Display module and display apparatus

Abstract

Provided in the present application are a display module and a display apparatus. The display module comprises a display panel, an optical adhesive layer and an adhesive layer, wherein the display panel comprises a pixel definition layer, a light-emitting device, a light-shielding layer, a filter film and a planarization layer, and the light-shielding layer is provided with a first opening, and the planarization layer is provided with a second opening which overlaps with the first opening; the optical adhesive layer is arranged on the planarization layer and the filter film, and the adhesive layer is arranged on the optical adhesive layer and partially fills the second opening; and the refractive index of the adhesive layer is greater than the refractive index of the planarization layer, and the refractive index of the optical adhesive layer is less than or equal to the refractive index of the planarization layer. The present application can improve the efficiency of light output in a front angle-of-view direction.

Description

Display module and display device 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] A display panel (OLED display panel) includes an organic light-emitting component, and the light generated by the light-emitting component can be emitted not only in the front direction but also in the side direction. The OLED display panel has different light output efficiencies in different light emission directions.

[0003] In actual use, a consumer usually observes the OLED display panel in the front view angle. Therefore, improving the light output efficiency of the OLED display panel in the front view angle direction is of great significance to improve the display effect and enhance the user experience. However, the light output efficiency of the OLED display panel in the front view angle direction in the prior art is low, which limits the improvement of the display effect and the reduction of energy consumption. SUMMARY

[0004] Embodiments of the present application provide a display module and a display device, aiming to improve the light output efficiency in the front view angle direction.

[0005] An embodiment of the present application provides a display module, comprising: a display panel, the display panel comprising a pixel defining layer, a light-emitting component, a light-blocking layer, a light filter film and a flat layer, the pixel defining layer being provided with a receiving portion, at least a part of the light-emitting component being arranged in the receiving portion, the light-blocking layer being provided with a first opening, the first opening overlapping the receiving portion, at least a part of the light filter film being arranged in the first opening, the flat layer being arranged on the light filter film and the light-blocking layer, the flat layer being provided with a second opening overlapping the first opening of the light-blocking layer, the second opening exposing at least a part of the light filter film; an optical adhesive layer, the optical adhesive layer being arranged on the flat layer and the light filter film; and an adhesive layer, the adhesive layer being arranged on the optical adhesive layer and at least a part of the adhesive layer being filled in the second opening; wherein the refractive index of the adhesive layer is greater than the refractive index of the flat layer, and the refractive index of the optical adhesive layer is less than or equal to the refractive index of the flat layer.

[0006] An embodiment of the present application further provides a display device, comprising the above display module. ADVANTAGEOUS EFFECTS

[0007] In the display module provided in the present application, since the refractive index of the adhesive layer is greater than the refractive index of the planar layer, and the refractive index of the optical adhesive layer is less than or equal to the refractive index of the planar layer, when the light emitted by the light-emitting device passes through these film layers in turn, refraction occurs, and when the light passes from the planar layer with a lower refractive index into the adhesive layer with a higher refractive index, it is deflected towards the normal direction, which helps to guide the light originally propagating sideways to a direction closer to the normal viewing angle, thereby improving the light output efficiency in the normal viewing angle direction. In addition, the second opening of the planar layer forms a micro optical structure, and since the adhesive layer fills in this opening, when the light reaches the inclined side wall of the opening, reflection occurs, further enhancing the ability to turn the lateral light to the normal viewing angle direction. In particular, by optimizing the size and position of the second opening, the reflection effect is further strengthened, while ensuring that enough light enters the opening, and at the same time ensuring that there is enough side wall area to achieve effective reflection, thereby improving the light output efficiency in the normal viewing angle direction. In addition, by optimizing the relationship between the mechanical properties of the adhesive layer and the functional film layer of the cover plate, the display module can maintain good bending performance and adhesion at different temperatures, which is conducive to improving the reliability and durability of the display module. The display module provided in the present application is suitable for application scenarios such as foldable display devices. BRIEF DESCRIPTION OF DRAWINGS

[0008] FIG. 1 is a schematic diagram of a display device provided in the present application.

[0009] FIG. 2 is a schematic diagram of a display module provided in the present application. Embodiments of the present application

[0010] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0011] The terms "first", "second", and similar words do not represent any order, number, or importance, but are only used to distinguish different technical features. The term "multiple" and similar words represent two or more, unless otherwise explicitly limited.

[0012] The two embodiments of the present application can be combined with each other.

[0013] As shown in FIG. 1, the display device provided in the embodiments of the present application can be, for example, an OLED display device, which includes a display module, a source driver circuit, a timing controller, a light-emitting controller, and a power management chip. The display module includes a display panel, which includes a gate driver circuit, a driver device layer 102, a light-emitting device 104, a touch device layer 105, and an encapsulation layer 106. The touch device layer 105 is disposed on the surface of the encapsulation layer 106, or the touch device layer 105 is integrated between the encapsulation layer 106 and the light-emitting device 104.

