Display panel and display device

Abstract

The embodiments of the present disclosure provide a display panel and a display device, which relate to the field of display technology and can improve contrast. The display panel includes a liquid crystal box, an optical layer, a first polarizing structure, and a second polarizing structure. The liquid crystal box includes a first substrate and a second substrate arranged opposite to each other and a liquid crystal layer sandwiched therebetween. The optical layer is on a side of the first substrate away from the second substrate, transmits light whose polarization direction is parallel to the transmission axis of the optical layer in the incident light, and reflects the remaining light. The first polarizing structure is on a side of the optical layer away from the liquid crystal box, transmits light whose polarization direction is parallel to the transmission axis of the first polarizing structure in the incident light, and absorbs the remaining light. The second polarizing structure is on a side of the liquid crystal box away from the optical layer, transmits light whose polarization direction is parallel to the transmission axis of the second polarizing structure in the incident light, and absorbs the remaining light. The transmission axis of the first polarizing structure is perpendicular to the transmission axis of the optical layer, and the transmission axis of the second polarizing structure is perpendicular or parallel to the transmission axis of the optical layer.

Description

Technical Field

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

[0002] Reflective display devices mainly use ambient light as a light source, and reflect the ambient light incident on the inside of the display device to achieve a display effect. Generally, a backlight module is not required to provide a light source. It is a relatively energy-saving and environmentally friendly display method with a long service life. Summary of the invention

[0003] Embodiments of the present disclosure provide a display panel and a display device, which can improve contrast.

[0004] To achieve the above objectives, the embodiments of the present disclosure adopt the following technical solutions:

[0005] In one aspect, a display panel is provided. The display panel includes a liquid crystal box, an optical layer, a first polarizing structure, and a second polarizing structure. The liquid crystal box includes a first substrate, a second substrate, and a liquid crystal layer. The first substrate and the second substrate are arranged opposite to each other, and the liquid crystal layer is sandwiched between the first substrate and the second substrate. The optical layer is arranged on a side of the first substrate of the liquid crystal box away from the second substrate. The optical layer is configured to transmit light whose polarization direction is parallel to the transmission axis of the optical layer among the light incident to the optical layer, and reflect the rest of the light. The first polarizing structure is arranged on a side of the optical layer away from the liquid crystal box. The first polarizing structure is configured to transmit light whose polarization direction is parallel to the transmission axis of the first polarizing structure among the light incident to the first polarizing structure, and absorb the rest of the light. The second polarizing structure is arranged on a side of the liquid crystal box away from the optical layer. The second polarizing structure is configured to transmit light whose polarization direction is parallel to the transmission axis of the second polarizing structure among the light incident to the second polarizing structure, and absorb the rest of the light. The transmission axis of the first polarizing structure is perpendicular to the transmission axis of the optical layer, and the transmission axis of the second polarizing structure is perpendicular or parallel to the transmission axis of the optical layer.

[0006] In some embodiments, the transmission axis of the second polarizing structure is parallel to the transmission axis of the first polarizing structure.

[0007] In some embodiments, the optical layer includes a plurality of first optical films and a plurality of second optical films. The plurality of first optical films are birefringent. The plurality of second optical films are unirefringent. Each first optical film and each second optical film are alternately stacked in a direction perpendicular to the plane where the display panel is located.

[0008] In some embodiments, one of the first optical film and the second optical film is directly bonded to the first polarizing structure.

[0009] In some embodiments, along a first direction in the plane where the optical layer is located, the refractive index of the first optical film is greater than the refractive index of the second optical film. Along a second direction in the plane where the optical layer is located, the refractive index of the first optical film is equal to the refractive index of the second optical film; the first direction and the second direction are perpendicular.

[0010] In some embodiments, the transmission axis of the optical layer is 0° to 180°; the transmission axis of the optical layer is parallel to the plane where the display panel is located.

[0011] In some embodiments, the display panel further comprises a scattering film, wherein the scattering film is disposed on a side of the liquid crystal cell close to the optical layer and is located between the liquid crystal cell and the optical layer.

[0012] In some embodiments, the optical layer includes: a plurality of first optical films and a plurality of second optical films. The plurality of first optical films are birefringent, and the plurality of second optical films are unirefringent. Each first optical film and each second optical film are alternately stacked in a direction perpendicular to the plane where the display panel is located. One of the first optical film and the second optical film is directly bonded to the scattering film.

[0013] In some other embodiments, the display panel further comprises a scattering film, and the scattering film is disposed on a side of the liquid crystal cell away from the optical layer.

[0014] In some embodiments, the diffusion axis of the scattering film is 0° to 90°, and the angle between the diffusion axis and the direction perpendicular to the plane where the display panel is located is 0° to 75°.

[0015] In some embodiments, the display panel further comprises an anti-reflection film. The anti-reflection film is disposed on a side of the second polarizing structure away from the optical layer.

[0016] In some embodiments, the liquid crystal box further comprises a first alignment layer and a second alignment layer. The first alignment layer is disposed on the first substrate and close to the liquid crystal layer, and the first alignment layer has a first alignment direction. The second alignment layer is disposed on the second substrate and close to the liquid crystal layer, and the second alignment layer has a second alignment direction. The first alignment direction is parallel or perpendicular to the second alignment direction.

[0017] In some embodiments, the first alignment direction is parallel to the second alignment direction, and the second alignment direction is perpendicular to the transmission axis of the second polarizing structure.

[0018] In some embodiments, the liquid crystal box further comprises a first electrode and a second electrode. The first electrode is disposed on the first substrate. The second electrode is disposed on the first substrate. The first electrode is farther away from the liquid crystal layer than the second electrode, the second electrode is a slit electrode, and the first electrode is a planar electrode.

[0019] In some embodiments, the first alignment direction is perpendicular to the second alignment direction, and the second alignment direction is parallel to the transmission axis of the second polarizing structure. The liquid crystal box further includes a first electrode and a second electrode. The first electrode is disposed on the first substrate; the second electrode is disposed on the second substrate, and both the first electrode and the second electrode are planar electrodes.

[0020] In some embodiments, the liquid crystal box further comprises a plurality of filter layers. The plurality of filter layers are disposed on the second substrate and close to a side of the liquid crystal layer. The thickness of the plurality of filter layers is 0.3 μm to 3 μm.

[0021] In some embodiments, the liquid crystal box further includes an electrostatic shielding pattern. The electrostatic shielding pattern is disposed on the second substrate and close to a side of the liquid crystal layer.

[0022] In another aspect, a display device is provided, comprising: a display panel as described in any one of the above embodiments.

[0023] In some embodiments, the display device further comprises a data processor. The data processor is coupled to the display panel. The data processor is configured to invert the input first image data to obtain second image data. The display panel is configured to display an image according to the second image data.

[0024] Therefore, the embodiments of the present disclosure provide a display panel and a display device, so that the ambient light obtains linearly polarized light after passing through the second polarization structure in the display panel, and the linearly polarized light is irradiated on the optical layer after passing through the liquid crystal box. The optical layer transmits the light whose polarization direction is parallel to the transmission axis of the optical layer among the light incident on the optical layer, and reflects the remaining light (i.e., the light whose polarization direction is not parallel to the transmission axis of the optical layer). The light transmitted from the optical layer irradiates the surface of the first polarizer and is absorbed by the first polarizer, and the display panel is in a dark state at this time. The light reflected from the optical layer is directed to the liquid crystal box and emitted from the liquid crystal box, and the display panel is in a bright state at this time. In this way, the reflectivity of the light can be improved in the bright state, and the light is absorbed by the first polarizer in the dark state, which can avoid the reflection of the light. Compared with the display device provided with a reflective layer, the brightness of the display panel in the dark state is reduced, thereby improving the contrast of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present disclosure, the following briefly introduces the drawings required to be used in some embodiments of the present disclosure. Obviously, the drawings described below are only drawings of some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can also be obtained based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams, and are not limitations on the actual size of the product involved in the embodiments of the present disclosure, the actual process of the method, the actual timing of the signal, etc.

