TWI710938B - Display - Google Patents

Abstract

A display with fingerprint sensor is disclosed. The display includes a transparent column body, an inner column body, a flexible display and a fingerprint sensor. The transparent column body contains an accommodating space and includes an axial outer surface and an axial inner surface. The inner column body is disposed in the accommodating space. In the first status, the flexible display is curled along the inner column body and stored in the accommodating space. In the second status, the flexible display is stretched from the inner column body to the outside of the transparent column body. The fingerprint sensor is disposed on the axial outer surface. A fingerprint sensing light from the axial inner surface is received to conduct the fingerprint recognition.

Description

monitor

The present invention relates to a display, especially to a flexible display with a fingerprint sensor.

Existing flexible displays, such as roll-to-roll displays, mainly include flexible panels and storage devices. Flexible panels include rollable or bendable display panels. This type of display panel can have The full-screen display function, when turned off or standby, with its flexibility, the display panel can be rolled or folded into the storage device, reducing the space occupied by the display panel and improving the convenience of carrying the overall display . The storage device can be a housing with different accommodating spaces, such as a square or rectangular housing, or a cylindrical or pen-shaped structure, but the same is provided with an opening on one side to increase flexibility. The panel is pulled out or retracted.

In the prior art, the flexible panel may have different rewinding methods according to different accommodating spaces during storage. However, when it is to be opened and used, most of the flexible panels will be provided with an unlocking function to increase operational safety. When the unlocking is successful Before the flexible panel can be pulled out for use, or after the flexible panel is pulled out first, it must be unlocked before the flexible panel can be used. Therefore, in the prior art, a lock structure design is added to the housing structure to increase operation safety, but the lock structure design will directly increase the volume and weight of the storage device, and there is still room for improvement.

In summary, the conventional scroll display still has considerable defects in the setting of the unlocking function and the safety of the actual operation. Therefore, the present invention designs a scroll display with a fingerprint sensor to address the prior art The defects should be improved to ensure that the safety performance of device identification meets the requirements, thereby enhancing the implementation and utilization in the industry.

In view of the above-mentioned problems of the prior art, the purpose of the present invention is to provide a scroll display with a fingerprint sensor, which has a multi-finger recognition mode and uses the existing structure and light source to form a multi-finger recognition area, thereby solving the existing scroll The security of the display is insufficient and the hardware installation cost is too high.

According to the above objective, an embodiment of the present invention provides a display. It includes a transparent columnar body, an inner columnar body, a flexible display and a fingerprint sensor. Wherein, the transparent columnar shape has an accommodating space, and the transparent columnar body includes an axial outer surface and an axial inner surface. The inner cylinder is arranged in the accommodating space and faces the axial inner surface. One side of the flexible display is connected to the inner column, and in the first state, the flexible display is crimped along the inner column and stored in the accommodating space, or in the second state, the flexible display is from the inner column The body stretches to the transparent cylindrical body. The fingerprint sensor is arranged on the outer surface of the axial direction, and receives the fingerprint sensing light source entering the inner surface of the axial direction to provide the fingerprint sensor for fingerprint recognition.

Specifically, the flexible display may include a flexible circuit board and a display panel. The display panel is arranged on the flexible circuit board. In the first state, the display panel and the flexible circuit board are overlapped and wound on the inner column. On the body, in the second state, the display panel is located between the flexible circuit board and the inner cylinder, and the fingerprint sensing light source is arranged on the flexible circuit board.

Specifically, the fingerprint sensor can sense at least two objects, and the areas occupied by the at least two objects are different.

Specifically, the inner cylinder may be eccentrically arranged, the inner cylinder has a first axis and the transparent cylinder has a second axis, and the distance from the first axis to the fingerprint sensor is smaller than the distance from the second axis to the fingerprint sensor. The distance of the detector.

Specifically, the fingerprint sensing light source may be arranged on the inner cylinder, facing the fingerprint sensor.

According to the above objective, another embodiment of the present invention provides a display. It includes a transparent columnar body, an inner columnar body, a flexible display and a fingerprint sensor. Wherein, the transparent columnar shape has an accommodating space, and the transparent columnar body includes an axial outer surface and an axial inner surface. The inner cylinder is arranged in the accommodating space and faces the axial inner surface. One side of the flexible display is connected to the inner cylinder, and in the first state, the flexible display is crimped along the inner cylinder and stored in the accommodating space, or in the second state, the flexible display is from the inner cylinder The body stretches to the transparent cylindrical body. The fingerprint sensor is arranged on the axial inner surface, and receives the fingerprint sensing light source from the accommodating space to provide the fingerprint sensor for fingerprint recognition.

