CN216792594U

CN216792594U - Display module

Info

Publication number: CN216792594U
Application number: CN202220594884.8U
Authority: CN
Inventors: 庞超; 米凌云; 蓝鹰
Original assignee: Luxvisions Innovation Ltd
Current assignee: Luxvisions Innovation Ltd
Priority date: 2022-03-18
Filing date: 2022-03-18
Publication date: 2022-06-21
Anticipated expiration: 2032-03-18

Abstract

The application discloses a display module. The display module comprises a display screen assembly, an optical lens assembly and a convex lens assembly in sequence from a display side to a viewing side, and the optical lens assembly and the convex lens assembly share an optical axis. The display screen assembly includes: the display screen, the linear polarizer and the first achromatic quarter-wave plate are sequentially attached from the display side to the viewing side. The optical lens group comprises a low-transmittance high-reflectivity lens and a low-reflectivity concave lens from a display side to a viewing side in sequence. The convex lens assembly includes: a low-reflection convex lens, a second achromatic quarter wave plate, a reflective polarizing film, a circular polarizer and an optical functional sheet. The transmission axis of the linear polarizer is parallel to the transmission axis of the reflective polarizing film, the transmission axis of the linear polarizer and the fast axis of the first achromatic quarter-wave plate form an included angle of 45 degrees, and the transmission axis of the reflective polarizing film and the fast axis of the second achromatic quarter-wave plate form an included angle of 45 degrees.

Description

Display module

Technical Field

The present application relates to the field of display, and more particularly, to a display module.

Background

The display module used by the existing virtual reality equipment usually adopts a Pancake folding light path scheme to realize ultra-short focus.

Please refer to fig. 1, which is an exploded view of an optical structure of a conventional display module using a Pancake folded optical path scheme. As shown in fig. 1, the display module 100 sequentially includes, from the display side to the viewing side: a display screen assembly 110, a half mirror 120 and a convex lens assembly 130; the phase retarder 140 with transparent adhesive and the absorptive polarizer 150 are respectively attached to the display screen 160 to form the display screen assembly 110; the transmittance and the reflectivity of the semi-transparent semi-reflective mirror 120 are 50% respectively; the retarder 170 with transparent adhesive, the transflective film 180 and the absorptive polarizer 190 are sequentially attached to the convex lens 192 to form the convex lens assembly 130.

However, since the absorption polarizer 190 reflects the light reflected by human eyes again to reach the pupil, the interference stray light image is formed. In addition, the folded light path (as shown by the arrow in fig. 1) of the display module 100 needs to undergo multiple reflections, scattering and transmissions, which may cause stray light images and generate a plurality of abnormal images with different light and shade, which not only reduces the definition of the normal image, but also is easy to cause discomfort and cause visual fatigue.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a display module, which can solve the problems of high stray light, darker picture and low definition of the display module adopting the Pancut folding light path scheme in the prior art.

In order to solve the technical problem, the present application is implemented as follows:

the application provides a display module, include in proper order by showing side to watching side: the display screen assembly, the optical lens assembly and the convex lens assembly share an optical axis. The display screen assembly includes: the display screen, the linear polarizer and the first achromatic quarter-wave plate are sequentially attached from the display side to the viewing side, one side of the first achromatic quarter-wave plate is provided with an antireflection film, and the other side of the first achromatic quarter-wave plate is attached to the linear polarizer; the optical lens group comprises the following components in sequence from a display side to a viewing side: a low-transmittance high-reflection mirror and a low-reflection concave lens. The convex lens assembly includes: the low anti-convex lens, the second achromatic quarter wave plate, the reflective polarizing film, the circular polarizer and the optical function sheet are sequentially attached, or the low anti-convex lens, the circular polarizer, the reflective polarizing film, the circular polarizer and the optical function sheet are sequentially attached. The transmission axis of the linear polarizer is parallel to the transmission axis of the reflective polarizing film, the transmission axis of the linear polarizer and the fast axis of the first achromatic quarter-wave plate form an included angle of 45 degrees, and the transmission axis of the reflective polarizing film and the fast axis of the second achromatic quarter-wave plate form an included angle of 45 degrees.

In the embodiment of the application, the display module can improve the picture brightness and improve the definition to a certain extent by arranging the circular polarizer; the display module can be provided with an antireflection film on one side of the first achromatic quarter-wave plate, so that the light transmittance is increased; the display module can reduce transmission stray light by arranging the low-transmittance high-reflectivity mirror; the display module can improve the definition of a view field through the arrangement of the low-reflection concave lens; the display module can improve the definition of four corners of a picture and reduce distortion through the arrangement of the low-transmittance high-reflection mirror, the low-reflection concave lens and the low-reflection convex lens; the display module can reduce stray light images generated by reflection through the arrangement of the optical functional sheet. Therefore, the display module of the application can improve the comfort level of user experience.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is an exploded schematic view of an optical structure of a conventional display module adopting a Pancake folded optical path scheme;

FIG. 2 is an exploded view of one embodiment of a display module according to the present application;

FIG. 3 is a cross-sectional view of one embodiment of the display module of FIG. 2;

FIG. 4 is a combination diagram of one embodiment of the display module of FIG. 2;

