Display light-emitting device, display screen and electronic equipment

Abstract

The invention discloses a display light-emitting device, a display screen and electronic equipment, and belongs to the technical field of electronics. The display light-emitting device comprises a plurality of pixel units, each pixel unit comprises a first light-emitting diode and a second light-emitting diode, the first light-emitting diode is a single-layer organic light-emitting diode, and the second light-emitting diode is a tandem organic light-emitting diode; the plurality of pixel driving circuits are respectively connected with the plurality of pixel units in a one-to-one correspondence manner; in the first light-emitting mode, each pixel driving circuit is used for controlling the first light-emitting diode and the second light-emitting diode in the corresponding pixel unit to be turned on, and in the second light-emitting mode, each pixel driving circuit is used for controlling the first light-emitting diode in the corresponding pixel unit to be turned on and controlling the second light-emitting diode to be turned off.

Description

Technical Field

[0001] The present application belongs to the field of electronic technology, and specifically relates to a display light-emitting device, a display screen and an electronic device. Background Art

[0002] AMOLED (Active Matrix Organic Light Emitting Diode) display technology has the characteristics of high contrast, fast response speed, wide viewing angle and wide color gamut. It has been widely used in smart phones and smart watches.

[0003] With the development of display technology, in order to meet the ever-increasing demand of users for high resolution, high refresh rate, high brightness and long life, the power consumption of screens is also increasing. Based on this, Tandem OLED (Tandem Organic Light Emitting Diode) display technology, which has significant advantages over conventional SingleOLED (Single Organic Light Emitting Diode) in terms of life, brightness and power consumption, has gradually attracted widespread attention.

[0004] However, although Tandem OLED has significant advantages over conventional Single OLED in terms of lifespan, brightness and power consumption, and can meet the requirements of high brightness and low power consumption in medium and high brightness light-emitting modes, its performance in low brightness light-emitting modes is often unsatisfactory. Specifically, compared with conventional Single OLED, Tandem OLED is more difficult to control the current of different sub-pixels in low brightness light-emitting modes. Therefore, display light-emitting devices using Tandem OLED are more likely to produce color cast and Mura (defects, flaws, spots on the display device where the local brightness or chromaticity suddenly increases or decreases) in low brightness light-emitting modes, which reduces the display effect of the display light-emitting device in low brightness light-emitting modes. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a display light-emitting device, a display screen and an electronic device, which can improve the display effect of the display light-emitting device using Tandem OLED in a low-brightness light-emitting mode.

[0006] In a first aspect, an embodiment of the present application provides a display light-emitting device, comprising: a plurality of pixel units, each pixel unit comprising a first light-emitting diode and a second light-emitting diode, the first light-emitting diode being a single-layer organic light-emitting diode, and the second light-emitting diode being a series-connected organic light-emitting diode; a plurality of pixel driving circuits, respectively connected to the plurality of pixel units in a one-to-one correspondence; in a first light-emitting mode, each pixel driving circuit is used to control the first light-emitting diode and the second light-emitting diode in the corresponding pixel unit to be turned on, and in a second light-emitting mode, each pixel driving circuit is used to control the first light-emitting diode in the corresponding pixel unit to be turned on, and to control the second light-emitting diode to be turned off.

[0007] In a second aspect, an embodiment of the present application provides a display screen, comprising: the display light-emitting device of the first aspect.

[0008] In a third aspect, an embodiment of the present application provides an electronic device, comprising: a main body; and the display screen of the second aspect.

[0009] The display light-emitting device provided in the embodiment of the present application includes a plurality of pixel units and a plurality of pixel driving circuits. Among them, the plurality of pixel driving circuits are respectively connected to the plurality of pixel units in a one-to-one correspondence. Further, each pixel unit includes a first light-emitting diode and a second light-emitting diode, the first light-emitting diode is a single-layer organic light-emitting diode, and the second light-emitting diode is a series-connected organic light-emitting diode. Further, in the first light-emitting mode, each pixel driving circuit is used to control the first light-emitting diode and the second light-emitting diode in the corresponding pixel unit to be turned on, and in the second light-emitting mode, each pixel driving circuit is used to control the first light-emitting diode in the corresponding pixel unit to be turned on, and to control the second light-emitting diode to be turned off. Through the above-mentioned display light-emitting device, the pixel unit is divided into two parts, a single-layer organic light-emitting diode and a series-connected organic light-emitting diode. In the first light-emitting mode with a higher light-emitting brightness, a single-layer organic light-emitting diode and a series-connected organic light-emitting diode are used simultaneously for light-emitting display, and in the second light-emitting mode with a lower light-emitting brightness, only a single-layer organic light-emitting diode is used for light-emitting display. In this way, the display light-emitting device can switch the working mode of the pixel unit based on the requirements for light brightness in different light-emitting modes, and can improve the display effect of the display light-emitting device in the low-brightness light-emitting mode while meeting the high-brightness and low-power consumption requirements of the display light-emitting device in the high-brightness light-emitting mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 A schematic diagram of the structure of a display light-emitting device provided in an embodiment of the present application;

