Display panel and display device

Abstract

The present application discloses a display panel and a display device, including a plurality of pixel areas, the pixel areas at least including light-emitting units of three primary colors, the display panel including an array substrate and a light-emitting device layer, the light-emitting device layer including at least one combined LED chip distributed in a preset pixel area, the combined LED chip including at least two light-emitting units, and at least one of the at least two light-emitting units is a red light-emitting unit, the number of green light-emitting units and blue light-emitting units in the preset pixel area is less than the number of red light-emitting units; wherein, in one frame time, the duty cycle of the light-emitting phase of the red light-emitting unit is less than 100%; in one frame time, the light-emitting time periods of different red light-emitting units in the same preset pixel area at least partially do not overlap, and the sum of the duty cycles of the light-emitting phases of multiple red light-emitting units is greater than or equal to 100%. The display panel provided by the present application can achieve both display effect and service life.

Description

Technical Field

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

[0002] Micro-LED (micro light emitting diode) display technology has gradually become the mainstream product of the next generation of display with its low power consumption, long life and high brightness. Like traditional light sources, Micro-LED will also generate heat during operation. Whether Micro-LED works stably and its quality is very important to the temperature of Micro-LED itself. If the temperature of Micro-LED is very high, its life will also be affected.

[0003] In the Micro-LED display panel in the related technology, since the luminous efficiency of Micro-LEDs of different colors is different, Micro-LEDs with low luminous efficiency need to generate heat for a long time to achieve the set display effect, which reduces the service life of the Micro-LEDs with low luminous efficiency. Therefore, it is difficult to achieve both the service life of the display panel and the luminous effect. Summary of the invention

[0004] Embodiments of the present application provide a display panel and a display device, wherein the display panel achieves both display effect and service life.

[0005] An embodiment of the first aspect of the embodiments of the present application provides a display panel, comprising a plurality of pixel areas distributed in an array, the pixel areas comprising at least light-emitting units of three primary colors, the display panel comprising an array substrate and a light-emitting device layer, the light-emitting device layer comprising at least one combined LED chip distributed in a preset pixel area, the combined LED chip comprising at least two light-emitting units, and at least one of the at least two light-emitting units is a red light-emitting unit, the number of green light-emitting units and the number of blue light-emitting units in the preset pixel area are both less than the number of red light-emitting units; wherein, in one frame time, the duty cycle of the light-emitting stage of the red light-emitting unit is less than 100%; in one frame time, the light-emitting time periods of different red light-emitting units in the same preset pixel area are at least partially non-overlapping, and the sum of the duty cycles of the light-emitting stages of multiple red light-emitting units is greater than or equal to 100%.

[0006] An embodiment of the second aspect of the present application further provides a display device, comprising the display panel provided by the first aspect of the present application.

[0007] In the display panel provided by the present application, the duty cycle of the light-emitting phase of the red light-emitting unit in the preset pixel area is set to be less than 100%, so as to improve the heating condition of the red light-emitting unit in the preset pixel area, prevent the brightness attenuation caused by long-term heating, and improve the service life of the red light-emitting unit in the preset pixel area, thereby improving the service life of the display panel. At the same time, a combined LED chip is set in the preset pixel area, and the combined LED chip includes at least one red light-emitting unit, and the number of red light-emitting units in the preset pixel area is greater than the number of green light-emitting units and blue light-emitting units, and in one frame time, the light-emitting time periods of different red light-emitting units in the same pixel area are at least partially non-overlapping, and the sum of the duty cycles of the light-emitting phases of multiple red light-emitting units is greater than or equal to 100%, so that while reducing the duty cycle of the light-emitting phase of each red light-emitting unit, the brightness of the red light-emitting unit in the preset pixel area is guaranteed to ensure the display effect of the display panel. The display panel provided in the present application improves the heat generation of a single red light-emitting unit in a preset pixel area, increases the service life of the red light-emitting unit in the preset pixel area, and reduces its brightness attenuation. On the other hand, after reducing the duty cycle of the light-emitting stage of a single red light-emitting unit in the preset pixel area, a combined LED chip is arranged in the preset pixel area to increase the total number of red light-emitting units, thereby achieving duty cycle distribution, ensuring the total light brightness, and thus ensuring the display effect of the display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0009] Figure 1 is a structural schematic diagram of a display panel provided in an embodiment of the present application;

[0010] Figure 2 yes Figure 1 A magnified view of a structure in the middle A area;

[0011] Figure 3 yes Figure 2 A schematic diagram of a cross-sectional structure in the direction opposite to B-B';

[0012] Figures 4 to 6 It is a schematic diagram of the duty cycle of each light-emitting unit in a preset pixel area of ​​a display panel of the present application;

