Light-emitting devices, light-emitting modules, image forming apparatus, electronic equipment

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 including the light-emitting device. [Background Art]

[0002] Devices using an organic light emitting diode (OLED) as a light-emitting source have been proposed. Examples of such devices include displays (display devices) and optical writing devices (OLED-PH: OLED Print Head) for use in image forming apparatuses, which have been proposed. Since OLED-PH can have an OLED and a transistor for driving the OLED formed on the same substrate, it is advantageous for size reduction and cost reduction. In particular, when a silicon wafer is used as the substrate, the drive circuit can be formed finely, and as a result, higher density of OLEDs serving as light-emitting sources can be achieved. Accordingly, higher-definition image formation can be achieved.

[0003] Patent Document 1 discloses a light-emitting device in which the influence of light emission unevenness is reduced. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Publication No. 2022-162410 [Summary of the Invention] [Problems to be Solved by the Invention]

[0005] Along with the progress of size reduction of light-emitting devices, restrictions on the arrangement position and area of bypass capacitors (capacitance elements) connected to a power supply voltage to suppress fluctuations in the power supply voltage have been increasing. In order to ensure the characteristics of a light-emitting device, it is required to supply a stable power supply voltage to the light-emitting device and circuits mounted on the light-emitting device. Therefore, efficient arrangement of bypass capacitors (capacitance elements) that suppress power supply fluctuations is required.

[0006] Patent Document 1 did not consider the arrangement of such bypass capacitors (capacitive elements). [Means for solving the problem]

[0007] One aspect of the present invention is a light-emitting device comprising a first side extending in a first direction, a second side extending in the first direction opposite to the first side, and a third side extending in a second direction perpendicular to the first direction, and supplied with a first power supply voltage and a second power supply voltage having a value different from the first power supply voltage, wherein the light-emitting region has 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, and a plurality of pads arranged between the first side and the light-emitting region along the first direction and connected to terminals outside the light-emitting device, A current adjustment circuit that adjusts the amount of current output by the plurality of drive circuits, and a current supply to the current adjustment circuit The first power supply voltage is supplied. 1 Nodes and The current supplied to the aforementioned current adjustment circuit The second power supply voltage is supplied. 2nd node and the first node and the second node It comprises a connected capacitive element, The current adjustment circuit and The light-emitting device is characterized in that the capacitive element is arranged between the second side and the light-emitting region. [Effects of the Invention]

[0008] The present invention provides a light-emitting device that achieves efficient placement of bypass capacitors. This enables the supply of a stable power supply voltage to the light-emitting device and the circuits mounted on it. [Brief explanation of the drawing]

[0009] [Figure 1] Perspective and cross-sectional views of an example of a photosensitive drum and OLED-PH (exposure head) in an image forming apparatus. [Figure 2] A diagram showing the mounting surfaces on one side and the other side of the printed circuit board of the OLED-PH, and an enlarged view of area V. [Figure 3]Cross-sectional view of light-emitting elements according to Examples 1 to 4. [Figure 4] Substrate layout diagram of light-emitting devices according to Examples 1 to 4. [Figure 5] Circuit diagram of light-emitting devices according to Examples 1 to 4. [Figure 6] Substrate layout diagram of the light-emitting device according to Example 1. [Figure 7] Substrate layout diagram of the light-emitting device according to Example 2. [Figure 8] Substrate layout diagram of the light-emitting device according to Example 3. [Figure 9] Substrate layout diagram of the light-emitting device according to Example 4. [Figure 10] It is a schematic diagram illustrating an example of a display device according to an embodiment of the present invention. [Figure 11] (a) It is a schematic diagram illustrating an example of an imaging device according to an embodiment of the present invention. (b) It is a schematic diagram illustrating an example of an electronic device according to an embodiment of the present invention. [Figure 12] (a) It is a schematic diagram illustrating an example of a display device according to an embodiment of the present invention. (b) It is a schematic diagram illustrating an example of a bendable display device. [Figure 13] (a) It is a schematic diagram illustrating an example of a lighting device according to an embodiment of the present invention. (b) It is a schematic diagram illustrating an example of an automobile including a vehicle lamp according to an embodiment of the present invention. [Figure 14] (a) It is a schematic diagram illustrating an example of a wearable device according to an embodiment of the present invention. (b) It is a schematic diagram illustrating a form including an imaging device in an example of a wearable device according to an embodiment of the present invention. [Figure 15] (a) It is a schematic diagram of an image forming apparatus according to an embodiment of the present invention. (b) and (c) are schematic diagrams illustrating a form where a plurality of light-emitting portions of an exposure light source are arranged on an elongated substrate. DETAILED DESCRIPTION OF THE INVENTION

[0010] [Example 1] An example of the light-emitting device according to the present embodiment will be described with reference to the drawings. All of the following embodiments are examples of the present embodiment, and numerical values, shapes, materials, components, arrangement and connection forms of the components do not limit the present embodiment.

[0011] In the following description, a light-emitting device 040 is 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 that drives the light-emitting element. Further, as an example of a light-emitting module, an exposure head that irradiates light to a photosensitive drum of a copying machine will be described. The light-emitting module can have a configuration in which a plurality of light-emitting devices 040 are arranged, and is not limited to an exposure head.

[0012] In the following description, an OLED is taken as an example of the light-emitting element for explanation. The present disclosure is not limited to OLEDs, and can be applied to all current-driven light-emitting devices such as inorganic LEDs.

[0013] FIG. 1(a) is a perspective view of an example of a photosensitive drum 001 and an OLED-PH 006 (exposure head) of an image forming apparatus. FIG. 1(b) is a cross-sectional view of an example of the photosensitive drum 001 and the OLED-PH 006.

