WO2020124306A1

WO2020124306A1 - Liquid crystal display fingerprint module, in-screen fingerprint recognition system, and electronic device

Info

Publication number: WO2020124306A1
Application number: PCT/CN2018/121410
Authority: WO
Inventors: 谢浩
Original assignee: 深圳市汇顶科技股份有限公司
Priority date: 2018-12-17
Filing date: 2018-12-17
Publication date: 2020-06-25
Also published as: CN109716352A; CN109716352B

Abstract

Provided in the present application are a liquid crystal display fingerprint module, an in-screen fingerprint recognition system, and an electronic device. The liquid crystal display fingerprint module comprises a display module, a fingerprint light source, and a fingerprint sensor; the display module comprises a prism structure, the prism structure being located at a side of a light guide plate that faces a liquid crystal panel; an inverse prism structure is present between the light guide plate and a photosensitive surface of the fingerprint sensor; and the prism angles of the prism structure and the inverse prism structure face opposite directions. The present application may improve the accuracy of fingerprint recognition.

Description

Liquid crystal display fingerprint module, under-screen fingerprint recognition system and electronic equipment

Technical field

Embodiments of the present application relate to identification technology, and in particular to a liquid crystal display fingerprint module, an under-screen fingerprint identification system, and electronic equipment.

Background technique

With the development of electronic technology, the display screen of electronic equipment gradually develops to a full screen, and the screen ratio is getting higher and higher. This makes the current mainstream capacitive fingerprint module nowhere to be placed, and the optical fingerprint under the screen comes into being.

At present, for organic light-emitting diode (Organic Light-Emitting Diode, OLED for short) display screens, there are more and more applications of under-screen optical fingerprint recognition solutions. For the liquid crystal display (Liquid Crystal Display, referred to as LCD) under-screen optical fingerprint recognition, a fingerprint sensor can be set in the LCD to generate a fingerprint image according to the light reflected by the finger, and then perform fingerprint recognition.

However, in order to improve the display brightness of the LCD, the backlight module of the LCD usually has a prism film, and the prism film reduces the effective field of view of the fingerprint sensor, and also causes distortion of the fingerprint image generated by the fingerprint sensor, which is not conducive to fingerprints Identify.

Summary of the invention

Embodiments of the present application provide a liquid crystal display fingerprint module, an under-screen fingerprint recognition system, and electronic equipment to improve the effective field of view of the fingerprint sensor, avoid distortion of the fingerprint image generated by the fingerprint sensor, and improve the accuracy of fingerprint recognition.

An embodiment of the present application provides a liquid crystal display fingerprint module, including: a display module, a fingerprint light source, and a fingerprint sensor; wherein, the display module includes a liquid crystal panel and a backlight module;

The liquid crystal panel is located above the backlight module; the fingerprint sensor is located below the backlight module; the backlight module includes: a prism structure, a light guide plate and a backlight; the side ends of the light guide plate are provided with The backlight; the prism structure is located on the side of the light guide plate facing the liquid crystal panel; there is a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor; the prism structure and the reverse The direction of the prism angle of the prism structure is opposite;

After being reflected, the light emitted by the fingerprint light source enters the photosensitive surface of the fingerprint sensor through the prism structure, the light guide plate, and the reverse prism structure in sequence.

An embodiment of the present application provides an under-screen fingerprint recognition system, including: suitable for under-screen optical fingerprint detection under a liquid crystal display module with a backlight module. The under-screen fingerprint recognition system includes a fingerprint light source and a fingerprint sensor;

The fingerprint light source is used to provide light for fingerprint detection, the fingerprint sensor is used to detect a fingerprint image of a finger pressed above the liquid crystal display module, and the field of view of the fingerprint sensor is located in the liquid crystal display module Display area

Wherein, the liquid crystal display module includes a liquid crystal panel and a backlight module provided on the back of the liquid crystal panel, the backlight module includes: a prism structure, a light guide plate and a backlight; the side ends of the light guide plate are provided with The backlight; the prism structure is located on the side of the light guide plate facing the liquid crystal panel; there is a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor; the prism structure and the reverse prism The direction of the prism angle of the structure is opposite;

After being reflected, the light emitted by the fingerprint light source enters the photosensitive surface of the fingerprint sensor through the prism film, the light guide plate, and the reverse prism structure in sequence.

An embodiment of the present application also provides an electronic device, including: the above-mentioned liquid crystal display fingerprint module.

Embodiments of the present application provide a liquid crystal display fingerprint module, an under-screen fingerprint recognition system, and electronic equipment, wherein the liquid crystal display fingerprint module may include: a display module, a fingerprint light source, and a fingerprint sensor; wherein, the display module includes a liquid crystal A panel and a backlight module; the liquid crystal panel is located above the backlight module; the fingerprint sensor is located below the backlight module; the backlight module includes: a prism structure, a light guide plate and a backlight; the side ends of the light guide plate are provided with The backlight; the prism structure is located on the side of the light guide plate facing the liquid crystal panel; there is a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor; the prism structure is opposite to the prism angle of the reverse prism structure The light emitted by the fingerprint light source is reflected and sequentially enters the photosensitive surface of the fingerprint sensor through the prism structure, the light guide plate and the reverse prism structure. The liquid crystal display fingerprint module can be provided with a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor, and the fingerprint light after the prism structure is split by the reverse prism structure is combined to ensure the effectiveness of the fingerprint sensor The field of view also avoids fission of the fingerprint image, thereby ensuring the accuracy of the fingerprint recognition of the LCD.

BRIEF DESCRIPTION

In order to more clearly explain the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, without paying any creative labor, other drawings can be obtained based on these drawings.

