JP2011047976A - Electrooptical device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrooptical device that compatibly achieves securement of reliability and narrowing of a frame. <P>SOLUTION: The thickness of each of two glass substrates constituting a display panel 18 is set to ≤50 μm while microcracks are not caused at a periphery, so that the display panel can be bent at an almost right angle. The display panel 18 is held while the ends of respective sides of its frame area F abut on a sidewall 55 of a housing 52 by bending the right and left sides of the frame area F to a supporting frame 50 side from the vicinity of the periphery of a display area V while the back side of the display area V is supported by a supporting part 51 of the supporting frame 50. Namely, the frame area F is bent to the supporting frame 50 side while the ends of the frame area F abut on the sidewall 55 of the housing 52, thereby the length in terms of plane of the frame area is shortened. Furthermore, the frame area F is constituted to be bent, thereby the length of the frame area F is made long enough to secure the reliability. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an electro-optical device and an electronic apparatus including the electro-optical device.

Organic EL (Electro Luminescence) display devices, which are self-luminous devices, are easier to make thinner than liquid crystal display devices that require lighting devices such as backlights. Has been proposed.
For example, Patent Document 1 proposes an organic EL display device in which an organic EL layer is sandwiched between two glass substrates thinned to 100 μm or less. According to the display device, since the organic EL layer is sandwiched between two glass substrates having excellent barrier properties, moisture can be prevented from entering the organic EL layer and durability can be improved. It is said. Further, the glass substrate can be made flexible by making it thinner.

  Similarly, Patent Document 2 discloses a liquid crystal display device in which a glass substrate is thinned to realize flexibility. According to this document, when a thin liquid crystal display device is bound and used in a notebook or notebook, even if an external force such as dropping or bending is applied, the external force can be released by utilizing flexibility. It is possible to prevent fatal damage such as cracks. In addition, the flexibility of the liquid crystal display device is presumed to be flexible enough to make the whole from the description and the form of the drawings.

In such a display device, a driving circuit for driving a plurality of pixels formed in the display area and wirings are formed in a peripheral portion of the display area, that is, a so-called frame area.
In the case of an organic EL display device, in order to prevent moisture from entering from the peripheral edge of the glass substrate, the frame region is lengthened and the sealant is sufficiently filled. In other words, the frame region also functions as a barrier layer to ensure reliability (lifetime).
On the other hand, narrowing of the picture frame has been sought as market needs. This is because, in an electronic device in which a display device is incorporated, if the frame area is wide, the planar size of the electronic device increases accordingly.

JP 2005-19082 A Japanese Patent No. 4131639

However, the conventional display device has a problem that it is difficult to realize a narrow frame. Specifically, there is a trade-off between narrowing the frame and ensuring reliability, and it is difficult to ensure reliability if the frame area is shortened, while on the other hand, if the length of a certain frame area is secured, it will not become a narrow frame. There was a problem. In other words, the conventional display device has a problem that it is difficult to achieve both reliability and narrowing of the frame. Further, even if the display device has flexibility, the frame area does not shorten by this, so it is still difficult to realize a narrow frame.
Further, even if the display device is flexible enough to bend the entire display device as disclosed in Patent Document 2, it can only be used for binding to a notebook or a notebook, and is flexible. It was hard to say that it was fully utilized. In other words, the conventional display device merely adds flexibility to the thin display device, and does not propose a new application because it has flexibility.
That is, there is a problem that an effective use due to flexibility is not found.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following application examples or forms.

(Application example)
A display panel formed by forming an electro-optic layer on which a plurality of pixels are formed on a glass substrate having a thickness of 50 μm or less; and a support frame that supports the display panel. The support frame includes a plurality of pixels A support part for supporting at least a part of the formed display area and a storage part for storing at least one side of the frame area formed outside the display area are formed, and one side of the display area An electro-optical device, wherein the electro-optical device is bent from the vicinity of the peripheral edge toward the support frame, and at least a part of the frame region is held in contact with the side wall of the storage portion.

According to the findings from various experimental results conducted by the inventors, bending near a right angle is realized by setting the thickness of the glass substrate to 50 μm or less in the state where microcracks are not generated in the peripheral portion. I understand that I can do it. In addition, the bending close to the right angle state refers to an aspect that can be regarded as being bent substantially at a right angle macroscopically, although the angle R due to bending exists. This application example has been derived after the ingenuity based on this knowledge, and realizes narrowing of the frame by making use of this flexibility.
According to this electro-optical device, since the thickness of the glass substrate on which the electro-optical layer is formed is set to 50 μm or less, the display panel can be bent at a substantially right angle.
In the display panel, at least a part of the display area is supported by the support part, and at least one side of the frame area is bent from the vicinity of the peripheral part of the display area toward the support frame, so that at least a part of the frame area is obtained. Is held in contact with the side wall of the storage portion.
In other words, since the end portion of one side of the frame region is in contact with the side wall of the storage portion and is bent toward the support frame, the planar length of the frame region can be visually reduced.
Accordingly, it is possible to provide an electro-optical device that realizes a narrow frame.

Furthermore, since the frame region is bent, the length of the frame region can be set to a length necessary for ensuring reliability.
Therefore, it is possible to provide an electro-optical device capable of ensuring both reliability and narrowing the frame.
Further, by making the display panel flexible enough to be bent substantially at a right angle, it is possible to realize a narrow frame with high market needs.
Therefore, it is possible to propose an effective use of the electro-optical device by having flexibility. In other words, it is possible to provide an electro-optical device that realizes a narrow frame using flexibility.

The side wall is preferably formed integrally with the support frame and in a direction intersecting the surface including the display area.
Further, in a side view, an angle formed by the surface including the display area and the bent portion with respect to the bent side is within a range of 90 to 120 degrees, and the glass substrate is bent at the bent portion. The radius is preferably 1.8 mm or less.
In addition, the display device includes: a display panel formed by forming an electro-optical layer having a plurality of pixels on a glass substrate having a thickness of 50 μm or less; and a support substrate that supports the display panel from the glass substrate side. When the surface on the display panel side is the front surface and the surface opposite to the front surface is the back surface, at least one side of the frame region formed outside the display region in which a plurality of pixels are formed in the display panel is the periphery of the display region It is preferable to be folded back from the vicinity of the part to the back side of the support substrate.

A first adhesive layer for adhering and supporting the display panel is provided on the surface of the support substrate, and a second adhesive layer for adhering the folded one side is provided on the back surface. It is preferable that the bending radius of the glass substrate in the portion is substantially the same radius as the half of the thickness of the support substrate plus the thickness of the first adhesive layer and the second adhesive layer.
When the glass substrate is the first substrate, the display panel further includes a second substrate made of a glass substrate having substantially the same thickness as the first substrate, and the electro-optic layer includes the first substrate and the second substrate. It is preferable that it is pinched | interposed between.
Further, it is preferable to further include a resin film that covers and laminates the display panel from the first substrate side and the second substrate side.
In addition, a pixel circuit including a driving circuit for displaying and driving a plurality of pixels is formed in the frame area of the display panel, and a pixel and a pixel are included in a bent portion or a bent portion. It is preferable that a wiring portion for connecting the circuit is formed.

Moreover, it is preferable that the length of the folded part or the folded part is secured to 2 mm or more.
Moreover, it is preferable that the folded part or the folded part is formed on two opposing sides in the frame region.
The electro-optical layer is preferably an organic EL layer including an organic light emitting layer.

An electronic apparatus comprising the electro-optical device described above as a display unit.
An electronic apparatus comprising: a plurality of electro-optical devices as described above, and a display portion formed by tiling such that the folded portions of the plurality of electro-optical devices or the folded portions are adjacent to each other .

(A) The top view which shows the one aspect | mode of the display apparatus which concerns on Embodiment 1, (b) is a sectional side view in the ee cross section of (a), (c) is the enlarged view of the i section in (b). The top view of a display panel. The side sectional view in the jj section of FIG. The graph which showed correlation with the thickness of a glass substrate, and permissible bending radius (R). The perspective view of a support frame. (A) The top view which shows the one aspect | mode of the display apparatus which concerns on Embodiment 2, (b) is a sectional side view in the s cross section of (a), (c) is the enlarged view of the l section in (b). (A) The top view of the display panel in a single-item state, (b) The manufacturing mode figure of a lamination process. (A), (b) Action | operation explanatory drawing of a laminate structure. The perspective view which shows the mobile telephone as an electronic device. The top view which shows the vehicle-mounted meter as an electronic device. FIG. 6 is a side sectional view of a display panel according to Modification Example 1. FIG. 10 is a side sectional view of a display panel according to Modification 3.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following drawings, the scale of each layer and each part is different from the actual scale so that each layer and each part can be recognized on the drawing.