[0013] Figure 7is a schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0014] Figure 8 is a schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0015] Fig. 9 is a schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0016] Figures 10 to 12 It is a schematic diagram of the duty cycle of each light-emitting unit in a preset pixel area of ​​another display panel of the present application;

[0017] Fig.13 is a schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0018] Fig.14 is a schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0019] Fig.15 is a schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0020] Figures 16 to 18 It is a schematic diagram of the duty cycle of each light-emitting unit in a preset pixel area of ​​another display panel of the present application;

[0021] Fig.19 is a schematic diagram of the structure of another display panel provided in an embodiment of the present application;

[0022] Fig. 20 It is a structural schematic diagram of a combined LED chip in a display panel provided in an embodiment of the present application;

[0023] Fig.21 It is a structural schematic diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0024] The features and exemplary embodiments of various aspects of the application will be described in detail below. In the detailed description below, many specific details are proposed to provide a comprehensive understanding of the application. However, it is obvious to those skilled in the art that the application can be implemented when some details in these specific details are not needed. The following description of the embodiments is only to provide a better understanding of the application by illustrating the example of the application.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0026] The inventors have found through research that the reason why it is difficult to achieve both the service life and the luminous effect of the display panel is that in the Micro-LED display panel, the luminous efficiency of the red light-emitting unit, the green light-emitting unit and the blue light-emitting unit is uneven. For example, under normal circumstances, the luminous efficiency of the red light-emitting unit is low, and the light emitted by the green light-emitting unit and the blue light-emitting unit is relatively strong, so that the displayed picture is prone to color deviation (for example, cyan). At this time, it is necessary to compensate for the color deviation by increasing the duty cycle of the red light-emitting unit during the light-emitting stage. However, the red light-emitting unit will generate severe heat after emitting light for a long time. The heat problem will cause the brightness of the red light-emitting unit to decay, affecting its service life. Therefore, it is difficult to achieve both the luminous effect and the service life of the display panel. Based on the research on the above problems, the inventors provide a display panel and a display device to comprehensively improve the display effect and service life of the display panel.

[0027] In order to better understand this application, Figures 1 to 21 The display panel and the display device according to the embodiments of the present application are described in detail.

[0028] See also Figures 1 to 3The embodiment of the present application provides a display panel 1, comprising a plurality of pixel areas 10, wherein the pixel areas 10 at least include light-emitting units 101 of three primary colors, the display panel 1 includes an array substrate 12 and a light-emitting device layer 11, the light-emitting device layer 11 includes at least one combined LED chip 13 distributed in a preset pixel area 10, the combined LED chip 13 includes at least two light-emitting units 101, and at least one of the at least two light-emitting units 101 is a red light-emitting unit 1011, and the number of green light-emitting units 1012 and blue light-emitting units 1013 in the preset pixel area 10 is less than the number of red light-emitting units 1011. In the preset pixel area 10, the duty cycle of the light-emitting phase of the red light-emitting unit 1011 is less than 100%; in one frame time, the light-emitting time periods of different red light-emitting units 1011 in the same preset pixel area 10 at least partially do not overlap, and the sum of the duty cycles of the light-emitting phases of the multiple red light-emitting units 1011 is greater than or equal to 100%.

[0029] In the display panel 1 provided in the present application, the duty cycle of the light-emitting stage of the red light-emitting unit 1011 in the preset pixel area 10 is set to be less than 100% to improve the heating condition of the red light-emitting unit 1011 in the preset pixel area 10, prevent the brightness attenuation due to long-term heating, and increase the service life of the red light-emitting unit 1011 in the preset pixel area 10, thereby increasing the service life of the display panel 1. At the same time, a combined LED chip is arranged in a preset pixel area 10, and the combined LED chip includes at least one red light-emitting unit 101, and the number of red light-emitting units 1011 in the preset pixel area 10 is greater than the number of green light-emitting units 1012 and blue light-emitting units 1013, and in one frame time, the light-emitting time periods of different red light-emitting units 1011 in the same pixel area 10 are at least partially non-overlapping, and the sum of the duty cycles of the light-emitting stages of the multiple red light-emitting units 1011 is greater than or equal to 100%, so that while reducing the duty cycle of the light-emitting stage of each red light-emitting unit 1011, the brightness of the red light-emitting unit 1011 in the preset pixel area 10 is guaranteed, so as to ensure the display effect of the display panel 1. The display panel 1 provided in the present application improves the heat generation of a single red light-emitting unit 1011 in a preset pixel area 10, increases the service life of the red light-emitting unit 1011 in the preset pixel area 10, and reduces its brightness attenuation. On the other hand, after reducing the duty cycle of the light-emitting stage of a single red light-emitting unit 1011 in the preset pixel area 10, a combined LED chip 13 is arranged in the preset pixel area 10 to increase the total number of red light-emitting units 1011, thereby achieving duty cycle distribution, ensuring the total light-emitting brightness, and thus ensuring the display effect of the display panel 1.

