Display module and display device

Abstract

The present invention discloses a display module and a display device. The display module includes: a light-emitting substrate having a light-emitting device configured to emit a first light; a color conversion substrate including a color conversion pattern, the color conversion pattern including quantum dots; the quantum dots configured to excite a second light when irradiated by the first light; a first functional film disposed between the light-emitting substrate and the color conversion substrate, the first functional film including a first film layer and a second film layer stacked, the second film layer being disposed proximate to the color conversion substrate, the first film layer being a quarter-wave plate for the first light, and the second film layer being a reflective polarizing film for the first light; and a second functional film disposed on a side of the color conversion substrate away from the light-emitting substrate, the second functional film including a third film layer and a fourth film layer stacked, the third film layer being disposed proximate to the color conversion substrate, the third film layer being a quarter-wave plate for the second light, and the fourth film layer being a reflective polarizing film for the second light. The film layer arrangement helps improve the module's luminous efficiency and reduce power consumption.

Description

Technical Field

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

[0002] The particle size of quantum dots is generally in the nanometer range (2-10nm), and they are composed of a core and a shell, which are wrapped by a polymer coating. Because their size is within the Bohr radius range, they show a significant quantum confinement effect, and their continuous energy band structure becomes a discrete energy level structure. Therefore, their emission spectrum is very narrow, with high color purity, and can present a good color gamut level. By absorbing blue light in some bands, quantum dot materials can stimulate green and red light in some bands, which can effectively improve the color gamut of the display screen and meet the needs of high-quality display applications. The display device realized by combining the QD+OLED module functional layer has shown good application prospects and can show better color purity and color gamut level. However, the luminous efficiency of the devices in the existing modules is low and the overall power consumption is high. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a display module and a display device to solve the problem of low luminous efficiency of QD+OLED module devices.

[0004] In a first aspect, an embodiment of the present invention provides a display module, comprising:

[0005] a light-emitting substrate having a light-emitting device configured to emit a first light;

[0006] a color conversion substrate, the color conversion substrate including a color conversion pattern, the color conversion pattern including quantum dots;

[0007] The quantum dots are configured to excite second light under the irradiation of the first light;

[0008] a first functional film, the first functional film being disposed between the light-emitting substrate and the color conversion substrate, the first functional film comprising a first film layer and a second film layer stacked together, the second film layer being disposed adjacent to the color conversion substrate, the first film layer being a quarter-wave plate for the first light, and the second film layer being a reflective polarizing film for the first light;

[0009] A second functional film is arranged on a side of the color conversion substrate away from the light-emitting substrate. The second functional film includes a third film layer and a fourth film layer stacked together. The third film layer is arranged close to the color conversion substrate. The third film layer is a 1 / 4 wave plate for the second light, and the fourth film layer is a reflective polarizing film for the second light.

[0010] Among them, also include:

[0011] A third functional film is provided between the first functional film and the color conversion substrate. The third functional film comprises a reflective polarizing film for the second light. The polarization direction of the third functional film is the same as that of the second film layer.

[0012] Wherein, the color conversion substrate comprises a first color conversion pattern having first quantum dots and a second color conversion pattern having second quantum dots;

[0013] The first quantum dot is configured to emit a first excitation light under the irradiation of the first light;

[0014] The second quantum dot is configured to emit a second excitation light under the irradiation of the first light, and the wavelength of the first excitation light is different from that of the second excitation light;

[0015] The third functional film includes a first functional layer corresponding to the first color conversion pattern and a second functional layer corresponding to the second color conversion pattern. The first functional layer is a reflective polarizing film for the first excitation light, and the second functional layer is a reflective polarizing film for the second excitation light.

[0016] wherein the color conversion substrate comprises a third color conversion pattern having third quantum dots;

[0017] The third quantum dot is configured to excite a third excitation light under the irradiation of the first light;

[0018] The third functional film includes a third functional layer corresponding to the third color conversion pattern, and the third functional layer is a reflective polarizing film for the third excitation light.

[0019] The area of ​​the third film layer corresponding to the first color conversion pattern is a quarter-wave plate for the first excitation light, and the area of ​​the fourth film layer corresponding to the first color conversion pattern is a reflective polarizing film for the first excitation light.

[0020] The area of ​​the third film layer corresponding to the second color conversion pattern is a quarter-wave plate for the second excitation light, and the area of ​​the fourth film layer corresponding to the second color conversion pattern is a reflective polarizing film for the second excitation light;

[0021] The area of ​​the third film layer corresponding to the third color conversion pattern is a quarter wave plate for the third excitation light, and the area of ​​the fourth film layer corresponding to the third color conversion pattern is a reflective polarizing film for the third excitation light.

[0022] Among them, also include:

[0023] A first linear polarizing film is disposed between the third functional film and the first functional film, and a polarization direction of the third functional film is the same as that of the first linear polarizing film.

[0024] Among them, also include:

[0025] a second linear polarizing film, the second linear polarizing film being disposed on a side of the second functional film away from the color conversion substrate, the polarization direction of the second linear polarizing film being the same as the polarization direction of the fourth film layer;

[0026] The angle between the polarization direction of the second linear polarizing film and the polarization direction of the first linear polarizing film is 90 degrees.

[0027] Among them, also include:

[0028] a third functional film and a fourth functional film, wherein the third functional film is disposed between the first functional film and the color conversion substrate, and the fourth functional film is disposed between the second functional film and the color conversion substrate;

[0029] The third functional film includes a quarter wave plate for the first light;

[0030] The fourth functional film includes a fifth film layer and a sixth film layer stacked together. The fifth film layer is disposed close to the color conversion substrate. The fifth film layer includes a quarter wave plate for the first light. The sixth film layer includes a reflective polarizing film for the first light.

[0031] Wherein, the optical axis directions of the first film layer, the third functional film and the fifth film layer are the same; and / or

[0032] The angle between the optical axis direction of the first film layer and the polarization direction of the sixth film layer is 45 degrees.

[0033] Wherein, the angle between the polarization direction of the fourth film layer and the optical axis direction of the third film layer is 45 degrees.

[0034] Among them, also include:

[0035] A third linear polarizing film is provided on a side of the second functional film away from the light-emitting substrate, and a polarization direction of the fourth film layer is the same as that of the third linear polarizing film.

