CN108091680B - Light-emitting diode panel for optical fingerprint identification in screen - Google Patents
Light-emitting diode panel for optical fingerprint identification in screen Download PDFInfo
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- CN108091680B CN108091680B CN201810011396.8A CN201810011396A CN108091680B CN 108091680 B CN108091680 B CN 108091680B CN 201810011396 A CN201810011396 A CN 201810011396A CN 108091680 B CN108091680 B CN 108091680B
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- light
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- optical
- light guide
- emitting diode
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
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- 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
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
Abstract
The invention discloses a light-emitting diode panel for identifying optical fingerprints in a screen, which utilizes directional light rays provided by a light-emitting diode to be conducted in a light guide substrate in a total reflection mode so as to sense fingerprints pressed on a fingerprint receiving area, and an optical sensing element converts an optical signal into an electrical signal so as to distinguish the characteristics of the fingerprints. Because the light emitting diode is directly used as a light source, the photodiode can be used as a light sensing element and integrated in the light shielding layer area of the light emitting diode panel, the purpose of integrating the light sensing element can be realized without increasing the area of the substrate, and in addition, because the surface of the almost whole light guide substrate can be provided with the area for fingerprint touch, the use convenience is improved. Because the directional light can pass through the specific optical microstructure to adjust the light path before entering the light sensing device, the influence of the direct light or the strong light of the environment can be minimized under the general use condition to ensure the accuracy of the fingerprint identification.
Description
Technical Field
The present invention relates to a light emitting diode panel, and more particularly to a light emitting diode panel with optical fingerprint recognition integrated therein.
Background
Currently, the fingerprint identification technology mainly includes semiconductor type, optical type and ultrasonic type, wherein the semiconductor type and the optical type are more mature technologies and are also the mainstream fingerprint identification technology in the prior art. The principle of the semiconductor type fingerprint sensor is that a high-density capacitance sensor or a miniaturized sensor such as a pressure sensor is integrated in a chip, and when a fingerprint presses the surface of the chip, the internal miniaturized capacitance sensor can form a fingerprint image according to different charge quantities (or temperature difference) generated by gathering of fingerprint peaks and valleys. The optical fingerprint sensor utilizes a light source, an optical element and a photoelectric sensor to jointly form a set of fingerprint acquisition equipment, the absorption and the destruction of the wave crest and the wave trough of the fingerprint on the total reflection are realized by pressing with a finger, a fingerprint image is obtained, and then the image is captured and output to achieve the distinguishing effect. Since the optical acquisition mode is a non-contact chip, that is, the pressing part of the fingerprint is made of optical elements such as acryl or glass, the optical acquisition mode has the greatest advantages of low price and durability.
However, in the conventional mobile device, the fingerprint identification is usually independently arranged, and the fingerprint identification cannot be performed simultaneously with the display work, so that the fingerprint identification is independently arranged in one area, and some operators are arranged on the back cover or the side edge of the mobile device.
With the technical development of the light emitting diode panel becoming mature, the invention provides an on-screen optical fingerprint identification light emitting diode panel by utilizing the characteristic of light emitting of the light emitting diode and combining the optical fingerprint identification technology, wherein the light emitting diode panel can be embedded in the light emitting diode panel, and the interference of an ambient light source and a strong light source during fingerprint identification is greatly reduced through a unique light path design.
Disclosure of Invention
The main purpose of the present invention is to design the total reflection light path of the directional light in the panel to provide the light signal required for fingerprint identification, so that the fingerprint can be effectively identified in any light interference environment.
The secondary objective of the present invention is to integrate the light sensing device on the led substrate, and provide directional light through the led, so that no additional light source is required.
Another objective of the present invention is to use a photodiode as a light sensing device and integrate it into a light emitting diode substrate.
Another objective of the present invention is to provide an optical fingerprint identification led panel, wherein most of the panel area is used as a fingerprint receiving area for fingerprints, and the light sensing device is disposed in the light shielding layer area of the led substrate, so that a full screen display of the fingerprint identification panel can be realized.
The light emitting diode panel comprises a light emitting diode substrate, a light guide substrate and a light sensing element, wherein the light emitting diode substrate is provided with a plurality of light emitting diodes, at least one light emitting diode is used for providing directional light, the fingerprint receiving area of the light guide substrate is used for effectively pressing a finger, the directional light from a light source enters the light guide substrate from the signal leading-in area and is totally reflected to generate an optical signal, and finally the signal leading-out area leaves the light guide substrate and enters the light sensing element to convert the optical signal into an electrical signal so as to complete the fingerprint characteristic identification of the finger.
