CN109449914A - OLED display and its method of supplying power to - Google Patents
OLED display and its method of supplying power to Download PDFInfo
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- CN109449914A CN109449914A CN201811194505.0A CN201811194505A CN109449914A CN 109449914 A CN109449914 A CN 109449914A CN 201811194505 A CN201811194505 A CN 201811194505A CN 109449914 A CN109449914 A CN 109449914A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 277
- 230000000087 stabilizing effect Effects 0.000 claims description 20
- 230000015556 catabolic process Effects 0.000 claims description 11
- 239000003990 capacitor Substances 0.000 abstract description 70
- 230000002159 abnormal effect Effects 0.000 abstract description 11
- 230000005611 electricity Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 17
- 230000000903 blocking effect Effects 0.000 description 10
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/63—Generation or supply of power specially adapted for television receivers
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Abstract
It includes: master chip, power supply module, control circuit, voltage conversion circuit that the present invention, which provides a kind of OLED display and its method of supplying power to, the device,；Wherein, the output end of power supply module is connect with the input terminal of the input terminal of control circuit and voltage conversion circuit respectively, and the control terminal of control circuit and the enable end of voltage conversion circuit connect, and the output end of voltage conversion circuit and the feeder ear of master chip connect；Control circuit, when being greater than or equal to the minimum input voltage of the voltage conversion circuit for the output voltage in the power supply module and be less than predetermined voltage threshold, control voltage conversion circuit is not powered to master chip；Predetermined voltage threshold is less than or equal to the rated output voltage of power supply module.The technical issues of present invention is able to solve when the electrolytic capacitor electricity of power supply module is not vented, carries out quick turn-on operation to OLED TV, leads to the display abnormal phenomenon such as flower screen occurs in OLED TV, the screen that flashes black, screen picture block.
Description
Technical Field
The invention relates to the technical field of electronic equipment, in particular to an OLED display device and a power supply method thereof.
Background
Fig. 1 is a schematic diagram of a power supply circuit of a television provided in the prior art, and as shown in fig. 1, when the television is powered on by ac or dc, a power supply module may supply power to a display screen of the television (not shown in the figure), and a current path between the power supply module and a voltage conversion chip may be conducted according to a high-level control signal sent by a main chip. The voltage conversion chip in the power supply circuit includes an input pin and an enable pin, and when an input voltage of the input pin of the voltage conversion chip (i.e., an output voltage of the power supply module) is greater than or equal to a minimum input voltage of the voltage conversion chip and the input voltage of the enable pin of the voltage conversion chip is greater than the minimum enable voltage (i.e., the voltage conversion chip is enabled), the voltage conversion chip enters a working state. At this time, the voltage conversion chip can convert the output voltage of the power supply module into the power supply voltage of the main chip and output the power supply voltage to the main chip, so that the purpose of supplying power to the main chip is achieved. Wherein the minimum enable voltage is less than the minimum input voltage.
Fig. 2 is a schematic voltage waveform diagram of a power supply circuit of a television in the prior art when a main chip supplies power, as shown in fig. 2, when the television is powered off by ac or dc, the output voltage of a power supply module will drop rapidly. Even if the television is subjected to a power-on operation (i.e., a fast power-on operation), the output voltage of the power supply module is already lower than the minimum input voltage of the voltage conversion chip and the minimum enabling voltage of the voltage conversion chip in most cases. Since the output voltage of the power supply module needs a certain time (usually more than 200ms) to rise to the minimum input voltage of the voltage conversion chip, before the power supply module reaches the minimum input voltage of the voltage conversion chip, that is, when the requirement of the voltage conversion chip on the input voltage cannot be met, even if the control signal is set high (that is, the control signal of high level) and the voltage conversion chip is enabled, the voltage conversion chip does not work, that is, the power supply is not supplied to the main chip.
Currently, more and more television manufacturers use an OLED (Organic Light-Emitting Diode) display as a display screen of a television, and the television using the OLED display is referred to as an OLED television. In order to protect the OLED display screen, the power supply circuit of the OLED television adds a large amount of electrolytic capacitors to the power supply module based on the existing circuit shown in fig. 1. Therefore, after the OLED television is powered off by alternating current or direct current, the power supply module can discharge through the electrolytic capacitor to output voltage so as to continuously supply power to the OLED display screen for a period of time (generally more than 30 ms). Fig. 3 is a schematic voltage waveform diagram of a power supply circuit of an OLED television in the prior art when the power supply circuit supplies power to a main chip. As shown in fig. 3, in this scenario, after the ac or dc power of the OLED television is cut off, the output voltage of the power supply module with a large number of electrolytic capacitors may slowly decrease. At this time, before the electric quantity of the electrolytic capacitor is discharged, if the OLED television is turned on (i.e., a fast turn-on operation), the power supply module still outputs the voltage through the discharge of the electrolytic capacitor.
If the voltage output by the power supply module through the discharging of the electrolytic capacitor is higher than the minimum input voltage and the minimum enabling voltage of the voltage conversion chip, namely the voltage output by the power supply module can meet the requirement of the voltage conversion chip on the input voltage and enable the voltage conversion chip, the voltage conversion chip can supply power to the main chip under the triggering of a high-level control signal sent by the main chip. The voltage conversion chip supplies power to the main chip to accelerate the discharge of the electrolytic capacitor of the power supply module, so that the output voltage of the power supply module can be rapidly reduced. At this moment, if the voltage output by the power supply module through the electrolytic capacitor discharge is lower than the minimum input voltage of the voltage conversion chip, no matter whether the voltage conversion chip is enabled or not, the voltage conversion chip does not work, that is, the power supply to the main chip cannot be realized, so that the main chip suddenly loses power in the working process (shown as a dashed line frame 301 in fig. 3), and further, the display abnormal phenomena such as screen splash, screen flash, screen image blocking and the like occur in the OLED television, and the user experience is low.
Disclosure of Invention
The invention provides an OLED display device and a power supply method thereof, which are used for solving the technical problem that the OLED television has abnormal display phenomena such as screen splash, screen splash and screen image blocking due to the fact that the OLED television is rapidly started when the electrolytic capacitor electric quantity of a power supply module is not discharged.
