TWI708106B - Liquid crystal display panel - Google Patents

Abstract

A liquid crystal display panel includes a first substrate having a light inputting plane and an opposite light outputting plane, a color filter layer, a second substrate, a pixel array, a planarization layer, a pixel electrode, and a liquid crystal composition. The color filter layer is disposed on the light outputting plane of the first substrate. The second substrate is disposed to the opposite of the first substrate. The pixel array is disposed on the second substrate and between the color filter layer and the second substrate. The planarization layer is disposed on the pixel array. The pixel electrode is disposed on the planarization layer. The liquid crystal composition is disposed between the color filer layer and the pixel electrode. The liquid crystal composition has the following property. K ₁₁/K ₃₃≤0.845. K ₁₁is the splay elastic constant of the liquid crystal composition. K ₃₃is the bend elastic constant of the liquid crystal composition.

Description

LCD panel

The present invention relates to a display panel, and particularly relates to a liquid crystal display panel.

In recent years, in order to provide users with a better visual experience, a four-sided full-plane design has become the mainstream of the development of liquid crystal displays. Therefore, improving the performance and display quality of the four-sided full-planar display panel has become one of the development focuses of various panel manufacturers. Different from the original design where the color light substrate side of the display panel faces people, the four-sided full-planar display panel will have the array substrate side facing people. This difference will make the image sticking (IS) performance of the LCD display worse.

Since the liquid crystal layer of the liquid crystal display panel is exposed to long-term light, the performance of image sticking will be further deteriorated. Generally speaking, the cause of image sticking comes from the residual electric charge in the liquid crystal layer, which partially offsets the original applied electric field in the state of voltage driving, so that the residual image is displayed on the liquid crystal display panel. Therefore, the rotation angle of the liquid crystal in the liquid crystal cell is not as expected, which affects the display effect of the display panel. In addition, for a full-planar design display, the white light emitted by the backlight module of the light-emitting diode will first receive the color resist on the side of the color light substrate and then enter the liquid crystal cell due to the design of the array substrate side facing people. , Causing the light source received by the liquid crystal cell to transform from the original color light substrate side toward the pure white light designed by people into red, green and blue color lights. The above-mentioned image sticking phenomenon has different degrees of performance under different colored light conditions. For example, the image retention performance under red light conditions is stronger than the image retention performance under blue light conditions. Therefore, how to reduce the image sticking phenomenon in the full-planar design, that is, when the array substrate side of the display panel faces people, so as to reduce the impact on the image quality performance of the liquid crystal display panel is one of the directions of the efforts of various panel manufacturers.

The present invention provides a liquid crystal display panel, which can improve the properties of the liquid crystal composition, increase the residual voltage release speed, and enhance the performance and display quality of the liquid crystal display panel.

The liquid crystal display panel of the present invention includes a first substrate having a light incident surface and an opposite light emitting surface, a color filter layer is disposed on the light emitting surface of the first substrate, and the second substrate is disposed on the opposite side of the first substrate, and a pixel array It is arranged on the second substrate and is located between the color filter layer and the second substrate, the flat layer is arranged on the pixel array, the pixel electrode layer is arranged on the flat layer, and the liquid crystal composition is arranged on the color filter layer and the pixels Between electrode layers. The liquid crystal composition has the following properties: K ₁₁ /K ₃₃ ≤0.845, where K _{11 is} the coefficient of expansion elasticity of the liquid crystal composition, and K _{33 is} the coefficient of flexural elasticity of the liquid crystal composition.

Based on the above, the liquid crystal display panel of an embodiment of the present invention can transmit the elastic coefficient of the liquid crystal composition to improve the properties of the liquid crystal composition, so that the ratio of the expansion elastic coefficient K ₁₁ to the bending elastic coefficient K ₃₃ of the liquid crystal composition satisfies K ₁₁ /K ₃₃ ≤0.845. In this way, the liquid crystal composition can be easily rotated under the same electric field effect, and the residual voltage release speed can be increased. Therefore, the influence of the image sticking phenomenon on the liquid crystal display panel can be reduced, and the performance and display quality of the liquid crystal display panel can be further improved.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings. As those skilled in the art would realize, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present invention.

In the drawings, the thickness of each element and the like are exaggerated for clarity. Throughout the specification, the same reference numerals denote the same elements. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being “on”, or “connected to,” or “overlapped with, another element,” it may be directly on another element. On or connected to another element, or intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements. As used herein, "connected" can refer to physical and/or electrical connections.

It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and/or parts, these elements, components, regions, and/or Or part should not be restricted by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Therefore, the “first element,” “component,” “region,” “layer,” or “portion” discussed below may be referred to as a second element, component, region, layer or portion without departing from the teachings herein.

The terminology used here is only for the purpose of describing specific embodiments and is not limiting. As used herein, unless the content clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms, including "at least one." "Or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the related listed items. It should also be understood that when used in this specification, the terms "including" and/or "including" designate the presence of the features, regions, wholes, steps, operations, elements, and/or components, but do not exclude one or more The existence or addition of other features, regions as a whole, steps, operations, elements, components, and/or combinations thereof.

