JP2013225409A - Light-emitting panel manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology which reduces positional variation in aging levels.SOLUTION: A manufacturing method for a light-emitting panel having a luminous surface is disclosed. The manufacturing method includes: a first step in which luminance distribution in the luminous surface which is lighted overall is measured; a second step in which the luminous surface is divided into a plurality of regions, and an aging temperature is set for each of the plurality of regions according to the luminance distribution; and a third step in which the light-emitting panel is turned on to emit light and the temperature of the luminous surface is adjusted. In the third step, the plurality of regions each have their temperatures adjusted to the aging temperatures set in the second step.

Description

  The present invention relates to a method for manufacturing a light-emitting panel.

  Various display devices including a light emitting panel that emits image light have been developed. The light-emitting panel emits light using a light-emitting element and displays an image. It is known that the light emission efficiency of a light emitting element such as an organic EL (electroluminescence) element depends on temperature. Patent Document 1 discloses a technique for controlling the light emission efficiency by utilizing the temperature dependence of a light emitting element.

  It is also known that the luminous efficiency of a light emitting element changes with time. Patent Document 2 discloses an aging technique for reducing a change in luminous efficiency over time.

  The aging technique disclosed in Patent Document 2 uses the temperature of the light emitting panel to control the amount of heating for the light emitting panel. As a result, the light emitting panel is subjected to an aging process under an appropriate temperature environment.

JP 2006-251193 A Japanese Patent Laid-Open No. 1-189889

  There is also known a technique in which a light-emitting element is turned on to age the light-emitting panel. In this case, positional temperature variation occurs in the display surface for displaying the video. The positional temperature variation results in the aging level variation. In other words, an excessively aged area and an insufficiently aged area may occur in the display surface.

  In accordance with the exemplary embodiments disclosed below, techniques are provided for mitigating positional variations in aging levels.

  Exemplary embodiments disclosed below relate to a method of manufacturing a light emitting panel having a light emitting surface. The manufacturing method includes a first step of measuring a luminance distribution in the light emitting surface that is lighted on the entire surface, and divides the light emitting surface into a plurality of regions, and sets an aging temperature in each of the plurality of regions according to the luminance distribution. A second step of setting, and a third step of causing the light-emitting panel to emit light and adjusting the temperature of the light-emitting surface. In the third step, each of the plurality of regions includes the second step. It is adjusted to the aging temperature set in (1).

  The technique according to the exemplary embodiment disclosed below causes little performance degradation due to heat generation during the aging process.

It is a schematic top view of a light emission panel. FIG. 2 is a schematic partial cross-sectional view of a light emitting unit of the light emitting panel shown in FIG. 1. It is an example isotherm diagram showing the temperature distribution in the light emission part at the time of an aging process. FIG. 4 is an exemplary isoluminance diagram showing the luminance distribution of the light emitting layer of the light emitting unit having the temperature characteristics shown in FIG. 3. FIG. 2 is a schematic cross-sectional view of the light emitting panel shown in FIG. 1. FIG. 2 is a schematic cross-sectional view of the light emitting panel shown in FIG. 1. It is a schematic isoluminance diagram showing the luminance data which the luminance meter output to the computer. It is the schematic of the brightness | luminance data after an averaging process. It is the schematic of the temperature data value which the computer allocated to the division area. It is a schematic perspective view of the temperature adjustment apparatus used for temperature adjustment during an aging process. FIG. 11 is a schematic cross-sectional view of a light emitting panel whose temperature is adjusted by the temperature adjusting device shown in FIG. 10. It is a schematic flowchart of the manufacturing method of the light emission panel according to 1st Embodiment. It is a schematic flowchart of the manufacturing method of the light emission panel according to 2nd Embodiment. It is the schematic of the division area reset in step S280 shown by FIG. It is the schematic of the temperature data value which the computer allocated to the division area in step S290 shown by FIG.

  An exemplary light emitting panel manufacturing method will be described with reference to the drawings. In the embodiment described below, the same reference numerals are given to the same components. For the sake of clarification of explanation, duplicate explanation is omitted as necessary. The structure, arrangement, or shape shown in the drawings and the description related to the drawings are intended to facilitate understanding of the principle of the manufacturing method of the light-emitting panel. The principle of the manufacturing method of the light emitting panel is not limited to these.

<Problems related to aging treatment>
FIG. 1 is a schematic plan view of the light emitting panel 500. A light-emitting panel 500 will be described with reference to FIG.

  The light emitting panel 500 is, for example, a substantially rectangular light emitting unit 510 for displaying an image, a circuit board 520 arranged along four sides of the light emitting unit 510, and the light emitting unit 510 and the circuit board 520 are electrically connected. A flexible substrate 530 for performing the operation. The circuit board 520 generates a drive signal for driving the light emitting unit 510. The drive signal is input to the light emitting unit 510 via the flexible substrate 530. The light emitting unit 510 emits light according to the drive signal and displays an image.

