CN110379376A - A kind of liquid crystal display and its stimulus patterns display methods for SSVEP - Google Patents
A kind of liquid crystal display and its stimulus patterns display methods for SSVEP Download PDFInfo
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- CN110379376A CN110379376A CN201910599671.7A CN201910599671A CN110379376A CN 110379376 A CN110379376 A CN 110379376A CN 201910599671 A CN201910599671 A CN 201910599671A CN 110379376 A CN110379376 A CN 110379376A
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- G—PHYSICS
- 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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- 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
- G09G3/34—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
- G09G3/3406—Control of illumination source
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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
- G09G3/34—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
Abstract
The invention discloses a kind of liquid crystal display for SSVEP and its stimulus patterns display methods, backlight module is integrally divided into several sub-regions, the flicker frequency of each subregion in backlight module, luminance information and flashing waveform are individually controlled by control circuit and driving circuit, make liquid crystal display that can both be displayed in full screen any picture, stimulus patterns being shown in stimulus patterns display area again, showing any picture in any active area, stimulus patterns display area is independent of each other with any active area.The present invention replaces existing convert using each frame of liquid crystal display mould group to realize flashing using backlight module flashing, modify flicker frequency, luminance information and the flashing waveform of stimulus patterns by the flicker frequency of subregion, luminance information and flashing waveform in setting backlight module, so as to so that stimulus patterns flicker frequency is not limited by screen refresh rate, and it can show the stimulus patterns with any flashing waveform.
Description
Technical field
The present invention relates to brain-computer interface and technical field of liquid crystal display more particularly to a kind of liquid crystal displays for SSVEP
Device and its stimulus patterns display methods.
Background technique
Steady State Visual Evoked Potential (Steady-state visual evoked potentials, SSVEP) brain-computer interface
User is needed to watch the image or light of the fixation flicker frequency of visual stimulator offer attentively.It is connect currently, being used as SSVEP brain machine
The display device of the visual stimulator of mouth mainly includes liquid crystal display (liquid-crystal display, LCD) and shines
Diode (light-emitting diode, LED) is these two types of.
Using LCD display as visual stimulator, the backlight module of LCD display is to be always on state, and user can root
According to the refresh rate of LCD display, is programmed by host computer and determine each frame of LCD display pattern to be shown, needed for generation
The blinker pattern for the certain frequency wanted is as SSVEP stimulus patterns.Since LCD display can be by computer program neatly
Design frequency, shape, color, layout and the inverted pattern in induction source, therefore, the visual stimulus of most of brain machine interface systems
Device uses LCD display for carrier.However, the frequency of stimulation precision that LCD display can be generated is lower, and induce source can
Select frequency of stimulation no more than the half of the refresh rate of LCD display, the visual stimulus quantity that can be presented is relatively limited, can not
Show the flashing waveform such as square wave, sine wave, triangular wave of optional frequency.
Institute can produce by being independently controlled to each LED light source as visual stimulator using LED light source
The brightness that needs, flicker frequency and include that sine wave, square wave, sawtooth wave, triangular wave etc. flash waveform, there is no LCD display
Existing refresh rate limitation, however, user can not quickly change stimulus patterns by the simple human-computer interaction interface of computer end
The stimulation parameter closely related with SSVEP such as shape, color, size is repaired furthermore, it is desirable to carry out program in embeded processor
Changing just can control each induction source and generates corresponding brightness, flicker frequency and flashing waveform, using with equipment making cost compared with
It is high.
To sum up, the visual stimulator using common LCD display and LED light source as SSVEP brain-computer interface, Wu Fatong
When meet user stimulation interface quickly design by software and obtains the stimulation of any flicker frequency and any flashing waveform and believe
Number demand.
Summary of the invention
In view of this, being used the present invention provides a kind of liquid crystal display for SSVEP and its stimulus patterns display methods
The stimulation letter of stimulation interface and any flicker frequency of acquisition and any flashing waveform is quickly designed to meet user by software
Number demand.
