JP5062990B2 - Display device - Google Patents

Description

The present invention relates to a display device including a self-luminous light emitting element. In addition, the present invention relates to an electronic device using a display device including a light-emitting element.

In recent years, a display device using a self-luminous element represented by an electroluminescence element or the like has been developed. A display device using a self-luminous element has advantages of high image quality, wide viewing angle, and thinness and light weight because a backlight is unnecessary. In recent years, portable electronic devices, which have been widely used, are required to have high added value by diversifying their purpose of use. Recently, a device with a sub display surface provided behind the normal display surface has been provided. (For example, refer to Patent Document 1).
JP 2001-285445 A

In many cases, a display device using a self-luminous element has a total of two substrates: an element substrate provided with a pixel portion including a light emitting element and a sealing substrate provided opposite to the element substrate. . Therefore, an electronic apparatus having a sub display surface on the back side of a normal display surface has two sets each including an element substrate and a sealing substrate, and has a total of four substrates.

Electronic devices with a sub display surface in addition to the main display surface are significantly smaller, thinner and lighter, and the volume occupied by a backlight or a printed circuit board mounted with multiple IC chips cannot be ignored. It has become. Therefore, in an electronic device having display surfaces on the front and back sides, there is a trade-off relationship between downsizing, thinning, lightening, and high added value. Therefore, in view of the above situation, the present invention provides a display device and an electronic device that achieve high added value by providing display surfaces on the front and back sides, and that are reduced in size, thickness, and weight. And

The display device of the present invention uses a plurality of element substrates provided with a pixel portion including a light-emitting element, and one element substrate among the plurality of element substrates is a sealing substrate of another element substrate. It is also characterized by serving. Rather than providing a sealing substrate corresponding to each of a plurality of element substrates, one element substrate also serves as a sealing substrate for another element substrate, thereby reducing the size, thickness and weight. Realize.

The display device of the present invention includes at least two element substrates provided with light-emitting elements, and the two element substrates provided with light-emitting elements are arranged so as to face each other. The display surfaces are provided on the front and back sides. With the above characteristics, high added value can be realized. The display device of the present invention includes two pixel portions, and the two pixel portions share a controller circuit and a power supply circuit. With the above features, it is possible to achieve downsizing, weight reduction, and price reduction.

The display device of the present invention is characterized in that display surfaces are provided on the front and back sides, and the configuration is roughly divided into three. The first is a case where a substrate provided with a light emitting element that emits a bottom surface and a substrate provided with a light emitting element that emits a top surface are bonded together, and a connection film is provided on each of the two substrates. . The second case is a case where two substrates provided with a light emitting element for performing bottom emission are bonded together, and a connection film is provided on each of the two substrates. The third case is a case where two substrates provided with a light emitting element for performing bottom emission are bonded together, and a connection film is provided on one of the two substrates.

Note that a light-emitting element that emits light from the bottom refers to a light-emitting element that emits light in the direction of the other surface of the element substrate when the light-emitting element is provided on one surface of the element substrate. A light-emitting element that emits light from the top means a light-emitting element that emits light in the direction of a sealing substrate provided to face the element substrate.

A display device of the present invention in which a substrate provided with a light emitting element that performs bottom emission and a substrate provided with a light emitting element that performs top emission has a first substrate, a second substrate, and a third substrate. The first substrate and the second substrate are provided so that one surface of the first substrate and the other surface of the second substrate face each other, and the second substrate and the third substrate are the second substrate The one surface of the substrate and the one surface of the third substrate are provided so as to face each other. A first pixel portion including a first light emitting element is provided on one surface of the first substrate, and a second pixel portion including a second light emitting element is provided on one surface of the second substrate. It is done. The first light emitting element emits light in the direction of the other surface of the first substrate, and the second light emitting element emits light in the direction of the other surface of the third substrate. In addition, a first display surface using the first pixel portion is provided on the other surface of the first substrate (the other surface side of the first substrate), and the other surface (third surface) of the third substrate. A second display surface using the second pixel portion is provided on the other surface side of the substrate. Moreover, the display device of the present invention having the above-described configuration includes a first connection film provided on one surface of the first substrate and a second connection provided on one surface of the second substrate. Have a film. The first connection film is connected to the first pixel portion, and the second connection film is connected to the second pixel portion.

A display device of the present invention in which two substrates each provided with a light-emitting element that performs bottom emission are bonded to each other includes a first substrate and a second substrate. The first substrate and the second substrate are provided so that one surface of the first substrate faces one surface of the second substrate, and the first substrate and the second substrate are arranged on the first surface of the first substrate. The first pixel portion including the light emitting element is provided, and the second pixel portion including the second light emitting element is provided on one surface of the second substrate. The first light emitting element emits light in the direction of the other surface of the first substrate, and the second light emitting element emits light in the direction of the other surface of the second substrate. A first display surface using the first pixel portion is provided on the other surface of the first substrate (the other surface side of the first substrate), and the other surface of the second substrate (second surface). A second display surface using the second pixel portion is provided on the other surface side of the substrate. Moreover, the display device of the present invention having the above-described configuration includes a first connection film provided on one surface of the first substrate and a second connection provided on one surface of the second substrate. Have a film. The first connection film is connected to the first pixel portion, and the second connection film is connected to the second pixel portion. In the display device of the present invention having the above structure, each of the first light-emitting element and the second light-emitting element includes a pair of conductive layers and an electroluminescent layer sandwiched between the pair of conductive layers. One of the pair of conductive layers included in one light-emitting element is shared with one of the pair of conductive layers included in the second light-emitting element.

A display device of the present invention in which two substrates each provided with a light-emitting element that performs bottom emission are bonded to each other includes a first substrate and a second substrate. The first substrate and the second substrate are provided so that one surface of the first substrate faces one surface of the second substrate, and the first substrate and the second substrate are arranged on the first surface of the first substrate. The first pixel portion including the first light emitting element and the first connection conductive layer are provided, and the second pixel portion including the second light emitting element and the second connection conductive layer are provided on one surface of the second substrate. A conductive layer is provided. The first light emitting element emits light in the direction of the other surface of the first substrate, and the second light emitting element emits light in the direction of the other surface of the second substrate. A first display surface using the first pixel portion is provided on the other surface of the first substrate (the other surface side of the first substrate), and the other surface (second surface) of the second substrate. A second display surface using the second pixel portion is provided on the other surface side of the substrate. The first connection conductive layer and the second connection conductive layer are electrically connected by a conductive spacer. The display device of the present invention having the above configuration has a connection film provided on one surface of the first substrate. The connection film is connected to the first pixel portion and the second pixel portion. The connection film corresponds to an FPC (Flexible Print Circuit) or a film-like printed circuit on which an LSI (Large Scale Inter- lation) chip is placed.

One of the first display surface and the second display surface is a main display surface, and the other is a sub display surface. One of the first display surface and the second display surface is a display surface that displays an image, and the other is a display surface that displays only character information.

In addition, the driving circuit includes one or both of a first driving circuit that drives the first pixel portion and a second driving circuit that drives the second pixel portion, and the first driving circuit is one of the first substrates. The second drive circuit is provided on one surface of the second substrate.

In addition, the first pixel portion includes a transistor that controls light emission of the first light-emitting element. The second pixel portion includes a transistor that controls light emission of the second light-emitting element.

In addition, the display device of the present invention includes a controller circuit that supplies a control signal to the first pixel portion and the second pixel portion. In addition, the display device of the present invention includes a power supply circuit that supplies a power supply potential to the first pixel portion and the second pixel portion. The display device of the present invention includes a switching circuit and a controller circuit that supplies a control signal to the first pixel portion or the second pixel portion based on a signal output from the switching circuit. The display device of the present invention includes a switching circuit and a power supply circuit that supplies a power supply potential to the first pixel portion or the second pixel portion based on a signal output from the switching circuit. Since the display device of the present invention shares the controller circuit and the power supply circuit with the pixel portions provided on each of the front and back sides, the number of IC chips can be reduced, and the size, thickness, weight, and cost can be reduced. Can be realized.

In addition, the display device of the present invention includes a controller circuit that supplies a control signal to the first pixel portion and the second pixel portion, and the controller circuit is provided on one surface of the first substrate or on the first surface. It is provided on one surface of the two substrates. In addition, the display device of the present invention includes a power supply circuit that supplies a power supply potential to the first pixel portion and the second pixel portion, and the power supply circuit is provided on one surface of the first substrate or on the first surface. It is provided on one surface of the two substrates. In addition, the display device of the present invention includes a switching circuit and a controller circuit that supplies a control signal to the first pixel portion or the second pixel portion based on a signal output from the switching circuit. And a controller circuit are provided on one surface of the first substrate or one surface of the second substrate. The display device of the present invention includes a switching circuit, and a power supply circuit that supplies a power supply potential to the first pixel portion or the second pixel portion based on a signal output from the switching circuit. Are provided on one surface of the first substrate or on one surface of the second substrate.

The present invention also provides an electronic device using the display device having the above-described configuration, and provides, for example, a portable terminal, a portable information terminal, a digital camera, and a digital video camera.

Further, the present invention uses a plurality of element substrates provided with a pixel portion including a light emitting element, but the area of the pixel portion of one element substrate and the area of the pixel portion of another element substrate are , Different from each other. Therefore, the present invention is characterized in that the area of the display surface using the pixel portion of one element substrate is different from the area of the display surface using the pixel portion of another element substrate. As described above, at least two element substrates have different display surface areas, while one element substrate also serves as a sealing substrate for another element substrate. The area of one element substrate and the area of another element substrate are the same. Therefore, the present invention is characterized by providing not only a pixel portion including a light emitting element but also a functional circuit portion including a plurality of transistors on the element substrate in order to effectively use an element substrate having a small area of the pixel portion. To do. The functional circuit unit is a central processing circuit (CPU, Central Processing Unit), a memory circuit, a buffer circuit, an interface circuit, a timing signal generation circuit, a format conversion circuit, a frame memory circuit, an image processing circuit, an audio processing circuit, a transmission / reception circuit, a correction It includes a plurality of transistors constituting one or more selected from a circuit, a time detection circuit, a temperature detection circuit, an illuminance detection circuit, a register circuit, a decoder circuit, a frequency divider circuit, a digital signal processing dedicated processor circuit, or the like. By providing the functional circuit portion, the number of IC chips provided outside can be reduced, so that the size, thickness, and weight can be reduced.

A display device of the present invention in which a substrate provided with a light emitting element that emits bottom emission and a substrate provided with a light emitting element that emits top emission is bonded has a first substrate, a second substrate, and a third substrate. The first substrate and the second substrate are provided such that one surface of the first substrate and the other surface of the second substrate face each other, and the second substrate and the third substrate are the second substrate The one surface of the substrate and the one surface of the third substrate are provided to face each other. A first pixel portion including a first light emitting element is provided on one surface of the first substrate, and a second pixel portion including a second light emitting element is provided on one surface of the second substrate. It is done. The first light emitting element emits light in the direction of the other surface of the first substrate, and the second light emitting element emits light in the direction of the other surface of the third substrate. Accordingly, the first display surface using the first pixel portion is provided on the other surface of the first substrate, and the second display surface using the second pixel portion on the other surface of the third substrate. And a functional circuit portion including a plurality of transistors is provided on one surface of the first substrate or one surface of the second substrate, and the area of the first display surface and the second display surface The areas are different from each other.

A display device of the present invention in which two substrates each provided with a light-emitting element that performs bottom emission are bonded to each other includes a first substrate and a second substrate, and the first substrate and the second substrate are the first substrate and the second substrate. A first pixel portion including a first light emitting element is provided on one surface of the first substrate, the first surface of the first substrate and the one surface of the second substrate facing each other; A second pixel portion including a second light emitting element is provided on one surface of the second substrate, the first light emitting element emits light in the direction of the other surface of the first substrate, and second light emission The element emits light in the direction of the other surface of the second substrate, the first display surface using the first pixel portion is provided on the other surface of the first substrate, and the other surface of the second substrate. A second display surface using the second pixel portion is provided, and a functional circuit portion including a plurality of transistors is provided on one surface of the first substrate or one surface of the second substrate. Area as a second display surface of the first display surface are different from each other.

