Display panel and driving method therefor, and display device

Abstract

A display panel and a driving method therefor, and a display device, relating to the technical field of display. The display panel comprises a first display substrate (11), a quantum dot layer (13), and a second display substrate (12) that are sequentially stacked, and the second display substrate (12) is arranged close to a light-emitting side; the first display substrate (11) comprises a first substrate (111) and a plurality of first light-emitting devices (LD1) arranged on the side of the first substrate (111) close to the second display substrate (12); the second display substrate (12) comprises a second substrate (121) and a plurality of second light-emitting devices (LD2) arranged on the side of the second substrate (121) close to the first display substrate (11); the quantum dot layer (13) comprises a plurality of quantum dots (QD). The display panel comprises a plurality of pixel units (PU); the pixel units (PU) respectively comprise a plurality of sub-pixels (PX); each first light-emitting device (LD1) and the corresponding second light-emitting device (LD2) overlap with each other within the range of the corresponding sub-pixel (PX), and the color of light emitted by the first light-emitting device (LD1) is different from the color of light emitted by the second light-emitting device (LD2); the plurality of sub-pixels (PX) located in the same pixel unit (PU) include excitation sub-pixels (PXJ) and first sub-pixels (PX1); the quantum dots (QD) overlap with the excitation sub-pixels (PXJ), and do not overlap with the first sub-pixels (PX1). The crosstalk between the sub-pixels PX is reduced, and the display effect is improved.

Description

Display panel, driving method thereof and display device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present application claims priority to the Chinese patent application No. 2024106276485, filed on May 20, 2024, and entitled "Display panel, driving method thereof and display device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present disclosure relates to the technical field of display, and in particular, to a display panel, a driving method thereof and a display device. BACKGROUND

[0004] Organic Light Emitting Diode (OLED) is an active light-emitting display device, which has the advantages of self-emission, wide viewing angle, high contrast, low power consumption, wide color gamut, thinness, and shapeability.

[0005] SUMMARY

[0006] The present disclosure provides a display panel, comprising a first display substrate, a quantum dot layer and a second display substrate which are sequentially stacked, the second display substrate is arranged close to a light-emitting side;

[0007] The first display substrate comprises a first substrate and a plurality of first light-emitting devices arranged on a side of the first substrate close to the second display substrate, the first light-emitting devices are configured to emit first light;

[0008] The second display substrate comprises a second substrate and a plurality of second light-emitting devices arranged on a side of the second substrate close to the first display substrate, the second light-emitting devices are configured to emit second light;

[0009] The quantum dot layer comprises a plurality of quantum dots, the quantum dots are configured to emit light under excitation of the first light; and

[0010] The display panel comprises a plurality of pixel units, each pixel unit comprises a plurality of sub-pixels, the first light-emitting devices and the second light-emitting devices have overlapping projections on the first substrate within a range of each sub-pixel, the first light and the second light have different colors, a plurality of sub-pixels in a same pixel unit comprise at least one excitation sub-pixel and at least one first sub-pixel, the projection of the quantum dots on the first substrate overlaps with the excitation sub-pixel and does not overlap with the first sub-pixel.

[0011] In some embodiments, the plurality of quantum dots comprises one or more types of quantum dots, different types of quantum dots are capable of emitting different colors of light under excitation of the first light.

[0012] In some embodiments, the plurality of quantum dots comprises a first type of quantum dots, the first type of quantum dots are configured to emit a third light under excitation of the first light and / or the second light, the third light has a wavelength greater than that of the first light and at least part of the second light; and

[0013] The at least one excitation sub-pixel comprises a second sub-pixel, a normal projection of the first type of quantum dots on the first substrate is located within a range of the second sub-pixel.

[0014] In some embodiments, the plurality of quantum dots comprises a second type of quantum dots, the second type of quantum dots are configured to emit a fourth light under excitation of the first light, the fourth light has a wavelength greater than that of the first light, and the fourth light has the same color as the second light; and

[0015] The at least one excitation sub-pixel comprises a third sub-pixel, a normal projection of the second type of quantum dots on the first substrate is located within a range of the third sub-pixel.

[0016] In some embodiments, the plurality of quantum dots comprises a third type of quantum dots, the third type of quantum dots are configured to emit a fifth light under excitation of the first light, the fifth light has a wavelength greater than that of the first light, the fifth light has a different color from the second light, and the fifth light has a wavelength less than or equal to that of the second light; and

[0017] The at least one excitation sub-pixel comprises a fourth sub-pixel, a normal projection of the third type of quantum dots on the first substrate is located within a range of the fourth sub-pixel.

[0018] In some embodiments, the second light has a wavelength greater than that of the first light.

[0019] In some embodiments, the first light is blue light, and the second light comprises at least one of red light, green light, and yellow light.

[0020] In some embodiments, the first light-emitting device comprises a first anode, a first light-emitting layer, and a first cathode which are sequentially stacked, the first anode is disposed close to the first substrate, the first anode is a reflective electrode, and the first cathode is a semi-transparent and semi-reflective electrode.