1 is a schematic diagram 1 of a stack of a liquid crystal display fingerprint module provided by an embodiment of the present application;

2 is a schematic diagram of image restoration of an LCD fingerprint module provided by an embodiment of the present application;

FIG. 3 is a second schematic diagram 2 of a stacked liquid crystal display fingerprint module provided by an embodiment of the present application;

4 is a schematic diagram 3 of a stack of an LCD fingerprint module provided by an embodiment of the present application;

5 is a schematic diagram 4 of a stack of a liquid crystal display fingerprint module provided by an embodiment of the present application;

6 is a schematic diagram 5 of a stack of an LCD fingerprint module provided by an embodiment of the present application;

7 is a position relationship diagram of a backlight source, a fingerprint light source, and a light guide plate adopted by an embodiment of the present application;

8 is a schematic diagram 1 of a layout of a fingerprint module in an electronic device with a liquid crystal display fingerprint module adopted by an embodiment of the present application;

9 is a second schematic layout diagram of a fingerprint module in an electronic device with a liquid crystal display fingerprint module adopted by an embodiment of the present application;

10 is a schematic diagram 3 of a layout of a fingerprint module in an electronic device with a liquid crystal display fingerprint module adopted by an embodiment of the present application;

11 is a schematic diagram 4 of a layout of a fingerprint module in an electronic device with a liquid crystal display fingerprint module adopted by an embodiment of the present application;

12 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

detailed description

To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of this application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present application. The terminology used in the specification of the present application herein is for the purpose of describing specific embodiments only, and is not intended to limit the present application. The term "and/or" as used herein includes any and all combinations of one or more related listed items. In the following, some embodiments of the present application will be described in detail with reference to the drawings. In the case of no conflict, the following embodiments and the features in the embodiments can be combined with each other.

The following embodiments of the present application provide a liquid crystal display fingerprint module, a fingerprint recognition method, an electronic device, and a storage medium, which can be applied to any under-screen optical fingerprint recognition with an LCD such as a smart phone, notebook computer, wearable device, home appliance, etc. Functional electronic devices. The optical fingerprint under the screen of the LCD can be realized in a local area preset in the LCD.

The following provides a description of the embodiments provided by the present application in conjunction with multiple examples.

FIG. 1 is a schematic diagram 1 of a stack of an LCD fingerprint module provided by an embodiment of the present application. As shown in FIG. 1, the LCD fingerprint module may include: a display module 1, a fingerprint light source 2 and a fingerprint sensor 3; wherein, the display module 1 includes: a liquid crystal panel 12 and a backlight module 13.

The liquid crystal panel 12 is located above the backlight module 13. The display module 1 may further include a cover 11, and the liquid crystal panel 12 may be located between the cover 11 and the backlight module 13. The backlight module 13 includes: a prism structure 5, a light guide plate 131 and a backlight 132. A backlight 132 is provided on the side end of the light guide plate 131.

The prism structure 5 is located on the side of the light guide plate 131 facing the liquid crystal panel 12; there is a reverse prism structure 6 between the light guide plate 131 and the photosensitive surface of the fingerprint sensor 3; the direction of the prism angle of the prism structure 5 and the reverse prism structure 6 is opposite;

The light emitted by the fingerprint light source 2 is reflected and sequentially enters the photosensitive surface of the fingerprint sensor 3 through the prism structure 5, the light guide plate 131 and the reverse prism structure 6.

In this embodiment, the display module 1 may be referred to as an LCD display module, and the cover 11 may be a glass cover. The backlight 132 in the backlight module 13 can provide light to the liquid crystal panel 12, and the liquid crystal panel 12 can realize the display function under the illumination of the light emitted by the backlight 132. The backlight 132 is located at the side end of the light guide plate 131 and is used to enter light to the liquid crystal panel 12 through the light guide plate 131. The backlight 132 may be a white light emitting diode (Light Emitting Diode, LED for short).

The fingerprint light source 2 is used to provide fingerprint detection light. The light emitted by the fingerprint light source 2 can pass through the cover plate 11, the liquid crystal panel 12, the prism structure 5, the light guide plate 131 and the light after being reflected by the finger pressed on the cover plate 11 The reverse prism structure 6 is incident on the photosensitive surface of the fingerprint sensor 3 disposed under the backlight module 1 to generate fingerprint image data for fingerprint recognition on the photosensitive surface of the fingerprint sensor 3. Among them, the fingerprint sensor 3 may be referred to as an optical sensor, an image sensor, an optical fingerprint sensor, an optical sensor, or a fingerprint detection sensor.

The prism structure 5 and the reverse prism structure 6 may be located on one side of the light guide plate 131 respectively. The prism angle of the prism structure 5 may face the light guide plate 131, and the prism angle of the reverse prism structure 6 may also face the light guide plate 131. Thus, the prism structure 5 The direction of the prism angle of the reverse prism structure 6 is opposite.

The prism structure 5 can perform light combining processing after the light emitted from the backlight 132 passes through the light guide plate 131 and each film layer 5 in sequence, and then enters the light after the light combining processing into the liquid crystal panel 12, thereby improving the display brightness of the display module.

The light from the fingerprint light source 2 is reflected by the fingers to form fingerprint light. The fingerprint light can be incident on the prism structure 5 through the cover plate 11 and the liquid crystal panel 12 in sequence. The prism structure 5 can perform spectral processing on the incident fingerprint light, and then enter the reverse prism structure 6 through the light guide plate 131.

The reverse prism structure 6 may be located at any position of the light guide plate 131 and the photosensitive surface of the fingerprint sensor 3. In order to avoid affecting the appearance of the LCD fingerprint module, the reverse prism structure 6 may be located on the lower surface of the reflective surface of the light guide plate 131 and the photosensitive surface of the fingerprint sensor 3. The reverse prism structure 6 can combine light of the incident fingerprint light and emit the combined light of the fingerprint light to the photosensitive surface of the fingerprint sensor 3, so that the photosensitive surface of the fingerprint sensor 3 can be generated based on the incident light Fingerprint image for fingerprint recognition.