A display device of the present invention in which two substrates each provided with a light-emitting element that performs bottom emission are bonded to each other includes a first substrate and a second substrate, and the first substrate and the second substrate are the first substrate and the second substrate. The first pixel portion including the first light-emitting element on the first surface of the first substrate and the first pixel portion are provided so that one surface of the first substrate faces one surface of the second substrate. A connection conductive layer is provided, a second pixel portion including the second light emitting element and a second connection conductive layer are provided on one surface of the second substrate, and the first light emitting element is the first light emitting element. The second light emitting element emits light in the direction of the other surface of the second substrate, and the first pixel portion is used on the other surface of the first substrate. 1 is provided, and the second display surface using the second pixel portion is provided on the other surface of the second substrate. The first connection conductive layer and the second connection conductive layer are , Conductive space A functional circuit portion including a plurality of transistors is provided on one surface of the first substrate or one surface of the second substrate, and is electrically connected by a material. The areas of the display surfaces are different from each other.

In the display device of the present invention having the above-described configuration, a first connection film provided on one surface of the first substrate and a second connection film provided on one surface of the second substrate are provided. And the first connection film is connected to the first pixel portion, the second connection film is connected to the second pixel portion, and the first connection film or the second connection film is connected to the functional circuit portion. To do.

The display device of the present invention having the above structure includes a connection film provided on one surface of the first substrate, and the connection film is provided on the first pixel portion, the second pixel portion, and the functional circuit portion. Connecting.

The display device of the present invention includes a functional circuit unit, and the plurality of transistors included in the functional circuit unit includes a memory circuit, a central processing circuit, a buffer circuit, an interface circuit, a timing signal generation circuit, a format conversion circuit, a frame memory circuit, An image processing circuit, an audio processing circuit, a transmission / reception circuit, a correction circuit, a time detection circuit, a temperature detection circuit, an illuminance detection circuit, a register circuit, a decoder circuit, a frequency divider circuit, or a processor circuit dedicated to digital signal processing is configured.

In the display device of the present invention having the above structure, the first pixel portion includes a transistor that controls light emission of the first light-emitting element. The second pixel portion includes a transistor that controls light emission of the second light-emitting element. In addition, a controller circuit that supplies a control signal to the first pixel portion and the second pixel portion is provided. In addition, the switching circuit includes a controller circuit that supplies a control signal to the first pixel portion or the second pixel portion based on a signal output from the switching circuit. In addition, a power supply circuit that supplies a power supply potential to the first pixel portion and the second pixel portion is provided. In addition, a switching circuit and a power supply circuit that supplies a power supply potential to the first pixel portion or the second pixel portion based on a signal output from the switching circuit are provided. In addition, the electronic device of the present invention uses a display device having any one of the above-described configurations.

The display device of the present invention includes a plurality of substrates, at least one of which has a light-transmitting property.

The display device of the present invention uses a plurality of element substrates provided with a pixel portion including a light-emitting element, and one element substrate among the plurality of element substrates is a sealing substrate of another element substrate. It is also characterized by serving. Rather than providing a sealing substrate corresponding to each of a plurality of element substrates, one element substrate also serves as a sealing substrate for another element substrate, thereby reducing the size, thickness and weight. Realize.

That is, the present invention is characterized in that at least one element substrate of the plurality of element substrates also serves as a sealing substrate for another element substrate. The present invention does not provide a sealing substrate corresponding to each of a plurality of element substrates, but at least one element substrate of the plurality of element substrates is sealed with another element substrate. Since it also serves as a substrate, the total number of substrates can be reduced. Therefore, a reduction in size, thickness and weight can be realized.

In addition, the display device of the present invention includes at least two element substrates provided with light emitting elements, and the element substrates provided with the light emitting elements are arranged so as to face each other. Is provided on both sides. With the above characteristics, high added value can be realized. The display device of the present invention includes two pixel portions, and the two pixel portions share a controller circuit and a power supply circuit. With the above features, it is possible to achieve downsizing, weight reduction, and price reduction.

Embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the following description, and it is easily understood by those skilled in the art that modes and details can be variously changed without departing from the spirit and scope of the present invention. Therefore, the present invention should not be construed as being limited to the description of the embodiments below. Note that in the structures of the present invention described below, the same reference numerals are used in common in different drawings.
(Embodiment 1)

The display device of the present invention is characterized in that display surfaces are provided on the front and back sides, and the configuration is roughly divided into three. The first is a case where a substrate provided with a light emitting element for emitting bottom surface and a substrate provided with a light emitting element for emitting top surface are bonded together, and a connection film is provided on each of the two substrates (see FIG. 1). The second case is a case where two substrates provided with a light emitting element for performing bottom emission are bonded together, and a case where a connection film is provided on each of the two substrates (see FIG. 4). The third case is a case where two substrates provided with a light emitting element for performing bottom emission are bonded together, and a case where a connection film is provided on one of the two substrates (see FIG. 8).

First, a case where a substrate provided with a light emitting element for performing bottom emission and a substrate provided with a light emitting element for performing top emission are bonded together and a connection film is provided on each of the two substrates will be described (FIG. 1). The display device of the present invention includes a first substrate 11, a second substrate 12, and a third substrate 13. The first substrate 11 and the second substrate 12 are provided so that one surface of the first substrate 11 and the other surface of the second substrate 12 face each other. The second substrate 12 and the third substrate 13 are provided so that one surface of the second substrate 12 and one surface of the third substrate 13 face each other. The first substrate 11 and the second substrate 12, and the second substrate 12 and the third substrate 13 are bonded to each other with a sealing material 16.

A first pixel portion 14 including a first light emitting element is provided on one surface of the first substrate 11. The first light emitting element included in the first pixel portion 14 emits light in the direction of the other surface of the first substrate 11. A second pixel portion 15 including a second light emitting element is provided on one surface of the second substrate 12. The second light emitting element included in the second pixel portion 15 emits light in the direction of the other surface of the third substrate 13. That is, the first light emitting element included in the first pixel portion 14 performs bottom emission, and the second light emitting element included in the second pixel portion 15 performs top emission. Accordingly, a first display surface using the first pixel portion is provided on the other surface of the first substrate 11, and the second pixel portion is used for the other surface of the third substrate 13. A second display surface is provided.

The display device of the present invention uses a plurality of substrates provided with a pixel portion including a light-emitting element, and one substrate also serves as a sealing substrate for another substrate. Therefore, a reduction in size, thickness, and weight can be realized. In addition, since at least two substrates provided with a pixel portion including a light-emitting element are provided so as to face each other, display surfaces using the pixel portion are provided on the front and back sides, and high added value can be realized. it can.

On one surface of the first substrate 11, a first connection film 17, an anisotropic conductive layer 93, and a connection conductive layer 91 are provided. The first connection film 17 is connected to the first pixel portion 14 via the anisotropic conductive layer 93 and the connection conductive layer 91. A second connection film 18, an anisotropic conductive layer 94, and a connection conductive layer 92 are provided on one surface of the second substrate 12. The second connection film 18 is connected to the second pixel portion 15 via the anisotropic conductive layer 94 and the connection conductive layer 92.

The first connection film 17 and the second connection film 18 are provided so as not to overlap each other. When the first substrate 11, the second substrate 12, and the third substrate 13 are stacked, the connection conductive layer 91 and the anisotropic conductive layer 93 are laminated, and the connection conductive layer 92 is anisotropic. The laminated body of the conductive conductive layers 94 is provided so as not to overlap each other.

1B, FIG. 1C, FIG. 2, and FIG. 3 correspond to cross-sectional views from point A to point B in the perspective view of FIG. In the cross-sectional views (FIGS. 1B and 1C), both the first connection film 17 and the second connection film 18 are illustrated for easy understanding.

Both the first connection film 17 and the second connection film 18 are connected to the printed circuit board 19. A plurality of IC chips 20 are provided on the printed circuit board 19. Each of the plurality of IC chips 20 corresponds to one or a plurality selected from a controller circuit, a power supply circuit, a central processing circuit (CPU), and the like. The IC chip 20 supplies a signal and a power supply potential to the first pixel portion 14 and the second pixel portion 15 via the first connection film 17 and the second connection film 18.

Further, an inert gas 71 is filled between one surface of the first substrate 11 and the other surface of the second substrate 12, so that one surface of the second substrate 12 and the third substrate are filled. An inert gas 72 is filled between the one surface 13 (see FIG. 1B). Inert gases 71 and 72 refer to, for example, a rare gas or a nitrogen gas.

In addition, as what is filled between the substrates, a sealing resin layer 73 is provided between one surface of the first substrate 11 and the other surface of the second substrate 12 instead of an inert gas, so that the second A sealing resin layer 74 may be provided between one surface of the substrate 12 and one surface of the third substrate 13 (see FIG. 1C). For the sealing resin layers 73 and 74, a thermosetting resin material or an ultraviolet light curable resin material may be used. When the sealing resin layers 73 and 74 are provided, the thickness between the substrates is kept constant. A spacer may be provided together with the sealing resin layers 73 and 74. In addition, a layer containing a material having a high barrier property such as a metal oxide or a nitride oxide (hereinafter sometimes abbreviated as a barrier layer) may be provided so as to cover the light-emitting element. As described above, as a method for preventing the deterioration of the light-emitting element, any one of a method of filling an inert gas, a method of providing a sealing resin layer, and a method of providing a barrier layer may be used, or a plurality of combinations may be used. May be used.

Moreover, although the 1st board | substrate 11 and the 2nd board | substrate 12, the 2nd board | substrate 12 and the 3rd board | substrate 13 are bonded together by the sealing material 16, in order to raise the intensity | strength of bonding of board | substrates further, A sealing material 76 may be further provided at the end portions of the first substrate 11, the second substrate 12, and the third substrate 13 (see FIG. 1C).

Further, an IC chip may be provided on one surface of the first substrate 11 and one surface of the second substrate 12 by a COG method. The IC chip functions as a drive circuit that controls the operations of the first pixel portion 14 and the second pixel portion 15. Note that the IC chip has a thickness of about 30 μm even if it is thinned, while the thickness between the two substrates is about 10 μm. Therefore, when an IC chip is provided on one surface of the first substrate 11, the thickness between the first substrate 11 and the second substrate 12 may be intentionally increased.

Next, a cross-sectional structure of the display device having the above structure (see FIGS. 1A to 1C) will be described with reference to the drawings. The first pixel portion 14 and the second pixel portion 15 are either an active matrix type in which each pixel is provided with a light emitting element and a transistor, or a passive matrix type in which each pixel is provided with only a light emitting element. Is done. There are four combinations. First, when both the first pixel portion 14 and the second pixel portion 15 are active matrix type, the second is the first pixel portion 14 is active matrix type. When the second pixel portion 15 is a passive matrix type, the third is the first pixel portion 14 is a passive matrix type, and when the second pixel portion 15 is an active matrix type, the fourth is the first This is a case where both the pixel portion 14 and the second pixel portion 15 are of a passive matrix type. Hereinafter, when both the first pixel portion 14 and the second pixel portion 15 are of an active matrix type (see FIG. 2), the first pixel portion 14 is of a passive matrix type, and the second pixel portion 15 A cross-sectional structure in the case of the active matrix type (see FIG. 3) will be described.

In FIGS. 1B and 1C and FIGS. 2 and 3, the same reference numerals are used in common in different drawings, and the following description of portions using the same reference numerals is used. Is omitted.

First, a cross-sectional structure in the case where both the first pixel portion 14 and the second pixel portion 15 are active matrix types will be described (see FIG. 2). On one surface of the first substrate 11, the first pixel portion 14 and the drive circuit 35 are provided. The first pixel portion 14 includes a first light emitting element 31, a driving transistor 33, and a capacitor element 34. The drive circuit 35 has an N-type (N-channel type) transistor and a P-type (P-channel type) transistor connected in series. The first light emitting element 31 has a structure in which an electroluminescent layer is sandwiched between a pair of conductive layers. One of the pair of conductive layers of the first light emitting element 31 is connected to a conductive layer functioning as a source wiring or a drain wiring of the driving transistor 33. An inert gas 71 is filled between the first substrate 11 and the second substrate 12.

