Display device and method of operating the same

Abstract

The invention discloses a display device and a method of operating the same. The display device comprises a night vision mode and a normal mode, and the display device comprises a plurality of visible light display units and a plurality of invisible light display units. The method comprises the steps that in a night vision mode, the invisible light display unit is driven, and the visible light display unit is turned off; in the normal mode, the visible light display unit is driven, and the invisible light display unit is turned off.

Description

Technical Field

[0001] The present invention relates to a display device and a method for operating the display device, and in particular to a display device including an invisible light display unit and a method for operating the display device. Background Art

[0002] As the technology of display devices evolves, their uses are becoming more and more extensive. However, existing display devices can only display visible light images that can be seen by the naked eye. In order to make the display device have an anti-peeping effect, currently only by narrowing the viewing angle of the display device to prevent non-users from viewing private information, it is impossible to have complete privacy. Alternatively, in a dark environment, the generated visible light will cause light pollution, thereby exposing the user's position, making it impossible for the user to view the image information while maintaining privacy. Summary of the invention

[0003] An object of the present invention is to provide a display device and a method for operating the display device.

[0004] According to one embodiment, the present invention provides a method for operating a display device, wherein the display device includes a night vision mode and a normal mode, and the display device includes a plurality of visible light display units and a plurality of invisible light display units. The method includes driving the invisible light display unit and turning off the visible light display unit in the night vision mode; and driving the visible light display unit and turning off the invisible light display unit in the normal mode.

[0005] According to another embodiment, the present invention provides a display device, including a substrate, a plurality of visible light display units, and a plurality of invisible light display units. The visible light display unit and the invisible light display unit are arranged on the substrate, the visible light display unit is used to display a visible light image, and the invisible light display unit is used to display an invisible light image. The display device has a display area, and the visible light display unit and the invisible light display unit are arranged in the display area. The display device includes a night vision mode and a normal mode, wherein in the night vision mode, the invisible light display unit displays an invisible light image, and the visible light display unit is in an off state, wherein in the normal mode, the visible light display unit displays a visible light image, and the invisible light display unit is in an off state. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 FIG. 1 is a schematic top view of a display device according to a first embodiment of the present invention.

[0007] Figure 2 Shown Figure 1 Schematic cross-sectional views along the section line AA', the section line BB', the section line CC' and the section line DD'.

[0008] Figure 3 FIG. 1 is a schematic diagram showing the emission spectra of a first light emitting element, a second light emitting element, a third light emitting element and a fourth light emitting element and the transmission spectrum of a filter layer according to an embodiment of the present invention.

[0009] Figure 4 It is a schematic diagram showing the relationship between chip size and external quantum efficiency when the first light-emitting element, the second light-emitting element and the third light-emitting element are light-emitting diode chips.

[0010] Figure 5 The display device of the second embodiment of the present invention corresponds to Figure 1 A schematic cross-sectional view of the portion of section lines AA', BB', CC' and DD'.

[0011] Figure 6 FIG. 4 is a schematic top view of a display device according to a third embodiment of the present invention.

[0012] Figure 7 Shown Figure 6 Schematic cross-sectional views along the section line EE', the section line FF', the section line GG' and the section line HH'.

[0013] Figure 8 FIG. 4 is a schematic top view of a display device according to a fourth embodiment of the present invention.

[0014] Fig. 9 Shown Figure 8 Schematic cross-sectional views along section lines II', JJ', KK' and LL'.

[0015] Fig.10 The display device of the fifth embodiment of the present invention corresponds to Figure 8 A schematic cross-sectional view of the portion of section lines II', JJ', KK' and LL'.

[0016] Fig.11 FIG. 4 is a schematic top view of a display device according to a sixth embodiment of the present invention.

[0017] Fig.12 FIG. 4 is a schematic diagram showing a normal mode and a night vision mode of a display device according to an embodiment of the present invention.

[0018] Fig.13 FIG. 4 is a schematic diagram showing a privacy mode of a display device according to an embodiment of the present invention.

[0019] Explanation of reference numerals: 1, 2, 3, 4, 5, 6 - display device; 100 - night vision goggles; 12, 32 - substrate; 14 - visible light display unit; 141 - first visible light display unit; 141a - first light-emitting element; 141b - first color filter layer; 142 - second visible light display unit; 142a - second light-emitting element; 142b - second color filter layer; 143 - third visible light display unit; 143a - third light-emitting element; 143b - third color filter layer; 16 - invisible light display unit; 16a - fourth light-emitting element; 16b - filter layer; 18, 22, 34 - insulating layer; 18a, 18b, 18c , 18d, 20a, 20b, 20c, 20d, 34a, 34b, 34c, 34d-opening; 20-light shielding layer; 24-packaging layer; 26-protective layer; 281-first wavelength conversion layer; 282-second wavelength conversion layer; 283-third wavelength conversion layer; 30-light scattering layer; 30a-first light scattering layer; 30b-second light scattering layer; 30c-third light scattering layer; C1, C2, C3, C4, C6, C7, C8, C5-curve; DR-display area; L1, L2, L3, L4-light; P1, P3-visible light image; P2, P4-invisible light image; PX-pixel; TD-direction. DETAILED DESCRIPTION

[0020] The content of the present invention is described in detail below in conjunction with specific embodiments and drawings. In order to make the content of the present invention clearer and easier to understand, the following drawings may be simplified schematic diagrams, and the elements therein may not be drawn to scale. Moreover, the number and size of each element in the drawings are only for illustration and are not intended to limit the scope of the present invention.

[0021] Certain words are used throughout the present specification and the appended claims to refer to specific components. Those skilled in the art will understand that electronic equipment manufacturers may refer to the same components by different names, and this document does not intend to distinguish between components that have the same function but different names. In the present specification and claims, the words "including" and "comprising" are open-ended words and should be interpreted as "including but not limited to...".

[0022] The ordinal numbers used in the specification and claims of the present invention, such as "first", "second", etc., to modify the elements of the claims, do not themselves mean or represent any previous ordinal numbers of the claimed elements, nor do they represent the order of one claimed element and another claimed element, or the order in the manufacturing method. The use of the ordinal numbers is only used to clearly distinguish a claimed element with a certain name from another claimed element with the same name.

[0023] In addition, when an element or a film layer is referred to as being electrically connected to another element or another film layer, it should be understood that the element or film layer is directly electrically connected to the other element or film layer, or the two may be electrically connected through other elements or film layers (indirectly). But on the contrary, when an element or a film layer is referred to as being "directly electrically connected to" another element or film layer, it should be understood that the two are not electrically connected through other elements or film layers. In addition, the terms "electrically connected" or "coupled" include any direct and indirect electrical connection means.

[0024] In the text, the terms "about", "substantially", "roughly" or "the same" generally indicate a range within 20%, within 10%, within 5%, within 3%, within 2%, within 1%, or within 0.5% of a given value. The quantities given here are approximate quantities, that is, in the absence of specific description of "about", "substantially", "roughly" or "the same", the meaning of "about", "substantially", "roughly" or "the same" can still be implied.

