CN113223443B - Multi-pixel LED driving chip and LED display screen - Google Patents
Multi-pixel LED driving chip and LED display screen Download PDFInfo
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- CN113223443B CN113223443B CN202010052600.8A CN202010052600A CN113223443B CN 113223443 B CN113223443 B CN 113223443B CN 202010052600 A CN202010052600 A CN 202010052600A CN 113223443 B CN113223443 B CN 113223443B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The invention discloses a multi-pixel LED driving chip and an LED display screen. The multi-pixel LED driving chip comprises a power supply unit, a data input unit, a data processing unit and an RGB driving circuit, wherein the data processing unit is respectively connected with the power supply unit and the data input unit; the power supply unit is used for addressing according to a circuit signal input by a power line after being electrified and then enters a power supply mode; the data input unit analyzes the data packet input by the data line to obtain a data analysis result and sends the data analysis result to the data processing unit; the data processing unit generates RGB control signals according to the data analysis result and inputs the RGB control signals into the RGB drive circuit to drive a plurality of groups of red, green and blue LED lamps so as to generate a gray scale effect, the function that the addressing mode and the power supply mode share one power line is realized, compared with the addressing mode in the prior art, one data line is saved, the wiring number of the LED display screen is greatly reduced, the product cost is reduced, and the product yield is improved.
Description
Technical Field
The invention relates to the technical field of LED display screens, in particular to a multi-pixel LED driving chip and an LED display screen.
Background
The LED display screen is composed of a plurality of pixel blocks, each pixel block is provided with a red, green and blue three-color LED lamp, and the driving of each pixel block mainly has two modes: passive addressing drive and active addressing drive. The passive address selection driving is a passive driving mode, also called scanning driving, and specifically, the scanning driving mode is used for driving the LED lamps in the pixel blocks of each line on the display screen line by line, which has the problems of complicated connection, serious low-gray-scale screen flashing and the like. The active addressing drive is provided with an active component for carrying out current drive on the LED, but the problems of poor uniformity, poor display, high power consumption, easy noise interference and the like still exist.
In view of the above, a solution is proposed by those skilled in the art that an LED driving chip is adopted on each pixel block, and data is transmitted to each LED driving chip by way of ROW/COLUMN addressing to perform LED driving. The types of LED driving chips include a single pixel LED driving chip and a multi-pixel LED driving chip. The single-pixel LED driving chip, namely each LED driving chip is connected with one red LED lamp, one green LED lamp and one blue LED lamp. The multi-pixel LED driving chip, namely each LED driving chip is connected with a plurality of groups of red LED lamps, green LED lamps and blue LED lamps. Besides the driving interface for each LED lamp, the chip is provided with two data line interfaces, namely an ROW interface (a ROW data input interface) and a COLUMN interface (a COLUMN data input interface). For the LED display screen applying the LED driving chip, the problem of more wiring is caused by too many interfaces, so that the production yield of products is limited, and the product cost is higher.
Disclosure of Invention
The invention aims to provide a multi-pixel LED driving chip and an LED display screen, which are used for reducing the number of wiring required by the LED display screen by reducing the number of interfaces of the multi-pixel LED driving chip, further reducing the line impedance, reducing the product cost and improving the product yield.
In order to solve the technical problem, the invention provides a multi-pixel LED driving chip, which comprises a power supply unit, a data input unit, a data processing unit connected with the power supply unit and the data input unit, and an RGB driving circuit connected with the data processing unit;
the power supply unit is used for being connected with a power line, addressing according to a circuit signal input by the power line after being electrified, and sending address information to the data processing unit; the data input unit is used for connecting a data line, analyzing a data packet input by the data line to obtain a data analysis result, and sending the data analysis result to the data processing unit; the data processing unit is used for generating RGB control signals according to the data analysis result and inputting the RGB control signals into the RGB drive circuit; the RGB driving circuit is respectively connected with the X red LED lamps, the X green LED lamps and the X blue LED lamps and is used for driving the red LED lamps, the green LED lamps and the blue LED lamps according to the RGB control signals so as to generate a gray scale effect;
x is a positive integer greater than 1.
Optionally, the mobile terminal further includes a scanning unit respectively connected to the power supply unit, the data input unit, and the data processing unit, and configured to generate a scanning signal according to the address information and the data analysis result, and send the scanning signal to the data processing unit;
correspondingly, the data processing unit generates RGB control signals according to the data analysis result, specifically:
the data processing unit determines a target LED channel according to the scanning signal and generates RGB control signals for the target LED channel according to the data analysis result;
wherein the target LED channel includes at least one of the red LED light, one of the green LED light, and one of the blue LED light.
Optionally, the data processing unit generates RGB control signals according to the data analysis result, specifically:
and the data processing unit generates RGB control signals for each red LED lamp, each green LED lamp and each blue LED lamp according to the data analysis result.
