Light-emitting device, light-emitting module, image forming device, and electronic apparatus

Abstract

To achieve efficient placement of a bypass capacitor (capacitive element) in a light-emitting device.SOLUTION: A light-emitting device including a first side, a second side, and a third side, to which a first power supply voltage and a second power supply voltage are supplied, the light-emitting device comprising a light-emitting region having a plurality of light-emitting elements arranged in a plurality of rows along a first direction and a plurality of driving circuits configured to drive corresponding light-emitting elements among the plurality of light-emitting elements, and comprising, between the first side and the light-emitting region, a plurality of pads arranged along the first direction and connected to external terminals of the light-emitting device, a node to which the first power supply voltage is supplied, and a capacitive element connected to a node to which the second power supply voltage is supplied, wherein the capacitive element is disposed between the second side and the light-emitting region.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a light-emitting device and an image-forming apparatus having the light-emitting device. [Background technology]

[0002] Devices using organic light-emitting diodes (OLEDs) as light sources have been proposed. Examples of such devices include displays (display devices) and optical writing devices (OLED-PH: OLED Print Heads) used in image forming devices. OLED-PHs are advantageous for miniaturization and cost reduction because the OLEDs and the transistors that drive them can be formed on the same substrate. In particular, when a silicon wafer is used as the substrate, it becomes possible to form fine driving circuits, which results in a higher density of OLEDs, which serve as light sources. This allows for the formation of higher-resolution images.

[0003] Patent Document 1 discloses a light emitting device that reduces the influence of uneven light emission. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2022-162410 A Summary of the Invention [Problem to be solved by the invention]

[0005] As the size of light-emitting devices continues to shrink, there are increasing restrictions on the placement location and area of ​​bypass capacitors (capacitive elements) that suppress fluctuations in the power supply voltage by connecting them to the power supply. To ensure the characteristics of light-emitting devices, it is necessary to supply a stable power supply voltage to the light-emitting device and the circuits installed in the light-emitting device. For this reason, efficient placement of bypass capacitors (capacitive elements) that suppress power supply fluctuations is required.

[0006] In Patent Document 1, no consideration is given to the placement of such bypass capacitors (capacitive elements). [Means for solving the problem]

[0007] One aspect of the present invention is a light-emitting device having a first side extending in a first direction, a second side extending in the first direction opposite the first side, and a third side extending in a second direction that is perpendicular to the first direction, and to which a first power supply voltage and a second power supply voltage of a value different from the first power supply voltage are supplied, the light-emitting device comprising: a light-emitting region having a plurality of light-emitting elements arranged in a plurality of columns along the first direction and a plurality of drive circuits that drive corresponding light-emitting elements among the plurality of light-emitting elements; a plurality of pads arranged along the first direction between the first side and the light-emitting region and connected to external terminals of the light-emitting device; and a capacitive element connected to a node to which the first power supply voltage is supplied and a node to which the second power supply voltage is supplied, the capacitive element being arranged between the second side and the light-emitting region. [Effects of the Invention]

[0008] The present invention provides a light emitting device that realizes efficient placement of bypass capacitors, thereby enabling stable supply of power supply voltage to the light emitting device and circuits mounted on the light emitting device. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram of a light-emitting device according to Examples 1 to 4. [Figure 2] FIG. 2 is a driving circuit diagram of the light-emitting element according to the first to fourth embodiments. [Figure 3] FIG. 2 is a cross-sectional view of a light-emitting element according to Examples 1 to 4. [Figure 4] 1 is a diagram showing the substrate layout of a light-emitting device according to Examples 1 to 4. FIG. [Figure 5] FIG. 2 is a circuit diagram of a light-emitting device according to Examples 1 to 4. [Figure 6] FIG. 2 is a diagram showing the substrate layout of the light-emitting device according to the first embodiment. [Figure 7] FIG. 10 is a diagram showing the substrate layout of a light-emitting device according to a second embodiment. [Figure 8] FIG. 10 is a diagram showing the substrate layout of a light-emitting device according to a third embodiment. [Figure 9] FIG. 10 is a diagram showing the substrate layout of a light-emitting device according to Example 4. [Figure 10] 1 is a schematic diagram illustrating an example of a display device according to an embodiment of the present invention. [Figure 11] 1A is a schematic diagram illustrating an example of an imaging device according to an embodiment of the present invention, and FIG. 1B is a schematic diagram illustrating an example of an electronic device according to an embodiment of the present invention. [Figure 12] 1A is a schematic diagram illustrating an example of a display device according to an embodiment of the present invention, and FIG. 1B is a schematic diagram illustrating an example of a foldable display device. [Figure 13] 1A is a schematic diagram showing an example of an illumination device according to an embodiment of the present invention, and FIG. 1B is a schematic diagram showing an example of an automobile having a vehicle lamp according to an embodiment of the present invention. [Figure 14] 1A and 1B are schematic diagrams illustrating an example of a wearable device according to an embodiment of the present invention, each of which has an imaging device; [Figure 15] 1A is a schematic diagram of an image forming apparatus according to one embodiment of the present invention, and FIGS. 1B and 1C are schematic diagrams showing an embodiment in which a plurality of light-emitting units of an exposure light source are arranged on a long substrate. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Example 1] Examples of light-emitting devices according to the present embodiment will be described with reference to the drawings. Note that the following embodiments are merely examples of the present embodiment, and the numerical values, shapes, materials, components, arrangements and connection forms of the components, etc., do not limit the present embodiment.

[0011] In the following description, a light-emitting device 040 will be described as an example of a light-emitting apparatus. This light-emitting device 040 is a chip including a light-emitting element and a circuit for driving the light-emitting element. Furthermore, an exposure head that irradiates light onto a photosensitive drum of a copier will be described as an example of a light-emitting module. The light-emitting module can be configured by arranging multiple light-emitting devices 040, and is not limited to an exposure head.

[0012] In the following, an OLED will be described as an example of a light-emitting element, but the present disclosure is not limited to OLEDs and can be applied to current-driven light-emitting devices in general, such as inorganic LEDs.

[0013] Fig. 1(a) is a perspective view of an example of a photosensitive drum 001 and an OLED-PH006 (exposure head) of an image forming apparatus, and Fig. 1(b) is a cross-sectional view of an example of the photosensitive drum 001 and an OLED-PH006.

[0014] 1, the OLED-PH006 is fixed by a fixing member (not shown) at a position facing the surface of the photosensitive drum 001. The OLED-PH006 has a light-emitting device 040 that emits light and a printed circuit board 022 on which the light-emitting device 040 is mounted. The OLED-PH006 also has a rod lens array 023 that focuses (focuses) the light emitted from the light-emitting device 040 on the photosensitive drum 001, and a housing 024 to which the rod lens array 023 and the printed circuit board 022 are fixed.

[0015] 2(a) and 2(b) are diagrams showing the mounting surfaces on one side and the other side of the printed circuit board 022 included in the OLED-PH006. FIG. 2(c) is an enlarged view of region V shown in FIG. 2(b). FIG. 2(a) shows the surface of the printed circuit board 022 opposite to the side on which the light-emitting devices are arranged, on which a connector (not shown) is arranged. The connector may be connected to a control signal cable from the image controller and a power cable from the power supply. The control signal cable may include, for example, at least one of a chip select signal line, a clock signal line, an image data signal line, a line synchronization signal line, and a communication signal line.

