WO2018205124A1

WO2018205124A1 - Display module

Info

Publication number: WO2018205124A1
Application number: PCT/CN2017/083556
Authority: WO
Inventors: 凌严; 朱虹
Original assignee: 上海箩箕技术有限公司
Priority date: 2017-05-09
Filing date: 2017-05-09
Publication date: 2018-11-15

Abstract

Disclosed is a display module, comprising: a protective layer (110, 210, …, 1210); and a self-light-emitting display panel (120, 220, …, 1220) located below the protective layer (110, 210, …, 1210), wherein light can penetrate through the self-light-emitting display panel (120, 220, …, 1220) from top to bottom. The display module further comprises: an optical fingerprint sensor (130, 230, …, 1230) located below the self-light-emitting display panel (120, 220, …, 1220); and a point-shaped backlight source (140, 240, …, 1140) located below the protective layer (110, 210, …, 1210) and located beside the self-light-emitting display panel (120, 220, …, 1220), wherein light emitted by the point-shaped backlight source (140, 240, …, 1140) enters the protective layer (110, 210, …, 1210) at a diagonally upward angle. The display module has an integrated optical fingerprint recognition function.

Description

Display module

Technical field

The present invention relates to the field of optical fingerprint recognition, and in particular, to a display module.

Background technique

The fingerprint imaging recognition technology is a technique of acquiring a fingerprint image of a human body through a fingerprint sensor and then comparing it with existing fingerprint imaging information in the system to determine whether it is correct or not, thereby realizing the identity recognition technology. Due to its ease of use and the uniqueness of human fingerprints, fingerprint recognition technology has been widely used in various fields. For example, the public security bureau, customs and other security inspection areas, building access control systems, and consumer goods such as personal computers and mobile phones.

Fingerprint imaging recognition technology can be realized by various techniques such as optical imaging, capacitive imaging, and ultrasonic imaging. Relatively speaking, optical fingerprint imaging technology has relatively good imaging effect and relatively low equipment cost.

In the prior art, a fingerprint recognition function has been integrated in a display module, but it is usually a capacitive fingerprint recognition principle. For more information about the integrated fingerprint recognition function in the display module, refer to the Chinese invention patent application with the publication number CN106024833A.

The display module structure of the existing integrated fingerprint recognition function needs to be improved, and the performance needs to be improved.

Summary of the invention

The problem solved by the present invention is to provide a display module to better integrate the fingerprint recognition function in the display module, thereby obtaining a clear fingerprint image while displaying.

In order to solve the above problems, the present invention provides a display module including: a protective layer; a self-luminous display panel, the self-luminous display panel is located under the protective layer; light can pass through the self-luminous from top to bottom a display panel; the display module further includes: an optical fingerprint sensor, the optical fingerprint sensor is located below the self-luminous display panel; a backlight, the dot backlight is located under the protective layer and located on a side of the self-luminous display panel, and the light emitted by the dot backlight enters the protective layer at an obliquely upward angle.

Optionally, the self-luminous display panel comprises a first transparent substrate, a second transparent substrate, and a self-luminous circuit layer between the first transparent substrate and the second transparent substrate, wherein the self-luminous circuit layer comprises a plurality of Display pixel units; each of the display pixel units includes at least one non-transmissive region and at least one light transmissive region.

Optionally, a filter layer is disposed between the optical fingerprint sensor and the self-luminous display panel.

Optionally, a light transmissive glue is disposed between the point backlight and the protective layer, and the light transmissive glue covers a light emitting surface of the point backlight and a portion of the lower surface of the protective layer, wherein the point The light emitted by the backlight enters the light-transmitting glue from the light-emitting surface of the dot-shaped backlight, and then enters the protective layer from the light-transmitting glue.

Optionally, at least a portion of the lower surface of the light transmissive glue has a light absorbing layer.

Optionally, a thickening layer is disposed between the self-luminous display panel and the protective layer, and a lower surface of the protective layer has a light shielding layer, and the light shielding layer is adjacent to the transparent glue.

Optionally, the light-emitting surface of the dot-shaped backlight has a condensing lens in front of the light-collecting lens, and the condensing lens can reduce a divergence angle of the light of the point-shaped backlight into the protective layer, the dot-shaped backlight The light enters the collecting lens first and then enters the protective layer.

Optionally, the area of the lower surface of the protective layer opposite to the point backlight further includes an anti-reflection film capable of increasing the proportion of the light of the point backlight into the protective layer.

Optionally, a light guiding prism is disposed in front of the light emitting surface of the dot backlight, and light emitted by the point backlight enters the light guiding prism from a light emitting surface of the dot backlight, and then A light prism enters the protective layer.

Optionally, the light incident surface of the light guiding prism is a curved surface facing the point backlight. The upper surface of the light guiding prism is a plane parallel to the lower surface of the protective layer, and the lower surface of the light guiding prism is a slope connecting the upper surface and the light incident surface.

Optionally, a thickening layer is disposed between the self-luminous display panel and the protective layer, and a light incident surface of the light guiding prism is a slope facing the point backlight, and an upper surface of the light guiding prism is a plane parallel to the lower surface of the protective layer, a side surface of the light guiding prism is a plane parallel to a side surface of the thickening layer, and an upper surface of the light guiding prism is pasted with a lower surface of the protective layer. The vertical side of the light guiding prism is attached to the side of the thickened layer.

Optionally, a thickening layer is disposed between the self-luminous display panel and the protective layer, and a light incident surface of the light guiding prism is a curved surface facing the point backlight, and the upper surface of the light guiding prism a plane parallel to the lower surface of the protective layer, a side surface of the light guiding prism is a plane parallel to a side surface of the thickening layer, and an upper surface of the light guiding prism is pasted with a lower surface of the protective layer, The side surface of the light guiding prism is adhered to the side surface of the thickening layer.

Optionally, the lower surface of the light guiding prism has a light absorbing layer.

Optionally, the lower surface of the protective layer has a light shielding layer, and the light shielding layer is adjacent to the light guiding prism.

Optionally, a thickening layer is disposed between the self-luminous display panel and the protective layer.

Optionally, a region of the lower surface of the protective layer opposite to the point backlight is covered by a light shielding layer, and light emitted by the dot backlight enters the thickening layer from a side of the thickening layer, and then The protective layer is introduced from the thickened layer.

Optionally, the lower surface of the protective layer has a light shielding layer, and a side surface of the thickened layer opposite to the dot backlight is a slope facing the point backlight, and the top of the slope is adjacent to the light shielding layer. Light from the point-like backlight enters the thickened layer from the slope of the thickened layer and enters the protective layer from the thickened layer.

Optionally, the dot backlight is an LED lamp; or the dot backlight is two or more LED lamps.

Optionally, the dot backlight is two or more LED lights, and the two or more LEDs The lamps are evenly distributed on the same side of the optical fingerprint sensor.

Optionally, the optical fingerprint sensor includes two or more partial optical sensing regions, and one of the LED lights corresponds to one of the local optical sensing regions. The display module further includes a touch structure, and the touch structure includes Two or more partial touch regions, one of the partial optical sensing regions corresponding to one of the partial touch regions.

Optionally, the optical fingerprint sensor includes three or more local optical sensing regions, and the number of the LED lamps is less than the number of the local optical sensing regions; the display module further includes a touch structure, and the touch The structure includes three or more partial touch regions, and one of the partial optical sensing regions corresponds to one of the partial touch regions.

Optionally, each of the LED lamps corresponds to a plurality of adjacent partial optical sensing regions; and the partial optical sensing regions corresponding to the two adjacent LED lamps are identical.

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

In the technical solution of the present invention, a protective layer, a self-luminous display panel, and an optical fingerprint sensor are disposed from top to bottom. Wherein, the light can pass through the self-luminous display panel from top to bottom, and the display module further has a point backlight located below the protective layer and located on a side of the self-luminous display panel, the point backlight The emitted light enters the protective layer again at an oblique upward angle. In this structure, the light emitted by the dot backlight does not need to pass through the self-luminous display panel and the optical fingerprint sensor, and enters the protective layer. At the contact interface between the protective layer and the finger, the light undergoes corresponding optical phenomena such as reflection and refraction. And returning the corresponding reflective light to the self-luminous display panel below the protective layer. The reflected light passes through the self-luminous display panel and reaches the optical fingerprint sensor, and is received by the optical fingerprint sensor, so that the optical fingerprint sensor obtains the corresponding fingerprint image, and the whole The process uses the display module to realize the collection of the finger fingerprint image, and the captured fingerprint image is clear, and finally the display module integrates a good fingerprint recognition function.

