CN114740661A - Preparation method of liquid crystal panel and display panel - Google Patents
Preparation method of liquid crystal panel and display panel Download PDFInfo
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- CN114740661A CN114740661A CN202210377255.4A CN202210377255A CN114740661A CN 114740661 A CN114740661 A CN 114740661A CN 202210377255 A CN202210377255 A CN 202210377255A CN 114740661 A CN114740661 A CN 114740661A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 291
- 238000002360 preparation method Methods 0.000 title abstract description 10
- 239000000758 substrate Substances 0.000 claims abstract description 163
- 238000005452 bending Methods 0.000 claims abstract description 96
- 230000003287 optical effect Effects 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 30
- 238000002834 transmittance Methods 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000005286 illumination Methods 0.000 claims description 2
- 230000000875 corresponding effect Effects 0.000 description 35
- 230000005684 electric field Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 14
- 230000003247 decreasing effect Effects 0.000 description 13
- 230000008569 process Effects 0.000 description 10
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- 230000002596 correlated effect Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
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- 238000009281 ultraviolet germicidal irradiation Methods 0.000 description 1
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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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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Abstract
The application provides a preparation method of a liquid crystal panel and a display panel. The preparation method of the liquid crystal display panel specifically comprises the following steps: providing a display panel, wherein the display panel comprises a first substrate, a second substrate and a liquid crystal layer, and the first substrate is positioned on one side of the liquid crystal layer, which is deviated from the second substrate; setting a pretilt angle of liquid crystals in the liquid crystal layer; carrying out optical alignment on the display panel to ensure that a second pretilt angle of liquid crystal close to the first substrate and the second substrate in the liquid crystal layer is fixed; the display panel is bent. The display panel obtained by the preparation method of the liquid crystal panel not only ensures that the liquid crystal in the liquid crystal layer is well converged, but also avoids the dark fringe phenomenon of the display panel; but also avoids the problem that the bending part of the display panel has dark clusters.
Description
Technical Field
The invention relates to the technical field of display, in particular to a preparation method of a liquid crystal panel and a display panel.
Background
With the continuous development of Liquid Crystal Display technology, Thin Film Transistor-Liquid Crystal displays (TFT-LCDs) gradually become the mainstream of Display panels, especially curved-surface LCDs, and are increasingly popular among people due to their good viewing angle and large size.
At present, a TFT-LCD mainly includes an array substrate, a color filter substrate, and a Liquid Crystal Layer (LC) disposed between the array substrate and the color filter substrate. One of the commonly used liquid crystal display modes of the TFT-LCD is a Vertical Alignment (VA) mode, which has been widely used by liquid crystal display products due to its characteristics of high contrast and fast response time.
However, when the display panel is photo-aligned, not only the problem of dark fringes of the display panel due to poor liquid crystal convergence is easily caused, but also the problem of dark fringes caused by the change of the pretilt angle of the liquid crystal molecules due to the stress action of the substrate at the bent portion on the liquid crystal molecules in the process of bending the display panel after the photo-alignment of the display panel is completed is caused.
Disclosure of Invention
The application provides a preparation method of a liquid crystal panel and the display panel, and aims to solve the problems that when the display panel is subjected to optical alignment, poor liquid crystal convergence easily occurs, so that dark fringes occur on the display panel, and the pretilt angle of liquid crystal molecules is changed under the stress action of a substrate at the bent part of the display panel, so that the light transmittance at the part is reduced, and a dark cluster occurs.
In order to solve the above problems, the present application adopts a technical solution that: a method for manufacturing a liquid crystal display panel is provided. The preparation method of the liquid crystal display panel specifically comprises the following steps:
and providing a display panel, wherein the display panel comprises a first substrate, a second substrate and a liquid crystal layer, and the first substrate is positioned on one side of the liquid crystal layer departing from the second substrate.
Setting a pretilt angle of liquid crystals in the liquid crystal layer; wherein the setting of the pretilt angle of the liquid crystal in the liquid crystal layer includes:
applying a first alignment voltage between the first substrate and the second substrate, increasing the first alignment voltage to a second alignment voltage within a first preset time, and keeping the second alignment voltage constant for a second preset time, so that liquid crystals in the liquid crystal layer deflect to a first pretilt angle;
reducing the second alignment voltage to a ground third alignment voltage in a third preset time, and keeping the third alignment voltage constant for a fourth preset time so that the liquid crystal in the liquid crystal layer deflects to a second pretilt angle; wherein the second pretilt is less than the first pretilt;
and carrying out optical alignment on the display substrate, so that a second pretilt angle of liquid crystal close to the first substrate and the second substrate in the liquid crystal layer is fixed.
Bending the display panel.
The range of the first alignment voltage is 0-12V, the range of the second alignment voltage is 14-18V, and the range of the third alignment voltage is 10-12V.
The first preset time is 40-70s, the second preset time is 5-20s, the third preset time is 5-10s, and the fourth preset time is 3-10 s.
Wherein, in the step of increasing the first alignment voltage to the second alignment voltage in the first preset time, the first alignment voltage is increased to the second alignment voltage in a multi-step manner.
In the step of reducing the second alignment voltage to a third alignment voltage for a third predetermined time, the second alignment voltage is reduced to the third alignment voltage in a multi-step manner.
