Display panel and display device

Abstract

The present application provides a display panel, which relates to the field of display technology. The display panel includes a substrate, at least one light-emitting device, a quarter-wave plate, a polarizer, and at least one adjustable phase difference layer. At least one light-emitting device is arranged on the substrate. The quarter-wave plate is arranged on the side of the light-emitting device away from the substrate. The polarizer is arranged on the side of the quarter-wave plate away from the substrate. The adjustable phase difference layer is arranged between the polarizer and the light-emitting device, and is configured to be switchable between an optical lens state and a phase difference film state. In the optical lens state, the adjustable phase difference layer maintains the polarization state of the transmitted light passing through it. In the phase difference film state, the adjustable phase difference layer enables the polarized light passing through it to be switchable between circularly polarized light and linearly polarized light. The design of the adjustable phase difference layer enables the reflected light to be reused during fingerprint recognition, reduces the brightness requirements of the display panel for the light-emitting device, and improves the life of the light-emitting device.

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] With the development of display technology, people are placing higher performance demands on display devices. Various biometric technologies are being applied to display devices. For example, fingerprint recognition technology is widely used in display devices due to its high security performance and simple implementation. However, fingerprint recognition applications require higher brightness of the display device. The brightness of the fingerprint recognition area is often higher than the brightness of the normal display device in high-brightness mode. This accelerates the aging of the fingerprint recognition area, causing the color of the fingerprint area to appear dark or yellow during full-screen display, thus affecting the display quality of the display device. Summary of the Invention

[0003] A first aspect of the present application provides a display panel comprising a substrate, at least one light-emitting device, a quarter-wave plate, a polarizer, and at least one adjustable phase difference layer. The at least one light-emitting device is disposed on the substrate. The quarter-wave plate is disposed on a side of the light-emitting device facing away from the substrate. The polarizer is disposed on a side of the quarter-wave plate facing away from the substrate. The adjustable phase difference layer is disposed between the polarizer and the light-emitting device and is configured to be switchable between an optical lens state and a phase difference film state. In the optical lens state, the adjustable phase difference layer maintains the polarization state of light transmitted therethrough. In the phase difference film state, the adjustable phase difference layer enables the polarized light transmitted therethrough to be switchable between circularly polarized light and linearly polarized light.

[0004] In the above scheme, the adjustable phase difference layer designed in the display panel cooperates with the quarter-wave plate included in the display panel to shield the extinction effect of the polarizer on the reflected light of the display panel, thereby improving the utilization rate of light, thereby reducing the brightness requirement of the light-emitting device and increasing the life of the light-emitting device.

[0005] In combination with the first aspect, in some embodiments, the orthographic projection of the adjustable phase difference layer on the substrate coincides with the orthographic projection of the light-emitting layer of the light-emitting device on the substrate.

[0006] In the above solution, the adjustable phase difference layer can maximize the contact with the reflected light of the light-emitting device, thereby more efficiently improving the utilization of the reflected light.

[0007] In combination with the first aspect, in some embodiments, the adjustable phase difference layer has at least one opening, and the orthographic projection of the opening on the substrate falls within the orthographic projection of the light-emitting layer of the light-emitting device on the substrate.

[0008] In the above solution, the setting scheme of the adjustable phase difference layer enables the display panel to selectively reuse the reflected light in a certain area or part of the light-emitting device. At the same time, the opening is set so that the adjustable phase difference layer basically does not affect the display effect of the display panel.

[0009] In combination with the first aspect, in some embodiments, the display panel includes a first light-emitting device that emits a first color light, a second light-emitting device that emits a second color light, and a third light-emitting device that emits a third color light, and the wavelength of the first color light is greater than the wavelength of the second color, the wavelength of the second color light is greater than the wavelength of the third color light, and the adjustable phase difference layer is arranged between the second light-emitting device and the polarizer.

[0010] In the above solution, the second light emitting device at the middle wavelength has the highest luminous brightness. The adjustable phase difference layer provided thereon can substantially not affect the display effect of the display panel while more effectively improving the utilization of reflected light.

