Display module and display device

Abstract

A display module (100) and a display device (1000). The display module (100) comprises: a liquid crystal module (20), a cover plate (10), and a texture recognition unit. The texture recognition unit comprises a first light source (41) and a texture sensing module (42). The first light source (41) is located on a side of the cover plate (10) close to the liquid crystal module (20), and is configured to emit invisible light. The texture sensing module (42) is located on a side of the liquid crystal module (20) away from the cover plate (10). The wavelength range of light allowed to pass through the cover plate (10) and the liquid crystal module (20) includes the wavelength range of invisible light. The texture sensing module (42) is configured to collect reflected light after the invisible light is irradiated onto a target object (01) to identify the texture of the target object (01).

Description

Technical Field

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

[0002] With the development of technology, the use of under-screen fingerprint recognition technology in mobile display devices can increase the functionality of mobile display devices and also help to increase the screen-to-body ratio of mobile display devices. Summary of the invention

[0003] On the one hand, a display module is provided. The display module includes: a liquid crystal module, a cover plate and a texture recognition unit. The texture recognition unit includes a first light source and a texture sensing module. The first light source is located on a side of the cover plate close to the liquid crystal module and is configured to emit invisible light. The texture sensing module is located on a side of the liquid crystal module away from the cover plate. The wavelength range of light allowed to pass through by the cover plate and the liquid crystal module includes the wavelength range of the invisible light. The texture sensing module is configured to collect reflected light after the invisible light is irradiated to a target object to identify the texture of the target object.

[0004] In some embodiments, the display module further includes an edge-entry backlight module. The edge-entry backlight module includes: a second light source, a light guide plate, a reflective sheet, and at least one layer of optical film. The light guide plate is located on the side of the liquid crystal module away from the cover plate. The second light source is located on the side of the light guide plate and is configured to emit visible light. The at least one layer of optical film is located on the side of the light guide plate close to the liquid crystal module, and the wavelength range of light allowed to pass includes the wavelength range of the invisible light and the wavelength range of the visible light. The reflective sheet is located on the side of the light guide plate away from the liquid crystal module, and is configured to reflect the visible light and transmit the invisible light. The texture sensor module is located on the side of the reflective sheet away from the light guide plate.

[0005] In some embodiments, the liquid crystal module has a display area. The orthographic projections of the first light source and the second light source on the cover plate are located outside the same side boundary of the orthographic projections of the display area on the cover plate in a direction parallel to the cover plate.

[0006] In some embodiments, the edge-entry backlight module further comprises a back plate. The back plate is located on a side of the reflective sheet close to the texture sensor module. An opening is provided at a portion of the back plate opposite to the texture sensor module, and the opening allows the reflected light after the invisible light is irradiated to the target object to pass through and irradiate the texture sensor module.

[0007] In some embodiments, the liquid crystal module has a display area, and the orthographic projection of the opening on the cover plate is located within the orthographic projection of the display area on the cover plate.

[0008] In some embodiments, the liquid crystal module includes a chip on film. The first light source is disposed on a surface of the chip on film close to the cover plate and is electrically connected to the chip on film.

[0009] In some embodiments, the display module further comprises a printed circuit board, which is located on a side of the liquid crystal module away from the cover plate and is electrically connected to the chip-on-film.

[0010] In some embodiments, the display module further comprises a packaging frame sealed to the cover plate. The packaging frame comprises a receiving groove. The liquid crystal module and the texture recognition unit are respectively located in the receiving groove. The texture sensor module is arranged on the bottom surface of the receiving groove, and the first light source is arranged on the inner side surface of the receiving groove.

[0011] In some embodiments, a light emitting surface of the first light source intersects with a surface of the cover plate close to the liquid crystal module.

[0012] In some embodiments, the accommodating groove is configured to have an angle between an inner side surface of the first light source and a bottom surface of the groove, and the angle is an obtuse angle.

[0013] In some embodiments, a light emitting surface of the first light source is perpendicular or substantially perpendicular to a surface of the cover plate close to the liquid crystal module.

