, a fourth spacing G42 may be smaller than a fourth spacing G44, and the fourth spacing G44 may be smaller than a fourth spacing G46. The above arrangement design of the diffusion microstructures 116 can improve the uniformity of light distribution.

[0043] As Figure 1 , the third light source 20 is disposed under the first light guide 106. For example, the third light source 20 may be a direct - type light source and may include a plurality of light - emitting diodes disposed under the first light guide 106. Thus, the light emitted by the third light source 20 can enter the light control module 14 upward. For example, the light emitted by the third light source 20 can sequentially pass through the first light guide 106, the second light guide 108, and the diffusion structure 110 and then enter the display panel 10 and is finally viewed by the user. As Figure 12 , the viewing angle of the picture provided by the third light source 20 in different directions (such as in the direction DR1, the direction DR2, and other directions) can be less than or equal to 60 degrees. In other words, the picture of the display panel 10 provided by the third light source 20 does not have an anti - peeping effect in different directions within a viewing angle of 60 degrees.

[0044] As Figure 13 , the present invention also provides an operation method of the display device 1. It should be understood that Figure 13 the steps shown in Figure 13 may not be exhaustive, and other steps may be executed before, after, or between any of the shown steps. In addition, some steps may be executed simultaneously, or in an order different from the order shown in

[0045] Please refer to Figures 1 to 13, first, step S101 can be performed to provide a display device 1. The display device 1 includes a display panel 10, a light control module 14, a first light source 16, a second light source 18, and a third light source 20, but is not limited thereto. The light control module 14 is disposed under the display panel 10, and the light control module 14 includes a first light guide 106, a second light guide 108, and a diffusion structure 110. The first light guide 106 includes a first microstructure 112, and the first microstructure 112 extends along a direction DR1. The second light guide 108 is disposed on the first light guide 106 and includes a second microstructure 114, and the second microstructure 114 extends along a direction DR2. The diffusion structure 110 is disposed on the second light guide 108 and includes a diffusion microstructure 116, and each diffusion microstructure 116 includes an arc surface AS. The first light source 16 is disposed on opposite sides of the first light guide 106 in the direction DR1. The second light source 18 is disposed on opposite sides of the second light guide 108 in the direction DR2. The third light source 20 is disposed under the first light guide 106.

[0046] Next, step S103 can be performed to turn on one of the first light source 16 and the second light source 18, and step S105 can be performed to turn on at least a part of the third light source 20 or turn off the third light source 20.

[0047] As Figure 14 , a screen PC provided by the display panel 10 may include a first part P1 and a second part P2. Since the third light source 20 is a direct - down light source, a first region R1 in the third light source 20 may correspond to the first part P1 in the screen PC in the direction DR3, and a second region R2 in the third light source 20 may correspond to the second part P2 in the screen PC in the direction DR3.

[0048] In an example, the first light source 16 may be turned on, the second light source 18 may be turned off, the first region R1 in the third light source 20 may be turned on, and the second region R2 in the third light source 20 may be turned off. In the first part P1 of the screen PC, although the light of the first light source 16 and the first light guide 106 can make the screen have an anti - peeping effect, the light emitted after the first region R1 in the third light source 20 is turned on does not make the screen have an anti - peeping effect. Therefore, the first part P1 in the screen PC still does not have an anti - peeping effect.

[0049] In the second part P2 of the screen PC, the light of the first light source 16 and the first light guide 106 can make the screen have an anti-peeping effect, and the second area R2 in the third light source 20 is turned off. Therefore, the second part P2 in the screen PC can have an anti-peeping effect. Additionally, due to the position of the first light source 16 and the shape design of the first microstructure 112 in the first light guide 106, the second part P2 in the screen PC can have the effect of being visible in the direction DR1 and the effect of anti-peeping in the direction DR2.

[0050] In another example, the first light source 16 can be turned off, the second light source 18 can be turned on, the first area R1 in the third light source 20 can be turned on, and the second area R2 in the third light source 20 can be turned off. In the first part P1 of the screen PC, although the light of the second light source 18 and the second light guide 108 can make the screen have an anti-peeping effect, the light emitted after the first area R1 in the third light source 20 is turned on does not make the screen have an anti-peeping effect. Therefore, the first part P1 in the screen PC still does not have an anti-peeping effect.