[0011] In conjunction with the first aspect, in some embodiments, a plurality of adjustable phase difference layers are provided: an adjustable phase difference layer is provided between the first light emitting device and the polarizer, and an adjustable phase difference layer is provided between the second light emitting device and the polarizer.

[0012] In combination with the first aspect, in some embodiments, a plurality of adjustable phase difference layers are provided: an adjustable phase difference layer is provided between the second light emitting device and the polarizer, and an adjustable phase difference layer is provided between the third light emitting device and the polarizer.

[0013] In conjunction with the first aspect, in some embodiments, a plurality of adjustable phase difference layers are provided: an adjustable phase difference layer is provided between the first light-emitting device and the polarizer, an adjustable phase difference layer is provided between the second light-emitting device and the polarizer, and an adjustable phase difference layer is provided between the third light-emitting device and the polarizer.

[0014] In combination with the first aspect, in some embodiments, in the phase difference film state, the phase difference of the adjustable phase difference layer is (1 / 4+n) times the wavelength of light emitted by the corresponding light-emitting device, where n is an integer and n≥0.

[0015] In conjunction with the first aspect, in some embodiments, the adjustable phase difference layer includes a first electrode, a second electrode, and a phase difference conversion layer. The phase difference conversion layer is located between the first electrode and the second electrode. The phase difference conversion layer can be switched between an optical lens state and a phase difference film state under the action of an electric field. In the phase difference film state, the phase difference of the phase difference conversion layer is (1 / 4 + n) times the wavelength of light emitted by the corresponding light-emitting device, where n is an integer and n ≥ 0. Furthermore, the first electrode, the second electrode, and the phase difference conversion layer are co-layered.

[0016] In the above solution, by controlling the intensity of the electric field formed between the first electrode and the second electrode, the switching of the phase difference conversion layer between different functional modes can be controlled. This method is simple and easy to implement.

[0017] In combination with the first aspect, in some embodiments, the material of the adjustable phase difference layer is lithium niobate crystal.

[0018] In combination with the first aspect, in some embodiments, the display panel further includes a fingerprint sensor, which is disposed on a side of the substrate facing away from the light-emitting device. Furthermore, the substrate is a transparent substrate.

[0019] In combination with the first aspect, in some embodiments, the display panel further includes a fingerprint sensor, which is disposed on the substrate on the same side as the light-emitting device and is located around the light-emitting device.

[0020] In the above solution, the fingerprint sensor design is integrated with the display panel structure, which is conducive to making the display panel lighter and thinner.

[0021] In combination with the first aspect, in some embodiments, the display panel includes a display area and a non-display area, the display area includes a first area and a second area, the second area includes a plurality of pixel areas, and an adjustable phase difference layer is provided in at least one pixel area.

[0022] In the above scheme, an adjustable phase difference layer is set in some areas, such as the pixel area in the fingerprint recognition area, according to the functional requirements of the display panel. While not affecting the display effect of the display panel, it also improves the life of the light-emitting devices in some areas of the display panel, such as the pixel area in the fingerprint recognition area, thereby improving the overall performance of the display panel.

[0023] A second aspect of the present application provides a display device, which includes the display panel of any one of the first aspects above. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of a display panel according to an embodiment of the present application.

[0025] Figure 2 This is a light path diagram of a light-emitting device of a display panel according to an embodiment of the present application.

[0026] Figure 3 This is a light path diagram of a light-emitting device of a display panel in another embodiment of the present application.

[0027] Figure 4 is a cross-sectional view of a display panel in one embodiment of the present application.

[0028] Figure 5 is a cross-sectional view of a display panel in another embodiment of the present application.

[0029] Figure 6 is a cross-sectional view of a display panel in one embodiment of the present application.

[0030] Figure 7 is a cross-sectional view of a display panel in one embodiment of the present application.

[0031] Figure 8 is a cross-sectional view of a display panel in another embodiment of the present application.

