WO2021022438A1 - 背光基板及其制造方法、和显示装置 - Google Patents

背光基板及其制造方法、和显示装置 Download PDF

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Publication number
WO2021022438A1
WO2021022438A1 PCT/CN2019/099238 CN2019099238W WO2021022438A1 WO 2021022438 A1 WO2021022438 A1 WO 2021022438A1 CN 2019099238 W CN2019099238 W CN 2019099238W WO 2021022438 A1 WO2021022438 A1 WO 2021022438A1
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Prior art keywords
light
emitting elements
base substrate
substrate
depth sensors
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Application number
PCT/CN2019/099238
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English (en)
French (fr)
Inventor
王鹏鹏
王海生
丁小梁
李扬冰
李亚鹏
张平
邓立凯
王玉波
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to PCT/CN2019/099238 priority Critical patent/WO2021022438A1/zh
Priority to CN201980001244.2A priority patent/CN110603482B/zh
Priority to US16/966,581 priority patent/US11796858B2/en
Publication of WO2021022438A1 publication Critical patent/WO2021022438A1/zh

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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
    • G—PHYSICS
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    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • G01S7/4813—Housing arrangements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G—PHYSICS
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    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
    • G01S17/894—3D imaging with simultaneous measurement of time-of-flight at a 2D array of receiver pixels, e.g. time-of-flight cameras or flash lidar
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
    • G01S7/4815—Constructional features, e.g. arrangements of optical elements of transmitters alone using multiple transmitters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/20—Image signal generators
    • H04N13/271—Image signal generators wherein the generated image signals comprise depth maps or disparity maps
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133624—Illuminating devices characterised by their spectral emissions
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/11—Function characteristic involving infrared radiation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen

Definitions

  • the present disclosure relates to the field of display technology, and in particular to a backlight substrate and a display device including the backlight substrate.
  • the current mainstream 3D depth sensors are mainly based on the following three technologies: structured light (Structured Light), TOF (Time Of Flight), and binocular imaging (Stereo System).
  • structured light Structured Light
  • TOF Time Of Flight
  • Binocular imaging Step System
  • the present disclosure provides a backlight substrate, including: a base substrate; a plurality of first light-emitting elements, the plurality of first light-emitting elements are located on the base substrate and configured to emit first light; A second light-emitting element, the plurality of second light-emitting elements are located on the base substrate and are configured to emit second light, the second light having a wavelength different from the first light; a plurality of depth sensors, The plurality of depth sensors are located on the base substrate and are configured to receive second light emitted from the plurality of second light emitting elements and reflected by the target, and determine the depth of the target based on the received second light Information; and a diffusion layer that is in direct contact with the light-emitting surfaces of the plurality of first light-emitting elements and is configured to diffuse the first light emitted from the plurality of first light-emitting elements.
  • the backlight substrate further includes a shielding structure and a filter and a lens sequentially located on the light receiving side of the depth sensor.
  • the depth sensor, the filter and the lens are located in the space defined by the shielding structure.
  • the distance between the surface of the diffusion layer on the side away from the base substrate and the base substrate is greater than the distance between the light-emitting surface of the first light-emitting element and the base substrate. The distance is smaller than the height of the shielding structure.
  • the diffusion layer includes an encapsulant doped with an organic light diffusion agent.
  • the plurality of first light-emitting elements, the plurality of second light-emitting elements, and the plurality of depth sensors are located on the same side of the base substrate, and the diffusion layer is located on the first A light-emitting element, the plurality of second light-emitting elements, and a side of the plurality of depth sensors away from the base substrate.
  • the backlight substrate further includes a PET layer located on a side of the diffusion layer away from the base substrate.
  • the plurality of second light emitting elements are configured to emit infrared modulated light as the second light
  • the plurality of first light emitting elements are configured to emit visible light as the first light
  • the plurality of The depth sensor includes an infrared-sensitive depth sensor.
  • the plurality of first light-emitting elements are arranged on the base substrate in an array form, and the plurality of second light-emitting elements are arranged at gaps between the plurality of first light-emitting elements.
  • the plurality of depth sensors are arranged along the edge of the base substrate.
  • the present disclosure also provides a display device including a display panel and the backlight substrate according to the present disclosure.
  • the display panel is located on the light-emitting surface of the backlight substrate and is configured to display images using the first light emitted by the plurality of first light-emitting elements of the backlight substrate.
  • the display panel is a liquid crystal display panel
  • the display device further includes a control circuit configured to control the liquid crystal display in the liquid crystal display panel based on the measured display uniformity of the liquid crystal display panel. The deflection makes the display brightness of the liquid crystal display panel uniform.
  • the display device further includes an adjustment circuit configured to adjust the brightness of the first light-emitting element while the liquid crystal display panel displays an image to adjust the number of display gray levels of the liquid crystal display panel.
  • the present disclosure also provides a method for manufacturing a backlight substrate, including: providing a base substrate; forming a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of depth sensors on the base substrate, Wherein, the plurality of first light-emitting elements are formed to emit first light; the plurality of second light-emitting elements are formed to emit second light, and the second light has a different wavelength from the first light; A plurality of depth sensors are formed to receive second light emitted from the plurality of second light-emitting elements and reflected by the target, and to determine depth information of the target based on the received second light; A diffusion layer in direct contact with the light-emitting surface of the light-emitting element, and the diffusion layer is configured to diffuse the first light emitted from the plurality of first light-emitting elements.
  • the method further includes: forming a shielding structure, a filter and a lens sequentially located on the light receiving side of the depth sensor.
  • the depth sensor, the filter and the lens are located in the space defined by the shielding structure.
  • the distance between the surface of the diffusion layer on the side away from the base substrate and the base substrate is greater than the distance between the light-emitting surface of the first light-emitting element and the base substrate. The distance is smaller than the height of the shielding structure.
  • the diffusion layer includes an encapsulant doped with an organic light diffusion agent.
  • the plurality of first light emitting elements, the plurality of second light emitting elements, and the plurality of depth sensors are formed on the same side of the base substrate, and the diffusion layer is formed on the same side of the base substrate. A side of the first light-emitting element, the plurality of second light-emitting elements, and the plurality of depth sensors away from the base substrate.
  • the method further includes forming a PET layer on a side of the diffusion layer away from the base substrate.