[0011] Figure 2 A schematic diagram of the structure of a first light emitting diode provided in an embodiment of the present application;

[0012] Figure 3 A schematic diagram of the structure of a second light emitting diode provided in an embodiment of the present application;

[0013] Figure 4 is a structural schematic diagram of a pixel unit in the related art;

[0014] Figure 5 One of the structural schematic diagrams of the pixel unit provided in the embodiment of the present application;

[0015] Figure 6 The second structural diagram of the pixel unit provided in the embodiment of the present application;

[0016] Figure 7 The third structural diagram of the pixel unit provided in the embodiment of the present application;

[0017] Figure 8 A working principle diagram of a display light-emitting device provided in an embodiment of the present application;

[0018] Fig. 9 A structural block diagram of a display screen provided in an embodiment of the present application;

[0019] Fig.10 A structural block diagram of an electronic device provided in an embodiment of the present application.

[0020] Reference numerals:

[0021] 100 displays a light-emitting device, 102 a pixel unit, 104 a pixel driving circuit, 106 a first light-emitting diode, 108 a second light-emitting diode, 110 a first switch group, 112 a first power supply, 114 a second switch group, 116 a first transistor, 118 a first signal port, 120 a second transistor, 122 a third transistor, 124 a fourth transistor, 126 a second signal port, 128 a capacitor element, 130 a fifth transistor, 132 a second power supply, 134 a third signal port, 136 a sixth transistor, 138 a fourth signal port, 140 a fifth signal port, 142 a seventh transistor, 144 an eighth transistor, 146 a third power supply, 148 a sixth signal port, 150 a fourth power supply, 152 a fifth power supply. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present application.

[0023] The features of the terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, the meaning of "plurality" is two or more.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] Combine the following Figure 1-Figure 10 The display light emitting device, display screen and electronic device according to the embodiments of the present application are described in detail.

[0026] like Figure 1 As shown, the embodiment of the present application provides a display light emitting device 100 , wherein the display light emitting device 100 includes a plurality of pixel units 102 and a plurality of pixel driving circuits 104 .

[0027] The plurality of pixel driving circuits 104 are connected to the plurality of pixel units 102 in a one-to-one correspondence.

[0028] Furthermore, each pixel unit 102 includes a first light emitting diode 106 and a second light emitting diode 108 , and the first light emitting diode 106 and the second light emitting diode 108 in one pixel unit 102 share one pixel driving circuit 104 .

[0029] The first light emitting diode 106 is a single-layer organic light emitting diode.

[0030] Among them, Figure 2 As shown, a single-layer organic light-emitting diode has only one OLED (Organic Light Emitting Diode) light-emitting layer, which may include an R (red light) light-emitting unit, a G (green light) light-emitting unit or a B (blue light) light-emitting unit. On this basis, Figure 2 and Figure 4 As shown, a conventional AMOLED light-emitting device can be obtained by evaporating a single layer of EL (Electroluminescent) units, namely, an R light-emitting unit, a G light-emitting unit and a B light-emitting unit, on a TFT (Thin Film Transistor) pixel circuit.

[0031] Furthermore, the second light emitting diode 108 is a series-connected organic light emitting diode.

[0032] Among them, Figure 3 As shown, the tandem organic light emitting diode includes a double-layer OLED light emitting layer, each of which may include an R (red light) light emitting unit, a G (green light) light emitting unit, or a B (blue light) light emitting unit. Compared with a single-layer organic light emitting diode, the tandem organic light emitting diode has a longer life, brighter light emitting brightness, and lower power consumption. Specifically, as Figure 3 As shown in FIG. 1 , in a tandem organic light-emitting diode, two single-layer OLED light-emitting layers are stacked in series via a CGL (Charge Generation Layer). On this basis, an AMOLED light-emitting device with a double-layer OLED light-emitting layer can be obtained by evaporating a tandem double-layer OLED light-emitting layer on a TFT pixel circuit.

[0033] On this basis, the display light-emitting device 100 provided in the embodiment of the present application divides the pixel unit 102 into two parts: a single-layer organic light-emitting diode and a series-connected organic light-emitting diode.

[0034] For example, for the pixel unit 102 of red light, Figure 7 As shown, the single-layer organic light-emitting diode corresponding to the R light-emitting unit and the series organic light-emitting diode are evaporated on the TFT pixel circuit respectively, and then packaged through the packaging layer. In the series organic light-emitting diode, two R light-emitting units are stacked in series through CGL.

[0035] Furthermore, the display light emitting device 100 provided in the embodiment of the present application can operate in a first light emitting mode or a second light emitting mode, wherein the light emitting brightness in the first light emitting mode is higher than the light emitting brightness in the second light emitting mode.

