CN219609999U - Backlight boosting drive circuit for LED display screen - Google Patents
Backlight boosting drive circuit for LED display screen Download PDFInfo
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- CN219609999U CN219609999U CN202321148698.2U CN202321148698U CN219609999U CN 219609999 U CN219609999 U CN 219609999U CN 202321148698 U CN202321148698 U CN 202321148698U CN 219609999 U CN219609999 U CN 219609999U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
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Abstract
The backlight boosting driving circuit for the LED display screen comprises a G electrode of a MOS tube Q1, a D electrode of the MOS tube Q1, an anode of a diode D1 and a cathode of the diode D1, wherein the G electrode of the MOS tube Q1 is used for being externally connected with and inputting a starting signal GPIO_IN, the D electrode of the MOS tube Q1 is used for being connected with an external power supply to input a voltage IN+, the S electrode of the MOS tube Q1 is connected with the anode of the diode D1 through an inductor L1, and the cathode of the diode D1 is connected with an output end to be used for outputting a voltage OUT+; a resistor R1 and a resistor R2 are connected in series between the cathode of the diode D1 and the ground; CE and VDD pin of chip U1 all are connected with MOS pipe Q1's D utmost point, and chip U1's VO pin is connected to on the equipotential tie point between resistance R1 and the resistance R2, and chip U1's EXT pin passes through resistance R3 to be connected to triode Q2's B utmost point, and triode Q2's C utmost point is connected with diode D1's positive pole, and triode Q2's E utmost point ground. The backlight boosting driving circuit for the LED display screen has the advantages of simple circuit structure, low cost and low power consumption, and the output voltage of the chip U1 is stable, so that the conversion efficiency of the backlight driving chip is improved.
Description
Technical Field
The utility model relates to the technical field of backlight driving, in particular to a backlight boosting driving circuit for an LED display screen.
Background
The liquid crystal display device (LCD, liquid Crystal Display) has many advantages of thin body, power saving, no radiation, etc., and has been widely used. Most of the liquid crystal display devices in the market are backlight type liquid crystal display devices, which include a liquid crystal panel and a backlight module (backlight module). The working principle of the liquid crystal panel is that liquid crystal molecules are placed in two parallel glass substrates, and the direction of the liquid crystal molecules is changed by controlling whether the glass substrates are electrified or not, so that light rays of the backlight module are refracted out to generate a picture. Since the liquid crystal panel itself does not emit light, the backlight module needs to provide a light source to display images normally, and therefore, the backlight module becomes one of the key components of the liquid crystal display device. The backlight module is divided into a side-in type backlight module and a direct type backlight module according to the incidence positions of the light sources. The direct type backlight module is to arrange a light source such as an LED (Light Emitting Diode ) behind the liquid crystal panel to directly form a surface light source for providing to the liquid crystal panel; the side-in backlight module is characterized in that a backlight source LED lamp bar (Lightbar) is arranged at the edge of a back plate at the side rear part of the liquid crystal panel, light rays emitted by the LED lamp bar enter the light guide plate from a light inlet surface at one side of the light guide plate (LGP, light Guide Plate), are reflected and diffused and then are emitted from a light outlet surface of the light guide plate, and are provided for the liquid crystal display panel through an optical film set to form a surface light source.
In the prior art, a backlight unit of a Light Emitting Diode (LED) display screen of a terminal device is generally provided by a dedicated backlight driving chip, so that when in use, particularly when the voltage of the input end of the backlight driving chip is relatively low, the problem of backlight flickering of the screen often occurs, which seriously affects the use experience of a user, and in order to solve the problem, the voltage of the input end of the backlight driving chip is generally increased, however, the method cannot essentially solve the problem of unstable backlight.
Disclosure of Invention
Based on the above, the utility model provides a backlight boosting driving circuit for an LED display screen, so as to obtain stable backlight driving output voltage.
