Display module and manufacturing method thereof

Abstract

The present application discloses a display module and a manufacturing method thereof. The display module comprises, in order from the display side to the viewing side: a display screen, a first absorptive polarizer, a first quarter-wave plate, an optical lens group, and a convex lens assembly, wherein the optical lens group and the convex lens assembly share an optical axis. The convex lens assembly comprises, in order from the viewing side to the display side, a convex lens, a second absorptive polarizer, and an optical integrated component comprising a second quarter-wave plate and a reflective polarizing film or a nano-imprinted metal grating coated on one side thereof, wherein the reflective polarizing film or the metal grating is attached to the second absorptive polarizer. The absorption axis of the first absorptive polarizer is parallel to the absorption axis of the second absorptive polarizer and forms a 45-degree angle with the fast axis of the first quarter-wave plate. The fast axis of the second quarter-wave plate forms a 45-degree angle with the grating extension direction of the metal grating, a 45-degree angle with the light transmission axis of the reflective polarizing film, and a 45-degree angle with the absorption axis of the second absorptive polarizer.

Description

Technical Field

[0001] The present application relates to the field of display, and in particular to a display module and a manufacturing method thereof. Background Art

[0002] The display modules used in existing virtual reality devices generally adopt a Pancake folded optical path solution to achieve ultra-short focus.

[0003] See also Figure 1 , which is an exploded schematic diagram of a display module that uses a Pancake folded optical path solution. Figure 1 As shown, the display module 100 includes, from the display side to the viewing side, a display screen assembly 110, a semi-transparent mirror 120, and a convex lens assembly 130. The display screen assembly 110 includes: a display screen 112, a first absorptive polarizer 114, and a first quarter-wave plate 116 adhered in sequence by transparent adhesive 90. The convex lens assembly 130 includes: a convex lens 132, a second absorptive polarizer 134, a reflective polarizer 136, a second quarter-wave plate 138, and an anti-reflection film 139 adhered in sequence by transparent adhesive 90. The folded optical path of the light emitted by the display screen 112 from the time it is incident on the first absorptive polarizer 114 to the time it is emitted from the convex lens 132 and enters the human eye to form an image is shown in FIG. Figure 1 As shown by the solid arrow. Since the light first enters the anti-reflection film 139 and passes through the reflective polarizer 136 (i.e. the light first enters the convex lens assembly 130 and passes through the reflective polarizer 136), it needs to undergo 15 times of reflection, scattering and transmission (as shown in FIG. Figure 1 As shown by the dotted arrow, the energy of the normal light path is weakened, and there is a problem of reducing the utilization rate of light energy. Summary of the Invention

[0004] The embodiments of the present application provide a display module and a manufacturing method thereof, which can solve the problem in the prior art that the folded light path of the display module needs to undergo too many reflections, scatterings and transmissions, thereby weakening the energy of the normal light path and reducing the utilization rate of light energy.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application provides a display module comprising, in order from the display side to the viewing side: a display screen assembly, an optical lens assembly, and a convex lens assembly, wherein the optical lens assembly and the convex lens assembly share an optical axis. The display screen assembly comprises, in order from the display side to the viewing side: a display screen, a first absorptive polarizer, and a first quarter-wave plate. The convex lens assembly comprises, in order from the viewing side to the display side, a convex lens, a second absorptive polarizer, and an optical integrated element, wherein the optical integrated element comprises the second quarter-wave plate and a reflective polarizing film or nano-imprinted metal grating coated on one side thereof, wherein the reflective polarizing film or metal grating is attached to the second absorptive polarizer. Among them, the absorption axis of the first absorbing polarizer is parallel to the absorption axis of the second absorbing polarizer, the fast axis of the second quarter wave plate is at an angle of 45 degrees to the grating extension direction of the metal grating, the fast axis of the second quarter wave plate is at an angle of 45 degrees to the transmission axis of the reflective polarizing film, the absorption axis of the first absorbing polarizer is at an angle of 45 degrees to the fast axis of the first quarter wave plate, and the absorption axis of the second absorbing polarizer is at an angle of 45 degrees to the fast axis of the second quarter wave plate.

[0007] In a second aspect, the present application provides a method for manufacturing a display module, comprising the following steps: coating a reflective polarizing film or a nano-imprinted metal grating on one side of a second quarter-wave plate to form an optical integrated component, wherein the fast axis of the second quarter-wave plate and the grating extension direction of the metal grating form an angle of 45 degrees, and the fast axis of the second quarter-wave plate and the light transmission axis of the reflective polarizing film form an angle of 45 degrees; attaching a second absorptive polarizer to one side of a convex lens, and attaching a reflective polarizing film or a metal grating to the second absorptive polarizer to form a convex lens assembly, wherein the absorption axis of the second absorptive polarizer and the fast axis of the second quarter-wave plate form an angle of 45 degrees; assembling the optical lens group in a bracket. ; The display screen, the first absorption polarizer and the first quarter-wave plate are sequentially bonded to form a display screen assembly, wherein the absorption axis of the first absorption polarizer and the fast axis of the first quarter-wave plate form an angle of 45 degrees; according to the principle that the normal of the physical center of the effective area of ​​the display screen and the optical axis of the optical lens group coincide with each other, the bracket equipped with the optical lens group is assembled to the display screen assembly through an active alignment machine; and based on the fact that the optical lens group and the convex lens assembly share a common optical axis and the absorption axis of the first absorption polarizer is parallel to the absorption axis of the second absorption polarizer, the convex lens assembly is assembled in the bracket through an active alignment machine to form a display module, wherein the side of the convex lens not attached to the second absorption polarizer faces the viewing side.

