CN108254949A - The service life of liquid crystal display panel and the evaluation method of maximum curvature under a kind of curved surface state - Google Patents
The service life of liquid crystal display panel and the evaluation method of maximum curvature under a kind of curved surface state Download PDFInfo
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- CN108254949A CN108254949A CN201810075927.XA CN201810075927A CN108254949A CN 108254949 A CN108254949 A CN 108254949A CN 201810075927 A CN201810075927 A CN 201810075927A CN 108254949 A CN108254949 A CN 108254949A
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- breakdown strength
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
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- Nonlinear Science (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention provides the service life of liquid crystal display panel and the evaluation method of maximum curvature under a kind of curved surface state, and the evaluation method in the service life of liquid crystal display panel includes under the curved surface state：First obtain bending stress of the glass substrate for being used to prepare liquid crystal display panel under preset curvature；By carrying out failure test to a series of glass substrates after cutting edging, the destruction mean stress of the glass substrate is obtained；The breakdown strength of the glass substrate is obtained according to the destruction mean stress；According to the breakdown strength and the bending stress, the service life of the liquid crystal display panel under curved surface state is estimated.Simultaneously under certain life requirements, the maximum curvature of the liquid crystal display panel counter can be pushed away, so as to instruct the design of liquid crystal display panel under curved surface state, improves the reliability of liquid crystal display panel.
Description
Technical field
Service life and maximum the present invention relates to liquid crystal display panel under technical field of liquid crystal display more particularly to a kind of curved surface state
The evaluation method of curvature.
Background technology
Curved surface module is increasingly becoming one of the mainstream in market because of the telepresenc of its distinguished appearance and shock in recent years.
One curved surface module is mainly made of BLU (backboard and optical component), liquid crystal display panel and corresponding front frame.During actual assembled, first
BLU is assembled, the liquid-crystalline glasses of flat state are positioned on BLU, then front frame is covered, so as to keep flexuosity.
It is found in actual production process, though liquid crystal display panel glass can bear bending stress in short term, the fatigue effect under long term is not
Very clearly, especially radius of curvature very little, in the case that glass substrate is thicker.If design is overly conservative, for example curvature is very
Greatly, curved surface visual effect cannot be met, if design excessively extreme, curvature very little, the LCD of glass substrate is in a period of time
The phenomenon that just will appear fragmentation afterwards.This is because TFT the and CF substrates of LCD are the glass of fragile material, in cutting edging procedure
In can all generate many micro-cracks, and the breakdown strength of glass just relies on the quantity and size with these micro-cracks.With the time
Increase, the micro-crack of flexuosity glass edge can also increase, and breakdown strength can reduce.When it reaches certain quantity and ruler
Very little, breakdown strength cannot bear the bending stress of glass, then the glass being bent will crack.
Therefore, in deisgn product, the curved surface state liquid crystal display panel service life how is estimated, exploring curved surface state liquid crystal display panel can
With the maximum curvature of realization, there is very important influence to liquid crystal display panel industry.
Invention content
The present invention provides the service life of liquid crystal display panel and the evaluation method of maximum curvature under a kind of curved surface state, can disclose song
The life cycle of liquid crystal display panel under surface state instructs the design of liquid crystal display panel, improves the reliability of liquid crystal display panel under curved surface state.
To solve the above problems, technical solution provided by the invention is as follows：
The present invention provides a kind of evaluation method in the service life of liquid crystal display panel under curved surface state, and the method includes following steps
Suddenly：
Step S10, bending stress of the glass substrate for being used to prepare liquid crystal display panel under preset curvature is obtained；
Step S11, by carrying out failure test to a series of glass substrates after cutting edging, the glass is obtained
The destruction mean stress of substrate；
Step S12, the breakdown strength of the glass substrate is obtained according to the destruction mean stress；
Step S13, according to the breakdown strength and the bending stress, the longevity of the liquid crystal display panel under curved surface state is estimated
Life.
According to one preferred embodiment of the present invention, the breakdown strength Normal Distribution.
According to one preferred embodiment of the present invention, the step S13 includes：The glass substrate is obtained under different fragment rates
The breakdown strength, according to the breakdown strength and the bending stress, estimate that the liquid crystal display panel is reaching described default
When curvature, if be destroyed.
