Display device

Abstract

The application discloses a display device, which comprises a circuit substrate, a light-emitting layer, a wavelength conversion layer and a blue phase liquid crystal film. The light-emitting layer is arranged on the circuit substrate. The light-emitting layer comprises a plurality of light-emitting structures, and the light-emitting structures are electrically connected with the circuit substrate. The wavelength conversion layer is arranged on a side of the light-emitting layer which is opposite to the circuit substrate. The blue phase liquid crystal film is arranged on a side of the wavelength conversion layer which is opposite to the light-emitting layer. The display device provided by the application improves light conversion efficiency and light utilization rate, and simplifies the process and reduces the thickness.

Description

Technical Field

[0001] This invention relates to an imaging device, and more particularly to a display device. Background Technology

[0002] Display devices can be broadly categorized into liquid crystal displays (LCDs), organic light-emitting diode (OLED) displays, and micro-light-emitting diode (MSD) displays, based on their different types of light-emitting elements. Compared to LCDs, OLEDs and MSDs can eliminate the need for a backlight module and LCD panel, thus effectively reducing the overall thickness. Generally, MSDs can use multiple light-emitting chips of different wavelengths to form pixels, or multiple light-emitting chips of the same wavelength combined with wavelength conversion materials to form pixels.

[0003] However, known display devices still suffer from poor light conversion efficiency, resulting in poor color purity of the converted light. To improve this problem, known display devices also require color filters, which leads to drawbacks such as excessive thickness, complex manufacturing processes, and poor light utilization.

[0004] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some known technologies that are not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of this invention were known or understood by those skilled in the art prior to this application. Summary of the Invention

[0005] The present invention provides a display device to improve light conversion efficiency and light utilization, and to simplify the manufacturing process and reduce thickness.

[0006] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.

[0007] To achieve one, some, or all of the above-mentioned objectives, or other objectives, one embodiment of the present invention provides a display device, including a circuit substrate, a light-emitting layer, a wavelength conversion layer, and a blue phase liquid crystal film. The light-emitting layer is disposed on the circuit substrate. The light-emitting layer includes a plurality of light-emitting structures, and the light-emitting structures are electrically connected to the circuit substrate. The wavelength conversion layer is disposed on the side of the light-emitting layer opposite to the circuit substrate. The blue phase liquid crystal film is disposed on the side of the wavelength conversion layer opposite to the light-emitting layer.

[0008] The display device of the present invention employs a wavelength conversion layer to convert the wavelength of the light beam from the light-emitting layer, and then reflects the unconverted wavelength light beam back to the wavelength conversion layer through a blue phase liquid crystal film. The wavelength conversion layer then converts the light beam back into the desired color light, thereby improving light conversion efficiency and image color purity. Therefore, the display device of the present invention can omit color filters, thereby reducing thickness and simplifying the manufacturing process, while also improving light utilization.

[0009] To make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0010] Figure 1 This is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention.

[0011] Figure 2 yes Figure 1 A schematic diagram of the transmission spectrum of a blue phase liquid crystal film in one embodiment of a display device.

[0012] Figure 3 This is a cross-sectional schematic diagram of a display device according to another embodiment of the present invention.

[0013] Figure 4 yes Figure 3 A schematic diagram of the arrangement of blue phase liquid crystal molecules in an embodiment of a blue phase liquid crystal film.

[0014] Figure 5 This is a cross-sectional schematic diagram of a display device according to another embodiment of the present invention.

