CN114740661B - 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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- CN114740661B CN114740661B CN202210377255.4A CN202210377255A CN114740661B CN 114740661 B CN114740661 B CN 114740661B CN 202210377255 A CN202210377255 A CN 202210377255A CN 114740661 B CN114740661 B CN 114740661B
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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
Abstract
The application provides a preparation method of a liquid crystal panel and the 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 at one side of the liquid crystal layer, which is away from the second substrate; setting a pretilt angle of liquid crystal in the liquid crystal layer; performing optical alignment on the display panel to fix a second pretilt angle of liquid crystal close to the first substrate and close to the second substrate in the liquid crystal layer; 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 phenomenon of dark lines of the display panel; but also avoids the problem that dark clusters appear at the bending part of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a preparation method of a liquid crystal display panel and the display panel.
Background
With the continuous development of liquid crystal display technology, thin film transistor liquid crystal displays (Thin Film Transistor-Liquid Crystal Display, TFT-LCD) are becoming the main stream of display panels, especially curved liquid crystal displays, which are popular with people due to their good viewing angle and large size.
Currently, a TFT-LCD mainly includes an array substrate, a color film substrate, and a Liquid Crystal (LC) layer disposed between the array substrate and the color film substrate. One of the commonly used liquid crystal display modes for TFT-LCDs is the vertical alignment mode (Vertically Alignment, VA), which is currently widely used in liquid crystal display products due to its high contrast, fast response time characteristics.
However, when the display panel is optically aligned, not only is the problem that dark lines appear on the display panel due to poor convergence of liquid crystal easily occurred, but also the problem that dark groups appear due to the change of pretilt angles of liquid crystal molecules caused by the stress effect of the substrate at the bending part on the liquid crystal molecules in the process of bending the display panel after the optical alignment of the display panel is completed, so that the light transmittance at the bending part is reduced.
Disclosure of Invention
The preparation method of the liquid crystal panel and the display panel provided by the application aim at solving the problems that dark lines appear on the display panel due to poor convergence of liquid crystal when the display panel is subjected to optical alignment, and dark groups appear due to the fact that the pretilt angle of liquid crystal molecules changes due to the stress effect of the substrate at the bending part of the display panel, so that the light transmittance of the part is reduced.
In order to solve the problems, the application adopts a technical scheme 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:
the 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 away from the second substrate.
Setting a pretilt angle of liquid crystal in the liquid crystal layer; wherein the step of setting 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, raising the first alignment voltage to a second alignment voltage in 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 are deflected to a first pretilt angle;
reducing the second alignment voltage to a ground three-alignment voltage in a third preset time, and keeping the third alignment voltage constant for a fourth preset time so that liquid crystals in the liquid crystal layer deflect 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.
And bending the display panel.
The first alignment voltage ranges from 0V to 12V, the second alignment voltage ranges from 14V to 18V, and the third alignment voltage ranges from 10V to 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 3-10s.
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-stage step mode.
In the step of reducing the second alignment voltage to the third alignment voltage in the third preset time, the second alignment voltage is reduced to the third alignment voltage in a multistage step mode.
Wherein the step of bending the display panel includes: and integrally bending the display panel to form a curved panel.
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 plate.
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 bending areas, raising 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 is deflected to the first pretilt angle.
In the bending areas, the second alignment voltage is reduced to the third alignment voltage in the third preset time, the third voltage is kept constant for the fourth preset time, and the liquid crystal in the liquid crystal layer is deflected to the second pretilt angle; 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 step of bending the display panel includes: the display panel portion is bent to form a curved portion, and the unbent portion is kept as a flat portion.
The step of setting the pretilt angle of the liquid crystal in the liquid crystal layer further comprises: the display panel is divided into a bending region and a non-bending region according to the curved surface portion and the planar portion.
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 bending region and the non-bending region, raising 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 region, reducing the second alignment voltage to the third alignment voltage in 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 reaches the second pretilt angle; wherein the second pretilt is less than the first pretilt.