[0026] Figure 1 is a structural diagram of a display device according to some embodiments;

[0027] Figure 2 is a structural diagram of a display panel according to some embodiments;

[0028] Figure 3A is a structural diagram of a liquid crystal cell according to some embodiments;

[0029] Figure 3B is another structural diagram of a liquid crystal cell according to some embodiments;

[0030] Figure 3C for Figure 3B A cross-sectional view of the liquid crystal cell along the AA' direction;

[0031] Figure 3D for Figure 3B A cross-sectional view of the liquid crystal cell along the BB' direction;

[0032] Figure 3E is another structural diagram of a liquid crystal cell according to some embodiments;

[0033] Figure 3F for Figure 3E A cross-sectional view of the liquid crystal cell along the CC' direction;

[0034] Figure 3G for Figure 3E A cross-sectional view of the liquid crystal cell along the D-D' direction;

[0035] Figure 4 is a light path diagram of a display panel according to some embodiments;

[0036] Figure 5 is another light path diagram of a display panel according to some embodiments;

[0037] Fig. 6A is a structural diagram of an optical layer according to some embodiments;

[0038] Figure 6B is another structural diagram of an optical layer according to some embodiments;

[0039] Fig. 7A is another structural diagram of a display panel according to some embodiments;

[0040] Figure 7B for Fig. 7A An exploded view of the display panel;

[0041] Fig. 8A is another structural diagram of a display panel according to some embodiments;

[0042] Figure 8B for Fig. 8A An exploded view of the display panel;

[0043] Fig.9A is a structural diagram of a scattering film according to some embodiments;

[0044] Fig. 9B is another structural diagram of a scattering film according to some embodiments;

[0045] Fig. 9C is another structural diagram of a scattering film according to some embodiments;

[0046] Fig.9D is a schematic diagram of an application scenario of a display device according to some embodiments;

[0047] Fig.10 is a schematic diagram of detecting reflected light from a display panel according to some embodiments;

[0048] Fig.11 is another structural diagram of a display panel according to some embodiments;

[0049] Fig.12 is another structural diagram of a display panel according to some embodiments;

[0050] Fig.13 is a graph showing the relationship between the thickness of the filter layer and the color gamut, reflectivity and contrast ratio in display panels of different sizes according to some embodiments;

[0051] Fig.14 A process diagram of data processing for displaying an image according to some embodiments. DETAILED DESCRIPTION

[0052] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in some embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments provided by the present disclosure, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present disclosure.

[0053] Unless the context requires otherwise, throughout the specification and claims, the term "comprise" and other forms thereof, such as the third person singular form "comprises" and the present participle form "comprising", are to be interpreted as open, inclusive, that is, "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present disclosure. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics may be included in any one or more embodiments or examples in any appropriate manner.

[0054] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0055] When describing some embodiments, the expressions "coupled" and "connected" and their derivatives may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. For another example, when describing some embodiments, the term "coupled" may be used to indicate that two or more components are in direct physical or electrical contact. However, the term "coupled" or "communicatively coupled" may also refer to two or more components that are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0056] The use of "adapted to" or "configured to" herein is meant to be open and inclusive language that does not exclude devices adapted or configured to perform additional tasks or steps.

[0057] As used herein, "about" or "approximately" includes the stated value and the average value that is within an acceptable range of deviation from the particular value, where the acceptable range of deviation is determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0058] Exemplary embodiments are described herein with reference to cross-sectional views and / or plan views that are idealized exemplary drawings. In the drawings, the thickness of layers and regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing. For example, an etched region shown as a rectangle will typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0059] An embodiment of the present disclosure provides a display device. The display device is a fully reflective display device. Exemplarily, the display device is a reflective display device. The display device is any device that displays images, whether in motion (e.g., video) or fixed (e.g., still images), and whether text or images. For example, the display device may be a smart shelf label, a handheld reader, a fitness device display, an outdoor billboard, etc.

[0060] It should be noted that the embodiments of the present disclosure do not limit the type of display panel, and the type can be selected according to actual needs. For example, the display panel can be a twisted nematic (TN) display panel, an in-plane switching (IPS) display panel, an advanced super-dimensional field switch (ADS) display panel, a fringe field switching (FFS) display panel, or a vertical alignment (VA) display panel.

[0061] Among them, Figure 1 As shown, the display device 200 includes a display panel 100. Figure 2 As shown, the display panel 100 includes a liquid crystal cell 10. The liquid crystal cell 10 includes a first substrate 110, a second substrate 120 and a liquid crystal layer 130. The first substrate 110 and the second substrate 120 are arranged opposite to each other. The liquid crystal layer 130 is sandwiched between the first substrate 110 and the second substrate 120.

[0062] Among them, the liquid crystal layer includes liquid crystal molecules. It should be noted that the embodiments of the present disclosure do not limit the type of liquid crystal molecules, and can be selected according to actual conditions. For example, the liquid crystal molecules can be positive liquid crystal molecules or negative liquid crystal molecules. For example, the liquid crystal molecules can be selected from nematic liquid crystal molecules suitable for TN type display panels, dye liquid crystals, liquid crystal molecules suitable for IPS type display panels, liquid crystal molecules suitable for VA type display panels, liquid crystal molecules suitable for FFS type display panels, or liquid crystal molecules suitable for ADS type display panels. Exemplarily, the liquid crystal layer also includes dye molecules, which include, for example, dichroic dye molecules.

[0063] In some embodiments, Figure 3A As shown, the liquid crystal cell 10 has a display area (Active Area, AA). The AA area includes a plurality of display sub-pixel areas P. The liquid crystal cell 10 also includes a thin film transistor (Thin Film Transistor, TFT) disposed on the first substrate 110. Each display sub-pixel area P is provided with a TFT.

[0064] In some embodiments, Figure 3B As shown, the liquid crystal box 10 further includes a first electrode 140 and a second electrode 150. For example, the first electrode 140 may be a pixel electrode, and the second electrode 150 may be a common electrode. For example, the first electrode 140 and the second electrode 150 may both be located on the first substrate 110, and the first electrode 140 and the second electrode 150 may be located on the same layer or on different layers. In this case, an array substrate including the first substrate 110, the first electrode 140 and the second electrode 150, and an opposing substrate including the second substrate 120 may be obtained; or, the first electrode 140 is located on the first substrate 110, and the second electrode 150 is located on the second substrate 120. In this way, an array substrate including the first substrate 110 and the first electrode 140, and an opposing substrate including the second substrate 120 and the second electrode 150 may be obtained. For example, the liquid crystal layer 130 is sandwiched between the opposing substrate and the array substrate.

[0065] The first electrode 140 is located in each display sub-pixel region P. In the display sub-pixel region P, the TFT is coupled to the first electrode 140 .

[0066] For example, the first electrode 140 and the second electrode 150 are both transparent. The first electrode 140 and the second electrode 150 can both be made of transparent conductive materials, such as metal oxides such as indium tin oxide (ITO) or indium zinc oxide (IZO).

[0067] For example, Figure 3AAs shown, the liquid crystal box 10 includes a plurality of gate lines (G0 to Gn, n is a positive integer, for example, n is 1081), a plurality of data lines (D1 to Dm, m is a positive integer greater than 1, for example, m is 5761) and a common conductive pattern Vcom disposed on a first substrate 110. The gate line is configured to provide a scan signal, the data line is configured to provide a data signal, and the common conductive pattern is configured to provide a common signal Vcom. The TFT is coupled to the gate line and the data line, and the second electrode is coupled to the common conductive pattern. For example, the gate of the TFT is coupled to the gate line, the source of the TFT is coupled to the data line, and the drain of the TFT is coupled to the first electrode. The TFT is turned on in response to the scan signal and transmits the data signal to the first electrode. The common conductive pattern transmits the common signal to the second electrode.

[0068] In some embodiments, FIG. 3B to FIG. 3D As shown, the first electrode 140 and the second electrode 150 may both be located on the first substrate 110, and the first electrode 140 is farther away from the liquid crystal layer 130 than the second electrode 150. The second electrode 150 is a slit electrode, and the first electrode 140 is a planar electrode.

[0069] For example, the second electrode 150 includes a plurality of parts 151, the plurality of parts 151 are arranged at intervals, and a slit is formed between two adjacent parts 151 in the plurality of parts 151. The electric field generated by the edge of the slit electrode and the electric field generated between the slit electrode and the planar electrode can form a multi-dimensional electric field, so that all oriented liquid crystal molecules located between the slit electrodes and directly above the electrodes can rotate, thereby improving the working efficiency of the liquid crystal molecules and increasing the light transmission efficiency.

