WO2018120655A1

WO2018120655A1 - Self-emitting display panel, display module, and method of using display module

Info

Publication number: WO2018120655A1
Application number: PCT/CN2017/087645
Authority: WO
Inventors: 凌严; 朱虹
Original assignee: 上海箩箕技术有限公司
Priority date: 2016-12-29
Filing date: 2017-06-09
Publication date: 2018-07-05
Also published as: CN108255356A

Abstract

Provided are a self-emitting display panel, a display module, and a method of using a display module. The self-emitting display panel comprises a first substrate, a second substrate and a self-emitting circuit layer. The self-emitting circuit layer is positioned between the first substrate and the second substrate. The self-emitting circuit layer comprises a display region comprising a plurality of self-emitting display pixels. The display region comprises one or more optical fingerprint sensing regions. In the optical fingerprint sensing region, in every m×n self-emitting display pixels, each of k self-emitting display pixels has at least one optical fingerprint sensing element, where each of m and n is any integer greater than 1, and k is any integer between 1 and m×n. In the optical fingerprint sensing region, the self-emitting display pixel comprises an optically transmissive region and a non-optically transmissive region. The optical fingerprint sensing element is located at the non-optically transmissive region. The self-emitting display panel can cooperate with a corresponding backlight source to realize a fingerprint recognition function.

Description

Self-luminous display panel, display module and display module using method

The present application claims priority to Chinese Patent Application No. 201611245672.4, entitled "Self-Luminous Display Panel, Display Module, and Display Module Usage Method", which is filed on December 29, 2016, all of which are entitled The content is incorporated herein by reference.

Technical field

The present invention relates to the field of optoelectronic displays, and in particular, to a self-illuminating display panel, a display module, and a display module.

Background technique

Display modules are commonly used to display output information for electronic products. In the display module currently used for mobile terminals such as mobile phones, a finger touch sensing layer is usually integrated.

Among the various display modules, the display module with the self-luminous display panel is an important development direction of the current display module because it does not require a backlight, and is lighter and lighter.

However, on the one hand, the functions of the existing self-luminous display panel and the display module are still relatively simple. On the other hand, when the existing self-luminous display panel and the display module are integrated with other functional structures, the structure needs to be optimized.

Summary of the invention

The problem to be solved by the present invention is to provide a self-luminous display panel, a display module, and a display module, to increase the functions of the self-luminous display panel and the display module, and to enable different functions of the self-luminous display panel Better coordination and coordination, so that the different functions of the display module can be better coordinated.

In order to solve the above problems, the present invention provides a self-luminous display panel comprising a first substrate, a second substrate, and a self-luminous circuit layer, the self-luminous circuit layer being located between the first substrate and the second substrate; The self-illuminating circuit layer includes a display area, and the display area package a plurality of self-luminous display pixels; wherein: the display area includes one or more optical fingerprint sensing areas; and in the optical fingerprint sensing area, each of the m×n of the self-luminous display pixels, k Each of the self-luminous display pixels has at least one optical fingerprint sensing element, m and n are any integer of 1 or more, k is any integer from 1 to m×n; in the optical fingerprint sensing area The self-luminous display pixel includes a light transmissive area and a non-transparent area, and the optical fingerprint sensing element is located in the non-transparent area.

Optionally, in the optical fingerprint sensing area, a distance between adjacent optical fingerprint sensing elements is 30 μm to 100 μm.

Optionally, the self-luminous display pixel has a TFT device, and a gate of the TFT device is located above the semiconductor layer, and a light shielding layer is disposed under the semiconductor layer.

Optionally, the self-luminous display pixel has a TFT device, and a gate of the TFT device is located under the semiconductor layer, and a light shielding layer is disposed above the semiconductor layer.

Optionally, the light shielding layer is connected to a fixed potential.

In order to solve the above problems, the present invention further provides a display module comprising: the self-luminous display panel as described above; a dot backlight, the number of the dot backlights being greater than or equal to the optical fingerprint sensing The number of the regions, one of the optical fingerprint sensing regions uses at least one of the dot backlights for fingerprint image acquisition; the dot backlight is located obliquely below the optical fingerprint sensing region.

Optionally, the display module further includes a protective layer, the protective layer being located above the first substrate of the self-luminous display panel.

Optionally, the second substrate lower surface of the self-luminous display panel further includes a light anti-reflection layer, and the light-transmitting layer is located below the optical fingerprint sensing area, and the light anti-reflection layer can be increased. The proportion of light from the point backlight entering the optical fingerprint sensing area.

In order to solve the above problems, the present invention further provides a method for using a display module, the display module being as described above; the using method includes: when detecting that at least one of the optical fingerprint sensing regions is pressed by a finger Controlling the optical fingerprint sensing area pressed by the finger to perform finger fingerprint image collecting work, and controlling the optical fingerprint sensing area pressed by the finger The self-luminous display pixel stops emitting light.

Optionally, controlling an area of the display module that is not pressed by a finger displays information associated with fingerprint recognition.

Optionally, the optical fingerprint sensing area pressed by one finger is one, and the point backlight corresponding to the optical fingerprint sensing area is only one, and the point backlight is controlled. The fingerprint image of the finger is collected.

Optionally, the optical fingerprint sensing area pressed by one finger is one, and the point backlights corresponding to the optical fingerprint sensing area are two or more; and any one of the point backlights is controlled. Collecting a fingerprint image of the finger, or controlling the two or more of the dot-like backlights to be turned on in turn to take a fingerprint image of the finger from different directions in turn.

Optionally, the optical fingerprint sensing area pressed by one finger is two or more, and the point backlight corresponding to each of the optical fingerprint sensing areas is one, and each of the optical fingerprints is controlled. The point-shaped backlight of the measuring area collects a partial fingerprint image of the finger, and each part of the fingerprint image collected from the two or more optical fingerprint sensing areas is merged into a fingerprint image of the finger.

Optionally, the optical fingerprint sensing area pressed by one finger is two or more, and the point backlights corresponding to each of the optical fingerprint sensing areas are two or more, and each of the opticals is controlled. The point-shaped backlight of the fingerprint sensing area is turned on in turn to collect part of the fingerprint image of the finger from different directions in turn, and the fingerprint images collected from the two or more optical fingerprint sensing areas are merged into The fingerprint image of this finger.