According to one preferred embodiment of the present invention, when the breakdown strength is more than the bending stress, the glass substrate exists
When reaching the preset curvature, it will not be destroyed.
According to one preferred embodiment of the present invention, the step S13 includes：According to the breakdown strength and the bending stress
And the tired factor, obtain after the glass substrate is bent to the preset curvature until rupture time used, it is described until
The rupture time used is the service life of the liquid crystal display panel.
The present invention also provides a kind of evaluation method of the maximum curvature of liquid crystal display panel under curved surface state, the method includes with
Lower step：
Step S20, acquisition prepares breakdown strength of the glass substrate of liquid crystal display panel under different fragment rates；
Step S21, according to life expectancy, in conjunction with the breakdown strength and the tired factor, the glass substrate is obtained
Bending stress；
Step S22, according to the bending stress, maximum curvature of the liquid crystal display panel under the life expectancy is obtained.
According to one preferred embodiment of the present invention, the step S20 includes the following steps：
Step S201, failure test is carried out to a series of glass substrate after cutting edgings, obtains the glass substrate
Destroy mean stress；
Step S202, it is strong according to destruction of the destruction mean stress acquisition glass substrate under different fragment rates
Degree.
According to one preferred embodiment of the present invention, the relationship between the bending stress and the life expectancy is：Ln(A)
=-Ln (t)/n+Ln (C).
According to one preferred embodiment of the present invention, the breakdown strength Normal Distribution.
According to one preferred embodiment of the present invention, the maximum curvature is obtained by the means that simulation analysis and mathematics are inserted point.
Beneficial effects of the present invention are：The service life of liquid crystal display panel and estimating for maximum curvature under curved surface state provided by the invention
Calculation method by experiment and mathematical theory, establishes the life prediction method of the liquid crystal display panel under curved surface state.By to short-term
With estimating for long term life, the life cycle of product is disclosed；On the other hand, it can be fixed time down, permitted according to this method, counter be pushed to
Perhaps under fragmentation ratio, the bending stress of liquid crystal display panel and curvature at this time, and then conducive to exploring under the requirement of certain life time
Maximum curvature design value, the design of guide product.The acquisition of these data undoubtedly improves the reliability of product.
Description of the drawings
It, below will be to embodiment or the prior art in order to illustrate more clearly of embodiment or technical solution of the prior art
Attached drawing is briefly described needed in description, it should be apparent that, the accompanying drawings in the following description is only some invented
Embodiment, for those of ordinary skill in the art, without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the evaluation method flow chart in the service life of liquid crystal display panel under curved surface state provided by the invention；
Fig. 2 is the distribution map of the breakdown strength for the different fragment rate lower glass substrates that experiment obtains；
Fig. 3 is the evaluation method flow chart of the maximum curvature of liquid crystal display panel under curved surface state provided by the invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes.Obviously, described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, the every other implementation that those skilled in the art are obtained without creative efforts
Example, shall fall within the protection scope of the present invention.
Be discussed in detail below in conjunction with the accompanying drawings the specific embodiment of the invention offer curved surface state under liquid crystal display panel service life and
The evaluation method of maximum curvature.
The present invention proposes liquid crystal display panel under curved surface state for tired benefit of the curved surface state liquid crystal display panel under long-time
Service life evaluation method.As shown in Figure 1, it the described method comprises the following steps：
Step S10, bending stress of the glass substrate for being used to prepare liquid crystal display panel under preset curvature is obtained；
Step S11, by carrying out failure test to a series of glass substrates after cutting edging, the glass is obtained
The destruction mean stress of substrate；
Step S12, the breakdown strength of the glass substrate is obtained according to the destruction mean stress；
Step S13, according to the breakdown strength and the bending stress, the longevity of the liquid crystal display panel under curved surface state is estimated
Life.
