A system and method for repairing bright spot defects in microlens array display devices.

Abstract

This invention provides a system and method for repairing bright spot defects in microlens array display devices, particularly relating to the field of laser repair technology for silicon-based Micro-OLED microlens array display devices. The system includes a laser emission module and an objective lens module arranged sequentially. The laser emission module emits laser light downwards along a first direction in a horizontal plane. The objective lens module receives the laser light emitted by the laser emission module and controls the laser to irradiate through the microlens film layer to reach the light-emitting pixel layer. The objective lens module includes a driving component and an objective lens. The driving component can drive the objective lens to deflect by an angle in a vertical plane containing a second direction to control the incident angle of the laser light reaching the microlens film layer, ensuring that the first optical path and / or the second optical path are simultaneously perpendicular to the objective lens and the upper surface of the light-emitting pixel layer. This invention's system for repairing bright spot defects in microlens array display devices can stably repair bright spots in different areas of the product, improving production efficiency.

Description

Technical Field

[0001] This invention relates to the field of Micro-OLED laser repair technology, and in particular to a system and method for repairing bright spot defects in microlens array display devices. Background Technology

[0002] Currently, for Micro-OLED products, the main repair method involves using lasers to disrupt the OLED's emitting layer or anode structure, transforming bright spots into dark spots. Specifically, in general processing, the objective lens is positioned perpendicular to the product, and the emitting layer is damaged by vertical laser irradiation to achieve the repair effect. However, for Micro-OLED products with microlens arrays (hereinafter referred to as microlenses), if the traditional OLED bright spot repair method is still used, while the laser offset is small in the central area of ​​the microlens, allowing the laser to penetrate the microlens and vertically irradiate the emitting layer for bright spot repair, at the lens edges, if the laser is still used to penetrate the microlens for vertical irradiation, refraction occurs when the laser is incident perpendicularly, preventing it from reaching the emitting layer. In the actual repair process, only offset processing can be used, resulting in poor process stability, low yield, and inability to achieve large-scale mass production. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a bright spot defect repair system and method for microlens array display devices, capable of reliably repairing bright spots in different areas of the product.

[0004] A bright spot defect repair system for a microlens array display device according to a first aspect of the present invention includes a laser emission module and an objective lens module arranged sequentially from top to bottom.

[0005] The laser emission module is used to emit laser light at an offset within space;

[0006] The objective lens module is used to receive the laser emitted by the laser emission module and control the laser to irradiate the microlens film layer that passes through the microlens array display device and reach the light-emitting pixel layer.

[0007] The objective lens module includes a driving component and an objective lens. The driving component can drive the objective lens to deflect by an angle in the vertical plane where the second direction is located to control the incident angle of the laser reaching the microlens film layer, so as to ensure that the first optical path and / or the second optical path are simultaneously perpendicular to the objective lens and the upper surface of the light-emitting pixel layer.

[0008] According to some embodiments of the present invention, the repair system further includes a control module.

[0009] The control module establishes models for different areas of the product based on the size and pixel distribution of the microlens unit, and establishes a mapping relationship between the defect location of different areas and the objective lens deflection angle and laser repair process parameters.

[0010] According to some embodiments of the present invention, the laser emission module includes a laser emitting device and a galvanometer.

[0011] The galvanometer is used to receive the laser emitted by the laser emitting device and control the laser emission angle.

[0012] According to some embodiments of the present invention, the driving component is an arc-shaped linear motor, and the driving end of the arc-shaped linear motor is connected to the objective lens.

[0013] According to some embodiments of the present invention, the repair system further includes an imaging device.

[0014] The imaging device is located on one side above the objective lens module, and the imaging device is used to receive the light emitted by the light-emitting pixel layer through the objective lens module.

[0015] According to some embodiments of the present invention, the imaging device is a CCD camera.

[0016] According to some embodiments of the present invention, the repair system further includes an optical path guiding device disposed between the objective lens module and the imaging device.

[0017] According to some embodiments of the present invention, the optical path guiding device includes a beam splitter, which is a plane mirror, wherein one side of the beam splitter transmits light and the other side reflects light.

