TWI827278B - Curved display device having fingerpring identification function - Google Patents

Abstract

The present invention provides a curved display device having fingerpring identification function, comprising a curved display panel, a plurality of fingerprint identification modules and a flexible circuit board, wherein the plurality of fingerprint identification modules are arranged on the back of the curved display panel, and the flexible circuit board is electrically connected to the plural fingerprint identification modules. The present invention can reduce the gap between each fingerprint identification module and the back surface of the curved display panel, thereby reducing the possibility of bubbles being generated.

Description

Curved display device with fingerprint recognition function

The present invention relates to a curved surface display device, and in particular to a curved surface display device with a fingerprint recognition module.

Fingerprint recognition technology has gradually developed in recent years and has been widely used in display devices such as smartphones and tablet computers. By installing a fingerprint recognition module in the display device for fingerprint recognition, it is an important means to unlock the display device. Compared with the need to manually enter passwords in the past, it is more time-saving and more convenient, so it has become a well-known biometric technology.

In traditional fingerprint recognition technology, physical buttons for fingerprint recognition are provided on the display device. The physical buttons are generally arranged on the front, side or back of the display device. However, as people pursue a higher screen-to-body ratio, Therefore, the technology of fingerprint recognition using physical buttons has gradually declined. Instead, under-screen fingerprint recognition technology has begun to flourish. By setting a fingerprint recognition module in the display panel of the display device, the display device includes a display panel. The panel includes a display surface and a backside relative to the display surface, and the fingerprint recognition module will be set on the backside of the display panel, so that the fingerprint recognition module can be achieved without affecting the area used for screen display on the display panel. In addition, in order to make the fingerprint of the user's finger easy to be sensed by the fingerprint recognition module, a preset area for the user to perform fingerprint recognition is generally defined in the display area (Active area, AA) of the display device, hereinafter referred to as It is a fingerprint recognition area. Generally, the range of the fingerprint recognition area will cover as much as possible the positions easily accessible to the user's fingers, and the fingerprint recognition module will also be set corresponding to the fingerprint recognition area.

In recent years, in the development of display devices, in order to enhance the user's visual immersion, the proportion of display devices using curved surface designs has gradually increased. Hereinafter, display devices using curved surface designs will be referred to as "curved surface display devices". However, while the curved display device brings a good experience to the user, it also creates some problems. One of the problems is that when the curved display device is combined with under-screen fingerprint recognition technology, since the display panel of the curved display device will also have a curved surface, the following will A display panel with a curved surface is called a "curved display panel". Therefore, when the fingerprint recognition module is installed on the back of the curved display panel, a gap will appear between the fingerprint recognition module and the curved display panel, which will cause problems when installing the fingerprint recognition module. Bubbles are generated, causing abnormalities when the fingerprint recognition module performs the fingerprint recognition function.

The purpose of the present invention is to solve the problem that when a curved display device is combined with under-screen fingerprint recognition technology, there will be a gap between the display panel of the curved display device and the fingerprint recognition module, which affects the fingerprint recognition module's ability to perform the fingerprint recognition function.

Based on the purpose of the present invention, the present invention provides a curved display device with a fingerprint recognition function, including a curved display panel, a plurality of fingerprint recognition modules and a flexible circuit board, wherein the curved display panel defines a display area and non-circuit areas located around the display area. A display area, wherein the display area defines a fingerprint recognition area; wherein the curved display panel includes a display surface and a backside opposite to the display surface; wherein a plurality of fingerprint recognition modules are provided on the backside of the curved display panel and are configured corresponding to the fingerprint recognition area; The flexible circuit board is electrically connected to multiple fingerprint recognition modules.

In one embodiment of the present invention, optical glue is filled between the plurality of fingerprint recognition modules and the back of the curved display panel.

In an embodiment of the present invention, the plurality of fingerprint recognition modules are ultrasonic fingerprint recognition modules or optical fingerprint recognition modules.

In one embodiment of the present invention, when the fingerprint recognition module is an ultrasonic fingerprint recognition module, the fingerprint recognition module includes a thin film transistor substrate, a piezoelectric layer and an electrode layer; wherein the thin film transistor substrate is disposed on the curved display panel The back side of the piezoelectric layer is arranged on the lower surface of the thin film transistor substrate; and the electrode layer is arranged on the lower surface of the piezoelectric layer.