[0015] Explanation of reference numerals in the attached figures:

[0016] 100, 100a, 100b: Display devices

[0017] 110: Circuit board

[0018] 120: Emissive layer

[0019] 121: Light-emitting structure

[0020] 122: Light-shielding structure

[0021] 130, 130b: Wavelength conversion layer

[0022] 131: Wavelength conversion section

[0023] 132: Wavelength Maintenance Section

[0024] 140, 140a: blue phase liquid crystal film

[0025] 141, 141a: LCD section

[0026] 142: Perforated section

[0027] 150: Protective layer

[0028] 1211: First light-emitting structure

[0029] 1212: Second light-emitting structure

[0030] 1213: Third light-emitting structure

[0031] 1311, 1312: Wavelength conversion region

[0032] A: Adhesive layer

[0033] L1, L2, L3: Blue phase liquid crystal layer

[0034] H: Perforation

[0035] M: Light scattering material

[0036] N: Normal direction

[0037] PX, PXa: Pixel unit

[0038] S, S1: Surface

[0039] SS: Side view

[0040] TS, TS1: Top surface. Detailed Implementation

[0041] The foregoing descriptions and other technical contents, features, and effects of this invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms used in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention.

[0042] Figure 1 This is a cross-sectional schematic diagram of a display device according to an embodiment of the present invention. Please refer to it. Figure 1 The display device 100 includes a circuit board 110, a light-emitting layer 120, a wavelength conversion layer 130, and a blue phase liquid crystal film 140. The display device 100 has at least one pixel unit PX, and forms an image displayed by the display device 100 by arranging one or more pixel units PX and displaying corresponding colors. The light-emitting layer 120 is disposed on the circuit board 110. The light-emitting layer 120 includes a plurality of light-emitting structures 121, and the light-emitting structures 121 are electrically connected to the circuit board 110. The wavelength conversion layer 130 is disposed on the side of the light-emitting layer 120 opposite to the circuit board 110. The blue phase liquid crystal film 140 is disposed on the side of the wavelength conversion layer 130 opposite to the light-emitting layer 120. It should be noted that... Figure 1Although it is presented as a single pixel unit PX of the display device 100, it is only used to clearly illustrate the structure of the single pixel unit PX of the display device 100 in this case, and is not used to limit the display device 100 in this case to having only a single pixel unit PX.

[0043] The circuit board 110 may include a driving circuit layer (not shown) for electrically connecting each light-emitting structure 121 to drive each light-emitting structure 121 to emit light. The circuit board 110 in this embodiment includes, for example, a printed circuit board (PCB), glass, flexible materials, etc., but the present invention is not limited thereto.

[0044] In this embodiment, the light-emitting layer 120 within the pixel unit PX includes a plurality of light-emitting structures 121, and the plurality of light-emitting structures 121 may include a first light-emitting structure 1211 and a second light-emitting structure 1212. Furthermore, the plurality of light-emitting structures 121 may further include a third light-emitting structure 1213. In other words, the pixel unit PX of the display device 100 includes, for example, three light-emitting structures 121, each corresponding to one of the three sub-pixel units of the pixel unit PX, and the three light-emitting structures 121 are respectively the first light-emitting structure 1211, the second light-emitting structure 1212, and the third light-emitting structure 1213. In this embodiment, the plurality of light-emitting structures 121 may include, for example, a plurality of blue light-emitting structures. The light-emitting structure 121 may include a micro-LED. Further, the chip of the aforementioned micro-LED may have an area of ​​less than 100µm * 100µm (micrometers), for example, an area of ​​50µm * 50µm, but the present invention is not limited thereto.

[0045] In one embodiment, the light-emitting structure 121 may include a mini light-emitting diode (mini-LED) or an organic light-emitting diode (OLED), and other embodiments are not limited thereto.

