Micro OLED display module and manufacturing method thereof

Abstract

The invention relates to the technical field of display screens, in particular to a Micro OLED display module which comprises an X-cube prism. The X-cube prism is respectively connected with a red micro display screen module, a green micro display screen module and a blue micro display screen module; a red micro display screen module, a green micro display screen module and a blue micro display screen module are sequentially glued on three side surfaces of the X-cube prism; the red, green and blue single-color micro display screens are adopted to combine colors through the X-cube prism to realize full color, so that the loss of current mainstream full-color light is reduced, and the brightness of the whole assembly is improved; compared with a current mainstream full-color red, green and blue side-by-side distribution scheme, the device adopts a single-color screen to realize single-point full-color through X-cube prism color combination, and the resolution of the screen with the same size is improved by three times.

Description

Technical Field

[0001] The present invention relates to the technical field of display screens. Specifically, the present invention relates to a Micro OLED display module and a manufacturing method thereof. Background Art

[0002] For AR+AI (Augmented Reality + Artificial Intelligence) smart glasses, the wearer uses them every day, and the usage scenarios involve indoors and outdoors; therefore, AR+AI smart glasses need to meet the characteristics of being beautiful, light in weight, low in power consumption, small in size, and bright in the light entering the eyes; at the same time, the AR+AI smart glasses solution involves diffractive optical waveguides and geometric optical waveguides, and there will be more light loss during the process of light transmitting from the screen through the optical waveguide to the eyes; to ensure the brightness requirement of the light entering the eyes, the brightness of the display screen needs to be bright enough; the current mainstream micro display screens on AR+AI smart glasses are Micro LED (Micro Light Emitting Diode) and Micro OLED (Micro Organic Light Emitting Diode) screens, but due to the immature process maturity of Micro LED, the cost is very high, which is not conducive to the popularization and application of AR+AI (Augmented Reality + Artificial Intelligence) smart glasses; Micro OLED is currently mainstream, but because the full-color solution is white OLED + color film, the light brightness out of the screen is relatively low.

[0003] The applicant found through retrieval that the Chinese patent document with the application number 202222654884.5 was published on July 18, 2023, and discloses an OLED micro display screen color gamut brightness adjustment component and an OLED micro display screen, including an OLED driving layer, a pure blue light OLED image layer, and a perovskite quantum dot light conversion layer. The OLED driving layer is used to control the generation and brightness of pure blue light; the pure blue light OLED driving layer is arranged at one end of the OLED image layer; the perovskite quantum dot light conversion layer is arranged at the end of the pure blue light OLED image layer far from the driving layer; this device also cannot solve the above technical problems.

[0004] Therefore, in order to improve or solve at least one of the above problems, it is necessary to provide a Micro OLED display module that can enhance the light brightness out of the screen of Micro OLED. Summary of the Invention

[0005] The purpose of the present invention is to provide a Micro OLED display module that can enhance the light brightness out of the screen of Micro OLED.

[0006] To solve the above technical problems, the technical solution adopted by the present invention is: a Micro OLED display module, including an X-cube prism; a red micro display screen module, a green micro display screen module, and a blue micro display screen module are respectively connected to the X-cube prism.

[0007] The X-cube prism is provided with a light-emitting surface; a red light-incident surface is provided on one side of the light-emitting surface, and a blue light-incident surface is provided on the other side of the light-emitting surface; a green light-incident surface is provided on the side of the X-cube prism away from the light-emitting surface; the red micro-display module is glued on the red light-incident surface; the green micro-display module is glued on the green light-incident surface; and the blue micro-display module is glued on the blue light-incident surface.

[0008] The red micro-display module, the green micro-display module, and the blue micro-display module all include a substrate; an upper cover plate is provided on the substrate; an OLED control unit is provided between the substrate and the upper cover plate; and the OLED control unit is connected with an FPC.