In one embodiment of the present invention, the material of the thin film transistor substrate is polyimide (PI), polyethylene terephthalate (PET) or polyethylene naphthalate. (polyethylene naphthalate, PEN).

In one embodiment of the present invention, a plurality of fingerprint recognition modules are arranged in an array on the back of the curved display panel.

In one embodiment of the present invention, a plurality of fingerprint recognition modules are arranged on the back of the curved display panel in a staggered manner in adjacent rows and columns.

In one embodiment of the present invention, a plurality of fingerprint recognition modules are arranged in a random arrangement on the back of the curved display panel.

In one embodiment of the present invention, the curved display panel includes a cover and a display module; the display module is disposed on the lower surface of the cover; and the plurality of fingerprint recognition modules are disposed on the lower surface of the display module.

In one embodiment of the present invention, the curved display panel includes a cover, a touch module and a display module; the touch module is disposed on the lower surface of the cover; and the display module is disposed on the lower surface of the touch module. The lower surface; wherein a plurality of fingerprint recognition modules are arranged on the lower surface of the display module.

In order to make it easy for those with ordinary knowledge in the technical field to understand the content of the present invention, the present invention will be further described below in conjunction with the embodiments and drawings. Each embodiment is only used to illustrate the technical features of the present invention. The mentioned content It does not limit the invention.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "back", etc. is based on the orientation or positional relationship shown in each drawing. , is only used to facilitate the description of the present invention and simplify the description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms “first”, “second”, “third” and “fourth” are used for descriptive purposes only and shall not be construed as indicating or implying relative importance.

Reference throughout this specification to "one embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, references to "one embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Additionally, specific features, structures, or characteristics may be combined in any manner in one or more embodiments.

Please refer to Figure 1. The curved display device 1 with fingerprint recognition function in the present invention is a display device with an under-screen fingerprint recognition function and a curved surface design. It can be a smart phone or a tablet computer, but is not limited to this. For display devices such as smart TVs. The curved display device 1 with the fingerprint recognition function defines a display area AA and a non-display area NAA located around the display area AA, where the display area AA is an area used by the curved display device 1 with the fingerprint recognition function for image display. The display area AA defines a fingerprint recognition area FIA. When the user places the fingerprint on the finger in the fingerprint recognition area FIA, the fingerprint recognition area FIA can identify the user's fingerprint to achieve the effect of fingerprint recognition.

Please refer to Figures 1, 2, 5 and 6. The curved display device 1 with fingerprint recognition function according to the present invention includes a curved display panel 10, a plurality of fingerprint recognition modules 20 and a flexible circuit board 30; wherein the curved display panel 10 includes a display surface 12 and a backside 14 opposite to the display surface 12. The backside 14 of the curved display panel 10 is provided with a plurality of fingerprint recognition modules 20, and the plurality of fingerprint recognition modules 20 are all set corresponding to the fingerprint recognition area FIA; where the fingerprint The area of the identification area FIA can be equivalent to the area of the plurality of fingerprint identification modules 20, or can be larger than the area of the plurality of fingerprint identification modules 20; wherein the flexible circuit board is electrically connected to the plurality of fingerprint identification modules 20; wherein the plurality of fingerprint identification modules 20 jointly perform the function of fingerprint recognition.

Please refer to FIG. 1 . Since a plurality of fingerprint recognition modules 20 are used to jointly perform the fingerprint recognition function, the area of each fingerprint recognition module 20 is smaller than the area of the fingerprint recognition area FIA. As the number of fingerprint recognition modules 20 increases, , the area of each fingerprint recognition module 20 will also be reduced, thereby reducing the size of the gap between each fingerprint recognition module 20 and the back 14 of the curved display panel 10, and reducing the possibility of generating bubbles.