In addition, relative terms such as "lower" or "bottom" and "upper" or "top" may be used herein to describe the relationship between one element and another element, as shown in the figure. It should be understood that relative terms are intended to include different orientations of the device other than those shown in the figures. For example, if the device in one figure is turned over, elements described as being on the "lower" side of other elements will be oriented on the "upper" side of the other elements. Therefore, the exemplary term "lower" may include an orientation of "lower" and "upper", depending on the specific orientation of the drawing. Similarly, if the device in one figure is turned over, elements described as "below" or "beneath" other elements will be oriented "above" the other elements. Thus, the exemplary terms "below" or "below" can include an orientation of above and below.

As used herein, "about", "substantially", "substantially", or "approximately" includes the stated value and the average value within the acceptable deviation range of the specific value determined by a person of ordinary skill in the art, taking into account all The measurement in question and the specific number of errors associated with the measurement (ie, the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of related technologies and the present invention, and will not be interpreted as idealized or excessive The formal meaning, unless explicitly defined as such in this article.

The exemplary embodiments are described herein with reference to cross-sectional views that are schematic diagrams of idealized embodiments. Therefore, a change in the shape of the diagram as a result of, for example, manufacturing technology and/or tolerance can be expected. Therefore, the embodiments described herein should not be interpreted as being limited to the specific shape of the area as shown herein, but include, for example, shape deviations caused by manufacturing. For example, areas shown or described as flat may generally have rough and/or non-linear characteristics. In addition, the acute angles shown may be rounded. Therefore, the regions shown in the figures are schematic in nature, and their shapes are not intended to show the precise shape of the regions, and are not intended to limit the scope of the claims.

FIG. 1 is a schematic cross-sectional view of a liquid crystal display panel according to an embodiment of the invention. FIG. 2 is a schematic cross-sectional view of a second substrate and a pixel array of the liquid crystal display panel of FIG. 1. For the convenience of description and observation, FIG. 2 only schematically shows some components. Hereinafter, the structure of the liquid crystal display panel 10 of this embodiment will be described with reference to FIGS. 1 and 2.

1, the liquid crystal display panel 10 includes a first substrate 100, a color filter layer 120, a second substrate 200, a pixel array 220, a flat layer 240, a pixel electrode 260, and a liquid crystal composition LC. The liquid crystal display panel 10 further includes a backlight module 300.

In detail, referring to FIG. 1, the first substrate 100 has a light incident surface 101 and a light output surface 102 opposite to the light incident surface 101. The color filter layer 120 is disposed on the light-emitting surface 102 of the first substrate 100. In other words, the first substrate 100 is used as a color filter substrate of the liquid crystal display panel 10. In this embodiment, the material of the first substrate 100 includes a light-transmitting material, such as glass, quartz, plastic, or other applicable materials, and the invention is not limited thereto.

The material of the color filter layer 120 is, for example, a transparent color resist material with color. In other words, the color filter layer 120 is suitable for changing the light beam passing through the color filter layer 120 from one wavelength range/or color to another wavelength range/or color. For example, the color filter layer 120 includes a first color light pattern 121, a second color light pattern 122, and a third color light pattern 123. The color of the first color light pattern 121 and the color of the second color light pattern 122 or the third color light pattern 123 may be the same or different. Specifically, the color of the first color light pattern 121 includes blue, red, green or white or other suitable colors. The color of the second colored light pattern 122 includes blue, red, green or white or other suitable colors. The color of the third color light pattern 123 includes blue, red, green or white or other suitable colors. In the following embodiments, the colors of the first color light pattern 121, the colors of the second color light pattern 122 and the third color light pattern 123 are all different for description. For example, the color of the first color light pattern 121 is blue, the color of the second color light pattern 122 is red, and the color of the third color light pattern 123 is green, but not limited to this.

In some embodiments, a light-shielding pattern layer, a reflective layer, or other film layers with optical characteristics may be selectively disposed between the first substrate 100 and the color filter layer 120, but the invention is not limited thereto.

Please refer to FIG. 1, the second substrate 200 is disposed opposite to the first substrate 100. The pixel array 220 is disposed on the second substrate 200. In this embodiment, the pixel array 220 is disposed on the surface of the second substrate 200 facing the first substrate 100. In other words, the pixel array 220 is located between the color filter layer 120 and the second substrate 200. In this embodiment, the second substrate 200 is used as a pixel array substrate of the liquid crystal display panel 10. The material of the second substrate 200 includes a light-transmitting material, such as glass, quartz, plastic, or other applicable materials, and the present invention is not limited thereto.

Please refer to FIGS. 1 and 2. The liquid crystal display panel 10 of FIG. 1 is a schematic cross-sectional view taken along the section line A-A' of FIG. 2. For convenience of description and observation, FIG. 2 only schematically illustrates some components. As shown in FIG. 2, the pixel array 220 includes a plurality of pixels PX arranged in an array arranged on the second substrate 200. For example, in this embodiment, each pixel PX includes an active element T. The above-mentioned active element T includes a thin film transistor (TFT). The thin film transistor includes a gate electrode, a channel layer, and a source electrode and a drain electrode (not shown) electrically connected to the channel layer. The thin film transistor can be a bottom gate-type thin film transistor (Bottom Gate-TFT), a top gate-type thin film transistor (Top Gate-TFT) or other suitable types of thin film transistors. In this embodiment, the thin film transistor is, for example, low temperature poly-Si (LTPS) or amorphous Si (a-Si), but the invention is not limited thereto.