[0018] The beam splitter is tilted between the objective lens module and the imaging device, with its upper side being a light-transmitting surface and its lower side being a reflective surface.

[0019] The lower side of the beam splitter faces one side of the imaging device.

[0020] According to some embodiments of the present invention, the tilt angle of the beam splitter is 45°.

[0021] According to some embodiments of the present invention, the repair system further includes an illumination device disposed on one side of the imaging device.

[0022] According to some embodiments of the present invention, the microlens array display device comprises, from top to bottom, the microlens film layer, the light-emitting pixel layer, and the substrate stacked sequentially.

[0023] A repair method for a bright spot defect repair system for a microlens array display device according to a second aspect of the present invention, applied to the bright spot defect repair system for a microlens array display device according to any of the first aspects of the present invention, includes the following steps:

[0024] S1, Models are built for different areas of the product based on the size of the microlens unit and the pixel distribution;

[0025] S2, Based on the model, establish the mapping relationship between the defect location in different regions and the objective lens deflection angle and laser repair process parameters.

[0026] The formula for calculating the objective lens offset angle θ is:

[0027] θ = K*Z, K = f(L,Sag)

[0028] Where K is the offset coefficient, which is a function of the aperture L of the microlens subunit and the maximum sagittal Sag of the microlens subunit, and Z is the offset of the laser emission module along the first direction.

[0029] S3, based on the mapping relationship, control the objective lens to deflect in the vertical plane where the second direction is located, so as to repair the target defect location according to the corresponding laser repair process parameters.

[0030] The bright spot defect repair system for microlens array display devices according to embodiments of the present invention has at least the following beneficial effects:

[0031] The microlens array display device bright spot defect repair system of this invention can perform stable vertical irradiation repair on the central area of ​​the microlens, and can also repair the edge area of ​​the microlens. By adjusting the angle of objective lens offset, it can greatly reduce the pixel image distortion caused by refraction, thereby optimizing the image quality. The significant improvement in image quality allows for precise repair of the luminescent pixel layer, thereby improving production efficiency.

[0032] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0034] Figure 1 This is a schematic diagram of laser irradiation for a microlens array display device bright spot defect repair system according to an embodiment of the present invention;

[0035] Figure 2 This is an imaging schematic diagram of the bright spot defect repair system for a microlens array display device according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the repair system for a bright spot defect repair system in a microlens array display device according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram showing the distribution of the light-emitting pixels and microlens structure according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram showing the relationship between the aperture of the microlens subunit, the maximum sagittal height of the microlens subunit, and the laser refraction angle in an embodiment of the present invention.

[0039] Figure label:

[0040] Laser emission module 10, galvanometer 11, motor 111, reflector 112, objective lens module 20, drive assembly 21, objective lens 22, laser 30, imaging device 40, optical path guide device 50, microlens display 60, microlens film layer 61, light-emitting pixel layer 62, substrate 63, light-emitting pixel 70, microlens structure 80. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention are within the scope of protection of the present invention.

[0042] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship also changes accordingly.

[0043] The following is a detailed description, with reference to the accompanying drawings, of the microlens array display device bright spot defect repair system according to an embodiment of the present invention.

[0044] Reference Figure 1 and Figure 2 As shown, the microlens display 60 includes, from top to bottom, a microlens film layer 61, a light-emitting pixel layer 62, and a substrate 63 stacked sequentially.

[0045] A bright spot defect repair system for a microlens array display device according to a first aspect of the present invention may include a laser emission module 10 and an objective lens module 20 arranged sequentially from top to bottom. The laser emission module 10 is used to emit a laser 30 that can be offset in space. The objective lens module 20 is used to receive the laser 30 emitted by the laser emission module 10 and control the laser 30 to irradiate through the microlens film layer 61 to reach the light-emitting pixel layer 62. The objective lens module 20 includes a driving assembly 21 and an objective lens 22 connected vertically. The driving assembly 21 drives the objective lens 22 to deflect by an angle in a vertical plane containing a second direction to control the incident angle of the laser 30 reaching the microlens film layer 61, thereby ensuring that the first optical path and / or the second optical path are simultaneously perpendicular to both the objective lens and the upper surface of the light-emitting pixel layer.