Because the invention uses the light with specific directivity as the optical signal light source for fingerprint identification, and ensures the transmission effectiveness of the optical signal by the way of total reflection, the fingerprint identification effect in the screen displayed in full screen can be achieved, and simultaneously, the light sensing element is substantially correspondingly arranged in the light shielding layer area of the light emitting diode substrate, thereby not only not influencing the original design of the light emitting diode panel, but also maintaining the characteristic of thinning the light emitting diode panel.
Drawings
Fig. 1 is a schematic structural cross-sectional view of an led panel for on-screen optical fingerprint identification according to the present invention.
FIG. 2a is a cross-sectional view of a partial structure of an optical structure with an optical element (grating).
Fig. 2b is a schematic sectional view of a partial structure with a Fresnel lens as an optical structure.
FIG. 2c is a schematic cross-sectional view of a partial structure with an optical microstructure as an optical structure.
Fig. 3 is a schematic structural cross-sectional view of another light-emitting diode panel for in-screen optical fingerprint identification according to the present invention.
Fig. 4 is a schematic cross-sectional view of another structure of an led panel for on-screen optical fingerprint identification according to the present invention.
Description of reference numerals: 1a, 1b, 1c, 1d, 1 f-light-emitting diode panel of optical fingerprint recognition in the screen; 12-a light-guiding substrate; 122-fingerprint receiving area; 124-signal lead-in area; 126-a signal derivation area; 14-a light emitting diode substrate; 16-a light sensing element; 22-a light emitting diode; 24-a light emitting diode; 26-a polarizing substrate; 28-a protective glass substrate; 32-a main display area; 34-sub display area; 42-optical structures (gratings); 44-optical structures (Fresnel lenses); 46-optical structures (optical microstructures); FG-finger; BM-light blocking layer area.
Detailed Description
The technical means and structure of the present invention are described in detail in the following for the preferred embodiments of the present invention.
Fig. 1 is a schematic cross-sectional view of a light emitting diode panel for on-screen optical fingerprint identification according to the present invention. The led panel 1a for in-screen optical fingerprint identification has a main display area 32 and a sub-display area 34, and the led panel 1a for in-screen optical fingerprint identification of the present invention includes an led substrate 14, a light guide substrate 12 and a light sensing element 16.
The led substrate 14 has a plurality of leds 22, 24, and at least one led 22 is used to provide directional light (shown by dotted line), and the other leds 24 are used to provide light required by the led panel 1a for on-screen optical fingerprint identification, therefore, the led panel 1a for on-screen optical fingerprint identification provided by the present invention does not need to be additionally provided with a light source, but does not provide enough display light to the main display area 32, and at the same time, the led 22 for providing directional light (shown by dotted line) is preferably arranged at a position substantially corresponding to the sub-display area 34 without affecting the display quality. Meanwhile, in order to prevent the fingerprint identification by optical judgment from being affected by ambient light or strong light, the present invention is used as light having a specific directivity for the fingerprint identification, so that the directional light (indicated by a dotted line) can enter the light guide substrate 12 at a specific angle, thereby being separated from the light from the environment or the strong light and ensuring the accuracy of the fingerprint identification.
In addition, the led panel 14 may be an active oled substrate, a passive oled substrate, a millimeter-sized led substrate, or a micro-sized led substrate, and the leds 22 and 24 disposed thereon may be correspondingly active oleds, passive oleds, millimeter-sized leds, or micro-sized leds.
The light guide substrate 12 has a fingerprint receiving area 122, a signal guiding area 124 and a signal guiding area 126, wherein the fingerprint receiving area 122 may include the entire display area of the led panel 1a or the partial display area of the led panel 1a, in other words, the fingerprint receiving area 122 may correspond to the main display area 32 of the led panel 1a and at least a partial or entire sub-display area 34, or the fingerprint receiving area 122 may correspond to the entire main display area 32 of the led panel 1a or the fingerprint receiving area 122 corresponds to the partial main display area 32 of the led panel 1a only, wherein the main display area 32 is used to display important information such as but not limited to main function options, a dialog window, a numeric key display area, etc., and the sub-display area 34 is used to display less important information such as but not limited to time, date, temperature, or even an area that does not display any information and only provides a background picture or a frame (bezel) hidden outside, taking this embodiment as an example, the fingerprint receiving area 122 includes the entire main display area 32 and the partial sub-display area 34. The signal input area 124 and the signal output area 126 in the light guide substrate 12 may be in the form of mirrors, prism films, gratings, or optical fibers.