Wherein the bending the display panel comprises: and integrally bending the display panel to form a curved plate.
The step of setting the pretilt angle of the liquid crystal in the liquid crystal layer further comprises the following steps of: and dividing the display panel into a plurality of bending areas according to the bending degree of the curved panel.
The step of setting the pretilt angle of the liquid crystal in the liquid crystal layer includes:
and applying the first alignment voltage between the first substrate and the second substrate in the plurality of bending areas, increasing the first alignment voltage to the second alignment voltage in the first preset time, and keeping the second alignment voltage constant for the second preset time, so that the liquid crystal in the liquid crystal layer deflects to the first pretilt angle.
In the plurality of bending areas, the second alignment voltage is reduced to the third alignment voltage in the third preset time, and the third voltage is constantly kept for the fourth preset time, so that liquid crystals in the liquid crystal layer are deflected to the second pretilt angle; wherein the magnitude of the third alignment voltage is inversely related to the bending degree of the bending region corresponding to the third alignment voltage, and the magnitude of the second pretilt angle is positively related to the third alignment voltage of the bending region corresponding to the second pretilt angle.
Wherein the bending the display panel includes: the display panel portion is bent to form a curved surface portion, and the non-bent portion is kept as a flat surface portion.
The step of setting the pretilt angle of the liquid crystal in the liquid crystal layer further comprises the following steps of: and dividing the display panel into a bending area and a non-bending area according to the curved surface part and the plane part.
The step of setting a pretilt angle of liquid crystals in the liquid crystal layer includes:
and applying the first alignment voltage between the first substrate and the second substrate in the bending region and the non-bending region, increasing the first alignment voltage to the second alignment voltage in the first preset time, and keeping the second alignment voltage constant for the second preset time, so that the liquid crystal in the liquid crystal layer reaches the first pretilt angle.
In the bending area, reducing the second alignment voltage to a third alignment voltage within the third preset time, and keeping the third voltage constant for a fourth preset time, so that liquid crystals in the liquid crystal layer reach the second pretilt angle; wherein the second pretilt is less than the first pretilt.
The step of optically aligning the display panel to fix a second pretilt angle of the liquid crystal close to the first substrate and the second substrate in the liquid crystal layer specifically includes:
a first pretilt angle of liquid crystal near the first substrate and near the second substrate in the liquid crystal layer of the non-bending region is fixed, and a second pretilt angle of liquid crystal near the first substrate and near the second substrate in the liquid crystal layer of the bending region is fixed.
The optically aligning the display panel to fix a second pretilt angle of the liquid crystal close to the first substrate and the second substrate in the liquid crystal layer specifically includes:
in the step of applying alignment voltage between the first substrate and the second substrate, performing first ultraviolet irradiation simultaneously so that a second pretilt angle of liquid crystal close to the first substrate and the second substrate in the liquid crystal layer is fixed.
Wherein the step of photoaligning the display panel such that a second pretilt angle of liquid crystals in the liquid crystal layer near the first substrate and near the second substrate is fixed further comprises:
carrying out secondary ultraviolet illumination on the display panel; and the time or the intensity of the second ultraviolet irradiation is greater than that of the first ultraviolet irradiation.
In order to solve the above technical problem, the second technical solution adopted by the present application is: a display panel is provided. At least part bending type of display panel forms the kink, includes: the liquid crystal display panel comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate is positioned on one side of the liquid crystal layer, which is far away from the second substrate; wherein, the light penetration rate of the liquid crystal layer of the bending part is more than 20%.
In order to solve the above technical problem, the third technical solution adopted by the present application is: a display panel is provided. The display panel is prepared by the preparation method of the liquid crystal panel.
According to the preparation method of the liquid crystal panel and the display panel, a first alignment voltage is applied between a first substrate and a second substrate, the first alignment voltage is increased to a second alignment voltage within a first preset time, so that a convergent electric field is formed between the first substrate and the second substrate, the second alignment voltage is constantly kept for a second preset time, so that the convergent electric field formed between the first substrate and the second substrate is kept for a second preset time, and liquid crystals in a liquid crystal layer are deflected to a first pretilt angle in the electric field; meanwhile, in the second preset time, the liquid crystal in the liquid crystal layer can be fully converged in the convergent electric field, so that the problem that the light transmittance is reduced due to poor convergence of part of the liquid crystal in the liquid crystal layer to cause the display panel to generate dark fringes is avoided. And, by reducing the second alignment voltage to a third alignment voltage for a third predetermined time to form an alignment electric field between the first substrate and the second substrate, and maintaining the third alignment voltage constant for a fourth predetermined time, so that the alignment electric field formed between the first substrate and the second substrate is maintained for a fourth predetermined time, and the liquid crystal in the liquid crystal layer is deflected to a second pretilt angle in the electric field, wherein the second pretilt angle is smaller than the first pretilt angle, thereby reducing the molecular acting force between the liquid crystals, so that in the process of bending the display panel, the smaller second pretilt angle of the liquid crystals in the liquid crystal layer has a space for overcoming the stress action of the substrate to deflect, and the smaller molecular acting force between the liquid crystals ensures that the arrangement change of the liquid crystal molecules is smaller, therefore, the problem that dark clusters appear in the bending area of the display panel due to the reduction of the light transmittance of the liquid crystal layer is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic flow chart illustrating a method for fabricating a liquid crystal panel according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of the display panel formed in step S10 in fig. 1;
FIG. 3 is a flowchart illustrating an embodiment of step S20 in FIG. 1;
FIG. 4 is a waveform diagram illustrating the alignment voltage applied in the first embodiment of step S20 in FIG. 1;
FIG. 5a is a schematic diagram illustrating a state of liquid crystal in the liquid crystal layer during a first predetermined time period shown in FIG. 4;
FIG. 5b is a schematic diagram illustrating a state of liquid crystal in the liquid crystal layer during a second predetermined time period shown in FIG. 4;
FIG. 5c is a schematic diagram showing the states of liquid crystals in the liquid crystal layer during the third predetermined time and the fourth predetermined time of FIG. 4;
FIG. 5d is a schematic view showing the state of liquid crystals in the liquid crystal layer after photo-alignment of the display panel;
fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure before and after bending;
fig. 7 is a schematic structural diagram of a display panel according to another embodiment of the present application before and after bending;
fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present application.