[0046] Specifically, in the microlens array display device bright spot defect repair system of this embodiment of the invention, the laser emission module 10 is located above the objective lens module 20 and adjusts the downward emission position of the laser in a first direction (e.g., the length or width direction of the microlens display 60) in a horizontal plane. Additionally, the laser emission module 10 can also adjust the downward emission angle of the laser. The objective lens film group 20 receives the laser 30 emitted by the laser emission module 10. The objective lens film group 20 includes a driving component 21 and an objective lens 22. The driving component controls the objective lens 22 to deflect in a vertical plane containing a second direction (wherein the second direction is vertically downward), thereby controlling the incident angle of the laser 30 as it reaches the microlens display 60 through the objective lens 22. This ensures that the first optical path (i.e., the optical path of the laser emitted by the laser emission module 10 reaching the light-emitting pixel layer 62) is maintained. Figure 1 (as shown) and / or the second optical path (i.e., the optical path from the light emitted by the light-emitting pixel layer 62 to the imaging device, such as...) Figure 2 (As shown) It is perpendicular to both the objective lens 22 and the upper surface of the light-emitting pixel layer 62. Here, "perpendicular to the objective lens 22" means that the light path enters the objective lens 22 perpendicular to the mirror surface of the objective lens 22 and passes through the center line of the objective lens 22.

[0047] Reference Figure 3 As shown, the general repair method involves laser repair of the microlens edge area ( Figure 3 On the right side, the light emitted from the light-emitting pixel layer 62 is refracted after passing through the microlens film layer 61, causing a significant shift in the light entering the objective lens 22. This results in image distortion when capturing the light emitted from the objective lens 22, thus affecting the observation of the repaired image. However, the bright spot defect repair system for microlens array display devices according to this embodiment of the invention, even when performing laser repair on the edge area of ​​the microlens, is corrected by the shift of the objective lens 22. Figure 3(Left side) By changing the angle between the objective lens 22 and the microlens display 60, it is ensured that the light from the luminescent pixel layer 62 enters the objective lens 22 from the center region, thus enabling normal capture of the light emitted by the objective lens 22. Furthermore, the microlens array display device bright spot defect repair system of this embodiment can perform stable vertical irradiation repair on the central region of the microlens, and for the edge region of the microlens, it can also significantly reduce pixel image distortion caused by refraction by adjusting the angle of the objective lens offset, optimizing the image quality. This significant improvement in image quality allows for precise repair of the luminescent pixel layer, thereby also improving production efficiency.

[0048] In some embodiments of the present invention, the repair system may further include a control module (not shown), which establishes models of different areas of the product based on the microlens unit size and pixel distribution, and establishes a mapping relationship between the defect location of different areas and the objective lens deflection angle and laser repair process parameters.

[0049] Reference Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the laser emission module 10 may include a laser emitting device (not shown) and a galvanometer 11, which is used to receive the laser 30 emitted by the laser emitting device and control the emission angle of the laser 30.

[0050] Specifically, the laser emitting device can be positioned on one side at the same height as the galvanometer 11, emitting laser light 30 towards the galvanometer 11. The galvanometer 11 contains a motor 111 and a reflecting mirror 112. The motor 111 adjusts the angle of the reflecting mirror 112, thereby adjusting the downward emission angle θ of the laser 30. Furthermore, the laser emitting device and the galvanometer 11 can be connected together to the same mounting bracket. By driving a moving module on the mounting bracket, the laser emitting device and the galvanometer 11 can move along the length or width of the microlens display 60 located at the bottom, thereby adjusting the offset of the laser 30 emission position.

[0051] Reference Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the drive component 21 is an arc-shaped linear motor, and the downward-facing drive end of the arc-shaped linear motor is connected to the objective lens 22.

[0052] In other words, the objective lens 22 is driven to deflect at a predetermined angle in the vertical plane by an arc-shaped linear motor, which is precise and reliable.

[0053] Reference Figure 1 and Figure 2As shown, in some embodiments of the present invention, the repair system may further include an imaging device 40, which is disposed on the upper side of the objective lens module 20. The imaging device 40 is used to receive light emitted by the light-emitting pixel layer 62 through the objective lens module 20.