According to the above structure, the directional light (shown by the dotted line) provided by the specific light emitting diode 22 enters the light guide substrate 12 from the signal introducing area 124 and is totally reflected inside the light guide substrate 12, when the finger FG of the user is pressed within the range of the fingerprint receiving area 122, the path of the directional light (shown by the dotted line) is changed and an optical signal is simultaneously generated, when the directional light (shown by the dotted line) leaves the light guide substrate 12 from the signal deriving area 126, the directional light enters the light sensing element 16, the light sensing element 16 receives the energy of the directional light (shown by the dotted line) and generates a voltage change, so that the optical signal is converted into an electrical signal, and then the fingerprint characteristic of the finger FG of the user is determined by the optical processor (not shown). Since the optical signal of the fingerprint features only occupies about 120-180 bytes, it can be selectively integrated with a display processor (not shown) and a touch processor (not shown) into a single driving circuit.
In addition, at least one optical structure 42, 44, 46 may be selectively disposed between the led substrate 14 and the light guide substrate 12, so that the directional light (indicated by a dotted line) provided by the led 22 can enter the signal introducing region 124 of the light guide substrate 12 in a collimated manner after passing through the optical structure 42, 44, 46, or enter the signal introducing region 124 of the light guide substrate 12 in a manner of having a specific incident angle, where the optical structure 42, 44, 46 may be selected from an optical element, a secondary element, an optical microstructure, and a combination thereof. Fig. 2a, 2b and 2c disclose three types of led panels 1b, 1c, 1d for in-screen optical fingerprint recognition, first, as shown in fig. 2a, which take an optical element (grating) 42 as an example, directional light rays (shown by dotted lines) from the leds 22 are adjusted to incident light with a specific incident angle before entering the light guide substrate 12, while fig. 2b discloses a type of a secondary element (Fresnel lens) 44 as an example, directional light rays (shown by dotted lines) from the leds 22 are adjusted to collimated incident light before entering the light guide substrate 12, and are guided into the light guide substrate by groove slope at the light guide substrate, which slope may also be located at the edge of the light guide substrate, and finally, as shown by optical microstructure 46, in fig. 2c, directional light rays (shown by dotted lines) from the leds 22 are adjusted to collimated incident light before entering the light guide substrate 12, it is noted that the above-mentioned optical structures 42, 44, 46 and final structures and structures (shown by dotted lines) are adjusted to the light guide substrate 12 according to the pattern, and it is important that the directional light rays (42) from the light guide substrate 22 can be adjusted to the incident light rays (gratings) to the incident angle before entering the light guide substrate 12, and the light guide substrate 12 can be adjusted to the light angles of the light guide substrate, and are not limited by the dotted lines, and the optical structure, and the light guide substrate 12, and the light guide structures 42 can be adjusted to the light guide substrate 12, and the light guide structures are also adjusted to the light angles shown by the optical microstructure 42, and the optical structure. Although the optical structures 42, 44, and 46 are shown as separate structures, the optical structures 42, 44, and 46 may be integrated with the light guide substrate 12 in actual design.
Please refer to fig. 3, which is a schematic structural cross-sectional view of another light emitting diode panel for on-screen optical fingerprint recognition according to the present invention, in which the structure needs to use the difference of refractive index to control the light to enter the light guide substrate for transmission, the refractive index 1 is the same as or close to that of the light guide substrate, and the refractive index 2 is smaller than that of the light guide substrate. In the light emitting diode panel 1e for in-screen optical fingerprint recognition in this embodiment, the light sensing element 16 is an independent element and is disposed below the light guide substrate 12.
Referring to fig. 4, the light emitting diode panel 1f for on-screen optical fingerprint recognition in the present embodiment further includes a polarizing substrate 26 and a protective glass substrate 28 disposed between the light guide substrate 12 and the light emitting diode substrate 14, but the polarizing substrate 26 and the protective glass substrate 28 may be selectively disposed, in other words, the polarizing substrate 26 and the protective glass substrate 28 may be disposed at the same time or alternatively, or the polarizing substrate 26 and the protective glass substrate 28 may be integrated into a single structure. Meanwhile, the polarizing substrate 26 may be integrated with the light guide substrate 12 into a single structure, or the polarizing substrate 26, the cover glass substrate 28 and the light guide substrate 12 may be further integrated into a single structure. As can be seen from the above, the light guide substrate 12 not only provides the directional light (indicated by the dotted line) for fingerprint identification for total reflection, but also has the functions of polarization and protection.
