Display module and display device

Abstract

The embodiment of the utility model provides a display module and a display device, the display module comprises a display panel and a backlight assembly arranged on one side of the display panel; the backlight assembly comprises a light source plate, a first diffusion plate and a first quantum dot film. The light source plate is arranged on one side of the display panel and is spaced from the display panel; the first diffusion plate is arranged between the display panel and the light source plate, and the first diffusion plate and the display panel are stacked; the first quantum dot film is arranged between the first diffusion plate and the light source plate, and the first quantum dot film and the first diffusion plate are arranged at intervals; the first diffusion plate is used for converting blue light emitted by the light source plate so that the backlight assembly can emit white light to the display panel from the first diffusion plate, even if the first composite film generates blue edges, light converted through an effective area of the first composite film and the blue light directly emitted from a failure area of the first composite film can be mixed to form the white light under the light mixing effect of the first diffusion plate. Therefore, the phenomenon that the edge of the display picture is blued is reduced, and the display effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of display technology, in particular to a display module and a display device. Background Art

[0002] With the rapid development of electronic technology, narrow borders have become the development trend of display devices. The display module in the related art includes a display panel, and a QD film (Quantum Dot Film) is adhered to the non-display side of the display panel. The edge of the QD film is susceptible to water and oxygen intrusion to produce a failure zone. The range of the failure zone is larger than the border width of the display module, which will cause the edge failure area of ​​the QD film to invade the display area of ​​the display panel, thereby causing the edge of the display screen to appear blue, affecting the display effect. Utility Model Content

[0003] The purpose of the embodiment of the utility model is to provide a display module and a display device to reduce the occurrence of blue edges of the display screen, thereby improving the display effect. The specific technical solution is as follows:

[0004] An embodiment of the first aspect of the present application proposes a display module, comprising a display panel and a backlight assembly arranged on one side of the display panel; the backlight assembly comprises a light source plate, a first diffusion plate and a first quantum dot film; the light source plate is arranged on one side of the display panel; the first diffusion plate is arranged between the display panel and the light source plate, and is stacked with the display panel; the first quantum dot film is arranged between the first diffusion plate and the light source plate, and is spaced apart from the first diffusion plate; and is used to convert the blue light emitted by the light source panel so that the backlight assembly emits white light from the first diffusion plate to the display panel.

[0005] In some embodiments of the present application, the light source panel includes: a plurality of light emitting elements;

[0006] The first quantum dot film has a plurality of holes arranged in one-to-one correspondence with the plurality of light-emitting elements; the light-emitting elements are arranged in the holes;

[0007] And / or, the first quantum dot film includes a plurality of sub-portions, and the sub-portions are arranged between adjacent light-emitting elements.

[0008] In some embodiments of the present application, the distance between the first quantum dot film and the first diffuser plate in the thickness direction of the display module is a second distance, and the second distance is greater than or equal to 12 mm;

[0009] And / or, a single absorption rate of the first quantum dot film to the blue light is less than or equal to 45.5%.

[0010] In some embodiments of the present application, the distance between the light source plate and the first quantum dot film in the thickness direction of the display module is a first distance, the distance between the first quantum dot film and the first diffuser plate in the thickness direction of the display module is a second distance, and the ratio of the second distance to the first distance is 0.4-0.6.

[0011] In some embodiments of the present application, the first distance is 8 mm-15 mm; and / or the second distance is 4 mm-12 mm.

[0012] In some embodiments of the present application, the display module further includes: a second diffusion plate;

[0013] The second diffusion plate is located on a side of the first quantum dot film away from the first diffusion plate, and is disposed in close contact with the first quantum dot film.

[0014] In some embodiments of the present application, the display module further includes: a supporting structure;

[0015] The supporting structure is located at a side of the second diffusion plate away from the first quantum dot film, and is used to support the first quantum dot film and the second diffusion plate.

[0016] In some embodiments of the present application, the display module further includes: a middle frame;

[0017] The middle frame is disposed between the light source plate and the first diffusion plate, and surrounds the first quantum dot film and the second diffusion plate;

[0018] A protruding structure is provided on the inner wall of the middle frame, and the protruding structure is used for overlapping and supporting the second diffusion plate and the first quantum dot film.

[0019] In some embodiments of the present application, the light source panel includes: a plurality of light-emitting elements; the orthographic projection of the first quantum dot film on the light source panel is spaced apart from the plurality of light-emitting elements; or the orthographic projection of the first quantum dot film on the light source panel covers the plurality of light-emitting elements.

[0020] In some embodiments of the present application, the display module also includes a bottom reflective film; the bottom reflective film is located between the first quantum dot film and the light source panel; the first quantum dot film and the bottom reflective film are laminated together; or the first quantum dot film and the bottom reflective film are spaced apart.

[0021] In some embodiments of the present application, the display module further includes: a middle frame; the middle frame is arranged between the light source plate and the first diffusion plate;

[0022] A side reflection film is attached to the inner wall of the middle frame; the orthographic projection of the side reflection film on the light source panel is annular.

[0023] In some embodiments of the present application, the first quantum dot film is laminated to the bottom reflective film;

[0024] A second quantum dot film is disposed on the inner side of the side reflection film; the orthographic projection of the second quantum dot film on the light source panel is annular;

[0025] One end of the second quantum dot film is in contact with the first quantum dot film, and the other end is spaced apart from the first diffuser plate;

[0026] In the thickness direction of the display module, the size of the second quantum dot film is less than two-thirds of the thickness of the display module.

[0027] An embodiment of the second aspect of the present application provides a display device, comprising the display module described in any embodiment of the first aspect.