FIG. 5 is a cross-sectional view of one embodiment of the display screen assembly of FIG. 3;

FIG. 6 is a schematic cross-sectional view of one embodiment of the convex lens assembly of FIG. 3;

FIG. 7 is a schematic cross-sectional view of one embodiment of a convex lens assembly of the present application;

FIG. 8 is a schematic structural diagram of an embodiment of the optically functional sheet of FIG. 6;

FIG. 9 is a cross-sectional view of another embodiment of a display module according to the present application;

FIG. 10 is a cross-sectional view of another embodiment of a display module according to the present application;

FIG. 11 is a cross-sectional view of another embodiment of a display module according to the present application;

FIG. 12 is a flow chart of one embodiment of a method for manufacturing a display module according to the present application; and

FIG. 13 is a flow chart of another embodiment of a method for manufacturing a display module according to the present application.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the drawings, the same reference numerals indicate the same or similar components or process flows.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, values, method steps, operations, components, and/or components, but do not preclude the presence or addition of further features, values, method steps, operations, components, and/or groups thereof.

It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is described as being "directly connected" or "directly coupled" to another element, there are no intervening elements present.

Referring to fig. 2 to 4, fig. 2 is an exploded view of an embodiment of a display module according to the present application, fig. 3 is a schematic cross-sectional view of the embodiment of the display module of fig. 2, and fig. 4 is a combined view of the embodiment of the display module of fig. 2. The display module 200 may be applied to a virtual reality device that implements an immersive sense of virtual reality, and provides a virtual reality image of a left eye or a right eye corresponding to a position of a left eye or a right eye of a user (i.e., the virtual reality device includes two display modules 200). As shown in fig. 2, the display module 200 sequentially includes, from a display side (i.e., a light-emitting side of the display screen) to a viewing side (i.e., a side close to human eyes of a user): the display screen assembly 210, the optical lens assembly 220 and the convex lens assembly 230, and the optical lens assembly 220 and the convex lens assembly 230 share an optical axis (i.e. a common optical axis C).

In this embodiment, please refer to fig. 5, which is a schematic cross-sectional view of an embodiment of the display panel assembly of fig. 3. The display screen assembly 210 includes: the display screen 212, the linear polarizer 214 and the first achromatic quarter wave plate 216 are sequentially attached from the display side to the viewing side, one side of the first achromatic quarter wave plate 216 is provided with an anti-reflection film 50, and the other side of the first achromatic quarter wave plate 216 is attached to the linear polarizer 214. The display screen 212 may be, but is not limited to, an LCD screen or an OLED screen, for example: the LCD screen with the image quality of more than 4K (namely high image quality) has good contrast, wide color gamut range and good color accuracy; the display screen 212 may be connected to an external circuit through a flexible circuit board (FPC) 70; the thickness of the linear polarizer 214 is less than or equal to 0.08 mm, and the polarization efficiency of the linear polarizer 214 is greater than or equal to 99.9%, so that stray light reflected by each interface can be reduced; the first achromatic quarter waveplate 216 is anti-reflection treated to have an anti-reflection film 50; the first achromatic quarter wave plate 216 delays the phase by pi/2 or an odd multiple thereof in a visible light wave band from 400 nm to 700 nm, and the delay precision of the first achromatic quarter wave plate 216 can be, but is not limited to, plus or minus 5% (common in the industry, plus or minus 15%); the first achromatic quarter waveplate 216 may be made of, but not limited to, Polycarbonate (PC), polyethylene terephthalate (PET), cellulose Triacetate (TAC), polymethyl methacrylate (PMMA), or Cyclic Olefin Polymer (COP); the transmission axis of the linear polarizer 214 is at a 45 degree angle to the fast axis of the first achromatic quarter waveplate 216.

In this embodiment, the display screen 212, the linear polarizer 214, the first achromatic quarter-wave plate 216, and the anti-reflection film 50 are sequentially bonded together by an OCA glue with 99% transmittance (i.e., a high transmittance OCA glue 90). In an embodiment, the display screen 212, the linear polarizer 214, and the first achromatic quarter-wave plate 216 are sequentially bonded together by an OCA glue with 99% transmittance, and the anti-reflection film 50 is plated on the first achromatic quarter-wave plate 216; at this time, the reflectivity of the anti-reflection film 50 is within a visible light band of 400 nm to 700 nm, which can meet the requirement that the average reflectivity is less than or equal to 0.25%, and is more beneficial to improvement of stray light.

In the present embodiment, referring to fig. 2 and fig. 3, the optical lens assembly 220 sequentially includes, from the display side to the viewing side: a low-transmittance high-reflectivity mirror 222 and a low-reflectivity concave lens 224. The reflectivity of the low-transmittance high-reflectance mirror 222 can be 65%, the transmittance of the low-transmittance high-reflectance mirror 222 can be 35%, the low-transmittance high-reflectance mirror 222 can be a high-refractive-index optical resin lens, and the low-transmittance high-reflectance mirror 222 can be made of a material with a density of 1.1g/cm³The optical resin of (1); the low inverse concave lens 224 may be an aspheric, high refractive index optical resin lens, the refractive index of the low inverse concave lens 224 may be greater than or equal to 1.9, and the material of the low inverse concave lens 224 may be selected from a low density (e.g., 1.1 g/cm)³) The optical resin of (1).