[0021] In some embodiments, the second light-emitting device comprises a second anode, a second light-emitting layer and a second cathode which are sequentially stacked, the second anode is arranged close to the second substrate, the second anode is a transparent electrode, and the first cathode is a transparent electrode or a semi-transparent and semi-reflective electrode.

[0022] In some embodiments, the first light-emitting device comprises a plurality of first light-emitting layers which are stacked and connected in series with each other, and a charge generation layer is arranged between any two adjacent first light-emitting layers.

[0023] In some embodiments, the second display substrate further comprises:

[0024] A filter layer is arranged between the second light-emitting device and the second substrate, and comprises a plurality of filter patterns located at different sub-pixels, the filter patterns are used for transmitting light of a single color, and a projection of the filter pattern on the first substrate overlaps with the excitation sub-pixel.

[0025] In some embodiments, the first display substrate further comprises:

[0026] A first encapsulation layer is arranged on a side of the first light-emitting device away from the first substrate.

[0027] The second display substrate further comprises:

[0028] A second encapsulation layer is arranged on a side of the second light-emitting device away from the second substrate.

[0029] The first encapsulation layer and the second encapsulation layer both comprise a silicon-based thin film material.

[0030] In some embodiments, the display panel further comprises:

[0031] A filling layer is arranged between the first display substrate and the second display substrate, and is used for filling gaps between adjacent quantum dots, and comprises a solid material and / or a gas material.

[0032] The display device provided by the present disclosure comprises:

[0033] The display panel as described in any one of the embodiments; and

[0034] A driving assembly is connected with the first display substrate and the second display substrate respectively, and is used for driving the first light-emitting device and the second light-emitting device to emit light.

[0035] The driving method provided by the present disclosure is applied to the display panel as described in any one of the embodiments, and the driving method comprises:

[0036] control a first light emitting device located in the first sub-pixel to emit light, so that the first sub-pixel emits the first light;

[0037] control a second light emitting device located in the first sub-pixel to emit light, so that the first sub-pixel emits the second light;

[0038] control the first light emitting device and the second light emitting device located in the first sub-pixel to emit light, so that the first sub-pixel emits mixed light of the first light and the second light; and

[0039] control a first light emitting device located in the excitation sub-pixel to emit light, so that the excitation sub-pixel emits light emitted by the quantum dots under excitation of the first light.

[0040] The above description is only a summary of the technical solutions of the present disclosure. In order to enable the technical means of the present disclosure to be more clearly understood, and to be implemented according to the content of the description, and in order to enable the above and other purposes, features and advantages of the present disclosure to be more apparent and easy to understand, the specific embodiments of the present disclosure are described below.

[0041] Brief Description of Drawings

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the related art, the drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings according to these drawings without creative labor. It should be noted that the proportions in the drawings are only for illustration and do not represent the actual proportions.

[0043] FIG. 1 exemplarily shows a cross-sectional structure schematic diagram of a first display panel;

[0044] FIG. 2 exemplarily shows a cross-sectional structure schematic diagram of a second display panel;

[0045] FIG. 3 exemplarily shows a cross-sectional structure schematic diagram of a third display panel;

[0046] FIG. 4 exemplarily shows a cross-sectional structure schematic diagram of a fourth display panel;

[0047] FIG. 5 exemplarily shows a cross-sectional structure schematic diagram of a first display substrate;

[0048] FIG. 6 exemplarily shows a cross-sectional structure schematic diagram of a second display substrate;

[0049] FIG. 7 exemplarily shows a cross-sectional structure schematic diagram of a fifth display panel.

[0050] Detailed Description

[0051] To make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only some, but not all of the embodiments of the present disclosure. Based on the embodiments in the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present disclosure.

[0052] The present disclosure provides a display panel, as shown in any one of FIGS. 1-4, comprising a first display substrate 11, a quantum dot layer 13 and a second display substrate 12 which are sequentially stacked, and the second display substrate 12 is arranged close to the light-emitting side.

[0053] As shown in any one of FIGS. 1-4, the first display substrate 11 comprises a first substrate 111, and a plurality of first light-emitting devices LD1 arranged on the side of the first substrate 111 close to the second display substrate 12, the first light-emitting devices LD1 are used for emitting first light. The second display substrate 12 comprises a second substrate 121, and a plurality of second light-emitting devices LD2 arranged on the side of the second substrate 121 close to the first display substrate 11, the second light-emitting devices LD2 are used for emitting second light. The quantum dot layer 13 comprises a plurality of quantum dots QD, the quantum dots QD are used for emitting light under the excitation of the first light.

