Negative liquid crystal mixture, display panel, display device, and driving method

Abstract

The application discloses a negative liquid crystal mixture, a display panel, a display device and a driving method, relates to the technical field of display, and can improve the production line problem of the matching of a rubbing alignment process and a negative liquid crystal material. The negative liquid crystal mixture comprises a negative liquid crystal, a medium-polarity negative monomer, a hindered amine stabilizer and an antioxidant. The content of dithiophene is reduced or even removed in the negative liquid crystal mixture, so that the stain and residual image of the display panel can be obviously improved. The content of dithiophene is reduced, and then the medium-polarity negative monomer, i.e. the medium-polarity negative monomer, is added to make up for the characteristic loss caused by the removal of the high-negativity large-refractive-index monomer dithiophene. The content of the antioxidant and the hindered amine stabilizer is increased in the negative liquid crystal material system, the stability of the benzene ring monomer in the negative liquid crystal material is improved, and then the thermal-optical stability of the negative liquid crystal material system is improved, and the stain and residual image characteristics of the negative liquid crystal material are improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a negative liquid crystal mixture, a display panel, a display device, and a driving method. Background Art

[0002] With the continuous advancement of display technology, negative liquid crystals are increasingly being used in LCD products. These are primarily used in small and medium-sized products and are compatible with optical alignment methods. However, for high-generation production lines, display panel production is limited by the size of optical alignment equipment. Consequently, high-generation production lines typically use a combination of rubbing alignment and negative liquid crystals. However, this combination of negative liquid crystals and rubbing alignment processes can easily lead to image retention issues in the display. Summary of the Invention

[0003] The embodiments of the present application provide a negative liquid crystal mixture, a display panel, a display device, and a driving method, which can improve the production line problem of combining a rubbing alignment process with a negative liquid crystal material.

[0004] According to a first aspect of the present application, a negative liquid crystal mixture is provided, comprising:

[0005] Negative liquid crystal, medium polarity negative monomer, hindered amine stabilizer and antioxidant.

[0006] In some embodiments, the negative liquid crystal mixture further comprises:

[0007] Dibenzothiophene, wherein the mass percentage of the dibenzothiophene ranges from 0% to 6.4%.

[0008] In some embodiments, the mass percentage of the neutral polarity negative monomer ranges from 10% to 60%; and / or,

[0009] The hindered amine stabilizer accounts for less than 0.3% by mass; and / or,

[0010] The antioxidant accounts for less than 0.1% by weight.

[0011] In some embodiments, the chemical structure of the medium-polar negative monomer comprises at least one of 4-propyl bicyclohexyl-2,3-difluoro anisole, 4-propyl bicyclohexyl-2,3-difluoro phenetole, 4-butyl bicyclohexyl-2,3-difluoro phenetole, 4-propyl bicyclohexyl-2,3-difluoro propylphenetole, 4-pentyl bicyclohexyl-2,3-difluoro phenetole, 4-ethyl cyclohexyl phenyl-2,3-difluoro phenetole, trans-propyl cyclohexyl phenyl-2,3-difluoro phenetole, 4-(4-ethoxy-2,3-difluoro-phenyl)-4'-propyl bicyclohexyl-3-ene, 4-(4-propoxy-2,3-difluoro-phenyl)-4'-propyl bicyclohexyl-3-ene, 4-(4-butoxy-2,3-difluoro-phenyl)-4'-ethyl bicyclohexyl-3-ene, 4-(4-ethoxy-2,3-difluoro-phenyl)-4'-butyl bicyclohexyl-3-ene, 4-(4-ethoxy-2,3-difluoro-phenyl)-4'-pentyl bicyclohexyl-3-ene.

[0012] In a second aspect, the present application provides a display panel, comprising:

[0013] a liquid crystal layer, wherein the liquid crystal layer comprises the negative liquid crystal mixture according to the first aspect.

[0014] In some embodiments, the display panel further comprises:

[0015] an alignment film, wherein the liquid crystal layer is disposed between the first alignment film and the second alignment film.

[0016] The alignment film comprises an alignment layer, a low-conductivity layer and a high-conductivity layer, the low-conductivity layer is disposed between the alignment layer and the high-conductivity layer, and the alignment layer is disposed close to the liquid crystal layer.

[0017] In some embodiments, the alignment layer is obtained by heat pre-solidification and linearly polarized light irradiation of an alignment material; and / or,

[0018] The alignment angle of the alignment film is obtained by rubbing alignment with a rubbing cloth made of cotton fabric; and / or,

[0019] The resistivity of the alignment layer and the high-conductivity layer is greater than the resistivity of the low-conductivity layer.

[0020] In some embodiments, the display panel further comprises:

[0021] an array substrate disposed on one side of the liquid crystal layer, wherein the array substrate comprises a pixel electrode and a common electrode.

