CN111123580A - Backlight device for fingerprint identification and electronic equipment - Google Patents
Backlight device for fingerprint identification and electronic equipment Download PDFInfo
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- CN111123580A CN111123580A CN201911307587.XA CN201911307587A CN111123580A CN 111123580 A CN111123580 A CN 111123580A CN 201911307587 A CN201911307587 A CN 201911307587A CN 111123580 A CN111123580 A CN 111123580A
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- fingerprint identification
- identification device
- backlight device
- infrared
- backlight
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention discloses a backlight device for identifying fingerprints under a screen and electronic equipment. The backlight device comprises a light source and a light guide plate arranged on one side of the light source; the fingerprint identification device comprises a reflector plate arranged below the light guide plate, an optical film arranged above the light guide plate and a fingerprint identification device arranged below the reflector plate. The infrared transparent reflecting film is arranged on the reflecting sheet, corresponds to the fingerprint identification device in position, reflects visible light and transmits infrared light, so that the infrared light is collected by the fingerprint identification device after transmitting the infrared transparent reflecting film.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a backlight device for fingerprint identification in an LCD screen and electronic equipment.
Background
Fingerprint sensing and matching is a reliable and widely used technique. A common method of fingerprint identification involves scanning a sample fingerprint or an image thereof and storing the image and/or unique features of the fingerprint image, which can be compared with information of reference fingerprints already present in a database to determine the correct identification of the user, e.g. for authentication purposes. In particular, in-display (in-display) fingerprinting is now becoming increasingly popular due to its ease of operation and versatility and its suitability for compact portable electronic devices.
Fingerprint identification display device obviously has bigger use scene scope and better cost advantage than fingerprint identification display device in the OLED screen in the LCD screen, but, fingerprint identification display device is not yet completely ripe in the screen based on LCD display, especially can not compromise effective penetration and the accurate collection of fingerprint identification signal on the LCD module.
In the in-screen fingerprint recognition display device of the LCD display, as shown in fig. 1, by recognizing a fingerprint pressed on a glass cover plate 104 covering the LCD display screen; however, the optical signal for identifying the fingerprint at least passes through the LCD panel and the glass cover plate 104, and since the LCD panel is composed of the LCD module 102 and the backlight device 101, the glass cover plate 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 device and the glass cover plate. In addition, when the fingerprint recognition unit 103 is placed above the backlight device, from the viewing angle of the display screen, the transmittance of the display area below which the fingerprint recognition unit is disposed is lower than that of the other display areas where the fingerprint recognition unit is not disposed, while the LED backlight source at the bottom provides a uniform planar light source, the display area below which the fingerprint recognition unit is disposed is darker than the other areas, and the display area of the liquid crystal display device is not uniform in brightness.
Accordingly, improvements in the overall design of backlight devices are needed based on the implementation of in-screen fingerprint identification for LCD displays.
Disclosure of Invention
The technical problem mainly solved by the invention is to provide the backlight device and the electronic equipment for fingerprint identification in the LCD screen, so that a fingerprint identification signal can effectively penetrate through the fingerprint identification terminal equipment and can be accurately collected by the fingerprint identification device, and the display picture quality of the LCD screen is not influenced.
In order to solve the above technical problems, one technical solution adopted by the present invention is a backlight device, which includes a light source and a light guide plate disposed at one side of the light source; the fingerprint identification device comprises a reflector plate arranged below the light guide plate, an optical film arranged above the light guide plate, and a fingerprint identification device arranged below the reflector plate. The infrared transparent reflection film is arranged on the reflection sheet, corresponds to the fingerprint identification device in position, reflects visible light and transmits infrared light, so that the infrared light is collected by the fingerprint identification device after transmitting the infrared transparent reflection film.
According to the backlight device, the infrared signal carrying the biological fingerprint information effectively penetrates through the infrared transparent reflecting film and is accurately and effectively collected by the fingerprint identification sensor, and meanwhile, the brightness and the uniformity of the visible light source of the backlight device are kept.
In a preferred embodiment, the reflective sheet contains visible light reflective particles of at least one of Ag, Al, Ni, Au. The visible light reflectivity of the infrared transparent reflection film is not higher than that of other areas on the reflection sheet.
Typically, the infrared transparent reflective film has a visible light reflectance (75% to 85%) that is lower than the visible light reflectance (90% to 100%) of other regions on the reflective sheet. Preferably, the diffusion dot density of the area corresponding to the infrared transparent reflection film on the light guide plate is higher than the diffusion dot density of other areas on the light guide plate. Therefore, the light emitted from the light guide plate is uniform. Further, the density of the visible light reflecting particles on the infrared transparent reflecting film is less than that of the visible light reflecting particles in other areas on the reflecting sheet. Therefore, the infrared transmittance of the infrared transparent reflection film is higher, the visible light reflectivity is kept in a certain range, infrared signals effectively penetrate through the infrared transparent reflection film and are accurately and effectively collected by the fingerprint identification sensor, and meanwhile the brightness and the uniformity of the visible light source of the backlight device are kept.
