A transparent OLED double-sided display panel

Abstract

The present invention discloses a transparent OLED double-sided display panel, which relates to the field of optical display. Among them, the transparent OLED double-sided display panel includes a transparent substrate, a transparent anode layer, an organic light-emitting layer, a transparent cathode layer, and an antireflection layer arranged in sequence. The transparent cathode layer adopts a magnesium-silver composite cathode layer. In the magnesium-silver composite cathode layer, the evaporation rate ratio of magnesium to silver is 1:(9-12). In this application, a magnesium-silver composite cathode layer made of magnesium and silver with a specific ratio is used as the cathode, and an antireflection layer is added. Through the synergistic effect of the magnesium-silver composite cathode layer and the antireflection layer, the visible light transmittance and brightness of the display panel are significantly improved, so that the visible light transmittance can reach more than 70% under the brightness condition that meets the process requirements, and a transparent OLED double-sided display panel with double-sided image clarity and similar colors can be obtained.

Description

Technical Field

[0001] The present application relates to the field of optical displays, and in particular to a transparent OLED dual-sided display panel. Background Art

[0002] Transparent organic light-emitting diode (OLED) display technology has been widely used in fields such as mobile devices and large-size display screens due to its advantages of self-luminescence, high contrast ratio, wide viewing angle, etc. However, in the current related technologies, the visible light transmittance of OLED panels is usually lower than 70%, making it difficult to achieve a good dual-sided display effect. Summary of the Invention

[0003] In order to improve the dual-sided display effect of OLED panels in the related technologies, the present application provides a transparent OLED dual-sided display panel.

[0004] A transparent OLED dual-sided display panel provided by the present application adopts the following technical solution:

[0005] A transparent OLED dual-sided display panel includes a transparent substrate, a transparent anode layer, an organic light-emitting layer, a transparent cathode layer, and an antireflection layer arranged in sequence. The transparent cathode layer adopts a magnesium-silver composite cathode layer. In the magnesium-silver composite cathode layer, the evaporation rate ratio of magnesium to silver is 1:(9 - 12).

[0006] By adopting the above technical solution, using a magnesium-silver composite cathode layer made of magnesium and silver with a specific ratio as the cathode and adding an antireflection layer, the visible light transmittance and brightness of the display panel are significantly improved through the synergistic effect of the magnesium-silver composite cathode layer and the antireflection layer. When the brightness meets the process requirements, the visible light transmittance can reach more than 70%, and a transparent OLED dual-sided display panel with double-sided image clarity and similar colors can be obtained.

[0007] In some specific embodiments, the thickness of the magnesium-silver composite cathode layer is 100 - 140 Å.

[0008] By adopting the above technical solution, controlling the thickness of the magnesium-silver composite cathode layer within 100 - 140 Å can obtain a high visible light transmittance while ensuring the brightness of the display panel, thereby achieving a transparent dual-sided display effect and ensuring the balance between the optical performance and electrical performance of the display panel.

[0009] In some specific embodiments, in the magnesium-silver composite cathode layer, the evaporation rate of magnesium is controlled to be 0.28 - 0.32 Å / s.

[0010] By adopting the above technical solutions, the evaporation rate of magnesium is controlled to be 0.28 - 0.32 A / s, and the evaporation rate of silver is controlled to be 2.80 - 3.84 A / s, which is beneficial to obtaining a magnesium-silver composite cathode layer with high transparency and good uniformity, enabling the magnesium-silver composite cathode layer to have a stable film thickness and good electrical conductivity, thereby improving the display brightness and visible light transmittance of the transparent OLED double-sided display panel.

[0011] In some specific embodiments, the anti-reflection layer adopts a CPL anti-reflection layer, the thickness of the CPL anti-reflection layer is 380 - 420 Å, and the evaporation rate of the CPL anti-reflection layer is controlled to be 0.8 - 1.2 A / s.

[0012] By adopting the above technical solutions, the thickness of the CPL anti-reflection layer is controlled to be 380 - 420 Å and the evaporation rate is controlled within 0.8 - 1.2 A / s, which enables the display panel to further improve the display brightness and uniformity of the double-sided display panel while maintaining good visible light transmittance, achieving a better transparent double-sided display effect.

