Liquid crystal display panel and liquid crystal display device

Abstract

The invention discloses a liquid crystal display panel and a liquid crystal display device.The liquid crystal display panel comprises a graphene heating layer, a color film substrate, an array substrate opposite to the color film substrate and a liquid crystal layer located between the color film substrate and the array substrate, and the graphene heating layer comprises a first graphene heating layer; the first graphene heating layer is arranged on the color film substrate. By arranging the graphene heating layer on the liquid crystal display panel, in the heating mode, the graphene heating layer can heat and heat the liquid crystal layer, so that the flowability of liquid crystal molecules in the liquid crystal layer is improved, and the response speed of the liquid crystal display panel in a low-temperature environment is increased; therefore, the liquid crystal display panel can stably operate in environments with different temperatures; and in a screen-off color-changing mode, the first graphene heating layer applies a corresponding light-emitting signal, so that the liquid crystal display panel can present a corresponding color.

Description

Technical Field

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

[0002] Liquid Crystal Display (LCD) has many advantages such as thin body, power saving, no radiation, etc., and has been widely used, such as LCD TV, mobile phone, personal digital assistant (PDA), digital camera, computer screen or notebook computer screen, etc., and it occupies a dominant position in the field of flat panel display.

[0003] Traditional liquid crystal display devices are composed of a color filter substrate (CF), a thin film transistor array substrate (TFT Array Substrate), and a liquid crystal layer (Liquid Crystal Layer) filled between the two substrates. Traditional liquid crystal display devices achieve color display by using a color filter coated with red, green, blue and other color resists to filter the monochromatic light (usually white light) provided by the backlight module. Usually, three sub-pixels of the same aperture ratio of red, green and blue are set to form a pixel. Due to the filtering property of the color resist, red light, green light and blue light of different intensities can be obtained, and a color picture is presented by mixing the three primary colors of red, green and blue.

[0004] However, the fluidity of liquid crystal molecules is affected by temperature, which results in the response speed of liquid crystal display devices being affected by temperature. The lower the temperature, the worse the fluidity of liquid crystal molecules and the slower the response speed of liquid crystal display devices. With the increasing development of in-vehicle displays, in-vehicle display devices need to adapt to various environments, especially in low temperature environments, which poses a great challenge to the startup of liquid crystal display devices. In this case, various designs need to be made to the structure of liquid crystal display devices to improve the response speed of liquid crystal display devices. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, an object of the present invention is to provide a liquid crystal display panel and a liquid crystal display device to solve the problem of slow response speed of the liquid crystal display device in the prior art under low temperature environment.

[0006] The purpose of the present invention is achieved through the following technical solutions: The present invention provides a liquid crystal display panel, comprising a graphene heating layer, a color filter substrate, an array substrate arranged opposite to the color filter substrate, and a liquid crystal layer located between the color filter substrate and the array substrate, wherein the graphene heating layer comprises a first graphene heating layer, and the first graphene heating layer is arranged on the color filter substrate; In the heating mode, the first graphene heating layer applies a heating signal to heat the liquid crystal layer; in the screen-off color-changing mode, the first graphene heating layer applies a corresponding light-emitting signal to display the corresponding color.

[0007] Furthermore, a first polarizer is provided on a side of the color filter substrate away from the liquid crystal layer, and the first graphene heating layer is provided between the color filter substrate and the first polarizer; Alternatively, a first polarizer and a cover plate are provided on a side of the color film substrate away from the liquid crystal layer, and the first graphene heating layer is provided between the first polarizer and the cover plate.

[0008] Furthermore, the first graphene heating layer is arranged on a side of the color film substrate facing the liquid crystal layer.

[0009] Furthermore, the first graphene heating layer includes a plurality of mutually independent graphene blocks, and the plurality of graphene blocks are distributed in an array; In the heating mode, all the graphene blocks apply a heating signal to heat the liquid crystal layer; in the off-screen display mode, each of the graphene blocks applies a corresponding light-emitting signal to display a corresponding pattern.

[0010] Furthermore, the color film substrate is provided with a plurality of first scan lines, a plurality of first data lines, a plurality of first thin film transistors and a plurality of common wirings, one end of each of the graphene blocks is electrically connected to the first scan line and the first data line adjacent to the first thin film transistor through the corresponding first thin film transistor, and the other end of each of the graphene blocks is electrically connected to the corresponding common wiring.

[0011] Furthermore, the color film substrate is provided with a plurality of first scanning lines, a plurality of first data lines, a plurality of first thin film transistors, a plurality of electrode blocks and a common electrode layer, the graphene blocks are arranged between the electrode blocks and the common electrode layer and correspond one-to-one to the electrode blocks, and each of the electrode blocks is electrically connected to the first scanning lines and the first data lines adjacent to the first thin film transistor through the corresponding first thin film transistor.

