CN110718187A - Display device, pixel unit and driving method thereof - Google Patents
Display device, pixel unit and driving method thereof Download PDFInfo
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- CN110718187A CN110718187A CN201911060602.5A CN201911060602A CN110718187A CN 110718187 A CN110718187 A CN 110718187A CN 201911060602 A CN201911060602 A CN 201911060602A CN 110718187 A CN110718187 A CN 110718187A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
Abstract
The invention discloses a display device, a pixel unit and a driving method thereof, relating to the technical field of display, wherein the pixel unit comprises: a drive unit; the first switch unit is electrically connected with the driving unit and is used for conducting to transmit the driving current when the driving current output by the driving unit is smaller than a first threshold current; at least one first light emitting structure electrically connected to the first switching unit; the second switch unit is electrically connected with the driving unit and is used for conducting to transmit the driving current when the driving current output by the driving unit is greater than or equal to a second threshold current; at least one second light emitting structure electrically connected to the second switching unit; the second threshold current is less than or equal to the first threshold current; the size of the first light emitting structure is smaller than the size of the second light emitting structure. The invention effectively improves the luminous efficiency of the pixel unit and reduces the power consumption.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device, a pixel unit and a driving method thereof.
Background
Compared to an OLED (Organic Light-Emitting Diode), the LED has higher brightness, better Light-Emitting efficiency, and lower power consumption. With the development of led technology, leds have been used not only as backlights.
With the development of the technology, Micro LEDs (Micro LEDs) gradually expose corners in the field of display technology, and become a new generation of display technology. Since the light emission efficiency of the Micro LED is in a state where it is first increased and then decreased as the current density increases, it is necessary to control the current density interval of the Micro LED in order to increase the light emission efficiency of the Micro LED. In the prior art, when the current density is small and large, the Micro LED in the pixel unit has low luminous efficiency.
Disclosure of Invention
In view of the above, the present invention provides a display device, a pixel unit and a driving method thereof, which effectively improve the light emitting efficiency of the pixel unit.
In a first aspect, the present invention provides a pixel cell, comprising: the driving unit is used for generating a driving current according to the data signal under the control of the first scanning signal; the first switch unit is electrically connected with the driving unit and is used for conducting to transmit the driving current when the driving current output by the driving unit is smaller than a first threshold current; at least one first light emitting structure electrically connected with the first switch unit, for emitting light under the driving of the driving current output by the first switch unit; the second switch unit is electrically connected with the driving unit and is used for conducting to transmit the driving current when the driving current output by the driving unit is greater than or equal to a second threshold current; at least one second light emitting structure electrically connected to the second switching unit, for emitting light under the driving of the driving current output from the second switching unit; the second threshold current is less than or equal to the first threshold current; the size of the first light emitting structure is smaller than the size of the second light emitting structure.
In a second aspect, the present invention provides a display device comprising the display device provided by the present invention.
In a third aspect, the present invention provides a driving method of a pixel unit, for driving the pixel unit provided by the present invention; the driving method comprises the following steps: under the control of a first scanning signal, a driving unit generates a driving current according to a data signal; when the driving current output by the driving unit is smaller than the first threshold current, the first switch unit is conducted and transmits the driving current, and the first light-emitting structure emits light under the driving of the driving current output by the first switch unit; when the driving current output by the driving unit is larger than or equal to the second threshold current, the second switch unit is conducted and transmits the driving current, and the second light-emitting structure emits light under the driving of the driving current output by the second switch unit.
Compared with the prior art, the display device, the pixel unit and the driving method thereof provided by the invention at least realize the following beneficial effects:
the pixel unit provided by the invention comprises a driving unit, a first switch unit, a first light-emitting structure, a second switch unit and a second light-emitting structure, wherein the first switch unit and the second switch unit are electrically connected with the driving unit, the first light-emitting structure is electrically connected with the first switch unit, and the second light-emitting structure is electrically connected with the second switch unit. The driving unit generates a driving current according to the data signal under the control of the first scanning signal, when the driving current output by the driving unit is smaller than a first threshold current, the first switch unit is switched on to transmit the driving current, and the first light-emitting structure emits light under the driving of the driving current output by the first switch unit; when the driving current output by the driving unit is greater than or equal to the second threshold current, the second switching unit is turned on to transmit the driving current, and the second light-emitting structure emits light under the driving of the driving current output by the second switching unit. The second threshold current is less than or equal to the first threshold current, the size of the first light-emitting structure is less than that of the second light-emitting structure, namely the light-emitting area of the first light-emitting structure is less than that of the second light-emitting structure, when the driving current is less than the first threshold current, the light-emitting efficiency of the first light-emitting structure with a small light-emitting area is high, and when the driving current is greater than or equal to the first threshold current, the light-emitting efficiency of the first light-emitting structure is low; when the driving current is less than the second threshold current, the light emitting efficiency of the second light emitting structure having a large light emitting area is low, and when the driving current is greater than or equal to the second threshold current, the light emitting efficiency of the second light emitting structure is high. Therefore, when the driving current output by the driving unit is smaller than the first threshold current, the first light-emitting structure with the small light-emitting area is controlled to emit light, and when the driving current output by the driving unit is larger than or equal to the second threshold current, the second light-emitting structure with the large light-emitting area is controlled to emit light, so that the light-emitting efficiency of the pixel unit is effectively improved, and the power consumption is reduced.
