CN211240182U - Novel LED display screen's module of being shaded altogether - Google Patents
Novel LED display screen's module of being shaded altogether Download PDFInfo
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- CN211240182U CN211240182U CN201921947920.9U CN201921947920U CN211240182U CN 211240182 U CN211240182 U CN 211240182U CN 201921947920 U CN201921947920 U CN 201921947920U CN 211240182 U CN211240182 U CN 211240182U
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Abstract
The utility model discloses a novel common-cathode module of an LED display screen, which comprises a power supply, a voltage reduction circuit, a red lamp driving circuit, a green lamp driving circuit, a blue lamp driving circuit, a red lamp group, a green lamp group and a blue lamp group; the power supply supplies direct current to the green lamp driving circuit and the blue lamp driving circuit, and the green lamp driving circuit and the blue lamp driving circuit respectively supply power to the green lamp group and the blue lamp group; the power supply supplies power to the voltage reduction circuit by direct current, the voltage reduction circuit adjusts the voltage of the direct current and supplies power to the red light driving circuit, and the red light driving circuit supplies power to the red light group. The utility model discloses in, power supply direct power supply gives green lamp drive circuit, blue lamp drive circuit, and rethread step-down circuit reduces power supply's voltage and supplies power for red lamp drive circuit, can reach R, GB separately supplies power, and accurate distribution voltage electric current is to red, green blue banks, only needs to be equipped with a step-down integrated chip U, realizes cold screen in cloudy altogether, has reduced component cost and cost of manufacture.
Description
Technical Field
The utility model relates to a LED display screen technical field especially indicates a novel LED display screen's module of being shaded altogether.
Background
The conventional LED display screen generally comprises three lamp beads of red, green and blue. Wherein, the voltage requirement of the red light bead is lower than the voltage requirements of the other two kinds of light beads. Generally, the voltage of a red light bead is required to be about 2.5V, and the voltage of a blue light bead and a green light bead is required to be about 3.8V.
The common-cathode cold screen adopts R, GB separated power supply, namely, voltage and current are accurately distributed to the red lamp bead and the green lamp bead, the current passes through the lamp beads and then reaches the IC cathode, the forward voltage is reduced, and the conduction internal resistance is small. The separated power supply scheme effectively reduces the power consumption and greatly reduces the heat generated in the working process of the display screen.
An authorization publication No. CN201489799U discloses a power supply circuit. The power supply circuit comprises a switching power supply, a voltage adjusting circuit and a constant current source. The voltage adjusting circuit is used for adjusting the direct-current voltage provided by the switching power supply and then applying the adjusted direct-current voltage to each LED, and the constant current source is used for keeping the current flowing through each LED constant. The voltage adjusting circuit comprises three voltage-reducing conversion sub-circuits, the green light LED, the blue light LED and the red light LED are respectively and correspondingly connected with one of the three voltage-reducing conversion sub-circuits, and the three voltage-reducing conversion sub-circuits respectively provide driving voltages required for driving the green light LED, the blue light LED and the red light LED.
It can be seen that the power supply circuit in this patent has three buck conversion sub-circuits, and three integrated chips are required. This greatly increases the component cost and the manufacturing cost.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is according to above-mentioned prior art not enough, provide a novel LED display screen's negative module altogether, solved component cost, problem that the cost of manufacture is high.
The technical scheme of the utility model is realized like this:
a common-cathode module of a novel LED display screen comprises a power supply, a voltage reduction circuit, a red lamp driving circuit, a green lamp driving circuit, a blue lamp driving circuit, a red lamp group, a green lamp group and a blue lamp group; the power supply supplies direct current to the green lamp driving circuit and the blue lamp driving circuit, and the green lamp driving circuit and the blue lamp driving circuit respectively supply power to the green lamp group and the blue lamp group; the power supply supplies power to the direct current to the voltage reduction circuit, the voltage reduction circuit adjusts the voltage of the direct current and supplies power to the red light driving circuit, and the red light driving circuit supplies power to the red light group.
Furthermore, the voltage output end of the power supply is connected in parallel with the voltage input ends of the green lamp driving circuit, the blue lamp driving circuit and the voltage reduction circuit; the voltage output ends of the green lamp driving circuit and the blue lamp driving circuit are respectively connected with the green lamp group and the blue lamp group, and the voltage output end of the voltage reducing circuit is sequentially connected with the red lamp driving circuit and the red lamp group.
Further, the power supply converts 220V/50HZ alternating current input by an external power grid into 3.8V direct current, and the voltage reduction circuit adjusts the 3.8V direct current into 2.8V direct current.
Furthermore, the voltage reduction circuit is arranged on a patch panel of the LED display screen or a display lamp panel.
