Light-emitting devices, display devices, photoelectric converters, and electronic devices

Abstract

To provide a technique advantageous to detection of temperatures.SOLUTION: A light emitting device, in which a first substrate including a light emitting area having a plurality of light emitting elements disposed, and a second substrate having a temperature detection unit for detecting a temperature of the first substrate disposed are laminated, has the temperature detection unit disposed in an overlap area overlapping on the light emitting area of the second substrate in an orthographic projection with respect to a principal surface having the light emitting area of the first substrate disposed.SELECTED DRAWING: Figure 1

Description

Technical Field

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[0001] The present invention relates to a light-emitting device, a display device, a photoelectric conversion device, and an electronic device.

Background Art

[0002] Since self-emitting elements such as organic electroluminescence (EL) elements have temperature-dependent light-emitting characteristics, Patent Document 1 shows that a sensor element for measuring temperature is arranged in a display area where an EL element is arranged.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When arranging a sensor element in the display area, it is necessary to arrange not only the sensor element itself but also a wiring pattern for operating the sensor element in the display area, which makes it difficult to increase the resolution and miniaturize the display area. <000002​​​​​​​​​​​​​​​​[Effects of the Invention]

[0007] According to the present invention, a technology advantageous for temperature detection can be provided. [Brief explanation of the drawing]

[0008] [Figure 1] A diagram showing an example configuration of the light-emitting device according to this embodiment. [Figure 2] This figure shows a modified example of the light-emitting device in Figure 1. [Figure 3] This figure shows a modified example of the light-emitting device in Figure 1. [Figure 4] This figure shows a modified example of the light-emitting device in Figure 1. [Figure 5] Figure 4 shows an example of the configuration of the control circuit of the light-emitting device. [Figure 6] Figure 4 is a diagram illustrating the operation of the light-emitting device. [Figure 7] A diagram showing an example of a display device using the light-emitting device of this embodiment. [Figure 8] A diagram showing an example of a photoelectric conversion device using the light-emitting device of this embodiment. [Figure 9] A diagram showing an example of an electronic device using the light-emitting device of this embodiment. [Figure 10] A diagram showing an example of a display device using the light-emitting device of this embodiment. [Figure 11] A diagram showing an example of a lighting device using the light-emitting device of this embodiment. [Figure 12] A diagram showing an example of a mobile body using the light-emitting device of this embodiment. [Figure 13] A diagram showing an example of a wearable device using the light-emitting device of this embodiment. [Modes for carrying out the invention]

[0009] The embodiments will be described in detail below with reference to the attached drawings. Note that the following embodiments do not limit the invention as defined in the claims. While the embodiments describe multiple features, not all of these features are essential to the invention, and the features may be combined in any way. Furthermore, in the attached drawings, identical or similar configurations are given the same reference numerals, and redundant descriptions are omitted.

[0010] An embodiment of the light-emitting device according to the present disclosure will be described with reference to Figures 1 to 6(a) and 6(b). Figure 1 is a diagram showing an example of the configuration of the light-emitting device 10 in this embodiment. The light-emitting device 10 is constructed by stacking a substrate 100 having a light-emitting region 120 on which a plurality of light-emitting elements 121 are arranged, and a substrate 200 on which a temperature sensing unit 231 for detecting the temperature of the substrate 100 is arranged. The user can use the light-emitting device 10 with the main surface of the substrate 100 having the light-emitting region 120 facing the user. An external system 20 may exist outside the light-emitting device 10, and the light-emitting device 10 is connected to the external system 20.

[0011] Multiple light-emitting elements 121 are arranged on the substrate 100 in rows and columns. The area where the multiple light-emitting elements 121 are arranged in a two-dimensional array can be called the light-emitting region 120. The substrate 100 also includes an operation circuit 110 for causing the multiple light-emitting elements 121 arranged in the light-emitting region 120 to emit light at a predetermined brightness. The operation circuit 110 includes a vertical scanning circuit 111 and a signal output circuit 112. The operation of the vertical scanning circuit 111 and the signal output circuit 112 will be described later.

[0012] As described above, the temperature detection unit 231 is provided on the substrate 200. The temperature detection unit 231 is provided in an overlapping region 230 of the substrate 200 that overlaps with the light-emitting region 120 in the orthographic projection of the substrate 100 onto the main surface on which the light-emitting region 120 is provided. In the configuration shown in FIG. 1, the temperature detection unit 231 is provided at the center of the overlapping region 230. Here, the center of the overlapping region 230 can be a region within 20% of the lengths in the row direction and the column direction respectively, in the row direction and the column direction, centered on the geometric centroid position of the overlapping region 230 in the orthographic projection of the substrate 200 onto the main surface on which the temperature detection unit 231 is provided. Also, for example, the center of the overlapping region 230 can be a region within 10% of the lengths in the row direction and the column direction respectively, in the row direction and the column direction, centered on the geometric centroid position of the overlapping region 230 in the orthographic projection of the substrate 200 onto the main surface on which the temperature detection unit 231 is provided. In the configuration shown in FIG. 1, one temperature detection unit 231 is provided at the center of the overlapping region 230 in order to increase the number of light-emitting elements 121 that can be approximated by one temperature detection unit 231 and measure temperature changes over as wide an area as possible.

[0013] The substrate 200 may include a drive circuit 210 and a control circuit 220 in addition to the temperature detection unit 231. However, it is not limited to this, and at least a part of the functions of the drive circuit 210 and the control circuit 220 may be mounted on the substrate 100. Also, for example, at least a part of the functions of the vertical scanning circuit 111 and the signal output circuit 112 provided on the substrate 100 may be mounted on the substrate 200. Hereinafter, the description will be made from the substrate 200 along the data processing flow of the light-emitting device 10.

[0014] The temperature detection unit 231 includes a temperature sensor (not shown) using a diode or the like. The temperature detection unit 231 outputs temperature data 232 obtained by quantifying the temperature change from the reference temperature to the control circuit 220 by A / D converting the output of the temperature sensor.

[0015] The control circuit 220 generates a correction signal 221 according to the temperature data 232 detected by the temperature detection unit 231. For example, the control circuit 220 may hold gamma correction coefficients for linearly correcting the input-output characteristics of the light-emitting device 10 in a built-in LUT (LookUpTable). The control circuit 220 has a function of outputting, as a correction signal, the temperature-corrected coefficient obtained by correcting the gamma correction coefficient read from the LUT according to the temperature data 232. For example, the temperature-corrected coefficient is obtained by solving a quadratic equation approximating the temperature characteristics of the light-emitting element 121 with respect to the temperature data 232. The temperature-corrected coefficient thus obtained is output to the drive circuit 210 as the correction signal 221. In this embodiment, the processing for the gamma correction coefficient is shown, but the types of correction coefficients to which the processing of this block can be applied are not limited to this.