[0046] The light-emitting layer 120 in this embodiment may further include a light-shielding structure 122. The light-shielding structure 122 is disposed coplanarly with the plurality of light-emitting structures 121 on the circuit substrate 110. In this embodiment, the light-shielding structure 122 is disposed coplanarly with the plurality of light-emitting structures 121 on the surface S of the circuit substrate 110, and the plurality of light-emitting structures 121 are separated into a plurality of individual light-emitting structures 121 by the light-shielding structure 122. Specifically, the light-shielding structure 122 may be located between two adjacent light-emitting structures 121 and cover the side surface SS of each light-emitting structure 121 to prevent light emitted by the light-emitting structure 121 from leaking onto the adjacent light-emitting structure 121, thereby interfering with the display of adjacent sub-pixel units. In addition, the display device 100 also includes an adhesive layer A located between the light-emitting layer 120 and the wavelength conversion layer 130, wherein the surface S1 of the light-shielding structure 122 facing away from the circuit substrate 110 may be coplanar with the top surface TS of each light-emitting structure 121. In other words, the light-shielding structure 122 and each light-emitting structure 121 are at the same height in the normal direction N of the surface S of the circuit substrate 110, so that the surface S1 and each top surface TS form a plane, which facilitates the placement of the adhesive layer A and the bonding of the wavelength conversion layer 130. The light-shielding structure 122 may include, for example, black photoresist, but the present invention is not limited thereto. In this embodiment, each light-emitting structure 121 may also include, for example, a reflective layer (not shown), to reflect a portion of the light beam emitted by the light-emitting structure 121 that is directed toward the circuit substrate 110 back to the wavelength conversion layer 130, thereby further improving light utilization. The material of the reflective layer may be a metal such as aluminum, gold, or titanium.

[0047] The wavelength conversion layer 130 absorbs the light beam emitted by the light-emitting structure 121 and is excited to generate a converted light beam, wherein the wavelength of the converted light beam is different from the wavelength of the light beam emitted by the light-emitting structure 121, so that the color of the converted light beam emitted by the wavelength conversion layer 130 is different from the color of the light beam emitted by the light-emitting structure 121. In this embodiment, the wavelength conversion layer 130 may include a quantum dot conversion layer, which has the characteristics of narrow excitation spectrum and tunable emitted light beam wavelength, thus improving the color purity of the emitted light beam. In addition, the quantum dot conversion layer also has the advantage of high conversion efficiency. Incidentally, the quantum dot conversion layer can be formed by inkjet printing, but in other embodiments, the aforementioned quantum dot conversion layer can be formed by photolithography to coat fluorescent solution and reactive-ion etching (RIE) steps, and the present invention does not limit the specific steps. In one embodiment, the wavelength conversion layer 130 may include organic fluorescent dyes, phosphorescent dyes or perovskite nanocrystals, and the present invention is not limited to these.

[0048] In this embodiment, the wavelength conversion layer 130 may have a wavelength conversion section 131 and a wavelength maintenance section 132. The wavelength conversion section 131 is located at least on the first light-emitting structure 1211, and the wavelength maintenance section 132 is located on the second light-emitting structure 1212. For example, the plurality of light-emitting structures 121 may include a first light-emitting structure 1211 and a second light-emitting structure 1212, wherein the first light-emitting structure 1211 and the second light-emitting structure 1212 may be adapted to emit light beams of the same color, such as blue light beams, but are not limited thereto. The wavelength conversion section 131 is located on the first light-emitting structure 1211 and is adapted to absorb and convert the light beam of the first light-emitting structure 1211 into a red light beam. On the other hand, the wavelength maintenance section 132 does not change the wavelength of the light beam of the second light-emitting structure 1212, that is, the wavelength maintenance section 132 can directly supply the light beam emitted by the second light-emitting structure 1212. Furthermore, the wavelength maintenance section 132 may include, for example, a perforation H, so that the light beam of the second light-emitting structure 1212 can directly pass through the wavelength maintenance section 132, thereby further improving the light utilization rate. In addition, in this embodiment, the plurality of light-emitting structures 121 further includes a third light-emitting structure 1213, wherein the third light-emitting structure 1213 is adapted, for example, to emit a light beam of the same color as the light beams emitted by the first light-emitting structure 1211 and the second light-emitting structure 1212. The wavelength conversion unit 131 may have wavelength conversion regions 1311 and 1312 with different emission wavelengths. Wavelength conversion regions 1311 and 1312 are respectively located opposite to the first light-emitting structure 1211 and the third light-emitting structure 1213, that is, wavelength conversion region 1311 is located opposite to the first light-emitting structure 1211, and wavelength conversion region 1312 is located opposite to the third light-emitting structure 1213. Specifically, wavelength conversion region 1311 can convert the light beam of the first light-emitting structure 1211 into a green light beam, and wavelength conversion region 1312 can convert the light beam of the third light-emitting structure 1213 into a red light beam. It should be noted that the above-mentioned alignment refers to alignment in the normal direction N of the surface S on which the light-emitting layer 120 is disposed on the circuit board 110. For example, the wavelength conversion region 1311 is located opposite the first light-emitting structure 1211 in the normal direction N, the wavelength maintenance part 132 is located opposite the second light-emitting structure 1212 in the normal direction N, and the wavelength conversion region 1312 is located opposite the third light-emitting structure 1213 in the normal direction N.

