Optical transparent WLAN antenna integrated in OLED

Abstract

The invention discloses an optical transparent WLAN (wireless local area network) antenna integrated in an OLED (organic light emitting diode), which comprises an OLED chip and an antenna, the OLED chip comprises a metal substrate, a packaging layer, a metal cathode, an electron emission layer, an ITO (indium tin oxide) anode and a glass dielectric layer which are sequentially stacked along the vertical direction, and the antenna comprises an antenna substrate and an ITO grid layer arranged on the antenna substrate. The side, away from the ITO grid layer, of the antenna substrate is attached to the side, away from the ITO anode, of the glass dielectric layer. The antenna is integrated on the OLED chip, and the antenna is arranged in the light emission direction of the OLED chip, so that the attenuation of the light transparency of the OLED layer is reduced to the greatest extent. The antenna adopts an ITO (Indium Tin Oxide) grid structure with good conductivity and optical transparency, so that the wireless transmission performance of the antenna is considered, the optical transparency is increased to the maximum extent, and the application of the antenna in a high-light-transmittance environment is effectively realized.

Description

Technical Field

[0001] The present invention relates to the technical field of antennas, and particularly to an optically transparent WLAN antenna integrated in an OLED. Background Art

[0002] With the gradual development of OLED (organic light-emitting diode) technology, more and more companies are applying OLED technology to the commercialization of lighting and displays. Each company is vigorously investing in this technology to achieve high-quality and low-cost products. Therefore, this technology will surely be applied to the new generation of general lighting in smart cities. In fact, smart cities require new wireless network infrastructure to support a large number of services. In addition, implementing interconnection among buildings, public lighting, transportation services, vehicles, and mobile devices requires a larger communication area. To achieve reliable communication, a corresponding number of antennas should be integrated into each product. However, due to the limited antenna reserved space in these products and the resulting visual pollution, it becomes difficult to integrate the desired number of antennas into each product. In this case, optically transparent antennas can be properly applied. Optically transparent antennas can be placed in OLED devices such as lighting lamps and display screens to improve network coverage and reduce their visual and spatial impacts.

[0003] In existing smart cities, product antennas mostly adopt product forms such as PCB and FPC. Due to the physical characteristics of their materials and the requirements of antennas for space, they cannot be applied in an environment with a high light transmittance. Summary of the Invention

[0004] In view of the above deficiencies of the prior art, the purpose of the present invention is to provide an optically transparent WLAN antenna integrated in an OLED.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] An optically transparent WLAN antenna integrated in an OLED, comprising an OLED chip and an antenna. The OLED chip includes a metal substrate, a packaging layer, a metal cathode, an electron emission layer, an ITO anode, and a glass dielectric layer stacked in sequence along the vertical direction. The antenna includes an antenna substrate and an ITO grid layer disposed on the antenna substrate. The side of the antenna substrate away from the ITO grid layer is attached to the side of the glass dielectric layer away from the ITO anode.

[0007] Optionally, the ITO grid layer includes an antenna radiation unit, a connection part, a transmission line, and a grounding unit arranged in sequence from left to right along the horizontal direction. The antenna radiation unit is connected to the transmission line through the connection part. The connection part is a radian structure, and there is a gap between the transmission line and the grounding unit.

[0008] Optionally, the radian structure is a curve.

[0009] Optionally, the arc structure is a wavy line.

[0010] Optionally, the arc structure is an oblique line.

[0011] Optionally, the grounding unit is a groove structure, the transmission line is arranged in the groove of the groove structure, and there is a gap between the transmission line and the inner wall of the groove.

[0012] Optionally, the groove structure is in a "concave" shape.

[0013] Optionally, with the left - right direction as the length and the direction perpendicular to the left - right direction as the width, the length and width dimensions of the OLED chip are 56mm×40mm, and the length and width dimensions of the antenna are 44mm×28mm.

[0014] Optionally, the thickness of the metal cathode is 120nm, the thickness of the electron emission layer is 270nm, the thickness of the ITO anode is 150nm, the sheet resistance of the ITO anode is 11.2Ω / sq, the thickness of the glass dielectric layer is 0.8mm, and the dielectric constant of the glass dielectric layer is 3.78.

[0015] The beneficial effects of the present invention are as follows:

[0016] The antenna is integrated on the OLED chip, and the antenna is arranged in the light - emitting direction of the OLED chip to minimize the attenuation of the light transparency of the OLED layer. The antenna adopts an ITO grid structure with good electrical conductivity and optical transparency, maximizing the light transparency while taking into account the wireless transmission performance of the antenna, and effectively realizing the application of the antenna in a high - light - transmittance environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The following shows a schematic structural diagram of the optically transparent WLAN antenna integrated in the OLED according to an embodiment of the present invention;

[0018] Figure 2 The following shows a planar structure diagram of the antenna in the optically transparent WLAN antenna integrated in the OLED according to an embodiment of the present invention;

[0019] Figure 3 The following shows a comparison diagram of the S - parameter simulation results of the optically transparent WLAN antenna integrated in the OLED according to Embodiment 1 of the present invention and the comparative example;

[0020] Figure 4 The following shows a comparison diagram of the efficiency simulation results of the optically transparent WLAN antenna integrated in the OLED according to Embodiment 1 of the present invention and the comparative example.