In order to achieve the above objective, the present utility model provides a backlight boost driving circuit for an LED display screen, which includes a MOS transistor Q1, a triode Q2, a diode D1, an inductor L1, and a chip U1, wherein:
the pole G of the MOS tube Q1 is used for being externally connected and inputting a starting signal GPIO_IN, the pole D of the MOS tube Q1 is used for being connected with an external power supply to input voltage IN+, the pole S of the MOS tube Q1 is connected with the anode of the diode D1 through the inductor L1, and the cathode of the diode D1 is connected with an output end to be used for outputting voltage OUT+;
a resistor R1 and a resistor R2 are connected in series between the cathode of the diode D1 and the ground;
the chip U1 is a DC/DC switching controller, and the model is XC6366B103MR; CE and VDD pin of chip U1 all are connected with MOS pipe Q1's D utmost point, and chip U1's VO pin is connected to on the equipotential tie point between resistance R1 and the resistance R2, and chip U1's EXT pin passes through resistance R3 to be connected to triode Q2's B utmost point, and triode Q2's C utmost point is connected with diode D1's positive pole, and triode Q2's E utmost point ground.
As a further preferable embodiment of the present utility model, the input voltage in+ is positive 5V, and the output voltage out+ is positive 12V.
As a further preferable embodiment of the present utility model, the resistor R1 is connected in parallel with a capacitor C1.
As a further preferable embodiment of the present utility model, the resistor R3 is connected in parallel with a capacitor C2.
As a further preferable technical scheme of the utility model, a capacitor EC1 is connected between the access terminal of the input voltage in+ and the ground.
As a further preferable technical scheme of the utility model, a capacitor EC2 is connected between the output end of the output voltage out+ and the ground.
As a further preferable technical scheme of the utility model, a resistor R4 is connected between the access terminal of the start signal gpio_in and the D pole of the MOS transistor Q1, and a resistor R5 is connected between the access terminal of the start signal gpio_in and the G pole of the MOS transistor Q1.
The backlight boosting driving circuit for the LED display screen adopts the chip U1 with the model of XC6366B103MR, and the output voltage of the chip U1 can be stabilized through a circuit formed by the diode D1 and the piezoresistors R1 and R2, so that the conversion efficiency of the backlight driving chip is improved. The circuit has the advantages of simple structure, low cost, low power consumption and high efficiency, and is more suitable for terminal equipment with a small LED display screen, such as a smart watch, a thermometer and other handheld terminals.
Drawings
The utility model will be described in further detail with reference to the drawings and the detailed description.
Fig. 1 is a schematic diagram of a backlight boost driving circuit for an LED display according to an embodiment of the present utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The utility model will be further described with reference to the drawings and detailed description. The terms such as "upper", "lower", "left", "right", "middle" and "a" in the preferred embodiments are merely descriptive, but are not intended to limit the scope of the utility model, as the relative relationship changes or modifications may be otherwise deemed to be within the scope of the utility model without substantial modification to the technical context.
As shown in fig. 1, the utility model provides a backlight boost driving circuit for an LED display screen, which comprises a MOS transistor Q1, a triode Q2, a diode D1, an inductor L1 and a chip U1, wherein:
the pole G of the MOS tube Q1 is used for being externally connected and inputting a starting signal GPIO_IN, the pole D of the MOS tube Q1 is used for being connected with an external power supply to input voltage IN+, the pole S of the MOS tube Q1 is connected with the anode of the diode D1 through the inductor L1, and the cathode of the diode D1 is connected with an output end to be used for outputting voltage OUT+; specifically, the input voltage in+ is positive 5V, and the output voltage out+ is positive 12V, so as to meet the power supply requirement of the conventional LED under the boosting effect, and of course, IN practical application, the input voltage and the output voltage can be properly adjusted according to the requirement;
a resistor R1 and a resistor R2 are connected in series between the cathode of the diode D1 and the ground, and the resistor R1 is connected in parallel with a capacitor C1;
the chip U1 is a DC/DC switching controller, and the model is XC6366B103MR; CE and VDD pin of chip U1 all are connected with MOS pipe Q1's D utmost point, and chip U1's VO pin is connected to on the equipotential tie point between resistance R1 and the resistance R2, and chip U1's EXT pin passes through resistance R3 to be connected to triode Q2's B utmost point, and resistance R3 connects in parallel has electric capacity C2, and triode Q2's C utmost point is connected with diode D1's positive pole, and triode Q2's E utmost point ground.
