CN-122001212-A - Voltage conversion circuit, driving method, circuit board, display device, computer-readable storage medium, and computer program product

CN122001212ACN 122001212 ACN122001212 ACN 122001212ACN-122001212-A

Abstract

The application provides a voltage conversion circuit, a driving method, a circuit board, a computer readable storage medium and a computer program product; the voltage conversion circuit comprises a detection control sub-circuit, a conversion sub-circuit and a voltage boosting and reducing sub-circuit, wherein the detection control sub-circuit is used for detecting the frequency of a frame starting signal and the voltage value of a first voltage signal, and under the condition that the frequency and the voltage value of the first voltage signal do not meet a first preset relation, the duty ratio of a pulse signal is adjusted to control the switch of the voltage boosting and reducing sub-circuit, so that the purpose of adjusting and modifying the voltage value of the first voltage signal is achieved. The voltage conversion circuit can provide signals with different voltage values aiming at different refresh rates, so that different refresh rate modes in the display product with the variable refresh rate are considered, and the performance of the display product is improved.

Inventors

FANG LUOCHENG
GUO XU

Assignees

合肥京东方视讯科技有限公司
京东方科技集团股份有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (15)

1. A voltage conversion circuit, the voltage conversion circuit comprising: The detection control sub-circuit is respectively and electrically connected with the frame start signal input end, the first power supply signal input end, the first voltage signal input end and the pulse signal output end, and is configured to detect the frequency of the frame start signal, detect the voltage value of the first voltage signal, and generate and output a pulse signal according to the frequency of the frame start signal and the voltage value of the first voltage signal, wherein under the condition that the voltage value of the first voltage signal and the frequency of the frame start signal do not meet a first preset relation, the detection control sub-circuit is further configured to adjust the duty ratio of the pulse signal until the voltage value of the first voltage signal and the frequency of the frame start signal meet the first preset relation; The conversion sub-circuit is respectively and electrically connected with the second power supply signal input end, the grounding end, the pulse signal output end and the grid control signal output end, and is configured to generate and output a grid control signal according to the second power supply signal and the pulse signal; And the step-up and step-down subcircuit is respectively and electrically connected with the second power supply signal input end, the grid control signal input end and the first voltage signal input end, and is configured to generate the first voltage signal and transmit the first voltage signal to the detection control subcircuit under the control of the grid control signal input by the grid control signal input end.
2. The voltage conversion circuit of claim 1, wherein the detection control sub-circuit comprises: a first detection unit electrically connected to the frame start signal input terminal and configured to detect a frequency of the frame start signal; The second detection unit is electrically connected with the first node and is configured to detect the voltage of the first node, wherein the voltage of the first node is a reference voltage; The control unit is respectively and electrically connected with the first detection unit and the second detection unit and is configured to judge whether the voltage value of the first voltage signal and the frequency of the frame start signal meet the first preset relation according to the voltage value of the reference voltage; in the case that the voltage value of the first voltage signal and the frequency of the frame start signal do not satisfy a first preset relationship, the control unit is further configured to adjust the duty cycle of the pulse signal until the voltage value of the first voltage signal and the frequency of the frame start signal satisfy the first preset relationship; And the pulse signal generating unit is respectively and electrically connected with the control unit and the pulse signal output end and is configured to generate the pulse signal according to the duty ratio of the pulse signal determined by the control unit.
3. The voltage conversion circuit of claim 2, wherein the detection control sub-circuit further comprises: a first resistor electrically connected to the first power supply signal input terminal and the first node, respectively; And a second resistor electrically connected to the first voltage signal input terminal and the first node, respectively.
4. The voltage conversion circuit of claim 3, wherein the control unit is further configured to increase the duty cycle of the pulse signal when the reference voltage is less than a threshold voltage, and to decrease the duty cycle of the pulse signal when the reference voltage is greater than the threshold voltage.
5. A voltage conversion circuit according to claim 3, wherein the conversion sub-circuit comprises a first capacitor and a conversion unit; the first electrode of the first capacitor is electrically connected with the grounding end, and the second electrode of the first capacitor is electrically connected with the first port and the second port of the conversion unit respectively; The conversion sub-circuit is further configured to generate the gate control signal according to the pulse signal and the second power supply signal; The first port and the second port of the conversion unit are respectively and electrically connected with the second power supply signal input end, the third port of the conversion unit is electrically connected with the pulse signal output end of the detection control sub-circuit, the fourth port of the conversion unit is grounded, and the fifth port of the conversion unit outputs the grid control signal.
6. The voltage conversion circuit of claim 5, wherein the step-up and step-down subcircuit comprises: The switching tube is respectively and electrically connected with the second power supply signal input end, the grid control signal output end of the conversion sub-circuit and the second node and is configured to conduct a path between the second power supply signal input end and the second node under the control of the grid control signal; the cathode of the diode is electrically connected with the second node, and the anode of the diode is electrically connected with the third node; the inductor is respectively and electrically connected with the cathode of the diode and the grounding end; A second capacitor, wherein a first electrode of the second capacitor is electrically connected with the anode of the diode, and a second electrode of the second capacitor is electrically connected with the grounding terminal; And the third resistor is respectively and electrically connected with the grounding end and the third node, and the third node is electrically connected with the first voltage signal input end.
7. The voltage conversion circuit of claim 6, wherein the step-up and step-down subcircuit further comprises: And the first electrode of the third capacitor is electrically connected with the second power supply signal input end, and the second electrode of the third capacitor is electrically connected with the grounding end.
8. The voltage conversion circuit according to any one of claims 1 to 7, wherein the first preset relationship includes a correspondence between a first frequency and a first voltage value, the first frequency being 60Hz, the first voltage value being-10V, the second frequency being 50Hz, and the second voltage value being-11V.
9. A circuit board comprising the voltage conversion circuit according to any one of claims 1 to 8.
10. A display device comprising the circuit board of claim 9.
11. A driving method of a voltage conversion circuit according to any one of claims 1 to 8, characterized by comprising: Detecting the frequency of a frame start signal; Determining a voltage value of the first voltage signal; Acquiring a first preset relation between the frequency of the frame start signal and the voltage value of the first voltage signal; And under the condition that the voltage value of the first voltage signal and the frequency of the frame start signal do not meet the first preset relation, adjusting the duty ratio of the pulse signal until the voltage value of the first voltage signal and the frequency of the frame start signal meet the first preset relation.
12. The driving method according to claim 11, wherein the step of determining the voltage value of the first voltage signal includes: Detecting a reference voltage; Determining a second preset relationship between the reference voltage and the voltage value of the first voltage signal; and obtaining the voltage value of the first voltage signal according to the voltage value of the reference voltage and the second preset relation.
13. The driving method according to claim 12, wherein the step of adjusting the duty ratio of the pulse signal until the voltage value of the first voltage signal and the frequency of the frame start signal satisfy the first preset relationship, in the case where the voltage value of the first voltage signal and the frequency of the frame start signal do not satisfy the first preset relationship, comprises: judging whether the voltage value of the first voltage signal and the frequency of the frame start signal meet the first preset relation or not according to the voltage value of the reference voltage; When the reference voltage is smaller than the critical voltage, increasing the duty ratio of the pulse signal; and when the reference voltage is larger than the critical voltage, reducing the duty ratio of the pulse signal until the voltage value of the first voltage signal and the frequency of the frame start signal meet a first preset relation.
14. A computer readable storage medium having instructions stored therein which, when executed on the computer, cause the computer to perform the driving method of any one of claims 11 to 13.
15. A computer program product comprising instructions which, when run on a computer, cause the computer to perform the driving method of any of claims 11 to 13.

