KR20210136835A - Display module having glass substrate formed side wirings and manufacturing method as the same - Google Patents

Abstract

Disclosed is a display module. The display module of the present invention comprises: a glass substrate; a plurality of light emitting diodes (LED) electrically connected to a thin film transistor (TFT) layer of the glass substrate; a plurality of first connection pads disposed at predetermined intervals on a second edgy zone of the glass substrate and electrically connected to a TFT circuit disposed on the TFT layer through wirings; a plurality of second connection pads disposed at predetermined intervals on a third edgy zone of the glass substrate and electrically connected to a driving circuit through wirings; and a plurality of side wirings completely covering the first connection pads where one end portion of the side wiring corresponds and completely covering the second connection pads where the other end portion thereof corresponds, wherein at least one of the one end portion and the other end portion of the side wiring covers a part of an insulation layer formed on the glass substrate.

Description

DISPLAY MODULE HAVING GLASS SUBSTRATE FORMED SIDE WIRINGS AND MANUFACTURING METHOD AS THE SAME

The present disclosure relates to a display module and a manufacturing method thereof, and more particularly, to a display module in which side wirings are formed in an edge region of a glass substrate, and a manufacturing method thereof.

The self-luminous display device displays an image without a color filter and a backlight, and an inorganic self-luminous LED device that emits light by itself may be used.

The display module expresses various colors while operating in units of pixels or sub-pixels made of LED inorganic light-emitting devices, and the operation of each pixel or sub-pixel is controlled by a TFT (Thin Film Transistor). A plurality of TFTs are arranged on a flexible substrate, a glass substrate or a plastic substrate, which is called a TFT substrate.

Such a TFT substrate is applied to large TVs ranging from small to several tens of inches, such as flexible devices and wearable devices (eg, Wearable Watch), and is utilized as a substrate for driving a display. In order to drive the TFT substrate, it is connected to an external circuit (External IC) or a driver IC capable of applying a current to the TFT substrate. In general, the TFT substrate and each circuit are connected through COG (Chip on Glass) bonding or FOG (Film on Glass) bonding. For this connection, a region having a certain area, ie, a bezel area, must be secured at the edge of the TFT substrate.

Recently, research and development on a bezel-less technology that minimizes the bezel area so as to maximize the active area, which is an area in which an image is displayed in a display panel employing a TFT substrate, is being researched and developed.

An object of the present disclosure is to provide a display module capable of minimizing the disconnection rate of side wiring formed on a glass substrate and a method of manufacturing the same.

Another object of the present disclosure is to provide a display module including a structure capable of protecting side wiring formed on a glass substrate from external impact, and a method for manufacturing the same.

Another object of the present disclosure is to provide a display module in which side wirings can be stably coupled to a glass substrate by maximizing a contact area on the glass substrate.

In order to achieve the above object, the present disclosure provides a TFT (Thin Film Transistor) layer disposed on a front surface and a driving circuit for driving the TFT layer disposed on a rear surface, and a first corresponding to the side surface. a glass substrate including an edge region including one edge zone, a second edge zone corresponding to a portion of the front surface adjacent to the side surface, and a third edge zone corresponding to a portion of the rear surface adjacent to the side surface; a plurality of LEDs (Light Emitting Diodes) electrically connected to the TFT layer of the glass substrate; a plurality of first connection pads disposed at intervals in the second edge zone and electrically connected to a TFT circuit provided in the TFT layer through a plurality of first metal wirings; a plurality of second connection pads disposed at intervals in the third edge zone and electrically connected to the driving circuit through a plurality of second metal wires; and a plurality of side wirings having one end completely covering the corresponding first connection pad and the other end completely covering the corresponding second connection pad, wherein at least one of one end and the other end of the side wiring is the glass substrate To provide a display module covering a portion of the insulating layer formed on the.

The insulating layer may be an organic insulating layer or an inorganic insulating layer formed on the front and back surfaces of the glass substrate.

The insulating layer may be disposed adjacent to the first connection pad or the second connection pad with a gap therebetween.

The insulating layer may cover a portion of the first connection pad or the second connection pad.

The first connection pad may be formed on the first metal wiring, and the second connection pad may be formed on the second metal wiring.

The glass substrate may have concavities and convexities formed in the second edge zone, and one end of the first metal wiring, the first connection pad, and the side wiring sequentially stacked on the concavities and convexities may have an uneven shape.

The first connection pad may have an uneven shape, and one end of the side wiring stacked on the unevenness may have an uneven shape.

The first connection pad may form an unevenness formed by a laser process or an etching process, and the side wiring may be formed on the glass substrate through a metal deposition process, and a portion of the side wiring formed on the unevenness may have an uneven shape. have.

A via structure made of an insulating material may be formed on the first connection pad, and a portion of the side wiring formed on the via structure may have a concave-convex shape and may be electrically connected to the first connection pad.

The glass substrate includes an edge region comprising a first edge zone corresponding to a side surface, a second edge zone corresponding to a portion of the front surface adjacent to the side surface, and a third edge zone corresponding to a portion of the rear surface adjacent to the side surface, The plurality of side wirings are arranged at regular intervals, and each side wiring has a width of a first portion formed in the first edge zone, a width of a second portion formed in the second edge zone, and a width formed in the third edge zone It may be larger than the width of the third portion.

A distance between the first portions of the side interconnections adjacent to each other may be smaller than the respective widths of the second and third portions.

An interval between the first portions of the side wirings adjacent to each other may be smaller than a spacing between the second portions of the side wirings adjacent to each other and a distance between the third portions of the side wirings adjacent to each other.

The first portion of the side wiring gradually extends from the point connected to the second portion to a predetermined distance away from the second portion, and gradually from the point connected to the third portion to a predetermined distance away from the third portion. It may include a section extending to .

The first portion of the side wiring may include a section formed with a constant width between the extended sections on both sides.

The glass substrate may further include a first chamfered surface formed between the first and second edge zones and a second chamfered surface formed between the first and third edge zones.

The side wiring may be formed to extend along the second edge zone, the first chamfered surface, the first edge zone, the second chamfered surface, and the third edge zone.

A trench may be formed in the first edge zone of the glass substrate to increase the in-plane distance between the first portions of the side wirings adjacent to each other.

The glass substrate may further include an insulating member coupled along the trench, and the insulating member may protrude higher than the first portion of the side wiring from a side surface of the glass substrate.

The glass substrate may further include a protective layer covering the entire side surface of the glass substrate.

In addition, according to the present disclosure, a thin film transistor (TFT) layer is disposed on a front surface and a driving circuit for driving the TFT layer is disposed on a rear surface, a first edge zone corresponding to the side surface and the a glass substrate including an edge region including a second edge zone corresponding to a portion of the front surface adjacent to a side surface and a third edge zone corresponding to a portion of the rear surface adjacent to the side surface; a plurality of LEDs (Light Emitting Diodes) electrically connected to the TFT layer of the glass substrate; a plurality of first connection pads disposed at intervals in the second edge zone and electrically connected to a TFT circuit provided in the TFT layer through a plurality of first metal wirings; a plurality of second connection pads disposed at intervals in the third edge zone and electrically connected to the driving circuit through a plurality of second metal wires; and a plurality of side wirings electrically connecting the plurality of first connection pads and the plurality of second connection pads, wherein one side wiring completely covers two or more first connection pads arranged adjacent to each other at one end. A display module in which at least one of one end and the other end of the one side wiring completely covers a portion of the insulating layer formed on the glass substrate By doing so, the above object can be achieved.

In addition, the present disclosure includes the steps of forming a glass substrate provided with a TFT layer on the front surface and including at least one edge region; forming a mask layer formed to cover the front surface and the rear surface of the glass substrate and covering a portion of the front surface and the rear surface of the glass substrate adjacent to the side surface of the glass substrate in a concave-convex shape; forming a thin conductive layer on a side surface of the glass substrate and on an area not covered by the mask layer on the front and rear surfaces of the glass substrate; forming a plurality of side wirings at regular intervals by removing a portion of the thin conductive layer; and removing the mask layer, wherein the width of the first portion of the side wiring formed on the side surface of the glass substrate is greater than the width of the second and third portions of the side wiring formed by the concavo-convex shape of the mask. By providing a method of manufacturing a display module to be formed, it is possible to achieve the above object.