[0008] In an embodiment of the present application, by providing an optical integrated element with phase delay function and reflective polarization function (the optical integrated element includes a second quarter-wave plate and a reflective polarizing film or a nano-imprinted metal grating coated on one side thereof), the number of reflections, scatterings, and transmissions of the light emitted by the display screen in the folded optical path is reduced, the utilization rate of light energy is improved, and the thickness of the display module is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0010] Figure 1 This is an exploded diagram of a display module that uses a Pancake folded optical path solution.

[0011] Figure 2 An exploded view of an embodiment of a display module according to the present application;

[0012] Figure 3 for Figure 2 A cross-sectional view of an embodiment of a display module;

[0013] Figure 4 for Figure 2 A combined diagram of an embodiment of a display module;

[0014] Figure 5 is a cross-sectional schematic diagram of an embodiment of a display module according to the present application;

[0015] Figure 6 A flow chart of an embodiment of a method for manufacturing a display module according to the present application; and

[0016] Figure 7 FIG. 4 is a flow chart of another embodiment of a method for manufacturing a display module according to the present application. DETAILED DESCRIPTION

[0017] The embodiments of the present invention will be described below with reference to the accompanying drawings. In these drawings, the same reference numerals represent the same or similar components or method flows.

[0018] It must be understood that the words "comprise", "include" and the like used in this specification are used to indicate the existence of specific technical features, values, method steps, operation processes, components and / or components, but do not exclude the addition of more technical features, values, method steps, operation processes, components, components, or any combination of the above.

[0019] It should be understood that when a component is described as being “connected” or “coupled” to another component, it can be directly connected or coupled to the other component, and intervening components may be present. Conversely, when a component is described as being “directly connected” or “directly coupled” to another component, there are no intervening components.

[0020] See also Figures 2 to 4 , Figure 2 FIG1 is an exploded view of an embodiment of a display module according to the present application. Figure 3 for Figure 2 A cross-sectional schematic diagram of an embodiment of a display module, Figure 4 for Figure 2 The display module 200 can be applied to a virtual reality device that realizes the immersive feeling of virtual reality, and provides a virtual reality image for the left eye or right eye corresponding to the position of the user's left eye or right eye (that is, the virtual reality device includes two display modules 200). Figures 2 to 4 As shown, the display module 200 includes, from the display side (i.e., the light-emitting side of the display screen) to the viewing side (i.e., the side closest to the user's eyes), a display screen assembly 210, an optical lens assembly 220, and a convex lens assembly 230. The optical lens assembly 220 and the convex lens assembly 230 share a common optical axis (i.e., a common optical axis C). The display screen assembly 210 includes, from the display side to the viewing side, a display screen 212, a first absorbing polarizer 214, and a first quarter-wave plate 216. The display screen 212 may be, but is not limited to, an LCD screen or an OLED screen, for example, an LCD screen with a picture quality of 4K or higher (i.e., high picture quality), which has good contrast, a wide color gamut, and good color accuracy. The display screen 212 may be connected to an external circuit via a flexible printed circuit (FPC) 70. The thickness of the first absorptive polarizer 214 may be less than or equal to 0.08 mm and greater than or equal to 0.04 mm, and the polarization efficiency of the first absorptive polarizer 214 may be greater than or equal to 99.9%. The absorption axis of the first absorptive polarizer 214 and the fast axis of the first quarter-wave plate 216 form a 45-degree angle. The first quarter-wave plate 216 may delay the phase by π / 2 or an odd multiple thereof over the entire visible light band from 400 nm to 700 nm, with a delay accuracy of, but not limited to, ±5%.

[0021] In this embodiment, the optical lens assembly 220 may include, from the display side to the viewing side, a low-transmittance, high-reflection mirror 222 and a low-reflection concave lens 224. The reflectivity of the low-transmittance, high-reflection mirror 222 may be 65% ± 10%, and the transmittance of the low-transmittance, high-reflection mirror 222 may be 35% ± 10%. The low-transmittance, high-reflection mirror 222 may be a high-refractive-index optical resin lens. The material of the low-transmittance, high-reflection mirror 222 may have a density of 1.1 g / cm 3The optical resin can be used to reduce weight and thickness; the low-reflection concave lens 224 can be an aspherical, high-refractive-index optical resin lens. The refractive index of the low-reflection concave lens 224 can be greater than or equal to 1.9. The material of the low-reflection concave lens 224 can be selected from low-density (for example: 1.1g / cm 3 ) optical resin to reduce weight. In another embodiment, the optical lens assembly 220 may include a semi-transparent and semi-reflective mirror, wherein the transmittance and reflectance of the semi-transparent and semi-reflective mirror are 50% respectively.

