Display module and repair method for display module

Abstract

This display module comprises: a substrate on which a plurality of thin film transistors are formed; and a plurality of pixels disposed on the plurality of thin film transistors. Each of the plurality of pixels includes a red LED, a green LED, and a blue LED. Among the plurality of pixels, at least one pixel in which the red LED or the green LED does not emit light includes a light conversion layer provided on the blue LED.

Description

Display module and repair method for the display module

[0001] The present disclosure relates to a display module, and more specifically, to a display module in which each of a plurality of pixels is formed of a red LED, a green LED, and a blue LED, and a method for repairing a display module having such a structure.

[0002] LEDs (Light Emitting Diodes) are widely used not only as light sources for lighting devices but also as light sources for display devices of various electronic products such as TVs, mobile phones, PCs, laptop PCs, wearable devices, PDAs, etc.

[0003] Recently, micro LEDs with a size of less than 100 μm have been developed, and micro LEDs are attracting attention as light-emitting devices for next-generation displays because they have a faster response speed, lower power consumption, and higher brightness compared to conventional LEDs.

[0004] Display modules can be manufactured by chip processing of LED wafers and undergoing transfer and bonding processes.

[0005] In the manufacturing process, LEDs may have epitaxial defects, chip process defects, transfer and bonding process defects, etc., and these defects may later become the cause of dead pixels or defective pixels.

[0006] For example, a defective pixel may occur when power is applied to the display module and none of the red LED, green LED, or blue LED constituting the pixel emits light. That is, a pixel defect may occur when one of the red LED, green LED, or blue LED of the pixel fails to turn on when power is applied to the display module.

[0007] A display module according to one or more embodiments of the present disclosure may include: a substrate having a plurality of thin-film transistors formed thereon; and a plurality of pixels disposed on the plurality of thin-film transistors. Each of the plurality of pixels may include a red LED, a green LED, and a blue LED. Among the plurality of pixels, at least one pixel in which the red LED or the green LED does not emit light may include a light conversion layer provided on the upper side of the blue LED.

[0008] According to one or more embodiments of the present disclosure, the green LED of the at least one pixel does not emit light, and the light conversion layer includes a green light conversion layer installed above the blue LED of the at least one pixel, and the green light conversion layer may be formed to convert blue light emitted from the blue LED of the at least one pixel into green light.

[0009] According to one or more embodiments of the present disclosure, the red LED of the at least one pixel does not emit light, and the light conversion layer includes a red light conversion layer installed above the blue LED of the at least one pixel, and the red light conversion layer may be formed to convert blue light emitted from the blue LED of the at least one pixel into red light.

[0010] According to one or more embodiments of the present disclosure, the light conversion layer may be formed from any one of a quantum dot, a perovskite, or a phosphor.

[0011] According to one or more embodiments of the present disclosure, a protective layer formed on the plurality of pixels may be further included.

[0012] According to one or more embodiments of the present disclosure, the at least one pixel may further include a blue light blocking layer formed on the light conversion layer.

[0013] According to one or more embodiments of the present disclosure, the red LED, the green LED, and the blue LED of each of the plurality of pixels may be formed as micro LEDs.

[0014] A repair method for a display module comprising a plurality of pixels including a red LED, a green LED, and a blue LED according to one or more embodiments of the present disclosure may include: finding a pixel among the plurality of pixels in which the red LED or the green LED has not emitted light; applying a light conversion layer formed to emit red light or green light on the upper side of the blue LED of the pixel found above; curing the light conversion layer; and forming a protective layer on a portion of the pixel found above.

[0015] According to one or more embodiments of the present disclosure, after the step of finding a pixel among the plurality of pixels in which the red LED or the green LED does not emit light, the method may further include the step of locally removing a protective layer provided on the upper side of the blue LED of the pixel found.

[0016] According to one or more embodiments of the present disclosure, after the step of curing the light conversion layer, a blue light blocking layer that absorbs blue light is applied to the upper surface of the light conversion layer, and the step of curing the blue light blocking layer may be further included.

[0017] According to one or more embodiments of the present disclosure, the light conversion layer may be applied using ink-jet printing or electrohydrodynamic (EHD) printing.

[0018] According to one or more embodiments of the present disclosure, the green LED of the pixel found above does not emit light, and the light conversion layer may include a green light conversion layer formed to convert blue light emitted from the blue LED of the pixel found above into green light.

[0019] According to one or more embodiments of the present disclosure, the red LED of the pixel found above does not emit light, and the light conversion layer may include a red light conversion layer formed to convert blue light emitted from the blue LED of the pixel found above into red light.

[0020] The above-described or other aspects, features, and benefits of embodiments of the present disclosure will become more apparent from the following description with reference to the accompanying drawings. In the accompanying drawings:

[0021] FIG. 1 is a schematic plan view of a display module according to one or more embodiments of the present disclosure.

