JP4391517B2 - Display device, electronic equipment - Google Patents

Description

  The present invention relates to a display device including a light emitting element, and more particularly to a portable information device such as a mobile phone and a PDA.

  In recent years, research and development of display devices using self-luminous elements typified by electroluminescence (EL) elements instead of liquid crystal displays (LCD) having pixels using liquid crystal elements have been promoted. Display devices using self-luminous elements are widely used as display screens and display devices for mobile phones, taking advantage of the high image quality, wide viewing angle, and thinness and light weight that do not require a backlight due to the self-luminous type. Use is expected.

  In addition, portable information devices are required to have high added value due to diversification of purpose of use, and recently, a device in which a sub display surface is provided on the back side of a normal display surface is provided.

  More recently, web pages can be browsed on portable information devices, and various applications have been enhanced. Therefore, there has been proposed one that can be used by switching the screen to both vertical and horizontal depending on the application.

  In addition to the original display surface, portable information devices with a sub display surface cannot be ignored in addition to the volume occupied by modules including the backlight, etc., as well as the substrate mounted with the control IC that drives them. Become. In particular, recently provided portable information devices are remarkably light and thin, and are a trade-off with high added value. For example, when a portable information device capable of double-sided display using a liquid crystal display is to be manufactured, a backlight or the like must be disposed between two screens, and it is very difficult to make the display portion thin. Met.

  Furthermore, when switching between vertical and horizontal display, the normal display device has different vertical and horizontal pixel numbers, so a separate frame memory is provided. For example, a video signal for one frame is once stored in the frame memory. Later, it was necessary to convert the video signal to the number of vertical and horizontal pixels by format conversion.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a display device that is thin and capable of duplex display and can be modularized with a small volume.

  In order to solve the above-described problems, the following measures are taken in the present invention.

  A self-luminous element typified by an EL element or the like is used for the pixel portion, and the display device is a double-sided light emitting type capable of emitting light on both the upper surface and the lower surface. One pixel is divided into, for example, a first region having a first light-emitting element and a second region having a second light-emitting element. In the first light-emitting element, the first electrode of the EL element is used as a transparent electrode. The second electrode is a reflective electrode. In the second light-emitting element, the first electrode of the EL element is a reflective electrode, and the second electrode is a transparent electrode. That is, the first light-emitting element and the second light-emitting element are configured such that the emission directions are reversed.

  Since the user does not normally see both sides at the same time, the display side may be selected according to the application. For example, when a switch element is provided in any of the current paths supplied to the EL element and light emission of the first light emitting element is used, supply of current to the second light emitting element is interrupted, and the second light emitting element When using this light emission, the first light emitting element may be configured such that supply of current is cut off.

  The present invention includes a pixel portion in which pixels are arranged in a matrix on a substrate, the pixel includes a first light emitting element and a second light emitting element, and the first light emitting element includes: Light is emitted only in one direction perpendicular to the surface of the substrate on which the pixel portion is formed, and the second light emitting element is perpendicular to the surface of the substrate on which the pixel portion is formed and opposite to the one direction. The display device is characterized by emitting light only in one direction.

  Further, the present invention includes a pixel portion in which pixels are arranged in a matrix on a substrate, the pixel includes a first light emitting element and a second light emitting element, and the first light emitting element includes: Light is emitted only in one direction perpendicular to the surface of the substrate on which the pixel portion is formed, and the second light emitting element is perpendicular to the surface of the substrate on which the pixel portion is formed and opposite to the one direction. Means for emitting light only in one direction, and selecting the light emitting element so as to emit light only in one of the two directions in which the first light emitting element and the second light emitting element emit light, respectively, There is provided a display device comprising means for emitting light in either direction.

  Furthermore, the present invention includes a pixel portion in which pixels are arranged in a matrix on a substrate, the pixel includes a first light emitting element and a second light emitting element, and the first light emitting element is The second light emitting element emits light only in one direction perpendicular to the surface of the substrate on which the pixel portion is formed, and the second light emitting element is perpendicular to the surface of the substrate on which the pixel portion is formed and in the one direction. The source signal line driving circuit, the first gate signal line driving circuit, and the second gate signal line driving circuit are formed on the surface of the substrate on which the pixel portion is formed. And a scanning direction of the first gate signal line driving circuit and a scanning direction of the second gate signal line driving circuit are orthogonal to each other.

