Patent Description:
A self-light emitting display element that displays an image without a color filter and a backlight may use a light emitting diode (LED) inorganic self-light emitting element that emits light by itself.

A display module expresses various colors as it is operated in a unit of pixels or sub-pixels composed of LED inorganic self-light emitting elements, and an operation of each pixel or sub-pixel is controlled by a thin film transistor (TFT). 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 a large TV up to several tens of inches from a small device such as a flexible device and a wearable device (for example, a wearable watch, etc.) and used as a substrate for driving a display. In order to drive the TFT substrate, the TFT substrate is connected with an external integrated circuit (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 a chip on glass (COG) bonding or a film on glass (FOG) bonding. For such connection, an area having a constant area, that is, a bezel area, needs to be secured at an edge of the TFT substrate.

Recently, research and development of a bezel-less technology that reduces or eliminates the bezel area so as to maximize an area where an image is displayed in the display module, that is, an active area, have been steadily progressed. <CIT> describes a light emitting diode display device and a multi-screen display device using the same, which include a minimized bezel area. <CIT> describes a display device and a multi-screen display device using the same, which include a minimized bezel area. <CIT> describes a display device. <CIT> describes a display panel. <CIT> describes a display module including a glass substrate; a thin film transistor layer disposed in a first area of the glass substrate; a plurality of connection pads disposed in a second area extending from the first area of the glass substrate and electrically connected to the thin film transistor layer; a plurality of test pads disposed in a third area extending from the second area of the glass substrate and electrically connected to the plurality of connection pads, respectively, and a plurality of connection wirings electrically connecting the plurality of connection pads and the plurality of test pads.

Embodiments of the disclosure overcome the above disadvantages and other disadvantages not described above. Also, the disclosure is not required to overcome the disadvantages described above, and an embodiment of the disclosure may not overcome any of the problems described above.

The disclosure provides a display module having a glass substrate on which side wirings are formed that may implement a bezel-less design by forming the side wirings in an edge area of the glass substrate to minimize a bezel area of the glass substrate in which a circuit is formed on one surface and disposing a bonding area of a driving circuit on a back surface of the glass substrate, and a manufacturing method of the same.

The disclosure also provides a display module having a glass substrate on which side wirings are formed that may prevent damage on a circuit formed on the glass substrate upon processing the side wirings with a laser beam, and a manufacturing method of the same.

According to a first aspect of the present invention, a display module according to claim <NUM> includes a glass substrate of a quadrangle type having a front surface and a back surface opposite to the front surface; a thin film transistor (TFT) layer formed on the front surface of the glass substrate; a plurality of light emitting diodes (LEDs) mounted on the TFT layer; and a plurality of side wirings formed at intervals in an edge area of the glass substrate, wherein the edge area includes a first area corresponding to a side surface of the glass substrate, a second area adjacent to the side surface of the glass substrate in the front surface of the glass substrate, and a third area adjacent to the side surface of the glass substrate in the back surface of the glass substrate, and a first chamfered surface formed at a corner at which the first area and the second area meet, and a second chamfered surface formed at a corner at which the first area and the third area meet, and each of the plurality of side wirings is disposed along the second area, the first chamfered surface, the first area, the second chamfered surface, and the third area.

A height of the first chamfered surface may be less than <NUM>% of a thickness t of the glass substrate.

A height of the second chamfered surface may be less than <NUM>% of a thickness t of the glass substrate.

The plurality of side wirings may be formed by screen printing with conductive ink.

One end portion of each of the plurality of side wirings may be electrically connected to a first connection pad disposed in the second area, another end portion of each of the plurality of side wirings may be electrically connected to a second connection pad disposed in the third area, and the first connection pad may be connected to a pixel driving circuit of the TFT layer, and the second connection pad may be connected to a driver integrated circuit disposed in a rear surface of the glass substrate.

The display module according the present invention further includes a plurality of connection pads formed in the edge area and electrically connected to the plurality of side wirings, and an insulating layer having grooves and disposed on the plurality of connection pads, the plurality of connection pads formed in the edge area being partially exposed by the grooves of the insulating layer.

According to another aspect of the present invention, a manufacturing method of a display module according to claim <NUM> includes forming a thin film transistor (TFT) layer on a glass substrate; forming a chamfered surface at a corner of at least one edge area of edge areas of the glass substrate; forming a plurality of side wrings electrically connected to a plurality of connection pads disposed in an edge of the TFT layer in the at least one edge area of the glass substrate in which the chamfered surface is formed; transferring a plurality of light emitting diodes (LEDs) onto the TFT layer; and disposing an insulating layer having grooves on the plurality of connection pads, the plurality of connection pads formed in the edge area being partially exposed by the grooves of the insulating layer.

The chamfered surface may be formed to have a height less than <NUM>% of a thickness of the glass substrate.

An inclination angle of the chamfered surface may be less than <NUM> degrees with respect to an imaginary plane extending from a side surface of the glass substrate.

The plurality of side wirings may be formed by one of a laser patterning process, a pad printing process, an ink screening process, and a sputtering process.

In the forming of the plurality of side wirings, the plurality of side wirings may be formed at positions corresponding to a pair of opposing sides in the glass substrate, respectively.

In the forming of the plurality of side wirings, the number of the plurality of side wirings may be formed to be equal to or less than the number of LEDs mounted on the TFT layer.

The forming the plurality of side wirings may include forming a metal film on the edge area and a side surface of the glass substrate, irradiating, by a laser beam irradiator, a laser beam on the metal film from an end of the metal film to a middle portion of the chamfered surface, and rotating the glass substrate relative to the laser beam irradiator and irradiating, by the laser beam irradiator, the laser beam on the metal film from the middle portion of the chamfered surface to the side surface.

The forming the plurality of side wirings may include preparing a carrier film having a plurality of conductive ribbons, disposing the carrier film on the edge area, performing a thermal compressing on the edge area, and removing the carrier film with the plurality of conductive ribbons remaining in the edge area.

The forming the plurality of side wirings may include preparing a three-dimensional pad having a plurality of conductive ribbons, disposing the three-dimensional pad on the edge area, pressing the three-dimensional pad at a predetermined pressure and separating the three-dimensional pad from the edge area with the plurality of conductive ribbons remaining in the edge area.

The forming the plurality of side wirings may include applying, by a nozzle, a conductive ink on the glass substrate from a connection pad of the plurality of connection pads to the edge area, rotating the glass substrate relative to the nozzle, and applying, by the nozzle, the conductive ink on the glass substrate from the chamfered surface toward a side surface the glass substrate.

The above and/or other aspects of the disclosure will be more apparent by describing certain embodiments of the present disclosure with reference to the accompanying drawings, in which:.

Hereinafter, diverse embodiments will be described in more detail with reference to the accompanying drawings. The embodiments described in the specification may be variously modified. A specific embodiment may be illustrated in the drawings and be described in detail in a detailed description. However, the specific embodiment illustrated in the accompanying drawings is provided only to allow the diverse embodiments to be easily understood. Therefore, it should be understood that the disclosure is not limited by the specific embodiment illustrated in the accompanying drawings, but includes all the equivalents or substitutions included in the disclosure.

Terms including ordinal numbers such as 'first', 'second', and the like, may be used to describe various components, but such components are not limited by the above-mentioned terms. The terms described above are used only for the purpose of distinguishing one component from another component.

It should be further understood that terms "include" or "have" used in the specification specify the presence of features, numerals, steps, operations, components, parts mentioned in the specification, or combinations thereof, but do not preclude the presence or addition of one or more other features, numerals, steps, operations, components, parts, or combinations thereof. It is to be understood that when one element is referred to as being "connected to" or "coupled to" another element, it may be connected directly to or coupled directly to another element or be connected to or coupled to another element while having the other element interposed therebetween. On the other hand, when it is mentioned that any component is "directly coupled" or "directly connected" to another component, it is to be understood that any component may be coupled or connected to another element without the other component interposed therebetween.