[0030] In the display panel 1 provided in the present application, the preset pixel area 10 is a pixel area 10 provided with a combined LED chip, and the number of the preset pixel areas 10 is equal to or less than the number of pixel areas 10, that is, at least one of the pixel areas 10 is a preset pixel area 10. When all the pixel areas 10 are preset pixel areas 10, the effect of improving heat generation of the display panel 1 can be further improved.

[0031] The display panel 1 provided in the present application includes a plurality of pixel areas 10, each pixel area 10 includes at least three primary color light-emitting units 101, that is, at least a red light-emitting unit 1011, a green light-emitting unit 1012 and a blue light-emitting unit 1013, and may also include a white light-emitting unit, which can further enhance the brightness of the display panel 1.

[0032] In the display panel 1 provided in the present application, the duty cycle of the driving current of the red light-emitting unit 1011 can be adjusted under constant current drive (the current size is constant, and different brightness displays are achieved through different duty cycles, i.e., PWM modulation) to achieve adjustment of the duty cycle of the light-emitting stage of the red light-emitting unit 1011.

[0033] In a possible implementation, Figure 3 As shown, the preset pixel area 10 includes a first LED chip 14 and two combined LED chips 13, and the two combined LED chips 13 include a first combined LED chip 131 and a second combined LED chip 132, wherein:

[0034] The first LED chip 14 includes a red light emitting unit 1011 .

[0035] The first combined LED chip 131 includes a red light emitting unit 1011 and a green light emitting unit 1012 .

[0036] The second combined LED chip 132 includes a red light emitting unit 1011 and a blue light emitting unit 1013 .

[0037] In the above embodiment, in the preset pixel area 10, a red light-emitting unit 1011 is combined with a green light-emitting unit 1012 to form a combined LED chip 13, and a red light-emitting unit 1011 is combined with a blue light-emitting unit 101 to form another combined LED chip 13, and also includes a first LED chip 14 including only one red light-emitting unit 1011, so that in the preset pixel area 10, the number of red light-emitting units 1011 is three, the number of green light-emitting units 1012 is one, and the number of blue light-emitting units 1013 is one, thereby increasing the number of red light-emitting units 1011 in the preset pixel area 10, so that the three red light-emitting units 1011 can reduce the duty cycle of their own light-emitting stage while ensuring the total light-emitting brightness of the red light-emitting units 1011, thereby achieving both the light-emitting brightness and the service life of the red light-emitting units 1011.

[0038] Further optionally, in the above embodiment, the duty cycle of the driving current of the red light emitting unit 1011 in the first LED chip 14 is set to D 1 , 50% ≤ D 1 <100%. Figure 4 As shown, D 1 =t 1 / T, in the present application, T is the duration of a frame time, and each t with a subscript is the duration of the driving current, that is, the light-emitting stage of the light-emitting unit.

[0039] The duty cycle of the driving current of the red light emitting unit 1011 in the first combined LED chip 131 is set to D 21 , 25% ≤ D 21 ≤30%, the duty cycle of the driving current of the green light emitting unit 1012 is D 22 , 2% ≤ D 22 ≤4%. Among them, Figure 5 As shown, D 21 =t 21 / T,D 22 =t 22 / T.

[0040] The duty cycle of the driving current of the red light emitting unit 1011 in the second combined LED chip 132 is set to D 31 , 25% ≤ D 31 ≤30%, the duty cycle of the driving current of the blue light emitting unit 1013 is D 32 , 2% ≤ D 32 ≤4%. Among them, Figure 6 As shown, D 31 =t 31 / T,D 32 =t32 / T.

[0041] In the above embodiment, the duty cycle of the light-emitting stage is shared by the red light-emitting units 1011 in the first LED chip 14, the first combined LED chip 131 and the second combined LED chip 132, thereby ensuring the total light-emitting brightness of the red light-emitting units 1011 in the preset pixel area 10, and making 50%≤D 1 <100%, 25%≤D 21 ≤30%、25%≤D 31 ≤30%, thereby making the sum of the duty cycles D of the red light-emitting units 1011: 100%≤D<160%, thereby not only reducing the duty cycle of the light-emitting stage of each red light-emitting unit 1011, improving the heat generation of each red light-emitting unit 1011, and increasing the service life, but also increasing the luminous brightness of the red light-emitting units 1011 in the preset pixel area 10, and improving the color cast problem of the displayed image caused by the luminous brightness of the blue light-emitting unit 1013 and the green light-emitting unit 1012 being higher than that of the red light-emitting unit 1011.