  • the plurality of second light-emitting elements are formed to emit infrared modulated light as the second light
  • the plurality of first light-emitting elements are formed to emit visible light as the first light
  • the plurality of The depth sensor includes an infrared-sensitive depth sensor.
  • the plurality of first light-emitting elements, the plurality of second light-emitting elements, and the plurality of depth sensors are formed on the base substrate using a micro-transfer technology.
  • FIG. 1 is a schematic diagram showing the structure of a backlight substrate according to some embodiments of the present disclosure.
  • FIG. 2 is a schematic diagram showing the structure of a backlight substrate according to some embodiments of the present disclosure.
  • FIG. 3 is a diagram illustrating the working principle of the TOF gesture recognizer according to some embodiments of the present disclosure.
  • FIG. 4 is a schematic diagram showing the structure of a backlight substrate according to some embodiments of the present disclosure.
  • FIG. 5 is a schematic diagram showing the structure of a display device according to some embodiments of the present disclosure.
  • FIG. 6 is a schematic diagram showing the structure of a display device according to some embodiments of the present disclosure.
  • FIG. 7 is a schematic diagram showing the layout of the depth sensor in some embodiments of the present disclosure.
  • FIG. 8 is a schematic layout diagram of a first light-emitting element and a second light-emitting element according to some embodiments of the present disclosure.
  • FIG. 9 is a schematic diagram of the connection between a liquid crystal display panel and a control circuit according to some embodiments of the present disclosure.
  • FIG. 10 is a schematic diagram of the connection between the adjusting circuit and the first light-emitting element according to some embodiments of the present disclosure.
  • a series of film materials for example, a diffuser, a quantum dot film, a prism film, etc.
  • a series of film materials are usually included to make the display light emitted by the light-emitting element of the backlight substrate more uniform.
  • the depth sensor can be arranged in the gap of the light-emitting element of the backlight substrate, these film materials will deteriorate the imaging quality of the depth sensor. Therefore, the present disclosure particularly provides a backlight substrate, a manufacturing method thereof, and a display device including the backlight substrate, which basically eliminates one or more of the problems caused by the limitations and shortcomings of the prior art.
  • the present disclosure provides a backlight substrate, including: a base substrate; a plurality of first light-emitting elements, the plurality of first light-emitting elements are located on the base substrate and configured to emit first light; and A second light-emitting element, the plurality of second light-emitting elements are located on the base substrate and configured to emit second light, the second light having a different wavelength from the first light; a plurality of depth sensors The plurality of depth sensors are located on the base substrate, and are configured to receive second light emitted from the plurality of second light-emitting elements and reflected by the target, and determine whether the target is based on the received second light Depth information; and a diffusion layer that is in direct contact with the light-emitting surfaces of the plurality of first light-emitting elements and is configured to diffuse the first light emitted from the plurality of first light-emitting elements.
  • FIG. 1 is a schematic diagram showing the structure of a backlight substrate in some embodiments according to the present disclosure.
  • the backlight substrate 10 includes a base substrate 11 and a plurality of first light-emitting elements 12, a plurality of second light-emitting elements 13 and a plurality of depth sensors 14 on the base substrate 11.
  • the plurality of first light emitting elements 12 are configured to emit first light.
  • the plurality of second light emitting elements 13 are configured to emit second light, the second light having a different wavelength from the first light.
  • the plurality of depth sensors 14 are configured to receive second light emitted from the plurality of second light emitting elements 13 and reflected by the target, and determine depth information of the target based on the received second light. As shown in FIG.
  • the backlight substrate 10 further includes a diffuser located on a side of the plurality of first light-emitting elements 12, the plurality of second light-emitting elements 13, and the plurality of depth sensors 14 away from the base substrate 11.
  • Glue layer 15 The diffusion glue layer 15 is configured to diffuse the first light emitted from the plurality of first light emitting elements 12.
  • the backlight substrate according to the embodiment of the present disclosure may be applied to a liquid crystal display device.
  • the liquid crystal display panel can be arranged on the light emitting side of the backlight substrate.
  • the first light emitted by the plurality of first light-emitting elements 2 in the backlight substrate 10 is used for the display panel to realize the display function.
  • the plurality of second light emitting elements 13 and the plurality of depth sensors 14 in the backlight substrate 10 may constitute a TOF gesture recognition device.
  • the second light emitted from the plurality of second light emitting elements 13 of the backlight substrate 10 passes through the display panel, is reflected by a target (for example, a user's hand), and then enters the plurality of depth sensors 14 through the display panel.
  • a target for example, a user's hand
  • a depth algorithm is used for calculation to obtain the depth information of the target, thereby realizing the spatial positioning of the target.
  • the display device having the backlight substrate according to the embodiment of the present disclosure can realize gesture recognition, and thus can realize the functions of display and human-computer interaction at the same time.
  • the film material used to homogenize the display light in the traditional backlight substrate is omitted, and only a diffusion glue layer is used to diffuse the display light (first light). Therefore, the imaging of the depth sensor in the backlight substrate according to the embodiment of the present disclosure is not affected by the film material, so that the detection accuracy is greatly improved.
  • the backlight substrate further includes a shielding structure 140 and a filter 141 and a lens 142 that are sequentially located on the light receiving side of the depth sensor 14.
  • the depth sensor 14, the filter 141 and the lens 142 are located in the space defined by the shielding structure 140.
  • the filter 141 is configured to filter out light other than the second light.
  • the shielding structure 140 includes a bottom located on the non-light receiving side of the depth sensor 14 and side walls surrounding the depth sensor 14, the filter 141 and the lens 142. In some embodiments, as shown in FIG.
  • the distance H1 between the surface of the diffusion glue layer 15 on the side away from the base substrate 11 and the base substrate 11 is greater than the light-emitting surface S of the first light-emitting element 12 relative to the substrate.
  • the height H2 of the substrate 11 is smaller than the height H3 of the shielding structure 140.
  • the height H3 of the shielding structure 140 is greater than the thickness H1 of the diffusion glue layer 15, so that the diffusion glue layer 15 will not block the lens 142, thereby having no effect on the imaging of the depth sensor.
  • the base substrate 11 is a printed circuit board (PCB) or a glass substrate.
  • the diffusion glue layer includes an LED encapsulation glue doped with an organic (epoxy resin) light diffusing agent.
