CN115691413A - Time schedule controller, power supply circuit and method and display device - Google Patents
Time schedule controller, power supply circuit and method and display device Download PDFInfo
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- 230000033228 biological regulation Effects 0.000 claims description 4
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Abstract
The embodiment of the invention discloses a time schedule controller, a power supply circuit, a power supply method and a display device. In one embodiment, the power supply circuit comprises a power supply and a time schedule controller, wherein the time schedule controller comprises a processor, a switch and a voltage conversion chip; the first end of the switch is connected with the output end of the power supply, and the second end of the switch is connected with the input end of the voltage conversion chip; the output end of the voltage conversion chip is connected with the working voltage input end of the display device to be powered; the processor is used for outputting a first enabling signal to the switch at a first moment and outputting a second enabling signal to the voltage conversion chip at a second moment with a set time delay compared with the first moment, so that the power supply voltage output by the power supply is output to the working voltage input end of the display device to be supplied with power through the voltage conversion chip in the non-working state between the first moment and the second moment, and is increased to the working voltage of the display device to be supplied with power by the voltage conversion chip in the working state from the second moment and is output to the working voltage input end of the display device to be supplied with power.
Description
Technical Field
The invention relates to the technical field of display. And more particularly, to a timing controller, a power supply circuit and method, and a display device.
Background
The inventor finds that, at present, for example, in an Organic Light Emitting Diode (OLED) display device, when a power supply passes through a Timing Controller (TCON) to power on a data driving circuit, for example, a power supply display device, a power down phenomenon occurs after power on occurs, especially for a large-sized OLED display device.
Disclosure of Invention
The invention aims to provide a time schedule controller, a power supply circuit, a power supply method and a display device, which are used for solving at least one of the problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a time schedule controller in a first aspect, which comprises a processor, a switch and a voltage conversion chip; the first end of the switch is connected with the output end of the power supply, and the second end of the switch is connected with the voltage input end of the voltage conversion chip; the voltage output end of the voltage conversion chip is connected with the working voltage input end of the display device to be powered;
the processor is used for outputting a first enabling signal to the switch at a first moment and outputting a second enabling signal to the voltage conversion chip at a second moment which is longer than the first moment by a set time delay, so that the power supply voltage output by the power supply is output to the working voltage input end of the display device to be supplied with power through the voltage conversion chip in the non-working state between the first moment and the second moment, and is increased to the working voltage of the display device to be supplied with power by the voltage conversion chip in the working state from the second moment and is output to the working voltage input end of the display device to be supplied with power.
Optionally, the display device to be powered is a data driving circuit.
Optionally, the value range of the set duration is 1s-2s.
Optionally, the switch is a switching transistor.
Optionally, the processor is a field programmable gate array.
A second aspect of the present invention provides a power supply circuit, which includes a power supply and the above-mentioned timing controller.
Optionally, the power supply circuit further includes a voltage stabilizing capacitor, a first end of the voltage stabilizing capacitor is connected to the output end of the power supply, and a second end of the voltage stabilizing capacitor is grounded.
Optionally, the voltage regulation capacitor comprises a plurality of voltage regulation capacitors connected in parallel.
A third aspect of the present invention provides a display device including the above power supply circuit.
A fourth aspect of the present invention provides a power supply method using the power supply circuit, including:
and outputting a first enabling signal to a switch at a first moment and outputting a second enabling signal to a voltage conversion chip at a second moment which is delayed for a set time length compared with the first moment, so that a power supply voltage output by the power supply is output to a working voltage input end of a display device to be supplied with power through the voltage conversion chip in a non-working state between the first moment and the second moment, and is increased to the working voltage of the display device to be supplied with power by the voltage conversion chip in a working state from the second moment and is output to the working voltage input end of the display device to be supplied with power.
The invention has the following beneficial effects:
according to the technical scheme, the step-type power-on of the display device waiting for power supply of the data driving circuit can be realized through the enabling control of the time schedule controller under the condition that a voltage conversion chip is not additionally arranged, the phenomenon that the power supply is powered off after being powered on can be avoided, and the normal work of the display device is ensured.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a known power supply circuit.
Fig. 2 is a graph showing the change of the output voltage of the conventional power supply circuit when the data driving circuit is powered on.
Fig. 3 shows a graph of supply voltage droop for a prior art power supply circuit when powering up a data driver circuit.
Fig. 4 shows a schematic diagram of a power supply circuit provided in the first embodiment.
