KR102360943B1 - Evaluation equipment for evaluating the rolling reliability of rollable displays - Google Patents

Abstract

The present invention relates to a rolling reliability evaluation apparatus for a rollable display, and it is possible to accurately measure the light transmittance and haze values in real time while repeating the rolling operation by easily mounting the rollable display substrate without damage.
The present invention provides a head roller capable of repeatedly performing a rolling operation of winding and releasing the display substrate around its outer circumferential surface while holding and supporting one end of the rollable display substrate; a variable support for repeatedly performing advancing and retreating operations in response to the rolling motion of the head roller while holding and supporting the other end of the display substrate in response to the head roller; a light source irradiating light toward one surface of the display substrate; and a camera installed to measure light transmittance and haze values from the opposite side of the light source around the display substrate.

Description

EVALUATION EQUIPMENT FOR EVALUATING THE ROLLING RELIABILITY OF ROLLABLE DISPLAYS

The present invention relates to an evaluation device for a display, and in particular, a rolling reliability evaluation for a rollable display that can accurately measure light transmittance and haze values in real time while repeating a rolling operation by easily mounting a rollable display substrate without damage It's about the device.

As the display develops, it has developed from a flat type to a curved type and a foldable type, and recently, it is also developing into a rollable type.

In order to realize such a rollable display, it is necessary to solve the problem of reduced light transmittance or blurred image quality due to damage or cracks in the display substrate during use. Therefore, display companies, film manufacturers, display window manufacturers, OCA manufacturers, etc. should be equipped with an evaluation device to evaluate the rolling reliability according to the repetitive rolling motion of the rollable display substrate.

However, although it is known that some devices exist for evaluating the existing OLED flexible substrates, there is no device for evaluating the rolling reliability of rollable display substrates in earnest.

Therefore, it was necessary to develop a rolling reliability evaluation device that can accurately measure changes in light transmittance and haze values in real time while repeatedly rolling a rollable display substrate.

Korean Patent Publication No. 10-2019-0005302 (2019.01.16.)

Accordingly, the present invention has been proposed to solve the problems of the related art, and an object of the present invention is to accurately measure the light transmittance and haze values in real time while repeating the rolling operation by easily mounting the rollable display substrate without damage. It is to provide a rolling reliability evaluation device for a rollable display that can be measured.

In order to achieve the above object, the rolling reliability evaluation apparatus for a rollable display according to the technical idea of the present invention is a rolling that winds and unwinds the display substrate on its outer circumferential surface while holding and supporting one end of the rollable display substrate. A head roller that can perform repetitive motions; a variable support configured to repeatedly perform a forward/backward operation in response to the rolling operation of the head roller while holding and supporting the other end of the display substrate in response to the head roller; a light source irradiating light toward one surface of the display substrate; It is characterized in that it includes a camera installed to measure the light transmittance and haze values from the opposite side of the light source with respect to the display substrate.

Here, the head roller is made of a combination of a first head roller and a second head roller divided into two in the longitudinal direction, and between the first head roller and the second head roller, one end of the display substrate is detachably coupled to each other. It may be characterized in that it is fitted and supported.

In addition, semi-cylindrical protrusions and recesses are formed on the first and second contact surfaces of the first and second head rollers facing each other to correspond to each other, respectively, so that the display substrate can be sandwiched and supported in the winding direction. It may be characterized as such.

In addition, protrusions and recesses are formed on the first and second contact surfaces of the first head roller and the second head roller, and a first flat portion and a second flat portion are formed in the remaining portions to face and contact with each other, and the first plane It may be characterized in that flanges installed so as to be fastened while forming pairs with each other may be further provided at both ends of the part and both ends of the second flat part.

In addition, semi-cylindrical protrusions and concave portions are continuously formed on the first contact surface of the first head roller facing each other, and the second contact surface of the second head roller corresponds to the protrusion and concave portions formed on the first contact surface. It may be characterized in that the concave portion and the protrusion in contact with each other are continuously formed so as to be sandwiched between the protrusion and the concave facing each other in a winding direction to support the display substrate.

In addition, it characterized in that it further comprises a slide member for moving forward and backward together with the variable support in a state in which the variable support is supported from the lower side, and a pair of first guide rails for slidably supporting both ends of the slide member. can be done with

In addition, the light source and the camera are further provided with a second guide rail for supporting the light source to be slidable in the forward and backward direction of the display substrate, and a third guide rail for guiding the camera to be slidable in the forward and backward direction of the display substrate. It may be characterized in that it is possible to measure the light transmittance and haze values by moving to the point.

