Light-emitting device and display module

Abstract

The invention relates to the technical field of display, and discloses a light-emitting device and a display module, and the light-emitting device comprises a first electrode layer, a first light-emitting function layer, a second electrode layer, a second light-emitting function layer and a third electrode layer, the control module is used for providing a preset voltage signal for one of the first electrode layer, the second electrode layer and the third electrode layer and providing a first control signal and a second control signal for the other two electrode layers respectively so as to control the luminance of at least one of the first light-emitting functional layer and the second light-emitting functional layer. Since the first electrode layer, the first light-emitting functional layer, the second electrode layer, the second light-emitting functional layer and the third electrode layer are sequentially laminated, the light-emitting functional layers are overlapped in the vertical direction, and the light-emitting brightness of the two light-emitting functional layers overlapped in the vertical direction is respectively controlled through the three electrode layers. Therefore, the color temperature of the light-emitting device is adjusted.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a light-emitting device and a display module. Background Art

[0002] Currently, Organic Light-Emitting Diode (OLED) has gradually gained market favor in the fields of lighting, medical beauty, etc. due to its own advantages such as no glare and soft light perception. However, the color temperature of OLED surface light sources cannot be adjusted, which limits its application scenarios. Summary of the invention

[0003] The present application proposes a light-emitting device and a display module, which can adjust the color temperature of an OLED surface light source.

[0004] In a first aspect, the present application provides a light-emitting device, comprising: a light-emitting device and a control module;

[0005] The light emitting device comprises a first electrode layer, a first light emitting functional layer, a second electrode layer, a second light emitting functional layer and a third electrode layer which are stacked in sequence;

[0006] The control module is used to provide a preset voltage signal to one of the first electrode layer, the second electrode layer and the third electrode layer, and to provide a first control signal and a second control signal to the other two, respectively, so as to control the luminous brightness of at least one of the first light-emitting functional layer and the second light-emitting functional layer.

[0007] In some embodiments, the preset voltage signal is provided to the second electrode layer, the first control signal is provided to the first electrode layer, and the second control signal is provided to the third electrode layer.

[0008] In some embodiments, in one light emitting period, the preset voltage signal is provided to the second electrode layer, the first control signal is provided to the first electrode layer, and the second control signal is provided to the third electrode layer.

[0009] In some embodiments, the first control signal is configured as one of the following:

[0010] a constant first voltage, wherein the first voltage is different from a voltage of the preset voltage signal;

[0011] a first pulse width modulated signal;

[0012] The voltage of the preset voltage signal.

[0013] In some embodiments, the first pulse width modulation signal includes voltages of the first voltage and the preset voltage signal that alternate with each other.

[0014] In some embodiments, the second control signal is configured as one of the following:

[0015] a constant second voltage, wherein the second voltage is different from a voltage of the preset voltage signal;

[0016] a second pulse width modulated signal;

[0017] The voltage of the preset voltage signal.

[0018] In some embodiments, the second pulse width modulation signal includes the second voltage and the preset voltage signal which alternate with each other.

[0019] In some embodiments, the light emitting device is controlled to periodically perform a light emitting phase, and the light emitting phase includes at least two different light emitting cycles.

[0020] In some embodiments, the first control signal is configured as a first pulse width modulation signal, the first pulse width modulation signal includes the first voltage and the voltage of the preset voltage signal alternating with each other; the second control signal is configured as a second pulse width modulation signal, the second pulse width modulation signal includes the second voltage and the voltage of the preset voltage signal alternating with each other;

[0021] A first voltage in the first control signal corresponds to a second voltage in the second control signal.

[0022] In some embodiments, the first control signal is configured as a first pulse width modulation signal, the first pulse width modulation signal includes the first voltage and the voltage of the preset voltage signal alternating with each other; the second control signal is configured as a second pulse width modulation signal, the second pulse width modulation signal includes the second voltage and the voltage of the preset voltage signal alternating with each other;

[0023] The period of the first voltage in the first control signal is within the period of the preset voltage signal in the second control signal; the period of the second voltage in the second control signal is within the period of the preset voltage signal in the first control signal.

