US20220115443A1 - Display device and image sensing method thereof - Google Patents

Display device and image sensing method thereof Download PDF

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Publication number
US20220115443A1
US20220115443A1 US17/464,742 US202117464742A US2022115443A1 US 20220115443 A1 US20220115443 A1 US 20220115443A1 US 202117464742 A US202117464742 A US 202117464742A US 2022115443 A1 US2022115443 A1 US 2022115443A1
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unit pixels
light
emitting
display device
sensing
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Jun-Wen Chung
Hsu-Wen Fu
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Guangzhou Tyrafos Semiconductor Technologies Co Ltd
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Guangzhou Tyrafos Semiconductor Technologies Co Ltd
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    • H01L27/288—
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
    • G06K9/0004—
    • G06K9/209—
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/10—Image acquisition
    • G06V10/12—Details of acquisition arrangements; Constructional details thereof
    • G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
    • G06V10/147—Details of sensors, e.g. sensor lenses
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/70—SSIS architectures; Circuits associated therewith
    • H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
    • H04N25/75—Circuitry for providing, modifying or processing image signals from the pixel array
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
    • H04N25/70—SSIS architectures; Circuits associated therewith
    • H04N25/76—Addressed sensors, e.g. MOS or CMOS sensors
    • H04N25/78—Readout circuits for addressed sensors, e.g. output amplifiers or A/D converters
    • H04N5/378—
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
    • H10K59/65—OLEDs integrated with inorganic image sensors
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K65/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element and at least one organic radiation-sensitive element, e.g. organic opto-couplers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • H01L27/3211—
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels

Definitions

  • the present invention relates generally to a display device, and more particularly to a display device and an image sensing method applicable to fingerprint image recognition.
  • OLED Organic Light-Emitting Diode
  • CMOS complementary metal oxide semiconductor
  • the above technical features are similar to one-piece on glass solution (OGS) or one-piece touch on lens (TOL) of a capacitive touch panel, which can also become a miniature sensor chip and used an imaging lens set to make a lens-based sensor module to be assembled under the display screen; (2) using a thin film transistor process, and using the sensitivity to visible light of amorphous silicon (a-Si:H) and polysilicon (poly-Si) to produce light sensitive elements on a glass substrate or a flexible substrate (such as polyimide film), and mounted under the OLED screen, which can also be used as a sealing glass to seal with the OLED panel to sense fingerprint information.
  • OGS one-piece on glass solution
  • TOL touch on lens
  • the above technical features are similar to capacitive touch panels, also known as on-cells by those with ordinary knowledge in the art; (3) inserting image sensors between the pixels of OLEDs, an organic photodiode (OPD) being disposed on the thin-film transistor (TFT) substrate, in addition to each set of pixels (R/GB), as a sensing element.
  • OLED organic photodiode
  • TFT thin-film transistor
  • the problem of using the aforementioned solution (1) is that as users pursue the image quality of display devices, and the design and process technology of OLED display devices mature, the unit pixels on OLED panels are increasing, making the gap between the sub-pixels of the OLED gradually decreasing, and more difficult for the under-screen fingerprint recognition technology to allow the light penetrate through the gaps between the sub-pixels of the OLED, which makes the implementation of the aforementioned solution (1) less feasible.
  • the problem of using the aforementioned solution (2) is the same as those of the aforementioned solution (1), which makes the implementation of the aforementioned solution (2) more difficult.
  • the problem of using the aforementioned solution (3) is that the technical solution of shrinking the image sensor and inserting it between the pixels of the OLED causes the number of the unit pixels on the OLED panel to decrease, thereby reducing the resolution of the OLED panel.
  • a primary objective of the present invention is to provide a display device having a plurality of unit pixels, the unit pixels emit light alternately, and when a part of the unit pixels emit light, the unit pixels are defined as in a light-emitting state, and the other part of the unit pixels not emitting light are defined as in a sensing state.
  • the present invention provides a high-performance image recognition without affecting the panel pixels.
  • the present invention provides a display device, applicable to an environment for sensing fingerprint images.
