Display device having multiple sub-pixels

A display device including a first sub-pixel and a second sub-pixel is provided. The first sub-pixel includes a first light emitting unit and a first wavelength conversion layer disposed thereon. The first sub-pixel provides a first light emitted from the first light emitting unit and converted by the first wavelength conversion layer. The first light includes a first main-peak and a first sub-peak. The second sub-pixel includes a second light emitting unit and a second wavelength conversion layer disposed thereon. The second sub-pixel provides a second light emitted from the second light emitting unit and converted by the second wavelength conversion layer. The second light includes a second main-peak and a second sub-peak. A first wavelength difference between the first main-peak and the second main-peak is less than 20 nm, and the first wavelength difference is less than a second wavelength difference between the first sub-peak and the second sub-peak.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the priority benefit of China application serial no. 201910638195.5, filed on Jul. 16, 2019. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.

BACKGROUND

Technical Field

The disclosure relates to an electronic device, and more particularly to a display device.

Description of Related Art

The recognition of color difference of different colors by the human eyes is different due to differences in colors. For example, blue color difference is easier to be perceived by the human eyes than red color difference and green color difference. A display device may use three primary colors of light for light mixing to provide a display screen. When there is a color difference perceivable by the human eyes between different sub-pixels of the same color (such as different blue sub-pixels) in the display device, the visual effect (display quality) of the display device will be affected.

SUMMARY

The disclosure provides a display device having good display quality.

According to the embodiments of the disclosure, the display device comprises a first sub-pixel and a second sub-pixel. The first sub-pixel comprises a first light emitting unit and a first wavelength conversion layer disposed thereon. The first sub-pixel provides a first light emitted from the first light emitting unit and converted by the first wavelength conversion layer. The first light comprises a first main-peak and a first sub-peak. The second sub-pixel comprises a second light emitting unit and a second wavelength conversion layer disposed thereon. The second sub-pixel provides a second light emitted from the second light emitting unit and converted by the second wavelength conversion layer. The second light includes a second main-peak and a second sub-peak. A first wavelength difference between the first main-peak and the second main-peak is less than 20 nanometers (nm). The first wavelength difference is less than a second wavelength difference between the first sub-peak and the second sub-peak.

To make the aforementioned and other features of the disclosure more comprehensible, several embodiments accompanied with drawings are described in detail as follows.

DETAILED DESCRIPTION OF DISCLOSED EMBODIMENTS

The disclosure may be understood by referring to the following detailed descriptions in conjunction with the accompanying drawings. It should be noted that in order for the reader to understand easily and for the simplicity of the drawings, multiple drawings in the disclosure only illustrate a portion of the electronic device and specific elements in the drawings are not drawn to scale. In addition, the number and size of each element in the drawings are only for illustration and are not intended to limit the scope of the disclosure.

Certain terms are used throughout the disclosure and the appended claims to refer to specific elements. Persons skilled in the art should understand that electronic equipment manufacturers may refer to the same elements using different names. The disclosure is not intended to distinguish between the elements with the same function but different names. In the following specification and claims, words such as “having” and “including” are open-ended words, which should be interpreted as the meaning of “including but not limited to . . . ”.

Directional terms such as “up”, “down”, “front”, “rear”, “left”, “right”, etc., as mentioned in the disclosure only refer to directions with reference to the drawings. Therefore, the directional terms are only for illustration and are not intended to limit the disclosure. In the drawings, the drawings illustrate general characteristics of methods, structures, and/or materials used in specific embodiments. However, the drawings should not be construed to define or limit the scope or nature covered by the embodiments. For example, for clarity, the relative size, thickness, and location of each film layer, region, and/or structure may be reduced or enlarged.

It should be understood that when an element or film layer is referred to as being configured “on” or “connected” to another element or film layer, the former may be directly on or directly connected to the other element or film layer or there may be an intervening element or film layer between the two (indirect case). In contrast, when an element is referred to as being “directly on” or “directly connected” to another element or film layer, there is no intervening element or film layer between the two.

The term “approximately”, “equal to”, “equal”, or “same” typically represents falling within a 20% range of a given value or range, or represents falling within a 10%, 5%, 3%, 2%, 1%, or 0.5% range of a given value or range.

