WO2019153112A1

WO2019153112A1 - Flexible display device and control method therefor

Info

Publication number: WO2019153112A1
Application number: PCT/CN2018/075385
Authority: WO
Inventors: 张琨
Original assignee: 深圳市柔宇科技有限公司
Priority date: 2018-02-06
Filing date: 2018-02-06
Publication date: 2019-08-15
Also published as: CN111819517A; CN111819517B

Abstract

A flexible display device (100), comprising: a flexible display panel (10) for displaying a picture; a strain detector (30), which is disposed on the flexible display panel (10) and is used for detecting the strain of the flexible display panel (10); and a processor (50) for receiving the strain detected by the strain detector (30), wherein the processor (50) determines a bending parameter value of the flexible display panel (10) according to the strain detected by the strain detector (30). The state of the flexible display panel (10) is monitored by means of the strain detector (30), thereby preventing the flexible display panel (10) from being damaged as a result of overbending, and prolonging the service life of the flexible display device (100).

Description

Flexible display device and control method thereof

Technical field

The present invention relates to the field of display technologies, and in particular, to a flexible display device and a control method thereof.

Background technique

Recently, the flexible display device has a wide application prospect because it can be bent/wound. However, the existing flexible display device cannot effectively detect the bending of the flexible display panel when the flexible display panel is bent, and the user cannot The bending parameter values of the flexible display panel are obtained, and thus, the flexible display panel may be damaged due to excessive bending.

Summary of the invention

In order to solve the above problems, an embodiment of the present invention discloses a flexible display device capable of avoiding excessive bending of a flexible display panel and a control method thereof.

A flexible display device comprising:

Flexible display panel for displaying pictures;

a strain detector disposed on the flexible display panel for detecting strain of the flexible display panel; and

a processor for receiving the strain detected by the strain detector, the processor determining a bending parameter value of the flexible display panel according to the strain detected by the strain detector, and controlling the flexible display panel to display The bending parameter value of the flexible display panel.

Further, the flexible display device further includes a memory for pre-storing a preset bending parameter value of the flexible display panel in a bent state, the processor further configured to determine that the bending parameter value exceeds the When the bending parameter value is preset, the flexible display panel is controlled to display the reminding information.

Further, each preset bending parameter value corresponds to a usage period of one of the flexible display panels.

Further, the flexible display device further includes a counter connected to the processor and the strain detector for counting the number of times of bending of the flexible display panel, and the period of use corresponds to the flexible display panel The number of bends.

Further, the period of use corresponds to the age of the flexible display panel.

Further, the memory pre-stores a fatigue life curve of the flexible display panel, and the processor determines a corresponding preset bending parameter value according to the fatigue life curve and a usage period of the flexible display panel; the bending parameter The value includes a preset bending parameter value corresponding to a usage period in which the flexible display panel is located.

Further, the flexible display device further includes an alarm connected to the processor, when the processor determines that the bending parameter value exceeds a preset bending parameter value corresponding to a use period in which the flexible display panel is located The processor controls the alarm to send an alarm signal to alert the user.

Further, the strain detector includes a piezoelectric polymer material, and the piezoelectric polymer material can generate a corresponding voltage signal according to the magnitude of the force when the flexible display panel is strained, and transmit the voltage signal. And for the processor, the processor acquires a bending parameter value of the flexible display panel according to the voltage signal.

Further, the flexible display panel includes a display layer, and the strain detector is disposed on the display layer.

Further, the flexible display panel further includes a support layer, the support layer being located between the display layer and the strain detector.

Further, the flexible display panel further includes a first optical adhesive layer and a touch layer, and the touch layer is attached to a side of the display layer away from the strain detector through the first optical adhesive layer.

Further, the flexible display panel further includes a polarizer disposed on a side of the display layer away from the strain detector.

Further, the flexible display panel further includes a second optical adhesive layer and a protective cover, and the protective cover is attached to the polarizer through the second optical adhesive layer.

Further, the flexible display panel further includes an ink disposed in an edge region of the second optical adhesive layer.

Further, the flexible display panel displays a bending parameter value of the flexible display panel.

A control method for a flexible display device includes the following steps:

Detecting strain of the flexible display panel of the flexible display device; and

A bending parameter value of the flexible display panel is determined based on the detected strain.