A first aspect of the present invention provides an OLED display device including: the power supply circuit comprises a main chip, a power supply module, a control circuit and a voltage conversion circuit; wherein,
the output end of the power supply module is respectively connected with the input end of the control circuit and the input end of the voltage conversion circuit, the control end of the control circuit is connected with the enabling end of the voltage conversion circuit, and the output end of the voltage conversion circuit is connected with the power supply end of the main chip;
the control circuit is used for controlling the voltage conversion circuit not to supply power to the main chip when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than a preset voltage threshold; the preset voltage threshold is less than or equal to the rated output voltage of the power supply module.
Optionally, the control circuit includes: a voltage regulator diode;
the negative electrode of the voltage stabilizing diode is connected with the output end of the power supply module, the positive electrode of the voltage stabilizing diode is connected with the enabling end of the voltage conversion circuit, and the reverse breakdown voltage of the voltage stabilizing diode is equal to the preset voltage threshold value;
when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than a preset voltage threshold, controlling the voltage conversion circuit not to supply power to the main chip, specifically:
the voltage stabilizing diode is cut off, so that no input voltage exists at the enabling end of the voltage conversion circuit.
Optionally, the control circuit includes: a first resistor and a second resistor;
the first end of the first resistor is connected with the output end of the power supply module, the second end of the first resistor is respectively connected with the enabling end of the voltage conversion circuit and the first end of the second resistor, and the second end of the second resistor is grounded;
the resistance value of the first resistor is larger than that of the second resistor;
when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than a preset voltage threshold, controlling the voltage conversion circuit not to supply power to the main chip, specifically:
the voltage of the second end of the first resistor is smaller than the minimum enabling voltage of the voltage conversion circuit.
Optionally, the resistance value of the first resistor is twice the resistance value of the second resistor.
Optionally, the OLED display device further includes: a switching circuit;
the output end of the power supply module is respectively connected with the input end of the control circuit and the input end of the voltage conversion circuit through the switch circuit, and the control end of the main chip is connected with the switch circuit;
the switching circuit is used for switching on or off a current path between the power supply module and the voltage conversion circuit and a current path between the power supply module and the control circuit according to a control signal sent by the main chip.
Optionally, the switching circuit includes: a third resistor, a switch and an MOS tube;
the first end of the third resistor is connected with the control end of the main chip, the second end of the third resistor is connected with the first end of the switch, the second end of the switch is grounded, the third end of the switch is connected with the grid electrode of the MOS tube, the source electrode of the MOS tube is connected with the power supply module, and the drain electrode of the MOS tube is respectively connected with the input end of the control circuit and the input end of the voltage conversion circuit.
Optionally, the switching circuit further includes: a fourth resistor;
the first end of the fourth resistor is connected with the power supply module, and the second end of the fourth resistor is connected with the grid electrode of the MOS tube.
Optionally, the switching circuit further includes: a fifth resistor;
the first end of the fifth resistor is connected with the third end of the switch, and the second end of the fifth resistor is connected with the grid electrode of the MOS tube.
Optionally, the switch is a triode;
the base electrode of the triode is the first end of the switch, the emitter electrode of the triode is the second end of the switch, and the collector electrode of the triode is the third end of the switch.
Optionally, the voltage conversion circuit includes: a voltage conversion chip;
an input pin of the voltage conversion chip is connected with an output end of the power supply module, an enable pin of the voltage conversion chip is connected with a control end of the control circuit, and an output pin of the voltage conversion chip is connected with a power supply end of the main chip.
Optionally, the voltage conversion circuit further includes: a capacitor;
the first end of the capacitor is connected with an output pin of the voltage conversion chip, and the second end of the capacitor is grounded.
A second aspect of the present invention provides a method of supplying power to an OLED display device, the method including:
receiving the output voltage of the power supply module;
when the output voltage is greater than or equal to the minimum input voltage of the voltage conversion circuit and less than a preset voltage threshold, controlling the voltage conversion chip not to supply power to a main chip of the OLED display device; the preset voltage threshold is less than or equal to the rated output voltage of the power supply module.
Optionally, when the output voltage is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than a preset voltage threshold, controlling the voltage conversion circuit not to supply power to the main chip of the OLED display device includes:
and when the output voltage is greater than or equal to the minimum input voltage of the voltage conversion circuit and less than a preset voltage threshold, not inputting the voltage to the enabling end of the voltage conversion chip so as to enable the voltage conversion circuit not to work.
Optionally, when the output voltage is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than a preset voltage threshold, controlling the voltage conversion circuit not to supply power to the main chip of the OLED display device includes:
not inputting a voltage to an enable terminal of the voltage conversion chip; or inputting a first voltage to an enable terminal of the voltage conversion chip, wherein the first voltage is less than the minimum enable voltage of the voltage conversion chip.
According to the OLED display device and the power supply method thereof provided by the invention, the working condition of the voltage conversion circuit is that the input voltage of the input end of the voltage conversion circuit is greater than or equal to the minimum input voltage, and the input voltage of the enabling end of the voltage conversion circuit is greater than or equal to the minimum enabling voltage, wherein the minimum enabling voltage is less than the minimum input voltage. Therefore, when the OLED television is rapidly started, even if the voltage output by the power supply module through the discharge of the electrolytic capacitor is greater than or equal to the minimum input voltage of the voltage conversion circuit, the voltage output by the power supply module through the discharge of the electrolytic capacitor meets the requirements of the voltage conversion circuit on the minimum input voltage and the minimum enabling voltage. However, the control circuit may disable the voltage conversion circuit, that is, not supply power to the main chip, by inputting no voltage to the enable terminal of the voltage conversion circuit or inputting a voltage smaller than the minimum enable voltage to the enable terminal of the voltage conversion circuit so that the input voltage of the enable terminal of the voltage conversion circuit does not satisfy the requirement of the minimum enable voltage.
Through the mode, when the OLED television is started quickly, the phenomenon that the voltage conversion circuit works due to the fact that the power supply module discharges through the electrolytic capacitor can be avoided, and power is supplied to the main chip, then in the working process of the main chip, the power supply quantity is reduced due to the electrolytic capacitor, the voltage output by the power supply module through the electrolytic capacitor is gradually lower than the minimum input voltage of the voltage conversion circuit, the voltage conversion circuit cannot supply power to the main chip, the main chip is in power failure suddenly in the working process, abnormal display phenomena such as screen splash, screen blackout, screen image blocking and the like of the OLED television can be avoided, and user experience is improved.
