CN112634828B - LED display system, constant current driving circuit and display control method - Google Patents
LED display system, constant current driving circuit and display control method Download PDFInfo
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- CN112634828B CN112634828B CN202110252757.XA CN202110252757A CN112634828B CN 112634828 B CN112634828 B CN 112634828B CN 202110252757 A CN202110252757 A CN 202110252757A CN 112634828 B CN112634828 B CN 112634828B
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- 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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Abstract
The application discloses a display control method of an LED display device, which comprises the following steps: rewriting the display data of the corresponding storage space into a mark value of the abnormal working state according to the address of the LED lamp in the abnormal working state; and closing the output of the corresponding drive port according to the stored mark value of the abnormal working state. The application also provides an LED display system and a constant current driving circuit, which can store the working state of the LED lamp under the condition of not increasing additional storage space, save the storage space and reduce the cost of the driving circuit and the LED display screen system.
Description
Technical Field
The invention relates to the technical field of LED display, in particular to an LED display system, a constant current driving circuit and a display control method.
Background
An LED (Light Emitting Diode) display screen is a display that uses LED lamps as pixel elements. The LED display screen has the advantages of high brightness, low working voltage, low power consumption, large scale, long service life, impact resistance, stable performance and the like, and is widely applied to places such as stadiums, commercial office buildings, markets, schools, billboards and the like.
The LED display screen system usually needs to work for a long time, and is often in a severe environment with high temperature and high humidity, which easily causes damage to the LED lamp, and forms an open circuit or a short circuit of the LED lamp. When the open short circuit phenomenon occurs, the damaged LED lamp can not be normally lightened, and the phenomenon that the LED lamps on the same row and the same column with the LED lamp are overlooked on the LED display screen can be caused, so that the image quality is greatly influenced. In order to maintain the normal display function of the LED display screen, the prior art detects the working states of all the LED lamps on the LED display screen in a frame period, and closes the driving ports corresponding to the abnormal LED lamps in the following frame period, so as to shield the LED lamps in the abnormal working states, thereby improving the image quality.
In the above frame period, before the LED lamp is turned on each time, the prestored operating state of the LED lamp needs to be read, and if there is an LED lamp with an abnormal operating state in the currently turned-on LED lamps, the driving port corresponding to the abnormal LED lamp is turned off.
In the prior art, a storage unit is usually added in the constant current driving circuit to store the operating state of the LED lamp, and the storage unit needs to store the operating state information of all the LED lamps managed by one constant current driving circuit. Taking a constant current driving circuit with 16 driving ports as an example, the number of line scans which need to be supported is at most 64, and if the operating state information of the LED lamp needs to be represented by 0/1 values of 1bit, each constant current driving circuit needs to increase the storage capacity of 16 × 64 bits to store the operating state information of the LED lamp.
The cost of a single constant current driving circuit is increased due to the increase of the storage capacity, and the cost of the whole system is greatly increased due to the fact that the LED display screen needs a large number of constant current driving circuits, especially a large-area display screen.
Disclosure of Invention
In view of the foregoing problems, an object of the present invention is to provide an LED display system, a constant current driving circuit and a display control method, which can store the operating state of an LED lamp without increasing additional storage space, save storage space, and reduce the cost of the driving circuit and the LED display screen system.
According to a first aspect of the present invention, there is provided a display control method of an LED display device, comprising: rewriting the display data of the corresponding storage space into a mark value of the abnormal working state according to the address of the LED lamp in the abnormal working state; and closing the output of the corresponding drive port according to the stored mark value of the abnormal working state.
Preferably, the LED display device determines whether the display data of each storage space is a flag value of an abnormal operating state; when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame; when the display data of the storage space is the mark value of the abnormal working state, the display data of the storage space is kept unchanged.
Preferably, the flag value of the abnormal operating state is any one of gray-scale values of display data.
Preferably, the display control method further includes: whether the working state of the LED lamp is abnormal or not is detected in the frame period of the LED display device.
Preferably, the step of judging whether the operating state of the LED lamp is abnormal includes: detecting the working voltage of an LED lamp in the frame period of the LED display device; and judging whether the working state of the LED lamp is abnormal or not according to the working voltage of the LED lamp.
