Liquid crystal display panel and display device

Abstract

The invention discloses a liquid crystal display panel and a display device. The liquid crystal display panel comprises a first substrate, a liquid crystal layer, a brightness adjusting layer and a second substrate which are stacked in sequence. The liquid crystal layer comprises a plurality of pixel areas, the screw pitches of liquid crystal materials in at least two pixel areas are different from each other, and the brightness adjusting layer comprises a plurality of selective light-transmitting areas and shading areas arranged among the multiple selective light-transmitting areas. According to the liquid crystal display panel, one pixel area corresponds to one pixel of the liquid crystal display panel, the shading area can be used for defining the boundary between the pixels, the situation of color mixing between the adjacent pixel areas is prevented, the problem of color crosstalk of the liquid crystal display panel is solved, the display picture of the liquid crystal display panel is clearer and more orderly, and therefore the contrast ratio of the liquid crystal display panel is improved. The light reflected by the liquid crystal layer can be further controlled through the selective light-transmitting area of the brightness adjusting layer, the brightness of the liquid crystal display panel is adjusted, the dark state of the liquid crystal display panel can be achieved under the low driving voltage, and more energy is saved.

Description

Technical Field

[0001] The present application belongs to the technical field of display devices, and in particular to liquid crystal display panels and display devices. Background Art

[0002] Liquid crystal displays (LCDs) utilize the photoelectric effect of liquid crystals to alter the alignment of liquid crystal molecules under the influence of an electric field, thereby changing the polarization state of light. Cholesteric liquid crystals are widely used in LCDs due to their unique optical properties, such as selective reflection, optical rotation, and bistability.

[0003] Existing full-color display solutions using cholesterol liquid crystals often require complex liquid crystal material ratios or complex display driving methods. Existing full-color display solutions using cholesterol liquid crystals also usually have problems such as color crosstalk, low contrast, and the need for a large driving voltage to switch between bright and dark states. Summary of the Invention

[0004] The purpose of the present application is to provide a liquid crystal display panel and a display device, aiming to solve the problems of color crosstalk, low contrast, and the need for a large driving voltage to switch between bright and dark states in traditional full-color display solutions using cholesterol liquid crystals.

[0005] A first aspect of an embodiment of the present application provides a liquid crystal display panel, comprising: a first substrate, a liquid crystal layer, a brightness adjustment layer, and a second substrate stacked in sequence; the liquid crystal layer comprises a plurality of pixel areas, and the pitches of the liquid crystal materials in at least two of the pixel areas are different from each other; the brightness adjustment layer comprises a plurality of selective light-transmitting areas and a shading area arranged between the plurality of selective light-transmitting areas; the shading area is configured to maintain a dark state based on a dark state voltage, and the selective light-transmitting area is configured to maintain a dark state based on the dark state voltage or to maintain a bright state based on a bright state voltage; the orthographic projection of the boundary line between the pixel areas on the first substrate is located within the orthographic projection of the shading area on the first substrate.

[0006] In one embodiment, the liquid crystal layer includes an isolation structure, and the isolation structure, the first substrate and the brightness adjustment layer enclose a plurality of accommodating cavities, and the accommodating cavities are used to fill the liquid crystal material; at least one of the accommodating cavities is provided in one of the pixel areas.

[0007] In one embodiment, the orthographic projection of the isolation structure on the first substrate is located within the orthographic projection of the light-shielding area on the first substrate.

[0008] In one embodiment, the brightness adjustment layer includes an electrochromic layer, the electrochromic layer in the shading area is used to maintain a dark state based on the dark state voltage, and the electrochromic layer in the selective light-transmitting area is used to maintain a dark state based on the dark state voltage or to maintain a bright state based on the bright state voltage.

[0009] In one embodiment, the brightness adjustment layer further includes a first transparent electrode layer, an ion conduction layer, an ion storage layer, a second transparent electrode layer, an insulating layer and a third transparent electrode layer; the first transparent electrode layer is arranged on a surface of the second substrate on one side close to the first substrate, and the first transparent electrode layer, the electrochromic layer, the ion conduction layer, the ion storage layer, the second transparent electrode layer, the insulating layer and the third transparent electrode layer are stacked in sequence along the direction close to the first substrate; the second transparent electrode layer includes a plurality of first sub-electrodes, the first sub-electrodes correspond one-to-one to the selective light transmission area, and the orthographic projection of the selective light transmission area on the first substrate coincides with the orthographic projection of the corresponding first sub-electrode on the first substrate; some of the first sub-electrodes are electrically connected through the third transparent electrode layer; the second transparent electrode layer further includes a second sub-electrode, and the orthographic projection of the shading area on the first substrate and the orthographic projection of the second sub-electrode on the first substrate coincide with each other.