The width of the first portion of the side wiring formed on the side surface of the glass substrate may be determined according to the width of the portion removed from the thin conductive layer.

The thin conductive layer may be deposited on the glass substrate by sputtering, and a portion of the thin conductive layer formed on the side surface of the glass substrate may be removed by laser trimming.

A trench may be formed in a portion from which a portion of the thin conductive layer formed on the side surface of the glass substrate is removed.

The method of manufacturing the display module may further include forming a protective layer covering the entire side surface of the glass substrate.

The method of manufacturing the display module may further include forming an insulating member in the trench, wherein the insulating member may protrude higher than the first portion of the side wiring from a side surface of the glass substrate.

The method of manufacturing the display module may further include forming a protective layer covering the entire side surface of the glass substrate.

The manufacturing method of the display module may include: forming a first chamfered surface by processing an edge formed by meeting a front surface and a side surface of the glass substrate; and forming a second chamfered surface by processing an edge formed by meeting the rear surface and the side surface of the glass substrate.

In addition, the present disclosure includes the steps of: forming a glass substrate having a TFT layer provided on its front surface and including at least one edge region; forming a mask layer formed to cover the front surface and the rear surface of the glass substrate and covering a portion of the front surface and the rear surface of the glass substrate adjacent to the side surface of the glass substrate in a concave-convex shape; forming fine mask lines at intervals on the side surfaces of the glass substrate; forming a thin conductive layer on a side surface of the glass substrate and on an area not covered by the mask layer on the front and rear surfaces of the glass substrate; and removing the mask layer and the fine mask line, wherein the width of the first portion of the side wiring formed on the side surface of the glass substrate is adjusted to the second and third widths of the side wiring formed by the concavo-convex shape of the mask. By providing a method of manufacturing a display module that is formed to be larger than the width of the portion, the above object can be achieved.

A distance between the first portions of the side wirings adjacent to each other may be determined by a width of the fine mask line.

1 is a plan view schematically illustrating a display module according to an embodiment of the present disclosure.
Fig. 2 is a schematic diagram showing pixels arranged in a TFT layer;
3 is a cross-sectional view schematically illustrating a display module according to an embodiment of the present disclosure.
4A is a view illustrating an example in which a plurality of side wirings are formed at intervals along the side surface of the glass substrate according to an embodiment of the present disclosure, and is an enlarged perspective view of a part of the front surface of the glass substrate.
4B is an enlarged perspective view of a portion of the rear surface of the glass substrate shown in FIG. 4A .
5 and 6 are enlarged views illustrating a part of a side wiring formed on a side surface of a glass substrate.
7 is a flowchart schematically illustrating a manufacturing process of a display module according to an embodiment of the present disclosure.
8 is a flowchart illustrating a process of forming a side wiring in an edge region of a glass substrate.
9 to 16 are views sequentially illustrating a process of forming a side wiring.
17 is a perspective view illustrating an example in which an insulating member is coupled to a trench formed on a side surface of a glass substrate.
18 is a plan view illustrating an example in which a protective layer is formed on a side surface of a glass substrate.
19 is a flowchart illustrating another example of a process of forming a side wiring in an edge region of a glass substrate.
20 is a cross-sectional view schematically illustrating an example in which side wiring covers up to a portion of the insulating layer formed on the front and rear surfaces of the glass substrate.
21 is a plan view illustrating an example in which adjacent side wirings respectively cover corresponding connection pads.
22 is a cross-sectional view taken along line AA shown in FIG. 21 .
23 is a plan view illustrating an example in which one side wiring covers a plurality of adjacently arranged connection pads.
24 is a cross-sectional view illustrating an example in which connection pads and side wirings are formed after forming concavities and convexities on a glass substrate.
25 is a cross-sectional view illustrating an example in which a connection pad and a side wiring are formed after irregularities are formed on the metal wiring.
26 is a cross-sectional view illustrating an example in which side wiring is formed after a plurality of grooves are formed in a connection pad.
FIG. 27 is a perspective view illustrating the connection pad shown in FIG. 26;
28 is a perspective view illustrating an example in which a plurality of protrusions are formed on a connection pad.
29 is a cross-sectional view illustrating an example of forming a side wiring after forming a plurality of via holes in an organic insulating layer formed on an upper portion of a connection pad.
30 is a plan view illustrating a welding area irradiated with a laser beam on a side wiring.
Fig. 31 is a plan view showing an example in which a part of the connection pad is covered by the insulating layer and the side wiring covers the connection pad and the edge portion of the insulating layer together.
FIG. 32 is a cross-sectional view taken along line BB shown in FIG. 31 .

Hereinafter, various embodiments will be described in more detail with reference to the accompanying drawings. The embodiments described herein may be variously modified. Certain embodiments may be depicted in the drawings and described in detail in the detailed description. However, the specific embodiments disclosed in the accompanying drawings are only provided to facilitate understanding of the various embodiments. Therefore, the technical spirit is not limited by the specific embodiments disclosed in the accompanying drawings, and it should be understood to include all equivalents or substitutes included in the spirit and scope of the invention.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but these elements are not limited by the above-described terms. The above terminology is used only for the purpose of distinguishing one component from another component.

In this specification, terms such as "comprises" or "have" are intended to designate that the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification exist, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof. When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is mentioned that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

In the present disclosure, the expression 'the same' means not only to completely match, but also includes differences in a degree taking into account the processing error range.

In addition, in describing the present disclosure, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present disclosure, the detailed description thereof will be abbreviated or omitted.

In the present disclosure, the display module may be a micro light emitting diode (microLED or μLED) display panel. The display module is one of the flat panel display panels and is composed of a plurality of inorganic light emitting diodes (inorganic LEDs), each of which is less than 100 micrometers. Compared to liquid crystal display (LCD) panels that require backlighting, microLED display modules offer better contrast, response time and energy efficiency. Both organic light emitting diodes (organic LEDs) and micro LEDs, which are inorganic light emitting devices, have high energy efficiency, but micro LEDs have longer brightness, luminous efficiency, and longer lifespan than OLEDs. A micro LED may be a semiconductor chip that can emit light by itself when power is supplied. Micro LED has fast response speed, low power, and high luminance. Specifically, the micro LED has a higher efficiency of converting electricity into photons than a conventional liquid crystal display (LCD) or organic light emitting diode (OLED). In other words, it has a higher “brightness per watt” compared to traditional LCD or OLED displays. Accordingly, the micro LED can produce the same brightness with about half the energy of conventional LEDs (each exceeding 100 μm in width, length, and height) or OLED. In addition, micro LED can realize high resolution, excellent color, contrast and brightness, so it can accurately express a wide range of colors, and can realize a clear screen even outdoors in bright sunlight. In addition, the micro LED is strong against burn-in and has low heat generation, so a long lifespan is guaranteed without deformation.

In the present disclosure, the micro LED may have a flip chip structure in which an anode and a cathode electrode are formed on the same first surface and a light emitting surface is formed on a second surface opposite to the first surface on which the electrodes are formed. .

In the present disclosure, a TFT layer having a TFT (Thin Film Transistor) circuit formed on the front surface of the glass substrate may be disposed, and a driving circuit for driving the TFT circuit may be disposed on the rear surface of the glass substrate. The TFT circuitry may drive a number of pixels disposed in the TFT layer.

In the present disclosure, the front surface of the glass substrate may be divided into an active area and an inactive area. The active region may correspond to a region occupied by the TFT layer on the front surface of the glass substrate, and the inactive region may be a region excluding the region occupied by the TFT layer on the front surface of the glass substrate.

In the present disclosure, the edge region of the glass substrate may be the outermost portion of the glass substrate. Also, the edge region of the glass substrate may be a region remaining except for a region in which a circuit of the glass substrate is formed. Also, the edge region of the glass substrate may include a side surface of the glass substrate, a front portion of the glass substrate adjacent to the side surface, and a portion of the rear surface of the glass substrate. The glass substrate may be formed in a quadrangle type. Specifically, the glass substrate may be formed in a rectangular shape or a square shape. The edge region of the glass substrate may include at least one side of the four sides of the glass substrate.

