Privacy display device

Abstract

The application discloses a kind of privacy display devices, including collimating backlight module (1) and liquid crystal display panel (2) of laminated arrangement, liquid crystal display panel (2) is located in the light side of collimating backlight module (1).Wherein, liquid crystal display panel (2) includes array substrate (21) and opposite substrate (22) of relative arrangement, array substrate (21) is close to collimating backlight module (1), opposite substrate (22) is away from collimating backlight module (1).Opposite substrate (22) includes: substrate (221), substrate (221) has multiple light-transmitting regions (AA) and non-light-transmitting region (BB) between adjacent light-transmitting regions (AA) and reflection layer (222), located on substrate (221), and the orthographic projection of reflection layer (222) on substrate (221) and the orthographic projection of at least part non-light-transmitting region (BB) on substrate (221) are mutually overlapped, and reflection layer (222) is configured to reflect ambient light.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and in particular to a privacy display device. Background Technology

[0002] With the rapid development of display technology, its display range and application scenarios are constantly expanding. Privacy displays have emerged as a result, providing viewers with a sufficiently private viewing experience and greatly enhancing their privacy display effect in specialized display fields. Summary of the Invention

[0003] This disclosure provides a privacy display device, including a collimated backlight module and a liquid crystal display panel stacked together, wherein the liquid crystal display panel is located on the light-emitting side of the collimated backlight module; wherein...

[0004] The liquid crystal display panel includes an array substrate and a counter substrate disposed opposite to each other. The array substrate is closer to the collimating backlight module, and the counter substrate is farther away from the collimating backlight module.

[0005] The opposing substrate includes:

[0006] A substrate having a plurality of light-transmitting regions and a non-light-transmitting region located between adjacent light-transmitting regions;

[0007] A reflective layer is located on the substrate, and the orthographic projection of the reflective layer on the substrate overlaps with the orthographic projection of at least a portion of the non-transparent region on the substrate, the reflective layer being configured to reflect ambient light.

[0008] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the orthogonal projection of the reflective layer on the substrate completely overlaps with the orthogonal projection of the non-transparent area on the substrate.

[0009] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the reflective layer is located on the side of the substrate facing the array substrate, and the opposing substrate further includes a black matrix layer located on the side of the reflective layer facing the array substrate, the black matrix layer defining the light-transmitting area and the non-light-transmitting area.

[0010] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the pattern of the reflective layer and the pattern of the black matrix layer are the same.

[0011] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the reflective layer is located on the side of the substrate facing the array substrate, and the opposing substrate further includes a black matrix layer located on the side of the reflective layer facing the array substrate, the black matrix layer defining the light-transmitting area and the non-light-transmitting area; the reflective layer is reused as the black matrix layer.

[0012] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the material of the reflective layer is metal.

[0013] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the reflective layer is grounded.

[0014] In one possible implementation, the privacy display device provided in the embodiments of this disclosure further includes a liquid crystal polymer structure located between the collimated backlight module and the liquid crystal display panel; the liquid crystal polymer structure includes: a first substrate and a second substrate disposed opposite to each other, a liquid crystal polymer layer located between the first substrate and the second substrate, a first electrode located between the first substrate and the liquid crystal polymer layer, and a second electrode layer located between the second substrate and the liquid crystal polymer layer.

[0015] The liquid crystal polymer structure is configured to control the refractive index of the liquid crystal polymer layer by an electric field applied between the first electrode layer and the second electrode layer, so that the liquid crystal polymer layer switches between a transparent state and an opaque state.

[0016] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the collimated backlight module includes a side-lit light source and a dimming structure, wherein the side-lit light source is located on the light-incident side of the dimming structure; the side-lit light source is configured to provide incident light to the dimming structure; and the dimming structure is configured to adjust the exit direction of the incident light so that collimated light rays are emitted from the light-out side of the dimming structure.

