CN118010645A - Compression-preventing quantitative test system and method for cholesteric liquid crystal electronic paper - Google Patents
Compression-preventing quantitative test system and method for cholesteric liquid crystal electronic paper Download PDFInfo
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- CN118010645A CN118010645A CN202410154042.4A CN202410154042A CN118010645A CN 118010645 A CN118010645 A CN 118010645A CN 202410154042 A CN202410154042 A CN 202410154042A CN 118010645 A CN118010645 A CN 118010645A
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- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000012113 quantitative test Methods 0.000 title claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 90
- 238000003825 pressing Methods 0.000 claims abstract description 55
- 230000000694 effects Effects 0.000 claims abstract description 20
- 230000008569 process Effects 0.000 claims abstract description 14
- 238000001228 spectrum Methods 0.000 claims abstract description 6
- 238000004891 communication Methods 0.000 claims abstract description 4
- 230000008859 change Effects 0.000 claims description 9
- 230000003405 preventing effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 7
- 230000002265 prevention Effects 0.000 claims description 7
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 3
- 230000001174 ascending effect Effects 0.000 claims description 3
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- 238000007906 compression Methods 0.000 claims 2
- 230000003287 optical effect Effects 0.000 claims 1
- 238000004458 analytical method Methods 0.000 abstract description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 8
- 210000003128 head Anatomy 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
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- HVYWMOMLDIMFJA-DPAQBDIFSA-N cholesterol Chemical compound C1C=C2C[C@@H](O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2 HVYWMOMLDIMFJA-DPAQBDIFSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003098 cholesteric effect Effects 0.000 description 1
- 235000012000 cholesterol Nutrition 0.000 description 1
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- 230000007613 environmental effect Effects 0.000 description 1
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- 238000002955 isolation Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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- 238000005259 measurement Methods 0.000 description 1
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- 230000002277 temperature effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
The invention provides an anti-pressing quantitative test system and method for cholesteric liquid crystal electronic paper, which relate to the technical field of electronic paper display, wherein the system comprises: the device comprises a central control board, a single-column type pressure intensity testing machine, a desk type spectrocolorimeter and an upper computer, wherein the single-column type pressure intensity testing machine, the desk type spectrocolorimeter and the upper computer are respectively connected with the central control board; the single-column pressure intensity tester simulates the pressure which can be born by the cholesteric liquid crystal electronic paper in the actual use process; the table type spectrocolorimeter detects and monitors display parameters of the cholesteric liquid crystal electronic paper; the upper computer is used for setting parameters of the pressure test and controlling each instrument to collect test data and analyze results; the upper computer and the central control board are connected through communication to ensure that the cholesteric liquid crystal electronic paper keeps working normally in the testing process. The invention is based on the combination test analysis of the pressure intensity tester, the color spectrum analyzer and other instruments, and can finish the quantitative test of the anti-pressing effect of the cholesteric liquid crystal electronic paper.
Description
Technical Field
The invention relates to the technical field of electronic paper display, in particular to an anti-pressing quantitative test system and method for cholesteric liquid crystal electronic paper.
Background
The cholesterol liquid crystal type (Cholesteric LCDs, CHLCD) electronic paper is a novel electronic display technology, has the advantages of low power consumption, high contrast ratio, wide viewing angle, high brightness and the like, and is widely applied to the fields of electronic books, wearable systems, intelligent home furnishings and the like. However, the liquid crystal electronic paper has its own disadvantage in that the reflection mode of CHLCD is directly dependent on the order and direction of the molecular arrangement, since the reflection of ambient light is bragg reflection depending on the geometrical arrangement of liquid crystal molecules. The alignment is realized by weak anchoring, when external force (such as mechanical force and high temperature) acts on the surface of the electronic paper, molecules cannot be recovered if the surface of the liquid crystal layer is affected. When subjected to mechanical forces, the molecular arrangement tends to be planar; when subjected to Gao Wenzuo applications, the molecular alignment tends to be focal conic. High temperature effects can be avoided in normal use environments, but the impact of mechanical forces such as accidental pressures is difficult to avoid.
