CN113820878A - Display panel, display device, and electronic apparatus - Google Patents

Display panel, display device, and electronic apparatus Download PDF

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Publication number
CN113820878A
CN113820878A CN202010560975.5A CN202010560975A CN113820878A CN 113820878 A CN113820878 A CN 113820878A CN 202010560975 A CN202010560975 A CN 202010560975A CN 113820878 A CN113820878 A CN 113820878A
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CN
China
Prior art keywords
light
layer
display panel
unit
display
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Pending
Application number
CN202010560975.5A
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Chinese (zh)
Inventor
蔡奇
黄宗兴
彭旭
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN202010560975.5A priority Critical patent/CN113820878A/en
Priority to PCT/CN2021/085450 priority patent/WO2021204093A1/en
Publication of CN113820878A publication Critical patent/CN113820878A/en
Pending legal-status Critical Current

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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
    • G02F1/13338—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
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • 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
    • G02F1/133528—Polarisers
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/011—Arrangements for interaction with the human body, e.g. for user immersion in virtual reality
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0412—Digitisers structurally integrated in a display
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers

Abstract

The embodiment of the application discloses a display panel, a display device and electronic equipment, wherein the display panel comprises a display area; the display panel includes: a light sensor and a plurality of sub-pixels disposed in the display area; the display panel comprises a light sensing device layer and a display layer, wherein the sub-pixels are arranged in the display layer; the light sensor layer is independent of the display layer, and the light sensor is arranged in the light sensor layer; the light sensor includes: the device comprises a transmitting unit and a receiving unit, wherein the transmitting unit is used for transmitting infrared light to the environment of the display panel, and the receiving unit is used for receiving reflected light reflected by a measured object; the vertical projection of the emitting unit and the receiving unit on the display layer is positioned in the sub-pixel projection gap. Therefore, the light sensor is arranged in the gap of the sub-pixel projection, the non-display area can be reduced, and the screen occupation ratio of the electronic equipment is improved. Meanwhile, the light ray sensor can be prevented from shielding the sub-pixel light path.

Description

Display panel, display device, and electronic apparatus
Technical Field
The embodiment of the application relates to the technical field of display, in particular to a display panel, a display device and electronic equipment.
Background
With the development of diversification of functions of electronic devices, such as mobile phones, a variety of devices for implementing different functions, such as a light sensor, are integrated in the mobile phone, and the brightness of a screen of the mobile phone and a keyboard lamp can be adjusted according to light of an external environment where the mobile phone is located.
Fig. 1 is a schematic structural diagram of an electronic device. As shown in fig. 1, the electronic device 01 includes a display panel 10 and a light sensor 20. The display panel 10 has a display area 100 for displaying an image, and a non-display area 1001. The light sensor 20 is disposed in the non-display area 1001.
The electronic equipment needs to reserve a non-display area on the display panel, so that the screen occupation ratio of the electronic equipment is reduced.
Disclosure of Invention
The embodiment of the application provides a display panel, a display device and electronic equipment, which are used for reducing the non-display area of the display panel and improving the screen occupation ratio of the electronic equipment.
In a first aspect of embodiments of the present application, a display panel is provided, which includes a display area; the display panel includes: a light sensor and a plurality of sub-pixels disposed in the display area; the display panel comprises a light sensing device layer and a display layer, wherein the sub-pixels are arranged in the display layer; the light sensor layer is independent of the display layer, and the light sensor is arranged in the light sensor layer; the light sensor includes: the device comprises a transmitting unit and a receiving unit, wherein the transmitting unit is used for transmitting infrared light to the environment of the display panel, and the receiving unit is used for receiving reflected light reflected by a measured object; the vertical projection of the emitting unit and the receiving unit on the display layer is positioned in the sub-pixel projection gap. Therefore, compared with the traditional mode of arranging the light sensor in the non-display area, the light sensor is arranged in the gap of the sub-pixel projection, so that the non-display area can be reduced, and the screen occupation ratio of the electronic equipment is improved. Meanwhile, the light sensor can be prevented from blocking the light path of the sub-pixel, and the original light path of the display is not influenced.
Optionally, the display panel further includes: a substrate; an encapsulation layer, the display layer comprising: a light emitting layer disposed between the substrate and the encapsulation layer, the light emitting layer comprising: a plurality of active light emitting sub-pixels. Thus, the light sensor can be used in an OLED screen.
Optionally, the display panel further includes: a substrate; encapsulation layer the display layer set up in the base plate with between the encapsulation layer, the display layer includes: the liquid crystal layer and the filter film arranged on the liquid crystal layer, wherein the filter film comprises the sub-pixels. Thus, the light sensor may be used in an LCD screen.
Optionally, the transmitting unit and the receiving unit are disposed on the same layer, and are disposed on the substrate or the encapsulation layer; or the transmitting unit and the receiving unit are arranged in different layers and are respectively arranged on the substrate or the packaging layer. Therefore, the vertical projection of the light sensor on the display layer can be conveniently positioned in the gap of the sub-pixel, and the interference of the light sensor on the light path of the sub-pixel is avoided. The transmitting unit and the receiving unit are arranged in different layers, so that mutual interference of optical paths of the transmitting unit and the receiving unit can be avoided.
Optionally, the display panel further includes a touch layer; the touch layer is arranged on one side of the packaging layer far away from the substrate; the transmitting unit and the receiving unit are arranged on the touch layer. Therefore, the vertical projection of the light sensor on the display layer can be conveniently positioned in the gap of the sub-pixel, and the interference of the light sensor on the light path of the sub-pixel is avoided.
Optionally, the display panel further includes an upper polarizer; the upper polaroid is arranged on one side of the packaging layer far away from the substrate; the transmitting unit and the receiving unit are arranged on one side surface of the upper polaroid, which is far away from the substrate. Therefore, the vertical projection of the light sensor on the display layer can be conveniently positioned in the gap of the sub-pixel, and the interference of the light sensor on the light path of the sub-pixel is avoided.
Optionally, the display panel further comprises a cover plate; the cover plate is arranged on one side of the packaging layer far away from the substrate; the transmitting unit and the receiving unit are arranged on one side surface of the cover plate close to the substrate. Therefore, the vertical projection of the light sensor on the display layer can be conveniently positioned in the gap of the sub-pixel, and the interference of the light sensor on the light path of the sub-pixel is avoided.
Optionally, the transmitting unit includes: the infrared light emitting device comprises an emission control circuit and a light emitting element connected with the emission control circuit, wherein the emission control circuit is used for receiving an electric signal sent by a peripheral circuit and triggering the light emitting element according to the electric signal so that the light emitting element emits infrared light. The light emitting device of the display panel may emit visible light, for example. Thereby, the light waves emitted by the emission unit and the light waves emitted by the light emitting devices of the display panel can be distinguished.