  The present invention includes a pixel portion in which pixels are arranged in a matrix on a substrate, the pixel includes a first light emitting element and a second light emitting element, and the first light emitting element includes: Light is emitted only in one direction perpendicular to the surface of the substrate on which the pixel portion is formed, and the second light emitting element is perpendicular to the surface of the substrate on which the pixel portion is formed and in one direction. Means for emitting light only in one opposite direction and selecting the first light emitting element and the second light emitting element to emit light only in any one of the two directions. Means for emitting light in both directions, and a source signal line driver circuit, a first gate signal line driver circuit, a first gate signal line driver circuit, and a first gate signal line driver circuit on the surface of the substrate on which the pixel portion is formed Scanning of the first gate signal line driving circuit. A direction, the scanning direction of the second gate signal line driver circuit is to provide a display apparatus characterized by orthogonal.

  According to the present invention, it is possible to mount a large-screen sub-screen on a portable information device that has conventionally been mounted with only a small-size sub-screen due to space and cost, and a vertical / horizontal display switching function. As the mounting becomes easy, it is possible to further increase the added value of the portable information device.

  In addition, by using a self-luminous element that does not require a backlight, a display device that is very thin and lightweight can be manufactured.

In order to explain the present invention in more detail, it will be described below with reference to the accompanying drawings.

(Embodiment 1)
One embodiment of the present invention is shown in FIG. Although a thin film transistor (TFT) is used here as a switch element or a drive element, there is no particular limitation. For example, a MOS transistor, an organic transistor, a molecular transistor, and the like can be given, and any of them may be used similarly. In a TFT, since it is difficult to distinguish between a source region and a drain region depending on the structure and operating conditions, one is referred to as a first electrode and the other is referred to as a second electrode.

  In FIG. 2, a region surrounded by a dotted line frame 200 indicates one pixel, and the source signal line 201, the gate signal line 202, the current supply line 203, the switching TFT 204, the first driving TFT 205, and the second driving. TFT 206, first light emitting element 207, and second light emitting element 208. In each pixel, a region where the emitted light from the first light emitting element 207 is obtained is a first region, and a region where the emitted light from the second light emitting element 208 is obtained is a second region, both of which are included in one pixel. It is.

  The gate electrode of the switching TFT 204 is electrically connected to the gate signal line 202, the first electrode is electrically connected to the source signal line 201, and the second electrode is used for the first and second driving signals. It is electrically connected to the gate electrodes of the TFTs 205 and 206. The first electrode of the first driving TFT 205 is electrically connected to the current supply line 203, and the second electrode is electrically connected to the first electrode of the first light emitting element 207. The first electrode of the second driving TFT 206 is electrically connected to the current supply line 203, and the second electrode is electrically connected to the first electrode of the second light emitting element 208. The second electrode of the first light-emitting element 207 and the second electrode of the second light-emitting element 208 have a potential difference from the counter electrode 209 having a potential difference from the current supply line 203 and the current supply line 203, respectively. The counter electrode 210 is electrically connected.

  The video signal output to the source signal line 201 is input to the gate electrodes of the first and second driving TFTs 205 and 206 at the timing when the switching TFT 204 is turned ON, and the first and second video signals are output according to the video signal. A current is supplied to the light emitting elements 207 and 208 to emit light. As described above, outgoing light is obtained from the front and back of the substrate in each of the first region and the second region.

  According to this configuration, the first light emitting element 207 and the second light emitting element 208 are controlled to emit light and not emit light by the first and second driving TFTs 205 and 206. For example, as shown in FIG. Are provided with analog switches 311 and 312 that operate exclusively between the current supply line 303 and the first electrodes of the first and second driving TFTs 305 and 306, respectively. By controlling OFF, when the analog switch 311 is turned ON for a certain period and a current is supplied to the first light emitting element 307, an image is displayed in the first region. On the other hand, the analog switch 312 operating exclusively with the analog switch 311 is OFF at this time, and the current supply path to the second light emitting element 308 is cut off. Therefore, the second region does not emit light. On the other hand, during the period when the analog switch 312 is turned on, current is supplied to the second light emitting element 308, and an image is displayed in the second region, the analog switch 311 is turned off and the first light emitting element 307 is turned on. Shut off the current supply path. Therefore, the first region does not emit light. At this time, the display surface control signal is output when the user performs some operation, and the display surface may be switched, or the display surface control signal is used (for example, whether the device is folded or opened). Etc.), the switching operation may be automatically performed.