Preferably, the step of detecting the operating voltage of the LED lamp includes: and in a line scanning stage of a frame period, detecting the voltage of a driving port of a constant current driving module to obtain the working voltage of the LED lamp, wherein the driving ports of the constant current driving module correspond to the columns of the LED lamp one to one.
Preferably, the step of judging whether the operating state of the LED lamp is abnormal includes: judging whether the voltage of a driving port corresponding to the LED lamp is in a normal voltage range or not, and if the voltage of the driving port is out of the normal voltage range, considering that the working voltage of the LED lamp is abnormal; and if the voltage of the driving port is within a normal voltage range, the working voltage of the LED lamp is considered to be normal.
Preferably, the step of determining whether the operating state of the LED lamp is abnormal further includes: if the working voltage of the LED lamp is abnormal, confirming that the LED lamp is in an abnormal working state; and if the working voltage of the LED lamp is normal, confirming that the LED lamp is in a normal working state.
According to a second aspect of the present invention, there is provided an LED display system comprising: a timing controller for providing a row display control signal and a column display control signal including at least display data; and an LED display device connected with the time schedule controller to obtain the row display control signal and the column display control signal, wherein the LED display device comprises an LED lamp array and a constant current driving circuit, the constant current driving circuit respectively provides constant current for a plurality of LED lamps of the LED lamp array according to the column display control signal in a frame period of the LED display device to obtain effective brightness, and the constant current driving circuit rewrites display data of a corresponding storage space into a mark value of an abnormal working state according to an address of the LED lamp of the abnormal working state in the frame period of the LED display device; and closing the output of the corresponding drive port according to the stored mark value of the abnormal working state.
Preferably, the LED display device determines whether the display data in the storage space is a flag value of an abnormal operating state; when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame; when the display data of the storage space is the mark value of the abnormal working state, the display data of the storage space is kept unchanged.
Preferably, the flag value of the abnormal operating state is any one of gray-scale values of display data.
Preferably, in a frame period of the LED display device, the constant current driving circuit further detects whether an operating state of the LED lamp is abnormal.
Preferably, in a frame period of the LED display device, the constant current driving circuit detects operating voltages of the plurality of LED lamps; and judging whether the working states of the LED lamps are abnormal or not according to the working voltages of the LED lamps.
Preferably, the LED display device further includes a line scanning circuit generating a line scanning signal according to the line display control signal, the line scanning being performed in a frame period of the LED display device to drive the plurality of LED lamps in a line.
Preferably, the constant current driving circuit includes: a communication module for receiving and transmitting column display control signals; the storage module is used for storing the display data in the column display control signals; the display processing module is connected with the storage module to read display data and generate column driving signals according to the display data; the constant current driving module is connected with the display processing module to receive the column driving signals and generate a plurality of constant currents according to the column driving signals, and a plurality of driving ports of the constant current driving module are connected with the LED lamps of the corresponding columns of the LED lamps and respectively provide the plurality of constant currents; the detection module is connected to the plurality of driving ports of the constant current driving module, detects the voltages of the plurality of driving ports of the constant current driving module to obtain the working voltages of the plurality of LED lamps, and judges whether the working states of the plurality of LED lamps are abnormal or not according to the working voltages of the plurality of LED lamps; the storage module rewrites the display data of the corresponding storage space into a mark value of the abnormal working state according to the address of the LED lamp in the abnormal working state; and the display processing module closes the output of the corresponding driving port according to the stored mark value of the abnormal working state.
Preferably, the storage module comprises a display data storage unit and a judgment unit, wherein the display data storage unit is used for storing display data; the judging unit is used for judging whether the display data of each storage space in the display data storage unit is a mark value of an abnormal working state or not; when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame; when the display data of the storage space is the mark value of the abnormal working state, the display data of the storage space is kept unchanged.