In order to improve the anti-interference capability, the input and the output of the backlight boost driving circuit are respectively connected with a filter capacitor circuit, and specifically: a capacitor EC1 is connected between the access terminal of the input voltage IN+ and the ground, and a capacitor EC2 is connected between the output terminal of the output voltage OUT+ and the ground.
IN a specific implementation, a resistor R4 is connected between the access terminal of the start signal gpio_in and the D pole of the MOS transistor Q1, and a resistor R5 is connected between the access terminal of the start signal gpio_in and the G pole of the MOS transistor Q1.
While particular embodiments of the present utility model have been described above, it will be appreciated by those skilled in the art that these are merely illustrative, and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined only by the appended claims.
Claims (7)
1. A drive circuit that steps up in a poor light for LED display screen, its characterized in that includes MOS pipe Q1, triode Q2, diode D1, inductance L1 and chip U1, wherein:
the pole G of the MOS tube Q1 is used for being externally connected and inputting a starting signal GPIO_IN, the pole D of the MOS tube Q1 is used for being connected with an external power supply to input voltage 1N+, the pole S of the MOS tube Q1 is connected with the anode of the diode D1 through an inductor L1, and the cathode of the diode D1 is connected with an output end to be used for outputting voltage OUT+;
a resistor R1 and a resistor R2 are connected in series between the cathode of the diode D1 and the ground;
the chip U1 is a DC/DC switching controller, and the model is XC6366B103MR; CE and VDD pin of chip U1 all are connected with MOS pipe Q1's D utmost point, and chip U1's VO pin is connected to on the equipotential tie point between resistance R1 and the resistance R2, and chip U1's EXT pin passes through resistance R3 to be connected to triode Q2's B utmost point, and triode Q2's C utmost point is connected with diode D1's positive pole, and triode Q2's E utmost point ground.
2. The backlight boost driving circuit for an LED display screen of claim 1, wherein the input voltage in+ is positive 5V and the output voltage out+ is positive 12V.
3. A backlight boost driving circuit for an LED display screen according to claim 1, wherein the resistor R1 is connected in parallel with a capacitor C1.
4. A backlight boost driving circuit for an LED display screen according to claim 1, wherein the resistor R3 is connected in parallel with a capacitor C2.
5. The backlight boost driving circuit for an LED display screen according to claim 1, wherein a capacitor EC1 is connected between the input terminal of the input voltage in+ and ground.
6. The backlight boost driving circuit for an LED display screen according to claim 1, wherein a capacitor EC2 is connected between the output terminal of the output voltage out+ and ground.
7. The backlight boosting driving circuit for an LED display screen according to any one of claims 1 to 6, wherein a resistor R4 is connected between the access terminal of the start signal gpio_in and the D pole of the MOS transistor Q1, and a resistor R5 is connected between the access terminal of the start signal gpio_in and the G pole of the MOS transistor Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321148698.2U CN219609999U (en) | 2023-05-12 | 2023-05-12 | Backlight boosting drive circuit for LED display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321148698.2U CN219609999U (en) | 2023-05-12 | 2023-05-12 | Backlight boosting drive circuit for LED display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219609999U true CN219609999U (en) | 2023-08-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321148698.2U Active CN219609999U (en) | 2023-05-12 | 2023-05-12 | Backlight boosting drive circuit for LED display screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219609999U (en) |
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2023
- 2023-05-12 CN CN202321148698.2U patent/CN219609999U/en active Active
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