Patent Publication Number: US-10319291-B2

Title: Data processing device

Description:
TECHNICAL FIELD 
     The present invention relates to an object, a method, or a manufacturing method. In addition, the present invention relates to a process, a machine, manufacture, or a composition of matter. In particular, the present invention relates to, for example, a human interface, a semiconductor device, a display device, a light-emitting device, a lighting device, a power storage device, a driving method thereof, or a manufacturing method thereof. In particular, the present invention relates to, for example, a method and a program for processing and displaying image data, and a device including a recording medium in which the program is recorded. In particular, the present invention relates to, for example, a method for processing and displaying image data by which an image including data processed by a data processing device provided with a display portion is displayed, a program for displaying an image including data processed by a data processing device provided with a display portion, and a data processing device including a recording medium in which the program is recorded. 
     BACKGROUND ART 
     The social infrastructures relating to means for transmitting information have advanced. This has made it possible to acquire, process, and send out many pieces and various kinds of information with the use of a data processing device not only at home or office but also at other visiting places. 
     With this being the situation, portable data processing devices are under active development. 
     For example, a flexible active matrix light-emitting device in which an organic EL element or a transistor serving as a switching element is provided over a film substrate is disclosed as an example of a portable data processing device (see Patent Document 1). 
     REFERENCE 
     Patent Document 
     
         
         [Patent Document 1] Japanese Published Patent Application No. 2003-174153 
       
    
     DISCLOSURE OF INVENTION 
     Display devices with large screens on which much information can be displayed are excellent in browsability. Therefore, such display devices are suitable for data processing device. 
     On the other hand, the display devices with large screens deteriorate in portability compared to display devices with small screens. Furthermore, the display devices with large screens have higher power consumption than display devices with small screens. 
     Moreover, display quality of the display devices deteriorates in some cases. For example, in the case where light-emitting elements are used in the display device, light-emitting characteristics of the light-emitting elements deteriorate depending on emission intensity or emission times. Therefore, in the case where emission intensity or an emission time is different every pixel, difference of the light-emitting elements in deterioration is observed as display unevenness, resulting in low display quality. 
     In view of the above problem, one object of one embodiment of the present invention is to provide a highly browsable data processing device or the like. Alternatively, another object is to provide a highly portable data processing device or the like. Another object is to provide a data processing device or the like which consumes low power. Another object is to provide a data processing device or the like having high display quality. Another object is to provide a data processing device or the like having less display unevenness. Another object is to provide a novel data processing device or the like. 
     Note that the descriptions of these objects do not disturb the existence of other objects. In one embodiment of the present invention, there is no need to achieve all the objects. Other objects will be apparent from and can be derived from the description of the specification, the drawings, the claims, and the like. 
     One embodiment of the present invention is a data processing device including a display portion having flexibility, a plurality of driver circuit portions arranged in the periphery of the display portion, a sensor portion discerning an external state of the display portion, an arithmetic portion supplying image data to the driver circuit portions, and a memory portion storing a program executed by the arithmetic portion. A first mode in which the display portion is unfolded or a second mode in which the display portion is folded is sensed by the sensor. Luminance adjustment processing is carried out by the program in accordance with the first mode or the second mode. 
     The program stored by the data processing device of one embodiment of the present invention includes a first step of specifying an external mode, a second step in which the program proceeds to a fifth step in the case of the first mode or a third step in the case of a mode other than the first mode, the third step in which the program proceeds to a fourth step in the case of the second mode or the first step in the case of a mode other than the second mode, the fourth step of carrying out luminance adjustment processing, and the fifth step of terminating the program. The luminance adjustment processing includes a sixth step of deciding a display region and a non-display region, a seventh step of stopping driving of at least one of the driver circuit portions, an eighth step of emitting light from part of the non-display region, a ninth step in which the program proceeds to a tenth step in the case where the luminance adjustment processing is canceled or the eighth step in the case where the luminance adjustment processing is not canceled, and the tenth step of recovering from the luminance adjustment processing to the program. 
     In this manner, in the data processing device of one embodiment of the present invention, the luminance adjustment processing is carried out by the program in accordance with the first mode or the second mode, whereby display unevenness of the display portion and power consumption can be suppressed. 
     According to one embodiment of the present invention, a highly browsable data processing device can be provided. Alternatively, a highly portable data processing device can be provided. Further alternatively, a data processing device which consumes low power can be provided. Further still alternatively, a data processing device having high display quality can be provided. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIGS. 1A and 1B  are a block diagram and a top schematic view illustrating a structure of a data processing device. 
         FIGS. 2A and 2B  are a top schematic view and a cross-sectional view illustrating a structure of a data processing device. 
         FIGS. 3A to 3C  are a top schematic view and cross-sectional views illustrating a structure of a data processing device. 
         FIG. 4  is a flow chart showing a program executed by an arithmetic portion of a data processing device. 
         FIG. 5  is a flow chart showing a program executed by an arithmetic portion of a data processing device. 
         FIGS. 6A to 6D  are top schematic views and cross-sectional views each illustrating a structure of a data processing device. 
         FIGS. 7A and 7B  are top schematic views each illustrating a structure of a data processing device. 
         FIGS. 8A and 8B  are diagrams each illustrating a circuit configuration of a pixel. 
         FIGS. 9A and 9B  are diagrams each illustrating a circuit configuration of a display device. 
         FIG. 10  is a diagram illustrating a circuit configuration of a display device. 
         FIGS. 11A and 113  are diagrams each illustrating a circuit configuration of a display device. 
         FIGS. 12A and 12B  are diagrams each illustrating a circuit configuration of a display device. 
         FIGS. 13A and 13B  are diagrams each illustrating a circuit configuration of a display device. 
         FIG. 14  is a diagram illustrating a circuit configuration of a display device. 
         FIGS. 15A and 15B  are diagrams each illustrating a circuit configuration of a display device. 
         FIGS. 16A and 16B  are diagrams each illustrating a circuit configuration of a display device. 
         FIGS. 17A and 17B  are diagrams illustrating a circuit configuration of a display device. 
         FIGS. 18A to 18D  are cross-sectional views each illustrating a structure of a data processing device. 
         FIGS. 19A to 19C  are perspective views illustrating one embodiment of a data processing device. 
         FIGS. 20A and 20B  are a top view and a cross-sectional view illustrating a light-emitting panel that can be used in a data processing device. 
         FIGS. 21A and 21B  are cross-sectional views each illustrating a light-emitting panel that can be used in a data processing device. 
         FIGS. 22A and 2213  are cross-sectional views each illustrating a light-emitting panel that can be used in a data processing device. 
         FIGS. 23A and 23B  are cross-sectional views illustrating a light-emitting panel that can be used in a data processing device. 
         FIGS. 24A to 24C  are cross-sectional views illustrating a manufacturing method of a light-emitting panel that can be used in a data processing device. 
         FIGS. 25A to 25C  are cross-sectional views illustrating a manufacturing method of a light-emitting panel that can be used in a data processing device. 
         FIG. 26  is a cross-sectional view illustrating a light-emitting panel that can be used in a data processing device. 
     
    
    
     BEST MODE FOR CARRYING OUT THE INVENTION 
     A data processing device of one embodiment will be described in detail with reference to drawings. Note that the present invention is not limited to the description below, and it is easily understood by those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. Accordingly, the present invention should not be interpreted as being limited to the content of the embodiments below. Note that in the structures of the invention described below, the same portions or portions having similar functions are denoted by the same reference numerals in different drawings, and description of such portions is not repeated. 
     Note that the layout of blocks in a block diagram in a drawing specifies the positional relation for description. Thus, even when a drawing shows that different functions are achieved in different blocks, an actual circuit or region may be configured so that the different functions are achieved in the same circuit or region. Furthermore, a function of each block in a block diagram in a drawing is specified for description. Thus, even when one block is illustrated, an actual circuit or region may be configured so that processing which is illustrated as being performed in the one block is performed in a plurality of blocks. 
     Embodiment 1 
     In this embodiment, a structure of a data processing device of one embodiment of the present invention will be described with reference to  FIGS. 1A and 1B ,  FIGS. 2A and 2B ,  FIGS. 3A to 3C ,  FIG. 4 ,  FIG. 5 ,  FIGS. 6A to 6D ,  FIGS. 7A and 7B ,  FIGS. 8A and 8B ,  FIGS. 9A and 9B ,  FIG. 10 ,  FIGS. 11A and 11B ,  FIGS. 12A and 12B ,  FIGS. 13A and 13B ,  FIG. 14 ,  FIGS. 15A and 15B ,  FIGS. 16A and 16B ,  FIGS. 17A and 17B , and  FIGS. 18A to 18D . 
       FIG. 1A  is a block diagram illustrating the structure of a data processing device  100  of one embodiment of the present invention. 
     The data processing device  100  shown in  FIG. 1A  includes a display portion  102  having flexibility, a plurality of driver circuit portions  104  arranged in the periphery of the display portion  102 , a sensor portion  106  that discerns the external state of the display portion  102 , an arithmetic portion  108  that supplies image data to the driver circuit portion  104 , and a memory portion  110  that stores a program executed by the arithmetic portion  108 . 
     Moreover, in  FIG. 1A , a display panel  105  is configured by the display portion  102  and the driver circuit portion  104 . Note that the display panel  105  may include only the display portion  102 , or may be a combination of the display portion  102 , the sensor portion  106 , the arithmetic portion  108 , the memory portion  110 , and the like. 
     Note that also the driver circuit portion  104  has flexibility by configuring the display panel  105  by the display portion  102  having flexibility and the driver circuit portion  104  as illustrated in  FIG. 1A . However, the driver circuit portion  104  does not need to have flexibility by being formed over a substrate different from the substrate over which the display panel  105  is formed. 
     Since in the data processing device  100  of one embodiment of the present invention in  FIG. 1A , the external shape of the display portion  102  having flexibility can be changed, a function of having high browsability and a function of having high portability can be compatible with each other. For example, the data processing device  100  is excellent in browsability in the case where the display portion  102  is unfolded and is excellent in portability in the case where the display portion  102  is folded. 
     Here, components in  FIG. 1A  are described below in detail. 
     &lt;Display Portion&gt; 
     The display portion  102  is formed over a substrate capable of changing its external shape, for example, a flexible substrate or a flexible film. 
     &lt;Driver Circuit Portion&gt; 
     The driver circuit portions  104  are arranged in the periphery of the display portion  102 . A signal is supplied from the driver circuit portion  104  to the display portion  102 . The driver circuit portion  104  at least needs to drive the display portion  102 , for example, in the case where pixels are arranged in matrix in the display portion  102 , a circuit (a gate driver) that outputs a signal (a scan signal) for selecting a pixel and a circuit (a source driver) that supplies a signal (a data signal) for driving a display element of the pixel can be used. 
