Silicon-based OLED structure and preparation method thereof

Abstract

The invention belongs to the technical field of micro display, particularly relates to a silicon-based OLED (Organic Light Emitting Diode) structure and a preparation method, and aims to solve the problems that the thicknesses of organic materials with three colors are different, more serious optical crosstalk exists on the contact surfaces of two materials than the thicknesses of RGB (Red, Green and Blue) are the same, and color cast exists in a display at a large angle. Three mounting grooves are formed in the top of the substrate body, light-emitting materials are arranged in the three mounting grooves, the top of the substrate body is fixedly connected with a packaging layer, the packaging layer is located above the light-emitting materials, and three trapezoidal grooves are formed in the top of the packaging layer. According to the silicon-based OLED structure and the preparation method disclosed by the invention, light can be gathered to the middle, the amount of emergent light penetrating through the contact surface of two color filter materials is reduced, crosstalk between different colors is reduced, the light emitting rate of a display device is improved, and the protection of the device can be improved by arranging a glass cover plate.

Description

Technical Field

[0001] The present invention relates to the field of micro-display technology, and in particular to a silicon-based OLED structure and a preparation method thereof. Background Art

[0002] Silicon-based OLEDs are particularly suitable for near-eye display devices, VR headsets, and AR glasses due to their high pixel density, high refresh rate, and low power consumption. In the VR field, silicon-based OLEDs are expected to achieve more immersive and realistic interactive display effects in high-end headset products1. In the AR field, silicon-based OLEDs with Birdbath design have become the mainstream solution for consumer-grade AR glasses. With the growth of shipments of consumer-grade AR products, the demand for silicon-based OLEDs is expected to continue to grow.

[0003] The existing OLED structure color filter is generally composed of three colors of organic materials, RGB, which are formed into pixels with a certain arrangement pattern and different colors after coating, exposure and development. In addition, due to the different thicknesses of the three colors of organic materials, there will be more serious optical crosstalk at the contact surface of the two materials than when the RGB thickness is the same, resulting in color deviation of the display at large angles. Summary of the invention

[0004] The present invention discloses a silicon-based OLED structure and a preparation method, aiming to solve the technical problem in the background technology that the thickness of organic materials of three colors are different, which will cause more serious optical crosstalk at the contact surface of two materials than when the thickness of RGB is the same, resulting in color deviation of the display at a large angle.

[0005] A silicon-based OLED structure proposed in the present invention includes a substrate body, wherein three mounting grooves are formed on the top of the substrate body, and light-emitting materials are arranged inside the three mounting grooves, an encapsulation layer is fixedly connected to the top of the substrate body, the encapsulation layer is located above the light-emitting material, and three trapezoidal grooves are formed on the top of the encapsulation layer, microlens structures are arranged inside the three trapezoidal grooves, a same flat layer is arranged above the three microlens structures, a red coating layer, a green coating layer and a blue coating layer are arranged on the top of the flat layer, the red coating layer is located on one side of the green coating layer, the blue coating layer is located on the other side of the green coating layer, and a same glass cover plate is arranged on the top of the red coating layer, the green coating layer and the blue coating layer.

[0006] By providing a flat layer, the device surface can be made flat, which is convenient for color filter gluing and can effectively isolate possible short circuits between the upper and lower layers; by providing a red coating, a green coating and a blue coating, red, green and blue light of different intensities can be combined and adjusted to produce rich and diverse colors, allowing the screen to present colorful images and videos; by providing a glass cover, its function is to protect the display device and prevent external mechanical damage.

[0007] In a preferred solution, the substrate body is provided with a display driving circuit and a pixel opening. The display driving circuit can adjust the brightness and color of the pixel by controlling the current size and the on-off state of each pixel, and the pixel opening can determine the luminous area, so that the light can be emitted according to the designed area to ensure the clarity and accuracy of the image; the luminescent material is a small molecule organic material and a polymer organic material dropped on the top of the substrate body by an evaporation process, and this luminescent material provides a white light source; the encapsulation layer is composed of multiple inorganic layers, and the inorganic layers have high hardness and stability; the microlens structure material is a high refractive index material, which can change the light path and optimize the propagation direction of the light; the flat layer is made of a low refractive index material to make the device surface flat, facilitate the coating of the color filter, and effectively isolate the short circuit that may occur between the upper and lower layers; the red coating, the green coating and the blue coating are all made of filter materials, and when white light passes through different filter materials, it will emit light of different colors, and by combining and adjusting red, green and blue lights of different intensities, rich and diverse colors are produced, so that the screen can present colorful images and videos.

