OLED display devices

Abstract

This application provides an OLED display device. The OLED display device includes an anode, a cathode, and multiple OLED modules; wherein the anode and cathode are arranged opposite to each other, and the multiple OLED modules are arranged in series between the anode and cathode; furthermore, at least one of the multiple OLED modules consists of multiple OLED display units arranged in parallel. The OLED display device of this application has high luminous brightness and a long lifespan, therefore, it has a wide range of applications, suitable not only for small-sized display products such as mobile phones, but also for medium-sized display products such as laptops and tablets, and can enhance the market competitiveness of OLED display products.

Description

Technical Field

[0001] This application relates to the field of displays, and more particularly to an OLED display device. Background Technology

[0002] OLED (Organic Light-Emitting Diode) display devices have many advantages, such as self-illumination, low driving voltage, high luminous efficiency, short response time, wide operating temperature range, and the ability to achieve flexible displays. They are widely recognized in the industry as the display devices with the greatest development potential.

[0003] However, existing OLED devices have a short lifespan, which limits the application scope of OLED display technology and reduces the market competitiveness of OLED display products. Summary of the Invention

[0004] This application provides an OLED display device with high luminous brightness and long lifespan. Therefore, this OLED display device has a wide range of applications, not only suitable for small-sized display products such as mobile phones, but also suitable for medium-sized display products such as laptops and tablets, and can enhance the market competitiveness of OLED display products.

[0005] This application provides an OLED display device, including:

[0006] anode;

[0007] The cathode is disposed opposite to the anode;

[0008] Multiple OLED modules are arranged in series between the anode and the cathode, and at least one of the multiple OLED modules consists of multiple OLED display units arranged in parallel.

[0009] In some embodiments, in the plurality of OLED display units arranged in parallel, the power-on or power-off status of each OLED display unit is controlled by an independent switch.

[0010] In some embodiments, at least one of the plurality of OLED modules is composed of an OLED display unit.

[0011] In some embodiments, the OLED display unit includes a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer that are sequentially stacked in a direction from the anode to the cathode.

[0012] In some embodiments, a charge connection layer is provided between any adjacent OLED modules in the plurality of OLED modules.

[0013] In some embodiments, the charge-connecting layer includes an N-type doped material layer and a P-type doped material layer stacked together.

[0014] In some embodiments, the N-type doped material layer includes an N-type dopant and a first host material, wherein the first host material is an organic material;

[0015] The P-type doped material layer includes a P-type dopant and a second host material, wherein the second host material is an organic material.

[0016] In some embodiments, the first host material is the same as the material of the electron transport layer, or the first host material is the same as the material of the electron injection layer;

[0017] The second main material is the same as the material of the hole transport layer, or the second main material is the same as the material of the hole injection layer.

[0018] In some embodiments, the P-type dopant includes at least one of TCNQ, WO3, ReO3, and MoO3, and the N-type dopant includes at least one of Li, Cs, Yb, Cs2CO3, Li2CO3, and Li3N.

[0019] In some embodiments, the plurality of OLED modules include a first OLED module, a second OLED module, and a third OLED module arranged sequentially in a direction from the anode to the cathode;

[0020] Both the first OLED module and the third OLED module consist of a single OLED display unit.

[0021] The second OLED module consists of multiple OLED display units arranged in parallel;

[0022] A first charge connection layer is provided between the first OLED module and the second OLED module, and a second charge connection layer is provided between the second OLED module and the third OLED module.

[0023] In some embodiments, the plurality of OLED modules include a fourth OLED module and a fifth OLED module arranged sequentially in a direction from the anode to the cathode, wherein the fourth OLED module is composed of an OLED display unit and the fifth OLED module is composed of a plurality of OLED display units arranged in parallel;

[0024] A third charge connection layer is provided between the fourth OLED module and the fifth OLED module.

