KR102423664B1 - Display module, display apparatus comprising the same and electrical appliance - Google Patents

Abstract

An exemplary embodiment of the present invention provides a display module including a display panel and a reinforcing substrate disposed under the display panel and made of a porous metal material.
The porous metal material has elasticity or shock absorption due to porosity while having a predetermined rigidity according to the metal material.
Accordingly, it is possible to prevent the bending stress applied to the display panel from being aggravated by the stress of the reinforcing substrate. Therefore, damage to the display panel due to the reinforcing substrate can be prevented.

Description

Display module, and display device and electronic device including the same

The present invention relates to a display module for outputting light for image display, and a display device and electronic device having the same.

Display devices are mobile communication terminals, electronic notebooks, e-books, PMP (Portable Multimedia Player), navigation, UMPC (Ultra Mobile PC), mobile phone, smart phone, tablet PC (Personal Computer), watch phone, electronic It is widely used for image display functions of various electronic devices such as pads, wearable devices, watch phones, portable information devices, navigation devices, vehicle control display devices, televisions, notebook computers, and monitors. Research to improve such a display device and an electronic device having the display device to be thinner, lighter, and lower in power consumption, etc. is continuing.

Examples of the display device include a liquid crystal display device (LCD), a plasma display panel device (PDP), a field emission display device (FED), and an electro-wetting display device (Electro-Wetting). Display device: EWD) and an electro-luminescence display device (ELDD), and the like.

On the other hand, the display device may be provided as a rollable device that can be repeatedly deformed by alternating a rolling type and an unrolling type.

In the case of having such a rollable display device, the electronic device can be installed in a relatively small space by the display device deformed in a rolling form, and can provide a relatively wide screen by the display device deformed in an unrolling form.

The rollable display device needs to be flexible enough to be deformed into a rolling shape, and yet have rigid enough to maintain a flat surface in an unrolled shape.

To this end, the rollable display device may include a reinforcing member disposed under the display panel.

However, when bending stress according to the rolling shape is applied to the reinforcing member and the display panel, since the reinforcing member is stiffer than the display panel, the bending stress applied to the display panel may be amplified due to the stress of the reinforcing member. Accordingly, when bending stress is repeatedly applied, there is a problem that the reinforcing member may cause damage to the display panel.

In addition, since the reinforcing member is made of a rigid material, it is not easy to pattern the reinforcing member, so there is a problem in that it is difficult to reduce the bending stress through the thickness control of the reinforcing member.

An object of the present invention is to provide a display module capable of preventing damage to a display panel due to the reinforcing substrate while having a reinforcing substrate for securing rigidity, and a display device and electronic device including the same.

Another object of the present invention is to provide a display module capable of reducing bending stress, and a display device and electronic device including the same.

The objects of the present invention are not limited to the objects mentioned above, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the appended claims.

An exemplary embodiment of the present invention provides a display module including a display panel and a reinforcing substrate disposed under the display panel and made of a porous metal material.

The porous metallic material has elasticity or shock absorption due to porosity while having a predetermined rigidity according to the metallic material.

Accordingly, it is possible to prevent the bending stress applied to the display panel from being aggravated by the stress of the reinforcing substrate. Therefore, damage to the display panel due to the reinforcing substrate can be prevented.

Since the reinforcing substrate has a single-layer structure of a porous metal material, thickness control is relatively easy. Accordingly, bending stress on the display panel and the reinforcing substrate may be reduced through a portion of the reinforcing substrate having a relatively thin thickness.

A display module according to an embodiment of the present invention includes a reinforcing substrate disposed under a display panel and made of a porous metal material. The porous metal material has elasticity or shock absorption according to the porosity while having rigidity according to the metal material. Accordingly, the rigidity of the display module may be secured due to the reinforcing substrate, and damage to the display panel due to the reinforcing substrate may be prevented.

In addition, since the reinforcing substrate has a single-layer structure of a porous metal material, a reinforcing substrate having a different thickness for each region can be relatively easily provided. Accordingly, since the overall thickness of the display device may be reduced by a portion of the reinforcing substrate having a relatively thin thickness, bending stress may be reduced.