(Embodiment 1)
"Overview of display device"
FIG. 1A is a plan view showing one mode of a display device according to the present embodiment, and FIG. 1B is a side cross-sectional view taken along the line ee of FIG. FIG.1 (c) is an enlarged view of the i section in (b).
First, an outline of the display device 100 as an electro-optical device according to Embodiment 1 of the present invention will be described.

The display device 100 is a thin organic EL display device, and includes a support frame 50 and a display panel 18 set on the support frame. The display panel 18 is an organic EL panel in which an organic EL layer is sandwiched between a pair of sufficiently thin glass substrates, and has a flexibility that can be bent almost at a right angle. The thickness and flexibility of the glass substrate will be described later.
The display panel 18 includes a display region V composed of a plurality of pixels arranged in a matrix. In the display area V, red (R), green (G), and blue (B) color pixels are periodically arranged, and a full color image is displayed by display light emitted from each pixel. Note that the display panel is not limited to a display panel that performs color display, and may be a display panel that performs monochrome display. The display area V has a vertically long rectangle. In each drawing including FIG. 1, the vertical direction is defined as the Y-axis direction, and the horizontal direction shorter than the vertical direction is defined as the X-axis direction. The thickness direction of the display panel 18 is the Z-axis direction. Further, the Y-axis (+) and (−) directions are defined as the vertical direction, and the X-axis (−) and (+) directions are defined as the horizontal direction.

The outer shape of the display device 100 is a rectangle that is vertically longer than the display region V.
Here, the length (width) from the display region V to the outer shape is shorter (narrower) in the horizontal direction than in the vertical direction. In other words, the lateral direction is narrowed.
Specifically, the length from the display area V in the horizontal direction to the left and right sides of the outer shape is the length u2, and this length u2 is the length from the display area V in the vertical direction to the upper side of the outer shape. The length is shorter than u1 and the length u3 from the display region V to the lower side of the outer shape.
In particular, since the frame length u2 in the horizontal direction is less than half of the length u1, this horizontal direction is used when the horizontal direction is desired to be refreshed in design or when display devices are arranged in the horizontal direction. The display device 100 having a narrowed frame can be preferably used.

In this lateral narrowing, the left and right sides of the frame area F of the display panel 18 are stored in a folded state in the storage portion 52 of the support frame 50 as shown in FIGS. Has been realized. Specifically, the display panel 18 has the back surface of the display area V fixed to the support portion 51 of the support frame 50 by the adhesive layer 60, and the left and right sides of the frame area F are bent at an angle close to a substantially right angle to the Z-axis side. In this state, it is set on the support frame 50.
In this way, by storing the left and right sides in a state of being bent at an angle close to a substantially right angle, the length of the left and right frame regions F is reduced in plan view, thereby realizing a narrow frame in the horizontal direction. In the present embodiment, an example in which the left and right sides of the frame region F are narrowed as a preferred example will be described. However, the present embodiment can be applied to a case where one or more sides are narrowed according to the design and application. it can.

"Detailed configuration of the display panel"
FIG. 2 is a plan view of the display panel and corresponds to FIG.
Next, a detailed configuration of the display panel will be described with reference to FIGS.

FIG. 2 is a plan view of the display panel 18 in a single product state, in which the left and right sides of the frame region F are extended. In other words, a plate-like state before being set on the support frame 50 is shown.
The display panel 18 has a configuration in which an element substrate 1 made of a glass substrate and a counter substrate are bonded together, and an overhang region in which the element substrate 1 extends from the counter substrate is formed on the lower side.
A flexible substrate 20 is connected to the overhang region. The flexible board is an abbreviation for a flexible printed circuit board having flexibility in which an iron foil wiring or the like is formed on a polyimide film base. In addition, a driving IC (Integrated Circuit) 21 is mounted on the flexible substrate 20, and a plurality of terminals for connection to a dedicated controller or an external device (none of which are shown) are formed at the end thereof. Has been.
The display panel 18 displays images, characters, and the like in the display region V by receiving control signals including power and image signals from an external device via the flexible substrate 20.

In the present embodiment, a frame area from the display area V to the outer shape of the display panel 18 is defined as a frame area F. On the overhang area side, a frame area F is a portion outside the display area V and where the element substrate 1 and the counter substrate overlap each other. In other words, a frame-like region excluding the display region V in the overlapping portion between the element substrate 1 and the counter substrate is defined as a frame region F.
As shown in FIG. 2, in the initial state, the lengths of the four sides of the frame region F are set to be the same with a dimension k1 on all four sides. Of these, when the left and right sides are bent and the display panel 18 is set on the support frame 50, as shown in FIG. 1A, the planar lengths of the left and right sides are both the dimension k2.
In FIG. 2, portions indicated by dot hatches along the left and right sides of the display panel 18 are portions that are bent along with the bending when being set on the support frame 50, and are set as a bending area m. In addition, it is set as the state which became 0 degree or more with respect to the X-axis direction with curving.

FIG. 3 is a side sectional view of the display panel 18 of FIG.
The display panel 18 includes an element substrate 1, an element layer 2, a planarizing layer 4, a pixel electrode 6, a partition wall 7, an organic EL layer 8 as an electro-optic layer, a common electrode 9, an electrode protective layer 10, a buffer layer 11, and a gas barrier layer. 12, a filler 13, a CF layer 14, a counter substrate 16, and the like. A portion sandwiched between the element substrate 1 and the counter substrate 16 is referred to as a functional layer 17. In other words, the laminated structure from the element layer 2 to the CF layer 14 is referred to as a functional layer 17.
The element substrate 1 is made of transparent inorganic glass. In this embodiment, alkali-free glass is used as a suitable example.
In the element layer 2, a pixel circuit for actively driving each pixel is formed. The pixel circuit includes a selection transistor for selecting a pixel made of a TFT (Thin Film Transistor), a driving transistor 3 for flowing a current to the organic EL layer 8, and the like, which are formed corresponding to each pixel. Has been. The pixel circuit uses low-temperature polysilicon as the active layer as a preferred example, but may have a configuration using amorphous silicon as the active layer.

In the upper layer (Z-axis (−) direction) of the element layer 2, for example, a planarization layer 4 that is an insulating layer made of an acrylic resin or the like is formed.
The reflective layer 5 and the pixel electrode 6 are laminated in this order on the flattening layer 4 so as to be divided for each pixel. The reflection layer 5 is a reflection layer made of, for example, aluminum, and reflects light traveling from the organic EL layer 8 toward the element substrate 1 to make light that contributes to display.
The pixel electrode 6 is composed of a transparent electrode such as ITO (Indium Tin Oxide) or ZnO, and is connected to a drain terminal of the driving transistor 3 of the element layer 2 and a contact hole penetrating the planarization layer 4 for each pixel. ing.
The partition wall 7 is made of a photocurable black resin or the like, and partitions each pixel in a lattice shape in a plane. Note that the pixel circuit including the driving transistor 3 in the element layer 2 is disposed so as to overlap the partition in a planar manner in order to prevent malfunction due to light.

The organic EL layer 8 is formed so as to cover the pixel electrode 6 and the partition wall 7. In FIG. 3, the structure is a single layer. Actually, each layer is composed of a hole transport layer, a light emitting layer, an electron injection layer, and the like made of an organic thin film. Are stacked. The hole transport layer is made of a sublimable material such as aromatic diamine (TPAB2Me-TPD, α-NPD). The light emitting layer is composed of an organic light emitting material thin film composed of a multilayer that emits white light formed by combining three colors of red, green, and blue. The electron injection layer is made of LiF (lithium fluoride) or the like.
The common electrode 9 is a metal thin film layer in which a metal such as MgAg is formed very thin so as to transmit light. Further, a transparent conductive film such as a metal oxide such as ZnO or a metal nitride layer such as TiN may be stacked in order to lower the resistance.

Electrode protective layer 10, SiO ₂ or, Si ₃ N _4, SiOxNy transparent such, and is configured of a material having a function of blocking water by density.
The buffer layer 11 is a transparent organic buffer layer such as a thermosetting epoxy resin.
The gas barrier layer 12 is a transparent sealing layer such as SiO ₂ , Si ₃ N ₄ , or SiOxNy, and has a function of blocking moisture due to high density, and prevents moisture from entering the organic EL layer 8. Take on the function.
The filler 13 is a transparent adhesive layer made of, for example, a thermosetting epoxy resin, and fills the uneven surface between the gas barrier layer 12 and the CF layer 14 and bonds them together. Further, it also functions to prevent moisture from entering the organic EL layer 8 from the outside.

