JP2012089355A - Light-emitting device and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device and an electronic apparatus which are capable of obtaining high-quality display.SOLUTION: A light-emitting unit 12 includes a function layer provided on a substrate, and anodes and a cathode which are provided so as to hold the function layer therebetween. Light emitting-elements 21-24 formed by the function layer, the anodes, and the cathode are insulated from each other and are arranged symmetrically with respect to the center of concentric circles in a plane.

Description

  The present invention relates to a light emitting device and an electronic device.

  As the light emitting device, for example, there is an organic EL (Electro Luminescence) device used as a light source of a printer head such as a line printer. In this organic EL device, a plurality of light emitting elements are arranged at predetermined intervals on an elongated substrate. Then, the light emitted from the light emitting element is applied to the photosensitive drum.

  However, if the distance between the light source and the photosensitive drum varies due to warpage of the elongated substrate (for example, a printer head) or uneven surface of the photosensitive drum, the photosensitive drum The shape and size of the light applied to the body drum will vary. Thereby, for example, the print quality is deteriorated such that the thickness of the printed line becomes uneven.

  Therefore, for example, as described in Patent Document 1, a technique for adjusting the size and the amount of light emitted by selectively emitting light from a plurality of electrodes is disclosed.

JP 2008-229927 A

  However, in the technique described in Patent Document 1, since the electrodes are arranged side by side in a plane, when the light emitting element is selectively caused to emit light, the position of the irradiation region is biased (the irradiation position is shifted laterally), There was a problem that the irradiation shape (exposure shape) on the photosensitive drum could not be stabilized.

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

  Application Example 1 A light emitting device according to this application example includes a light emitting layer provided on a substrate, and a first electrode and a second electrode provided so as to sandwich the light emitting layer. The electrode or the second electrode is constituted by a plurality of electrodes that are insulated from each other and arranged symmetrically with respect to a concentric plane.

  According to this configuration, since the first electrode or the second electrode is configured by arranging the plurality of electrodes symmetrically with respect to the concentric plane as a reference, a current is selectively passed to the plurality of electrodes. Thus, the size of the light emitting region can be changed. Furthermore, since the plurality of electrodes are arranged symmetrically, the light emission shape is similar. Thereby, for example, variation in the size of a plurality of lights irradiated to the irradiated object from the light emitting device can be suppressed. Furthermore, it is possible to change only the size of the light emitting region (shape) without moving the position of the light emitting region (for example, the position of the center of gravity). As a result, even when the substrate is warped or the surface of the irradiated object is uneven, it is possible to align the sizes and shapes of a plurality of lights, and to improve display quality.

  Application Example 2 In the light emitting device according to the application example described above, the plurality of electrodes include a center electrode disposed at a concentric position and a plurality of peripheral electrodes disposed around the center electrode. preferable.

  According to this configuration, by selectively causing the center electrode and the peripheral electrode to emit light, it is possible to emit small or large light without shifting the light emission position.

  Application Example 3 In the light emitting device according to the application example described above, it is preferable that the outer shape of the first electrode or the second electrode is any one of a round shape, an elliptical shape, and a polygonal shape.

  According to this configuration, since the first electrode or the second electrode is configured in the above-described shape, light can be emitted in an optimum shape according to the desired shape.

  Application Example 4 In the light emitting device according to the application example described above, it is preferable that a current control unit that can adjust the amount of current flowing through the light emitting layer via the plurality of electrodes is provided.

  According to this configuration, since the amount of current flowing through the light emitting layer can be adjusted by the current control unit, the light emission amount (light emission intensity) of the light emitting layer corresponding to each electrode can be partially changed. Thereby, for example, unevenness in light emission can be suppressed, and display quality (for example, a display) can be improved.

  Application Example 5 An electronic apparatus according to this application example includes the light emitting device described above.

  According to this configuration, since the above-described light emitting device is provided, it is possible to provide an electronic apparatus capable of obtaining a high-quality display.

