Display panel and display device

Abstract

The utility model relates to a kind of display panel and display device, display panel includes the first liquid crystal module, second liquid crystal module and backlight module of laminated arrangement;First liquid crystal module includes the first substrate, first liquid crystal layer, second substrate of sequentially laminated arrangement;Second liquid crystal module includes the third substrate, second liquid crystal layer, fourth substrate of sequentially laminated arrangement;Wherein, second substrate is adjacent with third substrate, fourth substrate is adjacent with backlight module;First liquid crystal module and / or second liquid crystal module are equipped with color film substrate, color film substrate is equipped with photonic crystal layer, photonic crystal layer carries out reflection or transmission to different waveband light.The utility model uses the structure of transmission and reflection integration, can simultaneously realize reflection display and transmission display, by half-transmission half-reflection display function, both can save power consumption, can also meet the use demand of different scene, solve the problem of conventional reflection architecture in night display effect is poor.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display technology, and in particular to a display panel and display device. Background Technology

[0002] Currently, Liquid Crystal Displays (LCDs) have become the mainstream display technology, widely used in consumer electronics, commercial displays, industrial control, and many other fields. With the continuous advancement and development of LCD technology, people's demands for the performance and functionality of LCDs are constantly increasing. Modern users not only pursue high resolution, high refresh rate, and wide color gamut display effects, but also place higher demands on display power consumption, portability, and eye-friendly features. Although traditional LCD panels have many advantages such as good image quality, light weight, low power consumption, and small size, as the technology matures and people's needs grow, ordinary e-books and blackboards that can only display monochrome and cannot achieve mixed color or white display, and whose single display function can no longer meet the market's demand for multifunctional, high-definition display devices.

[0003] Flat panel displays offer numerous advantages over traditional cathode ray tube (CRT) displays, such as a thinner and lighter design, lower driving voltage, no flicker, and a longer lifespan. Flat panel displays are primarily divided into two categories: active-matrix displays and passive-matrix displays. Active-matrix displays, such as OLEDs (Organic Light Emitting Diodes), are self-emissive and offer advantages like high contrast and fast response times. Passive-matrix displays, on the other hand, require an external light source to display images. For example, thin-film transistor liquid crystal displays (TFT-LCDs) are a type of passive-matrix display. They modulate the backlight by changing the arrangement of liquid crystal molecules to display images. Due to their advantages such as stable images, realistic visuals, radiation elimination, space saving, and energy efficiency, TFT-LCDs have been widely used in televisions, mobile phones, and other electronic products, and have become the dominant technology in the flat panel display field.

[0004] Current liquid crystal display (LCD) devices are mainly classified into three types: transmissive, semi-transmissive, and reflective. Transmissive LCDs require a backlight module to provide a light source and are suitable for dimly lit environments. Semi-transmissive LCDs combine both transmissive and reflective modes, allowing them to operate under various lighting conditions. Reflective LCDs achieve their display purpose by adding a reflective filter to the back of the display panel. Ambient light is reflected by the filter and then transmitted through the pixel area. Compared to transmissive and semi-transmissive LCDs, reflective LCDs can fully utilize ambient light as a lighting source to display images without requiring a backlight module, making them more energy-efficient and environmentally friendly. For example, reflective LCDs are commonly used outdoors or in well-lit offices. The image quality of a reflective LCD is closely related to the brightness of the light reflected by the reflective filter. The brighter the ambient light and the higher the reflective filter's efficiency in reflecting ambient light, the higher the contrast ratio of the display and the clearer the displayed image. However, existing reflective filters absorb a significant portion of ambient light while reflecting it, resulting in reduced utilization of ambient light by the reflective display device and adverse effects such as decreased contrast.

[0005] However, existing reflective architectures still have many limitations in display technology. First, their most significant drawback is that they cannot achieve color display, or if a full-color reflective effect is to be achieved, a three-layer assembly structure is required, resulting in a thicker cell and placing higher demands on the assembly process. In actual production, it is difficult to guarantee sufficient assembly precision. In addition, due to the limitations of the optical path structure, the amount of light emitted by this architecture is significantly insufficient, resulting in weak brightness and contrast of the displayed image. In the dark of night or under low light conditions, the display effect will further deteriorate, making it difficult to meet users' requirements for a high-quality visual experience.

[0006] Therefore, there is a need for a display panel and display device that can switch between reflective and transmissive displays to meet the needs of different scenarios, achieve full-color display to meet users' display needs, and reduce box thickness and cost. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, this utility model provides a display panel and a display device.

[0008] The technical solution of this utility model is as follows:

[0009] A display panel includes a first liquid crystal module, a second liquid crystal module, and a backlight module stacked together;

[0010] The first liquid crystal module includes a first substrate, a first liquid crystal layer, and a second substrate stacked sequentially.

[0011] The second liquid crystal module includes a third substrate, a second liquid crystal layer, and a fourth substrate stacked sequentially.

[0012] Wherein, the second substrate is adjacent to the third substrate, and the fourth substrate is adjacent to the backlight module;

[0013] The first liquid crystal module and / or the second liquid crystal module are provided with a color filter substrate, and the color filter substrate is provided with a photonic crystal layer, which reflects or transmits light of different wavelengths.

[0014] As a further improvement of this invention, the photonic crystal layer includes a plurality of two-dimensional photonic crystals.

