Liquid crystal display panel and display device

Abstract

The invention discloses a liquid crystal display panel and a display device, a liquid crystal layer adopts positive liquid crystal capable of realizing fast response, and adopts positive liquid crystal with delta epsilon less than 4.1, so that compared with the prior art adopting the positive liquid crystal with delta epsilon = 4.1, the embodiment of the invention can increase the driving voltage of the liquid crystal layer, and the liquid crystal response time is calculated according to a liquid crystal response time formula. Because the response time is negatively correlated with the square of the driving voltage and the response time is negatively correlated with the delta epsilon, the increase of the driving voltage has greater influence on the response time compared with the decrease of the response time, so that compared with the prior art that the driving voltage is increased by reducing the delta epsilon, the liquid crystal response time can be reduced, and the liquid crystal display effect is improved. And fast response of the liquid crystal display panel can be realized.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more particularly to a liquid crystal display panel and display device. Background Technology

[0002] Liquid crystal display (LCD) panels are increasingly widely used due to their advantages such as low power consumption, miniaturization, and thinness.

[0003] A liquid crystal display panel typically includes an array substrate and an opposing substrate arranged opposite each other, as well as a liquid crystal layer located between the array substrate and the opposing substrate. The liquid crystal display panel can change the rotation direction of the liquid crystal molecules in the liquid crystal layer by generating an electric field through the pixel electrodes in the array substrate, and achieve display in conjunction with a polarizer. Summary of the Invention

[0004] This invention provides a liquid crystal display panel and display device, which can achieve a high refresh rate and fast response liquid crystal display panel with high transmittance, high contrast, and low power consumption. The specific solution is as follows:

[0005] An embodiment of the present invention provides a liquid crystal display panel, comprising: an array substrate and an opposing substrate disposed opposite to each other, and a liquid crystal layer located between the array substrate and the opposing substrate; wherein, the liquid crystal layer comprises positive liquid crystal, and the dielectric constant along the direction parallel to the long axis of the positive liquid crystal is a horizontal dielectric constant ε. ∥ The dielectric constant along the direction perpendicular to the long axis of the positive liquid crystal is the perpendicular dielectric constant ε. ⊥ , Δε=(ε ∥ -ε ⊥ ) < 4.1.

[0006] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the driving voltage applied to the liquid crystal layer is 6-8V.

[0007] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the rotational viscosity coefficient γ1 of the positive liquid crystal is ≤46mPa·s.

[0008] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the birefringence Δn of the positive liquid crystal is greater than 0.12, and the liquid crystal elastic constant K of the positive liquid crystal is greater than or equal to 11.5.

[0009] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the array substrate includes: a first substrate, a plurality of gate lines located on the side of the first substrate facing the opposing substrate and extending along a first direction, and a plurality of data lines located on the side of the first substrate facing the opposing substrate and intersecting with the gate lines; wherein,

[0010] The gate lines and the data lines define a plurality of pixel units, each pixel unit including a pixel electrode, the pixel electrode including a slit, the extension direction of the slit forming an angle of 10-20° with a second direction, the second direction being perpendicular to the first direction.

[0011] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the thickness of the liquid crystal layer is 1.0-2.5 μm.

[0012] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the grayscale response time of the liquid crystal display panel is 1-3ms.

[0013] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the transmittance of the liquid crystal display panel is 4.0-6.3%.

[0014] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the contrast ratio of the liquid crystal display panel is 800-1500.

[0015] Optionally, the liquid crystal display panel provided in the embodiments of the present invention further includes a spacer between the array substrate and the opposing substrate; the opposing substrate includes a second substrate, and a black matrix layer and a color resist layer located on the side of the second substrate facing the array substrate; the black matrix layer includes a plurality of pixel openings, the color resist layer includes multiple rows of color resist units, the color resist unit includes a plurality of pixel islands spaced apart, and the spacer is disposed in the gap between adjacent pixel islands.

[0016] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the spacer includes a first sub-spacer located on the side of the array substrate facing the opposing substrate and a second sub-spacer located on the side of the opposing substrate facing the array substrate. The first sub-spacer and the second sub-spacer correspond one-to-one, and the surface of the first sub-spacer away from the array substrate contacts the surface of the corresponding second sub-spacer away from the opposing substrate. The orthographic projections of the first sub-spacer and the second sub-spacer on the array substrate intersect.

[0017] Optionally, in the liquid crystal display panel provided in the embodiments of the present invention, the thickness of the first sub-spacer is the same as the thickness of the second sub-spacer.

[0018] Accordingly, embodiments of the present invention also provide a display device, including the liquid crystal display panel described in any of the above embodiments of the present invention.