The following is an explanation with examples. 2 is a schematic diagram of image restoration of a liquid crystal display fingerprint module provided by an embodiment of the present application. In FIG. 2, A indicates the fingerprint of the finger. The light from the fingerprint light source 2 is reflected by the fingerprint A to form fingerprint light. The fingerprint light can be incident on the prism structure 5 through the cover plate 11 and the liquid crystal panel 12 in sequence. The prism structure 5 can perform spectral processing on the incident fingerprint light, and then enter the reverse prism structure 6 through the light guide plate 131. Due to the spectral processing of the prism structure 5, the fingerprint light is split and fission occurs. The reverse prism structure 6 can combine light of the incident fingerprint light, and emit the combined light of the fingerprint light to the photosensitive surface of the fingerprint sensor 3, so that the photosensitive surface of the fingerprint sensor 3 can generate a fingerprint A based on the incident light Image. The reverse prism structure 6 combines the light of the fingerprint light, so that the fission image passing through the prism structure 5 can be restored to form a complete fingerprint A image.

Optionally, in the above liquid crystal display fingerprint module, the prism angles of the prism structure 5 and the reverse prism structure 6 may be the same, or the difference of the prism angles is within a preset range. For example, the prism angles of the prism structure 5 and the reverse prism structure 6 may both be 90°, that is, both are right-angle prism angles.

Optionally, the prism structures 5 and the reverse prism structures 6 are aligned in parallel.

The prism structure 5 and the reverse prism structure 6 are aligned under the prism screen, which can make the reverse prism structure 6 recover the light separated by the prism structure 5 as much as possible through the light combining process, as much as possible to ensure the effective field of view of the fingerprint sensor, avoid The fission of fingerprint image is realized, and the restoration of fingerprint image is realized.

The liquid crystal display fingerprint module provided by the embodiment of the present application may include: a display module, a fingerprint light source and a fingerprint sensor; wherein, the display module includes a liquid crystal panel and a backlight module; the liquid crystal panel is located above the backlight module; the The fingerprint sensor is located below the backlight module; the backlight module includes: a prism structure, a light guide plate and a backlight; the side of the light guide plate is provided with the backlight; the prism structure is located on a side of the light guide plate facing the liquid crystal panel Side; there is a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor; the prism angle of the prism structure is opposite to that of the reverse prism structure; the light emitted by the fingerprint light source passes through the prism structure, the The light guide plate and the reverse prism structure are incident on the photosensitive surface of the fingerprint sensor. The liquid crystal display fingerprint module can be provided with a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor, and the fingerprint light after the prism structure is split by the reverse prism structure is combined to ensure the effectiveness of the fingerprint sensor The field of view also avoids fission of the fingerprint image, thereby ensuring the accuracy of the fingerprint recognition of the LCD.

In the liquid crystal display fingerprint module provided by the embodiment of the present application, the number of prism structures 5 may be multiple, and correspondingly, the number of reverse prism structures 6 may also be multiple. The number of prism structures 5 and reverse prism structures 6 may be the same. FIG. 3 is a second schematic diagram 2 of a stacked LCD fingerprint module provided by an embodiment of the present application. Based on the above-mentioned FIG. 1, the backlight module 13 further includes: a composite film 133. The composite film 133 is located on the side of the light guide plate 131 facing the liquid crystal panel 12.

The prism structure 5 includes: a first prism structure on the side of the composite film 133 facing the liquid crystal panel 12; the reverse prism structure 6 includes: a first reverse prism structure; the first prism structure and the first reverse prism The prism angle of the structure is opposite. It should be noted that the prism structure 5 shown in FIG. 3 is the first prism structure.

The first prism structure may be a prism structure independent of the composite film 133, that is, on the side of the composite film 133 facing the liquid crystal panel 12; the first prism structure may also be integrated on the composite film 133 as the composite film 133 facing the liquid crystal panel 12 Surface film layer.

The first reverse prism structure may be referred to as a reverse prism structure corresponding to the first prism structure.

Optionally, the size of the prism angle of the first prism structure and the first reverse prism structure may be the same, or the difference between the prism angles is within a preset range. For example, the prism angles of the five reverse prism structures 6 of the prism structure may all be 90°, that is, all are right-angle prism angles.

Optionally, the ridge lines of the first prism structure and the first reverse prism structure are aligned in parallel.

The first reverse prism structure included in the reverse prism structure 6 can recover the light separated by the first prism structure as much as possible through the light combining process, as much as possible to ensure the effective field of view of the fingerprint sensor, and avoid the fission of the fingerprint image.

3, optionally, the backlight module 13 further includes: a light enhancement film 134; the light enhancement film 134 is located between the composite film 133 and the light guide plate 131.

The prism structure further includes: a second prism structure, which is located on the side of the light-increasing film 134 facing the composite film 133; and the ridge line of the first prism structure is perpendicular to the ridge line of the second prism structure. It should be noted that the prism structure 5 shown in FIG. 3 takes the first prism structure as an example. For the second prism structure, since the ridge line of the second prism structure is perpendicular to the ridge line of the first prism structure, the The viewing angle is not shown yet.

The second prism structure may be a prism structure independent of the light enhancement film 134, that is, on the side of the light enhancement film 134 facing the liquid crystal panel 12; the second prism structure may also be integrated on the light enhancement film 134 as the light enhancement film 134 facing the liquid crystal panel 12 Surface film.

The reverse prism structure further includes: a second reverse prism structure; the direction of the prism angle of the second reverse prism structure is opposite to that of the second reverse prism structure. The ridge line of the first inverse prism structure is perpendicular to the ridge line of the second inverse prism structure.