The step of performing photoalignment on the display panel, so that a second pretilt angle of the liquid crystal in the liquid crystal layer, which is close to the first substrate and the second substrate, is fixed specifically includes:
a first pretilt angle of liquid crystal in the liquid crystal layer of the non-bending region near the first substrate and near the second substrate is fixed, and a second pretilt angle of liquid crystal in the liquid crystal layer of the bending region near the first substrate and near the second substrate is fixed.
The step of performing photoalignment on the display panel, so that a second pretilt angle of the liquid crystal in the liquid crystal layer, which is close to the first substrate and the second substrate, is fixed specifically includes:
in the step of applying an alignment voltage between the first substrate and the second substrate, a first ultraviolet irradiation is performed simultaneously, so that a second pretilt angle of liquid crystal in the liquid crystal layer, which is close to the first substrate and the second substrate, is fixed.
The step of optically aligning the display panel so that the second pretilt angle of the liquid crystal in the liquid crystal layer near the first substrate and near the second substrate is fixed further comprises:
performing second ultraviolet irradiation on the display panel; wherein the time or intensity of the second ultraviolet irradiation is greater than the time or intensity of the first ultraviolet irradiation.
In order to solve the technical problems, a second technical scheme adopted by the application is as follows: a display panel is provided. The display panel is at least partially bent to form a bending part, and comprises: the liquid crystal display 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 away from the second substrate; wherein, the light transmittance of the liquid crystal layer of the bending part is more than 20 percent.
In order to solve the technical problem, a third technical scheme adopted in the application is as follows: a display panel is provided. The display panel is manufactured by the manufacturing method of the liquid crystal panel.
According to the preparation method of the liquid crystal panel and the display panel, the first alignment voltage is applied between the first substrate and the second substrate, the first alignment voltage is increased to the second alignment voltage in the first preset time, so that a convergence electric field is formed between the first substrate and the second substrate, the second alignment voltage is kept constant for the second preset time, so that the convergence electric field formed between the first substrate and the second substrate is kept for the second preset time, and in the electric field, liquid crystal in the liquid crystal layer deflects 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 converged electric field, so that the problem that dark lines appear on the display panel due to the fact that the light transmittance of part of liquid crystal in the liquid crystal layer is reduced due to poor convergence is avoided. And the second alignment voltage is reduced to the third alignment voltage in a third preset time so as to form an alignment electric field between the first substrate and the second substrate, and the third alignment voltage is kept constant for a fourth preset time so that the alignment electric field formed between the first substrate and the second substrate is kept for the fourth preset time, the liquid crystal in the liquid crystal layer deflects to a second pretilt angle in the electric field, and the second pretilt angle is smaller than the first pretilt angle, thereby reducing molecular acting force between the liquid crystals, and not only ensuring that the smaller second pretilt angle of the liquid crystal in the liquid crystal layer has a deflection space for overcoming the stress effect of the substrates in the process of bending the display panel, but also ensuring that the arrangement change of liquid crystal molecules is smaller due to the smaller molecular acting force between the liquid crystal, so that the problem of dark clusters in the bending area of the display panel caused by the reduction of the light transmittance of the liquid crystal layer is avoided.
Drawings
For a clearer description of the technical solutions in the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art, in which:
FIG. 1 is a schematic flow chart of an embodiment of a method for manufacturing a liquid crystal panel according to the present application;
FIG. 2 is a schematic diagram of the display panel formed in step S10 in FIG. 1;
FIG. 3 is a flow chart illustrating an embodiment of the step S20 in FIG. 1;
FIG. 4 is a waveform diagram of the alignment voltage applied in the first embodiment of step S20 in FIG. 1;
FIG. 5a is a schematic diagram showing a state of the liquid crystal in the liquid crystal layer in the first predetermined time period in FIG. 4;
FIG. 5b is a schematic diagram showing a state of the liquid crystal in the liquid crystal layer in the second predetermined time period in FIG. 4;
FIG. 5c is a schematic diagram showing the state of the liquid crystal in the liquid crystal layer within the third preset time and the fourth preset time in FIG. 4;
FIG. 5d is a schematic diagram showing a state of the liquid crystal in the rear liquid crystal layer after light alignment of the display panel;
FIG. 6 is a schematic 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 disclosure before and after bending;
fig. 8 is a schematic structural diagram of a display panel according to an embodiment of the present application.