At the same time, the display module of this structure can stop the display work or display the specific picture by controlling the display area corresponding to the optical fingerprint sensor in the fingerprint image when in use. The other areas can display the information associated with the fingerprint image collection work, so that the display function and the fingerprint recognition function can be combined to achieve a better user experience.

DRAWINGS

1 is a schematic cross-sectional view of a display module according to an embodiment of the present invention;

2 is a schematic cross-sectional view of a display module according to another embodiment of the present invention;

3 is a schematic cross-sectional view of a display module according to another embodiment of the present invention;

4 is a schematic cross-sectional view of a display module according to another embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a display module according to another embodiment of the present invention; FIG.

6 is a schematic cross-sectional view of a display module according to another embodiment of the present invention;

7 is a schematic cross-sectional view of a display module according to another embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view of a display module according to another embodiment of the present invention; FIG.

9 is a schematic cross-sectional view of a display module according to another embodiment of the present invention;

10 is a schematic cross-sectional view of a display module according to another embodiment of the present invention;

11 is a schematic bottom view of a display module according to another embodiment of the present invention;

FIG. 12 is a schematic bottom view of a display module according to another embodiment of the present invention.

detailed description

As described in the background art, the prior art mostly uses capacitive fingerprint imaging technology to integrate with a display module of a self-luminous display panel.

To this end, the present invention provides a display module in which an optical fingerprint sensor and a self-luminous display panel are integrated, so that a fingerprint recognition function can be realized while realizing display, and a display module is enabled by a corresponding structural design. Group can collect clear fingers The image image realizes the display function and the fingerprint recognition function to cooperate with each other, so that the user has a better use experience for the display module.

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

In this specification, except for the parts of FIG. 11 and FIG. 12, the upper and lower relationships in other contents are defined by placing the display module under the eyes of the user and positioning the protective layer at the top. That is to say, if one structure is located above the other structure, it means that when the display module is placed under the eyes of the user and the protective layer is at the top, the structure is closer to the user's eyes than the other structure. .

The embodiment of the invention provides a display module. Please refer to FIG. 1 .

The display module includes a protective layer 110, a self-luminous display panel 120, an optical fingerprint sensor 130, and a dot backlight 140. The self-luminous display panel 120 is located below the protective layer 110. Light can pass through the self-luminous display panel 120 from top to bottom. The dot backlight 140 is located under the protective layer 110, and the dot backlight 140 is located on the side of the self-luminous display panel 120. The light emitted by the dot backlight 140 enters the protective layer 110 at an obliquely upward angle, as shown in FIG. The arrow in the middle is upwards. The oblique downward arrow in Figure 1 indicates the corresponding reflected light. For ease of display, the refraction of light between different optical media structures is neglected in each of the various embodiments, as described herein.

The self-luminous display panel 120 may be directly under the protective layer 110 and may be directly laminated on the lower surface of the protective layer 110, that is, the two are in direct contact. In other cases, the self-luminous display panel 120 may also be adhered to the lower surface of the protective layer 110 by optical glue. The optical adhesive can be used to avoid the presence of air between the protective layer 110 and the self-luminous display panel 120, thereby further improving the optical performance of the module.

As mentioned above, the light can pass through the self-luminous display panel 120 from top to bottom, wherein the "from top to bottom" can be vertically downward, obliquely downward or meandering downward. In summary, light can pass downwardly from the self-luminous display panel 120 through the self-illuminating display panel 120 and continue to propagate downward. At the same time, the self-luminous display panel 120 is in other directions (eg In the front-rear direction and the left-right direction, light transmission is not required, and opacity in these directions is better.

In order to enable light to pass through the self-luminous display panel 120 from top to bottom, a specific structure of the self-luminous display panel 120 can be as shown in FIG. The self-luminous display panel 120 includes a first transparent substrate 121 , a second transparent substrate 122 , and a self-luminous circuit layer 123 between the first transparent substrate 121 and the second transparent substrate 122 . The optical fingerprint sensor 130 is located below the second transparent substrate 122.

The self-luminous display panel 120 also includes a sealing structure (not labeled). The sealing structure is also located between the first transparent substrate 121 and the second transparent substrate 122. The sealing structure, together with the first transparent substrate 121 and the second transparent substrate 122, seals the self-luminous circuit layer 123 between the first transparent substrate 121 and the second transparent substrate 122.

The material of the first transparent substrate 121 and the second transparent substrate 122 may be a light transmissive material, and the specific material may be inorganic glass or organic glass, or may be other plastic products other than organic glass.

The self-luminous circuit layer 123 in the self-luminous display panel 120 includes a plurality of display pixel units 1231. The area in which the pixel unit 1231 is located and the adjacent relationship of the respective display pixel units 1231 are indicated by a broken line in FIG. It should be noted that although the dotted line frame includes a portion of the first transparent substrate 121 and the second transparent substrate 122, this is only for the convenience of display, and the display pixel unit 1231 does not include the first transparent substrate 121 and the second transparent substrate 122. . Other embodiments use the same dashed box display mode, which is described together.

The self-luminous display panel 120 may be an OLED display panel, and the display pixel unit 1231 of the self-luminous circuit layer 123 may include an anode layer, a hole injection layer (HIL), an emission layer (EML), an electron injection layer (EIL), and a cathode. The layer structure or the like may further have a hole transport layer (HTL) and an electron transport layer (ETL), and may further include a structure for driving the TFT of the OLED, a driving metal line, and a storage capacitor. 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).

Each display pixel unit 1231 includes at least one non-transmissive region and at least one light transmissive region. The above-mentioned light-emitting layer or the like may be located in the corresponding non-light transmitting region. In the periphery of the non-transparent area, the display pixel unit 1231 has a corresponding light transmissive area.

It should be noted that, in other embodiments, the light transmissive area of one display pixel unit may be connected to the light transmissive area of another display pixel unit to form a wider transparent area. The display pixel units are generally adjacent, and the area between the two display pixel units adjacent to each other is also a light transmissive area, thereby enabling the three light transmissive areas to be connected as one large light transmissive area.

In this embodiment, the height of the light-transmitting region is set to be equal to the height of the self-light-emitting circuit layer 123, as shown in FIG. 1, so as to ensure that light can pass through the self-light-emitting circuit layer 123 from the light-transmitting region (it is noted that the self-light-emitting circuit layer 123) The height of each position may be slightly different, but the height of the self-illuminating circuit layer 123 at least a portion of the position is equal to the height of the light transmitting region). The light can pass through the self-illuminating circuit layer 123 from the light-transmitting area to ensure that the light can pass through the self-luminous display panel 120 from bottom to bottom, thereby ensuring that the display module can perform fingerprint image collection. It can be seen from the above that when the light passes obliquely downward through the self-luminous display panel 120, the light generally passes through the first transparent substrate 121, the light transmitting region and the second transparent substrate 122.

The structure in which the light-emitting layer of the pixel unit 1231 and the TFT, the driving metal line, and the storage capacitor for driving the OLED are required to have a metal layer, and thus, a corresponding non-light-transmitting region is formed. The gap between them can be set as a light-transmitting area, that is, on the basis of ensuring the corresponding structure and function, other structures of the display pixel unit 1231 can be made by using a light-transmitting structure as much as possible, so that more light can pass through. An OLED display panel (this pass generally refers to passing through the height of display pixel unit 1231, which is also commonly referred to as thickness).

In the non-transparent area of the display pixel unit 1231, not the entire area is non-transparent from top to bottom. Rather, the bottoms of these regions have a non-transmissive structure (illustrated in Fig. 1 as obliquely shaded portions in each display pixel unit 1231). That is, the structure above the structure such as the non-transmissive layer light-emitting layer is still transparent. For example, the structure above the light-emitting layer is transparent, so that the light emitted by the light-emitting layer can reach the user's eyes upward, thereby ensuring display of the OLED display panel. .