Therefore, the present invention provides a kind of liquid crystal displays for SSVEP characterized by comprising liquid crystal display mould
Group provides the backlight module of backlight for the liquid crystal display mould group, the driving circuit being electrically connected with the backlight module, and described
The control circuit that driving circuit is electrically connected is the liquid crystal display mould group, the backlight module, the driving circuit and the control
The power circuit of circuit power supply processed, and the computer master being electrically connected respectively with the liquid crystal display mould group and the control circuit
Machine；Wherein,
The entire plane of the backlight module is divided into several subregions and numbers, and each subregion passes through correspondence
The first signal wire and the driving circuit be electrically connected, the driving circuit passes through corresponding with the first signal wire described in every
Second signal line and the control circuit are electrically connected；
When the display area of the liquid crystal display mould group is divided into stimulus patterns display area and any active area, institute
State host computer, for receive the number of all subregion corresponding with stimulus patterns display area of user's input and with this it is each
The corresponding flicker frequency of each subregion, luminance information and flashing waveform in subregion, by the number of received all subregion
And flicker frequency corresponding with each subregion in all subregion, luminance information and flashing waveform are sent to the control
Circuit, and user is sent to the liquid crystal display mould group using the stimulus patterns that the host computer designs and is shown；It is described
Control circuit, number and flashing corresponding with each subregion in all subregion for all subregion based on the received
Frequency, luminance information and flashing waveform, synchronize control by all subregions of the driving circuit to the backlight module
System, makes all subregion flashing state corresponding with stimulus patterns display area, the liquid crystal display mould group in the backlight module
In the display flashing of stimulus patterns display area stimulus patterns, it is corresponding with any active area in the backlight module
All subregion is to be always on state, and any active area in the liquid crystal display mould group shows any picture；
When liquid crystal display mould group picture to be shown is any picture, the control circuit and the driving circuit pair
All subregions of the backlight module synchronize control, and all subregions of the backlight module is made to be always on state, described
Any picture of liquid crystal display module displays.
In one possible implementation, described in the above-mentioned liquid crystal display for SSVEP provided by the invention
Control circuit is field programmable gate array embedded processing chip.
In one possible implementation, described in the above-mentioned liquid crystal display for SSVEP provided by the invention
Field programmable gate array embedded processing chip passes through serial ports or bluetooth communication module or universal serial bus and the computer
Host is electrically connected.
The present invention also provides a kind of stimulus patterns display methods of liquid crystal display for SSVEP, including walk as follows
It is rapid:
S1: user inputs the number of all subregion corresponding with stimulus patterns to be shown and each with this in host computer
The corresponding flicker frequency of each subregion, luminance information and flashing waveform in subregion, and utilize and be connected with liquid crystal display mould group
Host computer design stimulus patterns specific pattern；
S2: host computer is by the number of received all subregion and corresponding with each subregion in all subregion
Flicker frequency, luminance information and flashing waveform are sent to control circuit, and the stimulus patterns of design are sent to liquid crystal display mould group
It is shown；
S3: the control circuit number of all subregion and corresponding with each subregion in all subregion based on the received
Flicker frequency, luminance information and flashing waveform, synchronize control by all subregions of the driving circuit to backlight module,
Make all subregion flashing state corresponding with stimulus patterns to be shown in backlight module, in liquid crystal display mould group with all subregion
The stimulus patterns of corresponding region display flashing, other subregions are the state that is always in backlight module, in liquid crystal display mould group with should
The corresponding region of other subregions shows any picture.
In one possible implementation, in above-mentioned stimulus patterns display methods provided by the invention, step S2, electricity
Brain server is by the number of received all subregion and flicker frequency corresponding with each subregion in all subregion, brightness
Information and flashing waveform are sent to control circuit, specifically include:
S20: host computer passes through serial ports or bluetooth communication module or universal serial bus for the volume of received all subregion
Number and flicker frequency corresponding with each subregion in all subregion, luminance information and flashing waveform be sent to control electricity
Road.
In one possible implementation, in above-mentioned stimulus patterns display methods provided by the invention, step S3, control
The circuit processed number of all subregion and flicker frequency corresponding with each subregion in all subregion, bright based on the received
Information and flashing waveform are spent, control is synchronized by all subregions of the driving circuit to backlight module, specifically includes:
S30: control circuit and driving circuit are realized using pulse width modulation or digital-to-analogue conversion mode and flash frequency
Rate, luminance information and the control for flashing waveform.