[0024] In some embodiments, the first light-emitting functional layer emits a first color light; the second light-emitting functional layer emits a second color light; and the first color is different from the second color.

[0025] In some embodiments, the first color light is one of red, yellow, green and blue; the second color light is another of red, yellow, green and blue.

[0026] In some embodiments, the second electrode layer is a light-transmitting film layer, and at least one of the first electrode layer and the third electrode layer is a light-transmitting film layer.

[0027] In a second aspect, the present application further provides a display module, comprising a light-emitting device as described in any one of the first aspects.

[0028] The advantage of the present application is that since the first electrode layer, the first light-emitting functional layer, the second electrode layer, the second light-emitting functional layer and the third electrode layer are stacked in sequence, the light-emitting functional layers overlap in the vertical direction, and the luminous brightness of the two light-emitting functional layers overlapping in the vertical direction are controlled respectively by the three electrode layers, thereby adjusting the color temperature of the light-emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0030] Figure 1 is a schematic diagram of a light-emitting device provided by the present application;

[0031] Figure 2 is a schematic diagram of another light-emitting device provided by the present application;

[0032] Figure 3 It is a schematic diagram of the timing of a light-emitting period T1 of a light-emitting device provided by the present application;

[0033] Figure 4 It is a schematic diagram of the timing of a light-emitting period T1' of a light-emitting device provided by the present application;

[0034] Figure 5 It is a schematic diagram of the timing of a light-emitting period T2 of a light-emitting device provided by the present application;

[0035] Figure 6 It is a schematic diagram of the timing of a light-emitting period T2' of a light-emitting device provided by the present application;

[0036] Figure 7 It is a schematic diagram of the timing of a light-emitting period TA of a light-emitting device provided by the present application;

[0037] Figure 8 It is a schematic diagram of the timing of a light-emitting period TB of a light-emitting device provided by the present application;

[0038] Fig. 9It is a schematic diagram of the timing of multiple light-emitting cycles of a light-emitting device provided by the present application;

[0039] Fig.10 It is a schematic diagram of the timing of a light-emitting cycle TC of a light-emitting device provided by the present application;

[0040] Fig.11 It is a schematic diagram of the timing of a light-emitting period TD of a light-emitting device provided by the present application;

[0041] Fig.12 It is a schematic diagram of the timing of multiple light-emitting cycles of another light-emitting device provided in the present application. DETAILED DESCRIPTION

[0042] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should be the common meanings understood by those skilled in the art to which this application belongs.

[0043] Embodiment 1

[0044] like Figure 1 , which is a schematic diagram of a light-emitting device provided in an embodiment of the present application, and the light-emitting device includes: a light-emitting device and a control module. The light-emitting device includes a first electrode layer 110, a first light-emitting functional layer 210, a second electrode layer 120, a second light-emitting functional layer 220 and a third electrode layer 130 stacked in sequence. The control module is used to provide a preset voltage signal to one of the first electrode layer 110, the second electrode layer 120 and the third electrode layer 130, and to provide a first control signal and a second control signal to the other two, respectively, to control the light-emitting brightness of at least one of the first light-emitting functional layer 210 and the second light-emitting functional layer 220, wherein.

[0045] Among them, Figure 2 As shown, the first electrode layer 110, the first light-emitting functional layer 210, the second electrode layer 120, the second light-emitting functional layer 220 and the third electrode layer 130 stacked in sequence may be arranged from top to bottom, or may be arranged as follows: Figure 1 As shown, from bottom to top, the first light-emitting functional layer 210 is between the first electrode layer 110 and the second electrode layer 120 , and the second light-emitting functional layer 220 is between the second electrode layer 120 and the third electrode layer 130 .