[0014] In some embodiments, the accommodating groove is configured to set the inner side surface of the first light source as a step surface. The first light source is located on a plane of the step surface parallel to the bottom surface of the groove, and the light emitting surface of the first light source is parallel to the surface of the cover plate close to the liquid crystal module.

[0015] In some embodiments, the first light source is glued to a surface of the cover plate close to the liquid crystal module.

[0016] In some embodiments, the first light source includes a flexible circuit board carrier and at least one invisible light lamp. The at least one invisible light lamp is disposed on the flexible circuit board carrier and is electrically connected to the flexible circuit board carrier.

[0017] In some embodiments, the display module further comprises a printed circuit board, which is located on a side of the liquid crystal module away from the cover plate and is electrically connected to the texture sensor module.

[0018] In another aspect, a display device is provided, wherein the display device comprises the display module as described in some of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in some embodiments of the present disclosure, the drawings required for use in the description of some embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and a person skilled in the art can also obtain other drawings based on these drawings.

[0020] Figure 1 is a structural diagram of a display module according to some embodiments of the present disclosure;

[0021] Figure 2 is a structural diagram of another display module according to some embodiments of the present disclosure;

[0022] Figure 3 is a structural diagram of another display module according to some embodiments of the present disclosure;

[0023] Figure 4 is a schematic diagram of an effective light emission angle of a first light source according to some embodiments of the present disclosure;

[0024] Figure 5 is a structural diagram of another display module according to some embodiments of the present disclosure;

[0025] Figure 6 is a schematic diagram of another effective light emission angle of a first light source in some embodiments of the present disclosure;

[0026] Figure 7 is a structural diagram of another display module according to some embodiments of the present disclosure;

[0027] Figure 8 is a schematic diagram of an effective light output angle of another first light source according to some embodiments of the present disclosure;

[0028] Fig. 9 is a structural diagram of another display module according to some embodiments of the present disclosure;

[0029] Fig.10 is a structural diagram of a first light source according to some embodiments of the present disclosure;

[0030] Fig.11 is a structural diagram of a texture sensing module according to some embodiments of the present disclosure;

[0031] Fig.12 is a connection diagram of a first light source and a texture sensing module according to some embodiments of the present disclosure;

[0032] Fig.13is a schematic diagram of a display device according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in some embodiments of the present disclosure to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on some embodiments in the present disclosure, all other embodiments that can be obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0034] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0035] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0036] At present, liquid crystal display devices represented by liquid crystal displays (LCD) have occupied a certain position in the display field due to their advantages such as lightness, low power consumption, no radiation, good color purity, and high contrast. In addition, display devices with a high screen-to-body ratio have also become one of the most popular products among consumers due to their unique appearance. Therefore, the use of under-screen fingerprint recognition technology in liquid crystal display devices can not only increase the use functions of liquid crystal display devices, but also help to increase the screen-to-body ratio of liquid crystal display devices.

[0037] Based on this, some embodiments of the present disclosure provide a display module to be applied to a liquid crystal display device, so as to realize under-screen texture recognition of the liquid crystal display device.

[0038] See also Figures 1 to 9 The display module 100 includes a cover plate 10, a liquid crystal module 20, a backlight module 30 and a texture recognition unit which are arranged in sequence. The texture recognition unit includes a first light source 41 and a texture sensor module 42.

[0039] The first light source 41 is located on a side of the cover plate 10 close to the liquid crystal module 20 and is configured to emit invisible light. Optionally, the first light source 41 is an infrared light source.

[0040] The cover plate 10 is located on the side of the liquid crystal module 20 away from the backlight module 30. The cover plate 10 is a light-transmitting cover plate, and the wavelength range of light that it allows to pass includes the wavelength range of invisible light emitted by the first light source 41 and the wavelength range of visible light provided by the backlight module 30. Optionally, the cover plate 10 is a transparent glass that can transmit invisible light.

