WO2020113651A1 - 具有屏下指纹识别的 oled 显示装置 - Google Patents

具有屏下指纹识别的 oled 显示装置 Download PDF

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Publication number
WO2020113651A1
WO2020113651A1 PCT/CN2018/121005 CN2018121005W WO2020113651A1 WO 2020113651 A1 WO2020113651 A1 WO 2020113651A1 CN 2018121005 W CN2018121005 W CN 2018121005W WO 2020113651 A1 WO2020113651 A1 WO 2020113651A1
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WO
WIPO (PCT)
Prior art keywords
thin film
fingerprint recognition
film transistor
electrically connected
oled display
Prior art date
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PCT/CN2018/121005
Other languages
English (en)
French (fr)
Inventor
李超
易士娟
Original Assignee
武汉华星光电半导体显示技术有限公司
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Application filed by 武汉华星光电半导体显示技术有限公司 filed Critical 武汉华星光电半导体显示技术有限公司
Priority to US16/342,211 priority Critical patent/US11114509B2/en
Publication of WO2020113651A1 publication Critical patent/WO2020113651A1/zh

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
    • 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
    • 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
    • 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
    • G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
    • 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
    • G06V40/1365—Matching; Classification
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/84—Passivation; Containers; Encapsulations
    • H10K50/844—Encapsulations
    • 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
    • H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
    • H10K59/1213—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements the pixel elements being TFTs
    • 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
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • 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
    • H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
    • 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
    • H10K59/80—Constructional details
    • H10K59/87—Passivation; Containers; Encapsulations
    • H10K59/873—Encapsulations

Definitions

  • the present invention relates to the field of display technology, and in particular to an OLED display device with under-screen fingerprint recognition.
  • flat panel display devices are widely used in mobile phones, TVs, personal digital assistants, digital cameras, notebook computers, desktops due to their advantages of high image quality, power saving, thin body, and wide range of applications.
  • Various consumer electronic products such as computers have become the mainstream in display devices.
  • Organic Light Emitting Display (Organic Light Emitting Display, OLED), because it also has self-illumination, no backlight, high contrast, thin thickness, wide viewing angle, fast response, can be used in flexible panels, wide temperature range, structure And the simple process and other excellent characteristics are considered to be the emerging application technology of the next generation flat panel display.
  • OLED Organic Light Emitting Display
  • OLED display devices generally include: a substrate, an anode provided on the substrate, a hole injection layer provided on the anode, a hole transport layer provided on the hole injection layer, a light emitting layer provided on the hole transport layer, and a device An electron transport layer on the light-emitting layer, an electron injection layer provided on the electron transport layer, and a cathode provided on the electron injection layer.
  • the principle of light emission of an OLED display device is that semiconductor materials and organic light-emitting materials are driven by an electric field to cause light emission through carrier injection and recombination.
  • OLED display devices usually use ITO pixel electrodes and metal electrodes as the anode and cathode of the device, respectively.
  • electrons and holes are injected from the cathode and anode into the electron transport layer and hole transport layer, respectively.
  • the holes migrate to the light-emitting layer through the electron-transport layer and the hole-transport layer, and meet in the light-emitting layer to form excitons and excite the light-emitting molecules, which emit visible light after radiation relaxation.
  • fingerprint recognition technology has the characteristics of universality, uniqueness, security and collectability. It has been widely used in smartphones and other products. With the rise of comprehensive screen technology, fingerprint recognition has gradually The design is developed from the outside of the display to the inside of the display, that is, the under-screen fingerprint recognition technology to pursue a higher screen ratio, but the working principle of the OLED display device with under-screen fingerprint recognition on the market is: OLED emits light After passing through the screen, through the reflection of the finger, it passes through the screen again, and is captured by the fingerprint recognition sensor. The fingerprint recognition sensor captures light to form photo-generated carriers, performs a fingerprint portrait, and then matches the previously recorded fingerprint to match and unlock. The existing technology needs to pass through during fingerprint recognition The penetration rate of each film layer in the display area is very low, resulting in low brightness received by the fingerprint recognition sensor, which reduces the accuracy of fingerprint recognition.
  • the object of the present invention is to provide an OLED display device with under-screen fingerprint recognition, which can reduce the film stacking of the fingerprint recognition block and improve the penetration rate of the fingerprint recognition block and the accuracy of fingerprint recognition.
  • the present invention provides an OLED display device with under-screen fingerprint recognition, including an OLED display panel and a fingerprint recognition module provided below the OLED display panel;
  • the OLED display panel includes a substrate and a plurality of sub-pixels arranged in an array on the substrate;
  • the substrate includes an effective display area, the sub-pixels are located in the effective display area, and a fingerprint identification block is provided in the effective display area, and the fingerprint identification module is disposed corresponding to the fingerprint identification block;
  • the number of thin film transistors in the sub-pixels located in the fingerprint identification block is less than the number of thin film transistors in the sub-pixels located outside the fingerprint identification block.
  • the OLED display panel further includes a protective coating on a side surface of the substrate close to the fingerprint recognition module, a plurality of sub-pixels arranged in the array, a package cover plate on the substrate, and a package cover plate on the package cover plate Screen protector.
  • the OLED display device with under-screen fingerprint recognition further includes a fingerprint recognition driving circuit board electrically connected to the fingerprint recognition module on a side of the fingerprint recognition module away from the substrate.
  • the effective display area and the fingerprint identification block are both rectangular, and the fingerprint identification block is located at a corner of the effective display area.