[0014] As shown in FIG. 2, a substrate 101 of a display panel is provided with a driving device layer 102, the driving device layer 102 is provided with a pixel defining layer 103, the pixel defining layer 103 is provided with a plurality of accommodating portions, a light emitting device 104 is arranged in the accommodating portion, that is, at least part of the light emitting device is arranged in the accommodating portion, the light emitting device 104 includes red, green and blue pixel organic light emitting layers, the driving device layer 102, the light emitting device 104 and the pixel defining layer 103 are provided with a touch device layer 105, an encapsulation layer 106 is arranged on the touch device layer 105, or the encapsulation layer 106 is arranged on the pixel defining layer 103, the driving device layer 102 and the light emitting device 104, and the touch device layer 105 is arranged on the encapsulation layer 106. The substrate can be, for example, a glass substrate, a flexible substrate (for example, a polyimide substrate) and the like. The driving device layer 102 includes a data line DL, a scan line SL, a power line (VDD, VSS), a light emitting control signal line EM and a pixel driving circuit, the pixel driving circuit and the light emitting device 104 constitute a pixel unit PX. The light emitting device 104 includes a light emitting layer, an electron transport layer, a hole transport layer, a cathode and an anode and the like. The encapsulation layer 106 includes a multilayer structure of organic / inorganic alternation. Each stage of the gate driving unit in the gate driving circuit corresponds to control of a row of pixel units PX. Each stage of the gate driving unit is composed of a thin film transistor (TFT) and a capacitor. The source driving circuit is used to provide a data signal to the pixel unit PX. The timing controller is used to receive externally input image data and synchronization signals, and generate signals required by the gate driving circuit and the source driving circuit. The power management chip is used to provide the required working voltage for each part of the display device.

[0015] The display panel comprises a light shielding layer (BM, Black Matrix) 107 and a color filter (CF), that is, the light shielding layer 107 is arranged on the encapsulation layer 106 or the touch device layer 105, the first opening is arranged on the light shielding layer 107, the first opening overlaps the accommodating portion, that is, the first opening is located above the light emitting device 104, the color filter 108 is arranged on the light shielding layer 107 and in the first opening, the color filter 108 corresponds to the light emitting device 104 (red, green and blue pixels), at least part of the color filter 108 is located in the first opening of the light shielding layer 107 and on the encapsulation layer 106 exposed by the first opening of the light shielding layer 107, the color filter 108 is located above the light emitting device 104, the flat layer 109 is arranged on the color filter 108 and the light shielding layer 107, that is, the flat layer 109 is arranged on the surface of the color filter 108 and the light shielding layer 107 away from the encapsulation layer 106, the flat layer 109 is in direct contact with the color filter 108 and the light shielding layer 107, part of the flat layer 109 also covers part of the color filter 108, the flat layer 109 is provided with a second opening, the position of the second opening corresponds to (overlaps) the position of the light emitting device 104, that is, the second opening overlaps the first opening of the light shielding layer 107, the second opening exposes part of the color filter 108, the flat layer 109 is a leveling layer and has no adhesion, the refractive index n1 of the flat layer 109 is 1.5-1.54, for example, n1 is 1.5, 1.51, 1.52, 1.53 or 1.54, the thickness of the part of the flat layer 109 located on the light shielding layer 107 and on one side of the center of the color filter 108 is H1, the thickness of the part of the flat layer 109 located on the light shielding layer 107 and on the other side of the center of the color filter 108 is H2, the distance between the top surface of the flat layer 109 and the top surface of the color filter 108 is H3, H1 is greater than or equal to 3 times H3 and less than or equal to 7 times H3, H2 is greater than or equal to 3 times H3 and less than or equal to 7 times H3.Preferably, H1=H2=2~21 microns, for example, H1=H2=2 microns, 2.4 microns, 2.7 microns, 3.2 microns, 3.5 microns, 4 microns, 4.3 microns, 4.7 microns, 5.2 microns, 5.5 microns, 6.1 microns, 6.4 microns, 6.8 microns, 7.1 microns, 7.5 microns, 7.9 microns, 8.4 microns, 8.9 microns, 9.2 microns, 9.7 microns, 10.1 microns, 10.4 microns, 10.8 microns, 11.3 microns, 11.6 microns, 12 microns, 12.4 microns, 12.9 microns, 13.2 microns, 13.5 microns, 13.9 microns, 14.3 microns, 14.8 microns, 15.1 microns, 15.5 microns, 15.9 microns, 16.4 microns, 16.7 microns, 17.2 microns, 17.6 microns, 18 microns, 18.3 microns, 18.8 microns, 19.1 microns, 19.6 microns, 20 microns, 20.5 microns, 20.8 microns, 21 microns, H3=0.3~3 microns, for example, H3=0.3 microns, 0.4 microns, 0.5 microns, 0.6 microns, 0.7 microns, 0.8 microns, 0.9 microns, 1 microns, 1.1 microns, 1.2 microns, 1.3 microns, 1.4 microns, 1.5 microns, 1.6 microns, 1.7 microns, 1.8 microns, 1.9 microns, 2 microns, 2.1 microns, 2.2 microns, 2.3 microns, 2.4 microns, 2.5 microns, 2.6 microns, 2.7 microns, 2.8 microns, 2.9 microns, 3 microns.

