CN111917906A - Electronic device - Google Patents

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Publication number
CN111917906A
CN111917906A CN202010778169.5A CN202010778169A CN111917906A CN 111917906 A CN111917906 A CN 111917906A CN 202010778169 A CN202010778169 A CN 202010778169A CN 111917906 A CN111917906 A CN 111917906A
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China
Prior art keywords
light
filter layer
electronic device
linear polarizer
photosensitive unit
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CN202010778169.5A
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Chinese (zh)
Inventor
徐海东
段俊杰
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Vivo Mobile Communication Co Ltd
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Vivo Mobile Communication Co Ltd
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Priority to CN202010778169.5A priority Critical patent/CN111917906A/en
Publication of CN111917906A publication Critical patent/CN111917906A/en
Priority to PCT/CN2021/110516 priority patent/WO2022028469A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0264—Details of the structure or mounting of specific components for a camera module assembly
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

The application discloses electronic equipment belongs to electronic equipment technical field. The electronic equipment of the embodiment of the application comprises: a first filter layer; the first light-sensitive unit and the second light-sensitive unit are arranged, and a second filter layer is arranged between the first filter layer and the first light-sensitive unit; a light source located between the first and second filter layers; light emitted by the light source is directly transmitted to the second photosensitive unit, the light emitted by the light source is transmitted to the first photosensitive unit through the second filter layer, ambient light is transmitted to the second filter layer and the second photosensitive unit after passing through the first filter layer, and the ambient light is blocked by the first filter layer and the second filter layer. According to the embodiment of the application, the light energy emitted by the light source and the light energy emitted by the environment can be respectively obtained through the first photosensitive unit and the second photosensitive unit, so that the separation of the two lights is realized, and the purpose of accurately separating and measuring the light emitted by the environment and the light emitted by the OLED can be further achieved.

Description

Electronic device
Technical Field
The application belongs to the technical field of electronic equipment, and particularly relates to electronic equipment.
Background
Along with the popularization of the application of the full-face screen on a mobile phone product, the front sensor on the mobile phone comprises a camera, a distance sensor, a photosensitive sensor, a sound pick-up and the like, how to design the front sensor to ensure that the front sensor can continuously play a role needs to be considered, and some telescopic camera schemes, under-screen sensing schemes, micro-slit technical schemes and the like appear at present.
Among them, the under-screen technology is an important development trend, such as under-screen fingerprint, under-screen laser focusing, under-screen light sensitivity, etc. Most of these sensors are optical, and Organic Light-Emitting diodes (OLEDs) have a certain transmittance, so that the optical sensor can be theoretically placed under the screen for photoelectric detection. In the process of implementing the present application, the inventor finds that at least the following problems exist in the prior art: the self-luminescence of the OLED screen may disturb the detection performance of the sensor. If the influence of self-luminescence of the OLED can not be effectively filtered, the detection performance of the optical sensor under the screen can be seriously influenced, however, the related technology is difficult to accurately separate and measure the ambient light and the light emitted by the OLED.
Disclosure of Invention
An object of the embodiments of the present application is to provide an electronic device, which can solve the problem that it is difficult to accurately perform separate measurement on ambient light and light emitted by an OLED in the related art.
In order to solve the technical problem, the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides an electronic device, including:
a first filter layer;
the first light-sensitive unit and the second light-sensitive unit are arranged on the same plane, wherein a second filter layer is arranged between the first filter layer and the first light-sensitive unit;
a light source located between the first optical filter layer and the second optical filter layer;
the light emitted by the light source is directly transmitted to the second photosensitive unit, the light emitted by the light source is transmitted to the first photosensitive unit through the second filter layer, the ambient light is transmitted to the second filter layer and the second photosensitive unit after passing through the first filter layer, and the ambient light is blocked by the first filter layer and the second filter layer.
In this application embodiment, through setting up first filter layer and second filter layer for the light that the light source sent transmits first photosensitive unit and second photosensitive unit, and ambient light only transmits the second photosensitive unit, thereby can obtain the light energy that the light source of electronic equipment sent and the light energy of ambient light respectively through first photosensitive unit and second photosensitive unit, realizes the separation of two kinds of light, and then can reach the purpose of accurately carrying out the separation measurement to ambient light and the light of OLED screen.