[0054] The display panel comprises a plurality of pixel units PU, and FIGS. 1-4 show the cross-sectional structure of one pixel unit PU. As shown in any one of FIGS. 1-4, the pixel unit PU comprises a plurality of sub-pixels PX, the orthographic projections of the first light-emitting devices LD1 and the second light-emitting devices LD2 on the first substrate 111 overlap in the range of each sub-pixel PX, the colors of the first light and the second light are different, the plurality of sub-pixels PX in the same pixel unit PU comprise at least one excitation sub-pixel PXJ and at least one first sub-pixel PX1, the orthographic projection of the quantum dots QD on the first substrate 111 overlaps with the excitation sub-pixel PXJ and does not overlap with the first sub-pixel PX1.

[0055] As shown in any one of FIGS. 1-4, the excitation sub-pixel PXJ comprises the first light-emitting device LD1, the quantum dot QD and the second light-emitting device LD2 which are sequentially stacked. Exemplarily, in the excitation sub-pixel PXJ, the orthographic projections of the first light-emitting device LD1, the quantum dot QD and the second light-emitting device LD2 on the first substrate 111 at least partially overlap.

[0056] As shown in any one of FIGS. 1-4, the first sub-pixel PX1 includes the first light-emitting device LD1 and the second light-emitting device LD2 which are sequentially stacked. Exemplarily, in the first sub-pixel PX1, the first light-emitting device LD1 and the second light-emitting device LD2 have at least partially overlapped orthographic projections on the first substrate 111, and have no overlapped orthographic projection with the quantum dots QD on the first substrate 111.

[0057] Since the quantum dots QD are only arranged in the excited sub-pixel PXJ, the quantum dots QD are not arranged in the first sub-pixel PX1, that is, the quantum dots QD in the quantum dot layer 13 are not arranged continuously. By arranging the quantum dots QD at intervals, the crosstalk between the sub-pixels PX is reduced, and the display effect is improved.

[0058] In addition, by arranging the first light-emitting device LD1 emitting the first light and the second light-emitting device LD2 emitting the second light in the two display substrates respectively, the driving voltage and power consumption are reduced. Since the first light-emitting device LD1 and the second light-emitting device LD2 can be independently controlled respectively, by adjusting the driving current of the first light-emitting device LD1 and the second light-emitting device LD2 respectively, the adjustment of display brightness and color temperature can be realized, and high color gamut and high brightness are facilitated.

[0059] Exemplarily, the wavelength of the second light is greater than the wavelength of the first light.

[0060] Exemplarily, the first light is blue light, and the second light includes at least one of red light, green light, and yellow light.

[0061] Exemplarily, when the first light is blue light, the light-emitting layer in the first light-emitting device LD1 includes, for example, an electroluminescent material capable of emitting blue light.

[0062] Exemplarily, when the second light is red light, the light-emitting layer in the second light-emitting device LD2 includes, for example, an electroluminescent material capable of emitting red light. When the second light is green light, the light-emitting layer in the second light-emitting device LD2 includes, for example, an electroluminescent material capable of emitting green light.

[0063] Exemplarily, when the second light is yellow light, the light-emitting layer in the second light-emitting device LD2 includes, for example, an electroluminescent material capable of emitting red light and an electroluminescent material capable of emitting green light, and the two electroluminescent materials are simultaneously evaporated to form the light-emitting layer in the second light-emitting device LD2.

[0064] In some embodiments, the plurality of quantum dots QD includes one type or multiple types of quantum dots QD, and different types of quantum dots QD are capable of emitting different colors of light under excitation of the first light.

[0065] Exemplarily, as shown in FIG. 1, the plurality of quantum dots QD includes one type of quantum dots QD, i.e., the first type of quantum dots QD1. As shown in FIG. 2 and FIG. 3, the plurality of quantum dots QD includes two types of quantum dots QD, i.e., the first type of quantum dots QD1 and the second type of quantum dots QD2. As shown in FIG. 4, the plurality of quantum dots QD includes two types of quantum dots QD, i.e., the first type of quantum dots QD1 and the third type of quantum dots QD3.

[0066] In some embodiments, as shown in any one of FIG. 1 to FIG. 4, the plurality of quantum dots QD includes the first type of quantum dots QD1, the first type of quantum dots QD1 is configured to emit a third light under excitation of the first light and / or the second light, the wavelength of the third light is greater than the wavelength of the first light and at least part of the second light. And, the at least one excitation sub-pixel PXJ includes a second sub-pixel PX2, the orthographic projection of the first type of quantum dots QD1 on the first substrate 111 is located within the range of the second sub-pixel PX2.

[0067] Exemplarily, as shown in any one of FIG. 1 to FIG. 3, the first type of quantum dots QD1 is a red quantum dot, the first light is blue light, and the second light is green light, the red quantum dot emits red light under excitation of the first light, i.e., blue light, and emits red light under excitation of the second light, i.e., green light, and the third light is red light.

[0068] Exemplarily, as shown in FIG. 4, the first type of quantum dots QD1 is a red quantum dot, the first light is blue light, and the second light is yellow light, the red quantum dot emits red light under excitation of the first light, i.e., blue light, and emits red light under excitation of the second light, i.e., green light in yellow light, and the third light is red light.

