Dynamic energy-saving chip of LED display screen and connecting structure

A LED display, dynamic technology, applied to static indicators, instruments, etc., can solve problems such as abnormal display, and achieve the effect of saving standby power consumption and reducing static power consumption

Pending Publication Date: 2020-07-03

SHENZHEN FM ELECTRONICS GRP CO LTD

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AI-Extracted Technical Summary

Problems solved by technology

At this time, the LED display driver chip needs to immediately exit the standby state and enter the normal working state. However, it takes a certain amount o...

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Method used

[0037] Specifically, the input clock of the standby detection module is an oscillator output, and the oscillator is a high-frequency oscillator, and the high-frequency oscillator can reduce the error of detection time. When the grayscale data transmitted to the dynamic energy-saving chip of the current LED display is all 0 data, but the grayscale data of the dynamic energy-saving chip of the subsequent LED display is non-zero data, because the grayscale data of the dynamic energy-saving chip of the subsequent LED display It needs to go through the shift register of the current LED display dynamic energy-saving chip, so the current LED display dynamic energy-saving chip detects that the grayscale data in the shift register is non-zero data, and the current LED display dynam...

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Abstract

The invention provides a dynamic energy-saving chip of an LED display screen. Two input ends of a shift register and a data output end of the shift register are respectively used as a data input port,a clock input port and a data output port of the dynamic energy-saving chip of the LED display screen; the display output end of the shift register is respectively connected to the input end of the latch and the input end of the gray scale data detection module, the output end of the gray scale data detection module is connected to one input end of the receiver detection module, and the output end of the oscillator is connected to the other input end of the receiver detection module; the output end of the latch is connected to the LED constant-current driving module; the output end of the standby detection module is respectively connected to the LED constant-current driving module and the constant-current setting module; the output end of the LED constant-current driving module serves asa driving output port of the LED display screen dynamic energy-saving chip. The LED display screen dynamic energy-saving chip can be suitable for an LED display screen, standby energy consumption of the LED display screen when the LED display screen does not work is better reduced, and the energy-saving performance is better.

Application Domain

Static indicating devices

Technology Topic

EngineeringData input +4

Image

Examples

Experimental program(3)

Example Embodiment

[0032] Example one:

[0033] A dynamic energy-saving chip for LED display, see figure 1 , Including shift register 1, latch 3, gray data detection module 4, oscillator 2, standby detection module 5, LED constant current drive module 6 and constant current setting module 7;

[0034] Among them, one input of the shift register 1 is used as the data input port SDI of the LED display dynamic energy-saving chip, and the other input of the shift register 1 is used as the clock input port CLK of the LED display dynamic energy-saving chip. The data output terminal is used as the data output port SDO of the LED display dynamic energy-saving chip;

[0035] The display output terminal of the shift register 1 is respectively connected to the input terminal of the latch 3 and the input terminal of the gray-scale data detection module 4, and the output terminal of the gray-scale data detection module 4 receives an input terminal of the machine detection module 5. The output terminal of the oscillator 2 clk the other input terminal of the reception machine detection module;

[0036] The output terminal of the latch 3 is connected to the LED constant current drive module 6; the output terminal of the standby detection module 5 is respectively connected to the LED constant current drive module 6 and the constant current setting module 7; LED constant current The output end of the drive module is used as the drive output port (OUT1~OUT15) of the dynamic energy-saving chip of the LED display screen. Between the other output terminal of the shift register 1 and the input terminal of the latch 3, between the other output terminal of the shift register 1 and the input terminal of the gray data detection module 4, and the latch The output terminal of 3 and the LED constant current drive module 6 are all connected by bus.

[0037] Specifically, the input clock of the standby detection module is an oscillator output, and the oscillator is a high-frequency oscillator. The use of a high-frequency oscillator can reduce the error of the detection time. When the gray data transmitted to the current LED display dynamic energy-saving chip is all 0 data, but the gray data of the subsequent LED display dynamic energy-saving chip is non-zero data, because the gray data of the subsequent LED display dynamic energy-saving chip Need to go through the shift register of the current LED display dynamic energy-saving chip, so the current LED display dynamic energy-saving chip detects that the grayscale data in the shift register is non-zero data, the current LED display dynamic energy-saving chip still works normally and does not enter standby status.

[0038] The constant current setting module is used to set the constant current value of the LED constant current drive output according to the external resistance of the REXT terminal. The LED constant current drive module determines the 16 drive signals (OUT0-OUT15) output by the drive output port according to the constant current value set by the constant current setting module, the latched data and the input OE signal. The drive output port is used for Drive the negative electrode of the LED in the LED display to realize the gray control of the LED.

[0039] The LED display dynamic energy-saving chip detects the gray data output by the shift register. Compared with the existing technology for detecting the data output by the latch, this chip can make the LED display dynamic energy-saving chip detect the gray data earlier Value, which is beneficial to the dynamic energy-saving chip of the LED display screen to restore the normal working state in advance to avoid affecting the normal working display.

[0040] If the LED display dynamic energy-saving chip provided in this embodiment is applied in a cascade system, the current LED display dynamic energy-saving chip will enter the standby state only after all the subsequent LED display dynamic energy-saving chips enter the standby state. All the LED display dynamic energy-saving chips in the cascade system will be unified into the standby state or the normal working state.

