Display panel and display device

Abstract

The invention discloses a display panel and a display device, and belongs to the technical field of display. The display panel comprises a driving backboard, a plurality of light emitting devices, a plurality of light conversion parts and a plurality of light filtering units. The light conversion part converts at least part of other wave band light in the white light emitted by the corresponding light-emitting device into specified wave band light, and the color of the specified wave band light is the same as that of the light filtering unit corresponding to the light conversion part. Only the light of the specified wave band can penetrate through the light filtering unit corresponding to the light-emitting device, and the light of other wave bands can be absorbed by the corresponding light filtering unit. Therefore, through the light conversion part corresponding to the light-emitting device, at least part of unutilized light rays of other wavebands in the light rays emitted by the light-emitting device is converted into the light rays of the specified wavebands capable of penetrating through the light filtering unit, so that the light-emitting efficiency of the display panel is improved, the brightness of pixels of different colors is improved, and the brightness of the display panel is further improved.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display panel and a display device. Background Art

[0002] Organic Light Emitting Diode (OLED) display panels are regarded as the next-generation display devices due to their advantages such as self-luminescence, high efficiency, vivid colors, thinness, light weight, power saving, and rollability, and have attracted increasing attention in recent years.

[0003] However, the current light extraction efficiency of OLED display screens is relatively low. To increase the brightness, only the current can be increased, resulting in high power consumption and low lifespan of the display device. Summary of the Invention

[0004] Embodiments of this application provide a display panel and a display device, which can solve the problem of relatively low light extraction efficiency of existing OLED display panels. The technical solutions are as follows:

[0005] On the one hand, a display panel is provided, including: a driving backplane, a plurality of light-emitting devices, a plurality of light conversion parts, and a plurality of color filter units;

[0006] The plurality of light-emitting devices are all distributed on one side of the driving backplane and electrically connected to the driving backplane, and the plurality of light-emitting devices are all used for emitting white light;

[0007] The plurality of light conversion parts correspond to at least some of the light-emitting devices, and the light conversion part is located on the light-emitting side of the corresponding light-emitting device;

[0008] The plurality of color filter units correspond to at least some of the light conversion parts, and the color filter unit is located on the side of the corresponding light conversion part away from the light-emitting device;

[0009] Wherein, the light conversion part is used to convert at least some of the light of other wavelength bands in the white light emitted by the corresponding light-emitting device into light of a specified wavelength band, and the color of the light of the specified wavelength band is the same as the color of the color filter unit corresponding to the light conversion part.

[0010] Optionally, the display panel has: a plurality of first sub-pixel regions, a plurality of second sub-pixel regions, and a plurality of third sub-pixel regions; the wavelength of the light emitted by the second sub-pixel region is less than the wavelength of the light emitted by the first sub-pixel region and greater than the wavelength of the light emitted by the third sub-pixel region;

[0011] The light conversion part located in the first sub-pixel region is the first light conversion part, the light conversion part located in the second sub-pixel region is the second light conversion part, and the light conversion part located in the third sub-pixel region is the third light conversion part;

[0012] Wherein, the type of the second light conversion part is the same as that of the first light conversion part, or the type of the second light conversion part is the same as that of the third light conversion part.

[0013] Optionally, in the first sub-pixel region, the wavelength of the specified band light in the white light emitted by the light-emitting device is greater than that of the other band lights; the first light conversion part is used to convert the other band lights with shorter wavelengths into the specified band lights with longer wavelengths;

[0014] In the third sub-pixel region, the wavelength of the specified band light in the white light emitted by the light-emitting device is less than that of the other band lights; the third light conversion part is used to convert the other band lights with longer wavelengths into the specified band lights with shorter wavelengths.

[0015] Optionally, the band range of the other band lights converted by the second light conversion part is within the band range of the first band lights converted by the other light conversion parts;

[0016] Or, the band range of the other band lights converted by the second light conversion part is within the band range of the other band lights converted by the third light conversion part.

[0017] Optionally, the thickness of the first light conversion part is greater than that of the second light conversion part, and the thickness of the second light conversion part is greater than that of the third light conversion part.

[0018] Optionally, the display panel further has a plurality of fourth sub-pixel regions;

[0019] Wherein, the orthographic projection of the filter unit on the driving backplane does not overlap with the orthographic projection of the fourth sub-pixel region on the driving backplane.

[0020] Optionally, the display panel further includes: a plurality of auxiliary light conversion parts, the plurality of auxiliary light conversion parts correspond to the plurality of fourth sub-pixel regions, and the auxiliary light conversion parts are located in the corresponding fourth sub-pixel regions;

[0021] Wherein, the auxiliary light conversion part is used to convert the first band light in the white light emitted by the corresponding light-emitting device into the second band light.

[0022] Optionally, the thickness of the auxiliary light conversion part is less than that of the second light conversion part and greater than that of the third light conversion part.

[0023] Optionally, the light-emitting device includes a first electrode, an organic light-emitting layer, and a second electrode which are stacked. The first electrode is closer to the driving backplane than the second electrode and is electrically connected to the driving backplane.

[0024] Wherein, the light conversion part is located on a side of the second electrode facing away from the first electrode, or the light conversion part is located on a side of the first electrode facing away from the second electrode.

[0025] Optionally, the light-emitting device located in the first sub-pixel region is a first light-emitting device, the light-emitting device located in the second sub-pixel region is a second light-emitting device, and the light-emitting device located in the third sub-pixel region is a third light-emitting device.

[0026] Wherein, the thicknesses of the first electrodes of the first light-emitting device, the second light-emitting device, and the third light-emitting device are different.