[0022] The orthographic projection of the pixel electrode on the array substrate falls within the orthographic projection of the common electrode on the array substrate.

[0023] In some embodiments, the pixel electrode is disposed on a side of the common electrode close to the liquid crystal layer; or,

[0024] The pixel electrode is arranged on a side of the common electrode away from the liquid crystal layer.

[0025] In some embodiments, the array substrate includes a plurality of sub-pixel regions, and each sub-pixel region is correspondingly provided with one pixel electrode;

[0026] The pixel electrode in each sub-pixel region includes a first comb electrode and a second comb electrode connected to each other, the openings of the first comb electrode and the second comb electrode face opposite directions, and the first comb electrode and the second comb electrode are connected through the same comb tooth structure.

[0027] In some embodiments, the first comb-shaped electrode and / or the second comb-shaped electrode includes at least two comb-tooth structures; and / or,

[0028] The number of the comb-teeth structures of the first comb-shaped electrode is greater than the number of the comb-teeth structures of the second comb-shaped electrode.

[0029] In some embodiments, the display panel further includes:

[0030] a color filter substrate, disposed on a side of the liquid crystal layer away from the array substrate;

[0031] an upper polarizer, disposed on a side of the color filter substrate away from the liquid crystal layer;

[0032] A phase retardation film is provided between the color filter substrate and the liquid crystal layer, and / or the phase retardation film is provided between the color filter substrate and the upper polarizer.

[0033] In some embodiments, the phase retardation film includes a first phase retardation film and a second phase retardation film, the first phase retardation film is arranged between the color filter substrate and the liquid crystal layer, and the second phase retardation film is arranged between the color filter substrate and the upper polarizer.

[0034] In some embodiments, the first phase delay film and the second phase delay film have different phase delay amounts in the first direction, and / or the first phase delay film and the second phase delay film have different phase delay amounts in the second direction, the first direction and the second direction are perpendicular to each other, and the first direction and the second direction are polarization directions of light.

[0035] According to a third aspect of the embodiments of the present application, a display device is provided, including:

[0036] The display panel as described in the second aspect.

[0037] According to a fourth aspect of the present application, a method for driving a display panel is provided, which is applied to the display panel according to the second aspect. The method includes:

[0038] The positive voltage and / or the negative voltage driving the liquid crystal molecules of the liquid crystal layer to flip is adjusted to reduce the difference between the absolute value of the positive voltage and the absolute value of the negative voltage driving the liquid crystal molecules to flip.

[0039] In some embodiments, adjusting the positive voltage and / or negative voltage that drives the liquid crystal molecules of the liquid crystal layer to flip so as to reduce the difference between the absolute value of the positive voltage and the absolute value of the negative voltage that drives the liquid crystal molecules to flip includes:

[0040] The positive voltage and / or the negative voltage driving the liquid crystal molecules to flip are adjusted so that the absolute value of the positive voltage driving the liquid crystal molecules to flip is equal to the absolute value of the negative voltage.

[0041] The negative liquid crystal mixture, display panel, display device, and driving method provided in the embodiments of the present application can significantly improve the stains and afterimages of the display panel by reducing or even completely removing the content of diphenylthiophene in the negative liquid crystal mixture. The content of diphenylthiophene is reduced, and then a medium-negative high-refractive-index monomer material, i.e., a medium-polarity negative monomer, is added to compensate for the loss of properties caused by removing the highly negative high-refractive-index monomer diphenylthiophene. The content of antioxidants and hindered amine stabilizers is increased in the negative liquid crystal material system to improve the stability of the benzene ring monomer in the negative liquid crystal material, thereby improving the thermal and optical stability of the negative liquid crystal material system and improving the stain and afterimage characteristics of the negative liquid crystal material. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic structural diagram of a display panel provided in an embodiment of the present application;

[0043] Figure 2 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0044] Figure 3 A schematic structural diagram of an alignment film provided in an embodiment of the present application;

[0045] Figure 4 A schematic structural diagram of an array substrate provided in an embodiment of the present application;

[0046] Figure 5 A schematic diagram of the positional relationship between a pixel electrode and the common electrode provided in an embodiment of the present application;

[0047] Figure 6A schematic structural diagram of a pixel electrode provided in an embodiment of the present application;

[0048] Figure 7 A schematic diagram of the positional relationship between another pixel electrode and the common electrode provided in an embodiment of the present application;

[0049] Figure 8 A schematic diagram of the positional relationship between another pixel electrode and the common electrode provided in an embodiment of the present application;

[0050] Figure 9 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0051] Figure 10 A schematic structural diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0053] In this article, relational terms such as first and second are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. The term "more than two" includes two or more than two situations.