[0028] Beneficial effects of the embodiments of the utility model:

[0029] The display module of the embodiment of the present application includes a display panel and a backlight assembly, the backlight assembly includes a light source plate, a first diffusion plate and a first quantum dot film; the light source plate is arranged on one side of the display panel, and the two are arranged at an interval; the first diffusion plate is arranged between the display panel and the light source plate, and is stacked with the display panel; the first quantum dot film is arranged between the first diffusion plate and the light source plate, and is arranged at an interval with the first diffusion plate; it is used to convert the blue light emitted by the light source plate so that the backlight assembly emits white light from the first diffusion plate to the display panel, and the backlight assembly provides backlight for the display panel, thereby realizing normal light emission of the display panel; since the first quantum dot film and the first diffusion plate are arranged at an interval, there is a certain light mixing distance between the two, even if the edge of the first quantum dot film is immersed in water and oxygen to produce an edge failure area and a blue edge, the light converted by the effective area of ​​the first quantum dot film and the blue light directly emitted from the failure area of ​​the first quantum dot film will also be mixed to form white light under the light mixing effect of the first diffusion plate, thereby reducing the occurrence of the blue edge of the display screen and improving the display effect.

[0030] The display device of the embodiment of the present application includes the display module of any embodiment of the first aspect, the display module includes a display panel and a backlight assembly, the backlight assembly includes a light source panel, a first diffusion plate and a first quantum dot film; since the first quantum dot film and the first diffusion plate are spaced apart, there is a certain light mixing distance between the two, even if the edge of the first quantum dot film is immersed in water and oxygen to produce an edge failure area and a blue edge, the light converted by the effective area of ​​the first quantum dot film and the blue light directly emitted from the failure area of ​​the first quantum dot film will also be mixed to form white light under the mixing effect of the first diffusion plate, thereby reducing the occurrence of blue edges on the display screen and improving the display effect.

[0031] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0033] Figure 1 This is a schematic structural diagram of a display module according to a first embodiment of the present application;

[0034] Figure 2 This is a first position relationship diagram of the light source plate and the first quantum dot film in the first embodiment of the present application;

[0035] Figure 3 A second position relationship diagram of the light source plate and the first quantum dot film in the first embodiment of the present application;

[0036] Figure 4 This is a light path diagram of the display module of the first embodiment of the present application;

[0037] Figure 5 This is a simulation model diagram without a simulated quantum dot film in the first embodiment of the present application;

[0038] Figure 6 for Figure 5 The blue light spectrum simulated by the model diagram;

[0039] Figure 7 This is a simulation model diagram of a simulated quantum dot film in the first embodiment of the present application;

[0040] Figure 8 for Figure 7 The white light spectrum simulated by the model diagram;

[0041] Fig. 9 This is a blue light mixing model diagram in the first embodiment of the present application (without simulated quantum dot film);

[0042] Fig.10 This is a blue light mixing model diagram in the first embodiment of the present application (with simulated quantum dot film);

[0043] Fig.11 for Fig.10 Ray tracing simulation diagram;

[0044] Fig.12 Based on Fig. 9 The mixed light result diagram obtained by the model;

[0045] Fig.13 Based on Fig.10 The mixed light result diagram obtained by the model (the single absorption rate of the simulated quantum dot film is 25%);

[0046] Fig.14 Based on Fig.10 The mixed light result diagram obtained by the model (the single absorption rate of the simulated quantum dot film is 50%);

[0047] Fig.15 Based on Fig.10 The mixed light result diagram obtained by the model (the single absorption rate of the simulated quantum dot film is 75%);

[0048] Fig.16 This is an optical simulation diagram of the display module of the first embodiment of the present application (OD1=12mm);

[0049] Fig.17 This is an optical simulation diagram of the display module of the first embodiment of the present application (OD2=10mm);

[0050] Fig.18 Based on Fig.17 The model in the figure omits the mixed light result diagram obtained by simulating the quantum dot film;

[0051] Fig.19 Based on Fig.17 The mixed light result diagram obtained by the model in;

[0052] Fig. 20 This is the red / green light mixing model of the first embodiment of the present application;

[0053] Fig.21 for Fig. 20 Mixed light simulation diagram;

[0054] Fig. 22 for Fig.21 Mixed light simulation results;

[0055] Fig.23This is a schematic structural diagram of the display module of the first embodiment of the present application after light source compensation is performed;

[0056] Fig.24 This is a spectrum diagram of the display module of the first embodiment of the present application;

[0057] Fig.25 This is a schematic diagram of the structure of a display module of a second embodiment of the present application;

[0058] Fig.26 Schematic diagram of the structure of a display device according to an embodiment of the present application.

[0059] Description of reference numerals:

[0060] Display panel 100; backlight assembly 200; light source board 210; light emitting element 211; first diffuser 220; bottom reflective film 231; first quantum dot film 232; hole 2321; sub-portion 2322; second diffuser 235; support structure 250; middle frame 260; first connecting portion 261; second connecting portion 262; main body 263; raised structure 2621; groove 264; back plate 270; extension portion 271; step structure 2711; side reflective film 281; second quantum dot film 282; brightness enhancement film 291; adhesive layer 292; frame 300; simulated light board 10; LED 11; simulated diffuser 20; simulated quantum dot film 30. DETAILED DESCRIPTION

[0061] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field based on this application belong to the scope of protection of the utility model.