The second reverse prism structure may be referred to as a reverse prism structure corresponding to the second prism structure.

Optionally, the prism angles of the second prism structure and the second reverse prism structure may be the same, or the difference of the prism angles is within a preset range. For example, the prism angles of the five reverse prism structures 6 of the prism structure may all be 90°, that is, all are right-angle prism angles.

Optionally, the ridge lines of the second prism structure and the second reverse prism structure are aligned in parallel.

The second reverse prism structure included in the reverse prism structure 6 can recover light separated by the second prism structure as much as possible through the light combining process, as much as possible to ensure the effective field of view of the fingerprint sensor, and avoid fission of the fingerprint image.

As shown above, the fingerprint light source 2 is an infrared light source. Using the infrared light source as the fingerprint light source 2 can prevent the visible light of the display screen from interfering with fingerprint detection and ensure the accuracy of fingerprint detection. In addition, the infrared light source is not visible and will not affect the display of the display screen, that is, the display effect of the display screen can be ensured while the accuracy of fingerprint detection is ensured.

The infrared light source may be, for example, an infrared LED light source, an infrared vertical cavity surface emitting laser (Vertical Cavity Surface Emitting Laser, VCSEL for short), an infrared laser diode (Laser Diode), or the like.

The backlight 132 is a visible light source, for example, a white LED light source.

Continuing to refer to FIG. 3 above, optionally, the backlight module further includes: a diffusion film 135; the diffusion film 135 is located between the light enhancement film 134 and the light guide plate 131.

The haze of the diffusion film 135 for infrared light is smaller than the haze of the diffusion film 135 for visible light. That is, the diffusion film 135 has a good light-transmitting effect on infrared light, so as to facilitate the transmission of fingerprint light, ensure the brightness of the fingerprint image, and ensure the accuracy of fingerprint recognition. The diffuser film 135 has a large haze to visible light, and also ensures the display of the liquid crystal panel.

With continued reference to FIG. 3 above, optionally, the backlight module 13 further includes: a reflective film 136. The reflective film 136 is located on the side of the light guide plate 131 facing away from the liquid crystal panel 12.

The transmittance of the reflective film 136 to infrared light is greater than the transmittance of the reflective film 136 to visible light, and the reflectance of the reflective film 136 to infrared light is less than the reflectance of the reflective film 136 to visible light.

In this embodiment, the reflective film 136 has a high transmittance of infrared light, that is, has a good light-transmitting effect, so as to facilitate the transmission of fingerprint light, ensure the brightness of the fingerprint image, and its reflectivity to infrared light is relatively high Low to prevent the fingerprint light from being reflected, ensuring the brightness of the fingerprint image. The reflective film 136 has a small transmittance of visible light and a high reflectivity to ensure the display of the liquid crystal panel and the display effect.

Optionally, the reverse prism structure 6 is located on the side of the reflective film 136 facing the photosensitive surface of the fingerprint sensor 3. The reverse prism structure 6 may be a prism structure independent of the reflective film 136, and is located on the side of the reflective film 136 facing the photosensitive surface of the fingerprint sensor 3; the reverse prism structure 6 may also be integrated on the reflective film 136 as a reflective film 136 through an integrated process of a chip The surface film layer facing the photosensitive surface of the fingerprint sensor 3.

FIG. 3 shows an example in which the reverse prism structure 6 is located on the side of the reflective film 136 facing the photosensitive surface of the fingerprint sensor 3.

In this embodiment, the reverse prism structure is disposed between the reflective film 136 and the photosensitive surface of the fingerprint sensor 3, which can not only ensure the optical characteristics of the backlight module, the display effect of the liquid crystal panel, but also ensure the effective viewing of the fingerprint sensor Field, it also avoids fission of fingerprint images, thus ensuring the accuracy of LCD fingerprint recognition.

3, optionally, the backlight module 13 further includes: a support plate 137; the support plate 137 is located on the side of the reflective film 136 facing away from the liquid crystal panel 12. The supporting plate 137 may be a steel plate for supporting the backlight module 13, the cover plate 11 and the liquid crystal panel 12.

The support plate 137 has a through hole 1371 within the field of view of the fingerprint sensor 3, for allowing the light emitted by the fingerprint light source 2 to pass through the through hole 1371 after being reflected.

In this embodiment, a through hole is formed in the support plate 137 so that the reflected fingerprint light can pass through, and then enter the photosensitive surface of the fingerprint sensor 3 to generate a fingerprint image for fingerprint recognition; avoid the support plate 137 pair The influence of fingerprint detection ensures effective fingerprint detection.

3, optionally, the liquid crystal display fingerprint module further includes: a filter 7; the filter 7 may be located between the backlight module 13 and the photosensitive surface of the fingerprint sensor 3.

In this embodiment, the filter 7 provided between the backlight module 13 and the photosensitive surface of the fingerprint sensor 3 can filter out visible light to avoid interference of the visible light of the backlight module 13 and the ambient visible light on fingerprint detection, ensuring Fingerprint detection accuracy.

In the liquid crystal display fingerprint module provided by the embodiment of the present application, the reverse prism structure 6 can be any position in the light guide plate 131 and the photosensitive surface of the fingerprint sensor 3. The above figures 1 and 3 are only one possible example. FIG. 4 is a schematic diagram 3 of a stack of an LCD fingerprint module provided by an embodiment of the present application. It should be noted that the difference between FIG. 4 and FIG. 1 is that the position of the reverse prism structure 6 is different, and only the differences will be described below. For the same or similarities, refer to the above, and will not be repeated here. For the liquid crystal display fingerprint module shown in FIG. 4, it may also have various stacks of the backlight module 13 shown in FIG. 3. For the specific structural location and effect description, please refer to the above, which will not be repeated here.