On one surface of the second substrate 12, the second pixel portion 15 and the drive circuit 38 are provided. The second pixel portion 15 includes a second light emitting element 32, a driving transistor 36, and a capacitor element 37. The drive circuit 38 has an N-type transistor and a P-type transistor connected in series. The second light emitting element 32 has a structure in which an electroluminescent layer is sandwiched between a pair of conductive layers. One of the pair of conductive layers of the second light emitting element 32 is connected to a conductive layer functioning as a source wiring or a drain wiring of the driving transistor 36. An inert gas 72 is filled between the second substrate 12 and the third substrate 13. The drive circuits 35 and 38 correspond to functional circuits such as a source driver, a gate driver, a central processing circuit, and an image processing circuit.

In the above configuration, the first light emitting element 31 included in the first pixel portion 14 performs bottom emission, and the second light emitting element 32 included in the second pixel portion 15 performs top emission. Accordingly, a first display surface using the first pixel portion 14 is provided on the other surface of the first substrate 11, and a second pixel portion 15 is provided on the other surface of the third substrate 13. A second display surface using is provided.

Next, a cross-sectional structure in the case where the first pixel portion 14 is a passive matrix type and the second pixel portion 15 is an active matrix type will be described (see FIG. 3). A first pixel portion 14 is provided on one surface of the first substrate 11. The first pixel portion 14 includes a first light emitting element 41. The first light emitting element 41 corresponds to a stacked body of the conductive layer 42, the electroluminescent layer 43, and the conductive layer 44. Insulating layers 45 a and 45 b are provided between adjacent first light emitting elements 41. An inert gas 71 is filled between the first substrate 11 and the second substrate 12.

On one surface of the second substrate 12, the second pixel portion 15 and the drive circuit 38 are provided. The second pixel portion 15 includes a second light emitting element 32, a driving transistor 36, and a capacitor element 37. The drive circuit 38 has an N-type transistor and a P-type transistor connected in series. An inert gas 72 is filled between the second substrate 12 and the third substrate 13.

In the above configuration, the first light emitting element 41 included in the first pixel portion 14 performs bottom emission, and the second light emitting element 32 included in the second pixel portion 15 performs top emission. Accordingly, a first display surface using the first pixel portion 14 is provided on the other surface of the first substrate 11, and a second pixel portion 15 is provided on the other surface of the third substrate 13. A second display surface using is provided.

In the above configuration (see FIGS. 2 and 3), the inert gas 71 is filled between the first substrate 11 and the second substrate 12, and the second substrate 12 and the third substrate 13 are not filled. The case where the active gas 72 is filled is shown. However, the present invention is not limited to this form, and a resin may be filled between the substrates, or a barrier layer is provided so as to cover the first light emitting elements 31 and 41 and the second light emitting element 32. Also good.
(Embodiment 2)

Subsequently, a case where two substrates each provided with a light emitting element for emitting bottom surface are bonded together and a connection film is provided on each of the two substrates will be described (FIGS. 1A and 4A). (See (B)). The display device of the present invention includes a first substrate 311 and a second substrate 312. The first substrate 311 and the second substrate 312 are provided so that one surface of the first substrate 311 and one surface of the second substrate 312 face each other. The first substrate 311 and the second substrate 312 are attached to each other with a sealant 316.

A first pixel portion 314 including a first light-emitting element is provided on one surface of the first substrate 311. The first light-emitting element included in the first pixel portion 314 emits light in the direction of the other surface of the first substrate 311. A second pixel portion 315 including a second light emitting element is provided on one surface of the second substrate 312. The second light-emitting element included in the second pixel portion 315 emits light in the direction of the other surface of the second substrate 312. That is, both the first light-emitting element included in the first pixel portion 314 and the second light-emitting element included in the second pixel portion 315 perform bottom emission. Therefore, a first display surface using the first pixel portion 314 is provided on the other surface of the first substrate 311, and a second pixel portion 315 is provided on the other surface of the second substrate 312. A second display surface using is provided.

The display device of the present invention uses a plurality of substrates provided with a pixel portion including a light-emitting element, and one substrate also serves as a sealing substrate for another substrate. Therefore, a reduction in size, thickness, and weight can be realized. In addition, since at least two substrates provided with a pixel portion including a light-emitting element are provided so as to face each other, display surfaces using the pixel portion are provided on the front and back sides, and high added value can be realized. it can.

On one surface of the first substrate 311, a first connection film 317, an anisotropic conductive layer 393, and a connection conductive layer 391 are provided. A second connection film 318, an anisotropic conductive layer 394, and a connection conductive layer 392 are provided on one surface of the second substrate 312. Both the first connection film 317 and the second connection film 318 are connected to the printed circuit board 319. A plurality of IC chips 320 are provided on the printed circuit board 319. Note that a film in which connection terminals are provided on both surfaces (one surface and the other surface) may be used as the second connection film 318. Alternatively, as the second connection film 318, a connector that electrically connects two films provided with connection terminals on one surface and the two films may be used.

Further, an inert gas 370 is filled between one surface of the first substrate 311 and one surface of the second substrate 312 (see FIG. 4A). Instead, a sealing resin layer 375 may be provided (see FIG. 4B). In the case where the sealing resin layer 375 is provided, a spacer 379 may be provided together with the sealing resin layer 375 in order to keep the thickness between the substrates constant. In addition, a barrier layer may be provided so as to cover the light emitting element. In addition, although the first substrate 311 and the second substrate 312 are bonded to each other with the sealant 316, in order to further increase the bonding strength between the substrates, the first substrate 311 and the second substrate 312 A sealing material 376 may be provided at the end of the substrate (see FIG. 4B). In addition, an IC chip may be provided on one surface of the first substrate 311 and one surface of the second substrate 312 by a COG method. The IC chip is used as a driver circuit that controls operations of the first pixel portion 314 and the second pixel portion 315. However, the thickness of the IC chip is about 30 μm even if it is thinned, while the thickness between the first substrate 311 and the second substrate 312 is about 10 μm. Therefore, in the case where the first substrate 311 is provided on one surface and the second substrate 312 is provided on one surface, the thickness between the first substrate 311 and the second substrate 312 may be intentionally increased. .

Next, a detailed cross-sectional structure of the display device having the above structure (see FIGS. 4A and 4B) will be described with reference to the drawings. For the first pixel portion 314 and the second pixel portion 315, either of an active matrix type or a passive matrix type may be employed. There are four combinations as described above. In the following, when both the first pixel portion 314 and the second pixel portion 315 are active matrix type (see FIG. 5), the first pixel portion 314 is active. A cross section when the second pixel portion 315 is a matrix type and the second pixel portion 315 is a passive matrix type (see FIG. 6), and when both the first pixel portion 314 and the second pixel portion 315 are an active matrix type (see FIG. 7). The structure will be described.

4A and 4B and FIGS. 5 to 7, the same reference numerals are used in common in different drawings, and a description of the portions using the common reference numerals is given below. Is omitted.

First, a cross-sectional structure in the case where both the first pixel portion 314 and the second pixel portion 315 are active matrix types will be described (see FIG. 5). A first pixel portion 314 and a driver circuit 335 are provided on one surface of the first substrate 311. The first pixel portion 314 includes a first light emitting element 331, a driving transistor 333, and a capacitor 334. Drive circuit 335 includes an N-type transistor and a P-type transistor connected in series. A second pixel portion 315 and a driver circuit 338 are provided on one surface of the second substrate 312. The second pixel portion 315 includes a second light emitting element 332, a driving transistor 336, and a capacitor 337. The drive circuit 338 includes an N-type transistor and a P-type transistor connected in series.

In the above structure, the first light-emitting element 331 included in the first pixel portion 314 and the second light-emitting element 332 included in the second pixel portion 315 both perform bottom emission. Therefore, a first display surface using the first pixel portion 314 is provided on the other surface of the first substrate 311, and a second pixel portion 315 is provided on the other surface of the second substrate 312. A second display surface using is provided.

In the above structure, the barrier layer 383 is provided so as to cover the first light-emitting element 331, and the barrier layer 384 is provided so as to cover the second light-emitting element 332. A sealing resin layer 375 is provided between the first substrate 311 and the second substrate 312. By providing the barrier layers 383 and 384 and the sealing resin layer 375, deterioration of the first light-emitting element 331 and the second light-emitting element 332 can be prevented. In addition, a short circuit between the first light-emitting element 331 and the second light-emitting element 332 can be prevented.

In the above structure, the spacer 379 is provided between the first substrate 311 and the second substrate 312. By providing the spacer 379, the distance between the first substrate 311 and the second substrate 312 can be kept uniform. Note that the spacer 379 may be provided between the first substrate 311 and the second substrate 312 without any particular limitation, but is preferably provided only on the insulating layer 397 and the insulating layer 398 that function as banks (partition walls). It is good to provide.

Next, a cross-sectional structure in the case where the first pixel portion 314 is a passive matrix type and the second pixel portion 315 is an active matrix type will be described (see FIG. 6). A first pixel portion 314 is provided on one surface of the first substrate 311. The first pixel portion 314 includes a first light emitting element 341. The first light-emitting element 341 corresponds to a stacked body of a conductive layer 342, an electroluminescent layer 343, and a conductive layer 344. Insulating layers 345a and 345b are provided between adjacent first light-emitting elements 341. A second pixel portion 315 is provided on one surface of the second substrate 312. The second pixel portion 315 includes a second light emitting element 332, a driving transistor 336, and a capacitor 337. A sealing resin layer 375 is filled between the first substrate 311 and the second substrate 312.

In the above structure, the first light-emitting element 341 included in the first pixel portion 314 and the second light-emitting element 332 included in the second pixel portion 315 both perform bottom emission. Therefore, a first display surface using the first pixel portion 314 is provided on the other surface of the first substrate 311, and a second pixel portion 315 is provided on the other surface of the second substrate 312. A second display surface using is provided.

In the above structure, the insulating layer 399 is provided over the driving transistor 336, and the insulating layer 300 is provided over the insulating layer 399. In this manner, with the structure in which the insulating layers are stacked, the margin of the region where the pixel electrode of the second light-emitting element 332 is provided can be widened to increase the aperture ratio. When a high aperture ratio is realized, the driving voltage can be lowered and the power consumption can be reduced with an increase in the light emitting area.

Next, a cross-sectional structure in the case where both the first pixel portion 314 and the second pixel portion 315 are active matrix types will be described (see FIG. 7). A first pixel portion 314 and a driver circuit 335 are provided on one surface of the first substrate 311. The first pixel portion 314 includes a first light emitting element 331, a driving transistor 333, and a capacitor 334. Drive circuit 335 includes an N-type transistor and a P-type transistor connected in series. A second pixel portion 315 and a driver circuit 338 are provided on one surface of the second substrate 312. The second pixel portion 315 includes a second light emitting element 332, a driving transistor 336, and a capacitor 337. The drive circuit 338 includes an N-type transistor and a P-type transistor connected in series.

Each of the first light-emitting element 331 and the second light-emitting element 332 includes a pair of conductive layers and an electroluminescent layer, and one of the pair of conductive layers included in the first light-emitting element 331 is the second The light-emitting element 332 is shared with one of a pair of conductive layers. That is, the first light-emitting element 331 has a structure in which the conductive layer 321, the electroluminescent layer 322, and the conductive layer 323 are stacked. The second light-emitting element 332 has a structure in which a conductive layer 325, an electroluminescent layer 324, and a conductive layer 323 are stacked. The first light emitting element 331 and the second light emitting element 332 share the conductive layer 323.

