CN113867023A - Fingerprint display apparatus and integrated circuit and method for driving the same - Google Patents
Fingerprint display apparatus and integrated circuit and method for driving the same Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—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
- G02F1/136286—Wiring, e.g. gate line, drain line
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Abstract
A fingerprint display device is provided with a plurality of pixel rows, each pixel row of n pixel rows in the plurality of pixel rows is provided with a plurality of display pixel units and a plurality of fingerprint pixel units, n is an integer larger than 1, the n pixel rows are at least driven by corresponding n display scanning lines to carry out display and fingerprint sensing, each fingerprint pixel unit is provided with a reset end and a selection end, the reset end of the fingerprint pixel unit of the ith pixel row in the n pixel rows is connected to the ith display scanning line in the n display scanning lines, the selection end of the fingerprint pixel unit of the ith pixel row in the n pixel rows is connected to the (i-1) th display scanning line in the n display scanning lines, and i is any integer between 1 and n.
Description
Technical Field
The present invention relates to a fingerprint display device, and more particularly, to a fingerprint display device integrating an optical fingerprint sensor and a flat display panel, and an integrated circuit and a method for driving the same.
Background
FIG. 1 is a schematic diagram illustrating an integrated optical fingerprint sensor and liquid crystal display (LCD display) panel. The fingerprint sensor (fingerprint sensor)11 is, for example, disposed between the thin film transistor layer 12 and the filter substrate layer 13 of the liquid crystal display panel structure, so that light from the backlight source of the reflection layer 14 can be reflected to the fingerprint sensor 11 after encountering a finger on the glass substrate 15, and because the reflectivity of the peak and the trough of the fingerprint is different, a fingerprint image can be reconstructed according to the sensing amount of the fingerprint sensor 11.
In order to drive the fingerprint sensor for fingerprint identification on the display panel, a reset line (RST) and a select line (SEL) are usually additionally disposed to control the operation of the fingerprint sensor 11, but since the optical fingerprint sensor 11 is embedded in the pixels of the lcd panel, the additional reset line and select line will cause the aperture ratio of the lcd panel to be greatly reduced, resulting in the reduction of the display brightness.
Therefore, there are still many defects in the design of the existing fingerprint display device and the need for improvement.
Disclosure of Invention
The present invention is directed to a fingerprint display device and an integrated circuit and method for driving the same, in which a display scan line, a reset line and a select line are integrated into one by merging the reset line and the select line into the display scan line, so as to effectively improve a panel aperture ratio.
According to an aspect of the present invention, a fingerprint display device is provided, which has a plurality of pixel rows, each of n pixel rows of the plurality of pixel rows has a plurality of display pixel units and a plurality of fingerprint pixel units, n is an integer greater than 1, the n pixel rows are at least driven by corresponding n display scan lines for display and fingerprint sensing, wherein each fingerprint pixel unit has a reset end and a selection end, the reset end of the fingerprint pixel unit of the ith pixel row of the n pixel rows is connected to the ith display scan line of the n display scan lines, the selection end of the fingerprint pixel unit of the ith pixel row of the n pixel rows is connected to the (i-1) th display scan line of the n display scan lines, and i is any integer between 1 and n.
According to another aspect of the present invention, a driving method of a fingerprint display device is provided, the fingerprint display device having a plurality of pixel rows, each of n pixel rows of the plurality of pixel rows having a plurality of display pixel units and a plurality of fingerprint pixel units, n being an integer greater than 1, the n pixel rows being driven by at least n corresponding display scan lines for display and fingerprint sensing, each fingerprint pixel unit having a reset terminal and a selection terminal, the method comprising: and sequentially driving the n display scanning lines, wherein when driving the (i-1) th display scanning line in the n display scanning lines, a selection end of the fingerprint pixel units of the ith pixel row in the n pixel rows is started, and when driving the ith display scanning line in the n display scanning lines, a reset end of the fingerprint pixel units of the ith pixel row in the n pixel rows is started, wherein i is any integer between 1 and n.
According to another aspect of the present invention, an integrated circuit is provided for controlling the fingerprint display device to sequentially drive the display scan lines for displaying and fingerprint sensing.
The foregoing summary, as well as the following detailed description, is exemplary in nature and is intended to further illustrate the present invention as claimed, and other objects and advantages of the invention will be apparent from the following description and drawings.
Drawings
FIG. 1 shows a schematic diagram of an integrated optical fingerprint sensor and LCD panel.
FIG. 2A shows a circuit diagram of an optical fingerprint pixel unit.
FIG. 2B shows a circuit diagram of another optical fingerprint pixel cell.
Fig. 3 shows a system architecture diagram of the fingerprint display device of the present invention.
Fig. 4 schematically shows rows of pixels of i-1, i +1, etc. in the fingerprint display device of the present invention.
FIG. 5A shows a circuit diagram of a fingerprint pixel unit of the ith pixel row according to an embodiment of the present invention.
FIG. 5B shows another circuit diagram of the fingerprint pixel cells of the ith pixel row according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of the fingerprint pixel cell of FIG. 5A integrated into a display pixel cell according to the present invention.
Fig. 7 is a timing diagram showing display scan lines of the fingerprint display device of the present invention.
Fig. 8 shows an embodiment of a GOA circuit for implementing display driving and fingerprint sensing of the fingerprint display device of the present invention.
FIG. 9 is a timing diagram illustrating an operation of the fingerprint display apparatus according to the present invention.
Fig. 10 shows another embodiment of a GOA circuit for implementing display driving and fingerprint sensing of the fingerprint display device of the present invention.
FIG. 11A shows a circuit diagram of a fingerprint pixel cell of the ith pixel row according to another embodiment of the present invention.
FIG. 11B shows another circuit diagram of the fingerprint pixel unit of the ith pixel row according to another embodiment of the present invention.
FIG. 12 is a schematic diagram of the fingerprint pixel cell of FIG. 11A integrated into a display pixel cell according to the present invention.
Fig. 13 is a circuit diagram of the reset switch control trace of the present invention in the display area and the periphery of the panel.
