LED display circuit and LED display screen

Abstract

An LED display circuit and an LED display screen, when receiving a video signal through a control circuit, output a display signal and a display data compensation signal according to the video signal; a video encoding and decoding circuit decodes the display signal into multiple groups of sub-display signals and outputs them; multiple display modules display according to the power supply voltage and the sub-display signals; the sub-display signals are input to the display modules in a one-to-one correspondence; a compensation circuit compensates the power of the power supply voltage according to the display data compensation signal; since the display data compensation signal is generated according to the video signal, and the compensation circuit compensates the power of the power supply voltage according to the display data compensation signal, the power fluctuation of the power supply voltage is reduced, and the electromagnetic radiation is reduced.

Description

Technical Field

[0001] The present application belongs to the field of display devices, and in particular, relates to an LED display circuit and an LED display screen. Background Art

[0002] The traditional LED display circuit includes a control circuit, a video codec circuit, and multiple display modules; when the control circuit receives a video signal, it outputs a display signal according to the video signal; the video codec circuit outputs multiple groups of sub-display signals according to the display signal; multiple display modules display according to the power supply voltage and the sub-display signal; because the LED display circuit is current driven, as the pattern changes, the current and power consumption also fluctuate violently, and the changing current will generate a fluctuating magnetic field, causing the entire device to work in a fluctuating electromagnetic environment. The electronics industry has increasingly higher requirements for electromagnetic compatibility. Although various measures have been taken to reduce electromagnetic radiation, it is still difficult to pass various electromagnetic compatibility demonstrations.

[0003] Since the function of the traditional LED display circuit is limited to the LED display function, it is unable to reduce electromagnetic radiation. Summary of the invention

[0004] The purpose of the present application is to provide an LED display circuit and an LED display screen, aiming to solve the problem that traditional LED display circuits cannot reduce electromagnetic radiation.

[0005] An embodiment of the present application provides an LED display circuit, comprising:

[0006] a control circuit configured to output a display signal and a display data compensation signal according to the video signal when receiving the video signal;

[0007] A video codec circuit, connected to the control circuit, configured to decode the display signal into multiple groups of sub-display signals and output them;

[0008] A plurality of display modules are connected to the video codec circuit and configured to display according to the power supply voltage and the sub-display signal; the sub-display signal is input to the display module in a one-to-one correspondence;

[0009] The compensation circuit is connected to the control circuit and is configured to compensate the power of the supply voltage according to the display data compensation signal.

[0010] In one embodiment, there are multiple compensation circuits, each of which includes multiple compensation sub-circuits. The LED display circuit is provided with multiple sub-display areas, and one sub-display area includes one display module and one compensation sub-circuit connected thereto.

[0011] In one embodiment, the LED display circuit further includes:

[0012] A power supply is connected to the compensation circuit and the plurality of display modules and is configured to provide the power supply voltage.

[0013] In one embodiment, the compensation subcircuit includes:

[0014] A digital-to-analog conversion component, connected to the control circuit, configured to convert the display data compensation signal into an analog adjustment signal;

[0015] A load component is connected to the digital-to-analog conversion component and is configured to compensate the power of the supply voltage according to the analog adjustment signal.

[0016] In one embodiment, the digital-to-analog conversion component includes an analog-to-digital converter and a first capacitor;

[0017] The power supply terminal of the analog-to-digital converter and the first terminal of the first capacitor are commonly connected to the first power supply, the analog reference voltage input terminal of the analog-to-digital converter is connected to the second power supply, the digital serial data input terminal of the analog-to-digital converter and the digital serial clock input terminal of the analog-to-digital converter are connected to the display data compensation signal input terminal of the digital-to-analog conversion component, the analog voltage output terminal of the analog-to-digital converter is connected to the analog adjustment signal output terminal of the digital-to-analog conversion component, and the first terminal of the first capacitor, the chip select terminal of the analog-to-digital converter and the ground terminal of the analog-to-digital converter are commonly connected to the power ground.