Meanwhile, a term "module" or "~er/~or" for components used in the specification performs at least one function or operation. In addition, a "module" or a "~er/~or" may perform a function or an operation by hardware, software, or a combination of hardware and software. In addition, a plurality of "modules" or a plurality of "~ers/~ors" except for a "module" or a "~er/~or" performed by specific hardware or performed by at least one processor may be integrated in at least one module. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Further, when it is decided that a detailed description for the known function or configuration related to the disclosure may unnecessarily obscure the disclosure, the detailed description thereof will be abbreviated or omitted.

In the disclosure, side wirings may be formed on an edge area of a glass substrate to electrically connect a plurality of self-light emitting elements arranged on a front surface of the glass substrate and circuits located on a back surface of the glass substrate. A thin film transistor (TFT) layer on which a TFT circuit is formed may be disposed on the front surface of the glass substrate, and the circuit may not be disposed on the back surface of the glass substrate.

In the disclosure, the display module may have a black matrix formed between the plurality of LEDs arranged on the TFT layer. The black matrix may improve a contrast ratio by blocking light leakage from the periphery of the LEDs adjacent to each other.

In the disclosure, the display module may have a molding part formed to cover the plurality of LEDs and the black matrix together. The molding part may be formed of a transparent resin. In this case, the display module may have a touch screen disposed to be stacked on the molding part.

In the disclosure, one surface of the glass substrate on which the TFT layer is disposed may be divided into an active area and an inactive area. The active area may correspond to an area occupied by the TFT layer on one surface of the glass substrate, and the inactive area may correspond to an area included in the edge area on one surface of the glass substrate.

In the disclosure, the edge area of the glass substrate may be the outermost portion of the glass substrate. In addition, the edge area of the glass substrate may be an area other than the area of the glass substrate on which the circuit is formed. In addition, the edge area of the glass substrate may include side surfaces of the glass substrate, and a portion of the front surface of the glass substrate and a portion of the back surface of the glass substrate which are adjacent to the side surfaces.

In the disclosure, corners in the edge area included in the inactive area of the glass substrate may be chamfered to form chamfered surfaces having a predetermined angle. The chamfered surfaces may be formed at a corner between the front surface and the side surface of the glass substrate and at a corner between the back surface and the side surface of the glass substrate. In addition, it is also possible that the chamfered surface is formed only at the corner between the front surface and the side surface of the glass substrate. Such a chamfered surface may prevent the TFT circuit formed on the front surface of the glass substrate from being damaged by a laser beam when processing side wirings with the laser beam.

In the disclosure, it will be described that a plurality of side wirings are formed only in one edge area of four edge areas of the glass substrate, but the disclosure is not limited thereto and the plurality of side wirings may be formed in two or more edge areas as necessary. In this case, the chamfered surface formed in the edge area may be formed at least in all four edge areas of the glass substrate, and may also be formed in only the edge area in which the side wirings are formed.

In the disclosure, the glass substrate may be provided with a plurality of pixels. Each pixel may include a plurality of sub-pixels and a plurality of circuits for driving each pixel. Here, the sub-pixels may be a red LED, a green LED, and a blue LED. In the disclosure, the LED and the sub-pixel have the same meaning and may use the same reference numeral. The LED may be made of an inorganic light emitting material, and may be a semiconductor chip that may emit light by itself when power is supplied thereto. In addition, the LED may have a flip chip structure in which an anode electrode and a cathode electrode are formed on the same surface, and a light emitting surface is formed opposite the electrodes.

In the disclosure, it is possible to provide a display module including a glass substrate having a chamfered surface formed in an edge area, a plurality of pixels disposed on one surface of the glass substrate, and a plurality of side wirings formed at intervals in the edge area. In this case, one end portion of the plurality of side wirings may be electrically connected to a plurality of connection pads formed at the edge area existing on one surface of the glass substrate, respectively, and the other end portions of the plurality of side wirings may be electrically connected to the plurality of connection pads or driving elements formed at the edge area existing on the other surface of the glass substrate, respectively.

In order to minimize a bezel area of a display module, the plurality of connection pads may be formed in the edge area of the glass substrate, and a driver IC (Integrated Circuit) may be disposed in the other surface (or rear surface) of the glass substrate. Here, the driver IC may include a gate driver IC and a data driver IC.

One end of the plurality of side wirings is formed in a front surface of the glass substrate and electrically connected to a plurality of connection pads which are connected to a pixel driving circuit of the TFT layer for driving a LED, and another end is electrically connected to a plurality of second connection pads which are connected to the driver IC disposed in a rear surface of the glass substrate.

The plurality of first connection pads may be formed on the TFT layer together with a pixel driving circuit and wirings. In this case, the TFT layer may be provided in the form of a film and attached to a front surface of the glass substrate. The plurality of first connection pads may be located in an edge area (inactive area) of the front surface of the glass substrate. The active area may be an area occupied by the pixel driving circuit of the TFT layer in which a plurality of LEDs operate in the front surface of the glass substrate.

The plurality of second connection pads may be electrically connected to the driver IC through a plurality of wirings formed in the rear surface of the glass substrate. The plurality of second connection pads may be located in an edge area of the rear surface of the glass substrate.

In the disclosure, the glass substrate may be formed in a quadrangle type. Specifically, the glass substrate may be formed in a rectangle type or a square type.

As such, in the disclosure, the glass substrate on which the LEDs are mounted and the side wirings are formed may be referred to as a display module. Such a display module may be installed and applied to a wearable device, a portable device, a handheld device, and an electronic product or an electronic device requiring various displays in a single unit, and may be applied to a display device such as a monitor for a personal computer (PC), a high resolution TV and signage (or a digital signage), an electronic display, and the like through a plurality of assembly arrangements in a matrix type.

Hereinafter, a glass substrate on which side wirings are formed according to an embodiment of the disclosure will be described in detail with reference to the accompanying drawings.

<FIG> is a perspective view illustrating a glass substrate having side wirings according to an embodiment of the disclosure.

Referring to <FIG>, a glass substrate <NUM> having side wirings according to an example embodiment of the disclosure may include a circuit area <NUM> provided on a surface of the glass substrate <NUM> in which a TFT circuit is formed and a plurality of light emitting elements are mounted.

In the disclosure, the TFT circuit formed on the glass substrate <NUM> may be integrally formed on the surface of the glass substrate or may be manufactured separately from the glass substrate and then attached to the glass substrate.

For example, the TFT circuit may be integrally formed with the glass substrate by forming a thin film transistor (TFT) layer on a surface of the glass substrate through one or more photo patterning processes (deposition, photoresist (PR) coating, exposure, development, etching, and PR removal) on the surface of the glass substrate, or may be formed separately from the glass substrate by coating in the form of a film in which the TFT circuit is formed on the surface of the glass substrate.

The glass substrate <NUM> may have a plurality of connection pads <NUM> formed at predetermined intervals along an edge area <NUM> of the glass substrate <NUM>. The plurality of connection pads <NUM> may be electrically connected to a plurality of pixels <NUM> disposed on the circuit area <NUM> through wirings <NUM> formed on the surface of the glass substrate <NUM> as illustrated in <FIG>.

The glass substrate <NUM> may have a plurality of side wirings <NUM> formed in the edge area <NUM>. A width of each of the plurality of side wirings <NUM> may be several tens of micrometers (µm), and an interval between the side wirings <NUM> adjacent to each other may be several tens of micrometers. The width of each side wiring <NUM> may be equal to or larger than the interval between the side wirings adjacent to each other.