The counter substrate 16 is made of the same inorganic glass as the element substrate 1, and the CF layer 14 is formed on the organic EL layer 8 side (Z-axis (+) side).
In the CF layer 14, a red color filter 14r, a green color filter 14g, and a blue color filter 14b are arranged similarly to the pixel arrangement. Specifically, the color filters of each color are arranged so as to overlap with the corresponding pixel electrodes 6, and light shielding portions indicated by hatching are formed between the color filters. The light shielding portion is formed in a lattice shape so as to overlap the partition wall 7 in a plan view, and optically functions as a black matrix.

The counter substrate 16 and the element substrate 1 are bonded and sealed with a sealant 15 formed on the peripheral edge of the counter substrate 16. As the sealant 15, an epoxy adhesive, an ultraviolet curable resin, or the like is used.
Here, the functional layer 17 including the organic EL layer 8 is covered with the element substrate 1 made of a glass substrate having excellent barrier properties and the counter substrate 16 after the surface is covered with an inorganic gas barrier layer 12. Therefore, the barrier property against moisture intrusion from the thickness (Z-axis) direction is high.
On the other hand, the barrier configuration (layer) that prevents moisture permeation from the peripheral edge of the display panel 18 is mainly composed of the sealing agent 15 and the gas barrier layer 12, and therefore has a longer filling length of the sealing agent 15. Can improve the barrier property. In other words, the reliability (life) of the display panel 18 is determined according to the length of the frame area F.

In the frame region F, a shift register used when displaying and driving a plurality of pixels, a circuit portion n including an inspection circuit, a wiring portion connecting the circuit portion and the pixel circuit, and the like are formed. The circuit portion n and the wiring portion are built in the element substrate 1 by the same process as that of the pixel circuit.
Here, on the two left and right sides of the frame region F, a wiring portion is formed in the curved area m, and a circuit portion n is formed in a region excluding the area. In other words, the circuit part n is formed on the outer side of the partition wall 7 and outside the curved area m where the wiring part is formed.

From each pixel configured in this manner, display light corresponding to the color tone of the color filter is emitted. For example, in the case of a red pixel, white light emitted from the organic EL layer 8 is selected by the red color filter 14r and emitted from the counter substrate 16 as red display light. The same applies to green and blue pixels.
Thereby, in the display area V, a full-color image is displayed by display light from the plurality of color pixels emitted from the counter substrate 16.
The configuration of the display panel 18 is not limited to the top emission type, and may be a configuration in which an electro-optical layer is sandwiched between two glass substrates. For example, a bottom emission type organic EL display device that emits light emitted from the organic EL layer 8 from the element substrate 1 side may be used. Moreover, the inorganic EL display device provided with inorganic EL as a light source may be sufficient.

“Dimensions of each part”
Here, the optimal dimensions of each part necessary for ensuring the initial reliability (lifetime) while the display panel 18 has the flexibility described above will be described.
First, the thickness of the display panel 18 will be described.
In FIG. 3, in order to clarify the stacking relationship between the constituent parts, in particular, the scale of the functional layer 17 is enlarged as compared with other parts, but in reality, the functional layer 17 is configured to be the thinnest part. become. The thickness of the functional layer 17 is about several μm to 20 μm. Among these, the buffer layer 11 occupies more than half the thickness. Incidentally, the thickness of the organic EL layer 8 composed of a plurality of thin films with a thickness of the order of nm is less than 1 μm.

In the present embodiment, as a suitable example, the thickness of the element substrate 1 and the counter substrate 16 is about 30 μm. The total thickness of the display panel 18 is about 70 μm as a preferred example. According to the experiment results of the inventors, in order to ensure the reliability of the organic EL panel, in addition to the sealing structure such as the gas barrier layer 12, the thickness of the element substrate 1 and the counter substrate 16 is required to be about 10 μm or more. It is understood that. In other words, by setting the thicknesses of the element substrate 1 and the counter substrate 16 to about 10 μm or more, sufficient moisture resistance can be ensured.
On the other hand, if the thicknesses of the element substrate 1 and the counter substrate 16 exceed about 50 μm, the allowable bending radius increases, and the degree (effect) of the narrow frame becomes dilute (small).
For this reason, it is preferable to set the thicknesses of the element substrate 1 and the counter substrate 16 within a range of 10 to 50 μm, respectively. Moreover, it is more preferable to set it in the range of 10-30 micrometers. Furthermore, the total thickness of the display panel 18 in which the element substrate 1 and the counter substrate 16 are overlapped is preferably set within a range of 30 to 110 μm.

The element substrate 1 and the counter substrate 16 are thinned by polishing or etching each of which has a thickness of about 0.3 to 0.7 mm in the initial stage. Preferably, after manufacturing a large panel having a plurality of display panels with thick glass substrates on the front and back sides, etching is performed using an etching solution (aqueous solution) in which hydrofluoric acid (hydrofluoric acid) is dissolved. Manufacture large format panels of the desired thickness. Then, the display panel 18 is cut out from the large format panel. Note that the present invention is not limited to this method, and any method that can form the display panel 18 having a desired thickness may be used. For example, a mechanical polishing method may be used.
Here, when the display panel 18 is cut out from the large panel, a known cutting method can be used, but it is necessary to prevent microcracks from being generated in the peripheral portion of the display panel 18. This is because the display panel 18 is used in a folded state, so that it is prevented from being broken at the time of bending. For this reason, it is particularly preferable to use a laser scribing method using laser light for cutting the side including the curved area m in FIG. In addition, after cutting, it is necessary to dissolve at least the end of the curved area m with a solution such as hydrofluoric acid to eliminate the microcracks.
Further, a resin may be coated on the peripheral portion of the display panel 18 in order to protect the end face after cutting. For example, the peripheral portion is coated with an epoxy resin, an acrylic resin, a urethane resin, or a silicon resin by a dipping method.

FIG. 4 is a graph showing the correlation between the glass substrate thickness and the allowable bending radius (R). The horizontal axis indicates the thickness of the glass substrate, and the vertical axis indicates the allowable bending R.
This graph is derived from the results of various experiments conducted by the inventors, and is an important index for realizing a narrow frame. As described above, according to findings from various experimental results conducted by the inventors, it has been found that bending close to a right angle state can be realized by setting the thickness of the glass substrate to 50 μm or less.
On the other hand, even if it is possible to bend at a substantially right angle, if the bend R is too large, it becomes difficult to narrow the frame. For this reason, in the present embodiment, narrowing the frame is realized by setting the dimensions of each part using the allowable bending R as one index.

The allowable bend R is the minimum bend radius (R) allowed when a glass substrate having a predetermined thickness is bent substantially at a right angle. In other words, it is the minimum bending radius (R) that can maintain the bent state without breaking when the glass substrate is bent at a substantially right angle. In addition, when the glass substrate is folded, that is, when the glass substrate is bent 180 degrees with respect to the X-axis direction as shown in FIG. 6C, it is confirmed that the allowable bending R is substantially equal to the allowable bending R in FIG. is doing.
As shown in FIG. 4, the thickness of the glass substrate and the allowable bending R are in a substantially direct relationship, and it can be seen that the allowable bending R increases as the thickness of the glass substrate increases. In other words, as the thickness of the glass substrate increases, the degree of narrow frame becomes dilute.
FIG. 4 is a graph when a glass substrate having no microcracks is used. Incidentally, when a glass substrate including microcracks is used, the allowable bending R is extremely large even if the thickness is the same. It has been confirmed that For example, when a glass substrate having a thickness of 30 μm and including microcracks is used, the allowable bending R is about 5.5 mm, and it is difficult to narrow the frame.

In the preferred example described above, the thickness of the glass substrate is 30 μm. In this case, the allowable bending R in one glass substrate is about 0.8 mm. The actual display panel 18 has a structure in which two glass substrates are stacked. However, the allowable bending R in this structure is an allowable value when the thickness is 60 μm according to the results of experiments by the inventors. It has been confirmed that the radius is substantially equal to the allowable bending R in one glass substrate, not the bending R. This is because the main part of the functional layer 17 (FIG. 3) interposed between the two glass substrates is made of a resin such as the sealant 15 and the layer functions as a buffer layer. Yes.
Thereby, as shown in FIG.1 (c), the one side right side of the frame area | region of the display panel 18 is bent by the side of the support frame 50 by the bending R inside the element substrate 1 about 1.0 mm.

Returning to FIG.
Next, the dimensional relationship of the display panel 18 in the initial state will be described.
The length k1 of the frame region F of the display panel 18 in the preferred example is set to about 3.0 mm on all four sides. Note that the value is not limited to this value, and may be set to 2.0 mm or more according to required specifications (reliability).