[0025] It should be understood that the following embodiments may replace, reorganize, or mix features in multiple different embodiments to complete other embodiments without departing from the spirit of the present invention. Features between embodiments may be mixed and matched as long as they do not violate the spirit of the invention or conflict with each other.

[0026] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It is understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the background or context of the relevant technology and the present invention, and should not be interpreted in an idealized or overly formal manner unless specifically defined in the embodiments of the present invention.

[0027] The display device of the present invention can be applied to, for example, notebook computers, public displays, spliced ​​displays, automotive displays, touch displays, televisions, monitors, smart phones, tablet computers, light source modules, lighting equipment, military equipment, or electronic devices applied to the above products, but not limited thereto. The display device may, for example, include light emitting diodes, fluorescent materials, phosphorescent materials, other suitable display media, or a combination of the foregoing, but not limited thereto. The light emitting diode may, for example, include an organic light emitting diode (OLED), a sub-millimeter light emitting diode (mini LED), a micro-millimeter light emitting diode (micro LED) or a quantum dot light emitting diode (quantum dot, QD, which may be, for example, QLED, QDLED) or any combination of the foregoing materials, but not limited thereto. The display device may, for example, include a spliced ​​display device, but not limited thereto. In addition, the appearance of the display device may, for example, be rectangular, circular, polygonal, a shape with curved edges, a curved surface (curved) or other suitable shapes. The display device may have peripheral systems such as a drive system, a control system, a light source system, a shelf system, etc. The display device may include an electronic unit, wherein the electronic unit may include passive components and active components, such as capacitors, resistors, inductors, diodes, transistors, sensors, etc.

[0028] Please refer to Figure 1 and Figure 2 , Figure 1 FIG. 1 is a schematic top view of a display device according to a first embodiment of the present invention, and Figure 2 Shown Figure 1 Schematic cross-sectional view along the section line A-A', section line B-B', section line CC' and section line D-D'. Figure 1 and Figure 2 As shown, the display device 1 may include a substrate 12, a plurality of visible light display units 14, and a plurality of invisible light display units 16, wherein the visible light display units 14 and the invisible light display units 16 are disposed on the substrate 12, the visible light display units 14 may be used to display visible light images, and the invisible light display units 16 may be used to display invisible light images. For example, the display device 1 may have a display area DR for displaying images, and the visible light display units 14 and the invisible light display units 16 may be respectively disposed or distributed in the display area DR of the display device 1.

[0029] Specifically, the display device 1 may include a night vision mode and a normal mode, wherein in the night vision mode, the invisible light display unit 16 displays an invisible light image, and the visible light display unit 14 is in an off state, while in the normal mode, the visible light display unit 14 displays a visible light image, and the invisible light display unit 16 is in an off state. Since the display device 1 displays an invisible light image in the night vision mode, bystanders who are not using the display device 1 will not find that the display device 1 is operating or displaying an image, so that the display device 1 can be private. In a dark environment, the invisible light image generated by the display device 1 will not generate light pollution, thereby not exposing the user's position, so the user can view the image information while maintaining privacy. In the present invention, when the display device displays an invisible light image, the user needs to wear a device that can view the invisible light image, such as night vision goggles (for example, Fig.12 or Fig.13 Night vision goggles 100 as shown) or other suitable devices.

[0030] like Figure 1 and Figure 2 As shown, the visible light display unit 12 may include, for example, a first visible light display unit 141, a second visible light display unit 142, and a third visible light display unit 143, which are respectively used to generate light of different colors, such as light L1, light L2, and light L3. The peak wavelength of the light L1 of the first visible light display unit 141 may be greater than the peak wavelength of the light L2 of the second visible light display unit 142, and the peak wavelength of the light L2 of the second visible light display unit 142 may be greater than the peak wavelength of the light L3 of the third visible light display unit 143. For example, the light L1, the light L2, and the light L3 may respectively generate red light, green light, and blue light, or other suitable color combinations of light, but the present invention is not limited thereto.

[0031] In addition, the invisible light display unit 16 can be used to generate invisible light L4, such as infrared light or other suitable invisible light. Moreover, the peak wavelength of the light L4 of the invisible light display unit 16 is greater than the peak wavelength of the light (e.g., light L1, light L2, and light L3) of the visible light display unit 14. The peak wavelength range of the light L4 can be, for example, from 800 nanometers (nm) to 1500 nanometers.

[0032] In addition, the first visible light display unit 141, the second visible light display unit 142 and the third visible light display unit 143 can form a pixel PX, but are not limited thereto. The number of the first visible light display unit 141, the second visible light display unit 142 and the third visible light display unit 143 can be, for example, multiple, respectively, to form multiple pixels PX. Figure 1In the embodiment of the present invention, one of the invisible light display units 16 may correspond to one pixel PX and be disposed adjacent to the corresponding pixel PX, so that the distribution density of the pixel PX may be equal to the distribution density of the invisible light display unit 16, but the invention is not limited thereto. In some embodiments, one invisible light display unit 16 may correspond to a plurality of pixels PX, that is, the distribution density of the pixel PX may be greater than the distribution density of the invisible light display unit 16, for example Fig.11 As shown, but not limited to. Figure 1 In the pixel PX, the first visible light display unit 141, the second visible light display unit 142, the third visible light display unit 143 and the corresponding invisible light display unit 16 can be arranged in an array, but is not limited thereto. In some embodiments, the arrangement of the first visible light display unit 141, the second visible light display unit 142, the third visible light display unit 143 and the corresponding invisible light display unit 16 can be adjusted according to needs.

[0033] like Figure 2 As shown, the first visible light display unit 141 may include a first light emitting element 141a, the second visible light display unit 142 may include a second light emitting element 142a, the third visible light display unit 143 may include a third light emitting element 143a, and one of the invisible light display units 16 may include a fourth light emitting element 16a. Figure 2 In the embodiment of the present invention, the first light-emitting element 141a, the second light-emitting element 142a and the third light-emitting element 143a can generate light of different colors, wherein the peak wavelength of the light generated by the fourth light-emitting element 16a can be greater than the peak wavelength of the light generated by the first light-emitting element 141a, the peak wavelength of the light generated by the first light-emitting element 141a can be greater than the peak wavelength of the light generated by the second light-emitting element 142a, and the peak wavelength of the light generated by the second light-emitting element 142a can be greater than the peak wavelength of the light generated by the third light-emitting element 143a. For example, the colors of the light generated by the first light-emitting element 141a, the second light-emitting element 142a and the third light-emitting element 143a can be close to or the same as the colors of the light L1, the light L2 and the light L3 finally emitted from the display device 1, such as red light, green light and blue light, but not limited thereto. The light generated by the fourth light-emitting element 16a can be the same as or similar to the light L4 of the invisible light display unit 16, such as infrared light or other suitable invisible light. The peak wavelength of the light emitted by the fourth light emitting element 16 a may range from 800 nanometers to 1500 nanometers, for example.