[0069] Exemplarily, as shown in FIG. 1, one pixel unit PU includes two second sub-pixels PX2. As shown in any one of FIG. 2 to FIG. 4, one pixel unit PU includes one second sub-pixel PX2.

[0070] In some embodiments, as shown in FIG. 2 or FIG. 3, the plurality of quantum dots QD includes the second type of quantum dots QD2, the second type of quantum dots QD2 is configured to emit a fourth light under excitation of the first light, the wavelength of the fourth light is greater than the wavelength of the first light, and the fourth light is the same color as the second light. And the at least one excitation sub-pixel PXJ includes a third sub-pixel PX3, the orthographic projection of the second type of quantum dots QD2 on the first substrate 111 is located within the range of the third sub-pixel PX3.

[0071] Exemplarily, the second type of quantum dots QD2 is a green quantum dot, the first light is blue light, and the second light is green light, the green quantum dot emits green light under excitation of the first light, i.e., blue light, and the fourth light is green light.

[0072] Exemplarily, as shown in FIG. 2 or FIG. 3, one pixel unit PU includes one third sub-pixel PX3.

[0073] In some embodiments, as shown in FIG. 4, the plurality of quantum dots QD includes third type quantum dots QD3, the third type quantum dots QD3 are configured to emit fifth light under excitation of the first light, the wavelength of the fifth light is greater than the wavelength of the first light, the fifth light is different in color from the second light, and the wavelength of the fifth light is less than or equal to the wavelength of the second light. And the at least one excitation sub-pixel PXJ includes a fourth sub-pixel PX4, the orthographic projection of the third type quantum dots QD3 on the first substrate 111 is located within the range of the fourth sub-pixel PX4.

[0074] Exemplarily, the third type quantum dots QD3 are green quantum dots, the first light is blue light, and the second light is yellow light, the green quantum dots emit green light under excitation of the first light, i.e., the fourth light is green light.

[0075] Exemplarily, as shown in FIG. 4, one pixel unit PU includes one fourth sub-pixel PX4.

[0076] In some embodiments, as shown in FIG. 5, the first light-emitting device LD1 includes a first anode 51, a first light-emitting layer 52 and a first cathode 53 which are sequentially stacked, the first anode 51 is arranged close to the first substrate 111, the first anode 51 is a reflective electrode, and the first cathode 53 is a semi-transparent and semi-reflective electrode.

[0077] Exemplarily, the first anode 51 includes a metal material such as Ag. The first cathode 53 includes a metal material such as Mg, Ag or an alloy thereof.

[0078] In order to improve the light-emitting efficiency, exemplarily, the first anode 51 and the first cathode 53 of the first light-emitting device LD1 form a strong microcavity structure, i.e., for light, the first anode 51 and the first cathode 53 form a cavity, so that the first light reciprocally oscillates between the first anode 51 and the first cathode 53 to be strengthened, thereby improving the light-emitting efficiency and reducing the power consumption.

[0079] In order to improve the light-emitting efficiency, exemplarily, as shown in FIG. 5, the first light-emitting device LD1 includes a plurality of first light-emitting layers 52 which are stacked and connected in series with each other, and a charge generation layer CGL is arranged between two adjacent first light-emitting layers 52 to connect the two adjacent first light-emitting layers 52 in series.

[0080] In some embodiments, as shown in FIG. 6, the second light-emitting device LD2 includes a second anode 61, a second light-emitting layer 62 and a second cathode 63 which are sequentially stacked, the second anode 61 is arranged close to the second substrate 121, the second anode 61 is a transparent electrode, and the first cathode 53 is a transparent electrode or a semi-transparent and semi-reflective electrode.

[0081] Exemplarily, the second anode 61 comprises a metal oxide material such as ITO. When the first cathode 53 is a transparent electrode, it comprises a metal oxide material such as IZO, for example. When the first cathode 53 is a transflective electrode, it comprises a metal material such as Mg, Ag or an alloy thereof, for example.

[0082] In some embodiments, as shown in FIG. 7, the second display substrate 12 further comprises a filter layer 71 disposed between the second light emitting device LD2 and the second substrate 121, comprising a plurality of filter patterns 71P located at different sub-pixels PX, the filter pattern 71P being configured to transmit light of a single color, and the filter pattern 71P and the orthographic projection of the quantum dots QD on the first substrate 111 have an overlap within a range of a single excitation sub-pixel PXJ.

[0083] As shown in FIG. 7, the filter pattern 71P is also disposed within the excitation sub-pixel PXJ provided with the quantum dots QD, which is conducive to the excitation sub-pixel PXJ emitting light of a single color and improving color purity. The first sub-pixel PX1 is not provided with the filter pattern 71P, which is conducive to improving light emitting efficiency and further reducing power consumption.