In summary, the light emitting diode panel for in-screen optical fingerprint identification according to the present invention integrates the light sensing device for detecting a fingerprint in the light emitting diode panel, senses the fingerprint pressed on the fingerprint receiving area through the total reflection of the directional light in the light guide substrate, and converts the optical signal into the electrical signal through the light sensing device to identify the characteristic of the fingerprint, and particularly, the light sensing device formed by the photodiode is integrated on the light shielding layer area of the light emitting diode substrate, so that the display effect and quality of the panel are not reduced. The directional light can pass through the specific optical microstructure to adjust the light path before entering the light sensing device, and a signal amplifying device (not shown) disposed between the light guide substrate and the light sensing device can be used to maintain the intensity of the optical signal and ensure the accuracy of fingerprint identification.
In practical use, the light emitting diode panel for on-screen optical fingerprint identification provided by the invention can be applied to various devices with screens, such as mobile devices, screens, televisions and the like, and as the light emitting diode panel provided by the invention has a relatively large fingerprint receiving area, the fingerprint identification can be easily carried out without great care for users, and the function of fingerprint protection for users can be further improved due to the improvement of the use convenience no matter a wake-up device or identity identification is carried out.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all the equivalent changes or modifications of the features and the spirit of the present invention described in the claims should be included in the protection scope of the present invention.
Claims (18)
1. The utility model provides a light emitting diode panel that optical fingerprint discerned in screen has a main display area and a display area, and the light emitting diode panel that optical fingerprint discerned in this screen supplies a finger to carry out fingerprint to discern, its characterized in that contains:
a LED substrate having a plurality of LEDs, at least one of the LEDs being disposed closer to or in the sub-display region to provide a directional light, and the rest of the LEDs providing the light required by the LED panel;
a light guide substrate arranged above the light emitting diode substrate, the light guide substrate having at least a fingerprint receiving area, a signal lead-in area and a signal lead-out area, the fingerprint receiving area being pressed by the finger effectively, the directional light from the light emitting diode entering the light guide substrate from the signal lead-in area and totally reflecting in the light guide substrate, and generating an optical signal when the finger presses the fingerprint receiving area and leaving the light guide substrate from the signal lead-out area; and
and the light sensing element is arranged between the light emitting diode substrate and the light guide substrate and positioned on the light path of the directional light rays leaving the light guide substrate, and converts the optical signal into an electrical signal to identify the fingerprint characteristic of the finger after receiving the optical signal leaving the light guide substrate, wherein the light sensing element is a photodiode and is arranged between two adjacent light emitting diodes which provide the light rays required by the light emitting diode panel for identifying the optical fingerprint in the screen during display.
2. The led panel for in-screen optical fingerprint recognition of claim 1, wherein at least one optical structure is disposed between the led and the light guide substrate, and the directional light provided by the led passes through the optical structure and enters the signal guiding region of the light guide substrate in a collimated or non-collimated manner.
3. The on-screen optical fingerprint recognition light emitting diode panel of claim 2 wherein the optical structures are optical elements, secondary elements, optical microstructures and combinations thereof.
4. The on-screen optical fingerprint identification light emitting diode panel of claim 2 wherein the optical structure is a free-standing structure.
5. The on-screen optical fingerprint recognition led panel of claim 2 wherein the optical structure is integrated into the light guide substrate.
6. The LED panel for in-screen optical fingerprint recognition of claim 1, wherein the LED substrate is an active OLED substrate, a passive OLED substrate, a millimeter-wave LED substrate or a micro-LED substrate.
7. The led panel for on-screen optical fingerprint recognition according to claim 1, wherein the leds for providing the directional light are active oleds, passive oleds, millimeter leds or micro leds.
8. The on-screen optical fingerprint recognition led panel of claim 1 wherein the fingerprint receiving area is all or a portion of the light guide substrate.
9. The on-screen optical fingerprint recognition led panel of claim 1 wherein the signal lead-in area and the signal lead-out area are in the form of mirrors, prism films, gratings or optical fibers.
10. The on-screen optical fingerprint recognition light emitting diode panel of claim 1 wherein the light sensing element is a stand-alone element.