In the above structure, the first light-emitting element 331 included in the first pixel portion 314 and the second light-emitting element 332 included in the second pixel portion 315 both perform bottom emission. Therefore, a first display surface using the first pixel portion 314 is provided on the other surface of the first substrate 311, and a second pixel portion 315 is provided on the other surface of the second substrate 312. A second display surface using is provided.
(Embodiment 3)

Next, a case where two substrates provided with a light emitting element for emitting bottom emission are bonded and a connection film is provided on one of the two substrates will be described (see FIGS. 8 and 9). The display device of the present invention includes a first substrate 411 and a second substrate 412. The first substrate 411 and the second substrate 412 are provided so that one surface of the first substrate 411 and one surface of the second substrate 412 face each other. The first substrate 411 and the second substrate 412 are attached with a sealant 416.

A first pixel portion 414 including a first light emitting element is provided on one surface of the first substrate 411. The first light-emitting element included in the first pixel portion 414 emits light in the direction of the other surface of the first substrate 411. A second pixel portion 415 including a second light emitting element is provided on one surface of the second substrate 412. The second light-emitting element included in the second pixel portion 415 emits light in the direction of the other surface of the second substrate 412.

In the above structure, the first light-emitting element included in the first pixel portion 414 and the second light-emitting element included in the second pixel portion 415 both perform bottom emission. Therefore, a first display surface using the first pixel portion 414 is provided on the other surface of the first substrate 411, and a second pixel portion 415 is provided on the other surface of the second substrate 412. A second display surface using is provided.

The display device of the present invention uses a plurality of substrates provided with a pixel portion including a light-emitting element, and one substrate also serves as a sealing substrate for another substrate. Therefore, a reduction in size, thickness, and weight can be realized. In addition, since at least two substrates provided with a pixel portion including a light-emitting element are provided so as to face each other, display surfaces using the pixel portion are provided on the front and back sides, and high added value can be realized. it can.

On one surface of the first substrate 411, a connection film 417, an anisotropic conductive layer 493, and a connection conductive layer 491 are provided. The connection film 417 is connected to the printed board 419. A plurality of IC chips 420 are provided on the printed circuit board 419.

Further, a connection conductive layer 446 is provided on one surface of the first substrate 411, and a connection conductive layer 447 is provided on one surface of the second substrate 412 (FIG. 8). (See (B) to (D)). The connection conductive layer 446 and the connection conductive layer 447 are electrically connected by a resin 448 including a conductive spacer.

An IC chip 481 is provided over one surface of the first substrate 411 (see FIG. 8D). The IC chip 481 is attached to the first substrate 411 by a COG method, and is connected to the first pixel portion 414 and the second pixel portion 415 through the anisotropic conductive layer 480. .

Further, an inert gas 470 is filled between one surface of the first substrate 411 and one surface of the second substrate 412 (see FIG. 8B). Further, a sealing resin layer 475 may be provided instead of the inert gas 470 (see FIG. 8C). In the case where the sealing resin layer 475 is provided, a spacer 479 may be provided together with the sealing resin layer 475 in order to keep the thickness between the substrates constant. In addition, a barrier layer may be provided so as to cover the light emitting element. The first substrate 411 and the second substrate 412 are bonded to each other with a sealant 416. In order to further increase the bonding strength between the substrates, the first substrate 411 and the second substrate 412 A sealant 476 may be provided at the end of the substrate (see FIGS. 8C and 8D).

Next, top views of the first substrate 411 and the second substrate 412 having the structure illustrated in FIG. 8D are described (see FIGS. 9A and 9B). Over the first substrate 411, a first pixel portion 414, a sealant 416, a connection conductive layer 446, a spacer 479, an IC chip 481, a drive circuit 435, and a drive circuit 402 are provided. . A second pixel portion 415, a connection conductive layer 447, and a driver circuit 439 are provided over the second substrate 412. Here, the IC chip 481 functions as a source driver for the first pixel portion 414 and the second pixel portion 415.

When the first substrate 411 and the second substrate 412 are bonded to each other, after a resin including a conductive spacer is formed over the connection conductive layer 446, the resin is used to form the resin on the first substrate 411. The connection conductive layer 446 and the connection conductive layer 447 over the second substrate 412 are electrically connected. A spacer 479 on the first substrate 411 is provided to keep the thickness between the first substrate 411 and the second substrate 412 constant. The first pixel portion 414, The driving circuit 435 and the driving circuit 402 are regularly provided. Note that in the case where the spacer 479 is provided over the first pixel portion 414, the spacer 479 may be regularly provided in a region other than the opening 405 of each pixel 454 (see FIG. 9C). The opening 405 is a region where a light emitting element is provided. The region excluding the opening 405 is a region where an insulating layer functioning as a bank (partition wall) is provided.

Next, a detailed cross-sectional structure of the display device having the above configuration (see FIGS. 8 and 9) will be described with reference to the drawings. Note that the first pixel portion 414 and the second pixel portion 415 may employ either an active matrix type or a passive matrix type. There are four combinations as described above. In the following, when both the first pixel portion 414 and the second pixel portion 415 are of an active matrix type (see FIG. 10), the first pixel portion 414 is passive. A cross-sectional structure in the case of the matrix type and the second pixel portion 415 being an active matrix type (see FIG. 11) will be described.

8 and FIGS. 9 to 11, the same reference numerals are used in different drawings, and the description of the portions using the same reference numerals is omitted below.

First, a cross-sectional structure in the case where both the first pixel portion 414 and the second pixel portion 415 are active matrix types will be described (see FIG. 10). A first pixel portion 414 and a driver circuit 435 are provided on one surface of the first substrate 411. The first pixel portion 414 includes a first light emitting element 431, a driving transistor 433, and a capacitor 434. Drive circuit 435 has an N-type transistor and a P-type transistor connected in series. A second pixel portion 415 and a driver circuit 438 are provided on one surface of the second substrate 412. The second pixel portion 415 includes a second light-emitting element 432, a driving transistor 436, and a capacitor 437. The drive circuit 438 has an N-type transistor and a P-type transistor connected in series.

In the above structure, the first light-emitting element 431 included in the first pixel portion 414 and the second light-emitting element 432 included in the second pixel portion 415 both perform bottom emission. Therefore, a first display surface using the first pixel portion 414 is provided on the other surface of the first substrate 411, and a second pixel portion 415 is provided on the other surface of the second substrate 412. A second display surface using is provided.

Further, a connection conductive layer 446 is provided on one surface of the first substrate 411, and a connection conductive layer 447 is provided on one surface of the second substrate 412. The connection conductive layer 446 and the connection conductive layer 447 are electrically connected through a resin 448 including a conductive spacer. Various signals and a power supply potential are supplied to the first pixel portion 414 and the drive circuit 435 through the connection film 417. Various signals and power supply potential are supplied to the second pixel portion 415 and the driver circuit 438 through the connection conductive layers 446 and 447, the resin 448 including conductive spacers, and the connection film 417.

In the above structure, the sealing resin layer 475 is provided between the first substrate 411 and the second substrate 412. By providing the sealing resin layer 475, deterioration of the first light-emitting element 431 and the second light-emitting element 432 can be prevented. In addition, a short circuit between the first light-emitting element 431 and the second light-emitting element 432 can be prevented.

In the above structure, the spacer 479 is provided between the first substrate 411 and the second substrate 412. By providing the spacer 479, the distance between the first substrate 411 and the second substrate 412 can be kept uniform.

Next, a cross-sectional structure in the case where the first pixel portion 414 is a passive matrix type and the second pixel portion 415 is an active matrix type will be described (see FIG. 11). A first pixel portion 414 is provided on one surface of the first substrate 411. The first pixel portion 414 includes a first light emitting element 441. The first light-emitting element 441 corresponds to a stacked body of a conductive layer 442, an electroluminescent layer 443, and a conductive layer 444. Insulating layers 445a and 445b are provided between adjacent first light-emitting elements 441. A second pixel portion 415 is provided on one surface of the second substrate 412. The second pixel portion 415 includes a second light-emitting element 432, a driving transistor 436, and a capacitor 437.

In the above structure, the first light-emitting element 441 included in the first pixel portion 414 and the second light-emitting element 432 included in the second pixel portion 415 both perform bottom emission. Therefore, a first display surface using the first pixel portion 414 is provided on the other surface of the first substrate 411, and a second pixel portion 415 is provided on the other surface of the second substrate 412. A second display surface using is provided.

The display device of the present invention uses a plurality of element substrates provided with a pixel portion including a light-emitting element, and one element substrate among the plurality of element substrates is a sealing substrate of another element substrate. It is also characterized by serving. Rather than providing a sealing substrate corresponding to each of a plurality of element substrates, one element substrate also serves as a sealing substrate for another element substrate, thereby reducing the size, thickness and weight. Realize.

In addition, the display device of the present invention includes at least two element substrates provided with light emitting elements, and the element substrates provided with the light emitting elements are arranged so as to face each other. Is provided on both sides. With the above characteristics, high added value can be realized. The display device of the present invention includes two pixel portions, and the two pixel portions share a controller circuit and a power supply circuit. With the above features, it is possible to achieve downsizing, weight reduction, and price reduction.
(Embodiment 4)

The display device of the present invention is characterized in that display surfaces are provided on the front and back, and the configuration is roughly divided into two. One is a case where a substrate provided with a light emitting element that performs bottom emission and a substrate provided with a light emitting element that performs top emission are bonded together (see FIG. 20), and the other is a light emitting element that performs bottom emission. This is a case where two substrates provided with are bonded together (see FIGS. 23 and 25). When the two substrates with the light emitting element for emitting the bottom surface are bonded together, a connection film is provided on each of the two substrates (see FIG. 23), and a connection film is provided on one of the two substrates. It is divided into the cases (see FIG. 25).

First, a case where a substrate provided with a light emitting element for performing bottom emission and a substrate provided with a light emitting element for performing top emission are bonded together and a connection film is provided on each of the two substrates will be described (FIG. 20).

The display device of the present invention includes a first substrate 211, a second substrate 212, and a third substrate 213 (see FIGS. 20A and 20B). The first substrate 211 and the second substrate 212 are provided so that one surface of the first substrate 211 and the other surface of the second substrate 212 face each other. The second substrate 212 and the third substrate 213 are provided so that one surface of the second substrate 212 and one surface of the third substrate 213 face each other. The first substrate 211 and the second substrate 212, and the second substrate 212 and the third substrate 213 are bonded to each other with a sealant 216.

A first pixel portion 214 including a first light-emitting element is provided over one surface of the first substrate 211 (see FIG. 20C). Over one surface of the second substrate 212, a second pixel portion 215 including a second light-emitting element and a functional circuit portion 285 including an element group are provided (see FIG. 20D). The element group includes at least a plurality of transistors.

The first light-emitting element included in the first pixel portion 214 emits light in the direction of the other surface of the first substrate 211. The second light emitting element included in the second pixel portion 215 emits light in the direction of the other surface of the third substrate 213. That is, the first light emitting element included in the first pixel portion 214 performs bottom emission, and the second light emitting element included in the second pixel portion 215 performs top emission. A first display surface using the first pixel portion is provided on the other surface of the first substrate 211, and the second pixel portion is used for the other surface of the third substrate 213. A second display surface is provided.

The display device of the present invention is characterized in that the area of the first pixel portion 214 and the area of the second pixel portion 215 are different from each other. The display device of the present invention is characterized in that the area of the first display surface using the first pixel portion 214 and the area of the second display surface using the second pixel portion 215 are different from each other.

As described above, the present invention is characterized in that the area of the first display surface and the area of the second display surface are different from each other, while the second substrate 212 also serves as a sealing substrate for the first substrate 211. This is also a feature, and the area of the first substrate 211 and the area of the second substrate 212 are the same. Therefore, the present invention is characterized in that a functional circuit portion 285 including a plurality of transistors is provided on the second substrate 212 in addition to the second pixel portion 215 in order to effectively use the second substrate 212. To do.