[0016] The above technical solution ensures that the sidewall of the second opening has sufficient area to reflect light, enhancing the total reflection effect. In addition, by controlling the ratio of the thickness H1, H2 and H3 of the flat layer 109, the refractive index difference between the flat layer 109 and the adhesive layer 111 can be fully utilized, so that more light is totally reflected at the interface, further improving the propagation direction of the light. In particular, by controlling the ratio of the thickness H1, H2 and H3 of the flat layer 109, the optical effect of the high-low refractive index interface can be maximized, and the total reflection effect of the light entering the high refractive index material (adhesive layer 111) from the low refractive index material (flat layer 109) can be improved.

[0017] The size of the second opening of the flat layer 109 is smaller than the size of the first opening of the light shielding layer 107. The distance between the bottom edge of the second opening of the flat layer 109 on one side of the center line of the plane in which the filter film 108 is located and the bottom edge of the first opening of the light shielding layer 107 on the same side of the center line is D1, and the distance between the bottom edge of the second opening of the flat layer 109 on the other side of the center line and the bottom edge of the first opening of the light shielding layer 107 on the other side of the center line is D2. D1 is greater than or equal to 1 / 50 of the diameter of the minimum circumscribed circle of the bottom of the second opening and less than or equal to 1 / 15 of the diameter of the minimum circumscribed circle of the bottom of the second opening, and D2 is greater than or equal to 1 / 50 of the diameter of the minimum circumscribed circle of the bottom of the second opening and less than or equal to 1 / 15 of the diameter of the minimum circumscribed circle of the bottom of the second opening. The absolute value of the difference between D1 and D2 is within the range of 0-10 microns, and preferably, D1=D2, wherein D1 and D2 are within the range of -2-8 microns, for example, D1=D2=-2 microns, -1.8 microns, -1.6 microns, -1.4 microns, -1.2 microns, -1 micron, -0.8 microns, -0.6 microns, -0.4 microns, -0.2 microns, 0 microns, 0.2 microns, 0.4 microns, 0.6 microns, 0.8 microns, 1.0 microns, 1.2 microns, 1.4 microns, 1.6 microns, 1.8 microns, 2.0 microns, 2.2 microns, 2.4 microns, 2.6 microns, 2.8 microns, 3.0 microns, 3.2 microns, 3.4 microns, 3.6 microns, 3.8 microns, 4.0 microns, 4.2 microns, 4.4 microns, 4.6 microns, 4.8 microns, 5.0 microns, 5.2 microns, 5.4 microns, 5.6 microns, 5.8 microns, 6.0 microns, 6.2 microns, 6.4 microns, 6.6 microns, 6.8 microns, 7.0 microns, 7.2 microns, 7.4 microns, 7.6 microns, 7.8 microns, 8.0 microns, the bottom edge of the second opening of the flat layer 109 on one side of the center line is between the center line and the bottom edge of the first opening of the light shielding layer 107 on the same side of the center line, and the bottom edge of the second opening of the flat layer 109 on the other side of the center line is between the center line and the bottom edge of the first opening of the light shielding layer 107 on the other side of the center line.

[0018] The above scheme ensures that the second opening is large enough to receive the light emitted by the light emitting device 104. In particular, by controlling the size and positional relationship of the opening, it is ensured that sufficient light can enter the second opening, and at the same time, sufficient sidewall area is ensured to achieve total reflection, thereby effectively guiding more light to the front view angle direction, improving the brightness of the front view angle.

[0019] The angle between the side wall of the second opening of the flat layer 109 on one side of the center line and the top surface of the filter film 108 is θ1, and the angle between the side wall of the second opening of the flat layer 109 on the other side of the center line and the top surface of the filter film 108 is θ2, both θ1 and θ2 are less than 90°.

[0020] The material of the adhesive layer 111 is a high refractive index adhesive, that is, the adhesive layer 111 is a high refractive index adhesive layer, has adhesion, and has a peeling force of 0.6-2 kgf / inch on glass at 25°C and a peeling force of 0.1-0.8 kgf / inch on glass at 70°C. The transmittance of the adhesive layer 111 is >90%. The refractive index n2 of the adhesive layer 111 is greater than the refractive index n1 of the flat layer 109, for example, the refractive index n2 of the adhesive layer 111 is 1.55-1.65, for example, n2=1.55, 1.56, 1.57, 1.58, 1.59, 1.6, 1.61, 1.62, 1.63, 1.64, 1.65. Thus, the light output efficiency is greatly improved.