[0027] Optionally, the first electrode includes a reflective electrode and a transparent electrode which are stacked, and the reflective electrode is closer to the driving backplane than the transparent electrode.

[0028] Wherein, the thicknesses of the reflective electrodes of the first light-emitting device, the second light-emitting device, and the third light-emitting device are the same; the thicknesses of the transparent electrodes of the first light-emitting device, the second light-emitting device, and the third light-emitting device are different.

[0029] Optionally, the first light conversion part, the second light conversion part, and the third light conversion part are all made of an organic material doped with a light conversion material.

[0030] Optionally, the light conversion material doped in the first light conversion part is the same as the light-emitting material for emitting red light in the organic light-emitting layer.

[0031] The light conversion material doped in the third light conversion part includes a fluorescent material.

[0032] Optionally, the light conversion material doped in the second light conversion part is the same as the light-emitting material for emitting green light in the organic light-emitting layer; or the light conversion material doped in the second light conversion part includes a fluorescent material.

[0033] On the other hand, a display device is provided, including a display panel and a driving chip. The display panel is the display panel described in any one of the above, and the driving chip is configured to apply a driving signal to the display panel.

[0034] The beneficial effects brought by the technical solutions provided in the embodiments of the present application at least include:

[0035] In the display panel provided by the embodiment of the present application, the light conversion unit is used to convert at least part of the light of other wavelength bands in the white light emitted by the corresponding light-emitting device into light of a specified wavelength band, and the color of the light of the specified wavelength band is the same as the color of the color filter unit corresponding to the light conversion unit. The light of other wavelength bands is the light in the white light emitted by the light-emitting device except for the specified wavelength band. Since only the light of the specified wavelength band can pass through the color filter unit corresponding to the light-emitting device, while the light of other wavelength bands will be absorbed by the corresponding color filter unit. Therefore, through the light conversion unit corresponding to the light-emitting device, at least part of the light of other wavelength bands that is not utilized in the light emitted by the light-emitting device is converted into the light of the specified wavelength band that can pass through the color filter unit, thereby improving the light extraction efficiency of the display panel. Furthermore, the brightness of pixels of different colors can be increased without increasing the current, that is, the brightness of the display panel is increased, so that the power consumption of the display panel can be reduced and the service life of the display panel can be extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0037] Figure 1 is a schematic diagram of the film layer structure of a display panel provided by an embodiment of the present application;

[0038] Figure 2 is a schematic diagram of the film layer structure of another display panel provided by an embodiment of the present application;

[0039] Figure 3 is a schematic diagram of the film layer structure of a light-emitting device provided by an embodiment of the present application;

[0040] Figure 4 is a schematic diagram of the film layer structure of yet another display panel provided by an embodiment of the present application;

[0041] Figure 5 is a schematic diagram of the film layer structure of still another display panel provided by an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] To make the objectives, technical solutions, and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the drawings.

[0043] Please refer to Figure 1 , Figure 1It is a schematic diagram of the film layer structure of a display panel provided by an embodiment of the present application. The display panel 000 includes: a driving backplane 100, a plurality of light-emitting devices 200, a plurality of light conversion parts 300, and a plurality of light filtering units 400.

[0044] The plurality of light-emitting devices 200 in the display panel 000 are all distributed on one side of the driving backplane 100 and are electrically connected to the driving backplane 100. The plurality of light-emitting devices 200 are all used for emitting white light. The driving backplane 100 includes a plurality of pixel driving circuits. Each pixel driving circuit may include at least two transistors. Each pixel driving circuit corresponds to a light-emitting device 200, and the light-emitting device 200 may be electrically connected to the transistors in the corresponding pixel driving circuit, so that the driving backplane 100 can drive the plurality of light-emitting devices 200 to emit light, enabling the display panel 000 to display corresponding images.

[0045] The plurality of light conversion parts 300 in the display panel 000 correspond to at least some of the light-emitting devices 200, and the light conversion part 200 is located on the light-emitting side of the corresponding light-emitting device 300.

[0046] The plurality of light filtering units 400 in the display panel 000 correspond to at least some of the light conversion parts 300, and the light filtering unit 400 is located on the side of the corresponding light conversion part 300 away from the light-emitting device 200. The light filtering unit 400 has light filtering properties. The light filtering unit 400 is not completely transparent, and only light of a specific color can pass through the light filtering unit 400. Here, the light filtering unit 400 may include a red light filtering unit, a green light filtering unit, and a blue light filtering unit. Correspondingly, only red light can pass through the red light filtering unit, only green light can pass through the green light filtering unit, and only blue light can pass through the blue light filtering unit.

[0047] Among them, the light conversion part 300 is used to convert at least some of the other band light in the white light emitted by the corresponding light-emitting device 200 into specified band light, and the color of the specified band light is the same as the color of the light filtering unit 400 corresponding to the light conversion part 300. The other band light is the light in the white light emitted by the light-emitting device 200 except for the specified band.

[0048] In this case, since only the light rays of the specified wavelength band can pass through the light filtering unit 400 corresponding to the light emitting device 200, while the light rays of other wavelength bands will be absorbed by the corresponding light filtering unit 400. Therefore, through the light conversion unit 300 corresponding to the light emitting device 200, at least part of the light rays of other wavelength bands that are not utilized in the light rays emitted by the light emitting device 200 are converted into light rays of the specified wavelength band that can pass through the light filtering unit 400, thereby improving the light extraction efficiency of the display panel 000. Furthermore, the brightness of pixels of different colors can be increased without increasing the current, that is, the brightness of the display panel 000 is increased, so that the power consumption of the display panel 000 can be reduced and the service life of the display panel 000 can be extended.