Reference numbers:
100-a display panel; 10-a first substrate; 20-a second substrate; 30-a liquid crystal layer; u1 — first alignment voltage; u2 — second preset voltage; u3-third preset voltage; t 1-first preset time; t 2-second preset time; t 3-third preset time; t 4-fourth preset time; α 1 — first pretilt; α 2-second pretilt; 101/102/103-bending region; 101a/102a/103 a-curved surface portion; 104-a non-bent region; 105-a bending region; 104 a-planar portion; 105 a-curved face; 106-bending part.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The terms "first", "second" and "third" in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise. All directional indications (such as up, down, left, right, front, and rear … …) in the embodiments of the present application are only used to explain the relative positional relationship between the components, the movement, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The present application will be described in detail with reference to the drawings and examples.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic flow chart of an embodiment of a method for manufacturing a liquid crystal panel of the present application, and fig. 2 is a schematic structural view of a display panel formed in step S10 in fig. 1; in this embodiment, the method for manufacturing a liquid crystal panel includes:
s10: a display panel 100 is provided, the display panel 100 includes a first substrate 10, a second substrate 20 and a liquid crystal layer 30, the first substrate 10 is located on a side of the liquid crystal layer 30 away from the second substrate 20.
In this embodiment, the display panel 100 is a pair-cell display panel 100, and after the cell pair process is completed, the first substrate 10 and the second substrate 20 are cut to form the display panel 100, and the pins on the first substrate 10 and the second substrate 20 are exposed to align the liquid crystal layer 30 in the following process. Specifically, the first substrate 10 may be a Thin Film Transistor (TFT) array substrate, and the second substrate 20 may be a color filter substrate, or the first substrate 10 may be a color filter substrate, and the second substrate 20 may be a TFT array substrate.
S20: the pretilt angle of the liquid crystal in the liquid crystal layer 30 is set.
In the present embodiment, by setting the pre-tilt angle of the liquid crystal in the liquid crystal layer 30, the liquid crystal molecules in the liquid crystal layer 30 are changed from the original disordered and disordered arrangement state to the ordered arrangement state with the preset deflection angle, so that the light beam can penetrate through the liquid crystal layer 30, and the display panel 100 displays an image.
Referring to fig. 3, fig. 3 is a schematic flowchart illustrating an embodiment of step S20 in the present disclosure; in this embodiment, setting the pretilt angle of the liquid crystal in the liquid crystal layer 30 specifically includes the steps of:
s21: the first alignment voltage U1 is applied between the first substrate 10 and the second substrate 20, the first alignment voltage U1 is increased to the second alignment voltage U2 for a first preset time t1, and the second alignment voltage U2 is kept constant for a second preset time t2, so that the liquid crystal in the liquid crystal layer 30 is deflected to the first pretilt angle α 1.
Referring to fig. 4 to 5b, fig. 4 is a waveform diagram illustrating the application of the alignment voltage in the step S20 in fig. 1, fig. 5a is a diagram illustrating a state of the liquid crystal in the liquid crystal layer 30 within the first predetermined time t1 in fig. 4, and fig. 5b is a diagram illustrating a state of the liquid crystal in the liquid crystal layer 30 within the second predetermined time t2 in fig. 4; in this embodiment, the first alignment voltage U1 is applied between the first substrate 10 and the second substrate 20, particularly, through the exposed pins of the first substrate 10 and the second substrate 20. Then, the first alignment voltage U1 is raised to the second alignment voltage U2 for a first predetermined time t1, so as to form a convergent electric field between the first substrate 10 and the second substrate 20; then, the second alignment voltage U2 is constantly maintained for a second predetermined time t2, so that the convergent electric field formed between the first substrate 10 and the second substrate 20 is maintained for a second predetermined time t2, and in the electric field, the liquid crystal in the liquid crystal layer 30 is deflected to the first pretilt angle α 1 in the electric field; meanwhile, in the second preset time t2, the liquid crystal in the liquid crystal layer 30 can be sufficiently converged in the convergent electric field, so as to avoid the problem that the light transmittance of part of the liquid crystal in the liquid crystal layer 30 is reduced due to poor convergence, which causes the occurrence of dark fringes in the display panel 100.
