Display device

Abstract

The invention provides a display device which comprises a backlight source structure, a display module and a photosensitive antibacterial layer, the backlight source structure comprises a light-emitting unit group, the light-emitting unit group comprises at least one first light-emitting unit and at least one second light-emitting unit, and the first light-emitting unit is used for emitting visible light; the second light-emitting unit is used for emitting ultraviolet light; the photosensitive antibacterial layer is arranged on one side of the light-emitting surface of the display module and is used for realizing an antibacterial effect under the catalytic action of ultraviolet light. According to the display device provided by the invention, sterilization and antibiosis of the surface of the display module can be realized, metal ions do not need to be introduced, the display device is not limited to a certain degree in the aspect of market access, and in addition, the display device can be used in specific environments with ultraviolet light such as medical treatment and outdoor.

Description

Display device Technical Field

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

[0002] As electronic terminals gradually become indispensable products in people's daily work and life, existing electronic terminals such as mobile phone screens, tablet computers, keyboards, and game consoles are prone to the adhesion of dirt and sweat from the user's hands on the screen surface during use, which can easily breed bacteria and mold on the screen surface, posing a threat to the user's health. In order to solve the above technical problems, the existing technology usually introduces Ag on the screen surface. + , Cu + or Zn + The metal ions such as etc. can achieve the effect of sterilization and disinfection.

[0003] However, due to the unknown effects of metal ions on human health and the biological environment, such metal ions are subject to certain restrictions in market access.

[0004] Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art and proposes a display device that can not only achieve sterilization and antibacterial properties on the surface of a display module, but also does not require the introduction of metal ions and is not subject to certain restrictions in market access. In addition, it is not limited to use in specific environments with ultraviolet light, such as medical and outdoor environments.

[0006] To achieve the above objectives, an embodiment of the present disclosure provides a display device, comprising a backlight structure, a display module, and a photosensitive antibacterial layer, wherein the backlight structure comprises a light-emitting unit group, wherein the light-emitting unit group comprises at least one first light-emitting unit and at least one second light-emitting unit, wherein the first light-emitting unit is configured to emit visible light; and the second light-emitting unit is configured to emit ultraviolet light;

[0007] The photosensitive antibacterial layer is arranged on the light-emitting surface side of the display module, and is used to achieve antibacterial effect under the catalytic effect of ultraviolet light.

[0008] Optionally, there are multiple first light-emitting units in the light-emitting unit group, and the multiple first light-emitting units are arranged at intervals;

[0009] The second light emitting units are arranged at intervals on a line connecting any two of the first light emitting units.

[0010] Optionally, among the plurality of first light-emitting units, two of the first light-emitting units on the line where the second light-emitting unit is located are respectively a first sub-light-emitting unit and a second sub-light-emitting unit;

[0011] The distance between the first sub-light emitting unit and the second sub-light emitting unit is a first distance, and the minimum distance between two adjacent first light emitting units is a second distance;

[0012] The first sub-light emitting unit and the second sub-light emitting unit are not adjacent to each other, and the first distance is greater than the second distance; or the first sub-light emitting unit and the second sub-light emitting unit are adjacent to each other, and the first distance is equal to the second distance.

[0013] Optionally, a plurality of the first light-emitting units are arranged to form a preset polygon;

[0014] There is one second light emitting unit located at the geometric center of the preset polygon, and the second light emitting unit is equidistant from each of the first light emitting units arranged to form the preset polygon.

[0015] Optionally, the number of the first light emitting units is four, and the preset polygon formed by the arrangement includes a square;

[0016] The second light emitting unit is located at the geometric center of the square and is equidistant from the four first light emitting units.

[0017] Optionally, there are three first light-emitting units, and the preset polygon formed by arrangement includes an equilateral triangle;

[0018] The second light-emitting unit is located at the geometric center of the equilateral triangle and is equidistant from the three first light-emitting units;

[0019] There are multiple groups of light-emitting units, and the multiple groups of light-emitting unit groups are arranged in an array relative to the light-emitting surface of the display module; wherein, every two groups of light-emitting unit groups share two adjacent first light-emitting units, so that the two equilateral triangles formed by every two groups of light-emitting unit groups share one side.

[0020] Optionally, a plurality of the first light-emitting units are arranged to form a preset polygon;

[0021] There are multiple second light emitting units located on each side of the preset polygon, and the distance between each second light emitting unit and the two first light emitting units on the side are equal.

[0022] Optionally, the number of the first light emitting units is four, and the preset polygon formed by the arrangement includes a square;

[0023] There are four second light emitting units, which are respectively located on four sides of the square, and the distance between each second light emitting unit and the two first light emitting units on the side where the second light emitting unit is located is equal.

[0024] Optionally, there is another second light-emitting unit or the first light-emitting unit located at the geometric center of the preset polygon, and the distances between the second light-emitting unit and the first light-emitting units arranged to form the preset polygon are equal.

[0025] Optionally, the second distance is equal to 7.5 mm.

[0026] Optionally, there are multiple groups of light-emitting units, and the multiple groups of light-emitting unit groups are arranged in an array relative to the light-emitting surface of the display module; each two adjacent groups of light-emitting unit groups share at least one of the first light-emitting units and / or at least one of the second light-emitting units adjacent to each other.

[0027] Optionally, the backlight structure further includes a light guide plate, and the light guide plate is arranged on a side away from the light emitting surface of the display module;

[0028] The light emitting unit group is provided on at least one side of the light guide plate, the light emitting unit group includes a plurality of the first light emitting units and a plurality of the second light emitting units, and the plurality of the first light emitting units and the plurality of the second light emitting units on the same side are arranged along the extension direction of the corresponding side of the light guide plate;

[0029] The first light emitting units and the second light emitting units on the same side are arranged alternately.