[0070] In some embodiments, Figures 3E to 3G As shown, the first electrode 140 is located on the first substrate 110, and the second electrode 150 is located on the second substrate 120. The first electrode 140 and the second electrode 150 are both planar electrodes. Exemplarily, the second electrode 150 can be disposed on the entire surface of the second substrate 120.

[0071] In addition, illustratively, Figure 3A As shown, the liquid crystal box 10 also has a plurality of dummy sub-pixel regions Q, and the plurality of dummy sub-pixel regions Q are located outside the AA region. For example, the dummy sub-pixel region Q has the same structure as the display sub-pixel region P, for example, a TFT, a first electrode, and a second electrode are disposed in the dummy sub-pixel region.

[0072] For example, a plurality of virtual sub-pixel regions Q and a plurality of display sub-pixel regions P are arranged in an array. Figure 3AThe sub-pixel regions arranged in a row in the X direction are called sub-pixel regions in the same row. For example, the TFTs in the sub-pixel regions in the same row are coupled to one gate line. For example, the TFTs in the virtual sub-pixel region Q and the display sub-pixel region P in the sub-pixel region in the same row are coupled to one gate line. Figure 3A The sub-pixel regions arranged in a row in the Y direction are called the same column sub-pixel regions. For example, the TFTs in the two adjacent rows of sub-pixel regions in the same column of sub-pixel regions are respectively coupled to two data lines. For example, in the virtual sub-pixel region Q and the display sub-pixel region P in the same column of sub-pixel regions, the TFTs in the odd-numbered rows of sub-pixel regions are coupled to one data line, and the TFTs in the even-numbered rows of sub-pixel regions are coupled to another data line. For example, the common conductive pattern Vcom is coupled to the TFT in the virtual sub-pixel Q. For example, Figure 3C As shown, a semiconductor pattern AT is provided on the side of the data line D close to the first substrate 110, which can reduce the resistance of the data line and improve the signal transmission efficiency. The semiconductor pattern AT is provided in the same layer as the active layer of the TFT and is made of the same material. For example, the semiconductor pattern AT and the active layer of the TFT are in an integrated structure. Figure 3C In the X direction (in the X direction), the width of the semiconductor pattern AT is greater than the width of the data line D.

[0073] In some embodiments, the display device can use external light as a light source by setting a reflective layer, and the reflective layer reflects the light, so that the display device can achieve reflective display. For example, a reflective layer (such as a metal reflective layer) can be set on the substrate (such as the first substrate) where the TFT of the liquid crystal box is located to reflect the light. However, this display device has a low utilization rate of light, relatively poor light transmittance, and a complex preparation process, a long development cycle, poor process stability, and large performance differences between products during mass production. It is mostly used in small-size display products.

[0074] In some embodiments, Figure 2 As shown, the display panel 100 further includes an optical layer 20 , a first polarizing structure 30 and a second polarizing structure 40 .

[0075] The optical layer 20 is disposed on a side of the first substrate 110 of the liquid crystal box 10 away from the second substrate 120. For example, the optical layer 20 is fully bonded to the surface of the first substrate 110 of the liquid crystal box 10 away from the second substrate 120, that is, the optical layer 20 is fully bonded to the outer surface of the first substrate 110 of the liquid crystal box 10, that is, the optical layer is fully bonded to the outer surface of the array substrate of the liquid crystal box; for example, water glue or optical glue can be used in the process to completely bond the optical layer 20 and the liquid crystal box 10 together, so that there is no air between the optical layer 20 and the liquid crystal box 10.

[0076] The optical layer 20 is configured to transmit the light whose polarization direction is parallel to the transmission axis of the optical layer 20 among the light incident to the optical layer 20, and reflect the rest of the light. Exemplarily, the rest of the light includes the light whose polarization direction is perpendicular to the transmission axis of the optical layer 20. Exemplarily, the transmission axis of the optical layer 20 is 0° to 180°, for example, the transmission axis of the optical layer 20 is 15°, 30° or 60°, etc. For example, when the transmission axis of the optical layer 20 is 0°, among the light incident to the optical layer 20, the light whose polarization direction is parallel to 0° is transmitted by the optical layer 20, for example, the light whose polarization direction is 0° is transmitted by the optical layer 20, and the rest of the light is reflected by the optical layer 20, for example, the light whose polarization direction is 90° is reflected by the optical layer 20. For example, when the transmission axis of the optical layer 20 is 90°, among the light incident on the optical layer 20, the light with a polarization direction parallel to 90° is transmitted by the optical layer 20, the light with a polarization direction of 90° is transmitted by the optical layer 20, and the remaining light is reflected by the optical layer 20, for example, the light with a polarization direction of 0° is reflected by the optical layer 20.

[0077] It should be noted that the transmission axis in the text can take the plane where the display panel is located as a reference, for example, the 0° transmission axis is parallel to the plane where the display panel is located, and the 90° transmission axis is parallel to the plane where the display panel is located. In the plane where the display panel is located, the 0° transmission axis and the 90° transmission axis are perpendicular to each other. The plane where the display panel is located can be a plane parallel to the display surface of the display panel; for example, the plane where the display panel is located can be the surface of the first substrate facing the liquid crystal layer.

[0078] The first polarizing structure 30 is disposed on a side of the optical layer 20 away from the liquid crystal cell 10, for example, the optical layer 20 is located between the first polarizing structure 30 and the liquid crystal cell 10. The second polarizing structure 40 is disposed on a side of the liquid crystal cell 10 away from the optical layer 20, for example, the second polarizing structure 40 is disposed on a side of the second substrate 120 of the liquid crystal cell 10 away from the first substrate 110.

[0079] Exemplarily, the first polarizing structure 30 is fully bonded to the surface of the optical layer 20 on the side away from the liquid crystal box 10, and at this time, there is no air between the first polarizing structure 30 and the optical layer 20. The second polarizing structure 40 is fully bonded to the surface of the liquid crystal box 10 on the side away from the optical layer 20, that is, the second polarizing structure 40 is fully bonded to the surface of the second substrate 120 on the side away from the first substrate 110 (the outer surface of the second substrate 120), that is, the second polarizing structure 40 is fully bonded to the outer surface of the opposing substrate of the liquid crystal box 10, and at this time, there is no air between the second polarizing structure 40 and the liquid crystal box 10.

[0080] The first polarizing structure 30 is configured to transmit the light whose polarization direction is parallel to the transmission axis of the first polarizing structure 30 among the light incident to the first polarizing structure 30, and absorb the rest of the light. The second polarizing structure 40 is configured to transmit the light whose polarization direction is parallel to the transmission axis of the second polarizing structure 40 among the light incident to the second polarizing structure 40, and absorb the rest of the light.

[0081] Exemplarily, the first polarization structure and the second polarization structure may be formed by elements including polarizers or metal linear polarizers that can achieve the above functions.

[0082] The transmission axis of the first polarizing structure 30 is perpendicular to the transmission axis of the optical layer 20. The transmission axis of the second polarizing structure 40 is perpendicular to the transmission axis of the optical layer 20. The transmission axis of the first polarizing structure 30 is parallel to the transmission axis of the second polarizing structure 40. For example, when the transmission axis of the optical layer 20 is 0°, the transmission axis of the first polarizing structure 30 is 90°, and the transmission axis of the second polarizing structure 40 is 90°. For example, when the transmission axis of the optical layer 20 is 90°, the transmission axis of the first polarizing structure 30 is 0°, and the transmission axis of the second polarizing structure 40 is 0°.

[0083] Alternatively, the transmission axis of the second polarizing structure 40 is parallel to the transmission axis of the optical layer 20. The transmission axis of the first polarizing structure 30 is perpendicular to the transmission axis of the second polarizing structure 40. For example, when the transmission axis of the optical layer 20 is 0°, the transmission axis of the first polarizing structure 30 is 90°, and the transmission axis of the second polarizing structure 40 is 0°. For example, when the transmission axis of the optical layer 20 is 90°, the transmission axis of the first polarizing structure 30 is 0°, and the transmission axis of the second polarizing structure 40 is 90°.

