CN211826824U - Backlight module for face recognition - Google Patents
Backlight module for face recognition Download PDFInfo
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- CN211826824U CN211826824U CN202020173037.5U CN202020173037U CN211826824U CN 211826824 U CN211826824 U CN 211826824U CN 202020173037 U CN202020173037 U CN 202020173037U CN 211826824 U CN211826824 U CN 211826824U
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- face recognition
- backlight module
- infrared transparent
- recognition device
- infrared
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Abstract
The utility model discloses a backlight unit for people's face, it is including setting up the face identification device of reflector plate below, and face identification device top still is provided with infrared transparent reflectance coating. The infrared light can penetrate through the infrared transparent reflection film and the through hole in the reflection sheet, and meanwhile, part of visible light penetrating through the infrared transparent reflection film is reflected by the reflection sheet, or part of visible light penetrating through the reflection sheet is reflected by the infrared transparent reflection film, so that the light emitting efficiency of the visible light is improved.
Description
Technical Field
The utility model relates to the field of communication technology, especially, relate to a backlight unit that is used for face discernment in LCD screen.
Background
Face sensing and matching is a reliable and widely used technique. A common method of face recognition involves scanning a sample face or an image thereof and storing the image and/or unique features of the face target, which can be compared with information of reference faces already present in a database to determine the correct recognition of the user, for example for authentication purposes. In particular, in-display (in-display) face recognition is now becoming increasingly popular due to its ease of operation and versatility and its suitability for compact portable electronic devices.
Face identification display device obviously has bigger use scene scope and better cost advantage than face identification display device in the OLED screen in the LCD screen, but, face identification display device is not yet fully ripe in the screen based on LCD display, especially can't compromise effective penetration and the accurate collection of face identification signal on the LCD module.
In the in-screen face recognition display device of the LCD display, as shown in fig. 1, a target object on a glass cover plate 140 on the LCD display screen is recognized by scanning; however, the optical signal for recognizing the human face at least passes through the LCD panel and the glass cover plate 140, and the LCD panel is composed of the LCD module 130 and the backlight module 120, and the glass cover plate 140 has a certain thickness. Therefore, the optical signal is severely refracted and scattered, or even totally reflected, during the process of transmitting through the LCD module, the backlight module and the glass cover plate. In addition, when the face recognition unit 110 is disposed above the backlight module, from the viewing angle of the display screen, the transmittance of the display area below which the face recognition unit is disposed is lower than that of the other display areas without the face recognition unit, the LED backlight source at the bottom provides a uniform planar light source, the display area below which the face recognition unit is disposed is darker than the other areas, and the display area of the liquid crystal display device is non-uniform.
Therefore, the realization of in-screen human face recognition based on LCD displays requires an improvement in the overall design of the backlight module.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a backlight unit for face identification in LCD screen, can make face identification signal effectively pierce through and the accurate collection on backlight unit, keeps LCD display screen's demonstration luminance even simultaneously.
In order to solve the technical problem, the utility model discloses a technical scheme be: the backlight module comprises a light source, a light guide plate arranged on one side of the light source, a reflector plate arranged below the light guide plate, an optical diaphragm arranged above the light guide plate, a face recognition device arranged below the reflector plate, and an infrared transparent reflective film arranged above the face recognition device. The infrared transparent reflecting film contains visible light reflecting particles, so that visible light is reflected on the infrared transparent reflecting film, and meanwhile, infrared light can penetrate through the infrared transparent reflecting film. The infrared light can penetrate through the infrared transparent reflection film and the through hole in the reflection sheet, and meanwhile, part of visible light penetrating through the infrared transparent reflection film is reflected by the reflection sheet, or part of visible light penetrating through the reflection sheet is reflected by the infrared transparent reflection film, so that the light emitting efficiency of the visible light is improved.
The utility model discloses a backlight unit has adopted the reflector plate to add the double reflection layer structure that infrared transparent reflective membrane is constituteed, can not only see through infrared transparent reflective membrane and backlight unit with high transmittance with the infrared light signal of detection object, is gathered effectively by the beneath optical sensor accuracy of LCD screen at last, and then realizes the in-screen face recognition function discernment of LCD display, realizes accurate discernment and verification to face information. The utility model discloses a backlight module just guarantees luminance and the homogeneity of module demonstration, reduce cost. In addition, the backlight module can also accurately transmit and propagate the infrared optical signal to the detected object for detection.
The infrared transparent reflection film contains visible light reflection particles, and the visible light reflection particles comprise at least one of Ag, Al, Ni and Au. The infrared transparent reflecting film is arranged between the reflecting sheet and the light guide plate or between the reflecting sheet and the face recognition device. The through holes on the reflector are continuous through holes and/or discontinuous through holes, and the positions of the through holes correspond to the positions of the face recognition device.