In the disclosure, the same or similar elements will be given the same or similar reference numerals, and detailed descriptions thereof will be omitted. In addition, as long as the features in different embodiments do not violate the spirit of the disclosure and are not mutually conflicting, they may be mixed and used arbitrarily. Also, all simple equivalent changes and modifications made according to the specification or claims fall within the scope of the disclosure. In addition, terms such as “first”, “second”, etc. mentioned in the specification or claims are only used to name discrete elements or to distinguish different embodiments or ranges, but not to limit the upper limit or lower limit of the number of elements and the manufacturing sequence or configurational sequence of the elements.

The electronic device of the disclosure may include a display device, an antenna device, a sensing device, a light emitting device or a splicing device, but is not limited thereto. The electronic device may include a bendable or flexible electronic device. The electronic device may include, for example, a liquid crystal layer or a light emitting diode (LED). The LED may include, for example, an organic light emitting diode (OLED), a mini LED, a micro LED, or a quantum dot LED (abbreviated as QLED or QDLED), fluorescence, phosphor, other suitable materials or a combination thereof, but is not limited thereto. A display device is used as the electronic device in the following to explain the content of the disclosure, but it is not limited thereto.

FIG. 1is a front view of a display device1according to the first embodiment of the disclosure. Referring toFIG. 1, the display device1includes a plurality of pixels PU. The pixel PU may be composed of a plurality of sub-pixels P. The sub-pixels P may be arranged in an array to provide a display screen. For example, the pixels PU may include at least one red sub-pixel PR, at least one green sub-pixel PG, and at least one blue sub-pixel PB, but is not limited thereto. However, the color types of the plurality of sub-pixels P may be changed according to requirements. For example, the sub-pixels P may include sub-pixels with other colors, such as a white sub-pixel (not shown) or a yellow sub-pixel (not shown), but is not limited thereto.

InFIG. 1, the plurality of sub-pixels with the same color are arranged along, a first direction D1, but are not limited thereto. In the drawing, the sub-pixels showing the same bottom pattern are the sub-pixels with the same color. The sub-pixels with different colors (the red sub-pixel PR, the green sub-pixel PG, and the blue sub-pixel PB) are sequentially arranged along a second direction D2, but are not limited thereto. In some embodiments, the first direction D1is different from the second direction D2. In some embodiments, the first direction D1may be substantially perpendicular to the second direction D2, that is, an actuate angle θ between the first direction D1and the second direction D2is about 80 degrees to 90 degrees (80 degrees≤θ≤90 degrees). However, the arrangement of the sub-pixels P, the composition of the pixels PU, and/or the actuate angle θ between the first direction D1and the second direction D2may be changed according to requirements, and are not limited to as shown inFIG. 1.

FIG. 2is a partial cross-sectional view of the display device1inFIG. 1corresponding to a cross-sectional line I-I′. InFIG. 1andFIG. 2, for simplicity of explanation, only a first sub-pixel P1and a second sub-pixel P2are described. However, the method for reducing the visibility of color difference (to be described later) of the disclosure may be applied to more than two sub-pixels with the same color. InFIG. 1andFIG. 2, the first sub-pixel P1and the second sub-pixel P2are exemplified using the blue sub-pixel PB, but the disclosure is not limited to reduce the visibility of the blue color difference. For example, the method for reducing the visibility of color difference may reduce the visibility of color difference for the sub-pixels with any color of the plurality of sub-pixels.

FIG. 1andFIG. 2schematically illustrate a case where there is a color difference between at least two sub-pixels (including the first sub-pixel P1and the second sub-pixel P2) with the same color in different display modules. Specifically, the display device1includes a first display module10and a second display module12tiled with the first display module10, wherein the first sub-pixel P1is in the first display module10, and the second sub-pixel P2is in the second display module12, but are not limited thereto. In another embodiment, the first sub-pixel and the second sub-pixel may be two sub-pixels (the first sub-pixel P1and a second sub-pixel P2′ as shown inFIG. 1) with the same color at different locations in the same display module. In other words, the method for reducing the visibility of color difference may be used to reduce the visibility of at least two sub-pixels with the same color in different display modules, or to reduce the visibility of at least two sub-pixels with the same color in the same display module. The following embodiments may all be improved accordingly, which will not be reiterated hereafter.