[0016] The drive circuit 210 generates a drive signal for driving a plurality of light-emitting elements 121 from the video signal 21 input from the external system 20 to the light-emitting device 10. At this time, the drive signal is corrected according to the correction signal 221 input from the control circuit 220. For example, the drive circuit 210 performs gamma correction on the video signal 21 sequentially sent from the external system 20 using the correction signal 221, and outputs the obtained video signal to the vertical scanning circuit 111 as the drive signal 211. In this embodiment, it is described that one video signal 21 and one drive signal 211 include the luminance values of a total of four light-emitting elements 121, two light-emitting elements 121 in the row direction and two light-emitting elements 121 in the column direction. In conjunction with the processing of the operation circuit 110 described later, these four light-emitting elements 121 are driven simultaneously.

[0017] A plurality of vertical scanning lines 113 extending in the row direction are connected to the vertical scanning circuit 111. The vertical scanning circuit 111 outputs a write control signal to the vertical scanning lines 113 according to the control of the vertical scanning control signal input from the external system 20. In this embodiment, the write control signal is output to two vertical scanning lines 113 simultaneously.

[0018] Multiple signal output lines 114 extending in the column direction are connected to the signal output circuit 112. The signal output circuit 112 sequentially buffers the drive signals 211 sent from the drive circuit 210 for each column, in accordance with the control of the signal output control signal input from the external system 20. Next, by D / A conversion of the drive signals 211 for each column, it generates a voltage Vsig, which is a brightness signal corresponding to the value of the drive signal 211, and outputs it to the signal output lines 114 extending in the column direction. In this embodiment, the voltage Vsig is output simultaneously to two signal output lines 114.

[0019] A light-emitting element 121 is placed at the intersection of the vertical scan line 113 and the signal output line 114, and the vertical scan line 113 and the signal output line 114 are connected to the light-emitting element 121, respectively. The light-emitting element 121 emits light at a predetermined brightness when a voltage Vsig is supplied to it. In the configuration shown in Figure 1, a light-emitting region 120 having 8 columns in the row direction and 6 rows in the column direction of the light-emitting elements 121 is exemplified, but the number of light-emitting elements 121 is not limited to this. For example, more light-emitting elements 121 can be arranged in the light-emitting region 120. Also, in this specification, as described above, the direction in which the vertical scan line 113 extends (horizontal direction in Figure 1) is referred to as the row direction, and the direction in which the signal output line 114 extends (vertical direction in Figure 1) is referred to as the column direction, but this is not limited to this. The direction in which the vertical scan line 113 extends may be referred to as the column direction, and the direction in which the signal output line 114 extends may be referred to as the row direction.

[0020] In this embodiment, the temperature detection unit 231 is located on the substrate 200, which is laminated with the substrate 100, rather than on the substrate 100 on which the light-emitting element 121 is located. Therefore, compared to the case where the temperature detection unit 231 is located on the substrate 100, this has the effect of not increasing the pitch of the light-emitting elements 121 on the substrate 100. In other words, it becomes possible to increase the resolution of the light-emitting region 120. Furthermore, by locating the temperature detection unit 231 in the overlapping region 230, the distance between the temperature detection unit 231 and the light-emitting element 121, which is not only temperature-dependent in its light-emitting characteristics but also a heat source, can be reduced. As a result, the accuracy of temperature measurement is improved. In this case, it is not necessary for any other substrate to be located between the substrate 100 and the substrate 200. Also, by locating the temperature detection unit 231 in the overlapping region 230, the light-emitting device 10 can be miniaturized. In this way, a light-emitting device 10 that can accurately detect the temperature of the light-emitting region 120 can be obtained while enabling higher resolution and miniaturization of the light-emitting region 120, thereby improving the display quality of the light-emitting device 10.

[0021] Figure 2 shows a modified example of the light-emitting device 10 shown in Figure 1. The light-emitting device 11 in this embodiment differs from the light-emitting device 10 described above in the number of temperature detection units 231 arranged in the overlapping region 230, the number of temperature data 232 input from the temperature detection units 231 to the control circuit 220, and the method of generating the correction signal 221 in the control circuit 220. The other configurations of the light-emitting device 11 may be the same as those of the light-emitting device 10 described above, so the differences will be explained in detail, and explanations of similar points will be omitted as appropriate.

[0022] As shown in Figure 2, in the light-emitting device 11, multiple temperature detection units 231 are arranged in an overlapping region 230. For example, as shown in Figure 2, one temperature detection unit 231 may be arranged in each of multiple regions 233 obtained by dividing the overlapping region 230 evenly in the row direction and evenly in the column direction. In other words, among the multiple temperature detection units 231, those temperature detection units 231 that are aligned along one imaginary line 251 in the row direction may be arranged at a constant pitch. Similarly, among the multiple temperature detection units 231, those temperature detection units 231 that are aligned along one imaginary line 252 in the column direction may be arranged at a constant pitch.

[0023] Each of the multiple temperature sensing units 231 outputs the detected temperature data 232 to the control circuit 220. The control circuit 220 generates a correction signal 221 according to the multiple temperature data 232 detected by the multiple temperature sensing units 231. For example, the control circuit 220 may calculate the above-mentioned temperature-corrected coefficient based on the average value of the multiple temperature data 232 and output it to the drive circuit 210 as a correction signal 221. The drive circuit 210 corrects the drive signal corresponding to the video signal 21 input from the external system 20 according to the correction signal 221 input from the control circuit 220 and outputs it to the vertical scanning circuit 111 as a drive signal 211.

[0024] The light-emitting device 11 shown in Figure 2 has multiple temperature detection units 231 in the overlapping region 230, compared to the light-emitting device 10 shown in Figure 1. This increases the number of light-emitting elements 121, which are also heat sources, that are close to the temperature detection units 231, thereby improving the accuracy of temperature measurement. In addition, a correction signal 221 is generated from multiple temperature data 232. For example, the control circuit 220 generates the correction signal 221 based on the average value of multiple temperature data 232 detected by the multiple temperature detection units 231. Therefore, the effects of errors in each temperature detection unit 231 can be reduced. As a result, the light-emitting device 11 can improve the accuracy of temperature measurement compared to the light-emitting device 10.

[0025] Figure 3 shows a modified example of the light-emitting device 10 shown in Figure 2. In this embodiment, the light-emitting device 12 differs from the light-emitting device 11 in the number of temperature detection units 231 arranged in the overlapping region 230 and the number of temperature data 232 input from the temperature detection units 231 to the control circuit 220. The other configurations of the light-emitting device 12 may be the same as those of the light-emitting device 11, so the differences will be explained in detail, and explanations of similar aspects will be omitted as appropriate.

[0026] In the light-emitting device 11, one temperature detection unit 231 is placed in each of the multiple regions 233 obtained by dividing the overlapping region 230 evenly in the row direction and evenly in the column direction. On the other hand, the light-emitting device 12 has a configuration that includes regions 233 in which no temperature detection units 231 are placed. More specifically, the multiple temperature detection units 231 include five temperature detection units 231 placed in the center and at each of the four corners of the overlapping region 230. In this case, as shown in Figure 3, the multiple temperature detection units 231 may also include two temperature detection units 231 (a combination of temperature detection units 231a and 231b, or a combination of temperature detection units 231c and 231d) placed in positions symmetrical with respect to a virtual line 261 extending in the row direction that divides the overlapping region 230 into two equal parts. Similarly, the multiple temperature sensing units 231 may include two temperature sensing units 231 (a combination of temperature sensing units 231a and 231c, or a combination of temperature sensing units 231b and 231d) positioned symmetrically with respect to a virtual line 262 extending in the column direction that bisects the overlapping region 230. In addition, in the configuration shown in Figure 3, the multiple temperature sensing units 231 further include a temperature sensing unit 231e positioned in the center of the overlapping region 230.