[0012] Further, the graphene heating layer includes a second graphene heating layer, and the second graphene heating layer is disposed on the array substrate; In the heating mode, the second graphene heating layer applies a heating signal to heat the liquid crystal layer.

[0013] Furthermore, a second polarizer is provided on a side of the array substrate away from the liquid crystal layer, and the second graphene heating layer is provided between the array substrate and the second polarizer; Alternatively, the second graphene heating layer is disposed on a side of the array substrate facing the liquid crystal layer.

[0014] Furthermore, the graphene heating layer is a grid structure and corresponds to the black matrix on the color film substrate.

[0015] The present application also provides a liquid crystal display device, comprising the liquid crystal display panel as described above.

[0016] The beneficial effect of the present invention is that: by arranging a graphene heating layer on the liquid crystal display panel, in the heating mode, the graphene heating layer can generate heat and heat the liquid crystal layer to improve the fluidity of the liquid crystal molecules in the liquid crystal layer, thereby improving the response speed of the liquid crystal display panel in a low temperature environment, so that the liquid crystal display panel can operate stably in environments with different temperatures; and the graphene heating layer includes a first graphene heating layer arranged on the color film substrate, and in the screen-off color-changing mode, the first graphene heating layer applies a corresponding light-emitting signal so that the liquid crystal display panel can present a corresponding color. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of the liquid crystal display device in the dark state in the first embodiment of the present invention.

[0018] Figure 2 1 is a schematic diagram of the structure of the liquid crystal display device in the bright state in the first embodiment of the present invention.

[0019] Figure 3 This is one of the circuit structure diagrams of the liquid crystal display device in the first embodiment of the present invention.

[0020] Figure 4 This is the second circuit structure diagram of the liquid crystal display device in the first embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of the heat generation simulation of the graphene film layer in the first embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of the light emission simulation of the graphene film layer in the first embodiment of the present invention.

[0023] Figure 7 It is a schematic diagram of the planar structure of the color film substrate in the first embodiment of the present invention.

[0024] Figure 8 It is a schematic diagram of the planar structure of the array substrate in the first embodiment of the present invention.

[0025] Fig. 9 It is a schematic diagram of the structure of the liquid crystal display device in the dark state in the second embodiment of the present invention.

[0026] Fig.10 It is a schematic structural diagram of the liquid crystal display device in the bright state in the second embodiment of the present invention.

[0027] Fig.11 It is a schematic diagram of the circuit structure of the liquid crystal display device in the second embodiment of the present invention.

[0028] Fig.12 It is a schematic diagram of the structure of the liquid crystal display device in the dark state in the third embodiment of the present invention.

[0029] Fig.13 It is a schematic diagram of the structure of the liquid crystal display device in the bright state in the third embodiment of the present invention.

[0030] Fig.14 It is a schematic diagram of the circuit structure of the liquid crystal display device in the third embodiment of the present invention.

[0031] Fig.15 It is a schematic diagram of the structure of the liquid crystal display device in the fourth embodiment of the present invention in the dark state.

[0032] Fig.16 It is a schematic diagram of the structure of the liquid crystal display device in the bright state in the fourth embodiment of the present invention.

[0033] Fig.17 It is a schematic diagram of the circuit structure of the liquid crystal display device in the fourth embodiment of the present invention.

[0034] Fig.18 It is a schematic structural diagram of the liquid crystal display device in the dark state in the fifth embodiment of the present invention.

[0035] Fig.19 It is a schematic diagram of the structure of the liquid crystal display device in the dark state in the sixth embodiment of the present invention.

[0036] Fig. 20 It is a schematic diagram of the structure of the liquid crystal display device in the bright state in the sixth embodiment of the present invention.

[0037] Fig.21 It is a schematic diagram of the circuit planar structure of the color film substrate in the sixth embodiment of the present invention.

[0038] Figures 22a to 22d It is a schematic diagram of the manufacturing process of the first graphene heating layer on the color film substrate in the sixth embodiment of the present invention.

[0039] Fig.23It is a schematic structural diagram of the liquid crystal display device in the dark state in the seventh embodiment of the present invention.

[0040] Fig.24 It is a schematic diagram of the circuit planar structure of the color film substrate in the seventh embodiment of the present invention. DETAILED DESCRIPTION

[0041] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the liquid crystal display panel and the liquid crystal display device proposed according to the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments: [Example 1] Figure 1 It is a schematic structural diagram of the liquid crystal display device in the dark state in the first embodiment of the present invention. Figure 2 Schematic diagram of the structure of the liquid crystal display device in the bright state in the first embodiment of the present invention. Figure 1 and Figure 2 As shown, a liquid crystal display panel provided by the first embodiment of the present invention includes a graphene heating layer 40, a color filter substrate 10, an array substrate 20 arranged opposite to the color filter substrate 10, and a liquid crystal layer 30 located between the color filter substrate 10 and the array substrate 20, and the graphene heating layer 40 is used to heat the liquid crystal layer 30. Among them, the graphene heating layer 40 is a planar structure that covers the entire surface of the liquid crystal display panel, so that the graphene heating layer 40 can generate heat and heat the liquid crystal layer 30, so as to improve the fluidity of the liquid crystal molecules in the liquid crystal layer 30, thereby improving the response speed of the liquid crystal display panel in a low temperature environment, so that the liquid crystal display panel can operate stably in environments with different temperatures.

