Low-power-consumption liquid crystal display device

Abstract

The utility model relates to a low-power-consumption liquid crystal display device which is characterized by comprising a first liquid crystal box and a second liquid crystal box which are overlapped with each other, the first liquid crystal box comprises a first liquid crystal layer and a TFT array, and the TFT array is used for driving the first liquid crystal layer to form an active pixel array; the second liquid crystal box comprises a second liquid crystal layer and a pattern electrode; the pattern electrode is used for driving the second liquid crystal layer to form a display pattern; a first polaroid is arranged on the side face, away from the second liquid crystal box, of the first liquid crystal box. A second polaroid is arranged on the side face, away from the first liquid crystal box, of the second liquid crystal box. The low-power-consumption liquid crystal display device can present dot matrix images or simple patterns during display, the power consumption of the low-power-consumption liquid crystal display device in a standby state can be effectively reduced, and the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of display, in particular to a low-power consumption liquid crystal display device. Background Art

[0002] With the advancement of technology and the improvement of consumers' requirements for quality of life, modern home appliances are developing in the direction of intelligence and high-end. Under this trend, more and more high-end home appliances, such as ovens, microwave ovens, washing machines and refrigerators, have begun to use large-size color and high-resolution thin-film transistor displays (hereinafter referred to as TFT displays) as information display interfaces. TFT displays, with their excellent color expression and clarity, have greatly enriched the user's interactive experience, making the operation of home appliances more intuitive and convenient, and the information display more colorful.

[0003] However, although TFT displays have brought significant visual upgrades to home appliances, their power consumption during the driving process is also relatively large. This is mainly because the working principle of TFT displays determines that they need to consume a certain amount of electrical energy to activate their TFT devices when displaying images, so as to display and update the images. Especially under high resolution and large size conditions, the power consumption of TFT displays is more significant.

[0004] In addition, these high-end home appliances are often in standby mode most of the time in daily life. In standby mode, home appliances usually only need to partially display some simple patterns or information, such as time, temperature, working mode, etc., to provide basic status indications. However, traditional TFT displays still need to be powered continuously in standby mode to maintain the normal operation of their internal circuits and display modules. This results in relatively high power consumption of home appliances even in standby mode, which does not meet the current society's pursuit of energy conservation, emission reduction and green environmental protection.

[0005] Therefore, how to reduce the standby power consumption of high-end home appliances when using TFT displays has become an urgent problem to be solved. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a low-power liquid crystal display device, which can present a dot matrix image or a simple pattern when displaying, and can effectively reduce its power consumption in the standby state, so as to achieve the purpose of energy saving and emission reduction. The technical solution adopted is as follows:

[0007] A low-power liquid crystal display device, characterized in that: it includes a first liquid crystal box and a second liquid crystal box superimposed on each other; the first liquid crystal box includes a first liquid crystal layer and a TFT array, the TFT array is used to drive the first liquid crystal layer to form an active pixel array; the second liquid crystal box includes a second liquid crystal layer and a pattern electrode, the pattern electrode is used to drive the second liquid crystal layer to form a display pattern; a first polarizer is arranged on the side of the first liquid crystal box away from the second liquid crystal box; a second polarizer is arranged on the side of the second liquid crystal box away from the first liquid crystal box.

[0008] The display pattern is generally a pattern or a pen segment of a pre-designed shape. The display surface area where the active pixel array is located is defined as a display area. The display pattern is within the display area, and the area where it is located can be defined as a pattern area, while the area where the pattern is not displayed can be defined as a non-pattern area. The first polarizer and the second polarizer cover the display area.

[0009] In the above-mentioned low-power liquid crystal display device, the first liquid crystal layer and the second liquid crystal layer constitute an overlapping liquid crystal layer. Changes in the arrangement of liquid crystal molecules in any of the first liquid crystal layer and the second liquid crystal layer can change the birefringence of the overlapping liquid crystal layer, causing the transmittance of the corresponding area (pixel or pattern area) to change, ultimately presenting the displayed dot matrix image or simple pattern.

[0010] As a preferred solution of the utility model, the low-power liquid crystal display device also includes a first driving circuit for providing active driving for the first liquid crystal layer and a second driving circuit for providing passive driving for the second liquid crystal layer, the first driving circuit is electrically connected to the TFT array of the first liquid crystal box, and the second driving circuit is electrically connected to the pattern electrode of the second liquid crystal box.