[0009] The red light-incident surface, the blue light-incident surface, and the green light-incident surface all include a prism blank area and a prism blackened area; the prism blackened area is arranged along the edge of the prism blank area; a display area and a border blackened area are provided on the upper cover plate; the border blackened area is arranged along the display area; and the border blackened area is connected with the prism blackened area through UV glue.

[0010] The OLED control unit includes a driving circuit IC, an anode, and a PDL; the driving circuit IC is provided on the substrate; the anode is provided between the driving circuit IC and the PDL; the anode is connected with the driving circuit IC; an OLED device display unit is provided on the PDL; and the driving circuit IC is connected with the FPC.

[0011] The OLED device display unit includes an organic functional layer and a cathode; the organic functional layer is provided between the anode and the cathode; and the upper cover plate is provided on the cathode.

[0012] A manufacturing method of the Micro OLED display module includes the following steps:

[0013] S1: Prepare the OLED control unit; thin the substrate and the upper cover plate; and assemble the OLED control unit, the substrate, and the upper cover plate into the red micro-display module, the green micro-display module, and the blue micro-display module;

[0014] S2: Process the X-cube prism;

[0015] S3: Glue the red micro-display module, the green micro-display module, and the blue micro-display module on the side surface of the X-cube prism.

[0016] The S1 includes:

[0017] S11: Process the driving circuit IC on the substrate; set the anode on the driving circuit IC and connect the anode to the driving circuit IC; cover the PDL on the insulating layer of the anode; process the organic functional layer between the anode and the cathode;

[0018] S12: Thin the substrate and the upper cover plate by chemical etching or physical grinding; process the thickness of the substrate to be 0.1 - 0.3 mm; process the thickness of the upper cover plate to be 0 - 0.1 mm.

[0019] The S2 includes:

[0020] S21: According to the display area and the border blackened area, process the prism blank area and the prism blackened area on the X - cube prism by using high - precision optical cold processing technology; use the optical coating equipment to prepare the required optical thin films according to the spectral bands of the red micro - display module, the green micro - display module, and the blue micro - display module and the specific design surface of the X - cube prism.

[0021] The S3 includes:

[0022] S31: Apply UV glue with a width of 0.1 - 0.5 mm and a height of 0.1 - 0.4 mm in the middle of the border blackened area; attach the red micro - display module, the green micro - display module, and the blue micro - display module to the X - cube prism in sequence, and perform pixel - level alignment between the red micro - display module, the green micro - display module, and the blue micro - display module.

[0023] The beneficial effects of the present invention are:

[0024] In the present invention, the red micro - display module, the green micro - display module, and the blue micro - display module are glued to the three sides of the X - cube prism in sequence; the red, green, and blue monochromatic micro - displays are combined through the X - cube prism to achieve full color, reducing the loss of light in the current mainstream full - colorization and improving the brightness of the entire component; compared with the current mainstream full - colorization scheme with red, green, and blue arranged side by side, this device uses monochromatic screens to achieve single - point full - colorization through the X - cube prism, and the screen resolution of the same size is increased by three times.

[0025] The red micro - display module, the green micro - display module, and the blue micro - display module of the present invention are connected to the X - cube prism through UV glue, eliminating the fixture on the X - cube prism in the prior art; at the same time, this device thins the substrate and the upper cover plate, thereby reducing the volume and weight of the entire module. Description of the Drawings

[0026] The following further details the specific embodiments of the present invention in conjunction with the drawings, where:

[0027] Figure 1 This is a schematic structural diagram of the Micro OLED display module of the present invention.

[0028] Figure 2 This is a schematic diagram of the color combination principle of the X-cube prism of the present invention.

[0029] Figure 3 This is a side view of the X-cube prism of the present invention.

[0030] Figure 4 This is a schematic structural diagram of the red micro display module of the present invention.

[0031] Figure 5 This is a side view of the red micro display module of the present invention.