[0015] As a further improvement of this utility model, the photonic crystal layer includes at least a red region, a green region and a blue region. The two-dimensional photonic crystal in the red region reflects red light and transmits other light, the two-dimensional photonic crystal in the green region reflects green light and transmits other light, and the two-dimensional photonic crystal in the blue region reflects blue light and transmits other light.

[0016] As a further improvement of this utility model, there are multiple red areas, green areas and blue areas. Each red area is adjacent to one blue area and one green area, each green area is adjacent to one red area and one blue area, and each blue area is adjacent to one red area and one green area.

[0017] As a further improvement of this utility model, a circular polarizer is provided on the side of the first substrate away from the first liquid crystal layer, a first linear polarizer is provided between the second substrate and the third substrate, and a second linear polarizer is provided between the fourth substrate and the backlight module.

[0018] As a further improvement of this utility model, the color filter substrate is provided and disposed between the first liquid crystal layer and the second substrate, the absorption axis angle of the circular polarizer is the same as or orthogonal to that of the first linear polarizer, and the absorption axis angle of the circular polarizer is the same as or orthogonal to that of the second linear polarizer.

[0019] As a further improvement of this utility model, the color filter substrate is provided and disposed between the third substrate and the second liquid crystal layer, the absorption axis angle of the circular polarizer and the first linear polarizer is orthogonal, and the absorption axis angle of the second linear polarizer and the circular polarizer or the first linear polarizer is the same.

[0020] As a further improvement of this utility model, both the first liquid crystal module and the second liquid crystal module are provided with color filter substrates, namely a first color filter substrate and a second color filter substrate. The first color filter substrate is disposed between the first liquid crystal layer and the second substrate, and the second color filter substrate is disposed between the third substrate and the second liquid crystal layer. The absorption axis angles of the circular polarizer and the first linear polarizer are the same or orthogonal. The absorption axis angles of the circular polarizer and the second linear polarizer are the same or orthogonal.

[0021] As a further improvement of this utility model, the red area on the first color filter substrate corresponds to the blue area on the second color filter substrate, the blue area on the first color filter substrate corresponds to the green area on the second color filter substrate, and the green area on the first color filter substrate corresponds to the red area on the second color filter substrate.

[0022] A display device includes a display panel as described above.

[0023] According to the above-described solution, the beneficial effects of this utility model are as follows:

[0024] 1. This utility model adopts a structure that integrates transmission and reflection, which can realize both reflective and transmission display at the same time. Through the semi-transparent and semi-reflective display function, it can save power consumption and meet the needs of different scenarios, solving the problem of poor display effect of conventional reflective architecture at night.

[0025] 2. This utility model achieves light transmission and reflection through photonic crystals, enabling full-color display and meeting users' display needs for a high-quality visual experience;

[0026] 3. This utility model utilizes the reflection of light by photonic crystals, saving the metal reflective layer required by conventional reflective architectures. In addition, compared with conventional full-color reflective architectures, it reduces the thickness of one cell layer, thereby reducing costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of the light change in the transmission mode of the first embodiment of this utility model;

[0029] Figure 3 This is a schematic diagram of the light change in the reflection mode of the first embodiment of this utility model;

[0030] Figure 4 This is a schematic diagram of the light change in the transmission mode of the second structure according to the first embodiment of this utility model;

[0031] Figure 5This is a schematic diagram of the light changes in the three transmission modes of the first embodiment of this utility model;

[0032] Figure 6 This is a schematic diagram of the light changes in the four transmission modes of the first embodiment of this utility model;

[0033] Figure 7 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0034] Figure 8 This is a schematic diagram of the light changes in the five transmission modes of the second embodiment of this utility model;

[0035] Figure 9 This is a schematic diagram of the light changes in the five-reflection mode of the second embodiment of this utility model;

[0036] Figure 10 This is a schematic diagram of the light changes in the six transmission modes of the second embodiment of this utility model;

[0037] Figure 11 This is a structural schematic diagram of the third embodiment of the present utility model;

[0038] Figure 12 This is a schematic diagram of the light change in the transmission mode of the structure seven of the third embodiment of this utility model;

[0039] Figure 13 This is a schematic diagram of the light changes in the seven-reflection mode of the third embodiment of this utility model;

[0040] Figure 14 This is a schematic diagram of the light changes in the eight transmission modes of the structure in the third embodiment of this utility model;

[0041] Figure 15 This is a schematic diagram of the light change in the transmission mode of structure nine in the third embodiment of this utility model;

[0042] Figure 16 This is a schematic diagram of the light change in the transmission mode of the third embodiment of this utility model;

[0043] Figure 17 This is a schematic diagram of the structure of the single-layer photonic crystal layer of this utility model;

[0044] Figure 18 This is a schematic diagram of the structure of the double-layer photonic crystal layer of this utility model;

[0045] Figure 19 This is a schematic diagram of the combination of light and color in this utility model.

[0046] In the diagram: 1. First liquid crystal module; 11. First substrate; 12. First liquid crystal layer; 13. Second substrate; 14. Photonic crystal layer; 141. Red area; 142. Green area; 143. Blue area; 2. Second liquid crystal module; 21. Third substrate; 22. Second liquid crystal layer; 23. Fourth substrate; 3. Backlight module; 4. Circular polarizer; 5. First linear polarizer; 6. Second linear polarizer; 7. Light polarization direction. Detailed Implementation

[0047] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0048] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0050] See Figure 1 This utility model provides a display panel, including a first liquid crystal module 1, a second liquid crystal module 2 and a backlight module 3 stacked together;

[0051] The first liquid crystal module 1 includes a first substrate 11, a first liquid crystal layer 12, and a second substrate 13 stacked sequentially.