Specifically, the first alignment voltage U1 ranges from 0 to 12V, the first predetermined time t1 may range from 40 to 70s, the second alignment voltage U2 ranges from 14 to 18V, and the second predetermined time t2 may range from 5 to 20 s. In a specific embodiment, the first alignment voltage U1, the first predetermined time t1, the second alignment voltage U2, and the second predetermined time t2 may be selected within the above range according to actual requirements, which is not limited in the present application. For example, in one embodiment, it is preferable that the first alignment voltage U1 is 2V, the first predetermined time t1 is 60s, the second alignment voltage U2 is 16V, and the second predetermined time t2 is 10 s; that is, the first alignment voltage U1 of 2V is applied between the first and second substrates 10 and 20 through the pins exposed from the first and second substrates 10 and 20, and then the first alignment voltage U1 is increased to 16V for 60s, and then is constantly maintained for 10 s.
In one embodiment, in the step of increasing the first alignment voltage U1 to the second alignment voltage U2 at the first preset time t1, the first alignment voltage U1 is increased to the second alignment voltage U2 in a multi-step manner; the multi-step rising scheme allows the first alignment voltage U1 to remain constant for a short period of time during each step, allowing sufficient response time for the liquid crystals in the liquid crystal layer 30 to deflect. The number of steps, the holding time of each step and the rising amount of the voltage rising from one step to the next step can be set according to actual requirements; specifically, the holding time of each step may be the same or different, and the rise amount of the voltage from one step to the next step may be the same or different; that is, in the process of increasing the first alignment voltage U1 to the second alignment voltage U2 in a multi-step manner, the first alignment voltage U1 may be increased in a uniform amount in a multi-step manner, or may be increased in a non-uniform manner in a multi-step manner, which is not limited in the present application.
In this embodiment, the initial value of the first alignment voltage U1 is 2V, the first predetermined time t1 is 60s, and the second alignment voltage U2 is 16V; the first alignment voltage U1 is raised in six steps from 2V to 16V at a time of 60 s; wherein, the holding time of each step is 10s, and the voltage of each step is increased by 2.8V when reaching the next step, and finally the first alignment voltage U1 is increased to 16V to complete the step, so that a convergent electric field is formed between the first substrate 10 and the second substrate 20, and the liquid crystal can be fully converged while being deflected.
S22: decreasing the second alignment voltage U2 to a third alignment voltage U3 for a third preset time t3, and constantly maintaining the third alignment voltage U3 for a fourth preset time t4, so that the liquid crystal in the liquid crystal layer 30 is deflected to a second pretilt angle α 2; wherein the second pretilt α 2 is smaller than the first pretilt α 1.
Referring to fig. 4 and 5c, fig. 5c is a schematic diagram illustrating a state of liquid crystal in the liquid crystal layer 30 within the third predetermined time t3 and the fourth predetermined time t4 in fig. 4; in the present embodiment, the second alignment voltage U2 is lowered to the third alignment voltage U3 for a third predetermined time t3, so as to form an alignment electric field between the first substrate 10 and the second substrate 20; then, the third alignment voltage U3 is constantly maintained for a fourth preset time t4, so that the alignment electric field formed between the first substrate 10 and the second substrate 20, in which the liquid crystal in the liquid crystal layer 30 is deflected again and is deflected from the first pretilt angle α 1 to the second pretilt angle α 2, is maintained for a fourth preset time t 4; since the third alignment voltage U3 is less than the second alignment voltage U2 and the magnitude of the pretilt angle is positively correlated with the corresponding alignment voltage, that is, the larger the corresponding alignment voltage is, the larger the pretilt angle of the liquid crystal in the liquid crystal layer 30 is, the second pretilt angle α 2 can be made smaller than the first pretilt angle α 1; the smaller second pretilt angle α 2 weakens the acting force between the liquid crystal molecules in the liquid crystal layer 30, so that in the subsequent process of bending the display panel 100, the smaller second pretilt angle α 2 of the liquid crystal in the liquid crystal layer 30 has a space for deflection under the stress action of the substrate, and the smaller molecular acting force between the liquid crystals makes the arrangement change of the liquid crystal molecules smaller, thereby avoiding the problem that dark clusters appear in the bending region of the display panel 100 due to the reduction of the light transmittance of the liquid crystal layer 30.
Specifically, the range of the second alignment voltage U2 is 14 to 18V, the range of the third preset time t3 may be 5 to 10s, the range of the third alignment voltage U3 is 10 to 12V, and the range of the fourth preset time t4 may be 3 to 10s, and the second alignment voltage U2, the third preset time t3, the third alignment voltage U3, and the fourth preset time t4 may be set within the range according to actual requirements, which is not particularly limited; for example, in one embodiment, it is preferable that the second alignment voltage U2 is 16V, the third predetermined time t3 is 6s, the third alignment voltage U3 is 11V, and the fourth predetermined time t4 is 5 s; that is, the second alignment voltage U2 is decreased from 16V to 11V at a time of 6s, and then constantly maintained for 5 s.