[0049] Exemplarily, the light filtering unit 400 corresponding to a certain light emitting device 200 is a red light filtering unit 410. At least part of the blue light rays and green light rays emitted by the light emitting device 200 can be converted into red light rays through the corresponding light conversion unit 300, so that the converted red light rays can pass through the red light filtering unit 410. Furthermore, the brightness of the red pixels can be increased without increasing the current, and then the brightness of the display panel 000 can be increased, and the light extraction efficiency of the display panel 000 can be improved, so that the power consumption of the display panel 000 can be reduced and the service life of the display panel 000 can be extended.

[0050] In summary, for the display panel provided in the embodiment of the present application, the light conversion unit is used to convert at least part of the light rays of other wavelength bands in the white light rays emitted by the corresponding light emitting device into light rays of the specified wavelength band, and the color of the light rays of the specified wavelength band is the same as the color of the light filtering unit corresponding to the light conversion unit. The light rays of other wavelength bands are the light rays in the white light rays emitted by the light emitting device except for the specified wavelength band. Since only the light rays of the specified wavelength band can pass through the light filtering unit corresponding to the light emitting device, while the light rays of other wavelength bands will be absorbed by the corresponding light filtering unit. Therefore, through the light conversion unit corresponding to the light emitting device, at least part of the light rays of other wavelength bands that are not utilized in the light rays emitted by the light emitting device are converted into light rays of the specified wavelength band that can pass through the light filtering unit, thereby improving the light extraction efficiency of the display panel, and further increasing the brightness of pixels of different colors without increasing the current, that is, increasing the brightness of the display panel, so that the power consumption of the display panel can be reduced and the service life of the display panel can be extended.

[0051] In the embodiment of the present application, please refer to Figure 2 and Figure 3 , Figure 2 which is a schematic diagram of the film layer structure of another display panel provided in the embodiment of the present application. Figure 3It is a schematic diagram of the film layer structure of a light-emitting device provided by an embodiment of the present application. The light-emitting device 200 in the display panel may include: a first electrode 210, an organic light-emitting layer 220, and a second electrode 230 that are stacked. The first electrode 210 is closer to the driving backplane 100 than the second electrode 230, and the first electrode 210 is electrically connected to the driving backplane 100. Among them, the organic light-emitting layer 220 includes a plurality of sub-light-emitting layers that are stacked. Each sub-light-emitting layer includes: a hole injection layer HIL, a hole transport layer HTL, a light-emitting material layer EML, an electron transport layer ETL, and an electron injection layer EIL that are stacked on the side away from the driving backplane 100. And any two adjacent sub-light-emitting layers in the organic light-emitting layer 220 can be connected by a charge generation layer CGL. In this way, each sub-light-emitting layer in the organic light-emitting layer 220 can be connected in series through the charge generation layer CGL.

[0052] Exemplarily, as Figure 3 shown, when the light emitted by the light-emitting device 200 is white light, the organic light-emitting layer 220 includes two sub-light-emitting layers: a first sub-light-emitting layer 221 and a second sub-light-emitting layer 222. Among them, one of the first sub-light-emitting layer 221 and the second sub-light-emitting layer 222 can be a yellow sub-light-emitting layer, and the other can be a blue sub-light-emitting layer. In other alternative embodiments, the organic light-emitting layer 220 may include three sub-light-emitting layers: a red sub-light-emitting layer, a green sub-light-emitting layer, and a blue sub-light-emitting layer. The embodiments of the present application do not limit this.

[0053] In the embodiments of the present application, the display panel 000 may further include: a pixel defining layer 500. The light-emitting device 200 and the pixel defining layer 500 are located on the same side of the driving backplane 100, and the pixel defining layer 500 is located on the side of the first electrode 210 away from the driving backplane 100. Among them, the pixel defining layer 500 in the display panel 000 has a plurality of pixel openings K, and the plurality of pixel openings K correspond to the plurality of light-emitting devices 200 one by one, and at least part of the light-emitting device 200 is located in the corresponding pixel opening K.

[0054] In the embodiments of the present application, the display panel 000 may further include: a packaging layer 600. The packaging layer 600 is located on the side of the plurality of light conversion parts 300 away from the driving backplane 100. The packaging layer 600 can be used to package each light-emitting device 200, so that water and oxygen in the external environment are not easily eroded into the interior of the light-emitting device 200, and the light-emitting device 200 is damaged.

[0055] In an embodiment of the present application, the display panel 000 may further include: a touch layer 700. The touch layer 700 is located on a side of the encapsulation layer 600 away from the driving backplane 100. The touch layer 700 in the display panel 000 may include a first metal touch layer 710, a second metal touch layer 720, and a touch insulating layer 730 located between the first metal touch layer 710 and the second metal touch layer 720.

[0056] Here, one of the first metal touch layer 710 and the second metal touch layer 720 may include: a plurality of first touch electrodes and a plurality of second touch electrodes arranged in the same layer, and a connection electrode for connecting two adjacent first touch electrodes; the other of the first metal touch layer 710 and the second metal touch layer 720 may include: a bridging electrode for connecting two adjacent first touch electrodes.

[0057] It should be noted that the bridging electrode and the connection electrode may be arranged in a cross manner, and the two may be insulated from each other through the touch insulating layer 730. Among them, one of the first touch electrode and the second touch electrode may be a touch driving electrode, and the other may be a touch sensing electrode. Through the cooperation of the touch driving electrode and the touch sensing electrode, the display panel can have a touch function.

