CN204086731U - Liquid crystal dynamic response test macro - Google Patents
Liquid crystal dynamic response test macro Download PDFInfo
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- CN204086731U CN204086731U CN201420406522.7U CN201420406522U CN204086731U CN 204086731 U CN204086731 U CN 204086731U CN 201420406522 U CN201420406522 U CN 201420406522U CN 204086731 U CN204086731 U CN 204086731U
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Abstract
The utility model is a kind of liquid crystal dynamic response test macro, this system composition comprises power module, single-chip minimum system, numeral method module, key-press module, MSP430 minimum systematic module, LCD driver module, LCD, serial data transmission module and signal acquisition module, its order of connection is power module, numeral method module, key-press module, LCD driver module, MSP430 minimum systematic module is connected with single-chip minimum system respectively, LCD driver module is connected with LCD, signal acquisition module is connected with LCD, power module, signal acquisition module, serial data transmission module is connected with MSP430 minimum systematic module respectively.The utility model is simple to operate, and system can apply potential pulse that user arranges and the response of real-time measurement sensor module and obtain data, the Plotting data liquid crystal dynamic response curve that can experimentally obtain to liquid crystal cell automatically.
Description
Technical field:
What the utility model designed is liquid crystal dynamic response proving installation, can measure the response of liquid crystal under different driving voltage, and according to the dynamic response curve measuring the data obtained drafting liquid crystal, can be applied to actual production life and liquid crystal display etc.
Background technology:
In some is produced and lives, the fixing, liquid crystal display, exact science experiment etc. of such as film, produce or experimental implementation person is necessary to know when being applied to the voltage of certain magnitude of voltage of liquid crystal cell, the dynamic response data of liquid crystal and response curve.
Different voltage is applied to liquid crystal cell (LCD), even if incident intensity is constant, its transmitted light intensity also can change, when incident intensity is in some fixed values, if liquid crystal cell does not apply any voltage, then transmitted light intensity is also in a certain fixed value, its value can be drawn by silicon photocell sensor measurement, if at a time apply a potential pulse on liquid crystal cell, then transmitted light intensity can correspondingly change in scope at this moment, this change can be showed on silicon photocell sensor the two poles of the earth, experimenter observes this change intuitively by digital oscilloscope, and when applying the potential pulse of different amplitude, the change of transmitted light intensity is different.Therefore, can by controlling to apply different potential pulses and detecting the response of silicon photocell sensor and draw the dynamic response of liquid crystal.Ensureing that under the certain prerequisite of incident intensity, we wish that system can regulate the driving voltage on LCD automatically, the response of real time automatic detection silicon photocell sensor return data.For this reason, we have developed liquid crystal dynamic response test macro.
Utility model content:
In order to test under the prerequisite providing fixing incident intensity, apply the dynamic response of liquid crystal during different amplitude voltage pulse, the utility model provides a kind of novel liquid crystal dynamic response test macro.This device by the pulse of Single-chip Controlling analog-digital chip outputting standard, and uses silicon photocell sensor to the characteristic of light intensity sensitivity, makes a response to the change of transmitted light intensity, thus draws the dynamic response of the liquid crystal when applying different amplitude voltage pulse; By the sensor in signal acquisition module, what adopt is linear, namely electric current is with intensity of illumination linear change, when the magnitude of voltage being applied to liquid crystal cell is different, the light transmission rate of liquid crystal cell can change, and transmitted light is radiated on the light-sensitive surface of sensor, the output current of sensor changes with light intensity change, like this, just can be obtained the experimental data of liquid crystal dynamic response by the curent change of pick-up transducers, and draw empirical curve.
The technical solution of the utility model is:
A kind of liquid crystal dynamic response test macro, this system composition comprises power module, single-chip minimum system, numeral method module, key-press module, MSP430 minimum systematic module, LCD driver module, LCD, serial data transmission module and signal acquisition module, its order of connection is power module, numeral method module, key-press module, LCD driver module, MSP430 minimum systematic module is connected with single-chip minimum system respectively, LCD driver module is connected with LCD, signal acquisition module is connected with LCD, power module, signal acquisition module, serial data transmission module is connected with MSP430 minimum systematic module respectively.
