Control circuit of in-cell optical fingerprint recognition display device and in-cell optical fingerprint recognition display device

Abstract

The application provides a control circuit of an embedded optical fingerprint recognition display device and an embedded optical fingerprint recognition display device. The control circuit of the embedded optical fingerprint recognition display device comprises a multitasking unit having a plurality of multitaskers, each multitasker having a first end, a second end and a third end, the first end being connected to a corresponding data line of the plurality of data lines; a display driving unit connected to the data lines not connected to the plurality of multitaskers and the second end of each multitasker; an optical fingerprint driving and sensing unit connected to the third end of each multitasker; and a control unit connected to the multitasking unit, so that the first end of each multitasker is connected to the second end and a display operation is provided through the plurality of data lines, or the first end of each multitasker is connected to the third end to provide a fingerprint recognition operation.

Description

[0001] This application is a divisional application of patent application No. CN201710636966.8 with a filing date of 31 July 2017, and with the title of "In-cell optical fingerprint recognition display device". TECHNICAL FIELD

[0002] The present application relates to the technical field of fingerprint recognition, and in particular to an in-cell optical fingerprint recognition display device. BACKGROUND

[0003] The competition in the mobile phone market is becoming increasingly fierce. Therefore, many functions have been added to the design of mobile phones, such as touch detection, fingerprint recognition, etc. At the same time, in order to reduce the thickness of the mobile phone and reduce the assembly process, the current mobile phone mainly uses in-cell touch detection technology. Figure 1 is a schematic diagram of a prior art mobile phone 100. As shown, it has a fingerprint recognition module 110 and a touch screen 120. Since the fingerprint recognition module 110 is placed on the front of the mobile phone, the area that can be displayed by the touch screen 120 of the mobile phone becomes smaller.

[0004] In the design of mobile phones, in order to display more information, the display screen of the mobile phone is towards high screen ratio. At the same time, in order to place the fingerprint recognition system or the camera on the front of the mobile phone, the touch screen 120 needs to be cut into a special shape to place the related components. Figure 2 is a schematic diagram of another prior art mobile phone 200. In order to accommodate the fingerprint recognition module 110, the display screen 220 of the mobile phone is cut into a special shape to hollow out an area in the display screen 220, as shown by the elliptical dashed line in Figure 2 However, when the display screen 220 is cut into a special shape, the related components of the display screen (such as the substrate, the light guide plate, the thin film transistor layer, …, the protective glass, etc.) need to be cut into a special shape, which increases many processing procedures, and also increases the difficulty of assembly, thereby greatly increasing the cost. Therefore, the current in-cell optical fingerprint recognition display device still has room for improvement. SUMMARY

[0005] The main purpose of the present application is to provide an in-cell optical fingerprint recognition display device control circuit and an in-cell optical fingerprint recognition display device that can have display, fingerprint recognition and other functions on the same panel.

[0006] According to a feature of the present application, an in-cell optical fingerprint recognition display device control circuit is provided, wherein the in-cell optical fingerprint recognition display device has a plurality of scanning lines and a plurality of data lines arranged according to a first direction and a second direction, and the control circuit comprises:

[0007] A multi-task unit has a plurality of multi-taskers, each of which has a first end, a second end, and a third end, the first end is connected to a corresponding data line of the plurality of data lines;

[0008] A display driving unit is connected to the data lines not connected to the plurality of multi-taskers and the second end of each of the plurality of multi-taskers.

[0009] An optical fingerprint driving and sensing unit is connected to the third end of each of the plurality of multi-taskers; and

[0010] A control unit is connected to the multi-task unit to make the first end of each of the plurality of multi-taskers connect to the second end and provide a display operation via the plurality of data lines, or make the first end of each of the plurality of multi-taskers connect to the third end, couple the optical fingerprint driving and sensing unit to at least one light sensing circuit in the in-cell optical fingerprint recognition display device, and provide a fingerprint recognition operation via the data lines connected to the plurality of multi-taskers.

[0011] Each of the plurality of multi-taskers has a plurality of pixel circuits or a plurality of light sensing circuits, and the plurality of pixel circuits and the plurality of light sensing circuits are located in the same layer.

[0012] The display operation is to write display data to corresponding pixel circuits via the multi-task unit, the plurality of data lines connected to the plurality of multi-taskers, and the plurality of data lines not connected to the plurality of multi-taskers.

[0013] The fingerprint recognition operation is to write an initial voltage to corresponding light sensing circuits via the multi-task unit and the plurality of data lines connected to the plurality of multi-taskers, or read the sensing voltage of corresponding light sensing circuits via the multi-task unit and the plurality of data lines connected to the plurality of multi-taskers.