[0017] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the dimming structure includes a reflective sheet and a light guide plate stacked together. The light guide plate has a light-emitting surface and a bottom surface disposed opposite to each other. The bottom surface of the light guide plate has a plurality of dimming microstructures. The reflective sheet is located on the bottom surface of the light guide plate. The incident light is configured to be incident from the side of the light guide plate.

[0018] The dimming structure further includes: a reverse prism sheet located on the side of the light guide plate opposite to the reflective sheet, and a privacy film located on the side of the reverse prism sheet opposite to the reflective sheet.

[0019] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the opposing substrate further includes a color resist layer located on the side of the black matrix layer opposite to the substrate, a planarization layer located on the side of the color resist layer opposite to the substrate, and a spacer layer located on the side of the planarization layer opposite to the substrate; wherein, the color resist layer includes a plurality of color resists, and the color resists are located in the light-transmitting area.

[0020] In one possible implementation, in the privacy display device provided in the embodiments of this disclosure, the liquid crystal display panel further includes: a liquid crystal layer located between the array substrate and the opposing substrate, a first polarizer located on the side of the array substrate facing away from the opposing substrate, and a second polarizer located on the side of the opposing substrate facing away from the array substrate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a privacy display device provided in an embodiment of the present disclosure;

[0022] Figure 2 This is a schematic diagram of the structure of another privacy display device provided in an embodiment of the present disclosure;

[0023] Figure 3 for Figure 1 Top view of the black matrix layer and the color resist layer;

[0024] Figure 4 This is a schematic diagram of the structure of another privacy display device provided in an embodiment of the present disclosure;

[0025] Figure 5 This is a schematic diagram of the structure of another privacy display device provided in an embodiment of the present disclosure;

[0026] Figure 6 This is a schematic diagram of the structure of another privacy display device provided in an embodiment of the present disclosure;

[0027] Figure 7 This is a schematic diagram of the structure of another privacy display device provided in an embodiment of the present disclosure;

[0028] Figure 8 To increase the contrast before and after the reflective layer, the contrast curve of CR as a function of viewing angle is shown.

[0029] Figure 9 for Figure 8 A magnified view of a portion of the image;

[0030] Figure 10A The effect of adding a white screen privacy display for the left-side view before and after the reflective layer;

[0031] Figure 10BThe effect of adding a white screen privacy display corresponding to the positive viewing angle before and after the reflective layer;

[0032] Figure 10C The effect of adding a white screen privacy display corresponding to the right-side view before and after the reflective layer;

[0033] Figure 11 The image shows the privacy display effect of adding a reflective layer to the black and white text before and after the image. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Furthermore, the embodiments and features in the embodiments of this disclosure can be combined with each other without conflict. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0035] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms as used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "inner," "outer," "upper," and "lower" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0036] It should be noted that the dimensions and shapes of the figures in the accompanying drawings do not reflect actual scale and are intended only to illustrate the content of this disclosure. Furthermore, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout.

[0037] Currently, information leakage prevention is applied to various display products, such as bank ATMs, high-end privacy laptops, monitor displays, and automotive displays. Existing privacy display products mostly achieve privacy through collimated backlight systems (backlight systems with low brightness at side viewing angles), such as privacy films, CML (Collimate Micro-Structure LGP) backlights, or by adding a liquid crystal cell structure to the backlight to filter light from wide viewing angles. However, because collimated backlight systems cannot achieve perfect black at side viewing angles, and the brightness decreases gradually from high to low at the front viewing angle, the effective emitted light from the display product can still be seen at the side viewing angle, thus allowing the identification of confidential information. Therefore, such privacy display products still pose a risk of information leakage.