Optionally, the display panel further includes a first light blocking structure; the first light blocking structure is arranged on one side where the light-emitting surface of the light-emitting element is located, and is arranged around the circumference of the light-emitting element. The emission intensity of the light emitting element varies depending on the emission direction. When the direction angle is zero degrees, its emission intensity is defined as 100%, and when the direction angle is larger, its emission intensity is relatively decreased. Therefore, by arranging the first light blocking structure, the direction angle can be reduced, and the emission intensity of the light emitting unit can be improved. The included angle theta between the infrared light emitted by the light emitting element and the normal line of the light emitting surface of the light emitting element1The angle is 5-45 degrees, and the light-emitting surface of the light-emitting element is circular. In addition, the ratio of the radius R1 of the light incident surface of the light emitting element to the height H of the light blocking structure is R1/H1 ═ tan θ1And the angle theta is an included angle between the incident light and the normal of the light incident surface of the photosensitive element. Angle theta1In the range of 5-45 deg. Therefore, the emergent range of the emitted light is reduced, the emission intensity of the light-emitting unit is improved, and the detection result is more accurate.
Optionally, the receiving unit includes a photosensitive control circuit and a photosensitive unit connected to the photosensitive control circuit; the photosensitive unit is used for receiving reflected light reflected by a measured object, performing photoelectric conversion and generating an electric signal; the photosensitive control circuit is used for reading the electric signal and outputting the electric signal to a peripheral circuit. Therefore, the distance of the measured object can be acquired according to the electric signal so as to correspondingly adjust the brightness of the display panel.
Optionally, the receiving unit further includes a filter layer; the filter layer is arranged on the light incident surface of the light sensing unit; the filter layer is used for filtering the light rays incident to the photosensitive unit; the filter layer comprises a silicon oxide layer and a titanium oxide layer which are stacked. Therefore, the filter layer can be used for filtering the non-response wave band of the photosensitive unit by adjusting the layer number and the refractive index of the silicon oxide layer and the titanium oxide layer in the filter layer.
Optionally, the display panel further includes a second light blocking structure; the second light blocking structure is arranged on one side where the light incoming surface of the light sensing unit is located and arranged around the periphery of the light sensing unit. Therefore, light emitted by the display panel can be shielded, and interference of the light on the acquisition result of the photosensitive control circuit is avoided. Wherein a ratio of the radius R2 of the light incident surface of the light sensing unit to the height H2 of the second light blocking structure is R2/H2 ═ tan θ2，θ2The angle of the angle is 5-45 degrees. Therefore, the incident range of incident light is reduced, and the incidence of non-detection light is avoided, so that the detection result is more accurate.
In a second aspect of the embodiments of the present application, a display device is provided, which includes the display panel as described above, and the display device adopts the display panel as described above, so that the screen occupation ratio is improved.
In a third aspect of the embodiments of the present application, there is provided an electronic device, comprising a processor, and the display panel as described above, the processor being in signal connection with the transmitting unit and the receiving unit; the processor is used for calculating the distance between the display panel and the object to be measured according to the infrared light emitted by the emitting unit and the reflected light received by the receiving unit, and adjusting the brightness of the display panel according to the distance between the display panel and the object to be measured. Therefore, misoperation of the mobile phone screen by the user can be reduced.
Drawings
FIG. 1 is a schematic diagram of an electronic device;
fig. 2 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;
fig. 2a is a schematic diagram illustrating a position of a light sensor according to an embodiment of the present disclosure;
fig. 2b is a schematic structural diagram of another electronic device provided in the embodiment of the present application;
fig. 2c is a schematic structural diagram of another electronic device provided in the embodiment of the present application;
fig. 3 is a schematic structural diagram of an optical line sensor according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a transmitting unit according to an embodiment of the present disclosure;
fig. 4a is a schematic structural diagram of a light emitting device according to an embodiment of the present disclosure;
fig. 4b is a schematic structural diagram of a first light blocking structure according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a receiving unit according to an embodiment of the present disclosure;
fig. 5a is a schematic structural diagram of a photosensitive element according to an embodiment of the present disclosure;
fig. 5b is a schematic structural diagram of a second light blocking structure according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another display panel provided in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings.
In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
Further, in the present application, directional terms such as "upper" and "lower" are defined with respect to a schematically-disposed orientation of components in the drawings, and it is to be understood that these directional terms are relative concepts that are used for descriptive and clarity purposes and that will vary accordingly with respect to the orientation in which the components are disposed in the drawings.
The embodiment of the application provides an electronic equipment, and the electronic equipment can be products that have display interface such as cell-phone, display, panel computer, on-vehicle computer to and intelligent display such as intelligent wrist-watch, intelligent bracelet dress products.
The embodiment of the present application does not specifically limit the specific form of the electronic device. For convenience of description, the following embodiments are all exemplified by taking the electronic device 01 shown in fig. 2 as a mobile phone.
In one implementation of the present application, the electronic device 01, as shown in fig. 2, has a display device including at least a display panel 10 and a light sensor 20. The display panel 10 has a display area 100 for displaying an image, and a frame area 1002 located at the periphery of the display area 100. The frame region 1002 is provided with a driving circuit for driving the display panel 10 to display a screen, for example, a source driving circuit, a gate driving circuit, and the like.
In which, for example, a pixel unit 30 is further disposed in the display area 100, in some embodiments of the present application, the display panel includes: a display layer in which the pixel unit 30 is disposed, for example. The pixel arrangement of the pixel unit 30 can be as shown in fig. 2a, and one pixel unit 30 includes one red (R) sub-pixel R, one green (G) sub-pixel G, and one blue (B) sub-pixel B.
For example, as shown in fig. 2a, the red, green and blue sub-pixels R, G and B are located in the same row along the X-direction, and the red sub-pixel R is located in the same column along the Y-direction.
Fig. 2a illustrates an example of the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B being located in the same row along the X-axis direction in the same pixel unit 30. In other embodiments of the present application, the red sub-pixel R and the green sub-pixel G in the same pixel unit 30 may be located in the same row along the X-axis direction, and the blue sub-pixel B is located in the next row, or the green sub-pixel G and the blue sub-pixel B may be located in the same row along the X-axis direction, and the red sub-pixel R is located in the next row.
It should be noted that the arrangement of the primary color sub-pixels of red, green and blue may be determined as needed, and the present application does not limit the arrangement.
With any of the above pixel arrangements, the gap between any two adjacent sub-pixels may not be used for displaying an image.
In general, during a call, the display panel 10 is close to the ear of a user, the display panel 10 cannot be seen by the sight of the user, and the display panel 10 of the mobile phone is always on during the call, and if the call of the user is long, the power consumption of the mobile phone is large.
Based on this, the electronic device 01 provided in the embodiment of the present application may further include a light sensor 20 as in fig. 2 a. The light sensor 20 is, for example, a proximity light sensor. The light sensor 20 includes: a transmitting unit 201 and a receiving unit 202, the transmitting unit 201 is used for transmitting infrared light, for example, infrared light with a wavelength of about 850nm, to the environment of the display panel 10, and the receiving unit 202 is used for receiving the reflected light reflected by the measured object.
