TW201911006A - In-display optical fingerprint identification display device - Google Patents

Abstract

An in-cell optical fingerprint identification device includes at least one light source, a collimator, a thin film transistor layer, and a transparent sensing and common voltage layer. The collimator guides the light direction of the at least one light source. The thin film transistor layer is disposed on one side of the collimator and includes a plurality of pixel circuits, a plurality of photo sense circuits, a plurality of scan lines and a plurality of data lines. The plurality of scan lines and the plurality of data lines are arranged in a first direction and a second direction, respectively. The transparent sensing and common voltage layer is disposed on one side of the thin film transistor layer opposite to the collimator and includes a plurality of transparent sense electrodes. The plurality of transparent sense electrodes are arranged in the first direction and the second direction, respectively. The plurality of photo sense circuits receive the reflection light of the at least one light source to generate an optical fingerprint image.

Description

In-line optical fingerprint identification display device

The disclosure relates to the technical field of fingerprint identification, and more particularly to an in-line optical fingerprint identification display device.

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 and fingerprint recognition. 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. FIG. 1 is a schematic diagram of a conventional 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 side of the mobile phone, the area that the touch screen 120 of the mobile phone can display is reduced.

In the mobile phone design, in order to display more information, the mobile phone display screens are all facing the high screen. At the same time, in order to place a fingerprint recognition system or a camera on the front of the mobile phone, the touch screen 120 needs to be shaped to place the relevant components. 2 is a schematic diagram of another conventional mobile phone 200. In order to accommodate the fingerprint recognition module 110, the mobile phone display screen 220 is profiled to hollow out an area on the display screen 220, as indicated by the elliptical dotted line in FIG. However, when the display screen 220 is profiled, it is necessary to perform profile cutting on the relevant components of the display screen (such as a substrate, a light guide plate, a thin film transistor layer, ..., a protective glass, etc.), which increases many processing procedures and also increases assembly. The difficulty, and thus the cost, is greatly increased. Therefore, there is still room for improvement in the conventional in-cell optical fingerprint recognition display device.

The purpose of the disclosure is mainly to provide an in-line optical fingerprint identification display device, which is provided with a plurality of photosensitive circuits in a thin film transistor layer of a liquid crystal display device for performing fingerprint identification operation, so that the same panel can be displayed. , touch detection, and fingerprint recognition. Since the panel does not require profile cutting, panel yield and cost can be reduced again. At the same time, there is no need to prepare additional fingerprint identification components, which can reduce costs and simplify material control. And the fingerprint recognition function can be integrated into the panel because no special shape cutting is required, so the mobile phone design does not need to be opened, and the waterproofness can be increased.

According to one of the features of the present disclosure, the present disclosure provides an in-cell optical fingerprint recognition display device including at least one light source, a light guide plate, a thin film transistor layer, and a touch sensing and common electrode layer. The light guide plate guides a light direction of the at least one light source. The thin film transistor layer is located on one side of the light guide plate, and has a plurality of pixel circuits, a plurality of photosensitive circuits, a plurality of scanning lines, and a plurality of data lines, wherein the plurality of scanning lines are disposed according to a first direction, The plurality of data lines are set according to a second direction. The touch sensing and common electrode layer is located on a side of the thin film transistor layer opposite to the light guide plate, and has a plurality of transparent sensing electrode blocks, and the plurality of transparent sensing electrode blocks are according to the first direction and the The second direction is set, wherein the plurality of photosensitive circuits receive the reflected light of the at least one light source to generate an optical fingerprint image.

The present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the disclosure and are not intended to limit the disclosure.

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

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

The reflector 310 is located on the support layer 305 and is located on the side of the light guide plate 320 opposite to the thin film transistor layer 345. The light leaked from the light guide plate 320 is reflected back into the light guide plate 320 to prevent the at least one. Light leakage from the light source 315. The diffuser plate 325 is located on one side of the light guide plate 320 for one side of the thin film transistor layer 345 to form a uniform surface light source for the light outputted by the light guide plate 320.