[0011] When this low-power liquid crystal display device is applied to household appliances, if the household appliances need human-computer interaction, the TFT array of the first liquid crystal box can be driven by the first driving circuit, the first driving circuit is connected to the TFT array, the image information is input to the TFT array, and then the first liquid crystal layer is provided with a high-resolution active drive, thereby changing the birefringence of the overlapping liquid crystal layer at the pixel position, so that the liquid crystal display device can present a high-definition dot matrix image to meet the needs of human-computer interaction. When the household appliance is in standby mode, the first driving circuit can be turned off, and the pattern electrode of the second liquid crystal box can be driven by the second driving circuit, thereby changing the birefringence of the overlapping liquid crystal layer at the pattern electrode, so that the liquid crystal display device displays relatively simple pattern information. The second driving circuit is a passive drive with very low power consumption, which can achieve the purpose of standby power saving.

[0012] The first liquid crystal box and the second liquid crystal box can form a fixed superimposed structure by means of their external fixed structure or frame bonding. As a preferred embodiment of the utility model, the first liquid crystal box and the second liquid crystal box are fully bonded by a transparent adhesive layer. Specifically, the transparent adhesive layer adopts OCA adhesive or an adhesive layer without birefringence. The transparent adhesive layer is bonded at least in the entire display area, thereby eliminating the air layer in the display area and preventing the air layer from affecting the display in the display area.

[0013] The first polarizer and the second polarizer can be general polarizers or polarizers containing certain optical compensation. The polarization axis angles of the first polarizer and the second polarizer, and the optical compensation design can be coordinated with the first liquid crystal layer and the second liquid crystal layer to achieve the desired display effect.

[0014] Generally, the first liquid crystal cell and the second liquid crystal cell may be liquid crystal cells used in existing TFT liquid crystal displays (such as color TFT liquid crystal displays).

[0015] As a preferred solution of the utility model, the first liquid crystal box also includes a first transparent substrate and a second transparent substrate, and the first liquid crystal layer is sandwiched between the first transparent substrate and the second transparent substrate; the TFT array is arranged on the side of the first transparent substrate or the second transparent substrate close to the first liquid crystal layer; the second liquid crystal box also includes a third transparent substrate and a fourth transparent substrate, and the second liquid crystal layer is sandwiched between the third transparent substrate and the fourth transparent substrate, and the pattern electrode is formed by overlapping transparent electrodes (such as ITO electrodes) respectively arranged on the third transparent substrate and the fourth transparent substrate. The resolution of the TFT array is generally above 300 lines, and its TFT device can be a variety of thin film semiconductor devices such as α-Si, LTPS, IGZO, etc. The TFT array generally also includes a driving circuit (such as a scanning line, a data line) and a pixel electrode (such as an ITO electrode). The pattern electrode can be connected to the second driving circuit through a transparent lead, and it can change the arrangement of the liquid crystal in the pattern area when a driving voltage (generally passive driving) is applied. In the pattern area, the second liquid crystal layer remains in a natural state (or close to a natural state) when no driving voltage (ON state driving voltage) is applied, and in the non-pattern area, the second liquid crystal layer only maintains a natural state.

[0016] In order to achieve the desired display mode (mainly considering the display mode in the power saving state), the first liquid crystal layer and the second liquid crystal layer can adopt multiple display modes such as TN, IPS, VA, etc. TN is a twisted nematic mode, IPS is a coplanar switching mode, and VA is a vertical alignment mode. To achieve the above display mode, as a further preferred embodiment of the utility model, the first transparent substrate and the second transparent substrate are respectively provided with a first alignment layer and a second alignment layer on the side close to the first liquid crystal layer, and the third transparent substrate and the fourth transparent substrate are respectively provided with a third alignment layer and a fourth alignment layer on the side close to the second liquid crystal layer. The first alignment layer, the second alignment layer, the third alignment layer, and the fourth alignment layer can adopt a horizontal alignment layer or a vertical alignment layer, and are achieved by directional rubbing of the alignment layer at a certain orientation angle.

[0017] Table 1 below lists the designs adopted by the above-mentioned low-power LCD display device in display modes of various power-saving states;

[0018] Table 1:

[0019]

[0020] Wherein, P1 and P2 are polarization axis angles of the first polarizer and the second polarizer respectively, and θ1, θ2, θ3, and θ4 are directional rubbing angles of the first alignment layer, the second alignment layer, the third alignment layer, and the fourth alignment layer respectively.