[0036] Wherein, the color conversion substrate comprises a first color conversion pattern having first quantum dots and a second color conversion pattern having second quantum dots;

[0037] The first quantum dot is configured to emit a first excitation light under the irradiation of the first light;

[0038] The second quantum dot is configured to emit a second excitation light under the irradiation of the first light, and the wavelength of the first excitation light is different from that of the second excitation light;

[0039] The third film layer includes a first wave plate corresponding to the first color conversion pattern and a second wave plate corresponding to the second color conversion pattern, the first wave plate is a quarter wave plate for the first excitation light, and the second wave plate is a quarter wave plate for the second excitation light;

[0040] The fourth film layer includes a first region layer corresponding to the first color conversion pattern and a second region layer corresponding to the second color conversion pattern. The first region layer is a reflective polarizing film for the first excitation light, and the second region layer is a reflective polarizing film for the second excitation light.

[0041] wherein the color conversion substrate comprises a third color conversion pattern having third quantum dots;

[0042] The third quantum dot is configured to excite a third excitation light under the irradiation of the first light;

[0043] The first excitation light, the second excitation light and the third excitation light have different wavelengths;

[0044] The third film layer includes a third wave plate corresponding to the third color conversion pattern, and the third wave plate is a quarter wave plate for the third excitation light;

[0045] The fourth film layer includes a third region layer corresponding to the third color conversion pattern, and the third region layer is a reflective polarizing film for the third excitation light.

[0046] The area of ​​the third film layer corresponding to the first color conversion pattern is a quarter-wave plate for the first excitation light, and the area of ​​the fourth film layer corresponding to the first color conversion pattern is a reflective polarizing film for the first excitation light.

[0047] The area of ​​the third film layer corresponding to the second color conversion pattern is a quarter-wave plate for the second excitation light, and the area of ​​the fourth film layer corresponding to the second color conversion pattern is a reflective polarizing film for the second excitation light;

[0048] The area of ​​the third film layer corresponding to the third color conversion pattern is a quarter wave plate for the third excitation light, and the area of ​​the fourth film layer corresponding to the third color conversion pattern is a reflective polarizing film for the third excitation light.

[0049] In a second aspect, an embodiment of the present invention provides a display device, comprising the display module described in the above embodiment.

[0050] In the display module of an embodiment of the present invention, the light-emitting substrate has a light-emitting device and is configured to emit a first light; the color conversion substrate includes a color conversion pattern, and the color conversion pattern includes quantum dots; the quantum dots are configured to excite a second light under the irradiation of the first light; the first functional film is arranged between the light-emitting substrate and the color conversion substrate, the first functional film includes a first film layer and a second film layer that are stacked, the second film layer is arranged close to the color conversion substrate, the first film layer is a 1 / 4 wave plate for the first light, and the second film layer is a reflective polarizing film for the first light; the second functional film is arranged on the side of the color conversion substrate away from the light-emitting substrate, the second functional film includes a third film layer and a fourth film layer that are stacked, the third film layer is arranged close to the color conversion substrate, the third film layer is a 1 / 4 wave plate for the second light, and the fourth film layer is a reflective polarizing film for the second light.

[0051] A first functional film and a second functional film are provided on both sides of the color conversion substrate. The first light emitted by the light-emitting substrate passes through the first functional film. The quarter-wave plate for the first light and the reflective polarizing film for the first light stacked in the first functional film enable the first light to be efficiently irradiated as polarized light onto the quantum dots in the color conversion pattern. The quantum dots are excited by the first light to emit second light, thereby improving the luminous efficiency of the quantum dots. Since the quarter-wave plate for the second light and the reflective polarizing film for the second light are stacked in the second functional film, the second light can be emitted as polarized light, eliminating the need for a filter, thereby improving the luminous efficiency of the module and reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a structural diagram of a display module in one embodiment of the present invention;

[0053] Figure 2 is a structural schematic diagram of a display module in another embodiment of the present invention;

[0054] Figure 3 is a structural schematic diagram of a display module in yet another embodiment of the present invention;

[0055] Figure 4 is a structural schematic diagram of a display module in yet another embodiment of the present invention;

[0056] Figure 5 is a structural schematic diagram of a display module in yet another embodiment of the present invention;

[0057] Figure 6 is a structural schematic diagram of a display module in yet another embodiment of the present invention;

[0058] Figure 7 is a structural schematic diagram of a display module in yet another embodiment of the present invention;

[0059] Figure 8 is a structural schematic diagram of a display module in yet another embodiment of the present invention;

[0060] Figure 9 FIG. 4 is a structural diagram of a display module in another embodiment of the present invention.

[0061] Reference numerals

[0062] Light-emitting substrate 10;

[0063] First electrode 11; second electrode 12; light emitting layer 13;

[0064] First light-emitting layer 131; second light-emitting layer 132; third light-emitting layer 133;

[0065] Substrate 14; pixel circuit layer 15; packaging layer 16;

[0066] First encapsulation layer 161; second encapsulation layer 162; third encapsulation layer 163;

[0067] Touch layer 17; pixel definition layer 18; filling layer 19;

[0068] Color conversion substrate 20;

[0069] A first color conversion pattern 21; a second color conversion pattern 22; a third color conversion pattern 23;

[0070] First functional film 30; first film layer 31; second film layer 32;

[0071] A second functional film 40; a third film layer 41; and a fourth film layer 42;

[0072] First wave plate 411; second wave plate 412; third wave plate 413;

[0073] First regional layer 421; second regional layer 422; third regional layer 423;

[0074] a third functional film 50;

[0075] First functional layer 51; second functional layer 52; third functional layer 53;

[0076] A first linear polarizing film 61; a second linear polarizing film 62; and a third linear polarizing film 63;

[0077] a fourth functional film 70;

[0078] a fifth film layer 71 and a sixth film layer 72 . DETAILED DESCRIPTION

[0079] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0080] The terms "first," "second," and the like in the specification and claims of the present invention are used to distinguish similar objects and are not intended to describe a particular order or precedence. It should be understood that such terms are interchangeable where appropriate, so that embodiments of the present invention can be implemented in sequences other than those illustrated or described herein. Furthermore, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the connected objects are in an "or" relationship.

[0081] The following is combined with Figures 1 to 9 As shown, the display module provided by the embodiment of the present invention is described in detail through specific embodiments and application scenarios.

[0082] like Figures 1 to 9 As shown, a display module according to an embodiment of the present invention includes: a light-emitting substrate 10, a color conversion substrate 20, a first functional film 30, and a second functional film 40. The light-emitting substrate 10 includes a light-emitting device configured to emit a first light. The color conversion substrate 20 includes a color conversion pattern including quantum dots configured to excite a second light under irradiation with the first light. The first light may include at least one of blue light and ultraviolet light, and the second light may include at least one of red light, green light, and blue light. The first light may be blue light or ultraviolet light, and the second light may be red light or green light. For example, the first light may be blue light, and the second light may be red light; the first light may be blue light, and the second light may be green light; or the first light may be ultraviolet light, and the second light may be at least one of red light, green light, and blue light.