[0051] In the second part P2 of the screen PC, the light of the second light source 18 and the second light guide 108 can make the screen have an anti-peeping effect, and the second area R2 in the third light source 20 is turned off. Therefore, the second part P2 in the screen PC can have an anti-peeping effect. Additionally, due to the position of the second light source 18 and the shape design of the second microstructure 114 in the second light guide 108, the second part P2 in the screen PC can have the effect of being visible in the direction DR2 and the effect of anti-peeping in the direction DR1.

[0052] Therefore, in the above two examples, when at least a part of the third light source 20 is turned on, the first area R1 in the third light source 20 is turned on and the second area R2 in the third light source 20 is turned off.

[0053] In another example, one of the first light source 16 and the second light source 18 can be turned on and the other of the first light source 16 and the second light source 18 can be turned off, and the third light source 20 can be turned off. Since both the first area R1 and the second area R2 in the third light source 20 are turned off, both the first part P1 and the second part P2 in the screen PC can have an anti-peeping effect, that is, the entire screen has an anti-peeping effect.

[0054] In another example, one of the first light source 16 and the second light source 18 can be turned on and the other of the first light source 16 and the second light source 18 can be turned off, and the third light source 20 can be fully turned on. When the third light source 20 is fully turned on, the brightness of the third light source 20 is less than 20% of the strongest brightness of the third light source 20. Although the anti-peeping effect of the picture PC is affected when the third light source 20 is turned on, when the brightness of the third light source 20 is less than 20% of the strongest brightness of the third light source 20, the picture PC still has the anti-peeping effect and the brightness of the picture PC can still be increased, thereby improving the quality of the picture PC.

[0055] However, the operation method of the display device 1 of the present invention is not limited to the above examples and can vary according to different requirements of the picture design.

[0056] The display device and its operation method of the present invention are not limited to the above embodiments. Other embodiments of the present invention will be further disclosed below. However, for the sake of simplifying the description and highlighting the differences between the embodiments, the same reference numerals are used to label the same components in the following text, and the repeated parts will not be described again. In addition, the following embodiments can all achieve the effects in the first embodiment.

[0057] Please refer to Figure 15 , Figure 15 FIG. is a perspective view of a first light guide of a display device according to a second embodiment of the present invention. The difference from the first embodiment is that each of the first microstructures 112 in this embodiment includes a protruding portion. As Figure 15 (Please refer to Figure 2 and Figure 7 ), the protruding portion of the first microstructure 112 has a height H1. In the direction DR1, the height H1 gradually increases from the two ends F12 and F14 of the first microstructure 112 towards the center of the first microstructure 112. In addition, each of the second microstructures 114 in this embodiment also includes a protruding portion. The protruding portion of the second microstructure 114 has a height, and in the direction DR2, the height gradually increases from the two ends F22 and F24 of the second microstructure 114 towards the center of the second microstructure 114.

[0058] Please refer to Figures 16 to 18 , Figure 16 FIG. is a top view of a first light guide of a display device according to a third embodiment of the present invention, Figure 17 FIG. is a cross-sectional view of a first unit according to a third embodiment of the present invention, and Figure 18A top view schematic diagram of the second light guide of the display device according to the third embodiment of the present invention. The difference from the first embodiment is that each first microstructure 112 in the first light guide 106 of this embodiment includes a plurality of first units 118. In each first microstructure 112, the first units 118 are arranged along the direction DR1, and there is a unit pitch between two adjacent first units 118, and the unit pitch gradually decreases from the opposite two edges E12 and E14 of the first light guide 106 in the direction DR1 into the first light guide 106. For example, a unit pitch U11 can be greater than a unit pitch U13, and the unit pitch U13 can be greater than a unit pitch U15. Also for example, a unit pitch U12 can be greater than a unit pitch U14, and the unit pitch U14 can be greater than a unit pitch U16.

[0059] On Figure 16 both sides of a center line CL1 in, the cross-sectional structures of adjacent first units 118 are as shown in Figure 17 a first unit 1180 and a first unit 1182 of. As shown in Figure 17 , each first unit (such as 1180 and 1182) includes a first inclined surface IS1 and a second inclined surface IS2, and the first inclined surface IS1 and the second inclined surface IS2 are connected. In this embodiment, the first inclined surface IS1 and the second inclined surface IS2 are connected to form a protruding portion, but not limited thereto. The slopes of the first inclined surface IS1 and the second inclined surface IS2 are different. The angle Z1 between the first inclined surface IS1 and the second inclined surface IS2 can be an acute angle, for example: 78 degrees, and the angle Z2 between the second inclined surface IS2 and a side surface SS can be an obtuse angle, for example: 147 degrees, but not limited thereto.

