CN113470555A - LED display driving chip open-circuit lamp bead detection method - Google Patents
LED display driving chip open-circuit lamp bead detection method Download PDFInfo
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- CN113470555A CN113470555A CN202110803105.0A CN202110803105A CN113470555A CN 113470555 A CN113470555 A CN 113470555A CN 202110803105 A CN202110803105 A CN 202110803105A CN 113470555 A CN113470555 A CN 113470555A
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The invention discloses a method for detecting open-circuit lamp beads of an LED display driving chip, and belongs to the field of LED display. Setting chip channel number C, line scanning number R and line changing signal SCAN; setting a C bit binary number OPEN; starting an OPEN circuit detection function, setting PWM (pulse width modulation) outputs of all C channels to be high levels, comparing output voltages of all the channels with a preset voltage by using an analog circuit, judging that the channels are OPEN circuits if the output voltages are smaller than the preset voltage, and expressing a detection result by using an OPEN signal; pulling up the SCAN signal, starting to detect whether the first row of lamp beads is OPEN or not, pulling down the SCAN signal after the detection is finished, and pulling down the detection result OPEN on the falling edge of the SCAN signal1Writing the data into an address 0 of a built-in SRAM of the chip until all rows are detected; closing the open circuit detection function and starting to normally display the picture; in each line feed time, the chip reads C gray data to be displayed in the next line and OPEN circuit information OPEN of the next line from the on-chip SRAM, and for the bit with the binary value of 1 in the OPEN signal, the corresponding gray data and the OPEN circuit information OPEN are readChannel, turn off its PWM output.
Description
Technical Field
The invention relates to the technical field of LED display, in particular to a method for detecting open-circuit lamp beads of an LED display driving chip.
Background
The LED is also called as a light emitting diode, and has the advantages of low power consumption, high energy efficiency, environmental protection and the like. The LED display screen adopting the LED lamp beads as the light-emitting units has good display effect and high maintainability, and is widely applied to various indoor and outdoor occasions.
In order to save cost and reduce the area and layout difficulty of the driving panel, the LED display screen on the market at present adopts a multi-channel multi-row scanning design, namely, one LED display driving chip can drive a plurality of LED lamp beads. In the LED lamp beads driven by one driving chip, if one lamp bead is in an open circuit, the lamp beads in the same row and the same column with the lamp bead are all in micro conduction, and when a column channel corresponding to the lamp bead is opened, a cross phenomenon taking an open circuit point as a center is shown on a display screen, so that the display effect is seriously influenced.
To solve the open cross phenomenon, the LED display driving chip generally has an open circuit detection function. The conventional method is to detect the open circuit dead pixel in real time, close the PWM output of the channel after detecting the dead pixel, and store the detection result in the register. The method still normally outputs PWM before the open circuit dead pixel is detected, and the open circuit cross phenomenon cannot be completely eliminated; meanwhile, as the number of channels and the number of line sweeps increase, a large number of registers are needed to store open-circuit information, and the chip area and the chip cost are greatly increased. Therefore, there is a need for an open circuit detection method that better solves the open cross problem and does not consume too much chip area.
Disclosure of Invention
The invention aims to provide a method for detecting an open-circuit lamp bead of an LED display driving chip, which aims to solve the problem that the existing detection method still normally outputs PWM before an open-circuit dead pixel is detected, and the phenomenon of an open-circuit cross cannot be completely eliminated.
In order to solve the technical problem, the invention provides a method for detecting an open-circuit lamp bead of an LED display driving chip, which comprises the following steps:
step 2, setting a line feed signal SCAN;
step 3, setting a C-bit binary number OPEN for representing OPEN-circuit information of the C channel lamp beads;
step 4, starting an OPEN circuit detection function, setting PWM (pulse width modulation) outputs of all C channels of the LED display driving chip to be high levels, comparing output voltages of all the channels with a preset voltage by using an analog circuit, judging that the LED display driving chip is OPEN circuit if the output voltages are smaller than the preset voltage, and expressing a detection result by using an OPEN signal;
step 5, pulling up the SCAN signal, starting to detect whether the first row of lamp beads is OPEN or not, pulling down the SCAN signal after the detection is finished, and pulling down the detection result OPEN on the falling edge of the SCAN signal1Writing the address into an address 0 of an SRAM built in the LED display driving chip;
step 6, repeating the step 5, and enabling the detection result OPEN of the r rowrWriting an address R-1 of the SRAM until all rows are detected, wherein R is more than or equal to 1 and less than or equal to R;
step 7, closing the open circuit detection function and starting to normally display the picture;
and 8, in each line feed time, the LED display driving chip reads C gray data to be displayed in the next line and OPEN circuit information OPEN of the next line from the on-chip SRAM, and for a channel corresponding to a bit with a binary value of 1 in an OPEN signal, namely the OPEN channel, the PWM output is closed.
Optionally, in step 1, the number of channels C represents the maximum number of beads that can be driven by the LED display driver chip at the same time, R represents the number of rows of LED beads scanned by the LED display driver chip, and the number of beads driven by the LED display driver chip is cxr.