[0049] A portion of the light beam emitted by the light-emitting structure 121 is absorbed and converted into a converted light beam within the wavelength conversion layer 130. Conversely, another portion of the light beam emitted by the light-emitting structure 121 is not absorbed or converted after incident on the wavelength conversion layer 130. This other portion of the light beam, after passing through the wavelength conversion layer 130, is incident on the blue phase liquid crystal film 140. The blue phase liquid crystal film 140 can reflect this unconverted portion of the light beam back to the wavelength conversion layer 130, while allowing the converted light beam from the wavelength conversion layer 130, whose wavelength has been absorbed and converted, to pass through, thereby improving the light conversion efficiency. In this embodiment, the blue phase liquid crystal film 140 may have a liquid crystal portion 141 and a perforated portion 142. The liquid crystal portion 141 is located opposite the wavelength conversion portion 131, and the perforated portion 142 is located opposite the wavelength maintenance portion 132. Specifically, the perforated portion 142 allows the light beam generated by the second light-emitting structure 1212 to pass directly through, thereby improving the emitted light brightness. Furthermore, the liquid crystal unit 141 can reflect a portion of the light beam from the first light-emitting structure 1211 that has not been absorbed and converted after passing through the wavelength conversion layer 130 back to the wavelength conversion layer 130, and allow the converted light beam from the wavelength conversion layer 130 that has been absorbed and converted to pass through, thereby improving the light conversion efficiency. In addition, in this embodiment, when the plurality of light-emitting structures 121 also includes a third light-emitting structure 1213, and the wavelength conversion unit 131 may have wavelength conversion regions 1311 and 1312 with different emission wavelengths, the liquid crystal unit 141 is, for example, located in the wavelength conversion regions 1311 and 1312, that is, the liquid crystal unit 141 is located in the first light-emitting structure 1211 and the third light-emitting structure 1213. Thus, a portion of the light beam emitted by the first light-emitting structure 1211 and the third light-emitting structure 1213 but not absorbed and converted by the wavelength conversion unit 131 (such as the aforementioned blue light beam) can be reflected back to the wavelength conversion unit 131 by the blue phase liquid crystal film 140, while the converted light beam that has been absorbed and converted in wavelength from the wavelength conversion unit 131 (such as the aforementioned red light beam and green light beam) can be emitted through the blue phase liquid crystal film 140.

[0050] Figure 2 yes Figure 1 A schematic diagram of the transmission spectrum of a blue phase liquid crystal film in one embodiment of a display device. For example, please also refer to... Figure 1 and Figure 2 In this embodiment, the liquid crystal section 141 allows red and green light beams to pass through and reflects other colored light beams (including blue light beams) back to the wavelength conversion layer 130. Furthermore, the blue phase liquid crystal film 140 may include two blue phase liquid crystal layers with different light transmission wavelengths, allowing red and green light beams to pass through respectively, and reflecting other colored light beams back to the wavelength conversion layer 130. In one embodiment, the reflection wavelength range of the blue phase liquid crystal film 140 may cover approximately 80% of the emission wavelength range of the light-emitting structure 121, but the invention is not limited thereto. Similarly, the above-mentioned alignment refers to alignment in the normal direction N.