The electronic device further comprises, for example, a processor, which is in signal connection with the transmitting unit 201 and the receiving unit 202, respectively. The processor is configured to calculate a distance between the display panel 10 and the object to be measured according to the infrared light emitted by the emitting unit 201 and the reflected light received by the receiving unit 202, for example, by measuring a time from the emission of the light pulse to the emission of the light pulse back from the object to be measured, and calculating the distance between the light pulse and the object by a time interval. And adjusting the brightness of the display panel or controlling the on/off of the display panel according to the distance between the display panel 10 and the object to be measured.
During operation, infrared light emitted by the emitting unit 201 is reflected to the infrared light receiving sensor via the approaching object, and the processor determines the distance from the approaching object to the sensor according to the intensity of the received infrared light, so that the object can be sensed. When the user is in a call, the light sensor 20 can detect the distance between the body part of the user and the display panel 10, when the distance is smaller than a preset value, the screen is closed, so that the power consumption of the electronic device 01 can be reduced, and meanwhile, for a touch screen mobile phone, the misoperation of the user on the screen of the mobile phone by ears or hands can be reduced.
In addition, in the use of the fingerprint under the screen, the light sensor 20 can determine the distance between the finger of the user and the display panel 10 in time, so that the fingerprint under the screen can be awakened in time to prepare for rapidly starting the identification process, otherwise, the fingerprint is kept in a sleep state, and the power consumption is further reduced.
The light sensor 20 is usually made of an opaque material, so as to avoid that the sub-pixels of the display panel 10 and the light sensor 20 shield each other, affect the normal display of the display panel 10, or interfere the sensitivity of the light sensor 20, the vertical projections of the emitting unit 201 and the receiving unit 202 in the light sensor 20 on the display layer may be located in the gaps of the sub-pixels.
The light sensor 20 may be disposed on the same layer as the pixel unit, or may be disposed on a different layer. In the application, the layer for placing the light sensor is called a light sensing device layer, and when the transmitting unit and the receiving unit of the light sensor are arranged on the same layer, the light sensing device layer is a layer; when the emitting unit and the receiving unit of the light sensor are arranged in different layers, the light sensation device layers are two layers. The light sensing device layer may be a virtual concept, i.e. it is arranged within other layers (non-display layers), e.g. in the touch layer, not a separate layer; or may be a separate layer, for example located between two layers. In some embodiments of the present application, the light sensor 20 may be placed on the same layer as the display driving unit of the pixel unit, for example. The specific position of the light sensor 20 is not limited in this application, and it is only necessary that the vertical projections of the emitting unit 201 and the receiving unit 202 in the light sensor 20 on the display layer can be located in the gap of the sub-pixel.
Therefore, compared with the traditional mode of arranging the light sensor in the non-display area, the light sensor is arranged in the gap issued by the sub-pixel, so that the non-display area can be reduced, and the screen occupation ratio of the electronic equipment is improved. Meanwhile, the light ray sensor can be prevented from blocking the light path of the sub-pixel.
Of course, in other implementations of the present application, the light sensor 20 may also be made of a transparent material, in this case, the light sensor 20 may be disposed in a stack above the sub-pixels, and the projection of the emitting unit 201 and the receiving unit 202 in the light sensor 20 on the display area 100 may be partially or completely overlapped with the projection of the sub-pixels on the display area, but the light sensor and the sub-pixels are independent, so that the amount of light blocked by the sensor (the device itself and the sensor control circuit) can be reduced, and the influence of the light sensor on the optical path of the sub-pixels can also be reduced, and the screen display effect is not reduced while the light detection function is implemented. All falling within the scope of protection of the present application.
The embodiment of the present application does not limit the specific position and number of the light sensors 20, and in another implementation manner of the present application, the number of the light sensors 20 is four, and the four adjacent light sensors can be respectively set at positions corresponding to four top corners of the display panel 10 as shown in fig. 2 b.
Or, in other embodiments of the present application, as shown in fig. 2c, the number of the light sensors 20 is eight, and four light sensors 20 may be respectively disposed on two sides of the display panel 10, at this time, the light sensors 20 may not only test the light intensity and adjust the brightness of the display panel 10, but also detect the hand shielding position, so as to determine the operation performed by the hand. For example, whether the screen needs to be turned off or not is determined according to the distance between the face of the user and the mobile phone during the call, and whether the user runs or normally uses the holding posture during the use of the user is determined; whether the mobile phone is in a local shielded state can be judged for matching the use of the fingerprint sensor and/or the front camera, and the like.
The embodiment of the present application does not limit the specific structure of the transmitting unit 201. In one implementation of the present application, as shown in fig. 4, the transmitting unit 201 includes: the emission control circuit 2011 is configured to receive an electrical signal sent by a peripheral circuit, and trigger the light emitting element 2012 according to the electrical signal, so that the light emitting element 2012 emits infrared light.
The emission control circuit 2011 may employ a first switching transistor, wherein the first switching transistor may be a Thin Film Transistor (TFT) or a MOS transistor. For convenience of explanation, the first switching transistor is taken as an example of a TFT.
In the embodiment of the present application, the first switching transistor may include a first electrode 11, a first gate (gate, g)13, a first active layer 14, and a second electrode 16.
The first electrode 11 is connected to a first pole (e.g., a source) of the first active layer 14, the second electrode 16 is connected to a second pole (e.g., a drain) of the first active layer 14, and the first gate electrode 13 is used for receiving an electrical signal sent by a peripheral circuit, where the electrical signal can control the conduction of the first switching transistor.
In order to avoid the emission control circuit 2011 from being damaged by external light, the display panel 10 may further include a light shielding layer 12, wherein the light shielding layer 12 is located on a side of the first gate 13 of the switching transistor away from the first active layer 14 of the switching transistor, and the light shielding layer 12 covers the first gate 13 of the switching transistor.
In view of this, in some embodiments of the present application, as shown in fig. 4a, the light emitting element 2012 has a light emitting layer 15 as shown in fig. 4, and one end of the light emitting layer 15 is connected to the second electrode 16, and the other end is connected to the third electrode 17.
In this case, when the first gate 13 controls the first active layer 14 to be turned on, the second electrode 16 and the third electrode 17 on both sides of the light emitting layer 15 are turned on, and carriers in the second electrode 16 and the third electrode 17 meet in the light emitting layer 15 and excite photons, thereby causing the light emitting layer 15 to emit light. The light-emitting layer 15 may be a PN junction light-emitting system or a PIN structure, and the light-emitting layer 15 may emit infrared light, for example.
In this application, the light-emitting element 2012 adopts a PN junction as an example, wherein the emission control circuit 2011 is electrically connected to the light-emitting element 2012, which means that the light-emitting layer 15 of the light-emitting element 2012 is connected to the first active layer 14 of the switching transistor through the second electrode 16.
The infrared emission material of the light-emitting element 2012 may be gallium arsenide (GaAs), gallium aluminum arsenide (GaAlAs); organic infrared emitting coatings, such as doped fluorescent materials, may also be employed, with emission in the wavelength range of 600-1000 nm.