[0036] Further, when the display light-emitting device 100 operates in the first light-emitting mode, each pixel driving circuit 104 in the display light-emitting device 100 controls the first light-emitting diode 106 and the second light-emitting diode 108 in the corresponding pixel unit 102 to be turned on. At this time, the first light-emitting diode 106 and the second light-emitting diode 108 emit light together, and the power consumption is also low while meeting the high brightness requirement of the first light-emitting mode. When the display light-emitting device 100 operates in the second light-emitting mode, each pixel driving circuit 104 in the display light-emitting device 100 controls the first light-emitting diode 106 in the corresponding pixel unit 102 to be turned on, and controls the second light-emitting diode 108 in the corresponding pixel unit 102 to be turned off. At this time, only the first light-emitting diode 106 emits light, and while meeting the low brightness requirement of the second light-emitting mode, the color cast and Mura problems of the series-connected organic light-emitting diode in the low brightness light-emitting mode can be avoided, thereby improving the display effect of the display light-emitting device 100 in the low brightness light-emitting mode.

[0037] It is understandable that in low-brightness light-emitting mode, that is, when the OLED operates at low current, the efficiency and turn-on voltage of different light-emitting units vary greatly. Specifically, the efficiency of green light-emitting units and red light-emitting units is higher than that of blue light-emitting units, and the turn-on voltage is lower. Therefore, in low-brightness light-emitting mode, the current of the pixels corresponding to different light-emitting units needs to be very accurately regulated to avoid display color cast. Further, by I ds =(μ×W×(V dd -V data ) 2 ×Cox) / (2×L), we can know that the driving current of TFT is I ds The electron mobility μ, the ratio of the channel length L to the channel width W, the unit area capacitance Cox, and the gate voltage V data And the source voltage V dd The electron mobility μ is easily affected by factors such as temperature, humidity and process consistency and drifts, which leads to screen Mura and color cast problems in low-brightness light-emitting mode. Furthermore, the Tandem OLED device has two light-emitting layers inside, and the current required to emit the same brightness is only about half of that of the conventional Single OLED. Therefore, in low-brightness light-emitting mode, it is more difficult to control the current of different corresponding pixels of the Tandem OLED. The display light-emitting device 100 using the Tandem OLED is more likely to have color cast and Mura problems in low-brightness light-emitting mode, which reduces the display effect of the display light-emitting device 100 in low-brightness light-emitting mode.

[0038] Therefore, in the display light-emitting device 100 provided in the embodiment of the present application, the pixel unit 102 is divided into two parts: a single-layer organic light-emitting diode and a series-connected organic light-emitting diode. In the high-brightness light-emitting mode, a single-layer organic light-emitting diode and a series-connected organic light-emitting diode are used simultaneously for light-emitting display, so as to reduce power consumption while meeting the high-brightness requirement. In the low-brightness light-emitting mode, only a single-layer organic light-emitting diode is used for light-emitting display, so as to meet the low-brightness requirement while avoiding the color cast and Mura problems caused by the series-connected organic light-emitting diode in the low-brightness light-emitting mode, thereby improving the display effect of the display light-emitting device 100 in the low-brightness light-emitting mode.

[0039] According to the display light-emitting device 100 of the embodiment of the present application, it includes a plurality of pixel units 102 and a plurality of pixel driving circuits 104. Among them, the plurality of pixel driving circuits 104 are respectively connected to the plurality of pixel units 102 in a one-to-one correspondence. Further, each pixel unit 102 includes a first light-emitting diode 106 and a second light-emitting diode 108, the first light-emitting diode 106 is a single-layer organic light-emitting diode, and the second light-emitting diode 108 is a series organic light-emitting diode. Further, in the first light-emitting mode, each pixel driving circuit 104 is used to control the first light-emitting diode 106 and the second light-emitting diode 108 in the corresponding pixel unit 102 to be turned on, and in the second light-emitting mode, each pixel driving circuit 104 is used to control the first light-emitting diode 106 in the corresponding pixel unit 102 to be turned on, and control the second light-emitting diode 108 to be turned off. Through the above-mentioned display light-emitting device 100, the pixel unit 102 is divided into two parts: a single-layer organic light-emitting diode and a series-connected organic light-emitting diode. In the first light-emitting mode with higher light-emitting brightness, the single-layer organic light-emitting diode and the series-connected organic light-emitting diode are used simultaneously for light-emitting display, and in the second light-emitting mode with lower light-emitting brightness, only the single-layer organic light-emitting diode is used for light-emitting display. In this way, the display light-emitting device 100 can switch the working mode of the pixel unit 102 based on the requirements for light-emitting brightness in different light-emitting modes, and can improve the display effect of the display light-emitting device 100 in the low-brightness light-emitting mode while meeting the requirements of the display light-emitting device 100 for high brightness and low power consumption in the high-brightness light-emitting mode.

[0040] According to some embodiments of the present application, optionally, Figure 1 As shown, the pixel driving circuit 104 includes a first switch group 110 and a second switch group 114 .