[0083] like Figure 1 and Figure 2As shown, the light-emitting substrate 10 may include a stacked first electrode 11, a light-emitting layer 13, a second electrode 12, and a substrate 14. The first electrode 11 may be an anode, and the second electrode 12 may be a cathode; alternatively, the first electrode 11 may be a cathode, and the second electrode 12 may be an anode. The light-emitting layer 13 may be driven to emit light by the first and second electrodes 11 and 12. The light-emitting layer 13 may include a first light-emitting layer 131, a second light-emitting layer 132, and a third light-emitting layer 133. The emission frequencies of the first, second, and third light-emitting layers 131, 132, and 133 may be the same or different. For example, the first, second, and third light-emitting layers 131, 132, and 133 may emit blue light or ultraviolet light. The luminous frequencies of the first light-emitting layer 131, the second light-emitting layer 132 and the third light-emitting layer 133 can be the same, for example, the first light-emitting layer 131, the second light-emitting layer 132 and the third light-emitting layer 133 can all emit ultraviolet light or blue light; the luminous frequencies of the first light-emitting layer 131, the second light-emitting layer 132 and the third light-emitting layer 133 can be different, for example, the first light-emitting layer 131 and the second light-emitting layer 132 can emit blue light, and the third light-emitting layer 133 can emit ultraviolet light, and the light emitted by the light-emitting layer can excite the quantum dots to emit light.

[0084] like Figures 3 to 9 As shown, a pixel definition layer 18 can be provided on the substrate 14. An opening can be provided on the pixel definition layer 18, and the light-emitting layer can be provided in the opening to prevent light crosstalk. A first opening, a second opening, and a third opening can be provided on the pixel definition layer 18. The first light-emitting layer 131 can be provided in the first opening, the second light-emitting layer 132 can be provided in the second opening, and the third light-emitting layer 133 can be provided in the third opening to prevent light crosstalk.

[0085] Alternatively, the cathode may include Ag, Mg, Cu, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, LiF / Ca, LiF / Al, Mo, Ti, or a compound or mixture thereof, such as a mixture of Ag and Mg. In some embodiments, the cathode may include a transparent conductive oxide (TCO). For example, the cathode may include tungsten oxide (W x O x ), titanium oxide (TiO2), indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO) or magnesium oxide (MgO), etc. The anode can be a single layer or a stacked layer structure, and can be made of metals such as Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir or Cr and their mixtures, or can be made of conductive metal oxide materials such as ITO, IZO or IGZO.

[0086] like Figure 1 and Figure 2As shown, the light-emitting substrate 10 may include a pixel circuit layer 15, which may be disposed between the substrate 14 and the first electrode 11. The pixel circuit layer 15 may include a thin film transistor. The light-emitting substrate 10 may include an encapsulation layer 16, which may be disposed on the side of the second electrode 12 away from the light-emitting layer 13. The touch control layer 17 may be disposed on the side of the encapsulation layer 16 away from the light-emitting layer 13. The encapsulation layer 16 may include a first encapsulation layer 161, a second encapsulation layer 162, and a third encapsulation layer 163, which are stacked. For example, the first encapsulation layer 161 and the third encapsulation layer 163 may be made of an inorganic material, and the inorganic material may be selected from at least one of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide, titanium oxide, tin oxide, cerium oxide, silicon oxynitride (SiON), or lithium fluoride. For another example, the second encapsulation layer 162 can be made of an organic material, such as at least one of acrylic resin, methacrylic resin, polyisoprene, vinyl resin, epoxy resin, polyurethane resin, cellulose resin, or perylene resin. Those skilled in the art can modify the number of layers, materials, and structure of the encapsulation layer as needed, and the present disclosure is not limited thereto.

[0087] The first functional film 30 is arranged between the light-emitting substrate 10 and the color conversion substrate 20. The first functional film 30 includes a first film layer 31 and a second film layer 32 that are stacked. The second film layer 32 is arranged close to the color conversion substrate 20. The first film layer 31 is a 1 / 4 wave plate for the first light, and the second film layer 32 is a reflective polarizing film for the first light. The second functional film 40 is arranged on the side of the color conversion substrate 20 away from the light-emitting substrate 10. The second functional film 40 includes a third film layer 41 and a fourth film layer 42 that are stacked. The third film layer 41 is arranged close to the color conversion substrate 20. The third film layer 41 is a 1 / 4 wave plate for the second light, and the fourth film layer 42 is a reflective polarizing film for the second light. For example, the first light can be blue light, the first film layer 31 is a 1 / 4 wave plate for blue light, the second film layer 32 is a reflective polarizing film for blue light, the second light can be green light, the third film layer 41 is a 1 / 4 wave plate for green light, and the fourth film layer 42 is a reflective polarizing film for green light; the first light can be blue light, the first film layer 31 is a 1 / 4 wave plate for blue light, the second film layer 32 is a reflective polarizing film for blue light, the second light can be red light, the third film layer 41 is a 1 / 4 wave plate for red light, and the fourth film layer 42 is a reflective polarizing film for red light.

[0088] A quarter-wave plate can convert linearly polarized light into elliptically or circularly polarized light. If the angle between the incident linearly polarized light and the optical axis of the quarter-wave plate is 45 degrees, circular polarization will result. Aligning the optical axes of two quarter-wave plates in the same direction creates the same effect as a half-wave plate. Linearly polarized light remains linearly polarized after passing through the half-wave plate, but its vibration direction changes. If the angle between the incident linearly polarized light and the optical axis of the half-wave plate is 45 degrees, the vibration direction of the linear polarization rotates 90 degrees. Reflective polarizing films are composed of an anisotropic multilayer film module structure, whose material properties are horizontal refractive index anisotropy (such as polymer organic materials). The optical properties of reflective polarizing films are that they can split a beam of natural light into two linearly polarized beams (s-light and p-light) with mutually perpendicular polarization directions. The s-light is completely reflected, while the p-light is completely transmitted, and they exhibit wavelength selectivity.