[0013] In some specific embodiments, the anti-reflection layer includes a CPL anti-reflection layer and a MgF2-ZnS-ZrO2-SiO2 anti-reflection layer. The CPL anti-reflection layer is located between the transparent cathode layer and the MgF2-ZnS-ZrO2-SiO2 anti-reflection layer. The thickness of the CPL anti-reflection layer is 175 - 185 Å, and the thickness of the MgF2-ZnS-ZrO2-SiO2 anti-reflection layer is 95 - 105 Å.

[0014] By adopting the above technical solutions, the CPL anti-reflection layer and the MgF2-ZnS-ZrO2-SiO2 anti-reflection layer cooperate synergistically to significantly reduce the reflection of light and improve the visible light transmittance. Moreover, the thickness of the CPL anti-reflection layer is 175 - 185 Å and the thickness of the MgF2-ZnS-ZrO2-SiO2 anti-reflection layer is 95 - 105 Å. The two cooperate to effectively reduce the thickness of the CPL anti-reflection layer, which is beneficial to reducing costs.

[0015] In some specific embodiments, in the MgF2-ZnS-ZrO2-SiO2 anti-reflection layer, the evaporation rate ratio of MgF2, ZnS, ZrO2 to SiO2 is controlled to be 1:(0.1 - 0.2):(0.05 - 0.1):(0.1 - 0.2).

[0016] By adopting the above technical solutions, the evaporation rate ratio of MgF2, ZnS, ZrO2 to SiO2 is controlled within the range of 1:(0.1 - 0.2):(0.05 - 0.1):(0.1 - 0.2), which is beneficial to maintaining good brightness uniformity and visible light transmittance, and the film layer bonding strength of the double-sided display panel is high.

[0017] In some specific embodiments, the evaporation rate of the CPL antireflection layer is 0.8 - 1.2 Å / s, and in the MgF2-ZnS-ZrO2-SiO2 antireflection layer, the evaporation rate of MgF2 is 2.5 - 3.0 Å / s.

[0018] By adopting the above technical solution, controlling the evaporation rate of the CPL antireflection layer to be 0.8 - 1.2 Å / s and controlling the evaporation rate of MgF2 in the MgF2-ZnS-ZrO2-SiO2 antireflection layer to be 2.5 - 3.0 Å / s can improve the deposition uniformity of the CPL antireflection layer and the MgF2-ZnS-ZrO2-SiO2 antireflection layer, and improve the bonding force between the MgF2-ZnS-ZrO2-SiO2 antireflection layer and the CPL antireflection layer, enhancing the durability of the transparent double-sided display panel.

[0019] In some specific embodiments, the transparent anode layer adopts an indium tin oxide anode layer or a zinc oxide anode layer.

[0020] By adopting the above technical solution, the transparent anode layer adopts an indium tin oxide anode layer or a zinc oxide anode layer, enabling the display panel to have good electrical conductivity and transparency, which helps to improve the display effect.

[0021] In some specific embodiments, the transparent substrate adopts at least one of polyimide, polymethyl methacrylate, and inorganic glass.

[0022] By adopting the above technical solution, the transparent substrate is selected from polyimide, polymethyl methacrylate, or inorganic glass, enabling the display panel to have high transparency while also having excellent mechanical strength and surface flatness.

[0023] In summary, the present application at least includes the following beneficial technical effects:

[0024] (1) The present application uses a magnesium-silver composite cathode layer made of magnesium and silver in a specific ratio as the cathode, and adds an antireflection layer. Through the synergistic effect of the magnesium-silver composite cathode layer and the antireflection layer, the visible light transmittance and brightness of the display panel are significantly improved. When the brightness meets the process requirements, the visible light transmittance can reach more than 70%, and a transparent OLED double-sided display panel with double-sided image clarity and similar colors can be obtained.

[0025] (2) The antireflection layer of this application is preferably a composite film layer of a CPL antireflection layer and a MgF2-ZnS-ZrO2-SiO2 antireflection layer. Through the synergistic effect of the CPL antireflection layer and the MgF2-ZnS-ZrO2-SiO2 antireflection layer, the reflection of light is significantly reduced, the transmittance of visible light is increased, and by controlling the thickness and evaporation rate of the CPL antireflection layer and the MgF2-ZnS-ZrO2-SiO2 antireflection layer, the thickness of the CPL antireflection layer is effectively reduced, which is beneficial to cost reduction, while maintaining good brightness uniformity and visible light transmittance, and the film layer of the double-sided display panel has high bonding strength. Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of the transparent OLED double-sided display panel in Embodiment 1 of this application.

