Display module and display device
By spacing the quantum dot layer and the backlight assembly in the display module and using a transflective film and a reflective layer to reflect light multiple times, the problem of the quantum dot film layer's performance deteriorating due to heat generation light source is solved, improving the light efficiency and brightness of the display module, while protecting the quantum dot layer from water and oxygen erosion.
Patent Information
- Application Number
- CN202423261610.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-27
AI Technical Summary
Existing quantum dot films are easily affected by the heat source due to their proximity to the light source, leading to a decline in performance.
The quantum dot layer is spaced apart from the backlight assembly, and a transflective film and a reflective layer are introduced into the polarizer. The light is reflected multiple times through the transflective film and the reflective layer to excite the quantum dot particles, thereby increasing the distance between the quantum dot layer and the light source and avoiding the influence of heat.
The light efficiency of the quantum dot layer was improved, the brightness and color gamut of the display module were enhanced, the water and oxygen erosion of the quantum dot layer was reduced, the film structure was simplified, and the thickness was reduced.
Smart Images
Figure CN223692607U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of display, in particular to a display module and a display device. BACKGROUND
[0002] With the continuous development and progress of display technology, liquid crystal display (LCD) has become the most mature and widely used display technology on the market. The existing liquid crystal display technology mainly relies on LED as a backlight source. Since the light spectrum of LED fluorescent powder and the transmission spectrum of color filter (CF) are relatively wide, most of the color gamut of LCD displays can only reach about 72% NTSC color gamut, and the color performance is poor. Recently, due to the narrow emission spectrum, easy control of emission spectrum, high quantum yield and wide color gamut (more than 120% NTSCS color gamut) of quantum dots, quantum dots have become the mainstream material of the next generation of liquid crystal backlights. In the traditional quantum dot backlight module structure, the application form of quantum dots mainly includes quantum dot (QD) film and quantum dot LED, but the quantum dot products in these two application forms all have the problem of poor heat resistance. CONTENT OF THE INVENTION
[0003] The display module and the display device provided by the embodiments of the present application solve the problem that the heat generated by the light source affects the performance of the quantum dot film layer.
[0004] In order to achieve the above-mentioned purpose, according to the first aspect of the present application, a display module is provided, comprising:
[0005] a display panel, the display panel has a display side and a back side arranged oppositely; and
[0006] an upper polarizing plate, the upper polarizing plate is arranged on the display side of the display panel;
[0007] a lower polarizing plate, the lower polarizing plate is arranged on the back side of the display panel, and in the direction away from the display panel, the lower polarizing plate at least comprises a bonding layer, a first protective layer and a polarization layer arranged in layers;
[0008] a backlight assembly, the backlight assembly is arranged on the side of the lower polarizing plate away from the display panel;
[0009] wherein the lower polarizing plate further comprises a quantum dot layer, the quantum dot layer is arranged on the side of the polarization layer facing the backlight assembly, and the quantum dot layer is arranged spaced apart from the backlight assembly.
[0010] In an embodiment, the lower polarizing plate further comprises a second protective layer, the second protective layer is arranged on the side of the polarization layer facing the backlight assembly;
[0011] The quantum dot layer is arranged between the polarizing layer and the second protective layer.
[0012] In an embodiment, the edge of the quantum dot layer is arranged inwardly relative to the edge of the second protective layer.
[0013] A sealing layer is arranged between the polarizing layer and the second protective layer, and the sealing layer is arranged around the outer periphery of the quantum dot layer.
[0014] In an embodiment, the backlight assembly includes a reflective layer, and a reflective surface of the reflective layer is arranged toward the display panel.
[0015] The display module further includes a transflective film arranged on a side of the quantum dot layer facing the backlight assembly, the transflective film is arranged spaced apart from the backlight assembly, and light emitted from the backlight assembly is partially transmitted through the transflective film and partially reflected by the transflective film to the reflective layer.
[0016] In an embodiment, the transflective film transmits first light emitted from the backlight assembly and reflects second light emitted from the backlight assembly, and the polarization directions of the first light and the second light are different.