[0052] The second liquid crystal module 2 includes a third substrate 21, a second liquid crystal layer 22, and a fourth substrate 23 stacked sequentially.

[0053] Among them, the second substrate 13 is adjacent to the third substrate 21, and the fourth substrate 23 is adjacent to the backlight module 3;

[0054] The first liquid crystal module 1 and / or the second liquid crystal module 2 are provided with a color filter substrate. That is, the color filter substrate can be one piece and disposed in the first liquid crystal module 1, or disposed in the second liquid crystal module 2, or it can be two pieces, one in the first liquid crystal module 1 and one in the second liquid crystal module 2. The color filter substrate is provided with a photonic crystal layer 14, which reflects or transmits light of different wavelengths.

[0055] This invention adopts an integrated transmission and reflection structure, enabling simultaneous reflection and transmission display. Through its semi-transparent and semi-reflective display function, it saves power consumption and meets the needs of different scenarios, solving the problem of poor display performance at night in conventional reflective architectures. By using photonic crystals to achieve light transmission and reflection, it enables full-color display, meeting users' demands for a high-quality visual experience. Furthermore, by utilizing photonic crystals to reflect light, this invention eliminates the need for the metal reflective layer required in conventional reflective architectures. In addition, compared to conventional full-color reflective architectures, it reduces the cell thickness by one layer, thereby lowering costs.

[0056] As one embodiment of this utility model, the first liquid crystal layer 12 is a twisted nematic liquid crystal (TN), or a planar conversion liquid crystal (IPS), or a vertically aligned liquid crystal (VA), and the second liquid crystal layer 22 is a twisted nematic liquid crystal (TN), or a planar conversion liquid crystal (IPS), or a vertically aligned liquid crystal (VA). That is, there are no special requirements for the selection of the first liquid crystal layer 12 and the second liquid crystal layer 22, and both can be selected according to the specific usage requirements to choose the appropriate working mode.

[0057] As one embodiment of this invention, the photonic crystal layer 14 includes several two-dimensional photonic crystals. Two-dimensional photonic crystals are artificial microstructure materials with significant application value in the fields of optics and electromagnetics. Through periodically arranged variations in dielectric constant (refractive index), they can modulate electromagnetic waves within a specific frequency range, forming a "photonic bandgap" similar to the band structure of a semiconductor. The periodic structure of the photonic crystal forms a bandgap region, allowing photons to pass through only within certain frequency ranges. This characteristic gives it great potential in fields such as optical communication, integrated optics, and sensors. The bandgap of a photonic crystal refers to the region within a specific frequency range where light waves cannot propagate through the crystal. Within the bandgap frequency range, light waves encounter continuous scattering, and their propagation is strongly suppressed. Therefore, when a light wave attempts to enter a photonic crystal with a bandgap matching its frequency, it is reflected back rather than absorbed or propagated.

[0058] The calculation process for the periodic diameter of the photonic crystal is as follows:

[0059] Assuming the target is red light with a wavelength of 700 nanometers, for a two-dimensional photonic crystal, the period diameter d is estimated using the conditions of Bragg diffraction.

[0060] Bragg diffraction equation: mλ = 2dsin(Φ);

[0061] The equation is transformed to obtain: d = mλ / 2;

[0062] Where m is the diffraction order, d is the period diameter, and λ is the wavelength; for simplified calculation, considering m as first-order diffraction, we can calculate that: d = λ / 2 = 700 / 2 = 350 nm. That is, in order to reflect 700 nm light, the period diameter of the photonic crystal should be set to 350 nm. Similarly, the calculation method for the period diameter of the photonic crystal for light with other wavelengths is the same, and will not be repeated here.

[0063] See Figure 19 When red light and green light combine, yellow is displayed; when red light and blue light combine, magenta is displayed; when green light and blue light combine, cyan is displayed; and when red light, green light, and blue light combine, white is displayed. Therefore, the display colors in the transmission mode are subtractive colors of the three primary colors.

[0064] In one embodiment of this utility model, the photonic crystal layer 14 includes at least a red region 141, a green region 142, and a blue region 143. The two-dimensional photonic crystal in the red region 141 reflects red light and transmits other light. In transmission mode, the transmitted light lacks red light, so the transmitted color is cyan. In reflection mode, the reflected color is red. The two-dimensional photonic crystal in the green region 142 reflects green light and transmits other light. In transmission mode, the transmitted light lacks green light, so the transmitted color is magenta. In reflection mode, the reflected color is green. The two-dimensional photonic crystal in the blue region 143 reflects blue light and transmits other light. In transmission mode, the transmitted light lacks blue light, so the transmitted color is yellow. In reflection mode, the reflected color is blue.

[0065] See Figure 17 As an embodiment of this utility model, multiple red zones 141, green zones 142, and blue zones 143 are provided. Each red zone 141 is adjacent to a blue zone 143 and a green zone 142, each green zone 142 is adjacent to a red zone 141 and a blue zone 143, and each blue zone 143 is adjacent to a red zone 141 and a green zone 142. That is, the red zones 141, green zones 142, and blue zones 143 are arranged in sequence and repeatedly to achieve a uniform distribution of display colors.