[0084] It should be noted that the transmission axis of the first polarizing structure 30 , the transmission axis of the second polarizing structure 40 and the transmission axis of the optical layer 20 are all parallel to the plane where the display panel 100 is located.

[0085] For example, reference Figure 4 When the transmission axis of the optical layer 20 is 135°, the transmission axis of the first polarizing structure 30 is 45°, and the transmission axis of the second polarizing structure 40 is 45°, natural light is incident from the side of the second polarizing structure 40 away from the liquid crystal box 10, and after passing through the second polarizing structure 40, light with a polarization direction of 45° is obtained, and the light with a polarization direction of 45° enters the liquid crystal box 10.

[0086] For example, a TN mode liquid crystal cell is used as an example for description. Figure 4In part (A), when no electric field is applied to the liquid crystal molecules in the liquid crystal layer 130, the liquid crystal molecules in the liquid crystal layer 130 are arranged in a spiral in sequence along the thickness direction of the liquid crystal box, and there is an optical rotation effect on the light. When the light with a polarization direction of 45° enters the liquid crystal box 10, after passing through the liquid crystal layer 130, the polarization direction of the light changes, so that the linear polarization light with a polarization direction of 45° becomes a linear polarization light with a polarization direction of 135°, and is emitted to the optical layer 20. Since the transmission axis of the optical layer 20 is 135°, the optical layer 20 transmits the linear polarization light with a polarization direction of 135° to the first polarization structure 30. Since the polarization direction of the light is perpendicular to the transmission axis of the first polarization structure 30, it is absorbed by the first polarization structure 30. At this time, the display panel 100 is in a dark state, and the light does not enter the human eye.

[0087] On this basis, continue to refer to Figure 4 In part (B), an electric field is applied to the liquid crystal molecules in the liquid crystal layer 130. Under the action of the electric field, the long axis direction of the liquid crystal molecules in the liquid crystal layer 130 tends to be arranged parallel to the electric field direction. At this time, the polarized light incident on the liquid crystal layer 130 propagates along the long axis direction of the liquid crystal molecules, and no birefringence effect occurs. The liquid crystal layer 130 does not change the polarization direction of the incident light. Therefore, when the light with a polarization direction of 45° enters the liquid crystal box 10, after passing through the liquid crystal layer 130, the light still maintains a polarization direction of 45°. In this way, the polarization direction of the light emitted from the liquid crystal box 10 toward the optical layer 20 is 45°. Since the transmission axis of the optical layer 20 is 135°, the light with a polarization direction of 45° is reflected when it enters the optical layer 20 and is emitted toward the liquid crystal box 10. Moreover, after passing through the liquid crystal layer 130 in the liquid crystal box 10, the light still maintains a polarization direction of 45° and is emitted toward the second polarization structure 40. The light is emitted from the second polarization structure 40 toward the side away from the liquid crystal box 10, thereby entering the human eye. In this case, the ambient light incident on the display panel can be reflected for normal display of the display panel, the display panel is in a bright state (white state), and the light enters the human eye.

[0088] For example, a liquid crystal box displayed in the ADS mode is used as an example for explanation. When the transmission axis of the optical layer 20 is 0°, the transmission axis of the first polarizing structure 30 is 90°, and the transmission axis of the second polarizing structure 40 is 0°, natural light is incident from the side of the second polarizing structure 40 away from the liquid crystal box 10. After passing through the second polarizing structure 40, light with a polarization direction of 0° is obtained, and the light with a polarization direction of 0° enters the liquid crystal box 10. When no electric field is applied to the liquid crystal molecules in the liquid crystal layer 130, the liquid crystal molecules in the liquid crystal layer 130 are not deflected, and the polarization direction of the incident light will not be changed. After the light with a polarization direction of 0° enters the liquid crystal box 10, after passing through the liquid crystal layer 130, the light still maintains a polarization direction of 0°. In this way, the polarization direction of the light emitted from the liquid crystal box 10 toward the optical layer 20 is 0°. Since the transmission axis of the optical layer 20 is 0°, the light with a polarization direction of 0° is incident on the optical layer 20 and transmitted, and then directed toward the first polarizing structure 30, and is absorbed by the first polarizing structure 30 with a transmission axis of 90°. At this time, the ambient light incident on the display panel is not reflected, and the display panel does not display.

[0089] On this basis, an electric field is applied to the liquid crystal molecules in the liquid crystal layer 130, and the liquid crystal molecules are twisted. After passing through the second polarizing structure 40, the linear polarized light with a polarization direction of 0° is transformed into elliptically polarized light after passing through the liquid crystal layer 130 and emitted toward the optical layer 20. Since the transmission axis of the optical layer 20 is 0°, among the light emitted from the liquid crystal box 10 toward the optical layer 20, the light with a polarization direction of 0° is transmitted from the optical layer 20, and the rest of the light is reflected. Among them, the transmitted light is emitted toward the first polarizing structure 30. Since the transmission axis of the first polarizing structure 30 is 90°, the light with a polarization direction of 0° transmitted from the optical layer 20 is absorbed by the first polarizing structure 30. The reflected light is emitted toward the liquid crystal box 10 to provide the light required for the display panel to display. At this time, the display panel can display.

[0090] For example, the liquid crystal box displayed in the ADS mode is used as an example for description. Figure 5 When the transmission axis of the optical layer 20 is 90°, the transmission axis of the first polarizing structure 30 is 0°, and the transmission axis of the second polarizing structure 40 is 0°, natural light is incident from the side of the second polarizing structure 40 away from the liquid crystal box 10, and after passing through the second polarizing structure 40, light with a polarization direction of 0° is obtained, and the light with a polarization direction of 0° enters the liquid crystal box 10.

[0091] For example, reference Figure 5In the (A) part, the initial arrangement direction of the liquid crystal molecules is set according to the transmission axis direction of the second polarizing structure 40. When no electric field is applied to the liquid crystal molecules in the liquid crystal layer 130, the liquid crystal molecules in the liquid crystal layer 130 are not deflected, and the polarization direction of the incident light will not be changed at this time. After the light with a polarization direction of 0° enters the liquid crystal box 10, after passing through the liquid crystal layer 130, the light still maintains a polarization direction of 0°. In this way, the polarization direction of the light emitted from the liquid crystal box 10 toward the optical layer 20 is 0°. Since the transmission axis of the optical layer 20 is 90°, the light with a polarization direction of 0° is reflected when it enters the optical layer 20 and is emitted toward the liquid crystal box 10. Moreover, after passing through the liquid crystal layer 130 in the liquid crystal box 10, the light still maintains a polarization direction of 0° and is emitted toward the second polarizing structure 40. Since the light with a polarization direction of 0° is parallel to the transmission axis of the second polarizing structure 40, the light is emitted from the second polarizing structure 40 toward the side away from the liquid crystal box 10, thereby entering the human eye. In this case, the ambient light incident on the display panel can be reflected for normal display of the display panel, and the display panel is in a bright state (white state). Exemplarily, the display mode of the display panel is a normally white mode.

[0092] On this basis, reference Figure 5 In part (B), an electric field is applied to the liquid crystal molecules in the liquid crystal layer 130, and the liquid crystal molecules in the liquid crystal layer 130 are twisted, that is, the polarization direction of the light passing through the liquid crystal layer 130 will change. For example, after the light with a polarization direction of 0° enters the liquid crystal box 10, the polarization direction of the light changes after passing through the liquid crystal layer 130, so that the linear polarized light with a polarization direction of 0° becomes elliptically polarized light and is emitted toward the optical layer 20.

[0093] It should be noted that, in actual situations, most of the light incident on the liquid crystal layer will be twisted by the liquid crystal molecules, and a very small part of the light will not be completely twisted by the liquid crystal molecules. For example, after linear polarized light with a polarization direction of 0° passes through the liquid crystal layer 130, most of the light is elliptically polarized light, and a very small part of the light is still linearly polarized light with a polarization direction of 0°.

