JP-7857071-B2 - Flexible display device and method for manufacturing a flexible display device

JP7857071B2JP 7857071 B2JP7857071 B2JP 7857071B2JP-7857071-B2

Inventors

趙動旭
平林英史

Assignees

エルジーディスプレイカンパニーリミテッド

Dates

Publication Date: 20260512
Application Date: 20190802

Claims (11)

A display panel having a display surface and a non-display surface on the opposite side of the display surface, A member provided on the display surface of the display panel, A polarizing plate is provided between the display panel and the member, A first optical adhesive layer is provided between the polarizing plate and the member, A second optical adhesive layer is provided between the display surface of the display panel and the polarizing plate, A metal layer provided below the non-display surface of the display panel, which dissipates heat generated by the display panel, A third optical adhesive layer is provided between the display panel and the metal layer, A back plate is placed on the lower surface of the metal layer, An adhesive layer is disposed between the metal layer and the back plate, and adheres the lower surface of the metal layer to the upper surface of the back plate. Equipped with, The first optical adhesive layer, the second optical adhesive layer, and the third optical adhesive layer are in the form of a film and have thixotropic properties. The adhesive layer is formed from a material different from the first optical adhesive layer, the second optical adhesive layer, and the third optical adhesive layer, and does not have thixotropy. The metal layer is a mesh-shaped metal sheet that covers the entire non-display surface of the display panel and is provided between the third optical adhesive layer and the adhesive layer. Flexible display device.
The axial direction of the polarization axis of the polarizing plate is perpendicular to one direction in which the display panel can be folded. The flexible display device according to claim 1.
Each of the first optical adhesive layer, the second optical adhesive layer, and the third optical adhesive layer comprises a resin composition and an additive that imparts thixotropy. The flexible display device according to claim 1 or 2.
The additive consists of a sheet-like two-dimensional single crystal separated from a layered inorganic compound, and is dispersed within the resin composition. The flexible display device according to claim 3.
The aforementioned layered inorganic compound is one of montmorillonite, bentonite, hectorite, or octosilicate. The flexible display device according to claim 4.
The content of the two-dimensional single crystal in each of the first optical adhesive layer, the second optical adhesive layer, and the third optical adhesive layer is set to 0.1 to 30 weight percent. The flexible display device according to claim 4 or 5.
The length of the two-dimensional single crystal is 10 to 1000 nanometers, and the thickness of the two-dimensional single crystal is 1 to 1000 nanometers. The flexible display device according to any one of claims 4 to 6.
The thixotropy index values of the first optical adhesive layer, the second optical adhesive layer, and the third optical adhesive layer are set to 1 to 1000. A flexible display device according to any one of claims 1 to 7.
The display panel includes an organic light-emitting element. The flexible display device according to any one of claims 1 to 8.
The flexible display device according to claim 1, further comprising an impact-absorbing film disposed on the lower surface of the backplate.
A step of generating a display panel having a display surface and a non-display surface on the opposite side of the display surface, A step of providing a film-like first optical adhesive layer on the display surface of the display panel, A step of providing a polarizing plate on the first optical adhesive layer and bonding the display surface of the display panel and the polarizing plate using the first optical adhesive layer, The process of providing a film-like second optical adhesive layer on the polarizing plate, A step of providing a cover window on the second optical adhesive layer and bonding the cover window and the polarizing plate using the second optical adhesive layer, A step of providing a film-like third optical adhesive layer beneath the non-display surface of the display panel, A step of providing a metal layer below the third optical adhesive layer to dissipate heat generated by the display panel , and bonding the display panel and the metal layer using the third optical adhesive layer, The step of providing an adhesive layer beneath the metal layer, A step of providing a back plate beneath the adhesive layer and bonding the metal layer and the back plate, Equipped with, The first optical adhesive layer, the second optical adhesive layer, and the third optical adhesive layer have thixotropic properties. The adhesive layer is formed from a material different from the first optical adhesive layer, the second optical adhesive layer, and the third optical adhesive layer, and does not have thixotropy. The metal layer is a mesh-shaped metal sheet that covers the entire non-display surface of the display panel and is provided between the third optical adhesive layer and the adhesive layer. A method for manufacturing a flexible container.

