Display panel and display device

Abstract

The present application discloses a display panel and a display device, which relate to the field of display technology and can improve the light extraction efficiency of the display panel, thereby reducing power consumption and increasing lifespan. The display panel comprises: a substrate layer; a plurality of pixel units, arranged on one side of the substrate layer; at least one optical adjustment layer, arranged on the side of the pixel unit away from the substrate layer; the optical adjustment layer is used to transmit a first circularly polarized light and block a second circularly polarized light, wherein the first circularly polarized light and the second circularly polarized light have different rotation directions, so that the second circularly polarized light is converted into the first circularly polarized light after reflection and then passes through the optical adjustment layer.

Description

Technical Field

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

[0002] At present, with the rapid development of display technology, more and more functions are integrated into display panels, and full-screen appearance with a high screen-to-body ratio is becoming more and more common. In order to meet the needs of display driving, appearance optimization or other functions, more and more electrodes and traces are integrated into the display panel, and the materials used for some electrodes and traces have a reflective effect. The structure with a reflective effect will cause a large amount of reflection of the external ambient light of the display panel, which will cause the reflected light of the display panel to interfere with the display light, and the contrast and visibility of the display panel will be reduced.

[0003] However, reducing the reflection of the display panel usually results in low light output efficiency of the display panel, that is, while reducing the ambient light reflection efficiency of the display panel, it also reduces the light output efficiency of the output light used by the display panel to display the picture, which in turn affects the power consumption and life of the display panel. Summary of the invention

[0004] The embodiments of the present application provide a display panel and a display device, which can improve the light extraction efficiency of the display panel, thereby reducing the power consumption of the display panel and increasing the lifespan.

[0005] According to a first aspect of an embodiment of the present application, a display panel is provided, comprising:

[0006] substrate layer;

[0007] A plurality of pixel units are arranged on one side of the substrate layer;

[0008] At least one optical adjustment layer is disposed on a side of the pixel unit away from the substrate layer;

[0009] The optical adjustment layer is used to transmit a first circularly polarized light and block a second circularly polarized light, wherein the first circularly polarized light and the second circularly polarized light have different rotation directions, so that the second circularly polarized light is converted into the first circularly polarized light after reflection and then transmits through the optical adjustment layer.

[0010] In some embodiments, the optical adjustment layer includes a cholesteric liquid crystal layer.

[0011] In some embodiments, the optical conditioning layer includes a plurality of conditioning regions;

[0012] The pixel unit includes a plurality of sub-pixels, different sub-pixels are used to emit or transmit light of different colors, and the orthographic projection of the adjustment area on the substrate layer covers the orthographic projection of the sub-pixel on the substrate layer;

[0013] The central wavelength ranges of the adjustment areas corresponding to different sub-pixels are different, and the central wavelength range corresponding to the adjustment area is the wavelength range corresponding to the first circularly polarized light.

[0014] In some embodiments, when the optical adjustment layer includes the cholesteric liquid crystal layer, the pitch of the spirally arranged liquid crystal molecules of the cholesteric liquid crystal layer is determined according to the central wavelength range corresponding to the adjustment region.

[0015] In some implementations, the adjustment regions corresponding to all the different sub-pixels are disposed in the same layer of the optical adjustment layer.

[0016] In some embodiments, the optical adjustment layer to which the adjustment regions corresponding to at least two different sub-pixels belong is disposed in the same layer.

[0017] In some embodiments, the number of layers of the optical adjustment layer is the same as the number of types of the sub-pixels in each of the pixel units, each layer of the optical adjustment layer corresponds to a target sub-pixel, and each layer of the optical adjustment layer includes a plurality of adjustment areas and a normal transmission area, the adjustment area is used to transmit the first circularly polarized light corresponding to the target sub-pixel and block the second circularly polarized light, and the normal transmission area is used to transmit light from other sub-pixels other than the target sub-pixel.

[0018] In some embodiments, the normally transparent area includes a color filter film.

[0019] In some embodiments, the pixel unit includes multiple sub-pixels, different sub-pixels are used to emit or transmit light of different colors, the number of layers of the optical adjustment layer is the same as the number of types of the sub-pixels in each of the pixel units, different layers of the optical adjustment layer correspond to different sub-pixels, and different layers of the optical adjustment layer correspond to different central wavelength ranges.

[0020] In some embodiments, the pixel unit includes a red sub-pixel, a green sub-pixel, and a blue sub-pixel;

[0021] The central wavelength range corresponding to the red sub-pixel is 600nm to 650nm, and the half-peak width of the spectrum of the optical adjustment layer corresponding to the red sub-pixel is 5nm to 100nm; and / or,

[0022] The central wavelength range corresponding to the green sub-pixel is 520nm to 550nm, and the half-peak width of the spectrum of the optical adjustment layer corresponding to the green sub-pixel is 5nm to 100nm; and / or,

[0023] The central wavelength range corresponding to the blue sub-pixel is 450nm to 480nm, and the half-peak width of the spectrum of the optical adjustment layer corresponding to the blue sub-pixel is 5nm to 100nm.

[0024] In some embodiments, the display panel further includes:

[0025] A circular polarizer, disposed on a side of the optical adjustment layer away from the substrate layer;

[0026] The circular polarizer includes a linear polarizer and a phase retardation film, and the phase retardation film is arranged between the optical adjustment layer and the linear polarizer.

[0027] In some embodiments, the phase retardation film includes a first phase retardation film and a second phase retardation film;

[0028] The angle between the slow axis of the first phase delay film and the absorption axis of the linear polarizer is a first angle, the angle between the slow axis of the second phase delay film and the absorption axis of the linear polarizer is a second angle, and the second angle is linearly related to the first angle.