  FIG. 4 shows a case where the analog switches 311 and 312 are not operated exclusively but the analog switches 311 and 312 are independently controlled using the display surface control signal 1 and the display surface control signal 2. According to the configuration shown in FIG. 4, display / non-display of both the first area and the second area can be arbitrarily switched. 3, reference numeral 301 denotes a source signal line, 302 denotes a gate signal line, 304 denotes a switching TFT, 313 denotes an inverter, and in FIG. 4, 413 denotes an inverter, 414 denotes an inverter, and FIG. The same code | symbol is used for the same location.

  As a method for displaying different images in the first area and the second area using the configuration shown in FIGS. 3 and 4, for example, the display of the first area in an odd frame is performed in one frame period. For example, the second area may be displayed in an even frame. At this time, the display surface control signal may be inverted every frame period so that the analog switches 311 and 312 can be switched ON / OFF for each frame.

(Embodiment 2)
In the present embodiment, the circuit configuration will be mainly described.

  FIG. 5A illustrates an example of a structure of the display device of the present invention. A pixel portion 501 is formed over a substrate 500, and a source signal line driver circuit 502, a first gate signal line driver circuit 503, and a second gate signal line driver circuit 504 are provided in the periphery. Input of control signals for each drive circuit and current supply to the current supply line 505 are performed by a flexible printed circuit board (FPC) 506. In FIG. 5A, a portion indicated by 510 is one pixel, and details are shown in FIG.

  In FIG. 5B, a portion indicated by a dotted frame 520 is one pixel, and the source signal line 521, the first gate signal line 522, the second gate signal line 523, the current supply line 524, and the first switching. A TFT 525, a second switching TFT 526, a first driving TFT 527, a second driving TFT 528, a storage capacitor 529, a first light emitting element 530, and a second light emitting element 531. In each pixel, the region from which the emitted light from the first light emitting element 530 is obtained is the first region, and the region from which the emitted light from the second light emitting element 531 is obtained is the second region, both of which are included in one pixel. It is.

  The gate electrode of the first switching TFT 525 is electrically connected to the first gate signal line 522, the first electrode is electrically connected to the source signal line 521, and the second electrode is the second switching. The TFT 526 is electrically connected to the first electrode. The gate electrode of the second switching TFT 526 is electrically connected to the second gate signal line 523, and the second electrode is electrically connected to the gate electrodes of the first and second driving TFTs 527 and 528, respectively. It is connected to the. The first electrode of the first driving TFT 527 is electrically connected to the current supply line 524, and the second electrode is electrically connected to the first electrode of the first light emitting element 530. The first electrode of the second driving TFT 528 is electrically connected to the current supply line 524, and the second electrode is electrically connected to the first electrode of the second light emitting element 531. The second electrode of the first light-emitting element 530 and the second electrode of the second light-emitting element 531 are a counter electrode 532 having a potential difference from the current supply line 524, and a counter electrode having a potential difference from the current supply line 524. 533 are electrically connected to each other. The storage capacitor 529 is provided to hold the gate-source voltage of the first and second driving TFTs 527 and 528. In FIG. 5B, the first and second driving TFTs 527, Although it is provided between the gate electrode 528 and the current supply line 524, the connection location is not limited thereto.

  The circuit operation will be described. In this specification, the number of pixels is m × n, but the format conversion method of the video signal is not limited. Therefore, in order to simplify the description, the case where m = n is described as an example. Refer to FIGS. 5A and 5B and FIG.

  In the case of performing the first display, that is, normal display in which the pixel portion is horizontal m × vertical n pixels, the second gate signal line driver circuit 504 keeps the second switching TFT 526 turned on over the entire screen. . Thus, the pixel is controlled only by the first switching TFT 525 and the first and second driving TFTs 527 and 528. After that, the source signal line driver circuit 502 and the first gate signal line driver circuit 503 are driven by a normal method to display an image. As shown in FIG. 6A, the order of writing video signals to the pixels is (1, 1) (2, 1)... (M, 1), (1, 2) (2, 2). (M, 2), (1, n) (2, n) (m, n).

  Next, the second display, that is, the case where the screen is switched between vertical and horizontal will be described. FIG. 6B shows a state where FIG. 6A is rotated 90 ° clockwise. The display device of the present invention does not require changing the input order of video signals. Therefore, the order of writing to the pixels in the state shown in FIG. 6B is (1, n) (1, n-1)... (1,1), (2, n) (2, n -1) ... (2, 1), ..., (m, n) (m, n-1) ... (m, 1).

