CN108683269B - Display module and charging method thereof - Google Patents

Display module and charging method thereof Download PDF

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Publication number
CN108683269B
CN108683269B CN201810552821.4A CN201810552821A CN108683269B CN 108683269 B CN108683269 B CN 108683269B CN 201810552821 A CN201810552821 A CN 201810552821A CN 108683269 B CN108683269 B CN 108683269B
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China
Prior art keywords
coil
display screen
flexible display
wireless charging
display module
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CN201810552821.4A
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CN108683269A (en
Inventor
孔鹏飞
金波
朱修剑
葛明伟
王峥
张金泉
张小宝
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
    • B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B9/041—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/208—Touch screens

Abstract

The invention relates to a display module and a charging method of the display module, wherein the display module comprises a flexible display screen with a wireless charging function; the flexible display screen back sets up the coil, be equipped with OLED component district and a plurality of electric capacity on the FPC of flexible display screen, a plurality of electric capacities set up outside OLED component district, according to the condition of buckling of flexible display screen selects one or more of them electric capacity as wireless charging capacitance with the coil is connected, so that the resonant frequency of flexible display screen is unanimous with the resonant frequency who is used for the power that wirelessly charges. Due to the fact that the corresponding capacitor can be selected to be connected with the coil according to the bending condition of the flexible display screen, the wireless charging resonance frequency of the flexible display screen is adjustable, the resonance frequency of the sending end and the resonance frequency of the receiving end are kept consistent, wireless charging of the flexible display device is achieved, and wireless charging efficiency is improved.