Please refer to FIG. 2, in this embodiment, the pixel array 220 may further include a plurality of data lines DL and a plurality of scan lines SL, wherein the plurality of data lines DL and the plurality of scan lines SL are alternately arranged, and each active element T is electrically connected to a corresponding data line DL and a corresponding scan line SL. For example, the scan line SL may be electrically connected to the gate (not labeled) of the active device T. The data line DL can be electrically connected to the source of the active device T (not labeled). The drain (not labeled) of the active device T may also be electrically connected to the corresponding pixel electrode 260. It should be noted that the pixel array 220 depicted in FIG. 2 is only used to illustrate the present invention, but not to limit the present invention. In other embodiments, the pixel array 220 may also be in other suitable forms.

Please refer to FIG. 1 and FIG. 2. In this embodiment, the plurality of pixels PX includes, for example, a first pixel PX1, a second pixel PX2, and a third pixel PX3. The first pixel PX1 corresponds to the first color light pattern 121, for example. The second pixel PX2 corresponds to the second color light pattern 122, for example. The third pixel PX3 corresponds to the third color light pattern 123, for example. However, the present invention is not limited to this.

The flat layer 240 is disposed on the pixel array 220. In this embodiment, the planarization layer 240 includes an inorganic material or an organic material. The above-mentioned inorganic material includes silicon oxide, silicon nitride or a combination thereof, but the invention is not limited thereto.

A plurality of pixel electrodes 260 are disposed on the flat layer 240. Please refer to FIG. 1 and FIG. 2, a plurality of pixel electrodes 260 are arranged in an array on the flat layer 240. For example, each pixel electrode 260 is arranged corresponding to each pixel PX. From another perspective, each pixel PX not only includes an active device T, but also includes a pixel electrode 260 electrically connected to the active device T, but the invention is not limited to this.

In this embodiment, the liquid crystal display panel 10 further includes a common electrode layer 280 disposed between the pixel array 220 and the flat layer 240. The plurality of pixel electrodes 260 overlap the common electrode 280, respectively. In other words, the liquid crystal display panel 10 of this embodiment is a fringe field switching (Fringe Field Switching, FFS) mode liquid crystal display panel. In this embodiment, both the pixel electrode 260 and the common electrode layer 280 may optionally be transparent electrodes. The material of the above-mentioned light-transmitting electrode includes indium tin oxide (Indium Tin Oxide), indium zinc oxide (Indium Zinc Oxide), aluminum tin oxide (Aluminum Tin Oxide), aluminum zinc oxide (Aluminum Zinc Oxide), indium gallium zinc Oxide (Indium Gallium Zinc Oxide), other suitable oxides, or a stacked layer of at least two of the above, but the present invention is not limited thereto.

The liquid crystal display panel 10 further includes a first alignment film 190 disposed on the color filter layer 120 and a second alignment layer 290 disposed on the plurality of pixel electrodes 260. For example, the second alignment layer 290 covers a plurality of pixel electrodes 260 and contacts the flat layer 240, but is not limited to this. In this embodiment, the materials of the first alignment film 190 and the second alignment film 290 include polyimide (PI) or other suitable materials, but the present invention is not limited thereto.

In this embodiment, the backlight module 300 is disposed adjacent to the light incident surface 101 of the first substrate 100. The backlight module 300 provides a light beam WL. The backlight module 300 is, for example, a light emitting device, including a lamp tube or one or more light-emitting diodes (LED), but not limited to this. In this embodiment, the light beam WL provided by the backlight module 300 is white light, but it is not limited to this.

The light beam WL penetrates the first substrate 100 and the color filter layer 120 from the light incident surface 101 to form the first color light L1 and the second color light L2. For example, the light beam WL can respectively penetrate the first color light pattern 121, the second color light pattern 122 and/or the third color light pattern 123 of the color filter layer 120. In this way, the wavelength and/or color of the light beam WL can be changed by the color light patterns 121 and 122, respectively, to form the first color light L1 and the second color light L2 having different wavelengths and colors from the light beam WL. The wavelength and/or color of the light beam WL can be further changed by the third color light pattern 123 to form a third color light L3 having a different wavelength and/or color from the light beam WL. In other words, the first color light L1 passing through the first color light pattern 121 may be blue light, red light, green light or white light. The color lights L2, L3 that have passed through the second color light pattern 122 or the third color light pattern 123 may also be blue light, red light, green light or white light, but not limited to this. In this embodiment, the first color light L1 is blue light, the second color light L2 is red light, and the third color light L3 is green light, but it is not limited to this.

Please refer to FIG. 1, the liquid crystal display panel 10 includes a liquid crystal composition LC, wherein the liquid crystal composition LC is disposed between the color filter layer 120 and the pixel electrode 260. Specifically, the liquid crystal composition LC is located between the first alignment film 190 and the second alignment film 290. The liquid crystal composition LC provided in the liquid crystal display panel 10 has a thickness. The thickness of the liquid crystal composition LC is substantially equal to the distance between the first alignment film 190 and the second alignment film 290, that is, the cell gap of the liquid crystal display panel 10.