  FIG. 2 is a schematic partial cross-sectional view of the light emitting unit 510. The light emitting unit 510 is described with reference to FIGS. 1 and 2.

  The light emitting unit 510 includes a first substrate 511 that defines a light emitting surface 551 that emits light, and a second substrate 512 that faces the first substrate 511. The second substrate 512 defines a back surface 552 opposite to the light emitting surface 551. Various elements (described later) for displaying an image are formed or disposed between the first substrate 511 and the second substrate 512.

  The light emitting unit 510 includes a TFT substrate 513 formed on the second substrate 512, a planarization layer 514 for planarizing the TFT substrate 513, and a bank unit 515 formed on the planarization layer 514. . The bank unit 515 includes display pixels that emit light in a red hue (indicated as “display pixels (red)” in FIG. 2), display pixels that emit light in a green hue (in FIG. 2, “display pixels (green) ) ”And a contour of a display pixel that emits light in a blue hue (denoted as“ display pixel (blue) ”in FIG. 2).

  The light emitting unit 510 further includes a reflective anode 516 disposed corresponding to each display pixel, and a transparent cathode 517 extending in a direction substantially orthogonal to the reflective anode 516. The reflective anode 516 is formed on the planarization layer 514 between the bank portions 515. The transparent cathode 517 is formed between the first substrate 511 and the bank unit 515. When a drive signal is output from the circuit board 520, a voltage is applied between the reflective anode 516 and the transparent cathode 517.

  The light emitting unit 510 further includes a hole injection layer 518 stacked on the reflective anode 516 and a hole transport layer 519 stacked on the hole injection layer 518. The light emitting unit 510 emits light in a blue hue with a light emitting layer 540R formed corresponding to a display pixel that emits light in a red hue, a light emitting layer 540G formed in correspondence with a display pixel that emits light in a green hue. And a light emitting layer 540B formed corresponding to the display pixel to be displayed. The light emitting layers 540R, 540G, and 540B are formed on the hole transport layer 519, respectively.

  When a voltage is applied between the reflective anode 516 and the transparent cathode 517, a current flows in the light emitting layers 540R, 540G, and 540B. The light emitting layers 540R, 540G, and 540B are formed of an organic EL element that emits light according to the flow of current. The light emitting layer 540R emits light with a red hue according to the flow of current. The light emitting layer 540G emits light with a green hue in accordance with the flow of current. The light emitting layer 540B emits light in a blue hue according to the flow of current. In the present embodiment, the light emitting layers 540R, 540G, and 540B are exemplified as a plurality of light emitting elements that emit light with different hues. The light emitting layer 540B is exemplified as the first light emitting element. The light emitting layer 540R or the light emitting layer 540G is exemplified as the second light emitting element.

  An organic EL element that emits light in a blue hue generally has lower luminous efficiency (that is, a lower luminance with respect to an applied voltage) than an organic EL element that emits light in a red or green hue. Therefore, in the present embodiment, the light emitting layer 540B has lower light emission efficiency than the other light emitting layers 540R and 540G.

  The light emitting unit 510 includes an electron transport layer 541 stacked on the light emitting layers 540R, 540G, and 540B, and an electron injection layer 542 formed between the electron transport layer 541 and the transparent cathode 517. Note that the detailed structure of the light emitting unit 510 described with reference to FIG. 2 does not limit the principle of the present embodiment. The principle of the present embodiment is also preferably applied to other light emitting panels to which aging processing is applied.

  FIG. 3 is an exemplary isotherm representing the temperature distribution in the light emitting unit 510 during the aging process. The temperature distribution in the light emitting unit 510 during the aging process will be described with reference to FIGS.

  During the aging process, the light emitting unit 510 is turned on entirely. That is, the light emitting layers 540R, 540G, and 540B emit light. The thickness of the light emitting layers 540R, 540G, and 540B and the actual voltage applied to the light emitting layers 540R, 540G, and 540B are not necessarily uniform in terms of position. As a result, the amount of heat generated by light emission of the light emitting layers 540R, 540G, and 540B varies in position within the light emitting unit 510. As a result, a non-uniform temperature distribution is generated in the light emitting section 510 as shown in the isotherm diagram shown in FIG. In FIG. 3, the upper right region of the light emitting unit 510 has a high temperature, while the lower left region has a low temperature. Therefore, the isotherm diagram of FIG. 3 represents a temperature gradient that increases from the lower left region toward the upper right region.

  In order to shorten the period of the aging process, a heating device for heating the light emitting unit 510 may be used. If the heating device heats the light emitting unit 510, the lower left region may be appropriately aged, while the upper right region may be excessively aged. Alternatively, the upper right region may be properly aged while the lower left region may be underaged. Based on the knowledge described below, the present inventor has devised a technique for eliminating the aging level variation caused by the uneven temperature distribution caused by the entire lighting.