The back surface brightness enhancement film 330 is located on the side of the diffusion plate 325 on one side of the thin film transistor layer 345 to brighten the surface light source output from the diffusion plate 325. The front brightness enhancement film 335 is located on the side of the back brightness enhancement film 330 on one side of the thin film transistor layer 345 to brighten the surface light source output from the diffusion plate 325.

The lower polarizing layer 340 is located on the side of the front brightness enhancing film 335 on one side of the thin film transistor layer 345 to convert the non-polarized surface light source output from the front brightness enhancing film 335 into a polarization surface light source.

The thin film transistor layer 345 is located on one 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 FIG. 4). The plurality of photosensitive circuits receive the reflected light of the at least one light source 315 to generate an optical fingerprint image.

The display material layer 350 is located on one side of the thin film transistor layer 345 opposite to the light guide plate 320. The material of the display material layer 350 may be a liquid crystal.

The touch sensing and common electrode layer 355 is located on one 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, and the plurality of touch sensing electrode blocks 3551 are According to the first direction and the second direction. The touch sensing electrode block 3551 can be transparent or nearly transparent, and can be used for touch detection.

The light shielding layer 365 is located on one side of the cover plate 370 on one side of the thin film transistor layer 345, and the light shielding layer 365 has a plurality of light shielding lines 3651. The plurality of shading lines 3651 are arranged in a matrix, 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.

The light collimator 375 is located at a side of the plurality of photosensitive circuits facing away from one side of the light guide plate 320 to assist the advancement of the reflected light to be parallel straight. The light collimator 375 is located on the optical path of the reflected light reaching a plurality of photosensitive circuits. The collimator may 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.

The in-line optical fingerprint recognition display device 300 further includes a fingerprint and scan driving circuit 410 and a display, touch and optical fingerprint control circuit 420, and a thin film transistor layer 345, as shown in FIG. 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, and a plurality of data lines 460. The plurality of scanning lines 450 are arranged according to a first direction (Y-axis direction). The plurality of data lines 460 are set according to a second direction setting (X-axis direction).

A pixel circuit 430 or a light sensing circuit 440 is disposed at the intersection of each of the scan lines 450 and each of the data lines 460. Each of the pixel circuits 430 includes a thin film transistor 431 and a capacitor 433. Each of the photoreceptor circuits 440 includes a thin film transistor 441, a capacitor 443, and a photodiode 445.

As shown in FIG. 4, the scan line 451 is connected to a plurality of thin film transistors 431 for performing a simple display operation. The scan line 453 is connected to a plurality of thin film transistors 431 and a plurality of thin film transistors 441 for performing display operations and fingerprint recognition operations.

The fingerprint and scan driving circuit 410 is connected to the plurality of scanning lines 450 to sequentially or randomly turn on the pixel circuit 430 or the photosensitive circuit 440 corresponding to one of the plurality of scanning lines 450. The display, touch and optical fingerprint control circuit 420 is coupled to the fingerprint and scan drive circuit 410 and the plurality of data lines 460. As shown in FIG. 4, the photosensitive circuit 440 is fabricated together with the pixel circuit 430, so that the photosensitive circuit 440 can be disposed in the display area.

5 is a block diagram of the display, touch and optical fingerprint control circuit 420 of the present disclosure. As shown in FIG. 5, the display, touch and optical fingerprint control circuit 420 includes a multiplex unit 510, a display driving unit 520, an optical fingerprint driving and sensing unit 530, a common electrode and touch sensing unit 540, And a control unit 550.

The multiplex unit 510 has a plurality of multiplexers 511. Each multiplexer 511 has a first end a, a second end b, and a third end c. The first end a is connected to the plurality of data. One of the lines corresponds to the data line 460. The display driving unit 520 is connected to the second end b of each multiplexer 511 to write the display data to the corresponding pixel circuit 430 via the multiplex unit 510 and the plurality of data lines 460.

The optical fingerprint driving and sensing unit 530 is connected to the third end c of each multiplexer 511 to write an initial voltage Vini to the corresponding photosensitive circuit 440 via the multiplexing unit 510 and the plurality of data lines 460. Or inducing a voltage of one of the corresponding photosensitive circuits 440 via the multiplex unit 510 and the plurality of data lines 460.