It is LM7805 stabilivolt and AMS1117-3.3 integrated voltage-stabilized chip that described power module comprises separately independently model; Its annexation is that LM7805 is connected with single-chip minimum system; Integrated voltage-stabilized chip AMS1117-3.3 is connected with MSP430 minimum systematic module.
The composition of described signal acquisition module comprises silicon photocell sensor.
The composition of described LCD driver module comprises lcd drive voltage amplitude controller, A road DA changes, B road DA changes three parts; Its annexation is that lcd drive voltage amplitude controller is changed with A road DA, B road DA changes and is connected respectively with single-chip minimum system.
Described single-chip minimum system comprises the single-chip microcomputer that model is STC89C52.
Described MSP430 minimum systematic module comprises the single-chip microcomputer of model MSP430F149.
The beneficial effects of the utility model are:
The utility model is simple to operate, the potential pulse of different amplitude is set according to the demand of user, system can apply potential pulse that user arranges and the response of real-time measurement sensor module and obtain data to liquid crystal cell automatically, be equipped with numeral method function simultaneously, can current operating state be shown, be convenient to the state that user understands liquid crystal cell; Fuzzy user is arranged for original state, system automatic detection function can be utilized, the Plotting data liquid crystal dynamic response curve experimentally obtained.
Accompanying drawing illustrates:
The structural drawing of Fig. 1 the utility model liquid crystal dynamic response test macro
The structural drawing of Fig. 2 the utility model LCD driver module
Fig. 3 the utility model system power supply schematic diagram, wherein, Fig. 3 (1) is L7805CV stabilivolt power principle figure; Fig. 3 (2) is AMS1117-3.3 integrated voltage-stabilized chip power schematic diagram
Fig. 4 the utility model lcd drive voltage amplitude controller schematic diagram
Fig. 5 the utility model A road DA transfer principle figure
Fig. 6 the utility model B road DA transfer principle figure
Fig. 7 the utility model single-chip minimum system schematic diagram
Fig. 8 the utility model numeral method module principle figure
Fig. 9 the utility model MSP430 minimum system schematic diagram
Figure 10 the utility model key-press module schematic diagram
Twisted nematic liquid crystal dynamic response theoretical curve under Figure 11 the utility model 3 volts of voltages
Twisted nematic liquid crystal dynamic response empirical curve under Figure 12 the utility model 3 volts of voltages
Embodiment:
As Fig. 1, the utility model system composition comprises power module (1), single-chip minimum system (2), numeral method module (3), key-press module (4), MSP430 minimum systematic module (5), LCD driver module (6), LCD (7), serial data transmission module (8) and signal acquisition module (9), its order of connection is power module (1), numeral method module (3), key-press module (4), LCD driver module (6), MSP430 minimum systematic module (5) is connected with single-chip minimum system (2) respectively, LCD driver module (6) is connected with LCD (7), signal acquisition module (9) is connected with LCD (7), power module (1), signal acquisition module (9), serial data transmission module (8) is connected with MSP430 minimum systematic module (5) respectively.
Wherein power module (1) is LM7805 stabilivolt (as Fig. 3 (1)) and AMS1117-3.3 integrated voltage-stabilized chip (as Fig. 3 (2)) composition primarily of respective independently model.Its annexation is that LM7805 is connected with single-chip minimum system (2); Integrated voltage-stabilized chip AMS1117-3.3 is connected with MSP430 minimum systematic module (5).
The composition of described signal acquisition module (9) comprises the silicon photocell sensor that model is HS116K; LCD (7) liquid crystal cell is buied by Hebei Jiya Electronics Co., Ltd., and the liquid crystal material of perfusion is P0616A (E7), is purchased by Shijiazhuang Chengzhi Yonghua Display Materials Co., Ltd..
As Fig. 2, the composition of described LCD driver module (6) comprises lcd drive voltage amplitude controller (11), A road DA changes (12), B road DA changes (10) three parts; Its annexation is that lcd drive voltage amplitude controller (11) changes (12) with A road DA, B road DA changes (10) and is connected respectively with single-chip minimum system (2).
Described single-chip minimum system by model be the single-chip microcomputer of STC89C52, button one, the model resistance one that is 1K Ω, the model electric capacity three that is 100pF, frequency be that 12MHz crystal oscillator one forms, its annexation is as shown in Figure 7.