  • the display device comprises: a substrate, having an upper surface and a lower surface; a plurality of unit pixels, arranged on the substrate, the unit pixels comprising a plurality of red unit pixels, a plurality of green unit pixels, and a plurality of blue unit pixels, wherein the red unit pixels emitting a red incident light, the green unit pixels emitting a green incident light, and the blue unit pixels emitting a blue incident light; wherein, the unit pixels on the display device emitting light alternately; and when a part of the unit pixels emitting light, defined as in a light-emitting state, when the other part of the unit pixels not emitting light, defined as in a sensing state, the unit pixels in the light-emitting state being regarded as a light-emitting area, and the unit pixels in the sensing state being regarded as a sensing area, a part of the unit pixels in the light-emitting area emitting
  • the display device is one of an organic light-emitting diode display device and a micro light-emitting diode display device, but the present invention is not limited hereto.
  • the light-emitting area only includes the blue unit pixels among the unit pixels, but the present invention is not limited hereto.
  • the sensing area only includes the red unit pixels among the unit pixels, but the present invention is not limited hereto.
  • the sensing area includes one or a combination of the red unit pixels and the green unit pixels among the unit pixels, but the present invention is not limited hereto.
  • the unit pixels are disposed between the upper surface of the substrate and the cover panel, but the present invention is not limited hereto.
  • the unit pixels are disposed on the lower surface of the substrate, but the present invention is not limited hereto.
  • the thickness of the cover panel is 700 microns, but the present invention is not limited hereto.
  • the display device further comprises a readout circuit coupled to each of the unit pixels, and the readout circuit receives the image electrical signal and generates a corresponding image information.
  • the present invention based on the aforementioned display device, further provides an image sensing method, comprising: alternately illuminating a plurality of unit pixels on a display device, wherein, when a part of the unit pixels emitting light, defined as in a light-emitting state, when the other part of the unit pixels not emitting light, defined as in a sensing state, the unit pixels in the light-emitting state being regarded as a light-emitting area, and the unit pixels in the sensing state being regarded as a sensing area, a part of the unit pixels in the light-emitting area emitting an incident light to a test object, the test object reflecting the incident light to generate a reflected light, and a part of the unit pixels in the sensing area receiving the reflected light to generate an image electrical signal.
  • the display device is one of an organic light-emitting diode display device and a micro light-emitting diode display device, but the present invention is not limited hereto.
  • the display device and the image sensing method provided by the present invention mainly rely on the unit pixels to emit light alternately, wherein when a part of the unit pixels emit light, defined as in a light-emitting state; when the other part is not emitting light, defined as in a sensing state; by using the unit pixels in the light-emitting state as the light-emitter for under-screen fingerprint recognition, and the unit pixels in the sensing state as the sensor for under-screen fingerprint recognition, the present invention provides a high-performance image recognition solution without affecting the panel pixels.
  • FIG. 1 is a schematic view of a display device according to the present invention.
  • FIG. 2 is a schematic view of exemplary details of a display device according to the present invention.
  • FIG. 3 illustrates the absorption spectrum and emission spectrum of an exemplary host material of the display device according to the present invention
  • FIG. 4 is a schematic view illustrating that the light-emitting area according to the present invention is reflected to the sensing area after emitting light to the test object;
  • FIG. 5 is a flowchart illustrating the steps of the image sensing method of the present invention.
  • FIG. 6A is a timing diagram illustrating the implementation of the image sensing method of the present invention.
  • FIG. 6B is another timing diagram illustrating the implementation of the image sensing method of the present invention.
  • FIG. 7 is a schematic view of a display device according to the first embodiment of the present invention.
  • FIG. 8 is a flowchart illustrating the steps of performing the image sensing method according to the first embodiment of the present invention
  • FIG. 9A is a timing diagram illustrating the implementation of the image sensing method of the present invention.
  • FIG. 9B is another timing diagram illustrating the implementation of the image sensing method of the present invention.
  • FIG. 10 is a schematic diagram of a display device according to a second embodiment of the invention.
  • FIG. 1 is a schematic view of a display device according to the present invention.
  • the display device 100 according to the present invention includes: a substrate 11 , a plurality of unit pixel 12 , and a cover panel 13 .
  • the substrate 11 has an upper surface 111 and a lower surface 112 .
  • the cover panel 13 is disposed on the upper surface 111 of the substrate 11 .
  • the unit pixels 12 are disposed on the substrate 11 .