In addition, when the number of rolling for the display substrate is input by the user, the controller controls to wind and unwind the display substrate by the input number of rolling while repeatedly rolling the head roller in the forward and reverse directions by driving the motor, and at the same time The controller may control to measure light transmittance and haze values whenever rolling to the display substrate is repeated using the light source and the camera.

In addition, when the coordinate value of the measurement point of the display substrate is input, the controller tracks the measurement point of the input coordinate value while moving the light source and the camera to repeatedly measure the light transmittance and haze value of the measurement point. can be done with

In addition, pinions are detachably attached to both ends of the head roller, and a rack that meshes with the pinion and repeats a forward and backward operation by a rolling operation of the head roller is provided, and a variable support is coupled to the other end of the rack to provide a rack It may be characterized in that it is possible to repeat the forward and backward motions together.

The rolling reliability evaluation apparatus for a rollable display according to the present invention can accurately measure the light transmittance and haze values in real time while repeating the rolling operation by easily mounting the rollable display substrate without damage.

1 is a perspective view of a rolling reliability evaluation device for a rollable display according to an embodiment of the present invention;
2 is a perspective view of a head roller in a rolling reliability evaluation device for a rollable display according to an embodiment of the present invention;
3 is an exploded perspective view for explaining the configuration of a head roller in the rolling reliability evaluation apparatus for a rollable display according to an embodiment of the present invention;
4 is an exploded perspective view for explaining the configuration of a deformed head roller in the rolling reliability evaluation device for a rollable display according to an embodiment of the present invention;
5A and 5B are a series of reference views for explaining the operation and operation of the rolling reliability evaluation apparatus for a rollable display according to an embodiment of the present invention;
Figure 6 is a reference perspective view for explaining the rack and pinion structure for providing a driving force to the variable support in the rolling reliability evaluation apparatus for a rollable display according to an embodiment of the present invention
7A is a graph showing the measurement of the light transmittance change according to the number of rolling of the rollable display substrate using the rolling reliability evaluation apparatus for the rollable display according to the embodiment of the present invention;
7b is a graph showing the change in haze value according to the number of rolling of the rollable display substrate by using the rolling reliability evaluation apparatus for the rollable display according to the embodiment of the present invention;

A rolling reliability evaluation apparatus for a rollable display according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements. In the accompanying drawings, the dimensions of the structures are enlarged than actual for clarity of the present invention, or reduced than actual in order to understand the schematic configuration.

Also, terms such as first and second may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. Meanwhile, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

<Example>

1 is a perspective view of a rolling reliability evaluation apparatus for a rollable display according to an embodiment of the present invention, FIG. 2 is a perspective view of a head roller in a rolling reliability evaluation apparatus for a rollable display according to an embodiment of the present invention, and FIG. An exploded perspective view for explaining the configuration of a head roller in the rolling reliability evaluation device for a rollable display according to an embodiment of the present invention, and FIG. 4 is a head deformed in the rolling reliability evaluation device for a rollable display according to an embodiment of the present invention It is an exploded perspective view for explaining the configuration of the roller.

As shown, the rolling reliability evaluation apparatus for a rollable display according to an embodiment of the present invention includes a head roller 110, a variable support 120, a light source 130a, a camera 130b, a motor 140, and a device. The body 150 is included as a main component, and the rollable display substrate RD can be easily mounted without damage through these main components, and the light transmittance and haze values for the display substrate RD are measured while repeating the rolling operation. It is configured to accurately measure in real time.

Hereinafter, a rolling reliability evaluation apparatus for a rollable display according to an embodiment of the present invention will be described in detail with reference to each of the above components.

The head roller 110 serves to repeatedly perform a rolling operation of winding and releasing the display substrate RD around its outer circumferential surface while holding and supporting one end of the display substrate RD. To this end, the head roller 110 has a cylindrical shape as shown in FIGS. 2 and 3, and consists of a combination of a first head roller 110a and a second head roller 110b divided into two in the longitudinal direction. . And on the first and second contact surfaces of the first head roller 110a and the second head roller 110b facing each other, a semi-cylindrical protrusion 111a and a concave groove 111b are formed to correspond to each other, respectively. The display substrate RD is sandwiched and supported in a winding direction.