[0027] In the light-emitting device 12 shown in Figure 3, the number of temperature detection units 231 arranged in the overlapping region 230 is appropriately reduced compared to the light-emitting device 11 shown in Figure 2. However, by arranging multiple temperature detection units 231, the temperature measurement accuracy can be improved, similar to the light-emitting device 11. Furthermore, because the number of temperature detection units 231 arranged on the substrate 200 is less than in the light-emitting device 11, processing blocks other than the temperature detection units 231 can be arranged in the overlapping region 230. Therefore, this is effective in miniaturizing the light-emitting device 12.

[0028] Furthermore, while Figure 3 shows an example where the overlapping region 230 is divided into nine regions 233, and temperature detection units 231 are placed in the central and four corner regions 233, the configuration is not limited to this. The overlapping region 230 can be divided into more regions 233, and the temperature detection units 231 can be placed as appropriate. In this case, as described above, by placing the temperature detection units 231 at positions symmetrical with respect to the imaginary lines 261 and 262, the temperature can be detected more uniformly in the overlapping region 230. Alternatively, for example, two temperature detection units 231 may be placed at positions symmetrical with respect to the center of the overlapping region 230.

[0029] Figure 4 shows a modified example of the light-emitting device 10 shown in Figure 2. The light-emitting device 13 in this embodiment differs from the light-emitting device 11 described above in the number of temperature detection units 231 arranged in the overlapping region 230, the number of temperature data 232 input from the temperature detection units 231 to the control circuit 220, and the method of generating the correction signal 221 in the control circuit 220. The other configurations of the light-emitting device 13 may be the same as those of the light-emitting device 11 described above, so the differences will be explained in detail, and explanations of similar points will be omitted as appropriate.

[0030] In the light-emitting device 12, the control circuit 220 generates a correction signal 221 based on the average value of multiple temperature data 232 detected by multiple temperature detection units 231. On the other hand, in the light-emitting device 13, the control circuit 220 generates a correction signal 221 based on the temperature data corresponding to the position of the light-emitting element 121, from among the multiple temperature data 232 detected by the multiple temperature detection units 231, for which the drive circuit 210 generates a drive signal 211. The configuration and operation of the light-emitting device 13 will be described in detail below.

[0031] In the light-emitting device 13, m light-emitting elements 121 are arranged in the row direction in the light-emitting region 120, and the drive circuit 210 simultaneously supplies drive signals 211 to n light-emitting elements 121 in the row direction. At this time, of the multiple temperature-sensing elements 231, the temperature-sensing elements 231 arranged on one virtual line 271 along the row direction are arranged one by one in each region obtained by dividing the overlapping region 230 into (m / n) equal parts in the row direction. Similarly, p light-emitting elements 121 are arranged in the column direction in the light-emitting region 120, and the drive circuit 210 simultaneously supplies drive signals 211 to q light-emitting elements 121 in the column direction. At this time, of the multiple temperature-sensing elements 231, the temperature-sensing elements 231 arranged on one virtual line 272 along the column direction are arranged one by one in each region obtained by dividing the overlapping region 230 into (p / q) equal parts in the column direction.

[0032] As described above, a total of four light-emitting elements 121 are driven simultaneously: two in the row direction and two in the column direction. In the configuration shown in Figure 4, eight light-emitting elements 121 are arranged in the row direction and six in the column direction within the light-emitting region 120. Therefore, one temperature detection unit 231 is placed in each region 233, which is obtained by dividing the overlapping region 230 equally into four regions in the row direction (8 divided by 2) and three regions in the column direction (6 divided by 2). Temperature data 232 is sent from the temperature detection unit 231 in each region 233 to the control circuit 220. As shown in Figure 4, among the multiple temperature detection units 231, those arranged on one virtual line 271 along the row direction may be arranged at a constant pitch. Also, among the multiple temperature detection units 231, those arranged on one virtual line 272 along the column direction may be arranged at a constant pitch.

[0033] Next, the control circuit 220 calculates a temperature-corrected coefficient from multiple temperature data 232 according to the temperature distribution of region 230. Specifically, from among the multiple temperature data 232, it selects one temperature data 232 from a temperature detection unit 231 located in region 233 close to the light-emitting element 121, which is then driven by the drive circuit 210 via the operating circuit 110. The control circuit 220 calculates a temperature-corrected coefficient from the selected temperature data 232 and outputs it to the drive circuit 210 as a correction signal 221. The key point of this embodiment is the arrangement of the temperature detection unit 231, or in other words, the method of setting region 233. If the temperature detection unit 231 is not arranged as in this embodiment, it may become difficult to apply processing according to the temperature distribution of the light-emitting region 120. This point will be explained in detail below.

[0034] Figure 5 shows an example of the configuration of the control circuit 220 of the light-emitting device 13. The count circuit 222 counts the number of times a signal output control signal is sent from the external system 20 to the signal output circuit 112 and outputs it to the temperature data control circuit 223 as drive element position information 225. The temperature data control circuit 223 has a multiplexer to which the drive element position information 225 is input to a selection signal terminal and multiple temperature data 232 are each input to an input signal terminal, and outputs the output signal of the multiplexer to the correction signal generation circuit 224 as selected temperature data 226. The correction signal generation circuit 224 calculates the above-mentioned temperature-corrected coefficient from the selected temperature data 226 and outputs it to the drive circuit 210 as a correction signal 221. Through the above process, the control circuit 220 selects one temperature data 232 from among multiple temperature data 232 output from multiple temperature detection units 231, the temperature data 232 of the temperature detection unit 231 located in the region 233 closest to the light-emitting element 121 to be driven next. For example, the control circuit 220 can select from among multiple temperature data 232 output from multiple temperature sensing units 231 that is located in the region 233 closest to the next light-emitting element 121 to be driven.

[0035] Figures 6(a) and 6(b) show the positional relationship between the light-emitting element 121, which is driven at a given time, and the region 233 where one temperature detection unit 231 is located. The light-emitting region 120 contains a group of light-emitting elements 122, which includes four light-emitting elements 121 that are driven next. Figure 6(a) shows the case where the temperature detection unit 231 (region 233) is arranged as described above. In other words, among the multiple temperature detection units 231, those arranged on one imaginary line 271 along the row direction are arranged one in each region obtained by dividing the overlapping region 230 into equal parts (m / n(8 / 2)) in the row direction. Similarly, among the multiple temperature detection units 231, those arranged on one imaginary line 272 along the column direction are arranged one in each region obtained by dividing the overlapping region 230 into equal parts (p / q(6 / 2)) in the column direction. At this time, within the overlapping region 230, there is a region 234 in which the temperature detection unit 231 is located, which overlaps with the next to be driven light-emitting group 122 in the orthogonal projection onto the main surface of the substrate 100 where the light-emitting region 120 is located. By arranging the temperature detection unit 231 (region 233) in this way, the region 234 in which the temperature detection unit 231 overlaps with the next to be driven light-emitting group 122 is uniquely determined.