[0042] In the above embodiment, three red light-emitting units 1011 are provided in the preset pixel area 10 to share the duty cycle. The number of red light-emitting units 1011 is relatively large. Therefore, the duty cycle of each red light-emitting unit 1011 can be further reduced while achieving the preset brightness, so as to further improve the service life of the red light-emitting unit 1011.

[0043] In the above embodiment, the duty cycle D of the blue light emitting unit 1013 is 32 :2%≤D 32 ≤4%, the duty cycle D of the green light emitting unit 1012 22 :2%≤D 22 ≤4%. Since the material properties of the blue light-emitting unit 1013 and the green light-emitting unit 1012 are different from those of the red light-emitting unit 1011, the blue light-emitting unit 1013 and the green light-emitting unit 1012 have better luminous efficiency, and high-brightness display can be achieved by controlling the duty cycle of the blue light-emitting unit 1013 and the green light-emitting unit 1012 to 2% to 4%.

[0044] Further optionally, in a feasible implementation manner, please refer again to Figure 3The first LED chip 14, the first combined LED chip 131 and the second combined LED chip 132 are arranged in sequence, and in the first combined LED chip 131, the green light-emitting unit 1012 is located on the side of the red light-emitting unit 1011 facing the first LED chip 14, and in the second combined LED chip 132, the blue light-emitting unit 1013 is located on the side of the red light-emitting unit 1011 facing the first combined LED chip 131.

[0045] Or, if Figure 7 As shown, the first LED chip 14, the second combined LED chip 132 and the first combined LED chip 131 are arranged in sequence, and in the second combined LED chip 132, the blue light-emitting unit 1013 is located on the side of the red light-emitting unit 1011 facing the first LED chip 14, and in the first combined LED chip 131, the green light-emitting unit 1012 is located on the side of the red light-emitting unit 1011 facing the second combined LED chip 132.

[0046] Or, if Figure 8 As shown, the first LED chip 14 is located between the first combined LED chip 131 and the second combined LED chip 132, and, in the first combined LED chip 131, the green light-emitting unit 1012 is located on the side of the red light-emitting unit 1011 facing the first LED chip 14; in the second combined LED chip 132, the blue light-emitting unit 1013 is located on the side of the red light-emitting unit 1011 facing the LED chip.

[0047] In the above embodiment, no matter whether any one of the first LED chip 14, the first combined LED chip 131, and the second combined LED chip 132 is placed in the middle position, the placement positions of the light-emitting units 101 in the first combined LED chip 131 and the second combined LED chip 132 can be adjusted to achieve that red light-emitting units 1011 are provided on both sides of the blue light-emitting unit 1013 and the green light-emitting unit 1012, so that the light-emitting units 101 of the three primary colors are arranged at intervals, so that the color mixing in the preset pixel area 10 is more uniform and the display effect is better.

[0048] Optionally, in a feasible implementation manner, as Fig. 9 As shown, the preset pixel area 10 includes two LED chips and a combined LED chip 13, and the two LED chips include a second LED chip 15 and a third LED chip 16, wherein:

[0049] The second LED chip 15 includes a red light emitting unit 1011 .

[0050] The combined LED chip 13 includes a red light emitting unit 1011 and a green light emitting unit 1012 .

[0051] The third LED chip 16 includes a blue light emitting unit 1013 .

[0052] In the above embodiment, in the preset pixel area 10, a combined LED chip 13 is formed by combining a red light-emitting unit 1011 and a green light-emitting unit 1012, and also includes a second LED chip 15 including only one red light-emitting unit 101, so that in the preset pixel area 10, the number of red light-emitting units 1011 is two, the number of green light-emitting units 1012 is one, and the number of blue light-emitting units 1013 is one. The number of red light-emitting units 1011 in the preset pixel area 10 is increased by a combined LED chip 13, so that the two red light-emitting units 1011 can reduce the duty cycle of their own light-emitting stage while ensuring the total light-emitting brightness of the red light-emitting units 1011, thereby achieving both the light-emitting brightness and the service life of the red light-emitting units 1011.

[0053] Further optionally, in a feasible implementation manner, the duty cycle of the driving current of the red light emitting unit 1011 in the second LED chip 15 is D 10 , 50% ≤ D 10 <100%. Fig.10 As shown, D 10 =t 10 / T.

[0054] The duty cycle of the driving current of the red light emitting unit 1011 in the combined LED chip 13 is D 23 , 50% ≤ D 23 <100%, duty cycle D of the driving current of the green light emitting unit 1012 24 , 2% ≤ D 24 ≤4%. Among them, Fig.11 As shown, D 22 =t 23 / T,D 1 =t 24 / T.

[0055] The duty ratio D of the driving current of the blue light emitting unit 1013 in the third LED chip 16 is 30 , 2% ≤ D 30 ≤4%. Among them, Fig.12 As shown, D 30 =t 30 / T.