<Findings discovered by the inventor>
The present inventor has found that there is a high correlation between the luminance distribution of the light emitting layer having low luminous efficiency and the temperature distribution during aging.

  FIG. 4 is an exemplary isoluminance diagram showing the luminance distribution of the light emitting layer 540B of the light emitting unit 510 having the temperature characteristics shown in FIG. The correlation between the luminance distribution of the light emitting layer 540B and the temperature distribution in the light emitting portion 510 is described with reference to FIGS.

  The inventors turned on only the light emitting layer 540B of the light emitting unit 510 and measured the luminance distribution. As a result, the isoluminance distribution diagram shown in FIG. 4 was obtained. From the isoluminance diagram of FIG. 4, it can be seen that the upper right region of the light emitting unit 510 emits light with high luminance, while the lower left region emits light with low luminance. The isoluminance diagram of FIG. 4 represents a luminance gradient that increases from the lower left region toward the upper right region.

  Comparing FIG. 3 and FIG. 4, it can be seen that the temperature of the region emitting light with low brightness tends to be low. Moreover, it turns out that the temperature of the area | region which light-emits with high brightness | luminance tends to become high.

  The inventor has devised the following various embodiments using the above-described findings.

<First Embodiment>
FIG. 5 is a schematic cross-sectional view of the light emitting panel 500. The aging process for the light-emitting panel 500 will be described with reference to FIGS.

  A support base 100 is prepared for aging processing on the light emitting panel 500. The light emitting panel 500 is subjected to an aging process on the support base 100.

  The support base 100 includes a pedestal part 110, a leg part 120 standing upright from the pedestal part 110, and a support frame body 130 constructed on the leg part 120. The support frame 130 includes an inner frame 131 that supports the periphery of the light emitting unit 510 and an outer frame 132 that surrounds the inner frame 131. The circuit board 520 is supported by the outer frame 132.

  The outer frame 132 is formed using a highly thermally conductive material such as a metal or a carbon graphite sheet. The circuit board 520 generates heat during the aging process using the light emission of the light emitting layers 540R, 540G, and 540B. Heat from the circuit board 520 is efficiently transferred to the outer frame 132. Since the outer frame 132 has a high thermal conductivity, the heat transferred from the circuit board 520 is conducted to the outer frame 132 as a whole. As a result, the outer frame 132 can dissipate heat efficiently.

  The inner frame 131 is formed of a material having excellent heat insulation properties such as glass fiber, cement, and mica. Therefore, the inner frame 131 blocks most of the heat flow between the light emitting unit 510 and the outer frame 132. Therefore, the light emitting unit 510 is not easily affected by the heat transmitted to the outer frame 132.

  FIG. 6 is a schematic cross-sectional view of the light emitting panel 500. The aging process for the light emitting panel 500 will be further described with reference to FIGS.

  A luminance meter 200 for measuring the luminance distribution of the light emitting panel 500 on the support base 100 and a computer 300 for processing the luminance data acquired by the luminance meter 200 are prepared. The circuit board 520 outputs a drive signal for causing the light emitting layer 540 </ b> B to emit light to the light emitting unit 510 via the flexible board 530. At this time, the light emitting layers 540R and 540G do not emit light.

  As a result of the output of the drive signal from the circuit board 520, the light-emitting panel 500 is lit entirely with the blue emission color. The drive signal generated by the circuit board 520 defines a uniform luminance for each light emitting layer 540B throughout the light emitting unit 510, but the actual luminance measured by the luminance meter 200 varies in position. To do.

  FIG. 7 is a schematic isoluminance diagram showing the luminance data output from the luminance meter 200 to the computer 300. Processing for luminance data will be described with reference to FIGS. 6 and 7.

  As described with reference to FIG. 6, the luminance meter 200 acquires luminance data related to the luminance distribution of the light-emitting panel 500 that emits light in a blue emission color. Luminance data is output from the luminance meter 200 to the computer 300.

  FIG. 7 shows the luminance distribution in the light emitting region ER of the light emitting unit 510. The computer 300 divides the light emitting area ER into a plurality of divided areas DR1 to DR16. The computer 300 processes the luminance data for the divided regions DR1 to DR16. For example, the computer 300 may perform an averaging process on the luminance data corresponding to each of the divided regions DR1 to DR16. If the division with respect to the light emitting region ER becomes fine, the luminance distribution in the light emitting region ER is reproduced with high accuracy. As a result, the aging level is adjusted with high accuracy. In addition, the fineness of the division of the light emitting area may be determined according to the performance of the temperature adjusting device (described later).

  FIG. 8 is a schematic diagram of luminance data after the averaging process. Luminance data is described with reference to FIGS.

  The computer 300 performs an averaging process on the luminance data corresponding to each of the divided regions DR1 to DR16. The calculated average luminances B1 to B16 are shown in the divided regions DR1 to DR16 shown in FIG. The computer 300 individually assigns temperature data values to the divided regions DR1 to DR16 based on the average luminances B1 to B16.

