Display equipment with fingerprint identification device

Abstract

The utility model discloses a fingerprint identification device, comprising a light guide plate which is provided with an upper surface and a lower surface which are oppositely arranged, and the lower surface is provided with a mounting groove; and the fingerprint identification module is arranged in a mounting groove in the lower surface of the light guide plate. The fingerprint identification device has a small thickness. The utility model further provides a backlight device and a display device. The backlight device and the display device comprise the fingerprint identification device.

Description

Technical Field

[0001] The utility model relates to fingerprint recognition technology, in particular to a fingerprint recognition device, a backlight device and a display device. Background Art

[0002] At present, the liquid crystal display (LCD) screen includes a backlight module and a liquid crystal panel, wherein the backlight module provides a uniform light source for the screen, and the liquid crystal panel plays the role of image display. The under-screen fingerprint recognition solution based on the LCD screen is to set the fingerprint recognition module under the backlight module to realize fingerprint recognition.

[0003] The existing solution of stacking the LCD panel, backlight module and fingerprint recognition module will result in the thickness of the entire device being too large. Utility Model Content

[0004] In order to solve the above-mentioned deficiencies in the prior art, the utility model provides a fingerprint recognition device with a relatively small thickness.

[0005] The utility model also provides a backlight device and a display device, comprising the fingerprint recognition device.

[0006] The technical problem to be solved by the utility model is achieved through the following technical solutions:

[0007] A fingerprint recognition device, comprising:

[0008] The light guide plate has an upper surface and a lower surface that are arranged opposite to each other, and the lower surface is provided with a mounting groove;

[0009] The fingerprint recognition module is arranged in the mounting groove on the lower surface of the light guide plate.

[0010] Furthermore, the lower surface of the light guide plate is provided with light guide points in addition to the mounting grooves.

[0011] Furthermore, the light guide plate has at least one side surface between the upper surface and the lower surface, wherein a plurality of light grooves are arranged at intervals on one side surface.

[0012] Furthermore, the light guide plate is provided with a prismatic microstructure at the lamp groove.

[0013] Furthermore, the fingerprint recognition module is an optical fingerprint recognition module, a capacitive fingerprint recognition module or an ultrasonic fingerprint recognition module.

[0014] A backlight device comprises a frame structure, a light source and the above-mentioned fingerprint recognition device, wherein the light source and the fingerprint recognition device are both arranged in the frame structure, and the light source is arranged on one side surface of the light guide plate.

[0015] Furthermore, the backlight device also includes an optical film assembly, and the optical film assembly is arranged on the upper surface of the light guide plate.

[0016] Furthermore, the optical film assembly includes a diffusion film, a lower brightness enhancement film and an upper brightness enhancement film which are stacked in sequence.

[0017] Furthermore, the backlight device also includes a reflective film, which is arranged on the lower surface of the light guide plate and on a side of the fingerprint recognition module facing away from the light guide plate.

[0018] A display device comprises a liquid crystal panel and the above-mentioned backlight device, wherein the liquid crystal panel is arranged on the light emitting surface of the backlight device.

[0019] The utility model has the following beneficial effects: the utility model sets a mounting groove on the lower surface of the light guide plate, and sets the fingerprint recognition module in the mounting groove of the light guide plate. At least a part of the fingerprint recognition module is embedded in the light guide plate, thereby reducing the overall thickness of the light guide plate and the fingerprint recognition module. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the fingerprint recognition device provided by the utility model.

[0021] Figure 2 This is a schematic structural diagram of the backlight device provided by the utility model.

[0022] Figure 3 This is a structural schematic diagram of a display device provided by the utility model. Implementation

[0023] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix", "set" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Embodiment 1

[0027] like Figure 1 As shown, a fingerprint recognition device comprises:

[0028] The light guide plate 230 has an upper surface and a lower surface that are arranged opposite to each other, and the lower surface is provided with a mounting groove;

[0029] The fingerprint identification module 300 is disposed in a mounting groove on the lower surface of the light guide plate 230 .

