CN110880294B - OLED driving power supply and electronic product - Google Patents
OLED driving power supply and electronic product Download PDFInfo
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- CN110880294B CN110880294B CN201911257859.XA CN201911257859A CN110880294B CN 110880294 B CN110880294 B CN 110880294B CN 201911257859 A CN201911257859 A CN 201911257859A CN 110880294 B CN110880294 B CN 110880294B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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Abstract
The invention discloses an OLED driving power supply and an electronic product, wherein the driving power supply comprises: the power supply board comprises a main power supply board, a main board and an on-screen power supply board; the main power panel is electrically connected with the main board and the on-screen power panel; the main power panel is used for outputting a first electric signal and a second electric signal to the on-screen power panel according to a first enabling signal sent by the main board; and the on-screen power supply board is used for sequentially outputting a VDD electric signal and an EVDD electric signal according to the first electric signal and the second electric signal so as to light the OLED screen. The traditional power panel framework is changed into a split main power panel and on-screen power panel framework, so that the driving power supply is lighter and thinner on the basis of meeting strict time sequence control, and the electronic product is favorable for realizing the light and thin shape.
Description
Technical Field
The embodiment of the invention relates to the electronic circuit technology, in particular to an OLED (organic light emitting diode) driving power supply and an electronic product.
Background
The oled (organic light emitting diode) has advantages of self-luminescence, no need of backlight, no need of color filter and liquid crystal, and is superior to the conventional LCD and LED in image quality, response speed, thickness and viewing angle, so it has been widely used in recent years. With the gradual maturity of the OLED technology, the conventional LCD and LED televisions are gradually replaced by the televisions adopting the OLED as the display scheme, and meanwhile, the OLED televisions have a qualitative leap in image quality compared with the conventional LCD and LED televisions, and also have the characteristics of thin thickness, flexibility and the like. In combination with these characteristics, the OLED television is intended to be thinner and lighter in the future.
Specifically, fig. 1 is a schematic structural diagram of a conventional OLED driving power supply provided in the background art. Referring to fig. 1, when the television is powered on, the standby circuit outputs +5V power to supply power to the main board CPU; after the CPU of the main board works normally, firstly, an ON/OFF enabling signal is sent to a power supply circuit, so that the power supply circuit supplies power to a PFC circuit, a main LLC controller and an auxiliary LLC controller; the auxiliary LLC controller outputs +12V and +24V power supplies to supply power to each module of the mainboard according to the input of the PFC circuit and the power supply circuit; then, the mainboard CPU sends a VDD _ ON enabling signal to the switch module so that the switch outputs a VDD electric signal (+12V) to the OLED screen; then, the main board CPU sends an EVDD _ ON enabling signal to the main LLC controller, so that the main LLC controller outputs an EVDD electric signal (+24V) to the OLED screen according to the input of the PFC circuit and the power supply circuit; and the OLED screen is lightened according to the VDD signal and the EVDD signal which are input successively. When in standby, the main board receives the standby signal, and then sequentially turns off the output of the main circuit according to a certain time sequence to enter a standby state.
Therefore, the main circuits of the existing OLED driving power supply are mutually independent, and are convenient to be enabled and output by the main board signal according to a certain time sequence. However, the disadvantages are also evident: in order to meet the high time sequence requirement of power output, the overall structure of the OLED driving power supply is complex, so that the size of the power panel is large, and the light and thin appearance of an electronic product is difficult to realize.
Disclosure of Invention
In view of this, the present invention provides an OLED driving power supply and an electronic product, where the driving power supply is thinner and lighter on the basis of meeting strict timing control, and is beneficial to implementing the thinness of the electronic product.
In a first aspect, an embodiment of the present invention provides an OLED driving power supply, including: the power supply board comprises a main power supply board, a main board and an on-screen power supply board;
the main power panel is electrically connected with the main board and the on-screen power panel; the main power panel is used for outputting a first electric signal and a second electric signal to the on-screen power panel according to a first enabling signal sent by the main board; and the on-screen power supply board is used for sequentially outputting a VDD electric signal and an EVDD electric signal according to the first electric signal and the second electric signal so as to light the OLED screen.
In a second aspect, an embodiment of the present invention provides an electronic product, including any one of the OLED driving power supplies and an OLED panel provided in the embodiments of the present invention, wherein an on-panel power supply board in the OLED driving power supply is disposed on the OLED panel.