In the present disclosure, a plurality of side wirings may be formed at regular intervals in the edge region of the glass substrate. The plurality of side wirings may have one end electrically connected to the plurality of first connection pads formed in the edge region included in the front surface of the glass substrate, and the other ends of the plurality of second connection pads formed in the edge region included in the rear surface of the glass substrate. It may be electrically connected to the pad. The plurality of first connection pads may be connected to the TFT circuit disposed on the front surface of the glass substrate through wirings, and the plurality of second connection pads may be connected to the driving circuit disposed on the rear surface of the glass substrate through wirings.

In the present disclosure, the display module can be bezel-less by minimizing the inactive area and maximizing the active area on the front surface of the TFT substrate by forming a plurality of side wirings, and the mounting density of the micro LED for the display module can be increased. have. In this way, the display module implementing the bezel-less reduction can provide a large display (LFD) device capable of maximizing an active area when a plurality of them are connected. In this case, each display module may be formed to maintain a pitch between pixels of an adjacent display module to be the same as a pitch between pixels in a single display module by minimizing an inactive area. Accordingly, it is possible to prevent a seam from appearing in the connection portion between each display module.

In the present disclosure, an edge in an edge region included in the inactive region of the glass substrate may be chamfered to form a chamfered surface having a predetermined angle. The chamfered surface may be formed at an edge between the front surface and the side surface of the glass substrate and at an edge between the rear surface and the side surface of the glass substrate. When forming the side wiring by laser processing, such a chamfer surface makes the laser beam irradiation section a predetermined distance away from the front and rear surfaces of the glass substrate so that various devices or circuits mounted on the front and rear surfaces of the glass substrate can be applied to the laser beam. damage can be prevented.

In the present disclosure, it is described that a plurality of side wirings are formed only in two of the four sides of the edge region provided on the glass substrate, but the present disclosure is not limited and a plurality of side wirings are formed only in one of the four sides if necessary. It may be formed in three or more places.

In the present disclosure, the display module includes a glass substrate on which a plurality of LEDs are mounted and side wiring is formed. Such a display module can be installed and applied in electronic products or electric fields that require a wearable device, a portable device, a handheld device, and various displays as a single unit, and a plurality of matrix types Through the assembly arrangement of the PC (personal computer) monitor, high-resolution TV and signage (or digital signage), it can be applied to display devices such as electronic display (electronic display).

Hereinafter, a display module including a glass substrate on which a side wiring is formed according to an embodiment of the present disclosure will be described with reference to the drawings.

1 is a plan view schematically showing a display module according to an embodiment of the present disclosure, FIG. 2 is a schematic diagram showing pixels arranged on a TFT layer, and FIG. 3 is a schematic view of a display module according to an embodiment of the present disclosure It is a cross-sectional view indicated by

1 to 3 , the display module 1 according to the present disclosure may include a TFT substrate 11 .

The display module 1 may include a plurality of micro LEDs 20 arranged on a TFT substrate 11 . The plurality of micro LEDs may be sub-pixels constituting a single pixel. In the present disclosure, micro LED and sub-pixel are used as the same meaning.

The TFT substrate 11 includes a glass substrate 12, a TFT layer 13 including a TFT (Thin Film Transistor) circuit on the entire surface of the glass substrate 12, a TFT circuit of the TFT layer 13 and a glass substrate ( 12) may include a plurality of side wirings 30 for electrically connecting circuits (not shown) disposed on the rear surface. The TFT substrate 11 includes an active area 11a for expressing an image and a dummy area 11b for expressing an image on the entire surface.

The active region 11a may be divided into a plurality of pixel regions 13 in which a plurality of pixels are respectively arranged. The plurality of pixel areas 13 may be partitioned in various shapes, and may be partitioned in a matrix shape, for example. Each pixel region 13 may include a sub-pixel region 15 in which multi-color micro LEDs, which are a plurality of sub-pixels, are mounted, and a pixel circuit region 16 for driving each sub-pixel.

A plurality of micro LEDs 20 are transferred to the pixel circuit region 16 of the TFT layer 11b, and electrode pads of each micro LED are electrically connected to the electrode pads 17a and 17b formed in the TFT layer 11b, respectively. can be connected The common electrode pad 17b may be formed in a straight line in consideration of the arrangement of the three micro LEDs 20 arranged side by side.

A pixel driving method of the display module 1 according to an embodiment of the present disclosure may be an AM (Active Matrix) driving method or a PM (Passive Matrix) driving method. The display module 1 may form a wiring pattern to which each micro LED is electrically connected according to an AM driving method or a PM driving method.

The inactive area 11b may be included in an edge area of the glass substrate 12 , and a plurality of first connection pads 18a may be disposed at regular intervals. Each of the plurality of first connection pads 18a may be electrically connected to each sub-pixel through a wiring 18b.

The number of first connection pads 18a formed in the non-active region 11b may vary depending on the number of pixels implemented on the glass substrate, and may vary depending on a driving method of the TFT circuit disposed in the active region 11a. . For example, compared to the case of a passive matrix (PM) driving method in which a TFT circuit disposed in the active region 11a drives a plurality of pixels in a horizontal line and a vertical line, an AM (Active Matrix) driving each pixel individually The drive method may require more wiring and connection pads.

In FIG. 3 , only two sub-pixels of the micro LEDs 20 that are three sub-pixels included in a unit pixel are displayed for convenience.

In the display module 1, a plurality of micro LEDs 20 may be partitioned by a black matrix 41, respectively, and a transparent cover layer 43 for protecting the plurality of micro LEDs 20 and the black matrix 41 together. ) can be provided. In this case, a touch screen panel (not shown) may be stacked on one surface of the transparent cover layer 36 .

The plurality of micro LEDs 20 may be made of an inorganic light emitting material and may be a semiconductor chip capable of emitting light by itself when power is supplied.

The plurality of micro LEDs 20 may have a predetermined thickness and may be formed in a square having the same width and length, or a rectangle having different widths and lengths. Such a micro LED can realize Real HDR (High Dynamic Range), improve luminance and black expression, and provide a high contrast ratio compared to OLED. The size of the micro LED may be 100 μm or less, or preferably 30 μm or less.

The plurality of micro LEDs 20 may have a flip chip structure in which an anode and a cathode electrode are formed on the same surface and a light emitting surface is formed opposite to the electrodes.

4A is a partially enlarged perspective view illustrating an example in which a plurality of side wirings are formed at intervals along the side surface of the TFT substrate according to an embodiment of the present disclosure, and FIG. 4B is a partially enlarged view showing the rear surface of the TFT substrate shown in FIG. 4A. is a perspective view.

4A and 4B , in the present disclosure, the edge region of the glass substrate 12 may be defined as including a plurality of edge zones positioned on each side of the glass substrate 12 .

Specifically, a first edge zone corresponding to the entire side surface SS of the glass substrate 12 and a portion corresponding to a front surface FS of the glass substrate adjacent to the side surface SS of the glass substrate 12 . It may include a second edge zone and a third edge zone corresponding to a portion of a rear surface (RF) of the glass substrate 12 adjacent to the side surface SS of the glass substrate 12 .

In this case, the second edge zone may include a first chamfered surface CS1 chamfered between the side surface SS and the front surface FS of the glass substrate, and the third edge zone is the side surface SS of the glass substrate. A chamfered second chamfered surface CS2 may be included between the rear surface RS and the rear surface RS.

The side wiring 30 may electrically connect the first connection pad 18a formed in the second edge zone and the second connection pad 19a formed in the third edge zone.

A plurality of first connection pads 18a may be formed at regular intervals along the second edge zone. A portion of the first connection pad 18a may be electrically connected through a wiring 18b provided in the TFT layer 13 . In this case, the wiring 18b may be a gate signal wiring or a data signal wiring of the TFT layer 13 .

A plurality of second connection pads 19a may be formed at regular intervals along the third edge zone. The second connection pad 19a is connected to the first connection pad 18a through the side wiring 30, and the driving circuit formed on the rear surface RS of the glass substrate through the wiring 19b and the wiring 19b. can be connected

The side wiring 30 may have one end electrically connected to the first connection pad 18a and the other end electrically connected to the second connection pad 19a.

The side wiring 30 may include a first portion 31 formed in the first edge zone, a second portion 32 formed in the second edge zone, and a third portion 33 formed in the third edge zone. . The first, second and third portions 31 , 32 , 33 are continuously formed.