In this embodiment, please refer to fig. 6, which is a schematic cross-sectional view of an embodiment of the convex lens component of fig. 3. The convex lens assembly 230 includes: the low-reflection convex lens 232, the second achromatic quarter-wave plate 234, the reflective polarizing film 236, the circular polarizer 238 and the optical function sheet 239, wherein a transmission axis of the reflective polarizing film 236 and a fast axis of the second achromatic quarter-wave plate 234 form an included angle of 45 degrees, a transmission axis of the linear polarizer 214 and a transmission axis of the reflective polarizing film 236 form an included angle of 45 degrees, and the optical function sheet 239 has functions of anti-glare, anti-reflection and anti-fingerprint.

Referring to fig. 6, in the present embodiment, the low anti-convex lens 232, the second achromatic quarter-wave plate 234, the reflective polarizer 236, the circular polarizer 238 and the optical functional sheet 239 are sequentially attached, but the present invention is not limited thereto. In another embodiment, the low-inverse convex lens 232, the circular polarizer 238, the reflective polarizer 236, the second achromatic quarter-wave plate 234 and the optical functional plate 239 are sequentially attached to each other (as shown in fig. 7, fig. 7 is a cross-sectional view of an embodiment of the convex lens assembly of the present application).

Please refer to fig. 8, which is a schematic structural diagram of an embodiment of the optical functional sheet of fig. 6. The optical functional sheet 239 may sequentially include: since the low-reflectivity convex lens 232, the second achromatic quarter-wave plate 234, the reflective polarizing film 236, the circular polarizer 238 and the optical function sheet 239 are sequentially attached to the optical substrate 40 and the optical film 42 with anti-glare, anti-reflection and anti-fingerprint functions, the optical substrate 40 is attached to the circular polarizer 238, but the present disclosure is not limited thereto. In another embodiment, when the low-reflectivity convex lens 232, the circular polarizer 238, the reflective polarizer 236, the second achromatic quarter-wave plate 234 and the optical function plate 239 are sequentially bonded, the optical substrate 40 is bonded to the second achromatic quarter-wave plate 234.

In the present embodiment, referring to fig. 2 and fig. 3, the low anti-convex lens 232 may be an aspheric and high refractive index optical resin lens; the refractive index of the low inverse convex lens 232 may be greater than or equal to 1.9; the material of the low-reflection convex lens 232 can be selected from low density (e.g. 1.1 g/cm)³) The optical resin of (1); the second achromatic quarter waveplate 234 may be made of, but not limited to, PC, PET, TAC, PMMA, or COP; the reflective polarizing film 236 may have a transmittance of 90% or more for P light, a reflectance of 99% or more for S light, and a transmittance of 1% or less for S light.

In one embodiment, the low anti-convex lens 232, the second achromatic quarter-wave plate 234, the reflective polarizing film 236, the circular polarizer 238 and the optical functional sheet 239 are sequentially bonded together through an OCA adhesive (i.e., the high-transmittance OCA adhesive 90) with a transmittance of 99%. In another embodiment, the low-inverse convex lens 232, the circular polarizer 238, the reflective polarizer 236, the second achromatic quarter wave plate 234 and the optical function plate 239 are sequentially bonded together by using 99% transmittance OCA glue (i.e., high transmittance OCA glue 90).

In the present embodiment, referring to fig. 2 and fig. 3, the side of the low-reflection convex lens 232 to which the second achromatic quarter-wave plate 234 is not attached faces the display side. Thus, the folded optical path of the display module 200 may be: the light emitted from the display 212 passes through the linear polarizer 214 to become P-light, which is modulated into left-handed circularly polarized light after passing through the first achromatic quarter waveplate 216, and a portion of the left-handed circularly polarized light passes through the anti-reflection film 50, the low-transmittance high-reflectivity lens 222, the low-reflectivity concave lens 224 and the low-reflectivity convex lens 232, and then converted into S light by the second achromatic quarter waveplate 234, the S light is reflected back to the second achromatic quarter waveplate 234 by the reflective polarizing film 236 to be modulated into right-handed circularly polarized light, the right-handed circularly polarized light passes through the low-reflective convex lens 232 and the low-reflective concave lens 224 and is partially reflected by the low-transmissive high-reflective mirror 222 to pass through the low-reflective concave lens 224 and the low-reflective convex lens 232 again, then the second achromatic quarter wave plate 234 is converted into P light, and the P light passes through the reflective polarizing film 236, the circular polarizer 238 and the optical function plate 239 and finally enters human eyes to form an amplified virtual image.