[0010] In one embodiment, the liquid crystal display panel also includes a driving circuit layer, which is arranged on a side surface of the first substrate close to the second substrate; the driving circuit layer includes a plurality of scanning signal lines and a plurality of data signal lines, and the orthographic projections of the scanning signal lines and the data signal lines on the first substrate are located within the orthographic projection of the isolation structure on the first substrate.

[0011] In one embodiment, the driving circuit layer further includes a plurality of thin film transistors, and the orthographic projections of the thin film transistors on the first substrate are located within the orthographic projection of the isolation structure on the first substrate.

[0012] In one embodiment, the thin film transistor is a top-gate thin film transistor.

[0013] In one embodiment, the liquid crystal display panel further includes a plurality of common electrodes and a plurality of pixel electrodes, wherein the common electrodes are arranged on a portion of the surface of the driving circuit layer close to the liquid crystal layer, and the pixel electrodes are arranged on a portion of the surface of the brightness adjustment layer close to the liquid crystal layer.

[0014] A second aspect of the embodiments of the present application provides a display device including the display panel as described above.

[0015] Compared with the prior art, the embodiments of the present application have the following advantages: one pixel area corresponds to one pixel of the liquid crystal display panel, and the light-shielding area can be used to define the boundaries between pixels, preventing color mixing between adjacent pixel areas, solving the problem of color crosstalk in the liquid crystal display panel, making the display image of the liquid crystal display panel clearer and more orderly, thereby improving the contrast of the liquid crystal display panel. The selective light-transmitting area of ​​the brightness adjustment layer further controls the light reflected by the liquid crystal layer to adjust the brightness of the liquid crystal display panel, and can achieve a dark state in the selective light-transmitting area at a lower voltage, thereby reducing power consumption and achieving energy conservation, and avoiding the problem of low contrast caused by the cholesterol liquid crystal not being able to achieve full dark when the driving voltage is insufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic cross-sectional view of a liquid crystal display panel provided in one embodiment of the present application; Figure 2 Another schematic cross-sectional view of a liquid crystal display panel provided in one embodiment of the present application; Figure 3 A top view of an isolation structure provided in one embodiment of the present application; Figure 4 A schematic cross-sectional view of a brightness adjustment layer provided in one embodiment of the present application; Figure 5 A schematic structural diagram of a third transparent electrode layer and a second transparent electrode layer provided in an embodiment of the present application; Figure 6 A schematic cross-sectional view of a driving circuit layer provided in one embodiment of the present application; Figure 7 This is another cross-sectional schematic diagram of a liquid crystal display panel provided in one embodiment of the present application; Figure 8 A schematic diagram of a display device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0017] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0018] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0019] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0021] Figure 1 A schematic diagram of a gate drive circuit provided in an embodiment of the present application is shown. For ease of explanation, only the portion related to this embodiment is shown, which is described in detail as follows: A liquid crystal display panel 10 includes: a first substrate 100, a liquid crystal layer 200, a brightness adjustment layer 300, and a second substrate 400 stacked in sequence.

[0022] The liquid crystal layer 200 includes a plurality of pixel regions 210 , and the helical pitches of the liquid crystal materials in at least two pixel regions 210 are different from each other.

[0023] The brightness adjustment layer 300 includes a plurality of selective light transmission areas 310 and light shielding areas 320 disposed between the selective light transmission areas 310. The light shielding areas 320 are configured to maintain a dark state based on a dark state voltage, and the selective light transmission areas 310 are configured to maintain a dark state based on a dark state voltage or a bright state based on a bright state voltage.

[0024] The brightness adjustment layer 300 can be connected to a peripheral circuit to obtain a dark state voltage and a bright state voltage.

[0025] The orthographic projection of the boundary line between the pixel areas 210 on the first substrate 100 is located within the orthographic projection of the light shielding area 320 on the first substrate 100 .

