CN216287526U - Power supply driving circuit of backlight display system - Google Patents
Power supply driving circuit of backlight display system Download PDFInfo
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- CN216287526U CN216287526U CN202121948938.8U CN202121948938U CN216287526U CN 216287526 U CN216287526 U CN 216287526U CN 202121948938 U CN202121948938 U CN 202121948938U CN 216287526 U CN216287526 U CN 216287526U
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Abstract
The utility model discloses a power supply driving circuit of a backlight source display system, which comprises a power supply processing module and a state control circuit, wherein the input end of the power supply processing module is electrically connected with a power supply, the output end of the power supply processing module is electrically connected with the display system, the input end of the power supply processing module is also provided with a rechargeable energy storage device which is connected with the power supply in parallel, and the energy storage device is used for providing delay screen-off time for the display system; the input end of the state control circuit is electrically connected with the power supply, and the output end of the state control circuit is electrically connected with the display system; by adopting the power supply driving circuit with the structure, when the power supply is disconnected, the energy storage device continues to provide a working power supply for the display system so as to prolong the screen rest time of the display system, and the backlight discharges in the screen rest time delayed by the energy storage device, so that the accumulated charges are released, the phenomenon of screen flicker and jitter when the display system is restarted is avoided, and the use experience is effectively improved.
Description
Technical Field
The utility model relates to the technical field of power supply driving circuits, in particular to a power supply driving circuit of a backlight source display system.
Background
With the continuous development of vehicle intelligent technology, most of the existing vehicles are provided with vehicle-mounted display systems, so that good user experience is brought to users. The display screen serving as a core component of the vehicle-mounted display system is a backlight display device, and a light source device serving as a backlight has junction capacitance, so that charges can be accumulated on the light source device in the standby display process of the display screen.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a power supply driving circuit of a backlight display system, which can delay screen refreshing to release accumulated charges in a screen when a power supply is turned off.
In order to achieve the purpose, the utility model discloses a power supply driving circuit of a backlight source display system, which comprises a power supply processing module and a state control circuit, wherein the input end of the power supply processing module is electrically connected with a power supply, the output end of the power supply processing module is electrically connected with the display system, the power supply processing module is used for processing a power supply signal provided by the power supply into a driving power supply signal matched with the display system, the input end of the power supply processing module is also provided with a rechargeable energy storage device connected with the power supply in parallel, and the energy storage device is used for providing delay screen-off time for the display system; the input end of the state control circuit is electrically connected with the power supply, the output end of the state control circuit is electrically connected with the display system, and the state control circuit is used for controlling the backlight source of the display system to be in a working state or a discharging state according to the working state of the power supply.
Preferably, when the power supply is in a normal working state, the state control circuit outputs a high level to make the backlight source in a working state; when the voltage of the power supply drops below a preset value, the state control circuit outputs a low level to enable the backlight source to be in a discharge state.
Preferably, the energy storage device comprises a buffer capacitor.
Preferably, the time of delaying screen resting provided by the energy storage device for the display system is 20-30 ms.
Preferably, a diode for preventing reverse flow is arranged between the energy storage device and the power supply.
Preferably, a protective tube is further arranged between the diode and the power supply.
Preferably, the power supply processing module comprises a switching power supply.
Preferably, the input end of the switching power supply is further provided with a plurality of filter capacitors.
Compared with the prior art, the power supply driving circuit of the backlight source display system comprises a power supply processing module, a state control circuit and an energy storage device, when the display system is in a standby state (including screen display and dormancy), a power supply supplies power to the display system through the power supply processing module, when the power supply is disconnected, the energy storage device continues to provide working power for the display system so as to prolong the screen rest time of the display system, meanwhile, under the action of the state control circuit, the backlight source in the display system is in a discharging state, the backlight source discharges within the time delay screen rest time provided by the energy storage device, and therefore accumulated charges of the backlight source are released, the phenomenon that a screen flickers when the display system is restarted is avoided, and the use experience is effectively improved.
Drawings
Fig. 1 is a schematic diagram of a power driving circuit according to an embodiment of the utility model.
Detailed Description
In order to explain technical contents, structural features, and objects and effects of the present invention in detail, the following detailed description is given with reference to the accompanying drawings in conjunction with the embodiments.
As shown in fig. 1, the present embodiment discloses a power driving circuit for a backlight display system, which is particularly suitable for a vehicle-mounted display system, but not limited thereto, and achieves the purpose of discharging the backlight by delaying the screen-off time of the display system and controlling the operating state of the backlight in the display system. As shown in fig. 1, the driving circuit includes a power processing module 20 and a state control circuit 21, an input end of the power processing module 20 is electrically connected to a power supply VSYS, when the driving circuit is used for a vehicle-mounted device, the power supply VSYS is a system power supply of a vehicle-mounted dc power supply after voltage reduction, an output end of the power processing module 20 is electrically connected to the display system 100, the power processing module 20 is configured to process a power signal provided by the power supply VSYS into a driving power signal adapted to the display system 100, an input end of the power processing module 20 is further provided with a rechargeable energy storage device C0 connected in parallel with the power supply VSYS, and the energy storage device C0 is configured to provide a delay screen rest time for the display system 100. The input end of the state control circuit 21 is electrically connected with the power supply VSYS, the output end of the state control circuit 21 is electrically connected with the display system 100, and the state control circuit 21 is used for controlling the backlight source in the display system 100 to be in a working state or a discharging state according to the working state of the power supply VSYS.