[0017] In an embodiment, the transflective film is arranged as a reflective polarizer or a dual brightness enhancement film.
[0018] In an embodiment, the material of the quantum dot layer includes water glue and quantum dot particles arranged in a mixed manner.
[0019] In an embodiment, the mixing ratio of the quantum dot particles to the water glue is arranged as 1%:99%.
[0020] In an embodiment, the backlight assembly includes:
[0021] A light guide plate arranged on a side of the quantum dot layer away from the display panel, the light guide plate is arranged spaced apart from the quantum dot layer, a side portion of the light guide plate is arranged as a light entrance side, and a side of the light guide plate facing the quantum dot layer is arranged as a light exit side;
[0022] A light source arranged on the light entrance side of the light guide plate;
[0023] An optical film layer arranged on the light exit side of the light guide plate and between the light guide plate and the quantum dot layer, the optical film layer is arranged spaced apart from the quantum dot layer; and
[0024] A reflective layer arranged on a side of the light guide plate away from the optical film layer.
[0025] According to a second aspect of the present application, a display device is provided, comprising the display module as described above.
[0026] In the display module of the embodiments of the present application, the upper polarizer is arranged on the display side of the display panel, and the lower polarizer is arranged on the back side of the display panel; in the direction away from the display panel, the lower polarizer at least comprises a bonding layer, a first protective layer and a polarization layer arranged in layers; and the lower polarizer further comprises a quantum dot layer, which is arranged on the side of the polarization layer facing the backlight assembly and is spaced apart from the backlight assembly; after the light emitted by the backlight assembly reaches the quantum dot layer, the quantum dot particles in the quantum dot layer will be excited, thereby ensuring the light efficiency of the display module; at the same time, since the light source of the backlight assembly will generate a large amount of heat as the use time increases, therefore, by compounding the quantum dot layer to the polarizer and spacing the quantum dot layer from the backlight assembly, the distance between the quantum dot layer and the light source can be increased, thereby avoiding the influence of the heated light source on the performance of the quantum dot layer.
[0027] Other features and advantages of the present application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS
[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.
[0029] In order to more completely understand the present application and its beneficial effects, the following will be described in conjunction with the drawings, wherein the same reference numerals in the following description represent the same parts.
[0030] Figure 1 A schematic diagram of the film layer of the display module provided by the prior art;
[0031] Figure 2 A schematic diagram of the film layer of the display module provided by the embodiments of the present application;
[0032] Figure 3 A first schematic diagram of the film layer of the display panel (quantum dot layer) provided by the embodiments of the present application;
[0033] Figure 4 A second schematic diagram of the film layer of the display panel (quantum dot layer) provided by the embodiments of the present application;
[0034] Figure 5 A third schematic diagram of the film layer of the display panel (quantum dot layer) provided by the embodiments of the present application. DETAILED DESCRIPTION
[0035] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort are within the protection scope of the present application.
[0036] The present application provides a display module 100 and a display device. The following will be described in detail. It should be noted that the description order of the following embodiments is not limited as the preferred order of the embodiments.
[0037] The display device provided by the embodiments of the present application can be applied to electronic devices, which can be a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, a vehicle-mounted display, and can also be a wearable device or any product or component with a display function, such as a smart watch, a smart bracelet, smart glasses, smart earphones, smart clothing, a head-mounted display, etc.
[0038] In a first aspect, the present application provides a display module 100, which comprises a display panel 1, an upper polarizing plate 21, a lower polarizing plate 22, and a backlight assembly 3. The display panel 1 has a display side 11 and a back side 12 arranged oppositely. The upper polarizing plate 21 is arranged on the display side 11 of the display panel 1, and the lower polarizing plate 22 is arranged on the back side 12 of the display panel 1. In a direction away from the display panel 1, the lower polarizing plate 22 comprises at least a bonding layer 221, a first protective layer 222, and a polarizing layer 223 arranged in a stack. The backlight assembly 3 is located on the back side 12 of the display panel 1 and arranged on a side of the polarizing plate 2 away from the display panel 1. The lower polarizing plate 22 further comprises a quantum dot layer 224 arranged on a side of the polarizing layer 223 facing the backlight assembly 3, and the quantum dot layer 224 is arranged apart from the backlight assembly 3.
