CN110379376B - Liquid crystal display for SSVEP and stimulation pattern display method thereof - Google Patents
Liquid crystal display for SSVEP and stimulation pattern display method thereof Download PDFInfo
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- CN110379376B CN110379376B CN201910599671.7A CN201910599671A CN110379376B CN 110379376 B CN110379376 B CN 110379376B CN 201910599671 A CN201910599671 A CN 201910599671A CN 110379376 B CN110379376 B CN 110379376B
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/147—Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
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- 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
- G09G3/34—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 by control of light from an independent source
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- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
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Abstract
The invention discloses a liquid crystal display for SSVEP and a stimulation pattern display method thereof, wherein a backlight module is integrally divided into a plurality of sub-areas, and the flashing frequency, the brightness information and the flashing waveform of each sub-area in the backlight module are independently controlled by a control circuit and a driving circuit, so that the liquid crystal display can display any picture on the full screen, can display a stimulation pattern in a stimulation pattern display area and display any picture in the stimulation pattern display area, and the stimulation pattern display area and the any picture display area are not influenced with each other. The invention uses the backlight module to flicker instead of the prior liquid crystal screen module to realize flicker by converting each frame, so that the flicker frequency, the brightness information and the flicker waveform of the stimulation pattern can be modified by setting the flicker frequency, the brightness information and the flicker waveform of the neutron region of the backlight module, thereby ensuring that the flicker frequency of the stimulation pattern is not limited by the screen refresh rate and the stimulation pattern with any flicker waveform can be displayed.
Description
Technical Field
The invention relates to the technical field of brain-computer interfaces and liquid crystal displays, in particular to a liquid crystal display for SSVEP and a stimulation pattern display method thereof.
Background
Steady-state visual evoked potentials (SSVEP) brain-computer interfaces require a user to look at an image or light of a fixed blinking frequency provided by a visual stimulator. Currently, display devices used as visual stimulators of SSVEP brain-computer interfaces mainly include two types of Liquid Crystal Displays (LCDs) and light-emitting diodes (LEDs).
The LCD is used as a visual stimulator, the backlight module of the LCD is in a normally-on state, a user can determine a pattern to be displayed in each frame of the LCD through the programming of a computer host according to the refresh rate of the LCD, and a required flashing pattern with a certain frequency is generated to be used as an SSVEP stimulating pattern. Since the LCD display can flexibly design the frequency, shape, color, layout and flip mode of the inducing source through a computer program, most of the visual stimulation devices of the brain-computer interface system use the LCD display as a carrier. However, the LCD display can generate stimulation frequency with low precision, the selectable stimulation frequency of the inducing source cannot exceed half of the refresh rate of the LCD display screen, the number of visual stimuli that can be presented is limited, and flickering waveforms such as square waves, sine waves, triangular waves and the like with arbitrary frequencies cannot be displayed.
The LED light sources are adopted as visual stimulators, required brightness, flicker frequency and flicker waveforms comprising sine waves, square waves, sawtooth waves, triangular waves and the like can be generated by independently controlling each LED light source, the refresh rate limit of an LCD (liquid crystal display) does not exist, however, a user cannot rapidly change the shape, color, size and other stimulation parameters closely related to SSVEP (steady state visual evoked potential) of a stimulation pattern through a simple man-machine interaction interface of a computer end, and each induction source can be controlled to generate corresponding brightness, flicker frequency and flicker waveforms only by carrying out program modification in an embedded processor, so that the use and equipment manufacturing cost is high.
In summary, the visual stimulator using the common LCD display and LED light source as the SSVEP brain-computer interface cannot simultaneously meet the requirements of users for quickly designing the stimulation interface through software and obtaining stimulation signals with any flashing frequency and any flashing waveform.
Disclosure of Invention
In view of the above, the present invention provides a liquid crystal display for SSVEP and a method for displaying stimulation patterns thereof, so as to meet the requirements of a user for quickly designing a stimulation interface through software and obtaining a stimulation signal with any flashing frequency and any flashing waveform.