[0032] Figure 9 FIG. 1 is a plan view of a display panel in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] In the existing display field, some display devices place the photosensitive module under the display screen, that is, use the fingerprint sensor imaging method to apply the under-screen fingerprint technology under the OLED substrate, which helps to further improve the screen-to-body ratio of the display device. Specifically, the light emitted by the OLED substrate configured in the display panel reaches the finger through the 1 / 4 wave plate and linear polarizer set on the outer surface of the display panel. The light reflected back by the finger is reflected again by the linear polarizer and 1 / 4 wave plate, returns to the display panel and penetrates the light-permeable area of ​​the display panel to reach the fingerprint sensor, thereby forming an image. Since the reflected light in the area where the fingerprint recognition module is located is stronger than the reflected light in other areas of the display panel, the corresponding light-emitting device of the fingerprint recognition module ages faster, thereby affecting the display effect of the display panel.

[0035] An embodiment of the present application provides a display panel, which includes a substrate, at least one light-emitting device, a quarter-wave plate, a polarizer, and at least one adjustable phase difference layer. At least one light-emitting device is arranged on the substrate. The quarter-wave plate is arranged on the side of the light-emitting device away from the substrate, and the phase difference of the quarter-wave plate is (1 / 4+n)λ, n is an integer and n≥0. The polarizer is arranged on the side of the quarter-wave plate away from the substrate. The adjustable phase difference layer is arranged between the polarizer and the light-emitting device, and is configured to be switchable between an optical lens state and a phase difference film state. In the optical lens state, the adjustable phase difference layer maintains the polarization state of the transmitted light passing through it. In the phase difference film state, the adjustable phase difference layer enables the polarized light passing through it to be switchable between circularly polarized light and linearly polarized light, that is, the phase difference of the adjustable phase difference layer in the phase difference film state is (1 / 4+n)λ. When the adjustable phase difference layer is used as an optical lens, it basically does not affect the luminous efficiency of the display panel. When the adjustable phase difference layer is used as a phase difference film, it cooperates with the quarter-wave plate included in the display panel to shield the extinction effect of the polarizer on the reflected light of the display panel, and reuses the reflected light, thereby improving the light utilization rate, thereby reducing the brightness requirement of the light-emitting device and increasing the life of the light-emitting device.

[0036] For example, Figure 1 As shown, the display panel 10 includes a substrate 11, a light-emitting device 12 located on the substrate 11, and a quarter-wave plate 13 and a polarizer 14 stacked in sequence on the side of the light-emitting device 12 facing away from the substrate 11. The light-emitting device 12 includes a first light-emitting device 121, a second light-emitting device 122, and a third light-emitting device 123, and includes only one adjustable phase difference layer 15, which is disposed on the side of the first light-emitting device 121 facing the quarter-wave plate 13. This allows the reflected light of the first light-emitting device 121 to be fully utilized, reducing the brightness requirement of the first light-emitting device 121 for fingerprint recognition.

[0037] In order to better understand the effect of providing an adjustable phase difference layer on improving the life of the light emitting device, this embodiment further provides the light path changes of the first light emitting device before and after providing the adjustable phase difference layer, as follows.

[0038] In the state where the adjustable phase difference layer is not provided on the first light emitting device, the optical path of the fingerprint recognition is as follows Figure 2As shown. The natural light A emitted by the first light-emitting device 121 first passes through the quarter-wave plate 13, and its polarization state remains unchanged. Then, after passing through the polarizer 14, its polarization state changes, becoming transverse linearly polarized light A1. The transverse linearly polarized light A1 is reflected by the object to be identified to form reflected light B. The reflected light B is transverse linearly polarized light. The polarization state of the reflected light B remains unchanged after passing through the polarizer 14. Then, the polarization state of the reflected light B changes again after passing through the quarter-wave plate 13, becoming clockwise circularly polarized reflected light B1. The clockwise circularly polarized reflected light B1 is reflected by the first light-emitting device 121 to form counterclockwise circularly polarized reflected light C. The polarization state of the reflected light C changes after passing through the quarter-wave plate 13, becoming longitudinal linearly polarized light C1. The reflected light C cannot pass through the polarizer 14, which only allows transverse linearly polarized light to pass through.