[0026] It can be understood that one pixel area 210 corresponds to one pixel of the liquid crystal display panel 10, and the shading area 320 can be used to define the boundaries between pixels, prevent color mixing between adjacent pixel areas 210, solve the problem of color crosstalk of the liquid crystal display panel 10, and make the display image of the liquid crystal display panel 10 clearer and more orderly, thereby improving the contrast of the liquid crystal display panel 10.

[0027] When the liquid crystal display panel 10 displays black only by switching the liquid crystal layer 200 to a dark state, a higher driving voltage usually needs to be applied to the liquid crystal layer 200, while the selective light-transmitting area 310 of the brightness adjustment layer 300 can switch the selective light-transmitting area 310 to a dark state with a lower voltage. The brightness adjustment layer 300 further controls the light reflected by the liquid crystal layer 200 to adjust the brightness of the liquid crystal display panel 10, which can not only reduce power consumption and achieve energy saving, but also avoid the low contrast problem caused by the cholesterol liquid crystal not being able to achieve complete darkness when the driving voltage is insufficient.

[0028] In some embodiments, the plurality of pixel regions 210 include at least one first pixel region, at least one second pixel region, and at least one third pixel region, and the liquid crystal materials in the first pixel region, the second pixel region, and the third pixel region have different pitches.

[0029] It is understood that by selecting a liquid crystal material with an appropriate helical pitch, the pixel region 210 can be configured to reflect light of the corresponding color. In some embodiments, the first pixel region of the liquid crystal layer 200 can be configured to reflect red light, the second pixel region of the liquid crystal layer 200 can be configured to reflect green light, and the third pixel region of the liquid crystal layer 200 can be configured to reflect blue light.

[0030] In one embodiment, if Figure 2 As shown, the liquid crystal layer 200 includes an isolation structure 220. The isolation structure 220, the first substrate 100 and the brightness adjustment layer 300 enclose a plurality of accommodating cavities 230. The accommodating cavities 230 are used to fill liquid crystal materials. At least one accommodating cavity 230 is provided in a pixel area 210.

[0031] The isolation structure 220 may specifically be composed of a support column (Photo Spacer; PS), which can support the first substrate 100 and the second substrate 400 while enclosing the space between the first substrate 100 and the second substrate 400 to form a plurality of accommodating cavities 230 .

[0032] like Figure 3 As shown in the top view, the isolation structure 220 is in a mesh shape, enclosing a plurality of square accommodating cavities 230 , and each accommodating cavities 230 is arranged in a matrix.

[0033] It can be understood that, on the one hand, the construction of the liquid crystal layer 200 can be achieved at a lower cost by first setting up the isolation structure 220 and then filling the liquid crystal material through the ODF (one dropfilling) method. On the other hand, the isolation structure 220 is used to strengthen the isolation of the liquid crystal materials in different pixel areas 210, reduce color crosstalk and improve contrast.

[0034] In one embodiment, the orthographic projection of the isolation structure 220 on the first substrate 100 is located within the orthographic projection of the light shielding area 320 on the first substrate 100 , so as to prevent the non-reflective black area in the liquid crystal display panel 10 from being too large.

[0035] In one embodiment, if Figure 4 、 Figure 5 As shown, the brightness adjustment layer 300 includes an electrochromic layer 330. The electrochromic layer 330 in the light-shielding area 320 is used to maintain a dark state based on a dark state voltage, and the electrochromic layer 330 in the light-transmitting area 310 is used to maintain a dark state based on a dark state voltage or to maintain a bright state based on a bright state voltage.

[0036] It is understood that by applying a voltage to the electrochromic layer 330 , the electrochromic layer 330 can be switched between a dark state and a bright state.

[0037] In some embodiments, the dark state voltage may be 2.5 V to 3 V. When no voltage is applied to the electrochromic layer 330 , the electrochromic layer 330 is in a transparent state.

[0038] In one embodiment, if Figure 4 、 Figure 5 As shown, the brightness adjustment layer 300 further includes a first transparent electrode layer 340 , an ion conduction layer 350 , an ion storage layer 360 , a second transparent electrode layer 370 , an insulating layer 380 and a third transparent electrode layer 390 .