[0054] In other words, by setting an imaging device 40 above the objective lens module 20, the imaging device 40 receives the light emitted by the light-emitting pixel layer 62 through the objective lens 22 to form an image, and performs precise repair based on the generated image.

[0055] In some embodiments of the present invention, the imaging device 40 may be a CCD camera.

[0056] Reference Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the repair system may further include an optical path guide device 50, which is disposed between the objective lens module 20 and the imaging device 40.

[0057] In other words, an optical path guide device 50 is provided between the objective lens module 20 and the imaging device 40 to accurately guide the light emitted from the objective lens module 20 to the imaging device 40, thereby improving the imaging quality of the imaging device 40.

[0058] Reference Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the optical path guiding device 50 may include a beam splitter, which is a plane mirror. One side of the beam splitter is transparent and the other side is reflective. The beam splitter is tilted between the objective lens module 20 and the imaging device 40. Its upper side is a transparent surface and its lower side is a reflective surface. The lower side of the beam splitter faces the imaging device 40 on one side.

[0059] In other words, the optical path guiding device 50 can be configured as a planar beam splitter that transmits light on one side and reflects light on the other side. Thus, the lower side of the beam splitter is inclined towards the imaging device 40 and positioned between the objective lens module 20 and the imaging device 40. On the one hand, the laser 30 emitted by the laser emission module 10 can pass through the beam splitter from the upper side and enter the objective lens 22. The light emitted by the light-emitting pixel layer 62 through the objective lens 22 is reflected by the lower side of the beam splitter to the imaging device 40 to achieve image imaging.

[0060] Preferably, the tilt angle of the beam splitter is 45°.

[0061] In some embodiments of the present invention, the repair system may further include an illumination device disposed on one side of the imaging device 40.

[0062] The repair method of the microlens array display device bright spot defect repair system according to the second aspect embodiment of the present invention, applied to the microlens array display device bright spot defect repair system of any of the first aspects, may include the following steps:

[0063] S1, Models are built for different areas of the product based on the size of the microlens unit and the pixel distribution.

[0064] As an example, such as Figure 4 As shown, this is a schematic diagram of the distribution of the luminescent pixels 70 and the microlens structure 80. Since the structure of each product remains basically fixed, different areas of the product are modeled based on the microlens unit size and pixel distribution. In actual manufacturing, the entire microlens product is divided into N regions, and one region is selected as shown... Figure 3 As shown, the overlap δ between the arrangement of light-emitting pixels and the arrangement of microlens structures is relatively high near the center region, and the laser beam enters the light-emitting pixels perpendicularly for processing, with the objective lens requiring almost no offset or having a very small offset; however, near the edge region, the overlap δ between the arrangement of light-emitting pixels and the arrangement of microlens structures is poor, and at this time, the laser beam is refracted, causing the processing position to shift.

[0065] Among them, the functional relationship between the overlap δ of the arrangement of light-emitting pixels and the arrangement of microlens structure and the objective lens offset angle θ is δ=q(θ). The smaller δ is, the smaller the angle θ that the objective lens needs to be offset is.

[0066] S2, Based on the model, establish the mapping relationship between the defect location in different regions and the objective lens deflection angle and laser repair process parameters.

[0067] The formula for calculating the objective lens offset angle θ is:

[0068] θ = K*Z, K = f(L,Sag)

[0069] Where K is the offset coefficient, which is a function of the aperture L of the microlens subunit and the maximum sagittal Sag of the microlens subunit, and Z is the offset of the laser emission module along the first direction.

[0070] Specifically, such as Figure 5 As shown, the larger the aperture L of the microlens subunit, the smaller the laser refraction angle α, and the smaller the required laser offset θ; similarly, the larger the maximum sag Sag of the microlens subunit, the larger the laser refraction angle α, and the larger the required laser offset θ. Here, the first direction refers to the length or width direction of the microlens display 60.

[0071] In other words, after modeling each region separately, the corresponding parameters for the defect locations in different regions are set, including the objective lens offset angle, laser processing energy, laser spot size, and other laser repair process parameters, and then saved.