[0038] To address the risk of information leakage still present in privacy display products in related technologies, this disclosure provides a privacy display device, such as... Figure 1 and Figure 2 As shown, the system includes a collimated backlight module 1 and a liquid crystal display panel 2 stacked together, with the liquid crystal display panel 2 located on the light-emitting side of the collimated backlight module 1; wherein,

[0039] The liquid crystal display panel 2 includes an array substrate 21 and a counter substrate 22 disposed opposite to each other. The array substrate 21 is closer to the collimating backlight module 1, and the counter substrate 22 is farther away from the collimating backlight module 1.

[0040] The opposing substrate 22 includes:

[0041] The substrate 221 has multiple light-transmitting regions AA and non-light-transmitting regions BB located between adjacent light-transmitting regions AA.

[0042] A reflective layer 222 is located on a substrate 221, and the orthographic projection of the reflective layer 222 on the substrate 221 overlaps with the orthographic projection of at least a portion of the non-transparent region BB on the substrate 221. The reflective layer 222 is configured to reflect ambient light.

[0043] The privacy display device provided in this embodiment achieves privacy display functionality by using a liquid crystal display panel paired with a collimated backlight module. Furthermore, by adding a reflective layer within the opposing substrate, and ensuring that the orthographic projection of the reflective layer on the substrate overlaps with the orthographic projection of at least a portion of the non-transparent area on the substrate, the added reflective layer does not affect normal display. The reflective layer is configured to reflect ambient light, ensuring that the reflected ambient light enters the human eye with consistent intensity at both the frontal and side viewing angles. Due to the collimated backlight module, the display panel's own luminance is lower at the side viewing angle and higher at the frontal viewing angle. Thus, at the frontal viewing angle, the reflected ambient light brightness is far lower than the brightness of the light emitted by the display panel itself, not affecting normal display. At the side viewing angle, the reflected ambient light brightness is greater than the brightness of the light emitted by the display panel itself, resulting in a lower proportion of the effective emitted light brightness to the total light intensity seen by the human eye, making it difficult for the human eye to clearly see the displayed content at the side viewing angle. Therefore, this embodiment improves the privacy display effect by using a collimated backlight module to achieve privacy display functionality.

[0044] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the orthographic projection of the reflective layer 222 onto the substrate 221 completely overlaps with the orthographic projection of the non-transparent area BB onto the substrate 221. Thus, from a side viewing angle, the brightness of the reflected ambient light is much greater than the brightness of the light emitted by the display panel itself, further reducing the proportion of the effective emitted light brightness of the display panel to the total light brightness seen by the human eye, thereby further improving the privacy protection effect.

[0045] In practical implementation, since display panels generally have multiple colored light-transmitting areas, in order to prevent crosstalk between adjacent light-transmitting areas, the privacy display device provided in this embodiment of the present disclosure, such as... Figure 1 As shown, the reflective layer 222 is located on the side of the substrate 221 facing the array substrate 21. The opposing substrate 22 also includes a black matrix layer 223 located on the side of the reflective layer 222 facing the array substrate 21. The black matrix layer 223 defines a light-transmitting region AA and a non-light-transmitting region BB.

[0046] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 1 As shown, the pattern of the reflective layer 222 is the same as that of the black matrix layer 223. Specifically, as shown... Figure 3 As shown, Figure 3 for Figure 1The diagram shows a top view of the black matrix layer 223 and the color resist layer 224 (described later). The pattern of the reflective layer 222 (not shown) is the same as that of the black matrix layer 223. The main function of the added reflective layer 222 is to reflect ambient light into the human eye. From a side viewing angle, since the liquid crystal display panel 2 itself has low brightness, the reflected light from the ambient light entering the human eye through the reflective layer 222 significantly reduces the effective brightness ratio of the liquid crystal display panel 2. Furthermore, the contrast ratio (CR, the ratio of the brightness of the liquid crystal display panel 2 itself to the brightness of the total light) is greatly reduced from a side viewing angle due to the influence of ambient light, making it more difficult for the human eye to recognize the displayed content. Therefore, the added reflective layer 222 does not affect the normal display and transmittance of the liquid crystal display panel 2, thus achieving a further privacy protection effect without affecting normal display and transmittance.