[0046] The luminous brightness of the first luminous functional layer 210 is determined by the voltage between the first electrode layer 110 and the second electrode layer 120, and the luminous brightness of the second luminous functional layer 220 is determined by the voltage between the second electrode layer 120 and the third electrode layer 130. By adjusting the voltage difference between the first control signal, the second control signal and the preset voltage signal, the luminous brightness of the first luminous functional layer and / or the second luminous functional layer can be adjusted. Since the first luminous functional layer and the second luminous functional layer overlap in the vertical direction, the luminous brightness of the luminous device can be adjusted, thereby realizing the regulation of the brightness and color temperature of the luminous device, which can meet the different needs of customers.

[0047] In one embodiment, a preset voltage signal is provided to the second electrode layer, a first control signal is provided to the first electrode layer, and a second control signal is provided to the third electrode layer.

[0048] When a voltage difference is generated between the first control signal and the preset voltage signal, the first light-emitting functional layer emits light, and its brightness is adjusted by the magnitude of the voltage difference and / or the light-emitting time. When a voltage difference is generated between the second control signal and the preset voltage signal, the second light-emitting functional layer emits light, and its brightness is adjusted by the magnitude of the voltage difference and / or the light-emitting time. By adjusting the voltage difference between the first electrode layer and the second electrode layer, the voltage difference between the second electrode layer and the third electrode layer, and the time of the voltage difference, the light-emitting brightness of the first light-emitting functional layer and the second light-emitting functional layer is changed, thereby adjusting the color temperature of the light-emitting device.

[0049] In one embodiment, the second electrode layer is a light-transmitting film layer, and at least one of the first electrode layer and the third electrode layer is a light-transmitting film layer.

[0050] Since OLED devices include top-emitting devices and bottom-emitting devices, one of the first electrode layer and the third electrode layer is determined to be a light-transmitting film layer based on the difference between top emission and bottom emission, so that light emitted by the first light-emitting functional layer and the second light-emitting functional layer can be emitted through the light-transmitting film layer.

[0051] refer to Figure 1 and Figure 2 If the light of the light-emitting device is emitted from the upper side, the light-emitting device is a top-emitting device; if the light of the light-emitting device is emitted from the lower side, the light-emitting device is a bottom-emitting device.

[0052] The preset voltage signal provided to the second electrode layer 120 may be a reference ground signal, the first electrode layer is one of the positive electrode (anode) and the negative electrode (cathode), and the third electrode layer is the other of the positive electrode and the negative electrode.

[0053] Among them, the materials of the positive electrode include: ITO (indium tin oxide) and the composition of ITO, Ag (silver), and ITO, such as (ITO-Ag-ITO thin film); the materials of the negative electrode include: Al (aluminum), IZO (indium zinc oxide), MgAg (compound of magnesium and silver), and the composition of MgAg and IZO; the materials of the second electrode layer include: MgAg, the composition of MgAg and IZO, Al, and IZO. Both the first light-emitting functional layer and the second light-emitting functional layer include an organic light-emitting layer.

[0054] In the case of top emission, the materials of the positive electrode include: the composition of ITO, Ag (silver), and ITO; the materials of the negative electrode include: IZO, Al, MgAg, and the composition of MgAg and IZO. In the case of bottom emission, the materials of the positive electrode include: ITO; the materials of the negative electrode include: Al.

[0055] In one embodiment, the first light-emitting functional layer emits light of a first color; the second light-emitting functional layer emits light of a second color; the first color is different from the second color.

[0056] In one embodiment, the light of the first color is one of red, yellow, green, and blue; the light of the second color is another one of red, yellow, green, and blue.

[0057] Since the first color and the second color and the first light-emitting functional layer and the second light-emitting functional layer overlap in the vertical direction, the color temperature of the light finally emitted by the light-emitting device can be achieved by changing the emission brightness of the first color and / or the second color.

