CN117392944A - Display screen driving circuit, method and device - Google Patents
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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]
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
Abstract
The application relates to a display screen driving circuit, a display screen driving method and a display screen driving device. The display screen driving circuit includes: the display screen driving circuit comprises a decoding storage module and a display driving module, wherein the decoding storage module is connected with the display driving module, and the display screen driving circuit comprises a decoding storage module and a display driving module, wherein: the decoding memory module comprises a first input end and a second input end, wherein the first input end is used for receiving a data signal, the second input end is used for receiving a clock signal, and the decoding memory module is used for: reading a data signal based on the clock signal; if the data signal accords with the target data type, storing the read data signal as display data; the display driving module is connected with at least one LED lamp and comprises a third input end, the third input end is used for synchronously acquiring clock signals, and the display driving module is used for acquiring display data; and constant current driving is carried out on the LED lamp corresponding to the display data based on the clock signal and the display data. The method can reduce the signal wire harness and improve the port utilization rate.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display driving circuit, a display driving method, and a display driving device.
Background
With the development of gray scale modulation technology, in order to enhance the display effect, people often use a high-frequency display clock to control the gray scale display of the LED.
Fig. 1 shows an LED display device in the conventional technology, which includes a control end and a plurality of LED modules connected in series in sequence, wherein each LED module includes a plurality of driving circuits connected in series. The control terminal provides the DATA signal DATA, the shift clock signal SCLK and the display clock signal GCLK to each LED module. As shown in fig. 2, when display data needs to be transmitted, a shift clock signal and a data signal are input to a shift register group through a Sclk port and a Din port respectively, and the shift register group needs to analyze the data signal through the shift clock signal to store the display data; in order to realize high-frequency display, the control end sends a high-frequency and continuous display clock signal to the driving circuit through the Gclk port, and the display control module drives and displays display data based on the display clock signal.
Therefore, in the existing display device, two clock signals, namely a shift clock signal and a display clock signal, are required to be transmitted to the driving circuit through two clock lines, so that more signal lines are caused, the connection relationship is complex, and more serious port resource waste exists.
Based on the above, the existing display screen system still has the problems of more signal wire harnesses and low port utilization rate.
Disclosure of Invention
Accordingly, it is desirable to provide a display driving circuit, method and apparatus that can reduce the number of signal harnesses and improve the port utilization.
In a first aspect, the present embodiment provides a display screen driving circuit, including a decoding storage module and a display driving module, the decoding storage module being connected to the display driving module, wherein:
the decoding memory module comprises a first input end and a second input end, wherein the first input end is used for receiving a data signal, the second input end is used for receiving a clock signal, and the decoding memory module is used for: reading a data signal based on the clock signal; if the data signal accords with the target data type, storing the read data signal as display data;
the display driving module is connected with at least one LED lamp and comprises a third input end, wherein the third input end is used for synchronously acquiring the clock signal, and the display driving module is used for acquiring the display data; and performing constant current driving on the LED lamp corresponding to the display data based on the clock signal and the display data.
In one embodiment, the decoding storage module further includes a first output end, where the first output end is connected to a first input end of a next display screen driving circuit, and is configured to send the data signal to the next display screen driving circuit.
In one embodiment, the decoding storage module comprises a registering module, a judging module and a storage module which are sequentially connected; the storage module is also connected with the display driving module, wherein:
the register module comprises a first input end and a second input end, wherein the first input end is used for receiving a data signal, the second input end is used for receiving a clock signal, and the register module is used for reading the data signal based on the clock signal;
the judging module is used for acquiring the data signal and judging whether the data signal accords with a target data type or not; if the data signal accords with the target data type, the data signal is sent to the storage module;
the storage module is used for storing the data signals as display data.
In one embodiment, the judging module is further configured to:
judging whether the data signal is an idle state code or not based on the data signal;
if not, the data signal accords with the target data type; if yes, the data signal does not conform to the target data type.