[0019] Optionally, the display device provided in the embodiments of the present invention further includes a backlight module and a heat dissipation structure. The backlight module is located on the side of the array substrate away from the opposing substrate. The heat dissipation structure includes an annular thermally conductive adhesive. The inner side of the annular thermally conductive adhesive is bonded to the side of the backlight module away from the liquid crystal display panel. The outer side of the annular thermally conductive adhesive is bent to bond the display surface of the liquid crystal display panel to the bonding area of ​​the liquid crystal display panel.

[0020] The heat dissipation structure further includes: a graphene layer located on the inner side of the annular thermally conductive adhesive, facing away from the liquid crystal display panel, and a copper foil layer located on the side of the graphene layer facing away from the liquid crystal display panel, wherein the graphene layer overlaps with the inner portion of the annular thermally conductive adhesive.

[0021] Optionally, in the display device provided in the embodiments of the present invention, the orthographic projection of the graphene layer on the array substrate coincides with the orthographic projection of the copper foil layer on the array substrate, and the orthographic projection area of ​​the graphene layer on the array substrate accounts for at least 1 / 4 of the area of ​​the array substrate. Attached Figure Description

[0022] Figure 1 A cross-sectional schematic diagram of a liquid crystal display panel provided in an embodiment of the present invention;

[0023] Figure 2 This is a partial top view of the array substrate;

[0024] Figure 3 Optical simulation results corresponding to different slit angles in a liquid crystal display panel provided in an embodiment of the present invention;

[0025] Figure 4 Optical simulation results for different box thicknesses;

[0026] Figure 5 VT curves for different liquid crystal materials;

[0027] Figure 6 The simulation results show the response time of liquid crystals in related technologies and the high-pressure, high-transmittance positive liquid crystals provided by this invention.

[0028] Figure 7 The transmittance simulation results are for liquid crystals in related technologies and the high-pressure, high-transmittance positive liquid crystals provided by this invention.

[0029] Figure 8 The contrast simulation results are for liquid crystals in related technologies and the high-pressure, high-transmittance positive liquid crystals provided by this invention.

[0030] Figure 9 A cross-sectional schematic diagram of another liquid crystal display panel provided in an embodiment of the present invention;

[0031] Figure 10 A top view of the spacer;

[0032] Figure 11 This is a top view of the opposing substrate;

[0033] Figure 12 for Figure 11 A schematic diagram illustrating the effect of the corresponding color resist design;

[0034] Figure 13 A plan view of a display device provided in an embodiment of the present invention;

[0035] Figure 14 This is a cross-sectional structural diagram of a display device provided in an embodiment of the present invention;

[0036] Figure 15 This is a cross-sectional schematic diagram of the heat dissipation structure. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Furthermore, the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. Based on the described embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "comprising" or "including," and similar terms used in this invention, mean that the element or object preceding the term encompasses the element or object listed following the term and its equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. Terms such as "inner," "outer," "upper," and "lower" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] As used in this invention, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0040] As used in this invention, "parallel," "perpendicular," and "equal" include the described situation and situations that are similar to the described situation, within an acceptable deviation range, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, "parallel" includes absolute parallelism and approximate parallelism, where the acceptable deviation range for approximate parallelism can be, for example, within 5°; "perpendicular" includes absolute perpendicularity and approximate perpendicularity, where the acceptable deviation range for approximate perpendicularity can also be, for example, within 5°. "Equal" includes absolute equality and approximate equality, where the acceptable deviation range for approximate equality can be, for example, the difference between the two equals being less than or equal to 10% of either one.

[0041] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0042] This invention describes exemplary embodiments with reference to cross-sectional views and / or plan views as idealized exemplary drawings. In the drawings, for clarity, the thickness of layers and the area of ​​regions are enlarged. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0043] In this invention, circles, triangles, rectangles, trapezoids, pentagons, or hexagons are not strictly defined, but can be approximate circles, triangles, rectangles, trapezoids, pentagons, or hexagons. Small deformations due to tolerances are possible, and chamfers, curved edges, and other deformations are possible.

[0044] With the continuous development of display technology, consumers are increasingly demanding higher refresh rates, resolutions, contrast ratios, transmittance, and color gamuts from display panels. A higher refresh rate means the screen refreshes more times per second, resulting in a more stable and smoother image, more natural and clearer display, and less eye strain. High refresh rate screens need to update the displayed image more times per second, requiring a faster response time. Therefore, improving response time under high refresh rates is essential for providing users with a smoother and more comfortable experience.