Referring toFIG. 1toFIG. 3, the first sub-pixel P1includes a first light emitting unit PB11-1and a first wavelength conversion layer P12disposed thereon. The first sub-pixel P1is for providing a first light B1emitted from the first light emitting unit PB11-1and is converted by the wavelength conversion layer P12. The second sub-pixel P2includes a second light emitting unit PB11-2and a second wavelength conversion layer P22disposed thereon. The second sub-pixel P2is for providing a second light B2emitted from the second light emitting unit PB11-2and is converted by the second wavelength conversion layer P22.

In detail, the first light emitting unit PB11-1provides a first excitation light (not shown). The first wavelength conversion layer P12converts the first excitation light into a first converted light (not shown). Finally, the first light B1provided by the first sub-pixel P1may include the first converted light and the unconverted first excitation light. Similarly, the second light emitting unit P21provides a second excitation light (not shown). The second wavelength conversion layer P22converts the second excitation light into a second converted light (not shown). Finally, the second light B2provided by the second sub-pixel P2may include the second converted light and the unconverted second excitation light. In the embodiment (FIG. 1andFIG. 3), the first sub-pixel P1and the second sub-pixel P2are the blue sub-pixels PB. Therefore, the first light B1and the second light B2are blue light, but are not limited thereto. In other embodiments (not shown), the first sub-pixel P1and the second sub-pixel P2are sub-pixels with other colors (such as the red sub-pixels PR, the green sub-pixels PG or sub-pixels of other suitable colors), and the first sub-pixel P1and the second sub-pixel P2need to have substantially the same color.

In some embodiments, the wavelength conversion layer may cover the light emitting unit. In some embodiments, the wavelength conversion layer may or may not contact the light emitting unit. In some embodiments, other film layer and/or element may be disposed between the wavelength conversion layer and the light emitting unit. In some embodiments (refer toFIG. 8), the wavelength conversion layer (such as the first wavelength conversion layer P12or the second wavelength conversion layer P22) and the corresponding light emitting unit (such as the first light emitting unit PB11-1or the second light emitting unit PB11-2) may be respectively disposed on the same or different substrates (such as an array substrate100and a substrate200). For details, refer to the descriptions ofFIG. 8in the following.

In some embodiments, the first light emitting unit P11and/or the second light emitting unit P21may include a LED, an OLED, a micro LED, a mini LED or a quantum dot LED (abbreviated as QLED or QD-LED).

In some embodiments, the wavelength conversion layer (such as the first wavelength conversion layer P12and the second wavelength conversion layer P22) may include a single layer or multilayer structure. In some embodiments, the wavelength conversion layer includes an active layer. The material of the active layer may include fluorescence, phosphor, quantum dot (QD), other suitable materials or at least a combination thereof. In some embodiments, the active layer may be excited by a short-wavelength light (or short-wavelength light beam) and convert the short-wavelength light (or short-wavelength light beam) into a long-wavelength light (or long-wavelength light beam), but is not limited thereto. In some embodiments, the first wavelength conversion layer P12and/or the second wavelength conversion layer P22include at least one protective layer (not shown inFIG. 1toFIG. 3) and/or at least one filter layer (not shown inFIG. 1toFIG. 3). In other words, the first wavelength conversion layer P12and/or the second wavelength conversion layer P22may include a stacked layer of an active layer, at least one protective layer and/or at least one filter layer.

FIG. 3is a spectrum diagram of the first light B1and the second light B2inFIG. 2. InFIG. 3, the thick solid lines and the thin solid lines schematically represent the spectrums of the first light B1and the second light B2respectively. Referring toFIG. 2andFIG. 3, the first light B1includes a first main-peak MP1and a first sub-peak SP1. The first main-peak MP1is substantially the first converted light converted by the first wavelength conversion layer P12from a portion of the first excitation light emitted by the first light emitting unit PB11-1, and the first sub-peak SP1is substantially a portion of the first excitation light not converted by the first wavelength conversion layer P12, but are not limited thereto. The first wavelength conversion layer P12is excited by the first excitation light (for example, the short-wavelength light), and the first excitation light be converted into the first converted light (the long-wavelength light). Therefore, a wavelength λMP1of the first main-peak MP1is greater than a wavelength λSP1of the first sub-peak SP1.

