JP2006269284A - Self luminous display panel and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To take measures against inconveniencies that a drive circuit block does not need additional parts and circuits to resolve the temperature dependency of light emission luminance, does not require occupation space increased, and does not face cost rise of the whole device. <P>SOLUTION: In a self luminous display panel, a self luminous element 1 is arranged on a support substrate 10, where the self luminous element 1 has a first electrode 11, at least one or more layers of light emitting function layers 12 formed on the first electrode 11, and a second electrode 13, and the light emission luminance of the self luminous element 1 is caused by a voltage applied between the first and second electrodes 11, 13. At least one temperature compensation function layer 14 is laminated and formed in series to a supply route of the voltage applied between the first and second electrodes 11, 13, where the temperature compensation function layer 14 is made of a conductive material with a temperature-resistance characteristic similar to a temperature-resistance characteristic of the light emitting function layer 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a self-luminous display panel and a method for manufacturing the same.

  A self-luminous display panel equipped with a self-luminous element such as an organic EL (OEL) element as a display element enables a flat panel display, and displays lower power consumption and higher brightness than a liquid crystal display requiring a backlight. It is possible and is expected to enable a new display form such as a paper display.

  The self-light-emitting element as a display element of this self-light-emitting display panel has a basic structure in which a semiconductor layer having a pn junction is sandwiched between an anode (anode or hole injection electrode) and a cathode (cathode or electron injection electrode). In the case of a low molecular organic EL element, this semiconductor layer is formed by a laminated structure of an organic layer including a light emitting layer. In the case of a polymer organic EL element, a single layer of a bipolar material is formed. Alternatively, it is formed of an organic layer having a structure in which a plurality of layers are stacked. By applying a voltage to both the anode and cathode, holes injected and transported from the anode into the organic layer and electrons injected and transported from the cathode into the organic layer are transferred to the organic layer (for example, light emission). Recombination within the layer), and emits light by releasing energy from the excited state obtained by this recombination.

FIG. 1A shows voltage-current characteristics of the organic EL element. That is, if a drive voltage (forward voltage) exceeding the light emission threshold voltage _Vth is applied to the organic EL element, a light emission luminance L proportional to the current corresponding to the drive voltage is obtained, and the applied drive voltage V emits light. If the threshold voltage is equal to or lower than _Vth , no drive current flows and the light emission luminance remains equal to zero.

And as this voltage-current characteristic is described in the following patent document 1, the characteristic changes with temperature. That is, as shown in FIG. 1A, the organic EL element has a light emission luminance L obtained according to the flowing current I as the voltage V increases in a light emission possible region where the drive voltage is larger than the light emission threshold _Vth. has a larger characteristic, the lower the light emission threshold V _thw higher temperatures, the light emission threshold V _thc as temperature increases, the temperature of the low → high, emission luminance is obtained even in the L _1, L _2, L ₃ To change. Therefore, as shown in FIG. 1 (b), the relative luminance is lower and darker at a low temperature than the emission luminance obtained at room temperature (25 ° C.), and the relative luminance is increased at a high temperature. The phenomenon of brightening occurs.

  In this case, the light emission luminance characteristics change due to a change in the environmental temperature, which adversely affects the display performance. Therefore, even if the environmental temperature fluctuates, the organic EL element is maintained so that the substantial light emission luminance characteristics are kept constant. The following Patent Document 1 discloses that a temperature compensation circuit is incorporated in the driving circuit.

JP 2000-214824 A

  According to the above-described prior art, the ambient temperature or the operating temperature is detected by the temperature detection element (thermistor), and the result is fed back to the drive circuit system to increase or decrease the drive voltage (or current). According to a simple compensation method, components such as a thermistor and circuit elements for making the drive voltage (or drive current) variable are required outside the self-luminous display panel, and additional components are provided in the panel and the module including the panel. It will take space. This has been a major obstacle when trying to realize a thin display device with a self-luminous display panel.

  Further, when the circuit scale is increased by adding a compensation circuit to the drive circuit of the self-luminous display panel, there is a problem that the cost of the entire display device is increased.

  This invention makes it an example of a subject to cope with such a problem. That is, a self-luminous display panel that eliminates the need for additional components and circuits in the drive circuit system in order to eliminate the temperature dependence of the light emission luminance characteristics, and does not increase the occupied space or increase the cost of the entire device. Are the objects of the present invention.