[0014] As shown in FIG. 1, the OLED-PH 006 is fixed at a position facing the surface of the photosensitive drum 001 by a fixing member (not shown). The OLED-PH 006 includes 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-PH 006 further includes a rod lens array 023 that forms an image (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] Figures 2(a) and 2(b) show the mounting surfaces of one side and the other side of the printed circuit board 022 of the OLED-PH006. Figure 2(c) is an enlarged view of area V shown in Figure 2(b). Figure 2(a) is the side of the printed circuit board 022 opposite to the side on which the light-emitting device is located, and a connector (not shown) is located there. 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] Figure 2(b) shows the side of the printed circuit board 022 opposite to the side where the light-emitting devices are located. As shown in Figure 2(b), 17 light-emitting devices 040 are mounted on the printed circuit board 022 in a staggered arrangement in two rows. Within each light-emitting device 040, 872 light-emitting elements 250 are arranged in its longitudinal direction (first direction) at a predetermined resolution pitch. Within each light-emitting device 040, 4 light-emitting elements 250 are arranged in its short direction (second direction) at a predetermined pitch. In other words, within each light-emitting device 040, the light-emitting elements 250 are arranged in two dimensions (multiple rows and multiple columns). The four light-emitting elements 250 arranged in the short direction are captured in the same image by multiple exposure. image This forms the first and second directions, which are orthogonal directions 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 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, in the longitudinal direction, 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 one light-emitting element to the end of the first electrode of an adjacent light-emitting element.

[0018] Specifically, the LED-PH006 has, for example, a total of 14,824 light-emitting elements 250 in the longitudinal direction, enabling exposure processing corresponding to an image width in the longitudinal direction of approximately 315 mm (≒ approximately 18.5 mm × 17 chips). In the short direction of the light-emitting device 040, the array pitch L1 between adjacent light-emitting elements 250 of the light-emitting device 040 is approximately 350 μm. By reducing the array 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 array pitch L1 is set based on various variations, such as mounting variations in the mounting equipment (die bonder) and variations in the manufacturing process of the light-emitting elements.

[0019] Furthermore, adjacent light-emitting devices 040 in the second direction may be arranged such that their respective light-emitting elements 250 overlap in the first direction. During the mounting process of the light-emitting devices 040, misalignment can occur, causing the position of the light irradiated on the photosensitive drum 001 to shift at the boundary portion of each light-emitting device 040, resulting in variations in density and the formation of image streaks. However, by arranging the light-emitting elements 250 of adjacent light-emitting devices 040 in the second direction to overlap in the first direction, the boundaries of the light-emitting element rows become ambiguous, suppressing the occurrence of variations in density due to misalignment of the irradiated light and image streaks. By calculating the amount of overlap from the maximum amount of mounting variation of the mounting device (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, it is possible to more effectively suppress the occurrence of variations in density due to misalignment of the irradiated light and image streaks.

[0020] Figure 3 is a schematic cross-sectional view showing an example of a light-emitting element and a transistor connected to it. The transistor is an example of an active element. Figure 3 shows a light-emitting element 250 and a transistor 314. The 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 Figure 3. The transistor 314, which is arranged on a silicon substrate 310, consists of a gate 313, a drain 312, and a source 311. Here, an example of a MOSFET transistor having an active layer on a single-crystal silicon substrate is shown.

[0021] The transistor drain 112 and the light-emitting element 250 are electrically connected by a wiring 117 consisting of multiple contact plugs 315_1 to 315_4 and multiple metal layers 316_1 to 316_4, with an insulating layer 319 provided between each wiring. In Figure 3, the insulating layer 319 is shown as a single layer, but it may also be a multi-layered structure.

[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 an insulating layer separating two adjacent first electrodes 316-4. In Figure 3, the organic compound layer is shown as a single layer, but the organic compound layer 321 may consist 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 degradation 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, the organic compound layer 321 is thinned by a structure 327 having a large step directly beneath it, electrically isolating the two light-emitting elements 250. Furthermore, the second electrode 322 is electrically connected and serves as a common electrode among the multiple light-emitting elements 250. In the light-emitting device 040, the combination of the light-emitting elements 250 and the drive circuit having the transistor 314 is repeatedly arranged in the matrix direction.

[0024] Note that the method of electrical connection with the electrodes (source electrode, drain electrode) included in the transistor is not limited to the configuration shown in Figure 3. It is sufficient that either the source electrode or the drain electrode of the transistor is electrically connected, in accordance with the polarity of the first electrode 316_4 and the polarity of the transistor.

[0025] Furthermore, the transistor is not limited to a transistor using a single-crystal silicon wafer; it may also be a thin-film transistor (TFT) having an active layer on an insulating surface of a substrate. Examples of active layers include non-single-crystal silicon such as single-crystal silicon, amorphous silicon, and microcrystalline silicon, and non-single-crystal oxide semiconductors such as indium zinc oxide and indium gallium zinc oxide. By using a transistor using a single-crystal silicon wafer, it is possible to miniaturize the drive circuit and increase the speed of the circuit containing the transistor.

[0026] Figure 4 shows an example of a circuit block diagram of the light-emitting device 100, which is the light-emitting device 040 according to this embodiment. The light-emitting device 100 is an input interface circuit. 118 , register 101, Reference current source 110, programmable current source 111, current source group for pixel bias source 112, Pixel bias source 113, It has a pixel driving circuit 114. The horizontal scanning circuit 115 has a data holding circuit 117 and a shift register 116. Input interface circuit 18 It receives mode information for accessing power supplies and registers, as well as image data information, from an external interface, and outputs data signals to register 101 and horizontal scanning circuit 115.