The driving power supply and the electronic product provided by the embodiment of the invention comprise a main power supply board, a mainboard and an on-screen power supply board; the main power panel is electrically connected with the main board and the on-screen power panel; the main power panel is used for outputting a first electric signal and a second electric signal to the on-screen power panel according to a first enabling signal sent by the main board; the on-screen power supply board is used for sequentially outputting a VDD electric signal and an EVDD electric signal according to the first electric signal and the second electric signal so as to light the OLED screen.
The traditional power panel framework is changed into a split main power panel and on-screen power panel framework, so that the main power panel is thinner; in addition, the main power panel generates a first isolated electrical signal and a second isolated electrical signal according to the first enable signal sent by the main board, so that the on-screen power panel sequentially generates a VDD electrical signal and an EVDD electrical signal according to the first electrical signal and the second electrical signal to light the OLED screen, and the time sequence requirement is met. Therefore, the driving power supply is lighter and thinner on the basis of meeting strict time sequence control, and the electronic product is favorable for realizing the light and thin shape.
Drawings
FIG. 1 is a schematic diagram of a prior art OLED driving power supply provided in the background art;
fig. 2 is a schematic structural diagram of an OLED driving power supply according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of an OLED driving power supply according to an embodiment of the invention;
fig. 4 is a schematic structural diagram of a power supply board on a screen in an OLED driving power supply according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an electronic product according to a second embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example one
Fig. 2 is a schematic structural diagram of an OLED driving power supply according to a first embodiment of the present invention. The OLED driving power supply provided by the embodiment of the invention can be suitable for OLED driving scenes of electronic equipment such as televisions, monitors, audio-visual education, rear projection plasma display and the like which adopt OLEDs as display schemes.
Referring to fig. 2, the driving power supply provided by the embodiment of the present invention includes: a main power board 10, a main board 20 and an on-screen power board 30;
the main power board 10 is electrically connected to the main board 20 and the on-screen power board 30; the main power panel 10 is configured to output a first electrical signal and a second electrical signal to the on-screen power panel 30 according to the first enable signal sent by the main board 20; the on-screen power supply board 30 is configured to sequentially output a VDD electrical signal and an EVDD electrical signal according to the first electrical signal and the second electrical signal to illuminate the OLED screen.
The driving power supply provided by the embodiment of the invention is a split-type framework driving power supply, wherein the main power supply board and the main board can be integrated at one position, and the on-screen power supply board can be configured on the OLED screen (for example, spliced at the edge position of the screen), so that the main power supply board is thinner compared with the traditional power supply board, the thickness of the screen of the OLED screen is not increased, and the electronic equipment has light and thin feeling. Taking OLED electronics as an example, the main power board and the motherboard may be integrated into a set-top box, and the on-screen power board may be configured on the screen.
After the main board normally works, the main board may send a first enable signal to the main board, where the first enable signal is, for example, a high level signal. The main power strip may generate isolated first and second electrical signals after receiving the first enable signal. Wherein, the first electric signal and the second electric signal can be a 20V direct current electric signal and a 390V high-voltage direct current electric signal respectively. The main power panel sends the first signal and the second signal to the on-screen power panel, so that the on-screen power panel sequentially generates a VDD electric signal and an EVDD electric signal to supply power to the OLED screen. The OLED screen can light up after receiving the VDD electric signal and the EVDD electric signal in sequence. The VDD electrical signal and the EVDD electrical signal may be 12V dc electrical signal and 22V dc electrical signal, respectively. Thereby meeting the requirement of strict time sequence of the OLED driving power supply.
According to the driving power supply provided by the invention, the traditional power supply board framework is changed into the split main power supply board and on-screen power supply board framework, so that the main power supply board is thinner, and the light and thin degree of an OLED is kept; in addition, the main power panel generates a first isolated electrical signal and a second isolated electrical signal according to the first enable signal sent by the main board, so that the on-screen power panel sequentially generates a VDD electrical signal and an EVDD electrical signal according to the first electrical signal and the second electrical signal to light the OLED screen, and the time sequence requirement is met. Therefore, the driving power supply is lighter and thinner on the basis of meeting strict time sequence control, and the electronic product is favorable for realizing the light and thin shape.
Fig. 3 is a schematic structural diagram of an OLED driving power supply according to a first embodiment of the present invention.