In this embodiment, the liquid crystal composition LC includes positive liquid crystal molecules. In some embodiments, the liquid crystal composition LC may also include negative liquid crystal molecules, and the invention is not limited thereto. When there is a voltage between any pixel electrode 260 and the common electrode layer 280, for example, when the common electrode layer 280 is grounded and any pixel electrode 260 is set to have a specific potential, any one of the pixels An electric field is formed between the element electrode 260 and the common electrode layer 280. In this way, the long axis of the molecules (not shown) in the liquid crystal composition LC will rotate and align with the plane parallel to the second substrate 200 following the direction of the electric field.

It should be noted here that the color filter layer 120 is located between the backlight module 300 and the liquid crystal composition LC. Therefore, the light beam WL provided by the backlight module 300 is first converted by the first color light pattern 121 and the second color light pattern 122 of the color filter layer 120 into color light of a different color from the light beam WL. In other words, the light beam WL will form the first color light L1 and the second color light L2 of different colors. The first color light L1 and the second color light L2 will then penetrate the liquid crystal composition LC to make the first pixel PX1 emit light of the first color (for example, blue light), and the second pixel PX2 emit light of the second color ( For example red light). Under the above configuration, the liquid crystal composition LC is irradiated by the first color light L1 and the second color light L2 of different colors. Therefore, the portion of the liquid crystal composition LC overlapping the first pixel PX1 and the portion overlapping the second pixel PX2 have different residual voltage release speeds. As a result, the performance of image retention will be inconsistent.

It is worth noting that in this embodiment, the liquid crystal composition LC also has K ₁₁ and K ₃₃ , where K ₁₁ is the Splay elastic constant of the liquid crystal composition LC, and K ₃₃ is the Splay elastic constant of the liquid crystal composition LC. Bend elastic constant. In the first embodiment, the ratio of the coefficient of expansion elasticity K ₁₁ to the coefficient of flexural elasticity K ₃₃ of the liquid crystal composition LCA satisfies K ₁₁ /K ₃₃ ≦0.845. Specifically, for the liquid crystal composition LCA of the first embodiment, the liquid crystal composition LC B of the first comparative example, and the liquid crystal composition LC C of the second comparative example, the expansion elastic coefficient K ₁₁ and the flexural elastic coefficient K ₃₃ , please refer to the following Table I. LC A LC B LC C K ₁₁ (pN) 12 13.6 14.7 K ₃₃ (pN) 14.2 13.2 13.9 K ₁₁ /K ₃₃ 0.845 1.030 1.058 ∆T _L64 /∆V _L64 (%/V) 10.13 8.86 8.25 ∆(V _L2 -V _L1) (Voltage) 0.121 0.145 0.167 [Table I]

3 is a graph of voltage versus transmittance of the liquid crystal compositions LC A, LC B, and LC C of the first embodiment, the first comparative example, and the second comparative example of the present invention. 3, the curve VTA represents the voltage versus transmittance curve of the liquid crystal composition LC A of the first embodiment, and the curve VTB represents the voltage versus transmittance curve of the liquid crystal composition LC B of the first comparative example. VTC represents the voltage versus transmittance curve of the liquid crystal composition LC C of the second embodiment.

The curves VTA, VTB, and VTC in Figure 3 are measured in the following way. First, the liquid crystal compositions LC A, LC B, and LC C are respectively set in their respective first liquid crystal test cells. Each first liquid crystal test cell (not shown) includes a lower light-transmitting substrate, a lower alignment film covering the lower light-transmitting substrate on an entire surface, an upper light-transmitting substrate arranged on the opposite side of the lower light-transmitting substrate, and a covering on the entire surface The upper transparent electrode on the inner surface of the transparent substrate, the insulating layer covering the upper transparent electrode, the lower transparent electrode disposed on the insulating layer, the upper alignment film covering the lower transparent electrode, the upper alignment film and the lower alignment The liquid crystal composition LCA, LC B or LC C between the films, the lower polarizing film disposed on the outer surface of the lower transparent substrate, and the upper polarizing film disposed on the outer surface of the upper transparent substrate, wherein the alignment of the upper alignment film The direction is perpendicular to the alignment direction of the lower alignment film. The transmission axis of the upper polarizing film and the transmission axis of the lower polarizing film can be substantially parallel to the alignment direction of the upper alignment film and the alignment direction of the lower alignment film, and the first liquid crystal The cell gap of the test box is 3.0 μm. Next, a liquid crystal test box with each liquid crystal composition LC A, LC B, and LC C is set on the backlight module. The backlight module is, for example, a light emitting diode type backlight module, but the invention is not limited to this. Then, ground one of the upper transparent electrode and the lower transparent electrode of the first liquid crystal test box, and apply a test voltage signal to the other of the upper transparent electrode and the lower transparent electrode, and the frequency of the test voltage signal is 60 Hz , The amplitude of the test voltage signal is gradually adjusted from 0V to 7V in sequence; while the amplitude of the test voltage signal is gradually adjusted from 0V to 7V in sequence, the first measurement is measured by a luminance meter (for example: color analyzer CA-310) The brightness of the LCD test box under the amplitude of each test voltage signal (Luminance). Then, the brightness measured by the first liquid crystal test box at each amplitude of the test voltage signal is divided by the maximum brightness measured by the first liquid crystal test box within the amplitude range of the test voltage signal, then The transmittance of the first liquid crystal test cell under the amplitude of each test voltage can be obtained, and then the voltage versus transmittance curves VTA, VTB, VTC shown in FIG. 3 can be completed. It should be noted here that, in order to clearly show that the 64 gray scale L64 corresponds to the first voltage V1 between the pixel electrode 260 and the common electrode layer 280, FIG. 3 only partially shows the voltage in the interval of 1.5V to 2.5V across. Transmittance curves VTA, VTB, VTC.