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

[0028] The pixel driving circuit 114 is connected to the light-emitting element, and the driving current is determined by the bias voltage supplied from the current control circuit 113. In addition, the pixel driving circuit 114 controls the illumination and de-illumination of the light-emitting element based on the signal supplied from the data holding circuit 117. The pixel driving circuit 114 has multiple driving circuits, each of which drives a corresponding light-emitting element from among the multiple 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, all transistors are assumed to be substantially the same size. The bias current source group 112 consists of transistors M0 to Mi. The current control circuit consists of transistors M1a to Mi and buffers B1 to Bi connected between the gate-drain terminals of transistors M1a to Mi.

[0030] The pixel driving circuit 114 has a first group of transistors M11 to Mik and a second group of transistors M111 to Mi1k, with each transistor M111 to Mi1k of the second group connected in series to the 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] Output current I of the programmable current source 111 outThis is connected to the drain terminal of transistor M0 of the bias current source group 112. Transistor M0 is diode-connected, and the voltage Vbn determined by the current Iout is applied in common to the gates of transistors M0 to Mi, so I1 to I in Figure 5 i is I out The same current flows.

[0032] In the first circuit block 220, the drain terminal of transistor M1a and the drain terminal of transistor M1, which constitute the current control circuit 113, are connected in series. 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 plays a role in absorbing 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] Transistor M1a is diode-connected via buffer B1, and its gate potential is determined by the voltage V, which is determined by the current I1. bp1 This 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 drive current I is equal to that of each light-emitting element O11 to O1k. 11 ~I 1k It can supply power. The first transistor functions as a constant current source.

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

[0035] When the pixel driving 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 transistors M0 and M1~Mi close together to form a current mirror circuit, the configuration becomes less susceptible to fluctuations in the power line, thus providing an advantage in reducing unevenness. Similarly, arranging transistor M1a and the first transistors M11~M1k close together to form a current mirror circuit also provides an advantage in reducing unevenness.

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

[0037] In this embodiment, the size of each transistor is substantially the same, but it is also possible to adjust the size of each transistor using the register 101. By adjusting the size of transistors M1 to Mi of the bias current source group 112 using the register setting, the Miller ratio with respect to transistor M0 changes, and thus the current of the drive circuit can be loosely adjusted. Similarly, if the size of transistors M1a to Mia of the current control circuit 113 can be adjusted using the register setting, the current of the drive circuit can be loosely adjusted.

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

[0039] Figure 6 is a diagram that further illustrates the light-emitting device 100 shown in Figure 4. Figure 6 is an example of a planar layout diagram of the circuit block of the light-emitting device 100, and illustrates the placement of the capacitive element 400. In Figure 6, the components necessary to explain the placement of this capacitive element 400 are extracted and explained from the circuit block shown in Figure 4.

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

[0041] A pixel driving circuit 114 is positioned between the first edge 401 and the second edge 402. The pixel driving circuit 114 is a circuit for driving the light-emitting elements 250 arranged in the matrix described in Figures 2 and 3. Since the area around the light-emitting elements 250, which are positioned on top of the pixel driving circuit 114, is sealed with a sealing material, the light-emitting elements 250 need to be positioned further inside the light-emitting device 100. Consequently, the pixel driving circuit 114 is also positioned further inside the light-emitting device 100.

[0042] A pad 403 is positioned along a first direction between the first edge 401 and the pixel driving circuit 114 as an input interface 108. At least one pad 403 is provided. The pad 403 is connected to a terminal provided outside the light-emitting device 250. Typically, bonding pads and bonding wires made of gold or the like are connected to the pad 403. However, this is not the only example, and solder balls may also be connected to the pad 403. Multiple pads 403 are connected to the light-emitting device 250. 100 This includes pads used for sending and receiving signals to and from the outside, and pads to which power voltage is supplied from an external source. Signals input to pad 403 from an external source include signals to control the amount of current in the current adjustment circuit 404 and signals to control the operating timing of the pixel driving circuit 114.

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

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

[0045] The current adjustment circuit 404 includes multiple current control circuits 113 as described in Figures 1 and 2, and may also include either a programmable current source 111, a bias current source 112, or both. The current adjustment circuit 404 supplies a bias voltage to the pixel driving circuit 114.

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

[0047] At least one capacitive element 400 and at least one current adjustment circuit 404 are provided. The capacitive element 400 is connected between the first power supply voltage and the second power supply voltage of the current adjustment circuit 404, as in Embodiment 1, with the first power supply voltage being PVDD and the second power supply voltage being VSS.

[0048] Here, the first power supply voltage is denoted as PVDD in Figure 2, and the second power supply voltage as VSS in Figure 2. PVDD can be a voltage of approximately 3V, and VSS can be a voltage of approximately 0V. 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 transistor M1a in the current control circuit 113 shown in Figure 2 fluctuates. Pixel driving circuit 114 The bias supplied to it also fluctuates accordingly. As a result, the current flowing through the light-emitting element 250 also fluctuates, causing the amount of light emitted by the light-emitting element 250 to fluctuate, resulting in unevenness in the light-emitting region (degradation of 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 allows a stable power supply voltage (bias voltage) to be supplied to the pixel driving circuit 114, thereby suppressing the image quality degradation described above.

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

[0052] Therefore, placing the capacitive 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 for a smaller capacitive element 400, and as a result, the size of the light-emitting device 100 can be reduced.