     Part or all of the driver circuit portions  104  are preferably formed over the same substrate in the same step as the display portion  102 . In particular, a gate driver that can be easily formed over the same substrate in the same step as the display portion  102  is preferably provided near a foldable portion. The gate driver has a low operation frequency and is therefore easily formed over the same substrate in the same step as the display portion  102 . Thus, the number of components and the number of terminals can be reduced. Moreover, also part or all of the driver circuit portions  104  can have flexibility because the element formed in the same step as the display portion  102  is used. Therefore, the display portion  102  is foldable at an arbitrary place. Accordingly, the data processing device  100  is hardly broken and can be a durable device. The structure of the driver circuit portion  104  is not limited thereto, and for example, the driver circuit portion  104  is not necessarily formed over the same substrate as the display portion  102 . In that case, part or all of the driver circuit portion  104  can be mounted by a COG method or a TAB method. When the substrate provided with the display portion  102  is folded in the case where the driver circuit portion  104  is mounted by a COG method or a TAB method, it is preferable not to provide an IC, an LSI, or the like provided by a COG method or a TAB method in a folded region. Accordingly, the substrate provided with the display portion  102  is foldable. 
     Note that the driver circuit portion  104  may have a function as a protective circuit, a control circuit, a power supply circuit, a signal generation circuit, or the like. 
     The driver circuit portion  104  may include a plurality of power supply circuits and further the plurality of power supply circuits may be independently controlled such that the display portion  102  is driven in a divisional manner. Alternatively, the driver circuit portion  104  may be configured such that supply of power supply voltage to each of the divided portions of the display portion  102  can be controlled. In addition, a circuit having a function of monitoring the amount of current flowing through a light-emitting element provided in the display portion  102  may be provided in part of the power supply circuit or apart from the power supply circuit. By monitoring the amount of current flowing through the light-emitting element, power consumption in the display portion  102  can be measured. As an example of the amount of the current which is monitored, the amount of current between an anode and a cathode of the light-emitting element provided in the display portion  102  may be monitored. 
     &lt;Arithmetic Portion&gt; 
     The arithmetic portion  108  has a function of supplying image data to the driver circuit portion  104 . 
     &lt;Sensor Portion&gt; 
     The sensor portion  106  has a function capable of discerning the external state of the display portion  102 . For example, a first mode in which the display portion  102  is unfolded or a second mode in which the display portion  102  is folded can be sensed. The sensor portion  106  at least needs to discern the external state of the display portion  102  and can be composed of, for example, a switch, a MEMS pressure sensor, an acceleration sensor, an infrared ray sensor, a magnetic sensor, or a pressure-sensitive sensor. 
     &lt;Memory Portion&gt; 
     The memory portion  110  stores a program executed by the arithmetic portion  108 . The program makes the arithmetic portion  108  execute different processing depending on the data from the sensor portion  106 . 
     Next, a specific structure of the display panel  105  illustrated in  FIG. 1A  is described below 
       FIG. 1B  is a top schematic view illustrating a structure of the display panel  105 . 
     The display panel  105  in  FIG. 1B  can be folded along dashed lines α 1 -α 2  and β 1 -β 2 . Note that in the case of the structure in  FIG. 1B , the display panel  105  can be folded into three parts. However, the structure of the display panel  105  is not limited thereto and the display panel  105  may be folded along one place or three or more places. Note that the dashed lines α 1 -α 2  and β 1 -β 2 , which are the folds, are placed parallel to each other: however, one embodiment of the present invention is not limited thereto. The folds are not necessarily parallel to each other or may cross to each other. 
     The display panel  105  in  FIG. 1B  includes the display portion  102  and the driver circuit portion  104  in the periphery of the display portion  102 . The driver circuit portion  104  includes a first gate driver  104   g _ 1 , a second gate driver  104   g _ 2 , a first source driver  104   s _ 1 , and a second source driver  104   s _ 2 . Note that the first gate driver  104   g _ 1 , the first source driver  104   s _ 1 , and the second source driver  104   s _ 2  are independently formed in unfolded regions. 
     Although the second gate driver  104   g _ 2  is at this time laid across a folded region, it can be operated without a problem by being formed over the same substrate in the same step as the display portion  102 . However, one embodiment of the present invention is not limited thereto and as shown in  FIG. 7A , for example, gate drivers (gate drivers  104   g _ 1 A and  104   g _ 1 B, gate drivers  104   g _ 2 A and  104   g _ 2 B, gate drivers  104   g _ 2 C and  104   g _ 2 D, and the like) may be arranged on both the sides of the display portion  102  or only one source driver may be provided. Alternatively, source drivers may be arranged at the position of the gate drivers in  FIG. 1B  and gate drivers may be arranged at the position of the source drivers in  FIG. 1B . Further alternatively, without disposing the second gate drivers  104   g _ 2  in the folded region, a circuit may be avoided being provided at a fold in a manner similar to that of the gate divers  104   g _ 2 A and  104   g _ 2 C or the gate drivers  104   g _ 2 B and  104   g _ 2 D in  FIG. 7A . Accordingly, reliability of the display panel can be improved. Further still alternatively, the gate drivers can be mounted by a COG method or a TAB method. 
     As shown in  FIG. 7B , gate drivers and source drivers may be arranged on the same side. In  FIG. 7B , a first gate driver  104   g _ 3 , a second gate driver  104   g _ 4 , a first source driver  104   s _ 3 , and a second source driver  104   s _ 4  are arranged on one side. The first gate driver  104   g _ 3  and the second gate driver  104   g _ 4  are connected to each other through wirings which are arranged so as to surround the periphery of the display portion  102 . With such a disposal, the position at which the display portion  102  is folded can be freely changed. Moreover, the driver circuits are not folded; therefore, no pressure is applied to a transistor. Accordingly, reliability of the display panel can be improved. Note that in  FIG. 79 , the gate drivers are arranged on the source driver side to largely detour wirings connected to gate lines; however, one embodiment of the present invention is not limited thereto. Alternatively, source drivers may be arranged on the gate driver sides to largely detour wirings connected to source lines. 
     Next, the display state in which the display portion  102  of the display panel  105  in  FIG. 19  is unfolded (first mode) is described with reference to  FIGS. 2A and 29 . 
       FIG. 2A  is a top schematic view in the case where the display portion  102  of the display panel  105  is unfolded (first mode), and  FIG. 2B  is a cross-sectional view taken along dashed-dotted line A-B in  FIG. 2A . 
     In the case of the display portion  102  in  FIGS. 2A and 2B , an image can be displayed on the entire display portion  102  with the use of the first gate driver  104   g _ 1 , the second gate driver  104   g _ 2 , the first source driver  104   s _ 1 , and the second source driver  104   s _ 2 . 
     Next, the display state in which the display portion  102  of the display panel  105  in  FIG. 1B  is folded (second mode) is described with reference to  FIGS. 3A to 3C . 
       FIG. 3A  is a top schematic view in the case where the display portion  102  is folded (second mode), and  FIG. 3B  is a cross-sectional view taken along dashed-dotted line A-B in  FIG. 3A . Note that  FIG. 3C  is a cross-sectional view of the display panel  105  in a display state different from that in  FIG. 3B . 
     In the case of the display portion  102  in  FIG. 3A , an image can be displayed on the entire display portion  102  with the use of the first gate driver  104   g _ 1 , the second gate driver  104   g _ 2 , the first source driver  104   s _ 1 , and the second source driver  104   s _ 2  as shown in  FIG. 3B . However, a region  120  positioned at a folded place cannot be directly seen by viewers. Therefore, as shown in  FIG. 3C , power consumption of the display portion  102  can be reduced in such a manner that the display portion  102  is divided into a display portion  102   a  and a display portion  102   b  and only an image on the display portion  102   a  which can be seen by viewers are displayed and an image on the display portion  102   b  which cannot be seen by the viewers is not displayed. 
     A variety of methods can be employed not to thus display the image on the display portion  102   b . For example, a black image having minimum luminance or gray scale is displayed on pixels of the display portion  102   b . That is, the black image is displayed by controlling video signals supplied to the display portion  102   b . Accordingly, light is not emitted from the display portion  102   b , which substantially corresponds to the state in which an image is not displayed. 
     Furthermore, another method can also be employed. In such a case, the method differs depending on the circuit configuration of a pixel. Alternatively, the method differs depending on the place where source drivers and gate drivers are arranged. 
     First, examples of a pixel circuit are illustrated in  FIGS. 8A and 8B . Note that although an active-matrix pixel including transistors is shown in  FIGS. 8A and 8B , one embodiment of the present invention is not limited thereto. A passive-matrix pixel without a transistor or the like may be employed. Alternatively, a lighting device in which pixels are not arranged and light is emitted from the entire surface may be employed. 
     A pixel  909  includes a transistor  901 , a transistor  903 , a capacitor  902 , and a light-emitting element  904 . Pixels are electrically connected to each other through wirings  906 ,  905 ,  907 , and  908 . 
     The wiring  906  has a function capable of supplying a video signal, an initialization signal, a precharge signal, or the like. Thus, the wiring  906  has a function as a source signal line, a video signal line, or the like. The wiring  905  has a function capable of supplying a selection signal or the like. Thus, the wiring  905  has a function as a gate signal line or the like. The wiring  907  has a function of supplying current to the light-emitting element  904  or the transistor  903  or a function of supplying a signal for correcting the current of the transistor  903 . Thus, the wiring  907  has a function as an anode line, a current supply line, a power supply line, a voltage supply line, or the like. The wiring  908  has a function as a cathode line, a common electrode, or the like. 
     The transistor  901  has a function capable of controlling whether to supply a video signal, an initialization signal, or the like or not, whether to select a pixel or not, or the like. Thus, the transistor  901  has a function as a selection transistor. The capacitor  902  has a function capable of holding a video signal, a threshold voltage of the transistor, or the like. The transistor  903  has a function capable of controlling the amount of current flowing through the light-emitting element  904 . The transistor  903  can control the amount of the current in accordance with voltage held in the capacitor  902 . Thus, the transistor  903  has a function as a driving transistor. Accordingly, it is preferable that the transistor  903  be a p-channel transistor in  FIG. 8A  and an n-channel transistor in  FIG. 8B . Note that one embodiment of the present invention is not limited thereto. 
     Note that the pixel circuit can have a variety of configurations. Therefore, one embodiment of the present invention is not limited to the configuration in  FIGS. 8A and 8B . 
     In  FIGS. 9A and 9B , the pixel circuits in  FIG. 8A  are arranged in a matrix.  FIG. 9A  shows the case where folds are provided parallel to the wirings  907 , and  FIG. 9B  shows the case where folds are provided parallel to the wirings  905 . 
       FIG. 10  is a block diagram in the case of  FIG. 9A  where a circuit  911  that controls conducting states of the wirings  907  is provided. The wirings  906  are electrically connected to a source driver circuit  912 . The wirings  907  are electrically connected to the circuit  911 . To which wiring of the plurality of wirings  907  voltage is supplied and to which wiring thereof voltage is not supplied can be controlled by the circuit  911 . Accordingly, a non-light-emitting region can be formed when the display panel  105  is folded; thus, power consumption can be reduced. 