  In order to achieve such an object, the present invention comprises at least the configurations according to the following independent claims.

  [Claim 1] A self-luminous element comprising a first electrode, at least one light emitting functional layer formed on the first electrode, and a second electrode formed on the light emitting functional layer. In the self-luminous display panel arranged on the support substrate and capable of obtaining the luminous luminance of the self-luminous element by the voltage applied between the first and second electrodes, A temperature compensation functional layer made of a conductive material having a temperature resistance characteristic of the same tendency is stacked in series with respect to the voltage supply path applied between the first and second electrodes. Luminescent display panel.

  [6] A self-luminous element comprising a first electrode, at least one or more light emitting functional layers formed on the first electrode, and a second electrode formed on the light emitting functional layer. In the method of manufacturing a self-luminous display panel that is arranged on a support substrate and obtains the light emission luminance of the self-luminous element by a voltage applied between the first and second electrodes, a film forming process in the self-luminous element A voltage supply path for applying a temperature compensation function layer made of a conductive material having a temperature resistance characteristic in the same tendency as the temperature emission luminance characteristic of the light emission function layer between before and after the first and second electrodes A self-luminous display panel manufacturing method comprising stacking at least one layer in series with respect to the substrate.

  Embodiments of the present invention will be described below with reference to the drawings. 2 and 3 are explanatory views illustrating a self-luminous display panel according to an embodiment of the present invention. In the following embodiment, an example of TFT (active matrix) driving is shown, but the self-luminous display panel according to the embodiment of the present invention is not limited to this, and other driving methods (for example, passive driving method) ) Can also be adopted.

  FIG. 2 is a cross-sectional view showing the element structure of the self-luminous display panel. The self-luminous display panel according to the embodiment of the present invention is such that the self-luminous element 1 is disposed on the support substrate 10. The self-luminous element 1 basically includes the first electrode 11 and the first electrode. It comprises at least one light emitting functional layer 12 formed on the electrode and a second electrode 13 formed on the light emitting functional layer 12, and is applied between the first electrode 11 and the second electrode 13. Light emission luminance can be obtained by voltage.

  More specifically, a TFT 20 (Thin Film Transistor) as a driving element is formed for each self-light emitting element 1 on the support substrate 10, and a planarizing film 21 made of a transparent insulating material is formed thereon, A connection hole 21 </ b> A is formed in the connection portion 20 </ b> A of the TFT 20. The first electrode 11 described above is divided and patterned for each self-luminous element 1 on the planarizing film 21, and is in contact with the connection portion 20A through the connection hole 21A.

  Further, the light emitting region S of the self light emitting element 1 is partitioned by the opening of the insulating film 22, and the light emitting functional layer 12 and the second electrode 13 are patterned in the opening on the first electrode 11.

  In this embodiment, at least one layer of the temperature compensation function layer 14 is laminated so as to be in contact with the second electrode 13, and the low resistance wiring layer 15 is further laminated thereon.

  This temperature compensation functional layer 14 is a layer made of a conductive material having a temperature resistance characteristic that has the same tendency as the thermoluminescent luminance characteristic of the light emitting functional layer 12, and a specific material has a resistance value as the temperature rises. Examples of such composite materials include a polymer composite material in which titanium carbide is dispersed in maleic acid-modified polyethylene, polypropylene, etc., and a composite material in which conductive carbon is dispersed in a crystalline polymer. It is not something. The low resistance wiring layer 15 can be formed of a low resistance metal material such as aluminum alone or an alloy.

  In this embodiment, the temperature compensation function layer 14 is laminated on the second electrode 13. The temperature compensation function layer 14 is applied between the first electrode 11 and the second electrode 13. It is a requirement that the voltage supply path, that is, the voltage supply path from the TFT 20 to the low resistance wiring layer 15 be provided in series.

  FIG. 3 shows the formation region of each layer in the self-light-emitting element 1 in a plan view. The first electrode 11 is slightly wider than the light-emitting region S defined by the opening of the insulating film 22. The temperature compensation function layer 14 is formed more widely than that.

