Display device

Abstract

The application discloses a display device, which comprises a display screen, a composite functional layer and a distance sensor; the composite functional layer is located at the back of the display screen, and two light transmission holes, including a first light transmission hole and a second light transmission hole, are arranged on the composite functional layer; the distance sensor is located on the side of the composite functional layer away from the display screen and comprises an emitter and a receiver arranged correspondingly to the first light transmission hole and the second light transmission hole; the display device further comprises a light shielding layer in contact with the composite functional layer, which is configured to prevent the light emitted by the emitter from transmitting to the receiver through the first light transmission hole, the composite functional layer and the second light transmission hole in sequence. The application can effectively reduce the internal noise in the signal received by the distance sensor, improve the signal-to-noise ratio, avoid the screen false-off phenomenon caused by the noise signal exceeding the preset threshold, and improve the detection accuracy of the distance sensor and the user experience.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a display device. Background Technology

[0002] In the field of mobile terminal technology, proximity sensors (P-sensors) are widely used in smartphones and other electronic devices. Typically, a proximity sensor is located below the phone screen and is used to detect the distance between the phone and the user's face when making or receiving calls, thereby enabling automatic switching between screen brightness levels. Specifically, when the user brings the phone close to their face, the proximity sensor detects an obstruction and the system automatically turns off the screen to prevent accidental touches during a call; when the phone moves away from the face, the system automatically turns the screen on for normal user operation.

[0003] The working principle of a distance sensor is as follows: The transmitter (usually an infrared light-emitting diode, IR LED) emits an infrared light signal. This signal is reflected and conducted through various interfaces such as the cover glass, and is finally received by the receiver (usually a photodiode). The signal strength received by the receiver can be expressed as: S = A + B; where S is the total signal strength received by the receiver, A is the required signal, i.e., the effective infrared light signal reflected back from the target obstruction, and B is the noise CT value, i.e., the background noise signal generated by factors such as reflection from the cover glass and crosstalk in the internal optical path.

[0004] When the internal noise B of the receiver exceeds a certain preset threshold (e.g., 9000), even if there is no actual obstruction in front of the screen, the system may misinterpret the noise signal as an approaching object, causing the screen to abnormally turn off when there is no obstruction. This phenomenon seriously affects the normal user experience, such as the screen failing to turn back on normally after unexpectedly turning off during a call, or frequent abnormal screen shutdowns in non-call scenarios. Therefore, how to effectively reduce the internal noise in the distance sensor's received signal, improve the signal-to-noise ratio, avoid screen shutdowns caused by noise exceeding the preset threshold, and improve the detection accuracy of the distance sensor and the user experience has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] This application provides a display device that can effectively reduce internal noise in the signal received by the distance sensor, improve the signal-to-noise ratio, avoid screen malfunction caused by noise signals exceeding a preset threshold, and improve the detection accuracy of the distance sensor and the user experience.

[0006] To achieve the above objectives, this application provides a display device, comprising: Display screen; A composite functional layer is located on the back of the display screen, and the composite functional layer is provided with two light-transmitting holes that penetrate the composite functional layer; the two light-transmitting holes include a first light-transmitting hole and a second light-transmitting hole; A distance sensor is located on the side of the composite functional layer opposite to the display screen, and includes a transmitter and a receiver respectively corresponding to the first light-transmitting hole and the second light-transmitting hole; The display device further includes a light-shielding layer in contact with the composite functional layer, the light-shielding layer being configured to prevent light emitted by the transmitter from being transmitted sequentially from the first light-transmitting hole, the composite functional layer and the second light-transmitting hole to the receiver.

[0007] Optionally, the wall of each light-transmitting hole includes a first hole wall and a second hole wall connected to each other, wherein the first hole wall is disposed close to the other light-transmitting hole and the second hole wall is disposed away from the other light-transmitting hole; The light-shielding layer includes at least one main light-shielding part; the main light-shielding part is disposed on the first hole wall of at least one of the light-transmitting holes, or the main light-shielding part is disposed on the first hole wall and the second hole wall of at least one of the light-transmitting holes.

[0008] Optionally, the composite functional layer includes a first buffer layer and a transparent adhesive layer, the transparent adhesive layer being located between the first buffer layer and the display screen, and the light-transmitting hole passing through both the first buffer layer and the transparent adhesive layer; The transparent adhesive layer includes a first sidewall surrounding the light-transmitting hole, and the main light-blocking part is at least disposed on the first sidewall.

[0009] Optionally, the first buffer layer includes a second sidewall surrounding the light-transmitting hole, and the main light-shielding part is also disposed on the second sidewall.

[0010] Optionally, in the arrangement direction of the first light-transmitting hole and the second light-transmitting hole, the thickness of the main body light-blocking part located on the first sidewall is greater than or equal to the thickness of the main body light-blocking part located on the second sidewall.

[0011] Optionally, the composite functional layer further includes a heat dissipation layer located on the side of the first buffer layer away from the transparent adhesive layer. The heat dissipation layer includes a third sidewall surrounding the light-transmitting hole, and the main body light-shielding part is also disposed on the third sidewall.

[0012] Optionally, in the arrangement direction of the first light-transmitting hole and the second light-transmitting hole, the thickness of the main body light-blocking part located on the second sidewall is greater than or equal to the thickness of the main body light-blocking part located on the third sidewall.

[0013] Optionally, in the thickness direction of the composite functional layer, the side of the main body light-shielding portion near the distance sensor is recessed relative to the side of the heat dissipation layer near the distance sensor.