[0032] The markings in the above figures are all:

[0033] In the figure, the markings are: 1. X-cube prism, 101. Light-emitting surface, 102. Red light incident surface, 103. Blue light incident surface, 104. Green light incident surface,

[0034] 2. Red micro display module,

[0035] 3. Green micro display module,

[0036] 4. Blue micro display module,

[0037] 5. Substrate,

[0038] 6. Upper cover plate, 601. Display area, 602. Blackened border area, 603. UV glue,

[0039] 7. OLED control unit, 701. FPC,

[0040] 8. Prism blank area, 801. Blackened prism area. Detailed implementation manners

[0041] The following is a more detailed description of the specific implementation manners of the present invention by referring to the accompanying drawings and describing the embodiments, aiming to help those skilled in the art have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention and facilitate its implementation.

[0042] Figures 1-5 The shown Micro OLED display module includes an X-cube prism 1; a red micro display module 2, a green micro display module 3 and a blue micro display module 4 are respectively connected to the X-cube prism 1.

[0043] In the present invention, a red micro-display module 2, a green micro-display module 3, and a blue micro-display module 4 are sequentially glued to three side surfaces of an X-cube prism 1; the red, green, and blue monochromatic micro-displays are used to combine colors through the X-cube prism 1 to achieve full color, reducing the loss of light in the current mainstream full-colorization and enhancing the brightness of the entire component; compared with the current mainstream full-colorization scheme where red, green, and blue are arranged side by side, this device uses a monochromatic screen to combine colors through the X-cube prism 1 to achieve single-point full-colorization, and the screen resolution of the same size is increased by three times.

[0044] The X-cube prism 1 is provided with a light-emitting surface 101; on one side of the light-emitting surface 101, there is a red light-incident surface 102, and on the other side of the light-emitting surface 101, there is a blue light-incident surface 103; on the side of the X-cube prism 1 away from the light-emitting surface 101, there is a green light-incident surface 104; the red micro-display module 2 is glued to the red light-incident surface 102; the green micro-display module 3 is glued to the green light-incident surface 104; the blue micro-display module 4 is glued to the blue light-incident surface 103.

[0045] The X-cube prism 1 is a color-combining prism; the red micro-display module 2, the green micro-display module 3, and the blue micro-display module 4 are respectively glued to the corresponding light-incident surfaces. When the red micro-display module 2, the green micro-display module 3, and the blue micro-display module 4 respectively generate red, green, and blue light and project it onto the corresponding light-incident surfaces, according to the optical characteristics of the thin film in the X-cube prism 1, part of the light is reflected and part is transmitted; the red light-incident surface 102 reflects red light and transmits other lights, the blue light-incident surface 103 reflects blue light and transmits other lights, and the green light-incident surface 104 reflects green light and transmits other lights. Through precisely designed optical angles and thin-film parameters, the three primary-color lights are precisely superimposed and synthesized inside the X-cube prism 1 after multiple reflections and transmissions, and finally a full-color image is output, achieving an optical display effect with high resolution and high color fidelity; at the same time, the red micro-display module 2, the green micro-display module 3, and the blue micro-display module 4 are connected to the X-cube prism 1 through a UV glue 603, eliminating the fixture on the X-cube prism 1 in the prior art and reducing the volume and weight of the entire device.

[0046] The red micro-display module 2, the green micro-display module 3, and the blue micro-display module 4 all include a substrate 5; an upper cover plate 6 is provided on the substrate 5; an OLED control unit 7 is provided between the substrate 5 and the upper cover plate 6; the OLED control unit 7 is connected with an FPC 701.

[0047] The substrate 5 is a silicon substrate or a glass substrate; the upper cover plate 6 cooperates with the substrate 5 to form a closed space, which can effectively protect the internal OLED control unit 7, prevent external environmental factors such as dust and water vapor from invading, and affect the performance of the OLED control unit 7; the OLED control unit 7 is responsible for driving the OLED pixels to emit light, and through precise electrical signal control, realizes the accurate display of monochromatic light; the FPC 701 is connected to the OLED control unit 7. The FPC 701 is a flexible circuit board with the characteristics of being thin, light and bendable. It can not only achieve efficient signal transmission, but also facilitate the flexible connection between the module and the external circuit, while saving space and improving the integration and application flexibility of the micro display module.