The functional circuit unit 285 includes a central processing circuit (CPU, Central Processing Unit), a memory circuit, a buffer circuit, an interface circuit, a timing signal generation circuit, a format conversion circuit, a frame memory circuit, an image processing circuit, an audio processing circuit, a transmission / reception circuit, It includes a plurality of transistors constituting one or more selected from a correction circuit, a time detection circuit, a temperature detection circuit, an illuminance detection circuit, a register circuit, a decoder circuit, a frequency divider circuit, a digital signal processing dedicated processor circuit, or the like. By providing the functional circuit portion 285, the number of IC chips provided outside can be reduced, so that reduction in size, thickness, and weight can be realized.

Of the circuits configured by the functional circuit unit 285, the illuminance detection circuit is a circuit including an optical sensor. Therefore, the functional circuit unit 285 is provided with not only a plurality of transistors but also an image sensor as an optical sensor, for example. Either an photodiode or a phototransistor may be used as the imaging element, and any of a PN-type diode, a PIN-type diode, a Schottky-type diode, and an avalanche-type diode may be used as the photodiode. Since the PIN diode has a low junction capacitance, there is an advantage that a high-speed response can be obtained. Further, the avalanche diode has an advantage that it can detect faint light because it has a very fast response and a doubling action.

Note that in the above structure, the first pixel portion 214 is provided over the first substrate 211, the second pixel portion 215 and the functional circuit portion 285 are provided over the second substrate 212. Although the case where the area of the first display surface using the pixel portion 214 is larger than the area of the second display surface using the second pixel portion 215 is shown, the present invention is not limited to this mode. The functional circuit portion 285 is provided over the first substrate 211 or the second substrate 212. The first pixel portion 214 and the functional circuit portion 285 are provided over the first substrate 211, and the second circuit portion 285 is provided. Only the second pixel portion 215 may be provided over the substrate 212. In this case, the area of the first display surface using the first pixel portion 214 is smaller than the area of the second display surface using the second pixel portion 215.

In the above structure, the second pixel portion 215 and the functional circuit portion 285 are provided over the second substrate 212. More specifically, functional circuit portions 285 are provided above and below the second pixel portion 215. However, the arrangement of the second pixel portion 215 and the functional circuit portion 285 on the second substrate 212 is not particularly limited.

A first connection film 217, an anisotropic conductive layer 293, and a connection conductive layer 291 are provided on one surface of the first substrate 211. The first connection film 217 is connected to the first pixel portion 214 through the anisotropic conductive layer 293 and the connection conductive layer 291. A second connection film 218, an anisotropic conductive layer 294, and a connection conductive layer 292 are provided on one surface of the second substrate 212. The second connection film 218 is connected to the second pixel portion 215 and the functional circuit portion 285 through the anisotropic conductive layer 294 and the connection conductive layer 292. Both the first connection film 217 and the second connection film 218 are connected to the printed circuit board 219. The printed circuit board 219 is provided with a plurality of IC chips 220, and each of the plurality of IC chips 220 corresponds to one or more selected from a controller circuit, a power supply circuit, a central processing circuit, and the like. The plurality of IC chips 220 supply signals and power supply potentials to the first pixel portion 214, the second pixel portion 215, and the functional circuit portion 285 through the first connection film 217 or the second connection film 218. To do.

An inert gas 271 is filled between one surface of the first substrate 211 and the other surface of the second substrate 212 in order to prevent deterioration of the light emitting element. In addition, an inert gas 272 is filled between one surface of the second substrate 212 and one surface of the third substrate 213 (see FIG. 20A). The inert gases 271 and 272 indicate, for example, a rare gas or a nitrogen gas. Note that the sealing resin layer 273 is provided between the one surface of the first substrate 211 and the other surface of the second substrate 212 instead of the inert gas to fill the space between the substrates. A sealing resin layer 274 may be provided between one surface of the substrate 212 and one surface of the third substrate 213 (see FIG. 20B). For the sealing resin layers 273 and 274, a thermosetting resin material or an ultraviolet light curable resin material may be used. When the sealing resin layers 273 and 274 are provided, the thickness between the substrates is kept constant. A spacer material may be provided together with the sealing resin layers 273 and 274. In addition, a layer containing a material having a high barrier property such as a metal oxide or a nitride oxide (hereinafter sometimes abbreviated as a barrier layer) may be provided so as to cover the light-emitting element. As described above, as a method for preventing the deterioration of the light-emitting element, any one of a method of filling an inert gas, a method of providing a sealing resin layer, and a method of providing a barrier layer may be used, or a plurality of combinations may be used. May be used.

In addition, the first substrate 211 and the second substrate 212, and the second substrate 212 and the third substrate 213 are bonded to each other with the sealant 216. In order to further increase the bonding strength between the substrates, A sealant 276 may be further provided on end portions of the first substrate 211, the second substrate 212, and the third substrate 213 (see FIG. 20B).

In addition, an IC chip may be provided on one surface of the first substrate 211 and one surface of the second substrate 212 by a COG method. The IC chip functions as a driver circuit that controls operations of the first pixel portion 214 and the second pixel portion 215. The IC chip has a thickness of about 20 to 40 μm even if it is thinned, while the thickness between the two substrates is about 10 μm. Therefore, in the case where an IC chip is provided on one surface of the first substrate 211, the thickness between the first substrate 211 and the second substrate 212 may be adjusted as appropriate.

Next, a cross-sectional structure of the display device having the above structure (see FIGS. 20A to 20D) will be described with reference to the drawings. For the first pixel portion 214 and the second pixel portion 215, either an active matrix type in which each pixel is provided with a light emitting element and a transistor or a passive matrix type in which each pixel is provided with only a light emitting element is adopted. Is done. There are four combinations. First, when both the first pixel portion 214 and the second pixel portion 215 are active matrix type, the second is that the first pixel portion 214 is active matrix type. When the second pixel portion 215 is a passive matrix type, the third is the first pixel portion 214 is the passive matrix type, and when the second pixel portion 215 is the active matrix type, the fourth is the first This is a case where both the pixel portion 214 and the second pixel portion 215 are of a passive matrix type. In the following, when both the first pixel portion 214 and the second pixel portion 215 are an active matrix type (see FIG. 21), the first pixel portion 214 is a passive matrix type, and the second pixel portion 215 A cross-sectional structure in the case of the active matrix type (see FIG. 22) will be described.

20A and 20B and FIGS. 21 and 22, the same reference numerals are used in common in different drawings, and a description of the portions using the same reference numerals is given below. Is omitted.

First, a cross-sectional structure in the case where both the first pixel portion 214 and the second pixel portion 215 are active matrix types will be described (see FIG. 21). A first pixel portion 214 and a driver circuit portion 225 are provided on one surface of the first substrate 211. The first pixel portion 214 includes a first light emitting element 222 and a driving transistor 221. The first light-emitting element 222 has a structure in which an electroluminescent layer is sandwiched between a pair of conductive layers. One of the pair of conductive layers of the first light-emitting element 222 is connected to a conductive layer functioning as a source wiring or a drain wiring of the driving transistor 221. In addition, the driver circuit portion 225 includes an element group 226 including a plurality of transistors. The driver circuit portion 225 includes a transistor included in a circuit that controls the operation of the first pixel portion 214, and may be provided as necessary. Further, an inert gas 271 is filled between the first substrate 211 and the second substrate 212.

A second pixel portion 215 and a functional circuit portion 285 are provided on one surface of the second substrate 212. The second pixel portion 215 includes a second light emitting element 224 and a driving transistor 223. The second light-emitting element 224 has a structure in which an electroluminescent layer is sandwiched between a pair of conductive layers. One of the pair of conductive layers of the second light-emitting element 224 is connected to a conductive layer functioning as a source wiring or a drain wiring of the driving transistor 223. The functional circuit portion 285 includes an element group 227 including a plurality of transistors and an imaging element 228. An inert gas 272 is filled between the second substrate 212 and the third substrate 213.

In the above structure, the first light-emitting element 222 included in the first pixel portion 214 performs bottom emission, and the second light-emitting element 224 included in the second pixel portion 215 performs top emission. Accordingly, a first display surface using the first pixel portion 214 is provided on the other surface of the first substrate 211, and a second pixel portion 215 is provided on the other surface of the third substrate 213. A second display surface using is provided. The area of the first display surface and the area of the second display surface are different from each other.

Next, a cross-sectional structure in the case where the first pixel portion 214 is a passive matrix type and the second pixel portion 215 is an active matrix type will be described (see FIG. 22). A first pixel portion 214 is provided on one surface of the first substrate 211. The first pixel portion 214 includes a first light emitting element 231. The first light-emitting element 231 corresponds to a stacked body of the first conductive layer 232, the electroluminescent layer 233, and the second conductive layer 234. Insulating layers 235 and 236 are provided between adjacent first light emitting elements 231. A sealing resin layer 273 is filled between the first substrate 211 and the second substrate 212.

A second pixel portion 215 and a functional circuit portion 285 are provided on one surface of the second substrate 212. The second pixel portion 215 includes a second light emitting element 224 and a driving transistor 223. The functional circuit portion 285 includes an element group 227 including a plurality of transistors. A sealing resin layer 274 is filled between the second substrate 212 and the third substrate 213.

In the above structure, the first light-emitting element 231 included in the first pixel portion 214 performs bottom emission, and the second light-emitting element 224 included in the second pixel portion 215 performs top emission. Accordingly, a first display surface using the first pixel portion 214 is provided on the other surface of the first substrate 211, and a second pixel portion 215 is provided on the other surface of the third substrate 213. A second display surface using is provided. The area of the first display surface and the area of the second display surface are different from each other.
(Embodiment 5)

Subsequently, a case where two substrates each provided with a light emitting element for performing bottom emission are bonded and a connection film is provided on each of the two substrates will be described (see FIGS. 23A and 23B). . The display device of the present invention includes a first substrate 611 and a second substrate 612. The first substrate 611 and the second substrate 612 are provided so that one surface of the first substrate 611 and one surface of the second substrate 612 face each other. The first substrate 611 and the second substrate 612 are attached with a sealant 616.

A first pixel portion 614 including a first light-emitting element is provided over one surface of the first substrate 611 (see FIG. 20C). Over one surface of the second substrate 612, a second pixel portion 615 including a second light-emitting element and a functional circuit portion 685 including a plurality of transistors are provided (see FIG. 20D). .

The first light-emitting element included in the first pixel portion 614 emits light in the direction of the other surface of the first substrate 611. The second light-emitting element included in the second pixel portion 615 emits light in the direction of the other surface of the second substrate 612. That is, both the first light-emitting element included in the first pixel portion 614 and the second light-emitting element included in the second pixel portion 615 perform bottom emission. Therefore, a first display surface using the first pixel portion 614 is provided on the other surface of the first substrate 611, and a second pixel portion 615 is provided on the other surface of the second substrate 612. A second display surface using is provided.

On one surface of the first substrate 611, a first connection film 617, an anisotropic conductive layer 693, and a connection conductive layer 691 are provided. On one surface of the second substrate 612, a second connection film 618, an anisotropic conductive layer 694, and a connection conductive layer 692 are provided. Both the first connection film 617 and the second connection film 618 are connected to the printed circuit board 619. A plurality of IC chips 620 are provided on the printed circuit board 619. Note that a film in which connection terminals are provided on both surfaces (one surface and the other surface) may be used as the second connection film 618. Alternatively, as the second connection film 618, two films each provided with a connection terminal on one surface and a connector that electrically connects the two films may be used.

An inert gas 670 is filled between one surface of the first substrate 611 and one surface of the second substrate 612 in order to prevent deterioration of the light-emitting element (see FIG. 23A). ). Note that a sealing resin layer 675 may be provided instead of the inert gas 670 (see FIG. 23B). When the sealing resin layer 675 is provided, a spacer member 679 may be provided together with the sealing resin layer 675 in order to keep the thickness between the substrates constant. In addition, a barrier layer may be provided so as to cover the light emitting element. The first substrate 611 and the second substrate 612 are bonded to each other with a sealant 616. In order to further increase the bonding strength between the substrates, the first substrate 611 and the second substrate 612 A sealant 676 may be provided at the end of the substrate (see FIG. 23B).