Further, after the determining the bending parameter value of the flexible display panel according to the detected strain and controlling the flexible display panel to display the bending parameter value of the flexible display panel, the control method further includes the following steps :

Comparing a current bending parameter value and a preset bending parameter value of the flexible display panel;

When it is determined that the current bending parameter value of the flexible display panel exceeds the preset bending parameter value, the flexible display panel is controlled to display output reminder information.

Further, a corresponding preset bending parameter value is determined according to a usage period of the flexible display panel.

Further, a corresponding preset bending parameter value is determined according to the fatigue life curve and the use period of the flexible display panel.

Further, the flexible display panel is controlled to display a bending parameter value of the flexible display panel according to the bending parameter value.

The flexible display device and the control method thereof are provided, wherein the strain detector monitors a state of the flexible display panel to feed back a bending parameter value of the flexible display panel to a user, thereby avoiding excessive bending The flexible display panel causes damage and extends the service life of the flexible display device.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

FIG. 1 is a structural block diagram of a flexible display device according to an embodiment of the present invention.

2 is a schematic view of the strain detector and the flexible display panel when bent.

3 is a schematic view of a stress-strain curve of a flexible display panel.

4 is a schematic cross-sectional view of a flexible display device.

FIG. 5 is a cross-sectional view of a flexible display device according to another embodiment.

FIG. 6 is a schematic diagram of a flexible display device according to still another embodiment.

7 is a flow chart of a control method of the flexible display device.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 1 , the present invention provides a flexible display device 100 including a flexible display panel 10 , a strain detector 30 , and a processor 50 . The flexible display panel 10 is for displaying a picture. A strain detector 30 is disposed on the flexible display panel 10 for detecting strain of the flexible display panel 10. The processor 50 is configured to receive the strain detected by the strain detector 30, and the processor 50 determines the bending parameter value of the current flexible display panel 10 according to the strain detected by the strain detector 30. Further, the processor 50 controls the flexible display panel 10 to display the bending parameter values of the flexible display panel 10.

The bending parameter values include parameter values such as a bending radius or a curvature of the flexible display panel 10. In the process of bending the flexible display panel, the strain detector 30 monitors the strain of the bending process of the flexible display panel 10, and the processor 50 determines the bending of the current flexible display panel 10 based on the strain detected by the strain detector 30. The parameter value is controlled, and the flexible display panel 10 is displayed to display the bending parameter value of the flexible display panel 10, thereby enabling the user to obtain the degree of bending of the flexible display panel 10, thereby avoiding damage to the flexible display panel 10 due to excessive bending.

In a specific embodiment, the flexible display device 100 further includes a memory 70 for pre-storing preset bending parameter values of the flexible display panel 10 in a bent state, and the processor 50 acquires flexibility according to the strain detected by the strain detector 30. Displaying the bending parameter value of the panel 10, the processor 50 compares the bending parameter value with the preset bending parameter value, and when the processor 50 determines that the bending parameter value exceeds the preset bending parameter value, the processor 50 further The flexible display panel 10 is controlled to output reminder information to remind the user that the user is currently in an excessively bent state. The reminder information may be preset text, picture, screen flicker, and the like. The preset bending parameter value also includes parameter values such as a bending radius or a curvature of the flexible display panel 10.

Referring to FIG. 2 , the strain detector 30 includes a piezoelectric polymer material capable of generating a corresponding voltage signal according to the magnitude of the force when the flexible display panel 10 is strained, and transmitting the voltage signal. To the processor 50, the processor 50 performs a calculation process according to the voltage signal to obtain a bending parameter value of the flexible display panel 10. In one embodiment, the memory 70 pre-stores a plurality of bending parameter values, each bending parameter value corresponding to a voltage signal generated by the strain detector 30. The piezoelectric polymer material is made of at least one of polyvinylidene fluoride and polyvinyl fluoride. In this embodiment, the bending parameter value is a bending radius. Further, when the piezoelectric polymer material is subjected to stress such as tensile force or pressure, the surface of the piezoelectric polymer material generates a charge Q=d*F, where d is a piezoelectric constant, and the piezoelectric polymer material A voltage signal is generated based on the charge generated by the force.

Please refer to FIG. 3, which is a stress-strain curve of the flexible display panel 10 during a certain period of use. If the applied stress is equal to or less than the yield stress Y, the flexible display panel 10 is elastically deformed, in other words, the flexible display panel 10 returns to its original shape after the force is removed. On the other hand, if the applied stress is greater than the yield stress Y and smaller than the maximum stress U, the flexible display panel 10 is plastically deformed (when the stress is sufficient to permanently deform the object), in other words, after the force is removed by the flexible display panel 10, The flexible display panel 10 is still deformed without returning to its original shape. When the tension is continuously applied even after the maximum stress is reached, although the tension is reduced, the easily affected portion of the flexible display panel 10 is extended, and then cracks eventually occur and are damaged.

