Anti-peeping display device and automotive anti-peeping display device

Abstract

The invention discloses a peep-proof display device. The peep-proof display device comprises a backlight module, a display panel, a first visual angle control film and a light guide film, the backlight module comprises a plurality of light-emitting elements. The display panel overlaps the backlight module. The first viewing angle control film is located between the display panel and the backlight module and has a plurality of first openings, wherein the plurality of first openings respectively overlap a plurality of first light-emitting elements in the plurality of light-emitting elements. The light guide film is located between the display panel and the backlight module and has a plurality of second openings, wherein the plurality of second openings respectively overlap a plurality of second light-emitting elements in the plurality of light-emitting elements. In addition, the invention further provides a peep-proof display device for the vehicle.

Description

Technical Field

[0001] This invention relates to a display device, and more particularly to a privacy display device and a privacy display device for vehicles. Background Technology

[0002] Display devices typically feature wide viewing angles to allow multiple viewers to watch simultaneously. However, in certain situations or occasions, it is necessary to restrict the viewing direction. For example, the demand for in-vehicle privacy screens has been gradually increasing in recent years, mainly to block the driver's view (i.e., driver's side privacy) while the front passenger enjoys the audio-visual facilities, so as not to affect the driver's attention.

[0003] In addition, to meet the high image quality and high dynamic range requirements of high-end displays, one current approach is to use local dimming technology. This divides the backlight area into multiple independent sub-areas and adjusts the brightness of each sub-area according to the content of the image. For example, reducing the backlight brightness of dark areas makes the image appear darker to the user, while increasing the backlight brightness of bright areas improves the overall contrast and dynamic range of the image.

[0004] Recently, major automakers have successively proposed stricter privacy protection specifications. After evaluation, Dual-BLU technology is relatively able to balance the brightness specifications of privacy mode and sharing mode. However, since Dual-BLU technology requires the use of side-lit backlight, it cannot provide local dimming functionality in both privacy and sharing modes simultaneously. Summary of the Invention

[0005] This invention provides a privacy display device that can provide local dimming functionality while maintaining brightness specifications for both privacy and sharing modes.

[0006] This invention provides a vehicle privacy display device that can provide local dimming functionality while maintaining brightness specifications for both privacy and sharing modes.

[0007] An anti-peeping display device of the present invention includes a backlight module, a display panel, a first viewing angle control film, and a light guide film. The backlight module includes multiple light-emitting elements. The display panel overlaps the backlight module. The first viewing angle control film is located between the display panel and the backlight module and has multiple first openings, wherein the multiple first openings respectively overlap multiple first light-emitting elements. The light guide film is located between the display panel and the backlight module and has multiple second openings, wherein the multiple second openings respectively overlap multiple second light-emitting elements.

[0008] A vehicle privacy display device according to the present invention includes a backlight module, a display panel, a first viewing angle control film, and a light guide film. The backlight module is disposed on the vehicle body and includes multiple light-emitting elements. The display panel overlaps the backlight module. The first viewing angle control film is located between the display panel and the backlight module and has multiple first openings, wherein the multiple first openings respectively overlap multiple first light-emitting elements. The light guide film is located between the display panel and the backlight module and has multiple second openings, wherein the multiple second openings respectively overlap multiple second light-emitting elements. Attached Figure Description

[0009] Figure 1 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0010] Figure 2 This is a schematic top view of the backlight module of a display device according to an embodiment of the present invention.

[0011] Figure 3A This is a schematic cross-sectional view of the display panel of a display device according to an embodiment of the present invention.

[0012] Figure 3B This is a schematic perspective view of the display panel of a display device according to another embodiment of the present invention.

[0013] Figure 3C This is a schematic perspective view of the display panel of a display device according to another embodiment of the present invention.

[0014] Figure 4A This is a schematic perspective view of a viewing angle control film of a display device according to an embodiment of the present invention.

[0015] Figure 4B This is a schematic perspective view of the light guide film of a display device according to an embodiment of the present invention.

[0016] Figure 5 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0017] Figure 6 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0018] Figure 7 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0019] Figure 8 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0020] Figure 9 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0021] Figure 10 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0022] Figure 11 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0023] Figure 12 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0024] Figure 13 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0025] Figure 14 This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0026] Figure 15A This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0027] Figure 15B This is a schematic top view of the backlight module of a display device according to an embodiment of the present invention.

[0028] Figure 15C This is a schematic cross-sectional view of the light guide film of a display device according to an embodiment of the present invention.

[0029] Figure 16A This is a schematic cross-sectional view of a display device according to an embodiment of the present invention.

[0030] Figure 16B This is a schematic top view of the backlight module of a display device according to an embodiment of the present invention.

[0031] In the attached figures, the following labels are used:

[0032] 10~60: Display device

[0033] 110, 510, 610: Backlight modules

[0034] 111:Substrate

[0035] 112, 113, 512, 612: Light-emitting elements

[0036] 114: Reflector

[0037] 115: Diffusion Sheet

[0038] 116: Collimation membrane

[0039] 120, 120A, 120B, 120C: Display panels

[0040] 130: View control membrane

[0041] 132: Light-blocking structure

[0042] 134: Light-transmitting structure

[0043] 140: Light guide film

[0044] 142: Base Plate

[0045] 142S: Surface

[0046] 144: Prism Structure

[0047] 150: Brightening Film

[0048] 210, 220:Substrate

[0049] 230: Display medium layer

[0050] 240, 250: Electrodes

[0051] 242: Slit

[0052] 305, 305': Collimation membrane

[0053] 310, 320:Substrate

[0054] 330: Display medium layer

[0055] 340, 350, 370: Electrodes

[0056] 340a: Slit

[0057] 342, 352: Branches

[0058] 380: Insulation layer

[0059] 405, 405', 530, 630: Viewing angle control film

[0060] 540, 640: Light guide film

[0061] 542, 544: Prism structure

[0062] A1, A2: Display area

[0063] BD: Boundary

[0064] C11, C21…Cm1: Primary column

[0065] C12, C22…Cm2: Sub-columns

[0066] D1, D2, x, y, z: Direction

[0067] N: Normal direction

[0068] O1, O2, O3, O4: Open

[0069] P1, P2: Pitch

[0070] R1, R1': Light rays

[0071] R112, R113: Emitted light

[0072] R112', R113': light out

[0073] W1, W2, W3: Width

[0074] θ1, θ1': Vertex angle

[0075] θ2, θ3, θ5, θ6, θ7, θ8: base angle

[0076] θ4: included angle Detailed Implementation

[0077] In the accompanying drawings, the thicknesses of layers, films, panels, regions, etc., are enlarged for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected" to another element, it may be directly on or connected to the other element, or intermediate elements may also be present. Conversely, when an element is referred to as being "directly on" or "directly connected" to another element, no intermediate elements are present. As used herein, "connection" can refer to a physical and / or electrical connection. Furthermore, "electrical connection" or "coupling" may refer to the presence of other elements between two elements.