  The operation of the self-luminous display panel according to such an embodiment will be described with reference to FIGS. FIG. 4 shows an equivalent circuit of the self-luminous display panel. As is clear from this figure, in the self-luminous display panel according to the embodiment of the present invention, the temperature compensation functional layer 14 is formed in series with the voltage supply path for applying a voltage to the self-luminous element 1. A driving voltage V is applied to the self-light emitting element 1 through the TFT 20 serving as a switching element.

  Here, as shown in FIG. 5, the temperature compensation functional layer 14 has a temperature resistance characteristic in which the resistance value Rt is relatively increased with respect to the temperature rise. The relative resistance value Rt of the temperature compensation function layer 14 formed in series with the self-light-emitting element 1 is increased, and the drive current I is decreased. As a result, even if the light emitting functional layer 12 of the self light emitting element 1 has a temperature emission luminance characteristic in which the luminance increases as the temperature increases, the increase in luminance is offset by the decrease in the driving current I described above. The temperature dependence of the emission luminance can be apparently reduced.

  As shown in FIG. 3, by adjusting the area of the temperature compensation functional layer 14 to be larger than the light emitting region S of the self light emitting element 1, the adjustment of the driving current I with respect to the temperature change can be performed over the entire surface of the light emitting region S. Since it can be made uniform, the luminance distribution in the light emitting region S can be adjusted uniformly.

  In the embodiment shown in FIG. 2, the temperature compensation functional layer 14 is formed on the second electrode 13, and the low resistance wiring layer 15 forming a part of the voltage supply path is formed on the temperature compensation functional layer 14. Since it is formed, the wiring resistance of the voltage supply can be lowered by the low resistance wiring layer 15, and a current sufficient for each self-light emitting element 1 to obtain a predetermined light emission luminance can be passed with a relatively low power supply voltage. .

  By arranging the temperature compensation function layer 14 in this way, even when the light compensation characteristics and the light transmission characteristics of the temperature compensation function layer 14 are low, a bottom emission method in which light is extracted as indicated by an arrow from the support substrate 10 side. Display panel can be obtained. That is, the support substrate 10, the planarization film 21, and the first electrode 11 are used as a light-transmitting member, and the second electrode 13 is used as a light-reflecting member. The light can be emitted to the support substrate 10 side.

  FIG. 6 is an explanatory view showing an element structure of a self-luminous display panel according to another embodiment of the present invention (the same members as those of the above-described embodiment are denoted by the same reference numerals). In this embodiment, a top emission type display panel that extracts light from the side opposite to the support substrate 10 is configured.

  Here, as in the embodiment described above, the self-luminous element 1 basically includes the first electrode 11, at least one light emitting functional layer 12 formed on the first electrode, and the light emitting functional layer 12. The light emission luminance can be obtained by a voltage applied between the first electrode 11 and the second electrode 13. More specifically, a TFT 20 as a driving element is formed for each self-luminous element 1 on the support substrate 10, and a planarizing film 21 is formed thereon, with respect to the connection portion 20 </ b> A of the TFT 20. A connection hole 21A is formed. The light emitting region S of the self light emitting element 1 is partitioned by the opening of the insulating film 22, and the light emitting functional layer 12 is patterned in the opening on the first electrode 11.

  In this embodiment, the temperature compensation functional layer 14 described above is formed between the first electrode 11 and the support substrate 10. That is, the temperature compensation functional layer 14 is divided and patterned for each self-luminous element 1 on the planarizing film 21 and is in contact with the connection portion 20A through the connection hole 21A. In addition, the reflective electrode film 16 and the first electrode 11 are laminated on it. Here, when the first electrode 11 can be formed of a light reflective material, the reflective electrode film 16 can be omitted. In order to form a top emission structure, the second electrode 13 needs to be formed of a transparent conductive film (an ultra-thin metal, ITO, IZO, or a laminated film thereof).

  Also in such an embodiment, the temperature compensation function layer 14 is formed in series with the voltage supply path for applying a voltage to the self light emitting element 1 in the self light emitting display panel as in the above-described embodiment. A driving voltage V is applied to the self-light emitting element 1 through the TFT 20 serving as a switching element.

  That is, as shown in FIG. 5, the temperature compensation function layer 14 has a temperature resistance characteristic in which the resistance value Rt is relatively increased with respect to the temperature rise. The relative resistance value Rt of the temperature compensation function layer 14 formed in series with the self-light-emitting element 1 increases, and the drive current I decreases. As a result, even if the light emitting functional layer 12 of the self light emitting element 1 has a temperature emission luminance characteristic in which the luminance increases as the temperature increases, the increase in luminance is offset by the decrease in the driving current I described above. The temperature dependence of the emission luminance can be apparently reduced.