  • the substrate further includes a frame area surrounding the effective display area, and a first scan drive circuit and a second scan drive circuit are provided in the frame area, and the first scan drive circuit is used to drive the fingerprint identification area
  • the sub-pixels in the block emit light
  • the second scan driving circuit is used to drive the sub-pixels located outside the fingerprint identification block to emit light.
  • Each sub-pixel located in the fingerprint identification block includes a first thin film transistor, a second thin film transistor, a first storage capacitor, and a first organic light emitting diode;
  • the gate of the first thin film transistor is electrically connected to the first node, the source is electrically connected to the power supply voltage, and the drain is electrically connected to the anode of the first organic light emitting diode;
  • the gate of the second thin film transistor receives the switching signal, the source receives the data signal, and the drain is electrically connected to the first node;
  • the first end of the first storage capacitor is electrically connected to the first node, and the second end is electrically connected to the source of the first thin film transistor;
  • the cathode of the first organic light emitting diode is grounded
  • the switching signal is provided by the first scan driving circuit.
  • Each sub-pixel located outside the fingerprint identification block includes a third thin film transistor, a fourth thin film transistor, a fifth thin film transistor, a sixth thin film transistor, a seventh thin film transistor, an eighth thin film transistor, a ninth thin film transistor , A second storage capacitor and a second organic light-emitting diode;
  • the gate of the third thin film transistor receives the first scan signal, the source is electrically connected to the second node, and the drain is electrically connected to the third node;
  • the gate of the fourth thin film transistor receives the second scan signal, the source is electrically connected to the second node, and the drain is electrically connected to the source of the seventh thin film transistor;
  • the gate of the fifth thin film transistor receives the light emission control signal, the source receives the power supply voltage, and the drain is electrically connected to the source of the ninth thin film transistor;
  • the gate of the sixth thin film transistor receives the light emission control signal, the source is electrically connected to the third node, and the drain is electrically connected to the anode of the second organic light emitting diode;
  • the gate of the seventh thin film transistor receives the third scan signal, the source receives the initialization voltage, and the drain is electrically connected to the anode of the second organic light emitting diode;
  • the gate of the eighth thin film transistor receives the first scan signal, the source receives the data signal, and the drain is electrically connected to the source of the ninth thin film transistor;
  • the gate of the ninth thin film transistor is electrically connected to the second node, and the drain is electrically connected to the third node;
  • a first node and a second node of the second storage capacitor, and the second terminal is electrically connected to the source of the fifth thin film transistor;
  • the cathode of the second organic light emitting diode is grounded
  • the first scan signal, the second scan signal, the third scan signal and the light emission control signal are all provided by the second scan driving circuit.
  • the second scan drive circuit includes a first scan drive unit and a second scan drive unit located on both sides of the effective display area, the first scan drive circuit and the second scan drive unit are arranged in the The same side of the effective display area.
  • the fingerprint identification module is a fingerprint identification sensor.
  • the substrate is a transparent substrate.
  • the present invention provides an OLED display device with under-screen fingerprint recognition, including an OLED display panel and a fingerprint recognition module disposed below the OLED display panel;
  • the OLED display panel includes a substrate and the substrate A plurality of sub-pixels arranged in an array on the substrate;
  • the substrate includes an effective display area, the sub-pixels are located in the effective display area, a fingerprint identification block is provided in the effective display area, and the fingerprint identification module corresponds to the The fingerprint identification block setting;
  • the number of thin film transistors in the sub-pixels located in the fingerprint identification block is less than the number of thin film transistors in the sub-pixels located outside the fingerprint identification block, by reducing the fingerprint identification block
  • the number of thin film transistors in the sub-pixels inside can reduce the film stacking of the fingerprint identification block, and improve the penetration rate of the fingerprint identification block and the accuracy of fingerprint identification.
  • FIG. 1 is a schematic diagram of an OLED display device with under-screen fingerprint recognition of the present invention
  • FIG. 2 is a schematic diagram of an OLED display panel in an OLED display device with under-screen fingerprint recognition of the present invention
  • FIG. 3 is a circuit diagram of sub-pixels located in the fingerprint identification block in the OLED display device with under-screen fingerprint identification of the present invention
  • FIG. 4 is a circuit diagram of a sub-pixel located outside the fingerprint recognition block in an OLED display device with under-screen fingerprint recognition of the present invention
  • FIG. 5 is a waveform diagram of a second scan driving circuit of an OLED display device with under-screen fingerprint recognition of the present invention
  • FIG. 6 is a waveform diagram of a first scan driving circuit in an OLED display device with under-screen fingerprint recognition of the present invention.
  • the present invention provides an OLED display device with under-screen fingerprint recognition, including an OLED display panel 1 and a fingerprint recognition module 2 provided below the OLED display panel 1;
  • the OLED display panel 1 includes a substrate 11 and a plurality of sub-pixels 12 arranged in an array on the substrate 11;
  • the substrate 11 includes an effective display area 111, the sub-pixel 11 is located in the effective display area 111, and a fingerprint identification block 21 is provided in the effective display area 111, and the fingerprint identification module 2 corresponds to the fingerprint identification Block 21 settings;
  • the number of thin film transistors in the sub-pixels 12 located in the fingerprint identification block 21 is less than the number of thin film transistors in the sub-pixels 12 located outside the fingerprint identification block 21.
