CN106526920A - Method and device for measuring liquid crystal display compensation film in-plane phase difference values - Google Patents
Method and device for measuring liquid crystal display compensation film in-plane phase difference values Download PDFInfo
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- CN106526920A CN106526920A CN201611252035.XA CN201611252035A CN106526920A CN 106526920 A CN106526920 A CN 106526920A CN 201611252035 A CN201611252035 A CN 201611252035A CN 106526920 A CN106526920 A CN 106526920A
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- 238000000034 method Methods 0.000 title claims abstract description 21
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- 230000008859 change Effects 0.000 claims description 33
- 238000004088 simulation Methods 0.000 claims description 28
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- 239000007788 liquid Substances 0.000 claims description 6
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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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Abstract
The invention discloses a method for measuring liquid crystal display compensation film in-plane phase difference values. The method includes simulating light leakage variation of the different liquid crystal display compensation film in-plane phase difference values; selecting compensation film in-plane phase difference values to be used as standards according to the simulated light leakage variation and acquiring ratio multiples of different compensation film in-plane phase difference values and standard compensation film in-plane phase difference values; fitting relational expressions of the compensation film in-plane phase difference values and light leakage multiples by the aid of the ratio multiples; utilizing liquid crystal display compensation films with known compensation film in-plane phase difference values as standards and measuring light leakage values of the liquid crystal display compensation films; measuring light leakage values of liquid crystal display compensation films with to-be-measured compensation film in-plane phase difference values; acquiring light leakage ratios of the measured light leakage values of the liquid crystal display compensation films with the to-be-measured compensation film in-plane phase difference values to standard light leakage values for measuring compensation film surfaces of liquid crystal displays; substituting the light leakage ratios into the fitted relational expressions of the compensation film in-plane phase difference values and the light leakage multiples to calculate the to-be-measured liquid crystal display compensation film in-plane phase difference values.
Description
Technical field
The present invention relates to phase difference value measurement in technical field of liquid crystal display, more particularly to a kind of liquid crystal display compensation face
Method and device.
Background technology
As the viewing angle of liquid crystal display increases, the contrast of picture is constantly reduced, and the definition of picture declines.This
Be the birefringence of liquid crystal molecule in liquid crystal layer with the viewing angle result that changes of change, carried out using wide viewing angle compensation film
Compensation, can effectively reduce the light leak of dark-state picture, the contrast of picture can be increased substantially in certain visual angle.
The Ro that compensation film has in face the phase difference value Rth face of phase difference value Ro and thickness direction outside, compensation film can affect
To dark-state light leak and the taste of liquid crystal panel, so it is necessary that the Ro to compensating film in display manufacturing process is measured.
The content of the invention
It is an object of the invention to provide phase difference value in a kind of simply lower-cost liquid crystal display compensation face of measurement
Measuring method.
The present invention also provides phase difference value measurement apparatus in a kind of liquid crystal display compensation face.
To achieve these goals, embodiment of the present invention provides following technical scheme：
Phase difference value measuring method in the liquid crystal display compensation face, including,
The light leak change of phase difference value in the different compensation faces of simulation liquid crystal display；
Phase difference value in compensation face is selected as benchmark, to obtain different compensation faces according to the change of the light leak of the simulation
Interior phase difference value compensates the ratio multiple of phase difference value in face with the benchmark；
Phase difference value and light leak multiple proportion formula in compensation face are fitted by the ratio multiple；
Using in known compensation face, the liquid crystal display of phase difference value compensates film as the benefit of the reference measurement liquid crystal display
Repay the light leak value of film；And
In measurement compensation face to be measured, the liquid crystal display of phase difference value compensates the light leak value of film；
Obtain the light leak value and the reference measurement liquid of the liquid crystal display compensation film of phase difference value in measurement compensation face to be measured
The light leak ratio of the light leak value of the compensation face of crystal display；
The light leak ratio is brought in the compensation face for fitting in phase difference value and light leak multiple proportion
Calculate phase difference value in liquid crystal display compensation face to be measured.