Please refer to FIG. 3 and Table 1 above. In the embodiment of the present invention, the expansion elastic coefficient K ₁₁ of the liquid crystal composition LCA of the first embodiment is smaller than the expansion elastic coefficients of the liquid crystal compositions LC B and LC C of the comparative example. K ₁₁ . Bending elasticity coefficient of the liquid crystal composition LC A is greater than Comparative Example K ₃₃ of the liquid crystal composition LC B, coefficient of bending elasticity of LC C K _33. Therefore, the ratio K ₁₁ /K _{33 of the} coefficient of expansion elasticity K ₁₁ to the coefficient of flexural elasticity K ₃₃ of the liquid crystal composition LCA of the first embodiment can be greater than the coefficient of expansion elasticity K ₁₁ of the liquid crystal compositions LC B and LCC of the comparative example. K ₃₃ and the bending elastic constant ratio K ₁₁ / K _33.

Elastic expansion coefficient of the liquid crystal composition LC A of example, in the embodiment of the present invention, the first embodiment K ₁₁ K ₃₃ of the bending elastic constant ratio K ₁₁ / K ₃₃ ≤0.845. Thus, compared with the voltage versus transmittance curves VTB and VTC of the liquid crystal composition LC B and LC C of the comparative example, the voltage versus transmittance curve of the liquid crystal composition LC A of the first embodiment of the present invention VTA has a steep line shape in the range of 1.5V to 2.2V under 64 gray scale L64.

，其中∆V _L64為涵蓋第一電壓V1之第一電壓範圍中的最大電壓與最小電壓的差值，而∆T _L64為液晶組成物於第一電壓範圍中的最大穿透率與最小穿透率的差值。舉例而言，∆T _L64A為第一實施例的液晶組成物LC A於第一電壓範圍中的最大穿透率與最小穿透率的差值。∆T _L64B為第一比較例的液晶組成物LC B於第一電壓範圍中的最大穿透率與最小穿透率的差值。∆T _L64C為第二實施例的液晶組成物LC C於第一電壓範圍中的最大穿透率與最小穿透率的差值。第一電壓範圍例如是1.8V至1.9V。 Please refer to FIG. 3 and Table 1 above, the liquid crystal display panel 10 using the liquid crystal composition LC A of the first embodiment, the liquid crystal display panel (not shown) using the liquid crystal composition LC B of the first comparative example and the second embodiment The 64 gray scale L64 of the liquid crystal display panel (not shown) of the liquid crystal composition LC C of the comparative example corresponds to the first voltage V1 between the pixel electrode 260 and the common electrode layer 280, respectively. The voltage versus transmittance curves VTA, VTB, and VTC of each liquid crystal composition LC A, LC B, and LC C have a tangent slope at the first voltage V1

, Where ∆V _L64 is the difference between the maximum voltage and the minimum voltage in the first voltage range covering the first voltage V1, and ∆T _L64 is the maximum and minimum penetration of the liquid crystal composition in the first voltage range The difference in rate. For example, ΔT _L64A is the difference between the maximum transmittance and the minimum transmittance of the liquid crystal composition _LCA of the first embodiment in the first voltage range. ΔT _L64B is the difference between the maximum transmittance and the minimum transmittance of the liquid crystal composition LC B of the first comparative example in the first voltage range. ΔT _L64C is the difference between the maximum transmittance and the minimum transmittance of the liquid crystal composition LC C of the second embodiment in the first voltage range. The first voltage range is, for example, 1.8V to 1.9V.

符合下式

。舉例而言，本發明之第一實施例的液晶組成物LC A的電壓對穿透率之曲線VT1的第一切線斜率

的數值為10.13（%/V），而第一比較例的液晶組成物LC B的電壓對穿透率之曲線VTB的第二切線斜率

的數值為8.86（%/V）。第二比較例的液晶組成物LC C的電壓對穿透率之曲線VTC的第三切線斜率

的數值為8.25（%/V）。換句話說，第一切線斜率

大於第二切線斜率

或第三切線斜率

。在上述的設置下，在相同的電壓範圍下，第一實施例的液晶組成物LC A的穿透率的提升幅度較第一比較例的液晶組成物LC B或第二比較例的液晶組成物LC C來得高。從另一角度而言，切線斜率

代表液晶組成物LC中的液晶分子之轉動的容易程度（也就是被轉動的效率）。較陡的切線斜率

代表液晶分子在相同電場效應下，越容易受到電壓的驅動。因此，第一實施例的液晶組成物LC A可在低電壓以及低電壓差的情況下被驅動。上述提升液晶分子的轉動的容易程度，可改善並提升殘留電壓釋放速度，以減輕影像殘留的影響。因此，透過調整液晶組成物LC A的擴張彈性係數K ₁₁與彎曲彈性係數K ₃₃的比值K ₁₁/K ₃₃，可以改善液晶組成物LC A的性質，進而提升液晶顯示面板10的性能及顯示品質。 It is worth noting that, in the embodiment of the present invention, the first tangent slope of the voltage vs. transmittance curve VTA of the liquid crystal composition LCA