[0051] It should be noted that the blue phase liquid crystal film 140 in this embodiment uses a cured light-transmitting material (such as a polymer that can be cured by ultraviolet light or heat) to coat the liquid crystal molecules. Therefore, after the blue phase liquid crystal film 140 is manufactured, the liquid crystal molecules are arranged at a fixed angle, and even if a voltage is applied to the blue phase liquid crystal film 140, the liquid crystal molecules cannot be driven to rotate. In other words, the blue phase liquid crystal film 140 in this embodiment is not an electro-controlled liquid crystal film, so the alignment layer and electrode layer of the aforementioned electro-controlled liquid crystal film can be omitted. Therefore, compared with electro-controlled liquid crystal films, the manufacturing process and structure can be simplified, and the thickness can also be reduced. In addition, omitting the electro-control step can also make the blue phase liquid crystal film 140 have better optical stability and a longer product life.

[0052] Compared to known technologies, the display device 100 of this embodiment uses a wavelength conversion layer 130 to absorb and convert the wavelength of the light beam from the light-emitting layer 120. The blue phase liquid crystal film 140 reflects the portion of the light beam that has not been absorbed and converted back to the wavelength conversion layer 130, allowing the wavelength conversion layer 130 to absorb and convert this portion of the light beam into the desired color light, thereby improving light conversion efficiency and image color purity. Therefore, the display device 100 of this embodiment can omit color filters, thereby reducing thickness and simplifying the manufacturing process, while also improving light utilization.

[0053] For example, known display devices may use cholesteric liquid crystals, but the wavelength bandwidth of the reflected light beam from cholesteric liquid crystals is wider than that of the blue phase liquid crystal film 140. This makes it impossible to accurately reflect light beams whose wavelengths have not been absorbed and converted, resulting in poor light conversion efficiency and color purity. Conversely, because the wavelength bandwidth of the reflected light beam from the blue phase liquid crystal film 140 is narrower than that of cholesteric liquid crystals, it can accurately reflect light beams whose wavelengths have not been absorbed and converted back to the wavelength conversion layer 130, thereby effectively improving the light conversion efficiency and color purity. Furthermore, cholesteric liquid crystals can cause color shift in the display device 100 at wide viewing angles, but the blue phase liquid crystal film 140 can effectively improve this problem. Moreover, the blue phase liquid crystal film 140 can maintain the ordered orientation of liquid crystal molecules over a wider temperature range, thus possessing more stable optical performance than cholesteric liquid crystals. In addition, the wavelength bandwidth of the reflected light beam from the blue phase liquid crystal film 140 can be adjusted during the manufacturing process according to actual needs, so compared to cholesteric liquid crystals, the blue phase liquid crystal film 140 can more accurately control the color purity of the emitted light beam.

[0054] Incidentally, the display device 100 of this embodiment also includes, for example, a protective layer 150. The protective layer 150 is disposed on the side of the blue phase liquid crystal film 140 opposite to the wavelength conversion layer 130 to protect the blue phase liquid crystal film 140 from external damage and to prevent moisture and dust from penetrating. The protective layer 150 may include glass, but the present invention is not limited thereto.