1 is a view showing an example of an electronic device according to an embodiment of the present invention.
FIG. 2 is a view showing an example of the inside of the storage case of FIG. 1 .
3 is an example of a display device provided in the electronic device of FIG. 1 .
4 is a view illustrating a display panel and a panel driver included in the display device of FIG. 3 .
FIG. 5 is a diagram illustrating an example of an equivalent circuit corresponding to the sub-pixel region of FIG. 4 .
FIG. 6 is a diagram illustrating an example of a part of a display area of the display device shown in FIG. 3 .
7 is a view showing the display module of FIG. 3 according to the first embodiment of the present invention.
8 is a view showing the display module of FIG. 3 according to a second embodiment of the present invention.
9 is a view showing the display module of FIG. 3 according to a third embodiment of the present invention.
10 is a view showing the display module of FIG. 3 according to a fourth embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

In addition, when it is described that a component is “connected”, “coupled” or “connected” to another component, the components may be directly connected or connected to each other, but other components are “interposed” between each component. It is to be understood that “or, each component may be “connected”, “coupled” or “connected” through another component.

Hereinafter, a display device and an electronic device having the same according to an embodiment of the present invention will be described with reference to the accompanying drawings.

First, an electronic device and a display device provided therein according to an embodiment of the present invention will be described.

1 is a view showing an example of an electronic device according to an embodiment of the present invention. FIG. 2 is a view showing an example of the inside of the storage case of FIG. 1 . 3 is an example of a display device provided in the electronic device of FIG. 1 .

As shown in FIG. 1 , the electronic device EA according to an embodiment of the present invention includes a rollable display device 10 having a rollable function.

The rollable display device 10 includes a display area AA through which light for image display is output.

The display area AA of the rollable display device 10 has a rolling type that is rotated and rolled from one corner corresponding to a predetermined rolling direction (RD), and an unrolling direction opposite to the rolling direction (UD; Unrolling Direction). ) and can be repeatedly deformed alternately in a flat unfolded unrolled form.

In addition, the electronic device EA further includes a rotating bar (21 in FIG. 2 ) fixed to one corner of the display device 10 and a storage case 20 for accommodating a portion deformed in a rolling form among the display device 10 . include

In addition, the electronic device EA may further include a support bar 30 fixed to the other corner of the display device 10 . Due to the weight of the support bar 30 , the other part of the unrolled shape of the display device 10 may be spread flat and it may be easy to maintain the flat shape.

As shown in FIG. 2 , the rotating bar 21 fixed to one corner of the display device 10 is accommodated inside the storage case 20 .

Although not shown in detail in FIG. 2 , both ends of the rotating bar 21 may be spaced apart from the outer wall of the storage case 20 by being connected to a fixing means (not shown) fastened to the inside of the storage case 20 . And, at least one of both ends of the rotary bar 21 is connected to a drive shaft of a motor (not shown), so that the rotary bar 21 can be rotated in the rolling direction RD or the unrolling direction UD.

Since one edge of the display device 10 is fixed to the rotation bar 21 , the display device 10 rotates together with the rotation bar 21 . Accordingly, the display device 10 may be transformed into a rolling shape that is rolled around the rotating bar 21 or may be transformed into an unrolled shape that is spread flat.

Since the rolling-type display device 10 is disposed around the rotating bar 21 , the minimum radius (MR) corresponding to the minimum circumference of a portion of the display device 10 deformed in the rolling form is the rotating bar 21 . greater than the radius of

In addition, a portion of the display device 10 that is deformed into a rolling shape is accommodated in the storage case 20 together with the rotating bar 21 . Accordingly, a portion of the display device 10 that is deformed into a rolling shape becomes an ineffective area that is not used for image display.

Another portion of the display device 10 that is deformed into an unrolled form is drawn out of the storage case 20 through an opening 22 penetrating the storage case 20 .

Accordingly, the other portion of the display device 10 that is deformed into an unrolled form is visually recognized to the outside, and thus becomes an effective area in which an image is substantially displayed.

As shown in FIG. 3 , the display device 10 according to an embodiment of the present invention may include a display module 10a and a housing 10b that accommodates and supports the display module 10a.

The display module 10a may include a display panel 100 including a display area AA emitting light LIGHT for image display, and a reinforcement substrate 200 disposed under the display panel 100 . .

In order for the display device 10 to have a rollable function, the display area AA of the display panel 100 is rotated in the rolling direction RD from one side corresponding to the rolling direction RD to be rolled and rolled and unrolled. It is repeatedly deformed alternately in an unrolled form that is flattened by rotating in the direction (UD).

In addition, the display device 10a may further include a first fixing area FX1 connected to one side of the display area AA corresponding to the rolling direction RD. The first fixed region FX1 is fastened to the rotating bar (21 in FIG. 2) disposed in the storage case (20 in FIG. 1).