[0058] It should also be noted that both the touch driving electrode and the touch sensing electrode are grid-shaped electrodes having a plurality of grid holes. That is, the first touch layer has a plurality of first grid holes, and the plurality of first grid holes correspond to the plurality of light-emitting devices 200 one by one, and the orthographic projection of the light-emitting device 200 on the driving backplane 100 is located within the orthographic projection of the corresponding first grid hole on the driving backplane 100; the second touch layer has a plurality of second grid holes, and the plurality of second grid holes correspond to the plurality of light-emitting devices 200 one by one, and the orthographic projection of the light-emitting device 200 on the driving backplane 100 is located within the orthographic projection of the corresponding second grid hole on the driving backplane 100. And in order to ensure that the touch layer 700 does not block the light emitted by the light-emitting device 200, the touch insulating layer 730 may be made of a light-transmitting material. In this way, the light emitted by the light-emitting device 200 can pass through the corresponding first grid hole, the touch insulating layer 730, and the corresponding second grid hole and then exit, so as to ensure that the light emitted by the light-emitting device 200 is not blocked by the touch layer 700.

[0059] In an embodiment of the present application, the display panel 000 may further include: a light absorption layer 800 located on a side of the touch control layer 700 away from the driving backplane 100. The light absorption layer 800 may be made of a material with light absorption properties. For example, the display layer 800 may be a black matrix layer. The light absorption layer 800 in the display panel 000 has a plurality of light-emitting openings G, and the plurality of light-emitting openings G correspond to the plurality of light-emitting devices 200 in the display panel 000 one by one. The orthographic projection of the light-emitting device 200 on the driving backplane 100 in the display panel 000 is located within the orthographic projection of the corresponding light-emitting opening G on the driving backplane 100. In this way, it can be ensured that the light absorption layer 800 does not block the main light rays emitted by the light-emitting device 200, so as to improve the light-emitting efficiency of the light-emitting device 200. In addition, a plurality of filter units 400 correspond to at least a part of the plurality of light-emitting openings G, and at least a part of the filter unit 400 is located within the corresponding light-emitting opening G.

[0060] In an embodiment of the present application, the display panel 000 may further include: a covering layer 900 located on a side of the filter unit 400 away from the driving backplane 100. The covering layer 900 is used to cover the plurality of filter units 400, thereby protecting the filter units 400 and ensuring the flatness of the light-emitting side of the display panel 000.

[0061] In an embodiment of the present application, as Figure 2 shown, the display panel 000 has: a plurality of first sub-pixel regions 00a, a plurality of second sub-pixel regions 00b, and a plurality of third sub-pixel regions 00c. Here, the wavelength of the light emitted by the second sub-pixel region 00b is less than the wavelength of the light emitted by the first sub-pixel region 00a and greater than the wavelength of the light emitted by the third sub-pixel region 00c. Exemplarily, the light emitted by the first sub-pixel region 00a is red light, the light emitted by the second sub-pixel region 00b is green light, and the light emitted by the third sub-pixel region 00c is blue light.

[0062] The light conversion part 300 located in the first sub-pixel region 00a is the first light conversion part 310, the light conversion part 300 located in the second sub-pixel region 00b is the second light conversion part 320, and the light conversion part 300 located in the third sub-pixel region 00c is the third light conversion part 330. Here, the first light conversion part 310, the second light conversion part 320, and the third light conversion part 330 in the display panel 000 can all be made of an organic material doped with a light conversion material. The light conversion material can convert light rays in other wavelength bands in the white light rays emitted by the light-emitting device 200 into light rays in a specified wavelength band.

[0063] In this case, within the first sub-pixel region 00a, the wavelength of the light in the specified wavelength band among the white light emitted by the light-emitting device 200 is greater than the wavelengths of the light in other wavelength bands; the first light conversion unit 310 is configured to convert the light in other wavelength bands with shorter wavelengths into the light in the specified wavelength band with a longer wavelength. Exemplarily, the light emitted from the first sub-pixel region 00a is red light. Among the white light emitted by the light-emitting device 200 within the first sub-pixel region 00a, the light in the specified wavelength band is red light, and the light in other wavelength bands is green light and blue light. The first light conversion unit 310 can convert at least part of the green light and blue light into red light, and then emit it from the red color filter unit 400. Furthermore, the brightness of the red pixel can be increased without increasing the current, thereby increasing the brightness of the display panel 000, improving the light extraction efficiency of the display panel 000, reducing the power consumption of the display panel 000, and increasing the service life of the display panel 000.

[0064] Here, the light conversion material doped in the first light conversion unit 310 can be the same as the light-emitting material used to emit red light in the organic light-emitting layer 220. For example, the light conversion material doped in the first light conversion unit 320 is the light-emitting material layer EML in the red sub-light-emitting layer. The light-emitting material layer EML in the red sub-light-emitting layer includes a photoluminescent material for converting blue-green light into red light.

[0065] Within the third sub-pixel region 00c, the wavelength of the light in the specified wavelength band among the white light emitted by the light-emitting device 200 is less than the wavelengths of the light in other wavelength bands; the third light conversion unit 330 is configured to convert the light in other wavelength bands with longer wavelengths into the light in the specified wavelength band with a shorter wavelength. Exemplarily, the light emitted from the third sub-pixel region 00c is blue light. Among the white light emitted by the light-emitting device 200 within the third sub-pixel region 00c, the light in the specified wavelength band is blue light, and the light in other wavelength bands is red light and green light. The third light conversion unit 330 can convert at least part of the red light and green light into blue light, and then emit it from the blue color filter unit 400. Furthermore, the brightness of the blue pixel can be increased without increasing the current, thereby increasing the brightness of the display panel 000, improving the light extraction efficiency of the display panel 000, reducing the power consumption of the display panel 000, and increasing the service life of the display panel 000. Here, the light conversion material doped in the third light conversion unit 330 includes a fluorescent material that can convert red light or green light into blue light.