Here, the first and second contact surfaces of the first head roller 110a and the second head roller 110b have protrusions 111a and concave grooves 111b formed on the remaining portions of the first plane so as to face each other and contact each other. A portion 112a and a second flat portion 112b are formed. At both ends of the first flat portion 112a and both ends of the second flat portion 112b, flanges 113 installed so as to be fastened while forming a pair may be further provided. In the case of the flange 113, a bolt hole is provided, so that the first head roller 110a and the second head roller 110b can be coupled to each other through simple bolt fastening.

According to the configuration of the head roller 110, a semi-cylindrical protrusion 111a formed on the first contact surface and the second contact surface of the first head roller 110a and the second head roller 110b, respectively, and a recessed portion corresponding thereto One end of the display substrate RD can be easily sandwiched between the 111b and 111b. Particularly noteworthy in this configuration is that one end of the display substrate RD is sandwiched between the semi-cylindrical protrusions 111a formed on the first and second contact surfaces, respectively, and the corresponding recessed portions 111b. Since one end of the display substrate RD is not inserted in an upright state with respect to the outer circumferential surface of the head roller 110, but is already inserted to some extent in a lying state, when winding the display substrate RD around the head roller 110, one end is the starting point. It is possible to naturally wind without damage by adapting to the winding direction without bending it rapidly. As such, in the present invention, one end of the display can be simply inserted and supported on the head roller 110 without an adhesive or adhesive tape, so that it is possible to block an unpredictable weight change caused to the display substrate RD due to the use of an adhesive or adhesive tape. Damage caused by sandwiching and supporting one end of the display substrate RD to the 110 may also be prevented.

Meanwhile, the head roller 110 may be configured in a deformed Taegeuk shape as shown in FIG. 4 . In this case, a semi-cylindrical protrusion 111a and a concave groove 111b are continuously formed on the first contact surface of the first head roller 110a facing each other, and on the second contact surface of the second head roller 110b The protrusion 111a formed on the first contact surface and the concave portion 111b and the protrusion 111a contacting corresponding to the concave portion 111b are continuously formed between the protrusion 111a and the concave portion 111b which face each other. The display substrate RD may be sandwiched and supported in a winding direction. Even in the case of the deformed head roller 110, like the head roller 110 before deformation shown in FIG. 3, it is similar in that it can be naturally wound while holding one end of the display substrate RD.

The variable support 120 corresponds to the head roller 110 supporting one end of the display substrate RD, and corresponds to the rolling operation of the head roller 110 while holding and supporting the other end of the display substrate RD. Thus, the forward and backward movement is repeatedly performed. That is, when the head roller 110 rolls in the forward direction to wind the display substrate RD as shown in FIG. 5B , the variable support 120 advances toward the head roller 110 and vice versa, as shown in FIG. 5A , the head roller 110 When the display substrate RD rolled in the reverse direction is released, the variable support 120 is retracted in the opposite direction to the head roller 110 side.

The variable support 120 is made of a body in the form of a rectangular column laid down as shown in FIG. 1 and is provided in a form in which the divided upper body 120a and the lower body 120b are combined, so that the upper body 120a and the lower body 120a The other end of the display substrate RD is sandwiched between the body 120b to be supported. It is preferable that bolt holes are provided at both ends of the upper body 120a and the lower body 120b of the variable support 120 so that they can be easily bolted together.

Here, for the advancing and retreating operation of the variable support 120, a slide member 161b configured to advance and retreat together with the variable support 120 while supporting the variable support 120 from the lower side, and the slide member 161b A pair of first guide rails 161a for slidably supporting both ends of the . Here, a driving means (not shown) is installed to provide a driving force for moving forward and backward of the slide member 161b and the variable support 120 . In the case of the driving means, a pneumatic cylinder may be installed or a driving motor may be installed. When the drive motor is installed, general power transmission means such as a belt, chain, pulley, gear, etc. for converting rotational motion into linear motion in the middle and transmitting it may be added. In the case of such a driving means, since a known technique can be used, further detailed description will be omitted.