[0014] The optical fingerprint driving and sensing unit includes a fingerprint sensing signal detection circuit, the fingerprint sensing signal detection circuit includes a switch, a capacitor, and an operational amplifier, one end of the switch is connected to the second end of the multi-tasker, one end of the capacitor, and the inverting input terminal of the operational amplifier, the other end of the switch is connected to the other end of the capacitor and the output terminal of the operational amplifier, the control terminal of the switch is connected to a reset signal generated by the control unit, and the non-inverting input terminal of the operational amplifier is connected to a reference voltage.

[0015] The in-cell optical fingerprint recognition display device further has a plurality of transparent sensing electrode blocks arranged according to the first and second directions.

[0016] The control circuit of the in-cell optical fingerprint recognition display device further comprises:

[0017] A common electrode and a touch sensing unit are connected to the plurality of transparent sensing electrode blocks, so that the plurality of transparent sensing electrode blocks perform self-capacitance touch detection or the plurality of transparent sensing electrode blocks provide a common voltage for display operation.

[0018] According to another feature of the present application, an in-cell optical fingerprint recognition display device is provided, comprising:

[0019] At least one light source;

[0020] A light guide plate for guiding the direction of light from the at least one light source;

[0021] A thin film transistor layer located on one side of the light guide plate, having a plurality of pixel circuits, a plurality of light sensing circuits, a plurality of scan lines and a plurality of data lines, the plurality of scan lines being arranged according to a first direction, and the plurality of data lines being arranged according to a second direction;

[0022] A touch sensing and sharing electrode layer located on the side of the thin film transistor layer opposite to the light guide plate, having a plurality of transparent sensing electrode blocks, the plurality of transparent sensing electrode blocks being arranged according to the first direction and the second direction; and

[0023] A light collimator located at a position corresponding to the side of the plurality of light sensing circuits opposite to the light guide plate,

[0024] Wherein the plurality of light sensing circuits receive reflected light from the at least one light source to generate an optical fingerprint image, and the light collimator helps the reflected light to travel in parallel,

[0025] Wherein each scan line and each data line intersection is provided with a pixel circuit or a light sensing circuit, and the plurality of pixel circuits and the plurality of light sensing circuits are located in the same layer of the thin film transistor layer to form non-overlapping fingerprint sensing areas and non-fingerprint sensing areas on the thin film transistor layer; the plurality of pixel circuits and the plurality of light sensing circuits in the same column transmit display data and optical image data through the same data line.

[0026] The in-cell optical fingerprint recognition display device further comprises:

[0027] A reflection plate located on the side of the light guide plate opposite to the thin film transistor layer to reflect part of the light output from the light guide plate;

[0028] A diffusion plate located on the side of the light guide plate facing the thin film transistor layer;

[0029] a back brightness enhancement film located on a side of the diffusion plate facing the thin film transistor layer; and a front brightness enhancement film located on a side of the back brightness enhancement film facing the thin film transistor layer.

[0030] An in-cell optical fingerprint recognition display device further includes:

[0031] a cover plate;

[0032] a light shielding layer located on the same side of the cover plate relative to the thin film transistor layer, the light shielding layer having a plurality of light shielding lines; and

[0033] a color filter layer located between the plurality of light shielding lines of the light shielding layer and surfaces of the plurality of light shielding lines.

[0034] wherein the pixel circuit includes a thin film transistor and a capacitor, and the photosensitive circuit includes a thin film transistor, a capacitor, and a photosensitive diode.

[0035] An in-cell optical fingerprint recognition display device further includes:

[0036] a fingerprint and scanning driving circuit connected to the plurality of scanning lines to sequentially or randomly turn on the pixel circuit or the photosensitive circuit corresponding to a scanning line of the plurality of scanning lines; and

[0037] a display, touch, and optical fingerprint control circuit connected to the fingerprint and scanning driving circuit and the plurality of data lines.

[0038] wherein the display, touch, and optical fingerprint control circuit includes:

[0039] a multi-tasking unit having a plurality of multi-taskers, each multi-tasker having a first end, a second end, and a third end, the first end connected to a corresponding data line of the plurality of data lines;

[0040] a display driving unit connected to the second end of each multi-tasker to write display data to the corresponding pixel circuit via the multi-tasking unit and the plurality of data lines; and

[0041] an optical fingerprint driving and sensing unit connected to the third end of each multi-tasker to write an initial voltage to the corresponding photosensitive circuit via the multi-tasking unit and the plurality of data lines, or to read a sensing voltage of the corresponding photosensitive circuit via the multi-tasking unit and the plurality of data lines.