In one embodiment, the display driving module comprises a display control module and a constant current driving module, wherein the display control module is connected with the constant current driving module, and the display control module is also connected with the decoding storage module; the constant current driving module is connected with at least one LED lamp;
the display control module comprises a third input end, wherein the third input end is used for synchronously acquiring the clock signal, and the display control module is used for acquiring the display data and sending a control signal to the constant current driving module based on the clock signal and the display data;
and the constant current driving module is used for performing constant current driving on the LED lamp corresponding to the display data based on the control signal.
In a second aspect, the present embodiment provides a display driving method, which is applied to the above display driving circuit, and the display driving method includes:
reading a data signal based on the clock signal;
if the data signal accords with the target data type, storing the read data signal as display data;
and performing constant current driving on the LED lamp corresponding to the display data based on the clock signal and the display data.
In one embodiment, the reading the data signal based on the clock signal includes:
and sending the data signal to the next display screen driving circuit.
In one embodiment, if the data signal meets the target data type, before storing the read data signal as display data, the method includes:
judging whether the data signal is an idle state code or not based on the data signal;
if not, the data signal accords with the target data type; if yes, the data signal does not conform to the target data type.
In a third aspect, the present embodiment provides a display driving apparatus comprising a control terminal and at least one display driving circuit as described above,
the control end comprises a data signal output end and a clock signal output end, is connected with a first input end of the first display screen driving circuit through the data signal output end respectively, is connected with a second input end of the display screen driving circuit through the clock signal output end and is used for sending data signals and clock signals to the display screen driving circuit through the data signal output end and the clock signal output end respectively;
the display screen driving circuit is used for: reading a data signal based on the clock signal; if the data signal accords with the target data type, storing the read data signal as display data; and performing constant current driving on the LED lamp corresponding to the display data based on the clock signal and the display data.
In one embodiment, when the display screen driving circuits are at least two,
the display screen driving circuit further comprises a first output end, and at least two display screen driving circuits are sequentially connected in series through the first output end and the first input end.
According to the display screen driving circuit, the display screen driving method and the display screen driving device, the decoding storage module is used for reading the data signals based on the clock signals and storing the read data signals as the display data under the condition that the data signals accord with the target data types, the display driving module is used for obtaining the stored display data and performing constant current driving on the LED lamps corresponding to the display data based on the clock signals and the display data, so that the transmission, driving and displaying of the display data can be realized by only one data signal line and one clock signal, the number of the signal wire harnesses is reduced, the higher efficiency utilization can be realized under the condition that the number of the ports is reduced, and the technical effects of reducing the signal wire harnesses and improving the port utilization rate are achieved.
Drawings
FIG. 1 is a block diagram of a conventional display driving system;
FIG. 2 is a block diagram showing a conventional display driving circuit;
FIG. 3 is a block diagram of a display screen driving circuit in one embodiment;
FIG. 4 is a block diagram of a display driving circuit according to another embodiment;
FIG. 5 is a flow chart of a method of driving a display screen according to an embodiment;
FIG. 6 is a block diagram of a display driving apparatus in one embodiment;
fig. 7 is a block diagram of a display driving apparatus according to another embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
FIG. 1 is a block diagram showing a conventional display driving system; fig. 2 is a block diagram showing a structure of a display driving circuit in the conventional art.
In one embodiment, as shown in fig. 3, there is provided a display screen driving circuit, the display screen driving circuit including a decoding storage module 1 and a display driving module 2, the decoding storage module 1 being connected with the display driving module 2, wherein:
the decoding memory module 1 comprises a first input 101 and a second input 102, the first input 101 being arranged to receive a data signal and the second input 102 being arranged to receive a clock signal, the decoding memory module 1 being arranged to: reading a data signal based on the clock signal; if the data signal accords with the target data type, storing the read data signal as display data;
the display driving module 2 is connected with at least one LED lamp, the display driving module 2 includes a third input end 201, the third input end 201 is used for synchronously acquiring the clock signal, and the display driving module 2 is used for acquiring the display data; and performing constant current driving on the LED lamp corresponding to the display data based on the clock signal and the display data.