Above-mentioned liquid crystal display and its stimulus patterns display methods for SSVEP provided by the invention, by backlight module
Entirety is divided into several sub-regions, can be to the sudden strain of a muscle of each subregion in backlight module by control circuit and driving circuit
Bright frequency, luminance information and flashing waveform are individually controlled, when whole subregions of backlight module do not flash and remain normal
When bright state, liquid crystal display mould group can be displayed in full screen any picture, pierce when needing liquid crystal display mould group to show in specified display area
Swash pattern when, can use be connected with liquid crystal display mould group host computer setting stimulus patterns, by setting backlight module in and
Flicker frequency, luminance information and the flashing waveform of the corresponding all subregion in stimulus patterns display area realize setting for stimulation parameter
It sets, shows that liquid crystal display mould group and the sudden strain of a muscle having the same of all subregion in corresponding backlight module in stimulus patterns display area
Bright frequency, luminance information and the stimulus patterns for flashing waveform, by corresponding with any active area in setting backlight module
All subregion be always on state, so that liquid crystal display mould group is shown any picture in any active area, in this way, can both make
Liquid crystal display is displayed in full screen any picture as conventional LCD device, and liquid crystal display mould group can be made aobvious in stimulus patterns
Show that region shows stimulus patterns and show any picture in any active area, and stimulus patterns display area with times
Meaning active area is independent of each other.The present invention is become using backlight module flashing replacement is existing using each frame of liquid crystal display mould group
Realization flashing is changed, so that the flicker frequency of the stimulus patterns in stimulus patterns display area, luminance information and flashing waveform can be with
The flicker frequency of subregion, luminance information and flashing waveform are modified in backlight module by the way that corresponding position is arranged, thus
Stimulus patterns flicker frequency can be made not limited by screen refresh rate, and can show the stimulation figure with any flashing waveform
Case, also, due to do not have change liquid crystal display mould group and host computer signal transmission pathway, can according to conventional liquid
Picture to be shown is needed in the identical method setting liquid crystal display mould stack screen of crystal display, is carried out without using other specific purpose tools
Setting, it is easy to use.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the liquid crystal display provided in an embodiment of the present invention for SSVEP；
Fig. 2 is one of the partial structure diagram of liquid crystal display provided in an embodiment of the present invention for SSVEP；
Fig. 3 is the two of the partial structure diagram of the liquid crystal display provided in an embodiment of the present invention for SSVEP；
Fig. 4 is the process of the stimulus patterns display methods of the liquid crystal display provided in an embodiment of the present invention for SSVEP
One of figure；
Fig. 5 is the process of the stimulus patterns display methods of the liquid crystal display provided in an embodiment of the present invention for SSVEP
The two of figure；
Fig. 6 is the process of the stimulus patterns display methods of the liquid crystal display provided in an embodiment of the present invention for SSVEP
The three of figure.
Specific embodiment
Below in conjunction with the attached drawing in the application embodiment, the technical solution in the application embodiment is carried out clear
Chu, complete description, it is clear that described embodiment is merely possible to illustrate, and is not intended to limit the application.
A kind of liquid crystal display for SSVEP provided in an embodiment of the present invention, as shown in Figure 1, comprising: liquid crystal display mould group
1, the backlight module 2 of backlight is provided for liquid crystal display mould group 1, the driving circuit 3 being electrically connected with backlight module 2, with driving circuit 3
The control circuit 4 of electric connection is the power supply electricity that liquid crystal display mould group 1, backlight module 2, driving circuit 3 and control circuit 4 are powered
Road 5, and the host computer 6 being electrically connected respectively with liquid crystal display mould group 1 and control circuit 4；Wherein,
As shown in Fig. 2, the entire plane of backlight module 2 is divided into several subregions 7 and numbers, each subregion 7 is logical
It crosses corresponding first signal wire 8 to be electrically connected with driving circuit 3, driving circuit 3 passes through corresponding with every first signal wire 8 the
Binary signal line 9 and control circuit 4 are electrically connected；Fig. 2 by taking the entire plane of backlight module 2 is divided into ten sub-regions as an example into
Row explanation, ten sub-regions are corresponded with ten the first signal wires 8, ten the first signal wires and ten second signal lines 9 one
One is corresponding, and control circuit 4 and driving circuit 3 are right by first signal wire 8 corresponding with each subregion 7 and second signal line 9
The subregion 7 is individually controlled；
(arrow in Fig. 3 indicates backlight illumination direction) as shown in Figure 3, when the display area of liquid crystal display mould group 1 is divided into thorn
When swashing pattern displaying region 10 and any active area 11, host computer 6, for receiving user inputs and stimulus patterns