[0029] In some embodiments, the first phase retardation film is a half wave plate, and the second phase retardation film is a quarter wave plate; and / or,

[0030] The first phase retardation film and / or the second phase retardation film includes a cholesteric liquid crystal layer.

[0031] In some embodiments, the display panel further includes:

[0032] An encapsulation layer, disposed between the pixel unit and the optical adjustment layer;

[0033] A touch layer, wherein the touch layer is disposed between the encapsulation layer and the optical adjustment layer, or the touch layer is disposed on a side of the optical adjustment layer away from the substrate layer.

[0034] According to a second aspect of an embodiment of the present application, a display device is provided, including:

[0035] A display panel as described in the first aspect.

[0036] The display panel and display device provided by the embodiment of the present application are provided with an optical adjustment layer, the optical adjustment layer is used to transmit the first circular polarization and block the second circular polarization, the first circular polarization and the second circular polarization have different rotation directions, so that the second circular polarization is converted into the first circular polarization after reflection and then transmits from the optical adjustment layer. Then the light emitted or transmitted by the pixel unit is not lost, and all are emitted from the optical adjustment layer, which can greatly improve the light output of the display panel, and then improve the light output efficiency of the display screen of the display panel. The improvement of the light output efficiency of the display panel can reduce the driving power consumption of the display panel, that is, in the display effect of the same light output, the driving power consumption of the display panel provided by the embodiment of the present application is lower, which can further improve the service life of the display panel. In addition, the ambient light outside the display panel is incident on the optical adjustment layer from the display side of the display panel, the first circular polarization is transmitted and incident on the inside of the display panel, and the second circular polarization is reflected and blocked outside the display panel, which can reduce the external ambient light from entering the display panel. The first circularly polarized light that passes through is reflected by the reflective structure inside the display panel and changes its direction of rotation to obtain the second circularly polarized light. The second circularly polarized light enters the optical adjustment layer again and cannot pass through. It can be blocked inside the display panel and cannot be emitted, which can reduce the amount of light reflected by the display panel for ambient light and has the effect of reducing the reflectivity of ambient light. The reflectivity of ambient light can be maintained at a low level and will not affect the normal display of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic structural diagram of a display panel provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of a light path of a display panel provided in an embodiment of the present application;

[0039] Figure 3 Another optical path schematic diagram of a display panel provided in an embodiment of the present application;

[0040] Figure 4 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0041] Figure 5 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0042] Figure 6 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0043] Figure 7 A schematic structural diagram of a display panel provided in an embodiment of the present application;

[0044] Figure 8 A schematic structural diagram of another display panel provided in an embodiment of the present application;

[0045] Fig. 9 A schematic diagram of another optical path of a display panel provided in an embodiment of the present application;

[0046] Fig.10 A schematic structural diagram of a circular polarizer provided in an embodiment of the present application;

[0047] Fig.11 A reflection spectrum of an optical adjustment layer of a display panel provided in an embodiment of the present application;

[0048] Fig.12 A white light spectrum of a display panel provided in an embodiment of the present application;

[0049] Fig.13 A red light spectrum of a display panel provided in an embodiment of the present application;

[0050] Fig.14 A green light spectrum of a display panel provided in an embodiment of the present application;

[0051] Fig.15 A blue light spectrum of a display panel provided in an embodiment of the present application;

[0052] Fig.16 A reflectivity curve of a display panel provided in an embodiment of the present application;

[0053] Fig.17 A schematic structural diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.

[0055] In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.

[0056] At present, with the rapid development of display technology, more and more functions are integrated on the display panel, and the full-screen appearance with a high screen-to-body ratio is becoming more and more common. In order to meet the needs of display driving, appearance optimization or other functions, the display panel integrates more and more electrodes and wiring, and the materials used in some electrodes and wiring have a reflective effect. The structure with a reflective effect will cause a large amount of reflection of the external ambient light of the display panel, which will cause the reflected light of the display panel to interfere with the display light, and the contrast and visibility of the display panel will be reduced. However, the reduction of the reflection of the display panel usually results in a low light output efficiency of the display panel, that is, while reducing the ambient light reflection efficiency of the display panel, it will also reduce the light output efficiency of the output light used by the display panel to display the picture, which will in turn affect the power consumption and life of the display panel.

[0057] In view of this, the embodiments of the present application provide a display panel and a display device, which can improve the light extraction efficiency of the display panel, thereby reducing the power consumption of the display panel and increasing the lifespan.

[0058] According to a first aspect of an embodiment of the present application, a display panel is provided. Figure 1 This is a schematic structural diagram of a display panel provided in an embodiment of the present application. Figure 1 As shown, the display panel provided in the embodiment of the present application includes: a substrate layer 100, a plurality of pixel units 200 and at least one optical adjustment layer 300. The substrate layer 100 may be hard, and the hardness may be a glass substrate. The substrate layer 100 may also be flexible, and a polyimide film layer may be used, which is not specifically limited in the embodiment of the present application. The plurality of pixel units 200 may be arranged in an array, and the pixel unit 200 is disposed on one side of the substrate layer 100; the pixel unit 200 may include an actively luminous light-emitting device, and the pixel unit 200 may also include a passively luminous display device that transmits light under a driving signal, such as a liquid crystal driving device, which is not specifically limited in the embodiment of the present application.

[0059] Figure 2 A schematic diagram of a light path of a display panel provided in an embodiment of the present application; Figure 3 Another optical path schematic diagram of a display panel provided in an embodiment of the present application. Figure 1-Figure 3 , the optical adjustment layer 300 is arranged on the side of the pixel unit 200 away from the substrate layer 100; the optical adjustment layer 300 is used to transmit the first circularly polarized light L1 and block the second circularly polarized light L2, wherein the first circularly polarized light L1 and the second circularly polarized light L2 have different rotation directions, so that the second circularly polarized light L2 is converted into the first circularly polarized light L1 after reflection and then passes through the optical adjustment layer 300. It should be noted that the wavelengths of the first circularly polarized light L1 and the second circularly polarized light L2 are the same. It should be noted that the number of layers of the optical adjustment layer 300 can be one or more layers, Figure 1 It is only for illustration and is not intended to be a specific limitation of this application.