Drawings
FIG. 1 is a schematic diagram of a filter of an OLED filter layer;
FIG. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 3 is a second schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a second filter layer in an electronic device according to an embodiment of the present application;
fig. 5 is a schematic diagram of filtering light of a first filter layer and a second filter layer in an embodiment of the present application;
FIG. 6 is a schematic diagram of the positions of the second linear polarizer and the second wave plate in the embodiment of the present application;
fig. 7 is a second schematic view illustrating positions of the second linear polarizer and the second wave plate in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
In order to make the electronic device of the embodiments of the present application better understood by those skilled in the art, the OLED will be described as follows.
Role of OLED filter (filter) layer: the OLED display panel is a self-luminous display mode, but when an external light source irradiates the metal electrode of the OLED and is reflected, reflected light interference is caused on the surface of the display screen of the OLED, and the contrast is reduced. The basic structure of the OLED filter layer is divided into a polarizing part (polarizer) and an 1/4 λ functional compensation part (1/4 λ plate) to block the reflection of external light to ensure that the screen maintains high contrast.
The OLED filter layer has the function that ambient light cannot be reflected and escape after entering the screen, so that the purpose of reducing the contrast ratio influenced by the ambient light is achieved. The process is shown in fig. 1, the environment light is uniformly polarized light (i), and after passing through a linear polarizer, the environment light becomes linear polarization (ii), and after passing through 1/4 wave plates, the environment light becomes circularly polarized light (iii); after reflection at the OLED layer, the direction of rotation of the circular polarization is changed (r), and after passing through the original 1/4 plate again, it becomes linearly polarized (r) perpendicular to the polarization direction of the polarizer, and thus cannot pass through the polarizer, and no light escapes.
The OLED filter is inherently present for OLED screens, and it also changes the polarization characteristics of the incoming OLED light. The OLED screen reflects and absorbs ambient light, yet a small portion of the ambient light passes through the OLED screen and enters beneath the screen. It is this portion of light energy that is detected by the underscreen photosensor that performs the associated function.
However, the photoelectric sensor is directly placed under the screen, self-luminescence of the OLED screen can be received by the sensor, and detection performance of the sensor is interfered.
The electronic device provided by the embodiment of the present application is described in detail below with reference to the accompanying drawings through specific embodiments and application scenarios thereof.
As shown in fig. 2, an embodiment of the present application provides an electronic device, including:
a first filter layer 201;
a first photosensitive unit 202 and a second photosensitive unit 203, wherein a second filter layer 204 is arranged between the first filter layer 201 and the first photosensitive unit 202;
a light source 205, the light source 205 being located between the first filter layer 201 and the second filter layer 204;
light emitted by the light source 205 is directly transmitted to the second photo-sensing unit 203, light emitted by the light source 205 is transmitted to the first photo-sensing unit 202 through the second filter layer 204, ambient light is transmitted to the second filter layer 204 and the second photo-sensing unit 203 after passing through the first filter layer 201, and the ambient light is blocked by the first filter layer 201 and the second filter layer 204.
As shown in fig. 2, ambient light (indicated by solid arrows in fig. 2) is uniformly polarized light, and is changed into circularly polarized light after passing through the first filter layer 201, and then enters the second filter layer 204 and the second photosensitive unit 203, and the circularly polarized light is blocked from entering the first photosensitive unit 202 due to the second filter layer. Light (indicated by a dotted arrow in fig. 2) emitted by the light source 205 is uniformly polarized light, the light emitted by the light source 205 is incident on the second filter layer 204 and then becomes linearly polarized light to be incident on the first photosensitive unit 202, and simultaneously, the uniformly polarized light emitted by the light source 205 is incident on the second photosensitive unit 203.
The electronic equipment of this application embodiment, through setting up first filter layer and second filter layer for the light that the light source sent transmits first photosensitive unit and second photosensitive unit, ambient light only transmits the second photosensitive unit, thereby can obtain the light energy that the light source of electronic equipment sent and the light energy of ambient light respectively through first photosensitive unit and second photosensitive unit, realize the separation of two kinds of light, and then can reach and accurately carry out the separation measuring purpose to the light of ambient light and OLED screen.
Further, the light source 205 is an organic light emitting diode OLED.
Here, when the light source is OLED, through this application embodiment can separate environment light and the light that OLED self-sent, and then can solve the self-luminous problem that can disturb the detection performance of sensor of OLED screen for the performance of photoelectric sensor greatly improves under the screen.
Further, as shown in fig. 3, the first filter layer 201 includes a first linear polarizer 2011 and a first waveplate 2012;
wherein the first waveplate 2012 is positioned between the first linear polarizer 2011 and the light source 205.
