Display panel and display device

Abstract

The present disclosure relates to a display panel and a display device. The display panel comprises: a substrate; a first electrode disposed on the substrate; a liquid crystal layer on the surface of the first electrode away from the substrate; and a second electrode disposed on the surface of the liquid crystal layer away from the substrate, wherein a saturation voltage of the liquid crystal layer is greater than a maximum working voltage difference between the first electrodes and the second electrodes.

Description

Display panel and display device Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] Liquid crystals are widely used in the display field due to their electro-optical effect. This electro-optical effect refers to an electrical light modulation phenomenon in which the molecular alignment of liquid crystals changes under the influence of an external electric field, causing the optical properties of the liquid crystal cell to change accordingly. Different types of liquid crystal display devices can be created by exploiting different electro-optical effects.

[0003] Liquid crystal displays (LCDs) are widely used. They have many parameters. Contrast ratio is a measure of the difference between a display's maximum and minimum brightness. It's the ratio of the display's maximum and minimum brightness. Response time measures how quickly a display's pixels react to an input signal. Transmittance measures a display's ability to transmit light.

[0004] Summary of the Invention

[0005] Embodiments of the present disclosure provide a display panel. The display panel includes: a substrate; a first electrode on the substrate; a liquid crystal layer on a surface of the first electrode remote from the substrate; and a second electrode on a surface of the liquid crystal layer remote from the substrate, wherein a saturation voltage of the liquid crystal layer is greater than a maximum operating voltage difference between the first electrode and the second electrode.

[0006] In some embodiments, a difference between the saturation voltage of the liquid crystal layer and the maximum operating voltage difference between the first electrode and the second electrode ranges from 0.35V to 5.20V.

[0007] In some embodiments, a difference between a saturation voltage of the liquid crystal layer and the maximum operating voltage difference between the first electrode and the second electrode ranges from 0.50V to 4.00V.

[0008] In some embodiments, the display panel has a contrast ratio of 2200:1 or higher.

[0009] In some embodiments, the display panel has a contrast ratio of 2500:1 or higher.

[0010] In some embodiments, the display panel has a contrast ratio of 2600:1 or higher.

[0011] In some embodiments, the response time of the display panel from the brightest brightness to the darkest brightness is no more than 9 ms.

[0012] In some embodiments, a response time of the display panel from brightest brightness to darkest brightness is 7.42 ms, 7.53 ms, 7.58 ms, 7.68 ms, or 7.72 ms.

[0013] In some embodiments, the response time of the display panel from the darkest brightness to the brightest brightness is no more than 9.5 ms.

[0014] In some embodiments, a response time of the display panel from darkest brightness to brightest brightness is 9.0 ms, 8.44 ms, 8.41 ms, 8.23 ​​ms, or 7.86 ms.

[0015] In some embodiments, the saturation voltage of the liquid crystal layer is above 7.0V.

[0016] In some embodiments, the saturation voltage of the liquid crystal layer is: 8.9V, 9.1V, 9.6V, 9.8V or 10.1V.

[0017] In some embodiments, the liquid crystal comprises negative liquid crystal.

[0018] In some embodiments, the refractive index of the liquid crystal layer is greater than 0.072.

[0019] In some embodiments, the refractive index of the liquid crystal layer is one of the following: 0.0845, 0.0903, 0.0901, 0.101, 0.875, or 0.868.

[0020] In some embodiments, the rotational viscosity of the liquid crystal layer is between 60 mPa·s and 145 mPa·s.

[0021] In some embodiments, the rotational viscosity of the liquid crystal layer is one of the following: 70 mPa·s, 82.5 mPa·s, 83.5 mPa·s, 99.1 mPa·s, 108 mPa·s or 126 mPa·s.

[0022] In some embodiments, the display panel includes at least one of the following: an ADS type display panel, an FFS type display panel, a TN type display panel, an IPS type display panel, and a VA type display panel.

[0023] In some embodiments, the maximum operating voltage difference between the first electrode and the second electrode is between 5.8V and 10.7V.

[0024] An embodiment of the present disclosure further provides a display device, which includes the display panel described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It should be noted that the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0026] FIG1 is a schematic diagram of a display panel according to the present disclosure;

[0027] FIG2 is a diagram showing an exemplary VT curve of a negative liquid crystal;

[0028] FIG3 is a diagram showing an exemplary VT curve of a positive liquid crystal;

[0029] FIG4 is a schematic diagram showing a comparison of VT curves of Comparative Example 1 and Example 1;

[0030] FIG5 is a schematic diagram showing a comparison of VT curves of Comparative Example 2 and Example 2;

[0031] FIG6 is a schematic diagram comparing VT curves of Example 2 and Example 3;

[0032] FIG7 is a schematic diagram comparing VT curves of Example 2 and Example 4;

[0033] FIG8 is a schematic diagram showing a comparison of VT curves of Comparative Example 1 and Example 5;

[0034] FIG9 is a schematic diagram showing a comparison of VT curves of Comparative Example 1 and Example 6;

[0035] FIG. 10 is a schematic diagram of a display device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work also fall within the scope of protection of the present invention.