  • the OLED display panel 1 further includes a protective coating 13 on a surface of the substrate 11 close to the fingerprint recognition module 2, a plurality of sub-pixels 12 arranged in the array, and The package cover 14 on the substrate 11 and the screen protection layer 15 on the package cover 14.
  • the substrate 11 is a transparent substrate.
  • the OLED display device with under-screen fingerprint recognition further includes a fingerprint recognition driving circuit board 3 electrically connected to the fingerprint recognition module 2 on a side of the fingerprint recognition module 2 away from the substrate 11.
  • the substrate 11 further includes a frame area 112 surrounding the effective display area 111, and a first scan drive circuit 113 and a second scan drive circuit 114 are provided in the frame area 112, the first scan drive circuit 113 is used to drive the sub-pixels 12 located in the fingerprint identification block 21 to emit light, and the second scan driving circuit 114 is used to drive the sub-pixels 12 located outside the fingerprint identification block 21 to emit light.
  • the second scan driving circuit 114 includes a first scan driving unit 1141 and a second scan driving unit 1142 located on both sides of the effective display area 111 respectively.
  • the driving circuit 113 and the second scanning driving unit 1142 are arranged on the same side of the effective display area 111.
  • the effective display area 111 and the fingerprint identification block 21 are both rectangular, and the fingerprint identification block 21 is located at a corner of the effective display area 111.
  • the fingerprint identification block 21 is located at a corner of the first side of the effective display area 111, and the first scan driving unit 1141 is located at the On the second side opposite to the first side, the second scan driving unit 1142 and the first scan driving circuit 113 are both located on the first side of the effective display area 111, and the first scan circuit 113 is The fingerprint identification block 21 is opposite, corresponding to FIG.
  • the fingerprint identification block 21 is located in the lower right corner of the effective display area 111, and the first scan driving unit 1141 is located in the effective display area 111
  • the second scan driving unit 1142 and the first scan driving circuit 113 are both located on the right side of the effective display area 111, and the first scan circuit 113 is located below the second scan driving unit 1142 It is opposite to the fingerprint identification block 21.
  • each sub-pixel 12 located in the fingerprint identification block 21 includes a first thin film transistor T1, a second thin film transistor T2, a first Storage capacitor C1 and the first organic light-emitting diode D1;
  • the gate of the first thin film transistor T1 is electrically connected to the first node A, the source is electrically connected to the power supply voltage Vdd, and the drain is electrically connected to the anode of the first organic light emitting diode D1;
  • the gate of the second thin film transistor T1 receives the switching signal Switch, the source receives the data signal Data, and the drain is electrically connected to the first node A;
  • the first end of the first storage capacitor C1 is electrically connected to the first node A, and the second end is electrically connected to the source of the first thin film transistor T1;
  • the cathode of the first organic light emitting diode D1 is grounded;
  • the switching signal Switch is provided by the first scan driving circuit 113.
  • each sub-pixel 12 located outside the fingerprint identification block 21 includes a third thin film transistor T3, a fourth thin film transistor T4, and a fifth Thin film transistor T5, sixth thin film transistor T6, seventh thin film transistor T7, eighth thin film transistor T8, ninth thin film transistor T9, second storage capacitor C2 and second organic light emitting diode D2;
  • the gate of the third thin film transistor T3 receives the first scan signal Scan1, the source is electrically connected to the second node B, and the drain is electrically connected to the third node C;
  • the gate of the fourth thin film transistor T4 receives the second scan signal Scan2, the source is electrically connected to the second node B, and the drain is electrically connected to the source of the seventh thin film transistor T7;
  • the gate of the fifth thin film transistor T5 receives the light emission control signal EM, the source receives the power supply voltage Vdd, and the drain is electrically connected to the source of the ninth thin film transistor T9;
  • the gate of the sixth thin film transistor T6 receives the light emission control signal EM, the source is electrically connected to the third node C, and the drain is electrically connected to the anode of the second organic light emitting diode D2;
  • the gate of the seventh thin film transistor T7 receives the third scan signal Scan3, the source receives the initialization voltage Vi, and the drain is electrically connected to the anode of the second organic light emitting diode D2;
  • the gate of the eighth thin film transistor T8 receives the first scan signal Scan1, the source receives the data signal Data, and the drain is electrically connected to the source of the ninth thin film transistor T9;
  • the gate of the ninth thin film transistor T9 is electrically connected to the second node B, and the drain is electrically connected to the third node C;
  • the first end and the second node B of the second storage capacitor C2 are electrically connected to the source of the fifth thin film transistor T5;
  • the cathode of the second organic light emitting diode D2 is grounded;
  • the first scan signal Scan1, the second scan signal Scan2, the third scan signal Scan3, and the light emission control signal EM are all provided by the second scan driving circuit 114.
  • the first scan signal Scan1 is a scan signal of the pixel row where the sub-pixel 12 is located
  • the second scan signal Scan2 is a scan signal of the previous row of the pixel row where the sub-pixel 12 is located
  • the third scan signal Scan3 It is an inverted signal of the first scan signal Scan1.
  • the first to ninth thin film transistors T1 to T9 are all P-type thin film transistors.
  • the third thin film transistor T3 and the fourth thin film transistor T4 are composed of two P-type thin film transistors. Composed in series.