[0062] With the rapid development of electronic technology, narrow borders have become the development trend of display devices. The display module in the related technology includes a display panel, and a QD film (Quantum Dot Film) is adhered to the non-display side of the display panel. The quantum dot film is an optical film material made by coating the quantum dot material in the middle of two layers of water and oxygen barrier PET (Polyethylene terephthalate) substrates and bonding them together, which is used in backlight sources; quantum dots are a kind of luminescent semiconductor crystal material, which has a narrow and adjustable photoluminescence spectrum, can effectively convert blue light into blue, green and red with high saturation, and can be applied to the LCD (Liquid Crystal Display) field to achieve high color gamut display. However, the edge of the QD film is susceptible to water and oxygen intrusion, resulting in edge failure. Edge failure refers to the failure of the edge of the QD film due to long-term water and oxygen intrusion, which cannot play a role in color change, and is manifested as the edge of the screen turning blue. The width of the conventional QD film failure area in the industry is about 1mm (reliability industry standard 60℃ / 90%RH, 1000h, blue light intensity 20mW / cm 2 ). The width of the failure zone of the QD film is greater than the frame width, especially for the extremely narrow seam series products of the spliced ​​screen AA 0.Xmm (Active-Active within 1mm, the distance between the display area and the display area is less than 1mm). For example: the frame widths on both sides of the display module are 0.6mm and 0.4mm respectively, and the seam is 0.6mm+0.4mm. The frame width is less than the failure zone width, which will cause the edge failure area of ​​the QD film to invade the display area of ​​the display panel, thereby causing the display screen to appear blue at the edge, affecting the display effect. In order to solve the above technical problems, the embodiments of the present application propose a display module and a display device.

[0063] The embodiment of the first aspect of the present application provides a display module, such as Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of the display module of the first embodiment of the present application, the display module includes a display panel 100 and a backlight assembly 200 arranged on one side of the display panel 100; the backlight assembly 200 includes a light source plate 210, a first diffusion plate 220 and a first quantum dot film 232. The light source plate 210 is arranged on one side of the display panel 100, and the two are arranged at intervals; the first diffusion plate 220 is arranged between the display panel 100 and the light source plate 210, and is stacked with the display panel 100; the first quantum dot film 232 is arranged between the first diffusion plate 220 and the light source plate 210, and is arranged at intervals with the first diffusion plate 220; it is used to convert the blue light emitted by the light source plate 210 so that the backlight assembly 200 emits white light from the first diffusion plate 220 to the display panel 100.

[0064] The display module of the embodiment of the present application includes a display panel 100 and a backlight assembly 200, wherein the backlight assembly 200 includes a light source plate 210, a first diffusion plate 220 and a first quantum dot film 232; the light source plate 210 is arranged on one side of the display panel 100, and the two are arranged at an interval; the first diffusion plate 220 is arranged between the display panel 100 and the light source plate 210, and is stacked with the display panel 100; the first quantum dot film 232 is arranged between the first diffusion plate 220 and the light source plate 210, and is arranged at an interval with the first diffusion plate 220; and is used to convert the blue light emitted by the light source plate 210 so that the backlight assembly 200 can transmit the blue light from the first diffusion plate 220 to the display panel 100 emits white light, and the backlight assembly 200 provides backlight for the display panel 100, thereby realizing normal light emission of the display panel 100; since the first quantum dot film 232 and the first diffuser plate 220 are spaced apart, there is a certain light mixing distance between the two. Even if the edge of the first quantum dot film 232 is immersed in water and oxygen to produce an edge failure area and a blue edge, the light converted by the effective area of ​​the first quantum dot film 232 and the blue light directly emitted from the failure area of ​​the first quantum dot film 232 will also be mixed to form white light under the light mixing effect of the first diffuser plate 220, thereby reducing the occurrence of blue edges on the display screen and improving the display effect.

[0065] In the first embodiment of the present application, Figures 1 to 3 As shown, Figure 2 2 is a first position relationship diagram of the light source plate 210 and the first quantum dot film 232 in the first embodiment of the present application. Figure 3 This is a second positional relationship diagram of the light source board 210 and the first quantum dot film 232 in the first embodiment of the present application. The light source board 210 includes a plurality of light-emitting elements 211; the first quantum dot film 232 is fixedly connected to the light source board 210; the orthographic projection of the first quantum dot film 232 on the light source board 210 is arranged at intervals with the plurality of light-emitting elements 211. In this arrangement, the light emitted from the light-emitting element 211 is first emitted to the first diffuser plate 220, and then reflected to the first quantum dot film 232, and reflected back and forth between the two, achieving light mixing and completing color conversion.

[0066] Alternatively, if Figure 2 As shown, the first quantum dot film 232 has a plurality of holes 2321 arranged one-to-one corresponding to the plurality of light-emitting elements 211; the light-emitting elements 211 are arranged in the holes 2321; with such an arrangement, the first quantum dot film 232 and the light source panel 210 can be fixed once, which is convenient for installation. Figure 2 In the illustrated embodiment, the number of the light emitting elements 211 is 25, and the number of the corresponding holes 2321 is also 25.

[0067] Alternatively, if Figure 3As shown, the first quantum dot film 232 includes a plurality of sub-portions 2322, and the sub-portions 2322 are arranged between adjacent light-emitting elements 211. By controlling the number and shape of the sub-portions 2322, it is convenient to control the coverage area of ​​the first quantum dot film 232, and the arrangement method is more flexible. Figure 3 As shown, the shape of each sub-portion 2322 can be a long strip. In some other embodiments of the present application, the shape of the sub-portion 2322 can also be a triangle, an ellipse, a rounded rectangle, etc., which is not limited in the present application. Figure 2 In the illustrated embodiment, the number of light emitting elements 211 is 25, and the number of sub-sections 2322 is 4.

[0068] In the first embodiment of the present application, Figure 1 As shown, the backlight assembly 200 also includes a middle frame 260 and a back plate 270; the back plate 270 is spaced apart from the display panel 100, is located on the side of the light source plate 210 away from the display panel 100, and is fixedly connected to the light source plate 210; the middle frame 260 is arranged around the back plate 270, is located between the light source plate 210 and the first diffuser plate 220, and is respectively connected to the first diffuser plate 220 and the back plate 270 to form a accommodating space; the light source plate 210 and the first quantum dot film 232 are located in the accommodating space, and such an arrangement can isolate water and oxygen and protect the devices located in the accommodating space; optionally, the first diffuser plate 220 and the display panel 100 can be bonded and fixed by an adhesive layer 292; the first diffuser plate 220 and the middle frame 260 can be bonded and fixed by an adhesive layer 292; the adhesive layer 292 plays a role of fixed connection on the one hand, and a sealing role on the other hand, and can be arranged in a ring shape at the edge of the first diffuser plate 220.