Fig. 5 shows a schematic diagram of the power supply circuit according to the second embodiment.
Fig. 6 is a graph showing the output voltage variation of the power supply circuit according to the second embodiment when the data driving circuit is powered on.
Fig. 7 shows a schematic diagram of another power supply circuit provided in the second embodiment.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to the following examples and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
The inventor finds that, at present, for example, in an Organic Light Emitting Diode (OLED) display device, when a power supply passes through a Timing Controller (TCON) to power up a data driving circuit, for example, a display device, the power is lost after power up, especially for a large-sized OLED display device.
The inventors studied the cause of the above phenomenon:
taking an 8K OLED display panel with a display device of 95 ″ and a data driving circuit with a to-be-powered display device, such as a Chip On Film (COF IC), as shown in fig. 1, the existing power supply circuit includes a power supply 110 and a timing controller 120, the timing controller 120 includes a processor 121, a switch 122 and a voltage conversion Chip 123, a first end of the switch 122 is connected to an output end of the power supply 110, a second end of the switch 122 is connected to a voltage input end of the voltage conversion Chip 123, a voltage output end of the voltage conversion Chip 123 is connected to a working voltage input end of the data driving circuit 190, the processor 121 is configured to enable the switch 122 through a first enable signal EN1 according to a power-On timing sequence, and when the switch 122 is enabled, the voltage conversion Chip 123 raises a power supply voltage Vin, such as 12v, output by the power supply 110 to a working voltage Vout of the data driving circuit 190, and outputs the working voltage Vout to the working voltage input end of the data driving circuit 190, so as to power On the data driving circuit 190.
The inventor found that the data driving circuit 190 includes a capacitive load formed by a capacitor and the like. When the power supply powers on the data driving circuit 190, the capacitive load needs to be charged, the power-on current is large, and the instantaneous current or instantaneous power during power-on is large and is likely to exceed the upper power limit of the power supply 110, which may cause the power supply voltage of the power supply 110 to drop, and cause the power failure after power-on. The data driving circuit 190 of the large-sized OLED display device needs a larger working voltage and a larger capacitive load, so that the power failure phenomenon is more likely to occur after power-on.
In a specific example, the inventor tests an 8KOLED display screen of 95 ″, and when the data driving circuit 190 is powered on, as shown in fig. 2, from time t1 of enabling the switch 122, the required output voltage (analog voltage, AVDD) is increased from 0v to 16.5v, and the measured instantaneous current is 26A, at this time, the current provided by the 12v supply voltage Vin output by the power supply 110 is insufficient, and the supply voltage Vin may drop, as shown in fig. 3.
In order to solve the power failure phenomenon of the power supply 110 after power-on, the power of the power supply 110 can be increased, but the method has higher cost and involves various problems such as heat dissipation and the like.
In view of this, the first embodiment provides a power supply circuit capable of avoiding the power failure phenomenon after power up without increasing the power of a power supply, taking as an example that the power supply circuit is applied to an 8K OLED display screen of a 95 ″ display device, and a data driving circuit of which a display device to be powered is, for example, a flip-chip thin film chip, as shown in fig. 4, the power supply circuit provided in the first embodiment includes a power supply 410 and a timing controller 420, the timing controller 420 includes a processor 421, a switch 422, a first voltage conversion chip 423 and a voltage conversion chip 424, a first end of the switch 422 is connected to an output end of the power supply 410, a second end of the switch 422 is connected to a voltage input end of the first voltage conversion chip 423, a voltage output end of the first voltage conversion chip 423 is connected to a voltage input end of the second voltage conversion chip 424, and a voltage output end of the second voltage conversion chip 424 is connected to an operating voltage input end of the data driving circuit 490. The processor 421 firstly enables the switch 422 through the first enable signal EN1 according to the power-on timing sequence, when the switch 422 is enabled, the first voltage conversion chip 423 boosts the supply voltage Vin, for example, 12v output by the power source 410 to the intermediate voltage Vout1, for example, 14v, at this time, the second voltage conversion chip 424 is not enabled and is in a non-working state, and the intermediate voltage Vout1 is not boosted but is directly output to the data driving circuit 490. Then, after a delay time of a set duration elapses to stabilize the charging of the capacitive load in the data driving circuit 490, the processor 421 enables the second voltage converting chip 424 through the second enable signal EN2, and the second voltage converting chip 424 boosts the intermediate voltage Vout1 of, for example, 14v to the operating voltage Vout of the data driving circuit 490 of, for example, 16.5v and outputs the boosted voltage to the operating voltage input terminal of the data driving circuit 490, so as to implement power-on of the data driving circuit 490.