In one embodiment, in the step of decreasing the second alignment voltage U2 to the third alignment voltage U3 at the third predetermined time t3, the second alignment voltage U2 is decreased to the third alignment voltage U3 in a multi-step manner. Similar to the multi-step increase of the first alignment voltage U1 to the second alignment voltage U2, the multi-step decrease can keep the second alignment voltage U2 constant for a short time in each step, so that the liquid crystal in the liquid crystal layer 30 has a sufficient response time to facilitate the deflection of the liquid crystal. The number of steps, the holding time of each step and the descending amount of the voltage descending from one step to the next step can be set according to actual requirements; specifically, the holding time of each step may be the same or different, and the amount of voltage drop from one step to the next step may be the same or different; that is, in the process of reducing the second alignment voltage U2 to the third alignment voltage U3 in a multi-step manner, the second alignment voltage U2 may be reduced in a uniform amount in a multi-step manner, or may be reduced in a non-uniform manner in a multi-step manner, which is not limited in this application.
In this embodiment, the second alignment voltage U2 is 16V, the third predetermined time t3 is 6s, and the third alignment voltage U3 is 11V; the second alignment voltage U2 is stepped down from 16V to 11V in three steps at a time of 6 s; the holding time of each step is 2s, the second alignment voltage U2 of 16V is first decreased to 14V and held for 2s, i.e. decreased to the first step, then the voltage is decreased from 14V to 12V and held for 2s, i.e. decreased to the second step, and then the voltage is decreased from 12V to 11V and held for 2s, i.e. decreased to the third step, so as to complete the step, and an alignment electric field is formed between the first substrate 10 and the second substrate 20, so that the liquid crystal in the liquid crystal layer 30 is deflected.
S23: the display panel 100 is photo-aligned such that the second pretilt angle α 2 of the liquid crystal in the liquid crystal layer 30 near the first substrate 10 and near the second substrate 20 is fixed.
In this embodiment, the ultraviolet light is irradiated to the display panel 100, so that the liquid crystal angle deflected to the second pretilt angle α 2 in the liquid crystal layer 30 is fixed, the arrangement of the liquid crystals in the liquid crystal layer 30 is orderly and fixed, and the light beam can penetrate through the liquid crystal layer 30, so that the display panel 100 displays an image.
Specifically, performing photo-alignment on the display panel 100 to fix the second pretilt angle α 2 of the liquid crystal close to the first substrate 10 and the second substrate 20 in the liquid crystal layer 30 specifically includes the following steps:
s231: in the step of setting the pretilt angle of the liquid crystals in the liquid crystal layer 30, the first ultraviolet irradiation is simultaneously performed such that the second pretilt angle α 2 of the liquid crystals in the liquid crystal layer 30 near the first substrate 10 and near the second substrate 20 is fixed.
Referring to FIG. 5d, FIG. 5d is a schematic diagram illustrating the state of liquid crystals in the liquid crystal layer 30 after photo-alignment of the display panel 100; in this embodiment, the first uv irradiation is performed to align the liquid crystal in the liquid crystal layer 30, such that the liquid crystal in the liquid crystal layer 30 near the first substrate 10 and near the second substrate 20 is deflected to the second pretilt angle α 2 and fixed, and the liquid crystal in the liquid crystal layer 30 at the middle layer is deflected back to the initial state; meanwhile, the sealant between the first substrate 10 and the second substrate 20 is cured, so that the connection between the first substrate 10 and the second substrate 20 is more reliable.
Specifically, after step S231, the method further includes:
s232: performing a second ultraviolet irradiation on the display panel 100; wherein, the time or the intensity of the second ultraviolet irradiation is larger than that of the first ultraviolet irradiation.
In this embodiment, the display panel 100 is irradiated with ultraviolet light for the second time, so that the reaction of the Reactive Monomer (RM) remaining in the display panel 100 is completed. Wherein, the time or intensity of the second ultraviolet irradiation is longer than that of the first ultraviolet irradiation; it is understood that a substantial portion of the RMs remains in the liquid crystal composition after the first uv exposure, and the second uv exposure requires complete removal of these residual RMs, requiring more uv source power.
S30: the display panel 100 is bent.
In this embodiment, the display panel 100 obtained in the above embodiment is bent to form a curved plate to obtain a desired curved liquid crystal panel.
Referring to fig. 6, fig. 6 is a schematic structural view of a display panel 100 according to an embodiment of the present disclosure before and after bending; in this embodiment, step S30 includes: the display panel 100 is integrally bent to form a curved plate.
Further, in this embodiment, before step S20, the method further includes the steps of: the display panel 100 is divided into a plurality of bending regions 101/102/103 according to the degree of bending of the curved plate.