The number (corresponding number as shown in Figure 2 6.~10.) of the corresponding all subregion in display area 10 and in all subregion
The corresponding flicker frequency of each subregion (f1~f5 as shown in Figure 3), luminance information and flashing waveform (such as square wave, triangular wave,
The random waveforms such as sine wave, sawtooth wave), by the number of received all subregion and with each subregion in all subregion
Corresponding flicker frequency, luminance information and flashing waveform are sent to control circuit 4, and user is designed using host computer 6
Stimulus patterns are sent to liquid crystal display mould group 1 and are shown；Control circuit 4, for all subregion based on the received number and
Flicker frequency corresponding with each subregion in all subregion, luminance information and flashing waveform, are carried on the back by 3 Duis of driving circuit
All subregions of optical mode group 2 synchronize control, make each sub-district corresponding with stimulus patterns display area 10 in backlight module 2
Domain is flashing state, the stimulus patterns of the display flashing of stimulus patterns display area 10 in liquid crystal display mould group 1, in backlight module 2
All subregion corresponding with any active area 11 is to be always on state, any active area in liquid crystal display mould group 1
The 11 any pictures of display；
When liquid crystal display mould group 1 picture to be shown is any picture, control circuit 4 and driving circuit 3 are to backlight module 2
All subregions synchronize control, so that all subregions of backlight module 2 is always on state, liquid crystal display mould group 1 is displayed in full screen
Any picture, similar with conventional LCD device, this will not be repeated here.
The above-mentioned liquid crystal display for SSVEP provided in an embodiment of the present invention, backlight module is integrally divided into several
Sub-regions, by control circuit and driving circuit can flicker frequency to each subregion in backlight module, brightness believe
Breath and flashing waveform are individually controlled, when whole subregions of backlight module do not flash and maintain to be always on state, liquid crystal
Screen mould group can be displayed in full screen any picture, can be with when needing liquid crystal display mould group in specified display area display stimulus patterns
Stimulus patterns are set using the host computer being connected with liquid crystal display mould group, by being arranged in backlight module and stimulus patterns viewing area
Flicker frequency, luminance information and the flashing waveform of the corresponding all subregion in domain realize the setting of stimulation parameter, make liquid crystal display mould group
It is shown and the flicker frequency having the same of all subregion in corresponding backlight module, luminance information in stimulus patterns display area
It is to be always on by all subregion corresponding with any active area in setting backlight module with the stimulus patterns of flashing waveform
State makes liquid crystal display mould group show any picture in any active area, in this way, can both make liquid crystal display picture conventional
Liquid crystal display is equally displayed in full screen any picture, and liquid crystal display mould group can be made to show stimulation figure in stimulus patterns display area
Case and any picture is shown in any active area, and stimulus patterns display area and any active area are mutual
It does not influence.The present invention replaces existing convert using each frame of liquid crystal display mould group to realize flashing using backlight module flashing, so that
Flicker frequency, luminance information and the flashing waveform of stimulus patterns in stimulus patterns display area can be by being arranged corresponding position
Backlight module in the flicker frequency of subregion, luminance information and flashing waveform modified, so as to so that stimulus patterns are dodged
Bright frequency is not limited by screen refresh rate, and can show the stimulus patterns with any flashing waveform, also, due to not having
The signal transmission pathway for changing liquid crystal display mould group and host computer therefore can be according to side identical with conventional LCD device
Picture to be shown is needed in method setting liquid crystal display mould stack screen, is configured without using other specific purpose tools, it is easy to use.
It should be noted that in the above-mentioned liquid crystal display for SSVEP provided in an embodiment of the present invention, backlight module
The requirement that the quantity of the subregion of division and the arrangement mode of all subregion are not fixed, can be according to SSVEP brain-computer interface
Application scenarios, actual demand is configured.Fig. 3 using liquid crystal display mould group bottom a line as stimulus patterns display area, should
Region above stimulus patterns display area is to be illustrated for any active area, the stimulus patterns display area
Image can be drawn by computer software, which corresponds to 5 sub-regions in backlight module, this 5
The flicker frequency of sub-regions is respectively f1~f5, and flicker frequency, luminance information and the flashing waveform of this 5 sub-regions are by driving
Circuit and control circuit synchronize controlled.After backlight module is irradiated to the corresponding region of liquid crystal display mould group, observer
The stimulation target flashed with different frequency is observed with the stimulus patterns display area in liquid crystal display mould group, in liquid crystal display mould group
Observe any picture such as video, picture, text without the shadow by lower section stimulus patterns display area in any active area
It rings.