[0066] In one embodiment of this utility model, a circular polarizer 4 is provided on the side of the first substrate 11 away from the first liquid crystal layer 12; a first linear polarizer 5 is provided between the second substrate 13 and the third substrate 21; and a second linear polarizer 6 is provided between the fourth substrate 23 and the backlight module 3. The circular polarizer 4 consists of a linear polarizer and a quarter-wave plate. Through the combined action of the circular polarizer 4, the first linear polarizer 5, and the second linear polarizer 6, the light emitted from the backlight module 3 can be converted into light with the desired polarization direction, meeting the user's display requirements. However, the polarization directions of the circular polarizer 4, the first linear polarizer 5, and the second linear polarizer 6 can all be adjusted. The appropriate polarization direction can be adjusted according to specific usage requirements. By changing the liquid crystal arrangement direction in the first liquid crystal layer 12 and the second liquid crystal layer 22, and in conjunction with the circular polarizer 4, the first linear polarizer 5, and the second linear polarizer 6, it is possible to switch between the bright and dark states of the transmissive display, and at the same time, it is also possible to switch between the bright and dark states of the reflective display, thereby meeting the user's display needs for a high-quality visual experience and improving the applicability.

[0067] See Figure 1 In one embodiment of this utility model, a color filter substrate is provided and disposed between the first liquid crystal layer 12 and the second substrate 13. A photonic crystal layer 14 is provided on the color filter substrate. The absorption axis angles of the circular polarizer 4 and the first linear polarizer 5 are the same or orthogonal, and the absorption axis angles of the circular polarizer 4 and the second linear polarizer 6 are the same or orthogonal. That is, there are the following four structures, and their transmission modes and reflection modes are described below:

[0068] Structure 1: The absorption axis angles of the circular polarizer 4 and the first linear polarizer 5 are the same, and the absorption axis angles of the first linear polarizer 5 and the second linear polarizer 6 are orthogonal. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as planar conversion liquid crystal (IPS), the absorption axis of the circular polarizer 4 and the first linear polarizer 5 is 0°, and the absorption axis of the second linear polarizer 6 is 90° as an example, wherein the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate;

[0069] See Figure 2 Transmission mode:

[0070] Bright state: The light (white light) emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in the powered state. The 0° linearly polarized light rotates 90° after passing through the long axis of the liquid crystal molecules, and is converted into 90° linearly polarized light. It then passes through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the red area 141 as an example, the red light is reflected and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in the unpowered state. The 90° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 90° linearly polarized light. Finally, it reaches and passes through the circular polarizer 4, and is converted into right-hand circularly polarized light, displaying cyan, thus achieving the bright state.

[0071] Dark state: The light emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 0° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 0° linearly polarized light. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0072] See Figure 3 Reflection mode:

[0073] Bright state: Ambient light (white light) is converted into right-hand circularly polarized light after passing through the circular polarizer 4 (first converted into 90° linearly polarized light by passing through a 0° linear polarizer, and then converted into right-hand circularly polarized light by passing through a quarter-wave plate). At this time, the first liquid crystal layer 12 is in an energized state. The right-hand circularly polarized light is converted into 0° linearly polarized light after passing through the long axis of the liquid crystal molecules and reaches the photonic crystal layer. Taking the red region 141 as an example, the red light is reflected. The linearly polarized light does not change its polarization state after being reflected by the photonic crystal layer, that is, it is still 0° linearly polarized light. After passing through the first liquid crystal layer 12 again, it is converted into right-hand circularly polarized light. Finally, it returns and passes through the circular polarizer 4, and is converted into 90° linearly polarized light (first converted into 90° linearly polarized light by passing through a quarter-wave plate, and then passed through a 0° linear polarizer), displaying red and realizing the bright state.

[0074] Dark state: Ambient light (white light) is converted into right-hand circularly polarized light after passing through the circular polarizer 4 (first converted into 90° linearly polarized light by a 0° linear polarizer, and then converted into right-hand circularly polarized light by a quarter-wave plate). At this time, the first liquid crystal layer 12 is in an uncharged state. The right-hand circularly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still right-hand circularly polarized light. When it reaches the photonic crystal layer, the circularly polarized light changes its polarization direction after being reflected by the photonic crystal layer, that is, the right-hand circularly polarized light is converted into left-hand circularly polarized light. After passing through the first liquid crystal layer 12 again, it is still left-hand circularly polarized light. Finally, it returns to the circular polarizer 4 and is absorbed by the circular polarizer 4 (first converted into 0° linearly polarized light by a quarter-wave plate, and then absorbed by a linear polarizer), thus realizing the dark state.

[0075] Structure 2: The absorption axis angles of the circular polarizer 4 and the second linear polarizer 6 are the same, and the absorption axis angles of the first linear polarizer 5 and the second linear polarizer 6 are orthogonal. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as planar conversion liquid crystal (IPS), the absorption axis of the circular polarizer 4 and the second linear polarizer 6 is 0°, and the absorption axis of the first linear polarizer 5 is 90° as an example, wherein the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate;

[0076] See Figure 4 Transmission mode:

[0077] Bright state: The light (white light) emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in the powered state. The 90° linearly polarized light is rotated 90° after passing through the long axis of the liquid crystal molecules, and is converted into 0° linearly polarized light. It then passes through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the red area 141 as an example, the red light is reflected and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in the powered state. The 0° linearly polarized light is converted into 90° linearly polarized light after passing through the long axis of the liquid crystal molecules. Finally, it reaches and passes through the circular polarizer 4, and is converted into right-hand circularly polarized light, displaying cyan, thus achieving the bright state.

