KR101831610B1 - Lifetime measurement system for flexible organic light emitting diodes - Google Patents
Lifetime measurement system for flexible organic light emitting diodes Download PDFInfo
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- KR101831610B1 KR101831610B1 KR1020160020471A KR20160020471A KR101831610B1 KR 101831610 B1 KR101831610 B1 KR 101831610B1 KR 1020160020471 A KR1020160020471 A KR 1020160020471A KR 20160020471 A KR20160020471 A KR 20160020471A KR 101831610 B1 KR101831610 B1 KR 101831610B1
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- light emitting
- organic light
- flexible organic
- emitting device
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- 238000005259 measurement Methods 0.000 title description 15
- 239000013307 optical fiber Substances 0.000 claims abstract description 42
- 238000005452 bending Methods 0.000 claims abstract description 25
- 230000008859 change Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims description 6
- 238000001228 spectrum Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 238000011156 evaluation Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 9
- 230000003287 optical effect Effects 0.000 description 7
- 230000003595 spectral effect Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000470 constituent Substances 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000003252 repetitive effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000001748 luminescence spectrum Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 238000004904 shortening Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0425—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using optical fibers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/02—Details
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/44—Electric circuits
- G01J2001/4446—Type of detector
- G01J2001/446—Photodiode
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- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The present invention discloses an apparatus for measuring the lifetime of a flexible organic light emitting device. The flexible organic light emitting device life measuring apparatus of the present invention comprises a curvature adjusting unit, a roller fixing unit, and a back plate for measuring a lifetime of a flexible organic light emitting diode by adjusting a bending angle of the flexible organic light emitting diode, An optical fiber disposed at an upper portion of the curvature adjuster and connected to the outside; A measuring unit arranged to measure an amount of light transmitted from the flexible organic light emitting diode by the optical fiber from outside; And a temperature control chamber in which the lifetime measuring device excluding the measuring portion is accommodated.
Flexible Organic Light Emitting Diodes (OLEDs) are tested for bending and the change of luminance is measured in real time.
Therefore, the flexible organic light emitting device lifetime measuring apparatus of the present invention can measure the change in luminance and chromaticity in real time by collecting the light amount information corresponding to the number of times of warping or folding of the flexible organic light emitting device in various temperatures in a spectrum, There is an effect that the lifetime characteristic and the durability evaluation can be made precisely by the display of the change of the luminance and the chromaticity of the organic light emitting element.
Description
The present invention relates to a flexible organic light emitting device lifetime measuring device, and more particularly, to a flexible organic light emitting device lifetime measuring device that repeatedly bends or folds a flexible organic light emitting device at a driving temperature interval, measures luminance of the flexible organic light emitting device in real time through an optical fiber, And measuring the lifetime of the organic light emitting device at various temperature intervals.
2. Description of the Related Art In general, a flat panel display device includes a liquid crystal display (LCD), a plasma display panel (PDP), an electrophoretic display device, and an organic light emitting display (OLED) .
They are thinner and lighter than conventional cathode ray tube displays (CRTs) and can operate at low power and low driving voltage, and are used in various electronic devices.
Particularly, the electrophoretic display and the organic light emitting diode display (OLED) are advantageous in that the layers formed on the substrate are organic layers having elasticity, have a high response speed, have a high luminous efficiency, a high luminance and a wide viewing angle, Technology is easy to apply.
In recent years, development of a flexible display using a flexible organic light emitting element that can be bent or folded by replacing a substrate used in the flat panel display with a flexible substrate from a glass substrate has been actively under way. The flexible display device is provided with a bendable display device flexibly bent at a predetermined angle, a collapsible foldable display device, a rollable display device that can be rolled up like a paper, And a stretchable display device.
The flexible display device using the flexible organic light emitting element basically has a characteristic that the display device is bent or folded, and when the flexible display device is bent or folded repeatedly, there arises a problem such as deterioration of the screen quality unlike the area where it is not.