[0069] In the first embodiment of the present application, Figure 1 As shown, the middle frame 260 is arranged to overlap with the outer edge of the first quantum dot film 232. In this way, the middle frame 260 has a certain shielding effect on the outer edge of the first quantum dot film 232, and can shield part of the blue light emitted by the failure area of ​​the first quantum dot film 232 at the outer edge, thereby further preventing the display screen from showing a blue edge.

[0070] Alternatively, if Figure 1As shown, the middle frame 260 includes a main body 263 and a first connecting portion 261. The main body 263 is connected to the first diffuser plate 220. The first connecting portion 261 extends from the main body 263 to the light source plate 210 and abuts against the outer edge of the first quantum dot film 232, thereby achieving an overlapping setting of the outer edge of the middle frame 260 and the first quantum dot film 232. The middle frame 260 may also include a second connecting portion 262, which extends from the main body 263 to the back panel 270 and is spaced apart from the first connecting portion 261; a groove 264 for cooperating with the back panel 270 is formed between the second connecting portion 262 and the first connecting portion 261, and the edge of the back panel 270 extends toward the display panel 100 to form an extension portion 271, and the end of the extension portion 271 extends into the groove 264 for fixing with the middle frame 260; the extension portion 271 can also be bent toward the inside of the display module to form a step structure 2711, and the end of the second connecting portion 262 is against the step structure 2711 to improve the connection reliability, and the step structure 2711 has a limiting effect on the middle frame 260 to prevent the first connecting portion 261 from being too long due to processing accuracy problems and damaging the light source panel 210.

[0071] In the first embodiment of the present application, Figure 1 As shown, the display module further includes a bottom reflective film 231 ; the bottom reflective film 231 is located between the first quantum dot film 232 and the light source board 210 , and is bonded to the light source board 210 ; the first quantum dot film 232 is bonded to the bottom reflective film 231 .

[0072] like Figure 4 As shown, Figure 4 2 is a light path diagram of the display module of the first embodiment of the present application; the bottom reflective film 231, the side wall of the middle frame 260 and the first diffuser 220 form a light mixing cavity. Light mixing refers to the direct backlight source, which is composed of a bottom reflective sheet, a top diffuser and a reflective sheet on a side slope structure to form a light mixing cavity. The bottom LED point light source is mixed in the cavity to obtain a surface light source emitted from the top; the blue light emitted by the light emitting element 211 is reflected in the light mixing cavity. Figure 1 The bottom reflection film 231 in the middle can improve the reflectivity of the bottom, making the light mixing more uniform and sufficient. The first quantum dot film 232 absorbs blue light, stimulates red light and green light, and mixes with the unabsorbed blue light, and works together with the first diffuser 220 to form white light. Since the light is reflected back and forth on the first diffuser 220, the bottom reflection film 231 and the side wall of the middle frame 260, the blue light mixing and the blue light color conversion occur synchronously.

[0073] In the first embodiment of the present application, Figure 1As shown, a side reflective film 281 is attached to the inner wall of the middle frame 260, and the orthographic projection of the side reflective film 281 on the light source board 210 is annular. The side reflective film 281 can increase the reflectivity of the side wall of the middle frame 260 to light, so that the light mixing is more uniform and sufficient. Optionally, the ring can be a rectangular ring; the specific shape of the ring is related to the shape of the orthographic projection of the inner wall of the middle frame 260 on the light source board 210. In some other embodiments of the present application, the ring can also be a ring of other shapes of a circular lamp, and the present application does not limit this.

[0074] In the first embodiment of the present application, Figure 1 As shown, the backlight assembly 200 further includes a brightness enhancement film 291, which is disposed between the first diffusion plate 220 and the display panel 100, and is attached to the first diffusion plate 220 and bonded to the display panel 100. The brightness enhancement film 291 can enhance the brightness of the backlight assembly 200, thereby enhancing the brightness of the display module.

[0075] Optionally, the light source board 210 can be a blue light Mini LED (mini light emitting diode) light board, and the light emitting element 211 is a blue light Mini LED. The light board is placed at the bottom as a blue light point light source array and can be adhered to the back panel 270 with thermal conductive adhesive or stretchable tape; the type of the light board can be any one of POB (Package on Board), COB (Chip on Board) and COG (Chip on Glass).

[0076] The backlight assembly 200 of the first embodiment of the present application is a direct-type backlight source, and the first quantum dot film 232 is arranged at the bottom of the direct-type backlight source, in the same plane as the blue light Mini LED light-emitting surface. The two processes of blue light mixing and color conversion occur simultaneously, and the color conversion is completed at the bottom of the backlight source. As long as the light mixing is sufficient, the MDL (module) screen is still a uniform white screen, thereby avoiding the appearance of blue edges in the display area.

[0077] Optionally, the first diffuser plate 220 may be a glass diffuser plate, which may be made of a glass substrate (typical thickness 1.1 mm) with double-sided silk-screen diffusion ink, and the light-emitting surface of the glass substrate is bonded to the brightness enhancement film 291 to form a composite film material. The brightness enhancement film 291 may be a Prism film material, a POP (double Prism) composite film, or a DPP (double prism + Diffuser, diffuser plate) composite film, and the glass substrate is fully bonded to the film material. The glass diffuser plate has the function of mixing light. It converts the LED array light source into a uniform surface light source through the scattering effect of the ink diffused on the upper / lower surfaces of the glass substrate and the bottom reflective film 231. It also has the function of enhancing the brightness. It enhances the brightness of the backlight source through the focusing effect of the prism. It also has the function of structural support. Compared with the traditional PS (polystyrene) plastic diffuser plate, the glass diffuser plate has high strength and small thermal expansion coefficient. It can be directly glued and fixed to the aluminum extruded frame and simultaneously glued to the LCD screen to fix the LCD screen. It can also be used to achieve an extremely narrow frame. Since the backlight, glass diffuser plate, and display panel 100 are assembled by bonding, the edge of the glass diffuser plate is the edge of the product, and there is no structure to block the light under the edge of the display panel 100 with an extremely narrow frame.