[0034] Please refer to Figure 3 , which is a schematic diagram of the light emission spectra of the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element and the transmission spectrum of the filter layer according to an embodiment of the present invention. Figure 3As shown, curves C1, C2, C3 and C4 can represent the emission spectra of the first light emitting element 141a, the second light emitting element 142a, the third light emitting element 143a and the fourth light emitting element 16a respectively, but are not limited thereto. The light spectrum is represented by the coordinates on the left side to indicate the normalized light intensity. Figure 3 It can be seen that the first light emitting element 141a, the second light emitting element 142a and the third light emitting element 143a can generate light of different colors, but the light emission spectrum of the light emitting element of the present invention is not Figure 3 For the limit.

[0035] exist Figure 2 In the embodiment of the present invention, the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a may include, for example, organic light-emitting diodes or light-emitting diode chips, respectively, but are not limited thereto. The light-emitting diode chip may include, for example, a sub-millimeter light-emitting diode (mini LED), a micro-millimeter light-emitting diode (micro LED) or a light-emitting diode of other suitable size. In order to generate light with different colors, the materials of the light-emitting diode chips of the light-emitting elements may be different, so that the external quantum efficiency (EQE) (that is, the efficiency of converting electrical energy into light energy) of one of the light-emitting elements of the visible light display unit 14 may be different from the external quantum efficiency of the light-emitting element of another of the visible light display unit 14, and / or the external quantum efficiency of the light-emitting element of one of the invisible light display units 16 may be different from the external quantum efficiency of the light-emitting element of one of the visible light display units 14. In this embodiment, the chip size of the light-emitting element of one of the visible light display units 14 may be different from the area of ​​the light-emitting element of another of the visible light display units 14, and / or the area of ​​the light-emitting element of one of the visible light display units 14 may be different from the area of ​​the light-emitting element of one of the invisible light display units 16, so as to improve the overall external quantum efficiency of the display device 1, thereby reducing power loss. In this article, the "area" refers to the light-emitting area of ​​the corresponding element viewed along the direction TD perpendicular to the upper surface of the substrate 12, for example, the area of ​​the light-emitting element, the visible light display unit 14 or the invisible light display unit 16 refers to the light-emitting area viewed along the direction TD.

[0036] For example, the material of the LED chips of the first light-emitting element 141a and the fourth light-emitting element 16a may be different from the material of the LED chips of the second light-emitting element 142a and the third light-emitting element 143a. The materials of the LED chips of the first light-emitting element 141a and the fourth light-emitting element 16a may include, for example, indium gallium arsenide phosphide (InGaAsP) or aluminum gallium indium phosphide (AlGaInP), respectively. The materials of the LED chips of the second light-emitting element 142a and the third light-emitting element 143a may include, for example, indium gallium nitride (InGaN) or gallium nitride (GaN), respectively. In this case, the external quantum efficiency of the first light-emitting element 141a and / or the fourth light-emitting element 16a may be lower than the external quantum efficiency of the second light-emitting element 142a and / or the third light-emitting element 143a.

[0037] For example, see Figure 4 , which is a schematic diagram showing the relationship between chip size and external quantum efficiency when the first light-emitting element, the second light-emitting element and the third light-emitting element are light-emitting diode chips. Figure 2 and Figure 4 As shown, when the peak wavelength relationship of the light generated by the first light emitting element 141a, the second light emitting element 142a and the third light emitting element 143a is as described above, curves C6, C7 and C8 can respectively represent the relationship between the chip size and external quantum efficiency of the first light emitting element 141a, the second light emitting element 142a and the third light emitting element 143a. Figure 4 It can be seen that when the first light-emitting element 141a, the second light-emitting element 142a and the third light-emitting element 143a have the same chip size, the external quantum efficiency of the first light-emitting element 141a is lower than the external quantum efficiency of the second light-emitting element 142a and the external quantum efficiency of the third light-emitting element 143a. In particular, when the chip size of the first light-emitting element 141a is less than 20 microns, its external quantum efficiency is significantly lower. Figure 4 In the figure, the chip size may refer to, for example, the length of the diagonal of the light-emitting diode chip in a top view, and thus may represent the light-emitting area of ​​the light-emitting diode chip, but is not limited thereto. In the present embodiment, the area of ​​the first light-emitting element 141a may be larger than the area of ​​the second light-emitting element 142a and the area of ​​the third light-emitting element 143a to improve the external quantum efficiency of the first light-emitting element 141a, thereby reducing the overall power loss, or when the first light-emitting element 141a needs to have a smaller chip size, it may help to improve the manufacturing yield of the first light-emitting element 141a. In some embodiments, the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a may respectively include other types of light-emitting elements, such as organic light-emitting diodes, quantum dot light-emitting diodes or other suitable elements.

[0038] In some embodiments, the area of ​​the fourth light-emitting element 16a may be larger than the area of ​​the second light-emitting element 142a and the area of ​​the third light-emitting element 143a to improve the external quantum efficiency of the fourth light-emitting element 16a, thereby reducing the overall power loss, or may help improve the manufacturing yield of the fourth light-emitting element 16a.

[0039] like Figure 2 As shown, the first visible light display unit 141 may also include a first color filter layer 141b, which is disposed on the first light-emitting element 141a, the second visible light display unit 142 may include a second color filter layer 142b, which is disposed on the second light-emitting element 142a, the third visible light display unit 143 may include a third color filter layer 143b, which is disposed on the third light-emitting element 143a, and one of the invisible light display units 16 includes a filter layer 16b, which is disposed on the fourth light-emitting element 16a. The first color filter layer 141b, the second color filter layer 142b, the third color filter layer 143b and the filter layer 16b may have different transmission spectra, so that the light with different peak wavelengths generated by the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a can pass through the first color filter layer 141b, the second color filter layer 142b, the third color filter layer 143b and the filter layer 16b respectively.

[0040] like Figure 3 As shown, according to the emission spectra of the first light emitting element 141a, the second light emitting element 142a and the third light emitting element 143a, the corresponding transmission spectra of the first color filter layer 141b, the second color filter layer 142b and the third color filter layer 143b can be designed. In addition, curve C5 represents the transmission spectrum of the filter layer 16b, wherein the transmission spectrum is represented by the coordinates on the right side. Figure 3 In the embodiment of the present invention, the filter layer 16b can filter out the visible light of the first light emitting element 141a, the second light emitting element 142a and the third light emitting element 143a, and allow the invisible light of the fourth light emitting element 16a to pass. The arrangement of the color filter layer and the filter layer can help reduce the brightness of the ambient light reflected from the corresponding visible light display unit 14 or the invisible light display unit 16, thereby improving the contrast of the display device 1 in the presence of ambient light, for example, improving the ambient contrast ratio (ACR).