Therefore, in the power supply circuit provided in the first embodiment, under the condition of additionally adding the voltage conversion chip, the instantaneous current during power-on is reduced through stepwise power-on, or the excessive instantaneous current during power-on is avoided, so that the power-on instantaneous power can be reduced to be below the upper power limit of the power supply 410, and the power failure phenomenon of the power supply 410 after power-on is avoided.
Although the first embodiment can avoid the power-down phenomenon after the power-on of the power supply under the condition of not increasing the power of the power supply, the first embodiment is not ideal in terms of cost and the like because a voltage conversion chip is additionally required.
In view of this, the second embodiment provides a power supply circuit capable of avoiding the power failure phenomenon after power up without increasing the power of the power supply and without additionally adding a voltage conversion chip, taking as an example that the power supply circuit is applied to an 8K OLED display screen with a display device of 95 ″ and a data driving circuit with a to-be-supplied display device being, for example, a flip-chip thin film chip, as shown in fig. 5, the power supply circuit provided by the second embodiment includes a power supply 510 and a timing controller 520, the timing controller 520 includes a processor 521, a switch 522 and a voltage conversion chip 523, a first end of the switch 522 is connected to an output end of the power supply 510, a second end of the switch 522 is connected to a voltage input end of the voltage conversion chip 523, and a voltage output end of the voltage conversion chip 523 is connected to a working voltage input end of the data driving circuit 590.
As shown in fig. 6, the processor 521 is configured to output a first enable signal EN1 to the switch 522 at a first time t1 and output a second enable signal EN2 to the voltage conversion chip 523 at a second time t2 delayed by a set time from the first time t1, so that a supply voltage Vin, for example, 12v output by the power supply 510 is directly output to an operating voltage input terminal of the data driving circuit 590 through the voltage conversion chip 523 in a non-operating state between the first time t1 and the second time t2, so that a capacitive load in the data driving circuit 590 is charged and stabilized within the set time, and the supply voltage Vin, for example, 12v output by the power supply 510 is boosted to an operating voltage Vout of the data driving circuit 590, for example, 16.5v by the voltage conversion chip 523 in an operating state from the second time t2 and output to an operating voltage input terminal of the data driving circuit 590, thereby implementing power-up start of the data driving circuit 590.
Therefore, the power supply circuit provided in the second embodiment can implement the step-like power-up of the data driving circuit 590 by the enable control of the timing controller 520 without increasing the power of the power supply and without additionally adding a voltage conversion chip, thereby reducing the instantaneous current during power-up, or avoiding the occurrence of an excessive instantaneous current during power-up, so that the power-up instantaneous power can be reduced to below the upper power limit of the power supply 510, thereby avoiding the power failure of the power supply 510 after power-up, and ensuring the normal operation of the display device.
In a possible implementation manner, the value range of the set time duration is 1s-2s, that is, the time delay between the second time t2 and the first time t1 is 1s-2s, so that it can be ensured that the time duration of the time delay matches the time duration required by the capacitive load in the data driving circuit 590 to tend to be stable when the charging is performed according to the supply voltage Vin, such as 12v, output by the power supply 510.
In one possible implementation, the switch 522 is a switching transistor. For example, the switching transistor has the advantages of long service life, safety, reliability, no mechanical wear, high switching speed, small size and the like, and can control the on-off of large current by using an enable signal of very small current. For example, a control electrode of the switching transistor is connected to the output terminal of the first enable signal EN1 of the processor 521, a first electrode of the switching transistor is connected to the output terminal of the power supply 510, and a second electrode of the switching transistor is connected to the voltage input terminal of the voltage converting chip 523.
In one possible implementation, the processor 521 is a Field Programmable Gate Array (FPGA).
In a possible implementation manner, as shown in fig. 7, the power supply circuit provided in the second embodiment further includes a voltage stabilizing capacitor C1, a first end of the voltage stabilizing capacitor C1 is connected to the output terminal of the power supply 510, and a second end of the voltage stabilizing capacitor C1 is grounded.
Therefore, the energy storage capacity of the voltage stabilizing capacitor C1 can be utilized to stabilize the power supply voltage Vin output by the power supply 510, thereby further ensuring that the occurrence of excessive instantaneous current is avoided when the switch 522 is enabled at the first moment t1 and the voltage conversion chip 523 is enabled at the second moment t2, and further improving the stability of the power supply circuit.