[0014] Optionally, the material of the first buffer layer includes a light-shielding material.

[0015] Optionally, the main body light-shielding portion includes a top surface and a bottom surface disposed opposite to each other along the thickness direction of the display device, and a side surface connecting the top surface and the bottom surface; the side surface is in contact with at least the first hole wall, and the top surface is in contact with the display screen.

[0016] Optionally, the display screen includes a back panel and a display panel, the back panel being located between the composite functional layer and the display panel, and the top surface of the light-shielding layer contacting the back panel.

[0017] Optionally, the light-shielding layer further includes at least one extended light-shielding portion, which is connected to the main light-shielding portion and is located on the side of the composite functional layer opposite to the display screen.

[0018] Optionally, in the arrangement direction of the first light-transmitting hole and the second light-transmitting hole, the thickness of the extended light-blocking portion is less than the maximum thickness of the main light-blocking portion.

[0019] Optionally, in the arrangement direction of the first light-transmitting hole and the second light-transmitting hole, the thickness of the main light-shielding part is greater than 0 and less than or equal to 0.3 mm, and the thickness of the extended light-shielding part is less than or equal to 0.2 mm; in the thickness direction of the display device, the height of the extended light-shielding part is less than or equal to 0.1 mm.

[0020] Optionally, the light-shielding layer includes two main light-shielding parts and two extended light-shielding parts. The two main light-shielding parts are respectively located in the first light-transmitting hole and the second light-transmitting hole, and are respectively connected to the two extended light-shielding parts.

[0021] Optionally, the material of the light-shielding layer is selected from black adhesive or black ink.

[0022] Optionally, the composite functional layer includes a first composite functional part located between the first light-transmitting hole and the second light-transmitting hole, a second composite functional part located on the side of the first light-transmitting hole away from the second light-transmitting hole, and a third composite functional part located on the side of the second light-transmitting hole away from the first light-transmitting hole. The display device further includes a housing and a second buffer layer. The housing is located on the side of the composite functional layer opposite to the display screen, and the second buffer layer is located at least between the housing and the first composite functional layer. The material of the second buffer layer is a light-shielding material.

[0023] In the display device of this application embodiment, by providing a light-shielding layer that contacts the composite functional layer in the display device, the possible light leakage paths on the composite functional layer can be blocked, preventing the light emitted by the transmitter from being transmitted sequentially from the first light-transmitting hole, the composite functional layer, and the second light-transmitting hole to the receiver. This can effectively reduce the internal noise in the signal received by the distance sensor, improve the signal-to-noise ratio, avoid the phenomenon of screen turning off due to noise signals exceeding a preset threshold, and improve the detection accuracy of the distance sensor and the user experience.

[0024] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0026] Figure 1 This is a partial cross-sectional structural diagram of an exemplary display device provided in this application; Figure 2 This is a schematic diagram of a first partial cross-sectional structure of the display device provided in the embodiments of this application; Figure 3 This is a schematic diagram of a second partial cross-sectional structure of the display device provided in the embodiments of this application; Figure 4 This is a schematic diagram of a first partial cross-sectional structure of the composite functional layer, back plate, and light-shielding layer of the display device provided in the embodiments of this application; Figure 5 This is a schematic diagram of a third partial cross-sectional structure of the display device provided in the embodiments of this application; Figure 6 This is a schematic diagram of a second partial cross-sectional structure of the composite functional layer, back plate, and light-shielding layer of the display device provided in the embodiments of this application; Figure 7 This is a first top view of the first light-transmitting hole and the light-shielding layer provided in the embodiments of this application; Figure 8 This is a second top view of the first light-transmitting hole and the light-shielding layer provided in the embodiments of this application; Figure 9This is a schematic diagram of the internal noise CT test results of the display device provided in Comparative Example 1, Example 1 and Example 2 of this application.

[0027] Explanation of reference numerals in the attached figures: 100. Display device; 10. Display screen; 11. Back panel; 12. Display panel; 13. Polarizing film; 14. Optical adhesive layer; 15. Protective cover; 20. Composite functional layer; 201. First composite functional part; 202. Second composite functional part; 203. Third composite functional part; 21. First buffer layer; 211. Second sidewall; 22. Transparent adhesive layer; 221. First sidewall; 23. Heat dissipation layer; 231. Third sidewall; 24. First hole wall; 25. Second hole wall; 30. Distance sensor; 31. Transmitter; 32. Receiver; 40. Light shielding layer; 41. Main light shielding part; 411. Top surface; 412. Bottom surface; 413. Side surface; 42. Extended light shielding part; 50. Housing; 60. Second buffer layer; 70. Target obstruction; H1, first light-transmitting hole; H2, second light-transmitting hole. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0029] A schematic diagram of a partial cross-sectional structure of an exemplary display device is shown below. Figure 1 As shown. The display device 100' includes a display screen 10 and a first buffer layer (e.g., black foam) 21 and a heat dissipation layer (e.g., copper) 23 disposed on the back of the display screen 10. A transparent adhesive layer (e.g., Embo glue) 22 is disposed between the backplane (BP) 11 of the display screen 10 and the first buffer layer 21 to achieve bonding and fixation between the various structural layers. A distance sensor 30 is disposed on the side of the housing 50 near the display screen 10, and the transmitter 31 and receiver 32 of the distance sensor 30 are respectively disposed corresponding to the first light-transmitting hole (emitting hole) H1 and the second light-transmitting hole (receiving hole) H2 on the screen. A second buffer layer 60 is also provided between the housing 50 and the heat dissipation layer 23.