[0060] As shown in Figure 17 , the first inclined surface IS1 of the first unit 1180 and the first unit 1182 is arranged close to the center line CL1 while the second inclined surface IS2 of the first unit 1180 and the first unit 1182 is arranged away from the center line CL1, so the shapes of the first unit 1180 and the first unit 1182 are mirror-symmetrical with respect to the center line CL1.

[0061] As shown in Figure 16 , the first light guide 106 includes a first region Q1, a second region Q2 and a center line CL1 located between the first region Q1 and the second region Q2. The center line CL1 is parallel to the direction DR1, and the first region Q1 and the second region Q2 are located on opposite sides of the center line CL1 in the direction DR2. The shapes of the first units 118 arranged in the first region Q1 and the shapes of the first units 118 arranged in the second region Q2 are mirror-symmetrical with respect to the center line CL1.

[0062] On the other hand, the first light guide 106 may further include a center line CL2, the center line CL2 is parallel to the direction DR2, and the first units 118 disposed on opposite sides of the center line CL2 may also be mirror-symmetrical with respect to the center line CL2.

[0063] In addition, as Figure 16 , the first inclined surface IS1 and the second inclined surface IS2 of the first unit 118 are connected and have an intersection line TL1, and the intersection line TL1 is parallel to the direction DR1. Therefore, in this embodiment, the direction of the light LB emitted by the first light source 16 may be parallel to the arrangement direction of the first units 118 in the first microstructure 112 and the intersection line TL1 of the first units 118.

[0064] As Figure 18 , each second microstructure 114 in the second light guide 108 of this embodiment includes a plurality of second units 120. In each second microstructure 114, the second units 120 are arranged along the direction DR2. There is a unit pitch between two adjacent second units 120, and the unit pitch gradually decreases from the opposite two edges E22 and E24 of the second light guide 108 in the direction DR2 into the second light guide 108. For example, a unit pitch U21 may be greater than a unit pitch U23, and the unit pitch U23 may be greater than a unit pitch U25.

[0065] In addition, the shape of the second unit 120 may be the same as the shape of the first unit 118. The difference between the second unit 120 and the first unit 118 is that an intersection line TL2 between the first inclined surface IS1 and the second inclined surface IS2 of the second unit 120 is parallel to the direction DR2. Therefore, the direction of the light LC emitted by the second light source 18 may be parallel to the arrangement direction of the second units 120 in the second microstructure 114 and the intersection line TL2 of the second units 120.

[0066] In addition, the second light guide 108 may include a center line CL3 and a center line CL4, the center line CL3 is parallel to the direction DR2, the center line CL4 is parallel to the direction DR1, the second units 120 disposed on opposite sides of the center line CL3 may be mirror-symmetrical with respect to the center line CL3, and the second units 120 disposed on opposite sides of the center line CL4 may also be mirror-symmetrical with respect to the center line CL4.

[0067] Please refer to Figure 19 , Figure 19 is a cross-sectional schematic view of the first unit of the fourth embodiment of the present invention. The difference from the third embodiment is that the first inclined surface IS1 and the second inclined surface IS2 in the first unit 118 and the second unit 120 of this embodiment are connected to form a recess. Taking Figure 19Taking the first unit 1180 as an example, the slope of the first inclined surface IS1 is different from the slope of the second inclined surface IS2. The angle Y1 between the first inclined surface IS1 and the second inclined surface IS2 can be an acute angle, for example: 78 degrees. The angle Y2 between the second inclined surface IS2 and a side surface SS1 can be an acute angle, for example: 33 degrees. And the angle Y3 between the first inclined surface IS1 and a side surface SS2 can be an acute angle, for example: 45 degrees, but not limited thereto. In addition, the shapes of the first unit 1180 and the first unit 1182 are mirror-symmetrical with respect to the center line CL1. The second unit 120 also has the same design of the recessed part as the first unit 1180 and the first unit 1182.

[0068] In summary, in the display device and its operation method of the present invention, through the position of the first light source and the direction of light, and through the shape design of the first micro-structure in the first light guide, an anti-peeping effect in the second direction can be provided for the picture. Through the position of the second light source and the direction of light, and through the shape design of the second micro-structure in the second light guide, an anti-peeping effect in the first direction can be provided for the picture. And the picture provided by the third light source may not have an anti-peeping effect. In addition, by operating different light sources, the effects of local picture anti-peeping, full picture anti-peeping, and full picture non-anti-peeping can be achieved. Therefore, through the design of the light source and the light guide of the present invention, the display device can have more diverse and better anti-peeping effects.