[0047] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 2 As shown, the reflective layer 222 is located on the side of the substrate 221 facing the array substrate 21. The opposing substrate 22 also includes a black matrix layer 223 located on the side of the reflective layer 222 facing the array substrate 21. The black matrix layer 223 defines a light-transmitting region AA and a non-light-transmitting region BB. The reflective layer 222 can be reused as the black matrix layer 223. This reduces the fabrication process of the black matrix layer, thereby reducing the fabrication process and cost.

[0048] It should be noted that the embodiment disclosed herein takes the reflective layer 222 located on the side of the substrate 221 facing the array substrate 21 as an example. Of course, the reflective layer 222 can also be located on the side of the substrate 221 facing away from the array substrate 21.

[0049] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 1 and Figure 2 As shown, the material of the reflective layer 222 can be a metal. Specifically, the metal can be a material with high reflectivity, such as aluminum or silver, but it is not limited to these.

[0050] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 4 and Figure 5 As shown, the reflective layer 222 can be grounded. In this way, the reflective layer 222 can also serve as an electrostatic shield, thereby reducing the need for a separate shielding layer, further simplifying the manufacturing process and lowering costs.

[0051] like Figure 1 , Figure 2 , Figure 4 and Figure 5As shown, for a conventional privacy display device, the effective emitted light from the liquid crystal display panel 2 at the frontal and side viewing angles is represented by solid arrows L1, where the length of arrow L1 represents the intensity of the light at the frontal and side viewing angles. It can be seen that for a conventional privacy display device, the light at the side viewing angle is much less bright than the light at the frontal viewing angle. To prevent information leakage due to light leakage at low brightness during side viewing, this disclosure adds a reflective layer 222 with the same pattern as the black matrix layer 223 between the substrate 221 and the black matrix layer 223 of the opposing substrate 22, or directly uses the reflective layer 222 to replace the black matrix layer 223. The ambient light reflected by the reflective layer 222 is shown as the dashed arrow L2. The brightness of the reflected ambient light is consistent at both the front and side viewing angles. At the front viewing angle, the brightness of the reflected ambient light is much lower than the brightness of the light emitted by the liquid crystal display panel 2 itself, so the added reflective layer 222 does not affect normal display. At the side viewing angle, the brightness of the reflected ambient light is greater than the brightness of the light emitted by the liquid crystal display panel 2 itself. At the side viewing angle, the proportion of the effective emitted light of the liquid crystal display panel 2 in the total light seen by the human eye is low, and the human eye cannot clearly see the displayed content at the side viewing angle. Therefore, the embodiments of this disclosure can improve the privacy protection effect.

[0052] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 6 and Figure 7 As shown, it also includes a liquid crystal polymer structure 3 located between the collimated backlight module 1 and the liquid crystal display panel 2; the liquid crystal polymer structure 3 includes: a first substrate 31 and a second substrate 32 disposed opposite to each other, a liquid crystal polymer layer 33 located between the first substrate 31 and the second substrate 32, a first electrode 34 located between the first substrate 31 and the liquid crystal polymer layer 33, and a second electrode layer 35 located between the second substrate 32 and the liquid crystal polymer layer 33.

[0053] The liquid crystal polymer structure 3 is configured to control the refractive index of the liquid crystal polymer layer 33 by means of an electric field applied between the first electrode layer 34 and the second electrode layer 35, so that the liquid crystal polymer layer 33 switches between a transparent state and an opaque state.

[0054] Specifically, such as Figure 6 and Figure 7 As shown, the liquid crystal polymer layer 33 has a polymer-dispersed liquid crystal (PDLC) structure, that is, the liquid crystal polymer layer 33 includes a polymer 331 and liquid crystal molecules 332 dispersed within the polymer 331. The polymer 331 may include, but is not limited to, photopolymerizable compounds or mixtures thereof, such as polycyclic aromatic hydrocarbons, fused-ring aromatic hydrocarbons, cyclic polyenes, etc.