[0039] An adjustable phase difference layer is provided on the first light emitting device, and the adjustable phase difference layer is in the state of an optical lens. The adjustable phase difference layer has no effect on the polarization state of light. That is, when the display panel is in the display state, the adjustable phase difference layer is in the state of an optical lens, and has no effect on the light path of the corresponding light emitting device in the display panel. The light path diagram of the corresponding light emitting device is the same as Figure 2 The same, I will not go into details here.

[0040] An adjustable phase difference layer is provided on the first light emitting device, and the adjustable phase difference layer is in the state of a phase difference film. The optical path of the fingerprint recognition is as follows: Figure 3 As shown. After passing through the adjustable phase difference layer 15 and the quarter-wave plate 13, the polarization state of natural light A' emitted by the light-emitting device 12 remains unchanged. Finally, after passing through the polarizer 14, the polarization state changes, becoming transverse linearly polarized light A1'. Transverse linearly polarized light A1' is reflected by the object to be identified to form reflected light B', which is also transverse linearly polarized light. After passing through the polarizer 14, the polarization state of reflected light B' remains unchanged. Then, after passing through the quarter-wave plate 13, the polarization state changes, becoming clockwise circularly polarized reflected light B1'. This clockwise circularly polarized reflected light B1' then becomes transverse linearly polarized light B' again after passing through the adjustable phase difference layer 15. The transverse linear polarized light B' is reflected by the light-emitting device 12 to form reflected light C', and the reflected light C' is transverse linear polarized light. After the reflected light C' passes through the adjustable phase difference layer 15, the polarization state changes and becomes clockwise circularly polarized light C1'. After the clockwise circularly polarized light C1' passes through the quarter-wave plate 13, the polarization state continues to change and becomes transverse linear polarized light C'. The transverse linear polarized light C' can pass through the polarizer 14 and then be irradiated onto the object to be identified again, and then be reflected by it, that is, the reflected light C' is used to participate in the identification process, instead of the above-mentioned reflected light C not being able to participate in the identification process. Therefore, the brightness requirement for the first light-emitting device 121 is reduced.

[0041] The adjustable phase difference layer is not limited to being provided on one light-emitting device, but may also be provided on multiple light-emitting devices. The specific solution is as follows.

[0042] For example, Figure 4 As shown, on the three light-emitting devices 12 included in the display panel 10, an adjustable phase difference layer 15 is provided between the first light-emitting device 121 and the polarizer 14 and between the second light-emitting device 122 and the polarizer 14, respectively, so as to improve the utilization of the reflected light of the first light-emitting device 121 and the second light-emitting device 122 during the recognition process, thereby reducing the brightness requirements of the first light-emitting device 121 and the second light-emitting device 122 for fingerprint recognition.

[0043] It should be understood that the solution of respectively setting an adjustable phase difference layer on the two light-emitting devices is not limited to the above-mentioned example solution. The adjustable phase difference layer can also be respectively set between the first light-emitting device and the polarizer and between the third light-emitting device and the polarizer, or respectively set between the second light-emitting device and the polarizer and between the third light-emitting device and the polarizer. These can be selected and designed according to the type of light-emitting device and the requirements of the display panel, and will not be elaborated here.

[0044] In addition, an adjustable phase difference layer can be provided between all the light emitting devices and the polarizer, for example, Figure 5 As shown, the display panel 10 includes three light-emitting devices 12, namely a first light-emitting device 121, a second light-emitting device 122 and a third light-emitting device 123. An adjustable phase difference layer 15 is provided on the three light-emitting devices 12, which reduces the brightness requirement of the fingerprint recognition function for all light-emitting devices 12, thereby improving the lifespan of the three light-emitting devices 12.

