WO2018176805A1 - 一种显示面板、显示装置及其驱动方法 - Google Patents

一种显示面板、显示装置及其驱动方法 Download PDF

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Publication number
WO2018176805A1
WO2018176805A1 PCT/CN2017/106862 CN2017106862W WO2018176805A1 WO 2018176805 A1 WO2018176805 A1 WO 2018176805A1 CN 2017106862 W CN2017106862 W CN 2017106862W WO 2018176805 A1 WO2018176805 A1 WO 2018176805A1
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Prior art keywords
display panel
photosensitive sensing
display
pixel
sub
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PCT/CN2017/106862
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English (en)
French (fr)
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韩艳玲
郭玉珍
秦云科
贾亚楠
赵利军
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京东方科技集团股份有限公司
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Priority to US15/778,485 priority Critical patent/US20200134281A1/en
Publication of WO2018176805A1 publication Critical patent/WO2018176805A1/zh

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    • 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
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136209—Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/017—Gesture based interaction, e.g. based on a set of recognized hand gestures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • 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
    • H10K59/122—Pixel-defining structures or layers, e.g. banks
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133512—Light shielding layers, e.g. black matrix
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136222—Colour filters incorporated in the active matrix substrate
    • 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
    • H10K59/351—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
    • 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

Definitions

  • the present disclosure relates to the field of display technologies, and in particular, to a display panel, a display device, and a driving method thereof.
  • the fingerprint recognition devices integrated in the display panel have capacitive and ultrasonic types, each having advantages and disadvantages, but there is a common defect that the sensor sensing distance is short, which seriously limits the structure and performance of the fingerprint recognition device, affecting its Widely used in mobile terminal products.
  • Optical fingerprint recognition has the advantage of long-distance sensing due to the use of optical methods.
  • the Sensor due to the high resolution requirements of optical sensors, the Sensor can only be made small, and because the semaphore is usually the area of the Sensor. In proportion, then its semaphore will become quite weak.
  • the detection circuit Since the current signal is weak, the detection difficulty of the detection chip (IC) is increased. Therefore, the detection circuit is required to perform amplification, integration, noise reduction, etc., which increases the manufacturing cost of the IC.
  • Embodiments of the present disclosure provide a display panel including: a plurality of photosensitive sensing circuits arranged in an array, a plurality of scanning signal lines corresponding to the rows of the photosensitive sensing circuits, and the photosensitive sensing electrodes in each column a plurality of read signal lines and a plurality of drive signal lines corresponding to the circuit; each of the photosensitive sensing circuits includes: a photodiode, a switching transistor, and a sampling resistor; wherein
  • a gate of the switching transistor is connected to a corresponding scan signal line, a source of the switching transistor is connected to a cathode of the photodiode, and a drain of the switching transistor is associated with the corresponding Drive signal lines are connected;
  • a cathode of the photodiode is connected to a first end of the sampling resistor, and a second end of the sampling resistor is grounded;
  • the first end of the sampling resistor is connected to the corresponding read signal line.
  • the method further includes: at least one infrared emitting light source; the photodiode is an infrared photodiode;
  • the infrared emitting light source and the photosensitive sensing circuit do not overlap each other in a projection perpendicular to the direction of the display panel.
  • the display panel is divided into a display area and a frame area surrounding the display area; the photosensitive sensing circuit is located in the display area;
  • the display area further includes: a plurality of pixel units arranged in an array; at least a portion of the pixel units include at least four sub-pixel areas, wherein one of the sub-pixel areas is provided with one of the infrared emission sources, and the remaining sub-pixels
  • the pixel area sets the sub-pixel structure for display.
  • the projection of the photosensitive sensing circuit in a direction perpendicular to the display panel is located at a gap between the sub-pixel regions.
  • the sub-pixel structure is an organic electroluminescent device located on a substrate; protection is provided on a side of the organic electroluminescent device facing away from the substrate Cover plate
  • the photosensitive sensing circuit is located on a surface of the protective cover plate facing the organic electroluminescent device.
  • the sub-pixel structure is an organic electroluminescent device located on a substrate; a pixel defining layer is disposed between each of the sub-pixel regions;
  • the photosensitive sensing circuit is located between the pixel defining layer and the substrate.
  • the display panel is a liquid crystal display panel including opposite opposing substrates and an array substrate; and black is disposed on a side of the opposite substrate facing the array substrate matrix;
  • the photosensitive sensing circuit is located on a surface of the black matrix that faces away from the opposite substrate.
  • the display panel is a liquid crystal display panel, including opposite opposing substrates and an array substrate;
  • the photosensitive sensing circuit is located on a side of the array substrate facing the opposite substrate.
  • a color filter is disposed on a side of the opposite substrate facing the array substrate;
  • the infrared emitting light source comprises an infrared photoluminescent film layer, and the infrared photoluminescent film layer and the color filter are located in the same film layer.
  • the display panel is divided into a display area and a frame area surrounding the display area; the infrared emitting light source is located in the frame area.
  • the embodiment of the present disclosure further provides a display device, including the above display panel provided by the embodiment of the present disclosure.