Here, the edge area <NUM> of the glass substrate <NUM> may include a first area corresponding to a side surface <NUM> of the glass substrate <NUM>, a second area adjacent to the side surface <NUM> in a surface <NUM> of the glass substrate <NUM>, and a third area adjacent to the side surface <NUM> in the other surface <NUM> of the glass substrate <NUM>. The surface <NUM> and the other surface <NUM> of the glass substrate <NUM> face in opposite directions.

Hereinafter, for convenience, the surface <NUM> of the glass substrate <NUM> is referred to as a front surface <NUM> of the glass substrate <NUM>, and the other surface <NUM> of the glass substrate <NUM> is referred to as a back surface <NUM> of the glass substrate <NUM>.

<FIG> is an enlarged plan view illustrating a part II in <FIG>.

Referring to <FIG>, the circuit area <NUM> may be partitioned into a plurality of pixel areas <NUM> in which a plurality of pixels <NUM> are arranged.

The plurality of pixel areas <NUM> may be partitioned into various forms, and for example, may be arranged in a matrix form. Each pixel area <NUM> may include a sub-pixel area <NUM> in which a plurality of pixels, that is, a red LED, a green LED, and a blue LED are mounted, and a driving circuit area <NUM> for driving each sub-pixel.

<FIG> and <FIG> are views each illustrating a unit pixel of the glass substrate <NUM> and illustrating example in which arrangements of sub-pixels are different from each other.

Referring to <FIG>, each pixel <NUM> may include a plurality of sub-pixels <NUM>, <NUM>, and <NUM> and a driving circuit (not illustrated) for driving each of the plurality of sub-pixels.

The plurality of sub-pixels may include a red LED <NUM>, a green LED <NUM>, and a blue LED <NUM>. The red LED <NUM>, the green LED <NUM>, and the blue LED <NUM> may be connected to the corresponding electrode pads <NUM>, <NUM>, and <NUM>, respectively, and may be simultaneously connected to a common electrode pad <NUM>, respectively.

The plurality of electrode pads <NUM>, <NUM>, and <NUM> may be disposed in the driving circuit area <NUM> and may be electrically connected to a plurality of driving circuits (not illustrated) for driving the plurality of sub-pixels, respectively. The common electrode pad <NUM> may also be electrically connected to various elements or grounds of the driving circuit area <NUM>.

Three LEDs <NUM>, <NUM>, and <NUM> may have a substantially L-shaped arrangement as illustrated in <FIG>. However, the arrangement of the LEDs is not limited thereto, and as illustrated in <FIG>, three LEDs 161a, 163a, and 165a may be arranged side by side at intervals.

In <FIG>, a common electrode 154a may be formed in a straight line in consideration of the arrangement of the three LEDs 161a, 163a, and 165a arranged side by side. In <FIG>, reference numeral 150a represents a pixel, 151a represents a pixel area, 152a represents a sub-pixel area, 153a represents a driving circuit area, and 155a, 157a, and 159a represent electrode pads.

Referring back to <FIG>, the glass substrate <NUM> may have the plurality of connection pads <NUM> formed at intervals in the edge area <NUM>. Each of the plurality of connection pads <NUM> may be electrically connected to each pixel <NUM> through the wiring <NUM>. Here, a part of the wiring <NUM> may correspond to a gate line and the other part of the wiring <NUM> may correspond to a data line.

In this case, the number of connection pads <NUM> formed in the edge area <NUM> may vary according to the number of pixels implemented in the glass substrate, and may vary according to a driving method of the TFT circuit disposed in the circuit area <NUM>. For example, in an active matrix (AM) driving method in which each pixel is individually driven, compared to the case in which the TFT circuit disposed in the circuit area <NUM> is driven by a passive matrix (PM) driving method in which a plurality of pixels are driven by horizontal lines and vertical lines, more wirings <NUM> and connection pads <NUM> may be required.

<FIG> is an enlarged perspective view illustrating a part V indicated in <FIG>.

Referring to <FIG>, the plurality of side wirings <NUM> are formed at regular intervals in the edge area <NUM>. Each side wiring <NUM> may have one end portion <NUM> electrically connected to the connection pad <NUM> disposed in the second area of the edge area, and the other end portion <NUM> formed to the third area of the edge area.

A first chamfered surface <NUM> and a second chamfered surface <NUM> may be formed in the edge area <NUM> of the glass substrate <NUM>, respectively. Specifically, the first chamfered surface <NUM> may be formed by chamfering a corner where the front surface <NUM> and the side surface <NUM> of the glass substrate <NUM> are adjacent to each other. The second chamfered surface <NUM> may be formed by chamfering a corner where the back surface <NUM> and the side surface <NUM> of the glass substrate <NUM> are adjacent to each other. Accordingly, the first chamfered surface <NUM> is positioned between the first and second areas of the edge area, and the second chamfered surface <NUM> is positioned in the first and third areas of the edge area.

The first chamfered surface <NUM> may prevent the TFT circuit formed on the front surface <NUM> of the glass substrate <NUM> from being damaged by a laser beam when processing the side wirings <NUM> by irradiating the laser beam. The process of processing the side wirings <NUM> using the laser beam will be described later.

<FIG> is a view illustrating angles of chamfered surfaces formed in edge areas corresponding to a front surface and a back surface of the glass substrate, respectively.

Referring to <FIG>, the first chamfered surface <NUM> may be formed at a first angle α1 with respect to the front surface <NUM> of the glass substrate <NUM>, and the second chamfered surface <NUM> may be formed at a second angle α2 with respect to the back surface <NUM> of the glass substrate <NUM>.

The first angle α1 may be an acute angle, for example, an angle of about <NUM> degrees, for example, <NUM> degrees ± <NUM> degrees. The second angle α2 may also be an acute angle like the first angle α1, for example, an angle of about <NUM> degrees, for example, <NUM> degrees ± <NUM> degrees.

For example, the first and second chamfered surfaces <NUM> and <NUM> may form the first angle α1 and the second angle α2 at the same angle so as to be symmetrical with each other in consideration of processing efficiency. That is, both the first and second angles α1 and α2 may be set to <NUM> degrees, or both may be set to the acute angle, but may be set to the same angle.

However, the first and second angles α1 and α2 do not necessarily have to be formed at the same angle, and the first and second angles α1 and α2 may be formed differently according to the conditions or environment in which the glass substrate <NUM> is installed.

As the first and second chamfered surfaces <NUM> and <NUM> are formed in the edge area <NUM> of the glass substrate <NUM>, handleability of the glass substrate <NUM> may be improved as follows.

In a case in which there is no chamfered surface in the edge area <NUM> of the glass substrate <NUM>, if the corner of the glass substrate contacts a glass substrate fixing jig (not illustrated) when the glass substrate is aligned or fixed, breakage such as chipping is likely to occur at a sharp rectangular corner of the glass substrate. However, when the first and second chamfered surfaces <NUM> and <NUM> are formed in the edge area <NUM> as in an embodiment of the disclosure, the sharp rectangular structure is removed from the edge area <NUM>, which may result in significantly reducing possibility of breakage even if the edge area <NUM> contacts the jig.

In addition, in a case in which the glass substrate <NUM> is dropped, if there is no chamfered surface, the chipping may occur at the rectangular corner of the edge area as the glass substrate is deformed at the moment when the glass substrate collides with a bottom surface, but if there is the chamfered surface in the edge area <NUM>, the frequency of chipping may be significantly reduced.

In addition, the glass substrate made of glass and the side wiring made of metal differ from each other in thermal strain. Accordingly, in the case in which there is no chamfered surface, due to a difference in the thermal strain between the glass substrate and the side wiring, when a part of the side wiring existing on the front surface <NUM> of the glass substrate and a part of the side wiring existing on the side surface of the glass substrate are expanded, the side wiring is lifted up, which may result in reducing adhesion between the glass substrate and the side wiring, and as a result, there is a problem that a crack occurs in the side wiring in the long term.