[0054] With the continuous advancement of display technology, negative liquid crystals are increasingly being used in LCD products. These are primarily used in small and medium-sized products and are compatible with optical alignment methods. However, for high-generation production lines, display panel production is limited by the size of optical alignment equipment. Consequently, high-generation production lines typically use a combination of rubbing alignment and negative liquid crystals. However, this combination of negative liquid crystals and rubbing alignment processes can easily lead to image retention issues in the display.

[0055] Therefore, the embodiment of the present application provides a negative liquid crystal mixture, a display panel, a display device and a driving method, which can improve the yield line problem of the rubbing alignment process and the negative liquid crystal material.

[0056] In a first aspect, the embodiment of the present application provides a negative liquid crystal mixture, comprising: a negative liquid crystal, a medium-polarity negative monomer, a hindered amine stabilizer and an antioxidant.

[0057] It should be noted that, due to the difficulty in separating the auxiliary agent during the synthesis of the negative liquid crystal, the mixed crystal quality is low, and the impurity content is high; the negative liquid crystal material contains a large-polarity unstable monomer, the large-polarity unstable monomer generates impurity ions in the preparation process of the negative liquid crystal material, thereby causing the display product to have poor stain and residual image problems; in addition, the different electron cloud distributions of the negative liquid crystal monomers make their ion affinity energy higher, and they are more likely to generate or adsorb impurity ions, thereby causing the display screen to have a residual image problem.

[0058] To solve the above problems, the large-polarity unstable monomer can be removed, and to make up for the loss of characteristics caused by the removal of the large-polarity unstable monomer, a medium-polarity negative monomer can be added. For example, the large-polarity negative liquid crystal monomer can be a high-negative large-refractive-index monomer, such as a dibenzothiophene, and the medium-polarity negative monomer can be a medium-negative monomer with a large refractive index. It should be noted that the hindered amine stabilizer can be a thermal stabilizer or a light stabilizer, which can improve the thermal stability and light stability of the negative liquid crystal material.

[0059] The negative liquid crystal mixture provided by the embodiment of the present application can compensate for the loss of characteristics caused by the removal of the high-negative large-refractive-index monomer by adding the medium-polarity negative monomer, and increase the content of the hindered amine stabilizer and the antioxidant, thereby improving the light and thermal stability of the negative liquid crystal material system.

[0060] In some embodiments, the negative liquid crystal mixture provided by the embodiment of the present application further comprises: dibenzothiophene, and the mass percentage of the dibenzothiophene ranges from 0% to 6.4%.

[0061] In some embodiments, the mass percentage of the medium-polarity negative monomer ranges from 10% to 60%, the mass percentage of the hindered amine stabilizer is less than 0.3%, and the mass percentage of the antioxidant is less than 0.1%.

[0062] For example, a 0% mass fraction of dibenzothiophene represents the removal of dibenzothiophene from the negative liquid crystal mixture. This means that highly polar and unstable monomers, such as dibenzothiophene, are removed and replaced with relatively stable monomer structures, such as neutral polarity negative monomers. The photothermal stability of the material system is improved by increasing the content of hindered amine stabilizers and antioxidants. The dibenzothiophene content cannot be too high. Dibenzothiophene materials requiring high negativity and a high refractive index need to be used in conjunction with neutral negative and high refractive index materials. The dibenzothiophene content is typically estimated to be between 2% and 15%. If the dibenzothiophene content is too high, even adding a hindered amine stabilizer will result in display afterimages. Replacing the dibenzothiophene material with a neutral and high refractive index material can achieve a substantially similar response time. Furthermore, the increased content of hindered amine stabilizers and antioxidants is preferably between 0.005% and 0.1%. Because dibenzothiophene is unstable when exposed to heat and light, impurity ions are generated during the preparation of negative liquid crystal materials, leading to noticeable staining and image retention in the product. Furthermore, dibenzothiophene is highly polar but unstable. A negative liquid crystal mixture containing 6.4% dibenzothiophene exhibits highly polar electric field response characteristics, which improves response time. However, due to its instability when exposed to heat and light, impurity ions are generated during sample preparation, resulting in slightly worse staining and image retention in the product. Reducing or even completely eliminating the dibenzothiophene content can significantly improve staining and image retention in display panels. Reducing the dibenzothiophene content and then adding a medium-negative, high-refractive-index monomer (i.e., a medium-polarity negative monomer) can compensate for the property loss caused by removing the highly negative, high-refractive-index monomer dibenzothiophene. Increasing the content of antioxidants and hindered amine stabilizers in the negative liquid crystal material system improves the stability of the benzene ring monomer, thereby enhancing the thermal and optical stability of the negative liquid crystal system and improving the stain and image retention characteristics of the negative liquid crystal material.