Accordingly, the present invention provides a liquid crystal display for SSVEP, comprising: the liquid crystal display device comprises a liquid crystal screen module, a backlight module for providing backlight for the liquid crystal screen module, a driving circuit electrically connected with the backlight module, a control circuit electrically connected with the driving circuit, a power supply circuit for supplying power to the liquid crystal screen module, the backlight module, the driving circuit and the control circuit, and a computer host electrically connected with the liquid crystal screen module and the control circuit respectively; wherein the content of the first and second substances,
the whole plane of the backlight module is divided into a plurality of sub-regions and numbered, each sub-region is electrically connected with the driving circuit through a corresponding first signal line, and the driving circuit is electrically connected with the control circuit through a second signal line corresponding to each first signal line;
when the display area of the liquid crystal display module is divided into a stimulation pattern display area and an arbitrary picture display area, the computer host is used for receiving the numbers of the sub-areas corresponding to the stimulation pattern display area and the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas, which are input by a user, sending the received numbers of the sub-areas and the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas to the control circuit, and sending the stimulation pattern designed by the computer host to the liquid crystal display module for display; the control circuit is used for synchronously controlling all the sub-regions of the backlight module through the driving circuit according to the received serial numbers of the sub-regions and the flashing frequency, the brightness information and the flashing waveform corresponding to each sub-region in the sub-regions, so that each sub-region corresponding to the stimulation pattern display region in the backlight module is in a flashing state, the stimulation pattern display region in the liquid crystal screen module displays flashing stimulation patterns, each sub-region corresponding to any picture display region in the backlight module is in a normally-on state, and any picture display region in the liquid crystal screen module displays any picture;
when the picture to be displayed by the liquid crystal screen module is any picture, the control circuit and the driving circuit synchronously control all the sub-areas of the backlight module to enable all the sub-areas of the backlight module to be in a normally-on state, and the liquid crystal screen module displays any picture.
In a possible implementation manner, in the above-mentioned liquid crystal display for SSVEP provided by the present invention, the control circuit is a field programmable gate array embedded processing chip.
In a possible implementation manner, in the liquid crystal display for SSVEP provided by the present invention, the field programmable gate array embedded processing chip is electrically connected to the computer host through a serial port, a bluetooth communication module, or a universal serial bus.
The invention also provides a stimulation pattern display method for the liquid crystal display of the SSVEP, which comprises the following steps:
s1: a user inputs the number of each subarea corresponding to the stimulation pattern to be displayed and the flicker frequency, the brightness information and the flicker waveform corresponding to each subarea in the computer host, and the computer host connected with the liquid crystal screen module is utilized to design the specific style of the stimulation pattern;
s2: the computer host sends the received serial numbers of the sub-areas, the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas to the control circuit, and sends the designed stimulation patterns to the liquid crystal screen module for display;
s3: the control circuit synchronously controls all the sub-regions of the backlight module through the driving circuit according to the received serial numbers of the sub-regions and the flashing frequency, the brightness information and the flashing waveform corresponding to each sub-region in the sub-regions, so that the sub-regions corresponding to the stimulation patterns to be displayed in the backlight module are in a flashing state, the regions corresponding to the sub-regions in the liquid crystal screen module display the flashing stimulation patterns, other sub-regions in the backlight module are in a normally-on state, and the regions corresponding to the other sub-regions in the liquid crystal screen module display any picture.
In a possible implementation manner, in the method for displaying a stimulation pattern provided by the present invention, in step S2, the computer host sends the received serial numbers of the sub-regions and the flashing frequency, the brightness information and the flashing waveform corresponding to each of the sub-regions to the control circuit, and specifically includes:
s20: the computer host sends the received serial numbers of the sub-areas, the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas to the control circuit through a serial port, a Bluetooth communication module or a universal serial bus.
In a possible implementation manner, in the above stimulation pattern display method provided by the present invention, in step S3, the control circuit synchronously controls all sub-regions of the backlight module through the driving circuit according to the received serial numbers of the sub-regions and the flashing frequency, the brightness information and the flashing waveform corresponding to each sub-region in the sub-regions, and specifically includes:
s30: the control circuit and the driving circuit adopt a pulse width modulation mode or a digital-to-analog conversion mode to realize the control of the flicker frequency, the brightness information and the flicker waveform.