Therefore, when the flexible display device using the flexible organic light emitting device is bent or folded repeatedly, it is necessary to quickly analyze the quality difference of the image quality that occurs sequentially in the deflection area of the flexible organic light emitting device and to measure the lifetime of the flexible organic light emitting device .
This is because life is shortened when the flexible organic light emitting element is bent or folded by repeatedly bending or folding the flexible organic light emitting element for a long period of time, so that the durability that the flexible organic light emitting element can endure and the change in physical properties of the element structure need to be analyzed and grasped.
On the basis of the above analysis, selection of a constituent material for improving the durability of the flexible organic light emitting device or modification of the manufacturing method can be developed, which can serve as a basis for extending the lifetime of the flexible organic light emitting device.
Further, based on the above analysis, it is possible not only to improve the physical durability of the flexible organic light emitting device, but also to reduce the deterioration of image quality due to warping by supplying the compensated pixel signal to the pixels corresponding to the warped or folded areas.
However, in the prior art, the life of the flexible organic light emitting element is reduced or collapsed, and the lifetime shortening degree (degree of degradation of the screen quality, etc.) is firstly repeatedly bent or folded into a plurality of flexible organic light emitting elements, A method of inspecting each flexible organic light emitting device is used.
Therefore, when the flexible organic light emitting device is repeatedly bent or folded, there is a disadvantage in that it can not be concretely understood whether the durability limit is exceeded at any stage and a change in the device constituent material occurs. Accordingly, there have been limitations in developing an effective and appropriate improvement measure for the life measurement and the life extension of the flexible organic light emitting device.
The present invention relates to a flexible organic electroluminescent device in which a flexible organic electroluminescent device is repeatedly bent or folded to measure the light quantity of the flexible organic electroluminescent device and an optical fiber is disposed in the flexible organic electroluminescent device driven in various temperature ranges, The present invention provides a flexible organic light emitting device lifetime measuring device that collects in real time through a light sensor and a spectrophotometer,
Further, according to the present invention, the brightness change and the light amount information corresponding to the number of times of flexing or folding of the flexible organic light emitting device can be collected without loss of light by the temperature control chamber in which the lifetime measuring device is accommodated, It is another object of the present invention to provide a flexible organic light emitting device lifetime measuring device capable of more precisely evaluating lifetime characteristics and durability of an organic light emitting device.
According to an aspect of the present invention, there is provided an apparatus for measuring lifetime of a flexible organic light emitting diode, including a curvature adjusting unit, a roller fixing unit, and a back plate Wherein the flexible organic light emitting element is measured by measuring a light quantity of light according to a drive temperature of the flexible organic light emitting element driven in various temperature ranges by a measuring unit, So that it is possible to measure the change of the luminance by the light source in real time.
The optical fiber is disposed on the upper portion of the curvature adjusting unit, and the amount of light of the flexible organic light emitting device is measured by the measuring unit through the optical fiber. The life of the flexible organic light emitting device excluding the measuring unit, A temperature control chamber is provided to accommodate the measuring device.
The optical fiber extends outward from the curvature adjusting unit and measures the light amount of the flexible organic light emitting diode with the measuring unit disposed outside the curvature adjusting unit through the extended optical fiber.
The measuring unit is an optical sensor for measuring the luminance according to the amount of light.
The measuring unit may further include a spectrophotometer or a photodiode for directly measuring the quantity of light, the spectrometer collecting the quantity of light in real time in a spectrum and detecting a change in color.
And a position sensor unit disposed on the back plate for counting the number of times of back and forth repetition of the back plate.
INDUSTRIAL APPLICABILITY The flexible organic light emitting device lifetime measuring apparatus of the present invention is capable of real time measuring the light quantity of the flexible organic light emitting device through an optical fiber without loss of light from outside while repeatedly bending or folding the flexible organic light emitting device.