[0025] In some embodiments, the plurality of OLED modules include a sixth OLED module, a seventh OLED module, and an eighth OLED module arranged sequentially in a direction from the anode to the cathode;

[0026] Both the sixth OLED module and the eighth OLED module are composed of multiple OLED display units arranged in parallel.

[0027] The seventh OLED module consists of an OLED display unit;

[0028] A fourth charge connection layer is provided between the sixth OLED module and the seventh OLED module, and a fifth charge connection layer is provided between the seventh OLED module and the eighth OLED module.

[0029] The OLED display device provided in this application embodiment connects multiple OLED modules in series, and at least one OLED module is composed of multiple OLED display units connected in parallel. That is, the OLED display device has multiple OLED display units connected in series and parallel between the cathode and anode. In this case, the OLED display device can generate a large luminous brightness with a small driving current. In other words, under the same driving current, the luminous brightness of the OLED display device in this application embodiment is greater than that of a traditional OLED display device. Therefore, when the luminous brightness of the OLED display device in this application embodiment is controlled to be the same as that of a traditional OLED display device, based on the same aging mechanism, the OLED display device in this application embodiment can achieve a longer lifespan than a traditional OLED display device. Due to its high luminous brightness and long lifespan, the OLED display device in this application embodiment has a wide range of applications, not only suitable for small-sized display products such as mobile phones, but also for medium-sized display products such as laptops and tablets, and can enhance the market competitiveness of OLED display products. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is a schematic diagram of a first structure of an OLED display device provided in an embodiment of this application.

[0032] Figure 2 This is a schematic diagram of the structure of an OLED display unit provided in an embodiment of this application.

[0033] Figure 3 This is a schematic diagram of the structure of the second OLED module provided in an embodiment of this application.

[0034] Figure 4 This is a schematic diagram of a second structure of the OLED display device provided in an embodiment of this application.

[0035] Figure 5 This is a schematic diagram of a third structure of the OLED display device provided in the embodiments of this application. Detailed Implementation

[0036] 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 scope of protection of this application.

[0037] Please see Figure 1 , Figure 1 This is a schematic diagram of a first structure of an OLED display device provided in an embodiment of this application. An embodiment of this application provides an OLED display device 100, including an anode 10, a cathode 20, and multiple OLED modules. The anode 10 and cathode 20 are disposed opposite to each other, and the multiple OLED modules are arranged in series between the anode 10 and cathode 20. Furthermore, at least one of the multiple OLED modules consists of multiple OLED display units 41 arranged in parallel.

[0038] It should be noted that in the embodiments of this application, "multiple" refers to two or more, such as three, four, five, six, seven, eight, nine, ten, etc.

[0039] It should be noted that the OLED display device 100 provided in this application embodiment is configured by connecting multiple OLED modules in series, and at least one OLED module is composed of multiple OLED display units 41 connected in parallel. That is to say, the OLED display device 100 has multiple OLED display units 41 connected in series and parallel between the cathode 20 and the anode 10. In this case, the OLED display device 100 can produce a large luminous brightness under a small driving current. In other words, under the same driving current, the luminous brightness of the OLED display device 100 in this application embodiment is greater than that of a traditional OLED display. The luminous brightness of the device 100 is such that, when the luminous brightness of the OLED display device 100 in this embodiment is controlled to be the same as that of the conventional OLED display device 100, based on the same aging mechanism, the OLED display device 100 in this embodiment can achieve a longer service life than the conventional OLED display device 100. Due to its higher luminous brightness and longer service life, the OLED display device 100 in this embodiment has a wider range of applications, not only suitable for small-sized display products such as mobile phones, but also suitable for medium-sized display products such as laptops and tablets, and can enhance the market competitiveness of OLED display products.

[0040] It is understood that in the OLED display device 100 provided in this application embodiment, among the multiple OLED modules connected in series, when the luminous efficiency of one OLED module decreases or is damaged, the other OLED modules can still be used normally, thereby ensuring the normal operation of the OLED display device 100 for a long time and extending the service life of the OLED display device 100; when the OLED module is composed of multiple OLED display units 41 arranged in parallel, if the luminous efficiency of one OLED display unit 41 in the OLED module decreases or is damaged, the OLED display device 100 can be kept working normally by controlling the light emission of the other OLED display units 41 in the OLED module, thereby extending the service life of the OLED display device 100.