[0041] The liquid crystal module 20 includes an array substrate 21, an opposing substrate 23, and a liquid crystal layer 22 disposed between the array substrate 21 and the opposing substrate 23. The array substrate 21 and the opposing substrate 23 are assembled by a sealing glue, and the liquid crystal layer 22 is confined within the area surrounded by the sealing glue. Optionally, when the color filter layer is disposed on the opposing substrate 23, the opposing substrate 23 is a color filter substrate.

[0042] In some examples, the opposing substrate 23 is located on the side of the array substrate 21 close to the cover plate 10. The liquid crystal module 20 also includes an upper polarizing layer 24 located on the side of the opposing substrate 23 close to the cover plate 10, and a lower polarizing layer 25 located on the array substrate 21 close to the backlight module 30. It can be understood that the wavelength range of visible light is 380nm to 780nm, and the wavelength range of invisible light is quite different from that of visible light. For example, when the invisible light is infrared light, its wavelength range is greater than 850nm. As a result, the upper polarizing layer 24 and the lower polarizing layer 25 in the liquid crystal module 20 will only polarize the visible light, and basically will not cause light loss to the invisible light.

[0043] Of course, the structure of the liquid crystal module 20 is not limited to this, and the following embodiments are only schematic illustrations of the liquid crystal module 20 using the above structure as an example. In addition, the liquid crystal module 20 can be any one of a FFS (Fringe Field Switching) liquid crystal module, an IPS (In Plane Switch) liquid crystal module, and a TN (Twist Nematic) liquid crystal module.

[0044] The backlight module 30 is configured to provide a display light signal to the liquid crystal module 20. In some examples, the backlight module 30 is an edge-type backlight module, which includes a second light source 31, a light guide plate 32, a reflective sheet 33 and at least one optical film.

[0045] like Figure 2 As shown, the light guide plate 32 is located on the side of the liquid crystal module 20 away from the cover plate 10. The second light source 31 is located on the side of the light guide plate 32 and is configured to emit visible light. Optionally, the second light source 31 is a light-emitting diode (LED) light bar, which includes at least one LED.

[0046] The at least one layer of optical film is located on the side of the light guide plate 32 close to the liquid crystal module 20, and the wavelength range of light allowed to be transmitted includes the wavelength range of the invisible light emitted by the first light source 41 and the wavelength range of the visible light emitted by the second light source 31. Optionally, the at least one layer of optical film is a two-layer optical film, and the two-layer optical film includes a diffusion film 34 and a composite brightness enhancement film 35 stacked in sequence on the side of the light guide plate 32 close to the liquid crystal module 20. Here, the materials of the diffusion film 34 and the composite brightness enhancement film 35 can be selected and set according to actual needs, and are limited to being able to transmit the invisible light emitted by the first light source 41 and the visible light emitted by the second light source 31.

[0047] The reflective sheet 33 is located on the side of the light guide plate 32 away from the liquid crystal module 20, and is configured to reflect the visible light emitted by the second light source 31 and transmit the invisible light emitted by the first light source 41. That is, the reflective sheet 33 not only has the function of reflecting the visible light emitted by the second light source 31, but also can transmit the invisible light emitted by the first light source 41. Optionally, when the first light source 41 is an infrared light source, the reflective sheet 33 adopts an infrared transmission reflective sheet, whose reflectivity for visible light of 380nm to 780nm is close to 100%, and its transmittance for infrared light is close to 90%, and it can have good infrared transmission characteristics without affecting its visible light reflectivity.

[0048] When the backlight module 30 adopts the above structure, the reflected light of the invisible light emitted by the first light source 41 after irradiating the target object can easily pass through the backlight module 30 with almost no interference, for example, it will not be scattered by the optical film, blocked by the reflective sheet 33, etc., thereby ensuring its integrity to achieve accurate recognition of the texture information of the target object.