The decoding storage module 1 is connected with the display driving module 2, and the display driving module 2 is connected with at least one LED lamp. The decoding and storing module 1 is used for receiving the data signal and the clock signal and storing display data in the data signal. The data signal may further include data such as parameter information and instruction information, which is not limited in this embodiment. The clock signal is used for reading the data signal and providing the data signal to the display driving module 2 for driving display.
The first input 101 of the decoding memory module 1 is arranged to receive a data signal and the second input 102 is arranged to receive a clock signal, the transmission of the data signal and the clock signal may be continuous. It will be appreciated that the clock signal may be a continuous signal comprising a plurality of high-level phases and low-level phases, and the decoding and storing module 1 may take the changing edge of the clock signal as a trigger signal to read and store the data in the data signal one by one.
The display driving circuit in this embodiment may have only one clock input terminal, to which the second input terminal 102 and the third input terminal 201 are connected in parallel, and simultaneously receive the clock signal input from the clock input terminal. Accordingly, the decoding memory module 1 and the display driving module 2 may be connected in parallel to the clock input terminal through the second input terminal 102 and the third input terminal 201, respectively, to simultaneously receive the clock signal. The display driving module 2 may acquire the display data stored in the decoding storage module 1, and perform constant current driving on the corresponding LED lamp in the display data based on the changing edge of the clock signal as a trigger signal. The constant current driving of the LED lamp can be realized by starting a driving output end corresponding to the LED lamp to be started in the constant current driving unit.
According to the display screen driving circuit provided by the embodiment, the data signals are read based on the clock signals by the decoding storage module 1, the read data signals are stored as display data under the condition that the data signals accord with the target data types, the display driving module 2 obtains the stored display data, and constant-current driving is carried out on the LED lamps corresponding to the display data based on the clock signals and the display data, so that transmission and driving display of the display data can be realized by only one data signal wire and one clock signal, the number of wire harnesses of the signals is reduced, higher efficiency utilization can be realized under the condition that the number of ports is less, and the technical effects of reducing the number of the signal wires and improving the port utilization rate are achieved.
In one embodiment, the decoding storage module further includes a first output end, where the first output end is connected to a first input end of a next display screen driving circuit, and is configured to send the data signal to the next display screen driving circuit.
It will be appreciated that the display driver circuit may also be connected to other display driver circuits. In one embodiment, a plurality of display screen driving circuits form a driving circuit group, each display screen driving circuit is connected with the control end through the first input end and the first output end respectively, one display screen driving circuit is connected with the control end through the first input end and is used for receiving data signals from the control end, and after the display data corresponding to the display screen driving circuit are read, the rest data signals are sequentially transmitted to the next display screen driving circuit.
According to the display screen driving circuit provided by the embodiment, the control end is connected with the plurality of display screen driving circuits through the first input end and the first output end respectively, so that data signal transmission under the condition that the plurality of display screen driving circuits exist can be realized.
In one embodiment, the decoding storage module comprises a registering module, a judging module and a storage module which are sequentially connected; the storage module is also connected with the display driving module, wherein:
the register module comprises a first input end and a second input end, wherein the first input end is used for receiving a data signal, the second input end is used for receiving a clock signal, and the register module is used for reading the data signal based on the clock signal;
the judging module is used for acquiring the data signal and judging whether the data signal accords with a target data type or not; if the data signal accords with the target data type, the data signal is sent to the storage module;
the storage module is used for storing the data signals as display data.
The register module, the judging module and the storage module are sequentially connected. The first and second inputs of the decode memory module may be the first and second inputs of the register module. Further, when the display screen driving circuit and other display screen driving circuits form a sequence in the same environment, the register module may further include a first output end, and the plurality of display screen driving circuits are sequentially connected through the first input end and the first output end.
The first input end of the register module is used for receiving the data signal, the second input end is used for receiving the clock signal, and the contents of the data signal can be sequentially read and registered based on the change edge of the clock signal as a trigger signal.