  Therefore, during the second display, the source signal line driver circuit 502 operates at a lower speed than usual and outputs a sampling pulse for each horizontal period. Accordingly, video signals for one horizontal period are continuously output for each source signal line. On the other hand, the first gate signal line driving circuit 503 operates at a higher speed than usual, and outputs a gate signal line selection pulse every one dot sampling period. As a result, in each pixel, the first switching TFT 525 is turned ON only for one dot sampling period, and the video signal output to the source signal line 521 at that time is written. Further, the second gate signal line driver circuit 504 operates in synchronization with the source signal line driver circuit 502. That is, when a sampling pulse is output from the source signal line driver circuit 502 and a video signal is continuously output to the source signal line 521 in a certain column, the second gate signal line 523 is selected in that column, All the second switching TFTs 526 connected to the selected second gate signal line 523 are turned on, so that video signal writing is permitted only to that column.

  The video signal can be written to the pixel by the above operation. Therefore, the display device can be switched between vertical and horizontal without using a frame memory, and the module can be downsized.

  In addition, the vertical / horizontal switching may be performed by the user performing some operation to switch the control signal of each drive circuit, or in use (for example, the device is folded or opened). The switching operation may be automatically performed depending on the state.

  A configuration of a pixel of the display device of the present invention will be described with reference to FIG.

  In FIG. 1, a base film 6001 is formed over a substrate 6000, and a first driving TFT 6002 and a second driving TFT 6021 are formed over the base film 6001.

  The first driving TFT 6002 includes an active layer 6003, a gate electrode 6005, and a gate insulating film 6004 sandwiched between the active layer 6003 and the gate electrode 6005. Note that although the gate electrode 6005 is formed of two layers including an upper layer and a lower layer having different widths in FIG. 1, the gate electrode 6005 is not limited to this and may be formed of a single layer or a plurality of layers.

  The first driving TFT 6002 is covered with a first interlayer insulating film 6006. On the first interlayer insulating film 6006, a second interlayer insulating film 6007, a third interlayer insulating film 6008, and the like. Are stacked.

  Note that the first driving TFT 6002 and the second driving TFT 6021 have the same structure.

  In FIG. 1, 6010 and 6030 are the anodes of the first and second light emitting elements, 6011 is the electroluminescent layer, 6012 is the cathode, and the portion where the anode 6010, the electroluminescent layer 6011 and the cathode 6012 overlap is the first. A portion where the anode 6030, the electroluminescent layer 6011, and the cathode 6012 overlap with one light emitting element 6013 corresponds to the second light emitting element 6023. The first driving TFT 6002 controls a current supplied to the first light emitting element 6013 and is electrically connected to the first light emitting element 6013 directly or through another element. The second driving TFT 6021 controls a current supplied to the second light emitting element 6023 and is electrically connected to the second light emitting element 6023 directly or via another element.

  Note that the anode 6010 is desirably formed using a material having high reflectivity or light blocking property and a high work function (preferably, greater than 4.2 eV). Specifically, gold (Au), platinum (Pt), nickel (Ni), tungsten (W), chromium (Cr), molybdenum (Mo), iron (Fe), cobalt (Co), copper (Cu), Palladium (Pd), titanium nitride (TiN), etc. are mentioned. Alternatively, a method of forming an anode 6010 by forming a reflective (or light blocking) film and forming a conductive film having a high work function on the film is also effective. For example, a metal film such as Al may be formed, and indium tin oxide (ITO) or the like may be formed so as to be stacked with the metal film. Note that the ITO formed on the Al film only needs to have a film thickness that can function as an EL anode, and is desirably thin in order to prevent light deviation of emitted light from the EL layer due to interference. On the other hand, the anode 6030 is preferably formed using a material having high light transmittance. For example, ITO, zinc oxide (ZnO), indium zinc oxide (IZO), zinc oxide to which gallium is added, or the like may be used. The cathode 6012 is desirably formed so as to have a structure with a low work function (preferably, 4.2 eV or less) and high light transmittance. For example, a metal film such as an Mg: Ag alloy is formed to an extent that allows light to pass therethrough (preferably, 10 nm or less), and ITO or the like may be formed so as to be stacked with the metal film. As the thickness of the metal thin film decreases, the resistance of the metal thin film increases. However, if the conductivity can be sufficiently secured, the ITO does not necessarily have to be formed. In addition, a conductive material with high light transmittance such as ITO may be used as the cathode 6012 regardless of the work function. In this case, a method of adding a metal having a low work function, such as an alkali metal or an alkaline earth metal, or an alloy containing these metal atoms in the vicinity of a region in contact with the cathode 6012 of the electroluminescent layer 6011 in order to improve the electron injection property. Is preferred.

