KR-20260064212-A - Real-time folding test device for flexible devices

KR20260064212AKR 20260064212 AKR20260064212 AKR 20260064212AKR-20260064212-A

Abstract

The present invention relates to a real-time folding test device for a flexible device that can observe physical changes in key parts of a specimen in real time while performing a folding test on a flexible device specimen required for the development of a prototype or mass-produced product of a flexible device, by providing a configuration including a first sensing module that detects shear deformation of the fold portion of the flexible device specimen and a measuring module that measures the repulsive force acting on the fold portion of the flexible device specimen, thereby enabling the real-time observation and detection of physical changes in key parts of the flexible device specimen to determine pass or fail status.

Inventors

문현봉
김종덕
한명수
허정욱
장석준

Assignees

주식회사 이노테크

Dates

Publication Date: 20260507
Application Date: 20241031

Claims (8)

A test device capable of detecting physical changes in a specimen in real time according to a folding test on a flexible device specimen mounted on a folding plate, A first sensing module for detecting shear deformation of the fold portion of the above flexible device specimen, A real-time folding test device for a flexible device characterized by including a measurement module for measuring the repulsive force acting on the folded portion of the flexible device specimen.
In paragraph 1, A second sensing module for detecting shear deformation at the end of the above flexible device specimen, It further includes a third sensing module for detecting the deformation state of the folded portion of the flexible device specimen, and A real-time folding test device for a flexible device, characterized in that the first sensing module, second sensing module, third sensing module, and measurement module are provided on a single base frame.
In paragraph 2, A real-time folding test device for a flexible device, characterized in that the first sensing module includes an optical camera and is mounted on the side portion of the folding plate adjacent to a guide line provided in the fold portion of the flexible device specimen to detect shear deformation of the fold portion of the flexible device specimen.
In paragraph 2, A real-time folding test device for a flexible device, characterized in that the above-described measurement module includes a load cell provided in a fixed support plate portion of the folding plate and measures the repulsive force according to the folding operation of the flexible device specimen.
In paragraph 2, A real-time folding test device for a flexible device, characterized in that the second sensing module is provided in the front portion of the folding plate and observes a cross-section of the flexible device specimen using an optical interferometer.
In paragraph 2, A real-time folding test device for a flexible device, characterized in that the third sensing module includes a laser displacement sensor and is mounted on the upper part of the curved portion of the flexible device specimen to detect a bending phenomenon in the curved portion of the flexible device specimen.
In any one of paragraphs 2 through 6, A real-time folding test device for a flexible device, characterized in that the sensing and measurement in the first sensing module, second sensing module, third sensing module, and measurement module are each executed as either independent execution, sequential execution, or simultaneous execution.
In Paragraph 7, A control unit that manages detection and measurement information in real time from the first detection module, second detection module, third detection module, and measurement module, A display unit that displays control status information in the above-mentioned control unit, A real-time folding test device for a flexible device, characterized by further including an alarm unit capable of notifying a manager of the selection of defective flexible device specimens by a test device according to control status information from the control unit above.

Description

Real-time folding test device for flexible devices The present invention relates to a real-time folding test device for a flexible device, and more particularly to a real-time folding test device for a flexible device capable of observing physical changes in key parts of a specimen in real time while performing a folding test on a flexible device specimen required for the development of a prototype or mass-produced product of a flexible device. Recently, with the advancement of the information society, the display industry is actively developing flexible display panels using substrates made of lightweight and flexible materials. In other words, the flexible display panel has the characteristic of being able to be flexibly bent according to the user's convenience. Therefore, the flexible device can be bent and used according to the user's convenience, and the portability and storage of the flexible device can be improved. Flexible devices equipped with such flexible display panels include, for example, flexible printed circuit boards (Flexible PCBs), Chip On Flexible Boards (COFs), and foldable displays. In particular, among flexible devices, a flexible device that implements a foldable display can be temporarily bent or maintain a bent state by an applied force, thereby allowing the user to view the screen displayed on the display in various areas according to their preference. The flexible device is required to have durability and operational stability not only in terms of bending characteristics but also when bent or folded beyond a certain angle, and must be able to display normal images in a folded state or in an unfolded state after being folded. As such, since the flexibility of a flexible device is one of the important performance characteristics of a flexible device, there is a need to develop a device capable of testing performance characteristics such as bending, twisting, and a certain level of stretching when manufacturing it. In other words, even if a flexible device is designed to possess flexible characteristics, it is important to ensure the reliability of the flexible device so that it is not damaged by bending. Accordingly, technology for testing the flexible characteristics of flexible devices, including the aforementioned flexible device, flexible display panels, flexible substrates, and base substrates of flexible substrates, is also being developed. An example of such technology is disclosed in the following patent documents 1 to 3, etc. For example, Patent Document 1 below discloses an OLED specimen testing device comprising: a testing machine that clamps both sides of a specimen and applies mechanical deformations such as stretching, fatigue loading, and bending to the specimen by the operation of an actuator; an electrical source-measuring machine that applies current and voltage of various intensities to the specimen clamped by the testing machine to measure whether a light-emitting element is short-circuited due to mechanical deformation and the amount of electrical resistance and current flow; a light sensor that receives light irradiated from the specimen and measures the mechanical properties of the specimen and optical characteristics according to the intensity of the current and electrical resistance; and a control box electrically connected to the testing machine, the electrical source-measuring machine, and the light sensor. In addition, Patent Document 2 discloses a stress test device comprising a base plate, a pair of driving units that rotate in forward and reverse directions, a support member that performs the operation of folding and unfolding a flexible display panel while gripping the flexible display panel on a first folding plate and a second folding plate, a first gear connected to each of the pair of driving units, a second gear that meshes with each of the first gears, a clamping member that grips both sides of the flexible display panel, a guide member that guides the central part of the flexible display panel, first and second vision cameras respectively placed on X and Y gantry positioned on the upper part of the base plate, and a vision camera control unit that controls the first and second vision cameras. Meanwhile, Patent Document 3 below discloses a flexible display folding device equipped with a vision inspection device that inspects for cracks by capturing a two-dimensional image of a flexible display while a camera unit moves in a straight line and transmits a power control signal to the camera unit according to a preset capture position and a preset number of camera captures, while performing a folding test in which half of the flexible display is folded and unfolded from 0 to 90 degrees in a horizontal plane after mounting one or more flexible displays. FIG. 1 is a block diagram of a real-time folding test device for a flexible device according to the present invention. FIG. 2 is a perspective view of a real-time folding test device of a flexible dev