However, in the case in which there is the chamfered surface in the edge area as in an embodiment of the disclosure, a stress concentration generated by the chamfered surface is low, and the reduction in the adhesion of the side wiring closely contacted to the glass substrate and the crack generated in the side wiring may be significantly reduced.

Meanwhile, although not illustrated in the drawing, a lower end portion <NUM> of each side wiring may be electrically connected to another connection pad (not illustrated) or another driving element (not illustrated) formed in the third area of the edge area.

<FIG> is a plan view illustrating an example in which an insulating layer is formed on a surface of the glass substrate, and the side wirings are omitted.

Referring to <FIG>, the remaining portion except for a portion of the edge area <NUM> of the front surface <NUM> of the glass substrate <NUM> may be covered with an insulating layer <NUM>. In addition, the plurality of connection pads <NUM> formed in the edge area <NUM> may be partially exposed by exposed grooves <NUM> of the insulating layer <NUM> so as to be connected to the side wirings <NUM>, respectively.

<FIG> is a perspective view illustrating an example in which a protective film covering the side wirings is formed in the edge area of the glass substrate and <FIG> is a cross-sectional view taken along a line IX-IX indicated in <FIG>.

The plurality of side wirings <NUM> may have a width of several tens of micrometers (µm) and a thickness of several micrometers, and may be formed with a very fine thickness. Therefore, the plurality of side wirings <NUM> may be easily damaged by an external structure during various processes such as movement or assembly of the glass substrate <NUM>.

Referring to <FIG>, a protective film <NUM> made of an insulating material may be formed in the edge area <NUM> to protect the plurality of side wirings <NUM>.

The protective film <NUM> may be formed to completely cover the side wirings <NUM>. In this case, because the protective film <NUM> covers the side wirings <NUM> and does not need to cover an area where the side wirings <NUM> are not formed, an upper end <NUM> and a lower end <NUM> of the protective film <NUM> may be formed in an uneven shape, respectively, as illustrated in <FIG>.

In addition, the protective film <NUM> may also be formed so as not to completely cover each side wiring <NUM> and to cover portions of the side wirings <NUM> formed on the first chamfered surface <NUM>, the side surface <NUM> of the glass substrate, and the second chamfered surface <NUM> except for the upper end portion <NUM> and the lower end portion <NUM> of each side wiring <NUM>.

In addition, the protective film <NUM> may also be formed to cover only a portion formed on the side surface <NUM> of the glass substrate among the entire portions of each side wiring <NUM>.

Hereinafter, after a process of manufacturing a display module according to the disclosure is briefly described, processes of manufacturing side wirings formed on the side surface of the glass substrate according to diverse embodiments will be described in detail.

<FIG> is a flowchart illustrating a main process of manufacturing a display module according to the disclosure and <FIG> is a schematic view illustrating an active area and an inactive area on the glass substrate.

Referring to <FIG>, a TFT layer is formed on a front surface of the glass substrate <NUM> (S1).

The TFT layer may be formed in the form of a film in which the TFT circuit area <NUM> (e.g., see <FIG>) for controlling an on/off of the LED, and the plurality of connection pads <NUM> (e.g., see <FIG>) electrically connected to the horizontal line and the vertical line, respectively, formed in the TFT circuit area to transmit signals to the TFT circuit area are formed together. As such, the TFT layer formed in the form of a film may be coupled to the front surface of the glass substrate <NUM>.

Referring to <FIG>, on the front surface of the glass substrate <NUM>, the TFT circuit area of the TFT layer on which the LED is mounted may be defined as an active area A1, and the remaining area except the active area A1 may be defined as an inactive area A2. In this case, the inactive area A2 may be an edge portion in the front surface of the glass substrate <NUM> including an area occupied by the plurality of connection pads <NUM> of the TFT layer.

After the TFT layer is formed on the front surface of the glass substrate <NUM>, the chamfered surfaces <NUM> and <NUM> (e.g., see <FIG>) are formed by processing the corners included in the inactive area A2 of the glass substrate <NUM> (S2).

The chamfered surfaces <NUM> and <NUM> may be formed at each corner of the edge area of the glass substrate <NUM> in which the side wirings <NUM> (e.g., see <FIG>) will be formed.

After the chamfered surfaces <NUM> and <NUM> are formed, the plurality of side wirings <NUM> electrically connected to the plurality of connection pads <NUM> disposed in the inactive area of the glass substrate in which the chamfered surfaces are formed are formed (S3). The plurality of connection pads <NUM> may be disposed only on the front surface of the glass substrate <NUM> (e.g., see <FIG>), but are not limited thereto and may be disposed in the edge area of the back surface of the glass substrate <NUM> (e.g., see <FIG>).

The plurality of side wirings <NUM> formed on the side surface of the glass substrate <NUM> may not be connected to each other and may be disposed at constant intervals or at almost constant intervals. In addition, the number of the plurality of side wirings <NUM> may be equal to or less than the number of LEDs mounted on the TFT layer.

The plurality of side wirings <NUM> may be formed by one of a laser patterning process, a sputtering process, a pad printing process, and an ink screening process.

The laser patterning process may be a process of forming a metal film in the edge area of the glass substrate and then irradiating a laser beam to the metal film to leave a part of the metal film formed by the side wirings and removing the remainder.

The pad printing process may be a process of forming side wirings by transferring a plurality of conductive ribbons to be used as the side wirings on one side of a pad having elasticity, and then pressing the pad to the edge area of the glass substrate.

The ink screening process may be a process of forming side wirings by conductive ink formed in the edge area of the glass substrate through a plurality of exposed holes when the conductive ink is applied onto a mask film after the mask film having the plurality of exposed holes formed along patterns of the plurality of side wirings is formed in the edge area of the glass substrate.

The sputtering process is a process of forming side wirings in the edge area of the glass substrate through exposed holes by sputtering after forming a mask film having a plurality of exposed holes formed along patterns of a plurality of side wirings in the edge area of the glass substrate.

As such, when the plurality of side wirings <NUM> are formed in the edge area of the glass substrate <NUM>, a plurality of LEDs are transferred from a wafer substrate on which the plurality of LEDs are arranged to the TFT layer of the glass substrate <NUM> (S4).

The LED transfer process may be performed through one of laser transfer, pick and place transfer, and roll transfer.

Hereinafter, a process of forming the plurality of side wirings <NUM> in the edge area <NUM> of the glass substrate <NUM> will be sequentially described with reference to <FIG> and <FIG>.

<FIG> is a flowchart illustrating a method for forming side wirings according to a first embodiment of the disclosure and <FIG> are views sequentially illustrating a process of forming side wirings on the glass substrate according to the first embodiment of the disclosure.

Referring to <FIG>, first and second chamfered surfaces <NUM> and <NUM> are formed in an edge area in which the side wirings <NUM> are formed among the edge areas of the glass substrate <NUM>. The first and second chamfered surfaces <NUM> and <NUM> may be formed by grinding corners of the edge area <NUM> with a grinding device (not illustrated) (S11).

Surfaces of the first and second chamfered surfaces <NUM> and <NUM> may also be formed smoothly through a polishing process so that the side wirings <NUM> to be formed on the first and second chamfered surfaces <NUM> and <NUM> may be in close contact with the first and second chamfered surfaces <NUM> and <NUM> without being separated from the first and second chamfered surfaces <NUM> and <NUM>.

Referring back to <FIG>, a masking film <NUM> is formed in the remaining area of the glass substrate <NUM> except for the edge area <NUM> of the glass substrate <NUM> (S12).

The masking film <NUM> may be formed to leave the edge area <NUM> in which the side wirings are to be formed and cover most of the glass substrate <NUM>. The masking film <NUM> may be formed of an adhesive tape in the form of a film that is easily separated from the glass substrate <NUM> or may be formed by applying masking ink.