[0058] In one embodiment, in one light-emitting cycle, a preset voltage signal is provided to the second electrode layer, a first control signal is provided to the first electrode layer, and a second control signal is provided to the third electrode layer.

[0059] The light-emitting cycle includes at least one. In the case of having multiple light-emitting cycles, the first control signal and the second control signal in each light-emitting cycle can be changed, so as to achieve more flexible color temperature adjustment.

[0060] In one embodiment, the first control signal is configured as one of the following: a constant first voltage V2, the first voltage V2 is different from the voltage V1 of the preset voltage signal S0; a first pulse width modulation signal (Pulse Width Modulation, PWM); the voltage V1 of the preset voltage signal S0. Among them, when the first electrode layer is used as the positive electrode, the value of the first voltage V2 is greater than the value of the voltage V1 of the preset voltage signal S0, and when the first electrode layer is used as the negative electrode, the first voltage V2 is less than the value of the voltage V1 of the preset voltage signal S0.

[0061] As Figure 3 As shown, it is a timing diagram in a case where the first control signal S1 is configured as a constant first voltage V2 and the second control signal S2 is configured as a voltage V1 of a preset voltage signal S0 in a light-emitting period T1, wherein the first electrode layer 110 is a positive electrode, the third electrode layer 130 is a negative electrode, and the voltage V1 of the preset voltage signal S0 is provided to the second electrode layer 120 as an example. In this light-emitting period, the first light-emitting functional layer 210 emits light, is always on, and the light-emitting brightness remains unchanged, and the second light-emitting functional layer 220 is not on.

[0062] In the T1 cycle stage, the first light-emitting functional layer 210 emits light. This time period (T1 cycle stage) is the time period of the highest brightness of the light-emitting device, and this timing can reduce the voltage drop pressure of the third electrode layer 130 .

[0063] In one embodiment, the first pulse width modulation signal includes a first voltage V2 and a voltage V1 of a preset voltage signal S0 that alternate with each other.

[0064] like Figure 4 As shown, it is a timing diagram in a case where the first control signal S1 is configured as a first pulse width modulation signal and the second control signal S2 is configured as a voltage V1 of a preset voltage signal S0 in a light-emitting period T1', wherein the first electrode layer 110 is a positive electrode, the third electrode layer 130 is a negative electrode, and the voltage V1 of the preset voltage signal S0 is provided to the second electrode layer 120 as an example. In this light-emitting period, the first light-emitting functional layer 210 emits light, and the light-emitting brightness of the first light-emitting functional layer 210 is adjusted by the first pulse width modulation signal, and the second light-emitting functional layer 220 is not lit.

[0065] In the T1' cycle stage, the luminous duty ratio of the first luminous functional layer 210 is adjusted, and the second luminous functional layer 220 does not emit light. By adjusting the luminous duty ratio of the first pulse width modulation signal, the luminous brightness of the first luminous functional layer 210 is controlled, thereby achieving an adjustable luminous brightness effect of the first luminous functional layer 210. By adjusting the timing, the T1' stage (T1' cycle stage) is set to a continuous cycle, and the luminous device has a monochromatic luminous effect.

[0066] In one embodiment, the second control signal S2 is configured as one of the following: a constant second voltage V3, the second voltage V3 is different from the voltage V1 of the preset voltage signal S0; a second pulse width modulation signal; a voltage V1 of the preset voltage signal S0. Wherein, when the second electrode layer 120 is used as a positive electrode, the value of the second voltage V3 is greater than the value of the voltage V1 of the preset voltage signal S0, and when the second electrode layer 120 is used as a negative electrode, the value of the second voltage V3 is less than the value of the voltage V1 of the preset voltage signal S0.