  • the plurality of first light-emitting elements 12 are new light sources such as mini LEDs or micro LEDs.
  • a TOF gesture recognition device including the plurality of second light-emitting elements 13 and the plurality of depth sensors 14 may be provided in an existing backlight substrate including a novel light source such as a mini LED or a micro LED.
  • the plurality of first light-emitting elements 12 are arranged in an array on the base substrate 11, and the plurality of second light-emitting elements 13 and the plurality of depth sensors 14 are arranged on the plurality of second light-emitting elements.
  • the backlight substrate 10 further includes a PET (polyethylene terephthalate) layer 16 located on the side of the diffusion glue layer 15 away from the base substrate 11.
  • the PET layer 16 can further enhance the diffusion and homogenization of the first light for display.
  • the plurality of second light emitting elements 13 are configured to emit infrared modulated light as the second light
  • the plurality of first light emitting elements 12 are configured to emit visible light as the first light
  • the plurality of depth sensors 14 Including infrared sensitive depth sensor.
  • the plurality of depth sensors are silicon-based image sensors.
  • the working principle of the TOF gesture recognition device composed of the plurality of second light emitting elements 13 and the plurality of depth sensors 14 is shown in FIG. 3.
  • the second light emitting element 13 emits infrared modulated light.
  • the infrared modulated light is reflected by the target (for example, the user's hand) and then incident on the depth sensor 14.
  • the depth sensor demodulates the received light signal and calculates the target's value based on the depth algorithm. Distance value.
  • the principle of TOF depth calculation is essentially to calculate the round-trip time of light for distance measurement.
  • the multiple depth sensors implement 3D imaging through the same principle, and by combining the detection results of the multiple depth sensors, a complete depth map of the target can be obtained, thereby facilitating the realization of gesture recognition and spatial interaction.
  • an infrared light source as the second light-emitting element 13 not only does not affect the display function of the display panel, but also does not cause harm to the human body.
  • the base substrate 11 is a transparent substrate, for example, a glass substrate; the plurality of first light-emitting elements 12, the plurality of second light-emitting elements 13, and the plurality of depths
  • the sensor 14 is located on the same side of the base substrate 11, and the base substrate 11 is located on the light-exit side of the plurality of first light-emitting elements 12 and the plurality of second light-emitting elements 13; the backlight substrate 10 also includes a PET layer 16, which is located A side of the base substrate 11 away from the plurality of first light emitting elements 12, the plurality of second light emitting elements 13 and the plurality of depth sensors 14.
  • the arrangement of the plurality of first light-emitting elements 12, the plurality of second light-emitting elements 13, and the plurality of depth sensors 14 on the base substrate 11 is not limited. .
  • the plurality of depth sensors 14 may be arranged on a portion of the backlight substrate 10 corresponding to the display area of the display panel, or may be arranged on a portion of the backlight substrate 10 corresponding to the non-display area of the display panel (as shown in FIG. 7). In some embodiments, the plurality of depth sensors 14 are arranged along the edge of the base substrate 11.
  • the present disclosure also provides a display device that includes a display panel and a backlight substrate according to the present disclosure.
  • the display device includes a display panel 20 and a backlight substrate 10.
  • the display panel 20 is located on the light-emitting surface of the backlight substrate 10.
  • the backlight substrate 10 includes a base substrate 11 and a plurality of first light emitting elements 12, a plurality of second light emitting elements 13 and a plurality of depth sensors 14 on the base substrate 11.
  • the plurality of first light emitting elements 12 are configured to emit first light.
  • the display panel 20 is configured to display an image using the first light emitted by the plurality of first light emitting elements 12 of the backlight substrate 10.
  • the plurality of second light emitting elements 13 are configured to emit second light, the second light having a different wavelength from the first light.
  • the plurality of depth sensors 14 are configured to receive second light emitted from the plurality of second light emitting elements 13 and reflected by the target, and determine depth information of the target based on the received second light.
  • the plurality of first light-emitting elements 12, the plurality of second light-emitting elements 13 and the plurality of depth sensors 14 are located on the same side of the base substrate 11.
  • the backlight substrate 10 further includes an AND on a side of the plurality of first light-emitting elements 12, the plurality of second light-emitting elements 13, and the plurality of depth sensors 14 away from the base substrate 11.
  • the light-emitting surface S of the plurality of first light-emitting elements 12 directly contacts the diffusion glue layer 15.
  • the diffusion glue layer 15 is configured to diffuse the first light emitted from the plurality of first light emitting elements 12.
  • the backlight substrate 10 further includes a PET (polyethylene terephthalate) layer 16 which is located on the side of the diffusion glue layer 15 away from the base substrate 11.
  • the PET layer 16 can further enhance the diffusion and homogenization of the first light for display.
  • the method further includes forming a shielding structure 140 and a filter 141 and a lens 142 sequentially located on the light receiving side of the depth sensor 14.
  • the depth sensor 14, the filter 141 and the lens 142 are formed in the space defined by the shielding structure 140.
  • the distance H1 between the surface of the diffusion glue layer 15 away from the base substrate 11 and the base substrate is greater than the distance H2 between the light-emitting surface of the first light-emitting element 12 and the base substrate 11, and It is smaller than the height H3 of the shielding structure 140.
  • the display panel 20 is a liquid crystal display panel.
  • the plurality of second light emitting elements 13 and the plurality of depth sensors 14 in the backlight substrate 10 may constitute a TOF gesture recognition device.
  • the plurality of first light emitting elements 12 are configured to emit visible light as the first light, and the display panel 20 uses the visible light emitted by the plurality of first light emitting elements 12 to display images;
  • the light emitting element 13 is configured to emit infrared modulated light as the second light, and the plurality of depth sensors 14 include infrared sensitive depth sensors.
  • the plurality of depth sensors are silicon-based image sensors.
  • the infrared modulated light emitted from the plurality of light emitting elements 13 of the backlight substrate 10 passes through the display panel 20, is reflected by a target (for example, a user's hand), passes through the display panel 20 and enters the plurality of depth sensors 14.
  • a depth algorithm is used for calculation to obtain the depth information of the target, thereby realizing the spatial positioning of the target.
  • the display device according to the present disclosure can realize gesture recognition, and thus can realize the functions of display and human-computer interaction at the same time.