Description

Voltage conversion circuit, driving method, circuit board, display device, computer-readable storage medium, and computer program product Technical Field The present application relates to the field of display technologies, and in particular, to a voltage conversion circuit, a driving method thereof, a circuit board, a display device, a computer readable storage medium, and a computer program product. Background With the development of display technology, the variety of display products is gradually increased, and the performance requirements are also gradually improved. To ensure faster transistor turn-off to avoid leakage current, it is often necessary to design different circuit boards to provide low level signals of different voltage values for display products of different refresh rates. However, for display products with variable refresh rates, it is difficult to compromise between different refresh rate modes by signals provided by the same circuit board. Disclosure of Invention Embodiments of the present application provide a voltage conversion circuit, a driving method, a circuit board, a display device, a computer readable storage medium, and a computer program product, where the voltage conversion circuit may provide signals with different voltage values for different refresh rates, so as to give consideration to different refresh rate modes in a display product with a variable refresh rate, and improve performance of the display product. The embodiment of the application adopts the following technical scheme: In a first aspect, embodiments of the present application provide a voltage conversion circuit including: The detection control sub-circuit is respectively and electrically connected with the frame start signal input end, the first power supply signal input end, the first voltage signal input end and the pulse signal output end, and is configured to detect the frequency of the frame start signal, detect the voltage value of the first voltage signal, and generate and output a pulse signal according to the frequency of the frame start signal and the voltage value of the first voltage signal, wherein under the condition that the voltage value of the first voltage signal and the frequency of the frame start signal do not meet a first preset relation, the detection control sub-circuit is further configured to adjust the duty ratio of the pulse signal until the voltage value of the first voltage signal and the frequency of the frame start signal meet the first preset relation; The conversion sub-circuit is respectively and electrically connected with the second power supply signal input end, the grounding end, the pulse signal output end and the grid control signal output end, and is configured to generate and output a grid control signal according to the second power supply signal and the pulse signal; And the step-up and step-down subcircuit is respectively and electrically connected with the second power supply signal input end, the grid control signal input end and the first voltage signal input end, and is configured to generate the first voltage signal and transmit the first voltage signal to the detection control subcircuit under the control of the grid control signal input by the grid control signal input end. In some voltage conversion circuits provided by embodiments of the present application, the detection control sub-circuit includes: a first detection unit electrically connected to the frame start signal input terminal and configured to detect a frequency of the frame start signal; The second detection unit is electrically connected with the first node and is configured to detect the voltage of the first node, wherein the voltage of the first node is a reference voltage; The control unit is respectively and electrically connected with the first detection unit and the second detection unit and is configured to judge whether the voltage value of the first voltage signal and the frequency of the frame start signal meet the first preset relation according to the voltage value of the reference voltage; in the case that the voltage value of the first voltage signal and the frequency of the frame start signal do not satisfy a first preset relationship, the control unit is further configured to adjust the duty cycle of the pulse signal until the voltage value of the first voltage signal and the frequency of the frame start signal satisfy the first preset relationship; And the pulse signal generating unit is respectively and electrically connected with the control unit and the pulse signal output end and is configured to generate the pulse signal according to the duty ratio of the pulse signal determined by the control unit. In some voltage conversion circuits provided by embodiments of the present application, the detection control sub-circuit further includes: the first resistor is electrically connected with the first power supply signal input end and the first node respectively; And a se