  • the method further includes: a front camera.
  • the embodiment of the present disclosure further provides a driving method of the above display device, including:
  • At least an offset voltage is applied to each of the driving signal lines included in the required detection area, the bias voltage being greater than an avalanche voltage of the photodiode;
  • At least the scanning signal lines included in the required detection area are scanned line by line, and at least the output signals of the respective read signal lines included in the required detection area are acquired.
  • the offset voltage is applied to all of the driving signal lines
  • Each of the scanning signal lines is progressively scanned, and an output signal of each of the read signal lines is obtained.
  • the method when performing the hovering touch detection, the method further includes:
  • the front camera is used to acquire a gesture image to determine the coordinate position of the gesture plane.
  • the method further includes:
  • the required detection area is determined according to the determined gesture plane coordinate position.
  • FIG. 1 is a schematic structural diagram of a fingerprint detecting structure in the prior art
  • FIG. 2 is a schematic circuit diagram of a display panel according to an embodiment of the present disclosure
  • FIG. 3 is a signal timing diagram corresponding to FIG. 2;
  • FIG. 4 is a schematic top plan view of a display panel according to an embodiment of the present disclosure.
  • FIG. 8 are schematic side views showing the structure of a display panel according to an embodiment of the present disclosure.
  • each fingerprint detecting unit is composed of a photodiode D1 and a switching transistor T1.
  • the light source illuminates the finger and produces different reflections, so that the light intensity reaching the photodiode D1 changes, resulting in different photocurrent differences in the photodiode.
  • the D1 connected switching transistor T1 Under the control of the D1 connected switching transistor T1, the current difference of each photodiode D1 is sequentially read, and the detection of the fingerprint valley can be realized.
  • the drawback of this design is that the current generated by the valley ridge is very small. Under small light intensity, the current flowing through the read line Sline is small, and it is easily charged and discharged by other stray capacitances, and the scan lines of other lines are also gated. The influence of the leakage current of the switch is large, and the noise of the front end of the detection chip (IC) needs to be large due to the small current.
  • the high amplification factor requires a large resistance with high precision; the front-end amplifier has a lower bias current requirement. A large paranoid current consumes signal current and cannot even detect current. Both of these points will greatly increase the production cost of the IC and the size of the IC, resulting in a reduction in the possibility of mass production.
  • the present invention provides a display panel, a display device, and a driving method thereof, in view of the problem that the optical sensor current signal is weak and difficult to detect in the prior art.
  • the specific embodiments of the display panel, the display device, and the driving method thereof according to the embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the preferred embodiments described herein are intended to illustrate and explain the invention and are not intended to limit the invention. And in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.
  • the embodiment of the present disclosure provides a display panel, as shown in FIG. 2, including: a plurality of photosensitive sensing circuits 1 arranged in an array, and a plurality of scanning signal lines corresponding to the photosensitive sensing circuits 1 of each row. And a plurality of read signal lines Vout and a plurality of drive signal lines Drive lines corresponding to the columns of the photosensitive sensing circuits 2; each of the photosensitive sensor circuits 1 includes: a photodiode 11, a switching transistor 12, and a sampling resistor 13;
  • the gate of the switching transistor 12 is connected to the corresponding scanning signal line Gate, the source of the switching transistor 12 is connected to the cathode of the photodiode 11, and the drain of the switching transistor 12 is connected to the corresponding driving signal line Drive line;
  • the anode of the photodiode 11 is connected to the first end of the sampling resistor 13, and the second end of the sampling resistor 13 is grounded;
  • the first end of the sampling resistor 13 is connected to the corresponding read signal line Vout.
  • the on state of the connected switching transistor 12 is controlled by the scanning signal line Gate, and when the switching transistor 12 is turned on, the driving is utilized.
  • the signal line Drive line applies a bias voltage to the photodiode 11 that is greater than the avalanche voltage.
  • the texture recognition is performed, the infrared light reflected by the ridge causes reverse breakdown of the photodiode 11 to generate a large current, which is output to the read signal line Vout through the sampling resistor 13, and the current output from the photodiode 11 corresponding to the valley is zero, thereby Identify the valley ridge.
  • the photodiode 11 Since the photodiode 11 generates a large current when it is reversely broken when receiving the illumination, in the case of the texture recognition provided by the embodiment of the present disclosure, the difference between the detection signals between the valleys is large. Therefore, the difficulty of detecting the IC detection circuit can be reduced, and the detection accuracy of the texture recognition can be improved.
  • the method further includes: at least one infrared emitting light source 2; the photodiode 11 is an infrared photodiode;
  • the projections of the infrared emitting light source 2 and the photosensitive sensing circuit 1 in a direction perpendicular to the display panel do not overlap each other.
  • the photosensitive sensing circuit 1 can also implement the function of gesture recognition.
  • the gesture recognition is performed, since the hand distance display panel has a certain distance, the photosensitive sensor circuit 1 cannot detect the difference of the valley ridge, and the photodiode 11 only generates the corresponding output signal of the reflected light of the hand portion, and detects the reflection at different positions.