In summary, according to the display disclosed in the embodiment of the present invention, the multi-finger fingerprint identification can be achieved through the multi-finger fingerprint identification area, which improves the identification security. At the same time, a fingerprint sensor is provided on the surface of a transparent cylinder, and an inner cylinder or a flexible display is used to provide a fingerprint sensing light source, which reduces the need for additional fingerprint sensing devices on the display and reduces hardware installation costs.

10, 11, 12, 13: display

20, 60: transparent cylinder

21: Housing space

22: opening

23: The first axis

201, 601: axial outer surface

202, 602: axial inner surface

30, 32, 70: inner cylinder

31: second axis

40: Flexible display

401: display panel

402: Flexible circuit board

50: Fingerprint sensor

51: Fingerprint recognition area

61: protective layer

90: hands

91: First Knuckle

92: Second Knuckle

93: finger

H: height

ITO: Transparent conductive film

M: Metal layer

M1: first state

M2: second state

R1, R2: distance

SRO: photosensitive layer

T: Transistor

W: width

In order to make the technical features, content and advantages of the present invention and the effects it can achieve more obvious, the present invention is combined with the accompanying drawings and described in detail in the form of embodiments as follows: Figure 1A and Figure 1B are A schematic diagram of a display according to an embodiment of the invention.

Figure 2 is a schematic diagram of the eccentric arrangement of the inner cylinder according to the embodiment of the present invention.

Figure 3 is a schematic diagram of the fingerprint sensing area of the embodiment of the present invention.

FIG. 4 is a schematic diagram of a display according to another embodiment of the invention.

FIG. 5A and FIG. 5B are schematic diagrams of the fingerprint sensor disposed on the axial inner surface of the embodiment of the present invention.

Fig. 6A and Fig. 6B are schematic diagrams showing the fingerprint sensor of the embodiment of the present invention arranged on the axial outer surface.

In order to understand the technical features, content and advantages of the present invention and its achievable effects, the present invention is described in detail in the form of embodiments with accompanying drawings as follows. The figures used therein are only For the purpose of illustrating and supplementing the description, it may not be the true proportions and precise configuration after the implementation of the present invention. Therefore, the proportions and configuration relationships of the attached drawings should not be interpreted or limited to the scope of rights of the present invention in actual implementation. Narrate.

In the drawings, the thickness or width of layers, films, panels, regions, light guides, etc. are exaggerated for the sake of clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected" to another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. Conversely, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements. As used herein, "connection" can refer to a physical and/or electrical connection. Furthermore, "electrically connected" or "coupled" may mean that there are other elements between two elements. In addition, it should be understood that although the terms "first", "second", and "third" may be used herein to describe each Such elements, components, regions, layers and/or sections are used to distinguish one element, component, region, layer and/or section from another element, component, region, layer and/or section. Therefore, it is only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or its sequence relationship.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have meanings commonly understood by those skilled in the art to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of related technologies and the present invention, and will not be interpreted as idealized or excessive The formal meaning, unless explicitly defined as such in this article.

Please refer to FIG. 1A and FIG. 1B at the same time, which are schematic diagrams of the display according to the embodiment of the present invention. Figure 1A is a schematic diagram of the display 10 in the first state M1, and Figure 1B is a schematic diagram of the display 10 in the second state M2. As shown in the figure, the display 10 includes a transparent cylindrical body 20, an inner cylindrical body 30, a flexible display 40 and a fingerprint sensor 50. The transparent cylindrical body 20 is formed of a light-transmitting material, such as transparent glass. In this embodiment, the transparent columnar body 20 is a cylinder, but the invention is not limited to this. In other embodiments, the transparent columnar body 20 may also be a polygonal columnar body. The transparent cylindrical body 20 has a hollow structure inside and has an accommodating space 21. The side surface of the transparent cylindrical body 20 includes an axial outer surface 201 and an axial inner surface 202. The axial inner surface 202 defines the transparent column In the accommodating space 21 inside the shaped body 20, a fingerprint sensor 50 is arranged on the axial outer surface 201 to form a fingerprint recognition area. The inner column 30 is disposed in the accommodating space 21 inside the transparent column 20, facing the axial inner surface 202, the inner column 330 can be a rotating reel, and the flexible display 40 can be rolled, stored, or pulled out. State transition