Referring to fig. 3, optionally, the main power panel 10 includes: a first power supply module 11 and a second power supply module 12; the first power supply module 11 comprises a first end, a second end, a third end, a fourth end, a fifth end, a sixth end and a seventh end; the second power supply module 12 includes a first end, a second end, a third end and a fourth end; the first end, the second end, the third end, the fourth end and the fifth end of the first power supply module 11 are electrically connected with the motherboard 20, the sixth end of the first power supply module 11 is electrically connected with the first end of the second power supply module 12, and the seventh end of the first power supply module 11 is electrically connected with the second end of the second power supply module 12; the third end and the fourth end of the second power supply module 12 are electrically connected with the on-screen power supply board 30; the first end of the first power supply module 11 is configured to output a third electrical signal to the motherboard 20 when the power supply is turned on; a second end of the first power supply module 11 is configured to receive a second enable signal sent by the motherboard 20, where the second enable signal is generated when the motherboard 20 receives a third electrical signal; the first power supply module 11 outputs a fourth electrical signal and a fifth electrical signal to the motherboard 20 through the third end and the fourth end, respectively, and outputs a sixth electrical signal to the first end of the second power supply module 12 through the sixth end, according to the second enable signal; the fifth end of the first power supply module 11 is configured to receive a first enable signal sent by the motherboard 20, where the first enable signal is generated when the motherboard receives the fourth electrical signal and the fifth electrical signal; the first power supply module 11 outputs a seventh electrical signal to the second end of the second power supply module 12 through the seventh end according to the first enable signal; the second power supply module 12 outputs the first electrical signal through the third terminal and the second electrical signal through the fourth terminal according to the sixth electrical signal received by the first terminal and the seventh electrical signal received by the second terminal.
When the main power board is powered on, the first end of the first power supply module may output a third electrical signal (e.g., +5V dc signal in fig. 3) to the motherboard for supplying power to the CPU of the motherboard. When the motherboard CPU works normally, the motherboard CPU may send a second enable signal (e.g., an ON/OFF signal in fig. 3) to the second terminal of the first power supply module, and the second enable signal may be a high level signal. The first power supply module outputs a fourth electrical signal (for example, a +20V dc electrical signal in fig. 3) and a fifth electrical signal (for example, a +12V dc electrical signal in fig. 3) to the motherboard through the third terminal and the fourth terminal respectively according to the second enable signal, where the +12V dc electrical signal may be used to supply power to the circuit module of the motherboard, and the +20V dc electrical signal may be used to supply power to the audio module. In addition, in practical applications, modules with different functions (for example, a sub board or a constant current board may also be included) are arranged in different electronic devices, and the requirements for the power supply are different, and the first power supply module of the main power supply board provided in the embodiment of the present invention may also output other different electrical signals according to the power supply requirements of different modules.
The first power supply module can also output a sixth electrical signal to the first end of the second power supply module through the sixth end according to the second enable signal to serve as an input electrical signal of the second power supply module, but at this time, because the second power supply module is not started yet, the second power supply module cannot output the first electrical signal and the second electrical signal. When the +12V electrical signal stably supplies power to the circuit module of the motherboard, the motherboard may send a first enable signal (e.g., a main LLC _ ON signal in fig. 3) to the fifth end of the first power supply module, and the first enable signal may be a high level signal. The first power supply module can output a seventh electric signal to the second end of the second power supply module through the seventh end according to the first enabling signal, so as to start the second power supply module. After the second power supply module is activated, the sixth signal may be converted into a first electrical signal (e.g., a dc signal of the on-screen power VCC20V in fig. 3) and a second electrical signal (e.g., a dc 390V electrical signal in fig. 3), and output through the third terminal and the fourth terminal, respectively.
Referring again to fig. 3, further, the first power supply module 11 includes: the standby power supply circuit, a secondary rectification circuit of the standby power supply circuit, the bridgeless PFC circuit, the auxiliary LLC controller and a secondary rectification circuit of the auxiliary LLC controller; the standby power supply circuit comprises a first end, a second end, a third end, a fourth end, a fifth end and a sixth end; the secondary rectifying circuit of the standby power supply circuit comprises a first end and a second end; the bridgeless PFC circuit comprises a first end, a second end and a third end; the auxiliary LLC controller comprises a first end, a second end and a third end; the secondary rectifying circuit of the auxiliary LLC controller comprises a first end, a second end and a third end; the first end of the standby power supply circuit is coupled with the first end of the secondary rectifying circuit of the standby power supply circuit; the second end of a secondary rectification circuit of the standby power supply circuit is used as the first end of the first power supply module; the second end of the standby power supply circuit is used as the second end of the first power supply module; the third end of the standby power supply circuit is used as the fifth end of the first power supply module; the fourth end of the standby power supply circuit is electrically connected with the first end of the auxiliary LLC controller; the fifth end of the standby power supply circuit is used as the seventh end of the first power supply module; the sixth end of the standby power supply circuit is electrically connected with the first end of the bridgeless PFC circuit; the second end of the PFC circuit is electrically connected with the second end of the auxiliary LLC controller; a third end of the PFC circuit is used as a sixth end of the first power supply module; the third end of the auxiliary LLC controller is coupled with the first end of the secondary rectification circuit of the auxiliary LLC controller; and the second end and the third end of the secondary rectifying circuit of the auxiliary LLC controller are respectively used as the third end and the fourth end of the first power supply module.