[0045] It should be understood that the colors of light emitted by the three light-emitting devices can be the same or different. For example, the first light-emitting device can be a red light-emitting device, the second light-emitting device can be a green light-emitting device, and the third light-emitting device can be a blue light-emitting device; or the first light-emitting device can be a red light-emitting device, the second light-emitting device can be a green light-emitting device, and the third light-emitting device can be a red light-emitting device; or the light emitted by all light-emitting devices is green. Furthermore, the number and array arrangement of light-emitting devices in the display panel are not limited to the aforementioned linear arrangement of three light-emitting devices. Other arrangements, such as a nonlinear arrangement of four sub-pixels, can also be used. These can be designed based on the functional requirements of the display panel and will not be detailed here.

[0046] Regarding the specific design of the adjustable phase difference layer in the display panel, in some embodiments, such as Figure 1 and Figure 5As shown, the adjustable phase difference layer 15 is disposed on the surface of the light emitting device 12 on the side facing away from the substrate 11. The location of the adjustable phase difference layer 15 not only improves the reuse rate of the reflected light from the display panel 10, but also eliminates the need to modify the processing technology of other structures included in the display panel 10, thereby saving production costs.

[0047] In other embodiments, the adjustable phase difference layer is disposed on the surface of the polarizer facing the substrate. The adjustable phase difference layer and the polarizer are disposed together, and the adjustable phase difference layer can be selectively disposed for a certain light-emitting device, thereby increasing its application flexibility.

[0048] In other embodiments, a plurality of adjustable phase difference layers are provided, at least some of the adjustable phase difference layers are provided on the surface of the polarizer facing the substrate, and the remaining adjustable phase difference layers are provided on the surface of the light-emitting device facing away from the substrate.

[0049] For example, Figure 4 As shown, among the three light-emitting devices 12 included in the display panel 10, an adjustable phase difference layer 15 is disposed between the first light-emitting device 121 and the second light-emitting device 122 and the polarizer 14. The adjustable phase difference layer 15 between the first light-emitting device 121 and the polarizer 14 is disposed on the surface of the first light-emitting device 121 facing away from the substrate 11. The adjustable phase difference layer 15 between the second light-emitting device 122 and the polarizer 14 is disposed on the surface of the polarizer 14 facing the substrate 11.

[0050] It should be understood that the arrangement of the adjustable retardation layer relative to other film layers in the thickness direction of the display panel is not limited to the exemplary arrangement described above. Depending on the specific film layers included in the display panel, disposing the adjustable retardation layer between the polarizer and the light-emitting device of the display panel can achieve the effect of reusing the reflected light from the light-emitting device. Furthermore, within the same display panel, the adjustable retardation layer can be positioned uniformly or differently in the thickness direction of the display panel, for example, all positioned on the side of the polarizer facing the substrate. These options can be selected based on the functional requirements of the display panel and the actual production process, and are not further elaborated here.

[0051] In some embodiments, the orthographic projection of the adjustable phase difference layer on the substrate overlaps with the orthographic projection of the light-emitting layer of the light-emitting device on the substrate, or falls within the orthographic projection of the first light-emitting layer on the substrate. The adjustable phase difference layer can maximize contact with reflected light from the light-emitting device, thereby more efficiently improving the utilization of reflected light and further effectively extending the life of the light-emitting device.

[0052] For example, Figure 6As shown, the display panel 10 includes three light-emitting devices 12, each of which includes an anode, a light-emitting layer, and a cathode 124 stacked in sequence on a substrate 11, wherein the cathode 124 is a common electrode. Specifically, the first light-emitting device 121 includes a first anode 1212, a cathode 124, and a first light-emitting layer 1211 located between the first anode 1212 and the cathode 124. The second light-emitting device 122 includes a second anode 1222, a cathode 124, and a second light-emitting layer 1221 located between the second anode 1222 and the cathode 124. The third light-emitting device 123 includes a third anode 1232, a cathode 124, and a third light-emitting layer 1231 located between the third anode 1232 and the cathode 124. An adjustable phase difference layer 15 is provided between each light-emitting device 12 and the polarizer 14. Specifically, a first adjustable phase difference layer 15a is provided between the first light-emitting device 121 and the quarter-wave plate 13, a second adjustable phase difference layer 15b is provided between the second light-emitting device 122 and the quarter-wave plate 13, and a second adjustable phase difference layer 15c is provided between the third light-emitting device 123 and the polarizer 14. Furthermore, the orthographic projection of the first adjustable phase difference layer 15a on the substrate 11 coincides with the orthographic projection of the first light-emitting layer 1211 on the substrate 11; the orthographic projection of the second adjustable phase difference layer 15b on the substrate 11 falls within the orthographic projection of the second light-emitting layer 1221 on the substrate 11; and the orthographic projection of the third adjustable phase difference layer 15c on the substrate 11 falls within the orthographic projection of the third light-emitting layer 1231 on the substrate 11.