[0037] When introducing elements of the present invention and the embodiments thereof, the articles "a," "an," "the," and "said" are intended to mean that there are one or more elements. The terms "comprising," "including," "containing," and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.

[0038] For the purpose of the following description, the terms "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," and their derivatives shall refer to the invention as it is oriented in the accompanying drawings. The terms "overlying," "on top of," "positioned on," or "positioned on top of" mean that a first element, such as a first structure, is present on a second element, such as a second structure, wherein an intermediate element, such as an interface structure, may be present between the first and second elements. The term "contacting" means connecting a first element, such as a first structure, and a second element, such as a second structure, with or without other elements at the interface between the two elements.

[0039] Liquid crystals have many parameters, such as phase transition temperature (T m , T c ), bulk viscosity (η), dielectric anisotropy (ε ∥ , ε ⊥ ), optical refractive index (n e , n0), rotational viscosity (γ1), elastic coefficient (K 11 , K 22 , K 33 ) etc. These parameters often restrict each other, bringing challenges to the application of liquid crystal.

[0040] For example, for liquid crystals, high contrast means a high elastic coefficient. A high elastic coefficient means an increase in the liquid crystal's saturation voltage (Vop). An increase in the liquid crystal's saturation voltage (Vop) means the IC may be unable to drive the liquid crystal, necessitating an increase in the dielectric constant to reduce the liquid crystal's saturation voltage Vop. However, an increase in the liquid crystal's dielectric constant increases the liquid crystal's viscosity, which in turn slows the response speed. This makes it difficult to strike a balance between high contrast and fast response.

[0041] In today's increasingly competitive market, negative liquid crystals (LCDs) have been widely used in recent years to pursue higher light transmittance and high contrast. However, negative LCDs also face parameter constraints, making it difficult to achieve a balance between high contrast and fast response. This poses challenges for negative LCD panels entering the high-end market.

[0042] To this end, the inventors have provided a novel solution that is creative and can achieve a balance between contrast and response time.

[0043] FIG1 is a schematic diagram of a display panel according to the present disclosure. As shown in FIG1 , the display panel according to the present disclosure includes: a substrate 1, a first electrode 2 on the substrate 1, a liquid crystal layer 3 on a surface of the first electrode 2 away from the substrate 1, and a second electrode 4 on a surface of the liquid crystal layer away from the substrate 1, wherein the saturation voltage (V op) is greater than the maximum operating voltage (V IC max The maximum operating voltage (V IC max ) refers to the maximum voltage allowed to be applied between the first electrode and the electrode.

[0044] By adopting such a solution, a balance between contrast and response time can be achieved. The embodiments of the present disclosure can also achieve a balance between contrast, transmittance, and response time, reducing response time, maintaining a slight decrease in transmittance or even a higher decrease in contrast, and achieving a slight decrease in contrast or even a higher increase in contrast.

[0045] The "saturation voltage" of the liquid crystal here refers to the voltage-transmittance (VT) curve of the liquid crystal, and the voltage at which the transmittance no longer increases with the increase of the voltage applied to the liquid crystal (for negative liquid crystal), or the voltage at which the transmittance no longer increases with the decrease of the voltage applied to the liquid crystal (for positive liquid crystal).

[0046] Figure 2 is an example of a VT curve of a negative liquid crystal. As shown in Figure 2, the inflection point voltage at which the transmittance no longer increases with the increase of the voltage applied to the liquid crystal is the saturation voltage V of the liquid crystal. op .

[0047] Figure 3 is an example of a VT curve of a positive liquid crystal. As shown in Figure 3, the inflection point voltage at which the transmittance no longer increases with the decrease of the voltage applied to the liquid crystal is the saturation voltage V of the liquid crystal. op .

[0048] One of the first electrode and the second electrode may be a pixel electrode, and the other of the first electrode and the second electrode may be a common electrode. The maximum operating voltage difference between the first electrode and the second electrode may also be referred to as the maximum driving voltage of the driving circuit of the display panel.

[0049] In some embodiments, the difference between the saturation voltage of the liquid crystal layer and the maximum operating voltage difference between the first electrode and the second electrode ranges from 0.35 V to 5.20 V. For example, the difference between the two can be 0.35 V, 0.37 V, 0.45 V, 0.51 V, 0.82 V, 1.07 V, 2.18 V, 2.94 V, 3.03 V, or 3.25 V.

[0050] In some embodiments, the difference between the saturation voltage of the liquid crystal layer and the maximum operating voltage difference between the first electrode and the second electrode ranges from 0.50 V to 4.00 V. For example, the difference between the two can be 0.50 V, 0.70 V, 0.91 V, 1.33 V, 1.49 V, 1.77 V, 2.00 V, 2.32 V, 2.44 V, 2.50 V, 3.00 V, 3.50 V, or 4.00 V.

[0051] In the embodiment, although the liquid crystal layer is set to its saturation voltage V op Set to be greater than the maximum operating voltage V between the first electrode and the second electrode IC max However, in actual operation, the voltage actually applied to the liquid crystal layer can only reach V IC max But can not reach the LCD V op , so that the voltage applied to the liquid crystal layer can reach the liquid crystal saturation voltage V op In this case, there may be some loss of transmittance. However, because the end of the VT curve is relatively flat, especially for negative liquid crystals, the transmittance loss is not obvious, but it can greatly speed up the response time, especially the grayscale response time.