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

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

[0055] The capacitive element 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 capacitive element 400 can be an MIS (Metal-Insulator-Semiconductor) type capacitor. In this structure, one of the first and second electrodes is placed inside the silicon substrate 310 shown in Figure 3. The other electrode of the first and second electrodes is then used as a gate electrode with a metal electrode. 313The device is configured as shown. This metal electrode is formed from, 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, it can be formed as an MIS type capacitor.

[0057] Furthermore, the capacitive element 400 can be a MIM (Metal-Insulator-Metal) type capacitor. In an MIM type capacitor, the first metal electrode, which serves as the first electrode, and the second metal electrode, which serves as the second electrode, can be formed on 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, which are formed on the same wiring layer. This allows the capacitive element 400 to be formed. Another example of an MIM type capacitor is that the first metal electrode and the second metal electrode can be formed on different wiring layers. In this case, an insulating member is provided between the first metal electrode and the second metal electrode, which are formed on different wiring layers. This allows the capacitive element 400 to be formed.

[0058] This embodiment is not limited to the arrangement of the capacitive element 400 and current adjustment circuit 404 shown in Figure 6. In other words, it is not limited to a configuration in which multiple capacitive elements 400 and multiple current adjustment circuits are arranged alternately. For example, the capacitive element 400 may be arranged extending from the region of the third side 410 to the region of the side opposite the third side 410. In other words, the multiple capacitive elements 400 shown in Figure 6 may be formed as a single capacitive element region. The current adjustment circuit 404 may also be provided between this capacitive element 400 and the pixel driving circuit 114. In other words, the current adjustment circuit 404 may be provided between the capacitive element 400 and the pixel driving circuit 114. In such a configuration, it is possible to form the capacitive element 400 over an even wider area. This makes it possible to supply a stable power supply voltage.

[0059] [Example 2] Figure 7 shows an example of a plan view of the circuit blocks constituting the light-emitting device 100 in Figure 1 in this embodiment. The differences from Embodiment 1 will be explained using Figure 7. Components in Figure 7 that have the same reference numerals as those in Figure 6 are the same as those explained in Embodiment 1, so their explanation will be omitted.

[0060] Between the second edge 402 and the pixel driving circuit 114, capacitive 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. Current adjustment circuits 404_1 to 404_3 are multiple current adjustment circuits, each being a current adjustment circuit.

[0061] A current adjustment circuit 404-1, which is the first of several current adjustment circuits, is positioned between the first capacitive element 400_5, one of several capacitive elements 400_5 to 400_8, and the second capacitive element 400_6, one of several capacitive elements. Furthermore, a current adjustment circuit 404-3, which is the second of several current adjustment circuits, is positioned between the third capacitive element 400_7, one of several capacitive elements, and the fourth capacitive element 400_8, one of several capacitive elements.

[0062] At least one capacitive element 400 and at least one current adjustment circuit 404 are provided. The capacitive element 400 is connected between the first power supply voltage and the second power supply voltage of the current adjustment circuit 404, as in Embodiment 1, with the first power supply voltage being PVDD and the second power supply voltage being VSS.

[0063] This provides the effect of suppressing image quality degradation as described in Example 1.

[0064] In this embodiment, the capacitive element 400 is placed on the side of the current adjustment circuit 404. This effectively suppresses 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 well, as described above, similar to Embodiment 1, it is possible to suppress the degradation of the characteristics of the light-emitting device 100 without increasing the size of the light-emitting device 100, thereby achieving a balance between cost and performance.

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

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

[0068] [Example 3] Figure 8 shows an example of a plan view of the circuit blocks constituting the light-emitting device 100 in Figure 1 in this embodiment. The differences from Embodiment 2 will be explained using Figure 8. Components in Figure 8 that have the same reference numerals as those in Figure 6 are the same as those explained in Embodiment 1, so their explanation will be omitted.

[0069] In this embodiment, a capacitive element 400 is placed between the second side 402 and the pixel driving circuit 114, and another capacitive element 400 is placed between the first side 401 and the pixel driving circuit 114. Capacitive elements 400_1 to 400_4 placed on the first side 401 are located in dead space where no circuit elements are placed.

[0070] This will be explained in detail. The metal wiring 700 is wiring that functions as a moisture-resistant ring. In this embodiment, in a plan view with respect to the light-emitting region (plan view with respect to the light-emitting device), the metal wiring 700 is arranged to surround the entire circumference of the light-emitting device 100. This configuration is not limited to this, and a part of the metal wiring 700 may be cut. In a plan view with respect to the light-emitting region (light-emitting device), the metal wiring 700 comprises a first portion arranged along the first edge 401, a second portion 700-1 arranged along the second edge 402, and a third portion 700-2 arranged along the third edge 410. The first portion has a first region 700-3 arranged in a second direction with a distance from the first edge 401 as a first distance D1, and a second region 700-4 arranged in a second direction with a distance from the first edge 401 as a second distance D2 which is longer than the first distance D1. A fifth capacitance element, capacitance element 400_1, is located in the region between the first region 700-3 and the light-emitting region, and between the second region 700-4 and the third edge 410. Furthermore, at least one of capacitance elements 400_3 and 400_4, located between the edge opposite the third edge 410 (the fourth edge) and the second region 700-4, is a sixth capacitance element.

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

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

[0073] By adopting the configuration described in this embodiment, the capacitive element 400 connected between the first power supply voltage and the second power supply voltage can be made larger than in Embodiment 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 make effective use of dead space, it is possible to suppress the increase in chip size while suppressing the deterioration of the characteristics of the light-emitting device 100.