In order to solve this problem, the prior art adopts a method in which pixels are arranged in a matrix, and each pixel has a cross-section in a cross-shaped structure or a circular structure as a partition wall. The partition wall is made of a viscous hard organic material, and can not only play a role in isolation, but also serve as a partition material together with the sealing frame, so that the thickness of the box (the thickness of the closed space) is more uniform, the height between the first substrate and the second substrate is uniformly kept, the liquid crystal electronic paper display device has a pressing-resistant function, and the uniformity of the liquid crystal box, the pressure resistance of the liquid crystal layer and the impact resistance of the liquid crystal display element can be improved.
The reliability and stability of CHLCD cholesteric liquid crystal electronic paper need to be subjected to strict quality detection and control to ensure the long-term stability and reliability thereof. The anti-pressing quantitative test is an important test in the reliability detection of the electronic paper, and aims to evaluate the stability and reliability of CHLCD cholesteric liquid crystal electronic paper under external pressure.
In the anti-pressing test, a certain pressure needs to be applied to the electronic paper to simulate various conditions possibly encountered in actual use. In the conventional anti-pressing test, a manual pressing mode is generally adopted, and the method has many problems such as low test efficiency, incapability of quantitatively comparing test results, incapability of realizing automatic test and the like.
Disclosure of Invention
In view of the above, the present invention provides a quantitative test system and a quantitative test method for preventing pressing of a cholesteric liquid crystal electronic paper, so as to perform objective and accurate quantitative test and performance evaluation on the pressing preventing effect of the cholesteric liquid crystal electronic paper, and further help to improve the pressing preventing quality and effect of the cholesteric liquid crystal electronic paper.
For this purpose, the invention adopts the following technical scheme:
The invention provides an anti-pressing quantitative test system for cholesteric liquid crystal electronic paper, which comprises: a single column type pressure intensity testing machine, a desk type spectrocolorimeter and an upper computer; the single-column type pressure intensity testing machine and the desk type spectrocolorimeter are respectively connected with a central control board arranged in the upper computer;
The single-column type pressure intensity testing machine is used for simulating the pressure possibly born by the cholesteric liquid crystal electronic paper in the actual use process;
The desk-top beam split color meter comprises a plurality of measuring calibers, and detects and monitors display parameters of the cholesteric liquid crystal electronic paper;
the upper computer is used for setting parameters of pressure test to control each instrument to collect test data and analyze results; the upper computer is connected with the central control board through communication to ensure that the cholesteric liquid crystal electronic paper keeps working normally in the testing process.
Further, the single column type pressure strength tester includes: the pressure test device comprises a pressing contact for simulating hand pressing in actual use, an electronic control system, a sensor and a display, wherein the electronic control system controls a speed regulating motor to rotate through a speed regulator, and drives a T-shaped screw to drive a load to induce ascending and descending after the speed regulating motor is decelerated through a speed-changing mechanical mechanism so as to complete the pressure test; the sensor is used for detecting the pressure value.
Further, the pressing contact adopts a soft rubber head.
Further, the desk-top spectrocolorimeter can automatically recognize and adjust the light path.
Further, the display parameters include: color, brightness, and contrast.
Further, the parameters of the pressure test include: pressure magnitude, duration of action and number of tests.
The invention also provides an anti-pressing quantitative test method for the cholesteric liquid crystal electronic paper, which is applied to the anti-pressing quantitative test system for the cholesteric liquid crystal electronic paper and comprises the following steps of:
S1, selecting a cholesteric liquid crystal electronic paper sample, communicating with a central control board through an upper computer, and issuing a command to enable the cholesteric liquid crystal electronic paper to start working and ensure that the sample is in a normal working state;
S2, when the sample works normally, firstly using a desk-top spectrocolorimeter to detect the sample for the first time, and determining screen display parameters and display effects under the condition that no external other pressure is influenced;
S3, placing the sample on a testing platform of a single-column type pressure intensity testing machine after the first detection is finished, ensuring that the display surface faces upwards, and then setting parameters of pressure testing;
s4, gradually increasing the pressure of the pressure testing device, and observing the display effect and physical property change of the cholesteric liquid crystal electronic paper; stay for a period of time at each pressure point to fully test the properties of the sample;
S5, in the testing process, using a color spectrum analyzer to monitor, adjust and acquire data of display parameters of the cholesteric liquid crystal electronic paper in real time, and recording performance of the cholesteric liquid crystal electronic paper at each pressure point;
S6, after all the pressure tests are completed, carefully observing the sample, evaluating the overall performance and durability of the sample, comparing and analyzing the display data after the pressure tests with the first test data, and quantifying the influence of different pressures on the display parameters of the cholesteric liquid crystal electronic paper.