[0030] Optionally, the backlight structure further includes a light guide plate, and the light guide plate is arranged on a side away from the light emitting surface of the display module;

[0031] The light emitting unit group includes a first sub-light emitting unit group and a second sub-light emitting unit group, wherein the first sub-light emitting unit group includes a plurality of the first light emitting units, and the second sub-light emitting unit group includes a plurality of the second light emitting units, wherein,

[0032] A plurality of the first light emitting units are provided on at least one side of the light guide plate, and the plurality of the first light emitting units on the same side are arranged along an extension direction of the corresponding side of the light guide plate;

[0033] A plurality of second light emitting units are provided on at least one side of the light guide plate, and the plurality of second light emitting units on the same side are arranged along an extension direction of the corresponding side of the light guide plate;

[0034] The first light emitting unit and the second light emitting unit are located on different sides of the light guide plate.

[0035] Optionally, the first light emitting unit is configured to emit monochromatic light;

[0036] The display device further includes a light conversion layer, which is disposed on a side away from the light-emitting surface of the display module and is configured to convert the monochromatic light emitted by the first light-emitting unit into white light.

[0037] Optionally, the first light-emitting unit is configured to emit white light.

[0038] Optionally, the first light-emitting unit includes a first sub-light-emitting chip, a second sub-light-emitting chip and a third sub-light-emitting chip, wherein the first sub-light-emitting chip is used to emit blue light; the second sub-light-emitting chip is used to emit red light; and the third sub-light-emitting chip is used to emit green light.

[0039] Optionally, the display device further includes:

[0040] a bandpass filter structure, disposed on a side of the photosensitive antibacterial layer facing away from the display panel;

[0041] The bandpass filter structure includes a microstructure arranged on a surface of the photosensitive antibacterial layer facing away from the display panel.

[0042] Optionally, the microstructure includes a photonic crystal structure, and the photonic crystal structure includes a plurality of protrusions arranged in an array on a surface of the photosensitive antibacterial layer on a side facing away from the display panel.

[0043] Optionally, the sum of the size of each protrusion in the first direction and the interval between adjacent protrusions in the first direction is greater than or equal to 130 nm and less than or equal to 160 nm; the size of each protrusion in the first direction is greater than or equal to 74 nm and less than or equal to 90 nm; and the height of each protrusion is greater than or equal to 100 nm and less than or equal to 500 nm.

[0044] The first direction is a row direction or a column direction of an array in which the plurality of protrusions are arranged.

[0045] Optionally, the height of each protrusion is 100 nm; the sum of the size of each protrusion in the first direction and the interval between adjacent protrusions in the first direction is 140 nm; and the size of each protrusion in the first direction is 80 nm.

[0046] Optionally, the photosensitive antibacterial layer has an antibacterial nanostructure. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] FIG1 is a partial cross-sectional schematic diagram of a first direct-lit display device used in an embodiment of the present invention;

[0048] FIG2 is a partial cross-sectional schematic diagram of a second direct-type display device used in an embodiment of the present invention;

[0049] FIG3 is a first arrangement diagram of four groups of light-emitting units in a direct-lit display device used in an embodiment of the present invention;

[0050] FIG4 is a second arrangement diagram of four light-emitting unit groups in the direct-lit display device used in an embodiment of the present invention;

[0051] FIG5 is a third arrangement diagram of four light-emitting unit groups in the direct-lit display device used in an embodiment of the present invention;

[0052] FIG6 is a fourth arrangement diagram of two groups of light-emitting units in the direct-lit display device used in an embodiment of the present invention;

[0053] FIG7 is a fifth arrangement diagram of two groups of light-emitting units in the direct-lit display device used in an embodiment of the present invention;

[0054] FIG8 is a partial cross-sectional schematic diagram of a first edge-lit display device used in an embodiment of the present invention;

[0055] FIG9 is a first arrangement diagram of the light-emitting unit groups in the edge-type display device used in an embodiment of the present invention;

[0056] FIG10 is a second arrangement diagram of the light-emitting unit groups in the edge-lit display device according to an embodiment of the present invention;

[0057] FIG11 is a third arrangement diagram of the light-emitting unit groups in the edge-type display device used in an embodiment of the present invention;

[0058] FIG12 is a partial cross-sectional schematic diagram of a second edge-lit display device used in an embodiment of the present invention;

[0059] FIG13 is a partial cross-sectional schematic diagram of multiple protrusions of a photonic crystal structure used in an embodiment of the present invention;

[0060] FIG14 is a schematic top view of multiple protrusions of the first photonic crystal structure used in an embodiment of the present invention;

[0061] FIG15 is a schematic top view of multiple protrusions of the second photonic crystal structure used in an embodiment of the present invention. DETAILED DESCRIPTION

[0062] To make the objectives, technical solutions, and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0063] The shapes and sizes of the components in the drawings do not reflect the actual proportions, and are only intended to facilitate understanding of the contents of the embodiments of the present invention.

[0064] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0065] The embodiments of the present disclosure are not limited to the embodiments shown in the drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the drawings are schematic in nature, and the shapes of the regions shown in the drawings illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.

[0066] Please refer to Figure 1. An embodiment of the present invention provides a display device, including a backlight structure, a display module and a photosensitive antibacterial layer 10, wherein the display module includes but is not limited to a display panel 8, a transparent cover plate 9 arranged on the light-emitting side of the display panel 8, and an optical film layer arranged on the light-emitting side away from the display panel 8. The optical film layer includes, for example, a multilayer optical film material such as a lower diffusion film 7 and a prism film 6, wherein the lower diffusion film 7 is used to diffuse light; the prism film 6 is used to increase the brightness of light. Optionally, an upper diffusion film or other functional film materials may also be added.

[0067] The backlight source structure includes a base substrate 1 and a light-emitting unit group arranged on the base substrate 1, and the light-emitting unit group includes at least one first light-emitting unit 2 and at least one second light-emitting unit 3, wherein the first light-emitting unit 2 is used to emit visible light, and the wavelength of the visible light can be approximately in the range of 380nm to 700nm. The visible light emitted by the first light-emitting unit 2 is used as the backlight for the display module to display an image. The backlight source structure can also include a driving circuit connecting each first light-emitting unit 2 and each second light-emitting unit 3, and the driving circuit can be connected to the control circuit to drive each first light-emitting unit 2 and each second light-emitting unit 3 to emit light according to the electrical signal input by the control circuit. The driving circuit can be an active driving circuit or a passive driving circuit. In addition, the backlight source structure also includes a light guide plate 4, which is arranged on the side of the light-emitting surface away from the display panel 8 and is located between the above-mentioned optical film layer and the above-mentioned light-emitting unit group.

