CN108231825B - Display screen and mobile terminal - Google Patents
Display screen and mobile terminal Download PDFInfo
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- CN108231825B CN108231825B CN201611230845.5A CN201611230845A CN108231825B CN 108231825 B CN108231825 B CN 108231825B CN 201611230845 A CN201611230845 A CN 201611230845A CN 108231825 B CN108231825 B CN 108231825B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/88—Dummy elements, i.e. elements having non-functional features
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/124—Insulating layers formed between TFT elements and OLED elements
Abstract
The invention provides a display screen and a mobile terminal, wherein the display screen comprises a flexible substrate, a first flexible electrode layer deposited on the flexible substrate; the elastic insulating medium layer is deposited on the first flexible electrode layer, and the second flexible electrode layer is deposited on the elastic insulating medium layer; the display device further comprises a light-emitting display layer arranged on the second flexible electrode layer; the first flexible electrode layer, the elastic insulating medium layer and the second flexible electrode layer form a pressure-sensitive capacitor. In the above example, the light-emitting display layer and the pressure-sensitive capacitor are stacked on the same substrate, and the pressure-sensitive capacitor is directly formed on the substrate in a deposition mode during manufacturing, so that connection can be realized without using an adhesive layer, and when the pressure-sensitive capacitor is applied to a mobile terminal, the situation that the substrate is separated from the pressure-sensitive capacitor due to multiple bending is reduced, and the stability of the whole display screen is improved.
Description
Technical Field
The application relates to the technical field of display screens, in particular to a display screen and a mobile terminal.
Background
Mobile terminals such as mobile phones have a flexible folding function, and are the leading product design field after the current market is in fear. The switching of displaying physical dimensions can be realized through the bent mobile phone, the cool and dazzling development design based on the bent mobile phone is met, and some excellent user experiences such as non-touch page turning reading, web browsing and game operation are realized, so that the market competitiveness of mobile phone products is improved.
In order to monitor and output the bending times and the bending radius of the bendable mobile terminal, a sensing device is generally installed on the rotating shaft, and the bending parameters of the terminal device are obtained through the rotating signal of the rotating shaft based on the relationship between the rotation of the rotating shaft and the bending radius. The general method can obtain accurate bending parameters, but because the sensing equipment of the general method occupies a certain space, the optimal design of the whole structure is limited. In another method, the pressure sensing layer can be attached to the flexible display screen to obtain the corresponding relation between the pressure variable and the bending radius.
As shown in fig. 1, fig. 1 shows a setting mode of a pressure sensor in the prior art, the pressure sensor is attached to the lower surface of a display module (1 is a display module, 2 is a middle frame, and 3 is a pressure sensor), a gap between an electrode and a metal middle frame in the pressure sensing is a dielectric layer of a capacitor, when the display module is pressed, the gap between the pressure sensing electrode and the metal middle frame is reduced, the capacitor is changed, and thus, the change of the pressure can be obtained through the change of the capacitor.
The prior art has the following disadvantages: pressure-sensitive and display module assembly are two independent devices, and the centre needs to have the adhesive linkage, and whole thickness is thicker, when using this kind of technical scheme to flexible terminal, along with the increase of bending angle and number of times, the adhesive linkage is easily peeled off, and the increase of thickness has restricted the promotion of bending ability.
Disclosure of Invention
The embodiment of the application provides a display screen and a mobile terminal, and the following effect of a pressure sensing device when the display screen is bent is improved, and then the detection effect of the mobile terminal when the display screen is bent is improved.
The embodiment of the application provides a display screen, which comprises a flexible substrate, a first flexible electrode layer deposited on the flexible substrate; the elastic insulating medium layer is deposited on the first flexible electrode layer, and the second flexible electrode layer is deposited on the elastic insulating medium layer; the display device further comprises a light-emitting display layer arranged on the second flexible electrode layer; the first flexible electrode layer, the elastic insulating medium layer and the second flexible electrode layer form a pressure-sensitive capacitor.
In the above example, the light-emitting display layer and the pressure-sensitive capacitor are stacked on the same substrate, and the pressure-sensitive capacitor is directly formed on the substrate in a deposition mode during manufacturing, so that connection can be realized without using an adhesive layer, and when the pressure-sensitive capacitor is applied to a mobile terminal, the situation that the substrate is separated from the pressure-sensitive capacitor due to multiple bending is reduced, and the stability of the whole display screen is improved.
