JP2019109303A - Display device - Google Patents

Abstract

To allow for improvement of reliability.SOLUTION: A display device comprises: a support substrate having a first support substrate and a second support substrate separated from the first support substrate; an insulating substrate which is provided on the support substrate and has a first region corresponding to the first support substrate, a second region corresponding to the second support substrate, and a third region located between the first region and the second region; and signal wiring which is provided on the insulating substrate and extends from the first region to the second region. The signal wiring is covered with a protective member in at least the third region, and the protective member has a first convex portion formed at a first distance from a boundary between the first region and the third region and a second convex portion formed at a second distance from a boundary between the second region and the third region.SELECTED DRAWING: Figure 1

Description

  Embodiments of the present invention relate to a display device.

  In recent years, a flexible display device using a resin substrate has been developed. In the flexible display device, it is required to reduce the area of the frame portion outside the display area. For example, it is conceivable to reduce the area of the frame portion by bending the end portion on the terminal portion side by about 180 degrees so that the terminal portion is located on the back surface of the display panel. Wiring and a protection member facing the wiring are provided in a region where the display panel is bent. When the display panel is folded, the protective member provided in the folded area may crack.

Patent No. 5746313 Patent No. 4692816 JP 2001-223445 A Unexamined-Japanese-Patent No. 2003-243779

  An object of the present embodiment is to provide a display device capable of improving the reliability.

  According to one embodiment, a support substrate having a first support substrate and a second support substrate spaced from the first support substrate, and a first substrate provided on the support substrate and corresponding to the first support substrate. An insulating substrate having a region, a second region corresponding to the second support substrate, and a third region located between the first region and the second region, provided on the insulating substrate, And a signal line extending from the first area to the second area, wherein the signal line is covered by a protection member at least in the third area. A first convex portion formed at a first distance from the boundary between the first region and the third region, and a second formed at a second distance from the boundary between the second region and the third region A display device having a convex portion is provided.

  According to one embodiment, the display panel includes a first area having a display area, a second area having a terminal portion, and a third area located between the first area and the second area. The display panel has a wire and a protective member facing the wire in the third region, and a surface of the protective member is formed in a wave shape having periodical convexes and concaves. A display device is provided.

FIG. 1 is a perspective view showing the configuration of the display device according to the first embodiment. FIG. 2 is a cross-sectional view showing a display area of the display device shown in FIG. FIG. 3 is a cross-sectional view including a non-display area of the display device shown in FIG. FIG. 4 is a plan view showing the display panel according to the first embodiment. FIG. 5 is a cross-sectional view showing an example of a state in which the third region of the display panel according to the first embodiment is not bent. FIG. 6 is a cross-sectional view showing an example in which the third region of the display panel shown in FIG. 5 is bent. FIG. 7 is a cross-sectional view showing a state in which the third region of the display panel shown in FIG. 5 is reversed in the third direction Z. FIG. 8 is a cross-sectional view showing a state in which the third region of the display panel shown in FIG. 7 is bent. FIG. 9 is a cross-sectional view showing an example of a state in which the third region of the display panel according to the modification 1 is not bent. FIG. 10 is a cross-sectional view showing an example in which the third region of the display panel shown in FIG. 9 is bent. FIG. 11 is a cross-sectional view showing an example of a state in which the third region of the display panel according to the modification 2 is not bent. FIG. 12 is a cross-sectional view showing an example of a state in which the third region of the display panel according to the modification 3 is not bent. FIG. 13 is a cross-sectional view showing an example of a state in which the third region of the display panel according to the modification 4 is not bent.

  Hereinafter, embodiments will be described with reference to the drawings. The disclosure is merely an example, and it is naturally included within the scope of the present invention as to what can be easily conceived of by those skilled in the art as to appropriate changes while maintaining the gist of the invention. In addition, the drawings may be schematically represented as to the width, thickness, shape, etc. of each portion as compared with the actual embodiment in order to clarify the description, but this is merely an example, and the present invention It does not limit the interpretation. In the specification and the drawings, components having the same or similar functions as those described above with reference to the drawings already described may be denoted by the same reference symbols, and overlapping detailed descriptions may be omitted as appropriate. .

First, the display device according to the embodiment will be described in detail. Hereinafter, in the embodiment, a case where the display device DSP is an organic electroluminescence (EL) display device will be described.
FIG. 1 is a perspective view showing the configuration of the display device DSP according to the first embodiment. FIG. 1 shows a three-dimensional space defined by a first direction X, a second direction Y perpendicular to the first direction X, and a third direction Z perpendicular to the first direction X and the second direction Y. There is. In the illustrated example, the first direction X, the second direction Y, and the third direction Z are orthogonal to each other, but may intersect at an angle other than 90 degrees. Further, viewing an XY plane defined by the first direction X and the second direction Y from the third direction Z is referred to as a plan view.

  In the present embodiment, the direction toward the tip of the arrow in the third direction Z is defined as upper, and the direction opposite to the direction toward the tip of the arrow in the third direction Z is defined as downward. Further, in the case of “the second member on the first member” and “the second member below the first member”, the second member may be in contact with the first member or separated from the first member It may be In the latter case, a third member may be interposed between the first member and the second member.

As shown in FIG. 1, the display device DSP includes a display panel PNL, a wiring board FPC1, a wiring board FPC2, and the like.
The display panel PNL includes the insulating substrate 10, the film FL, the support substrate SP, the protective member PT, and the like. The display panel PNL also includes a display area DA for displaying an image and a non-display area NDA surrounding the display area DA. The display panel PNL includes a plurality of pixels PX in the display area DA. The plurality of pixels PX are arranged in the first direction X and the second direction Y, and are provided in a matrix.

  The film FL is disposed on the insulating substrate 10. In the illustrated example, the length of the end parallel to the first direction X of the film FL is substantially equal to the length of the end parallel to the first direction X of the insulating substrate 10. Further, the length of the end parallel to the second direction Y of the film FL is smaller than the length of the end parallel to the second direction Y of the insulating substrate 10. That is, the three ends of the film FL are aligned with the three ends of the insulating substrate 10 in the third direction Z. In an XY plane defined by the first direction X and the second direction Y, the area of the film FL is smaller than the area of the insulating substrate 10. Although described later, a plurality of layers are disposed between the insulating substrate 10 and the film FL.