[0042] wherein the display, touch, and optical fingerprint control circuit further includes:

[0043] a shared electrode and touch sensing unit connected to the plurality of transparent sensing electrode blocks of the touch sensing and shared electrode layer to enable self-capacitance touch detection by the plurality of transparent sensing electrode blocks or to provide a common voltage by the plurality of transparent sensing electrode blocks for display operation; and

[0044] a control unit connected to the multi-task unit, the display driving unit, the optical fingerprint driving and sensing unit, the shared electrode and touch sensing unit, and the fingerprint and scanning driving circuit to provide timing and control signals for display operation, touch detection operation, or fingerprint recognition operation.

[0045] wherein a priority of the touch detection operation is higher than a priority of the display operation and a priority of the fingerprint recognition operation, and the priority of the display operation is the same as the priority of the fingerprint recognition operation.

[0046] wherein the thin film transistor layer further comprises:

[0047] a plurality of fingerprint data lines arranged according to the second direction,

[0048] wherein each of the plurality of scanning lines and each of the plurality of data lines is provided with a pixel circuit at an intersection thereof, and each of the plurality of fingerprint scanning lines and each of the plurality of fingerprint data lines is provided with a photosensitive circuit at an intersection thereof.

[0049] wherein the thin film transistor layer further comprises:

[0050] a plurality of fingerprint scanning lines arranged according to the first direction; and

[0051] a plurality of fingerprint data lines arranged according to the second direction,

[0052] wherein each of the plurality of scanning lines and each of the plurality of data lines is provided with a pixel circuit at an intersection thereof, and each of the plurality of fingerprint scanning lines and each of the plurality of fingerprint data lines is provided with a photosensitive circuit at an intersection thereof.

[0053] wherein the light collimator comprises a polarizer having light focusing microstructures.

[0054] wherein the light collimator is located in a light shielding layer, the light shielding layer is located on a side of a cover plate facing the thin film transistor layer, the light shielding layer is composed of a plurality of light shielding lines, and the light collimator and the plurality of light shielding lines are manufactured using the same mask.

[0055] wherein the light collimator is located in a color filter layer, and the light collimator and the color filter layer are manufactured using the same mask.

[0056] The light collimator is composed of a plurality of liquid crystal pixels located at corresponding positions of the plurality of light sensing circuits.

[0057] The at least one light source is a cold cathode fluorescent tube light source, a hot cathode fluorescent tube light source, or a light emitting diode light source.

[0058] The at least one light source further includes an infrared or visible light source.

[0059] The present application can provide a same panel with display, fingerprint recognition, and other functions. Since the panel does not need to be cut into a special shape, the yield and cost of the panel can be reduced. Meanwhile, the fingerprint recognition component does not need to be prepared additionally, so the cost can be reduced and the material management can be simplified. Since the fingerprint recognition function can be integrated into the panel without cutting the panel into a special shape, the component does not need to be drilled, so the waterproofness of the terminal product, such as a mobile phone, can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0060] Figure 1 is a schematic diagram of a prior art mobile phone.

[0061] Figure 2 is a schematic diagram of another prior art mobile phone.

[0062] Figure 3 is a schematic diagram of a cross section of an in-cell optical fingerprint recognition display device of the present application.

[0063] Figure 4 is a schematic diagram of a thin film transistor layer, a fingerprint and scan driving circuit, and a display, touch, and optical fingerprint control circuit of an embodiment of the present application.

[0064] Figure 5 is a block diagram of a display, touch, and optical fingerprint control circuit of the present application.

[0065] Figure 6 is a schematic diagram of a light sensing circuit, a multiplexer, and a fingerprint sensing signal detection circuit of the present application.

[0066] Figure 7 is a timing diagram of a light sensing circuit, a multiplexer, and a fingerprint sensing signal detection circuit of the present application.

[0067] Figure 8 is a schematic diagram of a thin film transistor layer, a fingerprint and scan driving circuit, and a display, touch, and optical fingerprint control circuit of another embodiment of the present application.

[0068] Figure 9 is a block diagram of a display, touch, and optical fingerprint control circuit of the present application. Figure 8

[0069] Figure 10 ​Fig. 6 is another embodiment schematic diagram of the thin film transistor layer, the fingerprint and scanning driving circuit, and the display, touch and optical fingerprint control circuit of the present application.

[0070] Figure 11 Fig. 7 is a schematic diagram of the light guide plate of the present application. Figure 10 Fig. 8 is a corresponding timing diagram.

