CN111694455A - Display panel and display device thereof - Google Patents
Display panel and display device thereof Download PDFInfo
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- CN111694455A CN111694455A CN201910197453.0A CN201910197453A CN111694455A CN 111694455 A CN111694455 A CN 111694455A CN 201910197453 A CN201910197453 A CN 201910197453A CN 111694455 A CN111694455 A CN 111694455A
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- display panel
- piezoelectric element
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- 239000010410 layer Substances 0.000 claims abstract description 55
- 238000005452 bending Methods 0.000 claims abstract description 24
- 239000000758 substrate Substances 0.000 claims abstract description 21
- 239000002346 layers by function Substances 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000005538 encapsulation Methods 0.000 claims abstract description 3
- 230000007935 neutral effect Effects 0.000 claims description 14
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- 238000000151 deposition Methods 0.000 claims description 4
- 238000005240 physical vapour deposition Methods 0.000 claims description 4
- 238000005229 chemical vapour deposition Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 5
- 230000006870 function Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000013507 mapping Methods 0.000 description 4
- 229910002056 binary alloy Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005525 hole transport Effects 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229920001621 AMOLED Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 238000007738 vacuum evaporation Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
Abstract
The invention relates to a display panel and a display device thereof, wherein the display panel comprises: a substrate base plate; the TFT array layer is formed on the substrate base plate; an organic functional layer formed on the TFT array layer; an encapsulation layer formed on the organic functional layer; and the piezoelectric element is arranged between the substrate base plate and the TFT array layer, or between the TFT array layer and the organic functional layer, or in at least one TFT in the TFT array layer. The invention integrates the pressure sensing element into the display panel of the display device, saves the volume of the display device, can detect whether the display device is folded or not and the bending angle of the display device in the folding process when the display device is folded, further realizes more display picture control according to the detection of the bending angle and enriches the functions of the display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a display device thereof.
Background
With the rapid development of electronic technology, the functions of mobile terminals are becoming more and more powerful, and the larger the screen of the mobile terminal is, in order to realize portable carrying of the mobile terminal, mobile phone manufacturers have been pushing out foldable mobile devices one by one, and the mobile devices can be unfolded to become flat boards, and can become mobile phones after being folded, and the display content and display of the display screen of the mobile device correspond to the folding state of the mobile terminal.
In the related art, a sensing element for detecting whether a mobile terminal is folded or not is generally disposed in a mechanism of the mobile terminal, but a certain space is required to add a sensing element, which causes a volume of the mechanism of the mobile terminal to increase, thereby increasing the volume of the mobile terminal. In the prior art, a technology of integrating a pressure-sensitive element into a display panel also exists, but the technical problem of touch control of the display panel is solved by integrating the pressure-sensitive element into the display panel in the prior art, so that the display device achieves the purpose of touch control and improves the touch sensitivity of the display panel, and the folding and bending angles of the display device in the folding process cannot be detected. Therefore, there is a need to provide a new technical solution to improve one or more of the problems in the above solutions.
It is noted that this section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Disclosure of Invention
An object of the present invention is to provide a display panel and a display device thereof, which overcome one or more of the problems due to the limitations and disadvantages of the related art, at least to some extent.
According to a first aspect of the embodiments, there is provided a display panel comprising:
a substrate base plate;
a TFT array layer formed on the substrate;
an organic functional layer formed on the TFT array layer;
an encapsulation layer formed on the organic functional layer;
the piezoelectric element is arranged between the substrate base plate and the TFT array layer, or between the TFT array layer and the organic functional layer, or in at least one TFT in the TFT array layer; wherein the piezoelectric element outputs corresponding different electrical signals at different bending angles when the display panel is folded.
In an embodiment of the present invention, the position of the piezoelectric element is determined by a neutral layer of the display panel.
In an embodiment of the present invention, the piezoelectric element includes a first piezoelectric element and a second piezoelectric element, and the first piezoelectric element and the second piezoelectric element are respectively located on two sides of a neutral layer of the display panel.
In an embodiment of the present invention, the piezoelectric element is made of a piezoelectric ceramic material.
In an embodiment of the present invention, the piezoelectric element is formed by a physical vapor deposition process or a chemical vapor deposition process.
In the embodiment of the invention, the temperature for forming the piezoelectric element by deposition crystallization is 400-600 ℃.
In a second aspect of the embodiments of the present invention, a display device is provided, which includes the display panel according to any one of the embodiments.
In an embodiment of the present invention, the display device further includes a controller;
the piezoelectric element is used for outputting corresponding different electric signals when the bending angle of the display panel changes;
the controller is electrically connected with the piezoelectric element and used for controlling the display screen of the display panel to change according to the different electric signals.
In an embodiment of the invention, the controller is specifically configured to control the display panel to convert a current first display image into a bent second display image according to a corresponding preset electrical signal output when the display panel is bent to a preset angle.
In an embodiment of the invention, the first display screen is a full screen displayed before being bent, and the second display screen is a full screen reduced after being bent.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
the invention integrates the pressure sensing element into the display panel of the display device, saves the volume of the display device, can detect whether the display device is folded or not and the bending angle of the display device in the folding process when the display device is folded, further realizes more display picture control according to the detection of the bending angle and enriches the functions of the display device.