The common electrode and the touch sensing unit 540 are connected to the plurality of transparent sensing electrode blocks 3551 of the touch sensing and common electrode layer 355, so that the plurality of transparent sensing electrode blocks 3551 are, for example, self-capacitance. Touch detection, or the plurality of touch sensing electrode blocks 3551 provide a common voltage Vcom for display operation.

The plurality of touch sensing electrode blocks 3551 can be formed by cutting the touch sensing and common electrode layer 355, and the self-capacitance touch is performed by using the plurality of touch sensing electrode blocks 3551. When the touch detection or the display operation, a common voltage is applied to the plurality of transparent sensing electrode blocks 3551, so that the plurality of touch sensing electrode blocks 3551 form a common voltage layer, which is well known to the skilled person. It can be completed based on the contents of the disclosure, and will not be described.

The control unit 550 is connected to the multiplex unit 510, the display driving unit 520, the optical fingerprint driving and sensing unit 530, the common electrode and touch sensing unit 540, and the fingerprint and scan driving circuit 410 to provide a display. Operation, one touch detection operation, or a timing and control signal for a fingerprint identification operation.

The optical fingerprint driving and sensing unit 530 includes a fingerprint sensing signal detecting circuit 531 for detecting the fingerprint sensing signal sensed by the photosensitive circuit 440. FIG. 6 is a schematic diagram of the photosensitive circuit 440, the multiplexer 511, and the fingerprint sensing signal detecting circuit 531 of the present disclosure.

The fingerprint sensing signal detecting 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 multiplexer 511, one end of the capacitor 620, and an inverting input terminal (-) of the operational amplifier 630. The other end of the switch 610 is coupled to the other end of the capacitor 620 and to the output of the operational amplifier 630. A control terminal of the switch 610 is coupled to a reset signal Reset generated by the control unit 550. The non-inverting input (+) of the operational amplifier 630 is coupled to a reference voltage Vref. The gate of the thin film transistor 441 is connected to a scan signal Scan which is generated by the fingerprint and the scan driving circuit 410.

FIG. 7 is a timing diagram of the photosensitive circuit 440, the multiplexer 511, and the fingerprint sensing signal detecting circuit 531 of the present disclosure. In FIG. 7, the voltage Vc of the solid line represents the voltage of the capacitor 443 when there is no finger on the photosensitive circuit 440. The dotted voltage Vc represents the voltage of the capacitor 443 when there is a finger on the photosensitive circuit 440. The use of the photosensitive circuit 440 for fingerprint image detection is well known to those skilled in the art based on the disclosure of the present disclosure, and will not be described again.

FIG. 8 is a schematic diagram of another embodiment of the thin film transistor layer 345, the fingerprint and scan driving circuit 410, and the display, touch and optical fingerprint control circuit 420 of the present disclosure. 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 are based on the first In one direction (Y-axis direction), the plurality of data lines 460 are disposed according to the second direction (X-axis direction), and the plurality of fingerprint data lines 810 are disposed according to the second direction (X-axis direction).

As shown in FIG. 8, a pixel circuit 430 is disposed at each of the scan lines of the plurality of scan lines 450 and each of the plurality of data lines 460, and each of the scan lines 450 and the plurality of fingerprints A photosensitive circuit 440 is disposed at each of the fingerprint data line intersections of the data lines 810.

That is, in the embodiment of FIG. 4, the photosensitive circuit 440 shares the scan line 450 and the data line 460 with the pixel circuit 430. In the embodiment of FIG. 8, the photosensitive circuit 440 is only associated with the pixel circuit 430. A scan line 453 is shared, which uses a separate fingerprint data line 810.

FIG. 9 is a block diagram of the display, touch and optical fingerprint control circuit 420 of FIG. Compared with FIG. 5, since the photosensitive circuit 440 uses a separate fingerprint data line 810, the display, touch and optical fingerprint control circuit 420 includes the display driving unit 520, and the optical fingerprint driving and sensing unit. 530. The common electrode and touch sensing unit 540 and the control unit 550.