[0018] In one embodiment, the load component includes a first transistor, a first resistor and a second resistor;

[0019] The first end of the first resistor is connected to the analog adjustment signal input end of the load component, the second end of the first resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the power supply, and the emitter of the first transistor is connected to the power ground.

[0020] In one embodiment, the control circuit is specifically configured to obtain video image information carried by the video signal, extract the color value of each pixel in the video image information, accumulate the color value of each pixel to obtain a power index, and calculate the average value of the power index within a preset time period before the current time to obtain a reference power index, and calculate the compensation power based on the reference power index and the power index, and generate the display data compensation signal based on the compensation power.

[0021] In one embodiment, the control circuit includes a microprocessor;

[0022] The first data input / output terminal of the microprocessor and the second data input / output terminal of the microprocessor are connected to the display data compensation signal output terminal of the control circuit.

[0023] The present invention also provides an LED display screen, characterized in that it comprises the LED display circuit as described above.

[0024] Compared with the prior art, the embodiments of the present invention have the following beneficial effects: since the display data compensation signal is generated according to the video signal, and the compensation circuit compensates the power of the supply voltage according to the display data compensation signal, the power fluctuation of the supply voltage is reduced and the electromagnetic radiation is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical invention in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of a structure of an LED display circuit provided in one embodiment of the present application;

[0027] Figure 2 Another structural schematic diagram of an LED display circuit provided in an embodiment of the present application;

[0028] Figure 3 Another structural schematic diagram of an LED display circuit provided in an embodiment of the present application;

[0029] Figure 4 A schematic diagram of a structure of a compensation circuit in an LED display circuit provided in an embodiment of the present application;

[0030] Figure 5 A partial exemplary circuit schematic diagram of an LED display circuit provided in an embodiment of the present application;

[0031] Figure 6 A partial exemplary circuit schematic diagram of a video codec circuit in an LED display circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the orientation or position relationship indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] Figure 1 The structure diagram of the LED display circuit provided by the preferred embodiment of the present application is shown. For the convenience of explanation, only the part related to the present embodiment is shown, which is described in detail as follows:

[0037] The LED display circuit includes a control circuit 11 , a video codec circuit 12 , a plurality of display modules 13 i and a compensation circuit 14 .

[0038] The control circuit 11 is configured to output a display signal and a display data compensation signal according to the video signal when receiving the video signal, wherein the display data compensation signal may be a wired communication signal.

[0039] The video codec circuit 12 is connected to the control circuit 11 and is configured to decode the display signal into a plurality of groups of sub-display signals and output them.

[0040] A plurality of display modules 13i are connected to the video codec circuit 12 and are configured to display according to the power supply voltage and the sub-display signals; the sub-display signals are input to the display modules in a one-to-one correspondence.

[0041] The compensation circuit 14 is connected to the control circuit 11 and is configured to compensate the power of the supply voltage according to the display data compensation signal.

[0042] The control circuit 11 is specifically configured to obtain video image information carried by the video signal, extract the color value of each pixel in the video image information, accumulate the color value of each pixel to obtain a power index, and calculate the average value of the power index within a preset time period before the current time to obtain a reference power index, and calculate the compensation power based on the reference power index and the power index, and generate a display data compensation signal based on the compensation power.

[0043] The compensation power is calculated according to the reference power index and the power index as follows: if the difference between the reference power index and the power index is greater than 0, the difference is used as the compensation power; if the difference between the reference power index and the power index is less than 0, the compensation power is set to 0.

[0044] By way of example and not limitation, Figure 2 As shown, the compensation circuit 14 includes a plurality of compensation sub-circuits 140i, the LED display circuit has a plurality of sub-display areas, and one sub-display area includes a display module 13i and a compensation sub-circuit 140i connected thereto.

[0045] In order to reduce the compensation of fluctuating power to zero, multiple compensation sub-circuits 140i are provided and dispersed in each small area (sub-display area) for compensation, thereby further reducing the fluctuation radiation range.

[0046] When there are multiple compensation circuits 14 , the control circuit 11 has two specific implementations.