  • the substrate 11 may be, but is not limited to, a glass substrate, a polyethylene terephthalate (PET) substrate, a cycloolefin polymer (COP) substrate, a transparent polyimide (CPI) substrate, a polyethylene naphthalate (PET) substrate, a Diester (PEN) substrate, a polycarbonate (PC) substrate, a polyether sulfide (PES) substrate, or a polarizing film.
  • PET polyethylene terephthalate
  • COP cycloolefin polymer
  • CPI transparent polyimide
  • PET polyethylene naphthalate
  • PEN Diester
  • PC polycarbonate
  • PES polyether sulfide
  • the unit pixels 12 are disposed on the substrate 11 .
  • the unit pixels 12 include a red unit pixel 121 , a green unit pixel 122 , and a blue unit pixel 123 , wherein the red unit pixel 121 emits a red incident light R, the green unit pixel 122 emits a green incident light G, and the blue unit pixel 123 emits a blue incident light B.
  • the wavelength of the red incident light R according to the present invention may be between 620 nm and 750 nm, but the present invention is not limited hereto.
  • the wavelength of the green incident light G according to the present invention may be between 495 nm and 570 nm, but the present invention is not limited hereto.
  • the wavelength of the blue incident light B according to the present invention may be between 430 nm and 495 nm, but the present invention is not limited hereto.
  • the display device 100 may be an organic light emitting diode display (OLED display).
  • the unit pixel 12 includes an anode 21 , a hole transport layer 22 , a light-emitting layer 23 , an electron transport layer 24 , and a cathode 25 .
  • a pixel circuit 14 is provided on the substrate 11 , and is coupled to each of the unit pixels 12 to control each of the unit pixels 12 .
  • a planarization dielectric layer 15 is provided between the unit pixel 12 and the pixel circuit 14 . As shown in FIG.
  • the planarization dielectric layer 15 is provided with barrier wells 16 (bank) fabricated in advance by a yellow light etching process, and the anode 21 of the unit pixel 12 is connected to the corresponding pixel circuit 14 by passing through the via holes between the barrier wells 16 .
  • the display device 100 further includes an encapsulation layer 17 disposed between the unit pixel 12 and the cover panel 13 .
  • the encapsulation layer 17 may be a single-layer of inorganic encapsulation materials, a multilayer stack of inorganic encapsulation materials, or a stack of pairs of inorganic packaging materials and organic packaging materials.
  • the inorganic packaging material used can be, for example, but not limited to, silicon nitride (SiNx), silicon oxide (SiOx), silicon oxynitride (SiONx), aluminum oxide (AlOx), or titanium oxide (TiOx).
  • a light-shielding layer 14 may be provided on the substrate 11 and the cover panel 13 .
  • the light-shielding layer 14 is used to isolate the background light in the environment from sensing images of the display device 100 .
  • the term “isolation” covers both electrical isolation and physical isolation.
  • the display device 100 according to the present invention is an organic light-emitting diode display device, but currently the conventional organic light-emitting diode display devices generally use fluorescent materials or phosphorescent materials as the host material for light-emitting layer.
  • the main characteristic of the organic material is that when the molecules inside the material absorb radiant energy higher than its own energy, the electrons are excited from the ground state to an excited state with higher energy, and then the electrons in the excited state decays to the ground state to generate light. It can be understood that the display device 100 according to the present invention can also generate a corresponding image electrical signal by absorbing radiant energy higher than its own energy.
  • the unit pixels 12 are disposed on the substrate 11 .
  • the substrate 11 has an upper surface 111 and a lower surface 112 , and the unit pixels 12 are disposed between the upper surface 111 of the substrate 11 and the cover panel 13 .
  • the unit pixels 12 may be disposed on the lower surface 112 of the substrate 11 .
  • FIG. 4 is a schematic view illustrating that light emitted from the light-emitting area is reflected to the sensing area after irradiating onto the test object to be measured.
  • the unit pixels 12 on the display device 100 emit light alternately. When a part of the unit pixels 12 emit light, the unit pixels are said to be in a light-emitting state (not shown). At the same time, when another part of the unit pixels 12 do not emit light, the unit pixels are said to be in a sensing state. As shown in FIG.
  • the blue unit pixels 123 in the light-emitting state are used as the light-emitting area 31
  • the red unit pixels 121 in the sensing state are used as the sensing area 32 .