[0068] The first light-emitting unit 2 can be used to emit visible light of one or more different wavelengths. In some embodiments of the present invention, the first light-emitting unit 2 is used to emit monochromatic light (light of a single color), such as blue light or green light. In this case, to obtain white light, the display device further includes a light conversion layer 5, as shown in FIG1 . The light conversion layer 5 is disposed on a light-emitting surface facing away from the display module, such as on the light-emitting surface of a light guide plate, and is used to convert the monochromatic light emitted by the first light-emitting unit 2 into white light. The light conversion layer 5 is, for example, a light diffuser (also known as a quantum dot enhancement film, QDEF).

[0069] In other embodiments of the present invention, the first light-emitting unit 2 is used to directly emit white light. In this case, the above-mentioned light conversion layer 5 does not need to be provided, so there is no problem of the life of the light conversion layer 5 being shortened due to the irradiation of the ultraviolet light emitted by the second light-emitting unit 3. Alternatively, the first light-emitting unit 2 can also be composed of a plurality of sub-light-emitting chips that emit monochromatic light of different wavelengths, and the monochromatic light of different wavelengths emitted by the plurality of sub-light-emitting chips can be mixed to form white light. For example, referring to Figure 2, the first light-emitting unit 2 includes a first sub-light-emitting chip 21, a second sub-light-emitting chip 22 and a third sub-light-emitting chip 23, wherein the first sub-light-emitting chip 21 is used to emit blue light; the second sub-light-emitting chip 22 is used to emit red light; and the third sub-light-emitting chip 23 is used to emit green light. In this case, the above-mentioned light conversion layer 5 is also not required to be provided.

[0070] The second light-emitting unit 3 is used to emit ultraviolet light, and the wavelength of the ultraviolet light is less than 385nm. The photosensitive antibacterial layer 10 is arranged on the light-emitting side of the display module, and is used to achieve antibacterial effect under the catalytic action of ultraviolet light. The photosensitive antibacterial layer 10 includes, for example, titanium dioxide (TiO2), which can oxidize the dirt and bacteria on the surface of the photosensitive antibacterial layer 10 into gas or substances that can be easily wiped off under the catalytic action of ultraviolet light irradiated thereon, thereby avoiding the growth of bacteria and achieving the effect of sterilization and disinfection. The thickness of the photosensitive antibacterial layer 10 is, for example, greater than or equal to 100nm and less than or equal to 100μm. As shown in Figures 1 and 2, the photosensitive antibacterial layer 10 can be specifically disposed on the surface of the transparent cover plate 9 in the display module facing away from the display panel 8. However, the embodiments of the present invention are not limited to this. In actual applications, the photosensitive antibacterial layer 10 can also be disposed on the surface of the transparent cover plate 9 facing the display panel 8; or on the surface of the upper polarizer (POL); or on the surface of a protective layer (e.g., an AF film) or incorporated into the material of the protective layer. In other words, the photosensitive antibacterial layer 10 does not necessarily have to be disposed on the outermost surface of the display module facing the light output direction. When the photosensitive antibacterial layer 10 is disposed on a non-outermost surface, such as the surface of the transparent cover plate 9 facing the display panel 8, particles of the photosensitive antibacterial layer 10 can penetrate the outer film layer to reach the outermost surface of the display module and react with dirt and bacteria. Therefore, even if the photosensitive antibacterial layer 10 is not disposed on the outermost surface, it can still achieve a sterilization and disinfection effect. In actual applications, the photosensitive antibacterial layer 10 can be applied to the surface of the corresponding film layer by spraying, coating, screen printing, deposition, etc.

[0071] The light-emitting unit group in the backlight source structure, on the basis of including at least one first light-emitting unit 2 to realize normal image display, also includes at least one second light-emitting unit 3 that emits ultraviolet light, which can be used in conjunction with the photosensitive antibacterial layer 10. It can not only achieve the sterilization and antibacterial effect on the surface of the display module displaying the image, but also does not require the introduction of metal ions, and will not be subject to certain restrictions in market access. In addition, it is not limited to use in specific environments with ultraviolet light such as medical and outdoor environments, and can be applied to more fields.

[0072] In some embodiments of the present invention, the first light-emitting unit 2 and the second light-emitting unit 3 are both light-emitting diode chips, preferably micro light-emitting diodes (Mini□LED / Micro□LED) with the advantages of high brightness, high contrast, fast response and low power consumption.

[0073] It should be noted that, during use, the control circuit can drive each first light-emitting unit 2 and each second light-emitting unit 3 to emit light individually, or can also drive each first light-emitting unit 2 and each second light-emitting unit 3 to emit light simultaneously. Preferably, considering the health of the user, it is recommended that when the user is not using the display device, each second light-emitting unit 3 be driven to emit light individually to sterilize the surface of the display device displaying the image, and when the display device is in use, each first light-emitting unit 2 be driven to emit light individually.

[0074] The display device provided by the embodiments of the present invention can be a direct-lit display device or an edge-lit display device. Taking a direct-lit display device as an example, as shown in Figures 1 and 2 , there can be multiple light-emitting unit groups, which are arranged on the side facing away from the light-emitting surface of the display module. Specifically, they are disposed on the substrate 1 and located on the side of the light guide plate 4 facing away from the display module. Furthermore, as shown in Figure 3 , four light-emitting unit groups are arranged as an example. In actual applications, more light-emitting unit groups can be arranged in the same arrangement as these four light-emitting unit groups. Specifically, the four light-emitting unit groups are arranged in an array relative to the light-emitting surface of the display module; each of the two adjacent light-emitting unit groups shares at least one first light-emitting unit 2 and / or at least one second light-emitting unit 3 that is adjacent to each other. "Sharing" means that the first light-emitting unit 2 and / or the second light-emitting unit 3 belongs to both one of the two adjacent light-emitting unit groups and the other. Of course, the shared first light-emitting unit 2 and / or the second light-emitting unit 3 must be located between the two adjacent light-emitting unit groups.