  FIG. 7 is an explanatory view showing an element structure of a self-luminous display panel according to another embodiment of the present invention (the same members as those of the above-described embodiment are denoted by the same reference numerals). In the embodiment shown in FIG. 2 or FIG. 6 described above, the temperature compensation functional layer 14 is formed outside (upper or lower) between the first electrode 11 and the second electrode 13. In the example shown, the temperature compensation functional layer 14 is formed between the first electrode 11 and the second electrode 13. As a result, the same operation as that of the above-described embodiment can be obtained. However, in order to adopt such a structure, the light transmissive property or light reflective property of the temperature compensation functional layer 14 becomes important, and a desired electron injecting property or hole injecting property is required.

  The manufacturing method of the self-luminous display panel according to the embodiment of the present invention will be described. In each of the above-described embodiments, the temperature compensation function layer 14 is provided before or after the film forming process in the self-luminous element 1. At least one layer is laminated in series with the voltage supply path applied between the electrode 11 and the second electrode 13.

  That is, in the embodiment shown in FIG. 2, the TFT 20 is formed on the support substrate 10, and the planarizing film 21 having the connection hole 21A is formed thereon. Then, the first electrode 11 is formed on the planarizing film 21 so as to be in contact with the connection portion 20A through the connection hole 21A. Thereafter, the insulating film 22 is patterned to form an opening of the light emitting region S partitioned by the insulating film 22. Then, a film forming step is performed on the support substrate 10 to form the light emitting functional layer 12 and the second electrode 13 in the opening. In the case of forming a color display panel, layers for each color in the light emitting functional layer 12 are separately applied. After this film forming step, the temperature compensation functional layer 14 is laminated on the second electrode 13, and the low resistance wiring layer 15 is further laminated thereon.

  In the embodiment shown in FIG. 6, the TFT 20 is formed on the support substrate 10, and the planarizing film 21 having the connection hole 21A is formed thereon. Then, the temperature compensation function layer 14 is formed on the planarizing film 21 so as to be in contact with the connection portion 20A through the connection hole 21A. Further, the reflective electrode film 16 and the first electrode 11 are formed and patterned. Thereafter, the insulating film 22 is patterned to form an opening of the light emitting region S partitioned by the insulating film 22. Then, a film forming step is performed on the support substrate 10 to form the light emitting functional layer 12 and the second electrode 13 in the opening.

  Here, the temperature compensation functional layer 14 is formed by using an appropriate coating technique depending on the material to be used. For example, a printing technique such as screen printing or an inkjet method can be adopted.

Below, the specific example in the case of employ | adopting an organic EL element as the self-light-emitting element 1 mentioned above is demonstrated.
First, an organic EL element will be described. Generally, an organic EL element has a structure in which an organic EL functional layer is sandwiched between an anode (anode, hole injection electrode) and a cathode (cathode, electron injection electrode). Yes. By applying a voltage to both electrodes, the holes injected and transported from the anode into the organic EL functional layer and the electrons injected and transported from the cathode into the organic EL functional layer are regenerated in this layer (light emitting layer). Light emission is obtained by bonding. A specific structure and material examples of an organic EL element in which a first electrode 11, a light emitting functional layer 12 composed of an organic EL functional layer, and a second electrode 13 are laminated on a support substrate 10 are as follows.

  In particular, when the bottom emission structure shown in FIG. 2 is adopted, the support substrate 10 is preferably a flat plate or film having transparency, and glass or plastic can be used as the material. When the top emission structure shown in FIG. 6 is adopted, the transparency of the support substrate 10 is not particularly required.

  One of the first and second electrodes 11 and 13 is set as a cathode and the other is set as an anode. In this case, the anode is preferably made of a material having a high work function, such as a metal film such as chromium (Cr), molybdenum (Mo), nickel (Ni), platinum (Pt), or a metal oxide such as ITO or IZO. A transparent conductive film such as a film is used. The cathode is preferably made of a material having a low work function. In particular, alkali metal (Li, Na, K, Rb, Cs), alkaline earth metal (Be, Mg, Ca, Sr, Ba), rare earth A metal having a low work function such as a metal, a compound thereof, or an alloy containing them can be used. When both the first electrode 11 and the second electrode 13 are made of a transparent material, a configuration in which a reflective film is provided on the electrode side opposite to the light emission side can also be adopted.