[0063] In some embodiments, the chemical structure of the neutral polar negative monomer includes: 4-propyl biscyclohexyl-2,3-difluoroanisole, chemical structure such as formula 1-1; 4-propyl biscyclohexyl-2,3-difluorophenyl ether, chemical structure such as formula 1-2; 4-butyl biscyclohexyl-2,3-difluorophenyl ether, chemical structure such as formula 1-3; 4-propyl biscyclohexyl-2,3-difluorophenyl ether, chemical structure such as formula 1-4; 4-pentyl biscyclohexyl-2,3-difluorophenyl ether, chemical structure such as formula 1-5; 4-ethylcyclohexylphenyl-2,3-difluorophenyl ether, chemical structure such as formula 1-6; trans-propyl cyclohexylphenyl-2,3-difluorophenyl ether, chemical structure such as formula 1-7; 4- (4-Ethoxy-2,3-difluoro-phenyl)-4′-propylbiscyclohexyl-3-ene, the chemical structure is as shown in Formula 1-8; the chemical structure is as shown in Formula 1-9; 4-(4-propoxy-2,3-difluoro-phenyl)-4′-propylbiscyclohexyl-3-ene, the chemical structure is as shown in Formula 1-10; 4-(4-butoxy-2,3-difluoro-phenyl)-4′-ethylbiscyclohexyl-3-ene, the chemical structure is as shown in Formula 1-11; 4-(4-ethoxy-2,3-difluoro-phenyl)-4′-butylbiscyclohexyl-3-ene, the chemical structure is as shown in Formula 1-12; 4-(4-ethoxy-2,3-difluoro-phenyl)-4′-pentylbiscyclohexyl-3-ene, the chemical structure is as shown in Formula 1-13.

[0064]

[0065]

[0066] For example, the chemical structure of the unstable monomer with high polarity and high refractive index can be as shown in Formula 2-1.

[0067]

[0068] For example, the chemical structural formula of the hindered amine stabilizer is shown in Formula 3-1, and the structure of R in Formula 3-1 can be shown in Formula 3-2.

[0069]

[0070] According to a second aspect of the present application, a display panel is provided. Figure 1 This is a schematic structural diagram of a display panel provided in an embodiment of the present application. Figure 1 As shown, the display panel provided in the embodiment of the present application includes: a liquid crystal layer 100, wherein the liquid crystal layer 100 includes the negative liquid crystal mixture as described in the first aspect. The display panel also includes an array substrate 200 and a color filter substrate 300. The liquid crystal layer 100 is disposed between the array substrate 200 and the color filter substrate 300. A driver device is disposed on the array substrate 200, and a color filter film is disposed on the driver device color filter substrate 300.

[0071] The display panel provided in the embodiment of the present application can significantly improve the stains and afterimages of the display panel by reducing or even completely removing the content of diphenylthiophene in the negative liquid crystal mixture. The content of diphenylthiophene is reduced, and then a medium-negative high-refractive index monomer material, i.e., a medium-polarity negative monomer, is added to compensate for the loss of properties caused by removing the highly negative high-refractive index monomer diphenylthiophene. Increasing the content of antioxidants and hindered amine stabilizers in the negative liquid crystal material system improves the stability of the benzene ring monomer in the negative liquid crystal material, thereby improving the thermal and optical stability of the negative liquid crystal material system and improving the stain and afterimage characteristics of the negative liquid crystal material.

[0072] In some embodiments, Figure 2 A schematic structural diagram of another display panel provided in an embodiment of the present application; Figure 3 This is a schematic structural diagram of an alignment film provided in an embodiment of the present application. Figure 2 As shown, the display panel also includes: an alignment film, including a first alignment film 410 and a second alignment film 420, and the liquid crystal layer 100 is arranged between the first alignment film 410 and the second alignment film 420; the alignment film includes an alignment layer 401, a low conductivity layer 402 and a high conductivity layer 403, the low conductivity layer 402 is arranged between the alignment layer 401 and the high conductivity layer 403, and the alignment layer 401 is arranged close to the liquid crystal layer 100.

[0073] In some embodiments, the alignment layer is obtained by pre-curing the alignment material with heat and irradiating it with linearly polarized light; the alignment angle of the alignment film is obtained by rubbing with a rubbing cloth made of cotton cloth; the resistivity of the alignment layer and the high conductivity layer is greater than the resistivity of the low conductivity layer.

[0074] In some embodiments, if the same alignment material, such as PI (polyimide), is used and different liquid crystal materials are used to match it, the VHR (Voltage Holding Ratio) will be different. For example, if the same PI is used with a traditional negative liquid crystal material, the VHR is poor. If the negative liquid crystal material described in the first aspect is used, the VHR will be greatly improved. In the display panel provided in the embodiment of the present application, the PI is formed into a three-layer structure after preparation. The alignment layer 401 closest to the liquid crystal layer 100 is a light alignment layer with a high alignment force after pre-curing and linear polarized light irradiation. The main function of the alignment layer 401 is to ensure the directional arrangement of the liquid crystal molecules and change the AC (alternating current) afterimage. The resistivity is usually greater than 1015Ω·cm. The low conductivity layer 402 is a low-resistance conductive layer with a resistivity less than 1014Ω·cm, which is used to improve the release of direct current. The high conductivity layer 403 can be used to improve the stability of Vcom (common voltage) and improve VHR, avoiding afterimages and flickering problems caused by charge accumulation.