[0075] By using multiple groups of light-emitting units arranged in an array, uniform light output from the entire backlight structure can be ensured. Furthermore, by providing at least one second light-emitting unit 3 in each light-emitting unit group, different areas of the photosensitive antibacterial layer 10 can be irradiated by ultraviolet light, thereby ensuring that the entire display surface of the display module is sterilized.

[0076] In some embodiments of the present invention, to improve display contrast and achieve localized dimming, the light-emitting unit group includes multiple first light-emitting units 2, with the multiple first light-emitting units 2 spaced apart; furthermore, the second light-emitting units 3 are spaced apart and located on the line connecting any two first light-emitting units 2. By spacing the second light-emitting units 3 from any first light-emitting units 2 and positioning them on the line connecting any two first light-emitting units 2, the uniformity of light output from the overall backlight structure can be ensured, while ensuring that the entire display image surface of the display module can be sterilized. Furthermore, the display contrast and grayscale of different light-emitting unit groups will not be affected by the arrangement of the second light-emitting units 3.

[0077] There are many ways to achieve the above-mentioned effect by disposing the second light-emitting units 3 at intervals on the line connecting any two first light-emitting units 2. For example, among multiple first light-emitting units 2, the two first light-emitting units 2 on the line connecting the second light-emitting unit 3 are respectively the first sub-light-emitting unit and the second sub-light-emitting unit. The first sub-light-emitting unit and the second sub-light-emitting unit here are two first light-emitting units 2 on the line connecting the multiple first light-emitting units 2 on which the second light-emitting unit 3 is disposed. The distance between the first sub-light-emitting unit and the second sub-light-emitting unit is the first distance D1, and the minimum distance between two adjacent first light-emitting units 2 is the second distance D2. In addition, as shown in Figures 3 and 6, the first sub-light-emitting unit and the second sub-light-emitting unit are not adjacent, and the first distance D1 is greater than the second distance D2; or, as shown in Figure 4, the first sub-light-emitting unit and the second sub-light-emitting unit are adjacent, and the first distance D1 is equal to the second distance D2. It should be noted that the first distance D1 and the second distance D2 are both defined as the center distance between the light-emitting units.

[0078] For the case where the first sub-light-emitting unit and the second sub-light-emitting unit are not adjacent and the first distance D1 is greater than the second distance D2, or the case where the first sub-light-emitting unit and the second sub-light-emitting unit are adjacent and the first distance D1 is equal to the second distance D2, the second light-emitting unit 3 on the connecting line between the first sub-light-emitting unit and the second sub-light-emitting unit can ensure that the entire display image surface of the display module can be sterilized and disinfected, while ensuring the overall light uniformity of the backlight source structure, as well as the display contrast and grayscale of different light-emitting unit groups, will not be affected by the arrangement of the second light-emitting unit 3.

[0079] In the case where the first and second sub-light-emitting units are not adjacent, and the first distance D1 is greater than the second distance D2, multiple first light-emitting units 2 can be arranged to form a predetermined polygon A, such as the square shown in Figures 3 to 5, or the equilateral triangle shown in Figure 6. Furthermore, there is only one second light-emitting unit 3, located at the geometric center of the predetermined polygon A. Furthermore, the distances between the second light-emitting unit 3 and each of the first light-emitting units 2 arranged to form the predetermined polygon A are equal. This ensures uniform light output from the entire backlight structure, as well as consistent display contrast and grayscale across different light-emitting unit groups.

[0080] For example, as shown in FIG3 , there are four first light-emitting units 2, and the preset polygon A formed by the arrangement includes a square; the second light-emitting unit 3 is located at the geometric center of the square and is equidistant from the four first light-emitting units 2, that is, multiple first light-emitting units 2 are equidistantly distributed on the same circumference B, and the second light-emitting unit 3 is located at the center of the circumference B. Specifically, as shown in FIG3 , among the four first light-emitting units 2, the two first light-emitting units 2 located on the diagonal of the square are the first sub-light-emitting unit and the second sub-light-emitting unit, respectively, that is, the second light-emitting unit 3 is located on the diagonal of the square, and can be located at the midpoint of the diagonal of the square. In this case, the first distance D1 is the length of the diagonal of the square, the second distance D2 is the length of the side of the square, and the first distance D1 is greater than the second distance D2. By making the second light-emitting unit 3 located at the geometric center of the square and equidistant from the four first light-emitting units 2, the light uniformity of the entire backlight structure can be better guaranteed, and the display contrast and grayscale consistency of different light-emitting unit groups can be guaranteed.

[0081] In some embodiments of the present invention, the second distance D2 is equal to 7.5 mm.

[0082] For another example, as shown in FIG6 , there are three first light-emitting units 2 arranged to form a predetermined polygon A comprising an equilateral triangle; the second light-emitting unit 3 is located at the geometric center of the equilateral triangle and is equidistant from the three first light-emitting units 2. That is, the plurality of first light-emitting units 2 are equidistantly distributed on the same circumference B, and the second light-emitting unit 3 is located at the center of the circumference B. Specifically, FIG6 shows four light-emitting unit groups. As shown in FIG6 , each two light-emitting unit groups share two adjacent first light-emitting units 2, so that the two equilateral triangles formed by each two light-emitting unit groups share a side, namely, side C3 in FIG6 . In this case, the two first light-emitting units 2 opposite the shared side of each two light-emitting unit groups are respectively a first sub-light-emitting unit and a second sub-light-emitting unit. That is, the second light-emitting unit 3 in each light-emitting unit group is located on the line connecting the two first light-emitting units 2 opposite the shared side of each two light-emitting unit groups, namely, line C2 in FIG6 . Furthermore, the second light-emitting unit 3 in each light-emitting unit group is located at the geometric center of the equilateral triangle and is equidistant from the three first light-emitting units 2. In this case, the first distance D1 is the length of the line C2, and the second distance D2 is the length of the side of the equilateral triangle, with the first distance D1 being greater than the second distance D2. By locating the second light-emitting unit 3 at the geometric center of the equilateral triangle and equidistant from the three first light-emitting units 2, the uniformity of light output from the entire backlight structure can be better ensured, as well as consistent display contrast and grayscale across different light-emitting unit groups.