[0049] The texture sensing module 42 is located on the side of the liquid crystal module 20 away from the cover plate 10. For example, when the display module 100 adopts the above structure, the texture sensing module 42 is located on the side of the reflective sheet 33 in the backlight module 30 away from the light guide plate 32. The texture sensing module 42 is configured to collect the reflected light after the invisible light emitted by the first light source 41 is irradiated to the target object, so as to identify the texture of the target object.

[0050] It is understandable that the target object in some of the above embodiments may be a finger, a palm or other object with texture, and some embodiments of the present disclosure do not limit this. The texture sensor module 42 is configured to identify the texture of the target object, and the texture sensor module 42 may be a fingerprint sensor module or a palm print sensor module, etc., and the specific setting can be selected according to actual needs.

[0051] The following is a schematic description by taking the target object as the finger 01 and the texture sensing module 42 as the fingerprint sensing module as an example.

[0052] The texture sensing module 42 is matched with the first light source 41. In some examples, the first light source 41 is an infrared light source, and the texture sensing module 42 is a lens-type infrared fingerprint sensing module. Figure 2 and Fig.11 , the lens-type infrared fingerprint sensor module at least includes an infrared sensor 422, an infrared lens 423 and a first circuit board 421, wherein the infrared lens 423 is located on the light incident side of the infrared sensor 422, and the infrared sensor 422 is electrically connected to the first circuit board 421. The infrared lens 423 can filter light in other wavelength ranges other than infrared light, thereby preventing light in other wavelength ranges from interfering with the optical signal collection of the infrared sensor 422. When the display module 100 also includes a printed circuit board (PCB board) 7, the first circuit board 421 can be electrically connected to the printed circuit board 7 through a board-to-board connector (BTB connector) 8. In this way, using the lens-type infrared fingerprint sensor module, single-point fingerprint recognition can be effectively realized, and it has the advantages of low cost, small module size, and high sensitivity.

[0053] In the disclosed embodiment, after the invisible light emitted by the first light source 41 passes through the cover plate 10 and irradiates the finger 01, it can form reflected light with different light intensities according to the valleys or ridges in the fingerprint of the finger 01. After the reflected light passes through the cover plate 10, the liquid crystal module 20 and the backlight module 30 in sequence, it can be irradiated into the texture sensor module 42, so that it is collected by the texture sensor module 42, so that the texture sensor module 42 forms a light and dark texture image according to the reflected light. The first light source 41 is located on the side of the cover plate 10 close to the liquid crystal module 20, so that the invisible light emitted by the first light source 41 only needs to pass through the backlight module 30 once from the beginning of emission to the collection of the invisible light by the texture sensor module 42, thereby avoiding the interference of the backlight module 30 on the transmission of the invisible light, and can effectively improve the utilization rate of the invisible light. In addition, a clear fingerprint image can be formed to improve the success rate of fingerprint recognition. In addition, in the embodiment of the present disclosure, the texture recognition unit is located under the screen of the display module 100 , which is beneficial to improving the screen-to-body ratio of the display module 100 .

[0054] In some embodiments, see Figure 2 , Figure 3 , Figure 5 , Figure 7 and Fig. 9 , the liquid crystal module 20 has a display area AA and a peripheral area located on at least one side of the display area AA. The orthographic projections of the first light source 41 and the second light source 31 on the cover plate 10 are located outside the same side boundary of the orthographic projections of the display area AA on the cover plate 10 along a direction parallel to the cover plate 10. That is to say, the first light source 41 and the second light source 31 are located on the same side of the liquid crystal module 20 along a direction parallel to the cover plate 10.

[0055] Here, the invisible light emitted by the first light source 41 and the visible light emitted by the second light source 31 have different wavelength ranges, that is, the invisible light and the visible light will not interfere with each other. Therefore, arranging the first light source 41 and the second light source 31 on the same side of the liquid crystal module 20 along the direction parallel to the cover plate 10 is conducive to reducing the area of ​​the peripheral area of ​​the display module 100, so as to further improve the screen-to-body ratio of the display module 100.