Drawings
Fig. 1 is a schematic diagram of a power supply circuit of a television provided in the prior art;
fig. 2 is a first voltage waveform diagram when a power supply circuit of a television in the prior art supplies power to a main chip;
fig. 3 is a schematic voltage waveform diagram ii when the power supply circuit of the OLED television in the prior art supplies power to the main chip;
FIG. 4 is a schematic structural diagram of an OLED display device according to the present invention;
FIG. 5 is a schematic voltage waveform diagram of the OLED display device of the present invention when supplying power to the main chip;
FIG. 6 is a schematic view of another OLED display device provided in the present invention;
FIG. 7 is a schematic view of another OLED display device according to the present invention;
fig. 8 is a schematic flow chart of a power supply method of an OLED display device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the 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.
The invention provides an OLED display device which is used for solving the technical problem that the OLED television has abnormal display phenomena such as screen splash, screen flashing, screen image blocking and the like due to the fact that the electrolytic capacitor electric quantity of a power supply module is not discharged when the OLED television is rapidly started.
For the sake of facilitating understanding of the present invention, the following description will be made of a voltage conversion circuit according to the present invention, specifically:
the voltage conversion circuit comprises an input end, an output end and an enabling end. The working conditions of the voltage conversion circuit are as follows: the input voltage of the input end is larger than or equal to the minimum input voltage, and the input voltage of the enabling end is larger than or equal to the minimum enabling voltage.
That is, when the input voltage at the input terminal of the voltage conversion circuit is greater than or equal to the minimum input voltage of the voltage conversion circuit and the input voltage at the enable terminal of the voltage conversion circuit is greater than or equal to the minimum enable voltage of the voltage conversion circuit (i.e., when the operating condition of the voltage conversion circuit is satisfied), the voltage conversion circuit starts to operate. Wherein the minimum enable voltage is less than the minimum input voltage.
When the input voltage of the input end of the voltage conversion circuit is smaller than the minimum input voltage of the voltage conversion circuit, and/or the enable voltage of the enable end of the voltage conversion circuit is smaller than the minimum enable voltage of the voltage conversion circuit (namely, when the working condition of the voltage conversion circuit is not met), the voltage conversion circuit stops working.
The technical solution of the present invention will be described in detail with reference to specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 4 is a schematic structural diagram of an OLED display device provided in the present invention. As shown in fig. 4, the OLED display device includes: the power supply circuit comprises a main chip, a power supply module, a control circuit and a voltage conversion circuit; wherein, a large number of electrolytic capacitors are arranged in the power supply module. The OLED display device can be an OLED television, and the main chip can be the main chip of the OLED television.
The output end of the power supply module is respectively connected with the input end of the control circuit and the input end of the voltage conversion circuit, the control end of the control circuit is connected with the enabling end of the voltage conversion circuit, and the output end of the voltage conversion circuit is connected with the power supply end of the main chip.
And the control circuit is used for controlling whether the voltage conversion circuit works or not according to the output voltage of the power supply module. Namely, whether the voltage conversion circuit supplies power to the main chip is controlled.
Specifically, the control circuit controls the voltage conversion circuit not to supply power to the main chip when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than a preset voltage threshold. Namely, the voltage conversion circuit is controlled not to operate. For example, the control circuit may disable the voltage conversion circuit by not inputting a voltage to the enable terminal of the voltage conversion circuit, or inputting a voltage smaller than the minimum enable voltage to the enable terminal of the voltage conversion circuit, so that the input voltage of the enable terminal of the voltage conversion circuit does not meet the requirement of the minimum enable voltage. The preset voltage threshold value can be less than or equal to the rated output voltage of the power supply module.
And the control circuit controls the voltage conversion circuit to supply power to the main chip when the output voltage of the power supply module is greater than or equal to a preset voltage threshold value. Namely, the voltage conversion circuit is controlled to operate. For example, the control circuit may operate the voltage conversion circuit by inputting a voltage greater than or equal to a minimum enable voltage to an enable terminal of the voltage conversion circuit so that the input voltage of the enable terminal of the voltage conversion circuit meets a requirement of the minimum enable voltage.
It can be understood that, since the minimum enabling voltage of the voltage conversion circuit is less than the minimum input voltage, when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than the preset voltage threshold, it indicates that the output voltage of the power supply module meets the requirements of the voltage conversion circuit on the minimum input voltage and the minimum enabling voltage, that is, the output voltage of the power supply module meets the operating conditions of the voltage conversion circuit.
Therefore, in the embodiment, when the output voltage of the power supply module meets the operating condition of the voltage conversion circuit, the control circuit can control whether the voltage conversion circuit operates or not. When the voltage conversion circuit is controlled to work, the voltage conversion circuit can convert the input voltage into the power supply voltage of the main chip and output the power supply voltage to the main chip so as to supply power to the main chip. When the voltage conversion circuit is controlled not to work, even if the output voltage of the power supply module meets the working condition of the voltage conversion circuit, the voltage conversion circuit cannot convert the input voltage into the power supply voltage of the main chip, namely, the power supply cannot be supplied to the main chip.
Fig. 5 is a schematic voltage waveform diagram of the OLED display device of the present invention when supplying power to the main chip. As shown in fig. 5, after the Alternating Current (AC) or Direct Current (DC) of the OLED television is powered down, the power supply module in the OLED display device outputs voltage by discharging the electrolytic capacitor. Before the power of the electrolytic capacitor of the power supply module is discharged, if a power-on operation (short for quick power-on operation) is performed on the OLED television, that is, AC power or DC power is applied to the OLED television, since the output voltage of the power supply module needs a certain time (usually more than 200ms) to be increased to the minimum input voltage of the voltage conversion circuit, at this time, the power supply module still discharges through the electrolytic capacitor to output the voltage.