In the specific implementation, in the above-mentioned liquid crystal display for SSVEP provided in an embodiment of the present invention, control circuit
It can be field programmable gate array (FPGA) embedded processing chip.Certainly, it is embedded to be not limited to FPGA for control circuit
A kind of this structure of chip is handled, can also be that can be realized other controls individually controlled all subregion in backlight module
Circuit processed, it is not limited here.
In the specific implementation, in the above-mentioned liquid crystal display for SSVEP provided in an embodiment of the present invention, FPGA insertion
Formula handles chip can be total by serial ports (wired connection mode) or bluetooth communication module (radio connection) or general serial
Line (Universal Serial Bus, USB) is communicated with host computer, by host computer to the anyon of backlight module
The flicker frequency in region, luminance information and flashing waveform are configured, without to FPGA embedded processing chip interior program into
Row modification can be realized.
It should be noted that the above-mentioned liquid crystal display for SSVEP provided in an embodiment of the present invention, can be adapted for having
Have the liquid crystal display of down straight aphototropism mode set, specifically, as shown in Fig. 2, each light source in each subregion 7 pass through it is corresponding
First signal wire 8 is electrically connected with driving circuit 3, realizes the independent control to each subregion 7；Alternatively, being readily applicable to
Liquid crystal display with side entrance back module, specifically, the light guide plate in backlight module are divided into several subregions, often
Sub-regions are correspondingly arranged a light source, and the light that each light source issues is by the light guide plate of corresponding sub-region by light uniform irradiation in liquid
In brilliant screen mould group, the corresponding light source of each subregion is electrically connected by corresponding first signal wire and driving circuit, realization pair
The independent control of each subregion；It is not limited here.
Based on the same inventive concept, the embodiment of the invention also provides a kind of stimulations of liquid crystal display for SSVEP
Pattern display method, as shown in figure 4, including the following steps:
S1: user inputted in host computer all subregion corresponding with stimulus patterns display area number and with this
The corresponding flicker frequency of each subregion, luminance information and flashing waveform in all subregion, and utilize and liquid crystal display mould group phase
The specific pattern of host computer design stimulus patterns even；
S2: host computer is by the number of received all subregion and corresponding with each subregion in all subregion
Flicker frequency, luminance information and flashing waveform are sent to control circuit, and the stimulus patterns of design are sent to liquid crystal display mould group
It is shown；
S3: the control circuit number of all subregion and corresponding with each subregion in all subregion based on the received
Flicker frequency, luminance information and flashing waveform, synchronize control by all subregions of the driving circuit to backlight module,
Make all subregion flashing state corresponding with stimulus patterns display area in backlight module, the stimulus patterns in liquid crystal display mould group
Display area shows the stimulus patterns of flashing, and all subregion corresponding with any active area is to be always on shape in backlight module
State, any active area in liquid crystal display mould group show any picture.
Above-mentioned stimulus patterns display methods provided in an embodiment of the present invention, when whole subregions of backlight module do not flash
And maintain when being always on state, liquid crystal display mould group can be displayed in full screen any picture, when need liquid crystal display mould group in specified viewing area
When domain shows stimulus patterns, it can use the host computer setting stimulus patterns being connected with liquid crystal display mould group, by the way that backlight is arranged
The flicker frequency of all subregion corresponding with stimulus patterns display area, luminance information and flashing waveform realize stimulation ginseng in mould group
Several settings makes liquid crystal display mould group show there is phase with all subregion in corresponding backlight module in stimulus patterns display area
With flicker frequency, luminance information and flash waveform stimulus patterns, pass through setting backlight module in and any picture-display-region
The corresponding all subregion in domain is to be always on state, so that liquid crystal display mould group is shown any picture in any active area, in this way, both
Liquid crystal display can be made to be displayed in full screen any picture as conventional LCD device, and liquid crystal display mould group can be made to stimulate
Pattern displaying region shows stimulus patterns and shows any picture, and stimulus patterns viewing area in any active area
Domain is independent of each other with any active area.The present invention is replaced existing every using liquid crystal display mould group using backlight module flashing
Flashing is realized in the transformation of one frame, so that the flicker frequency of the stimulus patterns in stimulus patterns display area, luminance information and flashing wave
Shape can be repaired by the flicker frequency of subregion, luminance information and flashing waveform in the backlight module of setting corresponding position
Change, so as to so that stimulus patterns flicker frequency is not limited by screen refresh rate, and can show with any flashing waveform
Stimulus patterns.