10 is a schematic diagram of still another embodiment of the thin film transistor layer 345, the fingerprint and scan driving circuit 410, and the display, touch and optical fingerprint control circuit 420 of the present disclosure. 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 are disposed according to the first direction (Y-axis direction), and the plurality of data lines 460 are disposed according to the second direction (X-axis direction). The plurality of fingerprint scanning lines 1010 are arranged according to the first direction (Y-axis direction), and the plurality of fingerprint data lines 1020 are set according to the second direction (X-axis direction).

As shown in FIG. 10, a pixel circuit 430 is disposed at each of the scan lines of the plurality of scan lines 450 and each of the plurality of data lines 460, and each scan line of the plurality of fingerprint scan lines 1010 is provided. And a photosensitive circuit 440 is disposed at each of the fingerprint data lines of the plurality of fingerprint data lines 1020.

That is, in the embodiment of FIG. 8, the photosensitive circuit 440 shares the scan line 450 with the pixel circuit 430, and the photosensitive circuit 440 uses a separate data line 810. In the embodiment of FIG. 10, the photosensitive circuit 440 uses the separate fingerprint scan line 1010 and the fingerprint data line 1020. For convenience of wiring, the fingerprint and scan driving circuit in the embodiment of FIG. 10 can be divided into a fingerprint driving circuit 1040 and a scan driving circuit 1030.

The priority of the touch detection operation is higher than the priority of the display operation and the priority of the fingerprint recognition operation, and the priority of the display operation is the same as the priority of the fingerprint recognition operation. FIG. 11 is a timing chart corresponding to FIG. 10 . As shown in the figure, the display operation is performed in the period T1. The scan driving circuit 1030 sequentially outputs an enable signal to the scan line 450 to turn on the thin film transistor 431 corresponding to the scan line 450, and writes an image signal to the capacitor 433. . The touch detection operation is performed in the time period T2. Since the priority of the touch detection operation is higher than the priority of the display operation, the display operation is paused first, and the touch detection operation is performed. The same is true for the time periods T3, T5, T4, and T6. The fingerprint identification operation is performed first in the time period T7, and the display operation is performed after the fingerprint identification operation is performed. The fingerprint driving circuit 1040 outputs an opening signal to the fingerprint scanning line 1010 to turn on the thin film transistor 441 corresponding to the fingerprint scanning line 1010, and writes the initial voltage to the capacitor 443 or the induced voltage on the capacitor 443.

FIG. 12 is a schematic diagram of the light guide plate 320 of the present disclosure. As shown in Fig. 12, it shows a cross-sectional view of the in-line optical fingerprint recognition display device 300 at line segment BB'. The at least one light source 315 is located at one side of the light guide plate 320. The light guide plate 320 guides and changes the direction of the light of the at least one light source 315 to provide illumination of the display device 300 by the inline optical fingerprint recognition display device.

The light source 315 can be a cold cathode fluorescent tube (CCFL) light source, a hot cathode fluorescent tube light source, or a light emitting diode (LED) light source to provide illumination of the inline optical fingerprint recognition display device identification display device 300. Illumination of the photosensitive circuit 440 is also provided. That is, when the at least one light source 315 shines on 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.

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

The light collimator 375 is located on the light path of the reflected light reaching the plurality of photosensitive circuits 440 to assist the advancement of the reflected light to achieve parallel straightening, and to avoid divergence when the reflected light propagates, resulting in loss of optical energy. Figure 13 is a schematic illustration of one of the light collimators 375 of the present disclosure. As shown in FIG. 13, the light collimator 375 includes a polarizer 1310 having a concentrating microstructure 1311 to allow the reflected light to pass parallel to the plurality of photosensitive circuits 440.

Figure 14 is another schematic illustration of the light collimator 375 of the present disclosure. As shown in FIG. 14, the light collimator 375 is located on the light shielding layer (BM) 365, and the light shielding layer 365 is located on one side of the cover plate 370 for one side of the thin film transistor layer 345. The light shielding line 3651 is formed, and the light collimator 375 is made of the same light mask as the plurality of light shielding lines 3651.

15 is another schematic diagram of the light collimator 375 of the present disclosure. As shown in FIG. 15, the light collimator 375 is disposed in a color filter layer (CF) 360. The light collimator 375 and the color filter layer 360 can be fabricated using the same process, that is, using RGB color resistance. The design of the light collimator 375 is performed in accordance with the design.