[0075] The alignment film provided in the embodiment of the present application has one more layer than the conventional double-layer PI structure. The added high conductivity layer 403 is more conducive to improving the uniformity of the Vcom and VHR value of the PI, which is beneficial to the improvement of afterimages and flickering. The three-layer alignment film setting reduces the pre-tilt angle. For example, the Δangle (alignment angle) of the double-layer alignment film is 1.01°, and the Δangle of the three-layer alignment film is 0.68°. In terms of VHR, the initial VHR of the double-layer structure is equivalent to that of the three-layer structure, but after high-temperature aging testing, the VHR of the three-layer PI material is only slightly reduced, that is, from 84% to 83.2%, which is much higher than the level of the double-layer PI, that is, 84.7% to 71.6%. In addition, for DC release, the three-layer PI has a faster DC release speed, which is half the level of the double-layer PI, which is beneficial to the improvement of afterimages. In addition, for PI materials, a negative liquid crystal mixture with a hindered amine stabilizer added thereto can allow the negative liquid crystal mixture to form hydrogen bonds with the residual reactive groups of PI, attaching to the surface of PI and blocking the precipitation of PI ions into the liquid crystal to form a free state, which helps to improve the stains of the negative liquid crystal.

[0076] For example, when using the same liquid crystal test, the afterimage level of a PI with a three-layer structure was lower than that of a two-layer structure. The afterimage level of the three-layer structure was maintained at Level 11.5, while that of the two-layer structure was at Level 2. The higher the level, the worse the afterimage. Furthermore, the grayscale at which the afterimage disappears was also reduced and improved to a certain extent. The grayscale disappearance of the three-layer structure was basically 147 within 10 hours, and remained at 167 after 10 hours, which is an improvement over the two-layer structure.

[0077] For example, in addition to the PI material, PI-related processes also have a corresponding impact on afterimages. For example, impurities in the color filter substrate and PI can precipitate onto the PI surface, enter the liquid crystal, and form free states, affecting the VHR and causing poor afterimages. Strengthening the cleaning of the PI and color filter substrate can reduce stains caused by ion precipitation. Furthermore, using UV-resistant PI materials and those with trap groups (triazacyclononanephosphinic acid) can effectively reduce ion precipitation.

[0078] For example, in addition to the PI material, the PI alignment process will affect the PI alignment angle. Optimizing the PI process can improve the PI alignment ability and improve AC afterimages. For example, the pre-tilt angle can be improved by optimizing the PI rubbing cloth. Taking nylon and cotton cloth as examples, the pre-tilt angles of different rubbing cloths under the same alignment conditions vary greatly. For example, using cotton cloth 90ic can effectively reduce the pre-tilt angle compared to nylon RayonHY-T116. This effect is effective for both positive and negative liquid crystals. For example, for positive liquid crystals, the pre-tilt angle is reduced from 0.68 to 0.38 by using cotton cloth rubbing alignment. For negative liquid crystals, the pre-tilt angle is reduced from 1.10 to 0.54 by using cotton cloth rubbing alignment, which is about half the reduction.

[0079] In some embodiments, Figure 4 A schematic structural diagram of an array substrate provided in an embodiment of the present application; Figure 5 A schematic diagram of the positional relationship between a pixel electrode and the common electrode provided in an embodiment of the present application. Figure 4 and Figure 5 The array substrate 200 includes a pixel electrode 210 and a common electrode 220. The orthographic projection of the pixel electrode 210 on the array substrate 200 falls within the orthographic projection of the common electrode 220 on the array substrate 200. The pixel electrode 210 is disposed on a side of the common electrode 220 close to the liquid crystal layer 100.

[0080] In some embodiments, the pixel electrode 210 is disposed on a side of the common electrode 220 away from the liquid crystal layer 100. The positions and shapes of the common electrode 220 and the pixel electrode 210 can be set according to specific electrical requirements.

[0081] In some embodiments, reference Figure 4 The array substrate 200 includes a plurality of sub-pixel regions 230 , and each sub-pixel region 230 is correspondingly provided with a pixel electrode 210 .