Returning to FIG.
The frame region F on the right side in a state where the display panel 18 is set on the support frame 50 is in a state in which the end portion is in contact with the side wall 55 of the storage portion 52, and the rear surface of the display panel 18 (a flat portion on the outer surface of the element substrate 1). ) And bent at an angle θ. That is, in the display panel 18, the left and right sides of the frame area F are bent toward the support frame 50 from the vicinity of the peripheral edge of the display area V. Preferably, the display panel 18 is bent and bent from the curved area m to the back side of the display panel 18, and the back surface (element) of the display panel 18 is in a state where the end of the frame region F is in contact with the side wall 55 of the storage portion 52. It is bent at an angle θ from a flat portion on the outer surface of the substrate 1. The display panel 18 is bent from the curved area m and bent. However, the display panel 18 may be bent at the boundary between the display area V and the frame area F, and the area actually used for display is the surface of the display panel 18. As long as it can be visually recognized on the outer surface of the counter substrate 16, it may be bent in the display area V. Further, the frame region F may be bent as long as the apparent frame region is smaller than the conventional one. In either case, a narrow frame of the display panel 18 can be realized.
The angle θ in the preferred example is set to 110 degrees in consideration of the incorporation property. Moreover, it is not limited to this numerical value, and may be set within a range of 90 to 120 degrees according to the thickness of the display panel 18 and the required specifications (narrow frame).
In the present embodiment, an aspect that can be regarded as being bent macroscopically at a substantially right angle is such that the angle θ is in the range of 90 to 120 degrees, and the allowable bending R is 1.8 mm or less (glass substrate thickness 50 μm). The following cases are defined.
In addition, the planar length k2 of the frame region F in the preferred example is about 1.3 mm.
Further, the total thickness of the support frame 50 in the preferred embodiment is about 3.2 mm, the size of the storage portion 52 is such that the thickness t of the side wall 55 is about 0.2 mm, and the width w of the gap portion 54 is about 2.0 mm. And the depth d of the gap 54 is about 3.0 mm.

Therefore, the length u2 from the display region V to the left side of the outer shape of the display panel 18 in the preferred example is about 1.5 mm by adding the thickness t of the side wall 55 to the length k2 of the frame region F, which is the length before bending. It is about half the length of k1. The same applies to the left side of the frame area F.
Further, the total thickness of the display device 100 in the preferred example is about 3.5 mm.
Note that the dimensions of the above preferred examples are one of the preferred examples derived by the inventors from the experimental results and physical property data after creative ingenuity, and are not limited thereto. The dimensions can be appropriately set according to the size of the display panel and the application within a range not departing from the idea.

"Detailed structure of support frame"
FIG. 5 is a perspective view of the support frame.
Here, the detailed structure of the support frame 50 is demonstrated using FIG. 1 and FIG.
The support frame 50 includes a support portion 51, two storage portions 52, and the like.
The support part 51 is a plane part for supporting the back surface of the display area V of the display panel 18, and the plane part is a part of a plane including the X axis and the Y axis. Note that the present invention is not limited to supporting the entire back surface of the display area V, and any support structure that can support the display area V in a substantially flat state may be used. For example, a structure in which a plurality of holes are formed in the central portion of the support portion 51 for weight reduction and the peripheral portion of the display region V is mainly supported may be employed.
The two storage parts 52 are formed symmetrically on the left and right sides of the support part 51, respectively. In other words, symmetrical storage portions 52 are formed on the left and right sides of the support portion 51.
The accommodating part 52 is comprised from the recessed part 53, the side wall 55, etc. FIG. The concave portion 53 is a wall portion that is formed one step lower (deeper) than the support portion 51. The side wall 55 is a side wall formed in a direction substantially orthogonal to the support portion 51 and extends in the Y-axis direction. In addition, chamfering C of about 0.5 mm is formed at the corner portion connecting the support portion 51 to the recess portion 53.
A concave groove (space) surrounded by the concave portion 53 and the side wall 55 is used as the gap portion 54. The gap 54 extends in the Y-axis direction along the side wall.

The support frame 50 requires functions such as strength to reinforce the sheet-like display panel 18, heat dissipation that absorbs heat generated by the display panel 18 and transmits (releases) the same to the outside, and thinness. .
In this embodiment, as a suitable example, the support frame 50 is formed by pressing a stainless steel plate having a thickness of 0.2 mm. Specifically, SUS304CSP which is a stainless steel strip is used. Note that the material is not limited to this, and any material having the above-described functions may be used. For example, SUS301CSP, aluminum, an alloy of iron and nickel, and an invar having a small thermal expansion coefficient near room temperature, or You may use the plated steel plate which performed the plating process to the steel plate.

Moreover, it is not limited to a metal, You may form the support frame 50 with resin. When using resin, in order to ensure the strength of the support part 51, it is preferable to change the shape appropriately according to the material characteristics, such as thickening the part or inserting beams or braces on the back. As the molding method, an injection molding method or an extrusion molding method can be used.
As a specific resin, a general-purpose resin such as an ABS resin can be used, but from the viewpoint of being thin and tough, it is more preferable to use an engineering plastic such as polycarbonate, polyacetal, or polypropylene terephthalate.
Moreover, when using resin, in order to improve heat dissipation, it is preferable to perform surface treatment, such as plating, sputtering, or heat radiation coating, on the support frame 50. When performing the plating process, for example, two-layer plating of copper and nickel or three-layer plating of copper, nickel and chromium is performed on the entire surface. When performing the sputtering process, aluminum or nickel is sputtered on at least the surface of the support portion 51. When performing heat radiation coating, at least the surface of the support portion 51 is coated with a paint containing a heat conductive filler such as aluminum nitride, alumina, or silicon carbide.

"Production method"
Here, a manufacturing method for setting the display panel 18 described above to the support frame 50 and forming the display device 100 will be described.
First, the adhesive layer 60 made of double-sided tape is attached to the support portion 51 of the support frame 50. The thickness of the double-sided tape in the preferred example is 0.2 mm. In addition, it is not limited to this thickness, What is necessary is just in the range of 0.1-0.5 mm. Moreover, it is not limited to sticking a double-sided tape on the whole surface of the support part 51, The display area V should just be arrange | positioned so that support (fixation) is possible in a substantially flat state. For example, as shown by a two-dot chain line in FIG. 5, three strip-like double-sided tapes extending in the X-axis direction are arranged in stripes so as to be positioned substantially at both ends and the center of the display area V in the Y-axis direction. You may do it. According to this configuration, it is possible to reduce the generation of bubbles when the display panel 18 is attached.
Moreover, you may use the double-sided tape containing the above-mentioned heat conductive filler for heat dissipation improvement. Moreover, it is not limited to a double-sided tape, You may use the adhesive agent which has the same adhesiveness.

Subsequently, as shown in FIG. 1A, the back surface of the display area V of the display panel 18 is attached to the support portion 51 of the support frame 50.
Then, as shown in FIGS. 1B and 1C, the end portions are put into the storage portion 52 while the left and right sides in the frame region F are curved toward the Z axis (+) side. As a result, the bent ends of the left and right sides are held in contact with the side wall 55 of the storage portion 52. In addition, when putting an edge part in the accommodating part 52, it is preferable to prevent the crack accompanying accommodation using the exclusive jig | tool which can hold | grip the edge of the frame area | region F uniformly.
Alternatively, the left and right sides of the frame region F may be stored in the storage unit 52 in a state where the entire display panel 18 is curved in an arch shape, and the back surface of the display region V may be attached to the support unit 51.
In this way, the left and right sides in the frame region F are stored in the storage portion 52, and the radius of the curved surface (bending portion) starting from the peripheral portion of the display region V is set as shown in FIG. It is held in a state where the bending R is slightly larger than the allowable bending radius.

As described above, according to the display device 100 according to the present embodiment, the following effects can be obtained.
Since the thickness of the two glass substrates constituting the display panel 18 is set to 50 μm or less in a state where no microcracks are generated in the peripheral portion, the panel can be bent substantially at a right angle. It has become.
In the display panel 18, the left and right sides of the frame area F are bent from the vicinity of the peripheral edge of the display area V toward the support frame 50 in a state where the back surface of the display area V is supported by the support portion 51 of the support frame 50. The end of each side is held in contact with the side wall 55 of the storage portion 52.
That is, since the frame region F is bent toward the support frame 50 in a state in which the end portion of the frame region F is in contact with the side wall 55 of the storage portion 52, the planar length of the frame region is shortened.
Accordingly, it is possible to provide the display device 100 that realizes a narrow frame. In other words, it is possible to provide the display device 100 that realizes a narrow frame using flexibility.