The optical fingerprint sensor 130 may include a fingerprint sensing circuit layer (not shown) and a substrate substrate (not shown). In one case, the fingerprint sensing circuit layer is located between the second transparent substrate 122 and the substrate. At this time, the optical fingerprint sensor 130 may be a TFT based on a glass or a plastic substrate (Thin Film Transistor). , the thin film transistor) process image sensor, that is, the substrate substrate may be glass or plastic, the optical fingerprint sensor 130 may also be an optical sensor based on a silicon substrate and fabricated by a CMOS process, that is, the substrate substrate is a silicon substrate; In another case, the base substrate is located between the second transparent substrate 122 and the fingerprint sensing electrical layer. At this time, the base substrate is a light transmissive material, such as a glass or plastic substrate. The optical fingerprint sensor 130 can be a back-illuminated image sensor based on a glass or plastic substrate, TFT process.

The fingerprint sensing circuit layer of the optical fingerprint sensor 130 includes a plurality of photosensitive pixel units (the photosensitive pixel unit has been mentioned before, not shown). Each of the photosensitive pixel units includes a photodiode or other photosensitive device, and the corresponding fingerprint reflected light can be received by the photosensitive element.

The dot backlight 140 can be an LED light. The light of the LED lamp may be near ultraviolet light, purple light, blue light, green light, yellow light, red light, near infrared light or white light. The dot backlight 140 may also be two or more LED lamps, and the LED lamps are evenly distributed on different sides of the self-luminous display panel 120.

The self-luminous display panel 120 and the optical fingerprint sensor 130 may be directly stacked. The “direct stacking” means that the optical fingerprint sensor 130 and the self-luminous display panel 120 are at least partially in contact, and the optical fingerprint sensor 130 and the self-luminous display panel 120 are generally flat on the upper and lower sides. In the flat structure, the two can be exactly the stacked form as shown in FIG.

The optical adhesive may also be attached between the self-luminous display panel 120 and the optical fingerprint sensor 130. The optical glue prevents air from being present between the self-luminous display panel 120 and the optical fingerprint sensor 130, thereby further improving the optical performance of the module.

It should be noted that, in other embodiments, a filter layer may be disposed between the optical fingerprint sensor and the self-luminous display panel, and the filter layer can at least partially transmit light emitted by a point backlight (eg, an LED lamp) while The filter layer filter layer can absorb or reverse Shooting light of other wavelengths to prevent other light (such as ambient light or display light from a self-illuminating display panel) from adversely affecting fingerprint recognition.

The protective layer 110 may be a flat substrate or other shape having a flat portion. The material of the protective layer 110 may be a transparent material, and the specific material may be inorganic glass or organic glass, or may be other plastic products other than organic glass.

As shown in FIG. 1 , the dot backlight 140 and the side of the self-luminous display panel 120 may have a space (not labeled). By adjusting the size of the interval, the light of the dot backlight 140 can be adjusted to the lower surface of the protective layer 110. Angle of incidence. However, in other embodiments, the dot backlight 140 may be disposed in direct contact with the side of the self-luminous display panel 120 without spacing.

As shown in FIG. 1 , there may be a space (not labeled) between the dot backlight 140 and the lower surface of the protective layer 120. By adjusting the size of the interval, the light of the dot backlight 140 can also be adjusted to the lower surface of the protective layer 110. Incidence angle. In other embodiments, the point backlight 140 and the lower surface of the protective layer 110 may also be placed in direct contact.

In this embodiment, the light emitted by the dot backlight 140 enters the protective layer 110 obliquely. After reaching the upper surface of the protective layer 110, the light is reflected and refracted at the interface formed by the finger fingerprint and the upper surface of the protective layer 110. a phenomenon that generates a corresponding reflected light; the reflected light returns obliquely downward to the protective layer 110, and passes through the protective layer 110 to reach the self-luminous display panel 120, and the light can pass through the self-luminous display panel 120 from top to bottom, thereby reflecting light Finally, the optical fingerprint sensor 130 can be reached and received by the photosensitive pixel unit (the photosensitive pixel unit refers to the subsequent content) in the optical fingerprint sensor 130, thereby enabling fingerprint image acquisition and implementing the fingerprint recognition function.

In this embodiment, the dot backlight 140 is disposed under the protective layer 110 and disposed on the side of the self-luminous display panel 120, and the optical fingerprint sensor 130 is disposed under the self-luminous display panel 120. Therefore, the dot backlight 140 is also Located on the outside (side) of the optical fingerprint sensor 130. Under the premise that the point backlight 140 is located on the side of the self-luminous display panel 120 and the optical fingerprint sensor 130, the light emitted by the point backlight 140 is further set to enter the protective layer 110 at an obliquely upward angle. At this time, the dot backlight Source 140 The light does not need to pass through the self-luminous display panel 120 and the optical fingerprint sensor 130 to enter the protective layer 110, thereby being used for the collection of the finger fingerprint image, that is, the collection of the finger fingerprint image, the utilization of the corresponding light is improved, and the final optical fingerprint is improved. The sensor 130 can receive the signal amount, and the collected fingerprint image is clear. Therefore, the display module integrates a good fingerprint recognition function.

In this embodiment, no structure is added between the dot backlight 140 and the protective layer 110. At this time, the entire display module has a simple structure and a simple manufacturing process.

Compared with the existing surface light source using the light guide plate, the dot backlight 140 can make the light light shift in the same direction, and the light offset from the point backlight 140 is similar, and the light angle difference is small, avoiding The mutual interference and mutual influence between the light rays, therefore, the light entering the protective layer 110 of the dot-shaped backlight 140 finally enters the optical fingerprint sensor 130 substantially at a similar angle, so that the acquired fingerprint image is less distorted and the fingerprint image is more Clear (that is, a clear fingerprint image can be obtained), improve the quality of the fingerprint image collected by the display module, and improve the fingerprint recognition performance of the module.

In the display module provided by the embodiment of the present invention, the fingerprint image can be collected in the display area of the display module by using the corresponding use method, thereby reducing the appearance size of the electronic product to which the display panel is applied, and improving the electronic product. The proportion of screens increases the aesthetic appearance of electronic products (for example, it can increase the screen ratio of mobile phone products and improve the appearance of mobile phone products). For example, a display area of the self-luminous display panel opposite to the optical fingerprint sensor is defined as a first display area, and a display area of other parts is defined as a second display area; when the optical fingerprint sensor performs fingerprint image collection work The first display area is controlled to stop displaying work or displaying a specific picture. When the optical fingerprint sensor performs a fingerprint image collection operation, the second display area is controlled to display information associated with the fingerprint image collection work. 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 sensor is not working, the first display area is displayed with a corresponding display icon, and the user is instructed to put a finger into the icon. When the user puts a finger into the display After the area of the icon, 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 optical fingerprint sensor to enter the working state. At this time, pressing the fingerprint The fingerprint image is collected by the optical fingerprint sensor below the first display area to complete the fingerprint image collection function, and can be further used for identifying the existing fingerprint image stored internally, and further utilizing functions such as encryption/unlocking.

Another embodiment of the present invention provides another display module. Please refer to FIG. 2 .

The display module includes a protective layer 210, a self-luminous display panel 220, an optical fingerprint sensor 230, and a dot backlight 240. The self-luminous display panel 220 is located below the protective layer 210. Light can pass through the self-luminous display panel 220 from top to bottom. The dot backlight 240 is located under the protective layer 210, and the dot backlight 240 is located on the side of the self-luminous display panel 220. The light emitted by the dot backlight 240 enters the protective layer 210 at an obliquely upward angle. The arrow in the middle is upwards. The oblique downward arrow in Figure 2 indicates the corresponding reflected light.

The self-luminous display panel 220 includes a first transparent substrate 221 , a second transparent substrate 222 , and a self-luminous circuit layer 223 between the first transparent substrate 221 and the second transparent substrate 222 . The optical fingerprint sensor 230 is located below the second transparent substrate 222. The self-luminous circuit layer 223 in the self-luminous display panel 220 includes a plurality of display pixel units 2231. Each display pixel unit 2231 includes at least one non-transmissive region and at least one light transmissive region. This structure allows light to pass through the self-luminous display panel 220 from top to bottom. As shown in FIG. 2, the reflected light passes through the self-luminous display panel 220.