[0041] One end of the first switch group 110 is connected to the first power supply 112, and the other end of the first switch group 110 is connected to the anode of the first light-emitting diode 106. The first switch group 110 is used to control the switch of the first light-emitting diode 106. When the first switch group 110 is turned on, the first light-emitting diode 106 is turned on, and when the first switch group 110 is turned off, the first light-emitting diode 106 is turned off.

[0042] Furthermore, a first end of the second switch group 114 is connected to the first light emitting diode 106, and a second end of the second switch group 114 is connected to the second light emitting diode 108. The second switch group 114 is used to control the switch of the second light emitting diode 108. When the first switch group 110 and the second switch group 114 are both turned on, the second light emitting diode 108 is turned on, and when the second switch group 114 is turned off, the second light emitting diode 108 is turned off.

[0043] Among them, the first power supply 112 is the positive power supply of the first light-emitting diode 106 and the second light-emitting diode 108, the cathode of the first light-emitting diode 106 can also be connected to the fourth power supply 150, and the cathode of the second light-emitting diode 108 can also be connected to the fifth power supply 152, the fourth power supply 150 is the negative power supply of the first light-emitting diode 106, and the fifth power supply 152 is the negative power supply of the second light-emitting diode 108.

[0044] During the operation of the display light-emitting device 100, when the display light-emitting device 100 operates in the first light-emitting mode, the first switch group 110 and the second switch group 114 are both turned on to turn on the first light-emitting diode 106 and the second light-emitting diode 108. At this time, the first light-emitting diode 106 and the second light-emitting diode 108 emit light together, and the power consumption is also low while meeting the high brightness requirement of the first light-emitting mode. When the display light-emitting device 100 operates in the second light-emitting mode, the first switch group 110 is turned on, and the second switch group 114 is turned off to turn on the first light-emitting diode 106 and turn off the second light-emitting diode 108. At this time, only the first light-emitting diode 106 emits light, and while meeting the low brightness requirement of the second light-emitting mode, the color cast and Mura problems of the series-connected organic light-emitting diode in the low brightness light-emitting mode can be avoided, thereby improving the display effect of the display light-emitting device 100 in the low brightness light-emitting mode.

[0045] According to the display light-emitting device 100 of the embodiment of the present application, the pixel driving circuit 104 includes a first switch group 110 and a second switch group 114. The first switch group 110 is connected to the first power supply 112 and the first light-emitting diode 106; the second switch group 114 is connected to the first light-emitting diode 106 and the second light-emitting diode 108. Further, in the first light-emitting mode, the first switch group 110 and the second switch group 114 are both turned on to turn on the first light-emitting diode 106 and the second light-emitting diode 108. In the second light-emitting mode, the first switch group 110 is turned on and the second switch group 114 is turned off to turn on the first light-emitting diode 106 and turn off the second light-emitting diode 108. In this way, based on the requirements for light-emitting brightness in different light-emitting modes, the switching of the working mode of the pixel unit 102 is realized by controlling the switch of the light-emitting diode, so that the display effect of the display light-emitting device 100 in the low-brightness light-emitting mode can be improved while meeting the requirements for high brightness and low power consumption of the display light-emitting device 100 in the high-brightness light-emitting mode.

[0046] According to some embodiments of the present application, optionally, Figure 1 As shown, the first switch group 110 includes a first transistor 116 , a second transistor 120 , and a third transistor 122 .

[0047] The first end of the first transistor 116 is connected to the first power source 112 , and the control end of the first transistor 116 is connected to the first signal port 118 .

[0048] Further, a first terminal of the second transistor 120 is connected to a second terminal of the first transistor 116 .

[0049] Further, a first end of the third transistor 122 is connected to the second end of the second transistor 120 , a second end of the third transistor 122 is connected to the anode of the first light emitting diode 106 , and a control end of the third transistor 122 is connected to the first signal port 118 .

[0050] Furthermore, the first signal port 118 is used to provide a switch signal EM[n] of the first light emitting diode 106. When the first signal port 118 outputs a low level, the first transistor 116 and the third transistor 122 are turned on, and when the first signal port 118 outputs a high level, the first transistor 116 and the third transistor 122 are turned off.

[0051] According to the display light-emitting device 100 of the embodiment of the present application, the first switch group 110 includes a first transistor 116, a second transistor 120 and a third transistor 122. Among them, the first end of the first transistor 116 is connected to the first power supply 112, and the control end of the first transistor 116 is connected to the first signal port 118; the first end of the second transistor 120 is connected to the second end of the first transistor 116; the first end of the third transistor 122 is connected to the second end of the second transistor 120, the second end of the third transistor 122 is connected to the anode of the first light-emitting diode 106, and the control end of the third transistor 122 is connected to the first signal port 118. In the case where the first signal port 118 outputs a low level, the first transistor 116 and the third transistor 122 are turned on, and in the case where the first signal port 118 outputs a high level, the first transistor 116 and the third transistor 122 are turned off. In this way, it is convenient to control the first switch group 110 to be turned on or off by outputting a high or low level from the first signal port 118, thereby controlling the working state of the first light-emitting diode 106.