  The support substrate SP is attached below the insulating substrate 10. The support substrate SP has a first support substrate SP1 and a second support substrate SP2, and has a groove GR between the first support substrate SP1 and the second support substrate SP2. The first support substrate SP1 overlaps the display area DA in the third direction Z. The groove portion GR and the second support substrate SP2 overlap the non-display area NDA of the insulating substrate 10 in the third direction Z.

  The display panel PNL has a mounting portion MT that extends outside the area where the film FL is disposed. The protective member PT is disposed in the mounting unit MT. The protective member PT is in contact with the film FL and the wiring board FPC1. The upper surface (hereinafter referred to as a surface) PF1 of the protection member PT is formed in a wave shape having, for example, a plurality of convex portions CP and a plurality of concave portions RE which are periodic in the second direction Y. The surface PF1 may simply be formed in a wave shape. The convex portion CP and the concave portion RE respectively extend in the first direction X on the surface PF1 of the protective member PT.

  In the illustrated example, the wiring substrate FPC1 is mounted on the mounting portion MT in the non-display area NDA. The length of the end parallel to the first direction X of the wiring board FPC1 is smaller than the length of the end parallel to the first direction X of the insulating substrate 10, but may be equal. The display panel PNL and the wiring substrate FPC1 are electrically connected to each other. The wiring substrate FPC2 is disposed below the wiring substrate FPC1 and is electrically connected to the wiring substrate FPC1. The wiring board FPC2 is overlapped on the opposite side to the side on which the display panel PNL of the wiring board FPC1 is overlapped. The wiring board FPC2 may be disposed on the wiring board FPC1.

FIG. 2 is a cross-sectional view showing a display area DA of the display device DSP shown in FIG.
As shown in FIG. 2, the display panel PNL includes an insulating substrate 10, switching elements SW1, SW2, SW3, a reflective layer 4, organic EL elements OLED1, OLED2, OLED3, sealing layer 41, support substrate SP, adhesive layer GL, And a film FL and the like.

  The insulating substrate 10 is provided on the support substrate SP via the adhesive layer AD. The insulating substrate 10 is formed using an organic insulating material, and is formed using, for example, polyimide. The insulating substrate 10 is covered by a first insulating film 11. The insulating substrate 10 may be formed only of a single layer formed of an organic insulating material such as polyimide, or formed of a layer formed of an organic insulating material and an inorganic insulating material. The layers may be alternately stacked.

  The switching elements SW1, SW2, and SW3 are formed on the first insulating film 11. In the illustrated example, the switching elements SW1, SW2, and SW3 are formed of top gate thin film transistors, but may be formed of bottom gate thin film transistors. Since the switching elements SW1, SW2, and SW3 have the same configuration, the structure will be described in more detail focusing on the switching element SW1. The switching element SW1 includes a semiconductor layer SC formed on the first insulating film 11. The semiconductor layer SC is covered by the second insulating film 12. The second insulating film 12 is also disposed on the first insulating film 11.

The gate electrode WG of the switching element SW1 is formed on the second insulating film 12, and is located directly on the semiconductor layer SC. The gate electrode WG is covered by the third insulating film 13. The third insulating film 13 is also disposed on the second insulating film 12.
The first insulating film 11, the second insulating film 12, and the third insulating film 13 are made of, for example, an inorganic material such as silicon oxide or silicon nitride.

The source electrode WS and the drain electrode WD of the switching element SW1 are formed on the third insulating film 13. The source electrode WS and the drain electrode WD are electrically connected to the semiconductor layer SC through contact holes penetrating the second insulating film 12 and the third insulating film 13, respectively. The switching element SW1 is covered by the fourth insulating film 14. The fourth insulating film 14 is also disposed on the third insulating film 13. Such a fourth insulating film 14 is formed of, for example, an organic material such as a transparent resin.
The reflective layer 4 is formed on the fourth insulating film 14. The reflective layer 4 is formed of a metal material having a high light reflectance, such as aluminum or silver. The upper surface of the reflective layer 4 may be a flat surface or may be an uneven surface for imparting light scattering properties.

  The organic EL elements OLED1 to OLED3 are formed on the fourth insulating film 14. That is, the organic EL elements OLED1 to OLED3 are located between the insulating substrate 10 and the film FL. In the illustrated example, the organic EL element OLED1 is electrically connected to the switching element SW1, the organic EL element OLED2 is electrically connected to the switching element SW2, and the organic EL element OLED3 is electrically connected to the switching element SW3. There is. The organic EL elements OLED1 to OLED3 are configured as top emission types that emit red light, blue light, and green light toward the side of the film FL, respectively. All such organic EL elements OLED1 to OLED3 have the same structure. In the illustrated example, the organic EL elements OLED1 to OLED3 are partitioned by the ribs 15, respectively.

  The organic EL element OLED1 includes a pixel electrode PE1 formed on the reflective layer 4. The pixel electrode PE1 is in contact with the drain electrode WD of the switching element SW1 and is electrically connected to the switching element SW1. Similarly, the organic EL element OLED2 includes a pixel electrode PE2 electrically connected to the switching element SW2, and the organic EL element OLED3 includes a pixel electrode PE3 electrically connected to the switching element SW3. The pixel electrodes PE1, PE2 and PE3 are formed of, for example, a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

  For example, the organic EL element OLED1 comprises an organic light emitting layer ORGB emitting blue light, the organic EL element OLED2 comprises an organic light emitting layer ORGG emitting green, and the organic EL element OLED3 comprises an organic light emitting layer ORGR emitting red There is. The organic light emitting layer ORGB is located on the pixel electrode PE1, the organic light emitting layer ORGG is located on the pixel electrode PE2, and the organic light emitting layer ORGR is located on the pixel electrode PE3. In addition, the organic EL elements OLED1 to OLED3 are provided with the common electrode CE. The common electrode CE is located on the organic light emitting layers ORGB, ORGG, ORGR. The common electrode CE is also located on the rib 15. One of the pixel electrode PE and the common electrode CE is an anode, and the other is a cathode. The common electrode CE is formed of, for example, a transparent conductive material such as ITO or IZO.