[0041] For example, among the multiple OLED modules, at least one OLED module is composed of an OLED display unit 41.

[0042] For example, in a plurality of OLED modules, a charge connection layer is provided between any adjacent OLED modules. It is understood that the charge connection layer serves to connect the various OLED modules. In addition, when current is applied, holes and electrons can be generated in the charge connection layer and injected into the light-emitting layer 413 of the OLED modules located on both sides of the charge connection layer, respectively. They combine with electrons from the cathode direction 20 and holes from the anode direction 10 in the light-emitting layer 413 to generate exciton luminescence.

[0043] It is understood that the charge-connect layer needs to have light transmission properties so that the emitted light from each OLED module can pass through the charge-connect layer and reach the light-emitting surface of the OLED display device 100. For example, the transmittance of the charge-connect layer for light in the 380nm-780nm range is greater than or equal to 10%, such as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 100%.

[0044] For example, the charge connection layer includes stacked N-type doped material layers and P-type doped material layers. It should be noted that the working principle of the charge connection layer is as follows: the stacked N-type and P-type doped material layers form a PN junction, and an electron channel is formed inside the PN junction. When an external electric field is applied, because the internal electric field of the PN junction is weaker than the applied electric field, the dipoles in the PN junction are separated into holes and electrons. The holes and electrons tunnel through the electron channel and are injected into the OLED modules located on both sides of the PN junction, respectively. They combine with electrons from the cathode direction 20 and holes from the anode direction 10 in the light-emitting layer 413 of the OLED module to generate exciton emission.

[0045] In some embodiments, the N-type doped material layer and the P-type doped material layer are arranged sequentially in the direction from the cathode 20 to the anode 10.

[0046] For example, the N-type doped material layer includes an N-type dopant and a first host material, wherein the first host material is an organic material or an inorganic material.

[0047] For example, the P-type doped material layer includes a P-type dopant and a second host material, wherein the second host material is an organic material or an inorganic material.

[0048] In some embodiments, the first host material is the same as the material of the electron transport layer 414, or the first host material is the same as the material of the electron injection layer 415; the second host material is the same as the material of the hole transport layer 412, or the second host material is the same as the material of the hole injection layer 411.

[0049] For example, the P-type dopant includes at least one of TCNQ (7,7,8,8-tetracyanoquinone dimethane), WO3 (tungsten trioxide), ReO3 (rhenium trioxide), and MoO3 (molybdenum trioxide).

[0050] For example, the N-type dopant includes at least one of Li (lithium), Cs (cesium), Yb (ytterbium), Cs2CO3 (cesium carbonate), Li2CO3 (lithium carbonate), and Li3N (lithium nitride).

[0051] For example, when an OLED module consists of multiple OLED display units 41 arranged in parallel, the power-on status of each OLED display unit 41 is controlled by an independent switch. It is understood that during the use of the OLED display device 100, the number of OLED display units 41 emitting light can be controlled by controlling the switches of the multiple OLED display units 41, thereby controlling the brightness of the OLED display device 100. Furthermore, when the luminous efficiency of one of the multiple OLED display units 41 arranged in parallel decreases or is damaged, the brightness reduction of the OLED display device 100 can be compensated by controlling the other OLED display units 41 in the parallel circuit to emit light. Alternatively, two adjacent OLED display units 41 in the same parallel circuit can be arranged to emit light alternately, ultimately extending the lifespan of each OLED display unit 41 and thus extending the lifespan of the entire OLED display device 100.