Reference numerals:
100-a display panel; 10-a first substrate; 20-a second substrate; 30-a liquid crystal layer; u1-a first alignment voltage; u2-a second preset voltage; u3-a third preset voltage; t 1-a first preset time; t 2-a second preset time; t 3-a third preset time; t 4-a fourth preset time; α1-first pretilt; α2-second pretilt; 101/102/103-bending region; 101a/102a/103 a-curved portions; 104-non-bending region; 105-bending region; 104 a-a planar portion; 105 a-curved portions; 106-bend.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The terms "first," "second," "third," and the like in this application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", and "a third" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. All directional indications (such as up, down, left, right, front, back … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement, etc. between the components in a particular gesture (as shown in the drawings), and if the particular gesture changes, the directional indication changes accordingly. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may 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 may be included in at least one embodiment of the present application. The appearances of such phrases 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. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The present application is described in detail below with reference to the accompanying 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 according to the present application, and fig. 2 is a schematic structural diagram 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 comprising a first substrate 10, a second substrate 20 and a liquid crystal layer 30, the first substrate 10 being located on a side of the liquid crystal layer 30 facing away from the second substrate 20.
In this embodiment, the display panel 100 is provided as a display panel 100 after the alignment process, and after the alignment process is completed, the first substrate 10 and the second substrate 20 after the alignment process are cut to form the display panel 100, and the pins on the first substrate 10 and the second substrate 20 are exposed, so that the alignment of the liquid crystal layer 30 is performed subsequently. Specifically, the first substrate 10 may be a Thin Film Transistor (TFT) array substrate, the second substrate 20 may be a color film substrate, or the first substrate 10 may be a color film substrate, and the second substrate 20 may be a thin film transistor 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 pretilt angle of the liquid crystal in the liquid crystal layer 30, the liquid crystal molecules in the liquid crystal layer 30 are changed from an originally disordered aligned state to an ordered aligned state having a predetermined deflection angle, so that the light beam can penetrate the liquid crystal layer 30, and the display panel 100 displays an image.
Referring to fig. 3, fig. 3 is a flow chart illustrating an embodiment of the step S20; in this embodiment, setting the pretilt angle of the liquid crystal in the liquid crystal layer 30 specifically includes the steps of:
s21: a first alignment voltage U1 is applied between the first substrate 10 and the second substrate 20, and the first alignment voltage U1 is raised to a second alignment voltage U2 for a first preset time t1, and the second alignment voltage U2 is constantly maintained for a second preset time t2, so that the liquid crystal in the liquid crystal layer 30 is deflected to a first pretilt angle α1.
Referring to fig. 4 to 5b, fig. 4 is a waveform diagram of the alignment voltage applied in the embodiment of step S20 in fig. 1, fig. 5a is a schematic diagram of the state of the liquid crystal in the liquid crystal layer 30 in the first preset time t1 in fig. 4, and fig. 5b is a schematic diagram of the state of the liquid crystal in the liquid crystal layer 30 in the second preset 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, specifically, 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 preset time t1 to form a convergent electric field between the first substrate 10 and the second substrate 20; then, the second alignment voltage U2 is kept constant for a second preset time t2, so that a convergent electric field formed between the first substrate 10 and the second substrate 20 is kept for the second preset time t2, and in the electric field, the liquid crystal in the liquid crystal layer 30 is deflected to a first pretilt angle α1 in the electric field; meanwhile, within the second preset time t2, the liquid crystal in the liquid crystal layer 30 can be fully converged in the converged electric field, so as to avoid the problem that the light transmittance of a part of the liquid crystal in the liquid crystal layer 30 is reduced due to poor convergence, so that the display panel 100 has dark lines.