The schematic plan view which shows the structure of a light-emitting device. The enlarged plan view which expands and shows the light emission part of the light-emitting device shown in FIG. The schematic cross section which follows the BB 'section of Figure 2. The perspective view which shows the optical writing head module in which the light-emitting device was integrated. FIG. 3 is a schematic cross-sectional view illustrating an image forming apparatus (printer) as an example of an electronic apparatus including an optical writing head module having a light emitting device. The schematic plan view which shows the light emission state of a light emission part. FIG. 3 is a schematic diagram illustrating a state of light irradiated on a photosensitive drum.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. Note that the drawings to be used are appropriately enlarged or reduced so that the part to be described can be recognized.

<Configuration of light emitting device>
FIG. 1 is a schematic plan view showing the structure of the light emitting device. FIG. 2 is an enlarged plan view showing an enlarged light emitting portion (A portion) of the light emitting device shown in FIG. FIG. 3 is a schematic cross-sectional view taken along the line BB ′ of FIG. Hereinafter, the structure of the light emitting device will be described with reference to FIGS.

  First, as illustrated in FIG. 1, the light emitting device 11 includes a plurality of light emitting units 12. More specifically, in the light emitting device 11, a plurality of light emitting units 12 (dots) are arranged in a staggered manner in the X direction, for example. A region where the plurality of light emitting units 12 gather is referred to as a light emitting region 13. Hereinafter, the structure of the light emitting unit 12 will be described with reference to FIG.

  As shown in FIG. 2, the light emitting unit 12 is configured so that the outer shape is a substantially round shape by a plurality of light emitting elements 21 to 24 made of organic EL elements. Specifically, a substantially circular first light emitting element 21 is disposed at the center of the light emitting unit 12. The second light emitting element 22 is arranged in a ring shape so as to surround substantially the entire circumference of the first light emitting element 21. Further, the third light emitting element 23 is arranged in a fan shape so as to surround substantially half the circumference of the second light emitting element 22. Similarly, the fourth light emitting element 24 is arranged in a fan shape so as to surround the remaining substantially half circumference of the second light emitting element 22.

  As described above, the second light emitting element 22 to the fourth light emitting element 24 are arranged in the outer peripheral direction from the first light emitting element 21 arranged at the center of the light emitting part 12, and thus the substantially circular light emitting part 12. Can be obtained. The light emitting elements 21 to 24 are provided with lead lines 25a to 25d that are electrically connected to TFT elements 36 (see FIG. 3) described later. The detailed shapes of the light emitting elements 21 to 24 may be determined based on the shapes of the lead wires 25a to 25d and the lead direction.

  When it is desired to reduce the size of the light emitting unit 12, for example, only the first light emitting element 21 is caused to emit light. In other words, a current is passed only through the first light emitting element 21. On the other hand, when it is desired to increase the size of the light emitting unit 12, for example, all the light emitting elements of the first light emitting element 21 to the fourth light emitting element 24 are caused to emit light. Since the 2nd light emitting element 22-the 4th light emitting element 24 are arrange | positioned on the concentric circle of the 1st light emitting element 21, (because it becomes symmetrical shape), the size of the light emission part 12 was changed as mentioned above. Even in this case, it is possible to prevent the position (center of gravity position) and shape of the light emitting unit 12 from changing.

  Hereinafter, the structure of the light emitting device 11 will be described with reference to the structural cross-sectional view shown in FIG. In addition, FIG. 3 shows the cross-sectional positional relationship of each component, and the relative relationship is exaggerated.

  As shown in FIG. 3, the light emitting unit 12 constituting the light emitting device 11 emits light in the light emitting region 31, and includes a substrate 32, a circuit element layer 33 formed on the substrate 32, and a circuit element layer. And the light emitting element layer 34 formed on the substrate 33. The substrate 32 is, for example, a silicon substrate.