Preferably, for each of the plurality of LED lamps, the detection module performs the following steps: judging whether the voltage of a driving port corresponding to the LED lamp is in a normal voltage range or not, and if the voltage of the driving port is not in the normal voltage range, considering that the working voltage of the LED lamp is abnormal; and if the voltage of the driving port is within a normal voltage range, the working voltage of the LED lamp is considered to be normal.
Preferably, for each of the plurality of LED lamps, the detection module further performs the following steps: if the working voltage of the LED lamp is abnormal, confirming that the LED lamp is in an abnormal working state; and if the working voltage of the LED lamp is normal, confirming that the LED lamp is in a normal working state.
According to a third aspect of the present invention, there is provided a constant current driving circuit for an LED display device, comprising: a communication module for receiving and transmitting column display control signals; the storage module is used for storing the display data in the column display control signals; the display processing module is connected with the storage module to read display data and generate column driving signals according to the display data; the constant current driving module is connected with the display processing module to receive the column driving signals and generate a plurality of constant currents according to the column driving signals, and a plurality of driving ports of the constant current driving module are connected with the LED lamps of the corresponding columns of the LED lamps and respectively provide the plurality of constant currents; the detection module is connected to the plurality of driving ports of the constant current driving module, detects the voltages of the plurality of driving ports of the constant current driving module to obtain the working voltages of the plurality of LED lamps, and judges whether the working states of the plurality of LED lamps are abnormal or not according to the working voltages of the plurality of LED lamps; the storage module rewrites the display data of the corresponding storage space into a mark value of the abnormal working state according to the address of the LED lamp in the abnormal working state; and the display processing module closes the output of the corresponding driving port according to the stored mark value of the abnormal working state.
Preferably, the storage module comprises a display data storage unit and a judgment unit, wherein the display data storage unit is used for storing display data; the judging unit is used for judging whether the value of each storage space in the display data storage unit is a mark value of an abnormal working state or not; when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame; when the display data of the storage space is the mark value of the abnormal working state, the display data of the storage space is kept unchanged.
Preferably, the flag value of the abnormal operating state is any one of gray-scale values of display data.
Preferably, for each of the plurality of LED lamps, the detection module performs the following steps: judging whether the voltage of a driving port corresponding to the LED lamp is in a normal voltage range or not, and if the voltage of the driving port is not in the normal voltage range, considering that the working voltage of the LED lamp is abnormal; and if the voltage of the driving port is within a normal voltage range, the working voltage of the LED lamp is considered to be normal.
Preferably, for each of the plurality of LED lamps, the detection module further performs the following steps:
if the working voltage of the LED lamp is abnormal, confirming that the LED lamp is in an abnormal working state; and if the working voltage of the LED lamp is normal, confirming that the LED lamp is in a normal working state.
According to the LED display system, the constant current driving circuit and the display control method, the value of the display data storage space corresponding to the address of the LED lamp in the abnormal working state is rewritten into the mark value of the abnormal working state, the working state of the LED lamp can be stored under the condition that no extra storage space is added, the storage space is saved, and the cost of the driving circuit and the cost of the LED display screen system are reduced.
Further, the output of the driving port of the driving circuit of the column where the LED lamp corresponding to the marker value of the abnormal operating state is turned off according to the display data of the storage space to disable the failed LED lamp, so that the lighting of other LED lamps in the same row and column is not affected.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 shows a schematic block diagram of an LED display system according to an embodiment of the present invention.
Fig. 2 shows a schematic block diagram of a constant current driving circuit according to an embodiment of the present invention.
Fig. 3 illustrates a flowchart of a display control method of an LED display system according to an embodiment of the present invention.
Fig. 4 illustrates a flowchart of a display control method of a memory module according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
FIG. 1 shows a schematic block diagram of an LED display system according to an embodiment of the present invention. The LED display system 100 includes a timing controller 101 and an LED display device 102.
The timing controller 101 generates display data, also referred to as gray scale data, for a plurality of successive image frames from the text, image and video content of the computer. The timing controller 101 supplies display control signals including a row display control signal including, for example, a clock signal and a row control signal, and a column display control signal including, for example, a clock signal and display data.