[0056] In some embodiments, please refer to Figure 2 , Figure 3 , Figure 5 , Figure 7 and Fig. 9 The backlight module 30 further includes a back plate 36. The back plate 36 is located on a side of the reflective sheet 33 close to the texture sensor module 42 and is configured to carry other components of the backlight module 30, such as the second light source 31, the light guide plate 32, the reflective sheet 33, and the like.

[0057] Optionally, the back plate 36 is a metal back plate. The second light source 31 is electrically connected to the printed circuit board 7 located on the side of the back plate 36 away from the second light source 31 through a second circuit board 62 (eg, a flexible circuit board).

[0058] The portion of the back plate 36 opposite to the texture sensing module 42 is provided with an opening 37. The shape and size of the opening 37 can be selected and set according to actual needs, and some embodiments of the present disclosure are not limited to this. Optionally, the orthographic projection of the opening 37 on the cover plate 10 overlaps or partially overlaps with the orthographic projection of the texture sensing module 42 on the cover plate 10. In this way, the opening 37 allows the reflected light after the invisible light emitted by the first light source 41 irradiates the target object to pass through and irradiate the texture sensing module 42.

[0059] In addition, optionally, the orthographic projection of the opening 37 on the cover plate 10 is located within the orthographic projection of the display area AA on the cover plate 10 , which can effectively improve the screen-to-body ratio of the display module 100 .

[0060] It should be supplemented that the light-emitting angle of the first light source 41 is limited, and therefore the opening 37 in the back panel 36 is arranged close to the first light source 41 in a direction parallel to the cover panel 10, that is, the texture sensing module 42 is arranged close to the first light source 41 in a direction parallel to the cover panel 10, which can ensure that the texture sensing module 42 can receive sufficient reflected light of invisible light.

[0061] In some embodiments, see Figure 2 The liquid crystal module 20 includes a chip on flex (Chip On Film, referred to as COF) 61. The display module 100 also includes a printed circuit board 7 located on the side of the liquid crystal module 20 away from the cover plate 10. One end of the COF 61 is bound to the portion of the array substrate 21 in the liquid crystal module 20 located in the peripheral area, and the other end is electrically connected to the printed circuit board 7, and is configured to realize signal transmission between the printed circuit board 7 and each signal trace in the array substrate 21.

[0062] The first light source 41 is disposed on the surface of the COF 61 close to the cover plate 10 and is electrically connected to the COF 61. Optionally, the first light source 41 is welded on the COF 61. In this way, the first light source 41 can be electrically connected to the printed circuit board 7 through the COF 61 to simplify the connection circuit or connector required for the first light source 41, which is conducive to reducing the production cost of the display module 100. In addition, there is no need to consider adding an avoidance space inside the display module 100 to install the first light source 41, and the structure is simple and easy to manufacture.

[0063] In addition, for example, Figure 2 As shown, the first light source 41 and the second light source 31 are correspondingly located at a side of the array substrate 21 in the liquid crystal module 20 configured to be bound to the COF 61 .

[0064] In some other embodiments, see Figure 3 to Figure 9 The display module 100 further includes a packaging frame 5 sealed with the cover plate 10. The packaging frame 5 includes a receiving groove, and the liquid crystal module 20 and the texture recognition unit are respectively located in the receiving groove.

[0065] For example, the texture sensing module 42 is disposed on the bottom surface of the receiving groove of the packaging frame 5 , and the first light source 41 is disposed on the inner side surface of the receiving groove of the packaging frame 5 .

[0066] Optionally, the texture sensor module 42 is glued to the bottom surface of the receiving groove of the packaging frame 5 by double-sided adhesive or fixing adhesive. Similarly, the first light source 41 is glued to the inner side surface of the receiving groove of the packaging frame 5 by double-sided adhesive or fixing adhesive.

[0067] In some embodiments, see Fig.10 The first light source 41 includes a flexible circuit board carrier 411 and at least one invisible light lamp 412. The at least one invisible light lamp 412 is disposed on the flexible circuit board carrier 411 and electrically connected to the flexible circuit board carrier 411. Optionally, the invisible light lamp 412 uses an infrared light-emitting diode (IR LED), such as a top-emitting IR LED. The invisible light lamp 412 is fixed to the flexible circuit board carrier 411 by welding, and each invisible light lamp 412 is electrically connected to the texture sensor module 42 through the flexible circuit board carrier 411.