[0021] As a further preferred embodiment of the present invention, the first liquid crystal layer and the second liquid crystal layer are both in twisted nematic mode (TN), and the liquid crystal twisting directions of the first liquid crystal layer and the second liquid crystal layer are opposite (see display mode 01 in Table 1). Thus, the first liquid crystal layer and the second liquid crystal layer can form a mutual viewing angle compensation and dispersion compensation, so that the viewing angle characteristics of the liquid crystal display device are better and the color cast is smaller.

[0022] As a further preferred scheme of the present invention, the polarization axis angle P1 of the first polarizer is 45°, the polarization axis angle P2 of the second polarizer is 45°, the directional rubbing angle θ1 of the first alignment layer is 45°, the directional rubbing angle θ2 of the second alignment layer is -45°, the directional rubbing angle θ3 of the third alignment layer is -45°, and the directional rubbing angle θ4 of the fourth alignment layer is 45°.

[0023] As another further preferred scheme of the present invention, the first liquid crystal layer is in coplanar switching mode, the second liquid crystal layer is in twisted nematic mode (TN), the polarization axis angle P1 of the first polarizer is 0°, the polarization axis angle P2 of the second polarizer is 0°, the directional rubbing angle θ1 of the first alignment layer is 0°, the directional rubbing angle θ2 of the second alignment layer is 0°, the directional rubbing angle θ3 of the third alignment layer is 0°, and the directional rubbing angle θ4 of the fourth alignment layer is 90°.

[0024] As another further preferred solution of the utility model, the second liquid crystal layer is in vertical alignment mode (VA), the third alignment layer and the fourth alignment layer are vertical alignment layers, and the second liquid crystal layer is a negative liquid crystal (dielectric anisotropy is negative). Thus, the second liquid crystal layer is vertically arranged in a natural state, and at least at a positive viewing angle, the second liquid crystal layer does not affect the polarization state of the light, and the polarization state of the superimposed liquid crystal layer is only determined by the first liquid crystal layer, and its optical principle is simpler and easier to understand.

[0025] In order to make the viewing angle of the pattern area in the ON state (transmitting state) more uniform, as a further preferred solution of the utility model, the second liquid crystal layer is a multi-domain vertical alignment mode (multi-domain VA); the polarization axis angle P1 of the first polarizer is 0°, the polarization axis angle P2 of the second polarizer is 90°, the directional rubbing angle θ1 of the first alignment layer is 0°, and the directional rubbing angle θ2 of the second alignment layer is 0°. Referring to display mode 04 in Table 1, the multi-domain vertical alignment mode (multi-domain VA) does not require directional rubbing, but uses a pattern electrode with micro-grooves for orientation. Its structure and principle can refer to the Chinese invention patent specification with publication number CN101477280A and patent name A passively driven liquid crystal display.

[0026] When the second liquid crystal layer is in vertical alignment mode (VA), as a further preferred solution of the present invention, the low power consumption liquid crystal display device further includes C - -plate compensation film, C - The compensation film is disposed on the inner side of the first polarizer or the second polarizer or between the first liquid crystal cell and the second liquid crystal cell. - The -plate compensation film is used to compensate for the optical path difference of the second liquid crystal layer at an inclined viewing angle. Its compensation value is generally equivalent to that of the second liquid crystal layer. As a result, the second liquid crystal layer will not cause light leakage at an inclined viewing angle, ensuring a black background color in the non-display area and the OFF state display area at an inclined viewing angle.

[0027] As a preferred solution of the utility model, the low-power consumption liquid crystal display device further comprises a backlight source, which is arranged on a side of the first liquid crystal cell away from the second liquid crystal cell. The backlight source is used to provide illumination for the liquid crystal display device.

[0028] In this specification, the inside and outside refer to: the side close to the first liquid crystal cell and the second liquid crystal cell is the inside, and the side away from the first liquid crystal cell and the second liquid crystal cell is the outside.

[0029] Compared with the prior art, the utility model has the following advantages:

[0030] The first liquid crystal layer and the second liquid crystal layer in this low-power liquid crystal display device constitute an overlapping liquid crystal layer. Changes in the arrangement of liquid crystal molecules in any of the first liquid crystal layer and the second liquid crystal layer can change the birefringence of the overlapping liquid crystal layer, causing the transmittance of the corresponding area (pixel or pattern area) to change, ultimately presenting a displayed dot matrix image or simple pattern, meeting the needs of human-computer interaction and standby mode, thereby effectively reducing the power consumption of home appliances in standby mode and achieving the goal of energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a liquid crystal display device according to Example 1 of a preferred implementation manner of the utility model.