  The sealing layer 41 covers the top of the organic EL elements OLED1, OLED2, and OLED3. The sealing layer 41 seals a member disposed between the insulating substrate 10 and the sealing layer 41. The sealing layer 41 suppresses the entry of oxygen and moisture into the organic EL elements OLED1, OLED2, and OLED3, and suppresses the deterioration of the organic EL elements OLED1, OLED2, and OLED3. The sealing layer 41 may be formed of a laminate of an inorganic film and an organic film.

  The film FL is disposed on the sealing layer 41. The film FL is, for example, a protective film, an optical film, or the like, and is formed using a transparent material. The film FL is adhered to the sealing layer 41 by the adhesive layer GL. The adhesive layer GL is formed using, for example, any of an acrylic material, an epoxy material, and a polyimide.

  The supporting substrate SP is bonded to the insulating substrate 10 on the side opposite to the film FL of the insulating substrate 10. The support substrate SP is bonded to the insulating substrate 10 by the adhesive layer AD. As a material of the support substrate SP, for example, a material which is excellent in heat resistance, gas barrier property, moisture resistance, and strength and is inexpensive is preferable. The support substrate SP has, for example, a heat resistance that does not deteriorate or deform at the process temperature in the process of manufacturing the display device DSP. In addition, the support substrate SP has, for example, a strength greater than that of the insulating substrate 10, and functions as a support layer that suppresses a situation where the display panel PNL is bent in the state where no external stress is applied. In addition, the support substrate SP has, for example, a moisture-proof property that suppresses the entry of moisture and the like into the insulating substrate 10, a gas blocking property that suppresses the entry of gas, and the like, and functions as a barrier layer. The support substrate SP is, for example, a film formed using polyethylene terephthalate.

In such a display device DSP, when each of the organic EL elements OLED1 to OLED3 emits light, the organic EL element OLED1 emits blue light, and the organic EL element OLED2 emits green light, and the organic EL element OLED3 Emits red light. Therefore, color display of the display device DSP is realized.
The pixel PX shown in FIG. 1 is, for example, the smallest unit constituting a color image, and includes the above-described organic EL elements OLED1 to OLED3.

  In the above configuration example, the organic EL elements OLED1 to OLED3 respectively include the organic light emitting layer ORGB emitting blue light, the organic light emitting layer ORGG emitting green light, and the organic light emitting layer ORGR emitting red light. It is not limited. The organic EL elements OLED1 to OLED3 may be provided with a common organic light emitting layer. At this time, for example, the organic EL elements OLED1 to OLED3 emit white light. In such a configuration example, the color filter layer is disposed on the sealing layer 41.

FIG. 3 is a cross-sectional view including the non-display area NDA of the display device DSP shown in FIG.
In the illustrated example, the first support substrate SP1 and the second support substrate SP2 are separated from each other in the second direction Y. The first insulating film 11 and the second insulating film 12 extend to a position overlapping the end 10 E of the insulating substrate 10. The third insulating film 13 does not extend to a position overlapping the groove GR.
The signal wiring 6 is provided on the support substrate SP, and is disposed on the second insulating film 12 and the third insulating film 13. The signal lines 6 are continuously arranged from the display area DA to the non-display area NDA, and extend to a position overlapping the pad PD. The signal wiring 6 is formed of, for example, a laminated body of titanium, aluminum, and titanium. The signal lines 6 correspond to power supply lines, various control lines, and the like.

The fourth insulating film 14 covers the signal wiring 6. The fourth insulating film 14 has a contact hole CH penetrating to the signal wiring 6.
The pad PD is disposed on the fourth insulating film 14 and also disposed in the contact hole CH. The pad PD is electrically connected to the signal wiring 6 in the contact hole CH. The pad PD is formed of, for example, the same material and in the same process as the pixel electrodes PE1, PE2, and PE3 illustrated in FIG. 2, and is formed using ITO, IZO, or the like.

  Note that both of the signal wiring 6 and the pad PD may be disposed in the same layer. At this time, the signal wiring 6 and the pad PD may be separately formed or may be integrally formed. Further, as shown in the figure, the signal wiring 6 and the pad PD are arranged in different layers, and both are electrically connected through the contact hole formed in the interlayer insulating film between the signal wiring 6 and the pad PD. It is good.

  The rib 15, the sealing layer 41, the adhesive layer GL, and the film FL are disposed at positions overlapping the first support substrate SP1 in the third direction Z, and do not extend to the position overlapping the groove GR. The sealing layer 41 covers the rib 15 and is also in contact with the fourth insulating film 14. The adhesive layer GL covers the sealing layer 41 and is also in contact with the fourth insulating film 14.

  The wiring substrate FPC1 is mounted on the display panel PNL on the fourth insulating film 14. The wiring substrate FPC 1 includes the core substrate 200, the connection wiring 100 disposed on the lower surface side of the core substrate 200, and the drive IC chip 3 disposed on the upper surface side of the core substrate 200. The drive IC chip 3 functions as a signal supply source or the like that supplies signals necessary to drive the display panel PNL. The position of the drive IC chip 3 is not particularly limited, and may be disposed on the lower surface side of the core substrate 200.

  The display panel PNL and the wiring substrate FPC1 are electrically connected to and bonded to each other through an anisotropic conductive film 8 which is a conductive material. That is, the anisotropic conductive film 8 contains the conductive particles dispersed in the adhesive. Therefore, with the anisotropic conductive film 8 interposed between the wiring substrate FPC1 and the display panel PNL, the wiring substrate FPC1 and the display panel PNL are pressurized from above and below in the third direction Z and heated, Both are electrically and physically connected. The anisotropic conductive film 8 is in contact with the pad PD and electrically connected. The anisotropic conductive film 8 is in contact with the connection wiring 100 and is electrically connected. Thus, the connection wiring 100 is electrically connected to the pad PD and the signal wiring 6 via the anisotropic conductive film 8.

  The protective member PT is in contact with the fourth insulating film 14 at the lower surface PF2 opposite to the surface PF1. In the example shown in FIG. 3, the protective member PT is also in contact with the wiring substrate FPC1, the film FL, the adhesive layer GL, and the like. Further, the protection member PT is in contact with the upper surface of the wiring substrate FPC1 and the upper surface of the film FL. The protective member PT reinforces the insulating substrate 10 between the wiring substrate FPC1 and the film FL. Further, the protective member PT is formed of, for example, a resin. The protective member PT may include the fourth insulating film 14.

