CN111999935B

CN111999935B - Display module and display device

Info

Publication number: CN111999935B
Application number: CN202010877573.8A
Authority: CN
Inventors: 林伟
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2022-07-12
Anticipated expiration: 2040-08-27
Also published as: CN111999935A

Abstract

The invention discloses a display module and a display device, which relate to the technical field of display, and the display module comprises: the backlight module is positioned on one side of the display panel, which is far away from the light-emitting surface of the display module; the light sensing element is positioned on one side of the backlight module, which is far away from the display panel; the backlight module comprises a light guide plate, a reflecting layer and an iron frame, wherein the iron frame comprises a supporting part and a first through hole; the first through hole penetrates through the iron frame along the direction perpendicular to the light emitting surface, the iron frame is located on one side, away from the display panel, of the light guide plate, the reflection layer is located between the light guide plate and the iron frame, the supporting portion is in contact with the reflection layer, and the orthographic projection of the supporting portion on the light emitting surface covers the orthographic projection of the first through hole on the light emitting surface. Because the supporting part contacts with the reflecting layer, the light guide plate can be tightly attached to the reflecting layer, and the film is prevented from slightly deforming due to electrostatic adsorption or finger pressing, so that an air gap between the film in the backlight module is eliminated, the generation of Newton rings is effectively inhibited, and the accuracy of optical fingerprint identification is improved.

Description

Display module and display device

Technical Field

The invention relates to the technical field of display, in particular to a display module and a display device.

Background

With the development of display technology and full-screen technology, display panels with fingerprint recognition function have gradually spread all over the corners of our lives. Since fingerprints are the invariant features that human bodies are native and uniquely distinguishable from others, the in-screen fingerprint identification technology with high screen occupation ratio is widely applied to display screens of electronic devices such as mobile phones and tablet computers to realize identity verification.

At present, fingerprint identification technique mainly discerns the fingerprint through the intensity difference that detects fingerprint valley ridge reflection light, and the reflection light that carries fingerprint information pierces through display panel and backlight unit in proper order and finally is received by fingerprint sensor. However, the film material of each film layer in the backlight module is not flat, and the light guide plate is slightly deformed by pressing with fingers, so that an uneven air layer is formed between the light guide plate and the reflective layer, and a newton ring is generated. The generation of Newton rings can cause interference to the fingerprint sensor, and the accuracy of fingerprint identification is reduced.

Disclosure of Invention

The invention provides a display module and a display device, which can effectively inhibit Newton rings and improve the accuracy of optical fingerprint identification.

In a first aspect, the present application provides a display module, including:

a display panel;

the backlight module is positioned on one side of the display panel, which is far away from the light-emitting surface of the display module;

the light sensing element is positioned on one side of the backlight module, which is far away from the display panel;

the backlight module comprises a light guide plate, a reflecting layer and an iron frame, wherein the iron frame comprises a supporting part and a first through hole; the perpendicular to is followed the direction on the play plain noodles of display module assembly, first through-hole runs through the chase, the chase is located the light guide plate is kept away from one side of display panel, the reflection stratum is located the light guide plate with between the chase, the supporting part with the reflection stratum contacts, just the supporting part is in the orthographic projection on play plain noodles covers first through-hole is in the orthographic projection on play plain noodles.

In a second aspect, the present application further provides a display device, including the display module of the first aspect.

Compared with the prior art, the display module and the display device provided by the invention at least realize the following beneficial effects:

among display module assembly and display device that this application provided, backlight unit includes light guide plate, reflection stratum and chase, and wherein, the chase includes supporting part and first through-hole. Because the supporting part contacts with the reflecting layer, therefore can make light guide plate and reflecting layer closely laminate, not only avoid reflecting layer and light guide plate to lead to warp because of electrostatic adsorption, also can prevent to touch the main part, the light guide plate takes place slight deformation and uneven air bed appears like finger pressing back, consequently eliminated the air gap between the membrane material among the backlight unit, and then effectively restrain Newton's ring's production, improved optics fingerprint identification's accuracy.

Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

FIG. 1 is a diagram illustrating prior art underscreen fingerprint identification;

fig. 2 is a schematic structural diagram of a display module according to an embodiment of the present disclosure;

FIG. 3 is an AA' cross-sectional view of the display module of FIG. 2;

FIG. 4 is a schematic diagram of the Newton's ring provided in the embodiment of FIG. 2;

FIG. 5 is a cross-sectional view of another AA' of the display module of FIG. 2;

FIG. 6 is a schematic view of an arrangement of the bump structures of FIG. 5;

FIG. 7 is a cross-sectional view of another AA' of the display module of FIG. 2;

FIG. 8 is an enlarged view of a portion of the sawtooth structure of the support portion of FIG. 7;

FIG. 9 is a cross-sectional view of another AA' of the display module of FIG. 2;

FIG. 10 is a cross-sectional view of another AA' of the display module of FIG. 2;

FIG. 11 is an enlarged view of a portion of the chase of FIG. 10;

FIG. 12 is a cross-sectional view of another AA' of the display module of FIG. 2;

FIG. 13 is an enlarged view of a portion of the chase of FIG. 12;

fig. 14 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.

Detailed Description

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Fig. 1 is a schematic diagram of a prior art fingerprint recognition under a screen. Specifically, as shown in fig. 1, when the finger presses the display screen, the fingerprint sensor 30 ' detects or recognizes the infrared light reflected to the fingerprint sensor 30 ' by the finger, and the infrared light carrying the fingerprint information can reach the fingerprint sensor 30 ' only through the display panel 10 ' and the backlight module 20 '. Due to the limitation of the manufacturing process, the film materials of each film layer in the backlight module 20' are not flat, and the adjacent two film materials are warped due to electrostatic adsorption to form an uneven air gap; moreover, the light guide plate 201 ' in the backlight module 20' is slightly deformed by pressing with a finger, that is, the light guide plate 201 ' protrudes downward, so that an uneven air gap is formed between the light guide plate 201 ' and the reflective layer 202 '. The two reasons are that infrared light reflected by the finger interferes when passing through the joint of the light guide plate 201 'and the reflective layer 202', and a microscopic newton ring is generated. The generation of newton's rings interferes with the fingerprint sensor 30', greatly reducing the accuracy of fingerprint recognition.

Fig. 2 is a schematic structural diagram of a display module according to an embodiment of the present disclosure, and fig. 3 is an AA' cross-sectional view of the display module according to the embodiment of fig. 2. Referring to fig. 2 and fig. 3, an embodiment of the present application provides a display module 100, including:

a display panel 10;

the backlight module 20 is located on one side of the display panel 10 away from the light-emitting surface of the display module 100;

the light sensing element 30 is positioned on one side of the backlight module 20 far away from the display panel 10;

the backlight module 20 includes a light guide plate 201, a reflective layer 202 and an iron frame 203, wherein the iron frame 203 includes a supporting portion 203a and a first through hole M1; along a direction perpendicular to the light exit surface of the display module 100, the first through hole M1 penetrates through the bezel 203, the bezel 203 is located on a side of the light guide plate 201 away from the display panel 10, the reflective layer 202 is located between the light guide plate 201 and the bezel 203, the supporting portion 203a contacts with the reflective layer 202, and an orthographic projection of the supporting portion 203a on the light exit surface covers an orthographic projection of the first through hole M1 on the light exit surface.