[0052] The display panels of the embodiments of the present disclosure can achieve a balance among response time, transmittance, and contrast, without significantly compromising one parameter at the expense of another. For example, a low response time can be achieved, transmittance can remain almost unchanged or even increase, and contrast can be slightly decreased or increased.

[0053] In some embodiments, the contrast ratio of the display panel is 2200:1 or higher. In some embodiments, the contrast ratio of the display panel is 2500:1 or higher. In some embodiments, the contrast ratio of the display panel is 2600:1 or higher. For example, the contrast ratio of the display panel can be 2267, 2384, 2500, or 2600.

[0054] In some embodiments, the response time of the display panel from the brightest brightness to the darkest brightness is no more than 9 ms. For example, the response time of the display panel from the brightest brightness to the darkest brightness is 7.42 ms, 7.53 ms, 7.58 ms, 7.68 ms, or 7.72 ms.

[0055] In some embodiments, the response time of the display panel from the darkest brightness to the brightest brightness is no more than 9.5 ms. For example, the response time of the display panel from the darkest brightness to the brightest brightness is 9.0 ms, 8.44 ms, 8.41 ms, 8.23 ​​ms, or 7.86 ms.

[0056] In some embodiments, the saturation voltage of the liquid crystal layer is greater than 7.0 V. For example, the saturation voltage of the liquid crystal layer is 8.9 V, 9.1 V, 9.6 V, 9.8 V, or 10.1 V.

[0057] The present invention will be better described below with reference to specific embodiments.

[0058] Example 1

[0059] Table 1

[0060] Table 1 shows a comparison between the liquid crystal-related characteristics of the display panel of Comparative Example 1 and the liquid crystal-related characteristics of the display panel of Example 1.

[0061] In Comparative Example 1, the saturation voltage of the liquid crystal (V op ) is slightly less than the maximum operating voltage (V IC max ), the saturation voltage of the liquid crystal of comparative example 1 (V op ) is 8.1V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is 8.2V. The rotational viscosity γ1 of the liquid crystal is 109.6 (mPa·s), the refractive index of the liquid crystal is 0.0837, the saturation voltage of the liquid crystal is 8.1V, and the cell gap (CG, which can be understood as the distance between the two opposite alignment films of the display panel) is 2.8μm. The display panel in Comparative Example 1 is at the maximum operating voltage (V IC max ) is 100%, the contrast ratio of the display panel is 2500:1, and the response time T of the display panel from the darkest brightness to the brightest brightness is r The response time of the display panel from the brightest brightness to the darkest brightness is 9.86ms. f It is 9.98ms.

[0062] For Example 1, the saturation voltage of the liquid crystal layer (V op ) is designed to be greater than the maximum operating voltage (V IC max Specifically, in Example 1, the saturation voltage of the liquid crystal layer (V op ) is designed to be 9.6V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is still 8.2V. It should be noted that although the saturation voltage of the liquid crystal layer (V op ) is designed to be 9.6V, but during the operation of the display panel, due to the maximum operating voltage (V IC max) is limited to 8.2V. In actual operation, the upper limit of the voltage applied to the liquid crystal layer is also the maximum operating voltage of 8.2V (V IC max ), so it will not cause "overvoltage" damage. In addition, although the voltage applied to the liquid crystal layer in actual operation cannot reach its saturation voltage (V op ) and can only reach a lower maximum operating voltage (V IC max ), but since the end of the VT curve of liquid crystal (especially negative liquid crystal) is relatively flat, this has little effect on the transmittance.

[0063] In Example 1, the rotational viscosity γ1 of the liquid crystal is 83.5 (mPa·s), the refractive index of the liquid crystal is 0.0845, the saturation voltage of the liquid crystal is 9.6V, the cell thickness CG is 2.8μm, and the contrast ratio of the display panel is 2500:1. In this embodiment, the low-viscosity monomer liquid crystal component can be increased to reduce the liquid crystal viscosity. If the voltage applied to the liquid crystal can be taken to the saturation voltage V op , the response time T of the display panel from the darkest brightness to the brightest brightness r The response time of the display panel from the brightest brightness to the darkest brightness is 9.30ms. f However, in actual operation, the V IC max Driving limitation: the voltage applied to the liquid crystal cannot reach the saturation voltage V op But it can only reach a maximum of V IC max , the response time T of the display panel of Example 1 from the darkest brightness to the brightest brightness r The response time of the display panel from the brightest brightness to the darkest brightness is 8.44ms. f It is 7.53ms.

[0064] It can be seen from Table 1 that the response time T from the darkest brightness to the brightest brightness of Comparative Example 1 is r Compared with 9.86V, the response time T of the display panel of Example 1 from the darkest brightness to the brightest brightness is r Compared with the response time T from the brightest brightness to the darkest brightness of Comparative Example 1, the response time T f Compared with 9.98ms, the response time T of the display panel of Example 1 from the brightest brightness to the darkest brightness is f The response time is significantly reduced to 7.53 ms, which is a significant decrease of 25%. Therefore, Example 1 can significantly reduce the response time and improve the response speed.