  • connection lines of the sub-pixels 12 of each row and the first scan driving circuit 113 and the second scan driving circuit 114 are divided into two blocks, wherein each row of sub-pixels 12 in the first block is located in the fingerprint recognition Outside the block 21, that is, each row of sub-pixels 12 in the first block does not include the sub-pixels 12 located in the fingerprint identification block 21, each row of sub-pixels 12 in the first block passes through The signal lines of the entire row of sub-pixels 12 are connected to the second scan driving circuit 114; and each row of sub-pixels 12 in the second block includes a number of sub-pixels 12 located in the fingerprint recognition block 21 and a number of For the sub-pixels 12 outside the fingerprint identification block 21, in each row of sub-pixels 12 in the second block, the sub-pixels 12 located in the fingerprint identification block 21 are connected to the first scan driving circuit 113 through the first signal line, The sub-pixels 12 located outside the fingerprint recognition block 21 are connected to the second scan driving circuit 114 through the second signal line, and the first
  • each row of sub-pixels 12 located above the fingerprint identification block 21 is provided with a scanning signal line 31 electrically connected to the row of sub-pixels 12 and an electrical connection.
  • One light emission control signal line 32 of each row of sub-pixels 12, each one scan signal line 31 and both ends of each light emission control signal line 32 are electrically connected to the first scan driving unit 1141 and the second scan driving unit 1142 respectively, corresponding to
  • Each row of sub-pixels located on the left side of the fingerprint identification block 21 is provided with a scanning signal line 31 electrically connected to the row of sub-pixels 12 and a light-emitting control signal line 32 electrically connected to the row of sub-pixels 12, each scanning The signal line 31 and the left end of each light-emitting control signal line 32 are electrically connected to the first scan driving unit 1141 respectively, corresponding to each row of sub-pixels located on the left side of the fingerprint recognition block 21 is provided with a switch electrically connected to the row of sub-pixels 12 In the signal line 33
  • the first scan signal STV1, the clock signal CK and the inverted clock signal XCK are first provided to the second scan driving circuit 114, so that each row of sub-pixels 13 is scanned row by row from top to bottom,
  • the second scan driving circuit 113 is provided with the second start signal STV2, the clock signal CK, and the inverted clock signal XCK.
  • the sub-pixels 12 in the identification block 21 are scanned.
  • the first scan driving unit 1141 and the second scan driving unit 1142 each include a light emitting signal generating unit and a scan signal generating unit, the light emitting signal generating unit is used to generate and drive the fingerprint recognition block 21
  • the scan signal generating unit is used to generate the first scan signal Scan1, the second scan signal Scan2 and the first scan signal to drive the sub-pixel 12 located outside the fingerprint recognition block 21
  • the first scan driving circuit 113 and the second scan driving circuit 114 are both array substrate row drive (Gate on array, GOA) circuits.
  • the fingerprint recognition module 2 is a fingerprint recognition sensor.
  • each sub-pixel 12 emits light through the cover plate 14 and the screen protection layer 15 to illuminate the finger, and then passes through the screen protection layer 15 and the cover again after being reflected by the finger
  • the board 14, the sub-pixels 12 and the substrate 11 are irradiated to the fingerprint recognition module 2.
  • the fingerprint recognition module 2 captures light to form photo-generated carriers, performs fingerprint portraits, and then matches and unlocks the previously recorded fingerprints.
  • the number of thin-film transistors of the pixel 12 is small, so the film stacking of the fingerprint identification block can be reduced, the penetration rate of the fingerprint identification block is higher, and the loss when light is irradiated back to the fingerprint identification module 2 is less. The accuracy is higher.
  • the present invention provides an OLED display device with under-screen fingerprint recognition, which includes an OLED display panel and a fingerprint recognition module disposed below the OLED display panel;
  • the OLED display panel includes a substrate and the substrate A plurality of sub-pixels arranged in an array of;
  • the substrate includes an effective display area, the sub-pixels are located in the effective display area, and a fingerprint identification block is provided in the effective display area, and the fingerprint identification module corresponds to the Fingerprint identification block setting;
  • the number of thin film transistors in the sub-pixels located in the fingerprint identification block is less than the number of thin-film transistors in the sub-pixels located outside the fingerprint identification block, by reducing the number of fingerprint identification blocks
  • the number of thin film transistors in the sub-pixels can reduce the film stacking of the fingerprint recognition block, improve the penetration rate of the fingerprint recognition block and the accuracy of fingerprint recognition.