[0022] FIG. 2 is a schematic cross-sectional view of a pixel of a display module according to one or more embodiments of the present disclosure.

[0023] FIG. 3 is a cross-sectional view showing a state in which a red LED does not emit light in a pixel of a display module according to one or more embodiments of the present disclosure.

[0024] FIG. 4 is a cross-sectional view showing a state in which a pixel in which a red LED of a display module according to one or more embodiments of the present disclosure has not emitted light is repaired.

[0025] FIG. 5 is a cross-sectional view showing a state in which a green LED does not emit light in a pixel of a display module according to one or more embodiments of the present disclosure.

[0026] FIG. 6 is a cross-sectional view showing a state in which a pixel in which a green LED of a display module according to one or more embodiments of the present disclosure has not emitted light is repaired.

[0027] FIG. 7 is a cross-sectional view showing a state in which a pixel in which a red LED of a display module according to one or more embodiments of the present disclosure has not emitted light is repaired.

[0028] FIG. 8 is a cross-sectional view showing a state in which a pixel that failed to emit light from a green LED of a display module according to one or more embodiments of the present disclosure is repaired.

[0029] FIG. 9 is a flowchart for explaining a repair method for a display module according to one or more embodiments of the present disclosure.

[0030] FIGS. 10a, FIGS. 10b, and FIGS. 10c are drawings illustrating a method for repairing a display module according to one or more embodiments of the present disclosure.

[0031] FIG. 11 is a flowchart for explaining a repair method for a display module according to one or more embodiments of the present disclosure.

[0032] FIGS. 12a, FIGS. 12b, FIGS. 12c, and FIGS. 12d are drawings for explaining a method of repairing a display module according to one or more embodiments of the present disclosure.

[0033] The various embodiments of this document and the terms used therein are not intended to limit the technical features described in this document to specific embodiments, and should be understood to include various modifications, equivalents, or alternatives of said embodiments.

[0034] In relation to the description of the drawings, similar reference numerals may be used for similar or related components.

[0035] The singular form of the noun corresponding to the item may include one or multiple items, unless the relevant context clearly indicates otherwise.

[0036] In this document, each of the phrases such as "A or B", "at least one of A and B", "at least one of A or B", "A, B or C", "at least one of A, B and C", and "at least one of A, B, or C" may include any one of the items listed together in the corresponding phrase, or all possible combinations thereof.

[0037] The term "and / or" includes a combination of multiple related described components or any of the multiple related described components.

[0038] Terms such as "first," "second," or "first" or "second" may be used simply to distinguish a component from another corresponding component and do not limit the components in other aspects (e.g., importance or order).

[0039] Where any (e.g., 1st) component is referred to as "coupled" or "connected" to another (e.g., 2nd) component, with or without the terms "functionally" or "communicationly," it means that said any component may be connected to said other component directly (e.g., via a wire), wirelessly, or through a third component.

[0040] Terms such as "include" or "have" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in this document, and do not preclude the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0041] When it is said that a component is "connected," "combined," "supported," or "in contact" with another component, this includes not only cases where the components are directly connected, combined, supported, or in contact, but also cases where they are indirectly connected, combined, supported, or in contact through a third component.

[0042] When it is said that a component is located "on" another component, this includes not only cases where one component is in contact with the other, but also cases where another component exists between the two components.

[0043] Additionally, terms such as 'front end', 'rear end', 'upper part', 'lower part', 'upper part', and 'lower part' used in this disclosure are defined based on the drawings, and the shape and position of each component are not limited by these terms.

[0044] A display module manufactured according to one or more embodiments of the present disclosure may include a substrate having a Thin Film Transistor (TFT) layer formed on one surface, a plurality of Light Emitting Diodes (LEDs) arranged on the TFT layer, and wiring that electrically connects circuits arranged on the rear surface of the substrate. Here, the substrate may be any one of a glass substrate, a flexible substrate, and a plastic substrate, and may be referred to as a backplane.

[0045] A substrate of a display module according to one or more embodiments of the present disclosure may include a rear substrate electrically connected to the rear surface of the substrate via a Flexible Printed Circuit (FPC). Here, the rear substrate may be formed in the form of a thin film with a thickness of several tens of μm (e.g., 50 μm or less) or in the form of a thin glass. When the rear substrate is formed in the form of a thin film, it may be formed from any one of a plastic material, for example, PI (Polyimide), PET (Polyethylene Terephthalate), PES (Polythersulfone), PEN (Polyethylene Naphtalate), and PC (Polycarbonate).