[0068] Here, the shape of the flexible circuit board carrier 411 can be selected and set according to actual needs. For example, Fig.10 As shown, the flexible circuit board carrier 411 adopts a T-shaped or approximately T-shaped structure. The at least one invisible light lamp 412 is evenly arranged at the T-shaped top of the flexible circuit board carrier 411, and the T-shaped bottom of the flexible circuit board carrier 411 is provided with a connecting portion 410 configured to be electrically connected to the texture sensor module 42 or a BTB connector. The flexible circuit board carrier 411 is glued to the corresponding inner side surface of the receiving groove of the packaging frame 5 by double-sided adhesive or fixing adhesive.

[0069] Of course, the structure of the first light source 41 is not limited to this. Figure 7 and Figure 8 The first light source 41 is an invisible light bar, and the invisible light bar can be electrically connected to the texture sensor module 42 through a third circuit board 63 (such as a flexible circuit board).

[0070] The shapes of the components in the above-mentioned texture sensor module 42 can be selected and set according to actual needs. Take the texture sensor module 42 as a lens-type infrared fingerprint sensor module as an example. Fig.11 As shown, the infrared sensor 422 and the infrared lens 423 are circular structures, and the first circuit board 421 is I-shaped. The first circuit board 421 has two opposite edges, and the connecting parts 410 are respectively provided. The connecting parts 410 can be used to electrically connect with the BTB connector or the flexible circuit board carrier 411 in the first light source 41. The connection method can be referred to in Fig.12 , which will not be described in detail here.

[0071] In some of the above embodiments, each component electrically connected to the printed circuit board 7, such as the first light source 41, the second light source 31, the texture sensor module 42, and the array substrate 21, can exchange data with the printed circuit board 7 so as to perform corresponding actions according to the control signal sent by the printed circuit board 7, such as controlling the invisible light lamp 412 in the first light source 41 to turn on or off. This embodiment of the disclosure will not be described in detail.

[0072] The invisible light emitted by the first light source 41 needs to be irradiated onto the target object so as to be reflected by the target object to form a texture light signal. Therefore, the light emitting surface of the first light source 41 can be arranged in a variety of ways relative to the surface of the cover plate 10.

[0073] For some examples, see Figure 3 to Figure 6 , the light emitting surface of the first light source 41 intersects with the surface of the cover plate 10 close to the liquid crystal module 20. That is, there is an angle between the light emitting surface of the first light source 41 and the surface of the cover plate 10 close to the liquid crystal module 20. In the case where the first light source 41 includes a top-emitting IR LED, the light emitting surface of the first light source 41 is the top surface of the IR LED.

[0074] Optional, such as Figure 3 As shown, the configuration of the accommodating groove of the packaging frame 5 is to set the inner side surface of the first light source 41 and the bottom surface of the groove to have an angle α, and the angle α is an obtuse angle. That is to say, the configuration of the accommodating groove of the packaging frame 5 is to set the inner side surface of the first light source 41 as an inclined surface, and after the first light source 41 is fixed on the inner side surface, the light emitting surface of the first light source 41 is also an inclined surface, and the angle between the light emitting surface of the first light source 41 and the surface of the cover plate 10 close to the liquid crystal module 20 is: π-α.

[0075] The above-mentioned angle α is related to the light-emitting angle of the invisible light lamp 412 in the first light source 41, but its influencing factors are not limited to this. For example, the thickness of the display module 100, the relative position of the first light source 41 and the texture sensor module 42, etc., will all affect the angle α. In some examples, the light-emitting angle of the invisible light lamp 412 in the first light source 41 is 120°, and the configuration of the receiving groove of the packaging frame 5 is to set the angle α between the inner side surface of the first light source 41 and the bottom surface of the groove of the receiving groove to satisfy: 120°≤α≤150°. In other examples, the light-emitting angle of the invisible light lamp 412 in the first light source 41 is 140°, and the configuration of the receiving groove of the packaging frame 5 is to set the angle α between the inner side surface of the first light source 41 and the bottom surface of the groove of the receiving groove to satisfy: 110°≤α≤160°.

