AMOLED display structure for under-screen fingerprint identification

Abstract

The utility model discloses an AMOLED (Active Matrix / Organic Light Emitting Diode) display structure for fingerprint identification under a screen, which belongs to the technical field of AMOLED and comprises a substrate, and the top of the substrate is sequentially provided with an anode layer, a hole function layer, a light-emitting function layer, an electronic function layer, a cathode layer and a light extraction layer. According to the OLED device, the anode layer, the hole function layer, the light-emitting function layer, the electronic function layer, the cathode layer and the light extraction layer are used in cooperation, and when voltage is applied to the OLED device, electrons and holes are injected into the electron transmission layer and the hole transmission layer from the cathode layer and the anode layer respectively; electrons and holes are compounded in the light-emitting layer to form singlet or triplet excitons, the excitons are emitted in the form of photons after radiation decay, and the buffer layer and the anti-oxidation layer are arranged between the light extraction layer and the cathode layer, so that the structure in the device can be effectively buffered and protected, and the oxidation speed of the structure can be effectively slowed down; and the service life and the stability of the structure are effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of AMOLED, in particular to an AMOLED display structure for in-screen fingerprint recognition. Background Technique

[0002] Active Matrix Organic Light Emitting Diode (AMOLED) is considered to be the most potential display device because of its advantages of self-luminescence, ultra-thin and light, fast response speed, wide viewing angle, low power consumption, etc.

[0003] Chinese Patent with publication number CN209056496U discloses an AMOLED display structure for in-screen fingerprint recognition, including a glass layer, a transparent conductive layer, a first insulating layer, a semiconductor layer and a second insulating layer in the capacitance region structure. The transparent conductive layer, the first insulating layer, the semiconductor layer and the second insulating layer are sequentially arranged on the surface of the glass layer. The capacitance region structure in the AMOLED display structure is set as a transparent structure, and the two plates of the capacitance structure are composed of the transparent conductive layer and the semiconductor layer, so as to form an avoidance area required for in-screen fingerprint recognition, improve the integration of new functions, and realize the design of optical in-screen fingerprint recognition.

[0004] There are still some obvious deficiencies in the above-mentioned AMOLED display structure for in-screen fingerprint recognition during actual use. The AMOLED display structure does not have a buffer and protection structure, which is extremely easy to cause damage to the AMOLED display structure under high-frequency use conditions. Moreover, its packaging structure has the problem of easy oxidation of the internal structure, resulting in a greatly reduced service life of the AMOLED and a high failure rate. Therefore, we need to propose an AMOLED display structure for in-screen fingerprint recognition. Content of the Utility Model

[0005] The purpose of the utility model is to provide an AMOLED display structure for in-screen fingerprint recognition, which has the advantages of being able to buffer and protect the AMOLED display structure and antioxidant protection, so as to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the utility model provides an AMOLED display structure for in-screen fingerprint recognition, including a substrate. An anode layer, a hole functional layer, a light-emitting functional layer, an electron functional layer, a cathode layer and a light extraction layer are sequentially arranged on the top of the substrate. The anode layer, the hole functional layer, the light-emitting functional layer, the electron functional layer, the cathode layer and the light extraction layer are sequentially bonded to the top of the substrate. A buffer layer with a buffer protection function is arranged between the light extraction layer and the cathode layer, and an antioxidant layer with an antioxidant function is also arranged between the buffer layer and the cathode layer.

[0007] Preferably, the hole functional layer includes a hole injection layer adhered to the top of the anode layer, and a hole transport layer is adhered to the side of the hole injection layer away from the anode layer.

[0008] Preferably, the electron functional layer includes a carrier injection layer adhered to the bottom of the cathode layer, and an electron transport layer is adhered to the side of the carrier injection layer away from the cathode layer.

[0009] Preferably, the light-emitting functional layer includes a light-emitting layer disposed between the electron transport layer and the hole transport layer, a hole blocking layer is disposed between the light-emitting layer and the electron transport layer, and an electron blocking layer is disposed between the light-emitting layer and the hole transport layer.

[0010] Preferably, the light extraction layer includes a high-refractive-index encapsulation layer adhered to the top of the cathode layer, and a low-refractive-index encapsulation layer is adhered to the side of the high-refractive-index encapsulation layer away from the cathode layer.