Optionally, after the power supply unit is powered on, the power supply unit addresses according to a circuit signal input by the power line, specifically:
and the power supply unit carries out addressing according to the voltage level input by the power line after being electrified.
Optionally, after the power supply unit is powered on, the power supply unit addresses according to a circuit signal input by the power line, specifically:
and the power supply unit carries out addressing according to the PWM signal input by the power line after being electrified.
Optionally, the data input unit analyzes the data packet input by the data line to obtain a data analysis result, specifically:
and the data input unit analyzes the data packet according to a data decoding rule corresponding to a preset data encoding rule to obtain a data signal and a clock signal.
Optionally, the data processing unit specifically includes a comparing unit and a control unit;
the comparison unit is used for comparing the address information input by the power supply unit with the address information obtained by analysis of the data input unit, and sending the data analysis result to the control unit when the comparison result is consistent;
the control unit is used for generating the RGB control signals according to the data analysis result and inputting the RGB control signals into the RGB drive circuit.
Optionally, the control unit specifically includes a current modulation circuit and a pulse width modulation circuit;
the current modulation circuit is used for generating a current modulation signal according to the data analysis result and inputting the current modulation signal into the RGB drive circuit; the pulse width modulation circuit is used for generating a pulse width modulation signal according to the data analysis result and inputting the pulse width modulation signal into the RGB drive circuit;
correspondingly, the RGB driving circuit specifically includes a current modulation signal receiving circuit connected to the red LED lamp, the green LED lamp, and the blue LED lamp and connected to the current modulation circuit, and a pulse width modulation signal receiving circuit connected to the pulse width modulation circuit.
Optionally, the current modulation signal specifically includes a first current modulation signal and a second current modulation signal, and the control unit is provided with a first current modulation signal output interface, a second current modulation signal output interface, and a pulse width modulation signal output interface;
correspondingly, the RGB drive circuit specifically comprises a first MOS tube, a second MOS tube and a third MOS tube;
the grid electrode of the first MOS tube is connected with the first current modulation signal output interface, the grid electrode of the second MOS tube is connected with the pulse width modulation signal output interface, the third MOS tube is connected with the second current modulation signal output interface, the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the drain electrode of the first MOS tube is connected with the drain electrode of the third MOS tube to form a first node, and the source electrode of the second MOS tube is connected with the source electrode of the third MOS tube to form a second node;
the first node is connected with an LED power supply, the second node is connected with the anode of the red LED lamp, the anode of the green LED lamp and the anode of the blue LED lamp, and the first MOS tube, the second MOS tube and the third MOS tube are all N-channel MOS tubes; or, the positive pole of red LED lamp, the positive pole of green LED lamp and the positive pole of blue LED lamp with the LED power is connected, first node with the power cord the negative pole of red LED lamp, the negative pole of green LED lamp and the negative pole of blue LED lamp are connected, second node ground connection, first MOS pipe the second MOS pipe with the third MOS pipe is P channel MOS pipe.
In order to solve the technical problem, the invention further provides an LED display screen, which is characterized by comprising any one of the multi-pixel LED driving chips, a substrate, a power supply unit, a display control unit, a red LED lamp, a green LED lamp and a blue LED lamp;
the display control unit comprises M data output interfaces, a power supply unit and a display control unit, wherein the power supply unit comprises N power output interfaces, and the display control unit comprises M data output interfaces;
the power supply unit is used for sending circuit signals to the multi-pixel LED driving chips through the power supply lines to address after the multi-pixel LED driving chips are powered on, and then supplying power to the multi-pixel LED driving chips through the power supply lines;
the display control unit is used for sending a data packet to each multi-pixel LED driving chip through a data line according to the address information of each multi-pixel LED driving chip;
the multi-pixel LED driving chip is respectively connected with the X red LED lamps, the X green LED lamps and the X blue LED lamps;
m and N are positive integers, and X is a positive integer greater than 1.