[0030] like Figure 1 As shown, after the infrared light signal is emitted from the transmitter 31, the light signal propagates through multiple interfaces such as the back plate 11, display panel 12, polarizer 13, optical adhesive layer 14, protective cover plate 15, and target obstruction 70 of the display screen 10, and is finally received by the receiver 32.

[0031] Specifically, the signal strength received by receiver 32 can be expressed as: S=A+B; where S is the total signal strength received by receiver 32, A is the required signal, that is, the effective infrared light signal reflected back by the target obstruction 70, and B is the internal noise, specifically manifested as the noise CT value, that is, the background noise signal generated by factors such as reflection from the cover glass and crosstalk in the internal optical path.

[0032] However, in Figure 1 In the structural design shown, when the bonding effect of the transparent adhesive layer 22 is poor, i.e., there are problems such as air bubbles, uneven interface, or loose bonding between the transparent adhesive layer 22 and adjacent layers (e.g., back plate 11), abnormal propagation of the infrared light signal will occur at the interface of the medium. Specifically, when the distance between the first light-transmitting hole (emitting hole) H1 and the second light-transmitting hole (receiving hole) H2 is set too small, the infrared light signal emitted by the transmitter 31 is prone to total internal reflection at the interface between the transparent adhesive layer 22 and the adjacent layer when propagating inside the transparent adhesive layer 22. According to the principle of total internal reflection, when the light signal is incident from an optically dense medium (such as the transparent adhesive layer 22) to an optically sparse medium (such as an air gap or a poorly bonded interface layer) and the angle of incidence is greater than the critical angle, the light signal will be completely reflected back into the original medium and cannot be transmitted normally.

[0033] These totally reflected light signals no longer propagate outward along the preset path (i.e., towards the screen surface). Instead, after multiple reflections within the transparent adhesive layer 22, they ultimately propagate to the receiver 32 along an unexpected light path, forming unwanted noise signals. This noise signal is superimposed on the total signal strength (S) received by the receiver 32, causing a significant increase in the internal noise (i.e., the B value) received by the receiver 32, exceeding the preset threshold of the noise CT value (e.g., 9000). This results in the screen misinterpreting the presence of an object when there is no actual obstruction, leading to abnormal screen shutdown and other adverse phenomena.

[0034] Therefore, the embodiments of this application provide Figure 1 The structure shown has been improved, which can effectively reduce the internal noise in the signal received by the distance sensor, improve the signal-to-noise ratio, avoid the screen turning off accidentally due to noise signals exceeding the preset threshold, and improve the detection accuracy of the distance sensor and the user experience.

[0035] like Figure 2As shown, this application embodiment provides a display device 100, which includes a display screen 10, a composite functional layer 20, and a distance sensor 30. The composite functional layer 20 is located on the back of the display screen 10, and the composite functional layer 20 has two light-transmitting holes penetrating the composite functional layer 20, including a first light-transmitting hole H1 and a second light-transmitting hole H2. The distance sensor 30 is located on the side of the composite functional layer 20 opposite to the display screen 10, and includes a transmitter 31 and a receiver 32 respectively disposed corresponding to the first light-transmitting hole H1 and the second light-transmitting hole H2.

[0036] The display device 100 also includes a light-shielding layer 40 that contacts the composite functional layer 20. The light-shielding layer 40 is configured to prevent light emitted by the transmitter 31 from being transmitted sequentially from the first light-transmitting hole H1, the composite functional layer 20, and the second light-transmitting hole H2 to the receiver 32.

[0037] Understandably, the display screen 10 includes two sides arranged opposite to each other, one side being the light-emitting side and the other side being the back of the display screen 10, i.e., the side facing away from the light-emitting side. The two light-transmitting holes on the composite functional layer 20 are respectively the emitting hole and the receiving hole that allow light signals to pass through. For example, the first light-transmitting hole H1 is the emitting hole, and the second light-transmitting hole H2 is the receiving hole.

[0038] In this embodiment, by providing a light-shielding layer 40 in the display device 100 that contacts the composite functional layer 20, the possible light leakage paths on the composite functional layer 20 can be blocked, preventing the light emitted by the transmitter 31 from being transmitted sequentially from the first light-transmitting hole H1, the composite functional layer 20, and the second light-transmitting hole H2 to the receiver 32. This can effectively reduce the internal noise in the signal received by the distance sensor 30, improve the signal-to-noise ratio, avoid the screen turning off accidentally due to noise signals exceeding a preset threshold, and improve the detection accuracy of the distance sensor 30 and the user experience.

[0039] In some embodiments, such as Figure 4 , Figure 7 and Figure 8 As shown, the walls of each light-transmitting hole (e.g., the first light-transmitting hole H1 and the second light-transmitting hole H2) include a first hole wall 24 and a second hole wall 25 connected to each other. The first hole wall 24 is disposed close to the other light-transmitting hole, and the second hole wall 25 is disposed away from the other light-transmitting hole. The light-shielding layer 40 includes at least one main light-shielding part 41; the main light-shielding part 41 is disposed on the first hole wall 24 of at least one light-transmitting hole, or the main light-shielding part 41 is disposed on the first hole wall 24 and the second hole wall 25 of at least one light-transmitting hole.