[0039] The first transparent electrode layer 340 is disposed on a surface of the second substrate 400 on a side close to the first substrate 100. The first transparent electrode layer 340, the electrochromic layer 330, the ion conductive layer 350, the ion storage layer 360, the second transparent electrode layer 370, the insulating layer 380 and the third transparent electrode layer 390 are stacked in sequence along a direction close to the first substrate 100. The second transparent electrode layer 370 includes a plurality of first sub-electrodes 371. Each of the first sub-electrodes 371 corresponds to the selective light-transmitting area 310 one by one. The orthographic projection of the selective light-transmitting area 310 on the first substrate 100 coincides with the orthographic projection of the corresponding first sub-electrode 371 on the first substrate 100. Some of the first sub-electrodes 371 are electrically connected via the third transparent electrode layer 390. The second transparent electrode layer 370 further includes a second sub-electrode 372 . The orthographic projection of the light-shielding area 320 on the first substrate 100 and the orthographic projection of the second sub-electrode 372 on the first substrate 100 overlap with each other.

[0040] It can be understood that when the voltage on the first transparent electrode layer 340 is fixed, different voltages can be applied to the first sub-electrode 371 and the second sub-electrode 372, so as to control the transmittance of the electrochromic layer 330 in the selective light-transmitting area 310 and the electrochromic layer 330 in the shading area 320, respectively.

[0041] The first transparent electrode layer 340 , the second transparent electrode layer 370 and the third transparent electrode layer 390 may be made of at least one of indium tin oxide (ITO), fluorine-doped tin oxide (FTO) and aluminum-doped zinc oxide (AZO), with a thickness of 200 nm to 500 nm.

[0042] The electrochromic layer 330 can be made of an organic electrochromic material, such as a conductive polymer, terephthalic acid, and cyanobiphenyl, or an inorganic electrochromic material, such as at least one of tungsten trioxide (WO3), titanium dioxide (TiO2), tantalum pentoxide (Ta2O5), nickel oxide (NiO), and vanadium pentoxide (V2O5). The thickness of the electrochromic layer 330 is 300 nm to 700 nm.

[0043] The ion conducting layer 350 is mainly used for ion conduction and barrier. Its material can be at least one of lithium niobate, lithium aluminate, and lithium tantalate. The thickness of the ion conducting layer 350 is 100 nm to 300 nm.

[0044] The ion storage layer 360 is mainly used to store corresponding counterions and maintain charge balance when an oxidation-reduction reaction occurs in the electrochromic layer 330. The material of the ion storage layer 360 can be a metal oxide, such as at least one of niobium oxide (Nb2O5), nickel oxide (NiO), iridium oxide (IrO2), and vanadium oxide (V2O5); it can also be at least one of lithium cobalt oxide (LiCoO2), lithium manganese oxide (LiMnO4), and lithium nickel oxide (H3LiNiO).

[0045] The insulating layer 380 is provided with a plurality of via holes 381 , and the second transparent electrode layer 370 and the third transparent electrode layer 390 can be connected via the via holes 381 . The insulating layer 380 can be made of SiNx, and has a thickness of 100 nm to 200 nm.

[0046] In one embodiment, if Figure 6 As shown, the liquid crystal display panel 10 further includes a driving circuit layer 500, which is disposed on a surface of the first substrate 100 on a side adjacent to the second substrate 400. The driving circuit layer 500 includes a plurality of scan signal lines and a plurality of data signal lines, and the orthographic projections of the scan signal lines and the data signal lines on the first substrate 100 are located within the orthographic projection of the isolation structure 220 on the first substrate 100.

[0047] It can be understood that by making the orthographic projections of the scanning signal lines and the data signal lines on the first substrate 100 be located within the orthographic projection of the isolation structure 220 on the first substrate 100, so as to avoid the scanning signal lines, the data signal lines and the isolation structure 220 affecting the box alignment of the first substrate 100 and the second substrate 400, the alignment accuracy of the first substrate 100 and the second substrate 400 can be improved, and the light transmittance of the liquid crystal display panel 10 can be enhanced.

[0048] In one embodiment, if Figure 6 As shown, the driving circuit layer 500 further includes a plurality of thin-film transistors 510. The orthographic projections of the thin-film transistors 510 on the first substrate 100 are located within the orthographic projections of the isolation structure 220 on the first substrate 100. This prevents the thin-film transistors 510 and the isolation structure 220 from affecting the alignment of the first substrate 100 and the second substrate 400, thereby improving the alignment accuracy of the first substrate 100 and the second substrate 400 and enhancing the light transmittance of the liquid crystal display panel 10.