In operation, the emission control circuit 2011 is configured to receive an electrical signal sent by a peripheral circuit, and trigger the light emitting element 2012 according to the electrical signal, so that the light emitting element 2012 emits infrared light.
Further, the emission intensity of the light emitting element 2012 varies depending on the emission direction. It should be noted that the emission direction is the angle between the emitted light and the normal.
When the direction angle is zero degrees, its emission intensity is defined as 100%, and when the direction angle is larger, its emission intensity is relatively decreased. In the embodiment of the application, the detection distance of the proximity light sensor is usually 10-20cm, and the emission intensity of the infrared light emitted by the light emitting unit within the detection distance needs to be greater than a preset value. In order to solve the above problem, the display panel 10 may further include a first light blocking structure 209 as shown in fig. 4, where the first light blocking structure 209 is disposed on a side where the light emitting surface of the light emitting element 2012 is located, and is disposed around the light emitting element 2012 for a circle (as shown in fig. 4 b), so that the direction angle can be reduced, and the emission intensity of the light emitting unit can be improved.
The application does not limit the specific structure of the first light blocking structure. In some embodiments of the present application, the light emitting surface of the light emitting element 2012 may be circular as shown in fig. 4b, and at this time, as shown in fig. 4a, a ratio of a radius R1 of the light emitting surface of the light emitting element 2012 to a height H1 of the first light blocking structure 209 is R1/H1 ═ tan θ ═ θ1When the angle theta1When the angle is within the range of 5-45 degrees, the emergent range of the emitted light can be reduced, so that the light is more concentrated, and the detection result is more accurate. Wherein the angle theta1Is the angle between the emitted light and the normal of the light-emitting surface of the light-emitting element. For example, in some embodiments of the present application, the angle θ is described above1Can be 5 degrees, 10 degrees, 15 degrees, 20 degrees and 30 degreesOr 45.
The embodiment of the present application does not limit the specific structure of the receiving unit 202. In one implementation of the present application, as shown in fig. 5, the receiving unit 202 includes a photosensitive control circuit 2021 and a photosensitive unit 2022 connected to the photosensitive control circuit 2021.
The photosensitive unit 2022 is configured to receive reflected light reflected by an object to be measured, perform photoelectric conversion, and generate an electrical signal, and the photosensitive control circuit 2021 is configured to read the electrical signal and output the electrical signal.
The light reception control circuit 2021 may have the same configuration as the emission control circuit 2011, for example.
As shown in fig. 5, the photosensitive unit 2022 includes: a second gate electrode 27, a photosensitive material 25, and a second active layer 26.
The second gate 27 is used for controlling the on/off of the second active layer 26, and one end of the second active layer 26 is connected to the fourth electrode 21, and the other end is connected to the second electrode 16 of the photosensitive control circuit 2021.
In operation, when light is emitted to the surface of the photosensitive unit 2022, a photoelectric conversion effect occurs in the photosensitive layer 26 of the photosensitive unit 2022, so that the impedance of the photosensitive layer 26 of the photosensitive unit 2022 changes, and charge accumulation or charge consumption is formed at two ends of the photosensitive layer 26 of the photosensitive unit 2022 (as shown in fig. 5, the left side of the photosensitive layer 26 is positive charge, and the right side is negative charge).
Under the action of the electric field, a current can be formed between charges accumulated at two ends of the photosensitive layer 26 of the photosensitive unit 2022 (as shown in fig. 5, the direction of the current is the direction in which positive charges point to negative charges), and when the second gate 27 controls the second active layer 26 to be opened, the photosensitive unit 2022 outputs an electric signal.
Therefore, as can be seen from the above description, when the light enters the surface of the photosensitive unit 2022, the light is converted into an electrical signal, however, the light of the non-target wavelength band in the external light enters the surface of the photosensitive unit 2022, and the photosensitive unit 2022 is prone to cause a false response. So as to solve the above problems. In some embodiments of the present application, as shown in fig. 5, display panel 10 may further include filter layer 25.
The filter layer 25 is disposed on one side of the light incident surface of the light sensing unit 2022 and covers the light incident surface of the light sensing unit 2022, and the filter layer 25 is used for filtering light incident to the display panel 10, thereby filtering a non-response band of the light sensing unit 2022 and improving accuracy of light signal acquisition of the light sensing control circuit 2021.
The filter layer 25 may include a silicon oxide (SiOx) layer and a titanium oxide (TiOx) layer stacked together, and the light wavelength band that the filter layer 25 can filter is adjusted by adjusting the number and refractive index of the silicon oxide (SiOx) layer and the titanium oxide (TiOx). For example, when the photosensitive element in the photosensitive control circuit 2021 does not respond to the infrared wavelength band, the filter layer 25 may filter out light in a non-target wavelength band by adjusting the number and refractive index of the silicon oxide (SiOx) layer and the titanium oxide (TiOx).
It should be noted that, the number of layers, the stacking manner, and the refractive index of SiOx and TiOx are not limited in this application, and those skilled in the art can set the number of layers, the stacking manner, and the refractive index of SiOx and TiOx through experiments, tests, simulations, and the like, as long as the nonresponsive wavelength band can be filtered according to the requirement of the photosensitive unit 2022 on the wavelength of light.
Furthermore, it can be seen from the above that each photosensitive unit 2022 of the photosensitive unit 2022 is located in the gap between two adjacent sub-pixels, however, the pixel unit composed of the sub-pixels can display an image, and when the pixel unit displays an image, there is a possibility that light emitted by the pixel unit is incident on the gap between the sub-pixels, thereby affecting the acquisition result of the photosensitive unit 2022. In order to solve the above problem, the display panel 10 may further include a second light-blocking structure 208 as shown in fig. 5a, where the second light-blocking structure 208 is disposed on a side where the light-incident surface of the light-sensing unit 2022 is located, and is disposed around a circumference of the light-sensing unit 2022 (as shown in fig. 5 b), so as to block the light of the sub-pixel from being incident on the light-sensing unit 2022.
In some embodiments of the present application, the light incident surface of the light sensing unit 2022 may be circular as shown in fig. 5b, and at this time, as shown in fig. 5a, the radius R2 of the light incident surface of the light sensing unit 2022 and the height of the second light blocking structure 208 areThe ratio of H2 is R2/H2 ═ tan theta2When the angle theta2When the angle is within the range of 5-45 degrees, the incident range of incident light can be narrowed, and the incidence of non-detection light is avoided, so that the detection result is more accurate. Wherein the angle theta2Is the angle between the incident light and the normal of the light-incident surface of the photosensitive element, such as the photosensitive unit 2022. For example, in some embodiments of the present application, the angle θ is described above2May be 5 °, 10 °, 15 °, 20 °, 30 °, or 45 °.
The following describes a process of manufacturing the photosensor 20 in the display panel 10 with reference to fig. 3. In this embodiment, the optical sensor 20 includes an emitting unit 201 and a receiving unit 202, and the emitting unit 201 and the receiving unit 202 are integrated together, so that deposition or sputter coating of a semiconductor process can be normally performed on a substrate.