[0065] Meanwhile, the light transmittance of Example 1 is only slightly reduced compared to that of Comparative Example 1. Specifically, the light transmittance of Example 1 is only reduced by 0.8% compared to that of the Comparative Example.

[0066] Furthermore, Example 1 can also maintain a high contrast ratio of 2500:1.

[0067] Example 2

[0068] Table 2

[0069] Table 2 shows a comparison between the liquid crystal-related characteristics of the display panel of Comparative Example 2 and the liquid crystal-related characteristics of the display panel of Example 2.

[0070] In Comparative Example 2, the saturation voltage of the liquid crystal (V op ) is less than the maximum operating voltage (V IC max ), the saturation voltage of the liquid crystal of comparative example 2 (V op ) is 7.8V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is 8.2 V. The rotational viscosity γ1 of the liquid crystal is 133 (mPa·s), the refractive index of the liquid crystal is 0.0844, and the liquid crystal cell thickness CG is 2.8 μm. The display panel in Comparative Example 2 is at the maximum operating voltage (V IC max ) is 100%, the contrast ratio of the display panel is 2500:1, and the response time T of the display panel from the darkest brightness to the brightest brightness is r The response time of the display panel from the brightest brightness to the darkest brightness is 9.86ms. f It is 9.98ms.

[0071] For Example 2, the saturation voltage of the liquid crystal layer (V op ) is designed to be greater than the maximum operating voltage (V IC max Specifically, in Example 2, the saturation voltage of the liquid crystal layer (V op ) is designed to be 10.1V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is 8.2 V. It should be noted that although the saturation voltage of the liquid crystal layer (V op ) is designed to be 10.1V, but during the operation of the display panel, due to the maximum operating voltage (V IC max ) is limited to 8.2V. In actual operation, the upper limit of the voltage applied to the liquid crystal layer is also the maximum operating voltage of 8.2V (V IC max ), so it will not cause "overvoltage" damage. In addition, although the voltage applied to the liquid crystal layer in actual operation cannot reach its saturation voltage (V op ) and can only reach a lower maximum operating voltage (V IC max), but since the end of the VT curve of liquid crystal (especially negative liquid crystal) is relatively flat, this has little effect on the transmittance.

[0072] In Example 2, the rotational viscosity γ1 of the liquid crystal is 108 (mPa·s), the refractive index of the liquid crystal is 0.0903, the cell thickness CG is 2.8 μm, and the contrast ratio of the display panel is 2500:1. In this example, the refractive index of the liquid crystal is relatively large to better transmit light. If the maximum voltage applied to the liquid crystal can be taken to the saturation voltage V op , then the response time of the display panel from the darkest brightness to the brightest brightness is T r The response time of the display panel from the brightest brightness to the darkest brightness is 9.10ms. f However, in actual operation, the V IC max Driving limitation: the voltage applied to the liquid crystal cannot reach the saturation voltage V op But it can only reach a maximum of V IC max , the response time T from the darkest brightness to the brightest brightness of the display panel of Example 2 r The response time of the display panel from the brightest brightness to the darkest brightness is 8.23ms. f It is 7.42ms.

[0073] It can be seen from Table 2 that the response time T from the darkest brightness to the brightest brightness of Comparative Example 2 is r Compared with 9.86V, the response time T of the display panel of Example 2 from the darkest brightness to the brightest brightness is r Compared with the response time T from the brightest brightness to the darkest brightness of Comparative Example 2, the response time T f Compared with 9.98ms, the response time T of the display panel of Example 2 from the brightest brightness to the darkest brightness is f The response time is significantly reduced to 7.42 ms, that is, a significant decrease of 26%. Therefore, Example 2 can significantly reduce the response time and improve the response speed.

[0074] For Example 2, the maximum voltage applied to the liquid crystal is the saturation voltage V op When the light transmittance of the liquid crystal can reach 107%. IC max Driving limitation: the voltage applied to the liquid crystal cannot reach the saturation voltage V op But it can only reach a maximum of V IC max The light transmittance of Example 2 does not reach 107%, but the light transmittance can still be as high as 104.2%. Compared with the light transmittance of Comparative Example 2, the light transmittance of the display panel of Example 2 is significantly increased from 100% to 104.2%.

[0075] In addition, the display panel of Example 2 can also maintain a high contrast ratio of 2500:1.

[0076] Example 3

[0077] Table 3

[0078] Table 3 shows a comparison between the liquid crystal-related characteristics of the display panel of Comparative Example 2 and the liquid crystal-related characteristics of the display panel of Example 3.

[0079] In Comparative Example 2, the saturation voltage of the liquid crystal (V op ) is less than the maximum operating voltage (V IC max ), the saturation voltage of the liquid crystal of comparative example 2 (V op ) is 7.8V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is 8.2 V. The rotational viscosity γ1 of the liquid crystal is 133 (mPa·s), the refractive index of the liquid crystal is 0.0844, and the liquid crystal cell thickness CG is 2.8 μm. The display panel in Comparative Example 2 is at the maximum operating voltage (V IC max ) is 100%, the contrast ratio of the display panel is 2500:1, and the response time T of the display panel from the darkest brightness to the brightest brightness is r The response time of the display panel from the brightest brightness to the darkest brightness is 9.86ms. f It is 9.98ms.