Furthermore, since the thickness of the two glass substrates in the preferred example is set to about 30 μm or less, the allowable bending R as the display panel 18 is about 0.8 mm.
In the display device 100 in the preferred example, the bending R is about 1.0 mm by optimizing the dimensions of the storage portion 52 of the support frame 50 in consideration of the allowable bending R and durability of the display panel. The lengths u2 from the display area V to the left and right sides of the outer shape of the display panel 18 are each about 1.5 mm. This dimension is about half the length k1 (about 3.0 mm) of the frame region F before bending, and a narrow frame in the lateral direction is realized.
Furthermore, by adopting a configuration in which the frame region F is bent, the length of the frame region F can be set to a length necessary for ensuring reliability.
That is, it is possible to realize a narrow frame while ensuring the length of the frame area necessary for ensuring reliability.
Therefore, it is possible to provide the display device 100 that achieves both reliability and narrowing of the frame.

Further, the present invention is not limited to the above dimensions, and the frame region F can be bent macroscopically at a substantially right angle if the bending angle θ is within a range of 90 to 120 degrees and the allowable bending R is 1.8 mm or less. Can be considered. In other words, a certain narrow frame can be realized.
Accordingly, it is possible to provide the display device 100 that realizes a narrow frame.
Further, since the wiring part is selectively formed in the curved area m of the frame area F and the circuit part n is formed in the area excluding the area, damage to the circuit part n due to bending can be prevented. .
Therefore, the display device 100 with high reliability can be provided.

Further, since the support frame 50 is formed using a stainless plate having a thermal conductivity higher than that of resin or glass, heat generated by the display panel 18 can be efficiently absorbed and radiated to the outside. Furthermore, the material thickness can be reduced as compared with the case of molding with resin. In particular, since the side wall 55 can be configured to be thin, the frame can be further narrowed.
Therefore, it is possible to provide a display device 100 with a narrow frame that is excellent in heat dissipation.
Moreover, since the support frame 50 can be efficiently manufactured by press working, component costs can be suppressed.
Furthermore, the total thickness (from the bottom surface of the storage unit to the top surface of the display panel 18) of the display device 100 in the preferred example can be configured as thin as about 3.5 mm. In addition, as shown in FIG. 1B, the back surface of the support portion 51 has a recessed shape (space), and therefore the space can be used effectively when it is incorporated into an electronic device.

(Embodiment 2)
FIG. 6A is a plan view illustrating an aspect of the display device according to the second embodiment, and FIG. 6B is a side cross-sectional view taken along the line ss in FIG. FIG. 6C is an enlarged view of a portion l in FIG. 6A to 6C correspond to FIGS. 1A to 1C, respectively.
FIG. 7A is a plan view of the display panel and corresponds to FIG.
Hereinafter, the display device 110 according to Embodiment 2 of the present invention will be described. In addition, about the component same as Embodiment 1, the same number is attached | subjected and the overlapping description is abbreviate | omitted.
The display device 110 according to the present embodiment has a structure in which the left and right frame regions are folded using the display panel 28 having a structure in which the display panel 19 having a wider width than the display panel 18 according to the first embodiment is laminated from the front and back surfaces with a resin film. By adopting the display device, the display device has a narrower frame than the display device 100 of the first embodiment.

The display device 110 includes a support substrate 58, a display panel 28, and the like.
The support substrate 58 is a metal flat plate whose horizontal width (length in the X-axis direction) is substantially the same as the horizontal width of the display area V of the display panel 19 and whose vertical length is slightly longer than the external length of the display panel 19. . In this embodiment, an aluminum plate is used as a suitable example. In addition, it is not limited to this material, You may use the various metals demonstrated in Embodiment 1. FIG. Further, various resins described in the first embodiment may be used, or resin plates subjected to various surface treatments such as plating may be used.
The display panel 28 has a configuration in which the display panel 19 is laminated with resin films 25 a and 25 b from the surface on the counter substrate 16 side and the surface of the element substrate 1. In other words, resin films 25a and 25b for laminating the display panel 19 from the front and back surfaces are provided. Since the laminated resin films 25 a and 25 b are integrated with the display panel 19, the laminate of the two resin films is also referred to as a laminate structure 25.
6B and 6C, the back surface of the display area V of the display panel 28 is attached to the surface of the support substrate 58 with the adhesive layer 60, and the left and right sides of the frame area F are It is folded back from the vicinity of the peripheral edge of the display area V to the back side of the support substrate 58. Preferably, the display panel 19 starts to be bent from the curved area m to the back side of the support substrate 58. The starting point of the bending is not limited to the configuration in which the bending is started from the bending area m, and the bending may be performed at the boundary between the display area V and the frame area F, and the area actually used for display is the surface of the display panel 19. As long as it can be visually recognized on the outer surface of the counter substrate 16, it may be bent in the display area V. Further, the frame region F may be bent as long as the apparent frame region is smaller than the conventional one. In any case, since the frame area F is folded back to the back surface, the display panel 19 can be narrowed.
With this configuration, as shown in FIG. 6A, the planar length of the left and right frame regions F is a length k3 that is shorter than the length k2 in the display device 100 of the first embodiment.

FIG. 7A is a plan view of the display panel 28 in a single product state, in which the left and right sides of the frame region F are extended. In other words, a flat state before being set on the support substrate 58 is shown.
The display panel 19 is different from the display panel 18 of the first embodiment only in that the width is wide. Specifically, the left and right lengths of the frame region F are the length k5 longer than the length k1. Further, the horizontal width of the curved area m is ensured at least twice that of the display panel 18 of the first embodiment.
The planar size of the laminate structure 25 is slightly larger than the display panel 19 by the amount of glue (laminate). Specifically, all four sides are larger than the outer shape of the display panel 19 by a length (width) u5. That is, the margin is provided for the entire length of the display panel 19 by a length (width) u5.
The flexible substrate 20 is formed long on the Y-axis (−) side of the margin, and is set so that the driving IC 21 is exposed (extruded) from the laminate structure 25.
The display panel 28 may be used as the display panel of the first embodiment. Even with this configuration, the same effects as those of the first embodiment can be obtained.

"Materials of resin film"
Returning to FIG.
Here, the material of the two resin films 25a and 25b constituting the laminate structure 25 will be described.
The resin films 25a and 25b covering and laminating the display panel 19 have adhesiveness to a glass substrate, flexibility, transparency (light extraction property), moldability (insulation and heat resistance) of the flexible substrate 20, and the inside. Functions such as water resistance to prevent moisture intrusion are required.
In order to satisfy these functions, the resin films 25a and 25b are preferably made of a resin based on polyethylene having water resistance (low water absorption), insulation, flexibility, transparency, and low-temperature weldability. Moreover, it is more preferable that it is a copolymer partially having a polar group in order to improve adhesiveness.
In the present embodiment, as a suitable example, an ethylene-vinyl acetate copolymer (EVA), which is a kind of polyethylene copolymer, is employed as the material of the resin films 25a and 25b.

In addition, it is not limited to EVA, What is necessary is just a polyethylene-type copolymer which has the same function.
For example, polyethylene terephthalate (PET), ethylene-hydroxyalkyl methacrylate copolymer, ethylene-alkoxyethyl methacrylate copolymer, ethylene-aminoethyl methacrylate copolymer, ethylene-hydroxyglycidyl methacrylate copolymer, ethylene -It is preferable to use any one of vinyl alcohol copolymer (EVOH), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), and ethylene-alkyl acrylate copolymer. Alternatively, a copolymer obtained by combining two or more of these (for example, an ethylene-vinyl acetate-vinyl alcohol copolymer is a copolymer excellent in adhesion between both glass and CFRP), or a mixture is used. There may be.

  Moreover, in order to improve heat resistance, you may contain hardening components, such as amine compounds, such as an epoxy compound, an isocyanate compound, and a polyethyleneimine, as a crosslinking agent. In addition, when using the material which has the carboxyl group which is not esterified among ethylene copolymers, such as ethylene-acrylic acid copolymer (EAA) and ethylene-methacrylic acid copolymer (EMAA), low-temperature weldability However, it is preferable to crosslink by heat in combination with a crosslinking component such as an epoxy-based curing agent so that acrylic acid does not remain.

"Lamination method of display panel"
FIG.7 (b) is a figure which shows the manufacture aspect of a lamination process.
Here, a method for manufacturing the display panel 28 will be described in detail.

First, each member is put in a superimposed state (preparation body) and set in a laminating apparatus. Specifically, the display panel 19 and the resin film 25a are overlaid in this order on the resin film 25b. Although this step is performed under a normal environment as a suitable example, it may be performed under a reduced pressure environment described later.
A transparent adhesive may be applied in advance to the inner surfaces of the resin films 25a and 25b (the surface on the display panel 19 side). Examples of adhesives include thermosetting adhesives such as epoxy, urethane, and nylon, rubber flexible adhesives such as SBR, chloroprene, and nitrile rubber, or acrylic and synthetic rubber pressure sensitive. An adhesive or the like can be used.
Then, the preparation is set in the laminating apparatus. FIG. 7B shows only the pressure rollers 81 and 82 of the laminating apparatus.