[0045] This invention provides a liquid crystal display panel, such as... Figure 1 As shown, Figure 1 This is a cross-sectional schematic diagram of a liquid crystal display panel provided in an embodiment of the present invention. The liquid crystal display panel includes: an array substrate 1 and an opposing substrate 2 disposed opposite each other, and a liquid crystal layer 3 located between the array substrate 1 and the opposing substrate 2; wherein, the liquid crystal layer 3 includes positive liquid crystal, and the dielectric constant along the direction parallel to the long axis of the positive liquid crystal is a horizontal dielectric constant ε. ∥ The dielectric constant along the direction perpendicular to the long axis of the positive liquid crystal is the perpendicular dielectric constant ε. ⊥ , Δε=(ε ∥ -ε ⊥ ) < 4.1.

[0046] The liquid crystal display panel provided in this embodiment of the invention uses a positive liquid crystal layer that enables fast response, specifically a positive liquid crystal with Δε < 4.1. Compared to the prior art which uses a positive liquid crystal with Δε = 4.1, this embodiment of the invention can increase the driving voltage of the liquid crystal layer. According to the liquid crystal response time formula, since the response time is negatively correlated with the square of the driving voltage and negatively correlated with Δε, increasing the driving voltage has a greater impact on the response time than decreasing the response time. Therefore, compared to the prior art, this invention can reduce the liquid crystal response time by increasing the driving voltage by reducing Δε, thereby achieving a fast response in the liquid crystal display panel.

[0047] In some embodiments, in the liquid crystal display panel provided in the present invention, such as Figure 2 As shown, Figure 2 This is a partial top view of an array substrate 1, which includes: a first substrate 11; a plurality of gate lines 4 located on the side of the first substrate 11 facing the opposing substrate and extending along a first direction X; and a plurality of data lines 5 located on the side of the first substrate 11 facing the opposing substrate and intersecting with the gate lines 4; wherein,

[0048] The gate line 4 and the data line 5 define a plurality of pixel units. The pixel unit includes a pixel electrode 6. The pixel electrode 6 includes a slit 61. The angle θ (referred to as the slit angle) between the extension direction of the slit 61 and the second direction Y is 10-20°. The second direction Y is perpendicular to the first direction X.

[0049] As shown in Table 1 and Figure 3 As shown in Table 1 and Figure 3The optical simulation results for different slit angles in a liquid crystal display panel provided in this embodiment of the invention show that, with the same liquid crystal layer thickness (i.e., cell thickness of 2.8 μm), increasing the slit angle from 5° in related technologies to 20° increases the driving voltage (V) of the liquid crystal layer by 0.7V, reduces the transmittance (Tr.) of the liquid crystal display panel by 8%, and speeds up the response time (RT) by 27%. To improve the response time, this invention can use a slit angle of 10-20°. This embodiment uses a slit angle of 15° as an example. Compared to the pixel slit angle (5°) in related technologies, the liquid crystal display panel provided in this embodiment increases the driving voltage (V) by 0.2-0.7V, reduces the transmittance (Tr.) by 2-8%, and speeds up the response time (RT) by 16-27%. Therefore, while achieving an ultra-fast response time, it minimizes the decrease in transmittance (Tr.) and the increase in driving voltage (V), thereby reducing the increase in backlight power consumption and logic power consumption.

[0050] Table 1. Optical simulation results for different slit angles

[0051]

[0052] The formula for the response time of a liquid crystal display panel is as follows:

[0053] Descent time:

[0054] Ascent time:

[0055] The formula for calculating the transmittance of a liquid crystal display panel is as follows:

[0056]

[0057] Where γ1 is the rotational viscosity coefficient of the liquid crystal, K is the elastic constant of the liquid crystal, d is the thickness of the liquid crystal layer (i.e., cell thickness); V is the driving voltage applied to the liquid crystal layer, V th denoted as the threshold voltage of the liquid crystal, Φ as the azimuth angle of the liquid crystal rotation, Δn as the birefringence of the liquid crystal, and λ as the emission wavelength.

[0058] In some embodiments, in the liquid crystal display panel provided in the present invention, such as Figure 1 As shown, the thickness (i.e., cell thickness) of the liquid crystal layer 3 can be 1.0-2.5μm. In this embodiment of the invention, the thickness of the liquid crystal layer 3 is 1.7μm as an example.

[0059] The cell thickness of high refresh rate liquid crystal display panels in related technologies is approximately 2.8 μm, with a large number of liquid crystal layers. According to the theory of continuous liquid crystal elastomers, the distance from the first liquid crystal layer closest to the pixel electrode to the last liquid crystal layer furthest from the pixel electrode is relatively large. Therefore, the time required for the first liquid crystal layer to begin rotating and transferring to the last liquid crystal layer under voltage drive is relatively long, resulting in a slow response time. The response time calculation formula also shows that the response time is directly proportional to the cell thickness (d) of the liquid crystal display panel. Furthermore, the transmittance calculation formula shows that within a certain range of cell thickness, transmittance decreases as the cell thickness (d) decreases.