[0040] Understandably, the first wall 24 of the first light-transmitting hole H1 is disposed close to the second light-transmitting hole H2, and the second wall 25 of the first light-transmitting hole H1 is disposed away from the second light-transmitting hole H2; similarly, the first wall 24 of the second light-transmitting hole H2 is disposed close to the first light-transmitting hole H1, and the second wall 25 of the second light-transmitting hole H2 is disposed away from the first light-transmitting hole H1. In other words, this embodiment divides the hole wall of each light-transmitting hole into two parts based on whether it is close to another light-transmitting hole. Furthermore, the main light-blocking portion 41 of the light-blocking layer 40 is located inside the light-transmitting hole, and the main light-blocking portion 41 is at least disposed on the first hole wall 24.

[0041] In one specific embodiment, such as Figure 7 As shown, the light-shielding layer 40 includes a main light-shielding part 41, which is disposed on the first hole wall 24 of the first light-transmitting hole H1, or the main light-shielding part 41 is disposed on the first hole wall 24 of the second light-transmitting hole H2.

[0042] Since the path of internal noise generation includes the light emitted by the transmitter 31 sequentially passing through the first light-transmitting hole H1, the composite functional layer 20, and the second light-transmitting hole H2 to the receiver 32, the probability of the light signal incident on the first hole wall 24 reaching the receiver 32 is greater. In this embodiment, by placing the main light-shielding part 41 of the light-shielding layer 40 on the first hole wall 24 of the first light-transmitting hole H1 or the second light-transmitting hole H2, the probability of blocking the light emitted by the transmitter 31 from sequentially passing through the first light-transmitting hole H1, the composite functional layer 20, and the second light-transmitting hole H2 to the receiver 32 is significantly reduced, thereby effectively reducing the internal noise of the display device 100. Furthermore, placing only the main light-shielding part 41 of the light-shielding layer 40 on the path of internal noise generation can effectively reduce internal noise while saving light-shielding material, thus reducing material costs.

[0043] In another specific embodiment, such as Figure 8 As shown, the main body light-blocking part 41 is disposed on the first hole wall 24 and the second hole wall 25 of the first light-transmitting hole H1, or the main body light-blocking part 41 is disposed on the first hole wall 24 and the second hole wall 25 of the second light-transmitting hole H2.

[0044] By disposing a main light-shielding portion 41 of the light-shielding layer 40 on the first hole wall 24 and the second hole wall 25 of the first light-transmitting hole H1 or the second light-transmitting hole H2, it is equivalent to setting a ring of main light-shielding portions 41 on the hole wall of the first light-transmitting hole H1 or the second light-transmitting hole H2. This can block the light emitted by the transmitter 31 from reaching the receiver 32 through any position on the hole wall of the first light-transmitting hole H1 or the second light-transmitting hole H2, that is, blocking the light leakage path in all directions within the light-transmitting hole, which can further reduce the internal noise of the display device 100. At the same time, the process of setting a whole ring of main light-shielding portions 41 on the hole wall of the first light-transmitting hole H1 or the second light-transmitting hole H2 is simpler and helps to reduce manufacturing costs.

[0045] In another specific embodiment, such as Figure 3 and Figure 4 As shown, the light-shielding layer 40 includes two main light-shielding parts 41. One main light-shielding part 41 is disposed on the first hole wall 24 of the first light-transmitting hole H1, and the other main light-shielding part 41 is disposed on the first hole wall 24 of the second light-transmitting hole H2. By simultaneously disposing the main light-shielding parts 41 on the first hole walls 24 of both the first light-transmitting hole H1 and the second light-transmitting hole H2, the light leakage path can be blocked at both the entrance hole and the receiving hole, which helps to further reduce the internal noise of the display device 100 and also helps to save material in the light-shielding layer 40, thus reducing material costs.

[0046] In another specific embodiment, the light-shielding layer 40 includes two main light-shielding portions 41. One main light-shielding portion 41 is disposed on the first hole wall 24 and the second hole wall 25 of the first light-transmitting hole H1, and the other main light-shielding portion 41 is disposed on the first hole wall 24 and the second hole wall 25 of the second light-transmitting hole H2. By simultaneously disposing the main light-shielding portions 41 on the first hole wall 24 and the second hole wall 25 of the first light-transmitting hole H1 and the second light-transmitting hole H2, not only can the light leakage path be blocked in all directions within the emitting hole and the receiving hole, thereby further reducing the internal noise of the display device 100, but the manufacturing process of the light-shielding layer 40 can also be simplified, which is beneficial to reducing manufacturing costs.

[0047] In some embodiments, such as Figures 2 to 4 As shown, the composite functional layer 20 includes a first buffer layer 21 and a transparent adhesive layer 22. The transparent adhesive layer 22 is located between the first buffer layer 21 and the display screen 10, and the light-transmitting hole passes through both the first buffer layer 21 and the transparent adhesive layer 22. The transparent adhesive layer 22 includes a first sidewall 221 surrounding the light-transmitting hole, and the main light-shielding part 41 is at least disposed on the first sidewall 221.

[0048] Specifically, the transparent adhesive layer 22 is used to fix the first buffer layer 21 to the back of the display screen 10.

[0049] By setting the main light-shielding part 41 on the first sidewall 221 of the transparent adhesive layer 22 surrounding the light-transmitting hole, the poor adhesion of the transparent adhesive layer 22 can effectively prevent the infrared light signal emitted by the transmitter 31 from being received by the receiving layer after multiple reflections by the transparent adhesive layer 22 and adjacent layers, thereby effectively reducing the internal noise caused by the transparent adhesive layer 22.