[0041] like Figure 2As shown, the display device 1 may further include an insulating layer 18 and a light shielding layer 20, which are sequentially arranged on the substrate 12. The insulating layer 18 may be, for example, a pixel defining layer (PDL). The insulating layer 18 may include, for example, a photoresist material, an ink material, or other suitable materials. The insulating layer 18 may be, for example, white, gray, or black. The light shielding layer 20 may be, for example, black, and the light shielding layer 20 may include, for example, a photoresist material, an ink material, or other suitable materials. In some embodiments, the display device 1 may not include the light shielding layer 20, but stack different color filter layers to form a light shielding structure. The insulating layer 18 may have an opening 18a, an opening 18b, an opening 18c, and an opening 18d, so that grooves may be formed with the substrate 12 respectively. At least one first light emitting element 141a may be arranged in each opening 18a, at least one second light emitting element 142a may be arranged in each opening 18b, at least one third light emitting element 143a may be arranged in each opening 18c, and at least one fourth light emitting element 16a may be arranged in each opening 18d. The sizes of the opening 18a, the opening 18b, the opening 18c and the opening 18d can be adjusted according to the sizes of the corresponding light emitting elements. In the present embodiment, since the area of ​​the first light emitting element 141a and / or the area of ​​the fourth light emitting element 16a can be larger than the area of ​​the second light emitting element 142a and / or the area of ​​the third light emitting element 143a, when viewed along the direction TD, the area of ​​the opening 18a and / or the area of ​​the opening 18d can be larger than the area of ​​the opening 18b and / or the area of ​​the opening 18c.

[0042] In addition, the light shielding layer 20 may have an opening 20a, an opening 20b, an opening 20c and an opening 20d, which respectively correspond to the opening 18a, the opening 18b, the opening 18c and the opening 18d of the insulating layer 18. The first color filter layer 141b, the second color filter layer 142b, the third color filter layer 143b and the filter layer 16b may be respectively disposed in the opening 20a, the opening 20b, the opening 20c and the opening 20d. In the present embodiment, the areas of the opening 20a, the opening 20b, the opening 20c and the opening 20d are adjusted according to the areas of the opening 18a, the opening 18b, the opening 18c and the opening 18d for disposing the light emitting element, so that the area of ​​the opening 20a and / or the area of ​​the opening 20d may be larger than the area of ​​the opening 20b and / or the area of ​​the opening 20c. Moreover, the areas of the first visible light display unit 141, the second visible light display unit 142, the third visible light display unit 143 and the invisible light display unit 16 can be determined by the areas of the opening 20a, the opening 20b, the opening 20c and the opening 20d, respectively. Therefore, through the above configuration, the purpose of making the area of ​​the first visible light display unit 141 and / or the area of ​​the invisible light display unit 16 larger than the area of ​​the second visible light display unit 142 and / or the area of ​​the third visible light display unit 143 can be achieved.

[0043] exist Figure 2 In the embodiment of the present invention, the display device 1 may include an insulating layer 22 disposed in the opening 18a, the opening 18b, the opening 18c and the opening 18d. The insulating layer 22 may cover the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a. The upper surface of the insulating layer 22 may be flush with the upper surface of the insulating layer 18, but is not limited thereto. The insulating layer 22 may, for example, include an organic material, which may be cured by illumination or heating to help fix the light-emitting element on the substrate 12, but is not limited thereto. In some embodiments, an adhesive layer may be further disposed between the insulating layer 18 and the light-shielding layer 20. The adhesive layer may, for example, include an optically transparent adhesive (OCR / OCA).

[0044] In addition, the display device 1 may further include an encapsulation layer 24, which is disposed on the light shielding layer 20, the first color filter layer 141b, the second color filter layer 142b, the third color filter layer 143b and the filter layer 16b. The encapsulation layer 24 may, for example, include a single layer or multiple layers of inorganic material layers or an alternating stack of at least one inorganic material layer and at least one organic material layer to reduce the penetration of water vapor or oxygen. For example, the inorganic material layer may include silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide or other suitable materials, or any combination of the above inorganic materials, but is not limited thereto. The organic material layer may include resin, but is not limited thereto.

[0045] In the present embodiment, the substrate 12 may include a substrate material and an active element formed on the substrate material. The first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a may be controlled by corresponding active elements. For example, the substrate material may include a flexible substrate material or a rigid substrate material, such as polyimide (PI), polyethylene terephthalate (PET), polycarbonate (PC), polyethersulfone (PES), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), polyarylate (PAR), acrylic, glass, quartz, sapphire, other appropriate materials or combinations thereof, but not limited thereto. The active element may include, for example, a thin film transistor, but not limited thereto. In some embodiments, the encapsulation layer 24 may include the substrate material exemplified above.

[0046] In some embodiments, the encapsulation layer 24 of the display device 1 can be replaced by another substrate. In this case, the light shielding layer 20, the first color filter layer 141b, the second color filter layer 142b, the third color filter layer 143b and the filter layer 16b can be first formed on the other substrate and bonded to the insulating layer 18 and the insulating layer 22 through an adhesive layer, but is not limited to this.

[0047] The display device of the present invention is not limited to the above-mentioned embodiment, and may have different embodiments. To simplify the description, the other embodiments below will use the same reference numerals as the first embodiment to mark the same elements. To facilitate the comparison of the differences between the first embodiment and other embodiments, the differences between the first embodiment and other embodiments will be highlighted below, and the repeated parts will not be repeated.

[0048] Please refer to Figure 5 , which shows the display device of the second embodiment of the present invention corresponding to Figure 1 A schematic cross-sectional view of the section line A-A', section line B-B', section line CC' and section line D-D'. Figure 5 As shown, the display device 2 provided in this embodiment may further include a protective layer 26 disposed on the first light emitting element 141a, the second light emitting element 142a, the third light emitting element 143a and the fourth light emitting element 16a. Figure 5 In the embodiment of the present invention, the display device 2 may selectively not include Figure 1 The insulating layer 22, the light shielding layer 20, the color filter layer, the filter layer 16b and the encapsulation layer 24 shown in the figure allow the protective layer 26 to be directly disposed in the openings 18a, 18b, 18c and 18d of the insulating layer 18, thereby protecting the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a. In this case, the protective layer 26 may, for example, include a gray or black material, which may, for example, include adding carbon black, titanium dioxide (TiO2) or a combination thereof to an organic material, so that the protective layer 26 may also have the function of reducing the visibility of the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a. The material of the protective layer 26 may, for example, include a photoresist material, silica gel, epoxy resin glue or other suitable materials. In addition, Figure 5 Other parts of the display device 2 may be the same as or similar to the display device in the above embodiment, and thus will not be described in detail.