  • a part of the blue unit pixels 123 of the light-emitting area 31 emit an incident light R 1 to the test object 200
  • the incident light R 1 emitted to the test object 200 is reflected to generate a reflected light R 2 .
  • a part of the red light unit 121 in the sensing area 32 receives the reflected light R 2 and generates a corresponding image electrical signal.
  • the reason for using blue unit pixel 123 as the light-emitting area 31 is to ensure that the molecules inside the organic material of the sensing area 32 absorb radiant energy higher than their own energy to generate the corresponding image electrical signal, but the invention is not limited hereto.
  • FIG. 5 is a flowchart illustrating the steps of performing the image sensing method of the present invention.
  • the present invention further provides an image sensing method, applicable to the aforementioned display device 100 , and the image sensing method includes the following steps:
  • Definition step S 1 the unit pixels 12 on the display device 100 emit light alternately. When a part of the unit pixels 12 emit light, these unit pixels are defined as in a light-emitting state, and when another part of the unit pixels 12 do not emit light, these unit pixels are defined as in a sensing state; and proceed to light-emitting area step S 2 .
  • Light-emitting area step S 2 the unit pixels 12 in the light-emitting state are used as a light-emitting area 31 ; and proceed to sensing area step S 3 .
  • Sensing area step S 3 the unit pixels 12 in the sensing state are used as a sensing area 32 ; and proceed to emission step S 4 .
  • Emission step S 4 a part of the unit pixels 12 in the light-emitting area 31 emit an incident light R 1 to the test object 200 , and the incident light R 1 emitted to the test object 200 is reflected to generate a reflected light R 2 , and proceed to sensing step S 5 .
  • Sensing step S 5 a part of the unit pixels 12 in the sensing area 32 sense the reflected light R 2 , and the sensing area 32 generates a corresponding image electrical signal.
  • the image sensing method provided by the present invention can repeatedly execute the aforementioned emission step S 4 and sensing step S 5 , and the method and principle are the same as those described above, and will not be repeated here.
  • the sensing method of the present invention can also perform the emission step S 4 and the sensing step S 5 only once, but the present invention is not limited hereto.
  • FIG. 6A is a timing diagram illustrating the implementation of the image sensing method of the present invention
  • FIG. 6B is another timing diagram illustrating the implementation of the image sensing method of the present invention.
  • Table 1 below, in some embodiments, the blue unit pixel 123 in the light-emitting state is used as the light-emitting area 31 , and the red unit pixel 121 in the sensing state is used as the sensing area 32 . Also, in some embodiments, referring to FIG.
  • the definition step S 1 is performed, and the unit pixels 12 on the display device 100 alternately emit light, wherein when a part of the unit pixels 12 emit light, defined as in a light-emitting state; when another part of the unit pixels 12 do not emit light, defined as in the sensing state.
  • the light-emitting area step S 2 is executed, and the blue unit pixel 123 in the light-emitting state is used as the light-emitting area 31 ; followed by the sensing area step S 3 , wherein the red unit pixel 121 in the sensing state is used as the sensing area 32 .
  • the emission step S 4 is performed to drive a part of the blue unit pixels 123 in the light-emitting area 31 to emit an incident light R 1 to the test object 200 , and the incident light R 1 is reflected by the test object 200 to generate a reflected light R 2 .
  • the sensing step S 5 is performed to drive a portion of the red unit pixels 121 in the sensing area 32 to sense the reflected light R 2 , and the sensing area 32 generates a corresponding image electrical signal.
  • the aforementioned emission step S 4 and sensing step S 5 are repeated.
  • FIG. 6A Light-emitting area Blue unit pixels ON ON Sensing area Red unit pixels ON ON Green unit pixels OFF OFF
  • the implementation in an ideal state is as follows: First, a part of the blue unit pixels 123 in the light-emitting area 31 are driven to emit the incident light R 1 to the test object 200 , Next, while turning off the light-emitting area 31 , a part of the red unit pixels 121 in the sensing area 32 are driven to sense the reflected light R 2 .
  • FIG. 6B another embodiment according to the present invention is described as follows: First, a part of the blue unit pixels 123 in the light-emitting area 31 are driven to emit the incident light R 1 to the test object 200 , and the incident light R 1 emitted to the test object 200 is reflected to generate a reflected light R 2 .