[0089] In the display module of the embodiment of the present invention, a first functional film 30 and a second functional film 40 are provided on both sides of the color conversion substrate 20. The first light emitted by the light-emitting substrate 10 passes through the first functional film 30. The 1 / 4 wave plate for the first light and the reflective polarizing film for the first light stacked in the first functional film 30 can enable the first light to efficiently illuminate the quantum dots in the color conversion pattern as polarized light. The quantum dots are excited by the first light to emit second light, thereby improving the luminous efficiency of the quantum dots. Since the 1 / 4 wave plate for the second light and the reflective polarizing film for the second light stacked in the second functional film 40 can enable the second light to be emitted as polarized light, there is no need to set a filter, which is beneficial to improving the luminous efficiency of the module and reducing power consumption.

[0090] In some embodiments, as Figure 2 As shown, the display module may further include:

[0091] The third functional film 50 is disposed between the first functional film 30 and the color conversion substrate 20 . The third functional film 50 comprises a reflective polarizing film for the second light. The polarization direction of the third functional film 50 may be the same as that of the second film layer 32 .

[0092] The third film layer 41 acts as a quarter-wave plate for the second light, while the fourth film layer 42 acts as a reflective polarizing film for the second light. Natural light emitted from the color conversion substrate 20 passes through the fourth film layer 42 and the third functional film 50, splitting it into two linearly polarized beams with perpendicular polarization directions. The linearly polarized light aligned with the polarization direction of the fourth film layer 42 is transmitted, while the linearly polarized light perpendicular to the polarization direction of the fourth film layer 42 is reflected. Because the third film layer 41 converts linearly polarized light into elliptically polarized light, the light emitted from the color conversion substrate 20 ultimately passes through the fourth film layer 42 and exits the device, achieving a QD-OLED device without color filter.

[0093] In an embodiment of the present invention, Figures 7 to 9 As shown, the color conversion substrate 20 may include a first color conversion pattern 21 having first quantum dots and a second color conversion pattern 22 having second quantum dots. The first quantum dots are configured to excite first excitation light under the irradiation of the first light, and the second quantum dots are configured to excite second excitation light under the irradiation of the first light. The first excitation light and the second excitation light have different wavelengths. The first excitation light can be red light, and the second excitation light can be green light.

[0094] like Figures 7 to 9 As shown, the third functional film 50 may include a first functional layer 51 corresponding to the first color conversion pattern 21 and a second functional layer 52 corresponding to the second color conversion pattern 22. The first functional layer 51 is a reflective polarizing film for the first excitation light, and the second functional layer 52 is a reflective polarizing film for the second excitation light. For example, the first quantum dots are red quantum dots, the second quantum dots are green quantum dots, and the first light is blue light or ultraviolet light. The first quantum dots are configured to emit red light when irradiated by the first light, and the second quantum dots are configured to emit green light when irradiated by the first light. For example, the third functional film 50 may be a reflective polarizing film for the second light, the first functional layer 51 may be a reflective polarizing film for red light, and the second functional layer 52 may be a reflective polarizing film for green light. Different light sources can be mixed to produce the desired light.

[0095] Optionally, the color conversion substrate 20 may include a third color conversion pattern 23 comprising third quantum dots, configured to emit a third excitation light when irradiated by the first light. The third functional film 50 may include a third functional layer 53 corresponding to the third color conversion pattern 23, with the third functional layer 53 being a reflective polarizing film for the third excitation light. For example, the first quantum dots may be red quantum dots, the second quantum dots may be green quantum dots, and the third quantum dots may be blue quantum dots. The first light may be ultraviolet light. The first quantum dots may be configured to emit red light when irradiated by the first light, the second quantum dots may be configured to emit green light when irradiated by the first light, and the third quantum dots may be configured to emit blue light when irradiated by the first light. For example, the third functional film 50 may be a reflective polarizing film for the second light, the first functional layer 51 may be a reflective polarizing film for red light, the second functional layer 52 may be a reflective polarizing film for green light, and the third functional layer 53 may be a reflective polarizing film for blue light. Different light sources may be mixed to produce the desired light.

[0096] In some embodiments, the area of ​​the third film layer 41 corresponding to the first color conversion pattern 21 is a quarter-wave plate for the first excitation light, and the area of ​​the fourth film layer 42 corresponding to the first color conversion pattern 21 is a reflective polarizing film for the first excitation light, which may be red light; the area of ​​the third film layer 41 corresponding to the second color conversion pattern 22 is a quarter-wave plate for the second excitation light, and the area of ​​the fourth film layer 42 corresponding to the second color conversion pattern 22 is a reflective polarizing film for the second excitation light, which may be green light; the area of ​​the third film layer 41 corresponding to the third color conversion pattern 23 is a quarter-wave plate for the third excitation light, and the area of ​​the fourth film layer 42 corresponding to the third color conversion pattern 23 is a reflective polarizing film for the third excitation light, which may be blue light.

[0097] In an embodiment of the present invention, Figure 2 、 Figures 7 to 9 As shown, the display module may further include:

[0098] The first linear polarizing film 61 can be disposed between the third functional film 50 and the first functional film 30 . The polarization direction of the third functional film 50 can be the same as that of the first linear polarizing film 61 . The first linear polarizing film 61 can reduce the entry of external ambient light.

[0099] Alternatively, as Figure 2 、 Figures 7 to 9 As shown, the display module also includes:

[0100] The second linear polarizing film 62 can be positioned on the side of the second functional film 40 facing away from the color conversion substrate 20. The polarization direction of the second linear polarizing film 62 can be the same as that of the fourth film layer 42; the angle between the polarization direction of the second linear polarizing film 62 and the polarization direction of the first linear polarizing film 61 can be 90 degrees. The second linear polarizing film 62 reduces the amount of ambient light entering the screen. The polarization direction of the second linear polarizing film 62 is perpendicular to that of the first linear polarizing film 61, effectively preventing ambient light reflection. A cover plate 80, which can be a glass cover plate, can be positioned on the side of the second linear polarizing film 62 facing away from the fourth film layer 42 to provide protection.

[0101] In some embodiments, the first film layer 31 is a quarter-wave plate for the first light, the second film layer 32 is a reflective polarizing film for the first light, the third film layer 41 is a quarter-wave plate for the second light, the fourth film layer 42 is a reflective polarizing film for the second light, the third functional film 50 is a reflective polarizing film for the second light, and the first film layer 31 is a quarter-wave plate for the first light. The polarization directions of the second film layer 32, the first linear polarizing film 61, and the third functional film 50 can be the same. The second linear polarizing film 62 and the fourth film layer 42 can have the same polarization direction. The angle between the polarization directions of the second film layer 32 and the fourth film layer 42 can be 90 degrees. The angle between the polarization direction of the second film layer 32 and the optical axis of the first film layer 31 can be 45 degrees. The angle between the polarization directions of the second linear polarizing film 62 and the fourth film layer 42 and the optical axis of the third film layer 41 can be 45 degrees or 135 degrees.