The invention provides a multi-pixel LED driving chip, which comprises a power supply unit, a data input unit, a data processing unit and an RGB driving circuit, wherein the data processing unit is respectively connected with the power supply unit and the data input unit; the power supply unit is used for being connected with a power line, addressing according to a circuit signal input by the power line after being electrified, and sending address information to the data processing unit; the data input unit is used for connecting a data line, analyzing a data packet input by the data line to obtain a data analysis result and sending the data analysis result to the data processing unit; the data processing unit is used for generating RGB control signals according to the data analysis result and inputting the RGB control signals into the RGB drive circuit so as to drive a plurality of groups of red, green and blue LED lamps to generate a gray scale effect. The power supply unit is used for addressing in the form of circuit signals, so that the function that the addressing mode and the power supply mode share one power line is realized, a data line is saved compared with a ROW/COLUMN addressing mode in the prior art, the wiring quantity of the LED display screen is further greatly reduced, the circuit impedance is reduced, the product cost is reduced, and the product yield is improved. The invention also provides an LED display screen, which has the beneficial effects and is not repeated herein.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a multi-pixel LED driving chip according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a pixel array formed by the multi-pixel LED driving chips shown in FIG. 1;
fig. 3 is a schematic diagram of a single channel driving according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another multi-pixel LED driving chip according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a multi-channel scan driver according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of voltage level addressing according to an embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating duty cycle addressing according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating an example of addressing a number of pulses;
FIG. 9 is a schematic diagram illustrating an embodiment of a data line addressing scheme;
fig. 10 is a schematic diagram of a data transmission method according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a pwm unit according to an embodiment of the present invention;
FIG. 12 is a schematic diagram of an operating waveform corresponding to the PWM unit shown in FIG. 11;
fig. 13 is a circuit diagram of an RGB driving circuit 104 according to an embodiment of the invention;
fig. 14 is a circuit diagram of another RGB driving circuit 104 according to an embodiment of the invention;
fig. 15 is a schematic structural diagram of an LED display screen according to an embodiment of the present invention.
Detailed Description
The core of the invention is to provide a multi-pixel LED driving chip and an LED display screen, which are used for reducing the number of wiring required by the LED display screen by reducing the number of interfaces of the multi-pixel LED driving chip, further reducing the line impedance, reducing the product cost and improving the product yield.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
Fig. 1 is a schematic structural diagram of a multi-pixel LED driving chip according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a pixel array composed of the multi-pixel LED driving chips provided in fig. 1.
As shown in fig. 1, the multi-pixel LED driving chip according to the embodiment of the present invention includes a power supply unit 101, a data input unit 102, a data processing unit 103 respectively connected to the power supply unit 101 and the data input unit 102, and an RGB driving circuit 104 connected to the data processing unit 103;
the power supply unit 101 is used for connecting a power line, addressing according to a circuit signal input by the power line after being powered on, and sending address information to the data processing unit 103; the data input unit 102 is used for connecting a data line, analyzing a data packet input by the data line to obtain a data analysis result, and sending the data analysis result to the data processing unit 103; the data processing unit 103 is configured to generate RGB control signals according to the data analysis result, and input the RGB control signals to the RGB driving circuit 104; the RGB drive circuit 104 is respectively connected with the X red LED lamps R, X green LED lamps G and the X blue LED lamps B and is used for driving the red LED lamps R, the green LED lamps G and the blue LED lamps B according to RGB control signals to generate a gray scale effect;
x is a positive integer greater than 1.
In a specific implementation, as shown in fig. 2, an LED display panel with resolution M × N × X has M × N × X pixel blocks corresponding to M × N multi-pixel LED driving chips shown in fig. 1, each multi-pixel LED driving chip corresponding to X pixel blocks. The N rows of multi-pixel LED driving chips correspond to N power lines (PWR 1-PWR N), namely one power line corresponds to one address information, namely Addr 1-Addr N, each power line is connected with M multi-pixel LED driving chips, and the address information of the multi-pixel LED driving chips connected on the same power line is the same.
The M rows of multi-pixel LED driving chips correspond to M data lines (data line 1-data line M), namely one data line is connected with N multi-pixel LED driving chips, and the address information of the multi-pixel LED driving chips is respectively Addr 1-Addr N.
The addressing rule (including the type of circuit signals, the corresponding relation between the circuit signals and address information and the like) of the LED display screen is preset, when the LED display screen system is powered on, the circuit signals are input through a power line to address each multi-pixel LED driving chip, and then the multi-pixel LED driving chip enters a working state.
Specifically, the operation mode of the power supply unit 101 includes an address mode and a power supply mode. When the LED display screen system is just powered on, the power supply unit 101 enters an addressing mode, addresses according to a circuit signal input by a connected power line, and after address information of the multi-pixel LED driving chip is obtained, the power supply unit 101 sends the address information to the data processing unit 103, and then enters a power supply mode.
The operation modes of the data input unit 102 include an address mode and a data mode. In the addressing mode, the data input unit 102 may be disabled (kept at a low level), or in the addressing mode with the power line enabling the data line, the corresponding address is sent out in cooperation with the power line to achieve the purpose of addressing. After addressing, the data input unit 102 enters a data mode, receives a data packet input by a data line, analyzes the data packet to obtain a data analysis result, and sends the data analysis result to the data processing unit 103. The data analysis result includes address information, display data and the like carried in the data packet.
The data processing unit 103 receives the address information sent by the power supply unit 101 and the data analysis result sent by the data input unit 102, determines that the address information in the data analysis result is correct according to the address information carried by the data packet and the address information of each multi-pixel LED driving chip, generates a corresponding RGB control signal according to the display data in the data analysis result, and inputs the RGB control signal to the RGB driving circuit 104.