[0016] FIG. 2(b) shows the surface of the printed circuit board 022 opposite to the surface on which the light-emitting devices are arranged. As shown in FIG. 2(b), 17 light-emitting devices 040 are mounted on the printed circuit board 022 in a staggered arrangement in two rows. Each light-emitting device 040 has 872 light-emitting elements 250 arranged in its longitudinal direction (first direction) at a predetermined resolution pitch. Each light-emitting device 040 has four light-emitting elements 250 arranged in its lateral direction (second direction) at a predetermined pitch. That is, in each light-emitting device 040, the light-emitting elements 250 are arranged two-dimensionally (in multiple rows and multiple columns). The four light-emitting elements 250 arranged in the lateral direction form the same pixel by multiple exposure. The first and second directions are orthogonal to each other in a plan view of the light-emitting device.

[0017] In this embodiment, the resolution pitch of the light-emitting device 040 can be, for example, 1200 dpi (approximately 21.16 μm). The distance from one end to the other end in the longitudinal direction of the light-emitting elements 250 of each light-emitting device 040 (arrangement pitch) is, for example, approximately 18.451 mm. Here, the longitudinal arrangement pitch of the light-emitting elements refers to, for example, the distance in the longitudinal direction from the end of the first electrode of a light-emitting element to the end of the first electrode of a light-emitting element adjacent to that light-emitting element.

[0018] That is, for example, the LED-PH006 has a total of 14,824 light-emitting elements 250 in the longitudinal direction, which enables exposure processing corresponding to an image width in the longitudinal direction of approximately 315 mm (≒ approximately 18.5 mm × 17 chips). Furthermore, in the transverse direction of the light-emitting device 040, the arrangement pitch L1 between the light-emitting elements 250 of adjacent light-emitting devices 040 is approximately 350 μm. By reducing the arrangement pitch L1, the light-emitting elements can be positioned at the center of the lens, thereby improving the light utilization efficiency of the light-emitting device 040. This arrangement pitch L1 is set taking into account various variations, such as variations in the mounting equipment (die bonder) and variations in the light-emitting element manufacturing process.

[0019] Furthermore, adjacent light-emitting devices 040 in the second direction may be arranged such that their light-emitting elements 250 overlap in the first direction. During the mounting process of the light-emitting devices 040, misalignment may occur, resulting in misalignment of the light irradiated on the photosensitive drum 001 at the boundary between the light-emitting devices 040, resulting in shading variations and image streaks. However, by arranging the light-emitting elements 250 of adjacent light-emitting devices 040 in the second direction so that they overlap in the first direction, the boundaries between the light-emitting element rows become unclear, thereby preventing shading variations and image streaks due to misalignment of the irradiated light. By calculating the amount of overlap from the maximum amount of mounting variation in the mounting apparatus (die bonder) and setting it to an amount that prevents gaps from forming between the light-emitting elements 250 of adjacent light-emitting devices 040 in the short direction, shading variations and image streaks due to misalignment of the irradiated light can be more effectively prevented.

[0020] FIG. 3 is a cross-sectional view showing an example of a light-emitting element and a transistor connected to the light-emitting element. A transistor is an example of an active element. FIG. 3 shows a light-emitting element 250 and a transistor 314. A drive circuit for driving the light-emitting element 250 has, for example, a transistor 314 connected to the light-emitting element 250, as shown in FIG. 3. The transistor 314 disposed on a silicon substrate 310 is composed of a transistor gate 313, a transistor drain 312, and a transistor source 311. Here, an example of a MOSFET transistor having an active layer on a single-crystal silicon substrate is shown.

[0021] There are wirings 117 made up of a plurality of contact plugs 315_1 to 315_4 and a plurality of metal layers 316_1 to 316_4 that electrically connect the drain 112 of the transistor and the light emitting element 250, and insulating layers 319 are provided between the wirings. Although the insulating layer 319 is illustrated as a single layer in Fig. 3, it may have a laminated structure made up of multiple layers.

[0022] The light-emitting element 250 is composed of a first electrode 316-4, an organic compound layer 321 having a light-emitting layer, and a second electrode 322, with two adjacent first electrodes 316-4 separated by an insulating layer. While FIG. 3 illustrates the organic compound layer as a single layer, the organic compound layer 321 may be composed of multiple layers. In the light-emitting element 250, the second electrode 322 is a transparent electrode, allowing light from the organic compound layer 321 to be extracted to the outside. A protective layer 325 is provided on the second electrode 322 to reduce deterioration of the light-emitting element. The second electrode 322 of the light-emitting element 250 is shared by multiple light-emitting elements 250 and serves as a common electrode.

[0023] Between each light-emitting element 250, a structure 327 having a large step directly below the organic compound layer 321 also thins the organic compound layer 321, electrically isolating the two light-emitting elements 250. The second electrodes 322 are electrically connected and serve as a common electrode for the plurality of light-emitting elements 250. In the light-emitting device 040, combinations of the light-emitting elements 250 and drive circuits having transistors 314 are repeatedly arranged in the row and column directions.

[0024] The method of electrical connection with the electrodes (source electrode, drain electrode) included in the transistor is not limited to the mode shown in Fig. 3. Either the source electrode or the drain electrode of the transistor may be electrically connected in accordance with the polarity of the first electrode 316_4 or the polarity of the transistor.

[0025] Furthermore, the transistor is not limited to a transistor using a single-crystal silicon wafer, but may be a thin-film transistor (TFT) having an active layer on an insulating surface of a substrate. Examples of the active layer include single-crystal silicon, amorphous silicon, non-single-crystal silicon such as microcrystalline silicon, and non-single-crystal oxide semiconductors such as indium zinc oxide and indium gallium zinc oxide. Using a transistor using a single-crystal silicon wafer as the transistor allows for miniaturization of the driving circuit and speed-up of circuits having transistors.

[0026] 4 is a diagram showing an example of a circuit block diagram of a light-emitting device 100 as a light-emitting device 040 according to this embodiment. The light-emitting device 100 has an input interface circuit 108, a register 101, a reference current generation unit 110, a programmable current source 111, a bias current source group 112, a current control circuit 113, and a pixel drive circuit 114. The horizontal scanning circuit 115 has a data retention circuit 117 and a shift register 116. The input interface circuit 108 receives mode information for accessing the power supply and registers and information related to image data from an external interface, and outputs data signals to the register 101 and the horizontal scanning circuit 115.

[0027] The programmable current source 111 uses the output current of the reference current generation unit 110 as a reference and outputs a current corresponding to the digital value supplied from the register 101 to the bias current source group. The drive current of the pixel drive circuit 114 is controlled by the setting value of the register 101. The bias current source group 112 supplies an output current corresponding to the setting value set in the register 101 to the current control circuit 113. The current control circuit 113 generates a bias voltage for the pixel drive circuit 114.

[0028] The pixel drive circuit 114 is connected to the light-emitting elements, and the drive current is determined by the bias voltage supplied from the current control circuit 113. The pixel drive circuit 114 also controls whether the light-emitting elements emit light or not based on a signal supplied from the data holding circuit 117. The pixel drive circuit 114 has a plurality of drive circuits, each of which drives a corresponding light-emitting element among the plurality of light-emitting elements.

[0029] As shown in Figure 5, the light-emitting element drive circuit 332 has a first transistor 330 and a second transistor 331 connected in series. For the sake of explanation, it is assumed that all transistors have substantially the same size. The bias current source group 112 is made up of transistors M0 to Mi. The current control circuit is made up of transistors M1a to Mia and buffers B1 to Bi connected between the gate and drain terminals of the transistors M1a to Mia.