[0041] With the LED display dynamic energy-saving chip provided in this embodiment, when the LED display screen is black, all the LED display dynamic energy-saving chips enter the standby state, reducing the static power consumption of the chip, thereby saving the standby power consumption of the LED display system. Once the shift register in the LED display dynamic energy-saving chip receives non-zero data, the LED display dynamic energy-saving chip starts to respond, and the normal working state can be restored after the data is locked, making the LED display dynamic energy-saving chip smarter and more Energy saving.

[0042] See figure 2 , The display output terminal of the shift register includes N display output ports; the gray data detection module includes M NOR gates and an AND gate, wherein the total number of input terminals of all NOR gates is N, and the The number of input terminals is M;

[0043] The N display output ports of the shift register are connected to different input terminals of the NOR gate, and the output terminals of different NOR gates are connected to different input terminals of the AND gate. The output terminal of the AND gate is used as a gray-scale data detection module. The output terminal. The gray data detection module is a 16bit gray data detection module, and N is 16. The NOR gate is provided with 2 input terminals, and M is 8.

[0044] Specifically, the shift register outputs 16bit grayscale data, and transmits the 16bit grayscale data to the grayscale data detection module. When the gray data detection module detects that the 16bit gray data is all 0, it outputs 1 and enables the standby detection module, so that the LED display dynamic energy-saving chip enters the standby state. When it is detected that the 16bit gray scale data is not all 0, 0 is output, and the standby detection module is reset, so that the dynamic energy-saving LED display chip enters the normal working state. The gray data detection module uses multiple two-input NOR gates mainly based on layout considerations, which can reduce layout routing.

[0045] See image 3 The standby detection module includes a plurality of D flip-flops connected in series; the output end of the gray-scale data detection module is respectively connected to the enable end of each D flip-flop and the data input end of the last D flip-flop. The clock terminal of a D flip-flop is connected to the output terminal of the oscillator, and the data output terminal of the last D flip-flop is used as the output terminal of the standby detection module;

[0046] In other D flip-flops except the last D flip-flop, the inverted data output port of each D flip-flop is connected to the clock terminal and the data input terminal of the next D flip-flop respectively.

[0047] Specifically, the data output port Q=D of the D flip-flop at the rising edge of clk, the inverted data output port QB=~Q (Q is inverted) keep the output unchanged at other times. When the timing time is reached, the enable terminal R and the data input terminal D of the last D flip-flop are both high, then the data output port Q outputs a high level, enabling the LED display dynamic energy-saving chip to enter the standby mode, otherwise Maintain low level.

[0048] When the gray data detection module outputs 1 and the standby detection module is enabled, the timing circuit in the standby detection module starts to work, so that the gray data detection module outputs 1 and continues for a period of time, and the standby detection module outputs a shutdown enable level signal , Turn off the LED constant current drive module and constant current setting module, so that the LED display dynamic energy-saving chip enters the standby state.

[0049] The standby detection module is in the process from the gray data detection module output 1 to the standby detection module output turn-off enable level signal, if the gray data in the shift register is not all 0, the standby detection module immediately resets the timing circuit, The standby detection module maintains the output of the turn-on enable level signal to continue to keep the LED display dynamic energy-saving chip in the normal working state. In this way, after the non-zero grayscale data is latched into the latch, the dynamic energy-saving chip of the LED display screen is already in a normal working state, and the grayscale data can be displayed normally.

[0050] When the black screen state of the LED display is very short, in order to prevent the LED display dynamic energy-saving chip from entering the standby state, it will soon return to the normal working state. The standby detection module requires the gray data detection module to output 1 and lasts for a set time before the standby detection module outputs the shutdown enable signal, so that the LED display dynamic energy-saving chip enters the standby state and prevents the LED display dynamic energy-saving chip from being Frequent switching between standby state and normal working state to achieve energy saving.

Example Embodiment

[0051] Embodiment two:

[0052] A connection structure for a dynamic energy-saving chip of an LED display screen, comprising a piece of the above-mentioned dynamic energy-saving chip for an LED display screen;

[0053] Among them, the data input port of the dynamic energy-saving chip of the LED display is connected to external gray data, the clock input port of the dynamic energy-saving chip of the LED display is connected to an external clock signal, and the drive output port of the dynamic energy-saving chip of the LED display drives the LED display.

[0054] The connection structure provided by the embodiment of the present invention is briefly described. For the parts not mentioned in the embodiment, please refer to the corresponding content in the foregoing product embodiment.

Example Embodiment

[0055] Embodiment three:

[0056] A connection structure for LED display dynamic energy-saving chips, including K pieces of the above-mentioned LED display dynamic energy-saving chips;

[0057] All LED display dynamic energy-saving chips are connected in series; the data input port of the first LED display dynamic energy-saving chip is connected to external gray data, and the clock input port of all LED display dynamic energy-saving chips is connected to an external clock signal;

[0058] Except for the last one of the LED display dynamic energy-saving chip, the data output port of the LED display dynamic energy-saving chip is connected to the data input port of the next LED display dynamic energy-saving chip, and all LED displays are dynamically energy-saving The drive output port of the chip drives the LED display.

[0059] Specifically, in the connection structure of the present invention, multiple LED display dynamic energy-saving chips are cascaded, and the previous LED display dynamic energy-saving chip receives gray data input, and simultaneously outputs SDO signals, and transmits gray data to the next A dynamic energy-saving chip for LED display.

[0060] The connection structure provided by the embodiment of the present invention is briefly described. For the parts not mentioned in the embodiment, please refer to the corresponding content in the foregoing product embodiment.

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Description & Claims & Application Information

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