In this embodiment, optionally, the light sensing element 30 is a fingerprint sensor, and the infrared LED can be used as a light source for fingerprint detection and identification. The display panel 10 includes a display area AA and a non-display area NA at least partially surrounding the display area AA, wherein the display area AA is divided into a fingerprint identification area Z and a non-fingerprint identification area FZ, and areas of the display area AA excluding the fingerprint identification area Z are the non-fingerprint identification area FZ, and the fingerprint identification function can be realized by placing a finger in the fingerprint identification area Z of the display panel 10. Of course, fig. 2 is only used for illustrating one position relationship of the fingerprint identification area Z in the display area AA, in some other embodiments of the present application, the fingerprint identification area Z may also be located at any other position of the display area AA, and the size of the fingerprint identification area Z is not limited in fig. 2, and in some other embodiments of the present application, the fingerprint identification area Z may also coincide with the display area AA.

Besides the light guide plate 201 and the reflective layer 202, the backlight module 20 may further include a plurality of optical film materials such as a diffuser sheet and a brightness enhancement film, and fig. 3 in this embodiment only shows a part of the film layer structure of the backlight module 20, and does not represent actual film layers and dimensions.

FIG. 4 is a schematic diagram of the embodiment of FIG. 2 showing a Newton's ring. As shown in fig. 4, a newton ring, also called "newton ring," is a typical constant thickness interference phenomenon, when the light guide plate 201 is warped due to electrostatic adsorption or pressing by a touch subject, a wedge-shaped air gap is formed around a contact point between the light guide plate and the middle of the reflective layer 202, and when infrared light reflected by the touch subject is vertically incident, a path difference exists between light reflected from the upper surface of the air gap and light reflected from the lower surface of the air gap, and interference occurs, so that interference fringes are formed by superimposing on the lower surface of the reflective layer 202, and concentric rings with alternating light and dark, that is, newton rings are generated. In this embodiment, because the supporting portion 203a is added in the bezel 203, the light guide plate 201 and the reflective layer 202 are tightly attached by the extrusion of the supporting portion 203a, and an air gap at the joint of the light guide plate and the reflective layer is eliminated, so that the light reflected by the finger does not interfere with each other, the newton ring is effectively improved, and the accuracy of optical fingerprint identification is greatly improved.

In addition, along a direction perpendicular to the light exit surface of the display module 100, an orthogonal projection of the supporting portion 203a on the light exit surface covers an orthogonal projection of the first through hole M1 on the light exit surface. It can be understood that the fingerprint sensor is located on a side of the backlight module 20 away from the display panel 10, and in order to enable the light reflected by the finger to be received by the fingerprint sensor, the bezel 203 is further provided with a first through hole M1. However, the supporting force is reduced after the iron frame 203 is dug, and in order to avoid the membrane material from sinking, the supporting part 203a is arranged at the corresponding position of the first through hole M1, so as to provide rigid support for the dug part and avoid the membrane material from deforming; further, since air gaps are formed between the film layers when the film materials are collapsed, the provision of the support portions 203a can ensure no gap between the film materials and further suppress the occurrence of newton rings.

It should be noted that, as a light source for fingerprint detection and identification, infrared light is reflected by other parts in the touch main body or the display module 100, and not only enters the fingerprint identification area Z, but also may enter the non-fingerprint identification area FZ, but because infrared light is invisible light and cannot be identified by human eyes, the supporting portion 203a in this embodiment may be only disposed in the fingerprint identification area Z, so as to effectively improve the fingerprint identification accuracy on the basis of not increasing the process difficulty.

Optionally, with continued reference to fig. 3, the chase 203 further includes a boss structure 203 b;

along a direction perpendicular to the light exit surface of the display module 100, the protruding structure 203b protrudes toward a side close to the display panel 10, and an orthogonal projection of the first through hole M1 on the light exit surface is located within an orthogonal projection of the protruding structure 203b on the light exit surface.

In this embodiment, the bezel 203 may further include a convex structure 203b, and the convex structure 203b protrudes toward a side close to the display panel 10, so that each film in the backlight module 20 can be squeezed, and an air gap between the light guide plate 201 and the reflective layer 202 is eliminated within the range of the fingerprint identification region Z, thereby destroying the formation condition of the newton ring and ensuring the identification accuracy of the fingerprint sensor.