[0030] The pixel driving circuit 114 has a first group of transistors M11 to Mik and a second group of transistors M111 to Mi1k, and each transistor M111 to Mi1k of the second transistor group is connected in series with a corresponding light emitting element O11 to Oik. The current control circuit 113 and the pixel driving circuit 114 are divided into first circuit blocks 220 to 32i.

[0031] The output current I of the programmable current source 111 out is connected to the drain terminal of the transistor M0 of the bias current source group 112. The transistor M0 is diode-connected, and a voltage Vbn determined by the current Iout is commonly applied to the gates of the transistors M0 to Mi. i I out The same current flows.

[0032] In the first circuit block 220, the drain terminal of transistor M1a, which constitutes the current control circuit 113, is connected in series with the drain terminal of transistor M1. The gate terminal of transistor M1a is connected to the drain terminal via buffer B1. Buffer B1 is a voltage buffer with a gain of 1, and serves to absorb fluctuations in the gate potential of the first group of transistors M11 to M1k caused by the light emission control operation of the drive circuit.

[0033] The transistor M1a is diode-connected via the buffer B1, and the gate potential is the voltage V determined by the current I1. bp1 is applied in common to the gates of the first transistors M11 to M1k. The gate-source voltages of the first transistors M11 to M1k are equal, and the same driving current I 11 ~I 1k The first transistor functions as a constant current source.

[0034] Whether or not a current is supplied to the light-emitting elements is controlled by applying a drive voltage to the gates of the second transistors M111 to M11k from the data holding circuit 117. The second transistors function as switches.

[0035] When the pixel drive circuit 332 is affected by power supply fluctuations, the current driving the light-emitting elements changes, resulting in unevenness in the output image of the image forming apparatus. By arranging the transistor M0 and the transistors M1 to Mi close to each other to form a current mirror circuit configuration, the configuration is less susceptible to fluctuations in the power supply line, so adopting the circuit configuration of this embodiment is advantageous in reducing unevenness. Similarly, by arranging the transistor M1a and the first transistors M11 to M1k close to each other to form a current mirror circuit configuration, the configuration is advantageous in reducing unevenness.

[0036] Similarly, the light emitting elements O21 to O2k are driven to emit light by the first transistors M21 to M2k and second transistors M211 to M21k, and the light emitting elements Oi1 to Oik are driven to emit light by the first transistors Mi1 to Mik and second transistors Mi11 to Mi1k.

[0037] In this embodiment, the transistor sizes are substantially the same, but the transistor sizes may be adjustable by the register 101. If the transistor sizes of the transistors M1 to Mi in the bias current source group 112 are adjusted by register settings, the mirror ratio to the transistor M0 changes, allowing for coarse adjustment of the current in the drive circuit. Similarly, if the transistor sizes of the transistors M1a to Mia in the current control circuit 113 can be adjusted by register settings, the current in the drive circuit can be coarsely adjusted.

[0038] The light-emitting device of this embodiment will be further described below.

[0039] Fig. 6 is a diagram further illustrating the light-emitting device 100 of Fig. 4. Fig. 6 is an example of a planar layout diagram of the circuit blocks of the light-emitting device 100, and is a diagram illustrating the layout position of the capacitive element 400. Fig. 6 extracts and explains the configuration necessary to explain the layout position of the capacitive element 400 from the circuit blocks shown in Fig. 4.

[0040] Light-emitting device 100 is a rectangular device having long and short sides as the ends of a chip. If the direction in which the long sides extend is a first direction and the direction in which the short sides extend is a second direction, then first side 401 and second side 402 extend along the first direction. The chip typically includes a silicon semiconductor substrate and a wiring layer disposed so as to overlap the semiconductor substrate.

[0041] The pixel driving circuit 114 is disposed between the first side 401 and the second side 402. The pixel driving circuit 114 is a circuit for driving the light emitting elements 250 arranged in the matrix described with reference to FIGS. 2 and 3. Because the periphery of the light emitting elements 250 disposed on the upper layer of the pixel driving circuit 114 is sealed with a sealing material, the light emitting elements 250 need to be disposed further inside the light emitting device 100. Accordingly, the pixel driving circuit 114 is also disposed further inside the light emitting device 100.

[0042] A pad 403 is arranged as the input unit interface 108 along the first direction between the first side 401 and the pixel driving circuit 114. At least one pad 403 is arranged. The pad 403 is connected to a terminal provided outside the light-emitting device 250. Typically, a bonding pad and a bonding wire made of gold or the like are connected to the pad 403. Note that this is not a limitation, and a solder ball may be connected to the pad 403. The multiple pads 403 include pads used to send and receive signals to and from the outside of the light-emitting device 250, and pads to which a power supply voltage is supplied from the outside. Signals input from the outside to the pad 403 include a signal that controls the amount of current in the current adjustment circuit 404, a signal that controls the operation timing of the pixel driving circuit 114, and the like.

[0043] A capacitive element 400 is disposed between the second side 402 and the pixel driving circuit 114, and a current adjusting circuit 404 is disposed between the second side 402 and the pixel driving circuit 114 in the first direction.

[0044] The capacitor 400 is electrically connected between the first power supply voltage and the second power supply voltage of the current adjustment circuit 404. The capacitor 400 has two electrodes, one of which is connected to a node to which the first power supply voltage is supplied and the other of which is connected to a node to which the second power supply voltage is supplied.

[0045] 1 and 2, and may further include either or both of a programmable current source 111 and a bias current source 112. The current adjustment circuit 404 supplies a bias voltage to the pixel drive circuit 114.

[0046] Between the second side 402 and the pixel driving circuit 114, a plurality of capacitance elements 400 and a plurality of current adjustment circuits 404 are alternately arranged in the first direction.

[0047] At least one capacitance element 400 and one current adjustment circuit 404 are provided. As in the first embodiment, the capacitance element 400 is connected between the first power supply voltage and the second power supply voltage of the current adjustment circuit 404, where the first power supply voltage is PVDD and the second power supply voltage is VSS.

[0048] Here, the first power supply voltage is PVDD in Figure 2, and the second power supply voltage is VSS in Figure 2. PVDD can be a voltage of about 3 V, and VSS can be a voltage of about 0 V. VSS can also be the ground voltage.

[0049] When the power supply voltage PVDD of the current adjustment circuit 404 fluctuates, for example, the gate-source voltage (Vgs) of the transistor M1a of the current control circuit 113 shown in Fig. 2 fluctuates, and the bias supplied to the current drive circuit also fluctuates accordingly. This causes the current flowing through the light-emitting element 250 to fluctuate, and the amount of light emitted by the light-emitting element 250 also fluctuates, causing unevenness in the light-emitting area (deteriorating image quality).

[0050] As in this embodiment, a capacitive element 400 is connected between PVDD and VSS to stabilize the power supply voltage of the current adjustment circuit 404. This makes it possible to supply a stable power supply voltage (bias voltage) to the pixel drive circuit 114, thereby suppressing the above-mentioned deterioration in image quality.

[0051] Furthermore, arranging the capacitor 400 between the second side 402 and the pixel driving circuit 114 as in this embodiment allows the capacitor 400 to be arranged closer to the current source adjustment circuit 404 than arranging the capacitor 400 between the first side 401 and the pixel driving circuit 114. Therefore, it is more effective in suppressing fluctuations in at least one of the first power supply voltage and the second power supply voltage.

[0052] Therefore, placing the capacitance element 400 between the second side 402 and the pixel driving circuit 114 rather than between the first side 401 and the pixel driving circuit 114 allows the capacitance element 400 to be smaller, and as a result, the size of the light-emitting device 100 can be reduced.