[0036] On the other hand, Figure 6(b) is a counterexample to Figure 6(a), showing the case where the overlapping region 230 is divided into three equal parts in the row direction and two equal parts in the column direction. In this way, when the temperature sensing unit 231 (region 233) is arranged, multiple regions 233 are included in the region that overlaps with the next light-emitting element group 122 to be driven, and the position of the next light-emitting element 121 to be driven and the position of the region 233 closest to that light-emitting element 121 cannot be uniquely determined.

[0037] In other words, as described above, the number of temperature sensing units 231 (regions 233) is set appropriately. By doing so, the control circuit 220 can select the temperature data 232 output from the temperature sensing unit 231 adjacent to the position of the next light-emitting element group 122 to be driven as the selected temperature data 226 simply by counting the number of inputs of the signal output control signal indicating the number of drives in the row direction sent from the external system 20 to the signal output circuit 112.

[0038] Thus, the control circuit 220 can generate a correction signal 221 according to the temperature distribution occurring in the light-emitting region 120 of the substrate 100. Therefore, the display quality of the light-emitting device 13 can be improved. Furthermore, as described above, the temperature data 232 output from a temperature detection unit 231 located at an appropriate position among the multiple temperature detection units 231 can be obtained with a simple circuit configuration. In other words, the cost of generating the correction signal 221 (calculating the temperature-corrected coefficient) can be suppressed. As a result, the temperature of the light-emitting region 120 can be detected and the drive signal correction for each light-emitting element 121 located in the light-emitting region 120 can be achieved at low cost.

[0039] In the explanation using Figure 4, four light-emitting elements 121 are driven simultaneously, two in the row direction and two in the column direction, and a temperature detection unit 231 (region 233) is arranged to correspond to each of the light-emitting element groups 122 composed of the four light-emitting elements 121. However, this is not the only way. For example, consider the case where a light-emitting element group 122 is composed of four light-emitting elements 121, two in the row direction and two in the column direction. In this case, for example, one temperature detection unit 231 (region 233) may be arranged to correspond to each of the four light-emitting element groups 122, two in the row direction and two in the column direction. It is sufficient that the light-emitting element group 122 to be driven and the temperature detection unit 231 are arranged in a way that is uniquely determined.

[0040] Here, application examples of the light-emitting devices 10 to 13 of this embodiment applied to display devices, photoelectric converters, electronic devices, lighting devices, mobile devices, and wearable devices will be described using Figures 7 to 13(a) and 16(b). In the following description, it will be assumed that an organic electroluminescent (EL) element is used as the light-emitting element 121. In addition, the light-emitting element 121 may be referred to as a "pixel," and the light-emitting area 120 may be referred to as a "display area." First, the details and modified versions of each configuration of the light-emitting devices 10 to 13 described above will be shown, and then the application examples will be described.

[0041] Structure of an organic light-emitting device An organic light-emitting element is provided on a substrate by forming an insulating layer, a first electrode, an organic compound layer, and a second electrode. A protective layer, a color filter, a microlens, etc., may be provided on the cathode. If a color filter is provided, a planarization layer may be provided between it and the protective layer. The planarization layer can be made of acrylic resin or the like. The same applies when a planarization layer is provided between the color filter and the microlens.

[0042] substrate Examples of substrates include quartz, glass, silicon wafers, resins, and metals. The substrate may also be equipped with switching elements such as transistors and wiring, and an insulating layer may be provided on top of them. The insulating layer can be made of any material that allows for the formation of contact holes between it and the first electrode, while ensuring insulation from wiring that is not connected. For example, resins such as polyimide, silicon oxide, and silicon nitride can be used.

[0043] electrode A pair of electrodes can be used. The pair of electrodes may be an anode and a cathode. When an electric field is applied in the direction in which the organic light-emitting element emits light, the electrode with the higher potential is the anode, and the other is the cathode. Alternatively, the electrode that supplies holes to the light-emitting layer can be the anode, and the electrode that supplies electrons can be the cathode.

[0044] For the anode, materials with the largest possible work function are preferable. For example, elemental metals such as gold, platinum, silver, copper, nickel, palladium, cobalt, selenium, vanadium, and tungsten, or mixtures containing these, or alloys combining them, as well as metal oxides such as tin oxide, zinc oxide, indium oxide, tin-indium oxide (ITO), and zinc-indium oxide can be used. Conductive polymers such as polyaniline, polypyrrole, and polythiophene can also be used.

[0045] These electrode materials may be used individually or in combination of two or more types. Furthermore, the anode may consist of a single layer or multiple layers.

[0046] When used as a reflective electrode, materials such as chromium, aluminum, silver, titanium, tungsten, molybdenum, or alloys or laminates thereof can be used. It is also possible to use the above materials as a reflective film without serving as an electrode. Furthermore, when used as a transparent electrode, oxide transparent conductive layers such as indium tin oxide (ITO) or indium zinc oxide can be used, but are not limited to these. Photolithography can be used to form the electrodes.

[0047] On the other hand, materials with a small work function are preferred for the cathode. Examples include alkali metals such as lithium, alkaline earth metals such as calcium, and elemental metals or mixtures containing aluminum, titanium, manganese, silver, lead, and chromium. Alternatively, alloys combining these elemental metals can also be used. For example, magnesium-silver, aluminum-lithium, aluminum-magnesium, silver-copper, and zinc-silver can be used. Metal oxides such as indium tin oxide (ITO) can also be used. These electrode materials may be used individually or in combination of two or more. The cathode may also be a single-layer or multi-layer structure. Among these, silver is preferred, and a silver alloy is even more preferred to reduce silver aggregation. The alloy ratio is not important as long as silver aggregation is reduced. For example, the ratio of silver to other metals may be 1:1, 3:1, etc.

[0048] The cathode may be a top-emission element using an oxide conductive layer such as ITO, or a bottom-emission element using a reflective electrode such as aluminum (Al), and is not particularly limited. The method for forming the cathode is not particularly limited, but using DC and AC sputtering methods is more preferable because it provides good film coverage and makes it easier to reduce resistance.

[0049] Pixel separation layer The pixel separation layer is formed from a silicon nitride (SiN), silicon oxynitride (SiON), or silicon oxide (SiO) film, which is formed using chemical vapor deposition (CVD). To increase the in-plane resistance of the organic compound layer, it is preferable that the thickness of the organic compound layer, particularly the hole transport layer, be thinly deposited on the sidewalls of the pixel separation layer. Specifically, by increasing the taper angle of the sidewalls of the pixel separation layer and the thickness of the pixel separation layer, the vignetting during deposition can be increased, thereby thinning the film thickness on the sidewalls.