Figure 16 is a further schematic view of the light collimator 375 of the present disclosure. As shown in FIG. 16, the optical collimator 375 is composed of a plurality of liquid crystal pixels located corresponding to the plurality of photosensitive circuits 440. That is, the rotation angle of the liquid crystal above the plurality of photosensitive circuits 440 is utilized to allow the reflected light to go straight in parallel to the plurality of photosensitive circuits 440 to achieve the function of the optical collimator.

In FIG. 4, FIG. 8 and FIG. 10, the region A in the thin film transistor layer 345 is provided with only the plurality of photosensitive circuits 440, which is merely for convenience of explanation. Since the size of the photosensitive circuit 440 is smaller than the size of the pixel circuit 430, in other embodiments, the area A can also be provided with the photosensitive circuit 440 and the pixel circuit 430 at the same time.

FIG. 17 is a schematic diagram of the use of the in-cell optical fingerprint recognition display device 300. It uses the touch function of the in-line optical fingerprint recognition display device 300 to wake up the optical fingerprint recognition function. That is, the optical fingerprint recognition function will only start when the finger touches the area of the photosensitive circuit 440 (for example, the area A). The optical fingerprinting function does not work when the finger touches the area without the photosensitive circuit 440 (non-area A). After the optical fingerprint recognition function is properly awake, the at least one light source 315 is turned on to avoid unnecessary power loss. In the present invention, the photosensitive circuit can be prepared together with the process of the pixel circuit, so that the optical fingerprint function can be embedded in the display area, and the screen ratio can be increased.

In the disclosure, a plurality of photosensitive circuits 440 are disposed on the thin film transistor layer 345 for fingerprint identification operation, so that the same LCD panel has three functions of display, touch detection, and fingerprint recognition. Since the panel does not require profile cutting, panel yield and cost can be reduced again. At the same time, there is no need to prepare additional fingerprint identification components, which can reduce costs and simplify material control. Moreover, since the fingerprint recognition function can be integrated into the LCD panel without the need for profile cutting, it is not necessary to additionally open the component, and the terminal product, such as the waterproofness of the mobile phone, can be increased.

In the foregoing examples, the selection of each region is for illustrative purposes only and is not intended to limit the scope of the invention. A person skilled in the art can change the selection range of each area according to the disclosure of the disclosure.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