In addition, when the electronic device EA includes the support bar 30 , the display device 10a has a second fixed area FX2 connected to the other side of the display area AA corresponding to the unrolling direction RD. may further include. The second fixing region FX2 is fastened to the support bar 30 .

The display panel 100 is flexible to include the display area AA that can be deformed into a rolling shape and an unrolling shape.

The display panel 100 includes a plurality of sub-pixel areas (SPA of FIG. 4 ) arranged in the display area AA and emitting respective lights for image display.

The reinforcing substrate 200 is for reinforcing the flexible display panel 100 . That is, the reinforcing substrate 200 is to provide a predetermined rigidity for maintaining the shape of the display panel 100 and to alleviate a physical impact on the display panel 100 .

According to an embodiment of the present invention, the reinforcing substrate 200 is made of a porous metal material 200'. The porous metallic material 200 ′ includes a sponge-shaped metallic material 201 and pores 202 distributed in the metallic material 201 . Accordingly, the reinforcing substrate 200 may have rigidity, elasticity, and shock absorption by the porous metal material 200 ′.

The reinforcing substrate 200 will be described in detail below.

The reinforcing substrate 200 may be fixed under the display panel 100 by an adhesive film (300 in FIG. 6 ).

The housing 10b is a middle frame ( 12), and a back cover 13 disposed under the middle frame 12 and fastened to the transparent cover 11 .

Each of the transparent cover 11, the middle frame 12, and the back cover 13 can be easily deformed into a rolling form and an unrolled form, and can be made of a soft material that is not easily damaged due to the stress caused by the deformation. have.

Although not shown in FIG. 3 , the transparent cover 11 may be fixed on the display panel 100 by a transparent adhesive member (not shown) disposed between the display panel 100 and the transparent cover 11 . For example, the transparent adhesive member may be formed of a pressure sensitive adhesive (PSA), an optical clear adhesive (OCA), an optical clear resin (OCR), or the like.

The middle frame 12 is disposed under the reinforcing substrate 200 , and supports the display panel 100 and the reinforcing substrate 200 .

The middle frame 12 may be fixed under the reinforcing substrate 200 by the adhesive pattern 14 .

The adhesive pattern 14 may be disposed between the reinforcing substrate 200 and the middle frame 12 and may correspond to both sides of the edges of the middle frame 12 .

The display device 10a may further include various circuit components 15 accommodated between the middle frame 12 and the back cover 13 and connected to the display panel 100 . For example, the circuit component 15 may include at least one circuit board on which the driving unit (GDR, DDR, TC of FIG. 4 ) of the display panel 100 is mounted. Alternatively, the circuit component 15 may further include at least one circuit board on which a host system for controlling the electronic device EA, a memory, and a power supply are mounted.

Alternatively, at least one circuit board on which the driving unit (GDR, DDR, TC in FIG. 4) of the display panel 100 and the host system for controlling the electronic device (EA), a memory and a power supply unit are mounted is the storage case 20 . can be placed within. In this case, the circuit component 15 disposed between the middle frame 12 and the back cover 13 is a flexible connecting circuit board (not shown) disposed inside the storage case 20 and the display panel 100 . It may include a circuit board (not shown).

In addition, although not shown in detail in FIG. 3 , the middle frame 12 may include a hole for drawing out a flexible circuit board (not shown) connected to the display panel 100 .

The back cover 13 accommodates the display panel 100 , the reinforcing substrate 200 , and the middle frame 12 provided in the display module 10a together with the transparent cover 11 .

Although not shown in detail in FIG. 3 , the housing 10b may further include a connecting means (not shown) disposed between the transparent cover 11 and the back cover 13 .

For example, the connecting means (not shown) for fastening between the transparent cover 11 and the back cover 13 may be implemented with an adhesive, a bolt and a nut, and a rail groove and a slide.

4 is a view illustrating a display panel and a panel driver included in the display device of FIG. 3 . FIG. 5 is a diagram illustrating an example of an equivalent circuit corresponding to the sub-pixel region of FIG. 4 . FIG. 6 is a diagram illustrating an example of a part of a display area of the display device shown in FIG. 3 .

As shown in FIG. 4 , the display device 10 includes a display panel 100 including a display area AA from which light for image display is output, and a panel driver supplying a driving signal to the display panel 100 . (TC, GDR, DDR).

The display panel 100 includes a plurality of sub-pixel areas SPA arranged in the display area AA, and signal lines GL and DL connected to the plurality of sub-pixel areas SPA. . The signal lines GL and DL of the display panel 100 transfer driving signals supplied from the panel drivers TC, GDR, and DDR to each sub-pixel area SPA.