The reflector plate is a visible light reflector plate, can be a commercial silver reflector plate or a commercial white light reflector plate, reflects visible light and infrared light, and has a reflectivity of more than 80%. The reflecting sheet is provided with a continuous through hole or a discontinuous through hole, and the through hole is arranged corresponding to the directions of light emitting and receiving of the face recognition device, so that infrared light is partially collected by the face recognition device after penetrating through the reflecting sheet and the infrared transparent reflecting film.
Preferably, the backlight module further comprises an optical sensor element for emitting and/or receiving the optical signal of the human face; the human face optical signal is infrared light.
Preferably, the backlight module further comprises an iron frame, and the face recognition device is arranged between the iron frame and the infrared transparent reflection film; or the face recognition device is embedded in the through hole of the iron frame; or the face recognition device is arranged below the iron frame, and the iron frame is provided with a through hole or is not provided with a through hole.
Preferably, the optical film further includes a diffusion film and a prism sheet. The prism sheet is disposed above the infrared transparent reflective film. The diffusion sheet is disposed between the infrared transparent reflective film and the prism sheet.
According to the utility model discloses an embodiment, the utility model discloses a backlight unit integrates into an electronic equipment with LCD panel, glass apron and touch screen module, and it can be applied to LCD display and the electron device who is used for face identification. The utility model discloses a backlight unit of double reflection layer structure is applied to face identification's electron device, can realize the accurate discernment and the verification to face information.
Drawings
The invention and its advantages will be better understood by studying the following non-limiting examples, and by studying the detailed description of specific embodiments shown in the appended drawings, in which:
fig. 1 is an in-screen human face recognition display device of a prior art LCD display.
Fig. 2 is an exploded view of the backlight module according to embodiment 1 of the present invention.
Fig. 3 is a structural view of the infrared transparent reflective film according to embodiment 1 of the present invention.
Fig. 4 is an exploded view of the backlight module according to embodiment 2 of the present invention.
Fig. 5 is an exploded view of the backlight module according to embodiment 3 of the present invention.
Fig. 6 is an exploded view of the backlight module according to embodiment 4 of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
The following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], refer to the directions of the attached drawings only. The directional or positional relationships indicated are those shown in the drawings for convenience of description and simplicity of description, and are not intended to indicate or imply that the device or element so indicated must have a particular orientation, configuration and operation in a particular orientation, and is therefore not to be construed as limiting the invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Example 1
First, a backlight module according to embodiment 1 of the present invention will be described with reference to fig. 2 and 3. According to the backlight module of embodiment 1 of the present invention, as shown in fig. 2, the backlight module includes a light source 231, a light guide plate 230 disposed on one side of the light source 231, an optical film 240 disposed above the light guide plate 230, an infrared transparent reflective film 220 disposed below the light guide plate 230, a visible light reflective sheet 210 disposed below the infrared transparent reflective film 220, and a face recognition device 103 disposed below the visible light reflective sheet 210 for recognizing a face optical signal; the reflecting sheet 210 is provided with a continuous through hole 2101, the infrared transparent reflecting film 220 reflects visible light, and the position of the through hole 2101 corresponds to the position of the face recognition device 103, so that infrared light is partially collected by the face recognition device 103 after passing through the infrared transparent reflecting film 220 and the reflecting sheet 210.
As shown in a sectional structure diagram of the infrared transparent reflective film 220 in fig. 3, the visible light reflective particles enable most of visible light to be reflected (with a reflectivity of more than 80%) on the infrared transparent reflective film 220, meanwhile, infrared light can penetrate through the infrared transparent reflective film 220 and the through holes 2101 on the reflective sheet 210, and visible light partially penetrating through the infrared transparent reflective film 220 is reflected (with a reflectivity of more than 90%) by the reflective sheet 210, so that the light extraction efficiency of the visible light is improved. The infrared transparent reflective film 220 can reflect visible light emitted from the light guide plate with a high reflectance and transmit infrared light with a high transmittance. The backlight module of this embodiment can not only see through infrared transparent reflective film and backlight module with the infrared light signal of detection object with high transmissivity, is gathered by the infrared optical sensor below the LCD screen is accurate effectively at last, and then realizes the in-screen face recognition function of LCD display and discerns, realizes accurate discernment and verification to people's face optical information. The utility model discloses a backlight module just guarantees luminance and the homogeneity of module demonstration, reduce cost. In addition, the backlight module can also accurately transmit and propagate the infrared optical signal to the detected object for detection.