[0083] 6 , the two light emitting unit groups that share two adjacent first light emitting units 2 are sequentially arranged with the other two adjacent light emitting unit groups in the extension direction of the shared side, and share one adjacent first light emitting unit 2. Of course, in actual applications, the two light emitting unit groups that share two adjacent first light emitting units 2 and the other two adjacent light emitting unit groups can also be arranged in other ways, and the embodiments of the present invention are not particularly limited in this regard.

[0084] When the first and second sub-light-emitting units are adjacent, and the first distance D1 is equal to the second distance D2, multiple first light-emitting units 2 are arranged to form a predetermined polygon A. Multiple first light-emitting units 2 are located on each side of the predetermined polygon A, and each second light-emitting unit 3 is equidistant from the two first light-emitting units 2 on its side. This ensures uniform light output across the entire backlight structure, as well as consistent display contrast and grayscale across different light-emitting unit groups.

[0085] For example, referring to Figure 4 , there are four first light-emitting units 2 arranged to form a predetermined polygon A comprising a square. There are four second light-emitting units 3, each located on one of the four sides C1 of the square. Furthermore, the distance E between each second light-emitting unit 3 and the two first light-emitting units 2 on that side is equal. In this case, of the four first light-emitting units 2, the two first light-emitting units 2 located on each side C1 of the square are the first sub-light-emitting unit and the second sub-light-emitting unit, respectively. That is, the second light-emitting units 3 are located on each side C1 of the square, specifically, at the midpoint of each side C1 of the square. In this case, the first distance D1 is the side length of the square, and the second distance D2 is also the side length of the square, and the first distance D1 is equal to the second distance D2. By locating the second light-emitting units 3 on each side C1 of the square, and making the distance E between each second light-emitting unit 3 and the two first light-emitting units 2 on the side C1 equal, the four first light-emitting units 2 can be evenly distributed on the same circumference B, and the second light-emitting units 3 distributed on the side C1 must also be evenly distributed on the same circumference (another circumference different from the circumference B). In this way, the arrangement rule of the second light-emitting units 3 can be the same as or similar to the arrangement rule of the first light-emitting units 2, thereby ensuring that the setting of the second light-emitting units 3 will not affect the display contrast and local area dimming.

[0086] It should be noted that, in practical applications, the preset polygon A may also be any other polygon, such as a regular hexagon, etc., and the embodiment of the present invention has no particular limitation on this.

[0087] Further optionally, to further improve light uniformity, please refer to FIG. 5 . In addition to the light-emitting unit group used in FIG. 4 , a first light-emitting unit 2' is provided at the geometric center of a preset polygon A, and is equidistant from each of the first light-emitting units 2 arranged to form the preset polygon A. Specifically, as shown in FIG. 5 , there are five first light-emitting units, four of which are arranged to form a square polygon A. Another first light-emitting unit 2' is provided at the geometric center of the square, and is equidistant from each of the four first light-emitting units 2. That is, the four first light-emitting units 2 are equidistantly distributed on the same circumference B, and the first light-emitting unit 2' is located at the center of the circumference B. This also ensures that the configuration of the second light-emitting unit 3 does not affect display contrast and local area dimming.

[0088] In the case where the first light-emitting unit 2 is composed of multiple sub-light-emitting chips that emit monochromatic light of different wavelengths, for example, as shown in FIG7 , the first light-emitting unit 2 includes a first sub-light-emitting chip 21, a second sub-light-emitting chip 22, and a third sub-light-emitting chip 23. The first sub-light-emitting chip 21 is configured to emit blue light; the second sub-light-emitting chip 22 is configured to emit red light; and the third sub-light-emitting chip 23 is configured to emit green light. In this case, the arrangement rules for the combination of multiple sub-light-emitting chips are the same as the arrangement rules for the first light-emitting unit 2 consisting of a single chip. For example, taking each light-emitting unit group as having three first light-emitting units 2 and the pre-set polygon A being an equilateral triangle, a second light-emitting unit 3 is disposed at the geometric center of the equilateral triangle. Each first light-emitting unit 2 includes a first sub-light-emitting chip 21, a second sub-light-emitting chip 22, and a third sub-light-emitting chip 23. Optionally, to ensure a color mixing effect, the first sub-light-emitting chip 21, the second sub-light-emitting chip 22, and the third sub-light-emitting chip 23 are equidistantly distributed on the same circumference (a circumference different from circumference B). It should be noted that the above-mentioned three first light-emitting units 2 are equidistantly distributed on the same circumference B, which does not mean that the first sub-light-emitting chip 21, the second sub-light-emitting chip 22 and the third sub-light-emitting chip 23 are distributed on the same circumference B. Taking the first sub-light-emitting chip 21, the second sub-light-emitting chip 22 and the third sub-light-emitting chip 23 as an example, the center of the circumference (the other circumference different from the circumference B) is located on the circumference B.

[0089] In the case where the display device is an edge-type display device, in some embodiments of the present invention, please refer to Figures 8 and 9 together. The backlight source structure also includes a light guide plate 4, which is arranged on the light-emitting surface side away from the display module; a light-emitting unit group is provided on at least one side of the light guide plate 4, and the light-emitting unit group includes a plurality of first light-emitting units 2 and a plurality of second light-emitting units 3. For example, as shown in Figure 9, a plurality of first light-emitting units 2 and a plurality of second light-emitting units 3 are provided on all four sides of the light guide plate 4, but the embodiments of the present invention are not limited to this. In actual applications, a plurality of first light-emitting units 2 and a plurality of second light-emitting units 3 may also be provided on one of the sides of the light guide plate 4, or a plurality of first light-emitting units 2 and a plurality of second light-emitting units 3 may be provided on two of the sides of the light guide plate 4, or a plurality of first light-emitting units 2 and a plurality of second light-emitting units 3 may be provided on three of the sides of the light guide plate 4.

[0090] As shown in Figure 9, multiple first light-emitting units 2 and multiple second light-emitting units 3 on the same side are arranged along the extension direction of the corresponding side edge of the light guide plate; the first light-emitting units 2 and second light-emitting units 3 on the same side are arranged alternately. By disposing multiple second light-emitting units 3 on at least one side of the light guide plate 4, it can be used in conjunction with the photosensitive antibacterial layer 10 to not only sterilize the display module surface, but also eliminate the need for the introduction of metal ions, thus avoiding certain market access restrictions. Furthermore, it is not limited to specific environments with ultraviolet light, such as medical and outdoor environments, making it applicable to a wider range of fields.