  Here, in the present embodiment, the display panel PNL is located between the first area AR1 having the display area DA, the second area AR2 having the terminal portion T, and the first area AR1 and the second area AR2. And a third area AR3. The first area AR1 corresponds to the first support substrate SP1, and the second area AR2 corresponds to the second support substrate SP2. The third region AR3 corresponds to the groove portion, and the support substrate SP is not provided. In other words, the support substrate SP includes the first area AR1, the second area AR2, and the third area AR3. The third area AR3 corresponds to an area which is bent when being accommodated in a housing such as an electronic device. For example, the third region AR3 is bent so that the wiring substrate FPC1 and the wiring substrate FPC2 are disposed below the display panel PNL. At this time, the pad PD is also located below the display panel PNL. The third area AR3 is located in the non-display area NDA. The signal wiring 6 and the protection member PT extend from the first area AR1 to the second area AR2 in the second direction, and are disposed in the third area AR3. The protective member PT covers the signal wiring 6 from the first area AR1 to the second area AR2. The protective member PT covers the signal wiring 6 at least in the third area AR3.

FIG. 4 is a plan view showing the display panel PNL according to the first embodiment, and is a view showing the positional relationship and the like of the first support substrate SP1 and the second support substrate SP2. In FIG. 4, the first support substrate SP <b> 1 is indicated by diagonal lines rising to the left, and the second support substrate SP <b> 2 is indicated by diagonal lines rising to the right.
The display panel PNL has a first end E1 and a second end E2 extending in the first direction X, and a third end E3 and a fourth end E4 extending in the second direction. There is. The end E1 and the end E2 face each other across the display area DA. The end E3 and the end E4 face each other across the display area DA. The first end E1 is located on the terminal T side.

  The first region AR1 overlaps the first support substrate SP1 in plan view. The second region AR2 overlaps the second support substrate SP2 in plan view. The plurality of pads PD are arranged in the terminal portion T and arranged side by side in the first direction X. The third region AR3 overlaps the groove GR in a plan view, and extends from the end E3 to the end E4 of the display panel PNL along the first direction X. That is, the third area AR3 is located between the first support substrate SP1 and the second support substrate SP2 in a plan view. In other words, the third area AR3 is located between the display area DA and the terminal portion T in a plan view. The plurality of signal lines 6 are respectively connected to the pads PD, extend along the second direction Y in the third area AR3, and are aligned along the first direction X. That is, the signal wiring 6 extends from the first area AR1 toward the second area AR2. Further, as shown in FIG. 4, the third region AR3 may be formed to have a smaller width in the first direction X as compared with the region overlapping with the first support substrate SP1 so as to be easily bent. In the illustrated example, the first area AR1 is formed in a rectangular shape in a plan view, but may be formed in a round shape in which the corner portion is rounded. Although the display area DA is formed in a rectangular shape in plan view, the display area DA may be formed in a round shape with rounded corners.

  FIG. 5 is a cross-sectional view showing an example of a state in which the third area AR3 of the display panel PNL according to the first embodiment is not bent. In FIG. 5, the third area AR3 extends in the second direction Y. In FIG. 5, the third area AR3 is divided into, for example, a 3a area AR3a and a 3b area AR3b having the same width in the second direction Y. That is, the third area AR3 is divided into two equal parts, the 3a area AR3a and the 3b area AR3b. The third a region AR3a and the third b region AR3b are adjacent in the second direction Y. The third a region AR3a is adjacent to the first region AR1 and the third b region AR3b in the second direction Y. The third b area AR3 b is adjacent to the third a area AR3 a and the second area AR2 in the second direction Y. In FIG. 5, the first boundary portion BD1 between the third region AR3a and the third region AR3b, the second boundary BD2 between the first region AR1 and the third region AR3a, the second region AR2 and the third region AR3b And a third boundary portion BD3. The first boundary portion BD1 coincides with the center position of the third region AR3. The second boundary portion BD2 may, for example, coincide with the end portion SP1e of the first support substrate SP1 in the second direction Y. The third boundary portion BD3 may, for example, coincide with the end portion SP2e of the second support substrate SP2 in the second direction Y. Hereinafter, for convenience of explanation, in a state where the third area AR3 is not bent, the position of the second boundary portion BD2 is referred to as a position P1, and the position of the center of the third area AR3a in the second direction Y is referred to as a position P2. The position of the portion BD1 is a position P3, the position of the center of the third region AR3b in the second direction Y is a position P4, and the position of the third boundary portion BD3 is a position P5.

  In the example shown in FIG. 5, the protective member PT is configured such that the first convex portion CP1, the second convex portion CP2, the first concave portion RE1, the second concave portion RE2, and the third concave portion RE3 in the third region AR3. have. The cross-sectional shapes of the first convex portion CP1 and the second convex portion CP2 are each formed in a curved shape having a top. In the illustrated example, the cross-sectional shape of the first convex portion CP1 and the cross-sectional shape of the second convex portion are formed in the same shape, but may be formed in different shapes. The cross-sectional shapes of the first recess part RE1, the second recess part 2 and the third recess part RE3 are each formed in a curved shape having a bottom. In the illustrated example, the cross-sectional shapes of the first recess part RE1, the second recess part RE2, and the third recess part RE3 are formed in the same shape, but may be formed in different shapes. For example, in the example shown in FIG. 5, the average value of the thickness of the protection member PT is greater than the thickness of the protection member PT when the surface PF1 of the protection member PT is formed flat in the third region AR3. large. In one example, the average value of the thickness of the protective member PT is 100 μm to several hundred μm. Hereinafter, the thickness corresponds to the length along the third direction Z in the state in which the third area AR3 is not bent as shown in FIG. The thickness of the convex portion corresponds to the thickness from the lower surface PF2 to the top, and the thickness of the recess corresponds to the thickness from the lower surface PF2 to the bottom.