[0060] As shown in Table 2 and Figure 4 As shown in Table 2 and Figure 4 Optical simulation results for different cell thicknesses show that, at the same driving voltage (V = 5.7V), reducing the cell thickness from 2.8μm in related technologies to 1.6μm results in a 49% decrease in transmittance (Tr.) and a 61% increase in response time (RT) for the liquid crystal display panel. Improving response time (RT) by reducing cell thickness (d) results in a significant loss of transmittance (Tr.), and the increased backlight power consumption leads to an increase in the total power consumption of the liquid crystal display panel.

[0061] Table 2. Optical simulation results for different box thicknesses

[0062]

[0063] To achieve an extremely fast response time, this invention employs an ultra-low cell thickness (1.0-2.5 μm) design, significantly reducing the phase retardation of the liquid crystal. This reduces the luminous efficacy of the liquid crystal, leading to a decrease in the transmittance of the liquid crystal display panel, affecting brightness and power consumption. Therefore, to achieve an extremely fast response time while minimizing the decrease in transmittance (Tr.) and the increase in driving voltage (V), the high refresh rate liquid crystal display panel provided in this invention uses a novel high-voltage, high-transmittance, fast-response positive liquid crystal material. Compared to liquid crystal materials in related technologies, this positive liquid crystal material reduces the dielectric constant Δε. Taking Δε = 3.4 as an example, reducing Δε can increase the driving voltage. Figure 5 As can be seen from the VT (T is the transmittance Tr.) curves corresponding to different liquid crystal materials, compared with the liquid crystal materials in related technologies, the high voltage liquid crystal (High Voltage LC) provided in this embodiment of the invention can increase the transmittance by 7.2% when the driving voltage V is increased by 1.1V; the driving voltage (V) applied to the liquid crystal layer provided in this embodiment of the invention can be 6-8V, thereby achieving high transmittance while having a fast response.

[0064] In some embodiments, in the liquid crystal display panel provided in the present invention, the birefringence Δn of the positive liquid crystal is greater than 0.12. According to the transmittance calculation formula, the birefringence Δn of the high-pressure positive liquid crystal material provided in the present invention is increased from 0.1168 in the related art to >0.12. Taking Δn = 0.1422 as an example, the present invention significantly increases the Phase Retardation (Δnd) under low cell thickness, and greatly improves the transmittance of the low cell thickness liquid crystal display panel.

[0065] In some embodiments, in the liquid crystal display panel provided in the present invention, the rotational viscosity coefficient γ1 of the positive liquid crystal is ≤46 mPa·s, and the present invention takes γ1=46 mPa·s as an example.

[0066] In some embodiments, in the liquid crystal display panel provided in the present invention, the liquid crystal elastic constant K of the positive liquid crystal is ≥11.5. Taking K=12.3 as an example in the present invention, it can be seen from the response time calculation formula that, compared with the elastic constant of liquid crystal material in related technologies being 11.2, the liquid crystal elastic constant K of the positive liquid crystal used in the present invention is increased, the driving voltage V of the liquid crystal layer is increased, the cell thickness is reduced, and γ1 is basically maintained at a low value, so as to achieve the ultimate response time.

[0067] Liquid crystal scattering coefficient (S cell The calculation formula is as follows:

[0068]

[0069] Where CR is the contrast ratio, n O n is the refractive index of ordinary light for a positive liquid crystal. e The refractive index of the non-normal light of the negative liquid crystal.

[0070] Specifically, the contrast ratio is the ratio of the brightness of the bright state L255 to the brightness of the dark state L0, i.e.: CR = L255 / L0.

[0071] As can be seen from the above formula for calculating the scattering coefficient, the increase in the birefringence Δn of the high-pressure, high-transmittance positive liquid crystal provided in this embodiment of the invention increases the scattering coefficient (S). cell An increase in ) will cause a decrease in contrast ratio (CR).