[0071] Figure 12 Fig. 9 is a schematic diagram of the light guide plate of the present application.

[0072] Figure 13 Fig. 10 is a schematic diagram of the light collimator of the present application.

[0073] Figure 14 Fig. 11 is another schematic diagram of the light collimator of the present application.

[0074] Figure 15 Fig. 12 is yet another schematic diagram of the light collimator of the present application.

[0075] Figure 16 Fig. 13 is still another schematic diagram of the light collimator of the present application.

[0076] Figure 17 Fig. 14 is a schematic diagram of the use of the embedded optical fingerprint recognition display device of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0078] Mobile phone 100 Fingerprint recognition module 110

[0079] Touch screen 120 Mobile phone 200

[0080] Mobile phone display screen 220 Embedded optical fingerprint recognition display device 300

[0081] Support layer 305 Reflective plate 310

[0082] Light source 315 Light guide plate 320

[0083] Diffusion plate 325 Backside brightness enhancement film 330

[0084] Frontside brightness enhancement film 335 Lower polarizing layer 340

[0085] Thin film transistor layer 345 Display material layer 350

[0086] Touch sensing and shared electrode layer 355 Color filter layer 360

[0087] Light shielding layer 365 Cover plate 370

[0088] Light collimator 375 Light shielding line 3651

[0089] Sensing electrode block 3551 Photosensitive circuit 440

[0090] Fingerprint and scanning driving circuit 410 display, touch and optical fingerprint control circuit 420

[0091] Pixel circuit 430 data line 460

[0092] Scan line 450, 451, 453 thin film transistor 431, 441

[0093] Capacitor 433, 443 photodiode 445

[0094] Multi-task unit 510 display driving unit 520

[0095] Optical fingerprint driving and sensing unit 530 shared electrode and touch sensing unit 540

[0096] Control unit 550 multi-tasker 511

[0097] First end a second end b

[0098] Third end c initial voltage Vini

[0099] Common voltage Vcom fingerprint sensing signal detection circuit 531

[0100] Switch 610 capacitor 620

[0101] Operational amplifier 630 reset signal Reset

[0102] Scan signal Scan voltage Vc of capacitor 443

[0103] Fingerprint data line 810 fingerprint scan line 1010

[0104] Fingerprint data line 1020 fingerprint driving circuit 1040

[0105] Scan driving circuit 1030 period T1-T7

[0106] Line segment BB' polarizer 1310

[0107] Light focusing microstructure 1311 region A DETAILED DESCRIPTION

[0108] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0109] Figure 3is a cross-sectional view of the embedded optical fingerprint recognition display device 300 of the present application. The embedded optical fingerprint recognition display device 300 includes a support layer (Bezel) 305, a reflector 310, at least one light source 315, a light guide plate 320, a diffuser 325, a rear bright enhancement film (RBEF) 330, a front bright enhancement film (FBEF) 335, a lower polarizer 340, a thin film transistor layer 345, a display material layer 350, a touch sensing and common electrode layer 355, a color filter (CF) 360, a black matrix (BM) 365, a cover plate 370, and a collimator 375.

[0110] The at least one light source 315 is located at a side of the light guide plate 320 to provide light. The light guide plate 320 guides the light direction of the at least one light source 315.

[0111] The reflector 310 is located on the support layer 305 and at a side of the light guide plate 320 opposite to the thin film transistor layer 345 to reflect the light leaked from the light guide plate 320 back into the light guide plate 320, preventing the light of the at least one light source 315 from leaking out. The diffuser 325 is located at a side of the light guide plate 320 facing the thin film transistor layer 345 to form a uniform area light source from the light outputted by the light guide plate 320.

[0112] The rear bright enhancement film 330 is located at a side of the diffuser 325 facing the thin film transistor layer 345 to brighten the area light source outputted by the diffuser 325. The front bright enhancement film 335 is located at a side of the rear bright enhancement film 330 facing the thin film transistor layer 345 to brighten the area light source outputted by the diffuser 325.

[0113] The lower polarizer 340 is located at a side of the front bright enhancement film 335 facing the thin film transistor layer 345 to convert the non-polarized area light source outputted by the front bright enhancement film 335 into a polarized area light source.

[0114] The thin film transistor layer 345 is located at a side of the light guide plate 320 and has a plurality of pixel circuits, a plurality of photosensitive circuits, a plurality of scanning lines, and a plurality of data lines (shown in Figure 4 ). The plurality of photosensitive circuits receives the reflected light of the at least one light source 315 to generate an optical fingerprint image.