Optionally, the protruding structure 203b is formed by stamping through a die, and a height H of the protruding structure 203b along a direction perpendicular to the light exit surface of the display module 100 may be 0.05-0.1 mm, where the height of the protruding structure 203b refers to a protruding height facing the light exit surface of the display module during stamping. It should be understood that if the height H of the protruding structure 203b is too small, the pressing force for eliminating the air gap between the films is not enough, and the light guide plate 201 and the reflective layer 202 cannot be tightly attached; if the height H of the protrusion structure 203b is too large, the thickness of the display module 100 will be increased, which is not favorable for meeting the requirement of thin display module. Therefore, in the embodiment, the height H of the convex structure 203b is set to be 0.05-0.1 mm, which not only ensures that the air between the light guide plate 201 and the reflective layer 202 is completely removed by extrusion, but also meets the requirement of lightness and thinness of the display product.

The boss structure 203b formed by stamping may be square, circular or other shapes as long as it can form a pressing force for tightly adhering the light guide plate 201 and the reflective layer 202, and this embodiment is not limited thereto.

Alternatively, as shown in fig. 3, the supporting portion 203a includes a transparent supporting material T, and the transparent supporting material T is filled in the first through hole M1.

It can be understood that, after the first through hole M1 is punched in the boss structure 203b, the support of the frame 203 to the film material is weakened, so that the support portion 203a is disposed in the first through hole M1 in this embodiment, which can enhance the support force at the position of the first through hole M1, and prevent the air gap from being generated due to the sinking of the film material at the position corresponding to the first through hole M1.

In addition, the supporting portion 203a may be a transparent supporting material T. Since in the light sensing fingerprint identification technology, the greater the amount of light received by the fingerprint sensor (i.e., the light sensing element 30), the higher the fingerprint identification accuracy, and the less the amount of light received by the light sensing element 30, the lower the fingerprint identification accuracy. Adopt transparent material preparation supporting part 203a in this embodiment, can avoid causing the sheltering from to the light that the finger reflects back to improve fingerprint sensor's the light incident amount, and promote fingerprint identification's accuracy.

FIG. 5 is a cross-sectional view of another AA' of the display module of FIG. 2. Optionally, referring to fig. 5, a side surface of the light guide plate 201 close to the reflective layer 202 includes a plurality of bump structures 2011.

In this embodiment, the display panel 10 may be a liquid crystal display panel 10, which includes two substrates disposed oppositely and a liquid crystal filled between the two substrates. The main function of the light guide plate 201 is to guide the direction of light from the backlight source, i.e. to convert incident light into vertical outgoing light. Since the plurality of bump structures 2011 are disposed on the surface of the light guide plate 201 on the side close to the reflective layer 202, when light enters the bump structures 2011 on the bottom of the light guide plate 201, the light is scattered in various directions, so that the total reflection condition in the light guide plate 201 is destroyed, and the light exits from the surface of the light guide plate 201 on the side far from the reflective layer 202. That is, the plurality of bump structures 2011 at the bottom of the light guide plate 201 can convert a point light source of an LED or a line light source of a CCFL (Cold Cathode Fluorescent Lamp) into a surface light source required by the display panel 10.

It can be seen that the bump structure 2011 disposed at the bottom of the light guide plate 201 is beneficial to improving the light guiding effect of the light guide plate 201, and further improving the brightness uniformity of the display panel 10.

For example, the bump structure 2011 in this embodiment may be manufactured by a screen printing method, a mask etching method, or a transfer printing method. Among them, the screen printing method is to print ink on the light guide plate 201 by a screen method and then to cure the ink by an infrared or ultraviolet method, and the printed ink usually contains SiO₂、TiO₂Or BaS. The mask etching method forms a plurality of bump structures 2011 by coating a bump pattern material, exposing and developing a photoresist, and then etching the bump pattern material. The transfer printing method is to make the designed bump pattern into a mold and transfer the pattern to the light guide plate 201 by the mold when the light guide plate 201 is injection molded, and this method omits the printing step and is favorable to saving the manufacturing cost.