[0082] In some embodiments, Figure 6 This is a schematic structural diagram of a pixel electrode provided in an embodiment of the present application. Figure 6 As shown, the pixel electrode 210 in each sub-pixel region 230 includes a first comb-shaped electrode 211 and a second comb-shaped electrode 212 that are connected to each other. The first comb-shaped electrode 211 and the second comb-shaped electrode 212 are connected through the same comb-tooth structure, that is, the first comb-shaped electrode 211 and the second comb-shaped electrode 212 are connected through a common comb-tooth structure 201. It is easy to understand that the comb-tooth structure connecting the first comb-shaped electrode 211 and the second comb-shaped electrode 212 is the common comb-tooth structure 201 that is shared by each other. The openings of the first comb-shaped electrode 211 and the second comb-shaped electrode 212 are oriented in opposite directions, that is, the first opening 202 of the first comb-shaped electrode 211 and the second opening 203 of the second comb-shaped electrode 212 are oriented in opposite directions.

[0083] In some embodiments, the first comb-shaped electrode 211 may include at least two comb-tooth structures, and the second comb-shaped electrode 212 may include at least two comb-tooth structures. Figure 6 , the shape of the pixel electrode 210 is similar to the traditional Chinese character “马”.

[0084] Exemplarily, the number of comb-teeth structures of the first comb-shaped electrode 211 is greater than the number of comb-teeth structures of the second comb-shaped electrode 212 .

[0085] The “H”-shaped pixel design provided in the embodiment of the present application can reduce the electric field effect on the long side of the pixel and improve transmittance, typically achieving an estimated transmittance increase of 15% to 25%.

[0086] For example, Figure 7 This is another schematic diagram of the positional relationship between the pixel electrode and the common electrode provided in an embodiment of the present application. Figure 7 As shown, the pixel electrode 210 is outwardly extended relative to the common electrode 220. The electric field formed by the pixel electrode 210 and the data signal is too strong, and the liquid crystal molecules 101 are deflected, resulting in light leakage, and the crosstalk will be worsened. Figure 8 This is another schematic diagram of the positional relationship between the pixel electrode and the common electrode provided in an embodiment of the present application. Figure 8 As shown, the pixel electrode 210 is retracted relative to the common electrode 220. Furthermore, the pixel electrode 210 is disposed between the common electrode 220 and the liquid crystal layer 100, meaning that the pixel electrode 210 is disposed on the top layer. The electric field of the data signal is shielded by the pixel electrode, and the liquid crystal molecules 101 at the edge of the pixel electrode 210 are not deflected, resulting in no black-white crosstalk. Furthermore, the arrangement of the pixel electrode and common electrode provided in the embodiments of the present application can improve transmittance, with an estimated 18% increase in transmittance.

[0087] In some embodiments, Figure 9 This is a schematic structural diagram of another display panel provided in an embodiment of the present application. Figure 9 As shown, the display panel further includes a lower polarizer 500, an upper polarizer 600 and a phase delay film. Figure 9The phase retardation film includes a first phase retardation film 710 and a second phase retardation film 720. The first phase retardation film 710 is arranged between the color filter substrate 300 and the liquid crystal layer 100, and the second phase retardation film 720 is arranged between the color filter substrate 300 and the upper polarizer 600. The first phase retardation film 710 and the second phase retardation film 720 have different phase retardation amounts in the first direction. In some embodiments, the first phase retardation film 710 and the second phase retardation film 720 have different phase retardation amounts in the second direction. The first direction and the second direction are perpendicular to each other, and the first direction and the second direction are polarization directions of light. The polarization direction of any polarized light can be decomposed in the first direction and the second direction to obtain the polarization components in the corresponding directions.

[0088] It should be noted that large-size display panels usually have whitening at large viewing angles. This is mainly because the non-orthogonality of the large-viewing angle polarizer causes light leakage, which dilutes the pure R / G / B (red / green / blue) display colors and makes the display colors white. In addition, for conventional-sized TV screens, there are generally severe stress leakage and uneven touch colors. The large-viewing angle whitening compensation polarizer can be used to improve the large-viewing angle whitening problem within a certain range, but it still does not improve the problem of stress leakage.

[0089] To address these issues, the display panel provided in the present embodiment incorporates a stress-leakage optical compensation design based on wide-viewing angle whitening compensation. By employing a first phase retardation film 710 and a second phase retardation film 720, combined with the existing "H"-shaped pixel design, both wide-viewing angle whitening and stress-leakage can be mitigated. The phase retardation films compensate for the orthogonal angle between the upper polarizer 600 and the lower polarizer 500, ensuring color shift, wide-viewing angle whitening, and dark-state light leakage in the negative liquid crystals are eliminated, significantly improving product quality and restoring display color by compensating for wide-viewing angle light leakage.

[0090] For example, the brightness of the wide-angle light leakage is large and the color is light yellow, or the color of the wide-angle light leakage is relatively bright and easily noticeable to the human eye. Due to the low brightness of the wide-angle light leakage, the color cast is a dark purple that is not easily noticeable to the human eye, and the color of the compressed light leakage is also a blue that the human eye is less sensitive to. Optical compensation can be performed by setting a first phase delay film 710 and a second phase delay film 720, so that wide-angle light leakage compensation and wide-angle compatibility can be achieved. It should be noted that the method of using a phase delay film for optical compensation is low in cost and easy to implement. In addition, the phase delay film can be integrated into the polarizer, which is not specifically limited in the embodiments of the present application.