[0060] For example, Figure 2 As shown, the light emitted or transmitted by the pixel unit 200 of the display panel is natural light L0, and the natural light L0 has light of various vibration directions. After the natural light L0 passes through the optical adjustment layer 300, the first circularly polarized light L1 is transmitted from the optical adjustment layer 300, and the transmitted first circularly polarized light L1 can be used for picture display, and the second circularly polarized light L2 is reflected back to the inside of the display panel by the optical adjustment layer 300. Exemplarily, the first circularly polarized light L1 is left-handed circularly polarized light, and the second circularly polarized light L2 is right-handed circularly polarized light, and the first circularly polarized light L1 and the second circularly polarized light L2 have opposite rotation directions. After the second circularly polarized light L2 is reflected inside the display panel, the rotation direction can be changed to obtain the first circularly polarized light L1, and the first circularly polarized light L1 obtained by reflection can continue to be transmitted from the optical adjustment layer 300, so that the light emitted or transmitted by the pixel unit 200 is not lost, and is emitted from the optical adjustment layer 300, which can greatly increase the light output of the display panel, thereby improving the light output efficiency of the display picture of the display panel.

[0061] For example, Figure 3As shown, the ambient light outside the display panel is natural light, which is represented by L00 for distinction. L00 enters the optical adjustment layer 300 from the display side of the display panel, and the first circularly polarized light L1 is transmitted and then enters the interior of the display panel. The transmitted first circularly polarized light L1 undergoes a rotational change after being reflected by the internal reflection structure of the display panel, and obtains the second circularly polarized light L2. The second circularly polarized light L2 enters the optical adjustment layer 300 again and cannot pass through, and can be blocked inside the display panel and cannot be emitted, which can reduce the amount of reflected light from the display panel for the ambient light, and can play the effect of reducing the reflectivity of the ambient light. Even if the second circularly polarized light L2 is repeatedly reflected to obtain the first circularly polarized light L1 again and is emitted from the optical adjustment layer 300, the light has lost a large part of its energy in the process of repeated reflection, and the reflectivity of the ambient light can still be maintained at a low level, which will not affect the normal display of the display panel.

[0062] It should be noted that Figure 2 and Figure 3 The dashed arrows shown indicate the propagation direction of the light. The optical adjustment layer 300 can also transmit right-handed circularly polarized light and block left-handed circularly polarized light, which can be set according to the material properties of the optical adjustment layer 300, and the embodiment of the present application does not specifically limit it.

[0063] It should be noted that, in order to reduce the reflectivity of the reflective structure in the display panel to the external ambient light, a polarizer is usually set to reduce the reflectivity of the ambient light in the display panel. However, the setting of the polarizer will also cause the display panel to have low light output efficiency, relatively high power consumption, and short life. In particular, the light conversion efficiency of the blue light emitting material is low, which has a greater impact on the life of the blue light pixel.

[0064] In view of the above problems, the display panel provided by the embodiment of the present application is provided with an optical adjustment layer 300, and the optical adjustment layer 300 is used to transmit the first circularly polarized light L1 and block the second circularly polarized light L2. The first circularly polarized light L1 and the second circularly polarized light L2 have different rotation directions, so that the second circularly polarized light L2 is converted into the first circularly polarized light L1 after reflection and then passes through the optical adjustment layer 300. Then the light emitted or transmitted by the pixel unit 200 is not lost, and all are emitted from the optical adjustment layer 300, which can greatly improve the light output of the display panel, and thus improve the light output efficiency of the display screen of the display panel. The improvement of the light output efficiency of the display panel can reduce the driving power consumption of the display panel, that is, in the display effect of the same light output, the driving power consumption of the display panel provided by the embodiment of the present application is lower, which can further improve the service life of the display panel. In addition, the ambient light outside the display panel is incident on the optical adjustment layer 300 from the display side of the display panel, the first circularly polarized light L1 is transmitted and incident on the inside of the display panel, and the second circularly polarized light L2 is reflected and blocked outside the display panel, which can reduce the external ambient light from entering the display panel. The transmitted first circularly polarized light L1 undergoes a rotational change after being reflected by the internal reflective structure of the display panel to obtain the second circularly polarized light L2. The second circularly polarized light L2 is incident on the optical adjustment layer 300 again and cannot pass through. It can be blocked inside the display panel and cannot be emitted, which can reduce the amount of light reflected by the display panel for ambient light and can have the effect of reducing the reflectivity of ambient light. The reflectivity of ambient light can be maintained at a low level and will not affect the normal display of the display panel.

[0065] In some embodiments, the optical conditioning layer includes a cholesteric liquid crystal layer.

[0066] It should be noted that cholesteric liquid crystal is a term in fine chemical engineering, which refers to a layered structure like smectic liquid crystal, but the molecular arrangement within the layer is similar to nematic liquid crystal, and the molecular long axes are parallel to each other within the layer. The more prominent feature of this type of liquid crystal is that the molecular axis direction of each layer is slightly offset from the molecular axis direction of the adjacent layer, and the liquid crystal forms a spiral structure as a whole. The length of the pitch is on the order of the wavelength of visible light. The optical properties of cholesteric liquid crystal, such as optical activity, selective light scattering and circularly polarized light dichroism, are caused by this special spiral structure. Circularly polarized light dichroism can achieve the transmission of the first circularly polarized light and the blocking of the second circularly polarized light.