Of course, it is not necessary for any product in which the present invention is practiced to specifically achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a frame structure of a pixel unit according to the present invention;
FIG. 2 is a graph of the luminous efficiency of different sized light emitting structures at different currents;
FIG. 3 is a schematic diagram of a frame structure of another pixel unit provided in the present invention;
FIG. 4 is a circuit diagram of a first comparing unit in the pixel unit shown in FIG. 3;
FIG. 5 is a schematic diagram of an output signal of an output terminal of a first comparator in the first comparing unit shown in FIG. 4;
FIG. 6 is a circuit diagram of a second comparison unit in the pixel cell of FIG. 3;
FIG. 7 is a schematic diagram of an output signal of an output terminal of a second comparator in the second comparing unit shown in FIG. 6;
FIG. 8 is a circuit diagram of another pixel cell provided by the present invention;
FIG. 9 is a circuit schematic of yet another pixel cell provided by the present invention;
FIG. 10 is a schematic diagram of a frame structure of another pixel unit according to the present invention;
FIG. 11 is a schematic diagram of a frame structure of another pixel unit according to the present invention;
FIG. 12 is a schematic structural diagram of a display device according to the present invention;
FIG. 13 is a schematic cross-sectional view of another display device provided in accordance with the present invention;
FIG. 14 is a schematic cross-sectional view of another display device provided by the present invention;
fig. 15 is a schematic workflow diagram of a driving method of a pixel unit according to the present invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic diagram of a frame structure of a pixel unit provided in the present invention, and referring to fig. 1, the present embodiment provides a pixel unit, including: a driving unit 10 for generating a driving current according to a data signal under the control of a first scan signal;
a first switching unit 21 electrically connected to the driving unit 10, for conducting to transmit the driving current when the driving current output by the driving unit 10 is less than a first threshold current;
at least one first light emitting structure 31 electrically connected to the first switching unit 21, for emitting light under the driving of the driving current output from the first switching unit 21;
a second switching unit 22 electrically connected to the driving unit 10, for conducting to transmit the driving current when the driving current output by the driving unit 10 is greater than or equal to a second threshold current;
at least one second light emitting structure 32 electrically connected to the second switching unit 22, for emitting light under the driving of the driving current output from the second switching unit 22;
the second threshold current is less than or equal to the first threshold current;
the size of the first light emitting structure 31 is smaller than that of the second light emitting structure 32.
Specifically, the pixel unit provided in this embodiment includes a driving unit 10, a first switch unit 21, a first light emitting structure 31, a second switch unit 22, and a second light emitting structure 32, where the first switch unit 21 and the second switch unit 22 are both electrically connected to the driving unit 10, the first light emitting structure 31 is electrically connected to the first switch unit 21, and the second light emitting structure 32 is electrically connected to the second switch unit 22. The driving unit 10 generates a driving current according to the data signal under the control of the first scan signal, when the driving current output by the driving unit 10 is less than the first threshold current, the first switching unit 21 is turned on to transmit the driving current, and the first light emitting structure 31 emits light under the driving of the driving current output by the first switching unit 21; when the driving current output by the driving unit 10 is greater than or equal to the second threshold current, the second switching unit 22 is turned on to transmit the driving current, and the second light emitting structure 32 emits light under the driving of the driving current output by the second switching unit 22.