Further, the second power supply module 12 includes: a primary LLC controller and a secondary rectification circuit of the primary LLC controller; the main LLC controller comprises a first end, a second end and a third end; the secondary rectifying circuit of the main LLC controller comprises a first end, a second end and a third end; the first end of the main LLC controller is used as the first end of the second power supply module; a second end of the main LLC controller is used as a second end of the second power supply module; the third end of the main LLC controller is coupled with the first end of the secondary rectifying circuit of the main LLC controller; and the second end and the third end of the secondary rectifying circuit of the main LLC controller are respectively used as the third end and the fourth end of the second power supply module.
As shown in fig. 3, when the main power board is powered on, the standby power supply circuit is powered on, and the coupling coil at the first end of the standby power supply circuit can enable the secondary rectification circuit of the standby power supply circuit to output a +5V direct current electrical signal, and send the direct current electrical signal to the main board for supplying power to the CPU of the main board. When the main board CPU works normally, a high-level ON/OFF signal can be sent to the second end of the standby power supply circuit, so that the standby power supply circuit generates VCC15V according to the ON/OFF signal and sends the VCC15V to the auxiliary LLC controller and the bridgeless PFC circuit through the fourth end and the fifth end respectively, and the auxiliary LLC controller and the bridgeless PFC circuit are started. The bridgeless PFC circuit can generate stable high-voltage direct current (for example, 400V high-voltage direct current) and send the stable high-voltage direct current to the second end of the auxiliary LLC controller and the first end of the main LLC controller through the second end and the third end respectively. And the auxiliary LLC controller transforms the high-voltage direct current into a +20V direct current signal and a +12V direct current signal through a secondary rectification circuit of the auxiliary LLC controller through a coupling coil at a third end according to VCC15V and the high-voltage direct current, and the signals are respectively output to the mainboard and used for supplying power to each module of the mainboard. When the power supply of each module of the mainboard is stable, the mainboard can send a high-level main LLC _ ON signal to the third end of the standby power supply circuit. The standby power supply circuit may output VCC15V to the second end of the main LLC controller via the sixth end in accordance with the main LLC _ ON signal for starting the main LLC controller. After the main LLC controller is started, the third end coupling coil is coupled with the first end of the secondary rectifying circuit of the main LLC controller, so that 400V high-voltage direct current input by the bridgeless PFC circuit is converted into an on-screen power supply VCC20V direct current electric signal and a direct current 390V electric signal, and the on-screen power supply board is sent.
The standby power supply circuit may include an ON/OFF control circuit, configured to generate VCC15V according to an ON/OFF signal, and send the VCC to the auxiliary LLC controller and the bridgeless PFC circuit through the fourth terminal and the fifth terminal, respectively. A main LLC _ ON power switching circuit may also be included for enabling the main LLC controller by outputting VCC15V through the sixth terminal to the second terminal of the main LLC controller in response to the main LLC _ ON signal. The ON/OFF control circuit and the main LLC _ ON power supply switching circuit are prior art, for example, refer to a switch control circuit and an enable switching circuit in patent (CN201811044599.3), and are not described herein again.
Fig. 4 is a schematic structural diagram of a power supply board on a screen in an OLED driving power supply according to an embodiment of the present invention.
Referring to fig. 4, optionally, the on-screen power supply board 30 includes: a first conversion module 31, an on-screen motherboard 32, a switching circuit 33, and a second conversion module 34; the first conversion module 31 includes a first end, a second end, a third end and a fourth end; the on-screen motherboard 32 includes a first terminal, a second terminal, and a third terminal; the switching circuit 33 includes a first terminal, a second terminal, and a third terminal; the second conversion module 34 includes a first terminal, a second terminal, a third terminal, and a fourth terminal; the third end of the first conversion module 31 is electrically connected with the first end of the on-screen main board 32; the fourth end of the first conversion module 31 is electrically connected with the first end of the switching circuit 33; a second terminal of the on-screen motherboard 32 is electrically connected to a second terminal of the switching circuit 33; the third end of the on-screen mainboard 32 is electrically connected with the third end of the second conversion module 34; the third end of the switching circuit 33 is electrically connected with the OLED screen; the fourth end of the second conversion module 34 is electrically connected with the OLED panel; the first end and the second end of the first conversion module 31 and the first end and the second end of the second conversion module 34 are respectively used for receiving a first electrical signal and a second electrical signal sent by the main power panel 10; the first conversion module 31 generates an eighth electrical signal according to the first electrical signal and the second electrical signal, and outputs the eighth electrical signal through a third end and a fourth end; the on-screen motherboard 32 outputs a third enable signal through the second terminal according to the eighth electrical signal, and outputs a fourth enable signal through the third terminal after a preset delay; the switching circuit 33 converts the received eighth electrical signal into a VDD electrical signal according to the third enable signal, and outputs the VDD electrical signal through the third terminal; the second conversion module 34 converts the first electrical signal and the second electrical signal into an EVDD electrical signal according to the fourth enable signal, and outputs the EVDD electrical signal through the fourth terminal.