[0021] The surface of the adhesive layer 111 away from the flat layer is provided with a cover plate 112, the cover plate 112 contains polyacrylate, polyurethane, polydimethylsiloxane and other compounds. The cover plate 112 includes a functional film layer, which may, for example, be a resin layer (polyethylene terephthalate PET), and further includes other film layers, for example, ultra-thin glass (UTG) and the like, the functional film layer of the cover plate 112 is in contact with the adhesive layer, the thickness of the functional film layer (the adhesive layer in the cover plate 112) is 10-50 microns, for example, the thickness is 10 microns, 12 microns, 14 microns, 16 microns, 18 microns, 20 microns, 22 microns, 24 microns, 26 microns, 28 microns, 30 microns, 32 microns, 34 microns, 36 microns, 38 microns, 40 microns, 42 microns, 44 microns, 46 microns, 48 microns, 50 microns, the thickness of the adhesive layer 111 is 25-75 microns, for example, the thickness is 25 microns, 27 microns, 29 microns, 31 microns, 33 microns, 35 microns, 37 microns, 39 microns, 41 microns, 43 microns, 45 microns, 47 microns, 49 microns, 51 microns, 53 microns, 55 microns, 57 microns, 59 microns, 61 microns, 63 microns, 65 microns, 67 microns, 69 microns, 71 microns, 73 microns, 75 microns, the thickness of the functional film layer is greater than or equal to 1 / 8 of the thickness of the adhesive layer 111 and less than or equal to 5 times the thickness of the adhesive layer 111, for example, the multiple is 1 / 8, 1 / 6, 1 / 4, 1 / 2, 1, 1.2, 1.4, 1.6, 1.8, 2, 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4, 3.6, 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, the thickness of the functional film layer + the thickness of the adhesive layer 111 ≤100 microns.

[0022] The storage modulus of the adhesive layer 111 at 25℃ is 25-65 kPa, the storage modulus of the adhesive layer 111 at 25℃ is 1-2 times the storage modulus of the functional film layer (the adhesive layer in the cover plate 112) at 25℃, and the storage modulus of the adhesive layer 111 at 70℃ is 1 / 2-1 times the storage modulus of the functional film layer at 70℃.

[0023] The creep recovery rate of the adhesive layer 111 at 25℃ is ≥80%, and the creep recovery rate of the adhesive layer 111 at 25℃ is 0.8-1 times the creep recovery rate of the functional film layer at 25℃.

[0024] The optical adhesive layer 110 is further arranged between the flat layer 109 and the adhesive layer 111, and is also arranged between the inner surface of the second opening and the adhesive layer 111, that is, the optical adhesive layer 110 is arranged on the flat layer 109 and the light filtering film 108, and the thickness of the optical adhesive layer 110 is 10-1000 nm. Preferably, the thickness of the optical adhesive layer 110 is in the range of 50-200 nm.

[0025] The optical adhesive layer 110 includes an organic substance, and the molecular chain of the organic substance has a -NH-COO- chain structure. For example, the organic substance can be a polyurethane derivative with a -NH-COO- chain structure. The optical adhesive layer 110 also includes an inorganic substance, which is an inorganic nanoparticle. The inorganic nanoparticle includes zirconium oxide or titanium oxide. The size (particle size) of the inorganic nanoparticle is in the range of 10-50 nm.

[0026] The adhesive layer 111 is arranged on the optical adhesive layer 110 and at least partially fills the second opening.

[0027] That is, the surface of the flat layer 109 and the filter film 108 exposed by the second opening of the flat layer 109 are provided with an optical adhesive layer 110, which is a low refractive index layer with a refractive index n3, n3 is less than or equal to the refractive index n1 of the flat layer 109, the refractive index n3 of the optical adhesive layer is in the range of 1.45~1.52, for example, n3=1.45, 1.46, 1.47, 1.48, 1.49, 1.5, 1.51, 1.52, preferably n3=1.5. The optical glue layer 110 is generated by the reaction of diisocyanate and dihydric alcohol: O=C=N-R-N=C=O + HO-C3H6-OH O=C=N-R-NH-CO-O-C3H6-OH, that is, the optical glue layer 110 is arranged on the flat layer 109, part of the optical glue layer 110 is also arranged in the second opening of the flat layer 109 and fills the second opening, the material of the optical glue layer 110 is different from the material of the flat layer 109 (siloxane + polyacrylate), the thickness of the optical glue layer 110 is between 10-1000 nanometers, for example, the thickness is 10 nanometers, 20 nanometers, 30 nanometers, 40 nanometers, 50 nanometers, 60 nanometers, 70 nanometers, 80 nanometers, 90 nanometers, 100 nanometers, 110 nanometers, 120 nanometers, 130 nanometers, 140 nanometers, 150 nanometers, 160 nanometers, 170 nanometers, 180 nanometers, 190 nanometers, 200 nanometers, 210 nanometers, 220 nanometers, 230 nanometers, 240 nanometers, 250 nanometers, 260 nanometers, 270 nanometers, 280 nanometers, 290 nanometers, 300 nanometers, 310 nanometers, 320 nanometers, 330 nanometers, 340 nanometers, 350 nanometers, 360 nanometers, 370 nanometers, 380 nanometers, 390 nanometers, 400 nanometers, 410 nanometers, 420 nanometers, 430 nanometers, 440 nanometers, 450 nanometers, 460 nanometers, 470 nanometers, 480 nanometers, 490 nanometers, 500 nanometers, 510 nanometers, 520 nanometers, 530 nanometers, 540 nanometers, 550 nanometers, 560 nanometers, 570 nanometers, 580 nanometers, 590 nanometers, 600 nanometers, 610 nanometers, 620 nanometers, 630 nanometers, 640 nanometers, 650 nanometers, 660 nanometers, 670 nanometers, 680 nanometers, 690 nanometers, 700 nanometers, 710 nanometers, 720 nanometers, 730 nanometers, 740 nanometers, 750 nanometers, 760 nanometers, 770 nanometers, 780 nanometers, 790 nanometers, 800 nanometers, 810 nanometers, 820 nanometers, 830 nanometers, 840 nanometers, 850 nanometers, 860 nanometers, 870 nanometers, 880 nanometers, 890 nanometers, 900 nanometers, 910 nanometers, 920 nanometers, 930 nanometers, 940 nanometers, 950 nanometers, 960 nanometers, 970 nanometers, 980 nanometers, 990 nanometers, 1000 nanometers, preferably 50-200 nanometers, at least part of the optical glue layer 110 is organic matter, part of which is inorganic matter, the inorganic matter is inorganic nanoparticles: zirconium oxide, titanium oxide, the molecular chain of the organic matter has a -NH-COO- chain structure. The organic matter includes thermoplastic polyurethane elastomer rubber (TPU, Thermoplastic polyurethanes). The adhesive layer 111 covers the optical glue layer 110.