Subsequently, the environment in which the laminating apparatus and the preparation body are installed is decompressed to obtain a decompressed environment. The laminating apparatus is installed in a chamber apparatus (room) that can set the internal environment to a desired atmospheric pressure environment. By this step, air (bubbles) inside the preparation body is removed (defoamed).
Further, in parallel, the pressure rollers 81 and 82 are heated, and the roller surface made of a heat-transferable elastomer is heated to a temperature of 80 to 120 ° C.
Subsequently, as shown by the arrow in FIG. 7B, the preparation body is inserted between the pair of pressure rollers 81 and 82 from one side of the preparation body on the opposite side of the flexible substrate 20, and lamination is performed. . In the portion sandwiched between the pressure rollers 81 and 82, the resin films 25a and 25b are dissolved by the heat of the rollers, and are further pressurized and bonded to each other. Further, the dissolved resin film functions as an adhesive (filler) and covers and adheres to the display panel 19 and the flexible substrate 20. In other words, each part of the resin film in which the adherend is dissolved is laminated integrally.
In addition, since the lamination is performed from one side to the other end of the preparation body, even if bubbles (air) remain in each member, the bubbles are pushed out to the other end side in the order of lamination. Then, as shown in the drawing, the laminated display device 110 is pushed out between the pressure rollers 81 and 82 to complete the lamination.

  Note that the laminating apparatus is not limited to the roll laminating system including the pair of pressure rollers 81 and 82, and any apparatus that can laminate the prepared body to the completed state of the display device 110 may be used. For example, using a diaphragm-type vacuum laminating apparatus in which a preparation body is set on one plate-like heating plate (hot plate), a deformed rubber sheet is pressed against the preparation body by a pressure difference, and heated and pressurized. Also good.

"Operation of laminate structure"
8 (a) and 8 (b) are diagrams for explaining the operation of the laminate structure. FIG. 8B corresponds to FIG.
Here, the effect | action regarding bending tolerance by having laminated the display panel 19 by the laminate structure 25 is demonstrated.
The laminate structure 25 has an effect of improving bending resistance in addition to an effect of wrapping the display panel 19 to prevent moisture from entering from the outside and softening a mechanical impact.
Specifically, the laminate structure 25 is heated when laminating and then naturally cooled. Therefore, the laminate structure 25 is always shrunk at room temperature after cooling, as indicated by an arrow in FIG. It is in a state where the shrinkage stress is working.

After laminating, the shrinkage stress on the front and back surfaces is offset in a state where the laminating structure 25 is fixed at the marginal margin. In other words, since the shrinkage stress on the front and back surfaces is balanced, the display panel 28 is kept flat.
According to the findings from the experiment results of the inventors, it has been confirmed that this shrinkage stress has the same action as the compressive stress layer formed on the front and back of the tempered glass. In other words, when a tensile force is applied to break the tempered glass (display panel), the compressive stress layer (laminate structure) on the surface works to counteract this, compared with the case where the layer is not formed. And more than double the strength performance.

Also, this action has been found to work effectively, particularly at the bends.
For example, as shown in FIG. 8B, when the display panel 28 is bent, tensile stress is generated in the curved portion of the internal display panel 19 as indicated by the inner arrow. For example, when there is a microcrack at the end of the curved portion, the tensile stress acts in a direction to spread the microcrack.
On the other hand, shrinkage stress is acting on the curved portion of the laminate structure 25 as indicated by the outer arrow. This shrinkage stress acts in a direction to suppress the internal display panel 19 from being bent excessively. For example, when there is a microcrack at the end of the curved portion of the display panel 19, the microcrack acts so as not to expand.
Here, since the material and the thickness of each part in the display panel 28 are set so that the shrinkage stress is larger than the tensile stress, the laminate structure 25 is used for lamination rather than the display panel 19 alone. The display panel 28 has better bending resistance. In other words, since the display panel 28 has excellent bending resistance, the display panel 28 can also be used for bending (turning back) at 180 degrees as shown in FIG.

"Dimensions of each part and manufacturing method"
Returning to FIG.
Here, the optimal dimension of each part is demonstrated.
First, the dimensional relationship of the display panel 19 in the initial state will be described. The thickness of the display panel 19 is the same as that described in the first embodiment.
The length k5 of the left and right frame regions F of the display panel 19 in the preferred example is set to about 8.0 mm on both sides. This is because the length of the curved portion is approximately doubled compared to the bending mode of FIG. 1C and a margin for pasting to the back surface of the support substrate 58 after folding is required. It is. Note that the length k1 of the upper and lower frame regions F is about 3.0 mm.

Returning to FIG.
Next, the thickness of the resin films 25a and 25b constituting the laminate structure 25 and the total thickness of the display panel 19 will be described.
In the present embodiment, as a suitable example, an EVA film having a thickness of about 50 μm is used for the resin films 25a and 25b. According to the experiment results of the inventors, a thickness of about 20 μm or more is necessary to satisfy the coverage (fillability) of the step including the gap at the peripheral edge of the display panel 19 and to secure the contraction stress. I know that
Considering the balance between these characteristics and the total thickness of the display device 110, it is preferably in the range of 20 to 100 μm. Moreover, when the cost of a resin film and the ease (workability | operativity) of a lamination are considered, it is more preferable to exist in the range of 40-80 micrometers.
Further, the total thickness of the display panel 19 formed by laminating the thickness portions according to the above-described preferred examples is about 170 μm.

Next, the dimensions of each part related to the folded portion will be described.
The thickness of the support substrate 58 in the preferred example is about 1.5 mm.
Moreover, the adhesive layers 60 and 61 in a suitable example use the double-sided tape, The thickness is both 0.2 mm. In addition, it is not limited to this thickness, What is necessary is just in the range of 0.1-0.5 mm. Moreover, you may use an adhesive agent similarly to description in Embodiment 1. FIG.
Further, the total thickness of the support substrate in the preferred example plus the adhesive layers 60 and 61 is about 1.9 mm.

Here, a manufacturing method for setting the display panel 19 on the support substrate 58 and forming the display device 110 will be described.
First, the adhesive layer 60 is attached to the surface of the support substrate 58. In addition, it is not limited to sticking a double-sided tape on the whole surface, It is just like description in Embodiment 1 that the display area V should just be arrange | positioned so that support (fixation) is possible in a substantially flat state.
Next, as shown in FIG. 6B, the back side of the display area V of the display panel 28 is attached to the surface of the support substrate 58.
6B and 6C, the left and right sides in the frame region F are folded back to the Z-axis (+) side, and the folded portion is attached to the back surface of the support substrate 58 with the adhesive layer 61. . The adhesive layer 61 is preferably attached to the support substrate 58 in advance. Further, when folding, no crease is made, and the folded portion is folded so as to be naturally curved according to the thickness of the support substrate 58.

As a result, as shown in FIG. 6C, the frame region F is curved around the substantially center of the end surface of the support substrate 58, and the folded portion is fixed to the back surface of the support substrate 58.
At this time, the bend R on the inner side of the element substrate 1 is about 1.0 mm on the right side of the frame region F in the display panel 19. This value is larger than the allowable bending R described with reference to FIG.
Further, the length k3 of the left and right frame regions F of the display device 110 (display panel 28) in this completed state is about 1.1 mm, which is longer than the length k2 (about 1.3 mm) of the same part in the first embodiment. It is getting shorter. In addition, the difference becomes more remarkable compared with the length u2 (about 1.5 mm) of the left and right frame regions as the display device 100 of the first embodiment.
The total thickness of the display device 110 is about 2.3 mm, which is thinner than the total thickness (about 3.5 mm) of the display device 100 of the first embodiment.
Note that the dimensions of the above preferred examples are one of the preferred examples derived by the inventors from the experimental results and physical property data after creative ingenuity, and are not limited thereto. The dimensions can be appropriately set according to the size of the display panel and the application within a range not departing from the idea.
Note that the display panel 19 in which the laminate structure is omitted may be used as the display panel of the present embodiment. Even with this configuration, narrowing of the frame can be realized.

As described above, according to the display device 110 of the present embodiment, in addition to the effects of the first embodiment, the following effects can be obtained.
According to the display device 110, the left and right sides of the frame region F are folded back to the back side in a state where the back surface of the display region V of the display panel 28 is fixed using the support substrate 58 as a core material, and the folded portion is the support substrate 58. By sticking to the back surface of the frame, it is possible to realize a narrower frame and a thinner thickness.
Accordingly, it is possible to provide the display device 110 that realizes a narrow frame. In other words, it is possible to provide the display device 110 that realizes a narrow frame using flexibility.