[0115] The display material layer 350 is located on the side of the thin film transistor layer 345 opposite to the light guide plate 320. The material of the display material layer 350 can be liquid crystal.

[0116] The touch sensing and sharing electrode layer 355 is located on the side of the thin film transistor layer 345 opposite to the light guide plate 320, and has a plurality of touch sensing electrode blocks 3551 arranged according to the first direction and the second direction. The touch sensing electrode blocks 3551 can be transparent or near-transparent material and can be used for touch detection.

[0117] The light shielding layer 365 is located on the side of the cover plate 370 facing the thin film transistor layer 345, and has a plurality of light shielding lines 3651. The plurality of light shielding lines 3651 are arranged in a matrix manner, which is known to those skilled in the art of liquid crystal display devices, and will not be described in detail. The color filter layer 360 is located between the plurality of light shielding lines 3651 of the light shielding layer 365 and the surface of the plurality of light shielding lines 3651.

[0118] The light collimator 375 is located at the corresponding position of the side of the plurality of light sensing circuits opposite to the light guide plate 320 to assist the forward progress of the reflected light to be parallel and straight. The light collimator 375 is located on the light path of the reflected light to the plurality of light sensing circuits. The light collimator (Collimator) can be located in the thin film transistor layer 345, the light shielding layer (BM) 365, the color filter layer (CF) 360, or the display material layer 350.

[0119] The in-cell optical fingerprint recognition display device 300 further includes a fingerprint and scanning driving circuit 410 and a display, touch and optical fingerprint control circuit 420, and a thin film transistor layer 345, as shown in Figure 4 The thin film transistor layer 345 has a plurality of pixel circuits 430, a plurality of light sensing circuits 440, a plurality of scanning lines 450 arranged according to a first direction (Y-axis direction), and a plurality of data lines 460 arranged according to a second direction (X-axis direction).

[0120] Each intersection of a scanning line 450 and a data line 460 is provided with a pixel circuit 430 or a light sensing circuit 440. Each pixel circuit 430 includes a thin film transistor 431 and a capacitor 433, and each light sensing circuit 440 includes a thin film transistor 441, a capacitor 443 and a light sensing diode 445.

[0121] As shown in Figure 4As shown, the scan line 451 is connected to the thin film transistors 431 for simple display operation. The scan line 453 is connected to the thin film transistors 431 and the thin film transistors 441 for display operation and fingerprint recognition operation.

[0122] The fingerprint and scan driving circuit 410 is connected to the scan lines 450 to sequentially or randomly turn on the pixel circuits 430 or the light sensing circuits 440 corresponding to a scan line of the scan lines 450. The display, touch and optical fingerprint control circuit 420 is connected to the fingerprint and scan driving circuit 410 and the data lines 460. As shown, Figure 4 As shown, the light sensing circuits 440 are fabricated together with the pixel circuits 430, so the light sensing circuits 440 can be disposed in the display area.

[0123] Figure 5 is a block diagram of the display, touch and optical fingerprint control circuit 420 of the present application. As shown, Figure 5 The display, touch and optical fingerprint control circuit 420 includes a multi-task unit 510, a display driving unit 520, an optical fingerprint driving and sensing unit 530, a shared electrode and touch sensing unit 540, and a control unit 550.

[0124] The multi-task unit 510 has a plurality of multi-taskers 511, each of which has a first end a, a second end b, and a third end c. The first end a is connected to a corresponding data line 460 of the data lines. The display driving unit 520 is connected to the second end b of each multi-tasker 511 to write display data to the corresponding pixel circuit 430 via the multi-task unit 510 and the data lines 460.

[0125] The optical fingerprint driving and sensing unit 530 is connected to the third end c of each multi-tasker 511 to write an initial voltage Vini to the corresponding light sensing circuit 440 via the multi-task unit 510 and the data lines 460, or to read a sensing voltage from the corresponding light sensing circuit 440 via the multi-task unit 510 and the data lines 460.

[0126] The shared electrode and touch sensing unit 540 is connected to the transparent sensing electrode blocks 3551 of the touch sensing and shared electrode layer 355 to perform, for example, self-capacitance touch detection, or to provide a common voltage Vcom to the transparent sensing electrode blocks 3551 for display operation.

[0127] By cutting the touch sensing and shared electrode layer 355, the plurality of touch sensing electrode blocks 3551 can be formed. The plurality of touch sensing electrode blocks 3551 can be used for self-capacitance touch detection or for applying a common voltage to the plurality of transparent sensing electrode blocks 3551 during display operation to form a common voltage layer. These are well known to those skilled in the art based on the content of the present disclosure and are not described in detail.