In this embodiment, even when the power supply module is powered on by the OLED television AC or DC, the voltage output by discharging through the electrolytic capacitor is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than a preset voltage threshold (because the minimum enabling voltage of the voltage conversion circuit is less than the minimum input voltage, when the voltage output by discharging through the electrolytic capacitor of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than the preset voltage threshold, it is indicated that the voltage output by discharging through the electrolytic capacitor of the power supply module meets the requirements of the voltage conversion circuit on the minimum input voltage and the minimum enabling voltage, namely the voltage output by discharging through the electrolytic capacitor of the power supply module meets the working conditions of the voltage conversion circuit), and the control circuit can control the voltage conversion circuit not to supply power to the main chip until the output voltage of the power supply module rises to the preset voltage threshold. Therefore, the voltage conversion circuit can be prevented from working before the output voltage of the power supply module rises to the preset voltage threshold value.
Therefore, the situation that the main chip suddenly loses power in the working process due to the fact that the voltage output by the power supply module through the electrolytic capacitor is gradually lower than the minimum input voltage of the voltage conversion circuit in the working process of the voltage conversion circuit can be avoided, the phenomenon that an OLED television is abnormal in display such as screen splash, screen flash, screen image blocking and the like can be avoided, and user experience is improved.
In a specific implementation, the control circuit may include the following two implementation manners, specifically:
the first implementation mode comprises the following steps: fig. 6 is a schematic view of another OLED display device provided in the present invention. As shown in fig. 6, the control circuit of the OLED display device may include: a voltage regulator diode;
the negative electrode of the voltage stabilizing diode is connected with the output end of the power supply module, the positive electrode of the voltage stabilizing diode is connected with the enabling end of the voltage conversion circuit, and the reverse breakdown voltage of the voltage stabilizing diode is equal to the preset voltage threshold value. That is, when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than the preset voltage threshold, the zener diode is turned off, so that no input voltage exists at the enable end of the voltage conversion circuit.
In particular, since the zener diode has a high resistance until it reaches the reverse breakdown voltage. Therefore, by selecting the voltage stabilizing diode with the reverse breakdown voltage equal to the preset voltage threshold, the voltage stabilizing diode can be in a cut-off state before the output voltage of the power supply module reaches the preset voltage threshold.
When the output voltage of the power supply module reaches the preset voltage threshold, the reverse breakdown voltage of the voltage stabilizing diode is reached, the voltage stabilizing diode is broken down, the voltage input is provided at the enabling end of the voltage conversion circuit, the enabling condition is met, the voltage conversion circuit can work normally, and the starting of the display device is not influenced.
That is, when the OLED television is rapidly turned on, even if the power supply module is turned on (i.e., AC power-on or DC power-on) the OLED television, the voltage discharged and output through the electrolytic capacitor is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than the preset voltage threshold (since the minimum enabling voltage of the voltage conversion circuit is less than the minimum input voltage, when the voltage discharged and output through the electrolytic capacitor of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than the preset voltage threshold, it indicates that the voltage discharged and output through the electrolytic capacitor of the power supply module satisfies the requirements of the voltage conversion circuit for the minimum input voltage and the minimum enabling voltage, i.e., the voltage discharged and output through the electrolytic capacitor of the power supply module satisfies the operating conditions of the voltage conversion circuit), but through the cut-off zener diode, the enabling terminal of the voltage conversion circuit can have no input, therefore, the voltage conversion circuit can be controlled not to work until the output voltage of the power supply module rises to the preset voltage threshold. Therefore, the voltage conversion circuit can be prevented from working before the output voltage of the power supply module rises to the preset voltage threshold value.
It can be understood that the voltage output by the discharge of the electrolytic capacitor of the power supply module changes with time and becomes lower, that is, the shorter the time from the shutdown to the startup of the OLED television is, the higher the voltage output by the discharge of the electrolytic capacitor of the power supply module is. Therefore, the time from the shutdown to the rapid startup of the OLED television can be further shortened by selecting the voltage stabilizing diode with higher reverse breakdown voltage.
The second implementation mode comprises the following steps: fig. 7 is a schematic view of another OLED display device provided in the present invention. As shown in fig. 7, the control circuit of the OLED display device may include: a first resistor R1 and a second resistor R2;
a first end of the first resistor R1 is connected to an output end of the power supply module, a second end of the first resistor R1 is connected to an enable end of the voltage conversion circuit and a first end of the second resistor R2, and a second end of the second resistor R2 is grounded.
The resistance value of the first resistor R1 is larger than that of the second resistor R2.
In this embodiment, when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than the preset voltage threshold, the voltage of the second end of the first resistor R1 is less than the minimum enable voltage of the voltage conversion circuit.
That is, when the OLED television is rapidly turned on, even if the voltage output by the power supply module through the electrolytic capacitor during the OLED television is turned on (i.e. AC power-on or DC power-on) is greater than or equal to the minimum input voltage of the voltage conversion circuit and less than the preset voltage threshold (since the minimum enabling voltage of the voltage conversion circuit is less than the minimum input voltage, when the voltage output by the power supply module through the electrolytic capacitor during the discharge is greater than or equal to the minimum input voltage of the voltage conversion circuit and less than the preset voltage threshold, it indicates that the voltage output by the power supply module through the electrolytic capacitor during the discharge meets the requirements of the voltage conversion circuit for the minimum input voltage and the minimum enabling voltage, i.e. the voltage output by the power supply module through the electrolytic capacitor during the discharge meets the operating condition of the voltage conversion circuit), but the voltage at the second end of the first resistor R1 can be less than the minimum enabling voltage of the voltage conversion circuit through the voltage division of the first resistor R1 and the second, therefore, the voltage conversion circuit can be controlled not to work until the output voltage of the power supply module rises to the preset voltage threshold. Therefore, the voltage conversion circuit can be prevented from working before the output voltage of the power supply module rises to the preset voltage threshold value.
The values of the first resistor R1 and the second resistor R2 may be determined according to a voltage value of an enable signal of the voltage conversion circuit and an output voltage output by the power supply module through discharging of the electrolytic capacitor when the OLED display device is turned on. For example, the resistance of the first resistor R1 is twice the resistance of the second resistor R2. Alternatively, the resistance of the first resistor R1 is three times the resistance of the second resistor R2.
The larger the difference between the resistance of the first resistor R1 and the resistance of the second resistor R2, the higher the voltage can be pulled down by the first resistor R1. When the OLED television is started, even if the output voltage output by the power supply module through the discharge of the electrolytic capacitor is very high, the purpose of controlling the voltage conversion circuit not to work can be achieved by enabling the voltage of the second end of the first resistor R1 to be smaller than the minimum enabling voltage of the voltage conversion circuit.