[0078] Optionally, the display panel 100 may be a liquid crystal panel, which includes a TFT (Thin Film Transistor), a substrate (not shown in the figure), a CF (color film) substrate (not shown in the figure), a lower polarizer (not shown in the figure) and an upper polarizer (not shown in the figure), wherein the TFT substrate acts as a pixel switch, the CF substrate realizes R (red) / G (green) / B (blue) three-color sub-pixels, and the lower polarizer and the upper polarizer respectively realize the polarization and analysis functions. The liquid crystal panel used in the ultra-narrow frame splicing screen is characterized by a narrow edge BM width, with a typical electrode side BM width of 0.6 mm and a non-electrode side BM width of 0.5 mm.

[0079] Optionally, the back panel 270 and the middle frame 260 can be made of metal: the metal middle frame can be made of aluminum extrusion material, and is fixed to the bent edge of the metal back panel by screws. The top of the metal middle frame is glued to the glass diffuser plate, and the liquid crystal panel is then glued to the glass diffuser plate by frame bonding. The use of a metal middle frame to support the glass diffuser plate and the liquid crystal panel can ensure the dimensional accuracy and straightness of the backlight source, and ensure that pixel occlusion caused by the backlight edge structure entering the AA area (display area) will not occur.

[0080] In order to achieve a better display effect, the display module of the first embodiment of the present application is simulated. The simulation process is divided into uniformity verification of the blue light surface light source and uniformity verification of the red / green light source. If both the blue light surface light source and the red / green light source can obtain uniform surface light sources, the display module can achieve a better display effect.

[0081] Since the first quantum dot film 232 of the embodiment of the present application absorbs a portion of the blue light, the blue light mixing process needs to consider whether the blue light can be mixed into a uniform blue light surface light source after being absorbed by the first quantum dot film 232. Figures 5 to 8 As shown, Figure 5 This is a simulation model diagram without the simulated quantum dot film 30 in the first embodiment of the present application. Figure 6 for Figure 5 The blue light spectrum simulated by the model diagram, Figure 7 This is a simulation model diagram of a simulated quantum dot film 30 in the first embodiment of the present application. Figure 8 for Figure 7 The white light spectrum simulated by the model diagram is as follows: Figure 5 As shown, the light emitted by the LED 11 on the simulated light board 10 is directly emitted from the simulated diffusion plate 20. At this time, the blue light spectrum is as follows: Figure 6 as shown; Figure 7 As shown, the light emitted by the LED 11 on the simulated light board 10 is sequentially emitted through the simulated diffusion plate 20 and the simulated quantum dot film 30 and converted into white light. At this time, the spectrum of the white light is as follows: Figure 8 shown.

[0082] based on Figure 6 and Figure 8 , we define and calculate the single absorption rate of blue light passing through the simulated quantum dot film 30 in the following way:

[0083]

[0084] The influence of the absorption rate of the simulated quantum dot film 30 on the blue light mixing can be simulated by using optical simulation software, such as Fig. 9 As shown, Fig. 9 This is a blue light mixing model diagram in the first embodiment of the present application (without the simulated quantum dot film 30), which is a conventional blue light LED 11 backlight source model, such as Fig.10 As shown, Fig.10 This is a blue light mixing model diagram in the first embodiment of the present application (with a simulated quantum dot film 30), which is a model of adding a simulated quantum dot film 30 at the bottom of the backlight source. The mixing distance OD of the two simulation models is 12mm, LED11 Pitch (the center distance between adjacent LEDs 11) is 10mm, the width of the strip simulated quantum dot film 30 is 4mm, and the coverage rate of the simulated quantum dot film 30 is 40%. The coverage rate refers to the ratio of the total area of ​​the simulated quantum dot film 30 to the surface of the simulated light panel 10 on which the LED 11 is provided. The simulated quantum dot film 30 is set to absorb only blue light, without considering the excitation of red / green light.

[0085] Fig.10 The optical simulation process is as follows Fig.11 As shown, Fig.11 for Fig.10Ray tracing simulation diagram.

[0086] During the simulation process, the single absorption rate of the simulated quantum dot film 30 can be set to 25%, 50% and 75% respectively for simulation, and compared with the conventional case without the simulated quantum dot film 30. The simulation results are as follows: Figures 12 to 15 shown.

[0087] like Fig.12 As shown, Fig.12 Based on Fig. 9 The mixed light result diagram obtained by the model is a conventional case without the simulated quantum dot film 30. Fig.12 The upper left corner shows the screen display, the upper right corner shows the brightness change along the X direction, the lower left corner shows the brightness change along the Y direction, and the lower right corner shows the color comparison in the upper left corner. Different shades represent different brightness.

[0088] like Fig.13 As shown, Fig.13 Based on Fig.10 From the light mixing result diagram obtained by the model (the single absorption rate of the simulated quantum dot film 30 is 25%), it can be seen that the surrounding picture display is basically the same and does not affect the blue light mixing.

[0089] like Fig.14 As shown, Fig.14 Based on Fig.10 From the mixed light result diagram obtained by the model (the single absorption rate of the simulated quantum dot film 30 is 50%), it can be seen that the corresponding periphery of the picture is slightly bright, with a width within 10 mm.

[0090] like Fig.15 As shown, Fig.15 Based on Fig.10 From the mixed light result diagram obtained by the model (the single absorption rate of the simulated quantum dot film 30 is 75%), it can be seen that the brightness around the picture is obvious, the width is close to 20mm, and the brightness of the blue light in the middle area decreases too much due to the absorption of the simulated quantum dot film 30.