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Abstract

一种具有屏下指纹识别的OLED显示装置，包括OLED显示面板(1)及设于OLED显示面板(1)下方的指纹识别模块(2)；所述OLED显示面板(1)包括基板(11)及设于所述基板(11)上的阵列排布的多个子像素(12)；所述基板包括有效显示区(111)，所述子像素(12)位于所述有效显示区(111)内，所述有效显示区(111)内设有指纹识别区块(21)，所述指纹识别模块(2)对应所述指纹识别区块(21)设置；位于所述指纹识别区块(21)内的子像素(12)中的薄膜晶体管的数量少于位于所述指纹识别区块(21)外的子像素(12)中的薄膜晶体管的数量。通过减少指纹识别区块(21)内的子像素(12)中的薄膜晶体管数量，能够减少指纹识别区块(21)的膜层堆叠，提升指纹识别区块(21)的穿透率和指纹识别的准确率。

Description

具有屏下指纹识别的OLED显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种具有屏下指纹识别的OLED显示装置。
 背景技术
随着显示技术的发展，平板显示装置因具有高画质、省电、机身薄及应用范围广等优点，而被广泛的应用于手机、电视、个人数字助理、数字相机、笔记本电脑、台式计算机等各种消费性电子产品，成为显示装置中的主流。
有机发光二极管显示器件（Organic Light Emitting Display，OLED）由于同时具备自发光，不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广、构造及制程较简单等优异特性，被认为是下一代平面显示器的新兴应用技术。
OLED显示器件通常包括：基板、设于基板上的阳极、设于阳极上的空穴注入层、设于空穴注入层上的空穴传输层、设于空穴传输层上的发光层、设于发光层上的电子传输层、设于电子传输层上的电子注入层、及设于电子注入层上的阴极。OLED显示器件的发光原理为半导体材料和有机发光材料在电场驱动下，通过载流子注入和复合导致发光。具体的，OLED显示器件通常采用ITO像素电极和金属电极分别作为器件的阳极和阴极，在一定电压驱动下，电子和空穴分别从阴极和阳极注入到电子传输层和空穴传输层，电子和空穴分别经过电子传输层和空穴传输层迁移到发光层，并在发光层中相遇，形成激子并使发光分子激发，后者经过辐射弛豫而发出可见光。
指纹识别技术作为生物识别技术中的一种，具有普遍性、唯一性、安全性及可采集性等特点，已经在智能手机等产品中广泛应用，随着全面屏技术兴起，指纹识别也逐渐由设计在显示屏外部发展至设计到显示屏内部，即屏下指纹识别技术，以追求更高的屏占比，但目前市场上的具有屏下指纹识别的OLED显示装置的工作原理为：OLED发光穿过屏幕经手指反射再次穿过屏幕，被指纹识别传感器捕捉，指纹识别传感器捕捉光形成光生载流子，进行指纹画像，再和之前录制指纹进行匹配解锁，现有技术在指纹识别时需要穿越显示区中各膜层，穿透率很低，导致指纹识别传感器接收到的亮度低，降低了指纹识别的准确度。
 技术问题
本发明的目的在于提供一种具有屏下指纹识别的OLED显示装置，能够减少指纹识别区块的膜层堆叠，提升指纹识别区块的穿透率和指纹识别的准确率。
 技术解决方案
为实现上述目的，本发明提供了一种具有屏下指纹识别的OLED显示装置，包括OLED显示面板及设于OLED显示面板下方的指纹识别模块；
所述OLED显示面板包括基板及设于所述基板上的阵列排布的多个子像素；
所述基板包括有效显示区，所述子像素位于所述有效显示区内，所述有效显示区内设有指纹识别区块，所述指纹识别模块对应所述指纹识别区块设置；
位于所述指纹识别区块内的子像素中的薄膜晶体管的数量少于位于所述指纹识别区块外的子像素中的薄膜晶体管的数量。
所述OLED显示面板还包括位于基板靠近所述指纹识别模块的一侧表面上的保护涂层、位于所述阵列排布的多个子像素及基板上的封装盖板及位于所述封装盖板上的屏幕保护层。
所述具有屏下指纹识别的OLED显示装置还包括位于所述指纹识别模块远离所述基板的一侧与所述指纹识别模块电性连接的指纹识别驱动电路板。
所述有效显示区及指纹识别区块均为矩形，所述指纹识别区块位于所述有效显示区的一角。
所述基板还包括包围所述有效显示区的边框区，所述边框区内设有第一扫描驱动电路和第二扫描驱动电路，所述第一扫描驱动电路用于驱动位于所述指纹识别区块内的子像素发光，所述第二扫描驱动电路用于驱动位于所述指纹识别区块外的子像素发光。
所述位于所述指纹识别区块内的每一子像素包括第一薄膜晶体管、第二薄膜晶体管、第一存储电容及第一有机发光二极管；
所述第一薄膜晶体管的栅极电性连接第一节点，源极电性连接电源电压，漏极电性连接第一有机发光二极管的阳极；
所述第二薄膜晶体管的栅极接收开关信号，源极接收数据信号，漏极电性连接第一节点；
所述第一存储电容的第一端电性连接第一节点，第二端电性连接所述第一薄膜晶体管的源极；
所述第一有机发光二极管的阴极接地；
所述开关信号由所述第一扫描驱动电路提供。
所述位于所述指纹识别区块外的每一子像素包括第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管、第七薄膜晶体管、第八薄膜晶体管、第九薄膜晶体管、第二存储电容及第二有机发光二极管；