One end of the light guide plate 230 is connected to one end of the light source 231, the light source 231 provides a light source for the backlight module, light emitted from the light source 231 is emitted after being processed by the light guide plate 230, and the light emitted from the light guide plate 230 is transmitted to the infrared transparent reflective film 220 to generate directional reflected light, so that the infrared transparent reflective film 220 realizes the function of uniform reflection of visible light. And the infrared light is not substantially absorbed or scattered by the visible light reflecting particles and thus can substantially vertically transmit through the infrared transparent reflective film 220.
The backlight module also comprises an optical sensor element for transmitting and receiving the optical signal of the human face; the optical signal of the human face is infrared light.
The backlight module of this embodiment is provided with an optical film 240 including a diffusion sheet and a prism sheet. The optical film 240 can further optimize the light extraction effect of the backlight.
Example 2
Fig. 4 is an exploded view of the backlight module according to embodiment 2 of the present invention. Only the differences between embodiment 2 and embodiment 1 will be described below, and the descriptions of the similarities will be omitted. The visible light reflecting sheet 210 is disposed between the light guide plate 230 and the infrared transparent reflective film 220.
Example 3
Fig. 5 is an exploded view of the backlight module according to embodiment 3 of the present invention. Only the differences between embodiment 3 and embodiment 1 will be described below, and the descriptions of the similarities will be omitted. The reflector plate is provided with two: the visible light reflecting sheet 250 and the visible light reflecting sheet 210 are respectively disposed above and below the infrared transparent reflective film 220, and are respectively provided with a discontinuous array of through holes 2501 and an array of through holes 2101.
Example 4
Fig. 6 is an exploded view of the basic backlight module according to embodiment 4 of the present invention. Only the differences between embodiment 2 and embodiment 4 will be described below, and the descriptions of the similarities are omitted here. The visible light reflecting sheet 210 is disposed between the light guide plate 230 and the infrared transparent reflective film 220. An iron frame 101 is arranged below the infrared transparent reflective film 220, and the face recognition device 103 is arranged between the iron frame 101 and the infrared transparent reflective film 220.
While the invention has been described above with reference to certain embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, as long as there is no structural conflict, the various features of the various embodiments disclosed herein can be used in any combination with one another, and the description of such combinations is not exhaustive for reasons of brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (7)
1. The utility model provides a backlight unit for face identification which characterized in that includes:
the light guide plate is arranged on one side of the light source;
the face recognition device comprises a reflector plate arranged below the light guide plate, an optical diaphragm arranged above the light guide plate, a face recognition device arranged below the reflector plate, and an infrared transparent reflection film arranged above the face recognition device;
the reflecting sheet is provided with a through hole, and the infrared transparent reflecting film reflects visible light, so that infrared light is collected by the face recognition device after penetrating through the reflecting sheet and the infrared transparent reflecting film.
2. The backlight module for face recognition according to claim 1, wherein: the infrared transparent reflection film is arranged between the reflection sheet and the light guide plate.
3. The backlight module for face recognition according to claim 1, wherein: the infrared transparent reflecting film is arranged between the reflecting sheet and the face recognition device.
4. The backlight module for face recognition according to claim 1, wherein: the through holes are continuous through holes and/or discontinuous through holes, and the positions of the through holes correspond to the positions of the face recognition device.
5. The backlight module for face recognition according to claim 1, wherein: the optical film includes a diffusion film and a prism sheet.
6. The backlight module for face recognition according to claim 1, wherein: the face recognition module comprises an optical sensor element for transmitting and/or receiving a face optical signal; the human face optical signal is infrared light.
7. The backlight module for face recognition according to claim 1, wherein: the backlight module also comprises an iron frame, and the face recognition device is arranged between the iron frame and the infrared transparent reflection film; or the face recognition device is embedded in the through hole of the iron frame; or the face recognition device is arranged below the iron frame.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020173037.5U CN211826824U (en) | 2020-02-13 | 2020-02-13 | Backlight module for face recognition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020173037.5U CN211826824U (en) | 2020-02-13 | 2020-02-13 | Backlight module for face recognition |
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| Publication Number | Publication Date |
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| CN211826824U true CN211826824U (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020173037.5U Active CN211826824U (en) | 2020-02-13 | 2020-02-13 | Backlight module for face recognition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114660696A (en) * | 2020-12-22 | 2022-06-24 | 宁波激智科技股份有限公司 | Light guide plate with infrared ray transmitting and visible light reflecting functions and backlight module |
-
2020
- 2020-02-13 CN CN202020173037.5U patent/CN211826824U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114660696A (en) * | 2020-12-22 | 2022-06-24 | 宁波激智科技股份有限公司 | Light guide plate with infrared ray transmitting and visible light reflecting functions and backlight module |
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