As shown in FIG. 2, a light-transmitting adhesive 250 is disposed between the dot-shaped backlight 240 and the protective layer 210. The light-transmitting adhesive 250 covers the light-emitting surface of the dot-shaped backlight 240 and a portion of the lower surface of the protective layer 210. The dot-shaped backlight The light emitted by the 240 enters the light transmitting paste 250 from the light emitting surface of the dot backlight, and then enters the protective layer 210 from the light transmitting adhesive 250.

When there is no light-transmitting glue, the light emitted by the point-like backlight usually needs to pass through the air environment and then enter the protective layer. At this time, the light will reflect and the like, causing the light entering the protective layer to be reduced, and the light enters the protective layer from the air. There will be more obvious refraction, refraction The irradiation area of the incident light is reduced (this can be compared with reference to FIG. 1 and FIG. 2, in which the illumination area of the light on the upper surface of the protective layer is obviously smaller than the illumination area of the light on the upper surface of the protective layer in FIG. 2). By adding the light-transmitting glue 250, the light does not need to pass through the air, and the amount of incident light is increased. At the same time, the refractive index of the transparent adhesive 250 and the refractive index of the protective layer 210 are generally close, so that the incident light can be increased on the upper surface of the protective layer. The area of illumination (increasing the longitudinal depth), thereby increasing the area of fingerprint imaging.

As shown in FIG. 2, the lower surface of the transparent adhesive 250 has a light absorbing layer 260. The light-transmitting adhesive 250 usually has a portion directly covering the dot-shaped backlight 240 (the covered surface generally includes the light-emitting surface of the dot-shaped backlight 240), and the surface of the light-transmitting adhesive 250 under the point-like backlight 240 covered by the light-transmitting adhesive 250 belongs to The lower surface of the light transmissive glue 250. The dot backlight 240 is usually an LED lamp, and the angle of the exiting light of the LED lamp is large, and a part of the light is obliquely irradiated downward to the lower surface of the transparent adhesive 250. This portion of the light will reflect and scatter on the lower surface of the light transmissive glue 250, regenerating the secondary light entering the protective layer 210 obliquely upward. However, these secondary rays are already stray light. If there is an intersection with the light that directly enters the protective layer 210 obliquely upward, the fingerprint image will be misaligned, which will cause the fingerprint image to be disturbed and blurred. Therefore, by adding the light absorbing layer 260 to the lower surface of the light-transmitting paste 250, the stray light is eliminated, thereby further improving the quality of the fingerprint image. In other embodiments, the light absorbing layer on the lower surface of the light transmissive gel may be omitted if the fingerprint image has been met.

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

Another embodiment of the present invention provides another display module. Please refer to FIG. 3.

The display module includes a protective layer 310, a self-luminous display panel 320, an optical fingerprint sensor 330, and a dot backlight 340. The self-luminous display panel 320 is located below the protective layer 310. Light can pass through the self-luminous display panel 320 from top to bottom. The dot backlight 340 is located under the protective layer 310, and the dot backlight 340 is located on the side of the self-luminous display panel 320. The light emitted by the dot backlight 340 enters the protective layer 310 at an obliquely upward angle, as shown in FIG. The arrow in the middle is upwards. The oblique downward arrow in Figure 3 indicates the corresponding The reflected light.

The self-luminous display panel 320 includes a first transparent substrate 321 , a second transparent substrate 322 , and a self-luminous circuit layer 323 between the first transparent substrate 321 and the second transparent substrate 322 . The optical fingerprint sensor 330 is located below the second transparent substrate 322. The self-luminous circuit layer 323 in the self-luminous display panel 320 includes a plurality of display pixel units 3231. Each display pixel unit 3231 includes at least one non-transmissive region and at least one light transmissive region. This structure allows light to pass through the self-luminous display panel 320 from top to bottom. As shown in FIG. 3, the reflected light passes through the self-luminous display panel 320.

As shown in FIG. 3, the light-emitting surface of the point backlight 340 has a collecting lens 350. The collecting lens 350 can reduce the divergence angle of the light of the point backlight 340 into the protective layer 310, and the light of the point backlight 340. The condensing lens 350 is first entered and then enters the protective layer 310. At this time, the condensing lens 350 achieves the function of improving the light utilization efficiency, and achieves the effect of improving the image signal intensity. If the concentrating lens 350 is used, and the point backlight 340 with lower power can be used correspondingly, the concentrating lens 350 can reduce the power consumption of the module.

As shown in FIG. 3, a region of the lower surface of the protective layer 310 opposite to the dot backlight 340 (this portion, that is, a region where the lower surface of the protective layer 310 is used to receive incident light) further includes an anti-reflection film 360 and an anti-reflection film 360. It is possible to increase the proportion of the light of the point backlight entering the protective layer 310. Increasing the proportion of light entering the protective layer 310 can further improve the quality of the fingerprint image and further improve the fingerprint image recognition capability of the display module.

Another embodiment of the present invention provides another display module. Please refer to FIG. 4.

The display module includes a protective layer 410, a self-luminous display panel 420, an optical fingerprint sensor 430, and a point backlight 440. The self-luminous display panel 420 is located below the protective layer 410. Light can pass through the self-luminous display panel 420 from top to bottom. The dot backlight 440 is located below the protective layer 410, and the dot backlight 440 is located on the side of the self-luminous display panel 420. At the same time, the light from the point backlight 440 enters the protective layer 410 at an obliquely upward angle, as indicated by the oblique upward arrows in FIG. The oblique downward arrow in Figure 4 indicates the corresponding reflected light.

The self-luminous display panel 420 includes a first transparent substrate 421 , a second transparent substrate 422 , and a self-luminous circuit layer 423 between the first transparent substrate 421 and the second transparent substrate 422 . The optical fingerprint sensor 430 is located below the second transparent substrate 422. The self-luminous circuit layer 423 in the self-luminous display panel 420 includes a plurality of display pixel units 4231. Each display pixel unit 4231 includes at least one non-transmissive region and at least one light transmissive region. This structure allows light to pass through the self-luminous display panel 220 from top to bottom. As shown in FIG. 4, the reflected light passes through the self-luminous display panel 420.

As shown in FIG. 4, the light-emitting surface of the dot-shaped backlight 440 has a light-guiding prism 450. The light emitted by the dot-shaped backlight enters the light-guiding prism 450 from the light-emitting surface of the dot-shaped backlight 440, and then enters the light-guiding prism 450. Protective layer 410.

The light guiding prism 450 is a right-angled triangle in the cross section shown in FIG. 4 (the three-dimensional shape of which is a triangular prism shape having an end surface not shown in FIG. 4). One of the triangles corresponds to the vertical side of the light guiding prism 450, and the vertical side serves as the light incident surface of the light guiding prism 450, and the light enters the light guiding prism 450 from the light incident surface. The hypotenuse of the triangle corresponds to the lower surface of the light guiding prism 450, which is an oblique lower surface in this embodiment.

In other embodiments, the light guiding prism may also have other shapes.

An optical glue (not shown) may be attached between the light guiding prism 450 and the protective layer 410.

The function of the light guiding prism 450 is similar to that of the light transmitting glue 250 shown in FIG. 2, that is, reducing the refraction of the light emitted by the point backlight 440, so that the upper surface area of the protective layer which the point backlight 440 can illuminate is larger, that is, The area where the finger fingerprint image is obtained is larger.

As shown in FIG. 4, the lower surface of the light guiding prism 450 has a light absorbing layer 460. The function of the light absorbing layer 460 is the same as that of the light absorbing layer 260 of FIG. 2, that is, the corresponding stray light can be eliminated. In other embodiments, the light absorbing layer on the lower surface of the light guiding prism may be omitted if the fingerprint image has been met.

Another embodiment of the present invention provides another display module. Please refer to FIG. 5.

The display module includes a protective layer 510, a self-luminous display panel 520, an optical fingerprint sensor 530, and a point backlight 540. The self-luminous display panel 520 is located below the protective layer 510. Light can pass through the self-luminous display panel 520 from top to bottom. The dot backlight 540 is located under the protective layer 510, and the dot backlight 540 is located on the side of the self-luminous display panel 520. The light emitted by the dot backlight 540 enters the protective layer 510 at an obliquely upward angle, as shown in FIG. The arrow in the middle is upwards. The oblique downward arrow in Figure 5 indicates the corresponding reflected light.