First, on a substrate 203 (for example, a flexible substrate such as a polyimide PI substrate, or a rigid substrate such as a glass substrate), a buffer layer 204 is formed by Chemical Vapor Deposition (CVD), and then, a first active layer 14 of an emission control circuit 2011 and a photosensitive control circuit 2021 is formed on a surface of the buffer layer 204 on a side away from the substrate 203 by Physical Vapor Deposition (PVD).
Then, a gate insulating layer 205 is formed over the substrate with the buffer layer 204 formed thereon by a CVD process. The gate insulating layer 205 covers the first active layer 14 of the switching transistor. Next, the first gate 13 of the emission control circuit 2011 and the light sensing control circuit 2021 and the second gate 27 of the light sensing unit 2022 may be simultaneously formed by a PVD process on a surface of the gate insulating layer 205 on a side away from the substrate 203. Thereafter, an intermediate layer 206 is formed overlying the first gate 302 and the second gate 27 using a CVD process.
After that, the first electrode 11, the second electrode 16, the third electrode 17, and the fourth electrode 21 are formed, respectively.
Next, a light shielding layer 12 is formed between the first electrode 11 and the second electrode 16, and the light shielding layer 12 is connected to the first electrode 11 and the second electrode 16, wherein the material constituting the light shielding layer 12 may be a black light absorbing material (e.g. black photoresist) or a metal with an insulated surface coating (e.g. aluminum (Al), titanium (Ti), etc.), and may be prepared by photolithography or metal sputtering, respectively.
Then, the photosensitive layer 26 of the photosensitive element and the luminescent layer 15 of the luminescent element 2012 are formed, respectively. The material constituting the photosensitive layer 26 and the light emitting layer 15 may be a conventional semiconductor material, such as polysilicon, amorphous silicon, etc., and may be prepared by a CVD process, or an organic semiconductor material, such as pentacene, isopropylsilalkynyl pentacene, etc., and may be prepared by photolithography and coating methods.
Next, in order to ensure the accuracy of collecting the optical signal by the photosensitive control circuit 201, as shown in fig. 3, a filter layer 25 may be formed on the surface of the photosensitive layer by a CVD process to filter out the non-response wavelength band.
Thereafter, the filter layer 25 is covered by a passivation layer 207, and a second light blocking structure 208 and a first light blocking structure 209 are formed on the passivation layer 207, wherein the material constituting the second light blocking structure 208 and the first light blocking structure 209 may be a black light absorbing material (e.g., black photoresist) or a metal (e.g., aluminum (Al), titanium (Ti), etc.) with an insulated surface coating, and also, may be prepared by using a photolithography method or a metal sputtering method, respectively.
As can be seen from the above, in the embodiment of the present application, the display panel 10 may include a plurality of proximity optical sensors and a plurality of pixel units disposed in the display area. In this case, the proximity photosensor is located between the effective display areas of the adjacent two pixel units. Based on this, the transmitting unit 201 includes: an emission control circuit 2011 and a light emitting element 2012 connected to the emission control circuit 2011, wherein the emission control circuit 2011 is configured to receive an electrical signal sent by a peripheral circuit and trigger the light emitting element 2012 according to the electrical signal, so that the light emitting element 2012 emits infrared light, and the receiving unit 202 includes a photosensitive control circuit 2021 and a photosensitive unit 2022 connected to the photosensitive control circuit 2021; the photosensitive unit 2022 is configured to receive reflected light reflected by the object 001 to be measured, perform photoelectric conversion, and generate an electrical signal; the photosensitive control circuit 2021 is configured to read the electrical signal and output the electrical signal. Thereby can adjust display panel 10's luminance according to the signal of telecommunication who acquires, prevent that the user from touching by mistake, simultaneously, compare with traditional will be close the mode that light sensor set up in bang district, because this is close light sensor and sets up in display panel 10's effective display area, can need not to set up the recess specially, consequently, can reduce display panel 10's bang region to improve electronic equipment 01's screen and account for than.
The above is a description of a specific configuration of the photosensor 20, and the configuration of the display panel 10 including the light reception control circuit 2021 will be described below as an example.
In one implementation of the present application, the display panel 10 is a self-luminous display panel.
As shown in fig. 6, the self-luminous display panel may have a plurality of sub-pixels arranged in an array. In addition, the display panel 10 described above includes a pixel circuit and a light emitting device within the sub-pixel. The pixel circuit drives the light emitting device to emit light so that each sub-pixel in the display panel 10 can perform display according to a preset gray scale.
In some embodiments of the present application, the light emitting device may be an Organic Light Emitting Diode (OLED). Alternatively, in other embodiments of the present application, the light emitting device may be a micro Light Emitting Diode (LED), such as a micro LED, or a mini LED. The present application does not limit the type of the light emitting device as long as the light emitting device can emit light under the driving of the pixel circuit. For convenience of description, the following description will be given by taking the light emitting device as an OLED as an example.
In this case, the display panel 10 may further include a substrate 101 and a light emitting layer 102 disposed on the substrate 101, as shown in fig. 6, and the light emitting device is disposed on the light emitting layer 102.
In addition, as shown in fig. 6, the display panel 10 may further include an encapsulation layer 103. The encapsulation layer 103 is disposed on a side of the light emitting device away from the substrate 101, and is used to prevent water and oxygen in the air from entering the light emitting device and causing adverse effects on the light emitting device.
Based on this, in some embodiments of the present application, the display panel 10 may be a flexible display panel 10. At this time, the material constituting the substrate 101 may be a flexible material, such as an organic material. The encapsulation layer 103 may be an encapsulation layer including a multi-layer organic thin film encapsulation layer for serving as a flexible substrate and a multi-layer inorganic thin film encapsulation layer for blocking water and oxygen. The organic film packaging layer and the inorganic film packaging layer are arranged in a crossed mode, and the layer of film, close to the air and the light-emitting device, of the packaging layer is the inorganic film packaging layer. Alternatively, in other embodiments of the present application, when the display panel 10 is a rigid display panel 10, the materials of the substrate 101 and the encapsulation layer 103 may be both rigid transparent materials. Such as glass, sapphire, hard resin material, etc. In this case, the encapsulation layer 103 may be an encapsulation cover plate.
In this case, in order to avoid the interference of the light sensor 20 on the optical path of the pixel, the light sensor 20 may be located between the effective display areas of two adjacent sub-pixels, which are the positions corresponding to the light emitting devices, as can be seen from the above description. In order to make the light sensor 20 located between the effective display areas of two adjacent sub-pixels, the projection of the light sensor 20 on the encapsulation layer 103 is located in the gap of the projection of the pixel unit on the encapsulation layer 103.
In some embodiments of the present application, the light sensor 20 may be disposed on a side surface of the substrate 101 near the light emitting device in fig. 6.