Specifically, the entire display panel 100 is bent to form a curved plate, and the bending degrees of different regions of the curved plate are different, as shown in fig. 6, when the bending degrees of the plurality of curved surface portions 101a/102a/103a corresponding to the curved plate are different corresponding to the plurality of bending regions 101/102/103 of the display panel 100 before bending, the stress action of the first substrate 10 and the second substrate 20 on the liquid crystal in the corresponding portion of the liquid crystal layer 30 is different, and the influence of the stress action on the liquid crystal mainly means the influence of the magnitude and direction of the stress on the liquid crystal in the liquid crystal deflection direction of the corresponding portion of the liquid crystal layer 30; generally, the larger the degree of bending, i.e., the larger the curvature, the larger the stress action of the first substrate 10 and the second substrate 20 on the liquid crystal of the corresponding portion in the liquid crystal layer 30, the larger the angle at which the liquid crystal in the corresponding liquid crystal layer 30 is deflected, so that the corresponding light transmittance is reduced, and the more easily the display panel 100 appears dark clusters. Therefore, before the step of setting the pretilt angle of the liquid crystal in the liquid crystal layer 30, the display panel 100 may be further divided into a plurality of bending regions 101/102/103 according to the bending degree of the curved plate, and certainly, the display panel may be divided into more bending regions, which is not limited in this application. Then, in the step S20 of setting the pretilt angle of the liquid crystal in the liquid crystal layer 30, specifically, the method may include:
s21: in the plurality of bending regions, a first alignment voltage U1 is applied between the first substrate 10 and the second substrate 20, the first alignment voltage U1 is increased to a second alignment voltage U2 for a first preset time t1, and the second alignment voltage U2 is kept constant for a second preset time t2, so that the liquid crystal in the liquid crystal layer 30 is deflected to a first pretilt angle α 1.
S22: in the plurality of bending regions 101/102/103, the second alignment voltage U2 is decreased to the third alignment voltage U3 for a third preset time t3, and the third alignment voltage U3 is constantly maintained for a fourth preset time t4, so that the liquid crystal in the liquid crystal layer 30 is deflected to the second pretilt angle α 2; the magnitude of the third alignment voltage U3 is negatively related to the degree of curvature of the bending region corresponding to the third alignment voltage U3, and the magnitude of the second pretilt angle α 2 is positively related to the third alignment voltage U3 of the bending region corresponding to the second pretilt angle α 2.
Specifically, the function and action of step S21 in this embodiment are the same as or similar to those of step S21 in the above embodiments, and specific reference may be made to the above, and details are not repeated here. The first alignment voltage U1, the first preset time t1, the second alignment voltage U2, and the second preset time t2 are the same as those in the above embodiments, and may be set according to actual requirements.
Specifically, for the plurality of different bending regions 101/102/103, the second alignment voltage U2 is decreased to the third alignment voltage U3 at a third preset time t3, so as to form different alignment electric fields between the first substrate 10 and the second substrate 20 corresponding to the different bending regions 101/102/103, and then the bottom single voltage is kept constant for a fourth preset time t4, so that the corresponding bending regions 101/102/103 between the first substrate 10 and the second substrate 20 are corresponding to the different bending regions, and the formed corresponding alignment electric fields are kept for the fourth preset time t4, so that the liquid crystals in the liquid crystal layer 30 corresponding to the different bending regions 101/102/103 are deflected in the corresponding alignment electric fields to form corresponding second pretilt angles α 2. The magnitude of the third alignment voltage U3 corresponding to the different bending regions 101/102/103 is negatively correlated with the bending degree of the corresponding bending region 101/102/103, and the magnitude of the second pretilt angle α 2 is positively correlated with the third alignment voltage U3 of the corresponding bending region 101/102/103; that is, the larger the degree of bending of the bending region 101/102/103 is, the smaller the corresponding third alignment voltage U3 is, and the smaller the corresponding second pretilt angle α 2 is. It will also be appreciated that, for the various fold regions 101/102/103, the greater the degree of bending of the bent region 101/102/103, the greater the stress applied to the liquid crystal in the liquid crystal layer 30 in that region by the first and second substrates 10 and 20, and to reduce the influence of the stress on the liquid crystal, when the liquid crystal in the liquid crystal layer 30 in this region is photoaligned, the second pretilt angle α 2 corresponding to the liquid crystal in the liquid crystal layer 30 is made smaller, the smaller the third alignment voltage U3 corresponding to the bending region 101/102/103 should be set, so that after the display panel 100 is bent, the liquid crystals in different regions of the liquid crystal layer 30 overcome different stresses and deflect to form a final pre-tilt angle, so that the molecules of the whole liquid crystals in the liquid crystal layer 30 are orderly arranged and have good light transmittance, thereby avoiding the problem of dark clusters at the inflection region 101/102/103.
The setting ranges of the third alignment voltage U3 and the fourth preset time t4 are the same as the setting ranges of the third alignment voltage U3 and the fourth preset time t4 according to the above embodiments, and may be specifically set according to actual requirements, such as the bending degree of the bending region 101/102/103, the angle of the second pretilt angle α 2, and the like, which is not specifically limited.
Referring to fig. 7, fig. 7 is a schematic structural view of a display panel 100 according to another embodiment of the present application before and after bending; in this embodiment, step S30 specifically includes: the display panel 100 is partially bent to form a curved surface portion 105a, and is held as a flat surface portion 104a without being bent.
Similar to the previous embodiment, in this embodiment, the curved surface portion of the display panel 100 is formed by bending, and the liquid crystal in the liquid crystal layer 30 corresponding to this region needs to be deflected again against the stress of the first substrate 10 and the second substrate 20; the flat portions 104a are not bent without overcoming the stress of the first and second substrates 10 and 20, and thus the liquid crystal in the corresponding liquid crystal layer 30 is not deflected after the photo-alignment is completed.
Further, before the step S20 of setting the pretilt angle of the liquid crystal in the liquid crystal layer 30, the method further includes: the display panel 100 is divided into a bending region 105 and a non-bending region 104 according to the curved surface portion 105a and the flat surface portion 104 a.