In the description of each embodiment below, the direction from the back surface 14 of the curved display panel 10 to the display surface 12 is defined as the "upward" direction, and the direction from the display surface 12 of the curved display panel 10 to the back surface 14 is defined as the "upward" direction. "Down" direction, so for example, the display surface 12 of the curved display panel 10 in Figure 2 is the upper surface of the curved display panel 10, and the back 14 of the curved display panel 10 is the lower surface of the curved display panel 10; another example is shown in Figure 3 and FIG. 4 , since it has been described that the back 14 of the curved display panel 10 is provided with a plurality of fingerprint recognition modules 20 , it can be seen that the side of the curved display panel 10 in contact with the fingerprint recognition module 20 in FIG. 3 is the back of the curved display panel 10 14, that is, the lower surface of the curved display panel 10, so the side of the curved display panel 10 that is not in contact with the fingerprint recognition module 20 is the upper surface of the curved display panel 10, and the rest will not be described again.

Please refer to Figure 3. In one embodiment of the present invention, the curved display panel 10 includes a cover 100 and a display module 104. The display module 104 is disposed on the lower surface of the cover 100; the lower surface of the display module 104 is The lower surface of the curved display panel 10 is the back 14 of the curved display panel 10 . Therefore, the plurality of fingerprint recognition modules 20 are disposed on the lower surface of the display module 104 . The cover 100 is used to protect the fingerprint recognition module 100 . For each component below, the cover plate 100 can be made of various types of glass such as soda glass, aluminosilicate glass, alkali-free glass, etc., but is not limited thereto. The cover plate 100 can also be made of acrylic or transparent plastic; The display module 104 is used for screen display, and can be an organic light-emitting diode display module or a micro-light emitting diode display module, but is not limited to this, and can also be a liquid crystal display module; the display module 104 is It is installed on the lower surface of the cover 100 by means of optical glue. The optical glue can be solid transparent optical glue (Optical Clear Adhesive, OCA) or liquid transparent optical glue (Optical Clear Resin, OCR) with high light transmittance. Adhesive.

Please refer to FIG. 4 . In one embodiment of the present invention, the curved display panel 10 includes a cover 100 , a touch module 102 and a display module 104 . The touch module 102 is disposed on the lower surface of the cover 100 . The module 104 is disposed on the lower surface of the touch module 102; the material of the cover 100 can be various types of glass such as soda glass, aluminosilicate glass, alkali-free glass, etc., but is not limited thereto, and the material of the cover 100 can also be It can be acrylic or transparent plastic; the touch module 102 can be a self-capacitive touch module 102 or a mutual capacitive touch module 102, but is not limited to this and can also be other types of touch modules. 102; The display module 104 can be an organic light-emitting diode display module or a micro-light emitting diode display module, but is not limited to this, and can also be a liquid crystal display module; where the touch module 102 uses optical The display module 104 is disposed on the lower surface of the touch module 102 by means of optical glue. The optical glue can be a solid transparent optical glue or a liquid transparent optical glue. Glue and other adhesives with high transmittance.

Please refer to FIGS. 5 and 6 . In one embodiment of the present invention, the flexible circuit board 30 is electrically connected to a plurality of fingerprint recognition modules 20 . Compared with the general situation, each fingerprint recognition module 20 is electrically connected to a flexible strip. Compared with the circuit board 30, the present invention uses a flexible circuit board 30 to electrically connect the plurality of fingerprint identification modules 20, thereby reducing the number of flexible circuit boards 30 and increasing the space available for installing the plurality of fingerprint identification modules 20. .

In one embodiment of the present invention, the flexible circuit board 30 is further electrically connected to the fingerprint recognition integrated circuit, thereby enabling signal transmission between the fingerprint recognition integrated circuit and the fingerprint recognition module 20 . The fingerprint recognition integrated circuit is used for signal transmission. It analyzes and compares the received signals to achieve the fingerprint recognition function.