[0048] The red light incident surface 102, the blue light incident surface 103 and the green light incident surface 104 all include a prism blank area 8 and a prism blackened area 801; the prism blackened area 801 is arranged along the edge of the prism blank area 8; the upper cover plate 6 is provided with a display area 601 and a border blackened area 602; the border blackened area 602 is arranged along the display area 601; the border blackened area 602 is connected to the prism blackened area 801 through the UV glue 603.

[0049] The prism blank area 8 provides a channel for light transmission, ensuring that red, blue and green light can smoothly enter the X-cube prism 1 for synthesis to achieve the display function; the prism blackened area 801 is arranged along the edge of the prism blank area 8, which can effectively absorb and block stray light, prevent light reflection and scattering from interfering with the normal light path, and improve the purity and contrast of the display picture; the display area 601 of the upper cover plate 6 is used to allow the monochromatic light emitted by the OLED control unit 7 to pass through; the border blackened area 602 is arranged along the display area 601, which can not only block the non-display structure at the edge of the display area, improve the visual aesthetics, but also reduce the light leakage phenomenon around the display area; the UV glue 603 firmly connects the border blackened area 602 and the prism blackened area 801, which not only enhances the structural stability between the red micro display module 2, the green micro display module 3 and the blue micro display module 4 and the X-cube prism 1, but also further seals the connection part, avoids external light from entering and affecting the display effect, and at the same time ensures the integrity and reliability of the overall optical system.

[0050] The OLED control unit 7 includes a driving circuit IC, an anode and a PDL; the driving circuit IC is arranged on the substrate 5; the anode is arranged between the driving circuit IC and the PDL; the anode is connected to the driving circuit IC; the PDL is provided with an OLED device display unit; the driving circuit IC is connected to the FPC 701.

[0051] The driving circuit IC is fabricated on the substrate 5 by means of semiconductor film formation, coating, exposure, development and other processes. The driving circuit IC is responsible for processing external signals transmitted from the FPC 701. After calculation and processing, precise electrical signals are generated to drive the display unit of the OLED device to work, ensuring accurate image display. The anode is made of transparent conductive oxide ITO (indium tin oxide). The anode is disposed on the driving circuit IC and electrically connected to the driving circuit IC. The anode provides hole injection for the display unit of the OLED device. Under the control of the driving circuit IC, the anode can accurately transfer holes to the display unit of the OLED device, creating conditions for the recombination of holes and electrons, thereby achieving light emission. The PDL is the pixel definition layer. The PDL covers the anode layer and is used to isolate pixels and define the light-emitting region. The display unit of the OLED device emits monochromatic light under the drive of the driving circuit IC.

[0052] The display unit of the OLED device includes an organic functional layer and a cathode. The organic functional layer is disposed between the anode and the cathode. The upper cover plate 6 is disposed on the cathode.

[0053] The organic functional layer includes a hole transport layer HTL, a light-emitting layer EML, an electron transport layer ETL, etc., which are located between the PDL and the cathode. Holes are injected from the anode through the PDL opening into the hole transport layer HTL, and electrons are injected from the cathode into the hole transport layer HTL. The two recombine and emit light in the light-emitting layer EML.

[0054] A manufacturing method of a Micro OLED display module includes the following steps:

[0055] S1: Fabricate the OLED control unit 7; thin the substrate 5 and the upper cover plate 6; assemble the OLED control unit 7, the substrate 5 and the upper cover plate 6 into a red micro display module 2, a green micro display module 3 and a blue micro display module 4;

[0056] S2: Process the X-cube prism 1;

[0057] S3: Glue the red micro display module 2, the green micro display module 3 and the blue micro display module 4 onto the side surface of the X-cube prism 1.