[0072] As shown in Table 3 and Figures 6-8 As shown in Table 3 and Figures 6-8The different optical simulation results correspond to the liquid crystal (MP LC) in the related technology and the high-voltage high-transmittance positive liquid crystal (HV LC) provided by the present invention. The high refresh rate gaming liquid crystal display panel in the related technology has a GTG (gray-to-gray response time) of 3ms when over-drive is open, a cell thickness of 2.8μm, a driving voltage (V) of 5.7V, uses a 6V IC (driver chip), a contrast ratio of 1200:1, and a transmittance of 100% as a benchmark. To achieve a fast response time of 2ms for GTG, using MP LC requires a cell thickness of 2.1μm with a constant driving voltage (V). However, due to a significant decrease in Δnd, the transmittance drops by 23%, leading to reduced brightness at L255 and a contrast ratio of 1150:1. When using the HV LC provided by this invention, a higher driving voltage is required, allowing for the use of a 7V IC. For example, the driving voltage (V) can be increased to 6.8V. In this case, the cell thickness can be increased to 2.2μm. Because HV LC has a larger Δn, the transmittance only decreases by 2%. The backlight power consumption of this invention is comparable to that of a 3ms response time in related technologies. However, the increased Δn leads to an increase in the liquid crystal scattering coefficient, resulting in a contrast ratio of 1070:1. To achieve a GTG 1ms ultra-fast response time, MP LC requires a cell thickness of 1.6μm and a driving voltage (V) of 5.7V. At this point, the transmittance drops by about 50% due to a significant decrease in Δnd, resulting in a reduction in L255 brightness and a contrast ratio of 870:1. When using the HV LC provided by this invention, for example, by increasing the driving voltage (V) to 6.8V, the cell thickness can be increased to 1.7μm. Because HV LC has a larger Δn, the transmittance only decreases by 26%. Compared to using MP LC, this invention results in less backlight power consumption loss and maintains a higher contrast ratio of 1000:1.

[0073] Table 3. Optical simulation results of different liquid crystal materials at different cell thicknesses

[0074]

[0075] As shown in Table 4, in this embodiment of the invention, at an ultra-high refresh rate (e.g., 600Hz), a high-voltage high-transmittance liquid crystal (HVLC) with an ultra-low cell thickness (1.7μm) and a driving voltage (V) of 6.8V is used. Due to the increase in refresh rate and driving voltage, the measured logic power consumption increases by 1.44W, the measured transmittance is 4.8% (a 24% decrease compared to related technologies), the backlight power consumption (BLU PowerMax) increases by 0.13W, the measured contrast ratio is 1060:1 (a 160% decrease compared to related technologies), and the measured response time with OD enabled is improved to 1.03ms (a 70% decrease compared to related technologies). Using the HVLC provided in this embodiment of the invention, an ultra-fast response time (GTG) of 1.0ms can be achieved for ultra-high refresh rate liquid crystal display panels.

[0076] Table 4. Measured Optical and Power Consumption Data for Different LCD Panels

[0077]

[0078] In some embodiments, the grayscale response time of the liquid crystal display panel provided in the present invention is 1-3ms.

[0079] In some embodiments, the transmittance of the liquid crystal display panel provided in the present invention is 4.0-6.3%.

[0080] In some embodiments, the contrast ratio of the liquid crystal display panel provided in the present invention is 800-1500.

[0081] As shown in Table 5, Table 5 contains the measured GTG data corresponding to the HV LC provided by the embodiments of the present invention.

[0082] Table 5. Measured GTG data corresponding to high-voltage positive liquid crystals

[0083]

[0084] As can be seen from Table 5, the average response time for switching between any gray levels within the L0-L255 grayscale range is 1.03ms. Therefore, by using the HV LC provided in the embodiments of the present invention, an ultra-fast response time of 1ms can be achieved.

[0085] This invention is not limited to ultra-high refresh rate LCD panels of 480Hz or 600Hz. It is also applicable to high refresh rate LCD panels with refresh rates greater than 60Hz and ultra-fast response times, especially LCD panels with a GTG 1ms ultra-fast response. Achieving a GTG 1ms requires the use of a high-voltage, high-transmittance, fast-response liquid crystal with liquid crystal parameters Δn > 0.12, Δε < 4.1, γ1 ≤ 46 mPa·s, and K ≥ 11.5. Therefore, the LCD panel provided by this invention, while possessing advantages such as high transmittance, high contrast, and low power consumption, also achieves a fast response speed (1ms level), thus exhibiting excellent overall performance.