One side of the flexible display 40 is connected to the inner cylinder 30. As shown in Figure 1A, when the display 10 is in the first state M1, the flexible display 40 is crimped and stored in the accommodating space 21, and the display 10 can be in In the standby state, when the user needs to operate the display 10 to display the screen, it needs to be unlocked first The program can pull the flexible display 40 out of the opening 22 to form the second state M2 as shown in FIG. 1B. In the unlocking procedure described in this embodiment, the user holds the display 10, places four fingers other than the thumb on the fingerprint recognition area of the fingerprint sensor 50, and the fingerprint sensor 50 recognizes the user’s fingerprint. Check whether it is a qualified user through comparison. If the user is recognized as the correct user, the flexible display 40 will display the startup screen or the screen from the previous shutdown. If the user is recognized as an unregistered user, the flexible display 40 will The display 40 maintains a standby state, or the transparent cylindrical body 20 can be provided with a locking structure, and the flexible display 40 cannot be pulled out when the unlocking is not successful.

In this embodiment, the fingerprint sensing light source can be disposed on the flexible display 40. As shown in the figure, the flexible display 40 includes a display panel 401 and a flexible circuit board 402, and the display panel 401 is disposed on the flexible circuit. On the board 402, and the display surface of the display panel 401 faces the inner cylinder 30, when in the first state M1, the display panel 401 is crimped and stored along the inner cylinder 30, so that the flexible circuit board 402 is transparent to the outside The axial inner surface 202 of the cylindrical body 20. The flexible circuit board 402 includes pixel circuits for displaying images and a backlight source. The backlight source may be a self-luminous element. In addition to being originally used as a light source for providing the display panel 401 for displaying images, it may also be used as a fingerprint sensor light source. Since the flexible display 40 is arranged relative to the inner cylinder 30 in such a way that the flexible circuit board 402 is arranged on the outside, that is, toward the axial inner surface 202 of the transparent cylinder 20, the backlight and the transparent cylinder can be shortened. The distance between the fingerprint sensor 50 on the axial outer surface 201 of the axis 20 improves the sensitivity of fingerprint sensing. In addition, since the fingerprint sensor 50 is arranged on the axial outer surface 201 of the first cylindrical body 20, its arrangement position can overlap the thin film transistor of the display panel 401. In comparison, the fingerprint sensor 50 is currently The sensor is arranged on the display panel, and the fingerprint sensor and the thin film transistor of the display panel and other opaque elements are arranged side by side, which will reduce the aperture ratio. Therefore, this embodiment also has the advantage of increasing the aperture ratio of the display panel 401.

In addition, when the flexible display 40 is pulled out to be in the second state M2, if the display 10 enters the standby state and needs to be unlocked again, the flexible display 40 has been completely pulled out of the transparent column 20 at this time. The backlight of the flexible circuit board 402 cannot be provided as a sensing light source. The display 10 can be designed with a retractable structure, using a button or spring structure to roll the flexible display 40 back to a preset length, so that the backlight is directed to the fingerprint sensor 50 again, and then a fingerprint sensing light source is provided for fingerprint recognition and unlocking purpose.

Please refer to Fig. 2, which is a schematic diagram of the eccentric arrangement of the inner cylinder according to the embodiment of the present invention. As shown in the figure, the display 10 includes a transparent column 20 and an inner column 30. The inner column 30 is disposed in the accommodating space 21. One side of the flexible display 40 is connected to the inner column 30 and includes a display panel 401 And the flexible circuit board 402, the same parts as the above-mentioned embodiment will not be repeated. In this embodiment, the inner cylinder 30 is not arranged in the center of the accommodating space 21. The transparent cylinder 20 has a first axis 23 and the inner cylinder 30 has a second axis 31. The first axis 23 and the first axis The two shaft centers 31 are not arranged overlappingly, and the inner cylinder 30 is arranged in an eccentric manner. Taking the axial outer surface 201 of the transparent cylindrical body 20 as the position where the fingerprint sensor 50 is arranged, the distance R1 from the first axis 23 to the fingerprint sensor 50 on the axial outer surface 201 is greater than the second axis 31 to The distance R2 of the fingerprint sensor 50 on the axial outer surface 201. In other words, the second axis 31 is closer to the fingerprint sensor 50. When the flexible circuit board 402 of the flexible display 40 is used as a fingerprint sensing light source, it can be closer to the fingerprint sensor 50 to improve the sensitivity of identification. On the other hand, the space vacated by the accommodating space 21 can also be used as a location for other components such as batteries and circuit boards of the display 10 to improve the utilization of the internal space of the device.