[0022] In this embodiment, the convex lens assembly 230 includes a convex lens 232, a second absorptive polarizer 234, and an optical integrated element 236, which are laminated in sequence from the viewing side to the display side. The optical integrated element 236 includes a second quarter-wave plate 50 and a reflective polarizing film 52 coated on one side thereof. The reflective polarizing film 52 is attached to the second absorptive polarizer 234. The absorption axis of the first absorptive polarizer 214 is parallel to the absorption axis of the second absorptive polarizer 234. The fast axis of the second quarter-wave plate 50 and the transmission axis of the reflective polarizing film 52 form a 45-degree angle. The absorption axis of the second absorptive polarizer 234 and the fast axis of the second quarter-wave plate 50 also form a 45-degree angle. The material of the second quarter-wave plate 50 may be, but is not limited to, polycarbonate (PC), polyethylene terephthalate (PET), triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), or cycloolefin polymer (COP), and the temperature resistance requirement may be, but is not limited to, dry baking at 105 degrees Celsius for 1000 hours. The phase retardation accuracy reference value of the second quarter-wave plate 50 in the visible light band of 400 nm to 700 nm may be, but is not limited to, ±15%. The material of the reflective polarizing film 52 may include, but is not limited to, metals such as zirconium and titanium and their oxides.

[0023] In this embodiment, the folded optical path of the display module 200 may be as follows: light emitted by the display screen 212 passes through the first absorptive polarizer 214 to become P light, and the P light passes through the first quarter-wave plate 216 to be modulated into left-handed circularly polarized light. Part of the left-handed circularly polarized light passes through the low-transmittance, high-reflection mirror 222 and the low-reflection concave lens 224, and is then converted into S light by the second quarter-wave plate 50. The S light is reflected back to the second quarter-wave plate 50 by the reflective polarizing film 52 and modulated into right-handed circularly polarized light. Part of the right-handed circularly polarized light passes through the low-reflection concave lens 224, is reflected by the low-transmittance, high-reflection mirror 222, and passes through the low-reflection concave lens 224 again, and is then converted into P light by the second quarter-wave plate 50. The P light passes through the reflective polarizing film 52, the second absorptive polarizer 234, and the convex lens 232, and finally enters the human eye to form a magnified virtual image. Optically transparent adhesive is provided between the display screen 212 and the first absorptive polarizer 214, between the first absorptive polarizer 214 and the first quarter-wave plate 216, between the convex lens 232 and the second absorptive polarizer 234, and between the reflective polarizing film 52 and the second absorptive polarizer 234. Light emitted from the display screen 212 undergoes only three reflections, scatterings, and transmissions (from the first incident light incident on the convex lens assembly 230 to the light path passing through the second absorptive polarizer 234). This improves light energy utilization.

[0024] In another embodiment, one side of the second quarter-wave plate 50 is not coated with the reflective polarizing film 52, but rather a nano-imprinted metal grating. The metal grating is attached to the second absorptive polarizer 234, and the fast axis of the second quarter-wave plate 50 forms a 45-degree angle with the grating extension direction of the metal grating. The metal grating may be made of, but is not limited to, metals such as aluminum, silver, or titanium, and their alloys. In other words, the metal grating replaces the reflective polarizing film 52.

[0025] Therefore, the display module 200 can improve the clarity through the high-definition display screen 212; the display module 200 can reduce the stray light reflected from each interface through the linear polarizer with high polarization efficiency; the display module 200 can more accurately control the polarization state of the folded light path through the first quarter-wave plate 216 with high delay accuracy; the display module 200 can reduce the transmitted stray light through the low-transmittance and high-reflection mirror; the display module 200 can improve the clarity of the four corners of the picture and reduce distortion through the arrangement of the low-transmittance and high-reflection mirror 222, the low-reflection concave lens 224 and the convex lens 232; the display module 200 can use the optical integrated element 236 with phase delay function and reflective polarization function (the optical integrated element 236 includes the second quarter-wave plate 50 and the reflective polarizing film 52 coated on one side thereof) or nano-imprinted metal grating) is set to reduce the number of reflections, scatterings and transmissions that the light emitted by the display screen 212 undergoes in the folded light path (reducing the reflective polarizer 136 and anti-reflection film 139 included in the existing display module 100 and the transparent adhesive used for bonding them), thereby improving the utilization rate of light energy and reducing the thickness of the display module 200.

[0026] In one embodiment, the reflective polarizing film 52 or the metal grating can have a transmittance greater than or equal to 85±15% for P light, a reflectance greater than or equal to 85±15% for S light, and a transmittance less than or equal to 2% for S light. This reduces unnecessary light loss, maximizes the brightness of normal images, and improves stray light in direct transmission.

[0027] In one embodiment, the thickness of the reflective polarizing film 52 or the metal grating may be greater than or equal to 300 nanometers and less than or equal to 1 micrometer.

[0028] In one embodiment, the thickness of the second quarter wave plate 50 may be greater than or equal to 50 micrometers and less than or equal to 200 micrometers. Preferably, the thickness of the second quarter wave plate 50 may be 60 micrometers, 100 micrometers, or 180 micrometers.

[0029] In one embodiment, the side of the second quarter-wave plate 50 facing the reflective polarizing film 52 or the metal grating may be coated with an ultra-low reflective film, attached with an ultra-low reflective film, or attached with a lens coated with the ultra-low reflective film. Thus, the optical integrated component 236 can have a low reflectivity function.

[0030] In one embodiment, the reflectivity of the ultra-low reflection film layer or the ultra-low reflection film to visible light may be less than or equal to 0.5%.