[0080] For Example 3, the saturation voltage of the liquid crystal layer (V op ) is designed to be greater than the maximum operating voltage (V IC max Specifically, in Example 3, the saturation voltage of the liquid crystal layer (V op ) is designed to be 8.9V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is 8.2 V. It should be noted that although the saturation voltage of the liquid crystal layer (V op ) is designed to be 8.9V, but during the operation of the display panel, due to the maximum operating voltage (V IC max ) is limited to 8.2V. In actual operation, the upper limit of the voltage applied to the liquid crystal layer is also the maximum operating voltage of 8.2V (V IC max ), so it will not cause "overvoltage" damage. In addition, although the voltage applied to the liquid crystal layer in actual operation cannot reach its saturation voltage (V op ) and can only reach a lower maximum operating voltage (V IC max), but since the end of the VT curve of liquid crystal (especially negative liquid crystal) is relatively flat, this has little effect on the transmittance.

[0081] In Example 3, the rotational viscosity γ1 of the liquid crystal is 99.1 (mPa·s), the refractive index of the liquid crystal is 0.0901, the cell thickness CG is 3.0 μm, and the contrast ratio of the display panel is 2600:1. In this example, the refractive index and cell thickness of the liquid crystal are adjusted to obtain a better transmittance. If the maximum voltage applied to the liquid crystal can be taken to the saturation voltage V op , then the response time of the display panel from the darkest brightness to the brightest brightness is T r The response time of the display panel from the brightest brightness to the darkest brightness is 8.31ms. f However, in actual operation, the V IC max Driving limitation: the voltage applied to the liquid crystal cannot reach the saturation voltage V op But it can only reach a maximum of V IC max , the response time T from the darkest brightness to the brightest brightness of the display panel of Example 3 r The response time of the display panel from the brightest brightness to the darkest brightness is 7.86ms. f It is 7.53ms.

[0082] It can be seen from Table 3 that the response time T from the darkest brightness to the brightest brightness of Comparative Example 2 is r Compared with 9.86V, the response time T of the display panel of Example 3 from the darkest brightness to the brightest brightness is r Compared with the response time T from the brightest brightness to the darkest brightness of the comparative example 2, f Compared with 9.98ms, the response time T of the display panel of Example 3 from the brightest brightness to the darkest brightness is f The response time is significantly reduced to 7.53 ms. Therefore, Example 3 can significantly reduce the response time and improve the response speed.

[0083] For Example 3, the maximum voltage applied to the liquid crystal is the saturation voltage V op When the light transmittance of the liquid crystal can reach 117.10%. In actual work, the light transmittance of the liquid crystal can reach 117.10%. IC max Driving limitation: the voltage applied to the liquid crystal cannot reach the saturation voltage V op But it can only reach a maximum of V IC max The light transmittance of Example 2 does not reach 117.10%, but the light transmittance can still be as high as 115.04%. Compared with the light transmittance of Comparative Example 2, the light transmittance of the display panel of Example 2 is significantly increased from 100% to 115.04%.

[0084] In addition, the display panel of Example 3 can also maintain a high contrast ratio of 2600:1.

[0085] Example 4

[0086] Table 4

[0087] Table 4 shows a comparison between the liquid crystal-related characteristics of the display panel of Comparative Example 2 and the liquid crystal-related characteristics of the display panel of Example 4.

[0088] In Comparative Example 2, the saturation voltage of the liquid crystal (V op ) is less than the maximum operating voltage (V IC max ), the saturation voltage of the liquid crystal of comparative example 2 (V op ) is 7.8V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is 8.2 V. The rotational viscosity γ1 of the liquid crystal is 133 (mPa·s), the refractive index of the liquid crystal is 0.0844, and the liquid crystal cell thickness CG is 2.8 μm. The display panel in Comparative Example 2 is at the maximum operating voltage (V IC max ) is 100%, the contrast ratio of the display panel is 2500:1, and the response time T of the display panel from the darkest brightness to the brightest brightness is r The response time of the display panel from the brightest brightness to the darkest brightness is 9.86ms. f It is 9.98ms.

[0089] For Example 4, the saturation voltage of the liquid crystal layer (V op ) is designed to be greater than the maximum operating voltage (V IC max Specifically, in Example 4, the saturation voltage of the liquid crystal layer (V op ) is designed to be 9.8V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is 8.2 V. It should be noted that although the saturation voltage of the liquid crystal layer (V op ) is designed to be 9.8V, but during the operation of the display panel, due to the maximum operating voltage (V IC max ) is limited to 8.2V. In actual operation, the upper limit of the voltage applied to the liquid crystal layer is also the maximum operating voltage of 8.2V (V IC max ), so it will not cause "overvoltage" damage. In addition, although the voltage applied to the liquid crystal layer in actual operation cannot reach its saturation voltage (V op ) and can only reach a lower maximum operating voltage (V IC max), but since the end of the VT curve of liquid crystal (especially negative liquid crystal) is relatively flat, this has little effect on the transmittance.