In the circuit element layer 33, a base protective film 35 made of a silicon oxide film (SiO ₂ ) is formed on the substrate 32, and a TFT (Thin Film Transistor) element 36 is formed on the base protective film 35. Specifically, an island-shaped semiconductor film 41 made of a polysilicon film is formed on the base protective film 35. A source region 42 and a drain region 43 are formed in the semiconductor film 41 by introducing impurities. A portion where no impurity is introduced is a channel region 44.

  Further, a transparent gate insulating film 45 made of a silicon oxide film or the like covering the base protective film 35 and the semiconductor film 41 is formed on the circuit element layer 33. A gate electrode 46 (scanning line) made of aluminum (Al), molybdenum (Mo), tantalum (Ta), titanium (Ti), tungsten (W) or the like is formed on the gate insulating film 45.

A transparent first interlayer insulating film 51 and second interlayer insulating film 52 are formed on the gate insulating film 45 and the gate electrode 46. The first interlayer insulating film 51 and the second interlayer insulating film 52 are composed of, for example, a silicon oxide film (SiO ₂ ), a titanium oxide film (TiO ₂ ), or the like. The gate electrode 46 is provided at a position corresponding to the channel region 44 of the semiconductor film 41.

  The source region 42 of the semiconductor film 41 is electrically connected to the signal line 54 formed on the first interlayer insulating film 51 through a contact hole 53 provided through the first interlayer insulating film 51 and the gate insulating film 45. Connected. On the other hand, the drain region 43 is formed on the second interlayer insulating film 52 through a contact hole 55 provided through the second interlayer insulating film 52, the first interlayer insulating film 51, and the gate insulating film 45. It is electrically connected to an anode 61 (pixel electrode) as a first electrode.

  The light emitting element layer 34 includes the light emitting elements 21 to 24 and is formed on the substrate 32. More specifically, the light emitting element layer 34 includes an anode 61, a functional layer 62 formed on the anode 61, a partition wall 63 that partitions the functional layer 62, and a second electrode formed on the functional layer 62 and the partition wall 63. And the cathode 64 (common electrode) as a main component.

  In addition, the anode 61 which comprises the 1st light emitting element 21 shown in FIG. 2 is the 1st anode 61a as a center electrode. Moreover, the anode 61 which comprises the 2nd light emitting element 22 is the 2nd anode 61b as a peripheral electrode. The anode 61 constituting the third light emitting element 23 is a third anode 61c as a peripheral electrode. The anode 61 constituting the fourth light emitting element 24 is a fourth anode 61d as a peripheral electrode.

  The anode 61 (61 a to 61 d) is formed for each light emitting region 31. A reflective film 65 made of, for example, aluminum is formed in the second interlayer insulating film 52 below the anode 61. The anode 61 is made of a transparent ITO (Indium Tin Oxide) film, and the light emitted from the light emitting layer 62c can be reflected by the lower reflective film 65 and emitted upward.

  Further, the anode 61 is formed, for example, in substantially the same shape as each of the light emitting elements 21 to 24 described above in plan view. In the circuit element layer 33, a storage capacitor and a switching transistor (not shown) are formed. In the circuit element layer 33, a driving transistor connected to each anode 61 is formed.

  The functional layer 62 includes, for example, a hole injection layer 62a, an intermediate layer 62b, a light emitting layer 62c, and the like. A cathode 64 is arranged on the functional layer 62 and the partition wall 63. The anode 61, the functional layer 62, and the cathode 64 constitute light emitting elements 21 to 24.

  Although the anode 61 is arranged separately for each light emitting region 31, the anode 61 may be formed on the entire surface without being separated, and the cathode 64 may be arranged separately for each light emitting region 31. Good. In other words, one of the electrodes (61, 64) may be disposed separately corresponding to each light emitting region 31.

An insulating layer 66 is formed between the circuit element layer 33 and the partition wall 63. The insulating layer 66 is, for example, a silicon oxide film (SiO ₂ ). The insulating layer 66 is formed so as to run over the peripheral edge of the anode 61 in order to ensure insulation between the adjacent anodes 61 and to make the shape of the light emitting region 31 a desired shape. That is, the anode 61 and the insulating layer 66 have a structure in which they are arranged so as to partially overlap in plan view. In other words, the insulating layer 66 is formed in a region excluding the light emitting region 31.