[0055] The dielectric constant of liquid crystal molecules 332 differs along their major and minor axes. Typically, the component of the dielectric constant along the major axis of liquid crystal molecules 332 is defined as ε∥, and the component perpendicular to the major axis is defined as ε⊥, with the difference Δε = ε∥ - ε⊥. When Δε > 0, the liquid crystal molecule 332 is electrically termed a positive liquid crystal, and its major axis rotates parallel to the electric field. When Δε < 0, it is termed a negative liquid crystal, and its major axis rotates perpendicular to the electric field. When the electric field strength is sufficiently large, the liquid crystal molecules 332 eventually align parallel or perpendicular to the electric field. This disclosure embodiment... Figure 6 and Figure 7 Taking liquid crystal molecule 332 as an example of negative liquid crystal.

[0056] like Figure 6 As shown, when the first electrode layer 34 and the second electrode layer 35 are not energized, the liquid crystal molecules 332 are vertically and uniformly aligned due to the initial action of the polymer 331 chains. At this time, the refractive index of the liquid crystal molecules 332 matches the refractive index of the polymer 331, the refractive index of the liquid crystal polymer structure 3 is uniform, and the liquid crystal polymer structure 3 is transparent. The light emitted from the collimated backlight module 1 does not scatter after passing through the liquid crystal polymer structure 3, that is, the light emitted from the collimated backlight module 1 does not change its propagation direction when passing through the liquid crystal polymer structure 3, and the collimated light emitted from the collimated backlight module 1 remains collimated and is emitted to the liquid crystal display panel 2. Figure 6 The light from the side view L2 is much less bright than the light from the front view L1, thus achieving the privacy function.

[0057] like Figure 7 As shown, when the first electrode layer 34 and the second electrode layer 35 are energized, the negative liquid crystal molecules 332 deflect horizontally under the action of the vertical electric field. At this time, the liquid crystal molecules 332 in the liquid crystal polymer structure 3 are randomly arranged, and the refractive index of the liquid crystal molecules 332 does not match the refractive index of the polymer 331. The liquid crystal polymer structure 3 is in an opaque state (scattering state). When the collimated light emitted from the collimated backlight module 1 passes through the liquid crystal polymer structure 3, it is scattered, and the collimation is destroyed. The self-luminous brightness of the liquid crystal display panel 2 is relatively high in the side viewing angle direction. At this time, the reflective layer 222 added in the opposing substrate 22 reflects ambient light, but the brightness of the reflected ambient light corresponding to the side viewing angle is much smaller than the self-luminous brightness of the display panel in the side viewing angle direction. The reflected ambient light does not affect the viewing from the side viewing angle. Figure 7 The light rays L2 from the side view and L1 from the front view have roughly the same brightness, therefore Figure 7 The screen content can still be clearly seen from a wide viewing angle, which means that the shared display mode is achieved.

[0058] Therefore, by setting a liquid crystal polymer structure 3 between the collimated backlight module 1 and the liquid crystal display panel 2, the present invention can realize the switching between privacy mode display and shared mode display, and the user can select privacy mode and shared mode according to actual needs.

[0059] Specifically, such as Figure 6 and Figure 7 As shown, the first substrate 31 and the second substrate 32 can be glass substrates or plastic substrates; the materials of the first electrode layer 34 and the second electrode layer 35 can be indium tin oxide, silver nanowires, or graphene, etc. The transmittance of the liquid crystal polymer layer 33 can exhibit a gradual change characteristic with the change of the applied electric field, that is, the liquid crystal polymer structure 3 can also realize the grayscale adjustment function.