In the specific implementation, the step S2 in above-mentioned stimulus patterns display methods provided in an embodiment of the present invention is being executed,
Host computer is by the number of received all subregion and flicker frequency corresponding with each subregion in all subregion, bright
Degree information and flashing waveform are sent to control circuit, and when the stimulus patterns of design being sent to liquid crystal display mould group being shown,
As shown in figure 5, can specifically be accomplished by the following way:
S20: host computer passes through serial ports or bluetooth communication module or universal serial bus for the volume of received all subregion
Number and flicker frequency corresponding with each subregion in all subregion, luminance information and flashing waveform be sent to control electricity
Road, and the stimulus patterns of design are sent to liquid crystal display mould group and are shown；In this way, can be by host computer to backlight module
The flicker frequency of any subregion, luminance information and flashing waveform configured, without in FPGA embedded processing chip
Portion's program, which is modified, to be realized.Specifically, host computer can be by modes such as VGA or HDMI by the stimulus patterns of design
Liquid crystal display mould group is sent to be shown.
In the specific implementation, the step S3 in above-mentioned stimulus patterns display methods provided in an embodiment of the present invention is being executed,
Control circuit based on the received the number of all subregion and flicker frequency corresponding with each subregion in all subregion,
Luminance information and flashing waveform, synchronize control by all subregions of the driving circuit to backlight module, make backlight module
In all subregion corresponding with stimulus patterns display area be flashing state, the stimulus patterns display area in liquid crystal display mould group is aobvious
Show the stimulus patterns of flashing, all subregion corresponding with any active area is to be always on state, liquid crystal display in backlight module
When any active area in mould group shows any picture, as shown in fig. 6, can specifically be accomplished by the following way:
S30: control circuit and driving circuit are realized using pulse width modulation or digital-to-analogue conversion mode and flash frequency
Rate, luminance information and the control for flashing waveform dodge all subregion corresponding with stimulus patterns display area in backlight module
Bright state, the stimulus patterns of the stimulus patterns display area display flashing in liquid crystal display mould group, in backlight module with any picture
The corresponding all subregion in display area is to be always on state, and any active area in liquid crystal display mould group shows any picture.
Above-mentioned liquid crystal display and its stimulus patterns display methods for SSVEP provided in an embodiment of the present invention, will carry on the back
Optical mode group is integrally divided into several sub-regions, can be to each sub-district in backlight module by control circuit and driving circuit
The flicker frequency in domain, luminance information and flashing waveform are individually controlled, do not flash when whole subregions of backlight module and
When maintenance is always on state, liquid crystal display mould group can be displayed in full screen any picture, when need liquid crystal display mould group in specified display area
When showing stimulus patterns, it can use the host computer setting stimulus patterns being connected with liquid crystal display mould group, by the way that backlight mould is arranged
The flicker frequency of all subregion corresponding with stimulus patterns display area, luminance information and flashing waveform realize stimulation parameter in group
Setting, make liquid crystal display mould group stimulus patterns display area show with all subregion in corresponding backlight module have it is identical
Flicker frequency, luminance information and flash waveform stimulus patterns, pass through setting backlight module in and any active area
Corresponding all subregion is to be always on state, so that liquid crystal display mould group is shown any picture in any active area, in this way, both may be used
So that liquid crystal display is displayed in full screen any picture as conventional LCD device, and liquid crystal display mould group can be made in stimulation figure
Case display area shows stimulus patterns and shows any picture, and stimulus patterns display area in any active area
It is independent of each other with any active area.The present invention is replaced existing each using liquid crystal display mould group using backlight module flashing
Flashing is realized in frame transformation, so that the flicker frequency of the stimulus patterns in stimulus patterns display area, luminance information and flashing waveform
It can be modified by the flicker frequency of subregion, luminance information and flashing waveform in the backlight module of setting corresponding position,
So as to so that stimulus patterns flicker frequency is not limited by screen refresh rate, and it can show the thorn with any flashing waveform
Swash pattern, also, due to do not have change liquid crystal display mould group and host computer signal transmission pathway, can according to it is normal
Picture to be shown is needed in the identical method setting liquid crystal display mould stack screen of rule liquid crystal display, without using other specific purpose tools
It is configured, it is easy to use.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (6)
1. a kind of liquid crystal display for SSVEP characterized by comprising liquid crystal display mould group mentions for the liquid crystal display mould group