所述第三薄膜晶体管的栅极接收第一扫描信号，源极电性连接第二节点，漏极电性连接第三节点；
所述第四薄膜晶体管的栅极接收第二扫描信号，源极电性连接第二节点，漏极电性连接第七薄膜晶体管的源极；
所述第五薄膜晶体管的栅极接收发光控制信号，源极接收电源电压，漏极电性连接第九薄膜晶体管的源极；
所述第六薄膜晶体管的栅极接收发光控制信号，源极电性连接第三节点，漏极电性连接第二有机发光二极管的阳极；
所述第七薄膜晶体管的栅极接收第三扫描信号，源极接收初始化电压，漏极电性连接第二有机发光二极管的阳极；
所述第八薄膜晶体管的栅极接收第一扫描信号，源极接收数据信号，漏极电性连接第九薄膜晶体管的源极；
所述第九薄膜晶体管的栅极电性连接第二节点，漏极电性连接第三节点；
所述第二存储电容的第一端第二节点，第二端电性连接第五薄膜晶体管的源极；
所述第二有机发光二极管的阴极接地；
所述第一扫描信号、第二扫描信号、第三扫描信号及发光控制信号均由第二扫描驱动电路提供。
所述第二扫描驱动电路包括分别位于所述有效显示区的两侧的第一扫描驱动单元和第二扫描驱动单元，所述第一扫描驱动电路与所述第二扫描驱动单元排列于所述有效显示区的同一侧。
所述指纹识别模块为一指纹识别传感器。
所述基板为透明基板。
 有益效果
本发明的有益效果：本发明提供一种具有屏下指纹识别的OLED显示装置，包括OLED显示面板及设于OLED显示面板下方的指纹识别模块；所述OLED显示面板包括基板及设于所述基板上的阵列排布的多个子像素；所述基板包括有效显示区，所述子像素位于所述有效显示区内，所述有效显示区内设有指纹识别区块，所述指纹识别模块对应所述指纹识别区块设置；位于所述指纹识别区块内的子像素中的薄膜晶体管的数量少于位于所述指纹识别区块外的子像素中的薄膜晶体管的数量，通过减少指纹识别区块内的子像素中的薄膜晶体管数量，能够减少指纹识别区块的膜层堆叠，提升指纹识别区块的穿透率和指纹识别的准确率。
 附图说明
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图中，
图1为本发明具有屏下指纹识别的OLED显示装置的示意图；
图2为本发明具有屏下指纹识别的OLED显示装置中OLED显示面板的示意图；
图3为本发明具有屏下指纹识别的OLED显示装置中位于所述指纹识别区块内的子像素的电路图；
图4为本发明具有屏下指纹识别的OLED显示装置中位于所述指纹识别区块外的子像素的电路图；
图5为本发明的具有屏下指纹识别的OLED显示装置的第二扫描驱动电路的波形图；
图6为本发明的具有屏下指纹识别的OLED显示装置中第一扫描驱动电路的波形图。
 本发明的实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图1至图4，本发明提供一种具有屏下指纹识别的OLED显示装置，包括OLED显示面板1及设于OLED显示面板1下方的指纹识别模块2；
所述OLED显示面板1包括基板11及设于所述基板11上的阵列排布的多个子像素12；
所述基板11包括有效显示区111，所述子像素11位于所述有效显示区111内，所述有效显示区111内设有指纹识别区块21，所述指纹识别模块2对应所述指纹识别区块21设置；
位于所述指纹识别区块21内的子像素12中的薄膜晶体管的数量少于位于所述指纹识别区块21外的子像素12中的薄膜晶体管的数量。
具体地，如图1所示，所述OLED显示面板1还包括位于基板11靠近所述指纹识别模块2的一侧表面上的保护涂层13、位于所述阵列排布的多个子像素12及基板11上的封装盖板14及位于所述封装盖板14上的屏幕保护层15。
具体地，所述基板11为透明基板。
进一步地，所述具有屏下指纹识别的OLED显示装置还包括位于所述指纹识别模块2远离所述基板11的一侧与所述指纹识别模块2电性连接的指纹识别驱动电路板3。
进一步地，所述基板11还包括包围所述有效显示区111的边框区112，所述边框区112内设有第一扫描驱动电路113和第二扫描驱动电路114，所述第一扫描驱动电路113用于驱动位于所述指纹识别区块21内的子像素12发光，所述第二扫描驱动电路114用于驱动位于所述指纹识别区块21外的子像素12发光。
具体实施时，如图2所示，所述第二扫描驱动电路114包括分别位于所述有效显示区111的两侧的第一扫描驱动单元1141和第二扫描驱动单元1142，所述第一扫描驱动电路113与所述第二扫描驱动单元1142排列于所述有效显示区111的同一侧。
优选地，在本发明的一些实施例中，所述有效显示区111及指纹识别区块21均为矩形，所述指纹识别区块21位于所述有效显示区111的一角。
进一步地，在本发明的一些实施例中，所述指纹识别区块21位于所述有效显示区111的第一侧的角落，所述第一扫描驱动单元1141位于所述有效显示区111的与所述第一侧相对的第二侧，所述第二扫描驱动单元1142与所述第一扫描驱动电路113均位于所述有效显示区111的第一侧，且所述第一扫描电路113与所述指纹识别区块21相对，对应图2所示，即为所述指纹识别区块21位于所述有效显示区111的右下角，所述第一扫描驱动单元1141位于所述有效显示区111的左侧，所述第二扫描驱动单元1142与所述第一扫描驱动电路113均位于所述有效显示区111的右侧，且所述第一扫描电路113位于第二扫描驱动单元1142的下方与所述指纹识别区块21相对。
