CN203596162U

CN203596162U - Energy-saving LED display screen

Info

Publication number: CN203596162U
Application number: CN201320393205.1U
Authority: CN
Inventors: 郭昆鹏
Original assignee: SHENZHEN CHUANGCAIYUAN ELECTRONIC TECHNOLOGY CO LTD
Current assignee: SHENZHEN CHUANGCAIYUAN ELECTRONIC TECHNOLOGY CO LTD
Priority date: 2013-07-03
Filing date: 2013-07-03
Publication date: 2014-05-14
Anticipated expiration: 2023-07-03

Abstract

The utility model discloses an energy-saving LED display screen, and the display screen comprises an MCU, a bus transceiver, a constant current driver, and a full-color LED module group, wherein the MCU, the bus transceiver, the constant current driver and the full-color LED module group are sequentially connected together. A control instruction transmitted by the MCU is transmitted to the constant current driver through the bus transceiver. The constant current driver carries out the control instruction and outputs a constant direct-current voltage to the full-color LED module group. The full-color LED module group comprises a plurality of red LEDs, green LEDs, and blue LEDs. The negative electrodes of the red, green and blue LEDs are respectively connected to the constant signal output end of the constant current driver. The positive electrodes of the green LEDs and the positive electrodes of the blue LEDs are connected with each other and then connected to a first power end Vin1. The positive electrodes of the red LEDs are connected to a second power end Vin2. The output voltage of the first power end Vin1 is higher than the output voltage of the second power end Vin2. The LED display screen avoids that all LED are working states of higher voltages, thereby saving electric energy and effectively limiting the increase of temperature.

Description

A kind of energy-saving LED display screen

Technical field

The utility model relates to a kind of LED display, relates in particular to a kind of energy-saving LED display screen.

Background technology

Along with the high speed development of LED display technique, large scale integrated circuit and computer technology, LED display becomes a kind of emerging display media already, compare the display medias such as traditional colorful neon bulb, image elements diode video wall, four look magnetic turnover panels, advantages such as LED display is high with brightness, dynamic image display effect is good, fault is low, less energy consumption, long service life, displaying contents is various, display mode is abundant, the ratio of performance to price is high and be widely used in all trades and professions.Particularly gray scale display screen shows for enterprises and institutions' image publicity and public place information with its modern attitude, has become the display media can not be substituted.

Existing LED display, mostly adopt the power supply mode of single power supply, be that red LED, green LED and blue LED all obtain identical supply voltage, operating voltage difference due to three kinds of LED: the operating voltage of red LED is+2V left and right, the operating voltage of green LED and blue LED is+3V left and right, so be at least greater than+3V of the driving voltage of this LED display, make the duty of red LED in high voltage, not only waste electric energy, and its temperature will raise, make the inner member of LED display easily produce harmful effect because temperature is floated.

Utility model content

The technical problems to be solved in the utility model is, a kind of energy-saving LED display screen is provided, red LED in this LED display, green LED and blue LED can obtain respectively corresponding supply voltage, thereby all duties in high voltage of each LED are avoided, not only save electric energy, also effectively limited temperature rise.

For solving the problems of the technologies described above, the utility model adopts following technical scheme.

A kind of energy-saving LED display screen, it includes the MCU connecting successively, bus transceiver, constant-flow driver and all-colour LED module, the steering order that described MCU sends transfers to constant-flow driver by bus transceiver, described constant-flow driver is carried out the DC voltage of this steering order stable output to all-colour LED module, described all-colour LED module includes multiple red LED, green LED and blue LED, three's negative electrode is connected to the constant current signal output terminal of constant-flow driver, after interconnecting, the anode of described green LED and the anode of blue LED be connected in the first power end Vin1, the anodic bonding of described red LED is in second source end Vin2, the output voltage of described the first power end Vin1 is higher than the output voltage of second source end Vin2.

Preferably, the output voltage of described the first power end Vin1 is+3.8V that the output voltage of described second source end Vin2 is+2.8V.

Preferably, described bus transceiver includes multiple bus driver chips, and the model of described bus driver chip is 74HC245.

Preferably, described constant-flow driver includes multiple constant-current driven chips, and the model of described constant-current driven chip is MBI5035.

Preferably, described constant-flow driver also includes multiple current-limiting resistances, and the red LED current drive signal of described constant-current driven chip output transfers to the negative electrode of red LED by this current-limiting resistance.

In the disclosed energy-saving LED display screen of the utility model, by the adjusting to the first power end Vin1 and second source end Vin2 output voltage, make red LED, green LED and blue LED can obtain respectively corresponding supply voltage, thereby avoided all duties in high voltage of each LED.Can find out according to technique scheme, the utility model compared to existing technologies, has not only been saved electric energy, has also effectively controlled temperature rise, and can avoid the inner member of LED display to produce harmful effect because temperature is floated.

Accompanying drawing explanation

Fig. 1 is the circuit block diagram of the energy-saving LED display screen that the utility model proposes.

Fig. 2 is the local circuit schematic diagram of all-colour LED module.