  FIG. 9 is a schematic diagram of temperature data values assigned by the computer 300 to the divided regions DR1 to DR16. The temperature data values are described with reference to FIGS. 4 and 6 to 9.

  The computer 300 individually assigns temperature data values to the divided regions DR1 to DR16 based on the average luminances B1 to B16. Temperature data values T1 to T16 representing temperatures are assigned to the divided regions DR1 to DR16, respectively.

  The isoluminance diagram shown in FIG. 7 is the same as the isoluminance diagram described with reference to FIG. Therefore, the average luminance B4 calculated for the divided region DR4 shown in FIG. 8 is larger than the average luminance B13 calculated for the divided region DR13. The computer 300 sets a small temperature data value for the high average luminance. Therefore, the temperature data value T4 assigned to the divided region DR4 by the computer 300 is smaller than the temperature data value T13 assigned to the divided region DR13. The computer 300 may store in advance data (for example, a lookup table) related to the correspondence between the average luminance and the temperature data value. Alternatively, the computer 300 may store in advance an arithmetic expression for outputting a temperature data value according to the average luminance. In the present embodiment, the divided region DR4 is exemplified as the second region. The divided region DR13 is exemplified as the first region.

  In the present embodiment, the computer 300 performs an averaging process on the luminance data in order to set the temperature data values T1 to T16 for the divided regions DR1 to DR16. Alternatively, the temperature data value may be set based on other arithmetic processing. For example, data related to the luminance gradient in the divided area may be used for calculation for setting the temperature data value. The calculation method for setting the temperature data value does not limit the principle of this embodiment at all.

  FIG. 10 is a schematic perspective view of a temperature adjustment device 400 used for temperature adjustment during the aging process. The temperature adjustment device 400 is described with reference to FIGS. 1, 7, and 10.

  The temperature adjustment device 400 includes a plurality of cell elements 410. The cell elements 410 are arranged in a matrix and form a substantially flat upper surface 420. The upper surface 420 has an area substantially equal to the light emitting region of the light emitting unit 510.

  The cell element 410 is formed using a Peltier element (not shown). The temperature adjustment device 400 is formed so that the polarity of the current supplied to each cell element 410 can be individually changed. Therefore, the upper surface 420 is locally heated or cooled. In the present embodiment, the cell element 410 is exemplified as a temperature adjustment cell. The upper surface 420 formed by the cell element 410 is exemplified as the temperature adjustment surface. The Peltier element used for the cell element 410 is exemplified as a thermoelectric conversion element.

  Some of the plurality of cell elements 410 include a temperature sensor (not shown) for measuring the temperature of an object in contact with the upper surface 420 in addition to the Peltier element. In FIG. 10, the cell element including the temperature sensor is described using the reference numeral “411”. The arrangement density of the cell elements 411 may be determined according to the fineness of the section of the light emitting region ER described with reference to FIG. In the present embodiment, the cell element 411 is exemplified as a temperature detection cell.

  In the present embodiment, some of the plurality of cell elements 410 are cell elements 411 with temperature sensors. Alternatively, all the cell elements 410 may be cell elements 411 with temperature sensors. The high arrangement density of the cell elements 411 results in fine temperature adjustment.

  FIG. 11 is a schematic cross-sectional view of the light emitting panel 500 whose temperature is adjusted by the temperature adjustment device 400. The temperature adjustment process for the light-emitting panel 500 that uses the aging process will be described with reference to FIGS. 9 to 11.

  In order to adjust the temperature of the light emitting panel 500, a temperature control device 400 and a control panel 430 for controlling the polarity and magnitude of the current supplied to each cell element 410 of the temperature control device 400 are prepared. The control panel 430 is installed on the pedestal part 110 of the support base 100. The temperature adjustment device 400 is installed on the control panel 430. At this time, the upper surface 420 of the temperature adjustment device 400 contacts the back surface 552 of the light emitting unit 510. In the present embodiment, the temperature adjustment device 400 is arranged on the rear surface 552 side of the light emitting surface. However, it is obvious that the temperature distribution in the panel is almost the same with a panel having the same configuration. When it is not necessary to monitor the luminance during aging, the temperature adjusting device 400 may be disposed on the light emitting surface 551 side.

  The control panel 430 is electrically connected to the computer 300. The computer 300 outputs the temperature data value described with reference to FIG. 9 to the control panel 430. The control panel 430 adjusts the polarity and magnitude of the current supplied to each cell element 410 according to the temperature data value.

  A cell element 411 with a temperature sensor detects the local temperature of the light emitting unit 510. A detection signal corresponding to the temperature detected by the cell element 411 is output to the control panel 430. The control panel 430 adjusts the polarity and magnitude of the current supplied to each cell element 410 according to the detection signal. Thus, feedback control between the control panel 430 and the temperature adjustment device 400 is established. Under feedback control between the control panel 430 and the temperature adjusting device 400, the temperature of the light emitting surface 551 of the light emitting unit 510 is appropriately adjusted.