The voltage output by the discharging of the electrolytic capacitor of the power supply module is lower and lower along with the change of time, namely, the shorter the time from the shutdown to the startup, the higher the voltage output by the discharging of the electrolytic capacitor of the power supply module is. Therefore, the time from the power-off to the fast power-on of the OLED television can be shortened by increasing the resistance between the first resistor R1 and the second resistor R2.
With continued reference to fig. 6 or 7, the above-described OLED display device may further include: a switching circuit; the output end of the power supply module is respectively connected with the input end of the control circuit and the input end of the voltage conversion circuit through the switch circuit, and the control end of the main chip is connected with the switch circuit;
the switching circuit is used for switching on or off a current path between the power supply module and the voltage conversion circuit and a current path between the power supply module and the control circuit according to a control signal sent by the main chip.
For example, when the control signal sent by the main chip is a high-level control signal, the current path between the power supply module and the voltage conversion circuit is conducted, and the current path between the power supply module and the control circuit is conducted. And when the control signal sent by the main chip is a low-level control signal, disconnecting the current path between the power supply module and the voltage conversion circuit, and disconnecting the current path between the power supply module and the control circuit.
In a specific implementation, the switching circuit of the OLED display device may include: a third resistor R3, a switch and a MOS tube;
the first end of the third resistor R3 is connected with the control end of the main chip, the second end of the third resistor R3 is connected with the first end of the switch, the second end of the switch is grounded, the third end of the switch is connected with the grid G of the MOS tube, the source S of the MOS tube is connected with the power supply module, and the drain D of the MOS tube is respectively connected with the input end of the control circuit and the input end of the voltage conversion circuit.
Specifically, when a control command of a high-level signal is received, the third resistor R3 divides the high-level signal to reduce the voltage of the high-level signal, so that the switch is turned on and is prevented from being damaged by an excessive voltage. The switch after switching on can make the grid G ground connection of MOS pipe, and then has reached the purpose of drawing down the voltage of the grid G of MOS pipe to make the voltage of the grid G of MOS pipe be less than the voltage of the source S of MOS pipe, make the MOS pipe switch on. Therefore, after the main chip sends a high-level control instruction, the power supply module can supply voltage to the voltage conversion circuit and the control circuit which are connected with the drain electrode D of the MOS tube through the source electrode S of the MOS tube.
And when a control command of a low level signal is received, the switch is turned off. The switch after being switched off turns off the MOS tube. At this time, the power supply module cannot supply voltage to the voltage conversion circuit and the control circuit connected to the drain electrode D of the MOS transistor through the source electrode S of the MOS transistor.
It is understood that the MOS transistor may be a PMOS transistor, for example. In particular, other MOS transistors having on or off current paths, such as NMOS transistors, may be used. When the NMOS transistor is used, the connection relationship of the NMOS transistor in the above-described device may be adjusted according to the operating principle of the NMOS transistor, which is not limited.
With continuing reference to fig. 6 or 7, optionally, in another implementation of the present invention, the switching circuit may further include; a fourth resistor R4; the first end of the fourth resistor R4 is connected with the power supply module, and the second end of the fourth resistor R4 is connected with the grid G of the MOS transistor. With this arrangement, a path can be formed between the fourth resistor R4 and the switch when the switch is turned on. Because the grid G and the source S of the MOS tube are respectively connected with two ends of the fourth resistor R4, and the fourth resistor R4 has voltage drop, the grid G and the source S of the MOS tube have voltage difference, and the MOS tube can be conducted.
With continuing reference to fig. 6 or 7, optionally, in another implementation of the present invention, the switching circuit may further include: the first end of the fifth resistor R5 is connected with the third end of the switch, and the second end of the fifth resistor R5 is connected with the gate G of the MOS transistor, so that the fourth resistor R4 and the fifth resistor R5 can share the voltage output by the power supply module together, and the purpose of pulling down the voltage of the gate G of the MOS transistor and conducting the MOS transistor is achieved.
With continued reference to fig. 6 or 7, the switch in the switching circuit may be any switch capable of conducting when the operating voltage is satisfied, for example: triodes, MOS transistors, etc. Optionally, when the switch is a triode, the base B of the triode is the first end of the switch, the emitter E of the triode is the second end of the switch, and the collector C of the triode is the third end of the switch. Optionally, when the switch is an MOS transistor, the gate G of the MOS transistor is a first end of the switch, the source S of the MOS transistor is a second end of the switch, and the drain D of the MOS transistor is a third end of the switch. The switching circuit shown in fig. 6 or 7 is an OLED display device with a switch as an example.
It is understood that the transistor may be an NPN transistor, for example. In particular, other transistors, such as PNP transistors, may be used. When the PNP triode is adopted, the connection relation of the PNP triode in the device can be adjusted according to the working principle of the PNP triode, and the connection relation is not limited. The MOS transistor may be, for example, an NMOS transistor. In particular, other MOS transistors, such as PMOS transistors, may also be used. When the PMOS transistor is used, the connection relationship of the PMOS transistor in the above device can be adjusted according to the operating principle of the PMOS transistor, which is not limited.
With continued reference to fig. 6 or 7, the voltage conversion circuit of the OLED display device may include: a voltage conversion chip;
an input pin VIN of the voltage conversion chip is connected with an output end of the power supply module, an enable pin EN of the voltage conversion chip is connected with a control end of the control circuit, and an output pin VOUT of the voltage conversion chip is connected with a power supply end of the main chip. If the OLED display device comprises the switch circuit, the input pin VIN of the voltage conversion chip is connected with the output end of the power supply module through the switch circuit.
The voltage conversion chip can be a boost conversion chip or a buck conversion chip, and can be determined according to the rated output voltage of the power supply module and the power supply voltage required by the main chip.
Optionally, the voltage conversion circuit may further include: a capacitor C;
the first end of the capacitor C is connected with an output pin VOUT of the voltage conversion chip, and the second end of the capacitor C is grounded.
The voltage output by the voltage conversion chip can be filtered through the capacitor C.
The OLED display device provided by the present invention is described below with reference to fig. 6 or fig. 7 by a specific example.