  • the display panel 20 may include a color filter substrate 21, an array substrate 22, and a liquid crystal layer 23 located between the color filter substrate 21 and the array substrate 22. It can be understood that in the present disclosure, there is no specific requirement for the infrared transmittance of the display panel. In some embodiments, the display panel 20 may have as high an infrared transmittance as possible. In the case that the infrared transmittance of the display panel is small, the luminous intensity of the infrared light source can be increased, thereby facilitating 3D detection.
  • the base substrate 11 is a transparent substrate, for example, a glass substrate; the plurality of first light-emitting elements 12, the plurality of second light-emitting elements 13, and the plurality of depths
  • the sensor 14 is located on the same side of the base substrate 11, and the base substrate 11 is located on the light-exit side of the plurality of first light-emitting elements 12 and the plurality of second light-emitting elements 13; the backlight substrate 10 also includes a PET layer 16, which is located A side of the base substrate 11 away from the plurality of first light emitting elements 12, the plurality of second light emitting elements 13 and the plurality of depth sensors 14.
  • the liquid crystal display panel may still cause uneven display brightness due to insufficient display light diffusion and homogenization.
  • the display brightness can be made uniform by further adjusting the deflection of the liquid crystal in the liquid crystal layer of the liquid crystal display panel.
  • the display device further includes a control circuit 30 configured to adjust the display uniformity by controlling the deflection of the liquid crystal in the liquid crystal display panel 20.
  • the display uniformity can be measured based on the principle of point spread function, and then the display uniformity can be adjusted by controlling the deflection of the liquid crystal by the weighted fitting method.
  • the display uniformity directly based on the software algorithm will cause the number of gray levels (brightness) of the display to be greatly reduced.
  • the number of gray levels (brightness) of the display For example, if the brightness of all pixels of the display panel is to be uniform, it may be necessary to perform uniformization based on the pixel with the lowest brightness, resulting in a decrease in the number of gray levels (brightness) of the display. In this case, it is necessary to increase the brightness of the display panel while ensuring the brightness uniformity.
  • the brightness of the first light-emitting element can be adjusted in synchronization with the image display to increase the number of gray levels displayed, or the conversion accuracy of the analog-to-digital converter (ADC) in the display device can be increased.
  • ADC analog-to-digital converter
  • the display device further includes an adjusting circuit 40, which is configured to adjust the brightness of the first light-emitting element 12 while the liquid crystal display panel displays images to increase the display gray scale of the liquid crystal display panel. number.
  • the present disclosure also provides a method for manufacturing a backlight substrate, including: providing a base substrate; forming a plurality of first light-emitting elements, a plurality of second light-emitting elements, and a plurality of depth sensors on the base substrate; and forming A diffusion glue layer directly in contact with the light-emitting surfaces of the plurality of first light-emitting elements.
  • the plurality of first light emitting elements are formed to emit first light.
  • the plurality of second light emitting elements are formed to emit second light, the second light having a different wavelength from the first light.
  • the plurality of depth sensors are formed to receive second light emitted from the plurality of second light emitting elements and reflected by the target, and determine depth information of the target based on the received second light.
  • the diffusion glue layer is configured to diffuse the first light emitted from the plurality of first light-emitting elements.
  • the plurality of first light-emitting elements, the plurality of second light-emitting elements, and the plurality of depth sensors are formed on the same side of the base substrate;
  • the diffusion glue layer directly in contact with the light emitting surface includes a diffusion glue layer formed on the side of the plurality of first light emitting elements, the plurality of second light emitting elements and the plurality of depth sensors away from the base substrate, and the diffusion glue layer It is formed to diffuse the first light emitted from the plurality of first light emitting elements.
  • the method further includes forming a PET layer on a side of the diffusion glue layer away from the base substrate.
  • the plurality of second light emitting elements are formed to emit infrared modulated light as the second light
  • the plurality of first light emitting elements are formed to emit visible light as the first light
  • the plurality of depth sensors include infrared Sensitive depth sensor.
  • the plurality of first light-emitting elements, the plurality of second light-emitting elements, and the plurality of depth sensors are formed on the same side of the base substrate; the base substrate is a transparent substrate; the method further It includes forming a PET layer on a side of the base substrate away from the plurality of first light emitting elements, the plurality of second light emitting elements, and the plurality of depth sensors.
  • the plurality of first light-emitting elements, the plurality of second light-emitting elements, and the plurality of depth sensors are formed on the base substrate using a micro-transfer technology.
  • the plurality of second light emitting elements and the plurality of depth sensors may be arranged at gaps between the plurality of first light emitting elements. Therefore, there is no need to add an additional transfer substrate for the plurality of second light emitting elements and the plurality of depth sensors.
  • the plurality of first light-emitting elements are one of mini LEDs and micro LEDs.
  • the step of forming the film material used to homogenize the display light in the traditional backlight substrate is omitted, and only the diffusion glue layer and/or PET layer is formed to effect diffusion. Show the role of light (first light). Therefore, the imaging of the depth sensor in the backlight substrate manufactured according to the manufacturing method of the embodiment of the present disclosure is not affected by the film material, so that the detection accuracy is greatly improved.