[0050] On the other hand, it is preferable to adjust the taper angle of the sidewalls of the pixel isolation layer and the thickness of the pixel isolation layer to such an extent that no voids are formed in the protective layer formed on top of it. Since no voids are formed in the protective layer, the occurrence of defects in the protective layer can be reduced. Since the occurrence of defects in the protective layer is reduced, reliability degradation such as the occurrence of dark spots and poor conductivity of the second electrode can be reduced.

[0051] According to this embodiment, charge leakage to adjacent pixels can be effectively suppressed even if the taper angle of the sidewall of the pixel isolation layer is not steep. This study found that sufficient reduction is possible when the taper angle is in the range of 60 degrees to 90 degrees. The thickness of the pixel isolation layer is preferably between 10 nm and 150 nm. Similar effects can also be obtained even if the device consists only of pixel electrodes without a pixel isolation layer. However, in this case, it is preferable to make the thickness of the pixel electrode less than half the thickness of the organic layer, or to make the pixel electrode ends have a forward taper of less than 60°, as this reduces short circuits in the organic light-emitting element.

[0052] Furthermore, even when the first electrode is the cathode and the second electrode is the anode, a wide color gamut and low-voltage driving are possible by forming an electron-transporting material and a charge transport layer that satisfy conditions (1) and (2), and by forming a light-emitting layer on the charge transport layer.

[0053] organic compound layer The organic compound layer may be formed as a single layer or as multiple layers. If there are multiple layers, they may be called a hole injection layer, a hole transport layer, an electron blocking layer, an emissive layer, a hole blocking layer, an electron transport layer, or an electron injection layer, depending on their function. The organic compound layer is mainly composed of organic compounds, but may also contain inorganic atoms and inorganic compounds. For example, it may contain copper, lithium, magnesium, aluminum, iridium, platinum, molybdenum, zinc, etc. The organic compound layer may be placed between the first electrode and the second electrode, or it may be placed in contact with the first electrode and the second electrode.

[0054] protective layer A protective layer may be provided on the cathode. For example, by bonding glass with a desiccant to the cathode, the intrusion of water and other substances into the organic compound layer can be reduced, thereby reducing the occurrence of display defects. In another embodiment, a passivation film such as silicon nitride may be provided on the cathode to reduce the intrusion of water and other substances into the organic compound layer. For example, after forming the cathode, it may be transported to another chamber without breaking the vacuum and a silicon nitride film with a thickness of 2 μm may be formed by the CVD method to serve as a protective layer. A protective layer may also be provided using atomic deposition (ALD) after the film formation by the CVD method. The material of the film formed by the ALD method is not limited, but may be silicon nitride, silicon oxide, aluminum oxide, etc. Silicon nitride may be further formed on the film formed by the ALD method by the CVD method. The film formed by the ALD method may have a thinner film thickness than the film formed by the CVD method. Specifically, it may be 50% or less, or even 10% or less.

[0055] Color filter A color filter may be provided on top of the protective layer. For example, a color filter that takes into account the size of the organic light-emitting element may be provided on a separate substrate and bonded to the substrate on which the organic light-emitting element is provided, or a color filter may be patterned on the protective layer as described above using photolithography technology. The color filter may be made of polymer.

[0056] flattening layer A planarizing layer may be provided between the color filter and the protective layer. The planarizing layer is provided to reduce the unevenness of the layer below. It may also be called a material resin layer without limiting its purpose. The planarizing layer may be composed of an organic compound, which may be low molecular weight or high molecular weight, but high molecular weight is preferred.

[0057] The planarization layer may be provided above or below the color filter, and its constituent materials may be the same or different. Specifically, examples include polyvinylcarbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenolic resin, epoxy resin, silicone resin, urea resin, etc.

[0058] Microlens An organic light-emitting device may have optical elements such as microlenses on its light-emitting side. Microlenses may be made of acrylic resin, epoxy resin, or the like. Microlenses may be used to increase the amount of light extracted from the organic light-emitting device or to control the direction of the extracted light. Microlenses may have a hemispherical shape. If they have a hemispherical shape, among the tangents tangent to the hemisphere, there is a tangent parallel to the insulating layer, and the point of contact between that tangent and the hemisphere is the vertex of the microlens. The vertex of the microlens can be similarly determined in any cross-sectional view. That is, among the tangents tangent to the semicircle of the microlens in the cross-sectional view, there is a tangent parallel to the insulating layer, and the point of contact between that tangent and the semicircle is the vertex of the microlens.

[0059] Furthermore, the midpoint of a microlens can also be defined. In the cross-section of a microlens, a line segment can be imagined from the point where one arc ends to the point where another arc ends, and the midpoint of this line segment can be called the midpoint of the microlens. The cross-section used to determine the vertices and midpoints may be a cross-section perpendicular to the insulating layer.

[0060] A microlens has a first surface with a convex portion and a second surface opposite to the first surface. It is preferable that the second surface is positioned closer to the functional layer than the first surface. To adopt such a configuration, it is necessary to form the microlens on the light-emitting device. If the functional layer is an organic layer, it is preferable to avoid processes that involve high temperatures during the manufacturing process. Furthermore, when adopting a configuration in which the second surface is positioned closer to the functional layer than the first surface, it is preferable that the glass transition temperatures of all organic compounds constituting the organic layer are 100°C or higher, and more preferably 130°C or higher.

[0061] Opposing board A counter substrate may be provided on the planarized layer. The counter substrate is called a counter substrate because it is provided in a position corresponding to the aforementioned substrate. The constituent material of the counter substrate may be the same as that of the aforementioned substrate. The counter substrate may be the second substrate if the aforementioned substrate is referred to as the first substrate.

[0062] organic layer The organic compound layer (hole injection layer, hole transport layer, electron blocking layer, light-emitting layer, hole blocking layer, electron transport layer, electron injection layer, etc.) constituting the organic light-emitting element according to one embodiment of the present invention is formed by the method shown below.

[0063] The organic compound layer constituting the organic light-emitting element according to one embodiment of the present invention can be formed using a dry process such as vacuum deposition, ionization deposition, sputtering, or plasma deposition. Alternatively, instead of a dry process, a wet process can be used in which the layer is formed by dissolving the compound in a suitable solvent and applying a known coating method (e.g., spin coating, dipping, casting, LB method, inkjet method, etc.).

[0064] When layers are formed using methods such as vacuum deposition or solution coating, crystallization is less likely to occur, resulting in excellent stability over time. Furthermore, when forming films using coating methods, it is possible to combine the film with an appropriate binder resin.

[0065] Examples of the binder resins mentioned above include, but are not limited to, polyvinylcarbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenolic resin, epoxy resin, silicone resin, and urea resin.

[0066] Furthermore, these binder resins may be used individually as homopolymers or copolymers, or as a mixture of two or more types. Additionally, known additives such as plasticizers, antioxidants, and UV absorbers may be used in combination as needed.