[0053] This makes it possible to suppress an increase in the size of the light emitting device 100 while suppressing a deterioration in the characteristics of the light emitting device 100, thereby achieving both cost and performance.

[0054] In this embodiment, the first power supply voltage is PVDD and the second power supply voltage is VSS, but the present invention is not limited to these power supplies and other power supplies may be used.

[0055] The capacitor 400 has a first electrode connected to a node to which a first power supply voltage is supplied, and a second electrode connected to a node to which a second power supply voltage is supplied.

[0056] Furthermore, the capacitor element 400 can be an MIS (Metal-Insulator-Semiconductor) type capacitor. In this structure, one of a first electrode and a second electrode is provided inside the silicon substrate 310 shown in FIG. 3. The other of the first and second electrodes is provided as a metal electrode like the gate 315-1. This metal electrode is made of, for example, polysilicon. This metal electrode and one of the first and second electrodes provided inside the silicon substrate 310 are separated by a gate oxide film. In this way, an MIS type capacitor can be formed.

[0057] The capacitor 400 may be an MIM (Metal-Insulator-Metal) capacitor. The MIM capacitor may have a configuration in which a first metal electrode serving as a first electrode and a second metal electrode serving as a second electrode are formed in the same wiring layer. In this case, an insulating member is provided in the wiring layer between the first metal electrode and the second metal electrode formed in the same wiring layer. This allows the capacitor 400 to be formed. As another example of an MIM capacitor, the first metal electrode and the second metal electrode may be formed in different wiring layers. In this case, an insulating member is provided between the first metal electrode and the second metal electrode formed in different wiring layers. This allows the capacitor 400 to be formed.

[0058] Note that this embodiment is not limited to the arrangement of the capacitance element 400 and the current adjustment circuit 404 shown in FIG. 6 . That is, it is not limited to a configuration in which multiple capacitance elements 400 and multiple current adjustment circuits are alternately arranged. For example, the capacitance element 400 may be arranged to extend from the region of the third side 410 to the region of the side opposite the third side 410. That is, the multiple capacitance elements 400 shown in FIG. 6 are integrally formed as a single capacitance element region. The current adjustment circuit 404 may be arranged between this capacitance element 400 and the pixel driving circuit 114. That is, the current adjustment circuit 404 may be arranged between the capacitance element 400 and the pixel driving circuit 114. In such a configuration, it is also possible to form the capacitance element 400 over a wider region. This allows for a stable power supply voltage to be supplied.

[0059] [Example 2] Fig. 7 shows an example of a planar layout diagram of circuit blocks constituting the light-emitting device 100 of Fig. 1 in this embodiment. Differences from Example 1 will be mainly explained using Fig. 7. Items in Fig. 7 with the same reference numerals as those in Fig. 6 are the same as those explained in Example 1, and therefore explanations thereof will be omitted.

[0060] Capacitor elements 400_5 to 400_8 and current adjustment circuits 404_1 to 404_3 are arranged in a mixed manner in the first direction between the second side 402 and the pixel driving circuit 114. The current adjustment circuits 404_1 to 404_3 are a plurality of current adjustment circuits, each of which is a current adjustment circuit.

[0061] A current adjustment circuit 404-1, which is a first current adjustment circuit among the plurality of current adjustment circuits, is arranged between a capacitance element 400_5 that is a first capacitance element among the plurality of capacitance elements 400_5 to 400_8 and a capacitance element 400_6 that is a second capacitance element among the plurality of capacitance elements. Also, a current adjustment circuit 404_3, which is a second current adjustment circuit among the plurality of current adjustment circuits, is arranged between a capacitance element 400_7 that is a third capacitance element among the plurality of capacitance elements and a capacitance element 400_8 that is a fourth capacitance element among the plurality of capacitance elements.

[0062] At least one capacitance element 400 and one current adjustment circuit 404 are provided. As in the first embodiment, the capacitance element 400 is connected between the first power supply voltage and the second power supply voltage of the current adjustment circuit 404, where the first power supply voltage is PVDD and the second power supply voltage is VSS.

[0063] This provides the effect of suppressing degradation in image quality as described in the first embodiment.

[0064] In this embodiment, the capacitive element 400 is disposed on the side of the current adjustment circuit 404. This makes it possible to effectively suppress fluctuations in at least one of the first power supply voltage PVDD and the second power supply voltage VSS supplied to the current adjustment circuit 404.

[0065] In this embodiment, as in the first embodiment described above, it is possible to suppress deterioration in the characteristics of the light-emitting device 100 without increasing the size of the light-emitting device 100, thereby achieving both cost and performance.

[0066] In this embodiment, the first power supply voltage is PVDD and the second power supply voltage is VSS, but the present invention is not limited to these power supplies and other power supplies may be used.

[0067] Furthermore, in this embodiment, capacitive elements 400_1 to 400_4 are further arranged. These capacitive elements 400_1 to 400_4 are arranged between the first side 401 and the pixel driving circuit 114. The capacitive elements 400_1 to 400_4 arranged on the first side 401 side are arranged in a dead space where no circuit elements are arranged. These capacitive elements are also connected to the first power supply voltage PVDD and the second power supply voltage VSS. At least one of the capacitive elements 400_1 to 400_4 is a fifth capacitive element provided between the first side 401 and the light-emitting region. Furthermore, of the capacitive elements 400_1 to 400_4 provided between the first side 401 and the pixel driving circuit 114, the capacitive element 400_1 is arranged between the third side 410 and the capacitive element 400_2. Furthermore, the capacitance element 400_4 is disposed between the side (fourth side) opposite to the third side 410 and the capacitance element 400_3. If the capacitance element 400_1 is defined as a fifth capacitance element, at least one of the capacitance elements 400_2 to 400_4 is a sixth capacitance element located between the fifth capacitance element and the side (fourth side) opposite to the third side 410. With this configuration, the capacitance value of the capacitance element 400 can be further increased, and at least one of the first power supply voltage and the second power supply voltage can be more suitably stabilized.

[0068] [Example 3] Fig. 8 shows an example of a planar layout diagram of circuit blocks constituting the light-emitting device 100 of Fig. 1 in this embodiment. Differences from Example 2 will be mainly explained using Fig. 8. Items in Fig. 8 with the same reference numerals as those in Fig. 6 are the same as those explained in Example 1, and therefore explanations thereof will be omitted.

[0069] In this embodiment, a capacitance element 400 is arranged between the second side 402 and the pixel driving circuit 114, and a capacitance element 400 is also arranged between the first side 401 and the pixel driving circuit 114. The capacitance elements 400_1 to 400_4 arranged on the first side 401 side are arranged in a dead space where no circuit elements are arranged.

[0070] The metal wiring 700 is a wiring that functions as a moisture-resistant ring. In this embodiment, the metal wiring 700 is arranged so as to surround the entire periphery of the light-emitting device 100 in a plan view of the light-emitting region (a plan view of the light-emitting device). This configuration is not limited to this, and a portion of the metal wiring 700 may be cut. In a plan view of the light-emitting region (light-emitting device), the metal wiring 700 includes a first portion arranged along the first side 401, a second portion 700-1 arranged along the second side 402, and a third portion 700-2 arranged along the third side 410. The first portion includes a first region 700-3 that is spaced a first distance D1 from the first side 401 in the second direction, and a second region 700-4 that is spaced a second distance D2 from the first side 401 in the second direction that is longer than the first distance D1. A capacitive element 400_1, which is a fifth capacitive element, is arranged in a region between the first region 700-3 and the light-emitting region, and between the second region 700-4 and the third side 410. At least one of the capacitive element 400_3 and the capacitive element 400_4 arranged between the side (fourth side) opposite the third side 410 and the second region 700-4 is a sixth capacitive element.