[0031] In one embodiment, the thickness of the ultra-low reflection film layer or the ultra-low reflection film may be less than or equal to 1 micron. Preferably, the thickness of the ultra-low reflection film layer or the ultra-low reflection film may be less than or equal to 500 nanometers.

[0032] In one embodiment, the ultra-low reflection film layer or the ultra-low reflection film may include one or more layers of film material. The film material may include, but is not limited to, titanium oxide and silicon dioxide. The number of film material layers may be, but is not limited to, 6 or 8. When the ultra-low reflection film layer or the ultra-low reflection film includes multiple layers of film material, titanium oxide and silicon dioxide may be stacked in an alternating manner.

[0033] Please refer to Tables 1 and 2 below. Table 1 shows the measured data for the display module 100, and Table 2 shows the measured data for replacing the convex lens assembly 130 of the display module 100 with the convex lens assembly 230 of the present application. The optical integrated component 236 includes a second quarter-wave plate 50, a reflective polarizing film 52 or a metal grating, an ultra-low reflection film layer or an ultra-low reflection film, or a lens coated with such an ultra-low reflection film. As can be seen from Tables 1 and 2, while the difference in the reflectivity of the anti-reflection film is very small, the convex lens assembly 230 reduces harmful reflections within the material (i.e., reduces the reflective polarizer 136 and anti-reflection film 139 included in the existing display module 100, and the transparent adhesive used for bonding them). Therefore, the measured data for replacing the convex lens assembly 130 of the display module 100 with the convex lens assembly 230 of the present application shows a slight increase in both P-light transmittance and S-light reflectivity.

[0034] Table 1

[0035] Wavelength (nanometers) 400 425 450 475 500 525 550 P light transmittance (﹪) 88.4 89.2 90.8 90.5 90.9 90.5 91.4 S light transmittance (﹪) 87.7 89.3 90.2 90.6 90.3 90.4 90.9 Anti-reflection film reflectivity (﹪) 0.3 0.2 0.2 0.3 0.3 0.3 0.3 Wavelength (nanometers) 575 600 625 650 675 700 average P light transmittance (﹪) 91.4 91.5 91.6 91.6 91.7 91.7 90.86 S light transmittance (﹪) 90.7 90.9 91.2 91.1 91.3 91.3 90.45 Anti-reflection film reflectivity (﹪) 0.3 0.2 0.3 0.3 0.3 0.3 0.26

[0036] Table 2

[0037] Wavelength (nanometers) 400 425 450 475 500 525 550 P light transmittance (﹪) 89.5 89.9 90.4 91.1 91.0 91.3 91.5 S light transmittance (﹪) 88.9 89.9 90.3 90.7 91.2 90.9 91.3 Anti-reflection film reflectivity (﹪) 0.2 0.2 0.3 0.3 0.2 0.3 0.3 Wavelength (nanometers) 575 600 625 650 675 700 average P light transmittance (﹪) 91.9 91.8 91.9 91.8 91.9 92.0 91.22 S light transmittance (﹪) 91.3 91.7 91.9 91.8 92.0 91.8 91.04 Anti-reflection film reflectivity (﹪) 0.3 0.3 0.3 0.3 0.3 0.3 0.27

[0038] In one embodiment, see Figure 2 and Figure 3 The display module 200 may further include a bracket 240, in which the optical lens group 220 and the convex lens assembly 230 are assembled; based on the principle that the normal line of the physical center of the effective area of ​​the display screen 212 coincides with the optical axis, the bracket 240 is assembled to the display screen assembly 210.

[0039] In one embodiment, see Figure 2 and Figure 3In addition to the bracket 240, the display module 200 may also include a knob 250 and a retaining ring 260; the low-transmittance and high-reflection mirror 222, the low-reflection concave lens 224 and the convex lens assembly 230 are assembled in the bracket 240; the knob 250 is sleeved on the outside of the bracket 240, and the retaining ring 260 is clamped to the bracket 240 and limits the movement of the knob 250 along the optical axis; the bracket 240 is provided with a plurality of oblique guide grooves 242, and the plurality of oblique guide grooves 242 communicate with the inside and outside of the bracket 240; the low-transmittance and high-reflection mirror 222 is provided with a plurality of guide posts 60, and the plurality of guide posts 60 pass through the plurality of oblique guide grooves 242 (i.e., the guide posts 60 and the oblique guide grooves) 242 (one-to-one correspondence) and tightly fit with the knob 250; the low-reflection concave lens 224 can be assembled into the bracket 240 through a glue-dispensing and baking curing process (i.e., UV thermosetting adhesive 80 is applied to a preset position on the bracket 240, the low-reflection concave lens 224 is assembled thereon, and then the UV thermosetting adhesive 80 is irradiated with ultraviolet light for preliminary curing, and then baked in an oven to assemble the low-reflection concave lens 224 into the preset position of the bracket 240). When the knob 250 rotates circumferentially, it drives the multiple guide posts 60 to move along the multiple inclined guide grooves 242 to adjust the relative position between the low-transmittance and high-reflection mirror 222 and the low-reflection concave lens 224. Therefore, without increasing the actual thickness of the display module 200, a simple inclined rotating structure can be used to adjust the diopter by adjusting the relative position between the low-transmittance and high-reflection mirror 222 and the low-reflection concave lens 224 to accommodate the different vision of different users.