[0049] Please refer to Figure 6 and Figure 7 , Figure 6 FIG. 1 is a schematic top view of a display device according to a third embodiment of the present invention, and Figure 7 Shown Figure 6 Schematic cross-sectional view along the section line E-E', section line F-F', section line G-G' and section line H-H'. Figure 6 and Figure 7As shown, in the display device 3 provided in this embodiment, the first light emitting element 141a, the second light emitting element 142a, the third light emitting element 143a and the fourth light emitting element 16a can be identical to each other and can generate the same light spectrum, that is, can generate light of the same color, such as blue light, ultraviolet light or other suitable light. Figure 7 In the embodiment of, the light generated by the third light-emitting element 143a can be used as the light L3 emitted by the third visible light display unit 143. In this case, the first visible light display unit 141 may further include a first wavelength conversion layer 281, which is disposed on the first light-emitting element 141a and is used to convert the light of the first light-emitting element 141a into the light L1 emitted by the first visible light display unit 141. The second visible light display unit 142 may further include a second wavelength conversion layer 282, which is disposed on the second light-emitting element 142a and is used to convert the light of the second light-emitting element 142a into the light L2 emitted by the second visible light display unit 142. The invisible light display unit 16 may further include a third wavelength conversion layer 283, which is disposed on the fourth light-emitting element 16a and is used to convert the light of the fourth light-emitting element 16a into the invisible light L4 emitted by the invisible light display unit 16. Therefore, the first wavelength conversion layer 281, the second wavelength conversion layer 282 and the third wavelength conversion layer 283 can be used to generate light with different peak wavelengths, respectively. Furthermore, the third visible light display unit 143 may selectively include a light scattering layer 30 disposed on the third light emitting element 143a to scatter the light of the third light emitting element 143a to increase the emission angle of the light L3. The present invention is not limited thereto.

[0050] In some embodiments, when the color of the light generated by the third light-emitting element 143a is different from the color of the light L3 emitted by the third visible light display unit 143, the third visible light display unit 143 may selectively include a fourth wavelength conversion layer, which is disposed on the third light-emitting element 143a and is used to convert the light of the third light-emitting element 143a into the light L3 emitted by the third visible light display unit 143.

[0051] It should be noted that since the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a can generate light of the same color, for example, they are all the same light-emitting diode chip, when the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a are arranged in the openings 18a, 18b, 18c and 18d, there is no need to perform multiple mass transfer processes for light-emitting elements of different colors, thereby simplifying the process steps and reducing the difficulty of the process.

[0052] In order to make different wavelength conversion layers, such as the first wavelength conversion layer 281, the second wavelength conversion layer 282 and the third wavelength conversion layer 283, generate light L1, light L2 and light L4 with different peak wavelengths, the first wavelength conversion layer 281, the second wavelength conversion layer 282 and the third wavelength conversion layer 283 may respectively include different wavelength conversion particles, for example, quantum dot particles of different sizes or different materials or other suitable wavelength conversion materials. In some embodiments, at least one of the first wavelength conversion layer 281, the second wavelength conversion layer 282 and the third wavelength conversion layer 283 may selectively include scattering particles, which are arranged therein to improve the light conversion efficiency of the wavelength conversion layer. In some embodiments, when the third visible light display unit 143 includes a fourth wavelength conversion layer, the fourth wavelength conversion layer may, for example, include quantum dot particles or other suitable wavelength conversion materials. The fourth wavelength conversion layer may also selectively include scattering particles, but is not limited thereto.

[0053] In some embodiments, taking the wavelength conversion layer including quantum dot particles as an example, the conversion efficiency of the quantum dot particles used to generate the light L2 may be lower than that of the quantum dot particles used to generate the light L1 and the quantum dot particles used to generate the light L4. In order to improve the light conversion efficiency of the second wavelength conversion layer 282, the area of ​​the second wavelength conversion layer 282 may be larger than the area of ​​the first wavelength conversion layer 281 and the area of ​​the third wavelength conversion layer 283, so that the area of ​​the second visible light display unit 142 may be larger than the area of ​​the first visible light display unit 141 and the area of ​​the invisible light display unit 16, thereby increasing the brightness of the light L2.

[0054] In addition, the area of ​​the first wavelength conversion layer 281 and the area of ​​the second wavelength conversion layer 282 may be larger than the area of ​​the light scattering layer 30 (or the fourth wavelength conversion layer) to improve the light conversion efficiency of the first wavelength conversion layer 281 and the second wavelength conversion layer 282, thereby improving the brightness of the light L1 and the light L2. In other words, the area of ​​the first visible light display unit 141 and the area of ​​the second visible light display unit 142 may be larger than the area of ​​the third visible light display unit 143. By increasing the area of ​​the second wavelength conversion layer 282 and the area of ​​the first wavelength conversion layer 281, the brightness of the light L2 and the brightness of the light L1 can match the brightness of the light L3 of the third visible light display unit 143. In some embodiments, since the light L4 does not need to match the light L3, the area of ​​the third wavelength conversion layer 283 can be adjusted according to actual needs, so that the area of ​​the invisible light display unit 16 can be greater than, equal to, or less than the area of ​​the third visible light display unit 143.

[0055] In some embodiments, the light scattering layer 30 may include, for example, a polymer layer and light scattering particles disposed in the polymer layer. The light scattering particles may include, for example, titanium dioxide, boron nitride (BN), or other particle materials having a different refractive index from the polymer layer, but are not limited thereto. The polymer layer may include, for example, a scattering material. In some embodiments, Figure 6 Other parts of the display device 3 may be the same as or similar to the display device 1 of the above embodiment, and thus will not be described in detail.

[0056] exist Figure 7 In the embodiment of the present invention, the display device 3 may include a substrate 32, which is disposed on the light shielding layer 20 and the filter layer (for example, the first color filter layer 141b, the second color filter layer 142b, the third color filter layer 143b and the filter layer 16b). In this case, the light shielding layer 20, the filter layer and the wavelength conversion layer may be first formed on the substrate 32, and then the wavelength conversion layer and the insulating layer 22 may be attached by an adhesive layer (not shown), but the present invention is not limited thereto. In some embodiments, the substrate 32 may be replaced by Figure 1 The packaging layer 24 shown, and the wavelength conversion layer, the filter layer and the light shielding layer 20 can be first formed on the insulating layer 22 , and then the packaging layer 24 is formed on the filter layer and the light shielding layer 20 .

[0057] exist Figure 7 In the embodiment, the display device 3 may further selectively include an insulating layer 34 for separating the first wavelength conversion layer 281, the second wavelength conversion layer 282, the third wavelength conversion layer 283 and the light scattering layer 30 (or the fourth wavelength conversion layer). The insulating layer 34 may have openings 34a, 34b, 34c and 34d, which are respectively used to set the first wavelength conversion layer 281, the second wavelength conversion layer 282, the third wavelength conversion layer 283 and the light scattering layer 30. Figure 7 In the embodiment, the sizes of the opening 34a, the opening 34b, the opening 34c and the opening 34d may be respectively the same as the sizes of the opening 20a, the opening 20b, the opening 20c and the opening 20d, so that the sizes of the first wavelength conversion layer 281, the second wavelength conversion layer 282, the third wavelength conversion layer 283 and the light scattering layer 30 may be the same as the sizes of the first color filter layer 141b, the second color filter layer 142b, the third color filter layer 143b and the filter layer 16b, but are not limited thereto. In some embodiments, the sizes of the opening 34a, the opening 34b, the opening 34c and the opening 34d may be respectively different from the sizes of the opening 20a, the opening 20b, the opening 20c and the opening 20d. In addition, Figure 6 and Figure 7 Other parts of the display device 3 may be the same as or similar to the display device in the above embodiment, and thus will not be described in detail.