Further, the method further comprises the following steps: comparing the display performance of the samples after different pressure tests and the change of various values, and quantifying the relation between the specific pressure and the display effect and the values.
Further, the method further comprises the following steps: and testing a plurality of groups of cholesteric liquid crystal type electronic paper samples.
Further, the recorded performance comprises at least: whether there is color distortion, brightness degradation, and physical distortion.
The invention has the advantages and positive effects that:
The invention provides an anti-pressing quantitative test system and method for cholesteric liquid crystal electronic paper, which are based on the combination test analysis of instruments such as a pressure intensity tester, a color spectrum analyzer and the like, and can finish the anti-pressing quantitative test of the cholesteric liquid crystal electronic paper and test the anti-pressing effect. The pressure intensity testing machine has high precision, the force measurement precision (within +/-0.5% of the indication value), the resolution precision of the desk-top beam-splitting color meter is 0.01%, the detection result is objective, and the research and development personnel and the quality inspection link are not relied on to evaluate by human eyes. Therefore, the test system is simple and accurate, the test method is simple and easy to implement, and the degree of automation is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a block diagram of a system for quantitatively testing the anti-pressing property of cholesteric liquid crystal electronic paper according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a single column type pressure strength tester according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a desk-top spectrometer according to an embodiment of the present invention;
Fig. 4 is a flowchart of a method for quantitatively testing the anti-pressing property of the cholesteric liquid crystal electronic paper according to an embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or system that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or system.
Aiming at the problem of quantitative test of the cholesteric liquid crystal electronic paper in terms of pressing prevention, the invention provides a quantitative test system and a quantitative test method for the cholesteric liquid crystal electronic paper in terms of pressing prevention. So as to realize the quick, stable and reliable anti-pressing test of the cholesteric liquid crystal electronic paper. The test scheme can simulate various conditions in actual use, improves test efficiency and stability, and provides powerful technical support for production and application of electronic paper.
As shown in fig. 1, an embodiment of the present invention provides an anti-pressing quantitative test system for a cholesteric liquid crystal electronic paper, which is an anti-pressing display device capable of testing and evaluating a cholesteric liquid crystal electronic paper, comprising: a single column type pressure intensity testing machine 1, a desk type spectrocolorimeter 2 and an upper computer 3.
Wherein:
As shown in fig. 2, the single column type pressure strength tester 1 in the embodiment of the present invention is a specially tailored pressure strength tester, and mainly includes: a control feedback display device 101, a screen stage 102, a pressing head clamp 103, and a single-column screw speed change mechanism 104. The special customization is embodied in several aspects: 1. according to CHLCD screen characteristics, the experimental machine customizes the sensor with higher accuracy. 2. A steel stage that can hold CHLCD screens is custom made to hold the screens. 3. The customized pressing head adopts a soft rubber head, and is then ground into different sizes to simulate the condition of pressing by fingers as far as possible. The pressure strength testing machine is simple in structure and convenient to operate, can be placed on a workbench for experiments, and the pressing contact adopts a customized soft rubber head to simulate hand pressing in actual use. The pressure intensity testing machine adopts an electronic control system, controls a speed regulating motor to rotate through a speed regulator, and drives a T-shaped screw to drive a load to induce ascending and descending after the speed is reduced through a speed changing mechanical mechanism so as to complete a pressure test. The force value is output by the sensor, fed back to the display and displayed in real time by the experimental displacement. The testing machine can simulate the pressure possibly born by the cholesteric liquid crystal electronic paper in the actual use process, and can accurately quantify the pressure input in the testing process.