In another embodiment, when the convex lens assembly 230 of fig. 3 is replaced by a low inverse convex lens 232, a circular polarizer 238, a reflective polarizing film 236, a second achromatic quarter-wave plate 234 and an optical functional plate 239 sequentially attached, and a side of the low inverse convex lens 232 to which the circular polarizer 238 is not attached faces the display side, the folded optical path of the display module 200 may be: the light emitted from the display 212 passes through the linear polarizer 214 to become P light, the P light passes through the first achromatic quarter wave plate 216 and is modulated into left-handed circularly polarized light, a part of the left-handed circularly polarized light passes through the anti-reflection film 50, the low-transmittance high-reflectance mirror 222, the low-reflectance concave lens 224 and the low-reflectance convex lens 232, and then is converted into S light by the circular polarizer 238, the S light is reflected by the reflective polarizing film 236 back to the circular polarizer 238 and is modulated into right-handed circularly polarized light, the right-handed circularly polarized light passes through the low-transmittance high-reflectance mirror 222 and passes through the low-reflectance concave lens 224 and the low-reflectance convex lens 232 again after passing through the low-reflectance polarizing film 236 and the low-reflectance concave lens 224, and then is converted into P light by the circular polarizer 238, and the P light passes through the reflective polarizing film 236, the second achromatic quarter wave plate 234 and the optical functional sheet 239 and finally enters human eyes to form an enlarged virtual image.

In another embodiment, please refer to fig. 9, which is a cross-sectional view illustrating a display module according to another embodiment of the present application. As shown in fig. 9, it can be seen that the difference between the display module 300 of fig. 9 and the display module 200 of fig. 3 is: the side of the low anti-convex lens 232 to which the second achromatic quarter waveplate 234 is not attached faces the viewing side. Accordingly, the folded optical path of the display module 300 may be: the light emitted from the display 212 passes through the linear polarizer 214 to become P light, the P light passes through the first achromatic quarter wave plate 216 and is modulated into left-handed circularly polarized light, a part of the left-handed circularly polarized light passes through the anti-reflection film 50, the low-transmittance high-reflectance mirror 222, the low-reflectance concave lens 224 and the optical functional sheet 239, and then is converted into S light by the circular polarizer 238, the S light is reflected by the reflective polarizing film 236 back to the circular polarizer 238 and is modulated into right-handed circularly polarized light, the right-handed circularly polarized light passes through the low-transmittance high-reflectance mirror 222 and passes through the optical functional sheet 239 again after passing through the low-reflectance concave lens 224, and then is converted into P light by the circular polarizer 238, and the P light passes through the reflective polarizing film 236, the second achromatic quarter wave plate 234 and the low-reflectance convex lens 232 and finally enters human eyes to form an enlarged virtual image.

In another embodiment, when the convex lens assembly 230 of fig. 9 is replaced by a low inverse convex lens 232, a circular polarizer 238, a reflective polarizing film 236, a second achromatic quarter-wave plate 234 and an optical functional plate 239 sequentially attached, and a side of the low inverse convex lens 232 to which the circular polarizer 238 is not attached faces the viewing side, the folded optical path of the display module 300 may be: the light emitted from the display screen 212 passes through the linear polarizer 214 to become P light, the P light passes through the first achromatic quarter wave plate 216 and is modulated into left-handed circularly polarized light, a part of the left-handed circularly polarized light passes through the anti-reflection film 50, the low-transmittance high-reflectance mirror 222, the low-reflectance concave lens 224 and the optical function sheet 239, then is converted into S light by the second achromatic quarter wave plate 234, the S light is reflected by the reflective polarizing film 236 back to the second achromatic quarter wave plate 234 and is modulated into right-handed circularly polarized light, the right-handed circularly polarized light passes through the rear part of the low-transmittance high-reflectance mirror 222 of the low-reflectance concave lens 224 and passes through the optical function sheet 239 again, then is converted into P light by the second achromatic quarter wave plate 234, and the P light passes through the reflective polarizing film 236, the circular polarizing plate 238 and the low-reflectance convex lens 232 and finally enters human eyes to form an enlarged virtual image.

Therefore, the display module 200 and the display module 300 can reduce the transmission stray light through the low-transmittance high-reflection mirror; the display module 200 and the display module 300 can improve the definition of four corners of a picture and reduce distortion by arranging the low-transmittance high-reflection mirror 222, the low-reflection concave lens 224 and the low-reflection convex lens 232; the display module 200 and the display module 300 can improve the picture brightness and improve the definition to a certain extent by setting the circular polarizer 238 (because the transmittance of the circular polarizer 238 to natural light is greater than that of the linear polarizer, the circular polarizer 238 can improve the overall transmittance of normal light by about 8%); the display modules 200 and 300 can have the anti-reflection film 50 on one side of the first achromatic quarter wave plate 216 to increase light transmittance; the display module 200 and the display module 300 can reduce transmission stray light by arranging the low-transmittance high-reflectance mirror 222; the display module 200 and the display module 300 can improve the definition of the field of view by the arrangement of the low-reflection concave lens 224; the display module 200 and the display module 300 can increase the light transmittance by about 5-8% and reduce stray light images generated by reflection by arranging the optical function sheet 239 with the anti-glare, anti-reflection and anti-fingerprint functions; since the elements can be bonded by the high-transmittance OCA glue 90, the display module 200 and the display module 300 can reduce stray light generated by scattering, and improve the brightness and the definition of the picture.

Therefore, the display module 200 and the display module 300 of the present application can solve the problems of high stray light, dark picture and low definition of the display module adopting the Pancake folded light path scheme in the prior art.