[0078] It should be understood that although the terms "first," "second," "third," etc., may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or part from another. Therefore, the first "element," "component," "region," "layer," or "part" discussed below may be referred to as a second element, component, region, layer, or part without departing from the teachings of this document.

[0079] The terminology used herein is for the purpose of describing particular embodiments only and is not restrictive. As used herein, unless the content clearly indicates otherwise, the singular forms "a," "an," and "the" are intended to include the plural forms, including "at least one" or indicating "and / or." As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. It should also be understood that, when used in this specification, the terms "comprising" and / or "including" specify the presence of the stated features, areas, integrals, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, areas, integrals, steps, operations, elements, components, and / or combinations thereof.

[0080] Furthermore, relative terms such as "down" or "bottom" and "up" or "top" may be used herein to describe the relationship between one element and another, as illustrated in the figures. It should be understood that relative terms are intended to include different orientations of the device beyond those shown in the figures. For example, if a device in one figure is flipped, an element described as being "down" of another element will be oriented "up" of that element. Thus, the exemplary term "down" can include both "down" and "up" orientations, depending on the specific orientation of the figure. Similarly, if a device in one figure is flipped, an element described as being "down" or "below" of another element will be oriented "above" that element. Thus, the exemplary terms "down" or "below" can include both "up" and "down" orientations.

[0081] Given the specific number of measurements discussed and the associated errors (i.e., limitations of the measurement system), the terms "about," "approximately," "generally," or "substantially" as used herein include the value and the average value within an acceptable range of deviations from the specific value as determined by one of ordinary skill in the art. For example, "about" may mean within one or more standard deviations of the value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, the terms "about," "approximately," "generally," or "substantially" as used herein may be chosen to select a more acceptable range of deviations or standard deviations depending on the optical, etched, or other properties, and a single standard deviation may not be applicable to all properties.

[0082] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having the same meaning as they have in the context of the relevant technology and the invention, and will not be interpreted as having an idealized or overly formal meaning unless expressly defined herein.

[0083] This document describes exemplary embodiments with reference to cross-sectional views, which are schematic diagrams of idealized embodiments. Therefore, variations in shape as a result of, for example, manufacturing techniques and / or tolerances, are expected in the illustrations. Consequently, the embodiments described herein should not be construed as limited to the specific shapes of the regions shown herein, but rather include, for example, shape deviations caused by manufacturing processes. For example, regions shown or described as flat may generally have rough and / or non-linear characteristics. Furthermore, the acute angles shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to show the precise shapes of the regions, nor are they intended to limit the scope of the claims.

[0084] Figure 1 This is a schematic cross-sectional view of a display device 10 according to an embodiment of the present invention. Please refer to... Figure 1 The display device 10 may include a backlight module 110, a display panel 120, a viewing angle control film 130, and a light guide film 140, wherein the viewing angle control film 130 and the light guide film 140 are located between the backlight module 110 and the display panel 120. Hereinafter, with reference to the drawings, embodiments of the various components of the display device 10 will continue to be described, but the present invention is not limited thereto.

[0085] Figure 2 This is a schematic top view of the backlight module 110 of a display device 10 according to an embodiment of the present invention. To make the illustration clearer, Figure 2 omitted in Figure 1 Some components of the backlight module 110 shown in the image.

[0086] Please refer to Figure 1 and Figure 2 The backlight module 110 can be a direct-lit backlight module. For example, the backlight module 110 includes a substrate 111 and light-emitting elements 112 and 113 disposed on the substrate 111, and a display panel 120 is superimposed on the backlight module 110, with the light-emitting elements 112 and 113 located between the display panel 120 and the substrate 111. The substrate 111 can be a circuit board, and the light-emitting elements 112 and 113 can be electrically connected to the substrate 111. For example, the substrate 111 includes a base plate, a circuit structure (not shown) disposed within the base plate, and a pad (not shown) disposed on the upper surface of the base plate, wherein the pad can be electrically connected to the circuit structure within the base plate, and the light-emitting elements 112 and 113 can be electrically connected to the pad on the surface of the base plate. In some embodiments, the substrate 111 may be made of glass, quartz, polymer, or other suitable materials to form its base plate.

[0087] The light-emitting elements 112 can be arranged in an array on the substrate 111. For example, the light-emitting elements 112 are arranged in multiple main columns C11, C21...Cm1, wherein the light-emitting elements 112 in each main column C11, C21...Cm1 are arranged along direction D1, and the multiple main columns C11, C21...Cm1 are arranged along direction D2, which may intersect with direction D1. In some embodiments, direction D2 may be orthogonal to direction D1, in other words, direction D2 may be perpendicular to direction D1.

[0088] The light-emitting elements 113 can also be arranged in an array on the substrate 111. For example, the light-emitting elements 113 are arranged in multiple sub-columns C12, C22...Cm2, wherein the light-emitting elements 113 in each sub-column C12, C22...Cm2 are arranged along direction D1, and the multiple sub-columns C12, C22...Cm2 are arranged along direction D2.