The liquid crystal display for SSVEP and the stimulation pattern display method thereof provided by the invention divide the backlight module into a plurality of sub-areas as a whole, can independently control the flicker frequency, the brightness information and the flicker waveform of each sub-area in the backlight module through the control circuit and the drive circuit, when all the sub-areas of the backlight module do not flicker and maintain the normally bright state, the liquid crystal screen module can display any picture on the full screen, when the liquid crystal screen module is required to display the stimulation pattern in the appointed display area, the stimulation pattern can be set by utilizing a computer host connected with the liquid crystal screen module, and the setting of the stimulation parameters is realized by setting the flicker frequency, the brightness information and the flicker waveform of each sub-area corresponding to the stimulation pattern display area in the backlight module, so that the liquid crystal screen module can display the same flicker frequency, and the same flicker waveform of each sub-area in the corresponding, The stimulation patterns of the brightness information and the flicker waveform enable the liquid crystal screen module to display any picture in any picture display area by setting each sub-area corresponding to any picture display area in the backlight module to be in a normally-on state, so that the liquid crystal display can display any picture in a full screen manner like a conventional liquid crystal display, and can also display the stimulation patterns in the stimulation pattern display area and any picture in any picture display area, and the stimulation pattern display area and any picture display area are not influenced by each other. The invention uses the backlight module to replace the prior liquid crystal display module to realize the flicker by converting each frame, so that the flicker frequency, the brightness information and the flicker waveform of the stimulation pattern in the stimulation pattern display area can be modified by setting the flicker frequency, the brightness information and the flicker waveform of the sub-area of the backlight module at the corresponding position, thereby the flicker frequency of the stimulation pattern is not limited by the screen refresh rate, the stimulation pattern with any flicker waveform can be displayed, and the signal transmission path of the liquid crystal display module and a computer host is not changed, therefore, the picture needing to be displayed on the screen of the liquid crystal display module can be set according to the same method as the conventional liquid crystal display, and the setting is not needed by using other special tools, thus the invention is simple and easy to use.
Drawings
FIG. 1 is a schematic structural diagram of a liquid crystal display for SSVEP according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a portion of a liquid crystal display for SSVEP according to an embodiment of the present invention;
FIG. 3 is a second schematic diagram of a portion of an LCD for SSVEP according to an embodiment of the present invention;
FIG. 4 is a flowchart of a method for displaying stimulation patterns of an SSVEP LCD according to an embodiment of the present invention;
FIG. 5 is a second flowchart of a method for displaying stimulation patterns of an SSVEP LCD according to an embodiment of the present invention;
fig. 6 is a third flowchart of a method for displaying stimulation patterns of an SSVEP lcd according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only illustrative and are not intended to limit the present application.
An embodiment of the present invention provides a liquid crystal display for SSVEP, as shown in fig. 1, including: the liquid crystal display device comprises a liquid crystal screen module 1, a backlight module 2 for providing backlight for the liquid crystal screen module 1, a driving circuit 3 electrically connected with the backlight module 2, a control circuit 4 electrically connected with the driving circuit 3, a power supply circuit 5 for supplying power to the liquid crystal screen module 1, the backlight module 2, the driving circuit 3 and the control circuit 4, and a computer host 6 respectively electrically connected with the liquid crystal screen module 1 and the control circuit 4; wherein the content of the first and second substances,
as shown in fig. 2, the whole plane of the backlight module 2 is divided into a plurality of sub-regions 7 and numbered, each sub-region 7 is electrically connected to the driving circuit 3 through a corresponding first signal line 8, and the driving circuit 3 is electrically connected to the control circuit 4 through a second signal line 9 corresponding to each first signal line 8; fig. 2 illustrates an example in which the entire plane of the backlight module 2 is divided into ten sub-regions, the ten sub-regions correspond to ten first signal lines 8 one by one, the ten first signal lines correspond to ten second signal lines 9 one by one, and the control circuit 4 and the driving circuit 3 individually control the sub-regions 7 through the first signal lines 8 and the second signal lines 9 corresponding to each sub-region 7;
as shown in fig. 3 (the arrow in fig. 3 indicates the backlight direction), when the display area of the lcd module 1 is divided into a stimulation pattern display area 10 and an arbitrary screen display area 11, the computer host 6, for receiving the numbers of the sub-regions corresponding to the stimulus pattern display region 10 (corresponding to the numbers:. c. to r. shown in fig. 2) and the blinking frequencies (f 1 to f5 shown in fig. 3), luminance information, and blinking waveforms (arbitrary waveforms such as square waves, triangular waves, sine waves, sawtooth waves, etc.) corresponding to the respective sub-regions, which are inputted by the user, transmitting the received numbers of the respective sub-regions and the blinking frequencies, luminance information, and blinking waveforms corresponding to the respective sub-regions to the control circuit 4, sending the stimulation pattern designed by the user by using the computer host 6 to the liquid crystal screen module 1 for displaying; the control circuit 4 is used for synchronously controlling all the sub-regions of the backlight module 2 through the driving circuit 3 according to the received serial numbers of the sub-regions and the flashing frequency, the brightness information and the flashing waveform corresponding to each sub-region in the sub-regions, so that each sub-region corresponding to the stimulation pattern display region 10 in the backlight module 2 is in a flashing state, the stimulation pattern display region 10 in the liquid crystal screen module 1 displays a flashing stimulation pattern, each sub-region corresponding to any picture display region 11 in the backlight module 2 is in a normally-on state, and any picture display region 11 in the liquid crystal screen module 1 displays any picture;
when the to-be-displayed picture of the liquid crystal display module 1 is an arbitrary picture, the control circuit 4 and the driving circuit 3 synchronously control all the sub-regions of the backlight module 2 to make all the sub-regions of the backlight module 2 in a normally-on state, and the liquid crystal display module 1 displays the arbitrary picture in full screen, which is similar to a conventional liquid crystal display and is not repeated herein.