[0052] It is understandable that when there is current between the anode 10 and cathode 20 of the OLED display device 100, and when the switch is in the open state, the OLED display unit 41 is in the powered state, and at this time, the OLED display unit 41 can emit light under the action of the current; when there is current between the anode 10 and cathode 20 of the OLED display device 100, but the switch is in the closed state, the OLED display unit 41 is in the unpowered state, and the OLED display unit 41 cannot achieve the light emission effect.

[0053] For example, the switch can be a thin film transistor (TFT). It is understood that a thin film transistor typically includes a source, a drain, and a gate. When a positive voltage greater than its turn-on voltage is applied to the gate, the thin film transistor is in the on state, and the source and drain are connected. When the voltage applied to the gate is less than the turn-on voltage, the thin film transistor is in the off state, and the source and drain are not connected. That is to say, the gate voltage can be used to control the switching of the thin film transistor, thereby controlling whether the OLED display unit 41 is powered on or off.

[0054] For example, when the switch is a thin-film transistor, one of the source and drain of the thin-film transistor can be connected to the OLED display unit 41 controlled by the thin-film transistor, and the other of the source and drain can be connected to the adjacent charge connection layer, cathode 20 or anode 10.

[0055] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of an OLED display unit provided in an embodiment of this application. The OLED display unit 41 may include a hole injection layer 411, a hole transport layer 412, a light-emitting layer 413, an electron transport layer 414, and an electron injection layer 415, which are sequentially stacked in the direction from the anode 10 to the cathode 20.

[0056] Please see Figure 1 Multiple OLED modules may include a first OLED module 31, a second OLED module 32, and a third OLED module 33 arranged sequentially in the direction from the anode 10 to the cathode 20.

[0057] Please combine Figure 1 and Figure 2 Both the first OLED module 31 and the third OLED module 33 are composed of an OLED display unit 41.

[0058] Please see Figure 3 At the same time, combined Figure 2 , Figure 3 This is a schematic diagram of the structure of the second OLED module provided in the embodiment of this application. The second OLED module 32 is composed of a plurality of OLED display units 41 arranged in parallel. The power supply of each OLED display unit 41 is controlled by an independent switch 60.

[0059] Please combine Figure 1 A first charge connection layer 51 is provided between the first OLED module 31 and the second OLED module 32, and a second charge connection layer 52 is provided between the second OLED module 32 and the third OLED module 33. The first charge connection layer 51 and the second charge connection layer 52 can each be the charge connection layer in any of the above embodiments. For example, the first charge connection layer 51 and the second charge connection layer 52 can both include an N-type doped material layer and a P-type doped material layer stacked together.

[0060] Please combine Figure 1 and Figure 3 The switch 60 in the second OLED module 32 can be located between the OLED display unit 41 controlled by the thin film transistor and the first charge connection layer 51, or it can be located between the OLED display unit 41 controlled by the thin film transistor and the second charge connection layer 52.

[0061] For example, when the switch 60 in the second OLED module 32 is a thin-film transistor, one of the source and drain of the thin-film transistor can be connected to the OLED display unit 41 controlled by the thin-film transistor, and the other of the source and drain can be connected to the first charge connection layer 51 or the second charge connection layer 52.

[0062] Please see Figure 4 , Figure 4 This is a second structural schematic diagram of the OLED display device provided in an embodiment of this application. Multiple OLED modules include a fourth OLED module 34 and a fifth OLED module 35 arranged sequentially from the anode 10 to the cathode 20. The fourth OLED module 34 consists of one OLED display unit 41, and the fifth OLED module 35 consists of multiple OLED display units 41 arranged in parallel. Please refer to... Figure 2 The structure of the OLED display unit 41 is as follows Figure 2 As shown; please refer to Figure 3 The fifth OLED module 35 and the second OLED module 32 have the same structure, both consisting of multiple OLED display units 41 arranged in parallel. The power supply of each OLED display unit 41 is controlled by an independent switch 60. In other embodiments, the fourth OLED module 34 may consist of multiple OLED display units 41 arranged in parallel, and the fifth OLED module 35 may consist of a single OLED display unit 41.