11. The on-screen optical fingerprint identification led panel of claim 10 wherein the light sensing element is disposed below the light guide substrate.
12. The on-screen optical fingerprint identification led panel of claim 1 wherein the light sensing element is integrated into the led substrate.
13. The led panel for optical fingerprint identification as claimed in claim 12, wherein the photodiode is correspondingly disposed in a light-shielding region of the led substrate.
14. The LED panel for in-screen optical fingerprint recognition of claim 1, wherein at least one of a polarizer substrate and a protective glass substrate is disposed between the light guide substrate and the LED substrate.
15. The on-screen optical fingerprint recognition led panel of claim 14 wherein the light guide substrate is further integrated with at least one of the polarizer substrate and the cover glass substrate into a single structure.
16. The led panel of claim 1, wherein a signal amplification element is disposed between the light guide substrate and the light sensing element for amplifying the optical signal leaving the light guide substrate.
17. The on-screen optical fingerprint recognition led panel of claim 1 wherein the optical signal and the electrical signal are further processed by an optical processor to recognize the fingerprint feature of the finger.
18. The on-screen optical fingerprint recognition led panel of claim 17 wherein the optical processor is further integrated with a display processor of the on-screen optical fingerprint recognition led panel or the optical processor is further integrated with a touch processor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011396.8A CN108091680B (en) | 2018-01-05 | 2018-01-05 | Light-emitting diode panel for optical fingerprint identification in screen |
| PCT/CN2018/000058 WO2019134062A1 (en) | 2018-01-05 | 2018-01-31 | Light-emitting diode panel for in-screen optical fingerprint recognition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011396.8A CN108091680B (en) | 2018-01-05 | 2018-01-05 | Light-emitting diode panel for optical fingerprint identification in screen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108091680A CN108091680A (en) | 2018-05-29 |
| CN108091680B true CN108091680B (en) | 2022-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810011396.8A Active CN108091680B (en) | 2018-01-05 | 2018-01-05 | Light-emitting diode panel for optical fingerprint identification in screen |
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| CN (1) | CN108091680B (en) |
| WO (1) | WO2019134062A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108878488B (en) * | 2018-06-26 | 2020-12-04 | 上海天马有机发光显示技术有限公司 | Display panel, display device and manufacturing method of display panel |
| CN109786418B (en) * | 2018-12-26 | 2021-06-04 | 惠科股份有限公司 | Micro light-emitting diode display panel and display device |
| CN112084996A (en) * | 2020-09-21 | 2020-12-15 | 上海悠睿光学有限公司 | Fingerprint recognition device under screen and electronic equipment |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256623A (en) * | 2007-03-02 | 2008-09-03 | 全量工业股份有限公司 | System for identification of fingerprint |
| CN101789074B (en) * | 2009-01-23 | 2014-10-01 | 金佶科技股份有限公司 | Light guide module of optical fingerprint identification system |
| TWI382350B (en) * | 2009-02-19 | 2013-01-11 | Gingy Technology Inc | Optical Fingerprint Identification System |
| TW201409324A (en) * | 2012-08-21 | 2014-03-01 | Wintek Corp | Touch display panel and optical touch panel thereof |
| TWI486844B (en) * | 2012-09-25 | 2015-06-01 | Au Optronics Corp | Optical touch device with scan ability |
| WO2017129126A1 (en) * | 2016-01-31 | 2017-08-03 | Shenzhen GOODIX Technology Co., Ltd. | Under-screen optical sensor module for on-screen fingerprint sensing |
| CN105184282B (en) * | 2015-10-14 | 2019-04-23 | 京东方科技集团股份有限公司 | Optical finger print detection device and display equipment |
| CN107251046B (en) * | 2015-10-23 | 2021-02-12 | 深圳市汇顶科技股份有限公司 | Optical fingerprint sensor and package |
| CN106228144B (en) * | 2016-08-02 | 2023-10-13 | 京东方科技集团股份有限公司 | Fingerprint identification display device |
| CN207731930U (en) * | 2018-01-05 | 2018-08-14 | 敦捷光电股份有限公司 | The light-emitting-diode panel of optical finger print identification in screen |
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2018
- 2018-01-05 CN CN201810011396.8A patent/CN108091680B/en active Active
- 2018-01-31 WO PCT/CN2018/000058 patent/WO2019134062A1/en active Application Filing
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| Publication number | Publication date |
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| CN108091680A (en) | 2018-05-29 |
| WO2019134062A1 (en) | 2019-07-11 |
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