[0067] In some embodiments, the display panel provided in the embodiment of the present application further includes: an encapsulation layer and a touch layer, the encapsulation layer is arranged between the pixel unit and the optical adjustment layer, and when the pixel unit includes a light-emitting device, the encapsulation layer can be used to protect the light-emitting device to prevent the light-emitting device from being corroded by external water and oxygen. The touch layer can realize the touch function of the display panel, and the touch layer can be arranged between the encapsulation layer and the optical adjustment layer; the touch layer can also be arranged on the side of the optical adjustment layer away from the substrate layer. The touch layer can include touch electrodes, and the touch electrodes can be arranged in layers, which is not specifically limited in the embodiment of the present application.

[0068] For example, Figure 4 This is a schematic structural diagram of another display panel provided in an embodiment of the present application. Figure 4 As shown, the touch layer 500 is disposed between the encapsulation layer 400 and the optical adjustment layer 300 .

[0069] In some embodiments, the optical adjustment layer 300 includes a plurality of adjustment regions; the pixel unit 200 includes a plurality of sub-pixels, different sub-pixels are used to emit or transmit light of different colors, and the orthographic projection of the adjustment region on the substrate layer 100 covers the orthographic projection of the sub-pixel on the substrate layer 100; the central wavelength ranges of the adjustment regions corresponding to different sub-pixels are different, and the central wavelength range corresponding to the adjustment region is the wavelength range corresponding to the first circular polarization. The adjustment regions corresponding to different central wavelength ranges decompose the light of the corresponding sub-pixels, and 50% of the first circular polarization of the central wavelength range can be transmitted, and 50% of the second circular polarization of the central wavelength range is converted into the first circular polarization after reflection and then emitted from the adjustment region, which can improve the transmittance of the light emitted by the corresponding sub-pixel, and can improve the display contrast and visibility of the display panel. In addition, the power consumption can be reduced and the life of the display panel can be improved under the condition of meeting the transmittance required for normal display.

[0070] For example, Figure 5 This is a schematic structural diagram of another display panel provided in an embodiment of the present application. Figure 5As shown, the pixel unit 200 includes a first sub-pixel 210, a second sub-pixel 220 and a third sub-pixel 230. A pixel defining structure 201 is provided between adjacent sub-pixels. The optical adjustment layer 300 includes a first adjustment region 310, a second adjustment region 320 and a third adjustment region 330, wherein the first adjustment region 310 corresponds to the first sub-pixel 210, the second adjustment region 320 corresponds to the second sub-pixel 220, and the third adjustment region 330 corresponds to the third sub-pixel 230. For example, if the first sub-pixel 210 emits or transmits red light, the central wavelength range of the first adjustment area 310 may be the red light band, the first circular polarization of the red light band may transmit through the first adjustment area 310, and the second circular polarization of the red light band may be blocked by the first adjustment area 310; if the second sub-pixel 220 emits or transmits green light, the central wavelength range of the second adjustment area 320 may be the green light band, the first circular polarization of the green light band may transmit through the second adjustment area 320, and the second circular polarization of the green light band may be blocked by the second adjustment area 320; if the third sub-pixel 230 emits or transmits blue light, the central wavelength range of the third adjustment area 330 may be the blue light band, the first circular polarization of the blue light band may transmit through the third adjustment area 330, and the second circular polarization of the blue light band may be blocked by the third adjustment area 330.

[0071] In some embodiments, the optical adjustment layer to which the adjustment regions corresponding to all different sub-pixels belong is disposed in the same layer. Figure 5 As shown, the sub-pixels and the adjustment regions can be one-to-one corresponding, and the optical adjustment layers of the adjustment regions corresponding to all the sub-pixels are integrated in the same film layer, which can reduce the film layer setting of the display panel and reduce the thickness of the display panel. Different adjustment regions correspond to different central wavelength ranges, and the optical adjustment material properties of different adjustment regions are different, such as the pitch of the helical structure of the cholesteric liquid crystal is differentiated.

[0072] In some embodiments, the pitch of the helical liquid crystal molecules of the cholesteric liquid crystal layer is determined according to the central wavelength range corresponding to the adjustment region. Different adjustment regions can be prepared separately, and the production process can be set according to material properties and process design, which is not specifically limited in the embodiments of the present application.

[0073] It should be noted that Figure 5 The number of sub-pixels included in the pixel unit 200 shown is only for illustration and is not intended to be a specific limitation of the embodiments of the present application.

[0074] The display panel provided in the embodiment of the present application sets adjustment areas corresponding to different sub-pixels, and the adjustment areas specifically decompose the light bands of the sub-pixels, that is, part of the first circularly polarized light is transmitted, and part of the second circularly polarized light with the opposite rotation direction is blocked. The blocked second circularly polarized light is converted into the first circularly polarized light after reflection and then emitted, which can further improve the transmittance of the display light in the whole band, thereby reducing the driving power consumption of the display panel and improving the service life.

[0075] In some embodiments, the optical adjustment layer to which the adjustment regions corresponding to at least two different sub-pixels belong is disposed in the same layer. Exemplarily, an optical adjustment layer may be provided with adjustment regions corresponding to two or more different sub-pixels, and the number of layers of the optical adjustment layer may be at least two layers, and the adjustment regions are allocated specifically according to the number of sub-pixel types and resolution settings, which is not specifically limited in the embodiments of the present application.

[0076] In some embodiments, the number of layers of the optical adjustment layer 300 is the same as the number of types of sub-pixels in each pixel unit 200, each layer of the optical adjustment layer 300 corresponds to a target sub-pixel, and each layer of the optical adjustment layer 300 includes multiple adjustment areas and normal transmission areas, the adjustment area is used to transmit the first circularly polarized light corresponding to the target sub-pixel and block the second circularly polarized light, and the normal transmission area is used to transmit light from other sub-pixels other than the target sub-pixel, and the target sub-pixel is a sub-pixel in the pixel unit.