The judging module is used for acquiring the data signals in the registering module and judging whether the data signals accord with the target data types. To ensure accurate determination of the target data type, the data signal in the capture register module should be taken after the data signal is shifted into place. It can be understood that the judging module can judge whether the data signal accords with the target data type, which can be comparing and judging the data in the register module with the preset data or judging according to the specific data bit in the data. Taking 16-bit binary data stored in the register module as an example, the data in the register module and the preset data are compared and judged, the 16-bit data can be compared one by one, and if the stored data are completely consistent with the preset data, the data signal can be judged to conform to the target data type or the possibility that the data signal is the target data type can be eliminated. The judgment is performed according to specific data bits in the data, taking 16-bit display data stored in the register module and taking the numerical values of the 0 th bit, the 4 th bit and the 8 th bit as the judgment basis of the specific data bits as an example, when the acquired data signals are 1000100010000000, 1001100110101000 and the like, the specific data bits simultaneously accord with the preset numerical value to be 1, and then the data signals can be judged to accord with the target data type or the possibility of excluding the data signals as the target data type can be judged.
Further, the display data may include gray-scale data, and the gray-scale data may be any of 8 bits, 10 bits, 12 bits, 16 bits, and other available bits for display. It will be appreciated that the number of gray scale data bits may be divided into a plurality of gray scales, for example, 10bit gray scale data may be divided into 2 10 I.e. 1024 grey levels. The data signal of the present embodiment may be a code representing a partial gray scale, instead of parameter information or instruction information, and in the case where the gray scale is sufficiently large, since the single or partial gray scale code is less recognizable to the naked eye, the influence on the image quality is also within a controllable allowable range.
The storage module is used for storing the data signals as display data. It can be understood that if the data signal is the target data type, the display data can be regarded as updated, and the display data in the storage module needs to be updated and stored, so that the LED lamp driven by the current driving circuit can be displayed based on the updated display data.
According to the display screen driving circuit provided by the embodiment, the register module is used for carrying out shift register on the data signals based on the clock signals, after the data signals are shifted to the right, the judging module is used for judging whether the data signals are of the target data type or not based on the data signals in the register module and sending the data signals to the storage module for storage under the condition that the data signals are of the target data type, so that the judgment of the target data type on the data signals can be realized, and when the data signals are not of the target data signals, display data in the storage module can be reserved for continuous display, and the stability of the output image quality of the display screen driving circuit is improved.
In one embodiment, the judging module is further configured to:
judging whether the data signal is an idle state code or not based on the data signal;
if not, the data signal accords with the target data type; if yes, the data signal does not conform to the target data type.
Wherein the idle state code may be used to indicate that no display data is present in the data signal. It can be understood that when the display screen driving circuit is connected with other display screen driving circuits, in order to reduce the number of data output ports of the control end, the plurality of display screen driving circuits are sequentially connected in series, and the control end only needs one data signal line to send a data signal, and the data signal is transmitted in the display screen driving circuit step by step.
Through the arrangement of the idle state code, the judging module can judge whether the display data in the storage module need to be updated after the data signal is shifted in place, if the current data signal is the idle state code, the data signal is not in accordance with the target data type, and the display data does not need to be updated; if the current data signal is not the idle state code, the representative data signal accords with the target data type, and the display data needs to be updated.
According to the display screen driving circuit provided by the embodiment, after the data signal is shifted in place through the arrangement of the idle state code, the judging module judges whether the data signal content accords with the target data type or not based on the data signal content, and further whether the content is stored as display data or not is determined.
In one embodiment, the display driving module comprises a display control module and a constant current driving module, wherein the display control module is connected with the constant current driving module, and the display control module is also connected with the decoding storage module; the constant current driving module is connected with at least one LED lamp;
the display control module comprises a third input end, wherein the third input end is used for synchronously acquiring the clock signal, and the display control module is used for acquiring the display data and sending a control signal to the constant current driving module based on the clock signal and the display data;
and the constant current driving module is used for performing constant current driving on the LED lamp corresponding to the display data based on the control signal.