The switching transistor in the light sensor 20 and the transistor in the pixel circuit may or may not be shared (the scheme shown in the figure is not shared), and may be set according to the requirement, which is not limited in the present application. When the switching transistor in the light sensor 20 and the transistor in the pixel circuit are shared, both the pixel and the light sensor 20 can be controlled by the pixel circuit. When the power supply is not shared, the on-off frequency of the switching transistor can be set according to the frequency of data acquired as required, so that the purpose of reducing power consumption is achieved. When the emitting unit and the pixel unit of the light sensor are on the same layer, the influence of the emitted light on the TFT circuit of the OLED can be effectively blocked by limiting the emitting angle of the emitting unit; an infrared emitting unit having a slightly longer emission wavelength (for example, around 1300 nm) may be selected as a light source, and the TFT circuit of the conventional OLED is not excited. At present, gaps between sub-pixels of a conventional screen are 20-30um, and 20um openings can be avoided by metal wiring for photosensitive units in the screen; the receiver (photosensitive unit) in the proximity optical sensor can normally perform the detection function only by ensuring the minimum photosensitive area of 20 um; the number of receivers can be increased and/or the photosensitive area increased if needed to increase sensitivity.
In other embodiments of the present application, the light sensor 20 may be disposed on a surface of the encapsulation layer 103 away from the substrate 101. In order to avoid interference of the light sensor 20 on the optical path of the pixel, the projections of the emitting unit 201 and the receiving unit 202 on the encapsulation layer 103 are located in the gap of the projection of the pixel on the encapsulation layer 103. Of course, a light sensor with good light transmittance or even transparency may be used to further reduce the influence on the display effect.
In this embodiment, the photosensitive element may also be configured as the photosensitive unit 2022, the photodiode VD, or the photo resistor, and regarding the configuration manner of the light sensor 20, compared to the manner that the light sensor 20 is disposed on the surface of the substrate 101 near the light emitting device, only the substrate 101 is replaced with the encapsulation layer 103, which is the same as the above, and the specific configuration is the same as above, and is not described here again.
In other embodiments of the present application, the light sensor 20 may be disposed on a surface of the light emitting layer 102 away from the substrate 101. In order to avoid interference of the light sensor 20 with the optical path of the pixel, the vertical projection of the light sensor 20 on the substrate 101 needs to be located in the gap of the projection of the pixel unit on the substrate 101.
In this embodiment, the photosensitive element may also be configured as the photosensitive unit 2022, the photodiode VD, or the photo resistor, and regarding the configuration of the light sensor 20, compared to the configuration of the light sensor 20 disposed on the side surface of the substrate 101 close to the light emitting device, only the substrate 101 is replaced with the light emitting layer 102, which is the same as the above configuration, and therefore, the detailed description thereof is omitted here.
In other embodiments of the present disclosure, as shown in fig. 6, the display panel 10 may further include a touch layer 104, the touch layer 104 is disposed on a side of the encapsulation layer 103 away from the substrate 101, and in this case, the light sensor 20 may be disposed on the touch layer 104. In order to avoid interference of the light sensor 20 on the optical path of the pixel, the projections of the emitting unit 201 and the receiving unit 202 on the encapsulation layer 103 are located in the gap of the projection of the pixel on the encapsulation layer 103.
In this embodiment, the photosensitive element may also be configured as the photosensitive unit 2022, the photodiode VD, or the photo resistor, and regarding the configuration manner of the light sensor 20, compared to the configuration manner of the light sensor 20 disposed on the side surface of the substrate 101 close to the light emitting device, only the substrate 101 is replaced with the touch layer 104, which is the same as the above, and the specific configuration is the same as above, and is not described here again.
In other embodiments of the present application, as shown in fig. 6, the display panel 10 may further include an upper polarizer 105, the upper polarizer 105 is disposed on a side of the encapsulation layer 103 away from the substrate 101, and in this case, the light sensor 20 may be disposed on a surface of the upper polarizer 105 away from the substrate 101. In order to avoid interference of the light sensor 20 on the optical path of the pixel, the projections of the emitting unit 201 and the receiving unit 202 on the encapsulation layer 103 are located in the gap of the projection of the pixel on the encapsulation layer 103.
In this embodiment, the photosensitive element may also be configured as the photosensitive unit 2022, the photodiode VD, or the photosensitive resistor, and regarding the configuration manner of the light sensor 20, compared to the manner that the light sensor 20 is disposed on the side surface of the substrate 101 close to the light emitting device, only the substrate 101 is replaced with the upper polarizer 105, which is the same as the above, and the specific configuration is the same as above, and is not described here again.
In other embodiments of the present application, as shown in fig. 6, the display panel 10 further includes a cover 106, the cover 106 is disposed on a side of the encapsulation layer 103 away from the substrate 101, in which case, the light sensor 20 may be disposed on a surface of the cover 106 close to the substrate 101. In order to avoid interference of the light sensor 20 on the optical path of the pixel, the projections of the emitting unit 201 and the receiving unit 202 on the encapsulation layer 103 are located in the gap of the projection of the pixel on the encapsulation layer 103.
Note that, for example, the cover plate 106 is further provided with: in other embodiments of the present disclosure, the optical sensor 20 may be disposed between the cover 106 and the optical film layer, which falls within the scope of the present disclosure.
In this embodiment, the photosensitive element may also be set as the photosensitive unit 2022, the photodiode VD, or the photo resistor, and regarding the setting manner of the light sensor 20, compared to the above-mentioned manner in which the light sensor 20 is set on the side surface of the substrate 101 close to the light emitting device, only the substrate 101 is replaced by the cover 106, which is the same as the above, and the specific setting is the same as above, and is not described here again.
When the light sensor 20 is formed over the substrate 101, the manufacturing process is the same as the manufacturing process for forming the transistors in the pixel circuits over the substrate 101. The light sensor 20 and the pixel circuit can be simultaneously manufactured on the substrate 101, which facilitates the process production and simplifies the station change and the equipment change in the production process.
In the above embodiments, the transmitting unit 201 and the receiving unit 202 are integrated and disposed on the same layer of the display panel 10, and in other implementations of the present application, the transmitting unit 201 and the receiving unit 202 may also be disposed on different layers of the display panel 10.
For example, the emitting unit 201 may be disposed on the encapsulation layer 103, and the receiving unit 202 may be disposed on the substrate 101, and the projection of the emitting unit 201 and the receiving unit 202 on the light emitting layer 102 is separated.
Of course, the emitting unit 201 may be disposed on the encapsulation layer 103, and the receiving unit 202 may be disposed on the substrate 101, and the projection of the emitting unit 201 and the projection of the receiving unit 202 on the light emitting layer 102 are separated.
In addition, when the projections of the transmitting unit 201 and the receiving unit 202 in the vertical direction overlap, the light returned by the object to be measured 001 may be blocked by the transmitting unit 201, affecting the detection sensitivity.
In the embodiment of the present application, the projection of the emitting unit 201 and the projection of the receiving unit 202 on the light emitting layer 102 are separated, that is, the emitting unit 201 and the receiving unit 202 are not overlapped in the vertical direction (the thickness direction of the display panel), so that mutual interference between the emitting unit 201 and the receiving unit 202 can be avoided, and the detection sensitivity of the optical line sensor 20 is improved.