In accordance with this embodiment, the step S20 of setting the pretilt angle of the liquid crystal in the liquid crystal layer 30 may specifically include:
s21: in the bending region 105 and the non-bending region 104, a first alignment voltage U1 is applied between the first substrate 10 and the second substrate 20, the first alignment voltage U1 is increased to a second alignment voltage U2 for a first preset time t1, and the second alignment voltage U2 is kept constant for a second preset time t2, so that the liquid crystal in the liquid crystal layer 30 is deflected to the first pretilt angle α 1.
S22: in the bending region 105, the second alignment voltage U2 is decreased to the third alignment voltage U3 for the third preset time t3, and the third voltage is constantly maintained for the fourth preset time t4, so that the liquid crystal in the liquid crystal layer 30 reaches the second pretilt angle α 2; wherein the second pretilt α 2 is smaller than the first pretilt α 1.
In step S22, the second alignment voltage U2 is continuously applied between the first substrate 10 and the second substrate 20 in the non-bending region 104, and the pretilt angle of the liquid crystal in the liquid crystal layer 30 corresponding to the non-bending region 104 is kept to be the first pretilt angle α 1.
In this embodiment, the setting ranges of the first alignment voltage U1, the first preset time t1, the second alignment voltage U2, the second preset time t2, the third alignment voltage U3, the third preset time t3, and the fourth preset time t4 are the same as those of the above embodiments, and the functions and functions thereof are also the same or similar, and are not repeated herein. In the display panel 100 obtained by this embodiment, the pretilt angle of the liquid crystal in the liquid crystal layer 30 corresponding to the bent region 105 is the second pretilt angle α 2, the pretilt angle of the liquid crystal in the liquid crystal layer 30 corresponding to the non-bent region 104 is the first pretilt angle α 1, and the second pretilt angle α 2 is smaller than the first pretilt angle α 1, so that after stress action of the first substrate 10 and the second substrate 20 during bending is overcome, the molecular arrangement of the liquid crystal in the liquid crystal layer 30 corresponding to the bent region 105 and the non-bent region 104 is consistent, the light transmittance is good, and the problem that a dark cluster appears in the curved surface portion 105a of the display panel 100 after bending is avoided.
Further, the step S23 of performing photo alignment on the display panel 100 to fix the second pretilt angle α 2 of the liquid crystal in the liquid crystal layer 30 near the first substrate 10 and near the second substrate 20 may specifically include: the first pretilt angle α 1 of the liquid crystal near the first substrate 10 and the second substrate 20 in the liquid crystal layer 30 of the non-bent region 104 is fixed, and the second pretilt angle α 2 of the liquid crystal near the first substrate 10 and the second substrate 20 in the liquid crystal layer 30 of the bent region 105 is fixed.
In this embodiment, the pretilt angle corresponding to the liquid crystal in the liquid crystal layer 30 is fixed, specifically, the liquid crystal in the liquid crystal layer 30 in the non-bending region 104 is fixed to the first pretilt angle α 1, and the liquid crystal in the liquid crystal layer 30 in the bending region 105 is fixed to the second pretilt angle α 2, so that after the display panel 100 is bent, the final deflection angles of the molecules of the liquid crystal in each region in the liquid crystal layer 30 in the display panel 100 with a curved surface obtained are kept consistent, the molecules of the liquid crystal are arranged in order, the light transmittance is good, and the problem that the curved surface portion 105a has a dark cluster is avoided.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a display panel 100 according to an embodiment of the present disclosure; in this embodiment, a display panel 100 is provided, and the display panel 100 is manufactured by the method for manufacturing a liquid crystal panel according to the above embodiment. The display panel 100 is at least partially bent to form a bent portion 106, and the display panel 100 includes a first substrate 10, a second substrate 20 and a liquid crystal layer 30; the first substrate 10 is located on a side of the liquid crystal layer 30 facing away from the second substrate 20. Specifically, the deflection angle of the liquid crystal in the liquid crystal layer 30 corresponding to the bending portion 106 of the display panel 100 is consistent with the deflection angle of the liquid crystal in the whole liquid crystal layer 30, so that the transmittance of the bending portion 106 is greater than 20%, and the occurrence of dark lumps at the bending portion 106 can be avoided. In a specific embodiment, the light transmittance of the bent portion 106 of the display panel 100 may also be greater than 40% or greater than 60%, or greater than 80%, and may be specifically set according to different application scenarios or requirements of different models; the transmittance of the bent portion 106 of the display panel 100 can be specifically set by setting the pre-tilt angle of the liquid crystal in the liquid crystal layer 30 in the above-mentioned method for manufacturing the liquid crystal panel, so that the transmittance of the bent portion 106 of the display panel 100 reaches a preset target value.
In the display panel 100 provided by the embodiment, the light transmittance of the liquid crystal layer 30 of the bent portion 106 is greater than 20%, so that the light transmittance of the bent portion 106 of the display panel 100 is relatively good, and the problem that dark lumps are easily generated in the bent portion 106 of the display panel 100 is avoided.