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Abstract

一种背光基板（10）及其制造方法、以及显示装置。背光基板（10），包括：衬底基板（11）；多个第一发光元件（12），位于衬底基板（11）上，并且构造为发射第一光；多个第二发光元件（13），位于衬底基板（11）上，并且构造为发射第二光，第二光具有与第一光不同的波长；多个深度传感器（14），位于衬底基板（11）上，并且构造为接收从多个第二发光元件（13）发射并被目标反射的第二光，以及基于接收的第二光确定目标的深度信息；以及扩散层（15），与多个第一发光元件（12）的出光面直接接触，并且构造为扩散从多个第一发光元件（12）发射的第一光。

Description

背光基板及其制造方法、和显示装置 技术领域
本公开涉及显示技术领域，具体涉及背光基板和包括该背光基板的显示装置。
背景技术
随着3D技术的发展，立体显示、机器视觉、卫星遥感等技术的应用越来越多地需要获取场景的深度信息。通常，需要依靠深度传感器来探测环境的深度信息。将深度传感器与显示面板集成目前已经成为显示领域的研究热点。
目前主流的3D深度传感器主要基于以下三种技术：结构光(Structured Light)、TOF(Time Of Flight)、双目成像(Stereo System)。基于TOF的深度计算不受物体表面灰度和特征影响，可以实时、快速且准确地进行三维探测。
发明内容
一方面，本公开提供一种背光基板，包括：衬底基板；多个第一发光元件，所述多个第一发光元件位于所述衬底基板上，并且构造为发射第一光；多个第二发光元件，所述多个第二发光元件位于所述衬底基板上，并且构造为发射第二光，所述第二光具有与所述第一光不同的波长；多个深度传感器，所述多个深度传感器位于所述衬底基板上，并且构造为接收从所述多个第二发光元件发射并被目标反射的第二光，以及基于接收的第二光确定所述目标的深度信息；以及扩散层，其与所述多个第一发光元件的出光面直接接触，并且构造为扩散从所述多个第一发光元件发射的第一光。
在一些实施例中，所述背光基板还包括：遮挡结构和依次位于所述深度传感器的光接收侧的滤光片和透镜。所述深度传感器、所述 滤光片和所述透镜位于所述遮挡结构限定的空间内。
在一些实施例中，所述扩散层的远离所述衬底基板一侧的表面与所述衬底基板之间的距离大于所述第一发光元件的出光面与所述衬底基板之间的距离，并且小于所述遮挡结构的高度。
在一些实施例中，所述扩散层包括掺有有机光扩散剂的封装胶。
在一些实施例中，所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器位于所述衬底基板的同一侧，所述扩散层位于所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器的远离所述衬底基板的一侧。
在一些实施例中，背光基板还包括PET层，所述PET层位于所述扩散层的远离所述衬底基板的一侧。
在一些实施例中，所述多个第二发光元件构造为发射红外调制光作为所述第二光，所述多个第一发光元件构造为发射可见光作为所述第一光，所述多个深度传感器包括红外敏感的深度传感器。
在一些实施例中，所述多个第一发光元件以阵列形式布置在所述衬底基板上，所述多个第二发光元件布置在所述多个第一发光元件之间的间隙处。
在一些实施例中，所述多个深度传感器沿着所述衬底基板的边缘排列。
另一方面，本公开还提供了一种显示装置，包括显示面板和根据本公开所述的背光基板。所述显示面板位于所述背光基板的出光面并且构造为利用所述背光基板的所述多个第一发光元件发射的第一光来显示图像。
在一些实施例中，所述显示面板为液晶显示面板，所述显示装置还包括控制电路，其构造为基于测量的所述液晶显示面板的显示均匀度来控制所述液晶显示面板中的液晶的偏转，使得所述液晶显示面板的显示亮度均匀。
在一些实施例中，所述显示装置还包括调节电路，其构造为在所述液晶显示面板显示图像的同时调节所述第一发光元件的亮度来调节所述液晶显示面板的显示灰阶数。
另一方面，本公开还提供一种制作背光基板的方法，包括：提供衬底基板；在所述衬底基板上形成多个第一发光元件、多个第二发光元件、多个深度传感器，其中，所述多个第一发光元件形成为发射第一光；所述多个第二发光元件形成为发射第二光，所述第二光具有与所述第一光不同的波长；所述多个深度传感器形成为接收从所述多个第二发光元件发射并被目标反射的第二光，以及基于接收的第二光确定所述目标的深度信息；以及形成与所述多个第一发光元件的出光面直接接触的扩散层，所述扩散层构造为扩散从所述多个第一发光元件发射的第一光。
在一些实施例中，所述方法还包括：形成遮挡结构和依次位于所述深度传感器的光接收侧的滤光片和透镜。所述深度传感器、所述滤光片和所述透镜位于所述遮挡结构限定的空间内。
在一些实施例中，所述扩散层的远离所述衬底基板一侧的表面与所述衬底基板之间的距离大于所述第一发光元件的出光面与所述衬底基板之间的距离，并且小于所述遮挡结构的高度。
在一些实施例中，所述扩散层包括掺有有机光扩散剂的封装胶。
在一些实施例中，所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器形成在所述衬底基板的同一侧，所述扩散层形成在所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器的远离所述衬底基板的一侧。
在一些实施例中，所述方法还包括在所述扩散层的远离所述衬底基板的一侧形成PET层。
在一些实施例中，所述多个第二发光元件形成为发射红外调制光作为所述第二光，所述多个第一发光元件形成为发射可见光作为所述第一光，所述多个深度传感器包括红外敏感的深度传感器。
在一些实施例中，采用微转印技术将所述多个第一发光元件、所述多个第二发光元件、所述多个深度传感器形成在所述衬底基板上。
附图说明
以下附图仅是用于根据各种公开的实施例的说明性目的的示例， 而不旨在限制本发明的范围。
图1是示出根据本公开的一些实施例的背光基板的结构的示意图。
图2是示出根据本公开的一些实施例的背光基板的结构的示意图。
图3是示出根据本公开的一些实施例的TOF手势识别器的工作原理的示图。
图4是示出根据本公开的一些实施例的背光基板的结构的示意图。
图5是示出根据本公开的一些实施例的显示装置的结构的示意图。
图6是示出根据本公开的一些实施例的显示装置的结构的示意图。
图7是示出本公开的一些实施例中的深度传感器的布局的示意图。
图8是根据本公开的一些实施例的第一发光元件和第二发光元件的示意性布局图。
图9是根据本公开的一些实施例的液晶显示面板与控制电路的连接示意图。