[0046] A substrate according to one or more embodiments of the present disclosure may have lateral wiring formed on an edge portion, and may electrically connect a first connection pad formed on the edge portion of the front surface of the substrate and a second connection pad formed on the rear surface of the substrate. To this end, the lateral wiring may be formed along the front surface, side surface, and rear surface of the substrate, with one end electrically connected to the first connection pad and the other end electrically connected to the second connection pad. At this time, since a portion of the lateral wiring is formed on the side surface of the substrate, it may protrude beyond the side surface of the TFT substrate by the thickness of the lateral wiring. In this case, the rear surface of the substrate may be electrically connected to the second connection pad through an FPC. A driver integrated circuit mounted on the rear surface of the TFT substrate may be directly connected to the second connection pad or indirectly connected through a separate wiring.

[0047] In addition, the display module of the present disclosure can be applied as a single unit to wearable devices, portable devices, handheld devices, and various electronic or automotive products requiring displays, and can be applied to small display devices such as personal computer monitors and TVs, and large display devices such as digital signage and electronic displays through multiple assembly arrangements.

[0048] The LED of the present disclosure may be a semiconductor chip made of an inorganic light-emitting material and capable of emitting light on its own when power is supplied.

[0049] Furthermore, the LED of the present disclosure may be a micro LED, which is attracting attention as a light-emitting element for next-generation displays due to its fast response speed, low power consumption, and high brightness. Such micro LEDs have a higher efficiency in converting electricity into photons compared to conventional LCDs (liquid crystal displays) or OLEDs (Organic Light Emitting Diodes). In other words, they have a higher "brightness per watt" compared to conventional LCDs or OLEDs. Accordingly, micro LEDs can produce the same brightness with approximately half the energy compared to conventional LEDs (with dimensions exceeding 100㎛ x 100㎛) or OLEDs. In addition, micro LEDs enable high resolution, excellent color, contrast, and brightness, allowing for accurate representation of a wide range of colors and the creation of a clear screen even in bright sunlight outdoors. Furthermore, micro LEDs are resistant to burn-in and generate little heat, ensuring a long lifespan without deformation.

[0050] The present disclosure aims to provide a display module and a repair method for a display module that can improve visibility by reducing or minimizing defects in the green LED and red LED of a display module without removing or reattaching the green LED or red LED, in the event that a defect occurs in which the green LED or red LED fails to emit light in a pixel comprising a red LED, a green LED, and a blue LED.

[0051] Hereinafter, embodiments of a display module and a repair method for a display module according to the present disclosure will be described in detail with reference to the attached drawings.

[0052] FIG. 1 is a schematic plan view of a display module (1) according to one or more embodiments of the present disclosure.

[0053] Referring to FIG. 1, the display module (1) may include a substrate (20) on which a thin film transistor is formed and a plurality of pixels (10) formed on the substrate (20) which are electrically connected to the thin film transistor.

[0054] A display module (1) can operate as a display including a plurality of pixels (10). According to one embodiment, a plurality of display modules (1) can be connected to form a single large display device. Then, the connected plurality of display modules (1) can operate as a single display.

[0055] The substrate (20) can display information such as images, characters, etc. by operating a plurality of pixels (10) arranged on the substrate (20). The substrate (20) can be formed to independently drive a red LED (light emitting diode) (11), a green LED (12), and a blue LED (13) that form the pixels (10) described later.

[0056] According to one embodiment, a plurality of pixels (10) may be arranged in a matrix shape on a substrate (20) in a first direction and in a second direction perpendicular to the first direction.

[0057] However, the arrangement of a plurality of pixels (10) of a display module (1) according to one or more embodiments of the present disclosure is not limited thereto. As another example, a plurality of pixels (10) may be arranged in various patterns, such as a zigzag shape.

[0058] Since a plurality of pixels (10) of a display module (1) according to one or more embodiments of the present disclosure have the same structure, only one pixel (10) will be described below.

[0059] FIG. 2 is a schematic cross-sectional view of a pixel (10) of a display module (1) according to one or more embodiments of the present disclosure.

[0060] Referring to FIG. 2, a pixel (10) according to one or more embodiments of the present disclosure may be installed on top of a thin-film transistor (21).

[0061] The pixel (10) may include a red LED (11), a green LED (12), and a blue LED (13). In other words, the red LED (11), the green LED (12), and the blue LED (13) may be installed on the upper side of the thin-film transistor (21). The red LED (11) may be formed to emit red light. The green LED (12) may be formed to emit green light. The blue LED (13) may be formed to emit blue light.

[0062] A thin-film transistor (21) can be formed to control a pixel (10). For example, the thin-film transistor (21) can be formed to control the red LED (11), green LED (12), and blue LED (13) of the pixel (10), respectively. When power is applied to the pixel (10) by the thin-film transistor (21), the red LED (11), green LED (12), and blue LED (13) can emit light.