[0047] In the first embodiment, the control circuit 11 is specifically configured to output a display signal and a display data compensation signal according to the video signal when receiving the video signal. The display data compensation signal carries multiple adjustment information. At this time, each compensation sub-circuit 140i is specifically configured to obtain corresponding adjustment information according to its own address, and compensate the power of the supply voltage according to the adjustment information.

[0048] In the second embodiment, the control circuit 11 is specifically configured to output a display signal and a plurality of display data compensation signals according to the video signal when receiving the video signal, and send each display data compensation signal to each corresponding compensation sub-circuit 140i. The plurality of display data compensation signals respectively carry a plurality of adjustment information. At this time, each compensation sub-circuit 140i is specifically configured to obtain corresponding adjustment information according to the corresponding display data compensation signal, and compensate the power of the supply voltage according to the adjustment information.

[0049] like Figure 3 As shown, the LED display circuit also includes a power supply 15.

[0050] The power supply 15 is connected to the compensation circuit 14 and the plurality of display modules 13i, and is configured to provide a power supply voltage.

[0051] Each display module 13i in the LED display circuit is powered by the power supply 15, which simplifies the circuit structure and reduces the cost.

[0052] like Figure 4 As shown, the compensation sub-circuit 140 i includes a digital-to-analog conversion component 141 and a load component 142 .

[0053] The digital-to-analog conversion component 141 is connected to the control circuit 11 and configured to convert the display data compensation signal into an analog adjustment signal;

[0054] The load component 142 is connected to the digital-to-analog conversion component 141 and is configured to compensate the power of the supply voltage according to the analog adjustment signal.

[0055] The display data compensation signal is converted into an analog adjustment signal through the digital-to-analog conversion component 141 and the load component 142, and the analog adjustment signal compensates the power of the power supply voltage. Since the analog adjustment signal is an analog signal, the accuracy of power compensation is improved.

[0056] Figure 5 A partial exemplary circuit structure of an LED display circuit provided by an embodiment of the present invention is shown. Figure 6 A partial exemplary circuit structure of a video codec circuit in an LED display circuit provided in an embodiment of the present invention is shown. For ease of description, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0057] The digital-to-analog conversion component 141 includes an analog-to-digital converter U1 and a first capacitor C1.

[0058] The power supply terminal VDD of the analog-to-digital converter U1 and the first end of the first capacitor C1 are commonly connected to the first power supply VAA, the analog reference voltage input terminal REF of the analog-to-digital converter U1 is connected to the second power supply VBB, the digital serial data input terminal DIN of the analog-to-digital converter U1 and the digital serial clock input terminal SCLK of the analog-to-digital converter U1 are connected to the display data compensation signal input terminal of the digital-to-analog conversion component 141, the analog voltage output terminal OUTA of the analog-to-digital converter U1 is connected to the analog adjustment signal output terminal of the digital-to-analog conversion component 141, and the first end of the first capacitor C1, the chip select terminal CS of the analog-to-digital converter U1 and the ground terminal GND of the analog-to-digital converter U1 are commonly connected to the power ground.

[0059] Specifically, the analog-to-digital converter U1 realizes the digital-to-analog conversion of the display data compensation signal to the analog adjustment signal, wherein the analog-to-digital converter U1 can adopt a voltage output device, such as TLV5618, so that the first transistor Q1 in the load component 142 can linearly adjust the compensation power and improve the accuracy of power compensation.

[0060] The load element 142 includes a first transistor Q1 , a first resistor R1 , and a second resistor R2 .

[0061] The first end of the first resistor R1 is connected to the analog adjustment signal input end of the load component 142, the second end of the first resistor R1 is connected to the base of the first transistor Q1, the emitter of the first transistor Q1 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is connected to the power supply 15, and the emitter of the first transistor Q1 is connected to the power ground.

[0062] The negative electrode component adopts a triode and a resistor, which can realize linear regulation of the compensation power, thereby improving the accuracy of power compensation.

[0063] The control circuit 11 includes a microprocessor U2.

[0064] The first data input / output terminal P1.0 of the microprocessor U2 and the second data input / output terminal P1.1 of the microprocessor U2 are connected to the display data compensation signal output terminal of the control circuit 11 .