图10是根据本公开的一些实施例的调节电路与第一发光元件的连接示意图。
具体实施方式
以下结合附图对本公开的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本公开，并不用于限制本公开。
在传统的直下式背光基板中，通常包括一系列的膜材(例如，扩散片、量子点膜和棱镜膜等)以使得背光基板的发光元件发射的显示光更加均匀。虽然可以将深度传感器设置在背光基板的发光元件的间隙中，但是这些膜材会使深度传感器的成像质量变差。因此，本公 开特别提供了一种背光基板及其制造方法以及包括该背光基板的显示装置，其基本上消除了由于现有技术的局限和缺点导致的问题中的一个或多个。一方面，本公开提供了一种背光基板，包括：衬底基板；多个第一发光元件，所述多个第一发光元件位于所述衬底基板上，并且构造为发射第一光；多个第二发光元件，所述多个第二发光元件位于所述衬底基板上，并且构造为发射第二光，所述第二光具有与所述第一光不同的波长；多个深度传感器，所述多个深度传感器位于所述衬底基板上，并且构造为接收从所述多个第二发光元件发射并被目标反射的第二光，以及基于接收的第二光确定所述目标的深度信息；以及扩散层，其与所述多个第一发光元件的出光面直接接触，并且构造为扩散从所述多个第一发光元件发射的第一光。
图1是示出根据本公开的一些实施例中的背光基板的结构的示意图。参考图1，在一些实施例中，背光基板10包括衬底基板11以及位于衬底基板11上的多个第一发光元件12、多个第二发光元件13和多个深度传感器14。所述多个第一发光元件12构造为发射第一光。所述多个第二发光元件13构造为发射第二光，第二光具有与第一光不同的波长。所述多个深度传感器14构造为接收从所述多个第二发光元件13发射并被目标反射的第二光，以及基于接收的第二光确定所述目标的深度信息。如图1所示，所述多个第一发光元件12、所述多个第二发光元件13和所述多个深度传感器14位于衬底基板11的同一侧。在一些实施例中，背光基板10还包括位于所述多个第一发光元件12、所述多个第二发光元件13和所述多个深度传感器14的远离衬底基板11的一侧的扩散胶水层15。扩散胶水层15构造为扩散从所述多个第一发光元件12发射的第一光。
根据本公开实施例的背光基板可应用于液晶显示装置中。液晶显示面板可设置在背光基板的出光侧。背光基板10中的所述多个第一发光元件2发射的第一光供显示面板实现显示功能。背光基板10中的所述多个第二发光元件13和所述多个深度传感器14可以构成TOF手势识别器件。从背光基板10的所述多个第二发光元件13发射的第二光经过显示面板，被目标(例如，用户的手)反射后穿过显示 面板进入所述多个深度传感器14。在所述多个深度传感器中，利用深度算法进行计算，得到目标的深度信息，由此实现目标的空间定位。具有根据本公开的实施例的背光基板的显示装置可以实现手势识别，因而可以同时实现显示和人机交互的功能。
在根据本公开实施例的背光基板中，省去了传统背光基板中用于使显示光均匀化的膜材，而只是采用扩散胶水层来起到扩散显示光(第一光)的作用。因此，根据本公开实施例的背光基板中的深度传感器的成像不受膜材影响，从而检测精度大幅度提升。
在一些实施例中，背光基板还包括遮挡结构140以及依次位于深度传感器14的光接收侧的滤光片141和透镜142。如图1所示，深度传感器14、滤光片141和透镜142位于遮挡结构140限定的空间内。滤光片141构造为滤掉除第二光以外的光。遮挡结构140包括位于深度传感器14的非光接收侧的底部和包围深度传感器14、滤光片141和透镜142的侧壁。在一些实施例中，如图1所示，扩散胶水层15的远离衬底基板11一侧的表面与衬底基板11之间的距离H1大于第一发光元件12的出光面S相对于衬底基板11的高度H2，并且小于遮挡结构140的高度H3。遮挡结构140的高度H3大于扩散胶水层15的厚度H1，使得扩散胶水层15不会遮挡透镜142，从而对深度传感器的成像没有影响。
在一些实施例中，衬底基板11为印刷电路板(PCB)或玻璃基板。在一些实施例中，扩散胶水层包括掺有有机(环氧树脂)光扩散剂的LED封装胶。
在一些实施例中，所述多个第一发光元件12为诸如mini LED或micro LED的新型光源。可以在现有的包括诸如mini LED或micro LED的新型光源的背光基板中设置包括所述多个第二发光元件13和所述多个深度传感器14的TOF手势识别器件。在一些实施例中，所述多个第一发光元件12以阵列形式布置在衬底基板11上，所述多个第二发光元件13和所述多个深度传感器14布置在所述多个第一发光元件12之间的间隙处。如图8所示，多个第一发光元件12以阵列形式布置，多个第二发光元件13布置在多个第二发光元件12之间的间 隙处。
在一些实施例中，如图2所示，背光基板10还包括PET(polyethylene terephthalate)层16，该PET层位于所述扩散胶水层15的远离衬底基板11的一侧。通过PET层16，可以进一步增强显示用的第一光的扩散和匀化。
在一些实施例中，所述多个第二发光元件13构造为发射红外调制光作为第二光，所述多个第一发光元件12构造为发射可见光作为第一光，所述多个深度传感器14包括红外敏感的深度传感器。例如，所述多个深度传感器为硅基图像传感器。在该实施例中，由所述多个第二发光元件13和所述多个深度传感器14构成的TOF手势识别器件的工作原理如图3所示。第二发光元件13发射红外调制光，该红外调制光被目标(例如，用户的手)反射后入射至深度传感器14，深度传感器对接收的光信号进行解调，并基于深度算法计算出目标的距离值。TOF深度计算的原理本质上是计算光的往返时间进行距离测量。所述多个深度传感器通过相同的原理实现3D成像，通过结合所述多个深度传感器的检测结果，可以得到目标的完整深度图，从而便于实现手势识别和空间交互。
此外，采用红外光源作为第二发光元件13，不仅不影响显示面板的显示功能，而且对人体不造成伤害。
在一些实施例中，如图4所示，衬底基板11为透明基板，例如，玻璃基板；所述多个第一发光元件12、所述多个第二发光元件13和所述多个深度传感器14位于衬底基板11的同一侧，衬底基板11位于所述多个第一发光元件12和所述多个第二发光元件13的出光侧；背光基板10还包括PET层16，其位于衬底基板11的远离所述多个第一发光元件12、所述多个第二发光元件13和所述多个深度传感器14的一侧。通过将透明的衬底基板设置在所述多个第一发光元件12的发光侧，增加了从第一发光元件12发射的第一光的光程，有利于第一光的扩散。