[0063] For example, when power is supplied to the red LED (11) by the thin-film transistor (21), the red LED (11) can emit red light. When power is supplied to the green LED (12) by the thin-film transistor (21), the green LED (12) can emit green light. When power is supplied to the blue LED (13) by the thin-film transistor (21), the blue LED (13) can emit blue light.

[0064] A substrate (20) may be installed on the lower part of the thin-film transistor (21). In other words, the thin-film transistor (21) may be formed on the upper surface of the substrate (20).

[0065] The substrate (20) can be formed from polyimide (PI), polyethylene terephthalate (PET), metal foil, polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), glass, etc.

[0066] In a display module (1) according to one or more embodiments of the present disclosure having the structure as described above, a defect may occur in which one of the red LED (11), green LED (12), and blue LED (13) of the pixel (10) is turned off.

[0067] Due to differences in visual sensitivity among the red LED (11), green LED (12), and blue LED (13), the visibility of the green LED (12) is the best, and the visibility of the blue LED (13) is the worst. The visibility of the red LED (11) is worse than that of the green LED (12) but better than that of the blue LED (13). Therefore, in order to improve the quality of the display module (1) when one of the green LED (12) and the red LED (11) of at least one pixel (10) among the multiple pixels (10) fails to emit light, the pixel (10) with the defect can be repaired so that the pixel (10) can emit green light or red light.

[0068] To this end, a display module (1) according to one or more embodiments of the present disclosure may be repaired to emit red light or green light by installing a light conversion layer (31, 32) on the upper side of a blue LED (13) of a pixel (10) where a red LED (11) or green LED (12) has an off failure.

[0069] The light conversion layer (31, 32) installed on the upper side of the blue LED (13) can be formed from any one of a quantum dot, perovskite, or phosphor.

[0070] Hereinafter, with reference to FIGS. 3 and FIGS. 4, a case in which a red LED (11) fails to emit light in one pixel (10) among a plurality of pixels (10) of a display module (1) according to one or more embodiments of the present disclosure and a state in which such light is repaired will be described in detail.

[0071] FIG. 3 is a cross-sectional view showing a state in which a red LED (11) is not emitting light in a pixel (10) of a display module (1) according to one or more embodiments of the present disclosure.

[0072] Referring to FIG. 3, the blue LED (13) and the green LED (12) of the pixel (10) according to one or more embodiments of the present disclosure emit light, and the red LED (11) does not emit light. In other words, the blue LED (13) emits blue light, and the green LED (12) emits green light. However, the red LED (11) does not emit red light.

[0073] In this case, the visibility of the display module (1) may be reduced because red light, which has greater visual sensitivity than blue light, is not emitted from the pixel (10). To resolve this problem, it can be configured to emit red light using a blue LED (13) as shown in FIG. 4.

[0074] FIG. 4 is a cross-sectional view showing a state in which a pixel (10) that has not emitted light from a red LED (11) of a display module (1) according to one or more embodiments of the present disclosure is repaired.

[0075] Referring to FIG. 4, a light conversion layer (31) may be installed on the upper side of the blue LED (13) of a pixel (10) where the red LED (11) has not emitted light. Then, red light may be emitted from the light conversion layer (31) installed on the upper side of the blue LED (13).

[0076] In this case, the light conversion layer (31) can be formed as a red light conversion layer that converts blue light emitted from the blue LED (13) into red light. Then, the blue light emitted from the blue LED (13) is incident on the red light conversion layer (31), and the incident blue light can be converted into red light and emitted as it passes through the red light conversion layer (31). Therefore, a pixel (10) in which the red LED (11) is off can emit red light using the blue LED (13) and the red light conversion layer (31).

[0077] The red light conversion layer (31) can be formed from any one of a quantum dot, perovskite, or phosphor.

[0078] As shown in FIG. 4, if a red light conversion layer (31) is installed on the upper side of the blue LED (13) of a pixel (10) containing a defective red LED (11), the red LED (11) can be turned off and the pixel (10) that was not emitting red light can emit red light using the blue LED (13), so the visibility of the display module (1) can be improved.

[0079] Hereinafter, with reference to FIGS. 5 and FIGS. 6, a case in which a green LED (12) fails to emit light in a pixel (10) of a display module (1) according to one or more embodiments of the present disclosure and a state in which it has been repaired will be described in detail.

[0080] FIG. 5 is a cross-sectional view showing a state in which a green LED (12) is not emitting light in a pixel (10) of a display module (1) according to one or more embodiments of the present disclosure.

[0081] Referring to FIG. 5, the blue LED (13) and the red LED (11) of the pixel (10) according to one or more embodiments of the present disclosure emit light, and the green LED (12) does not emit light. In other words, the blue LED (13) emits blue light, and the red LED (11) emits red light. However, the green LED (12) does not emit green light.