[0078] Dark state: The light emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 90° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 90° linearly polarized light. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0079] Reflection mode: The light path changes in the bright and dark states are the same as in structure one, and will not be repeated here.

[0080] Structure 3: The absorption axis angles of the circular polarizer 4 and the first linear polarizer 5 are orthogonal, and the absorption axis angles of the first linear polarizer 5 and the second linear polarizer 6 are the same. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as planar conversion liquid crystals (IPS), the absorption axis of the circular polarizer 4 is 0°, and the absorption axes of the first linear polarizer 5 and the second linear polarizer 6 are 90° as an example, wherein the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate;

[0081] See Figure 5 Transmission mode:

[0082] Bright state: The light (white light) emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 0° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 0° linearly polarized light. Thus, it passes through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the red area 141 as an example, the red light is reflected, and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in a powered state. The 0° linearly polarized light is converted into 90° linearly polarized light after passing through the long axis of the liquid crystal molecules. Finally, it reaches and passes through the circular polarizer 4, and is converted into right-hand circularly polarized light, displaying cyan, thus achieving the bright state.

[0083] Dark state: The light emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an energized state. The 0° linearly polarized light is converted into 90° linearly polarized light after passing through the long axis of the liquid crystal molecules. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0084] Reflection mode: The light path changes in the bright and dark states are the same as in structure one, and will not be repeated here.

[0085] Structure 4: The absorption axis angles of the circular polarizer 4, the first linear polarizer 5, and the second linear polarizer 6 are all the same. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as planar conversion liquid crystals (IPS), and the absorption axis of the circular polarizer 4, the first linear polarizer 5, and the second linear polarizer 6 as 0°, the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate.

[0086] See Figure 6 Transmission mode:

[0087] Bright state: The light (white light) emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 90° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 90° linearly polarized light. Thus, it passes through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the red area 141 as an example, the red light is reflected, and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in an unpowered state. The 90° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, and it is still 90° linearly polarized light. Finally, it reaches and passes through the circular polarizer 4, and is converted into right-hand circularly polarized light, displaying cyan, thus achieving the bright state.

[0088] Dark state: The light emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an energized state. The 90° linearly polarized light is converted into 0° linearly polarized light after passing through the long axis of the liquid crystal molecules. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0089] Reflection mode: The light path changes in the bright and dark states are the same as in structure one, and will not be repeated here.

[0090] See Figure 7 In one embodiment of this utility model, a color filter substrate is provided and disposed between the third substrate 21 and the second liquid crystal layer 22. A photonic crystal layer 14 is provided on the color filter substrate. The absorption axis angle of the circular polarizer 4 and the first linear polarizer 5 is orthogonal, and the absorption axis angle of the second linear polarizer 6 is the same as that of the circular polarizer 4 or the first linear polarizer 5. That is, there are two structures, and their transmission mode and reflection mode are described below:

[0091] Structure 5: The absorption axis angles of the circular polarizer 4 and the second linear polarizer 6 are the same, and the absorption axis angles of the first linear polarizer 5 and the second linear polarizer 6 are orthogonal. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as planar conversion liquid crystal (IPS), the absorption axis of the circular polarizer 4 and the second linear polarizer 6 is 0°, and the absorption axis of the first linear polarizer 5 is 90° as an example, wherein the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate;

[0092] See Figure 8 Transmission mode:

[0093] Bright state: The light (white light) emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in the powered state. The 90° linearly polarized light is rotated 90° after passing through the long axis of the liquid crystal molecules, and is converted into 0° linearly polarized light. It then passes through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the red area 141 as an example, the red light is reflected and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in the powered state. The 0° linearly polarized light is converted into 90° linearly polarized light after passing through the long axis of the liquid crystal molecules. Finally, it reaches and passes through the circular polarizer 4, and is converted into right-hand circularly polarized light, displaying cyan, thus achieving the bright state.

[0094] Dark state: The light emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 90° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 90° linearly polarized light. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0095] See Figure 9 Reflection mode:

[0096] Bright state: Ambient light (white light) is converted into right-hand circularly polarized light after passing through the circular polarizer 4 (first converted into 90° linearly polarized light by passing through the 0° linear polarizer, and then converted into right-hand circularly polarized light by passing through the quarter-wave plate). At this time, the first liquid crystal layer 12 is in an energized state. The right-hand circularly polarized light is converted into 0° linearly polarized light after passing through the long axis of the liquid crystal molecules, and then passes through the first linear polarizer 5 to reach the photonic crystal layer. Taking the red region 141 as an example, the red light is reflected. The linearly polarized light does not change its polarization state after being reflected by the photonic crystal layer, that is, it is still 0° linearly polarized light. It passes through the first linear polarizer 5 again and passes through the first liquid crystal layer 12 to be converted into right-hand circularly polarized light. Finally, it returns and passes through the circular polarizer 4 to be converted into 90° linearly polarized light (first converted into 90° linearly polarized light by passing through the quarter-wave plate, and then passed through the 0° linear polarizer), displaying red and realizing the bright state.