The display driving module comprises a display control module and a constant current driving module, and the third input end of the display driving module can be the third input end of the display control module. The display control module may acquire the display data stored in the decoding storage module, and perform constant current driving control one by one according to the display data by using a conversion edge of the clock signal as a trigger signal. The control of the constant current driving may be to send a control signal to the constant current driving module, so that the constant current driving module performs constant current driving on the corresponding LED lamp according to the control signal.
The display control module may read the display data, and control the display driving of the constant current driving module through the clock signal received by the third input terminal. For example, when the clock signal is an aperiodic clock signal modulated in advance according to display control information, the aperiodic clock signal may also be directly used for control of constant current driving. Illustratively, the received clock signal may also be modulated to generate a control signal to control the constant current drive; or a crystal oscillator with preset frequency is arranged in the crystal oscillator, and a signal generated by the crystal oscillator is modulated to generate a control signal; other control signal generation methods based on the processing by the external clock signal or the internal signal generation unit are also possible, and this embodiment is not limited thereto.
According to the display screen driving circuit provided by the embodiment, the display control module generates the control signal based on the clock signal and the display data so as to drive the constant current driving module to drive and display the LED lamp corresponding to the display data, so that a constant current driving scheme under the same clock signal can be realized.
In order to more clearly illustrate the technical solution of the present application, the present application also provides a detailed embodiment. As shown in fig. 4, in the present embodiment, there is provided a display screen driving circuit including: a shift register group 110, a judging module 120, a storage module 130, a display control module 210, and a constant current driving module 220.
The first input end of the embodiment is a data input end Din, and the second input end and the third input end are clock input ends Clk; the shift register group 110 obtains a data signal through a data input terminal Din, and transmits the signal to a next display screen driving circuit through a first output terminal, namely a data output terminal Dout; the shift register group 110 and the display control module 210 both acquire clock signals through a clock input terminal Clk; the constant current driving module 220 includes a plurality of driving output terminals Out, and provides a pull-down constant current to the corresponding LED lamp through the driving output terminals Out. In this embodiment, the display screen driving circuit may be connected to the control end or the previous display screen driving circuit through the data input end Din, connected to the control end through the clock input end, and respectively receiving the data signal and the clock signal sent by the control end or the previous display screen driving circuit.
The clock signal CLK is a continuous pulse signal including a plurality of high-level stages and low-level stages for controlling data shift and gray scale display in the driving circuit. Taking a common positive driving mode as an example, a plurality of driving output ends Out of the driving circuit are respectively connected with cathodes of a plurality of LED lamps, and meanwhile, anode ends of the LED lamps are connected with a power supply VDD; when the driving output terminal Out provides a pull-down constant current, the corresponding LED lamp is lighted.
The shift register group 110 receives a clock signal of a control terminal through a clock input terminal Clk, receives a data signal transferred from the control terminal or a previous stage driving circuit through a data input terminal Din, controls the data signal to shift in each register according to the clock signal, and transfers the data signal to a next stage driving circuit through a data output terminal Dout.
The judging module 120 is communicatively connected to the shift register set 110 and the storage module 130, and after the data signal is shifted into place, the judging module 120 obtains corresponding data from the shift register set 110, judges whether the data is idle state information, enters a communication idle state if the data is idle state information, does not perform data storage operation, determines that the data is display data or configuration parameter data of the driving circuit of the current stage if the data is not idle state information, and stores the data into the storage module 130.
The display control module 210 is in communication connection with the storage module 130 and the constant current driving module 220, receives a clock signal sent by the control end through the clock input end Clk, and the constant current driving module 220 is connected with a plurality of LED lamps through driving output ends Out; and then the display control module 210 controls the constant current driving module 220 to provide a pull-down constant current at the corresponding driving output end Out according to the gray scale data stored in the storage module 130 under the control of the clock signal, so as to control the corresponding LED lamp to display or turn off for a corresponding effective duration.