In a preferred embodiment, the optical film includes a diffusion sheet and a prism sheet.
In a preferred embodiment, the fingerprint identification device comprises an optical sensor element to transmit and/or receive a biometric fingerprint optical signal; the biological fingerprint optical signal is infrared light.
In a preferred embodiment, the backlight device further comprises an iron frame, and the fingerprint identification device is arranged between the iron frame and the infrared transparent reflection film; or the fingerprint identification device is embedded in the through hole of the iron frame; or the fingerprint identification device is arranged below the iron frame.
According to the embodiment of the present invention, the backlight device of the present invention is integrated with an LCD panel and a glass cover plate into an electronic apparatus, which can be applied to an LCD display.
Drawings
The invention and its advantages will be better understood by studying the following detailed description of specific embodiments, given by way of non-limiting example, and illustrated in the accompanying drawings, in which:
FIG. 1 is an exploded view of an on-screen fingerprint identification display device of a prior art LCD display.
Fig. 2 is an exploded view of the backlight device of embodiment 1 of the present invention.
Fig. 3 is an exploded view of a backlight device of embodiment 2 of the present invention.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
The following description of the various embodiments refers to the accompanying drawings that 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 ], are only referring to the directions of the attached drawings. The positional or positional relationships indicated are based on those shown in the drawings and are merely for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may for example be fixed or indirectly connected through intervening media, or may be interconnected between two elements or may be in the interactive relationship between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example 1
First, a backlight device according to embodiment 1 of the present invention will be described with reference to fig. 2 and 3. The backlight device according to embodiment 1 of the present invention includes a light source 10 and a light guide plate 12 disposed at one side of the light source 10; a reflective sheet 11 disposed under the light guide plate 12, an optical film 13 disposed over the light guide plate 12, and a fingerprint recognition device 110 disposed under the reflective sheet 11. The reflective sheet 11 is provided with an infrared transparent reflective film 111, and the infrared transparent reflective film 111 reflects visible light, so that infrared light is collected by the fingerprint identification device 110 after passing through the infrared transparent reflective film 111. The optical film includes a diffusion sheet 131 and a prism sheet 132.
In the backlight device of the embodiment, the infrared signal carrying the biological fingerprint information effectively penetrates through the infrared transparent reflective film 111 and is accurately and effectively collected by the fingerprint identification device 110, and meanwhile, the brightness and the uniformity of the visible light source of the backlight device are maintained.
The infrared transparent reflective film 111 is integrally formed on the reflective sheet 11. The reflective sheet 11 contains Ag visible light reflective particles. The visible light reflectance of the infrared transparent reflective film 111 is lower than the visible light reflectance of other regions on the reflective sheet 11. The diffusion mesh density of the area of the light guide plate 12 corresponding to the infrared transparent reflective film 111 is higher than the diffusion mesh density of other areas of the light guide plate 12. Therefore, the light emitted from the light guide plate 12 is uniform. The density of the visible light reflecting particles on the infrared transparent reflective film 111 is smaller than the density of the visible light reflecting particles in other regions on the reflective sheet 11. Therefore, the infrared transmittance of the infrared transparent reflective film 111 is higher, the visible light reflectivity is kept in a certain range, the infrared signal effectively penetrates through the infrared transparent reflective film 111 and is accurately and effectively collected by the fingerprint identification sensor, and the brightness and the uniformity of the visible light source of the backlight device are kept.
The fingerprint recognition device 110 includes an optical sensor element to transmit and receive a biometric fingerprint optical signal; the biological fingerprint optical signal is infrared light.
The backlight device further comprises an iron frame, and the fingerprint identification device 110 is embedded in a through hole of the iron frame.
Example 2
Fig. 3 is an exploded view of a backlight module of a fingerprint identification terminal device 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 infrared transparent reflective film 111 is formed on the reflective sheet 11 in a splicing manner. The infrared transparent reflective film 111 is a multilayer composite film including a negative refractive index material.
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, the various features of the various embodiments of the present disclosure may be used in any combination, provided that there is no structural conflict, and the combination is not exhaustively described in this specification for 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 (9)
1. A backlight apparatus, comprising:
the light guide plate is arranged on one side of the light source;
the fingerprint identification device comprises a reflector plate arranged below the light guide plate, an optical film arranged above the light guide plate and a fingerprint identification device arranged below the reflector plate;
the infrared transparent reflection film is arranged on the reflection sheet, corresponds to the fingerprint identification device in position, reflects visible light and transmits infrared light, so that the infrared light is collected by the fingerprint identification device after transmitting through the infrared transparent reflection film.
2. The backlight device according to claim 1, wherein: the reflector plate contains at least one visible light reflecting particle of Ag, Al, Ni and Au.
3. The backlight device according to claim 2, wherein: the visible light reflectivity of the infrared transparent reflection film is not higher than that of other areas on the reflection sheet.