When the display panel 100 displays a color image, each of the plurality of sub-pixel areas SPA emits light in a wavelength range corresponding to any one color among a plurality of different colors. Here, the plurality of colors may include red, green, and blue. Alternatively, the plurality of colors may further include white. To this end, the display panel 100 may include a color filter (not shown).

The signal lines GL and DL of the display panel 100 are connected to the gate line GL transmitting the scan signal SCAN of the gate driver GDR, and the data signal VDATA of the data driver DDR. It may include a data line DL.

When the display panel 100 includes a light emitting device (OLED of FIG. 5 and ED of FIG. 6 ) corresponding to each sub-pixel area SPA, the display panel 100 includes first and second light emitting devices for driving the light emitting devices. It may further include first and second driving power lines for transmitting the second driving powers VDD and VSS.

The panel drivers TC, GDR, and DDR include a gate driver (GDR) connected to the gate line GL of the display panel 100 and a data driver connected to the data line DL of the display panel 100 ( It may include a data driver (DDR) and a timing controller (TC) for controlling driving timings of the gate driver GDR and the data driver DDR, respectively.

The timing controller TC rearranges the digital video data RGB input from the outside to match the resolution of the display panel 100 , and supplies the rearranged digital video data RGB′ to the data driver DDR.

The timing controller TC performs the operation timing of the data driver DDR based on timing signals such as the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, the dot clock signal DCLK, and the data enable signal DE. A data control signal DDC for controlling , and a gate control signal GDC for controlling an operation timing of the gate driver GDR are supplied.

The gate driver GDR sequentially supplies the scan signal SCAN to the plurality of gate lines GL during one frame period for image display based on the gate control signal GDC. That is, the gate driver GDR supplies the scan signal SCAN to each gate line GL during each horizontal period corresponding to each gate line GL in one frame period. Here, the gate line GL may correspond to the sub-pixel areas SPA arranged in parallel in the horizontal direction among the plurality of sub-pixel areas SPA.

The data driver DDR converts the rearranged digital video data RGB' into an analog data voltage based on the data control signal DDC. The data driver DDR generates a data signal VDATA corresponding to each of the sub-pixel areas SPA corresponding to each gate line GL for each horizontal period based on the rearranged digital video data RGB' to the data line. (DL) is supplied.

As shown in FIG. 5 , each sub-pixel area SPA includes a light emitting device OLED and a pixel driving circuit (PDC) for supplying a driving signal to the light emitting device OLED.

For example, the pixel driving circuit PDC may include a driving transistor (DT), a switching transistor (ST), and a storage capacitor (Cst).

In addition, although not shown in FIG. 5 , each sub-pixel area SPA may further include a compensation circuit (not shown) for compensating for deterioration of at least one of the driving transistor DT and the light emitting device OLED. The compensation circuit may include at least one transistor (not shown) for sensing the degree of deterioration or supplying a reference power (not shown).

The driving transistor DT includes a first driving power line VDDL for supplying the first driving power VDD and a second driving power supply for supplying a second driving power VSS having a potential lower than that of the first driving power VDD. It is disposed in series with the light emitting device OLED between the lines VSSL.

That is, one end of the driving transistor DT is connected to the first driving power line VDDL, and the other end of the driving transistor DT is connected to one end of the light emitting device OLED. In addition, the other end of the light emitting device OLED is connected to the second driving power line VSSL.

The switching transistor ST is disposed between the data line DL supplying the data signal VDATA of each sub-pixel area SPA and the first node ND1 . The first node ND1 is a contact point between the gate electrode of the driving transistor DT and the switching transistor ST. In addition, the gate electrode of the switching transistor ST is connected to the gate line GL.

The storage capacitor Cst is disposed between the first node ND1 and the second node ND2 . The second node ND2 is a contact point between the driving transistor DT and the light emitting device OLED.

The operation of the pixel driving circuit PDC will be described as follows.

The switching transistor ST is turned on based on the scan signal SCAN of the gate line GL. At this time, the data signal VDATA of the data line DL is supplied to the gate electrode of the driving transistor DT and the storage capacitor Cst through the turned-on switching transistor ST and the first node ND1 .

The storage capacitor Cst is charged with the data signal VDATA.

The driving transistor DT is turned on based on the data signal VDATA and the charging voltage of the storage capacitor Cst, thereby generating a driving current corresponding to the data signal VDATA. Accordingly, the driving current by the turned-on driving transistor DT may be supplied to the light emitting device OLED.