[0091] By arranging the first light-emitting units 2 and the second light-emitting units 3 on the same side alternately, not only can the arrangement of the second light-emitting units 3 not affect the display contrast and light uniformity, but it can also ensure that different areas of the photosensitive antibacterial layer 10 can be irradiated by ultraviolet light. In addition, in other embodiments of the present invention, as shown in Figure 10, when the first light-emitting units 2 and the second light-emitting units 3 are arranged alternately on the same side, compared to the arrangement of Figure 9, the positions of the first light-emitting units 2 and the second light-emitting units 3 can also be interchanged.

[0092] In the case where the display device is an edge-entry display device, in other embodiments of the present invention, as shown in FIG11 , the light-emitting unit group includes a first sub-light-emitting unit group and a second sub-light-emitting unit group, wherein the first sub-light-emitting unit group includes a plurality of first light-emitting units 2, and the second sub-light-emitting unit group includes a plurality of second light-emitting units 3, wherein a plurality of first light-emitting units 2 are provided on at least one side of the light guide plate 4, and the plurality of first light-emitting units 2 on the same side are arranged along the extension direction of the corresponding side of the light guide plate 4; a plurality of second light-emitting units 3 are provided on at least one side of the light guide plate 4, and the plurality of second light-emitting units 3 on the same side are arranged along the extension direction of the corresponding side of the light guide plate 4; and the first light-emitting units 2 and the second light-emitting units 3 are located on different sides of the light guide plate. For example, in FIG11 , a plurality of second light-emitting units 3 are provided on the right side of the light guide plate 4, and a plurality of first light-emitting units 2 are provided on the other three sides.

[0093] In some embodiments of the present invention, as shown in FIG12 , the display device further includes a bandpass filter structure 11, disposed on the side of the photosensitive antimicrobial layer 10 facing away from the display panel 8. Bandpass filter structure 11 is configured to transmit at least a portion of visible light and reflect or diffract ultraviolet light. Bandpass filter structure 11 can block the transmission of ultraviolet light or other specific wavelengths of light, preventing damage to the human eye caused by prolonged exposure to ultraviolet light or other specific wavelengths of light.

[0094] In some embodiments of the present invention, the bandpass filter structure 11 includes a microstructure disposed on a surface of the film layer facing away from the display module. The microstructure is configured to transmit at least a portion of visible light and reflect or diffract ultraviolet light. The microstructure may include a photonic crystal structure, a holographic grating, a waveguide grating combination structure, a plasma structure, or the like.

[0095] Taking the microstructure as an example, a photonic crystal structure refers to a periodic dielectric structure with a photonic band gap (PBG) characteristic. Specifically, referring to Figures 13 and 14 , the photonic crystal structure includes a plurality of protrusions 111 arranged in an array on the surface of the photosensitive antibacterial layer 10 facing away from the display panel 8. The plurality of protrusions 111 are arranged periodically to achieve wavelength selection, that is, selectively allowing at least a portion of visible light to pass through while blocking ultraviolet light.

[0096] In some embodiments of the present invention, as shown in Figure 14, the orthographic projection shape of the protrusion 111 on the surface of the sensitive antibacterial layer 10 facing away from the display panel 8 is circular; as shown in Figure 15, the orthographic projection shape of the protrusion 111 on the surface of the sensitive antibacterial layer 10 facing away from the display panel 8 is square. However, the embodiments of the present invention are not limited to this. In actual applications, the orthographic projection shape of the protrusion 111 on the surface of the sensitive antibacterial layer 10 facing away from the display panel 8 can also be any other shape, and the embodiments of the present invention have no special restrictions on this.

[0097] In some embodiments of the present invention, as shown in Figures 14 and 15 , the sum F of the dimension F1 of each protrusion 111 in the first direction and the spacing F2 between adjacent protrusions 111 in the first direction (i.e., F = F1 + F2) is greater than or equal to 130 nm and less than or equal to 160 nm; the dimension F1 of each protrusion 111 in the first direction is greater than or equal to 74 nm and less than or equal to 90 nm; and as shown in Figure 13 , the height H of each protrusion 111 is greater than or equal to 100 nm and less than or equal to 500 nm. The first direction is the row direction (i.e., the X direction) or the column direction (i.e., the Y direction) of the array in which the plurality of protrusions 111 are arranged. The row direction and the column direction may be parallel to the directions in which the long side and the short side of the light guide plate 4 extend, respectively. In addition, if the orthographic projection shape of the protrusion 111 on the surface of the sensitive antibacterial layer 10 facing away from the display panel 8 is a circle, the dimension F1 of each protrusion 111 in the first direction is the diameter of the circle; if the orthographic projection shape of the protrusion 111 on the surface of the sensitive antibacterial layer 10 facing away from the display panel 8 is a square, the dimension F1 of each protrusion 111 in the first direction is the side length of the square.

[0098] By adopting the above numerical range, it is possible to ensure that light with a wavelength below 400nm is reflected, thereby ensuring the reflection effect of ultraviolet light. Preferably, the height H of each protrusion 111 is 100nm; the sum of the dimension F1 of each protrusion 111 in the first direction and the spacing F2 between adjacent protrusions 111 in the first direction is 140nm; and the dimension F1 of each protrusion 111 in the first direction is 80nm. By adopting the above numerical range, not only can the transmittance of visible light be maximized, but light in the short wavelength range can also be reflected and diffracted. The transmittance of non-visible light in the short wavelength range does not exceed 5%, so the impact on the human eye is basically negligible. The reflected ultraviolet light can also re-activate the photosensitive antibacterial layer 10, further enhancing the antibacterial properties.

[0099] In summary, the display device provided by the embodiment of the present invention has a backlight source structure that, on the basis of setting at least one first light-emitting unit 2 to achieve normal image display, adds at least one second light-emitting unit 3 that emits ultraviolet light, which can be used in conjunction with the photosensitive antibacterial layer 10. This not only can achieve sterilization and antibacterial effect on the surface of the display module, but also does not require the introduction of metal ions, and will not be subject to certain restrictions in market access. In addition, it is not limited to use in specific environments with ultraviolet light, such as medical and outdoor environments, and can be applied to more fields.