[0097] Dark state: Ambient light (white light) is converted into right-hand circularly polarized light after passing through the circular polarizer 4 (first converted into 90° linearly polarized light by a 0° linear polarizer, and then converted into right-hand circularly polarized light by a quarter-wave plate). At this time, the first liquid crystal layer 12 is in an uncharged state. The right-hand circularly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still right-hand circularly polarized light. When it reaches the photonic crystal layer, the circularly polarized light changes its polarization direction after being reflected by the photonic crystal layer, that is, the right-hand circularly polarized light is converted into left-hand circularly polarized light. After passing through the first liquid crystal layer 12 again, it is still left-hand circularly polarized light. Finally, it returns to the circular polarizer 4 and is absorbed by the circular polarizer 4 (first converted into 0° linearly polarized light by a quarter-wave plate, and then absorbed by a linear polarizer), thus realizing the dark state.

[0098] Structure 6: The absorption axes of the circular polarizer 4 and the second linear polarizer 6 are orthogonal, and the absorption axes of the first linear polarizer 5 and the second linear polarizer 6 are the same. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as planar conversion liquid crystals (IPS), the absorption axis of the circular polarizer 4 is 0°, and the absorption axes of the first linear polarizer 5 and the second linear polarizer 6 are 90° as an example, wherein the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate;

[0099] See Figure 10 Transmission mode:

[0100] Bright state: The light (white light) emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 0° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 0° linearly polarized light. Thus, it passes through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the red area 141 as an example, the red light is reflected, and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in a powered state. The 0° linearly polarized light is converted into 90° linearly polarized light after passing through the long axis of the liquid crystal molecules. Finally, it reaches and passes through the circular polarizer 4, and is converted into right-hand circularly polarized light, displaying cyan, thus achieving the bright state.

[0101] Dark state: The light emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an energized state. The 0° linearly polarized light is converted into 90° linearly polarized light after passing through the long axis of the liquid crystal molecules. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0102] Reflection mode: The light path change process in bright and dark states is the same as in structure five, and will not be repeated here.

[0103] See Figure 11 In one embodiment of this utility model, both the first liquid crystal module 1 and the second liquid crystal module 2 are provided with color filter substrates. A photonic crystal layer 14 is provided on the color filter substrate, which is respectively the first color filter substrate and the second color filter substrate. The first color filter substrate is disposed between the first liquid crystal layer 12 and the second substrate 13, and the second color filter substrate is disposed between the third substrate 21 and the second liquid crystal layer 22. The absorption axis angles of the circular polarizer 4 and the first linear polarizer 5 are the same or orthogonal, and the absorption axis angles of the circular polarizer 4 and the second linear polarizer 6 are the same or orthogonal. Thus, there are four structures, and their transmission and reflection modes are described below:

[0104] Structure 7: The absorption axis angles of the circular polarizer 4 and the first linear polarizer 5 are the same, and the absorption axis angles of the first linear polarizer 5 and the second linear polarizer 6 are orthogonal. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as planar conversion liquid crystal (IPS), the absorption axis of the circular polarizer 4 and the first linear polarizer 5 is 0°, and the absorption axis of the second linear polarizer 6 is 90° as an example, wherein the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate;

[0105] See Figure 12 Transmission mode:

[0106] Bright state: The light (white light) emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in the powered state. The 0° linearly polarized light rotates 90° after passing through the long axis of the liquid crystal molecules and is converted into 90° linearly polarized light. Taking the red area 141 as an example, the red light is reflected and other light passes through the photonic crystal layer, then through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the green area 142 as an example, the green light is reflected and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in the unpowered state. The 90° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 90° linearly polarized light. Finally, it reaches and passes through the circular polarizer 4 and is converted into right-hand circularly polarized light, displaying blue, thus achieving the bright state.

[0107] Dark state: The light emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 0° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 0° linearly polarized light. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0108] See Figure 13 Reflection mode:

[0109] Bright state: Ambient light (white light) is converted into right-hand circularly polarized light after passing through the circular polarizer 4 (first converted into 90° linearly polarized light by passing through the 0° linear polarizer, and then converted into right-hand circularly polarized light by passing through the quarter-wave plate). At this time, the first liquid crystal layer 12 is in the powered state. The right-hand circularly polarized light is converted into 0° linearly polarized light after passing through the long axis of the liquid crystal molecules and reaches the photonic crystal layer. Taking the red region 141 as an example, the red light is reflected, and other light passes through and is absorbed by the first linear polarizer 5. The linearly polarized light does not change its polarization state after being reflected by the photonic crystal layer, that is, it is still 0° linearly polarized light. After passing through the first liquid crystal layer 12 again, it is converted into right-hand circularly polarized light. Finally, it returns and passes through the circular polarizer 4, and is converted into 90° linearly polarized light (first converted into 90° linearly polarized light by passing through the quarter-wave plate, and then passed through the 0° linear polarizer), displaying red and realizing the bright state.

[0110] Dark state: Ambient light (white light) is converted into right-handed circularly polarized light after passing through the circular polarizer 4 (first converted into 90° linearly polarized light by a 0° linear polarizer, then converted into right-handed circularly polarized light by a quarter-wave plate). At this time, the first liquid crystal layer 12 is in an uncharged state. The right-handed circularly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still right-handed circularly polarized light. When it reaches the photonic crystal layer, taking the red region 141 as an example, red light is reflected, while other light passes through. The circularly polarized light changes its polarization direction after being reflected by the photonic crystal layer, that is, the right-handed circularly polarized light is converted into left-handed circularly polarized light. After passing through the first liquid crystal layer 12 again, the light is still left-handed circularly polarized. Finally, it returns to the circular polarizer 4 and is absorbed by the circular polarizer 4 (first passing through a quarter-wave plate to be converted into 0° linearly polarized light, and then being absorbed by the linear polarizer). Other light reaches the photonic crystal layer on the second color filter substrate. Taking the green area 142 as an example, the green light is reflected, and other light passes through. The polarization direction of the reflected light is converted into left-handed circularly polarized light. Finally, it returns to the circular polarizer 4 and is absorbed by the circular polarizer 4 (first passing through a quarter-wave plate to be converted into 0° linearly polarized light, and then being absorbed by the linear polarizer), thus achieving the dark state.