Optionally, the preset delay time is greater than or equal to 30 milliseconds.
The first conversion module and the second conversion module are two independent circuits of the power board on the screen. A first end of the first conversion module may receive a first electrical signal (e.g., a dc electrical signal of VCC20V in fig. 4) sent by the main power board, and a second end of the first conversion module may receive a second electrical signal (e.g., a dc 390V electrical signal in fig. 4) sent by the main power board; meanwhile, a first end of the second conversion module may receive a first electrical signal (e.g., a dc electrical signal of VCC20V in fig. 4) sent by the main power board, and a second end of the second conversion module may receive a second electrical signal (e.g., a dc 390V electrical signal in fig. 4) sent by the main power board. The first electrical signal can be used for supplying power to the first conversion module and the second conversion module. The first conversion module can convert the second direct current electric signal into an eighth electric signal (for example, the MB _12V direct current electric signal in fig. 4), and send the eighth electric signal to the on-screen motherboard through the third terminal, so as to supply power to the on-screen motherboard. Meanwhile, the first conversion module can also output the eighth electrical signal to the switching circuit through the fourth end, so that the switching circuit switches the eighth electrical signal into the VDD electrical signal after receiving the enable signal, and outputs the VDD electrical signal to the OLED screen. After the power supply of the ON-screen motherboard is stabilized, a third enable signal (e.g., VDD _ ON signal in fig. 4) with a high level may be output through the second terminal, and a fourth enable signal (e.g., EVDD _ ON signal in fig. 4) with a high level may be output through the third terminal after a preset delay (e.g., 30ms delay). After receiving the third enable signal, the switching circuit can convert the received eighth electrical signal into a VDD electrical signal and output the VDD electrical signal to the OLED panel through the third terminal. And the second conversion module converts the second electric signal into an EVDD electric signal according to the fourth enabling signal and outputs the EVDD electric signal to the OLED screen through the fourth end. The OLED screen can light up after receiving the VDD electric signal and the EVDD electric signal in sequence.
As can be seen from the above, the timing sequence of the OLED driving power supply at the time of starting up is substantially as follows: receiving an ON/OFF enable signal from a main power supply board, and supplying power to the main board by outputting +12V, wherein the stable output of +12V is achieved after about T1; the main board starts to work, data are sent to the OLED screen after the time of T2, and a main LLC _ ON signal is sent to the main power panel after the time of about T3; and receiving a main LLC _ ON signal from the main power supply board, starting to output the EVDD _22V voltage by the ON-screen power supply board, reaching stable output after the time of T4, and lighting the OLED screen. And outputting +12V to supply power to the main board from the main power supply board, and outputting EVDD _22V to supply power to the OLED screen from the on-screen power supply board, wherein the interval is at least 36 ms.
In addition, the timing of the OLED driving power supply when the device is turned off is roughly as follows: the on-screen power supply main board sends a low-level EVDD _ OFF enabling signal to the second on-screen LLC controller to stop EVDD _22V output; after the EVDD _22V stops outputting, the on-screen mainboard sends a low-level VDD _ OFF enabling signal to the switching circuit to stop the VDD _12V outputting; after the interval time T6, a low level ON/OFF enable signal is sent to the main power board, so that the main power board stops supplying power to the main power board, and the whole machine enters a standby state. Wherein T6 is not less than 30 ms.
By setting the preset time delay, the electrical signal output of the OLED driving power supply can have strict time sequence so as to successfully light the OLED screen.