[0055] Figure 3This is a cross-sectional schematic diagram of a display device according to another embodiment of the present invention. The structure and advantages of the display device 100a in this embodiment are similar to those of the present invention. Figure 1 The following describes only the differences in the embodiments. Please refer to... Figure 3 The liquid crystal portion 141a of the blue phase liquid crystal film 140a is located opposite the wavelength conversion portion 131 and the wavelength maintenance portion 132. Therefore, the light beams emitted from the wavelength conversion portion 131 and the wavelength maintenance portion 132 will both pass through the liquid crystal portion 141a, making the light emission pattern of the pixel unit PXa more consistent, making the color rendering of the display device 100a more accurate at different viewing angles, thereby increasing the viewing angle of the display device 100a. In this embodiment, the liquid crystal portion 141a may include at least two blue phase liquid crystal layers with different light transmission wavelengths disposed coplanarly on the top surface TS1 of the wavelength conversion layer 130. In this embodiment, blue phase liquid crystal layers L1 and L2 are used as examples. The blue phase liquid crystal layer L1 is located opposite the wavelength conversion portion 131 of the wavelength conversion layer 130, and the blue phase liquid crystal layer L2 is located opposite the wavelength maintenance portion 132. In addition, in this embodiment, when the plurality of light-emitting structures 121 further includes a third light-emitting structure 1213, and the wavelength conversion section 131 may have wavelength conversion regions 1311 and 1312 with different emission wavelengths, the liquid crystal section 141a may further include a blue phase liquid crystal layer L3. The blue phase liquid crystal layers L1, L2, and L3 are disposed in a coplanar manner on the top surface TS1 of the wavelength conversion layer 130 and have different light transmission wavelengths. The blue phase liquid crystal layers L1 and L3 are respectively located in the wavelength conversion regions 1311 and 1312 of the wavelength conversion section 131 of the wavelength conversion layer 130, and the blue phase liquid crystal layer L2 is located in the wavelength maintenance section 132. The three light transmission wavelengths can respectively correspond to the wavelengths of the emitted light beams from the wavelength conversion region 1311, the wavelength conversion region 1312, and the wavelength maintenance section 132. For example, the light transmission wavelengths can correspond to red light (wavelength conversion region 1312), green light (wavelength conversion region 1311), and blue light (wavelength maintenance section 132), respectively. The blue phase liquid crystal layer, whose light transmission wavelength corresponds to blue light, allows blue light to pass through and makes the emission field pattern of the blue light consistent with that of red and green light. Similarly, the above alignment refers to alignment in the normal direction N.

[0056] Figure 4 yes Figure 3 A schematic diagram of the arrangement of blue phase liquid crystal molecules in an embodiment of a blue phase liquid crystal film. Please refer to the diagram as well. Figure 3 and Figure 4Furthermore, in one embodiment, the blue phase liquid crystal film 140a has exposed regions corresponding to red light (wavelength conversion region 1312) and green light (wavelength conversion region 1311), namely, the blue phase liquid crystal layers L1 and L3. Therefore, the blue phase liquid crystal structure of the blue phase liquid crystal layers L1 and L3 maintains lattice orientation order. On the other hand, the blue phase liquid crystal film 140a has unexposed regions corresponding to blue light (wavelength maintenance region 132), namely, the blue phase liquid crystal layer L2. Therefore, the blue phase liquid crystal structure of the blue phase liquid crystal layer L2 is unstable and exhibits a disordered helical arrangement. Thus, the blue phase liquid crystal layer L2 exhibits optical scattering characteristics, making the light emission pattern of the light beam (e.g., blue light) passing through the blue phase liquid crystal layer L2 more consistent with the light beam (e.g., red light) passing through the blue phase liquid crystal layer L1 and the light beam (e.g., green light) passing through the blue phase liquid crystal layer L3. It is understood that... Figure 4 The arrangement of blue phase liquid crystal molecules shown is merely an example and is not intended to limit the invention.

[0057] Figure 5 This is a cross-sectional schematic diagram of a display device according to another embodiment of the present invention. The structure and advantages of the display device 100b in this embodiment are similar to those of the present invention. Figure 1 The following describes only the differences in the embodiments. Please refer to... Figure 5 The perforated portion 142 of the blue phase liquid crystal film 140 includes, for example, a light-scattering material M, which makes the light emission pattern of the light beam passing through the light-scattering material M more consistent with the light emission pattern of the light beam passing through the liquid crystal portion 141, thereby making the color rendering of the display device 100b more accurate at different viewing angles and increasing the viewing angle of the display device 100b. For example, the light-scattering material M may include light-diffusing particles, etc., and the light-diffusing particles can scatter the light beam emitted by the second light-emitting structure 1212, but do not have the function of converting the wavelength of the light beam.