[0067] Pixel circuit The light-emitting device may have a pixel circuit connected to a light-emitting element. The pixel circuit may be an active-matrix type that independently controls the light emission of a first light-emitting element and a second light-emitting element. The active-matrix type circuit may be voltage-programmed or current-programmed. The drive circuit has a pixel circuit for each pixel. The pixel circuit may have a light-emitting element, a transistor that controls the light emission brightness of the light-emitting element, a transistor that controls the light emission timing, a capacitor that holds the gate voltage of the transistor that controls the light emission brightness, and a transistor for connecting to GND without going through the light-emitting element.

[0068] The light-emitting device has a display area and a peripheral area arranged around the display area. The display area has a pixel circuit, and the peripheral area has a display control circuit. The mobility of the transistors constituting the pixel circuit may be smaller than the mobility of the transistors constituting the display control circuit.

[0069] The slope of the current-voltage characteristics of the transistors constituting the pixel circuit can be smaller than the slope of the current-voltage characteristics of the transistors constituting the display control circuit. The slope of the current-voltage characteristics can be measured using the so-called Vg-Ig characteristic.

[0070] The transistors that make up the pixel circuit are transistors connected to light-emitting elements, such as the first light-emitting element.

[0071] pixels The organic light-emitting device has multiple pixels. Each pixel has subpixels that emit light of a different color from the others. The subpixels may each have, for example, RGB light-emitting colors.

[0072] A pixel emits light in a region also called the pixel aperture. This region is the same as the first region. The pixel aperture may be 15 μm or less, or 5 μm or more. More specifically, it may be 11 μm, 9.5 μm, 7.4 μm, 6.4 μm, etc.

[0073] The distance between subpixels may be 10 μm or less, specifically 8 μm, 7.4 μm, or 6.4 μm.

[0074] Pixels can take on known arrangements in a plan view. For example, they may be in a stripe arrangement, delta arrangement, pentile arrangement, or Bayer arrangement. The shape of subpixels in a plan view may be any known shape. For example, rectangles, rhombuses, hexagons, etc. Of course, even if it is not a precise shape, if it is close to a rectangle, it is included in the category of rectangles. The shape of subpixels and the pixel arrangement can be used in combination.

[0075] Applications of the organic light-emitting element according to one embodiment of the present invention An organic light-emitting element according to one embodiment of the present invention can be used as a component of a display device or lighting device. Other applications include exposure light sources for electrophotographic image forming apparatuses, backlights for liquid crystal display devices, and light-emitting devices with a color filter in a white light source.

[0076] The display device may also be an image information processing device that has an image input unit for receiving image information from an area CCD, linear CCD, memory card, etc., an information processing unit for processing the input information, and displays the input image on the display unit.

[0077] Furthermore, the display unit of the imaging device or inkjet printer may have a touch panel function. The driving method for this touch panel function may be infrared, capacitive, resistive, or electromagnetic induction, and is not particularly limited. The display device may also be used as the display unit of a multifunction printer.

[0078] The following will explain in detail the application examples of the light-emitting devices 10 to 13 using Figures 7 to 13(a) and 13(b).

[0079] Figure 7 is a schematic diagram showing an example of a display device using the light-emitting devices 10-13 of 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 the upper cover 1001 and the lower cover 1009. Flexible printed circuits FPCs 1002 and 1004 are connected to the touch panel 1003 and the display panel 1005. Active elements such as transistors are arranged on the circuit board 1007. The battery 1008 does not need to be provided if the display device 1000 is not a portable device, and even if it is a portable device, it does not need to be provided in this position. The light-emitting devices 10-13 can be applied to the display panel 1005. The light-emitting area 120 of the light-emitting devices 10-13 that function as the display panel 1005 is connected to and operates with active elements such as transistors arranged on the circuit board 1007.

[0080] The display device 1000 shown in Figure 7 may be used as the display unit of a photoelectric conversion device (imaging device) having an optical unit with multiple lenses and an image sensor that receives light passing through the optical unit and converts it into an electrical signal. The photoelectric conversion device may have a display unit that displays information acquired by the image sensor. Furthermore, the display unit may be an external display unit exposed to the outside of the photoelectric conversion device, or a display unit located inside the viewfinder. The photoelectric conversion device may be a digital camera or a digital video camera.

[0081] Figure 8 is a schematic diagram showing an example of a photoelectric converter using the light-emitting devices 10-13 of this embodiment. The photoelectric converter 1100 may have a viewfinder 1101, a rear display 1102, an operating unit 1103, and a housing 1104. The photoelectric converter 1100 may also be called an imaging device. The light-emitting devices 10-13 of this embodiment can be applied to the display unit, which is the viewfinder 1101 or the rear display 1102. In this case, the light-emitting area 120 of the light-emitting devices 10-13 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, and the possibility of the subject being obscured by an obstacle.

[0082] Since the optimal timing for imaging is often very short, it is desirable to display information as quickly as possible. Therefore, light-emitting devices 10-13, in which light-emitting elements 121 made of organic light-emitting materials such as organic EL elements are arranged in the light-emitting region 120, may be used in the viewfinder 1101 and the rear display 1102. This is because organic light-emitting materials have a fast response speed. Light-emitting devices 10-13 using organic light-emitting materials are more suitable than liquid crystal displays for these devices where display speed is required.

[0083] The photoelectric converter 1100 has an optical section (not shown). The optical section has multiple lenses, and the light that passes through the optical section is imaged onto a photoelectric converter element (not shown) housed in a light-receiving housing 1104. The focus can be adjusted by adjusting the relative positions of the multiple lenses. This operation can also be performed automatically.

[0084] The light-emitting devices 10-13 may be applied to the display section of an electronic device. In this case, they may have both a display function and an operating function. Examples of portable terminals include smartphones and other mobile phones, tablets, and head-mounted displays.

[0085] Figure 9 is a schematic diagram showing an example of an electronic device using the light-emitting devices 10-13 of 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 1202 may also be a biometric recognition unit that recognizes fingerprints to unlock, etc. A portable device having a communication unit can also be called a communication device. The light-emitting devices 10-13 of this embodiment can be applied to the display unit 1201.

[0086] Figures 10(a) and 10(b) are schematic diagrams showing an example of a display device using the light-emitting devices 10 to 13 of this embodiment. Figure 10(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 devices 10 to 13 of this embodiment can be applied to the display unit 1302. The display device 1300 may also have a base 1303 that supports the frame 1301 and the display unit 1302. The base 1303 is not limited to the form shown in Figure 10(a). For example, the lower edge of the frame 1301 may also serve as the base 1303. Also, 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.

[0087] Figure 10(b) is a schematic diagram showing another example of a display device using the light-emitting devices 10-13 of this embodiment. The display device 1310 in Figure 10(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 light-emitting devices 10-13 of this embodiment can be applied to the first display unit 1311 and the second display unit 1312. 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 by a bending point. The first display unit 1311 and the second display unit 1312 may each display different images, or they may display a single image together.

[0088] Figure 11 is a schematic diagram showing an example of a lighting device using the light-emitting devices 10-13 of 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-emitting devices 10-13 of this embodiment can be applied to the light source 1402. The optical film 1404 may be a filter that improves the color rendering of the light source. The light diffusion unit 1405 can effectively diffuse the light from the light source, such as for lighting up, and deliver light over a wide area. A cover may be provided on the outermost part as needed. The lighting device 1400 may have both the optical film 1404 and the light diffusion unit 1405, or it may have only one of them.