[0053] It should be understood that the size of the adjustable phase shift layer relative to the surface area of ​​other film layers is not limited to the exemplary embodiment described above. Taking into account actual production processes, the orthographic projection of the adjustable phase shift layer on the substrate can also coincide with the orthographic projection of the pixel opening where the corresponding light-emitting device is located, or fall within the orthographic projection of the pixel opening on the substrate. Furthermore, considering the functional requirements of the display panel, the adjustable phase shift layer can be tiled to cover a functional area, meaning that the same adjustable phase shift layer covers multiple light-emitting devices. These can be configured based on the specific production requirements of the display panel and will not be elaborated here.

[0054] In other embodiments, the adjustable phase shift layer has at least one opening, the orthographic projection of which on the substrate falls within the orthographic projection of the light-emitting layer of the light-emitting device on the substrate. This arrangement of the adjustable phase shift layer enables the display panel to selectively reuse reflected light from a certain area or a portion of the light-emitting device. Furthermore, the opening ensures that the adjustable phase shift layer does not substantially affect the display quality of the display panel.

[0055] For example, Figure 6As shown, in the display panel 10, the second adjustable phase difference layer 15b, disposed on the side of the cathode 124 corresponding to the second light-emitting device 122 facing away from the substrate 11, and the third adjustable phase difference layer 15c, disposed on the side of the polarizer 14 corresponding to the third light-emitting device 123 facing the third light-emitting device 123, each have an opening, namely a first opening 151 and a second opening 152. The orthographic projection of the first opening 151 and the corresponding second adjustable phase difference layer 15b on the substrate 11 falls within the orthographic projection of the second light-emitting layer 1221 of the second light-emitting device 122 on the substrate 11. The orthographic projection of the second opening 152 and the corresponding third adjustable phase difference layer 15c on the substrate 11 falls within the orthographic projection of the third light-emitting layer 1231 of the third light-emitting device 123 on the substrate 11. The second adjustable phase difference layer 15b and the third adjustable phase difference layer 15c are disposed around the edges of the light-emitting regions corresponding to the second light-emitting device 122 and the third light-emitting device 123, respectively.

[0056] It should be understood that no matter where the adjustable phase difference layer is set between the light-emitting device and the polarizer, it can be provided with an opening or not, and the specific number, shape, and size of the openings are not limited to the one located in the center position in the above example. These can be designed according to the specific requirements of the display panel and will not be elaborated here.

[0057] In some embodiments, a display panel includes a first light-emitting device emitting light of a first color, a second light-emitting device emitting light of a second color, and a third light-emitting device emitting light of a third color. The wavelength of the first color light is greater than that of the second color light, and the wavelength of the second color light is greater than that of the third color light. An adjustable phase difference layer is disposed between the second light-emitting devices and a polarizer. The second light-emitting device, which is located at an intermediate wavelength and has the highest luminance, is provided with an adjustable phase difference layer. This can substantially not affect the display quality of the display panel while more effectively improving the utilization of reflected light, thereby more effectively extending the lifespan of the light-emitting devices.