[0058] In S1, the driving circuit IC of the microdisplay, the anode, and the pixel definition layer PDL of the display are prepared by processes such as semiconductor film formation, coating, exposure, and development. The display unit of the OLED device is prepared by processes such as evaporation and thin film encapsulation. By using the thinning equipment process of the semiconductor, the upper cover plate 6 and the substrate 5 are thinned. The thickness of the upper cover plate 6 is 0 - 0.1 mm, and the thickness of the IC substrate 5 is 0.1 - 0.3 mm. Using a high-precision module bonding device, the FPC701 is bonded to the thinned module screen. In S2, using the high-precision optical cold processing technology and based on the dimensions of the display area, the border, etc. of the screen body, the size specifications of the X-cube prism 1 are reasonably designed. For example, for the AA area of the display screen, the light transmission is left blank and the border is blackened. Using an optical coating device, the required optical thin film is prepared according to the spectral band of the monochromatic screen and the specific design surface of the X-cube prism 1 to achieve the function of the X-cube prism 1. In S3, using the module dispensing process, UV glue 603 with a width of 0.1 - 0.5 mm and a height of 0.1 - 0.4 mm is applied in the middle of the blackened area 602 of the border. Using the high-precision lamination technology, the monochromatic screen with UV glue 603 is laminated with the surface of the X-cube prism 1 in sequence. The light-emitting pixels between the monochromatic screens are laminated with pixel-level accuracy. That is, after the images displayed by the three monochromatic screens are synthesized, there are no problems such as double images and missing colors in the image quality.

[0059] S1 includes:

[0060] S11: Process the driving circuit IC on the substrate 5; set the anode on the driving circuit IC and connect the anode to the driving circuit IC; cover the PDL on the insulating layer of the anode; process the organic functional layer between the anode and the cathode.

[0061] S12: Thin the substrate 5 and the upper cover plate 6 by chemical etching or physical grinding; process the thickness of the substrate 5 to 0.1 - 0.3 mm; process the thickness of the upper cover plate 6 to 0 - 0.1 mm.

[0062] In S11, the preparation of the red microdisplay module 2, the green microdisplay module 3, and the blue microdisplay module 4 is realized. In S12, the upper cover plate 6 and the substrate 5 are thinned by the thinning equipment process of the semiconductor, thereby reducing the overall weight of the equipment.

[0063] S2 includes:

[0064] S21: According to the display area 601 and the blackened area 602 of the border, use the high-precision optical cold processing technology to process the prism blank area 8 and the prism blackened area 801 on the X-cube prism 1; use an optical coating device to prepare the required optical thin film according to the spectral band of the red microdisplay module 2, the green microdisplay module 3, and the blue microdisplay module 4 and the specific design surface of the X-cube prism 1.

[0065] The preparation of the X-cube prism 1 is realized in S21.

[0066] S3 includes:

[0067] S31: Apply a UV glue 603 with a width of 0.1 - 0.5 mm and a height of 0.1 - 0.4 mm in the middle of the blackened area 602 of the frame; sequentially bond the red micro display module 2, the green micro display module 3, and the blue micro display module 4 to the X-cube prism 1, and perform pixel-level alignment between the red micro display module 2, the green micro display module 3, and the blue micro display module 4.

[0068] The specific working process of the present invention is as follows:

[0069] S1: Prepare the OLED control unit 7; thin the substrate 5 and the upper cover plate 6; assemble the OLED control unit 7, the substrate 5, and the upper cover plate 6 into the red micro display module 2, the green micro display module 3, and the blue micro display module 4;

[0070] S2: Machine the X-cube prism 1;

[0071] S3: Glue the red micro display module 2, the green micro display module 3, and the blue micro display module 4 onto the side of the X-cube prism 1.

[0072] The present invention has been described exemplarily in combination with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention; or without improvement, the above concept and technical solution of the present invention are directly applied to other occasions, they are all within the protection scope of the present invention.

Claims

1. A Micro OLED display module, characterized in that: It includes an X-cube prism (1); a red micro display module (2), a green micro display module (3), and a blue micro display module (4) are respectively connected to the X-cube prism (1).