[0071] The capacitive element 400 is electrically connected between a first power supply voltage and a second power supply voltage, and the first power supply voltage and the second power supply voltage are supplied to a current adjustment circuit 404 .

[0072] The layout area of ​​the capacitance elements 400 (total of 400_5 to 400_8) arranged between the second side 402 and the pixel driving circuit 114 is larger than that of the capacitance elements (total of 400_1 to 400_4) arranged between the first side 401 and the pixel driving circuit 114.

[0073] By adopting the configuration described in this embodiment, the capacitance element 400 connected between the first power supply voltage and the second power supply voltage can be made larger than in Example 2, and the power supply supplied to the current adjustment circuit 404 can be made more stable.

[0074] As a result, by arranging the capacitive element 400 to effectively utilize the dead space, it is possible to suppress an increase in chip size and to suppress deterioration of the characteristics of the light emitting device 100.

[0075] Also, the second region 700-4 that becomes the recess of the moisture-resistant ring along the first side 401 is shown in one place in FIG. 8, but more recesses may be provided.

[0076] In the configuration of FIG. 8, the capacitance element 400 is connected between the first power supply voltage and the second power supply voltage supplied to the current adjustment circuit 404, and the power supply supplied to the current adjustment circuit 404 can be made more stable.

[0077] [Example 4] A fourth embodiment of the light-emitting device according to the present invention will now be described in detail. Only the outline and differences from the previous embodiments will be described, and the same or similar parts will be designated by the same reference numerals and will not be described again.

[0078] FIG. 9 is an example of a plan view of the circuit blocks of the light emitting device 100 of FIG. 1 arranged on the device.

[0079] A horizontal scanning circuit 115 is disposed between the first side 401 and the pixel driving circuit 114 in the first direction.

[0080] The register 109 is disposed between the recesses 700 on the first side 401 .

[0081] A protection element 800 for protecting the internal circuit is disposed near the pad 403, and an external signal input to the pad 403 passes through the protection element 800 before being supplied to the internal circuit.

[0082] A pixel bias source 113 is disposed in the first direction between the second side 402 and the pixel drive circuit 114 .

[0083] A reference current source 110 , a programmable current source 111 and a pixel bias current source 112 are arranged between the second side 402 and a pixel bias source 113 .

[0084] Capacitor elements 400_1 and 400_2 are arranged between or adjacent to the reference current source 110, the programmable current source 111, and the pixel bias current source 112.

[0085] A first power supply voltage and a second power supply voltage are supplied to the reference current source 110, the programmable current source 111, and the pixel bias current source 112, and the capacitance elements 400_1 and 400_2 are electrically connected between the first power supply voltage and the second power supply voltage, thereby suppressing fluctuations in the power supplies supplied to the reference current source 110, the programmable current source 111, and the pixel bias current source 112, and thereby suppressing deterioration in image quality.

[0086] The pixel drive circuit is supplied with a first power supply voltage and a third power supply, and the first, second, and third power supplies are different voltages.

[0087] Although not shown, a capacitance element may be connected between the second power supply voltage and the third power supply voltage.

[0088] In this embodiment, the first power supply voltage, the second power supply voltage, and the third power supply voltage are PVDD, VSS, and VCAT shown in FIG. 2, but are not limited to these power supplies.

[0089] The light output of a single OLED-based light-emitting element is not sufficiently high for use in an optical writing device in an image forming apparatus. If a large current is passed through the light-emitting element to increase the light output, the forward voltage of the light-emitting element increases. Therefore, the light-emitting element and the drive circuit connected thereto may require a potential difference greater than the first power supply voltage PVDD and the second power supply voltage VSS. In this embodiment, the light-emitting element and the drive circuit connected thereto are connected to the first power supply voltage PVDD and the third power supply VCAT. Since |PVDD-VSS|<|PVDD-VCAT|, the breakdown voltage of the transistors constituting the pixel drive circuit 114 is typically higher than that of the capacitor element 400.

[0090] In this embodiment, since the capacitance element 400 cannot be placed between the first power supply voltage and the third power supply from the viewpoint of voltage resistance, capacitance elements are electrically connected between the first power supply voltage and the second power supply voltage, and between the second power supply voltage and the third power supply.

[0091] If the voltage difference between the first power supply voltage and the third power supply voltage is less than the withstand voltage of the capacitive element 400, the capacitive element 400 may be connected between the first power supply voltage and the third power supply voltage.

[0092] At least one of the reference current source 110, the programmable current source 111, the pixel bias current source 112, the pixel drive circuit 114, the pixel bias source 113, and the capacitance element 400 has an area that is partially shielded from light by wiring on an upper layer.

[0093] Here, the upper layer refers to the upper side (the side where the light emitting element 250 is arranged) of 315_4 shown in FIG. 3, and the wiring that shields the circuit block from light is the wiring in the same layer as 316_4 shown in FIG.

[0094] When forming the light-emitting element 250 by vapor deposition, at least a portion of an aperture mask for vapor deposition is abutted against the substrate. To prevent vapor deposition blurring that occurs during the vapor deposition process, a certain distance or more is required between the light-emitting element 250 and the second side 402. In this embodiment, the light-emitting element 250 is formed so as to overlap the pixel driving circuit 114 in plan view.

[0095] As a result, a dead space is generated between the second side 402 and the pixel driving circuit 114, and the area of ​​this dead space is approximately 0.01 mm 2 from 2.4 mm 2 The capacitor element 400 is disposed there.

[0096] This embodiment is configured to utilize dead space to suppress image quality degradation due to power supply fluctuations while suppressing an increase in the size of the light-emitting device 100. When the total electrode area of ​​the light-emitting elements 250 (≈ pixel drive circuits 114) arranged in the row and column direction is S, the total arrangement area of ​​the capacitance elements 400 arranged between the second side 402 and the pixel drive circuits 114 is A, and the area of ​​the light-emitting device 100 is 1, then: 0.006 <A<S<1.0 The ratio is:

[0097] By adopting the configuration described in this embodiment, it is possible to reduce the size of a light-emitting device with a stable power supply voltage and guaranteed characteristics, and it is possible to obtain the effect of manufacturing at low cost.

[0098] [Example 5] 10 is a schematic diagram illustrating an example of a display device according to this embodiment. The display device 1000 may include a touch panel 1003, a display panel 1005, a frame 1006, a circuit board 1007, and a battery 1008 between an upper cover 1001 and a lower cover 1009. The touch panel 1003 and the display panel 1005 are connected by flexible printed circuits FPCs 1002 and 1004. Transistors are printed on the circuit board 1007. The battery 1008 may not be provided if the display device is not a portable device, and may be provided in a different position even if the display device is a portable device.

[0099] The display device according to this embodiment may have color filters having red, green, and blue colors, which may be arranged in a delta arrangement.

[0100] The display device according to the present embodiment may be used as a display unit of a mobile terminal. In this case, the display device may have both a display function and an operation function. Examples of the mobile terminal include a mobile phone such as a smartphone, a tablet, and a head-mounted display.

[0101] The display device according to this embodiment may be used as a display unit of an imaging device having an optical unit with a plurality of lenses and an imaging element that receives light that has passed through the optical unit. The imaging device may have a display unit that displays information acquired by the imaging element. The display unit may be a display unit exposed to the outside of the imaging device or a display unit disposed within a viewfinder. The imaging device may be a digital camera or a digital video camera.