On the other hand, in order to implement the forward and backward movement of the variable support 120, as shown in FIG. 6, it is also possible to configure it in an original form using the rack 170b and pinion 170a structure. In this case, pinions 170a are detachably coupled to both ends of the head roller 110, and the rack 170b is meshed with the pinion 170a to advance and retreat by the rolling operation of the head roller 110. A variable support 120 is coupled to the other end of the rack 170b so as to move forward and backward together along the rack 170b that moves forward and backward. As such, when the head roller 110 and the variable support 120 are connected through the rack 170b and pinion 170a combination, there is no need to additionally install a separate driving means, and only one motor 140 rolls the head roller 110. It has the advantage of being able to advance and retreat up to the variable support 120 as a result.

The light source 130a and the camera 130b are installed on the lower side and the upper side with respect to the display substrate RD. When the light source 130a irradiates light toward the display substrate RD, the camera 130b is photographed from the opposite side. to measure light transmittance and haze.

Here, a second guide rail 162 supporting the light source 130a to be slidable in the forward and backward direction of the display substrate RD, and guide the camera 130b to be slidable in the forward and backward direction of the display substrate RD A third guide rail 163 is further provided. Accordingly, the light source 130a and the camera 130b move along the second guide rail 162 and the third guide rail 163 to move forward and backward, respectively. As a result, the light source 130a and the camera 130b move along the display substrate RD that is displaced while being wound and unwound on the head roller 110 while tracking the measurement point of a specific coordinate value set by a user input in real time to light transmittance And it becomes possible to measure the haze value repeatedly.

Meanwhile, a driving means (not shown) is further installed to provide driving force so that the light source 130a and the camera 130b can move forward and backward, respectively. In the case of the driving means for providing the driving force to the light source 130a and the camera 130b, a pneumatic cylinder or a driving motor may be installed as in the driving means for moving the variable support 120 forward and backward. When the drive motor is installed, general power transmission means such as a belt, chain, pulley, gear, etc. for converting rotational motion into linear motion in the middle and transmitting it may be added. In the case of such a driving means, since a known technique can be used, further detailed description will be omitted.

The device body 150 serves as a base for supporting other components from the lower side structurally as shown in FIG. 1 . To this end, the device body 150 has a sufficiently large area, and includes a plurality of vertical supports 153a for supporting the head roller 110, the motor 140, the first guide rail 161a, and the third guide. A frame assembly 153b installed to support the rail 163 is provided.

In addition, the device body 150 has a built-in controller and memory for controlling the overall device, and a display window 151 and an operation button 152 provided with an inputable touch panel are installed. When the user inputs the number of rolling for the display substrate RD using the display window 151 of the device body 150, the controller drives the motor 140 in the forward and reverse directions while performing the rolling operation of the head roller 110. The display substrate RD is wound and unwound by the input number of rolling. At this time, the light source 130a and the camera 130b are controlled to measure light transmittance and haze values while tracking and moving a designated coordinate point of the display substrate RD that repeats forward and backward motions. At this time, the light transmittance, haze value, and image information measured for the display substrate RD are stored in the memory, and the number of rolling and the corresponding light transmittance and haze value change are displayed in real time through the display window 151 .

<Experimental example>

The reliability characteristics of the display substrate were evaluated using the rolling reliability evaluation apparatus for a rollable display according to an embodiment of the present invention. The display substrate used at this time was composed of a polymer film and UTG (Ultra Thin Glass). In the evaluation, the change of the display substrate was optically measured while changing the number of rolling of the display substrate from 10,000 times to 100,000 times. First, the light transmittance according to the number of rollings was measured, and secondly, the haze value according to the number of rollings was measured.

As a result of the measurement, it was confirmed that the light transmittance was maintained at 95% or more without change until the number of rolling 60,000 times, but gradually decreased from 70,000 times to reach the level of 91~93%. It is understood that factors inhibiting light transmittance such as micro-cracks or floating between the polymer film and UTG occur in the UTG of the display substrate from 70,000 rolling times. Furthermore, it was confirmed that the haze value also increased from 70,000 times of rolling, which indicates that there is a change in the inside of the polymer film of the display substrate or the adhesive layer bonding the polymer film and UTG.

In order to examine this in detail, it was observed that there was a change in the adhesive layer between the polymer film and the UTG as a result of examining it with a microscope of 500 times. That is, the adhesive layer provided with double-sided tape from 70,000 times of rolling could not withstand the tensile and contractive forces caused by repeated rolling operations in the middle, and the adhesive function deteriorated, thereby worsening the light transmittance and haze values. Looking at the image taken with the camera of the part where the light transmittance was a problem, it was confirmed that the space between the polymer film and the UTG was swollen.