[0067] like Figure 5 As shown, it is a timing diagram in a case where the second control signal S2 is configured as a constant second voltage V3 and the first control signal S1 is configured as a voltage V1 of a preset voltage signal S0 in a light-emitting period T2, wherein the first electrode layer 110 is a positive electrode, the third electrode layer 130 is a negative electrode, and the voltage V1 of the preset voltage signal S0 is provided to the second electrode layer 120 as an example. In this light-emitting period, the second light-emitting functional layer 220 emits light, is always on, and the light-emitting brightness remains unchanged, and the first light-emitting functional layer 210 is not on.

[0068] During the T2 cycle stage, the second light-emitting functional layer 220 emits light. This time period (T2 cycle stage) is the time period of the highest brightness of the light-emitting device, and this timing can reduce the voltage drop pressure of the second electrode layer 120 .

[0069] By adjusting the timing, the T1 period and the T2 period are set as continuous periods, so that the first light-emitting functional layer 210 and the second light-emitting functional layer 220 emit light in time division, so that the light emitted by the first light-emitting functional layer 210 and the second light-emitting functional layer 220 can be mixed in color within the continuous period, so that the color temperature can be adjusted. With the first light-emitting functional layer 210 emitting red light and the second light-emitting functional layer 220 emitting yellow light, the light-emitting device can emit orange light after the color mixing is performed by controlling the T1 period and the T2 period to continuously cycle.

[0070] In one embodiment, the second pulse width modulation signal includes a second voltage V3 and a voltage V1 of the preset voltage signal S0 that alternate with each other.

[0071] like Figure 6 As shown, it is a timing diagram in a case where the second control signal S2 is configured as a second pulse width modulation signal and the first control signal S1 is configured as a voltage V1 of a preset voltage signal S0 in a light-emitting period T2', wherein the first electrode layer 110 is a positive electrode, the third electrode layer 130 is a negative electrode, and the voltage V1 of the preset voltage signal S0 is provided to the second electrode layer 120 as an example. In this light-emitting period, the second light-emitting functional layer 220 emits light, and the light-emitting brightness of the first light-emitting functional layer 210 is adjusted by the second pulse width modulation signal, and the first light-emitting functional layer 210 is not lit.

[0072] In the T2' cycle stage, the luminous duty ratio of the second luminous functional layer 220 is adjusted. At this time, the first luminous functional layer 210 does not emit light. By adjusting the luminous duty ratio of the second pulse width modulation signal, the luminous brightness of the second luminous functional layer 220 is controlled, thereby achieving an adjustable luminous brightness effect of the second luminous functional layer 220. By adjusting the timing, the T2' stage (T2' cycle stage) is set to a continuous cycle, and the luminous device has a monochromatic luminous effect.

[0073] By adjusting the timing, setting the T1' period and the T2' period as continuous periods, the light emitted by the first light-emitting functional layer 210 and the second light-emitting functional layer 220 can be controlled to have different color temperatures and different luminous brightness. Since the control timing of the T1' period and the T2' period is time-sharing control for the first light-emitting functional layer 210 and the second light-emitting functional layer 220, the voltage drop pressure of the second electrode layer 120 can be reduced.

[0074] It should be noted that in other embodiments, the T1 period and the T2' period can be set as two consecutive stages, or the T1 period and the T2' period can be controlled to cycle continuously; the T1' period and the T2 period can be set as two consecutive stages, or the T1' period and the T2 period can be controlled to cycle continuously, which can also achieve the effect of adjusting the color temperature and brightness.

[0075] like Figure 7 As shown, it is a timing diagram in a case where the first control signal S1 is configured as a constant first voltage V2 and the second control signal S2 is configured as a second pulse width modulation signal in a light-emitting period TA, wherein the first electrode layer 110 is a positive electrode, the third electrode layer 130 is a negative electrode, and the voltage V1 of the preset voltage signal S0 is provided to the second electrode layer 120 as an example. In this light-emitting period, the first light-emitting functional layer 210 emits light, is always on, and the light-emitting brightness remains unchanged, and the second light-emitting functional layer 220 emits light, and the light-emitting brightness of the second light-emitting functional layer 220 is adjusted by the second pulse width modulation signal.