Optionally, the display module is simultaneously pressed by two or more fingers.

Optionally, the self-luminous display panel has a touch layer, or a touch layer is disposed above the self-light-emitting display panel, and the touch layer is used to detect a pressed position of a finger on a surface of the display area.

Compared with the prior art, the technical solution of the present invention has the following advantages:

In the technical solution of the present invention, in the optical fingerprint sensing area of the self-luminous display panel, a corresponding optical fingerprint sensing element is disposed in the self-luminous display pixel, and the self-luminous display pixel of the optical fingerprint sensing area is further disposed. The light transmissive area is provided (the light transmissive area is usually located around the optical fingerprint sensing element), and therefore, a method such as providing a point backlight under the self-luminous display panel can be utilized to achieve the use of the optical fingerprint sensing element pair The purpose of the fingerprint image acquisition is to realize the fingerprint recognition function, and at the same time, the self-luminous display panel can realize the fingerprint recognition function in cooperation with the corresponding backlight on the premise that the self-luminous display panel can display.

In the technical solution of the present invention, the display module provides a point backlight disposed obliquely below the optical fingerprint sensing area of the self-luminous display panel, so that the light emitted by the point backlight can be obliquely upward. The angle enters the second substrate, and then passes through the self-illuminating circuit layer through the light-transmitting region of the self-illuminating circuit layer, and continues to reach the first substrate, and the reflection and refraction of the finger fingerprint occurs on the surface of the first substrate When the optical phenomenon is generated, the corresponding reflected light can be returned to the first substrate, and then enters the corresponding optical fingerprint sensing component from the first substrate, and is received by the optical fingerprint sensing component to generate a corresponding electrical signal, thereby enabling fingerprint image acquisition. .

DRAWINGS

1 is a schematic top plan view of a display area of a self-luminous display panel according to an embodiment of the present invention;

2 is a schematic diagram of a display module according to an embodiment of the present invention;

3 is a schematic structural view of a first TFT in the display module shown in FIG. 2;

4 is a schematic structural view of a second TFT in the display module shown in FIG. 2;

FIG. 5 is a schematic diagram of a display module according to another embodiment of the present invention; FIG.

6 is a schematic structural diagram of a method for using a display module according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another method for using a display module according to an embodiment of the present invention; Figure.

detailed description

As described in the background art, the functions of the existing display modules are still relatively simple, and the structure needs to be optimized when integrated with the structure of other functions.

To this end, the present invention provides a new self-luminous display panel, which is combined with a corresponding point-like backlight to form a corresponding display module, so that the display module has a good fingerprint collection function, and Optimizing the integrated structure makes the fingerprint recognition function of the display module stronger. In addition, the display function of the display module and the fingerprint recognition function are further used together to achieve a better user experience.

The above described objects, features, and advantages of the present invention will be more apparent from the aspects of the invention.

The context in this specification is defined by placing the display panel under the eyes of the user. That is, in the display panel, if one structure is located above the other structure, this structure is closer to the user's eyes than the other structure when the display panel is placed under the user's eyes. At the same time, the area of each structure mentioned in this specification is usually the corresponding structural area seen from the user's eyes looking down. Explain together here.

A first embodiment of the present invention provides a self-luminous display panel. Referring to FIG. 1 , the self-luminous display panel has a self-luminous circuit layer, and the self-luminous circuit layer includes a display area 1 (ie, the self-luminous display panel includes the display area 1). The top view shape of the display area 1 is as shown by the largest rectangle in FIG.

In this embodiment, the self-luminous display panel is an OLED display panel. For more information about the OLED display panel, refer to the corresponding content of other embodiments in this specification.

1 is a top view of a display area of a self-luminous display panel. Therefore, the first substrate, the second substrate, the self-luminous circuit layer, and the sealing structure included in the self-luminous display panel are not shown. Refer to the corresponding content of other subsequent embodiments of this specification.

In this embodiment, the display area 1 includes an optical fingerprint sensing area 10, and the optical fingerprint sensing area 10 is surrounded by a large dotted frame for highlighting. The area of the optical fingerprint sensing area 10 is smaller than the area of the display area 1, that is, the optical fingerprint sensing area 10 is only a part of the display area 1.

In other embodiments, when the display area includes only one optical fingerprint sensing area, the area of the optical fingerprint sensing area and the area of the display area may be equal, that is, the area where the entire display area 1 is located is also the optical fingerprint sensing. The area where the district is located.

In other embodiments, the display area may also include a plurality of (two or more) optical fingerprint sensing areas. At this time, each optical fingerprint sensing area is a part of the display area, and the total of all the optical fingerprint sensing areas may be the display area or may be smaller than the display area.

With continued reference to FIG. 1, the display area 1 includes a plurality of self-luminous display pixels 10a, and the self-luminous display pixels 10a are generally arranged in a matrix (array). Therefore, in the optical fingerprint sensing area 10, a plurality of self-luminous display pixels 10a arranged in a row and column are also included. It should be noted that only the self-luminous display pixel 10a in the optical fingerprint sensing area 10 is shown in FIG. 1, and the self-luminous display pixel not located in the optical fingerprint sensing area 10 is not shown.

In the embodiment, in the optical fingerprint sensing area 10, one of the 2 x 2 self-luminous display pixels 10a has one optical fingerprint sensing element 10a1 (the optical fingerprint sensing element 10a1 is The photoelectric conversion device may be, for example, a photodiode or the like). In Fig. 1, a set of 2 x 2 self-luminous display pixels 10a are framed by a dashed box A (small dashed box) to enhance display. The same is true for every other 2 × 2 self-luminous display pixels 10a.

In this embodiment, each of the self-luminous display pixels 10a may have a single pixel structure, that is, the self-luminous display pixels 10a do not include sub-pixels. At this time, the optical fingerprint sensing element 10a1 can be formed at an appropriate position of the self-luminous display pixel 10a. In other embodiments, the self-luminous display pixel 10a may also include a plurality of sub-pixels (for example, three sub-pixels or four sub-pixels). In this case, the optical fingerprint sensing component 10a1 may be formed in an area other than each sub-pixel, or may be fabricated in Within a sub-pixel.