Described MSP430 minimum systematic module (5) by the single-chip microcomputer of model MSP430F149, model be the electric capacity two of 100pF, model is that each one of the crystal oscillator of 12MHz, 32768Hz forms, its annexation is as shown in Figure 9.
Described key-press module is that the resistance of 10K Ω and four buttons form by four models, and its annexation as shown in Figure 10.
Lcd drive voltage amplitude controller (11), A road DA changes (12) and B road DA and changes the chip that (10) are all LM358 primarily of the respective independently model chip that is DAC0832 and model and form, D0 ~ D7 pin of the DAC0832 wherein in (11) is corresponding with the P0 port of single-chip microcomputer to be connected, the Iout1 of DAC0832, Iout2 pin respectively with the inverting input of the amplifier of in LM358, in-phase input end is connected, the Rfb pin of DAC0832 is connected with the output terminal of aforesaid amplifier, the CE of DAC0832, WR1, WR2, XFAL pin is all connected with GND, the ILE pin of DAC0832 is connected with VCC.(12) connect together with the D0 ~ D7 being distinguished as (12) of (11) and be connected with the output of (11), (10) connect together with the D0 ~ D7 that is distinguished as of (11) and are connected with the output terminal of (11).Its annexation is respectively shown in Fig. 4, Fig. 5, Fig. 6.
Because the single-chip microcomputer pin in this system is limited, so can only adopt the simple display of Presentation Function, what adopt in the present system is double figures code tube display.Numeral method module as shown in Figure 8
Powered to other modules by power module (1) after powering on, system works is in automatic measurement pattern, preset driving voltage is every 10s applying LCD pulsewidth is the pulse of 200ms, and the amplitude of potential pulse is step value with 1.0V, provides the potential pulse of 1.0-10.0V.Light intensity is converted to electric signal by signal acquisition module (9) and sends MSP430F149 single-chip microcomputer to by intensity of illumination, obtain the data of liquid crystal dynamic response after the electric signal that single-chip microcomputer analytic signal acquisition module (9) transmits, data are sent to host computer by serial data transmission module (8).When extraneous light intensity is constant, apply with the potential pulse of different amplitude to LCD (7) liquid crystal cell, and by single-chip minimum system (2) to MSP430 minimum systematic module (5) trigger pips, signal acquisition module (9) output voltage reduces, after MSP430 single-chip microcomputer is analyzed, obtain silicon photocell sensor dynamic response data in signal acquisition module.
Single-chip microcomputer is by realizing the scanning analysis of key-press module (4) increasing the driving voltage of LCD (7), reducing driving voltage, the liquid crystal characteristic test function of LCD (7).The test of liquid crystal characteristic is that the driving voltage being step value with 1.0V from 1.0V to 10.0V by single-chip microcomputer generation drives LCD, voltage steps value and amplitude are all adjustable, the potential pulse amplitude data exported shows through numeral method module (3) by one-chip computer module (2), so that operator observes.Silicon photocell sensor is made a response to light intensity change, reacts the data drawn and sends MSP430F149 single-chip microcomputer to through signal acquisition module (9).MSP430F149 single-chip microcomputer processes data and judges, and returns to host computer via serial data transmission module.After data acquisition completes, data processing method and software just can be utilized to obtain result, and described method and software are the known technology of this area data acquisition and process, and this area ordinary person just can realize naturally according to these devices.
As Figure 11, twisted nematic liquid crystal dynamic response theoretical curve under 3 volts of described voltages, namely transmitted light intensity time dependent theoretical curve when LCD applies and removes 3V voltage, during making alive, liquid crystal cell is not printing opacity, and transmitance is maximum, after applying 3V voltage, significant change is there is in transmitted light intensity within very short time, transmitted light reaches minimum, and after removing 3V voltage, transmitted light intensity returns to again intensity when not applying voltage in one relatively long-time.Theoretical curve calculation procedure is as follows:
1) obtaining liquid crystal cell system applying equation of equilibrium state when a certain voltage reaches balance by the derivation of liquid crystal theory of elasticity, utilizing the distribution of finite-difference iterative method numerical simulation liquid crystal molecule in liquid crystal cell, be i.e. liquid crystal director distribution.