[0060] It should be noted that, Figure 6 and Figure 7 The specific structure of the LCD panel 2 is not shown. Figure 6 and Figure 7 The specific structure of the liquid crystal display panel 2 and Figure 1 , Figure 2 , Figure 4 or Figure 5 The specific structure of the LCD display panel 2 is the same. Figure 6 and Figure 7 The structure shown is in Figure 1 , Figure 2 , Figure 4 or Figure 5 An embodiment further adding liquid crystal polymer structure 3 based on the existing one.

[0061] like Figure 8 and Figure 9 As shown, Figure 8 To test the contrast ratio (CR) versus viewing angle before and after adding a reflective layer (222) to the opposing substrate (22) of the liquid crystal display panel (2), Figure 9 for Figure 8 The diagram shows a magnified view of a part of the image. Curve A represents the curve without the added reflective layer 222, and curve B represents the curve with the added reflective layer 222. As can be seen from curves A and B, the addition of the reflective layer 222 significantly improves the brightness in the dark state from the side view due to the interference of ambient light. The CR of the side view is greatly reduced, and the image from the side view is relatively blurry, thus upgrading the privacy protection effect.

[0062] like Figures 10A-10C As shown, Figures 10A-10C The images show the white screen privacy display effect before and after adding a reflective layer 222 to the opposing substrate 22 of the liquid crystal display panel 2, corresponding to the left, front, and right viewing angles. Figures 10A-10C The image within the solid line frame shows the effect of adding reflective layer 222. Figures 10A-10C The image within the dashed box shows the effect without the added reflective layer 222. Figure 10B As can be seen, the presence or absence of reflective layer 222 has no effect on the orthogonal viewing angle. From Figure 10A and Figure 10C As can be seen, for both left and right viewing angles, adding the reflective layer 222 can reduce the brightness ratio of the effective emitted light from the liquid crystal display panel. The liquid crystal display panel with the reflective layer 222 exhibits a reflective effect from the side viewing angle, which can improve the privacy protection effect.

[0063] like Figure 11 As shown, Figure 11 The diagram illustrates the privacy display effect of adding a reflective layer 222 to the opposing substrate 22 of the liquid crystal display panel 2 before and after adding the black and white text image. Figure 11 The image within the solid line frame shows the effect of adding reflective layer 222. Figure 11 The image within the dashed box shows the effect without the added reflective layer 222. From a side view, the text content cannot be recognized in the image with the reflective layer 222, while the text information can still be distinguished in the privacy mode without the reflective layer 222.

[0064] Therefore, the addition of a reflective layer 222 to the liquid crystal display panel 2 can effectively improve the privacy protection effect and upgrade the privacy protection effect.

[0065] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 1 , Figure 2 , Figures 4-7 As shown, the collimated backlight module 1 includes a side-lit light source 11 and a dimming structure 12. The side-lit light source 11 is located on the light-incident side of the dimming structure 12. The side-lit light source 11 is configured to provide incident light to the dimming structure 12. The dimming structure 12 is configured to adjust the light-out direction of the incident light so that collimated light rays are emitted from the light-out side of the dimming structure 12.

[0066] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 1 , Figure 2 , Figures 4-7 As shown, the dimming structure 12 includes a reflective sheet 121 and a light guide plate 122 stacked together. The light guide plate 122 has a light-emitting surface 1221 and a bottom surface 1222 disposed opposite to each other. The bottom surface 1222 of the light guide plate 122 has a plurality of dimming microstructures 001. The reflective sheet 121 is located on the bottom surface 1222 of the light guide plate 122. The incident light is configured to enter from the side surface 1223 of the light guide plate 122.

[0067] The dimming structure 12 also includes: a reverse prism sheet 123 located on the side of the light guide plate 122 facing away from the reflector sheet 121, and a privacy screen 124 located on the side of the reverse prism sheet 123 facing away from the reflector sheet 121. That is, by adding a privacy screen 124 to the reverse prism sheet 123 of a conventional backlight module, collimated backlighting can be achieved to realize privacy display.