[0065] The video codec module may include a first field programmable gate array U3; the first field programmable gate array U3 includes a plurality of groups of sub-display signal output terminals.

[0066] Each group of sub-display signal output terminals includes four pairs of differential output terminals of the first field programmable gate array U3.

[0067] The first group of sub-display signal output terminals may include the first general input and output terminal IO_L1P_T0_33 of the first field programmable gate array U3, the second general input and output terminal IO_L1N_T0_33 of the first field programmable gate array U3, the third general input and output terminal IO_L2P_T0_33 of the first field programmable gate array U3, the fourth general input and output terminal IO_L2N_T0_33 of the first field programmable gate array U3, the fifth general input and output terminal IO_L5P_T0_33 of the first field programmable gate array U3, the sixth general input and output terminal IO_L5N_T0_33 of the first field programmable gate array U3, the seventh general input and output terminal IO_L11P_T1_SRCC_33 of the first field programmable gate array U3, and the eighth general input and output terminal IO_L11N_T1_SRCC_33 of the first field programmable gate array U3.

[0068] At the same time, the first general input and output terminal IO_L1P_T0_33 of the first field programmable gate array U3, the second general input and output terminal IO_L1N_T0_33 of the first field programmable gate array U3, the third general input and output terminal IO_L2P_T0_33 of the first field programmable gate array U3 and the fourth general input and output terminal IO_L2N_T0_33 of the first field programmable gate array U3 are respectively connected to the first input terminal of the first ESD tube ESD1, the second input terminal of the first ESD tube ESD1, the third input terminal of the first ESD tube ESD1 and the fourth input terminal of the first ESD tube ESD1, and the fifth general input and output terminal IO_L1P_T0_33 of the first field programmable gate array U3 is connected to the first input terminal of the first ESD tube ESD1, the second input terminal of the first ESD tube ESD1, the third input terminal of the first ESD tube ESD1 and the fourth input terminal of the first ESD tube ESD1. 5P_T0_33, the sixth general input and output terminal IO_L5N_T0_33 of the first field programmable gate array U3, the seventh general input and output terminal IO_L11P_T1_SRCC_33 of the first field programmable gate array U3 and the eighth general input and output terminal IO_L11N_T1_SRCC_33 of the first field programmable gate array U3 are respectively connected to the first input terminal of the second ESD tube ESD2, the second input terminal of the second ESD tube ESD2, the third input terminal of the second ESD tube ESD2 and the fourth input terminal of the second ESD tube ESD2, and the ground terminal GND of the first ESD tube ESD1 and the ground terminal GND of the second ESD tube ESD2 are both connected to the power ground.

[0069] The first field programmable gate array is used to implement the video codec circuit 12, which significantly shortens the development cycle, reduces design risks, lowers costs, improves product reliability and flexibility, and achieves modularization and miniaturization.

[0070] The following is a combination of working principles Figure 5 and Figure 6 As shown for further explanation:

[0071] When receiving a video signal, the microprocessor U2 generates a display signal and a display data compensation signal according to the video signal, and outputs the display data compensation signal from the first data input / output terminal P1.0 of the microprocessor U2 and the second data input / output terminal P1.1 of the microprocessor U2.

[0072] The first field programmable gate array U3 generates a plurality of groups of sub-display signals according to the display signal, wherein each group of sub-display signals is output from four pairs of differential output terminals of the first field programmable gate array U3.

[0073] The multiple display modules 13i perform display according to the power supply voltage and the sub-display signal.

[0074] The digital serial data input terminal DIN of the analog-to-digital converter U1 and the digital serial clock input terminal SCLK of the analog-to-digital converter U1 receive the display data compensation signal, and output an analog adjustment signal from the analog voltage output terminal OUTA of the analog-to-digital converter U1 according to the display data compensation signal. The first transistor Q1 is turned on according to the analog adjustment signal, and the second resistor R2 consumes the power of the power supply voltage, thereby realizing compensation for the power of the power supply voltage, thereby avoiding large fluctuations in the power of the power supply voltage, that is, avoiding large fluctuations in current, and reducing electromagnetic radiation.