Drawings
FIGS. 1A-1C show a display panel structure diagram of various embodiments of the present invention;
FIG. 2 is a schematic diagram of a neutral layer of a display panel according to an embodiment of the invention when the display panel is bent;
fig. 3 is a schematic diagram illustrating a display screen change in a folding process of the display device according to the embodiment of the invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. Some of the block diagrams shown in the figures are functional entities and do not necessarily correspond to physically or logically separate entities.
An embodiment of the present invention provides a display panel, as shown in fig. 1A to 1C, the display panel includes: a base substrate 1; a TFT array layer 2 formed on the substrate 1; an organic functional layer 3 formed on the TFT array layer 2; a sealing layer 4 formed on the organic functional layer 3; a piezoelectric element 5 disposed between the substrate 1 and the TFT array layer 2, or disposed between the TFT array layer 2 and the organic functional layer 3, or disposed in at least one TFT in the TFT array layer 2; wherein the piezoelectric element 5 outputs corresponding different electrical signals at different bending angles when the display panel is folded.
In the above embodiment of the present invention, when the display panel is folded, the piezoelectric element outputs different corresponding electrical signals at different bending angles when the display panel is folded, so that not only can the detection of whether the display device is folded be realized, but also the detection of the bending angle of the display device during the folding process can be realized, and further more display picture control can be realized according to the detection of the bending angle, thereby enriching the functions of the display device.
Specifically, the substrate 1 may be a flexible substrate, and the substrate 1 may at least include a first electrode layer and a pixel defining layer; the organic functional layer 3 may include at least one or a combination of plural kinds of organic light emitting layers, hole injection layers, hole transport layers, electron injection layers, and the like. For example, in the organic functional layer 3, an anode, a hole injection layer, a hole transport layer, an organic light emitting layer, an electron transport layer, an electron injection layer, and a cathode are stacked in this order. For example, the organic functional layer 3 may be provided with an electron blocking layer and a hole blocking layer, but is not limited thereto. The formation of the TFT array layer 2 may be formed by, for example, a physical vapor deposition process, which may be referred to in the prior art. When the piezoelectric element 5 is arranged between the substrate base plate 1 and the TFT array layer 2, the opening area of the pixel defining layer on the substrate base plate 1 can not be provided with the piezoelectric element 5 material; when the piezoelectric element 5 is disposed between the TFT array layer 2 and the organic functional layer 3, the material of the piezoelectric element 5 cannot be disposed in the conductive region between the TFT array layer 2 and the organic functional layer 3.
In the embodiment of the present invention, as shown in fig. 2, the position of the piezoelectric element 5 is determined by the neutral layer 6 of the display panel. Under the condition of plane bending and oblique bending of the display panel, the normal stress value of each point on the intersection line of the cross section and the stress plane is zero, the intersection line is called a neutral axis, the plane formed by the neutral axes of all the cross sections is called a neutral layer, and the neutral layer is the interface of the stretching area and the compression area.
Optionally, in an embodiment of the present invention, the piezoelectric element 5 includes a first piezoelectric element and a second piezoelectric element, and the first piezoelectric element and the second piezoelectric element are respectively located on two sides of the neutral layer 6 of the display panel. For example, the first piezoelectric element is a piezoelectric element for detecting tensile stress and the second piezoelectric element is a piezoelectric element for detecting compressive stress, or the first piezoelectric element is a piezoelectric element for detecting compressive stress and the second piezoelectric element is a piezoelectric element for detecting tensile stress. The piezoelectric element for detecting the tensile stress is positioned on the side of the neutral layer 6 of the display panel where the tensile stress is larger, and the piezoelectric element for detecting the compressive stress is positioned on the side of the neutral layer 6 of the display panel where the compressive stress is larger. When the display panel is bent, the piezoelectric elements on the two sides of the neutral layer release current signals with different magnitudes under the condition of different magnitudes of stress, so that the bending angle of the display panel can be detected relatively accurately.
In the embodiment of the present invention, the piezoelectric element 5 is made of a piezoelectric ceramic material. The piezoelectric ceramic is a functional ceramic material capable of mutually converting mechanical energy and electric energy, and belongs to an inorganic non-metallic material. The piezoelectric ceramics have sensitive characteristics, can convert extremely weak mechanical vibration into an electric signal, and commonly used piezoelectric ceramics comprise a barium titanate binary system and a lead zirconate titanate binary system, and a third ABO3(A represents divalent metal ions, B represents tetravalent metal ions or the sum of several ions is positive tetravalent) type compound added into the binary system, such as: a ternary system consisting of Pb (Mn1/3Nb2/3) O3, Pb (Co1/3Nb2/3) O3 and the like.
In the embodiment of the present invention, the piezoelectric element 5 is formed by a physical vapor deposition process or a chemical vapor deposition process. For example, a process such as vacuum evaporation or sputtering may be used, but the process is not limited thereto.