As can be seen from the above, in this embodiment, the optical fingerprint sensing element 10a1 is evenly distributed in the self-luminous display pixel 10a of the optical fingerprint sensing area 10. If the optical fingerprint sensing element 10a1 in the optical fingerprint sensing area 10 is separately viewed, The individual optical fingerprint sensing elements 10a1 are also arranged in rows and columns. In particular, in the present embodiment, each of the optical fingerprint sensing elements 10a1 is specifically formed in the first one of the 2 × 2 self-luminous display pixels 10a, that is, in the self-luminous display pixel 10a at the upper left corner position.

In other embodiments, in the optical fingerprint sensing area, each of the k self-luminous display pixels has at least one optical fingerprint sensing element, and m and n are any one or more. An integer, k is any integer from 1 to m × n. Under this premise, when k is equal to 1 (ie, one of the self-luminous display pixels has at least one optical fingerprint sensing element per m×n of the self-luminous display pixels), m and n are 1 or more. Any integer. The embodiment shown in FIG. 1 is a case where m and n are both equal to 2 and k is equal to 1.

In other embodiments, other cases than "m and n are 2 and k is 1" may be selected. For example, in other embodiments, each of the k self-luminous display pixels has at least one optical fingerprint sensing element per m×n of the self-luminous display pixels in the optical fingerprint sensing region. In this case, it may be further set that at least one of m and n is greater than 1, and k is less than m×n. For another example, it may be that each of the self-luminous display pixels has one optical fingerprint sensing element. As another example, each of the self-illuminating display pixels has a plurality (eg, two) of optical fingerprint sensing elements. For another example, each of the self-luminous display pixels of the odd-numbered rows has four optical fingerprint sensing elements, and each of the even-numbered rows has two optical fingerprint sensing elements. For another example, each of the self-luminous display pixels includes three sub-pixels, and one of the self-luminous display pixels has one optical fingerprint sensing element per 1×2 self-luminous display pixels. For another example, each of the self-illuminating display pixels includes three sub-pixels, and each of the two adjacent self-illuminating display pixels in the odd-numbered rows, one of the self-illuminating display pixels has two optical fingerprint sensing elements, and the other The illuminating display pixel has one optical fingerprint sensing element.

In this embodiment, in the optical fingerprint sensing area 10, the adjacent optical fingerprint sensing component 10a1 The distance between them is 30 μm to 100 μm. Since the grain pitch of the human fingerprint is generally around 200 μm, the optical fingerprint sensing element 10a1 which is too dense has no practical advantage. There are two important requirements when collecting fingerprint images: one is the resolution of the acquired image, that is, the distance between adjacent optical fingerprint sensing elements 10a1 in the optical fingerprint sensing area cannot be too large; the other is the collection area. To be large enough, it is necessary to collect a certain area of the fingerprint image to obtain enough fingerprint information. Therefore, the distance between the adjacent optical fingerprint sensing elements 10a1 is 30 μm to 100 μm. If the distance between them is too large, the fingerprint image resolution is insufficient and cannot be used for fingerprint recognition. If the distance between them is smaller, although the image resolution will be better, the effect of actual fingerprint recognition will not be significantly improved. Moreover, since the pixel size is reduced, when the fingerprint image of the same area is acquired, the data amount of the fingerprint image is increased, so that the image acquisition time is increased, the collection power consumption of the optical fingerprint sensing area is increased, and subsequent image processing is also performed. The time is getting longer.

In this embodiment, each of the self-luminous display pixels 10a of the optical fingerprint sensing area 10 includes at least one light transmissive area (not labeled) and at least one non-transmissive area (not labeled). The optical fingerprint sensing component 10a1 is located in the non-transmissive region, and the optical fingerprint sensing component 10a1 has the transparent region around the periphery. For more information about the non-transparent area and the transparent area, please refer to the corresponding contents of the subsequent embodiments.

In the self-luminous display panel provided in this embodiment, a corresponding optical fingerprint sensing component 10a1 is formed in the self-luminous display pixel 10a of the optical fingerprint sensing area 10, and the optical fingerprint sensing area 10 is disposed. The self-luminous display pixel 10a further has the light-transmissive area located around the periphery of the optical fingerprint sensing element 10a1. Therefore, a method such as providing a dot-shaped backlight under the self-luminous display panel can be utilized to achieve the use of the optical fingerprint sensing. The component 10a1 collects the fingerprint image to realize the fingerprint recognition function, and at the same time enables the self-luminous display panel to realize the fingerprint recognition function in cooperation with the corresponding backlight on the premise that the self-luminous display panel can display.

The embodiment of the invention further provides a display module, which is referred to FIG. 2 .

The display module includes a self-illuminating display panel (not labeled). For the majority of the structure of the self-luminous display panel, reference may be made to the corresponding content of the corresponding embodiment of FIG. 1. In this embodiment, The display area (not labeled) also includes only one optical fingerprint sensing area (not labeled), in which case the area of the display area is equal to the area of the optical fingerprint sensing area. The optical fingerprint sensing area has a plurality of self-luminous display pixels 1131 arranged in a row (the portion surrounded by the dotted frame in FIG. 2 shows the area where the self-luminous display pixel 1131 is located, but it should be noted that the dotted frame includes a part. The first substrate 111 and the second substrate 112, but this is only for convenience of display, the self-luminous display pixel 1131 does not include the first substrate 111 and the second substrate 112), and each of the self-luminous display pixels 1131 has an optical fingerprint. Sensing element 11311.

In other cases, the self-luminous display panel (for example, the display area of the self-luminous display panel is larger than the area of the optical fingerprint sensing area) may refer to other situations mentioned in the foregoing description.

2 is a schematic cross-sectional view of the display module, further showing that the self-luminous display panel includes a first substrate 111, a second substrate 112, and a self-luminous circuit layer 113. The self-luminous circuit layer 113 is located between the first substrate 111 and the second substrate 112. The self-luminous display panel further includes a sealing structure 114. The sealing structure 114 is also located between the first substrate 111 and the second substrate 112. The sealing structure 114, together with the first substrate 111 and the second substrate 112, seals the self-luminous circuit layer 113 between the first substrate 111 and the second substrate 112 to isolate air and moisture (water vapor) and the like in the environment.