As shown in FIG. 4, the LCD fingerprint module further includes: a filter 7; the filter 7 is located between the backlight module 13 and the photosensitive surface of the fingerprint sensor 3.

The reverse prism structure 6 may be located on the side of the filter 7 facing the photosensitive surface of the fingerprint sensor 3.

The reverse prism structure 6 can be a prism structure independent of the filter 7 and is located on the side of the filter 7 facing the photosensitive surface of the fingerprint sensor 3; the reverse prism structure 6 can also be integrated on the filter 7 through an integrated process of the chip as The filter 7 faces the surface film layer of the photosensitive surface of the fingerprint sensor 3.

In this embodiment, the reverse prism structure 6 is provided on the side of the filter 7 facing the photosensitive surface of the fingerprint sensor 3, which can minimize the variation of the backlight module, ensure the optical characteristics of the backlight module, and ensure the display effect of the liquid crystal panel , It can also ensure the effective field of view of the fingerprint sensor, and also avoid the fission of the fingerprint image, thereby ensuring the accuracy of the LCD fingerprint recognition.

FIG. 5 is a schematic diagram 4 of a stacked LCD fingerprint module according to an embodiment of the present application. It should be pointed out that the difference between FIG. 5 and FIG. 1 is that the position of the reverse prism structure 6 is different, and only the differences will be described as follows. For the same or similarities, refer to the above, and will not be repeated here. For the liquid crystal display fingerprint module shown in FIG. 5, it may also have various stacks of the backlight module 13 shown in FIG. 3. For the specific structural position and effect description, please refer to the above, which will not be repeated here.

As shown in FIG. 5, the reverse prism structure 6 is located on the upper surface of the photosensitive surface of the fingerprint sensor 3.

The reverse prism structure 6 may be a prism structure independent of the fingerprint sensor 3 and located on the photosensitive surface of the fingerprint sensor 3; the reverse prism structure 6 may also be integrated on the photosensitive surface of the fingerprint sensor 3 through the chip integration process as the photosensitive surface of the fingerprint sensor 3 Surface film layer.

In this embodiment, the reverse prism structure 6 is provided on the upper surface of the photosensitive surface of the fingerprint sensor 3, which can minimize the variation of the backlight module, ensure the optical characteristics of the backlight module, ensure the display effect of the liquid crystal panel, and also ensure The effective field of view of the fingerprint sensor also avoids fission of the fingerprint image, thereby ensuring the accuracy of the fingerprint recognition of the LCD.

In the liquid crystal display fingerprint module provided by the embodiment of the present application, the fingerprint light source 2 can be set in any way, as long as the light emitted by the fingerprint light source 2 can be incident on the finger, and after being reflected by the finger, it can be incident on the light guide plate 131 The photosensitive surface of the fingerprint sensor 3 is sufficient.

The setting of the fingerprint light source 2 will be described as an example as follows.

In one way, the fingerprint light source 2 may be located under the cover 11 in the chin area of the electronic device. That is, the fingerprint light source 2 may be located at a vacant position on the side of the cover plate 11 facing the liquid crystal panel 12.

The fingerprint light source 2 can be attached to the surface of the vacant position of the side of the cover plate 11 facing the liquid crystal panel 12, that is, the lower surface, by optical glue in a flat or oblique manner.

The refractive index of the optical glue can be the same as that of the cover plate 11, or the difference between the refractive index of the optical glue and the cover plate 11 is within a preset range, which can reduce the light emitted by the fingerprint light source 2 under the cover plate 11. The proportion of the light reflected off the surface improves the utilization rate of the fingerprint light source 2, so that the light emitted by the fingerprint light source 2 can be irradiated to the finger as much as possible to realize fingerprint recognition and ensure the accuracy of fingerprint recognition.

The above Figures 1 and 3 to 5 show the flat affixing method of the fingerprint light source 2. Referring to any one of Figures 1 and 3 to 5, the fingerprint light source 2 can pass the optical glue 4 to the cover plate in a flat affixing manner. 11 The lower surface of the vacant position on the top is attached, and the light emitting surface of the fingerprint light source 2 may be parallel to the lower surface of the cover plate 11. Adopting the flat bonding method to fit the fingerprint light source 2 makes the assembly more convenient, and can make the structural tolerance of the liquid crystal display fingerprint module better controlled.

FIG. 6 is a schematic diagram 5 of a stack of an LCD fingerprint module provided by an embodiment of the present application. FIG. 6 shows the oblique sticking method of the fingerprint light source 2. Referring to FIG. 6, the fingerprint light source 2 may be attached to the lower surface of the cover plate 11 at the vacant position in an oblique manner through the optical glue 4, so that there is a predetermined included angle between the light emitting surface of the fingerprint light source 2 and the cover plate 11. Adopting the oblique sticking method to attach the fingerprint light source 2 and the cover plate 11 can make the light emitted by the fingerprint light source 2 exit the cover plate 11 at a predetermined angle to prevent the light from exiting in a direction away from the fingerprint sensor 3, which improves the light Utilization.

It should be noted that the position of the reverse prism structure 6 in the LCD fingerprint module in FIG. 6 is only an example, and the position of the reverse prism structure 6 may also be any of the positions described in FIGS. 3 to 5 above. The above is not repeated here.

In another way, the fingerprint light source 2 can also be located at the side end of the light guide plate 131. Since the backlight 132 is also located at the side end of the light guide body 1311, in this example, the fingerprint light source 2 can emit light to the finger through the light guide plate 131 for fingerprint recognition.