[0082] In this case, the visibility of the display module (1) may be reduced because the green light with the greatest visual sensitivity is not emitted from the pixel (10). To resolve this problem, it can be configured to emit green light using a blue LED (13) as shown in FIG. 6.

[0083] FIG. 6 is a cross-sectional view showing a state in which a pixel (10) that has not emitted light from a green LED (12) of a display module (1) according to one or more embodiments of the present disclosure is repaired.

[0084] Referring to FIG. 6, a light conversion layer (32) may be installed above the blue LED (13) of a pixel (10) where the green LED (12) has not emitted light. Then, green light may be emitted from the light conversion layer (32) installed above the blue LED (13).

[0085] In this case, the light conversion layer (32) can be formed as a green light conversion layer that converts blue light emitted from the blue LED (13) into green light. Then, the blue light emitted from the blue LED (13) is incident on the green light conversion layer (32), and the incident blue light can be converted into green light and emitted as it passes through the green light conversion layer (32). Therefore, a pixel (10) with a defect in the green LED (12) can emit green light using the blue LED (13) and the green light conversion layer (32).

[0086] The green light conversion layer (32) can be formed from any one of a quantum dot, perovskite, or phosphor. The composition and / or structure of the green light conversion layer (32) that converts blue light into green light may differ from the red light conversion layer (31) that converts blue light into red light.

[0087] As shown in FIG. 6, if a green light conversion layer (32) is installed on the upper side of the blue LED (13) of a pixel (10) containing a defective green LED (12), the pixel (10) that was not emitting green light when the green LED (12) was turned off can emit green light using the blue LED (13), so the visibility of the display module (1) can be improved.

[0088] In the above description, a case in which mixed light is not emitted from the light conversion layer (31, 32) by using a light conversion layer (31, 32) having a high absorption rate of blue light has been described, but the present disclosure is not limited thereto. As another example, a defective pixel (10) can be repaired by using a light conversion layer (31, 32) that does not have a high absorption rate of blue light.

[0089] Hereinafter, a repaired display module (1) using a light conversion layer (31, 32) that does not have a high absorption rate of blue light will be described in detail with reference to FIGS. 7 and FIGS. 8.

[0090] FIG. 7 is a cross-sectional view showing a state in which a pixel (10) that has not emitted light from a red LED (11) of a display module (1) according to one or more embodiments of the present disclosure is repaired.

[0091] Referring to FIG. 7, a light conversion layer (31) and a blue-cut layer (40) may be laminated and installed on the upper side of a blue LED (13) of a pixel (10) where the red LED (11) has not emitted light. For example, the light conversion layer (31) may be installed on the upper side of the blue LED (13), and the blue-cut layer (40) may be installed on the upper surface of the light conversion layer (31). Then, red light may be emitted from the blue-cut layer (40) installed on the upper side of the blue LED (13).

[0092] In this case, the light conversion layer (31) can be formed as a red light conversion layer that converts blue light emitted from the blue LED (13) into red light. Then, the blue light emitted from the blue LED (13) is incident on the red light conversion layer (31), and the incident blue light can be converted into red light and emitted as it passes through the red light conversion layer (31).

[0093] However, since the red light conversion layer (31) does not have a high absorption rate of blue light, it cannot convert all of the incident blue light into red light, and some of the blue light may pass through the red light conversion layer (31). For example, if the blue light absorption rate of the red light conversion layer (31) is about 90% or less, some of the incident blue light may pass through the red light conversion layer (31).

[0094] In this way, if the red light conversion layer (31) does not absorb more than 90% of the blue light emitted from the blue LED (13), mixed light in which red light and blue light are mixed may be emitted from the red light conversion layer (31). If mixed light is emitted from the pixel (10), the visibility of the display module (1) may be reduced.

[0095] To resolve this, a blue light blocking layer (40) may be installed on the upper side of the red light conversion layer (31). The blue light blocking layer (40) may be formed to allow red light to pass through while blocking blue light.

[0096] If a blue light blocking layer (40) is installed on the upper side of the red light conversion layer (31), the blue light that has passed through the red light conversion layer (31), which has a low absorption rate of blue light, is blocked by the blue light blocking layer (40) and only red light passes through, so only red light can be emitted from the blue light blocking layer (40).

[0097] As illustrated in FIG. 7, if a red light conversion layer (31) with a low blue light absorption rate and a blue light blocking layer (40) are stacked sequentially on the upper side of a blue LED (13) of a pixel (10) containing a defective red LED (11), the red LED (11) cannot emit light and thus the pixel (10) that does not emit red light can emit red light using the blue LED (13), thereby improving the visibility of the display module (1).

[0098] FIG. 8 is a cross-sectional view showing a state in which a pixel (10) that has not emitted light from a green LED (12) of a display module (1) according to one or more embodiments of the present disclosure is repaired.