The RGB driving circuit 104 generates driving signals for the red LED lamp R, the green LED lamp G, and the blue LED lamp B according to the RGB control signals, thereby generating a gray scale effect on a pixel block corresponding to the multi-pixel LED driving chip where the driving signals are located.
The multi-pixel LED driving chip provided by the embodiment of the invention comprises a power supply unit, a data input unit, a data processing unit and an RGB driving circuit, wherein the data processing unit is respectively connected with the power supply unit and the data input unit; the power supply unit is used for being connected with a power line, addressing according to a circuit signal input by the power line after being electrified, and sending address information to the data processing unit; the data input unit is used for connecting a data line, analyzing a data packet input by the data line to obtain a data analysis result and sending the data analysis result to the data processing unit; the data processing unit is used for generating RGB control signals according to the data analysis result and inputting the RGB control signals into the RGB drive circuit so as to drive a plurality of groups of red, green and blue LED lamps to generate a gray scale effect. The power supply unit is used for addressing in the form of circuit signals, so that the function that the addressing mode and the power supply mode share one power line is realized, a data line is saved compared with a ROW/COLUMN addressing mode in the prior art, the wiring quantity of the LED display screen is further greatly reduced, the circuit impedance is reduced, the product cost is reduced, and the product yield is improved.
Example two
Fig. 3 is a schematic diagram of a single channel driving according to an embodiment of the present invention; fig. 4 is a schematic structural diagram of another multi-pixel LED driving chip according to an embodiment of the present invention; fig. 5 is a schematic diagram of a multi-channel scan driving method according to an embodiment of the present invention.
The above-described embodiments provide a scheme for sharing a power line between an address mode and a power mode on a multi-pixel LED driving chip to reduce an interface. Unlike single-pixel LED driving chips, each multi-pixel LED driving chip connects multiple sets of red LED lamps R, green LED lamps G, and blue LED lamps B, thereby involving a problem of how to drive numerous LED lamps. In view of this, the embodiment of the present invention provides two specific implementations of driving multiple sets of red LED lamps R, green LED lamps G, and blue LED lamps B on a multi-pixel LED driving chip.
In order to ensure the display effect of the LED display screen, a preferred embodiment adopts a single-channel driving manner, that is, all the LED lamps are uniformly driven, and then the data processing unit 103 generates RGB control signals according to the data analysis result, specifically:
the data processing unit 103 generates RGB control signals for each red LED lamp R, each green LED lamp G, and each blue LED lamp B based on the data analysis result.
All the LED lamps are uniformly driven, the LED lamp driving interfaces on the multi-pixel LED driving chip need to correspond to the LED lamps one by one, and if the multi-pixel LED driving chip is connected with 16 groups of red LED lamps R, green LED lamps G and blue LED lamps B, 48 LED lamp driving interfaces are needed. As shown in fig. 3, the data packet received by the data input unit 102 includes display data for all the LED lamps connected to the multi-pixel LED driving chip, and the data analysis result for all the LED lamps is included in the single frame of data obtained by analysis. The data processing unit 103 generates RGB control signals for each red LED lamp R, each green LED lamp G, and each blue LED lamp B based on the data analysis result.
When the space is limited, a multi-channel scanning driving mode can be selected.
As shown in fig. 4, another multi-pixel LED driving chip according to an embodiment of the present invention further includes a scanning unit 401 connected to the power supply unit 101, the data input unit 102, and the data processing unit 103, and configured to generate a scanning signal according to the address information and the data parsing result, and send the scanning signal to the data processing unit 103;
correspondingly, the data processing unit 103 generates RGB control signals according to the data analysis result, specifically:
the data processing unit 103 determines a target LED channel according to the scanning signal and generates RGB control signals for the target LED channel according to the data analysis result;
wherein the target LED channel comprises at least one red LED lamp R, one green LED lamp G and one blue LED lamp B.
In a specific implementation, the data packet received by the data input unit 102 includes display data for an LED lamp of one channel connected to the multi-pixel LED driving chip, and the scanning unit 401 generates scanning signals (S1 to Sn) according to the address information and the data analysis result, and sequentially transmits the scanning signals to the data processing unit 103. The data processing unit 103 determines a current target LED channel according to the scanning signal, generates RGB control signals for each blue LED lamp B of the red LED lamp R and the green LED lamp G corresponding to the target LED channel according to the data analysis result, and then receives a next scanning signal. As shown in fig. 5, after the LED lamps of each LED channel are scanned once, one frame of data is formed.