[0077] For example, Figure 6 This is a schematic structural diagram of another display panel provided in an embodiment of the present application. Figure 6As shown, the first adjustment area 310, the second adjustment area 320 and the third adjustment area 330 are arranged in different layers of the optical adjustment layer 300. The first adjustment area 310 is arranged corresponding to the first sub-pixel 210, and the first sub-pixel 210 is the target sub-pixel corresponding to the first adjustment area 310; the second adjustment area 320 is arranged corresponding to the second sub-pixel 220, and the second sub-pixel 220 is the target sub-pixel corresponding to the second adjustment area 320; the third adjustment area 330 is arranged corresponding to the third sub-pixel 230, and the third sub-pixel 230 is the target sub-pixel corresponding to the third adjustment area 330. The area outside the first adjustment area 310 in the optical adjustment layer 300 to which the first adjustment area 310 belongs is provided with a normal transmission area 301, that is, the normal transmission area 301 in the optical adjustment layer 300 to which the first adjustment area 310 belongs corresponds to the second sub-pixel 220 and the third sub-pixel 230. The area outside the second adjustment area 320 in the optical adjustment layer 300 to which the second adjustment area 320 belongs is provided with a normal transmission area 301, that is, the normal transmission area 301 in the optical adjustment layer 300 to which the second adjustment area 320 belongs corresponds to the first sub-pixel 210 and the third sub-pixel 230. The area outside the third adjustment area 330 in the optical adjustment layer 300 to which the third adjustment area 330 belongs is provided with a normal transmission area 301, that is, the normal transmission area 301 in the optical adjustment layer 300 to which the third adjustment area 330 belongs corresponds to the first sub-pixel 210 and the second sub-pixel 220. The normal transmission area 301 can transmit light of the full wavelength band and will not affect the emission of light emitted by other sub-pixels other than the corresponding target sub-pixel.

[0078] Exemplary, reference Figure 6 The normal transmission area 301 can be filled with transparent optical glue, which can have better light transmission performance.

[0079] In some embodiments, the normal transmission area includes a color filter film, which can improve display color deviation and has a color correction effect.

[0080] For example, Figure 7 This is a schematic structural diagram of a display panel provided in an embodiment of the present application. Figure 7As shown, the normal transmission area of ​​the optical adjustment layer 300 to which the first adjustment area 310 belongs may be provided with a second color filter 620 and a third color filter 630, and the normal transmission area of ​​the optical adjustment layer 300 to which the second adjustment area 320 belongs may be provided with a first color filter 610, the first color filter 610 is provided at a position corresponding to the first sub-pixel 210, the second color filter 620 is provided at a position corresponding to the second sub-pixel 220, and the third color filter 630 is provided at a position corresponding to the third sub-pixel 230. The first color filter 610 may filter the light of the wavelength band of the first sub-pixel 210, the second color filter 620 may filter the light of the wavelength band of the second sub-pixel 220, and the third color filter 630 may filter the light of the wavelength band of the third sub-pixel 230.

[0081] It should be noted that the color filter film can be arranged in the normal transmission area 301 of two or more optical adjustment layers 300, and the color filter film can be arranged in two or more layers, which is not specifically limited in the embodiment of the present application.

[0082] The display panel provided in the embodiment of the present application integrates the color filter film in the normal transmission area 301 of the optical adjustment layer 300 according to the sub-pixel arrangement and the setting of the adjustment area, which can reduce the thickness of the film layer through which light passes and simplify the film layer structure.

[0083] In some embodiments, the number of layers of the optical adjustment layer 300 is the same as the number of types of sub-pixels in each pixel unit, different layers of the optical adjustment layer 300 correspond to different sub-pixels, and different layers of the optical adjustment layer 300 correspond to different central wavelength ranges. Figure 8 This is a schematic structural diagram of another display panel provided in an embodiment of the present application. Figure 8As shown, the pixel unit 200 includes a first sub-pixel 210, a second sub-pixel 220 and a third sub-pixel 230. The first sub-pixel 210, the second sub-pixel 220 and the third sub-pixel 230 may correspond to different light bands respectively. The first sub-pixel 210 may include a first light-emitting device, the second sub-pixel 220 may include a second light-emitting device, and the third sub-pixel 230 may include a third light-emitting device. The colors of the light emitted by the first light-emitting device, the second light-emitting device and the third light-emitting device are different. The optical adjustment layer 300 may have three layers, namely a first optical adjustment layer 302, a second optical adjustment layer 303 and a third optical adjustment layer 304. The central wavelength range of the first optical adjustment layer 302 is the wavelength band of the light emitted by the first light-emitting device, the central wavelength range of the second optical adjustment layer 303 is the wavelength band of the light emitted by the second light-emitting device, and the central wavelength range of the third optical adjustment layer 304 is the wavelength band of the light emitted by the third light-emitting device. The first optical adjustment layer 302 , the second optical adjustment layer 303 and the third optical adjustment layer 304 are all arranged as a whole layer, which can improve the transmittance of light in the entire visible light band.

[0084] Exemplary, reference Figure 8 The display panel provided in the embodiment of the present application may further include a color filter layer, and the color filter layer may include a first color filter film 610 , a second color filter film 620 , a third color filter film 630 and a shading matrix 640 .

[0085] In some embodiments, the display panel provided in the embodiment of the present application further includes: a circular polarizer, which is disposed on the side of the optical adjustment layer 300 away from the substrate layer 100; the circular polarizer may include a linear polarizer and a phase retardation film, which is disposed between the optical adjustment layer 300 and the linear polarizer. The phase retardation film can be used for conversion between circular polarization and linear polarization, and the linear polarizer can play a role in filtering light, and can play a role in reducing reflection of external ambient light.