100‧‧‧Mobile phones

110‧‧‧Fingerprint Identification Module

120‧‧‧ touch screen

200‧‧‧Mobile phones

220‧‧‧Mobile display screen

300‧‧‧Inline optical fingerprint identification display device

305‧‧‧Support layer

310‧‧‧reflector

315‧‧‧Light source

320‧‧‧Light guide plate

325‧‧‧Diffuser

330‧‧‧Back brightness film

335‧‧‧ Front brightening film

340‧‧‧low polarizing layer

345‧‧‧thin film layer

350‧‧‧Display material layer

355‧‧‧Touch sensing and common electrode layer

360‧‧‧Color filter layer

365‧‧‧ shading layer

370‧‧‧ cover

375‧‧‧Light collimator

3651‧‧‧ shading line

3551‧‧‧Induction electrode block

440‧‧‧Photosensitive circuit

410‧‧‧Fingerprint and scan drive circuit

420‧‧‧Display, touch and optical fingerprint control circuits

430‧‧‧ pixel circuit

450, 451, 453‧‧‧ scan lines

460‧‧‧ data line

431,441‧‧‧film transistor

433,443‧‧‧ capacitor

445‧‧‧Photosensitive diode

510‧‧‧Multiple units

520‧‧‧Display driver list

530‧‧‧Optical fingerprint drive and sensing unit

540‧‧‧Common electrode and touch sensing unit

550‧‧‧Control unit

511‧‧‧Multiplexer

A‧‧‧first end

B‧‧‧second end

C‧‧‧third end

Vini‧‧‧ initial voltage

Vcom‧‧‧Common voltage

531‧‧‧Fingerprint sensing signal detection circuit

610‧‧‧Switch

620‧‧‧ Capacitance

630‧‧‧Operational Amplifier

Reset‧‧‧Reset signal

Scan‧‧‧ scan signal

Vc‧‧‧voltage of capacitor 443

810‧‧‧Finger data line

1010‧‧‧Fingerprint scanning line

1020‧‧‧Finger data line

1040‧‧‧Fingerprint driver circuit

1030‧‧‧Scan drive circuit

T1~T7‧‧‧

BB’‧‧‧ segment

1310‧‧‧ polarizer

1311‧‧‧ Concentrating microstructure

A‧‧‧ area

Figure 1 is a schematic diagram of a conventional mobile phone. 2 is a schematic diagram of another conventional mobile phone. 3 is a schematic cross-sectional view of the in-cell optical fingerprint identification display device of the present disclosure. 4 is a schematic diagram of an embodiment of a thin film transistor layer, a fingerprint and a scan driving circuit, and a display, touch and optical fingerprint control circuit of the present disclosure. 5 is a block diagram of the display, touch and optical fingerprint control circuitry of the present disclosure. 6 is a schematic diagram of a photosensitive circuit, a multiplexer, and a fingerprint sensing signal detecting circuit of the present disclosure. FIG. 7 is a timing diagram of the photosensitive circuit, the multiplexer, and the fingerprint sensing signal detecting circuit of the present disclosure. 8 is a schematic diagram of another embodiment of a thin film transistor layer, a fingerprint and a scan driving circuit, and a display, touch and optical fingerprint control circuit of the present disclosure. 9 is a block diagram of the display, touch and optical fingerprint control circuit of FIG. 8 . 10 is a schematic diagram of still another embodiment of the thin film transistor layer, the fingerprint and scan driving circuit, and the display, touch and optical fingerprint control circuit of the present disclosure. FIG. 11 is a timing chart corresponding to FIG. 10 . Figure 12 is a schematic view of the light guide plate of the present invention. Figure 13 is a schematic illustration of one of the light collimators of the present disclosure. Figure 14 is another schematic view of the light collimator of the present disclosure. Figure 15 is another schematic view of the light collimator of the present disclosure. Figure 16 is a further schematic view of the light collimator of the present disclosure. Figure 17 is a schematic view showing the use of the in-cell optical fingerprint identification display device.

Claims (18)