Specifically, the first wave plate is a λ/4 wave plate. Ambient light (shown by solid arrows in fig. 3) is uniformly polarized light, and is changed into linearly polarized light after passing through the first linear polarizer 2011, then changed into circularly polarized light after passing through the first wave plate 2012, and then the circularly polarized light penetrates through the OLED layer without changing polarization characteristics, and then enters the second filter layer 204 and the second photosensitive unit 203. That is, the light energy of the light source and the light energy of the ambient light are detected by the second photosensitive unit 203. The light energy of the light source is almost not attenuated after reaching the second photosensitive unit, namely 100% of the light energy reaches the second photosensitive unit, and the light energy of the ambient light is approximately attenuated by 95% after reaching the second photosensitive unit.
Through this first filter layer can let ambient light get into can not reflect away after the OLED screen, realize reducing the purpose that ambient light influences the contrast.
Further, as shown in fig. 4, the second filter layer 204 includes a second wave plate 2041 and a second linear polarizer 2042;
the second waveplate 2041 is located between the second linear polarizer 2042 and the light source 205.
Optionally, the second wave plate 2041 is an 1/4 wave plate. As shown in fig. 4, the ambient light is circularly polarized after passing through the light source 205, the circularly polarized light is changed into linearly polarized light after passing through the second wave plate 2041, and the polarization state of the linearly polarized light is perpendicular to that of the second linear polarizer, so that the linearly polarized light cannot pass through the second linear polarizer and is completely blocked, but the light emitted from the light source does not change the uniform polarization state after passing through the second wave plate 2041, and then passes through the second linear polarizer and is changed into linearly polarized light, and the light energy value of the linearly polarized light is attenuated by about 45%.
The second filter layer is matched with the first filter layer, so that the light energy emitted by the light source and the light energy of the ambient light can be obtained respectively, and the separation of the two lights is realized.
Further, in order to ensure that the light emitted by the light source is transmitted to the first photosensitive unit and the second photosensitive unit, the ambient light is only transmitted to the second photosensitive unit, and an included angle between the polarization axis 20421 of the second linear polarizer 2042 and the fast axis 20411 of the second wave plate 2041 needs to be specially set, in this embodiment of the present application, an included angle between the polarization axis 20421 of the second linear polarizer 2042 and the fast axis 20411 of the second wave plate 2041 is 45 degrees. The specific process of polarization state is shown in fig. 5, and the extinction effect of all light cut-off is finally realized. Here, the polarization characteristics of ambient light are mainly changed by the phase retardation technique, but this phase retardation process does not work for light emitted from a light source (e.g., OLED light).
Further, as shown in fig. 6, when the ambient light is right-hand polarized light after passing through the first filter layer, the polarization axis of the second linear polarizer is in the first angular state, and when the polarization axis of the second linear polarizer is in the first angular state, the polarization axis 20421 of the second linear polarizer 2042 rotates counterclockwise by 45 degrees and then coincides with the fast axis 20411 of the second wave plate 2041.
Further, as shown in fig. 7, when the ambient light is left-hand polarized light after passing through the first filter layer, the polarization axis of the second linear polarizer is in the second angular state, and when the polarization axis of the second linear polarizer is in the second angular state, the polarization axis 20421 of the second linear polarizer 2042 rotates clockwise by 45 degrees and then coincides with the fast axis 20411 of the second wave plate 2041.
Here, an angle between the polarization axis of the second linear polarizer and the fast axis of the second wave plate is set to ensure that the light emitted from the light source is transmitted to the first photosensitive unit and the second photosensitive unit, and the ambient light is transmitted only to the second photosensitive unit.
Further, the first photosensitive unit and the second photosensitive unit are both photosensitive sensors.
Here, an included angle between the polarization axis of the second linear polarizer and the fast axis of the second wave plate is set to ensure that the light emitted by the light source is transmitted to the first photosensitive unit and the second photosensitive unit, the ambient light is transmitted only to the second photosensitive unit, and then the energy value of the light source and the energy value of the ambient light can be obtained according to the energy values detected by the two photosensitive sensors, respectively.
Assuming that the light emitted by the light source is OLED light, it is denoted as EoAmbient light, denoted as Ee. The energy values of the first photosensitive unit and the second photosensitive unit are shown in table 1.
TABLE 1
Figure BDA0002619240740000061
Assuming that the illuminance value of the first photosensitive element is E1, the ambient light E reaching the first photosensitive element1eAnd OLED self-luminescence E1oBy the same token, the illuminance value of the second photosensitive element is E2, the ambient light E reaching the second photosensitive element2eAnd OLED self-luminescence E2oAnd (4) forming.