[0094] Since the transmission axis of the optical layer 20 is 90°, among the light emitted from the liquid crystal box 10 toward the optical layer 20, the light with a polarization direction of 90° is transmitted from the optical layer 20, and the rest of the light is reflected. Among them, the transmitted light is emitted to the first polarizing structure 30. Since the transmission axis of the first polarizing structure 30 is 0°, the light with a polarization direction of 90° transmitted from the optical layer 20 is absorbed by the first polarizing structure 30. The reflected light is emitted to the liquid crystal box 10. The polarization direction of this part of the light is approximately 0°. After passing through the liquid crystal layer 130, it becomes elliptically polarized light and is emitted toward the second polarizing structure 40. The second polarizing structure 40 transmits the light with a polarization direction parallel to its transmission axis and absorbs the rest of the light. In this case, the ambient light incident on the display panel is not reflected, and the display panel is in a dark state (black state).

[0095] It should be noted that, since the second polarizing structure transmits a small amount of light, slight light leakage may occur in the dark state of the display panel. However, the slight light leakage has little effect on the viewing experience of the user and can be ignored.

[0096] In this case, when the display panel is in the dark state, since the liquid crystal molecules in the liquid crystal layer of the liquid crystal box have different transmittances to light of different wavelengths, the linear polarized light is deflected into elliptically polarized light after passing through the liquid crystal layer. After irradiating the surface of the optical layer, the elliptically polarized light can be decomposed into linear polarized light with different polarization directions, wherein the light with a polarization direction parallel to the transmission axis of the optical layer is transmitted, irradiated on the surface of the first polarizing structure, and absorbed by the first polarizing structure, thereby reducing the brightness of the display panel in the dark state and improving the contrast of the display panel. Moreover, when the display panel is in the bright state, since the linear polarized light still maintains the original polarization direction after passing through the liquid crystal layer, irradiating on the surface of the optical layer, the light that is not parallel to the transmission axis of the optical layer is reflected. At this time, the linear polarized light is reflected on the surface of the optical layer, irradiated toward the liquid crystal box, and emitted from the liquid crystal box to provide the light required for display.

[0097] Therefore, an embodiment of the present disclosure provides a display panel, so that the ambient light obtains linearly polarized light after passing through the second polarization structure in the display panel, and the linearly polarized light is irradiated on the optical layer after passing through the liquid crystal box. The optical layer transmits the light whose polarization direction is parallel to the transmission axis of the optical layer among the light incident on the optical layer, and reflects the remaining light (i.e., the light whose polarization direction is not parallel to the transmission axis of the optical layer). The light transmitted from the optical layer irradiates the surface of the first polarizer and is absorbed by the first polarizer, and the display panel is in a dark state at this time. The light reflected from the optical layer is directed toward the liquid crystal box and emitted from the liquid crystal box, and the display panel is in a bright state at this time. In this way, the reflectivity of the light can be improved in the bright state, and the light is absorbed by the first polarizer in the dark state, which can avoid the reflection of the light. Compared with a display device provided with a reflective layer, the brightness of the display panel in the dark state is reduced, thereby improving the contrast of the display panel.

[0098] In some embodiments, Fig. 6A As shown, the optical layer 20 includes a plurality of first optical films 21 and a plurality of second optical films 22. In a direction perpendicular to the plane where the display panel 100 is located (for example, referring to Figure 2 Each first optical film 21 and each second optical film 22 are alternately stacked. For example, along a direction perpendicular to the plane where the display panel 100 is located (for example, reference Figure 2 or along the thickness direction of the optical layer 20 (the direction perpendicular to the plane where the optical layer 20 is located, i.e. Fig. 6A In the Z direction of the optical layer 20, a plurality of (e.g., dozens, hundreds, thousands, or tens of thousands) first optical films 21 and second optical films 22 are alternately stacked. Exemplarily, the thickness of the optical layer 20 is 150 μm to 300 μm, for example, the thickness of the optical layer 20 is 175 μm, 200 μm, or 250 μm.

[0099] The first optical films 21 have birefringence, and the second optical films 22 have single refraction, that is, the first optical films 21 are anisotropic, and the second optical films 22 are isotropic. For example, the first optical films 21 have two refractive indices, and the second optical films 22 have a single refractive index.

[0100] For example, Figure 6B As shown, along a first direction (eg Figure 6B The refractive index n1 of the first optical film 21 is X Greater than the refractive index n2 of the second optical film 22 X For example, along a first direction in the plane where the optical layer 20 is located, the refractive index of the first optical film 21 is about 1.8, and the refractive index of the second optical film 22 is about 1.57. Figure 6B The refractive index n2 of the first optical film 21 is X Equal to the refractive index n2 of the second optical film 22 Y For example, along the second direction in the plane where the optical layer 20 is located, the refractive index of the first optical film 21 and the refractive index of the second optical film 22 are both about 1.57. The first direction is perpendicular to the second direction.

[0101] It can be understood that the light will experience directional total reflection at the interface between the first optical film 21 and the second optical film 22, that is, at the interface between the first optical film 21 and the second optical film 22, the light whose polarization direction (vibration direction) is parallel to the first direction will be reflected, and the light whose polarization direction (vibration direction) is parallel to the second direction will be transmitted. In this way, after a beam of light passes through multiple interfaces, the light is decomposed into two beams of polarized light with mutually perpendicular polarization directions, one of which is parallel to the first direction, and the beam is reflected, and the other is parallel to the second direction, and the beam is transmitted. In this case, when the light whose polarization direction is parallel to the first direction (such as linear polarized light) is incident on the surface of the optical layer 20, most of the light will maintain its original polarization direction and be reflected; when the light whose polarization direction is parallel to the second direction (such as linear polarized light) is incident on the surface of the optical layer 20, most of the light will maintain its original polarization direction and be transmitted.

[0102] In addition, along a third direction perpendicular to the plane where the optical layer 20 is located (eg Figure 6B The refractive index of the first optical film 21 is equal to the refractive index of the second optical film 22. For example, along the third direction perpendicular to the plane where the optical layer 20 is located, the refractive index n1 of the first optical film 21 is equal to the refractive index of the second optical film 22. Z and the refractive index n2 of the second optical film 22 Z The angle is about 1.57. The plane where the optical layer 20 is located is the plane determined by the first direction and the second direction. The third direction is perpendicular to the first direction and the second direction respectively.

[0103] It should be noted that the first optical films 21 and the second optical films 22 are both relatively thin, so that the light reflected at the interface of the first optical films 21 and the second optical films 22 undergoes constructive interference or destructive interference, so that the optical layer 20 has corresponding reflection or transmission characteristics.

[0104] Among them, one of the first optical film 21 and the second optical film 22 is directly bonded (or bonded) to the first polarizing structure 30. Exemplarily, among the multiple superimposed first optical films 21 and second optical films 22, the outer surface of the outermost film layer is not covered by other film layers (such as coatings, which include, for example, optical diffusion layers, ultraviolet light absorption layers, anti-scratch coatings, and anti-tear layers, etc.), and there are no other film layers (such as protective layers, etc.) between the adjacent first optical films 21 and second optical films 22. In this way, it can be avoided that the light passes through other film layers and is scattered by particles (such as diffusion particles) on the surface of the film layer, resulting in a decrease in the transmittance and reflectivity of the light, thereby reducing the contrast of the display panel.

[0105] In some embodiments, Fig. 7A and Figure 7BAs shown, the display panel 100 further includes a scattering film 50. The scattering film 50 is disposed on a side of the liquid crystal box 10 close to the optical layer 20. That is, the scattering film 50 is located between the liquid crystal box 10 and the optical layer 20. Exemplarily, the scattering film 50 is fully bonded to a surface of the liquid crystal box 10 close to the optical layer 20, that is, the scattering film 50 is fully bonded to the outer surface of the first substrate 110 of the liquid crystal box 10, that is, the scattering film 50 is fully bonded to the outer surface of the array substrate of the liquid crystal box 10; in this way, there is no air between the scattering film 50 and the liquid crystal box 10, which can reduce the loss of light during propagation. Exemplarily, the optical layer 20 is fully bonded or frame-bonded to a surface of the scattering film 50 away from the liquid crystal box 10.

[0106] For example, reference Fig. 6A The optical layer 20 includes a plurality of first optical films 21 and a plurality of second optical films 22, and one of the first optical films 21 and the second optical films 22 is directly bonded (or adhered) to the scattering film 50. Therefore, the outer surface of the outermost film layer of the optical layer 20 has no other film layers, which can prevent light from being disturbed.