[0111] Structure 8: The absorption axis angles of the circular polarizer 4 and the second linear polarizer 6 are the same, and the absorption axis angles of the first linear polarizer 5 and the second linear polarizer 6 are orthogonal. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as planar conversion liquid crystal (IPS), the absorption axis of the circular polarizer 4 and the second linear polarizer 6 is 0°, and the absorption axis of the first linear polarizer 5 is 90° as an example, wherein the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate;

[0112] See Figure 14 Transmission mode:

[0113] Bright state: The light (white light) emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in the powered state. The 90° linearly polarized light rotates 90° after passing through the long axis of the liquid crystal molecules and is converted into 0° linearly polarized light. Taking the red area 141 as an example, the red light is reflected and other light passes through the photonic crystal layer, then through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the green area 142 as an example, the green light is reflected and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in the powered state. The 0° linearly polarized light is converted into 90° linearly polarized light after passing through the long axis of the liquid crystal molecules. Finally, it reaches and passes through the circular polarizer 4 and is converted into right-hand circularly polarized light, displaying blue and realizing the bright state.

[0114] Dark state: The light emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 90° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 90° linearly polarized light. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0115] Reflection mode: The light path changes in the bright and dark states are the same as in structure seven, and will not be repeated here.

[0116] Structure 9: The absorption axis angles of the circular polarizer 4 and the first linear polarizer 5 are orthogonal, and the absorption axis angles of the first linear polarizer 5 and the second linear polarizer 6 are the same. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as planar conversion liquid crystals (IPS), the absorption axis of the circular polarizer 4 is 0°, and the absorption axes of the first linear polarizer 5 and the second linear polarizer 6 are 90° as an example, wherein the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate;

[0117] See Figure 15 Transmission mode:

[0118] Bright state: The light (white light) emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 0° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 0° linearly polarized light. Taking the red area 141 as an example, the red light is reflected, and other light passes through the photonic crystal layer, then through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the green area 142 as an example, the green light is reflected, and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in a powered state. The 0° linearly polarized light is converted into 90° linearly polarized light after passing through the long axis of the liquid crystal molecules, and finally reaches and passes through the circular polarizer 4, and is converted into right-hand circularly polarized light, displaying blue, thus achieving the bright state.

[0119] Dark state: The light emitted by the backlight module 3 is converted into 0° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an energized state. The 0° linearly polarized light is converted into 90° linearly polarized light after passing through the long axis of the liquid crystal molecules. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0120] Reflection mode: The light path changes in the bright and dark states are the same as in structure seven, and will not be repeated here.

[0121] Structure 10: The absorption axis angles of the circular polarizer 4, the first linear polarizer 5, and the second linear polarizer 6 are all the same. Taking the first liquid crystal layer 12 and the second liquid crystal layer 22 as both being planar conversion liquid crystals (IPS), and the absorption axes of the circular polarizer 4, the first linear polarizer 5, and the second linear polarizer 6 all being 0°, the circular polarizer 4 is composed of a 0° linear polarizer and a 1 / 4 wave plate.

[0122] See Figure 16 Transmission mode:

[0123] Bright state: The light (white light) emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an unpowered state. The 90° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, that is, it is still 90° linearly polarized light. Taking the red area 141 as an example, the red light is reflected, and other light passes through the photonic crystal layer, then through the first linear polarizer 5 and enters the first liquid crystal module 1. Taking the green area 142 as an example, the green light is reflected, and other light passes through the photonic crystal layer. At this time, the first liquid crystal layer 12 is in an unpowered state. The 90° linearly polarized light does not change its polarization state after passing through the short axis of the liquid crystal molecules, and it is still 90° linearly polarized light. Finally, it reaches and passes through the circular polarizer 4, and is converted into right-hand circularly polarized light, displaying blue, thus achieving the bright state.

[0124] Dark state: The light emitted by the backlight module 3 is converted into 90° linearly polarized light after passing through the second linear polarizer 6. At this time, the second liquid crystal layer 22 is in an energized state. The 90° linearly polarized light is converted into 0° linearly polarized light after passing through the long axis of the liquid crystal molecules. After reaching the first linear polarizer 5, it is absorbed and cannot pass through the first liquid crystal module 1, thus achieving the dark state.

[0125] Reflection mode: The light path changes in the bright and dark states are the same as in structure seven, and will not be repeated here.

[0126] See Figure 18 As an embodiment of the present invention, the color distribution of the photonic crystal layer on the first color filter substrate is interleaved with the color distribution of the photonic crystal layer on the second color filter substrate, that is, one color area on the first color filter substrate corresponds to another color area on the second color filter substrate, thereby further realizing full-color display. Preferably, the red area 141 on the first color filter substrate corresponds to the blue area 143 on the second color filter substrate, the blue area 143 on the first color filter substrate corresponds to the green area 142 on the second color filter substrate, and the green area 142 on the first color filter substrate corresponds to the red area 141 on the second color filter substrate.