[0084] In some embodiments, as shown in FIG. 7, the first display substrate 11 further comprises a first encapsulation layer FZ1 disposed on a side of the first light emitting device LD1 away from the first substrate 111. The second display substrate 12 further comprises a second encapsulation layer FZ2 disposed on a side of the second light emitting device LD2 away from the second substrate 121. The first encapsulation layer FZ1 and the second encapsulation layer FZ2 each comprise a silicon-based thin film material.

[0085] Exemplarily, the first encapsulation layer FZ1 and the second encapsulation layer FZ2 can be formed by a chemical vapor deposition process, for example.

[0086] In some embodiments, as shown in FIG. 7, the display panel further comprises a filling layer TC disposed between the first display substrate 11 and the second display substrate 12, configured to fill the gap between adjacent quantum dots QD, comprising a solid material and / or a gas material.

[0087] In a specific implementation, the first light emitting device LD1 located in the first sub-pixel PX1 can be controlled to emit light so that the first sub-pixel PX1 emits first light; the second light emitting device LD2 located in the first sub-pixel PX1 can be controlled to emit light so that the first sub-pixel PX1 emits second light; the first light emitting device LD1 and the second light emitting device LD2 located in the first sub-pixel PX1 can be controlled to emit light so that the first sub-pixel PX1 emits mixed light of the first light and the second light.

[0088] In a specific implementation, the first light emitting device LD1 located in the excitation sub-pixel PXJ can be controlled to emit light so that the excitation sub-pixel PXJ emits light emitted by the quantum dots QD under excitation of the first light.

[0089] The technical solutions of the present disclosure will be described below in conjunction with FIGS. 1-4.

[0090] In a first example, the first light emitting device LD1 can emit blue light, and the second light emitting device LD2 can emit green light, i.e., the first light is blue light, and the second light is green light. As shown in FIG. 1, the pixel unit PU includes, from left to right, a first first sub-pixel PX1, a first second sub-pixel PX2, a second first sub-pixel PX1, and a second second sub-pixel PX2.

[0091] When the pixel unit PU displays blue, the first light emitting device LD1 in the first first sub-pixel PX1 can be controlled to emit light.

[0092] When the pixel unit PU displays green, the second light emitting device LD2 in the second first sub-pixel PX1 can be controlled to emit light.

[0093] When the pixel unit PU displays red, the first light emitting device LD1 in one or both of the second sub-pixels PX2 can be controlled to emit light, and the second light emitting device LD2 in one or both of the second sub-pixels PX2 can also be controlled to emit light. When the first light emitting device LD1 and the second light emitting device LD2 in the second sub-pixel PX2 both emit light, the light emitting efficiency and brightness of red light can be improved. In order to improve color purity, as shown in FIG. 7, the filter layer 71 can include a red filter pattern located in the second sub-pixel PX2, and the red filter pattern is used to transmit red light.

[0094] When the pixel unit PU displays white, the pixel unit PU can be controlled to display blue, green, and red at the same time.

[0095] When the pixel unit PU displays white, the first light emitting device LD1 and the second light emitting device LD2 in one or both of the first sub-pixels PX1 can also be controlled to emit light at the same time, and the pixel unit PU also emits red light.

[0096] In a second example, the first light emitting device LD1 can emit blue light, and the second light emitting device LD2 can emit green light, i.e., the first light is blue light, and the second light is green light. As shown in FIG. 2, the pixel unit PU includes, from left to right, a first sub-pixel PX1, a second sub-pixel PX2, and a third sub-pixel PX3.

[0097] When the pixel unit PU displays blue, the first light emitting device LD1 in the first sub-pixel PX1 can be controlled to emit light.

[0098] When the pixel unit PU displays green, the first light emitting device LD1 in the third sub-pixel PX3 can be controlled to emit light, and the second light emitting device LD2 in the third sub-pixel PX3 can also be controlled to emit light. When the first light emitting device LD1 and the second light emitting device LD2 in the third sub-pixel PX3 both emit light, the light emitting efficiency and brightness of green light can be improved. In order to improve the color purity, the filter layer 71 can include a green filter pattern located in the third sub-pixel PX3, which is used to transmit green light.

[0099] When the pixel unit PU displays red, the first light emitting device LD1 in the second sub-pixel PX2 can be controlled to emit light, and the second light emitting device LD2 in the second sub-pixel PX2 can also be controlled to emit light. When the first light emitting device LD1 and the second light emitting device LD2 in the second sub-pixel PX2 both emit light, the light emitting efficiency and brightness of red light can be improved. In order to improve the color purity, the filter layer 71 can include a red filter pattern located in the second sub-pixel PX2, which is used to transmit red light.

[0100] When the pixel unit PU displays white, the pixel unit PU can display blue, green and red at the same time.

[0101] When the pixel unit PU displays white, the first light emitting device LD1 and the second light emitting device LD2 in the first sub-pixel PX1 can also be controlled to emit light at the same time, and the pixel unit PU can also emit red light.