Referring again to fig. 4, further, the first conversion module 31 includes: the LLC controller and the last-stage rectifying circuit of the first screen are arranged on the first screen; the first on-screen LLC controller comprises a first end, a second end and a third end; the first screen secondary rectifying circuit comprises a first end and a second end; a first end and a second end of the first on-screen LLC controller are respectively used as a first end and a second end of the first conversion module; the third end of the LLC controller on the first screen is coupled with the first end of the last-stage rectification circuit of the first screen; and the second end of the first screen secondary rectifying circuit is used as the third end and the fourth end of the first conversion module.
Further, the second conversion module 34 includes: an LLC controller and a last-stage rectifying circuit of the second screen are arranged on the second screen; the second on-screen LLC controller comprises a first end, a second end, a third end and a fourth end; the second screen secondary rectifying circuit comprises a first end and a second end; the first end, the second end and the third end of the second on-screen LLC controller are respectively used as the first end, the second end and the third end of the second conversion module; the fourth end of the LLC controller on the second screen is coupled with the first end of the last-stage rectifying circuit of the second screen; and the second end of the second screen secondary rectifying circuit is used as the fourth end of the second conversion module.
As shown in fig. 4, a first terminal of the first on-screen LLC control circuit receives direct current from an on-screen power supply VCC20V for powering the first on-screen LLC control circuit; the second end receives a 390V direct current electric signal and is in coil coupling with the first end of the first screen secondary rectifying circuit through the third end; the first screen last-stage rectifying circuit can transform a 390V direct-current electric signal into MB _12V direct current and output the direct-current electric signal, the MB _12V direct current is used for supplying power to the screen main board, and meanwhile the MB _12V direct current is transmitted to the switching circuit. The ON-screen mainboard is started to be in a working state after receiving the MB _12V direct current, and can firstly send a high-level VDD _ ON enabling signal to the second end of the switching module when in the working state, so that the switching module can switch the received MB _12V direct current into the VDD _12V direct current to supply power for the OLED screen. After the ON-screen main board sends the VDD _ ON enable signal and preset time delay, a high-level EVDD _ ON enable signal can be sent to the second ON-screen LLC controller. A first end of the second on-screen LLC controller receives on-screen power VCC20V direct current for powering the second on-screen LLC control circuit; the second end receives a 390V direct current electric signal and is in coil coupling with the first end of the secondary rectifying circuit of the second screen through the fourth end; when the third end of the LLC controller ON the second screen receives the EVDD _ ON enable signal, the 390V electric signal can be transformed into EVDD _22V direct current by the secondary rectifying circuit of the second screen, and the direct current is output and used for supplying power to the OLED screen. The power supply for the OLED screen in the embodiment of the invention can be understood as the power supply for the T-CON module of the OLED screen.
Optionally, the main power panel is electrically connected to the on-screen power panel, and includes: the main power panel is electrically connected with the power panel on the screen through the mainboard; and the mainboard is used for generating a first enabling signal when the normal connection with the on-screen power supply board is detected.
The main power panel is electrically connected with the screen power panel, and the main power panel and the screen power panel can be bridged through a mainboard. Specifically, the main power board is connected to the main board through an optical fiber line integrated with an optical fiber and a lead, and the main board is connected to the on-screen power board through an optical fiber line integrated with an optical fiber and a lead. When the main board receives a +12V direct current power supply signal transmitted by the main power supply board and works normally, whether the connection with the on-screen main board is normal (for example, whether the connection of an optical fiber line is normal) can be further detected; the main board may generate a first enable signal when detecting that the connection with the on-screen power board is normal, so that the main power board outputs a first electrical signal (e.g., an on-screen power supply VCC20V dc electrical signal) and a second electrical signal (e.g., a dc 390V electrical signal).
The driving power supply provided by the invention comprises a main power supply board, a main board and an on-screen power supply board; the main power panel is electrically connected with the main board and the on-screen power panel; the main power panel is used for outputting a first electric signal and a second electric signal to the on-screen power panel according to a first enabling signal sent by the main board; the power supply board on the screen is used for lighting the OLED screen according to the first electric signal and the second electric signal.
The traditional power panel framework is changed into a split main power panel and on-screen power panel framework, so that the main power panel is thinner; in addition, the main power panel generates a first isolated electrical signal and a second isolated electrical signal according to the first enable signal sent by the main board, so that the on-screen power panel sequentially generates a VDD electrical signal and an EVDD electrical signal according to the first electrical signal and the second electrical signal to light the OLED screen, and the time sequence requirement is met. Therefore, the driving power supply is lighter and thinner on the basis of meeting strict time sequence control, and the electronic product is favorable for realizing the light and thin shape.
Example two
The embodiment of the invention also provides an electronic product, which comprises any one of the OLED driving power supply and the OLED screen, wherein the screen power supply board in the OLED driving power supply is arranged on the OLED screen.