In addition, the display module 200 and the display module 300 can improve the definition through the high-quality display screen 212; the display module 200 and the display module 300 can reduce the stray light of reflection type of each interface through the linear polarizer with high polarization efficiency; the

display modules

200 and 300 can control the polarization state of the folded light path more precisely through the first achromatic quarter-wave plate 216 with high retardation precision; the

display modules

200 and 300 can reduce unnecessary light loss through the P-light high-transmittance S-light high-reflectance reflective polarizing film 236, maximize the normal image brightness, and minimize the stray light image passing through the reflective polarizing film 236; the

display modules

200 and 300 can be made of low-density optical resin by using the materials of the low-transmittance high-reflectivity mirror 222, the low-reflectivity concave lens 224 and the low-reflectivity convex lens 232, so as to reduce the weight.

Therefore, the display module 200 and the display module 300 of the present application not only reduce the weight and the vertigo, improve the brightness and the definition of the picture, but also reduce the relative size of the maximum stray light image to 1% (5% in the general industry standard), so that the stray light image is not felt by human eyes completely, and the comfort level of the user experience is improved.

In one embodiment, referring to fig. 2 and 3, the display module 200 may further include a frame 240, and the low-transmittance high-reflectance mirror 222, the low-reflectance concave lens 224 and the convex lens assembly 230 are mounted in the frame 240; the mount 240 is assembled to the display screen assembly 210 according to the principle that the normal to the physical center of the active area of the display screen 212 coincides with the optical axis.

In an embodiment, referring to fig. 2 and 3, the display module 200 may further include a knob 250 and a snap ring 260; the knob 250 is sleeved outside the bracket 240, and the snap ring 260 is clamped with the bracket 240 and limits the movement of the knob 250 along the optical axis direction; the bracket 240 is provided with a plurality of inclined guide grooves 242, the plurality of inclined guide grooves 242 communicating the inside and the outside of the bracket 240; the low-transmittance high-reflectance mirror 222 is provided with a plurality of guide posts 60, and the plurality of guide posts 60 pass through the plurality of inclined guide grooves 242 (i.e. the guide posts 60 correspond to the inclined guide grooves 242 in a one-to-one manner), and are tightly matched with the knob 250; the low inverse concave lens 224 can be assembled in the bracket 240 through a dispensing, baking and curing process (i.e. after the UV thermosetting adhesive 80 is dispensed on the preset position of the bracket 240, the low inverse concave lens 224 is assembled on the bracket, then the UV thermosetting adhesive 80 is irradiated by ultraviolet light for primary curing, and then the bracket is sent to an oven for baking, so that the low inverse concave lens 224 is assembled on the preset position of the bracket 240); when the knob 250 is rotated in 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 high-reflectance mirror 222 and the low-reflectance concave lens 224. Accordingly, the diopter can be adjusted to fit different eyesight of different users by adjusting the relative position between the low-transmittance high-reflection mirror 222 and the low-reflection concave lens 224 using a simple bevel rotation structure without increasing the actual thickness of the display module 200.

In another embodiment, please refer to fig. 10, which is a schematic cross-sectional view of a display module according to another embodiment of the present application, wherein the difference between the display module 400 of fig. 10 and the display module 200 of fig. 3 is only: the low anti-concave lens 224 is provided with a plurality of guide posts 60, and the plurality of guide posts 60 pass through the plurality of inclined guide grooves 242 and are tightly matched with the knob 250; the low-transmittance high-reflectance mirror 222 can be assembled in the bracket 240 through a dispensing, baking and curing process (i.e., the low-transmittance high-reflectance mirror 222 is assembled on the bracket 240 after the UV thermosetting adhesive 80 is dispensed at a preset position, then the UV thermosetting adhesive 80 is irradiated by ultraviolet light for primary curing, and then the low-transmittance high-reflectance mirror 222 is baked in an oven to be assembled at the preset position of the bracket 240); when the knob 250 is rotated in 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 high-reflectance mirror 222 and the low-reflectance concave lens 224.

In another embodiment, please refer to fig. 11, which is a cross-sectional view illustrating a display module according to yet another embodiment of the present application, wherein the difference between the display module 500 of fig. 11 and the display module 400 of fig. 10 is: the side of the low anti-convex lens 232 of fig. 11 to which the second achromatic quarter waveplate 234 is not attached faces the viewing side; the side of the low anti-convex lens 232 of fig. 10 to which the second achromatic quarter waveplate 234 is not attached faces the display side.