[0028] The optical adhesive layer 110 is formed by forming a protective film including an optical adhesive material on the surface of the flat layer 109 away from the light shielding layer 107 and the inner surface of the second opening of the flat layer 109, and the protective film is adhered to the surface of the flat layer 109 away from the light shielding layer 107 and the inner surface of the second opening of the flat layer 109 by the optical adhesive material, and the protective film is removed (torn) after the display panel provided with the protective film is transported, and before the subsequent step of forming an adhesive layer on the optical adhesive layer 110. The optical adhesive layer (optical adhesive material) 110 is formed (adhered) on the surface of the flat layer 109 away from the light shielding layer 107 and the inner surface of the second opening of the flat layer 109. In this way, the formed optical adhesive layer 110 can be uniformly arranged on the surface of the flat layer 109 away from the light shielding layer 107 and the inner surface of the second opening of the flat layer 109, avoiding defects such as uneven thickness or uneven distribution of the optical adhesive layer 110. The uniform optical adhesive layer 110 is beneficial to improve the overall optical performance of the display module.

[0029] As shown in FIG. 2, the display module provided by the present application includes a display panel and a touch device layer 105, the touch device layer 105 is arranged on the surface of the display panel, or the touch device layer 105 is integrated in the display panel.

[0030] The display panel includes a substrate 101, a driver device layer 102 arranged on the substrate 101, a pixel defining layer 103 arranged on the driver device layer 102, a light emitting device 104 arranged in a containing portion in the pixel defining layer 103, the light emitting device 104 being electrically connected with a thin film transistor (TFT) of the driver device layer 102, an encapsulation layer 106 arranged on the pixel defining layer 103, the driver device layer 102 and the light emitting device 104, and the touch device layer 105 arranged on the encapsulation layer 106, or the touch device layer 105 is arranged between the entire body constituted by the pixel defining layer 103, the driver device layer 102 and the light emitting device 104 and the encapsulation layer 106.

[0031] The display module further includes:

[0032] The light shielding layer 107 is arranged on the display panel, and the light shielding layer 107 is provided with a first opening, the position of the first opening overlaps with the position of the light emitting device 104, and the first opening exposes a part of the touch device layer 105 or the encapsulation layer 106 or a part thereof. The material of the light shielding layer 107 is black resin, and the thickness thereof is within the range of 0.5-2 microns.

[0033] The light filtering film 108 is arranged in the first opening, a part of the light filtering film 108 is arranged in the first opening and on the touch device layer 105 or the encapsulation layer 106, and another part of the light filtering film 108 is arranged on the light shielding layer 107. The material of the light filtering film 108 is a color photoresist, and the thickness of the light filtering film 108 is in the range of 1-3 microns.

[0034] The flat layer 109 is arranged on the light filtering film 108 and the light shielding layer 107, and the flat layer 109 is provided with a second opening overlapping the first opening of the light shielding layer 107, that is, the position of the second opening overlaps the position of the light emitting device 104, and the second opening exposes at least a part of the light filtering film 108. The surface of the flat layer 109 is concave-convex, and the concave part of the flat layer 109 (i.e., the second opening of the flat layer 109) corresponds to the light emitting device 104 of the red / green / blue pixel of the display panel, and in the top view of the display panel, the convex part of the flat layer 109 is arranged in a region not overlapping the light emitting device 104.

[0035] The adhesive layer 111 (high refractive index material layer) is arranged on the flat layer 109 and the light filtering film 108 exposed by the second opening of the flat layer 109.

[0036] The cover plate 112 is arranged on the adhesive layer 111.

[0037] The refractive index of the adhesive layer 111 is greater than the refractive index of the flat layer 109.

[0038] The thickness of the flat layer 109 is 2-5 microns. The refractive index of the flat layer 109 is in the range of 1.5-1.54, and the refractive index of the adhesive layer 111 is in the range of 1.55-1.65.

[0039] The size of the second opening of the flat layer 109 is smaller than the size of the first opening of the light shielding layer 107. In this way, the light can be effectively guided and focused to the front view angle direction.