[0090] In Example 4, the rotational viscosity γ1 of the liquid crystal is 126 (mPa·s), the refractive index of the liquid crystal is 0.101, the cell thickness CG is 2.8 μm, and the contrast ratio of the display panel is 2600:1. If the maximum voltage applied to the liquid crystal can be taken to the saturation voltage V op , then the response time of the display panel from the darkest brightness to the brightest brightness is T r The response time of the display panel from the brightest brightness to the darkest brightness is 9.41ms. f However, in actual operation, the V IC max Driving limitation: the voltage applied to the liquid crystal cannot reach the saturation voltage V op But it can only reach a maximum of V IC max , the response time T from the darkest brightness to the brightest brightness of the display panel of Example 3 r The response time of the display panel from the brightest brightness to the darkest brightness is 9.0ms. f It is 7.58ms.

[0091] It can be seen from Table 4 that the response time T from the darkest brightness to the brightest brightness of Comparative Example 2 is r Compared with 9.86V, the response time T of the display panel of Example 4 from the darkest brightness to the brightest brightness is r Compared with the response time T from the brightest brightness to the darkest brightness of Comparative Example 2, the response time T f Compared with 9.98ms, the response time T of the display panel of Example 3 from the brightest brightness to the darkest brightness is f The response time is significantly reduced to 7.58 ms. Therefore, Example 4 can significantly reduce the response time and improve the response speed.

[0092] For Example 4, the maximum voltage applied to the liquid crystal is the saturation voltage V op When the light transmittance of the liquid crystal reaches 120.4%. IC max Driving limitation: the voltage applied to the liquid crystal cannot reach the saturation voltage V op But it can only reach a maximum of V IC max The light transmittance of Example 2 does not reach 120.4%, but the light transmittance can still be as high as 115.8%. Compared with the light transmittance of Comparative Example 2, the light transmittance of the display panel of Example 4 is significantly increased from 100% to 115.8%.

[0093] In addition, the display panel of Example 4 can also maintain a high contrast ratio of 2600:1.

[0094] Example 5

[0095] Table 5

[0096] Table 5 shows a comparison between the liquid crystal-related characteristics of the display panel of Comparative Example 1 and the liquid crystal-related characteristics of the display panel of Example 5.

[0097] In Comparative Example 1, the saturation voltage of the liquid crystal (V op ) is slightly less than the maximum operating voltage (V IC max ), the saturation voltage of the liquid crystal of comparative example 1 (V op ) is 8.1V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is 8.2V. The rotational viscosity γ1 of the liquid crystal is 109.6 (mPa·s), the refractive index of the liquid crystal is 0.0837, the saturation voltage of the liquid crystal is 8.1V, and the cell gap (CG, which can be understood as the distance between the two opposite alignment films of the display panel) is 2.8μm. The display panel in Comparative Example 1 is at the maximum operating voltage (V IC max ) is 100%, the contrast ratio of the display panel is 2500:1, and the response time T of the display panel from the darkest brightness to the brightest brightness is r The response time of the display panel from the brightest brightness to the darkest brightness is 9.86ms. f It is 9.98ms.

[0098] For Example 5, the saturation voltage of the liquid crystal layer (V op ) is designed to be greater than the maximum operating voltage (V IC max Specifically, in Example 5, the saturation voltage of the liquid crystal layer (V op ) is designed to be 9.1V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is still 8.2V. It should be noted that although the saturation voltage of the liquid crystal layer (V op ) is designed to be 9.1V, but during the operation of the display panel, due to the maximum operating voltage (V IC max ) is limited to 8.2V. In actual operation, the upper limit of the voltage applied to the liquid crystal layer is also the maximum operating voltage of 8.2V (V IC max ), so it will not cause "overvoltage" damage. In addition, although the voltage applied to the liquid crystal layer in actual operation cannot reach its saturation voltage (V op ) and can only reach a lower maximum operating voltage (V ICmax ), but since the end of the VT curve of liquid crystal (especially negative liquid crystal) is relatively flat, this has little effect on the transmittance.

[0099] In Example 5, the rotational viscosity γ1 of the liquid crystal is 82.5 (mPa·s), the refractive index of the liquid crystal is 0.0875, the saturation voltage of the liquid crystal is 9.1V, the cell thickness CG is 2.8μm, and the contrast ratio of the display panel is 2384:1. If the voltage applied to the liquid crystal can be taken to the saturation voltage V op , the response time T of the display panel from the darkest brightness to the brightest brightness r The response time of the display panel from the brightest brightness to the darkest brightness is 8.92ms. f However, in actual operation, the V IC max Driving limitation: the voltage applied to the liquid crystal cannot reach the saturation voltage V op But it can only reach a maximum of V IC max , the response time T from the darkest brightness to the brightest brightness of the display panel of Example 5 r The response time of the display panel from the brightest brightness to the darkest brightness is 8.23ms. f It is 7.68ms.

[0100] It can be seen from Table 5 that the response time T from the darkest brightness to the brightest brightness of Comparative Example 1 is r Compared with 9.86V, the response time T of the display panel of Example 5 from the darkest brightness to the brightest brightness is r Compared with the response time T from the brightest brightness to the darkest brightness of Comparative Example 1, the response time T f Compared with 9.98ms, the response time T of the display panel of Example 1 from the brightest brightness to the darkest brightness is f The response time is significantly reduced to 7.68 ms. Therefore, Example 5 can significantly reduce the response time and improve the response speed.