[0128] The control unit 550 is connected to the multi-tasking unit 510, the display driving unit 520, the optical fingerprint driving and sensing unit 530, the shared electrode and touch sensing unit 540, and the fingerprint and scanning driving circuit 410 to provide timing and control signals for display operation, touch detection operation, or fingerprint recognition operation.

[0129] The optical fingerprint driving and sensing unit 530 includes a fingerprint sensing signal detection circuit 531 for detecting the fingerprint sensing signal sensed by the photosensitive circuit 440. Figure 6 is a schematic diagram of the photosensitive circuit 440, the multi-tasker 511, and the fingerprint sensing signal detection circuit 531 of the present disclosure.

[0130] The fingerprint sensing signal detection circuit 531 includes a switch 610, a capacitor 620, and an operational amplifier 630. One end of the switch 610 is connected to the second end b of the multi-tasker 511, one end of the capacitor 620, and the inverting input end (-) of the operational amplifier 630. The other end of the switch 610 is connected to the other end of the capacitor 620 and the output end of the operational amplifier 630. A control end of the switch 610 is connected to a reset signal Reset generated by the control unit 550. The non-inverting input end (+) of the operational amplifier 630 is connected to a reference voltage Vref. The gate of the thin film transistor 441 is connected to a scanning signal Scan generated by the fingerprint and scanning driving circuit 410.

[0131] Figure 7 is a timing diagram of the photosensitive circuit 440, the multi-tasker 511, and the fingerprint sensing signal detection circuit 531 of the present disclosure. In Figure 7 , the solid line voltage Vc represents the voltage of the capacitor 443 when there is no finger on the photosensitive circuit 440. The dashed line voltage Vc represents the voltage of the capacitor 443 when there is a finger on the photosensitive circuit 440. Fingerprint image detection using the photosensitive circuit 440 is well known to those skilled in the art based on the content of the present disclosure and is not described in detail.

[0132] Figure 8is another embodiment schematic diagram of the thin film transistor layer 345, the fingerprint and scanning driving circuit 410, and the display, touch and optical fingerprint control circuit 420 of the present application. The thin film transistor layer 345 has a plurality of pixel circuits 430, a plurality of photosensitive circuits 440, a plurality of scanning lines 450, a plurality of data lines 460, and a plurality of fingerprint data lines 810. The plurality of scanning lines 450 is arranged according to the first direction (Y-axis direction). The plurality of data lines 460 is arranged according to the second direction (X-axis direction). The plurality of fingerprint data lines 810 is arranged according to the second direction (X-axis direction).

[0133] As shown in Figure 8 , each scanning line of the plurality of scanning lines 450 and each data line of the plurality of data lines 460 is provided with a pixel circuit 430 at the intersection. Each scanning line 450 and each fingerprint data line of the plurality of fingerprint data lines 810 is provided with a photosensitive circuit 440 at the intersection.

[0134] That is, in the embodiment of Figure 4 , the photosensitive circuit 440 shares the scanning line 450 and the data line 460 with the pixel circuit 430, while in the embodiment of Figure 8 , the photosensitive circuit 440 only shares the scanning line 453 with the pixel circuit 430, and the photosensitive circuit 440 uses an independent fingerprint data line 810.

[0135] Figure 9 is a block diagram of the display, touch and optical fingerprint control circuit 420 of the present application Figure 8 . Compared with Figure 5 , since the photosensitive circuit 440 uses an independent fingerprint data line 810, in Figure 9 , the display, touch and optical fingerprint control circuit 420 includes the display driving unit 520, the optical fingerprint driving and sensing unit 530, the shared electrode and touch sensing unit 540, and the control unit 550.

[0136] Figure 10 is another embodiment schematic diagram of the thin film transistor layer 345, the fingerprint and scanning driving circuit 410, and the display, touch and optical fingerprint control circuit 420 of the present application. The thin film transistor layer 345 has a plurality of pixel circuits 430, a plurality of photosensitive circuits 440, a plurality of scanning lines 450, a plurality of data lines 460, a plurality of fingerprint scanning lines 1010 and a plurality of fingerprint data lines 1020. The plurality of scanning lines 450 is arranged according to the first direction (Y-axis direction). The plurality of data lines 460 is arranged according to the second direction (X-axis direction). The plurality of fingerprint scanning lines 1010 is arranged according to the first direction (Y-axis direction). The plurality of fingerprint data lines 1020 is arranged according to the second direction (X-axis direction).

[0137] like Figure 10 As shown, a pixel circuit 430 is provided at the junction of each of the plurality of scan lines 450 and each of the plurality of data lines 460, and a photosensitive circuit 440 is provided at the junction of each of the plurality of fingerprint scan lines 1010 and each of the plurality of fingerprint data lines 1020.