  The cell element 410 can heat or cool the light emitting unit 510 according to the polarity of the supplied current. Therefore, the temperature adjustment of the light emitting unit 510 is performed with high accuracy. Since the temperature of each cell element 410 is individually adjusted, the temperatures of the divided regions DR1 to DR16 are set to different temperatures. As a result, the temperature adjustment device 400 can adjust the temperature so that the light emitting surface 551 of the light emitting unit 510 has the temperature data values T1 to T16 assigned to the divided regions DR1 to DR16 by the computer 300. . In the present embodiment, the temperature adjustment device 400 can heat and cool the light emitting unit 510. Alternatively, a heater that only heats the light emitting unit may be used as the temperature adjustment device. Alternatively, a cooling structure that only cools the light emitting unit may be used as the temperature adjustment device.

  FIG. 12 is a schematic flowchart of a method for manufacturing the light emitting panel 500. A method for manufacturing the light-emitting panel 500 will be described with reference to FIGS. 2 and 5 to 12.

(Step S110)
In step S110, the light emitting panel 500 is installed on the support base 100 as described with reference to FIG. After the light emitting panel 500 is installed on the support base 100, step S120 is performed.

(Step S120)
In step S120, as described with reference to FIG. 6, the light emitting panel 500 is turned on entirely using only the light emitting layer 540R. During this time, the luminance meter 200 measures the luminance distribution that appears on the light emitting unit 510. The luminance meter 200 outputs data relating to the luminance distribution to the computer 300. After the output of data from the luminance meter 200 to the computer 300, step S130 is executed. In the present embodiment, step S120 is exemplified as the first step.

(Step S130)
In step S130, as described with reference to FIG. 7, the computer 300 divides the light emitting area that appears on the light emitting surface 551 into divided areas DR1 to DR16. Thereafter, as described with reference to FIGS. 8 and 9, the computer 300 sets the temperature data values T1 to T16 for the divided regions DR1 to DR16, respectively. After setting the temperature data values T1 to T16, step S140 is executed. In the present embodiment, step S130 is exemplified as the second step. The divided areas DR1 to DR16 are exemplified as a plurality of areas. The temperature data values T1 to T16 are exemplified as the aging temperature.

(Step S140)
In step S <b> 140, the circuit board 520 outputs a drive signal to the light emitting unit 510. As a result, the light emitting layers 540R, 540G, and 540B of the light emitting unit 510 emit light. Since the light emitting panel 500 is turned on entirely using the light emitting layers 540R, 540G, and 540B, the aging process proceeds over the entire light emitting region ER.

  As described with reference to FIG. 11, the temperature adjustment device 400 is brought into contact with the light emitting unit 510. The temperature of the light emitting panel 500 is adjusted by the temperature adjustment device 400 so that the light emitting surface 551 of the light emitting unit 510 has the temperature set in step S130. During step S140, the luminance meter 200 measures the luminance of the light emitting surface 551. Data relating to the measured luminance is output from the luminance meter 200 to the computer 300. In the present embodiment, step S140 is exemplified as the third step. When a predetermined period has elapsed from the start of step S140, step S150 is executed.

(Step S150)
In step S150, the computer 300 determines whether or not the luminance of the light emitting surface 551 has reached the target value. If the luminance on the light emitting surface 551 has not reached the target value, step S140 is executed again. If the luminance on the light emitting surface 551 has reached the target value, step S150 ends.

Second Embodiment
FIG. 13 is a schematic flowchart of a method for manufacturing the light emitting panel 500. A method for manufacturing the light-emitting panel 500 will be described with reference to FIGS. 2, 5 to 11, and 13.

(Step S210)
In step S210, the light emitting panel 500 is installed on the support base 100 as described with reference to FIG. After the light emitting panel 500 is installed on the support base 100, step S220 is executed.

(Step S220)
In step S220, as described with reference to FIG. 6, the light emitting panel 500 is turned on entirely using only the light emitting layer 540R. During this time, the luminance meter 200 measures the luminance distribution that appears on the light emitting unit 510. The luminance meter 200 outputs data relating to the luminance distribution to the computer 300. After the output of data from the luminance meter 200 to the computer 300, step S230 is executed. In the present embodiment, step S220 is exemplified as the first step.

(Step S230)
In step S230, as described with reference to FIG. 7, the computer 300 divides the light emitting area ER that appears on the light emitting surface 551 into divided areas DR1 to DR16. Thereafter, as described with reference to FIGS. 8 and 9, the computer 300 sets the temperature data values T1 to T16 for the divided regions DR1 to DR16, respectively. After setting the temperature data values T1 to T16, step S240 is executed. In the present embodiment, step S230 is exemplified as the second step. The divided areas DR1 to DR16 are exemplified as a plurality of areas. The temperature data values T1 to T16 are exemplified as the aging temperature.