[0050] In some embodiments, such as Figure 4 As shown, the first buffer layer 21 includes a second sidewall 211 arranged around the light-transmitting hole, and the main body light-shielding part 41 is also arranged on the second sidewall 211.

[0051] By placing the main light-shielding part 41 on the first sidewall 221 of the transparent adhesive layer 22 surrounding the light-transmitting hole and the second sidewall 211 of the first buffer layer 21 surrounding the light-transmitting hole, the internal noise caused by the transparent adhesive layer 22 and the first buffer layer 21 can be effectively reduced.

[0052] In some embodiments, such as Figure 2 and Figure 4 As shown, the arrangement direction of the first light-transmitting hole H1 and the second light-transmitting hole H2 (e.g.) Figure 2 In the horizontal direction, the thickness of the main body light-shielding part 41 located on the first side wall 221 is greater than or equal to the thickness of the main body light-shielding part 41 located on the second side wall 211.

[0053] Since the light transmittance of the transparent adhesive layer 22 is much higher than that of the first buffer layer 21, the probability of light leakage caused by the transparent adhesive layer 22 is greater. In this embodiment, the thickness of the main light-blocking part 41 located on the transparent adhesive layer 22 is designed to be thicker, which is beneficial to improve the light-blocking effect of the light-blocking layer 40 on the first sidewall 221, so that the light-blocking effect of the light-blocking layer 40 on the first sidewall 221 and the second side is more balanced, thereby helping to further reduce the internal noise caused by the transparent adhesive layer 22 and the first buffer layer 21.

[0054] In some embodiments, such as Figures 2 to 4 As shown, the composite functional layer 20 also includes a heat dissipation layer 23, which is located on the side of the first buffer layer 21 away from the transparent adhesive layer 22. The heat dissipation layer 23 includes a third sidewall 231 arranged around the light-transmitting hole, and the main body light-shielding part 41 is also arranged on the third sidewall 231.

[0055] By setting the main light-shielding part 41 on the first sidewall 221 of the transparent adhesive layer 22 surrounding the light-transmitting hole, the second sidewall 211 of the first buffer layer 21 surrounding the light-transmitting hole, and the third sidewall 231 of the heat dissipation layer 23 surrounding the light-transmitting hole, the internal noise caused by the transparent adhesive layer 22, the first buffer layer 21, and the heat dissipation layer 23 can be effectively reduced.

[0056] Understandably, the portions of the first sidewall 221, the second sidewall 211, and the third sidewall 231 arranged around the same light-transmitting hole that are close to another light-transmitting hole are equivalent to the first hole wall 24 of the light-transmitting hole they surround.

[0057] In some embodiments, such as Figure 2 and Figure 4 As shown, in the arrangement direction of the first light-transmitting hole H1 and the second light-transmitting hole H2, the thickness of the main body light-blocking part 41 located on the second side wall 211 is greater than or equal to the thickness of the main body light-blocking part 41 located on the third side wall 231.

[0058] In other words, the thickness of the main light-blocking part 41 inside the light-transmitting hole gradually increases along the direction from the heat dissipation layer 23 to the transparent adhesive layer 22 in the direction of the arrangement of the first light-transmitting hole H1 and the second light-transmitting hole H2.

[0059] On the one hand, since the heat dissipation layer 23 is usually made of metal, it has good light-shielding performance. Reducing the thickness of the main light-shielding part 41 located on the third sidewall 231 will not reduce the overall light-shielding effect of the heat dissipation layer 23 and the light-shielding layer 40, and it is also beneficial to save material of the light-shielding layer 40, which helps to reduce material costs. On the other hand, when manufacturing the light-shielding layer 40, a composite functional layer 20 with a first light-transmitting hole H1 and a second light-transmitting hole H2 can be formed on the back of the display screen 10. Then, the display screen 10 is flipped so that the light-emitting side of the display screen 10 faces down and the openings of the first light-transmitting hole H1 and the second light-transmitting hole H2 face up. Subsequently, the light-shielding material is formed on the hole walls of the first light-transmitting hole H1 and / or the second light-transmitting hole H2 by coating or other processes. Due to gravity, the light-shielding material will flow towards the display screen 10, resulting in the thickness of the cured light-shielding layer 40 on the side closer to the display screen 10 being greater than the thickness on the side farther away from the display screen 10.

[0060] In some embodiments, in the thickness direction of the composite functional layer 20, the main light-shielding portion 41 is recessed relative to the side of the heat dissipation layer 23 near the distance sensor 30. That is, the main light-shielding portion 41 only covers a portion of the third sidewall 231 of the heat dissipation layer 23, specifically the portion of the third sidewall 231 near the second sidewall 211. This design helps to further save light-shielding material without affecting the overall light-shielding effect of the composite functional layer 20 and the light-shielding layer 40.

[0061] In some embodiments, the material of the first buffer layer 21 includes a light-shielding material, such as black foam, but is not limited thereto.

[0062] In some embodiments, the first buffer layer 21 includes a substrate and a black foam layer, wherein the substrate is located between the transparent adhesive layer 22 and the black foam layer. The material of the substrate includes, but is not limited to, polyethylene terephthalate (PET). Of course, the structure of the first buffer layer 21 is not limited to this.

[0063] In some embodiments, the material of the heat dissipation layer 23 includes metallic copper, but is not limited thereto.