[0030] The utility model sets a mounting groove on the lower surface of the light guide plate 230 and sets the fingerprint recognition module 300 in the mounting groove of the light guide plate 230. At least a part of the fingerprint recognition module 300 is embedded in the light guide plate 230, thereby reducing the overall thickness of the light guide plate 230 and the fingerprint recognition module 300.

[0031] The light guide plate 230 is used in the backlight device of the display device to guide the direction of the incident light so that the incident light is evenly emitted from its upper surface. It can be but is not limited to a glass light guide plate 230 or a plastic light guide plate 230. The glass light guide plate 230 is mainly made of tempered glass, and the plastic light guide plate 230 is mainly made of PMMA.

[0032] If the light guide plate 230 is a glass light guide plate 230, the mounting groove can be formed by CNC grinding after the light guide plate 230 is prepared and formed; if the light guide plate 230 is a plastic light guide plate 230, the mounting groove can be formed simultaneously when the light guide plate 230 is injection molded by setting a corresponding boss structure at a position corresponding to the injection mold cavity of the light guide plate 230.

[0033] Optimally, the depth of the mounting groove is the same as the thickness of the fingerprint recognition module 300, so that the fingerprint recognition module 300 can be completely embedded in the mounting groove; the fingerprint recognition module 300 and the mounting groove can be bonded with a high-transmittance solid tape or liquid glue. If a solid tape is used, the solid tape will bond and fix the upper end surface (recognition surface) of the fingerprint recognition module 300 to the groove top of the mounting groove. If a liquid glue is used, the liquid glue will fill the entire gap between the fingerprint recognition module 300 and the mounting groove. The solid tape can be, but not limited to, an OCA tape, and the liquid glue can be, but not limited to, an epoxy resin.

[0034] The lower surface of the light guide plate 230 is provided with light guide dots 231 in addition to the mounting grooves. The light guide dots 231 may be ink dots formed on the lower surface of the light guide plate 230 by screen printing ink, or may be concave-convex dots formed on the lower surface of the light guide plate 230 by dot stamping.

[0035] The function of the light guide dots 231 is to form a diffuse reflection structure on the lower surface of the light guide plate 230. When the incident light reaches the lower surface of the light guide plate 230, it will be reflected to various directions by the light guide dots 231, and finally form a uniform output from the upper surface of the light guide plate 230.

[0036] The light guide points 231 avoid the installation slots to avoid affecting the recognition effect of the fingerprint recognition module 300 .

[0037] The light guide plate 230 further has at least one side surface between the upper surface and the lower surface, wherein a plurality of light grooves are arranged at intervals on one side surface; and the light guide plate 230 is provided with a prismatic microstructure at the light grooves.

[0038] The lamp trough is used to install the light source of the backlight device. The prism microstructure at the lamp trough mainly diffuses the incident light and can expand the angle of the incident light of the light source.

[0039] The fingerprint recognition module 300 may be, but is not limited to, an optical fingerprint recognition module 300 , a capacitive fingerprint recognition module 300 , or an ultrasonic fingerprint recognition module 300 .

[0040] In some backlight devices, in order to increase brightness, the light source is arranged on two opposite sides or two adjacent sides of the light guide plate 230. In this case, the light groove and prism microstructure are arranged on two opposite sides or two adjacent sides of the light guide plate 230. Embodiment 2

[0041] like Figure 2As shown, a backlight device 200 includes a frame structure 210, a light source 220 and the fingerprint recognition device described in Example 1, wherein the light source 220 and the fingerprint recognition device are both arranged in the frame structure 210, and the light source 220 is arranged on one side surface of the light guide plate 230.