[0042] In this embodiment, the graphene heating layer 40 includes a first graphene heating layer 41, which is disposed on the color filter substrate 10, and the first graphene heating layer 41 covers the planar structure of the color filter substrate 10 on its entire surface. In the heating mode, the first graphene heating layer 41 applies a heating signal to heat the liquid crystal layer 30; in the screen-off color-changing mode, the first graphene heating layer 41 applies a corresponding light-emitting signal to display the corresponding color. Thus, in the heating mode, the color filter substrate 10 can be heated and the heat can be transferred to the liquid crystal layer 30 to achieve heating of the liquid crystal layer 30; and in the screen-off color-changing mode, the first graphene heating layer 41 applies a corresponding light-emitting signal so that the liquid crystal display panel can present the corresponding color.

[0043] In one embodiment, a first polarizer 51 is provided on a side of the color filter substrate 10 away from the liquid crystal layer 30, and the first graphene heating layer 41 is provided between the color filter substrate 10 and the first polarizer 51, so that the first polarizer 51 can well protect the first graphene heating layer 41. Optionally, a second polarizer 52 is provided on a side of the array substrate 20 away from the liquid crystal layer 30, and the light transmission axis of the first polarizer 51 and the light transmission axis of the second polarizer 52 are perpendicular to each other.

[0044] In this embodiment, the graphene heating layer 40 is a thin film structure made of graphene material, that is, the first heating layer 41 can be made of graphene material. Since the graphene film layer is almost completely transparent and only absorbs 2.3% of light, that is, the transmittance is 97.7%, it will basically not affect the normal display of the liquid crystal display panel. Figure 5 FIG. 1 is a schematic diagram of the heat generation simulation of the graphene film layer in the first embodiment of the present invention. Figure 5 As shown, the heating principle of graphene is mainly based on its unique physical and chemical properties. It generates heat through the movement and friction of carbon atom groups under the action of an electric field, and releases it in the form of far-infrared rays. Graphene is a two-dimensional material composed of a single layer of carbon atoms tightly arranged, with extremely high electrical and thermal conductivity. Graphene heating principle Under the action of an electric field, the carbon atom groups in the heating body undergo "Brownian motion", and violent friction and collision occur between the carbon atoms. The generated heat energy is transmitted to the outside in the form of far-infrared radiation, and the total conversion rate of effective electric heat energy reaches more than 99%. These characteristics of graphene enable it to perform well in heating applications. It not only has high heating efficiency, but also uniform and stable heating. Graphene is a new material in which carbon atoms connected by sp hybridization are tightly stacked into a single-layer two-dimensional honeycomb lattice structure. The temperature rise rate of the graphene heating element ( Figure 5 The solid curve) is higher than the temperature rise rate of the resistance wire heating element ( Figure 5 When heated for 1 min, the sample temperature of the graphene heating element can rise from 25°C to about 80°C.

[0045] Figure 6 FIG. 1 is a schematic diagram of the light emission simulation of the graphene film layer in the first embodiment of the present invention. Figure 6As shown, when the graphene film layer is applied with voltages of different magnitudes, it can emit light characteristics of different colors, so that the corresponding electrical signal can be applied to the first graphene heating layer 41 to emit light of corresponding colors, realizing the color-changing display of the screen. Among them, the light-emitting material is prepared using the interface of two different forms of graphene, and the partially reduced graphene oxide at the interface between graphene oxide (GO) and reduced graphene oxide (rGO) has a series of discrete energy levels, which can emit light of different colors when different voltages are applied, almost covering the entire visible spectrum. Among them, the graphene film layer will also emit less heat when emitting light, but the electrical energy is mainly converted into light energy; and when the graphene film layer is heating, the electrical energy is basically converted into thermal energy. The voltage applied to the graphene film layer when emitting light and heating is different, and the voltage applied when heating is much greater than the voltage applied when emitting light.