       FIGS. 11A and 11B  illustrate examples of the circuit configuration inside the circuit  911 . In  FIG. 11A , a wiring  918 A and a wiring  918 B are used in a left-side region and a right-side region of dashed line α 1 -α 2  which denotes a first fold, respectively. The left-side region and the right-side region of the dashed line α 1 -α 2  which denotes the first fold are a display region and a non-display region, respectively, when the display panel  105  is folded. Here, wirings  907 A,  907 B, and the like are connected to the wiring  918 A, and wirings  907 C,  907 D,  907 E,  907 F, and the like are connected to the wiring  918 B. With such a configuration, current is supplied to the transistor  903  and the light-emitting element  904  in each pixel through the wirings  907 A,  907 B, and the like by supply of voltage to the wiring  918 A when the display panel  105  is folded. Accordingly, light emission can be obtained. In contrast, current is not supplied to the transistor  903  and the light-emitting element  904  in each pixel in such a manner that voltage is not supplied to the wiring  918 B, which becomes a floating state, or a voltage is supplied such that the light-emitting element  904  does not emit light. 
     Note that although, in  FIG. 11A , the transistor  903  and the light-emitting element  904  in each pixel are separately connected to the wiring  918 A and the wiring  918 B at the boundary of the dashed line α 1 -α 2  which denotes the first fold, one embodiment of the present invention is not limited thereto. As shown in  FIG. 11B , the wiring  9070  may be connected to the wiring  918 A so that also the right-side region of the dashed line α 1 -α 2  which denotes the first fold emits light when the display panel  105  is folded. 
     Note that the source driver circuit  912  and the circuit  911  may be divided into a plurality of IC chips so that they can be mounted by a COG method or a TAB method in such a manner that the IC chips are not arranged in a region overlapping with the folds. 
     Note that although, in  FIGS. 11A and 11B , a light-emitting region and a non-light-emitting region when the display panel  105  is folded can be controlled with the wiring  918 A and the wiring  918 B, respectively, one embodiment of the present invention is not limited thereto. Light emission may be controlled by combining the wiring  918 A and the wiring  918 B into one wiring and arranging switches. In  FIG. 12A , the wirings  907 A,  907 B, and the like in the left-side region of the dashed line α 1 -α 2  which denotes the first fold are connected to the wiring  918  without through a switch. Therefore, light can be emitted regardless of whether the display panel  105  is folded or not. In contrast, the wirings  907 C,  907 D,  907 E,  907 F and the like in the right-side region of the dashed line α 1 -α 2  which denotes the first fold are connected to the wiring  918  through switches  917 C,  917 D,  917 E,  917 F, and the like, respectively. Therefore, the pixels in the right-side region thereof can be controlled to emit no light by turning off these switches when the display panel  105  is folded. 
     Note that in the case where a resistance value changes in some regions due to whether switches are provided or not, the wirings  907 A,  907 B, and the like in the left-side region of the dashed line α 1 -α 2  which denotes the first fold may be connected to the wiring  918  through switches  917 A,  917 B, and the like as shown in  FIG. 12B . 
     Next, in the case of  FIG. 9B , a circuit configuration in which light emission can be controlled in some regions is shown in  FIG. 13A . As shown in  FIG. 13A , a gate driver  913 B is connected to the transistor  903  and the light-emitting element  904  in each pixel in a lower region of dashed line α 1 -α 2  which denotes a first fold, whereas a gate driver  913 A is connected to the transistor  903  and the light-emitting element  904  in each pixel in an upper region of the dashed line α 1 -α 2  which denotes the first fold. In the lower region of the dashed line α 1 -α 2  which denotes the first fold, the gate driver  913 B operates so that light is emitted even when the display panel  105  is folded, whereas in the upper region thereof, the gate driver  913 A operates so as not to select a pixel so that light is not emitted when the display panel  105  is folded. For example, the gate driver  913 A outputs an L signal, whereby the gate driver  913 A does not substantially carry out scan operation. Accordingly, power consumption can be reduced. Note that  FIG. 3C  corresponds to the case of  FIG. 13A . 
     In the case of the display portion  102  shown in  FIG. 3C , only the display portion  102   a  can be displayed in such a manner that, for example, the first gate driver  104   g _ 1 , the first source driver  104   s _ 1 , and the second source driver  104   s _ 2  are used and a selection signal is not output (e.g., only an L signal is output) from the second gate driver  104   g _ 2  so as not to substantially carry out scan operation. 
     Note that as shown in  FIG. 13B , whether a selection signal is output or not may be controlled by providing a circuit  915  in an output portion of a gate driver  914 ,  FIG. 14  illustrates an example of the circuit  915 . An output of the gate driver  914  is controlled by an AND circuit  919  by setting the potential of a wiring  920  to an H signal and thus output to the wiring  905 . On the other hand, an L signal is always supplied to the wiring  905  by setting the potential of the wiring  920  to an L signal. Accordingly, supply of a selection signal to a pixel can be stopped; thus, power consumption can be reduced. 
     Note that the gate driver  914 , the circuit  915 , the gate driver  913 A, and the like may be divided into a plurality of IC chips so that they can be mounted by a COG method or a TAB method in such a manner that the IC chips are not arranged in a region overlapping with the folds. 
     Next, in  FIGS. 15A and 15B , the pixel circuits in  FIG. 8B  are arranged in a matrix.  FIG. 15A  shows the case where folds are provided parallel to the wirings  906 , and  FIG. 15B  shows the case where folds are provided parallel to the wirings  905 . 
     In  FIGS. 16A and 16B  as well as in  FIG. 13A , different driver circuits are arranged in accordance with regions. Note that there are a case where a circuit for driving the wiring  905  is provided and a case where a circuit for driving the wiring  907  is provided. In  FIG. 16A , a circuit  916 A and a circuit  916 B are provided as the circuits for driving the wiring  907 . In contrast, in  FIG. 16B , a circuit  913  for driving the wiring  905  is provided without being divided in accordance with regions. In other words, the circuit for driving the wiring  905  and the circuit for driving the wiring  907  can be divided or not every region. 
       FIG. 17A  illustrates an example where a circuit  921  is provided in an output portion of a circuit  916  in a manner similar to that of the circuit  915  in  FIG. 13B .  FIG. 17B  illustrates a specific example of the circuit  921 . The potential of the wiring  907  is controlled by an AND circuit  922  by controlling the potential of a wiring  923 . 
     In this manner, a light-emitting state can be controlled in accordance with regions by a variety of methods. 
     However, when the driver circuit portion  104  is driven in a structure where an image is displayed only in the display portion  102   a  as in the display portion  102  in  FIG. 3C  and then an image is displayed in the entire display portion  102  in a state where the display portion  102  of the display panel  105  in  FIGS. 2A and 2B  is unfolded (first mode), a phenomenon arises in which, in  FIG. 3C , luminance of the display portion  102   a  is different from luminance of the display portion  102   b.    
     For example, with a structure in which an image is displayed only in the display portion  102   a  in the case where a light-emitting element is used in the display portion  102 , the light-emitting element in the display portion  102   a  might deteriorate. Therefore, in the first mode in which the display portion  102  is unfolded, luminance or the like varies in the plane of the display portion  102  and such variation is recognized as display unevenness. In particular, a change in luminance becomes noticeable at a boundary between the display portion  102   a  and the display portion  102   b ; therefore, the boundary between the display portion  102   a  and the display portion  102   b  is recognized by viewers. 
     Thus, in the data processing device  100  of one embodiment of the present invention, display unevenness of the display portion  102 , in particular, a luminance difference between the display portion  102   a  and the display portion  102   b , can be reduced in such a manner that a program carries out luminance adjustment processing in accordance with the first mode in which the display portion  102  is unfolded or the second mode in which the display portion  102  is folded to control a driving method. Therefore, a data processing device having high display quality can be provided. 
     Here, the above program and driving method are described with reference to  FIG. 4  and  FIG. 5 . 
     &lt;Program&gt; 
       FIG. 4  is a flow chart of a program of the memory portion  110  included in the data processing device  100  in  FIG. 1A . 
     In a first step, the external state of the display portion  102  is specified by data from the sensor portion  106  (Step S 1 ). 
     In a second step, whether the display portion  102  is in the unfolded mode (first mode) or not is judged (Step S 2 ). The program proceeds to a fifth step in the case of the first mode or a third step in the case of a mode other than the first mode. 
     In the third step, whether the display portion  102  is in the folded mode (second mode) or not is judged (Step S 3 ). The program proceeds to a fourth step in the case of the second mode or the first step (Step S 1 ) in the case of a mode other than the second mode. 
     In the fourth step, luminance adjustment processing is carried out (Step S 4 ). 
     In the fifth step, the program is terminated (Step S 5 ), 
     Here, as for the luminance adjustment processing in the fourth step (Step S 4 ), the description is made with reference to flow charts shown in  FIG. 5 . 
     &lt;Luminance Adjustment Processing&gt; 
     In a sixth step, a display region and a non-display region are decided (Step V 6 ). In particular, the non-display region is preferably decided to be a region starting from a boundary with the display region which can be recognized by viewers. 
     In a seventh step, for example, at least one driver circuit portion is stopped (Step V 7 ). Note that as already described above, a variety of methods which control a variety of non-light-emitting regions can be alternatively employed. 
     In the mode in which the display portion  102  is folded (second mode), an image in a region which is not seen by viewers can be made not to be displayed by stopping at least one driver circuit portion; thus, a data processing device  100  having low power consumption can be obtained. 
     In an eighth step, light is emitted from part of the non-display region (Step V 8 ). 
     In a ninth step, whether the luminance adjustment processing is canceled or not is judged (Step V 9 ). The program proceeds to a tenth step in the case where the luminance adjustment processing is canceled or the eighth step in the case where the luminance adjustment processing is not canceled. 
     The tenth step recovers from the luminance adjustment processing to the program (Step V 10 ). 
     Here, a specific method of the above luminance adjustment processing is described with reference to  FIGS. 6A to 6D . 
       FIGS. 6A and 6C  are each a top schematic view illustrating a structure of the display panel  105 .  FIG. 6B  is a cross-sectional view taken along dashed-dotted line A-B in  FIG. 6A , and  FIG. 6D  is a cross-sectional view taken along dashed-dotted line A-B in  FIG. 6B . 
     Note that  FIGS. 6A and 6B  are a top schematic view and a cross-sectional view, respectively, of the anode where the display portion  102  is unfolded (first mode), whereas  FIGS. 6C and 6D  are a top schematic view and a cross-sectional view, respectively, of the mode where the display portion  102  of the display panel  105  in  FIGS. 6A and 6B  is folded (second mode). 
     The display panel  105  in  FIG. 6A  as well as the display panel  105  in  FIG. 1B  can be folded along dashed lines α 1 -α 2  and β 1 -β 2 . 
     The display panel  105  in  FIGS. 6A to 6D  includes the display portion  102  and the driver circuit portion  104  in the periphery of the display portion  102 . The driver circuit portion  104  includes the first gate driver  104   g _ 1 , the second gate driver  104   g _ 2 , the first source driver  104   s _ 1 , and the second source driver  104   s _ 2 . Note that the first gate driver  104   g _ 1 , the first source driver  104   s _ 1 , and the second source driver  104   s _ 2  are independently formed in unfolded regions. 