As shown in FIG. 6 , the display module 10a includes a display panel 100 and a reinforcing substrate 200 .

The display panel 100 is formed on a support substrate 110 , a transistor array 120 disposed on the support substrate 110 , a light emitting array 130 disposed on the transistor array 120 , and a light emitting array 130 . It may include an encapsulation film 140 disposed thereon.

The support substrate 110 may be made of a flexible insulating material. For example, the support substrate 110 may include polyimide (PI), polycarbonate (PC), polyethyleneterephthalate (PET), polymethylpentene (PMP), polymethylmethacrylate (PMMA), polynorborneen (PNB), polyethylenapthanate (PEN), polyethersulfone (PES), and COS. (cycloolefin copolymer) may be made of any one of.

The transistor array 120 includes a pixel driving circuit (PDC of FIG. 5 ) corresponding to each of the plurality of sub-pixel areas SPA. As shown in FIG. 5 , the pixel driving circuit PDC is turned on/off based on the scan signal of the driving transistor DT and the gate line GL connected to the light emitting device OLED, and the data line DL is It may include a switching transistor ST that transmits the data signal VDATA to the gate electrode of the driving transistor DT and a storage capacitor Cst connected to the gate electrode of the driving transistor DT. The transistor array 120 further includes signal lines GL and DL connected to the pixel driving circuit PDC of each sub-pixel region SPC.

The transistor array 120 may further include a planarization layer 121 disposed on the support substrate 110 and flatly covering the pixel driving circuit PDC.

The light emitting array 130 may be disposed on the planarization layer 121 of the transistor array 120 .

The light emitting array 130 includes a light emitting device ED (OLED of FIG. 5 ) corresponding to each of the plurality of sub-pixel areas SPA.

Each light emitting device ED may include a first electrode 131 and a second electrode 132 that face each other, and a light emitting structure 133 disposed therebetween.

For example, the light emitting array 130 is disposed on the planarization layer 121 , the first electrode 131 corresponding to each sub-pixel area SPA, and the planarization layer 121 , and is disposed on each sub-pixel area SPA. ), the bank 134 covering the edge of the first electrode 131 , the light emitting structure 133 disposed on the first electrode 131 , and the bank 134 and the light emitting structure 133 . The second electrode 132 may be disposed.

The sealing film 140 is disposed on the light emitting array 130 and encapsulates the light emitting array 130 .

The sealing film 140 may have a structure in which a plurality of protective films 141 , 142 , and 143 made of different insulating materials or different thicknesses are sequentially stacked.

For example, the plurality of passivation layers 141 , 142 , 143 cover the second electrode 132 , are flatly disposed on the first passivation layer 141 and the first passivation layer 141 made of an inorganic insulating material, and are made of an organic insulating material. It may include a second passivation layer 142 made of, and a third passivation layer 143 disposed on the second passivation layer 142 and made of an inorganic insulating material.

Due to the sealing film 140 , penetration of moisture or oxygen into the light emitting array 130 may be delayed, and the influence of foreign substances may be reduced.

When the display device 10 has a touch input function, the display panel 100 may further include a touch electrode array 150 disposed on the sealing film 140 .

The touch electrode array 150 is for touch sensing, and detects a position where a touch operation is performed in the display area AA by sensing an element variable by a touch.

For example, the touch electrode array 150 may include first and second touch electrodes that cross each other. In this case, the position at which the touch operation is generated may be detected by detecting the position where the capacitance change occurs among the intersection points of the first and second touch electrodes.

In addition, the display panel 100 may further include a polarizing plate 160 disposed on the sealing film 140 to prevent reflection of external light.

In addition, the display panel 100 may further include an auxiliary substrate 170 disposed under the support substrate 110 .

The auxiliary substrate 170 is for increasing the rigidity of the support substrate 110 , and may be omitted depending on the material of the support substrate 110 .

The reinforcing substrate 200 may be fixed under the auxiliary substrate 170 through the adhesive film 300 .

On the other hand, the display panel 100 can be repeatedly deformed alternately in a rolling form and an unrolling form, and is provided with a ductility enough to prevent irreversible damage due to the repeated deformation, so that it is easily caused by an external physical impact. can be seriously damaged.

In order to reinforce the flexible display panel 100 , the conventional rollable display device includes a metal plate made of a stainless material that can be easily bent while blocking an external physical impact. In this case, when bending stress generated in the rolling display area BDA is applied to the metal plate and the display panel 100 , the bending stress applied to the display panel 100 is increased due to the stress of the relatively rigid metal plate, There is a problem in that the relatively soft display panel 100 is damaged.