[0107] In other embodiments, Fig. 8A and Figure 8B As shown, the scattering film 50 is disposed on the side of the liquid crystal box 10 away from the optical layer 20. That is, the scattering film 50 is located between the liquid crystal box 10 and the second polarizer 40. Exemplarily, the scattering film 50 is fully bonded to the surface of the side of the liquid crystal box 10 away from the optical layer 20, that is, the scattering film 50 is fully bonded to the outer surface of the second substrate 110 of the liquid crystal box 10, that is, the scattering film 50 is fully bonded to the outer surface of the opposing substrate of the liquid crystal box 10; in this way, there is no air between the scattering film 50 and the liquid crystal box 10, which can reduce the loss of light during propagation. Exemplarily, the second polarizing structure 40 is fully bonded to the surface of the side of the scattering film 50 away from the liquid crystal box 10.

[0108] It is understandable that the scattering film 50 can adjust the propagation direction of the light passing through the scattering film 50, change the propagation angle of the light, improve the reflectivity of the display panel to light, improve the viewing angle of the display panel, and improve the contrast of the display panel. For example, when the display panel 100 performs black and white display, for example Fig. 7A and Figure 7B The light reflectivity of the display panel 100 can reach 41%, and the contrast ratio can reach 5:1.

[0109] Exemplarily, the scattering film 50 is anisotropic. Fig.9A and 9BAs shown, the scattering film 50 includes a plurality of scattering structures 51. It should be noted that the embodiment of the present disclosure does not limit the shape and tilt angle of the scattering structures 51 in the scattering film 50, and can be designed according to actual conditions. For example, the plurality of scattering structures 51 are columnar or plate-shaped. For example, the side of the scattering structure 51 is perpendicular to the direction of the plane where the scattering film 50 is located (for example, Fig.9A and Fig. 9B There is an angle between the scattering structure 51 and the Z direction in the horizontal direction, or the side surface of the scattering structure 51 is parallel to the direction perpendicular to the plane where the scattering film 50 is located. The scattering structure 51 has a top surface, a bottom surface and a side surface. Along the direction perpendicular to the plane where the scattering film is located, the top surface and the bottom surface of the scattering structure are arranged opposite to each other, and the side surface of the scattering structure is located between the top surface and the bottom surface.

[0110] For example, Fig. 9C As shown, the plurality of scattering structures 51 include a first scattering structure 511 and a second scattering structure 512. The first scattering structure 511 and the second scattering structure 512 are stacked in a direction perpendicular to the plane where the scattering film 50 is located. For example, in a direction perpendicular to the plane where the scattering film 50 is located, the bottom surface of the second scattering structure 512 and the top surface of the first scattering structure 511 are arranged close to each other. For example, the bottom surface of the second scattering structure 512 is in contact with the top surface of the first scattering structure 511. For example, the second scattering structure 512 and the first scattering structure 511 are arranged in a staggered manner. For example, the side surface of the first scattering structure 511 may be parallel to the direction perpendicular to the plane where the scattering film 50 is located, and the side surface of the second scattering structure 512 may have an angle with the direction perpendicular to the plane where the scattering film 50 is located; or, for example, the side surfaces of the first scattering structure 511 and the second scattering structure 512 both have an angle with the direction perpendicular to the plane where the scattering film 50 is located.

[0111] The scattering film 50 has a diffusion axis. Exemplarily, the angle between the diffusion axis and the direction perpendicular to the plane where the display panel 100 is located is 0° to 75°; for example, the angle between the diffusion axis and the direction perpendicular to the plane where the display panel 100 is located is 0° to 45°; for example, the angle between the diffusion axis and the direction perpendicular to the plane where the display panel 100 is located is 30°, 45°, 55° or 60°, etc. The scattering film 50 is configured so that when the light is incident on the scattering film 50 in a direction parallel to the diffusion axis, the intensity of the light emitted from the scattering film 50 is the maximum. Exemplarily, refer to 9A to 9C , the diffusion axis K of the scattering film 50 may be 0° to 90°. For example, the diffusion axis of the scattering film 50 may be 0° to 10° or 0° to 45°, for example, the diffusion axis may be 5°, 10°, and 15°. The diffusion axis K of the scattering film 50 is the angle between the light with the highest light intensity among the light passing through the scattering film 50 and the direction perpendicular to the plane where the scattering film 50 is located. For example, the diffusion axis K of the scattering film 50 is the angle between the light passing through the scattering film 50 and the direction perpendicular to the plane where the display panel 100 is located (refer to 9A to 9C The angle between the light beam and the diffusion axis is the Z direction in the image. Among the light beams emitted through the scattering film 50, the intensity of the light beam in the direction of the diffusion axis is the largest. For example, when the diffusion axis of the scattering film 50 is 0°, among the light beams emitted through the scattering film 50, the intensity of the light beam in the direction of the diffusion axis is 0° is the largest, that is, the intensity of the light beam in the direction of the angle of 0° with the direction perpendicular to the plane where the scattering film 50 is located is the largest; for example, when the diffusion axis of the scattering film 50 is 10°, among the light beams emitted through the scattering film 50, the intensity of the light beam in the direction of the diffusion axis is 10° is the largest, that is, the intensity of the light beam in the direction of the angle of 10° with the direction perpendicular to the plane where the scattering film 50 is located is the largest.

[0112] Exemplarily, in the display device 200 , the reflectivity of light is maximum in the direction of the diffusion axis of the diffusion film 50 , and the intensity of reflected light in the direction of the diffusion axis of the diffusion film 50 is maximum.

[0113] It should be noted that the bonding method of the scattering film in the display device can be adjusted according to actual conditions (such as different usage scenarios of the display device or the user's line of sight, etc.), and is not limited here. Fig.9D In part (A), when the display device 200 is used for outdoor display (for example, the display device 200 is placed 2 meters away from the ground), the user's line of sight is approximately perpendicular to the normal F direction of the display surface of the display device 200 (for example, the angle α is greater than or equal to 75°). At this time, the diffusion axis of the scattering film can be attached perpendicular to the normal direction of the display surface of the display device; for example, referring to Fig.9D In part (B), when the user's sight line direction is approximately parallel to the normal direction of the display surface of the display device 200 (such as a tablet computer, etc.) (for example, the angle α is less than or equal to 15°), the diffusion axis of the scattering film can be attached parallel to the normal direction of the display surface of the display device. In this way, the reflectivity of light can be greater in the user's sight line direction, thereby improving the display effect.

[0114] For example, Fig.11As shown, the liquid crystal box 10 also includes an electrostatic shielding pattern 190, which is disposed on the second substrate 120 and close to one side of the liquid crystal layer 130. By way of example, in the case where a filter layer is disposed on the second substrate in the liquid crystal layer, the electrostatic shielding pattern is closer to the liquid crystal layer than the filter layer. The material of the electrostatic shielding pattern 190 is a transparent conductive material, such as ITO. In this way, it is possible to avoid the reduction of the display effect due to static charges in the liquid crystal box. By way of example, since the refractive index of the conductive structure in the liquid crystal box (such as the transparent conductive structure such as the first electrode, the second electrode and the electrostatic shielding pattern) is relatively high, for example, the refractive index of ITO is 1.8 to 2.1, the light will be reflected (such as mirror reflection) on the surface of the conductive structure.

[0115] For example, refer to Fig. 7A In the case where the scattering film 50 is located on the side of the liquid crystal cell 10 close to the optical layer 20, the reflected light from the conductive structure in the liquid crystal cell 10 will not pass through the scattering film 50. In this case, the light will be reflected on the conductive structure in the liquid crystal cell 10. Fig.10 As shown in part (A), when the incident angle of the test light on the surface of the conductive structure is not 0°, most of the light will be reflected at the same angle as the incident angle. At this time, the detector located in the normal direction of the plane where the conductive structure is located (that is, the detector detects the reflected light with an angle of 0° with the normal direction of the plane where the conductive structure is located) cannot detect the reflected light on the surface of the conductive structure.