[0046] Figure 3 This is one of the circuit structure diagrams of the liquid crystal display device in the first embodiment of the present invention. Figure 4 FIG. 2 is a second schematic diagram of the circuit structure of the liquid crystal display device in the first embodiment of the present invention. Figure 3 and Figure 4 As shown, in this embodiment, the liquid crystal display panel includes a first circuit board 71 and a second circuit board 72. The first circuit board 71 is electrically connected to the array substrate 20 to apply a corresponding electrical signal to the array substrate 20; the second circuit board 72 is electrically connected to the color filter substrate 10 to apply a corresponding electrical signal to the first graphene heating layer 41. Figure 3 As shown, the first circuit board 71 is a PCBA (Printed Circuit Board Assembly), and the second circuit board 72 is an FPC (Flexible Printed Circuit). The second circuit board 72 can be bound to the first circuit board 71, so that the corresponding electrical signals are applied to the array substrate 20 and the second circuit board 72 through the first circuit board 71. Figure 4 As shown, of course, the first circuit board 71 and the second circuit board 72 may both be PCBAs (Printed Circuit Board Assembly), that is, the first circuit board 71 and the second circuit board 72 are respectively bound to the control circuit.

[0047] Figure 7 Schematic diagram of the planar structure of the color filter substrate in the first embodiment of the present invention. Figure 7 As shown, a black matrix 11 and a color resist layer 12 are provided on the side of the color film substrate 10 facing the liquid crystal layer 30. The black matrix 11 is used to separate the multiple color resist layers 12 from each other. The color resist layer 12 includes color group materials of red (R), green (G), and blue (B) to correspond to the red, green, and blue pixels respectively.

[0048] Figure 8 FIG. 1 is a schematic diagram of the planar structure of the array substrate in the first embodiment of the present invention. Figure 8 As shown, a plurality of second pixel units P2 are formed by a plurality of second scan lines 201 and a plurality of second data lines 202 which are insulated and crossed from each other on one side of the array substrate 20 facing the liquid crystal layer 30. A pixel electrode 22 and a second thin film transistor 203 are provided in each second pixel unit P2, and the pixel electrode 22 is electrically connected to a second data line 202 adjacent to the second thin film transistor 203 through the second thin film transistor 203. The second thin film transistor 203 includes a second gate, a second active layer, a second drain and a second source, the second gate is located in the same layer as the second scan line 201 and is electrically connected, the second gate is separated from the second active layer by an insulating layer, the second source is electrically connected to the second data line 202, and the second drain is electrically connected to the pixel electrode 22 through a contact hole.

[0049] In this embodiment, a common electrode 21 is further provided on the side of the array substrate 20 facing the liquid crystal layer 30. The common electrode 21 and the pixel electrode 22 are located in different layers and insulated and isolated by an insulating layer. The common electrode 21 can be located above or below the pixel electrode 22 ( Figure 1 As shown in the figure, the common electrode 21 is located below the pixel electrode 22). Preferably, the common electrode 21 is a planar electrode arranged on the entire surface, and the pixel electrode 22 is a slit electrode having a plurality of electrode strips in each pixel unit to form a fringe field switching mode (Fringe Field Switching, FFS). Of course, in other embodiments, the pixel electrode 22 and the common electrode 21 may be located on the same layer, but the two are insulated and isolated from each other, and the pixel electrode 22 and the common electrode 21 may each include a plurality of electrode strips, and the electrode strips of the pixel electrode 22 and the electrode strips of the common electrode 21 are alternately arranged to form an in-plane switching mode (In-Plane Switching, IPS). Alternatively, in other embodiments, the array substrate 20 is provided with a pixel electrode 22 on the side facing the liquid crystal layer 30, and the color film substrate 10 is provided with a common electrode 21 on the side facing the liquid crystal layer 30 to form a TN mode or a VA mode. As for other introductions to the TN mode and the VA mode, please refer to the prior art, which will not be repeated here.

[0050] The color filter substrate 10 and the array substrate 20 may be made of glass, acrylic acid, polycarbonate, etc. The common electrode 21 and the pixel electrode 22 may be made of indium tin oxide (ITO) or indium zinc oxide (IZO), etc.

[0051] The present application also provides a liquid crystal display device, including a backlight module 60 and the liquid crystal display panel as described above, wherein the liquid crystal display panel is arranged on the light emitting side of the backlight module 60, so that the backlight module 60 can provide a backlight source for the liquid crystal display panel.

[0052] [Example 2] Fig. 9 It is a schematic diagram of the structure of the liquid crystal display device in the dark state in the second embodiment of the present invention. Fig.10 It is a schematic structural diagram of the liquid crystal display device in the bright state in the second embodiment of the present invention. Fig.11 Schematic diagram of the circuit structure of the liquid crystal display device in the second embodiment of the present invention. Figures 9 to 11 As shown, the liquid crystal display panel and the liquid crystal display device provided in the second embodiment of the present invention are different from those provided in the first embodiment ( Figures 1 to 8 ) are substantially the same as the liquid crystal display panel and the liquid crystal display device, except that: In this embodiment, a first polarizer 51 and a cover plate 80 are provided on the side of the color filter substrate 10 away from the liquid crystal layer 30, and the first graphene heating layer 41 is provided between the first polarizer 51 and the cover plate 80. The first graphene heating layer 41 can cover the surface of the cover plate 80 facing the first polarizer 51, and since the area of ​​the cover plate 80 is usually larger than that of the color filter substrate 10, it is convenient to bind the first graphene heating layer 41 to the second circuit board 72.