  • the light transmission and reception time difference can calculate the longitudinal coordinate of each part of the gesture, that is, the z coordinate.
  • the stereo coordinates of the gesture can be determined, thereby realizing gesture recognition.
  • the x, y coordinates obtained by calculating the signal difference outputted by the photosensitive sensing circuit 1 at different positions may be used, which is not limited herein.
  • the projections of the infrared light source 2 and the photosensitive sensor circuit 1 in a direction perpendicular to the display panel are not overlapped with each other, and the infrared light emitted by the infrared light source 2 can be ensured. It is not directly received by the photosensitive sensor circuit 1 and thus does not affect the result of texture recognition or gesture recognition.
  • the display panel is generally divided into a display area A and a frame area B surrounding the display area A; the photosensitive sensing circuit 1 may be located in the display area A. ;
  • the display area A may further include: a plurality of pixel units 3 arranged in an array; at least part of the pixel units 3 include at least four sub-pixel areas 31, wherein one of the sub-pixel areas 31 is provided with one infrared emitting light source 2, and the remaining sub-pixel areas 31 are provided.
  • the infrared emitting light source 2 is disposed in the sub-pixel region 31, and the infrared emitting light source 2 can be prepared simultaneously with some of the sub-pixel structures R, B, and G, which can save the production process.
  • the sub-pixel structures R, B, and G are organic electroluminescent devices (OLEDs) on the substrate substrate 4
  • the infrared light source 2 includes an infrared electroluminescent film layer, which can be Organic electroluminescent devices have a common cathode layer or the like.
  • the projection of the photosensitive sensing circuit 1 in a direction perpendicular to the display panel is located at a gap between the sub-pixel regions 31.
  • the photosensitive sensing circuit 1 is disposed at a gap between the sub-pixel regions 31, and the projection of the infrared emitting light source 2 and the photosensitive sensing circuit 1 disposed in the sub-pixel region 31 in a direction perpendicular to the display panel can be ensured. Do not overlap each other; and, it can also ensure that the photosensitive sensing circuit 1 does not affect the use The normal operation of the displayed sub-pixel structures R, B and G.
  • the sub-pixel structures R, B, and G may be organic electroluminescent devices (OLEDs) on the substrate substrate 4;
  • OLEDs organic electroluminescent devices
  • the side of the electroluminescent device facing away from the substrate 4 is generally provided with a protective cover 5;
  • the photosensitive sensing circuit 1 may be located on a surface of the protective cover 5 facing the organic electroluminescent device.
  • the photosensitive sensing circuit 1 is formed on the protective cover 5, so that the photosensitive sensing circuit 1 and the organic electroluminescent device (OLED) are relatively far apart, so that signal interference between the two can be reduced.
  • OLED organic electroluminescent device
  • the sub-pixel structures R, B, and G may be organic electroluminescent devices located on the substrate 4; in each sub-pixel region. Between 31 is generally provided with a pixel definition layer 32;
  • the photosensitive sensing circuit 1 can be located between the pixel defining layer 32 and the substrate substrate 4.
  • a driving circuit of the organic electroluminescent device is generally disposed between the pixel defining layer 32 and the base substrate 4. Therefore, the photosensitive sensing circuit 1 and the driving circuit can be simultaneously fabricated, which can save the production process.
  • the display panel may further be a liquid crystal display panel, specifically including opposite opposing substrates 6 and array substrates 7; 6 facing the array substrate 7 is generally provided with a black matrix 8;
  • the photosensitive sensing circuit 1 can be located on the surface of the black matrix 8 facing away from the counter substrate 6.
  • the photosensitive sensing circuit 1 is not viewed from the display surface of the display panel, and thus the display is not affected. Moreover, the distance between the photosensitive signal circuit 1 disposed on the opposite substrate 6 and the display signal line in the array substrate 7 is relatively long, and signal interference between the two can be reduced.
  • the display panel may be a liquid crystal display panel, specifically including opposite opposing substrates 6 and array substrate 7;
  • the photosensitive sensing circuit 1 can also be located on the side of the array substrate 7 facing the opposite substrate 6.
  • a display driving circuit is generally disposed on the array substrate 7, and therefore, the same When the photosensitive sensing circuit 1 and the display driving circuit are fabricated, the production process can be saved.
  • a color filter 9 is generally disposed on a side of the opposite substrate 6 facing the array substrate 7;
  • the infrared emitting light source 2 includes an infrared photoluminescent film layer, and the infrared photoluminescent film layer and the color filter 9 are located on the same film layer.
  • the display panel is divided into a display area A and a frame area B surrounding the display area A; the infrared emission light source 2 may also be located in the frame area B, so that the display area is not affected. Display resolution in A.
  • an embodiment of the present disclosure further provides a display device, including the above display panel provided by the embodiment of the present disclosure.
  • the display device can be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, and the like.
  • Other indispensable components of the display device are understood by those skilled in the art, and are not described herein, nor should they be construed as limiting the disclosure.
  • the front camera may be further included.