[0064] In some embodiments, such as Figure 2 and Figure 4As shown, the main body light-shielding part 41 includes a top surface 411 and a bottom surface 412 disposed opposite to each other along the thickness direction of the display device 100, and a side surface 413 connecting the top surface 411 and the bottom surface 412; the side surface 413 is in contact with at least the first hole wall 24, and the top surface 411 is in contact with the display screen 10.

[0065] Specifically, the top surface 411 of the main light-shielding part 41 is fitted to the back of the display screen 10, and the side surface 413 of the main light-shielding part 41 is fitted to the first hole wall 24 (i.e., the side wall of the composite functional layer 20 surrounding the light-transmitting hole) of the first light-transmitting hole H1 and / or the second light-transmitting hole H2. This design can completely block the light leakage path between the composite functional layer 20 and the display screen 10, which is beneficial to more effectively blocking the light emitted by the emitter 31 from being transmitted sequentially from the first light-transmitting hole H1, the composite functional layer 20 and the second light-transmitting hole H2 to the receiver 32, thereby effectively reducing the internal noise of the display device 100.

[0066] In some embodiments, such as Figure 2 and Figure 4 As shown, the display screen 10 includes a back panel 11 and a display panel 12. The back panel 11 is located between the composite functional layer 20 and the display panel 12, and the top surface 411 of the light-shielding layer 40 contacts the back panel 11. This design can completely block the light leakage path between the composite functional layer 20 and the back panel 11 of the display screen 10, which is beneficial for more effectively blocking the light emitted by the emitter 31 from being transmitted sequentially through the first light-transmitting hole H1, the composite functional layer 20 and the second light-transmitting hole H2 to the receiver 32, thereby effectively reducing the internal noise of the display device 100.

[0067] In some embodiments, such as Figure 5 and Figure 6 As shown, the light-shielding layer 40 also includes at least one extended light-shielding portion 42, which is connected to the main light-shielding portion 41, and the extended light-shielding portion 42 is located on the side of the composite functional layer 20 away from the display screen 10.

[0068] In other words, the light-shielding layer 40 is composed of a main light-shielding part 41 that covers at least the first hole wall 24 of the light-transmitting hole and an extended light-shielding part 42 that extends to the side of the composite functional layer 20 away from the display screen 10. The main light-shielding part 41 and the extended light-shielding part 42 are connected as a whole, so that the light-shielding layer 40 can block the light emitted by the transmitter 31 from being transmitted to the receiver 32 through the first hole wall 24 of the light-transmitting hole, and can also block the light emitted by the transmitter 31 from being transmitted to the receiver 32 through the side of the composite functional layer 20 away from the display screen 10. This is beneficial to further block the light leakage path, thereby more effectively reducing the internal noise of the display device 100.

[0069] Understandably, when the composite functional layer 20 is composed of the aforementioned transparent adhesive layer 22, the first buffer layer 21 and the heat dissipation layer 23, the extended light-shielding portion 42 is located on the side of the heat dissipation layer 23 closer to the distance sensor 30.

[0070] In some embodiments, such as Figure 6 As shown, in the arrangement direction of the first light-transmitting hole H1 and the second light-transmitting hole H2, the thickness d2 of the extended light-shielding portion 42 is less than the maximum thickness d1 of the main light-shielding portion 41. This design can prevent the extended light-shielding portion 42 from occupying too large an area on the side of the composite functional layer 20 near the distance sensor 30, thereby affecting the heat dissipation effect of the composite functional layer 20 or affecting the setting of other structures.

[0071] In some embodiments, in the arrangement direction of the first light-transmitting hole H1 and the second light-transmitting hole H2, the thickness d1 of the main light-blocking portion 41 is greater than 0 and less than or equal to 0.3 mm, and the thickness d2 of the extended light-blocking portion 42 is less than or equal to 0.2 mm; in the thickness direction of the display device 100, the height h of the extended light-blocking portion 42 is less than or equal to 0.1 mm. This design can effectively prevent light emitted by the emitter 31 from being transmitted sequentially from the first light-transmitting hole H1, the composite functional layer 20, and the second light-transmitting hole H2 to the receiver 32 without affecting the normal function of the light-transmitting holes and the composite functional layer 20.

[0072] In some embodiments, the light-shielding layer 40 includes two main light-shielding portions 41 and two extended light-shielding portions 42. The two main light-shielding portions 41 are respectively located in the first light-transmitting hole H1 and the second light-transmitting hole H2, and are respectively connected to the two extended light-shielding portions 42.

[0073] In other words, both the first light-transmitting hole H1 and the second light-transmitting hole H2 have a main light-shielding part 41 on their first hole walls 24, and each main light-shielding part 41 extends toward the side of the composite functional layer 20 near the distance sensor 30 to form an extended light-shielding part 42. This arrangement achieves a dual light-shielding effect on the light leakage path, which can more effectively reduce the internal noise of the display device 100.

[0074] In some embodiments, the material of the light-shielding layer 40 is selected from black adhesive or black ink.

[0075] When the material of the light-shielding layer 40 is selected from black adhesive material, processes such as dispensing can be used to manufacture the light-shielding layer 40, but it is not limited to these methods. When the material of the light-shielding layer 40 is selected from black ink, processes such as coating can be used to manufacture the light-shielding layer 40, but it is not limited to these methods.

[0076] In some embodiments, such as Figure 2As shown, the composite functional layer 20 includes a first composite functional part 201 located between the first light-transmitting hole H1 and the second light-transmitting hole H2, a second composite functional part 202 located on the side of the first light-transmitting hole H1 away from the second light-transmitting hole H2, and a third composite functional part 203 located on the side of the second light-transmitting hole H2 away from the first light-transmitting hole H1.