[0069] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those of ordinary skill in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A display device, characterized in that, comprising: a display panel; a light control module disposed under the display panel, wherein the light control module comprises: a first light guide body including a plurality of first microstructures, the first microstructures extending along a first direction and arranged along a second direction, the first direction and the second direction being perpendicular, in the second direction, there is a first spacing between two adjacent first microstructures, and the first spacing gradually decreases from opposite edges of the first light guide body in the second direction towards the inside of the first light guide body; a second light guide body disposed on the first light guide body, the second light guide body including a plurality of second microstructures, the second microstructures extending along the second direction and arranged along the first direction, in the first direction, there is a second spacing between two adjacent second microstructures, and the second spacing gradually decreases from opposite edges of the second light guide body in the first direction towards the inside of the second light guide body; and a diffusion structure body disposed on the second light guide body and including a plurality of diffusion microstructures, wherein each of the diffusion microstructures includes a curved surface; a first light source disposed on opposite sides of the first light guide body in the first direction; a second light source disposed on opposite sides of the second light guide body in the second direction; and a third light source disposed under the first light guide body.

2. The display device according to claim 1, characterized in that, each of the first microstructures includes a protrusion having a height, and in the first direction, the height gradually increases from both ends of the first microstructure towards the center of the first microstructure.

3. The display device according to claim 1, characterized in that, each of the first microstructures includes a recess having a depth, and in the first direction, the depth gradually increases from both ends of the first microstructure towards the center of the first microstructure.

4. The display device according to claim 1, characterized in that, each of the first microstructures includes a plurality of first units, and the first units are arranged along the first direction.

5. The display device according to claim 4, characterized in that, there is a unit spacing between two adjacent first units, and the unit spacing gradually decreases from opposite edges of the first light guide body in the first direction towards the inside of the first light guide body.

6. The display device according to claim 4, characterized in that, each of the first units includes a first inclined surface and a second inclined surface, the first inclined surface and the second inclined surface are connected, and the slopes of the first inclined surface and the second inclined surface are different.

7. The display device according to claim 6, characterized in that, the first inclined surface and the second inclined surface are connected to form a protrusion or a recess.

8. The display device according to claim 4, characterized in that, The first light guide includes a first region, a second region, and a center line located between the first region and the second region. The center line is parallel to the first direction. The first region and the second region are located on opposite sides of the center line, and the shapes of the first units disposed in the first region and the shapes of the first units disposed in the second region are mirror-symmetrical with respect to the center line.

9. The display device according to claim 8, wherein, the first inclined surface and the second inclined surface are connected to form a protruding portion or a recessed portion. The slope of the first inclined surface is smaller than the slope of the second inclined surface, and the first inclined surface is disposed close to the center line while the second inclined surface is disposed away from the center line.

10. A method for operating a display device, wherein, comprises: providing a display device, including: a display panel; a light control module disposed under the display panel, wherein the light control module includes: a first light guide including a plurality of first microstructures extending along a first direction; a second light guide disposed on the first light guide and including a plurality of second microstructures extending along a second direction, and the first direction and the second direction are perpendicular; and a diffusion structure disposed on the second light guide and including a plurality of diffusion microstructures, wherein each of the diffusion microstructures includes a curved surface; a first light source disposed on opposite sides of the first light guide in the first direction; a second light source disposed on opposite sides of the second light guide in the second direction; and a third light source disposed under the first light guide; turning on one of the first light source and the second light source; and turning on at least a part of the third light source or turning off the third light source.

11. The method for operating a display device according to claim 10, wherein, when at least a part of the third light source is turned on, a first region of the third light source is turned on and a second region of the third light source is turned off.

12. The method for operating a display device according to claim 10, wherein, when the third light source is fully turned on, the brightness of the third light source is less than 20% of the maximum brightness of the third light source.

13. The method for operating a display device according to claim 10, wherein, the first microstructures are arranged along the second direction. In the second direction, there is a first pitch between two adjacent first microstructures, and the first pitch gradually decreases from opposite edges of the first light guide in the second direction towards the inside of the first light guide.

14. The method for operating a display device according to claim 10, wherein, the second microstructures are arranged along the first direction. In the first direction, there is a second pitch between two adjacent second microstructures, and the second pitch gradually decreases from opposite edges of the second light guide in the first direction towards the inside of the second light guide.

Images