[0032] Figure 2 yes Figure 1 An overall view of the liquid crystal display device shown.

[0033] Figure 3 It is a structural schematic diagram of a liquid crystal display device according to Example 2 of a preferred implementation manner of the utility model. DETAILED DESCRIPTION

[0034] Embodiment 1, as Figure 1-2 As shown, this low-power liquid crystal display device includes a first liquid crystal box 1 and a second liquid crystal box 2 that are stacked on each other; the first liquid crystal box 1 includes a first liquid crystal layer 11 and a TFT array 12, and the TFT array 12 is used to drive the first liquid crystal layer 11 to form an active pixel array; the second liquid crystal box 2 includes a second liquid crystal layer 21 and a pattern electrode 22, and the pattern electrode 22 is used to drive the second liquid crystal layer 21 to form a display pattern; a first polarizer 3 is arranged on the side of the first liquid crystal box 1 away from the second liquid crystal box 2; a second polarizer 4 is arranged on the side of the second liquid crystal box 2 away from the first liquid crystal box 1.

[0035] The display pattern is a pattern or pen segment of a pre-designed shape. The display surface area where the active pixel array is located is defined as the display area 10. The display pattern is within the display area 10, and the area where it is located can be defined as the pattern area 20, while the area where the non-display pattern is located can be defined as the non-pattern area 30. The first polarizer 3 and the second polarizer 4 cover the display area 10. The first liquid crystal layer 11 and the second liquid crystal layer 21 constitute an overlapping liquid crystal layer. The change in the arrangement of liquid crystal molecules in any of the first liquid crystal layer 11 and the second liquid crystal layer 21 can change the birefringence of the overlapping liquid crystal layer, so that the transmittance of the corresponding area (pixel or pattern area 20) changes, and finally presents the displayed dot matrix image or simple pattern.

[0036] In this embodiment, the low-power liquid crystal display device further includes a first driving circuit for providing active driving for the first liquid crystal layer 11 and a second driving circuit for providing passive driving for the second liquid crystal layer 21. The first driving circuit is electrically connected to the TFT array 12 of the first liquid crystal box 1, and the second driving circuit is electrically connected to the pattern electrode 22 of the second liquid crystal box 2. When such a low-power liquid crystal display device is applied to home appliances, if the home appliances need human-computer interaction, the TFT array 12 of the first liquid crystal box 1 can be driven by the first driving circuit. The first driving circuit is connected to the TFT array 12, and image information is input to the TFT array 12, and then high-resolution active driving is provided for the first liquid crystal layer 11, thereby changing the birefringence of the overlapping liquid crystal layer at the pixel position, so that the liquid crystal display device can present a high-definition dot matrix image to meet the needs of human-computer interaction. When the home appliance is in standby mode, the first drive circuit can be turned off, and the pattern electrode 22 of the second liquid crystal box 2 can be driven by the second drive circuit, thereby changing the birefringence of the overlapping liquid crystal layer at the pattern electrode 22, so that the liquid crystal display device displays relatively simple pattern information. The second drive circuit is a passive drive with very low power consumption, which can achieve the purpose of standby power saving.

[0037] In this embodiment, the first liquid crystal cell 1 and the second liquid crystal cell 2 are fully bonded by a transparent adhesive layer 50 (such as OCA adhesive). The transparent adhesive layer 50 is bonded at least in the entire display area 10, thereby eliminating the air layer in the display area 10 and preventing the air layer from affecting the display of the display area 10.

[0038] In this embodiment, the first polarizer 3 and the second polarizer 4 are polarizers that include certain optical compensation. The polarization axis angles of the first polarizer 3 and the second polarizer 4, as well as the optical compensation design cooperate with the first liquid crystal layer 11 and the second liquid crystal layer 21 to achieve the desired display effect.

[0039] In this embodiment, the low-power liquid crystal display device further includes a backlight source 5 , which is disposed on a side of the first liquid crystal cell 1 away from the second liquid crystal cell 2 .