Meet the following formula

. For example, the first tangent slope of the voltage versus transmittance curve VT1 of the liquid crystal composition LC A of the first embodiment of the present invention

The value of is 10.13 (%/V), and the second tangent slope of the voltage versus transmittance curve VTB of the liquid crystal composition LC B of the first comparative example

The value is 8.86 (%/V). The third tangent slope of the voltage vs. transmittance curve VTC of the liquid crystal composition LC C of the second comparative example

The value of is 8.25 (%/V). In other words, the slope of the first tangent line

Greater than the second tangent slope

Or third tangent slope

. Under the above settings, under the same voltage range, the transmittance of the liquid crystal composition LCA of the first embodiment is improved compared with the liquid crystal composition LC B of the first comparative example or the liquid crystal composition of the second comparative example. LC C came high. From another perspective, the tangent slope

It represents the ease of rotation of the liquid crystal molecules in the liquid crystal composition LC (that is, the efficiency of being rotated). Steeper tangent slope

It means that the liquid crystal molecules are more easily driven by voltage under the same electric field effect. Therefore, the liquid crystal composition LCA of the first embodiment can be driven at a low voltage and a low voltage difference. The aforementioned increase in the ease of rotation of the liquid crystal molecules can improve and increase the release speed of the residual voltage, thereby reducing the effect of image sticking. Thus, the expansion coefficient of elasticity LC A to K ₁₁ and the bending modulus of elasticity ratio of ₃₃ K K ₁₁ / K ₃₃ by adjusting the liquid crystal composition can be improved properties of the liquid crystal composition LC A, thereby enhancing the liquid crystal display performance of panel 10 and the display quality .

4 is a graph of the time versus residual voltage difference of the liquid crystal compositions LCA, LC B, and LCC of the first embodiment, the first comparative example, and the second comparative example of the present invention. Please refer to FIG. 4, the curve TCA represents the time versus residual voltage difference curve of the liquid crystal composition LC A of the first embodiment, and the curve TCB represents the time versus residual voltage difference curve of the liquid crystal composition LC B of the first comparative example. TCC represents the time versus residual voltage difference curve of the liquid crystal composition LCC of the second embodiment.

。殘留電壓差

代表在相同的時間點時，第一色光L1照射的液晶組成物LC與第二色光L2照射的液晶組成物LC，於電壓釋放速度的差異。當上述殘留電壓差

的絕對數值越小時，代表第一色光L1與第二色光L2影響液晶組成物LC的電壓釋放速度的差異越小。換句話說，殘留電壓差

的絕對數值越小時，對應不同色光照射的液晶組成物LC之殘留電壓釋放速度會越一致。因此，可以減輕不同顏色的畫素之間的影像殘留的不一致性，提升液晶顯示面板10的性能及顯示品質。 Please refer to Figure 1, Figure 4 and Table 1 above. The liquid crystal compositions LC A, LC B, and LC C of the first embodiment, the first comparative example, and the second comparative example respectively have a first residue corresponding to the first color light L1 The voltage value V _L1 and the second residual voltage value V _L2 corresponding to the second color light _L2 . At the first time T1, the first residual voltage value V _L1 and the second residual voltage value V _L2 have a residual voltage difference

. Residual voltage difference

It represents the difference in voltage release speed between the liquid crystal composition LC illuminated by the first color light L1 and the liquid crystal composition LC illuminated by the second color light L2 at the same time point. When the above residual voltage difference

The smaller the absolute value of is, the smaller the difference between the first color light L1 and the second color light L2 affecting the voltage release speed of the liquid crystal composition LC is. In other words, the residual voltage difference

The smaller the absolute value of is, the more uniform the release rate of the residual voltage of the liquid crystal composition LC corresponding to different colors of light will be. Therefore, the inconsistency of image retention between pixels of different colors can be reduced, and the performance and display quality of the liquid crystal display panel 10 can be improved.

，符合下式

。舉例而言，本發明之第一實施例的液晶組成物LC A的殘留電壓差

的數值為0.121（V），而第一比較例的液晶組成物LC B的殘留電壓差的數值為0.145（V）。第二比較例的液晶組成物LC C的殘留電壓差的數值為0.167（V）。換句話說，第一實施例的液晶組成物LC A的紅光對藍光之（以第二色光L2為紅光，且第一色光L1為藍光為例）殘留電壓差小於第一比較例的液晶組成物LC B的紅光對藍光之殘留電壓差或第二比較例的液晶組成物LC C的紅光對藍光之殘留電壓差。 It is worth noting that, please refer to Figure 1, Figure 4 and Table 1 above. In the embodiment of the present invention, the backlight module 300 is used to compare the liquid crystal composition LC of the first embodiment, the first comparative example, and the second comparative example. A, LC B, and LC C continuously irradiate the first color light L1 and the second color light L2 for a first time T1. The first time T1 is 3600 seconds (for example: 1 hour). Next, turn off the backlight module 300, and measure the first residual voltage value V _{L1 of the} liquid crystal composition LC A, LC B, and LC C corresponding to the first color light _L1 and the second residual voltage value V _L2 corresponding to the second color light _L2 , And get the residual voltage difference curve TCA, TCB, TCC. Wherein, at the first time T1, the residual voltage difference of the liquid crystal composition LCA of the first embodiment is