[0039] In the prior art, please refer to Figure 1The backlight assembly 3' includes a light source 31', a light guide plate 32', an optical film layer 33', and a reflective layer 34'. The quantum dot film layer 224' is arranged on the light source 31' or the optical film layer 33'. Light emitted by the light source 31' reaches the quantum dot film layer 224', excites quantum dot particles in the quantum dot film layer 224', and then exits through the light guide plate 32' and the optical film layer 33' in sequence, and then passes through the lower polarizing plate 22', the display panel 1', and the upper polarizing plate 21' in sequence. In this way, the light efficiency of the display module 100' can be improved. However, the light source 31' of the backlight assembly 3' generates a large amount of heat as the use time increases. Since the quantum dot film layer 224' is close to the light source 31', the heated light source 31' affects the performance of the quantum dot film layer 224'.
[0040] In the embodiments of the present application, please refer to Figures 2 to 5 The lower polarizing plate 22 further includes a quantum dot layer 224 arranged on a side of the polarizing layer 223 facing the backlight assembly 3. The quantum dot layer 224 is arranged apart from the backlight assembly 3. Light emitted by the backlight assembly 3 reaches the quantum dot layer 224, excites quantum dot particles in the quantum dot layer 224, and thus guarantees the light efficiency of the display module 100. Since the light source 31 of the backlight assembly 3 generates a large amount of heat as the use time increases, the quantum dot layer 224 is combined into the polarizing plate 2 and arranged apart from the backlight assembly 3. In this way, the distance between the quantum dot layer 224 and the light source 31 is increased, and thus the heated light source 31 does not affect the performance of the quantum dot layer 224.
[0041] The present application does not make specific limitations on the form of the light source 31. In an embodiment, the light source 31 is arranged as an LED lamp bead.
[0042] Please refer to Figure 3 In the first embodiment of the present application, the polarizing plate 2 further includes a second protective layer 225 arranged on a side of the polarizing layer 223 facing the backlight assembly 3. The quantum dot layer 224 is arranged between the polarizing layer 223 and the second protective layer 225.
[0043] It can be known that the polarizer generally comprises the adhesive layer 221, the first protective layer 222, the polarization layer 223 and the second protective layer 225 which are arranged in a stack; the polarization layer 223 is generally made of a polyvinyl alcohol (PVA) film which is stretched and then absorbs iodine or other dichroic dyes; the dye molecules are arranged along the stretching direction, so as to realize the polarization effect; the first protective layer 222 and the second protective layer 225 protect the polarization layer 223 from being damaged; the first protective layer 222 and the second protective layer 225 can be a triacetate cellulose (TAC) film or a polyethylene terephthalate (PET); the first protective layer 222 is adhered to the display panel 1 through the adhesive layer 221.
[0044] The quantum dot layer 224 is arranged between the polarization layer 223 and the second protective layer 225, so as not to damage the original structure of the lower polarizer 22; meanwhile, the second protective layer 225 can protect the quantum dot layer 224 from water and oxygen corrosion.
[0045] It should be noted that the film layer structure of the upper polarizer 21 and the lower polarizer 22 is partially the same, and both comprise the adhesive layer 221, the first protective layer 222, the polarization layer 223 and the second protective layer 225 which are arranged in a stack.
[0046] Please refer to Figure 4 In the second embodiment of the present application, the edge of the quantum dot layer 224 is arranged in a recessed manner compared with the edge of the second protective layer 225; the sealing layer 226 is arranged between the polarization layer 223 and the second protective layer 225, and is arranged around the outer periphery of the quantum dot layer 224.
[0047] In the second embodiment, the difference from the first embodiment is that the edge of the quantum dot layer 224 is recessed, and the sealing layer 226 is arranged around the outer periphery of the quantum dot layer 224; it can be known that the second protective layer 225 protects the quantum dot layer 224 from the front side, but the side of the quantum dot layer 224 is in a bare state; by arranging the edge of the quantum dot layer 224 in a recessed manner and arranging the sealing layer 226 around the outer periphery of the quantum dot layer 224, the side of the quantum dot layer 224 is sealed, so as to protect the quantum dot layer 224 from water and oxygen corrosion from the side.