In an embodiment, the masking film <NUM> is formed to cover an empty space between the connection pads <NUM> as illustrated in <FIG>. This may reduce a total processing time by reducing a removal area of a metal film <NUM> when the process of removing a portion of the metal film <NUM> (e.g., see <FIG>) is performed with a laser beam in the future.

Referring to <FIG>, the glass substrate <NUM>, which is not covered by the masking film <NUM>, is placed in a vacuum chamber (not illustrated) and sputtered in a vacuum atmosphere to form the metal film <NUM> having a predetermined thickness in the edge area <NUM> (S13).

Referring to <FIG>, when the formation of the metal film <NUM> is completed, the masking film <NUM> may be removed from the glass substrate <NUM> (S14).

Referring to <FIG>, using a laser beam irradiated from a laser beam irradiator <NUM> of a laser beam device (not illustrated), a portion to be used as the side wiring in the entire metal film <NUM> remains and the remaining portion is removed (S15).

In this case, the laser beam irradiator <NUM> moves to a processing start position and then irradiates the laser beam while moving a distance L1 from a tip of one end portion <NUM> of the metal film <NUM> to a substantially middle portion of the first chamfered surface <NUM> toward the side surface <NUM> of the glass substrate <NUM> along an X axis direction to remove a portion of the metal film <NUM>.

Subsequently, the glass substrate <NUM> is rotated by <NUM> degrees counterclockwise about a Y axis, and a position of the laser beam irradiator <NUM> is then set. The set position may be a position at which the metal film may be removed after the portion previously processed on the metal film <NUM>.

If the position of the laser beam irradiator <NUM> is set, the laser beam irradiator <NUM> irradiates the laser beam while moving a distance L2 from the substantially middle portion of the first chamfered surface <NUM> to a substantially middle portion of the second chamfered surface <NUM> along the X axis direction to remove another portion of the metal film <NUM>.

If the removal of another portion of the metal film <NUM> on the side surface <NUM> of the glass substrate <NUM> is completed, the glass substrate <NUM> is rotated again by <NUM> degrees counterclockwise about the Y axis, and the position of the laser beam irradiator <NUM> is then set.

If the position of the laser beam irradiator <NUM> is set, the laser beam irradiator <NUM> irradiates the laser beam while moving a distance L3 from the substantially middle portion of the second chamfered surface <NUM> to a tip of a back end portion <NUM> of the metal film <NUM> to remove the remaining portion of the metal film <NUM>.

Meanwhile, although the laser beam irradiator <NUM> is irradiated with the laser beam while moving in the X-axis direction during the metal film processing, the disclosure is not limited thereto and it is also possible to remove the metal film <NUM> by irradiating the laser beam from the laser beam irradiator <NUM> while the laser beam irradiator <NUM> is fixed and the glass substrate <NUM> is moved by a predetermined distance along the X axis.

In addition, in the above description, although it is described that the metal film <NUM> is removed while rotating the glass substrate <NUM> at a predetermined angle using one laser beam irradiator <NUM>, but the disclosure is not limited thereto and a portion of the metal film <NUM> may be removed using a laser beam irradiator for irradiating the laser beam toward the front surface of the glass substrate and an additional laser beam irradiator (not illustrated) for irradiating the laser beam toward the side surface of the glass substrate.

In this case, the process of removing the metal film <NUM> may be performed in a state in which the front surface of the glass substrate <NUM> is fixed to face upward as illustrated in FIG. 11A without the need to rotate the glass substrate <NUM>.

The additional laser beam irradiator may irradiate a laser beam toward the metal film <NUM> while moving from a lower side to an upper side along a Z axis to remove another portion of the metal film <NUM>. In this case, a movement upper limit of the additional laser beam irradiator is limited to the substantially middle portion of the first chamfered surface <NUM> to prevent the TFT circuit formed on the front surface <NUM> of the glass substrate <NUM> from being damaged by the laser beam irradiated from the additional laser beam irradiator.

In addition to the above-described method of processing the metal film <NUM>, the metal film <NUM> may also be processed by fixing the glass substrate <NUM> to be inclined at a predetermined angle and moving the laser beam irradiator <NUM> in a linear direction. In this case, the TFT circuit formed on the front surface of the glass substrate <NUM> may not be damaged by the laser beam by appropriately setting the inclination angle of the glass substrate.

When the laser beam processing operation is completed so that only the portions to be used as the side wirings in the entire metal film <NUM> are left, the plurality of side wirings <NUM> may be formed in the edge area <NUM> of the glass substrate <NUM> as illustrated in <FIG> (S16).

Because the first and second chamfered surfaces are formed in the edge area of the glass substrate according to the embodiment of the disclosure, there are advantages as described below in terms of processability.

In a case in which there is a sharp rectangular corner with no chamfered surface in the edge area, masking using an adhesive tape in the form of a film has a problem that it is difficult to adhere the adhesive tape to the rectangular corner of the edge area due to the low flexibility of the adhesive tape, and masking using masking ink has a problem that agglomeration occurs severely at the corner portion. On the contrary, when the chamfered surface is formed in the edge area <NUM>, the adhesive tape may be easily adhered and an agglomeration phenomenon of the masking ink may be significantly reduced as compared with the case in which there is no chamfered surface in the edge area.

In the case in which the metal film <NUM> is patterned by irradiating the laser beam to the side surface <NUM> of the glass substrate <NUM>, because the laser beam is processed only to a specific area of the first chamfered surface <NUM> without processing the front surface of the glass substrate having the TFT circuit, it is possible to fundamentally prevent the damage of the TFT circuit due to the laser beam.

The sputtering process for forming the metal film <NUM> in the edge area <NUM> is performed after arranging a target (not illustrated) and a deposition surface (the side surface <NUM> of the glass substrate <NUM>) perpendicularto each other. In this case, in the case in which there is no chamfered surface in the edge area, at the time of side sputtering, there is a problem that metal deposition is not performed properly or metal is not deposited to a desired thickness in the edge areas existing in the front surface and the back surface of the glass substrate. However, in the case in which there is the chamfered surface in the edge area as in the embodiment of the disclosure, because metal deposition is performed to the chamfered surface to a desired thickness, the side wirings <NUM> formed by being patterned from the metal film <NUM> may have good quality.

Hereinafter, diverse side wiring forming methods for forming side wirings on the glass substrate <NUM> in a method different from the method for forming side wirings according to the first embodiment of the disclosure described above will be described.

<FIG> is a flowchart illustrating a method for forming side wirings according to a second embodiment of the disclosure and <FIG> are views sequentially illustrating a process of forming side wirings on the glass substrate according to the second embodiment of the disclosure.

First, the first and second chamfered surfaces <NUM> and <NUM> may be formed in edge areas in which the side wirings <NUM> are to be formed among the edge areas of the glass substrate <NUM>. The first and second chamfered surfaces <NUM> and <NUM> may be formed by grinding the corners of the edge area <NUM> (e.g., see <FIG>) with a grinding device (not illustrated) as described above (S21). In this case, surfaces of the first and second chamfered surfaces <NUM> and <NUM> may also be formed smoothly through a polishing process so that the side wirings <NUM> to be formed on the first and second chamfered surfaces <NUM> and <NUM> may be closely adhered to the first and second chamfered surfaces <NUM> and <NUM> without being separated from the first and second chamfered surfaces <NUM> and <NUM>.

In this case, as illustrated in <FIG>, a height h1 of the first chamfered surface <NUM> may be less than about <NUM>% with respect to a thickness t of the glass substrate <NUM>, and a height h2 of the second chamfered surface <NUM> may also be less than about <NUM>% with respect to the thickness t of the glass substrate <NUM>. For example, when the thickness of the glass substrate is about <NUM>, the heights h1 and h2 of the first and second chamfered surfaces <NUM> and <NUM> may be about <NUM> to <NUM>, respectively.