Since the flexible display panel 10 has mechanical fatigue and corresponds to different yield stresses in different use periods, the memory 70 pre-stores a plurality of preset bending parameter values, and each of the preset bending parameter values corresponds to a use period of the flexible display panel 10. In this embodiment, the preset bending parameter value is an optimal bending radius in a use period in which the flexible display panel 10 is located. It can be understood that the preset bending parameter value is an optimal curvature or the like in the use period in which the flexible display panel 10 is located.

The use period includes a first use period, a second use period, a third use period, an Nth use period, for example, the flexible display panel 10 has a yield stress corresponding to σ1 in the first use period, and the flexible display panel The yield stress corresponding to the second use period is σ2, and the yield stress corresponding to the flexible display panel 10 in the Nth use period is σN. Generally, as the flexible display panel 10 is used for a longer period of time, its yield stress becomes smaller and smaller, in other words, σ1>σ2...>σN. The period of use may be defined as the flexible display panel 10 after a certain period of use, for example, the first period of use is the first year of use, the second period of use is the second year of use... the Nth period of use is the first year of use period.

In one embodiment, the period of use is defined as the number of stress cycles of the flexible display panel 10 to increase the control accuracy. In other words, the number of stress cycles of the flexible display panel 10 under stress is the number of bends of the flexible display panel 10. example, the first period of use of the number of stress cycles between 0 ~ N _1, the second period is the use of stress cycles in the period between the use of the N-th ...... ₂ N ₁ ~ N is a number of stress cycles in _{N N-1} ~ Between N _N. The flexible display device 100 further includes a counter coupled to the processor 50 and the strain detector 30 for counting the number of bends of the flexible display panel 10.

In an embodiment, the memory 70 pre-stores the fatigue life curve of the flexible display panel 10, and the processor 50 determines a corresponding preset bending parameter value according to the fatigue life curve and the use period of the flexible display panel 10; the processor 50 It is also used to control the preset bending parameter value corresponding to the use period in which the flexible display panel 10 is displayed, to feedback the preset bending parameter value of the corresponding flexible display panel 10 to the user according to different usage periods in which the flexible display panel 10 is located. To prevent excessive bending of the flexible display panel 10. In the present embodiment, the fatigue life curve may be a curve formed by a change in the yield stress of the flexible display panel 10 as a function of the number of stress cycles.

Further, the flexible display device 100 further includes an alarm 90 connected to the processor 50. When the processor 50 determines that the bending parameter value exceeds a preset bending parameter value corresponding to the use period in which the flexible display panel 10 is located, the processor The alarm 90 is controlled to issue an alarm signal to alert the user. The alarm 90 can be an audio device, and the alarm signal is a sound emitted by the audio device. It can be understood that the alarm 90 can be a vibration motor, and the alarm signal is vibration.

Further, referring to FIG. 4 , the flexible display panel 10 includes a display layer 11 and a support layer 13 . The support layer 13 is located between the display layer 11 and the strain detector 30. In this embodiment, the display layer is an OLED layer.

The flexible display panel 10 further includes a first optical adhesive layer 15 and a touch layer 17 . The touch layer 17 is attached to the side of the display layer 11 away from the strain detector 30 through the first optical adhesive layer 15 to provide a touch input function. .

The flexible display panel 10 further includes a polarizer 19, and the polarizer 19 is disposed on a side of the display layer away from the strain detector 30.

The flexible display panel 10 further includes a second optical adhesive layer 21 and a protective cover 23 attached to the polarizer 19 via the second optical adhesive layer 21.

The flexible display panel 10 further includes an ink 25 disposed in an edge region of the second optical adhesive layer 21.

In an embodiment, referring to FIG. 5, the flexible display panel 10 may omit the support layer 13, the strain detector 30 is disposed on the display layer 11, and the strain detector 30 is made of a piezoelectric polymer material, which may also serve as a display layer. The support material of 11 has the function of supporting layer at the same time, and the piezoelectric polymer material itself has better optical characteristics and bending characteristics, so that it can replace the traditional single function supporting material.