The OLED display device provided by the present invention is described below by using two cases of dc power-up and ac power-up of the OLED television, respectively.
The method comprises the following steps of (1) a direct current power-off process (namely an OLED television standby process) and a direct current power-on process of the OLED television:
after receiving a shutdown command sent by a user through a remote controller, a main chip of the OLED television outputs a low-level control signal. At this time, the switch is turned off, and the source S and the gate G of the MOS transistor have the same voltage. The MOS tube can be conducted only when a voltage difference exists between the source S and the grid G, so that the MOS tube is in an off state. That is, the power supply module does not supply the input voltage to the voltage conversion chip and the control circuit.
At this time, the input voltage of the voltage conversion chip and the control circuit is at a low level (the low level is less than the minimum input voltage of the voltage conversion chip), and the voltage output to the enable pin EN of the voltage conversion chip by the control circuit is at a low level (the low level is less than the minimum enable voltage of the voltage conversion chip). In this scenario, the voltage conversion chip stops working, that is, the power supply to the main chip is stopped, so that the main chip stops working, and the OLED television enters a standby state. After the OLED display enters the standby state, the power supply module discharges through the electrolytic capacitor to output a voltage, so as to continuously supply power to the OLED display for a period of time (for example, 30 ms).
After the OLED television enters a standby state and before the electric quantity of an electrolytic capacitor of the power supply module is discharged, if the main chip receives a power-on command sent by a user through a remote controller (namely, the OLED television is quickly powered on), the main chip outputs a high-level control signal to turn on the switch. At this time, a path is formed between the fourth resistor R4, the fifth resistor R5, and the switch. Due to the voltage drop of the fourth resistor R4, a voltage difference exists between the source S and the gate G of the MOS transistor respectively connected with the two ends of the fourth resistor R4, and the MOS transistor is turned on. Namely, the power supply module can provide voltage to the voltage conversion chip through the MOS tube and provide voltage to the control circuit.
When the OLED television is rapidly turned on, the power supply module needs a period of time (e.g., 200ms) to reach the minimum input voltage of the voltage conversion chip. Therefore, the power supply module still discharges through the electrolytic capacitor to output voltage before reaching the minimum input voltage of the voltage conversion chip. At this time, if the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion chip and less than the preset voltage threshold (because the minimum enabling voltage of the voltage conversion chip is less than the minimum input voltage, when the voltage that the power supply module discharges through the electrolytic capacitor is greater than or equal to the minimum input voltage of the voltage conversion chip and less than the preset voltage threshold, it indicates that the voltage that the power supply module discharges through the electrolytic capacitor meets the requirements of the voltage conversion chip on the minimum input voltage and the minimum enabling voltage, that is, the voltage that the power supply module discharges through the electrolytic capacitor meets the operating conditions of the voltage conversion chip), then, through the control circuit, no voltage can be input to the enable pin EN of the voltage conversion chip, or inputting a voltage smaller than the minimum enable voltage of the voltage conversion chip to make the voltage conversion chip not work. In this way, even if the output voltage of the power supply module is higher than the minimum input voltage and the minimum enable voltage of the voltage conversion chip (i.e. the working condition of the voltage conversion chip is met), the control circuit can still control the voltage conversion chip not to work, i.e. the power is not supplied to the main chip.
Therefore, before the power supply module reaches the preset voltage threshold value, the voltage conversion chip can be prevented from supplying power to the main chip, and the main chip can be prevented from working. Through the mode, the situation that the voltage conversion chip cannot supply power to the main chip and the main chip suddenly loses power in the working process due to the fact that the voltage output by the power supply module through the electrolytic capacitor is gradually lower than the minimum input voltage of the voltage conversion chip in the working process of the voltage conversion chip can be avoided, abnormal display phenomena such as screen splash, screen flash, screen image blocking and the like of the OLED television can be further avoided, and user experience is improved.
When the output voltage of the power supply module is higher than the preset voltage threshold, namely the power supply module gradually recovers to normal power supply, the control circuit can input the voltage which is larger than the minimum enabling voltage to the enabling pin EN of the voltage conversion chip, so that the voltage conversion chip can provide the power supply voltage for the main chip based on the output voltage of the power supply module, and the main chip starts to work.
Further, the voltage output by the discharging of the electrolytic capacitor of the power supply module is lower and lower along with the change of time, that is, the shorter the time from the shutdown to the startup, the higher the voltage output by the discharging of the electrolytic capacitor of the power supply module is. Therefore, when the control circuit is implemented by the first resistor R1 and the second resistor R2, the time from the turning off of the OLED television to the fast turning on of the OLED television can be shortened by increasing the resistance between the first resistor R1 and the second resistor R2. For example, the resistance value of the first resistor R1 is twice or three times the resistance value of the second resistor R2, and the like. When the control circuit is realized by the voltage stabilizing diode, the time from the shutdown to the rapid startup of the OLED television can be shortened by selecting the voltage stabilizing diode with high reverse breakdown voltage. For example, a zener diode with a reverse breakdown voltage of 9.1V is selected.
The method comprises the following steps of an OLED television AC power-down process and an AC power-up process:
when the OLED television is powered off, the main chip outputs a low-level control signal. At this time, the switch is turned off, and the MOS tube is in an off state. That is, the power supply module does not supply the input voltage to the voltage conversion chip and the control circuit. At this time, the voltage conversion chip of the voltage conversion chip stops operating, and the main chip stops operating.
After the alternating current of the OLED television is cut off, the power supply module discharges through the electrolytic capacitor to output voltage, so as to continuously supply power to the OLED display screen for a period of time (for example, 30 ms).
Before the power of the electrolytic capacitor of the power supply module is discharged, if a user carries out alternating current electrification on the OLED television (namely, the OLED television is quickly started), the main chip can output a high-level control signal to conduct the switch. At this time, a path is formed between the fourth resistor R4, the fifth resistor R5, and the switch. Due to the voltage drop of the fourth resistor R4, a voltage difference exists between the source S and the gate G of the MOS transistor respectively connected with the two ends of the fourth resistor R4, and the MOS transistor is turned on. Namely, the power supply module can provide voltage to the voltage conversion chip through the MOS tube and provide voltage to the control circuit.