To solve this problem, the display module 10a according to an embodiment of the present invention includes a reinforcing substrate 200 disposed under the display panel 100 and made of a porous metal material 200 ′.

As shown in FIG. 3 , the reinforcing substrate 200 may be formed in the form of a flat plate having a width greater than or equal to the display panel 100 . Due to the reinforcing substrate 200 , the display panel 100 may be entirely protected from physical impact, and the display panel 100 may be reinforced as a whole.

The reinforcing substrate 200 may be fixed under the display panel 100 through the adhesive film 300 disposed between the display panel 100 and the reinforcing substrate 200 .

For example, the adhesive film 300 may be formed of a pressure sensitive adhesive (PSA), an optical clear adhesive (OCA), an optical clear resin (OCR), or the like.

In addition, the reinforcing substrate 200 is made of a porous metal material 200'. Accordingly, the reinforcing substrate 200 may have rigidity, elasticity, and shock absorption by the porous metal material 200 ′.

The porous metallic material 200 ′ includes a sponge-shaped metallic material 201 and pores 202 distributed in the metallic material 201 .

The metal material 201 may be selected from any material having a predetermined rigidity. For example, the metal material 201 may be copper (Cu).

In addition, the porous metal material 200 ′ may have elasticity or shock absorption according to porosity by including the pores 202 distributed in the metal material 201 . Accordingly, the reinforcing substrate 200 made of the porous metal material 200 ′ may relieve the compressive force or tensile force according to the bending stress with the elasticity or shock absorption of the porous metal material 200 ′.

Therefore, it is possible to prevent the display panel 100 from being damaged due to the stress of the reinforcing substrate 200 subjected to bending stress.

In addition, since an external physical shock to the display panel 100 may be alleviated due to the reinforcement substrate 200 , the flexible display panel 100 may be protected from external physical shock.

In consideration of the shock absorption, elasticity, and rigidity of the reinforcing substrate 200 , the porosity of the porous metal material 200 ′ constituting the reinforcing substrate 200 may be 50% to 76%. Here, the porosity corresponds to the ratio of the voids 202 to the total volume of the porous metallic material 200 ′.

The elasticity or shock absorption of the porous metal material 200 ′ constituting the reinforcing substrate 200 corresponds to the absolute volume of the void 202 , and the rigidity of the porous metal material 200 ′ corresponds to the absolute volume of the metal material 201 . Accordingly, the reinforcing substrate 200 may have elasticity and rigidity corresponding to the thickness. Accordingly, the minimum value of the thickness of the reinforcing substrate 200 may be derived in consideration of the elasticity and rigidity of the reinforcing substrate 200 .

In addition, since the overall thickness of the display module 10a increases as the thickness of the reinforcing substrate 200 increases, the maximum value of the thickness of the reinforcing substrate 200 may be derived in consideration of the slimming of the display module 10a.

For example, the thickness of the reinforcing substrate 200 may be in the range of 70 μm to 200 μm.

As described above, according to an embodiment of the present invention, the flexible display panel 100 is disposed under the display panel 100 and provided with the reinforcing substrate 200 made of a flat plate shape of the porous metal material 200 ′. ) can be reinforced as a whole. That is, due to the reinforcing substrate 200 , a physical impact to the display panel 100 may be alleviated, and the shape of the display module 10a may be easily maintained.

In addition, since the reinforcing substrate 200 has elasticity due to porosity, it can be prevented that bending stress according to the rolling shape is added to the reinforcing substrate 200 . Accordingly, due to the bending stress and the stress of the reinforcing substrate 200 , cracks in the insulating layers 121 , 141 , 142 , and 143 of the display panel 100 ( 121 , 141 , 142 , and 143 in FIG. 6 ) and the signal wiring provided in the display panel 100 . Damage to the display panel 100 such as disconnection of the cables (GL and DL in FIG. 4 ) may be prevented.

On the other hand, the display module 10a provided in the rollable display device 10 is subjected to bending stress according to the rolling shape. Since the bending stress corresponds to the thickness of the display module 10a, as the thickness of the display module 10a decreases, the bending stress may be reduced.

However, since the reinforcing substrate 200 according to an embodiment of the present invention has a single-layer structure of the porous metal material 200', it is easier to deform into a shape including regions having different thicknesses than the metal plate.