[0052] According to some embodiments of the present application, optionally, Figure 1 As shown, the second switch group 114 includes a fourth transistor 124 .

[0053] A first terminal of the fourth transistor 124 is connected to the anode of the second light emitting diode 108 , a second terminal of the fourth transistor 124 is connected to the anode of the first light emitting diode 106 , and a control terminal of the fourth transistor 124 is connected to the second signal port 126 .

[0054] Further, the second signal port 126 is used to provide a switch signal EM[n+1] of the second light-emitting diode 108. When the second signal port 126 outputs a low level, the fourth transistor 124 is turned on. At this time, if the first switch group 110 is also in the on state, the second light-emitting diode 108 is turned on. When the second signal port 126 outputs a high level, the fourth transistor 124 is turned off. At this time, the second light-emitting diode 108 is turned off. In this way, a control unit of a series organic light-emitting diode is added to the display light-emitting device 100, and the fourth transistor 124 is controlled to be turned off or on by outputting a high or low level at the second signal port 126, so that the working state of the series organic light-emitting diode, i.e., the second light-emitting diode 108, can be controlled, thereby realizing the switching of the working mode of the pixel unit 102.

[0055] Specifically, in the display light-emitting device 100 provided in the embodiment of the present application, when the display light-emitting device 100 operates in the first light-emitting mode, the first transistor 116, the second transistor 120, the third transistor 122 and the fourth transistor 124 are all turned on. At this time, the first light-emitting diode 106 and the second light-emitting diode 108 are both turned on to emit light through the first light-emitting diode 106 and the second light-emitting diode 108 together, while meeting the high brightness requirement of the first light-emitting mode, the power consumption is also low. When the display light-emitting device 100 operates in the second light-emitting mode, the first transistor 116, the second transistor 120 and the third transistor 122 are all turned on, and the fourth transistor 124 is turned off. At this time, the first light-emitting diode 106 is turned on, the second light-emitting diode 108 is turned off, and light is emitted only through the first light-emitting diode 106. While meeting the low brightness requirement of the second light-emitting mode, the color cast and Mura problems of the series-connected organic light-emitting diode in the low brightness light-emitting mode can be avoided, and the display effect of the display light-emitting device 100 in the low brightness light-emitting mode is improved.

[0056] According to the display light-emitting device 100 of the embodiment of the present application, the second switch group 114 includes a fourth transistor 124, the first end of the fourth transistor 124 is connected to the anode of the second light-emitting diode 108, the second end of the fourth transistor 124 is connected to the anode of the first light-emitting diode 106, and the control end of the fourth transistor 124 is connected to the second signal port 126; wherein, when the second signal port 126 outputs a low level, the fourth transistor 124 is turned on, and when the second signal port 126 outputs a high level, the fourth transistor 124 is turned off. In this way, a control unit of the series-connected organic light-emitting diode is added to the display light-emitting device 100, so as to realize the switching of the working mode of the pixel unit 102 by controlling the working state of the series-connected organic light-emitting diode.

[0057] According to some embodiments of the present application, optionally, Figure 1 As shown, the pixel driving circuit 104 further includes a capacitor 128 and a fifth transistor 130 .

[0058] The first end of the capacitor 128 is connected to the first power source 112, and the second end of the capacitor 128 is connected to the control end of the second transistor 120. The capacitor 128 can store voltage data.

[0059] Furthermore, a first end of the fifth transistor 130 is connected to the second end of the capacitor 128 , a second end of the fifth transistor 130 is connected to the second power source 132 , and a control end of the fifth transistor 130 is connected to the third signal port 134 .

[0060] The second power source 132 is used to provide an initialization potential Vint1 for the capacitor element 128 .

[0061] Furthermore, the third signal port 134 is used to provide a gate switch signal Scan[n-1] of the fifth transistor 130. When the third signal port 134 outputs a low level, the fifth transistor 130 is turned on, and when the third signal port 134 outputs a high level, the fifth transistor 130 is turned off.

[0062] Specifically, during the operation of the display light emitting device 100 provided in the embodiment of the present application, Figure 8 As shown, within one frame time of display refresh, the driving timing process of the display light emitting device 100 can be divided into four stages: T1, T2, T3 and T4. In the T1 stage, the gate switch signal Scan[n-1] of the fifth transistor 130 output by the third signal port 134 is at a low level, the fifth transistor 130 is turned on, and the negative voltage Vint1 of the second power supply 132 is written to the gate of the second transistor 120 and stored in the capacitor element 128 for retention.