FIG. 2 shows four self-luminous display pixels 1131 as representative. In the self-luminous display panel, the self-luminous circuit layer 113 includes a plurality of self-luminous display pixels 1131. As described above, the area in which the self-luminous display pixels 1131 are located and the adjacent relationship of the respective self-luminous display pixels 1131 are shown by dashed lines in FIG. Each of the self-luminous display pixels 1131 includes at least one non-transmissive region (not labeled) and at least one light transmissive region 11312. A light transmissive region 11312 is illustrated in FIG. 2 (ie, one of the light transmissive regions 11312 is located in FIG. 2 The range enclosed by the smallest dashed box is shown).

In this embodiment, the material of the first substrate 111 and the second substrate 112 may be a transparent material, and the specific material may be inorganic glass or organic glass, or may be other organic transparent resin than organic glass.

It should be noted that, in other embodiments, the light transmissive area of a self-luminous display pixel is further It can be connected with the light-transmissive area of another self-illuminating display pixel to form a wider transparent area. At this time, the two self-luminous display pixels are usually adjacent, and at this time, two self-illuminating The area between adjacent pixels of the display pixel is also a light transmitting area.

In this embodiment, the self-luminous display panel is an OLED display panel, and the self-luminous display pixel 1131 of the self-luminous circuit layer 113 may include an anode layer, a hole injection layer (HIL), an (organic) light-emitting layer (EML), and an electron. The injection layer (EIL), the cathode layer, and the like may further have a hole transport layer (HTL) and an electron transport layer (ETL), and may further include a TFT that drives the OLED, a driving metal line, a storage capacitor, and the like. The luminescence principle of the OLED display panel is: under a certain voltage driving, electrons and holes migrate from the cathode layer and the anode layer to the luminescent layer, respectively, and meet in the luminescent layer to form excitons and excite the luminescent molecules, and the luminescent molecules undergo radiation. Relaxation produces visible light (or other light). Wherein, the structure of the above-mentioned light-emitting layer or the like is located in the corresponding non-light-transmitting region. The self-luminous display pixel 1131 of the embodiment has a corresponding light transmissive area 11312 around the non-transparent area.

It should be particularly noted that in the non-transparent regions of the present embodiment and the foregoing embodiments, not the entire region is non-transparent from top to bottom. Rather, the bottoms of these regions have a non-transmissive structure such that photosensitive structures (eg, semiconductor layers or structures of optical fingerprint sensing elements 11311) located above the bottom non-transmissive structures can be protected by these non-transmissive structures, Affected by light from below. However, in the non-transmissive region, the structures above the photosensitive structures are still light transmissive so that the photosensitive structures can emit light from above or can receive light from above. For example, light emitted from the light-emitting layer can reach the user's eyes upward, and for example, the corresponding fingerprint-reflected light can propagate downward and be received by the optical fingerprint sensing area. In addition, other non-transmissive regions are caused by some structures that are not transparent to light. For example, some metal traces in the self-luminous circuit layer 113 are generally non-transmissive structures, and for example, TFTs in the self-luminous circuit layer 113. The gates included in the device are also typically non-transmissive.

It should be noted that, in this embodiment, the (organic) light-emitting layer may be located in the light-transmitting region or in the non-light-transmitting region. The light-emitting layer itself usually has a certain light transmissivity, and the electrode layer located above the light-emitting layer is usually also provided with a certain light transmittance, thereby ensuring The OLED display panel is displayed. However, in the application, in order to improve the light utilization efficiency of the OLED display panel, the electrode layer under the light-emitting layer is usually made opaque or even reflective, so that more light can be emitted from above, thereby improving brightness (this) When the luminescent layer is located in the non-transmissive region). The optical fingerprint sensing component 11311 is generally located in the non-transmissive region, that is, the optical fingerprint sensing component 11311 has a non-transmissive structure. However, as previously mentioned, the structure above the optical fingerprint sensing element 11311 generally has a better light transmission capability, so that the subsequent optical fingerprint sensing element 11311 can receive more light reflected from the fingerprint of the finger.

The display module further includes a dot backlight 120. The number of the dot backlights 120 is greater than or equal to the number of the optical fingerprint sensing regions, and one of the optical fingerprint sensing regions uses at least one of the dot backlights 120 for fingerprint image acquisition. The dot backlight 120 is located obliquely below the optical fingerprint sensing area, as shown in FIG.

In this embodiment, only one dot backlight 120 is employed. In other embodiments, more than two point backlights may be provided.

In this embodiment, the dot backlight 120 may be a dot LED lamp, and the light emitted by the dot LED lamp may be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light. Or white light.

In the embodiment, the self-luminous circuit layer 113 is formed on the second substrate 112, and the self-luminous circuit layer 113 and the first substrate 111 have a gap layer therebetween. And the void layer is filled with an inert gas such as nitrogen or argon to protect the self-luminous circuit layer 113 from being crushed by the first substrate 111.

In this embodiment, the height of the light-transmitting region 11312 is equal to the height of the self-light-emitting circuit layer 113, as shown in FIG. 2, that is, the light-transmitting region is a light-transmitting structure from the bottom to the top, thereby ensuring light can be transmitted from the light-transmitting region. The self-illuminating circuit layer 113 is passed through. (It should be noted that the height of each position of the self-illuminating circuit layer 113 may be slightly different, but the height of the self-illuminating circuit layer 113 at least a portion of the position is equal to the height of the light-transmitting region 11312). The light can pass through the self-illuminating circuit layer 113 from the light transmitting region, thereby ensuring that the display module can perform fingerprint image capturing by using the dot backlight 120 located under the self-luminous display panel. It can be seen from the content of the gap layer that the light passes through the self-luminous display panel, usually including the second The substrate 112, the light transmitting region 11312, the void layer, and the first substrate 111.

In this embodiment, on the basis of ensuring the corresponding structure and function of the self-luminous display pixel 1131, other structures of the self-luminous display pixel 1131 can be fabricated by using a light-transmitting structure as much as possible to increase the corresponding light-transmissive area. Further, the structure between the adjacent self-luminous display pixels 1131 can also be fabricated by using a light-transmitting structure as much as possible. At the same time, outside the display area where the self-luminous display pixels 1131 are located, for example, in the manufacturing position of the structure such as the driving circuit and the binding pin, the corresponding light-transmitting area can also be disposed, so that more light can pass through. A self-luminous display panel (here through which is generally referred to as passing through the height of the self-illuminating display pixel 1131, the height is also commonly referred to as thickness), such as an OLED display panel.