[0086] In some embodiments, in the liquid crystal display panel provided in the present invention, such as Figure 9 and Figure 10 As shown, Figure 10 This is a top view of the spacer 7, which also includes the spacer 7 located between the array substrate 1 and the opposing substrate 2; as shown... Figure 11 and Figure 12 As shown, Figure 11 This is a top view of the opposing substrate. Figure 12 for Figure 11 The corresponding schematic diagram of the color resist design shows that the opposing substrate 2 includes a second substrate, and a black matrix layer 8 and a color resist layer 9 located on the side of the second substrate facing the array substrate 1. The black matrix layer 8 includes multiple pixel openings, and the color resist layer 9 includes multiple rows of color resist units (for example, an adjacent row of red color resist R, a row of green color resist G, and a row of blue color resist B constitute a row of color resist units). In related technologies, the RGB color resists are placed on the black matrix layer 8, and the RGB colors are all continuous strip structures. There are step differences between the RGB color resists, and the spacers are placed on the color resists. Due to the step differences in the color resists, the uniformity of the spacers deteriorates. In addition, with the extremely low cell thickness design, the spacers need to be made to be less than 1μm. Therefore, the uniformity of the spacers and their dimensions deteriorates, ultimately leading to a deterioration in the uniformity of the cell thickness. In this embodiment of the invention, the color resist unit is configured to include multiple pixel islands (91) spaced apart, and spacers 7 are provided in the gaps between adjacent pixel islands 91. In this way, the RGB color resist adopts a pixel island design, and the spacers are placed directly on the black matrix layer 8. The black matrix layer 8 has high flatness. At this time, the actual thickness of the spacers 7 is the thickness of the spacers in the related technology plus the thickness of the color resist (2~4μm). The actual thickness of the spacers 7 will be greater than 2μm. The spacers 7 and the size uniformity are both increased, thereby improving the uniformity of the cell thickness and improving defects such as black and white blocks and vertical lines.

[0087] In some embodiments, in the liquid crystal display panel provided in the present invention, such as Figure 9 and Figure 10As shown, the spacer 7 includes a first sub-spacer 71 located on the side of the array substrate 1 facing the opposing substrate 2 and a second sub-spacer 72 located on the side of the opposing substrate 2 facing the array substrate 1. The first sub-spacer 71 and the second sub-spacer 72 correspond one-to-one, and the surface of the first sub-spacer 71 away from the array substrate 1 contacts the surface of the corresponding second sub-spacer 72 away from the opposing substrate 2. The orthographic projections of the first sub-spacer 71 and the second sub-spacer 72 on the array substrate 1 intersect. In this way, the spacer 7 adopts an intersecting design, so even if the spacer 7 slides when the liquid crystal display panel is pressed, the intersecting first sub-spacer 71 and the second sub-spacer 72 will not contact the upper and lower substrates, thereby preventing damage to the upper and lower substrates.

[0088] In some embodiments, in the liquid crystal display panel provided in the present invention, such as Figure 9 As shown, the thickness of the first sub-spacer 71 and the thickness of the second sub-spacer 72 can be the same, so that the spacers 7 are evenly distributed on both sides of the liquid crystal display panel. Since the actual thickness of the spacers 7 will be greater than 2μm, the thickness of the first sub-spacer 71 and the thickness of the second sub-spacer 72 are both greater than 1μm. The uniformity of the dimensions of the first sub-spacer 71 and the second sub-spacer 72 is increased, thereby improving the uniformity of cell thickness and improving defects such as black and white blocks and vertical lines.

[0089] As shown in Table 6, Table 6 presents the cell thickness fluctuation specifications and measured data corresponding to the liquid crystal display panel provided by the related technologies and the present invention. The color resist layer in the related technologies adopts a continuous strip structure with a cell thickness of 2.8±0.1μm. The color resist layer in the embodiment of the present invention adopts a pixel island design with an ultra-low cell thickness of 1.7±0.06μm. It can be seen that the Cpk value measured in the embodiment of the present invention is 2.15 (>1.33). Therefore, the cell thickness uniformity of the present invention is improved, thereby improving defects such as black and white blocks and vertical lines.

[0090] Table 6. Cell thickness fluctuation specifications and measured data for different LCD panels

[0091]

[0092] In summary, the liquid crystal display panel provided by this invention, in terms of structure, adopts a 10-20° high pixel slit angle and a 1.7μm ultra-low liquid crystal cell thickness design to assist in achieving an extremely fast response time. It employs an RGB color resist pixel island design, using the height of the RGB color resist to increase the actual height of the spacers, improving the uniformity of the spacer height under ultra-low liquid crystal cell thickness, thus enhancing the in-plane cell thickness uniformity and improving defects such as black-and-white blocks and vertical lines in ultra-low cell thickness panels. In terms of materials, it uses a high-voltage, high-transmittance, fast-response positive liquid crystal with high birefringence, low dielectric constant, and low rotational viscosity coefficient, maintaining a high level of liquid crystal transmittance under ultra-low cell thickness. The increased driving voltage of the liquid crystal, combined with a 7V high-voltage IC and a 600Hz ultra-high refresh rate, achieves an extremely fast GTG 1ms response time.

[0093] In some embodiments of the present invention, the liquid crystal display panel provided above may also include other structures known to those skilled in the art.

[0094] Based on the same inventive concept, embodiments of the present invention also provide a display device, such as... Figure 13 and Figure 14 As shown, the display device includes the liquid crystal display panel 100 provided in the embodiments of the present invention, and the display device has technical effects corresponding to the beneficial technical effects of the liquid crystal display panel it includes.