[0058] For example, Figure 7 As shown, the display panel 10 includes three light-emitting devices 12, namely a first light-emitting device 121 emitting red light, a second light-emitting device 122 emitting green light, and a third light-emitting device 123 emitting blue light. The wavelength of red light is greater than that of green light, and the wavelength of green light is greater than half the wavelength of blue light. In addition, an adjustable phase difference layer 15 is provided between the second light-emitting device 122 having an intermediate wavelength and the polarizer 14, thereby improving the utilization rate of green light. Since green light has the highest brightness, the light utilization rate is more effectively improved.

[0059] It should be understood that the first light emitting device and the polarizer and the second light emitting device and the polarizer can also be designed with an adjustable phase difference layer according to the requirements of the display panel. For details, please refer to Figure 4 and Figure 5 However, it is not limited to the setting scheme. The specific design scheme can be designed according to the functional requirements of the display panel, which will not be described here.

[0060] In some embodiments, the adjustable phase difference layer includes a first electrode, a second electrode, and a phase difference conversion layer. The phase difference conversion layer is located between the first electrode and the second electrode, and the phase difference conversion layer can be switched between the optical lens and the phase difference film under the action of the electric field, and in the phase difference film state, the phase difference of the phase difference conversion layer is (1 / 4+n) times the wavelength of the light emitted by the corresponding light-emitting device, where n is an integer and n≥0. In at least one embodiment, the first electrode, the second electrode, and the phase difference conversion layer are in the same layer, which reduces the effect of setting the adjustable phase difference layer on the thinness of the display panel. By controlling the intensity of the electric field formed between the first electrode and the second electrode, it is possible to control the switching of the phase difference conversion layer between different functional modes. This method is simple and easy to implement.

[0061] For example, Figure 7 As shown, the adjustable phase difference layer 15 provided on the surface of the second light-emitting device 122 emitting green light away from the substrate 11 includes a first electrode 152, a second electrode 153 and a phase difference conversion layer 154. The first electrode 152 and the second electrode 153 are provided in the same layer as the phase difference conversion layer 154 and are respectively provided on both sides of the phase difference conversion layer 154. The phase difference of the phase difference conversion layer is (1 / 4 + n) times the wavelength of the green light emitted by the second light-emitting device 122, where n is an integer and n ≥ 0.

[0062] It should be understood that the arrangement of the first electrode and the second electrode is not limited to the above-mentioned exemplary scheme. They can also be arranged in the gap around the light-emitting device or at other positions. In addition, the first electrode, the second electrode and the phase difference conversion layer can also be arranged in different layers, and a stacking scheme can be adopted. These can be specifically designed according to the specific structure and wiring design of the display panel, and will not be elaborated here.

[0063] In at least one embodiment, the material of the adjustable retardation layer is lithium niobate crystal. This utilizes the property that ions in the lithium niobate crystal will shift in response to changes in external conditions, enabling the adjustable retardation layer to switch between an optical lens and a retardation film under the action of an external electric field. This eliminates the need for research and development of materials for the adjustable retardation layer, thus saving production costs.

[0064] It should be understood that the materials and conditions for realizing the switchability of the adjustable phase difference layer between the optical lens and the phase difference film under the action of an external electric field are not limited to the lithium niobate crystal and external electric field in the above examples. Other methods such as liquid crystal materials and piezoelectric conditions, or new materials obtained by doping or compounding materials based on lithium niobate crystals can also be used.

[0065] In some embodiments, as Figure 7 As shown, the display panel 10 further includes a fingerprint sensor 16a, which is disposed on a side of the substrate 11 away from the light emitting device 12. In at least one embodiment, the substrate 11 is a transparent substrate 11, thereby improving the recognition accuracy of the fingerprint recognition sensor.

[0066] In some embodiments, as Figure 8 As shown, the display panel 10 further includes a fingerprint sensor 16b, which is disposed on the substrate 11 on the same side as the light emitting device 12 and located around the light emitting device 12. The fingerprint sensor 16b design is integrated with the structure of the display panel 10, which helps to make the display panel 10 thinner and lighter.