It can be understood that, referring to FIG. 6, the flexible display panel 10 can include two or more bendable regions 101, each bendable region 101 is provided with at least one strain detector 30, and the strain detector 30 is used for detecting The strain in the bendable region 101 is located and the detected strain is transmitted to the processor 50. Since the flexible display panel 10 has mechanical fatigue, and some of the bendable regions 101 are often bent, for example, the bendable region 101 located in the central portion of the flexible panel 10, each bendable region 101 corresponds to a different use period. The memory 70 pre-stores a plurality of preset bending parameter values corresponding to each of the bendable regions 101, and each of the preset bending parameter values corresponds to a use period of the flexible display panel 10. In a certain period of use in which the flexible display panel 10 is located, the preset bending parameter value corresponding to each bendable region 101 is an optimal bending radius in the certain use period, and the use period is The use time of the flexible display device 100.

It will be appreciated that the strain detector 30 may be a sensor that measures strain based on the principle that the wire elastically extends when an external force is applied by the wire.

Referring to FIG. 7, the present invention further provides a control method of the above flexible display device 100, which includes the following steps:

S1, detecting the strain of the flexible display panel 10 of the flexible display device 100.

The strain of the flexible display panel 10 of the flexible display device 100 is detected by the strain detector 30 of the flexible display device 100.

S2, determining a bending parameter value of the flexible display panel 10 according to the detected strain.

Wherein, the step S2 is to receive the strain detected by the strain detector 30 through the processor 50 of the flexible display device 100, and the processor 50 determines the bending parameter value of the flexible display panel 10 according to the strain detected by the strain detector 30, and The flexible display panel 10 is controlled to display the bending parameter values of the flexible display panel 10. Further, determining the bending parameter value of the flexible display panel 10 according to the detected strain controls the flexible display panel 10 to display the bending parameter value of the flexible display panel 10.

S3. Compare the current bending parameter value and the preset bending parameter value of the flexible display panel 10.

Comparing the bending parameter value of the flexible display panel 10 with the preset bending parameter value pre-stored by the memory 70 of the flexible display device 100 by the processor 50, the processor 50 determines whether the bending parameter value of the current flexible display panel 10 exceeds the value. Preset the bending parameter value.

S4. When it is determined that the current bending parameter value of the flexible display panel 10 exceeds the preset bending parameter value, the flexible display panel 10 is controlled to display output reminder information.

When the processor 50 determines that the bending parameter value exceeds the preset bending parameter value, the processor 50 controls the flexible display panel 10 to display the bending parameter value and the reminder information.

When the user observes the reminder information, the bending deformation of the flexible display device 100 is stopped, and the flexible display device 100 is returned to the safe state. Since the strain detector 30 detects the bending parameter value of the flexible display panel 10 in real time and transmits it to the processor 50, when processing When the controller 50 determines that the bending parameter value does not exceed the preset bending parameter value, the processor 50 controls the flexible display panel 10 to stop outputting the reminder information.

In an embodiment, the memory 70 pre-stores a fatigue life curve, and the processor 50 determines a corresponding preset bending parameter value according to the fatigue life curve and the usage period of the flexible display panel 10, and the processor 50 further controls the flexible display panel. The preset bending parameter values corresponding to the use period are displayed to feed back the preset bending parameter values of the corresponding flexible display panel 10 to the user according to different usage periods in which the flexible display panel 10 is located, thereby preventing the flexible display panel 10 from being pressed against the flexible display panel 10 . Excessive bending. The fatigue life curve may be a curve formed by the change in the yield stress of the flexible display panel 10 as a function of the number of stress cycles.

The flexible display device 100 and the control method thereof are provided. The strain detector 30 monitors the state of the flexible display panel 10, and the processor 50 controls the flexible display panel 10 to display the bending parameter value according to the strain detected by the strain detector 30. In order to feed back the bending parameter value of the flexible display panel 10 to the user, thereby avoiding damage to the flexible display panel 10 due to excessive bending, the service life of the flexible display device 100 is prolonged. In addition, the flexible display device 100 feeds back the corresponding preset bending parameter values to the user during different use periods, further avoiding damage to the flexible display panel 10 due to excessive bending.