  • the front camera can take a picture to accurately calculate the x, y coordinates of the gesture gesture, and the z coordinate obtained by the photosensitive sensing circuit 1 can determine the stereo coordinates of the gesture, thereby implementing gesture recognition.
  • an embodiment of the present disclosure further provides a driving method of the above display device, including:
  • At least an offset voltage is applied to each of the driving signal lines included in the required detection area, and the bias voltage is greater than an avalanche voltage of the photodiode;
  • At least the scanning signal lines included in the required detection area are scanned line by line, and at least the output signals of the respective read signal lines included in the required detection area are acquired.
  • the conduction state of the connected switching transistor is controlled by the scanning signal line, and when the switching transistor is turned on, the photodiode is loaded with an offset larger than the avalanche voltage by using the driving signal line.
  • Voltage. Infrared reflection of the ridge when performing texture recognition Light causes a reverse breakdown of the photodiode to generate a large current, which is output to the read signal line through the sampling resistor, and the current output from the photodiode corresponding to the valley is zero, thereby distinguishing the valley ridge.
  • the photodiode reverses the breakdown to generate a large current when receiving the illumination
  • the driving method provided by the embodiment of the present disclosure performs the texture recognition
  • the difference between the detection signals between the valleys is large, thereby It can reduce the difficulty of IC detection circuit detection and improve the detection accuracy of texture recognition.
  • the foregoing driving method may be performed only on a required detection area, which may save driving power consumption.
  • the offset voltage may be simultaneously applied to all the driving signal lines; the scanning signal lines are progressively scanned, and the output signals of the respective read signal lines are acquired. . This reduces the amount of instantaneous calculations while reducing the burden on panel traces and ICs.
  • the method when performing the hovering touch detection, that is, the gesture recognition, the method further includes: acquiring the gesture image by using the front camera, and determining the coordinate position of the gesture plane.