Fig. 6 is a schematic view of an arrangement of the bump structures in fig. 5. Optionally, referring to fig. 5 and fig. 6, the bump structures 2011 include a first bump structure 2011a and a second bump structure 2011b, the bezel 203 includes a first sub-area S1 and a second sub-area S2, and the bump structure 203a is located in the first sub-area S1;

in a direction perpendicular to the light exit surface of the display module 100, the orthographic projection of the first bump structure 2011a on the light exit surface covers the orthographic projection of the first sub-area S1 on the light exit surface, and the orthographic projection of the second bump structure 2011b on the light exit surface covers the orthographic projection of the second sub-area S2 on the light exit surface; the arrangement density of the first bump structures 2011a is less than that of the second bump structures 2011 b.

Specifically, the bump structures 2011 at the bottom of the light guide plate 201 can change the propagation direction of light to transmit out of the light guide plate 201, and the density of the bump structures 2011 has close relation with the angle, the brightness and the brightness uniformity of the emergent light. Since the boss structure 203b is disposed in the first sub-area S1 of the bezel 203, the corresponding film layers are more closely attached to each other and the brightness of the display panel 10 is greater than that of the second sub-area S2. In this embodiment, the arrangement density of the second bump structures 2011b in the second sub-area is increased, so that the brightness of the display panel 10 corresponding to the second sub-area can be properly enhanced, otherwise, the arrangement density of the first bump structures 2011a in the first sub-area is reduced, so that the brightness of the display panel 10 corresponding to the first sub-area S1 can be properly weakened, the brightness uniformity of the display panel 10 is effectively improved, the display effect of the display panel 10 is ensured, and the improvement of the user experience is facilitated.

In addition to the density and density of the bump structures 2011, the size and shape of the bump structures also affect the intensity and scattering angle of the emitted light. Generally, the bump structures 2011 may have a circular, oval, square, or hexagonal shape, each bump structure 2011 generally has a size of 0.2-1 mm, and a pitch between adjacent bump structures 2011 is generally greater than 0.1 mm.

Fig. 7 is an AA' cross-sectional view of the display module according to the embodiment of fig. 2, and fig. 8 is a partially enlarged view of the zigzag structure of the supporting portion in fig. 7. Optionally, referring to fig. 7 and 8, a side surface of the supporting portion 203a close to the light emitting surface of the display module 100 includes a plurality of saw tooth structures V.

In the present embodiment, a plurality of saw-tooth structures V are cut on the surface of the supporting portion 203a on the side contacting the reflective layer 202, and these saw-teeth are similar to the prism microstructure. As shown in fig. 8, the refraction and reflection of the incident light on the prism microstructure mainly include total internal reflection (incident light a), refraction of the light out of the display module 100 (incident light b), and entrance of a small portion of the emergent light into the adjacent sawtooth structure V (incident light c).

Specifically, when the incident light satisfies the total reflection condition, the incident light is totally reflected, about 50% of the light can be recycled, and the recycled light and the directly refracted light can be collected in a range of about 70 ° of the normal viewing angle, so that the brightness of the display panel 10 at the normal viewing angle is effectively improved. And a portion of the light entering the adjacent saw tooth can be recycled. Obviously, after the sawtooth structure V is disposed on the side of the reflective layer 202 close to the light-emitting surface of the display module 100, the incident light can be converged, and the front brightness of the display panel 10 and the utilization rate of the backlight source are improved.

Optionally, each of the sawtooth structures V includes a first surface 01 and a second surface 02 facing a light emitting surface side of the display module 100, and the first surface 01 intersects the second surface 02.