  The partition wall 63 is formed so as to surround each light emitting region 31. In other words, the region surrounded by the partition wall 63 becomes the light emitting region 31. Examples of the material of the partition wall 63 include an organic material such as an acrylic resin.

  As described above, the functional layer 62 includes the hole injection layer 62 a, the intermediate layer 62 b, and the light emitting layer 62 c, and droplets are discharged into the region surrounded by the partition wall 63, that is, the light emitting region 31. It is formed in order using a method, for example, an inkjet method.

  The cathode 64 is formed (solid film formation) so as to cover the entire surface including the functional layer 62 and the partition wall 63. Specifically, the cathode 64 is a laminated body of calcium (Ca) and aluminum (Al), for example. On the cathode 64, a sealing member (not shown) made of a resin or the like for preventing water and oxygen from entering is laminated. The anode 61, the light emitting element layer 34, and the cathode 64 constitute the light emitting elements 21 to 24.

  The light emitting layer 62c described above is a layer of an organic light emitting material that exhibits an electroluminescence phenomenon. By applying a voltage between the anode 61 and the cathode 64, holes are injected from the hole injection layer 62a and electrons are injected from the cathode 64 into the light emitting layer 62c. The light emitting layer 62c emits light when they are combined.

<Electronic equipment>
FIG. 4 is a perspective view showing an optical writing head module in which a light emitting device is incorporated. Hereinafter, the configuration of the optical writing head module including the light emitting device will be described with reference to FIG.

  As shown in FIG. 4, the optical writing head module 201K is used in parallel with the cylindrical photosensitive drum 171K and facing it. The optical writing head module 201K includes a box 177 disposed in a direction parallel to the photosensitive drum 171K, and an optical member attached to the box 177 so as to be positioned between the box 177 and the photosensitive drum 171K. 178. The box 177 has an opening on the photosensitive drum 171K side, and the light emitting device 11 is fixed so that light is emitted toward the opening. The optical member 178 includes a SELFOC (registered trademark) lens array therein, and the light emitted from the light emitting unit 12 of the light emitting device 11 and incident on one end is emitted from the other end side to be the surface of the photosensitive drum 171K. Condensate and irradiate (draw).

  FIG. 5 is a schematic cross-sectional view showing an image forming apparatus (printer) as an example of an electronic apparatus including an optical writing head module having the above-described light emitting device. Hereinafter, the structure of an image forming apparatus including an optical writing head module having a light emitting device will be described with reference to FIG.

  As shown in FIG. 5, the image forming apparatus 180 includes optical writing head modules 201K, 201C, 201M, and 201Y in which the light emitting device 11 is incorporated, and four photosensitive drums (image bearing members) corresponding to these. Body) 171K, 171C, 171M, and 171Y are arranged as a tandem system.

  The image forming apparatus 180 includes a driving roller 191, a driven roller 192, and a tension roller 193, and an intermediate transfer belt 190 is stretched around each of the rollers so as to circulate in the direction indicated by an arrow (counterclockwise) in FIG. Is. Photosensitive drums 171K, 171C, 171M, and 171Y are arranged at predetermined intervals with respect to the intermediate transfer belt 190. These photoreceptor drums 171K, 171C, 171M, and 171Y have a photosensitive layer as an image carrier on the outer peripheral surface thereof.

  Here, K, C, M, and Y in the above symbols mean black, cyan, magenta, and yellow, respectively, and indicate that the photoconductors are for black, cyan, magenta, and yellow, respectively. The meanings of these symbols (K, C, M, Y) are the same for the other members. The photosensitive drums 171K, 171C, 171M, and 171Y are driven to rotate in the arrow direction (clockwise) in FIG. 5 in synchronization with the driving of the intermediate transfer belt 190.