Similarly, for example, the multi-pixel LED driving chip is connected with 16 groups of red LED lamps R, green LED lamps G and blue LED lamps B, and if 4 groups of red LED lamps R, green LED lamps G and blue LED lamps B correspond to one LED channel, 12 LED driving interfaces are required to be arranged, and 4 LED lamps multiplex one LED driving interface. Therefore, the multi-channel scan driving method can reduce the number of interfaces and thus reduce the required space, but has the disadvantage that the scan driving method has a poorer display effect than the single-channel driving method.
EXAMPLE III
FIG. 6 is a schematic diagram of voltage level addressing according to an embodiment of the present invention; FIG. 7 is a schematic diagram illustrating duty cycle addressing according to an embodiment of the present invention; FIG. 8 is a schematic diagram illustrating an example of addressing a number of pulses; fig. 9 is a schematic diagram illustrating an addressing of a data line according to an embodiment of the invention.
On the basis that a scheme for addressing each multi-pixel LED driving chip by a power line input circuit signal is provided, the embodiment of the invention further explains an addressing mode.
(1) After being powered on, the power supply unit 101 performs addressing according to a circuit signal input by a power line, which may specifically be:
the power supply unit 101 performs addressing according to the voltage level input by the power line after being powered on.
In an implementation, as shown in fig. 6, in the addressing mode, for each row of the multi-pixel LED driving chip, the power lines PWR1 to PWR N respectively input different voltage levels, and the power supply unit 101 of the multi-pixel LED driving chip may be, but not limited to, implemented by using an analog-to-digital converter or the like to detect the voltage levels, so as to obtain corresponding address information (Addr 1 to Addr N). Then, the power supply unit 101 enters a power supply mode, and the data input unit 102 enters a data mode.
(2) After being powered on, the power supply unit 101 performs addressing according to a circuit signal input by a power line, which may specifically be:
the power supply unit 101 addresses according to a PWM signal input from a power line after power-on.
In a specific implementation, as shown in fig. 7, for each row of the multi-pixel LED driving chips, different pulse modulation (PWM) signals are respectively input to the power lines PWR1 to PWR N, and the power supply unit 101 of the multi-pixel LED driving chip calculates a duty ratio to obtain corresponding address information (Addr 1 to Addr N). Then, the power supply unit 101 enters a power supply mode, and the data input unit 102 enters a data mode.
(3) After being powered on, the power supply unit 101 performs addressing according to a circuit signal input by a power line, which may specifically be:
the power supply unit 101 addresses according to the number of pulses input from the power line after power-up.
In a specific implementation, as shown in fig. 8, different pulse waves are input to the power supply lines PWR1 to PWR N of the multi-pixel LED driving chips in each row, and the power supply unit 101 of the multi-pixel LED driving chip calculates the number of pulses to obtain corresponding address information (Addr 1 to Addr N). Then, the power supply unit 101 enters a power supply mode, and the data input unit 102 enters a data mode.
(4) After being powered on, the power supply unit 101 performs addressing according to a circuit signal input by a power line, which may specifically be:
the power supply unit 101 addresses according to address information input from the data line after receiving a pulse enable signal input from the power line.
In a specific implementation, as shown in fig. 9, for each row of the multi-pixel LED driving chips, different pulse enable signals are respectively input to the power lines PWR1 to PWR N, addresses are synchronously input to the data lines in cooperation with the power lines, the power supply units 101 of different multi-pixel LED driving chips are started under different enable signals, and address information input by the data lines is received during starting, so that addressing is completed. Then, the power supply unit 101 enters a power supply mode, and the data input unit 102 enters a data mode.
It should be noted that, on the basis of the idea of the power line shared by addressing and power supply provided in the first embodiment of the present invention, in addition to the above four addressing modes, other addressing modes may also be provided, which all belong to the protection scope of the embodiment of the present invention.
Example four
Fig. 10 is a schematic diagram of a data transmission method according to an embodiment of the present invention.
In the multi-pixel LED driving chip solution provided in the first embodiment, each multi-pixel LED driving chip is connected to only one data line, and in order to implement data transmission, data information and clock information need to be transmitted on the data line at the same time. Therefore, the data input unit 102 analyzes the data packet input by the data line to obtain a data analysis result, which specifically includes:
the data input unit 102 parses the data packet to obtain a data signal and a clock signal according to a data decoding rule corresponding to a preset data encoding rule.
In a specific implementation, the data input unit 102 receives a data packet in a data mode, where the data packet includes data information and clock information.
The inclusion of clock information in the data packet may make the data a fixed period, as shown in fig. 10, so that the clock information is carried in the data information at the same time. After receiving the data packet, the data input unit 102 of the multi-pixel LED driving chip analyzes the data period to obtain the clock information.