Please refer to Figures 3 and 4. In one embodiment of the present invention, each fingerprint recognition module 20 is an ultrasonic fingerprint recognition module. Each fingerprint recognition module 20 includes a thin film transistor substrate 200, a piezoelectric layer 202 and Electrode layer 204. A piezoelectric layer 202 is disposed on the lower surface of the thin film transistor substrate 200, and an electrode layer 204 is disposed on the lower surface of the piezoelectric layer 202. The flexible circuit board 30 is electrically connected to the thin film transistor substrate 200 and the electrode layer 204, thereby supplying the thin film transistor to the thin film transistor substrate 200. The crystal substrate 200 and the electrode layer 204 provide voltage signals. The material of the thin film transistor substrate 200 may be polyimide (PI), polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), etc. Soft material, so that the fingerprint recognition module 20 can be arranged according to the curvature of the back 14 of the curved display panel 10 to achieve the effect of being arranged to fit the curved surface; the material of the piezoelectric layer 202 can be polyvinylidene fluoride. , PVDF), poly-L-Lactic Acid (PLLA), polyvinylidenefluoride-trifluoroethylene (PVDF-TrFE), polyvinylidenefluoride-tetrafluoroethylene, lead zirconate titanate ( Lead zirconate titanate (PZT) and other piezoelectric materials or any combination thereof; the material of the electrode layer 204 can be aluminum (Al), silver (Ag), gold (Au), cobalt (Co), chromium (Cr), Copper (Cu), indium (In), manganese (Mn), molybdenum (Mo), nickel (Ni), neodymium (Nd), palladium (Pd), platinum (Pt), titanium (Ti), tungsten (W), Zinc (Zn), iron (Fe), indium tin oxide (ITO), indium zinc oxide (IZO), indium tin zinc oxide (ITZO), zinc oxide , ZnO), aluminum zinc oxide (AZO), cadmium tin oxide (CTO), titanium oxide (TiO), poly(3,4-ethylenedioxythiophene) , PEDOT)), graphene, carbon nanotubes and other conductive materials or any combination thereof.

In one embodiment of the present invention, each fingerprint recognition module 20 is an ultrasonic fingerprint recognition module. When the user presses the fingerprint on the finger on the fingerprint recognition area FIA, the plurality of fingerprint recognition modules 20 will perform fingerprint recognition. The fingerprint recognition step includes a "transmitting step" and a "receiving step". In the "transmitting step", the flexible circuit board 30 will output different voltages to the thin film transistor substrate 200 and the electrode layer 204 respectively. Since the piezoelectric layer 202 It is located between the thin film transistor substrate 200 and the electrode layer 204, so a potential difference will be generated on both sides of the piezoelectric layer 202, so the piezoelectric layer 202 vibrates and emits ultrasonic waves through the piezoelectric effect; in the "receiving step", the soft circuit The plate 30 stops outputting voltage signals to the thin film transistor substrate 200 and the electrode layer 204, and the ultrasonic waves reflected by the fingerprint ridges and fingerprint grooves on the fingerprint are received by the piezoelectric layer 202, and then the piezoelectric layer 202 generates corresponding electrons through the piezoelectric effect. signal, then the electrode layer 204 transmits the electronic signal generated by the piezoelectric layer 202 to the thin film transistor substrate 200, and the thin film transistor substrate 200 collects and analyzes the received electronic signal, and then transmits it to the fingerprint through the flexible circuit board 30 Identify integrated circuits for analysis and comparison to achieve the fingerprint identification function.

In one embodiment of the present invention, each fingerprint recognition module 20 is an optical fingerprint recognition module, including a photodiode array, a collimation layer, etc., when the user presses the fingerprint on the finger to the fingerprint recognition area FIA , the curved display panel 10 will emit light to the fingerprint on the user's finger. The light will be reflected by the fingerprint ridges and grooves on the fingerprint to form reflected light, or it will be scattered internally by the finger to form scattered light. Reflected light and scattering The light is received by the photodiode array in the fingerprint recognition module 20 and converted into corresponding electronic signals, and is transmitted to the fingerprint recognition integrated circuit through the flexible circuit board 30 for analysis and comparison to achieve the fingerprint recognition function.

Please refer to FIGS. 1 , 2 , 5 and 6 . In one embodiment of the present invention, a plurality of fingerprint recognition modules 20 are arranged in an array on the back 14 of the curved display panel 10 , or are staggered in adjacent rows and columns. The arrangement is arranged on the back surface 14 of the curved display panel 10 , but is not limited to this, and it can also be arranged in a random arrangement on the back surface 14 of the curved display panel 10 . The plurality of fingerprint recognition modules 20 are disposed on the back 14 of the curved display panel 10 by optical glue, and the optical glue is filled between each fingerprint recognition module 20 and the back 14 of the curved display panel 10 , thus reducing The gap between each fingerprint recognition module 20 and the back 14 of the curved display panel 10 reduces the possibility of bubbles; the optical glue can be an adhesive with high light transmittance such as solid transparent optical glue or liquid transparent optical glue.