  Around each photosensitive drum 171 (K, C, M, Y), charging means (corona charger) 172 for uniformly charging the outer peripheral surface of the photosensitive drum 171 (K, C, M, Y), respectively. (K, C, M, Y) and rotation of the photosensitive drum 171 (K, C, M, Y) on the outer peripheral surface uniformly charged by the charging means 172 (K, C, M, Y) And an optical writing head module 201 (K, C, M, Y) that sequentially performs line scanning.

  Further, a developing device 174 (K, C) that applies toner as a developer to the electrostatic latent image formed by the optical writing head module 201 (K, C, M, Y) to form a visible image (toner image). , M, Y) and a primary transfer roller 175 (K, Y) as transfer means for sequentially transferring the toner image developed by the developing device 174 (K, C, M, Y) to the intermediate transfer belt 190 that is a primary transfer target. C, M, Y). Further, a cleaning device 176 (K, C, M, Y) is provided as a cleaning unit for removing toner remaining on the surface of the photosensitive drum 171 (K, C, M, Y) after being transferred. Yes.

  In each optical writing head module 201 (K, C, M, Y), the array direction of each light emitting device 11 (alignment direction of the light emitting unit 12) is set to the rotation axis of the photosensitive drum 171 (K, C, M, Y). It is installed to be parallel. The main emission wavelength of each optical writing head module 201 (K, C, M, Y) and the sensitivity peak wavelength of the photosensitive drum 171 (K, C, M, Y) are set so as to substantially match. Yes.

  For example, the developing device 174 (K, C, M, Y) uses a non-magnetic one-component toner as a developer. Then, the one-component developer is conveyed to the developing roller by, for example, a supply roller, the film thickness of the developer adhered to the surface of the developing roller is regulated by a regulating blade, and the developing roller is moved to the photosensitive drum 171 (K, C, M , Y) is brought into contact with or pressed against the photosensitive drum 171 (K, C, M, Y) to cause the developer to adhere and develop as a toner image.

  The black, cyan, magenta, and yellow toner images formed by the four-color single-color toner image forming station are intermediated by the primary transfer bias applied to the primary transfer roller 175 (K, C, M, Y). Primary transfer is sequentially performed on the transfer belt 190. The toner images that are sequentially superimposed on the intermediate transfer belt 190 to become a full color are secondarily transferred to a recording medium P such as paper by a secondary transfer roller 166 and further pass through a fixing roller pair 161 that is a fixing unit. As a result, the image is fixed on the recording medium P. Thereafter, the paper is discharged onto a paper discharge tray 168 formed on the upper part of the apparatus by a paper discharge roller pair 162.

  In FIG. 5, reference numeral 163 denotes a paper feed cassette in which a large number of recording media P are stacked and held, 164 denotes a pickup roller for feeding the recording media P one by one from the paper feed cassette 163, and 165 denotes secondary transfer. A pair of gate rollers for defining the supply timing of the recording medium P to the secondary transfer portion of the roller 166, 166 is a secondary transfer roller as a secondary transfer means for forming a secondary transfer portion with the intermediate transfer belt 190, Reference numeral 167 denotes a cleaning blade as a cleaning unit that removes toner remaining on the surface of the intermediate transfer belt 190 after the secondary transfer.

  The image forming apparatus 180 includes an optical writing head module 201 (K, C, M, Y) having the above-described light emitting device 11 as an exposure unit. Therefore, the image forming apparatus 180 can emit uniform light to the photosensitive drum 171K, and can form a high-quality image.

  FIG. 6 is a schematic plan view showing a light emission state of the light emitting unit. FIG. 7 is a schematic diagram illustrating a state of light irradiated on the photosensitive drum illustrated in FIGS. 4 and 5. Hereinafter, the relationship between the size of the light emitting part (light emitting region) and the size of the irradiated light will be described with reference to FIGS.