A data coding rule and a corresponding data decoding rule of the LED display screen are preset, and for example, different data information is corresponding to the LED display screen in the modes of voltage level, duty ratio and the like. After receiving the data packet, the data input unit 102 of the multi-pixel LED driving chip converts the data information from a digital signal into a circuit signal according to a preset data decoding rule and sends the circuit signal to the data processing unit 103. Taking 2 bits as an example, as shown in fig. 10, if the duty ratio is adopted, 4 different duty ratios (e.g., 20%, 40%, 60%, 80%) need to be preset; if the voltage level is adopted, 4 different voltage levels (e.g. 1V, 2V, 3V, 4V) need to be preset.
By the above method, the data input unit 102 sends the clock information and the data information to the data processing unit 103 after analyzing the clock information and the data information.
EXAMPLE five
Fig. 11 is a schematic structural diagram of a pwm unit according to an embodiment of the present invention; FIG. 12 is a schematic diagram of an operating waveform corresponding to the PWM unit shown in FIG. 11; fig. 13 is a circuit diagram of an RGB driving circuit 104 according to an embodiment of the invention; fig. 14 is a circuit diagram of another RGB driving circuit 104 according to an embodiment of the invention.
In the above embodiment, it is mentioned that the data processing unit 103 compares the address information input by the power supply unit 101 with the address information analyzed by the data input unit 102, and processes the data information after the address information is consistent with the address information. Therefore, the data processing unit 103 specifically includes a comparison unit and a control unit. The comparing unit is used for comparing the address information input by the power supply unit 101 with the address information analyzed by the data input unit 102, and sending the data analysis result to the control unit when the comparison result is consistent. The control unit is configured to generate RGB control signals according to the data analysis result, and input the RGB control signals to the RGB driving circuit 104.
The LED display driving is current driving, and there are three alternative driving modes.
(1) Current drive is used. However, in this method, when low gray scale display is required, the equivalent current needs to be reduced, and the LED cannot be driven by low current, which causes a problem of color shift and uneven brightness.
(2) And PWM driving is adopted. And outputting different PWM waves by using a constant current and adopting a time cutting mode so as to output different equivalent currents. However, in the low gray scale display, the minimum width of the PWM is limited, which leads to the problem of low gray scale flashing of the LED display screen.
(3) And PWM and current hybrid driving is adopted. The gray scale is generated by PWM cutting time and the gray scale is generated by controlling the current magnitude, so that the best display effect is obtained, and the problem of screen flashing can not occur even when low-gray-scale display is performed.
Therefore, the preferable mode (3): PWM and current hybrid drive. Correspondingly, the control unit specifically comprises a current modulation circuit and a pulse width modulation circuit. The current modulation circuit is configured to generate a current modulation signal according to the data analysis result, and input the current modulation signal to the RGB driving circuit 104; the pulse width modulation circuit is used for generating a pulse width modulation signal according to the data analysis result and inputting the pulse width modulation signal into the RGB drive circuit 104; correspondingly, the RGB driving circuit 104 specifically includes a current modulation signal receiving circuit connected to the red LED lamp R, the green LED lamp G, and the blue LED lamp B and a pulse width modulation signal receiving circuit connected to the current modulation circuit.
The control unit can specifically adopt a digital circuit, so that compared with an analog circuit, the pulse width and the current of each gray scale can be provided more accurately, and the noise interference inside or outside the multi-pixel LED driving chip can be avoided. As shown in fig. 11, the pulse width modulation circuit specifically includes a counter, a comparator, and a DFF chip (D type flip-flop). As shown in fig. 12, the comparator compares the data analysis result with the counter data to obtain an accurate pulse width, and the DFF chip generates and outputs a pulse width signal.
The RGB driving circuit 104 is used to drive LED lamps and has two structures, i.e., common cathode and common anode. The RGB driving circuit 104 includes a current modulation signal receiving circuit and a pulse width modulation signal receiving circuit, and the cathode-common and anode-common structures are respectively shown in fig. 13 and fig. 14.
The control unit is provided with a first current modulation signal output interface, a second current modulation signal output interface and a pulse width modulation signal output interface;
correspondingly, the RGB driving circuit 104 specifically includes a first MOS transistor M1, a second MOS transistor M2, and a third MOS transistor M3;
the grid of the first MOS transistor M1 is connected to the first current modulation signal output interface, the grid of the second MOS transistor M2 is connected to the pulse width modulation signal output interface, the third MOS transistor M3 is connected to the second current modulation signal output interface, the source of the first MOS transistor M1 is connected to the drain of the second MOS transistor M2, the drain of the first MOS transistor M1 is connected to the drain of the third MOS transistor M3 as a first node, and the source of the second MOS transistor M2 is connected to the source of the third MOS transistor M3 and connected to a second node.
As shown in fig. 13, corresponding to the common anode structure, the first node is connected to the LED power supply, the second node is connected to the anode of the red LED lamp R, the anode of the green LED lamp G, and the anode of the blue LED lamp B, and the first MOS transistor M1, the second MOS transistor M2, and the third MOS transistor M3 all adopt N-channel MOS transistors.