  The first convex portion CP1 is located in the third a region AR3a. The second convex portion CP2 is located in the third b area AR3 b. As an example, the first convex portion CP1 is located at the position P2. The second convex portion CP2 is located at the position P4. In the illustrated example, the top VT1 of the first convex portion CP1 is located at the position P2. Top part VT2 of 2nd convex part CP2 is located in position P4. In other words, the top VT1 is located at the same distance Y1 from the first boundary BD1 and the second boundary BD2 in the 3a region AR3a. Similarly, the top VT2 is located at the same distance Y2 from the first boundary BD1 and the third boundary BD3 in the 3b-region AR3b. Here, for example, the distance Y1 and the distance Y2 are the same. Note that “the first convex portion CP1 is located at the position P2” means that the top VT1 may not be coincident with the position P2, and a portion of the convex portion CP1 may be located at the position P2 . In one example, a portion corresponding to a thickness of up to 80% of the first convex portion CP1 may be located at the position P2. Further, the first convex portion CP1 may be offset from the position P2. The same applies to the other convex portions as in the first convex portion CP1.

  The first concave portion RE1 is located between the first convex portion CP1 and the second convex portion CP2 in the second direction Y. The second concave portion RE2 is located on the first region AR1 side with respect to the first convex portion CP1 in the second direction Y. The third concave part RE3 is located on the second region AR2 side with respect to the second convex part CP2 in the second direction Y. As an example, the first recess part RE1 is located at the position P3. The second recess part RE2 is located at the position P1. The third recess part RE3 is located at the position P5. In the illustrated example, the bottom BT1 of the first recess part RE1 is located at the position P3. Bottom part BT2 of 2nd recessed part RE2 is located in the position P1. Bottom part BT3 of 3rd recessed part RE3 is located in position P5. Note that “the first concave portion RE1 is located at the position P3” does not have to match the bottom portion BT1 with the position P3, and a portion of the concave portion RE1 may be positioned at the position P3. In one example, a portion corresponding to a thickness of up to 120% of the first recess part RE1 may be located at the position P3. Further, the first recess part RE1 may be offset from the position P3. The same applies to the other recesses as in the first recess RE1.

  The thickness TR1 of the first recess RE1, the thickness TR2 of the second recess RE2, and the thickness TR3 of the third recess RE3 are greater than the thickness TC1 of the first protrusion CP1 and the thickness TC2 of the second protrusion CP2. small. For example, thickness TC1 and thickness TC2 are the same. Also, for example, the thicknesses TR1, TR2, and TR3 are the same. In this case, the thicknesses TR1 to TR3 are respectively half or more of the thicknesses TC1 and TC2. When the thicknesses TC1 and TC2 are different, the thicknesses TR1 to TR3 are respectively half or more of the larger one of the thicknesses TC1 and TC2.

  FIG. 6 is a cross-sectional view showing an example of a state in which the third area AR3 of the display panel PNL shown in FIG. 5 is bent. In FIG. 6, only the main configuration of the display device DSP according to the first embodiment is shown, and the illustration of the other members is omitted. FIG. 6 shows the display panel PNL in which the third area AR3 is bent in the bending direction CD. In the folding direction CD, the arrow is positive and the opposite is negative. In FIG. 6, the bending direction CD is from the third direction Z to the second direction Y. In FIG. 6, the third area AR3 is bent in a semicircular shape along the bending direction CD in the Z-Y plane, with the second boundary portion BD2 as a bending start point (0 °). The first boundary portion BD1 is located at a position rotated 90 ° in the bending direction CD from the second boundary portion BD2. That is, the first boundary portion BD2 is located at 90 ° of the semicircular shape of the third region AR3. The third boundary portion BD3 is located at a position rotated 90 ° in the bending direction CD from the first boundary portion BD1. That is, the third boundary portion BD3 is located at 180 ° (end point) of the semicircular shape of the third region AR3. FIG. 6 shows the center O of the semicircular shape of the third area AR3. Hereinafter, in the third region AR3, the direction of the center O is referred to as the inner periphery, and the direction opposite to the inner periphery is referred to as the outer periphery. Hereinafter, for convenience of description, in a state where the third region AR3 is bent in a semicircular shape, the position of the semicircular 0 ° (second boundary portion BD2) is set as a position RP1 and the 45 ° position of the semicircular The position of the semicircular 90 ° (first boundary portion BD1) is RP2 and the position of the semicircular 135 ° position is position RP4. The semicircular 180 ° (third boundary portion BD3) Let the position be position RP5. In FIG. 6, the third a region AR3 a is a region from the position RP1 to the position RP3 in the bending direction CD. In FIG. 6, the third b area AR3b is an area from the position RP3 to the position RP5 in the bending direction CD. In the bent third area AR3, the 3a area AR3a and the 3b area AR3b are aligned in the bending direction CD. Although the third area AR3 is bent in a semicircular shape, it may not be semicircular.

  The display device DSP further includes a cover member CM, a polarizing plate PL, a holding member 50, adhesive layers 51, 52, 53, and the like. The display panel PNL is bent in the third area AR3 such that the first area AR1 and the second area AR2 face each other on the side opposite to the cover member CM. The third area AR3 is bent so that the terminal portion T is located below the display panel PNL. That is, the terminal portion T is located on the opposite side to the cover member CM side with respect to the display area DA. The end E1 is located on the opposite side of the display area DA to the cover member CM.

  The polarizing plate PL is disposed on the film FL. The cover member CM is disposed on the display panel PNL. The cover member CM faces the display area DA and extends to a position facing the third area AR3. For example, although the cover member CM is formed using glass, it may be formed using a material other than glass. The cover member CM is bonded to the first area AR1 via the adhesive layer 53.

  The holding member 50 is disposed between the first support substrate SP1 and the second support substrate SP2. The adhesive layer 51 is disposed between the first support substrate SP1 and the holding member 50, and bonds the both. The adhesive layer 52 is disposed between the second support substrate SP2 and the holding member 50, and bonds the two. The adhesive layers 51 and 52 are, for example, double-sided tapes.

  In the example shown in FIG. 6, the signal wiring 6 is located between the insulating substrate 10 and the protective member PT in the third area AR3. The insulating substrate 10 is located on the inner periphery of the signal wiring 6 in the third region AR3. The protective member PT is located on the outer periphery than the signal wiring 6 in the third area AR3. The surface PF1 of the protective member PT is located at the outermost periphery in the third region AR3.