     In  FIG. 6D , in a manner similar to that of the display portion  102  in  FIG. 3C , the display portion  102  is divided into the display portion  102   a  and the display portion  102   b  and only an image on the display portion  102   a  which can be seen by viewers are displayed and an image on the display portion  102   b  which cannot be seen by the viewers is not displayed. 
     Moreover, in the display portion  102   b  in  FIG. 6D , a light-emitting region  130  including a first light-emitting region  131 , a second light-emitting region  132 , and a third light-emitting region  133  is formed starting from a boundary with the display portion  102   a.    
     Light is emitted from the light-emitting region  130  in the eighth step (Step V 8 ) executed by the above program. 
     In the light-emitting region  130 , the relation in which luminance of the first light-emitting region  131  is higher than that of the second light-emitting region  132  which is higher than that of the third light-emitting region is satisfied. This can be achieved by controlling a video signal supplied to a pixel in each region. 
     Luminance at the boundary between the display portion  102   a  and the display portion  102   b  changes gradually by providing a light-emitting region whose luminance changes stepwise from luminance of the display portion  102   a . For example, when light is emitted only from the display portion  102   a  in the case where a light-emitting element is used in the display portion  102 , only a region of the light-emitting element in the display portion  102   a  deteriorates. However, deterioration of the light-emitting element in the range of the display portion  102   a  to the display portion  102   b  is reduced by providing a light-emitting region whose luminance changes stepwise from luminance of the display portion  102   a . Therefore, viewers cannot recognize the boundary between the display portion  102   a  and the display portion  102   b ; accordingly, a data processing device having high display quality can be provided. 
     Note that  FIGS. 6A and 6B  are illustrated for easy understanding, and light may be emitted from the light-emitting region  130  in the mode where the display portion  102  in  FIGS. 6C and 6D  is folded (second mode). 
     Therefore, for example, the light-emitting region  130  is possibly considered to be included not in a region of the display portion  102   b  but in a region of the display portion  102   a , For example, as illustrated in  FIG. 18A  corresponding to  FIG. 6D , the display portion  102   a  may extend to be provided on the side surface portion, in which case the first light-emitting region  131 , the second light-emitting region  132 , and the third light-emitting region  133  are completely covered. Accordingly, a visible region is recognized to have normal luminance; therefore, appropriate display can be performed. Alternatively, as illustrated in  FIG. 18B , the display portion  102   a  may be limited to a flat region and the first light-emitting region  131 , the second light-emitting region  132 , and the third light-emitting region  133  may be provided on a curved portion. Since the curved portion seems to strain, such a portion is not appropriate for accurate display. Thus, by displaying the region with gradation, the influence of deterioration can be made less visible. 
     Alternatively, the states like those in  FIG. 18B ,  FIG. 6D , and  FIG. 18A  may be switched every predetermined period. Further alternatively, the boundary may be changed gradually from the state in  FIG. 18B  to the state in  FIG. 6B  and further to the state in  FIG. 18A  and after that, similarly, the boundary may be returned to the state in  FIG. 18B  through the state in  FIG. 6D . By thus changing the light-emitting region, the influence of deterioration can be made much less visible. 
     Further still alternatively, an initial point of a light-emitting region in the display portion  102   b  may be changed or the position or luminance of the light-emitting region in the display portion  102   b  may be changed. For example, in the case where the display portion  102  is folded several times, at a first fold, light is emitted only from the first light-emitting region  131 . At a second fold, light is emitted from the first light-emitting region  131  and the second light-emitting region  132 . At a third fold, light is emitted from the first light-emitting region  131  by changing its initial point. Such a light-emitting pattern is an effective driving method to reduce a luminance difference at the boundary between the display portion  102   a  and the display portion  102   b.    
     Although, in  FIGS. 6A, 6B, and 6D , the light-emitting region  130  includes the first light-emitting region  131 , the second light-emitting region  132 , and the third light-emitting region  133 , one embodiment of the present invention is not limited to such a structure. 
     For example, the light-emitting region  130  does not necessarily include the first light-emitting region  131 , the second light-emitting region  132 , and the third light-emitting region  133 . In such a case, the states like those in  FIG. 18C ,  FIGS. 3C, and 18D  may be switched every predetermined period. Alternatively, the boundary may be changed gradually from the state in  FIG. 18C  to the state in  FIG. 3C  and further to the state in  FIG. 18D  and after that, similarly, the boundary may be returned to the state in  FIG. 18C  through the state in  FIG. 3C . By thus changing the light-emitting region, the influence of deterioration can be made much less visible. 
     Further alternatively, another program in which light is emitted from the light-emitting region  130  only when the data processing device  150  is charged may be executed. 
     The light-emitting region  130  may be independently controlled with a circuit different from those in the driver circuit portions  104 . For example, since it is not necessary to display an image in the light-emitting region  130 , a light-emitting element in the light-emitting region  130  is configured such that an anode and a cathode thereof is short-circuited. In this case, light-emitting elements provided in the display portion  102  may be driven by the driver circuit portion  104 . 
     Furthermore, luminance in each of the first light-emitting region  131 , the second light-emitting region  132 , and the third light-emitting region  133  of the light-emitting region  130  is set in such a manner that current flowing through the display portion  102   a  is measured by a current monitor circuit and a current value of the current monitor circuit is read. 
     This embodiment can be combined as appropriate with any of the other embodiments in this specification. 
     Embodiment 2 
     In this embodiment, an example of a data processing device of one embodiment of the present invention will be described with reference to  FIGS. 19A to 19C . 
       FIG. 19A  illustrates a data processing device  150  in a mode in which a display portion is unfolded (a first mode).  FIG. 19B  illustrates the data processing device  150  in the middle of changing from either the mode in which the display portion is unfolded (first mode) or a mode in which the display portion is folded (a second mode) to the other mode.  FIG. 19C  illustrates the data processing device  150  in the mode in which the display portion is folded (second mode). 
     The data processing device  150  in  FIGS. 19A to 19C  includes a display panel  152  including a display portion having flexibility. The data processing device  150  further includes a plurality of support panels  153   a , a plurality of support panels  155   a , and a plurality of support panels  155   b.    
     The support panel  153   a , is formed with, for example, a material having lower flexibility than a material of the display panel  152 , and the support panels  155   a  and  155   b  are each formed with, for example, a material having lower flexibility than a material of the support panel  153   a . As illustrated in  FIGS. 19A to 19C . When the support panels are arranged in the periphery of the display panel  152  and on the surface opposite to the display portion of the display panel  152 , the display panel  152  has high mechanical strength and is less likely to be broken. 
     Moreover, when the support panels  153   a ,  155   a , and  155   b  are preferably formed with a material having a light-blocking property, irradiation of driver circuit portions of the display panel  152  with external light can be suppressed. Accordingly, light deterioration of transistors and the like used in the driver circuit portions can be suppressed. 
     Although not illustrated in  FIGS. 19A to 19C , an arithmetic portion, a memory portion, a sensor portion, and the like of the data processing device  150  can be arranged between the display panel  152  and the support panels  155   b.    
     The support panels  153   a ,  155   a , and  155   b  can be formed using plastic, a metal, an alloy, rubber, or the like as a material. Plastic, rubber, or the like is preferably used because it can form a support panel that is lightweight and less likely to be broken. For example, silicone rubber, stainless steel, or aluminum may be used as the support panels  153   a ,  155   a , and  155   b.    
     Furthermore, the display panel  152  including the display portion having flexibility in the data processing device  150  can be folded either inward or outward. When the data processing device  150  is not used, the display panel  152  is folded to have the display portion facing inside, whereby scratches and stains on the display portion can be suppressed. 
     This embodiment can be combined as appropriate with any of the other embodiments in this specification. 
     Embodiment 3 
     In this embodiment, a light-emitting panel that can be used in the data processing device of one embodiment of the present invention will be described with reference to  FIGS. 20A and 20B ,  FIGS. 21A and 21B ,  FIGS. 22A and 22B ,  FIGS. 23A and 23B ,  FIGS. 24A to 24C , and  FIGS. 25A to 25C . 
     Specific Example 1 
       FIG. 20A  is a top view of a light-emitting panel, and  FIG. 2013  is an example of a cross-sectional view taken along dashed-dotted line A 1 -A 2  in  FIG. 20A . 
     The light-emitting panel illustrated in  FIG. 20B  includes an element layer  180 , a bonding layer  185 , and a substrate  181 . The element layer  180  includes a substrate  201 , a bonding layer  203 , an insulating layer  205 , a plurality of transistors, a conductive layer  254 , an insulating layer  207 , an insulating layer  209 , a plurality of light-emitting elements, an insulating layer  211 , a sealing layer  213 , an insulating layer  261 , a coloring layer  259 , a light-blocking layer  257 , and an insulating layer  255 . 
     The conductive layer  254  is electrically connected to an FPC  186  via a connector  215 . 
     A light-emitting element  230  includes a lower electrode  231 , an EL layer  233 , and an upper electrode  235 . The lower electrode  231  is electrically connected to a source electrode or a drain electrode of a transistor  240 . An end portion of the lower electrode  231  is covered with the insulating layer  211 . The light-emitting element  230  has a top emission structure. The upper electrode  235  has a light-transmitting property and transmits light emitted from the EL layer  233 . 
     The coloring layer  259  is provided to overlap with the light-emitting element  230 , and the light-blocking layer  257  is provided to overlap with the insulating layer  211 . The coloring layer  259  and the light-blocking layer  257  are covered with the insulating layer  261 . The space between the light-emitting element  230  and the insulating layer  261  is filled with the sealing layer  213 . 
     The light-emitting panel includes a plurality of transistors in a light extraction portion  182  and a driver circuit portion  184 . The transistor  240  is provided over the insulating layer  205 . The insulating layer  205  and the substrate  201  are attached to each other with the bonding layer  203 . The insulating layer  255  and the substrate  181  are attached to each other with the bonding layer  185 . It is preferable to use films with low water permeability for the insulating layer  205  and the insulating layer  255 , in which case an impurity such as water can be prevented from entering the light-emitting element  230  or the transistor  240 , leading to improved reliability of the light-emitting panel. The bonding layer  203  can be formed using a material similar to that of the bonding layer  185 . 
     The light-emitting panel in Specific Example 1 can be manufactured in the following manner: the insulating layer  205 , the transistor  240 , and the light-emitting element  230  are formed over a formation substrate with high heat resistance; the formation substrate is separated; and the insulating layer  205 , the transistor  240 , and the light-emitting element  230  are transferred to the substrate  201  and attached thereto with the bonding layer  203 . The light-emitting panel in Specific Example 1 can be manufactured in the following manner: the insulating layer  255 , the coloring layer  259 , and the light-blocking layer  257  are formed over a formation substrate with high heat resistance; the formation substrate is separated; and the insulating layer  255 , the coloring layer  259 , and the light-blocking layer  257  are transferred to the substrate  181  and attached thereto with the bonding layer  185 . 