[0048] Please refer to Figure 5In the third embodiment of the present application, the backlight assembly 3 comprises a reflective layer 34, a reflective surface of the reflective layer 34 is arranged towards the display panel 1; the display module 100 further comprises a transflector 4, the transflector 4 is arranged on a side of the quantum dot layer 224 facing the backlight assembly 3, light rays emitted from the backlight assembly 3 are partially transmitted through the transflector 4 and partially reflected by the transflector 4 to the reflective layer 34.
[0049] In the third embodiment, the difference from the first embodiment is that the transflector 4 is arranged on a side of the quantum dot layer 224 facing the backlight assembly 3; light rays emitted from the light source 31 of the backlight assembly 3 are partially transmitted through the transflector 4 into the quantum dot layer 224 to excite quantum dot particles in the quantum dot layer 224; light rays emitted from the light source 31 of the backlight assembly 3 are partially reflected by the transflector 4 and reflected to the reflective layer 34, and the light rays reflected by the reflective surface of the reflective layer 34 enter the quantum dot layer 224 to excite quantum dot particles; in this way, the light rays are reflected multiple times between the transflector 4 and the reflective layer 34, so that the light rays enter the quantum dot layer 224 multiple times to excite quantum dot particles, thereby improving the excitation efficiency of quantum dot particles in the quantum dot layer 224 and improving the light efficiency of the display module 100.
[0050] Specifically, the transflector 4 transmits first light rays emitted from the backlight assembly 3 and reflects second light rays emitted from the backlight assembly 3, the polarization directions of the first light rays and the second light rays are different.
[0051] The present application does not make specific limitations on the form of the transflector 4. Preferably, the transflector 4 is arranged as a reflective polarizer or a dual brightness enhancement film. That is, the transflector 4 can be arranged as an APF (English full name: Reflective Polarizer, Chinese abbreviation: reflective polarizer); the APF polarizer is in a transmission mode, when light rays are incident within a specific angle range, the APF polarizer allows these light rays to pass through and these light rays are polarized; the APF polarizer is in a reflection mode, when light rays are incident within other angle ranges, the APF polarizer reflects these light rays instead of allowing them to pass through, and these reflected light rays can be reused, for example, reflected again in the backlight assembly 3, thereby improving the utilization rate of backlight.
[0052] And, when the transflective film 4 can be provided as an APF, since the APF has a PET protective film layer, the lower polarizer 22 can share the PET protective film layer with the APF, and the PET protective film layer can also protect the quantum dot layer 224 from water and oxygen corrosion; at the same time, using the APF can make the lower polarizer 22 reduce a layer of PET protective film layer, thereby simplifying the film layer structure of the display module 100 and reducing the thickness of the display module 100.
[0053] The transflective film 4 can also be provided as a DBEF (English full name: Dual Brightness Enhancement Film, Chinese abbreviation: double brightness enhancement film). When the DBEF is in a transmission mode, it can pass light rays within a specific angle range, which are usually polarized light rays. When the DBEF is in a reflection mode, it reflects light rays within other angle ranges, which can be reused, for example, in the backlight assembly 3. For example, the DBEF transmits P-polarized light while reflecting S-polarized light to the backlight assembly 3. After the S-polarized light passes through the diffuser and the reflector of the backlight assembly 3 in turn, the light rays can be reused. Such multiple cycles increase the brightness of the display panel 1 by about 60%.
[0054] The material of the quantum dot layer 224 is not limited in the present application. The material of the quantum dot layer 224 includes mixed water glue and quantum dot particles. In combination with the above embodiment, the water glue and the quantum dot particles are mixed uniformly, coated on the polarizing layer 223, and laminated with the second protective layer 225 on the polarizing layer 223. The coating is cured by UV, thereby setting the quantum dot layer 224 between the polarizing layer 223 and the second protective layer 225.