The LED display device 102 is connected to the timing controller 101 via a cable, for example, to receive a row display control signal and a column display control signal. The LED display device 102 includes an LED lamp array 110, a constant current driving circuit 120, and a line scanning circuit 130.
The LED lamp array 110 includes a plurality of LED lamps 11 arranged in an m x n array in rows and columns. The constant current driving circuit 120 generates a column driving signal according to the column display control signal, and supplies a constant current to each of the plurality of LED lamps 11 of the LED lamp array 110 to obtain effective luminance corresponding to the gray-scale data. The line scanning circuit 130 generates a line scanning signal in accordance with a line display control signal, and performs line scanning in a frame period of the LED display device 102 to drive the plurality of LED lamps 11 in lines.
The row scanning circuit 130 includes, for example, a plurality of switches each connected between a power supply terminal and the anode of a corresponding row of LED lamps of the LED lamp array 110, and the constant current driving circuit 120 includes, for example, a plurality of constant current sources each connected between a ground terminal and the cathode of a corresponding column of LED lamps of the LED lamp array 110. During the line scanning phase of the frame period of the LED display device 102, the line scanning circuit 130 provides a supply voltage VCC to the anodes of the selected line of LED lamps, and the constant current sources of the constant current driving circuit 120 generate constant currents, thereby lighting the selected line of LED lamps and generating effective brightness corresponding to the gray scale data.
The constant current driving circuit 120 of the LED display device 102 also has a function of detecting the operating state of the LED lamp. In a frame period of the LED display device 102, the constant current driving circuit 120 detects operating voltages of the plurality of LED lamps 11 of the LED lamp array 110, determines whether operating states of the plurality of LED lamps 11 are abnormal according to the operating voltages of the plurality of LED lamps 11, stores operating state information of the plurality of LED lamps 11, and turns off an output of a driving port where the LED lamp in the abnormal operating state is located according to the operating state information of the plurality of LED lamps 11. Specifically, in a line scanning stage of a frame period, detecting a driving port voltage of the constant current driving circuit 120 to obtain a working voltage of the LED lamp, wherein the constant current driving circuit 120 and the line scanning circuit 130 are respectively connected to the timing controller 101, receive a display control signal, and are controlled by the timing controller 101 to display in a unified manner, and the constant current driving circuit 120 rewrites display data of a corresponding storage space into a flag value of an abnormal working state according to an address of the LED lamp of the abnormal working state; and closing the output of the corresponding drive port according to the stored mark value of the abnormal working state.
Although the LED display device 102 is shown as a unitary structure in fig. 1, it is understood that the LED display device 102 may be assembled from a plurality of LED modules. Each LED module has its own LED lamp array 110, constant current driving circuit 120, and line scanning circuit 130. The LED modules are connected in cascade with each other, respectively display a part of image pictures according to the display control signals, and forward the display control signals to the LED modules of the next stage.
Fig. 2 shows a schematic block diagram of a constant current driving circuit according to an embodiment of the present invention. The constant current driving circuit 120 includes a communication module 121, a constant current driving module 122, a detection module 123, a storage module 124, and a display processing module 125.
The communication module 121 is connected to the timing controller 101 or the previous LED module to receive the row display control signal Di, and connected to the next LED module to transmit the row display control signal Do. The communication module 121 receives the column display control signal.
The storage module 124 includes a display data storage unit 1241 and a determination unit 1243. The display data storage unit 1241 is configured to store display data, and when the detection module 123 detects that the LED lamp is in the abnormal operating state, rewrite the display data in the corresponding storage space in the display data storage unit 1241 to the flag value in the abnormal operating state according to the address of the LED lamp in the abnormal operating state.
In this embodiment, the display data is gray scale data, and the flag value of the abnormal operating state is any one of gray scale values of the display data. In order to achieve a good display effect of the image, the number of bits of the display data is usually greater than 8 bits, for example, 14 to 16 bits. Taking 16-bit display data as an example, the expressive gray scale is 0-65535, which is 65536 levels. For image display, 65536 levels of gray scale levels are very abundant. The marking value of the abnormal working state can select one gray-scale value to mark that the LED lamp is in the abnormal working state. For example, in 16-bit display data, 0xFFFF is used to indicate that the LED lamp is in an abnormal operation state.