[0049] In one embodiment, the thin film transistor 510 is a top-gate thin film transistor. Specifically, if Figure 6 As shown, the thin film transistor 510 includes a source electrode 511 , a drain electrode 512 , a doped semiconductor active layer 513 , an intrinsic semiconductor active layer 514 , a gate insulating layer 515 and a gate electrode 516 . The driving circuit layer 500 further includes an insulating protection layer 520 .

[0050] The source electrode 511 and the drain electrode 512 are arranged at intervals on the first substrate 100, and a doped semiconductor active layer 513 is provided on the source electrode 511 and the drain electrode 512. The intrinsic semiconductor active layer 514 is arranged on the first substrate 100 between the two doped semiconductor active layers 513, and covers the side surface of the two doped semiconductor active layers 513 away from the first substrate 100. The gate insulating layer 515 covers the side surface of the intrinsic semiconductor active layer 514 away from the first substrate 100. The gate electrode 516 covers the side surface of the gate insulating layer 515 away from the first substrate 100. The insulating protection layer 520 covers the side surface of the thin film transistor 510 away from the first substrate 100 and the remaining surface of the first substrate 100.

[0051] It is understandable that the gate 516 disposed on the top of the thin film transistor 510 can prevent incident light from irradiating the active layer, generating photogenerated carriers, and affecting the electrical performance of the thin film transistor 510 .

[0052] In one embodiment, if Figure 6 、 Figure 7As shown, the liquid crystal display panel 10 also includes a plurality of common electrodes 610 and a plurality of pixel electrodes 620. The common electrodes 610 are arranged on a portion of the surface of the driving circuit layer 500 close to the liquid crystal layer 200, and the pixel electrodes 620 are arranged on a portion of the surface of the brightness adjustment layer 300 close to the liquid crystal layer 200.

[0053] At least one common electrode 610 and at least one pixel electrode 620 are disposed in a receiving cavity 230. Specifically, the pixel electrode 620 can be electrically connected to the thin film transistor 510. Applying voltage to the liquid crystal material in the accommodating cavity 230 through the common electrode 610 and the pixel electrode 620 can change the light reflection of the liquid crystal layer 200 (i.e., change the brightness of the liquid crystal display panel 10).

[0054] In some embodiments, as Figure 6 As shown, the liquid crystal display panel 10 further includes a planar layer 700 , which is used to cover the driving circuit layer 500 and the common electrode 610 on a side away from the first substrate 100 .

[0055] In some embodiments, as Figure 6 As shown, the liquid crystal display panel 10 further includes a light absorbing layer 800 , which is disposed on the planar layer 700 and is configured to absorb light of other wavelengths that are not reflected by the liquid crystal layer 200 , so as to further improve contrast.

[0056] In some embodiments, as Figure 6 As shown, the driving circuit layer 500 also includes a coupling electrode 530, which is arranged on the first substrate 100 and connected to the source electrode 511, and the insulating protective layer 520 covers the side surface of the coupling electrode 530 away from the first substrate 100. The common electrode 610 is arranged on the side surface of the insulating protective layer 520 away from the first substrate 100, and the orthographic projection of the coupling electrode 530 on the first substrate 100 at least partially overlaps with the orthographic projection of the common electrode 610 on the first substrate 100.

[0057] The common electrode 610 and the coupling electrode 530 may be coupled to each other to form a storage capacitor, so that the liquid crystal display panel 10 can maintain image display for a period of time after power is turned off.

[0058] Figure 8 A schematic diagram of a display device provided in an embodiment of the present application is shown. For ease of explanation, only the portion related to this embodiment is shown, which is described in detail as follows: A display device 20 includes the display panel 10 according to any one of the above embodiments.

[0059] Since the display device 20 includes the display panel 10 of any of the above embodiments, the display device 20 has the beneficial effects of the display panel 10 of any of the above embodiments, which will not be described in detail here.

[0060] In some embodiments, the display device 20 may specifically be a smart device such as color electronic paper, a mobile phone, or a computer.

[0061] Through the description of the above embodiments, those skilled in the art will understand that for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0062] It should be understood that the devices and methods disclosed in the several embodiments provided in this application can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device. In addition, some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0063] Units described as separate components may or may not be physically separate. Components shown as units may be one physical unit or multiple physical units. That is, they may be located in one place or distributed across multiple locations. Depending on actual needs, some or all of the units may be selected to achieve the objectives of this solution.