[0027] Figure 2 It is a schematic structural diagram of the transparent OLED double-sided display panel in Embodiments 3-9 of this application.

[0028] Figure 3 It is the front effect of the transparent OLED double-sided display panel in Embodiment 1 of this application.

[0029] Figure 4 It is the reverse effect of the transparent OLED double-sided display panel in Embodiment 1 of this application.

[0030] Description of the Reference Numerals:

[0031] 1. Transparent substrate; 2. Transparent anode layer; 3. Organic light-emitting layer; 4. Transparent cathode layer; 5. CPL antireflection layer; 6. MgF2-ZnS-ZrO2-SiO2 antireflection layer. Detailed Embodiments

[0032] The following further illustrates this application in combination with specific experiments.

[0033] Embodiments

[0034]

Embodiment 1

[0035] A transparent OLED double-sided display panel includes a transparent substrate 1, a transparent anode layer 2, an organic light-emitting layer 3, a transparent cathode layer 4, and an antireflection layer arranged in sequence.

[0036] Among them, the transparent substrate 1 uses a polyimide substrate, and the polyimide film of the brand DJ-PI04 of Dajia New Materials is used.

[0037] The transparent anode layer 2 uses an indium tin oxide anode layer, and the indium tin oxide anode layer is obtained by vacuum evaporation of indium tin oxide.

[0038] The organic light-emitting layer 3 is obtained by evaporating an organic light-emitting material. In this embodiment, it is specifically obtained by evaporating a red-light-emitting organic light-emitting material.

[0039] The transparent cathode layer 4 uses a magnesium-silver composite cathode layer, which is obtained by vacuum evaporation of magnesium and silver. Among them, the thickness of the magnesium-silver composite cathode layer is 100 Å, the evaporation rate of magnesium is 0.3 Å / s, and the evaporation rate of silver is 3 Å / s.

[0040] The anti-reflection layer uses a CPL anti-reflection layer 5, which is obtained by vacuum evaporation of TE6001 from Changzhou Qiangli Yulei Optoelectronic Materials Co., Ltd. Among them, the thickness of the CPL anti-reflection layer is 400 Å, and the evaporation rate of TE6001 is 1 Å / s.

[0041]

Example 2

[0042] A transparent OLED double-sided display panel, different from

Example 1

[0043] In this embodiment, the anti-reflection layer uses a MgF2-ZnS-ZrO2-SiO2 anti-reflection layer 6, which is obtained by jointly vacuum evaporating MgF2, ZnS, ZrO2 and SiO2. Among them, the thickness of the MgF2-ZnS-ZrO2-SiO2 anti-reflection layer 6 is 400 Å, the evaporation rate of MgF2 is 2.8 Å / s, and the evaporation rate ratio of MgF2, ZnS, ZrO2 and SiO2 is 1:0.15:0.075:0.15, that is, the evaporation rate of ZnS is 0.42 Å / s, the evaporation rate of ZrO2 is 0.21 Å / s, and the evaporation rate of SiO2 is 0.42 Å / s.

[0044]

Example 3

[0045] A transparent OLED double-sided display panel, different from

Example 1

[0046] In this embodiment, the antireflection layer includes a CPL antireflection layer 5 and a MgF2-ZnS-ZrO2-SiO2 antireflection layer 6. Among them, the CPL antireflection layer 5 is located between the magnesium-silver composite cathode layer and the MgF2-ZnS-ZrO2-SiO2 antireflection layer. And the CPL antireflection layer 5 is obtained by vacuum evaporation of TE6001 from Changzhou Qiangli Yulei Optoelectronic Materials Co., Ltd. The thickness of the CPL antireflection layer 5 is 200 Å, and the evaporation rate of TE6001 is 1 Å / s; the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6 is obtained by co-vacuum evaporation of MgF2, ZnS, ZrO2 and SiO2. The thickness of the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6 is 200 Å, the evaporation rate of MgF2 is 2.8 Å / s, and the evaporation rate ratio of MgF2, ZnS, ZrO2 and SiO2 is 1:0.15:0.075:0.15, that is, the evaporation rate of ZnS is 0.42 Å / s, the evaporation rate of ZrO2 is 0.21 Å / s, and the evaporation rate of SiO2 is 0.42 Å / s.