[0040] In this embodiment, the first liquid crystal box 1 further includes a first transparent substrate 13 and a second transparent substrate 14, and the first liquid crystal layer 11 is sandwiched between the first transparent substrate 13 and the second transparent substrate 14; the TFT array 12 is arranged on the side of the first transparent substrate 13 or the second transparent substrate 14 close to the first liquid crystal layer 11; the second liquid crystal box 2 further includes a third transparent substrate 23 and a fourth transparent substrate 24, and the second liquid crystal layer 21 is sandwiched between the third transparent substrate 23 and the fourth transparent substrate 24, and the pattern electrode 22 is formed by overlapping transparent electrodes (such as ITO electrodes) respectively arranged on the third transparent substrate 23 and the fourth transparent substrate 24. The resolution of the TFT array 12 is generally above 300 lines, and its TFT device can be a variety of thin film semiconductor devices such as α-Si, LTPS, IGZO, etc. The TFT array 12 generally also includes a driving circuit (such as a scanning line, a data line) and a pixel electrode (such as an ITO electrode). The pattern electrode 22 can be connected to the second driving circuit through a transparent lead, and it can change the arrangement of the liquid crystal in the pattern area 20 when a driving voltage (generally passive driving) is applied. In the pattern area 20 , the second liquid crystal layer 21 maintains a natural state (or a state close to the natural state) when no driving voltage (ON-state driving voltage) is applied, while in the non-pattern area 30 , the second liquid crystal layer 21 only maintains the natural state.

[0041] In order to achieve the desired display mode (mainly considering the display mode in the power saving state), the first liquid crystal layer 11 and the second liquid crystal layer 21 can adopt various display modes such as TN, IPS, VA, etc. To achieve the above display modes, in this embodiment, the first transparent substrate 13 and the second transparent substrate 14 are respectively provided with a first alignment layer and a second alignment layer on the side close to the first liquid crystal layer 11, and the third transparent substrate 23 and the fourth transparent substrate 24 are respectively provided with a third alignment layer and a fourth alignment layer on the side close to the second liquid crystal layer 21. The first alignment layer, the second alignment layer, the third alignment layer, and the fourth alignment layer can adopt horizontal alignment layers or vertical alignment layers, and are achieved by directional rubbing of the alignment layers at a certain orientation angle.

[0042] Table 1 below lists the designs adopted by the above-mentioned low-power LCD display device in display modes of various power-saving states;

[0043] Table 1:

[0044]

[0045] Wherein, P1 and P2 are polarization axis angles of the first polarizer 3 and the second polarizer 4 respectively, and θ1, θ2, θ3, and θ4 are directional rubbing angles of the first alignment layer, the second alignment layer, the third alignment layer, and the fourth alignment layer respectively.

[0046] In this embodiment, the low-power liquid crystal display device adopts the display mode 01 of the power saving state in Table 1, the first liquid crystal layer 11 and the second liquid crystal layer 21 are both twisted nematic mode (TN), the first liquid crystal layer 11 and the second liquid crystal layer 21 have opposite liquid crystal twist directions, θ1=45°, θ2=-45°, θ3=-45°, θ4=45°, P1=45°, P2=45°. Thus, the first liquid crystal layer 11 and the second liquid crystal layer 21 can form a mutual viewing angle compensation and dispersion compensation, so that the viewing angle characteristics of the liquid crystal display device are better and the color cast is smaller.

[0047] Example 2, reference Figure 3 , when other parts are the same as those in the first embodiment, the difference is that: in this embodiment, the low-power liquid crystal display device adopts the display mode 03 of the power saving state in Table 1, the second liquid crystal layer 21 is in the vertical alignment mode (VA), θ1=0°, θ2=-0°, θ3=45°, θ4=45°, P1=0°, P2=90°; the third alignment layer and the fourth alignment layer are vertical alignment layers, and the second liquid crystal layer 21 adopts negative liquid crystal (dielectric anisotropy is negative). Therefore, the second liquid crystal layer 21 is vertically arranged in the natural state, at least in the positive viewing angle, the second liquid crystal layer 21 will not affect the polarization state of the light, and the polarization state of the superimposed liquid crystal layer is only determined by the first liquid crystal layer 11, and its optical principle is simpler and easier to understand.

[0048] In this embodiment, the low power consumption liquid crystal display device further includes C - -plate compensation film 6, C - The compensation film 6 is arranged on the inner side of the second polarizer 4. - The -plate compensation film 6 is used to compensate for the optical path difference of the second liquid crystal layer 21 at an inclined viewing angle, and its compensation value is generally equivalent to the second liquid crystal layer 21, so that the second liquid crystal layer 21 will not cause light leakage at an inclined viewing angle, ensuring the black background color of the non-display area 10 and the OFF state display area 10 at an inclined viewing angle.