Furthermore, since the display panel 28 employs a configuration in which the display panel 19 is laminated with the laminate structure 25, it is possible to further improve the moisture entry prevention property from the outside. In addition, since the mechanical impact is softened, the handleability can be improved. Furthermore, since bending resistance can be improved, it can be made difficult to break.
In addition, since the left and right length k5 of the frame region F of the display panel 19 is longer than the length k1 of the first embodiment, the barrier layer becomes correspondingly longer and the reliability can be improved.
Further, since the wiring part is selectively formed in the curved area m of the frame area F and the circuit part n is formed in the area excluding the area, damage to the circuit part n due to bending can be prevented. .
Therefore, it is possible to provide the display device 110 that ensures both reliability and a narrow frame.

In addition, since the support substrate 58 is formed using a stainless plate having excellent thermal conductivity, heat generated by the display panel 19 can be efficiently absorbed and radiated to the outside.
Therefore, it is possible to provide the display device 110 with a narrow frame that is excellent in heat dissipation.
Furthermore, since the support substrate 58 is a simple flat plate, it can be efficiently manufactured by press working, and component costs can be suppressed.
Further, the total thickness of the support substrate in the preferred embodiment plus the adhesive layers 60 and 61 is about 1.9 mm, and half of the total thickness (about 0.95 mm) and the bending R inside the element substrate 1 are about. It is substantially the same at 1.0 mm.
Therefore, it is possible to prevent the element substrate 1 from being bent beyond the allowable bending R due to the total thickness. In other words, the frame thickness can be easily reduced within the range of the allowable bending R of the element substrate 1 by matching the total thickness of the support substrate plus the adhesive layers 60 and 61 with the allowable bending R of the element substrate 1. be able to.
The total thickness of the display device 110 in the preferred example is about 2.3 mm, which is thinner than the total thickness (about 3.5 mm) of the display device 100 of the first embodiment.
Therefore, it is possible to provide the display device 110 that achieves both a reduction in thickness and a narrow frame.

In general, the connecting portion between the overhanging region of the display panel 19 and the flexible substrate 20 is reinforced by a molding agent such as a silicone resin (adhesive) covering the connecting portion. there were.
On the other hand, according to the display panel 28, since the reinforcing structure is also used by laminating with the resin films 25a and 25b, the manufacturing efficiency is high. Further, since the connection portion and the display panel 19 are bonded (filled) with the same resin, sufficient practical strength (toughness) can be secured without impairing flexibility.
Furthermore, since the polyethylene-based adhesive layer used for the resin films 25a and 25b is excellent in insulation, water resistance, and heat resistance, sufficient electrical reliability can be ensured.

(Electronic equipment 1)
FIG. 9 is a perspective view showing a mobile phone equipped with the display device.
The display device 100 according to the first embodiment described above can be used by being mounted on, for example, a mobile phone 200 as an electronic device.
The mobile phone 200 includes a main body portion 350 and a display portion 370 provided to be openable and closable with respect to the main body portion and incorporates the display device 100. Specifically, the display device 100 is incorporated in the display unit 370, and the display panel 18 is a display screen.
The main body unit 350 is provided with an operation unit 365 having a plurality of operation buttons.
The design of the mobile phone 200 is such that the distance (frame) from the display region V to the side surface of the display unit 370 is cut away in order to make the display unit 370 look slim. For this reason, the display device 100 capable of handling a narrow frame is employed, and a narrow frame is realized.
Note that the display device 110 may be used instead of the display device 100. Even with this configuration, narrowing of the frame can be realized.

Further, the mode of the mobile phone is not limited to the folding type shown in FIG. 9, and any mobile phone provided with a display panel may be used.
For example, the display unit 370 may be a mobile phone that can be folded and turned with respect to the main body 350. Alternatively, the mobile phone may be an integrated mobile phone or a sliding mobile phone in which an operation unit is housed in an integrated main body.
Also, the electronic device is not limited to a mobile phone, and any electronic device provided with a display panel may be used.
For example, it can be used in various electronic devices such as a display device for a car navigation system, PDA (Personal Digital Assistants), a mobile computer, a digital camera, a digital video camera, an in-vehicle device, and an audio device.

(Electronic equipment 2)
FIG. 10 is a plan view showing an on-vehicle meter equipped with the display device.
The display device 110 according to the second embodiment described above can be used by being mounted on, for example, an in-vehicle meter 210 for an automobile as an electronic device.
The in-vehicle meter 210 includes three display devices 110 arranged side by side. Specifically, the display device 111, the display device 112, and the display device 113 are arranged in this order from the left. Note that the outline of the display device is indicated by a dotted line.
The display device 112 located in the middle has a panel size that is slightly larger than the left and right display devices 111 and 113. With these three display devices, one on-vehicle meter exposed from the opening 212 of the dashboard is displayed. It is composed. In other words, one in-vehicle meter exposed from a horizontally long and elliptical opening 212 having a base cut in a straight line is configured by tiling three display devices 111, 112, and 113 in the horizontal direction. Yes.

For example, a fuel gauge, a water temperature gauge, and the like are displayed on the left display device 111.
For example, a speedometer, a direction indicator, and the like are displayed on the central display device 112.
For example, a tachometer or the like is displayed on the right display device 113. Although FIG. 10 shows a state in which analog display is performed, digital display can be performed by operating a switch (not shown).
Here, the composite display by the three display devices is required to be close and seamless. For this reason, the display device 110 capable of handling a narrow frame is employed, and a narrow frame is realized.

In the center display device 112, the left and right frame regions are narrowed. However, in the left and right display devices 111 and 113, only one side is subjected to the narrowing frame processing. Specifically, in the left display device 111, only the right frame region facing the display device 112 is narrowed, and the left frame region has the same length as the upper and lower frame regions without being folded. Yes. Similarly, in the right display device 113, only the left frame region facing the display device 112 is narrowed.
In this way, only a necessary part (side) may be narrowed according to the required specification, and this reduces wasteful processing, thereby improving manufacturing efficiency and reducing costs.
Note that the display device 100 may be used instead of the display device 110. Moreover, you may use combining these. Even with this configuration, narrowing of the frame can be realized.

  Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below.

(Modification 1)
FIG. 11 is a side sectional view of a display panel according to the first modification, and corresponds to FIG.
In each of the above embodiments, the display panel has been described as a configuration using two glass substrates. However, the present invention is not limited to this, and any configuration may be used as long as at least one glass substrate is used. In addition, about the component same as Embodiment 1, the same number is attached | subjected and the overlapping description is abbreviate | omitted.
The display panel 118 of Modification 1 is a bottom emission type organic EL display panel having a configuration in which an organic EL layer and a barrier layer are stacked on an element substrate 1 made of glass. For this reason, compared with the display panel 18 of FIG. 3, the stacking order (top and bottom) is reversed, and the element substrate 1 is located on the top (Z-axis (−) side). Further, the element substrate 1 serves as a display surface, and display light is emitted from the element substrate 1 side as indicated by a white arrow.

The display panel 118 includes an element substrate 1, an element layer 2, a planarization layer 4, a pixel electrode 6, a partition wall 7, an organic EL layer 8 as an electro-optic layer, a common electrode 9, an electrode protection layer 10, a buffer layer 11, and a gas barrier layer. 12 or the like. The material and configuration of each part are the same as described in the first embodiment.
Moreover, in this modification, as a suitable example, the organic EL layers 8r, 8g, and 8b of each color of red, green, and blue are formed by a three-color painting method using an ink-jet method using a polymer material. For example, in the blue organic EL layer 8b, PEDOT / PSS is used as the hole injection layer, TFB is used as the hole transport layer, and a polyfluorene derivative is used as the light emitting layer. In the red and green organic EL layers 8r and 8g, polymer materials that emit red or green are used.

When this display panel 118 is applied to each of the above embodiments, the gas barrier layer 12 side faces the support frame 50 or the support substrate 58, so that the support frame and the support substrate have the function of the counter substrate. The adhesive layer 60 is preferably adhered to the entire surface for adhesion.
Even when the display panel 118 is applied to each of the above-described embodiments, it can be bent in the same manner, so that the same effects as those of the above-described embodiments can be obtained. In addition, since the support frame and the support substrate can have the function of the counter substrate, the same reliability as in each of the above embodiments can be ensured.