[0138] That is, in Figure 8 In this embodiment, the photosensitive circuit 440 shares a scan line 450 with the pixel circuit 430, and the photosensitive circuit 440 uses a separate data line 810. Figure 10 In this embodiment, the photosensitive circuit 440 uses a separate fingerprint scanning line 1010 and a fingerprint data line 1020. Furthermore, for ease of wiring... Figure 10 The fingerprint and scanning driving circuit in the embodiment can be divided into a fingerprint driving circuit 1040 and a scanning driving circuit 1030.

[0139] The priority of the touch detection operation is higher than the priority of the display operation and the priority of the fingerprint recognition operation. The priority of the display operation and the priority of the fingerprint recognition operation are the same. Figure 11 This is the present invention. Figure 10 The corresponding timing diagram is shown below. During time period T1, a display operation is performed. The scan drive circuit 1030 sequentially outputs an enable signal to the scan line 450 to activate the thin-film transistor 431 corresponding to the scan line 450, allowing an image signal to be written to the capacitor 433. During time period T2, a touch detection operation is performed. Since the touch detection operation has higher priority than the display operation, the display operation is paused first, and the touch detection operation is performed. The same applies to time periods T3, T5, T4, and T6. During time period T7, a fingerprint recognition operation is performed first, and the display operation is performed after the fingerprint recognition operation is completed. The fingerprint drive circuit 1040 outputs an enable signal to the fingerprint scan line 1010 to activate the thin-film transistor 441 corresponding to the fingerprint scan line 1010, allowing an initial voltage to be written to the capacitor 443, or the induced voltage on the capacitor 443 to be read.

[0140] Figure 12 This is a schematic diagram of the light guide plate 320 of the present invention. (See diagram below.) Figure 12 The diagram shows a cross-sectional view of the embedded optical fingerprint recognition display device 300 at line segment BB'. At least one light source 315 is located on one side of the light guide plate 320. The light guide plate 320 guides and modulates the direction of light from the at least one light source 315 to provide illumination to the embedded optical fingerprint recognition display device 300.

[0141] The light source 315 can be a cold cathode fluorescent light (CCFL) source, a hot cathode fluorescent light source, or a light emitting diode (LED) source to provide the light for the in-cell optical fingerprint recognition display device 300 to recognize the display device 300. Meanwhile, the light source 315 also provides the light for the photosensitive circuit 440. That is, when the at least one light source 315 is illuminated by a finger, a reflected light is generated, and the photosensitive circuit 440 receives the reflected light of the at least one light source 315 to generate an optical fingerprint image.

[0142] When performing the fingerprint recognition operation, if the finger is dirty or greasy, the visible light is easily absorbed, and thus the optical fingerprint image obtained by the photosensitive circuit 440 is often incomplete. Therefore, a light source other than the visible light wavelength can be used to obtain a better optical fingerprint image. In an embodiment, the light source further includes an infrared light source 317 to obtain a better optical fingerprint image.

[0143] The light collimator 375 is located on the light path of the reflected light reaching the photosensitive circuit 440 to assist the advancement of the reflected light to be parallel and straight, so as to avoid the divergence of the reflected light during propagation, resulting in loss of light energy. Figure 13 is a schematic diagram of the light collimator 375 of the present application. As shown in Figure 13 , the light collimator 375 includes a polarizer 1310 with a light condensing microstructure 1311 to allow the reflected light to reach the photosensitive circuit 440 in parallel and straight.

[0144] Figure 14 is another schematic diagram of the light collimator 375 of the present application. As shown in Figure 14 , the light collimator 375 is located on the black matrix (BM) 365, which is located on the side of the cover plate 370 facing the thin film transistor layer 345. The black matrix 365 is composed of a plurality of black lines 3651, and the light collimator 375 and the plurality of black lines 3651 are made using the same mask.

[0145] Figure 15 is still another schematic diagram of the light collimator 375 of the present application. As shown in Figure 15 , the light collimator 375 is located in a color filter layer (CF) 360, and the light collimator 375 and the color filter layer 360 can be made using the same process, that is, the light collimator 375 is designed using the RGB color blocking related design.

[0146] Figure 16 is still another schematic diagram of the light collimator 375 of the present application. As shown in Figure 16As shown, the light collimator 375 is composed of a plurality of liquid crystal pixels located at positions corresponding to the plurality of light sensing circuits 440. That is, the rotation angle of the liquid crystal above the plurality of light sensing circuits 440 is used to allow the reflected light to be parallel and directly incident on the plurality of light sensing circuits 440, thereby achieving the function of a light collimator.