[0075] Furthermore, although Figure 8 shows only one second region 700-4, which forms a recess in the moisture-resistant ring along the first side 401, more recesses may be provided.

[0076] In the configuration shown in Figure 8, the capacitive element 400 is connected between the first power supply voltage and the second power supply voltage supplied to the current adjustment circuit 404, which further stabilizes the power supply provided to the current adjustment circuit 404.

[0077] [Example 4] A fourth embodiment of the light-emitting device according to the present invention will be described in detail. Only parts that differ from the above overview and previously described embodiments will be described, and the same or similar parts will be denoted by the same reference numerals and their descriptions will be omitted.

[0078] Figure 9 is a figure 4 This is an example of a planar layout diagram of the circuit block of the light-emitting device 100 on the device.

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

[0080] Register 109 is located between the recesses 700 on the first side 401.

[0081] A protection element 800 is placed near pad 403 to protect the internal circuit, and external signals input to pad 403 pass through the protection element 800 before being supplied to the internal circuit.

[0082] A pixel bias source 113 is positioned in the first direction between the second side 402 and the pixel driving 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 the pixel bias source 113.

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

[0085] The reference current source 110, the programmable current source 111, and the pixel bias current source 112 are supplied with a first power supply voltage and a second power supply voltage, and the capacitive elements 400_1 and 400_2 are electrically connected between the first power supply voltage and the second power supply voltage. This suppresses fluctuations in the power supply supplied to the reference current source 110, the programmable current source 111, and the pixel bias current source 112, thereby suppressing degradation of image quality.

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

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

[0088] In this embodiment, the first, second, and third power supply voltages are PVDD, VSS, and VCAT as shown in Figure 2, but the power supply is not limited to these.

[0089] As an optical writing device used in an image forming apparatus, the light output of a single OLED light-emitting element is not sufficiently high. 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, a potential difference larger than the first power supply voltage PVDD and the second power supply voltage VSS may be required between the light-emitting element and the drive circuit connected to it. In this embodiment, the light-emitting element and the drive circuit connected to it are connected to the first power supply voltage PVDD and the third power supply VCAT, and normally |PVDD-VSS|<|PVDD-VCAT|, so the withstand voltage of the transistor constituting the pixel drive circuit 114 is higher than that of the capacitive element 400.

[0090] In this embodiment, since a capacitive element 400 cannot be placed between the first power supply voltage and the third power supply due to voltage withstand capability, a capacitive element is 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 is less than the voltage rating of the capacitive element 400, the capacitive element 400 may be connected between the first power supply voltage and the third power supply.

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

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

[0094] When forming the light-emitting element 250 by vapor deposition, the vapor deposition aperture mask is brought into contact with the substrate at least partially. Due to vapor deposition blurring that occurs during the vapor deposition process, a certain minimum distance is required between the light-emitting element 250 and the second side 402. In this embodiment, the light-emitting element 250 is formed superimposed on the pixel driving circuit 114 in a plan view.

[0095] As a result, a dead space is created between the second side 402 and the pixel driving circuit 114, with an area of ​​approximately 0.01 mm². 2 From 2.4mm 2 It is in that space. A capacitive element 400 is placed there.

[0096] This embodiment utilizes dead space to suppress an increase in the size of the light-emitting device 100 while suppressing image quality degradation due to power fluctuations. When the total electrode area of ​​the light-emitting elements 250 (≒pixel driving circuit 114) arranged in the matrix direction is S, the total arrangement area of ​​the capacitive elements 400 placed between the second side 402 and the pixel driving circuit 114 is A, and the area of ​​the light-emitting device 100 is 1, 0.006 <A<S<1.0 This will be the ratio.

[0097] By adopting the configuration described in this embodiment, it becomes possible to suppress the size of the light-emitting device while ensuring a stable power supply voltage and reliable characteristics, thereby achieving the effect of low-cost manufacturing.

[0098] [Example 5] Figure 10 is a schematic diagram showing an example of a display device according to this embodiment. The display device 1000 may have 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. Flexible printed circuits FPCs 1002 and 1004 are connected to the touch panel 1003 and the display panel 1005. Transistors are printed on the circuit board 1007. The battery 1008 does not need to be provided if the display device is not a portable device, or it may be provided in a different location even if it is a portable device.

[0099] The display device according to this embodiment may have a color filter having red, green, and blue colors. The color filter may have the red, green, and blue colors arranged in a delta array.

[0100] The display device according to this embodiment may be used in the display unit of a mobile terminal. In that case, it may have both display and operation functions. Examples of mobile terminals include smartphones and other mobile phones, tablets, and head-mounted displays.

[0101] The display device according to this embodiment may be used in the display unit of an imaging device having an optical unit with multiple lenses and an image sensor that receives light that has passed through the optical unit. The imaging device may have a display unit that displays information acquired by the image sensor. Furthermore, the display unit may be a display unit exposed to the outside of the imaging device or a display unit located inside the viewfinder. The imaging device may be a digital camera or a digital video camera.

[0102] Figure 11(a) is a schematic diagram showing an example of an imaging device according to this embodiment. The imaging device 1100 may include 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 that case, the display device may display not only the image to be captured, but also environmental information, imaging instructions, etc. Environmental information may include the intensity of ambient light, the direction of ambient light, the speed at which the subject is moving, the possibility of the subject being obscured by an obstacle, etc.

[0103] Since the optimal timing for imaging is very short, it is best to display the information as quickly as possible. Therefore, it is preferable to use a display device using the organic light-emitting element of the present invention, because organic light-emitting elements have a fast response speed. Display devices using organic light-emitting elements can be used more suitably than liquid crystal display devices, which require a fast display speed.