[0066] It should be noted that since the wavelength of the light emitted from the second sub-pixel region 00b is less than the wavelength of the light emitted from the first sub-pixel region 00a and greater than the wavelength of the light emitted from the third sub-pixel region 00c. Therefore, the type of the second light conversion unit 320 can be the same as that of the first light conversion unit 310. In this case, the wavelength range of the other band light converted by the second light conversion unit 320 is within the wavelength range of the other band light converted by the first light conversion unit 310. Exemplarily, the light emitted from the second sub-pixel region 00b is green light. Among the white light emitted by the light-emitting device 200 in the second sub-pixel region 00b, the designated band light is green light, and the other band light is blue light. The second light conversion unit 320 can convert at least part of the blue light into green light, and then emit it from the green filter unit 400. Further, the brightness of the green pixel can be increased without increasing the current, thereby increasing the brightness of the display panel 000 and improving the light extraction efficiency of the display panel 000. Thus, the power consumption of the display panel 000 can be reduced, and the service life of the display panel 000 can be increased.

[0067] Here, the light conversion material doped in the second light conversion unit 320 can be the same as the light-emitting material used to emit green light in the organic light-emitting layer 220. For example, the light conversion material doped in the second light conversion unit 320 is the light-emitting material layer EML in the green sub-light-emitting layer. The light-emitting material layer EML in the green sub-light-emitting layer includes a photoluminescent material for converting red light or blue light into green light.

[0068] Alternatively, the type of the second light conversion unit 320 can be the same as that of the third light conversion unit 330. In this case, the wavelength range of the other band light converted by the second light conversion unit 320 is within the wavelength range of the other band light converted by the third light conversion unit 330. Exemplarily, the light emitted from the second sub-pixel region 00b is green light. Among the white light emitted by the light-emitting device 200 in the second sub-pixel region 00b, the designated band light is green light, and the other band light is red light. The second light conversion unit 320 can convert at least part of the red light into green light, and then emit it from the green filter unit 400. Further, the brightness of the green pixel can be increased without increasing the current, thereby increasing the brightness of the display panel 000 and improving the light extraction efficiency of the display panel 000. Thus, the power consumption of the display panel 000 can be reduced, and the service life of the display panel 000 can be increased. Here, the light conversion material doped in the second light conversion unit 320 includes a fluorescent material that can convert red light into green light.

[0069] It should also be noted that in other embodiments, the light conversion materials doped in the first light conversion unit 310, the second light conversion unit 320, and the third light conversion unit 330 may also be quantum dot materials. For example, cadmium-based materials such as cadmium selenide and cadmium sulfide, or cadmium-free materials such as InP (indium phosphide), perovskite, and carbon nanoflakes. The embodiments of the present application do not limit this. Here, the emission spectrum of the quantum dot material can be controlled by changing the size of the quantum dots. Therefore, when selecting the quantum dot materials in the first light conversion unit 320, the second light conversion unit 320, and the third light conversion unit 330, quantum dots of corresponding sizes are selected according to the required color.

[0070] In the embodiments of the present application, as Figure 2 and 3 shown, since the light conversion effect of the light conversion unit 300 is affected by the wavelength of the specified band corresponding to the light conversion unit 300, and the wavelength of the specified band corresponding to the first light conversion unit 310 is greater than the wavelength of the specified band corresponding to the second light conversion unit 320, and the wavelength of the specified band corresponding to the second light conversion unit 320 is greater than the wavelength of the specified band corresponding to the third light conversion unit 310. Therefore, the thickness t1 of the first light conversion unit 310 is greater than the thickness t2 of the second light conversion unit 320, and the thickness t2 of the second light conversion unit 320 is greater than the thickness t3 of the third light conversion unit 310. In this way, the conversion efficiency of the first light conversion unit 310, the second light conversion unit 320, and the third light conversion unit 330 for the corresponding specified band can be effectively increased, the brightness of the display panel 000 can be further improved, the light extraction efficiency of the display panel 000 can be improved, thereby reducing the power consumption of the display panel 000 and increasing the service life of the display panel 000.

[0071] Exemplarily, the range of the thickness t1 of the first light conversion unit 310 is 1150 Å to 1250 Å, the range of the thickness t2 of the second light conversion unit 320 is 900 Å to 1000 Å, and the range of the thickness t3 of the third light conversion unit 330 is 600 Å to 700 Å.

[0072] It should be noted that in other embodiments, the thicknesses of the first light conversion unit 310, the second light conversion unit 320, and the third light conversion unit 330 may also be the same. The embodiments of the present application do not limit this.

[0073] In the embodiments of the present application, please refer to Figure 4 , Figure 4It is a schematic diagram of the film layer structure of another display panel provided by an embodiment of the present application. The display panel 000 may further have a plurality of fourth sub-pixel regions 00d. Among them, the orthographic projection of the light filtering unit 400 on the driving backplane 100 does not overlap with the orthographic projection of the fourth sub-pixel region 00d on the driving backplane 100. Therefore, the light of the light-emitting device 200 in the fourth sub-pixel region 00d directly exits from the corresponding light-emitting opening G, that is, the light emitted from the fourth sub-pixel region 00d is white light.