For the backlight module of backlight, the driving circuit being electrically connected with the backlight module, the control being electrically connected with the driving circuit
Circuit processed is the liquid crystal display mould group, the backlight module, the driving circuit and the power supply electricity of control circuit power supply
Road, and the host computer being electrically connected respectively with the liquid crystal display mould group and the control circuit；Wherein,
The entire plane of the backlight module is divided into several subregions and numbers, and each subregion passes through corresponding the
One signal wire and the driving circuit are electrically connected, the driving circuit by with the first signal wire corresponding second described in every
Signal wire and the control circuit are electrically connected；
When the display area of the liquid crystal display mould group is divided into stimulus patterns display area and any active area, the electricity
Brain server, for receive user input all subregion corresponding with stimulus patterns display area number and with each sub-district
The corresponding flicker frequency of each subregion, luminance information in domain and flashing waveform, by the number of received all subregion and
Flicker frequency corresponding with each subregion in all subregion, luminance information and flashing waveform are sent to the control electricity
Road, and user is sent to the liquid crystal display mould group using the stimulus patterns that the host computer designs and is shown；The control
Circuit processed, for the number of all subregion based on the received and flashing corresponding with each subregion in all subregion frequency
Rate, luminance information and flashing waveform, synchronize control by all subregions of the driving circuit to the backlight module,
Make all subregion flashing state corresponding with stimulus patterns display area in the backlight module, in the liquid crystal display mould group
Stimulus patterns display area shows the stimulus patterns of flashing, each son corresponding with any active area in the backlight module
Region is to be always on state, and any active area in the liquid crystal display mould group shows any picture；
When liquid crystal display mould group picture to be shown is any picture, the control circuit and the driving circuit are to described
All subregions of backlight module synchronize control, and all subregions of the backlight module is made to be always on state, the liquid crystal
Shield any picture of module displays.
2. being used for the liquid crystal display of SSVEP as described in claim 1, which is characterized in that the control circuit is that scene can
Program gate array embedded processing chip.
3. being used for the liquid crystal display of SSVEP as claimed in claim 2, which is characterized in that the field programmable gate array
Embedded processing chip is electrically connected by serial ports or bluetooth communication module or universal serial bus and the host computer.
4. a kind of stimulus patterns display methods of the liquid crystal display as described in any one of claims 1-3 for SSVEP,
It is characterized in that, includes the following steps:
S1: user inputted in host computer all subregion corresponding with stimulus patterns to be shown number and with each sub-district
The corresponding flicker frequency of each subregion, luminance information and flashing waveform in domain, and utilize the electricity being connected with liquid crystal display mould group
The specific pattern of brain server design stimulus patterns；
S2: host computer is by the number of received all subregion and flashing corresponding with each subregion in all subregion
Frequency, luminance information and flashing waveform are sent to control circuit, and the stimulus patterns of design are sent to liquid crystal display mould group and are carried out
Display；
S3: the control circuit number of all subregion and sudden strain of a muscle corresponding with each subregion in all subregion based on the received
Bright frequency, luminance information and flashing waveform, synchronize control by all subregions of the driving circuit to backlight module, make to carry on the back
All subregion corresponding with stimulus patterns to be shown is flashing state in optical mode group, corresponding with all subregion in liquid crystal display mould group
Region display flashing stimulus patterns, other subregions are the state that is always in backlight module, in liquid crystal display mould group with this other
The corresponding region of subregion shows any picture.
5. stimulus patterns display methods as claimed in claim 4, which is characterized in that step S2, host computer will be received each
The number of subregion and flicker frequency corresponding with each subregion in all subregion, luminance information and flashing waveform hair
Control circuit is given, is specifically included:
S20: host computer by serial ports or bluetooth communication module or universal serial bus by the number of received all subregion with
And flicker frequency corresponding with each subregion in all subregion, luminance information and flashing waveform are sent to control circuit.
6. stimulus patterns display methods as described in claim 4 or 5, which is characterized in that step S3, control circuit is according to reception
All subregion number and flicker frequency corresponding with each subregion in all subregion, luminance information and flashing wave
Shape synchronizes control by all subregions of the driving circuit to backlight module, specifically includes:
S30: control circuit and driving circuit realize flicker frequency, bright using pulse width modulation or digital-to-analogue conversion mode
It spends information and flashes the control of waveform.
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