[0104] The imaging device 1100 has an optical section (not shown). The optical section has multiple lenses that form an image on the image sensor housed in the housing 1104. The focus can be adjusted by adjusting the relative positions of the multiple lenses. This operation can also be performed automatically. The imaging device may also be called a photoelectric converter. The photoelectric converter may not capture images sequentially, but may include imaging methods such as detecting the difference from the previous image or extracting from an image that is always being recorded.

[0105] Figure 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 response unit. The operation unit may also be a biometric recognition unit that recognizes fingerprints to unlock or otherwise perform actions. 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. Images captured by the camera function are displayed on the display unit. Examples of electronic devices include smartphones and laptop computers.

[0106] Figure 12 is a schematic diagram showing an example of a display device according to this embodiment. Figure 12(a) is 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 for the display unit 1302.

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

[0108] Furthermore, the frame 1301 and the display section 1302 may be curved. Their radius of curvature may be between 5000 mm and 6000 mm.

[0109] Figure 12(b) is a schematic diagram showing another example of the display device according to this embodiment. The display device 1310 in Figure 12(b) is configured to be foldable 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 have light-emitting devices according to this embodiment. The first display unit 1311 and the second display unit 1312 may be a single display device without seams. The first display unit 1311 and the second display unit 1312 can be separated at a 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 together display a single image.

[0110] Figure 13(a) is a schematic diagram showing an example of a lighting device according to this embodiment. The lighting device 1400 comprises a housing 1401, a light source 1402, a circuit board 1403, and an optical filter. Ta The light source may include 1404 and a light diffusion section 1405. The light source may have 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 section can effectively diffuse the light from the light source, such as for lighting up, and deliver light over a wide area. The optical filter and light diffusion section may be provided on the light-emitting side of the illumination. A cover may be provided on the outermost part as needed.

[0111] The lighting device is, for example, a device for illuminating a room. The lighting device may emit white light, cool white light, or any other color from blue to red. It may have a dimming circuit to adjust the brightness of these lights. 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 that converts AC voltage to DC voltage. White light has a color temperature of 4200K, and cool white light has a color temperature of 5000K. The lighting device may have a color filter.

[0112] Furthermore, the lighting device according to this embodiment may have a heat dissipation section. The heat dissipation section releases heat from inside the device to the outside, and examples include metals with high specific heat, liquid silicon, etc.

[0113] Figure 13(b) is a schematic diagram of an automobile, which is an example of a mobile body according to this embodiment. The automobile has a taillight, which is an example of a lighting device. The automobile 1500 has a taillight 1501, and may be configured to illuminate when the brakes are applied or the like.

[0114] The tail lamp 1501 may have an organic light-emitting element according to this embodiment. The tail lamp may have a protective member to protect the organic EL element. The protective member has a reasonably high strength and can be made of any transparent material, but it is preferably made of polycarbonate or the like. A frangic acid derivative, an acrylonitrile derivative, or the like may be mixed with the polycarbonate.

[0115] The automobile 1500 may have a body 1503 and windows 1502 attached thereto. The windows may be transparent displays, unless they are windows for checking the front and rear of the automobile. The transparent displays may have organic light-emitting elements according to this embodiment. In this case, the constituent materials such as electrodes of the organic light-emitting element are made of transparent members.

[0116] The mobile body according to this embodiment may be a ship, aircraft, drone, etc. The mobile 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 an organic light-emitting element according to this embodiment.

[0117] Referencing Figure 14, examples of applications of the display devices of each embodiment described above will be explained. The display device can be applied to systems that can be worn as wearable devices such as smart glasses, HMDs, and smart contact lenses. The imaging display device used in such applications comprises an imaging device capable of photoelectric conversion of visible light and a display device capable of emitting visible light.

[0118] Figure 14(a) illustrates a pair of 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 surface of the lens 1601 of the glasses 1600. In addition, the display devices of each embodiment described above are provided on the back surface of the lens 1601.

[0119] The eyeglasses 1600 further include a control device 1603. The control device 1603 functions as a power supply that provides power to the imaging device 1602 and the display device according to each embodiment. The control device 1603 also controls the operation of the imaging device 1602 and the display device. The lens 1601 has an optical system formed therein for focusing light onto the imaging device 1602.

[0120] Figure 14(b) illustrates a pair of glasses 1610 (smart glasses) according to one application example. The glasses 1610 have a control device 1612. The control device 1612 is equipped with an imaging device equivalent to an imaging device 1602 and a display device. An optical system is formed in the lens 1611 for projecting light emitted from 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 supply to provide power to the imaging device and the display device, and also controls the operation of the imaging device and the display device. The control device may have a gaze detection unit that detects the wearer's gaze. Gaze detection may use infrared light. The infrared light emitter emits infrared light towards the eyeball of the user who is fixating on the displayed image. An image of the eyeball is obtained by detecting the reflected light from the eyeball of the emitted infrared light with an imaging unit having a photodetector. By having a reduction means that reduces the light from the infrared light emitter to the display unit in planar view, the deterioration of image quality is reduced.

[0121] The user's gaze towards the displayed image is detected from an image of the eyeball obtained by imaging with infrared light. Any known method can be applied to gaze detection using an image of the eyeball. For example, a gaze detection method based on the Purkinje image obtained by the reflection of the irradiated light from the cornea can be used.

[0122] More specifically, gaze detection processing is performed based on the pupil-corneal reflection method. Using the pupil-corneal reflection method, a gaze vector representing the orientation (rotation angle) of the eyeball is calculated based on the pupil image and Purkinje image contained in the captured image of the eyeball, thereby detecting the user's gaze.