The self-luminous display panel 520 includes a first transparent substrate 521 , a second transparent substrate 522 , and a self-luminous circuit layer 523 between the first transparent substrate 521 and the second transparent substrate 522 . The optical fingerprint sensor 530 is located below the second transparent substrate 522. The self-luminous circuit layer 523 in the self-luminous display panel 520 includes a plurality of display pixel units 5231. Each display pixel unit 5231 includes at least one non-transmissive region and at least one light transmissive region. This structure allows light to pass through the self-luminous display panel 520 from top to bottom. As shown in FIG. 5, the reflected light passes through the self-luminous display panel 520.

As shown in FIG. 5, the light-emitting surface of the dot-shaped backlight 540 has a light-guiding prism 550, and the light emitted by the dot-shaped backlight enters the light-guiding prism 550 from the light-emitting surface of the dot-shaped backlight 540, and then enters from the light-guiding prism 550. Protective layer 510.

The light guiding prism 550 reduces the refraction of the light emitted by the point backlight 540, so that the upper surface area of the protective layer that the dot backlight 540 can illuminate is larger.

As shown in FIG. 5, the light incident surface of the light guiding prism 550 is a curved surface facing the backlight 540. The curved surface may be a side surface or a spherical surface of the cylinder. For example, the cylindrical side surface in FIG. 5 is taken as an example. The upper surface of the light guiding prism 550 is a plane parallel to the lower surface of the protective layer 510, and the lower surface of the light guiding prism 550 is a slope connecting the upper surface and the light incident surface.

Since the light incident surface of the light guiding prism 550 is a curved surface facing the backlight 540, the phase Compared with the display module of FIG. 4, in the display module of FIG. 5, the arc surface can be used to converge more light, reduce the divergence angle of the light entering the protective layer 510, and further improve the light of the point backlight 540. Utilization rate.

As shown in FIG. 5, the lower surface of the light guiding prism 550 has a light absorbing layer 560. The function of the light absorbing layer 560 is also the same as that of the light absorbing layer 260 of FIG. 2, that is, the corresponding stray light can be eliminated. In other embodiments, the light absorbing layer on the lower surface of the light guiding prism may be omitted if the fingerprint image has been met.

Another embodiment of the present invention provides another display module. Please refer to FIG. 6.

The display module includes a protective layer 610, a self-luminous display panel 620, an optical fingerprint sensor 630, and a dot backlight 640. The self-luminous display panel 620 is located below the protective layer 610. Light can pass through the self-luminous display panel 620 from top to bottom. The point backlight 640 is located below the protective layer 610, and the point backlight 640 is located on the side of the self-luminous display panel 620. The light emitted by the point backlight 640 enters the protective layer 610 at an obliquely upward angle, as shown in FIG. The arrow in the middle is upwards. The oblique downward arrow in Figure 6 indicates the corresponding reflected light.

The self-luminous display panel 620 includes a first transparent substrate 621 , a second transparent substrate 622 , and a self-luminous circuit layer 623 between the first transparent substrate 621 and the second transparent substrate 622 . The optical fingerprint sensor 630 is located below the second transparent substrate 622. The self-luminous circuit layer 623 in the self-luminous display panel 620 includes a plurality of display pixel units 6231. Each display pixel unit 6231 includes at least one non-transmissive region and at least one light transmissive region. This structure allows light to pass through the self-luminous display panel 620 from top to bottom. As shown in FIG. 6, the reflected light passes through the self-luminous display panel 620.

As shown in FIG. 6 , a light-transmitting adhesive 650 is disposed between the dot backlight 640 and the protective layer 610 , and the light-transmitting adhesive 650 covers the light-emitting surface of the dot-shaped backlight 640 and a portion of the lower surface of the protective layer 610 . The light emitted by the source 640 enters the light from the light emitting surface of the point backlight. The glue 650 enters the protective layer 610 from the transparent adhesive 650.

As shown in FIG. 6, the lower surface of the transparent adhesive 650 has a light absorbing layer 680. The function of the light absorbing layer 680 is the same as that of the light absorbing layer 260 of FIG. 2, and reference may be made to the corresponding contents of the foregoing embodiments. In other embodiments, the light absorbing layer on the lower surface of the light transmissive gel may be omitted if the fingerprint image has been met.

As shown in FIG. 6, a thickening layer 660 is further disposed between the self-luminous display panel 620 and the protective layer 610. The thickening layer 660 is laminated between the self-luminous display panel 620 and the protective layer 610.

As shown in FIG. 6 , the lower surface of the protective layer 610 has a light shielding layer 670 , and the light shielding layer 670 is adjacent to the light transmissive adhesive 650 . The light transmissive adhesive 650 is adjacent to the light shielding layer 670 and the side and part of the thickening layer 660 . The sides of the light emitting display panel 620 are adjacent to each other.

By adding a thickening layer 660 between the self-luminous display panel 620 and the protective layer 610, the incident angle range of the light entering the protective layer 610 is increased (the side of the thickened layer 660 can also be incident on the light), thereby enabling the protective layer The width of the 610 receiving light region is increased, thereby improving the quality of the fingerprint image collected by the optical fingerprint sensor module.

By providing the light shielding layer 670, it is possible to prevent other light from entering the protective layer from the lower surface of the protective layer 610, which further contributes to improving the fingerprint recognition performance of the module.

In FIG. 6, the light emitted by the dot backlight 640 enters the protective layer 610 in two parts: a part passes through the transparent adhesive 650, and then enters the protective layer 610 from the lower surface of the protective layer 610; the other part passes through the transparent adhesive 650. Thereafter, the side of the thickening layer 660 is entered, and after passing through the thickening layer 660, the protective layer 610 is further removed from the lower surface of the protective layer 610.

Another embodiment of the present invention provides another display module. Please refer to FIG. 7.

The display module includes a protective layer 710, a self-luminous display panel 720, an optical fingerprint sensor 730, and a point backlight 740. The self-luminous display panel 720 is located below the protective layer 710. The dot backlight 740 is located below the protective layer 710, and the dot backlight 740 is located On the side of the self-luminous display panel 720, the light emitted by the dot backlight 740 enters the protective layer 710 at an obliquely upward angle, as indicated by the oblique upward arrow in FIG. The oblique downward arrow in Figure 7 indicates the corresponding reflected light.

The self-luminous display panel 720 includes a first transparent substrate 721 , a second transparent substrate 722 , and a self-luminous circuit layer 723 between the first transparent substrate 721 and the second transparent substrate 722 . The optical fingerprint sensor 730 is located below the second transparent substrate 722. The self-luminous circuit layer 723 in the self-luminous display panel 720 includes a plurality of display pixel units 7231. Each display pixel unit 7231 includes at least one non-transmissive region and at least one light transmissive region. This structure allows light to pass through the self-luminous display panel 720 from top to bottom. As shown in FIG. 7, the reflected light passes through the self-luminous display panel 720.

The light-emitting surface of the dot-shaped backlight 740 has a light-guiding prism 750. The light emitted from the dot-shaped backlight 740 enters the light-guiding prism 750 from the light-emitting surface of the dot-shaped backlight 740, and enters the protective layer 710 from the light-guiding prism 750.

A thickening layer 760 is disposed between the self-luminous display panel 720 and the protective layer 710. The light incident surface (not labeled) of the light guiding prism 750 is a slope facing the point backlight 740, and the upper surface of the light guiding prism 750 is opposite to the protective layer 710. The plane of the lower surface is parallel, the side surface of the light guiding prism 750 is a plane parallel to the side surface of the thickening layer 760, the upper surface of the light guiding prism 750 is adhered to the lower surface of the protective layer 710, and the vertical side of the light guiding prism 750 is increased. Paste the side of the thick layer 760. The upper surface of the light guiding prism 750 and the lower surface of the protective layer 710 may be pasted by optical glue. The vertical side of the light guiding prism 750 and the side of the thickening layer 760 may also be pasted by optical glue.