Similarly, the second light B2includes a second main-peak MP2and a second sub-peak SP2. The second main-peak MP2is substantially the second converted light converted by the second wavelength conversion layer P22from a portion of the second excitation light emitted by the second light emitting unit PB11-2, and the second sub-peak SP2is substantially a portion of the second excitation light not be converted by the second wavelength conversion layer P22. The second wavelength conversion layer P22is excited by the second excitation light (the short-wavelength light), and the second excitation light be converted into the second converted light (the long-wavelength light). Therefore, a wavelength λMP2of the second main-peak MP2is greater than a wavelength λSP2of the second sub-peak SP2.

It should be noted that, the spectrum of the first light B1includes the first main-peak MP1and the first sub-peak SP1, and the first main-peak MP1may have the wavelength λMP1. In other words, the wavelength λMP1may be the wavelength corresponding to the maximum light intensity in the spectrum of the first light B1. The spectrum of the second light B2comprises the second main-peak MP2and the second sub-peak SP2, and the second main-peak MP2may have the wavelength λMP2. In other words, the wavelength λMP2is the wavelength corresponding to the maximum light intensity in the spectrum of the second light B2. In addition, the first sub-peak SP1may have the wavelength λSP1, and the second sub-peak SP2may have the wavelength λSP2.

In addition, in some embodiments, when the first light B1and the second light B2are blue light, the wavelengths of the first sub-peak SP1and the second sub-peak SP2may be in a range of 390 nm to 460 nm (390 nm≤SP1(SP2)≤460 nm), or the first sub-peak SP1and the second sub-peak SP2are in a range of 400 nm to 450 nm (400 nm≤SP1(SP2)≤450 nm), but are not limited thereto. The wavelengths of the first main-peak MP1and the second main-peak MP2may be in a range of 460 nm to 470 nm (460 nm≤MP1(MP2)≤470 nm), but are not limited thereto.

In some embodiments, when the first light and the second light are red light, the wavelengths of the first sub-peak and the second sub-peak may be in a range of 390 nm to 460 nm (390 nm≤SP1(SP2)≤460 nm), for example, the wavelengths of the first sub-peak and the second sub-peak may be in a range of 400 nm to 450 nm (400 nm≤SP1(SP2)≤450 nm), but are not limited thereto. The wavelengths of the first main-peak and the second main-peak may be in a range of 600 nm to 700 nm (600 nm≤MP1(MP2)≤700 nm), but are not limited thereto.

In some embodiments, when the first light and the second light are green light, the wavelengths of the first sub-peak and the second sub-peak may be in a range of 390 nm to 460 nm (390 nm≤SP1(SP2)≤460 nm), for example, the wavelengths of the first sub-peak and the second sub-peak may be in a range of 400 nm to 450 nm (400 nm≤SP1(SP2)≤450 nm), but are not limited thereto. The wavelengths of the first main-peak and the second main-peak may be in a range of 500 nm to 600 nm (500 nm≤MP1(MP2)≤600 nm), but are not limited thereto.

In some embodiments, as shown inFIG. 3, there is a first wavelength difference W1(that is, the difference between the wavelength λMP1and the wavelength λMP2) between the first main-peak MP1and the second main-peak MP2, and there is a second wavelength difference W2(that is, the difference between the wavelength λSP1and the wavelength λSP2) between the first sub-peak SP1and the second sub-peak SP2, wherein the first wavelength difference W1is less than 20 nm and the first wavelength difference W1is less than the second wavelength difference W2between the first sub-peak SP1and the second sub-peak SP2. In other words, the first wavelength difference W1being less than the second wavelength difference W2means that the color difference between the first converted light and the second converted light formed by color-conversion is less than the color difference between the first excitation light and the second excitation light before color-conversion. By disposing the wavelength conversion layer, the color difference (wavelength difference) between at least two (or more) sub-pixels in the sub-pixels with the same color may be reduced, or to increase the display quality. In an embodiment, the first wavelength difference W1may be greater than or equal to 0 nm and less than or equal to 2 nm (0 nm≤first wavelength difference W1≤2 nm), making it difficult for the human eyes to detect the color difference. In addition, in some embodiments, a ratio of the first wavelength difference W1to the second wavelength difference W2may be in a range of 0.2 to 0.8 (0.2≤W1/W2≤0.8).