[0040] In another embodiment, see Figure 5 , which is a cross-sectional schematic diagram of an embodiment of a display module according to the present application, Figure 5 The display module 300 and Figure 3 The only difference between the display modules 200 is that: the low-reflection concave lens 224 is provided with a plurality of guide posts 60, and the plurality of guide posts 60 pass through a plurality of oblique guide grooves 242 and are tightly matched with the knob 250; the low-transmittance and high-reflection mirror 222 can be assembled in the bracket 240 by glue-dispensing and baking curing treatment (that is, after applying UV thermosetting glue 80 at a preset position of the bracket 240, the low-transmittance and high-reflection mirror 222 is assembled thereon, and then the UV thermosetting glue 80 is irradiated with ultraviolet light for preliminary curing, and then sent to the oven for baking to assemble the low-transmittance and high-reflection mirror 222 at the preset position of the bracket 240); when the knob 250 rotates in the circumferential direction, the plurality of guide posts 60 are driven to move along the plurality of oblique guide grooves 242 to adjust the relative position between the low-transmittance and high-reflection mirror 222 and the low-reflection concave lens 224.

[0041] See also Figure 6 , which is a flow chart of an embodiment of a method for manufacturing a display module according to the present application. Figure 6 The manufacturing method of the display module can be used to manufacture Figures 2 to 4 The display module 200, Figure 6The manufacturing method of the display module includes the following steps: coating a reflective polarizing film 52 or nano-imprinting the metal grating on one side of a second quarter-wave plate 50 to form an optical integrated component 236, wherein the fast axis of the second quarter-wave plate 50 and the grating extension direction of the metal grating form a 45-degree angle, and the fast axis of the second quarter-wave plate 50 and the transmission axis of the reflective polarizing film 52 form a 45-degree angle (step 310); attaching a second absorptive polarizer 234 to one side of a convex lens 232, and attaching the reflective polarizing film 52 or the metal grating to the second absorptive polarizer 234 to form a convex lens assembly 230, wherein In the embodiment, the absorption axis of the second absorptive polarizer 234 and the fast axis of the second quarter wave plate 50 form an angle of 45 degrees (step 320); the optical lens assembly 220 is assembled in the bracket 240 (step 330); the display screen 212, the first absorptive polarizer 214 and the first quarter wave plate 216 are sequentially attached to form the display screen assembly 210, wherein the absorption axis of the first absorptive polarizer 214 and the fast axis of the first quarter wave plate 216 form an angle of 45 degrees (step 340); according to the principle that the normal line of the physical center of the active area of ​​the display screen 212 coincides with the optical axis of the optical lens assembly 220, through active alignment (Active alignment) The bracket 240 equipped with the optical lens assembly 220 is assembled onto the display screen assembly 210 using an active alignment (AA) machine (step 350). Furthermore, based on the fact that the optical lens assembly 220 and the convex lens assembly 230 share a common optical axis (i.e., a common optical axis C) and the absorption axis of the first absorbing polarizer 214 and the absorption axis of the second absorbing polarizer 234 are parallel, the convex lens assembly 230 is assembled into the bracket 240 using an active alignment machine to form the display module 200, wherein the side of the convex lens 232 not attached to the second absorbing polarizer 234 faces the viewing side (step 360).

[0042] In one embodiment, see Figure 6 The step of forming the optical integrated component 236 in step 310 may further include: coating an ultra-low reflection film on the side of the second quarter-wave plate 50 facing the reflective polarizing film 52 or the metal grating, attaching an ultra-low reflection film, or attaching a lens coated with the ultra-low reflection film. When coating the ultra-low reflection film on the side of the second quarter-wave plate 50 facing the reflective polarizing film 52 or the metal grating, the temperature must be controlled below 95 degrees Celsius.

[0043] In one embodiment, see Figure 6In step 320, the second absorbing polarizer 234 can be attached to the convex lens 232 using an optical-grade OCA adhesive with 99% transmittance. The reflective polarizing film 52 or the metal grating can also be attached to the second absorbing polarizer 234 using an optical-grade OCA adhesive with 99% transmittance. The reflective polarizing film 52 or the metal grating can then be placed in a high vacuum chamber at 60 degrees Celsius for degassing for one hour to form the convex lens assembly 230. Furthermore, before attaching the reflective polarizing film 52 or the metal grating to the second absorbing polarizer 234, the absorption axis direction of the second absorbing polarizer 234 and the fast axis direction of the second quarter-wave plate 50 can be measured using a dedicated machine. Based on the 45-degree angle between the absorption axis of the second absorbing polarizer 234 and the fast axis of the second quarter-wave plate 50, the reflective polarizing film 52 or the metal grating can be precisely attached to the second absorbing polarizer 234.