Specifically, the service life of the liquid crystal display panel is divided into short-term service life and long term life, first passes through ess-strain and measures system
System, acquisition prepare bending stress (A) of the glass substrate of liquid crystal display panel under preset curvature, and the glass substrate can treat group
The glass substrate of liquid crystal display panel is dressed up, then a series of glass substrate after cutting edgings is obtained by practical failure test
Power and maximum stress value during one group of destruction obtain the destruction mean stress (B=70.86Mpa) of glass substrate.According to described broken
Bad mean stress obtains the breakdown strength of the glass substrate.Because of the difference of the glass substrate of selection, the shape of micro-crack
State differs, and the breakdown strength has differences, based on this, it is assumed that the breakdown strength of the glass substrate is obeyed just
State is distributed：σ b~N (70.86,7.84).According to the breakdown strength and the bending stress, institute under curved surface state can be evaluated whether
State the service life of liquid crystal display panel.
Wherein, the estimation in short-term service life is the fragmentation intensity under the different fragment rates by comparing the glass substrate
With the bending stress under certain curvature, estimate when the liquid crystal display panel bends to the curvature and whether destroy.Such as the above method
It is described, wherein the step S13 includes：The breakdown strength of the glass substrate under different fragment rates is obtained, according to institute
Breakdown strength and the bending stress are stated, estimates the liquid crystal display panel when the preset curvature is reached, if is destroyed.Its
In, when the breakdown strength is more than the bending stress, the glass substrate, will not be by when the preset curvature is reached
It destroys, the liquid crystal display panel has the service life of certain time under the preset curvature.I.e. described breakdown strength is less than or equal to institute
When the possibility for stating bending stress is 0, the liquid crystal display panel can reach the preset curvature, and the liquid crystal display panel will not be at once
Rupture.
As shown in Fig. 2, the distribution map of the breakdown strength of different fragment rate lower glass substrates obtained for experiment；Certain bent
Under rate, the breakdown strength of the glass substrate under different fragment rates is in normal distribution.Referring again to the corresponding destruction of different fragmentation ratios
The table of intensity, the table are as follows：
| Breakdown strength C | Allow fragmentation ratio |
| C=52.8Mpa | 1.0% |
| C=46.7Mpa | 0.1% |
| C=29.1Mpa | 3ppm |
It now using thickness of glass substrate as 0.4T/0.5T, illustrates, is measured in design curvature for radius of curvature R 1800
Under, bending stress A is respectively 29.1Mpa and 24.9Mpa, according to normal distribution σ b~N (70.86,7.84), obtains different fragmentations
Breakdown strength C under rate.Wherein, the breakdown strength C is less than or equal to the possibility about 3ppm of the bending stress A, close to 0,
Therefore, when liquid crystal display panel bends to the design curvature, the possibility of the liquid crystal display panel horse back fragmentation is very low.
The estimation of long term life is after glass substrate bends to preset curvature, how long can be ruptured afterwards.With the time
Increase, the fatigue effect of the glass substrate shows, and breakdown strength C can (service life t) increases and reduces, and works as reduction with the time
To rupture will be generated during bending stress.The estimation of long term life, as described in the above method, wherein, the step S13 packets
It includes：According to the breakdown strength and the bending stress and the tired factor, obtain the glass substrate and be bent to described default
It is described until rupture time used is the service life of the glass substrate until rupture used time after curvature, i.e., with it is described
The service life of the consistent liquid crystal display panel of glass substrate parameter.
According to bending stress A, the breakdown strength C and the following formula：
Ln (A)=- Ln (t)/n+Ln (C) (1)
Can anti-propulsive liquid crystal panel long term life t, wherein, n is the tired factor.Using thickness of glass substrate as 0.4T/0.5T,
It is illustrated for radius of curvature R 1800, the service life estimated using the method please refers to following table：
In addition, the present invention also provides a kind of evaluation method of the maximum curvature of liquid crystal display panel under curved surface state, such as Fig. 3 institutes
Show, the described method comprises the following steps：
Step S20, acquisition prepares breakdown strength of the glass substrate of liquid crystal display panel under different fragment rates；
Step S21, according to life expectancy, in conjunction with the breakdown strength and the tired factor, the glass substrate is obtained
Bending stress；
Step S22, according to the bending stress, maximum curvature of the liquid crystal display panel under the life expectancy is obtained.
Specifically, the step S20 includes the following steps：
Step S201, failure test is carried out to a series of glass substrate after cutting edgings, obtains the glass substrate
Destroy mean stress；
Step S202, it is strong according to destruction of the destruction mean stress acquisition glass substrate under different fragment rates
Degree.