  • the front camera can take a picture to accurately calculate the x, y coordinates of the gesture gesture, and the z coordinate obtained by the photosensitive sensing circuit 1 can determine the stereo coordinates of the gesture, thereby implementing gesture recognition.
  • the method further includes: determining a required detection area according to the determined gesture plane coordinate position. That is, when performing hovering touch detection, that is, gesture recognition, the line determines the position of the gesture plane by the front camera, and after determining the required detection area, the above driving method can be performed only for the required detection area.
  • the display panel, the display device and the driving method thereof are provided by the embodiment of the present disclosure, and the conduction state of the connected switching transistor is controlled by the scanning signal line, and when the switching transistor is turned on, the photodiode is loaded with a larger avalanche voltage by using the driving signal line. Bias voltage.
  • the texture recognition is performed, the infrared light reflected by the ridge causes a reverse breakdown of the photodiode to generate a large current, which is output to the read signal line through the sampling resistor, and the current output from the photodiode corresponding to the valley is zero, thereby distinguishing the valley ridge.
  • the photodiode reverses the breakdown to generate a large current when receiving the illumination, in the case of the texture recognition provided by the embodiment of the present disclosure, the difference between the detection signals between the valleys is greater. Large, which can reduce the difficulty of detection circuit detection and improve the detection accuracy of texture recognition.

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  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
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  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种显示面板、显示装置及其驱动方法，通过扫描信号线控制连接的开关晶体管(12)的导通状态，在开关晶体管(12)导通时，利用驱动信号线对光敏二极管(11)加载大于雪崩电压的偏置电压。当进行纹路识别时，脊反射的红外光使光敏二极管(11)发生反向击穿产生大电流，通过采样电阻(13)输出至读取信号线，而对应谷的光敏二极管(11)输出的电流为零，从而分辨出谷脊。由于当光敏二极管(11)在接收到光照时会反向击穿产生较大的电流，因此，在进行纹路识别的情况下，谷脊之间的检测信号存在的差异较大，从而可以降低检测电路检测的难度，提高纹路识别的检测精度。

Description

一种显示面板、显示装置及其驱动方法
本公开要求在2017年3月28日提交中国专利局、申请号为201710193999.X、发明名称为“一种显示面板及显示设备”的中国专利申请的优先权，其全部内容通过引用结合在本公开中。
技术领域
本公开涉及显示技术领域，尤其涉及一种显示面板、显示装置及其驱动方法。
背景技术
目前集成于显示面板中的指纹识别器件有电容式、超声波式，各有优缺点，但有个共同的缺陷是传感器感应距离短，该缺陷严重限制了指纹识别器件的结构和性能，影响了其在移动终端产品中的广泛应用。
光学式指纹识别由于使用光学方式，天然具有长距离可感应的优势，但由于光学传感器(Photo Sensor)的高分辨率要求，只能将Sensor做得很小，又因为信号量通常与Sensor的面积成正比，那么其信号量也会变得相当微弱。
由于电流信号微弱，会增大检测芯片(IC)的检测难度，因此，需要检测电路进行放大积分降噪等处理，这会增大IC的制作成本。
发明内容