  • the present invention is not limited hereto.
  • the unit pixels 12 in the light-emitting state are used as the light-emitter for under-screen fingerprint recognition
  • the unit pixels 12 in the sensing state are used as the sensor for under-screen fingerprint recognition
  • the present invention provides a high-performance image recognition without affecting the pixels of the panel.
  • FIG. 7 is a schematic view of a display device according to the first embodiment of the present invention.
  • the display device 100 according to the first embodiment of the present invention is applied to a fingerprint sensing system.
  • the display device 100 includes a substrate 11 , a plurality of unit pixels 12 , a cover panel 13 , and a readout circuit 18 .
  • the substrate 11 according to the first embodiment of the present invention has an upper surface 111 and a lower surface 112 , and the unit pixels 12 are disposed between the upper surface 111 of the substrate 11 and the cover panels 13 , in addition, the thickness of the cover panels 13 is about 700 microns, but the present invention is not limited hereto.
  • the unit pixels 12 according to the first embodiment of the present invention include red unit pixels 121 , green unit pixels 122 , and blue unit pixels 123 , but the present invention is not limited hereto.
  • the display device 100 according to the first embodiment of the present invention is an organic light-emitting diode display device.
  • the organic light-emitting diode display device can use, but is not limited to, fluorescent materials or phosphorescent materials as host material of the light-emitting layer, wherein the host material in the red unit pixel 121 , the green unit pixel 122 , and the blue unit pixel 123 can have different absorption spectra and light emission spectra, respectively, wherein the host material of the blue unit pixel 123 needs to absorb relatively stronger energy light to generate the light emission spectrum; the host material of the red unit pixel 121 can absorb relatively weaker energy light to generate the light emission spectrum.
  • the display device 100 according to the first embodiment of the present invention can generate corresponding image electrical signals by absorbing light with energy higher than its own energy.
  • the readout circuit 18 is coupled to each of the unit pixels 12 .
  • the readout circuit 18 receives the image electrical signal and generates the corresponding image information, but the invention is not limited hereto.
  • FIG. 8 is a flowchart illustrating the steps of performing the image sensing method according to the first embodiment of the present invention.
  • the present invention further provides an image sensing method, which can be applied to the display device 100 of the first embodiment, and the image sensing method includes the following steps:
  • Definition step S 1 ′ the unit pixels 12 on the display device 100 emit light alternately. When a part of the unit pixels 12 emit light, these unit pixels are defined as in a light-emitting state, and when another part of the unit pixels 12 do not emit light, these unit pixels are defined as in a sensing state; and proceed to light-emitting area step S 2 ′.
  • Light-emitting area step S 2 ′ the unit pixels 12 in the light-emitting state are used as a light-emitting area 31 ; and proceed to sensing area step S 3 ′.
  • Sensing area step S 3 ′ the unit pixels 12 in the sensing state are used as a sensing area 32 ; and proceed to emission step S 4 ′.
  • Emission step S 4 ′ a part of the unit pixels 12 in the light-emitting area 31 emit an incident light R 1 to the test object 200 , and the incident light R 1 emitted to the test object 200 is reflected to generate a reflected light R 2 , and proceed to sensing step S 5 ′.
  • Sensing step S 5 ′ a part of the unit pixels 12 in the sensing area 32 sense the reflected light R 2 , and the sensing area 32 generates a corresponding image electrical signal, and proceed to outputting step S 6 ′.
  • Output step S 6 ′ the readout circuit 18 receives the image electrical signal to generate corresponding image information.
  • FIG. 9A is a timing diagram illustrating the implementation of the image sensing method of the present invention
  • FIG. 9B is another timing diagram illustrating the implementation of the image sensing method of the present invention.
  • Table 2 below, in the first embodiment of the present invention, the blue unit pixel 123 in the light-emitting state is used as the light-emitting area 31 , and the red unit pixel 121 and the green unit pixel 122 in the sensing state are used as the sensing area 32 .
  • the blue unit pixel 123 in the light-emitting state is used as the light-emitting area 31
  • the red unit pixel 121 and the green unit pixel 122 in the sensing state are used as the sensing area 32 .