[0074] It should be noted that, please refer to Figure 5 , Figure 5 It is a schematic diagram of the film layer structure of yet another display panel provided by an embodiment of the present application. When there is a color difference between the white light emitted from the fourth sub-pixel region 00d and the originally set white light, the display panel 000 may further include: a plurality of auxiliary light conversion parts 340, the plurality of auxiliary light conversion parts 400 correspond to the plurality of fourth sub-pixel regions 00d, and the auxiliary light conversion part 340 is located in the corresponding fourth sub-pixel region 00d.

[0075] Among them, the auxiliary light conversion part 340 is used to convert the light in the first wavelength band in the white light emitted by the corresponding light-emitting device 200 into the light in the second wavelength band. In this way, the auxiliary light conversion part 340 can correct the white light emitted by the light-emitting device 200, so that the light emitted by the light-emitting device 200 that is biased towards the color corresponding to the light in the first wavelength band can convert part of the light in the first wavelength band into the light in the second wavelength band through the auxiliary light conversion part 340. Furthermore, there is no color difference between the white light emitted from the fourth sub-pixel region 00d and the originally set white light, improving the color accuracy of the display panel 000. Exemplarily, when the white light emitted from the fourth sub-pixel region 00d is reddish, the auxiliary light conversion part 340 can convert part of the red light into green light or blue light, thereby improving the color accuracy of the display panel 000.

[0076] In addition, the thickness of the auxiliary light conversion part 340 is less than the thickness of the second light conversion part 320 and greater than the thickness of the third light conversion part 330. Exemplarily, the range of the thickness t4 of the auxiliary light conversion part 340 is 800 angstroms to 900 angstroms.

[0077] It should also be noted that the auxiliary light conversion part 340 can also be made of an organic material doped with a light conversion material, and the light conversion material doped in the auxiliary light conversion part 340 can be selected to be the same as any one of the first light conversion part 310, the second light conversion part 320, and the third light conversion part 330 according to the light in the first wavelength band and the light in the second wavelength band. For example, when the auxiliary light conversion part 340 converts part of the red light into blue light, the auxiliary light conversion part 340 can be the same as the light conversion material doped in the third light conversion part 330.

[0078] In the embodiments of the present application, in the above embodiments, the top-emission display panel 000 is taken as an example for illustrative purposes, that is, the light conversion unit 300 is located on the side of the second electrode 230 away from the first electrode 210. In other embodiments, in the bottom-emission display panel, the light conversion unit 300 may be located on the side of the first electrode 210 away from the second electrode 220 to improve the light extraction efficiency of the display panel.

[0079] In the embodiments of the present application, as Figure 2 and 3 shown, the light-emitting device 200 located in the first sub-pixel region 00a is the first light-emitting device 201, the light-emitting device 200 located in the second sub-pixel region 00b is the second light-emitting device 202, and the light-emitting device located in the third sub-pixel region 00c is the third light-emitting device 203.

[0080] Among them, the thicknesses of the first electrodes 210 of the first light-emitting device 201, the second light-emitting device 202, and the third light-emitting device 203 are different.

[0081] In this case, the first electrode 210 includes a reflective electrode 211 and a transparent electrode 212 which are stacked, and the reflective electrode 211 is closer to the driving backplane 100 than the transparent electrode 212. And the thicknesses of the reflective electrodes 211 of the first light-emitting device 201, the second light-emitting device 202, and the third light-emitting device 203 are the same; the thicknesses d1 of the transparent electrodes 212 of the first light-emitting device 201, d2 of the transparent electrodes 212 of the second light-emitting device 202, and d3 of the transparent electrodes 212 of the third light-emitting device 203 are different.

[0082] Here, the second electrode 230 may be a semi-transmissive and semi-reflective electrode, so that the reflective electrode 211 and the corresponding second electrode 230 can form a microcavity structure. Among the light rays emitted by the organic light-emitting layer 220 in the light-emitting device 200 and incident on the second electrode 230, a part of the light rays can be transmitted through the second electrode 230 and then emitted, and another part of the light rays can be reflected by the second electrode 230. The light rays reflected by the second electrode 230, and the light rays emitted by the organic light-emitting layer 220 of the light-emitting device 200 and incident on the first electrode 210, can all be transmitted through the transparent electrode 212 and then incident on the reflective electrode 211, and the reflective electrode 211 can reflect these light rays back to the second electrode 230. In this way, the light rays reflected by the reflective electrode 211, and the light rays emitted by the organic light-emitting layer 220 and incident on the second electrode 230 can produce a coherent enhancement microcavity effect, improving the light extraction efficiency of the light-emitting device 200 and making the display effect of the display panel 000 better.

[0083] In this case, the cavity length of the microcavity structure formed by the reflective electrode 211 and the second electrode 230 in the light-emitting device 200 is: the distance between the reflective electrode 211 and the second electrode 230 in the light-emitting device 200. Since the cavity length of the microcavity structure is affected by the wavelength of the light emitted by the light-emitting device 200, the cavity length of the microcavity structure can be adjusted so that the microcavity structure formed by the reflective electrode 211 and the second electrode 230 can produce a coherent enhancement microcavity effect on the light of a specific wavelength in the white light emitted by the light-emitting device 200.

[0084] It should be noted that the thickness d1 of the transparent electrode 212 of the first light-emitting device 201, the thickness d2 of the transparent electrode 212 of the second light-emitting device 202, and the thickness d3 of the transparent electrode 212 of the third light-emitting device 203 have various possible structures. The embodiments of the present application will be schematically described by taking the following two possible cases as examples:

[0085] In the first possible case, as Figure 3 shown, the thickness d1 of the transparent electrode 212 of the first light-emitting device 201 is greater than the thickness d2 of the transparent electrode 212 of the second light-emitting device 202, and the thickness d2 of the transparent electrode 212 of the second light-emitting device 202 is greater than the thickness d3 of the transparent electrode 212 of the third light-emitting device 203. Exemplarily, the range of the thickness d1 of the transparent electrode 212 of the first light-emitting device 201 is 850 Å to 870 Å; the range of the thickness d2 of the transparent electrode 212 of the second light-emitting device 202 is 260 Å to 280 Å; the range of the thickness d3 of the transparent electrode 212 of the third light-emitting device 203 is 110 Å to 130 Å.