The liquid crystal display for SSVEP provided by the embodiment of the invention divides the backlight module into a plurality of sub-regions, can individually control the flicker frequency, the luminance information and the flicker waveform of each sub-region in the backlight module through the control circuit and the driving circuit, when all the sub-regions of the backlight module do not flicker and maintain the normally bright state, the liquid crystal screen module can display any picture on the full screen, when the liquid crystal screen module is required to display the stimulation pattern in the designated display region, the stimulation pattern can be set by using the computer host connected with the liquid crystal screen module, and the setting of the stimulation parameters is realized by setting the flicker frequency, the luminance information and the flicker waveform of each sub-region corresponding to the stimulation pattern display region in the backlight module, so that the liquid crystal screen module displays the stimulation pattern display region having the same flicker frequency as each sub-region in the corresponding backlight module, The stimulation patterns of the brightness information and the flicker waveform enable the liquid crystal screen module to display any picture in any picture display area by setting each sub-area corresponding to any picture display area in the backlight module to be in a normally-on state, so that the liquid crystal display can display any picture in a full screen manner like a conventional liquid crystal display, and can also display the stimulation patterns in the stimulation pattern display area and any picture in any picture display area, and the stimulation pattern display area and any picture display area are not influenced by each other. The invention uses the backlight module to replace the prior liquid crystal display module to realize the flicker by converting each frame, so that the flicker frequency, the brightness information and the flicker waveform of the stimulation pattern in the stimulation pattern display area can be modified by setting the flicker frequency, the brightness information and the flicker waveform of the sub-area of the backlight module at the corresponding position, thereby the flicker frequency of the stimulation pattern is not limited by the screen refresh rate, the stimulation pattern with any flicker waveform can be displayed, and the signal transmission path of the liquid crystal display module and a computer host is not changed, therefore, the picture needing to be displayed on the screen of the liquid crystal display module can be set according to the same method as the conventional liquid crystal display, and the setting is not needed by using other special tools, thus the invention is simple and easy to use.
It should be noted that, in the liquid crystal display for SSVEP provided in the embodiment of the present invention, the number of sub-regions divided by the backlight module and the arrangement manner of each sub-region are not required to be fixed, and may be set according to the application scenario and the actual requirements of the SSVEP brain-computer interface. Fig. 3 illustrates an example in which a line at the bottom of the lcd panel module is used as a stimulation pattern display area, and an area above the stimulation pattern display area is used as an arbitrary screen display area, an image of the stimulation pattern display area may be drawn by computer software, the stimulation pattern display area corresponds to 5 sub-areas in the backlight module, the flashing frequencies of the 5 sub-areas are f 1-f 5, and the flashing frequencies, luminance information, and flashing waveforms of the 5 sub-areas are synchronously controlled by the driving circuit and the control circuit. After the backlight module irradiates the corresponding area of the liquid crystal screen module, an observer can observe the stimulation target flickering at different frequencies in the stimulation pattern display area of the liquid crystal screen module, and observe any pictures such as videos, pictures, characters and the like in any picture display area of the liquid crystal screen module without being influenced by the stimulation pattern display area below.