[0049] In addition, it should be noted that the names of the various parts of the specific embodiments described in this specification may be different, and any equivalent or simple changes made based on the structure, features and principles of the utility model patent are included in the protection scope of the utility model patent. The technical personnel in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A low power consumption liquid crystal display device, characterized in that: It includes a first liquid crystal box and a second liquid crystal box superimposed on each other; the first liquid crystal box includes a first liquid crystal layer and a TFT array, the TFT array is used to drive the first liquid crystal layer to form an active pixel array; the second liquid crystal box includes a second liquid crystal layer and a pattern electrode, the pattern electrode is used to drive the second liquid crystal layer to form a display pattern; a first polarizer is arranged on the side of the first liquid crystal box away from the second liquid crystal box; a second polarizer is arranged on the side of the second liquid crystal box away from the first liquid crystal box.

2. A low power consumption liquid crystal display device according to claim 1, characterized in that: The low-power liquid crystal display device also includes a first driving circuit for providing active driving for the first liquid crystal layer and a second driving circuit for providing passive driving for the second liquid crystal layer. The first driving circuit is electrically connected to the TFT array of the first liquid crystal box, and the second driving circuit is electrically connected to the pattern electrode of the second liquid crystal box.

3. A low power consumption liquid crystal display device according to claim 1, characterized in that: The first liquid crystal box also includes a first transparent substrate and a second transparent substrate, and the first liquid crystal layer is sandwiched between the first transparent substrate and the second transparent substrate; the TFT array is arranged on the side of the first transparent substrate or the second transparent substrate close to the first liquid crystal layer; the second liquid crystal box also includes a third transparent substrate and a fourth transparent substrate, and the second liquid crystal layer is sandwiched between the third transparent substrate and the fourth transparent substrate, and the pattern electrode is formed by overlapping transparent electrodes respectively arranged on the third transparent substrate and the fourth transparent substrate.

4. A low power consumption liquid crystal display device according to claim 3, characterized in that: The first and second transparent substrates are provided with a first alignment layer and a second alignment layer on their sides close to the first liquid crystal layer, respectively. The third and fourth transparent substrates are provided with a third alignment layer and a fourth alignment layer on their sides close to the second liquid crystal layer, respectively.

5. A low power consumption liquid crystal display device according to claim 4, characterized in that: The first liquid crystal layer and the second liquid crystal layer are both in twisted nematic mode, and the liquid crystal twisting directions of the first liquid crystal layer and the second liquid crystal layer are opposite; the polarization axis angle P1 of the first polarizer is 45°, the polarization axis angle P2 of the second polarizer is 45°, the directional rubbing angle θ1 of the first alignment layer is 45°, the directional rubbing angle θ2 of the second alignment layer is -45°, the directional rubbing angle θ3 of the third alignment layer is -45°, and the directional rubbing angle θ4 of the fourth alignment layer is 45°.

6. A low power consumption liquid crystal display device according to claim 4, characterized in that: The first liquid crystal layer is in coplanar switching mode, the second liquid crystal layer is in twisted nematic mode, the polarization axis angle P1 of the first polarizer is 0°, the polarization axis angle P2 of the second polarizer is 0°, the directional rubbing angle θ1 of the first alignment layer is 0°, the directional rubbing angle θ2 of the second alignment layer is 0°, the directional rubbing angle θ3 of the third alignment layer is 0°, and the directional rubbing angle θ4 of the fourth alignment layer is 90°.

7. A low power consumption liquid crystal display device according to claim 4, characterized in that: The second liquid crystal layer is in a vertical alignment mode, the third alignment layer and the fourth alignment layer are vertical alignment layers, and the second liquid crystal layer is a negative liquid crystal.

8. A low power consumption liquid crystal display device according to claim 7, characterized in that: The second liquid crystal layer adopts a multi-domain vertical alignment mode; the polarization axis angle P1 of the first polarizer is 0°, the polarization axis angle P2 of the second polarizer is 90°, the directional rubbing angle θ1 of the first alignment layer is 0°, and the directional rubbing angle θ2 of the second alignment layer is 0°.

9. A low power consumption liquid crystal display device according to claim 7, characterized in that: The low-power liquid crystal display device further comprises a C-plate compensation film, which is arranged on the inner side of the first polarizer or the second polarizer or between the first liquid crystal box and the second liquid crystal box.

10. A low power consumption liquid crystal display device according to any one of claims 1 to 9, characterized in that: The first liquid crystal box and the second liquid crystal box are fully bonded together by a transparent adhesive layer.

11. A low power consumption liquid crystal display device according to any one of claims 1 to 9, characterized in that: The low-power consumption liquid crystal display device further comprises a backlight source, which is arranged on a side of the first liquid crystal cell away from the second liquid crystal cell.

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