[0089] In some embodiments, the plurality of main columns C11, C21…Cm1 of the light-emitting element 112 and the plurality of sub-columns C12, C22…Cm2 of the light-emitting element 113 are arranged alternately along direction D2. In some embodiments, the pitch P1 of the plurality of main columns C11, C21…Cm1 of the light-emitting element 112 in direction D2 is equal to or approximately the pitch P2 of the plurality of sub-columns C12, C22…Cm2 of the light-emitting element 113 in direction D2. In some embodiments, the light-emitting elements 112 and 113 may be light-emitting elements with similar structures. In some embodiments, the light-emitting elements 112 and 113 are, for example, miniature light-emitting diodes (μLEDs), but are not limited thereto. The emission wavelength range of the light-emitting element 112 and the emission wavelength range of the light-emitting element 113 may be the same or different. In some embodiments, the emission wavelength range of the light-emitting element 112 and the emission wavelength range of the light-emitting element 113 are exactly the same or mostly the same.

[0090] Please refer to Figure 1 In some embodiments, the backlight module 110 further includes a reflective sheet 114 for reflecting the emitted light from the light-emitting elements 112 and 113. The reflective sheet 114 may be located on the side of the light-emitting elements 112 and 113 of the backlight module 110 opposite to the display panel 120. For example, when the display panel 120 is located above the light-emitting elements 112 and 113 of the backlight module 110, the reflective sheet 114 may be located below the light-emitting elements 112 and 113 of the backlight module 110. In this way, the reflective sheet 114 can reflect the portion of the emitted light from the light-emitting elements 112 and 113 that travels downwards towards the reflective sheet 114 toward the display panel 120.

[0091] In some embodiments, the backlight module 110 further includes a diffuser 115, which may be located between the light-emitting elements 112 and 113 and the viewing angle control film 130, and between the light-emitting elements 112 and 113 and the light guide film 140, to diffuse the emitted light from the light-emitting elements 112 and 113 into a surface light source with uniform brightness on the substrate 111. In some embodiments, the diffuser 115 may also diffuse the light reflected by the reflector 114 into a surface light source with uniform brightness. In some embodiments, the surface light source exiting the diffuser 115 after passing through it has a brightness uniformity of more than 95%.

[0092] In some embodiments, the backlight module 110 further includes a collimating film 116, which can guide light that would otherwise be scattered at a large angle to a narrower forward angle, thereby enhancing the intensity of light visible from the front. In other words, the collimating film 116 can reduce the scattering angle and concentrate the scattered light towards the frontal viewing angle to provide a light-gathering and brightening effect. For example, the collimating film 116 includes a prism sheet, which can refract, reflect, and concentrate light to enhance brightness. In some embodiments, the collimating film 116 can increase brightness by approximately 40% to 60%. In some embodiments, the collimating film 116 provides the effect of vertical light gathering, so that the light pattern after gathering has a horizontal elliptical profile, that is, the major axis of the elliptical profile is approximately horizontal. In some embodiments, the collimating film 116 is located between the diffuser 115 and the viewing angle control film 130, and between the diffuser 115 and the light guide film 140.

[0093] The display panel 120 may overlap with the backlight module 110 to receive a surface light source from the backlight module 110. The display panel 120 may be a liquid crystal display panel. Figure 3A This is a schematic cross-sectional view of the display panel 120A of the display device 10 according to an embodiment of the present invention. In some embodiments, Figure 1 The display panel 120 in the display device 10 shown may have, for example: Figure 3A The structure of the display panel 120A shown is illustrated.

[0094] Please refer to Figure 3A The display panel 120A may include a substrate 210, a substrate 220, and a display medium layer 230 sandwiched between the substrate 220 and the substrate 210. The substrates 210 and 220 are light-transmitting substrates, and their materials include glass, quartz, polymer, or other suitable materials. The display medium layer 230 may be made of liquid crystal or other materials that can be driven by an electric field to modulate light.

[0095] Display panel 120A may further include electrodes 240 and 250. Electrode 240 may be disposed between substrate 210 and display medium layer 230. Electrode 250 may be disposed between substrate 220 and display medium layer 230. Electrodes 240 and 250 cooperate with each other to provide a driving electric field for driving display medium layer 230. In some embodiments, electrode 240 includes a plurality of slits 242. In some embodiments, display panel 120A may be suitable for liquid crystal modes such as twisted nematic (TN), electrically controlled birefringence (ECB), or super twisted nematic (STN).

[0096] Figure 3B This is a schematic cross-sectional view of the display panel 120B of the display device 10 according to another embodiment of the present invention. In some embodiments, Figure 1 The display panel 120 of the display device 10 shown may have, for example: Figure 3B The structure of the display panel 120B shown is illustrated. Please refer to [reference needed]. Figure 3B The display panel 120B may include a substrate 310, a substrate 320, and a display medium layer 330 sandwiched between the substrates 310 and 320. The substrates 310 and 320 are light-transmitting substrates, and their materials include glass, quartz, polymer, or other suitable materials. The display medium layer 330 is made of liquid crystal or other materials that can be driven by an electric field to modulate light.

[0097] The display panel 120B may further include electrodes 340 and 350 disposed on the substrate 310. The electrode 340 may have a plurality of slits 340a, and the orthographic projections of the plurality of slits 340a onto the substrate 310 may overlap with the orthographic projections of the electrode 350 onto the substrate 310. In other words, the display panel 120B is suitable for in-plane switching (IPS) liquid crystal modes.

[0098] For example, electrode 340 has multiple branches 342 defining multiple slits 340a, and electrode 350 has multiple branches 352. The multiple branches 342 and 352 extend in the y-direction and are alternately arranged in the x-direction. The orthographic projection of the slits 340a defined by two adjacent branches 342 onto the substrate 310 overlaps with the orthographic projection of the corresponding branch 352 onto the substrate 310. In some embodiments, the multiple branches 342 and 352 may be substantially disposed on the same surface, but the invention is not limited thereto. In some embodiments, the width W1 of branch 342 in the x-direction and the width W2 of branch 352 in the x-direction may be substantially the same, but the invention is not limited thereto. In some embodiments, the multiple branches 342 and 352 have multiple gaps, and the multiple gaps may have multiple widths W3 in the x-direction that are substantially the same, but the invention is not limited thereto.

[0099] Electrodes 340 and 350 may be light-transmitting electrodes. For example, the material of electrodes 340 and / or 350 may be a metal oxide, such as indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, indium germanium zinc oxide, other suitable oxides, or a stacked layer of at least two of the above, but not limited thereto.