  Further, the lead electrode drawn from the first electrode 11 or the second electrode 13 is a wiring electrode provided to connect the self-luminous display panel and driving means such as an IC and a driver for driving the self-luminous display panel, Preferably, a low resistance metal material such as Ag, Cr, Al or an alloy thereof is used.

  In general, the first electrode 11 and the extraction electrode are formed by depositing the first electrode 11 and a thin film for the extraction electrode by ITO, IZO or the like by a method such as vapor deposition or sputtering, and forming a pattern by a photolithography method or the like. Made. Regarding the first electrode 11 and the extraction electrode (particularly the extraction electrode that needs to be reduced in resistance), two layers in which a low-resistance metal such as Ag, Ag alloy, Al, or Cr is laminated on the above-described underlayer such as ITO or IZO. A structure having a three-layer structure in which a material having a high oxidation resistance such as Cu, Cr, Ta or the like is further laminated as a protective layer such as Ag can be employed.

  As an organic EL functional layer (light emitting functional layer 12) formed between the first electrode 11 and the second electrode 13, when the first electrode 11 is an anode and the second electrode 13 is a cathode, Is generally a stacked structure of hole transport layer / light emitting layer / electron transport layer (when the first electrode 11 is a cathode and the second electrode 13 is an anode, the stacking order is reversed). The light emitting layer, the hole transport layer, and the electron transport layer may be provided by laminating not only one layer but also a plurality of layers. Both of the hole transport layer and the electron transport layer may be omitted. This layer may be omitted and only the light emitting layer may be used. In addition, as the organic EL functional layer, an organic functional layer such as a hole injection layer, an electron injection layer, a hole barrier layer, or an electron barrier layer can be inserted depending on the application.

  The material of the organic EL functional layer can be appropriately selected according to the use of the organic EL element. Examples are shown below, but are not limited thereto.

  The hole transport layer only needs to have a function of high hole mobility, and any material can be selected and used from conventionally known compounds. Specific examples include porphyrin compounds such as copper phthalocyanine, aromatic tertiary amines such as 4,4′-bis [N- (1-naphthyl) -N-phenylamino] -biphenyl (NPB), 4- (di- Organic materials such as stilbene compounds such as p-tolylamino) -4 ′-[4- (di-p-tolylamino) styryl] stilbenzene, triazole derivatives and styrylamine compounds are used. In addition, a polymer-dispersed material in which a low-molecular organic material for hole transport is dispersed in a polymer such as polycarbonate can also be used. Preferably, a material whose glass transition temperature is higher than the temperature at which the sealing resin is heated and cured is preferable, for example, 4,4′-bis [N- (1-naphthyl) -N-phenylamino] -biphenyl (NPB). It is done.

A known light emitting material can be used for the light emitting layer. Specific examples include aromatic dimethylidin compounds such as 4,4′-bis (2,2′-diphenylvinyl) -biphenyl (DPVBi), 1,4- Styrylbenzene compounds such as bis (2-methylstyryl) benzene, triazole derivatives such as 3- (4-biphenyl) -4-phenyl-5-t-butylphenyl-1,2,4-triazole (TAZ), anthraquinone derivatives , Fluorescent organic materials such as fluorenone derivatives, fluorescent organic metal compounds such as (8-hydroxyquinolinato) aluminum complex (Alq ₃ ), polyparaphenylene vinylene (PPV), polyfluorene, polyvinylcarbazole (PVK) The phosphorescence from triplet excitons such as platinum complexes and iridium complexes can be used for light emission. The organic material (special table 2001-520450) can be used. It may be composed only of the light emitting material as described above, or may contain a hole transport material, an electron transport material, an additive (donor, acceptor, etc.) or a light emitting dopant. These may be dispersed in a polymer material or an inorganic material.

  The electron transport layer only needs to have a function of transmitting electrons injected from the cathode to the light emitting layer, and any material can be selected from conventionally known compounds. Specific examples include organic materials such as nitro-substituted fluorenone derivatives and anthraquinodimethane derivatives, metal complexes of 8-quinolinol derivatives, metal phthalocyanines, and the like.