     In the case where a material with high water permeability and low heat resistance (e.g., resin) is used for a substrate, it is impossible to expose the substrate to high temperature in the manufacturing process. Thus, there is a limitation on conditions for forming a transistor and an insulating film over the substrate. In the manufacturing method of this embodiment, a transistor and the like can be formed over a formation substrate with high heat resistance; thus, a highly reliable transistor and an insulating film with sufficiently low water permeability can be formed. Then, the transistor and the insulating film are transferred to the substrate  181  and the substrate  201 , whereby a highly reliable light-emitting panel can be manufactured. Thus, with one embodiment of the present invention, a thin or/and lightweight data processing device with high reliability can be provided. 
     The substrate  181  and the substrate  201  are each preferably formed using a material with high toughness. In that case, a display device with high impact resistance that is less likely to be broken can be provided. For example, when the substrate  181  is an organic resin substrate and the substrate  201  is a substrate formed using a thin metal material or a thin alloy material, the light-emitting panel can be more lightweight and less likely to be broken as compared to the case where a glass substrate is used. 
     A metal material and an alloy material, which have high thermal conductivity, are preferable because they can easily conduct heat to the whole substrate and accordingly can prevent a local temperature rise in the light-emitting panel. The thickness of a substrate using a metal material or an alloy material is preferably greater than or equal to 10 μm and less than or equal to 200 μm, further preferably greater than or equal to 20 μm and less than or equal to 50 μm. 
     Furthermore, when a material with high thermal emissivity is used for the substrate  201 , the surface temperature of the light-emitting panel can be prevented from rising, leading to prevention of breakage or a decrease in reliability of the light-emitting panel. For example, the substrate  201  may have a stacked-layer structure of a metal substrate and a layer with high thermal emissivity (e.g., the layer can be formed using a metal oxide or a ceramic material). 
     Specific Example 2 
       FIG. 21A  illustrates another example of the light extraction portion  182  in the light-emitting panel. The light-emitting panel in  FIG. 21A  is capable of touch operation. In the following specific examples, description of components similar to those in Specific Example 1 is omitted. 
     The light-emitting panel illustrated in  FIG. 21A  includes the element layer  180 , the bonding layer  185 , and the substrate  181 . The element layer  180  includes the substrate  201 , the bonding layer  203 , the insulating layer  205 , the plurality of transistors, the insulating layer  207 , the insulating layer  209 , a plurality of light-emitting elements, the insulating layer  211 , an insulating layer  217 , the sealing layer  213 , the insulating layer  261 , the coloring layer  259 , the light-blocking layer  257 , a plurality of light-receiving elements, a conductive layer  281 , a conductive layer  283 , an insulating layer  291 , an insulating layer  293 , an insulating layer  295 , and the insulating layer  255 . 
     Specific Example 2 includes the insulating layer  217  over the insulating layer  211 . The space between the substrate  181  and the substrate  201  can be adjusted with the insulating layer  217 . 
       FIG. 21A  illustrates an example in which a light-receiving element is provided between the insulating layer  255  and the sealing layer  213 . Since the light-receiving element can be placed to overlap with a non-light-emitting region (e.g., a region where the transistor  240  or a wiring is provided) on the substrate  201  side, the light-emitting panel can be provided with a touch sensor without a decrease in the aperture ratio of a pixel (light-emitting element). 
     As the light-receiving element included in the light-emitting panel, for example, a p-n photodiode or a p-i-n photodiode can be used. In this embodiment, a p-i-n photodiode including a p-type semiconductor layer  271 , an i-type semiconductor layer  273 , and an n-type semiconductor layer  275  is used as the light-receiving element. 
     Note that the i-type semiconductor layer  273  is a semiconductor in which the concentration of each of an impurity imparting p-type conductivity and an impurity imparting n-type conductivity is 1×10 20  cm −3  or less and which has photoconductivity  100  times or more as high as dark conductivity. The i-type semiconductor layer  273  also includes, in its category, a semiconductor that contains an impurity element belonging to Group 13 or Group 15 of the periodic table. In other words, since an i-type semiconductor has weak n-type electric conductivity when an impurity element for controlling valence electrons is not added intentionally, the i-type semiconductor layer  273  includes, in its category, a semiconductor to which an impurity element imparting p-type conductivity is added intentionally or unintentionally at the time of deposition or after the deposition. 
     The light-blocking layer  257  is positioned above the light-emitting element  230  and overlaps with the light-receiving element. The light-blocking layer  257  between the light-receiving element and the sealing layer  213  can prevent the light-receiving element from being irradiated with light emitted from the light-emitting element  230 . 
     The conductive layer  281  and the conductive layer  283  are electrically connected to the light-receiving element. The conductive layer  281  preferably transmits light incident on the light-receiving element. The conductive layer  283  preferably blocks light incident on the light-receiving element. 
     It is preferable to provide an optical touch sensor between the substrate  181  and the sealing layer  213  because the optical touch sensor is less likely to be affected by light emitted from the light-emitting element  230  and can have an improved S/N ratio. 
     Specific Example 3 
       FIG. 21B  illustrates another example of the light extraction portion  182  in the light-emitting panel. The light-emitting panel in  FIG. 2113  is capable of touch operation. 
     The light-emitting panel illustrated in  FIG. 21B  includes the element layer  180 , the bonding layer  185 , and the substrate  181 . The element layer  180  includes the substrate  201 , the bonding layer  203 , the insulating layer  205 , the plurality of transistors, the insulating layer  207 , an insulating layer  209   a , an insulating layer  209   b , the plurality of light-emitting elements, the insulating layer  211 , the insulating layer  217 , the sealing layer  213 , the coloring layer  259 , the light-blocking layer  257 , the plurality of light-receiving elements, a conductive layer  280 , the conductive layer  281 , and the insulating layer  255 . 
       FIG. 21B  illustrates an example in which a light-receiving element is provided between the insulating layer  205  and the sealing layer  213 . Since the light-receiving element is provided between the insulating layer  205  and the sealing layer  213 , a conductive layer to which the light-receiving element is electrically connected and a photoelectric conversion layer included in the light-receiving element can be formed using the same materials and the same step as a conductive layer and a semiconductor layer included in the transistor  240 . Thus, the light-emitting panel capable of touch operation can be manufactured without a significant increase in the number of manufacturing steps. 
     Specific Example 4 
       FIG. 22A  illustrates another example of the light-emitting panel. The light-emitting panel in  FIG. 22A  is capable of touch operation. 
     The light-emitting panel illustrated in  FIG. 22A  includes the element layer  180 , the bonding layer  185 , and the substrate  181 . The element layer  180  includes the substrate  201 , the bonding layer  203 , the insulating layer  205 , the plurality of transistors, a conductive layer  253 , the conductive layer  254 , the insulating layer  207 , the insulating layer  209 , the plurality of light-emitting elements, the insulating layer  211 , the insulating layer  217 , the sealing layer  213 , the coloring layer  259 , the light-blocking layer  257 , the insulating layer  255 , a conductive layer  272 , a conductive layer  274 , an insulating layer  276 , an insulating layer  278 , a conductive layer  294 , and a conductive layer  296 . 
       FIG. 22A  illustrates an example in which a capacitive touch sensor is provided between the insulating layer  255  and the sealing layer  213 . The capacitive touch sensor includes the conductive layer  272  and the conductive layer  274 . 
     The conductive layer  253  and the conductive layer  254  are electrically connected to the FPC  186  via the connector  215 . The conductive layer  294  and the conductive layer  296  are electrically connected to the conductive layer  274  via conductive particles  292 . Thus, the capacitive touch sensor can be driven via the FPC  186 . 
     Specific Example 5 
       FIG. 22B  illustrates another example of the light-emitting panel. The light-emitting panel in  FIG. 22B  is capable of touch operation. 
     The light-emitting panel illustrated in  FIG. 22B  includes the element layer  180 , the bonding layer  185 , and the substrate  181 . The element layer  180  includes the substrate  201 , the bonding layer  203 , the insulating layer  205 , the plurality of transistors, the conductive layer  253 , the conductive layer  254 , the insulating layer  207 , the insulating layer  209 , the plurality of light-emitting elements, the insulating layer  211 , the insulating layer  217 , the sealing layer  213 , the coloring layer  259 , the light-blocking layer  257 , the insulating layer  255 , a conductive layer  270 , the conductive layer  272 , the conductive layer  274 , the insulating layer  276 , and the insulating layer  278 . 
       FIG. 22B  illustrates an example in which a capacitive touch sensor is provided between the insulating layer  255  and the sealing layer  213 . The capacitive touch sensor includes the conductive layer  272  and the conductive layer  274 . 
     The conductive layer  253  and the conductive layer  254  are electrically connected to an FPC  186   a  via a connector  215   a . The conductive layer  270  is electrically connected to an FPC  186   b  via a connector  215   b . Thus, the light-emitting element  230  and the transistor  240  can be driven via the FPC  186   a , and the capacitive touch sensor can be driven via the FPC  186   b.    
     Specific Example 6 
       FIG. 23A  illustrates another example of the light extraction portion  182  in the light-emitting panel. 
     The light extraction portion  182  in  FIG. 23A  includes the substrate  181 , the bonding layer  185 , a substrate  202 , the insulating layer  205 , the plurality of transistors, the insulating layer  207 , a conductive layer  208 , the insulating layer  209   a , the insulating layer  209   b , the plurality of light-emitting elements, the insulating layer  211 , the sealing layer  213 , and the coloring layer  259 . 
     The light-emitting element  230  includes the lower electrode  231 , the EL layer  233 , and the upper electrode  235 . The lower electrode  231  is electrically connected to the source electrode or the drain electrode of the transistor  240  via the conductive layer  208 . An end portion of the lower electrode  231  is covered with the insulating layer  211 . The light-emitting element  230  has a top emission structure. The lower electrode  231  has a light-transmitting property and transmits light emitted from the EL layer  233 . 
     The coloring layer  259  is provided to overlap with the light-emitting element  230 , and light emitted from the light-emitting element  230  is extracted from the substrate  181  side through the coloring layer  259 . The space between the light-emitting element  230  and the substrate  202  is filled with the sealing layer  213 . The substrate  202  can be formed using a material similar to that of the substrate  201 . 
     Specific Example 7 
       FIG. 23B  illustrates another example of the light-emitting panel. 
     The light-emitting panel illustrated in  FIG. 23B  includes the element layer  180 , the bonding layer  185 , and the substrate  181 . The element layer  180  includes the substrate  202 , the insulating layer  205 , a conductive layer  310   a , a conductive layer  310   b , the plurality of light-emitting elements, the insulating layer  211 , a conductive layer  212 , and the sealing layer  213 . 
     The conductive layer  310   a  and the conductive layer  310   b , which are external connection electrodes of the light-emitting panel, can each be electrically connected to an FPC or the like. 
     The light-emitting element  230  includes the lower electrode  231 , the EL layer  233 , and the upper electrode  235 . An end portion of the lower electrode  231  is covered with the insulating layer  211 . The light-emitting element  230  has a bottom emission structure. The lower electrode  231  has a light-transmitting property and transmits light emitted from the EL layer  233 . The conductive layer  212  is electrically connected to the lower electrode  231 . 