The lower surface of the protective layer 710 has a light shielding layer 770 adjacent to the light guiding prism 750. Through the light shielding layer 770, it can be ensured that the light entering the protective layer 710 of the point backlight 740 is first passed through the light guiding prism 750, and the light shielding layer 770 can also reduce other light entering the protective layer. The function of the light guiding prism 750 can be referred to the corresponding content of the foregoing embodiment.

As shown in FIG. 7, the beveled top of the light guiding prism 750 is adjacent to the light shielding layer 770, and the vertical side of the light guiding prism 750 is also adjacent to a portion of the side surface of the self-luminous display panel 720.

In FIG. 7, the light emitted by the dot backlight 740 enters the protective layer 710 in two parts: a part passes through the light guiding prism 750, and then enters the protective layer 710 from the lower surface of the protective layer 710; the other part passes through the light guiding prism 750. Thereafter, the side of the thickened layer 760 is entered, and after passing through the thickened layer 760, the protective layer 710 is further introduced from the lower surface of the protective layer 710.

Another embodiment of the present invention provides another display module. Please refer to FIG. 8.

The display module includes a protective layer 810, a self-luminous display panel 820, an optical fingerprint sensor 830, and a point backlight 840. The self-luminous display panel 820 is located below the protective layer 810. The dot backlight 840 is located under the protective layer 810, and the dot backlight 840 is located on the side of the self-luminous display panel 820. The light emitted by the dot backlight 840 enters the protective layer 810 at an obliquely upward angle, as shown in FIG. The arrow in the middle is upwards. The oblique downward arrow in Figure 8 indicates the corresponding reflected light.

The self-luminous display panel 820 includes a first transparent substrate 821, a second transparent substrate 822, and a self-luminous circuit layer 823 between the first transparent substrate 821 and the second transparent substrate 822. The optical fingerprint sensor 830 is located below the second transparent substrate 822. The self-luminous circuit layer 823 in the self-luminous display panel 820 includes a plurality of display pixel units 8231. Each display pixel unit 8231 includes at least one non-transmissive region and at least one light transmissive region. This structure allows light to pass through the self-luminous display panel 820 from top to bottom. As shown in FIG. 8, the reflected light passes through the self-luminous display panel 820.

The light-emitting surface 850 of the dot-shaped backlight 840 has a light-guiding prism 850. The light emitted from the dot-shaped backlight 840 enters the light-guiding prism 850 from the light-emitting surface of the dot-shaped backlight 840, and enters the protective layer 810 from the light-guiding prism 850.

A thickening layer 860 is disposed between the self-luminous display panel 820 and the protective layer 810. The light incident surface (not labeled) of the light guiding prism 850 is a curved surface facing the point backlight 840, and the upper surface of the light guiding prism 850 is a protective layer. The plane of the lower surface of the 810 is parallel, the side surface of the light guiding prism 850 is a plane parallel to the side surface of the thickening layer 860, and the upper surface of the light guiding prism 850 is protected. The lower surface of the layer 810 is pasted, and the vertical side of the light guiding prism 850 is pasted to the side of the thickening layer 860.

Since the light incident surface of the light guiding prism 850 is a curved surface, the light guiding prism 850 also has the function of collecting light, so that the light is more concentrated, and the incident light enters the divergence angle of the protective layer 810, which is more helpful for the identification of the finger fingerprint.

The upper surface of the light guiding prism 850 and the lower surface of the protective layer 810 may be pasted by optical glue. The vertical side of the light guiding prism 850 and the side of the thickening layer 860 may also be pasted by optical glue.

The lower surface of the protective layer 810 has a light shielding layer 870 adjacent to the light guiding prism 850. Through the light shielding layer 870, it can be ensured that the light entering the protective layer 810 of the point backlight 840 is first passed through the light guiding prism 850, and the light shielding layer 870 can also reduce other light from entering the protective layer 810. The function of the light guiding prism 850 can be referred to the corresponding content of the foregoing embodiment.

Another embodiment of the present invention provides another display module. Please refer to FIG. 9.

The display module includes a protective layer 910, a self-luminous display panel 920, an optical fingerprint sensor 930, and a dot backlight 940. The self-luminous display panel 920 is located below the protective layer 910. The dot backlight 940 is located under the protective layer 910, and the dot backlight 940 is located on the side of the self-luminous display panel 920. The light emitted by the dot backlight 940 enters the protective layer 910 at an obliquely upward angle, as shown in FIG. The arrow in the middle is upwards. The oblique downward arrow in Figure 9 indicates the corresponding reflected light.

The self-luminous display panel 920 includes a first transparent substrate 921 , a second transparent substrate 922 , and a self-luminous circuit layer 923 between the first transparent substrate 921 and the second transparent substrate 922 . The optical fingerprint sensor 930 is located below the second transparent substrate 922. The self-luminous circuit layer 923 in the self-luminous display panel 920 includes a plurality of display pixel units 9231. Each display pixel unit 9231 includes at least one non-transmissive region and at least one light transmissive region. This structure makes The light can pass through the self-luminous display panel 920 from top to bottom. As shown in FIG. 9, the reflected light passes through the self-luminous display panel 920.

A thickened layer 950 is disposed between the self-luminous display panel 920 and the protective layer 910. At the same time, the area of the lower surface of the protective layer 910 opposite to the point backlight 940 is covered by the light shielding layer 960, and the light emitted by the point backlight 940 enters the thickening layer 950 from the side of the thickening layer 950, and then enters the thickening layer 950. Protective layer 910.

The light-shielding layer 960 completely covers the area of the lower surface of the protective layer 910 opposite to the point backlight 940, and controls the light-emitting position and the light-emitting angle of the point backlight 940. The present embodiment allows the point-like backlight to enter the protective layer 910. The 940 light rays all enter from the side of the thickening layer 950. At this time, the light angles are more consistent and the propagation path is more uniform, which helps to improve the quality of the captured fingerprint image, which helps to improve the fingerprint recognition of the module. performance.

Another embodiment of the present invention provides another display module. Please refer to FIG.

The display module includes a protective layer 1010, a self-luminous display panel 1020, an optical fingerprint sensor 1030, and a point backlight 1040. The self-luminous display panel 1020 is located below the protective layer 1010. The dot backlight 1040 is located under the protective layer 1010, and the dot backlight 1040 is located on the side of the self-luminous display panel 1020. The light emitted by the dot backlight 1040 enters the protective layer 1010 at an obliquely upward angle, as shown in FIG. The arrow in the middle is upwards. The oblique downward arrow in Figure 10 indicates the corresponding reflected light.

The self-luminous display panel 1020 includes a first transparent substrate 1021, a second transparent substrate 1022, and a self-luminous circuit layer 1023 between the first transparent substrate 1021 and the second transparent substrate 1022. The optical fingerprint sensor 1030 is located below the second transparent substrate 1022. The self-luminous circuit layer 1023 in the self-luminous display panel 1020 includes a plurality of display pixel units 10231. Each display pixel unit 10231 includes at least one non-transmissive region and at least one light transmissive region. This structure allows light to pass through the self-luminous display panel 1020 from top to bottom. As shown in FIG. 10, the reflected light passes through the self-luminous display panel 1020.

The self-luminous circuit layer 1023 in the self-luminous display panel 1020 includes a plurality of display pixel units 10231. Each display pixel unit 10231 includes at least one non-transmissive region and at least one light transmissive region.

A thickened layer 1050 is provided between the self-luminous display panel 1020 and the protective layer 1010. Meanwhile, the lower surface of the protective layer 1010 has a light shielding layer 1060, and the side opposite to the dot backlight 1040 is a slope facing the dot backlight 1040, and the top of the slope is adjacent to the light shielding layer, as shown in FIG. . Under this configuration, by controlling the dot backlight 1040, the light emitted by the dot backlight 1040 can enter the thickening layer 1050 from the side of the thickening layer 1050 and then enter the protective layer 1010 from the thickening layer 1050.

The area of the lower surface of the protective layer 1010 opposite to the point backlight 1040 is completely covered by the light shielding layer 1060. Also, the control of the point backlight 1040 ensures that the light of the point backlight 1040 entering the protective layer 1010 is from the thickening layer 1050. The side entry also makes these light angles more consistent, and the propagation path is more uniform, which helps to improve the quality of the captured fingerprint image, which helps to improve the fingerprint recognition performance of the module.