[0058] In summary, the display device of the present invention employs a wavelength conversion layer to convert the wavelength of the light beam from the light-emitting layer, and then reflects the unconverted wavelength light beam back to the wavelength conversion layer through a blue phase liquid crystal film. The wavelength conversion layer then converts the light beam back into the desired color light, thereby improving light conversion efficiency and image color purity. Therefore, the display device of the present invention can omit color filters, thereby reducing thickness and simplifying the manufacturing process, while also improving light utilization.

[0059] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the invention are still within the scope of this patent. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the invention. In addition, the abstract and title (invention title) are only used to assist in patent document retrieval and are not intended to limit the scope of the invention. Furthermore, the terms "first," "second," etc., mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

Claims

1. A display device, characterized in that, The display device includes a circuit board, a light-emitting layer, a wavelength conversion layer, and a blue phase liquid crystal film, wherein: The light-emitting layer is disposed on the circuit substrate, and the light-emitting layer includes a plurality of light-emitting structures, and the plurality of light-emitting structures are electrically connected to the circuit substrate; The wavelength conversion layer is disposed on the side of the light-emitting layer opposite to the circuit substrate; and The blue phase liquid crystal film is disposed on the side of the wavelength conversion layer opposite to the light-emitting layer.

2. The display device according to claim 1, characterized in that, The wavelength conversion layer has a wavelength conversion section and a wavelength maintenance section. The plurality of light-emitting structures include a first light-emitting structure and a second light-emitting structure. The wavelength conversion section is located at least in the first light-emitting structure, and the wavelength maintenance section is located in the second light-emitting structure.

3. The display device according to claim 2, characterized in that, The wavelength maintenance section includes perforations.

4. The display device according to claim 2, characterized in that, The blue phase liquid crystal film has a liquid crystal portion and a perforated portion, the liquid crystal portion being located opposite the wavelength conversion portion and the perforated portion being located opposite the wavelength maintenance portion.

5. The display device according to claim 4, characterized in that, The perforated portion includes a light-scattering material.

6. The display device according to claim 2, characterized in that, The blue phase liquid crystal film has a liquid crystal section, which is located in the wavelength conversion section and the wavelength maintenance section.

7. The display device according to claim 2, characterized in that, The plurality of light-emitting structures further includes a third light-emitting structure. The wavelength conversion section has two wavelength conversion regions with different emission wavelengths, and the two wavelength conversion regions are respectively located in the first light-emitting structure and the third light-emitting structure.

8. The display device according to claim 7, characterized in that, The blue phase liquid crystal film has a liquid crystal portion, and the liquid crystal portion is located in the wavelength conversion region.

9. The display device according to claim 2, characterized in that, In the blue phase liquid crystal film, multiple blue phase liquid crystal molecules located in the wavelength maintenance region exhibit a disordered helical arrangement structure.

10. The display device according to claim 1, characterized in that, The plurality of light-emitting structures include a plurality of blue light-emitting structures.

11. The display device according to claim 1, characterized in that, The light-emitting layer further includes a light-shielding structure, which is disposed on the circuit substrate in a coplanar manner with the plurality of light-emitting structures, and the plurality of light-emitting structures are separated into a plurality of individual light-emitting structures by the light-shielding structure.

12. The display device according to claim 1, characterized in that, The wavelength conversion layer includes a quantum dot conversion layer.

13. The display device according to claim 1, characterized in that, The display device further includes a protective layer, wherein the protective layer is disposed on the side of the blue phase liquid crystal film opposite to the wavelength conversion layer.

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