[0091] Combined with the above simulation results, it can be seen that only when the absorption rate of blue light by the simulated quantum dot film 30 is less than 50%, a uniform blue light surface light source can be obtained after blue light mixing and absorption. Preferably, the single absorption rate of blue light by the first quantum dot film 232 is less than or equal to 45.5%.

[0092] In addition to the single absorption rate of the first quantum dot film 232 to the blue light, the mixing height (OD) also affects the display screen. The smaller the mixing height, the more times the light is reflected back and forth in the mixing cavity. In theory, the overall absorption of the simulated quantum dot film 30 will increase. The screen after mixing can also be simulated by optical software, such as Fig.16 and Fig.17 As shown, Fig.16 This is an optical simulation diagram of the display module of the first embodiment of the present application (OD1=12mm). Fig.17 This is an optical simulation diagram of the display module of the first embodiment of the present application (OD2=10 mm), and the absorption rate of the simulated quantum dot film 30 is 50%.

[0093] like Fig.18 As shown, Fig.18 Based on Fig.17 The model in the mixed light result diagram omits the simulated quantum dot film 30. When OD=10mm and there is no simulated quantum dot film 30, slight lamp shadow Mura (uneven display of the screen) appears; Fig.19 As shown, Fig.19 Based on Fig.17 The mixed light result diagram obtained by the model in the figure shows that when OD = 10mm, there is a simulated quantum dot film 30, the absorption rate of the simulated quantum dot film 30 is 50%, the lamp shadow Mura is obvious, and a bright edge appears on the screen. From the simulation results, the blue light mixing of the solution with the simulated quantum dot film 30 at the bottom is sensitive to OD. And by comparing Fig.14 It can be seen that Fig.14 Corresponding to OD=12mm, the absorption rate of the simulated quantum dot film 30 is 50%. When OD=10mm, the lamp shadow Mura is obvious. Therefore, in the first embodiment of the present application, the distance between the first quantum dot film 232 and the first diffuser 220 in the thickness direction of the display module is the second distance, and the second distance is greater than or equal to 12mm; the single absorption rate of the first quantum dot film 232 to blue light is less than or equal to 45.5%, which can ensure that the blue light is fully mixed and achieve a better display effect.

[0094] The following simulation is performed on the red / green light mixing. Fig. 20 As shown, Fig. 20 This is the red / green light mixing model of the first embodiment of the present application. Blue light excites the simulated quantum dot film 30 to produce red / green light (yellow light). The red / green light mixing process can make the simulated quantum dot film 30 equivalent to a red / green light surface light source. Each simulated quantum dot film 30 is equivalent to a red / green light source. The mixed light is also reflected back and forth in the optical cavity. Fig.21 and Fig. 22 As shown, Fig.21 for Fig. 20 Mixed light simulation diagram, Fig. 22 for Fig.21 The mixed light simulation result shows that the brightness in the middle area of ​​red / green light is uniform, and there are dark areas on the edges.

[0095] The dark area at the edge is related to the lack of red / green light source at the edge in this model. The edge red and green light can be compensated by adding a simulated quantum dot film 30 at the bottom edge or side wall; Fig.23As shown, Fig.23 This is a schematic structural diagram of the display module of the first embodiment of the present application after light source compensation, a second quantum dot film 282 is provided on the inner side of the side reflection film 281; the orthographic projection of the second quantum dot film 282 on the light source panel 210 is ring-shaped; optionally, the ring can be a rectangular ring; one end of the second quantum dot film 282 is in contact with the first quantum dot film 232, and the other end is spaced apart from the first diffusion plate 220; in the thickness direction of the display module, the size of the second quantum dot film 282 is less than two-thirds of the thickness of the display module, so as to achieve a better display effect.

[0096] When the absorption rate of the simulated quantum dot film 30 is less than 45.5% and OD is ≥12mm, the blue light is fully mixed and a uniform blue light distribution can be obtained on the light-emitting surface; after adding the simulated quantum dot film 30 compensation at the bottom and side walls, the excited red / green light can also be evenly distributed on the light-emitting surface; after the uniform blue light distribution and the uniform red / green light distribution on the light-emitting surface are superimposed, a uniform white light distribution is obtained, achieving a good display effect.

[0097] like Fig.24 As shown, Fig.24 This is a spectrum diagram of the display module of the first embodiment of the present application. Compared with the display module with a conventional simulated quantum dot film 30, the display module with a simulated quantum dot film 30 at the bottom of the first embodiment of the present application (corresponding to ②BLU bottom QD film solution) has a higher proportion of blue light, lower white light brightness, and lower color point, indicating that the proportion of blue light absorbed by the simulated quantum dot film 30 is low; the same white point can be achieved by increasing the concentration of the simulated quantum dot film 30 or increasing the coverage area of ​​the simulated quantum dot film 30.

[0098] The display module of the second embodiment of the present application is different from the display module of the first embodiment of the present application in terms of the location of the first quantum dot film 232 , whether the second diffusion plate 235 is included, and the structure of the middle frame 260 .

[0099] In the second embodiment of the present application, Fig.25 As shown, Fig.25 This is a schematic diagram of the structure of the display module of the second embodiment of the present application, the light source board 210 includes a plurality of light-emitting elements 211; the first quantum dot film 232 is arranged at intervals with the light source board 210 and the first diffusion plate 220; the orthographic projection of the first quantum dot film 232 on the light source board 210 covers the plurality of light-emitting elements 211. With such an arrangement, the first quantum dot film 232 is a complete film layer, and does not require openings, which is convenient for processing and installation.