Specifically, the first alignment voltage U1 ranges from 0V to 12V, the first preset time t1 may range from 40 s to 70s, the second alignment voltage U2 ranges from 14V to 18V, and the second preset time t2 may range from 5s to 20s. In a specific embodiment, the first alignment voltage U1, the first preset time t1, the second alignment voltage U2, and the second preset time t2 may be selected within the above range according to actual requirements, which is not specifically limited in this application. For example, in one embodiment, it is preferable that the first alignment voltage U1 is 2V, the first preset time t1 is 60s, the second alignment voltage U2 is 16V, and the second preset time t2 is 10s; that is, the first alignment voltage U1 of 2V is applied between the first substrate 10 and the second substrate 20 through the exposed pins of the first substrate 10 and the second substrate 20, and then the first alignment voltage U1 is raised to 16V for 60s, and then is constantly maintained for 10s.
In a specific embodiment, in the step of raising the first alignment voltage U1 to the second alignment voltage U2 at the first preset time t1, the first alignment voltage U1 is raised to the second alignment voltage U2 in multiple steps; the multi-stage step-up mode enables the first alignment voltage U1 to be kept constant temporarily when being arranged on each stage of steps, so that the liquid crystal in the liquid crystal layer 30 has sufficient response time, and the liquid crystal is deflected easily. The number of steps, the holding time of each step and the voltage rise 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 increase in voltage from one step to the next may be the same or different; that is, the first alignment voltage U1 may be increased in a stepwise manner to the second alignment voltage U2, or may be increased unevenly in a stepwise manner, and the present application is not limited thereto.
In this embodiment, the initial value of the first alignment voltage U1 is 2V, the first preset time t1 is 60s, and the second alignment voltage U2 is 16V; then the first alignment voltage U1 is stepped up from 2V to 16V in six steps at 60 s; the holding time of each step is 10s, and the voltage is raised by 2.8V when the first alignment voltage U1 is raised to the next step, so that the first alignment voltage U1 is raised to 16V, and a convergence electric field is formed between the first substrate 10 and the second substrate 20, so that the liquid crystal can be fully converged while being deflected.
S22: reducing the second alignment voltage U2 to the third alignment voltage U3 at a third preset time t3, and keeping the third alignment voltage U3 constant for a fourth preset time t4 so that the liquid crystal in the liquid crystal layer 30 is deflected to a second pretilt angle α2; wherein the second pretilt angle α2 is smaller than the first pretilt angle α1.
Referring to fig. 4 and 5c, fig. 5c is a schematic diagram showing the state of the liquid crystal in the liquid crystal layer 30 in the third preset time t3 and the fourth preset time t4 in fig. 4; in the present embodiment, the second alignment voltage U2 is reduced to the third alignment voltage U3 at the third preset time t3 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 an alignment electric field formed between the first substrate 10 and the second substrate 20 is maintained for the fourth preset time t4, in which the liquid crystal in the liquid crystal layer 30 is deflected again and from the first pretilt angle α1 to the second pretilt angle α2; since the third alignment voltage U3 is smaller 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, so that the second pretilt angle α2 is smaller than the first pretilt angle α1; the smaller second pretilt angle α2 weakens the acting force between the liquid crystal molecules in the liquid crystal layer 30, so that in the subsequent bending process of the display panel 100, not only is the smaller second pretilt angle α2 of the liquid crystal in the liquid crystal layer 30 provided with a space for deflection for the stress action of the substrate, but also the smaller molecular acting force between the liquid crystal makes the arrangement change of the liquid crystal molecules smaller, thereby avoiding the problem that dark clusters appear in the bending area 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 14-18V, the third preset time t3 may be 5-10s, the range of the third alignment voltage U3 is 10-12V, the fourth preset time t4 may be 3-10s, 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 in 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 preset time t3 is 6s, the third alignment voltage U3 is 11V, and the fourth preset time t4 is 5s; that is, the second alignment voltage U2 was reduced from 16V to 11V at a time of 6s, and then constantly maintained for 5s.