The side wiring 30 having a fine width may be disconnected by an external impact when processing or transporting the glass substrate 12 . In particular, the first portion 31 of the side wiring formed in the first edge zone may be easily disconnected if it is scratched or dented when it collides with a surrounding structure (eg, equipment used in a process, etc.).

In order to prevent this, it is preferable that the width W1 of the first portion 31 of the side wiring is formed as wide as possible. In this case, it is preferable that the side wiring 30 maintain a gap G1 to the extent that it is not shorted with the first portion of the other adjacent side wiring.

The widths of the second and third portions 32 and 33 of the side wiring may be equal to each other, and the same reference number W2 is assigned. Here, the fact that the widths W2 of the second and third portions 32 and 33 are the same takes into account the processing error range that occurs during processing of the side wiring and is not interpreted only as meaning that they are completely identical.

The first portion 31 of the side wiring may be formed to be larger than the width W2 of the second and third portions 32 and 33 of the side wiring.

In addition, the first interval G1 between the first portions 31 of the adjacent side wiring is smaller than the second interval G2 between the second portions 32 of the adjacent side wiring, and the third portion of the side wiring ( 32) is smaller than the third interval G3 between them. Meanwhile, the width W1 of the first portion 31 of the side wiring may satisfy Equation 1 below.

(Equation 1)

W1=W2+G2-G1

In this case, the width W1 of the first portion 31 of the side wiring may be within the range of Equation 2 below.

(Equation 2)

W2+G2-G1 _max ≤ W1< W2+G2-G1 _min

_{Here, G1 max} which is the maximum value of G1 _{and G1 min which} is the minimum value of G1 may correspond to each example shown in Table 1 below. However, Table 1 shows some examples of the range of G1, and the range of G1 is not necessarily limited to Table 1.

Range of G1 Example 1 0 < G1 ≤ 5 Example 2 5 < G1 ≤ 10 Example 3 10 < G1 ≤ 20 Example 4 20 < G1 ≤ 50 Example 5 50 < G1 ≤ 100

In addition, the width W1 of the first portion 31 of the side wiring may satisfy Equation 3 below, and the range of the width W1 of the first portion 31 of the side wiring may satisfy Equation 4 below have.

(Equation 3)

W1=W2+G3-G1

(Equation 4)

W2+G3-G1 _max ≤ W1< W2+G3-G1 _min

5 and 6 are enlarged views illustrating a part of a side wiring formed on a side surface of a glass substrate.

Referring to FIG. 5 , the first part 31 of the side wiring gradually forms an arc shape 31a from a point connected to the second part 32 to a predetermined distance d1 away from the second part 32 . It may include an extended section. Similarly, the first portion 31 of the side wiring may include a section that gradually expands while forming an arc shape from a point connected to the third portion 33 to a predetermined distance away from the third portion 33 . In this case, the first part 31 may include a section formed with a constant width between the extended sections on both sides.

The first portion 31 of the side wiring may be formed when the arc shape 31a covers a portion of the side surface SS of the glass substrate in a masking process of forming a mask 70 on the glass substrate 12 to be described later.

The arc shape 31a of the first part 31 of the side wiring does not penetrate to the first chamfered surface CS1 when the side wiring is formed by laser processing to be described later. It can be induced to be processed only in . Accordingly, various problems that may occur as the laser beam is reflected to the surrounding structures on the first chamfered surface CS1 of the glass substrate during laser processing can be prevented in advance.

Referring to FIG. 6 , the first part 31 of the side wiring gradually forms a straight shape 31b from a point connected to the second part 32 to a predetermined distance d2 away from the second part 32 . may be expanded.

Hereinafter, a manufacturing process of a display module according to an embodiment of the present disclosure will be schematically described with reference to the drawings.

7 is a flowchart schematically illustrating a manufacturing process of a display module according to an embodiment of the present disclosure.

First, a TFT layer 13 is formed on a glass substrate 12 to manufacture a TFT substrate (S1). The TFT layer 13 may be any one of a low temperature poly silicon (LTPS) TFT, a-Si TFT, and oxide TFT. In this case, the TFT layer 13 may be integrally formed on one surface of the glass substrate 12 .

Meanwhile, the TFT layer 13 may be manufactured separately from the glass substrate 12 in the form of a thin film and firmly attached to one surface of the glass substrate 12 through a coating process such as lamination.

An edge region in which a side wiring is to be formed on the glass substrate 12 is ground and planarized (S2). This is to enable the side wiring formed in the edge region of the glass substrate to be firmly formed without being separated from the glass substrate 12 .

In the planarization process, in the edge region of the glass substrate 12 , the first and second chamfered surfaces ( CS1, CS2).

The first and second chamfered surfaces CS1 and CS2 are separated by a predetermined distance from the front surface FS and the rear surface RS of the glass substrate so that the laser beam irradiation section is spaced apart when the side wiring is formed by laser processing. Various devices or circuits mounted on the front (FS) and rear (RS) of the device can be prevented from being damaged by the laser beam.

A side wiring 30 is formed in an edge region of the glass substrate 12 . The side wiring 30 may be formed by various methods. For example, the side wiring 30 may be formed by applying a conductive metal material to the edge region of the glass substrate through an ink jet method, a stamping method, a screen printing method, a spray method, or a metal deposition method by sputtering.

In this case, the side wiring 30 is formed in the same shape at regular intervals in the edge region of the glass substrate. In the side wiring 30 , the first portion 31 formed in the first edge zone may be formed to have a wider width than the second and third portions 32 and 33 formed in the second and third edge zones.

After forming the side wiring in the edge region of the glass substrate, a plurality of micro LEDs arranged on the transfer substrate are transferred to the TFT layer of the TFT substrate, which is the target substrate (S4).

The display module 1 according to an embodiment of the present disclosure may be manufactured through the above process. Hereinafter, a method of forming the side wiring in the edge region of the glass substrate will be sequentially described.

8 is a flowchart illustrating a process of forming a side wiring in an edge region of a glass substrate, and FIGS. 9 to 16 are views sequentially illustrating each process of forming a side wiring.

Referring to FIG. 9 , a glass substrate 12 in which edge regions (first, second, and third edge zones) are planarized is prepared.

Next, as shown in FIG. 10 , a mask layer 70 covering the front surface FS and the rear surface RS of the glass substrate 12 except for the portion where the side wiring 30 is to be formed in the edge region of the glass substrate 12 is formed. to form (S11).

The mask layer 70 may include a plurality of protrusions 73 protruding from the front surface FS of the glass substrate to the first chamber surface CS1 . In this case, each protrusion 73 may include an end 74 extending by a predetermined distance to a part of the side surface SS of the glass substrate.

Also, the concave portion 75 between the plurality of protrusions 73 covers a part of the first connection pad 18a. In this case, the remaining portion of the first connection pad 18a that is not covered by the concave portion 75 may be physically and electrically connected to the thin conductive layer 80 while being covered by the thin conductive layer 80 . Similarly to the first connection pad 18a, the second connection pad 19a is also covered by the thin film conductive layer 80 while the remaining portion of the second connection pad 19a not covered by the concave portion 75 is covered with a thin film conductive layer. It may be physically and electrically connected to the layer 80 .

The plurality of protrusions 73 are disposed at a predetermined interval G3 in consideration of the width W2 (refer to FIG. 4 ) of the second portion 32 of the side wiring to be formed later. That is, the interval G3 between the respective protrusions 73 is equal to the width W2 of the second portion 32 of each side wiring.

The mask layer 70 may be formed through any one of a screen printing process, a taping process, and an exposure/development process.

For example, when the mask layer 70 is formed by a screen printing process, the screen 60 is disposed on the front surface FS of the glass substrate 12 at a predetermined interval as shown in FIG. 11 .

Next, after applying a paste as a material of the mask layer 70 on the screen 60, a squeeze 67 is applied to the front surface of the glass substrate from a position slightly deviated from the side surface SS of the glass substrate. FS) side, the paste passes through the pattern 61 formed on the screen 60 and the mask layer 70 is printed on the glass substrate 12 disposed below the screen 60 .