具体地，如图3所示，在本发明的一些实施例中，所述位于所述指纹识别区块21内的每一子像素12包括第一薄膜晶体管T1、第二薄膜晶体管T2、第一存储电容C1及第一有机发光二极管D1；
所述第一薄膜晶体管T1的栅极电性连接第一节点A，源极电性连接电源电压Vdd，漏极电性连接第一有机发光二极管D1的阳极；
所述第二薄膜晶体管T1的栅极接收开关信号Switch，源极接收数据信号Data，漏极电性连接第一节点A；
所述第一存储电容C1的第一端电性连接第一节点A，第二端电性连接所述第一薄膜晶体管T1的源极；
所述第一有机发光二极管D1的阴极接地；
所述开关信号Switch由所述第一扫描驱动电路113提供。
具体地，如图4所示，在本发明的一些实施例中，所述位于所述指纹识别区块21外的每一子像素12包括第三薄膜晶体管T3、第四薄膜晶体管T4、第五薄膜晶体管T5、第六薄膜晶体管T6、第七薄膜晶体管T7、第八薄膜晶体管T8、第九薄膜晶体管T9、第二存储电容C2及第二有机发光二极管D2；
所述第三薄膜晶体管T3 的栅极接收第一扫描信号Scan1，源极电性连接第二节点B，漏极电性连接第三节点C；
所述第四薄膜晶体管T4的栅极接收第二扫描信号Scan2，源极电性连接第二节点B，漏极电性连接第七薄膜晶体管T7的源极；
所述第五薄膜晶体管T5的栅极接收发光控制信号EM，源极接收电源电压Vdd，漏极电性连接第九薄膜晶体管T9的源极；
所述第六薄膜晶体管T6的栅极接收发光控制信号EM，源极电性连接第三节点C，漏极电性连接第二有机发光二极管D2的阳极；
所述第七薄膜晶体管T7的栅极接收第三扫描信号Scan3，源极接收初始化电压Vi，漏极电性连接第二有机发光二极管D2的阳极；
所述第八薄膜晶体管T8的栅极接收第一扫描信号Scan1，源极接收数据信号Data，漏极电性连接第九薄膜晶体管T9的源极；
所述第九薄膜晶体管T9的栅极电性连接第二节点B，漏极电性连接第三节点C；
所述第二存储电容C2的第一端第二节点B，第二端电性连接第五薄膜晶体管T5的源极；
所述第二有机发光二极管D2的阴极接地；
所述第一扫描信号Scan1、第二扫描信号Scan2、第三扫描信号Scan3及发光控制信号EM均由第二扫描驱动电路114提供。
具体地，所述第一扫描信号Scan1为该子像素12所在的像素行的扫描信号，所述第二扫描信号Scan2该子像素12所在的像素行的上一行的扫描信号，第三扫描信号Scan3为第一扫描信号Scan1的反相信号，所述第一至第九薄膜晶体管T1~T9均为P型薄膜晶体管，所述第三薄膜晶体管T3和第四薄膜晶体管T4由两个P型薄膜晶体管串联组成。
具体连接时，所述各行子像素12与第一扫描驱动电路113和第二扫描驱动电路114的连接线路分成两个区块，其中第一个区块中的每一行子像素12均位于指纹识别区块21外，即第一个区块中的每一行子像素12均不包含位于指纹识别区块21内的子像素12，在第一个区块中的每一行子像素12均通过穿过整行子像素12的信号线连接所述第二扫描驱动电路114；而第二个区块中的每一行子像素12均包括若干个位于指纹识别区块21内的子像素12和若干个位于指纹识别区块21外的子像素12，在第二个区块中的每一行子像素12中，位于指纹识别区块21内的子像素12通过第一信号线连接第一扫描驱动电路113，位于指纹识别区块21外的子像素12通过第二信号线连接第二扫描驱动电路114，第一信号线与第二信号线相互绝缘。
对应到上述的实施例中，如图2所示，即为对应位于指纹识别区块21上方的每一行子像素12分别设置电性连接该行子像素12的一条扫描信号线31和电性连接该行子像素12的一条发光控制信号线32，每一条一条扫描信号线31和每一条发光控制信号线32的两端分别电性连接第一扫描驱动单元1141和第二扫描驱动单元1142，对应位于所述指纹识别区块21左侧的每一行子像素设置电性连接该行子像素12的一条扫描信号线31和电性连接该行子像素12的一条发光控制信号线32，每一条扫描信号线31和每一条发光控制信号线32的左端分别电性连接第一扫描驱动单元1141，对应位于指纹识别区块21左侧的每一行子像素设置电性连接该行子像素12的一条开关信号线33，每一条开关信号线33的右端电性连接第一扫描驱动电路113。
进一步地，如图5及图6所示，先向第二扫描驱动电路114提供第一启动信号STV1、时钟信号CK及反相时钟信号XCK，使得各行子像素13从上往下逐行扫描，扫描到指纹识别区块21中的的第一行子像素12的上两行子像素时，向第一扫描驱动电路113提供第二启动信号STV2、时钟信号CK及反相时钟信号XCK，对指纹识别区块21中的子像素12进行扫描。
具体地，所述第一扫描驱动单元1141和第二扫描驱动单元1142均包括发光信号产生单元和扫描信号产生单元，所述发光信号产生单元用于产生驱动所述位于所述指纹识别区块21外的子像素12的发光控制信号EM，所述扫描信号产生单元用于产生驱动所述位于所述指纹识别区块21外的子像素12的第一扫描信号Scan1、第二扫描信号Scan2及第三扫描信号Scan3。
具体地，所述第一扫描驱动电路113和第二扫描驱动电路114均为阵列基板行驱动（Gate on array，GOA）电路。