[0102] In this embodiment of the present invention, the second film layer 32 can be a reflective polarizing film for the first light, and the second film layer 32 can be a reflective polarizing film for blue light. Natural light emitted by the light-emitting substrate 10 passes through the second film layer 32 and is split into two beams of linearly polarized light with perpendicular polarization directions. The linearly polarized light aligned with the polarization direction of the second film layer 32 is transmitted through the second film layer 32, while the linearly polarized light perpendicular to the polarization direction of the second film layer 32 is reflected. After passing through the first linear polarizing film 61, the transmitted linearly polarized light is blocked by the second linear polarizing film 62, whose polarization direction is perpendicular to the first linear polarizing film 61. This achieves efficient backlight utilization and zero light leakage in the QD-OLED light-emitting device. The first film layer 31 can be a 1 / 4 wave plate for the first light, and the first electrode 11 can be an anode. The reflected linearly polarized light passes through the first film layer 31 downward once to become circularly polarized light, and then passes through the mirror reflection and half-wave loss of the first electrode 11 to become circularly polarized light with an unchanged polarization direction that propagates upward. It passes through the first film layer 31 upward again and becomes linearly polarized light perpendicular to the initial polarization direction. After passing through the second film layer 32 and the first linear polarizing film 61, it is blocked by the second linear polarizing film 62 perpendicular to the polarization direction of the first linear polarizing film 61, which can achieve efficient utilization of the backlight source and zero light leakage of the QD-OLED light-emitting device, and can achieve a high-efficiency and high color gamut display device structure with almost zero backlight leakage.

[0103] In some embodiments of the present invention, Figure 1 、 Figures 3 to 6 As shown, the display module also includes:

[0104] The third functional film 50 and the fourth functional film 70 are disposed between the first functional film 30 and the color conversion substrate 20, and between the second functional film 40 and the color conversion substrate 20. The third functional film 50 comprises a quarter-wave plate for the first light. The fourth functional film 70 comprises a stacked fifth film layer 71 and a sixth film layer 72. The fifth film layer 71 is disposed adjacent to the color conversion substrate 20 and comprises a quarter-wave plate for the first light. The sixth film layer 72 comprises a reflective polarizing film for the first light. The first light can be blue light, and the second light can be green light; the first light can be blue light, and the second light can be red light. The first light can be ultraviolet light, and the second light can include one or more of red, green, and blue light.

[0105] Optionally, the optical axes of the first film layer 31, the third functional film 50, and the fifth film layer 71 may be aligned. The angle between the optical axis of the first film layer 31 and the polarization direction of the sixth film layer 72 may be 45 degrees. The angle between the polarization direction of the fourth film layer 42 and the optical axis of the third film layer 41 may also be 45 degrees.

[0106] In some embodiments, the optical axis directions of the first film layer 31, the third functional film 50 and the fifth film layer 71 can be the same direction, the polarization directions of the second film layer 32 and the sixth film layer 72 can be the same direction, the angle between the polarization direction of the second film layer 32 and the optical axis direction of the first film layer 31 can be 45 degrees, and the angle between the polarization direction of the fourth film layer 42 and the optical axis direction of the third film layer 41 can be 45 degrees.

[0107] In an embodiment of the present invention, the second film layer 32 can be a reflective polarizing film for the first light, and the second film layer 32 can be a reflective polarizing film for blue light. The natural light emitted by the light-emitting substrate 10 passes through the second film layer 32 and is divided into two beams of linearly polarized light with perpendicular polarization directions. Among them, the linearly polarized light consistent with the polarization direction of the second film layer 32 is transmitted through, and the linearly polarized light perpendicular to the polarization direction of the second film layer 32 is reflected. The first light can be blue light, the third functional film 50 can be a 1 / 4 wave plate for the first light, the fifth film layer 71 can be a 1 / 4 wave plate for the first light, and the sixth film layer 72 can be a reflective polarizing film for the first light. The transmitted linearly polarized light passes through the third functional film 50 and the fifth film layer 71, and the polarization direction is deflected 90 degrees. It is reflected back by the sixth film layer 72, and passes through the fifth film layer 71 and the third functional film 50 again. The polarization direction is deflected 90 degrees again and is reflected by the second film layer 32. This cycle continues, and the linearly polarized light passing through the second film layer 32 will be reflected between the second film layer 32 and the sixth film layer 72 until it is fully absorbed and converted by the quantum dots, thereby achieving efficient utilization of the backlight source and zero light leakage of the QD-OLED light-emitting device. The first electrode 11 can be an anode. The reflected linearly polarized light passes through the first film layer 31 downward once to become circularly polarized light, and then passes through the mirror reflection and half-wave loss of the anode to become circularly polarized light with an unchanged polarization direction that propagates upward. It passes through the first film layer 31 upward again and becomes linearly polarized light perpendicular to the initial polarization direction, passes through the second film layer 32, and is continuously reflected between the second film layer 32 and the sixth film layer 72 until it is fully absorbed and converted by the quantum dots, thereby realizing efficient utilization of the backlight source and zero light leakage of the QD-OLED light-emitting device.

[0108] Natural light emitted by the color conversion substrate 20 passes through the fourth film layer 42 and is split into two beams of linearly polarized light with perpendicular polarization directions. The linearly polarized light aligned with the polarization direction of the fourth film layer 42 is transmitted through the device and emitted out of the device. The linearly polarized light perpendicular to the polarization direction of the fourth film layer 42 is reflected and then passes downward through the third film layer 41 once, becoming circularly polarized light. After further mirror reflection and half-wave loss at the anode, the reflected linearly polarized light propagates upward with the same polarization direction. It then passes upward through the third film layer 41 once more, becoming linearly polarized light perpendicular to its original polarization direction, passing through the fourth film layer 42 and emitting out of the device, thus achieving a QD-OLED light-emitting device without color filter.

[0109] This device structure ensures that only the light emitted by the color conversion substrate 20 is emitted from the device. The first electrode 11 serves as the anode, and the light emitted by the light-emitting substrate 10 is absorbed and converted by the quantum dots, oscillating between the first electrode 11 and the sixth film layer 72. It cannot be emitted from the device. This ensures that the device backlight is fully absorbed and converted, with almost zero light leakage. This eliminates the need for filters, improves efficiency, and reduces overall power consumption.