[0072] S3, based on the mapping relationship, controls the objective lens to deflect in the vertical plane where the second direction is located, so as to repair the target defect location with the corresponding laser repair process parameters.

[0073] Specifically, in the actual processing, after the CCD system confirms the location of the defect, it controls the objective lens to deflect in the vertical plane in the vertically downward direction according to the mapping relationship, and selects the corresponding processing parameters, which can greatly improve processing efficiency, process stability and overall yield.

[0074] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A system for repairing bright spot defects in a microlens array display device, characterized in that, It includes a laser emission module, an objective lens module, and an imaging device arranged sequentially from top to bottom. The laser emission module is used to emit laser light at an offset within space; The objective lens module is used to receive the laser emitted by the laser emission module and control the laser to irradiate the microlens film layer that passes through the microlens array display device and reach the light-emitting pixel layer; the microlens array display device includes, from top to bottom, the microlens film layer, the light-emitting pixel layer and the substrate stacked sequentially. The imaging device is located on one side above the objective lens module, and the imaging device is used to receive the light emitted by the light-emitting pixel layer through the objective lens module; The objective lens module includes a driving component and an objective lens. The driving component can drive the objective lens to deflect by an angle in the vertical plane containing the second direction to control the incident angle of the laser reaching the microlens film layer, so as to ensure that the first optical path and the second optical path are simultaneously perpendicular to the objective lens and the upper surface of the light-emitting pixel layer. The second direction is a vertically downward direction. The first optical path is the optical path of the laser emitted by the laser emission module reaching the light-emitting pixel layer. The second optical path is the optical path of the light emitted by the light-emitting pixel layer to the imaging device. "Perpendicular to the objective lens" means that the optical path enters the objective lens perpendicular to the mirror surface of the objective lens and passes through the center line of the objective lens.

2. The microlens array display device bright spot defect repair system according to claim 1, characterized in that, The repair system also includes a control module. The control module establishes models for different areas of the product based on the size and pixel distribution of the microlens unit, and establishes a mapping relationship between the defect location of different areas and the objective lens deflection angle and laser repair process parameters.

3. The bright spot defect repair system for microlens array display devices according to claim 1, characterized in that, The laser emission module includes a laser emitting device and a galvanometer. The galvanometer is used to receive the laser emitted by the laser emitting device and control the laser emission angle.

4. The bright spot defect repair system for microlens array display devices according to claim 1, characterized in that, The driving component is an arc-shaped linear motor, and the driving end of the arc-shaped linear motor is connected to the objective lens.

5. The bright spot defect repair system for microlens array display devices according to claim 1, characterized in that, The imaging device is a CCD camera.

6. The bright spot defect repair system for microlens array display devices according to claim 1, characterized in that, The repair system also includes an optical path guiding device, which is located between the objective lens module and the imaging device.

7. The bright spot defect repair system for microlens array display devices according to claim 6, characterized in that, The optical path guiding device includes a beam splitter, which is a plane mirror. One side of the beam splitter transmits light, while the other side reflects light. The beam splitter is tilted between the objective lens module and the imaging device, with its upper side being a light-transmitting surface and its lower side being a reflective surface. The lower side of the beam splitter faces one side of the imaging device.

8. The bright spot defect repair system for microlens array display devices according to claim 7, characterized in that, The tilt angle of the beam splitter is 45°.

9. The bright spot defect repair system for microlens array display devices according to claim 1, characterized in that, The repair system also includes an illumination device located on one side of the imaging device.

10. A repair method for a bright spot defect repair system for a microlens array display device according to any one of claims 1-9. Includes the following steps: S1, Models are built for different areas of the product based on the size of the microlens unit and the pixel distribution; S2, Based on the model, establish the mapping relationship between the defect location in different regions and the objective lens deflection angle and laser repair process parameters. The objective lens deflection angle The calculation formula is: in, K is the offset coefficient, which is a function of the aperture L of the microlens subunit and the maximum sagittal Sag of the microlens subunit; Z is the offset of the laser emission module along the first direction. S3, based on the mapping relationship, control the objective lens to deflect in the vertical plane where the second direction is located, so as to repair the target defect location according to the corresponding laser repair process parameters.

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