[0099] Referring to FIG. 8, a light conversion layer (32) and a blue light blocking layer (40) may be installed by stacking them on the upper side of the blue LED (13) of a pixel (10) where the green LED (12) has not emitted light. For example, the light conversion layer (32) may be installed on the upper side of the blue LED (13), and the blue light blocking layer (40) may be installed on the upper surface of the light conversion layer (32). Then, green light may be emitted from the blue light blocking layer (40) installed on the upper side of the blue LED (13).

[0100] In this case, the light conversion layer (32) can be formed as a green light conversion layer (32) that converts blue light emitted from the blue LED (13) into green light. Then, the blue light emitted from the blue LED (13) is incident on the green light conversion layer (32), and the incident blue light can be converted into green light and emitted as it passes through the green light conversion layer (32).

[0101] However, since the green light conversion layer (32) does not have a high absorption rate of blue light, it cannot convert all of the incident blue light into green light, and some of the blue light may pass through the green light conversion layer (32). For example, if the blue light absorption rate of the green light conversion layer (32) is about 90% or less, some of the incident blue light may pass through the green light conversion layer (32).

[0102] In this way, if the green light conversion layer (32) does not absorb more than 90% of the blue light emitted from the blue LED (13), mixed light in which green light and blue light are mixed may be emitted from the green light conversion layer (32). If mixed light is emitted from the pixel (10), the visibility of the display module (1) may be reduced.

[0103] To resolve this, a blue light blocking layer (40) may be installed on the upper side of the green light conversion layer (32). The blue light blocking layer (40) may be formed to allow green light to pass through while blocking blue light.

[0104] If a blue light blocking layer (40) is installed on the upper side of the green light conversion layer (32), the blue light that has passed through the green light conversion layer (32), which has a low absorption rate of blue light, is blocked by the blue light blocking layer (40) and only green light passes through, so only green light can be emitted from the blue light blocking layer (40).

[0105] As illustrated in FIG. 8, if a green light conversion layer (32) with a low blue light absorption rate and a blue light blocking layer (40) are stacked sequentially on the upper side of a blue LED (13) of a pixel (10) containing a defective green LED (12), the pixel (10) that does not emit green light because the green LED (12) cannot emit light can emit green light using the blue LED (13), thereby improving the visibility of the display module (1).

[0106] According to a display module (1) according to one or more embodiments of the present disclosure having a structure as described above, if a defect in the green LED (12) or the red LED (11) occurs in at least one pixel (10) among a plurality of pixels (10) of the display module (1), the pixel (10) can be repaired without removing the green LED (12) or the red LED (11) using a laser and reattaching a new LED. Accordingly, defects in the green LED (12) and the red LED (11) of the display module (1) can be reduced or minimized. As a result, the visibility of the display module (1) according to one or more embodiments of the present disclosure can be improved.

[0107] Hereinafter, a repair method for a display module (1) according to one or more embodiments of the present disclosure will be described in detail with reference to FIGS. 9 to 12d.

[0108] Referring to FIGS. 9 to 10c, a repair method for a display module (1) according to one or more embodiments of the present disclosure, in which a protective layer is not present on the upper side of a plurality of pixels (10), will be described.

[0109] FIG. 9 is a flowchart for explaining a repair method of a display module (1) according to one or more embodiments of the present disclosure. FIG. 10a, FIG. 10b, and FIG. 10c are drawings illustrating a repair method of a display module (1) according to one or more embodiments of the present disclosure.

[0110] First, among the multiple pixels (10) of the display module (1), a pixel (10) in which the red LED (11) or the green LED (12) does not emit light can be found (S91). Here, the red LED (11) not emitting light refers to the case where the red LED (11) does not emit red light when power is applied to the display module (1). The green LED (12) not emitting light refers to the case where the green LED (12) does not emit green light when power is applied to the display module (1).

[0111] For example, as shown in FIG. 10a, the green LED (12) of the pixel (10) may not emit light. In other words, when power is applied to the display module (1), the red LED (11) emits red light and the blue LED (13) emits blue light. However, the green LED (12) does not emit green light.

[0112] For example, the red LED (11) of the pixel (10) may not emit light. In other words, when power is applied to the display module (1), the green LED (12) emits green light and the blue LED (13) emits blue light. However, the red LED (11) does not emit red light.

[0113] Next, a light conversion layer (31, 32) can be applied to the upper side of the blue LED (13) of the pixel (10) that the red LED (11) or green LED (12) did not emit light (S92).

[0114] For example, if the green LED (12) of the pixel (10) does not emit light and the red LED (11) and blue LED (13) are turned on, a green light conversion layer (32) can be applied to the upper side of the blue LED (13) of the pixel (10) as shown in FIG. 10b.