[0058] It is worth noting that in Figure 7 In the embodiment, the first color filter layer 141b, the second color filter layer 142b and the filter layer 16b can be respectively disposed on the first wavelength conversion layer 281, the second wavelength conversion layer 282 and the third wavelength conversion layer 283. When the first wavelength conversion layer 281, the second wavelength conversion layer 282 and the third wavelength conversion layer 283 do not absorb all the light generated by the corresponding light emitting element, the first color filter layer 141b, the second color filter layer 142b and the filter layer 16b can be used to filter out the light generated by the light emitting element to prevent the colors of the light L1, the light L2 and the light L4 from being affected by the light.

[0059] Please refer to Figure 8 and Fig. 9 , Figure 8 FIG. 1 is a schematic top view of a display device according to a fourth embodiment of the present invention, and Fig. 9 Shown Figure 8 Schematic cross-sectional view along section line II', section line JJ', section line KK' and section line LL'. Figure 8 and Fig. 9 As shown, in the display device 4 provided in this embodiment, the first light-emitting element 141a, the second light-emitting element 142a and the third light-emitting element 143a can generate light of different colors, and the fourth light-emitting element 16a can be the same as one of the first light-emitting element 141a, the second light-emitting element 142a and the third light-emitting element 143a. In this case, the invisible light display unit 16 further includes a third wavelength conversion layer 283, which is disposed on the fourth light-emitting element 16a, and is used to convert the visible light generated by the fourth light-emitting element 16a into invisible light L4. The structure of the third wavelength conversion layer 283 can be the same as Figure 7 The third wavelength conversion layer 283 is not described in detail here. Fig. 9 In the embodiment of the present invention, the fourth light emitting element 16a and the second light emitting element 142a may be identical to each other and thus may generate light of the same color, but the present invention is not limited thereto.

[0060] The first light emitting element 141a, the second light emitting element 142a and the third light emitting element 143a of the present embodiment may be respectively the same as Figure 2The first light emitting element 141a, the second light emitting element 142a and the third light emitting element 143a are not described in detail here. In some embodiments, the first visible light display unit 141 may further selectively include a first light scattering layer 30a disposed on the first light emitting element 141a, the second visible light display unit 142 may further selectively include a second light scattering layer 30b disposed on the second light emitting element 142a, and the third visible light display unit 143 may further selectively include a third light scattering layer 30c disposed on the third light emitting element 143a. By disposing the first light scattering layer 30a, the second light scattering layer 30b and the third light scattering layer 30c, the light L1 generated by the first visible light display unit 141, the light L2 generated by the second visible light display unit 142 and the light L3 generated by the third visible light display unit 143 may have a larger exit angle, thereby improving the viewing angle of the display device 4. In some embodiments, the first light scattering layer 30a, the second light scattering layer 30b and the third light scattering layer 30c can be formed by the same light scattering layer, but are not limited thereto. The structures of the first light scattering layer 30a, the second light scattering layer 30b and the third light scattering layer 30c can refer to Figure 7 The light scattering layer 30 is not described in detail here.

[0061] exist Figure 8 In the embodiment of the present invention, the area of ​​the first light emitting element 141a can be larger than the area of ​​the second light emitting element 142a and the area of ​​the third light emitting element 143a, so as to improve the external quantum efficiency of the first light emitting element 141a, thereby reducing the overall power loss, or when the first light emitting element 141a needs to have a smaller chip size, it can help to improve the manufacturing yield of the first light emitting element 141a. Therefore, the area of ​​the first visible light display unit 141 can be larger than the area of ​​the second visible light display unit 142 and the area of ​​the third visible light display unit 143.

[0062] It should be noted that, since the external quantum efficiency of the second light-emitting element 142a is greater than the external quantum efficiency of the first light-emitting element 141a, the selection of the fourth light-emitting element 16a to be the same as the second light-emitting element 142a can help improve the external quantum efficiency of the fourth light-emitting element 16a. In this case, the area of ​​the first light-emitting element 141a can be greater than the area of ​​the fourth light-emitting element 16a, so that the area of ​​the first visible light display unit 141 can be greater than the area of ​​the invisible light display unit 16. In addition, compared with the peak wavelength of the light generated by the third light-emitting element 143a, the difference between the peak wavelength of the light generated by the second light-emitting element 142a and the peak wavelength of the light L4 is smaller, so the energy loss of the third wavelength conversion layer 283 converting the light of the fourth light-emitting element 16a into the light L4 can be reduced. In some embodiments, the fourth light-emitting element 16a may also be the same as the first light-emitting element 141a or the same as the third light-emitting element 143a. Since the fourth light-emitting element 16a is the same as one of the first light-emitting element 141a, the second light-emitting element 142a, and the third light-emitting element 143a, the number of mass transfer processes can be reduced when the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a, and the fourth light-emitting element 16a are disposed in the openings 18a, 18b, 18c, and 18d, thereby simplifying the process steps. Figure 8 and Fig. 9 Other parts of the display device 4 may be the same as or similar to the display device of the above embodiment, and thus will not be described in detail.

[0063] Please refer to Fig.10 , which shows the display device corresponding to the fifth embodiment of the present invention Figure 8 The schematic cross-sectional view of the section line I-I', section line J-J', section line K-K' and section line L-L'. Fig.10 As shown, in the display device 5 provided in the present embodiment, the first light-emitting element 141a is identical to one of the second light-emitting element 142a and the third light-emitting element 143a, and is used to generate light of the same color, and the fourth light-emitting element 16a may be identical to one of the first light-emitting element 141a, the second light-emitting element 142a and the third light-emitting element 143a, and is used to generate another light of the same color. In this case, the first visible light display unit 141 also includes a first wavelength conversion layer 281, which is disposed on the first light-emitting element 141a, and is used to convert the light of the first light-emitting element 141a into light L1. In addition, the invisible light display unit 16 also includes a third wavelength conversion layer 283, which is disposed on the fourth light-emitting element 16a, and is used to convert the visible light generated by the fourth light-emitting element 16a into invisible light L4. The first light-emitting element 141a and the first wavelength conversion layer 281 of the present embodiment may be identical or similar Figure 7The first light emitting element 141a and the first wavelength conversion layer 281 are described in detail herein.