In a specific implementation, in the above-mentioned liquid crystal display for SSVEP provided in the embodiment of the present invention, the control circuit may be a Field Programmable Gate Array (FPGA) embedded processing chip. Of course, the control circuit is not limited to the structure of the FPGA embedded processing chip, and may also be another control circuit capable of independently controlling each sub-region in the backlight module, which is not limited herein.
In specific implementation, in the liquid crystal display for SSVEP provided in the embodiment of the present invention, the FPGA embedded processing chip may communicate with the host computer through a Serial port (wired connection), a bluetooth communication module (wireless connection), or a Universal Serial Bus (USB), and the flash frequency, luminance information, and flash waveform of any sub-region of the backlight module are configured through the host computer, which may be implemented without modifying an internal program of the FPGA embedded processing chip.
It should be noted that the liquid crystal display for SSVEP provided in the embodiment of the present invention may be applied to a liquid crystal display having a direct-type backlight module, specifically, as shown in fig. 2, each light source in each sub-region 7 is electrically connected to the driving circuit 3 through the corresponding first signal line 8, so as to realize independent control of each sub-region 7; or, the backlight module can also be applied to a liquid crystal display with a side-in backlight module, specifically, a light guide plate in the backlight module is divided into a plurality of sub-regions, each sub-region is correspondingly provided with a light source, light emitted by each light source uniformly irradiates the liquid crystal screen module through the light guide plate corresponding to the sub-region, and the light source corresponding to each sub-region is electrically connected with a driving circuit through a corresponding first signal line to realize independent control of each sub-region; and are not limited herein.
Based on the same inventive concept, an embodiment of the present invention further provides a method for displaying a stimulation pattern of a liquid crystal display for SSVEP, as shown in fig. 4, including the following steps:
s1: the user inputs the number of each subarea corresponding to the stimulation pattern display area and the flicker frequency, the brightness information and the flicker waveform corresponding to each subarea in the computer host, and the computer host connected with the liquid crystal screen module is utilized to design the specific style of the stimulation pattern;
s2: the computer host sends the received serial numbers of the sub-areas, the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas to the control circuit, and sends the designed stimulation patterns to the liquid crystal screen module for display;
s3: the control circuit synchronously controls all the sub-regions of the backlight module through the driving circuit according to the received serial numbers of the sub-regions and the flashing frequency, the brightness information and the flashing waveform corresponding to each sub-region in the sub-regions, so that the sub-regions corresponding to the stimulation pattern display region in the backlight module are in a flashing state, the stimulation pattern display region in the liquid crystal screen module displays flashing stimulation patterns, the sub-regions corresponding to any picture display region in the backlight module are in a normally-on state, and any picture display region in the liquid crystal screen module displays any picture.
The stimulation pattern display method provided by the embodiment of the invention can display any picture on the full screen of the liquid crystal screen module when all the sub-regions of the backlight module do not flicker and maintain the normally-on state, can set the stimulation pattern by using the computer host connected with the liquid crystal screen module when the liquid crystal screen module is required to display the stimulation pattern in the designated display region, realizes the setting of the stimulation parameters by setting the flicker frequency, the brightness information and the flicker waveform of each sub-region in the backlight module corresponding to the stimulation pattern display region, enables the liquid crystal screen module to display the stimulation pattern with the same flicker frequency, the same brightness information and the same flicker waveform as each sub-region in the corresponding backlight module in the stimulation pattern display region, enables the liquid crystal screen module to display any picture in any picture display region by setting each sub-region in the backlight module corresponding to the normally-on state, therefore, the liquid crystal display can display any picture on the full screen like a conventional liquid crystal display, and the liquid crystal display module can display the stimulation pattern in the stimulation pattern display area and display any picture in the any picture display area, and the stimulation pattern display area and the any picture display area are not influenced by each other. The invention utilizes the backlight module to flicker instead of the prior liquid crystal display module to realize flicker by converting each frame, so that the flicker frequency, the brightness information and the flicker waveform of the stimulation pattern in the stimulation pattern display area can be modified by setting the flicker frequency, the brightness information and the flicker waveform of the neutron area in the backlight module at the corresponding position, thereby ensuring that the flicker frequency of the stimulation pattern is not limited by the screen refresh rate and the stimulation pattern with any flicker waveform can be displayed.