[0095] In some embodiments, in the display device provided in the present invention, such as Figure 13 and Figure 14 As shown, it also includes a backlight module 200 and a heat dissipation structure 300. The backlight module 200 is located on the side of the array substrate away from the opposing substrate. The heat dissipation structure 300 includes an annular thermally conductive adhesive 301. The inner side of the annular thermally conductive adhesive 301 is bonded to the side of the backlight module 200 away from the liquid crystal display panel 100, and the outer side of the annular thermally conductive adhesive 301 is bent to the display surface of the liquid crystal display panel 100 and bonded to the bonding area of ​​the liquid crystal display panel 100.

[0096] The heat dissipation structure 300 further includes: a graphene layer 302 located on the inner side of the annular thermally conductive adhesive 301 facing away from the liquid crystal display panel 100, and a copper foil layer 303 located on the side of the graphene layer 302 facing away from the liquid crystal display panel 100. The graphene layer 302 overlaps with the inner portion of the annular thermally conductive adhesive 301. This invention utilizes the thermally conductive adhesive layer 301 to rapidly transfer heat generated in the bonding area to the graphene layer 302. After passing through the graphene layer 302, the heat is quickly and evenly distributed horizontally, and then rapidly transferred vertically to the copper foil layer 303. Finally, heat is dissipated through thermal radiation from the surface copper foil layer. This multi-step synergistic effect achieves the effect of rapidly reducing the temperature at the center of the heat source.

[0097] In some embodiments, in the display device provided in the present invention, such as Figures 13-15 As shown, the orthographic projection of the graphene layer 302 on the array substrate coincides with the orthographic projection of the copper foil layer 303 on the array substrate, and the orthographic projection area of ​​the graphene layer 302 on the array substrate occupies at least 1 / 4 of the array substrate area. For example, the orthographic projection area of ​​the graphene layer 302 on the array substrate can occupy 1 / 4, 1 / 3, or 1 / 2 of the array substrate area, or the orthographic projection area of ​​the graphene layer 302 on the array substrate can be the same as the array substrate area, which can improve the heat dissipation effect.

[0098] like Figure 15 As shown, Figure 15 This is a cross-sectional view of the heat dissipation structure 300 when it is not bonded to the liquid crystal display panel 100. A release layer 400 is bonded to the side of the thermally conductive adhesive 301 away from the graphene layer 302 to provide protection. When the heat dissipation structure 300 is bonded to the liquid crystal display panel 100, the release layer 400 can be removed.

[0099] As shown in Table 7, IC_1 / IC_2 / IC_3 / IC_4 refer to the positions of the four Source ICs in the high refresh rate LCD panel. These IC locations correspond to the areas where the high refresh rate LCD panel experiences the most severe heat generation. When using the LCD panel in related technologies, the highest heat generation temperature reached 101.2℃. The clearing point Tni of a conventional high refresh rate LCD is 75℃. The heat generation temperature at the IC is much higher than the clearing point of the liquid crystal. Near the IC, the liquid crystal transitions from a liquid crystal state to a liquid state, losing its birefringence properties, resulting in a black screen and abnormal display near the IC. Increasing the liquid crystal Tni to improve the heat generation problem would increase the rotational viscosity of the liquid crystal, causing a slower response time. Figures 13-15 As shown, this embodiment of the invention employs a high-performance, uniform heat dissipation structure 300. This structure 300 includes a copper foil layer 303, a graphene layer 302, and a thermally conductive adhesive layer 301, providing excellent thermal conductivity, uniform heat dissipation, and heat dissipation. As shown in Table 7, when the display device is displaying normally, the IC generates heat. Using the high-performance, uniform heat dissipation structure 300 provided in this embodiment, the highest temperature at the IC is 65.4℃, which is 35.8℃ lower than in related technologies and lower than the clearing point of high refresh rate liquid crystals, thus avoiding blackening and abnormal image quality caused by heat exceeding the clearing point of the liquid crystal.

[0100] Table 7. Temperature test data at the IC corresponding to related technologies and this invention.

[0101]

[0102] This invention provides a liquid crystal display panel and display device. The liquid crystal layer uses positive liquid crystal that enables fast response, specifically positive liquid crystal with Δε < 4.1. Compared to the prior art using positive liquid crystal with Δε = 4.1, this invention can increase the driving voltage of the liquid crystal layer. According to the liquid crystal response time formula, since the response time is negatively correlated with the square of the driving voltage and negatively correlated with Δε, increasing the driving voltage has a greater impact on the response time than decreasing the response time. Therefore, compared to the prior art, this invention increases the driving voltage by reducing Δε, thereby reducing the liquid crystal response time and achieving fast response of the liquid crystal display panel.