Description

This invention relates to a flexible display device and a method for manufacturing a flexible display device. Patent Document 1 discloses a flexible display device having a structure in which a display panel, a touchscreen, and a window member are stacked, and which is bendable in a predetermined area. Japanese Patent Publication No. 2017-146586 This block diagram shows a schematic configuration of a flexible display device according to one embodiment.This is an array diagram of pixels and sub-pixels in a display unit according to one embodiment.This is a circuit diagram illustrating the schematic configuration of a sub-pixel according to one embodiment.This is a cross-sectional view of the display unit shown in Figure 1, along the line I-I'.This is a cross-sectional view showing an example of the internal structure of a display panel according to one embodiment.This figure illustrates the relationship between fluid viscosity and shear rate in one embodiment.This figure illustrates the relationship between the polarization axis direction and the bending direction in a polarizing plate according to one embodiment.This figure shows an example of the shape of a metal mesh layer according to one embodiment.This figure shows an example of the shape of a metal mesh layer according to one embodiment.This figure shows an example of the shape of a metal mesh layer according to one embodiment.This figure illustrates the heat distribution in a display panel according to one embodiment.This figure illustrates the heat distribution in a display panel according to one embodiment.This flowchart shows an example of a method for manufacturing a flexible display device according to one embodiment.This figure illustrates the pencil hardness of a display unit according to one embodiment.This is a cross-sectional view showing the state of the display unit when it is folded according to one embodiment. The embodiments of the present invention will be described in detail below with reference to the drawings. Elements having a common function throughout the drawings are denoted by the same reference numerals, and redundant explanations may be omitted or simplified. Figure 1 is a schematic diagram of the flexible display device according to this embodiment. The flexible display device according to this embodiment is a device that displays an image on the display unit 1 based on input RGB data. Flexible display devices can include foldable display devices (which can be folded), rollable display devices (which can be rolled up), and bendable display devices (which can be bent and extended). The applications of flexible display devices may include, but are not limited to, computer image output devices, large displays, television receivers, smartphones, tablet devices, and game consoles. Furthermore, while this embodiment describes a case where the flexible display device uses a top-emission method, the light emission method is not limited. As shown in Figure 1, the flexible display device comprises a display unit 1, a timing controller (TCON) 2, multiple source drive ICs (SDICs) 3, and multiple gate drive ICs (GDICs) 4. The display unit 1 has multiple pixels arranged in a matrix and displays an image. The timing controller 2 is communicated with multiple source drive ICs 3 and multiple gate drive ICs 4. The timing controller 2 controls the operating timing of the multiple source drive ICs 3 and multiple gate drive ICs 4 based on timing signals (vertical synchronization signals, horizontal synchronization signals, data enable signals, etc.) input from an external system. Furthermore, the timing controller 2 generates RGBW data indicating the brightness of each sub-pixel of the display unit 1 based on the RGB data, which is the input signal from the external system, and outputs the RGBW data as an output signal to multiple source drive ICs 3. Note that the number of source drive ICs 3 and gate drive ICs 4 is not limited to those shown in the illustration. Each of the multiple source drive ICs 3 supplies voltage (video signals) to drive multiple pixels in the display unit 1 via multiple data lines, in accordance with the control of the timing controller 2. Each of the multiple gate drive ICs 4 supplies scan signals to multiple pixels in the display unit 1 via multiple gate lines, in accordance with the control of the timing controller 2. In this way, the timing controller 2 functions as a display control device that controls the operation of the entire display device. In the following explanation, the directions of the two sides defining the display surface of the display unit 1 will be referred to as the X-axis and Y-axis directions, respectively, and the direction perpendicular to the display surface (i.e., perpendicular to the X-Y plane) will be referred to as the Z-axis direction. Figure 2 is an arrangement diagram of pixels 10 and sub-pixels 11, 12, 13, and 14 in the display unit 1 according to this embodiment. The display unit 1 co