[0110] In some embodiments, as Figure 1 、 Figures 3 to 6 As shown, the display module may further include:

[0111] The third linear polarizing film 63 can be disposed on the side of the second functional film 40 away from the light-emitting substrate 10. The fourth film layer 42 can have the same polarization direction as the third linear polarizing film 63, allowing light passing through the fourth film layer 42 to pass through the third linear polarizing film 63. This reduces the amount of ambient light entering the film. A cover plate 80 can be disposed on the side of the third linear polarizing film 63 away from the fourth film layer 42 for protection.

[0112] In some embodiments, as Figures 3 to 8 As shown, the color conversion substrate 20 may include a first color conversion pattern 21 having first quantum dots and a second color conversion pattern 22 having second quantum dots. The first quantum dots are configured to emit first excitation light when irradiated by first light, and the second quantum dots are configured to emit second excitation light when irradiated by the first light, with the first excitation light and the second excitation light having different wavelengths. The third film layer 41 includes a first wave plate 411 corresponding to the first color conversion pattern 21 and a second wave plate 412 corresponding to the second color conversion pattern 22. The first wave plate 411 is a quarter-wave plate for the first excitation light, and the second wave plate 412 is a quarter-wave plate for the second excitation light. The fourth film layer 42 includes a first regional layer 421 corresponding to the first color conversion pattern 21 and a second regional layer 422 corresponding to the second color conversion pattern 22. The first regional layer 421 is a reflective polarizing film for the first excitation light, and the second regional layer 422 is a reflective polarizing film for the second excitation light.

[0113] For example, the first quantum dot can be a red light quantum dot, the second quantum dot can be a green light quantum dot, the first light can be blue light or ultraviolet light, the first quantum dot can be configured to excite red light under the irradiation of the first light, and the second quantum dot can be configured to excite green light under the irradiation of the first light. The second light can include one or more of red light, green light, and blue light. The third film layer 41 can be a 1 / 4 wave plate for the second light, and the fourth film layer 42 can be a reflective polarizing film for the second light. The first excitation light can be red light, and the second excitation light can be green light. The first wave plate 411 can be a 1 / 4 wave plate for red light, the second wave plate 412 can be a 1 / 4 wave plate for green light, the first regional layer 421 can be a reflective polarizing film for red light, and the second regional layer 422 can be a reflective polarizing film for green light. Different lights can be mixed into the desired light.

[0114] Optionally, the color conversion substrate 20 may include a third color conversion pattern 23 having third quantum dots; the third quantum dots are configured to excite third excitation light under the irradiation of the first light, and the wavelengths of the first excitation light, the second excitation light and the third excitation light are different; the third film layer 41 includes a third wave plate 413 corresponding to the third color conversion pattern 23, and the third wave plate 413 is a 1 / 4 wave plate for the third excitation light; the fourth film layer 42 includes a third regional layer 423 corresponding to the third color conversion pattern 23, and the third regional layer 423 is a reflective polarization film for the third excitation light, so that different lights can be mixed into the desired light.

[0115] For example, the first quantum dot can be a red light quantum dot, the second quantum dot can be a green light quantum dot, and the third quantum dot can be a blue light quantum dot. The first light can be ultraviolet light. The first quantum dot can be configured to excite red light under the irradiation of the first light, the second quantum dot can be configured to excite green light under the irradiation of the first light, and the third quantum dot can be configured to excite blue light under the irradiation of the first light. The third film layer 41 can be a 1 / 4 wave plate for the second light, and the fourth film layer 42 can be a reflective polarizing film for the second light. The first excitation light can be red light, the second excitation light can be green light, and the third excitation light can be blue light. The first wave plate 411 can be a 1 / 4 wave plate for red light, the second wave plate 412 can be a 1 / 4 wave plate for green light, and the third wave plate 413 can be a 1 / 4 wave plate for blue light; the first regional layer 421 can be a reflective polarizing film for red light, the second regional layer 422 can be a reflective polarizing film for green light, and the third regional layer 423 can be a reflective polarizing film for blue light. Different lights can be mixed into the desired light.

[0116] In some embodiments, the area of ​​the third film layer 41 corresponding to the first color conversion pattern 21 is a quarter-wave plate for the first excitation light, and the area of ​​the fourth film layer 42 corresponding to the first color conversion pattern 21 is a reflective polarizing film for the first excitation light. The first excitation light can be red light; the area of ​​the third film layer 41 corresponding to the second color conversion pattern 22 is a quarter-wave plate for the second excitation light, and the area of ​​the fourth film layer 42 corresponding to the second color conversion pattern 22 is a reflective polarizing film for the second excitation light. The second excitation light can be green light; the area of ​​the third film layer 41 corresponding to the third color conversion pattern 23 is a quarter-wave plate for the third excitation light, and the area of ​​the fourth film layer 42 corresponding to the third color conversion pattern 23 is a reflective polarizing film for the third excitation light. The third excitation light can be blue light. Different lights can be mixed to form the desired light.

[0117] like Figure 3 、 Figure 7As shown, the first color conversion pattern 21 comprises first quantum dots, the second color conversion pattern 22 comprises second quantum dots, and the third color conversion pattern 23 comprises third quantum dots. The first light-emitting layer 131, the second light-emitting layer 132, and the third light-emitting layer 133 can emit ultraviolet light. The first light can be ultraviolet light. The first quantum dots can be configured to emit red light when excited by the first light, the second quantum dots can be configured to emit green light when excited by the first light, and the third quantum dots can be configured to emit blue light when excited by the first light. The first excitation light can be red light, the second excitation light can be green light, and the third excitation light can be blue light. The first wave plate 411 can be a quarter-wave plate for red light, the second wave plate 412 can be a quarter-wave plate for green light, and the third wave plate 413 can be a quarter-wave plate for blue light. The first region layer 421 can be a reflective polarizing film for red light, the second region layer 422 can be a reflective polarizing film for green light, and the third region layer 423 can be a reflective polarizing film for blue light. Different light sources can be mixed to produce the desired light. A cover plate 80 may be disposed on a side of the third linear polarizing film 63 away from the fourth film layer 42 , and the cover plate 80 may provide protection.