[0063] According to the display light-emitting device 100 of the embodiment of the present application, the pixel driving circuit 104 also includes a capacitor 128 and a fifth transistor 130. Among them, the first end of the capacitor 128 is connected to the first power supply 112, and the second end of the capacitor 128 is connected to the control end of the second transistor 120; the first end of the fifth transistor 130 is connected to the second end of the capacitor 128, the second end of the fifth transistor 130 is connected to the second power supply 132 (Vint1), and the control end of the fifth transistor 130 is connected to the third signal port 134 (Scan [n-1]). Further, when the third signal port 134 outputs a low level, the fifth transistor 130 is turned on, and when the third signal port 134 outputs a high level, the fifth transistor 130 is turned off. In this way, the negative voltage of the second power supply 132 can be stored and maintained by the capacitor 128, so as to provide a turn-on voltage for the second transistor 120 in the subsequent driving process.

[0064] According to some embodiments of the present application, optionally, Figure 1 As shown, the pixel driving circuit 104 further includes a sixth transistor 136 and a seventh transistor 142 .

[0065] The first end of the sixth transistor 136 is connected to the fourth signal port 138 , the second end of the sixth transistor 136 is connected to the second end of the first transistor 116 , and the control end of the sixth transistor 136 is connected to the fifth signal port 140 .

[0066] Further, a first end of the seventh transistor 142 is connected to the second end of the capacitor 128 , a second end of the seventh transistor 142 is connected to the second end of the second transistor 120 , and a control end of the seventh transistor 142 is connected to the fifth signal port 140 .

[0067] The fourth signal port 138 is used to display intelligence data, and can provide a voltage data signal V DATA .

[0068] Further, the fifth signal port 140 is used to provide a gate switch signal Scan[n] of the sixth transistor 136 and the seventh transistor 142. When the fifth signal port 140 outputs a low level, the sixth transistor 136 and the seventh transistor 142 are turned on, and when the fifth signal port 140 outputs a high level, the sixth transistor 136 and the seventh transistor 142 are turned off.

[0069] Specifically, during the operation of the display light emitting device 100 provided in the embodiment of the present application, Figure 8 As shown, in the T2 stage, the gate switch signal Scan[n] of the sixth transistor 136 and the seventh transistor 142 outputted by the fifth signal port 140 is at a low level, and the sixth transistor 136 and the seventh transistor 142 are both turned on. At the same time, the second transistor 120 is still in the turned-on state under the maintenance of the negative voltage Vint1 stored in the capacitor element 128 in the T1 stage. At this time, the voltage data signal V outputted by the fourth signal port 138 is DATA The gate voltage V of the second transistor 120 is transmitted along the sixth transistor 136, the second transistor 120 and the seventh transistor 142, and is finally stored in the capacitor 128. g =V DATA -V th , where V th is the threshold voltage of the second transistor 120. In this way, the threshold voltage of the second transistor 120 is extracted, which provides a prerequisite for the subsequent optimization of the threshold voltage of the second transistor 120.

[0070] According to the display light-emitting device 100 of the embodiment of the present application, the pixel driving circuit 104 also includes a sixth transistor 136 and a seventh transistor 142. Among them, the first end of the sixth transistor 136 is connected to the fourth signal port 138, the second end of the sixth transistor 136 is connected to the second end of the first transistor 116, and the control end of the sixth transistor 136 is connected to the fifth signal port 140; the first end of the seventh transistor 142 is connected to the second end of the capacitor 128, the second end of the seventh transistor 142 is connected to the second end of the second transistor 120, and the control end of the seventh transistor 142 is connected to the fifth signal port 140; when the fifth signal port 140 outputs a low level, the sixth transistor 136 and the seventh transistor 142 are turned on, and when the fifth signal port 140 outputs a high level, the sixth transistor 136 and the seventh transistor 142 are turned off. In this way, it is convenient to extract the threshold voltage of the second transistor 120, thereby providing a prerequisite for the subsequent optimization of the threshold voltage of the second transistor 120.

[0071] According to some embodiments of the present application, optionally, Figure 1 As shown, the pixel driving circuit 104 further includes an eighth transistor 144 .

[0072] The first end of the eighth transistor 144 is connected to the anode of the second light emitting diode 108 , the second end of the eighth transistor 144 is connected to the third power source 146 , and the control end of the eighth transistor 144 is connected to the sixth signal port 148 .

[0073] Furthermore, the third power supply 146 is used to provide an anode initialization potential Vint2 for the first light emitting diode 106 and the second light emitting diode 108 .

[0074] Furthermore, the sixth signal port 148 is used to provide a gate switch signal Scan[n+1] of the eighth transistor 144. When the sixth signal port 148 outputs a low level, the eighth transistor 144 is turned on, and when the sixth signal port 148 outputs a high level, the eighth transistor 144 is turned off.

[0075] Specifically, during the operation of the display light emitting device 100 provided in the embodiment of the present application, Figure 8 As shown, in the T3 stage, the gate switch signal Scan[n+1] of the eighth transistor 144 output by the sixth signal port 148 is at a low level, the eighth transistor 144 is turned on, and the negative voltage Vint2 of the third power supply 146 is written to the anodes of the first light-emitting diode 106 and the second light-emitting diode 108 to charge and reset the first light-emitting diode 106 and the second light-emitting diode 108, thereby releasing the residual charge accumulated in the first light-emitting diode 106 and the second light-emitting diode 108.