It should be noted that, when the substrate 101 is below the encapsulation layer 103, the transmitting unit 201 is disposed on the substrate 101, and the receiving unit 202 is disposed on the encapsulation layer 103, a part of infrared light emitted by the transmitting unit 201 is directly received by the receiving unit 202, which affects the sensitivity of detection, so that the detecting sensitivity can be further improved by disposing the transmitting unit 201 above the layer where the receiving unit 202 is located, and therefore, when the light sensor 20 is disposed, it is preferable to dispose the transmitting unit 201 above the layer where the receiving unit 202 is located.
The above description is only given by way of example of disposing the transmitting unit 201 and the receiving unit 202 on the substrate 101 and the encapsulation layer 103, respectively, and in other implementations of the present application, the transmitting unit 201 and the receiving unit 202 may be disposed on different layers, such as the touch layer 104, the upper polarizer 105, and the cover 106, respectively. It is only necessary to make the layer where the transmitting unit 201 is located higher than the layer where the receiving unit 202 is located, and these all belong to the protection scope of the present application.
Example two
In this example, the display panel 10 is a Liquid Crystal Display (LCD) panel. Since the lcd panel cannot emit light, a backlight unit (BLU) 109 is required to provide light to the lcd panel so that each sub pixel in the lcd panel can emit light, thereby displaying images.
The LCD may include a lower polarizer 110, a substrate 101, a Color Filter (CF) 108, and a liquid crystal layer 107 as shown in fig. 7. On the substrate 101, a pixel circuit (not shown) is provided in each sub-pixel. The pixel circuit may be configured to control a deflection angle of liquid crystal molecules in the liquid crystal layer 107 corresponding to a sub-pixel position where the pixel circuit is located, so as to control an amount of light provided by the BLU passing through the sub-pixel, thereby controlling the sub-pixel to display gray scale.
In addition, the LCD may further include an encapsulation layer 103 for preventing water and oxygen in the air from entering the liquid crystal layer 107 and damaging the liquid crystal molecules.
Based on this, in some embodiments of the present application, the display panel 10 may be a flexible display panel 10. At this time, the material constituting the substrate 101 may be a flexible material, such as an organic material. The encapsulation layer 103 may be an encapsulation layer including a multi-layer organic thin film encapsulation layer for serving as a flexible substrate and a multi-layer inorganic thin film encapsulation layer for blocking water and oxygen. The organic film packaging layer and the inorganic film packaging layer are arranged in a crossed mode, and the layer of film, close to the air and the light-emitting device, of the packaging layer is the inorganic film packaging layer. Alternatively, in other embodiments of the present application, when the display panel 10 is a rigid display panel 10, the materials of the substrate 101 and the encapsulation layer 103 may be both rigid transparent materials. Such as glass, sapphire, hard resin material, etc. In this case, the encapsulation layer 103 may be an encapsulation cover plate.
In this case, when the electronic device 01 has a function of adjusting the brightness of the display panel 10 according to the light, the electronic device 01 further includes a light sensor 20, and in order to avoid interference of the light sensor 20 with the optical path of the pixel, the projections of the emitting unit 201 and the receiving unit 202 on the substrate 101 are located in the gap between the projections of the pixel units on the substrate 101.
In some embodiments of the present application, as shown in fig. 7, the light sensor 20 may be disposed on a surface of the encapsulation layer 103 on a side away from the substrate 101.
In this example, the projections of the emitting unit 201 and the receiving unit 202 on the encapsulation layer 103 are located in the gap of the projections of the pixel units on the encapsulation layer 103.
In addition, in this example, the photosensitive element may also be configured as a photodiode VD or a photosensitive resistor, and at this time, in the above cross-sectional view of the display panel 10, only the photosensitive unit 2022 in fig. 7 is replaced by the photodiode VD or the photosensitive resistor, and the specific configuration is the same as that described above, and is not described here again.
In other embodiments of the present disclosure, as shown in fig. 7, the display panel 10 may further include a touch layer 104, the touch layer 104 is disposed on a side of the encapsulation layer 103 away from the substrate 101, in which case, the light sensor 20 may be disposed on the touch layer 104. In order to avoid interference of the light sensor 20 on the optical path of the pixel, the projections of the emitting unit 201 and the receiving unit 202 on the encapsulation layer 103 are located in the gap of the projection of the pixel on the encapsulation layer 103.
In this example, the photosensitive element may also be set as the photosensitive unit 2022, the photodiode VD, or the photo resistor, and regarding the setting manner of the light sensor 20, compared to the above-mentioned manner of setting the light sensor 20 on the surface of the side of the encapsulation layer 103 away from the substrate 101, only the encapsulation layer 103 is replaced by the touch layer 104, which is the same as the above, and the specific setting is the same as above, and is not repeated here.
In other embodiments of the present application, as shown in fig. 7, the display panel 10 may further include an upper polarizer 105, the upper polarizer 105 is disposed on a side of the encapsulation layer 103 away from the substrate 101, and in this case, the light sensor 20 may be disposed on a surface of the upper polarizer 105 away from the substrate 101. In order to avoid interference of the light sensor 20 on the optical path of the pixel, the projections of the emitting unit 201 and the receiving unit 202 on the encapsulation layer 103 are located in the gap of the projection of the pixel on the encapsulation layer 103.
In this embodiment, the photosensitive element may also be configured as the photosensitive unit 2022, the photodiode VD, or the photo resistor, and regarding the configuration manner of the light sensor 20, compared to the manner of configuring the light sensor 20 on the surface of the side of the encapsulation layer 103 away from the substrate 101, only the encapsulation layer 103 is replaced by the upper polarizer, which is the same as the above, and the specific configuration is the same as above, and is not described herein again.
In other embodiments of the present application, as shown in fig. 7, the display panel 10 may further include a cover 106, the cover 106 is disposed on a side of the encapsulation layer 103 away from the substrate 101, in this case, the light sensor 20 may be disposed on a surface of the cover 106 away from the substrate 101, and in order to avoid interference of the light sensor 20 on a light path of the pixel, a projection of the emitting unit 201 and the receiving unit 202 on the encapsulation layer 103 is located in a gap of the projection of the pixel on the encapsulation layer 103.
In this embodiment, the photosensitive element may also be set as the photosensitive unit 2022, the photodiode VD, or the photo resistor, and regarding the setting manner of the light sensor 20, compared to the above-mentioned manner of setting the light sensor 20 on the surface of the side of the encapsulation layer 103 away from the substrate 101, only the encapsulation layer 103 is replaced by the cover plate 106, which is the same as the above, and the specific setting is the same as above, and is not described here again.
It should be noted that, since the pixel circuit can control the deflection angle of the liquid crystal molecules in the liquid crystal layer 107, so that the amount of light passing through the sub-pixels is different, thereby achieving the purpose of controlling the gray scale displayed by the sub-pixels, the liquid crystal layer 107 is not transparent. Therefore, for convenience of manufacturing, when the display panel 10 is a liquid crystal display panel, the present application preferably considers that the light sensor 20 is disposed above the liquid crystal layer 107.