  First, as shown in FIG. 7, the light of the light emitting unit 12 (12a to 12c, etc.) is irradiated from the optical writing head module 201K to the photosensitive drum 171K. At this time, the optical writing head module 201K may be warped or the surface of the photosensitive drum 171K may be uneven. As a result, the size (spot diameter) of the light 71 varies.

  In order to align the size of each irradiated light 71 with the light 71 having a uniform size, first, a spot diameter variation state is checked, and a unified spot diameter is determined. And in order to make it the same spot diameter, it sets to the light emission parts 12a-12c as shown, for example to Fig.6 (a)-(c).

  For example, the first light emitting unit 12a illustrated in FIG. 6A emits only the first light emitting element 21 to irradiate the light 71 having a uniform size. For example, the second light emitting unit 12b illustrated in FIG. 6B emits the light 71 having a uniform size by causing the first light emitting element 21 and the second light emitting element 22 to emit light. The third light emitting unit 12c shown in FIG. 6C has a uniform size by causing all of the first light emitting element 21, the second light emitting element 22, the third light emitting element 23, and the fourth light emitting element 24 to emit light, for example. The light 71 is irradiated. The other light emitting units 12 are similarly adjusted.

  Thus, even when the optical writing head module 201K is warped or the surface of the photosensitive drum 171K is uneven, the size (spot diameter) of the light 71 irradiated on the photosensitive drum 171K is set. Can be aligned. Moreover, since the other light emitting elements 22-24 are arrange | positioned on the concentric circle of the 1st light emitting element 21, even when light-emitting elements 21-24 are selectively light-emitted, the position and shape of the light emission part 12 change. In addition, the size of the light emitting unit 12 can be adjusted.

  In addition, it is preferable that the uneven state of the surface of the photosensitive drum 171K is read in advance over the entire circumference of the photosensitive drum 171K, and the light emitting unit 12 (the respective light emitting elements 21 to 24) is selectively caused to emit light accordingly.

  As described above in detail, according to the light emitting device 11 and the electronic apparatus of the present embodiment, the following effects can be obtained.

  (1) According to the light emitting device 11 of the present embodiment, the light emitting unit 12 is configured by arranging the first light emitting element 21 to the fourth light emitting element 24 symmetrically with respect to a concentric plane. By selectively supplying a current to each anode 61, the size of the light emitting unit 12 can be changed. Furthermore, since the plurality of anodes 61 are arranged symmetrically, the light emission shape of the light emitting unit 12 is similar. Thereby, for example, variation in the size of the plurality of lights 71 irradiated from the light emitting device 11 to the photosensitive drum 171 can be suppressed. Furthermore, only the size of the light emitting unit 12 can be changed without moving the position of the light emitting unit 12 (for example, the position of the center of gravity). As a result, even when the substrate 32 (light-emitting device 11) is warped or the surface of the photosensitive drum 171 is uneven, it is possible to align the sizes and shapes of the plurality of lights 71 and improve the display quality. be able to.

  (2) According to the light emitting device 11 of the present embodiment, the first light emitting element 21 (first anode 61 a) disposed at the center and the plurality of light emitting elements 22 to 24 disposed around the first light emitting element 21. Since the light emitting unit 12 is configured by the (anodes 61b to 61d), the anodes 61a to 61d can selectively emit light so that the light emission position can be reduced or increased without shifting the light emission position. it can.

  (3) According to the electronic apparatus of the present embodiment, since the above-described light emitting device 11 is provided, it is possible to provide an electronic apparatus that can provide a high-quality display.

  In addition, embodiment is not limited above, It can also implement with the following forms.

(Modification 1)
As described above, the shape of the anode 61 is not limited to a substantially round shape as a whole, and may be, for example, a substantially elliptical shape or a substantially polygonal shape. According to this, the light emission part 12 can be made to light-emit in the optimal shape according to the shape of the light 71 requested | required. Moreover, it is not limited to comprising the light emission part 12 by the 1st light emitting element 21-the 4th light emitting element 24, Furthermore, you may make it comprise a light emission part by adding a several light emitting element.