In addition, the heights h1 and h2 of the first and second chamfered surfaces <NUM> and <NUM> may be the same or different. When the heights h1 and h2 of the first and second chamfered surfaces <NUM> and <NUM> are different, the height h1 of the first chamfered surface <NUM> may be smaller than the height h2 of the second chamfered surface <NUM>. The heights h1 and h2 of the first and second chamfered surfaces <NUM> and <NUM> may be the same as or different from each other at less than <NUM>% with respect to the thickness t of the glass substrate <NUM>. For example, the height h1 of the first chamfered surface <NUM> may be <NUM>±<NUM>, and the height h2 of the second chamfered surface <NUM> may be <NUM>±<NUM>.

The thickness of the glass substrate <NUM> and the heights of the first and second chamfered surfaces <NUM> and <NUM> according to third to fifth embodiments described later, as well as the first embodiment described above, may also be formed in the same manner as the second embodiment.

After the first and second chamfered surfaces <NUM> and <NUM> are processed in the edge area of the glass substrate <NUM>, a plurality of conductive ribbons <NUM> disposed on a carrier film <NUM> are prepared as illustrated in <FIG> (S22).

The plurality of conductive ribbons <NUM> are members used later as the side wirings <NUM> (e.g., see <FIG>), and may be made of a conductive metal material having a predetermined length and thickness. For example, the plurality of conductive ribbons <NUM> may be formed through a process of applying (or printing) silver paste to one surface of the carrier film <NUM> and curing the same for a predetermined time.

The plurality of conductive ribbons <NUM> may be disposed on the carrier film <NUM> at a constant width and gap g. The width and gap g of the plurality of conductive ribbons <NUM> may be formed in consideration of the gap of the plurality of first and second connection pads <NUM> and <NUM> (e.g., see <FIG>) disposed to be adjacent to the first and second chamfered surfaces <NUM> and <NUM>, respectively, along the front surface <NUM> and the back surface <NUM> of the glass substrate <NUM>.

The plurality of conductive ribbons <NUM> may be formed to have a length L4 to electrically connect the first and second connection pads <NUM> and <NUM>.

Referring to <FIG>, after the carrier film <NUM> is disposed so that the plurality of conductive ribbons <NUM> face the edge area of the glass substrate <NUM>, a thermal compression process is performed on the edge area of the glass substrate <NUM> so that the conductive ribbons <NUM> are connected to the first and second connection pads <NUM> and <NUM> as illustrated in <FIG> (S23).

In this case, the carrier film <NUM> is pressed to a predetermined temperature in various directions such that a back surface of the carrier film <NUM> surrounds the edge area of the glass substrate <NUM>.

The plurality of conductive ribbons <NUM> may be physically and firmly attached to the first and second connection pads <NUM> and <NUM> by covering the first and second connection pads <NUM> and <NUM> with an upper end portion 239c and a lower end portion 239e, respectively, through the thermal compression process, and the remaining portions 239a, 239b, 239d of the conductive ribbons <NUM> may be firmly attached to the side surface <NUM> of the glass substrate <NUM> and the first and second chamfered surfaces <NUM> and <NUM>, respectively. When the carrier film <NUM> is removed, the plurality of conductive ribbons <NUM> remain in the edge area of the glass substrate <NUM> as illustrated in <FIG>, and the plurality of conductive ribbons <NUM> may be cured by heating to a predetermined temperature for a predetermined time or may be cured at room temperature to form side wirings <NUM> (S25).

<FIG> is a flowchart illustrating a method for forming side wirings according to a third embodiment of the disclosure and <FIG> are views sequentially illustrating a process of forming side wirings on the glass substrate according to the third embodiment of the disclosure.

Similarly to the first embodiment described above, a method for forming side wirings according to the third embodiment of the disclosure also forms the first and second chamfered surfaces <NUM> and <NUM> by processing the corners of the edge area of the glass substrate (S31).

Subsequently, a mask film <NUM> having a plurality of exposed holes <NUM> as illustrated in <FIG> is formed in the edge area of the glass substrate <NUM> as illustrated in <FIG> (S32).

In this case, the mask film <NUM> may be formed by applying liquid non-conductive ink to the edge area of the glass substrate <NUM> by, for example, screen printing.

In addition, the mask film <NUM> may be formed by mechanically or laser-processing a tape or film made of resin or metal, and a photosensitive film may be exposed, developed and manufactured, and then attached to the edge area of the glass substrate.

The plurality of exposed holes <NUM> may be formed in consideration of the shape of the side wirings as holes for forming the side wirings <NUM> (e.g., see <FIG>). For example, the constant width and gap g of the plurality of exposed holes <NUM> are formed in consideration of the gap of the plurality of connection pads <NUM> and <NUM> disposed to be adjacent to the first and second chamfered surfaces <NUM> and <NUM>, respectively, along the front surface <NUM> and the back surface <NUM> of the glass substrate <NUM>.

The plurality of exposed holes <NUM> may be formed to have a length L5 such that the side wirings <NUM> may electrically connect the first and second connection pads <NUM> and <NUM>.

Referring to <FIG>, the mask film <NUM> formed in the edge area of the glass substrate <NUM> is disposed so that an upper end portion 400a and a lower end portion 400b completely cover the first and second connection pads <NUM> and <NUM>, respectively.

In this case, portions of the first and second connection pads <NUM> and <NUM>, the side surface <NUM> of the glass substrate, and the first and second chamfered surfaces <NUM> and <NUM> may be simultaneously exposed through the exposed holes <NUM>. Accordingly, the shape of the side wiring <NUM> to be formed later may be the same as the shape of the exposed hole <NUM>.

Referring to <FIG>, after the mask film <NUM> is formed, a sputtering process is performed so that a metal film 241a may be deposited and formed on portions corresponding to the plurality of exposed holes <NUM> (S33).

When the sputtering process is performed, the metal film 241a is deposited and formed on the exposed portions in the edge area of the glass substrate <NUM> through the plurality of exposed holes <NUM> as illustrated in <FIG>, and a metal film 241b may also be deposited and formed on a surface of the mask film <NUM>.

Thereafter, the mask film <NUM> may be removed from the edge area of the glass substrate <NUM> by using a solvent capable of melting the mask film <NUM> or by heating the mask film <NUM> with heat of a predetermined temperature (S34).

Accordingly, when the mask film <NUM> and the metal film 241b formed on the surface of the mask film <NUM> are separated from the glass substrate <NUM>, the metal film 241a deposited in the edge area of the glass substrate <NUM> through the plurality of exposed holes <NUM> remains in the edge area of the glass substrate <NUM> as illustrated in <FIG>.

The metal film 241a may be used as the side wirings <NUM> that physically and electrically connect the first and second connection pads <NUM> and <NUM> (S35).

In the process of forming the side wirings according to the third embodiment of the disclosure, the sputtering process is performed after the mask film <NUM> is formed, but it is also possible to form the side wirings through an ink screening process instead of the sputtering process. In such an ink screening process, when conductive ink is applied to the entire mask film <NUM> and applied while applying a predetermined pressure with a scraper, the conductive ink may be formed in close contact with the edge area of the glass substrate through the plurality of exposed holes <NUM>. The plurality of side wirings thus formed may have a predetermined hardness through a process of curing at room temperature or a temperature higher than room temperature.

<FIG> is a flowchart illustrating a method for forming side wirings according to a fourth embodiment of the disclosure and <FIG> are views sequentially illustrating a process of forming side wirings on the glass substrate according to the fourth embodiment of the disclosure.