When detecting that the LED lamp corresponding to a certain row of driving port is in an abnormal operating state, marking a storage space corresponding to an address of the LED lamp in the abnormal operating state in the display data storage unit 1241: display data of a memory space corresponding to an address of an LED lamp in an abnormal operation state is rewritten to a flag value indicating the abnormal operation state, for example, 0 xFFFF.
In the prior art, a storage unit is newly added in the storage module 124 to store the operating states of all the LED lamps, for example, 1bit is used to record the operating states of the LED lamps, 0 indicates normal, and 1 indicates abnormal. When the LED lamp in the abnormal working state is detected, the value of the storage space corresponding to the address of the LED lamp in the abnormal working state is modified from 0 to 1. The display processing module respectively obtains the stored display data and the working state of the LED lamp from the storage module 124, and generates a corresponding column driving signal according to the working state of the LED lamp, and turns off the output of the driving port corresponding to the column address of the LED lamp corresponding to the flag value of the abnormal working state.
The existing constant current driving circuit needs to increase the storage capacity to store the working state information of the LED lamp. The increase of the storage capacity causes the cost of a single driving circuit to increase, and the cost of the whole system is greatly increased due to the fact that the LED display screen needs a large number of driving circuits, especially a large-area display screen.
In the embodiment, the value of the storage space corresponding to the address of the LED lamp in the abnormal operation state is rewritten into the flag value of the abnormal operation state, so that the operation state of the LED lamp can be stored without increasing an additional storage space.
The judging unit 1243 is configured to judge whether the display data in each storage space in the display data storage unit 1241 is a flag value of an abnormal operating state; when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame; when the display data of the storage space is the mark value of the abnormal working state, the display data of the storage space is kept unchanged.
The communication module 121 sends the display data of the next frame period to the display data storage unit 1241, and before the display data of each LED lamp is written, the determining unit 1243 reads the display data of the corresponding storage space to determine whether the display data of the storage space is a flag value of an abnormal operating state; when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame period; when the display data of the storage space is a flag value (for example, 0xFFFF) of an abnormal operating state, the display data of the storage space remains unchanged.
The display processing module 125 is connected to the display data storage unit 1241 to read the display data and generate the column driving signals according to the display data.
The constant current driving module 122 generates a plurality of constant currents according to the column driving signals, a plurality of driving ports of the constant current driving module 122 are connected to corresponding columns of LED lamps 11 in the plurality of LED lamps 11 of the LED lamp array 110, and respectively provide a plurality of constant currents, and each driving port number corresponds to columns T1 to Tm of the LED lamp array 110. Therefore, the constant current driving circuit 120 can realize a display driving function of driving the plurality of LED lamps 11 according to the column display control signal.
The detection module 123 is respectively connected to the plurality of driving ports of the constant current driving module 122, detects the voltages of the plurality of driving ports of the constant current driving module 122 to obtain the working voltages of the plurality of LED lamps 11, and determines whether the working states of the plurality of LED lamps are abnormal according to the working voltages of the plurality of LED lamps 11. The detection module 123 records address information of the LED lamp in an abnormal working state.
When the display processing module 125 reads the flag value of the abnormal operating state, it controls the constant current driving module 122 to turn off the output of the driving port corresponding to the column address where the LED lamp corresponding to the flag value of the abnormal operating state is located; when the mark value of the display data which is not in the abnormal working state is read, a column driving signal is generated according to the display data. The plurality of driving ports of the constant current driving module 122 are connected to corresponding rows of LED lamps among the plurality of LED lamps, and respectively provide the plurality of constant currents.
The display processing module 125 reads the display data from the display data storage unit 1241, and when the read display data is a flag value of an abnormal operating state, for example, 0xFFFF, it indicates that the LED lamp is in the abnormal operating state, controls the constant current driving module 122 to turn off the output of the driving port corresponding to the column address of the LED lamp corresponding to the flag value of the abnormal operating state, and disables the LED lamp in the abnormal operating state. When the read display data is not the flag value of the abnormal operating state, the display processing module 125 generates a column driving signal according to the display data, and the constant current driving module 122 generates a constant current according to the column driving signal to drive the corresponding LED lamp to light.