[0076] On this basis, in the T4 stage, when the light-emitting device 100 is shown to be operating in the first light-emitting mode, the gate switch signals Scan[n-1], Scan[n] and Scan[n+1] are all high, the sixth transistor 136, the seventh transistor 142, the fifth transistor 130 and the eighth transistor 144 are turned off, and the switch signals EM[n] and EM[n+1] are both low, and the first transistor 116, the third transistor 122 and the fourth transistor 124 are all turned on. At the same time, the voltage (V DATA -V th ), the current of the first power supply 112 flows through the first transistor 116, the second transistor 120, the third transistor 122 and the fourth transistor 124, and flows to the first light-emitting diode 106 and the second light-emitting diode 108, so that the first light-emitting diode 106 and the second light-emitting diode 108 both emit light.

[0077] When the display light emitting device 100 is operating in the second light emitting mode, the gate switch signals Scan[n-1], Scan[n], Scan[n+1] and the switch signal EM[n] are all at low levels, and the switch signal EM[n+1] is at a high level. At this time, the fourth transistor 124 is turned off, and the current of the first power supply 112 flows through the first transistor 116, the second transistor 120 and the third transistor 122, and flows to the first light emitting diode 106, so that only the first light emitting diode 106 emits light.

[0078] According to the display light-emitting device 100 of the embodiment of the present application, the pixel driving circuit 104 further includes an eighth transistor 144. The first end of the eighth transistor 144 is connected to the anode of the second light-emitting diode 108, the second end of the eighth transistor 144 is connected to the third power supply 146, and the control end of the eighth transistor 144 is connected to the sixth signal port 148; when the sixth signal port 148 outputs a low level, the eighth transistor 144 is turned on, and when the sixth signal port 148 outputs a high level, the eighth transistor 144 is turned off. In this way, it is convenient to charge and reset the first light-emitting diode 106 and the second light-emitting diode 108, thereby releasing the residual charge accumulated in the first light-emitting diode 106 and the second light-emitting diode 108.

[0079] According to some embodiments of the present application, optionally, the area of ​​the first light emitting diode 106 in each pixel unit 102 is smaller than the area of ​​the second light emitting diode 108 .

[0080] Specifically, when the display light emitting device 100 operates in the second light emitting mode with lower light emitting brightness, light is emitted only through the first light emitting diode 106, and the first light emitting diode 106 has a lower requirement for the aperture ratio. At this time, by limiting the area of ​​the first light emitting diode 106 in each pixel unit 102 to be smaller than the area of ​​the second light emitting diode 108, the occupied area of ​​the pixel unit 102 can be saved while ensuring the display effect of the display light emitting device 100.

[0081] Among them, Figure 5 As shown, for each pixel unit 102, the first light emitting diode 106 may be disposed in the central area of ​​the second light emitting diode 108. Alternatively, as shown in FIG. Figure 6 As shown, the first light emitting diode 106 can be arranged at the edge area of ​​the second light emitting diode 108. In actual application, those skilled in the art can arrange the first light emitting diode 106 and the second light emitting diode 108 according to actual conditions, and no specific limitation is made here.

[0082] According to the display light emitting device 100 of the embodiment of the present application, the area of ​​the first light emitting diode 106 in each pixel unit 102 is smaller than the area of ​​the second light emitting diode 108. In this way, the occupied area of ​​the pixel unit 102 can be saved while ensuring the display effect of the display light emitting device 100.

[0083] According to some embodiments of the present application, optionally, Fig. 9 As shown, the embodiment of the present application further provides a display screen 200. The display screen 200 includes the display light emitting device 100 in any of the above embodiments. The display screen 200 provided in the embodiment of the present application includes the display light emitting device 100 in any of the above embodiments, and can achieve the same technical effect. To avoid repetition, it will not be described here.

[0084] In actual application, the above-mentioned display screen 200 includes but is not limited to: a screen based on a 7T1C (7 TFT devices + 1 display device) circuit, an LTPS (Low Temperature Poly-silicon) screen, a screen based on an 8T1C (8 TFT devices + 1 display device) circuit and an LTPO (Low Temperature Polycrystalline Oxide) screen, etc., and no specific restrictions are made here.

[0085] According to some embodiments of the present application, optionally, Fig.10As shown, the embodiment of the present application further provides an electronic device 300. The electronic device 300 includes a main body 302 and the display screen 200 in the above embodiment. The electronic device 300 provided in the embodiment of the present application includes the display screen 200 in the above embodiment, and can achieve the same technical effect. To avoid repetition, it will not be described here.

[0086] It should be noted that the electronic device 300 in the embodiment of the present application includes a mobile electronic device and a non-mobile electronic device.