Further, a display panel having a configuration based on a so-called three-color coating method in which a color filter is deleted from the configuration of the display panel of each of the above embodiments and a light emitting layer of each RGB color is formed for each RGB color pixel may be used. .
Further, the display panel of each of the above embodiments has been described as an active matrix type, but may be a passive (simple) matrix type.
In this case, the element layer 2 becomes unnecessary, and the organic EL layer 8 is sandwiched between the scan electrode and the data electrode. For example, the scan electrode is formed on the element substrate 1 side, and the data electrode is formed on the counter substrate 16 side. The scan electrodes and the data electrodes are formed so as to extend in the intersecting directions so as to have a lattice shape in plan view.
Even if it is these structures, the effect similar to said each embodiment can be acquired.

(Modification 2)
This will be described with reference to FIG.
In each of the above embodiments, the display area V has been described as being formed on a flat surface, but the display area V may be bent B. In other words, the display area V may include a bent portion.
According to this configuration, since the end portion of the frame region F includes the curved surface portion of the bending R in FIG. 1C, the length k2 of the frame region F is shortened accordingly, and the frame is narrower. be able to. Further, the present invention can also be applied to the configuration of FIG. 6C, and similarly, a narrow frame can be achieved.
Further, in the portion of the display area V that covers the curved surface portion of the bend R, for example, the planar display mode can be made uniform by increasing the display luminance of the pixels as compared with the planar portion. In other words, it is possible to make the display image uniform by making the display driving condition in the display region V portion applied to the curved surface portion of the bending R different from that of the plane portion. Further, in the curved surface portion of the bend R, gradation may be applied as the distance from the portion close to the display region V (planar portion) increases, and display driving may be performed so as to gradually increase the display luminance of the pixels.
That is, the frame can be narrowed if it is bent or folded from the vicinity of the peripheral edge of the display region V.

(Modification 3)
FIG. 12 is a cross-sectional view of a display panel according to Modification Example 3, and corresponds to FIG.
In each of the above embodiments, the display panel has been described as an organic EL panel, but the present invention is not limited to this, and any structure may be used as long as at least one glass substrate is used. A thin display panel provided with an electro-optic layer may be used. For example, an electrophoretic panel including an electrophoretic layer may be used as the electro-optical layer.
Hereinafter, the display panel 128 according to Modification 3 will be described. In addition, about the component same as FIG. 3, the same number is attached | subjected and the overlapping description is abbreviate | omitted.
The display panel 128 of the present embodiment is a reflective electrophoretic panel provided with an electrophoretic layer 97 as an electro-optical layer.

The display panel 128 has a configuration in which an electrophoretic layer 97 is sandwiched between the element substrate 1 and the counter substrate 95. Further, the laminated structure from the element substrate 1 to the pixel electrode 6 is the same as the configuration of FIG.
The counter substrate 95 is a transparent substrate made of, for example, glass or plastic. On the element substrate 1 side of the counter substrate 95, a counter electrode 94 is formed on the entire surface (solid shape) so as to face the plurality of pixel electrodes 6. The counter electrode 94 is made of a transparent conductive material such as ITO.
The electrophoretic layer 97 includes a plurality of microcapsules 90, a binder 92 that holds the microcapsules, an adhesive layer 91, and the like. Note that the display panel 128 includes an electrophoretic sheet in which the electrophoretic layer 97 is fixed to the counter substrate 95 in advance with a binder 92, and the element substrate 1 on which the pixel electrode 6 and the like are formed separately from the sheet. Is formed by bonding with an adhesive layer 91.

One or a plurality of microcapsules 90 are sandwiched between the pixel electrode 6 and the counter electrode 94 and are arranged in one pixel (in other words, with respect to one pixel electrode 6).
As shown in the enlarged view in the upper right of FIG. 12, the microcapsule 90 has a configuration in which a dispersion medium 78, a plurality of white particles 76, and a plurality of black particles 77 are enclosed inside a coating 75. The microcapsule 90 is formed in a spherical shape having a particle size of about 50 μm, for example.
The coating 75 is made of a polymer resin having translucency such as acrylic resin, urea resin, gum arabic, and gelatin.
The dispersion medium 78 is a medium for dispersing the white particles 76 and the black particles 77 in the microcapsules 90 (in other words, in the coating film 75).

The white particles 76 are particles (polymer or colloid) made of a white pigment such as titanium dioxide, zinc white (zinc oxide), and antimony trioxide, and are negatively charged, for example.
The black particles 77 are particles (polymer or colloid) made of a black pigment such as aniline black or carbon black, and are positively charged, for example.
As a result, the white particles 76 and the black particles 77 move in the dispersion medium 78 due to the electric field (potential difference) generated by the potential difference between the pixel electrode 6 and the counter electrode 94, so that the particles gathered on the counter electrode 94 side. The color tone will be displayed.
It should be noted that color display such as red, green, and blue can be performed by replacing the pigment used for the white particles 76 and the black particles 77 with pigments such as red, green, and blue.
In addition, the present invention is not limited to the above-described microcapsule method, and an electropowder fluid type electrophoretic panel that controls display switching / on / off by switching between plus and minus by putting a charged electropowder fluid in a pixel. It may be. Alternatively, an electrophoretic panel using cholesteric liquid crystal may be used.
Even if it is these structures, the effect similar to said each embodiment can be acquired.

  DESCRIPTION OF SYMBOLS 1 ... Element board | substrate as a glass substrate, 8 ... Organic EL layer as an electro-optic layer, 16 ... Opposite substrate as a glass substrate, 18, 19 ... Display panel, 20 ... Flexible substrate, 25 ... Laminate structure, 25a, 25b DESCRIPTION OF SYMBOLS ... Resin film, 50 ... Support frame, 52 ... Storage part, 54 ... Gap part, 55 ... Side wall, 58 ... Support substrate, 100, 110 ... Display apparatus as an electro-optical device, 200 ... Mobile phone as electronic equipment, 210 ... an on-vehicle meter as an electronic device, F ... a frame area, V ... a display area.

Claims (13)

A display panel formed by forming an electro-optic layer on which a plurality of pixels are formed on a glass substrate having a thickness of 50 μm or less;
A support frame for supporting the display panel,
In the support frame, a support unit that supports at least a part of the display region in which the plurality of pixels are formed, a storage unit that stores at least one side of a frame region formed outside the display region, Is formed,
The electro-optical device, wherein the one side is bent from the vicinity of the peripheral edge of the display area toward the support frame, and at least a part of the frame area is held in contact with a side wall of the storage part.   The electro-optical device according to claim 1, wherein the side wall is formed integrally with the support frame, and is formed in a direction intersecting with a surface including the display area. In a side view, an angle formed by the surface including the display area and the bent portion with respect to the bent side is provided within a range of 90 to 120 degrees,
The electro-optical device according to claim 1, wherein a bending radius of the glass substrate in the bent portion is 1.8 mm or less. A display panel formed by forming an electro-optic layer on which a plurality of pixels are formed on a glass substrate having a thickness of 50 μm or less;
A support substrate that supports the display panel from the glass substrate side,
When the surface on the display panel side of the support substrate is the front surface, and the surface opposite to the front surface is the back surface,
At least one side of a frame region formed outside the display region in which the plurality of pixels are formed in the display panel is folded back from the vicinity of the peripheral portion of the display region to the back side of the support substrate. An electro-optical device. A first adhesive layer for adhering and supporting the display panel is provided on the front surface of the support substrate, and a second adhesive layer for adhering the folded one side to the back surface. Is provided,
The bending radius of the glass substrate in the folded portion is substantially the same radius as the half of the thickness of the support substrate plus the thickness of the first adhesive layer and the second adhesive layer. The electro-optical device according to claim 4. When the glass substrate is the first substrate,
The display panel further includes a second substrate made of a glass substrate having substantially the same thickness as the first substrate, and the electro-optic layer is sandwiched between the first substrate and the second substrate. The electro-optical device according to claim 1, wherein   The electro-optical device according to claim 6, further comprising a resin film that covers and laminates the display panel from the first substrate side and the second substrate side. In the frame area of the display panel, a pixel circuit including a drive circuit for driving the plurality of pixels is formed,
8. The wiring portion for connecting the pixel and the pixel circuit is formed in the bent portion or the bent and bent portion. The electro-optical device according to one item.   9. The electro-optical device according to claim 1, wherein a length of the frame region that is bent or folded back is secured to 2 mm or more.   The electro-optical device according to claim 1, wherein the bent portion or the folded portion is formed on two opposing sides in the frame region.   The electro-optical device according to claim 1, wherein the electro-optical layer is an organic EL layer including an organic light emitting layer.   An electronic apparatus comprising the electro-optical device according to claim 1 as a display unit. A plurality of electro-optical devices according to any one of claims 1 to 11,
An electronic apparatus comprising: a display unit in which the plurality of electro-optical devices are tiled so that the folded portions or the folded portions are adjacent to each other.

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