The idle state information in this embodiment may be an idle state code, taking 16bit display data as an example, and the idle state information may be all-zero encoded, that is, the received data is data with 16 bits all being 0, in this case, if the received data is all-zero encoded, it represents that the display data does not need to be updated, and it is determined that the communication idle state is currently entered, and it is not necessary to perform a storage operation; if the received data is non-all-zero coding, the received data is representing display data, and the communication idle state is ended, and the display data is stored and driven for display.
After the display data is sent, the drive circuit is informed to enter the idle period through a specific instruction or code by defining a communication idle state, and before the new round of display data forwarding starts, the drive circuit is informed to end the current idle state through the specific instruction or code, and the display data is about to be sent; the data line is used for informing the driving circuit of the content, and the driving circuit is not required to be informed of whether the display data is shifted currently or not by the shift clock line, namely, the shift clock signal is not required to be provided with an invalid period, so that the shift clock can be continuous, and the data shifting and the display in the driving circuit can share the same clock signal.
It is understood that, besides all-zero coding, specific coding can be determined based on actual requirements, and the coding of the idle state information can be set. Other specific codes may be determined, and the corresponding gray scale may be replaced, so that instruction information or parameter information indicating the requirement is not limited herein.
According to the display screen driving circuit, transmission and driving display of display data are achieved through only one data signal line and one clock signal, so that the number of signal wire harnesses is reduced, higher-efficiency utilization can be achieved under the condition of fewer ports, and the technical effects of reducing the signal wire harnesses and improving the port utilization rate are achieved; the control end is connected with the plurality of display screen driving circuits through the data input end and the data output end respectively, so that data signal transmission can be realized under the condition that the plurality of display screen driving circuits exist; the register module is used for carrying out shift register on the data signals based on the clock signals, the judging module is used for judging whether the data signals are of a target data type or not based on the data signals in the register module, and sending the data signals to the storage module for storage under the condition that the data signals are of the target data type, so that the judgment of the target data type of the data signals can be realized, and when the data signals are not of the target data signals, display data in the storage module can be reserved for continuous display, and the stability of the output image quality of the display screen driving circuit is improved; the display control module generates a control signal based on the clock signal and the display data to drive the constant current driving module to drive and display the LED lamp corresponding to the display data, so that a constant current driving scheme under the same clock signal can be realized.
Based on the same inventive concept, the embodiment of the application also provides a display screen driving method applied to the display screen driving circuit. The implementation of the solution to the problem provided by the method is similar to that described in the above circuit, so the specific limitation of one or more embodiments of the display driving method provided below may be referred to the limitation of the display driving circuit hereinabove, and will not be repeated herein.
In one embodiment, as shown in fig. 5, a display driving method is provided and applied to the display driving circuit, where the display driving method includes:
step S100, reading a data signal based on the clock signal.
Step S200, if the data signal meets the target data type, storing the read data signal as display data.
And step S300, performing constant current driving on the LED lamp corresponding to the display data based on the clock signal and the display data.
In one embodiment, the reading the data signal based on the clock signal includes:
and sending the data signal to the next display screen driving circuit.
In one embodiment, if the data signal meets the target data type, before storing the read data signal as display data, the method includes:
judging whether the data signal is an idle state code or not based on the data signal;
if not, the data signal accords with the target data type; if yes, the data signal does not conform to the target data type.
It can be understood that, in the conventional LED driving method, the main reason that the shift clock and the display clock must be transmitted separately is that the control terminal needs to set the clock disable period in the shift clock to inform the driving circuit that no display data is transmitted at this time. Therefore, in the driving method proposed in this embodiment, after the control end finishes sending the display data, a specific instruction or code is loaded in the data signal line to prompt the shift register set to not transmit the display data afterwards. The method includes defining a communication idle state, and transmitting idle state information represented by a preset instruction or code through a data signal line after the control end displays data transmission, namely, the data signal line displays data shifting completion and stores the data shifting completion and the data shifting completion in a storage module; and then the driving circuit analyzes the corresponding instruction or code and enters a communication idle state. Optionally, in the current idle state, if a new round of display data transmission is to be performed, the idle state may be finished, and the display data to be entered into the new round may be shifted and stored by a preset instruction or code before the display data is transmitted.