[0086] In this way, the microcavity structure in the first light-emitting device 201 can produce a coherent enhancement microcavity effect on the light within the wavelength range emitted by the first sub-pixel region 00a, improving the light-emitting efficiency of the first light-emitting device 201 in the first sub-pixel region 00a; the microcavity structure in the second light-emitting device 202 can produce a coherent enhancement microcavity effect on the light within the wavelength range emitted by the second sub-pixel region 00b, improving the light-emitting efficiency of the second light-emitting device 202 in the second sub-pixel region 00b; the microcavity structure in the third light-emitting device 203 can produce a coherent enhancement microcavity effect on the light within the wavelength range emitted by the third sub-pixel region 00c, improving the light-emitting efficiency of the third light-emitting device 203 in the third sub-pixel region 00c, resulting in a better display effect of the display panel 000.

[0087] Exemplarily, the light emitted from the first sub-pixel region 00a is red light, the light emitted from the second sub-pixel region 00b is green light, and the light emitted from the third sub-pixel region 00c is blue light; the microcavity structure in the first light-emitting device 201 can produce a coherent-enhanced microcavity effect on the red light, the microcavity structure in the second light-emitting device 202 can produce a coherent-enhanced microcavity effect on the green light, and the microcavity structure in the third light-emitting device 203 can produce a coherent-enhanced microcavity effect on the blue light.

[0088] It should be noted that as Figure 4 and Figure 5 shown, when the display panel 000 further has a plurality of fourth sub-pixel regions 00d, the thickness of the reflective electrode 211 of the light-emitting device 200 corresponding to the fourth sub-pixel region 00d, the reflective electrode 211 of the first light-emitting device 201, the reflective electrode 211 of the second light-emitting device 202, and the reflective electrode 211 of the third light-emitting device 203 are the same; the thickness d4 of the transparent electrode 212 of the light-emitting device 200 corresponding to the fourth sub-pixel region 00d is less than the thickness d2 of the transparent electrode 212 of the second light-emitting device 202 and greater than the thickness d3 of the transparent electrode 212 of the third light-emitting device 203. Exemplarily, the range of the thickness d2 of the transparent electrode 212 of the second light-emitting device 202 is from 260 Å to 280 Å; the range of the thickness d4 of the transparent electrode 212 of the light-emitting device 200 corresponding to the fourth sub-pixel region 00d is from 180 Å to 220 Å; the range of the thickness d3 of the transparent electrode 212 of the third light-emitting device 203 is from 110 Å to 130 Å.

[0089] In a second possible case, the thickness d3 of the transparent electrode 212 of the third light-emitting device 203 can be greater than the thickness d1 of the transparent electrode 212 of the first light-emitting device 201, and the thickness d1 of the transparent electrode 212 of the first light-emitting device 201 can be greater than the thickness d2 of the transparent electrode 212 of the second light-emitting device 202. In this way, the first light-emitting device 201, the second light-emitting device 202, and the third light-emitting device 203 can produce a coherent-enhanced microcavity effect on light of different wavelengths in the white light emitted by the light-emitting device 200.

[0090] In summary, for the display panel provided by the embodiment of the present application, the light conversion unit is configured to convert at least part of the light rays in other wavelength bands in the white light rays emitted by the corresponding light-emitting device into light rays in a specified wavelength band, and the color of the light rays in the specified wavelength band is the same as the color of the filter unit corresponding to the light conversion unit. The light rays in other wavelength bands are the light rays in the white light rays emitted by the light-emitting device except for the specified wavelength band. Since only the light rays in the specified wavelength band can pass through the filter unit corresponding to the light-emitting device, while the light rays in other wavelength bands will be absorbed by the corresponding filter unit. Therefore, through the light conversion unit corresponding to the light-emitting device, at least part of the light rays in other wavelength bands that are not utilized in the light rays emitted by the light-emitting device are converted into light rays in the specified wavelength band that can pass through the filter unit, thereby improving the light extraction efficiency of the display panel, and further increasing the brightness of pixels of different colors without increasing the current, that is, increasing the brightness of the display panel, thus reducing the power consumption of the display panel and increasing the service life of the display panel.

[0091] The embodiment of the present application further provides a display device, which may include: a power supply component and a display panel. The power supply component in the display device may be configured to supply power to the display panel, and the display panel may be the above-mentioned display panel.

[0092] Exemplarily, the display device may be: an electronic paper, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, or any product or component with a display function.

[0093] It should be noted that in the drawings, the sizes of layers and regions may be exaggerated for clarity of illustration. Moreover, it can be understood that when an element or layer is referred to as being "on" another element or layer, it can be directly on the other element, or there may be an intermediate layer. Additionally, it can be understood that when an element or layer is referred to as being "under" another element or layer, it can be directly under the other element, or there may be more than one intermediate layer or element. Further, it can be understood that when a layer or element is referred to as being "between" two layers or two elements, it can be the only layer between the two layers or two elements, or there may be more than one intermediate layer or element. Like reference numerals throughout indicate like elements.

[0094] In the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. The term "a plurality" refers to two or more, unless otherwise clearly defined.