Please refer to FIG. 3, which is a schematic diagram of the fingerprint sensing area of the embodiment of the present invention. As shown in the figure, the scroll display 10 includes a transparent column 20, an inner column 30, and a flexible display 40. The flexible display 40 includes a display panel 401 and a flexible circuit board 402. The same parts as those in the above embodiment are different. Repeat the description. In this embodiment, the fingerprint sensor forms a fingerprint recognition area 51 on the axial outer surface of the transparent cylindrical body 20, and the flexible circuit board 402 of the flexible display 40 is used as a fingerprint sensor light source. The user's hand 90 performs fingerprint recognition to perform the unlocking procedure. The fingerprint sensing area 51 can sense at least two objects, that is, fingerprints of at least two different knuckles of the finger (for example, the first knuckle 91 and the second knuckle 92 of the finger), due to the length and width of the finger knuckles It is not the same, and the area occupied by at least two objects sensed is also different. The width W and height H of the entire fingerprint recognition area 51 may be 45×45 mm (for example, the area of the first knuckle 91 and the second knuckle 92 of two fingers). In a preferred embodiment, the width W and height H can be 45×90 mm (for example, the area of the first knuckle 91 and the second knuckle 92 of four fingers). In this embodiment, when the user's hand 90 holds the display 10, the four fingers from the index finger to the little finger can hold the fingerprint recognition area 51 and recognize the four fingers at the same time. Compared with fingerprint recognition of a single finger, multi-finger fingerprint recognition can significantly increase the identification feature points and improve the security of recognition, and is suitable for applications such as financial transactions and shopping with higher security requirements.

Please refer to FIG. 4, which is a schematic diagram of a display according to another embodiment of the present invention. As shown in the figure, the scroll display 11 includes a transparent cylindrical body 20, an inner cylindrical body 32, a flexible display 40, and a fingerprint sensor 50. The transparent cylindrical body 20 is formed of a light-transmitting material. In this embodiment, the transparent The cylindrical body 20 is a cylindrical body with a hollow structure inside, forming a accommodating space 20 for the inner cylindrical body 32. The side surface of the transparent cylindrical body 20 includes an axial outer surface 201 and an axial inner surface 202, and an axial inner surface 202 The accommodating space 21 inside the transparent cylindrical body 20 is defined, and the fingerprint sensor 50 is arranged on the axial outer surface 201. The flexible display 40 can be rolled around the inner column 32 and stored in the accommodating space 21. Different from the previous embodiment, the fingerprint sensing light source of this embodiment is arranged on the inner cylinder 32, and the fingerprint sensing light source is directed from the accommodating space 21 to the fingerprint sensor 50 as the sensing light source for fingerprint recognition. The light source is provided on the inner cylinder 32 itself because in the second state M2, the flexible display 40 is pulled out, originally used as a fingerprint sensor light source The backlight source has been pulled out of the transparent cylindrical body 20 and can no longer be used as a fingerprint sensing light source. Therefore, the inner cylindrical body 32 itself is set as a light source. When the flexible display 40 is pulled out, the scroll display 11 can also have fingerprint recognition Features. For example, when the display screen has not been operated for a period of time and enters the standby state, the setting of this embodiment can be used to perform the unlocking procedure through fingerprint recognition again and return to the original display state.

In this embodiment, since the fingerprint sensing light source is disposed on the inner cylinder 32, when the flexible display 40 is originally stored in the accommodating space 21, the flexible display 40 surrounds the inner cylinder 32 and reduces the sensitivity of sensing. Therefore, in addition to the foregoing case where the flexible display 40 is pulled out before unlocking, it can also be used in combination with the foregoing embodiments. For example, in the first state M1, the backlight of the flexible circuit board of the flexible display 40 is used. The light source is used as the fingerprint sensing light source, and in the second state M2, the light source of the inner cylinder 32 is used as the fingerprint sensing light source.