The flexible organic light emitting device life measuring apparatus of the present invention can collect light quantity information corresponding to the number of times of bending or folding of the flexible organic light emitting device in real time to precisely evaluate the life characteristics and durability of the flexible organic light emitting device There is an effect that can be.
In addition, the light amount can be collected in real time as a spectrum through a spectrophotometer, and the luminance as well as the chromaticity of the flexible organic light emitting device can be measured.
1 is a perspective view showing a flexible organic light emitting device lifetime measuring apparatus according to the present invention.
2 is a front view showing a flexible organic light emitting element lifetime measuring apparatus according to the present invention.
3 is a partial front view of the flexible organic light emitting device lifetime measuring apparatus according to the present invention
4A is a view showing a roller fixing means used in the flexible organic light emitting element lifetime measuring apparatus of the present invention
4B is a view showing a state where the flexible organic light emitting element is fixed using the roller fixing means according to the present invention
5A is a view showing a set of back plates of the flexible organic light emitting element lifetime measuring apparatus according to the present invention
5B is a view showing a state in which the roller fixing means is fastened to the back plate of the present invention
6 is an exploded perspective view of an optical sensor supporting part, a flexible organic light emitting element fixing part and a curvature adjusting part of the flexible organic light emitting device lifetime measuring device of the present invention
7A and 7B are views showing the fastening structure of the flexible organic light emitting element fixing portion and the curvature adjusting portion of the flexible organic light emitting element lifetime measuring apparatus of the present invention
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.
The shapes, sizes, ratios, angles, numbers, and the like disclosed in the drawings for describing the embodiments of the present invention are illustrative, and thus the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.
In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.
In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.
In the case of a description of a temporal relationship, for example, if the temporal relationship is described by 'after', 'after', 'after', 'before', etc., May not be continuous unless they are not used.
The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.
It is to be understood that each of the features of the various embodiments of the present invention may be combined or combined with each other, partially or wholly, technically various interlocking and driving, and that the embodiments may be practiced independently of each other, It is possible.
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the size and thickness of the device may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.
FIG. 1 is a perspective view illustrating a flexible organic light emitting device lifetime measuring apparatus according to the present invention, FIG. 2 is a front view illustrating a flexible organic light emitting device lifetime measuring apparatus according to the present invention, and FIG. 3 is a cross- And Fig.
1 to 3, the flexible organic light emitting device
The
For example, when the radius R of the
Conversely, when the radius R of the
Accordingly, the flexible organic light emitting
In addition, the optical
The flexible organic light emitting
The measuring
The spectral information collected by the spectrophotometer is converted into a CIE color coordinate through a tristimulus value. If the spectral information is out of the conversion width of the CIE color coordinate required by the measurer, the collected spectral information has an eye sensitivity value And converted into optical output values.
The luminance or luminosity (assuming the lambda cyan plane emission) is obtained through the light emission area where the converted light output value is input, and the luminance and CIE color coordinates according to the number of bending times of the flexible organic light emitting device are stored and output. Minimize the amount of data to be output and stored by storing the spectral data only when the change is large. Further, the current according to the voltage applied to the flexible organic light emitting device is measured to store and output a change in resistance according to the number of bending cycles.
Is used as a system for measuring the time-light amount by the optical sensor of the measuring
In addition, the chromaticity change according to the CIE 1931 standard chromaticity coordinate is expressed as a change in characteristics of the flexible organic light emitting device according to the severe condition time.