, In line with

. For example, the residual voltage difference of the liquid crystal composition LC A of the first embodiment of the present invention

The value of is 0.121 (V), and the value of the residual voltage difference of the liquid crystal composition LC B of the first comparative example is 0.145 (V). The value of the residual voltage difference of the liquid crystal composition LC C of the second comparative example was 0.167 (V). In other words, the residual voltage difference between the red light and the blue light of the liquid crystal composition LC A of the first embodiment (taking the second color light L2 as red light and the first color light L1 as blue light as an example) is smaller than that of the first comparative example The residual voltage difference between the red light and the blue light of the liquid crystal composition LC B or the residual voltage difference between the red light and the blue light of the liquid crystal composition LC C of the second comparative example.

In addition, it can be proved from the experimental data of FIG. 4 that the residual voltage difference of the curve TCA is 0 when the second time T2 is 8400 seconds. The second time T2 is a time point after the first time T1 when the backlight module 300 is turned off. In addition, the residual voltage difference of the curve TCB when the third time T3 is 8900 seconds is zero. The third time T3 is a time point after the first time T1 when the backlight module 300 is turned off. In other words, the difference between the second time T2 and the first time T1 is smaller than the difference between the third time T3 and the first time T1. Therefore, compared with the liquid crystal composition LC B of the first comparative example, the liquid crystal composition LCA of the first embodiment has a better voltage release speed, which reduces the influence of image sticking on the liquid crystal display panel 10. In addition, compared with the liquid crystal composition LC B of the first comparative example, the liquid crystal composition LCA of the first embodiment can have a uniform voltage release speed faster under different colors of light.

In this way, the liquid crystal composition LCA of the first embodiment not only has an improved residual voltage release speed, but also has a more consistent residual voltage release speed under different colors of light. Therefore, the inconsistency of image retention of different colors can be reduced. In this way, the performance and display quality of the liquid crystal display panel 10 can be improved.

In short, since the liquid crystal display panel 10 of the present invention can transmit the elastic coefficient of the liquid crystal composition LC to improve the properties of the liquid crystal composition LC, the ratio of the expansion elastic coefficient K ₁₁ to the bending elastic coefficient K ₃₃ of the liquid crystal composition LC Satisfy K ₁₁ /K ₃₃ ≤0.845. In this way, the liquid crystal composition LC can be easily rotated under the same electric field effect, and the residual voltage release speed can be increased. Therefore, the influence of the image sticking phenomenon on the liquid crystal display panel 10 can be reduced, and the performance and display quality of the liquid crystal display panel 10 can be further improved. In addition, within the range of the ratio of the expansion coefficient of elasticity K ₁₁ to the flexural coefficient of elasticity K ₃₃ , the residual voltage difference of the liquid crystal composition LC can be reduced. In this way, the liquid crystal composition LC can not only increase the residual voltage release speed, but also reduce the impact of image sticking on the liquid crystal display panel 10. It can also have a more consistent residual voltage release speed under different colors of light, thereby reducing the inconsistency of image retention of different colors. Therefore, the performance and display quality of the liquid crystal display panel 10 can be improved.

The following embodiments follow the component numbers and part of the content of the previous embodiments, where the same numbers are used to represent the same or similar components. For the omission of the same technical content, please refer to the aforementioned embodiments. The following embodiments will not Repeat it.

5 is a schematic cross-sectional view of a liquid crystal display panel according to another embodiment of the invention. 1 and 5, the liquid crystal display panel 10A of this embodiment is similar to the liquid crystal display panel 10 of FIG. 1, the main difference is that the common electrode layer 280A of the liquid crystal display panel 10A is disposed on the flat layer 240. For example, the common electrode layer 280A includes a plurality of patterned common electrodes (not labeled). The plurality of pixel electrodes 260 are coplanar with the common electrode layer 280A. In other words, the plurality of pixel electrodes 260 and the common electrode layer 280A are disposed on the same surface of the flat layer 240. The plurality of pixel electrodes 260 and the common electrode layer 280A are separated from each other, and the liquid crystal composition LC is located between any one of the plurality of pixel electrodes 260 and the common electrode layer 280A. From another perspective, the liquid crystal display panel 10A of this embodiment is a liquid crystal display panel in a lateral electric field switching (In-Plane Switching, IPS) mode. In this way, the liquid crystal display panel 10A can achieve similar technical effects as the above-mentioned embodiments.