[0056] In the above embodiment, the duty cycle of the light-emitting stage is shared by the red light-emitting units 1011 in the second LED chip 15 and the combined LED chip 13, thereby improving the heating condition of each red light-emitting unit 1011 and helping to increase its service life; and two red light-emitting units 1011 are set in the preset pixel area 10, and 50%≤D 10 <100%, 50%≤D 23 <100%, the sum D of the duty cycles of the red light-emitting units 1011: 100%≤D<200%, which can ensure the total luminous brightness of the red light-emitting units 1011 in the preset pixel area 10, and the brightness can be further improved by adjusting the duty cycle of at least one red light-emitting unit, thereby improving the color cast problem of the displayed image caused by the luminous brightness of the blue light-emitting unit 1013 and the green light-emitting unit 1012 being higher than that of the red light-emitting unit 1011.

[0057] In the above embodiment, the duty cycle is shared by setting two red light-emitting units 1011 in the preset pixel area 10. Therefore, a part of the duty cycle of each red light-emitting unit 1011 can be shared by another red light-emitting unit 1011, thereby improving the heating condition of each red light-emitting unit 1011 and increasing its service life. At the same time, the preset pixel area 10 is provided with red light by two red light-emitting units 1011, which can ensure the light brightness of the red light-emitting unit 1011, thereby improving color deviation and ensuring display effect.

[0058] In the above embodiment, the duty cycle D of the blue light emitting unit 1013 is 30 :2%≤D 30 ≤4%, the duty cycle D of the green light emitting unit 1012 24 :2%≤D 24 ≤4%. Due to the difference in material properties between the blue light emitting unit 1013 and the green light emitting unit 1012 and the red light emitting unit 1011, high brightness display can be achieved by controlling the duty cycle of the blue light emitting unit 1013 and the green light emitting unit 1012 to 2% to 4%, thereby saving power consumption while ensuring normal display brightness requirements.

[0059] Further optionally, in a feasible implementation manner, please refer again to Fig. 9 The second LED chip 15, the combined LED chip 13 and the third LED chip 16 are arranged in sequence, and in the combined LED chip 13, the green light emitting unit 1012 is located on the side of the red light emitting unit 1011 facing the second LED chip 15.

[0060] Or, if Fig.13As shown, the second LED chip 15 , the third LED chip 16 and the combined LED chip 13 are arranged in sequence, and in the combined LED chip 13 , the green light emitting unit 1012 is located on the side of the red light emitting unit 1011 facing the third LED chip 16 .

[0061] Or, if Fig.14 As shown, the second LED chip 15 is located between the combined LED chip 13 and the third LED chip 16 , and in the combined LED chip 13 , the green light emitting unit 1012 is located on the side of the red light emitting unit 1011 facing the second LED chip 15 .

[0062] In the above embodiment, no matter whether any one of the second LED chip 15, the combined LED chip 13, and the third LED chip 16 is placed in the middle position, the placement position of the light-emitting unit 101 in the combined LED chip 13 can be adjusted to achieve that the blue light-emitting unit 1013 is adjacent to at least one red light-emitting unit 1011, the green light-emitting unit 1012 is adjacent to at least one red light-emitting unit 1011, and the two red light-emitting units 1011 are not adjacent, so that the light-emitting units 101 of the three primary colors are arranged at intervals, so that the color mixing in the preset pixel area 10 is more uniform and the display effect is better.

[0063] Optionally, in a feasible implementation manner, as Fig.15 As shown, the preset pixel area 10 includes a combined LED chip 13 and two LED chips, and the two LED chips include a fourth LED chip 17 and a fifth LED chip 18, wherein:

[0064] The combined LED chip 13 includes two red light emitting units 1011 .

[0065] The fourth LED chip 17 includes a green light emitting unit 1012 .

[0066] The fifth LED chip 18 includes a blue light emitting unit 1013 .

[0067] In the above embodiment, in the preset pixel area 10, two red light-emitting units 1011 are combined to form a combined LED chip 13, and a fourth LED chip 17 including only one green light-emitting unit 1012 and a fifth LED chip 18 including only one blue light-emitting unit 1013 are also included, so that in the preset pixel area 10, the number of red light-emitting units 1011 is two, the number of green light-emitting units 1012 is one, and the number of blue light-emitting units 1013 is one. The number of red light-emitting units 1011 in the preset pixel area 10 is increased by a combined LED chip 13, so that the two red light-emitting units 1011 can reduce the duty cycle of their own light-emitting stage while ensuring the total light-emitting brightness of the red light-emitting units 1011, so as to achieve both the light-emitting brightness and the service life of the red light-emitting units 1011. At the same time, the two red light-emitting units 1011 are set in the same combined LED chip, which has high integration and is simpler than the preparation process of integrating two light-emitting units of different colors into the same combined LED chip.