Assuming that the first current modulation signal is I1, the second current modulation signal is I2, and the pulse width modulation signal is PWM, the driving current I of the RGB driving circuit provided in the embodiment of the present invention is expressed by the following equation:
the total pulse width may be 16 bits, that is, 65536 clock cycles.
As shown in fig. 14, corresponding to the common-cathode structure, the anode of the red LED lamp R, the anode of the green LED lamp G, and the anode of the blue LED lamp B are connected to the LED power supply, the first node is connected to the cathode of the power line red LED lamp R, the cathode of the green LED lamp G, and the cathode of the blue LED lamp B, the second node is grounded, and the first MOS transistor M1, the second MOS transistor M2, and the third MOS transistor M3 all adopt P-channel MOS transistors.
EXAMPLE six
Fig. 15 is a schematic structural diagram of an LED display screen according to an embodiment of the present invention.
On the basis of the above detailed description of various embodiments corresponding to the multi-pixel LED driving chip, the invention also discloses an LED display screen corresponding to the above method.
As shown in fig. 15, the LED display screen according to the embodiment of the present invention includes the multi-pixel LED driving chip (for short, "microchip") according to any one of the above embodiments, and further includes a substrate, a power supply unit, a display control unit, a red LED lamp R, a green LED lamp G, and a blue LED lamp B;
the display control unit comprises M data output interfaces;
the power supply unit is used for sending circuit signals to the multi-pixel LED driving chips through the power supply lines to address after the multi-pixel LED driving chips are electrified, and then supplying power to the multi-pixel LED driving chips through the power supply lines;
the display control unit is used for sending data packets to each multi-pixel LED driving chip through a data line according to the address information of each multi-pixel LED driving chip;
the multi-pixel LED driving chip is respectively connected with a red LED lamp R, a green LED lamp G and a blue LED lamp B;
m and N are both positive integers.
The LED display screen with the resolution ratio of M multiplied by N comprises a multi-pixel LED driving chip, a base material, a power supply unit, a display control unit, a red LED lamp R, a green LED lamp G and a blue LED lamp B. The multi-pixel LED driving chip, the power supply unit, the display control unit, the red LED lamp R, the green LED lamp G and the blue LED lamp B are all arranged on a base material (not shown in figure 12).
The power supply unit is connected to an external power supply for converting an input power supply into input power supplies for respective power supply lines (PWR 1-PWR N) for providing circuit signals and power supplies for addressing the respective multi-pixel LED driver chips.
The display control unit receives display data, converts the display data into data packets for each multi-pixel LED driving chip, and controls each data line (data line 1 to data line M) to transmit the data packets or control instructions to the data input unit 102 of the multi-pixel LED driving chip according to address information of each multi-pixel LED driving chip.
The multi-pixel LED driving chip receives the data packet sent by the display control unit and converts the digital data into current for driving each gray scale of the LED.
After the LED display screen is started, the display control unit and the power supply unit send out address information of the multi-pixel LED driving chips through the power supply line and the data line, after addressing (Addr 1-Addr N) of each multi-pixel LED driving chip on the data line 1-the data line M is finished, display data are also sent into each multi-pixel LED driving chip through the data line 1-the data line M, and the purpose of displaying is achieved.
The multi-pixel LED driving chip and the LED display panel provided by the present invention are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A multi-pixel LED driving chip is characterized by comprising a power supply unit, a data input unit, a data processing unit and an RGB driving circuit, wherein the data processing unit is respectively connected with the power supply unit and the data input unit;
the power supply unit is used for being connected with a power line, addressing according to a circuit signal input by the power line after being electrified, and sending address information to the data processing unit; the data input unit is used for connecting a data line, analyzing a data packet input by the data line to obtain a data analysis result, and sending the data analysis result to the data processing unit; the data processing unit is used for generating RGB control signals according to the data analysis result and inputting the RGB control signals into the RGB drive circuit; the RGB driving circuit is respectively connected with the X red LED lamps, the X green LED lamps and the X blue LED lamps and is used for driving the red LED lamps, the green LED lamps and the blue LED lamps according to the RGB control signals so as to generate a gray scale effect;
x is a positive integer greater than 1.
2. The multi-pixel LED driving chip according to claim 1, further comprising a scanning unit respectively connected to the power supply unit, the data input unit and the data processing unit, for generating a scanning signal according to the address information and the data parsing result, and sending the scanning signal to the data processing unit;
correspondingly, the data processing unit generates RGB control signals according to the data analysis result, specifically:
the data processing unit determines a target LED channel according to the scanning signal and generates RGB control signals for the target LED channel according to the data analysis result;
wherein the target LED channel includes at least one of the red LED light, one of the green LED light, and one of the blue LED light.