[0147] In Figure 4 , Figure 8 and Figure 10 , only the plurality of light sensing circuits 440 are arranged in the region A of the thin film transistor layer 345, which is for the convenience of description. Since the size of the light sensing circuit 440 is smaller than the size of the pixel circuit 430, in other embodiments, the region A can also be arranged with both the light sensing circuit 440 and the pixel circuit 430.

[0148] Figure 17 is a use schematic diagram of the embedded optical fingerprint recognition display device 300 of the present application. It is used to wake up the optical fingerprint recognition function by using the touch function of the embedded optical fingerprint recognition display device 300. That is, only when the finger touches the region (for example, the region A) with the light sensing circuit 440, the optical fingerprint recognition function will start to work. When the finger touches the region (non-region A) without the light sensing circuit 440, the optical fingerprint recognition function will not work. After the optical fingerprint recognition function is correctly woken up, the at least one light source 315 is turned on, so as to avoid unnecessary power loss. In the present application, the light sensing circuit can be prepared together with the process of the pixel circuit, so that the optical fingerprint function can be embedded in the display region, and the screen-to-body ratio can be improved.

[0149] In the present application, a plurality of light sensing circuits 440 are arranged in the thin film transistor layer 345 to perform fingerprint recognition operation, so that the same LCD panel has three functions of display, touch detection, and fingerprint recognition. Since the panel does not need to be cut into special shapes, the panel yield and cost can be reduced again. At the same time, there is no need to prepare additional fingerprint recognition components, which can reduce the cost and simplify the material control. And because the fingerprint recognition function can be integrated into the LCD panel without special cutting, there is no need for additional opening process of components, which can increase the waterproofness of the terminal product, such as a mobile phone.

[0150] The embedded optical fingerprint recognition display device and embodiments of the present application are described by using specific examples in the present application, and the above implementation manners are only used to help understand the method and core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in specific embodiments and application range; in summary, the content of the specification should not be understood as a limitation of the present application, and the protection scope of the present application should be subject to the appended claims.

Claims

1. A control circuit of an in-cell optical fingerprint recognition display device, wherein the in-cell optical fingerprint recognition display device has a plurality of scan lines arranged according to a first direction and a plurality of data lines arranged according to a second direction, each scan line and each data line intersecting at a pixel circuit or a photosensitive circuit, the control circuit comprising: a multi-tasking unit having a plurality of multi-taskers, each multi-tasker having a first end, a second end, and a third end, the first end connected to a corresponding data line of the plurality of data lines; a display driving unit connected to the plurality of data lines and the second end of each multi-tasker; an optical fingerprint driving and sensing unit connected to the third end of each multi-tasker; and a control unit connected to the multi-tasking unit to connect the first end to the second end of each multi-tasker to write display data via the multi-tasking unit and the plurality of data lines to the corresponding pixel circuit to provide a display operation, or to connect the first end to the third end of each multi-tasker to write an initial voltage via the multi-tasking unit and the plurality of data lines to at least one photosensitive circuit in the in-cell optical fingerprint recognition display device, or to read a sensing voltage of at least one photosensitive circuit in the in-cell optical fingerprint recognition display device via the multi-tasking unit and the plurality of data lines to provide a fingerprint recognition operation.

2. The control circuit of the in-cell optical fingerprint recognition display device of claim 1, wherein, The plurality of pixel circuits and the plurality of photosensitive circuits are located in the same layer.

3. The control circuit of the in-cell optical fingerprint recognition display device of claim 2, wherein, The optical fingerprint driving and sensing unit comprises a fingerprint sensing signal detection circuit, the fingerprint sensing signal detection circuit comprising a switch, a capacitor, and an operational amplifier, one end of the switch connected to the second end of the multi-tasker, one end of the capacitor, and the inverting input of the operational amplifier, the other end of the switch connected to the other end of the capacitor and the output of the operational amplifier, a control end of the switch connected to a reset signal generated by the control unit, and the non-inverting input of the operational amplifier connected to a reference voltage.

4. The control circuit of the in-cell optical fingerprint recognition display device of claim 1, wherein, The in-cell optical fingerprint recognition display device further comprises a plurality of transparent sensing electrode blocks arranged according to the first and second directions.

5. The control circuit of the in-cell optical fingerprint recognition display device of claim 4, further comprising: a common electrode and touch sensing unit connected to the plurality of transparent sensing electrode blocks to perform self-capacitance touch detection or to provide a common voltage for display operation.

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