The control method of the flexible display device 100 provided by the present invention may be implemented in hardware or firmware, or may be software or computer code that can be stored in a recording medium such as a CD, a ROM, a RAM, a floppy disk, a hard disk, or a magneto-optical disk, or As computer code originally stored on a remote recording medium or a non-transitory machine readable medium, downloaded over a network and stored in a local recording medium, the methods described herein may utilize a general purpose computer or special processor or in, for example, an ASIC or FPGA. Programmable or dedicated hardware such as is presented in software stored on a recording medium. As can be appreciated in the art, a computer, processor, microprocessor, controller or programmable hardware includes a memory component, such as RAM, ROM, flash memory, etc., when a computer, processor or hardware implements the processing methods described herein. The memory component can store or receive software or computer code when the software or computer code is taken and executed. In addition, when a general purpose computer accesses code for implementing the processing shown herein, the execution of the code converts the general purpose computer into a special purpose computer for performing the processing shown herein.

The above is a preferred embodiment of the present invention, and it should be noted that those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. It is the scope of protection of the present invention.

Claims

A flexible display device, comprising:

Flexible display panel for displaying pictures;

a strain detector disposed on the flexible display panel for detecting strain of the flexible display panel; and

a processor for receiving the strain detected by the strain detector, the processor determining a bending parameter value of the flexible display panel according to the strain detected by the strain detector.
The flexible display device according to claim 1, wherein the flexible display device further comprises a memory for pre-preserving a preset bending parameter value of the flexible display panel in a bent state, the processor further And configured to control the flexible display panel to display reminding information when determining that the bending parameter value exceeds the preset bending parameter value.
The flexible display device according to claim 2, wherein each of the preset bending parameter values corresponds to a use period of the flexible display panel.
The flexible display device according to claim 3, wherein the flexible display device further comprises a counter connected to the processor and the strain detector for performing a bending number of the flexible display panel Counting, the period of use corresponds to the number of bends of the flexible display panel.
The flexible display device of claim 3, wherein the period of use corresponds to a useful life of the flexible display panel.
The flexible display device according to claim 3, wherein the memory pre-stores a fatigue life curve of the flexible display panel, and the processor determines the fatigue life curve and the use period of the flexible display panel Corresponding preset bending parameter values; the bending parameter values include preset bending parameter values corresponding to the use period in which the flexible display panel is located.
The flexible display device of claim 3, wherein the flexible display device further comprises an alarm coupled to the processor, the processor determining that the bending parameter value exceeds the flexible display panel When the usage period corresponds to the preset bending parameter value, the processor controls the alarm to send an alarm signal to remind the user.
The flexible display device according to claim 1, wherein the strain detector comprises a piezoelectric polymer material, and the piezoelectric polymer material can generate a force according to a force when the flexible display panel is strained. Corresponding voltage signal is transmitted to the processor, and the processor acquires a bending parameter value of the flexible display panel according to the voltage signal.
The flexible display device of claim 1, wherein the flexible display panel comprises a display layer, and the strain detector is disposed on the display layer.
The flexible display device of claim 9, wherein the flexible display panel further comprises a support layer, the support layer being located between the display layer and the strain detector.
The flexible display device of claim 9, wherein the flexible display panel further comprises a first optical adhesive layer and a touch layer, wherein the touch layer is attached to the The display layer is remote from the side of the strain detector.
The flexible display device according to claim 9, wherein the flexible display panel further comprises a polarizer, and the polarizer is disposed on a side of the display layer away from the strain detector.
The flexible display device of claim 12, wherein the flexible display panel further comprises a second optical adhesive layer and a protective cover, wherein the protective cover is attached to the On the polarizer.
The flexible display device of claim 13, wherein the flexible display panel further comprises an ink disposed in an edge region of the second optical adhesive layer.
The flexible display device of claim 1, wherein the flexible display panel displays a bending parameter value of the flexible display panel.
A control method of a flexible display device, characterized in that the control method comprises the following steps:

Detecting strain of the flexible display panel of the flexible display device; and

A bending parameter value of the flexible display panel is determined based on the detected strain.
The control method according to claim 16, wherein said "determining a bending parameter value of said flexible display panel according to the detected strain, and controlling said flexible display panel to display a bending parameter value of said flexible display panel After that, the control method further includes the following steps:

Comparing a current bending parameter value and a preset bending parameter value of the flexible display panel;

When it is determined that the current bending parameter value of the flexible display panel exceeds the preset bending parameter value, the flexible display panel is controlled to display output reminder information.
The control method according to claim 17, wherein the corresponding preset bending parameter value is determined according to the use period of the flexible display panel.
The control method according to claim 18, wherein the corresponding preset bending parameter value is determined according to the fatigue life curve and the use period of the flexible display panel.
The control method according to claim 16, wherein the flexible display panel is configured to display a bending parameter value of the flexible display panel according to the bending parameter value.