7 is a positional relationship diagram of a backlight source, a fingerprint light source, and a light guide plate adopted by an embodiment of the present application. As shown in FIG. 7, in this embodiment, the fingerprint light source 2 may also be disposed on the side end of the light guide plate 131, and the fingerprint light source 2 and the backlight 132 may be evenly distributed on the side end of the light guide body 1311 so that the fingerprint light source 2 The light can be incident on the finger by the light guide of the light guide plate 131. For example, a fingerprint light source 2 is provided at the symmetrical position of the side end of the light guide plate 131, which can ensure the fingerprint detection effect when the finger is pressed at different angles on the LCD screen.

Regardless of whether the fingerprint light source 2 is located below the cover plate 11 or the side end of the light guide body 1311, in order to ensure the fingerprint detection effect when the finger is pressed at different angles on the LCD screen, the embodiments of the present application also provide a variety of layouts of the fingerprint light source 2 Example, so that the fingerprint light source 2 can be symmetrically distributed. The fingerprint light source 2 may be a plurality of independent light sources, and may also be a ribbon light source composed of a plurality of light sources.

FIG. 8 is a first schematic layout diagram of a fingerprint module in an electronic device with a liquid crystal display fingerprint module adopted by an embodiment of the present application. If two independent fingerprint light sources 2 are provided, as shown in FIG. 8, the two fingerprint light sources 2 may be respectively located in vacant positions on the side of the cover plate 11 facing the liquid crystal panel 12, with two positions centered on the positions corresponding to the fingerprint sensor 3 Symmetrical position.

9 is a second schematic layout diagram of a fingerprint module in an electronic device with a liquid crystal display fingerprint module adopted by an embodiment of the present application. If three independent fingerprint light sources 2 are provided, as shown in FIG. 9, one fingerprint light source 2 may be located in a vacant position on the side of the cover plate 11 facing the liquid crystal panel 12, corresponding to the fingerprint sensor 3; the other two fingerprint light sources 2 can be located in two symmetrical positions centered on the position corresponding to the fingerprint sensor 3 in the vacant position on the side of the cover plate 11 facing the liquid crystal panel 12, respectively.

10 is a schematic diagram 3 of a layout of a fingerprint module in an electronic device with a liquid crystal display fingerprint module adopted by an embodiment of the present application. If four independent fingerprint light sources 2 are provided, as shown in FIG. 10, the four fingerprint light sources 2 may be respectively located in vacant positions on the side of the cover plate 11 facing the liquid crystal panel 12, with four positions centered on the position corresponding to the fingerprint sensor 3 Symmetrical position.

11 is a schematic diagram 4 of a layout of a fingerprint module in an electronic device with a liquid crystal display fingerprint module adopted by an embodiment of the present application. If a band-shaped fingerprint light source 2 composed of multiple light sources is provided, as shown in FIG. 11, the band-shaped fingerprint light source 2 may be located in a vacant position on the side of the cover plate 11 facing the liquid crystal panel 12. The center may be the position corresponding to the fingerprint sensor 3.

It should be noted that in this embodiment, the number of fingerprint light sources 2 can also be increased to increase the amount of fingerprint detection signal and the accuracy of fingerprint detection.

An embodiment of the present application may also provide an electronic device having the above-mentioned liquid crystal display fingerprint module. 12 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in FIG. 12, the electronic device may include a housing 1201 and a liquid crystal display fingerprint module 1202. The LCD fingerprint module 1202 is located in the housing 1201.

The liquid crystal display fingerprint module 1202 may be any of the liquid crystal display fingerprint modules shown in any of FIGS. 1 to 11 described above.

The electronic device may include any of the liquid crystal display fingerprint modules described above. Since the liquid crystal display fingerprint module ensures an effective field of view of the fingerprint sensor, and also avoids fission of the fingerprint image, the electronic device can realize the under-screen optics of the LCD Fingerprints ensure the accuracy of LCD fingerprint recognition.

The embodiment of the present application also provides an under-screen fingerprint recognition system, which can be applied to the under-liquid crystal display module with a backlight module for under-screen optical fingerprint detection. The fingerprint identification system under the screen includes fingerprint light source and fingerprint sensor;

The fingerprint light source is used to provide light for fingerprint detection, the fingerprint sensor is used to detect a fingerprint image of a finger pressed above the liquid crystal display module, and the field of view of the fingerprint sensor is located in the display area of the liquid crystal display module;

Wherein, the liquid crystal display module includes a liquid crystal panel and a backlight module provided on the back of the liquid crystal panel, the backlight module includes: a prism structure, a light guide plate and a backlight source; the side end of the light guide plate is provided with the backlight source; The prism structure is located on the side of the light guide plate facing the liquid crystal panel; there is a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor; the prism angle of the prism structure is opposite to that of the reverse prism structure;

The light emitted by the fingerprint light source is reflected to the photosensitive surface of the fingerprint sensor through the prism film, the light guide plate and the reverse prism structure in turn.

In a possible implementation manner, the backlight module further includes: a composite film; the composite film is located on a side of the light guide plate facing the liquid crystal panel; the prism structure includes: a first prism structure, and the first prism structure is located on the The composite film faces the side of the liquid crystal panel;

The reverse prism structure includes: a first reverse prism structure; the direction of the prism angle of the first reverse prism structure is opposite to that of the first reverse prism structure.

In another possible implementation manner, the backlight module further includes: a light-enhancing film; the light-enhancing film is located between the composite film and the light guide plate;

The prism structure further includes: a second prism structure, the second prism structure is located on a side of the brightness enhancement film facing the composite film; the ridge line of the first prism structure is perpendicular to the ridge line of the second prism structure;

The reverse prism structure further includes: a second reverse prism structure; the direction of the prism angle of the second reverse prism structure is opposite to that of the second reverse prism structure.

In yet another realizable manner, the fingerprint light source is an infrared light source; the backlight source is a visible light source.