  The first convex portion CP1 protrudes to the outer periphery and is located at a position RP2. The second convex portion CP2 protrudes to the outer periphery and is located at a position RP4. In other words, the first convex portion CP1 is located at the central portion of the width of the third a region AR3a in the bending direction CD. The second convex portion CP2 is located at the center of the width of the third b area AR3b in the bending direction CD. In the illustrated example, the top VT1 of the first protrusion CP1 is located at the position RP2. Top part VT2 of 2nd convex part CP2 is located in position RP4. The first convex portion CP1 may be shifted from the position RP2 in a range of ± 10 ° in the bending direction CD. The second convex portion CP2 may be deviated from the position RP4 within a range of ± 10 ° in the bending direction CD.

  The first recess part RE1 is located at the position RP3. The second recess part RE2 is located at the position RP1. The third recess part RE3 is located at the position RP5. In the illustrated example, the bottom BT1 of the first recess part RE1 is located at the position RP3. The bottom part BT2 of the second recess part RE2 is located at the position RP1. Bottom part BT3 of 3rd recessed part RE3 is located in position RP5. The first recess part RE1 may be shifted from the position RP3 in the range of ± 10 ° in the bending direction CD. The second recess part RE2 may be shifted in the range of 10 ° from the position RP1. The third recess part RE3 may be shifted in the range from the position RP5 to -10 °.

Next, an example of a method of bending the third area AR3 of the display panel PNL described above will be described with reference to FIGS. 7 and 8. FIG.
FIG. 7 is a cross-sectional view showing a state in which the third area AR3 of the display panel PNL shown in FIG. 5 is reversed in the third direction Z. In FIG. 7, only the configuration necessary for the description is shown, and the illustration of the other members is omitted. In FIG. 7, the bending direction CD is from the second direction Y to the third direction Z.

  In the example shown in FIG. 7, the first end E1 of the display panel PNL is lifted with the position P1 (second boundary portion BD2) as a bending start point, and the third region AR3 is bent in the bending direction CD. As shown in FIG. 7, the third area AR3 is gradually bent so as to face the first area AR1 from the state in which the second area AR2 extends in the second direction Y along the bending direction CD. Therefore, the radius of the third area AR3 gradually decreases.

FIG. 8 is a cross-sectional view showing a state in which the third area AR3 of the display panel PNL shown in FIG. 7 is bent. In FIG. 8, only the main configuration of the first embodiment is shown, and the illustration of the other members is omitted.
The bending stress is added to the third region AR3 as it is bent and the curvature increases. For example, when the third region AR3 is bent, a tensile stress is applied to the protection member PT located on the outer peripheral side, and a compressive stress is applied to the insulating substrate 10 located on the inner peripheral side. When the tensile stress and the compressive stress are applied to the signal wiring 6, the signal wiring 6 may be disconnected. Therefore, in the present embodiment, the signal wiring 6 is disposed at or near the neutral plane where the tensile stress and the compressive stress of the signal wiring 6 located in the third area AR3 are both substantially zero. By arranging the signal wiring 6 in the neutral plane or in the vicinity thereof as described above, disconnection of the signal wiring 6 can be suppressed.
Further, the signal wiring 6 is more resistant to compressive stress than to tensile stress. Therefore, even if the signal wiring 6 is disposed on the inner peripheral side of the neutral plane, disconnection of the signal wiring 6 can be suppressed.

On the other hand, when the protective member PT is formed thick as a whole in order to dispose the signal wiring 6 on the inner peripheral side of the neutral plane, a large bending stress is applied to the protective member PT to cause distortion. When the protective member PT is distorted, the protective member PT may be cracked. When a crack occurs in the protective member PT, the crack propagates and the signal wire 6 is broken even if the signal wire 6 is disposed on the neutral plane, in the vicinity of the neutral plane or on the inner peripheral side of the neutral plane. There is a fear. Therefore, in the present embodiment, by forming the protection member PT partially thick, the signal wiring 6 is disposed on the inner peripheral side of the neutral plane while suppressing the bending stress applied to the protection member PT. .
In the example shown in FIG. 8, when the protection member PT is formed so that the surface PF1 of the protection member PT is flat and the third area AR3 is bent, a position RP2 (45 °) and a position to which bending stress is easily applied The thickness of the protective member PT located at RP4 (135 °) is formed larger in the third region AR3 than the thickness of the protective members PT at other positions (angles).

  Thus, by forming the thickness of the protective member PT at a position where bending stress is easily applied and the thickness of the protective member at another position, the signal wiring 6 is likely to be subjected to bending stress at other positions. It will be located on the inner circumference side relatively in position. Therefore, disconnection of the signal wiring 6 is suppressed by changing the thickness of the protective member PT depending on the position as described above. In addition, bending stress applied to the entire protective member PT can be reduced, and distortion can be less likely to occur. In other words, by changing the thickness of the protective member PT depending on the position, the tensile stress applied to the protective member PT differs depending on the position. Therefore, the bending stress applied to the whole protection member PT can be made small, and generation | occurrence | production of the crack of protection member PT is suppressed.

  According to the present embodiment, the display device 1 includes the display panel PNL having the third area AR3 bent so that the first area AR1 and the second area AR2 face each other. In the third region AR3, the display panel PNL includes the insulating substrate 10 located on the inner periphery, the protective member PT located on the outer periphery, and the signal wiring 6 located between the insulating substrate 10 and the protective member PT. . When the third area AR3 is bent, a tensile stress is applied to the protection member PT located outside the neutral plane. The protective member PT is provided with a convex portion CP at a portion to which a tensile stress is easily applied when the third region AR3 is bent. For example, when the third region AR3 is bent, the protection member PT includes a first convex portion CP1 located at the position RP2 and a second convex portion CP2 located at the position RP4. As described above, the protective member PT can reduce the tensile stress because the surface PF1 is formed in a periodic wave shape. In addition, since the surface PF1 of the protection member PT is periodically wave-shaped, the display panel PNL is easily bent. Therefore, a display device capable of improving reliability can be provided.

Next, a display device according to a modification will be described. In the modification explained below, the same reference numerals are given to the same parts as the first embodiment described above, and the detailed description thereof is omitted or simplified, and the parts different from the first embodiment are mainly described in detail. explain.
FIG. 9 is a cross-sectional view showing an example of a state in which the third area AR3 of the display panel PNL according to the modification 1 is not bent. Hereinafter, in a state where the third region AR3 is not bent, the position of the center of the second direction Y between the position P1 and the position P2 is set as a position P12, and the center of the second direction Y between the position P2 and the position P3. Position P23 is the position of the center of the second direction Y between the position P3 and the position P4 is the position P34, and the position of the center of the second direction Y between the position P4 and the position P5 is the position RP45 Do.