[0076] like Figure 8 As shown, it is a timing diagram in a case where the first control signal S1 is configured as a first pulse width modulation signal and the second control signal S2 is configured as a constant second voltage V3 in one light-emitting period TB, wherein the first electrode layer 110 is a positive electrode, the third electrode layer 130 is a negative electrode, and the voltage V1 of the preset voltage signal S0 is provided to the second electrode layer 120 as an example. In this light-emitting period, the first light-emitting functional layer 210 emits light, and the light-emitting brightness of the first light-emitting functional layer 210 is adjusted by the first pulse width modulation signal, and the second light-emitting functional layer 220 emits light, is always on, and the light-emitting brightness remains unchanged.

[0077] In one embodiment, the light emitting device is controlled to periodically perform a light emitting phase, and the light emitting phase includes at least two different light emitting cycles.

[0078] like Fig. 9As shown, there are four different light-emitting periods T1, T2, T1' and T2', wherein each light-emitting period corresponds to a group of first light-emitting functional layers 210 and second light-emitting functional layers 220 with different light-emitting brightness. These four light-emitting periods can be used as a group of light-emitting periods to cyclically control the light emission of the first light-emitting functional layer 210 and the second light-emitting functional layer 220 to adjust the color temperature of the light-emitting device.

[0079] In one embodiment, the first control signal S1 is configured as a first pulse width modulation signal, which includes a first voltage V2 and a voltage V1 of a preset voltage signal S0 that alternate with each other; the second control signal S2 is configured as a second pulse width modulation signal, which includes a second voltage V3 and a voltage V1 of the preset voltage signal S0 that alternate with each other; the first voltage V2 in the first control signal S1 corresponds to the second voltage V3 in the second control signal S2.

[0080] like Fig.10 As shown, it is a timing diagram in the case where the first control signal S1 is configured as a first pulse width modulation signal and the second control signal S2 is configured as a second pulse width modulation signal in one light-emitting period TC, wherein the first electrode layer 110 is a positive electrode, the third electrode layer 130 is a negative electrode, and the voltage V1 of the preset voltage signal S0 is provided to the second electrode layer 120 as an example. Among them, the first voltage V2 in the first control signal S1 and the second voltage V3 in the second control signal S2 correspond in time, that is, at the moment when the first control signal S1 is at a high level (first voltage V2), the second control signal S2 is at a low level (second voltage V3).

[0081] In the TC period, the light emitted by the first light-emitting functional layer 210 and the second light-emitting functional layer 220 are controlled and adjusted simultaneously, so that the light-emitting frequency can be shorter and the light sensitivity is softer than the cycle of T1 period and T2 period or the cycle of T1' period and T2' period.

[0082] In one embodiment, the first control signal S1 is configured as a first pulse width modulation signal, the first pulse width modulation signal includes a first voltage V2 and a voltage V1 of a preset voltage signal S0 that alternate with each other; the second control signal S2 is configured as a second pulse width modulation signal, the second pulse width modulation signal includes a second voltage V3 and a voltage V1 of a preset voltage signal S0 that alternate with each other; the time period of the first voltage V2 in the first control signal S1 is within the time period of the voltage V1 of the preset voltage signal S0 in the second control signal S2; the time period of the second voltage V3 in the second control signal S2 is within the time period of the voltage V1 of the preset voltage signal S0 in the first control signal S1.