[0103] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A liquid crystal display panel, characterized in that, include: An array substrate and a counter substrate are disposed opposite to each other, and a liquid crystal layer is located between the array substrate and the counter substrate; wherein the liquid crystal layer comprises positive liquid crystal, and the dielectric constant along the direction parallel to the long axis of the positive liquid crystal is a horizontal dielectric constant ε. ∥ The dielectric constant along the direction perpendicular to the long axis of the positive liquid crystal is the perpendicular dielectric constant ε. ⊥ , Δε=(ε ∥ -ε ⊥ ) < 4.

1.

2. The liquid crystal display panel as described in claim 1, characterized in that, The driving voltage applied to the liquid crystal layer is 6-8V.

3. The liquid crystal display panel as described in claim 1, characterized in that, The rotational viscosity coefficient γ1 of the positive liquid crystal is ≤46 mPa·s.

4. The liquid crystal display panel as described in claim 1, characterized in that, The positive liquid crystal has a birefringence Δn > 0.12 and a liquid crystal elastic constant K ≥ 11.

5.

5. The liquid crystal display panel as described in any one of claims 1-4, characterized in that, The array substrate includes: a first substrate, a plurality of gate lines located on the side of the first substrate facing the opposing substrate and extending along a first direction, and a plurality of data lines located on the side of the first substrate facing the opposing substrate and intersecting the gate lines; wherein... The gate lines and the data lines define a plurality of pixel units, each pixel unit including a pixel electrode, the pixel electrode including a slit, the extension direction of the slit forming an angle of 10-20° with a second direction, the second direction being perpendicular to the first direction.

6. The liquid crystal display panel as described in any one of claims 1-4, characterized in that, The thickness of the liquid crystal layer is 1.0-2.5 μm.

7. The liquid crystal display panel as described in any one of claims 1-4, characterized in that, The grayscale response time of the liquid crystal display panel is 1-3ms.

8. The liquid crystal display panel as described in any one of claims 1-4, characterized in that, The transmittance of the liquid crystal display panel is 4.0-6.3%.

9. The liquid crystal display panel as described in any one of claims 1-4, characterized in that, The contrast ratio of the liquid crystal display panel is 800-1500.

10. The liquid crystal display panel according to any one of claims 1-4, characterized in that, It also includes a spacer between the array substrate and the opposing substrate; the opposing substrate includes: a second substrate, and a black matrix layer and a color resist layer on the side of the second substrate facing the array substrate; the black matrix layer includes a plurality of pixel openings, the color resist layer includes a plurality of rows of color resist units, the color resist unit includes a plurality of pixel islands spaced apart, and the spacer is disposed in the gap between adjacent pixel islands.

11. The liquid crystal display panel as described in claim 10, characterized in that, The spacer includes a first sub-spacer located on the side of the array substrate facing the opposing substrate and a second sub-spacer located on the side of the opposing substrate facing the array substrate. The first sub-spacer and the second sub-spacer correspond one-to-one, and the surface of the first sub-spacer away from the array substrate contacts the surface of the corresponding second sub-spacer away from the opposing substrate. The orthographic projections of the first sub-spacer and the second sub-spacer on the array substrate intersect.

12. The liquid crystal display panel as described in claim 11, characterized in that, The thickness of the first sub-spacer is the same as the thickness of the second sub-spacer.

13. A display device, characterized in that, Including the liquid crystal display panel as described in any one of claims 1-12.

14. The display device as claimed in claim 13, characterized in that, It also includes a backlight module and a heat dissipation structure. The backlight module is located on the side of the array substrate away from the opposing substrate. The heat dissipation structure includes an annular thermally conductive adhesive. The inner side of the annular thermally conductive adhesive is bonded to the side of the backlight module away from the liquid crystal display panel. The outer side of the annular thermally conductive adhesive is bent to bond the display surface of the liquid crystal display panel to the bonding area of ​​the liquid crystal display panel. The heat dissipation structure further includes: a graphene layer located on the inner side of the annular thermally conductive adhesive, facing away from the liquid crystal display panel, and a copper foil layer located on the side of the graphene layer facing away from the liquid crystal display panel, wherein the graphene layer overlaps with the inner portion of the annular thermally conductive adhesive.

15. The display device as claimed in claim 14, characterized in that, The orthographic projection of the graphene layer on the array substrate coincides with the orthographic projection of the copper foil layer on the array substrate, and the area of ​​the orthographic projection of the graphene layer on the array substrate is at least 1 / 4 of the area of ​​the array substrate.

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