  In the example shown in FIG. 9, the protective member PT is configured such that the first convex portion CP1, the second convex portion CP2, the third convex portion CP3, the fourth convex portion CP4, and the fifth convex portion in the third region AR3. A portion CP5, a fourth concave portion RE4, a fifth concave portion RE5, a sixth concave portion RE6, and a seventh concave portion RE7 are provided. The cross-sectional shapes of the third convex portion CP3, the fourth convex portion CP4, and the fifth convex portion CP3 are each formed in a curved shape having a top. In the illustrated example, the cross sectional shapes of the first convex portion CP1, the second convex portion CP2, the third convex portion CP3, the fourth convex portion CP4, and the fifth convex portion CP5 are formed in the same shape, but are different. It may be formed in a shape. The cross-sectional shapes of the fourth recess part RE4, the fifth recess part RE5, the sixth recess part RE6, and the seventh recess part RE7 are each formed in a curved shape having a bottom. In the illustrated example, the cross-sectional shapes of the fourth recess portion RE4, the fifth recess portion RE5, the sixth recess portion RE6, and the seventh recess portion RE7 are formed in the same shape, but may be formed in different shapes.

  The third convex portion CP3 is located between the first convex portion CP1 and the second convex portion CP2 in the second direction Y. The fourth convex portion CP4 is located on the first region AR1 side with respect to the first convex portion CP1 in the second direction Y. The fifth convex portion CP5 is located on the second region AR2 side with respect to the second convex portion CP2 in the second direction Y. As an example, the third convex portion CP3 is located at the position P3. The fourth convex portion CP4 is located at the position P1. The fifth convex portion CP5 is located at the position P5. In the illustrated example, the top VT3 of the third convex portion CP3 is located at the position P3. The top VT4 of the fourth convex portion CP4 is located at the position P1. The top VT5 of the fifth convex portion CP5 is located at the position P5. In other words, in the second direction Y, the top VT3 is spaced from the first protrusion CP1 by the distance Y1 toward the second area AR2, and from the second protrusion CP2 by the distance Y2 toward the first area AR1. It is located where you put it. The top VT4 is located at a distance Y1 from the first protrusion CP1 to the first area AR1 in the second direction Y. The top VT5 is located at a distance Y2 from the second protrusion CP2 toward the second area AR2 in the second direction Y. In the illustrated example, the first to fifth convex portions CP1 to CP5 are arranged at equal intervals in the second direction Y.

  The fourth concave part RE4 is located between the first convex part CP1 and the third convex part CP3 in the second direction Y. The fifth concave part RE5 is located between the second convex part CP2 and the third convex part CP3 in the second direction Y. The sixth concave portion RE6 is located between the first convex portion CP1 and the fourth convex portion CP4 in the second direction Y. The seventh concave portion RE7 is located between the second convex portion CP2 and the fifth convex portion CP5 in the second direction Y. As an example, 4th recessed part RE4 is located in the position P23. The fifth recess part RE5 is located at the position P34. The sixth recess part RE6 is located at the position P12. The seventh recess part RE7 is located at the position P45. In the illustrated example, the bottom BT4 of the fourth recess part RE4 is located at the position P23. The bottom part BT5 of the fifth recess part RE5 is located at the position P34. The bottom part BT6 of the sixth recess part RE6 is located at the position P12. The bottom part BT7 of the seventh recess part RE7 is located at the position P34.

  The thickness TR4 of the fourth recess RE4, the thickness TR5 of the fifth recess RE5, the thickness TR6 of the sixth recess RE6, and the thickness TR7 of the seventh recess RE7 are the thickness TC1 of the first protrusion CP1, the second The thickness TC2 of the convex portion CP2, the thickness TC3 of the third convex portion CP3, the thickness TC4 of the fourth convex portion CP4, and the thickness TC5 of the fifth convex portion CP5 are smaller. For example, the thicknesses TC1 to TC5 are the same. Also, for example, the thicknesses TR4 to TR7 are the same. In this case, the thicknesses TR4 to TR7 are respectively half or more of the thicknesses TC1 to TC5. When the thicknesses TC1 to TC5 are different from each other, the thicknesses TR4 to TR7 are respectively equal to or larger than half of the largest thickness among the thicknesses TC1 to TC5.

  FIG. 10 is a cross-sectional view showing an example in which the third area AR3 of the display panel PNL shown in FIG. 9 is bent. In FIG. 10, only the main configuration of the display device DSP according to the first modification is shown, and illustration of the other members is omitted. Hereinafter, in a state in which the third region AR3 is bent into a semicircular shape, a semicircular 22.5 ° position is referred to as a position RP12, and a semicircular 67.5 ° position is referred to as a position RP23. A position of 112.5 ° is taken as a position RP34, and a semicircular 157.5 ° position is taken as a position RP45.

  In the example shown in FIG. 10, the third convex portion CP3 is located at a position RP3 (90 °) where bending stress is likely to be applied next to the positions RP2 and RP4. The fourth convex portion CP4 is located at a position RP1 (0 °) where bending stress is likely to be applied next to the position RP3. Similar to the position RP1, the fifth convex portion CP5 is located at a position RP5 (180 °) where bending stress is likely to be applied next to the position RP3. In other words, the third convex portion CP3 is located at the first boundary portion BD1. The fourth convex portion CP4 is located at the second boundary portion BD2. The fifth convex portion CP5 is located at the third boundary portion BD3. In the illustrated example, the top VT3 of the third convex portion CP3 is located at the position RP3. Top part VT4 of 4th convex part CP4 is located in position RP1. Top part VT5 of the 5th convex part CP5 is located in position RP5. The third convex portion CP3 may be deviated from the position RP3 in a range of ± 10 ° in the bending direction. The fourth convex portion CP4 may be shifted from the position RP1 in a range from + 10 ° in the bending direction. The fifth convex portion CP5 may be shifted from the position RP5 in a range of -10 ° in the bending direction. Moreover, when bending 3rd area | region AR3, the position and order which bending stress tends to add may differ from what was mentioned above.