[0053] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of the first embodiment and will not be described in detail here.

[0054] [Example 3] Fig.12 It is a schematic diagram of the structure of the liquid crystal display device in the dark state in the third embodiment of the present invention. Fig.13 It is a schematic diagram of the structure of the liquid crystal display device in the bright state in the third embodiment of the present invention. Fig.14 Schematic diagram of the circuit structure of the liquid crystal display device in the third embodiment of the present invention. Fig.12 and Fig.14 As shown, the liquid crystal display panel and the liquid crystal display device provided in the third embodiment of the present invention are different from those in the first embodiment ( Figures 1 to 8 )、Example 2 ( Figures 9 to 11 ) are substantially the same as the liquid crystal display panel and the liquid crystal display device, except that: In this embodiment, the graphene heating layer 40 includes a second graphene heating layer 42, the second graphene heating layer 42 is arranged on the array substrate 20, the first graphene heating layer 41 is arranged on the color film substrate 10, and the second graphene heating layer 42 is arranged on the array substrate 20. In the heating mode, the first graphene heating layer 41 and the second graphene heating layer 42 both apply heating signals to heat the liquid crystal layer 30, and the liquid crystal display panel is heated by the double graphene heating layers, so as to increase the heating rate of the liquid crystal layer 30. Since the array substrate 20 is the side away from the external environment, in the off-screen color-changing mode, only the corresponding light-emitting signal needs to be applied to the first graphene heating layer 41 to display the corresponding color, and the second graphene heating layer 42 does not apply an electrical signal.

[0055] Optionally, a second polarizer 52 is provided on the side of the array substrate 20 away from the liquid crystal layer 30, and the second graphene heating layer 42 is provided between the array substrate 20 and the second polarizer 52, so that the second polarizer 52 can play a good protective role on the second graphene heating layer 42. The second graphene heating layer 42 is a graphene film layer, that is, the first graphene heating layer 41 can be made of graphene material.

[0056] like Fig.14 As shown, the liquid crystal display panel includes a third circuit board 73, and the third circuit board 73 is electrically connected to the second graphene heating layer 42 to apply a corresponding electrical signal to the second graphene heating layer 42. Fig.14 As shown, the first circuit board 71 is a PCBA (Printed Circuit Board Assembly), the second circuit board 72 and the third circuit board 73 are both FPC (Flexible Printed Circuit), and the second circuit board 72 and the third circuit board 73 can be bound to the first circuit board 71, so that the corresponding electrical signals are applied to the array substrate 20, the second circuit board 72 and the third circuit board 73 through the first circuit board 71. Of course, in other embodiments, the first circuit board 71, the second circuit board 72 and the third circuit board 73 can also be PCBA (Printed Circuit Board Assembly), that is, the first circuit board 71, the second circuit board 72 and the third circuit board 73 are respectively bound to the control circuit.

[0057] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1 and Embodiment 2, and will not be described in detail here.

[0058] [Example 4] Fig.15It is a schematic diagram of the structure of the liquid crystal display device in the fourth embodiment of the present invention in the dark state. Fig.16 It is a schematic diagram of the structure of the liquid crystal display device in the bright state in the fourth embodiment of the present invention. Fig.17 Schematic diagram of the circuit structure of the liquid crystal display device in the fourth embodiment of the present invention. Figures 15 to 17 As shown, the liquid crystal display panel and the liquid crystal display device provided by the fourth embodiment of the present invention are different from those provided by the first embodiment ( Figures 1 to 8 )、Example 2 ( Figures 9 to 11 )、Example 3 ( Figure 12 to Figure 14 ) are substantially the same as the liquid crystal display panel and the liquid crystal display device, except that: In this embodiment, the first graphene heating layer 41 is disposed on the side of the color filter substrate 10 facing the liquid crystal layer 30, and the second graphene heating layer 42 is disposed on the side of the array substrate 20 facing the liquid crystal layer 30. Thus, the first graphene heating layer 41 and the second graphene heating layer 42 can be closer to the liquid crystal layer 30, so as to quickly heat the liquid crystal layer 30. Of course, in other embodiments, only the first graphene heating layer 41 can be disposed on the side of the color filter substrate 10 facing the liquid crystal layer 30; or only the second graphene heating layer 42 can be disposed on the side of the array substrate 20 facing the liquid crystal layer 30.