In order to maintain the measurement accuracy of the measurement system according to the curvature radius of the drive system of the bending test apparatus of the present invention and the temperature of the
In the present invention, it is preferable that the
The
The roller fixing means 300 may be configured such that the
Therefore, since the
The
Since the
The fixing holes formed in the
A
Therefore, the number of repetitions of the
In the present invention, as the flexural or folding test is performed on the flexible organic
Although not shown in the drawings,
The specific operation of the flexible organic light emitting device
First, a
That is, the roller fixing means 300 is fixed to both sides of the
The position of the roller fixing means 300 may be adjusted according to the degree of curvature of the
When the flexible organic
The degree of fixation of the flexible organic
Then, power is supplied to the flexible organic
At this time, the
As described above, the
When the
As described above, when the flexible organic
The
In addition, the
Therefore, the flexible organic light emitting device
That is, in the present invention, since the amount of light and the spectrum corresponding to the number of times the flexible organic
As described above, the flexible organic light emitting device
FIG. 4A is a view showing roller fixing means used in the flexible organic light emitting device life measuring apparatus of the present invention, and FIG. 4B is a view showing fixing the flexible organic light emitting element using the roller fixing means according to the present invention FIG. 5A is a view showing the structure of the back plate of the flexible organic light emitting device life measuring apparatus according to the present invention, and FIG. 5B is a view showing a state in which the roller fixing means is fastened to the back plate of the present invention.
Referring to FIGS. 4A and 5B, the
However, in the present invention, the size of the
The width of the rollers of the
The roller fixing means 300 may be constituted by a pair of first and
The
The
The roller fixing means 300 having the above-described configurations is arranged to face the
4B, the flexible organic
The roller fixing means 300 is provided at one side of the supporting
The roller fixing means 300 fixed to the
Therefore, the flexible organic
5A and 5B, the
The
A plurality of first and second fixing holes H1 and H2 are formed at a boundary between the
The position of the roller fixing means 300 can be variously selected according to the degree of bending or folding of the flexible organic
Since the
As shown in the figure, the
6A and 6B are exploded perspective views of an optical sensor supporting unit, a flexible organic light emitting diode fixing unit and a curvature adjusting unit of the flexible organic light emitting device lifetime measuring apparatus according to the present invention. FIGS. 7A and 7B are cross- FIG. 5 is a view showing the fastening structure of the organic light emitting element fixing portion and the curvature adjusting portion. FIG.
6 to 7B, a flexible organic light emitting
A second open region B is formed at the center of the flexible organic light emitting
Therefore, the flexible organic light emitting
An optical
7A and 7B, the flexible organic light emitting
1, a flexible organic
The second open area B formed at the center of the flexible organic light emitting
The fixing
Therefore, even if the thickness of the flexible organic light emitting device to be subjected to the lifetime measurement is different, the flexible organic
As described above, the flexible organic light emitting device life measuring apparatus of the present invention has the effect of measuring the light quantity and spectrum of the flexible organic light emitting device while repeatedly bending or folding the flexible organic light emitting device.
The flexible organic light emitting device lifetime measuring apparatus of the present invention can collect light quantity information corresponding to the number of times of bending or folding of the flexible organic light emitting device and can accurately evaluate the life characteristics and durability of the flexible organic light emitting device. It is effective.
The above-described flexible organic light emitting device lifetime measuring apparatus of the present invention can simultaneously perform CIE color coordinate analysis and light amount analysis through spectral analysis as well as light quantity measurement of a flexible organic light emitting device in real time under repeated bending conditions. Accordingly, representative panel manufacturing companies in Korea should be actively utilized in the evaluation of durability of flexible organic light emitting devices. Also, at the material development research institute for electrode materials and OLEDs, The application of the bending test apparatus of the present invention to the evaluation of the stability and durability of the material is indispensable.
100: Flexible organic light emitting device lifetime measuring device
101: Base frame
120:
130: Curvature control unit
150:
135: flexible organic light emitting element fixing section
180:
181: Optical fiber
185: fiber optic support
200: Flexible organic light emitting device
210: temperature control chamber
300: Roller fixing means
330: Adjusting bolt
Claims (6)
A curvature-adjusting portion having a predetermined length to adjust an angle of bending or folding of a portion of the flexible organic light emitting device on a top surface thereof;
A roller fixing means disposed on the upper side and the lower side of the flexible organic light emitting device so as to face each other and including a first roller portion and a second roller portion for preventing the flow of the flexible organic light emitting device;
A back plate on which one end of the first roller portion and the second roller portion are fixed, and the flexible organic light emitting diode is reciprocated up and down so as to have a predetermined curvature; And
The amount of light of the flexible organic light emitting device is measured according to the driving temperature of the flexible organic light emitting device driven at various temperature intervals, Wherein the curvature adjusting unit, the roller fixing unit, and the back plate are installed inside the chamber, and the measuring unit is provided in the chamber, Wherein the optical fiber is disposed outside the chamber, and the optical fiber is extended and coupled.