In a specific embodiment, a buffer layer is disposed between the light emitting display layer and the second flexible electrode layer. The buffer layer through setting up has improved the atress effect of display screen when buckling.
In a specific embodiment, the buffer layer includes a silicon nitride layer and a silicon oxide layer which are stacked. Has good buffering effect.
In a specific embodiment, the light emitting display layer includes a driving circuit and an organic light emitting diode connected to the driving circuit. Specifically, the light emitting display layer comprises a driving circuit, an Organic Light Emitting Diode (OLED) and a Thin Film package, wherein the driving circuit (TFT) is made of one of P-type Low Temperature Polysilicon (LTPS), N-type LTPS or Indium Gallium Zinc Oxide (IGZO); the OLED consists of red, green and blue pixels; the thin film package is composed of an inorganic layer (SiNxOx) and a silicon-containing organic layer.
In a specific embodiment, the flexible substrate is a glass substrate or a plastic substrate.
In a specific embodiment, the elastic insulating medium layer is a medium layer made of a pressure-sensitive elastomer material.
In a particular embodiment, the pressure-sensitive elastomeric material comprises: polydimethylsiloxane, polyurethane elastomers or silicone rubber.
In a specific embodiment, the first flexible electrode layer and the second flexible electrode layer are both made of indium tin oxide, zinc oxide and silver nanowires.
When the flexible substrate is manufactured specifically, the thickness of the flexible substrate is between 10 and 50 um.
The embodiment of the application further provides a mobile terminal, which comprises the display screen, wherein the display screen is formed by any one of the first frame body and the second frame body, the first frame body and the second frame body are hinged through a rotating shaft, and the display screen is arranged in a middle frame surrounded by the first frame body and the second frame body.
In a specific embodiment, the processing chip in the mobile terminal is configured to determine a bending angle of the first frame body relative to the second frame body according to a capacitance change of a pressure-sensitive capacitor in the display screen when the first frame body and the second frame body are bent through the rotating shaft.
In a specific embodiment, the processing chip is further configured to execute a set control operation when the bending angle of the mobile terminal exceeds a set value.
Drawings
FIG. 1 is a schematic diagram of a prior art device;
FIG. 2 is a cross-sectional view of a display screen provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention;
fig. 4 is a schematic view of an external bending of a mobile terminal according to an embodiment of the present invention;
FIG. 5 is a schematic view of an outer bend of a display screen according to an embodiment of the present invention;
fig. 6 is a schematic view of a bending angle of a mobile terminal according to an embodiment of the present invention;
fig. 7 is a schematic view of an inner bend of a mobile terminal according to an embodiment of the present invention;
fig. 8 is a schematic view of an inner bend of a display screen according to an embodiment of the present invention.
Reference numerals:
1-display module 2-middle frame 3-pressure sensor
10-flexible substrate 20-first flexible electrode layer 30-elastic insulating medium layer
40-second flexible electrode layer 50-buffer layer 60-light emitting display layer
100-display screen 200-middle frame 201-first frame 202-second frame
300-rotating shaft
Detailed Description
The present application will now be described with reference to the accompanying drawings.
As shown in fig. 2, fig. 2 shows a structure of a display screen provided by an embodiment of the present invention.
The embodiment of the invention provides a display screen, which comprises a flexible substrate 10, a first flexible electrode layer 20 deposited on the flexible substrate 10; an elastic insulating medium layer 30 deposited on the first flexible electrode layer 20, a second flexible electrode layer 40 deposited on the elastic insulating medium layer 30; further comprising a light emitting display layer 60 disposed on the second flexible electrode layer 40; the first flexible electrode layer 20, the elastic insulating medium layer 30 and the second flexible electrode layer 40 form a pressure-sensitive capacitor.