[0089] The lighting device 1400 is, for example, a device for illuminating a room. The lighting device 1400 may emit white light, daylight white light, or any other color from blue to red. It may have a dimming circuit for adjusting the brightness of these colors. The lighting device 1400 may have a power supply circuit connected to the light-emitting area 120 of the light-emitting devices 10-13, which function as light sources 1402. The power supply circuit is a circuit that converts AC voltage to DC voltage. White light has a color temperature of 4200K, and daylight white light has a color temperature of 5000K. The lighting device 1400 may also have a color filter. The lighting device 1400 may also 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.

[0090] Figure 12 is a schematic diagram of an automobile having a taillight, which is an example of a vehicle light fixture using the light-emitting devices 10-13 of this embodiment. The automobile 1500 may have a taillight 1501, which may be illuminated when the brakes are applied or otherwise. The light-emitting devices 10-13 of this embodiment may also be used as headlights for a vehicle. The automobile is an example of a mobile body, which may be a ship, drone, aircraft, railway vehicle, industrial robot, etc. The mobile body may have a body and a light fixture installed thereon. The light fixture may indicate the current position of the body.

[0091] The light-emitting devices 10-13 of this embodiment can be applied to the tail lamp 1501. The tail lamp 1501 may have a protective member that protects the light-emitting area 120 of the light-emitting devices 10-13 that function as the tail lamp 1501. The protective member can be made of any material as long as it has a reasonably high strength and is transparent, but it may be made of polycarbonate or the like. The protective member may also be made of polycarbonate mixed with a frangic acid derivative, an acrylonitrile derivative, or the like.

[0092] The automobile 1500 may have a body 1503 and windows 1502 attached thereto. The windows may be for checking the front and rear of the automobile, or they may be transparent displays. The light-emitting devices 10 to 13 of this embodiment may be used for the transparent displays. In this case, the constituent materials such as electrodes of the light-emitting devices 10 to 13 are made of transparent materials.

[0093] Further application examples of the light-emitting devices 10-13 of this embodiment will be described with reference to Figures 13(a) and 13(b). The light-emitting devices 10-13 can be applied to systems that can be worn as wearable devices such as smart glasses, head-mounted displays (HMDs), and smart contact lenses. The imaging display device used in such application examples comprises an imaging device capable of photoelectric conversion of visible light and a light-emitting device capable of emitting visible light.

[0094] Figure 13(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 side of the lens 1601 of the glasses 1600. In addition, light-emitting devices 10 to 13 of this embodiment are provided on the back surface side of the lens 1601.

[0095] 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 light-emitting devices 10-13 according to each embodiment. The control device 1603 also controls the operation of the imaging device 1602 and the light-emitting devices 10-13. The lens 1601 has an optical system formed therein for focusing light onto the imaging device 1602.

[0096] Figure 13(b) illustrates a pair of glasses 1610 (smart glasses) according to one application example. The glasses 1610 have a control device 1612, which is equipped with an imaging device equivalent to an imaging device 1602 and light-emitting devices 10-13. The lens 1611 has an optical system formed to project the light emitted from the imaging device and light-emitting devices 10-13 within 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 light-emitting devices 10-13, and also controls the operation of the imaging device and light-emitting devices 10-13. The control device 1612 may have a gaze detection unit that detects the wearer's gaze. Gaze detection may use infrared light. The infrared light-emitting unit emits infrared light towards the eyeball of the user who is gazing at the displayed image. The imaging unit, which has a photodetector, detects the reflected light from the eyeball of the emitted infrared light, thereby obtaining an image of the eyeball. By having a reduction mechanism that reduces the amount of light transmitted from the infrared light-emitting part to the display part in a planar view, the degradation of image quality is reduced.

[0097] The user's gaze towards a 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. As an example, a gaze detection method based on the Purkinje image obtained by the reflection of the irradiated light from the cornea can be used.

[0098] 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.

[0099] The light-emitting devices 10 to 13 according to one embodiment of the present invention include an imaging device having a light-receiving element, and may control the displayed image based on the user's gaze information from the imaging device.

[0100] Specifically, the light-emitting devices 10-13 determine a first field of view area that the user is fixated on, and a second field of view area other than the first field of view area, based on gaze information. The first and second field of view areas may be determined by the control devices of the light-emitting devices 10-13, or they may be determined by an external control device and received. In the light-emitting areas of the light-emitting devices 10-13, the display resolution of the first field of view area may be controlled to be higher than the display resolution of the second field of view area. In other words, the resolution of the second field of view area may be lower than that of the first field of view area.

[0101] 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 display area and the second display area may be determined by the control devices of the light-emitting devices 10 to 13, 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 the area with relatively lower priority may be lowered.

[0102] AI may be used to determine the first field of view area and high-priority areas. The AI ​​may be a model configured to estimate the angle of line of sight and the distance to the target object at the end of the line of sight from the image of the eye, using the image of the eye and the direction the eye was actually looking in that image as training data. The AI ​​program may be owned by the light-emitting devices 10-13, the imaging device, or an external device. If owned by an external device, it is transmitted to the light-emitting devices 10-13 via communication.

[0103] 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.

[0104] The disclosures herein include the following light-emitting devices, display devices, photoelectric converters, and electronic devices.

[0105] (Item 1) A light-emitting device comprising a first substrate having a light-emitting region on which multiple light-emitting elements are arranged, and a second substrate on which a temperature sensing unit for detecting the temperature of the first substrate is arranged, stacked together, A light-emitting device characterized in that, in an orthogonal projection of the first substrate onto the main surface on which the light-emitting region is located, the temperature detection unit is located in an overlapping region of the second substrate that overlaps with the light-emitting region.

[0106] (Item 2) The device further includes a drive circuit that generates a drive signal for driving the plurality of light-emitting elements from a video signal input to the light-emitting device, and a control circuit that generates a correction signal according to the temperature data detected by the temperature detection unit, The light-emitting device according to item 1, characterized in that the drive circuit corrects the drive signal in accordance with the correction signal input from the control circuit.

[0107] (Item 3) The light-emitting device according to item 1 or 2, characterized in that the temperature sensing unit is located in the center of the overlapping region.

[0108] (Item 4) The light-emitting device according to any one of items 1 to 3, characterized in that a plurality of temperature-sensing units, including the temperature-sensing unit, are arranged in the overlapping region.

[0109] (Item 5) Multiple temperature detection units, including the aforementioned temperature detection unit, are arranged in the overlapping region. The light-emitting device according to item 2, characterized in that the control circuit generates the correction signal according to the plurality of temperature data detected by the plurality of temperature detection units.

[0110] (Item 6) The light-emitting device according to item 5, characterized in that the control circuit generates the correction signal based on the average value of a plurality of temperature data detected by the plurality of temperature sensing units.

[0111] (Item 7) The light-emitting device according to item 5, characterized in that the control circuit generates the correction signal based on temperature data corresponding to the position of the light-emitting element that generates the drive signal, from among a plurality of temperature data detected by the plurality of temperature sensing units.