[0116] For example, refer to Fig. 8A When the scattering film 50 is located on the side of the liquid crystal cell 10 away from the optical layer 20, the reflected light from the conductive structure in the liquid crystal cell 10 will pass through the scattering film 50, that is, the scattering film 50 diffuses the reflected light, and the reflected light will propagate in multiple reverse directions, forming a reflected light distribution similar to diffuse reflection. Fig.10 As shown in part (B) of FIG. 1 , when the incident angle of the test light on the surface of the conductive structure is not 0°, the detector located in the normal direction of the plane where the conductive structure is located (i.e., the detector detects the reflected light with an angle of 0° with the normal direction of the plane where the conductive structure is located) can detect the reflected light on the surface of the conductive structure. In this way, the viewing angle of the outgoing light of the display panel is expanded.

[0117] In this case, the detector is displayed on the display panel (such as Fig. 8A and Figure 8B The display panel 100 in the embodiment may detect reflected light from the surface of the conductive structure in either a dark state or a bright state, so that the reflectivity of the display panel to light is improved in either a dark state or a bright state.

[0118] In this way, according to the contrast CR=R1 / R2, R1 is the reflectivity of the display panel to light in the bright state, and R2 is the reflectivity of the display panel to light in the dark state. For example, when the display grayscale range is 0 to 255, the reflectivity of the display panel to light in the bright state is the reflectivity of the display panel to light when the grayscale is 255, and the reflectivity of the display panel to light in the dark state is the reflectivity of the display panel to light when the grayscale is 0. Fig. 8A and Figure 8B The reflectivity of the display panel 100 to light is compared with Fig. 7A and Figure 7B The display panel 100 has a high reflectivity to light. Fig. 7A and Figure 7B The display panel 100 and Fig. 8A and Figure 8B The difference in reflectivity of the display panel 100 to light in the bright state is small, and Fig. 8A and Figure 8B The reflectivity of the display panel 100 in the dark state to light is greater than Fig. 7A and Figure 7B The reflectivity of the display panel 100 in the dark state to light, that is, in the dark state Fig. 7A and Figure 7B The display screen of the display panel 100 is compared with Fig. 8A and Figure 8B The display screen of the display panel 100 is darker, therefore, Fig. 7A and Figure 7B The contrast ratio of the display panel 100 is compared with Fig. 8A and Figure 8B The contrast of the display panel 100 is higher. Fig. 8A and Figure 8B For the display panel 100 in the dark state, when the reflectivity of the display panel 100 to light is high, the contrast of the display panel 100 will be low. Fig. 7A and Figure 7B In the display panel 100, when the reflectivity of the display panel 100 to light in the dark state is low, the contrast of the display panel 100 will be higher.

[0119] In some embodiments, Figures 7A to 7B and FIG. 8A to FIG. 8B As shown, the display panel 100 further includes an anti-reflection film 60. The anti-reflection film is disposed on a side of the second polarizing structure 40 away from the optical layer 20. Exemplarily, the anti-reflection film 60 is fully attached to a surface of the second polarizing structure 40 away from the optical layer 20 (ie, away from the liquid crystal cell 10).

[0120] It can be understood that the anti-reflection film 60 has an anti-reflection effect on the light incident on the display panel, so that more light can pass through the anti-reflection film 60, reducing light loss and improving the transmittance of light.

[0121] It should be noted that the anti-reflection film can be designed according to actual conditions, and is not limited here. For example, the anti-reflection film 60 can be a single-layer, double-layer, triple-layer or multi-layer structure.

[0122] In some embodiments, Fig.12 As shown, the liquid crystal box 10 further includes a first alignment layer 160 and a second alignment layer 170. The first alignment layer 160 is disposed on the first substrate 110 and close to the liquid crystal layer 130, and the second alignment layer 170 is disposed on the second substrate 120 and close to the liquid crystal layer 130. The first alignment layer 160 has a first alignment direction, and the second alignment layer 170 has a second alignment direction.

[0123] Illustratively, the first alignment direction and the second alignment direction may be, for example, rubbing directions in a process of forming the alignment layer using a rubbing process.

[0124] It should be noted that the first alignment direction and the second alignment direction can be designed according to actual needs.

[0125] Exemplarily, the first alignment direction is parallel to the second alignment direction, and the second alignment direction is perpendicular to the transmission axis of the second polarizing structure 40. For example, the transmission axis of the second polarizing structure 40 is 90°, and the first alignment direction and the second alignment direction are both 0°. Or, for example, the first alignment direction and the second alignment direction are both 90°, and the transmission axis of the second polarizing structure 40 is 0°. For example, the liquid crystal cell 10 can be applied to an ADS type display panel.

[0126] Alternatively, illustratively, the first orientation direction is perpendicular to the second orientation direction, and the second orientation direction is parallel to the transmission axis of the second polarizing structure. For example, the first orientation direction is 135°, the second orientation direction is 45°, and the transmission axis of the second polarizing structure 40 is 45°. At this time, the second electrode is disposed on the second substrate, and both the first electrode and the second electrode are planar electrodes. For example, the liquid crystal box 10 can be applied to a TN type display panel.

[0127] It should be noted that any direction within the plane where the display panel is located can be used as a reference direction for the alignment direction. For example, the extension direction of the grid lines can be used as the 0° alignment direction.

[0128] In some embodiments, reference Figure 3C and Figure 3DThe liquid crystal box 10 further includes a plurality of filter layers 180. The plurality of filter layers 180 are disposed on the second substrate 120 and close to a side of the liquid crystal layer 130. Exemplarily, the thickness of the plurality of filter layers 180 is 0.3 μm to 3 μm, for example, the thickness of the plurality of filter layers 180 is 1 μm to 2.35 μm. For example, the thickness of the plurality of filter layers 180 may be 1 μm, 1.8 μm, 2.1 μm, 2.3 μm or 2.35 μm.

[0129] The plurality of filter layers 180 include a first filter layer, a second filter layer and a third filter layer. The color of light passing through the first filter layer is the first color, the color of light passing through the second filter layer is the second color, and the color of light passing through the third filter layer is the third color; the first color, the second color and the third color are three primary colors, for example, the first color, the second color and the third color are red, green and blue respectively.

[0130] For example, reference Figure 3C and Figure 3D The liquid crystal cell 10 further includes a black matrix (BM) disposed on the second substrate 120 .

[0131] For example, the thickness of the filter layer 180 is relatively large, which has a certain influence on the reflectivity of the light. FIG. 8A to FIG. 8B The reflectivity of the display panel 100 in FIG. 1 (eg, about 38.1%) to light is greater than that of the display panel for color display (eg, FIG. 7A to FIG. 7B The reflectivity of the display panel 100 in the display panel 100 to light (for example, about 4.5%); the contrast ratio of the display panel for black and white display (for example, about 9.5:1) is greater than the contrast ratio of the display panel for color display (for example, about 7.2:1); the color gamut of the display panel for color display is about 35%.

[0132] Table 1

[0133]

[0134] Table 1 provides the display panels of different sizes (such as Fig. 7A and Figure 7B In the display panel 100), the thickness of the filter layer affects the color gamut, reflectivity and contrast of the display panel. Fig.13 (A) to (C) provide the relationship between the thickness of the filter layer and the color gamut, reflectivity and resolution of a 19-inch display panel respectively; Fig.13 (D) to (F) in the figure provide the relationship between the thickness of the filter layer and the color gamut, reflectivity and resolution of a 43-inch display panel respectively; Fig.13(G) to (I) in FIG. 4 provide the relationship between the thickness of the filter layer and the color gamut, reflectivity, and resolution of a 46-inch display panel. It can be seen that as the thickness of the filter layer increases, the reflectivity of the display panel decreases, the contrast decreases, and the color gamut increases first and then decreases.

[0135] It should be noted that the liquid crystal box 10 in the text can be a liquid crystal box in a transmissive display device. In this way, there is no need to redesign the liquid crystal box structure used for reflective display, which can save production costs. For example, a liquid crystal box in a normally black mode in a transmissive ADS type display device is used in a reflective display device, and the display mode of the liquid crystal box is a normally white mode. For example, in a transmissive display device, the liquid crystal molecules in the liquid crystal box are displayed as a dark state in a non-working state (i.e., a state not affected by an electric field), and the liquid crystal molecules are displayed as a bright state in a working state (i.e., a state affected by an electric field). The liquid crystal box is applied to a reflective display device, and the liquid crystal molecules in the liquid crystal box are displayed as a bright state in a non-working state (i.e., a state not affected by an electric field), and the liquid crystal molecules are displayed as a dark state in a working state (i.e., a state affected by an electric field). This allows the liquid crystal box to be converted from a normally black mode to a normally white mode.