[0064] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit; may also exist physically separately; or some units may be integrated into a single unit, while some units may exist physically separately. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0065] It should be noted that all or part of the above-mentioned embodiments provided in this application (for example, part or all of any feature) can be arbitrarily combined or used in conjunction with each other.

[0066] The above content is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A liquid crystal display panel, characterized in that: include: A first substrate, a liquid crystal layer, a brightness adjustment layer, and a second substrate stacked in sequence; The liquid crystal layer comprises a plurality of pixel regions, and the helical pitches of the liquid crystal materials in at least two of the pixel regions are different from each other; The brightness adjustment layer includes a plurality of selective light-transmitting areas and a light-shielding area disposed between the plurality of selective light-transmitting areas; the light-shielding area is configured to maintain a dark state based on a dark-state voltage, and the selective light-transmitting area is configured to maintain a dark state based on the dark-state voltage or to maintain a bright state based on a bright-state voltage; An orthographic projection of a boundary line between the pixel areas on the first substrate is located within an orthographic projection of the light-shielding area on the first substrate.

2. The liquid crystal display panel according to claim 1, wherein The liquid crystal layer includes an isolation structure, wherein the isolation structure, the first substrate and the brightness adjustment layer enclose a plurality of accommodating cavities, and the accommodating cavities are used to fill the liquid crystal material; At least one accommodating cavity is provided in one of the pixel areas.

3. The liquid crystal display panel according to claim 2, wherein The orthographic projection of the isolation structure on the first substrate is located within the orthographic projection of the light-shielding area on the first substrate.

4. The liquid crystal display panel according to claim 1, wherein The brightness adjustment layer includes an electrochromic layer, the electrochromic layer in the light-shielding area is used to maintain a dark state based on the dark state voltage, and the electrochromic layer in the selective light-transmitting area is used to maintain a dark state based on the dark state voltage or maintain a bright state based on the bright state voltage.

5. The liquid crystal display panel according to claim 4, wherein The brightness adjustment layer further includes a first transparent electrode layer, an ion conduction layer, an ion storage layer, a second transparent electrode layer, an insulating layer and a third transparent electrode layer; The first transparent electrode layer is provided on a surface of the second substrate close to the first substrate, and the first transparent electrode layer, the electrochromic layer, the ion conductive layer, the ion storage layer, the second transparent electrode layer, the insulating layer and the third transparent electrode layer are stacked in sequence along a direction close to the first substrate; The second transparent electrode layer includes a plurality of first sub-electrodes, each of the first sub-electrodes corresponding to the selective light-transmitting area one by one, and an orthographic projection of the selective light-transmitting area on the first substrate coincides with an orthographic projection of the corresponding first sub-electrode on the first substrate; some of the first sub-electrodes are electrically connected via the third transparent electrode layer; The second transparent electrode layer further includes a second sub-electrode, and an orthographic projection of the light-shielding area on the first substrate and an orthographic projection of the second sub-electrode on the first substrate overlap with each other.

6. The liquid crystal display panel according to claim 2, wherein: The liquid crystal display panel further includes a driving circuit layer, and the driving circuit layer is arranged on a surface of the first substrate close to the second substrate; The driving circuit layer includes a plurality of scanning signal lines and a plurality of data signal lines. The orthographic projections of the scanning signal lines and the data signal lines on the first substrate are located within the orthographic projection of the isolation structure on the first substrate.

7. The liquid crystal display panel according to claim 6, wherein: The driving circuit layer further includes a plurality of thin film transistors, and the orthographic projections of the thin film transistors on the first substrate are located within the orthographic projection of the isolation structure on the first substrate.

8. The liquid crystal display panel according to claim 7, wherein: The thin film transistor is a top-gate thin film transistor.

9. The liquid crystal display panel according to claim 6, wherein: The liquid crystal display panel further includes a plurality of common electrodes and a plurality of pixel electrodes. The common electrodes are arranged on a portion of the surface of the driving circuit layer close to the liquid crystal layer, and the pixel electrodes are arranged on a portion of the surface of the brightness adjustment layer close to the liquid crystal layer.

10. A display device, characterized in that: The display panel comprises the display panel according to any one of claims 1 to 9.

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