[0091] According to a third aspect of the present application, a display device is provided. Figure 10 This is a schematic structural diagram of a display device provided in an embodiment of the present application. Figure 10As shown, the display device includes: the display panel 1000 as described in the second aspect.

[0092] It should be noted that the display device provided in the embodiments of the present application may include displays such as smart phones, tablet computers, laptop computers, and televisions, and the embodiments of the present application do not specifically limit this.

[0093] According to a fourth aspect of the present application, a method for driving a display panel is provided, which is applied to the display panel according to the second aspect. The method includes:

[0094] The positive voltage and / or the negative voltage driving the liquid crystal molecules of the liquid crystal layer to flip is adjusted to reduce the difference between the absolute value of the positive voltage and the absolute value of the negative voltage driving the liquid crystal molecules to flip.

[0095] The adjusting of the positive voltage and / or the negative voltage driving the liquid crystal molecules of the liquid crystal layer to flip so as to reduce the difference between the absolute value of the positive voltage and the absolute value of the negative voltage driving the liquid crystal molecules to flip comprises:

[0096] The positive voltage and / or negative voltage for driving the liquid crystal molecules to flip is adjusted so that the absolute value of the positive voltage for driving the liquid crystal molecules to flip is equal to the absolute value of the negative voltage.

[0097] It should be noted that the positive and negative voltages that drive the flipping of liquid crystal molecules are usually symmetrical, that is, their absolute values ​​are equal. However, during long-term operation, due to factors such as signal attenuation and signal interference, the positive and negative voltages will shift to varying degrees, resulting in asymmetry between the positive and negative voltages. This affects the flipping drive of the liquid crystal molecules and can easily lead to poor afterimages. Asymmetric voltage compensation optimization can be used to reduce the difference in the absolute values ​​of the positive and negative voltages, and even to compensate the absolute values ​​of the positive and negative voltages to be equal. Specifically, the positive and negative voltage values ​​can be gradually increased or decreased, and the afterimage results can be observed over a period of 2 hours.

[0098] For example, Table 1 shows the 2h afterimage level data corresponding to positive and negative voltages provided in an embodiment of the present application. The higher the level, the worse the afterimage effect.

[0099] 255 grayscale positive voltage / V 255 grayscale negative voltage / V 2h afterimage level 5.4 -5.2 3 5.3 -5.3 2.5 5.2 -5.4 2 5.1 -5.5 1.5 5 -5.6 1 4.9 -5.7 2

[0100] Table 1

[0101] For example, Table 2 shows the image retention level data corresponding to asymmetric voltage compensation according to an embodiment of the present application. Different PI materials have different resistivities, resulting in different asymmetric voltage compensation effects. For Table 1, the compensation voltage can be applied to the positive voltage.

[0102] PI resistivity (Ω·cm) Compensation voltage / V 2h afterimage level 4h afterimage level 8h afterimage level <![CDATA[10 12 ]]> -0.1 1 1 1 10 13 ]] -0.2 1 1.5 2 <![CDATA[10 15 ]]> -0.3 1.5 2 3

[0103] Table 2

[0104] For example, different pixel structure designs (top com and top pixel) require different voltage compensation test settings. A top com (i.e., the common electrode is between the pixel electrode and the liquid crystal layer) and a top pixel (i.e., the pixel electrode is between the common electrode and the liquid crystal layer) can be expressed as a mid com. The compensation voltage can be applied to either a positive or negative voltage. Table 3 shows the residual image level data corresponding to voltage compensation for a pixel electrode design provided in an embodiment of the present application.

[0105] Pixel structure 255 grayscale negative voltage / V 2h afterimage level top com -0.3 1.5 mid com 0.3 1.5

[0106] Table 3

[0107] It should be noted that a 2h afterimage level of less than 2 can meet the display effect requirements.

[0108] It should be noted that, in the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0109] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-readable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-readable program code.

[0110] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0111] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0112] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0113] An embodiment of the present application further provides a computer program product, which includes computer software instructions. When the computer software instructions are executed on a processing device, the processing device executes the process of the display panel driving method.

[0114] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, a process or function according to an embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. Computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. A computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or data center that includes one or more available media integrations. Available media may be magnetic media (e.g., floppy disk, hard disk, tape), optical media (e.g., DVD), or semiconductor media (e.g., solid-state disk (SSD)), etc.

[0115] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0116] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0117] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0118] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0119] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0120] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0121] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0122] Obviously, those skilled in the art may make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if such changes and modifications fall within the scope of the claims of this specification and their equivalents, this specification is intended to include such changes and modifications.