The above are only embodiments of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent processes performed by the present application and the contents of the attached drawings, which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A method for manufacturing a liquid crystal panel, comprising:
providing a display panel, wherein the display panel comprises a first substrate, a second substrate and a liquid crystal layer, and the first substrate is positioned on one side of the liquid crystal layer, which is far away from the second substrate;
setting a pretilt angle of liquid crystals in the liquid crystal layer;
bending the display panel;
wherein the step of setting a pretilt angle of liquid crystal in the liquid crystal layer includes:
applying a first alignment voltage between the first substrate and the second substrate, increasing the first alignment voltage to a second alignment voltage within a first preset time, and keeping the second alignment voltage constant for a second preset time, so that liquid crystals in the liquid crystal layer deflect to a first pretilt angle;
reducing the second alignment voltage to a third alignment voltage in a third preset time, and keeping the third alignment voltage constant for a fourth preset time so that the liquid crystal in the liquid crystal layer deflects to a second pretilt angle; wherein the second pretilt is less than the first pretilt;
and carrying out optical alignment on the display panel, so that a second pretilt angle of liquid crystal close to the first substrate and the second substrate in the liquid crystal layer is fixed.
2. The method according to claim 1, wherein the first alignment voltage is in a range of 0 to 12V, the second alignment voltage is in a range of 14 to 18V, and the third alignment voltage is in a range of 10 to 12V.
3. The method of claim 1, wherein the first predetermined time is 40-70s, the second predetermined time is 5-20s, the third predetermined time is 5-10s, and the fourth predetermined time is 3-10 s.
4. The method according to claim 1, wherein in the step of increasing the first alignment voltage to the second alignment voltage for the first predetermined time, the first alignment voltage is increased to the second alignment voltage in a multi-step manner;
in the step of reducing the second alignment voltage to a third alignment voltage for a third predetermined time, the second alignment voltage is reduced to the third alignment voltage in a multi-step manner.
5. The method according to claim 1, wherein the step of bending the display panel comprises: bending the whole display panel to form a curved plate;
the step of setting the pretilt angle of the liquid crystal in the liquid crystal layer further comprises the following steps: dividing the display panel into a plurality of bending areas according to the bending degree of the curved panel;
the step of setting a pretilt angle of liquid crystals in the liquid crystal layer includes:
in the plurality of bending regions, applying the first alignment voltage between the first substrate and the second substrate, increasing the first alignment voltage to the second alignment voltage within the first preset time, and keeping the second alignment voltage constant for the second preset time, so that liquid crystals in the liquid crystal layer deflect to the first pre-tilt angle;
in the plurality of bending regions, reducing the second alignment voltage to the third alignment voltage within the third preset time, and keeping the third voltage constant for the fourth preset time, so that the liquid crystal in the liquid crystal layer deflects to the second pretilt angle; wherein the magnitude of the third alignment voltage is inversely related to the bending degree of the bending region corresponding to the third alignment voltage, and the magnitude of the second pretilt angle is positively related to the third alignment voltage of the bending region corresponding to the second pretilt angle.
6. The method according to claim 1, wherein the step of bending the display panel comprises: bending the display panel part to form a curved surface part and keeping the non-bent part as a flat part;
the step of setting the pretilt angle of the liquid crystal in the liquid crystal layer further comprises the following steps of: dividing the display panel into a bending area and a non-bending area according to the curved surface part and the plane part;
the step of setting a pretilt angle of liquid crystals in the liquid crystal layer includes:
applying the first alignment voltage between the first substrate and the second substrate in the bending region and the non-bending region, increasing the first alignment voltage to the second alignment voltage in the first preset time, and keeping the second alignment voltage constant for the second preset time, so that liquid crystals in the liquid crystal layer deflect to the first pretilt angle;
in the bending area, reducing the second alignment voltage to a third alignment voltage within the third preset time, and keeping the third voltage constant for a fourth preset time, so that liquid crystals in the liquid crystal layer are deflected to the second pre-tilt angle; wherein the second pretilt is less than the first pretilt;
and carrying out optical alignment on the display panel, so that a first pretilt angle of liquid crystal close to the first substrate and the second substrate in the liquid crystal layer of the non-bending region is fixed, and a second pretilt angle of liquid crystal close to the first substrate and the second substrate in the liquid crystal layer of the bending region is fixed.
7. The method according to claim 1, wherein the step of photoaligning the display panel so that a second pretilt angle of the liquid crystal close to the first substrate and the second substrate in the liquid crystal layer is fixed specifically comprises:
in the step of applying alignment voltage between the first substrate and the second substrate, performing first ultraviolet irradiation simultaneously so that a second pretilt angle of liquid crystal close to the first substrate and the second substrate in the liquid crystal layer is fixed.
8. The method according to claim 7, wherein the step of photoaligning the display panel such that a second pretilt angle of liquid crystal in the liquid crystal layer near the first substrate and near the second substrate is fixed further comprises:
carrying out secondary ultraviolet illumination on the display panel; and the time or the intensity of the second ultraviolet irradiation is greater than that of the first ultraviolet irradiation.
9. A display panel, at least partially bent to form a bent portion, comprising: the liquid crystal display panel comprises a first substrate, a second substrate and a liquid crystal layer, wherein the first substrate is positioned on one side of the liquid crystal layer, which is far away from the second substrate; the liquid crystal display panel is characterized in that the light transmittance of the liquid crystal layer at the bent part is more than 20%.
10. A display panel produced by the method for producing a liquid crystal panel according to any one of claims 1 to 9.
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