Similarly to the first embodiment described above, a method for forming side wirings according to the fourth embodiment of the disclosure also forms the first and second chamfered surfaces <NUM> and <NUM> by processing the corners of the edge area of the glass substrate (S41).

After the first and second chamfered surfaces <NUM> and <NUM> are processed in the edge area of the glass substrate <NUM> as described above, an ink transfer plate <NUM> having a plurality of recesses in which patterns such as a plurality of conductive ribbons <NUM> are formed is prepared as illustrated in <FIG>. Conductive ink is applied to the recesses of the ink transfer plate <NUM> and a three-dimensional pad <NUM> is pressed and adhered to the ink transfer plate <NUM> to transfer the conductive ink of the ink transfer plate <NUM> to the three-dimensional plate <NUM> such that the plurality of conductive ribbons <NUM> may be formed on one side surface of the three-dimensional pad <NUM> (S42). In this case, the plurality of conductive ribbons <NUM> may be disposed on the three-dimensional pad <NUM> at a constant width and gap g.

The width and gap g of the plurality of conductive ribbons <NUM> formed on the three-dimensional pad <NUM> may be formed in consideration of the gap of the plurality of connection pads <NUM> and <NUM> disposed to be adjacent to the first and second chamfered surfaces <NUM> and <NUM>, respectively, along the front surface <NUM> and the back surface <NUM> of the glass substrate <NUM>. The plurality of conductive ribbons <NUM> may be formed to have a length L6 to electrically connect the first and second connection pads <NUM> and <NUM>.

The three-dimensional pad <NUM> may be formed in a shape having a predetermined volume and may be formed of a material having an elastic force that a shape is deformed by a force applied from the outside and then restored to an original form when the force is removed.

Referring to <FIG>, after the three-dimensional pad <NUM> is disposed so that the plurality of conductive ribbons <NUM> face the edge area of the glass substrate <NUM>, a pad printing process of bringing the three-dimensional pad <NUM> into close contact with the edge area <NUM> of the glass substrate <NUM> and then pressing the three-dimensional pad <NUM> at a predetermined pressure is performed so that the plurality of conductive ribbons <NUM> are connected to the first and second connection pads <NUM> and <NUM> as illustrated in <FIG> (S43).

Through the pad printing process, the plurality of conductive ribbons <NUM>, which are not fully cured, that is, may maintain their shape without flowing down, may be firmly attached to the edge area of the glass substrate <NUM>, and may physically and electrically connect the first and second connection pads <NUM> and <NUM> at the same time.

Subsequently, when the three-dimensional pad <NUM> is separated from the edge area of the glass substrate <NUM> while removing the pressure applied to the three-dimensional pad <NUM>, the plurality of conductive ribbons <NUM> remain in the edge area <NUM> of the glass substrate <NUM> as illustrated in <FIG>. In this state, the plurality of conductive ribbons <NUM> may be cured by heating to a predetermined temperature for a predetermined time or cured at room temperature to form the side wirings <NUM> (S44).

<FIG> is a flowchart illustrating a method for forming side wirings according to a fifth embodiment of the disclosure and <FIG> are views sequentially illustrating a process of forming side wirings on the glass substrate according to the fifth embodiment of the disclosure.

Similarly to the first embodiment described above, a method for forming side wirings according to the fifth embodiment of the disclosure also forms the first and second chamfered surfaces <NUM> and <NUM> by processing the corners of the edge area of the glass substrate (S51).

Subsequently, conductive ink is applied to the edge area <NUM> of the glass substrate <NUM> through a three-dimensional (3D) inkjet printing method (S52). Hereinafter, a 3D inkjet printing process will be described with reference to <FIG>.

Referring to <FIG>, a nozzle <NUM> of a 3D inkjet printing apparatus (not illustrated) is set to an initial position. Here, for the convenience of description, the initial position of the nozzle <NUM> may be defined as a position located on the upper side of the first connection pad <NUM> with the upper surface <NUM> of the glass substrate <NUM> disposed toward the nozzle <NUM>. The nozzle <NUM> may discharge liquid conductive ink while moving along the X, Y, and Z axes.

When the nozzle <NUM> is set to the initial position, the nozzle <NUM> discharges the conductive ink while moving toward the side surface <NUM> of the glass substrate <NUM>, and discharges the conductive ink so as to cover a portion of the first connection pad <NUM> and the first chamfered surface <NUM> as illustrated in <FIG>. Accordingly, the conductive ink discharged from the nozzle <NUM> may form a first portion 245a forming a portion of the side wiring as illustrated in <FIG>.

Subsequently, the glass substrate <NUM> is rotated by <NUM> degrees counterclockwise as illustrated in <FIG>. In this case, because the conductive ink has a predetermined viscosity, the first portion 245a may maintain its shape without flowing down.

The nozzle <NUM> discharges the conductive ink while moving toward the back surface <NUM> of the glass substrate <NUM> from a position where an end portion of the first portion 245a may be covered or contacted and discharges the conductive ink so as to cover a portion of the second chamfered surface <NUM> as illustrated in <FIG>. Accordingly, the conductive ink discharged from the nozzle <NUM> may form a second portion 245b forming a portion of the side wiring.

Subsequently, the glass substrate <NUM> is rotated by <NUM> degrees counterclockwise as illustrated in <FIG>. In this case, as the conductive ink has a predetermined viscosity, the first and portions 245a and 245b may maintain their shape without flowing down.

The nozzle <NUM> discharges the conductive ink while moving in a direction opposite to the side surface <NUM> of the glass substrate <NUM> from a position where an end portion of the second portion 245b may be covered or contacted and discharges the conductive ink so as to cover a portion of the second connection pad <NUM> as illustrated in <FIG>. Accordingly, the conductive ink discharged from the nozzle <NUM> may form a third portion 245c forming a portion of the side wiring.

As described above, the first to third portions 245a, 245b, and 245c discharged to the edge area of the glass substrate <NUM> by the nozzle <NUM> may be cured by heating to a predetermined temperature for a predetermined time or cured at room temperature to form one side wiring <NUM> as illustrated in <FIG> (S53).

For convenience of description, the 3D inkjet printing apparatus is described as having one nozzle <NUM>, but is not limited thereto, and may include a plurality of nozzles to form a plurality of side wirings by simultaneously discharging the conductive ink from each nozzle.

In addition, in the fifth embodiment of the disclosure, it is described that the glass substrate <NUM> is rotated by <NUM> degrees counterclockwise and the conductive ink is then discharged while moving the nozzle <NUM>, but the disclosure is not limited thereto, and the glass substrate <NUM> is not rotated, and the nozzle may be rotated <NUM> degrees clockwise and then moved by a predetermined distance, thereby discharging the conductive ink to the edge area of the glass substrate <NUM> to form the side wiring.

The above-described embodiments according to the disclosure have described a structure in which the side wirings are formed in one edge area among four edge areas of the glass substrate, but the disclosure is not limited thereto and it is also possible that the side wirings are arranged in two edge areas among the four edge areas of the glass substrate.

<FIG> and <FIG> are views illustrating diverse examples in which a plurality of side wirings are disposed on a pair of sides of the glass substrate, respectively.

<FIG> is a plan view of a glass substrate 100a, and illustrates an example in which the glass substrate 100a is formed in a rectangle.

Referring to <FIG>, a plurality of side wirings 240a and 240b may be formed in a lower edge area 120a and an upper edge area 120b, respectively, corresponding to a pair of long sides facing each other (or disposed in parallel with each other) of the glass substrate 100a.

Chamfered surfaces 121a and 121b may be formed in the lower edge area 120a and the upper edge area 120b of the glass substrate 100a, respectively. The chamfered surfaces 121a and 121b illustrated in <FIG> are processed and formed at corners adjacent to a front surface of the glass substrate 100a, and although not illustrated in the drawing, chamfered surfaces corresponding to the chamfered surfaces 121a and 121b may be formed on a back surface of the glass substrate 100a, respectively.