In the embodiment of the present invention, the temperature for forming the piezoelectric element 5 by deposition crystallization is 400-600 ℃. The piezoelectric material should be crystallized at a high temperature of 400 c or more, but if the temperature is excessively high, damage may be caused to the substrate material, for example, when the piezoelectric element 5 is disposed between the above-mentioned substrate 1 and the TFT array layer 2, the substrate may be damaged by the excessively high temperature during the crystallization of the piezoelectric material. When the temperature is 400-600 ℃, the deposition crystallization of the piezoelectric material can be ensured, and the damage of the substrate material caused by high temperature can be reduced.
In an embodiment of the invention, when the display panel is folded, the piezoelectric elements disposed inside the display panel generate current signals after receiving a compressive stress or a tensile stress during the folding process of the display panel, and the bending angles are different and the current signals generated by the piezoelectric elements are also different, so as to detect whether the display panel is folded and the angle change during the folding process.
An embodiment of the present invention further provides a display device, including the display panel according to any one of the above embodiments. The display device may include, but is not limited to, an AMOLED display panel, a PMOLED display panel, or a flexible display panel.
In an embodiment of the invention, the display device may further include a controller, and the controller may be integrated in a driving chip of the display panel, but is not limited thereto. The piezoelectric element 5 is configured to output different corresponding electrical signals when the bending angle of the display panel changes. The controller is electrically connected to the piezoelectric element 5, and is configured to control a change of a display screen of the display panel according to the different electrical signals. For example, when the display device is bent, the piezoelectric element 5 emits a current signal, and the larger the bending angle is, the larger the current signal emitted by the piezoelectric element 5 is, and the control panel controls the picture change of the display panel according to the received current signal of the piezoelectric element.
For example, a mapping lookup table between the current signals with different magnitudes and the bending angles of the corresponding display panels may be determined in advance through experiments, and the mapping lookup table may be stored in the controller or a memory connected to the controller, so that the controller may determine the bending angles according to the mapping lookup table.
In an embodiment of the invention, the controller may be specifically configured to control the display panel to convert a current first display image into a bent second display image according to a corresponding preset electrical signal output when the display panel is bent to a preset angle.
For example, in an embodiment of the present invention, as shown in fig. 3, the first display screen may be a full-screen displayed before being bent, and the second display screen may be a full-screen reduced after being bent. Of course, the display control in the present embodiment is not limited thereto.
For example, when the display device is bent to, for example, 90 °, the piezoelectric element 5 sends a certain current signal, the controller searches the mapping relation lookup table according to the magnitude of the certain current signal to determine that the bending angle is 90 °, and then the display panel can be controlled to switch from the full-screen display image to the bent partial screen to display the full-screen display image, which is not limited to this.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (10)
1. A display panel, comprising:
a substrate base plate;
the TFT array layer is formed on the substrate base plate;
an organic functional layer formed on the TFT array layer;
an encapsulation layer formed on the organic functional layer;
the piezoelectric element is arranged between the substrate base plate and the TFT array layer, or between the TFT array layer and the organic functional layer, or in at least one TFT in the TFT array layer; wherein the piezoelectric element outputs corresponding different electrical signals at different bending angles when the display panel is folded.
2. The display panel according to claim 1, wherein a position where the piezoelectric element is provided is determined by a neutral layer of the display panel.
3. The display panel according to claim 2, wherein the piezoelectric elements include a first piezoelectric element and a second piezoelectric element, and the first piezoelectric element and the second piezoelectric element are respectively located on both sides of a neutral layer of the display panel.
4. The display panel according to any one of claims 1 to 3, wherein the piezoelectric element is made of a piezoelectric ceramic material.
5. The display panel according to claim 4, wherein the piezoelectric element is formed by a physical vapor deposition process or a chemical vapor deposition process.
6. The display panel of claim 5, wherein the temperature for depositing the crystals to form the piezoelectric element is 400-600 ℃.
7. A display device comprising the display panel according to any one of claims 1 to 6.
8. The display device of claim 7, wherein the display device further comprises a controller;
the piezoelectric element is used for outputting corresponding different electric signals when the bending angle of the display panel changes;
and the controller is electrically connected with the piezoelectric element and used for controlling the display picture change of the display panel according to the different electric signals.
9. The display device according to claim 8, wherein the controller is specifically configured to control the display panel to convert a current first display frame into a bent second display frame according to a corresponding preset electrical signal output when the display panel is bent to a preset angle.
10. The display device according to claim 9, wherein the first display screen is a full screen displayed before bending, and the second display screen is the full screen reduced after bending.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910197453.0A CN111694455A (en) | 2019-03-15 | 2019-03-15 | Display panel and display device thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910197453.0A CN111694455A (en) | 2019-03-15 | 2019-03-15 | Display panel and display device thereof |
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| CN111694455A true CN111694455A (en) | 2020-09-22 |
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| CN109448634A (en) * | 2018-11-13 | 2019-03-08 | 武汉华星光电半导体显示技术有限公司 | The display control method of display device and display device |
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