本公开实施例提供了一种显示面板，包括：多个呈阵列排布的光敏传感电路，与各行所述光敏传感电路对应的多条扫描信号线，以及与各列所述光敏传感电路对应的多条读取信号线和多条驱动信号线；各所述光敏传感电路包括：光敏二极管、开关晶体管和采样电阻；其中，
所述开关晶体管的栅极与对应的所述扫描信号线相连，所述开关晶体管的源极与所述光敏二极管的负极相连，所述开关晶体管的漏极与对应的所述 驱动信号线相连；
所述光敏二极管的正极与所述采样电阻的第一端相连，所述采样电阻的第二端接地；
所述采样电阻的第一端与对应的所述读取信号线相连。
在本公开实施例提供的上述显示面板中，还包括：至少一个红外发射光源；所述光敏二极管为红外光敏二极管；
所述红外发射光源与所述光敏传感电路在垂直于所述显示面板方向上的投影互不重叠。
在本公开实施例提供的上述显示面板中，所述显示面板分为显示区域和包围所述显示区域的边框区域；所述光敏传感电路位于所述显示区域；
所述显示区域还包括：呈阵列排布的多个像素单元；至少部分所述像素单元包括至少四个子像素区域，其中一个所述子像素区域设置一个所述红外发射光源，剩余的所述子像素区域设置用于显示的子像素结构。
在本公开实施例提供的上述显示面板中，所述光敏传感电路在垂直于所述显示面板方向上的投影位于所述子像素区域之间的间隙处。
在本公开实施例提供的上述显示面板中，所述子像素结构为位于衬底基板上的有机电致发光器件；在所述有机电致发光器件背离所述衬底基板的一侧设置有保护盖板；
所述光敏传感电路位于所述保护盖板面向所述有机电致发光器件的表面。
在本公开实施例提供的上述显示面板中，所述子像素结构为位于衬底基板上的有机电致发光器件；在各所述子像素区域之间设置有像素定义层；
所述光敏传感电路位于所述像素定义层与所述衬底基板之间。
在本公开实施例提供的上述显示面板中，所述显示面板为液晶显示面板，包括相对而置的对向基板和阵列基板；在所述对向基板面向所述阵列基板的一侧设置有黑矩阵；
所述光敏传感电路位于所述黑矩阵背离所述对向基板的表面。
在本公开实施例提供的上述显示面板中，所述显示面板为液晶显示面板，包括相对而置的对向基板和阵列基板；
所述光敏传感电路位于所述阵列基板面向所述对向基板的一侧。
在本公开实施例提供的上述显示面板中，在所述对向基板面向所述阵列基板的一侧设置有彩色滤光片；
所述红外发射光源包括红外光致发光膜层，所述红外光致发光膜层与所述彩色滤光片位于同一膜层。
在本公开实施例提供的上述显示面板中，所述显示面板分为显示区域和包围所述显示区域的边框区域；所述红外发射光源位于所述边框区域。
本公开实施例还提供了一种显示装置，包括本公开实施例提供的上述显示面板。
在本公开实施例提供的上述显示装置中，还包括：前置摄像头。
本公开实施例还提供了一种上述显示装置的驱动方法，包括：
至少对所需检测区域包含的各驱动信号线加载偏移电压，所述偏置电压大于所述光敏二极管的雪崩电压；
至少对所需检测区域包含的各扫描信号线进行逐行扫描，并至少获取所需检测区域包含的各读取信号线的输出信号。
在本公开实施例提供的上述驱动方法中，对全部所述驱动信号线加载所述偏移电压；
对各所述扫描信号线进行逐行扫描，并获取各所述读取信号线的输出信号。
在本公开实施例提供的上述驱动方法中，在进行悬浮触控检测时，还包括：
采用前置摄像头获取手势图像，确定手势平面坐标位置。
在本公开实施例提供的上述驱动方法中，还包括：
根据确定出的手势平面坐标位置，确定所述所需检测区域。
附图说明
图1为现有技术中的指纹检测结构的结构示意图；
图2为本公开实施例提供的显示面板的电路示意图；
图3为图2对应的信号时序图；
图4为本公开实施例提供的显示面板的俯视结构示意图；
图5至图8分别为本公开实施例提供的显示面板的侧视结构示意图。
具体实施方式
目前，基于光学传感器(Photo Sensor)的指纹检测结构，如图1所示，每个指纹检测单元由一个光敏二极管D1和一个开关晶体管T1组成。在进行指纹扫描时，由于指纹谷脊间的差异，光源照射到手指上的会产生不同的反射，从而使得到达光敏二极管D1处的光强出现变化，产生不同的光电流差异，在与光敏二极管D1连接的开关晶体管T1的控制下，依次读取出各个光敏二极管D1的电流差异，即可实现对指纹谷脊的检测。
但此种设计的缺陷在于，谷脊产生的电流差异很小，在小光强下，读取线Sline流过的电流很小，容易受到其他杂散电容充放电，以及其他行的扫描线Gate的开关漏电流的影响，噪声较大；并且，由于电流较小，检测芯片(IC)前端放大倍数需要较大，高放大倍数要求精度较高的大电阻；前端放大器偏执电流要求较低，而大偏执电流会消耗信号电流，甚至无法检测到电流。这两点都会极大地提高IC的制作成本以及IC的体积，导致降低量产的可能性。
针对现有技术中存在的光学传感器电流信号微弱不易检测的问题，本发明实施例提供了一种显示面板、显示装置及其驱动方法。为了使本发明的目的，技术方案和优点更加清楚，下面结合附图，对本发明实施例提供的显示面板、显示装置及其驱动方法的具体实施方式进行详细地说明。应当理解，下面所描述的优选实施例仅用于说明和解释本发明，并不用于限定本发明。并且在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
附图中各部件的形状和大小不反应真实比例，目的只是示意说明本发明内容。
具体地，本公开实施例提供了一种显示面板，如图2所示，包括：多个呈阵列排布的光敏传感电路1，与各行光敏传感电路1对应的多条扫描信号线Gate，以及与各列光敏传感电路2对应的多条读取信号线Vout和多条驱动信号线Drive line；各光敏传感电路1包括：光敏二极管11、开关晶体管12和采样电阻13；其中，
开关晶体管12的栅极与对应的扫描信号线Gate相连，开关晶体管12的源极与光敏二极管11的负极相连，开关晶体管12的漏极与对应的驱动信号线Drive line相连；
光敏二极管11的正极与采样电阻13的第一端相连，采样电阻13的第二端接地；
采样电阻13的第一端与对应的读取信号线Vout相连。