[0100] Figure 3C This is a schematic cross-sectional view of the display panel 120C of the display device 10 according to another embodiment of the present invention. In some embodiments, Figure 1 The display panel 120 of the display device 10 shown may have, for example: Figure 3C The structure of the display panel 120C shown is illustrated. Please refer to [reference needed]. Figure 3C The display panel 120C may include a substrate 310, a substrate 320, a display medium layer 330 sandwiched between the substrate 310 and the substrate 320, and electrodes 340 and 370 disposed between the substrate 310 and the display medium layer 330.

[0101] With Figure 3B Compared to the display panel 120B shown, Figure 3C The main difference in the structure of the display panel 120C is that the electrode 370 of the display panel 120C is a surface electrode, and the display panel 120C also includes an insulating layer 380 located between the electrode 340 and the electrode 370. The insulating layer 380 can be disposed on the electrode 370, and the multiple branches 342 of the electrode 340 can be disposed on the insulating layer 380. In other words, the display panel 120C is suitable for fringe field switching (FFS) liquid crystal mode.

[0102] The viewing angle control film 130 of the display device 10 can be located between the backlight module 110 and the light guide film 140. The viewing angle control film 130 can deflect light to the front viewing angle direction to provide light-gathering and privacy protection effects. In some embodiments, the viewing angle control film 130 has a plurality of openings O1, and the plurality of openings O1 overlap the light-emitting elements 112 of the backlight module 110 respectively. In this way, the light emitted by the light-emitting element 112 will pass through the openings O1 of the viewing angle control film 130, so the viewing angle control film 130 will not adjust the direction of travel of the light emitted by the light-emitting element 112, while the light emitted by the light-emitting element 113 will pass through the viewing angle control film 130, so the viewing angle control film 130 can gather the light emitted by the light-emitting element 113, further concentrating it to the front viewing angle direction. In some embodiments, the viewing angle control film 130 can concentrate the light emitted by the light-emitting element 113 in the left-right direction to the front viewing angle direction, thereby providing left and right privacy protection effects.

[0103] Figure 4A This is a schematic perspective view of the viewing angle control film 130 of a display device 10 according to an embodiment of the present invention. Please refer to... Figure 4A The viewing angle control film 130 may include a privacy screen layer, which may have, for example, a plurality of light-blocking structures 132 and a plurality of light-transmitting structures 134. The plurality of light-blocking structures 132 and the plurality of light-transmitting structures 134 are alternately arranged in the x-direction, and adjacent light-blocking structures 132 are separated from each other by a light-transmitting structure 134. In some embodiments, each light-blocking structure 132 may be a columnar structure extending in the y-direction, wherein the x-direction intersects the y-direction, but the invention is not limited thereto. In some embodiments, the inner diameter of the opening O1 is approximately 10 to 10,000 times, for example, approximately 100 to 1,000 times, or for example, approximately 400 to 800 times, the total width of a light-blocking structure 132 and a light-transmitting structure 134 along the x-direction. In other embodiments, the viewing angle control film 130 may also have other structures.

[0104] The light guide film 140 of the display device 10 can be located between the viewing angle control film 130 and the display panel 120. The light guide film 140 can deflect light in a specific direction to provide a screen sharing effect in that direction. In some embodiments, the light guide film 140 has a plurality of openings O2, and the plurality of openings O2 overlap the light-emitting elements 113 of the backlight module 110. In this way, the light emitted by the light-emitting element 113 passes through the openings O2 of the light guide film 140, so the light guide film 140 does not adjust the direction of travel of the light emitted by the light-emitting element 113, while the light emitted by the light-emitting element 112 passes through the light guide film 140, so the light guide film 140 can adjust the direction of travel of the light emitted by the light-emitting element 112 and deflect it in a specific direction. For example, the light guide film 140 can deflect the light emitted by the light-emitting element 112 away from the side window of the vehicle, thereby improving the problem of reflection from the side window of the vehicle.

[0105] Figure 4B This is a schematic perspective view of the light guide film 140 of a display device 10 according to an embodiment of the present invention. Please refer to... Figure 4B The light guide film 140 may include a base plate 142 and a plurality of prism structures 144 disposed on the surface of the base plate 142. In some embodiments, the plurality of prism structures 144 are arranged in an array on the surface of the base plate 142. The prism structure 144 may be a triangular prism structure, but is not limited thereto. For example, the prism structure 144 is a columnar triangular prism extending above the base plate 142 along the y direction, with the x, y, and z directions orthogonal to each other. In a cross-sectional view of the prism structure 144 in the xz plane, the prism structure 144 has a apex angle θ1, a base angle θ2, and a base angle θ3, wherein the base angle θ2 may be opposite to the base angle θ3. In some embodiments, the base angle θ2 is not equal to the base angle θ3, so that the prism structure 144 can deflect the light ray R1 entering the prism structure 144 in the normal direction N of the surface 142S of the base plate 142 to a specific direction, so that it does not leave the prism structure 144 in the normal direction N. For example, when the base angle θ2 is less than the base angle θ3, the prism structure 144 can cause a ray R1 entering the prism structure 144 in the normal direction N to pass through the prism structure 144 and become ray R1' leaving the prism structure 144, with an angle θ4 between the direction of travel of ray R1' and the normal direction N. In some embodiments, the apex angle θ1 of the prism structure 144 is less than 90 degrees, for example, the apex angle θ1 is about 40 degrees to 80 degrees, for example, about 55 degrees. In some embodiments, the angle θ2 is about 20 degrees to 50 degrees, for example, about 35 degrees. In some embodiments, the angle θ3 is about 45 degrees to 85 degrees, for example, about 65 degrees. In some embodiments, the included angle θ4 is about 5 degrees to 40 degrees, for example, about 15 degrees to 30 degrees, for example, about 20 degrees. In some embodiments, the inner diameter of the opening O2 is about 10 to 10,000 times, for example about 100 to 1,000 times, or for example about 400 to 800 times, the width of the prism structure 144 along the x-direction. In other embodiments, the light guide film 140 may also have other structures.