With respect to the embodiment of FIG. 9, in the embodiment of FIG. 10, the side surface of the thickening layer 1050 is beveled. Therefore, when the side slope of the thickening layer 1050 is used as the light incident surface, the dot backlight 1040 of a larger angular range is Light can enter the protective layer 1010 through the side slope of the thickening layer 1050, so that the irradiation area of the incident light on the upper surface of the protective layer 1010 can be increased (increasing the fingerprint imaging width), thereby increasing the fingerprint imaging area.

Another embodiment of the present invention provides another display module. Please refer to FIG. 11 to FIG. 10, FIG. 11 is a bottom view, that is, FIG. 11 is a schematic view showing the structure under the protective layer, viewed from the lower surface of the protective layer to the upper surface direction, so that the corresponding point can be seen. Structure such as backlight, optical fingerprint sensor, self-luminous display panel and protective layer. Therefore, the cross-sectional structure of FIG. 11 can be referred to FIG. 1 to FIG. 10, and conversely, The bottom view structure of FIGS. 1 to 10 can be referred to FIG.

In the bottom view structure shown in FIG. 11 , the display module includes a protective layer 1110 , a self-luminous display panel 1120 , an optical fingerprint sensor 1130 , and a point backlight 1140 . The protective layer 1110 is located at the bottom, and the self-luminous display panel 1120 is above the protective layer 1110 . Above the self-luminous display panel 1120 is an optical fingerprint sensor 1130, and the dot backlight 1140 is also located above the protective layer 1110, and the dot backlight 1140 is located beside the self-luminous display panel 1120 and the optical fingerprint sensor 1130.

When the bottom view structure shown in FIG. 11 is cut and placed as shown in FIG. 1 to FIG. 10, the display module provided in this embodiment can also be seen: the self-luminous display panel 1120 is located under the protective layer 1110. The optical fingerprint sensor 1130 is located below the self-luminous display panel 1120; the light can pass through the self-luminous display panel 1120 from top to bottom; the dot backlight 1140 is located below the protective layer 1110, and the dot backlight 1140 is located on the self-luminous display panel 1120. On the side, the light emitted by the dot backlight 1140 enters the protective layer 1110 at an obliquely upward angle.

The self-luminous display panel 1120 may include a first transparent substrate (not shown), a second transparent substrate (not shown), and a self-luminous circuit layer between the first transparent substrate and the second transparent substrate (not shown) Out). The self-luminous circuit layer in the self-luminous display panel 1120 may include a plurality of display pixel units (not shown). Each display pixel unit may include at least one non-transmissive region and at least one light transmissive region.

As shown in FIG. 11, in the present embodiment, the dot backlight 1140 is four LED lamps (not labeled), and the four LED lamps are evenly distributed on the same side of the optical fingerprint sensor. The optical fingerprint sensor corresponds to four local optical sensing regions. In the plane shown in FIG. 11, the optical fingerprint sensor is divided into four partial optical sensing regions by three broken lines. One LED light corresponds to a local optical sensing area. Meanwhile, although not shown in FIG. 11, the display module further includes a touch structure, the touch structure includes four partial touch areas, and a local optical sensing area corresponds to a partial touch area (at the same time, a part The touch area also corresponds to a local optical sensing area). In the bottom view plane shown in FIG. 11, if the local touch area is displayed, the corresponding partial touch area and the local area are displayed. The optical sensing areas are completely coincident.

With the above structure, in the display module provided by the embodiment, an LED lamp can be used as a light source of a local optical sensing area, and at the same time, the corresponding partial touch area is used to determine which local touch area the finger is in contact with. Then, the corresponding local optical sensing area and the LED lamp are controlled to work, and the fingerprint image of the finger is collected. In this way, since only one of the LED lights and one of the local optical sensing areas are used at a time, it is not necessary to use all the LED lights at the same time, and the entire optical fingerprint sensor is not required to perform fingerprint collection, which not only improves the fingerprint. Image acquisition speed and reduced power consumption.

It should be noted that the touch structure may be a capacitive touch structure, and the capacitive touch structure may be located between the protective layer and the self-luminous display panel (for example, bonding or being fabricated on the lower surface of the protective layer, for example, bonding) Or on the upper surface of the self-luminous display panel, the capacitive touch structure may also be integrated inside the self-luminous display panel.

In other embodiments, the dot backlight may also be two, three or more LED lights that are evenly distributed on the same side of the optical fingerprint sensor. Correspondingly, the number of the local optical sensing area and the local touch area is equal to the number of LED lights, and the specific corresponding manner is also one-to-one correspondence. Please refer to the corresponding content above.

In other embodiments, each of the partial optical sensing regions may also correspond to a plurality of partial touch regions, thereby improving the accuracy of detecting the position of the finger pressing and improving the accuracy of positioning the finger pressing.

Another embodiment of the present invention provides another display module. Please refer to FIG. Different from FIG. 1 to FIG. 10, FIG. 12 is a bottom view, that is, FIG. 12 is a schematic view showing the structure under the protective layer, which is viewed from the lower surface of the protective layer to the upper surface direction, so that the corresponding point can be seen. Structure such as backlight, optical fingerprint sensor, self-luminous display panel and protective layer. Therefore, the cross-sectional structure of FIG. 12 can be referred to FIG. 1 to FIG. 10, and conversely, the bottom-view structure of FIGS. 1 to 10 can be referred to FIG.

In the bottom view structure shown in FIG. 12, the display module includes a protective layer 1210 and a self-luminous display. The panel 1220, the optical fingerprint sensor 1230, and the dot backlight (the dot backlight is not separately labeled, the dot backlight includes the following six LED lamps), the protective layer 1210 is located at the bottom, and the self-luminous display panel 1220 is above the protective layer 1210. Above the self-luminous display panel 1220 is an optical fingerprint sensor 1230, and the point backlight is also located above the protective layer 1210, and the point backlight is located beside the self-luminous display panel 1220 and the optical fingerprint sensor 1230.

When the bottom view structure shown in FIG. 12 is cut and placed as shown in FIG. 1 to FIG. 10, the display module provided in the embodiment can also be seen: the self-luminous display panel 1220 is located under the protective layer 1210. The optical fingerprint sensor 1230 is located below the self-luminous display panel 1220; the light can pass through the self-luminous display panel 1220 from top to bottom; the point backlight is located under the protective layer 1210, and the point backlight is located in the self-luminous display On the side of the panel 1220, the light emitted by the point-like backlight enters the protective layer 1210 at an obliquely upward angle.

The self-luminous display panel 1220 may include a first transparent substrate (not shown), a second transparent substrate (not shown), and a self-luminous circuit layer between the first transparent substrate and the second transparent substrate (not shown) Out). The self-illuminating circuit layer in the self-luminous display panel 1220 may include a plurality of display pixel units (not shown). Each display pixel unit may include at least one non-transmissive region and at least one light transmissive region.

As shown in FIG. 12, the point backlight in the embodiment is six LED lights, which are respectively an LED lamp a, an LED lamp b, an LED lamp c, an LED lamp d, an LED lamp e, and an LED lamp f, six The LED lights are evenly distributed on the same side of the optical fingerprint sensor 1230.

The optical fingerprint sensor 1230 correspondingly includes fourteen local optical sensing regions, which are local optical sensing regions 1-14, respectively. In the plane shown in Fig. 12, the optical fingerprint sensor 1230 is divided into fourteen partial optical sensing regions using thirteen dashed lines. One LED light corresponds to four local optical sensing areas. At the same time, although not shown in FIG. 12, the display module further includes a touch structure, the touch structure includes fourteen partial touch regions, and a local optical sensing region corresponds to a partial touch region, that is, local optics. The sensing area and the local touch area are in one-to-one correspondence. In the up-view plane shown in Figure 12, if local touch When the area is displayed, the corresponding partial touch area and the local optical sensing area completely coincide. The working state of the corresponding local optical sensing area (for example, switching between two states of working and non-working) can be controlled by using the local touch area, and the corresponding content of the foregoing embodiment can be referred to.