[0021] Reference numeral description:

[0022] 1. Metal substrate; 2. Encapsulation layer; 3. Metal cathode; 4. Electron emission layer; 5. ITO anode; 6. Glass dielectric layer; 7. Antenna substrate; 8. ITO grid layer; 81. Antenna radiation unit; 82. Connection part; 83. Transmission line; 84. Grounding unit. Detailed implementation mode

[0023] In order to more clearly understand the technical content, achieved objectives and effects of the present invention, the present invention will be described in detail below in combination with specific implementation modes and with reference to the accompanying drawings. It should be noted that, without conflict, the implementation modes of the present invention and the features in the implementation modes can be combined with each other. Many specific details are set forth in the following description in order to fully understand the present invention. The described implementation modes are only a part of the implementation modes of the present invention, rather than all the implementation modes. Based on the implementation modes in the present invention, all other implementation modes obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0024] Please refer to Figure 1-2 As shown, the technical solution provided by the present invention is:

[0025] An optically transparent WLAN antenna integrated in an OLED, comprising an OLED chip and an antenna. The OLED chip includes a metal substrate 1, an encapsulation layer 2, a metal cathode 3, an electron emission layer 4, an ITO anode 5, and a glass dielectric layer 6 stacked in sequence along the vertical direction. The antenna includes an antenna substrate 7 and an ITO grid layer 8 provided on the antenna substrate 7. The side of the antenna substrate 7 away from the ITO grid layer 8 is attached to the side of the glass dielectric layer 6 away from the ITO anode 5.

[0026] From the above description, it can be seen that the beneficial effects of the present invention are as follows: The antenna is integrated on the OLED chip, and the antenna is provided in the light emission direction of the OLED chip to minimize the attenuation of the light transparency of the OLED layer. The antenna adopts an ITO grid structure with good electrical conductivity and optical transparency, maximizing the light transparency while taking into account the wireless transmission performance of the antenna, and effectively realizing the application of the antenna in a high light transmittance environment.

[0027] Optionally, the ITO grid layer 8 includes an antenna radiation unit 81, a connection part 82, a transmission line 83, and a grounding unit 84 arranged in sequence from left to right along the horizontal direction. The antenna radiation unit 81 is connected to the transmission line 83 through the connection part 82. The connection part 82 is a radian structure, and there is a gap between the transmission line 83 and the grounding unit 84.

[0028] From the above description, it can be seen that a radian structure is used for transition between the transmission line and the antenna radiation unit, which can better perform impedance matching to obtain a larger bandwidth.

[0029] Optionally, the arc structure is a curve.

[0030] Optionally, the arc structure is a wavy line.

[0031] Optionally, the arc structure is an oblique line.

[0032] As can be seen from the above description, the arc structure can adopt forms such as curves, wavy lines, and oblique lines. The present invention preferably adopts the curve form, which can provide a smoother electromagnetic distribution and impedance gradient, effectively avoiding and reducing the tip effect and reflection loss.

[0033] Optionally, the grounding unit 84 is a groove structure, the transmission line 83 is arranged in the groove of the groove structure, and there is a gap between the transmission line 83 and the inner wall of the groove.

[0034] As can be seen from the above description, the grounding unit adopts a groove (SLOT) structure, which can ensure the impedance matching of the antenna feed while obtaining better reflection ground results with the smallest usage area.

[0035] Optionally, the groove structure is in the shape of a "concave".

[0036] Optionally, with the left - right direction as the length and the direction perpendicular to the left - right direction as the width, the length and width dimensions of the OLED chip are 56 mm × 40 mm, and the length and width dimensions of the antenna are 44 mm × 28 mm.

[0037] Optionally, the thickness of the metal cathode 3 is 120 nm, the thickness of the electron emission layer 4 is 270 nm, the thickness of the ITO anode 5 is 150 nm, the sheet resistance of the ITO anode 5 is 11.2 Ω / sq, the thickness of the glass dielectric layer 6 is 0.8 mm, and the dielectric constant of the glass dielectric layer 6 is 3.78.

[0038] As can be seen from the above description, the present invention preferably adopts the above - mentioned parameter design to achieve a better optically transparent WLAN antenna product integrated in the OLED.

[0039] Please refer to Figure 1-4 , Example 1 of the present invention is:

[0040] An optically transparent WLAN antenna integrated in an OLED, comprising an OLED chip and an antenna. The OLED chip includes a metal substrate 1, a packaging layer 2, a metal cathode 3, an electron emission layer 4, an ITO anode 5, and a glass dielectric layer 6 stacked in sequence along the vertical direction. The antenna includes an antenna substrate 7 and an ITO grid layer 8 arranged on the antenna substrate 7. The side of the antenna substrate 7 away from the ITO grid layer 8 is attached to the side of the glass dielectric layer 6 away from the ITO anode 5. As Figure 1 shown. The arrow indicates the light - emitting direction of the OLED chip.