3. The multi-pixel LED driving chip of claim 1, wherein the data processing unit generates RGB control signals according to the data analysis result, specifically:
and the data processing unit generates RGB control signals for each red LED lamp, each green LED lamp and each blue LED lamp according to the data analysis result.
4. The multi-pixel LED driving chip of claim 1, wherein the power supply unit addresses according to a circuit signal input by the power line after being powered on, and specifically comprises:
and the power supply unit carries out addressing according to the voltage level input by the power line after being electrified.
5. The multi-pixel LED driving chip of claim 1, wherein the power supply unit is addressed according to a circuit signal inputted from the power line after being powered on, and specifically comprises:
and the power supply unit carries out addressing according to the PWM signal input by the power line after being electrified.
6. The multi-pixel LED driving chip according to claim 1, wherein the data input unit parses the data packet input by the data line to obtain a data parsing result, specifically:
and the data input unit analyzes the data packet according to a data decoding rule corresponding to a preset data encoding rule to obtain a data signal and a clock signal.
7. The multi-pixel LED driving chip according to claim 1, wherein the data processing unit specifically comprises a comparing unit and a control unit;
the comparison unit is used for comparing the address information input by the power supply unit with the address information obtained by analysis of the data input unit, and sending the data analysis result to the control unit when the comparison result is consistent;
the control unit is used for generating the RGB control signals according to the data analysis result and inputting the RGB control signals into the RGB drive circuit.
8. The multi-pixel LED driving chip according to claim 7, wherein the control unit specifically comprises a current modulation circuit and a pulse width modulation circuit;
the current modulation circuit is used for generating a current modulation signal according to the data analysis result and inputting the current modulation signal into the RGB drive circuit; the pulse width modulation circuit is used for generating a pulse width modulation signal according to the data analysis result and inputting the pulse width modulation signal into the RGB drive circuit;
correspondingly, the RGB driving circuit specifically includes a current modulation signal receiving circuit connected to the red LED lamp, the green LED lamp, and the blue LED lamp and connected to the current modulation circuit, and a pulse width modulation signal receiving circuit connected to the pulse width modulation circuit.
9. The multi-pixel LED driving chip according to claim 8, wherein the current modulation signal specifically includes a first current modulation signal and a second current modulation signal, and the control unit is provided with a first current modulation signal output interface, a second current modulation signal output interface, and a pulse width modulation signal output interface;
correspondingly, the RGB drive circuit specifically comprises a first MOS tube, a second MOS tube and a third MOS tube;
the grid electrode of the first MOS tube is connected with the first current modulation signal output interface, the grid electrode of the second MOS tube is connected with the pulse width modulation signal output interface, the third MOS tube is connected with the second current modulation signal output interface, the source electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the drain electrode of the first MOS tube is connected with the drain electrode of the third MOS tube to form a first node, and the source electrode of the second MOS tube is connected with the source electrode of the third MOS tube to form a second node;
the first node is connected with an LED power supply, the second node is connected with the anode of the red LED lamp, the anode of the green LED lamp and the anode of the blue LED lamp, and the first MOS tube, the second MOS tube and the third MOS tube are all N-channel MOS tubes; or, the positive pole of red LED lamp, the positive pole of green LED lamp and the positive pole of blue LED lamp with the LED power is connected, first node with the power cord the negative pole of red LED lamp, the negative pole of green LED lamp and the negative pole of blue LED lamp are connected, second node ground connection, first MOS pipe the second MOS pipe with the third MOS pipe is P channel MOS pipe.
10. An LED display screen, characterized by comprising the multi-pixel LED driving chip of any one of claims 1 to 9, further comprising a substrate, a power supply unit, a display control unit, a red LED lamp, a green LED lamp and a blue LED lamp;
the display control unit comprises M data output interfaces, a power supply unit and a display control unit, wherein the power supply unit comprises N power output interfaces, and the display control unit comprises M data output interfaces;
the power supply unit is used for sending circuit signals to the multi-pixel LED driving chips through the power supply lines to address after the multi-pixel LED driving chips are powered on, and then supplying power to the multi-pixel LED driving chips through the power supply lines;
the display control unit is used for sending a data packet to each multi-pixel LED driving chip through a data line according to the address information of each multi-pixel LED driving chip;
the multi-pixel LED driving chip is respectively connected with the X red LED lamps, the X green LED lamps and the X blue LED lamps;
m and N are positive integers, and X is a positive integer greater than 1.
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| CN114446191A (en) * | 2022-02-15 | 2022-05-06 | 珠海华萃科技有限公司 | Novel LED display module and display screen |
| WO2023225810A1 (en) * | 2022-05-23 | 2023-11-30 | 京东方科技集团股份有限公司 | Pixel unit, display substrate and driving method therefor, and display device |
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