[0077] The display device 100 also includes a housing 50 and a second buffer layer 60. The housing 50 is located on the side of the composite functional layer 20 away from the display screen 10, and the second buffer layer 60 is located at least between the housing 50 and the first composite functional part 201. The material of the second buffer layer 60 is a light-shielding material.

[0078] Understandably, since the distance sensor 30 and the composite functional layer 20 are greater than zero, the light emitted by the transmitter 31 may be directly reflected by the composite functional layer 20 (e.g., the first composite functional part 201) on the side closest to the distance sensor 30 and received by the receiver 32, thereby increasing the internal noise.

[0079] In this embodiment, a second buffer layer 60 with a light-shielding effect is provided between the housing 50 and the first composite functional part 201. This layer can provide support and buffering, as well as light-shielding, preventing the light emitted by the transmitter 31 from being directly transmitted to the receiver 32 through the composite functional layer 20, thereby effectively reducing the internal noise of the display device 100.

[0080] In some embodiments, the distance sensor 30 is located on the side of the housing 50 closer to the display screen 10, but is not limited thereto.

[0081] It should be noted that the embodiments of this application do not limit the specific position and connection relationship of the distance sensor 30 on the housing 50.

[0082] In some embodiments, such as Figure 2 As shown, the display screen 10 also includes a display panel 12, a polarizer 13, an optical adhesive layer 14, and a protective cover 15 located on the side of the back panel 11 away from the composite functional layer 20, but is not limited thereto.

[0083] It is understood that the polarizer 13 in the display screen 10 can be replaced by a color filter, and the material of the protective cover 15 includes glass or ultra-thin glass, but is not limited thereto. This application embodiment does not limit the specific structure of the display screen 10; the above is merely illustrative.

[0084] This application also verifies the improvement effect of the internal noise of the display device 100 in the embodiments of this application through Comparative Example 1, Example 1 and Example 2.

[0085] Specifically, the structure of the display device provided in Comparative Example 1 is as follows: Figure 1As shown. The structure of the display device provided in Embodiment 1 is as follows. Figure 2 As shown, the light-shielding layer 40 is made of black adhesive material, and it is formed by applying hot melt adhesive. The structure of the display device provided in Embodiment 2 is as follows... Figure 2 As shown, the difference from Example 1 is that the material of the light-shielding layer 40 is black ink, and the light-shielding layer 40 is formed by applying black ink with a black marker.

[0086] It is understood that the display device provided in Comparative Example 1 does not contain the light-shielding layer 40 described in the embodiments of this application; the only difference between the display devices provided in Embodiment 1 and Embodiment 2 is the material and manufacturing process of the light-shielding layer 40.

[0087] It should be noted that in the display devices provided in Comparative Example 1, Example 1 and Example 2, the protective cover 15 is a glass cover with a thickness of 600 micrometers, the optical adhesive layer 14 has a thickness of 150 micrometers, the polarizer 13 has a thickness of 105 micrometers, the display panel 12 has a thickness of 40 micrometers, the back plate 11 has a thickness of 88 micrometers, the transparent adhesive layer 22 has a thickness of 40 micrometers, the buffer layer has a thickness of 100 micrometers, and the heat dissipation layer (copper material) 23 has a thickness of 50 micrometers.

[0088] This application tested the internal noise CT value of the display devices provided in Comparative Example 1, Example 1, and Example 2, and the results are as follows: Figure 9 As shown.

[0089] according to Figure 9 It can be seen that, compared with the noise CT value of the display device provided in Comparative Example 1, the internal noise CT value of the display device provided in Example 1 is reduced by approximately 3600, and the internal noise CT value of the display device provided in Example 2 is reduced by approximately 4200. Therefore, it can be seen that both types of light-shielding layers 40 can effectively reduce the internal noise CT value of the display device. Furthermore, comparing Example 1 and Example 2, it can be seen that using black ink to make the light-shielding layer 40 can more effectively reduce the internal noise CT value of the display device.

[0090] In this embodiment, by providing a light-shielding layer 40 within the light-transmitting hole penetrating the composite functional layer 20, the light emitted by the transmitter 31 can be effectively prevented from sequentially transmitting from the first light-transmitting hole H1, the composite functional layer 20, and the second light-transmitting hole H2 to the receiver 32. This effectively reduces the internal noise in the signal received by the distance sensor 30, at least reducing the internal noise CT value of the display device 100 by 3600 to 4200, improving the signal-to-noise ratio, avoiding screen malfunctions caused by noise signals exceeding a preset threshold, and enhancing the detection accuracy of the distance sensor 30 and the user experience.

[0091] This application also provides a display device, which differs from the previous embodiments in that a light-shielding layer is disposed between the first composite functional unit and the display screen.

[0092] In this embodiment, since the light-shielding layer is located between the first composite functional unit and the display screen, even if the light emitted by the transmitter enters the transparent adhesive layer, it can be absorbed by the light-shielding layer at least partially. This can prevent the light emitted by the transmitter from being transmitted to the receiver sequentially through the first light-transmitting hole, the composite functional layer, and the second light-transmitting hole, thereby reducing the internal noise of the display device.

[0093] This application also provides a display device, which differs from the previous embodiments in that the light-shielding layer is located between the first buffer layer of the first composite functional part and the display screen, and the transparent adhesive layer is disposed in the same layer as the light-shielding layer.