According to the constant current driving circuit provided by the embodiment of the invention, the value of the storage space corresponding to the address of the LED lamp in the abnormal working state is rewritten into the mark value of the abnormal working state, so that the working state of the LED lamp can be stored under the condition that no extra storage space is added, the storage space is saved, and the cost of the driving circuit and the LED display screen system is reduced.
Fig. 3 illustrates a flowchart of a display control method of an LED display system according to an embodiment of the present invention. For example, steps S01 to S07 are performed inside the LED display device 102 shown in fig. 1.
In step S01, the LED display device 102 starts displaying an image for one frame, and starts line scanning for a frame period.
In this step, referring to fig. 2, the row scanning circuit 130 supplies a supply voltage VCC to the anodes of the selected row of LED lamps, and the constant current sources of the constant current driving circuit 120 generate constant currents, thereby lighting the selected row of LED lamps and controlling the selected row of LED lamps to generate effective brightness corresponding to the gray-scale data.
In step S02, the LED display device 102 determines whether each LED lamp in the selected row of LED lamps should be lit.
In this step, for example, the LED display device 102 acquires display data of the selected row of LEDs, the display processing module 125 in the LED display device 102 reads the display data in the storage module 124, and when the read display data is a flag value of an abnormal operating state, the LED lamp is determined not to be turned on.
In this step, if it is determined that there is an LED lamp that should not be lit in the selected row of LED lamps, the subsequent detecting and determining step is not performed for the LED lamp that should not be lit. For the LED lamps that should be lit in the selected row of LED lamps, the detection step of step S03 is continuously performed.
In step S03, the detection module 123 of the LED display device 102 detects the drive port voltage of the constant current drive module 122 connected to the selected row of LED lamps in the row scanning phase.
In this step, the detection module 123 is connected to the plurality of driving ports of the constant current driving module 122 to obtain the operating voltage of the LED lamp corresponding to the selected row according to the driving port voltage.
In step S04, the detection module 123 of the LED display device 102 determines whether the operating state of the LED lamp is abnormal or not based on the operating voltage of the LED lamp in the selected row.
In this step, the detection module 123 determines whether the driving port voltage corresponding to the selected row of LED lamps is within a normal voltage range, and if the driving port voltage is not within the normal voltage range, the working voltage of the LED lamps is considered to be abnormal; and if the voltage of the driving port is within a normal voltage range, the working voltage of the LED lamp is considered to be normal.
In the step, if the working voltage of the LED lamp is abnormal, the LED lamp is confirmed to be in an abnormal working state; and if the working voltage of the LED lamp is normal, confirming that the LED lamp is in a normal working state.
In this step, if it is determined that there is an LED lamp having an abnormal operating voltage among the selected row of LED lamps, step S05 is performed for the LED having the abnormal operating voltage. For the LED lamps with normal operating voltage in the selected row of LED lamps, step S05 is skipped.
In step S05, the storage module 124 of the LED display device 102 rewrites the display data in the storage space corresponding to the address of the LED lamp in the abnormal operation state to the flag value of the abnormal operation state.
In this step, the detection module 123 obtains address information of the LED lamp in the abnormal operation state.
In step S06, the LED display device 102 determines whether the frame period has ended.
In this step, if the frame period is not finished, the process returns to step S01, and the line scanning phase of the next line of LED lamps is started. If the frame period is over, step S07 is executed, and then display driving of the next frame image and state detection of the LED lamp are started.
Fig. 4 illustrates a flowchart of a display control method of a memory module according to an embodiment of the present invention. For example, steps S21 to S24 are performed inside the storage module 124 shown in fig. 2.
In step S21, it is determined whether or not the display data in each memory space in the display data memory unit 1241 is a flag value of an abnormal operating state.
In step S22, when the display data of the storage space is not the flag value of the abnormal operating state, the display data of the storage space is updated to the display data of the next frame;
in step S23, when the display data of the storage space is the flag value of the abnormal operation state, the display data of the storage space remains unchanged.