For example, fig. 5 is a schematic structural diagram of an electronic product according to a second embodiment of the present invention. Referring to fig. 5, the electronic product is an OLED television, wherein a main power board and a main board (not shown) in the OLED driving power supply are integrated in a set top box 501, and an on-screen power board 502 in the OLED driving power supply is disposed on an OLED screen 503. In fig. 5, the panel power plate 502 of the OLED driving power is disposed at the lower edge of the OLED panel 503, and is light, thin and slender, and the thickness of the OLED panel is not increased, so that the thinness of the OLED panel is maintained. And the panel power supply plate 502 is disposed at other positions of the OLED panel 503, such as the left edge or the right edge, which is not limited herein. In addition, by designing the split power supply framework of the main power supply board and the on-screen power supply board, the number of integrated circuits in the set-top box is reduced, and therefore the small and thin modeling design of the set-top box is also realized.
The electronic product provided by the embodiment of the invention can also be an electronic product such as a monitor, an audio-visual education program, a rear projection plasma display and the like which adopt the OLED as a display scheme. The OLED driving power source included in the electronic product is the same as the driving power source provided in the above embodiments, and the technical details that are not described in detail in this embodiment can be referred to the above embodiments, and have the same beneficial effects as the above embodiments.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (9)
1. An OLED driving power supply, comprising: the power supply board comprises a main power supply board, a main board and an on-screen power supply board;
the main power panel is electrically connected with the main board and the on-screen power panel; the main power panel is used for outputting a first electric signal and a second electric signal to the on-screen power panel according to a first enabling signal sent by the main board; the on-screen power supply board is used for sequentially outputting a VDD electrical signal and an EVDD electrical signal according to the first electrical signal and the second electrical signal so as to light the OLED screen;
the on-screen power board includes: the switching circuit comprises a first conversion module, an on-screen mainboard, a switching circuit and a second conversion module;
wherein the first conversion module comprises a first end, a second end, a third end and a fourth end; the screen upper main board comprises a first end, a second end and a third end; the switching circuit comprises a first terminal, a second terminal and a third terminal; the second conversion module comprises a first end, a second end, a third end and a fourth end;
the third end of the first conversion module is electrically connected with the first end of the on-screen mainboard; the fourth end of the first conversion module is electrically connected with the first end of the switching circuit; the second end of the on-screen mainboard is electrically connected with the second end of the switching circuit; the third end of the on-screen mainboard is electrically connected with the third end of the second conversion module; the third end of the switching circuit is electrically connected with the OLED screen; the fourth end of the second conversion module is electrically connected with the OLED screen;
the first end and the second end of the first conversion module and the first end and the second end of the second conversion module are respectively used for receiving a first electric signal and a second electric signal sent by the main power supply board; the first conversion module generates an eighth electrical signal according to the first electrical signal and the second electrical signal, and outputs the eighth electrical signal through the third end and the fourth end; the on-screen mainboard outputs a third enabling signal through the second end according to the eighth electric signal, and outputs a fourth enabling signal through the third end after preset delay; the switching circuit converts the received eighth electric signal into a VDD electric signal according to the third enabling signal and outputs the VDD electric signal through the third end; and the second conversion module converts the first electrical signal and the second electrical signal into an EVDD electrical signal according to the fourth enable signal, and outputs the EVDD electrical signal through the fourth end.
2. The driving power supply according to claim 1, wherein the main power board includes: the power supply device comprises a first power supply module and a second power supply module;
the first power supply module comprises a first end, a second end, a third end, a fourth end, a fifth end, a sixth end and a seventh end; the second power supply module comprises a first end, a second end, a third end and a fourth end;
the first end, the second end, the third end, the fourth end and the fifth end of the first power supply module are electrically connected with the mainboard, the sixth end of the first power supply module is electrically connected with the first end of the second power supply module, and the seventh end of the first power supply module is electrically connected with the second end of the second power supply module; the third end and the fourth end of the second power supply module are electrically connected with the power supply board on the screen;
the first end of the first power supply module is used for outputting a third electric signal to the mainboard when the power supply is switched on; the second end of the first power supply module is used for receiving a second enabling signal sent by the mainboard, and the second enabling signal is generated when the mainboard receives the third electric signal; the first power supply module outputs a fourth electric signal and a fifth electric signal to the mainboard through the third end and the fourth end respectively according to the second enable signal, and outputs a sixth electric signal to the first end of the second power supply module through the sixth end; the fifth end of the first power supply module is configured to receive the first enable signal sent by the motherboard, where the first enable signal is generated when the motherboard receives the fourth electrical signal and the fifth electrical signal; the first power supply module outputs a seventh electric signal to the second end of the second power supply module through the seventh end according to the first enabling signal;
and the second power supply module outputs the first electric signal through the third end and outputs the second electric signal through the fourth end according to the sixth electric signal received by the first end and the seventh electric signal received by the second end.