It should be noted that, although not shown in the figure, the lower surface of the second substrate 112 of the self-luminous display panel may further include a light anti-reflection layer, and the light anti-reflection layer is located below the optical fingerprint sensing area. The light anti-reflection layer can increase the proportion of light from the point backlight 120 into the optical fingerprint sensing area.

Please refer to FIG. 3. FIG. 3 is a schematic structural diagram of a first TFT in the display module shown in FIG. As shown in FIG. 3, the TFT structure is entirely located above the second substrate 112. First, there is a corresponding dielectric layer T11 above the second substrate 112, and the dielectric layer T11 is a multi-layer structure, which is fabricated through multiple processes. After the partial dielectric layer T11 is formed, the semiconductor layer T12 is formed, and then a portion of the dielectric layer T11 is formed to cover the semiconductor layer T12, and then the gate electrode T15 is formed. Finally, a portion of the dielectric layer T11 is formed to cover the gate electrode T15. The semiconductor layer T12 is electrically connected to the conductive structure T13 and the conductive structure T14, respectively, and the conductive structure T13 and the conductive structure T14 are used for connecting the source (not labeled) and the drain (not labeled) at both ends of the semiconductor layer T12, and the middle of the semiconductor layer T12 The area acts as a channel area. Located above the semiconductor layer T12 is a gate T15 having a portion of the dielectric layer T11 between the gate T15 and the semiconductor layer T12, and this portion of the dielectric layer T11 serves as a gate dielectric layer. Since the gate T15 is located above the semiconductor layer T12, the TFT structure is a top gate structure. At this time, the TFT structure further has a light shielding layer T10 under the semiconductor layer T12. The light shielding layer T10 serves to prevent the semiconductor layer T12 from being affected by the light transmitted from below. The TFT structure can be generally fabricated by a low temperature polysilicon process, or by an amorphous silicon process or an oxide semiconductor process.

In this embodiment, the light shielding layer T10 is electrically connected to a fixed potential (if the light shielding layer T10 is in a floating state, the potential of the light shielding layer T10 is unknown and may not be fixed. The light shielding layer T10 is also a back gate of the TFT, if shading If the potential of the layer T10 is unknown, the electrical properties of the TFT may be affected to ensure stable electrical performance of the TFT. Also, the area of the light shielding layer T10 is set larger than the area of the semiconductor layer T12, thereby better blocking the semiconductor layer T12.

Please refer to FIG. 4. FIG. 4 is a schematic structural diagram of a second TFT in the display module shown in FIG. As shown in FIG. 4, the TFT structure is entirely located above the second substrate 112. First, there is a corresponding dielectric layer T21 above the second substrate 112, and the dielectric layer T21 is a multi-layer structure, which is fabricated through multiple processes. After the partial dielectric layer T21 is formed, the semiconductor layer T22 is formed, and then the conductive structure T23 and the conductive structure T24 are formed, and finally a portion of the dielectric layer T21 is formed to cover the semiconductor layer T22. The semiconductor layer T22 is electrically connected to the conductive structure T23 and the conductive structure T24, respectively. The conductive structure T23 and the conductive structure T24 are used to connect the source (not labeled) and the drain (not labeled) of the semiconductor layer T22, and the middle of the semiconductor layer T22 The area is the channel area. Located below the semiconductor layer T22 is a gate T25, and the gate T25 may be directly formed on the surface of the second substrate 112. A portion of the dielectric layer T21 is provided between the gate T25 and the semiconductor layer T22, and this portion of the dielectric layer T21 functions as a gate dielectric layer. Since the gate T25 is located under the semiconductor layer T22, the TFT structure is a bottom gate structure. At this time, the TFT structure further has a light shielding layer T20 located above the semiconductor layer T22. The light shielding layer T20 serves to prevent the semiconductor layer T22 from being affected by the light transmitted from above. The TFT structure can be generally fabricated by an amorphous silicon process or an oxide semiconductor process, or can be fabricated by a low temperature polysilicon process.

In this embodiment, the light shielding layer T20 is electrically connected to a fixed potential (if the light shielding layer T20 is in a floating state, the potential of the light shielding layer T20 is unknown and may not be fixed. The light shielding layer T20 is also a back gate of the TFT, if shading If the potential of the layer T20 is unknown, the electrical properties of the TFT may be affected) to ensure stable electrical performance of the TFT. Also, the area of the light shielding layer T20 is set larger than the area of the semiconductor layer T22, thereby better shielding the semiconductor layer T22.

In the display module provided in this embodiment, the dot backlight 120 is located obliquely below the optical fingerprint sensing area of the self-luminous display panel (below the side, that is, when viewed from the top down, the dot backlight 120 is located The light emitted by the point backlight 120 can enter the second substrate 112 at an obliquely upward angle and then pass through the light transmissive area of the self-illuminating circuit layer 113. The self-luminous circuit layer 113 continues to reach the first substrate 111 (in the process from the self-luminous circuit layer 113 to the first substrate 111, usually passes through the above-mentioned void layer), and occurs on the surface of the first substrate 111 with the finger The optical phenomenon such as reflection and refraction of the fingerprint, the corresponding reflected light generated can be returned to the first substrate 111, and then enters the corresponding optical fingerprint sensing component 11311 from the first substrate 111, and is received (absorbed) by the optical fingerprint sensing component 11311, resulting in Corresponding electrical signals enable the acquisition of fingerprint images (the corresponding light is shown by the black arrow in Figure 2, where the partial refraction of the light is omitted).

In the display module provided in this embodiment, the optical fingerprint sensor is equivalent to being integrated in a self-luminous display panel (for example, an OLED display panel). In one aspect, the upper and lower substrates (the first substrate 111 and the second substrate 112) of the self-luminous display panel are each a light-transmitting substrate, and the optical fingerprint sensing element 11311 is integrated in the self-illuminating circuit layer; A dot-shaped backlight 120 is disposed under the self-luminous display panel, and when the fingerprint image is captured, only the point-shaped backlight 120 located under the self-luminous display panel is used as a light source for fingerprint image acquisition, instead of using the self-luminous display panel itself. The self-luminous display pixel 1131 serves as a light source for fingerprint image acquisition. This is because when the self-luminous display pixel 1131 is directly used as the light source, the light emitted from the light-emitting display pixel 1131 is usually stray light and interferes with each other. In addition, a plurality of self-luminous display pixels 1131 may accentuate the interference of such light. Therefore, when the thickness of the first substrate of the self-luminous display panel itself is large, or the thickness of the applied protective layer (see the subsequent embodiment of the protective layer) is large, if the self-luminous display pixel 1131 is directly used as the light source, the light rays are mutually The interference effect will make the collected fingerprint image blurred and unable to obtain a clear fingerprint image. Generally, the thickness of the first substrate, or the total thickness of the "first substrate and the applied protective layer", needs to be only 0.4 mm or more, and this structure cannot obtain a clear fingerprint image.