After the display data is sent, the drive circuit is informed to enter the idle period through a specific instruction or code by defining a communication idle state, and before the new round of display data forwarding starts, the drive circuit is informed to end the current idle state through the specific instruction or code, and the display data is about to be sent; the data line is used for informing the driving circuit of the content, and the driving circuit is not required to be informed of whether the display data is shifted currently or not by the shift clock line, namely, the shift clock signal is not required to be provided with an invalid period, so that the shift clock can be continuous, and the data shifting and the display in the driving circuit can share the same clock signal.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a display screen driving device applying the display screen driving circuit. The implementation of the solution provided by the device is similar to that described in the above circuit, so specific limitations in one or more embodiments of the display driving device provided below may be referred to above for limitations of the display driving circuit, and will not be described herein.
In one embodiment, as shown in fig. 6, the present embodiment provides a display driving apparatus, which includes a control terminal 300 and at least one display driving circuit 400 as described above,
the control end 300 comprises a data signal output end and a clock signal output end, and is respectively connected with a first input end of the first display screen driving circuit 400 through the data signal output end, and is connected with a second input end of the display screen driving circuit 400 through the clock signal output end, and the control end 300 is used for respectively transmitting a data signal and a clock signal to the display screen driving circuit 400 through the data signal output end and the clock signal output end;
the display driving circuit 400 is configured to: reading a data signal based on the clock signal; if the data signal accords with the target data type, storing the read data signal as display data; and performing constant current driving on the LED lamp corresponding to the display data based on the clock signal and the display data.
In one embodiment, when the display driving circuit 400 is at least two,
the display screen driving circuit 400 further includes a first output end, and at least two display screen driving circuits 400 are sequentially connected in series through the first output end and the first input end.
In a specific embodiment, as shown in fig. 7, the display driving device includes a control end 300 and a plurality of display driving circuits 400, where the plurality of display driving circuits 400 are sequentially connected in series, and each display driving circuit 400 is connected with a plurality of LED lamps, where:
the control end 300 is provided with a data transmitting end and a clock transmitting end; the display driving circuit 400 is provided with a data input terminal Din, a data output terminal Dout, a clock input terminal Clk, and a plurality of driving output terminals Out. Further, the plurality of display driving circuits 400 may be divided into a plurality of LED modules, for example, the plurality of LED modules are serially connected in sequence, and each module includes a plurality of display driving circuits 400 serially connected in sequence.
The data output end Dout of each display screen driving circuit 400 is sequentially connected with the data input end Din of the subsequent display screen driving circuit 400, and the data input end Din of the first display screen driving circuit 400 is connected with the data transmitting end of the control end 300, so that a serial signal path is formed among a plurality of display screen driving circuits 400; the control terminal 300 serially transmits the DATA signal DATA to each of the panel driving circuits 400 through the serial signal path. The DATA signal DATA is used for transmitting display DATA or configuration parameter DATA representing pixels; the display DATA is loaded in the DATA signal DATA and is transmitted one by one through the driving circuits connected in series. In the case where the plurality of display screen driving circuits 400 are divided into LED modules, the display data may be sequentially transferred through the LED modules connected in series, and the display data may be transferred from the driving circuit to the driving circuit inside each module.
The clock input Clk of each display driving circuit 400 is directly connected to the clock transmitting terminal of the control terminal 300, and the control terminal 300 transmits the clock signal Clk to each display driving circuit 400. The clock signal CLK is a continuous pulse signal including a plurality of high-level phases and low-level phases for controlling the data shift and gray scale display in the panel driving circuit 400. Taking a common positive driving mode as an example, a plurality of driving output ends Out of the display screen driving circuit 400 are respectively connected with cathodes of a plurality of LED lamps, and meanwhile, anode ends of the plurality of LED lamps are all connected with a power supply VDD; when the driving output terminal Out provides a pull-down constant current, the corresponding LED lamp is lighted.