  The electroluminescent layer 6011 has a structure in which a light emitting layer alone or a plurality of layers including a light emitting layer are stacked.

  The anode 6010 and the anode 6030 are formed on the third interlayer insulating film 6008. A resin film 6014 used as a partition is formed over the third interlayer insulating film 6008.

  A protective film 6016 is formed over the resin film 6014 and the cathode 6012. A reflective film 6024 is formed over the protective film 6016 and plays a role of reflecting light emitted from the second light-emitting element 6023 and transmitting the light only to the substrate side.

  In addition, light emitted from the first light-emitting element 6013 is reflected by the anode 6010 and is transmitted only in the upward direction with respect to the substrate.

  By using a self-luminous element as a display device as shown in this embodiment, both sides of a panel having a thickness of 2 mm or less (preferably 1 mm or less), which cannot be achieved by a conventional display device requiring a backlight, are used. A thin display device capable of display can be realized.

  As shown in FIG. 7A, when a display device is used as a display portion of an electronic device such as a mobile phone, it is built in the form of a module 701. Here, the module 701 indicates a form in which a display device is connected to a substrate on which a signal processing LSI, a memory, and the like for driving the display device are mounted.

  A module 701 is shown as a block diagram in FIG. The module 701 includes a power supply unit 711, a signal control unit 712, an FPC 713, and a display device 714. The power supply unit 711 generates and supplies power of a plurality of desired voltage values to the source signal line drive circuit, the gate signal line drive circuit, the light emitting element, and the like from the power supplied from the external battery. The signal control unit 712 receives a video signal and a synchronization signal, converts various signals so that the display device 714 can process the signals, and drives a source signal line driver circuit and a gate signal line driver circuit. The clock signal is generated.

  Although the module 701 shown in this embodiment is manufactured independently of the display device 714, the power supply unit 711, and the signal control unit 712, they may be manufactured integrally on a substrate.

  8A and 8B show an example in which the display device of the present invention is applied to a typical mobile phone in a portable information device. Since display can be performed in two directions of the front and back of the substrate with a single display device, the thickness of the housing 800 is suppressed even when display portions are provided on both sides as shown in FIG. It becomes possible.

  As an example of use, when the device is opened, the first display surface 801 is mainly used as the display surface. The screen operation is performed with the operation button 802. The second display surface 803 that is mainly used in the state where the device is closed can conventionally only incorporate a small size because of the space, but according to the present invention, a display equivalent to the first display surface 801 is provided. By using the second display surface 803 having a size, it is possible to browse e-mails, web pages, and the like. The operation in the closed state is performed with the operation button 804.

  Recently, mobile phones equipped with digital cameras have become widespread, but even when shooting with the lens 805 facing forward, shooting is possible while monitoring on the second display surface 803 having a wide display area. It becomes.

  Further, as shown in FIG. 8B, the user can arbitrarily switch the display between vertical and horizontal directions. As described in the second embodiment, such vertical / horizontal display switching may be automatically switched by an application, or may be appropriately switched by a user's operation.

  In addition, here, a mobile phone is illustrated as a representative example, but the present invention is not limited to this, and it is easy to apply in a wide range of applications such as a PDA, a sub-notebook PC, and an electronic dictionary. Needless to say.

  FIG. 9 shows an example of a mobile phone capable of performing double-sided display using a conventional liquid crystal display device, and FIG. 10 shows an example of a mobile phone capable of performing double-sided display using the display device of the present invention. Indicates. It should be noted that common portions are illustrated as the same configuration so that the difference between the two can be expressed in a straightforward manner.

  The mobile phone illustrated in FIG. 9 includes a first housing 1101 and a second housing 1108, and has a shape that can be folded. The first housing 1101 incorporates a first display device (for main display) 1102 and a second display device (for sub display) 1103, and each display device is controlled by display controllers 1104 and 1105. ing. Further, the first housing 1101 is provided with a speaker 1106 and an antenna 1107.

  The second housing 1108 incorporates a main body driving module 1109, an operation button module 1110, a microphone 1112, and a battery 1113. The first housing 1101 and the second housing 1108 are connected to each other via a hinge 1111.