[0055] The mixing ratio of the quantum dot particles and the water glue is not limited in the present application. Preferably, the mixing ratio of the quantum dot particles and the water glue is set to 1%:99%.
[0056] In an embodiment, please refer to Figure 2The backlight assembly 3 comprises a light source 31, a light guide plate 32, an optical film layer 33 and a reflective layer 34. The light guide plate 32 is arranged on a side of the quantum dot layer 224 away from the display panel 1. The light guide plate 32 is arranged apart from the quantum dot layer 224. A side of the light guide plate 32 is arranged as a light-in side. A side of the light guide plate 32 facing the quantum dot layer 224 is arranged as a light-out side. The light source 31 is arranged on the light-in side of the light guide plate 32. The optical film layer 33 is arranged on the light-out side of the light guide plate 32 and between the light guide plate 32 and the quantum dot layer 224. The optical film layer 33 is arranged apart from the quantum dot layer 224. The reflective layer 34 is arranged on a side of the light guide plate 32 away from the optical film layer 33.
[0057] In a second aspect, the embodiments of the present application provide a display device. The display device comprises the display module 100. It should be noted that the display module 100 is the display module 100 described above, that is, the display module 100 comprises all the technical features of the display module 100 described above, and the display device comprises all the embodiments of the display module 100 described above, and thus has all the technical effects of the embodiments described above, which will not be repeated here.
[0058] In the description of the present application, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.
[0059] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.
[0060] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.
[0061] The above is only the preferred embodiments of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, still falls within the scope of the technical solution of the present application.
Claims
1. A display module, characterized by The display module comprises: a display panel having a display side and a back side arranged oppositely; an upper polarizer arranged on the display side of the display panel; a lower polarizer arranged on the back side of the display panel, the lower polarizer comprising at least an adhesive layer, a first protective layer and a polarization layer arranged in a stack in a direction away from the display panel; a backlight assembly arranged on a side of the lower polarizer away from the display panel; wherein the lower polarizer further comprises a quantum dot layer arranged on a side of the polarization layer facing the backlight assembly, and the quantum dot layer is arranged spaced apart from the backlight assembly. The lower polarizer further comprises a second protective layer arranged on a side of the polarization layer facing the backlight assembly; 2. The display module of claim 1, wherein, wherein the quantum dot layer is arranged between the polarization layer and the second protective layer. An edge of the quantum dot layer is arranged inwardly relative to an edge of the second protective layer.
3. The display module of claim 2, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. A sealing layer is arranged between the polarization layer and the second protective layer, and the sealing layer is arranged around an outer periphery of the quantum dot layer. The backlight assembly comprises a reflective layer, and a reflective surface of the reflective layer is arranged facing the display panel.
4. The display module of claim 1, wherein, The display module further comprises a transflector arranged on a side of the quantum dot layer facing the backlight assembly, and the transflector is arranged spaced apart from the backlight assembly, and light emitted from the backlight assembly is partially transmitted through the transflector and partially reflected by the transflector to the reflective layer. The transflector transmits first light emitted from the backlight assembly and reflects second light emitted from the backlight assembly, and the polarization directions of the first light and the second light are different.
5. The display module of claim 4, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The transflector is arranged as a reflective polarizer or a dual brightness enhancement film.
6. The display module of claim 5, wherein the display module is configured to be mounted to a display module mounting surface of a display module mounting structure. The backlight assembly comprises:
7. The display module of claim 1, wherein the display module is configured to be mounted on a display stand. a light guide plate arranged on a side of the quantum dot layer away from the display panel, and the light guide plate is arranged spaced apart from the quantum dot layer, a side of the light guide plate is arranged as a light entrance side, and a side of the light guide plate facing the quantum dot layer is arranged as a light exit side; a light source arranged on the light entrance side of the light guide plate; an optical film layer arranged on the light exit side of the light guide plate and between the light guide plate and the quantum dot layer, and the optical film layer is arranged spaced apart from the quantum dot layer; and a reflective layer arranged on a side of the light guide plate away from the optical film layer. The display module comprises any one of the display modules according to claims 1-7.
8. A display device, characterized by comprising: