TW202203194A - Fingerprint display device and integrated circuit and method for driving the same - Google Patents

Abstract

A fingerprint display device has a plurality of pixel rows. Each pixel row of n pixel rows in the plurality of pixel rows has a plurality of display pixel units and a plurality of fingerprint pixel units, where n is an integer greater than 1. The n pixel rows are driven at least by corresponding n display scan lines and n reset and select multiplex lines for performing display and fingerprint detection. Each fingerprint pixel unit has a reset end and a select end. The reset end of the fingerprint pixel unit of i-th pixel row among the n pixel rows is connected to the i-th reset and select multiplex line among the n reset and select multiplex lines, and the select end of the fingerprint pixel unit of i-th pixel row among the n pixel rows is connected to the (i-1)-th reset and select multiplex line among the n reset and select multiplex lines, where i is an index value between 1 and n.

Description

Fingerprint display device and integrated integrated circuit and method for driving the same

The present invention relates to a fingerprint display device, in particular to a fingerprint display device integrating an optical fingerprint sensor and a flat display panel, and an integrated circuit and method for driving the same.

FIG. 1 is a schematic diagram illustrating the integration of an optical fingerprint sensor and a liquid crystal display (LCD display) panel. The 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 the light from the backlight from the reflective layer 14 encounters the glass substrate 15 The finger on it can be reflected to the fingerprint sensor 11 , and since the reflectivity of the peaks and valleys of the fingerprint is different, the fingerprint image can be reconstructed according to the sensing amount of the fingerprint sensor 11 .

In order to drive the aforementioned fingerprint sensor for fingerprint identification on the display panel, it is generally necessary to additionally set a reset line (RST) and a select line (SEL) to control the operation of the fingerprint sensor 11. However, due to the optical The fingerprint sensor 11 is embedded in the pixels of the liquid crystal display panel. Therefore, the additional reset lines and select lines will greatly reduce the aperture ratio of the liquid crystal display panel, resulting in a decrease in display brightness.

Therefore, there are still many deficiencies in the design of the conventional fingerprint display device, and it is necessary to improve it.

The main purpose of the present invention is to provide a fingerprint display device and an integrated circuit and method for driving the same. Panel aperture ratio.

According to a feature of the present invention, a fingerprint display device is provided, which has a plurality of pixel rows, and each pixel row of n pixel rows in the plurality of pixel rows has a plurality of display pixel units and a plurality of fingerprint images. pixel unit, n is an integer greater than 1, the n pixel rows are driven by at least corresponding n display scan lines and n reset and selection multiplexing lines for display and fingerprint sensing, wherein each The fingerprint pixel unit has a reset terminal and a selection terminal, and the reset terminal of the fingerprint pixel unit of the i-th pixel row in the n pixel rows is connected to the n reset and selection multiplexing lines. The i-th reset and selection multiplexing line, the select end of the fingerprint pixel unit of the i-th pixel column in the n pixel columns is connected to the i-1 th of the n reset and selection multiplexing lines reset and select multiplexed lines, where i is any integer from 1 to n.

According to another feature of the present invention, a method for driving a fingerprint display device is provided. The fingerprint display device has a plurality of pixel rows, and each pixel row of n pixel rows in the plurality of pixel rows has a plurality of displays. A pixel unit and a plurality of fingerprint pixel units, n is an integer greater than 1, the n pixel rows are driven by at least corresponding n display scan lines and n reset and selection multiplexing lines for display and Fingerprint sensing, each fingerprint pixel unit has a reset terminal and a selection terminal, the method includes: sequentially driving the n reset and selection multiplexing lines, wherein, after driving the n reset and selection multiplexing lines When the i-1 th line is used to reset and select the multiplexed line, it is to activate the reset end of the fingerprint pixel unit of the i-1 th pixel column of the n pixel columns and activate the n pixels. The selected end of the fingerprint pixel unit of the i-th pixel column in the pixel column, where i is any integer between 1 and n.

According to a further feature of the present invention, an integrated integrated circuit is provided for controlling the aforementioned fingerprint display device to sequentially drive display scan lines for display, and sequentially drive reset and selection multiplex lines to perform fingerprinting Sensing.

The above overview and the following detailed description are exemplary in nature, and are intended to further illustrate the scope of the present invention, and other objects and advantages of the present invention will be explained in the following descriptions and drawings.

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the embodiments of the present invention, and are not used to limit the present invention.

FIG. 2(A) 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 composed of a reset transistor T1 and a drive transistor T2 , a selection transistor T3, a photo sensor PS, and a capacitor C are realized, and an array composed of a plurality of fingerprint pixel units 21 constitutes a fingerprint sensor, wherein, in a plurality of fingerprints In the array composed of pixel units, the fingerprint pixel units 21 in the same row share a load transistor T4, such as the load transistor T4 connected to the fingerprint pixel unit 21 as shown in FIG. 2(A). . In addition, the transistors T1-T4 shown in FIG. 2(A) are NMOS transistors, but this is only an example and not a limitation. It is conceivable that the transistors T1-T4 can also be other types of MOS transistors. crystals, such as PMOS transistors. Each transistor T1-T4 has a control terminal and two connection terminals. For a MOS transistor, the control terminal is the gate (G), and the two connection terminals are the drain (D) and the source (S). In addition, alternatively, the reset transistor T1 can be formed in the form of dual gates. Furthermore, the aforementioned reset transistor T1, driving transistor T2 or selection transistor T3 is not limited to be a single transistor , which may also be formed by connecting two transistors with control terminals connected in series.

In the aforementioned optical fingerprint pixel unit 21 of FIG. 2(A), the control terminal (G) of the reset transistor T1 is connected to the reset line RST, and the two connection terminals (D, S) thereof are respectively connected to the first voltage VDD1 and the reset line RST. 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 two connection terminals (D, S) thereof are respectively connected to the second voltage VDD2 and the selection transistor T3 The connection terminal (D) of , 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 the selection line SEL, and the two connection terminals (D, S) of the selection transistor T3 are respectively connected to the connection terminal (S) of the driving transistor T2 and the readout line RO. The two ends of the capacitor C are respectively connected to the control terminal (G) of the driving transistor T2 and the bias voltage Vbias. The capacitor C can be a capacitor structure formed by the optical sensing element PS itself, or an additionally configured capacitor structure, or a combination of the two. Two ends of the optical sensing element PS are respectively connected to the connection terminal (S) of the reset transistor T1 and the bias voltage Vbias. The control terminal (G) of the load transistor T4 is connected to the fifth voltage VB, and the two connection terminals (D, S) thereof are respectively connected to the readout line RO and the sixth voltage VSS.

The operation of fingerprint sensing performed by the optical fingerprint pixel unit 21 of the aforementioned FIG. 2(A) is as follows: firstly, the reset line RST is driven to turn on the reset transistor T1, and the terminal voltage of the capacitor C is reset to a preset value, That is, the first voltage VDD; then, the reset transistor T1 is turned off, so that the optical sensing element PS is continuously exposed for a period of time, and the discharge amount of the capacitor C varies with the illumination intensity and exposure time. The point voltages are also different; when the preset 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 the same as that of the capacitor C connected to the drive transistor. The voltage at the end of the control terminal (G) of the crystal T2 is related to the light intensity and exposure time, and the load transistor T4 connected to the readout line RO is equivalent to an active load. Therefore, the readout The voltage of the readout terminal RO" of the outgoing line RO is related to the resistance of the reset transistor T1 and the active load. By reading the voltage of the readout terminal RO" by the integrated circuit, the illumination intensity can be judged.

FIG. 2(B) shows a circuit diagram of another optical fingerprint pixel unit 21 , which is a two-transistor (2T) fingerprint pixel circuit. The fingerprint pixel unit 21 is composed of a reset transistor T1 and a driving transistor. T2 is realized by a photo sensor PS and a capacitor C, and an array composed of a plurality of fingerprint pixel units 21 constitutes a fingerprint sensor, wherein a plurality of fingerprint pixel units 21 are formed In the array, the fingerprint pixel units 21 in the same row share a load transistor T4, such as the load transistor T4 connected to the fingerprint pixel unit 21 as shown in FIG. 2(B). In addition, the transistors T1, T2 and T4 shown in FIG. 2(B) are NMOS transistors, but this is only an example and not a limitation. It is conceivable that the transistors T1, T2 and T4 can also be other transistors type of MOS transistor, such as a PMOS transistor. Each transistor T1, T2 and T4 has a control terminal and two connection terminals. For a MOS transistor, the control terminal is the gate (G), and the two connection terminals are the drain (D) and the source (S). ) . In addition, alternatively, the reset transistor T1 can be formed in the form of dual gates. Furthermore, the reset transistor T1 or the driving transistor T2 is not limited to be a single transistor, it may also be a single transistor. Two transistors with control terminals connected together are connected in series.

In the optical fingerprint pixel unit 21 of the aforementioned FIG. 2(B), the control terminal (G) of the reset transistor T1 is connected to the reset line RST, and the two connection terminals (D, S) of the reset transistor T1 are respectively connected to the third voltage SVSS and the reset line RST. 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 two connection terminals (D, S) thereof are respectively connected to the fourth voltage SVDD and the readout line RO . Two ends of the optical sensing 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 respectively connected to the connection terminal (S) of the reset transistor T1, the control terminal (G) of the drive transistor T2, and the selection line SEL. The capacitor C can be the internal component of the optical sensing element PS. Constructed capacitive structures, or additionally configured capacitive structures, or a combination of both. 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 readout line RO.

The operation of fingerprint sensing performed by the optical fingerprint pixel unit 21 of the aforementioned FIG. 2(B) is as follows: firstly, the reset line RST is driven to turn on the reset transistor T1, and the terminal voltage Vp of the capacitor C is reset to a preset value , that is, 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, so that the optical sensing element PS is continuously exposed for a period of time, and with the illumination intensity and exposure time The discharge amount of the capacitor C is different, so the terminal voltage Vp of the capacitor C is also different; when the preset exposure time is reached, the selection line SEL is driven to switch the voltage of the selection line SEL from a low level to a high level. (potential difference ΔV), and due to the coupling effect, the terminal voltage Vp of the capacitor C will also increase by ΔV approximately, so the drive transistor T2 can be turned on and output current to the readout line RO. The output current is related to the terminal voltage Vp of the capacitor C, that is, related to the illumination intensity and exposure time. The load transistor T4 connected to the readout line RO is equivalent to an 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. By reading the voltage of the readout terminal RO" by the integrated circuit, the illumination intensity can be determined.

In order to avoid the problem that the aperture ratio of the display panel is greatly reduced due to additionally setting the reset line RST and the selection line SEL as shown in FIGS. 2(A) and 2(B), in an embodiment of the fingerprint display device of the present invention, the By multiplexing the reset line RST and the select line SEL of adjacent rows, only one reset and select multiplexing line G-comb is required for an optical fingerprint pixel unit. Please refer to FIG. 3 first to show the system structure diagram of the fingerprint display device of the present invention, wherein a GOA (gate on array) circuit 33 of display gate is provided on the left and right sides of a panel 31 to be used according to an integrated product The control signals of the bulk circuit 39 are used to sequentially drive the display scan lines G-disp for display. In addition, in order to realize the fingerprint detection function, GOA circuits 35 for fingerprint sensing and driving are provided on the left and right sides of the panel 31 for sequentially driving the reset and selection multiplexing lines G according to the control signal of the integrated integrated circuit 39 -comb for fingerprint sensing, and the sensed fingerprint data is read by the readout line RO to the integrated integrated circuit 39 for fingerprint identification. Specifically, in the actual circuit, the readout line RO extends out After the panel 31 , the same line can be multiplexed with the data line through a multiplexer to enter the integrated integrated circuit 39 , so as to save the number of pins of the integrated 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 present embodiment shows that the GOA circuit 33 for display driving and the GOA circuit 35 for fingerprint sensing driving are both disposed on the left and right sides of the panel 31, the present invention is not limited to this. In other embodiments, the display driving The GOA circuit 33 and the fingerprint sensing driving GOA circuit 35 can also be arranged on the same side of the panel 31, or the display driving GOA circuit 33 can be arranged on one side of the panel 31, and the fingerprint sensing driving GOA circuit 35 is provided on the opposite side of the panel 31 . In addition, the panel 31 of the fingerprint display device of the present invention can also provide a touch sensing function, for example, by cutting the common electrode of the panel 31 as a touch sensor (not shown), the touch sensor senses the touch of the user's finger The touch signal is transmitted to the integrated integrated circuit 39 for touch detection to realize the touch sensing function. The cutting of the common electrode as a touch sensor is known to those skilled in the art, so it is not repeated here. That is to say, in one embodiment, the present invention can provide an electronic device with three-in-one functions of fingerprint sensing, touch sensing and display, and an integrated circuit for driving the electronic device and a driving method thereof.

3 shows that the fingerprint display device of the present invention has a plurality of pixel rows (rows) 37. In the plurality of pixel rows 37, there are n pixel rows 37 that can provide display and fingerprint identification functions, and 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 supported by at least n display scan lines G -disp and n reset and select multiplexing lines G-comb are driven for display and fingerprint sensing. In one embodiment, the number of display pixel units 41 in a pixel row 37 is the same as the number of fingerprint pixel units 21 . However, the present invention is not limited to this. The number of fingerprint pixel units 21 in the pixel row 37 may be less than the number of display pixel units 41. In addition, the pixel row 37 in the entire display area of the panel 31 may have both display pixel units 41 and fingerprint pixel units 21. Or only a part of the display area, for example, the pixel row 37 of one third of the display area has the display pixel unit 41 and the fingerprint pixel unit 21, while the pixel row 37 of the remaining display area only has the display pixel unit 41 and the fingerprint pixel unit 21. The pixel unit 41 is displayed.

Please also refer to FIG. 4 , which schematically shows the i-1 th, i th, and i+1 th pixel rows 37 among the n pixel rows 37 of the fingerprint display device, wherein the pixel row 37 has display pixels. The unit 41 is the same as the fingerprint pixel unit 21 as shown in FIG. 2(A) or 2(B). The figure shows that a display pixel unit 41 in a pixel row 37 corresponds to a fingerprint pixel unit 21, but this is only For convenience of description and not limitation. The display pixel units 41 of the same pixel row 37 are connected to the same display scan line G-disp, and the fingerprint pixel units 21 on the same pixel row 37 are connected to the reset and selection multiplexing line G corresponding to the pixel row 37 -comb and the reset and selection multiplexing lines G-comb corresponding to the previous pixel row 37, accordingly, the n pixel rows 37 are corresponding to n display scan lines G-disp and n resets and the selection multiplexing line G-comb is driven for display and fingerprint sensing, wherein each fingerprint pixel unit 21 has a reset terminal RST' and a selection terminal SEL'. The reset terminal RST' of the fingerprint pixel unit 21 of the ith pixel row is connected to the ith reset and selection multiplexing line G-comb(i) among the n reset and selection multiplexing lines G-comb , the selection terminal SEL' of the fingerprint pixel unit 21 of the i-th pixel column in the n pixel columns 37 is connected to the i-1-th reset in the n reset and selection multiplexing lines G-comb and select the multiplexed line G-comb(i-1), where i is any integer between 1 and n. Accordingly, the fingerprint display device of the present invention uses the i-th display scan line G-disp(i) among the n display scan lines G-disp to drive the display of the i-th pixel row among the n pixel rows 37 The pixel unit 41 is used for display, and the i-1th reset and selection multiplexing line G-comb(i-1) and the i-th multiplexing line G-comb(i-1) among the n reset and selection multiplexing lines G-comb are used. The set and selection multiplexing line G-comb(i) drives the selection terminal SEL' and the reset terminal RST' of the fingerprint pixel unit 21 of the i-th pixel row in the n pixel rows 37 for fingerprint sensing.

Please also refer to FIG. 5(A) to show a circuit diagram of the fingerprint pixel unit 21 of the i-th pixel row among the n pixel rows 37 according to an embodiment of the present invention, wherein the reset transistor T1 has a 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 n reset and selection multiplexing lines The ith reset and selection multiplexing line G-comb(i) in G-comb, the first connection terminal (D) is connected to the first voltage VDD1; the driving transistor T2 has a control terminal (G), A first connection end (D) and a second connection end (S), the control end (G) is connected to the second connection end (S) of the reset transistor T1, the first connection end (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) and a first connection terminal (D) and a second connection terminal (S), the control terminal (G) is used as a selection terminal SEL' and is connected to the i-1th reset and selection multiplexing line G-comb of the n reset and selection multiplexing lines G-comb With line G-comb(i-1), the first connection terminal (D) is connected to the second connection terminal (S) of the driving transistor T2, the second connection terminal (S) serves as the readout terminal RO' and connected to the readout line RO; the photo sensor PS has a second connection terminal (S) and a bias voltage Vbias whose two ends are respectively connected to the reset transistor T1 ; and the capacitor C has two ends connected respectively to the control terminal (G) of the driving transistor T2 and the bias voltage Vbias. In one embodiment, the above-mentioned capacitor C may be a capacitor structure formed by the internal elements of the optical sensing element PS, but it is not limited thereto.

It can be seen from FIG. 5(A) that the present invention can replace the original two reset lines RST and select lines SEL with one reset and select multiplexing line G-comb, so that one pixel can be driven by reducing one driving line. columns, so the panel penetration rate can be improved. The reset and selection multiplexing lines G-comb(1), G-comb(2)...G-comb(n-1), G-comb(n) in the entire fingerprint sensing array are sequentially driven. When When the reset and selection multiplexing line G-comb(i-1) is driven, the selection transistor T3 of the fingerprint pixel unit 21 of the i-th pixel row among the n pixel rows is turned on to read out the fingerprint signal, Then, the reset and selection multiplexing line G-comb(i) is driven to turn on the reset transistor T1 to reset the level of the capacitor C to achieve the effect of fingerprint sensing.

5(B) shows another circuit diagram of the fingerprint pixel unit 21 of the i-th pixel row among the n pixel rows according to an 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 n reset and selection multiplexing lines G-comb The i-th reset and selection multiplexing line G-comb(i), the first connection terminal (D) is connected to a third voltage SVSS; the driving transistor T2 has a control terminal (G), a first connecting terminal (D) and a second connecting terminal (S), the control terminal (G) is connected to the second connecting terminal (S) of the reset transistor T1, the first connecting terminal (D) is connected to a first connecting terminal (S) Four voltages SVDD, the second connection terminal (S) serves as the readout terminal RO' and is connected to the readout line RO; the photo sensor PS has a first terminal and a second terminal, the first terminal is connected to the heavy Set the second connection terminal (S) of the transistor T1, the second terminal is used as the selection terminal SEL' and is connected to the i-1th reset and selection of the n reset and selection multiplexing lines G-comb The multiplexed line G-comb(i-1); the capacitor C has two ends respectively connected to the control end (G) of the driving transistor T2 and the second end of the optical sensing element PS. In one embodiment, the above-mentioned capacitor C may be a capacitor structure formed by the internal elements of the optical sensing element PS, but it is not limited thereto.

It can be seen from FIG. 5(B) that the present invention can replace the original two reset lines RST and select lines SEL with one reset and select multiplexing line G-comb, so that one pixel can be driven by reducing one driving line. columns, so the panel penetration rate can be improved. The reset and selection multiplexing lines G-comb(1), G-comb(2)...G-comb(n-1), G-comb(n) in the entire fingerprint sensor array are sequentially driven , when the reset and selection multiplexing line G-comb(i-1) is driven, power is supplied to the optical sensing element PS of the fingerprint pixel unit 21 of the i-th pixel column in the n pixel columns to improve the selection terminal SEL ' voltage level, and then turn on the driving transistor T2 to read out the fingerprint signal. Then, the reset and selection multiplexing line G-comb(i) is driven to turn on the reset transistor T1 of the fingerprint pixel unit 21 of the i-th pixel column among the n pixel columns to reset the level of the capacitor C , to achieve the effect of fingerprint sensing. In addition, in FIG. 5(B), due to the exposure time of the fingerprint pixel unit 21, the reset and selection multiplexing lines G-comb(i-1) and G-comb(i) are maintained at the same level. When the exposure is large, because the photocurrent of the optical sensing element PS is relatively large, the terminal potential Vp of the capacitor C is very close to or even equal to the potential of the reset and selection multiplexing line G-comb, that is, the reset transistor The Vgs of T1 is close to 0V, and to prevent the reset transistor T1 from being turned on during the exposure time, an extra gate can be added to the reset transistor T1, that is, as shown in the figure, the reset transistor T1 can be a top The gate (Top Gate) transistor is connected to a bottom gate (Bottom Gate, BG), and the threshold voltage (Vth) of the reset transistor T1 can be adjusted by adjusting the voltage of the bottom gate (BG) ) to adjust the threshold voltage (Vth) to a preset ideal value without changing the process conditions, so as to ensure that the reset transistor T1 will not be turned on during the exposure time.

6 shows a schematic diagram of the fingerprint pixel unit 21 of FIG. 5(A) integrated into the display pixel unit 41 of the present invention, which shows that the display pixel unit 41 including three sub-pixels of RGB of the LCD integrates a fingerprint pixel unit 21 , wherein, the circuit area of the fingerprint pixel unit 21 is arranged in the lower area of the three sub-pixels of RGB, but this is only an example and not a limitation. It is conceivable that the circuit area of the fingerprint pixel unit 21 can also be centrally arranged in The area below a particular subpixel. In addition, the present embodiment takes an LCD panel as an example, but the present invention is not limited thereto. The present invention is also applicable to other types of panels such as OLED, or other pixel arrangements such as RGBW. Although the pixel unit 41 and the fingerprint pixel unit 21 are shown in the figure as different pixel rows, in other embodiments, they can also be classified into the same pixel row. In the present invention, the display pixel units 41 are mainly displayed in multiple The fingerprint pixel unit 21 can be arranged between the RGB sub-pixels of the RGB, and whether the same row is not limited can be adjusted according to the design requirements.

In the embodiment of FIG. 6 , taking the LTPS LCD process as an example, the display scan line G-disp and the reset and selection multiplexing line G-comb can be made of metal layer 1 (metal-1, M1). The data lines 61 connecting the three sub-pixels of RGB can be made of metal layer 2 (metal-2, M2), which are marked as R(M2), G(M2) and B(M2) in FIG. 6 . The function is to send display data to each display subpixel. In one embodiment, the reset and selection multiplexing line G-comb(i-1) can be transferred from M1 to other conductive layers, such as metal layer 0 (metal-0, M0), through vias 63, Then, the traces 65 of the metal layer 0 are connected to the circuit area of the fingerprint pixel unit 21 in the i-th column. In order not to affect the aperture ratio, the traces 65 of the metal layer 0 can be disposed below the data lines 61 and substantially overlap with the data lines 61 . In another embodiment, the above-mentioned conductive layer used for layer transfer may be metal layer 3 (metal-3, M3), and the wiring 65 is disposed above the data line 61 and substantially overlaps along the data line 61 stretch.

FIG. 7(A) shows an operation timing diagram of the fingerprint display device using the fingerprint pixel unit 21 of FIG. 5(A) of the present invention. The fingerprint display device of this embodiment includes the functions of display, touch and fingerprint. In Figure 7(A), DISP stands for display, TP stands for touch, FP stands for fingerprint sensing, Vb stands for Vertical blanking, Hi-Z stands for High Impendence, FDR stands for Full Drive Drive), as shown in FIG. 7(A), when fingerprint detection is not activated (FP off), display driving and touch sensing are performed in a time-sharing manner. Among them, in the display period (DISP), in order to reduce the capacitive load of the reset and selection multiplexing line G-comb on the data line 61, the reset and selection multiplexing line G-comb is set to high impedance (Hi-Z), That is, the reset and selection multiplexing line G-comb is not electrically connected to the voltage source and becomes a floating state, so the capacitive load on the data line 61 can be reduced. However, the present invention is not limited to this. The capacitive load of the data line 61 is within an acceptable range, and the reset and selection multiplexing line G-comb can also be connected to a voltage source. During the touch sensing period (TP), the reset and selection multiplexing line G-comb can send the same full drive signal as the touch sensing driving signal, that is, the voltage swing, The phase and frequency are approximately the same as the signal driving the touch sensing electrodes, thereby reducing the load on the touch sensing electrodes. When the fingerprint detection is activated (FP on), in order to match the fingerprint detection and exposure time, the update frequency of the displayed data can be adjusted accordingly. In this embodiment, the update frequency is slowed down. During the fingerprint detection period, the reset and selection multiplexing lines G-comb are sequentially driven to achieve the aforementioned functions of reading the fingerprint signal and resetting the capacitor.

FIG. 7(B) shows another operation timing diagram of the fingerprint display device using the fingerprint pixel unit 21 of FIG. 5(A) of the present invention, which is similar to FIG. 7(A), except that the interval is vertical, for example For a period of time in the blanking (Vb) interval, connect the reset and selection multiplexing line G-comb to the DC bias voltage (DC bias) to avoid the reset and selection multiplexing line G-comb being floating for a long time. In the connected state, the potential is unstable, or charges are accumulated near the reset and selection multiplexing line G-comb.

8 shows a schematic diagram of the fingerprint pixel unit 21 of FIG. 5(B) integrated into the display pixel unit 41 of the present invention, which shows that the display pixel unit 41 including the three sub-pixels of RGB of the LCD integrates a fingerprint pixel unit 21 , wherein, the circuit area of the fingerprint pixel unit 21 is arranged in the lower area of the three sub-pixels of RGB, but this is only an example and not a limitation. It is conceivable that the circuit area of the fingerprint pixel unit 21 can also be centrally arranged in The area below a particular subpixel. In addition, the present embodiment takes an LCD panel as an example, but the present invention is not limited thereto. The present invention is also applicable to other types of panels such as OLED, or other pixel arrangements such as RGBW. Although the pixel unit 41 and the fingerprint pixel unit 21 are shown in the figure as different pixel rows, in other embodiments, they can also be classified into the same pixel row. In the present invention, the display pixel units 41 are mainly displayed in multiple The fingerprint pixel unit 21 can be arranged between the RGB sub-pixels of the RGB, and whether the same row is not limited can be adjusted according to the design requirements.

In the embodiment of FIG. 8 , taking the LTPS LCD process as an example, the display scan line G-disp and the reset and selection multiplexing line G-comb can be made of metal layer 1 (metal-1, M1). The data lines 61 of the three sub-pixels of RGB can be made of metal layer 2 (metal-2, M2), which are marked as R(M2), G(M2) and B(M2) in FIG. 8. The functions of these data lines 61 Sends display data to each display subpixel. In one embodiment, the reset and selection multiplexing line G-comb(i-1) can be transferred from metal layer 1 to other conductive layers, such as metal layer 0 (metal-0, M0), through vias 63 ), and then connected to the circuit area of the fingerprint pixel unit 21 in the i-th column by the trace 65 of the metal layer 0 . In order not to affect the aperture ratio, the metal layer 0 wiring 65 can be designed under the data line 61 and overlap with the data line 61 . In addition, the bottom gate line 81 connected to the bottom gate (BG) of the reset transistor T1 can be made of the metal layer 0 , and is disposed under the data line 61 and overlapped with the data line 61 . In another embodiment, the above-mentioned conductive layer used for layer transfer may be metal layer 3 (metal-3, M3), and the wiring 65 is disposed above the data line 61 and substantially overlaps along the data line 61 stretch.

9 shows a schematic diagram of the wiring diagram of the bottom gate line 81 of the reset transistor T1 on the panel 31 , wherein, at the periphery of the active area 311 of the panel 31 , the bottom gate line 81 is connected to a bottom gate line 81 via a switch 91 The gate bias voltage V-BG, the switch 91 is controlled by a switch signal SW-BG to be turned on or off. Because the bottom gate line 81 overlaps with the data line 61 , during display data writing, the switch 91 is turned off so that the bottom gate line 81 is floating, which can reduce the capacitive load of the data line 61 . During fingerprint detection, the switch 91 is turned on to connect the bottom gate line 81 to the bottom gate bias voltage V-BG, so the threshold voltage (Vth) of the reset transistor T1 can be adjusted by the bottom gate bias voltage V-BG , to avoid leakage of reset transistor T1 during the exposure time. In one embodiment, the switch 91 can also be omitted. For example, if the capacitive load is within an acceptable range, the switch 91 can be omitted.

FIG. 10 shows the operation timing diagram of the fingerprint pixel unit 21 of FIG. 5(B) according to the present invention. The fingerprint display device of this embodiment includes the functions of display, touch and fingerprint. In FIG. 10, DISP represents display, TP represents touch, FP represents fingerprint sensing, and Vb represents vertical blanking. As shown in FIG. 10, in case 1, during display and touch, the switch signal is SW-BG is maintained at a low level to turn off the switch 91, so as to maintain the bottom gate line 81 as a floating connection, reducing the load of the data line 61, and during the fingerprint detection period, the switch signal SW-BG is switched to high level, so as to bias the bottom gate line 81 to the bottom gate bias voltage V-BG, so as to adjust the threshold voltage (Vth) of the reset transistor T1. In case 2, it is the same as the driving of case 1, but for a period of time such as the vertical blanking (Vb) interval, the level of the bottom gate line 81 is updated to the bottom gate bias voltage V-BG to avoid Potential drift and charge accumulation caused by the bottom gate line 81 floating for a long time. In case 3, it is the same as the driving in case 2, but the switch signal SW-BG is switched to a high level during touch to turn on the switch 91, wherein the bottom gate bias voltage V-BG is related to the touch sensing. The full driving signal with the same driving signal, that is, the voltage swing, phase and frequency of the full driving signal are approximately the same as the signal driving the touch sensing electrodes, thereby reducing the load on the touch sensing electrodes.

FIG. 11(A) shows a circuit diagram of the fingerprint pixel unit 23 of the i-th pixel row among the n pixel rows according to another embodiment of the present invention. The constituent elements of the fingerprint pixel unit 23 are the same as those in FIG. 5 ( A) fingerprint pixel unit 21, but adding a reset switch transistor SW-RST. As shown in the figure, the optical sensing element PS has a first terminal e1 and a second terminal e2 connected to a bias voltage Vbias; the capacitor C has both ends connected to the first terminal e1 and the second terminal e1 of the optical sensing element PS, respectively Terminal e2, the capacitor C can be a capacitor structure formed by the internal components of the optical sensing element PS; 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 connected to the ith reset and selection multiplexed line G-comb(i) among the n reset and selection multiplexed lines G-comb; reset the switching 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 line G-RST, wherein the reset transistor T1 and the reset The switching transistor SW-RST is connected in series between the first voltage VDD1 and the first end e1 of the optical sensing element PS through the respective connecting terminals; the driving transistor T2 has a control terminal (G) connected to the optical sensing element PS The first terminal e1, a first connection terminal (D) are 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 The selection transistor T3 has a control terminal (G) as the selection terminal SEL' and is connected to the i-1th reset and selection multiplexing line G- of the n reset and selection multiplexing lines comb(i-1), a first connection terminal (D) is connected to the second connection terminal (S) of the driving transistor T2, and a second connection terminal (S) is used as the readout terminal RO' and is 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 two connection terminals (D, S) thereof are respectively connected to the readout line RO and the sixth voltage VSS. Specifically, the second connection terminal (S) of the reset transistor T1 is connected to the first terminal e1 of the optical sensing element PS, and the first connection terminal (D) of the reset transistor T1 is connected to the reset switching transistor SW- The second connection terminal (S) of RST and the first connection terminal (D) of the reset switching transistor SW-RST are connected to the first voltage VDD1.

FIG. 11(B) shows another circuit diagram of the fingerprint pixel unit 23 of the i-th pixel row among the n pixel rows according to another embodiment of the present invention. The constituent elements of the fingerprint pixel unit 23 are the same as those in FIG. 5 . (B) The fingerprint pixel unit 21, but adding a reset switch transistor SW-RST. As shown in the figure, the optical sensing 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 reset and selection multiplexing lines G-comb. Set and select the multiplexing line G-comb(i-1); the capacitor C has both ends connected to the first end e1 and the second end e2 of the optical sensing element PS, and the capacitor C can be an internal element of the optical sensing element PS. The formed capacitor structure, but not limited thereto; the reset transistor T1 has a first connection terminal (D), a second connection terminal (S), and a control terminal (G) as the reset terminal RST' and is connected to the ith reset and selection multiplexing line G-comb(i) in the n reset and selection multiplexing lines G-comb; the reset switching transistor SW-RST has a control terminal (G) Connected to a reset switch control trace G-RST, a first connection terminal (D), and a second connection terminal (S), wherein the reset transistor T1 and the reset switch transistor SW-RST pass through their respective The connection terminal of the SVSS is connected in series between the third voltage SVSS and the first terminal e1 of the optical sensing element PS; the driving transistor T2 has a control terminal (G) connected to the first terminal e1 of the optical sensing element PS, a first connection The terminal (D) is connected to the fourth voltage SVDD, and a second connection terminal (S) is used as the readout terminal RO' and is connected to the readout line RO; in addition, the control terminal (G) of the load transistor T4 is connected to the fifth voltage VB, the first connection terminal (D) of which is connected to the readout line RO. Specifically, the second connection terminal (S) of the reset transistor T1 is connected to the first terminal e1 of the optical sensing element PS, and the first connection terminal (D) of the reset transistor T1 is connected to the reset switching transistor SW- The second connection terminal (S) of RST and the first connection terminal (D) of the reset switching transistor SW-RST are connected to the third voltage SVSS.

12 shows a schematic diagram of the fingerprint pixel unit 23 of FIG. 11(A) integrated into the display pixel unit 41 of the present invention, which shows that the display pixel unit 41 including three sub-pixels of RGB of the LCD integrates a fingerprint pixel unit 23 , wherein the circuit area of the fingerprint pixel unit 23 is arranged in the lower area of the three sub-pixels of RGB, but this is only an example and not a limitation. It is conceivable that the circuit area of the fingerprint pixel unit 23 can also be centrally arranged in The area below a particular subpixel. In addition, the present embodiment takes an LCD panel as an example, but the present invention is not limited thereto. 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, taking the LTPS LCD process as an example, the display scan line G-disp and the reset and selection multiplexing line G-comb can be made of metal layer 1 (metal-1, M1). The data lines 61 connecting the three sub-pixels of RGB can be made of metal layer 2 (metal-2, M2), which are marked as R(M2), G(M2) and B(M2) in FIG. 6 . The function is to send display data to each display subpixel. In one embodiment, the reset and selection multiplexing line G-comb(i-1) can be transferred from M1 to other conductive layers, such as metal layer 0 (metal-0, M0), through vias 63, Then, the traces 65 of the metal layer 0 are connected to the circuit area of the fingerprint pixel unit 23 in the i-th column. In order not to affect the aperture ratio, the traces 65 of the metal layer 0 can be disposed below the data lines 61 and substantially overlap with the data lines 61 . In another embodiment, the above-mentioned conductive layer used for layer transfer may be metal layer 3 (metal-3, M3), and the wiring 65 is disposed above the data line 61 and substantially overlaps along the data line 61 stretch. The reset switch control line G-RST can also be made of metal layer 0 (metal-0, M0) or metal layer 3 (metal-3, M3), and is set to overlap with the data line 61, so it will not Set the switch to control the trace G-RST to affect the aperture ratio. In addition, the integration of the fingerprint pixel unit 23 into the display pixel unit 41 of FIG. 11(B) of the present invention is also similar to the above-mentioned FIG. 12 , so it will not be repeated.

13 shows a schematic circuit diagram of the reset switch control line G-RST in the display area 71 of the panel 31 and its periphery, wherein the reset switch control line G-RST is connected to the reset voltage V-RST via the first switch SW1. For the convenience of control, each first switch SW1 can 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 determined by the reset switch control signal V-SW-RST in FIG. 3 Provided by the integrated integrated circuit 39 . Since the reset switch control line G-RST overlaps with the data line, when the RC load is large, the first switch SW1 should be used to avoid the influence of the load, that is, the first switch SW1 should be used in the display area. Turn off, so that the reset switch control line G-RST becomes floating, when the fingerprint detection is activated, the first switch SW1 is turned on; and when the RC load is within the acceptable range, the voltage can be directly connected It is applied to the reset switch control trace G-RST without setting the first switch SW1.

The operation of display and fingerprint sensing performed by the fingerprint pixel unit 23 of FIG. 11(A) or FIG. 11(B) is similar to that of the fingerprint pixel unit 21 of FIG. 5(A) or 5(B), but can be further The reset switch transistor SW-RST is turned on or off by using the integrated integrated circuit 39 of FIG. 3 through the reset switch control line G-RST, so as to further adjust the exposure time. Wherein, when the reset switch transistor SW-RST is turned on so that the fingerprint pixel unit 23 does not have the reset switch transistor SW-RST, the reset and selection multiplexing line G-comb(i-1) is turned on (ie, The selection terminal SEL' is turned on), and then the reset and selection multiplexing line G-comb(i) is turned on (that is, the reset terminal RST' is turned on), when the reset switch controls the line G-RST to disconnect the reset switch. When the switching transistor SW-RST is set, the reset transistor T1 is disabled to discharge the capacitor C. Since the added reset switching transistor SW-RST can determine whether the storage capacitor C is reset, the exposure time can be adjusted.

It can be seen from the above description that the reset line RST and the selection line SEL of the optical fingerprint sensor are the main reasons for the reduction of the aperture ratio of the in-cell fingerprint display panel. In the method, by integrating the reset line and the selection line into a reset and selection multiplexing line, the above-mentioned panel aperture ratio can be effectively improved, and the effect of fingerprint sensing can be achieved at the same time.

The above-mentioned embodiments are only examples for convenience of description, and the scope of the claims claimed in the present invention should be based on the scope of the patent application, rather than being limited to the above-mentioned embodiments.

11: Fingerprint sensor 12: Thin film transistor layer 13: Filter substrate layer 14: Reflective layer 15: Glass substrate 21, 23: Fingerprint pixel unit T1: Reset transistor T2: drive transistor T3: select transistor T4: Load transistor PS: Optical sensing element C: Capacitor 31: Panel 311: Display area 33: Display-driven GOA circuit 39: Integrate integrated circuits 35: Fingerprint Sensing Driven GOA Circuit 37: Pixel Column 41: Display pixel unit 61: Data line 65: line 81: Bottom gate line 91: switch RST: reset line RST': reset terminal SEL: select line SEL’: selection terminal RO: readout line RO’, RO”: read terminal G-disp: Display scan lines G-comb: reset and select multiplexer G-RST: Reset switch control trace G: control terminal D, S: connection end e1: the first end e2: the second end VDD1, VDD2, VB, VSS, SVSS, SVDD, Vbias: Voltage

FIG. 1 shows a schematic diagram of integrating an optical fingerprint sensor and a liquid crystal display panel. FIG. 2(A) shows a circuit diagram of an optical fingerprint pixel unit. FIG. 2(B) shows a circuit diagram of another optical fingerprint pixel unit. FIG. 3 shows a system architecture diagram of the fingerprint display device of the present invention. FIG. 4 schematically shows pixel columns such as the i-1 th column, the i th column, and the i+1 th column in the fingerprint display device of the present invention. FIG. 5(A) shows a circuit diagram of the fingerprint pixel unit of the i-th pixel row according to an embodiment of the present invention. FIG. 5(B) shows another circuit diagram of the fingerprint pixel unit of the i-th pixel row according to an embodiment of the present invention. FIG. 6 is a schematic diagram showing the integration of the fingerprint pixel unit of FIG. 5(A) into the display pixel unit of the present invention. FIG. 7(A) shows an operation timing diagram of the fingerprint display device using the fingerprint pixel unit of FIG. 5(A) of the present invention. FIG. 7(B) shows another operation timing diagram of the fingerprint display device using the fingerprint pixel unit of FIG. 5(A) of the present invention. FIG. 8 is a schematic diagram showing the integration of the fingerprint pixel unit of FIG. 5(B) into the display pixel unit of the present invention. FIG. 9 shows a schematic diagram of the routing of the bottom gate line of the reset transistor on the panel. FIG. 10 shows an operation timing diagram of the present invention using the fingerprint pixel unit of FIG. 5(B). FIG. 11(A) shows a circuit diagram of the fingerprint pixel unit of the i-th pixel row according to another embodiment of the present invention. FIG. 11(B) shows another circuit diagram of the fingerprint pixel unit of the i-th pixel column according to another embodiment of the present invention. FIG. 12 is a schematic diagram showing the integration of the fingerprint pixel unit of FIG. 11(A) into the display pixel unit of the present invention. FIG. 13 shows a circuit diagram of the reset switch control wiring in the display area of the panel and its periphery according to the present invention.

37: Pixel Column

41: Display pixel unit

21: Fingerprint pixel unit

G-disp: Display scan lines

G-comb: reset and select multiplexer

RST': reset terminal

SEL’: selection terminal

RO': read terminal

Claims (29)

A fingerprint display device has a plurality of pixel rows, each of the n pixel rows in the plurality of pixel rows has a plurality of display pixel units and a plurality of fingerprint pixel units, and n is an integer greater than 1 , the n pixel rows are driven by corresponding n display scan lines and n reset and selection multiplexing lines for display and fingerprint sensing, wherein each fingerprint pixel unit has a reset terminal and a selection terminal, the reset terminal of the fingerprint pixel unit of the i-th pixel row in the n pixel rows is connected to the i-th reset and selection multiplexed line among the n reset and selection multiplexed lines , the selection end of the fingerprint pixel unit of the i-th pixel row in the n pixel rows is connected to the i-1-th reset and selection multiplexing line among the n reset and selection multiplexing lines, wherein i is any integer between 1 and n. The fingerprint display device according to claim 1, wherein the fingerprint pixel unit of the i-th pixel row in the n pixel rows comprises: a reset transistor, which has a control terminal as the reset terminal and is connected to the i-th reset and selection multiplexed line among the n reset and selection multiplexed lines, and a first connection terminal is connected to a first a 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, which has a control terminal as the selection terminal and is connected to the i-1 th reset and selection multiplexing line among the n reset and selection multiplexing lines, and a first connection terminal is connected to the driving a second connection end of the transistor, and a second connection end; an optical sensing element having a second connection terminal and a bias voltage whose two ends are respectively connected to the reset transistor; and A capacitor has two ends respectively connected to the control terminal of the driving transistor and the bias voltage. The fingerprint display device according to claim 2, wherein the second connection end of the selection transistor is used as a readout end and is connected to a readout line, and the readout end of the fingerprint pixel units in the same row is connected to a load The transistors share the load transistor, and 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. The fingerprint display device of claim 2, wherein the reset and selection multiplexing lines are driven in sequence, and when the i-1 th reset and selection multiplexing lines of the n reset and selection multiplexed lines are driven When using the line, turn on the selection transistor of the fingerprint pixel unit of the i-th pixel row in the n pixel rows to read out the fingerprint signal, and then drive the i-th one of the n reset and selection multiplexed lines The reset and selection multiplexing line is used to turn on the reset transistor of the fingerprint pixel unit of the i-th pixel column in the n pixel columns to reset the level of the capacitor. The fingerprint display device of claim 2, wherein the plurality of pixel units are disposed on a panel, and an integrated integrated circuit controls a display-driving GOA circuit to sequentially drive the display scan lines for display, and control a GOA circuit driven by fingerprint sensing to sequentially drive the reset and selection multiplexing lines for fingerprint sensing, wherein the sensed fingerprint data is read out from the readout line to the integrated integrated circuit to Perform fingerprint identification. The fingerprint display device of claim 5, wherein the panel senses the touch of the user's finger and transmits the touch signal to the integrated integrated circuit to provide a touch sensing function. The fingerprint display device according to claim 2, wherein the display scan line and the reset and selection multiplexing line are made of metal layer 1, and the data line connecting the sub-pixels of the display pixel unit is made of metal layer 2. Fabrication, the i-1th reset and selection multiplexing line among the n reset and selection multiplexing lines is transferred from metal layer 1 to metal layer 0 or metal layer 3 through a through hole, and then from the metal layer The traces of metal layer 0 or metal layer 3 are connected to the fingerprint pixel unit in the i-th row of the n pixel columns, wherein the traces of metal layer 0 or metal layer 3 are arranged to substantially overlap with the data lines. The fingerprint display device according to claim 6, wherein when the fingerprint detection is not activated, display driving and touch sensing are performed on the panel in a time-sharing manner, and when the display driving is performed, the reset and selection are performed. The multiplexed line is set to high impedance. When performing touch sensing, the full drive signal that is the same as the touch sensing driving signal is sent to the reset and selection multiplexing line; when performing fingerprint detection, the multiplexing line is driven in sequence. Set and select multiplexed lines. The fingerprint display device of claim 8, wherein the reset and selection multiplexing line is connected to a DC bias voltage for a period of time between the vertical blanking intervals. The fingerprint display device according to claim 1, wherein the fingerprint pixel unit of the i-th pixel row in the n pixel rows comprises: a reset transistor, which has a control terminal as the reset terminal and is connected to the i-th reset and selection multiplexed line among the n reset and selection multiplexed lines, and a first connection terminal is connected to a first three voltages, 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 a second connection end of the reset transistor, and a second end serving as a selection end and connected to the i-1th of the n reset and selection multiplexing lines reset and select multiplex lines; and A capacitor has two ends respectively connected to the control end of the driving transistor and the second end of the optical sensing element. The fingerprint display device of claim 10, wherein the reset transistor is connected to a bottom gate. The fingerprint display device according to claim 10, wherein the second connection end of the driving transistor is used as a readout end and is connected to a readout line, and the readout end of the fingerprint pixel units in the same row is connected to a load The transistors share the load transistor, and 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. The fingerprint display device of claim 10, wherein the reset and selection multiplexed lines are driven sequentially, and when the i-1 th reset and selection multiplexed lines of the n reset and selection multiplexed lines are driven When the line is used, power is supplied to the optical sensing element of the fingerprint pixel unit of the i-th pixel row in the n pixel rows to increase the voltage level of the selection terminal, and then the driving transistor is turned on to read out the fingerprint signal, and then Driving the ith reset and select multiplexed line among the n reset and select multiplexed lines to turn on the reset transistor of the fingerprint pixel unit of the ith pixel column of the n pixel columns to reset Set the level of this capacitor. The fingerprint display device of claim 10, wherein the plurality of pixel units are disposed on a panel, and an integrated integrated circuit controls a display-driven GOA circuit to sequentially drive the display scan lines for display, and control a GOA circuit driven by fingerprint sensing to sequentially drive the reset and selection multiplexing lines for fingerprint sensing, wherein the sensed fingerprint data is read out from the readout line to the integrated integrated circuit to Perform fingerprint identification. The fingerprint display device of claim 14, wherein the panel senses the touch of the user's finger and transmits the touch signal to the integrated integrated circuit to provide a touch sensing function. The fingerprint display device of claim 11, wherein the display scan line and the reset and selection multiplexing line are made of metal layer 1, and the data line connecting the sub-pixels of the display pixel unit is made of metal layer 2. Fabrication, the i-1th reset and selection multiplexing line among the n reset and selection multiplexing lines is transferred from metal layer 1 to metal layer 0 or metal layer 3 through a through hole, and then from the metal layer The wiring of metal layer 0 or metal layer 3 is connected to the fingerprint pixel unit of the i-th pixel row in the n pixel columns, wherein the wiring of metal layer 0 or metal layer 3 is arranged to be substantially the same as the data line Overlapping, the bottom gate line connecting the bottom gate connected to the reset transistor is made of metal layer 0 or metal layer 3, and is arranged to substantially overlap with the data line. The fingerprint display device of claim 16, wherein the bottom gate line is connected to a bottom gate bias voltage via a switch, and during writing of display data, the switch is turned off so that the bottom gate line is Floating, during a fingerprint detection period, the switch is turned on so that the bottom gate line is connected to the bottom gate bias voltage. The fingerprint display device of claim 17, wherein during a period of time in the vertical blanking interval, the level of the bottom gate line is updated to the bottom gate bias voltage. The fingerprint display device of claim 17, wherein, during a touch period, the switch is turned on and the bottom gate bias voltage is the same full drive signal as the touch sensing drive signal. The fingerprint display device according to claim 1, wherein the fingerprint pixel unit of the i-th pixel row in the n pixel rows comprises: an optical sensing element having a first end and a second end connected to a bias voltage; a capacitor with two ends respectively connected to the first end and the second end of the optical sensing element; a reset transistor having a control terminal as the reset terminal and connected to the i-th reset and selection multiplexed line among the n reset and selection multiplexed lines, a first connection terminal, and a first two connection terminals; A reset switch transistor has a control terminal connected to a reset switch control wire, a first connection terminal, and a second connection terminal, wherein the reset transistor and the reset switch transistor are connected in series with between a first voltage and the first end of the optical sensing element; a driving transistor having a control end connected to the first end of the optical sensing element, a first connection end connected to a second voltage, and a second connection end; and a selection transistor, which has a control terminal as the selection terminal and is connected to the i-1 th reset and selection multiplexing line among the n reset and selection multiplexing lines, and a first connection terminal is connected to the driving The second connection end of the transistor T2, and a second connection end. The fingerprint display device of claim 20, wherein the second connection end of the selection transistor is used as a readout end and is connected to a readout line, and the readout end of the fingerprint pixel units in the same row is connected to a load The transistors share the load transistor, and 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. The fingerprint display device of claim 20, wherein the second connection end of the reset transistor is connected to the first end of the optical sensing element, and the first connection end of the reset transistor is connected to the reset switch The second connection terminal of the transistor, the first connection terminal of the reset switch transistor is connected to the first voltage. The fingerprint display device of claim 20, wherein the reset switch transistor system is controlled by a reset switch control line to determine whether the capacitor is reset to adjust the exposure time. The fingerprint display device according to claim 1, wherein the fingerprint pixel unit of the i-th pixel row in the n pixel rows comprises: an optical sensing element, which has a first end and a second end as selection ends and is connected to the i-1 th reset and selection multiplexed line among the n reset and selection multiplexed lines; a capacitor with two ends respectively connected to the first end and the second end of the optical sensing element; A reset transistor T1 has a control terminal as the reset terminal and is connected to the ith reset and selection multiplexed line among the n reset and selection multiplexed lines, a first connection terminal, and a the second connection end; A reset switch transistor has a control terminal connected to a reset switch control wire, a first connection terminal, and a second connection terminal, wherein the reset transistor and the reset switch transistor are connected in series with between a third voltage and the first end of the optical sensing element; and A driving transistor has a control end connected to the first end of the optical sensing element, a first connection end connected to a fourth voltage, and a second connection end. The fingerprint display device of claim 24, wherein the second connection end of the driving transistor is used as a readout end and is connected to a readout line, and the readout end of the fingerprint pixel units in the same row is connected to a load The transistors share the load transistor, and 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. The fingerprint display device of claim 24, wherein the second connection end of the reset transistor is connected to the first end of the optical sensing element, and the first connection end of the reset transistor is connected to the reset switch The second connection terminal of the transistor and the first connection terminal of the reset switch transistor are connected to the third voltage. The fingerprint display device of claim 24, wherein the reset switch transistor SW-RST is controlled by a reset switch control line to determine whether the capacitor is reset to adjust the exposure time. A driving method of a fingerprint display device, the fingerprint display device has a plurality of pixel columns, each pixel column of n pixel columns in the plurality of pixel columns 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 driven by at least corresponding n display scan lines and n reset and selection multiplexing lines for display and fingerprint sensing, each fingerprint pixel unit Having a reset terminal and a selection terminal, the method includes: The n reset and selection multiplexed lines are sequentially driven, wherein when the i-1 th reset and selection multiplexed line among the n reset and selection multiplexed lines is driven, the n pictures are activated The reset terminal of the fingerprint pixel unit of the i-1th pixel row in the pixel row and the selection terminal of the fingerprint pixel unit of the i-th pixel row of the n pixel rows, where i is between 1 Any integer up to n. An integrated integrated circuit for controlling the fingerprint display device as described in claim 1, 2, 10, 20 or 24, to sequentially drive the display scan lines for display, and to sequentially drive the reset and selection reset Use wire for fingerprint sensing.

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