[0041] The ITO grid layer 8 includes an antenna radiation unit 81, a connection part 82, a transmission line 83, and a grounding unit 84 arranged in sequence from left to right in the horizontal direction. The antenna radiation unit 81 is connected to the transmission line 83 through the connection part 82. The connection part 82 is an arc structure in the form of a curve. The grounding unit 84 is a groove structure in the shape of a "concave", and the transmission line 83 is arranged in the groove of the groove structure, and there is a gap between the transmission line 83 and the inner wall of the groove. An antenna excitation point is formed between the transmission line 83 and the bottom of the groove. As Figure 2 shown.

[0042] Taking the left - right direction as the length and the direction perpendicular to the left - right direction as the width, the length and width dimensions of the OLED chip are 56mm×40mm, and the length and width dimensions of the antenna are 44mm×28mm. The material of the metal cathode 3 is aluminum, the thickness of the metal cathode 3 is 120nm, the thickness of the electron emission layer 4 is 270nm, the thickness of the ITO anode 5 is 150nm, the sheet resistance of the ITO anode 5 is 11.2Ω / sq, the thickness of the glass dielectric layer 6 is 0.8mm, and the dielectric constant of the glass dielectric layer 6 is 3.78.

[0043] An antenna with the same structure and the ITO grid layer replaced by a patch layer is used as a comparative example. As Figure 3 shown is a comparison chart of the S - parameter simulation results between the optically transparent WLAN antenna integrated in the OLED in this embodiment and the comparative example. In the figure, Patch Antenna refers to the antenna of the comparative example, and Mesh Antenna refers to the antenna of this embodiment. It can be seen from the figure that there are slight differences between the two curves, but it meets the requirement of return loss below - 10dB, and when using the grid antenna, the low - frequency has a wider bandwidth.

[0044] As Figure 4 shown is a comparison chart of the efficiency simulation results between the optically transparent WLAN antenna integrated in the OLED in this embodiment and the comparative example. In the figure, Patch Antenna refers to the antenna of the comparative example, and Mesh Antenna refers to the antenna of this embodiment. It can be seen from the figure that the efficiencies of the two antennas are close and both are higher than 30%.

[0045] It can be seen that the optically transparent WLAN antenna integrated in the OLED in this embodiment not only achieves good light transmittance but also ensures good performance such as bandwidth and efficiency. It realizes full coverage of 2.4 - 2.5GHz, 5.15 - 5.825GHz, and 6 - 7.125GHz of WLAN.

[0046] In summary, the optically transparent WLAN antenna integrated in the OLED in this embodiment can be used in products such as OLED screens, realizing the application of the antenna in a high - light - transmittance environment.

[0047] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention. Therefore, any modifications, equivalent changes and decorations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An optically transparent WLAN antenna integrated in an OLED, characterized in that: It comprises an OLED chip and an antenna. The OLED chip comprises a metal substrate, a packaging layer, a metal cathode, an electron emission layer, an ITO anode and a glass dielectric layer stacked in sequence along a vertical direction. The antenna comprises an antenna substrate and an ITO grid layer arranged on the antenna substrate. The side of the antenna substrate away from the ITO grid layer is attached to the side of the glass dielectric layer away from the ITO anode.

2. The optically transparent WLAN antenna integrated in an OLED according to claim 1, characterized in that The ITO grid layer includes an antenna radiation unit, a connection part, a transmission line and a grounding unit arranged in sequence from left to right along the horizontal direction. The antenna radiation unit is connected to the transmission line through the connection part, and the connection part is an arc structure. There is a gap between the transmission line and the grounding unit.

3. The optically transparent WLAN antenna integrated in an OLED according to claim 2, characterized in that The arc structure is a curve.

4. The optically transparent WLAN antenna integrated in an OLED according to claim 2, characterized in that: The arc structure is a wavy line.

5. The optically transparent WLAN antenna integrated in an OLED according to claim 2, characterized in that: The arc structure is a slant line.

6. The optically transparent WLAN antenna integrated in an OLED according to claim 2, characterized in that: The grounding unit is a slot-shaped structure, the transmission line is arranged in the slot of the slot-shaped structure, and there is a gap between the transmission line and the inner wall of the slot.

7. The optically transparent WLAN antenna integrated in an OLED according to claim 6, characterized in that: The groove structure is in a "concave" shape.

8. The optically transparent WLAN antenna integrated in an OLED according to claim 2, characterized in that: Taking the left-right direction as the length and the width perpendicular to the left-right direction as the width, the length and width of the OLED chip are 56 mm×40 mm, and the length and width of the antenna are 44 mm×28 mm.

9. The optically transparent WLAN antenna integrated in an OLED according to claim 1, characterized in that: The thickness of the metal cathode is 120 nm, the thickness of the electron emission layer is 270 nm, the thickness of the ITO anode is 150 nm, the square resistance of the ITO anode is 11.2 Ω / sq, the thickness of the glass dielectric layer is 0.8 mm, and the dielectric constant of the glass dielectric layer is 3.78.

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