[0118] exist Figure 3 In the figure, the first film layer 31 is a quarter wave plate for the first light, the second film layer 32 is a reflective polarizing film for the first light, the third functional film 50 is a quarter wave plate for the first light, the fifth film layer 71 is a quarter wave plate for the first light, and the sixth film layer 72 is a reflective polarizing film for the first light. Figure 7 In the figure, the first film layer 31 is a quarter-wave plate for the first light, the second film layer 32 is a reflective polarizing film for the first light, and the third functional film 50 includes a first functional layer 51 corresponding to the first color conversion pattern 21, a second functional layer 52 corresponding to the second color conversion pattern 22, and a third functional layer 53 corresponding to the third color conversion pattern 23. The first functional layer 51 can be a reflective polarizing film for the first excitation light, the second functional layer 52 can be a reflective polarizing film for the second excitation light, and the third functional layer 53 can be a reflective polarizing film for the third excitation light. The first excitation light can be red light, the second excitation light can be green light, and the third excitation light can be blue light.

[0119] like Figure 4 、 Figure 8As shown, first color conversion pattern 21 comprises first quantum dots, second color conversion pattern 22 comprises second quantum dots, and third color conversion pattern 23 comprises third quantum dots. First and second light-emitting layers 131 and 132 can emit blue light, while third light-emitting layer 133 can emit ultraviolet light. The first light emitted by first and second light-emitting layers 131 and 132 can be blue light, while the first light emitted by third light-emitting layer 133 can be ultraviolet light. The first quantum dots can be configured to emit red light when irradiated by the first light, the second quantum dots can be configured to emit green light when irradiated by the first light, and the third quantum dots can be configured to emit blue light when irradiated by the first light. The first excitation light can be red light, the second excitation light can be green light, and the third excitation light can be blue light. The first wave plate 411 can be a 1 / 4 wave plate for red light, the second wave plate 412 can be a 1 / 4 wave plate for green light, and the third wave plate 413 can be a 1 / 4 wave plate for blue light; the first regional layer 421 can be a reflective polarizing film for red light, the second regional layer 422 can be a reflective polarizing film for green light, and the third regional layer 423 can be a reflective polarizing film for blue light. Different lights can be mixed into the required light.

[0120] exist Figure 4 In the figure, the first film layer 31 is a quarter wave plate for the first light, the second film layer 32 is a reflective polarizing film for the first light, the third functional film 50 is a quarter wave plate for the first light, the fifth film layer 71 is a quarter wave plate for the first light, and the sixth film layer 72 is a reflective polarizing film for the first light. Figure 8 In the figure, the first film layer 31 is a quarter-wave plate for the first light, the second film layer 32 is a reflective polarizing film for the first light, and the third functional film 50 may include a first functional layer 51 corresponding to the first color conversion pattern 21, a second functional layer 52 corresponding to the second color conversion pattern 22, and a third functional layer 53 corresponding to the third color conversion pattern 23. The first functional layer 51 may be a reflective polarizing film for the first excitation light, the second functional layer 52 may be a reflective polarizing film for the second excitation light, and the third functional layer 53 may be a reflective polarizing film for the third excitation light. The first excitation light may be red light, the second excitation light may be green light, and the third excitation light may be blue light.

[0121] like Figure 5 、 Figure 6 、 Figure 9As shown, the first color conversion pattern 21 has a first quantum dot, and the second color conversion pattern 22 has a second quantum dot. The first light-emitting layer 131, the second light-emitting layer 132 and the third light-emitting layer 133 can emit blue light, and the first light emitted by the first light-emitting layer 131, the second light-emitting layer 132 and the third light-emitting layer 133 can be blue light. The first quantum dot can be configured to excite red light under the irradiation of the first light, and the second quantum dot can be configured to excite green light under the irradiation of the first light. The first excitation light can be red light, and the second excitation light can be green light. The first wave plate 411 can be a 1 / 4 wave plate for red light, and the second wave plate 412 can be a 1 / 4 wave plate for green light; the first regional layer 421 can be a reflective polarizing film for red light, and the second regional layer 422 can be a reflective polarizing film for green light, and different lights can be mixed into the required light. Figure 5 In the embodiment, by disposing the second film layer 32, the first film layer 31 and the third linear polarization film 63 in the area corresponding to the third light emitting layer 133, the reflection of ambient light can be prevented, and the efficiency of blue light can be improved. Figure 5 In the embodiment, a filling layer 19 may be provided between the second film layer 32 and the third linear polarizing film 63 and in the region corresponding to the third light emitting layer 133. The filling layer 19 may be a light-transmitting material and may fill the space between the second film layer 32 and the third linear polarizing film 63. Figure 6 In the embodiment, a filling layer 19 may be provided between the first film layer 31 and the third linear polarizing film 63 and in the region corresponding to the third light emitting layer 133. The filling layer 19 may be a light-transmitting material and may fill the space between the first film layer 31 and the third linear polarizing film 63. Figure 9 In the embodiment, a filling layer 19 may be provided between the first linear polarizing film 61 and the second linear polarizing film 62 and in the region corresponding to the third light emitting layer 133 . The filling layer 19 may be a light-transmitting material and may fill the space between the first linear polarizing film 61 and the second linear polarizing film 62 .

[0122] exist Figure 5 and Figure 6 In the figure, the first film layer 31 is a quarter wave plate for the first light, the second film layer 32 is a reflective polarizing film for the first light, the third functional film 50 is a quarter wave plate for the first light, the fifth film layer 71 is a quarter wave plate for the first light, and the sixth film layer 72 is a reflective polarizing film for the first light. Figure 9In the example, the first film layer 31 is a quarter-wave plate for the first light, the second film layer 32 is a reflective polarizing film for the first light, and the third functional film 50 includes a first functional layer 51 corresponding to the first color conversion pattern 21 and a second functional layer 52 corresponding to the second color conversion pattern 22. The first functional layer 51 can be a reflective polarizing film for the first excitation light, and the second functional layer 52 can be a reflective polarizing film for the second excitation light. The first excitation light can be red, and the second excitation light can be green. The first film layer 31, the second film layer 32, the first linear polarizing film 61, and the second linear polarizing film 62 can cover the area corresponding to the third luminescent layer 133. The second linear polarizing film 62 reduces the entry of external ambient light. The polarization direction of the second linear polarizing film 62 is perpendicular to that of the first linear polarizing film 61, effectively preventing ambient light reflection.

[0123] The display device according to the embodiment of the present invention includes the display module described in the above embodiment. The display device including the display module according to the above embodiment has high luminous efficiency and can reduce power consumption.

[0124] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are protected by the present invention.