[0044] In one embodiment, see Figure 2 、 Figure 3 and Figure 6 Since the optical lens assembly 220 may include a low-transmittance and high-reflection mirror 222 and a low-reflection concave lens 224, the low-transmittance and high-reflection mirror 222 and the low-reflection concave lens 224 share a common optical axis (i.e., a common optical axis C), the low-transmittance and high-reflection mirror 222 is provided with a plurality of guide posts 60; the bracket 240 is provided with a plurality of oblique guide grooves 242, and the plurality of oblique guide grooves 242 communicate with the interior and exterior of the bracket 240; therefore, step 330 may include: the plurality of guide posts 60 pass through the plurality of oblique guide grooves 242 to assemble the low-transmittance and high-reflection mirror 222 on the bracket 240. and using an active alignment machine, in conjunction with a dispensing and baking curing process for the low-reflection concave lens 224, so as to assemble the low-reflection concave lens 224 in the bracket 240 (i.e., applying UV thermosetting glue 80 to a preset position on the bracket 240, assembling the low-reflection concave lens 224 thereon, then irradiating the UV thermosetting glue 80 with ultraviolet light for preliminary curing, and then baking in an oven to assemble the low-reflection concave lens 224 at the preset position of the bracket 240, wherein the baking temperature may be, but not limited to, 80 degrees Celsius, and the baking time may be, but not limited to, 2 hours). In addition, in this embodiment, after step 360, the manufacturing method of the display module may further include: sleevedly placing the knob 250 on the outer side of the bracket 240 so that the plurality of guide posts 60 are tightly fitted with the knob 250; and assembling the snap ring 260 to clamp the bracket 240 and limit the movement of the knob 250 along the optical axis. Therefore, when the knob 250 rotates along the circumferential direction, the plurality of guide posts 60 are driven to move along the plurality of inclined guide slots 242 to adjust the relative position between the low-transmittance and high-reflection mirror 222 and the low-reflection concave lens 224 .

[0045] In another embodiment, see Figure 5 and Figure 6Since the optical lens assembly 220 may include a low-transmittance and high-reflection mirror 222 and a low-reflection concave lens 224, the low-transmittance and high-reflection mirror 222 and the low-reflection concave lens 224 share a common optical axis (i.e., a common optical axis C), the low-reflection concave lens 224 is provided with a plurality of guide posts 60; the bracket 240 is provided with a plurality of oblique guide grooves 242, and the plurality of oblique guide grooves 242 communicate with the interior and exterior of the bracket 240; therefore, step 330 may include: performing a dispensing and baking curing process on the low-transmittance and high-reflection mirror 222 to assemble the low-transmittance and high-reflection mirror 222 on the bracket 240. (i.e., after applying UV thermosetting glue 80 at a preset position of the bracket 240, the low-transmittance and high-reflection mirror 222 is assembled thereon, and then the UV thermosetting glue 80 is irradiated with ultraviolet light for preliminary curing, and then sent to an oven for baking to assemble the low-transmittance and high-reflection mirror 222 at the preset position of the bracket 240, wherein the baking temperature may be but not limited to 80 degrees Celsius, and the baking time may be but not limited to 2 hours); and a plurality of guide posts 60 pass through a plurality of oblique guide grooves 242 to assemble the low-reflection concave lens 224 in the bracket 240. In addition, in this embodiment, after step 360, the manufacturing method of the display module may further include: sleeved the knob 250 on the outside of the bracket 240 so that the plurality of guide posts 60 are tightly fitted with the knob 250; and assembled the snap ring 260 to clamp the bracket 240 and limit the movement of the knob 250 along the optical axis. Therefore, when the knob 250 rotates along the circumferential direction, the plurality of guide posts 60 are driven to move along the plurality of inclined guide slots 242 to adjust the relative position between the low-transmittance and high-reflection mirror 222 and the low-reflection concave lens 224 .

[0046] In one embodiment, see Figure 6 In step 340, the first absorbing polarizer 214 can be attached to the display screen 212 using an optical-grade OCA adhesive with 99% transmittance. The first quarter-wave plate 216 can also be attached to the first absorbing polarizer 214 using an optical-grade OCA adhesive with 99% transmittance. The adhesive is then placed in a high-vacuum chamber at 60 degrees Celsius for degassing for one hour to form the display screen assembly 210. Furthermore, before attaching the first quarter-wave plate 216 to the first absorbing polarizer 214, the absorption axis direction of the first absorbing polarizer 214 and the fast axis direction of the first quarter-wave plate 216 can be measured using a dedicated machine. Based on the 45-degree angle between the absorption axis of the first absorbing polarizer 214 and the fast axis of the first quarter-wave plate 216, the first quarter-wave plate 216 can be precisely attached to the first absorbing polarizer 214.

[0047] In one embodiment, see Figure 6 In step 350, assembling the bracket 240 equipped with the optical lens assembly 220 to the display screen assembly 210 may include assembling the bracket 240 equipped with the optical lens assembly 220 to the display screen assembly 210 by gluing. The gluing method may be, but is not limited to, the glue-baking and curing process.

[0048] In one embodiment, see Figure 6 Step 360 may include: based on the fact that the optical lens group 220 and the convex lens assembly 230 share a common optical axis (i.e., a common optical axis C) and the absorption axis of the first absorbing polarizer 214 and the absorption axis of the second absorbing polarizer 234 are parallel, an active alignment machine is used, and the convex lens assembly 230 is subjected to a dispensing and baking curing process to assemble the convex lens assembly 230 in the bracket 240 (i.e., UV thermosetting glue 80 is dispensed at a preset position on the bracket 240, the convex lens assembly 230 is assembled thereon, and then the UV thermosetting glue 80 is irradiated with ultraviolet light for preliminary curing, and then sent to an oven for baking, so as to assemble the convex lens assembly 230 at the preset position of the bracket 240, wherein the baking temperature may be, but not limited to, 80 degrees Celsius, and the baking time may be, but not limited to, 2 hours).