In step S24, the display processing module reads the display data in the storage module in each frame period.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (20)
1. A display control method of an LED display device comprises the following steps:
rewriting the display data of the corresponding storage space into a mark value of the abnormal working state according to the address of the LED lamp in the abnormal working state;
closing the output of the corresponding driving port according to the stored mark value of the abnormal working state;
the LED display device judges whether the display data of each storage space is a mark value of an abnormal working state;
when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame;
when the display data of the storage space is the mark value of the abnormal working state, the display data of the storage space is kept unchanged.
2. The display control method according to claim 1, wherein the flag value of the abnormal operating state is any one of gray-scale values of display data.
3. The display control method according to claim 1, further comprising:
whether the working state of the LED lamp is abnormal or not is detected in the frame period of the LED display device.
4. The display control method according to claim 3, wherein the step of detecting whether the operating state of the LED lamp is abnormal includes:
detecting the working voltage of an LED lamp in the frame period of the LED display device;
and judging whether the working state of the LED lamp is abnormal or not according to the working voltage of the LED lamp.
5. The display control method of claim 4, wherein the step of detecting the operating voltage of the LED lamp comprises: in the line scanning stage of the frame period, detecting the voltage of a driving port of the constant current driving module to obtain the working voltage of the LED lamp,
and the driving ports of the constant current driving module correspond to the rows of the LED lamps one to one.
6. The display control method according to claim 5, wherein the step of determining whether the operating state of the LED lamp is abnormal includes:
judging whether the voltage of a driving port corresponding to the LED lamp is in a normal voltage range or not, and if the voltage of the driving port is out of the normal voltage range, considering that the working voltage of the LED lamp is abnormal; and if the voltage of the driving port is within a normal voltage range, the working voltage of the LED lamp is considered to be normal.
7. The display control method according to claim 6, wherein the step of determining whether the operating state of the LED lamp is abnormal further comprises:
if the working voltage of the LED lamp is abnormal, confirming that the LED lamp is in an abnormal working state; and if the working voltage of the LED lamp is normal, confirming that the LED lamp is in a normal working state.
8. An LED display system comprising:
a timing controller for providing a row display control signal and a column display control signal including at least display data;
and
an LED display device connected with the time sequence controller to obtain the row display control signal and the column display control signal, the LED display device comprises an LED lamp array and a constant current drive circuit,
wherein, in a frame period of the LED display device, the constant current driving circuit provides constant current to a plurality of LED lamps of the LED lamp array according to the column display control signal to obtain effective brightness,
in a frame period of the LED display device, the constant current driving circuit rewrites display data of a corresponding storage space into a mark value of an abnormal working state according to an address of an LED lamp in the abnormal working state; closing the output of the corresponding driving port according to the stored mark value of the abnormal working state;
the LED display device judges whether the display data of the storage space is a mark value of an abnormal working state or not; when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame; when the display data of the storage space is the mark value of the abnormal working state, the display data of the storage space is kept unchanged.
9. The LED display system of claim 8, wherein the flag value of the abnormal operation state is any one of gray-scale values of display data.
10. The LED display system of claim 8, wherein the constant current driving circuit further detects whether an operating state of an LED lamp is abnormal in a frame period of the LED display device.
11. The LED display system according to claim 10, wherein the constant current drive circuit detects operating voltages of the plurality of LED lamps in a frame period of the LED display device; and judging whether the working states of the LED lamps are abnormal or not according to the working voltages of the LED lamps.
12. The LED display system of claim 8, wherein the LED display device further comprises a line scan circuit generating a line scan signal according to the line display control signal, the line scan circuit performing line scan in a frame period of the LED display device to drive the plurality of LED lamps in a line.