The fourth recess part RE4 is located at the position RP23. The fifth recess part RE5 is located at the position RP34. The sixth recess part RE6 is located at the position RP12. The seventh recess part RE7 is located at the position RP45. In the illustrated example, the bottom BT4 of the fourth recess part RE4 is located at the position RP23. The bottom part BT5 of the fifth recess part RE5 is located at the position RP34. The bottom BT6 of the sixth recess part RE6 is located at the position RP12. The bottom part BT7 of the seventh recess part RE7 is located at the position RP45. The fourth concave part RE4 may be displaced from the position RP23 in the range of ± 10 ° in the bending direction CD. The fifth recess part RE5 may be deviated from the position RP34 in the range of ± 10 ° in the bending direction CD. The sixth recess part RE6 may be deviated from the position RP12 in the range of ± 10 ° in the bending direction CD. The seventh recess part RE7 may be deviated from the position RP45 in the range of ± 10 ° in the bending direction CD.
According to the first modification, the same effect as that of the above-described embodiment can be obtained. In addition, the resistance to bending stress of the protective member PT may be improved more than the above-described embodiment.

  FIG. 11 is a cross-sectional view showing an example of a state in which the third area AR3 of the display panel PNL according to the modification 2 is not bent. In the third region AR3 of the display panel PNL according to the modification example 2, the thickness of the first convex portion CP1 and the second convex portion CP2 to which the tensile stress is most likely to be applied is the third convex portion CP3 and the fourth convex portion CP4. , And the thickness of the fifth convex portion CP5.

In the example shown in FIG. 11, on the surface PF1 of the protective member PT, the thicknesses of the adjacent convex portions CP in the second direction Y are different. The thickness TC31 of the third convex portion CP3, the thickness TC41 of the fourth convex portion CP4, and the thickness TC51 of the fifth convex portion CP5 are derived from the thickness TC1 of the first convex portion and the thickness TC2 of the second convex portion. Too small. For example, the thicknesses TC31, TC41, and TC51 are the same.
According to the second modification, the same effect as that of the above-described embodiment can be obtained.

FIG. 12 is a cross-sectional view showing an example of a state in which the third area AR3 of the display panel PNL according to the modification 3 is not bent. In the third region AR3 of the display panel PNL according to the modification 2, the thickness of the protective member PT is formed in the order of increasing the tensile stress.
In the example shown in FIG. 12, the heights of the adjacent convex portions CP in the second direction Y are different on the surface PF1 of the protective member PT. Thickness TC42 of 4th convex part CP4 and thickness TC52 of 5th convex part CP5 are smaller than thickness TC31 of 3rd convex part CP3. For example, the thicknesses TC42 and TC52 are the same.
According to the third modification, the tensile stress applied to the protection member PT differs depending on the position. That is, since the thickness of the protective member PT differs depending on the position, the applied tensile stress differs depending on each convex portion. Therefore, the bending stress applied to the entire protective member PT can be further reduced, and the same effect as that of the above-described embodiment can be obtained.

FIG. 13 is a cross-sectional view showing an example of the state in which the third area AR3 of the display panel PNL according to the modification 4 is not bent.
In the example shown in FIG. 13, the surface PF1 of the protection member PT is formed in a substantially rectangular wave shape. The cross-sectional shapes of the first to fifth convex portions CP1 to CP5 are each formed such that the top is flat. The bottoms of the sectional shapes of the fourth to seventh concave portions RE4 to RE7 are formed flat.

In the example shown in FIG. 13, the tops VT1 to VT5 have a constant width in the second direction Y. The widths of the tops VT1 to VT5 may be the same or different. The bottom BT4 to the bottom BT7 have a constant width in the second direction Y. The widths of the bottom portion BT4 to the bottom portion BT7 may be the same or different.
According to the fourth modification, the same effect as that of the above-described embodiment can be obtained.
Although the display device DSP is an organic electroluminescence (EL) display device in the above-described embodiment and modification, it may be a liquid crystal display device.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DSP: Display device PNL: Display panel DA: Display area NDA: Non-display area CM: Cover member 50: Holding member 6: Signal wiring PT: Protection member BD1: First boundary portion BD2: Second boundary portion BD3: Third boundary Department.

Claims (13)

A support substrate having a first support substrate and a second support substrate spaced from the first support substrate;
A third region provided on the support substrate and located between a first region corresponding to the first support substrate, a second region corresponding to the second support substrate, and the first region and the second region. An insulating substrate having a region;
And a signal wiring provided on the insulating substrate and extending from the first area to the second area,
The signal wiring is covered by a protective member at least in the third region,
The protective member has a first distance from a boundary between the second region and the third region, and a second distance between the first convex portion formed at a first distance from the boundary between the first region and the third region and the second region. And a second convex portion formed by opening.   The display device according to claim 1, wherein the first distance and the second distance are the same distance.   The display device according to claim 1, wherein the support substrate is not provided at a position corresponding to the third area.   The display device according to any one of claims 1 to 3, wherein the thickness of the first convex portion and the thickness of the second convex portion are the same. Further, a third convex portion separated from the first convex portion toward the second region by the first distance and separated from the second convex portion to the first region side by the second distance Have
The display device according to any one of claims 1 to 4, wherein the third convex portion is located substantially at the center of the third region.   And a fourth convex portion formed at the boundary between the first area and the third area, and a fifth convex portion formed at the boundary between the second area and the third area. The display device according to claim 5.   The display device according to claim 5, wherein a thickness of the third convex portion is smaller than a thickness of the first convex portion and the second convex portion.   The display device according to claim 6, wherein a thickness of the fourth convex portion and the fifth convex portion is smaller than a thickness of the first convex portion and the second convex portion.   The display device according to claim 6, wherein a thickness of the fourth convex portion and the fifth convex portion is smaller than a thickness of the third convex portion.   The display device according to any one of claims 1 to 9, wherein the first convex portion and the second convex portion extend in a first direction intersecting the direction in which the signal wiring extends.   The display device according to claim 6, wherein cross-sectional shapes of the first to fifth convex portions are formed in a curved shape. A display panel having a first area having a display area, a second area having a terminal portion, and a third area located between the first area and the second area,
The display panel has a wire and a protective member facing the wire in the third region,
The display device, wherein the surface of the protective member is formed in a wave shape having periodic convex portions and concave portions.   The display device according to claim 11, wherein the surface of the protective member is different in thickness of the adjacent protrusion.

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