[0083] like Fig.11As shown, it is a timing diagram in the case where the first control signal S1 is configured as a first pulse width modulation signal and the second control signal S2 is configured as a second pulse width modulation signal in one light-emitting period TD, wherein the first electrode layer 110 is a positive electrode, the third electrode layer 130 is a negative electrode, and the voltage V1 of the preset voltage signal S0 is provided to the second electrode layer 120 as an example. Among them, the first voltage V2 in the first control signal S1 and the second voltage V3 in the second control signal S2 correspond in time, that is, at the moment when the first control signal S1 is at a high level (first voltage V2), the second control signal S2 is at a low level (second voltage V3). In the TD light-emitting cycle, there are three PWM signals in the first pulse width modulation signal corresponding to the first electrode layer 110, and these three PWM signals control the light-emitting functional layer 210 to emit light; there are two PWM signals in the second pulse width modulation signal corresponding to the third electrode layer 130, and these two PWM signals control the light-emitting functional layer 220 to emit light, wherein the number of PWM in the first pulse width modulation signal and the number of PWM in the second pulse width modulation signal are both adjustable, thereby achieving the effect of color temperature adjustment.

[0084] like Fig.12 As shown, it includes three EL light-emitting cycles TD', TE and TF. When the first pulse width modulation signal of the first electrode layer 110 is the first voltage V2 (high level), the first light-emitting functional layer 210 emits light. When the second pulse width modulation signal of the third electrode layer 130 is the second voltage V3 (low level), the second light-emitting functional layer 220 emits light.

[0085] In the same light-emitting cycle, whether the time period of the first voltage V2 and the time period of the second voltage V3 can overlap needs to be determined according to the process of the first light-emitting functional layer 210 and the second light-emitting functional layer 220. Since the appearance of the first voltage V2 and the second voltage V3 at the same time will cause a large voltage difference between the first electrode layer 110 and the third electrode layer, the large voltage difference may cause the first light-emitting functional layer 210 and / or the second light-emitting functional layer 220 to be broken down, the time when the first voltage V2 and the second voltage V3 appear is staggered so that the first voltage V2 and the second voltage V3 do not overlap (do not touch) at the same time, which can protect the first light-emitting functional layer 210 and the second light-emitting functional layer 220.

[0086] like Fig.12 As shown, for the light-emitting device in which the first light-emitting functional layer 210 and the second light-emitting functional layer 220 need to be protected, the TD' light-emitting cycle may not be used. Instead, the color temperature and brightness may be controlled by changing the time of the TE light-emitting cycle and the TF light-emitting cycle, adjusting the PWM signal of the first pulse width modulation signal and the PWM signal in the second pulse width modulation signal, and cycling the TE light-emitting cycle and the TF light-emitting cycle.

[0087] Embodiment 2

[0088] The present application also provides a display module, comprising a light-emitting device as described in any one of the first aspects.

[0089] The display module provided in this embodiment is based on the same concept as the above-mentioned light-emitting device, so it can at least achieve the beneficial effects that can be achieved by the above-mentioned light-emitting device, which will not be described in detail here.

[0090] The display module can be: electronic paper, mobile phones, tablet computers, televisions, monitors, laptops, digital photo frames, navigators, wearable display devices, and any other products or components with display functions.

[0091] In the implementation scheme of the present application, since the first electrode layer, the first light-emitting functional layer, the second electrode layer, the second light-emitting functional layer and the third electrode layer are stacked in sequence, the light-emitting functional layers overlap in the vertical direction, and the three electrode layers respectively control the luminous brightness of the two light-emitting functional layers that overlap in the vertical direction, thereby adjusting the color temperature of the light-emitting device and realizing the color temperature adjustment function of the surface light source. The implementation scheme of the present application can be used not only for devices with a bottom emission architecture, but also for devices with a top emission architecture. The control timing proposed based on the stacked OLED device proposed in the implementation scheme of the present application can realize flexible regulation of color temperature and brightness, and can also realize protection of the first light-emitting functional layer and the second light-emitting functional layer, thereby meeting the different needs of customers. By changing the materials of the first electrode layer and the third electrode layer according to fixed light emission or bottom light emission, adjusting the timing according to the first light-emitting functional layer and the second light-emitting functional layer, and setting the color of the light emitted by the first light-emitting functional layer and the second light-emitting functional layer according to the required color temperature, the matching between different devices is realized, which can be widely used in different scenes and compatible with different functional applications.