[0068] Specifically, the dimming microstructure 001 can be a recess formed on the bottom surface 1222, and the bottom surfaces between adjacent recesses form a protrusion; the dimming microstructure 001 is used to adjust the direction of light so that the light emitted from the light guide plate 122 is more in line with the optimal incident light angle of the reverse prism 123, thereby increasing the positive brightness.

[0069] Of course, the dimming structure 12 may also include other optical functional films, such as diffusers.

[0070] It should be noted that the dimming structure 12 is the same as that in the prior art, and the dimming principle of the dimming structure 12 will not be described in detail in this embodiment.

[0071] It should be noted that the collimated backlight module 1 provided in this embodiment is only one structure capable of emitting collimated light. Of course, it can also be other collimated backlight modules capable of emitting collimated light, all of which fall within the scope of protection of this embodiment.

[0072] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 1 , Figure 2 , Figures 4-7 As shown, the opposing substrate 22 also includes a color resist layer 224 located on the side of the black matrix layer 223 facing away from the substrate 221, a planarization layer 225 located on the side of the color resist layer 224 facing away from the substrate 221, and a spacer layer 226 located on the side of the planarization layer 225 facing away from the substrate 221; wherein, the color resist layer 224 includes a plurality of color resists (e.g., red color resist R, green color resist G and blue color resist B), the color resists (R, G, B) are located in the light-transmitting area AA, and the spacer layer 226 is used to control the cell thickness of the liquid crystal display panel 2.

[0073] In specific implementation, in the above-mentioned privacy display device provided in the embodiments of this disclosure, such as Figure 1 , Figure 2 , Figures 4-7 As shown, the liquid crystal display panel 2 further includes: a liquid crystal layer 23 located between the array substrate 21 and the opposing substrate 22, a first polarizer 24 located on the side of the array substrate 21 away from the opposing substrate 22, and a second polarizer 25 located on the side of the opposing substrate 22 away from the array substrate 21.

[0074] Of course, the liquid crystal display panel 2 also includes other functional film layers, such as pixel electrode layers, common electrode layers, alignment film layers, etc., which will not be described in detail here. Furthermore, the display principle of the liquid crystal display panel 2 is the same as that of the prior art, and will not be described in detail here.

[0075] It should be noted that the liquid crystal display panel provided in the embodiments of this disclosure may include commonly used liquid crystal display modes such as VA type, IPS type, TN type, etc.

[0076] This disclosure provides a privacy display device. By employing a liquid crystal display panel combined with a collimated backlight module, a privacy display function can be achieved. Furthermore, by adding a reflective layer within the opposing substrate, and ensuring that the orthographic projection of the reflective layer on the substrate overlaps with the orthographic projection of at least a portion of the non-transparent area on the substrate, the added reflective layer does not affect normal display. The reflective layer is configured to reflect ambient light, ensuring that the reflected ambient light enters the human eye with consistent intensity at both the frontal and side viewing angles. Due to the collimated backlight module, the display panel's own luminance is lower at the side viewing angle and higher at the front viewing angle. Thus, at the front viewing angle, the reflected ambient light brightness is far lower than the brightness of the light emitted by the display panel itself, not affecting normal display. At the side viewing angle, the reflected ambient light brightness is greater than the brightness of the light emitted by the display panel itself, resulting in a lower proportion of the effective emitted light brightness to the total light brightness seen by the human eye, making it difficult for the human eye to clearly see the displayed content at the side viewing angle. Therefore, this disclosure improves the privacy display effect by employing a collimated backlight module to achieve the privacy display function.

[0077] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.

[0078] Obviously, those skilled in the art can make various modifications and variations to the embodiments of this disclosure without departing from the spirit and scope of the embodiments of this disclosure. Therefore, if these modifications and variations to the embodiments of this disclosure fall within the scope of the claims of this disclosure and their equivalents, this disclosure is also intended to include these modifications and variations.