[0008] By providing a substrate body, a stable support and fixing foundation can be provided for other basic components, ensuring that the relative positions of the various layers of the structure remain stable during the manufacturing and use processes, so that the screen can work normally; by providing a luminescent material, the device can provide a stable white light source; by providing an encapsulation layer, it can effectively prevent external oxygen and water vapor from entering the interior of the device while maintaining the internal chemical and physical environment stable, ensuring that the organic light-emitting material can work in a relatively stable environment, thereby ensuring that the OLED device can continuously and stably emit light and extend the service life of the device; by providing a microlens structure, the light path can be changed to increase the light emission efficiency and improve the brightness of the screen.

[0009] In a preferred solution, a plurality of injection holes are provided on the top of the glass cover plate, and the size of the injection holes is 0.5 mm-1 mm. A connecting frame and a cross fixing piece are provided on the bottom of the glass cover plate, and two cross slots are provided on the top of the connecting frame. A sealing rubber ring is provided on the outer wall of the glass cover plate, and the sealing rubber ring is made of silicone rubber.

[0010] The glass cover can protect the device below from external mechanical damage; the sealing rubber ring can play a sealing role to prevent dust, moisture, etc. from entering, and increase friction to fix the glass cover more firmly.

[0011] A method for preparing a silicon-based OLED structure, comprising the silicon-based OLED structure as described above, comprising the following steps:

[0012] Step 1: evaporating white light emitting material on the provided substrate body with display driving circuit and pixel opening;

[0013] Step 2: depositing an inorganic film encapsulation layer on the white light material by chemical vapor deposition and atomic layer deposition;

[0014] Step 3: Print a single droplet of high-refractive material into the pixel hole by inkjet printing on the encapsulation layer, and form a microlens structure because the ink droplet will not flow flat;

[0015] Step 4: Coat a layer of low-refractive organic material on the microlens as a flat layer to facilitate the subsequent coating of color filter materials;

[0016] Step 5: coating, exposing and developing the red coating, green coating and blue coating color filter materials respectively to form a pixelated color filter;

[0017] Step 6: Place a glass cover on top of the color filter material to protect the devices underneath.

[0018] From the above, it can be seen that the silicon-based OLED structure provided by the present invention can gather light to the middle, reduce the amount of light passing through the contact surface of two color filter materials, reduce the crosstalk between different colors, and at the same time improve the light output rate of the display device. By setting a glass cover, the protection of the device can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a silicon-based OLED structure proposed by the present invention;

[0020] Figure 2 This is a schematic diagram of a glass cover plate and a connecting frame structure of a silicon-based OLED structure proposed by the present invention;

[0021] Figure 3 This is a schematic diagram of a cross fixing piece and a pouring hole structure of a silicon-based OLED structure proposed by the present invention.

[0022] In the figure: 1. substrate body; 2. luminescent material; 3. packaging layer; 4. microlens structure; 5. flat layer; 6. red coating layer; 7. green coating layer; 8. blue coating layer; 9. glass cover plate; 10. sealing rubber ring; 11. injection hole; 12. connecting frame; 13. cross fixing piece; 14. cross slot. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0024] A silicon-based OLED structure disclosed in the present invention is mainly used in scenarios where the thickness of organic materials of three colors are different, which will cause more serious optical crosstalk at the contact surface of the two materials than when the thickness of RGB is the same, resulting in color deviation of the display at a large angle.

[0025] Reference Figure 1-Figure 3 A silicon-based OLED structure comprises a substrate body 1, three mounting grooves are formed on the top of the substrate body 1, and light-emitting materials 2 are arranged inside the three mounting grooves, an encapsulation layer 3 is fixedly connected to the top of the substrate body 1, the encapsulation layer 3 is located above the light-emitting material 2, and three trapezoidal grooves are formed on the top of the encapsulation layer 3, microlens structures 4 are arranged inside the three trapezoidal grooves, a same flat layer 5 is arranged above the three microlens structures 4, a red coating layer 6, a green coating layer 7 and a blue coating layer 8 are arranged on the top of the flat layer 5, the red coating layer 6 is located on one side of the green coating layer 7, the blue coating layer 8 is located on the other side of the green coating layer 7, and a same glass cover plate 9 is arranged on the top of the red coating layer 6, the green coating layer 7 and the blue coating layer 8.