[0086] For example, Fig. 9 This is another optical path schematic diagram of a display panel provided in an embodiment of the present application. Fig. 9 As shown, the first circularly polarized light L1 transmitted from the optical adjustment layer 300 is converted into linearly polarized light L3 through the phase delay film 710, and the linearly polarized light L3 can pass through the linear polarizer 720. The setting of the circular polarizer will not affect the normal emission of the display light of the display panel, and can ensure the high transmittance of the display screen light of the display panel. The optical adjustment layer 300 has played a role in blocking and reducing the reflected light of the ambient light.

[0087] It should be noted that, exemplarily, when the optical adjustment layer adopts a cholesteric liquid crystal layer, and the spiral structure of the liquid crystal molecules of the cholesteric liquid crystal layer satisfies the right-hand spiral rule, that is, the liquid crystal molecules are arranged in a right-hand spiral structure, and what can be transmitted is the left-handed first circular polarization, and what is blocked is the right-handed second circular polarization. At this time, the corresponding circular polarizer should be left-handed, that is, the optical axis needs to meet the left-handed condition, and the left-handed first circular polarization can be converted into linear polarization, and the linear polarization can be transmitted from the linear polarizer, and the optical axis of the circular polarizer and the absorption axis of the linear polarizer need to meet the left-handed 45° angle relationship. It can be understood that the liquid crystal spiral hand direction of the cholesteric liquid crystal layer has a corresponding relationship with the optical axis of the circular polarizer and the absorption axis of the linear polarizer, so that the light of the display panel can be normally emitted for picture display. Exemplarily, the spiral structure of the liquid crystal molecules in the cholesteric liquid crystal layer satisfies the left-handed spiral rule, that is, the liquid crystal molecules are arranged in a left-handed spiral structure, and what can be transmitted is the right-handed first circularly polarized light, and what is blocked is the left-handed second circularly polarized light. At this time, the corresponding circular polarizer should be right-handed, that is, the optical axis needs to satisfy the right-handed condition. The right-handed first circularly polarized light can be converted into linear polarized light, and the linear polarized light can be transmitted through the linear polarizer. The optical axis of the circular polarizer and the absorption axis of the linear polarizer need to satisfy a right-handed 45° angle relationship.

[0088] Exemplary, reference Fig. 9 After the ambient light enters from the linear polarizer 720, half of the light is blocked, and the linear polarized light L3 perpendicular to the absorption axis of the linear polarizer 720 will be transmitted, which can play a role in reducing reflection.

[0089] In some embodiments, the phase delay film may include a first phase delay film and a second phase delay film. The first phase delay film may be a half wave plate, and the second phase delay may be a quarter wave plate. Exemplarily, the first phase delay film may include a cholesteric liquid crystal layer, and the second phase delay film may include a cholesteric liquid crystal layer. The angle between the slow axis of the first phase delay film and the absorption axis of the linear polarizer is a first angle, and the angle between the slow axis of the second phase delay film and the absorption axis of the linear polarizer is a second angle, and the second angle is linearly related to the first angle. The phase delay film can be made to realize the mutual conversion between circular polarization and linear polarization, and the converted linear polarization can pass through the linear polarizer.

[0090] For example, Fig.10 This is a schematic structural diagram of a circular polarizer provided in an embodiment of the present application. Fig.10 As shown, the circular polarizer includes a pressure-sensitive adhesive layer PSA, a second phase retardation film LC2, a third bonding layer 703, a first phase retardation film LC1, a second bonding layer 702, a functional adhesive film layer PVA, a first bonding layer 701 and a substrate 704. The substrate 704 is arranged on the side close to the display side as the light emitting surface.

[0091] refer to Fig.10 , the first adhesive layer 701, the second adhesive layer 702 and the third adhesive layer 703 may include UV adhesive, pressure-sensitive adhesive, thermosetting water adhesive, etc. The functional adhesive film layer PVA may be an iodine-based stretched linear polarization functional film, which has the function of converting natural light into linear polarized light, and the functional adhesive film layer PVA has an absorption axis. LC1 is a half-wave plate, which contains a fast axis and a slow axis in a plane parallel to the panel, and the light wave passes through the LC1 film to produce a phase difference of half a wavelength. LC2 is a quarter-wave plate, which contains a fast axis and a slow axis in a plane parallel to the panel, and the light wave passes through the LC2 film to produce a phase difference of a quarter wavelength. The absorption axis direction of PVA forms a specific acute angle α≈15° with the slow axis direction of the LC1 film layer, that is, the first angle is α, and the absorption axis direction of PVA forms an angle of 2α+45° with the slow axis direction of the LC2 film layer, that is, the second angle is 2α+45°.

[0092] Exemplary, reference Figure 8 , the third optical adjustment layer 304 can only work for green light, the second optical adjustment layer 303 can only work for red light, and the first optical adjustment layer 302 can only work for blue light. The third optical adjustment layer 304 can decompose the green light emitted by the panel into about 50% right-handed light that is transmitted, and 50% left-handed light that is reflected back to the panel, becomes right-handed light after being reflected by the panel, and then passes through the third optical adjustment layer 304, and then normally emits the module, but it will not decompose the red light and blue light emitted by the panel. The second optical adjustment layer 303 can decompose the red light emitted by the panel into about 50% right-handed light that is transmitted and then normally emits the module, and 50% left-handed light that is reflected back to the panel, becomes right-handed light after being reflected by the panel, and then emits the module, but it will not decompose the green light and blue light emitted by the panel. The first optical adjustment layer 302 can decompose the blue light emitted by the panel into about 50% right-handed light emitting from the module, and 50% left-handed light is reflected back to the panel, and after being reflected by the panel, it becomes right-handed light and then normally emits the module, but it will not decompose the red light and green light emitted by the panel. It can enhance the brightness of green light, red light and blue light respectively. Under the same current drive, the brightness of green light can be enhanced by more than 35%, the brightness of red light can be enhanced by more than 32%, the brightness of blue light can be enhanced by more than 25%, and the brightness of white light can be enhanced by more than 30%. Power consumption can be reduced by more than 22%. At the same time, this structure has excellent reflectivity and reflective hue. The reflectivity can be controlled below 6%, and it can also reduce the reflection of ambient light.