具体地，所述指纹识别模块2为一指纹识别传感器，工作时，各个子像素12发光穿过盖板14和屏幕保护层15照到手指上，经手指反射再次穿过屏幕保护层15、盖板14、子像素12及基板11照射到指纹识别模块2，指纹识别模块2捕捉光形成光生载流子，进行指纹画像，再和之前录制指纹进行匹配解锁，由于指纹识别区块21中的子像素12的薄膜晶体管的数量较少，因而能够减少指纹识别区块的膜层堆叠，指纹识别区块的穿透率更高，在光线照射回指纹识别模块2时的损失更少，指纹识别的准确率更高。
综上所述，本发明提供一种具有屏下指纹识别的OLED显示装置，包括OLED显示面板及设于OLED显示面板下方的指纹识别模块；所述OLED显示面板包括基板及设于所述基板上的阵列排布的多个子像素；所述基板包括有效显示区，所述子像素位于所述有效显示区内，所述有效显示区内设有指纹识别区块，所述指纹识别模块对应所述指纹识别区块设置；位于所述指纹识别区块内的子像素中的薄膜晶体管的数量少于位于所述指纹识别区块外的子像素中的薄膜晶体管的数量，通过减少指纹识别区块内的子像素中的薄膜晶体管数量，能够减少指纹识别区块的膜层堆叠，提升指纹识别区块的穿透率和指纹识别的准确率。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (10)

  1. 一种具有屏下指纹识别的OLED显示装置，包括OLED显示面板及设于OLED显示面板下方的指纹识别模块；
    所述OLED显示面板包括基板及设于所述基板上的阵列排布的多个子像素；
    所述基板包括有效显示区，所述子像素位于所述有效显示区内，所述有效显示区内设有指纹识别区块，所述指纹识别模块对应所述指纹识别区块设置；
    位于所述指纹识别区块内的子像素中的薄膜晶体管的数量少于位于所述指纹识别区块外的子像素中的薄膜晶体管的数量。
  2. 如权利要求1所述的具有屏下指纹识别的OLED显示装置，其中，所述OLED显示面板还包括位于基板靠近所述指纹识别模块的一侧表面上的保护涂层、位于所述阵列排布的多个子像素及基板上的封装盖板及位于所述封装盖板上的屏幕保护层。
  3. 如权利要求1所述的具有屏下指纹识别的OLED显示装置，还包括位于所述指纹识别模块远离所述基板的一侧与所述指纹识别模块电性连接的指纹识别驱动电路板。
  4. 如权利要求1所述的具有屏下指纹识别的OLED显示装置，其中，所述有效显示区及指纹识别区块均为矩形，所述指纹识别区块位于所述有效显示区的一角。
  5. 如权利要求1所述的具有屏下指纹识别的OLED显示装置，其中，所述基板还包括包围所述有效显示区的边框区，所述边框区内设有第一扫描驱动电路和第二扫描驱动电路，所述第一扫描驱动电路用于驱动位于所述指纹识别区块内的子像素发光，所述第二扫描驱动电路用于驱动位于所述指纹识别区块外的子像素发光。
  6. 如权利要求5所述的具有屏下指纹识别的OLED显示装置，其中，所述位于所述指纹识别区块内的每一子像素包括第一薄膜晶体管、第二薄膜晶体管、第一存储电容及第一有机发光二极管；
    所述第一薄膜晶体管的栅极电性连接第一节点，源极电性连接电源电压，漏极电性连接第一有机发光二极管的阳极；
    所述第二薄膜晶体管的栅极接收开关信号，源极接收数据信号，漏极电性连接第一节点；
    所述第一存储电容的第一端电性连接第一节点，第二端电性连接所述第一薄膜晶体管的源极；
    所述第一有机发光二极管的阴极接地；
    所述开关信号由所述第一扫描驱动电路提供。
  7. 如权利要求5所述的具有屏下指纹识别的OLED显示装置，其中，所述位于所述指纹识别区块外的每一子像素包括第三薄膜晶体管、第四薄膜晶体管、第五薄膜晶体管、第六薄膜晶体管、第七薄膜晶体管、第八薄膜晶体管、第九薄膜晶体管、第二存储电容及第二有机发光二极管；
    所述第三薄膜晶体管的栅极接收第一扫描信号，源极电性连接第二节点，漏极电性连接第三节点；
    所述第四薄膜晶体管的栅极接收第二扫描信号，源极电性连接第二节点，漏极电性连接第七薄膜晶体管的源极；
    所述第五薄膜晶体管的栅极接收发光控制信号，源极接收电源电压，漏极电性连接第九薄膜晶体管的源极；
    所述第六薄膜晶体管的栅极接收发光控制信号，源极电性连接第三节点，漏极电性连接第二有机发光二极管的阳极；
    所述第七薄膜晶体管的栅极接收第三扫描信号，源极接收初始化电压，漏极电性连接第二有机发光二极管的阳极；
    所述第八薄膜晶体管的栅极接收第一扫描信号，源极接收数据信号，漏极电性连接第九薄膜晶体管的源极；
    所述第九薄膜晶体管的栅极电性连接第二节点，漏极电性连接第三节点；
    所述第二存储电容的第一端第二节点，第二端电性连接第五薄膜晶体管的源极；
    所述第二有机发光二极管的阴极接地；
    所述第一扫描信号、第二扫描信号、第三扫描信号及发光控制信号均由第二扫描驱动电路提供。
  8. 如权利要求5所述的具有屏下指纹识别的OLED显示装置，其中，所述第二扫描驱动电路包括分别位于所述有效显示区的两侧的第一扫描驱动单元和第二扫描驱动单元，所述第一扫描驱动电路与所述第二扫描驱动单元排列于所述有效显示区的同一侧。
  9. 如权利要求1所述的具有屏下指纹识别的OLED显示装置，其中，所述指纹识别模块为一指纹识别传感器。
  10. 如权利要求1所述的具有屏下指纹识别的OLED显示装置，其中，所述基板为透明基板。
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