The reset transistor T1 drives the transistor T2
Selection transistor T3 load transistor T4
PS capacitor C of optical sensing component
Display driving and fingerprint sensing integrated circuit 39 of GOA circuit 33
Switch SW reset line RST
Reset RST' select line SEL
The select terminal SEL' reads out the line RO
Read-out terminal RO ', RO' display scanning line G-disp
Reset switch control line G-RST control end G
Connecting the first end e1 and the second end e2 of the end D, S
Voltages VDD1, VDD2, VB, VSS, SVSS, SVDD, Vbias
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific examples described herein are merely illustrative of the embodiments of the invention and are not intended to limit the invention.
Fig. 2A shows a circuit diagram of an optical fingerprint pixel unit 21, which is a three-transistor (3T) fingerprint pixel circuit, the fingerprint pixel unit 21 is implemented by a reset transistor T1, a driving transistor T2, a selection transistor T3, an optical sensor element (photo sensor) PS, and a capacitor C, and an array of a plurality of fingerprint pixel units 21 constitutes a fingerprint sensor, wherein, in the array of the plurality of fingerprint pixel units, the fingerprint pixel units 21 in the same row (column) share a load transistor T4, such as the load transistor T4 connected to the fingerprint pixel unit 21 shown in fig. 2. In addition, the transistors T1 through T4 shown in fig. 2 are NMOS transistors, but this is by way of example and not limitation, and it is understood that the transistors T1 through T4 may be other types of MOS transistors, such as PMOS transistors. Each of the transistors T1-T4 has a control terminal and two connection terminals, i.e., a gate (G) and a drain (D) and a source (S), respectively, for the MOS transistor. In addition, the reset transistor T1 may alternatively be formed by a dual gate (dual gate), and the reset transistor T1, the driving transistor T2 or the selecting transistor T3 is not limited to a single transistor, and may be formed by connecting two transistors with their control terminals connected together in series.
In the optical fingerprint pixel unit 21 of fig. 2A, the control terminal (G) of the reset transistor T1 is connected to the reset line RST, and the two connection terminals (D, S) are respectively connected to the first voltage VDD1 and the optical sensing element PS. The control terminal (G) of the driving transistor T2 is connected to the connection terminal (S) of the reset transistor T1 and the optical sensing element PS, and the connection terminals (D, S) thereof are respectively connected to the connection terminal (D) of the selection transistor T3 and the second voltage VDD2, wherein the first voltage VDD1 and the second voltage VDD2 can be the same DC voltage source or different DC voltage sources. The control terminal (G) of the selection transistor T3 is connected to a selection line SEL, and both connection terminals (D, S) thereof are connected to the connection terminal (S) of the driving transistor T2 and the readout line RO, respectively. The two ends of the capacitor C are respectively connected to the control end (G) of the driving transistor T2 and the bias voltage Vbias. The two ends of the photo sensor element PS are connected to the connection terminal (S) of the reset transistor T1 and the bias voltage Vbias, respectively, and the capacitor C may be a capacitor structure formed by the self-component inside the photo sensor element PS, or an additionally configured capacitor, or a combination of the two. The control terminal (G) of the load transistor T4 is connected to the fifth voltage VB, and the connection terminals (D, S) thereof are connected to the sense line RO and the sixth voltage VSS, respectively.
The operation of fingerprint sensing by the optical fingerprint pixel unit 21 of fig. 2A is as follows: first, the reset line RST is driven to turn on the reset transistor T1, so as to reset the node voltage of the capacitor C to a default value, i.e., the first voltage VDD 1; then, the reset transistor T1 is turned off to make the photo sensor PS continuously exposed for a period of time, and the discharge amount of the capacitor C is different according to the difference between the illumination intensity and the exposure time, so the terminal voltage of the capacitor C is also different; when the default exposure time is reached, the select line SEL is driven to turn on the select transistor T3, so that the drive transistor T2 outputs a current to the readout line RO, wherein the magnitude of the output current is related to the voltage at the terminal of the capacitor C connected to the control terminal (G) of the drive transistor T2, i.e. the illumination intensity and the exposure time, and the load transistor T4 connected to the readout line RO is equivalent to an active load (active load), so that the voltage at the readout terminal RO ″ of the readout line RO "is related to the resistances of the reset transistor T1 and the active load, and the illumination intensity can be determined by reading the voltage at the readout terminal RO ″ through the integrated circuit.
Fig. 2B shows another circuit diagram of an optical fingerprint pixel unit 21, which is a two-transistor (2T) fingerprint pixel circuit, the fingerprint pixel unit 21 is implemented by a reset transistor T1, a driving transistor T2, an optical sensor element (photo sensor) PS, and a capacitor C, and an array of a plurality of fingerprint pixel units 21 constitutes a fingerprint sensor, wherein, in the array of the plurality of fingerprint pixel units 21, the fingerprint pixel units 21 in the same row (column) share a load transistor T4, such as the load transistor T4 connected to the fingerprint pixel unit 21 shown in fig. 2B. In addition, the transistors T1, T2 and T4 shown in fig. 2B are NMOS transistors, but this is only by way of example and not limitation, and it is understood that the transistors T1, T2 and T4 can also be other types of MOS transistors, such as PMOS transistors. Each of the transistors T1, T2 and T4 has a control terminal and two connection terminals, i.e., a gate (G) and a drain (D) and a source (S) for MOS transistors. In addition, alternatively, the reset transistor T1 may be formed by a dual gate (dual gate), and the reset transistor T1 or the driving transistor T2 is not limited to a single transistor, and may be formed by two transistors whose control terminals are connected together in series.
In the optical fingerprint pixel unit 21 of fig. 2B, the control terminal (G) of the reset transistor T1 is connected to the reset line RST, and the two connection terminals (D, S) are respectively connected to the third voltage SVSS and the optical sensing element PS. The control terminal (G) of the driving transistor T2 is connected to the connection terminal (S) of the reset transistor T1 and the photo sensor element PS, and the connection terminals (D, S) thereof are respectively connected to the fourth voltage SVDD and the readout line RO. Two ends of the photo sensor element PS are respectively connected to the connection terminal (S) of the reset transistor T1, the control terminal (G) of the driving transistor T2, and the selection line (SEL). The two ends of the capacitor C are also connected to the connection terminal (S) of the reset transistor T1, the control terminal (G) of the driving transistor T2, and the selection line SEL, respectively, and the capacitor C may be a capacitor structure formed by the self-component inside the optical sensor element PS, or an additionally configured capacitor, or a combination of the two. The control terminal (G) of the load transistor T4 is connected to the fifth voltage VB, and the connection terminal (D) thereof is connected to the sense line RO.
The operation of fingerprint sensing performed by the optical fingerprint pixel unit 21 of fig. 2B is as follows: first, the reset line RST is driven to turn on the reset transistor T1, so as to reset the terminal voltage Vp of the capacitor C to a predetermined value, i.e., the third voltage SVSS, whereby the third voltage SVSS ensures that the driving transistor T2 is turned off; then, the reset transistor T1 is turned off to make the photo sensor PS continuously exposed for a period of time, and the discharge amount of the capacitor C is different according to the difference between the illumination intensity and the exposure time, so the terminal voltage Vp of the capacitor C is also different; when the default exposure time is reached, the selection line SEL is driven to switch the voltage of the selection line SEL from the low level to the high level (potential difference Δ V), and the terminal voltage Vp of the capacitor C is substantially increased by Δ V due to the coupling effect, so that the driving transistor T2 can be turned on to output a current to the readout line RO. The magnitude of the output current is related to the terminal voltage Vp of the capacitor C, i.e. the illumination intensity and the exposure time. The load transistor T4 connected to the sense line RO corresponds to an active load (active load). Therefore, the voltage of the readout terminal RO ″ of the readout line RO is related to the resistance of the reset transistor T1 and the active load, and the illumination intensity can be determined by reading the voltage of the readout terminal RO ″ of the readout line RO through the integrated circuit.
In order to avoid the problem of the large reduction of the aperture ratio of the display panel caused by the additional arrangement of the reset line RST and the select line SEL as shown in fig. 2A and 2B, in an embodiment of the fingerprint display apparatus of the present invention, the reset line RST and the select line SEL are merged into the display scan line, so that the additional reset line RST and the select line SEL are not required in an optical fingerprint pixel unit. Referring to fig. 3, a system architecture diagram of the fingerprint display device of the present invention is shown, wherein display driving (display gate) and fingerprint sensing (fingerprint sensing) goa (gate on array) circuits 33 are disposed on the left and right sides of a panel 31 for sequentially driving display scan lines G-disp for displaying according to the control of an integrated circuit 39. In addition, in order to realize the fingerprint detection function, the display driving and fingerprint sensing GOA circuit 33 also drives the display scan line G-disp to perform fingerprint sensing according to the control of the integrated circuit 39, and the sensed fingerprint data is read from the readout line RO to the integrated circuit 39 for fingerprint identification, specifically, in the actual circuit, the readout line RO can enter the integrated circuit 39 by multiplexing the same line with the data line via a multiplexer after extending out of the panel 31, so as to save the number of pins of the integrated circuit 39. In the present invention, the panel 31 can be any type of flat display panel, such as an LCD panel or an OLED panel. Although the display driving and fingerprint sensing GOA circuits 33 are shown to be disposed on the left and right sides of the panel 31 in this embodiment, the invention is not limited thereto, and in other embodiments, the display driving and fingerprint sensing GOA circuits 33 may also be disposed on one side of the panel 31. In addition, the panel 31 of the fingerprint display device of the present invention may also provide a touch sensing function, for example, by cutting the common electrode of the panel 31 to serve as a touch sensor (not shown), and the touch sensor senses the touch of the finger of the user and transmits a touch signal to the integrated circuit 39 for touch detection to implement the touch sensing function, wherein cutting the common electrode to serve as the touch sensor is known by those skilled in the art, and therefore, is not described herein again. That is, in one embodiment, the present invention provides an electronic device with three functions of fingerprint sensing, touch sensing and display, an integrated circuit for driving the electronic device, and a driving method thereof.
Fig. 3 shows that the fingerprint display device of the present invention has a plurality of pixel rows (row)37, n pixel rows 37 in the plurality of pixel rows 37 can provide the display and fingerprint identification functions, n is an integer greater than 1, that is, each pixel row 37 of the n pixel rows 37 has a plurality of display pixel units 41 and a plurality of fingerprint pixel units 21, and the n pixel rows 37 are driven by at least n display scan lines G-disp and n select lines SEL for display and fingerprint sensing. In an embodiment, the number of the display pixel units 41 in one pixel row 37 is the same as the number of the fingerprint pixel units 21, however, the invention is not limited thereto, and in other embodiments, the number of the fingerprint pixel units 21 in one pixel row 37 may be less than the number of the display pixel units 41, and in addition, the pixel rows 37 in the entire display area of the panel 31 may have both the display pixel units 41 and the fingerprint pixel units 21, or only a portion of the display area, for example, one third of the display area has the display pixel units 41 and the fingerprint pixel units 21, while the pixel rows 37 in the remaining display area have only the display pixel units 41.
Please refer to fig. 4 together to schematically show the i-1 th, i +1 th pixel rows of the n pixel rows 37 of the fingerprint display device, wherein the pixel row 37 has a display pixel unit 41 and a fingerprint pixel unit 21 as shown in fig. 2A or 2B, and it is shown that one display pixel unit 41 in one pixel row 37 corresponds to one fingerprint pixel unit 21, but this is merely for convenience of illustration and not limitation, the display pixel units 41 of the same pixel row 37 are connected to the display scan line G-disp corresponding to the pixel row 37, and the fingerprint pixel units 21 on the same pixel row 37 are connected to the display scan line G-disp corresponding to the pixel row 37 and the previous display scan line G-disp, accordingly, the n pixel rows 37 are driven by at least the corresponding n display scan lines G-disp for displaying and fingerprint sensing, wherein, each fingerprint pixel unit 21 has a reset terminal RST and a select terminal SEL ', the reset terminal RST ' of the fingerprint pixel unit 21 of the ith pixel row in the n pixel rows 37 is connected to the ith display scan line G-disp (i) in the n display scan lines G-disp, and the select terminal SEL ' of the fingerprint pixel unit 21 of the ith pixel row in the n pixel rows 37 is connected to the (i-1) th display scan line G-disp (i-1) in the n display scan lines G-disp, where i is any integer between 1 and n. Accordingly, the fingerprint display device of the present invention sequentially drives the display scan lines G-disp for display and fingerprint sensing.
Referring to fig. 5A, a circuit diagram of the fingerprint pixel unit 21 of the ith pixel row of the n pixel rows 37 is shown, wherein the reset transistor T1 has a control terminal (G), a first connection terminal (D) and a second connection terminal (S), the control terminal (G) is used as a reset terminal RST' and is connected to the ith display scan line G-disp (i) of the n display scan lines G-disp, and the first connection terminal (D) is connected to a first voltage VDD 1; the driving transistor T2 has a control terminal (G), a first connection terminal (D) and a second connection terminal (S), the control terminal (G) is connected to the second connection terminal (S) of the reset transistor T1, the first connection terminal (D) is connected to the second voltage VDD2, wherein the first voltage VDD1 and the second voltage VDD2 can be the same DC voltage source or different DC voltage sources; the selection transistor T3 has a control terminal (G) serving as a selection terminal SEL 'and connected to the i-1 th display scan line G-disp (i-1) of the n display scan lines G-disp, a first connection terminal (D) connected to the second connection terminal (S) of the driving transistor T2, and a second connection terminal (S) serving as a readout terminal RO' connected to the readout line RO; a Photo Sensor (PS) having two terminals respectively connected to the second connection terminal (S) of the reset transistor T1 and a bias voltage Vbias; the capacitor C has two ends respectively connected to the control end (G) of the driving transistor T2 and the bias voltage Vbias. In an embodiment, the capacitor C may be a capacitor structure formed by the self-component inside the optical sensing component PS, but not limited to this, and may be an additionally configured capacitor, or a combination of the two.
As shown in fig. 5A, the reset line RST and the select line SEL are merged into the display scan line, so that the display scan line, the reset line and the select line are integrated into one line, and thus a pixel row can be driven without the need for the reset line and the select line, thereby increasing the panel transmittance. And the display scanning lines G-disp (1), G-disp (2) … G-disp (i-1) and G-disp (i) … in the whole fingerprint sensing array are sequentially driven. When the display scanning line G-disp (i-1) is driven, the selection transistor T3 of the fingerprint pixel unit 21 of the ith row is turned on to read out the fingerprint signal. Then, the display scan line G-disp (i) is driven to turn on the reset transistor T1 to reset the level of the capacitor C, thereby achieving the fingerprint sensing effect.
Fig. 5B shows another circuit diagram of the fingerprint pixel unit 21 of the ith pixel row of the n pixel rows according to the embodiment of the present invention, wherein the reset transistor T1 has a control terminal (G), a first connection terminal (D) and a second connection terminal (S), the control terminal (G) is used as the reset terminal RST' and is connected to the ith display scan line G-disp (i) of the n display scan lines G-disp, and the first connection terminal (D) is connected to a third voltage SVSS; the driving transistor T2 has a control terminal (G) connected to the second connection terminal (S) of the reset transistor T1, a first connection terminal (D) connected to a fourth voltage SVDD, and a second connection terminal (S) serving as the readout terminal RO' and connected to the readout line RO; an optical sensor element (photo sensor) PS having a first terminal connected to the second connection terminal (S) of the reset transistor T1 and a second terminal serving as a selection terminal SEL' and connected to the i-1 th display scan line G-disp (i-1) of the n display scan lines G-disp; the capacitor C has two ends respectively connected to the control end (G) of the driving transistor T2 and the second end of the photo sensor element PS. In an embodiment, the capacitor C may be a capacitor structure formed by the self-component inside the optical sensing component PS, but not limited to this, and may be an additionally configured capacitor, or a combination of the two.
As shown in fig. 5B, the reset line RST and the select line SEL are merged into the display scan line, so that the display scan line, the reset line and the select line are integrated into one line, and thus a pixel row can be driven without the need for the reset line and the select line, thereby increasing the panel transmittance. And the display scanning lines G-disp (1), G-disp (2) … G-disp (i-1) and G-disp (i) … in the whole fingerprint sensing array are sequentially driven. When the display scan line G-disp (i-1) is driven, power is supplied to the optical sensing element PS of the fingerprint pixel unit 21 of the ith pixel row of the n pixel rows to increase the voltage level of the selection terminal SEL', so as to turn on the driving transistor T2 and read out the fingerprint signal. Then, the display scan line G-disp (i-1) is driven to turn on the reset transistor T1 of the fingerprint pixel unit 21 of the ith pixel row of the n pixel rows to reset the level of the capacitor C, thereby achieving the effect of fingerprint sensing.
Fig. 6 is a schematic diagram illustrating the integration of the fingerprint pixel unit 21 of fig. 5A into the display pixel unit 41 according to the present invention, which shows that the display pixel unit 41 including three RGB sub-pixels of the LCD integrates a fingerprint pixel unit 21, wherein the circuit area of the fingerprint pixel unit 21 is disposed in the right area of one sub-pixel, but this is by way of example and not limitation, and it is conceivable that the circuit area of the fingerprint pixel unit 21 may also be disposed in the lower area of the three RGB sub-pixels. In addition, the present invention is not limited to the LCD panel, and the present invention is also applicable to other types of panels such as OLED, or other pixel arrangements such as RGBW.
In the embodiment of FIG. 6, the LTPS LCD process is taken as an example, and the display scan line G-disp can be made of metal-1 (M1). The data lines 61 connecting the three RGB sub-pixels may be made of metal 2(metal-2, M2), denoted as R (M2), G (M2) and B (M2) in FIG. 6(A), and these data lines 61 function to transmit display data to each display sub-pixel. The gate of the tft TG1 of the green sub-pixel in fig. 6 is connected to the display scanning line G-disp (i-1), the drain is connected to the data line G (M2), the source is connected to the drain of the tft TG2 of the green sub-pixel, the gate of the tft TG2 is connected to the display scanning line G-disp (i), and the source of the tft TG2 is connected to the display pixel electrode (not shown). In order not to affect the aperture ratio, N-doped polysilicon (N + poly-Si) may be used as a conductor for connecting the tft TG1 and the tft TG2, and the N-doped polysilicon may be disposed below the data line 61 and overlap the data line 61. The circuit connection of the remaining red and blue sub-pixels is similar, and therefore, the detailed description thereof is omitted.
Fig. 7 shows a timing diagram of a display scan line G-disp of the fingerprint display device of the present invention, wherein the fingerprint display device of the present embodiment includes display, touch and fingerprint functions. In fig. 7, DISP represents display, TP represents touch, FP represents fingerprint sensing, Vb represents Vertical blanking (Vertical blanking), FDR represents full-driving signal, and Tol represents a time interval, as shown, display driving and touch sensing are performed in different time periods when fingerprint sensing is not activated (FP off). In the display period, the display scan lines G-disp of consecutive front and back rows are simultaneously turned on during the period of Tol, so the tfts TG1 and TG2 in fig. 6 are simultaneously turned on, and the display data can be updated to the display pixels through the tfts TG1 and TG 2. In the touch sensing period, the display scan line G-disp may send a full driving signal that is the same as the touch sensing driving signal, that is, the voltage swing (voltage swing), phase and frequency of the full driving signal are substantially the same as the signal driving the touch sensing electrode, so as to reduce the load of the touch sensing electrode. When the fingerprint detection is activated (FP on), the update frequency of the display data may be adjusted accordingly in order to match the fingerprint detection and the exposure time, in this embodiment, the update frequency is slowed down. In the fingerprint detection period, there is no time when the front and rear display scan lines G-disp are at the high level at the same time, so the tfts TG1 and TG2 are not turned on at the same time, i.e. the potential of the pixel electrode is kept unchanged. The display scan lines G-disp are sequentially driven to achieve the functions of reading out the fingerprint signal and resetting the capacitor.
Fig. 8 shows an embodiment of the GOA circuit 33 for implementing display driving and fingerprint sensing of the fingerprint display apparatus of the present invention, wherein (a) shows that the GOA circuit for display driving has a plurality of GOA circuit units, wherein the GOA circuit for display driving only needs a start signal STV because the display is displayed on the whole panel 31 without distinguishing blocks; (B) the GOA circuit representing fingerprint sensing has a plurality of GOA circuit units, wherein, since fingerprint sensing is performed on a block of the panel 31, the panel 31 is divided into a plurality of blocks, so the GOA circuit representing fingerprint sensing is also divided into a plurality of blocks by the start signals STV-1, STV-2, STV-3 …, and an operation timing diagram of the fingerprint display device of the present invention is shown in fig. 9, which can be equivalent to the GOA circuit representing fingerprint sensing in fig. 8 (B) to the GOA circuit representing display driving in fig. 8 (a) in the display period, thus being used as the GOA circuit for display driving. In the fingerprint detection period, only the blocks of the selected GOA circuit units are used. That is, the present embodiment enables display-driving and fingerprint-sensing GOA circuit 33 to be used as a display-driving GOA circuit or a fingerprint-sensing GOA circuit by selectively dividing the plurality of GOA circuit units of display-driving and fingerprint-sensing GOA circuit 33 into a plurality of blocks using a plurality of start signals. In addition, the foregoing embodiment is described by taking an example that the GOA circuit only needs one start signal STV, but in practical applications, the GOA circuit may also need a set of start signals STV, for example, a set of start signals STV-1 for fingerprint sensing has four start signals STV-1(1), STV-1(2), STV-1(3), and STV-1(4), then the start signal STV-1(1) is the GOA circuit units of start numbers 1, 5, and 9, the start signal STV-1(2) is the GOA circuit units of start numbers 2, 6, and 10, the start signal STV-1(3) is the GOA circuit units of start numbers 3, 7, and 11, and the start signal STV-1(4) is the GOA circuit units of start numbers 4, 8, and 12.
Fig. 10 shows another embodiment of the GOA circuit 33 for display driving and fingerprint sensing of the fingerprint display device according to the present invention, which is similar to the embodiment of fig. 9, except that the GOA circuit for fingerprint sensing shown in (B) of fig. 10 adds a switch SW between corresponding fingerprint partitions, the switch SW is controlled by the partition signal Ctrl-GOA, during the display period, the partition signal Ctrl-GOA turns on the switch SW, so that the gate output of the previous stage can be connected to the next stage, i.e., the GOA circuit for fingerprint sensing shown in (B) of fig. 10 can be equivalent to the GOA circuit for display driving shown in (a) of fig. 10, and thus can be used as the GOA circuit for display driving. During the fingerprint detection period, the switch SW is turned off by the partition signal Ctrl-GOA, so that each block of the GOA circuit unit operates independently and has the same function as the GOA circuit for fingerprint sensing. That is, the present embodiment selectively divides the plurality of GOA circuit units of the display driving and fingerprint sensing GOA circuit 33 into a plurality of blocks by using the plurality of switches SW, so that the display driving and fingerprint sensing GOA circuit 33 is used as a display driving GOA circuit or a fingerprint sensing GOA circuit.
Fig. 11A shows a circuit diagram of a fingerprint pixel unit 23 of the ith pixel row of the n pixel rows according to another embodiment of the present invention, in which the constituent elements of the fingerprint pixel unit 23 are the same as those of the fingerprint pixel unit 21 of fig. 5A, but a reset switch transistor SW-RST is added. As shown, the photo sensor element PS has a first end e1 and a second end e2 connected to a bias voltage Vbias; the capacitor C has two ends respectively connected to the first end e1 and the second end e2 of the optical sensing element PS, and the capacitor C may be a capacitor structure formed by the internal components of the optical sensing element PS, but not limited thereto, for example, an additionally configured capacitor, or a combination of the two; the reset transistor T1 has a first connection terminal (D), a second connection terminal (S), and a control terminal (G) as a reset terminal RST' and is connected to the ith display scan line G-disp (i) of the n display scan lines G-disp; the reset switch transistor SW-RST has a first connection end (D), a second connection end (S), and a control end (G) connected to a reset switch control trace G-RST, wherein the reset transistor T1 and the reset switch transistor SW-RST are connected in series between the first voltage VDD1 and the first end e1 of the optical sensing element PS through their respective connection ends; the driving transistor T2 has a control terminal (G) connected to the first terminal e1 of the optical sensing element PS, a first connection terminal (D) connected to the second voltage VDD2, and a second connection terminal (S), wherein the first voltage VDD1 and the second voltage VDD2 can be the same DC voltage source or different DC voltage sources; the selection transistor T3 has a control terminal (G) as the selection terminal SEL 'and connected to the i-1 th display scan line G-disp (i-1) of the n display scan lines G-disp, a first connection terminal (D) connected to the second connection terminal (S) of the driving transistor T2, and a second connection terminal (S) as the readout terminal RO' and connected to the readout line RO; in addition, the control terminal (G) of the load transistor T4 is connected to the fifth voltage VB, and the connection terminals (D, S) thereof are connected to the sense line RO and the sixth voltage VSS, respectively. Specifically, the second connection terminal (S) of the reset transistor T1 is connected to the first terminal e1 of the photo sensor element PS, the first connection terminal (D) of the reset transistor T1 is connected to the second connection terminal (S) of the reset switch transistor SW-RST, and the first connection terminal (D) of the reset switch transistor SW-RST is connected to the first voltage VDD 1.