Wherein, in the different compensation faces of the simulation liquid crystal display, the light leak change of phase difference value is the optical axis in compensation film
With the optical axis of the polaroid of liquid crystal display in 45 degree of angles under conditions of carry out.
Wherein, in step simulation liquid crystal display compensation face, the light leak change of phase difference value includes, two adjacent
In coplanar, phase difference value is not chosen according to a certain percentage.
Wherein, in the known compensation face of step, the liquid crystal display of phase difference value compensates film as the reference measurement liquid crystal display
The light leak value of compensation film；And the light leak value that the liquid crystal display for compensating phase difference value in face to be measured compensates film is measured, it is to choose
Same backlight.
Wherein, in the step simulation liquid crystal display compensation face, the light leak change of phase difference value includes, to less than liquid crystal
Show that compensation film is simulated phase place in the different compensation faces of liquid crystal display using phase difference value in the compensation face of critical field
The light leak change of difference.
Wherein, simulation compensation face in phase difference value 48nm when, fitting falseface in phase difference value and brightness relationship
Formula is Y=7.5553X3-34.003X2+ 68.327X+7.14, wherein, X is to obtain phase difference value in measurement compensation face to be measured
The light leak ratio of the light leak value of liquid crystal display compensation film and the light leak value of the compensation face of the reference measurement liquid crystal display；Y is
Need to measure phase difference value in compensation face to be measured.
Phase difference value measurement apparatus in liquid crystal display compensation face of the present invention, including,
Analog module, for simulating the light leak change of phase difference value in liquid crystal display compensation face, to choose different compensation
In face, phase difference value is used as benchmark；
First acquisition module, for according to the light leak of the simulation change select compensation face in phase difference value as base
Standard, obtains the ratio multiple that phase difference value and the benchmark in different compensation faces compensate phase difference value in face；
Fitting module, for fitting phase difference value and light leak multiple proportion in compensation face according to the ratio multiple
Formula；
First measurement module, for compensating film as reference measurement using the liquid crystal display of phase difference value in known compensation face
The light leak value of the compensation film of the liquid crystal display；
Second measurement module, the liquid crystal display for measuring phase difference value in compensation face to be measured compensate the light leak value of film；
Second acquisition module, the liquid crystal display for obtaining phase difference value in measurement compensation face to be measured compensate the light leak of film
The light leak ratio of value and the light leak value of the compensation face of the reference measurement liquid crystal display；
Computing module, brings phase difference value and light leak times in the compensation face for fitting into the light leak ratio
The brilliant display of prepare liquid is calculated in number relation and compensates phase difference value in face.
Wherein, by the light leak change of phase difference value in LCD simulation softwares analog compensations film not coplanar.
Wherein, also including measurement turntable, in the known compensation face, the liquid crystal display of phase difference value compensates the base of film
Quasi- side and measure it is to be measured compensation face in phase difference value liquid crystal display compensation film benchmark become with the rotation stage fiducial
While to which, passing through first measurement module and second measurement module in the case of 45 degree of angles of turntable.
Wherein, first measurement module and second measurement module are measured under same backlight.