  At this time, the first display device 1103 and the second display device 1102 include a backlight. The first display area is indicated by 1151 and the second display area is indicated by 1152. The thickness of the casing on the side where the display device is provided, that is, the first casing 1101 is indicated by T1.

  The mobile phone shown in FIG. 10 similarly includes a first housing 1131 and a second housing 1108. The configuration on the second housing 1108 side is the same as that of the conventional example shown in FIG. In the display device 1132 of the present invention, self-luminous elements capable of emitting light on both sides are sandwiched between two substrates and controlled by only one display controller 1133. The first display area is indicated by 1161 and the second display area is indicated by 1162. Further, the thickness of the casing on the side where the display device is provided, that is, the first casing 1131 is indicated by T2.

  In both cases, when the thickness of the first housing is compared, it is possible to achieve a much smaller thickness by using the display device of the present invention. In the conventional example, since the main display and the sub display are provided by two independent display devices including the backlight, T1 becomes thick when displaying both sides. On the other hand, since the display device of the present invention uses a self-luminous element, it can be seen that both sides of the light can be emitted without a backlight, and that it can be much thinner than the conventional example.

  Further, when the sizes of the second display areas are compared in both cases, it can be said that the case where the display device of the present invention is used is more suitable for enlargement of the screen.

  As described above, the display device of the present invention can greatly contribute to miniaturization and high functionality of portable information terminals such as mobile phones.

  As described above, according to the present invention, it is possible to mount a large-screen sub-screen on a portable information device that has conventionally only been mounted with a small-size sub-screen due to space and cost, and further, vertically and horizontally. This makes it easy to implement the display switching function, thereby realizing further added value of portable information devices.

  In addition, by using a self-luminous element that does not require a backlight, a display device that is very thin and lightweight can be manufactured.

The figure which shows the cross section of the light emission part in the display apparatus of this invention. FIG. 11 illustrates an example of a circuit configuration of a display device of the present invention. FIG. 11 illustrates an example of a circuit configuration of a display device of the present invention. FIG. 11 illustrates an example of a circuit configuration of a display device of the present invention. FIG. 11 illustrates an example of a circuit configuration of a display device of the present invention. 8A and 8B illustrate operation timing of a display device of the present invention. The block diagram of the module and display apparatus which were built in the portable information device. The figure which shows an example of the use of this invention. The figure which shows the cross section of the mobile telephone using a liquid crystal. FIG. 6 is a cross-sectional view of a mobile phone using the display device of the present invention.

Claims (3)

A pixel portion in which pixels are arranged in a matrix;
A first light-emitting element, and the second light-emitting element, a first transistor, a second transistor, a third transistor, a source signal line, a gate signal line, a current supply line, first and A second analog switch in the pixel;
A gate electrode of the third transistor is electrically connected to the gate signal line;
A first electrode of the third transistor is electrically connected to the source signal line;
A second electrode of the third transistor is electrically connected to a gate electrode of the first transistor and a gate electrode of the second transistor;
A first electrode of the first transistor is electrically connected to the current supply line via the first analog switch;
A first electrode of the second transistor is electrically connected to the current supply line via the second analog switch;
A second electrode of the first transistor is electrically connected to the first light-emitting element;
A second electrode of the second transistor is electrically connected to the second light emitting element;
The display device characterized in that the first analog switch and the second analog switch operate exclusively. A pixel portion in which pixels are arranged in a matrix;
A first light-emitting element, and the second light-emitting element, a first transistor, a second transistor, a third transistor, a source signal line, a gate signal line, a current supply line, first and A second analog switch in the pixel ;
The gate electrode of the pre-Symbol third transistor is connected to the gate signal line electrically,
A first electrode of the third transistor is electrically connected to the source signal line;
A second electrode of the third transistor is electrically connected to a gate electrode of the first transistor and a gate electrode of the second transistor;
A first electrode of the first transistor is electrically connected to the current supply line via the first analog switch;
A first electrode of the second transistor is electrically connected to the current supply line via the second analog switch;
A second electrode of the first transistor is electrically connected to the first light-emitting element;
A second electrode of the second transistor is electrically connected to the second light emitting element;
The display device, wherein the first analog switch and the second analog switch are independently controlled. A first casing provided with the display device according to claim 1 or 2 in a display portion, a second casing, and a hinge connecting the first casing and the second casing. And having
In a state where the first casing and the second casing are folded, one of the first light emitting element and the second light emitting element is operated,
An electronic apparatus, wherein the first light-emitting element or the other of the second light-emitting elements is operated in a state where the first housing and the second housing are opened.

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