In addition, by disposing the wavelength conversion layer, a short-wavelength (wavelength in a range of 400 nm to 450 nm) excitation light may be converted into a long-wavelength (wavelength in a range of 460 nm to 470 nm) converted light that meets the international color gamut standard BT.2020 (also referred to as Rec. 2020) published by the International Telecommunication Union Radiocommunication Sector (ITU-R), but is not limited thereto. In addition, compared with blue light having a wavelength in a range of 400 nm to 450 nm, blue light having a wavelength in a range of 460 nm to 470 nm is less likely to harm the eyes, or to increase the comfort of the viewer when viewing the display screen. In an embodiment, a filter layer (not shown inFIG. 1toFIG. 3, the method of configuring the filter layer will be described in detail in the following) may be configured to absorb at least a portion of the excitation light for reducing the light intensity of the first sub-peak SP1and the light intensity of the second sub-peak SP2inFIG. 3, or to improve the display quality.

Please refer toFIG. 1andFIG. 2, the red sub-pixel PR may include a light emitting unit PR11, and the light emitting unit PR11may emit red light (not shown), the green sub-pixel PG may include a light emitting unit PG11, and the light emitting unit PG11may emit green light (not shown), and the blue sub-pixel PB may include light emitting units (for example, a first light emitting unit PB11-1and a second light emitting unit PB11-2) and the light emitting units (for example, the first light emitting unit PPB11-1and the second light emitting unit PB11-2) may emit blue light (not shown). In the embodiment ofFIG. 1toFIG. 3, the first sub-pixel P1and the second sub-pixel P2are the blue sub-pixels PB, but are not limited thereto. In addition, the red sub-pixel PR, the green sub-pixel PG, and/or the other blue sub-pixel PB may selectively include or not include the wavelength conversion layer. The material of the wavelength conversion layer will be adjusted according to the sub-pixel of the corresponding color.

According to different requirements, the display device1may comprise at least one display module. For example, the display device1may include a first display module10and a second display module12. The first display module10and the second display module12may respectively include an array substrate100, a plurality of light emitting units PR11emitting red light, a plurality of light emitting units PG11emitting green light, and/or a plurality of light emitting units (the first light emitting unit PB11-1and/or the second light emitting unit PB11-2) emitting blue light. The light emitting unit PR11, the light emitting unit PG11and/or the light emitting unit (the first light emitting unit PB11-1and/or the second light emitting unit PB11-2) are disposed on the array substrate100. In some embodiments, the array substrate100may include a substrate (not shown), and an active element array (not shown) and peripheral circuits (not shown) disposed on the substrate. However, for the drawings to be clearer, the array substrate100is illustrated as flat. References may be made to the prior art for the relevant descriptions of the active element array substrate, which will not be further limited/described here.

In some embodiments (as shown inFIG. 2), the display device1may include a first light shielding structure102. The first light shielding structure102is, disposed on the array substrate100. In some embodiments (as shown inFIG. 2), the first light shielding structure102is adjacent to or surrounding the first light emitting unit PB11-1and the second light emitting unit PB11-2. In detail, viewing in a normal direction Z (that is, the top view direction of the display device1) of the array substrate100, the shape of the first light shielding structure102may be in a grid shape, and the first light shielding structure102is adjacent to or surrounds the plurality of light emitting units (including the light emitting unit PR11, the light emitting unit PG11, the first light emitting unit PB11-1, and/or the second light emitting unit PB11-2). In some embodiments, the material of the first light shielding structure102may include an opaque material, a light absorbing material, a light reflecting material or a combination thereof, but is not limited thereto. In some embodiments, the first light shielding structure102includes a black resin and/or a metal material, but is not limited thereto. The first light shielding structure102is used as a black matrix (BM).