The display panel of the embodiment utilizes an optical fingerprint located on the self-luminous display panel. The point backlight 120 obliquely below the sensing area serves as a light source, and the light emitted by the point backlight 120 (specifically, the LED lamp) can have better homogeneity, and thus, a clearer fingerprint image quality can be obtained. Even if the thickness of the corresponding first substrate, or the total thickness of the "first substrate and the applied protective layer" is 10 mm or even greater than 10 mm, there is no problem that the fingerprint image is blurred, and the fingerprint recognition performance of the display module is improved.

In the display module provided by the embodiment of the invention, the optical fingerprint recognition function is integrated in the self-luminous display panel, and the subsequent corresponding use method can realize the collection in the display area (ie, the display area) of the display module. The fingerprint image can reduce the appearance size of the electronic product to which the display panel is applied, increase the screen ratio of the electronic product, and improve the appearance of the electronic product (for example, the screen ratio of the mobile phone product can be improved, and the appearance of the mobile phone product can be improved. degree).

The embodiment of the present invention further provides another display module. The cross-sectional view of the display module is as shown in FIG. 5. However, the structure of the display module is the same as that of the previous embodiment, and reference may be made to the corresponding content of the corresponding embodiment.

Referring to FIG. 5 , the display module includes a self-luminous display panel, and the self-luminous display panel includes a first substrate 221 , a second substrate 222 , and a self-luminous circuit layer 223 . The self-luminous circuit layer 223 is located between the first substrate 221 and the second substrate 222. The self-luminous display panel also includes a sealing structure 224. The sealing structure 224 is also located between the first substrate 221 and the second substrate 222. The sealing structure 224, together with the first substrate 221 and the second substrate 222, seals the self-luminous circuit layer 223 between the first substrate 221 and the second substrate 222. For more details, refer to the corresponding content of the foregoing embodiment.

In this embodiment, the self-luminous display panel has two optical fingerprint sensing regions (not labeled). As shown in FIG. 5, two optical fingerprint sensing regions are distinguished by a dotted line. The dot backlights corresponding to each of the optical fingerprint sensing regions are located obliquely below the respective optical fingerprint sensing regions, and the two dot backlights are a dot backlight 231 and a dot backlight 232, respectively.

FIG. 5 shows two self-luminous display pixels 2231 in the two optical fingerprint sensing regions. The self-luminous circuit layer 223 includes a plurality of self-luminous display pixels 2231. The self-luminous display pixel 2231 is shown by a dashed box in FIG. The area, and the respective self-luminous display pixels 2231 are adjacent to each other. Each of the self-luminous display pixels 2231 includes at least one non-transmissive region (not labeled) and at least one light transmissive region 22312, and a light transmissive region 22312 is illustrated in FIG. 5 (ie, one of the light transmissive regions 22312 is in a range as shown in FIG. 5 The range enclosed by the smallest dashed box is shown). The non-transparent area of the self-luminous display pixel 2231 has an optical fingerprint sensing element 22311. For more details, refer to the corresponding content of the foregoing embodiment.

In this embodiment, the display module further includes a protective layer 210 located above the self-luminous display panel. Since the protective layer 210 is provided, the structure directly pressed by the finger is converted from the first substrate to the protective layer 210, and accordingly, the corresponding light propagation process increases the process of passing through the protective layer 210 (the dot backlight 231 and the dot backlight 232). The corresponding light emitted, and the resulting reflected light of the fingerprint are shown by the black arrows in Fig. 5, in which the partial refraction of the light is omitted.

In this embodiment, the entire self-luminous display panel is divided into a plurality of regions, and the difference includes a plurality of optical fingerprint sensing regions, and different dot backlights in different regions. At this time, the touch of the display module can be The control function (that is, in the embodiment, the display module is a display module integrated with a touch function) detects the pressing area of the finger, and correspondingly activates the point backlight of the corresponding area, and the corresponding optical fingerprint sensing area Control circuit to collect the corresponding fingerprint image signal.

It should be noted that, for a display module applied to an electronic product such as a mobile phone or a tablet computer, the display area of the display module is usually much larger than one finger, and the area illuminated by each point backlight is limited (for example, one) A point-shaped backlight for small LED lights with limited illumination area). Therefore, when divided into a plurality of regions, a point-shaped backlight can be used correspondingly to an optical fingerprint sensing area having a small area (for example, when an optical fingerprint sensing area having a small area is pressed by a finger, the corresponding corresponding is turned on. LED light), which effectively enhances the light intensity of the light source when the fingerprint image is acquired. Moreover, as described above, the imaging principle of the present invention fully utilizes the light omnidirectionality of the point backlight to avoid interference between different light sources. When the LED light is used as the dot backlight, the LED light is not ideal. Point-like backlight. Because LED lights have a certain luminous area (especially white, etc. The light powder converts the illuminating LED light source), and the larger the illuminating surface, the greater the proportion of the interference of the light emitted by the different illuminating points. Therefore, the possibility of interference can be reduced by pulling away the distance of the LED lamp to the optical fingerprint sensing area.

At the same time, the LEDs that make large light-emitting surfaces are expensive to manufacture, have high power consumption, and are large in size. Therefore, this embodiment can select a smaller LED lamp as a point backlight. The smaller the LED light, the more limited the area of illumination. The light intensity of the point backlight is attenuated by the quadratic distance, so the distance is far to a certain extent, the light intensity is not enough, and it cannot be a good fingerprint image. To this end, a plurality of LED lights are arranged, distributed in different areas, and the areas illuminated between each of the LED lights may partially overlap each other. Moreover, at the same time, only one LED light can be turned on to avoid light interference of different LED lights. In addition, the structure of the plurality of dot-shaped backlights in multiple regions can enable the corresponding fingerprint acquisition circuit to be activated in the sub-area, and at the same time, the fingerprint images of the plurality of regions can be collected at the same time, and the collection can be reduced. The role of time (because multiple small areas are performed simultaneously, equivalent to the acquisition time of a small area, while the acquisition time of a small area is less than the acquisition time of a large area), and can also reduce power consumption.