3. The driving power supply according to claim 2, wherein the first power supply module comprises: the standby power supply circuit, a secondary rectification circuit of the standby power supply circuit, the bridgeless PFC circuit, the auxiliary LLC controller and a secondary rectification circuit of the auxiliary LLC controller;
the standby power supply circuit comprises a first end, a second end, a third end, a fourth end, a fifth end and a sixth end; the secondary rectifying circuit of the standby power supply circuit comprises a first end and a second end; the bridgeless PFC circuit comprises a first end, a second end and a third end; the auxiliary LLC controller comprises a first end, a second end and a third end; the secondary rectifying circuit of the auxiliary LLC controller comprises a first end, a second end and a third end;
the first end of the standby power supply circuit is coupled with the first end of the secondary rectifying circuit of the standby power supply circuit; a second end of a secondary rectifying circuit of the standby power supply circuit is used as a first end of the first power supply module; the second end of the standby power supply circuit is used as the second end of the first power supply module; the third end of the standby power supply circuit is used as the fifth end of the first power supply module; the fourth end of the standby power supply circuit is electrically connected with the first end of the auxiliary LLC controller; a fifth end of the standby power supply circuit is used as a seventh end of the first power supply module; the sixth end of the standby power supply circuit is electrically connected with the first end of the bridgeless PFC circuit; the second end of the PFC circuit is electrically connected with the second end of the auxiliary LLC controller; a third end of the PFC circuit is used as a sixth end of the first power supply module; the third end of the auxiliary LLC controller is coupled with the first end of the secondary rectification circuit of the auxiliary LLC controller; and the second end and the third end of the secondary rectifying circuit of the auxiliary LLC controller are respectively used as the third end and the fourth end of the first power supply module.
4. The driving power supply according to claim 2, wherein the second power supply module comprises: a primary LLC controller and a secondary rectification circuit of the primary LLC controller;
the main LLC controller comprises a first end, a second end and a third end; the secondary rectifying circuit of the main LLC controller comprises a first end, a second end and a third end;
a first end of the main LLC controller is used as a first end of the second power supply module; a second end of the main LLC controller is used as a second end of the second power supply module; the third end of the main LLC controller is coupled with the first end of the secondary rectification circuit of the main LLC controller; and the second end and the third end of the secondary rectifying circuit of the main LLC controller are respectively used as the third end and the fourth end of the second power supply module.
5. The driving power supply according to claim 1, wherein the preset delay time is equal to or greater than 30 milliseconds.
6. The driving power supply according to claim 1, wherein the first conversion module includes: the LLC controller and the last-stage rectifying circuit of the first screen are arranged on the first screen;
the first on-screen LLC controller comprises a first end, a second end and a third end; the first screen secondary rectifying circuit comprises a first end and a second end;
a first end and a second end of the first on-screen LLC controller are respectively used as a first end and a second end of the first conversion module; a third end of the LLC controller on the first screen is coupled with a first end of the last-stage rectification circuit of the first screen; and the second end of the first screen secondary rectifying circuit is used as the third end and the fourth end of the first conversion module.
7. The driving power supply according to claim 1, wherein the second conversion module comprises: an LLC controller and a last-stage rectifying circuit of the second screen are arranged on the second screen;
the second on-screen LLC controller comprises a first end, a second end, a third end and a fourth end; the second screen secondary rectifying circuit comprises a first end and a second end;
a first end, a second end and a third end of the second on-screen LLC controller are respectively used as a first end, a second end and a third end of the second conversion module; a fourth end of the LLC controller on the second screen is coupled with a first end of the last-stage rectification circuit of the second screen; and the second end of the second screen secondary rectifying circuit is used as the fourth end of the second conversion module.
8. The driving power supply according to any one of claims 1 to 7, wherein the main power supply board is electrically connected to an on-screen power supply board, and comprises: the main power panel is electrically connected with the on-screen power panel through the mainboard;
and the mainboard is used for generating a first enabling signal when the connection with the on-screen power supply board is detected to be normal.
9. An electronic product comprising the OLED driving power supply according to any one of claims 1 to 8 and an OLED panel, wherein an on-panel power supply board in the OLED driving power supply is disposed on the OLED panel.
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