[0049] In one embodiment, see Figure 7 , which is a flow chart of another embodiment of a method for manufacturing a display module according to the present application. In addition to steps 310 to 360 described above, the method for manufacturing a display module may further include performing a functional test procedure on the display module 200 (step 370). The functional test procedure includes testing black point, optical modulation transfer function (MTF) performance, brightness, chromaticity, and power. When the test results of the display module 200 meet shipping standards, the display module 200 is considered complete.

[0050] It should be noted that if there is no causal relationship between the above steps, this application does not limit the order of their execution.

[0051] In summary, in the embodiments of the present application, the display module can reduce the number of reflections, scatterings, and transmissions of light emitted by the display screen in the folded light path by setting an optical integrated component with a phase delay function and a reflective polarization function, thereby improving the utilization rate of light energy and reducing the thickness of the display module. The display module can improve the clarity of the display screen by using a high-definition display screen. The display module can reduce the stray light reflected from each interface by using a linear polarizer with high polarization efficiency. The display module can more accurately control the polarization state of the folded light path by using a first quarter-wave plate with high delay accuracy. The display module can reduce the transmitted stray light by using a low-transmittance and high-reflection mirror. The display module can improve the clarity of the four corners of the picture and reduce distortion by setting a low-transmittance and high-reflection mirror, a low-reflection concave lens, and a convex lens. The display module can adjust the diopter by adjusting the relative position between the low-transmittance and high-reflection mirror and the low-reflection concave lens through a simple inclined rotation structure to accommodate the different vision of different users. The manufacturing method of the display module can ensure the optical consistency of the display module through automatic alignment and automatic assembly of the AA machine, effectively reducing the feeling of dizziness. The display module manufacturing method can first measure the absorption axis direction of the second absorbing polarizer, the fast axis direction of the second quarter-wave plate, the absorption axis direction of the first absorbing polarizer, and the fast axis direction of the first quarter-wave plate using a dedicated machine. Then, subsequent assembly is carried out to precisely control the polarization state and reduce stray light images caused by abnormal polarization state.

[0052] Although the above-described components are included in the drawings of this application, it does not exclude the use of more additional components to achieve better technical effects without violating the spirit of the invention.

[0053] While the present invention is described using the above embodiments, it should be noted that these descriptions are not intended to limit the present invention. On the contrary, the present invention encompasses modifications and similar arrangements that are obvious to those skilled in the art. Therefore, the scope of the claims should be interpreted in the broadest manner to encompass all obvious modifications and similar arrangements.

Claims

1. A display module, characterized in that: The device comprises, from the display side to the viewing side, a display screen assembly, an optical lens group, and a convex lens assembly, wherein the optical lens group and the convex lens assembly share a common optical axis; The display screen assembly includes, from the display side to the viewing side, a display screen, a first absorbing polarizer, and a first quarter-wave plate; The convex lens assembly includes a convex lens, a second absorbing polarizer, and an optical integrated component laminated in sequence from the viewing side to the display side. The optical integrated component includes a second quarter-wave plate and a reflective polarizing film or a nano-imprinted metal grating coated on one side thereof. The reflective polarizing film or the metal grating is attached to the second absorbing polarizer. The absorption axis of the first absorbing polarizer is parallel to the absorption axis of the second absorbing polarizer, the fast axis of the second quarter-wave plate is at an angle of 45 degrees to the grating extension direction of the metal grating, the fast axis of the second quarter-wave plate is at an angle of 45 degrees to the transmission axis of the reflective polarizing film, the absorption axis of the first absorbing polarizer is at an angle of 45 degrees to the fast axis of the first quarter-wave plate, and the absorption axis of the second absorbing polarizer is at an angle of 45 degrees to the fast axis of the second quarter-wave plate; Wherein, the display module further includes a bracket, and the optical lens group and the convex lens assembly are assembled in the bracket; the display screen is an LCD screen or an OLED screen.

2. The display module according to claim 1, wherein: The reflective polarizing film or the metal grating has a transmittance to P light greater than or equal to 85±15﹪, a reflectance to S light greater than or equal to 85±15﹪, and a transmittance to S light less than or equal to 2﹪.

3. The display module according to claim 1, wherein: The thickness of the reflective polarizing film or the metal grating is greater than or equal to 300 nanometers and less than or equal to 1 micrometer.

4. The display module according to claim 1, wherein: The thickness of the second quarter-wave plate is greater than or equal to 50 micrometers and less than or equal to 200 micrometers.

5. The display module according to claim 1, wherein: According to the principle that the normal line of the physical center of the effective area of ​​the display screen coincides with the optical axis, the bracket is assembled to the display screen assembly.

6. The display module according to claim 5, characterized in that The optical lens group includes a low-transmittance high-reflection mirror and a low-reflection concave lens in sequence from the display side to the viewing side.

7. The display module according to claim 6, characterized in that The optical system further comprises a knob and a retaining ring; the low-transmittance and high-reflection mirror, the low-reflection concave lens, and the convex lens assembly are assembled in the bracket; the knob is sleeved on the outside of the bracket, and the retaining ring is engaged with the bracket and limits the movement of the knob along the optical axis; the bracket is provided with a plurality of oblique guide grooves, which communicate with the interior and exterior of the bracket; the low-transmittance and high-reflection mirror or the low-reflection concave lens is provided with a plurality of guide posts, which pass through the plurality of oblique guide grooves and are tightly fitted with the knob; When the knob rotates along the circumferential direction, the plurality of guide posts are driven to move along the plurality of inclined guide grooves to adjust the relative position between the low-transmittance and high-reflection mirror and the low-reflection concave lens.