After the mask layer 70 is formed on the front surface FS of the glass substrate, the mask layer 70 is also formed on the rear surface SS of the glass substrate through the same screen printing process.

Referring to FIG. 12 , the pattern 61 formed on the screen 60 includes a plurality of concavo-convex patterns 63 to form the plurality of protrusions 73 of the mask layer 70 . In the plurality of concave-convex patterns 63, protrusions and concavities are alternately and repeatedly formed.

When the screen 60 is spaced apart from the front surface of the glass substrate by a predetermined interval, the tip 64 of the protrusion of the plurality of concavo-convex patterns 63 is approximately disposed at a position corresponding to the side surface SS of the glass substrate, The tip 65 of the concave portion may be disposed on the first connection pad 18a. A plurality of protrusions 73 of the mask layer may be formed by a plurality of concavo-convex patterns 63 in the first edge zone of the edge region of the glass substrate 12 .

The remaining area on the front surface FS of the glass substrate except for the first edge zone may be entirely or partially covered by the mask layer 70 depending on the size of the pattern 61 . In this case, the width of the mask layer 70 covering the front and rear surfaces of the glass substrate may vary depending on the post process. For example, when a conductive thin film is deposited such as sputtering to form the side wiring after forming the mask layer 70, only the area for forming the side wiring is left and the front surface (FS) and the rear surface (RS) of the glass substrate It is preferable to cover the whole with the mask layer 70 . Alternatively, when the post process is performed by one of the ink jet method, the stamping method, and the screen printing method, the mask layer 70 may be formed from the front surface FS and the rear surface RS of the glass substrate to an area adjacent to the first edge zone. .

When the mask layer 70 is formed on the front surface FS and the rear surface RS of the glass substrate, the front ends 74 of the plurality of protrusions 73 of the mask layer 70 pass to the side surface SS of the glass substrate. can be formed. This may prevent damage that may be applied to the front surface FS and the rear surface RS of the glass substrate during processing of the thin conductive layer 90 of the side surface SS of the glass substrate. In addition, there is an advantage in that the laser trimming time and man-hours can be shortened by reducing the laser trimming processing area to be described later.

Referring to FIG. 13 , after forming the mask layer 70 , a thin conductive layer 80 for side wiring is formed in a portion not covered by the mask layer 70 in the edge region of the glass substrate 12 . (S12).

The thin conductive layer 80 may be deposited on the edge region of the glass substrate 12 by sputtering. In the present disclosure, it is described that the thin conductive layer 80 is formed by a sputtering method, but the present disclosure is not limited thereto, and as described above, it may be formed by one of an ink jet method, a stamping method, a screen printing method, and a spray method.

After forming the thin conductive layer 80, the thin conductive layer 80 is irradiated with laser trimming to remove a part of the thin conductive layer to form side wiring (S13).

Specifically, the laser beam 91 is irradiated along a preset virtual line serving as a boundary of each side wiring 30 in the thin conductive layer 90 . Accordingly, as shown in FIG. 14 , while a part of the thin conductive layer 80 is trimmed by a laser beam, each side wiring 30 may be formed at a predetermined interval G1 . As described above, the interval G1 between the adjacent side wirings 30 may be adjusted according to the focusing depth of the laser beam.

At this time, a trench 93 having a predetermined depth may be formed in the side surface SS of the glass substrate as shown in FIG. 15 while the thin conductive layer 90 is trimmed by a laser beam between the adjacent side wirings 30 .

The depth of the trench 93 may be determined by adjusting the focusing of the laser beam. Accordingly, the trench 93 is not formed by controlling the focusing of the laser beam and only the thin conductive layer of the portion serving as the boundary between the adjacent side wirings 30 may be removed.

The trench 93 formed in the side SS of the glass substrate increases the in-plane distance between adjacent side wirings, thereby preventing re-deposition in laser trimming or short circuit caused by other foreign substances. . In addition, when the foreign material is adsorbed to the side surface SS of the glass substrate, the foreign material may be easily removed through air spraying or other physical cleaning. In addition, it is possible to fundamentally block the adsorption of foreign substances to the substrate by attaching an insulating protective film or the like to the side surface SS of the glass substrate. In addition, it is possible to buffer the decrease in durability due to the difference in the coefficient of thermal expansion between the glass substrate 12 and the side wiring 30 , thereby contributing to the improvement of the durability of the display module 1 .

After the laser trimming process, the side wiring process may be completed by removing the mask layer 70 from the glass substrate 12 as shown in FIG. 16 ( S14 ). In addition, the laser trimming process and the mask layer removal process may be performed by changing the order.

Meanwhile, in the present disclosure, it is described that the thin conductive layer is formed through a deposition process, but is not limited thereto. For example, the thin conductive layer is formed through one of an ink jet method, a stamping method, a spray method, and a screen printing method. In this case, it may be formed on the edge region of the glass substrate by application of a conductive ink based on Au, Ag, or Cu.

17 is a perspective view illustrating an example in which an insulating member is formed in a trench formed on a side surface of a glass substrate, and FIG. 18 is a plan view illustrating an example in which a protective layer is formed on a side surface of the glass substrate.

Referring to FIG. 17 , an insulating member 100 may be formed in each trench 93 to protect the side wiring 30 from external impact. The length of the insulating member 100 may be at least equal to or longer than the length of the trench 93 .

The trench 93 may be applied to the insulating member 100 by a fine dispensing process or the like. In this case, the insulating member 100 is preferably formed to protrude more than the side surface SS and the side wiring 30 of the glass substrate.

The first portion 31 of the side wiring is relatively lower than the insulating member 100 due to the step formed between the side surface SS of the glass substrate and the insulating member 100 , and is positioned inwardly. Accordingly, it is possible to effectively protect the side wiring 30 from an external impact applied to the glass substrate 12 , thereby improving the durability of the display module 1 .

Referring to FIG. 18 , as an additional measure to protect the side wiring 30 , the protective layer 110 covering the side surface SS of the glass substrate may be formed. The protective layer 110 may be made of an insulating material.

In this case, the plurality of insulating members 100 increase the area that can be in contact with the protective layer 110 as well as provide a structure protruding from the side surface SS of the glass substrate, and thus the side surface SS of the glass substrate. Adhesion between the and the protective layer 110 may be improved.

Also, although not shown in the drawings, the protective layer 110 may be formed to cover the entire side surface SS of the glass substrate in a state in which the insulating member 100 is not formed in the trench 93 . In this case, as a portion of the protective layer 110 enters the trench 93 , the contact area with the side surface SS of the glass substrate increases, thereby improving bonding strength with the side surface SS of the glass substrate.

Meanwhile, in the above description, laser trimming is introduced in the description of the method of forming the side wiring, but the present invention is not limited thereto, and it is of course possible to form the side wiring by another method described below.

19 is a flowchart illustrating another example of a process of forming a side wiring in an edge region of a glass substrate.

First, the mask layer 70 is formed on the glass substrate 12 in the same manner as the side wiring method described above ( S21 ).

After forming the mask layer 70, a plurality of fine mask lines (not shown) are spaced apart from each other along a preset virtual line serving as a boundary of each side wiring 30 on the side surface SS of the glass substrate. Fencing (S22).

In this case, the width of the fine mask line may be the interval G1 between the adjacent side wirings 30 .

After the fine mask line is formed, a thin conductive layer 80 for side wiring is formed in a portion not covered by the mask layer 70 in the edge region of the glass substrate 12 (S23).

In this case, the thin conductive layer 80 covers the portion not covered by the mask layer 70 in the edge region of the glass substrate 12 and also covers a plurality of fine mask lines.

The thin conductive layer 80 has been described as being deposited on the edge region of the glass substrate 12 by a sputtering method, but is not limited thereto and may be formed by one of an ink jet method, a stamping method, a spray method, and a screen printing method. may be

After the thin conductive layer 80 is formed, the mask layer 70 and the fine mask line are removed together (S24).

In this case, a portion of the thin conductive layer 80 covering the fine mask line is removed from the side surface SS of the glass substrate together with the fine mask line, and the adjacent side wiring 30 is formed at a predetermined interval G1.

20 is a cross-sectional view schematically illustrating an example in which side wiring covers up to a portion of the insulating layer formed on the front and rear surfaces of the glass substrate.