Accordingly, the first, second, third and fourth embodiments of the present invention provide a display module 10a (EM1, EM2, EM3, EM4) capable of reducing rolling-type bending stress.

7 is a view showing the display module of FIG. 3 according to the first embodiment of the present invention.

As shown in FIG. 7 , the display device EM1 according to the first embodiment of the present invention is shown in FIG. 3 , except that it includes a plurality of grooves 210 disposed on the lower surface of the reinforcing substrate 200 . Since it is the same as the illustrated display device 10a, a redundant description will be omitted below.

7, the display module EM1 according to the first embodiment EM1 of the present invention is parallel to each other at a predetermined fixed distance interval (FDI) along the rolling direction (-X direction). A plurality of grooves 210 are disposed.

Each of the plurality of grooves 210 passes through at least a portion of the reinforcing substrate 200 .

The plurality of grooves 210 may be spaced apart from each other at a predetermined fixed interval FDI along the rolling direction.

The display module EM1 is provided in a rollable display device (10 in FIG. 2 ) that is deformed into a rolling shape that is rolled around a rotating bar (21 in FIG. 2 ). That is, the rollable display device 10 of the rolling type is disposed to surround the rotating bar 21 in layers, thereby forming at least one rotating layer around the rotating bar 21 . And, bending stress according to the rolling shape may be generated for each rotating layer.

Accordingly, the fixed distance FDI may be derived as a value smaller than the circumference of the rotating bar 21 . In this way, since at least one groove portion 210 may be disposed in each rotation layer, the bending stress of each rotation layer may be reduced.

As described above, according to the first embodiment (EM1) of the present invention, it includes a plurality of grooves 210 arranged at a predetermined fixed interval (FDI) along the rolling direction and penetrating a part of the reinforcing substrate 200 . . Since the thickness of the reinforcing substrate 200 is reduced by each of these grooves 210 , the thickness of the display module EM1 is reduced, so that bending stress can be alleviated.

Accordingly, the display module EM1 including the plurality of grooves 210 includes a region in which the bending stress is relieved at a predetermined fixed interval FDI, thereby reducing bending stress due to the rolling shape.

8 is a view showing the display module of FIG. 3 according to a second embodiment of the present invention.

As shown in FIG. 8 , in the display module EM2 according to the second embodiment of the present invention, the plurality of grooves 210 are arranged at a variable distance interval (VDI) that gradually becomes smaller in the rolling direction. Except for this, since it is the same as that of the first embodiment EM1 shown in FIG. 7 , a redundant description will be omitted below.

As shown in FIG. 8 , the plurality of groove portions 210 ′ provided in the display module EM2 according to the second embodiment EM2 of the present invention have variable intervals that gradually decrease along the rolling direction (-X direction). (VDI) is arranged parallel to each other along the rolling direction (-X direction).

As mentioned above, the rollable display device 10 of the rolling type is disposed to surround the rotating bar 21 in layers, thereby forming at least one rotating layer around the rotating bar 21 . At this time, among the rotation layers of the rollable display device 10 of the rolling type, any one rotation layer adjacent to the rotation bar 21 forms a smaller circumference than the rotation layer spaced apart from the rotation bar 21 .

Since the bending stress corresponds to the curvature, and the curvature is the reciprocal of the radius of curvature, a greater bending stress may be generated in any one of the rotation layers adjacent to the rotation bar 21 .

However, according to the second embodiment of the present invention, the groove portion 210 ′ is arranged at a smaller variable interval (VDI) in the rolling direction (-X) side adjacent to the rotating bar 21 and farther from the rotating bar 21 . On the side of the unrolling direction (X) that are spaced apart, they are arranged at a larger variable interval (VDI).

Accordingly, due to the groove portions 210 ′ disposed at a smaller variable interval VDI in the rotation layer adjacent to the rotation bar 21 , bending stress may be relieved even in the rotation layer adjacent to the rotation bar 21 .

9 is a view showing the display module of FIG. 3 according to a third embodiment of the present invention.

As shown in FIG. 9 , the display module EM3 according to the third embodiment of the present invention further includes an elastic member 230 that fills each of the plurality of grooves 210 and 210 ′. Since it is the same as the first embodiment EM1 illustrated in FIG. 7 and the second embodiment EM2 illustrated in FIG. 8 , a redundant description will be omitted below.

As shown in FIG. 9 , according to the third embodiment EM3 of the present invention, each groove 210 ( 210 ′ in FIG. 8 ) is filled with an elastic member 230 .

For example, the elastic member 230 may be made of an elastic material or a porous material.