4. The backlight device according to claim 3, wherein: the density of the diffusion mesh points in the area corresponding to the infrared transparent reflection film on the light guide plate is higher than that of the diffusion mesh points in other areas on the light guide plate.
5. The backlight device according to claim 3, wherein: the density of the visible light reflecting particles on the infrared transparent reflecting film is less than that of the visible light reflecting particles on other areas on the reflecting sheet.
6. The backlight device according to claim 1, wherein: the optical film includes a diffusion sheet and a prism sheet.
7. The backlight device according to claim 1, wherein: the fingerprint identification device comprises an optical sensor element to transmit and/or receive a biometric fingerprint optical signal; the biological fingerprint optical signal is infrared light.
8. The backlight device according to claim 1, wherein: the backlight device also comprises an iron frame, and the fingerprint identification device is arranged between the iron frame and the infrared transparent reflection film; or the fingerprint identification device is embedded in the through hole of the iron frame; or the fingerprint identification device is arranged below the iron frame.
9. An electronic device for fingerprint recognition, comprising: an LCD panel, a glass cover plate and a backlight as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911307587.XA CN111123580A (en) | 2019-12-18 | 2019-12-18 | Backlight device for fingerprint identification and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911307587.XA CN111123580A (en) | 2019-12-18 | 2019-12-18 | Backlight device for fingerprint identification and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111123580A true CN111123580A (en) | 2020-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911307587.XA Pending CN111123580A (en) | 2019-12-18 | 2019-12-18 | Backlight device for fingerprint identification and electronic equipment |
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| Country | Link |
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| CN (1) | CN111123580A (en) |
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| CN109564628A (en) * | 2018-10-15 | 2019-04-02 | 深圳市汇顶科技股份有限公司 | Fingerprint identification method, device and the terminal device with fingerprint identification function |
| CN109716352A (en) * | 2018-12-17 | 2019-05-03 | 深圳市汇顶科技股份有限公司 | Liquid crystal display fingerprint mould group shields lower fingerprint recognition system and electronic equipment |
| CN109753870A (en) * | 2018-11-20 | 2019-05-14 | 深圳阜时科技有限公司 | Electronic equipment |
| CN208888832U (en) * | 2018-08-31 | 2019-05-21 | Oppo广东移动通信有限公司 | Display device and electronic equipment |
| CN110376794A (en) * | 2019-07-23 | 2019-10-25 | 深圳市隆利科技股份有限公司 | Backlight module and electronic equipment for fingerprint recognition |
| CN209708152U (en) * | 2019-05-22 | 2019-11-29 | 厦门弘汉光电科技有限公司 | A kind of backlight source module of fingerprint recognition |
| CN209728364U (en) * | 2019-10-25 | 2019-12-03 | 深圳阜时科技有限公司 | Optical detection apparatus, backlight module, display device and electronic equipment |
| CN209728383U (en) * | 2019-10-25 | 2019-12-03 | 深圳阜时科技有限公司 | Optical detection apparatus, backlight module, liquid crystal display device and electronic equipment |
| CN209746569U (en) * | 2019-05-22 | 2019-12-06 | 厦门弘汉光电科技有限公司 | Fingerprint identification backlight module with micropore matrix |
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2019
- 2019-12-18 CN CN201911307587.XA patent/CN111123580A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208888832U (en) * | 2018-08-31 | 2019-05-21 | Oppo广东移动通信有限公司 | Display device and electronic equipment |
| CN109564628A (en) * | 2018-10-15 | 2019-04-02 | 深圳市汇顶科技股份有限公司 | Fingerprint identification method, device and the terminal device with fingerprint identification function |
| CN109753870A (en) * | 2018-11-20 | 2019-05-14 | 深圳阜时科技有限公司 | Electronic equipment |
| CN109716352A (en) * | 2018-12-17 | 2019-05-03 | 深圳市汇顶科技股份有限公司 | Liquid crystal display fingerprint mould group shields lower fingerprint recognition system and electronic equipment |
| CN209708152U (en) * | 2019-05-22 | 2019-11-29 | 厦门弘汉光电科技有限公司 | A kind of backlight source module of fingerprint recognition |
| CN209746569U (en) * | 2019-05-22 | 2019-12-06 | 厦门弘汉光电科技有限公司 | Fingerprint identification backlight module with micropore matrix |
| CN110376794A (en) * | 2019-07-23 | 2019-10-25 | 深圳市隆利科技股份有限公司 | Backlight module and electronic equipment for fingerprint recognition |
| CN209728364U (en) * | 2019-10-25 | 2019-12-03 | 深圳阜时科技有限公司 | Optical detection apparatus, backlight module, display device and electronic equipment |
| CN209728383U (en) * | 2019-10-25 | 2019-12-03 | 深圳阜时科技有限公司 | Optical detection apparatus, backlight module, liquid crystal display device and electronic equipment |
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Application publication date: 20200508 |