(Modification 2)
As described above, the light emitting elements 21 to 24 are not limited to selectively emitting light. For example, a current control unit is provided so that the amount of current flowing through the light emitting elements 21 to 24 (light emitting layer 62c) is changed. May be. Specifically, the light emission amount (light emission intensity) of each light emitting layer 62c can be partially changed by adjusting the amount of current flowing through each anode 61. Thereby, it becomes possible to suppress unevenness in light emission, and for example, display quality of a display or the like can be improved.

(Modification 3)
As described above, the light emitting units 12 are not limited to being arranged in a zigzag shape (see FIG. 1), and may be arranged in a linear shape, a plurality of rows, or a matrix, for example.

(Modification 4)
As described above, the light emitting device 11 is not limited to being applied to the image forming apparatus 180 (printer), and for example, a mobile phone, a mobile computer, a digital camera, a digital video camera, a television, a display, an in-vehicle device, an audio device It can be used for various electronic devices such as devices and lighting devices.

  DESCRIPTION OF SYMBOLS 11 ... Light-emitting device, 12 ... Light-emitting part, 12a ... 1st light-emitting part, 12b ... 2nd light-emitting part, 12c ... 3rd light-emitting part, 13 ... Light-emitting region, 21 ... 1st light-emitting element, 22 ... 2nd light-emitting element, 23 ... 3rd light emitting element, 24 ... 4th light emitting element, 25a-25d ... extraction wiring, 31 ... light emission area | region, 32 ... board | substrate, 33 ... circuit element layer, 34 ... light emitting element layer, 35 ... base protective film, 36 ... TFT element 41... Semiconductor film 42. Source region 43. Drain region 44. Channel region 45. Gate insulating film 46 Gate electrode 51. First interlayer insulating film 52 Second interlayer insulating film 53 ... contact hole, 54 ... signal line, 55 ... contact hole, 61 ... anode (pixel electrode) as first electrode, 61a ... first anode as center electrode, 61b ... second anode as peripheral electrode, 61c ... As a peripheral electrode 3 anodes, 61d ... 4th anode as peripheral electrode, 62 ... functional layer, 62a ... hole injection layer, 62b ... intermediate layer, 62c ... light emitting layer, 63 ... partition, 64 ... cathode as 2nd electrode (common electrode) , 65 ... Reflective film, 66 ... Insulating layer, 71 ... Light, 161 ... Fixing roller, 162 ... Paper discharge roller pair, 163 ... Paper feed cassette, 164 ... Pickup roller, 165 ... Gate roller pair, 166 ... Secondary transfer Roller, 167... Cleaning blade, 168... Paper discharge tray, 171 K, 171 C, 171 M, 171 Y... , 175M, 175Y ... Primary transfer roller, 176K, 176C, 176M, 176Y ... Cleaning device DESCRIPTION OF SYMBOLS 177 ... Box body, 178 ... Optical member, 180 ... Image forming apparatus, 190 ... Intermediate transfer belt, 191 ... Drive roller, 192 ... Driven roller, 193 ... Tension roller, 201K, 201C, 201M, 201Y ... Optical writing head module .

Claims (5)

A light emitting layer provided on a substrate;
A first electrode and a second electrode provided to sandwich the light emitting layer;
With
The light emitting device is characterized in that the first electrode or the second electrode is constituted by a plurality of electrodes that are insulated from each other and arranged symmetrically with respect to a concentric plane. The light-emitting device according to claim 1,
The plurality of electrodes include a center electrode disposed at concentric positions and a plurality of peripheral electrodes disposed around the center electrode. The light-emitting device according to claim 1 or 2,
The outer shape of the first electrode or the second electrode is any one of a round shape, an elliptical shape, and a polygonal shape. The light-emitting device according to any one of claims 1 to 3,
A light emitting device comprising: a current control unit capable of adjusting an amount of current flowing through the light emitting layer via the plurality of electrodes.   An electronic apparatus comprising the light-emitting device according to claim 1.

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