Referring to FIG. 20 , the second portion 232 of the side wiring 230 covers the first connection pad 240 and a portion of the first insulating layer 227 formed on the front surface of the glass substrate 212 . Here, a portion of the first insulating layer 227 may be an edge portion of the first insulating layer 227 adjacent to the first connection pad 240 .

An anti-oxidation film (not shown) of a thin film may be formed on an upper surface of the first connection pad 240 to prevent oxidation of the first connection pad 240 . In this case, the second portion 232 of the side wiring may be formed on the upper surface of the anti-oxidation layer, and the thickness is sufficient to allow electrical connection between the first connection pad 240 and the second portion 232 of the side wiring. can be formed.

An inorganic insulating layer 243 may be formed around the first connection pad 240 . Accordingly, the first connection pad 240 may be insulated by the inorganic insulating layer 243 along the peripheral portion.

The first insulating layer 227 formed on the entire surface of the glass substrate 212 may be formed of an organic insulating layer or an inorganic insulating layer, or may have a structure in which an inorganic insulating layer and an organic insulating layer are stacked. The edge portion of the first insulating layer 227 may be spaced apart from the first connection pad 240 by a predetermined interval.

The second portion 232 of the side wiring may be divided into two regions 232a and 232b. The first region 232a may extend from the first portion 231 of the side wiring, cover the first chamfer surface CS11 of the glass substrate, and may be a region that continuously completely covers the first connection pad 240 . The second region 232b may extend from the first region 232a and cover an edge portion of the first insulating layer 227 adjacent to the first connection pad 240 .

As such, when the second portion 232 of the side wiring covers up to the edge portion of the first insulating layer 227 , it is wider than when the second portion 232 of the side wiring covers only the first connection pad 240 . The contact area can be secured. Accordingly, the second portion 232 of the side wiring is not peeled from the glass substrate 212 and stably coupled to the glass substrate 212 may be maintained.

The third portion 233 of the side wiring may cover the edge portion of the second insulating layer 228 formed on the rear surface of the glass substrate 212 like the second portion 232 of the above-described side wiring.

An anti-oxidation layer (not shown) of a thin film may be formed on the upper surface of the second connection pad 250 to prevent oxidation of the second connection pad 245 . In this case, the anti-oxidation layer may be formed to a thickness that allows electrical connection between the second connection pad 250 and the third portion 233 of the side wiring.

An inorganic insulating layer 253 may be formed around the second connection pad 250 . Accordingly, the second connection pad 250 may be insulated by the inorganic insulating layer 253 along the peripheral portion.

The second insulating layer 228 formed on the rear surface of the glass substrate 212 may be formed of an organic insulating layer or an inorganic insulating layer, or may have a structure in which an inorganic insulating layer and an organic insulating layer are stacked. The edge portion of the second insulating layer 228 may be spaced apart from the second connection pad 250 by a predetermined distance.

The third portion 233 of the side wiring may be divided into two regions 233a and 233b. The first region 233a may extend from the first portion 231 of the side wiring, cover the second chamfered surface CS12 of the glass substrate, and may be a region that continuously completely covers the second connection pad 250 . The second region 233b may extend from the first region 233a and cover an edge portion of the second insulating layer 228 adjacent to the second connection pad 250 .

As such, when the third portion 233 of the side wiring covers up to the edge portion of the second insulating layer 228 , it is wider than when the third portion 233 of the side wiring covers only the second connection pad 250 . The contact area can be secured. Accordingly, the third portion 233 of the side wiring is not separated from the glass substrate 212 and stably coupled to the glass substrate 212 may be maintained.

As shown in FIG. 20 , in the side wiring 230 , the second part 232 covers up to the edge of the first insulating layer 227 and the third part 233 covers up to the edge of the second insulating layer 228 . Although described, it is not necessary to be limited thereto. For example, the side wiring 230 may be configured such that the second portion 232 covers up to the edge portion of the first insulating layer 227 and the third portion 233 covers only the second connection pad 240 . . Also, the side wiring 230 may be configured such that the second portion 232 covers only the second connection pad 250 and the third portion 233 covers the edge portion of the second insulating layer 228 .

In FIG. 20 , reference numeral SS10 denotes a side surface of the glass substrate 212 to which the first portion 231 of the side wiring is coupled.

21 is a plan view illustrating an example in which adjacent side wirings respectively cover corresponding connection pads, and FIG. 22 is a cross-sectional view taken along line A-A shown in FIG. 21 .

In the present disclosure, both ends (the second part and the third part) of the side wirings disposed adjacent to each other may be connected to each other corresponding to one connection pad.

21 and 22 , the second part 232-1 of the first side wiring is stacked on one first connection pad 240-1, and the second part 232 of the first side wiring is formed by stacking. The second portion 232 - 2 of the other first side wiring disposed adjacent to −1) may be stacked on one other first connection pad 240 - 1 .

In this case, the edge portion of the first insulating layer 227 adjacent to the first connection pads 240 - 1 and 240 - 2 may be covered by the second portions 232-1 and 232 - 2 of the side wiring. . The inorganic insulating layers 243-1 and 243-2 surrounding the first connection pads 240-1 and 240-2, respectively, may also be covered by the second portions 232-1 and 232-2 of the side wiring. have.

Protrusions 227a positioned between the first connection pads 240 - 1 and 240 - 2 may be formed on the edge of the first insulating layer 227 . Accordingly, the protrusions 227a forming a part of the first insulating layer 227 may also be covered by the second portions 232 - 2 and 232 - 3 of the side wiring.

Although not shown in the drawing, the third portions of the side wiring also have a second insulating layer formed on the rear surface of the glass substrate together with the second connection pad similarly to the second portions 232-1 and 232-2 of the side wiring. It can cover up to the edge part of

23 is a plan view illustrating an example in which one side wiring covers a plurality of adjacently arranged connection pads.

When at least two or more first connection pads transmit a single signal, the side wiring may cover all of the at least two or more first connection pads.

Referring to FIG. 23 , the second portion 237 of one side wiring may cover the plurality of first connection pads 240 - 1 , 240 - 2 , and 240 - 3 at once. In addition, the second portion 237 of the side wiring may cover up to the edge portion of the first insulating layer 227 .

In this case, the plurality of first connection pads 240 - 1 , 240 - 2 and 240 - 3 transmitting a single signal may be arranged adjacent to each other.

Since the second portion 237 of the side wiring may have a larger contact area than the case of covering only one first connection pad, the side wiring may be more firmly coupled to the glass substrate.

Although not shown in the drawings, the third portion of the side wiring may also cover a plurality of adjacent second connection pads for transmitting a single signal at once similarly to the second portion. In addition, the second portion of the side wiring may cover up to an edge portion of the second insulating layer formed on the rear surface of the glass substrate.

Hereinafter, embodiments in which the coupling force between the connection pad and the side wiring can be more firmly maintained by the concavo-convex structure in the present disclosure will be described.

24 is a cross-sectional view illustrating an example in which connection pads and side wirings are formed after forming concavities and convexities on a glass substrate.

Referring to FIG. 24 , before forming the first connection pads 1240-1 and 1240-2 on the glass substrate 1212, the glass substrate on which the first connection pads 1240-1 and 1240-2 will be respectively disposed. Fine unevenness 1212a is formed in a partial region of the front surface of 1212 . The minute unevenness 1212a formed on a partial area of the front surface of the glass substrate 1212a may be formed through an etching process. In this case, the etching agent can use hydrofluoric acid, for example.

After the concavo-convex 1212a is formed on the glass substrate 1212 , first connection pads 1240-1 and 1240-2 are formed on the concave-convex 1212a. In this case, the first connection pads 1240 - 1 and 1240 - 2 may be formed on the unevenness 1212a through a metal deposition process such as sputtering.

As the first connection pads 1240 - 1 and 1240 - 2 are formed as thin films, they are formed by deposition along the profile of the concavo-convex 1212a, and thus may have a concave-convex structure similar to the concavo-convex 1212a of the glass substrate.

Next, side wirings may be formed on the glass substrate 1212 through a metal deposition process. In this case, as the second portions 1232-1 and 1232-2 of the side wiring are deposited and formed on the first connection pads 1240-1 and 1240-2 each having a concave-convex structure, they naturally have a concave-convex structure. may be coupled to the first connection pads 1240 - 1 and 1240 - 2 in this state.