(Step S240)
In step S240, the circuit board 520 outputs a drive signal to the light emitting unit 510. As a result, the light emitting layers 540R, 540G, and 540B of the light emitting unit 510 emit light. Since the light emitting panel 500 is turned on entirely using the light emitting layers 540R, 540G, and 540B, the aging process proceeds over the entire light emitting region ER.

  As described with reference to FIG. 11, the temperature adjustment device 400 is brought into contact with the light emitting unit 510. The temperature of the light emitting panel 500 is adjusted by the temperature adjustment device 400 so that the light emitting surface 551 of the light emitting unit 510 has the temperature set in step S230. During step S240, the luminance meter 200 measures the luminance of the light emitting surface 551. Data relating to the measured luminance is output from the luminance meter 200 to the computer 300. In the present embodiment, step S240 is exemplified as the third step. The measurement of the luminance with respect to the light emitting surface 551 executed during step S240 is exemplified as a step of monitoring the luminance distribution. When a predetermined period has elapsed from the start of step S240, step S250 is executed.

(Step S250)
In step S250, the computer 300 determines whether or not the average luminance of the light emitting surface 551 has reached the target value. If the average luminance on the light emitting surface 551 has not reached the target value, step S240 is executed again. If the average luminance on the light emitting surface 551 has reached the target value, step S260 is executed.

(Step S260)
In step S260, the computer 300 calculates a difference value between the maximum luminance and the minimum luminance among the luminance data measured by the luminance meter 200. In the present embodiment, the difference value is exemplified as the width of the luminance distribution.

  The computer 300 stores in advance a threshold value determined for the difference value. The computer 300 compares the difference value with the threshold value. If the difference value is less than or equal to the threshold value, the light emission of the light emitting panel 500 and the temperature adjustment by the temperature adjustment device 400 are stopped. If the difference value exceeds the threshold value, step S270 is executed.

(Step S270)
In step S270, as described with reference to FIG. 6, the light emitting panel 500 is turned on entirely using only the light emitting layer 540R. During this time, the luminance meter 200 measures the luminance distribution that appears on the light emitting unit 510. The luminance meter 200 outputs data relating to the luminance distribution to the computer 300. After the output of data from the luminance meter 200 to the computer 300, step S280 is executed.

(Step S280)
In step S280, the computer 300 newly partitions the light emitting area ER that appears on the light emitting surface 551 into a plurality of divided areas. The division of the new divided area will be described later. Step S290 is executed after setting a new divided area.

(Step S290)
In step S290, the computer 300 sets a temperature data value for each of the newly set divided areas. After setting the temperature data value, step S240 is executed again. In step S240 after step S290, the temperature of the light emitting panel 500 is adjusted according to the newly set temperature data value. In the present embodiment, step S280 and step S290 are exemplified as the fourth step. Step S240 executed after step S290 is exemplified as the fifth step.

  FIG. 14 is a schematic diagram of the divided areas DS1 to DS4 reset in step S280. Step S280 will be described with reference to FIG. 6, FIG. 8, FIG. 13, and FIG.

  The positional variation of the luminance in the light emitting region ER is alleviated by the aging process of step S240 executed before step S270. Therefore, as shown in FIGS. 8 and 14, the division for the light emitting region ER in step S280 may be coarser than the division for the previous light emitting region ER.

  In step S280, the computer 300 may perform an averaging process on the luminance data corresponding to each of the divided regions DS1 to DS4. The calculated average luminances BS1 to BS4 are shown in the divided areas DS1 to DS4 shown in FIG. The computer 300 individually assigns temperature data values to the divided areas DS1 to DS4 based on the average luminances BS1 to BS4.

  FIG. 15 is a schematic diagram of temperature data values assigned to the divided areas DS1 to DS4 by the computer 300 in step S290. Step S290 will be described with reference to FIG. 6 and FIGS.

  The computer 300 individually assigns temperature data values to the divided areas DS1 to DS4 based on the average luminances BS1 to BS4. Temperature data values TS1 to TS4 representing temperatures are assigned to the divided areas DS1 to DS4, respectively. The method for setting the temperature data values TS1 to TS4 based on the average luminances BS1 to BS4 is the same as the method described in relation to step S230.

  In the present embodiment, the computer 300 performs an averaging process on the luminance data in order to set the temperature data values TS1 to TS4 for the divided regions DS1 to DS4. Alternatively, the temperature data value may be set based on other arithmetic processing. For example, data related to the luminance gradient in the divided area may be used for calculation for setting the temperature data value. The calculation method for setting the temperature data value does not limit the principle of this embodiment at all.

  The manufacturing method of the light emission panel which concerns on embodiment mentioned above is mainly provided with the following structures.