[0076] When the angle α is an obtuse angle, Figure 4 As shown, most of the invisible light emitted by the first light source 41 can be effectively irradiated onto the target object, such as the finger 01, which is beneficial to improve the utilization rate of the invisible light, thereby improving the accuracy of texture recognition of the target object.

[0077] Of course, if Figure 5 and Figure 6 As shown, the light emitting surface of the first light source 41 is perpendicular or substantially perpendicular to the surface of the cover plate 10 close to the liquid crystal module 20, which is also allowed. Figure 5 and Figure 6 As shown, the first light source 41 includes a top-emitting IRLED, the top surface of the IR LED is perpendicular or approximately perpendicular to the surface of the cover plate 10 close to the liquid crystal module 20, and the effective light emission angle β (i.e., the angle that can effectively irradiate the target object such as the finger 01) of the invisible light emitted by the IR LED is half of its light emission angle. The thickness of the IR LED is very small, and such a setting can effectively reduce the distance from the corresponding edge of the cover plate 10 to the display area AA, that is, it can effectively reduce the peripheral area of ​​the corresponding side of the display module 100, thereby improving the screen ratio of the display module 100.

[0078] In addition, the first light source 41 may be disposed in the display module 100 in other ways, for example, Figure 7 As shown, the configuration of the receiving groove of the packaging frame 5 is to set the inner side surface of the first light source 41 as a step surface. The first light source 41 is located on the plane of the step surface of the receiving groove parallel to the bottom surface of the groove, and the light emitting surface of the first light source 41 is parallel to the surface of the cover plate 10 close to the liquid crystal module 20.

[0079] For example, Figure 7 and Figure 8As shown, the first light source 41 includes a top-emitting IR LED, the top surface of the IR LED is parallel to the surface of the cover plate 10 close to the liquid crystal module 20, and the effective light emission angle β of the invisible light emitted by the IR LED is half of its light emission angle. In this way, it is convenient to realize the design and production of the display module 100, which is conducive to improving the production efficiency of the display module 100.

[0080] In some other embodiments, see Fig. 9 , the first light source 41 is glued to the surface of the cover plate 10 close to the liquid crystal module 20. Optionally, the first light source 41 is glued to the cover plate 10 by double-sided tape or fixing tape. In this way, there is no need to carry out a detailed structural design of the packaging frame 5 of the display module 100, for example, a space is reserved on the inner side of the packaging frame 5 to install the first light source 41, and the structure is relatively simple and easy to implement.

[0081] Please continue reading Fig. 9 The first light source 41 is glued to the surface of the cover plate 10 close to the liquid crystal module 20, and the first light source 41 is electrically connected to the printed circuit board 7 through the second circuit board 63 (for example, a flexible circuit board). The second circuit board 63 (for example, a flexible circuit board) can be fixed to the corresponding inner side surface of the packaging frame 5, for example, by gluing.

[0082] Some embodiments of the present disclosure also provide a display device. Fig.13 As shown, the display device 1000 includes the display module 100 described in some embodiments above. The beneficial effects that can be achieved by the display device provided by some embodiments of the present disclosure are the same as the beneficial effects that can be achieved by the display module provided by some embodiments above, and will not be described in detail here.

[0083] The above-mentioned display device provided in some embodiments of the present disclosure can be any device applied to the display field, whether it is moving (e.g., video) or fixed (e.g., still image), and whether it is text or picture image. More specifically, it is expected that the embodiments can be implemented in a variety of electronic devices, including but not limited to mobile phones, wireless devices, personal data assistants (Portable Android Device, abbreviated as PAD), handheld or portable computers, GPS (Global Positioning System) receivers / navigators, cameras, MP4 (full name MPEG-4 Part 14) video players, camcorders, television monitors, flat-panel displays, computer monitors, aesthetic structures (e.g., for displays showing images of a piece of jewelry), etc.