     The substrate  181  may have, as a light extraction structure, a hemispherical lens, a micro lens array, a film provided with an uneven surface structure, a light diffusing film, or the like. For example, the substrate  181  with a light extraction structure can be formed by attaching the above lens or film to a resin substrate with an adhesive or the like having substantially the same refractive index as the substrate or the lens or film. 
     The conductive layer  212  is preferably, though not necessarily, provided because voltage drop due to the resistance of the lower electrode  231  can be prevented. In addition, for a similar purpose, a conductive layer electrically connected to the upper electrode  235  may be provided over the insulating layer  211 . 
     The conductive layer  212  can be a single layer or a stacked layer formed using a material selected from copper; titanium, tantalum, tungsten, molybdenum, chromium, neodymium, scandium, nickel, or aluminum, or an alloy material containing any of these materials as its main component. The thickness of the conductive layer  212  can be greater than or equal to 0.1 μm and less than or equal to 3 μm, preferably greater than or equal to 0.1 μm and less than or equal to 0.5 μm. 
     When a paste (e.g., silver paste) is used as a material for the conductive layer electrically connected to the upper electrode  235 , metal particles forming the conductive layer aggregate; therefore; the surface of the conductive layer is rough and has many gaps. Thus, it is difficult for the EL layer  233  to completely cover the conductive layer; accordingly, the upper electrode and the conductive layer are preferably electrically connected to each other easily. 
     Examples of Materials 
     Next, materials and the like that can be used for a light-emitting panel are described. Note that description on the components already described in this embodiment is omitted. 
     The element layer  180  includes at least a light-emitting layer. As the light-emitting element, a self-luminous element can be used, and an element whose luminance is controlled by current or voltage is included in the category of the light-emitting element. For example, a light-emitting diode (LED), an organic EL element; an inorganic EL element, or the like can be used. Among the above elements, the organic EL element is particularly preferable in terms of luminous efficiency and a manufacturing method. 
     The element layer  180  may further include a transistor for driving the light-emitting element, a touch sensor, or the like. 
     The structure of the transistors in the light-emitting panel is not particularly limited. For example, a forward staggered transistor or an inverted staggered transistor may be used. A top-gate transistor or a bottom-gate transistor may be used. A semiconductor material used for the transistors is not particularly limited, and for example, silicon or germanium can be used. Alternatively, an oxide semiconductor containing at least one of indium, gallium, and zinc, such as an —In—Ga—Zn-based metal oxide, may be used. 
     There is no particular limitation on the crystallinity of a semiconductor material used for the transistors, and an amorphous semiconductor or a semiconductor having crystallinity (a microcrystalline semiconductor, a polycrystalline semiconductor, a single-crystal semiconductor, or a semiconductor partly including crystal regions) may be used. It is preferable that a semiconductor having crystallinity be used, in which case deterioration of the transistor characteristics can be suppressed. 
     The light-emitting element included in the light-emitting panel includes a pair of electrodes (the lower electrode  231  and the upper electrode  235 ); and the EL layer  233  between the pair of electrodes. One of the pair of electrodes functions as an anode and the other functions as a cathode. 
     The light-emitting element may have any of a top emission structure, a bottom emission structure, and a dual emission structure. A conductive film that transmits visible light is used as the electrode through which light is extracted. A conductive film that reflects visible light is preferably used as the electrode through which light is not extracted. 
     The conductive film that transmits visible light can be formed using, for example, indium oxide, indium tin oxide (ITO), indium zinc oxide, zinc oxide, or zinc oxide to which gallium is added. Alternatively, a film of a metal material such as gold, silver, platinum, magnesium, nickel, tungsten, chromium, molybdenum, iron, cobalt, copper, palladium, or titanium; an alloy containing any of these metal materials; or a nitride of any of these metal materials (e.g., titanium nitride) can be formed thin so as to have a light-transmitting property. Further alternatively, a stack of any of the above materials can be used as the conductive layer. For example, a stacked film of ITO and an alloy of silver and magnesium is preferably used, in which case conductivity can be increased. Further still alternatively, graphene or the like may be used. 
     For the conductive film that reflects visible light, for example, a metal material such as aluminum, gold, platinum, silver, nickel, tungsten, chromium, molybdenum, iron, cobalt, copper, or palladium or an alloy containing any of these metal materials can be used. Moreover, lanthanum, neodymium, germanium, or the like may be added to the metal material or the alloy. Furthermore, an alloy containing aluminum (an aluminum alloy) such as an alloy of aluminum and titanium, an alloy of aluminum and nickel, or an alloy of aluminum and neodymium; or an alloy containing silver such as an alloy of silver and copper, an alloy of silver, palladium, and copper, or an alloy of silver and magnesium can be used for the conductive film. An alloy of silver and copper is preferable because of its high heat resistance. Furthermore, when a metal film or a metal oxide film is stacked on and in contact with an aluminum alloy film, oxidation of the aluminum alloy film can be prevented. Examples of a material for the metal film or the metal oxide film are titanium and titanium oxide. Alternatively, the above conductive film that transmits visible light and a film containing a metal material may be stacked. For example, a stacked film of silver and ITO or a stacked film of an alloy of silver and magnesium and ITO can be used. 
     Each of the electrodes can be formed by an evaporation method or a sputtering method. Alternatively, a discharging method such as an ink-jet method, a printing method such as a screen printing method, or a plating method may be used. 
     When a voltage higher than the threshold voltage of the light-emitting element is applied between the lower electrode  231  and the upper electrode  235 , holes are injected to the EL layer  233  from the anode side and electrons are injected to the EL layer  233  from the cathode side. The injected electrons and holes are recombined in the EL layer  233  and a light-emitting substance contained in the EL layer  233  emits light. 
     The EL layer  233  includes at least a light-emitting layer. In addition to the light-emitting layer, the EL layer  233  may further include one or more layers containing any of a substance with a high hole-injection property, a substance with a high hole-transport property, a hole-blocking material, a substance with a high electron-transport property, a substance with a high electron-injection property, a substance with a bipolar property (a substance with a high electron- and hole-transport property), and the like. 
     For the EL layer  233 , either a low molecular compound or a high molecular compound can be used, and an inorganic compound may also be used. Each of the layers included in the EL layer  233  can be formed by any of the following methods: an evaporation method (including a vacuum evaporation method), a transfer method, a printing method, an ink-jet method, a coating method, and the like. 
     In the element layer  180  the light-emitting element is preferably provided between a pair of insulating films with low water permeability. Thus, an impurity such as water can be prevented from entering the light-emitting element, leading to prevention of a decrease in the reliability of the light-emitting device. 
     As an insulating film with low water permeability, a film containing nitrogen and silicon e.g., a silicon nitride film or a silicon nitride oxide film), a film containing nitrogen and aluminum (e.g., an aluminum nitride film), or the like can be used. Alternatively, a silicon oxide film, a silicon oxynitride film, an aluminum oxide film, or the like can be used. 
     For example, the water vapor transmittance of the insulating film with low water permeability is lower than or equal to 1×10 −5  [g/m 2 ·day], preferably lower than or equal to 1×10 −6  [g/m 2 ·day], further preferably lower than or equal to 1×10 −7  [g/m 2 ·day], still further preferably lower than or equal to 1×10 −8  [g/m 2 ·day]. 
     The substrate  181  has a light-transmitting property and transmits at least light emitted from the light-emitting element included in the element layer  180 . The substrate  181  may be a flexible substrate. Moreover, the refractive index of the substrate  181  is higher than that of the air. 
     An organic resin, which is lightweight than glass, is preferably used for the substrate  181 , in which case the light-emitting device can be more lightweight as compared to the case where glass is used. 
     Examples of a material having flexibility and a light-transmitting property with respect to visible light include glass that is thin enough to have flexibility, polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), a polyacrylonitrile resin, a polyimide resin, a polymethyl methacrylate resin, a polycarbonate (PC) resin, a polyethersulfone (PES) resin, a polyamide resin, a cycloolefin resin, a polystyrene resin, a polyamide imide resin, and a polyvinyl chloride resin. In particular, a material whose thermal expansion coefficient is low is preferable, and for example, a polyamide imide resin, a polyimide resin, or PET can be suitably used. A substrate in which a glass fiber is impregnated with an organic resin or a substrate whose thermal expansion coefficient is reduced by mixing an organic resin with an inorganic filler can also be used. 
     The substrate  181  may have a stacked-layer structure in which a hard coat layer (such as a silicon nitride layer) by which a surface of a light-emitting device is protected from damage, a layer (such as an aramid resin layer) which can disperse pressure, or the like is stacked over a layer of any of the above-described materials. Furthermore, to suppress a decrease in the lifetime of the light-emitting element due to moisture and the like, the insulating film with low water permeability may be included in the stacked-layer structure. 
     The bonding layer  185  has a light-transmitting property and transmits at least light emitted from the light-emitting element included in the element layer  180 . Moreover, the refractive index of the bonding layer  185  is higher than that of the air. 
     For the bonding layer  185 , a resin that is curable at room temperature such as a two-component type resin, a light-curable resin, a heat-curable resin, or the like can be used. The examples include an epoxy resin, an acrylic resin, a silicone resin, a phenol resin, and the like. In particular, a material with low moisture permeability, such as an epoxy resin, is preferable. 
     Furthermore, the resin may include a drying agent. For example, a substance that adsorbs moisture by chemical adsorption, such as oxide of an alkaline earth metal (e.g., calcium oxide or barium oxide), can be used. Alternatively, a substance that adsorbs moisture by physical adsorption, such as zeolite or silica gel, may be used. The drying agent is preferably included because entry of an impurity such as moisture into the light-emitting element can be suppressed, thereby improving the reliability of the light-emitting device. 
     In addition, it is preferable to mix a filler with a high refractive index e.g., titanium oxide) into the resin, in which case the efficiency of light extraction from the light-emitting element can be improved. 
     The bonding layer  185  may also include a scattering member for scattering light. For example, the bonding layer  185  can be a mixture of the above resin and particles having a refractive index different from that of the resin. The particles function as the scattering member for scattering light. 
     The difference in refractive index between the resin and the particles with a refractive index different from that of the resin is preferably 0.1 or more, further preferably 0.3 or more. Specifically, an epoxy resin, an acrylic resin, an inside resin, silicone, or the like can be used as the resin, and titanium oxide, barium oxide, zeolite, or the like can be used as the particles. 
     Particles of titanium oxide or barium oxide are preferable because they scatter light excellently. When zeolite is used, it can adsorb water contained in the resin and the like, thereby improving the reliability of the light-emitting element. 
     The insulating layer  205  and the insulating layer  255  can each be formed using an inorganic insulating material. It is particularly preferable to use the insulating film with low water permeability, in which case a highly reliable light-emitting panel can be provided. 
     The insulating layer  207  has an effect of preventing diffusion of impurities into a semiconductor included in the transistor. As the insulating layer  207 , an inorganic insulating film such as a silicon oxide film, a silicon oxynitride film, or an aluminum oxide film can be used. 