FIG. 4toFIG. 10are partial cross-sectional views of display devices2to8according to the second embodiment to the eighth embodiment of the disclosure. Referring toFIG. 4, the main differences between the display device2and the display device1inFIG. 2are described in the following. In the display device2, a wavelength conversion layer CL is disposed in at least one pixel PU. For example, the wavelength conversion layer CL is disposed on a plurality of light emitting units located in the same pixel PU. In some embodiments (as shown inFIG. 4), the wavelength conversion layer CL is disposed on light emitting units (including a light emitting unit PB11emitting blue light, a light emitting unit PG11emitting green light and/or a light emitting unit PR11emitting red light) with different colors, but is not limited thereto. In some embodiments (as shown inFIG. 4), the wavelength conversion layer CL covers the light emitting units (including the light emitting unit PB11emitting blue light, the light emitting unit PG11emitting green light, and the light emitting unit PR11emitting red light) with different colors. In some embodiments (as shown inFIG. 4), the wavelength conversion layer CL may be further disposed on at least a portion of a first light shielding structure102. In some embodiments (as shown inFIG. 4), in the cross-sectional direction, the upper surface of the wavelength conversion layer CL may have a curved shape.

Referring toFIG. 5, the main differences between the display device3and the display device2inFIG. 4are described in the following. In the display device3, a wavelength conversion layer CL is disposed on light emitting units of a plurality of pixels PU. In some embodiments (as shown inFIG. 5), the wavelength conversion layer CL is disposed on the light emitting units of all the pixels PU in a first display module10(or a second display module12). In some embodiments (as shown inFIG. 5), the wavelength conversion layer CL covers the light emitting units of all the pixels PU in the first display module10(or the second display module12). In some embodiments (as shown inFIG. 5), the wavelength conversion layer CL may be disposed on a first light shielding structure102.

Referring toFIG. 6, the main differences between the display device4and the display device1inFIG. 2are described in the following. In the display device4, a first wavelength conversion layer P12and/or a second wavelength conversion layer P22may include an active layer PA and a first protective layer PP1. In some embodiments (as shown inFIG. 6), the first protective layer PP1is disposed between a first light emitting unit PB11-1(and/or a second light emitting unit PB11-2) and the active layer PA. The first protective layer PP1may be used to separate the light emitting unit (such as the first light emitting unit PB11-1or the second light emitting unit PB11-2) from the active layer PA to reduce the influence of heat generated by the light emitting unit on the active layer PA, such as the influence of the light emitting characteristic of the active layer PA, but is not limited thereto. In some embodiments, the first protective layer PP1includes a transparent material, a moisture-proof material, other suitable materials or a combination thereof, but is not limited thereto. For example, the material of the first protective layer PP1may include epoxy, acrylic-based resin, silicone, polyimide polymer or a combination thereof, but is not limited thereto. In some embodiments, the material of the active layer PA may include fluorescent, phosphorescent, QD, other suitable materials or a combination thereof, but is not limited thereto. In addition, the wavelength conversion layer CL in other drawings (for example,FIG. 4andFIG. 5) may also selectively include the first protective layer PP1and the active layer PA.

Referring toFIG. 7, the main differences between the display device5and the display device4inFIG. 6are described in the following. In the display device5, a first wavelength conversion layer P12and/or a second wavelength conversion layer P22may further comprise a second protective layer PP2. The second protective layer PP2is disposed on an active layer PA. Alternatively, the second protective layer PP2covers the active layer PA. As shown inFIG. 7, the active layer PA is disposed between a first protective layer PP1and the second protective layer PP2. The second protective layer PP2may be used to separate the active layer PA from the external environment for reducing the influence of air and/or water vapor in the external environment to the active layer PA. In some embodiments, the second protective layer PP2includes, for example, a transparent material, a moisture-proof material, other suitable materials or a combination thereof, but is not limited thereto. For example, the material of the second protective layer PP2may include epoxy, acrylic-based resin, silicone, polyimide polymer, etc., but is not limited thereto. In some embodiments, the materials of the first protective layer PP1and the second protective layer PP2may be the same or different. In some embodiments, the first protective layer PP1and/or the second protective layer PP2may be a single layer structure or a multilayer structure. The wavelength conversion layer CL in other drawings (for example,FIG. 4andFIG. 5) may selectively include the first protective layer PP1, the active layer PA, and/or the second protective layer PP2.