[0123] A display device according to one embodiment of the present invention includes an imaging device having a light-receiving element, and may control the display image of the display device based on the user's gaze information from the imaging device.

[0124] Specifically, the display device determines a first display area that the user is fixated on, and a second display area other than the first display area, based on gaze information. The first and second display areas may be determined by the control device of the display device, or they may be determined by an external control device and received. Within the display areas 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] Furthermore, the display area has a first display area and a second display area different from the first display area, and based on gaze information, the area with higher priority is determined from the first display area and the second display area. The first and second view areas may be determined by the control device of the display device, or they 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 the areas other than the high-priority area. In other words, the resolution of areas with relatively lower priority may be lowered.

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

[0127] When display control is based on visual detection, this method is preferably applicable to smart glasses that further include an imaging device for capturing images of the surrounding environment. The smart glasses can display the 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) shows an image forming apparatus according to one embodiment of the present invention. 40 This is a schematic diagram. The image forming apparatus includes a photoreceptor, an exposure light source, a developing unit, a charging unit, a transfer unit, a transport roller, and a fuser.

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

[0130] Figures 15(b) and 15(c) are schematic diagrams showing how multiple light-emitting units 38 are arranged on a long substrate in an exposure light source 28. 37 represents the direction parallel to the axis of the photoreceptor and indicates the row direction in which the organic light-emitting elements are arranged. This row direction is the same as the direction of the axis of rotation of the photoreceptor 27. This direction can also be called the long axis direction of the photoreceptor.

[0131] Figure 15(b) shows a configuration in which the light-emitting units are arranged along the long axis of the photoreceptor. 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 positioned at different locations in the row direction.

[0132] The first column has multiple 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. In other words, multiple light-emitting units are also arranged at intervals in the row direction.

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

[0134] As described above, by using the device employing the organic light-emitting element according to this embodiment, stable display with good image quality is possible even during long-term display.

[0135] This disclosure includes the following:

[0136] (Composition 1) A light-emitting device comprising a first side extending in a first direction, a second side extending in the first direction opposite to the first side, and a third side extending in a second direction perpendicular to the first direction, wherein a first power supply voltage and a second power supply voltage having a different value from the first power supply voltage are supplied, A light-emitting region having a plurality of light-emitting elements arranged in a plurality of rows along the first direction, and a plurality of drive circuits that drive corresponding light-emitting elements among the plurality of light-emitting elements, Between the first side and the light-emitting region, there are a plurality of pads arranged along the first direction and connected to terminals outside the light-emitting device, The system comprises a node to which the first power supply voltage is supplied and a capacitive element connected to the node to which the second power supply voltage is supplied, A light-emitting device characterized in that the capacitive element is arranged between the second side and the light-emitting region.

[0137] (Configuration 2) The circuit comprises a current adjustment circuit that adjusts the amount of current output by the plurality of drive circuits, and a plurality of capacitive elements, each of which is a capacitive element. The light-emitting device according to configuration 1, characterized in that the current adjustment circuit is arranged between one of the plurality of capacitive elements and another of the plurality of capacitive elements.

[0138] (Composition 3) The light-emitting device according to configuration 2, characterized in that the plurality of capacitive elements and the current adjustment circuit are arranged along the first direction.

[0139] (Composition 4) It has a plurality of current adjustment circuits, each of which is the current adjustment circuit, A first current adjustment circuit is arranged between a first capacitive element among the plurality of capacitive elements and a second capacitive element among the plurality of capacitive elements, The light-emitting device according to configuration 2, characterized in that a second current adjustment circuit among the plurality of current adjustment circuits is arranged between a third capacitive element among the plurality of capacitive elements and a fourth capacitive element among the plurality of capacitive elements.

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

[0141] (Composition 6) The light-emitting device according to any one of configurations 1 to 4, wherein, separately from 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 are arranged between the first side and the light-emitting region.

[0142] (Composition 7) The light-emitting device according to configuration 5, wherein, separately from 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] (Composition 8) The light-emitting device according to configuration 7, characterized in that the fifth capacitive element and one of the plurality of pads are arranged along the first direction.

[0144] (Composition 9) In a plan view of the light-emitting region, the metal wiring comprises a first portion arranged along the first edge, a second portion arranged along the second edge, and a third portion arranged along the third edge. In the plan view, the first portion has a first region in the second direction where the distance from the first side is set to a first distance, and a second region in the second direction where the distance from the first side is set to a second distance which is longer than the first distance. The light-emitting device according to configuration 8, characterized in that the fifth capacitive element is arranged in a region between the first region and the light-emitting region, and between the second region and the third edge.

[0145] (Composition 10) The light-emitting device according to configuration 9, wherein, separately from the capacitive element and the fifth capacitive element, a sixth capacitive element connected to the node to which the first power supply voltage is supplied and the node to which the second power supply voltage is supplied is arranged between the fourth side facing the third side and the second region.

[0146] (Composition 11) It has a protective element connected to one of the plurality of pads, The light-emitting device according to any one of configurations 1 to 10, characterized in that the protective element is arranged in the region between the first edge and the light-emitting region.

[0147] (Composition 12) The light-emitting device according to configuration 11, characterized in that the protective element and the one pad are arranged along the first direction.

[0148] (Composition 13) The first power supply voltage is supplied to one of the plurality of pads. The light-emitting device according to any one of configurations 1 to 12, characterized in that the second power supply voltage is supplied to another one of the plurality of pads.

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

[0150] (Composition 15) The light-emitting device according to any one of configurations 1 to 14, characterized in that the capacitive element is an MIS (Metal-Insulator-Semiconductor) type capacitor.