[0112] (Item 8) The plurality of light-emitting elements are arranged in the light-emitting region to form rows and columns, The light-emitting device according to any one of items 4 to 7, characterized in that the temperature-sensing units, among the plurality of temperature-sensing units, which are arranged on one imaginary line along the row direction, are arranged at a constant pitch.

[0113] (Item 9) The light-emitting device according to item 8, characterized in that the temperature-sensing units, among the plurality of temperature-sensing units, which are arranged along one imaginary line in the column direction, are arranged at a constant pitch.

[0114] (Item 10) The plurality of light-emitting elements are arranged in the light-emitting region to form rows and columns, The light-emitting device according to any one of items 4 to 9, characterized in that the plurality of temperature sensing units include two temperature sensing units positioned symmetrically with respect to a virtual line extending in the row direction that divides the overlapping region into two equal parts.

[0115] (Item 11) The light-emitting device according to item 10, characterized in that the plurality of temperature sensing units further include two temperature sensing units positioned symmetrically with respect to a virtual line extending in the column direction that divides the overlapping region into two equal parts.

[0116] (Item 12) The light-emitting device according to item 11 or 12, characterized in that the plurality of temperature sensing units further include a temperature sensing unit located in the center of the overlapping region.

[0117] (Item 13) The light-emitting device according to any one of items 4 to 7, characterized in that the plurality of temperature sensing units include five temperature sensing units arranged in the center and at each of the four corners of the overlapping region.

[0118] (Item 14) The plurality of light-emitting elements are arranged in the light-emitting region to form rows and columns, The aforementioned light-emitting region has m light-emitting elements arranged in the row direction. The drive circuit simultaneously supplies the drive signal to n light-emitting elements in the row direction among the plurality of light-emitting elements. The light-emitting device according to item 7, characterized in that, of the plurality of temperature-sensing units, the temperature-sensing units arranged along one imaginary line in the row direction are arranged one in each region obtained by dividing the overlapping region into equal parts (m / n) in the row direction.

[0119] (Item 15) The light-emitting device according to item 14, characterized in that among the plurality of temperature-sensing units, the temperature-sensing units arranged along one imaginary line in the row direction are arranged at a constant pitch.

[0120] (Item 16) The light-emitting region has p light-emitting elements arranged in a row direction. The drive circuit simultaneously supplies the drive signal to q light-emitting elements in the column direction among the plurality of light-emitting elements. The light-emitting device according to item 14 or 15, characterized in that, among the plurality of temperature-sensing units, the temperature-sensing units arranged along one imaginary line in the column direction are arranged one in each region obtained by dividing the overlapping region into equal parts (p / q) in the column direction.

[0121] (Item 17) The light-emitting device according to item 16, characterized in that the temperature-sensing units, among the plurality of temperature-sensing units, which are arranged along one imaginary line in the direction of the column, are arranged at a constant pitch.

[0122] (Item 18) A display device comprising a light-emitting device described in any one of items 1 to 17, and an active element connected to the light-emitting device.

[0123] (Item 19) It comprises an optical unit having multiple lenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image. The photoelectric converter is characterized in that the display unit is a display unit that displays an image captured by the image sensor, and has a light-emitting device described in any one of items 1 to 17.

[0124] (Item 20) It comprises a housing on which a display unit is provided, and a communication unit provided in the housing for communicating with the outside, The display unit is an electronic device characterized by having a light-emitting device described in any one of items 1 to 17.

[0125] The invention is not limited to the embodiments described above, and various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, claims are attached to disclose the scope of the invention. [Explanation of symbols]

[0126] 10-13: Light-emitting device, 100, 200: Substrate, 120: Light-emitting area, 121: Light-emitting element, 230: Overlapping area, 231: Temperature detection unit

Claims

1. A first substrate having a light-emitting region on which multiple light-emitting elements are arranged, A second substrate is provided on which a plurality of temperature sensing units for detecting the temperature of the first substrate, A light-emitting device in which stacked elements are present. In the orthogonal projection of the first substrate onto the main surface on which the light-emitting region is located, the plurality of temperature detection units are arranged in the overlapping region of the second substrate that overlaps with the light-emitting region. A drive circuit that generates a drive signal to drive the plurality of light-emitting elements from the video signal input to the light-emitting device, The system further includes a control circuit that generates a correction signal corresponding to a plurality of temperature data detected by the plurality of temperature sensing units, The drive circuit corrects the drive signal according to the correction signal input from the control circuit. The plurality of light-emitting elements are arranged in the light-emitting region to form rows and columns, The aforementioned light-emitting region has m light-emitting elements arranged in the row direction. The drive circuit simultaneously supplies the drive signal to n of the plurality of light-emitting elements in the row direction, Of the plurality of temperature sensing units, the temperature sensing units that are aligned along one imaginary line in the row direction are arranged one in each region obtained by dividing the overlapping region into equal parts (m / n) in the row direction. The aforementioned light-emitting region has p light-emitting elements arranged in a row direction. The drive circuit simultaneously supplies the drive signal to q light-emitting elements in the column direction among the plurality of light-emitting elements. Of the plurality of temperature sensing units, the temperature sensing units that are aligned along one imaginary line in the column direction are arranged one in each region obtained by dividing the overlapping region into equal parts (p / q) in the column direction. The light-emitting device is characterized in that the control circuit generates the correction signal based on temperature data corresponding to the position of the light-emitting element that generates the drive signal, from among the plurality of temperature data detected by the plurality of temperature detection units.

2. The light-emitting device according to Claim 1, characterized in that the plurality of temperature sensing units include two temperature sensing units positioned symmetrically with respect to a virtual line extending in the row direction that divides the overlapping region into two equal parts.

3. The light-emitting device according to claim 2, wherein the plurality of temperature sensing units further include two temperature sensing units positioned symmetrically with respect to a virtual line extending in the column direction that divides the overlapping region into two equal parts.

4. The light-emitting device according to claim 2, characterized in that the plurality of temperature sensing units further include a temperature sensing unit located in the center of the overlapping region.

5. The light-emitting device according to claim 1, characterized in that the plurality of temperature sensing units include five temperature sensing units arranged in the center and at each of the four corners of the overlapping region.

6. The light-emitting device according to claim 1, characterized in that the temperature-sensing units, among the plurality of temperature-sensing units, that are arranged along one imaginary line in the row direction are arranged at a constant pitch.

7. The light-emitting device according to claim 1, characterized in that the temperature-sensing units, among the plurality of temperature-sensing units, that are arranged along one imaginary line in the direction of the column are arranged at a constant pitch.

8. A display device comprising a light-emitting device according to any one of claims 1 to 7, and an active element connected to the light-emitting device.

9. It comprises an optical unit having multiple lenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image. The photoelectric converter is characterized in that the display unit is a display unit that displays an image captured by the image sensor, and has a light-emitting device according to any one of claims 1 to 7.

10. It comprises a housing on which a display unit is provided, and a communication unit provided in the housing for communicating with the outside, The display unit is an electronic device characterized by having a light-emitting device according to any one of claims 1 to 7.

Images