具体地，在本公开实施例提供的上述显示面板中，结合图3所示的时序图，通过扫描信号线Gate控制连接的开关晶体管12的导通状态，在开关晶体管12导通时，利用驱动信号线Drive line对光敏二极管11加载大于雪崩电压的偏置电压。当进行纹路识别时，脊反射的红外光使光敏二极管11发生反向击穿产生大电流，通过采样电阻13输出至读取信号线Vout，而对应谷的光敏二极管11输出的电流为零，从而分辨出谷脊。由于当光敏二极管11在接收到光照时会反向击穿产生较大的电流，因此，在本公开实施例提供的进行纹路识别的情况下，谷脊之间的检测信号存在的差异较大，从而可以降低IC检测电路检测的难度，提高纹路识别的检测精度。
可选地，在本公开实施例提供的上述显示面板中，如图4至图7所示，还可以包括：至少一个红外发射光源2；光敏二极管11为红外光敏二极管；
红外发射光源2与光敏传感电路1在垂直于显示面板方向上的投影互不重叠。
具体地，在本公开实施例提供的上述显示面板中设置红外发射光源2时， 光敏传感电路1还可以实现手势识别的功能。当进行手势识别时，由于手距离显示面板有一定的距离，光敏传感电路1无法检测到谷脊的差异，光敏二极管11仅是对手部的反射光产生对应的输出信号，通过检测不同位置反射光的收发时间差，可以计算出手势各部位的纵向坐标即z坐标。之后，搭配前置摄像头拍摄的图片计算获得的x，y坐标，可以确定手势的立体坐标，从而实现手势识别。当然，也可以不采用前置摄像头，而是利用不同位置处的光敏传感电路1输出的信号差异计算获得的x，y坐标，在此不做限定。
具体地，在本公开实施例提供的上述显示面板中，将红外发射光源2与光敏传感电路1在垂直于显示面板方向上的投影互不重叠设置，可以保证红外发射光源2发射的红外光不会直接被光敏传感电路1接收，从而不会影响纹路识别或手势识别的结果。
可选地，在本公开实施例提供的上述显示面板中，如图4所示，显示面板一般分为显示区域A和包围显示区域A的边框区域B；光敏传感电路1可以位于显示区域A；
显示区域A还可以包括：呈阵列排布的多个像素单元3；至少部分像素单元3包括至少四个子像素区域31，其中一个子像素区域31设置一个红外发射光源2，剩余的子像素区域31设置用于显示的子像素结构R、B和G。
具体地，将红外发射光源2设置于子像素区域31内，可以和子像素结构R、B和G的某些膜层同时制备出红外发射光源2，这样可以节省成产程序。例如图5和图6所示，在子像素结构R、B和G为位于衬底基板4上的有机电致发光器件(OLED)时，红外发射光源2包括红外电致发光膜层，可以和有机电致发光器件公用阴极层之类的膜层。
可选地，在本公开实施例提供的上述显示面板中，如图4所示，光敏传感电路1在垂直于显示面板方向上的投影位于子像素区域31之间的间隙处。
具体地，将光敏传感电路1设置于子像素区域31之间的间隙处，可以保证设置于子像素区域31内的红外发射光源2与光敏传感电路1在垂直于显示面板方向上的投影互不重叠；并且，还可以保证光敏传感电路1不会影响用 于显示的子像素结构R、B和G的正常工作。
可选地，在本公开实施例提供的上述显示面板中，如图5所示，子像素结构R、B和G可以为位于衬底基板4上的有机电致发光器件(OLED)；在有机电致发光器件背离衬底基板4的一侧一般设置有保护盖板5；
光敏传感电路1可以位于保护盖板5面向有机电致发光器件的表面。
具体地，在保护盖板5上形成光敏传感电路1，可以使光敏传感电路1与有机电致发光器件(OLED)距离相对较远，从而可以降低两者之间的信号干扰。
可选地，在本公开实施例提供的上述显示面板中，如图6所示，子像素结构R、B和G可以为位于衬底基板4上的有机电致发光器件；在各子像素区域31之间一般设置有像素定义层32；
光敏传感电路1可以位于像素定义层32与衬底基板4之间。
具体地，一般在像素定义层32与衬底基板4之间还会设置有有机电致发光器件的驱动电路，因此，可以同时制作光敏传感电路1和驱动电路，这样可以节省成产程序。
可选地，在本公开实施例提供的上述显示面板中，如图7所示，显示面板还可以为液晶显示面板，具体包括相对而置的对向基板6和阵列基板7；在对向基板6面向阵列基板7的一侧一般设置有黑矩阵8；
光敏传感电路1可以位于黑矩阵8背离对向基板6的表面。
具体地，通过黑矩阵8的遮挡，从显示面板的显示面不会观看到光敏传感电路1，因此不会对显示造成影响。并且，设置在对向基板6的光敏传感电路1与阵列基板7中的显示用信号线距离较远，可以降低两者之间的信号干扰。
可选地，在本公开实施例提供的上述显示面板中，如图8所示，显示面板可以为液晶显示面板，具体包括相对而置的对向基板6和阵列基板7；
光敏传感电路1还可以位于阵列基板7面向对向基板6的一侧。
具体地，一般在阵列基板7上一般设置有显示驱动电路，因此，可以同 时制作光敏传感电路1和显示驱动电路，这样可以节省成产程序。
可选地，在本公开实施例提供的上述显示面板中，如图7和图8所示，在对向基板6面向阵列基板7的一侧一般还会设置有彩色滤光片9；
红外发射光源2包括红外光致发光膜层，红外光致发光膜层与彩色滤光片9位于同一膜层。
可选地，在本公开实施例提供的上述显示面板中，显示面板分为显示区域A和包围显示区域A的边框区域B；红外发射光源2还可以位于边框区域B，这样不会影响显示区域A内的显示分辨率。
基于同一发明构思，本公开实施例还提供了一种显示装置，包括本公开实施例提供的上述显示面板。该显示装置可以为：手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。对于该显示装置的其它必不可少的组成部分均为本领域的普通技术人员应该理解具有的，在此不做赘述，也不应作为对本公开的限制。该显示装置的实施可以参见上述显示面板的实施例，重复之处不再赘述。
可选地，在本公开实施例提供的上述显示装置中，还可以包括：前置摄像头。前置摄像头可以拍摄图片精确地计算获得手势姿势的x，y坐标，和光敏传感电路1获得的z坐标结合，可以确定手势的立体坐标，从而实现手势识别。
基于同一发明构思，本公开实施例还提供了一种上述显示装置的驱动方法，包括：
至少对所需检测区域包含的各驱动信号线加载偏移电压，偏置电压大于光敏二极管的雪崩电压；
至少对所需检测区域包含的各扫描信号线进行逐行扫描，并至少获取所需检测区域包含的各读取信号线的输出信号。