The embodiment of the present invention has the advantage that or beneficial effect：
The compensation film of the present invention not in coplanar phase difference value Ro measurement equipment and method for measurement.Low cost is measured, fast,
It is conveniently accurate.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is phase difference value measuring method flow chart in liquid crystal display compensation face of the present invention；
Fig. 2 is to simulate the different compensation films of liquid crystal display in liquid crystal display compensation face of the present invention in phase difference value measuring method
The light leak variation diagram of phase difference value in face；
Fig. 3 is the light leak change Central Shanxi Plain R0=so that phase difference value in the different compensation faces of liquid crystal display is simulated described in Fig. 2
Phase difference value and multiple proportion figure in compensation face on the basis of 12nm；
Fig. 4 is the light leak change Central Shanxi Plain R0=so that phase difference value in the different compensation faces of liquid crystal display is simulated described in Fig. 2
Phase difference value and multiple proportion figure in compensation face on the basis of 48nm；
Fig. 5 is the light leak change Central Shanxi Plain R0=so that phase difference value in the different compensation faces of liquid crystal display is simulated described in Fig. 2
Phase difference value and multiple proportion figure in compensation face on the basis of 84nm；
Fig. 6 is the light leak change Central Shanxi Plain R0=so that phase difference value in the different compensation faces of liquid crystal display is simulated described in Fig. 2
Phase difference value and multiple proportion figure in compensation face on the basis of 120nm；
Fig. 7 is the light leak change Central Shanxi Plain R0=so that phase difference value in the different compensation faces of liquid crystal display is simulated described in Fig. 2
Phase difference value and multiple proportion figure in compensation face on the basis of 180nm；
Fig. 8 is in liquid crystal display compensation face of the present invention in phase difference value measuring method, according to working standard R0 values in R0
The light leak variation diagram of phase difference value in the different compensation faces of a small range simulation liquid crystal display；
Fig. 9 is the light leak change Central Shanxi Plain R0=so that phase difference value in the different compensation faces of liquid crystal display is simulated described in Fig. 8
Phase difference value and multiple proportion figure in compensation face on the basis of 48nm；
Figure 10 is that the liquid crystal display liquid crystal of the present invention measures apparatus module figure.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment a part of embodiment only of the invention, rather than the embodiment of whole.Base
Embodiment in the present invention, it is all that those of ordinary skill in the art are obtained on the premise of creative work is not made
Other embodiments, belong to the scope of protection of the invention.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or detachably connected, or integratedly connect
Connect；Can be mechanically connected；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion.For the ordinary skill in the art, above-mentioned term tool in the present invention can be understood with concrete condition
Body implication.
Fig. 1 is referred to, first embodiment of the invention provides phase difference value measuring method in the liquid crystal display compensation face,
Including,
Refering to figure Fig. 2, step S1, the light leak change of phase difference value in the different compensation faces of liquid crystal display is simulated；This step
Phase difference value and the relation curve of light leak (brightness) in different compensation faces are obtained, phase contrast in face wherein in abscissa, is compensated
Carrying out according to a certain percentage choosing simulation between value；In the present embodiment, it is preferred that the simulation steps are the light in compensation film
The optical axis of axle and the polaroid of liquid crystal display in 45 degree of angles under conditions of carry out, it is corresponding to obtain phase difference value in not coplanar
Brightness value.In other embodiments, the simulation steps are the optical axises of the optical axis in compensation film and the polaroid of liquid crystal display
Can be other angles.
Step S2, selects phase difference value in compensation face as benchmark, to obtain different according to the change of the light leak of the simulation
In compensation face, phase difference value and the benchmark compensate the ratio multiple of phase difference value in face；Refering to Fig. 3, with phase contrast in face
On the basis of value R0=12nm, ratio multiple, such as Fig. 3 abscissas are determined.The abscissa of Fig. 2 is referred to, in other embodiments,
In face, the value of phase difference value R0 can be 24nm, 48nm, 84nm, 120nm and 180nm.
Such as Fig. 3, step S3, phase difference value and light leak multiple proportion in compensation face are fitted by the ratio multiple
Formula；On the basis of R0=12nm, fitting formula is Y=0.00003561X to the present embodiment3-0.01137048X2+1.95339053X
+16.4.Wherein Y is phase difference value in compensation face, and X is ratio multiple.
Step S4, using in known compensation face, the liquid crystal display of phase difference value compensates film as the reference measurement liquid crystal display
Light leak value Lv1 of compensation film.