To sum up, the present invention provides a curved display device with a fingerprint recognition function, which can reduce the possibility of bubbles being generated when the fingerprint recognition module is disposed on the back of the curved display panel.

Each embodiment is only used to illustrate the content of the present invention and is not intended to limit the implementation scope of the present invention. Therefore, equal changes and modifications made according to the patentable scope of the present invention should still fall within the scope of the present invention.

1: Curved display device with fingerprint recognition function 10: Curved display panel 12:Display surface 14: Back 20:Fingerprint recognition module 30: Flexible circuit board 100:Cover 102:Touch module 104:Display module 200:Thin film transistor substrate 202: Piezoelectric layer 204:Electrode layer AA: display area NAA: non-display area FIA: fingerprint identification area

FIG. 1 is a schematic top view of a curved display device with a fingerprint recognition function according to an embodiment of the present invention.

Figure 2 is a schematic front view of a plurality of fingerprint recognition modules installed on the back of a curved display panel.

FIG. 3 is a schematic diagram of the stacking of a curved display panel and a fingerprint recognition module in an embodiment of the present invention, where the display panel includes a cover plate and a display module.

Figure 4 is a schematic diagram of the stacking of a curved display panel and a fingerprint recognition module in an embodiment of the present invention, where the display panel includes a cover plate, a touch module and a display module.

Figure 5 is a schematic top view of a plurality of fingerprint recognition modules arranged in an array.

Figure 6 is a schematic top view of a plurality of fingerprint recognition modules arranged in a staggered manner in adjacent rows and columns.

1: Curved display device with fingerprint recognition function

20:Fingerprint recognition module

AA: display area

NAA: non-display area

FIA: fingerprint identification area

Claims (6)

A curved display device with a fingerprint recognition function, including: a curved display panel defining a display area, the display area being curved, and a non-display area located around the display area, wherein the display area defines a fingerprint recognition area , and the curved display panel includes a display surface and a backside opposite to the display surface; a plurality of fingerprint recognition modules are provided on the backside of the curved display panel, the backside is curved and is set corresponding to the fingerprint recognition area, There is a gap between each fingerprint recognition module; and a flexible circuit board is electrically connected to the plurality of fingerprint recognition modules; wherein an optical glue is filled between the plurality of fingerprint recognition modules and the back surface of the curved display panel, and the A plurality of fingerprint recognition modules are arranged in an array on the back of the curved display panel. The curved display device with fingerprint recognition function as claimed in claim 1, wherein the plurality of fingerprint recognition modules are ultrasonic fingerprint recognition modules or optical fingerprint recognition modules. The curved display device with fingerprint recognition function as described in claim 2, wherein the fingerprint recognition module is an ultrasonic fingerprint recognition module, the fingerprint recognition module includes: a thin film transistor substrate disposed on the curved display panel the back surface; a piezoelectric layer disposed on the lower surface of the thin film transistor substrate; and an electrode layer disposed on the lower surface of the piezoelectric layer; wherein the flexible circuit board is electrically connected to the thin film transistor substrate and the electrode layer. The curved display device with fingerprint recognition function as described in claim 3, wherein the material of the thin film transistor substrate is polyimide (PI), polyethylene terephthalate (PET) or Polyethylene naphthalate (PEN). The curved display device with fingerprint recognition function as claimed in claim 1, wherein the curved display panel includes: a cover; and a display module disposed on the lower surface of the cover, and the plurality of fingerprint recognition modules are provided on the lower surface of the display module. The curved display device with fingerprint recognition function as claimed in claim 1, wherein the curved display panel includes: a cover; a touch module disposed on the lower surface of the cover; and a display module disposed on The lower surface of the touch module, and the plurality of fingerprint recognition modules are arranged on the lower surface of the display module.

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