2) Jones matrix of each liquid crystal sublayer can be obtained by the distribution of liquid crystal director, liquid crystal cell dynamic response theoretical curve can be obtained by Extended Jones matrix Method for Numerical Simulation.
As Figure 12, twisted nematic liquid crystal dynamic response empirical curve under 3 volts of voltages that the utility model systematic survey obtains, corresponding normal white mode LCD, namely the polarizer is placed with analyzer transmission optical axis is mutually vertical, liquid crystal cell frictional direction and the polarizer at 45 °.Experiment measuring process is as follows:
1) select the light of specific wavelength as light source (if wavelength is the He-Ne laser instrument of 632.8nm).Regulate optical device coaxially contour, guarantee light path is unimpeded, apply to liquid crystal cell or remove voltage, silicon photocell sensor is utilized to gather change in optical signal in this process, gathering density is that every 500ns gathers once, collection duration is 300ms, namely gathers 600 data, obtains the transmitted intensity change in voltage change process;
2) using the data that collect as ordinate, the interpolation time is horizontal ordinate, obtains liquid crystal cell transmitted light intensity relation over time in voltage change process;
3) utilize data processing software to draw, experimental data is done the raw measurement results that normalized obtains black; The method that normalized measurement result utilizes consecutive point to be averaging is processed, obtains the matched curve of hollow out triangle; Matched curve be again normalized, obtain the net result (i.e. the matched curve of hollow out pentagram) of empirical curve, in figure, each curvilinear abscissa is the time, and unit is ms, and ordinate is liquid crystal cell optical transmittance, dimensionless;
4) lcd drive voltage is that stepped voltage increases progressively with 1.0V from 1.0V to 10.0V, records the dynamic response empirical curve under different driving voltage.
Figure 11 and Figure 12 is theory and the Experimental comparison of LCD dynamic response, its rise and downtrending basically identical, this result also demonstrate that the necessity of employing linear silicon photocell sensor.Be optimum configurations some difference a little of LCD in theory calculate and actual measurement, cause two figure to there is little difference.The dynamic response characteristic of liquid crystal can be measured by comparative illustration native system well, obtain liquid crystal dynamic response curve.
The utility model unaccomplished matter is known technology.
Claims (4)
1. a liquid crystal dynamic response test macro, it is characterized by this system composition and comprise power module, single-chip minimum system, numeral method module, key-press module, MSP430 minimum systematic module, LCD driver module, LCD, serial data transmission module and signal acquisition module, its order of connection is power module, numeral method module, key-press module, LCD driver module, MSP430 minimum systematic module is connected with single-chip minimum system respectively, LCD driver module is connected with LCD, signal acquisition module is connected with LCD, power module, signal acquisition module, serial data transmission module is connected with MSP430 minimum systematic module respectively,
The composition of described signal acquisition module comprises silicon photocell sensor;
The composition of described LCD driver module comprises lcd drive voltage amplitude controller, A road DA changes, B road DA changes three parts; Its annexation is that lcd drive voltage amplitude controller is changed with A road DA, B road DA changes and is connected respectively with single-chip minimum system.
2. liquid crystal dynamic response test macro as claimed in claim 1, it is characterized by described power module, to comprise separately independently model be L7805CV stabilivolt and AMS1117-3.3 integrated voltage-stabilized chip; Its annexation is that L7805CV is connected with single-chip minimum system; Integrated voltage-stabilized chip AMS1117-3.3 is connected with MSP430 minimum systematic module.
3. liquid crystal dynamic response test macro as claimed in claim 1, is characterized by described single-chip minimum system and comprises the single-chip microcomputer that model is STC89C52.
4. liquid crystal dynamic response test macro as claimed in claim 1, is characterized by the single-chip microcomputer that described MSP430 minimum systematic module comprises model MSP430F149.
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| CN201420406522.7U CN204086731U (en) | 2014-07-22 | 2014-07-22 | Liquid crystal dynamic response test macro |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353088A (en) * | 2015-11-12 | 2016-02-24 | 湖北大学 | Electrically controlled light scattering material and device time-domain response characteristic testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105353088A (en) * | 2015-11-12 | 2016-02-24 | 湖北大学 | Electrically controlled light scattering material and device time-domain response characteristic testing method |
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Granted publication date: 20150107 Termination date: 20160722 |
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| CF01 | Termination of patent right due to non-payment of annual fee |