Step S5, the liquid crystal display for measuring phase difference value in compensation face to be measured compensate light leak value Lv2 of film.Wherein, walk
In rapid known compensation face, the liquid crystal display compensation film of phase difference value is used as the compensation face of the reference measurement liquid crystal display
Light leak value；And the light leak value that the liquid crystal display for compensating phase difference value in face to be measured compensates film is measured, it is to choose same backlight.
Used in step S4 with step S5, measuring apparatus include turntable, the object stage for being provided with true edge and brightness measurement
Instrument, it is known that the liquid crystal display compensation film of the phase difference value liquid crystal that compensate face in phase difference value to be measured with measurement in compensation face
Show that compensation film is put on the object stage of true edge and with true edge respectively to which, light is by object stage through after the compensation film
Into the brightness measurer.
Step S6, the light leak value for obtaining the liquid crystal display compensation film of phase difference value in measurement compensation face to be measured are surveyed with benchmark
Measure the light leak ratio of the light leak value of the compensation face of the liquid crystal display；The namely ratio of Lv2 and Lv1.
Step S7, brings phase difference value and light leak multiple in the compensation face for fitting into the light leak ratio
The brilliant display of prepare liquid is calculated in relational expression and compensates phase difference value in face.Relational expression is described Y=0.00003561X3-
0.01137048X2+1.95339053X+16.4。
On the basis of the present embodiment step S2, respectively with the value of phase difference value R0 in face as 48nm, 84nm, 120nm and
180nm is fitted and is compensated phase difference value and light leak multiple proportion formula in face.It is specific as follows：
As shown in figure 4, when the value of R0 is 48nm, being fitted phase difference value formula in the corresponding compensation face for obtaining is：Y
=0.13405X3-2.75169X2+30.38781X+16.4。
As shown in figure 5, when the value of R0 is 84nm, being fitted phase difference value formula in the corresponding compensation face for obtaining is：Y
=3.3009X3-23.29X2+88.407X+16.4。
As shown in fig. 6, when the value of R0 is 120nm, being fitted phase difference value formula in the corresponding compensation face for obtaining is：
Y=21.69366X3-81.71592X2+165.59725X+16.4。
As shown in fig. 7, when the value of R0 is 180nm, being fitted phase difference value formula in the corresponding compensation face for obtaining is：
Y=134.831X3-276.235X2+304.466X+16.4.Wherein, wherein Y is phase difference value in compensation face, and X is ratio times
Number.
Fig. 8 is referred to, further, the light leak change bag of phase difference value in the step simulation liquid crystal display compensation face
Include, mend to phase difference value simulation liquid crystal display difference in compensation face of the film using critical field being compensated less than liquid crystal display
Repay the light leak change of phase difference value in face.In common compensation face phase difference value typically in 50nm, this method with 50nm
Be with reference to in the compensation face of phase difference value in the face of a small range phase difference value measure.
Refer to Fig. 9 specifically, on the basis of phase difference value 48nm in the compensation face of simulation, obtained by said method
Phase difference value 48nm and phase difference value ratio multiple in not coplanar in compensation face.Then be fitted falseface in phase difference value with it is bright
Degree relational expression is Y=7.5553X3-34.003X2+ 68.327X+7.14, wherein, to obtain, measurement is to be measured to compensate phase place in face to X
The light leak value of the liquid crystal display compensation film of difference and the light leak ratio of the light leak value of the compensation face of the reference measurement liquid crystal display
Value；Y be less than critical field compensation face in phase difference value compensation face to be measured in phase difference value.In the present embodiment, mend
The ratio for repaying phase difference value in different compensation faces on the abscissa in face on the basis of phase difference value 48nm is less, such as 4.8,
9.6。
Figure 10 is referred to, liquid crystal display of the present invention compensates phase difference value measurement apparatus in face, including,
Simulation mould 10, for simulating the light leak change of phase difference value in liquid crystal display compensation face, to choose different compensation
In face, phase difference value is used as benchmark；
First acquisition module 20, for according to the light leak of the simulation change select compensation face in phase difference value as base
Standard, obtains the ratio multiple that phase difference value and the benchmark in different compensation faces compensate phase difference value in face；
Fitting module 30, for fitting phase difference value and light leak multiple proportion in compensation face according to the ratio multiple
Formula；
First measurement module 40, surveys as benchmark for compensating film using the liquid crystal display of phase difference value in known compensation face
Measure the light leak value of the compensation film of the liquid crystal display；
Second measurement module 50, the liquid crystal display for measuring phase difference value in compensation face to be measured compensate the light leak of film
Value；
Second acquisition module 60, the liquid crystal display for obtaining phase difference value in measurement compensation face to be measured compensate the leakage of film
The light leak ratio of light value and the light leak value of the compensation face of the reference measurement liquid crystal display；
Computing module 70, brings phase difference value and light leak in the compensation face for fitting into the light leak ratio
The brilliant display of prepare liquid is calculated in multiple proportion and compensates phase difference value in face.