Fig. 11B shows another circuit diagram of the fingerprint pixel unit 23 of the ith pixel row of the n pixel rows according to another embodiment of the present invention, in which the constituent elements of the fingerprint pixel unit 23 are the same as those of the fingerprint pixel unit 21 of fig. 5B, but a reset switch transistor SW-RST is added. As shown, the photo sensor element PS has a first end e1 and a second end e2 as the selection end SEL' and is connected to the i-1 th display scan line G-disp (i-1) of the n display scan lines G-disp; the capacitor C has two ends respectively connected to the first end e1 and the second end e2 of the optical sensing element PS, and the capacitor C may be a capacitor structure formed by the internal components of the optical sensing element PS, but not limited thereto, and may be an additionally configured capacitor, or a combination of the two; the reset transistor T1 has a first connection terminal (D), a second connection terminal (S), and a control terminal (G) as a reset terminal RST' and is connected to the ith display scan line G-disp (i) of the n display scan lines G-disp; the reset switch transistor SW-RST has a control end (G) connected to a reset switch control trace G-RST, a first connection end (D), and a second connection end (S), wherein the reset transistor T1 and the reset switch transistor SW-RST are connected in series between the third voltage SVSS and the first end e1 of the optical sensing element PS through the respective connection ends; the driving transistor T2 has a control terminal (G) connected to the first terminal e1 of the photo sensor element PS, a first connection terminal (D) connected to the fourth voltage SVDD, and a second connection terminal (S) serving as the readout terminal RO' and connected to the readout line RO; in addition, the control terminal (G) of the load transistor T4 is connected to the fifth voltage VB, and the first connection terminal (D) thereof is connected to the sense line RO. Specifically, the second connection terminal (S) of the reset transistor T1 is connected to the first terminal e1 of the photo sensor element PS, the first connection terminal (D) of the reset transistor T1 is connected to the second connection terminal (S) of the reset switch transistor SW-RST, and the first connection terminal (D) of the reset switch transistor SW-RST is connected to the third voltage SVSS.
Fig. 12 is a schematic diagram illustrating the fingerprint pixel unit 23 of fig. 11A integrated into the display pixel unit 41 according to the present invention, which shows that the display pixel unit 41 including three RGB sub-pixels of the LCD is integrated with a fingerprint pixel unit 23, wherein the circuit area of the fingerprint pixel unit 23 is disposed in the right area of one sub-pixel, but this is by way of example and not limitation, and it is conceivable that the circuit area of the fingerprint pixel unit 23 may also be disposed in the lower area of the three RGB sub-pixels. In addition, the present invention is not limited to the LCD panel, and the present invention is also applicable to other types of panels such as OLED, or other pixel arrangements such as RGBW.
In the embodiment of FIG. 12, the LTPS LCD process is taken as an example, and the display scan line G-disp can be made of metal-1 (M1). The data lines 61 connecting the three RGB sub-pixels may be made of metal 2(metal-2, M2), denoted as R (M2), G (M2) and B (M2) in FIG. 6(A), and these data lines 61 function to transmit display data to each display sub-pixel. The gate of the tft TG1 of the green sub-pixel in fig. 12 is connected to the display scanning line G-disp (i-1), the drain is connected to the data line G (M2), the source is connected to the drain of the tft TG2 of the green sub-pixel, the gate of the tft TG2 is connected to the display scanning line G-disp (i), and the source of the tft TG2 is connected to the display pixel electrode (not shown). In order not to affect the aperture ratio, N-doped polysilicon (N + poly-Si) may be used as a conductor for connecting the tft TG1 and the tft TG2, and the N-doped polysilicon may be disposed below the data line 61 and overlap the data line 61. The circuit connection of the remaining red and blue sub-pixels is similar, and therefore, the detailed description thereof is omitted. The reset switch control trace G-RST is made of metal layer 0(metal-0, M0) or metal layer 3(metal-3, M3) and is disposed to overlap the data line 61, so that the aperture ratio is not affected by the introduction of the reset switch control trace G-RST. In addition, the integration of the fingerprint pixel unit 23 of FIG. 11B to the display pixel unit 41 is similar to that of FIG. 12, and thus is not repeated herein.
Fig. 13 is a circuit diagram of the reset switch control trace G-RST in the display area 71 of the panel 31 and the periphery thereof, wherein the reset switch control trace G-RST is connected to the reset voltage V-RST via the first switch SW 1. For control convenience, each of the first switches SW1 may be connected to the same reset switch control signal V-SW-RST, wherein the reset switch control signal V-SW-RST and the reset voltage V-RST are provided by the integrated circuit 39 of FIG. 3. Since the reset switch control trace G-RST overlaps the data line, when the RC load is large, the first switch SW1 is used to avoid the influence of the load, i.e., the first switch SW1 is turned off in the display region to make the reset switch control trace G-RST float (floating), and when the fingerprint detection is performed, the first switch SW1 is turned on; when the RC load is within the acceptable range, the voltage can be directly applied to the reset switch control trace G-RST without providing the first switch SW 1.
The operation of the fingerprint pixel unit 23 shown in fig. 11A or 11B for displaying and sensing a fingerprint is similar to the operation of the fingerprint pixel unit 21 shown in fig. 5A or 5B, but the integrated circuit 39 shown in fig. 3 can be further used to turn on or off the reset switch transistors SW-RST via the reset switch control traces G-RST, so as to further adjust the exposure time and prevent the fingerprint pixel unit 23 from being affected when the display data is updated. When the reset switch control trace G-RST turns on the reset switch transistor SW-RST, the fingerprint pixel unit 23 operates as the non-reset switch transistor SW-RST, and when the reset switch control trace G-RST turns off the reset switch transistor SW-RST in, for example, a fingerprint sensing region (FP), the reset transistor T1 is disabled to discharge the capacitor C, and the added reset switch transistor SW-RST can determine whether the storage capacitor C is reset, so that the exposure time can be adjusted and the fingerprint pixel unit 23 can be prevented from being affected by the update of the display data.
As can be seen from the above description, the reset line RST and the select line SEL of the embedded optical fingerprint sensor are the main cause of the reduction of the aperture ratio, and in the fingerprint display apparatus and the integrated circuit and the method for driving the same of the present invention, the reset line RST and the select line SEL are integrated into the display scan line, so that an additional reset line RST and an additional select line SEL are not required in an optical fingerprint pixel unit, thereby effectively improving the aperture ratio of the panel and achieving the fingerprint sensing function.
The above-described embodiments are merely exemplary for convenience in explanation, and the scope of the claims of the present invention should be determined by the claims rather than by the limitations of the above-described embodiments.
Claims (23)
1. A fingerprint display device is provided with a plurality of pixel rows, each pixel row of n pixel rows in the plurality of pixel rows is provided with a plurality of display pixel units and a plurality of fingerprint pixel units, n is an integer larger than 1, the n pixel rows are at least driven by corresponding n display scanning lines to carry out display and fingerprint sensing, and the fingerprint display device is characterized in that each fingerprint pixel unit is provided with a reset end and a selection end, the reset end of the fingerprint pixel unit of the ith pixel row in the n pixel rows is connected to the ith display scanning line in the n display scanning lines, the selection end of the fingerprint pixel unit of the ith pixel row in the n pixel rows is connected to the i-1 th display scanning line in the n display scanning lines, and i is any integer between 1 and n.
2. The fingerprint display device of claim 1, wherein the fingerprint pixel cells of an ith pixel row of the n pixel rows comprise:
a reset transistor having a control terminal as the reset terminal and connected to the ith display scan line of the n display scan lines, a first connection terminal connected to a first voltage, and a second connection terminal;
a driving transistor having a control terminal connected to the second connection terminal of the reset transistor, a first connection terminal connected to a second voltage, and a second connection terminal;
a selection transistor having a control terminal as the selection terminal and connected to the (i-1) th display scan line of the n display scan lines, a first connection terminal connected to the second connection terminal of the driving transistor, and a second connection terminal;
an optical sensing component, having a second connection end with two ends respectively connected to the reset transistor and a bias voltage; and
and the capacitor is provided with two ends which are respectively connected to the control end of the driving transistor and the bias voltage.
3. The fingerprint display device of claim 2, wherein the second connection terminal of the selection transistor is used as a readout terminal and connected to a readout line, the readout terminals of the fingerprint pixel units in the same column are connected to and share a load transistor, the load transistor has a control terminal connected to a fifth voltage, a first connection terminal connected to the readout line, and a second connection terminal connected to a sixth voltage.
4. The apparatus of claim 2, wherein the display scan lines are sequentially driven, the select transistors of the fingerprint pixel units of an i-th pixel row of the n pixel rows are turned on to read out the fingerprint signal when an i-1 th display scan line of the n display scan lines is driven, and then the i-th display scan line of the n display scan lines is driven to turn on the reset transistors of the fingerprint pixel units of the i-th pixel row of the n pixel rows to reset the level of the capacitor.
5. The apparatus of claim 1, wherein the n pixel rows are disposed on a panel, and a display driver and fingerprint sensor GOA circuit is controlled by an integrated circuit to drive the n display scan lines for display and fingerprint sensing, wherein the sensed fingerprint data is read out to the integrated circuit for fingerprint identification.
6. The apparatus of claim 5, wherein the display driving and fingerprint sensing GOA circuit has a plurality of GOA circuit units divided into a plurality of blocks by a plurality of start signals.
7. The apparatus of claim 5, wherein the display driving and fingerprint sensing GOA circuit has a plurality of GOA circuit units, and the GOA circuit units are divided into a plurality of blocks by a plurality of switches.
8. The fingerprint display device of claim 5, wherein the panel senses a touch of a user's finger and transmits a touch signal to the integrated circuit to provide a touch sensing function.
9. The apparatus of claim 2, wherein the display scan line is formed of a metal layer 1, the data line connecting the sub-pixels of the display pixel unit is formed of a metal layer 2, and a sub-pixel has two TFTs connected by N-doped polysilicon disposed under and overlapping the data line.
10. The fingerprint display apparatus according to claim 8, wherein when the fingerprint detection is not activated, the display driving and the touch sensing are performed on the panel at different times, wherein, when the display driving is performed, consecutive front and rear display scanning lines are simultaneously turned on within a predetermined time, and when the touch sensing is performed, a full driving signal identical to the touch sensing driving signal is sent to the display scanning lines; when fingerprint detection is started, continuous front and back display scanning lines are not started at the same time when fingerprint detection is carried out.
11. The fingerprint display device of claim 1, wherein the fingerprint pixel cells of an ith pixel row of the n pixel rows comprise:
a reset transistor having a control terminal as the reset terminal and connected to the ith display scan line of the n display scan lines, a first connection terminal connected to a third voltage, and a second connection terminal;
a driving transistor having a control terminal connected to the second connection terminal of the reset transistor, a first connection terminal connected to a fourth voltage, and a second connection terminal;
an optical sensing element having a first end connected to the second connection end of the reset transistor and a second end as a selection end and connected to the (i-1) th display scan line of the n display scan lines; and
and the capacitor is provided with two ends which are respectively connected to the control end of the driving transistor and the second end of the optical sensing component.
12. The fingerprint display device of claim 11, wherein the second connection terminal of the driving transistor is used as a readout terminal and connected to a readout line, the readout terminals of the fingerprint pixel units in the same column are connected to and share a load transistor, the load transistor has a control terminal connected to a fifth voltage, a first connection terminal connected to the readout line, and a second connection terminal.
13. The fingerprint display apparatus of claim 11, wherein the display scan lines are sequentially driven, and when the i-1 display scan line of the n display scan lines is driven, power is supplied to the optical sensing device of the fingerprint pixel unit of the i-th pixel row of the n pixel rows to increase the voltage level of the selection terminal, so as to turn on the driving transistor to read out the fingerprint signal, and then the i-th display scan line of the n display scan lines is driven to turn on the reset transistor of the fingerprint pixel unit of the i-th pixel row of the n pixel rows to reset the level of the capacitor.