For more structures and properties of the display module provided in this embodiment, reference may be made to the corresponding content of the foregoing embodiment.

The embodiment of the present invention further provides a method for using a display module, and the display module may be any of the foregoing mentioned in the foregoing description. Therefore, the display module includes a self-luminous display panel, and the self-luminous display panel may include a first substrate, a second substrate, and a self-luminous circuit layer. The self-luminous circuit layer is located between the first substrate and the second substrate. The self-illuminating circuit layer includes a display area including a plurality of self-illuminating display pixels. The display area includes more than one optical fingerprint sensing area. In the optical fingerprint sensing area, each of the k self-luminous display pixels has at least one optical fingerprint sensing element, and m and n are 1 or more per m×n of the self-luminous display pixels. Any integer, k is any integer from 1 to m×n. In the optical fingerprint sensing area, the self-luminous display pixel includes a light transmissive area and a non-transparent area, and the optical fingerprint sensing element is located in the non-transparent area. The display module further includes a dot backlight, The number of the dot backlights is greater than or equal to the number of the optical fingerprint sensing regions, and one of the optical fingerprint sensing regions uses at least one of the dot backlights for fingerprint image acquisition; the dot backlight The source is located obliquely below the optical fingerprint sensing area.

The display module may further include a protective layer located above the first substrate of the self-luminous display panel.

The second substrate lower surface of the self-luminous display panel may further include a light anti-reflection layer, the light-light anti-reflection layer is located below the optical fingerprint sensing area, and the light anti-reflection layer can increase the point The proportion of light from the backlight entering the optical fingerprint sensing area. In the optical fingerprint sensing area of the self-luminous display panel, a distance between adjacent optical fingerprint sensing elements may be 30 μm to 100 μm. The self-luminous display pixel has a TFT device, a gate of the TFT device is located above the semiconductor layer, and a light shielding layer is disposed under the semiconductor layer; or, the self-luminous display pixel has a TFT device, and the TFT device The gate is located below the semiconductor layer with a light shielding layer over the semiconductor layer. The light shielding layer is electrically connected to a fixed potential. The area of the light shielding layer is larger than the area of the semiconductor layer.

The method includes: when detecting that at least one optical fingerprint sensing area is pressed by a finger, controlling an optical fingerprint sensing area pressed by a finger to perform a finger fingerprint image collecting operation, and controlling an optical fingerprint sensing area pressed by a finger The self-luminous display pixel stops emitting light. In this embodiment, the optical fingerprint sensing area pressed by the finger is defined as the first display area. Therefore, the foregoing process is: controlling the first display area to perform finger fingerprint image collecting work, and controlling the first display area. The self-illuminating display pixel stops emitting light.

In this embodiment, the method further includes: controlling an area of the display module that is not pressed by the finger to display information associated with the fingerprint identification. It should be noted that these areas that are not pressed by the finger also correspond to a part of the display area, although the finger is not directly pressed by the display area of the self-luminous layer, but is pressed against the display area via the corresponding first substrate surface. Or pressing on the display area via the first substrate and the protective layer.

In this embodiment, the area that is not pressed by the finger is defined as the second display area. Therefore, the second display area includes both the non-optical fingerprint sensing area and the optical fingerprint sensing. Area. In the above process, the usage method provided by the embodiment may further include: when the first display area performs a fingerprint image collection operation, controlling the second display area to display information associated with the fingerprint image collection work. For example, in the second display area, display "Please enter a fingerprint in the non-display area" or "Please enter a fingerprint in the following dark frame area". During the fingerprint entry process, the message "Enter correctly" or "Please re-enter" is displayed. When the correct fingerprint is collected, information such as “effective fingerprint” can be displayed, or a message such as “operational success” can be displayed according to the fingerprint operation. This method of use enables the display function and the fingerprint recognition function to work together to achieve a better user experience.

The usage method may further develop an application scenario of the fingerprint recognition function, for example, before the optical fingerprint sensing component of the optical fingerprint sensing area is not working, causing the first display area to display a corresponding display icon, indicating that the user will Put your finger inside the icon. After the user puts the finger into the area where the icon is displayed, the existing display panel itself or the external touch function can be used to sense that the user has placed the finger in the first display area, thereby controlling the corresponding optical fingerprint sensing area. The optical fingerprint sensing component enters a working state. At this time, the fingerprint image of the pressed fingerprint is collected by the optical fingerprint sensing component of the first display area, and the fingerprint image collecting function is completed, and can be further applied to the existing stored internal storage. The fingerprint image is identified and further utilized for encryption/unlocking and the like.

Specifically, when the display area of the entire display module is pressed by only one finger, it can be divided into the following four cases.

In the first case, the optical fingerprint sensing area pressed by one finger is one, and the point backlight corresponding to the optical fingerprint sensing area is only one, and the point backlight is controlled to collect the fingerprint image of the finger.

In the second case, the optical fingerprint sensing area pressed by one finger is one, and the point backlight corresponding to the optical fingerprint sensing area is two or more; controlling any one point-shaped backlight, and the fingerprint image of the finger The acquisition is performed, or two or more point backlights are controlled to be turned on in turn to take a fingerprint image of the finger from different directions in turn.

The second case above can be referred to FIG. 6. The display area 300 has an optical fingerprint sensing area 310, and the optical fingerprint sensing area 310 has three corresponding dot-shaped backlights. The dot backlight 321 , the dot backlight 322 and the dot backlight 323 are used to enable the three dot backlights to sequentially capture the fingerprint images of the finger 330 from different directions. Moreover, after the acquisition, the different images collected can be processed to perform distortion correction, improve the quality of the fingerprint image, and improve the accuracy of fingerprint recognition. Of course, when there are a plurality of dot backlights, when the fingerprint image is captured, the light emitted by any one of the dot backlights may be selected as the imaging light of the fingerprint image for the fingerprint image collection.