Description

Display module and charging method thereof
Technical Field
The invention relates to the field of display, in particular to a display module, a preparation method and a method for improving the charging efficiency of the display module.
Background
The flexible display screen can be suitable for various application environments due to the advantages of random deformation, flexibility, convenient carrying and the like, such as: terminal equipment such as smart phones, VR/AR, wearable equipment. Since the wireless charging device is applicable to various use environments and is not limited by a power line, a user can conveniently perform charging application, and many electronic devices begin to use wireless charging at present.
The structure of the flexible display screen with wireless charging function in the prior art is shown in fig. 1, fig. 1 shows a schematic structural diagram before and after the flexible display screen in the prior art is bent, as shown in fig. 1, the flexible display screen 2 is curled and stored in the cylindrical shell 1 when not in use, and is drawn out and unfolded from the cylindrical shell 1 when in use, and in practical use, as the flexible display screen can be bent and deformed to different degrees like paper, after the flexible display screen is bent, a coil on the flexible display screen is correspondingly bent and is not placed in a plane any more, the inductance of the coil can be greatly changed along with the bending of the coil, and the coil of the existing device for providing wireless charging cannot be freely deformed according to use requirements and charging environment, therefore, after the flexible display screen is bent and deformed, the inductance of the coil at the back of the flexible display screen also changes greatly, so that the resonance frequencies of the electric energy transmitting end (a device for providing wireless charging) and the electric energy receiving end (the flexible display screen) are inconsistent. In the wireless charging technology, electric energy is transmitted in an electric field and a magnetic field between a charger and equipment by using magnetic resonance and is only transmitted between coils resonating at the same frequency, so that the flexible display screen after being bent cannot perform wireless power transmission or has extremely low transmission efficiency due to the change of the resonance frequency.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to provide a display module, a manufacturing method thereof, and a method for improving charging efficiency of the display module, so as to solve the problem in the prior art that the resonant frequency of an electric energy transmitting end and a receiving end is inconsistent due to bending deformation of a flexible display screen, so that the charging efficiency is low or wireless charging cannot be performed.
The invention provides a display module, which comprises a flexible display screen with a wireless charging function; the flexible display screen back sets up the coil, be equipped with OLED component district and a plurality of electric capacity on the FPC of flexible display screen, a plurality of electric capacities set up outside OLED component district, according to the condition of buckling of flexible display screen selects one or more of them electric capacity as wireless charging capacitance with the coil is connected, so that the resonant frequency of flexible display screen is unanimous with the resonant frequency who is used for the power that wirelessly charges.
Preferably, the display module comprises a current sensor, and the current sensor is used for acquiring coil currents corresponding to the capacitors.
Preferably, the coil has a first port and a second port, and the capacitor is connected to the coil by connecting the first port and the second port.
Preferably, the capacitance connected to the coil is a capacitance corresponding to a maximum current value.
Preferably, the display module further includes a substrate, a polyimide film and a first metal layer sequentially formed on the substrate, and the coil and the first port are formed by patterning the first metal layer.
Preferably, the display module further includes an insulating layer and a second metal layer, the insulating layer is formed on the first metal layer, the second metal layer is formed on the insulating layer, a through hole for connecting the first metal layer and the second metal layer is formed in the insulating layer, and the second port is formed by patterning the second metal layer.
Preferably, the insulating layer comprises silicon nitride, silicon oxide and/or silicon oxynitride.
The invention also provides a charging method of the display module, wherein the display module comprises a flexible display screen with a wireless charging function; the flexible display screen back sets up the coil, be equipped with OLED component district and a plurality of electric capacity on the FPC of flexible display screen, a plurality of electric capacity sets up outside OLED component district, the method includes: one or more capacitors are selected as wireless charging capacitors to be connected with the coils according to the bending condition of the flexible display screen, so that the resonant frequency of the flexible display screen is consistent with the resonant frequency of a power supply used for wireless charging. Preferably, the wireless charging capacitor is a capacitor corresponding to a maximum coil current.
According to the technical scheme, the flexible display screen FPC with the wireless charging function is additionally provided with the capacitors with different capacitance values, the capacitors and the wireless charging coil on the back of the flexible display screen body are utilized to form a wireless charging power receiving end, and the corresponding capacitors are selected according to the bending condition of the flexible display screen body to be connected with the output port of the wireless charging coil, so that the wireless charging resonance frequency of the flexible display screen is adjustable, the problems that the charging efficiency is low or wireless charging cannot be carried out due to bending of the flexible display screen body are solved, the charging efficiency of the wireless charging screen body is improved, and meanwhile, wireless charging boards of different brands can be flexibly corresponded.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a flexible display screen before and after bending in the prior art;
FIG. 2 is a schematic view of a flexible module according to embodiment 1;
FIG. 3 is a schematic diagram of the FPC board structure in embodiment 1;
FIG. 4 is a schematic view showing the structure of a coil film in example 1;
fig. 5 is a circuit composition of the power receiving terminal in embodiment 1;
fig. 6 is a schematic diagram of an electric energy transmitting terminal and an electric energy receiving terminal in embodiment 1;
fig. 7 is a schematic flowchart of a method for charging a display module according to embodiment 3.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but 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 construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
Embodiment 1 provides a display module, as shown in fig. 2, and fig. 2 is a schematic structural view of a flexible module in this embodiment. As shown in fig. 2, the display module has a wireless charging function, and the display module includes a flexible display screen 2 and an FPC 4 (not shown in fig. 2), and the flexible display screen and the FPC are stored in the cylindrical housing 1 when not in use, and are pulled out and unfolded from the cylindrical housing 1 when in use. This display module assembly is still including setting up wireless charging coil 2, this wireless charging coil 2 at this flexible display screen back and be provided with port a and port b for to this wireless charging coil input current.
Fig. 3 illustrates a schematic structural diagram of the FPC in the flexible module, as shown in fig. 3, a capacitance area 5 and other element areas 6 for display of the flexible display screen are arranged on the FPC 4 of the flexible display screen, and a plurality of capacitors are arranged in the capacitance area. One capacitor is selected as a wireless charging capacitor according to the bending condition of the flexible display screen and is connected with the coil, the wireless charging coil is provided with a first port a and a second port b, and the wireless charging capacitor is connected with the wireless charging coil through the first port a and the second port b.