[0095] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A display panel, characterized in that, Including: A driving backplane, a plurality of light-emitting devices, a plurality of light conversion parts, and a plurality of light filtering units; The plurality of light-emitting devices are all distributed on one side of the driving backplane and are electrically connected to the driving backplane, and the plurality of light-emitting devices are all used for emitting white light; The plurality of light conversion parts correspond to at least part of the light-emitting devices, and the light conversion part is located on the light-emitting side of the corresponding light-emitting device; The plurality of light filtering units correspond to at least part of the light conversion parts, and the light filtering unit is located on the side of the corresponding light conversion part away from the light-emitting device; Wherein, the light conversion part is used for converting at least part of the light of other wavelength bands in the white light emitted by the corresponding light-emitting device into light of a specified wavelength band, and the color of the light of the specified wavelength band is the same as the color of the light filtering unit corresponding to the light conversion part.

2. The display panel according to claim 1, wherein The display panel has: a plurality of first sub-pixel regions, a plurality of second sub-pixel regions, and a plurality of third sub-pixel regions; the wavelength of the light emitted by the second sub-pixel region is less than the wavelength of the light emitted by the first sub-pixel region and greater than the wavelength of the light emitted by the third sub-pixel region; The light conversion part located in the first sub-pixel region is the first light conversion part, the light conversion part located in the second sub-pixel region is the second light conversion part, and the light conversion part located in the third sub-pixel region is the third light conversion part; Wherein, the type of the second light conversion part is the same as the type of the first light conversion part, or the type of the second light conversion part is the same as the type of the third light conversion part.

3. The display panel according to claim 2, characterized in that, In the first sub-pixel region, the wavelength of the light of the specified wavelength band in the white light emitted by the light-emitting device is greater than the wavelength of the light of other wavelength bands; the first light conversion part is used for converting the light of other wavelength bands with shorter wavelengths into the light of the specified wavelength band with longer wavelengths; In the third sub-pixel region, the wavelength of the light of the specified wavelength band in the white light emitted by the light-emitting device is less than the wavelength of the light of other wavelength bands; the third light conversion part is used for converting the light of other wavelength bands with longer wavelengths into the light of the specified wavelength band with shorter wavelengths.

4. The display panel according to claim 3, wherein The wavelength band range of the light of other wavelength bands converted by the second light conversion part is located within the wavelength band range of the light of other wavelength bands converted by the first light conversion part; Or, the wavelength band range of the light of other wavelength bands converted by the second light conversion part is located within the wavelength band range of the light of other wavelength bands converted by the third light conversion part.

5. The display panel according to claim 2, characterized in that, The thickness of the first light conversion part is greater than the thickness of the second light conversion part, and the thickness of the second light conversion part is greater than the thickness of the third light conversion part.

6. The display panel according to any one of claims 2 to 5, characterized in that, The display panel further has a plurality of fourth sub-pixel regions; Wherein, the orthographic projection of the light filtering unit on the driving backplane does not overlap with the orthographic projection of the fourth sub-pixel region on the driving backplane.

7. The display panel according to claim 6, characterized in that, The display panel further includes: a plurality of auxiliary light conversion parts, the plurality of auxiliary light conversion parts correspond to the plurality of fourth sub-pixel regions, and the auxiliary light conversion part is located in the corresponding fourth sub-pixel region; Wherein, the auxiliary light conversion part is used for converting the light of the first wavelength band in the white light emitted by the corresponding light-emitting device into the light of the second wavelength band.

8. The display panel according to claim 7, wherein The auxiliary light conversion portion has a thickness smaller than that of the second light conversion portion and larger than that of the third light conversion portion.

9. The display panel according to any one of claims 2-5, 7-8, characterized in that, The light emitting device comprises: a first electrode, an organic light emitting layer and a second electrode which are stacked, wherein the first electrode is closer to the driving backplane than the second electrode and is electrically connected to the driving backplane; The light conversion portion is located on a side of the second electrode away from the first electrode, or the light conversion portion is located on a side of the first electrode away from the second electrode.

10. The display module according to claim 9, wherein The light emitting device located in the first sub-pixel region is a first light emitting device, the light emitting device located in the second sub-pixel region is a second light emitting device, and the light emitting device located in the third sub-pixel region is a third light emitting device; The thickness of the first electrode of the first light emitting device, the thickness of the first electrode of the second light emitting device and the thickness of the first electrode of the third light emitting device are different.

11. The display module according to claim 10, wherein, The first electrode comprises: a reflective electrode and a transparent electrode which are stacked, wherein the reflective electrode is closer to the driving backplane than the transparent electrode; The thickness of the reflective electrode of the first light emitting device, the reflective electrode of the second light emitting device and the reflective electrode of the third light emitting device are the same; the thickness of the transparent electrode of the first light emitting device, the thickness of the transparent electrode of the second light emitting device and the thickness of the transparent electrode of the third light emitting device are different.

12. The display panel according to claim 9, characterized in that, The first light conversion part, the second light conversion part and the third light conversion part are all made of organic materials doped with light conversion materials.

13. The display panel according to claim 12, wherein, The light conversion material doped in the first light conversion part is the same as the light emitting material in the organic light emitting layer for emitting red light; The light conversion material doped in the third light conversion part includes a fluorescent material.

14. The display module according to claim 13, wherein The light conversion material doped in the second light conversion part is the same as the light emitting material in the organic light emitting layer for emitting green light; or, the light conversion material doped in the second light conversion part includes a fluorescent material.

15. A display device, characterized in that, include: A display panel and a driving chip, wherein the display panel is the display panel according to any one of claims 1 to 14, and the driving chip is used to apply a driving signal to the display panel.

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