具体地，在本公开实施例提供的上述驱动方法中，通过扫描信号线控制连接的开关晶体管的导通状态，在开关晶体管导通时，利用驱动信号线对光敏二极管加载大于雪崩电压的偏置电压。当进行纹路识别时，脊反射的红外 光使光敏二极管发生反向击穿产生大电流，通过采样电阻输出至读取信号线，而对应谷的光敏二极管输出的电流为零，从而分辨出谷脊。由于当光敏二极管在接收到光照时会反向击穿产生较大的电流，因此，在本公开实施例提供的驱动方法进行纹路识别时，谷脊之间的检测信号存在的差异较大，从而可以降低IC检测电路检测的难度，提高纹路识别的检测精度。
可选地，在本公开实施例提供的上述驱动方法中，可以仅对所需检测区域执行上述驱动方法，这样可以节省驱动功耗。
或者，可选地，在本公开实施例提供的上述驱动方法中，可以对全部驱动信号线同时加载偏移电压；对各扫描信号线进行逐行扫描，并获取各读取信号线的输出信号。这样可以减少瞬时计算量，同时可以减少面板走线和IC的负担。
可选地，在本公开实施例提供的上述驱动方法中，在进行悬浮触控检测即手势识别时，还可以包括：采用前置摄像头获取手势图像，确定手势平面坐标位置。前置摄像头可以拍摄图片精确地计算获得手势姿势的x，y坐标，和光敏传感电路1获得的z坐标结合，可以确定手势的立体坐标，从而实现手势识别。
可选地，在本公开实施例提供的上述驱动方法中，还可以包括：根据确定出的手势平面坐标位置，确定所需检测区域。即，在进行悬浮触控检测即手势识别时，线通过前置摄像头确定手势平面坐标位置，在确定所需检测区域后，可以仅对所需检测区域执行上述驱动方法。
本公开实施例提供的上述显示面板、显示装置及其驱动方法，通过扫描信号线控制连接的开关晶体管的导通状态，在开关晶体管导通时，利用驱动信号线对光敏二极管加载大于雪崩电压的偏置电压。当进行纹路识别时，脊反射的红外光使光敏二极管发生反向击穿产生大电流，通过采样电阻输出至读取信号线，而对应谷的光敏二极管输出的电流为零，从而分辨出谷脊。由于当光敏二极管在接收到光照时会反向击穿产生较大的电流，因此，在本公开实施例提供的进行纹路识别的情况下，谷脊之间的检测信号存在的差异较 大，从而可以降低检测电路检测的难度，提高纹路识别的检测精度。
显然，本领域的技术人员可以对本公开实施例进行各种改动和变型而不脱离本公开实施例的精神和范围。这样，倘若本公开实施例的这些修改和变型属于本公开权利要求及其等同技术的范围之内，则本公开也意图包含这些改动和变型在内。

Claims (16)

  1. 一种显示面板，其特征在于，包括：多个呈阵列排布的光敏传感电路，与各行所述光敏传感电路对应的多条扫描信号线，以及与各列所述光敏传感电路对应的多条读取信号线和多条驱动信号线；各所述光敏传感电路包括：光敏二极管、开关晶体管和采样电阻；其中，
    所述开关晶体管的栅极与对应的所述扫描信号线相连，所述开关晶体管的源极与所述光敏二极管的负极相连，所述开关晶体管的漏极与对应的所述驱动信号线相连；
    所述光敏二极管的正极与所述采样电阻的第一端相连，所述采样电阻的第二端接地；
    所述采样电阻的第一端与对应的所述读取信号线相连。
  2. 如权利要求1所述的显示面板，其特征在于，还包括：至少一个红外发射光源；所述光敏二极管为红外光敏二极管；
    所述红外发射光源与所述光敏传感电路在垂直于所述显示面板方向上的投影互不重叠。
  3. 如权利要求2所述的显示面板，其特征在于，所述显示面板分为显示区域和包围所述显示区域的边框区域；所述光敏传感电路位于所述显示区域；
    所述显示区域还包括：呈阵列排布的多个像素单元；至少部分所述像素单元包括至少四个子像素区域，其中一个所述子像素区域设置一个所述红外发射光源，剩余的所述子像素区域设置用于显示的子像素结构。
  4. 如权利要求3所述的显示面板，其特征在于，所述光敏传感电路在垂直于所述显示面板方向上的投影位于所述子像素区域之间的间隙处。
  5. 如权利要求4所述的显示面板，其特征在于，所述子像素结构为位于衬底基板上的有机电致发光器件；在所述有机电致发光器件背离所述衬底基板的一侧设置有保护盖板；
    所述光敏传感电路位于所述保护盖板面向所述有机电致发光器件的表 面。
  6. 如权利要求4所述的显示面板，其特征在于，所述子像素结构为位于衬底基板上的有机电致发光器件；在各所述子像素区域之间设置有像素定义层；
    所述光敏传感电路位于所述像素定义层与所述衬底基板之间。
  7. 如权利要求4所述的显示面板，其特征在于，所述显示面板为液晶显示面板，包括相对而置的对向基板和阵列基板；在所述对向基板面向所述阵列基板的一侧设置有黑矩阵；
    所述光敏传感电路位于所述黑矩阵背离所述对向基板的表面。
  8. 如权利要求4所述的显示面板，其特征在于，所述显示面板为液晶显示面板，包括相对而置的对向基板和阵列基板；
    所述光敏传感电路位于所述阵列基板面向所述对向基板的一侧。
  9. 如权利要求7或8所述的显示面板，其特征在于，在所述对向基板面向所述阵列基板的一侧设置有彩色滤光片；
    所述红外发射光源包括红外光致发光膜层，所述红外光致发光膜层与所述彩色滤光片位于同一膜层。
  10. 如权利要求2所述的显示面板，其特征在于，所述显示面板分为显示区域和包围所述显示区域的边框区域；所述红外发射光源位于所述边框区域。
  11. 一种显示装置，其特征在于，包括权利要求1～10任一项所述的显示面板。
  12. 如权利要求11所述的显示装置，其特征在于，还包括：前置摄像头。
  13. 一种如权利要求11或12所述的显示装置的驱动方法，其特征在于，包括：
    至少对所需检测区域包含的各驱动信号线加载偏移电压，所述偏置电压大于所述光敏二极管的雪崩电压；
    至少对所需检测区域包含的各扫描信号线进行逐行扫描，并至少获取所 需检测区域包含的各读取信号线的输出信号。
  14. 如权利要求13所述的驱动方法，其特征在于，对全部所述驱动信号线加载所述偏移电压；
    对各所述扫描信号线进行逐行扫描，并获取各所述读取信号线的输出信号。
  15. 如权利要求13所述的驱动方法，其特征在于，在进行悬浮触控检测时，还包括：
    采用前置摄像头获取手势图像，确定手势平面坐标位置。
  16. 如权利要求15所述的驱动方法，其特征在于，还包括：
    根据确定出的手势平面坐标位置，确定所述所需检测区域。
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