[0063] Please combine Figure 4 A third charge connection layer 53 is provided between the fourth OLED module 34 and the fifth OLED module 35. The third charge connection layer 53 can be the charge connection layer in any of the above embodiments. For example, the third charge connection layer 53 includes an N-type doped material layer and a P-type doped material layer stacked together.

[0064] Please combine Figure 3 and Figure 4 The switch 60 in the fifth OLED module 35 can be located between the OLED display unit 41 controlled by the thin film transistor and the cathode 20, or between the OLED display unit 41 controlled by the thin film transistor and the third charge connection layer 53.

[0065] For example, when the switch 60 in the fifth OLED module 35 is a thin-film transistor, one of the source and drain of the thin-film transistor can be connected to the OLED display unit 41 controlled by the thin-film transistor, and the other of the source and drain can be connected to the cathode 20 or the third charge connection layer 53.

[0066] Please see Figure 5 , Figure 5 This is a third structural schematic diagram of the OLED display device provided in the embodiments of this application. Multiple OLED modules include a sixth OLED module 36, a seventh OLED module 37, and an eighth OLED module 38 arranged sequentially from the anode 10 to the cathode 20; the sixth OLED module 36 and the eighth OLED module 38 are each composed of multiple OLED display units 41 arranged in parallel, while the seventh OLED module 37 is composed of one OLED display unit 41. Please refer to... Figure 2 The structure of the OLED display unit 41 is as follows Figure 2 As shown; please refer to Figure 3 The sixth OLED module 36 and the eighth OLED module 38 have the same structure as the second OLED module 32. They are all composed of multiple OLED display units 41 arranged in parallel. The power supply of each OLED display unit 41 is controlled by an independent switch 60.

[0067] Please combine Figure 5 A fourth charge connection layer 54 is provided between the sixth OLED module 36 and the seventh OLED module 37, and a fifth charge connection layer 55 is provided between the seventh OLED module 37 and the eighth OLED module 38. The fourth charge connection layer 54 and the fifth charge connection layer 55 can each be the charge connection layer in any of the above embodiments. For example, the fourth charge connection layer 54 and the fifth charge connection layer 55 can both include an N-type doped material layer and a P-type doped material layer stacked together.

[0068] Please combine Figure 3 and Figure 5 The switch 60 in the sixth OLED module 36 can be disposed between the OLED display unit 41 controlled by the thin-film transistor and the anode 10, or it can be disposed between the OLED display unit 41 controlled by the thin-film transistor and the fourth charge connection layer 54. For example, when the switch 60 in the sixth OLED module 36 is a thin-film transistor, one of the source and drain of the thin-film transistor can be connected to the OLED display unit 41 controlled by the thin-film transistor, and the other of the source and drain can be connected to the anode 10 or the fourth charge connection layer 54.

[0069] Please combine Figure 3 and Figure 4The switch 60 in the eighth OLED module 38 can be disposed between the OLED display unit 41 controlled by the thin-film transistor and the cathode 20, or it can be disposed between the OLED display unit 41 controlled by the thin-film transistor and the fifth charge connection layer 55. For example, when the switch 60 in the eighth OLED module 38 is a thin-film transistor, one of the source and drain of the thin-film transistor can be connected to the OLED display unit 41 controlled by the thin-film transistor, and the other of the source and drain can be connected to the cathode 20 or the fifth charge connection layer 55.

[0070] For example, the anode 10 can be a transmission electrode, and the transmittance of the anode 10 for light in the 380nm-780nm range is greater than or equal to 10%, such as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 100%. For example, the material of the anode 10 can include a transparent conductive metal oxide, such as indium tin oxide (ITO).

[0071] For example, the cathode 20 can be a reflective electrode, and the cathode 20 has a reflectivity of 10% or more for light in the 380nm-780nm range, such as 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, or 100%. For example, the material of the cathode 20 includes a metal, such as silver (Ag).

[0072] In some other embodiments, the anode 10 can be a reflective electrode and the cathode 20 can be a transmission electrode.