14. The fingerprint display device of claim 1, wherein the fingerprint pixel cells of an ith pixel row of the n pixel rows comprise:
an optical sensing element having a first end and a second end connected to a bias voltage;
a capacitor having two ends respectively connected to the first end and the second end of the optical sensing assembly;
a reset transistor having a control terminal as the reset terminal and connected to the ith display scan line of the n display scan lines, a first connection terminal, and a second connection terminal;
a reset switch transistor having a control end connected to a reset switch control trace, a first connection end, and a second connection end, wherein the reset transistor and the reset switch transistor are connected in series between a first voltage and the first end of the optical sensing assembly;
a driving transistor having a control terminal connected to the first terminal of the optical sensing element, a first connection terminal connected to a second voltage, and a second connection terminal; and
a selection transistor having a control terminal as the selection terminal and connected to the (i-1) th display scan line of the n display scan lines, a first connection terminal connected to the second connection terminal of the driving transistor, and a second connection terminal.
15. The fingerprint display device of claim 14, wherein the second connection terminal of the selection transistor is used as a readout terminal and connected to a readout line, the readout terminals of the fingerprint pixel units in the same column are connected to and share a load transistor, the load transistor has a control terminal connected to a fifth voltage, a first connection terminal connected to the readout line, and a second connection terminal connected to a sixth voltage.
16. The fingerprint display device according to claim 14, wherein the second connection terminal of the reset transistor T1 is connected to the first terminal of the optical sensing element, the first connection terminal of the reset transistor is connected to the second connection terminal of the reset switch transistor, and the first connection terminal of the reset switch transistor is connected to the first voltage.
17. The fingerprint display device of claim 14, wherein the reset switch transistor is controlled by a reset switch control trace to determine whether to turn on or off the reset switch transistor.
18. The fingerprint display device of claim 1, wherein the fingerprint pixel cells of an ith pixel row of the n pixel rows comprise:
an optical sensing assembly having a first end and a second end as selection ends and connected to the (i-1) th display scan line of the n display scan lines;
a capacitor having two ends respectively connected to the first end and the second end of the optical sensing assembly;
a reset transistor having a control terminal as the reset terminal and connected to the ith display scan line of the n display scan lines, a first connection terminal, and a second connection terminal;
a reset switch transistor having a control end connected to a reset switch control trace, a first connection end, and a second connection end, wherein the reset transistor and the reset switch transistor are connected in series between a third voltage and the first end of the optical sensing assembly; and
the driving transistor is provided with a control end connected to the first end of the optical sensing component, a first connecting end connected to a fourth voltage and a second connecting end.
19. The fingerprint display device of claim 18, wherein the second connection terminal of the driving transistor is used as a readout terminal and connected to a readout line, the readout terminals of the fingerprint pixel units in the same column are connected to and share a load transistor, the load transistor has a control terminal connected to a fifth voltage, a first connection terminal connected to the readout line, and a second connection terminal.
20. The fingerprint display device of claim 18, wherein the second connection terminal of the reset transistor is connected to the first terminal of the optical sensing element, the first connection terminal of the reset transistor is connected to the second connection terminal of the reset switch transistor, and the first connection terminal of the reset switch transistor is connected to the third voltage.
21. The fingerprint display device of claim 18, wherein the reset switch transistor is controlled by a reset switch control trace to determine whether to turn on or off the reset switch transistor.
22. A driving method of a fingerprint display device, the fingerprint display device having a plurality of pixel rows, each of n pixel rows of the plurality of pixel rows having a plurality of display pixel units and a plurality of fingerprint pixel units, n being an integer greater than 1, the n pixel rows being driven by at least corresponding n display scan lines for display and fingerprint sensing, each fingerprint pixel unit having a reset terminal and a select terminal, the method comprising:
and sequentially driving the n display scanning lines, wherein when driving the (i-1) th display scanning line in the n display scanning lines, a selection end of the fingerprint pixel units of the ith pixel row in the n pixel rows is started, and when driving the ith display scanning line in the n display scanning lines, a reset end of the fingerprint pixel units of the ith pixel row in the n pixel rows is started, wherein i is any integer between 1 and n.
23. An integrated circuit for controlling the fingerprint display device of claim 1,2, 6, 7, 11, 14 or 18 to sequentially drive the display scan lines for display and fingerprint sensing.
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| US202063046178P | 2020-06-30 | 2020-06-30 | |
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| CN202011499662.XA Pending CN113867023A (en) | 2020-06-30 | 2020-12-18 | Fingerprint display apparatus and integrated circuit and method for driving the same |
| CN202011505616.6A Pending CN113869094A (en) | 2020-06-30 | 2020-12-18 | Fingerprint display apparatus and integrated circuit and method for driving the same |
| CN202011505623.6A Pending CN113869095A (en) | 2020-06-30 | 2020-12-18 | Fingerprint display apparatus and integrated circuit and method for driving the same |
| CN202011505647.1A Pending CN113869096A (en) | 2020-06-30 | 2020-12-18 | Fingerprint pixel unit, fingerprint display apparatus, and integrated circuit and method for driving the same |
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| CN202011505623.6A Pending CN113869095A (en) | 2020-06-30 | 2020-12-18 | Fingerprint display apparatus and integrated circuit and method for driving the same |
| CN202011505647.1A Pending CN113869096A (en) | 2020-06-30 | 2020-12-18 | Fingerprint pixel unit, fingerprint display apparatus, and integrated circuit and method for driving the same |
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| TWI782722B (en) * | 2021-09-28 | 2022-11-01 | 友達光電股份有限公司 | Sensing device and operation method thereof |
| CN114581964A (en) * | 2022-02-22 | 2022-06-03 | 业泓科技(成都)有限公司 | Screen lower fingerprint identification circuit and laminated structure thereof, display panel and fingerprint acquisition method |
| TWI815657B (en) * | 2022-09-13 | 2023-09-11 | 友達光電股份有限公司 | Touch sensing device |
| TWI817716B (en) * | 2022-09-13 | 2023-10-01 | 友達光電股份有限公司 | Touch sensing device |
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| TW202202993A (en) | 2022-01-16 |
| CN113869095A (en) | 2021-12-31 |
| TWI748806B (en) | 2021-12-01 |
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| CN113869094A (en) | 2021-12-31 |
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| TWI765481B (en) | 2022-05-21 |
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| TWI764448B (en) | 2022-05-11 |
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