In specific implementation, when the computer host sends the received serial numbers of the sub-regions, and the flashing frequency, the brightness information and the flashing waveform corresponding to each sub-region in the sub-regions to the control circuit and sends the designed stimulation pattern to the liquid crystal display module for displaying, as shown in fig. 5, in step S2 of the method for displaying stimulation patterns provided by the embodiment of the present invention, the method can be specifically implemented in the following manner:
s20: the computer host sends the received serial numbers of the sub-areas, the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas to the control circuit through the serial port, the Bluetooth communication module or the universal serial bus, and sends the designed stimulation patterns to the liquid crystal screen module for displaying; therefore, the flicker frequency, the brightness information and the flicker waveform of any subarea of the backlight module can be configured through the computer host, and the method can be realized without modifying the internal program of the FPGA embedded processing chip. Specifically, the computer host can send the designed stimulation pattern to the liquid crystal screen module for display in a VGA or HDMI mode.
In specific implementation, in step S3 of the method for displaying a stimulation pattern provided by the embodiment of the present invention, the control circuit synchronously controls all sub-regions of the backlight module through the driving circuit according to the received serial numbers of the sub-regions and the flashing frequency, the brightness information, and the flashing waveform corresponding to each sub-region in the sub-regions, so that each sub-region in the backlight module corresponding to the stimulation pattern display region is in a flashing state, the stimulation pattern display region in the liquid crystal display module displays a flashing stimulation pattern, each sub-region in the backlight module corresponding to an arbitrary screen display region is in a normally-on state, and when an arbitrary screen display region in the liquid crystal display module displays an arbitrary screen, as shown in fig. 6, the method can be specifically implemented in the following manner:
s30: the control circuit and the drive circuit adopt a pulse width modulation mode or a digital-to-analog conversion mode to realize the control of the flicker frequency, the brightness information and the flicker waveform, so that each sub-area corresponding to the stimulation pattern display area in the backlight module is in a flicker state, the stimulation pattern display area in the liquid crystal screen module displays the flickering stimulation pattern, each sub-area corresponding to any picture display area in the backlight module is in a normally-on state, and any picture display area in the liquid crystal screen module displays any picture.
The liquid crystal display for SSVEP and the stimulation pattern display method thereof provided by the embodiment of the invention have the advantages that the backlight module is integrally divided into a plurality of sub-areas, the flicker frequency, the brightness information and the flicker waveform of each sub-area in the backlight module can be independently controlled through the control circuit and the driving circuit, when all the sub-areas of the backlight module do not flicker and maintain a normally bright state, the liquid crystal screen module can display any picture on the full screen, when the liquid crystal screen module is required to display the stimulation pattern in a designated display area, the stimulation pattern can be set through the computer host connected with the liquid crystal screen module, the stimulation parameters are set through setting the flicker frequency, the brightness information and the flicker waveform of each sub-area corresponding to the stimulation pattern display area in the backlight module, so that the liquid crystal screen module has the same flicker frequency, the same flicker frequency as each sub-area in the corresponding backlight module in the stimulation pattern display area, and the stimulation, The stimulation patterns of the brightness information and the flicker waveform enable the liquid crystal screen module to display any picture in any picture display area by setting each sub-area corresponding to any picture display area in the backlight module to be in a normally-on state, so that the liquid crystal display can display any picture in a full screen manner like a conventional liquid crystal display, and can also display the stimulation patterns in the stimulation pattern display area and any picture in any picture display area, and the stimulation pattern display area and any picture display area are not influenced by each other. The invention uses the backlight module to replace the prior liquid crystal display module to realize the flicker by converting each frame, so that the flicker frequency, the brightness information and the flicker waveform of the stimulation pattern in the stimulation pattern display area can be modified by setting the flicker frequency, the brightness information and the flicker waveform of the sub-area of the backlight module at the corresponding position, thereby the flicker frequency of the stimulation pattern is not limited by the screen refresh rate, the stimulation pattern with any flicker waveform can be displayed, and the signal transmission path of the liquid crystal display module and a computer host is not changed, therefore, the picture needing to be displayed on the screen of the liquid crystal display module can be set according to the same method as the conventional liquid crystal display, and the setting is not needed by using other special tools, thus the invention is simple and easy to use.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A liquid crystal display for SSVEP, comprising: the liquid crystal display device comprises a liquid crystal screen module, a backlight module for providing backlight for the liquid crystal screen module, a driving circuit electrically connected with the backlight module, a control circuit electrically connected with the driving circuit, a power supply circuit for supplying power to the liquid crystal screen module, the backlight module, the driving circuit and the control circuit, and a computer host electrically connected with the liquid crystal screen module and the control circuit respectively; wherein the content of the first and second substances,