13. The LED display system of claim 8, wherein the constant current drive circuit comprises:
a communication module for receiving and transmitting column display control signals;
the storage module is used for storing the display data in the column display control signals;
the display processing module is connected with the storage module to read display data and generate column driving signals according to the display data;
the constant current driving module is connected with the display processing module to receive the column driving signals and generate a plurality of constant currents according to the column driving signals, and a plurality of driving ports of the constant current driving module are connected with the LED lamps of the corresponding columns of the LED lamps and respectively provide the plurality of constant currents;
the detection module is connected to the plurality of driving ports of the constant current driving module, detects the voltages of the plurality of driving ports of the constant current driving module to obtain the working voltages of the plurality of LED lamps, and judges whether the working states of the plurality of LED lamps are abnormal or not according to the working voltages of the plurality of LED lamps;
the storage module rewrites the display data of the corresponding storage space into a mark value of the abnormal working state according to the address of the LED lamp in the abnormal working state; and the display processing module closes the output of the corresponding driving port according to the stored mark value of the abnormal working state.
14. The LED display system of claim 13, wherein the storage module comprises a display data storage unit and a determination unit,
the display data storage unit is used for storing display data;
the judging unit is used for judging whether the display data of each storage space in the display data storage unit is a mark value of an abnormal working state or not; when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame; when the display data of the storage space is the mark value of the abnormal working state, the display data of the storage space is kept unchanged.
15. The LED display system of claim 13, wherein the detection module performs the following steps for each of the plurality of LED lamps, respectively:
judging whether the voltage of a driving port corresponding to the LED lamp is in a normal voltage range or not, and if the voltage of the driving port is not in the normal voltage range, considering that the working voltage of the LED lamp is abnormal; and if the voltage of the driving port is within a normal voltage range, the working voltage of the LED lamp is considered to be normal.
16. The LED display system of claim 15, wherein the detection module further performs, for each of the plurality of LED lights, the steps of:
if the working voltage of the LED lamp is abnormal, confirming that the LED lamp is in an abnormal working state; and if the working voltage of the LED lamp is normal, confirming that the LED lamp is in a normal working state.
17. A constant current driving circuit for an LED display device, comprising:
a communication module for receiving and transmitting column display control signals;
the storage module is used for storing the display data in the column display control signals;
the display processing module is connected with the storage module to read display data and generate column driving signals according to the display data;
the constant current driving module is connected with the display processing module to receive the column driving signals and generate a plurality of constant currents according to the column driving signals, and a plurality of driving ports of the constant current driving module are connected with the LED lamps of the corresponding columns of the LED lamps and respectively provide the plurality of constant currents;
the detection module is connected to the plurality of driving ports of the constant current driving module, detects the voltages of the plurality of driving ports of the constant current driving module to obtain the working voltages of the plurality of LED lamps, and judges whether the working states of the plurality of LED lamps are abnormal or not according to the working voltages of the plurality of LED lamps;
the storage module rewrites the display data of the corresponding storage space into a mark value of the abnormal working state according to the address of the LED lamp in the abnormal working state; the display processing module closes the output of the corresponding driving port according to the stored mark value of the abnormal working state;
wherein the storage module comprises a display data storage unit and a judgment unit,
the display data storage unit is used for storing display data;
the judging unit is used for judging whether the value of each storage space in the display data storage unit is a mark value of an abnormal working state or not; when the display data of the storage space is not the mark value of the abnormal working state, updating the display data of the storage space into the display data of the next frame; when the display data of the storage space is the mark value of the abnormal working state, the display data of the storage space is kept unchanged.
18. The constant current drive circuit according to claim 17, wherein the flag value of the abnormal operation state is any one of gray-scale values of display data.
19. The constant current drive circuit according to claim 17, wherein the detection module performs, for each of the plurality of LED lamps, the steps of:
judging whether the voltage of a driving port corresponding to the LED lamp is in a normal voltage range or not, and if the voltage of the driving port is not in the normal voltage range, considering that the working voltage of the LED lamp is abnormal; and if the voltage of the driving port is within a normal voltage range, the working voltage of the LED lamp is considered to be normal.
20. The constant current drive circuit according to claim 19, wherein the detection module further performs, for each of the plurality of LED lamps, the steps of:
if the working voltage of the LED lamp is abnormal, confirming that the LED lamp is in an abnormal working state; and if the working voltage of the LED lamp is normal, confirming that the LED lamp is in a normal working state.
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