In summary, the liquid crystal display panel of an embodiment of the present invention can transmit the elastic coefficient of the liquid crystal composition to improve the properties of the liquid crystal composition, so that the ratio of the expansion elastic coefficient K ₁₁ to the flexural elastic coefficient K ₃₃ of the liquid crystal composition Satisfy K ₁₁ /K ₃₃ ≤0.845. In this way, the liquid crystal composition can be easily rotated under the same electric field effect, and the residual voltage release speed can be increased. Therefore, the influence of the image sticking phenomenon on the liquid crystal display panel can be reduced, and the performance and display quality of the liquid crystal display panel can be further improved. In addition, the residual voltage difference of the liquid crystal composition can be reduced in the range of the ratio of the expansion coefficient of elasticity K ₁₁ to the flexural coefficient of elasticity K ₃₃ . In this way, the liquid crystal composition can not only increase the residual voltage release speed, but also reduce the impact of image sticking on the liquid crystal display panel. It can also have a more consistent residual voltage release speed under different colors of light, thereby reducing the inconsistency of image retention of different colors. Therefore, the performance and display quality of the liquid crystal display panel can be improved.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

10. 10A: Liquid crystal display panel 100: First substrate 101: Light incident surface 102: Light exit surface 120: Color filter layer 121: First color light pattern 122: Second color light pattern 123: Third color light pattern 190: First alignment film 200: Second substrate 220: Pixel array 240: Flat layer 260: Pixel electrodes 280, 280A: Common electrode layer 290: Second alignment film 300: Backlight module A-A': Section line DL: Data line L1: first color light L2: second color light L3: third color light L64: 64 gray scales LC, LC A, LC B, LC C: liquid crystal composition PX: pixel PX1: first pixel PX2: first pixel Two pixels PX3: third pixel SL: scanning line T1: first time T2: second time T3: third time TCA, TCB, TCC, VTA, VTB, VTC: curve V1: first voltage WL: beam ∆ (V _L2 -V _L1 ): Residual voltage difference ∆T _L64A , ∆T _L64B , ∆T _L64C : _{Transmittance} difference ∆V _L64 : Voltage difference

FIG. 1 is a schematic cross-sectional view of a liquid crystal display panel according to an embodiment of the invention. 2 is a schematic cross-sectional view of a second substrate and a pixel array of the liquid crystal display panel in FIG. 1. 3 is a graph of voltage versus transmittance of liquid crystal compositions of the first embodiment, the first comparative example, and the second comparative example of the present invention. 4 is a graph of the time versus residual voltage difference of the liquid crystal composition of the first embodiment, the first comparative example, and the second comparative example of the present invention. 5 is a schematic cross-sectional view of a liquid crystal display panel according to another embodiment of the invention.

10: LCD panel 100: The first substrate 101: Glossy surface 102: Glossy surface 120: Color filter layer 121: The first color light pattern 122: The second color light pattern 123: The third color light pattern 190: The first alignment film 200: second substrate 220: pixel array 240: Flat layer 260: Pixel electrode 280: Common electrode layer 290: The second alignment film 300: Backlight module A-A’: Section line L1: the first color light L2: second color light L3: third color light LC: Liquid crystal composition PX: pixel PX1: the first pixel PX2: second pixel PX3: The third pixel WL: beam

Claims (7)

A liquid crystal display panel includes: a first substrate having a light-incident surface and an opposite light-emitting surface; a color filter layer disposed on the light-emitting surface of the first substrate; and a first alignment film disposed on the On the color filter layer; a second substrate disposed opposite to the first substrate; a pixel array disposed on the second substrate, located between the color filter layer and the second substrate, the picture The pixel array includes a pixel electrode; a flat layer disposed on the pixel array, wherein the pixel electrode is disposed on the flat layer; a second alignment film is disposed on the pixel electrode; and a liquid crystal composition The object is disposed between the color filter layer and the pixel electrode, wherein the liquid crystal composition is further located between the first alignment film and the second alignment film, and has the following properties: K ₁₁ /K ₃₃

0.845, where K _{11 is} the coefficient of expansion elasticity of the liquid crystal composition, and K _{33 is} the coefficient of flexural elasticity of the liquid crystal composition. The liquid crystal display panel described in item 1 of the scope of patent application, wherein the liquid crystal composition has a curve of voltage versus transmittance, a first voltage corresponding to 64 gray levels of the liquid crystal display panel, and the curve is in the first Has a first cut slope under voltage

,and

10.13(%/ V ), where ΔV _L64 is the difference between the maximum voltage and the minimum voltage in a first voltage range covering the first voltage, and ΔT _{L64Λ is} the liquid crystal composition in the first voltage range The difference between the maximum penetration rate and the minimum penetration rate. The liquid crystal display panel described in item 1 of the scope of patent application further includes a backlight module disposed adjacent to the light incident surface of the first substrate, the backlight module provides a light beam, and the light beam penetrates the light incident surface The first substrate and the color filter layer form a first color light and a second color light. The liquid crystal display panel described in item 3 of the scope of patent application, wherein the liquid crystal composition has a first residual voltage value corresponding to the first color light and a second residual current voltage value corresponding to the second color light, and For a first time, the first residual voltage value and the second residual voltage value have a residual voltage difference. For the liquid crystal display panel described in item 4 of the scope of patent application, in the first time, the residual voltage difference of the liquid crystal composition is △( V _{L 2} - V _{L 1} ), and |△( V _{L 2} -V _{L 1} )|

0.121 ( V ), where V _{L1 is} the first residual voltage value, and V _{L2 is} the second residual voltage value. The liquid crystal display panel described in item 1 of the scope of patent application further includes a common electrode layer disposed between the pixel array and the flat layer, and the pixel electrode overlaps the common electrode layer. The liquid crystal display panel described in item 1 of the scope of patent application further includes a common electrode layer disposed on the flat layer, the pixel electrode and the common electrode layer are coplanar, and the liquid crystal composition is located between the pixel electrode and Between the common electrode layers.

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