[0011] Preferably, both the buffer layer and the anti-oxidation layer are disposed between the high-refractive-index encapsulation layer and the cathode layer, the top of the buffer layer is adhered to the bottom of the high-refractive-index encapsulation layer, and the bottom of the anti-oxidation layer is adhered to the top of the cathode layer.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] By the combined use of the anode layer, the hole functional layer, the light-emitting functional layer, the electron functional layer, the cathode layer and the light extraction layer in the present utility model, when a voltage is applied to the OLED device, electrons and holes are respectively injected from the cathode layer and the anode layer into the electron transport layer and the hole transport layer. The electrons and holes recombine in the light-emitting layer to form singlet or triplet excitons, and the excitons decay radiatively to emit light in the form of photons. Moreover, a buffer layer and an anti-oxidation layer are disposed between the light extraction layer and the cathode layer, which can effectively buffer and protect the structures in the device and slow down the oxidation rate of the structures, effectively improving the service life and stability of the structure. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the AMOLED display structure for in-screen fingerprint recognition of the present utility model.

[0015] In the figure: 1. Substrate; 2. Anode layer; 3. Hole functional layer; 31. Hole injection layer; 32. Hole transport layer; 4. Light-emitting functional layer; 41. Light-emitting layer; 42. Hole blocking layer; 43. Electron blocking layer; 5. Electron functional layer; 51. Carrier injection layer; 52. Electron transport layer; 6. Cathode layer; 7. Light extraction layer; 71. High-refractive-index encapsulation layer; 72. Low-refractive-index encapsulation layer; 8. Buffer layer; 9. Anti-oxidation layer. Detailed Embodiments

[0016] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0017] Please refer to Figure 1 , the present utility model provides an AMOLED display structure for in-screen fingerprint recognition, including a substrate 1, on the top of the substrate 1, an anode layer 2, a hole functional layer 3, a light-emitting functional layer 4, an electron functional layer 5, a cathode layer 6 and a light extraction layer 7 are sequentially arranged, and the anode layer 2, the hole functional layer 3, the light-emitting functional layer 4, the electron functional layer 5, the cathode layer 6 and the light extraction layer 7 are sequentially bonded to the top of the substrate 1.

[0018] In this embodiment, through the combined use of the anode layer 2, the hole functional layer 3, the light-emitting functional layer 4, the electron functional layer 5, the cathode layer 6 and the light extraction layer 7, when a voltage is applied to the OLED device, electrons and holes are respectively injected from the cathode layer 6 and the anode layer 2 into the electron transport layer 52 and the hole transport layer 32, and the electrons and holes recombine in the light-emitting layer 41 to form singlet or triplet excitons, and the excitons undergo radiative decay and emit in the form of photons.

[0019] Furthermore, the hole functional layer 3 includes a hole injection layer 31 bonded to the top of the anode layer 2, and a hole transport layer 32 is bonded to the side of the hole injection layer 31 away from the anode layer 2. When a voltage is applied to the OLED device, the holes generated by the anode layer 2 will be injected into the hole injection layer 31 and transported to the light-emitting layer 41 through the hole transport layer 32.

[0020] Still further, the electron functional layer 5 includes a carrier injection layer 51 bonded to the bottom of the cathode layer 6, and an electron transport layer 52 is bonded to the side of the carrier injection layer 51 away from the cathode layer 6. When a voltage is applied to the OLED device, the electrons generated by the cathode layer 6 will be input into the light-emitting layer 41 through the carrier injection layer 51 and the electron transport layer 52.

[0021] Furthermore, the light-emitting functional layer 4 includes a light-emitting layer 41 disposed between the electron transport layer 52 and the hole transport layer 32. A hole blocking layer 42 is provided between the light-emitting layer 41 and the electron transport layer 52, and an electron blocking layer 43 is provided between the light-emitting layer 41 and the hole transport layer 32. Electrons and holes recombine in the light-emitting layer 41 to form singlet or triplet excitons, and the excitons undergo radiative decay to emit photons in the form of light. By using the electron blocking layer 43 and the hole blocking layer 42 in combination, the moving electrons and holes can be restricted, preventing electrons from entering the side where holes move and also preventing holes from entering the side where electrons move. By restricting them, electrons and holes can enter the light-emitting layer 41, causing electrons and holes to recombine in the light-emitting layer 41 to form singlet or triplet excitons, and the excitons undergo radiative decay to emit photons in the form of light.

[0022] Preferably, the light extraction layer 7 includes a high-refractive-index encapsulation layer 71 adhered to the top of the cathode layer 6, and a low-refractive-index encapsulation layer 72 is adhered to the side of the high-refractive-index encapsulation layer 71 away from the cathode layer 6. In this embodiment, the light extraction layer 7 includes the high-refractive-index encapsulation layer 71 and the low-refractive-index encapsulation layer 72. The high-refractive-index encapsulation layer 71 mainly uses a silver coating, and its refractive index can reach 1.5 - 1.7 in the visible light range. Metals such as gold, copper, and aluminum can also be used as the coating of the high-refractive-index encapsulation layer 71. Additionally, the low-refractive-index encapsulation layer 72 uses optical glass, which is a transparent inorganic material. The refractive index of the low-refractive-index encapsulation layer 72 is 1.3 - 1.5, and some types have relatively high refractive indices. For example, the refractive indices of materials such as germanium glass, silicon-germanium glass, and lithium glass are all above 1.6. In this embodiment, the low-refractive-index encapsulation layer 72 uses one of germanium glass, silicon-germanium glass, and lithium glass.