[0047]

Example 4

[0048] A transparent OLED double-sided display panel, different from

Example 3

[0049]

Example 5

[0050] A transparent OLED double-sided display panel, different from

Example 3

[0051]

Example 6

[0052] A transparent OLED double-sided display panel, different from

Example 3

[0053]

Example 7

[0054] A transparent OLED double-sided display panel, different from

Example 3

[0055]

Example 8

[0056] A transparent OLED double-sided display panel, which is different from [Embodiment 3] in that: the antireflection layer is different. In this embodiment, the thickness of the CPL antireflection layer 5 is 180 Å, and the thickness of the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6 is 150 Å.

[0057]

Embodiment 9

[0058] A transparent OLED double-sided display panel, which is different from [Embodiment 5] in that: in the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6, the evaporation rate ratios of MgF2, ZnS, ZrO2, and SiO are different, that is, in the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6, the content ratios of the four substances MgF2, ZnS, ZrO2, and SiO are different.

[0059] In this embodiment, the evaporation rate of MgF2 is 2.8 Å / s, and the evaporation rate ratio of MgF2, ZnS, ZrO2, and SiO2 is 1:0.5:0.25:0.5, that is, the evaporation rate of ZnS is 1.4 Å / s, the evaporation rate of ZrO2 is 0.7 Å / s, and the evaporation rate of SiO2 is 1.4 Å / s.

[0060] Comparative example

[0061]

Comparative Example 1

[0062] An OLED display panel, which is different from [Embodiment 1] in that: the contents of magnesium and silver in the magnesium-silver composite cathode layer are different.

[0063] In this comparative example, the thickness of the magnesium-silver composite cathode layer is 100 Å, the evaporation rate of magnesium is 0.3 Å / s, and the evaporation rate of silver is 0.3 Å / s.

[0064]

Comparative Example 2

[0065] An OLED display panel, which is different from [Embodiment 1] in that: the magnesium-silver composite cathode layer is replaced with a silver cathode layer, and the silver cathode layer is obtained by vacuum evaporation of silver, and the evaporation rate of silver is 3 Å / s.

[0066]

Comparative Example 3

[0067] A transparent OLED double-sided display panel, which is different from [Embodiment 1] in that: the antireflection layer is not provided.

[0068] Performance detection test

[0069] (1) Brightness: Refer to the method in 7.3.5 and Appendix B of GB / T 39930-2021 "Performance Requirements for Organic Light-Emitting Diode (OLED) Panels for General Lighting" to test the point brightness of 9 points on the front of the panel, with a voltage of 5V, and record the average value of the point brightness.

[0070] 2. Luminance uniformity: Refer to the method in 7.3.5 and Appendix B of "Performance Requirements for Organic Light-Emitting Diode (OLED) Panels for General Lighting" to measure the point luminance of 9 points on the front of the panel, and then measure the luminance uniformity of the panel according to 7.3.6.

[0071] 3. Visible light transmittance: Illuminate the device with red light and turn it on to record the measured visible light transmittance.

[0072] 4. Cross-cut test: Refer to Section 7 of GB / T 26332.4-2015 for testing. The pulling rate of the tape is 30 mm / s, and record the adhesion grade of the film layer according to the evaluation system in the standard. Among them, the lower the adhesion grade, the higher the bonding strength between the film layers.

[0073] Table 1

[0074]

[0075] The difference between Comparative Example 1 and Example 1 is that in Comparative Example 1, a magnesium-silver composite cathode layer with different magnesium and silver contents is used as the transparent cathode layer 4. Combining the detection data in Table 1, it can be seen that when the evaporation rate ratio of magnesium to silver is not within the range of 1:(9-12), the luminance and visible light transmittance of the OLED double-sided display panel both decrease significantly.

[0076] The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, silver is used alone as the transparent cathode layer 4. Combining the detection data in Table 1, it can be seen that when silver is used alone as the transparent cathode layer, the luminance and visible light transmittance of the OLED double-sided display panel both decrease significantly.

[0077] The difference between Comparative Example 3 and Example 1 is that Comparative Example 3 does not have an antireflection film layer. Combining the detection results in Table 1, it can be seen that the luminance and visible light transmittance in Comparative Example 3 decrease, indicating that the setting of the antireflection film is beneficial to improving the luminous luminance and visible light transmittance of the OLED double-sided display panel.