Accordingly, since the second portions 1232-1 and 1232-2 of the side wiring are unevenly coupled to the first connection pads 1240-1 and 1240-2, the second portions 1232-1 of the side wiring , 1232 - 2 ) and the first connection pads 1240 - 1 and 1240 - 2 may have an increased contact area.

Although not shown in the drawing, the third portions of the side wiring and the corresponding second connection pads are also the second portions 1232-1 and 1232-2 and the first connection pads 1240- of the side wiring. 1, 1240-2) may achieve the same or similar bonding state as the concave-convex bonding between the two.

The side wiring may be more firmly coupled to the glass substrate 1212 by the concave-convex coupling.

In FIG. 24 , reference numeral 1227a denotes protrusions of the first insulating layer.

25 is a cross-sectional view illustrating an example in which a connection pad and a side wiring are formed after irregularities are formed on the metal wiring.

Referring to FIG. 25 , after forming the first connection pads 2240-1 and 2240-2 on the glass substrate 2212 on which the unevenness is not formed, the first connection pads 2240-1 and 2240-2 are formed through a laser process. 2240-2) to form a fine concavo-convex structure.

Next, side wirings may be formed on the glass substrate 2212 through a metal deposition process. In this case, since the second portions 2232-1 and 2232-2 of the side wiring are formed by deposition along the surfaces of the first connection pads 2240-1 and 2240-2 each having a concave-convex structure, the first connection pad Concave-convex coupling may be performed on the ones 1240 - 1 and 1240 - 2 . Accordingly, a contact area between the second portions 2232-1 and 2232-2 of the side wiring and the first connection pads 2240-1 and 2240-2 may increase.

Although not shown in the drawings, the third portions of the side wiring and the corresponding second connection pads are also the second portions 2232-1 and 2232-2 and the first connection pads 2240- of the side wiring. 1, 2240-2) may achieve the same or similar bonding state as the concave-convex bonding between the two.

Due to the concave-convex coupling, the side wiring may be more firmly coupled to the glass substrate 2212 .

In FIG. 25 , reference numeral 2227a denotes protrusions of the first insulating layer, and 2243-1 and 2243-2 denote inorganic insulating layers surrounding the first connection pads 2240-1 and 2240-2, respectively.

26 is a cross-sectional view illustrating an example in which side wiring is formed after forming a plurality of grooves in the connection pad, FIG. 27 is a perspective view of the connection pad shown in FIG. 26, and FIG. 28 is a plurality of protrusions formed in the connection pad It is a perspective view showing an example.

26 and 27 , grooves GV1 , GV2 , and GV3 having a predetermined shape may be formed on the upper surfaces of the first connection pads 3240 - 1 and 3240 - 2 through an etching process, respectively.

At least two grooves GV1 , GV2 , and GV3 may be formed according to the areas of the first connection pads 3240 - 1 and 3240 - 2 . In addition, the grooves GV1 , GV2 , and GV3 are arranged in one row along the length direction of the first connection pads 3240 - 1 and 3240 - 2 , but are not limited thereto, and may form a zigzag direction or an irregular arrangement. can

Accordingly, when the second portions 3232 - 1 and 3232 - 2 of the side wiring are deposited on the first connection pads 3240 - 1 and 3240 - 2 , as shown in FIG. 26 , the grooves GV1 and GV2 are formed. , GV3) may form a concave-convex coupling with the first connection pads 3240 - 1 and 3240 - 2 .

The side wiring may be more firmly coupled to the glass substrate 3212 by the concave-convex coupling.

The second portions 3232-1 and 3232-2 of the side wiring are connected to the corresponding first connection pads 3240-1 and 3240-2 through protrusions other than the aforementioned grooves GV1, GV2, and GV3. Concave-convex bonding is also possible.

For example, as shown in FIG. 28 , protrusions P1 , P2 , and P3 may be formed on the upper surface of the first connection pad 3240 - 1a at a predetermined height.

Although not shown in the drawings, the second connection pads may also form the aforementioned recesses GV1 , GV2 , and GV3 or the protrusions P1 , P2 , and P3 . In this case, the third portions of the side wiring formed by deposition on the second connection pads may form a concave-convex coupling with the second connection pads.

In FIG. 26 , reference numeral 3227a denotes a protrusion of the first insulating layer, and 3243-1 and 3243-2 denote inorganic insulating layers surrounding the first connection pads 3240-1 and 3240-2, respectively.

29 is a cross-sectional view illustrating an example of forming a side wiring after forming a plurality of via holes in an organic insulating layer formed on an upper portion of a connection pad.

Referring to FIG. 29 , after forming an inorganic insulating layer 4243 to a predetermined thickness on the first connection pad 4240 to completely cover the first connection pad 4240 , an etching process is performed to form a via hole in the inorganic insulating layer 4243 . 4245 may be formed.

In the first connection pad 4240 , regions corresponding to the via holes 4245 are exposed without being covered by the inorganic insulating layer 4243 . In this state, when side wirings are formed on the glass substrate 4212 through a metal deposition process, the second portion 4232 of the side wirings may be formed on the inorganic insulating layer 4243 to a predetermined thickness.

In this case, the second portion 4232 of the side wiring may be electrically connected to the first connection pad 4240 through the via holes 4245 . The side wiring may be more firmly coupled to the glass substrate 4212 by the concave-convex coupling.

Although not shown in the drawings, the third portion of the side wiring and the second connection pad corresponding thereto also have the same or similar coupling state to the concave-convex coupling between the second part 4232 and the first connection pads 4240 of the side wiring. can achieve

In FIG. 29, reference numeral 4227a denotes protrusions of the first insulating layer.

30 is a plan view illustrating a welding area irradiated with a laser beam on a side wiring.

Referring to FIG. 30 , in a state in which the second portion 5242 of the side wiring covers the edge portions of the first connection pad 5240 and the first insulating layer 5227 , the second part 5242 and the first side wiring The welding part 5500 may be formed by irradiating a laser beam to the area where the connection pad 5240 overlaps.

In the welding part 5500 , as shown in FIG. 25 , a concave-convex structure may be formed on the second part 5242 and the first connection pad 5240 of the side wiring.

Although not shown in the drawings, when the welding part 5500 is formed in the overlapping portion of the third portion of the side wiring and the corresponding second connection pad, the third portion of the side wiring and the corresponding second connection pad are formed as described above. The same or similar coupling state as the uneven coupling between the second portion 5232 of the side wiring and the first connection pads 5240 may be achieved.

In FIG. 30 , reference numeral 5227a denotes protrusions of the first insulating layer.

31 is a plan view showing an example in which a part of the connection pad is covered by the insulating layer and the side wiring covers the connection pad and the edge portion of the insulating layer together, and FIG. 32 is a cross-sectional view taken along the line B-B shown in FIG. 31 .

In some cases, the first insulating layer 6227 may be formed to cover a portion of the first connection pad 6240 . For example, as shown in FIG. 31 , a portion of the first connection pad 6240 may be covered by an edge portion of the first connection pad 6240 and the remaining portion may be exposed.

31 and 32 , the second portion 6232 of the side wiring may cover the first connection pad 6240 and the edge portion of the first insulating layer 6227 together. A center of the second portion 6232 of the side wiring may be electrically connected to the first connection pad 6240 , and both sides may cover the protrusions 6227a of the first insulating layer 7227 .

Although not shown in the drawings, the second insulating layer formed on the rear surface of the glass substrate 6212 may cover a portion of the second connection pad. In this case, the third portion of the side wiring may cover the corresponding second connection pad and the edge portion of the second insulating layer together.

With this structure, the second and third portions of the side wiring may be more firmly coupled to the glass substrate as an area in contact with the glass substrate increases.