The curvature control unit adjusts a degree of bending or folding of the flexible organic light emitting diode by adjusting a curvature (1 / R) according to a radius (R) of a cross section circle in a cylindrical structure,
Wherein the flexible organic light emitting device has a temperature control chamber to accommodate the lifetime measuring device except for the measuring unit so that the flexible organic light emitting device can be bent at various driving temperatures.
Further comprising: a position sensor unit disposed at one side edge region of the back plate and measuring a repetition number of the back plate that is moving up and down,
Wherein the number of repetitions of the back plate detected by the position sensor unit corresponds to the number of times of flexing or folding of the flexible organic light emitting device and a change in the amount of light of the flexible organic light emitting device corresponding to the number of flexing or folding of the flexible organic light emitting device Wherein the lifetime of the flexible organic light emitting device is estimated and measured.
The back plate has a U-shaped structure, and a plurality of first and second fixing holes (H1, H2) are bored in both upper end portions of the back plate. Fixed on both side regions,
Wherein the fixed positions of the first roller portion and the second roller portion are coupled to the first and second fixing holes H1 and H2 according to a degree of curvature of the curvature control portion. Measuring device.
Wherein the first roller portion and the second roller portion have a longitudinal support portion, a fixing portion disposed at one side edge of the support portion and fastened to the fixing holes H1 and H2 of the back plate, 1 and a second roller, a distance adjusting unit for adjusting the distance between the first and second rollers, and first and second guides respectively disposed on the first and second rollers, Wherein the flexible organic light emitting device is moved on a distance adjusting unit to match the width of the flexible organic light emitting device.
A flexible organic light emitting element fixing part having a second open area B formed at the center thereof to expose the flexible organic light emitting element is disposed on the flexible organic light emitting element, Wherein the distance between the flexible organic light emitting diode fixing part and the curvature adjusting part is adjusted by a fixing screw formed on the flexible organic light emitting diode fixing part, Flexible organic light emitting device lifetime measuring device.
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| KR1020160020471A KR101831610B1 (en) | 2016-02-22 | 2016-02-22 | Lifetime measurement system for flexible organic light emitting diodes |
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| KR1020160020471A KR101831610B1 (en) | 2016-02-22 | 2016-02-22 | Lifetime measurement system for flexible organic light emitting diodes |
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| KR101831610B1 true KR101831610B1 (en) | 2018-04-04 |
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| KR102021053B1 (en) * | 2017-12-29 | 2019-09-11 | 배재대학교 산학협력단 | Oled test apparatus and method |
| CN117352414B (en) * | 2023-11-23 | 2024-06-18 | 深圳市丰颜光电有限公司 | Diode testing process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005122702A1 (en) * | 2004-06-16 | 2005-12-29 | Sharp Kabushiki Kaisha | Organic electroluminescence element, and inspecting apparatus and inspecting method thereof |
| KR101527815B1 (en) * | 2015-01-15 | 2015-06-10 | 주식회사 지엔티시스템즈 | Folding examination apparatus for foldable display and folding examination method using this |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005122702A1 (en) * | 2004-06-16 | 2005-12-29 | Sharp Kabushiki Kaisha | Organic electroluminescence element, and inspecting apparatus and inspecting method thereof |
| KR101527815B1 (en) * | 2015-01-15 | 2015-06-10 | 주식회사 지엔티시스템즈 | Folding examination apparatus for foldable display and folding examination method using this |
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