     As each of the insulating layers  209 ,  209   a , and  209   b , an insulating film with a planarization function is preferably selected in order to reduce surface unevenness due to the transistor or the like. For example, an organic material such as a polyimide-based resin, an acrylic-based resin, or a benzocyclobutene-based resin can be used. As an alternative to such an organic material, a low-dielectric constant material (a low-k material) or the like can be used. Note that a plurality of insulating films formed of these materials or inorganic insulating films may be stacked. 
     The insulating layer  211  is provided to cover an end portion of the lower electrode  231 . In order that the insulating layer  211  be favorably covered with the EL layer  233  and the upper electrode  235  formed thereover, a sidewall of the insulating layer  211  preferably has a tilted surface with continuous curvature. 
     As a material for the insulating layer  211 , a resin or an inorganic insulating material can be used. As the resin, for example, a polyimide-based resin, a poly amide-based resin, an acrylic-based resin, a siloxane-based resin, an epoxy-based resin, a phenol-based resin, or the like can be used. In particular, either a negative photosensitive resin or a positive photosensitive resin is preferably used for easy formation of the insulating layer  211 . 
     There is no particular limitation on the method for forming the insulating layer  211 ; a photolithography method, a sputtering method, an evaporation method, a droplet discharge method (e.g., an ink-jet method), a printing method (e.g., a screen printing method or an off-set printing method), or the like may be used. 
     The insulating ay  217  can be formed using an inorganic insulating material, an organic insulating material, a metal material, or the like. As the organic insulating material, for example, a negative or positive photosensitive resin, a non-photosensitive resin, or the like can be used. As the metal material, titanium, aluminum, or the like can be used. When a conductive material is used for the insulating layer  217  and the insulating layer  217  is electrically connected to the upper electrode  235 , voltage drop due to the resistance of the upper electrode  235  can be prevented. The insulating layer  217  may have either a tapered shape or an inverse tapered shape. 
     Each of the insulating layers  276 ,  278 ,  291 ,  293 , and  295  can be formed using an inorganic insulating material or an organic insulating material. It is particularly preferable to use an insulating layer with a planarization function for each of the insulating layers  278  and  295  in order to reduce surface unevenness due to a sensor element. 
     For the sealing layer  213 , a resin that is curable at room temperature such as a two-component type resin, a light-curable resin, a heat-curable resin, or the like can be used. For example, a polyvinyl chloride (PVC) resin, an acrylic resin, a polyimide resin, an epoxy resin, a silicone resin, a polyvinyl butyral (PVB) resin, an ethylene vinyl acetate (EVA) resin, or the like can be used. A drying agent may be contained in the sealing layer  213 . In the case where light emitted from the light-emitting element  230  is extracted outside the light-emitting panel through the sealing layer  213 , the sealing layer  213  preferably includes a filler with a high refractive index or a scattering member. Materials for the drying agent, the filler with a high refractive index, and the scattering member are similar to those that can be used for the bonding layer  185 . 
     Each of the conductive layers  253 ,  254 ,  294 , and  296  can be formed using the same material and the same step as a conductive layer included in the transistor or the light-emitting element. The conductive layer  280  can be formed using the same material and the same step as a conductive layer included in the transistor. 
     For example, each of the conductive layers can be formed to have a single-layer structure or a stacked-layer structure using any of metal materials such as molybdenum, titanium, chromium, tantalum, tungsten, aluminum, copper, neodymium, and scandium, and an alloy material containing any of these elements. Each of the conductive layers may be formed using a conductive metal oxide. As the conductive metal oxide, indium oxide (e.g., In 2 O 3 ), tin oxide (e.g., SnO 2 ), zinc oxide (ZnO), ITO, indium zinc oxide (e.g., In 2 O 3 —ZnO), or any of these metal oxide materials in which silicon oxide is contained can be used. 
     Each of the conductive layers  208 ,  212 ,  310   a , and  310   b  can also be formed using any of the above metal materials, alloy materials, and conductive metal oxides. 
     Each of the conductive layers  272 ,  274 ,  281 , and  283  is a conductive layer having a light-transmitting property. The conductive layer can be formed using, for example, indium oxide, ITO, indium zinc oxide, zinc oxide, zinc oxide to which gallium is added, or the like. The conductive layer  270  can be formed using the same material and the same step as the conductive layer  272 . 
     As the conductive particles  292 , particles of an organic resin, silica, or the like coated with a metal material are used. It is preferable to use nickel or gold as the metal material because contact resistance can be decreased. It is also preferable to use particles each coated with layers of two or more kinds of metal materials, such as particles coated with nickel and further with gold. 
     For the connector  215 , it is possible to use a paste-like or sheet-like material which is obtained by mixture of metal particles and a thermosetting resin and for which anisotropic electric conductivity is provided by thermocompression bonding. As the metal particles, particles in which two or more kinds of metals are layered, for example, nickel particles coated with gold are preferably used. 
     The coloring layer  259  is a colored layer that transmits light in a specific wavelength range. For example, a red (R) color filter for transmitting light in a red wavelength range, a green (G) color filter for transmitting light in a green wavelength range, a blue (B) color filter for transmitting light in a blue wavelength range, or the like can be used. Each coloring layer is formed in a desired position with any of a variety of materials by a printing method, an ink-jet method, an etching method using a photolithography method, or the like. 
     The light-blocking layer  257  is provided between the adjacent coloring layers  259 . The light-blocking layer  257  blocks light emitted from the adjacent light-emitting element, thereby preventing color mixture between adjacent pixels. Here, the coloring layer  259  is provided such that its end portion overlaps with the light-blocking layer  257 , whereby light leakage can be reduced. The light-blocking layer  257  can be formed using a material that blocks light emitted from the light-emitting element, for example, a metal material, a resin material including a pigment or a dye, or the like. Note that the light-blocking layer  257  is preferably provided in a region other than the light extraction portion  182 . Such as the driver circuit portion  184 , as illustrated in  FIG. 20A , in which case undesired leakage of guided light or the like can be prevented. 
     The insulating layer  261  covering the coloring layer  259  and the light-blocking layer  257  is preferably provided because it can prevent an impurity such as a pigment included in the coloring layer  259  or the light-blocking layer  257  from diffusing into the light-emitting element or the like. For the insulating layer  261 , a light-transmitting material is used, and an inorganic insulating material or an organic insulating material can be used. The insulating film with low water permeability may be used for the insulating layer  261 . 
     Manufacturing Method Example 
     Next, an example of a manufacturing method of a light-emitting panel is described with reference to  FIGS. 24A to 24C  and  FIGS. 25A to 25C . Here, the manufacturing method is described using the light-emitting panel of Specific Example 1 ( FIG. 20B ) as an example. 
     First, a separation layer  303  is formed over a formation substrate  301 , and the insulating layer  205  is formed over the separation layer  303 . Next, the plurality of transistors, the conductive layer  254 , the insulating layer  207 , the insulating layer  209 , the plurality of light-emitting elements, and the insulating layer  211  are formed over the insulating layer  205 . An opening is formed in the insulating layers  211 ,  209 , and  207  to expose the conductive layer  254  ( FIG. 24A ). 
     In addition, a separation layer  307  is formed over a formation substrate  305 , and the insulating layer  255  is formed over the separation layer  307 . Next, the light-blocking layer  257 , the coloring layer  259 , and the insulating layer  261  are formed over the insulating layer  255  ( FIG. 24B ). 
     The formation substrate  301  and the formation substrate  305  can each be a glass substrate, a quartz substrate, a sapphire substrate, a ceramic substrate, a metal substrate, or the like, 
     For the glass substrate, for example, a glass material such as aluminosilicate glass, aluminohorosilicate glass, or barium borosilicate glass can be used. When the temperature of heat treatment performed later is high, a substrate having a strain point of 730° C. or higher is preferably used. Note that when containing a large amount of barium oxide (Bat)), the glass substrate can be heat-resistant and more practical. Alternatively, crystallized glass or the like may be used. 
     In the case where a glass substrate is used as the formation substrate, an insulating film such as a silicon oxide film, a silicon oxynitride film, a silicon nitride film, or a silicon nitride oxide film is preferably formed between the formation substrate and the separation layer, in which case contamination from the glass substrate can be prevented. 
     The separation layer  303  and the separation layer  307  each have a single-layer structure or a stacked-layer structure containing an element selected from tungsten, molybdenum, titanium, tantalum, niobium, nickel, cobalt, zirconium, zinc, ruthenium, rhodium, palladium, osmium, iridium, and silicon; an alloy material containing any of the elements; or a compound material containing any of the elements. A crystal structure of a layer containing silicon may be amorphous, microcrystal, or polycrystal. 
     The separation layer can be formed by a sputtering method, a plasma CVD method, a coating method, a printing method, or the like. Note that a coating method includes a spin coating method, a droplet discharge method, and a dispensing method. 
     In the case where the separation layer has a single-layer structure, a tungsten layer, a molybdenum layer, or a layer containing a mixture of tungsten and molybdenum is preferably formed. Alternatively, a layer containing an oxide or an oxynitride of tungsten, a layer containing an oxide or an oxynitride of molybdenum, or a layer containing an oxide or an oxynitride of a mixture of tungsten and molybdenum may be formed. Note that the mixture of tungsten and molybdenum corresponds to an alloy of tungsten and molybdenum, for example. 
     In the case where the separation layer is formed to have a stacked-layer structure including a layer containing tungsten and a layer containing an oxide of tungsten, the layer containing an oxide of tungsten may be formed as follows: the layer containing tungsten is formed first and an insulating film formed of an oxide is formed thereover, so that the layer containing an oxide of tungsten is formed at the interface between the tungsten layer and the insulating film. Alternatively, the layer containing an oxide of tungsten may be formed by performing thermal oxidation treatment, oxygen plasma treatment, nitrous oxide (N 2 O) plasma treatment, treatment with a highly oxidizing solution such as ozone water, or the like on the surface of the layer containing tungsten. Plasma treatment or heat treatment may be performed in an atmosphere of oxygen, nitrogen, or nitrous oxide alone, or a mixed gas of any of these gasses and another gas. Surface condition of the separation layer is changed by the plasma treatment or heat treatment, whereby adhesion between the separation layer and the insulating film formed later can be controlled. 
     Note that alternatively, an insulating layer may be provided between the insulating layer  205  or the insulating layer  255 , and the separation layer so that separation can be performed at an interface between the insulating layer, and the insulating layer  205  or the insulating layer  255 . The insulating layer preferably has a single-layer structure or a stacked-layer structure including any of a silicon nitride film, a silicon oxynitride film, a silicon nitride oxide film, and the like. 
     Each of the insulating layers can be formed by a sputtering method, a plasma CVD method, a coating method, a printing method, or the like. For example, the insulating layer is formed at a temperature higher than or equal to 250° C. and lower than or equal to 400° C. by a plasma CVD method, whereby the insulating layer can be a dense film with very low water permeability. 