[0100] In the second embodiment of the present application, Fig.25As shown, the backlight module further includes a bottom reflection film 231; the bottom reflection film 231 is disposed between the light source board 210 and the first quantum dot film 232, and is disposed in close contact with the light source board 210, the first quantum dot film 232 and the bottom reflection film 231 are spaced apart, and the orthographic projection of the bottom reflection film 231 on the light source board 210 is spaced apart from the plurality of light-emitting elements 211. The bottom reflection film 231 can improve the reflectivity of the bottom, so that light mixing is more uniform and sufficient.

[0101] In the second embodiment of the present application, Fig.25 As shown, the display module further includes a second diffuser 235; the second diffuser 235 is located on a side of the first quantum dot film 232 away from the first diffuser 220, and is arranged in close contact with the first quantum dot film 232. In this way, the bottom reflective film 231, the middle frame 260 and the first quantum dot film 232 form a first light mixing cavity (1 st The first quantum dot film 232, the first diffuser plate 220 and the middle frame 260 form a second light mixing cavity (2 nd The first light mixing cavity is a dual light mixing design. The first light mixing cavity initially homogenizes the blue light and converts it into white light through the first quantum dot film 232. The second light mixing cavity continues to homogenize and increase the brightness, thereby obtaining a uniform surface light source. The light mixing process and the color conversion process occur simultaneously.

[0102] In the second embodiment of the present application, Fig.25 As shown, a support structure 250 is provided between the bottom reflection film 231 and the first quantum dot film 232; the support structure 250 is located on the side of the second diffusion plate 235 away from the first quantum dot film 232, and the support structure 250 extends from the bottom reflection film 231 to the first quantum dot film 232, and is used to support the first quantum dot film 232 and the second diffusion plate 235, thereby improving the stability of the display module and preventing the first quantum dot film 232 from deformation.

[0103] Optionally, the first diffuser 220 and the brightness enhancement film 291 can be a glass substrate coated with low haze ink and a brightness enhancement film 291 (prism sheet, DBEF dual brightness enhancement film or DBEF+Prism prism composite film) fully bonded together. The second diffuser 235 can be a PS diffuser, which is lighter than a glass diffuser.

[0104] In the second embodiment of the present application, Fig.25As shown, a protruding structure 2621 is provided on the inner side of the side wall of the middle frame 260, and the protruding structure 2621 is used to overlap and support the second diffuser plate 235 and the first quantum dot film 232, and the protruding structure 2621 is provided in contact with the edge of the second diffuser plate 235. Optionally, the protruding structure 2621 can be formed on the first connecting portion 261. It is beneficial for the structure of the middle frame 260 itself to carry the first quantum dot film 232 and the second diffuser plate 235, and no additional structures are required, the structure is simple, and it is convenient for installation.

[0105] In order to obtain a better display effect, the brightness gain of the corresponding module state with different film material architectures is tested. Table 1 is a comparison table of dual-mixed light film material matching and brightness gain. It can be seen from Table 1 that the brightness gain of the fourth matching scheme is the highest, that is, Fig.25 The embodiment shown has the highest brightness gain; as in the second combination, the prism is placed in the 1st light mixing position and has no contribution to the brightness gain of the display module.

[0106] Table 1

[0107] Item 1 2 3 4 <![CDATA[1 st Mixed light film]]> QD+DP QD+Dual Prism+DP QD+DP QD+DP only <![CDATA[2 nd Mixed light film]]> Glass DP Glass DP DBEF+Glass DP (Dual Prism+DBEF)+Glass DP Brightness Gain 0.42 0.36 0.73 1

[0108] In addition to the film material structure, the OD (light mixing distance) distribution of the two light mixing also has an impact on the overall picture. The experimental platform was built using a light board with LEDPitch = 14mm. The 1st light mixing cavity used a PS diffuser + DQ film, and the 2nd light mixing cavity used a glass diffuser bonded with a double prism + DBEF. The lamp shadow Mura with different H1 and H2 was tested. The test results are shown in Table 2. Table 2 is the result table of the impact of the double light mixing OD distribution on the picture. The H1 values ​​of the first two groups are different, and the H2 values ​​are the same. The H1 values ​​of the last two groups are the same, and the H2 values ​​are different. It can be seen from the obtained mixed light picture that H1 has a greater impact on the lamp shadow Mura than H2. The overall picture optimization direction is to appropriately increase H1 and reduce H2.

[0109] Table 2

[0110] H1(mm) 4 6 8 8 H2(mm) 14 14 10 4 <![CDATA[1 st Mixed light picture]]> Severe Mura Moderate Mura Slight Mura Slight Mura <![CDATA[2 nd Mixed light picture]]> Moderate Mura Slight Mura OK, no mura OK, no mura

[0111] In the second embodiment of the present application, Fig.25 As shown, the distance between the light source plate 210 and the first quantum dot film 232 in the thickness direction of the display module is a first distance H1, and the distance between the first quantum dot film 232 and the first diffuser plate 220 in the thickness direction of the display module is a second distance H2. The ratio of the second distance H2 to the first distance H1 is 0.4-0.6; the numerical range of the first distance H1 is 8-15mm; the numerical range of the second distance H2 is: 4-12mm, which can achieve a better display effect.

[0112] The display module of the first embodiment of the present application is a (direct-down) backlight source with a first quantum dot film 232 at the bottom, the light-emitting surface of the blue light LED and the first quantum dot film 232 are in the same plane, the blue light mixing and color switching processes occur simultaneously, and the color switching is completed at the bottom of the backlight source; the display module of the second embodiment of the present application is a dual light mixing scheme, the first quantum dot film 232 is placed in the middle, the blue light mixing and color switching processes also occur simultaneously, and the color switching is completed at the middle of the backlight source. Since the first quantum dot film 232 and the first diffuser 220 are arranged at intervals, there is a certain light mixing distance between the two, even if the edge of the first quantum dot film 232 is immersed in water and oxygen to produce an edge failure area, resulting in a blue edge, the light converted by the effective area of ​​the first quantum dot film 232 and the blue light directly emitted from the failure area of ​​the first quantum dot film 232 will also be mixed to form white light under the light mixing effect of the first diffuser 220, thereby reducing the occurrence of the edge of the display screen showing blue, and improving the display effect. The display module of the embodiment of the present application is particularly suitable for a spliced ​​screen with a narrow border and is not affected by the edge processing process of the quantum dot film. For example, it is applied to the ELFD (Extremely Large Format Display) series with a border width of 0.88 mm. It can achieve high color gamut, high contrast, high brightness, and extremely narrow seams, thereby improving the performance of the spliced ​​screen product in multiple dimensions.