[0087] In the actual application process, the electronic device 300 can be a terminal or other devices other than a terminal. For example, the electronic device 300 can be a mobile phone, a tablet computer, a laptop computer, a PDA, a vehicle-mounted electronic device, a mobile Internet device (MID), an augmented reality (AR) / virtual reality (VR) device, a robot, a wearable device, an ultra-mobile personal computer (UMPC), a netbook or a personal digital assistant (PDA), etc. It can also be a server, a network attached storage (NAS), a personal computer (PC), a television (TV), a teller machine or a self-service machine, etc., and the embodiments of the present application are not specifically limited.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0089] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A display light emitting device, characterized in that: include: A plurality of pixel units, each of the pixel units comprises a first light emitting diode and a second light emitting diode, the first light emitting diode is a single-layer organic light emitting diode, and the second light emitting diode is a series-connected organic light emitting diode; A plurality of pixel driving circuits are connected to the plurality of pixel units in a one-to-one correspondence; In the first light-emitting mode, each of the pixel driving circuits is used to control the first light-emitting diode and the second light-emitting diode in the corresponding pixel unit to be turned on. In the second light-emitting mode, each of the pixel driving circuits is used to control the first light-emitting diode in the corresponding pixel unit to be turned on, and control the second light-emitting diode to be turned off.

2. The display light emitting device according to claim 1, characterized in that: The pixel driving circuit comprises: A first switch group is connected to the first power source and the first light emitting diode; A second switch group is connected to both the first light emitting diode and the second light emitting diode; Among them, in the first light-emitting mode, the first switch group and the second switch group are both turned on to turn on the first light-emitting diode and the second light-emitting diode. In the second light-emitting mode, the first switch group is turned on and the second switch group is turned off to turn on the first light-emitting diode and turn off the second light-emitting diode.

3. The display light emitting device according to claim 2, characterized in that: The first switch group includes: a first transistor, wherein a first terminal of the first transistor is connected to the first power supply, and a control terminal of the first transistor is connected to a first signal port; a second transistor, a first terminal of the second transistor being connected to a second terminal of the first transistor; a third transistor, wherein a first end of the third transistor is connected to the second end of the second transistor, a second end of the third transistor is connected to the anode of the first light-emitting diode, and a control end of the third transistor is connected to the first signal port; Wherein, when the first signal port outputs a low level, the first transistor and the third transistor are turned on, and when the first signal port outputs a high level, the first transistor and the third transistor are turned off.

4. The display light emitting device according to claim 3, characterized in that: The second switch group includes: a fourth transistor, wherein a first end of the fourth transistor is connected to the anode of the second light-emitting diode, a second end of the fourth transistor is connected to the anode of the first light-emitting diode, and a control end of the fourth transistor is connected to the second signal port; Wherein, when the second signal port outputs a low level, the fourth transistor is turned on, and when the second signal port outputs a high level, the fourth transistor is turned off.

5. The display light emitting device according to claim 3, characterized in that: The pixel driving circuit further includes: a capacitor element, wherein a first end of the capacitor element is connected to the first power source, and a second end of the capacitor element is connected to the control end of the second transistor; a fifth transistor, wherein a first end of the fifth transistor is connected to the second end of the capacitor, a second end of the fifth transistor is connected to a second power supply, and a control end of the fifth transistor is connected to a third signal port; Wherein, when the third signal port outputs a low level, the fifth transistor is turned on, and when the third signal port outputs a high level, the fifth transistor is turned off.

6. The display light emitting device according to claim 5, characterized in that: The pixel driving circuit further includes: a sixth transistor, wherein a first end of the sixth transistor is connected to the fourth signal port, a second end of the sixth transistor is connected to the second end of the first transistor, and a control end of the sixth transistor is connected to the fifth signal port; a seventh transistor, wherein a first end of the seventh transistor is connected to the second end of the capacitor, a second end of the seventh transistor is connected to the second end of the second transistor, and a control end of the seventh transistor is connected to the fifth signal port; Wherein, when the fifth signal port outputs a low level, the sixth transistor and the seventh transistor are turned on, and when the fifth signal port outputs a high level, the sixth transistor and the seventh transistor are turned off.

7. The display light emitting device according to any one of claims 1 to 6, characterized in that: The pixel driving circuit further includes: an eighth transistor, wherein a first end of the eighth transistor is connected to the anode of the second light-emitting diode, a second end of the eighth transistor is connected to the third power supply, and a control end of the eighth transistor is connected to the sixth signal port; Wherein, when the sixth signal port outputs a low level, the eighth transistor is turned on, and when the sixth signal port outputs a high level, the eighth transistor is turned off.

8. The display light emitting device according to any one of claims 1 to 6, characterized in that: The area of ​​the first light emitting diode in each of the pixel units is smaller than the area of ​​the second light emitting diode.

9. A display screen, characterized in that: include: A display light emitting device as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: include: main body; A display screen as claimed in claim 9.

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