Referring toFIG. 8, the main differences between the display device6and the display device1inFIG. 2are described in the following. The display device6includes a first light shielding structure102and a second light shielding structure104. As shown inFIG. 8, in a first display module10and/or a second display module12, the second light shielding structure104is disposed on the first light shielding structure102. In some embodiments (as shown inFIG. 8), the first light shielding structure102overlaps with the second light shielding structure104in a normal direction Z of an array substrate100(or a top view direction of the display device6). In some embodiments (as shown inFIG. 8), the first light shielding structure102and the second light shielding structure104are respectively disposed or formed on different substrates. The first light shielding structure102is disposed or formed on the array substrate100, and the second light shielding structure104is disposed or formed on a substrate200, wherein the substrate200is disposed opposite to the array substrate100. In some embodiments (as shown inFIG. 8), the wavelength conversion layer (including a first wavelength conversion layer P12and/or a second wavelength conversion layer P22) is disposed on the substrate200, and the second light shielding structure104is disposed on the substrate200and surrounds the first wavelength conversion layer P12and/or the second wavelength conversion layer P22, but are not limited thereto. In some embodiments (as shown inFIG. 8), the first wavelength conversion layer P12may be disposed on a first light emitting unit PB11-1and may not contact the first light emitting unit PB11-1, and the second wavelength conversion layer P22may be disposed on a second light emitting unit PB11-2, and the second wavelength conversion layer P22may not contact the second light emitting unit PB11-2. In some embodiments, the first light shielding structure102and the second light shielding structure104may contact or not contact each other. In some embodiments, the area of the first light shielding structure102projected on the array substrate100may be the same as or different from the area of the second light shielding structure104projected on the array substrate100. In some embodiments, the material of the first light shielding structure102and the material of the second light shielding structure104may be the same or different. In some embodiments, the thickness of the first light shielding structure102and the thickness of the second light shielding structure104may be the same or different in a normal direction Z of the array substrate100. In some embodiments, in the cross-sectional direction, the appearance of the first light shielding structure102and the appearance of the second light shielding structure104may be the same or different. In some embodiments, a fixing element including an adhesive material may be disposed between the substrate200and the array substrate100, but is not limited thereto.

Referring toFIG. 9, the main differences between the display device7and the display device1inFIG. 2are described in the following. In the display device7, a blue light emitting unit PB11is included in a red sub-pixel PR, a green sub-pixel PG, and/or a blue sub-pixel PB. In some embodiments, the blue light emitting unit PB11shown inFIG. 9may be replaced by other suitable light emitting units, such as a UV light emitting unit, but is not limited thereto. In addition, the red sub-pixel PR further includes a wavelength conversion layer PR12. The wavelength conversion layer PR12is disposed on the blue light emitting unit PB11. The wavelength conversion layer PR12may convert at least a portion of blue light emitted by the blue light emitting unit PB11into red light. In addition, the green sub-pixel PG further includes a wavelength conversion layer PG12. The wavelength conversion layer PG12is disposed on the blue light emitting unit PB11. The wavelength conversion layer PG12may convert at least a portion of blue light emitted by the blue light emitting unit PB11into green light. In addition, the blue sub-pixel PB further includes a wavelength conversion layer PB12. The wavelength conversion layer PB12is disposed on the blue light emitting unit PB11. The wavelength conversion layer PB12may convert at least a portion of blue light emitted by the blue light emitting unit PB11into blue light having other wavelength band, such as converting blue light having a short wavelength into blue light having a long wavelength, but is not limited thereto.