Further, an IC chip may be provided on one surface of the first substrate 611 and one surface of the second substrate 612 by a COG method. The IC chip is used as a driver circuit that controls operations of the first pixel portion 614 and the second pixel portion 615. However, the thickness of the IC chip is about 30 μm even if the thickness is reduced, while the thickness between the first substrate 611 and the second substrate 612 is about 10 μm. Therefore, in the case where the first substrate 611 is provided over one surface of the first substrate 611 and the second substrate 612, the thickness between the first substrate 611 and the second substrate 612 may be adjusted as appropriate.

Next, a detailed cross-sectional structure of the display device having the above structure (see FIGS. 23A and 23B) will be described with reference to the drawings. For the first pixel portion 614 and the second pixel portion 615, either of an active matrix type or a passive matrix type may be employed. There are four combinations as described above, and a cross-sectional structure in the case where both the first pixel portion 614 and the second pixel portion 615 are active matrix type (see FIG. 24) will be described below.

Note that in FIG. 23 and FIG. 24, the same reference numerals are used in different drawings, and description of portions using the same reference numerals is omitted below.

On one surface of the first substrate 611, a first pixel portion 614 including a first light-emitting element and a driver circuit portion 625 are provided. The first pixel portion 614 includes a first light-emitting element 622 and a driving transistor 621. The driver circuit portion 625 includes an element group 626. Over one surface of the second substrate 612, a second pixel portion 615 including a second light emitting element and a functional circuit portion 685 including a plurality of transistors are provided. The second pixel portion includes a second light-emitting element 624 and a driving transistor 623. The functional circuit portion 685 includes an element group 627.

In the above structure, the first light-emitting element 622 included in the first pixel portion 614 and the second light-emitting element 624 included in the second pixel portion 615 both perform bottom emission. Therefore, a first display surface using the first pixel portion 614 is provided on the other surface of the first substrate 611, and a second pixel portion 615 is provided on the other surface of the second substrate 612. A second display surface using is provided.

In the above structure, the barrier layer 683 is provided so as to cover the first light-emitting element 622, and the barrier layer 684 is provided so as to cover the second light-emitting element 624. A sealing resin layer 675 is provided between the first substrate 611 and the second substrate 612. By providing the barrier layers 683 and 684 and the sealing resin layer 675, deterioration of the first light-emitting element 622 and the second light-emitting element 624 can be prevented. In addition, a short circuit between the first light-emitting element 622 and the second light-emitting element 624 can be prevented.

In the above structure, the spacer material 679 is provided between the first substrate 611 and the second substrate 612. By providing the spacer material 679, the distance between the first substrate 611 and the second substrate 612 can be kept uniform. Note that the spacer material 679 may be provided without limitation between the first substrate 611 and the second substrate 612, but preferably provided only on the insulating layers 697 and 698 functioning as banks (partition walls). Good. In the case where the spacer material 679 is provided only over the insulating layers 697 and 698 functioning as banks (partition walls), the spacer material 679 may be formed by a photolithography method.
(Embodiment 6)

Next, a case where two substrates provided with a light emitting element for emitting bottom surface are bonded and a connection film is provided on one of the two substrates will be described (see FIG. 25). The display device of the present invention includes a first substrate 711 and a second substrate 712. The first substrate 711 and the second substrate 712 are provided so that one surface of the first substrate 711 and one surface of the second substrate 712 face each other. The first substrate 711 and the second substrate 712 are attached to each other with a sealant 716.

A first pixel portion 714 including a first light emitting element is provided on one surface of the first substrate 711. Over one surface of the second substrate 712, a second pixel portion 715 including a second light-emitting element and a functional circuit portion 785 including a plurality of transistors are provided.

The first light-emitting element included in the first pixel portion 714 emits light in the direction of the other surface of the first substrate 711. The second light-emitting element included in the second pixel portion 715 emits light in the direction of the other surface of the second substrate 712. In the above structure, the first light-emitting element included in the first pixel portion 714 and the second light-emitting element included in the second pixel portion 715 both perform bottom emission. Therefore, a first display surface using the first pixel portion 714 is provided on the other surface of the first substrate 711, and a second pixel portion 715 is provided on the other surface of the second substrate 712. A second display surface using is provided.

A connection film 717, an anisotropic conductive layer 793, and a connection conductive layer 791 are provided on one surface of the first substrate 711. The connection film 717 is connected to the printed circuit board 719. A plurality of IC chips 720 are provided on the printed board 719.

In addition, a connection conductive layer 746 is provided on one surface of the first substrate 711, and a connection conductive layer 747 is provided on one surface of the second substrate 712. The connection conductive layer 746 and the connection conductive layer 747 are electrically connected by a conductive spacer material 748. The conductive spacer material 748 is a material including at least a surface of a particulate spacer material coated with a conductive material (for example, gold). For example, the surface of the particulate spacer material is coated with a conductive material. And a material containing a resin material.

Further, an IC chip 781 may be provided over one surface of the first substrate 711 (see FIG. 25C). The IC chip 781 is attached to the first substrate 711 by a COG method, and the first pixel portion 714, the second pixel portion 715, and the functional circuit are interposed via the anisotropic conductive layer 780. Connected to the unit 785.

In addition, an inert gas 770 is filled between one surface of the first substrate 711 and one surface of the second substrate 712 (see FIG. 25A). However, a sealing resin layer 775 may be provided instead of the inert gas 770 (see FIG. 25B). In the case where the sealing resin layer 775 is provided, a spacer material 779 is preferably provided together with the sealing resin layer 775 in order to keep the thickness between the substrates constant. In addition, a barrier layer may be provided so as to cover the light emitting element. In addition, although the first substrate 711 and the second substrate 712 are bonded to each other with the sealant 716, in order to further increase the bonding strength between the substrates, the first substrate 711 and the second substrate 712 A sealant 776 may be provided at the end of the substrate (see FIGS. 25B and 25C).

Next, top views of the first substrate 711 and the second substrate 712 having the structure illustrated in FIG. 25C are described (see FIGS. 26A and 26B). Over the first substrate 711, a first pixel portion 714, a sealant 716, a connection conductive layer 746, a spacer material 779, an IC chip 781, and drive circuit portions 725 and 741 are provided. . A second pixel portion 715 and a connection conductive layer 747 are provided over the second substrate 712. The IC chip 781 preferably functions as a source driver for the first pixel portion 714 and the second pixel portion 715.

When the first substrate 711 and the second substrate 712 are bonded to each other, the conductive spacer material 748 is formed over the connection conductive layer 746 and then the first substrate 711 is used by using the conductive spacer material 748. The connection conductive layer 746 and the connection conductive layer 747 on the second substrate 712 are electrically connected to each other. The spacer material 779 on the first substrate 711 is provided to keep the thickness between the first substrate 711 and the second substrate 712 constant, and the first pixel portion 714 The drive circuit portions 725 and 741 are regularly provided. Note that in the case where the spacer material 779 is provided over the first pixel portion 714, the spacer material 779 may be regularly provided in a region other than the opening 705 of each pixel 754 (see FIG. 26C). Note that the opening 705 is a region where the light-emitting element emits light, and the region excluding the opening 705 is a region where an insulating layer functioning as a bank (partition wall) is provided.

Next, a detailed cross-sectional structure of the display device having the above configuration (see FIGS. 25 and 26) will be described with reference to the drawings. Note that the first pixel portion 714 and the second pixel portion 715 may employ either an active matrix type or a passive matrix type. There are four combinations as described above, and a cross-sectional structure in the case where both the first pixel portion 714 and the second pixel portion 715 are active matrix types (see FIG. 27) will be described below.

In FIG. 25 and FIGS. 26 and 27, the same reference numerals are used in common in different drawings, and the description of the portions using the same reference numerals is omitted below.

First, a cross-sectional structure in the case where both the first pixel portion 714 and the second pixel portion 715 are active matrix types will be described (see FIG. 27). A first pixel portion 714 and a driver circuit portion 725 are provided on one surface of the first substrate 711. The first pixel portion 714 includes a first light emitting element 722 and a driving transistor 721. The driver circuit portion 725 includes an element group 726. A second pixel portion 715 and a functional circuit portion 785 are provided on one surface of the second substrate 712. The second pixel portion 715 includes a second light emitting element 724 and a driving transistor 723. The functional circuit portion 785 includes an element group 727.

In the above structure, the first light-emitting element 722 included in the first pixel portion 714 and the second light-emitting element 724 included in the second pixel portion 715 both perform bottom emission. A first display surface using the first pixel portion 714 is provided on the other surface of the first substrate 711, and the second pixel portion 715 is used for the other surface of the second substrate 712. A second display surface is provided.

In the above structure, the barrier layer 683 is provided so as to cover the first light-emitting element 722, and the barrier layer 684 is provided so as to cover the second light-emitting element 624.

In addition, a connection conductive layer 746 is provided on one surface of the first substrate 711, and a connection conductive layer 747 is provided on one surface of the second substrate 712. The connection conductive layer 746 and the connection conductive layer 747 are electrically connected through a conductive spacer material 748. Various signals and a power supply potential are supplied to the first pixel portion 714 and the drive circuit portion 725 through the connection film 717. In the second pixel portion 715 and the functional circuit portion 785, various signals and power supply potentials are connected through the connection conductive layer 746, the conductive spacer material 748, the second connection conductive layer 747, and the connection film 717. Is supplied.

In the above structure, the sealing resin layer 775 is provided between the first substrate 711 and the second substrate 712. By providing the sealing resin layer 775, deterioration of the first light-emitting element 722 and the second light-emitting element 724 can be prevented. In addition, a short circuit between the first light-emitting element 722 and the second light-emitting element 724 can be prevented.

In the above structure, the spacer material 779 is provided between the first substrate 711 and the second substrate 712. By providing the spacer material 779, the distance between the first substrate 711 and the second substrate 712 can be kept uniform.
(Embodiment 7)

The display device of the present invention includes a functional circuit portion 285. Below, the structural example of the functional circuit part 285 is demonstrated with reference to drawings.

The functional circuit unit 285 having the first configuration includes memory circuits 131 and 133, a central processing circuit 132, and a temporary processing circuit for signals including volatile memories such as SRAM (Static Random Access Memory) and DRAM (Dynamic Random Access Memory). It has an interface circuit 134 that performs storage and format conversion, and a system bus 135 (see FIG. 28). Various signals supplied from an external device are input to the central processing circuit 132 via the interface circuit 134 and the system bus 135. The central processing circuit 132 processes image data and sends a control signal for the logic circuit to the memory circuit 131. The memory circuit 131 temporarily stores the data supplied from the central processing circuit 132. Further, the central processing circuit 132 sends the processed image data to the memory circuit 133, and the memory circuit 133 stores the supplied data. The image data stored in the memory circuit 133 is supplied to each pixel unit via the drive circuit.

The functional circuit unit 285 having the second configuration includes a clock signal that determines the operation timing of each circuit, a timing signal generation circuit 136 that generates a clock back signal, image processing such as conversion of a compression-coded signal and image interpolation. A format conversion circuit 137 for performing the format conversion and a frame memory circuit 138 for storing the format-converted image data (see FIG. 29). The image data stored in the frame memory circuit 138 is supplied to each pixel unit via the drive circuit.

The functional circuit unit 285 having the third configuration includes a memory circuit 133, a memory circuit 139 that stores program data and image data, an image processing circuit 140, a memory circuit 131, a central processing circuit 132, an interface circuit 134, and a system bus 135. (See FIG. 30). The data stored in the memory circuit 139 is processed by the central processing circuit 132 by performing reading and writing processes with the memory circuit 131 as needed. The image processing circuit 140 performs conversion such as resizing on the image data, and the converted image data is stored in the memory circuit 133. The image data stored in the memory circuit 133 is supplied to each pixel unit via the drive circuit.