Further, the voltage reduction circuit comprises a voltage reduction integrated chip U, an inductor L and a capacitor C1; the voltage input end of the voltage-reducing integrated chip U is connected with the voltage output end of the power supply circuit, the voltage output end of the voltage-reducing integrated chip U is connected with the inductor L in series, the other end of the inductor L is connected with the voltage input ends of the capacitor C1 and the red light driving circuit in parallel, and the other end of the capacitor C1 is connected with the ground wire.
Furthermore, the voltage reduction circuit also comprises a resistor R1, and the resistor R1 is connected in series between the voltage output end of the power supply circuit and the open-drain logic output end of the voltage reduction integrated chip U.
Furthermore, the voltage reduction circuit also comprises a resistor R2 and a capacitor C2; one end of the resistor R2 and one end of the capacitor C2 are connected with a voltage input end of the power supply circuit in parallel, the other end of the resistor R2 is connected with an enabling end of the voltage-reducing integrated chip U, and the other end of the C2 is connected with a ground wire.
Furthermore, the voltage reduction circuit also comprises an output feedback sub-circuit, and the output feedback sub-circuit comprises a resistor R3 and a resistor R4; the voltage input end of the resistor R3 is connected to the voltage output end of the inductor L, the voltage output end of the resistor R4 is grounded, and the voltage output end of the resistor R3 and the voltage input end of the resistor R4 are connected in parallel to the voltage feedback end of the voltage-reducing integrated chip U.
Adopt above-mentioned technical scheme, the beneficial effects of the utility model reside in that: the power supply directly supplies power to the green lamp driving circuit and the blue lamp driving circuit, the voltage of the power supply is reduced and the power is supplied to the red lamp driving circuit through the voltage reduction circuit, R, GB separated power supply can be achieved, voltage and current are accurately distributed to the red lamp set and the green lamp set, only one voltage reduction integrated chip U needs to be equipped, a common cathode cold screen is achieved, and element cost and manufacturing cost are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a circuit block diagram of an embodiment.
FIG. 2 is a circuit diagram of a voltage step-down circuit in an embodiment.
In the figure, 10-power supply, 20-voltage reduction circuit, 30-red light drive circuit, 40-green light drive circuit, 50-blue light drive circuit, 31-red light group, 41-green light group and 51-blue light group.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, in the embodiment provided by the present invention, a common-cathode module of a novel LED display screen includes a power supply 10, a voltage-reducing circuit 20, a red light driving circuit 30, a green light driving circuit 40, a blue light driving circuit 50, a red light group 31, a green light group 41, and a blue light group 51; the power supply 10 supplies direct current to the green lamp driving circuit 40 and the blue lamp driving circuit 50, and the green lamp driving circuit 40 and the blue lamp driving circuit 50 respectively supply power to the green lamp group 41 and the blue lamp group 51; the power supply 10 supplies the direct current to the voltage-reducing circuit 20, the voltage-reducing circuit 20 adjusts the voltage of the direct current and supplies the adjusted direct current to the red light driving circuit 30, and the red light driving circuit 30 supplies the red light group 31.
The voltage output end of the power supply 10 is connected in parallel with the voltage input ends of the green lamp driving circuit 40, the blue lamp driving circuit 50 and the voltage reduction circuit 20; the voltage output ends of the green lamp driving circuit 40 and the blue lamp driving circuit 50 are respectively connected to the green lamp group 41 and the blue lamp group 51, and the voltage output end of the voltage reducing circuit 20 is sequentially connected to the red lamp driving circuit 30 and the red lamp group 31.
Specifically, the power supply 10 converts 220V/50HZ alternating current input by the external power grid into 3.8V direct current, and the voltage reduction circuit 20 adjusts the 3.8V direct current into 2.8V direct current.
The voltage reduction circuit 20 is arranged on the adapter plate of the LED display screen or the display lamp panel. In this embodiment, it is preferable that the step-down circuit 20 is disposed on a display panel of the LED display panel.
As shown in fig. 2, the voltage-reducing circuit 20 includes a voltage-reducing integrated chip U, an inductor L, and a capacitor C1; the voltage input end of the voltage-reducing integrated chip U is connected with the voltage output end RC of the power supply circuit, the voltage output end of the voltage-reducing integrated chip U is connected with the inductor L in series, the other end of the inductor L is connected with the capacitor C1 and the voltage input end DC of the red light driving circuit 30 in parallel, and the other end of the capacitor C1 is connected with the ground wire. The number of the capacitors C1 may be multiple, and the capacitance values are different.
The voltage-reducing circuit 20 further includes a resistor R1, and the resistor R1 is connected in series between the voltage output terminal of the power supply circuit and the open-drain logic output terminal of the voltage-reducing integrated chip U.
The voltage reduction circuit 20 further comprises a resistor R2 and a capacitor C2; one end of the resistor R2 and one end of the capacitor C2 are connected with a voltage input end of the power supply circuit in parallel, the other end of the resistor R2 is connected with an enabling end of the voltage-reducing integrated chip U, and the other end of the C2 is connected with a ground wire. The number of the capacitors C2 may be multiple, and the capacitance values are different.