[0067] In some embodiments, as Figure 9 As shown, the display panel 10 includes a display area AA and a non-display area NA. The display area AA includes a first area 17 and a second area 18. The second area 18 includes multiple pixel areas 181. An adjustable phase difference layer 15 is provided in at least one pixel area 181. Based on the functional requirements of the display panel 10, an adjustable phase difference layer is provided in certain areas, such as the pixel area 181 in the fingerprint recognition area. This not only does not affect the display effect of the display panel 10, but also improves the lifespan of the light-emitting devices in certain areas of the display panel 10, such as the pixel area 181 in the fingerprint recognition area, thereby improving the overall performance of the display panel 10.

[0068] An embodiment of the present application further provides a display device, which includes the display panel of any one of the above embodiments.

[0069] In at least one embodiment, the display device further includes a touch sensor, a touch chip, and a flexible circuit board for implementing touch control. To achieve a thinner and lighter touch display panel, the touch sensor is disposed in the encapsulation layer of the display panel, the touch chip is disposed on the flexible circuit board, and signals are transmitted to the touch sensor via touch signal lines.

[0070] In at least one embodiment, the display device can be any product or component with display and touch functions, such as a mobile phone, a tablet computer, a television, a monitor, a laptop computer, a digital photo frame, a navigator, or the like.

[0071] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A display panel, characterized in that: include: substrate; at least one light-emitting device, disposed on the substrate; a quarter-wave plate, disposed on a side of the light-emitting device facing away from the substrate; a polarizer, disposed on a side of the quarter-wave plate facing away from the substrate; At least one adjustable phase difference layer is disposed between the polarizer and the light-emitting device, the adjustable phase difference layer comprising a first electrode, a second electrode, and a phase difference conversion layer located between the first electrode and the second electrode, the phase difference conversion layer being switchable between an optical lens state and a phase difference film state under the action of an electric field; In which, in the optical lens state, the adjustable phase difference layer maintains the polarization state of the transmitted light passing through it, and in the phase difference film state, the phase difference of the phase difference conversion layer is (1 / 4+n) times the wavelength of the light emitted by the corresponding light-emitting device, where n is an integer and n≥0, so that the polarized light passing through it can be switched between circularly polarized light and linearly polarized light.

2. The display panel according to claim 1, wherein: The orthographic projection of the adjustable phase difference layer on the substrate coincides with the orthographic projection of the light-emitting layer of the light-emitting device on the substrate.

3. The display panel according to claim 1, wherein The adjustable phase difference layer has at least one opening, and the orthographic projection of the opening on the substrate falls within the orthographic projection of the light-emitting layer of the light-emitting device on the substrate.

4. The display panel according to claim 1, wherein: The display panel includes a first light-emitting device that emits a first color light, a second light-emitting device that emits a second color light, and a third light-emitting device that emits a third color light, and the wavelength of the first color light is greater than the wavelength of the second color light, the wavelength of the second color light is greater than the wavelength of the third color light, and the adjustable phase difference layer is provided between the second light-emitting device and the polarizer.

5. The display panel according to claim 4, wherein: The adjustable phase difference layer is provided between the first light emitting device and the polarizer, and / or the adjustable phase difference layer is provided between the third light emitting device and the polarizer.

6. The display panel according to any one of claims 1 to 5, characterized in that: The first electrode, the second electrode and the phase difference conversion layer are in the same layer.

7. The display panel according to claim 6, wherein: The material of the adjustable phase difference layer is lithium niobate crystal.

8. The display panel according to claim 1, wherein: Also includes: The fingerprint sensor is arranged on a side of the substrate away from the light-emitting device, or is arranged on the same side of the substrate as the light-emitting device and located around the light-emitting device.

9. The display panel according to claim 8, wherein: In a case where the fingerprint sensor is disposed on a side of the substrate facing away from the light-emitting device, the substrate is a transparent substrate.

10. The display panel according to claim 1, wherein It comprises a display area and a non-display area, wherein the display area comprises a first area and a second area, the second area comprises a plurality of pixel areas, and the adjustable phase difference layer is provided in at least one of the pixel areas.

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

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