[0026] Specifically, the flat layer 5 can make the device surface flat, which is convenient for color filter gluing and can effectively isolate possible short circuits between the upper and lower layers; the red coating 6, the green coating 7 and the blue coating 8 combine and adjust red, green and blue light of different intensities to produce rich and diverse colors, allowing the screen to present colorful images and videos; the glass cover 9 protects the display device from external mechanical damage.

[0027] Reference Figure 1-Figure 3 In a preferred embodiment, the substrate body 1 has a display driving circuit and a pixel opening. The display driving circuit can adjust the brightness and color of the pixel by controlling the current size and on-off state of each pixel, and the pixel opening can determine the luminous area, so that the light can be emitted according to the designed area to ensure the clarity and accuracy of the image; the luminescent material 2 uses a vapor deposition process to drop small molecule organic materials and polymer organic materials on the top of the substrate body 1, and this luminescent material 2 provides a white light source; the encapsulation layer 3 is composed of multiple inorganic layers, and the inorganic layers have high hardness and Stability; the material of the microlens structure 4 is a high-refractive material, which can change the light path and optimize the propagation direction of the light; the material of the flat layer 5 is a low-refractive material, in order to make the device surface flat, it is convenient for the color filter to be coated and it can effectively isolate the short circuit that may occur between the upper and lower layers; the red coating 6, the green coating 7 and the blue coating 8 are all made of filter materials. When white light passes through different filter materials, it will emit light of different colors, and by combining and adjusting red, green and blue light of different intensities, rich and diverse colors are produced, allowing the screen to present colorful images and videos.

[0028] Specifically, the substrate body 1 with the driving circuit transmits current to the light-emitting material 2, and the light-emitting material 2 emits white light. A single ink droplet of the high-refractive material is printed into the pixel hole by inkjet printing on the encapsulation layer 3. Since the ink droplet does not flow flat, a microlens structure 4 is formed. The emitted white light changes the propagation path of the light through the microlens structure 4, so that the light is gathered in the middle.

[0029] In specific application scenarios, the substrate body 1 can provide a stable support and fixing foundation for other basic components, ensuring that the relative positions of each layer of the structure remain stable during the manufacturing and use process, so that the screen can work normally; the luminescent material 2 can provide a stable white light source for the device; the encapsulation layer 3 can effectively prevent external oxygen and water vapor from entering the device while maintaining the internal chemical and physical environment stable, ensuring that the organic luminescent material 2 can work in a relatively stable environment, thereby ensuring that the OLED device can continuously and stably emit light and extend the service life of the device; the microlens structure 4 can change the light path to increase the light emission efficiency and improve the brightness of the screen.

[0030] Reference Figure 1-Figure 3 In a preferred embodiment, a plurality of pouring holes 11 are provided on the top of the glass cover plate 9, and the size of the pouring holes 11 is 0.5 mm-1 mm. A connecting frame 12 and a cross fixing member 13 are provided on the bottom of the glass cover plate 9, and two cross card grooves 14 are provided on the top of the connecting frame 12; a sealing rubber ring 10 is provided on the outer wall of the glass cover plate 9, and the sealing rubber ring 10 is made of silicone rubber.

[0031] Specifically, the glass cover plate 9 is clamped into the top of the connecting frame 12 through the cross fixing piece 13, and the glass cover plate 9 is connected to the color filter material below through the injection hole 11;

[0032] In a specific application scenario, the glass cover plate 9 can protect the devices below from external mechanical damage; the sealing rubber ring 10 can play a sealing role to prevent dust, moisture, etc. from entering, and can also increase friction to fix the glass cover plate 9 more firmly.

[0033] A method for preparing a silicon-based OLED structure, comprising the silicon-based OLED structure as described above, comprising the following steps:

[0034] Step 1: evaporating a white light emitting material 2 on a substrate body 1 provided with a display driving circuit and a pixel opening;

[0035] Step 2: depositing an inorganic film encapsulation layer 3 on the white light material 2 by chemical vapor deposition and atomic layer deposition;

[0036] Step 3: Print a single ink droplet of a high-refractive material into the pixel hole on the encapsulation layer 3 by inkjet printing, and since the ink droplet will not flow flat, a microlens structure 4 is formed;

[0037] Step 4: coating a layer of low-refractive organic material on the microlens as a flat layer 5 to facilitate subsequent coating of color filter material;