In another embodiment, the fingerprint sensor 50 receives the external quantum efficiency (External Quantum Efficiency) of the light, that is, the ratio of the maximum number of electrons of the output photocurrent to the number of incident photons is as large as possible. Therefore, the inner cylinder 32 The fingerprint sensing light source can be set as an adjustable wavelength light source. For example, in the different usage scenarios of the first state M1 and the second state M2, the fingerprint sensing light source can be adjusted to a specific light source wavelength, or dual light sources with different wavelengths can be used to make the fingerprint The sensor 50 can receive a sensing light source of a specific wavelength, which increases the sensitivity of sensing, thereby improving the accuracy of fingerprint recognition and improving the security level.

Please refer to FIG. 5A and FIG. 5B at the same time, which are schematic diagrams of the fingerprint sensor disposed on the axial inner surface of the embodiment of the present invention. As shown in FIG. 5A, the display 12 includes a transparent cylindrical body 60 and an inner cylindrical body 70. The inner cylindrical body 70 is disposed in the accommodating space inside the transparent cylindrical body 60. As described in the foregoing embodiment, the inner cylindrical body 70 Set the light source itself, and use this light source as the fingerprint sensor light source. In this embodiment, the transparent cylindrical body 60 can be made of transparent glass material, which includes an axially outer surface 601 and The axial inner surface 602 of the surface 601, the fingerprint sensor is arranged on the axial inner surface 602, which can be directly fabricated on the axial inner surface 602, or the fingerprint sensor module can be made first and then attached to the shaft On the inner surface 602. FIG. 5B is a schematic diagram of the structure of the fingerprint sensor. A buffer layer and a transistor T, a transparent conductive film ITO, a photosensitive layer SRO, and a metal layer M are sequentially arranged on the axial inner surface 602. When the user's finger 93 is placed in the fingerprint recognition area, the fingerprint sensing light source provided by the inner cylinder 70 is sent to the finger 93 through the light-transmitting part. Because the fingerprint has a concave-convex pattern, the reflection of light on the hills and valleys is different , The reflected light sends out different electrical signals through the transparent conductive film ITO, the photosensitive layer SRO and the metal layer M to present fingerprint characteristics. In this embodiment, the photosensitive layer SRO is a silicon-rich oxide layer (Silicon-rich oxide) as an example, but the present invention is not limited to this. In other embodiments, amorphous silicon (a-Si), PIN Photodiodes and the like serve as the photosensitive layer. Similarly, in addition to indium tin oxide (ITO), the transparent conductive layer ITO can also be indium zinc oxide (IZO), aluminum zinc oxide (AZO), indium aluminum oxide (AIO), indium oxide (InO) or other transparent conductive materials .

Please refer to FIG. 6A and FIG. 6B at the same time, which are schematic diagrams of the fingerprint sensor disposed on the axial outer surface of the embodiment of the present invention. As shown in FIG. 6A, the display 13 includes a transparent cylindrical body 60 and an inner cylindrical body 70. The inner cylindrical body 70 is disposed in the accommodating space inside the transparent cylindrical body 60. Same as the previous embodiment, the inner cylindrical body 70 itself Set up a light source, and use this light source as a fingerprint sensor light source. In this embodiment, the transparent cylindrical body 60 can be made of transparent glass, which includes an axial outer surface 601 and an axial inner surface 61 opposite to the axial outer surface 601. The fingerprint sensor is arranged on the axial outer surface On 601, it can be directly fabricated on the axial outer surface 601, or the fingerprint sensor module can be manufactured first and then attached to the axial outer surface 601. FIG. 6B is a schematic diagram of the fingerprint sensor structure. A buffer layer and a transistor T, a metal layer M, a photosensitive layer SRO, a transparent conductive film ITO, and a protective layer 61 are sequentially arranged on the axial outer surface 601. Since the fingerprint sensor is arranged on the outer surface 601 of the shaft, the protective layer 61 can prevent the finger 93 from directly contacting the fingerprint sensor structure, thereby providing higher durability. When the user's finger 93 is placed in the fingerprint recognition area, The fingerprint sensing light source provided by the inner cylinder 70 is sent to the finger 93 through the light-transmitting part, and the reflected light presents the difference between the peaks and valleys of the fingerprint. The transparent conductive film ITO, the photosensitive layer SRO and the metal layer M send out different electrical signals to present the fingerprint feature. Similar to the foregoing embodiment, the photosensitive layer SRO is an example of a silicon-rich oxide layer, but the present invention is not limited to this. In other embodiments, amorphous silicon (a-Si), PIN Photodiodes and the like serve as the photosensitive layer. Similarly, in addition to indium tin oxide (ITO), the transparent conductive layer ITO can also be indium zinc oxide (IZO), aluminum zinc oxide (AZO), aluminum oxide indium (AIO), indium oxide (InO) or other transparent conductive materials .