In the above embodiments, the transmitting unit 201 and the receiving unit 202 are integrated and disposed on the same layer of the display panel 10, and in other implementations of the present application, the transmitting unit 201 and the receiving unit 202 may also be disposed on different layers of the display panel 10.
For example, the receiving unit 202 may be disposed on the encapsulation layer 103, and the transmitting unit 201 may be disposed on the touch layer 104. In addition, when the projections of the transmitting unit 201 and the receiving unit 202 in the vertical direction overlap, the light returned by the object to be measured may be blocked by the transmitting unit 201, affecting the detection sensitivity.
In the embodiment of the present application, the projections of the emitting unit 201 and the receiving unit 202 on the light emitting layer 102 are separated, that is, the emitting unit 201 and the receiving unit 202 are not overlapped in the vertical direction, so that mutual interference between the emitting unit 201 and the receiving unit 202 can be avoided, and the detection sensitivity of the optical line sensor 20 is improved.
It should be noted that, when the transmitting unit 201 is disposed below the layer where the receiving unit 202 is located, a part of the infrared light emitted by the transmitting unit 201 is directly received by the receiving unit 202, which affects the sensitivity of detection, and therefore, the transmitting unit 201 is disposed above the layer where the receiving unit 202 is located, which can further improve the sensitivity of detection, and therefore, when the light sensor 20 is disposed, it is preferable to dispose the transmitting unit 201 above the layer where the receiving unit 202 is located.
In other implementations of the present disclosure, the transmitting unit 201 and the receiving unit 202 may be disposed on different layers of the encapsulation layer 103, the touch layer 104, the upper polarizer 105, the cover 106, and the like. It is only necessary to make the layer where the transmitting unit 201 is located higher than the layer where the receiving unit 202 is located, and these all belong to the protection scope of the present application.
The embodiment of the present application further provides an electronic device, where the electronic device includes any one of the display panels 10 described above, and the electronic device has the same technical effects as the display panel 10 provided in the foregoing embodiment, and details are not repeated here.
The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (14)

1. The display panel is characterized by comprising a display area, a light sensor and a plurality of sub-pixels, wherein the light sensor and the sub-pixels are arranged in the display area;
the display panel comprises a light sensation device layer and a display layer;
wherein the sub-pixels are disposed in the display layer;
the light sensor layer is independent of the display layer, and the light sensor is arranged in the light sensor layer;
the light sensor includes: the infrared light detection device comprises a transmitting unit and a receiving unit, wherein the transmitting unit is used for transmitting infrared light to the environment of the display panel, and the receiving unit is used for receiving the infrared light reflected by a measured object; the vertical projection of the emitting unit and the receiving unit on the display layer is positioned in the gap of the sub-pixel.
2. The display panel according to claim 1, characterized in that the display panel further comprises:
a substrate and an encapsulation layer;
the display layer is disposed between the substrate and the encapsulation layer, the display layer including: a light emitting layer including a plurality of sub-pixels that actively emit light.
3. The display panel according to claim 1, characterized in that the display panel further comprises:
a substrate and an encapsulation layer;
the display layer is disposed between the substrate and the encapsulation layer, the display layer including: the liquid crystal display device comprises a liquid crystal layer and a filter film arranged on the liquid crystal layer, wherein the filter film comprises a plurality of sub-pixels.
4. The display panel according to claim 2 or 3, wherein the transmitting unit and the receiving unit are disposed on the same layer and on the substrate or the encapsulation layer; or the transmitting unit and the receiving unit are arranged in different layers and are respectively arranged on the substrate or the packaging layer.
5. The display panel according to claim 2 or 3, wherein the display panel further comprises a touch layer; the touch layer is arranged on one side of the packaging layer far away from the substrate; the transmitting unit and the receiving unit are arranged on the touch layer.
6. The display panel according to claim 2 or 3, wherein the display panel further comprises an upper polarizer; the upper polaroid is arranged on one side, far away from the substrate, of the packaging layer; the transmitting unit and the receiving unit are arranged on the surface of one side, far away from the substrate, of the upper polaroid.
7. The display panel according to claim 2 or 3, characterized in that the display panel further comprises a cover plate; the cover plate is arranged on one side, far away from the substrate, of the packaging layer; the transmitting unit and the receiving unit are arranged on one side surface of the cover plate close to the substrate.
8. The display panel according to any one of claims 1 to 7, wherein the emission unit comprises: the infrared light emitting device comprises an emission control circuit and a light emitting element connected with the emission control circuit, wherein the emission control circuit is used for receiving an electric signal sent by a peripheral circuit and triggering the light emitting element according to the electric signal so that the light emitting element emits infrared light.
9. The display panel according to claim 8, wherein the display panel further comprises a first light blocking structure; the first light blocking structure is arranged on one side where the light emitting surface of the light emitting element is located and is arranged around the circumference of the light emitting element; wherein a ratio of the radius R1 of the light incident surface of the light emitting element to the height H1 of the first light blocking structure is R1/H1 ═ tan θ1，θ1The angle of the angle is 5-45 degrees.
10. The display panel according to any one of claims 1 to 9, wherein the receiving unit includes a light sensing control circuit and a light sensing unit connected to the light sensing control circuit; the photosensitive unit is used for receiving reflected light reflected by a measured object, performing photoelectric conversion and generating an electric signal; the photosensitive control circuit is used for reading the electric signal and outputting the electric signal.
11. The display panel according to claim 10, wherein the receiving unit further comprises a filter layer; the filter layer is arranged on the light incident surface of the light sensing unit; the filter layer is used for filtering light rays incident to the photosensitive unit;
the filter layer comprises a silicon oxide layer and a titanium oxide layer which are stacked.
12. The display panel according to claim 10 or 11, wherein the display panel further comprises a second light blocking structure; the second light blocking structure is arranged on one side where the light incident surface of the photosensitive unit is located and surrounds the photosensitive unit for a circle, wherein the ratio of the radius R2 of the light incident surface of the photosensitive unit to the height H2 of the second light blocking structure is R2/H2-tan theta2，θ2The angle of the angle is 5-45 degrees.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
14. An electronic device comprising a processor, and the display apparatus of claim 13, the processor being in signal connection with the transmitting unit and the receiving unit; the processor is used for calculating the distance between the display device and the measured object according to the infrared light emitted by the emitting unit and the reflected light received by the receiving unit, and adjusting the brightness of the display device according to the distance between the display device and the measured object.
CN202010560975.5A 2020-04-10 2020-06-18 Display panel, display device, and electronic apparatus Pending CN113820878A (en)

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CN202010560975.5A CN113820878A (en) 2020-06-18 2020-06-18 Display panel, display device, and electronic apparatus
PCT/CN2021/085450 WO2021204093A1 (en) 2020-04-10 2021-04-02 Display screen and electronic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010560975.5A CN113820878A (en) 2020-06-18 2020-06-18 Display panel, display device, and electronic apparatus

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CN113820878A true CN113820878A (en) 2021-12-21

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