The backlight module further includes: a diffusion film; the diffusion film is located between the light enhancement film and the light guide plate;

The haze of the diffusion film for infrared light is smaller than the haze of the diffusion film for visible light.

In yet another realizable manner, the fingerprint light source is an infrared light source; the backlight source is a visible light source;

The backlight module also includes: a reflective film on the side of the light guide plate facing away from the liquid crystal panel;

The transmittance of the reflective film to infrared light is greater than the transmittance of the reflective film to visible light, and the reflectivity of the reflective film to infrared light is less than the reflectivity of the reflective film to visible light.

In yet another possible implementation, the reverse prism structure is located on the side of the reflective film facing the photosensitive surface of the fingerprint sensor.

In still another possible implementation manner, the backlight module further includes: a support plate; the support plate is located on a side of the reflective film facing away from the liquid crystal panel;

The support plate has a through hole in the field of view of the fingerprint sensor, so that the light emitted by the fingerprint light source passes through the through hole after being reflected.

In yet another realizable manner, the under-screen fingerprint recognition system further includes: a filter; the filter is located between the backlight module and the photosensitive surface of the fingerprint sensor.

In yet another realizable manner, the reverse prism structure is located on the side of the filter facing the photosensitive surface of the fingerprint sensor.

In yet another realizable manner, the reverse prism structure is located on the upper surface of the photosensitive surface of the fingerprint sensor.

In still another possible implementation manner, the liquid crystal display module further includes a cover plate, and the cover plate is located above the liquid crystal panel;

Wherein, the fingerprint light source is attached to the lower surface of the cover plate at the vacant position by flat bonding, so that the light emitting surface of the fingerprint light source is parallel to the lower surface of the cover plate; or,

The fingerprint light source is adhered to the lower surface of the vacant position on the cover plate by obliquely attaching, so that there is a preset angle between the light exit surface of the fingerprint light source and the lower surface of the cover plate.

The under-screen fingerprint recognition system provided by the embodiment of the present application can be provided with a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor, and the fingerprint light after the prism structure is split by the reverse prism structure is combined with light. The effective field of view of the fingerprint sensor is ensured, and the fission of the fingerprint image is also avoided, thereby ensuring the accuracy of the LCD fingerprint recognition.

Persons of ordinary skill in the art may understand that all or part of the steps to implement the above method embodiments may be completed by program instructions related hardware. The foregoing program may be stored in a computer-readable storage medium. When the program is executed, the program is executed The steps of the above method embodiments are included; and the foregoing storage media include various media that can store program codes, such as ROM, RAM, magnetic disks, or optical disks.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or replacements do not deviate from the essence of the corresponding technical solutions of the technical solutions of the embodiments of the present application. range.

Claims

A liquid crystal display fingerprint module, characterized by comprising: a display module, a fingerprint light source and a fingerprint sensor; wherein, the display module includes a liquid crystal panel and a backlight module;

The liquid crystal panel is located above the backlight module; the fingerprint sensor is located below the backlight module; the backlight module includes: a prism structure, a light guide plate and a backlight; the side ends of the light guide plate are provided with The backlight; the prism structure is located on the side of the light guide plate facing the liquid crystal panel; there is a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor; the prism structure and the reverse The direction of the prism angle of the prism structure is opposite;

After being reflected, the light emitted by the fingerprint light source enters the photosensitive surface of the fingerprint sensor through the prism structure, the light guide plate, and the reverse prism structure in sequence.
The liquid crystal display fingerprint module according to claim 1, wherein the backlight module includes: a composite film; the composite film is located on a side of the light guide plate facing the liquid crystal panel; and the prism structure includes : A first prism structure, the first prism structure is located on the side of the composite film facing the liquid crystal panel;

The reverse prism structure includes: a first reverse prism structure; the direction of the prism angle of the first reverse prism structure is opposite to that of the first reverse prism structure.
The liquid crystal display fingerprint module according to claim 2, wherein the backlight module further comprises: a light enhancement film; the light enhancement film is located between the composite film and the light guide plate;

The prism structure further includes: a second prism structure, the second prism structure is located on a side of the brightness enhancement film facing the composite film; the prism line of the first prism structure and the prism of the second prism structure Line vertical

The reverse prism structure further includes: a second reverse prism structure; the direction of the prism angle of the second reverse prism structure is opposite to that of the second reverse prism structure.
The liquid crystal display fingerprint module according to claim 3, wherein the fingerprint light source is an infrared light source; the backlight source is a visible light source;

The backlight module further includes: a diffusion film; the diffusion film is located between the light enhancement film and the light guide plate;

The haze of the diffusion film to infrared light is smaller than the haze of the diffusion film to visible light.
The liquid crystal display fingerprint module according to claim 1, wherein the fingerprint light source is an infrared light source; the backlight source is a visible light source; the backlight module further includes: a reflective film, the reflective film is located on the A side of the light guide plate facing away from the liquid crystal panel;

The transmittance of the reflective film to infrared light is greater than the transmittance of the reflective film to visible light, and the reflectance of the reflective film to infrared light is less than the reflectance of the reflective film to visible light.
The liquid crystal display fingerprint module according to claim 5, wherein the reverse prism structure is located on a side of the reflective film facing the photosensitive surface of the fingerprint sensor.
The liquid crystal display fingerprint module according to claim 5, wherein the backlight module further comprises: a support plate; the support plate is located on a side of the reflective film facing away from the liquid crystal panel;