[0151] (Composition 16) The light-emitting device according to any one of configurations 1 to 14, characterized in that the capacitive element is of the MIM (Metal-Insulator-Metal) type.

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

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

[0154] (Composition 19) A light-emitting module comprising multiple light-emitting devices, each of which is a light-emitting device described in one of items 1 to 18.

[0155] (Composition 20) The light-emitting module according to configuration 19, which has a lens array for concentrating the light output by the plurality of light-emitting devices.

[0156] (Composition 21) An electronic device comprising: a display unit having a light-emitting device described in any one of configurations 1 to 18; a housing on 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 Interfaces 109 registers 110 Reference current source 111 Programmable Current Source 112 Pixel bias source current source 113 Pixel bias source 114 Pixel Driving Circuit 115 Horizontal scanning circuit 220 Block 1 221 Block 2 22i The i-th block 230 First transistor 231 Second transistor 232 Drive Circuit 250 light-emitting elements 110 Semiconductor substrates 111 Transistor 114 source 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 An insulating layer between the wires. 321 Organic compound layer having an emissive layer 322 2nd electrode 325 Protective layer 400 Capacitive element 401 First side 402 Second side 403 terminal 404 Current adjustment circuit 700 Recess of the first side 800 protective elements

Claims

1. A light-emitting device comprising a first side extending in a first direction, a second side extending in the first direction opposite to the first side, and a third side extending in a second direction perpendicular to the first direction, wherein a first power supply voltage and a second power supply voltage having a different value from the first power supply voltage are supplied, A light-emitting region having a plurality of light-emitting elements arranged in a plurality of rows along the first direction, and a plurality of drive circuits that drive corresponding light-emitting elements among the plurality of light-emitting elements, Between the first side and the light-emitting region, there are a plurality of pads arranged along the first direction and connected to terminals outside the light-emitting device, A current adjustment circuit that adjusts the amount of current output by the plurality of drive circuits, The current adjustment circuit comprises a first node to which the first power supply voltage supplied to the current adjustment circuit is supplied, a second node to which the second power supply voltage supplied to the current adjustment circuit is supplied, and capacitive elements connected to the first node and the second node. A light-emitting device characterized in that the current adjustment circuit and the capacitive element are arranged between the second side and the light-emitting region.

2. The light-emitting device according to Claim 1, wherein the device has a plurality of capacitive elements including the capacitive element, and the current adjustment circuit is arranged 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, characterized in that the plurality of capacitive elements and the current adjustment circuit are arranged along the first direction.

4. The light-emitting device according to claim 2, further comprising a plurality of current adjustment circuits including the current adjustment circuit, wherein the first current adjustment circuit is disposed between a first capacitive element among the plurality of capacitive elements and a second capacitive element among the plurality of capacitive elements, and the second current adjustment circuit is disposed between a third capacitive element among the plurality of capacitive elements and a fourth capacitive element among the plurality of capacitive elements.

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

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

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

9. The light-emitting device according to claim 8, wherein, in a plan view of the light-emitting region, the metal wiring comprises a first portion arranged along the first edge, a second portion arranged along the second edge, and a third portion arranged along the third edge, wherein, in a plan view, the first portion comprises a first region arranged in the second direction at a first distance from the first edge, and a second region arranged in the second direction at a second distance from the first edge that is longer than the first distance, and the fifth capacitive element is arranged in a region between the first region and the light-emitting region, between the second region and the third edge.

10. The light-emitting device according to claim 9, wherein, separately from the capacitive element and the fifth capacitive element, a sixth capacitive element connected to the node to which the first power supply voltage is supplied and the node to which the second power supply voltage is supplied is arranged between the fourth side facing the third side and the second region.

11. The light-emitting device according to claim 1, further comprising a protective element connected to one of the plurality of pads, wherein the protective element is located in the region between the first edge and the light-emitting region.

12. The light-emitting device according to claim 11, characterized in that the protective element and the one pad are arranged along the first direction.

13. The light-emitting device according to claim 1, characterized in that the first power supply voltage is supplied to one of the plurality of pads and the second power supply voltage is supplied to another of the plurality of pads.

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

15. The light-emitting device according to claim 1, characterized in that the capacitive element is an MIS type capacitor.

16. The light-emitting device according to claim 1, characterized in that the capacitive element is of the MIM type.

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

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

19. A light-emitting device comprising a first side extending in a first direction, a second side extending in the first direction opposite to the first side, and a third side extending in a second direction which is perpendicular to the first direction, wherein a first power supply voltage and a second power supply voltage having a different value from the first power supply voltage are supplied, A light-emitting region having a plurality of light-emitting elements arranged in a plurality of rows along the first direction, and a plurality of drive circuits that drive corresponding light-emitting elements among the plurality of light-emitting elements, Between the first side and the light-emitting region, there are a plurality of pads arranged along the first direction and connected to terminals outside the light-emitting device, A capacitive element connected to the node to which the first power supply voltage is supplied and the node to which the second power supply voltage is supplied, The system includes a protective element connected to one of the plurality of pads, The capacitive element is arranged between the second side and the light-emitting region. A light-emitting device characterized in that the protective element is arranged in the region between the first edge and the light-emitting region.

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

21. The light-emitting module according to claim 20, further comprising a lens array for concentrating the light emitted by the plurality of light-emitting devices.

22. An electronic device comprising: a display unit having a light-emitting device according to any one of claims 1 to 19; a housing on which the light-emitting device is provided; and a communication unit provided in the housing for communicating with the outside.

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