[0106] In some embodiments, the display device 10 further includes a brightness enhancement film 150, which enables the reuse of polarized light, thereby improving light utilization and brightness. For example, the brightness enhancement film 150 includes a reflective polarizer, where light emitted from the light source can be decomposed into P-polarized light and S-polarized light with orthogonal polarization directions. The brightness enhancement film 150 can reflect the S-polarized light before it is absorbed. Through repeated reflection, the brightness enhancement film 150 can reuse approximately 30% to 50% of the S-polarized light, thereby improving light utilization efficiency. In some embodiments, the brightness enhancement film 150 may be disposed between the collimation film 116 of the backlight module 110 and the display panel 120. In some embodiments, the brightness enhancement film 150 may be disposed between the backlight module 110 and the viewing angle control film 130, but is not limited thereto.

[0107] Please refer to Figure 1 When the light-emitting element 112 in the backlight module 110 is turned on and the light-emitting element 113 is turned off, the emitted light R112 of the light-emitting element 112 will first pass through the opening O1 of the viewing angle control film 130 and then through the light guide film 140. Therefore, only the light guide film 140 can adjust the direction of travel of the emitted light R112 of the light-emitting element 112, for example, deflect it to a direction that deviates from the front viewing angle and becomes the emitted light R112'. In this way, the light guide film 140 can shift the light pattern, so that the display device 10 can provide a wide viewing angle display sharing mode. And since the viewing angle control film 130 is provided with an opening O1 corresponding to the light-emitting element 112, the brightness of the light-emitting element 112 can be prevented from being reduced due to passing through the viewing angle control film 130, so as to meet the brightness specifications of the sharing mode.

[0108] Please refer to Figure 1 and Figure 2 In some embodiments, the emitted light brightness of the light-emitting element 112 in column C11 can be controlled to be lower than that of the light-emitting element 112 in column C21 during a certain period of time or several periods of time. In this way, the area of ​​the corresponding column C21 of the display device 10 can have improved contrast and dynamic range, enabling the display device 10 to provide local dimming performance in sharing mode.

[0109] In addition, when the light-emitting element 112 in the backlight module 110 is turned off and the light-emitting element 113 is turned on, the emitted light R113 of the light-emitting element 113 will first pass through the viewing angle control film 130 and then through the opening O2 of the light guide film 140. Therefore, only the viewing angle control film 130 can adjust the direction of travel of the emitted light R113 of the light-emitting element 113, for example, deflect it to the front viewing angle direction to become the emitted light R113'. In this way, the display device 10 can provide a privacy mode with a narrow viewing angle (e.g., only the front viewing angle). Since the light guide film 140 is provided with an opening O2 corresponding to the light-emitting element 113, the brightness of the light-emitting element 113 can be prevented from being reduced by the light guide film 140, so as to meet the brightness specifications of the privacy mode.

[0110] In some embodiments, during a certain period of time, the emitted light brightness of the light-emitting element 113 in column C12 can be controlled to be lower than that of the light-emitting element 113 in column C22. This results in an improved dynamic contrast for the corresponding area of ​​column C22 of the display device 10, enabling the display device 10 to provide local dimming performance in privacy mode. In some embodiments, at a certain point in time or during a certain period of time, a partial privacy scenario can be achieved by turning on only the light-emitting elements 113 in columns C12 and C22 and turning off the remaining light-emitting elements 113.

[0111] The following uses Figures 5 to 16B Further embodiments of the present invention will be described, and the following will be used... Figures 1 to 4B The component designations and related content of the embodiments are described below, wherein the same or similar designations are used to represent the same or similar components, and descriptions of identical technical content are omitted. For explanations of the omitted parts, please refer to... Figures 1 to 4B The embodiments are not described in detail below.

[0112] Figure 5 This is a schematic cross-sectional view of a display device 10-1 according to an embodiment of the present invention. Please refer to... Figure 5 The display device 10-1 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, and a brightness enhancement film 150. (The last sentence appears to be incomplete and possibly refers to a different device.) Figure 1 Compared to the structure of the display device 10 shown, Figure 5 The main difference in the structure of the display device 10-1 shown is that the brightness enhancement film 150 of the display device 10-1 is located between the viewing angle control film 130 and the light guide film 140.

[0113] Figure 6 This is a schematic cross-sectional view of a display device 10-2 according to an embodiment of the present invention. Please refer to... Figure 6, the display device 10-2 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, and a brightness enhancement film 150. Compared with the structure of the display device 10 as shown in Figure 1 shown, Figure 6 the main difference in the structure of the display device 10-2 as shown in

[0114] Figure 7 is a schematic cross-sectional view of a display device 20 according to an embodiment of the present invention. Please refer to Figure 7 , the display device 20 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, and a brightness enhancement film 150. Compared with the structure of the display device 10 as shown in Figure 1 shown, Figure 7 the main difference in the structure of the display device 20 as shown in

[0115] Figure 8 is a schematic cross-sectional view of a display device 20-1 according to an embodiment of the present invention. Please refer to Figure 8 , the display device 20-1 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, and a brightness enhancement film 150. Compared with the structure of the display device 10-1 as shown in Figure 5 shown, Figure 8 the main difference in the structure of the display device 20-1 as shown in

[0116] Figure 9 is a schematic cross-sectional view of a display device 20-2 according to an embodiment of the present invention. Please refer to Figure 9 , the display device 20-2 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, and a brightness enhancement film 150. Compared with the structure of the display device 10-2 as shown in Figure 6 shown, Figure 9 the main difference in the structure of the display device 20-2 as shown in

[0117] Figure 10is a schematic cross-sectional view of a display device 30 according to an embodiment of the present invention. Please refer to Figure 10 , the display device 30 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, and a brightness enhancement film 150. Compared with the structure of the display device 10 as Figure 1 shown, Figure 10 the main difference in the structure of the display device 30 shown is that: the display device 30 further includes a collimating film 305, and the collimating film 305 may be located between the collimating film 116 of the backlight module 110 and the viewing angle control film 130. In some embodiments, the collimating film 305 may be located between the collimating film 116 and the brightness enhancement film 150, but not limited thereto. In some embodiments, the collimating film 305 provides the function of collecting light in the left and right directions, such that the light pattern after light collection has a vertical elliptical profile, that is, the long axis of the elliptical profile is substantially in the vertical direction, but not limited thereto. In some embodiments, the light collection direction of the collimating film 305 is different from that of the collimating film 116. For example, the light collection direction of the collimating film 305 is orthogonal to the light collection direction of the collimating film 116. In some embodiments, the collimating film 305 provides the function of collecting light in the up and down directions, and the collimating film 116 provides the function of collecting light in the left and right directions, so as to provide an extremely collimated effect for the anti-peeking mode.