[0102] 11(a) is a schematic diagram showing an example of an imaging device according to this embodiment. The imaging device 1100 may have a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The viewfinder 1101 may have a display device according to this embodiment. In this case, the display device may display not only an image to be captured, but also environmental information, imaging instructions, and the like. The environmental information may include the intensity of external light, the direction of external light, the speed at which the subject is moving, the possibility that the subject will be blocked by an obstruction, and the like.

[0103] Since the optimum timing for capturing an image is very short, it is better to display information as soon as possible. Therefore, it is preferable to use a display device using the organic light-emitting element of the present invention. This is because the organic light-emitting element has a fast response speed. A display device using an organic light-emitting element can be used more preferably than a liquid crystal display device, which requires a high display speed.

[0104] The imaging device 1100 has an optical section (not shown). The optical section has multiple lenses, which form an image on an imaging element housed in a housing 1104. The focus of the multiple lenses can be adjusted by adjusting their relative positions. This operation can also be performed automatically. The imaging device may also be called a photoelectric conversion device. Instead of sequentially capturing images, the photoelectric conversion device can include an imaging method that detects the difference from the previous image, or a method of cutting out an image from a constantly recorded image, etc.

[0105] FIG. 11(b) is a schematic diagram showing an example of an electronic device according to this embodiment. The electronic device 1200 has a display unit 1201, an operation unit 1202, and a housing 1203. The housing 1203 may have a circuit, a printed circuit board having the circuit, a battery, and a communication unit. The operation unit 1202 may be a button or a touch panel type reaction unit. The operation unit may be a biometric recognition unit that recognizes a fingerprint to perform operations such as unlocking. An electronic device having a communication unit can also be called a communication device. The electronic device may further have a camera function by including a lens and an image sensor. An image captured by the camera function is displayed on the display unit. Examples of the electronic device include a smartphone and a laptop computer.

[0106] 12A and 12B are schematic diagrams illustrating an example of a display device according to this embodiment. Fig. 12A shows a display device such as a television monitor or a PC monitor. The display device 1300 has a frame 1301 and a display unit 1302. The light-emitting device according to this embodiment may be used in the display unit 1302.

[0107] It has a frame 1301 and a base 1303 that supports a display unit 1302. The base 1303 is not limited to the form shown in Fig. 12(a). The bottom side of the frame 1301 may also serve as the base.

[0108] The frame 1301 and the display unit 1302 may be curved. The radius of curvature may be 5000 mm or more and 6000 mm or less.

[0109] FIG. 12(b) is a schematic diagram illustrating another example of a display device according to this embodiment. The display device 1310 in FIG. 12(b) is configured to be bendable, and is a so-called foldable display device. The display device 1310 has a first display unit 1311, a second display unit 1312, a housing 1313, and a bending point 1314. The first display unit 1311 and the second display unit 1312 may include a light-emitting device according to this embodiment. The first display unit 1311 and the second display unit 1312 may be a single, seamless display unit. The first display unit 1311 and the second display unit 1312 can be separated by the bending point. The first display unit 1311 and the second display unit 1312 may each display different images, or the first and second display units may display a single image.

[0110] FIG. 13(a) is a schematic diagram showing an example of a lighting device according to this embodiment. The lighting device 1400 may include a housing 1401, a light source 1402, a circuit board 1403, an optical film 1404, and a light diffusion unit 1405. The light source may include an organic light-emitting element according to this embodiment. The optical filter may be a filter that improves the color rendering of the light source. The light diffusion unit can effectively diffuse light from the light source, such as for illumination, and deliver the light over a wide area. The optical filter and the light diffusion unit may be provided on the light output side of the lighting. If necessary, a cover may be provided on the outermost part.

[0111] The lighting device is, for example, a device for illuminating a room. The lighting device may emit white, daylight white, or any other color from blue to red. It may have a dimming circuit for dimming these colors. The lighting device may have the organic light-emitting element of the present invention and a power supply circuit connected thereto. The power supply circuit is a circuit for converting AC voltage to DC voltage. Furthermore, white has a color temperature of 4200K, and daylight white has a color temperature of 5000K. The lighting device may have a color filter.

[0112] The lighting device according to this embodiment may also include a heat dissipation unit, which dissipates heat from within the device to the outside, and may be made of a material such as a metal with a high specific heat capacity or liquid silicon.

[0113] 13(b) is a schematic diagram of an automobile, which is an example of a moving body according to this embodiment. The automobile has tail lamps, which are an example of lighting fixtures. The automobile 1500 has tail lamps 1501, and may be configured to turn on the tail lamps when braking or the like is performed.

[0114] A tail lamp 1501 may include an organic light-emitting element according to this embodiment. The tail lamp may include a protective member for protecting the organic EL element. The protective member may be made of any material as long as it has a certain degree of strength and is transparent, but it is preferably made of polycarbonate or the like. Polycarbonate may be mixed with a furandicarboxylic acid derivative, an acrylonitrile derivative, or the like.

[0115] An automobile 1500 may have a body 1503 and a window 1502 attached thereto. The window may be a transparent display as long as it is not a window for checking the front and rear of the automobile. The transparent display may have an organic light-emitting element according to this embodiment. In this case, constituent materials of the electrodes and the like of the organic light-emitting element are made of transparent materials.

[0116] The moving body according to this embodiment may be a ship, an aircraft, a drone, or the like. The moving body may have a body and a lighting device provided on the body. The lighting device may emit light to indicate the position of the body. The lighting device has the organic light-emitting element according to this embodiment.

[0117] An application example of the display device of each of the above-described embodiments will be described with reference to Fig. 14. The display device can be applied to a system that can be attached as a wearable device, such as smart glasses, an HMD, or a smart contact lens. An image capturing and displaying device used in such an application example includes an image capturing device capable of photoelectrically converting visible light and a displaying device capable of emitting visible light.

[0118] 14(a) illustrates glasses 1600 (smart glasses) according to one application example. An imaging device 1602 such as a CMOS sensor or SPAD is provided on the front side of a lens 1601 of the glasses 1600. Furthermore, a display device according to any of the above-described embodiments is provided on the back side of the lens 1601.

[0119] The glasses 1600 further include a control device 1603. The control device 1603 functions as a power source that supplies power to the image capture device 1602 and the display device according to each embodiment. The control device 1603 also controls the operations of the image capture device 1602 and the display device. The lens 1601 is formed with an optical system for focusing light onto the image capture device 1602.

[0120] FIG. 14(b) illustrates glasses 1610 (smart glasses) according to one application example. The glasses 1610 include a control device 1612. The control device 1612 is equipped with an imaging device equivalent to the imaging device 1602 and a display device. A lens 1611 is formed with an optical system for projecting light emitted by the display device in the control device 1612, and an image is projected onto the lens 1611. The control device 1612 functions as a power source for supplying power to the imaging device and the display device and controls the operation of the imaging device and the display device. The control device may also include a gaze detection unit for detecting the wearer's gaze. Infrared light may be used for gaze detection. The infrared light emitter emits infrared light toward the eyeball of a user gazing at a displayed image. An imaging unit with a light receiving element detects the emitted infrared light reflected from the eyeball, thereby obtaining an image of the eyeball. A reduction unit for reducing light from the infrared light emitter to the display unit in a planar view reduces degradation of image quality.