E1 and E2 were obtained by sensor readings, EeAnd EoIs the data that is desired to be obtained. At this time, we can obtain E through a simple relationshipeAnd Eo：
E1＝E1e+E1O＝0+EO*45％；
E2＝E2e+E2O＝Ee*4％+EO*100％；
The solution is obtained by solving the above-mentioned problems,
Figure BDA0002619240740000071
further, the electronic device according to the embodiment of the present application, as shown in fig. 2, further includes:
the light-transmitting layer 207 is disposed on the surface of the first filter layer 201.
In particular, the light-transmitting layer may be a glass cover plate.
Further, the electronic device of the embodiment of the present application further includes: and a Printed Circuit Board (PCB) on which the first and second light sensing units are disposed.
The electronic equipment of this application embodiment, through setting up first filter layer and second filter layer for the light that the light source sent transmits first photosensitive unit and second photosensitive unit, ambient light only transmits the second photosensitive unit, thereby can obtain the light energy that the light source of electronic equipment sent and the light energy of ambient light respectively through first photosensitive unit and second photosensitive unit, realize the separation of two kinds of light, and then can reach and accurately carry out the separation measuring purpose to the light of ambient light and OLED screen.
In the embodiment of the application, the polarization state of the photoelectric sensor under the screen is restored or changed (namely, a specially designed polarization film group layer is configured for the photoelectric device) by reasonably utilizing the polarization film (first filter layer) inherent to the OLED screen, so that the polarization state of the environmental light to be detected and the polarization state of the OLED light are consistent or perpendicular to each other, and the two lights are peeled off.
The embodiment of the application is not limited to the application of photosensitive under the screen, and for all OLED screens, the method of the wave plate and the linear polarizer disclosed by the embodiment of the application is applicable as long as the photoelectric sensing under the screen is applied; such as laser focusing under a screen, spectral measurement under a screen, fingerprint identification under a screen, etc., and an under-screen technology based on photoelectric detection, etc.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. An electronic device, comprising:
a first filter layer;
the first light-sensitive unit and the second light-sensitive unit are arranged on the same plane, wherein a second filter layer is arranged between the first filter layer and the first light-sensitive unit;
a light source located between the first optical filter layer and the second optical filter layer;
the light emitted by the light source is directly transmitted to the second photosensitive unit, the light emitted by the light source is transmitted to the first photosensitive unit through the second filter layer, the ambient light is transmitted to the second filter layer and the second photosensitive unit after passing through the first filter layer, and the ambient light is blocked by the first filter layer and the second filter layer.
2. The electronic device of claim 1, wherein the light source is an Organic Light Emitting Diode (OLED) layer.
3. The electronic device of claim 1, wherein the first optical filter comprises a first linear polarizer and a first waveplate;
wherein the first wave plate is located between the first linear polarizer and the light source.
4. The electronic device of claim 3, wherein the first waveplate is an 1/4 waveplate.
5. The electronic device of claim 1, wherein the second optical filter comprises a second waveplate and a second linear polarizer;
the second waveplate is positioned between the second linear polarizer and the light source.
6. The electronic device of claim 5, wherein the angle between the polarization axis of the second linear polarizer and the fast axis of the second wave plate is 45 degrees.
7. The electronic device according to claim 6, wherein in a case where ambient light is right-handed polarized light after passing through the first filter layer, a polarization axis of the second linearly polarizing plate is in a first angular state;
in the case where the ambient light is left-hand polarized light after passing through the first filter layer, the polarization axis of the second linear polarizer is in a second angular state;
under the condition that the polarization axis of the second linear polarizer is in a first angle state, the polarization axis of the second linear polarizer rotates anticlockwise by 45 degrees and then is coincided with the fast axis of the second wave plate; and under the condition that the polarization axis of the second linear polarizer is in a second angle state, the polarization axis of the second linear polarizer is rotated by 45 degrees clockwise and then is coincided with the fast axis of the second wave plate.
8. The electronic device of claim 1, wherein the first light-sensitive cell and the second light-sensitive cell are both light-sensitive sensors.
9. The electronic device of claim 1, further comprising:
and the euphotic layer is arranged on the surface of the first filter layer.
10. The electronic device of claim 1, further comprising:
the first photosensitive unit and the second photosensitive unit are arranged on the printed circuit board.
CN202010778169.5A 2020-08-05 2020-08-05 Electronic device Pending CN111917906A (en)

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Application publication date: 20201110