Optionally, in step 2, the LED display driving chip switches the scanning line at a rising edge of the SCAN signal.
Optionally, in step 3, the most significant bit MSB to the least significant bit LSB of the OPEN correspond to channels 0 to C-1, respectively, where binary 0 indicates that the lamp bead is normal, and binary 1 indicates that the lamp bead is OPEN-circuited.
Optionally, in step 5, the SCAN signal is pulled high, whether the first row of lamp beads is OPEN-circuited is detected, the SCAN is always kept at a high level during the detection, the SCAN signal is pulled low after the detection is finished, and the detection result OPEN is detected on the falling edge of the SCAN signal1And writing the address into an address 0 of the SRAM built in the LED display driving chip.
Optionally, in step 6, step 5 is repeated according to the line scan number R, the LED lamp beads in all the scan lines are detected, and the detection result is written into the on-chip SRAM.
Optionally, in step 8, in each line feed time, assuming that the line is switched to the r-th line, the OPEN circuit information OPEN is first read from the address r-1 of the SRAMrReading C pieces of gray data for display; close OPENrThe channel corresponding to the bit with binary value 1 in the signal.
The invention has the beneficial effects that:
(1) the LED display driving chip open-circuit lamp bead detection method provided by the invention can effectively solve the problem of an open-circuit cross on an LED display screen;
(2) the invention uses the on-chip SRAM to store the open-circuit detection result, which can effectively reduce the chip area and reduce the chip cost.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting open-circuit lamp beads of an LED display driving chip provided by the invention;
FIG. 2 is a timing diagram of the open-circuit lamp bead detection method of the LED display driving chip provided by the invention;
fig. 3 is a timing diagram of the LED display screen according to the present invention shielding the open channel by the open detection result during the normal display process.
Detailed Description
The following describes the method for detecting an open-circuit lamp bead of an LED display driver chip according to the present invention in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Example one
The invention provides a method for detecting open-circuit lamp beads of an LED display driving chip, which has a flow shown in figure 1 and comprises the following steps:
the number of the channels C represents the maximum number of the lamp beads which can be driven by the LED display driving chip at the same moment, R represents the number of the LED lamp bead lines scanned by the LED display driving chip, and the number of the lamp beads driven by the LED display driving chip is C multiplied by R;
step 2, setting a line feed signal SCAN; the LED display driving chip switches scanning lines on the rising edge of the SCAN signal;
step 3, setting a C-bit binary number OPEN for representing OPEN-circuit information of the C channel lamp beads; the MSB of the highest bit to the LSB of the lowest bit of the OPEN respectively correspond to a channel 0 to a channel C-1, a binary 0 represents that the lamp beads are normal, and a binary 1 represents that the lamp beads are OPEN;
step 4, starting an OPEN circuit detection function, setting PWM (pulse width modulation) outputs of all C channels of the LED display driving chip to be high levels, comparing output voltages of all the channels with a preset voltage by using an analog circuit, judging that the LED display driving chip is OPEN circuit if the output voltages are smaller than the preset voltage, and expressing a detection result by using an OPEN signal;
step 5, pulling up the SCAN signal, starting to detect whether the first row of lamp beads is OPEN-circuited, keeping the SCAN at a high level all the time during detection, pulling down the SCAN signal after detection, and pulling down a detection result OPEN on a falling edge of the SCAN signal1Writing the address into an address 0 of an SRAM built in the LED display driving chip;
step 6, according to the line scanning number R, repeating the step 5, and enabling the detection result OPEN of the R-th linerWriting an address R-1 of the SRAM until all rows are detected, wherein R is more than or equal to 1 and less than or equal to R;
step 7, closing the open circuit detection function and starting to normally display the picture;
step 8, in each line feed time, the LED display driving chip reads C gray data to be displayed in the next line and OPEN circuit information OPEN of the next line from the on-chip SRAM, and for a channel corresponding to a bit with a binary value of 1 in an OPEN signal, namely the OPEN channel, the PWM output is closed;
during each line feed time, assuming a switch to the r-th line, OPEN information OPEN is first read from the address r-1 of the SRAMrReading C gray data for displayShown in the specification; close OPENrThe channel corresponding to the bit with binary value 1 in the signal.
Fig. 2 is a timing diagram of a method for detecting an open-circuit lamp bead of an LED display driver chip according to the present invention, where in fig. 1, the number of channels C is set to 16, and the number of line sweeps R is set to 32. The OPEN _ DETECT _ EN signal is pulled high to indicate that the OPEN circuit detection function is enabled, and the SCAN signal is pulled high to indicate whether the 16 channels starting to DETECT the first row are OPEN-circuited by the lamp beads. The analog circuit compares the output voltages of the 16 channels with a preset voltage and stores the comparison result in the OPEN signal. After the detection is finished, the OPEN signal is stable, the SCAN signal is pulled down, a chip selection signal SRAM _ CEN and a write enable signal SRAM _ WR of the on-chip SRAM are pulled up to be effective, and the OPEN is written into an address 0 of the SRAM on the rising edge of an SRAM clock signal SRAM _ CLK; after the OPEN circuit information of the first row of scanning is written into the SRAM, the SCAN signal is pulled high again, the next row of scanning is switched, whether the lamp beads are OPEN or not in 16 channels of the second row of scanning is detected, and the OPEN circuit information OPEN is written into the address 1 of the SRAM after the detection is finished. And repeating the steps until all the open circuit detection and the open circuit information storage of 32 rows of scanning are completed. The OPEN _ DETECT _ EN signal is pulled low exiting the OPEN circuit detection function.