The support plate has a through hole in the field of view of the fingerprint sensor, so that the light emitted by the fingerprint light source passes through the through hole after being reflected.
The liquid crystal display fingerprint module according to claim 1, wherein the liquid crystal display fingerprint module further comprises: a filter; the filter is located on the photosensitive surface of the backlight module and the fingerprint sensor between.
The liquid crystal display fingerprint module according to claim 8, wherein the reverse prism structure is located on a side of the filter facing the photosensitive surface of the fingerprint sensor.
The liquid crystal display fingerprint module according to any one of claims 1-5, 7, and 8, wherein the reverse prism structure is located on the upper surface of the photosensitive surface of the fingerprint sensor.
The liquid crystal display fingerprint module according to any one of claims 1-9, wherein the display module further includes a cover plate, the cover plate is located above the liquid crystal panel; the fingerprint light source is located The cover plate faces a vacant position on one side of the liquid crystal panel.
The liquid crystal display fingerprint module according to claim 11, wherein the fingerprint light source is attached to the lower surface of the vacant position on the cover plate by a flat bonding method, so that the light emitting surface of the fingerprint light source Parallel to the lower surface of the cover plate.
The liquid crystal display fingerprint module according to claim 11, wherein the fingerprint light source is attached to the lower surface of the vacant position on the cover plate by an oblique bonding method, so that the light emitting surface of the fingerprint light source There is a preset angle with the lower surface of the cover plate.
The liquid crystal display fingerprint module according to any one of claims 1-9, wherein the fingerprint light source is located at a side end of the light guide plate.
An under-screen fingerprint identification system is suitable for under-screen optical fingerprint detection under a liquid crystal display module with a backlight module, characterized in that the under-screen fingerprint identification system includes a fingerprint light source and a fingerprint sensor;

The fingerprint light source is used to provide light for fingerprint detection, the fingerprint sensor is used to detect a fingerprint image of a finger pressed above the liquid crystal display module, and the field of view of the fingerprint sensor is located in the liquid crystal display module Display area

Wherein, the liquid crystal display module includes a liquid crystal panel and a backlight module provided on the back of the liquid crystal panel, the backlight module includes: a prism structure, a light guide plate and a backlight; the side ends of the light guide plate are provided with The backlight; the prism structure is located on the side of the light guide plate facing the liquid crystal panel; there is a reverse prism structure between the light guide plate and the photosensitive surface of the fingerprint sensor; the prism structure and the reverse prism The direction of the prism angle of the structure is opposite;

After being reflected, the light emitted by the fingerprint light source enters the photosensitive surface of the fingerprint sensor through the prism film, the light guide plate, and the reverse prism structure in sequence.
The under-screen fingerprint recognition system according to claim 15, wherein the backlight module further comprises: a composite film; the composite film is located on a side of the light guide plate facing the liquid crystal panel; the prism structure The method includes: a first prism structure, the first prism structure is located on a side of the composite film facing the liquid crystal panel;

The reverse prism structure includes: a first reverse prism structure; the direction of the prism angle of the first reverse prism structure is opposite to that of the first reverse prism structure.
The under-screen fingerprint recognition system of claim 16, wherein the backlight module further comprises: a light-enhancing film; the light-enhancing film is located between the composite film and the light guide plate;

The prism structure further includes: a second prism structure, the second prism structure is located on a side of the brightness enhancement film facing the composite film; the prism line of the first prism structure and the prism of the second prism structure Line vertical

The reverse prism structure further includes: a second reverse prism structure; the direction of the prism angle of the second reverse prism structure is opposite to that of the second reverse prism structure.
The under-screen fingerprint identification system according to claim 17, wherein the fingerprint light source is an infrared light source; the backlight source is a visible light source;

The backlight module further includes: a diffusion film; the diffusion film is located between the light enhancement film and the light guide plate;

The haze of the diffusion film to infrared light is smaller than the haze of the diffusion film to visible light.
The under-screen fingerprint identification system according to claim 15, wherein the fingerprint light source is an infrared light source; the backlight source is a visible light source;

The backlight module further includes: a reflective film on the side of the light guide plate facing away from the liquid crystal panel;

The transmittance of the reflective film to infrared light is greater than the transmittance of the reflective film to visible light, and the reflectance of the reflective film to infrared light is less than the reflectance of the reflective film to visible light.
The under-screen fingerprint identification system of claim 19, wherein the reverse prism structure is located on a side of the reflective film facing the photosensitive surface of the fingerprint sensor.
The under-screen fingerprint recognition system of claim 19, wherein the backlight module further comprises: a support plate; the support plate is located on a side of the reflective film facing away from the liquid crystal panel;

The support plate has a through hole in the field of view of the fingerprint sensor, so that the light emitted by the fingerprint light source passes through the through hole after being reflected.
The under-screen fingerprint identification system according to claim 15, wherein the under-screen fingerprint identification system further comprises: a filter; the filter is located on the photosensitive surface of the backlight module and the fingerprint sensor between.
The under-screen fingerprint identification system according to claim 22, wherein the reverse prism structure is located on a side of the filter facing the photosensitive surface of the fingerprint sensor.
The under-screen fingerprint identification system according to any one of claims 15-19, 21, 22, wherein the reverse prism structure is located on the upper surface of the photosensitive surface of the fingerprint sensor.
The under-screen fingerprint recognition system according to any one of claims 15 to 21, wherein the liquid crystal display module further includes a cover plate, the cover plate is located above the liquid crystal panel;

Wherein, the fingerprint light source is attached to the lower surface of the vacant position on the cover plate by flat bonding, so that the light exit surface of the fingerprint light source is parallel to the lower surface of the cover plate; or,

The fingerprint light source is adhered to the lower surface of the cover plate at the vacant position in an obliquely pasting manner, so that a predetermined included angle exists between the light emitting surface of the fingerprint light source and the lower surface of the cover plate.
The under-screen fingerprint recognition system according to any one of claims 15-21, wherein the fingerprint light source is located at a side end of the light guide plate.
An electronic device, characterized by comprising: the liquid crystal display fingerprint module according to any one of claims 1-14 above.