[0118] Figure 11 is a schematic cross-sectional view of a display device 30-1 according to an embodiment of the present invention. Please refer to Figure 11 , the display device 30-1 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, a brightness enhancement film 150, and a collimating film 305'. Compared with the collimating film 305 of the display device 30 as Figure 10 shown, Figure 11 the main difference in the collimating film 305' of the display device 30-1 shown is that: the collimating film 305' of the display device 30-1 has a plurality of openings O3, and the plurality of openings O3 respectively overlap a plurality of openings O1 of the viewing angle control film 130. In some embodiments, the plurality of openings O3 respectively overlap a plurality of light-emitting elements 112 of the backlight module 110.

[0119] For example, when the display device 30-1 is in the anti-peeking mode with the light-emitting element 112 turned off and the light-emitting element 113 turned on, the light from the light-emitting element 113 can be collected in the up and down directions through, for example, the collimating film 116 and collected in the left and right directions through the collimating film 305', so as to improve the light transmittance and brightness in the forward viewing angle. For example, through simulation, it can be known that in the anti-peeking mode, the light transmittance in the direction deviated 30 degrees from the forward viewing angle direction may be less than 0.5% of the light transmittance in the forward viewing angle direction in the Sharing mode, for example, about 0.48%.

[0120] In addition, when the display device 30-1 is in the sharing mode with the light-emitting element 112 turned on and the light-emitting element 113 turned off, the light from the light-emitting element 112 is only collected vertically and horizontally through the collimating film 116 and passes through the opening O3 of the collimating film 305' without being affected by the collimating film 305'. Therefore, the large-angle brightness loss in the sharing mode can be reduced, and the transmittance and brightness of the large-angle light in the horizontal direction can be improved. For example, through simulation, it can be known that the light transmittance in the direction deviated 40 degrees from the forward viewing direction in the horizontal direction can be 70% to 90% of the light transmittance in the forward viewing direction, such as about 80%.

[0121] Figure 12 is a schematic cross-sectional view of a display device 40 according to an embodiment of the present invention. Please refer to Figure 12 , the display device 40 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, and a brightness enhancement film 150. Compared with the structure of the display device 10 as shown in Figure 1 , the main difference in the structure of the display device 40 as shown in Figure 12 is that the display device 40 further includes a viewing angle control film 405, and the viewing angle control film 405 can be located between the light guide film 140 and the display panel 120, between the viewing angle control film 130 and the display panel 120, and between the brightness enhancement film 150 and the display panel 120. In some embodiments, the viewing angle control film 405 has a similar structure to the viewing angle control film 130 as shown in Figure 4A , but the extending direction of the light blocking structure of the viewing angle control film 405 can intersect with the extending direction of the light blocking structure 132 of the viewing angle control film 130. For example, the included angle between the extending direction of the light blocking structure of the viewing angle control film 405 and the extending direction of the light blocking structure 132 of the viewing angle control film 130 can be between about 80 degrees and 100 degrees (for example, 90 degrees). In some embodiments, the viewing angle control film 405 can provide the function of preventing peeping from above and below, thereby avoiding problems such as the windshield blocking the viewing angle.

[0122] In addition, although not shown, the viewing angle control film 405 can also be disposed between the display panel 120 and the one closest to the display panel 120 among the viewing angle control film 130, the light guide film 140, and the brightness enhancement film 150 of the display devices 10-1, 10-2, 20, 20-1, 20-2, 30 as shown in Figures 5 to 10 . For example, in Figure 5 and Figure 10 , the viewing angle control film 405 can be disposed between the light guide film 140 and the display panel 120; in Figure 6 and Figure 9 , the viewing angle control film 405 can be disposed between the brightness enhancement film 150 and the display panel 120; in Figure 7 and Figure 8In this case, the viewing angle control film 405 can be disposed between the viewing angle control film 130 and the display panel 120.

[0123] Figure 13 It is a schematic cross-sectional view of a display device 40-1 according to an embodiment of the present invention. Please refer to Figure 13 , the display device 40-1 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, a brightness enhancement film 150, and a collimating film 305'. Compared with the structure of the display device 30-1 as Figure 11 shown, Figure 13 The difference in the structure of the display device 40-1 shown is mainly that: the display device 40-1 further includes a viewing angle control film 405, and the viewing angle control film 405 can be located between the light guide film 140 and the display panel 120, between the viewing angle control film 130 and the display panel 120, and between the brightness enhancement film 150 and the display panel 120, so as to avoid problems such as a windshield blocking the viewing angle.

[0124] Figure 14 It is a schematic cross-sectional view of a display device 40-2 according to an embodiment of the present invention. Please refer to Figure 14 , the display device 40-2 may include a backlight module 110, a display panel 120, a viewing angle control film 130, a light guide film 140, a brightness enhancement film 150, a collimating film 305', and a viewing angle control film 405'. Compared with the viewing angle control film 405 of the display device 40-1 as Figure 13 shown, Figure 14 The difference in the viewing angle control film 405' of the display device 40-2 shown is mainly that: the viewing angle control film 405' of the display device 40-2 has a plurality of openings O4, and the plurality of openings O4 respectively overlap a plurality of openings O2 of the light guide film 140. In some embodiments, the plurality of openings O4 respectively overlap a plurality of light-emitting elements 113 of the backlight module 110. Additionally, although not shown, the viewing angle control film 405' can also be disposed between the display panel 120 and the one closest to the display panel 120 among the viewing angle control film 130, the light guide film 140, and the brightness enhancement film 150 of the display devices 10-1, 10-2, 20, 20-1, 20-2, 30 as Figures 5 to 10 shown.

[0125] The openings O1 of the viewing angle control film 130, the openings O2 of the light guide film 140, the openings O3 of the collimating film 305', and the openings O4 of the viewing angle control film 405' can be formed by a laser process or a punch process, and the openings O1~O4 mainly remove the functional structures of the respective films. For example, please refer to Figure 4BSince the functional structure of the light guide film 140 is the prism structure 144, the opening O2 only needs to remove the prism structure 144 of the light guide film 140. However, the base plate 142 is not the functional structure of the light guide film 140, so the opening O2 does not need to remove the base plate 142.