     Then, a material for the sealing layer  213  is applied to a surface of the formation substrate  305  over which the coloring layer  259  and the like are formed or a surface of the formation substrate  301  over which the light-emitting element  230  and the like are formed, and the formation substrate  301  and the formation substrate  305  are attached so that these two surfaces face each other with the sealing layer  213  positioned therebetween ( FIG. 24C ). 
     Next, the formation substrate  301  is separated, and the exposed insulating layer  205  and the substrate  201  are attached to each other with the bonding layer  203 . Furthermore, the formation substrate  305  is separated, and the exposed insulating layer  255  and the substrate  181  are attached to each other with the bonding layer  185 . Although the substrate  181  does not overlap with the conductive layer  254  in  FIG. 25A , the substrate  181  may overlap with the conductive layer  254 . 
     Any of a variety of methods can be used as appropriate for the separation process. For example, when a layer including a metal oxide film is formed as the separation layer on the side in contact with the layer to be separated, the metal oxide film is embrittled by crystallization, whereby the layer to be separated can be separated from the formation substrate. Alternatively, when an amorphous silicon film containing hydrogen is formed as the separation layer between the formation substrate with high heat resistance and the layer to be separated, the amorphous silicon film is removed by laser light irradiation or etching, whereby the layer to be separated can be separated from the formation substrate. Alternatively, after a layer including a metal oxide film is formed as the separation layer on the side in contact with the layer to be separated, the metal oxide film is embrittled by crystallization, and part of the separation layer is further removed by etching using a solution or a fluoride gas such as NF 3 , BrF 3 , or ClF 3 , whereby the separation can be performed at the embrittled metal oxide film. Further alternatively, a method carried out as follows may be employed: a film containing nitrogen, oxygen, hydrogen, or the like (e.g., an amorphous silicon film containing hydrogen, an alloy film containing hydrogen, an alloy film containing oxygen, or the like) is used as the separation layer, and the separation layer is irradiated with laser light to release the nitrogen, oxygen, or hydrogen contained in the separation layer as gas, thereby promoting separation between the layer to be separated and the formation substrate. Alternatively, it is possible to use a method in which the formation substrate provided with the layer to be separated is removed mechanically or by etching using a solution or a fluoride gas such as NF 3 , BrF 3 , or ClF 3 , or the like. In this case, the separation layer is not necessarily provided. 
     Furthermore, the separation process can be performed easily by combination of the above-described separation methods. In other words, separation can be performed with physical force (by a machine or the like) after performing laser light irradiation, etching on the separation layer with a gas, a solution, or the like, or mechanical removal with a sharp knife, a scalpel or the like so that the separation layer and the layer to be separated can be easily separated from each other. 
     Separation of the layer to be separated from the formation substrate may be performed by filling the interface between the separation layer and the layer to be separated with a liquid. Furthermore, the separation may be performed while pouring a liquid such as water. 
     As another separation method, in the case where the separation layer is formed using tungsten, it is preferable that the separation be performed while etching the separation layer using a mixed solution of ammonium water and a hydrogen peroxide solution. 
     Note that the separation layer is not necessary in the case where separation at the interface between the formation substrate and the layer to be separated is possible. For example, glass is used as the formation substrate, an organic resin such as polyimide is formed in contact with the glass, and an insulating film, a transistor, and the like are formed over the organic resin. In this case, heating the organic resin enables the separation at the interface between the formation substrate and the organic resin. Alternatively, separation at the interface between a metal layer and the organic resin may be performed in the following manner: the metal layer is provided between the formation substrate and the organic resin and current is made to flow in the metal layer so that the metal layer is heated. 
     Lastly, an opening is formed in the insulating layer  255  and the sealing layer  213  to expose the conductive layer  254  ( FIG. 25B ). In the case where the substrate  181  overlaps with the conductive layer  254 , the opening is formed also in the substrate  181  and the bonding layer  185  ( FIG. 25C ). The method for forming the opening is not particularly limited and may be, for example, a laser ablation method, an etching method, an ion beam sputtering method, or the like. As another method, a cut may be made in a film over the conductive layer  254  with a sharp knife or the like and part of the film may be separated by physical force. 
     In the above-described manner, the light-emitting panel can be manufactured. 
     As described above, a light-emitting panel of this embodiment includes two substrates; one is the substrate  181  and the other is the substrate  201  or the substrate  202 . The light-emitting panel can be formed with two substrates even when including a touch sensor. Owing to the use of the minimum number of substrates, improvement in light extraction efficiency and improvement in clarity of display can be easily achieved. 
     This embodiment can be combined as appropriate with any of the other embodiments in this specification. 
     Embodiment 4 
     In this embodiment, a light-emitting panel that can be used in the data processing device will be described with reference to  FIG. 26 . 
     The light-emitting panel illustrated in  FIG. 26  includes a substrate  401 , the transistor  240 , the light-emitting element  230 , the insulating layer  207 , the insulating layer  209 , the insulating layer  211 , the insulating layer  217 , a space  405 , the insulating layer  261 , the light-blocking layer  257 , the coloring layer  259 , a light-receiving element (including the p-type semiconductor layer  271 , the i-type semiconductor layer  273 , and the n-type semiconductor layer  275 ), the conductive layer  281 , the conductive layer  283 , the insulating layer  291 , the insulating layer  293 , the insulating layer  295 , and a substrate  403 . 
     The light-emitting panel includes a bonding layer (not illustrated) formed in a frame shape between the substrate  401  and the substrate  403  to surround the light-emitting element  230  and the light-receiving element. The light-emitting element  230  is sealed by the bonding layer, the substrate  401 , and the substrate  403 . 
     In the light-emitting panel of this embodiment, the substrate  403  has a light-transmitting property. Light emitted from the light-emitting element  230  is extracted to the air through the coloring layer  259 , the substrate  403 , and the like. 
     The light-emitting panel of this embodiment is capable of touch operation. Specifically, proximity or contact of an object on a surface of the substrate  403  can be sensed with the light-receiving element. 
     An optical touch sensor is highly durable and preferable because its sensing accuracy is not affected by damage to a surface that is touched by an object. An optical touch sensor is also advantageous in that it is capable of noncontact sensing, it does not degrade the clarity of images even when used in a display device, and it is applicable to large-sized light-emitting panels and display devices. 
     It is preferable to provide an optical touch sensor between the substrate  403  and the space  405  because the optical touch sensor is less likely to be affected by light emitted from the light-emitting element  230  and can have an improved S/N ratio. 
     The light-blocking layer  257  is positioned above the light-emitting element  230  and overlaps with the light-receiving element. The light-blocking layer  257  can prevent the light-receiving element from being irradiated with light emitted from the light-emitting element  230 . 
     There is no particular limitation on materials used for the substrates  401  and  403 . The substrate through which light emitted from the light-emitting element is extracted is formed using a material that transmits the light. For example, a material such as glass, quartz, ceramics, sapphire, or an organic resin can be used. Since the substrate through which light emission is not extracted does not need to have a light-transmitting property, a metal substrate using a metal material or an alloy material or the like can be used in addition to the above-described substrates. Furthermore, any of the materials for the substrates given in the above embodiments can also be used for the substrates  401  and  403 . 
     A method for sealing the light-emitting panel is not limited, and either solid sealing or hollow sealing can be employed. For example, a glass material such as a glass frit, or a resin material such as a resin that is curable at room temperature such as a two-component type resin, a light curable resin, or a thermosetting resin can be used. The space  405  may be filled with an inert gas such as nitrogen or argon, or with a resin or the like similar to that used for the sealing layer  213 . Furthermore, the resin may include the drying agent, the filler with a high refractive index, or the scattering member. 
     This embodiment can be combined as appropriate with any of the other embodiments in this specification. 
     REFERENCE NUMERALS 
       100 : data processing device,  102 : display portion,  102   a : display portion,  102   b : display portion,  104 : driver circuit portion,  104   g _ 1 : gate driver,  104   g _ 1 A: gate driver,  104   g _ 1 B: gate driver,  104   g _ 2 ; gate driver.  104   g _ 2 A: gate driver,  1042 _ 2 B: gate driver,  104   g _ 2 C: gate driver,  104   g _ 2 D: gate driver,  104   g _ 3 : gate driver,  104   g _ 4 : gate driver,  104   s _ 1 : source driver,  104   s _ 2 : source driver,  104   s _ 3 : source driver,  104   s _ 4 : source driver,  105 : display panel,  106 : sensor portion,  108 : arithmetic portion,  110 : memory portion,  120 : region,  130 : light-emitting region,  131 : light-emitting region,  132 : light-emitting region,  133 : light-emitting region,  150 : data processing device,  152 : display panel,  153   a : support panel,  155   a : support panel,  155   b : support panel,  180 : element layer,  181 : substrate,  182 : light extraction portion,  184 : driver circuit portion,  185 : bonding layer,  186 : FPC,  186   a : FPC,  186   b : FPC,  201 : substrate,  202 : substrate,  203 : bonding layer,  205 : insulating layer,  207 : insulating layer,  208 : conductive layer,  209 : insulating layer,  209   a : insulating layer,  209   b : insulating layer,  211 : insulating layer,  212 : conductive layer,  213 : sealing layer,  215 : connector,  215   a : connector,  215   b : connector,  217 : insulating layer,  230 : light-emitting element,  231 : lower electrode,  233 : EL layer,  235 : upper electrode,  240 : transistor,  253 : conductive layer,  254 : conductive layer,  255 : insulating layer,  257 : light-blocking layer,  259 : coloring layer,  261 : insulating layer,  270 : conductive layer,  271 : p-type semiconductor layer,  272 : conductive layer,  273 : i-type semiconductor layer,  274 : conductive layer,  275 : n-type semiconductor layer,  276 : insulating layer,  278 : insulating layer,  280 : conductive layer,  281 : conductive layer,  283 : conductive layer,  291 : insulating layer,  292 : conductive particles,  293 : insulating layer,  294 : conductive layer.  295 : insulating layer,  296 : conductive layer,  301 : formation substrate,  303 : separation layer,  305 : formation substrate,  307 : separation layer,  310   a : conductive layer,  310   b : conductive layer,  401 : substrate,  403 : substrate,  405 : space,  901 : transistor,  902 : capacitor,  903 : transistor,  904 : light-emitting element,  905 : wiring,  906 : wiring,  907 : wiring,  907 A: wiring,  907 B: wiring,  907 C: wiring,  907 D: wiring,  907 E: wiring,  907 F: wiring,  908 : wiring,  909 : pixel,  911 : circuit,  912 : source driver circuit,  913 : circuit,  913 A: gate driver,  913 B: gate driver,  914 : gate driver,  915 : circuit,  916 : circuit,  916 A: circuit,  91613 : circuit,  917 A: switch,  9173 : switch,  917 C: switch,  917 D: switch,  917 E: switch,  917 F: switch,  918 : wiring,  918 A: wiring,  918 B: wiring,  919 : AND circuit,  920 : wiring,  921 : circuit,  922 : AND circuit,  923 : wiring. 
     This application is based on Japanese Patent Application serial No. 2013-150588 filed with Japan Patent Office on Jul. 19, 2013, the entire contents of which are hereby incorporated by reference.