[0059] Further, such as Fig.16 As shown, the liquid crystal display panel includes a first circuit board 71 and a conductive column 74, one end of the conductive column 74 is electrically connected to the first graphene heating layer 41, and the other end is electrically connected to the first circuit board 71, that is, the first graphene heating layer 41 can be connected to the first circuit board 71 by AU dotting or silver glue dotting. Thus, the first circuit board 71 applies corresponding electrical signals to the first graphene heating layer 41, the second graphene heating layer 42 and the array substrate 20, so there is no need to set the second circuit board 72 and the third circuit board 73, so as to simplify the circuit structure of the liquid crystal display panel.

[0060] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1, Embodiment 2, and Embodiment 3, and will not be described in detail here.

[0061] [Example 5] Fig.18 Schematic diagram of the structure of the liquid crystal display device in the dark state in the fifth embodiment of the present invention. Fig.18 As shown, the liquid crystal display panel and the liquid crystal display device provided by the fourth embodiment of the present invention are different from those provided by the first embodiment ( Figures 1 to 8 )、Example 2 ( Figures 9 to 11 )、Example 3 ( Figure 12 to Figure 14 )、Example 3 ( Figures 15 to 17 ) are substantially the same as the liquid crystal display panel and the liquid crystal display device, except that: The graphene heating layer 40 is a grid structure and corresponds to the black matrix 11 on the color filter substrate 10. In this embodiment, the first graphene heating layer 41 and the second graphene heating layer 42 are both grid structures and correspond to the black matrix 11 on the color filter substrate 10. Although the graphene heating layer 40 is a transparent material, the light transmittance can only reach 97.7%, and it is impossible to achieve 100% transparency. Therefore, the graphene heating layer 40 will still absorb part of the light, so that the first graphene heating layer 41 and the second graphene heating layer 42 are both set to a grid structure corresponding to the black matrix 11 on the color filter substrate 10, which can avoid affecting the light transmittance.

[0062] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4, and will not be described in detail here.

[0063] [Example 6] Fig.19 It is a schematic diagram of the structure of the liquid crystal display device in the dark state in the sixth embodiment of the present invention. Fig. 20 It is a schematic diagram of the structure of the liquid crystal display device in the bright state in the sixth embodiment of the present invention. Fig.21 Schematic diagram of the circuit plan structure of the color film substrate in the sixth embodiment of the present invention. Figures 19 to 21 As shown, the liquid crystal display panel and the liquid crystal display device provided in the sixth embodiment of the present invention are different from those in the first embodiment ( Figures 1 to 8 )、Example 2 ( Figures 9 to 11 )、Example 3 ( Figure 12 to Figure 14 ), Embodiment 4 ( Figures 15 to 17 ) are substantially the same as the liquid crystal display panel and the liquid crystal display device, except that: In this embodiment, the first graphene heating layer 41 includes a plurality of mutually independent graphene blocks 411, and the plurality of graphene blocks 411 are distributed in an array, and each graphene block 411 corresponds to a first pixel unit P1. Among them, the first pixel unit P1 can correspond to the second pixel unit P2 one by one, one first pixel unit P1 can correspond to a plurality of second pixel units P2, or a plurality of first pixel units P1 can correspond to a second pixel unit P2.

[0064] In the heating mode, all graphene blocks 411 apply heating signals to heat the liquid crystal layer 30; in the off-screen display mode, each graphene block 411 applies a corresponding light-emitting signal to display a corresponding pattern, such as a wood grain pattern, so that the liquid crystal display device is integrated with the wood grain of the car's center console to achieve hidden display.

[0065] In this embodiment, Fig. 20As shown, a plurality of first scan lines 101, a plurality of first data lines 102, a plurality of first thin film transistors 103 and a plurality of common wirings 104 are provided on the color film substrate 10. The plurality of first scan lines 101 and the plurality of first data lines 102 are insulated from each other and cross to define a plurality of first pixel units P1. A graphene block 411 and a first thin film transistor 103 are provided in each first pixel unit P1. One end of each graphene block 411 is electrically connected to the first scan line 101 and the first data line 102 adjacent to the first thin film transistor 103 through the corresponding first thin film transistor 103, and the other end of each graphene block 411 is electrically connected to the corresponding common wiring 104. The first data line 102 is used to apply a positive voltage to the corresponding graphene block 411, and the common wiring 104 is used to apply a negative voltage to the graphene block 411, so as to control each graphene block 411 to generate heat or emit light. Among them, the first thin film transistor 103 includes a first gate, a first active layer, a first drain and a first source. The first gate and the first scan line 101 are located in the same layer and are electrically connected. The first gate and the first active layer are separated by an insulating layer. The first source is electrically connected to the first data line 102, and the first drain is electrically connected to the graphene block 411 through a contact hole.