Wherein, by the light leak change of phase difference value in LCD simulation softwares analog compensations film not coplanar.
Wherein, also including measurement turntable, in the known compensation face, the liquid crystal display of phase difference value compensates the base of film
Quasi- side and measure it is to be measured compensation face in phase difference value liquid crystal display compensation film benchmark become with the rotation stage fiducial
While to which, passing through first measurement module and second measurement module in the case of 45 degree of angles of turntable.
Wherein, first measurement module and second measurement module are measured under same backlight.
In the present embodiment, the light leak change of phase difference value in different compensation faces is simulated by LCD simulation softwares.Tool
Body is LCD Master.
The compensation film of the present invention not in coplanar phase difference value Ro measurement equipment and method for measurement.Low cost is measured, fast,
It is conveniently accurate.
Embodiments described above, does not constitute the restriction to the technical scheme protection domain.It is any in above-mentioned enforcement
Modification, equivalent and improvement made within the spirit and principle of mode etc., should be included in the protection model of the technical scheme
Within enclosing.
Claims (10)
1. a kind of liquid crystal display compensates phase difference value measuring method in face, it is characterised in that include,
The light leak change of phase difference value in the different compensation faces of simulation liquid crystal display；
Phase difference value in compensation face is selected as benchmark, to obtain phase in different compensation faces according to the change of the light leak of the simulation
Potential difference value compensates the ratio multiple of phase difference value in face with the benchmark；
Phase difference value and light leak multiple proportion formula in compensation face are fitted by the ratio multiple；
Using in known compensation face, the liquid crystal display of phase difference value compensates film as the leakage of reference measurement liquid crystal display compensation film
Light value；And
In measurement compensation face to be measured, the liquid crystal display of phase difference value compensates the light leak value of film；
Obtain the light leak value and the reference measurement liquid crystal of the liquid crystal display compensation film of phase difference value in measurement compensation face to be measured
Show the light leak ratio of the light leak value of the compensation face of device；
The light leak ratio is brought into phase difference value in the compensation face for fitting to fall into a trap with light leak multiple proportion formula
Calculate phase difference value in liquid crystal display compensation face to be measured.
2. liquid crystal display as claimed in claim 1 compensates phase difference value measuring method in face, it is characterised in that the simulation
The light leak change of phase difference value in the different compensation faces of liquid crystal display is the polaroid of the optical axis in compensation film and liquid crystal display
Optical axis in carrying out under conditions of 45 degree of angles.
3. liquid crystal display as claimed in claim 1 compensates phase difference value measuring method in face, it is characterised in that the step
The light leak change of phase difference value in simulation liquid crystal display compensation face includes that phase difference value is according to one in two adjacent not coplanars
Certainty ratio is chosen.
4. liquid crystal display as claimed in claim 1 compensates phase difference value measuring method in face, it is characterised in that known to step
The light leak value that compensate face of the liquid crystal display compensation film of phase difference value as the reference measurement liquid crystal display in compensation face；
And the light leak value that the liquid crystal display for compensating phase difference value in face to be measured compensates film is measured, it is to choose same backlight.