需要注意的是，在本公开中，对所述多个第一发光元件12、所述多个第二发光元件13和所述多个深度传感器14在衬底基板11上 的排列方式不做限定。所述多个深度传感器14可以设置在背光基板10的与显示面板的显示区对应的部分，或者可以设置在背光基板10的与显示面板的非显示区对应的部分(如图7所示)。在一些实施例中，所述多个深度传感器14沿着衬底基板11的边缘排列。
另一方面，本公开还提供一种显示装置，该显示装置包括显示面板和根据本公开的背光基板。如图5所示，显示装置包括显示面板20和背光基板10。显示面板20位于背光基板10的出光面。
参考图5，在一些实施例中，背光基板10包括衬底基板11以及位于衬底基板11上多个第一发光元件12、多个第二发光元件13和多个深度传感器14。所述多个第一发光元件12构造为发射第一光。显示面板20构造为利用背光基板10的所述多个第一发光元件12发射的第一光来显示图像。所述多个第二发光元件13构造为发射第二光，第二光具有与第一光不同的波长。所述多个深度传感器14构造为接收从所述多个第二发光元件13发射并被目标反射的第二光，以及基于接收的第二光确定所述目标的深度信息。在一些实施例中，所述多个第一发光元件12、所述多个第二发光元件13和所述多个深度传感器14位于衬底基板11的同一侧。在一些实施例中，背光基板10还包括位于所述多个第一发光元件12、所述多个第二发光元件13和所述多个深度传感器14的远离衬底基板11的一侧的与所述多个第一发光元件12的出光面S直接接触的扩散胶水层15。扩散胶水层15构造为扩散从所述多个第一发光元件12发射的第一光。在一些实施例中，背光基板10还包括PET(polyethylene terephthalate)层16，该PET层位于所述扩散胶水层15的远离衬底基板11的一侧。通过PET层16，可以进一步增强显示用的第一光的扩散和匀化。
在一些实施例中，所述方法还包括形成遮挡结构140和依次位于深度传感器14的光接收侧的滤光片141和透镜142。深度传感器14、滤光片141和透镜142形成在遮挡结构140限定的空间内。在一些实施例中，扩散胶水层15的远离衬底基板11一侧的表面与衬底基板之间的距离H1大于第一发光元件12的出光面与衬底基板11之间 的距离H2，并且小于遮挡结构140的高度H3。
在一些实施例中，显示面板20为液晶显示面板。背光基板10中的所述多个第二发光元件13和所述多个深度传感器14可以构成TOF手势识别器件。在一些实施例中，所述多个第一发光元件12构造为发射可见光作为第一光，显示面板20利用所述多个第一发光元件12发射的可见光来显示图像；所述多个第二发光元件13构造为发射红外调制光作为第二光，所述多个深度传感器14包括红外敏感的深度传感器。例如，所述多个深度传感器为硅基图像传感器。
例如，从背光基板10的所述多个发光元件13发射的红外调制光经过显示面板20，被目标(例如，用户的手)反射后穿过显示面板20进入所述多个深度传感器14。在所述多个深度传感器中，利用深度算法进行计算，得到目标的深度信息，由此实现目标的空间定位。根据本公开的显示装置可以实现手势识别，因而可以同时实现显示和人机交互的功能。
如图5所示，显示面板20可以包括彩膜基板21、阵列基板22以及位于彩膜基板21和阵列基板22之间的液晶层23。可以理解的是，在本公开中，对显示面板的红外透过率没有特定要求。在一些实施例中，显示面板20可以具有尽量高的红外透过率。在显示面板的红外透过率较小的情况下，可以增加红外光源的发光强度，从而便于实现3D检测。
在一些实施例中，如图6所示，衬底基板11为透明基板，例如，玻璃基板；所述多个第一发光元件12、所述多个第二发光元件13和所述多个深度传感器14位于衬底基板11的同一侧，衬底基板11位于所述多个第一发光元件12和所述多个第二发光元件13的出光侧；背光基板10还包括PET层16，其位于衬底基板11的远离所述多个第一发光元件12、所述多个第二发光元件13和所述多个深度传感器14的一侧。通过将透明衬底基板设置在所述多个第一发光元件12的发光侧，增加了从第一发光元件12发射的第一光的光程，有利于第一光的扩散。
对于背光基板10的其他详情，参见本公开的上述实施例，此处 不再赘述。
在设置扩散胶水层和PET层的情况下，液晶显示面板仍然可能会由于显示光扩散和匀化不充分而导致显示亮度不均。在该情况下，可以进一步通过调节液晶显示面板的液晶层中液晶的偏转来使得显示亮度均匀。在一些实施例中，如图9所示，显示装置还包括控制电路30，其构造为通过控制液晶显示面板20中的液晶的偏转来调节显示均匀度。例如，可以基于点扩散函数原理，对显示均匀度进行测量，然后通过加权拟合法控制液晶偏转来调节显示均匀度。
在光源(例如，第一发光元件)中心和边缘的亮度差较大的情况下，直接基于软件算法调节显示均匀度会导致显示的灰阶数(亮度)大幅降低。例如，若要实现显示面板的所有像素的亮度均匀，则可能需以亮度最低的像素为基准来进行均匀化，从而导致显示的灰阶数(亮度)降低。在该情况下，需要在保证亮度均匀度的情况下提升显示面板的亮度。例如，可以通过与图像显示同步地调节第一发光元件(例如，mini LED或micro LED)的亮度来增加显示的灰阶数，或者可以通过增加显示装置中模数转换器(ADC)的转换精度来扩充显示的灰阶数。在一些实施例中，如图10所示，显示装置还包括调节电路40，其构造为在液晶显示面板显示图像的同时调节所述第一发光元件12的亮度来增加液晶显示面板的显示灰阶数。
另一方面，本公开还提供一种制作背光基板的方法，包括：提供衬底基板；在衬底基板上形成多个第一发光元件、多个第二发光元件、多个深度传感器；以及形成与所述多个第一发光元件的出光面直接接触的扩散胶水层。所述多个第一发光元件形成为发射第一光。所述多个第二发光元件形成为发射第二光，所述第二光具有与所述第一光不同的波长。所述多个深度传感器形成为接收从所述多个第二发光元件发射并被目标反射的第二光，以及基于接收的第二光确定目标的深度信息。扩散胶水层构造为扩散从所述多个第一发光元件发射的第一光。
在一些实施例中，所述多个第一发光元件、所述多个第二发光 元件和所述多个深度传感器形成在衬底基板的同一侧；形成与所述多个第一发光元件的出光面直接接触的扩散胶水层包括在所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器的远离衬底基板的一侧形成扩散胶水层，扩散胶水层形成为扩散从所述多个第一发光元件发射的第一光。
在一些实施例中，所述方法还包括在扩散胶水层的远离所述衬底基板的一侧形成PET层。
在一些实施例中，所述多个第二发光元件形成为发射红外调制光作为第二光，所述多个第一发光元件形成为发射可见光作为第一光，所述多个深度传感器包括红外敏感的深度传感器。