[0102] In a third example, the first light emitting device LD1 can emit blue light, and the second light emitting device LD2 can emit green light, i.e., the first light is blue light, and the second light is green light. As shown in FIG. 3, the pixel unit PU includes a first first sub-pixel PX1, a third sub-pixel PX3, a second first sub-pixel PX1 and a second sub-pixel PX2 from left to right.

[0103] When the pixel unit PU displays blue, the first light emitting device LD1 in the first first sub-pixel PX1 can be controlled to emit light.

[0104] When the pixel unit PU displays green, the first light emitting device LD1 in the third sub-pixel PX3 can be controlled to emit light, and the second light emitting device LD2 in the third sub-pixel PX3 can also be controlled to emit light. When the first light emitting device LD1 and the second light emitting device LD2 in the third sub-pixel PX3 both emit light, the light emitting efficiency and brightness of green light can be improved. In order to improve the color purity, the filter layer 71 can include a green filter pattern located in the third sub-pixel PX3, which is used to transmit green light.

[0105] When the pixel unit PU displays red, the first light emitting device LD1 in the second sub-pixel PX2 can be controlled to emit light, and the second light emitting device LD2 in the second sub-pixel PX2 can also be controlled to emit light. When the first light emitting device LD1 and the second light emitting device LD2 in the second sub-pixel PX2 both emit light, the light emitting efficiency and brightness of red light can be improved. In order to improve the color purity, the filter layer 71 can include a red filter pattern located in the second sub-pixel PX2, and the red filter pattern is used to transmit red light.

[0106] When the pixel unit PU displays white, the pixel unit PU can display blue, green and red at the same time.

[0107] When the pixel unit PU displays white, the first light emitting device LD1 and the second light emitting device LD2 in one or two first sub-pixels PX1 can also be controlled to emit light, and the pixel unit PU can also emit red light at the same time.

[0108] In the fourth example, the first light emitting device LD1 can emit blue light, and the second light emitting device LD2 can emit yellow light, that is, the first light is blue light, and the second light is yellow light. As shown in FIG. 4, the pixel unit PU includes a first first sub-pixel PX1, a fourth sub-pixel PX4, a second first sub-pixel PX1 and a second sub-pixel PX2 from left to right.

[0109] When the pixel unit PU displays blue, the first light emitting device LD1 in the first first sub-pixel PX1 can be controlled to emit light.

[0110] When the pixel unit PU displays green, the first light emitting device LD1 in the fourth sub-pixel PX4 can be controlled to emit light, and the first light emitting device LD1 and the second light emitting device LD2 in the second first sub-pixel PX1 can also be controlled to emit light. In order to improve the color purity, the filter layer 71 can include a green filter pattern located in the fourth sub-pixel PX4, and the green filter pattern is used to transmit green light.

[0111] When the pixel unit PU displays red, the first light emitting device LD1 in the second sub-pixel PX2 can be controlled to emit light, and the second light emitting device LD2 in the second sub-pixel PX2 can also be controlled to emit light. When the first light emitting device LD1 and the second light emitting device LD2 in the second sub-pixel PX2 both emit light, the light emitting efficiency and brightness of red light can be improved. In order to improve the color purity, the filter layer 71 can include a red filter pattern located in the second sub-pixel PX2, and the red filter pattern is used to transmit red light.

[0112] When the pixel unit PU displays white, the pixel unit PU can display blue, green and red at the same time.

[0113] When the pixel unit PU displays white color, the first light emitting device LD1 and the second light emitting device LD2 in one or two first sub-pixels PX1 can be controlled to emit light, and the white light is obtained by mixing the blue light and the yellow light, and there is no need to display red color, so that the power consumption can be further reduced.

[0114] The display device provided by the present disclosure comprises a display panel provided by any of the embodiments, and a driving assembly connected with the first display substrate 11 and the second display substrate 12 respectively, for driving the first light emitting device LD1 and the second light emitting device LD2 to emit light.

[0115] It can be understood by those skilled in the art that the display device provided by the present disclosure has the advantages of the display panel of any of the above-mentioned embodiments.

[0116] The display device provided by the present disclosure can be a display module, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a vehicle-mounted display device, a smart watch, a fitness wristband, a personal digital assistant, or any product or component with display function.

[0117] The present disclosure provides a driving method applied to the display panel provided by any of the embodiments, and the driving method comprises:

[0118] Step S01: controlling the first light emitting device LD1 located in the first sub-pixel PX1 to emit light, so that the first sub-pixel PX1 emits the first light.

[0119] Step S02: controlling the second light emitting device LD2 located in the first sub-pixel PX1 to emit light, so that the first sub-pixel PX1 emits the second light.

[0120] Step S03: controlling the first light emitting device LD1 and the second light emitting device LD2 located in the first sub-pixel PX1 to emit light, so that the first sub-pixel PX1 emits the mixed light of the first light and the second light.

[0121] Step S04: controlling the first light emitting device LD1 located in the excitation sub-pixel PXJ to emit light, so that the excitation sub-pixel PXJ emits the light emitted by the quantum dots QD under the excitation of the first light.