Referring to fig. 8, each of the saw-tooth structures V includes a first surface 01 and a second surface 02 facing the light emitting surface of the display module 100, and an included angle α is formed between the first surface 01 and the second surface 02. Optionally, the included angle α is 90 °, at this time, only light rays with an exit angle within ± 35 ° of the normal direction can be refracted and guided out, light rays beyond the angle range can be reflected back to the prism microstructure for recycling, and finally exit within ± 35 ° range, so that incident large-view angle divergent light is collected in a smaller range to exit, and the display brightness of the front view angle is further increased.

Of course, the angle, the surface structure and the distance of the sawtooth structure V in the supporting portion 203a all have an influence on the uniformity of the outgoing light and the angle of the outgoing light, the included angle between the first surface 01 and the second surface 02 should be set according to actual requirements, and the included angle α may also be 95 °, 100 °, 105 ° or 110 °, which is not limited in the present application.

Optionally, referring to fig. 7, in a direction perpendicular to the light-emitting surface of the display module 100, within the first sub-area, a surface of the bezel 203 facing the light-emitting surface and the vertexes of the sawtooth structures V are located on the same plane.

Specifically, in the first subregion, the surface of the bezel 203 facing the light exit surface and the apexes of the saw-tooth structures V are located on the same plane, that is, the thickness h1 of the supporting portion 203a is substantially the same as the thickness h2 of the bezel 203. In this embodiment, the thickness h2 of the bezel 203 may be 0.1mm, and the thickness of the supporting portion 203a may be 99 μm ± 1 μm. It can be understood that, along the direction perpendicular to the light-emitting surface of the display module 100, if the vertex of the sawtooth structure V exceeds the surface of the bezel 203 facing the light-emitting surface, the thickness of the display module 100 will be increased, which is not favorable for meeting the requirement of the display device for thinning; on the contrary, if the thickness h1 of the supporting portion 203a is too small, that is, the vertex of the sawtooth structure V is lower than the surface of the bezel 203 facing the light exit surface, the supporting portion 203a cannot contact the reflective layer 202, and cannot provide enough pressing force to eliminate the air gap, and thus cannot suppress the generation of newton rings. Therefore, in the present embodiment, the vertex of the sawtooth structure V of the supporting portion 203a is flush with the surface of the bezel 203 facing the light-emitting surface, so that the newton ring problem is solved while providing enough squeezing strength, and the accuracy of fingerprint identification is ensured.

Optionally, the reflective layer 202 is an infrared-transmissive light reflecting sheet.

Specifically, referring to fig. 3, 5 and 7, since the reflective layer 202 covers the first through hole M1 of the bezel 203, the infrared light reflected by the touch subject must pass through the reflective layer 202 and the first through hole M1 in sequence before being received by the light sensing element 30. In order to transmit Infrared light, the reflective layer 202 may be an Infrared transparent reflective sheet, such as NITS-R (Near Infrared Transmission System Reflector), the Near Infrared Transmission System reflective sheet is made of polycarbonate, and the transmittance of Infrared light is higher than 80%. Compared with a common reflector which only transmits visible light, the infrared light transmitting reflector can significantly improve the transmission efficiency of infrared light and improve the recognition ability of the light sensing element 30 under the reflective layer 202.

FIG. 9 is a cross-sectional view of another AA' of the display module of FIG. 2. Alternatively, as shown in fig. 9, the supporting portion 203a is located on a side of the bezel 203 close to the display panel 10 along a direction perpendicular to the light exit surface of the display module 100, and the supporting portion 203a includes a transparent supporting material T.

In this embodiment, the supporting portion 203a is located between the bezel 203 and the reflective layer 202 along a direction perpendicular to the light-emitting surface of the display module 100, and the orthographic projection of the supporting portion 203a on the light-emitting surface at least covers the fingerprint identification area Z. The supporting part 203a is additionally arranged in the range of the fingerprint identification area Z, so that the extrusion force for eliminating the air gap between the membrane layers can be generated, the forming condition of the Newton ring is further destroyed, and the interference of the Newton ring on the fingerprint sensor is avoided; on the other hand, the supporting portion 203a may also provide a rigid support for the position corresponding to the first through hole M1, so as to avoid the film material from sinking, and further ensure that the air between the film layers is completely squeezed and eliminated.