[0092] It should be noted that the above embodiments illustrate the present application rather than limit the present application, and those skilled in the art may design alternative embodiments without departing from the scope of the appended claims. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not deviate from the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

[0093] In the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of means or steps not listed in the claims. The word "a" or "an" preceding a means does not exclude the presence of a plurality of such means. The present application may be implemented by means of hardware comprising several different means and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0094] The above are only preferred specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A light emitting device, characterized in that: include: Light emitting device and control module; The light emitting device comprises a first electrode layer, a first light emitting functional layer, a second electrode layer, a second light emitting functional layer and a third electrode layer which are stacked in sequence; The control module is used to provide a preset voltage signal to one of the first electrode layer, the second electrode layer and the third electrode layer, and to provide a first control signal and a second control signal to the other two, respectively, so as to control the luminous brightness of at least one of the first light-emitting functional layer and the second light-emitting functional layer.

2. The light emitting device according to claim 1, characterized in that: The preset voltage signal is provided to the second electrode layer, the first control signal is provided to the first electrode layer, and the second control signal is provided to the third electrode layer.

3. The light emitting device according to claim 1, characterized in that: In one light-emitting period, the preset voltage signal is provided to the second electrode layer, the first control signal is provided to the first electrode layer, and the second control signal is provided to the third electrode layer.

4. The light emitting device according to claim 3, characterized in that: The first control signal is configured as one of the following: a constant first voltage, wherein the first voltage is different from a voltage of the preset voltage signal; a first pulse width modulated signal; The voltage of the preset voltage signal.

5. The light emitting device according to claim 4, characterized in that: The first pulse width modulation signal includes voltages of the first voltage and the preset voltage signal that alternate with each other.

6. The light emitting device according to claim 3, characterized in that: The second control signal is configured as one of the following: a constant second voltage, wherein the second voltage is different from a voltage of the preset voltage signal; a second pulse width modulated signal; The voltage of the preset voltage signal.

7. The light emitting device according to claim 6, characterized in that: The second pulse width modulation signal includes the second voltage and the preset voltage signal which alternate with each other.

8. The light emitting device according to any one of claims 3 to 7, characterized in that: The light emitting device is controlled to periodically perform a light emitting phase, wherein the light emitting phase includes at least two different light emitting periods.

9. The light emitting device according to claim 3, characterized in that: The first control signal is configured as a first pulse width modulation signal, the first pulse width modulation signal includes the first voltage and the voltage of the preset voltage signal alternating with each other; the second control signal is configured as a second pulse width modulation signal, the second pulse width modulation signal includes the second voltage and the voltage of the preset voltage signal alternating with each other; A first voltage in the first control signal corresponds to a second voltage in the second control signal.

10. The light emitting device according to claim 3, characterized in that: The first control signal is configured as a first pulse width modulation signal, the first pulse width modulation signal includes the first voltage and the voltage of the preset voltage signal alternating with each other; the second control signal is configured as a second pulse width modulation signal, the second pulse width modulation signal includes the second voltage and the voltage of the preset voltage signal alternating with each other; The period of the first voltage in the first control signal is within the period of the preset voltage signal in the second control signal; The period of the second voltage in the second control signal is within the period of the preset voltage signal in the first control signal.

11. The light emitting device according to claim 1, characterized in that: The first light-emitting functional layer emits light of a first color; the second light-emitting functional layer emits light of a second color; the first color is different from the second color.

12. The light emitting device according to claim 11, characterized in that: The first color light is one of red, yellow, green and blue; the second color light is another of red, yellow, green and blue.

13. The light emitting device according to claim 1, characterized in that: The second electrode layer is a light-transmitting film layer, and at least one of the first electrode layer and the third electrode layer is a light-transmitting film layer.

14. A display module, characterized in that: Comprising the light emitting device according to any one of claims 1 to 13.

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