  • the definition step S 1 ′ is performed, and the unit pixels 12 on the display device 100 alternately emit light, wherein when a part of the unit pixels 12 emit light, defined as in a light-emitting state; when another part of the unit pixels 12 do not emit light, defined as in the sensing state.
  • the light-emitting area step S 2 ′ is executed, and the blue unit pixel 123 in the light-emitting state is used as the light-emitting area 31 ; followed by the sensing area step S 3 ′, wherein the red unit pixel 121 and the green unit pixel 122 in the sensing state are used as the sensing area 32 .
  • the emission step S 4 ′ is performed to drive a part of the blue unit pixels 123 in the light-emitting area 31 to emit an incident light R 1 to the test object 200 , and the incident light R 1 is reflected by the test object 200 to generate a reflected light R 2 .
  • the sensing step S 5 ′ is performed to drive a portion of the red unit pixels 121 in the sensing area 32 to sense the reflected light R 2 , and the sensing area 32 generates a corresponding image electrical signal.
  • the outputting step S 6 ′ is performed, and the readout circuit 18 receives the image electrical signal to generate a corresponding image information.
  • FIG. 9A Light-emitting area Blue unit pixels ON ON Sensing area Red unit pixels ON ON Green unit pixels ON ON
  • the red unit pixel 121 and the green unit pixel 122 in the sensing state are used as the sensing area 32 at the same time.
  • the reason is that different readout circuits 18 can be provided with the red unit pixel 121 the green unit pixel 122 to respectively generate corresponding image information.
  • the multiple image information can be mutually confirmed, which further improves the accuracy of image sensing by the display device 100 according to the present invention.
  • the present invention is not limited hereto.
  • the implementation in an ideal state is as follows: First, a part of the blue unit pixels 123 in the light-emitting area 31 are driven to emit the incident light R 1 to the test object 200 . Next, while turning off the light-emitting area 31 , a part of the red unit pixels 121 and a part of green unit pixels 122 in the sensing area 32 are driven to sense the reflected light R 2 .
  • FIG. 9B another embodiment according to the present invention is described as follows: First, a part of the blue unit pixels 123 in the light-emitting area 31 are driven to emit the incident light R 1 to the test object 200 , and the incident light R 1 emitted to the test object 200 is reflected to generate a reflected light R 2 .
  • the present invention is not limited hereto.
  • the unit pixels 12 in the light-emitting state are used as the light-emitter for under-screen fingerprint recognition
  • the unit pixels 12 in the sensing state are used as the sensor for under-screen fingerprint recognition
  • the present invention provides a high-performance image recognition without affecting the pixels of the panel.
  • the following provides other examples of the display device 100 , so that a person with ordinary knowledge in the technical field of the present invention can more clearly understand the possible modifications.
  • the elements indicated by the same element symbols as in the above embodiment are substantially the same as those described above with reference to FIGS. 1 and 2 .
  • the elements, features, and advantages that are the same as those of the display device 100 will not be repeated.
  • FIG. 10 is a schematic view of a display device 100 according to a second embodiment of the present invention.
  • the main structural difference of the second embodiment is that in the image sensor 100 of the second embodiment, the unit pixel 12 can be disposed on the lower surface 112 of the substrate 11 .
  • the materials and other characteristics used in the unit pixel 12 according to the second embodiment of the present invention are similar to those of the unit pixel 12 according to the first embodiment of the present invention, and will not be repeated here.
  • the image successfully provides a high-performance image recognition without affecting the pixels of the panel.
  • the issue of the decreasing gap between the sub-pixels of the OLED is successfully resolved, and the difficulty for under-screen fingerprint recognition technology to use the gap between the sub-pixels of the OLED allows light to pass is overcome, and the under screen fingerprint recognition technology can still be implemented on the high-pixel OLED panel.
  • the display device 100 according to the present invention not only serves as a light-emitting element, but also can be used as a sensing element for fingerprint image recognition, achieving the objectives of reducing costs and wide applicability.