Referring toFIG. 10, the main differences between the display device8and the display device7inFIG. 9are described in the following. The display device8includes a filter layer F. The filter layer F is disposed on a wavelength conversion layer (including a wavelength conversion layer PR12, a wavelength conversion layer PG12, a wavelength conversion layer PB12and/or a wavelength conversion layer CL). The wavelength conversion layer may be compared with the first wavelength conversion layer (P12) or the second wavelength conversion layer (P22). The wavelength band filtered by the filter layer F may be designed according to requirements. For example, the filter layer F may be used to reduce the intensity of light having the wavelength at the first sub-peak and/or the second sub-peak. The filter layer may be used to increase the chance of the excitation light emitted by the light emitting unit being filtered out. For example, the filter layer F may be used to increase the chance of blue light (such as blue light having a short wavelength) emitted by a blue light emitting unit PB11being filtered out. In some embodiments (as shown inFIG. 10), the filter layer F may cover the wavelength conversion layer (including the wavelength conversion layer PG12, the wavelength conversion layer PR12, the wavelength conversion layer PB12and/or the wavelength conversion layer CL) in a pixel PU. In another embodiment (not shown), at least one sub-pixel or all sub-pixels in a display module may share one filter layer F, that is, the filter layer F may be disposed on the light emitting unit of at least one sub-pixel or the light emitting units of all the sub-pixels. In some embodiments (not shown), the filter layer F may cover the light emitting unit of at least one sub-pixel or the light emitting units of all the sub-pixels. In some embodiments (not shown), a plurality of filter layers F may be respectively disposed on light emitting units of a plurality of sub-pixels. In some embodiments (not shown), the thickness of the filter layer F corresponding to light emitting units of sub-pixels with different colors may be different, and the thickness of the filter layer F corresponding to light emitting units of sub-pixels with different colors may be adjusted according to the degree of filtering required by the different sub-pixels. In another embodiment (not shown), the wavelength conversion layer may include at least one active layer, at least one protective layer, and/or at least one filter layer. In an embodiment, the active layer, the protective layer, and/or the filter layer may be a single layer or multilayer material. In some embodiments (not shown), the active layer (may refer toFIG. 8) may be disposed between the filter layer F and the light emitting unit PB11in a normal direction Z of an array substrate100, but is not limited thereto. In some embodiments (refer toFIG. 6orFIG. 7), a protective layer PP1is disposed between a light emitting unit and an active layer PA. In some embodiments (not shown), a protective layer PP2may be disposed between the active layer PA and the filter layer F, but is not limited thereto. In some embodiments (as shown inFIG. 10), the filter layer may be further disposed on at least a portion of a first light shielding structure102. In some embodiments (as shown inFIG. 10), in the cross-sectional direction, the upper surface of the wavelength conversion layer CL may have a curved shape.

In summary, in the embodiments of the disclosure, the wavelength conversion layer is respectively disposed in the plurality of sub-pixels with the same color (the wavelength difference between the main-peaks is less than 20 nm) to reduce the color difference (wavelength difference) between the plurality of sub-pixels with the same color. Therefore, the display device according to the embodiments of the disclosure can reduce the visibility of color difference, or improving the display quality. In an embodiment, a portion of the excitation light may be absorbed or filtered by the filter layer, thereby reducing the light intensity of the sub-peak, or to improving the display quality of the display device. In another embodiment, the wavelength conversion layer may be a single-layer active layer or a stacked layer including other functional layer (for example, at least one protective layer and/or at least one filter layer).

The above embodiments are only used to explain the technical solution of the disclosure, but not to limit the disclosure. Although the disclosure has been described in detail with reference to the foregoing embodiments, persons skilled in the art should understand that modifications may be made to the technical solution recited in the foregoing embodiments or replacements may be made to some or all the equivalent technical features. These modifications or replacements do not make the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments.

Although the embodiments and advantages of the disclosure have been disclosed as above, it should be understood that persons skilled in the art may make changes, replacements, and modifications without departing from the spirit and scope of the disclosure. In addition, the scope of protection of the disclosure is not limited to the process, machine, manufacturing, substance composition, device, method, and steps described in the specific embodiments of the specification. Any persons skilled in the art may understand the current or future development of the process, machine, manufacturing, substance composition, device, methods, and steps from the disclosure, as long as substantially the same functions may be implemented or substantially the same results may be obtained in the embodiments described herein, they may be used according to the disclosure. Therefore, the scope of protection of the disclosure includes the processor, machine, manufacturing, substance composition, device, method, and steps. In addition, each claim constitutes a separate embodiment and the scope of protection of the disclosure also includes combinations of various claims and embodiments. The scope of protection of the disclosure shall be determined by the scope of the appended claims.