[0075] An embodiment of the present invention further provides an LED display screen, comprising the LED display circuit as described above.

[0076] The embodiment of the present invention outputs a display signal and a display data compensation signal according to the video signal when receiving a video signal through a control circuit; the video encoding and decoding circuit decodes the display signal into multiple groups of sub-display signals and outputs them; multiple display modules display according to the power supply voltage and the sub-display signals; the sub-display signals are input to the display modules one by one; the compensation circuit compensates the power of the power supply voltage according to the display data compensation signal; since the display data compensation signal is generated according to the video signal, and the compensation circuit compensates the power of the power supply voltage according to the display data compensation signal, the power fluctuation of the power supply voltage is reduced and the electromagnetic radiation is reduced.

[0077] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0078] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. An LED display circuit, characterized in that: include: a control circuit configured to output a display signal and a display data compensation signal according to the video signal when receiving the video signal; A video codec circuit, connected to the control circuit, configured to decode the display signal into multiple groups of sub-display signals and output them; A plurality of display modules are connected to the video codec circuit and configured to display according to the power supply voltage and the sub-display signal; the sub-display signal is input to the display module in a one-to-one correspondence; a compensation circuit, connected to the control circuit, configured to compensate the power of the supply voltage according to the display data compensation signal; The control circuit is specifically configured to obtain the video image information carried by the video signal, extract the color value of each pixel in the video image information, accumulate the color value of each pixel to obtain a power index, and calculate the average value of the power index within a preset time period before the current time to obtain a reference power index, and calculate the compensation power according to the reference power index and the power index, and generate the display data compensation signal according to the compensation power.

2. The LED display circuit according to claim 1, characterized in that: The compensation circuit includes a plurality of compensation sub-circuits, and the LED display circuit is provided with a plurality of sub-display areas, and one of the sub-display areas includes one of the display modules and one of the compensation sub-circuits connected thereto.

3. The LED display circuit according to claim 1, characterized in that: The LED display circuit also includes: A power supply is connected to the compensation circuit and the plurality of display modules and is configured to provide the power supply voltage.

4. The LED display circuit according to claim 2, characterized in that: The compensation subcircuit comprises: A digital-to-analog conversion component, connected to the control circuit, configured to convert the display data compensation signal into an analog adjustment signal; A load component is connected to the digital-to-analog conversion component and is configured to compensate the power of the supply voltage according to the analog adjustment signal.

5. The LED display circuit according to claim 4, characterized in that: The digital-to-analog conversion component includes an analog-to-digital converter and a first capacitor; The power supply terminal of the analog-to-digital converter and the first terminal of the first capacitor are commonly connected to the first power supply, the analog reference voltage input terminal of the analog-to-digital converter is connected to the second power supply, the digital serial data input terminal of the analog-to-digital converter and the digital serial clock input terminal of the analog-to-digital converter are connected to the display data compensation signal input terminal of the digital-to-analog conversion component, the analog voltage output terminal of the analog-to-digital converter is connected to the analog adjustment signal output terminal of the digital-to-analog conversion component, and the first terminal of the first capacitor, the chip select terminal of the analog-to-digital converter and the ground terminal of the analog-to-digital converter are commonly connected to the power ground.

6. The LED display circuit according to claim 4, characterized in that: The load component includes a first transistor, a first resistor and a second resistor; The first end of the first resistor is connected to the analog adjustment signal input end of the load component, the second end of the first resistor is connected to the base of the first transistor, the emitter of the first transistor is connected to the first end of the second resistor, the second end of the second resistor is connected to the power supply, and the emitter of the first transistor is connected to the power ground.

7. The LED display circuit according to claim 1, characterized in that: The control circuit includes a microprocessor; The first data input / output terminal of the microprocessor and the second data input / output terminal of the microprocessor are connected to the display data compensation signal output terminal of the control circuit.

8. An LED display screen, characterized in that: Comprising the LED display circuit as described in any one of claims 1 to 7.

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