  The light emitting panel manufactured according to the manufacturing method according to one aspect of the embodiment described above has a light emitting surface. The manufacturing method includes a first step of measuring a luminance distribution in the light emitting surface that is lighted on the entire surface, and divides the light emitting surface into a plurality of regions, and sets an aging temperature in each of the plurality of regions according to the luminance distribution. A second step of setting, and a third step of causing the light-emitting panel to emit light and adjusting the temperature of the light-emitting surface. In the third step, each of the plurality of regions includes the second step. The temperature is adjusted to the aging temperature set in step 1.

  According to the above configuration, in the first step, the luminance distribution in the light-emitting surface that is turned on is measured. In the second step, the light emitting surface is partitioned into a plurality of regions. An aging temperature is set for each of the plurality of regions according to the luminance distribution. In the third step, the light emitting panel emits light. Further, the temperature of the light emitting surface is adjusted. Since each of the plurality of regions is adjusted to the aging temperature set in the second step, the positional variation of the aging level is alleviated.

  In the above configuration, the plurality of regions may include a first region and a second region in which brightness higher than that of the first region is measured in the first step. The aging temperature set for the first region in the second step may be higher than the aging temperature set for the second region.

  According to the said structure, in a 1st process, the brightness | luminance higher than a 1st area | region is measured with respect to a 2nd area | region. Since the aging temperature set for the first region in the second step is higher than the aging temperature set for the second region, there is a difference in the aging level between the first region and the second region. Alleviated.

  In the above configuration, the light-emitting panel may include a plurality of light-emitting elements that emit light with different hues. The plurality of light emitting elements include: a first light emitting element that emits light in a first hue; a second light emitting element that emits light in a second hue different from the first hue with higher luminous efficiency than the first light emitting element; , May be included. In the first step, the entire light emitting surface may be lit using the first light emitting element.

  According to the above configuration, the light-emitting panel includes a plurality of light-emitting elements that emit light with different hues. The plurality of light emitting elements include a first light emitting element that emits light with a first hue and a second light emitting element that emits light with a second hue different from the first hue. In the first step, the entire light emitting surface is turned on using the first light emitting element. Since the first light emitting element has lower luminous efficiency than the second light emitting element, the luminance distribution measured in the first step has a high correlation with the temperature distribution on the light emitting surface in the first step. Since each of the plurality of regions is adjusted to the aging temperature set in the second step, the positional variation of the aging level is alleviated.

  In the above configuration, the first light emitting element may emit light with the lowest light emitting efficiency among the plurality of light emitting elements.

  According to the above configuration, since the first light emitting element emits light with the lowest light emitting efficiency among the plurality of light emitting elements, the luminance distribution measured in the first step is higher than the temperature distribution of the light emitting surface in the first step. It will have a correlation. Since each of the plurality of regions is adjusted to the aging temperature set in the second step, the positional variation of the aging level is alleviated.

  In the above configuration, the first light emitting element may be an organic EL element that emits light in a blue hue.

  According to the above configuration, the first light emitting element is an organic EL element that emits light in a blue hue, and thus emits light with the lowest light emission efficiency among the plurality of light emitting elements. Therefore, the luminance distribution measured in the first step has a high correlation with the temperature distribution of the light emitting surface in the first step. Since each of the plurality of regions is adjusted to the aging temperature set in the second step, the positional variation of the aging level is alleviated.

  In the above configuration, the third step includes a step of monitoring the luminance distribution in the light emitting surface, and a step of comparing the width of the monitored luminance distribution with a threshold value determined for the width of the luminance distribution. And if the width of the luminance distribution is less than or equal to the threshold value, stopping light emission of the light-emitting panel and temperature adjustment for the light-emitting panel.

  According to the above configuration, the luminance distribution in the light emitting surface is monitored in the third step. The width of the monitored luminance distribution is compared with the threshold value. If the width of the luminance distribution is equal to or less than the threshold value, the light emission of the light emitting panel and the temperature adjustment for the light emitting panel are stopped. Therefore, the light emitting panel is not exposed to excessive aging treatment.

  In the above configuration, the manufacturing method includes: a fourth step of resetting the aging temperature if the width of the luminance distribution exceeds the threshold; and the aging temperature reset in the fourth step, And a fifth step of adjusting the temperature of the light emitting surface.

  According to the above configuration, the fourth step is executed if the width of the luminance distribution exceeds the threshold value. In the fourth step, the aging temperature is reset. Since the temperature of the light emitting surface is adjusted under the reset aging temperature, the positional variation in the aging level is appropriately mitigated.

  In the above-described configuration, the third step may include a step of bringing a temperature adjustment device having a temperature adjustment surface capable of adjusting each of the plurality of regions to different temperatures into contact with the light emitting panel.

  According to the above configuration, in the third step, the temperature adjustment device having a temperature adjustment surface capable of adjusting each of the plurality of regions to different temperatures is brought into contact with the light emitting panel, so that the temperature of the light emitting surface is appropriately adjusted. The

  In the configuration described above, the third step may include a step of heating the plurality of regions by bringing the temperature adjustment surface into contact with the light emitting panel.