[0136] In some embodiments, Figure 1 As shown, the display device 200 further includes a data processor 210. The data processor 210 is coupled to the display panel 100. The data processor 210 is configured to invert the input first image data to obtain second image data. The display panel 100 is configured to display an image according to the second image data. For example, the display panel 100 can display an image corresponding to the first image data according to the second image data.

[0137] Exemplarily, the first image data and the second image data may be digital signals. For example, the display device uses an 8-bit grayscale, that is, the grayscale is 0 to 255, that is, the grayscale is 00000000 to 11111111. For example, when the first image data is 00000000 (gray scale 0), the data processor 210 inverts the first image data to obtain second image data, and the second image data is 11111111 (gray scale 255); when the first image data is 00000001 (gray scale 1), the data processor 210 inverts the first image data to obtain second image data, and the second image data is 11111110 (gray scale 254); when the first image data is 00000010 (gray scale 2), the data processor 210 inverts the first image data to obtain second image data, and the second image data is 11111101 (gray scale 253); when the first image data is 11111111 (gray scale 255), the data processor 210 inverts the first image data to obtain second image data, and the second image data is 00000000 (gray scale 0). Exemplarily, referring to Fig.14 The data processor inverts the grayscale 0 in the first image data to obtain the grayscale 255 in the second image data, and inverts the grayscale 255 in the first image data to obtain the grayscale 0 in the second image data. In this way, the image displayed by the display device according to the second image data is consistent with the image corresponding to the first image data.

[0138] In this case, if the image input to the display device is a black screen, the image actually displayed by the display device is a white screen. If the image input to the display device is a white screen, the image actually displayed by the display device is a black screen. For example, the 0 grayscale data corresponding to the black screen input to the data processor of the display device is 00000000, that is, the first image data is 00000000, then the data output by the data processor is 11111111, that is, the second image data is 11111111. At this time, an electric field is formed between the first electrode and the second electrode in the liquid crystal box, and the liquid crystal molecules are in a working state. At this time, the reference Figure 5 , the display panel 100 is in a dark state, so that the display panel 100 displays a black screen corresponding to grayscale 0. For example, the data processor of the display device inputs 255 grayscale data 1111111 corresponding to the white screen, that is, the first image data is 11111111, and the data processor outputs data 00000000, that is, the second image data is 00000000. At this time, no electric field is formed between the first electrode and the second electrode in the liquid crystal box, and the liquid crystal molecules are in a non-working state. At this time, reference Figure 5 , the display panel 100 is in a bright state, so that the display panel 100 displays a white screen corresponding to grayscale 255. In this case, the grayscales of the input image and the output image (ie, the display image) of the display device are consistent, avoiding abnormal display data.

[0139] For example, when the display device 200 performs black and white display, the viewing angle of the display device 200 can be increased to about 70°. Moreover, under different viewing angles, the display device can display normally without color deviation, which can meet the user's demand for wide-angle display.

[0140] Exemplarily, the data processor may be arranged in a timing controller (TCON) or may be coupled to the timing controller. For example, the source driver in the display device may provide a driving signal to the display panel according to the second image data to drive the display panel to display an image. Exemplarily, the data processor may be implemented in the form of hardware or in the form of a software functional unit. For example, when implemented by software, the data processor may be implemented by a software functional module generated by at least one processor after reading a program code stored in a memory. For example, when implemented by hardware, the data processor may be implemented by a logic circuit including a NOT gate or a conversion circuit (Swap). For example, the data processor may implement an input of 0 and an output of 1.

[0141] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be thought of by any person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A display panel, characterized in that: include: A liquid crystal box; the liquid crystal box comprises a first substrate, a second substrate and a liquid crystal layer; the first substrate and the second substrate are arranged opposite to each other, and the liquid crystal layer is sandwiched between the first substrate and the second substrate; an optical layer, disposed on a side of the first substrate of the liquid crystal cell away from the second substrate; the optical layer is configured to transmit light whose polarization direction is parallel to the transmission axis of the optical layer among the light incident on the optical layer, and reflect the rest of the light; A scattering film is disposed on a side of the liquid crystal box close to the optical layer and between the liquid crystal box and the optical layer; A first polarizing structure is disposed on a side of the optical layer away from the liquid crystal box; the first polarizing structure is configured to transmit light whose polarization direction is parallel to the transmission axis of the first polarizing structure among the light incident on the first polarizing structure, and absorb the rest of the light; and a second polarizing structure, disposed on a side of the liquid crystal box away from the optical layer; the second polarizing structure is configured to transmit light whose polarization direction is parallel to the transmission axis of the second polarizing structure among the light incident on the second polarizing structure, and absorb the rest of the light; The transmission axis of the first polarizing structure is perpendicular to the transmission axis of the optical layer, and the transmission axis of the second polarizing structure is perpendicular or parallel to the transmission axis of the optical layer; The optical layer comprises: a plurality of first optical films, wherein the plurality of first optical films are birefringent; and A plurality of second optical films, wherein the plurality of second optical films are single refractive; Each first optical film and each second optical film are alternately stacked along a direction perpendicular to the plane where the display panel is located; One of the first optical film and the second optical film is directly bonded to the scattering film; Along a first direction within the plane where the optical layer is located, the refractive index of the first optical film is greater than the refractive index of the second optical film; Along a second direction within the plane where the optical layer is located, the refractive index of the first optical film is equal to the refractive index of the second optical film; Along a third direction perpendicular to the plane where the optical layer is located, the refractive index of the first optical film is equal to the refractive index of the second optical film; the first direction is perpendicular to the second direction, and the third direction is perpendicular to the first direction and the second direction respectively.

2. The display panel according to claim 1, characterized in that: The transmission axis of the second polarizing structure is parallel to the transmission axis of the first polarizing structure.

3. The display panel according to claim 1, characterized in that: The transmission axis of the optical layer is 0° to 180°; The transmission axis of the optical layer is parallel to the plane where the display panel is located.

4. The display panel according to claim 1, characterized in that: The diffusion axis of the scattering film is 0° to 90°.

5. The display panel according to claim 1, characterized in that: Also includes: The anti-reflection film is arranged on a side of the second polarizing structure away from the optical layer.

6. The display panel according to any one of claims 1 to 5, characterized in that: The liquid crystal box also includes: A first alignment layer is disposed on the first substrate and close to a side of the liquid crystal layer; the first alignment layer has a first alignment direction; and A second alignment layer is disposed on the second substrate and close to a side of the liquid crystal layer; the second alignment layer has a second alignment direction; The first alignment direction is parallel or perpendicular to the second alignment direction.

7. The display panel according to claim 6, characterized in that: The first alignment direction is parallel to the second alignment direction, and the second alignment direction is perpendicular to the transmission axis of the second polarizing structure.

8. The display panel according to claim 7, characterized in that: The liquid crystal box further comprises: a first electrode and a second electrode; the first electrode is disposed on the first substrate; The second electrode is disposed on the first substrate; the first electrode is farther away from the liquid crystal layer than the second electrode; the second electrode is a slit electrode, and the first electrode is a planar electrode.

9. The display panel according to claim 6, characterized in that: The first alignment direction is perpendicular to the second alignment direction, and the second alignment direction is parallel to the transmission axis of the second polarizing structure; The liquid crystal box further comprises: a first electrode and a second electrode; the first electrode is disposed on the first substrate; The second electrode is disposed on the second substrate, and both the first electrode and the second electrode are planar electrodes.

10. The display panel according to any one of claims 1 to 5, characterized in that: The liquid crystal box also includes: A plurality of filter layers are disposed on the second substrate and close to a side of the liquid crystal layer; The thickness of the plurality of filter layers is 0.3 μm to 3 μm.

11. The display panel according to any one of claims 1 to 5, characterized in that: The liquid crystal box further includes: an electrostatic shielding pattern, which is disposed on the second substrate and close to a side of the liquid crystal layer.

12. A display device, characterized in that: include: The display panel according to any one of claims 1 to 11.

13. The display device according to claim 12, characterized in that: Also includes: A data processor coupled to the display panel; the data processor is configured to invert the input first image data to obtain second image data; The display panel is configured to display an image according to the second image data.

Images