As shown in fig. 3, the desk-top spectrocolorimeter 2 includes: the feedback display device 201, the test port 202, and the jig 203 are controlled. In specific implementation, the desk-top beam split color meter 2 is connected with the single-column pressure intensity testing machine 1, is convenient to operate, various in measuring caliber, automatic in instrument recognition and light path adjustment, manual in the art, double-light path spectrum analysis, and rich and complete in color space. The instrument can detect and monitor the color, brightness and contrast of the cholesteric liquid crystal electronic paper, and ensure the influence of the relation between the display effect and the stressed pressure.
Upper computer 3: the built-in central control board is respectively connected with the single-column type pressure intensity testing machine 1 and the desk type spectrocolorimeter 2, and the upper computer and the central control board are connected through communication, so that the cholesteric liquid crystal electronic paper is ensured to keep working normally in the testing process by the upper computer and the central control board. And setting various parameters to control the systems to collect test data and analyze results.
With the anti-pressing quantitative test system in the above embodiment, the embodiment of the present invention provides an anti-pressing quantitative test method for cholesteric liquid crystal electronic paper, as shown in fig. 4, which includes the following steps:
s1, selecting a representative cholesteric liquid crystal electronic paper sample, communicating with a central control board through an upper computer, and issuing a command to enable the cholesteric liquid crystal electronic paper to start working and ensure that the sample is in a normal working state.
In the implementation, the method can be suitable for the pressure test of the cholesteric liquid crystal electronic paper with various sizes and various display mechanisms.
S2, when the sample works normally, the desk-top spectrocolorimeter is used for detecting the sample for the first time, and the screen display effect and specific numerical values, such as color, brightness contrast and display effect, under the condition that no external other environmental influences such as pressure exist are determined.
S3, placing the sample on a testing platform of the single-column type pressure intensity tester after the first detection is finished, ensuring that the display surface faces upwards, and then setting parameters of pressure testing, such as pressure magnitude, action time, testing times and the like.
And S4, gradually increasing the pressure of the pressure testing device, and observing the display effect and the physical property change of the cholesteric liquid crystal electronic paper. Stay at each pressure point for a period of time to fully test the sample's performance.
And S5, in the testing process, using a color spectrum analyzer to monitor, adjust and acquire the color, brightness and contrast of the cholesteric liquid crystal electronic paper in real time, and recording the performance of the cholesteric liquid crystal electronic paper under each pressure point, including whether the color distortion, brightness reduction, physical deformation and the like occur.
S6, after all the pressure tests are completed, carefully observing the sample, evaluating the overall performance and durability of the sample, comparing and analyzing the display data after the pressure tests with the first test data, calculating and then quantifying out the influence of different pressures on the display performance such as color, brightness, contrast and the like of the cholesteric liquid crystal electronic paper through an algorithm.
The specific algorithm comprises the following steps:
According to the color difference range recognized by human eyes, the color difference value can be seen how much:
The delta E >1 or more is visible to the human eye;
if ΔE < 1, it is difficult to identify the human eye, and only the color difference meter can be used for judging, and the human eye cannot identify the range.
Therefore, when Δe <1, the currently applied force does not change the display effect, this force is the force of the pressing prevention effect (the larger the force at this time is, the better the pressing prevention effect is).
1< DELTAE <3, the measured color is hardly distinguishable from the standard color human eye;
3< DELTAE <6, the trained person can distinguish the measured color from the standard color;
6< [ delta ] E, the human eye can obviously distinguish the measured color from the standard color.
According to the theory above, the detection by the desk-top spectrocolorimeter is followed by calculation of Δe before and after screen pressing, and the pressing prevention effect is quantified by the difference between Δe before and after pressing.
S7, the display performance of the samples after different pressure tests is compared with the change of various values. And calculating the relation between quantitative specific pressure, display effect and numerical value through an algorithm, thereby measuring the anti-pressing effect and completing the quantitative test of the cholesteric liquid crystal electronic paper for preventing pressing.
And S8, repeating the steps, and testing a plurality of groups of cholesteric liquid crystal type electronic paper samples to obtain more comprehensive performance data.