Preferably, when the power supply VSYS is in a normal operation state, the state control circuit 21 outputs a high level, so that the backlight is in an operation state. When the voltage of the power supply VSYS falls below a preset value, the state control circuit 21 outputs a low level to make the backlight in a discharge state. Therefore, when the power supply VSYS fails, the output terminal of the state control circuit 21 is maintained at a low level, and the pin level of the backlight is pulled down, so that the backlight is in a discharge state.
In the above-described embodiment, the state control circuit 21 is preferably a reset integrated circuit. When the power supply VSYS is in a normal state, for example, 3.3V, the reset integrated circuit outputs a high level, and then the reset integrated circuit pulls up the pin level of the backlight source to make it in a high level state, thereby controlling the backlight source to be in a normal working state. When the photoelectric power supply is disconnected or falls below a preset value, the output of the reset integrated circuit is in a low level state, then the reset integrated circuit pulls down the pin level of the backlight source, the backlight source is controlled to be in a discharging state, at the moment, the display system 100 is still in a screen display state under the action of the energy storage device C0, therefore, the backlight source can execute discharging work, charges accumulated on the backlight source can be released through the grounding end, after the electric quantity stored by the energy storage device C0 is used up, the discharging of the backlight source is finished, the backlight source is enabled to reach a pure state, and when the power supply VSYS is recovered again to start the display system 100, the phenomenon of flicker and jitter is effectively avoided.
Specifically, the energy storage device C0 includes a buffer capacitor C0, and the specification of the buffer capacitor C0 in this embodiment is 2200 uF/16V. The energy storage device C0 provides 20-30 ms of delay screen-resting time for the display system 100.
More specifically, in order to prevent the power signal provided by the energy storage device C0 from flowing backwards to the power supply VSYS side, a diode D1 for preventing backflow is arranged between the energy storage device C0 and the power supply VSYS. In addition, a protective tube F1 is arranged between the diode D1 and the power supply VSYS to avoid the impact current from influencing the driving circuit.
Preferably, the power processing module 20 in the above embodiment is preferably a switching power supply 20. In order to avoid the influence of the unstable signal input by the power supply VSYS on the switching power supply 20, the input terminal of the switching power supply 20 is further provided with a plurality of filter capacitors C1.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (8)
1. The power supply driving circuit of the backlight source display system is characterized by comprising a power supply processing module and a state control circuit, wherein the input end of the power supply processing module is electrically connected with a power supply, the output end of the power supply processing module is electrically connected with the display system, the power supply processing module is used for processing a power supply signal provided by the power supply into a driving power supply signal matched with the display system, the input end of the power supply processing module is also provided with a rechargeable energy storage device connected with the power supply in parallel, and the energy storage device is used for providing delay screen-off time for the display system; the input end of the state control circuit is electrically connected with the power supply, the output end of the state control circuit is electrically connected with the display system, and the state control circuit is used for controlling the backlight source in the display system to be in a working state or a discharging state according to the working state of the power supply.
2. The backlight source display system power supply driving circuit according to claim 1, wherein when the power supply is in a normal operation state, the state control circuit outputs a high level to make the backlight source in an operation state; when the voltage of the power supply drops below a preset value, the state control circuit outputs a low level to enable the backlight source to be in a discharge state.
3. The backlight display system power driver circuit of claim 1, wherein the energy storage device comprises a buffer capacitor.
4. The power supply driving circuit of claim 1, wherein the energy storage device provides a delay screen-off time for the display system of 20-30 ms.
5. The power driving circuit of claim 1, wherein a diode for preventing reverse current is disposed between the energy storage device and the power supply.
6. The backlight display system power supply driving circuit according to claim 5, wherein a fuse is further disposed between the diode and the power supply.
7. The backlight display system power driver circuit of claim 1, wherein the power processing module comprises a switching power supply.
8. The power supply driving circuit of claim 7, wherein the input terminal of the switching power supply further comprises a plurality of filter capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121948938.8U CN216287526U (en) | 2021-08-18 | 2021-08-18 | Power supply driving circuit of backlight display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121948938.8U CN216287526U (en) | 2021-08-18 | 2021-08-18 | Power supply driving circuit of backlight display system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216287526U true CN216287526U (en) | 2022-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121948938.8U Active CN216287526U (en) | 2021-08-18 | 2021-08-18 | Power supply driving circuit of backlight display system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216287526U (en) |
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2021
- 2021-08-18 CN CN202121948938.8U patent/CN216287526U/en active Active
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