  According to the above configuration, in the third step, the temperature adjustment surface in contact with the light emitting panel heats the plurality of regions, so that the temperature of the light emitting surface is appropriately adjusted.

  In the above configuration, the third step may include a step of bringing the temperature adjustment surface into contact with the light emitting panel and cooling the plurality of regions.

  According to the above configuration, in the third step, the temperature adjustment surface in contact with the light emitting panel cools the plurality of regions, and thus the temperature of the light emitting surface is appropriately adjusted.

  In the above configuration, the temperature adjustment surface may be formed by a plurality of temperature adjustment cells arranged in a matrix. The temperature adjustment cell may include a thermoelectric conversion element. The third step may include a step of adjusting the temperature of the light emitting surface using the thermoelectric conversion element.

  According to the above configuration, the temperature adjustment surface is formed by a plurality of temperature adjustment cells arranged in a matrix. The temperature adjustment cell includes a thermoelectric conversion element. In the third step, the temperature of the light emitting surface is appropriately adjusted using a thermoelectric conversion element.

  In the above-described configuration, the plurality of temperature adjustment cells may include at least one temperature detection cell that detects a local temperature of the light-emitting panel. The third step may include a step of adjusting the temperature of the light emitting surface according to the temperature detected by the at least one temperature detection cell.

  According to the above configuration, the plurality of temperature adjustment cells include at least one temperature detection cell that detects a local temperature of the light-emitting panel. In the third step, the temperature of the light emitting surface is appropriately adjusted according to the temperature detected by at least one temperature detection cell.

  The principle according to the above-described embodiment is preferably applied to, for example, a display device for displaying an image and an illumination device including a light emitting panel.

400 ··········· Temperature adjustment device 410 ············· Cell element 411・ ・ ・ ・ ・ ・ Cell element 420 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Top surface 500 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Light emitting panel 540R, 540G, 540B ... Emission layer 551... Emission surfaces DR1 to DR16... Division regions T1 to T16.・ ・ ・ ・ ・ ・ Temperature data value

Claims (12)

A method of manufacturing a light emitting panel having a light emitting surface,
A first step of measuring a luminance distribution in the light emitting surface that is lighted over the entire surface;
A second step of dividing the light emitting surface into a plurality of regions and setting an aging temperature in each of the plurality of regions according to the luminance distribution;
A third step of causing the light emitting panel to emit light and adjusting the temperature of the light emitting surface,
In the third step, each of the plurality of regions is adjusted to the aging temperature set in the second step. The plurality of regions include a first region and a second region in which brightness higher than the first region is measured in the first step,
2. The manufacturing method according to claim 1, wherein the aging temperature set for the first region in the second step is higher than the aging temperature set for the second region. The light-emitting panel includes a plurality of light-emitting elements that emit light with different hues,
The plurality of light emitting elements include: a first light emitting element that emits light in a first hue; a second light emitting element that emits light in a second hue different from the first hue with higher luminous efficiency than the first light emitting element; Including,
The manufacturing method according to claim 1, wherein in the first step, the light emitting surface is entirely lit using a first light emitting element.   The manufacturing method according to claim 3, wherein the first light emitting element emits light with the lowest light emitting efficiency among the plurality of light emitting elements.   The manufacturing method according to claim 4, wherein the first light emitting element is an organic EL element that emits light in a blue hue. The third step includes monitoring a luminance distribution in the light emitting surface;
Comparing the width of the monitored luminance distribution with a threshold defined for the width of the luminance distribution;
6. The method includes: stopping light emission of the light-emitting panel and temperature adjustment for the light-emitting panel if the width of the luminance distribution is equal to or less than the threshold value. The manufacturing method as described in. A fourth step of resetting the aging temperature if the width of the luminance distribution exceeds the threshold;
The manufacturing method according to claim 1, further comprising a fifth step of adjusting the temperature of the light emitting surface under the aging temperature reset in the fourth step. Method.   8. The method according to claim 1, wherein the third step includes a step of bringing a temperature adjustment device having a temperature adjustment surface capable of adjusting each of the plurality of regions to different temperatures into contact with the light emitting panel. The manufacturing method of any one of Claims.   The manufacturing method according to claim 8, wherein the third step includes a step of bringing the temperature adjustment surface into contact with the light emitting panel and heating the plurality of regions.   The manufacturing method according to claim 8, wherein the third step includes a step of bringing the temperature adjustment surface into contact with the light emitting panel and cooling the plurality of regions. The temperature adjustment surface is formed by a plurality of temperature adjustment cells arranged in a matrix,
The temperature adjustment cell includes a thermoelectric conversion element,
The manufacturing method according to claim 8, wherein the third step includes a step of adjusting the temperature of the light emitting surface using the thermoelectric conversion element. The plurality of temperature adjustment cells include at least one temperature detection cell that detects a local temperature of the light emitting panel;
The method according to claim 11, wherein the third step includes a step of adjusting a temperature of the light emitting surface according to the temperature detected by the at least one temperature detection cell.

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