An in-line optical fingerprint identification display device comprising: at least one light source; a light guide plate guiding a light direction of the at least one light source; and a thin film transistor layer on a side of the light guide plate having a plurality of pixels a circuit, a plurality of photosensitive circuits, a plurality of scanning lines and a plurality of data lines, the plurality of scanning lines are arranged according to a first direction, the plurality of data lines are arranged according to a second direction; and a touch sensing and sharing An electrode layer is disposed on a side of the thin film transistor layer opposite to the light guide plate, and has a plurality of touch sensing electrode blocks, wherein the plurality of transparent sensing electrode blocks are disposed according to the first direction and the second direction The plurality of photosensitive circuits receive the reflected light of the at least one light source to generate an optical fingerprint image. The in-cell optical fingerprint identification display device of claim 1, further comprising: a light collimator located at a side of the plurality of photosensitive circuits opposite to one side of the light guide plate, assisting the The progress of the reflected light reaches parallel straight. The in-cell optical fingerprint identification display device of claim 2, further comprising: a reflector disposed on a side of the light guide plate opposite to one side of the thin film transistor layer, and the reflective portion is output from the light guide plate a diffusing plate on the side of the light guiding plate for one side of the thin film transistor layer; a back brightness enhancing film on the side of the diffusing plate for one side of the thin film transistor layer; and a front brightening a film on the side of the back brightness enhancing film on one side of the thin film transistor layer. The in-cell optical fingerprint identification display device of claim 2, further comprising: a cover plate; a light shielding layer on the same side of the cover plate relative to the thin film transistor layer, the light shielding layer having a majority a light-shielding line; and a color filter layer located between the plurality of light-shielding lines of the light-shielding layer and the surface of the plurality of light-shielding lines. The in-cell optical fingerprint identification display device of claim 1, wherein a pixel circuit or a photosensitive circuit is disposed at the intersection of each of the scanning lines and each of the scanning line data lines. The in-cell optical fingerprint identification display device of claim 5, wherein the pixel circuit comprises a thin film transistor and a capacitor, the photosensitive circuit comprising a thin film transistor, a capacitor and a photodiode body. The in-cell optical fingerprint identification display device of claim 6, further comprising: a fingerprint and scan driving circuit connected to the plurality of scan lines to sequentially or randomly open the plurality of scan lines a pixel corresponding to the pixel circuit or the photosensitive circuit; and a display, touch and optical fingerprint control circuit connected to the fingerprint and scan driving circuit and the plurality of data lines. The in-cell optical fingerprint identification display device of claim 7, wherein the display, touch and optical fingerprint control circuit comprises: a multiplex unit having a plurality of multiplexers, each multiplexer a first end, a second end, and a third end, the first end is connected to one of the plurality of data lines; a display driving unit is connected to the second of each multiplexer End, the display data is written to the corresponding pixel circuit via the multiplex unit and the plurality of data lines; and an optical fingerprint driving and sensing unit is connected to the third end of each multiplexer to The initial voltage is written to the corresponding photosensitive circuit via the multiplex unit and the plurality of data lines, or the induced voltage of the corresponding photosensitive circuit is read through the multiplex unit and the plurality of data lines. The in-cell optical fingerprint identification display device of claim 8, wherein the display, touch and optical fingerprint control circuit further comprises: a common electrode and a touch sensing unit connected to the touch sensing and Sharing the plurality of touch sensing electrode blocks of the electrode layer, so that the plurality of transparent sensing electrode blocks perform self-capacitance touch detection, or the plurality of touch sensing electrode blocks provide a common voltage for display And a control unit connected to the multiplex unit, the display driving unit, the optical fingerprint driving and sensing unit, the common electrode and the touch sensing unit, and the fingerprint and scan driving circuit to provide a display operation, A touch detection operation, or a timing and control signal for a fingerprint identification operation. The in-cell optical fingerprint identification display device of claim 9, wherein the priority of the touch detection operation is higher than a priority of the display operation and a priority of the fingerprint recognition operation, the display operation The priority is the same as the priority of the fingerprinting operation. The in-cell optical fingerprint identification display device of claim 1, wherein the thin film transistor layer further comprises: a plurality of fingerprint data lines, which are set according to the second direction, wherein the plurality of scan lines a pixel circuit is disposed at the intersection of each of the scan lines and each of the plurality of data lines, and each of the scan lines and each of the plurality of fingerprint data lines is provided with a photosensitive circuit at the intersection of the fingerprint data lines . The in-cell optical fingerprint identification display device of claim 1, wherein the thin film transistor layer further comprises: a plurality of fingerprint scanning lines, which are set according to the first direction; and a plurality of fingerprint data lines, The system is configured according to the second direction, wherein each of the plurality of scan lines and each of the plurality of data lines are provided with a pixel circuit at each of the plurality of data lines, and each of the plurality of fingerprint scan lines A photosensitive circuit is disposed at the intersection of the fingerprint scanning line and each of the plurality of fingerprint data lines. The in-cell optical fingerprint identification display device of claim 2, wherein the optical collimator comprises a polarizer having a concentrating microstructure. The in-cell optical fingerprint identification display device of claim 2, wherein the optical collimator is located in a light shielding layer, and the light shielding layer (BM) is located on a surface of the cover plate for the thin film transistor layer. On one side, the light shielding layer is composed of a plurality of light shielding lines, and the light collimator is made of the same light mask as the plurality of light shielding lines. The in-cell optical fingerprint identification display device of claim 2, wherein the optical collimator is located in a color filter layer, and the light collimator and the color filter layer use the same mask production. The in-cell optical fingerprint recognition display device of claim 2, wherein the optical collimator is composed of a plurality of liquid crystal pixels located at a position corresponding to the plurality of photosensitive circuits. The in-cell optical fingerprint identification display device of claim 1, wherein 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. The in-cell optical fingerprint identification display device of claim 16, wherein the at least one light source further comprises an infrared or visible light source.