Each circuit included in the functional circuit portion 285 includes a transistor having a semiconductor layer as an active layer. Since each circuit is required to operate at high speed, a transistor having a crystalline semiconductor layer as an active layer is preferably used. The configuration of the functional circuit unit 285 is not limited to the above, and one or more types selected from a register circuit, a decoder circuit, a counter circuit, a frequency divider circuit, a digital signal processing dedicated processor circuit (DSP, Digital Signal Processor), and the like are used. May be included. When a transistor having a crystalline semiconductor layer as an active layer is used, monolithic formation in which various circuit groups are formed on an insulating surface is realized. Such a panel can reduce the number of peripheral circuits such as ICs to be connected. A system-on-panel manufactured by building various circuits on the same substrate as the functional circuit portion 285 can be reduced in size, weight, and thickness.
(Embodiment 8)

The structure of the display device of the present invention will be described with reference to the drawings. The display device of the present invention includes a first pixel portion 514, a second pixel portion 515, a controller circuit 26, a power supply circuit 27, and a central processing circuit 28 (see FIG. 12A).

The central processing circuit 28 supplies a synchronization signal such as a clock signal and a video signal to the controller circuit 26. The power supply circuit 27 supplies a power supply potential to the first pixel portion 514 and the second pixel portion 515. The controller circuit 26 generates a clock signal, a clock inversion signal, a start pulse signal and a latch signal, and converts a video signal based on the signal supplied from the central processing circuit 28. The conversion of the video signal refers to, for example, converting an analog video signal into a video signal for time gradation. The controller circuit 26 supplies the generated signals and converted video signals to the first pixel portion 514 and the second pixel portion 515. Note that signals supplied from the controller circuit 26 to the pixel units may be collectively referred to as control signals.

Next, the case where the first pixel portion 514, the second pixel portion 515, the controller circuit 26, the power supply circuit 27, the central processing circuit 28, and the switching circuit 29 are provided will be described (see FIGS. 12B to 12D). ).

First, an operation when one of the two pixel portions is selected will be described. The central processing circuit 28 outputs a pixel unit selection signal for selecting one of the two pixel units to the switching circuit 29. Based on the pixel portion selection signal output to the switching circuit 29, the controller circuit 26 outputs a control signal to one of the first pixel portion 514 and the second pixel portion 515 and does not output a control signal to the other. The power supply circuit 27 also supplies a power supply potential to one of the first pixel portion 514 and the second pixel portion 515 based on the pixel portion selection signal output to the switching circuit 29, and supplies the power supply potential to the other. do not do. That is, one of the first pixel portion 514 and the second pixel portion 515 is in a state in which a control signal is supplied from the controller circuit 26 and a power supply potential is supplied from the power supply circuit 27 (also referred to as an operation state). On the other hand, the control signal is not supplied from the controller circuit 26 and the power supply potential is not supplied from the power supply circuit 27 (referred to as a standby state) (see FIGS. 12B and 12C).

Next, an operation when both of the two pixel portions are selected will be described. The central processing circuit 28 outputs a pixel part selection signal for selecting two pixel parts to the switching circuit 29. The controller circuit 26 outputs a control signal to the two pixel portions, and the power supply circuit 27 also supplies a power supply potential to the two pixel portions (see FIG. 12D). That is, the two pixel portions are in an operating state.

Note that each circuit of the controller circuit 26, the power supply circuit 27, the central processing circuit 28, and the switching circuit 29 is provided as an IC chip on the printed board, but if possible, an element on the board on which the pixel portion is provided is provided. It may be formed integrally with the pixel portion, or may be attached as an IC chip by a COG method on a substrate provided with the pixel portion.

According to the above configuration, since the first pixel portion 514 and the second pixel portion 515 share the controller circuit 26 and the power supply circuit 27, the number of IC chips can be reduced, and the size and thickness can be reduced. Light weight and low price can be realized. This embodiment mode can be freely combined with the above embodiment modes.
(Embodiment 9)

The display device of the present invention has two pixel portions. The two pixel portions share a controller circuit and a power supply circuit. The following is a configuration example of the pixel portion, and four typical configurations will be described with reference to the drawings.

First, an active matrix structure (a pixel including two TFTs) including a light emitting element 57 and two transistors in one pixel 54 will be described (see FIG. 13).

The pixel unit 53 includes a plurality of source lines S1 to Sx (x is a natural number), a plurality of gate lines G1 to Gy (y is a natural number), a plurality of power supply lines V1 to Vx, and a plurality of power supply lines Va1 to Vay. And a plurality of pixels 54. Around the pixel portion 53, a controller circuit 26, a power supply circuit 27, a source driver 51, and a gate driver 52 are provided.

The controller circuit 26 supplies various signals to the source driver 51 and the gate driver 52. The power supply circuit 27 supplies a power supply potential to the pixel portion 53 through the plurality of power supply lines V1 to Vx and the plurality of power supply lines Va1 to Vay. The source driver 51 supplies a video signal to each pixel 54 via a plurality of source lines S1 to Sx. The gate driver 52 supplies a gate selection signal to each pixel 54 via a plurality of gate lines G1 to Gy.

The pixel 54 includes a switching transistor 55 that controls input of a video signal to the pixel 54 (sometimes referred to as a first transistor) and a driving transistor 56 that controls a current value flowing between both electrodes of the light emitting element 57 (first transistor). 2, and includes a capacitor 58 and a light-emitting element 57 that hold the gate-source voltage of the driving transistor 56. Note that the capacitor 58 is provided to hold the gate-source voltage of the driving transistor 56. When the capacitor 58 can be held by the gate capacitance or parasitic capacitance of the driving transistor 56, the capacitor 58 is provided. It does not have to be.

Next, an active matrix structure (a pixel including three TFTs) including the light emitting element 57 and three transistors in one pixel 54 will be described (see FIG. 14).

In this configuration, the capacitive element 58 in the above configuration (see FIG. 13) is deleted, and a plurality of gate lines R1 to Ry, a gate driver 59, and an erasing transistor 60 are added. The controller circuit 26 is connected to the gate driver 59. Further, the gate driver 59 supplies a gate selection signal to the pixel portion 53 through the plurality of gate lines R1 to Ry.

The erasing transistor 60 (sometimes referred to as a third transistor) is a transistor that controls the on state and the off state of the driving transistor 56. Since the light emission of the light emitting element 57 depends on the on state and the off state of the driving transistor 56, a state in which no current flows through the light emitting element 57 can be created by arranging the erasing transistor 60. Therefore, the lighting period can be started at the same time as or immediately after the start of the writing period without waiting for signal writing to all the pixels. Therefore, the duty ratio is improved and the moving image can be displayed satisfactorily. In this configuration, since the gate capacitance of the driving transistor 56 is used as a capacitance for holding the gate-source voltage of the driving transistor 56, the capacitive element is not clearly shown. However, if necessary, a capacitive element may be explicitly provided.

Next, an active matrix structure (a pixel including four TFTs) including the light emitting element 57 and four transistors in one pixel 54 will be described (see FIG. 15).

In this configuration, the driving transistor 56 in the above configuration (see FIG. 14) is deleted, and a plurality of power supply lines P1 to Px, a driving transistor 61, and a current control transistor 62 are added. The power supply circuit 27 supplies a power supply potential to the pixel unit 53 via a plurality of power supply lines P1 to Px.

The driving transistor 61 operates in a saturation region by fixing the potential of the gate electrode by connecting the power supply line Pm (1 ≦ m ≦ x, where m is a natural number) holding the gate electrode at a constant potential. Let In addition, a video signal that conveys information of lighting or non-lighting of the pixel is input to the gate electrode of the current controlling transistor 62 that is connected in series with the driving transistor 61 and operates in a linear region via the switching transistor 55. Is done. Since the value of the source-drain voltage of the current control transistor 62 operating in the linear region is small, a slight variation in the gate-source voltage of the current control transistor 62 will affect the value of the current flowing through the light emitting element 57. Don't call it. Accordingly, the value of the current flowing through the light emitting element 57 is determined by the driving transistor 61 operating in the saturation region. In this configuration, since the gate capacitance of the driving transistor 56 is used as a capacitance for holding the gate-source voltage of the driving transistor 56, the capacitive element is not clearly shown. However, if necessary, a capacitive element may be explicitly provided.

The conductivity types of the switching transistor 55, the driving transistor 56, the erasing transistor 60, the driving transistor 61, and the current control transistor 62 are not particularly limited. Either N channel type or P channel type may be used.

Next, a passive matrix structure including the light-emitting element 57 in one pixel 54 will be described (see FIG. 16).

The pixel portion 53 includes a plurality of source lines S1 to Sx (x is a natural number), a plurality of gate lines G1 to Gy (y is a natural number), and a plurality of pixels 54. Each of the plurality of pixels 54 includes a light emitting element 57. Of the pair of conductive layers included in the light emitting element 57, one is a conductive layer constituting the source line Sm (1 ≦ m ≦ x), and the other is a conductive layer constituting the gate line Gn (1 ≦ n ≦ y). is there.

Around the pixel portion 53, a controller circuit 26, a power supply circuit 27, a source driver 51, and a gate driver 52 are provided. The source driver 51 includes a plurality of constant current sources 63 and a plurality of switches 64. The gate driver 52 has a plurality of switches 65. One electrode of the light emitting element 57 is connected to the constant current source 63 via the switch 64. Further, the other electrode of the light emitting element 57 is connected to the power supply circuit 27 via the switch 65.

In any of the above configurations, the pixel portion 53 includes a plurality of pixels 54. When performing color display, each of the plurality of pixels 54 includes a pixel corresponding to red, a pixel corresponding to green, and It corresponds to one of the pixels corresponding to blue. Pixel arrangement is red, green, and blue with stripes arranged in stripes, mosaic with the same color pixels arranged diagonally, red pixels, green pixels, and blue pixels with triangles It may be any of the delta shapes arranged in The stripe shape is suitable for displaying information data such as lines, figures, and characters, and the mosaic shape and delta shape are suitable for displaying image data such as images. Therefore, for example, when using data to be displayed in the two pixel portions, such as displaying one of the two pixel portions and displaying the other image data, the other is displaying the image data. Pixels are arranged in a stripe pattern, and a pixel portion that displays image data may have a plurality of pixels arranged in a mosaic pattern or a delta pattern.

Further, when performing color display, a set of three of red pixels, blue pixels, and green pixels is usually provided in a matrix, but the present invention is not limited to this configuration. A set of four pixels of a red pixel, a blue pixel, a green pixel, and a white pixel may be provided in a matrix. This embodiment mode can be freely combined with the above embodiment modes.
(Embodiment 10)

The display device of the present invention has two pixel portions and has a display surface on each of the front and back sides. There are no restrictions on the video signal supplied to each of the first pixel portion and the second pixel portion, and either an analog video signal or a digital video signal may be supplied. There are four combinations of the video signal supply. The first is to supply an analog video signal to both the first pixel portion and the second pixel portion, and the second is an analog to the first pixel portion. When the video signal is supplied to the second pixel portion and the digital video signal is supplied to the second pixel portion, the third video signal is supplied to the first pixel portion and the analog video signal is supplied to the second pixel portion. In the fourth case, a digital video signal is supplied to both the first pixel portion and the second pixel portion.

Of the above combinations, for example, the main pixel unit that mainly performs video and high-definition display is supplied with a digital video signal for digital display, and mainly displays still images such as character information and graphic information. An analog video signal may be supplied to the sub pixel portion to be used for analog display. Since the pixel portion that performs analog display has a small number of signal writings, power consumption of the source driver can be suppressed. In addition, since the number of times of writing is small, the video signal can be accurately written with a margin in the frequency of the source driver.

The video signal differs depending on whether the video signal uses voltage or current. That is, when the light emitting element emits light, a video signal input to the pixel includes a constant voltage signal and a constant current signal. A video signal having a constant voltage includes a constant voltage applied to the light emitting element and a constant current flowing through the light emitting element. In addition, a video signal having a constant current includes a constant voltage applied to the light emitting element and a constant current flowing in the light emitting element. A constant voltage applied to the light emitting element is called constant voltage driving, and a constant current flowing through the light emitting element is called constant current driving. In constant current driving, a constant current flows regardless of the resistance change of the light emitting element.