And (3) carrying out multiple groups of repeated experiments, taking an average value to avoid experimental errors, and measuring Lab and RGB values and a spectrum curve by a desk-top spectrocolorimeter, wherein the change of the data before and after pressing can assist in judging the pressing prevention effect, so as to prove the value of delta E.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. An anti-pressing quantitative test system for cholesteric liquid crystal electronic paper is characterized by comprising: a single column type pressure intensity testing machine, a desk type spectrocolorimeter and an upper computer; the single-column type pressure intensity testing machine and the desk type spectrocolorimeter are respectively connected with a central control board arranged in the upper computer;
The single-column type pressure intensity testing machine is used for simulating the pressure possibly born by the cholesteric liquid crystal electronic paper in the actual use process;
The desk-top beam split color meter comprises a plurality of measuring calibers, and detects and monitors display parameters of the cholesteric liquid crystal electronic paper;
the upper computer is used for setting parameters of pressure test to control each instrument to collect test data and analyze results; the upper computer is connected with the central control board through communication to ensure that the cholesteric liquid crystal electronic paper keeps working normally in the testing process.
2. The quantitative test system for pressing prevention for cholesteric liquid crystal electronic paper according to claim 1, wherein the single column type press strength tester comprises: the pressure test device comprises a pressing contact for simulating hand pressing in actual use, an electronic control system, a sensor and a display, wherein the electronic control system controls a speed regulating motor to rotate through a speed regulator, and drives a T-shaped screw to drive a load to induce ascending and descending after the speed regulating motor is decelerated through a speed-changing mechanical mechanism so as to complete the pressure test; the sensor is used for detecting the pressure value.
3. The quantitative test system for preventing pressing against cholesteric liquid crystal electronic paper according to claim 2, wherein the pressing contact is a soft rubber head.
4. The quantitative test system for preventing pressing against a cholesteric liquid crystal electronic paper according to claim 1, wherein the desk-top spectrometer is capable of automatically recognizing and adjusting the optical path.
5. The method for quantitatively testing the pressing resistance of the cholesteric liquid crystal electronic paper according to claim 1, wherein the display parameters include: color, brightness, and contrast.
6. The method for quantitatively testing the pressing resistance of the cholesteric liquid crystal electronic paper according to claim 1, wherein the parameters of the pressure test include: pressure magnitude, duration of action and number of tests.
7. A quantitative test method for preventing pressing against a cholesteric liquid crystal electronic paper, characterized by applying the quantitative test system for preventing pressing against a cholesteric liquid crystal electronic paper according to any one of claims 1 to 6, comprising the steps of:
S1, selecting a cholesteric liquid crystal electronic paper sample, communicating with a central control board through an upper computer, and issuing a command to enable the cholesteric liquid crystal electronic paper to start working and ensure that the sample is in a normal working state;
S2, when the sample works normally, firstly using a desk-top spectrocolorimeter to detect the sample for the first time, and determining screen display parameters and display effects under the condition that no external other pressure is influenced;
S3, placing the sample on a testing platform of a single-column type pressure intensity testing machine after the first detection is finished, ensuring that the display surface faces upwards, and then setting parameters of pressure testing;
s4, gradually increasing the pressure of the pressure testing device, and observing the display effect and physical property change of the cholesteric liquid crystal electronic paper; stay for a period of time at each pressure point to fully test the properties of the sample;
S5, in the testing process, using a color spectrum analyzer to monitor, adjust and acquire data of display parameters of the cholesteric liquid crystal electronic paper in real time, and recording performance of the cholesteric liquid crystal electronic paper at each pressure point;
S6, after all the pressure tests are completed, carefully observing the sample, evaluating the overall performance and durability of the sample, comparing and analyzing the display data after the pressure tests with the first test data, and quantifying the influence of different pressures on the display parameters of the cholesteric liquid crystal electronic paper.
8. The method for quantitatively determining compression resistance of a cholesteric liquid crystal electronic paper according to claim 7, further comprising: comparing the display performance of the samples after different pressure tests and the change of various values, and quantifying the relation between the specific pressure and the display effect and the values.
9. The method for quantitatively determining compression resistance of a cholesteric liquid crystal electronic paper according to claim 7, further comprising: and testing a plurality of groups of cholesteric liquid crystal type electronic paper samples.
10. The method for quantitatively testing the pressing resistance of the cholesteric liquid crystal electronic paper according to claim 7, wherein the recorded performance comprises at least: whether there is color distortion, brightness degradation, and physical distortion.
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