[0038] Step 5: coating, exposing and developing the color filter materials of the red coating layer 6, the green coating layer 7 and the blue coating layer 8 respectively to form a pixelated color filter;

[0039] Step 6: Paste the glass cover plate 9 on the color filter material, and inject glue into the injection hole 11, so that the glass cover plate 9 fits tightly with the OLED screen, reducing bubbles and gaps, enhancing firmness while ensuring the display effect, so as to protect the devices underneath.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A silicon-based OLED structure, comprising a substrate body (1), characterized in that: The top of the substrate body (1) is provided with three mounting grooves, and the insides of the three mounting grooves are all provided with luminescent materials (2); the top of the substrate body (1) is fixedly connected with an encapsulation layer (3), the encapsulation layer (3) is located above the luminescent materials (2), and the top of the encapsulation layer (3) is provided with three trapezoidal grooves, the insides of the three trapezoidal grooves are all provided with microlens structures (4), and the same flat layer (5) is provided above the three microlens structures (4); the top of the flat layer (5) is provided with a red coating layer (6), a green coating layer (7) and a blue coating layer (8), the red coating layer (6) is located on one side of the green coating layer (7), the blue coating layer (8) is located on the other side of the green coating layer (7), and the tops of the red coating layer (6), the green coating layer (7) and the blue coating layer (8) are provided with a same glass cover plate (9).

2. A silicon-based OLED structure according to claim 1, characterized in that: The substrate body (1) is provided with a display driving circuit and a pixel opening. The display driving circuit can adjust the brightness and color of each pixel by controlling the current size and the on-off state of each pixel. The pixel opening can determine the luminous area so that the light can be emitted according to the designed area, thereby ensuring the clarity and accuracy of the image.

3. A silicon-based OLED structure according to claim 2, characterized in that: The luminescent material (2) is formed by depositing small molecule organic material and polymer organic material onto the top of the substrate body (1) through an evaporation process, and the luminescent material (2) provides a white light source.

4. A silicon-based OLED structure according to claim 3, characterized in that: The encapsulation layer (3) is composed of multiple inorganic layers, and the inorganic layers have high hardness and stability.

5. The silicon-based OLED structure according to claim 4, characterized in that: The material of the microlens structure (4) is a high-refractive material, which can change the light path and optimize the propagation direction of the light.

6. The silicon-based OLED structure according to claim 5, characterized in that: The flat layer (5) is made of a low-refractive material to make the device surface flat, facilitate the gluing of the color filter, and effectively isolate possible short circuits between the upper and lower layers.

7. The silicon-based OLED structure according to claim 6, characterized in that: The red coating (6), the green coating (7) and the blue coating (8) are all made of filter materials. When white light passes through different filter materials, light of different colors will be emitted. By combining and adjusting red, green and blue lights of different intensities, rich and diverse colors are generated, allowing the screen to present colorful images and videos.

8. The silicon-based OLED structure according to claim 7, characterized in that: The top of the glass cover plate (9) is provided with a plurality of injection holes (11), the size of the injection holes (11) being 0.5 mm to 1 mm, the bottom of the glass cover plate (9) is provided with a connecting frame (12) and a cross fixing piece (13), and the top of the connecting frame (12) is provided with two cross slots (14).

9. The silicon-based OLED structure according to claim 8, characterized in that: The outer wall of the glass cover plate (9) is provided with a sealing rubber ring (10), and the sealing rubber ring (10) is made of silicone rubber.

10. A method for preparing a silicon-based OLED structure, comprising the silicon-based OLED structure according to claim 9, characterized in that: The steps include: Step 1: evaporating a white light emitting material (2) on a provided substrate body (1) having a display driving circuit and a pixel opening; Step 2: depositing an inorganic film encapsulation layer (3) on the white light material (2) by chemical vapor deposition and atomic layer deposition; Step 3: Printing a single ink droplet of a high-refractive material into a pixel hole on the encapsulation layer (3) by inkjet printing, and forming a microlens structure (4) because the ink droplet does not flow flat; Step 4: coating a layer of low-refractive organic material on the microlens as a flat layer (5) to facilitate subsequent coating of color filter material; Step 5: coating, exposing and developing the color filter materials of the red coating (6), the green coating (7) and the blue coating (8) respectively to form a pixelated color filter; Step 6: Paste a glass cover plate (9) on top of the color filter material to protect the components underneath.

Images