[0100] As another technical solution, an embodiment of the present invention further provides a light-emitting substrate, comprising a base substrate and a light-emitting unit group disposed on the base substrate, wherein the light-emitting unit group includes at least one first light-emitting unit and at least one second light-emitting unit. The base substrate may be a flexible substrate or a rigid substrate. In the case of a flexible substrate, the base substrate may be made of PI (Polyimide) material. In the case of a rigid substrate, the base substrate may be made of glass.

[0101] The light-emitting substrate may further include a drive circuit connected to each of the first light-emitting units and each of the second light-emitting units. The drive circuit may be connected to the control circuit to drive each of the first light-emitting units and each of the second light-emitting units to emit light according to an electrical signal input by the control circuit. The drive circuit may be an active drive circuit or a passive drive circuit.

[0102] The first light emitting unit is configured to emit visible light, the wavelength of which may be approximately in the range of 380 nm to 700 nm. Optionally, the first light emitting unit may emit white light, monochromatic light (light of a single color), or color-adjustable light.

[0103] In some embodiments of the present invention, each first light-emitting unit includes a first sub-light-emitting chip, a second sub-light-emitting chip, and a third sub-light-emitting chip. The first sub-light-emitting chip is configured to emit blue light; the second sub-light-emitting chip is configured to emit red light; and the third sub-light-emitting chip is configured to emit green light. In this case, by controlling the first, second, and third sub-light-emitting chips to emit light simultaneously, light from the first, second, and third sub-light-emitting chips can be mixed, resulting in the light emitted by the light-emitting substrate appearing white.

[0104] In some embodiments of the present invention, the light-emitting substrate can be used for illumination, i.e., in a lighting device, or for displaying images or pictures, i.e., in a display device. Furthermore, when each first light-emitting unit includes a first sub-light-emitting chip, a second sub-light-emitting chip, and a third sub-light-emitting chip, by controlling the brightness of each sub-light-emitting chip, the color and brightness of the mixed light emitted by the light-emitting substrate can be controlled, thereby achieving multi-color illumination.

[0105] The second light-emitting unit is used to emit ultraviolet light. When the light-emitting substrate is used in a display device, the ultraviolet light emitted by the second light-emitting unit can be used to disinfect the surface of the display image to remove dirt and bacteria. Alternatively, it can be used in conjunction with a photosensitive antibacterial layer, which not only can achieve sterilization and antibacterial effects on the surface of the display module, but also does not require the introduction of metal ions, will not be subject to certain restrictions in market access, and is not limited to use in specific environments with ultraviolet light, such as medical and outdoor environments, making it applicable to more fields. When the light-emitting substrate is used in a lighting device, the ultraviolet light emitted by the second light-emitting unit can be used to sterilize and disinfect various items.

[0106] The first light-emitting unit and the second light-emitting unit are both, for example, light-emitting diode chips, preferably micro light-emitting diodes (Mini□LED / Micro□LED) having the advantages of high brightness, high contrast, fast response and low power consumption.

[0107] When the light-emitting substrate is used in a display device, the control circuit can drive each first light-emitting unit and each second light-emitting unit to emit light individually, or can also drive each first light-emitting unit and each second light-emitting unit to emit light simultaneously. Preferably, considering the health of the user, it is recommended that when the user is not using the display device, each second light-emitting unit be driven to emit light individually to sterilize the surface of the display device displaying an image, and when the display device is in use, each first light-emitting unit be driven to emit light individually.

[0108] The light-emitting substrate may further include a drive circuit connected to each of the first light-emitting units and each of the second light-emitting units. The drive circuit may be connected to the control circuit to drive each of the first light-emitting units and each of the second light-emitting units to emit light according to an electrical signal input by the control circuit. The drive circuit may be an active drive circuit or a passive drive circuit.

[0109] The display device provided in the embodiment of the present invention can be a direct-lit display device or an edge-lit display device. Taking the direct-lit display device as an example, there can be multiple light-emitting unit groups, which are arranged on the side away from the light-emitting surface of the display module. By adopting multiple light-emitting unit groups arranged in an array, the uniformity of light emission of the entire backlight structure can be ensured. By providing at least one second light-emitting unit 3 in each light-emitting unit group, it can be ensured that different areas of the photosensitive antibacterial layer 10 can be irradiated by ultraviolet light, thereby ensuring that the entire display image surface of the display module can be sterilized. The structure and function of the first light-emitting unit and the second light-emitting unit in each light-emitting unit group have been described in detail in the above embodiment and will not be repeated here.

[0110] In the case where the display device is an edge-entry display device, the backlight source structure further includes a light guide plate, which is arranged on the side of the light-emitting surface away from the display module; a light-emitting unit group is provided on at least one side of the light guide plate. By providing a plurality of second light-emitting units on at least one side of the light guide plate, it can be used in conjunction with a photosensitive antibacterial layer, which not only can achieve sterilization and antibacterial effect on the surface of the display module, but also does not require the introduction of metal ions, and will not be subject to certain restrictions in market access. In addition, it is not limited to use in specific environments with ultraviolet light such as medical and outdoor environments, and can be applied to more fields.

[0111] It should be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and essence of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A display device, characterized in that: The device comprises a backlight structure, a display module and a photosensitive antibacterial layer, wherein the backlight structure comprises a light-emitting unit group, the light-emitting unit group comprises at least one first light-emitting unit and at least one second light-emitting unit, wherein the first light-emitting unit is used to emit visible light; and the second light-emitting unit is used to emit ultraviolet light; The photosensitive antibacterial layer is arranged on one side of the light emitting surface of the display module, and is used to achieve antibacterial effect under the catalytic effect of ultraviolet light.

2. The display device according to claim 1, characterized in that There are a plurality of first light emitting units in the light emitting unit group, and the plurality of first light emitting units are arranged at intervals; The second light emitting units are arranged at intervals on a line connecting any two of the first light emitting units.