The above-described respective modules in the display screen driving apparatus may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in the various embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the various embodiments provided herein may include at least one of relational databases and non-relational databases. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processors referred to in the embodiments provided herein may be general purpose processors, central processing units, graphics processors, digital signal processors, programmable logic units, quantum computing-based data processing logic units, etc., without being limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the present application. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application shall be subject to the appended claims.
Claims (10)
1. The utility model provides a display screen drive circuit, its characterized in that, display screen drive circuit includes decoding storage module and display drive module, decoding storage module with display drive module connects, wherein:
the decoding memory module comprises a first input end and a second input end, wherein the first input end is used for receiving a data signal, the second input end is used for receiving a clock signal, and the decoding memory module is used for: reading a data signal based on the clock signal; if the data signal accords with the target data type, storing the read data signal as display data;
the display driving module is connected with at least one LED lamp and comprises a third input end, wherein the third input end is used for synchronously acquiring the clock signal, and the display driving module is used for acquiring the display data; and performing constant current driving on the LED lamp corresponding to the display data based on the clock signal and the display data.
2. The display screen driving circuit of claim 1, wherein the decoding memory module further comprises a first output connected to a first input of a next display screen driving circuit for transmitting the data signal to the next display screen driving circuit.
3. The display screen driving circuit according to claim 1, wherein the decoding storage module comprises a registering module, a judging module and a storage module which are sequentially connected; the storage module is also connected with the display driving module, wherein:
the register module comprises a first input end and a second input end, wherein the first input end is used for receiving a data signal, the second input end is used for receiving a clock signal, and the register module is used for reading the data signal based on the clock signal;
the judging module is used for acquiring the data signal and judging whether the data signal accords with a target data type or not; if the data signal accords with the target data type, the data signal is sent to the storage module;
the storage module is used for storing the data signals as display data.
4. A display screen driving circuit according to claim 3, wherein the judging module is further configured to:
judging whether the data signal is an idle state code or not based on the data signal;
if not, the data signal accords with the target data type; if yes, the data signal does not conform to the target data type.
5. The display screen driving circuit according to claim 1, wherein the display driving module comprises a display control module and a constant current driving module, the display control module is connected with the constant current driving module, and the display control module is further connected with the decoding storage module; the constant current driving module is connected with at least one LED lamp;
the display control module comprises a third input end, wherein the third input end is used for synchronously acquiring the clock signal, and the display control module is used for acquiring the display data and sending a control signal to the constant current driving module based on the clock signal and the display data;
and the constant current driving module is used for performing constant current driving on the LED lamp corresponding to the display data based on the control signal.
6. A display driving method applied to the display driving circuit according to any one of claims 1 to 5, comprising:
reading a data signal based on the clock signal;
if the data signal accords with the target data type, storing the read data signal as display data;
and performing constant current driving on the LED lamp corresponding to the display data based on the clock signal and the display data.
7. The method of claim 6, wherein the reading the data signal based on the clock signal comprises:
and sending the data signal to the next display screen driving circuit.
8. The method of claim 6, wherein the storing the read data signal as display data if the data signal meets a target data type comprises:
judging whether the data signal is an idle state code or not based on the data signal;
if not, the data signal accords with the target data type; if yes, the data signal does not conform to the target data type.
9. A display driving apparatus comprising a control terminal and at least one display driving circuit as claimed in any one of claims 1 to 5,
the control end comprises a data signal output end and a clock signal output end, is connected with a first input end of the first display screen driving circuit through the data signal output end and a second input end of the display screen driving circuit through the clock signal output end respectively, and is used for sending data signals and clock signals to the display screen driving circuit through the data signal output end and the clock signal output end respectively;
the display screen driving circuit is used for: reading a data signal based on the clock signal; if the data signal accords with the target data type, storing the read data signal as display data; and performing constant current driving on the LED lamp corresponding to the display data based on the clock signal and the display data.
10. The display driving apparatus according to claim 9, wherein when the display driving circuits are at least two,
the display screen driving circuit further comprises a first output end, and at least two display screen driving circuits are sequentially connected in series through the first output end and the first input end.
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