在一些实施例中，所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器形成在衬底基板的同一侧；衬底基板为透明基板；所述方法还包括在衬底基板的远离所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器的一侧形成PET层。
在一些实施例中，采用微转印技术将所述多个第一发光元件、所述多个第二发光元件、所述多个深度传感器形成在所述衬底基板上。所述多个第二发光元件和所述多个深度传感器可以布置在所述多个第一发光元件之间的间隙处。因此，无需增加额外的转印基板用于所述多个第二发光元件和所述多个深度传感器。
例如，所述多个第一发光元件是mini LED和micro LED中的一种。
在根据本公开实施例的背光基板的制造方法中，省去了形成传统背光基板中用于使显示光均匀化的膜材的步骤，而只是形成扩散胶水层和/或PET层来起到扩散显示光(第一光)的作用。因此，根据本公开实施例的制造方法制造的背光基板中的深度传感器的成像不受膜材影响，从而检测精度大幅度提升。
可以理解的是，以上实施方式仅仅是为了说明本公开的原理而采用的示例性实施方式，然而本公开并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开的精神和实质的情况下，可以做 出各种变型和改进，这些变型和改进也视为本公开的保护范围。

Claims (20)

  1. 一种背光基板，包括：
    衬底基板；
    多个第一发光元件，所述多个第一发光元件位于所述衬底基板上，并且构造为发射第一光；
    多个第二发光元件，所述多个第二发光元件位于所述衬底基板上，并且构造为发射第二光，所述第二光具有与所述第一光不同的波长；
    多个深度传感器，所述多个深度传感器位于所述衬底基板上，并且构造为接收从所述多个第二发光元件发射并被目标反射的第二光，以及基于接收的第二光确定所述目标的深度信息；以及
    扩散层，其与所述多个第一发光元件的出光面直接接触，并且构造为扩散从所述多个第一发光元件发射的第一光。
  2. 根据权利要求1所述的背光基板，还包括：遮挡结构和依次位于所述深度传感器的光接收侧的滤光片和透镜，
    其中，所述深度传感器、所述滤光片和所述透镜位于所述遮挡结构限定的空间内。
  3. 根据权利要求2所述的背光基板，其中，所述扩散层的远离所述衬底基板一侧的表面与所述衬底基板之间的距离大于所述第一发光元件的出光面与所述衬底基板之间的距离，并且小于所述遮挡结构的高度。
  4. 根据权利要求3所述的背光基板，其中，所述扩散层包括掺有有机光扩散剂的封装胶。
  5. 根据权利要求3所述的背光基板，其中，所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器位于所述衬底基 板的同一侧，
    所述扩散层位于所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器的远离所述衬底基板的一侧。
  6. 根据权利要求5所述的背光基板，还包括PET层，所述PET层位于所述扩散层的远离所述衬底基板的一侧。
  7. 根据权利要求1所述的背光基板，其中，所述多个第二发光元件构造为发射红外调制光作为所述第二光，所述多个第一发光元件构造为发射可见光作为所述第一光，所述多个深度传感器包括红外敏感的深度传感器。
  8. 根据权利要求1所述的背光基板，其中，所述多个第一发光元件以阵列形式布置在所述衬底基板上，所述多个第二发光元件布置在所述多个第一发光元件之间的间隙处。
  9. 根据权利要求1所述的背光基板，其中，所述多个深度传感器沿着所述衬底基板的边缘排列。
  10. 一种显示装置，包括显示面板和根据权利要求1至9中任一项所述的背光基板，其中，所述显示面板位于所述背光基板的出光面并且构造为利用所述背光基板的所述多个第一发光元件发射的第一光来显示图像。
  11. 根据权利要求10所述的显示装置，其中，所述显示面板为液晶显示面板，
    所述显示装置还包括控制电路，其构造为基于测量的所述液晶显示面板的显示均匀度来控制所述液晶显示面板中的液晶的偏转，使得所述液晶显示面板的显示亮度均匀。
  12. 根据权利要求11所述的显示装置，还包括调节电路，其构造为在所述液晶显示面板显示图像的同时调节所述第一发光元件的亮度来调节所述液晶显示面板的显示灰阶数。
  13. 一种制作背光基板的方法，包括：
    提供衬底基板；
    在所述衬底基板上形成多个第一发光元件、多个第二发光元件、多个深度传感器，其中，所述多个第一发光元件形成为发射第一光；所述多个第二发光元件形成为发射第二光，所述第二光具有与所述第一光不同的波长；所述多个深度传感器形成为接收从所述多个第二发光元件发射并被目标反射的第二光，以及基于接收的第二光确定所述目标的深度信息；以及
    形成与所述多个第一发光元件的出光面直接接触的扩散层，所述扩散层构造为扩散从所述多个第一发光元件发射的第一光。
  14. 根据权利要求13所述的方法，还包括：形成遮挡结构和依次位于所述深度传感器的光接收侧的滤光片和透镜，
    其中，所述深度传感器、所述滤光片和所述透镜形成在所述遮挡结构限定的空间内。
  15. 根据权利要求14所述的方法，其中，所述扩散层的远离所述衬底基板一侧的表面与所述衬底基板之间的距离大于所述第一发光元件的出光面与所述衬底基板之间的距离，并且小于所述遮挡结构的高度。
  16. 根据权利要求14所述的方法，其中，所述扩散层包括掺有有机光扩散剂的封装胶。
  17. 根据权利要求15所述的方法，其中，所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器形成在所述衬底基 板的同一侧，
    所述扩散层形成在所述多个第一发光元件、所述多个第二发光元件和所述多个深度传感器的远离所述衬底基板的一侧。
  18. 根据权利要求15所述的方法，还包括在所述扩散层的远离所述衬底基板的一侧形成PET层。
  19. 根据权利要求15所述的方法，其中，所述多个第二发光元件形成为发射红外调制光作为所述第二光，所述多个第一发光元件形成为发射可见光作为所述第一光，所述多个深度传感器包括红外敏感的深度传感器。
  20. 根据权利要求13所述的方法，其中，采用微转印技术将所述多个第一发光元件、所述多个第二发光元件、所述多个深度传感器形成在所述衬底基板上。
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