When the OLED television is turned on (i.e., ac powered), the power supply module needs a period of time (e.g., 200ms) to reach the minimum input voltage of the voltage conversion chip. Therefore, the power supply module still discharges through the electrolytic capacitor to output voltage before reaching the minimum input voltage of the voltage conversion chip. At this time, if the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion chip and less than the preset voltage threshold (because the minimum enabling voltage of the voltage conversion chip is less than the minimum input voltage, when the voltage that the power supply module discharges through the electrolytic capacitor is greater than or equal to the minimum input voltage of the voltage conversion chip and less than the preset voltage threshold, it indicates that the voltage that the power supply module discharges through the electrolytic capacitor meets the requirements of the voltage conversion chip on the minimum input voltage and the minimum enabling voltage, that is, the voltage that the power supply module discharges through the electrolytic capacitor meets the operating conditions of the voltage conversion chip), then, through the control circuit, no voltage can be input to the enable pin EN of the voltage conversion chip, or inputting a voltage smaller than the minimum enable voltage of the voltage conversion chip to make the voltage conversion chip not work. In this way, even if the output voltage of the power supply module is higher than the minimum input voltage and the minimum enable voltage of the voltage conversion chip (i.e. the working condition of the voltage conversion chip is satisfied), the control circuit can control the voltage conversion chip not to work, i.e. not to supply power to the main chip.
Therefore, before the power supply module reaches the preset voltage threshold value, the voltage conversion chip can be prevented from supplying power to the main chip, and the main chip can be prevented from working. Through the mode, the situation that the voltage conversion chip cannot supply power to the main chip and the main chip suddenly loses power in the working process due to the fact that the voltage output by the power supply module through the electrolytic capacitor is gradually lower than the minimum input voltage of the voltage conversion chip in the working process of the voltage conversion chip can be avoided, abnormal display phenomena such as screen splash, screen flash, screen image blocking and the like of the OLED television can be further avoided, and user experience is improved.
When the output voltage of the power supply module is higher than the preset voltage threshold, namely the power supply module gradually recovers to normal power supply, the control circuit can input the voltage which is larger than the minimum enabling voltage to the enabling pin EN of the voltage conversion chip, so that the voltage conversion chip can provide the power supply voltage for the main chip based on the output voltage of the power supply module, and the main chip starts to work.
Further, the voltage output by the discharging of the electrolytic capacitor of the power supply module is lower and lower along with the change of time, that is, the shorter the time from the shutdown to the startup, the higher the voltage output by the discharging of the electrolytic capacitor of the power supply module is. Therefore, when the control circuit is implemented by the first resistor R1 and the second resistor R2, the time from the turning off of the OLED television to the fast turning on of the OLED television can be shortened by increasing the resistance between the first resistor R1 and the second resistor R2. For example, the resistance value of the first resistor R1 is twice or three times the resistance value of the second resistor R2, and the like. When the control circuit is realized by the voltage stabilizing diode, the time from the shutdown to the rapid startup of the OLED television can be shortened by selecting the voltage stabilizing diode with high reverse breakdown voltage. For example, a zener diode with a reverse breakdown voltage of 9.1V is selected.
Therefore, according to the OLED display device provided by the invention, when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion chip and is less than the preset voltage threshold, a user can carry out quick start-up operation on the OLED television, abnormal display phenomena such as screen splash, screen flash, screen image blocking and the like of the OLED television can be avoided, the function of quick start-up of the OLED television is realized, and the user experience is improved.
In the OLED display device provided by the present invention, since the operating condition of the voltage converting circuit is that the input voltage at the input end of the voltage converting circuit is greater than or equal to the minimum input voltage, and the input voltage at the enable end of the voltage converting circuit is greater than or equal to the minimum enable voltage, wherein the minimum enable voltage is less than the minimum input voltage, when the OLED television is rapidly turned on, even if the voltage output by the power supply module discharging through the electrolytic capacitor is greater than or equal to the minimum input voltage of the voltage converting circuit, i.e. the voltage output by the power supply module discharging through the electrolytic capacitor meets the requirements of the voltage converting circuit for the minimum input voltage and the minimum enable voltage, the control circuit can make the input voltage at the enable end of the voltage converting circuit not meet the requirements of the minimum enable voltage by not inputting the voltage to the enable end of the voltage converting circuit, or inputting the voltage less than the minimum enable voltage to the enable end of the voltage converting circuit, thereby rendering the voltage conversion circuit inoperative, i.e., not supplying power to the main chip. Through the mode, when the OLED television is started quickly, the situation that the main chip is powered off suddenly in the working process due to the fact that the voltage output by the power supply module through the electrolytic capacitor is gradually lower than the minimum input voltage of the voltage conversion circuit in the working process of the voltage conversion circuit, and the main chip is not powered on can be avoided, and therefore abnormal display phenomena such as screen splash, screen flash, screen image blocking and the like of the OLED television can be avoided, and user experience is improved.
Fig. 8 is a schematic flow chart of a power supply method of an OLED display device according to the present invention. The main implementation of the method may be the aforementioned OLED display device, as shown in fig. 8, and the method includes:
and S101, receiving the output voltage of the power supply module.
S102, when the output voltage is larger than or equal to the minimum input voltage of the voltage conversion circuit and smaller than a preset voltage threshold, controlling the voltage conversion chip not to supply power to a main chip of the OLED display device; the preset voltage threshold is less than or equal to the rated output voltage of the power supply module.
Optionally, when the output voltage is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than the preset voltage threshold, controlling the voltage conversion circuit not to supply power to the main chip of the OLED display device includes:
and when the output voltage is greater than or equal to the minimum input voltage of the voltage conversion circuit and less than a preset voltage threshold, not inputting the voltage to the enabling end of the voltage conversion chip so as to enable the voltage conversion circuit not to work. In this case, the control circuit may be, for example, a zener diode as shown in fig. 6.
Or when the output voltage is greater than or equal to the minimum input voltage of the voltage conversion circuit and less than a preset voltage threshold, inputting a first voltage to the enable end of the voltage conversion chip, wherein the first voltage is less than the minimum enable voltage of the voltage conversion chip. In this case, the control circuit may be, for example, a first resistor and a second resistor as shown in fig. 7.