Please refer to fig. 12, which is a flowchart illustrating a method of fabricating a display module according to an embodiment of the present disclosure. The method of manufacturing the display module of fig. 12 may be used to manufacture the display module 200 of fig. 2 to 4, and the method of manufacturing the display module of fig. 12 includes the following steps: antireflective treatment of the first achromatic quarter waveplate 216 so that one side of the first achromatic quarter waveplate 216 has the antireflective film 50 (step 310); sequentially attaching the display screen 212, the linear polarizer 214 and the first achromatic quarter wave plate 216 to form the display screen assembly 210, wherein a transmission axis of the linear polarizer 214 and a fast axis of the first achromatic quarter wave plate 216 form an included angle of 45 degrees, and the other side of the first achromatic quarter wave plate 216, which is not provided with the anti-reflection film 50, is attached to the linear polarizer 214 (step 320); sequentially bonding the low-inverse convex lens 232, the second achromatic quarter wave plate 234, the reflective polarizing film 236, the circular polarizer 238 and the optical function sheet 239, or sequentially bonding the low-inverse convex lens 232, the circular polarizer 238, the reflective polarizing film 236, the second achromatic quarter wave plate 234 and the optical function sheet 239 to form the convex lens assembly 230, wherein a transmission axis of the reflective polarizing film 236 and a fast axis of the second achromatic quarter wave plate 234 form an included angle of 45 degrees (step 330); assembling the low-transmittance high-reflectance mirror 222 in the holder 240 (step 340); assembling the bracket 240 with the low-transmission high-reflection mirror 222 on the display screen assembly 210 by an Active Alignment (AA) machine according to the principle that the normal of the physical center of the Active area of the display screen 212 coincides with the optical axis of the low-transmission high-reflection mirror 222 (step 350); and sequentially assembling the low-reflection concave lens 224 and the convex lens assembly 230 in the bracket 240 by an active alignment machine based on the common optical axis of the low-transmission high-reflection mirror 222, the low-reflection concave lens 224 and the convex lens assembly 230 and the parallel transmission axis of the linear polarizer 214 and the transmission axis of the reflective polarizing film 236 to form the display module 200 (step 360).

In one embodiment, step 310 includes: the anti-reflection film 50 is attached to one side of the first achromatic quarter-wave plate 216 through a high-transmittance OCA glue 90, wherein the high-transmittance OCA glue 90 may be, but is not limited to, an optical grade OCA glue with 99% transmittance. In another embodiment, step 310 includes: the anti-reflection film 50 is coated on one side of the first achromatic quarter waveplate 216 by vacuum coating.

In an embodiment, in step 320, the display screen 212, the linear polarizer 214, and the first achromatic quarter wave plate 216 are sequentially attached together by an OCA glue with 99% transmittance (i.e., the high transmittance OCA glue 90), and then placed in a high vacuum chamber with a temperature of 60 degrees celsius for defoaming for 1 hour to form the display screen assembly 210. In addition, before the first achromatic quarter wave plate 216 is attached to the online polarizer 214, the direction of the transmission axis of the linear polarizer 214 and the direction of the fast axis of the first achromatic quarter wave plate 216 can be respectively measured by a special machine, and then the other side of the first achromatic quarter wave plate 216, which is not provided with the anti-reflection film 50, is accurately attached to the online polarizer 214 according to the fact that the transmission axis of the linear polarizer 214 and the fast axis of the first achromatic quarter wave plate 216 form an included angle of 45 degrees.

In an embodiment, in step 330, the low-inverse convex lens 232, the second achromatic quarter wave plate 234, the reflective polarizing film 236, the circular polarizer 238 and the optical functional film optical functional sheet 239 are sequentially bonded together by an OCA glue with 99% transmittance, and then placed in a high vacuum chamber at a temperature of 60 ℃ for defoaming for 1 hour to form the convex lens assembly 230; in addition, before the reflective polarizer 236 is attached to the second achromatic quarter wave plate 234, the fast axis direction of the second achromatic quarter wave plate 234 and the transmission axis direction of the reflective polarizer 236 can be measured by a special machine, and then the reflective polarizer 236 is accurately attached to the second achromatic quarter wave plate 234 according to the fact that the transmission axis of the reflective polarizer 236 and the fast axis of the second achromatic quarter wave plate 234 form an included angle of 45 degrees. In another embodiment, in step 330, the low anti-convex lens 232, the circular polarizer 238, the reflective polarizer 236, the second achromatic quarter wave plate 234 and the optical function plate 239 are sequentially bonded together by an OCA glue with 99% transmittance, and then placed in a high vacuum chamber at 60 degrees centigrade for defoaming for 1 hour to form the convex lens assembly 230; in addition, before the second achromatic quarter wave plate 234 is attached to the reflective polarizing film 236, the fast axis direction of the second achromatic quarter wave plate 234 and the transmission axis direction of the reflective polarizing film 236 can be respectively measured by a special machine, and then the second achromatic quarter wave plate 234 is accurately attached to the reflective polarizing film 236 according to the fact that the transmission axis of the reflective polarizing film 236 and the fast axis of the second achromatic quarter wave plate 234 form an included angle of 45 degrees.

In one embodiment, referring to fig. 3 and 9, the low-transmittance high-reflectance mirror 222 is provided with a plurality of guide posts 60; the bracket 240 is provided with a plurality of inclined guide grooves 242, the plurality of inclined guide grooves 242 communicating the inside and the outside of the bracket 240; thus, step 340 may include: a plurality of guide posts 60 pass through a plurality of angled guide slots 242 to fit the low transmissivity, high reflectivity mirror 222 within the housing 240. In addition, in this embodiment, the method of manufacturing the display module after step 360 may further include: sleeving the knob 250 on the outer side of the bracket 240, so that the plurality of guide posts 60 are tightly matched with the knob 250; and a snap ring 260 is assembled to snap the holder 240 and restrict the movement of the knob 250 in the optical axis direction. Therefore, when the knob 250 is rotated in the circumferential direction, the plurality of guide posts 60 are moved along the plurality of inclined guide slots 242 to adjust the relative position between the low-transmittance high-reflectance mirror 222 and the low-reflectance concave lens 224.