3. The display device according to claim 2, characterized in that: Among the plurality of the first light-emitting units, two of the first light-emitting units on the line where the second light-emitting unit is located are respectively a first sub-light-emitting unit and a second sub-light-emitting unit; The distance between the first sub-light emitting unit and the second sub-light emitting unit is a first distance, and the minimum distance between two adjacent first light emitting units is a second distance; The first sub-light emitting unit and the second sub-light emitting unit are not adjacent to each other, and the first distance is greater than the second distance; or, the first sub-light emitting unit and the second sub-light emitting unit are adjacent to each other, and the first distance is equal to the second distance.

4. The display device according to claim 3, characterized in that: A plurality of the first light-emitting units are arranged to form a preset polygon; The number of the second light emitting unit is one and is located at the geometric center of the preset polygon, and the second light emitting unit is spaced apart from the first light emitting units arranged to form the preset polygon. The distances are equal.

5. The display device according to claim 4, characterized in that: There are four first light-emitting units, and the preset polygon formed by the arrangement includes a square; The second light emitting unit is located at the geometric center of the square, and is equidistant from the four first light emitting units.

6. The display device according to claim 4, characterized in that: There are three first light-emitting units, and the preset polygon formed by the arrangement includes an equilateral triangle; The second light-emitting unit is located at the geometric center of the equilateral triangle, and is equidistant from the three first light-emitting units respectively; There are multiple groups of light-emitting units, and the multiple groups of light-emitting unit groups are arranged in an array relative to the light-emitting surface of the display module; wherein every two groups of the light-emitting unit groups share two adjacent first light-emitting units, so that the two equilateral triangles formed by every two groups of the light-emitting unit groups share one side.

7. The display device according to claim 3, characterized in that: A plurality of the first light-emitting units are arranged to form a preset polygon; There are multiple second light emitting units located on each side of the preset polygon, and the distance between each second light emitting unit and two first light emitting units on the side is equal.

8. The display device according to claim 7, characterized in that: There are four first light-emitting units, and the preset polygon formed by the arrangement includes a square; There are four second light emitting units, which are respectively located on four sides of the square, and each of the second light emitting units is equidistant from two of the first light emitting units on the side where the second light emitting unit is located.

9. The display device according to claim 7 or 8, characterized in that: There is also one of the second light-emitting units or the first light-emitting unit located at the geometric center of the preset polygon, and the distances between the second light-emitting units or the first light-emitting units arranged to form the preset polygon are equal.

10. The display device according to any one of claims 3 to 8, characterized in that: The second distance is equal to 7.5 mm.

11. The display device according to claim 1, characterized in that: There are multiple groups of light-emitting units, and the multiple groups of light-emitting unit groups are arranged in an array relative to the light-emitting surface of the display module; each two adjacent groups of light-emitting unit groups share at least one of the first light-emitting units and / or at least one of the second light-emitting units adjacent to each other.

12. The display device according to claim 1, characterized in that: The backlight source structure further includes a light guide plate, which is arranged on a side of the light emitting surface away from the display module; The light emitting unit group is disposed on at least one side of the light guide plate, the light emitting unit group includes a plurality of the first light emitting units and a plurality of the second light emitting units, and the plurality of the first light emitting units and the plurality of the second light emitting units on the same side are arranged along the extension direction of the corresponding side of the light guide plate; The first light emitting units and the second light emitting units on the same side are arranged alternately.

13. The display device according to claim 1, characterized in that The backlight source structure further includes a light guide plate, which is arranged on a side of the light emitting surface away from the display module; The light emitting unit group includes a first sub-light emitting unit group and a second sub-light emitting unit group, wherein the first sub-light emitting unit group includes a plurality of the first light emitting units, and the second sub-light emitting unit group includes a plurality of the second light emitting units, wherein: A plurality of the first light emitting units are disposed on at least one side of the light guide plate, and the plurality of the first light emitting units on the same side are arranged along an extension direction of the corresponding side of the light guide plate; A plurality of the second light emitting units are disposed on at least one side of the light guide plate, and the plurality of the second light emitting units on the same side are arranged along an extension direction of the corresponding side of the light guide plate; The first light emitting unit and the second light emitting unit are located on different sides of the light guide plate.

14. The display device according to claim 1, characterized in that The first light emitting unit is used to emit monochromatic light; The display device further includes a light conversion layer, which is disposed on a side away from the light emitting surface of the display module and is used to convert the monochromatic light emitted by the first light emitting unit into white light.

15. The display device according to claim 1, characterized in that: The first light emitting unit is used to emit white light.

16. The display device according to claim 1, characterized in that: The first light-emitting unit includes a first sub-light-emitting chip, a second sub-light-emitting chip and a third sub-light-emitting chip, wherein the first sub-light-emitting chip is used to emit blue light; the second sub-light-emitting chip is used to emit red light; and the third sub-light-emitting chip is used to emit green light.

17. The display device according to claim 1, characterized in that: The display device further includes: A bandpass filter structure is disposed on a side of the photosensitive antibacterial layer away from the display panel; The bandpass filter structure includes a microstructure disposed on a surface of the photosensitive antibacterial layer facing away from the display panel.

18. The display device according to claim 17, characterized in that: The microstructure includes a photonic crystal structure, and the photonic crystal structure includes a plurality of protrusions arranged in an array on a surface of the photosensitive antibacterial layer on a side away from the display panel.

19. The display device according to claim 18, characterized in that The sum of the size of each protrusion in the first direction and the interval between each adjacent protrusion in the first direction is greater than or equal to 130nm and less than or equal to 160nm; the size of each protrusion in the first direction is greater than or equal to 74nm and less than or equal to 90nm; the height of each protrusion is greater than or equal to 100nm and less than or equal to 500nm; The first direction is a row direction or a column direction of an array in which the plurality of protrusions are arranged.

20. The display device according to claim 19, characterized in that The height of each protrusion is 100 nm; the sum of the size of each protrusion in the first direction and the interval between each adjacent protrusion in the first direction is 140 nm; and the size of each protrusion in the first direction is 80 nm.

21. The display device according to claim 1, characterized in that The photosensitive antibacterial layer has an antibacterial nanostructure.

Images