In the power supply method provided by the embodiment of the invention, because the operating conditions of the voltage conversion circuit are that the input voltage at the input end of the voltage conversion circuit is greater than or equal to the minimum input voltage and the input voltage at the enable end of the voltage conversion circuit is greater than or equal to the minimum enable voltage, wherein the minimum enable voltage is less than the minimum input voltage, when the OLED television is rapidly turned on, even if the voltage output by the power supply module discharging through the electrolytic capacitor is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than the preset voltage threshold, that is, the voltage output by the power supply module discharging through the electrolytic capacitor meets the requirements of the voltage conversion circuit on the minimum input voltage and the minimum enable voltage, the voltage can still be input to the enable end of the voltage conversion circuit without inputting the voltage to the enable end of the voltage conversion circuit, or the voltage less than the minimum enable voltage is input to the enable end of the voltage conversion circuit, so that the input voltage of the enable terminal of the voltage conversion circuit does not meet the requirement of the minimum enable voltage, and the voltage conversion circuit does not work, namely, the power is not supplied to the main chip.
Through the mode, when the OLED television is started quickly, the situation that the main chip is powered off suddenly in the working process due to the fact that the voltage output by the power supply module through the electrolytic capacitor is gradually lower than the minimum input voltage of the voltage conversion circuit in the working process of the voltage conversion circuit, and the main chip is not powered on can be avoided, and therefore abnormal display phenomena such as screen splash, screen flash, screen image blocking and the like of the OLED television can be avoided, and user experience is improved.
In another aspect, the present invention further provides a television, which may include the OLED display device in any of the above embodiments, and the implementation principle and the technical effect are similar, and are not described herein again.
In the description herein, reference to the description of the terms "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An OLED display device, comprising: the power supply circuit comprises a main chip, a power supply module, a control circuit and a voltage conversion circuit; wherein,
the output end of the power supply module is respectively connected with the input end of the control circuit and the input end of the voltage conversion circuit, the control end of the control circuit is connected with the enabling end of the voltage conversion circuit, and the output end of the voltage conversion circuit is connected with the power supply end of the main chip;
the control circuit is used for controlling the voltage conversion circuit not to supply power to the main chip when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than a preset voltage threshold; the preset voltage threshold is less than or equal to the rated output voltage of the power supply module.
2. The OLED display device of claim 1, wherein the control circuit comprises: a voltage regulator diode;
the negative electrode of the voltage stabilizing diode is connected with the output end of the power supply module, the positive electrode of the voltage stabilizing diode is connected with the enabling end of the voltage conversion circuit, and the reverse breakdown voltage of the voltage stabilizing diode is equal to the preset voltage threshold value;
when the output voltage of the power supply module is greater than or equal to the minimum input voltage of the voltage conversion circuit and is less than a preset voltage threshold, controlling the voltage conversion circuit not to supply power to the main chip, specifically:
and when the voltage stabilizing diode is cut off, no input voltage exists at the enabling end of the voltage conversion circuit.
3. The OLED display device claimed in claim 1, further comprising: a switching circuit;
the output end of the power supply module is respectively connected with the input end of the control circuit and the input end of the voltage conversion circuit through the switch circuit, and the control end of the main chip is connected with the switch circuit;
the switching circuit is used for switching on or off a current path between the power supply module and the voltage conversion circuit and a current path between the power supply module and the control circuit according to a control signal sent by the main chip.
4. The OLED display device of claim 3, wherein the switching circuit comprises: a third resistor, a switch and an MOS tube;
the first end of the third resistor is connected with the control end of the main chip, the second end of the third resistor is connected with the first end of the switch, the second end of the switch is grounded, the third end of the switch is connected with the grid electrode of the MOS tube, the source electrode of the MOS tube is connected with the power supply module, and the drain electrode of the MOS tube is respectively connected with the input end of the control circuit and the input end of the voltage conversion circuit.
5. The OLED display device of claim 4, wherein the switching circuit further comprises: a fourth resistor;
the first end of the fourth resistor is connected with the power supply module, and the second end of the fourth resistor is connected with the grid electrode of the MOS tube.
6. The OLED display device of claim 5, wherein the switching circuit further comprises: a fifth resistor;
the first end of the fifth resistor is connected with the third end of the switch, and the second end of the fifth resistor is connected with the grid electrode of the MOS tube.
7. The OLED display device of claim 4, wherein the switch is a triode;
the base electrode of the triode is the first end of the switch, the emitter electrode of the triode is the second end of the switch, and the collector electrode of the triode is the third end of the switch.
8. The OLED display device of claim 1, wherein the voltage conversion circuit comprises: a voltage conversion chip;
an input pin of the voltage conversion chip is connected with an output end of the power supply module, an enable pin of the voltage conversion chip is connected with a control end of the control circuit, and an output pin of the voltage conversion chip is connected with a power supply end of the main chip.
9. A method of powering an OLED display device, the method comprising:
receiving the output voltage of the power supply module;
when the output voltage is greater than or equal to the minimum input voltage of the voltage conversion circuit and less than a preset voltage threshold, controlling the voltage conversion chip not to supply power to a main chip of the OLED display device; the preset voltage threshold is less than or equal to the rated output voltage of the power supply module.
10. The method of claim 9, wherein controlling the voltage conversion circuit not to supply power to a main chip of the electronic device when the output voltage is greater than or equal to a minimum input voltage of the voltage conversion circuit and less than a preset voltage threshold comprises:
not inputting a voltage to an enable terminal of the voltage conversion chip;
or,
and inputting a first voltage to an enabling end of the voltage conversion chip, wherein the first voltage is less than the minimum enabling voltage of the voltage conversion chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811194505.0A CN109449914A (en) | 2018-10-15 | 2018-10-15 | OLED display and its method of supplying power to |
| PCT/CN2019/084564 WO2020077976A1 (en) | 2018-10-15 | 2019-04-26 | Oled display device, oled television, and power supplying method therefor |
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| CN201811194505.0A CN109449914A (en) | 2018-10-15 | 2018-10-15 | OLED display and its method of supplying power to |
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| WO2020077976A1 (en) * | 2018-10-15 | 2020-04-23 | 青岛海信电器股份有限公司 | Oled display device, oled television, and power supplying method therefor |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant after: Hisense Visual Technology Co., Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Applicant before: QINGDAO HISENSE ELECTRONICS Co.,Ltd. |
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