In one embodiment, in the step of reducing the second alignment voltage U2 to the third alignment voltage U3 at the third preset time t3, the second alignment voltage U2 is reduced to the third alignment voltage U3 in multiple steps. Similar to the multi-stage step-up of the first alignment voltage U1 to the second alignment voltage U2, the multi-stage step-down manner can make the second alignment voltage U2 be kept constant temporarily while being on each stage step, so that the liquid crystal in the liquid crystal layer 30 has sufficient response time, thereby being beneficial to the deflection of the liquid crystal. The number of steps, the holding time of each step and the voltage drop 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 multistage stepwise manner, the average amount of the second alignment voltage U2 may be reduced in a multistage stepwise manner, or the average amount of the second alignment voltage U may be reduced in a multistage stepwise manner unevenly.
In this embodiment, the second alignment voltage U2 is 16V, the third preset 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 the time of 6 s; wherein the holding time of each step is 2s, the second alignment voltage U2 of 16V is first reduced to 14V for 2s, i.e. reduced to the first step, then the voltage is reduced from 14V to 12V for 2s, i.e. reduced to the second step, and then the voltage is reduced from 12V to 11V for 2s, i.e. reduced to the third step, so as to complete the step, an alignment electric field is formed between the first substrate 10 and the second substrate 20, and 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 α2 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 display panel 100 is irradiated with ultraviolet light, so that the liquid crystal angle of the liquid crystal layer 30 deflected to the second pretilt angle α2 is fixed, the arrangement of the liquid crystals in the liquid crystal layer 30 is orderly and fixed, and the light beam is allowed to penetrate the liquid crystal layer 30, so that the display panel 100 displays an image.
Specifically, the photoalignment of the display panel 100, such that the second pretilt angle α2 of the liquid crystal in the liquid crystal layer 30 near the first substrate 10 and near the second substrate 20 is fixed, specifically includes the following steps:
s231: in the step of setting the pretilt angle of the liquid crystal in the liquid crystal layer 30, the first ultraviolet irradiation is simultaneously performed so that the second pretilt angle α2 of the liquid crystal 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 showing a state of the liquid crystal in the liquid crystal layer 30 after the display panel 100 is photo-aligned; in this embodiment, the first ultraviolet irradiation is performed to align the liquid crystal in the liquid crystal layer 30, so 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 α2 and fixed, and the liquid crystal in the intermediate layer in the liquid crystal layer 30 is deflected to return to the initial state; meanwhile, the frame glue between the first substrate 10 and the second substrate 20 is also solidified, 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 intensity of the second ultraviolet light is greater than the time or intensity of the first ultraviolet light.
In this embodiment, the display panel 100 is subjected to the second ultraviolet irradiation 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 greater than the time or intensity of the first ultraviolet irradiation; it will be appreciated that a significant portion of the RM remains in the liquid crystal composition after the first uv exposure, and that the second uv exposure requires complete removal of the remaining RM, requiring more uv light source energy.
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 panel to obtain a desired curved liquid crystal panel.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a display panel 100 according to an embodiment of the present application before and after bending; in this embodiment, step S30 includes: the display panel 100 is integrally bent to form a curved panel.
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, when the display panel 100 is bent integrally to form a curved panel, and the bending degrees of different regions of the curved panel are different, as shown in fig. 6, the bending degrees of the curved portions 101a/102a/103a corresponding to the curved panel are different corresponding to the bending regions 101/102/103 of the display panel 100 before bending, and the stress effect of the first substrate 10 and the second substrate 20 on the liquid crystal at the corresponding portion in the liquid crystal layer 30 is different, where the influence of the stress effect on the liquid crystal mainly refers to the influence of the magnitude and direction of the stress on the liquid crystal deflection direction at the corresponding portion in the liquid crystal layer 30; in general, the greater the degree of bending, i.e., the greater the curvature, the greater the stress of the first and second substrates 10 and 20 on the liquid crystal at the corresponding portions of the liquid crystal layer 30, the greater the angle at which the liquid crystal at the corresponding liquid crystal layer 30 is deflected, so that the corresponding light transmittance is reduced, and the display panel 100 is more likely to have 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 of course, may be divided into more bending regions, which is not particularly limited in this application. Then, in step S20 of setting a pretilt angle of the liquid crystal in the liquid crystal layer 30, specific steps 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, and the first alignment voltage U1 is raised 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 α1.