[0127] The display principle of a single-layer photonic crystal layer:

[0128] Transmission mode: When red is transmitted, the output color is cyan; when green is transmitted, the output color is magenta; when blue is transmitted, the output color is yellow.

[0129] Reflection mode: The reflected color is the same as its original color;

[0130] Use case: When color accuracy is not critical or when the transmissive mode is used only occasionally.

[0131] The display principle of a double-layer photonic crystal layer:

[0132] Transmission mode: When red and blue are transmitted, the output color is green; when red and green are transmitted, the output color is blue; when blue and green are transmitted, the output color is red.

[0133] Reflection mode: The reflected color is the same as its original color;

[0134] Use case: Suitable for all scenarios.

[0135] This utility model provides a display device, including the display panel as described above, which adopts an integrated structure of transmission and reflection, and can realize both reflective and transmission display at the same time. Through the semi-transparent and semi-reflective display function, it can save power consumption and meet the needs of different scenarios, solving the problem of poor display effect of conventional reflective architecture at night; by realizing the transmission and reflection of light through photonic crystal, it can realize full-color display and meet the user's display needs for high-quality visual experience.

[0136] In summary, this invention provides a display panel and display device that adopts an integrated transmission and reflection structure, enabling simultaneous reflection and transmission display. Through its semi-transparent and semi-reflective display function, it saves power consumption and meets the needs of different scenarios, solving the problem of poor display performance at night in conventional reflective architectures. By using photonic crystals to achieve light transmission and reflection, it enables full-color display, meeting users' demands for a high-quality visual experience. Furthermore, by utilizing photonic crystals to reflect light, this invention eliminates the need for the metal reflective layer required in conventional reflective architectures. In addition, compared to conventional full-color reflective architectures, it reduces the cell thickness by one layer, thereby lowering costs.

[0137] It should be emphasized that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model in any way. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A display panel, characterized in that, It includes a first liquid crystal module (1), a second liquid crystal module (2), and a backlight module (3) stacked together. The first liquid crystal module (1) includes a first substrate (11), a first liquid crystal layer (12), and a second substrate (13) stacked in sequence. The second liquid crystal module (2) includes a third substrate (21), a second liquid crystal layer (22), and a fourth substrate (23) stacked in sequence. Wherein, the second substrate (13) is adjacent to the third substrate (21), and the fourth substrate (23) is adjacent to the backlight module (3); The first liquid crystal module (1) and / or the second liquid crystal module (2) are provided with a color filter substrate, and a photonic crystal layer (14) is provided on the color filter substrate. The photonic crystal layer (14) reflects or transmits light of different wavelengths.

2. The display panel according to claim 1, characterized in that, The photonic crystal layer (14) includes several two-dimensional photonic crystals.

3. The display panel according to claim 1, characterized in that, The photonic crystal layer (14) includes at least a red region (141), a green region (142), and a blue region (143). The two-dimensional photonic crystal in the red region (141) reflects red light and transmits other light, the two-dimensional photonic crystal in the green region (142) reflects green light and transmits other light, and the two-dimensional photonic crystal in the blue region (143) reflects blue light and transmits other light.

4. The display panel according to claim 3, characterized in that, There are multiple red zones (141), green zones (142), and blue zones (143). Each red zone (141) is adjacent to one blue zone (143) and one green zone (142). Each green zone (142) is adjacent to one red zone (141) and one blue zone (143). Each blue zone (143) is adjacent to one red zone (141) and one green zone (142).

5. The display panel according to any one of claims 1-4, characterized in that, A circular polarizer (4) is provided on the side of the first substrate (11) away from the first liquid crystal layer (12), a first linear polarizer (5) is provided between the second substrate (13) and the third substrate (21), and a second linear polarizer (6) is provided between the fourth substrate (23) and the backlight module (3).

6. The display panel according to claim 5, characterized in that, The color filter substrate is provided and disposed between the first liquid crystal layer (12) and the second substrate (13). The absorption axis angle of the circular polarizer (4) is the same as or orthogonal to that of the first linear polarizer (5). The absorption axis angle of the circular polarizer (4) is the same as or orthogonal to that of the second linear polarizer (6).

7. The display panel according to claim 5, characterized in that, The color filter substrate is provided and disposed between the third substrate (21) and the second liquid crystal layer (22). The absorption axis angle of the circular polarizer (4) and the first linear polarizer (5) is orthogonal. The absorption axis angle of the second linear polarizer (6) is the same as that of the circular polarizer (4) or the first linear polarizer (5).

8. The display panel according to claim 5, characterized in that, Both the first liquid crystal module (1) and the second liquid crystal module (2) are provided with color filter substrates, namely the first color filter substrate and the second color filter substrate. The first color filter substrate is disposed between the first liquid crystal layer (12) and the second substrate (13), and the second color filter substrate is disposed between the third substrate (21) and the second liquid crystal layer (22). The absorption axis angle of the circular polarizer (4) is the same as or orthogonal to that of the first linear polarizer (5), and the absorption axis angle of the circular polarizer (4) is the same as or orthogonal to that of the second linear polarizer (6).

9. The display panel according to claim 8, characterized in that, The red area (141) on the first color filter substrate corresponds to the blue area (143) on the second color filter substrate, the blue area (143) on the first color filter substrate corresponds to the green area (142) on the second color filter substrate, and the green area (142) on the first color filter substrate corresponds to the red area (141) on the second color filter substrate.

10. A display device, characterized in that, Includes the display panel as described in any one of claims 1-9.

Images