[0121] The gaze of the user relative to the displayed image is detected from an image of the eyeball obtained by capturing infrared light. Any known method can be used for gaze detection using an image of the eyeball. One example is a gaze detection method based on the Purkinje image formed by reflection of irradiated light on the cornea.

[0122] More specifically, gaze detection processing is performed based on the pupil-corneal reflex method, which calculates a gaze vector representing the direction (rotation angle) of the eyeball based on the pupil image and Purkinje image included in the captured image of the eyeball, thereby detecting the user's gaze.

[0123] A display device according to an embodiment of the present invention may have an imaging device having a light receiving element, and may control the image displayed on the display device based on information about the user's line of sight from the imaging device.

[0124] Specifically, the display device determines a first display area on which the user gazes and a second display area other than the first display area based on the line-of-sight information. The first display area and the second display area may be determined by a control device of the display device, or may be determined by an external control device and received. In the display area of ​​the display device, the display resolution of the first display area may be controlled to be higher than the display resolution of the second display area. In other words, the resolution of the second display area may be lower than that of the first field of view area.

[0125] The display area includes a first display area and a second display area different from the first display area, and a high-priority area is determined from the first display area and the second display area based on line-of-sight information. The first field of view area and the second field of view area may be determined by a control device of the display device, or may be determined by an external control device and received. The resolution of the high-priority area may be controlled to be higher than the resolution of areas other than the high-priority area. In other words, the resolution of an area with a relatively low priority may be lowered.

[0126] Note that AI may be used to determine the first display area and the area with high priority. The AI ​​may be a model configured to estimate the angle of gaze and the distance to an object in the line of sight from the image of the eyeball, using as training data an image of the eyeball and the actual direction in which the eyeball in the image was looking. The AI ​​program may be included in the display device, the imaging device, or an external device. If included in the external device, it is transmitted to the display device via communication.

[0127] When display control is performed based on visual recognition detection, the smart glasses can be preferably applied to smart glasses that further include an imaging device for capturing images of the outside world. The smart glasses can display captured external information in real time.

[0128] Figure 15 shows an image forming apparatus according to one embodiment of the present invention. Figure 15(a) is a schematic diagram of an image forming apparatus 36 according to one embodiment of the present invention. The image forming apparatus has a photosensitive member, an exposure light source, a developing unit, a charging unit, a transfer unit, a transport roller, and a fixing unit.

[0129] Light 29 is irradiated from an exposure light source 28, and an electrostatic latent image is formed on the surface of the photosensitive member 27. This exposure light source has an organic light-emitting element according to the present invention. A developing unit 31 has toner and the like. A charging unit 30 charges the photosensitive member. A transfer device 32 transfers the developed image to a recording medium 34. A transport unit 33 transports the recording medium 34. The recording medium 34 is, for example, paper. A fixing unit 35 fixes the image formed on the recording medium.

[0130] 15(b) and 15(c) are schematic diagrams showing exposure light source 28 with multiple light-emitting units 38 arranged on a long substrate. 37 is a direction parallel to the axis of the photoconductor, and represents the column direction in which the organic light-emitting elements are arranged. This column direction is the same as the axis direction about which photoconductor 27 rotates. This direction can also be called the long axis direction of the photoconductor.

[0131] Figure 15(b) shows a configuration in which the light-emitting units are arranged along the longitudinal axis of the photoconductor. Figure 15(c) shows a different configuration from (b), in which the light-emitting units are arranged alternately in the column direction in the first and second columns. The first and second columns are arranged at different positions in the row direction.

[0132] The first column has a plurality of light-emitting units arranged at intervals. The second column has light-emitting units at positions corresponding to the intervals between the light-emitting units in the first column. That is, the plurality of light-emitting units are also arranged at intervals in the row direction.

[0133] The arrangement in FIG. 15(c) can also be described as a grid arrangement, a houndstooth arrangement, or a checkerboard pattern.

[0134] As described above, by using a device using the organic light-emitting element according to this embodiment, it is possible to provide a stable display with good image quality even over a long period of time.

[0135] The contents of the present disclosure include the following.

[0136] (Configuration 1) A light emitting device comprising: a first side extending in a first direction; a second side facing the first side and extending in the first direction; and a third side extending in a second direction that is perpendicular to the first direction; and the light emitting device is supplied with a first power supply voltage and a second power supply voltage having a value different from the first power supply voltage, a light-emitting region including a plurality of light-emitting elements arranged in a plurality of rows along the first direction and a plurality of drive circuits for driving corresponding light-emitting elements among the plurality of light-emitting elements; a plurality of pads arranged along the first direction between the first side and the light emitting region and connected to external terminals of the light emitting device; a capacitance element connected to a node to which the first power supply voltage is supplied and a node to which the second power supply voltage is supplied; The light-emitting device, wherein the capacitive element is disposed between the second side and the light-emitting region.

[0137] (Configuration 2) a current adjusting circuit that adjusts the amount of current output by the plurality of drive circuits; and a plurality of capacitance elements, each of which is the capacitance element; 2. The light-emitting device according to claim 1, wherein the current adjustment circuit is disposed between one of the plurality of capacitive elements and another of the plurality of capacitive elements.

[0138] (Configuration 3) 3. The light emitting device according to configuration 2, wherein the plurality of capacitive elements and the current adjusting circuit are arranged along the first direction.

[0139] (Configuration 4) a plurality of current regulation circuits, each of which is the current regulation circuit; a first current adjustment circuit of the plurality of current adjustment circuits is disposed between a first capacitance element of the plurality of capacitance elements and a second capacitance element of the plurality of capacitance elements; The light-emitting device described in configuration 2, characterized in that a second current adjustment circuit of the plurality of current adjustment circuits is arranged between a third capacitance element of the plurality of capacitance elements and a fourth capacitance element of the plurality of capacitance elements.

[0140] (Configuration 5) The light-emitting device according to configuration 4, wherein the plurality of capacitive elements are arranged along the first direction.

[0141] (Configuration 6) A light-emitting device described in any one of configurations 1 to 4, characterized in that, in addition to the capacitive element, a capacitive element connected to a node to which the first power supply voltage is supplied and a node to which the second power supply voltage is supplied is arranged between the first side and the light-emitting region.

[0142] (Configuration 7) The light-emitting device described in configuration 5, characterized in that, in addition to the capacitive element, a fifth capacitive element connected to a node to which the first power supply voltage is supplied and a node to which the second power supply voltage is supplied is arranged between the first side and the light-emitting region.

[0143] (Configuration 8) 8. The light emitting device according to configuration 7, wherein the fifth capacitive element and one of the plurality of pads are arranged along the first direction.

[0144] (Configuration 9) a metal wiring including, in a plan view of the light emitting region, a first portion arranged along the first side, a second portion arranged along the second side, and a third portion arranged along the third side; In the plan view, the first portion has a first region in which a distance from the first side in the second direction is a first distance, and a second region in which a distance from the first side in the second direction is a second distance longer than the first distance, The light-emitting device described in configuration 8, characterized in that the fifth capacitance element is arranged in a region between the first region and the light-emitting region, and between the second region and the third side.

[0145] (Configuration 10) The light-emitting device described in configuration 9, characterized in that, in addition to the capacitive element and the fifth capacitive element, a sixth capacitive element connected to a node to which the first power supply voltage is supplied and a node to which the second power supply voltage is supplied is arranged between a fourth side opposite the third side and the second region.

[0146] (Configuration 11) a protection element connected to one of the pads; 11. The light emitting device according to any one of configurations 1 to 10, wherein the protective element is disposed in a region between the first side and the light emitting region.