[0078] Example 2-8 is different from Example 1 in that the composition of the antireflection film is different. Among them, the antireflection film in Example 5 includes a CPL antireflection layer 5 and a MgF2-ZnS-ZrO2-SiO2 antireflection layer 6. The CPL antireflection layer 5 is located between the transparent cathode layer 4 and the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6. The thickness of the CPL antireflection layer 5 is in the range of 175-185 Å, and the thickness of the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6 is in the range of 95-105 Å. Moreover, the evaporation rate of the CPL antireflection layer 5 is in the range of 0.8-1.2 Å / s. In the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6, the evaporation rate ratio of MgF2, ZnS, ZrO2 to SiO2 is 1:(0.1-0.2):(0.05-0.1):(0.1-0.2), and the evaporation rate of MgF2 is in the range of 2.5-3.0 Å / s. Combining the detection data in Table 1, it can be seen that when the antireflection film adopts the combined film layers of the CPL antireflection layer 5 and the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6, and through the coordination of the film layer thickness and the evaporation rate, a transparent OLED double-sided display panel with both high brightness, uniform light emission, high visible light transmittance, high film layer adhesion fastness and good durability can be obtained.

[0079] Example 9 is different from Example 5 in that in the MgF2-ZnS-ZrO2-SiO2 antireflection layer 6, the evaporation rate ratio of MgF2, ZnS, ZrO2, SiO is different, that is, the content ratio of the four substances of MgF2, ZnS, ZrO2, SiO is different. Combining the detection data in Table 1, it can be seen that: the evaporation rate of MgF2 is the same, but when the evaporation rate ratio of MgF2, ZnS, ZrO2 to SiO2 is not in the range of 1:(0.1-0.2):(0.05-0.1):(0.1-0.2), the performance of the OLED double-sided display panel will decline, especially the light emission uniformity, the visible light transmittance and the adhesion fastness between the film layers.

[0080] This specific implementation manner is only an interpretation of the present application, and it does not limit the present application. After reading this specification, those skilled in the art can make modifications that do not contribute creatively to this specific implementation manner according to needs, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A transparent OLED double-sided display panel, characterized in that: It includes a transparent substrate (1), a transparent anode layer (2), an organic light-emitting layer (3), a transparent cathode layer (4), and an antireflection layer arranged in sequence. The transparent cathode layer uses a magnesium-silver composite cathode layer. In the magnesium-silver composite cathode layer, the evaporation rate ratio of magnesium to silver is 1:(9 - 12); The antireflection layer includes a CPL antireflection layer (5) and a MgF2-ZnS-ZrO2-SiO2 antireflection layer (6). The CPL antireflection layer (5) is located between the transparent cathode layer (4) and the MgF2-ZnS-ZrO2-SiO2 antireflection layer (6). The thickness of the CPL antireflection layer (5) is 175 - 185 Å, and the thickness of the MgF2-ZnS-ZrO2-SiO2 antireflection layer (6) is 95 - 105 Å; In the MgF2-ZnS-ZrO2-SiO2 antireflection layer (6), the evaporation rate ratio of MgF2, ZnS, ZrO2 to SiO2 is 1:(0.1 - 0.2):(0.05 - 0.1):(0.1 - 0.2); the evaporation rate of the CPL antireflection layer (5) is 0.8 - 1.2 Å / s. In the MgF2-ZnS-ZrO2-SiO2 antireflection layer (6), the evaporation rate of MgF2 is 2.5 - 3.0 Å / s.

2. The transparent OLED double-sided display panel according to claim 1, wherein: The thickness of the magnesium-silver composite cathode layer is 100 - 140 Å.

3. The transparent OLED double-sided display panel according to claim 2, wherein: In the magnesium-silver composite cathode layer, the evaporation rate of magnesium is controlled to be 0.28 - 0.32 Å / s.

4. A transparent OLED double-sided display panel according to any one of claims 1-3, characterized in that: The transparent anode layer (2) uses an indium tin oxide anode layer or a zinc oxide anode layer.

5. A transparent OLED double-sided display panel according to any one of claims 1-3, characterized in that: The transparent substrate (1) uses at least one of polyimide, polymethyl methacrylate, and inorganic glass.

Images