Claims

1. A privacy display device, wherein, It includes a collimated backlight module and a liquid crystal display panel stacked together, wherein the liquid crystal display panel is located on the light-emitting side of the collimated backlight module; wherein... The liquid crystal display panel includes an array substrate and a counter substrate disposed opposite to each other. The array substrate is closer to the collimating backlight module, and the counter substrate is farther away from the collimating backlight module. The opposing substrate includes: A substrate having a plurality of light-transmitting regions and a non-light-transmitting region located between adjacent light-transmitting regions; A reflective layer is located on the substrate, and the orthographic projection of the reflective layer on the substrate overlaps with the orthographic projection of at least a portion of the non-transparent area on the substrate. The reflective layer is configured to reflect ambient light so that the brightness of the reflected ambient light is consistent at both the frontal and side viewing angles. At the frontal viewing angle, the brightness of the reflected ambient light is much lower than the brightness of the light emitted by the liquid crystal display panel itself. At the side viewing angle, the brightness of the reflected ambient light is greater than the brightness of the light emitted by the liquid crystal display panel itself. The reflective layer is located on the side of the substrate facing the array substrate; the reflective layer is multiplexed as a black matrix layer, which defines the light-transmitting area and the non-light-transmitting area.

2. The privacy display device as claimed in claim 1, wherein, The orthographic projection of the reflective layer on the substrate completely overlaps with the orthographic projection of the non-transparent area on the substrate.

3. The privacy display device as described in claim 1, wherein, The reflective layer is made of metal.

4. The privacy display device as claimed in claim 1, wherein, The reflective layer is grounded.

5. The privacy display device according to any one of claims 1-4, wherein, It also includes a liquid crystal polymer structure located between the collimated backlight module and the liquid crystal display panel; the liquid crystal polymer structure includes: a first substrate and a second substrate disposed opposite to each other, a liquid crystal polymer layer located between the first substrate and the second substrate, a first electrode layer located between the first substrate and the liquid crystal polymer layer, and a second electrode layer located between the second substrate and the liquid crystal polymer layer. The liquid crystal polymer structure is configured to control the refractive index of the liquid crystal polymer layer by an electric field applied between the first electrode layer and the second electrode layer, so that the liquid crystal polymer layer switches between a transparent state and an opaque state.

6. The privacy display device according to any one of claims 1-4, wherein, The collimated backlight module includes a side-lit light source and a dimming structure. The side-lit light source is located on the light-incident side of the dimming structure. The side-lit light source is configured to provide incident light to the dimming structure. The dimming structure is configured to adjust the exit direction of the incident light so that collimated light rays are emitted from the light-out side of the dimming structure.

7. The privacy display device as claimed in claim 6, wherein, The dimming structure includes a reflective sheet and a light guide plate stacked together. The light guide plate has a light-emitting surface and a bottom surface arranged opposite to each other. The bottom surface of the light guide plate has a plurality of dimming microstructures. The reflective sheet is located on the bottom surface of the light guide plate. The incident light is configured to enter from the side of the light guide plate. The dimming structure further includes: a reverse prism sheet located on the side of the light guide plate opposite to the reflective sheet, and a privacy film located on the side of the reverse prism sheet opposite to the reflective sheet.

8. The privacy display device as described in claim 1 or 2, wherein, The opposing substrate further includes a color resist layer located on the side of the black matrix layer opposite to the substrate, a planarization layer located on the side of the color resist layer opposite to the substrate, and a spacer layer located on the side of the planarization layer opposite to the substrate; wherein, the color resist layer includes a plurality of color resists, and the color resists are located in the light-transmitting area.

9. The privacy display device according to any one of claims 1-4, wherein, The liquid crystal display panel further includes: a liquid crystal layer located between the array substrate and the opposing substrate, a first polarizer located on the side of the array substrate facing away from the opposing substrate, and a second polarizer located on the side of the opposing substrate facing away from the array substrate.

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