[0113] Compared with the solution of laminating the quantum dot film with the glass diffuser plate, the glass diffuser plate and the brightness enhancement film are fully laminated and then fixed to the display panel after two laminating steps; in the display module of the embodiment of the present application, the quantum dot film does not need to be laminated to the glass diffuser plate, and the glass diffuser plate and the brightness enhancement film 291 are fixed to the actual panel after one laminating, which is lower in cost.

[0114] An embodiment of the second aspect of the present application provides a display device, comprising the display module of any embodiment of the first aspect.

[0115] The display device of the embodiment of the present application includes the display module of any embodiment of the first aspect, the display module includes a display panel 100 and a backlight assembly 200, the backlight assembly 200 includes a light source panel 210, a first diffuser plate 220 and a first quantum dot film 232; since the first quantum dot film 232 and the first diffuser plate 220 are arranged at an interval, there is a certain light mixing distance between the two. Even if the edge of the first quantum dot film 232 is immersed in water and oxygen to produce an edge failure area and a blue edge, the light converted by the effective area of ​​the first quantum dot film 232 and the blue light directly emitted from the failure area of ​​the first quantum dot film 232 will also be mixed to form white light under the mixing effect of the first diffuser plate 220, thereby reducing the occurrence of blue edges on the display screen and improving the display effect.

[0116] like Fig.26 As shown, Fig.26 This is a structural schematic diagram of a display device according to an embodiment of the present application. The display device may include multiple display modules. The frames 300 of the multiple display modules are spliced ​​together to form a MiniLED backlight spliced ​​screen with high uniformity of the peripheral image.

[0117] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A display module, characterized in that: It includes a display panel and a backlight assembly arranged on one side of the display panel; The backlight assembly comprises: A light source panel is arranged on one side of the display panel; A first diffusion plate, disposed between the display panel and the light source plate, and stacked with the display panel; The first quantum dot film is arranged between the first diffusion plate and the light source plate and spaced apart from the first diffusion plate; and is used for converting the blue light emitted by the light source plate so that the backlight assembly emits white light from the first diffusion plate to the display panel.

2. The display module according to claim 1, characterized in that: The light source panel comprises: a plurality of light emitting elements; The first quantum dot film has a plurality of holes arranged in one-to-one correspondence with the plurality of light-emitting elements; the light-emitting elements are arranged in the holes; And / or, the first quantum dot film includes a plurality of sub-portions, and the sub-portions are arranged between adjacent light-emitting elements.

3. The display module according to claim 1, characterized in that: The distance between the first quantum dot film and the first diffuser plate in the thickness direction of the display module is a second distance, and the second distance is greater than or equal to 12 mm; And / or, a single absorption rate of the first quantum dot film to the blue light is less than or equal to 45.5%.

4. The display module according to claim 1, characterized in that: The distance between the light source plate and the first quantum dot film in the thickness direction of the display module is a first distance, the distance between the first quantum dot film and the first diffuser plate in the thickness direction of the display module is a second distance, and the ratio of the second distance to the first distance is 0.4-0.

6.

5. The display module according to claim 4, characterized in that: The first distance is 8 mm-15 mm; and / or the second distance is 4 mm-12 mm.

6. The display module according to claim 4, characterized in that: The display module further includes: a second diffusion plate; The second diffusion plate is located on a side of the first quantum dot film away from the first diffusion plate, and is disposed in close contact with the first quantum dot film.

7. The display module according to claim 6, characterized in that: The display module further includes: a supporting structure; The supporting structure is located at a side of the second diffusion plate away from the first quantum dot film, and is used to support the first quantum dot film and the second diffusion plate.

8. The display module according to claim 7, characterized in that: The display module further includes: a middle frame; The middle frame is disposed between the light source plate and the first diffusion plate, and surrounds the first quantum dot film and the second diffusion plate; A protruding structure is provided on the inner wall of the middle frame, and the protruding structure is used for overlapping and supporting the second diffusion plate and the first quantum dot film.

9. The display module according to claim 1, characterized in that The light source panel comprises: a plurality of light emitting elements; an orthographic projection of the first quantum dot film on the light source panel is arranged at intervals from the plurality of light emitting elements; or an orthographic projection of the first quantum dot film on the light source panel covers the plurality of light emitting elements.

10. The display module according to claim 1, characterized in that: The display module further includes a bottom reflection film; the bottom reflection film is located between the first quantum dot film and the light source panel; the first quantum dot film and the bottom reflection film are bonded to each other; or the first quantum dot film and the bottom reflection film are spaced apart from each other.

11. The display module according to claim 10, characterized in that: The display module further includes: a middle frame; the middle frame is arranged between the light source plate and the first diffusion plate; A side reflection film is attached to the inner wall of the middle frame; the orthographic projection of the side reflection film on the light source panel is annular.

12. The display module according to claim 11, characterized in that: The first quantum dot film is laminated to the bottom reflective film; A second quantum dot film is disposed on the inner side of the side reflection film; the orthographic projection of the second quantum dot film on the light source panel is annular; One end of the second quantum dot film is in contact with the first quantum dot film, and the other end is spaced apart from the first diffuser plate; In the thickness direction of the display module, the size of the second quantum dot film is less than two-thirds of the thickness of the display module.

13. A display device, characterized in that: A display module comprising any one of claims 1 to 12.

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