[0040] In the top view of the display module, the distance D1 between the bottom edge of the second opening of the flat layer 109 on one side of the center of the light filtering film 108 and the bottom edge of the first opening of the light shielding layer 107 is equal to the distance D2 between the bottom edge of the second opening of the flat layer 109 on the other side of the center of the light filtering film 108 and the bottom edge of the first opening of the light shielding layer 107, and D1 and D2 are both in the range of -2-8 microns.

[0041] In the top view of the display module, the bottom edge of the second opening of the flat layer 109 is closer to the center of the light filtering film 108 than the bottom edge of the first opening of the light shielding layer 107.

[0042] The angle θ1 between the sidewall of the second opening of the flat layer 109 on one side of the center of the filter film 108 and the top surface of the filter film 108 is less than 90°, and the angle θ2 between the sidewall of the second opening of the flat layer 109 on the other side of the center of the filter film 108 and the top surface of the filter film 108 is less than 90°. Preferably, the inclination angles θ1 and θ2 of the sidewall of the second opening are in the range of 60° to 85°.

[0043] The thickness H1 of the portion of the flat layer 109 on one side of the center of the filter film 108 on the light shielding layer 107 is equal to the thickness H2 of the portion of the flat layer 109 on the other side of the center of the filter film 108 on the light shielding layer 107, wherein the values of H1 and H2 are in the range of 2 to 5 microns.

[0044] The distance H3 between the top surface of the flat layer 109 and the top surface of the filter film 108 is in the range of 1 to 3 microns.

[0045] The thickness of the functional film layer in the cover plate 112 is 1 / 8 to 5 times the thickness of the adhesive layer 111.

[0046] The thickness of the adhesive layer 111 is 25 to 75 microns, and the thickness of the functional film layer in the cover plate 112 is 10 to 50 microns.

[0047] The sum of the thickness of the functional film layer in the cover plate 112 and the thickness of the adhesive layer 111 is less than or equal to 100 microns.

[0048] Silicon dioxide nanoparticles are arranged in the functional film layer to improve the mechanical strength and heat resistance of the functional film layer. In the case of a glass cover plate 112, the thickness of the functional film layer is in the range of 20 to 40 microns, and in the case of a plastic cover plate 112, the thickness of the functional film layer is in the range of 30 to 50 microns.

[0049] The storage modulus of the adhesive layer 111 at 25°C is greater than or equal to 1 times the storage modulus of the functional film layer in the cover plate 112 at 25°C, and less than or equal to 2 times the storage modulus of the functional film layer in the cover plate 112 at 25°C. The storage modulus of the adhesive layer 111 at 25°C is 25 to 65 kPa. Therefore, the adhesive layer 111 can have appropriate hardness and elasticity, and can provide sufficient structural support and stress buffering effect for the display module while maintaining a high refractive index, which is conducive to improving the bending performance of the display module.

[0050] The storage modulus of the adhesive layer 111 at 70℃ is greater than or equal to 1 / 2 of the storage modulus of the functional film layer in the cover plate 112 at 70℃ and less than or equal to 1 times the storage modulus of the functional film layer in the cover plate 112 at 70℃. Thus, it can be ensured that the adhesive layer 111 still maintains proper elasticity and adhesion at a higher temperature, which helps to maintain the stability of the bending performance of the display module in different temperature environments.

[0051] The creep recovery rate of the adhesive layer 111 at 25℃ is greater than or equal to 0.8 of the creep recovery rate of the functional film layer in the cover plate 112 at 25℃ and less than or equal to 1 times the creep recovery rate of the functional film layer in the cover plate 112 at 25℃. Thus, it can be ensured that the adhesive layer 111 has good deformation recovery capability and can restore to its original state after repeated bending, thereby improving the long-term bending durability of the display module.

[0052] By optimizing the storage modulus and creep recovery rate parameters of the adhesive layer 111 and the functional film layer, the display module of the present application not only maintains high refractive index characteristics, but also has excellent bending performance, which not only improves the optical performance of the display module, but also ensures its reliability and durability in actual application, and is suitable for application scenarios such as foldable display devices that need to be frequently bent.

[0053] The functional film layer in the cover plate 112 includes at least one of the following materials: polyacrylate, polyurethane, and polydimethylsiloxane.

[0054] Table 1 shows the structure parameters of the display module and the light efficiency improvement results

[0055] D1 / D2 (um) of the structure R pixel D1 / D2 (um) of the structure G pixel D1 / D2 (um) of the structure B pixel H1 / H2 (um) of the flat layer Light efficiency improvement results Scheme1 4.5 5.5 2.8 >10% Scheme2 4.5 34 2.8 >10% Scheme3 3.5 23 2.8 >8% Scheme4 0 0 2.8 >6% Scheme5 1-1 12.8 >4% Scheme6 6 4.5 5.5 3.2 >12% Scheme7 4.5 34 3.2 >12% Scheme8 3.5 23 3.2 >10% Scheme9 0 0 3.2 >6%

[0056] Table 1 lists different structure parameters of the display module of the present application and their corresponding light efficiency improvement results.