5. liquid crystal display as claimed in claim 3 compensates phase difference value measuring method in face, it is characterised in that the step
The light leak change of phase difference value in simulation liquid crystal display compensation face includes, to using critical field less than liquid crystal display compensation film
Compensation face in phase difference value be simulated the light leak change of phase difference value in the different compensation face of liquid crystal display.
6. liquid crystal display as claimed in claim 5 compensates phase difference value measuring method in face, it is characterised in that in simulation
In compensation face during phase difference value 48nm, in fitting falseface, phase difference value and brightness relationship formula are Y=7.5553X3-
34.003X2+ 68.327X+7.14, wherein, X is the liquid crystal display compensation film for obtaining phase difference value in measurement compensation face to be measured
Light leak value and the light leak value of the compensation face of the reference measurement liquid crystal display light leak ratio；Y is to need to measure benefit to be measured
Repay phase difference value in face.
7. a kind of liquid crystal display compensates phase difference value measurement apparatus in face, it is characterised in that include,
Analog module, for simulating the light leak change of phase difference value in liquid crystal display compensation face, to choose different compensation faces
Interior phase difference value is used as benchmark；
First acquisition module, for selecting phase difference value in compensation face as benchmark, to obtain according to the change of the light leak of the simulation
Take the ratio multiple that phase difference value and the benchmark in different compensation faces compensate phase difference value in face；
Fitting module, for fitting phase difference value and light leak multiple proportion formula in compensation face according to the ratio multiple；
First measurement module, for compensating film as the reference measurement liquid using the liquid crystal display of phase difference value in known compensation face
The light leak value of the compensation film of crystal display；
Second measurement module, the liquid crystal display for measuring phase difference value in compensation face to be measured compensate the light leak value of film；
Second acquisition module, for obtain measurement it is to be measured compensation face in phase difference value liquid crystal display compensation film light leak value with
The light leak ratio of the light leak value of the compensation face of the reference measurement liquid crystal display；
Computing module, brings phase difference value and light leak multiple pass in the compensation face for fitting into the light leak ratio
The brilliant display of prepare liquid is calculated in system and compensates phase difference value in face.
8. liquid crystal display as claimed in claim 6 compensates phase difference value measurement apparatus in face, it is characterised in that by LCD
Simulation softwares analog compensation film not in coplanar phase difference value light leak change.
9. liquid crystal display as claimed in claim 6 compensates phase difference value measurement apparatus in face, it is characterised in that also including survey
Amount turntable, the true edge and measurement compensation film to be measured of the liquid crystal display compensation film of phase difference value in the known compensation face
In face, the benchmark of the liquid crystal display compensation film of phase difference value becomes with the turntable true edge to which, in 45 degree of angle feelings of turntable
Pass through first measurement module and second measurement module under condition.
10. phase difference value measurement apparatus in liquid crystal display as claimed in claim 6 compensation face, it is characterised in that described the
One measurement module is to measure under same backlight with second measurement module.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107085320A (en) * | 2017-04-14 | 2017-08-22 | 深圳市华星光电技术有限公司 | A kind of measuring method of liquid crystal panel optical path difference |
| CN111025727A (en) * | 2019-12-30 | 2020-04-17 | 上海天马微电子有限公司 | Display device and preparation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107085320A (en) * | 2017-04-14 | 2017-08-22 | 深圳市华星光电技术有限公司 | A kind of measuring method of liquid crystal panel optical path difference |
| CN107085320B (en) * | 2017-04-14 | 2020-02-07 | 深圳市华星光电技术有限公司 | Method for measuring optical path difference of liquid crystal panel |
| CN111025727A (en) * | 2019-12-30 | 2020-04-17 | 上海天马微电子有限公司 | Display device and preparation method thereof |
| CN111025727B (en) * | 2019-12-30 | 2022-05-06 | 上海天马微电子有限公司 | Display device and preparation method thereof |
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