Claims

1. A display panel, characterized in that: include: A liquid crystal layer comprising a negative liquid crystal mixture, wherein the negative liquid crystal mixture comprises a negative liquid crystal, a neutral polarity negative monomer, a hindered amine stabilizer and an antioxidant; An alignment film, comprising a first alignment film and a second alignment film, wherein the liquid crystal layer is disposed between the first alignment film and the second alignment film; The alignment film includes an alignment layer, a low conductivity layer and a high conductivity layer, wherein the low conductivity layer is arranged between the alignment layer and the high conductivity layer, and the alignment layer is arranged close to the liquid crystal layer; The chemical structures of the neutral polar negative monomers include: 4-propyldicyclohexyl-2,3-difluoroanisole, 4-propyldicyclohexyl-2,3-difluorophenylethyl ether, 4-butyldicyclohexyl-2,3-difluorophenylethyl ether, 4-propyldicyclohexyl-2,3-difluorophenylpropyl ether, 4-pentyldicyclohexyl-2,3-difluorophenylethyl ether, 4-ethylcyclohexylphenyl-2,3-difluorophenylethyl ether, trans-propylcyclohexylphenyl-2,3-difluorophenylethyl ether, 4-(4-ethoxy-2,3 At least one of 4-(4-propoxy-2,3-difluoro-phenyl)-4′-propylbicyclohexyl-3-ene, 4-(4-butoxy-2,3-difluoro-phenyl)-4′-ethylbicyclohexyl-3-ene, 4-(4-ethoxy-2,3-difluoro-phenyl)-4′-butylbicyclohexyl-3-ene, and 4-(4-ethoxy-2,3-difluoro-phenyl)-4′-pentylbicyclohexyl-3-ene; The negative liquid crystal mixture further comprises: Dibenzothiophene, wherein the mass proportion of the dibenzothiophene ranges from 0% to 6.4%.

2. The display panel according to claim 1, wherein: The mass proportion of the neutral polarity negative monomer is in the range of 10% to 60%; and / or, The hindered amine stabilizer accounts for less than 0.3% by mass; and / or, The antioxidant accounts for less than 0.1% by mass.

3. The display panel according to claim 1, wherein: The alignment layer is obtained by pre-curing the alignment material with heat and irradiating it with linearly polarized light; and / or, The alignment angle of the alignment film is obtained by rubbing with a rubbing cloth made of cotton cloth; and / or, The resistivity of the alignment layer and the high conductivity layer is greater than the resistivity of the low conductivity layer.

4. The display panel according to claim 1, wherein: Also includes: An array substrate is provided on one side of the liquid crystal layer, and the array substrate includes pixel electrodes and common electrodes; The orthographic projection of the pixel electrode on the array substrate falls within the orthographic projection of the common electrode on the array substrate.

5. The display panel according to claim 4, wherein: The pixel electrode is arranged on a side of the common electrode close to the liquid crystal layer; or, The pixel electrode is arranged on a side of the common electrode away from the liquid crystal layer.

6. The display panel according to claim 4, wherein: The array substrate includes a plurality of sub-pixel regions, and each sub-pixel region is correspondingly provided with one pixel electrode; The pixel electrode in each sub-pixel region includes a first comb electrode and a second comb electrode connected to each other, the openings of the first comb electrode and the second comb electrode face opposite directions, and the first comb electrode and the second comb electrode are connected through the same comb tooth structure.

7. The display panel according to claim 6, wherein: The first comb-shaped electrode and / or the second comb-shaped electrode includes at least two comb-tooth structures; and / or, The number of the comb-teeth structures of the first comb-shaped electrode is greater than the number of the comb-teeth structures of the second comb-shaped electrode.

8. The display panel according to claim 4, wherein: Also includes: a color filter substrate, disposed on a side of the liquid crystal layer away from the array substrate; an upper polarizer, disposed on a side of the color filter substrate away from the liquid crystal layer; A phase retardation film is provided between the color filter substrate and the liquid crystal layer, and / or the phase retardation film is provided between the color filter substrate and the upper polarizer.

9. The display panel according to claim 8, wherein: The phase retardation film includes a first phase retardation film and a second phase retardation film. The first phase retardation film is arranged between the color filter substrate and the liquid crystal layer, and the second phase retardation film is arranged between the color filter substrate and the upper polarizer.

10. The display panel according to claim 9, wherein: The first phase delay film and the second phase delay film have different phase delay amounts in the first direction, and / or the first phase delay film and the second phase delay film have different phase delay amounts in the second direction, the first direction and the second direction are perpendicular to each other, and the first direction and the second direction are polarization directions of light.

11. A display device, characterized in that: include: The display panel according to any one of claims 1 to 10.

Images