Claims

1. A display module, characterized in that: include: a light-emitting substrate having a light-emitting device configured to emit a first light; a color conversion substrate, the color conversion substrate including a color conversion pattern, the color conversion pattern including quantum dots; The quantum dots are configured to excite second light under the irradiation of the first light; a first functional film, the first functional film being disposed between the light-emitting substrate and the color conversion substrate, the first functional film comprising a first film layer and a second film layer stacked together, the second film layer being disposed adjacent to the color conversion substrate, the first film layer being a quarter-wave plate for the first light, and the second film layer being a reflective polarizing film for the first light; A second functional film is arranged on a side of the color conversion substrate away from the light-emitting substrate. The second functional film includes a third film layer and a fourth film layer stacked together. The third film layer is arranged close to the color conversion substrate. The third film layer is a 1 / 4 wave plate for the second light, and the fourth film layer is a reflective polarizing film for the second light.

2. The display module according to claim 1, wherein: Also includes: A third functional film is provided between the first functional film and the color conversion substrate. The third functional film comprises a reflective polarizing film for the second light. The polarization direction of the third functional film is the same as that of the second film layer.

3. The display module according to claim 2, wherein: The color conversion substrate includes a first color conversion pattern having first quantum dots and a second color conversion pattern having second quantum dots; The first quantum dot is configured to emit a first excitation light under the irradiation of the first light; The second quantum dot is configured to emit a second excitation light under the irradiation of the first light, and the wavelength of the first excitation light is different from that of the second excitation light; The third functional film includes a first functional layer corresponding to the first color conversion pattern and a second functional layer corresponding to the second color conversion pattern. The first functional layer is a reflective polarizing film for the first excitation light, and the second functional layer is a reflective polarizing film for the second excitation light.

4. The display module according to claim 3, wherein: The color conversion substrate includes a third color conversion pattern including third quantum dots; The third quantum dot is configured to excite a third excitation light under the irradiation of the first light; The third functional film includes a third functional layer corresponding to the third color conversion pattern, and the third functional layer is a reflective polarizing film for the third excitation light.

5. The display module according to claim 4, wherein: The area of ​​the third film layer corresponding to the first color conversion pattern is a quarter-wave plate for the first excitation light, and the area of ​​the fourth film layer corresponding to the first color conversion pattern is a reflective polarizing film for the first excitation light; The area of ​​the third film layer corresponding to the second color conversion pattern is a quarter-wave plate for the second excitation light, and the area of ​​the fourth film layer corresponding to the second color conversion pattern is a reflective polarizing film for the second excitation light; The area of ​​the third film layer corresponding to the third color conversion pattern is a quarter wave plate for the third excitation light, and the area of ​​the fourth film layer corresponding to the third color conversion pattern is a reflective polarizing film for the third excitation light.

6. The display module according to claim 2, wherein: Also includes: A first linear polarizing film is disposed between the third functional film and the first functional film, and a polarization direction of the third functional film is the same as that of the first linear polarizing film.

7. The display module according to claim 6, wherein: Also includes: a second linear polarizing film, the second linear polarizing film being disposed on a side of the second functional film away from the color conversion substrate, the polarization direction of the second linear polarizing film being the same as the polarization direction of the fourth film layer; The angle between the polarization direction of the second linear polarizing film and the polarization direction of the first linear polarizing film is 90 degrees.

8. The display module according to claim 1, wherein: Also includes: a third functional film and a fourth functional film, wherein the third functional film is disposed between the first functional film and the color conversion substrate, and the fourth functional film is disposed between the second functional film and the color conversion substrate; The third functional film includes a quarter wave plate for the first light; The fourth functional film includes a fifth film layer and a sixth film layer stacked together. The fifth film layer is disposed close to the color conversion substrate. The fifth film layer includes a quarter wave plate for the first light. The sixth film layer includes a reflective polarizing film for the first light.

9. The display module according to claim 8, wherein: The optical axes of the first film layer, the third functional film and the fifth film layer are in the same direction; and / or The angle between the optical axis direction of the first film layer and the polarization direction of the sixth film layer is 45 degrees.

10. The display module according to claim 8, wherein: The angle between the polarization direction of the fourth film layer and the optical axis direction of the third film layer is 45 degrees.

11. The display module according to claim 8, wherein: Also includes: A third linear polarizing film is provided on a side of the second functional film away from the light-emitting substrate, and a polarization direction of the fourth film layer is the same as that of the third linear polarizing film.

12. The display module according to claim 8, wherein: The color conversion substrate includes a first color conversion pattern having first quantum dots and a second color conversion pattern having second quantum dots; The first quantum dot is configured to emit a first excitation light under the irradiation of the first light; The second quantum dot is configured to emit a second excitation light under the irradiation of the first light, and the wavelength of the first excitation light is different from that of the second excitation light; The third film layer includes a first wave plate corresponding to the first color conversion pattern and a second wave plate corresponding to the second color conversion pattern, the first wave plate is a quarter wave plate for the first excitation light, and the second wave plate is a quarter wave plate for the second excitation light; The fourth film layer includes a first region layer corresponding to the first color conversion pattern and a second region layer corresponding to the second color conversion pattern. The first region layer is a reflective polarizing film for the first excitation light, and the second region layer is a reflective polarizing film for the second excitation light.

13. The display module according to claim 12, wherein: The color conversion substrate includes a third color conversion pattern including third quantum dots; The third quantum dot is configured to excite a third excitation light under the irradiation of the first light; The first excitation light, the second excitation light and the third excitation light have different wavelengths; The third film layer includes a third wave plate corresponding to the third color conversion pattern, and the third wave plate is a quarter wave plate for the third excitation light; The fourth film layer includes a third region layer corresponding to the third color conversion pattern, and the third region layer is a reflective polarizing film for the third excitation light.

14. The display module according to claim 13, wherein: The area of ​​the third film layer corresponding to the first color conversion pattern is a quarter-wave plate for the first excitation light, and the area of ​​the fourth film layer corresponding to the first color conversion pattern is a reflective polarizing film for the first excitation light; The area of ​​the third film layer corresponding to the second color conversion pattern is a quarter-wave plate for the second excitation light, and the area of ​​the fourth film layer corresponding to the second color conversion pattern is a reflective polarizing film for the second excitation light; The area of ​​the third film layer corresponding to the third color conversion pattern is a quarter wave plate for the third excitation light, and the area of ​​the fourth film layer corresponding to the third color conversion pattern is a reflective polarizing film for the third excitation light.

15. A display device, characterized in that: A display module comprising any one of claims 1-14.

Images