[0066] In other embodiments, the first graphene heating layer 41, the first scan line 101, the first data line 102, the first thin film transistor 103 and the common wiring 104 are all arranged on the side of the black matrix 11 facing the liquid crystal layer 30. In the projection direction of the array substrate 20, the first scan line 101 overlaps with the second scan line 201, the first data line 102 overlaps with the second data line 202, and the first thin film transistor 103 overlaps with the second thin film transistor 203, so that the black matrix 11 can block the first scan line 101, the first data line 102, the first thin film transistor 103 and the common wiring 104 to avoid metal reflection and affect the display effect of the picture.

[0067] Figures 22a to 22d FIG. 1 is a schematic diagram of the manufacturing process of the first graphene heating layer on the color film substrate in the sixth embodiment of the present invention. Figures 22a to 22d As shown, the manufacturing method of the first graphene heating layer 41 in this embodiment includes: like Fig.22a As shown, a first graphene heating layer 41 and a photoresist layer 1 are covered on the surface of the color filter substrate 10; like Figure 22b As shown, the photoresist layer 1 is exposed and developed by using a patterned mask as a shield, so that the photoresist layer 1 becomes a patterned structure; like Fig.22cAs shown, the first graphene heating layer 41 is etched with the patterned photoresist layer 1 as a shield, so that the first graphene heating layer 41 is transformed into a plurality of graphene blocks 411, and a plurality of graphene blocks 411 are arranged on the entire surface of the color filter substrate 10; like Fig.22d As shown, the photoresist layer 1 is then peeled off and a flat layer 14 is covered on the surface of the color filter substrate 10 to cover the graphene block 411, so that the surface of the color filter substrate 10 is smoother. The surface of the color filter substrate 10 is also provided with a first scan line 101, a first data line 102, a first thin film transistor 103 and a common wiring 104. The manufacturing methods of the first scan line 101, the first data line 102, the first thin film transistor 103 and the common wiring 104 can refer to the prior art.

[0068] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4, and will not be described in detail here.

[0069] [Example 6] Fig.23 It is a schematic structural diagram of the liquid crystal display device in the dark state in the seventh embodiment of the present invention. Fig.24 FIG. 1 is a schematic diagram of the circuit plan structure of the color film substrate in the seventh embodiment of the present invention. Figure 23 to Figure 24 As shown, the liquid crystal display panel and the liquid crystal display device provided in the sixth embodiment of the present invention are different from those in the first embodiment ( Figures 1 to 8 )、Example 2 ( Figures 9 to 11 )、Example 3 ( Figure 12 to Figure 14 ), Embodiment 4 ( Figures 15 to 17 ) are substantially the same as the liquid crystal display panel and the liquid crystal display device, except that: In this embodiment, the first graphene heating layer 41 includes a plurality of mutually independent graphene blocks 411, and the plurality of graphene blocks 411 are distributed in an array, and each graphene block 411 corresponds to a first pixel unit P1. Among them, the first pixel unit P1 can correspond to the second pixel unit P2 one by one, one first pixel unit P1 can correspond to a plurality of second pixel units P2, or a plurality of first pixel units P1 can correspond to a second pixel unit P2.

[0070] In the heating mode, all graphene blocks 411 apply heating signals to heat the liquid crystal layer 30; in the off-screen display mode, each graphene block 411 applies a corresponding light-emitting signal to display a corresponding pattern, such as a wood grain pattern, so that the liquid crystal display device is integrated with the wood grain of the car's center console to achieve hidden display.

[0071] In this embodiment, Fig.23 and Fig.24 As shown, the color film substrate 10 is provided with a plurality of first scan lines 101, a plurality of first data lines 102, a plurality of first thin film transistors 103, a plurality of electrode blocks 412 and a common electrode layer 413. The graphene blocks 411 are arranged between the electrode blocks 412 and the common electrode layer 413 and correspond to the electrode blocks 412 one by one. Each electrode block 412 is electrically connected to the first scan line 101 and the first data line 102 adjacent to the first thin film transistor 103 through the corresponding first thin film transistor 103. The first data line 102 is used to apply a positive voltage to the corresponding graphene block 411 through the electrode block 412, and the common electrode layer 413 is used to apply a negative voltage to the graphene block 411, thereby controlling each graphene block 411 to generate heat or emit light. By applying an electrical signal to the graphene block 411 through the electrode block 412 and the common electrode layer 413, the heating effect and the luminous effect of the graphene block 411 can be increased. The first thin film transistor 103 includes a first gate, a first active layer, a first drain and a first source. The first gate is located in the same layer as the first scan line 101 and is electrically connected. The first gate is isolated from the first active layer by an insulating layer. The first source is electrically connected to the first data line 102. The first drain is electrically connected to the graphene block 411 through a contact hole. The common electrode layer 413 can be a planar electrode arranged on the entire surface, or a block electrode corresponding to the graphene block 411. All the block electrodes are connected together by wires.