[0057] D1 / D2 represents the distance between the second opening bottom edge of the flat layer 109 and the first opening bottom edge of the light shielding layer 107, and H1 / H2 represents the thickness of the flat layer 109.

[0058] As shown in Table 1, when the thickness of the flat layer 109 is 2.8 microns, the light efficiency improvement effect gradually increases with the increase of D1 / D2. For example, in scheme 1, when the D1 / D2 of the red, green, and blue pixels are 6 microns, 4.5 microns, and 5.5 microns respectively, the light efficiency improvement result exceeds 10%. When the thickness of the flat layer 109 increases to 3.2 microns, the light efficiency improvement effect under the same D1 / D2 condition is more significant. For example, in scheme 6, the D1 / D2 of the red, green, and blue pixels are the same as those in scheme 1, but the light efficiency improvement result exceeds 12%.

[0059] Table 2 Parameter combinations of the adhesive layer 111 and the functional film layer (the glue material layer in the cover plate 112) and bending test results

[0060]

[0061] Table 2 lists different parameter combinations of the adhesive layer 111 and the functional film layer (the glue material layer in the cover plate 112) in the display module of the present application and their corresponding bending test results.

[0062] As shown in Table 2, the thickness, storage modulus, and creep recovery rate of the adhesive layer 111 and the functional film layer (the glue material layer in the cover plate 112) have a significant impact on the bending performance. For example, in scheme 7, scheme 8, and scheme 9, the 25°C storage modulus of the adhesive layer 111 is 55 kilopascals, the 70°C storage modulus is 11 kilopascals, and the 25°C creep recovery rate is 84%. These parameter combinations make the display panel pass the bending test (result: OK).

[0063] In particular, in scheme 9, the thickness of the adhesive layer 111 increases to 75 microns, and the thickness of the functional film layer (the glue material layer in the cover plate 112) is 0, which still passes the bending test. This indicates that under certain parameter combinations, the functional film layer can be omitted, thereby simplifying the structure and possibly reducing costs.

[0064] The display module proposed by the embodiments of the present application can not only significantly improve the light efficiency, but also ensure the bending performance of the display panel by optimizing the second opening size of the flat layer 109, the material parameters of the adhesive layer 111, and the functional film layer.

[0065] As an improvement, phase change material particles are also provided in the adhesive layer 111. These particles are used to absorb heat when the temperature of the display module increases and release heat when the temperature decreases, thereby playing a role in temperature regulation, which is conducive to improving the stability and reliability of the display module under different environmental temperatures. The phase change material can be selected from long-chain alkanes such as octadecane, the size of the phase change material particles is in the range of 1-5 microns, and the mass of the phase change material particles is 5%-15% of the mass of the adhesive layer 111.

[0066] As an improvement, in order to further improve the light extraction efficiency, a microlens array can be made on the surface of the adhesive layer 111. Such microlenses can be formed directly on the surface of the adhesive layer 111 by hot embossing or ultraviolet curing, etc. The diameter of the microlenses is in the range of 10-50 microns, and the height is in the range of 2-10 microns. Such microlenses can effectively reduce the loss of total reflection of light, thereby improving the light extraction efficiency in the normal viewing angle direction.

[0067] As an improvement, quantum dot material is also provided in the adhesive layer 111. Quantum dot material can convert part of the blue light into red and green light, thereby achieving a wider color gamut and higher color saturation. The quantum dot material can be selected to have a CdSe / ZnS core-shell structure, with a particle size in the range of 2-10 nanometers, and the mass of the quantum dot material is 0.1%-1% of the mass of the adhesive layer 111.

[0068] In the display module provided in the present application, since the refractive index of the adhesive layer is greater than the refractive index of the flat layer, and the refractive index of the optical adhesive layer is less than or equal to the refractive index of the flat layer, when the light emitted by the light-emitting device passes through these film layers in turn, refraction occurs, and when the light passes from the flat layer with a lower refractive index to the adhesive layer with a higher refractive index, it will be deflected towards the normal direction. This helps to direct the light that would otherwise propagate sideways to a direction closer to the normal viewing angle, thereby improving the light output efficiency in the normal viewing angle direction. In addition, the second opening of the flat layer forms a micro-optical structure, and since the adhesive layer fills in this opening, when the light reaches the inclined side wall of the opening, it will be reflected, further enhancing the ability to redirect the side light to the normal viewing angle direction. In particular, by optimizing the size and position of the second opening, the reflection effect is further strengthened, while ensuring that enough light enters the opening, there is enough side wall area to achieve effective reflection, thereby improving the light output efficiency in the normal viewing angle direction. In addition, by optimizing the relationship between the mechanical properties of the adhesive layer and the functional film layers of the cover plate, the display module can maintain good bending performance and adhesion at different temperatures, which is beneficial to improve the reliability and durability of the display module. The display module provided in the present application is suitable for application scenarios such as foldable display devices.

[0069] The embodiments of the present application have been described in detail above, and the contents of the specification should not be understood as limiting the scope of protection of the present application.