[0068] In the above embodiment, the duty cycle D of the driving current of each red light emitting unit 1011 in the combined LED chip 13 is 11 , 50% ≤ D 11 <100%. Fig.16 As shown, the durations of the driving currents of the two red light-emitting units when they are at a high level are t 11a and t 11b , t 11a and t 11b Can be the same or different, D 11 =t 11a / T, or, D 11 =t 11b / T.

[0069] The duty cycle D of the driving current of the green light emitting unit 1012 in the fourth LED chip 17 is 20 , 2% ≤ D 20 ≤4%. Among them, Fig.17 As shown, D 20 =t 20 / T.

[0070] The duty ratio D of the driving current of the blue light emitting unit 1013 in the fifth LED chip 18 is 30 , 2% ≤ D 30 ≤4%. Among them, Fig.18 As shown, D 30 =t 30 / T.

[0071] In the above embodiment, the duty cycle of the light-emitting stage is shared by combining two red light-emitting units 1011 in the LED chip 13, thereby ensuring the total light-emitting brightness of the red light-emitting units 1011 in the preset pixel area 10, and making the duty cycle D of each red light-emitting unit 1011 11 :50%≤D 11 <100%, the sum D of the duty cycles of the red light-emitting units 1011: 100%≤D<200%, thereby not only reducing the duty cycle of the light-emitting stage of each red light-emitting unit 1011, thereby improving the heat generation of each red light-emitting unit 1011 and increasing the service life, but also increasing the luminous brightness of the red light-emitting units 1011 in the preset pixel area 10, thereby improving the color cast problem of the displayed image caused by the luminous brightness of the blue light-emitting unit 1013 and the green light-emitting unit 1012 being higher than that of the red light-emitting unit 1011.

[0072] In the above embodiment, two red light-emitting units 1011 are set in the preset pixel area 10 to share the duty cycle. Therefore, the duty cycle adjustment of each red light-emitting unit 1011 can be shared by another red light-emitting unit 1011, thereby improving the heating condition of each red light-emitting unit 1011 and increasing its service life. At the same time, the two red light-emitting units 1011 provide red light, which can ensure the light brightness of the red light-emitting unit 1011, thereby improving color deviation and ensuring the display effect.

[0073] In the above embodiment, the duty cycle D of the blue light emitting unit 1013 is 20 :2%≤D 20 ≤4%, the duty cycle D of the green light emitting unit 1012 30 :2%≤D 30 Due to the difference between the material properties of the blue light emitting unit 1013 and the green light emitting unit 1012 and the material properties of the red light emitting unit 1011, high brightness display can be achieved by controlling the duty cycle of the blue light emitting unit 1013 and the green light emitting unit 1012 to 2% to 4%.

[0074] It should be noted that the arrangement of the LED chips and the combined LED chips in the preset pixel area of ​​the display panel provided in the present application is not limited to the above arrangement. Fig.19As shown, when the preset pixel area includes the first LED chip 14, the first combined LED chip 131 and the second combined LED chip 132, among the three chips, the first LED chip 14 and the first combined LED chip 131 can be arranged along the first direction x, and the second combined LED chip 132 can be located on the side of the first LED chip 14 and the first combined LED chip 131 along the second direction y. At this time, the red light-emitting unit 1011 in the first combined LED chip 131 can be placed on the side away from the first LED chip 14 along the first direction x, and the second combined LED chip 132 can be placed so that the red light-emitting unit 1011 and the blue light-emitting unit 1013 are arranged along the second direction y, and the red light-emitting unit 1011 is located on the side away from the first LED chip 14 and the first combined LED chip 131. In this way, sufficient light mixing can be achieved in the preset pixel area 10, and the display effect of the display panel 1 can be improved. This application does not limit the arrangement of LED chips and combined LED chips in the pixel area 10.

[0075] It can be understood that in order to make the display panel 1 take into account both the service life and the luminous effect, therefore, when adjusting the duty cycle of the red light-emitting unit 1011, it is necessary to take into account the luminous efficiency and luminous brightness of the red light-emitting unit 1011, so that the display panel performance is better. Specifically, the luminous efficiency of the conventional red light-emitting unit is set to P, and the sum of the luminous efficiencies of all the red light-emitting single lights in the preset pixel area is Q, then, Q = k*P, where x is the total correction coefficient of the luminous efficiency of the red light-emitting unit in the preset pixel area, and 0 < k ≤ 1, and the sum of the duty cycles of the red light-emitting units in the combined LED chip is adjusted to 1 / k to achieve the effect of the conventional red light-emitting unit, while improving the heating condition of the red light-emitting unit 1011, increasing the service life, and achieving a balance between luminous brightness and service life. The sum of the duty cycles can also be adjusted to be slightly greater than 1 / k to increase the brightness of the display panel.