The video signal supplied to each pixel portion may be either a voltage video signal or a current video signal, and there are four combinations. The first is to supply a video signal of voltage to both the first pixel portion and the second pixel portion, and the second is to supply a video signal of voltage to the first pixel portion and to the second pixel portion. When supplying a video signal of current, the third supplies a video signal of current to the first pixel portion, and when supplying a video signal of voltage to the second pixel portion, the fourth is the first pixel. This is a case where a video signal of a current is supplied to both the pixel portion and the second pixel portion.

Each pixel portion may use either constant voltage driving or constant current driving, and there are four combinations. First, when both the first pixel unit and the second pixel unit perform constant voltage driving, the second pixel unit performs constant voltage driving, and the second pixel unit performs constant current driving. In the third case, the first pixel unit performs constant current driving, and the second pixel unit performs constant voltage driving. In the fourth case, both the first pixel unit and the second pixel unit are constant. This is a case where current driving is performed.

Each of the first pixel portion and the second pixel portion includes a plurality of pixels, but the number of pixels included in each pixel portion is not necessarily the same, and the number of pixels is changed in each pixel portion. May be. Further, the pixel pitch included in each pixel portion does not need to be the same, and the pixel pitch may be changed in each pixel portion. Further, the display area of each pixel portion does not need to be the same, and the display area may be changed in each pixel portion. In addition, the number of gradations of the image displayed by each pixel unit does not have to be the same, and the number of gradations displayed by each pixel unit may be changed.

The display device of the present invention includes a light-emitting element, and the pixel portion performs color display or monochrome display depending on a material used for an electroluminescent layer included in the light-emitting element, presence or absence of a color filter, and presence or absence of a color conversion layer.

First, when light emitted from the light emitting element is red, green, or blue, the pixel portion performs color display. When light emitted from the light-emitting element is white and a color filter is provided, the pixel portion performs color display. When light emitted from the light-emitting element is white and no color filter is provided, the pixel portion performs monochrome display. When light emitted from the light-emitting element is blue and a color conversion layer is provided, the pixel portion performs color display. When the light emitted from the light emitting element is blue and the color conversion layer is not provided, the pixel portion performs monochrome display. When the light emitting element emits light of one color such as red or green, the pixel portion performs monochrome display.

When the light emitted from the light emitting element is red, green, or blue, it is not necessary to use an optical film, so that the light use efficiency is improved. In addition, when the light emitted from the light emitting element is white or blue, it is not necessary to separately coat the electroluminescent layer, so that the yield is improved. Further, when a color filter or a color conversion layer is provided, color purity and contrast are improved.

The light emitting element may be any of a laminated type in which the electroluminescent layer is composed of a plurality of layers, a single layer type in which the electroluminescent layer is composed of one layer, and a mixed type in which the electroluminescent layer is composed of a plurality of layers but the boundary is not clear Good. The stacked structure of the light emitting element includes a first conductive layer corresponding to the anode from the bottom, an electroluminescent layer on the first conductive layer, and a second conductive layer corresponding to the cathode on the electroluminescent layer. Laminated stacking structure, a first conductive layer corresponding to the cathode from the bottom, an electroluminescent layer on the first conductive layer, and a reverse stacked structure in which the second conductive layer corresponding to the anode is stacked on the electroluminescent layer Although there is a structure, an appropriate structure may be selected in accordance with the conductivity type of the transistor that drives the light-emitting element and the direction of current flowing in the light-emitting element. The electroluminescent layer may be any of an organic material (low molecule, polymer, medium molecule), an inorganic material, a singlet material, a triplet material, or a material combining one or more selected from the above four materials. Good. Light emitted from the light-emitting element includes light emission (fluorescence) when returning from the singlet excited state to the ground state and light emission (phosphorescence) when returning from the triplet excited state to the ground state, and one or both of them are used. . The light emitting element is suitable for displaying moving images because of its wide viewing angle, thinning and lightening by not requiring a backlight, and high response speed. By using a light-emitting element having the above-described advantages, a display device with high functionality and high added value can be provided. This embodiment mode can be freely combined with the above embodiment modes.
(Embodiment 11)

Electronic devices using the display device of the present invention will be described with reference to the drawings. The electronic device includes a housing 800, a housing 805, a housing 806, a panel 801, operation buttons 802, a printed circuit board 803, a printed circuit board 807, a battery 804, a connection film 808, and a connection film 809 (see FIG. 17). The panel 801 has pixel portions on the front and back sides, and each pixel portion is connected to the printed circuit board 807 via a connection film 808 or a connection film 809. A plurality of IC chips are mounted on the printed circuit board 807, and these IC chips include a controller, a central processing circuit, a memory, a power supply circuit, an image processing circuit, an audio processing circuit, a transmission / reception circuit, a time detection circuit, a correction circuit, This corresponds to one or more selected from a temperature detection circuit, an illuminance detection circuit, and the like. The panel 801, the operation buttons 802, the printed circuit boards 803 and 807, the battery 804, and the connection films 808 and 809 are housed in the housings 800, 805, and 806, and each pixel portion included in the panel 801 includes the housings 800 and 806. It arrange | positions so that it can visually recognize from the opening window provided in.

Note that the housings 800, 805, and 806 are examples of the appearance of a mobile phone device, and the electronic device according to this embodiment can be changed into various modes depending on functions and uses. . Therefore, an example of the aspect of the electronic device will be described below with reference to FIGS.

The cellular phone device includes a panel 801, operation buttons 802, printed circuit boards 803 and 807, a battery 804, a housing 806, a display surface 810, a display surface 811, and the like (see FIGS. 18A to 18C). The display surface 810 is used in the opened state (see FIG. 18A), and the display surface 811 is used in the folded state (see FIG. 18C). The present invention can be applied to a display device including the display surface 810 and the display surface 811.

The portable information terminal includes a display surface 9101, a display surface 9102, a button 9103, a rotation shaft 9104, and the like (see FIGS. 18D and 18E). The portable information terminal uses the display surface 9101 in the opened state and uses the display surface 9102 in the folded state. In both the opened state and the folded state, the display surface 9101 and the display surface 9102 can be shared by rotating the housing using the rotation shaft 9104. The present invention can be applied to a display device including the display surface 9101 and the display surface 9102.

The digital video camera includes a display surface 9301, a display surface 9302, a display surface 9303, and the like (see FIGS. 18F and 18G). The present invention can be applied to a display device including a display surface 9301 and a display surface 9303.

The digital camera includes a display surface 9501, a display surface 9502, a lens 9503, and the like (see FIG. 19). The present invention can be applied to a display device including display surfaces 9501 and 9502. The digital camera uses the display surface 9501 in the closed state (see FIG. 19B) and uses one or both of the display surfaces 9501 and 9502 in the opened state (see FIG. 19C). If the same image is displayed on the display surfaces 9501 and 9502 in the opened state, both the person who takes the image and the person who is taking the image can check the taken image at the same time (see FIG. 19C). Alternatively, horizontal reverse display may be performed on the display surface 9501 and normal display may be performed on the display surface 9502 (see FIG. 19D). In this manner, performing horizontal reverse display on the display surface 9501 means that a person to be photographed confirms a mirror image. In other words, the photographed person can confirm his / her mirror image, which is usually confirmed using a mirror, so that he / she can feel reassured, and by using the mirror image, the appearance can be easily adjusted. it can.

The electronic device to which the display device of the present invention is applied is not limited to the above, and as an example, a television device (also called a television device, a television receiver, a television receiver, or a television), a digital camera, a digital video camera, Mobile phone devices (also called mobile phones and mobile phones), personal digital assistants (PDA (Personal Digital Assistant), etc.), portable game machines, monitors, notebook computers, tablet PCs, car audio and other sound reproduction devices, home use Examples thereof include an image reproducing device provided with a recording medium such as a game machine. The display device of the present invention uses a plurality of element substrates provided with a pixel portion including a light-emitting element, and one element substrate among the plurality of element substrates is a sealing substrate of another element substrate. It is also characterized by serving. Rather than providing a sealing substrate corresponding to each of a plurality of element substrates, one element substrate also serves as a sealing substrate for another element substrate, thereby reducing the size, thickness and weight. Realize. In addition, the display device of the present invention includes at least two element substrates provided with light emitting elements, and the element substrates provided with the light emitting elements are arranged so as to face each other. Is provided on both sides. With the above characteristics, high added value can be realized. The display device of the present invention includes two pixel portions, and the two pixel portions share a controller circuit and a power supply circuit. With the above features, it is possible to achieve downsizing, weight reduction, and price reduction. Among electronic devices, portable electronic devices such as a mobile phone device, a portable information terminal, a digital video camera, and a digital camera have a small casing for carrying, and there are restrictions on the volume inside the casing. . Therefore, the effect of reduction in size and thickness provided by the display device of the present invention is a useful effect. This embodiment mode can be freely combined with the above embodiment modes.

Further, a cellular phone device different from the above includes a panel 8010, operation buttons 8020, printed circuit boards 8030 and 8070, a battery 8040, a housing 8060, a display surface 8100, a display surface 8110, and the like (FIGS. 31A to 31C). )reference). The areas of the display surface 8100 and the display surface 8110 are different from each other. The present invention can be applied to a display device including the display surface 8100 and the display surface 8110.

A portable information terminal different from the above includes a display surface 8101, a display surface 8102, a button 8103, a rotation shaft 8104, and the like (see FIGS. 31D and 31E). The areas of the display surface 8101 and the display surface 8102 are different from each other. The present invention can be applied to a display device including the display surface 8101 and the display surface 8102.

Further, a digital video camera different from the above includes a display surface 8301, a display surface 8302, a display surface 8303, and the like (see FIGS. 31F and 31G). The areas of the display surface 8301 and the display surface 8303 are different from each other. The present invention can be applied to a display device including a display surface 8301 and a display surface 8303.

FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 10 is a diagram illustrating a circuit diagram of an active matrix pixel portion. FIG. 10 is a diagram illustrating a circuit diagram of an active matrix pixel portion. FIG. 10 is a diagram illustrating a circuit diagram of an active matrix pixel portion. FIG. 11 is a diagram illustrating a circuit diagram of a passive matrix pixel portion. FIG. 11 illustrates an electronic device using a display device of the present invention. FIG. 11 illustrates an electronic device using a display device of the present invention. FIG. 11 illustrates an electronic device using a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 6 illustrates a display device of the present invention. FIG. 11 illustrates an electronic device using a display device of the present invention.

Claims (3)

A first insulating layer on a first conductive layer electrically connected to the first transistor on one surface, and the first conductive layer in an opening provided in the first insulating layer A first substrate provided with a first light-emitting element comprising a first electroluminescent layer in contact with
A second insulating layer on a second conductive layer electrically connected to the second transistor on one surface, and the second conductive layer in an opening provided in the second insulating layer A second substrate provided with a second light emitting element comprising a second electroluminescent layer in contact with
A sealing resin and a plurality of spacers between the first insulating layer and the second insulating layer disposed to face each other;
The plurality of spacers are formed on one of the first insulating layer and the second insulating layer, and are all sandwiched between the first insulating layer and the second insulating layer,
The first light emitting element emits light in the direction of the first display surface on the other surface side of the first substrate,
The display device, wherein the second light emitting element emits light in a direction of a second display surface on the other surface side of the second substrate. A first conductive layer for connection provided on one surface of the first substrate;
A second connection conductive layer provided on one surface of the second substrate;
The first connection conductive layer and the second connection conductive layer are electrically connected between one surface of the first substrate and the one surface of the second substrate which are arranged to face each other. Including a conductive spacer connected to
In a direction perpendicular to one surface of the first substrate, the resin including the conductive spacer is longer than the plurality of spacers provided between the first insulating layer and the second insulating layer. The display device according to claim 1 , wherein the distance between one surface of the first substrate and one surface of the second substrate is shorter. The display device according to claim 1, further comprising an IC chip provided on one surface of the first substrate or the second substrate by a COG method.

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