Alternatively, the support portion 203a is formed using an injection molding process.

The injection molding process is a method for producing and molding industrial products, and is a method for injecting heated and melted materials into a mold cavity from high pressure, and obtaining a molded product after cooling and solidification. In this embodiment, the supporting portion 203a can be realized by an injection molding process, so that the product can be formed and processed in various shapes and accurate in size, the forming and processing period is short, and the production efficiency is improved. Further, in order to simplify the manufacturing process, the supporting portion 203a may be formed by injection molding, and then the supporting portion 203a may be fixed on the iron frame 203 by hot pressing or double-sided tape bonding.

With continued reference to fig. 9, the bezel 203 further includes a second through hole M2 in addition to the first through hole M1. Along the direction that is parallel to the light-emitting surface of the display module 100, two sides of the first through hole M1 are respectively provided with a second through hole M2, the supporting portion 203a includes two first sub-portions D1, and when the supporting portion 203a is assembled, the first sub-portions D1 and the second through hole M2 are clamped and fixed, so that the supporting portion 203a and the bezel 203 can be more firmly mounted.

Fig. 10 is an AA' cross-sectional view of the display module according to the embodiment of fig. 2, and fig. 11 is a partially enlarged view of the bezel of fig. 10. Please refer to fig. 10 and fig. 11, which is different from fig. 9 in that when the bezel 203 includes the convex structure 203b, along a direction perpendicular to the light-emitting surface of the display module 100, an orthographic projection of the first sub-region S1 on the light-emitting surface covers an orthographic projection of the first through hole M1 and the second through hole M2 on the light-emitting surface, that is, the first through hole M1 and the second through hole M2 are both disposed on the convex structure 203 b; the supporting portion 203a includes a first sub-portion D1, a second sub-portion D2, and a connecting portion D3, wherein the first sub-portion D1 is engaged and fixed with the second through hole M2, the second sub-portion D2 is engaged and fixed with the first through hole M1, and the connecting portion D3 is located on a side of the second sub-portion D2 away from the reflective layer 202.

Fig. 12 is an AA' cross-sectional view of the display module according to the embodiment of fig. 2, and fig. 13 is a partially enlarged view of the bezel of fig. 12. Please refer to fig. 12 and fig. 13, which are different from fig. 10 in that along a direction perpendicular to the light exit surface of the display module 100, the orthographic projection of the first sub-area S1 on the light exit surface covers the orthographic projection of the first through hole M1 on the light exit surface, and the orthographic projection of the second sub-area S2 on the light exit surface covers the orthographic projection of the second through hole M2 on the light exit surface, that is, only the first through hole M1 is disposed in the protruding stage structure 203 b.

Of course, the supporting portion 203a in this embodiment may have various shapes and sizes, and fig. 9 to 13 only schematically illustrate the structure of the supporting portion 203 a. In order to further reinforce the support portion 203a and the bezel 203, the support portion 203a may further include a plurality of first sub portions D1, and the bezel 203 may further include a plurality of second through holes M2, so that the support portion 203a is firmly fixed to the bezel 203 by the corresponding engagement of the first sub portions D1 and the second through holes M2.

Optionally, the transparent support material T comprises at least one of polymethylmethacrylate and polycarbonate.

In this embodiment, the transparent supporting material T may be an optical-grade resin material, such as PMMA (Poly Methyl methacrylate, commonly called acrylic) or PC (Polycarbonate). PMMA and PC have the advantages of low cost, difficult breakage, good light transmission and the like, wherein the optical transmittance of PMMA is about 93 percent, and the optical transmittance of PC is about 89 percent. Therefore, the supporting portion 203a made of the two materials can provide a good supporting force for the first through hole M1, and can prevent light reflected by a finger from being blocked, so that the light incident amount of the fingerprint sensor is increased, and the accuracy of fingerprint identification is ensured.