With reference to fig. 2, the display screen provided in this embodiment is a flexible display screen, and the display screen integrates a capacitive pressure sensor (pressure sensing capacitor), the capacitive pressure sensor is composed of a first flexible electrode layer 20, an elastic insulating dielectric layer 30 and a second flexible electrode layer 40, and the first flexible electrode layer 20, the elastic insulating dielectric layer 30 and the second flexible electrode layer 40 are sequentially deposited on a flexible substrate 10, as an optional scheme, a buffer layer 50 is deposited on the capacitive pressure sensor, and a Light emitting display layer 60 is prepared on the buffer layer 50, where the Light emitting display layer 60 is an active matrix Organic Light-emitting diode (AMOLED), that is, in the technical scheme of the present application, a display module and the capacitive pressure sensor are prepared on the same flexible substrate 10 together, so that when the display screen is bent, the capacitive pressure sensor and the display module can not be separated, so that the stability of the whole display screen is improved, and the accuracy of measuring the bending angle of the terminal when the capacitive pressure sensor is applied to a mobile terminal is improved.
In the following, a detailed description is given to the display screen provided in this embodiment with reference to fig. 2, the flexible substrate 10 provided in this embodiment is a substrate made of ultrathin bendable glass or plastic material, such as Polyimide (PI), but it should be understood that the substrate provided in this embodiment can also be made of any other material with flexible performance, in a specific manufacturing scheme, the thickness of the flexible substrate 10 is 10-50um, such as 10um, 20um, 30um, 40um, 50um, and the like, which is arbitrarily between 10-50 um.
The capacitive pressure sensor provided in this embodiment includes two electrode layers, which are a first flexible electrode layer 20 and a second flexible electrode layer 40, respectively, and when the capacitive pressure sensor is specifically manufactured, both the first flexible electrode layer 20 and the second flexible electrode layer 40 may be electrode layers made of materials such as Indium Tin Oxide (ITO), zinc Oxide, silver nanowires, metal grids, or conductive polymers (PEDOT: PSS), and as an optional scheme, the materials adopt metal grids which are low in manufacturing cost, good in conductive performance, and bendable, or the PEDOT: PSS.
For the elastic insulating medium layer 30 in the capacitive pressure sensor, a pressure sensitive elastomer is used, such as: polydimethylsiloxane (PDMS), polyurethane elastomers (TPU), or silicone rubber.
The silicon nitride layer and the silicon oxide layer stacked on the buffer layer 50 have a good buffer effect.
The AMOLED comprises a driving circuit, an Organic Light Emitting Diode (OLED) and a Thin Film packaging layer, wherein a Thin-Film Transistor (TFT) material is one of P-type Low-Temperature polysilicon (LTPS), N-type LTPS or Indium Gallium Zinc Oxide (IGZO); the OLED consists of red, green and blue pixels; the thin film package is composed of an inorganic layer (SiNxOx) and a silicon-containing organic layer.
For the convenience of understanding the display screen provided in this embodiment, the following description is made with reference to the manufacturing method thereof.
Example 1
In this embodiment, a capacitive pressure sensing integrated flexible display screen based on P-type LTPS TFT is taken as an example for explanation.
Firstly, coating flexible plastic PI liquid on a glass substrate to form a PI film with the thickness of about 20-40um at the high temperature of about 400 ℃;
then, preparing a metal grid or ITO (indium tin oxide) on PI (polyimide) by using an empty Mask with the thickness of about 100-200nm as a lower electrode for capacitive pressure induction, coating an elastomer (such as PDMS) solution on the lower electrode, drying the solvent at the high temperature of about 200 ℃ to form a PDMS thin film dielectric layer, and then preparing an upper electrode in the same preparation mode as the lower electrode;
finally, SiNx and SiOx are deposited on the pressure induction upper electrode in a CVD mode to form a buffer layer 50, the thickness of the buffer layer is about 20 microns, a P-type LTPS array and an OLED device are prepared on the buffer layer 50, and an organic/inorganic laminated thin film is deposited on the OLED device to serve as an encapsulation layer of the AMOLED.
In this embodiment, with the integration of capacitive pressure sensing at flexible display screen, the same flexible basement of sharing, the centre does not have the adhesion layer, is favorable to the attenuate of display module's thickness and the promotion of bending capability.
Example 2
In this embodiment, a capacitive pressure sensing integrated flexible display screen based on n-type LTPS or IGZO TFTs is taken as an example for explanation.