S22: in the plurality of bending areas 101/102/103, the second alignment voltage U2 is reduced to the third alignment voltage U3 in a third preset time t3, and the third alignment voltage U3 is kept constant for a fourth preset time t4, so that the liquid crystal in the liquid crystal layer 30 is deflected to a second pretilt angle alpha 2; the magnitude of the third alignment voltage U3 is inversely related to the bending degree of the bending region corresponding to the third alignment voltage U3, and the magnitude of the second pretilt angle α2 is positively related to the third alignment voltage U3 of the bending region corresponding to the second pretilt angle α2.
Specifically, the function and function of step S21 in this embodiment are the same as or similar to those of step S21 in the above embodiment, and reference is specifically 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 embodiment, and may be specifically set according to actual requirements.
Specifically, for the plurality of different bending regions 101/102/103, the second alignment voltage U2 is reduced to the third alignment voltage U3 at a third preset time t3, so as to form different alignment electric fields corresponding to the different bending regions 101/102/103 between the first substrate 10 and the second substrate 20, then the base sheet voltage is kept constant for a fourth preset time t4, so that the corresponding alignment electric fields formed between the first substrate 10 and the second substrate 20 corresponding to the different bending regions 101/102/103 are kept for the fourth preset time t4, and the liquid crystal in the liquid crystal layer 30 corresponding to the different bending regions 101/102/103 deflects in the corresponding alignment electric fields to form a corresponding second pretilt angle α2. Wherein, the magnitude of the third alignment voltage U3 corresponding to the different bending regions 101/102/103 is inversely related to the bending degree of the corresponding bending region 101/102/103, and the magnitude of the second pretilt angle α2 is positively related to the third alignment voltage U3 of the corresponding bending region 101/102/103; that is, the greater the degree of bending of the bending region 101/102/103, the smaller the corresponding third alignment voltage U3, and the smaller the corresponding second pretilt angle α2. It can be also understood that, for different bending regions 101/102/103, the greater the bending degree of the bending regions 101/102/103, the greater the stress effect of the first substrate 10 and the second substrate 20 on the liquid crystal in the liquid crystal layer 30 in the region, and in order to reduce the influence of the stress effect on the liquid crystal, when the liquid crystal in the liquid crystal layer 30 in the region is photo-aligned, the smaller the second pretilt angle α2 of the liquid crystal in the corresponding liquid crystal layer 30 should be made, the smaller the third alignment voltage U3 of the corresponding bending region 101/102/103 should be set, so that after the display panel 100 is bent, the liquid crystal in different regions in the liquid crystal layer 30 overcomes the final pretilt angle after the liquid crystal in different regions is deflected, so that the molecules of the whole liquid crystal in the liquid crystal layer 30 are orderly arranged, and the light transmittance is good, thereby avoiding the problem of generating dark clusters in the bending regions 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 embodiment, and specifically may be set according to the bending degree of the bending region 101/102/103, the angle of the second pretilt angle α2, and other practical requirements, which are not limited specifically.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a display panel 100 according to another embodiment of the present disclosure before and after bending; in this embodiment, step S30 specifically includes: the display panel 100 is partially bent to form a curved portion 105a, and the unbent portion is kept as a flat portion 104a.
Similar to the previous embodiment, in this embodiment, the curved surface portion of the display panel 100 is formed by bending, so that the liquid crystal in the liquid crystal layer 30 corresponding to the region needs to overcome the stress of the first substrate 10 and the second substrate 20 and deflect again; the planar portion 104a is not bent without overcoming the stress of the first and second substrates 10 and 20, and thus the liquid crystal in its 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, it 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 104a.
Corresponding to 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, and the first alignment voltage U1 is raised 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 α1.
S22: in the bending region 105, the second alignment voltage U2 is reduced to the third alignment voltage U3 at the third preset time t3, and the third voltage is kept constant for the fourth preset time t4, so that the liquid crystal in the liquid crystal layer 30 reaches the second pretilt angle α2; wherein the second pretilt angle α2 is smaller than the first pretilt angle α1.