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Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
TWI764608B (zh) * 2020-10-08 2022-05-11 大陸商廣州印芯半導體技術有限公司 一種顯示裝置及其影像感測方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140355846A1 (en) * 2014-06-05 2014-12-04 Secugen Corporation Fingerprint Sensing Apparatus
US20150348504A1 (en) * 2014-06-03 2015-12-03 LuxVue Technology Corporation Interactive display panel with emitting and sensing diodes
US20180357460A1 (en) * 2017-06-12 2018-12-13 Synaptics Incorporated Systems and methods for optical sensing using point-based illumination
US20210295076A1 (en) * 2020-03-18 2021-09-23 Shenzhen GOODIX Technology Co., Ltd. Fingerprint identification apparatus and electronic device
US20220050990A1 (en) * 2020-08-17 2022-02-17 Au Optronics Corporation Fingerprint sensing module

Family Cites Families (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7924272B2 (en) * 2006-11-27 2011-04-12 Microsoft Corporation Infrared sensor integrated in a touch panel
CN101840089B (zh) * 2009-03-17 2013-08-21 鸿富锦精密工业（深圳）有限公司 触控式显示装置
CN104103239B (zh) * 2014-06-23 2016-05-04 京东方科技集团股份有限公司 有机发光二极管像素电路及其驱动方法
CN106471457B (zh) * 2014-09-26 2020-07-17 深圳市汇顶科技股份有限公司 指纹传感器
US9342733B2 (en) * 2015-11-24 2016-05-17 Secugen Corporation Fingerprint sensing and calibration apparatus
CN105355171B (zh) * 2015-12-15 2019-01-11 惠州Tcl移动通信有限公司 驱动扫描电路、显示屏及移动终端
CN105609029B (zh) * 2016-03-24 2019-10-01 深圳市华星光电技术有限公司 感测amoled像素驱动特性的***及amoled显示装置
CN106326845B (zh) * 2016-08-15 2017-08-11 京东方科技集团股份有限公司 指纹识别单元及制作方法、阵列基板、显示装置及指纹识别方法
KR102566717B1 (ko) * 2016-12-12 2023-08-14 삼성전자 주식회사 생체 센서를 구비한 전자 장치
CN106897699B (zh) * 2017-02-24 2019-12-31 京东方科技集团股份有限公司 一种指纹识别器件、oled显示装置
KR102463734B1 (ko) * 2017-03-08 2022-11-04 삼성디스플레이 주식회사 발광 표시 장치
CN107025451B (zh) * 2017-04-27 2019-11-08 上海天马微电子有限公司 一种显示面板及显示装置
CN107204172B (zh) * 2017-06-02 2019-05-21 京东方科技集团股份有限公司 像素电路及其驱动方法、显示面板
CN107039002B (zh) * 2017-06-05 2019-09-06 京东方科技集团股份有限公司 一种像素电路及显示面板
CN107134259B (zh) * 2017-06-28 2019-04-30 京东方科技集团股份有限公司 像素电路、驱动方法、显示模组、驱动方法和显示装置
US10984213B2 (en) * 2018-03-27 2021-04-20 Shenzhen GOODIX Technology Co., Ltd. 3-dimensional optical topographical sensing of fingerprints using under-screen optical sensor module
CN110176203B (zh) * 2018-05-09 2021-03-16 京东方科技集团股份有限公司 阵列基板及显示装置
TWM577547U (zh) * 2018-08-01 2019-05-01 香港商印芯科技股份有限公司 屏下指紋辨識系統
CN109685003A (zh) * 2018-12-24 2019-04-26 武汉华星光电半导体显示技术有限公司 Oled显示面板及屏下光学指纹识别方法
US11250781B2 (en) * 2019-07-25 2022-02-15 Boe Technology Group Co., Ltd. Touch OLED display device, pixel circuit thereof and pixel driving method
TWI764608B (zh) * 2020-10-08 2022-05-11 大陸商廣州印芯半導體技術有限公司 一種顯示裝置及其影像感測方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150348504A1 (en) * 2014-06-03 2015-12-03 LuxVue Technology Corporation Interactive display panel with emitting and sensing diodes
US20140355846A1 (en) * 2014-06-05 2014-12-04 Secugen Corporation Fingerprint Sensing Apparatus
US20180357460A1 (en) * 2017-06-12 2018-12-13 Synaptics Incorporated Systems and methods for optical sensing using point-based illumination
US20210295076A1 (en) * 2020-03-18 2021-09-23 Shenzhen GOODIX Technology Co., Ltd. Fingerprint identification apparatus and electronic device
US20220050990A1 (en) * 2020-08-17 2022-02-17 Au Optronics Corporation Fingerprint sensing module

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