Fig. 3 is a timing diagram illustrating the open circuit information obtained by the open circuit detection method during normal display of the LED screen to shield the open circuit channel to eliminate the open cross phenomenon. SRAM addresses 0-31 are used to store 32 line-scan open circuit detection results, and gray data is stored in address space at address 32 and beyond. In fig. 3, before displaying the gray scale data of the first row, the SRAM chip select signal SRAM _ CEN and the read enable signal SRAM _ RD are pulled high and active, the LED display driver chip first reads the 16-bit OPEN circuit information OPEN of the first row from the SRAM address 0, and the OPEN corresponds to the channels 0 to 15 from the highest bit to the lowest bit respectively; successively reading 16 pieces of gradation data, corresponding to channels 0 to 15, respectively; pulling down SRAM _ CEN and SRAM _ RD, and starting to display the first row; in the display process, if a certain bit in the OPEN signal is 1, namely the corresponding channel is OPEN-circuited, the PWM output of the channel is closed, so that the problem of OPEN-circuit cross is solved. And after the first row is displayed, repeating the steps, and circularly reading the open-circuit information and the gray data of 1-32 rows for displaying.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (7)
1. The method for detecting the open circuit lamp bead of the LED display driving chip is characterized by comprising the following steps of:
step 1, setting the number C of channels and the number R of line sweeps of an LED display driving chip, wherein C, R are positive integers;
step 2, setting a line feed signal SCAN;
step 3, setting a C-bit binary number OPEN for representing OPEN-circuit information of the C channel lamp beads;
step 4, starting an OPEN circuit detection function, setting PWM (pulse width modulation) outputs of all C channels of the LED display driving chip to be high levels, comparing output voltages of all the channels with a preset voltage by using an analog circuit, judging that the LED display driving chip is OPEN circuit if the output voltages are smaller than the preset voltage, and expressing a detection result by using an OPEN signal;
step 5, pulling up the SCAN signal, starting to detect whether the first row of lamp beads is OPEN or not, pulling down the SCAN signal after the detection is finished, and pulling down the detection result OPEN on the falling edge of the SCAN signal1Writing the address into an address 0 of an SRAM built in the LED display driving chip;
step 6, repeating the step 5, and enabling the detection result OPEN of the r rowrWriting an address R-1 of the SRAM until all rows are detected, wherein R is more than or equal to 1 and less than or equal to R;
step 7, closing the open circuit detection function and starting to normally display the picture;
and 8, in each line feed time, the LED display driving chip reads C gray data to be displayed in the next line and OPEN circuit information OPEN of the next line from the on-chip SRAM, and for a channel corresponding to a bit with a binary value of 1 in an OPEN signal, namely the OPEN channel, the PWM output is closed.
2. The method for detecting open-circuit lamp beads of an LED display driver chip according to claim 1, wherein in step 1, the number of channels C represents the maximum number of lamp beads that can be driven by the LED display driver chip at the same time, R represents the number of rows of LED lamp beads scanned by the LED display driver chip, and the number of lamp beads driven by the LED display driver chip is cxr.
3. The method for detecting the open lamp bead of the LED display driver chip of claim 2, wherein in the step 2, the LED display driver chip switches the SCAN lines at a rising edge of the SCAN signal.
4. The method for detecting the OPEN lamp bead of the LED display driver chip according to claim 3, wherein in the step 3, the most significant bit MSB to the least significant bit LSB of the OPEN respectively correspond to the channel 0 to the channel C-1, the binary 0 indicates that the lamp bead is normal, and the binary 1 indicates that the lamp bead is OPEN.
5. The method as claimed in claim 4, wherein in step 5, the SCAN signal is pulled high to start detecting whether the first row of beads is OPEN-circuited, the SCAN is always kept at a high level during the detection, the SCAN signal is pulled low after the detection is finished, and the detection result OPEN is obtained at the falling edge of the SCAN signal1And writing the address into an address 0 of the SRAM built in the LED display driving chip.
6. The method for detecting open-circuit lamp beads of an LED display driving chip according to claim 5, wherein in the step 6, the step 5 is repeated according to the line scanning number R, LED lamp beads of all scanning lines are detected, and the detection result is written into an on-chip SRAM.
7. The method for detecting the OPEN lamp bead of the LED display driver chip according to claim 6, wherein in step 8, in each line feed time, assuming that the line is switched to the r-th line, the OPEN information OPEN is first read from the address r-1 of the SRAMrReading C pieces of gray data for display; close OPENrThe channel corresponding to the bit with binary value 1 in the signal.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114023250A (en) * | 2021-11-10 | 2022-02-08 | 成都利普芯微电子有限公司 | Driving chip, display assembly and driving method |
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