  The hole transport layer, the light emitting layer, and the electron transport layer are formed by a wet process such as a coating method such as a spin coating method or a dipping method, a printing method such as an ink jet method or a screen printing method, or a vapor deposition method. It can be formed by a dry process such as a method.

  The organic EL element may form a single organic EL element or may have a desired pattern structure and constitute a plurality of pixels. In the latter case, the display method may be single-color light emission or multi-color light emission of two or more colors, and in particular, in order to realize a multi-color light emission organic EL panel, three types of light emitting function layers corresponding to RGB are provided. A method of forming a light emitting functional layer of two or more colors including a forming method (coloring method), a method of combining a color conversion layer made of a color filter or a fluorescent material with a single color light emitting functional layer such as white or blue (CF method, CCM method), a method that realizes multiple light emission by irradiating electromagnetic waves to the light emitting area of the monochromatic light emitting functional layer (photo bleaching method), and low molecular organic materials with different light emitting colors are formed on different films in advance. For example, a laser transfer method in which the image is transferred onto one substrate by thermal transfer using a laser can be used.

  Since each embodiment of the present invention is configured as described above, no additional components, circuits, or the like are required in the drive circuit system in order to eliminate the temperature dependence of the light emission luminance characteristics, and the occupied space can be expanded or the entire apparatus Thus, a temperature-compensated self-luminous display panel that does not increase the cost can be obtained.

It is explanatory drawing of a prior art. It is explanatory drawing explaining the self-luminous display panel which concerns on one Embodiment of this invention. It is explanatory drawing explaining the self-luminous display panel which concerns on one Embodiment of this invention. It is explanatory drawing (equivalent circuit diagram) explaining the effect | action of the self-light-emitting display panel which concerns on one Embodiment of this invention. It is explanatory drawing (temperature resistance characteristic figure) explaining the effect | action of the self-luminous display panel which concerns on one Embodiment of this invention. It is explanatory drawing explaining the self-luminous display panel which concerns on other embodiment of this invention. It is explanatory drawing explaining the self-luminous display panel which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Self-light emitting element 10 Support substrate 11 1st electrode 12 Light emission functional layer 13 2nd electrode 14 Temperature compensation functional layer 15 Low resistance wiring layer 16 Reflective electrode film 20 TFT
20A connection portion 21 planarization film 21A connection hole 22 insulating film S light emitting region

Claims (6)

A self-luminous element comprising a first electrode, at least one light emitting functional layer formed on the first electrode, and a second electrode formed on the light emitting functional layer is formed on a support substrate. In the self-luminous display panel that is arranged and obtains the luminance of the self-luminous element by the voltage applied between the first and second electrodes,
A temperature compensation functional layer made of a conductive material having a temperature resistance characteristic having the same tendency as the thermoluminescent luminance characteristic of the light emitting functional layer is connected in series with the voltage supply path applied between the first and second electrodes. A self-luminous display panel, wherein at least one layer is laminated.   The self-luminous display panel according to claim 1, wherein an area of the temperature compensation functional layer is larger than a light-emitting region of the self-luminous element.   2. The temperature compensation function layer is formed on the second electrode, and a low resistance wiring layer forming a part of the voltage supply path is formed on the temperature compensation function layer. Or the self-luminous display panel described in 2.   The self-luminous display panel according to claim 1, wherein the temperature compensation functional layer is formed between the first electrode and the support substrate.   The self-luminous display panel according to claim 1, wherein the light emitting functional layer includes at least one organic EL functional layer. A self-luminous element comprising a first electrode, at least one light emitting functional layer formed on the first electrode, and a second electrode formed on the light emitting functional layer is formed on a support substrate. In the method of manufacturing a self-luminous display panel that is arranged and obtains the light emission luminance of the self-luminous element by a voltage applied between the first and second electrodes,
Before or after the film forming step in the self-luminous element,
A temperature compensation functional layer made of a conductive material having a temperature resistance characteristic having the same tendency as the thermoluminescent luminance characteristic of the light emitting functional layer is connected in series with the voltage supply path applied between the first and second electrodes. A method of manufacturing a self-luminous display panel, wherein at least one layer is laminated.

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