the whole plane of the backlight module is divided into a plurality of sub-regions and numbered, each sub-region is electrically connected with the driving circuit through a corresponding first signal line, and the driving circuit is electrically connected with the control circuit through a second signal line corresponding to each first signal line; the control circuit and the driving circuit individually control each sub-region through a first signal line and a second signal line corresponding to the sub-region;
when the display area of the liquid crystal display module is divided into a stimulation pattern display area and an arbitrary picture display area, the computer host is used for receiving the numbers of the sub-areas corresponding to the stimulation pattern display area and the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas, which are input by a user, sending the received numbers of the sub-areas and the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas to the control circuit, and sending the stimulation pattern designed by the computer host to the liquid crystal display module for display; the control circuit is used for independently controlling the flicker frequency, the brightness information and the flicker waveform of each sub-region in the backlight module through the driving circuit according to the received serial number of each sub-region and the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-region in each sub-region, and synchronously controlling all the sub-regions of the backlight module to enable each sub-region corresponding to a stimulation pattern display region in the backlight module to be in a flicker state, the stimulation pattern display region in the liquid crystal screen module displays a flickering stimulation pattern, each sub-region corresponding to any picture display region in the backlight module is in a normally-on state, and any picture display region in the liquid crystal screen module displays any picture;
when the picture to be displayed by the liquid crystal screen module is any picture, the control circuit and the driving circuit synchronously control all the sub-areas of the backlight module to enable all the sub-areas of the backlight module to be in a normally-on state, and the liquid crystal screen module displays any picture.
2. The liquid crystal display for SSVEP of claim 1, wherein the control circuit is a field programmable gate array embedded processing chip.
3. The liquid crystal display for SSVEP of claim 2, wherein the field programmable gate array embedded processing chip is electrically connected to the computer host through a serial port, a bluetooth communication module, or a universal serial bus.
4. A method for displaying stimulation patterns for a liquid crystal display of SSVEP according to any of claims 1-3, characterized in that it comprises the following steps:
s1: a user inputs the number of each subarea corresponding to the stimulation pattern to be displayed and the flicker frequency, the brightness information and the flicker waveform corresponding to each subarea in the computer host, and the computer host connected with the liquid crystal screen module is utilized to design the specific style of the stimulation pattern;
s2: the computer host sends the received serial numbers of the sub-areas, the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas to the control circuit, and sends the designed stimulation patterns to the liquid crystal screen module for display;
s3: the control circuit controls the flashing frequency, the brightness information and the flashing waveform of each sub-region in the backlight module independently through the driving circuit according to the received serial number of each sub-region and the flashing frequency, the brightness information and the flashing waveform corresponding to each sub-region in each sub-region, and synchronously controls all the sub-regions of the backlight module, so that each sub-region corresponding to a stimulation pattern to be displayed in the backlight module is in a flashing state, the region corresponding to each sub-region in the liquid crystal screen module displays the flashing stimulation pattern, other sub-regions in the backlight module are in a normally-on state, and the regions corresponding to the other sub-regions in the liquid crystal screen module display any picture.
5. The method as claimed in claim 4, wherein in step S2, the computer host sends the received number of each sub-region and the flashing frequency, brightness information and flashing waveform corresponding to each sub-region in the sub-regions to the control circuit, and specifically comprises:
s20: the computer host sends the received serial numbers of the sub-areas, the flicker frequency, the brightness information and the flicker waveform corresponding to each sub-area in the sub-areas to the control circuit through a serial port, a Bluetooth communication module or a universal serial bus.
6. The method as claimed in claim 4 or 5, wherein in step S3, the control circuit synchronously controls all sub-regions of the backlight module via the driving circuit according to the received number of each sub-region and the flashing frequency, brightness information and flashing waveform corresponding to each sub-region of the sub-regions, specifically comprising:
s30: the control circuit and the driving circuit adopt a pulse width modulation mode or a digital-to-analog conversion mode to realize the control of the flicker frequency, the brightness information and the flicker waveform.
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