Specifically, the wireless charging coil may be formed by depositing a metal, such as a copper foil layer, on the back of the display screen, and then forming the metal through an etching process, a deposition process, or a printed antenna process.
Fig. 4 shows a schematic diagram of a coil film layer structure as a further embodiment of this embodiment. As shown in fig. 4, the display module includes a substrate 7, a polyimide film 8, a first metal layer 9, an insulating layer, a second metal layer 12, and other device regions, such as TFT devices, formed on the substrate in sequence. Preferably, the insulating layer may include a silicon oxide layer 10 and/or a silicon nitride layer 11. And patterning the first metal layer to form a metal winding coil and a first port of the coil, patterning the insulating layer and etching to form a through hole for connecting the first metal layer and the second metal layer, wherein a second port of the coil is formed by patterning the second metal layer.
Fig. 5 illustrates a circuit composition of an electric energy receiving end on one side of the wireless charging flexible printed circuit board, as shown in fig. 5, the circuit composition of the wireless charging electric energy receiving end in this embodiment includes: the device comprises a battery 13, a rectifying circuit 14, a capacitor C positioned in a capacitor area 5 on the flexible display screen FPC 5 and a wireless charging coil L on the back of the display screen, wherein the capacitor C and the coil L form an electric energy receiving end.
Fig. 6 is a schematic diagram of a wireless charging power transmitting terminal and a wireless charging power receiving terminal, where Vs is a power supply, Rs is a power supply internal resistance, Cs is a capacitance on a wireless charging pad, Ls is an inductance on the wireless charging pad, and L is an inductance of a wireless charging coil on the back of a flexible screen body; c is a capacitor located on the FPC within the cylindrical housing; RL is the equivalent resistance of the rechargeable battery in the electronic watch. According to the wireless charging nuclear magnetic resonance principle, a capacitor Cs and an inductor Ls on a wireless charging disc, a capacitor C on the flexible display screen FPC 5 and a wireless charging coil L on the back of the display screen meet the following formula, LsCs is LC, when the frequency of the electric energy sending end 15 is consistent with that of the electric energy receiving end 16, resonance occurs, and energy is coupled through the coils to achieve energy transfer. Based on this, in embodiment 1, by arranging a plurality of capacitors on the flexible screen FPC, when the flexible screen is bent, the wireless charging coil L on the back of the flexible screen is also bent, which causes the inductance change of the coil, and at this time, the resonance frequency of the transmitting end and the receiving end can be kept consistent by selecting corresponding capacitance values.
Specifically, a current sensor can be arranged in the display module, coil currents corresponding to the capacitors are collected through the current sensor, and the capacitor corresponding to the highest coil current value is selected from the coil currents and used as a wireless charging capacitor to be connected with the port of the wireless charging coil.
By arranging the selectable capacitor area, the corresponding capacitor is selected according to the bending degree of the flexible display module to be connected with the wireless charging coil, so that the resonance frequencies of the sending end and the receiving end are kept consistent, wireless charging of the flexible display device is realized, and the wireless charging efficiency is improved; and selecting a capacitor corresponding to the maximum coil current value as a wireless charging capacitor to be connected with the coil, so that the best charging efficiency can be obtained on the basis of ensuring the consistent frequency, and the wireless charging efficiency is further improved.
Example 2
Embodiment 2 provides a display module, the difference of display module and embodiment 1 lies in: the wireless charging capacitor corresponding to the highest coil current value can be a plurality of capacitors, the plurality of capacitors can be in a series connection or parallel connection mode, different capacitance values can be obtained by selecting the plurality of capacitors in series connection or parallel connection, multi-frequency application can be finally obtained, resonance frequency requirements of different wireless charging electric energy sending ends are met, different wireless charging panels can be flexibly corresponding, application convenience of the wireless charging flexible display device is improved, and charging efficiency is improved.
Example 3
Embodiment 3 provides a method that display module assembly charges, and wherein this display module assembly includes the flexible display screen who possesses wireless function of charging, and this method includes: a plurality of capacitors arranged on the FPC of the flexible display screen and a coil arranged on the back of the flexible display screen form a power receiving end; according to the wireless charging nuclear magnetic resonance principle, namely, a capacitor Cs and an inductor Ls on a wireless charging disc, a capacitor C on the flexible display screen FPC 5 and a wireless charging coil L on the back surface of the display screen meet the following formula, LsCs is equal to LC, and one capacitor is selected from the capacitors according to the bending condition of the flexible display screen body and is connected with an output terminal of the coil.
Specifically, a method of selecting a capacitance connected to an output terminal of the coil is shown in fig. 7, and includes: when the power receiving end battery 3 has a certain amount of power, the following operations are performed:
s1, scanning coil current values corresponding to different capacitors in real time, specifically, connecting the different capacitors with output terminals of coils positioned on the back of the flexible display screen respectively, and scanning the coil current values corresponding to the different capacitors in real time through a built-in current sensor;
s2, determining the capacitance for wireless charging according to the current scanning result: selecting one capacitor from the plurality of capacitors as a capacitor for wireless charging according to the bending condition of the flexible screen body, and connecting the capacitor with an output terminal of the coil for wireless charging; preferably, the capacitor corresponding to the maximum coil current is used as the capacitor for wireless charging;
s3, repeating the steps S1 and S2, and through the operation, the frequency of the wireless charging electric energy receiving end can be monitored and adjusted in real time, so that the frequency of the electric energy receiving end is consistent with that of the electric energy transmitting end, the wireless charging efficiency is improved, and the smooth completion of charging is ensured. In practice, after step S2, a waiting time, such as 2 seconds, may be waited for, and the specific waiting time may be freely selected according to actual needs to improve the accuracy of monitoring and adjusting.
Because can select corresponding electric capacity and be connected with wireless charging coil according to the crooked degree of flexible display module assembly, can keep the resonant frequency of sending end and receiving terminal unanimous to realize this flexible display device's wireless charging, and improve wireless charging efficiency.
Example 4
Embodiment 4 provides a method for charging a display module, which is different from the charging method in embodiment 3 in that:
the capacitor used for wireless charging in the step S2 may be a capacitor formed by connecting the plurality of capacitors in series or in parallel, such an operation may satisfy the resonant frequency requirements of different wireless charging power transmitting terminals, different capacitance values may be obtained by selecting the plurality of capacitors in series or in parallel, accordingly, multi-frequency applications may be finally obtained, different wireless charging panels may be flexibly corresponding, the application convenience of the wireless charging flexible display device is increased, and the charging efficiency is improved.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (3)