[0072] In other embodiments, the first scan line 101, the first data line 102, the first thin film transistor 103, the graphene block 411, the electrode block 412 and the common electrode layer 413 are all arranged on the side of the black matrix 11 facing the liquid crystal layer 30. In the projection direction of the array substrate 20, the first scan line 101 overlaps with the second scan line 201, the first data line 102 overlaps with the second data line 202, and the first thin film transistor 103 overlaps with the second thin film transistor 203, so that the black matrix 11 can block the first scan line 101, the first data line 102 and the first thin film transistor 103 to avoid metal reflection and affect the display effect of the picture.

[0073] It should be understood by those skilled in the art that the rest of the structure and working principle of this embodiment are the same as those of Embodiment 1, Embodiment 2, Embodiment 3, and Embodiment 4, and will not be described in detail here.

[0074] In this document, the directional words such as up, down, left, right, front, and back are defined by the positions of the structures in the drawings and the positions of the structures relative to each other, just for the sake of clarity and convenience in expressing the technical solution. It should be understood that the use of the directional words should not limit the scope of protection claimed in this application. It should also be understood that the terms "first" and "second" used in this document are only used to distinguish names and are not used to limit quantity and order.

[0075] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to the technical contents disclosed above without departing from the scope of the technical solution of the present invention, which are equivalent embodiments of equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A liquid crystal display panel, characterized in that: The invention comprises a graphene heating layer (40), a color film substrate (10), an array substrate (20) arranged opposite to the color film substrate (10), and a liquid crystal layer (30) located between the color film substrate (10) and the array substrate (20), wherein the graphene heating layer (40) comprises a first graphene heating layer (41), and the first graphene heating layer (41) is arranged on the color film substrate (10); In the heating mode, the first graphene heating layer (41) applies a heating signal to heat the liquid crystal layer (30); in the screen-off color-changing mode, the first graphene heating layer (41) applies a corresponding light-emitting signal to display a corresponding color.

2. The liquid crystal display panel according to claim 1, characterized in that: A first polarizer (51) is provided on a side of the color film substrate (10) away from the liquid crystal layer (30), and the first graphene heating layer (41) is provided between the color film substrate (10) and the first polarizer (51); Alternatively, a first polarizer (51) and a cover plate (80) are provided on a side of the color film substrate (10) away from the liquid crystal layer (30), and the first graphene heating layer (41) is provided between the first polarizer (51) and the cover plate (80).

3. The liquid crystal display panel according to claim 1, characterized in that: The first heating layer (41) is arranged on a side of the color film substrate (10) facing the liquid crystal layer (30).

4. The liquid crystal display panel according to claim 1, characterized in that: The first graphene heating layer (41) comprises a plurality of mutually independent graphene blocks (411), and the plurality of graphene blocks (411) are distributed in an array; In the heating mode, all the graphene blocks (411) apply a heating signal to heat the liquid crystal layer (30); in the off-screen display mode, each of the graphene blocks (411) applies a corresponding light-emitting signal to display a corresponding pattern.

5. The liquid crystal display panel according to claim 4, characterized in that: The color film substrate (10) is provided with a plurality of first scanning lines (101), a plurality of first data lines (102), a plurality of first thin film transistors (103) and a plurality of common wirings (104); one end of each of the graphene blocks (411) is electrically connected to the first scanning line (101) and the first data line (102) adjacent to the first thin film transistor (103) through the corresponding first thin film transistor (103); and the other end of each of the graphene blocks (411) is electrically connected to the corresponding common wiring (104).

6. The liquid crystal display panel according to claim 4, characterized in that: The color film substrate (10) is provided with a plurality of first scanning lines (101), a plurality of first data lines (102), a plurality of first thin film transistors (103), a plurality of electrode blocks (412) and a common electrode layer (413); the graphene blocks (411) are arranged between the electrode blocks (412) and the common electrode layer (413) and correspond one-to-one to the electrode blocks (412); each of the electrode blocks (412) is electrically connected to the first scanning line (101) and the first data line (102) adjacent to the first thin film transistor (103) through the corresponding first thin film transistor (103).

7. The liquid crystal display panel according to claim 1, characterized in that: The graphene heating layer (40) comprises a second graphene heating layer (42), and the second graphene heating layer (42) is arranged on the array substrate (20); In the heating mode, the second graphene heating layer (42) applies a heating signal to heat the liquid crystal layer (30).

8. The liquid crystal display panel according to claim 7, characterized in that: A second polarizer (52) is provided on a side of the array substrate (20) away from the liquid crystal layer (30), and the second graphene heating layer (42) is provided between the array substrate (20) and the second polarizer (52); Alternatively, the second graphene heating layer (42) is arranged on a side of the array substrate (20) facing the liquid crystal layer (30).

9. The liquid crystal display panel according to claim 1, characterized in that: The graphene heating layer (40) is a grid structure and corresponds to the black matrix (11) on the color film substrate (10).

10. A liquid crystal display device, characterized in that: Comprising a liquid crystal display panel as described in any one of claims 1 to 9.

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