[0042] The backlight device 200 also includes an optical film assembly 240, which is arranged on the upper surface of the light guide plate 230, and the optical film assembly 240 includes a diffusion film, a lower light enhancement film and an upper light enhancement film stacked in sequence; the backlight device 200 also includes a reflective film 250, which is arranged on the lower surface of the light guide plate 230 and on the side of the fingerprint recognition module 300 facing away from the light guide plate 230.

[0043] The circuit board 310 of the fingerprint recognition module 300 can be connected to the circuit board of the light source 220 to be connected to an external power supply through the circuit board of the light source 220; of course, the circuit board 310 of the fingerprint recognition module 300 can also be directly connected to an external power supply; the frame structure 210 is provided with a groove for the fingerprint recognition module 300 and the circuit board of the light source 220 to extend outward. Embodiment 3

[0044] like Figure 3 As shown, a display device includes a liquid crystal panel 100 and the backlight device 200 described in the second embodiment, wherein the liquid crystal panel 100 is arranged on the light emitting surface of the backlight device 200 .

[0045] The liquid crystal panel 100 includes an upper substrate and a lower substrate which are arranged opposite to each other in an upper and lower direction, and the upper substrate and the lower substrate are sealed and fixed by a frame glue, and the upper substrate, the lower substrate and the space enclosed and sealed by the frame glue are filled with liquid crystal material; an RGB color film is arranged on the surface of the upper substrate facing the lower substrate, and an upper polarizing film is arranged on the surface of the upper substrate facing away from the lower substrate; a TFT circuit is arranged on the surface of the lower substrate facing the upper substrate, and a lower polarizing film is arranged on the surface of the lower substrate facing away from the upper substrate.

[0046] The liquid crystal panel 100 is fixed to the frame structure 210 of the backlight device 200 by means of a light-shielding tape, and the middle of the light-shielding tape is hollowed out to define a light-emitting area of ​​the backlight device 200 ; the light-emitting area of ​​the backlight device 200 corresponds to the display area of ​​the liquid crystal panel 100 .

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the utility model rather than to limit them. Although the embodiments of the utility model are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the utility model can still be modified or replaced by equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A display device having a fingerprint recognition device, characterized in that: The invention comprises a liquid crystal panel and a backlight device, wherein the liquid crystal panel is arranged on the light emitting surface of the backlight device; the backlight device comprises a frame structure, a light source and a fingerprint recognition device, wherein the light source and the fingerprint recognition device are both arranged in the frame structure; the fingerprint recognition device comprises: The light guide plate has an upper surface and a lower surface that are arranged opposite to each other, and the lower surface is provided with a mounting groove; A fingerprint recognition module is arranged in a mounting groove on the lower surface of the light guide plate; The light source is arranged on one side surface of the light guide plate.

2. The display device with a fingerprint recognition device according to claim 1, characterized in that: The lower surface of the light guide plate is provided with light guide points except for the mounting grooves.

3. The display device with a fingerprint recognition device according to claim 1, characterized in that: The light guide plate further has at least one side surface between the upper surface and the lower surface, wherein a plurality of light grooves are arranged at intervals on one side surface.

4. The display device with a fingerprint recognition device according to claim 3, characterized in that: The light guide plate is provided with a prism microstructure at the lamp groove.

5. The display device with a fingerprint recognition device according to claim 1, characterized in that: The fingerprint recognition module is an optical fingerprint recognition module, a capacitive fingerprint recognition module or an ultrasonic fingerprint recognition module.

6. The display device with a fingerprint recognition device according to claim 1, characterized in that: The backlight device further comprises an optical film assembly, and the optical film assembly is arranged on the upper surface of the light guide plate.

7. The display device with a fingerprint recognition device according to claim 6, characterized in that: The optical film assembly comprises a diffusion film, a lower brightness enhancement film and an upper brightness enhancement film which are stacked in sequence.

8. The display device with a fingerprint recognition device according to claim 1, characterized in that: The backlight device further comprises a reflective film, which is arranged on the lower surface of the light guide plate and on a side of the fingerprint recognition module facing away from the light guide plate.

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