[0126] When the size of the light-emitting elements 112 and 113 is approximately 0.1 μm to 100 μm, the size of the openings O1 to O4 can be approximately 1 μm to 500 μm. In this case, a laser process can be used to form the openings O1 to O4. Alternatively, when the size of the light-emitting elements 112 and 113 is approximately 100 μm to 1,000 μm, the size of the openings O1 to O4 can be approximately 500 μm to 5,000 μm. In this case, a die-cutting process can be used to form the openings O1 to O4.

[0127] Figure 15A This is a schematic cross-sectional view of a display device 50 according to an embodiment of the present invention. Figure 15B This is a schematic top view of the backlight module 510 of a display device 50 according to an embodiment of the present invention. Figure 15C This is a schematic cross-sectional view of the light guide film 540 of a display device 50 according to an embodiment of the present invention.

[0128] Please refer to Figure 15A The display device 50 may have a display area A1 and a display area A2. Display area A1 and display area A2 may be adjacent, but are not limited thereto. The display device 50 may be an automotive display device; for example, the display device 50 may be mounted on the vehicle body, such as on the dashboard, windshield, window, sunroof, or in a suitable location around the driver's seat. In some embodiments, display area A1 of the display device 50 may be located in the passenger side area of ​​the vehicle, and display area A2 may be located in the driver's side area of ​​the vehicle, wherein display area A1 may provide a function of shielding the driver's view (i.e., driver's side privacy protection) as needed.

[0129] The display device 50 may include a backlight module 510, a display panel 120, a viewing angle control film 530, a light guide film 540, and a brightness enhancement film 150. The display panel 120 and the brightness enhancement film 150 of the display device 50 are as follows: Figure 1 The display panel 120 and brightness enhancement film 150 of the display device 10 shown are substantially the same, and the substrate 111, reflective sheet 114, diffuser 115 and collimating film 116 of the backlight module 510 can be used with... Figure 1 The substrate 111, reflector 114, diffuser 115, and collimating film 116 of the display device 10 shown are substantially the same. Furthermore, the viewing angle control film 530 and the light guide film 540 of the display device 50 have the same structure in the display area A1 as shown. Figure 1 The structures of the viewing angle control film 130 and the light guide film 140 of the display device 10 shown can be substantially the same.

[0130] Please refer to Figure 15A and Figure 15B In some embodiments, in addition to the plurality of light-emitting elements 112, 113 located in display area A1, the backlight module 510 also includes a plurality of light-emitting elements 512 located in display area A2. The plurality of light-emitting elements 512 can be arranged in an array. For example, the plurality of light-emitting elements 512 can be arranged in a manner similar to that of the plurality of light-emitting elements 112 and / or the plurality of light-emitting elements 113. In some embodiments, the distribution density of the plurality of light-emitting elements 512 is equal to the distribution density of the plurality of light-emitting elements 112 or the distribution density of the plurality of light-emitting elements 113.

[0131] In some embodiments, the light-emitting element 512 may have the same or different structure as the light-emitting element 112 or the light-emitting element 113. In some embodiments, the light-emitting element 512 is, for example, a miniature light-emitting diode (μLED), but is not limited thereto. The light-emitting element 512 may have the same or different emission wavelength range as the light-emitting element 112 or the light-emitting element 113. In some embodiments, the emission wavelength range of the light-emitting element 512 is exactly the same or substantially the same as the emission wavelength range of the light-emitting element 112 or the light-emitting element 113.

[0132] Please refer to Figure 15A In some embodiments, the viewing angle control film 530 of the display device 50 has multiple openings O1, and the viewing angle control film 530 is completely located in the display area A1. That is, the viewing angle control film 530 is only disposed in the display area A1, and the viewing angle control film 530 does not exist in the display area A2. Therefore, the multiple openings O1 of the viewing angle control film 530 are all located in the display area A1, and the multiple openings O1 can respectively overlap the multiple light-emitting elements 112 of the backlight module 510.

[0133] Please refer to Figure 15A and Figure 15C The light guide film 540 may have multiple openings O2, which may overlap with multiple light-emitting elements 113 of the backlight module 510, and all openings O2 are located in the display area A1. In some embodiments, the prism structure 542 of the light guide film 540 located in the display area A1 has a apex angle θ1', a bottom angle θ5, and a bottom angle θ6, wherein the bottom angle θ5 is greater than the bottom angle θ6, and the prism structure 544 of the light guide film 540 located in the display area A2 has a apex angle θ1', a bottom angle θ7, and a bottom angle θ8, wherein the bottom angle θ7 is smaller than the bottom angle θ8. For example, the prism structures 542 and 544 are symmetrical about the boundary BD between the display areas A1 and A2. In some embodiments, the apex angle θ1' of the prism structures 542 and 544 is approximately 45 degrees to 70 degrees. In other embodiments, the apex angles of the prism structures 542 and 544 may be different.

[0134] Figure 16A This is a schematic cross-sectional view of a display device 60 according to an embodiment of the present invention. Figure 16B This is a schematic top view of the backlight module 610 of a display device 60 according to an embodiment of the present invention. Please refer to... Figure 16A and Figure 16B The display device 60 may include a backlight module 610, a display panel 120, a viewing angle control film 630, a light guide film 640, and a brightness enhancement film 150. The display panel 120 and the brightness enhancement film 150 of the display device 60 are as follows: Figure 1 The display panel 120 and brightness enhancement film 150 of the display device 10 shown are substantially the same, and the substrate 111, reflective sheet 114, diffuser 115 and collimating film 116 of the backlight module 610 can be used with... Figure 1 The substrate 111, reflector 114, diffuser 115, and collimating film 116 of the display device 10 shown are substantially the same. Furthermore, the viewing angle control film 630 and the light guide film 640 of the display device 60 have the same structure in the display area A1 as shown. Figure 1 The structures of the viewing angle control film 130 and the light guide film 140 of the display device 10 shown can be substantially the same.