[0073] It should be noted that the OLED display device 100 provided in this application embodiment can emit light under extremely small driving current, and the luminous efficiency can increase exponentially with the number of OLED display units 41 connected in series and parallel, enabling the OLED display device 100 to achieve higher luminous efficiency and brightness, and extending the service life of the OLED display device 100. Since the decrease in luminous efficiency or damage of one of the multiple OLED display units 41 connected in series and parallel will not affect the luminous stability of the entire OLED display device 100, the OLED display device 100 provided in this application embodiment has good working stability. In addition, since the OLED display device 100 has low power consumption, when the OLED display device 100 is applied to electronic devices (such as mobile phones, laptops, tablets, etc.), the battery capacity in the electronic device can be kept small, thereby reducing the thickness of the battery and making the body of the electronic device thinner and lighter, thus achieving the goal of making the electronic device thinner and lighter. Furthermore, since the OLED display device 100 has high brightness, the OLED display device 100 is also suitable for the lighting field and can be used in lighting equipment.

[0074] The OLED display device provided in the embodiments of this application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An OLED display device, characterized by, The application relates to an OLED display device, which comprises: an anode; a cathode, which is arranged opposite to the anode; a plurality of OLED modules, which are arranged in series between the anode and the cathode, and at least one of the OLED modules is composed of a plurality of OLED display units arranged in parallel; at least one of the OLED modules is composed of one OLED display unit; the OLED modules comprise a first OLED module, a second OLED module and a third OLED module arranged in sequence in the direction from the anode to the cathode; the first OLED module and the third OLED module are each composed of one OLED display unit; the second OLED module is composed of a plurality of OLED display units arranged in parallel; a first charge connection layer is arranged between the first OLED module and the second OLED module, and a second charge connection layer is arranged between the second OLED module and the third OLED module.

2. The OLED display device of claim 1, wherein, The power supply of each OLED display unit is controlled by an independent switch.

3. The OLED display device of claim 1, wherein, The OLED display unit comprises a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer and an electron injection layer arranged in sequence in the direction from the anode to the cathode. 4.The OLED display device of claim 3, wherein, A charge connection layer is arranged between any adjacent OLED modules. 5.The OLED display device of claim 4, wherein, The charge connection layer comprises an N-type doped material layer and a P-type doped material layer arranged in sequence. 6.The OLED display device of claim 5, wherein, The N-type doped material layer comprises an N-type dopant and a first host material, and the first host material is an organic material; The P-type doped material layer comprises a P-type dopant and a second host material, and the second host material is an organic material. 7.The OLED display device of claim 6, wherein, The first host material is the same as the material of the electron transport layer, or the first host material is the same as the material of the electron injection layer; The second host material is the same as the material of the hole transport layer, or the second host material is the same as the material of the hole injection layer. 8.The OLED display device of claim 6, wherein, The P-type dopant comprises at least one of TCNQ, WO3, ReO3 and MoO3, and the N-type dopant comprises at least one of Li, Cs, Yb, Cs2CO3, Li2CO3 and Li3N.

9. The OLED display device according to any one of claims 1-8, wherein, The OLED modules comprise a fourth OLED module and a fifth OLED module arranged in sequence in the direction from the anode to the cathode, the fourth OLED module is composed of one OLED display unit, and the fifth OLED module is composed of a plurality of OLED display units arranged in parallel; a third charge connection layer is arranged between the fourth OLED module and the fifth OLED module. 10.The OLED display device of any one of claims 1-8, wherein, The OLED modules comprise a sixth OLED module, a seventh OLED module and an eighth OLED module arranged in sequence in the direction from the anode to the cathode; the sixth OLED module and the eighth OLED module are each composed of a plurality of OLED display units arranged in parallel; The seventh OLED module is composed of one OLED display unit; A fourth charge connecting layer is arranged between the sixth OLED module and the seventh OLED module, and a fifth charge connecting layer is arranged between the seventh OLED module and the eighth OLED module.

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