In the above, preferred embodiments of the present disclosure have been illustrated and described, but the present disclosure is not limited to the specific embodiments described above, and it is common in the technical field pertaining to the present disclosure without departing from the gist of the present disclosure as claimed in the claims. Various modifications may be made by those having the knowledge of

12: glass substrate
13: TFT layer
18a, 240, 1240, 2240, 3240, 4240, 5240, 6240: first contact pad
19a, 250: second contact pad
20: micro LED
30, 230: side wiring
31, 231: the first part of the side wiring
32, 232, 1232, 2232, 3232, 4232, 5232, 6232: second part of side wiring
33, 233: the third part of the side wiring
40: insulation member
50: protective layer
227, 1227, 2227, 3227, 4227, 5227, 6227 first insulating layer
228: second insulating layer
FS: Front of glass substrate
RS: the back side of the glass substrate
SS: the side of the glass substrate
CS1: 1st chamfered surface
CS2: 2nd chamfered surface
GV1, GV2, GV3: Groove
P1, P2, P3: protrusions

Claims (29)

A thin film transistor (TFT) layer is disposed on a front surface and a driving circuit for driving the TFT layer is disposed on a rear surface, a first edge zone corresponding to a side surface and the front surface adjacent to the side surface a glass substrate including an edge region comprising a second edge zone corresponding to a portion and a third edge zone corresponding to a portion of the rear surface adjacent to the side surface;
a plurality of LEDs (Light Emitting Diodes) electrically connected to the TFT layer of the glass substrate;
a plurality of first connection pads disposed at intervals in the second edge zone and electrically connected to a TFT circuit provided in the TFT layer through wirings;
a plurality of second connection pads disposed at intervals in the third edge zone and electrically connected to the driving circuit through wirings; and
a plurality of side wirings having one end completely covering the corresponding first connection pad and the other end completely covering the corresponding second connection pad; and
At least one of one end and the other end of the side wiring covers a part of the insulating layer formed on the glass substrate, the display module. According to claim 1,
The insulating layer is an organic insulating film or an inorganic insulating film formed on the front and rear surfaces of the glass substrate, the display module. According to claim 1,
and the insulating layer is disposed adjacent to the first connection pad or the second connection pad with a gap therebetween. According to claim 1,
and the insulating layer covers a part of the first connection pad or the second connection pad. According to claim 1,
The glass substrate has irregularities formed in the second edge zone,
One end of the first connection pad and the side wiring sequentially stacked on the unevenness has an uneven shape. According to claim 1,
The first connection pad is formed with irregularities,
One end of the side wiring stacked on the unevenness has an uneven shape. According to claim 1,
The first connection pad forms an unevenness formed by a laser process or an etching process,
The side wiring is formed on the glass substrate through a deposition process, and a portion of the side wiring formed on the unevenness has a concave-convex shape. According to claim 1,
a via structure made of an insulating material is formed on the first connection pad;
A portion of the side wiring formed on the via structure has a concave-convex shape and is electrically connected to the first connection pad. According to claim 1,
The glass substrate includes an edge region comprising a first edge zone corresponding to a side surface, a second edge zone corresponding to a portion of the front surface adjacent to the side surface, and a third edge zone corresponding to a portion of the rear surface adjacent to the side surface,
The plurality of side wirings are arranged at regular intervals,
In each side wiring, a width of the first portion formed in the first edge zone is greater than a width of a second portion formed in the second edge zone and a width of a third portion formed in the third edge zone. 10. The method of claim 9,
A distance between the first portions of the adjacent side wirings is smaller than the respective widths of the second and third portions of the display module. 10. The method of claim 9,
A distance between the first portions of the side wirings adjacent to each other is smaller than a spacing between the second portions of the side wirings adjacent to each other and a distance between the third portions of the side wirings adjacent to each other. 10. The method of claim 9,
The first portion of the side wiring gradually extends from a point connected to the second portion to a predetermined distance away from the second portion, and gradually from a point connected to the third portion to a predetermined distance away from the third portion. A display module including a section extending to . 13. The method of claim 12,
The first portion of the side wiring includes a section formed with a constant width between the extended sections on both sides. 10. The method of claim 9,
The glass substrate further includes a first chamfered surface formed between the first and second edge zones, and a second chamfered surface formed between the first and third edge zones. 14. The method of claim 13,
The side wiring is formed to extend along the second edge zone, the first chamfered surface, the first edge zone, the second chamfered surface, and the third edge zone. 10. The method of claim 9,
A display module having a trench formed in the first edge zone of the glass substrate to increase the in-plane distance between the first portions of the side wirings adjacent to each other. 17. The method of claim 16,
The glass substrate further includes an insulating member coupled along the trench,
The insulating member protrudes higher than the first portion of the side wiring from the side surface of the glass substrate. 18. The method of claim 17,
The glass substrate further includes a protective layer covering the entire side surface of the glass substrate. A thin film transistor (TFT) layer is disposed on a front surface and a driving circuit for driving the TFT layer is disposed on a rear surface, a first edge zone corresponding to a side surface and the front surface adjacent to the side surface a glass substrate including an edge region comprising a second edge zone corresponding to a portion and a third edge zone corresponding to a portion of the rear surface adjacent to the side surface;
a plurality of LEDs (Light Emitting Diodes) electrically connected to the TFT layer of the glass substrate;
a plurality of first connection pads disposed at intervals in the second edge zone and electrically connected to a TFT circuit provided in the TFT layer through wirings;
a plurality of second connection pads disposed at intervals in the third edge zone and electrically connected to the driving circuit through wirings; and
a plurality of side wirings electrically connecting the plurality of first connection pads and the plurality of second connection pads;
one side wiring completely covers two or more first connection pads arranged adjacent to each other at one end and completely covers two or more second connection pads arranged adjacent to each other at the other end;
At least one of one end and the other end of the one side wiring covers a portion of the insulating layer formed on the glass substrate. forming a glass substrate provided with a TFT layer on its entire surface and including at least one edge region;
forming a mask layer formed to cover the front and rear surfaces of the glass substrate and covering portions of the front and rear surfaces of the glass substrate adjacent to the side surfaces of the glass substrate in a concave-convex shape;
forming a thin conductive layer on a side surface of the glass substrate and on an area not covered by the mask layer on the front and rear surfaces of the glass substrate;
forming a plurality of side wirings at regular intervals by removing a portion of the thin conductive layer; and
removing the mask layer;
A method of manufacturing a display module in which the width of the first portion of the side wiring formed on the side surface of the glass substrate is larger than the width of the second and third portions of the side wiring formed by the concavo-convex shape of the mask. 21. The method of claim 20,
A method of manufacturing a display module in which a width of a first portion of a side wiring formed on a side surface of the glass substrate is determined according to a width of a portion removed from the thin conductive layer. 21. The method of claim 20,
The thin conductive layer is formed by deposition on the glass substrate by sputtering,
A method of manufacturing a display module in which a portion of the thin conductive layer formed on the side surface of the glass substrate is removed by laser trimming. 23. The method of claim 22,
A method of manufacturing a display module in which a trench is formed in a portion from which a part of the thin conductive layer formed on the side surface of the glass substrate is removed. 24. The method of claim 23,
The manufacturing method of the display module further comprising the step of forming a protective layer covering the entire side of the glass substrate. 24. The method of claim 23,
Further comprising the step of forming an insulating member in the trench,
The insulating member is formed to protrude higher than the first portion of the side wiring from a side surface of the glass substrate. 26. The method of claim 25,
The manufacturing method of the display module further comprising the step of forming a protective layer covering the entire side of the glass substrate. 21. The method of claim 20,
forming a first chamfered surface by machining an edge formed by meeting the front and side surfaces of the glass substrate; and
The method of manufacturing a display module further comprising; machining an edge formed by meeting a rear surface and a side surface of the glass substrate to form a second chamfered surface. forming a glass substrate provided with a TFT layer on its entire surface and including at least one edge region;
forming a mask layer formed to cover the front and rear surfaces of the glass substrate and covering portions of the front and rear surfaces of the glass substrate adjacent to the side surfaces of the glass substrate in a concave-convex shape;
forming fine mask lines at intervals on the side surfaces of the glass substrate;
forming a thin conductive layer on a side surface of the glass substrate and on an area not covered by the mask layer on the front and rear surfaces of the glass substrate; and
removing the mask layer and the fine mask line;
A method of manufacturing a display module in which the width of the first portion of the side wiring formed on the side surface of the glass substrate is larger than the width of the second and third portions of the side wiring formed by the concavo-convex shape of the mask. 29. The method of claim 28,
A distance between the first portions of the side wirings adjacent to each other is determined by a width of the fine mask line.

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