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 maintained at the first pretilt angle α1.
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 in the above embodiment, and their functions are the same as or similar to those of the above embodiment, and are not repeated here. In the display panel 100 obtained in this embodiment, the pretilt angle of the liquid crystal in the liquid crystal layer 30 corresponding to the bending region 105 is the second pretilt angle α2, the pretilt angle of the liquid crystal in the liquid crystal layer 30 corresponding to the non-bending region 104 is the first pretilt angle α1, and the second pretilt angle α2 is smaller than the first pretilt angle α1, so as to overcome the stress effect of the first substrate 10 and the second substrate 20 during bending, and make the molecular arrangement of the liquid crystal in the liquid crystal layer 30 corresponding to the bending region 105 and the non-bending region 104 consistent, and the light transmittance is better, so that the problem of dark clusters in the curved surface portion 105a of the display panel 100 after bending is avoided.
Further, the step S23 of photoaligning the display panel 100 so that the second pretilt angle α2 of the liquid crystal in the liquid crystal layer 30 near the first substrate 10 and near the second substrate 20 is fixed may specifically include: the first pretilt angle α1 of the liquid crystal in the liquid crystal layer 30 near the first substrate 10 and near the second substrate 20 in the non-bending region 104 is fixed, and the second pretilt angle α2 of the liquid crystal in the liquid crystal layer 30 near the first substrate 10 and near the second substrate 20 in the bending 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 be the first pretilt angle α1, and the liquid crystal in the liquid crystal layer 30 in the bending region 105 is fixed to be the second pretilt angle α2, so that after the display panel 100 is bent, the final deflection angles of the molecules of the liquid crystal in each region of the liquid crystal layer 30 in the obtained curved display panel 100 are kept consistent, and the molecular arrangement of the liquid crystal is ordered, so that the light transmittance is good, and the problem that dark clusters occur in the curved surface portion 105a is avoided.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a display panel 100 according to an embodiment of the disclosure; in this example, a display panel 100 is provided, and the display panel 100 is manufactured by the manufacturing method of the liquid crystal panel according to the above embodiment. The display panel 100 is at least partially bent to form a bending 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 light transmittance of the bending portion 106 is greater than 20%, and the occurrence of the dark cluster problem of the bending portion 106 can be avoided. In a specific embodiment, the light transmittance of the bending portion 106 of the display panel 100 may be greater than 40% or greater than 60%, or greater than 80%, and may be specifically set according to different application scenarios or different types of requirements; the light transmittance of the bending portion 106 of the display panel 100 may be set to a preset target value by setting the pretilt angle of the liquid crystal in the liquid crystal layer 30 in the above-mentioned preparation method of the liquid crystal panel.
According to the display panel 100 provided by the embodiment, the light transmittance of the liquid crystal layer 30 of the bending part 106 is greater than 20%, so that the light transmittance of the bending part 106 of the display panel 100 is better, and the problem that the bending part 106 of the display panel 100 is easy to generate dark clusters is avoided.
The foregoing is only the embodiments of the present application, and not the patent scope of the present application is limited by the foregoing description, but all equivalent structures or equivalent processes using the contents of the present application and the accompanying drawings, or directly or indirectly applied to other related technical fields, which are included in the patent protection scope of the present application.