[0093] In some embodiments, the pixel unit 200 may include a red sub-pixel, a green sub-pixel, and a blue sub-pixel; the red sub-pixel may emit or transmit red light, the green sub-pixel may emit or transmit filtered light, and the blue sub-pixel may emit or transmit blue light. The central wavelength range of the optical adjustment layer corresponding to the red sub-pixel may be 600nm to 650nm, for example, 615nm, and the half-peak width of the spectrum of the optical adjustment layer corresponding to the red sub-pixel is 5nm to 100nm, for example, 70nm. The spectrum of the optical adjustment layer may be a relationship spectrum of the wavelength and light intensity of the decomposed light, that is, a relationship spectrum of the wavelength of the first circularly polarized light that can pass through the optical adjustment layer and the transmitted light intensity. The wavelength range corresponding to the stronger light intensity of this spectrum is the central wavelength range of the corresponding optical adjustment layer, and the width of half of the peak of the central wavelength range is the half-peak width.

[0094] In some embodiments, the central wavelength range corresponding to the green sub-pixel is 520nm to 550nm, for example, 530nm, and the half-peak width of the spectrum of the optical adjustment layer corresponding to the green sub-pixel is 5nm to 100nm, for example, 60nm.

[0095] In some embodiments, the central wavelength range corresponding to the blue sub-pixel is 450nm to 480nm, for example, 460nm, and the half-peak width of the spectrum of the optical adjustment layer corresponding to the blue sub-pixel is 5nm to 100nm, for example, 55nm.

[0096] For example, Fig.11 This is a reflection spectrum of an optical adjustment layer of a display panel provided in an embodiment of the present application. Fig.11 As shown, the horizontal axis of the reflection spectrum is wavelength, in nm, and the vertical axis is reflectivity. Since the main reference spectrum trend is used, the specific data is not marked. The main action band of the blue light optical adjustment layer BLC is the blue light band, that is, the central wavelength is the blue light band; the main action band of the green light optical adjustment layer GLC is the green light band, that is, the central wavelength is the green light band; the main action band of the red light optical adjustment layer RLC is the red light band.

[0097] For example, Fig.12 A white light spectrum of a display panel provided in an embodiment of the present application. Fig.12 As shown, the horizontal axis is wavelength, in nm, and the vertical axis is light intensity. Since only the size of the contour needs to be compared, the vertical axis value is not marked. Under the same current drive, the white light spectrum profile of the display panel with an optical adjustment layer is P1, and the white light spectrum profile of the display panel without an optical adjustment layer is P2. Fig.12It can be seen that the white light spectrum profile P1 of the display panel provided with the optical adjustment layer is significantly greater than the white light spectrum profile P2 of the display panel not provided with the optical adjustment layer. The white light spectrum of the display panel provided with the optical adjustment layer is better than the white light spectrum of the display panel not provided with the optical adjustment layer. Therefore, providing the optical adjustment layer can reduce the driving power consumption of the display panel.

[0098] For example, Fig.13 A red light spectrum of a display panel provided in an embodiment of the present application; Fig.14 A green light spectrum of a display panel provided in an embodiment of the present application; Fig.15 A blue light spectrum of a display panel provided in an embodiment of the present application. Figure 13-Figure 15 The horizontal axis is the wavelength, in nm, and the vertical axis is the light intensity. It is just a comparison and no numerical value is indicated. Figure 13-Figure 15 The dotted line in the figure is the spectral profile of the display panel without the optical adjustment layer under the same current drive, and the solid line is the spectral profile of the display panel with the optical adjustment layer under the same current drive. It can be seen that the solid line profile is greater than the dotted line profile, and the sub-pixel monochrome spectrum of the display panel with the optical adjustment layer is better than the sub-pixel monochrome spectrum of the display panel without the optical adjustment layer. Therefore, setting the optical adjustment layer can reduce the driving power consumption of the display panel. The red light brightness can be increased by 32.6%, the green light brightness can be increased by 35.2%, the blue light brightness can be increased by 25.8%, and the white light brightness can be increased by 33.8%.

[0099] For example, Fig.16 A reflectivity curve of a display panel provided in an embodiment of the present application. Fig.16 As shown in the figure, the relationship between the reflectivity and wavelength of the display panel is shown in the figure. The horizontal axis is the wavelength in nm and the vertical axis is the reflectivity in %. Fig.16 It can be seen that the reflectivity of the display panel with an optical adjustment layer to the visible light band of the ambient light can be controlled at an average of about 4.8%, and the reflection hue coordinates can reach: a*=1.46, b*=-0.9. While improving the light extraction efficiency of the display panel, it can also ensure that the reflectivity of the display panel to the ambient light is controlled at a low level, which can reduce power consumption while ensuring the display effect of the display panel.

[0100] According to a second aspect of the embodiments of the present application, a display device is provided. Fig.17 This is a schematic structural diagram of a display device provided in an embodiment of the present application. Fig.17 As shown, the display device provided in the embodiment of the present application includes: the display panel 1000 as described in the first aspect.

[0101] It should be noted that the display device provided in the embodiment of the present application can be a smart phone, a tablet computer, a laptop computer, a television, a supporting wearable device or other display, etc., and the embodiment of the present application is not specifically limited.