The voltage reduction circuit 20 further comprises an output feedback sub-circuit, wherein the output feedback sub-circuit comprises a resistor R3 and a resistor R4; the voltage input end of the resistor R3 is connected to the voltage output end of the inductor L, the voltage output end of the resistor R4 is grounded, and the voltage output end of the resistor R3 and the voltage input end of the resistor R4 are connected in parallel to the voltage feedback end of the voltage-reducing integrated chip U.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A common-cathode module of a novel LED display screen comprises a power supply, a voltage reduction circuit, a red lamp driving circuit, a green lamp driving circuit, a blue lamp driving circuit, a red lamp group, a green lamp group and a blue lamp group; the method is characterized in that: the power supply supplies direct current to the green lamp driving circuit and the blue lamp driving circuit, and the green lamp driving circuit and the blue lamp driving circuit respectively supply power to the green lamp group and the blue lamp group; the power supply supplies power to the direct current to the voltage reduction circuit, the voltage reduction circuit adjusts the voltage of the direct current and supplies power to the red light driving circuit, and the red light driving circuit supplies power to the red light group.
2. The common negative module of the novel LED display screen as claimed in claim 1, wherein: the voltage output end of the power supply is connected with the voltage input ends of the green lamp driving circuit, the blue lamp driving circuit and the voltage reduction circuit in parallel; the voltage output ends of the green lamp driving circuit and the blue lamp driving circuit are respectively connected with the green lamp group and the blue lamp group, and the voltage output end of the voltage reducing circuit is sequentially connected with the red lamp driving circuit and the red lamp group.
3. The common negative module of the novel LED display screen as claimed in claim 1, wherein: the power supply converts 220V/50HZ alternating current input by an external power grid into 3.8V direct current, and the voltage reduction circuit adjusts the 3.8V direct current into 2.8V direct current.
4. The common negative module of the novel LED display screen as claimed in claim 1, wherein: the voltage reduction circuit is arranged on the adapter plate of the LED display screen or the display lamp panel.
5. The common negative module of the novel LED display screen as claimed in claim 1, wherein: the voltage reduction circuit comprises a voltage reduction integrated chip U, an inductor L and a capacitor C1; the voltage input end of the voltage-reducing integrated chip U is connected with the voltage output end of the power supply circuit, the voltage output end of the voltage-reducing integrated chip U is connected with the inductor L in series, the other end of the inductor L is connected with the voltage input ends of the capacitor C1 and the red light driving circuit in parallel, and the other end of the capacitor C1 is connected with the ground wire.
6. The novel common-negative module of the LED display screen as claimed in claim 5, wherein: the voltage reduction circuit further comprises a resistor R1, and the resistor R1 is connected in series between the voltage output end of the power supply circuit and the open-drain logic output end of the voltage reduction integrated chip U.
7. The novel common-negative module of the LED display screen as claimed in claim 5, wherein: the voltage reduction circuit also comprises a resistor R2 and a capacitor C2; one end of the resistor R2 and one end of the capacitor C2 are connected with a voltage input end of the power supply circuit in parallel, the other end of the resistor R2 is connected with an enabling end of the voltage-reducing integrated chip U, and the other end of the C2 is connected with a ground wire.
8. The novel common-negative module of the LED display screen as claimed in claim 5, wherein: the voltage reduction circuit also comprises an output feedback sub-circuit, and the output feedback sub-circuit comprises a resistor R3 and a resistor R4; the voltage input end of the resistor R3 is connected to the voltage output end of the inductor L, the voltage output end of the resistor R4 is grounded, and the voltage output end of the resistor R3 and the voltage input end of the resistor R4 are connected in parallel to the voltage feedback end of the voltage-reducing integrated chip U.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921947920.9U CN211240182U (en) | 2019-11-13 | 2019-11-13 | Novel LED display screen's module of being shaded altogether |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921947920.9U CN211240182U (en) | 2019-11-13 | 2019-11-13 | Novel LED display screen's module of being shaded altogether |
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| CN211240182U true CN211240182U (en) | 2020-08-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921947920.9U Active CN211240182U (en) | 2019-11-13 | 2019-11-13 | Novel LED display screen's module of being shaded altogether |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382231A (en) * | 2020-11-12 | 2021-02-19 | 东莞阿尔泰显示技术有限公司 | Adapter plate compatible with common cathode lamp panel and common anode lamp panel |
-
2019
- 2019-11-13 CN CN201921947920.9U patent/CN211240182U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382231A (en) * | 2020-11-12 | 2021-02-19 | 东莞阿尔泰显示技术有限公司 | Adapter plate compatible with common cathode lamp panel and common anode lamp panel |
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