[0023] It should be noted that a buffer layer 8 with a buffer protection function is provided between the light extraction layer 7 and the cathode layer 6, and an anti-oxidation layer 9 with an anti-oxidation function is further provided between the buffer layer 8 and the cathode layer 6. Both the buffer layer 8 and the anti-oxidation layer 9 are disposed between the high-refractive-index encapsulation layer 71 and the cathode layer 6, and the top of the buffer layer 8 is adhered to the bottom of the high-refractive-index encapsulation layer 71, and the bottom of the anti-oxidation layer 9 is adhered to the top of the cathode layer 6.

[0024] In this embodiment, the buffer layer 8 is specifically a hyperelastic polymer film, and the hyperelastic polymer film is a substrate-free film material mainly composed of polysiloxane. When the material is subjected to an external force, the strain lags behind the stress, and changes such as bond length and bond angle occur during the deformation process. There are also torsions and slips between molecular chain segments. When the external force disappears, the elastic deformation parts such as bond length and bond angle can return to their original positions. The viscous deformation parts such as the slip of molecular chain segments cannot be completely restored, and this part of the energy is finally dissipated in the form of heat, thereby dissipating the impact energy and achieving the buffering effect. By providing the buffer layer 8, the AMOLED display structure can be buffered and protected, so as to improve its service life and stability.

[0025] In addition, in this embodiment, the anti-oxidation layer 9 is specifically an anti-oxidation coating, and its main materials are boric acid, phosphoric acid, etc. These anti-oxidation coatings can decompose at high temperatures to form a dense oxide film, preventing oxygen from entering the interior of the AMOLED display structure, and can improve the anti-oxidation performance of the AMOLED display structure.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An AMOLED display structure for under-screen fingerprint recognition, comprising a substrate (1), characterized in that: An anode layer (2), a hole functional layer (3), a light emitting functional layer (4), an electronic functional layer (5), a cathode layer (6) and a light extraction layer (7) are sequentially arranged on the top of the substrate (1); the anode layer (2), the hole functional layer (3), the light emitting functional layer (4), the electronic functional layer (5), the cathode layer (6) and the light extraction layer (7) are sequentially bonded to the top of the substrate (1); a buffer layer (8) having a buffering protection function is arranged between the light extraction layer (7) and the cathode layer (6); and an anti-oxidation layer (9) having an anti-oxidation function is also arranged between the buffer layer (8) and the cathode layer (6).

2. The AMOLED display structure for under-screen fingerprint recognition according to claim 1, characterized in that: The hole functional layer (3) comprises a hole injection layer (31) bonded to the top of the anode layer (2), and a hole transport layer (32) is bonded to the side of the hole injection layer (31) away from the anode layer (2).

3. The AMOLED display structure for under-screen fingerprint recognition according to claim 2, characterized in that: The electronic functional layer (5) comprises a carrier injection layer (51) bonded to the bottom of the cathode layer (6), and an electron transport layer (52) is bonded to the side of the carrier injection layer (51) away from the cathode layer (6).

4. The AMOLED display structure for under-screen fingerprint recognition according to claim 3, characterized in that: The light-emitting functional layer (4) comprises a light-emitting layer (41) arranged between an electron transport layer (52) and a hole transport layer (32), a hole blocking layer (42) being arranged between the light-emitting layer (41) and the electron transport layer (52), and an electron blocking layer (43) being arranged between the light-emitting layer (41) and the hole transport layer (32).

5. The AMOLED display structure for under-screen fingerprint recognition according to claim 1, characterized in that: The light extraction layer (7) comprises a high-refractive encapsulation layer (71) bonded to the top of the cathode layer (6), and a low-refractive encapsulation layer (72) is bonded to the side of the high-refractive encapsulation layer (71) away from the cathode layer (6).

6. The AMOLED display structure for under-screen fingerprint recognition according to claim 5, characterized in that: The buffer layer (8) and the anti-oxidation layer (9) are both arranged between the high-refractive encapsulation layer (71) and the cathode layer (6), and the top of the buffer layer (8) is bonded to the bottom of the high-refractive encapsulation layer (71), and the bottom of the anti-oxidation layer (9) is bonded to the top of the cathode layer (6).

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