Fig. 14 is a schematic structural diagram of a display device 200 according to an embodiment of the present disclosure. Based on the same inventive concept, the present application further provides a display apparatus 200, as shown in fig. 14, the display apparatus 200 includes a display module 100, and the display module 100 is the display module 100 provided in any of the embodiments of the present application, and repeated descriptions are omitted. The touch display device 200 provided by the present application may be: any product or component with touch control function and display function, such as mobile phone, tablet computer, display, notebook computer, digital photo frame, navigator, etc.

According to the embodiments, the application has the following beneficial effects:

among display module assembly and display device that this application provided, backlight unit includes light guide plate, reflection stratum and chase, and wherein, the chase includes supporting part and first through-hole. Because the supporting part contacts with the reflecting layer, therefore can make light guide plate and reflecting layer closely laminate, not only avoid reflecting layer and light guide plate to lead to warp deformation because of electrostatic adsorption, also can prevent to touch the main part, the light guide plate takes place slight deformation and uneven air bed appears like finger press back, has consequently eliminated the air gap between the membrane material among the backlight unit, and then effectively restraines Newton's ring's production, has improved optics fingerprint identification's accuracy.

Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A display module, comprising:

a display panel;

the backlight module comprises a light guide plate, a reflecting layer and an iron frame, wherein the iron frame comprises a supporting part and a first through hole; the first through hole penetrates through the iron frame along a direction perpendicular to a light-emitting surface of the display module, the iron frame is located on one side, away from the display panel, of the light guide plate, the reflection layer is located between the light guide plate and the iron frame, the supporting portion is in contact with the reflection layer, and the orthographic projection of the supporting portion on the light-emitting surface covers the orthographic projection of the first through hole on the light-emitting surface;

the surface of one side of the supporting part, which is close to the light-emitting surface of the display module, comprises a plurality of sawtooth structures;

each sawtooth structure comprises a first surface and a second surface facing one side of a light emitting surface of the display module, and the first surface is intersected with the second surface;

the iron frame comprises a first sub-area and a second sub-area, and is perpendicular to the direction of the light emitting surface of the display module, in the range of the first sub-area, the surface of the iron frame facing one side of the light emitting surface and the vertexes of the sawtooth structures are located on the same plane.

2. The display module of claim 1, wherein the bezel further comprises a boss structure; along the direction perpendicular to the light-emitting surface of the display module, the boss structure protrudes towards the side close to the display panel, and the orthographic projection of the first through hole on the light-emitting surface is located in the orthographic projection of the boss structure on the light-emitting surface.

3. The display module according to claim 2, wherein the supporting portion comprises a transparent supporting material, and the transparent supporting material is filled in the first through hole.

4. The display module as claimed in claim 2, wherein a surface of the light guide plate adjacent to the reflective layer comprises a plurality of bump structures.

5. The display module according to claim 4, wherein the plurality of bump structures comprise a first bump structure and a second bump structure, the bezel comprises a first sub-area and a second sub-area, and the bump structure is located in the first sub-area;

along a direction perpendicular to a light-emitting surface of the display module, the orthographic projection of the first bump structure on the light-emitting surface covers the orthographic projection of the first sub-area on the light-emitting surface, and the orthographic projection of the second bump structure on the light-emitting surface covers the orthographic projection of the second sub-area on the light-emitting surface; and the arrangement density of the first bump structures is less than that of the second bump structures.

6. The display module of claim 1, wherein the reflective layer is an infrared light transmissive reflective sheet.

7. The display module of claim 3, wherein the transparent support material comprises at least one of polymethyl methacrylate and polycarbonate.

8. The display module of claim 7, wherein the support portion is formed by an injection molding process.

9. A display device, comprising the display module of any one of claims 1 to 8.