1. The utility model provides a display module assembly which characterized in that: the display module comprises a flexible display screen with a wireless charging function; the coil is integrally arranged on the back face of the flexible display screen, an OLED element area and a plurality of capacitors are arranged on an FPC of the flexible display screen, the capacitors are arranged outside the OLED element area, and the coil and the capacitors form an electric energy receiving end; the display module further comprises a current sensor, the current sensor is used for collecting coil currents corresponding to the capacitors in real time, one or more capacitors are selected to be connected in series or in parallel as a wireless charging capacitor to be connected with the coil according to the coil currents corresponding to the capacitors and the bending condition of the flexible display screen, so that the resonance frequency of an electric energy receiving end of the flexible display screen is consistent with the resonance frequency of a power supply used for wireless charging, and the capacitor connected with the coil is the capacitor corresponding to the maximum current value;
the coil is provided with a first port and a second port, and the capacitor is connected with the coil by connecting the first port and the second port;
the display module further comprises a substrate, a polyimide film and a first metal layer which are sequentially formed on the substrate, and the coil and the first port are formed by patterning the first metal layer;
the display module further comprises an insulating layer and a second metal layer, the insulating layer is formed on the first metal layer, the second metal layer is formed on the insulating layer, a through hole for connecting the first metal layer and the second metal layer is formed in the insulating layer, and the second port is formed by patterning the second metal layer.
2. The display module according to claim 1, wherein: the insulating layer includes silicon nitride, silicon oxide and/or silicon oxynitride.
3. A charging method of the display module according to claim 1 or 2, wherein the display module comprises a flexible display screen with a wireless charging function; the flexible display screen back is integrated to be provided with the coil, be equipped with OLED component district and a plurality of electric capacity on the FPC of flexible display screen, a plurality of electric capacities set up outside OLED component district, the coil with the electric capacity constitutes the electric energy receiving terminal, the display module assembly still includes current sensor, its characterized in that: the method comprises the following steps:
scanning coil current values corresponding to different capacitors in real time by using the current sensor;
and selecting one or more capacitors to be connected in series or in parallel as a wireless charging capacitor to be connected with the coil according to the coil current value and the bending condition of the flexible display screen, so that the resonance frequency of the electric energy receiving end of the flexible display screen is consistent with the resonance frequency of a power supply for wireless charging, and the wireless charging capacitor is a capacitor corresponding to the maximum coil current.
CN201810552821.4A 2018-05-31 2018-05-31 Display module and charging method thereof Active CN108683269B (en)

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CN111261037B (en) * 2018-11-30 2021-09-21 北京小米移动软件有限公司 Foldable equipment, power supply method and device
CN111276044B (en) 2018-12-04 2021-11-23 京东方科技集团股份有限公司 Power supply module, flexible display panel and display device
CN109378337A (en) * 2018-12-04 2019-02-22 广东速美达自动化股份有限公司 A kind of OLED screen curtain and wireless charging system with wireless charging function
CN110957795B (en) * 2019-12-05 2021-08-06 深圳市洲明科技股份有限公司 Charging circuit, charging device and display screen

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