In this case, a plurality of connection pads 111a disposed in the lower edge area 120a of the glass substrate 100a may be electrically connected to a plurality of gate lines of the TFT circuit, respectively, and a plurality of connection pads 111b disposed in the upper edge area 120b may be electrically connected to a plurality of data lines of the TFT circuit, respectively.

In contrast, the plurality of connection pads 111a disposed in the lower edge area 120a of the glass substrate 100a may be electrically connected to the plurality of data lines of the TFT circuit, respectively, and the plurality of connection pads 111b disposed in the upper edge area 120b may be electrically connected to the plurality of gate lines of the TFT circuit, respectively.

<FIG> is a plan view of a glass substrate 100b, and illustrates an example in which the glass substrate 100b is formed in a rectangle.

Referring to <FIG>, a plurality of side wirings 240c and 240d may be formed in a left edge area 120c and a right edge area 120d, respectively, corresponding to a pair of short sides facing each other (or disposed in parallel with each other) of the glass substrate 100b.

Chamfered surfaces 121c and 121d may be formed in the left edge area 120c and the right edge area 120d of the glass substrate 100b, respectively. The chamfered surfaces 121c and 121d illustrated in <FIG> are processed and formed at corners adjacent to a front surface of the glass substrate 100b, and although not illustrated in the drawing, chamfered surfaces corresponding to the chamfered surfaces 121c and 121d may be formed on a back surface of the glass substrate 100b, respectively.

In this case, a plurality of connection pads 111c disposed in the left edge area 120c of the glass substrate 100b may be electrically connected to a plurality of gate lines of the TFT circuit, respectively, and a plurality of connection pads 111d disposed in the right edge area 120d may be electrically connected to a plurality of data lines of the TFT circuit, respectively.

In contrast, the plurality of connection pads 111c disposed in the left edge area 120c of the glass substrate 100b may be electrically connected to the plurality of data lines of the TFT circuit, respectively, and the plurality of connection pads 111d disposed in the right edge area 120d may be electrically connected to the plurality of gate lines of the TFT circuit, respectively.

<FIG> is a plan view of a glass substrate 100c, and illustrates an example in which the glass substrate 100c is formed in a rectangle.

Referring to <FIG>, a plurality of side wirings 240b and 240d may be formed in the upper edge area 120b and the right edge area 120d, respectively, corresponding to the long side and the short side of the glass substrate 100c adjacent to each other.

The chamfered surfaces 121c and 121d may be formed in the upper edge area 120b and the right edge area 120d of the glass substrate 100c, respectively. The chamfered surfaces 121c and 121d illustrated in <FIG> are processed and formed at corners adjacent to a front surface of the glass substrate 100c, and although not illustrated in the drawing, chamfered surfaces corresponding to the chamfered surfaces 121c and 121d may be formed on a back surface of the glass substrate 100c, respectively.

In this case, a plurality of connection pads 111b disposed in the upper edge area 120b of the glass substrate 100c may be electrically connected to a plurality of gate lines of the TFT circuit, respectively, and a plurality of connection pads 111d disposed in the right edge area 120d may be electrically connected to a plurality of data lines of the TFT circuit, respectively.

In contrast, the plurality of connection pads 111b disposed in the upper edge area 120b of the glass substrate 100c may be electrically connected to the plurality of data lines of the TFT circuit, respectively, and the plurality of connection pads 111d disposed in the right edge area 120d may be electrically connected to the plurality of gate lines of the TFT circuit, respectively.

<FIG> is a plan view of a glass substrate 100d, and illustrates an example in which the glass substrate 100d is formed in a rectangle.

Referring to <FIG>, a plurality of side wirings 240a and 240c may be formed in the lower edge area 120a and the left edge area 120c, respectively, corresponding to the long side and the short side of the glass substrate 100d adjacent to each other.

Chamfered surfaces 121a and 121c may be formed in the lower edge area 120a and the left edge area 120c of the glass substrate 100d, respectively. The chamfered surfaces 121a and 121c illustrated in <FIG> are processed and formed at corners adjacent to a front surface of the glass substrate 100d, and although not illustrated in the drawing, chamfered surfaces corresponding to the chamfered surfaces 121a and 121c may be formed on a back surface of the glass substrate 100d, respectively.

In this case, a plurality of connection pads 111a disposed in the lower edge area 120a of the glass substrate 100d may be electrically connected to a plurality of gate lines of the TFT circuit, respectively, and a plurality of connection pads 111c disposed in the left edge area 120c may be electrically connected to a plurality of data lines of the TFT circuit, respectively.

In contrast, the plurality of connection pads 111a disposed in the lower edge area 120a of the glass substrate 100d may be electrically connected to the plurality of data lines of the TFT circuit, respectively, and the plurality of connection pads 111c disposed in the left edge area 120c may be electrically connected to the plurality of gate lines of the TFT circuit, respectively.

<FIG> is a plan view of a glass substrate 100e and illustrates an example in which the glass substrate 100e is in a square, and similarly to the glass substrate 100d illustrated in <FIG>, the chamfered surfaces 121a and 121c may be formed and the plurality of side wirings 240a and 240b may be disposed in the lower and left edge areas 120a and 120c corresponding to adjacent sides, respectively.

In addition, the glass substrate may be formed in the square as illustrated in <FIG>, but is not limited thereto, and it is also possible that the four sides are formed in a proportion close to the square.

<FIG> illustrate that the chamfered surfaces are processed and formed only in the edge areas of the glass substrate 100a in which the plurality of side wirings are formed, but the disclosure is not limited thereto and it is of course also possible to process and form the chamfered surfaces in all of the edge areas corresponding to the four sides of the glass substrate. In this case, the arrangement of the side wirings may be selectively set for each edge area.

Although the embodiments of the disclosure have been illustrated and described hereinabove, the disclosure is not limited to the abovementioned specific embodiments, but may be variously modified by those skilled in the art to which the disclosure pertains without departing from the scope of the present invention as defined by the accompanying claims.

Claim 1:
A display module comprising:
a glass substrate (<NUM>) of a quadrangle type having a front surface (<NUM>) and a back surface (<NUM>) opposite to the front surface:
a thin film transistor, TFT, layer formed on the front surface (<NUM>) of the glass substrate (<NUM>)
a plurality of light emitting diodes, LEDs (<NUM>, <NUM>, <NUM>), mounted on the TFT layer;
a plurality of side wirings (<NUM>) formed at intervals in an edge area (<NUM>) of the glass substrate (<NUM>); and
a plurality of connection pads (<NUM>) formed in the edge area (<NUM>) and electrically connected to the plurality of side wirings (<NUM>),
wherein the edge area (<NUM>) comprises:
a first area corresponding to a side surface (<NUM>) of the glass substrate (<NUM>);
a second area adjacent to the side surface (<NUM>) of the glass substrate (<NUM>) in the front surface (<NUM>) of the glass substrate (<NUM>);
a third area adjacent to the side surface (<NUM>) of the glass substrate (<NUM>) in the back surface (<NUM>) of the glass substrate (<NUM>);
a first chamfered surface (<NUM>) formed at a corner at which the first area and the second area meet; and
a second chamfered surface (<NUM>) formed at a corner at which the first area and the third area meet, and
wherein each of the plurality of side wirings (<NUM>) is disposed along the second area, the first chamfered surface, the first area, the second chamfered surface, and the third area;
characterized by:
the display module further comprising
an insulating layer (<NUM>) having grooves (<NUM>) and disposed on the plurality of connection pads (<NUM>), the plurality of connection pads (<NUM>) formed in the edge area (<NUM>) being partially exposed by the grooves (<NUM>) of the insulating layer (<NUM>).