[0076] Optionally, in a feasible implementation manner, as Fig. 20 As shown, the combined LED chip 13 includes a reflective electrode 133, a first conductive layer 134, a barrier layer 135, a light-emitting material layer 136 and a second conductive layer 137 which are stacked in sequence, wherein:

[0077] The light emitting material layer 136 includes at least two light emitting material regions 1361 , and an isolation layer 140 is disposed between adjacent light emitting material regions 1361 .

[0078] A first electrode 138 is further formed on a surface of the reflective electrode 133 facing the first conductive layer 134 .

[0079] A second electrode 139 corresponding to each light emitting material region 1361 is formed on a side of the second conductive layer 137 facing away from the second conductive layer 137 .

[0080] In the above embodiment, an isolation layer is provided in the light-emitting material layer 136 to isolate adjacent light-emitting material areas 1361, thereby realizing independent light emission or combined light emission of different light-emitting material areas 1361, that is, dividing an LED chip into multiple sub-chips, and the multiple sub-chips share a first electrode 138, and each sub-chip has a second electrode 139, so that the preset sub-chip can emit light by connecting the first electrode and the preset second electrode 139, thereby realizing independent light emission of each sub-chip, and the first electrode 138 and each second electrode 139 can also be connected at the same time to realize simultaneous light emission of each sub-chip.

[0081] In the above implementation, the number of light-emitting units 101 in the pixel area 10 can be increased without increasing the number of devices, so that the integration of devices in the display panel 1 is higher.

[0082] In the above embodiment, the light emitting material layer 136 includes at least two light emitting material areas 1361. The colors of the light emitting material areas 1361 in the light emitting material layer 136 can be the same or different, which can be determined according to actual needs. The first conductive layer can be a P-type conductive layer, and the second conductive layer can be an N-type conductive layer. The material of the reflective electrode side can be a transparent conductive material, such as indium tin oxide.

[0083] In a feasible implementation, the regions of the combined LED chip 13 opposite to the respective luminescent material regions 1361 emit light of different colors, wherein at least one region opposite to the luminescent material region 1361 emits red light.

[0084] In the above embodiment, in the combined LED chip 13, the light-emitting material area 1361 for emitting red light and the light-emitting material area 1361 for emitting green light or blue light are integrated into the same combined LED chip 13, so as to increase the red light-emitting unit 1011 in the pixel area 10, so that the duty cycle is shared by different red light-emitting units 1011, the power consumption of each red light-emitting unit 1011 is reduced, the heat generation condition is improved, and red light is provided by different red light-emitting units 1011 to ensure the brightness of the display panel 1 and prevent color deviation.

[0085] The present application also provides a display device, such as Fig.21 As shown, it includes any one of the display panels 1 provided in the above embodiments of the present application.

[0086] In the display device provided in the present application, the heat generation of the red light-emitting unit 1011 is improved, thereby alleviating the brightness attenuation problem. At the same time, the luminous efficiency of the red light, that is, the luminous brightness, is guaranteed, preventing the color cast of the display screen (for example, the screen is cyan), thereby achieving a better display effect and a stronger user experience.

[0087] The display device provided in the present application may be a mobile terminal such as a mobile phone or a tablet computer, or a fixed terminal such as a television or a monitor, or a vehicle-mounted display device, a wearable device, etc., and the present application does not make any special limitation.

[0088] According to the embodiments of the present application as above, these embodiments do not describe all the details in detail, nor do they limit the invention to specific embodiments. Obviously, many modifications and changes can be made based on the above description. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present application, so that those skilled in the art can make good use of the present application and the modifications based on the present application. The present application is only limited by the claims and their full scope and equivalents.

Claims

1. A display panel comprising a plurality of pixel regions, wherein the pixel regions at least include light-emitting units of three primary colors, characterized in that: The display panel comprises: An array substrate; A light-emitting device layer, wherein the light-emitting device layer includes at least one combined LED chip distributed in the preset pixel area, the combined LED chip includes at least two light-emitting units, and at least one of the at least two light-emitting units is a red light-emitting unit, and the number of the green light-emitting units and the blue light-emitting units in the preset pixel area is less than the number of the red light-emitting units; Among them, the duty cycle of the light-emitting stage of the red light-emitting unit is less than 100%; in one frame time, the light-emitting time periods of different red light-emitting units in the same preset pixel area do not overlap at least partially, and the sum of the duty cycles of the light-emitting stages of multiple red light-emitting units is greater than or equal to 100%.

2. The display panel according to claim 1, characterized in that: The preset pixel area includes a first LED chip and two combined LED chips, and the two combined LED chips include a first combined LED chip and a second combined LED chip, wherein: The first LED chip includes a red light-emitting unit; The first combined LED chip includes a red light-emitting unit and a green light-emitting unit; The second combined LED chip includes a red light emitting unit and a blue light emitting unit.