[0115] For example, if the red LED (11) of the pixel (10) does not emit light and the green LED (12) and blue LED (13) are turned on, a red light conversion layer (31) can be applied to the upper side of the blue LED (13) of the pixel (10).

[0116] The light conversion layer (31, 32) can be formed from any one of quantum dots, perovskite, or phosphor.

[0117] The light conversion layer (31, 32) can be applied to the upper side of the blue LED (13) using ink-jet printing or electrohydrodynamic (EHD) printing.

[0118] Next, the light conversion layer (31, 32) can be cured (S93).

[0119] Finally, as illustrated in FIG. 10c, a protective layer (50) can be formed on the upper side of a plurality of pixels (10) of the display module (1) (S94). For example, the protective layer (50) can be formed from a protective film or a protective molding.

[0120] According to one or more embodiments, if the blue light absorption rate of the light conversion layer (31, 32) is not high, a blue light blocking layer (40) can be applied to the upper side of the light conversion layer (31, 32). For example, after curing the light conversion layer (31, 32) applied to the upper side of the blue LED (13), a blue light blocking layer (40) can be applied to the upper side of the light conversion layer (31, 32). After that, the blue light blocking layer (40) can be cured. Once the curing of the blue light blocking layer (40) is complete, a protective layer (50) can be formed on the upper side of a plurality of pixels (10).

[0121] Referring to FIGS. 11 to 12d, a repair method for a display module (1) according to one or more embodiments of the present disclosure, in which a protective layer (50) is formed on the upper side of a plurality of pixels (10), is described.

[0122] FIG. 11 is a flowchart for explaining a repair method of a display module (1) according to one or more embodiments of the present disclosure. FIG. 12a, FIG. 12b, FIG. 12c, and FIG. 12d are drawings for explaining a repair method of a display module (1) according to one or more embodiments of the present disclosure.

[0123] First, among the multiple pixels (10) of the display module (1), a pixel (10) in which the red LED (11) or the green LED (12) does not emit light can be found (S111). Here, the red LED (11) not emitting light refers to the case where the red LED (11) does not emit red light when power is applied to the display module (1). The green LED (12) not emitting light refers to the case where the green LED (12) does not emit green light when power is applied to the display module (1).

[0124] For example, as shown in FIG. 12a, the green LED (12) of the pixel (10) covered by the protective layer (50) may not emit light. In other words, when power is applied to the display module (1), the red LED (11) emits red light and the blue LED (13) emits blue light. However, the green LED (12) does not emit green light.

[0125] For example, the red LED (11) of the pixel (10) may not emit light. In other words, when power is applied to the display module (1), the green LED (12) emits green light and the blue LED (13) emits blue light. However, the red LED (11) does not emit red light.

[0126] Next, as shown in 12b, the protective layer (50) above the blue LED (13) of the corresponding pixel (10), i.e., the red LED (11) or green LED (12) that did not emit light, can be locally removed (e.g., peel-off) (S112). In other words, the original protective layer (50) above the blue LED (13) can be removed to form a repair space (51) in which the blue LED (13) is exposed.

[0127] Next, a light conversion layer (31, 32) can be applied to the upper side of the blue LED (13) of the pixel (10) that did not emit light from the red LED (11) or green LED (12) (S113).

[0128] For example, when the green LED (12) of the pixel (10) is not emitting light and the red LED (11) and blue LED (13) are turned on, a green light conversion layer (32) can be applied to the upper side of the blue LED (13) of the pixel (10) through the repair space (51), as shown in FIG. 12c.

[0129] For example, if the red LED (11) of the pixel (10) does not emit light and the green LED (12) and blue LED (13) are turned on, a red light conversion layer (31) can be applied to the upper side of the blue LED (13) of the pixel (10).

[0130] The light conversion layer (31, 32) can be formed from any one of quantum dots, perovskite, or phosphor.

[0131] The light conversion layer (31, 32) can be applied to the upper side of the blue LED (13) using ink-jet printing or electrohydrodynamic (EHD) printing.

[0132] Next, the light conversion layer (31, 32) can be cured (S114).

[0133] Finally, as illustrated in FIG. 12d, a protective layer (50') can be filled on the upper side of the blue LED (13) of the corresponding pixel (10) (S115). In other words, the protective layer (50') can be filled in the portion where the original protective layer (50) was removed from the upper side of the light conversion layer (31, 32) formed on the upper side of the blue LED (13) of the corresponding pixel (10), i.e., the repair space (51).

[0134] According to one or more embodiments, if the blue light absorption rate of the light conversion layer (31, 32) is not high, a blue light blocking layer (40) can be applied to the upper side of the light conversion layer (31, 32). For example, after curing the light conversion layer (31, 32) applied to the upper side of the blue LED (13) of the corresponding pixel (10), a blue light blocking layer (40) can be applied to the upper side of the light conversion layer (31, 32). After that, the blue light blocking layer (40) can be cured. Once the curing of the blue light blocking layer (40) is complete, a protective layer (50') can be filled into the repair space (51) above the blue LED (13) of the corresponding pixel (10).