In another embodiment, referring to fig. 10 and 11, step 340 may include: the low transmittance high reflectance mirror 222 is cured by dispensing, baking and curing to mount the low transmittance high reflectance mirror 222 in the holder 240. In more detail, the low transmittance and high reflectance mirror 222 may be assembled on the bracket 240 after the UV thermosetting adhesive 80 is dispensed on the predetermined position of the bracket 240, and then the UV thermosetting adhesive 80 is irradiated by ultraviolet light for primary curing, and then the assembly is sent to an oven for baking, so that the low transmittance and high reflectance mirror 222 is assembled on the predetermined position of the bracket 240, wherein the baking temperature may be, but is not limited to, 80 degrees celsius, and the baking time may be, but is not limited to, 2 hours.

In one embodiment, referring to fig. 12, assembling the bracket 240 with the low-transmittance high-reflectance mirror 222 to the display panel assembly 210 in step 350 may include: the bracket 240 with the low-transmittance high-reflectance mirror 222 mounted thereon is assembled to the display screen assembly 210 in an adhesive manner. The pasting method can be, but is not limited to, the dispensing baking curing treatment.

In one embodiment, referring to fig. 3 and 9, step 360 may include: based on the common optical axis (i.e., the common optical axis C) of the low-transmittance high-reflectance mirror 222, the low-reflectance concave lens 224 and the convex lens assembly 230, and the parallel light transmission axis of the linear polarizer 214 and the light transmission axis of the reflective polarizer film 236, the low-reflectance concave lens 224 and the convex lens assembly 230 are sequentially dispensed, baked and cured by an active alignment machine, so that the low-reflectance concave lens 224 and the convex lens assembly 230 are sequentially assembled in the bracket 240. In more detail, after the UV thermosetting adhesive 80 is dispensed on the preset position of the bracket 240, the low-transmittance high-reflectance mirror 222 is assembled thereon, and then the UV thermosetting adhesive 80 is irradiated by ultraviolet light to perform primary curing, and then the UV thermosetting adhesive is sent to an oven to be baked (the baking temperature can be, but is not limited to, 80 ℃, and the baking time can be, but is not limited to, 2 hours), so as to assemble the low-transmittance high-reflectance mirror 222 on the preset position of the bracket 240; then, the convex lens assembly 230 is assembled on the bracket 240 after the UV thermosetting adhesive 80 is dispensed at the predetermined position, and then the UV thermosetting adhesive 80 is irradiated by ultraviolet light to perform a primary curing, and then the assembly is sent to an oven to be baked (the baking temperature may be, but is not limited to, 80 degrees celsius, and the baking time may be, but is not limited to, 2 hours), so as to assemble the convex lens assembly 230 on the predetermined position of the bracket 240.

In one embodiment, referring to fig. 10 and 11, the low anti-concave lens 224 is provided with a plurality of guiding pillars 60, the frame 240 is provided with a plurality of inclined guiding slots 242, and the plurality of inclined guiding slots 242 connect the inside and the outside of the frame 240; thus, step 360 may include: a plurality of guide posts 60 pass through a plurality of angled guide slots 242 to fit the low back concave lens 224 into the carrier 240; and based on the common optical axis (i.e., the common optical axis C) of the low-transmittance high-reflectance mirror 222, the low-reflectance concave lens 224 and the convex lens assembly 230, and the light transmission axis of the linear polarizer 214 and the light transmission axis of the reflective polarizer 236 being parallel, assembling the convex lens assembly 230 in the bracket 240 by actively aligning the alignment stage and performing dispensing, baking and curing treatment on the convex lens assembly 230 (i.e., assembling the convex lens assembly 230 on the bracket 240 after the UV thermosetting adhesive 80 is dispensed at the preset position of the bracket 240, then irradiating the UV thermosetting adhesive 80 with ultraviolet light for primary curing, and then baking the assembly in an oven 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). In addition, in this embodiment, the method of manufacturing the display module after step 360 may further include: sleeving the knob 250 on the outer side of the bracket 240, so that the plurality of guide posts 60 are tightly matched with the knob 250; and a snap ring 260 is assembled to snap the holder 240 and restrict the movement of the knob 250 in the optical axis direction. Therefore, when the knob 250 is rotated in the circumferential direction, the plurality of guide posts 60 are moved along the plurality of inclined guide slots 242 to adjust the relative position between the low-transmittance high-reflectance mirror 222 and the low-reflectance concave lens 224.

Please refer to fig. 13, which is a flowchart illustrating a method of fabricating a display module according to another embodiment of the present application. The method for manufacturing the display module may further include, in addition to the steps 310 to 360: the display module 200 is subjected to a functional test procedure (step 370). Wherein the functional test program comprises: black spots, optical Modulation Transfer Function (MTF) performance, luminance, chrominance and power were tested. When the test result of the display module 200 meets the shipment standard, it indicates that the display module 200 is manufactured completely.

It should be noted that, if there is no causal relationship between the above steps, the present application does not limit the execution sequence.