3. The display panel according to claim 2, characterized in that: The duty cycle of the driving current of the red light-emitting unit in the first LED chip is D1, 50%≤D1<100%; The duty cycle of the driving current of the red light-emitting unit in the first combined LED chip is D 21 , 25% ≤ D 21 ≤30%, the duty cycle of the driving current of the green light-emitting unit is D 22 , 2% ≤ D 22 ≤4%; The duty cycle of the driving current of the red light-emitting unit in the second combined LED chip is D 31 , 25% ≤ D 31 ≤30%, the duty cycle of the driving current of the blue light emitting unit is D 32 , 2% ≤ D 32 ≤4%.

4. The display panel according to claim 2, characterized in that: The first LED chip, the first combined LED chip, and the second combined LED chip are arranged in sequence, and in the first combined LED chip, the green light-emitting unit is located on the side of the red light-emitting unit facing the first LED chip, and in the second combined LED chip, the blue light-emitting unit is located on the side of the red light-emitting unit facing the first combined LED chip; or, The first LED chip, the second combined LED chip and the first combined LED chip are arranged in sequence, and in the second combined LED chip, the blue light-emitting unit is located on the side of the red light-emitting unit facing the first LED chip, and in the first combined LED chip, the green light-emitting unit is located on the side of the red light-emitting unit facing the second combined LED chip; or The first LED chip is located between the first combined LED chip and the second combined LED chip, and in the first combined LED chip, the green light-emitting unit is located on the side of the red light-emitting unit facing the first LED chip; in the second combined LED chip, the blue light-emitting unit is located on the side of the red light-emitting unit facing the LED chip.

5. The display panel according to claim 1, characterized in that: The preset pixel area includes two LED chips and one combined LED chip, wherein the two LED chips include a second LED chip and a third LED chip, wherein: The second LED chip includes a red light-emitting unit; The combined LED chip includes a red light-emitting unit and a green light-emitting unit; The third LED chip includes a blue light-emitting unit.

6. The display panel according to claim 5, characterized in that: The duty cycle of the driving current of the red light-emitting unit in the second LED chip is D 10 , 50% ≤ D 10 <100%; The duty cycle of the driving current of the red light-emitting unit in the combined LED chip is D 23 , 50% ≤ D 23 <100%, duty cycle D of the driving current of the green light emitting unit 24 , 2% ≤ D 24 ≤4%; The duty ratio D of the driving current of the blue light-emitting unit in the third LED chip is 30 , 2% ≤ D 30 ≤4%.

7. The display panel according to claim 6, characterized in that: The second LED chip, the combined LED chip and the third LED chip are arranged in sequence, and in the combined LED chip, the green light-emitting unit is located on the side of the red light-emitting unit facing the second LED chip; or The second LED chip, the third LED chip and the combined LED chip are arranged in sequence, and in the combined LED chip, the green light-emitting unit is located on the side of the red light-emitting unit facing the third LED chip; or The second LED chip is located between the combined LED chip and the third LED chip, and in the combined LED chip, the green light emitting unit is located on a side of the red light emitting unit facing the second LED chip.

8. The display panel according to claim 1, characterized in that: The preset pixel area includes one of the combined LED chips and two LED chips, and the two LED chips include a fourth LED chip and a fifth LED chip, wherein: The combined LED chip includes two red light-emitting units; The fourth LED chip includes a green light-emitting unit; The fifth LED chip includes a blue light-emitting unit.

9. The display panel according to claim 8, characterized in that: The duty cycle D of the driving current of each red light emitting unit in the combined LED chip is 11 , 50% ≤ D 11 <100%; The duty ratio D of the driving current of the green light-emitting unit in the fourth LED chip is 20 , 2% ≤ D 20 ≤4%; The duty ratio D of the driving current of the blue light-emitting unit in the fifth LED chip is 30 , 2% ≤ D 30 ≤4%.

10. The display panel according to claim 1, characterized in that: The combined LED chip comprises a reflective electrode, a first conductive layer, a barrier layer, a light-emitting material layer, and a second conductive layer which are stacked in sequence, wherein: The luminescent material layer comprises at least two luminescent material regions, and an isolation layer is arranged between adjacent luminescent material regions; A first electrode is also formed on a surface of the reflective electrode layer facing the first conductive layer; A second electrode corresponding to each of the light-emitting material regions is formed on a side of the second conductive layer facing away from the second conductive layer.

11. The display panel according to claim 10, characterized in that: The regions of the combined LED chip that are opposite to the respective luminescent material regions emit light of different colors, wherein at least one region that is opposite to the luminescent material region emits red light.

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

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