[0064] exist Fig.10 In the embodiment of the present invention, the fourth light-emitting element 16a may be identical to the second light-emitting element 142a to generate light of the same color. It should be noted that the external quantum efficiency of the second light-emitting element 142a may be greater than the external quantum efficiency of the light-emitting element that generates red light, and therefore the external quantum efficiency of the fourth light-emitting element 16a may be greater than the external quantum efficiency of the light-emitting element that generates red light, thereby reducing the overall power loss of the display device 5. Moreover, compared to the peak wavelength of the light generated by the third light-emitting element 143a, the difference between the peak wavelength of the light generated by the second light-emitting element 142a and the peak wavelength of the light L4 is smaller, thereby reducing the energy loss of the third wavelength conversion layer 283 converting the light of the fourth light-emitting element 16a into the light L4. In some embodiments, the fourth light-emitting element 16a may also be identical to the third light-emitting element 143a. By making the fourth light-emitting element 16a the same as one of the second light-emitting element 142a and the third light-emitting element 143a, the number of mass transfer processes can be reduced when the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a are arranged in the openings 18a, 18b, 18c and 18d, thereby simplifying the process steps.

[0065] It should be noted that, since the first light-emitting element 141a of the present embodiment can be the same as the third light-emitting element 143a, the external quantum efficiency of the first light-emitting element 141a can be improved compared to the first light-emitting element that generates red light. Moreover, when the first light-emitting element 141a, the second light-emitting element 142a, the third light-emitting element 143a and the fourth light-emitting element 16a are disposed in the openings 18a, 18b, 18c and 18d, the number of mass transfer processes can be reduced to simplify the process steps. In addition, Fig.10 Other parts of the display device 5 may be the same as or similar to the display device in the above embodiment, and thus will not be described in detail.

[0066] Please refer to Fig.11 , which is a top view schematic diagram of a display device according to a sixth embodiment of the present invention. Fig.11 As shown, in the display device 6 of this embodiment, the distribution density of the pixels PX may be greater than the distribution density of the invisible light display unit 16. Figure 6In a pixel PX, the first visible light display unit 141, the second visible light display unit 142 and the third visible light display unit 143 may be arranged in the same direction, but are not limited thereto. In other words, the visible light image displayed by the display device 6 of this embodiment may have a higher resolution than the invisible light image. By reducing the distribution density of the invisible light display unit 16, the opening of the light shielding layer 20 corresponding to the invisible light display unit 16 (for example, Figure 2 , Figure 7 , Fig. 9 and Fig.10 The area of ​​the opening 20d) shown can be reduced, thereby reducing the reflectivity of the display device 6 to ambient light.

[0067] The following will further explain how to operate the display device. Fig.12 , and also refer to Figure 1 . Fig.12 FIG. 2 is a schematic diagram of a normal mode and a night vision mode of a display device according to an embodiment of the present invention. Figure 1 and Fig.12 As shown, the method for operating the display device provided in this embodiment may include driving the visible light display unit 14 and turning off the invisible light display unit 16 in the normal mode, and driving the invisible light display unit 16 and turning off the visible light display unit 14 in the night vision mode. Figure 1 The display device 1 shown is described as an example, but is not limited thereto. In some embodiments, the method for operating a display device herein can also be applied to the display devices of other embodiments described above.

[0068] like Figure 1 and Fig.12As shown, in the night vision mode, the invisible light display unit 16 displays the invisible light image P2, and the visible light display unit 14 is in the off state, so the display device 1 does not generate visible light in the night vision mode. In this way, bystanders who are not using the display device 1 will not find that the display device 1 is operating or displaying an image, so that the display device 1 can be confidential. In a dark environment, the invisible light image P2 generated by the display device 1 will not generate light pollution, thereby not exposing the user's position, so the user can view the image information while maintaining confidentiality. In the present invention, when the display device 1 displays the invisible light image, the user needs to wear a device that can view the invisible light image P2, such as night vision goggles 100 or other suitable devices. In the normal mode, the visible light display unit 14 displays the visible light image P1, and the invisible light display unit 16 is in the off state, so the display device 1 can display a general visible image in the normal mode. Taking military applications as an example, the display device 1 can operate in a normal mode during the day to display a visible light image P1 , and in a night vision mode at night to display an invisible light image P2 , thereby avoiding exposing the user's position.

[0069] In some embodiments, Figure 1 and Fig.12 As shown, the display device 1 may also include a hybrid mode. In the hybrid mode, the visible light display unit 14 is driven, and the invisible light display unit 16 is driven, so that the display device 1 can simultaneously display the visible light image P1 and the invisible light image P2. In the hybrid mode, the visible light display unit 14 can display a first content, the invisible light display unit 16 can display a second content, and the first content can be the same as the second content. For example, the display device 1 may have a signal input source, which is electrically connected to the visible light display unit 14 and the invisible light display unit 16, and is used to provide the same content to the visible light display unit 14 and the invisible light display unit 16, so that the first content of the visible light image P1 can be the same as the second content of the invisible light image P2, but is not limited thereto. The first content and the second content may, for example, include patterns, grayscales, or other content signals. Taking military applications as an example, when conducting a briefing at night, since it is inconvenient to put on and take off the night vision goggles 100, the display device 1 simultaneously displays the visible light image P1 and the invisible light image P2, which can help viewers who are not wearing night vision goggles 100 and viewers who are wearing night vision goggles 100 to view the same content at the same time.

[0070] Please refer to Fig.13 , which is a schematic diagram of a privacy mode of a display device according to an embodiment of the present invention. Fig.13As shown, the display device provided in this embodiment may further include a privacy mode, and the method of operating the display device may further include, in the privacy mode, driving the visible light display unit 14 to display a first content, driving the invisible light display unit 16 to display a second content, and the first content is different from the second content. Figure 1 The display device 1 shown is described as an example, but is not limited thereto. In some embodiments, the method of operating a display device herein may also be applied to the display devices of other embodiments described above. For example, the display device 1 may have two signal input sources, which are electrically connected to the visible light display unit 14 and the invisible light display unit 16, respectively, so that the two signal input sources can provide independent and different content to the visible light display unit 14 and the invisible light display unit 16, respectively, so that the first content of the visible light image P3 may be different from the second content of the invisible light image P4, but is not limited thereto. The first content and the second content may, for example, include patterns, grayscales, or other content signals. Taking military applications as an example, by simultaneously displaying different first content and second content on the display device 1, the information viewed by viewers wearing night vision goggles 100 and viewers not wearing night vision goggles 100 can be distinguished, for example, the first content of visible light is not private, but the second content of invisible light is private, and only viewers wearing night vision goggles 100 are allowed to view it. In some embodiments, the size of the first content may be selectively different from the size of the second content.