Firstly, coating flexible plastic PI liquid on a glass substrate to form a PI film with the thickness of about 20-40um at the high temperature of about 400 ℃;
then, preparing a metal grid or ITO (indium tin oxide) on PI (polyimide) by using an empty Mask with the thickness of about 100-200nm as a lower electrode for capacitive pressure induction, coating an elastomer (such as PDMS) solution on the lower electrode, drying the solvent at the high temperature of about 200 ℃ to form a PDMS thin film dielectric layer, and then preparing an upper electrode in the same preparation mode as the lower electrode;
finally, SiNx and SiOx are deposited on the pressure induction upper electrode in a CVD mode to form a buffer layer 50, the thickness of the buffer layer is about 20um, an n-type LTPS or IGZO array and an OLED device are prepared on the buffer layer 50, and an organic/inorganic laminated thin film is deposited on the OLED device to serve as an encapsulation layer of the AMOLED.
In the embodiment, the display driving TFT is made of n-type LTPS or IGZO, which increases the material utilization selectivity of the capacitive pressure sensing integrated flexible display module.
It can be seen from the above specific embodiments 1 and 2 that the display screen provided by this embodiment improves the connection strength between the capacitive pressure sensor and the display module, improves the separation between the display module and the capacitive pressure sensor during bending, and the display module and the capacitive pressure sensor can be connected without using an adhesive layer, thereby reducing the thickness of the whole display screen.
As shown in fig. 3, the present embodiment further provides a mobile terminal, which includes the display screen 100 of any one of the above first frame 201 and the second frame 202, wherein the first frame 201 and the second frame 202 are hinged through a hinge 300, and the display screen 100 is disposed in a middle frame 200 enclosed by the first frame 201 and the second frame 202.
Specifically, the main physical components of the mobile terminal disclosed in the present application include a display screen 100 of the integrated capacitive pressure sensor, a rotating shaft 300, a middle frame 200, a battery, a processing chip, and a main board. The middle frame 200 of the mobile terminal comprises a first frame body 201 and a second frame body 202 which are in a U shape and are opposite to each other, wherein the first frame body 201 and the second frame body 202 are rotatably connected through a rotating shaft 300 and enclose the middle frame 200, and the display screen 100 is arranged in the middle frame 200. When the terminal is used, the rotation shaft 300 is used for bending the terminal, the display screen 100 placed on the middle frame 200 is bent along with the terminal, and the processing chip in the mobile terminal is used for judging the bending angle of the first frame body 201 relative to the second frame body 202 according to the capacitance change of the pressure-sensitive capacitor in the display screen 100 when the first frame body 201 and the second frame body 202 are bent through the rotation shaft 300. Specifically, a capacitance change signal generated by bending is processed by a processing chip on the main board, and the processing chip judges the bending angle of the mobile terminal according to the capacitance change of the pressure-sensitive capacitor when the mobile terminal is bent. And the processing chip is also used for executing the set control operation when the bending angle of the mobile terminal exceeds a set value. And feeds back the relevant applications to the display screen 100, and the battery is the power supply for the display screen 100 and the motherboard.
As shown in fig. 4 and 5, fig. 4 shows a bending condition of the mobile terminal, fig. 5 shows a change of the corresponding capacitive pressure sensor when bending, as shown in fig. 4, a voltage between the first flexible electrode layer 20 and the second flexible electrode layer 40 is constant, when bending the screen, a thickness of the elastic insulating medium layer 30 at an edge of the display screen 100 is d1, a thickness d2 of the elastic insulating medium layer 30 in a bending region (bending outward is compressed), the change of the thickness is determined by a change (θ) of a bending angle, where θ is an included angle between an axis of the end surface of the rotating shaft 300 and the middle frame 200 (as shown in fig. 6). The change (C) of the capacitance is related to the thickness of the dielectric layer, and a corresponding bending angle is obtained according to the capacitance value; in particular, the method comprises the following steps of,
d＝f(θ)
C＝A/d＝A/f(θ)
as can be seen from the above formula, the bending angle of the mobile terminal can be determined by the thickness of the elastic insulating medium layer 30.
Of course, it should be understood that, in addition to the above-mentioned design scheme that the display screen 100 is bent outward, the mobile terminal provided in this embodiment may also adopt the display screen 100 shown in fig. 7, in which, as shown in fig. 8, fig. 8 shows a schematic bending diagram of the elastic insulating medium layer 30, and the bending angle of the mobile terminal may be calculated from the thickness d4 (inward bending) of the elastic insulating medium layer 30 in the bending region.