[0101] At the same time, the light transmittance of Example 5 is also significantly improved compared with that of Comparative Example 1. Specifically, the light transmittance of Example 5 is increased by 5.2% compared with that of Comparative Example 1.

[0102] Furthermore, although the contrast ratio of Example 5 is slightly reduced, the response time is greatly improved, and the transmittance is also greatly increased.

[0103] Example 6

[0104] Table 6

[0105] Table 6 shows a comparison between the liquid crystal-related characteristics of the display panel of Comparative Example 1 and the liquid crystal-related characteristics of the display panel of Example 6.

[0106] In Comparative Example 1, the saturation voltage of the liquid crystal (V op ) is slightly less than the maximum operating voltage (V IC max ), the saturation voltage of the liquid crystal of comparative example 1 (V op ) is 8.1V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is 8.2V. The rotational viscosity γ1 of the liquid crystal is 109.6 (mPa·s), the refractive index of the liquid crystal is 0.0837, the saturation voltage of the liquid crystal is 8.1V, and the cell gap (CG, which can be understood as the distance between the two opposite alignment films of the display panel) is 2.8μm. The display panel in Comparative Example 1 is at the maximum operating voltage (V IC max ) is 100%, the contrast ratio of the display panel is 2500:1, and the response time T of the display panel from the darkest brightness to the brightest brightness is r The response time of the display panel from the brightest brightness to the darkest brightness is 9.86ms. f It is 9.98ms.

[0107] For Example 6, the saturation voltage of the liquid crystal layer (V op ) is designed to be greater than the maximum operating voltage (V IC max Specifically, in Example 5, the saturation voltage of the liquid crystal layer (V op ) is designed to be 9.6V, and the maximum operating voltage between the first electrode and the second electrode (V IC max ) is still 8.2V. It should be noted that although the saturation voltage of the liquid crystal layer (V op ) is designed to be 9.6V, but during the operation of the display panel, due to the maximum operating voltage (V IC max ) is limited to 8.2V. In actual operation, the upper limit of the voltage applied to the liquid crystal layer is also the maximum operating voltage of 8.2V (V IC max ), so it will not cause "overvoltage" damage. In addition, although the voltage applied to the liquid crystal layer in actual operation cannot reach its saturation voltage (V op ) and can only reach a lower maximum operating voltage (V IC max ), but since the end of the VT curve of liquid crystal (especially negative liquid crystal) is relatively flat, this has little effect on the transmittance.

[0108] In Example 6, the rotational viscosity γ1 of the liquid crystal is 70 (mPa·s), the refractive index of the liquid crystal is 0.0868, the saturation voltage of the liquid crystal is 9.6V, and the contrast ratio of the display panel is 2267.8:1. The liquid crystal cell thickness CG is set to 3.0μm to increase the transmittance. If the voltage applied to the liquid crystal can be taken to the saturation voltage V op , the response time T of the display panel from the darkest brightness to the brightest brightness r The response time of the display panel from the brightest brightness to the darkest brightness is 9.31ms. f However, in actual operation, the V IC max Driving limitation: the voltage applied to the liquid crystal cannot reach the saturation voltage V op But it can only reach a maximum of V IC max , the response time T from the darkest brightness to the brightest brightness of the display panel of Example 6 r The response time of the display panel from the brightest brightness to the darkest brightness is 8.41ms. f It is 7.72ms.

[0109] It can be seen from Table 6 that the response time T from the darkest brightness to the brightest brightness of Comparative Example 1 is r Compared with 9.86V, the response time T of the display panel of Example 6 from the darkest brightness to the brightest brightness is r Compared with the response time T from the brightest brightness to the darkest brightness of the comparative example 1, the response time T f Compared with 9.98ms, the response time T of the display panel of Example 1 from the brightest brightness to the darkest brightness is f The response time is significantly shortened to 7.72ms. Therefore, Example 6 can significantly reduce the response time and improve the response speed.

[0110] At the same time, the light transmittance of Example 6 is also significantly improved compared with that of Comparative Example 1. Specifically, the light transmittance of Example 6 is increased by 11.8% compared with that of Comparative Example 1.

[0111] Furthermore, although the contrast ratio of Example 6 is slightly reduced, the response time is greatly improved, and the transmittance is also greatly increased.

[0112] The display panel includes at least one of the following: ADS (Advanced Super Dimension Switch) type display panel, FFS (Fring Field Switching) type display panel, TN (Twisted Nematic) type display panel, IPS (In-Plane Switching) type display panel, VA (Vertical Alignment) type display panel, etc.

[0113] FIG4 is a schematic diagram of the VT curves of Comparative Example 1 and Example 1. As can be seen from the above description, in actual operation, the upper limit of the voltage applied to the liquid crystal layer is also the maximum operating voltage (V IC max ), so it will not cause "overvoltage" damage. As can be seen from Figure 4, although the voltage applied to the liquid crystal layer in actual operation cannot reach its saturation voltage (V op ) and can only reach a lower maximum operating voltage (V IC max ), but because the end of the VT curve of liquid crystal (especially negative liquid crystal) is relatively flat, this has little effect on the transmittance, but it can greatly speed up the response time of the display panel and achieve a balance between transmittance and response time.