[0102] The display device provided by the embodiment of the present application is provided with an optical adjustment layer through a display panel, and the optical adjustment layer is used to transmit the first circular polarization and block the second circular polarization. The first circular polarization and the second circular polarization have different rotation directions, so that the second circular polarization is converted into the first circular polarization after reflection and then transmits from the optical adjustment layer. Then the light emitted or transmitted by the pixel unit is not lost, and all are emitted from the optical adjustment layer, which can greatly improve the light output of the display panel, and then improve the light output efficiency of the display screen of the display panel. The improvement of the light output efficiency of the display panel can reduce the driving power consumption of the display panel, that is, in the display effect of the same light output, the driving power consumption of the display panel provided by the embodiment of the present application is lower, which can further improve the service life of the display panel. In addition, the ambient light outside the display panel is incident on the optical adjustment layer from the display side of the display panel, the first circular polarization is transmitted and incident on the inside of the display panel, and the second circular polarization is reflected and blocked outside the display panel, which can reduce the external ambient light from entering the display panel. The first circularly polarized light that passes through is reflected by the reflective structure inside the display panel and changes its direction of rotation to obtain a second circularly polarized light. The second circularly polarized light enters the optical adjustment layer again and cannot pass through. It can be blocked inside the display panel and cannot be emitted, which can reduce the amount of light reflected by the display panel for ambient light and can reduce the reflectivity of ambient light. The reflectivity of ambient light can be maintained at a low level and will not affect the normal display of the display panel.

[0103] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0104] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0105] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.

[0106] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.

Claims

1. A display panel, characterized in that: include: substrate layer; A plurality of pixel units are arranged on one side of the substrate layer; At least one optical adjustment layer is disposed on a side of the pixel unit away from the substrate layer; The optical adjustment layer is used to transmit a first circularly polarized light and block a second circularly polarized light, wherein the first circularly polarized light and the second circularly polarized light have different rotation directions, so that the second circularly polarized light is converted into the first circularly polarized light after being reflected and then transmitted through the optical adjustment layer; The optical adjustment layer includes a cholesteric liquid crystal layer; The optical adjustment layer includes a plurality of adjustment regions; The pixel unit includes a plurality of sub-pixels, different sub-pixels are used to emit or transmit light of different colors, and the orthographic projection of the adjustment area on the substrate layer covers the orthographic projection of the sub-pixel on the substrate layer; The central wavelength ranges of the adjustment areas corresponding to different sub-pixels are different, and the central wavelength range corresponding to the adjustment area is the wavelength range corresponding to the first circularly polarized light; The number of layers of the optical adjustment layer is the same as the number of types of the sub-pixels in each of the pixel units, each layer of the optical adjustment layer corresponds to a target sub-pixel, and each layer of the optical adjustment layer includes a plurality of adjustment areas and a normal transmission area, the adjustment area is used to transmit the first circularly polarized light corresponding to the target sub-pixel and block the second circularly polarized light, and the normal transmission area is used to transmit the light of the other sub-pixels except the target sub-pixel; The normal transmission area includes a color filter film.

2. The display panel according to claim 1, characterized in that: In the case where the optical adjustment layer includes the cholesteric liquid crystal layer, the pitch of the spirally arranged liquid crystal molecules of the cholesteric liquid crystal layer is determined according to the central wavelength range corresponding to the adjustment region.

3. The display panel according to claim 1, characterized in that: The adjustment areas corresponding to all the different sub-pixels are arranged in the same layer of the optical adjustment layer.

4. The display panel according to claim 1, characterized in that: The optical adjustment layer to which the adjustment regions corresponding to at least two different sub-pixels belong is disposed in the same layer.

5. The display panel according to claim 1, characterized in that: The pixel unit includes multiple sub-pixels, different sub-pixels are used to emit or transmit light of different colors, the number of layers of the optical adjustment layer is the same as the number of types of the sub-pixels in each of the pixel units, different layers of the optical adjustment layer correspond to different sub-pixels, and different layers of the optical adjustment layer correspond to different central wavelength ranges.

6. The display panel according to claim 1, characterized in that: The pixel unit includes a red sub-pixel, a green sub-pixel and a blue sub-pixel; The central wavelength range corresponding to the red sub-pixel is 600nm to 650nm, and the half-peak width of the spectrum of the optical adjustment layer corresponding to the red sub-pixel is 5nm to 100nm; and / or, The central wavelength range corresponding to the green sub-pixel is 520nm to 550nm, and the half-peak width of the spectrum of the optical adjustment layer corresponding to the green sub-pixel is 5nm to 100nm; and / or, The central wavelength range corresponding to the blue sub-pixel is 450nm to 480nm, and the half-peak width of the spectrum of the optical adjustment layer corresponding to the blue sub-pixel is 5nm to 100nm.

7. The display panel according to claim 1, characterized in that: Also includes: A circular polarizer, disposed on a side of the optical adjustment layer away from the substrate layer; The circular polarizer includes a linear polarizer and a phase retardation film, and the phase retardation film is arranged between the optical adjustment layer and the linear polarizer.

8. The display panel according to claim 7, characterized in that: The phase delay film includes a first phase delay film and a second phase delay film; The angle between the slow axis of the first phase delay film and the absorption axis of the linear polarizer is a first angle, the angle between the slow axis of the second phase delay film and the absorption axis of the linear polarizer is a second angle, and the second angle is linearly related to the first angle.

9. The display panel according to claim 8, characterized in that: The first phase delay film is a half wave plate, and the second phase delay film is a quarter wave plate; and / or, The first phase retardation film and / or the second phase retardation film includes a cholesteric liquid crystal layer.

10. The display panel according to claim 1, characterized in that: Also includes: An encapsulation layer, disposed between the pixel unit and the optical adjustment layer; A touch layer, wherein the touch layer is disposed between the encapsulation layer and the optical adjustment layer, or the touch layer is disposed on a side of the optical adjustment layer away from the substrate layer.

11. A display device, characterized in that: include: A display panel as claimed in any one of claims 1 to 10.

Images