The above description is only illustrative, and not restrictive. Any equivalent modifications or alterations that do not depart from the spirit and scope of the present invention should be included in the scope of the attached patent application.

10: display

20: Transparent columnar

21: Housing space

201: Axial outer surface

202: axial inner surface

30: inner cylinder

40: Flexible display

401: display panel

402: Flexible circuit board

50: Fingerprint sensor

M1: first state

Claims (11)

A display includes: a transparent columnar body with an accommodating space, and the transparent columnar body includes an axial outer surface and an axial inner surface; an inner columnar body arranged in the accommodating space, Facing the axial inner surface; a flexible display, one side of which is connected to the inner cylinder, and in a first state, the flexible display is crimped along the inner cylinder to be stored in the accommodation Space, or in a second state, the flexible display is stretched from the inner cylinder to the outside of the transparent cylinder; and a fingerprint sensor is disposed on the axial outer surface and receives data from entering the A fingerprint sensing light source on the axial inner surface to provide the fingerprint sensor for fingerprint recognition; wherein the fingerprint sensing light source is arranged on a flexible circuit board of the flexible display or on the inner cylinder, Towards the fingerprint sensor. The display according to claim 1, wherein the flexible display includes the flexible circuit board and a display panel, the display panel is disposed on the flexible circuit board, and in the first state, the display The panel and the flexible circuit board are overlapped and wound on the inner cylinder, and in the second state, the display panel is located between the flexible circuit board and the inner cylinder. The display according to claim 2, wherein the inner cylinder includes a retracting device, and when the flexible display is fully drawn out in the second state, the retracting device restricts rolling back to the flexible display A predetermined area is reserved on the inner cylinder. The display according to claim 1, wherein the fingerprint sensor senses at least two objects, and the areas occupied by the at least two objects are different. The display according to claim 1, wherein the inner column system is eccentrically arranged, the inner column has a first axis, the transparent column has a second axis, and the first axis to the fingerprint The distance between the sensor is smaller than the distance between the second axis and the fingerprint sensor. The display according to claim 1, wherein a protective layer is provided on the fingerprint sensor. A display includes: a transparent columnar body with an accommodating space, and the transparent columnar body includes an axial outer surface and an axial inner surface; an inner columnar body arranged in the accommodating space, Facing the axial inner surface; a flexible display, one side of which is connected to the inner cylinder, and in a first state, the flexible display is crimped along the inner cylinder to be stored in the accommodation Space, or in a second state, the flexible display is stretched from the inner cylinder to the outside of the transparent cylinder; and a fingerprint sensor is disposed on the axial inner surface and receives from the container A fingerprint sensing light source in the set space to provide the fingerprint sensor for fingerprint recognition; wherein the fingerprint sensing light source is arranged on a flexible circuit board of the flexible display or arranged on the inner cylinder, facing the Fingerprint sensor. The display according to claim 7, wherein the flexible display includes the flexible circuit board and a display panel, the display panel is disposed on the flexible circuit board, and in the first state, the display The panel and the flexible circuit board are overlapped and wound On the inner cylinder, in the second state, the display panel is located between the flexible circuit board and the inner cylinder. The display according to claim 8, wherein the inner cylinder includes a retracting device, and when the flexible display is fully extended in the second state, the retracting device is restricted from being rolled back to the flexible display A predetermined area is reserved on the inner cylinder. The display according to claim 7, wherein the fingerprint sensor senses at least two objects, and the area occupied by the at least two objects is different. The display according to claim 7, wherein the inner column system is eccentrically arranged, the inner column has a first axis, the transparent column has a second axis, and the first axis to the fingerprint The distance between the sensor is smaller than the distance between the second axis and the fingerprint sensor.

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