Accordingly, the bending stress applied to the reinforcing substrate 200 may be relieved by the elasticity or shock absorption of the elastic member 230 .

In addition, the elastic member 230 may be made of an insulating material. In this way, defects such as electrical interference and short circuit due to the reinforcing substrate 200 made of a conductive metal material can be prevented.

10 is a view showing the display module of FIG. 3 according to a fourth embodiment of the present invention.

As shown in FIG. 10 , in the display module EM4 according to the fourth embodiment of the present invention, except that the elastic member 230 ′ of each groove portion 210 has a greater thickness than the groove portion 210 , Since it is the same as that of the third embodiment EM3 shown in FIG. 9 , a redundant description will be omitted below.

As shown in FIG. 10 , according to the fourth embodiment EM4 of the present invention, the elastic member 230 ′ disposed in each groove 210 ( 210 ′ in FIG. 8 ) has a thickness greater than that of the groove 210 . is done That is, the elastic member 230 ′ protrudes out of the groove portion 210 toward the middle frame 12 .

In this way, a gap between the reinforcing substrate 200 and the middle frame 12 may be maintained due to the elastic member 230 ′. Accordingly, the degree to which the stress of the middle frame 12 to which the bending stress is applied is transferred to the reinforcing substrate 200 may be reduced.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is known in the art to which the present invention pertains that various substitutions, modifications and changes are possible within the scope without departing from the technical spirit of the present invention. It will be clear to those who have the knowledge of

EA: Electronic device 10: Display device
20: storage case 30: support bar
RD: Rolling direction UD: Unrolling direction
AA: display area 21: rotation bar
10a: display module 10b: housing
100: display panel 200: reinforcing substrate
300: adhesive film
11: Transparent cover 12: Middle frame
13: back cover 14: adhesive pattern
15: circuit parts
200': porous metal material 202: voids
210, 210': groove portion 230, 230': elastic member
FDI: fixed interval VDI: variable interval

Claims (11)

a display panel including a display area through which light for image display is output; and
A first first comprising a plurality of grooves disposed under the display panel and including a flat upper surface facing the display panel and a lower surface opposite to the upper surface, the plurality of grooves having a predetermined depth from the surface of the lower surface, wherein the grooves are not disposed a reinforcing substrate having a first thickness in the region and a second thickness thinner than the first thickness in the second region in which the groove portion is disposed;
The reinforcing substrate is made of a flat metal material and a porous metal material including a plurality of pores distributed in the metal material,
The display module is repeatedly deformed alternately in a rolling form in which the display area is rotated and rolled from one side corresponding to a predetermined rolling direction in the rolling direction and an unrolled form in which the display area rotates in an unrolling direction opposite to the rolling direction and unfolds flat. .
The method of claim 1,
The porous metal material is made of copper,
The porosity of the porous metal material is 50% to 76% of the display module.
3. The method of claim 2,
The reinforcing substrate is a display module in the form of a flat plate having the same width as the display panel.
4. The method of claim 3,
The thickness of the reinforcing substrate is in the range of 70㎛ ~ 200㎛ display module.
The method of claim 1,
The plurality of groove portions are disposed in parallel with each other in the rolling direction.
6. The method of claim 5,
A display module in which the plurality of grooves are spaced apart from each other at predetermined fixed intervals.
6. The method of claim 5,
The plurality of grooves are spaced apart from each other at variable intervals that gradually decrease along the rolling direction.
The method of claim 1,
The display module further comprising an elastic member filling each of the plurality of grooves.
The method of claim 1,
a middle frame disposed under the reinforcing substrate; and
The display module further comprising: an elastic member further comprising a protrusion protruding in the direction of the middle frame from the surface of the lower surface of the reinforcing substrate while filling each of the plurality of grooves.
The display module according to any one of claims 1 to 9;
a transparent cover disposed on the display panel among the display modules and transmitting light from the display panel;
a middle frame disposed under the reinforcing substrate among the display modules; and
and a back cover disposed under the middle frame and coupled to the transparent cover.
The display device according to claim 10;
The display device may further include a first fixed region extending to one side of the display region corresponding to the rolling direction, and a rotating bar coupled to the first fixed region;
The display device may further include a second fixed area extending to the other side of the display area corresponding to the unrolling direction, and a support bar coupled to the second fixed area; and
Including a storage case for accommodating the rotating bar,
A portion of the display device is accommodated in the storage case in a rolling form around the rotating bar,
The display device is deformed in an unrolled form, and is drawn out of the storage case through an opening through the storage case.

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