2. The Micro OLED display module according to claim 1, wherein: The X-cube prism (1) is provided with a light-emitting surface (101); a red light incident surface (102) is provided on one side of the light-emitting surface (101), and a blue light incident surface (103) is provided on the other side of the light-emitting surface (101); a green light incident surface (104) is provided on the side of the X-cube prism (1) away from the light-emitting surface (101); the red micro display module (2) is glued to the red light incident surface (102); the green micro display module (3) is glued to the green light incident surface (104); the blue micro display module (4) is glued to the blue light incident surface (103).

3. A Micro OLED display module according to claim 2, characterized in that: The red micro display module (2), the green micro display module (3), and the blue micro display module (4) all include a substrate (5); an upper cover plate (6) is provided on the substrate (5); an OLED control unit (7) is provided between the substrate (5) and the upper cover plate (6); the OLED control unit (7) is connected with an FPC (701).

4. A Micro OLED display module according to claim 3, characterized in that: The red light incident surface (102), the blue light incident surface (103), and the green light incident surface (104) all include a prism blank area (8) and a prism blackened area (801); the prism blackened area (801) is arranged along the edge of the prism blank area (8); a display area (601) and a border blackened area (602) are provided on the upper cover plate (6); the border blackened area (602) is arranged along the display area (601); the border blackened area (602) is connected to the prism blackened area (801) through the UV glue (603).

5. A Micro OLED display module according to any one of claims 3-4, characterized in that: The OLED control unit (7) includes a driving circuit IC, an anode, and a PDL; the driving circuit IC is arranged on the substrate (5); the anode is arranged between the driving circuit IC and the PDL; the anode is connected to the driving circuit IC; an OLED device display unit is provided on the PDL; the driving circuit IC is connected to the FPC (701).

6. A Micro OLED display module according to claim 5, characterized in that: The OLED device display unit includes an organic functional layer and a cathode; the organic functional layer is arranged between the anode and the cathode; the upper cover plate (6) is arranged on the cathode.

7. A manufacturing method of the Micro OLED display module according to any one of claims 1-6, characterized in that: It includes the following steps: S1: Prepare the OLED control unit (7); thin the substrate (5) and the upper cover plate (6); assemble the OLED control unit (7), the substrate (5), and the upper cover plate (6) into a red micro display module (2), a green micro display module (3), and a blue micro display module (4); S2: Process the X-cube prism (1); S3: Glue the red micro display module (2), the green micro display module (3), and the blue micro display module (4) to the side surface of the X-cube prism (1).

8. The manufacturing method according to claim 7, characterized in that: The S1 includes: S11: Process the driving circuit IC on the substrate (5); set the anode on the driving circuit IC and connect the anode to the driving circuit IC; cover the insulating layer of the anode with PDL; process the organic functional layer between the anode and the cathode. S12: Thin the substrate (5) and the upper cover plate (6) by chemical etching or physical grinding; process the thickness of the substrate (5) to be 0.1 - 0.3 mm; process the thickness of the upper cover plate (6) to be 0 - 0.1 mm.

9. The manufacturing method according to claim 8, characterized in that: The S2 includes: S21: According to the display area (601) and the border blackening area (602), process the prism blank area (8) and the prism blackening area (801) on the X - cube prism (1) by using high - precision optical cold processing technology; use the optical coating equipment to prepare the required optical thin films based on the spectral bands of the red micro - display module (2), the green micro - display module (3) and the blue micro - display module (4) and the specific design surface of the X - cube prism (1).

10. The manufacturing method according to claim 9, characterized in that: The S3 includes: S31: Apply UV glue (603) with a width of 0.1 - 0.5 mm and a height of 0.1 - 0.4 mm in the middle of the border blackening area (602); sequentially bond the red micro - display module (2), the green micro - display module (3) and the blue micro - display module (4) to the X - cube prism (1), and perform pixel - level alignment between the red micro - display module (2), the green micro - display module (3) and the blue micro - display module (4).

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