Fig. 3 is the local circuit schematic diagram of bus transceiver.

Fig. 4 is the local circuit schematic diagram of constant-flow driver.

Fig. 5 is the local circuit schematic diagram of current-limiting resistance in constant-flow driver.

Embodiment

Below in conjunction with drawings and Examples, the utility model is described in more detail.

The utility model discloses a kind of energy-saving LED display screen, as shown in Figure 1, it includes the MCU1, bus transceiver 2, constant-flow driver 3 and the all-colour LED module 4 that connect successively, the steering order that MCU1 sends transfers to constant-flow driver 3 by bus transceiver 2, this bus transceiver 2 is for improving the carrying load ability of MCU1, and the DC voltage that constant-flow driver 3 is carried out this steering order stable output is to all-colour LED module 4.

With reference to Fig. 1, Fig. 2 and Fig. 4, all-colour LED module 4 includes multiple red LED, green LED and blue LED, three's negative electrode is connected to the constant current signal output terminal of constant-flow driver 3, after interconnecting, the anode of green LED and the anode of blue LED be connected in the first power end Vin1, the anodic bonding of red LED is in second source end Vin2, and the output voltage of the first power end Vin1 is higher than the output voltage of second source end Vin2.

Because the operating voltage of red LED is+2V left and right, the operating voltage of green LED and blue LED is+3V left and right, so in order to guarantee that three kinds of LED all can normally work, in the present embodiment, the output voltage of the first power end Vin1 is+3.8V that the output voltage of second source end Vin2 is+2.8V.

For multiple LED are controlled, with reference to Fig. 1 and Fig. 3, bus transceiver 2 includes multiple bus driver chips, the model of bus driver chip is preferably 74HC245, this bus driver chip be provided with 8 input port A0-A7 and with input port 8 output port B0-B7 one to one, for example, bus driver chip U1 is one of multiple bus driver chips, can improve the carrying load ability of its input signal by this bus driver chip U1.With reference to Fig. 1, Fig. 2 and Fig. 4, constant-flow driver 3 includes multiple constant-current driven chips, the model of constant-current driven chip is preferably MBI5035, the output port OUT0-OUT15 of this constant-current driven chip is used for exporting 16 tunnel constant currents and drives signal, for example, can utilize constant-current driven chip UR1 for red LED provides drive current, utilize constant-current driven chip UG1 for green LED provides drive current, utilize constant-current driven chip UB1 to provide drive current for blue LED.But, selecting these two kinds of chips is the utility model preferred embodiment, be not limited to the utility model, in other embodiment of the present utility model, bus driver chip and constant-current driven chip can also be selected the chip with equal driving force of other models.

For red LED being carried out to current limliting and restriction temperature rise, with reference to Fig. 1 and Fig. 5, constant-flow driver 3 also includes multiple current-limiting resistances, and the red LED current drive signal of constant-current driven chip output transfers to the negative electrode of red LED by this current-limiting resistance.

In the disclosed energy-saving LED display screen of the utility model, by the adjusting to the first power end Vin1 and second source end Vin2 output voltage, make red LED, green LED and blue LED can obtain respectively corresponding supply voltage, thereby all duties in high voltage of each LED are avoided, not only save electric energy, also effectively control temperature rise, and can avoid the inner member of LED display to produce harmful effect because temperature is floated.

The above is the utility model preferred embodiment, is not limited to the utility model, all modifications of making in technical scope of the present utility model, is equal to and replaces or improvement etc., all should be included in the scope that the utility model protects.

Claims

1. an energy-saving LED display screen, it is characterized in that, include the MCU connecting successively, bus transceiver, constant-flow driver and all-colour LED module, the steering order that described MCU sends transfers to constant-flow driver by bus transceiver, described constant-flow driver is carried out the DC voltage of this steering order stable output to all-colour LED module, described all-colour LED module includes multiple red LED, green LED and blue LED, three's negative electrode is connected to the constant current signal output terminal of constant-flow driver, after interconnecting, the anode of described green LED and the anode of blue LED be connected in the first power end Vin1, the anodic bonding of described red LED is in second source end Vin2, the output voltage of described the first power end Vin1 is higher than the output voltage of second source end Vin2.

2. energy-saving LED display screen as claimed in claim 1, is characterized in that, the output voltage of described the first power end Vin1 is+3.8V that the output voltage of described second source end Vin2 is+2.8V.

3. energy-saving LED display screen as claimed in claim 1, is characterized in that, described bus transceiver includes multiple bus driver chips, and the model of described bus driver chip is 74HC245.

4. energy-saving LED display screen as claimed in claim 1, is characterized in that, described constant-flow driver includes multiple constant-current driven chips, and the model of described constant-current driven chip is MBI5035.

5. energy-saving LED display screen as claimed in claim 4, is characterized in that, described constant-flow driver also includes multiple current-limiting resistances, and the red LED current drive signal of described constant-current driven chip output transfers to the negative electrode of red LED by this current-limiting resistance.