Claims (8)
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 at one side of the liquid crystal layer away from the second substrate;
setting a pretilt angle of liquid crystal in the liquid crystal layer;
bending the display panel;
wherein the step of bending the display panel includes: bending the display panel part to form a curved part and keeping the unbent part to be a plane part;
the step of setting the pretilt angle of the liquid crystal in the liquid crystal layer further comprises: dividing the display panel into a bending region and a non-bending region according to the curved surface portion and the plane portion;
the step of setting 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 in the bending region and the non-bending region, raising the first alignment voltage to a second alignment voltage in a first preset time, and keeping the second alignment voltage constant for a second preset time so as to enable liquid crystals in the liquid crystal layer to deflect to a first pretilt angle;
in the bending region, 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 liquid crystals in the liquid crystal layer deflect to a second pretilt angle; wherein the second pretilt is less than the first pretilt; or alternatively, the first and second heat exchangers may be,
the step of bending the display panel includes: bending the display panel integrally to form a curved panel;
the step of setting the pretilt angle of the liquid crystal in the liquid crystal layer further comprises: dividing the display panel into a plurality of bending areas according to the bending degree of the curved plate;
the step of setting the pretilt angle of the liquid crystal in the liquid crystal layer includes:
applying the first alignment voltage between the first substrate and the second substrate in a plurality of bending areas, raising 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 is deflected to the first pretilt angle;
in the bending areas, the second alignment voltage is reduced to the third alignment voltage in the third preset time, and the third alignment voltage is kept constant 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;
the preparation method further comprises the following steps:
and carrying out optical alignment on the display panel so that the first pretilt angle and the second pretilt angle of the liquid crystal close to the first substrate and the second substrate in the liquid crystal layer are fixed.
2. The method of manufacturing a liquid crystal panel according to claim 1, wherein the first alignment voltage ranges from 0 to 12V, the second alignment voltage ranges from 14 to 18V, and the third alignment voltage ranges from 10 to 12V.
3. The method of manufacturing a liquid crystal panel according to claim 1, wherein 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 3-10s.
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 preset time, the first alignment voltage is increased to the second alignment voltage in a stepwise manner in multiple stages;
in the step of reducing the second alignment voltage to the third alignment voltage in the third preset time, the second alignment voltage is reduced to the third alignment voltage in a multistage step mode.
5. The method for manufacturing a liquid crystal panel according to claim 1, wherein the step of optically aligning the display panel specifically comprises:
in the step of applying an alignment voltage between the first substrate and the second substrate, a first ultraviolet irradiation is performed simultaneously, so that a second pretilt angle of liquid crystal in the liquid crystal layer, which is close to the first substrate and the second substrate, is fixed.
6. The method of manufacturing a liquid crystal panel according to claim 5, wherein the step of photoaligning the display panel further comprises:
performing second ultraviolet irradiation on the display panel; wherein the time or intensity of the second ultraviolet irradiation is greater than the time or intensity of the first ultraviolet irradiation.
7. A display panel, characterized in that the display panel is manufactured by the manufacturing method of the liquid crystal panel according to any one of claims 1 to 6.
8. The display panel of claim 7, wherein the display panel is at least partially folded to form a fold, the display panel comprising: the liquid crystal display 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 away from the second substrate; wherein the transmittance of the liquid crystal layer of the bending part is more than 20%.
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| CN102112911A (en) * | 2008-08-05 | 2011-06-29 | 夏普株式会社 | Liquid crystal display device and method for manufacturing the same |
| CN111025770A (en) * | 2019-12-09 | 2020-04-17 | 深圳市华星光电半导体显示技术有限公司 | Manufacturing method of display panel and electronic equipment |
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| JPH0950034A (en) * | 1995-08-09 | 1997-02-18 | Toshiba Corp | Liquid crystal display device and its production |
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| CN104062818B (en) * | 2014-06-27 | 2017-10-24 | 上海天马微电子有限公司 | A kind of Liquid crystal disply device and its preparation method |
| CN106918955B (en) * | 2017-05-11 | 2019-09-13 | 京东方科技集团股份有限公司 | A kind of smooth alignment apparatus and method, liquid crystal display panel |
| JP7180247B2 (en) * | 2018-09-28 | 2022-11-30 | Dic株式会社 | Method for manufacturing liquid crystal display element |
| CN111208676B (en) * | 2020-03-05 | 2021-08-03 | Tcl华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
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| JP2000066208A (en) * | 1998-06-09 | 2000-03-03 | Matsushita Electric Ind Co Ltd | Parallel aligned liquid crystal display element and its production |
| CN102112911A (en) * | 2008-08-05 | 2011-06-29 | 夏普株式会社 | Liquid crystal display device and method for manufacturing the same |
| CN111025770A (en) * | 2019-12-09 | 2020-04-17 | 深圳市华星光电半导体显示技术有限公司 | Manufacturing method of display panel and electronic equipment |
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