[0114] FIG5 is a schematic diagram showing the comparison of the VT curves of Comparative Example 2 and Example 2. As can be seen from FIG5 , compared with Comparative Example 2, the response time T f It is significantly shorter and also achieves an improvement in light transmittance (increased by 4%).

[0115] Figure 6 is a schematic diagram comparing the VT curves of Example 2 and Example 3. Combining the previous table with Figure 6, the transmittance of Example 3 can be further improved from 104.2% of Example 2 to 115.4%, and it also has an excellent response time T f .

[0116] Figure 7 is a schematic diagram comparing the VT curves of Example 2 and Example 4. Combining the previous table with Figure 7, the transmittance of Example 4 can be further improved from 104.2% of Example 2 to 115.8%, and the contrast ratio is increased from 2500:1 of Example 2 to 2600:1. At the same time, it also has an excellent response time T f .

[0117] Figure 8 is a schematic diagram comparing the VT curves of Comparative Example 1 and Example 5. Compared with Comparative Example 1, the response time T f Significantly shortened, greatly improving response speed.

[0118] Figure 9 is a schematic diagram comparing the VT curves of Comparative Example 1 and Example 6. Compared with Comparative Example 1, the transmittance of Example 6 is significantly improved, and the response time T f Significantly shortened, greatly improving response speed.

[0119] FIG10 is a schematic diagram of a display device according to an embodiment of the present disclosure. As shown in FIG10 , a display device 100 according to an embodiment of the present disclosure may include a display panel 200 , which may be the display panel shown in FIG1 .

[0120] While certain specific embodiments have been described, these embodiments have been presented by way of example only and are not intended to limit the scope of the invention. Indeed, the novel embodiments described herein may be embodied in a variety of other forms; furthermore, various omissions, substitutions, and changes in the form of the embodiments described herein may be made without departing from the spirit of the invention. The appended claims and their equivalents are intended to cover such forms or modifications as fall within the scope and spirit of the invention.

Claims

1. A display panel, comprising: Substrate; A first electrode on the substrate; A liquid crystal layer on a surface of the first electrode remote from the substrate; A second electrode on a surface of the liquid crystal layer remote from the substrate, wherein A saturation voltage of the liquid crystal layer is greater than a maximum operating voltage difference between the first electrode and the second electrode.

2. The display panel according to claim 1, wherein, A difference between the saturation voltage of the liquid crystal layer and the maximum operating voltage difference between the first electrode and the second electrode ranges from 0.35 V to 5.20 V.

3. The display panel according to claim 2, wherein, A difference between the saturation voltage of the liquid crystal layer and the maximum operating voltage difference between the first electrode and the second electrode ranges from 0.50 V to 4.00 V.

4. The display panel according to claim 3, wherein, A contrast ratio of the display panel is 2200:1 or higher.

5. The display panel according to claim 4, wherein, A contrast ratio of the display panel is 2500:1 or higher.

6. The display panel according to claim 4, wherein, A contrast ratio of the display panel is 2600:1 or higher.

7. The display panel according to claim 3, wherein, A response time of the display panel from a brightest luminance to a darkest luminance is not more than 9 ms.

8. The display panel according to claim 7, wherein, The response time of the display panel from the brightest luminance to the darkest luminance is 7.42 ms, 7.53 ms, 7.58 ms, 7.68 ms or 7.72 ms.

9. The display panel according to claim 3, wherein, A response time of the display panel from a darkest luminance to a brightest luminance is not more than 9.5 ms.

10. The display panel according to claim 9, wherein, The response time of the display panel from the darkest luminance to the brightest luminance is 9.0 ms, 8.44 ms, 8.41 ms, 8.23 ms or 7.86 ms.

11. The display panel according to claim 1, wherein, The saturation voltage of the liquid crystal layer is 7.0 V or higher. Optionally, the saturation voltage of the liquid crystal layer is: 8.9 V, 9.1 V, 9.6 V, 9.8 V or 10.1 V.

12. The display panel according to any one of claims 1-11, wherein, The liquid crystal includes negative liquid crystal.

13. The display panel according to claim 1, wherein, A refractive index of the liquid crystal layer is 0.072 or higher. Optionally, the refractive index of the liquid crystal layer is one of the following: 0.0845, 0.0903, 0.0901, 0.101, 0.875 or 0.

868.

14. The display panel according to claim 1, wherein, A rotational viscosity of the liquid crystal layer ranges from 60 mPa·s to 145 mPa·s. Optionally, the rotational viscosity of the liquid crystal layer is one of the following: 70 mPa·s, 82.5 mPa·s, 83.5 mPa·s, 99.1 mPa·s, 108 mPa·s or 126 mPa·s.

15. The display panel according to any one of claims 1-14, wherein, The display panel includes at least one of the following: an ADS type display panel, an FFS type display panel, a TN type display panel, an IPS type display panel, a VA type display panel.

16. The display panel according to any one of claims 1-14, wherein, The maximum operating voltage difference between the first electrode and the second electrode ranges from 5.8 V to 10.7 V.

17. A display device, comprising the display panel according to any one of claims 1-16.

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