[0084] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0085] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A display module, comprising: Liquid crystal module, cover plate and texture recognition unit; The texture recognition unit comprises: A first light source configured to emit invisible light; A texture sensing module is located on a side of the liquid crystal module away from the cover plate; Wherein, the wavelength range of light allowed to pass through the cover plate and the liquid crystal module includes the wavelength range of the invisible light; The texture sensing module is configured to collect reflected light after the invisible light is irradiated onto the target object, so as to identify the texture of the target object; The liquid crystal module includes a chip-on-film; the first light source is disposed on a surface of the chip-on-film close to the cover plate and is electrically connected to the chip-on-film; or, The display module also includes a packaging frame sealed with the cover plate; the packaging frame includes a receiving groove; the liquid crystal module and the texture recognition unit are respectively located in the receiving groove; wherein the texture sensor module is arranged on the bottom surface of the receiving groove, and the first light source is arranged on the inner side surface of the receiving groove.

2. The display module according to claim 1, further comprising: Edge-type backlight module; The edge-type backlight module comprises: A light guide plate, located on a side of the liquid crystal module away from the cover plate; A second light source, located on a side of the light guide plate, configured to emit visible light; At least one layer of optical film, located on a side of the light guide plate close to the liquid crystal module, and allowing the light wavelength range to pass through to include the light wavelength range of the invisible light and the light wavelength range of the visible light; a reflective sheet, located on a side of the light guide plate away from the liquid crystal module, and configured to reflect the visible light and transmit the invisible light; Wherein, the texture sensor module is located on a side of the reflective sheet away from the light guide plate.

3. The display module according to claim 2, wherein: The liquid crystal module has a display area; The orthographic projections of the first light source and the second light source on the cover plate are located outside the same side boundary of the orthographic projections of the display area on the cover plate along a direction parallel to the cover plate.

4. The display module according to claim 2, wherein: The edge-type backlight module further includes: A back plate, located on a side of the reflective sheet close to the texture sensing module; The portion of the back plate opposite to the texture sensing module is provided with an opening, and the opening allows the reflected light after the invisible light is irradiated to the target object to pass through and irradiate to the texture sensing module.

5. The display module according to claim 4, wherein: The liquid crystal module has a display area; The orthographic projection of the opening on the cover plate is located within the orthographic projection of the display area on the cover plate.

6. The display module according to claim 1, further comprising a printed circuit board; The printed circuit board is located on a side of the liquid crystal module away from the cover plate and is electrically connected to the chip-on-film.

7. The display module according to claim 1, wherein: The light emitting surface of the first light source intersects with the surface of the cover plate close to the liquid crystal module.

8. The display module according to claim 7, wherein: The accommodating groove is configured such that an angle is formed between an inner side surface of the first light source and a bottom surface of the groove, and the angle is an obtuse angle.

9. The display module according to claim 7, wherein: The light emitting surface of the first light source is perpendicular or substantially perpendicular to the surface of the cover plate close to the liquid crystal module.

10. The display module according to claim 1, wherein: The configuration of the accommodating groove is to set the inner side surface of the first light source as a step surface; The first light source is located on a plane of the step surface parallel to the bottom surface of the groove, and a light emitting surface of the first light source is parallel to a surface of the cover plate close to the liquid crystal module.

11. The display module according to any one of claims 7 to 10, wherein: The first light source comprises: Flexible circuit board carrier; At least one invisible light lamp is disposed on the flexible circuit board carrier and is electrically connected to the flexible circuit board carrier.

12. The display module according to claim 11, further comprising a printed circuit board; The printed circuit board is located on a side of the liquid crystal module away from the cover plate and is electrically connected to the texture sensor module.

13. A display device, comprising the display module according to any one of claims 1 to 12.

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