[0147] (Configuration 12) 12. The light emitting device according to configuration 11, wherein the protection element and the one pad are arranged along the first direction.

[0148] (Configuration 13) the first power supply voltage is supplied to one of the pads; 13. The light emitting device according to any one of configurations 1 to 12, wherein the second power supply voltage is supplied to another one of the plurality of pads.

[0149] (Configuration 14) 14. The light emitting device according to any one of configurations 1 to 13, wherein a control signal for controlling the plurality of drive circuits is input to one of the plurality of pads.

[0150] (Configuration 15) 15. The light emitting device according to any one of configurations 1 to 14, wherein the capacitive element is a MIS (Metal-Insulator-Semiconductor) type capacitor.

[0151] (Configuration 16) 15. The light emitting device according to any one of configurations 1 to 14, wherein the capacitive element is a MIM (Metal-Insulator-Metal) type capacitor.

[0152] (Configuration 17) The light-emitting device described in configuration 16, characterized in that a first metal electrode and a second metal electrode for forming the MIM type capacitance are formed in the same wiring layer, and an insulating member is arranged between the first metal electrode and the second metal electrode.

[0153] (Configuration 18) The light-emitting device described in configuration 16, characterized in that the first metal electrode and the second metal electrode for forming the MIM type capacitance are formed in different wiring layers, and an insulating member is arranged between the first metal electrode and the second metal electrode.

[0154] (Configuration 19) A light-emitting module in which a plurality of light-emitting devices, each of which is the light-emitting device according to any one of configurations 1 to 18, are arranged.

[0155] (Configuration 20) 20. The light emitting module according to embodiment 19, further comprising a lens array that focuses light output from the plurality of light emitting devices.

[0156] (Configuration 21) An electronic device comprising: a display unit having the light-emitting device according to any one of configurations 1 to 18; a housing in which the light-emitting device is provided; and a communication unit provided in the housing for communicating with the outside. [Explanation of symbols]

[0157] 100 Light-emitting devices 108 Input Interface 109 Registers 110 Reference current source 111 Programmable Current Source 112 Current source for pixel bias source 113 Pixel Bias Source 114 Pixel driving circuit 115 horizontal scanning circuit 220 First Block 221 Second Block 22i ith block 230 first transistor 231 Second Transistor 232 Drive Circuit 250 light-emitting elements 110 Semiconductor substrate 111 Source of transistor 114 112 drain of transistor 114 113 Gate of transistor 114 114 transistors 315_1, 315_2, 315_3, 315_4 contact plugs 316_1, 316_2, 316_3_316_4 Metal layer 319 Insulation layer between wiring 321 Organic compound layer with light-emitting layer 322 2nd electrode 325 Protective layer 400 Capacitor 401 First Side 402 Second Side 403 terminal 404 Current adjustment circuit 700 First side recess 800 Protection Elements

Claims

1. A light emitting device comprising: a first side extending in a first direction; a second side facing the first side and extending in the first direction; and a third side extending in a second direction that is perpendicular to the first direction; and the light emitting device is supplied with a first power supply voltage and a second power supply voltage having a value different from the first power supply voltage, a light-emitting region including a plurality of light-emitting elements arranged in a plurality of rows along the first direction and a plurality of drive circuits for driving corresponding light-emitting elements among the plurality of light-emitting elements; a plurality of pads arranged along the first direction between the first side and the light emitting region and connected to external terminals of the light emitting device; a capacitance element connected to a node to which the first power supply voltage is supplied and a node to which the second power supply voltage is supplied; The light-emitting device, wherein the capacitive element is disposed between the second side and the light-emitting region.

2. a current adjusting circuit that adjusts the amount of current output by the plurality of drive circuits; and a plurality of capacitance elements, each of which is the capacitance element; 2. The light emitting device according to claim 1, wherein the current adjusting circuit is disposed between one of the plurality of capacitive elements and another of the plurality of capacitive elements.

3. The light emitting device according to claim 2 , wherein the plurality of capacitive elements and the current adjusting circuit are arranged along the first direction.

4. a plurality of current regulation circuits, each of which is the current regulation circuit; a first current adjustment circuit among the plurality of current adjustment circuits is disposed between a first capacitance element among the plurality of capacitance elements and a second capacitance element among the plurality of capacitance elements; 3. The light-emitting device according to claim 2, wherein a second current adjustment circuit of the plurality of current adjustment circuits is disposed between a third capacitance element of the plurality of capacitance elements and a fourth capacitance element of the plurality of capacitance elements.

5. The light emitting device according to claim 4 , wherein the plurality of capacitive elements are arranged along the first direction.

6. 2. The light-emitting device according to claim 1, wherein, in addition to the capacitive element, a capacitive element connected to a node to which the first power supply voltage is supplied and a node to which the second power supply voltage is supplied is arranged between the first side and the light-emitting region.

7. The light-emitting device according to claim 5, characterized in that, in addition to the capacitive element, a fifth capacitive element connected to a node to which the first power supply voltage is supplied and a node to which the second power supply voltage is supplied is arranged between the first side and the light-emitting region.

8. 8. The light emitting device according to claim 7, wherein the fifth capacitive element and one of the plurality of pads are arranged along the first direction.

9. a metal wiring including, in a plan view of the light emitting region, a first portion arranged along the first side, a second portion arranged along the second side, and a third portion arranged along the third side; In the plan view, the first portion has a first region in which a distance from the first side in the second direction is a first distance, and a second region in which a distance from the first side in the second direction is a second distance that is longer than the first distance, 9. The light emitting device according to claim 8, wherein the fifth capacitance element is disposed in a region between the first region and the light emitting region, and between the second region and the third side.

10. The light-emitting device described in claim 9, characterized in that, apart from the capacitive element and the fifth capacitive element, a sixth capacitive element connected to a node to which the first power supply voltage is supplied and a node to which the second power supply voltage is supplied is arranged between a fourth side opposite the third side and the second region.

11. a protection element connected to one of the pads; 2. The light emitting device according to claim 1, wherein the protective element is disposed in a region between the first side and the light emitting region.

12. The light emitting device according to claim 11 , wherein the protection element and the one pad are arranged along the first direction.

13. the first power supply voltage is supplied to one of the pads; 2. The light emitting device according to claim 1, wherein the second power supply voltage is supplied to another one of the plurality of pads.

14. 2. The light emitting device according to claim 1, wherein a control signal for controlling the plurality of drive circuits is input to one of the plurality of pads.

15. 2. The light emitting device according to claim 1, wherein the capacitance element is a MIS (Metal-Insulator-Semiconductor) type capacitance.

16. 2. The light emitting device according to claim 1, wherein the capacitance element is a MIM (Metal-Insulator-Metal) type capacitance.

17. 17. The light-emitting device according to claim 16, wherein a first metal electrode and a second metal electrode for forming the MIM type capacitance are formed in the same wiring layer, and an insulating member is disposed between the first metal electrode and the second metal electrode.

18. 17. The light-emitting device according to claim 16, wherein a first metal electrode and a second metal electrode for forming the MIM type capacitance are formed in different wiring layers, and an insulating member is disposed between the first metal electrode and the second metal electrode.

19. A light-emitting module comprising a plurality of light-emitting devices, each of which is the light-emitting device according to any one of claims 1 to 18.

20. The light-emitting module according to claim 19 , further comprising a lens array that focuses light output from the plurality of light-emitting devices.

21. 19. An electronic device comprising: a display unit having a light-emitting device according to claim 1; a housing in which the light-emitting device is provided; and a communication unit provided in the housing for communicating with the outside.

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