Claims

1. A display module, wherein, The display module comprises: a display panel comprising a pixel defining layer, a light emitting device, a light shielding layer, a filter film and a flat layer, the pixel defining layer is provided with a receiving portion, at least a part of the light emitting device is arranged in the receiving portion, the light shielding layer is provided with a first opening, the first opening overlaps with the receiving portion, at least a part of the filter film is arranged in the first opening, the flat layer is arranged on the filter film and the light shielding layer, the flat layer is provided with a second opening overlapping with the first opening of the light shielding layer, and the second opening exposes at least a part of the filter film; an optical adhesive layer arranged on the flat layer and the filter film; and a bonding adhesive layer arranged on the optical adhesive layer and at least partially filled in the second opening. The refractive index of the bonding adhesive layer is greater than the refractive index of the flat layer, and the refractive index of the optical adhesive layer is less than or equal to the refractive index of the flat layer. The optical adhesive layer comprises an organic substance, and a molecular chain of the organic substance has a -NH-COO- chain structure.

2. The display module of claim 1, wherein, The organic substance comprises a thermoplastic polyurethane elastomer.

3. The display module of claim 2, wherein, The refractive index of the flat layer is in a range of 1.5-1.54, the refractive index of the bonding adhesive layer is in a range of 1.55-1.65, and the refractive index of the optical adhesive layer is in a range of 1.45-1.

52.

4. The display module of claim 1, wherein, The size of the second opening of the flat layer is less than the size of the first opening of the light shielding layer.

5. The display module of claim 1, wherein, In a top view of the display module, a distance D1 between a bottom edge of the second opening of the flat layer on one side of the center of the filter film and a bottom edge of the first opening of the light shielding layer is greater than or equal to 1 / 50 of the diameter of the minimum circumscribed circle of the bottom of the second opening and less than or equal to 1 / 15 of the diameter of the minimum circumscribed circle of the bottom of the second opening, and a distance D2 between a bottom edge of the second opening of the flat layer on the other side of the center of the filter film and a bottom edge of the first opening of the light shielding layer is greater than or equal to 1 / 50 of the diameter of the minimum circumscribed circle of the bottom of the second opening and less than or equal to 1 / 15 of the diameter of the minimum circumscribed circle of the bottom of the second opening.

6. The display module of claim 5, wherein, In a top view of the display module, the bottom edge of the second opening of the flat layer is closer to the center of the filter film than the bottom edge of the first opening of the light shielding layer.

7. The display module of claim 5, wherein, An angle θ1 between a sidewall of the second opening of the flat layer on one side of the center of the filter film and a top surface of the filter film is less than 90°, and an angle θ2 between a sidewall of the second opening of the flat layer on the other side of the center of the filter film and the top surface of the filter film is less than 90°.

8. The display module of claim 1, wherein, A thickness H1 of a portion of the flat layer on one side of the center of the filter film and on the light shielding layer is greater than or equal to 3 times a distance H3 between a top surface of the flat layer and a top surface of the filter film and less than or equal to 7 times the distance H3.

9. The display module of claim 1, wherein, A thickness H2 of a portion of the flat layer on the other side of the center of the filter film and on the light shielding layer is greater than or equal to 3 times the distance H3 and less than or equal to 7 times the distance H3. The display module further comprises:

10. The display module of claim 1, wherein, ​ A cover plate is arranged on a surface of the adhesive layer away from the flat layer, the cover plate comprising a functional film layer, the functional film layer being in contact with the adhesive layer, a thickness of the functional film layer being greater than or equal to 1 / 8 of a thickness of the adhesive layer and less than or equal to 5 times the thickness of the adhesive layer.

11. The display module of claim 10, wherein, A sum of the thickness of the functional film layer and the thickness of the adhesive layer is less than or equal to 100 microns.

12. The display module of claim 10, wherein, The storage modulus of the adhesive layer at 25 DEG C is greater than or equal to 1 times the storage modulus of the functional film layer at 25 DEG C and less than or equal to 2 times the storage modulus of the functional film layer at 25 DEG C.

13. The display module of claim 12, wherein, The storage modulus of the adhesive layer at 25 DEG C is 25 kPa to 65 kPa.

14. The display module of claim 10, wherein, The storage modulus of the adhesive layer at 70 DEG C is greater than or equal to 1 / 2 of the storage modulus of the functional film layer at 70 DEG C and less than or equal to 1 times the storage modulus of the functional film layer at 70 DEG C.

15. The display module of claim 10, wherein, The creep recovery rate of the adhesive layer at 25 DEG C is greater than or equal to 80%, the creep recovery rate of the adhesive layer at 25 DEG C being greater than or equal to 0.8 times the creep recovery rate of the functional film layer at 25 DEG C and less than or equal to 1 times the creep recovery rate of the functional film layer at 25 DEG C.

16. The display module of claim 10, wherein, The functional film layer comprises polyethylene terephthalate.

17. The display module of claim 1, wherein, The optical adhesive layer further comprises inorganic matter, the inorganic matter comprising inorganic nano-particles.

18. The display module of claim 17, wherein, The inorganic nano-particles comprise zirconium oxide or titanium oxide.

19. The display module of claim 1, wherein, The adhesive layer has a transmittance greater than 90%.

20. A display device comprising: The display device comprises the display module according to any one of claims 1 to 19.

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