In the case of the rolling reliability evaluation apparatus for a rollable display according to an embodiment of the present invention, when the user inputs and sets the number of rolling, the light transmittance and haze value according to the number of rolling are automatically measured as shown in FIGS. 8A and 8B, and the measured value It is possible to accurately and conveniently perform rolling reliability evaluation for rollable display substrates because it has a function to store in the memory.

Although preferred embodiments of the present invention have been described above, various changes, modifications and equivalents may be used in the present invention. It is clear that the present invention can be equally applied by appropriately modifying the above embodiments. Accordingly, the above description is not intended to limit the scope of the present invention, which is defined by the limits of the following claims.

110: head roller 111a: protrusion
111b: recessed portion 112a: first flat portion
112b: second flat portion 120: variable support
130a: light source 130b: camera
140: motor 150: device body

Claims (10)

As a rolling reliability evaluation device for a rollable display for evaluating the rolling reliability of a rollable display substrate,
a head roller capable of repeatedly performing a rolling operation of winding and releasing the display substrate around its outer circumferential surface while holding and supporting one end of the rollable display substrate; a variable support for repeatedly performing advancing and retreating operations in response to the rolling motion of the head roller while holding and supporting the other end of the display substrate in response to the head roller; a light source irradiating light toward one surface of the display substrate; and a camera installed to measure light transmittance and haze values from the opposite side of the light source around the display substrate.
A second guide rail for supporting the light source so as to be slidable in the forward and backward direction of the display substrate, and a third guide rail for guiding the camera to be slidable in the forward and backward direction of the display substrate, to a point where the light source and the camera are set Rolling reliability evaluation device for rollable display, characterized in that it is moved to measure light transmittance and haze values. The method of claim 1,
The head roller is made of a combination of a first head roller and a second head roller divided into two in the longitudinal direction, and one end of the display substrate is inserted between the first head roller and the second head roller to be detachably coupled to each other. Rolling reliability evaluation device for a rollable display, characterized in that supported. 3. The method of claim 2,
Semi-cylindrical protrusions and recesses are formed on the first and second contact surfaces of the first and second head rollers facing each other to correspond to each other, respectively, so that the display substrate can be sandwiched and supported in the winding direction. Rolling reliability evaluation device for a rollable display, characterized in that. 4. The method of claim 3,
A protrusion and a concave portion are formed on the first contact surface and the second contact surface of the first head roller and the second head roller, and a first flat portion and a second flat portion are formed in the remaining portions to face and contact each other, and both sides of the first flat portion A rolling reliability evaluation device for a rollable display, characterized in that the flanges installed so as to be fastened while forming a pair with each other are further provided at both ends of the end and the second flat portion. 3. The method of claim 2,
A semi-cylindrical protrusion and a concave portion are continuously formed on a first contact surface of the first head roller facing each other, and a protrusion and a concave portion formed on the first contact surface are in contact with the second contact surface of the second head roller. A rolling reliability evaluation device for a rollable display, characterized in that the concave portion and the protruding portion are continuously formed so that the display substrate can be sandwiched and supported in the winding direction between the protruding portion and the concave portion facing each other. 3. The method of claim 2,
A slide member configured to move forward and backward together with the variable support in a state in which the variable support is supported from the lower side, and a pair of first guide rails for slidably supporting both ends of the slide member Rolling reliability evaluation device for rollable displays. delete The method of claim 1,
When the number of rolling for the display substrate is input by the user, the controller controls to wind and unwind the display substrate by the input number of rolling while repeatedly rolling the head roller in the forward and reverse directions by driving the motor,
At the same time, the controller uses the light source and the camera to measure the light transmittance and haze values whenever rolling on the display substrate is repeated. 9. The method of claim 8,
When the coordinate value of the measurement point of the display substrate is input, the controller tracks the measurement point of the input coordinate value while moving the light source and the camera to repeatedly measure the light transmittance and haze value of the measurement point, characterized in that Rolling reliability evaluation device for rollable displays. The method of claim 1,
A pinion is detachably attached to both ends of the head roller, and a rack that meshes with the pinion and repeats a forward and backward motion by a rolling operation of the head roller is provided, and a variable support is coupled to the other end of the rack to follow the rack. A rolling reliability evaluation device for a rollable display, characterized in that it can repeat the forward and backward motions together.

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