In one possible implementation, the voltage stabilizing capacitor C1 includes a plurality of voltage stabilizing capacitors connected in parallel. Because the capacitor with a larger capacitance value has higher cost, the design capacitance value of the voltage stabilizing capacitor C1 can be realized by using a plurality of voltage stabilizing capacitors with smaller capacitance values which are connected in parallel, for example, the capacitance value of the voltage stabilizing capacitor C1 is designed to be 100 μ F-200 μ F, and the voltage stabilizing capacitor C1 can be realized by using three voltage stabilizing capacitors with the capacitance value of 47 μ F which are connected in parallel.
It is understood that the switch in the second embodiment is a switching transistor, the processor is a field programmable gate array, the processor includes a voltage stabilizing capacitor, and the like, and the second embodiment is also applicable.
The third embodiment provides a power supply method based on the power supply circuit provided by the second embodiment, and the power supply method includes the following steps:
and outputting a first enabling signal to a switch at a first moment and outputting a second enabling signal to a voltage conversion chip at a second moment which is delayed for a set time length compared with the first moment, so that a power supply voltage output by the power supply is output to a working voltage input end of a display device to be supplied with power through the voltage conversion chip in a non-working state between the first moment and the second moment, and is increased to the working voltage of the display device to be supplied with power by the voltage conversion chip in a working state from the second moment and is output to the working voltage input end of the display device to be supplied with power.
It should be noted that the power supply method provided in this embodiment is similar to the power supply circuit provided in the second embodiment in principle and working flow, and reference may be made to the above description for relevant parts, which are not described herein again.
An embodiment four provides a display device including the power supply circuit provided in the second embodiment or the third embodiment. For example, the display device provided in this embodiment is an OLED display device, and the OLED display device may be any product or component having a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator, which is not limited in this embodiment.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It is further noted that, in the description of the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and all obvious variations and modifications belonging to the technical scheme of the present invention are within the protection scope of the present invention.
Claims (10)
1. The time schedule controller is characterized by comprising a processor, a switch and a voltage conversion chip; the first end of the switch is connected with the output end of the power supply, and the second end of the switch is connected with the voltage input end of the voltage conversion chip; the voltage output end of the voltage conversion chip is connected with the working voltage input end of the display device to be powered;
the processor is used for outputting a first enabling signal to the switch at a first moment and outputting a second enabling signal to the voltage conversion chip at a second moment which is longer than the first moment by a set time delay, so that the power supply voltage output by the power supply is output to the working voltage input end of the display device to be supplied with power through the voltage conversion chip in the non-working state between the first moment and the second moment, and is increased to the working voltage of the display device to be supplied with power by the voltage conversion chip in the working state from the second moment and is output to the working voltage input end of the display device to be supplied with power.
2. The timing controller of claim 1, wherein the display device to be powered is a data driving circuit.
3. The timing controller according to claim 1 or 2, wherein the set duration is in a range of 1s-2s.
4. The timing controller of claim 1, wherein the switch is a switching transistor.
5. The timing controller of claim 1, wherein the processor is a field programmable gate array.
6. A power supply circuit comprising a power supply and a timing controller according to any one of claims 1 to 5.
7. The power supply circuit of claim 6, further comprising a voltage stabilizing capacitor having a first terminal connected to the output terminal of the power supply and a second terminal connected to ground.
8. The power supply circuit of claim 7, wherein the voltage regulation capacitor comprises a plurality of voltage regulation capacitors connected in parallel.
9. A display device characterized by comprising a power supply circuit according to any one of claims 6 to 8.
10. A power supply method using the power supply circuit according to any one of claims 6 to 8, comprising:
outputting a first enabling signal to a switch at a first moment and outputting a second enabling signal to a voltage conversion chip at a second moment which is longer than the first moment by a set time delay, so that a power supply voltage output by a power supply is output to a working voltage input end of a display device to be supplied with power through the voltage conversion chip in a non-working state between the first moment and the second moment, and is raised to a working voltage of the display device to be supplied with power by the voltage conversion chip in a working state from the second moment and is output to the working voltage input end of the display device to be supplied with power.
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| CN202211190716.3A CN115691413B (en) | 2022-09-28 | 2022-09-28 | Time sequence controller, power supply circuit and method and display device |
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| CN202211190716.3A CN115691413B (en) | 2022-09-28 | 2022-09-28 | Time sequence controller, power supply circuit and method and display device |
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| CN115691413B CN115691413B (en) | 2024-09-03 |
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