In the third case, the optical fingerprint sensing area pressed by one finger is two or more, and the point backlight corresponding to each optical fingerprint sensing area is one, and the point backlight of each optical fingerprint sensing area is controlled. The partial fingerprint image of the finger is collected, and the fingerprint images of the respective portions collected from the two or more optical fingerprint sensing regions are merged into the fingerprint image of the finger.

The third case above can be referred to FIG. 7. The display area 400 has four optical fingerprint sensing areas, which are an optical fingerprint sensing area 411, an optical fingerprint sensing area 412, an optical fingerprint sensing area 413, and an optical fingerprint sensing area 414, respectively. The four optical fingerprint sensing areas have corresponding four point backlights, which are a point backlight 421, a point backlight 422, a point backlight 423, and a point backlight 424, and a point backlight corresponds to An optical fingerprint sensing area. In use, the four point backlights may be simultaneously or separately opened, and the respective partial fingerprint images respectively collected by the corresponding four optical fingerprint sensing areas are merged into the fingerprint image of the finger 430.

In the fourth case, the optical fingerprint sensing area pressed by one finger is two or more, and the point backlights corresponding to each optical fingerprint sensing area are two or more, and the dot shape of each optical fingerprint sensing area is controlled. The backlight is turned on in turn to collect part of the fingerprint image of the finger from different directions in turn, and the fingerprint images collected from the two or more optical fingerprint sensing areas are merged into the fingerprint image of the finger.

When the display module is simultaneously pressed by two or more fingers, the processing condition of each finger may be any one of the above four cases. Moreover, two or more fingers can simultaneously acquire fingerprint images, and can also separately collect fingerprint images.

It should be noted that, in the above process, the self-luminous display panel may have a touch layer (for example, the touch layer is integrated on the lower surface of the first substrate of the self-luminous display panel), or the touch is disposed above the self-luminous display panel. Control layer. Then, the touch layer is used to detect the pressing position of the finger on the surface of the display area. For example, the touch layer is used to specifically determine which optical fingerprint sensing area the finger is pressed.

Although the present invention has been disclosed above, the present invention is not limited thereto. Any changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be determined by the scope defined by the appended claims.

Claims

A self-luminous display panel comprising:

a first substrate, a second substrate, and a self-luminous circuit layer, the self-luminous circuit layer being located between the first substrate and the second substrate;

The self-illuminating circuit layer includes a display area, and the display area includes a plurality of self-illuminating display pixels;

It is characterized by:

The display area includes more than one optical fingerprint sensing area;

In the optical fingerprint sensing area, each of the k self-luminous display pixels has at least one optical fingerprint sensing element, and m and n are 1 or more per m×n of the self-luminous display pixels. Any integer, k is any integer from 1 to m×n;

In the optical fingerprint sensing area, the self-luminous display pixel includes a light transmissive area and a non-transparent area, and the optical fingerprint sensing element is located in the non-transparent area.
The self-luminous display panel according to claim 1, wherein in the optical fingerprint sensing area, a distance between adjacent optical fingerprint sensing elements is 30 μm to 100 μm.
The self-luminous display panel according to claim 1, wherein the self-luminous display pixel has a TFT device, and a gate of the TFT device is located above the semiconductor layer, and a light shielding layer is disposed under the semiconductor layer.
A self-luminous display panel according to claim 1, wherein said self-luminous display panel The luminescent display pixel has a TFT device having a gate under the semiconductor layer and a light shielding layer above the semiconductor layer.
A self-luminous display panel according to claim 1, wherein said light shielding layer is connected to a fixed potential.
A display module comprising:

A self-luminous display panel according to any one of claims 1 to 5;

a dot backlight, the number of the dot backlights being greater than or equal to the number of the optical fingerprint sensing regions, and one optical fingerprint sensing region using at least one of the dot backlights for fingerprint image collection The point backlight is located obliquely below the optical fingerprint sensing area.
The display module as claimed in claim 6 , wherein the display module further comprises a protective layer, the protective layer being located above the first substrate of the self-luminous display panel.
The display module according to claim 6 or 7, wherein the second substrate lower surface of the self-luminous display panel further comprises a light anti-reflection layer, and the optical light-transmitting layer is located at the optical fingerprint. Below the sensing region, the light anti-reflecting layer is capable of increasing the proportion of light from the point-like backlight into the optical fingerprint sensing region.
A method of using a display module, characterized in that

The display module is as claimed in any one of claims 6 to 8;

The method of use includes:

When detecting that at least one of the optical fingerprint sensing areas is pressed by a finger, controlling an optical fingerprint sensing area pressed by a finger to perform a finger fingerprint image collecting operation, and controlling the optical fingerprint sensing area pressed by a finger The self-luminous display pixel stops emitting light.
The method according to claim 9, wherein the area of the display module that is not pressed by the finger is controlled to display information associated with the fingerprint recognition.
The method according to claim 9, wherein the optical fingerprint sensing area pressed by one finger is one, and the point backlight corresponding to the optical fingerprint sensing area is only one. The point backlight is controlled to collect the fingerprint image of the finger.
The method according to claim 9, wherein the optical fingerprint sensing area pressed by one finger is one, and the point backlight corresponding to the optical fingerprint sensing area is two or more. Controlling any one of the point-like backlights, collecting a fingerprint image of the finger, or controlling the two or more of the point-like backlights to be turned on in turn to collect the fingerprint image of the finger from different directions in turn .
The method according to claim 9, wherein the optical fingerprint sensing area pressed by one finger is two or more, and the point backlight corresponding to each of the optical fingerprint sensing areas is One, the point backlight that controls each of the optical fingerprint sensing areas collects a partial fingerprint image of the finger, and each part of the fingerprint image collected from the two or more optical fingerprint sensing areas is merged into Fingerprint of this finger image.
The method according to claim 9, wherein the optical fingerprint sensing area pressed by one finger is two or more, and the point backlight corresponding to each of the optical fingerprint sensing areas is Two or more, the point backlights controlling each of the optical fingerprint sensing areas are turned on in turn to take part of the fingerprint image of the finger from different directions in turn, from two or more of the optical fingerprint sensing areas The collected partial fingerprint images are merged into the fingerprint image of this finger.
The method of using any one of claims 9-14, wherein the display module is simultaneously pressed by two or more fingers.
The method of claim 9, wherein the self-luminous display panel has a touch layer, or a touch layer is disposed above the self-luminous display panel, and the touch layer is used to detect a finger in the The pressing position of the surface of the display area.