With the above structure, in the display module provided in this embodiment, the number of LED lamps is less than the number of the local optical sensing regions, and the plurality of partial optical sensing regions correspond to one LED lamp, and each of the LED lamps corresponds to multiple phases. Adjacent partial optical sensing regions, and the partial optical sensing regions corresponding to the two adjacent LED lamps are identical.

Specifically, in this embodiment, the LED lamp a corresponds to the local optical sensing area 1-4, the LED lamp b corresponds to the local optical sensing area 3-6, the LED lamp c corresponds to the local optical sensing area 5-8, and the LED lamp d corresponds to the local optical In the sensing area 7-10, the LED lamp e corresponds to the local optical sensing area 9-12, and the LED lamp f corresponds to the local optical sensing area 11-14. The width of the corresponding area of the LED lamp a to the LED lamp f is as shown by Ra to Rf in FIG. 12, and these widths can prove the corresponding relationship between the LED lamp and the local optical sensing area, that is, one LED lamp corresponds to four consecutive local optical sensing regions. . At this time, taking the adjacent LED lamp a and the LED lamp b as an example, the corresponding partial optical sensing regions are identical, that is, they all correspond to the local optical sensing regions 3-4. At the same time, "partially identical" indicates that they each correspond to different local optical sensing regions, for example, LED lamp a corresponds to local optical sensing region 1-2, and LED lamp b corresponds to local optical sensing region 5-6.

The corresponding arrangement of the above structure and the area is also because the imaging principle of the present invention shows that the display module can only use one LED light at a time when fingerprinting (if two LED lights are used at the same time) There is interference to blur the image; and if the partial optical sensing regions corresponding to two adjacent LED lamps do not have the same portion, if the finger is pressed at the boundary of the two local optical sensing regions, it usually needs to be performed. Two images were taken to obtain different partial fingerprint images and then combined together. However, this embodiment reduces the distance between the LED lamps by providing more than one LED lamp. At the same time, by further subdividing the local optical sensing area, the number of local optical sensing areas is increased, thereby achieving that: a plurality of adjacent local optical sensing areas correspond to one LED light, And the partial optical sensing regions corresponding to the two adjacent LED lamps are identical. At this time, according to the finger pressing position, only the LED lamp closest to the finger pressing position needs to be opened for fingerprint image acquisition at a time, and the most suitable one of the LED lights can be used to collect the fingerprint image, so that one imaging can be realized. Can collect the corresponding fingerprint image. Therefore, the collection efficiency and the collection effect are further improved.

In order to better achieve the above object, it is also possible to make the spacing between the LED lamps much smaller than the pressing coverage width of the fingers (for example, the spacing of the LED lamps can be less than 5 mm).

The embodiments of the present specification have many alternatives and complements. 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 display module comprising:

The protective layer;

a self-luminous display panel, the self-luminous display panel being located below the protective layer;

Characterized in that light can pass through the self-luminous display panel from top to bottom;

The display module further includes:

An optical fingerprint sensor, the optical fingerprint sensor being located below the self-luminous display panel;

a point backlight, the point backlight is located below the protective layer and on the side of the self-luminous display panel, and the light emitted by the point backlight enters the protective layer at an obliquely upward angle.
The display module as claimed in claim 1 , wherein the self-luminous display panel comprises a first transparent substrate, a second transparent substrate, and self-luminescence between the first transparent substrate and the second transparent substrate. a circuit layer, the self-luminous circuit layer comprising a plurality of display pixel units; each of the display pixel units comprising at least one non-transmissive region and at least one light transmissive region.
The display module according to claim 1, wherein a filter layer is disposed between the optical fingerprint sensor and the self-luminous display panel.
The display module as claimed in claim 1 , wherein a light-transmitting glue is disposed between the point-shaped backlight and the protective layer, and the light-transmissive glue covers a light-emitting surface of the point-shaped backlight. a portion of the lower surface of the protective layer, the light emitted by the point backlight enters the transparent adhesive from the light emitting surface of the dot backlight, and then enters the protective layer from the transparent adhesive.
The display module according to claim 4, wherein at least a portion of the lower surface of the light transmissive glue has a light absorbing layer.
The display module according to claim 4, wherein the self-luminous display panel and the protective layer have a thickening layer, the lower surface of the protective layer has a light shielding layer, and the light shielding layer is The light transmissive glue is adjacent.
The display module as claimed in claim 1 , wherein the light-emitting surface of the dot-shaped backlight has a collecting lens in front of the light-collecting lens, and the collecting lens can reduce the light of the point-shaped backlight to enter the protection. The divergence angle of the layer, the light of the point backlight first enters the collecting lens and then enters the protective layer.
The display module as claimed in claim 7 , wherein the region of the lower surface of the protective layer opposite to the point backlight further comprises an anti-reflection film, wherein the anti-reflection film can increase the dot backlight The proportion of light entering the protective layer.
The display module as claimed in claim 1 , wherein the light-emitting surface of the dot-shaped backlight has a light guiding prism, and the light emitted by the dot-shaped backlight enters from the light-emitting surface of the dot-shaped backlight. The light guiding prism enters the protective layer from the light guiding prism.
The display module according to claim 9, wherein the light incident surface of the light guiding prism is a curved surface facing the point backlight, and the upper surface of the light guiding prism is opposite to the protective layer A plane parallel to the surface, and a lower surface of the light guiding prism is a slope connecting the upper surface and the light incident surface.
The display module as claimed in claim 9 , wherein the self-luminous display panel and the protective layer have a thickening layer, and the light incident surface of the light guiding prism faces the dot backlight The upper surface of the light guiding prism is a plane parallel to the lower surface of the protective layer, and the side surface of the light guiding prism is a plane parallel to the side surface of the thickening layer, on the light guiding prism The surface is adhered to the lower surface of the protective layer, and the vertical side surface of the light guiding prism is pasted to the side surface of the thickening layer.
The display module according to claim 9, wherein a thickening layer is disposed between the self-luminous display panel and the protective layer, and the light guiding prism The light incident surface is a curved surface facing the point backlight, the upper surface of the light guiding prism is a plane parallel to the lower surface of the protective layer, and the side surface of the light guiding prism is opposite to the thickening layer The upper surface of the light guiding prism is adhered to the lower surface of the protective layer, and the side surface of the light guiding prism is pasted to the side surface of the thickening layer.
The display module according to claim 10, wherein the lower surface of the light guiding prism has a light absorbing layer.
The display module according to claim 13, wherein the lower surface of the protective layer has a light shielding layer, and the light shielding layer is adjacent to the light guiding prism.
The display module of claim 1 , wherein the self-luminous display panel and the protective layer have a thickened layer.
The display module as claimed in claim 15 , wherein a region of the lower surface of the protective layer opposite to the dot backlight is covered by a light shielding layer, and light emitted by the dot backlight is thickened from the The side of the layer enters the thickened layer and enters the protective layer from the thickened layer.
The display module according to claim 15, wherein a lower surface of the protective layer has a light shielding layer, and a side surface of the thickened layer opposite to the dot backlight is a slope facing the dot backlight. The top of the bevel is adjacent to the light shielding layer, and the light emitted by the point backlight enters the thickening layer from the inclined surface of the thickening layer, and then enters the protective layer from the thickening layer.
The display module according to any one of claims 1 to 17, wherein the dot backlight is an LED lamp; or the dot backlight is two or more LED lamps.
The display module according to any one of claims 1 to 17, wherein the dot backlight is two or more LED lamps, and the two or more LED lamps are evenly distributed in the same optical fingerprint sensor. Side.
The display module according to claim 19, wherein the optical fingerprint sensor comprises two or more local optical sensing regions, and one of the LED lamps corresponds to one of the partial optical sensing regions; The touch structure includes two or more partial touch regions, and one of the partial optical sensing regions corresponds to one of the partial touch regions.
The display module according to claim 19, wherein the optical fingerprint sensor comprises three or more local optical sensing regions, the number of the LED lamps being less than the number of the local optical sensing regions; The group further includes a touch structure, the touch structure includes three or more partial touch regions, and one of the partial optical sensing regions corresponds to one of the partial touch regions.
The display module as claimed in claim 21, wherein each of the LED lamps corresponds to a plurality of adjacent partial optical sensing regions; and the partial opticals corresponding to two adjacent LED lamps The sensing area is partially the same.