[0071] In summary, in the display device of the present invention, since it includes a visible light display unit and an invisible light display unit, it can display visible light images and invisible light images simultaneously or not simultaneously, so the display device can have a normal mode, a night mode, a mixed mode, and a stealth mode. In the method of operating the display device of the present invention, since the displayed invisible light image needs to be used with a specific viewing device, bystanders who are not using the display device will not find that the display device is operating or displaying an image, so that the display device can be private. In a dark environment, the invisible light image generated by the display device will not generate light pollution, thereby not exposing the user's position, so the user can view the image information while maintaining privacy.

[0072] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for operating a display device, characterized in that: The display device includes a night vision mode and a normal mode, the display device includes a plurality of visible light display units and a plurality of invisible light display units, and the method includes: In the normal mode, the plurality of visible light display units are driven, and the plurality of invisible light display units are turned off; and In the night vision mode, the plurality of invisible light display units are driven, and the plurality of visible light display units are turned off.

2. The method for operating a display device according to claim 1, wherein: The display device further includes a mixed mode, and the method further includes driving the plurality of visible light display units and driving the plurality of invisible light display units in the mixed mode.

3. The method for operating a display device according to claim 2, wherein: In the mixed mode, the plurality of visible light display units display a first content, the plurality of invisible light display units display a second content, and the first content is the same as the second content.

4. The method for operating a display device according to claim 1, wherein: The display device also includes a stealth mode, and the method also includes, in the stealth mode, driving the plurality of visible light display units to display a first content, driving the plurality of invisible light display units to display a second content, and the first content is different from the second content.

5. A display device, characterized in that: include: a substrate; A plurality of visible light display units are disposed on the substrate, and the plurality of visible light display units are used to display a visible light image; as well as A plurality of invisible light display units are disposed on the substrate, and the plurality of invisible light display units are used to display an invisible light image, wherein the display device has a display area, the plurality of visible light display units and the plurality of invisible light display units are disposed in the display area, and the display device includes a night vision mode and a normal mode, In the night vision mode, the plurality of invisible light display units display the invisible light image, and the plurality of visible light display units are in a closed state. In the normal mode, the plurality of visible light display units display the visible light image, and the plurality of invisible light display units are in a closed state.

6. The display device according to claim 5, characterized in that The multiple visible light display units include a first visible light display unit, a second visible light display unit and a third visible light display unit, which are respectively used to generate light of different colors. The first visible light display unit includes a first light-emitting element, the second visible light display unit includes a second light-emitting element, the third visible light display unit includes a third light-emitting element, and one of the multiple invisible light display units includes a fourth light-emitting element.

7. The display device according to claim 6, wherein: The first light emitting element, the second light emitting element and the third light emitting element generate light of different colors.

8. The display device according to claim 7, characterized in that The peak wavelength of the light generated by the first light-emitting element is greater than the peak wavelength of the light generated by the second light-emitting element and the peak wavelength of the light generated by the third light-emitting element, and the area of ​​the first light-emitting element is greater than the area of ​​the second light-emitting element and the area of ​​the third light-emitting element.

9. The display device according to claim 7, wherein: The peak wavelength of the light generated by the fourth light-emitting element is greater than the peak wavelength of the light generated by the second light-emitting element and the peak wavelength of the light generated by the third light-emitting element, and the area of ​​the fourth light-emitting element is greater than the area of ​​the second light-emitting element and the area of ​​the third light-emitting element.

10. The display device according to claim 6, wherein: The first visible light display unit also includes a first color filter disposed on the first light-emitting element, the second visible light display unit also includes a second color filter layer disposed on the second light-emitting element, the third visible light display unit also includes a third color filter layer disposed on the third light-emitting element, and one of the multiple invisible light display units also includes a filter layer disposed on the fourth light-emitting element, wherein the first color filter layer, the second color filter layer, the third color filter layer and the filter layer have different transmission spectra.

11. The display device according to claim 6, wherein: The invention also comprises a protection layer, which is disposed on the first light-emitting element, the second light-emitting element, the third light-emitting element and the fourth light-emitting element.

12. The display device according to claim 6, wherein: The first light-emitting element, the second light-emitting element, the third light-emitting element and the fourth light-emitting element are identical to each other. The first visible light display unit also includes a first wavelength conversion layer disposed on the first light-emitting element. The second visible light display unit also includes a second wavelength conversion layer disposed on the second light-emitting element. One of the multiple invisible light display units also includes a third wavelength conversion layer disposed on the fourth light-emitting element. The first wavelength conversion layer, the second wavelength conversion layer and the third wavelength conversion layer are respectively used to generate light with different peak wavelengths.

13. The display device according to claim 12, wherein: The peak wavelength of the light generated by the first visible light display unit is greater than the peak wavelength of the light generated by the second visible light display unit, the peak wavelength of the light generated by the second visible light display unit is greater than the peak wavelength of the light generated by the third visible light display unit, and the area of ​​the second visible light display unit is greater than the area of ​​the first visible light display unit.

14. The display device according to claim 13, wherein: The area of ​​the first visible light display unit is greater than the area of ​​the third visible light display unit.

15. The display device according to claim 6, wherein: The first light-emitting element, the second light-emitting element and the third light-emitting element respectively generate light of different colors, the fourth light-emitting element is the same as one of the first light-emitting element, the second light-emitting element and the third light-emitting element, and one of the multiple invisible light display units also includes a third wavelength conversion layer disposed on the fourth light-emitting element.

16. The display device according to claim 15, characterized in that The peak wavelength of the light generated by the first visible light display unit is greater than the peak wavelength of the light generated by the second visible light display unit, the peak wavelength of the light generated by the second visible light display unit is greater than the peak wavelength of the light generated by the third visible light display unit, and the fourth light-emitting element is identical to the second light-emitting element.

17. The display device according to claim 15, characterized in that: The peak wavelength of the light generated by the first visible light display unit is greater than the peak wavelength of the light generated by the second visible light display unit, the peak wavelength of the light generated by the second visible light display unit is greater than the peak wavelength of the light generated by the third visible light display unit, and the area of ​​the first visible light display unit is greater than the area of ​​one of the multiple invisible light display units.

18. The display device according to claim 6, wherein: The first light-emitting element is identical to one of the second light-emitting element and the third light-emitting element, the fourth light-emitting element is identical to another of the second light-emitting element and the third light-emitting element, the first visible light display unit also includes a first wavelength conversion layer disposed on the first light-emitting element, and one of the multiple invisible light display units also includes a third wavelength conversion layer disposed on the fourth light-emitting element.

19. The display device according to claim 18, wherein: The peak wavelength of the light generated by the first light-emitting element is greater than the peak wavelength of the light generated by the second light-emitting element, the peak wavelength of the light generated by the second light-emitting element is greater than the peak wavelength of the light generated by the third light-emitting element, and the fourth light-emitting element is the same as the second light-emitting element.

20. The display device according to claim 5, characterized in that The plurality of visible light display units form a plurality of pixels, and a distribution density of the plurality of pixels is greater than or equal to a distribution density of the plurality of invisible light display units.

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