With reference to the evaluation method in the service life of liquid crystal display panel under above-mentioned curved surface state, once the given fragmentation ratio allowed, leads to
Normal distribution is crossed, the breakdown strength C under the ratio can be obtained.According to above-mentioned formula (1), under given time (t), it is known that described
Breakdown strength C can be bent stress A.After obtaining the bending stress A, it can be inserted and graded by simulation analysis and mathematics
Means (I will not elaborate) can obtain the design value of the maximum curvature under certain life time requirement, and thus guide product is set
Meter improves the reliability of product.
The service life of liquid crystal display panel and the evaluation method of maximum curvature under curved surface state provided by the invention, by testing sum number
Theory establishes the life prediction method of the liquid crystal display panel under curved surface state.By being estimated to short-term and long term life, take off
Show the life cycle of product；On the other hand, it can be fixed time down, allowed under fragmentation ratio, liquid crystal surface according to this method, counter be pushed to
The bending stress of plate and curvature at this time, and then conducive to the design value for exploring the maximum curvature under the requirement of certain life time,
The design of guide product.The acquisition of these data undoubtedly improves the reliability of product.
In conclusion although the present invention is disclosed above with preferred embodiment, above preferred embodiment is not to limit
The system present invention, those of ordinary skill in the art without departing from the spirit and scope of the present invention, can make various changes and profit
Decorations, therefore protection scope of the present invention is subject to the range that claim defines.
Claims (10)
1. the evaluation method in the service life of liquid crystal display panel under a kind of curved surface state, which is characterized in that the described method comprises the following steps：
Step S10, bending stress of the glass substrate for being used to prepare liquid crystal display panel under preset curvature is obtained；
Step S11, by carrying out failure test to a series of glass substrates after cutting edging, the glass substrate is obtained
Destruction mean stress；
Step S12, the breakdown strength of the glass substrate is obtained according to the destruction mean stress；
Step S13, according to the breakdown strength and the bending stress, the service life of the liquid crystal display panel under curved surface state is estimated.
2. evaluation method according to claim 1, which is characterized in that the breakdown strength Normal Distribution.
3. evaluation method according to claim 1, which is characterized in that the step S13 includes：Obtain the glass substrate
The breakdown strength under different fragment rates according to the breakdown strength and the bending stress, estimates the liquid crystal display panel
When the preset curvature is reached, if be destroyed.
4. evaluation method according to claim 3, which is characterized in that when the breakdown strength is more than the bending stress,
The liquid crystal display panel will not be destroyed at least when the preset curvature is reached.
5. evaluation method according to claim 1, which is characterized in that the step S13 includes：According to the breakdown strength
With the bending stress and the tired factor, obtain after the glass substrate is bent to the preset curvature until rupture is used
It is time, described until the time used in rupture is the service life of the liquid crystal display panel.
6. the evaluation method of the maximum curvature of liquid crystal display panel under a kind of curved surface state, which is characterized in that the method includes following
Step：
Step S20, acquisition prepares breakdown strength of the glass substrate of liquid crystal display panel under different fragment rates；
Step S21, according to life expectancy, in conjunction with the breakdown strength and the tired factor, the curved of the glass substrate is obtained
Transverse stress；
Step S22, according to the bending stress, maximum curvature of the liquid crystal display panel under the life expectancy is obtained.
7. evaluation method according to claim 6, which is characterized in that the step S20 includes the following steps：
Step S201, failure test is carried out to a series of glass substrate after cutting edgings, obtains the destruction of the glass substrate
Mean stress；
Step S202, breakdown strength of the glass substrate under different fragment rates is obtained according to the destruction mean stress.
8. evaluation method according to claim 6, which is characterized in that between the bending stress and the life expectancy
Relationship is：Ln (A)=- Ln (t)/n+Ln (C).
9. evaluation method according to claim 6, which is characterized in that the breakdown strength Normal Distribution.
10. evaluation method according to claim 6, which is characterized in that the maximum curvature passes through simulation analysis and mathematics
The means divided are inserted to obtain.
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| CN114577451A (en) * | 2022-02-24 | 2022-06-03 | 苏州华星光电技术有限公司 | Method for testing service life of display panel |
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