[0122] The specific steps of the driving method provided by the present disclosure can refer to the description of the display panel embodiments above, which will not be repeated here.

[0123] In the present disclosure, the meaning of "multiple" is two or more, and the meaning of "at least one" is one or more, unless otherwise explicitly and specifically limited.

[0124] In the present disclosure, the orientation or positional relationship indicated by the terms "upper", "lower", and the like is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of describing the present disclosure and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0125] In the present disclosure, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent in such a process, method, product, or device. Without more limitations, the element defined by the phrase "including a" does not exclude the presence of additional identical elements in the process, method, article, or device including the element.

[0126] In the present disclosure, the terms "one embodiment", "some embodiments", "exemplary embodiment", "one or more embodiments", "example", "an example", "some examples", and the like are intended to mean that the particular feature, structure, material, or characteristic related to that embodiment or example is included in at least one embodiment or example of the present disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. In addition, the particular feature, structure, material, or characteristic can be included in any appropriate manner in any one or more embodiments or examples.

[0127] In the present disclosure, the relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations.

[0128] In the present specification, "electrically connected" and "coupled" include the case where the constituent elements are connected together through an element having a certain electrical effect. The element having a certain electrical effect is not particularly limited as long as it can perform the transmission and reception of electrical signals between the connected constituent elements. Examples of the element having a certain electrical effect include not only electrodes and wiring, but also switching elements such as transistors, resistors, inductors, capacitors, other elements having various functions, and the like.

[0129] In the present specification, "disposed in the same layer" means that two (or more) structures are patterned by the same patterning process, and their materials can be the same or different. For example, the materials of the precursors forming the multiple structures disposed in the same layer are the same, and the final materials can be the same or different.

[0130] The polygons in the present specification are not strictly in the sense, and can be approximate triangles, rectangles, trapezoids, pentagons or hexagons, etc., there can be some small deformation caused by tolerances, there can be chamfers, round corners, arc edges and deformations, etc.

[0131] “A, B, and C at least one of” has the same meaning as “at least one of A, B, or C”, and includes the following combinations of A, B, and C: only A, only B, only C, a combination of A and B, a combination of A and C, a combination of B and C, and a combination of A, B, and C.

[0132] “A and / or B” includes the following three combinations: only A, only B, and a combination of A and B.

[0133] The use of “for” or “configured to” in the present disclosure means open and inclusive language that does not exclude devices suitable for or configured to perform additional tasks or steps.

[0134] As used in the present disclosure, “about”, “approximately” or “approximately” includes the stated value and the average value within an acceptable deviation range of the specific value, wherein the acceptable deviation range is determined by the person of ordinary skill in the art considering the measurement being discussed and the error related to the measurement of the specific quantity (i.e. the limitation of the measurement system).

[0135] As used in the present disclosure, “parallel”, “perpendicular”, “equal”, “flush” includes the stated case and the approximate case similar to the stated case, the range of which is within an acceptable deviation range, wherein the acceptable deviation range is determined by the person of ordinary skill in the art considering the measurement being discussed and the error related to the measurement of the specific quantity (i.e. the limitation of the measurement system). For example, “parallel” includes absolute parallel and approximate parallel, wherein the acceptable deviation range of approximate parallel can be, for example, within 10° or 5°; “perpendicular” includes absolute perpendicular and approximate perpendicular, wherein the acceptable deviation range of approximate perpendicular can also be, for example, within 10° or 5°. “Equal” includes absolute equality and approximate equality, wherein the acceptable deviation range of approximate equality can be, for example, that the difference between the two equalities is less than or equal to 5% of either one. “Flush” includes absolute flush and approximate flush, wherein the acceptable deviation range of approximate flush can be, for example, that the distance between the two flushes is less than or equal to 5% of the size of either one.

[0136] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or there can be an intermediate layer between the layer or element and the other layer or substrate.

[0137] The present disclosure describes example embodiments with reference to cross-sectional and / or plan view illustrations that are schematic illustrations of idealized embodiments. Variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and / or tolerances, are to be expected. Thus, examples embodiments should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, an etched region illustrated as a rectangle will, typically, have rounded or curved features. Thus, the regions illustrated in the figures are schematic and their shapes are not intended to illustrate the precise shape of a region of a device and are not intended to limit the scope of example embodiments.