[0094] In this embodiment, by setting the light-shielding layer and the transparent adhesive layer in the same layer, the light emitted by the transmitter can be effectively prevented from being transmitted to the receiver sequentially through the first light-transmitting hole, the composite functional layer and the second light-transmitting hole, thereby reducing the internal noise of the display device.

[0095] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0096] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0097] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0098] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display device, characterized in that, include: Display screen; A composite functional layer is located on the back of the display screen, and the composite functional layer is provided with two light-transmitting holes that penetrate the composite functional layer; the two light-transmitting holes include a first light-transmitting hole and a second light-transmitting hole; A distance sensor is located on the side of the composite functional layer opposite to the display screen, and includes a transmitter and a receiver respectively corresponding to the first light-transmitting hole and the second light-transmitting hole; The display device further includes a light-shielding layer in contact with the composite functional layer, the light-shielding layer being configured to prevent light emitted by the transmitter from being transmitted sequentially from the first light-transmitting hole, the composite functional layer and the second light-transmitting hole to the receiver.

2. The display device according to claim 1, characterized in that, Each of the light-transmitting holes has a wall including a first hole wall and a second hole wall that are connected to each other. The first hole wall is disposed close to the other light-transmitting hole, and the second hole wall is disposed away from the other light-transmitting hole. The light-shielding layer includes at least one main light-shielding part; the main light-shielding part is disposed on the first hole wall of at least one of the light-transmitting holes, or the main light-shielding part is disposed on the first hole wall and the second hole wall of at least one of the light-transmitting holes.

3. The display device according to claim 2, characterized in that, The composite functional layer includes a first buffer layer and a transparent adhesive layer, the transparent adhesive layer being located between the first buffer layer and the display screen, and the light-transmitting hole passing through both the first buffer layer and the transparent adhesive layer; The transparent adhesive layer includes a first sidewall surrounding the light-transmitting hole, and the main light-blocking part is at least disposed on the first sidewall.

4. The display device according to claim 3, characterized in that, The first buffer layer includes a second sidewall surrounding the light-transmitting hole, and the main light-shielding part is also disposed on the second sidewall.

5. The display device according to claim 4, characterized in that, In the arrangement direction of the first light-transmitting hole and the second light-transmitting hole, the thickness of the main body light-blocking part located on the first sidewall is greater than or equal to the thickness of the main body light-blocking part located on the second sidewall.

6. The display device according to claim 4, characterized in that, The composite functional layer further includes a heat dissipation layer, which is located on the side of the first buffer layer away from the transparent adhesive layer. The heat dissipation layer includes a third sidewall surrounding the light-transmitting hole, and the main body light-shielding part is also disposed on the third sidewall.

7. The display device according to claim 6, characterized in that, In the arrangement direction of the first light-transmitting hole and the second light-transmitting hole, the thickness of the main body light-blocking part located on the second sidewall is greater than or equal to the thickness of the main body light-blocking part located on the third sidewall.

8. The display device according to claim 6, characterized in that, In the thickness direction of the composite functional layer, the side of the main body light-shielding portion near the distance sensor is recessed relative to the side of the heat dissipation layer near the distance sensor.

9. The display device according to claim 3, characterized in that, The material of the first buffer layer includes a light-shielding material.

10. The display device according to claim 2, characterized in that, The main light-shielding part includes a top surface and a bottom surface disposed opposite to each other along the thickness direction of the display device, and a side surface connecting the top surface and the bottom surface; the side surface is in contact with at least the first hole wall, and the top surface is in contact with the display screen.

11. The display device according to claim 10, characterized in that, The display screen includes a back panel and a display panel, the back panel being located between the composite functional layer and the display panel, and the top surface of the light-shielding layer contacting the back panel.

12. The display device according to claim 2, characterized in that, The light-shielding layer further includes at least one extended light-shielding portion, which is connected to the main light-shielding portion and is located on the side of the composite functional layer opposite to the display screen.

13. The display device according to claim 12, characterized in that, In the arrangement direction of the first light-transmitting hole and the second light-transmitting hole, the thickness of the extended light-blocking portion is less than the maximum thickness of the main light-blocking portion.

14. The display device according to claim 13, characterized in that, In the arrangement direction of the first light-transmitting hole and the second light-transmitting hole, the thickness of the main light-shielding part is greater than 0 and less than or equal to 0.3 mm, and the thickness of the extended light-shielding part is less than or equal to 0.2 mm; in the thickness direction of the display device, the height of the extended light-shielding part is less than or equal to 0.1 mm.

15. The display device according to claim 12, characterized in that, The light-shielding layer includes two main light-shielding parts and two extended light-shielding parts. The two main light-shielding parts are located in the first light-transmitting hole and the second light-transmitting hole, respectively, and are respectively connected to the two extended light-shielding parts.

16. The display device according to any one of claims 1 to 15, characterized in that, The material of the light-shielding layer is selected from black adhesive or black ink.

17. The display device according to any one of claims 1 to 15, characterized in that, The composite functional layer includes a first composite functional part located between the first light-transmitting hole and the second light-transmitting hole, a second composite functional part located on the side of the first light-transmitting hole away from the second light-transmitting hole, and a third composite functional part located on the side of the second light-transmitting hole away from the first light-transmitting hole. The display device further includes a housing and a second buffer layer. The housing is located on the side of the composite functional layer opposite to the display screen, and the second buffer layer is located at least between the housing and the first composite functional layer. The material of the second buffer layer is a light-shielding material.

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