[0135] According to the repair method of a display module (1) according to one or more embodiments of the present disclosure described above, when a defect in the green LED (12) or the red LED (11) occurs in at least one pixel (10) among a plurality of pixels (10) of the display module (1), a light conversion layer (31, 32) is applied to the upper side of the blue LED (13) of the corresponding pixel (10) so that the corresponding pixel (10) emits green light or red light that was not previously emitted. Accordingly, the repair method of a display module (1) according to one or more embodiments of the present disclosure can repair the pixel (10) without removing the green LED (12) or the red LED (11) using a laser and without reattaching a new LED. Accordingly, defects in the green LED (12) and the red LED (11) of the display module (1) can be reduced or minimized. As a result, according to the repair method of the display module (1) according to one or more embodiments of the present disclosure, the visibility of the display module (1) can be improved.

[0136] Although the above description describes a case where each of the plurality of pixels (10) of the display module (1) includes a red LED (11), a green LED (12), and a blue LED (13), the present disclosure is not limited thereto. Each of the plurality of pixels (10) of the display module (1) may be formed to include a red micro LED, a green micro LED, and a blue micro LED.

[0137] Although the present disclosure has been illustrated and described above with reference to various embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the scope of the present disclosure as defined by the appended claims and equivalents.

Claims

1. A substrate on which a plurality of thin-film transistors are formed; and A plurality of pixels disposed on the plurality of thin-film transistors; comprising, Each of the above plurality of pixels includes a red LED, a green LED, and a blue LED, and A display module in which at least one pixel among the plurality of pixels in which the red LED or the green LED does not emit light includes a light conversion layer provided on the upper side of the blue LED.

2. In Paragraph 1, The green LED of at least one pixel above does not emit light, and The light conversion layer includes a green light conversion layer installed above the blue LED of the at least one pixel, and A display module, wherein the green light conversion layer is formed to convert blue light emitted from the blue LED of at least one pixel into green light.

3. In Paragraph 1, The red LED of at least one pixel above does not emit light, and The light conversion layer includes a red light conversion layer installed above the blue LED of the at least one pixel, and A display module, wherein the above red light conversion layer is formed to convert blue light emitted from the blue LED of the at least one pixel into red light.

4. In Paragraph 1, A display module in which the light conversion layer is formed from any one of a quantum dot, a perovskite, or a phosphor.

5. In Paragraph 1, A display module further comprising a protective layer formed on the upper side of the plurality of pixels.

6. In Paragraph 1, A display module comprising at least one pixel further including a blue light blocking layer formed on the upper side of the light conversion layer.

7. In Paragraph 1, A display module in which the red LED, the green LED, and the blue LED of each of the plurality of pixels are formed as micro LEDs.

8. A method for repairing a display module comprising a plurality of pixels including a red LED, a green LED, and a blue LED, wherein A step of finding a pixel among the plurality of pixels in which the red LED or the green LED did not emit light; A step of applying a light conversion layer formed to emit red light or green light to the upper side of the blue LED of the pixel found above; A step of curing the above light conversion layer; and A method for repairing a display module, comprising the step of forming a protective layer on the portion of the pixel found above.

9. In Paragraph 8, A method for repairing a display module, further comprising the step of locally removing a protective layer provided on the upper side of the blue LED of the pixel found above, after the step of finding a pixel among the plurality of pixels where the red LED or the green LED did not emit light.

10. In Paragraph 8, A method for repairing a display module, comprising the step of curing a light conversion layer, applying a blue light blocking layer that absorbs blue light to the upper surface of the light conversion layer, and further curing the blue light blocking layer.

11. In Paragraph 8, A repair method for a display module, wherein the light conversion layer is applied using ink-jet printing or electrohydrodynamic (EHD) printing.

12. In Paragraph 8, The green LED of the pixel found above is unable to emit light, and The light conversion layer above includes a green light conversion layer formed to convert blue light emitted from the blue LED of the pixel found above into green light. , repair method for display module.

13. In Paragraph 8, The red LED of the pixel found above is unable to emit light, and The light conversion layer described above includes a red light conversion layer formed to convert blue light emitted from the blue LED of the pixel found above into red light. , repair method for display module.

14. In Paragraph 8, A method for repairing a display module, wherein the light conversion layer is formed from any one of a quantum dot, a perovskite, or a phosphor.

15. In Paragraph 8, A repair method for a display module in which each of the plurality of pixels, the red LED, the green LED, and the blue LED are formed as micro LEDs.

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