In summary, in the embodiment of the present application, the display module can improve the brightness of the image and improve the definition to a certain extent by the arrangement of the circular polarizer; the display module can be provided with an antireflection film on one side of the first achromatic quarter-wave plate, so that the light transmittance is increased; the display module can reduce transmission stray light by arranging the low-transmittance high-reflectivity mirror; the display module can improve the definition of a view field through the arrangement of the low-reflection concave lens; the display module can improve the definition of four corners of a picture and reduce distortion through the arrangement of the low-transmittance high-reflection mirror, the low-reflection concave lens and the low-reflection convex lens; the display module can reduce stray light images generated by reflection through the arrangement of the optical functional sheet. Therefore, the display module of the application can improve the comfort level of user experience.

Although the above-described elements are included in the drawings of the present application, it is not excluded that more additional elements may be used to achieve better technical results without departing from the spirit of the present invention.

While the utility model has been described using the above embodiments, it should be noted that these descriptions are not intended to limit the utility model. On the contrary, the utility model covers modifications and similar arrangements that are obvious to a person skilled in the art. The scope of the claims is, therefore, to be construed in the broadest manner to include all such obvious modifications and similar arrangements.

Claims

1. A display module, comprising, in order from a display side to a viewing side: the display screen comprises 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 includes: the display screen, the linear polarizer and the first achromatic quarter-wave plate are sequentially attached from the display side to the viewing side, an antireflection film is arranged on one side of the first achromatic quarter-wave plate, and the other side of the first achromatic quarter-wave plate is attached to the linear polarizer;

the optical lens group comprises, in order from the display side to the viewing side: a low-transmittance high-reflection lens and a low-reflection concave lens;

the convex lens assembly includes: the low-reflection convex lens, the second achromatic quarter-wave plate, the reflective polarizing film, the circular polarizer and the optical function sheet are sequentially attached, or the low-reflection convex lens, the circular polarizer, the reflective polarizing film, the circular polarizer and the optical function sheet are sequentially attached;

wherein, the transmission axis of linear polarizer and the fast axis of first achromatic quarter-wave plate are 45 degrees contained angles, the transmission axis of reflection polarizing film and the fast axis of second achromatic quarter-wave plate are 45 degrees contained angles, the transmission axis of linear polarizer and the transmission axis of reflection polarizing film are parallel.

2. The display module of claim 1, wherein the display screen is an LCD screen or an OLED screen.

3. The display module of claim 1, wherein the thickness of the linear polarizer is less than or equal to 0.08 mm, and the polarization efficiency of the linear polarizer is greater than or equal to 99.9%.

4. The display module according to claim 1, wherein the low-transmittance high-reflectance mirror has a reflectivity of 65%, the low-transmittance high-reflectance mirror has a transmittance of 35%, and the low-transmittance high-reflectance mirror is a high-refractive-index optical resin lens.

5. The display module of claim 1, wherein the low inverse concave lens and the low inverse convex lens are aspheric, high refractive index optical resin lenses, and the refractive index of the low inverse concave lens and the low inverse convex lens is greater than or equal to 1.9.

6. The display module of claim 1, further comprising a frame in which the low-transmittance high-reflectance mirror, the low-reflectance concave lens, and the convex lens assembly are assembled; and according to the principle that the normal line of the physical center of the effective area of the display screen is coincident with the optical axis, assembling the support on the display screen assembly.

7. The display module of claim 6, further comprising a knob and a snap ring; the knob is sleeved on the outer side of the bracket, and the clamping ring is clamped with the bracket and limits the movement of the knob along the direction of the optical axis; the bracket is provided with a plurality of inclined guide grooves which are communicated with the inside and the outside of the bracket; the low-transmittance high-reflection mirror or the low-reflection concave lens is provided with a plurality of guide columns, and the guide columns penetrate through the inclined guide grooves and are tightly matched with the knob; when the knob rotates along the circumferential direction, the guide posts are driven to move along the inclined guide grooves so as to adjust the relative position between the low-transmittance high-reflection mirror and the low-reflection concave lens.

8. The display module according to claim 1, wherein the reflective polarizing film has a transmittance of 90% or more for P light, a reflectance of 99% or more for S light, and a transmittance of 1% or less for S light.

9. The display module according to claim 1, wherein the display screen, the linear polarizer, the first achromatic quarter-wave plate, and the antireflection film are sequentially bonded together through an OCA adhesive with 99% light transmittance.

10. The display module of claim 1, wherein the display screen, the linear polarizer and the first achromatic quarter wave plate are sequentially bonded together by an OCA (optically clear adhesive) with 99% transmittance, and the anti-reflection film is plated on the first achromatic quarter wave plate.

11. The display module according to claim 1, wherein the low inverse convex lens, the second achromatic quarter wave plate, the reflective polarizing film, the circular polarizer and the optical functional sheet are sequentially attached together by using an OCA adhesive having a transmittance of 99%, or the low inverse convex lens, the circular polarizer, the reflective polarizing film, the second achromatic quarter wave plate and the optical functional sheet are sequentially attached together by using an OCA adhesive having a transmittance of 99%.

12. The display module of claim 1, wherein a side of the low anti-convex lens to which the second achromatic quarter wave plate or the circular polarizer is not attached faces the display side or the viewing side.