[0135] In some embodiments, in addition to the plurality of light-emitting elements 112, 113 located in display area A1, the backlight module 610 also includes a plurality of light-emitting elements 612 located in display area A2. The plurality of light-emitting elements 612 can be arranged in an array; for example, the plurality of light-emitting elements 612 can be arranged in a manner similar to that of the plurality of light-emitting elements 112 and / or the plurality of light-emitting elements 113. In some embodiments, the distribution density of the plurality of light-emitting elements 612 is greater than the distribution density of the plurality of light-emitting elements 112 or the distribution density of the plurality of light-emitting elements 113. For example, the distribution density of the plurality of light-emitting elements 612 is equal to the distribution density of the plurality of light-emitting elements 112 and the plurality of light-emitting elements 113.

[0136] In some embodiments, the light-emitting element 612 may have the same or different structure as the light-emitting element 112 or the light-emitting element 113. In some embodiments, the light-emitting element 612 is, for example, a miniature light-emitting diode (μLED), but is not limited thereto. The light-emitting element 612 may have the same or different emission wavelength range as the light-emitting element 112 or the light-emitting element 113. In some embodiments, the emission wavelength range of the light-emitting element 612 is exactly the same or substantially the same as the emission wavelength range of the light-emitting element 112 or the light-emitting element 113.

[0137] Please refer to Figure 16AIn some embodiments, the viewing angle control film 630 of the display device 60 may have multiple openings O1, which may overlap with multiple light-emitting elements 112 of the backlight module 610, and all openings O1 are located in the display area A1. In some embodiments, the light guide film 640 of the display device 60 has multiple openings O2, and the light guide film 640 is completely located in the display area A1. That is, the light guide film 640 is only disposed in the display area A1 and does not exist in the display area A2. Therefore, all openings O2 of the light guide film 640 are located in the display area A1, and the multiple openings O2 may overlap with multiple light-emitting elements 113 of the backlight module 610.

[0138] In summary, the privacy display device of the present invention, by using dedicated light-emitting elements in both sharing and privacy modes, can achieve the same brightness specifications for both modes, and provides local dimming functionality for each mode. Furthermore, in privacy mode, the privacy display device of the present invention can also achieve zoned privacy by illuminating light-emitting elements in specific areas.

[0139] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A privacy display device, characterized in that, include: The backlight module includes multiple light-emitting elements; Display panel, overlapping the backlight module; A first viewing angle control film is located between the display panel and the backlight module and has a plurality of first openings, wherein the plurality of first openings respectively overlap a plurality of first light-emitting elements among the plurality of light-emitting elements; as well as A light guide film is located between the display panel and the backlight module and has a plurality of second openings, wherein the plurality of second openings overlap a plurality of the plurality of second light-emitting elements.

2. The privacy display device as described in claim 1, characterized in that, The plurality of first light-emitting element arrays are arranged in a plurality of main columns, wherein the plurality of first light-emitting elements in each of the main columns are arranged along a first direction, and the plurality of second light-emitting element arrays are arranged in a plurality of sub-columns, wherein the plurality of second light-emitting elements in each of the sub-columns are arranged along the first direction, and the plurality of main columns and the plurality of sub-columns are alternately arranged along a second direction intersecting the first direction.

3. The privacy display device as described in claim 1, characterized in that, The light guide film is located between the first viewing angle control film and the display panel or between the first viewing angle control film and the backlight module.

4. The privacy display device as described in claim 1, characterized in that, The backlight module further includes a reflective sheet located on the side of the plurality of light-emitting elements opposite to the display panel.

5. The privacy display device as described in claim 1, characterized in that, It also includes a brightness enhancement film located between the backlight module and the display panel.

6. The privacy display device as described in claim 1, characterized in that, The backlight module further includes a diffuser sheet located between the plurality of light-emitting elements and the first viewing angle control film, and between the plurality of light-emitting elements and the light guide film.

7. The privacy display device as described in claim 6, characterized in that, The backlight module further includes a first collimating film, which is located between the diffuser and the first viewing angle control film, and between the diffuser and the light guide film.

8. The privacy display device as described in claim 7, characterized in that, It also includes a second collimating film, located between the first collimating film and the first viewing angle control film, and between the first collimating film and the light guide film.

9. The privacy display device as described in claim 8, characterized in that, The second collimating film has a plurality of third openings, and the plurality of third openings overlap the plurality of first light-emitting elements respectively.

10. The privacy display device as claimed in claim 1, characterized in that, It also includes a second viewing angle control film, located between the light guide film and the display panel, and between the first viewing angle control film and the display panel.

11. The privacy display device as claimed in claim 10, characterized in that, The second viewing angle control film has a plurality of fourth openings, and the plurality of fourth openings overlap the plurality of second light-emitting elements respectively.

12. The privacy display device as claimed in claim 1, characterized in that, The plurality of first light-emitting elements and the plurality of second light-emitting elements are located in the first display area of ​​the privacy display device, and the plurality of third light-emitting elements are located in the second display area of ​​the privacy display device, and the distribution density of the plurality of third light-emitting elements is equal to or greater than the distribution density of the plurality of first light-emitting elements or the plurality of second light-emitting elements.

13. The privacy display device as described in claim 12, characterized in that, The light guide film is located entirely within the first display area.

14. The privacy display device as described in claim 12, characterized in that, The first viewing angle control film is located entirely within the first display area.

15. The privacy display device as claimed in claim 14, characterized in that, The surface of the light guide film has multiple prism structures, each of which has a first base angle and a second base angle, and the first base angle is not equal to the second base angle.

16. The privacy display device as claimed in claim 15, characterized in that, In the plurality of prism structures, the first base angle of the first prism structure located in the first display area is greater than the second base angle, and the first base angle of the second prism structure located in the second display area is smaller than the second base angle.

17. A vehicle privacy display device, characterized in that, include: The backlight module is located on the vehicle body and includes multiple light-emitting elements; Display panel, overlapping the backlight module; A first viewing angle control film is located between the display panel and the backlight module and has a plurality of first openings, wherein the plurality of first openings respectively overlap a plurality of first light-emitting elements among the plurality of light-emitting elements; as well as A light guide film is located between the display panel and the backlight module and has a plurality of second openings, wherein the plurality of second openings overlap a plurality of the plurality of second light-emitting elements.

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