[0138] It should be noted finally that the above examples are only used to illustrate the technical solutions of the present disclosure, and not to limit them; although the present disclosure has been described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A display panel, comprising a first display substrate, a quantum dot layer and a second display substrate which are sequentially stacked, the second display substrate being arranged close to a light-outgoing side; wherein the first display substrate comprising a first substrate and a plurality of first light-emitting devices arranged on a side of the first substrate close to the second display substrate, the first light-emitting devices being configured to emit first light; the second display substrate comprising a second substrate and a plurality of second light-emitting devices arranged on a side of the second substrate close to the first display substrate, the second light-emitting devices being configured to emit second light; the quantum dot layer comprising a plurality of quantum dots configured to emit light under excitation of the first light; and the display panel comprising a plurality of pixel units, each of the pixel units comprising a plurality of sub-pixels, a projection of the first light-emitting devices and the second light-emitting devices on the first substrate overlapping in a range of each of the sub-pixels, the first light and the second light being different in color, the plurality of sub-pixels in a same pixel unit comprising at least one excitation sub-pixel and at least one first sub-pixel, a projection of the quantum dots on the first substrate overlapping the excitation sub-pixel and not overlapping the first sub-pixel. The plurality of quantum dots comprises one type or a plurality of types of quantum dots, different types of quantum dots being capable of emitting different colors of light under excitation of the first light.

2. The display panel of claim 1, wherein, The plurality of quantum dots comprises first type quantum dots configured to emit third light under excitation of the first light and / or the second light, the third light being of a wavelength greater than that of the first light and at least part of the second light; and 3. The display panel of claim 1, wherein, The at least one excitation sub-pixel comprises a second sub-pixel, a projection of the first type quantum dots on the first substrate being in a range of the second sub-pixel. The plurality of quantum dots comprises second type quantum dots configured to emit fourth light under excitation of the first light, the fourth light being of a wavelength greater than that of the first light and the fourth light being of the same color as the second light; and 4. The display panel of claim 1, wherein, The at least one excitation sub-pixel comprises a third sub-pixel, a projection of the second type quantum dots on the first substrate being in a range of the third sub-pixel. The plurality of quantum dots comprises third type quantum dots configured to emit fifth light under excitation of the first light, the fifth light being of a wavelength greater than that of the first light, the fifth light being different in color from the second light and the fifth light being of a wavelength less than or equal to that of the second light; and 5. The display panel of claim 1, wherein, The at least one excitation sub-pixel comprises a fourth sub-pixel, a projection of the third type quantum dots on the first substrate being in a range of the fourth sub-pixel. The second light is of a wavelength greater than that of the first light.

6. The display panel according to any one of claims 1 to 5, wherein, The first light is blue light, and the second light comprises at least one of red light, green light and yellow light.

7. The display panel of claim 6, wherein, ​ 8. The display panel according to any one of claims 1 to 5, wherein, The first light-emitting device comprises a first anode, a first light-emitting layer and a first cathode which are sequentially stacked, the first anode is arranged close to the first substrate, the first anode is a reflective electrode, and the first cathode is a semi-transparent and semi-reflective electrode.

9. The display panel according to any one of claims 1 to 5, wherein, The second light-emitting device comprises a second anode, a second light-emitting layer and a second cathode which are sequentially stacked, the second anode is arranged close to the second substrate, the second anode is a transparent electrode, and the first cathode is a transparent electrode or a semi-transparent and semi-reflective electrode.

10. The display panel according to any one of claims 1 to 5, wherein, The first light-emitting device comprises a plurality of first light-emitting layers which are sequentially stacked and connected in series, and a charge generation layer is arranged between any two adjacent first light-emitting layers.

11. The display panel according to any one of claims 1 to 5, wherein, The second display substrate further comprises: A filter layer is arranged between the second light-emitting device and the second substrate, and comprises a plurality of filter patterns located in different sub-pixels, the filter patterns are used for transmitting light of a single color, and the filter patterns and the orthographic projection of the quantum dots on the first substrate overlap within the range of the excitation sub-pixel.

12. The display panel according to any one of claims 1 to 5, wherein, The first display substrate further comprises: A first encapsulation layer is arranged on the side of the first light-emitting device away from the first substrate. The second display substrate further comprises: A second encapsulation layer is arranged on the side of the second light-emitting device away from the second substrate. The first encapsulation layer and the second encapsulation layer both comprise a silicon-based thin film material.

13. The display panel according to any one of claims 1 to 5, wherein, The display panel further comprises: A filling layer is arranged between the first display substrate and the second display substrate, and is used for filling the gap between adjacent quantum dots, and comprises a solid material and / or a gaseous material.

14. A display device, comprising: The display panel according to any one of claims 1 to 13; and A driving assembly connected with the first display substrate and the second display substrate respectively, and used for driving the first light-emitting device and the second light-emitting device to emit light.

15. A driving method applied to the display panel according to any one of claims 1 to 13, and the driving method comprises: controlling the first light-emitting device located in the first sub-pixel to emit light, so that the first sub-pixel emits the first light; controlling the second light-emitting device located in the first sub-pixel to emit light, so that the first sub-pixel emits the second light; controlling the first light-emitting device and the second light-emitting device located in the first sub-pixel to emit light, so that the first sub-pixel emits mixed light of the first light and the second light; and controlling the first light-emitting device located in the excitation sub-pixel to emit light, so that the excitation sub-pixel emits light emitted by the quantum dots under excitation of the first light.

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