8. The display module according to claim 1, wherein: The side of the second quarter wave plate opposite to the reflective polarizing film or the metal grating is coated with an ultra-low reflection film, adhered with an ultra-low reflection film, or adhered with a lens coated with the ultra-low reflection film.

9. The display module according to claim 8, characterized in that: The reflectivity of the ultra-low reflection film layer or the ultra-low reflection film to visible light is less than or equal to 0.5%.

10. The display module according to claim 8, wherein: The thickness of the ultra-low reflection film layer or the ultra-low reflection film is less than or equal to 1 micron.

11. The display module according to claim 8, wherein The ultra-low reflection film layer or the ultra-low reflection film includes one or more layers of film materials.

12. A method for manufacturing a display module, characterized in that: The following steps are involved: A reflective polarizing film or a nano-imprinted metal grating is plated on one side of a second quarter-wave plate to form an optical integrated component, wherein the fast axis of the second quarter-wave plate and the grating extension direction of the metal grating form an angle of 45 degrees, and the fast axis of the second quarter-wave plate and the transmission axis of the reflective polarizing film form an angle of 45 degrees; Attaching a second absorbing polarizer to one side of a convex lens, and attaching the reflective polarizing film or the metal grating to the second absorbing polarizer to form a convex lens assembly, wherein the absorption axis of the second absorbing polarizer and the fast axis of the second quarter-wave plate form an angle of 45 degrees; Assemble the optical lens assembly in the bracket; Laminating a display screen, a first absorbing polarizer, and a first quarter-wave plate in sequence to form a display screen assembly, wherein an absorption axis of the first absorbing polarizer and a fast axis of the first quarter-wave plate form an angle of 45 degrees, and the display screen is an LCD screen or an OLED screen; According to the principle that the normal line of the physical center of the effective area of ​​the display screen and the optical axis of the optical lens group coincide with each other, the bracket equipped with the optical lens group is assembled onto the display screen assembly by an active alignment machine; and Based on the fact that the optical lens group and the convex lens assembly share a common optical axis and the absorption axis of the first absorptive polarizer is parallel to the absorption axis of the second absorptive polarizer, the convex lens assembly is assembled in the bracket through the active alignment machine to form a display module, wherein the side of the convex lens not attached to the second absorptive polarizer faces the viewing side.

13. The method for manufacturing a display module according to claim 12, wherein: The optical lens assembly includes a low-transmittance, high-reflection mirror and a low-reflection concave lens, the low-transmittance, high-reflection mirror and the low-reflection concave lens share a common optical axis, and the low-transmittance, high-reflection mirror is provided with a plurality of guide posts; the bracket is provided with a plurality of oblique guide grooves, the plurality of oblique guide grooves connecting the interior and exterior of the bracket; The step of assembling the optical lens assembly in the bracket includes: The plurality of guide posts pass through the plurality of oblique guide slots to assemble the low-transmittance and high-reflection mirror in the bracket; as well as The active alignment machine is used to perform a dispensing, baking and curing process on the low-reflection concave lens, so as to assemble the low-reflection concave lens in the bracket.

14. The method for manufacturing a display module according to claim 12, wherein: The optical lens assembly includes a low-transmittance, high-reflection mirror and a low-reflection concave lens, the low-transmittance, high-reflection mirror and the low-reflection concave lens share a common optical axis, and the low-reflection concave lens is provided with a plurality of guide posts; the bracket is provided with a plurality of oblique guide grooves, and the plurality of oblique guide grooves communicate the interior and exterior of the bracket; The step of assembling the optical lens assembly in the bracket includes: Performing a dispensing, baking and curing process on the low-transmittance and high-reflection mirror to assemble the low-transmittance and high-reflection mirror in the bracket; as well as The plurality of guide posts pass through the plurality of oblique guide grooves so as to assemble the low-reflection concave lens in the bracket.

15. The method for manufacturing a display module according to claim 13 or 14, characterized in that: The manufacturing method of the display module further includes: Sleeve the knob on the outer side of the bracket so that the plurality of guide posts are tightly fitted with the knob; and A snap ring is assembled to snap onto the bracket and limit the movement of the knob along the optical axis.

16. The method for manufacturing a display module according to claim 12, wherein: The step of assembling the convex lens assembly in the bracket through the active alignment machine based on the fact that the optical lens group and the convex lens assembly share a common optical axis and the absorption axis of the first absorptive polarizer is parallel to the absorption axis of the second absorptive polarizer includes: based on the fact that the optical lens group and the convex lens assembly share a common optical axis and the absorption axis of the first absorptive polarizer is parallel to the absorption axis of the second absorptive polarizer, the convex lens assembly is assembled in the bracket through the active alignment machine and a glue dispensing, baking and curing process is performed on the convex lens assembly.

17. The method for manufacturing a display module according to claim 12, wherein: The step of forming the optical integrated component further comprises: An ultra-low reflection film layer is plated on a side of the second quarter-wave plate opposite to the reflective polarizing film or the metal grating, an ultra-low reflection film is adhered, or a lens coated with the ultra-low reflection film is adhered.

18. The method for manufacturing a display module according to claim 12, wherein: Also includes: A functional testing procedure is performed on the display module.

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