In the above example, the processing chip is further configured to execute the set control operation when the bending angle of the mobile terminal exceeds the set value. Specifically, the thickness of the elastic insulating medium layer 30 changes due to the bending of the display screen 100, so as to generate a change in the capacitance signal, and the processing chip can obtain a change in the bending angle according to the change in the capacitance signal, and complete some applications such as web browsing, reading and page turning, game operation, and image scaling according to an operation instruction corresponding to the bending angle.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A display screen is characterized by comprising a flexible substrate, a first flexible electrode layer deposited on the flexible substrate; the elastic insulating medium layer is deposited on the first flexible electrode layer, and the second flexible electrode layer is deposited on the elastic insulating medium layer; the display device further comprises a light-emitting display layer arranged on the second flexible electrode layer; the first flexible electrode layer, the elastic insulating medium layer and the second flexible electrode layer form a pressure-sensitive capacitor;
the flexible substrate is a bearing substrate of the light-emitting display layer and the pressure-sensitive capacitor.
2. A display screen as recited in claim 1, wherein a buffer layer is disposed between the light emitting display layer and the second flexible electrode layer.
3. The display panel according to claim 2, wherein the buffer layer comprises a silicon nitride layer and a silicon oxide layer which are stacked.
4. A display screen as recited in claim 1, wherein the light emitting display layer includes a driver circuit and an organic light emitting diode connected to the driver circuit.
5. The display screen of claim 1, wherein the flexible substrate is a glass substrate or a plastic substrate.
6. The display screen of claim 1, wherein the elastic insulating medium layer is a medium layer made of a pressure sensitive elastomer material.
7. The display screen of claim 6, wherein the pressure sensitive elastomeric material comprises: polydimethylsiloxane, polyurethane elastomers or silicone rubber.
8. The display screen of claim 1, wherein the first flexible electrode layer and the second flexible electrode layer are both made of indium tin oxide, zinc oxide, and silver nanowires.
9. A display screen according to claim 1, wherein the flexible substrate has a thickness of between 10-50 um.
10. A mobile terminal, comprising a first frame body, a second frame body and the display screen according to any one of claims 1 to 9, wherein the first frame body and the second frame body are hinged through a rotating shaft, and the display screen is disposed in a middle frame enclosed by the first frame body and the second frame body.
11. The mobile terminal of claim 10, wherein the processing chip in the mobile terminal is configured to determine a bending angle of the first frame body with respect to the second frame body according to a capacitance change of a pressure-sensitive capacitor in the display screen when the first frame body and the second frame body are bent through a rotating shaft.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2016111488658 | 2016-12-13 |
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| US6212057B1 (en) * | 1998-12-22 | 2001-04-03 | Matsushita Electric Industrial Co., Ltd. | Flexible thin film capacitor having an adhesive film |
| CN203014919U (en) * | 2013-01-24 | 2013-06-19 | 广东欧珀移动通信有限公司 | Foldable double-screen cell phone |
| CN105653162A (en) * | 2014-11-13 | 2016-06-08 | 昆山工研院新型平板显示技术中心有限公司 | Flexible display device operation control method |
| CN205334427U (en) * | 2015-12-31 | 2016-06-22 | 华勤通讯技术有限公司 | Mobile terminal and pressure -sensitive device thereof |
| CN106024839A (en) * | 2016-07-12 | 2016-10-12 | 武汉华星光电技术有限公司 | Foldable OLED display |
| CN205721724U (en) * | 2016-06-03 | 2016-11-23 | 厦门天马微电子有限公司 | Touch-control display panel |
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| US6212057B1 (en) * | 1998-12-22 | 2001-04-03 | Matsushita Electric Industrial Co., Ltd. | Flexible thin film capacitor having an adhesive film |
| CN203014919U (en) * | 2013-01-24 | 2013-06-19 | 广东欧珀移动通信有限公司 | Foldable double-screen cell phone |
| CN105653162A (en) * | 2014-11-13 | 2016-06-08 | 昆山工研院新型平板显示技术中心有限公司 | Flexible display device operation control method |
| CN205334427U (en) * | 2015-12-31 | 2016-06-22 | 华勤通讯技术有限公司 | Mobile terminal and pressure -sensitive device thereof |
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