The second threshold current is less than or equal to the first threshold current, when the second threshold current is equal to the first threshold current, that is, when the driving current is less than the first threshold current, the first light emitting structure 31 emits light, and when the driving current is greater than or equal to the first threshold current, the second light emitting structure 32 emits light; when the second threshold current is less than the first threshold current, that is, when the driving current is less than the first threshold current, the first light emitting structure 31 emits light, when the driving current is greater than or equal to the second threshold current and less than the first threshold current, both the first light emitting structure 31 and the second light emitting structure 32 emit light, and when the driving current is greater than or equal to the first threshold current, the second light emitting structure 32 emits light.
Fig. 2 is a schematic diagram showing the luminous efficiencies of light emitting structures of different sizes at different currents, and referring to fig. 2, the luminous efficiencies are different when the same driving current is supplied to the light emitting structures of different sizes. Specifically, as the driving current increases, the current density of the small-sized light emitting structure increases more rapidly, so that when the driving current is smaller, the light emitting efficiency of the small-sized light emitting structure is higher, and as the driving current continuously increases, the light emitting efficiency of the small-sized light emitting structure gradually decreases, while the light emitting efficiency of the large-sized light emitting structure gradually increases, thereby gradually exceeding the light emitting efficiency of the small-sized light emitting structure at the same driving current. In the present invention, the size of the light emitting structure refers to the light emitting area of the light emitting structure.
In this embodiment, the size of the first light emitting structure 31 is smaller than the size of the second light emitting structure 32, that is, the light emitting area of the first light emitting structure 31 is smaller than the light emitting area of the second light emitting structure 32, when the driving current is smaller than the first threshold current, the light emitting efficiency of the first light emitting structure 31 with a small light emitting area is high, and when the driving current is greater than or equal to the first threshold current, the light emitting efficiency of the first light emitting structure 31 is low; when the driving current is less than the second threshold current, the light emitting efficiency of the second light emitting structure 32 having a large light emitting area is low, and when the driving current is greater than or equal to the second threshold current, the light emitting efficiency of the second light emitting structure 32 is high. Therefore, when the driving current output by the driving unit 10 is smaller than the first threshold current, the first light emitting structure 31 with a small light emitting area is controlled to emit light, and when the driving current output by the driving unit 10 is greater than or equal to the second threshold current, the second light emitting structure 32 with a large light emitting area is controlled to emit light, so that the light emitting efficiency of the pixel unit is effectively improved, and the power consumption is reduced.
It should be noted that the first threshold current and the second threshold current may be set according to the light emitting characteristics of the first light emitting structure 31 and the second light emitting structure 32 in the actual production process, and the present invention is not limited thereto.
For example, in this embodiment, the first light emitting structure 31 and the second light emitting structure 32 may be Micro LEDs (Micro LEDs), and in other embodiments of the present invention, the first light emitting structure 31 and the second light emitting structure 32 may also be other light emitting structures, which is not described herein again.
Fig. 3 is a schematic diagram of a frame structure of another pixel unit provided by the present invention, referring to fig. 3, optionally, wherein the first switch unit 21 includes a first transistor T1 and a first comparator unit 211, a control terminal of the first transistor T1 is electrically connected to the first comparator unit 211, a first terminal of the first transistor T1 is electrically connected to the driving unit 10, and a second terminal of the first transistor T1 is electrically connected to the first light emitting structure 31;
the second switching unit 22 includes a second transistor T2 and a second comparator unit 221, a control terminal of the second transistor T2 is electrically connected to the second comparator unit 221, a first terminal of the second transistor T2 is electrically connected to the driving unit 10, and a second terminal of the second transistor T2 is electrically connected to the second light emitting structure 32.
Specifically, with reference to fig. 3, the first switch unit 21 includes a first transistor T1 and a first comparator unit 211, a control terminal of the first transistor T1 is electrically connected to the first comparator unit 211, a first terminal of the first transistor T1 is electrically connected to the driving unit 10, a second terminal of the first transistor T1 is electrically connected to the first light emitting structure 31, when the driving current output by the driving unit 10 is smaller than the first threshold current, the first comparator unit 211 controls the first transistor T1 to be turned on, the driving current is transmitted from the driving unit 10 to the first light emitting structure 31, and thus the first light emitting structure 31 emits light under the driving of the driving current output by the first switch unit 21.
The second switching unit 22 includes a second transistor T2 and a second comparator unit 221, a control terminal of the second transistor T2 is electrically connected to the second comparator unit 221, a first terminal of the second transistor T2 is electrically connected to the driving unit 10, a second terminal of the second transistor T2 is electrically connected to the second light emitting structure 32, when the driving current output from the driving unit 10 is greater than or equal to the second threshold current, the second comparator unit 221 controls the second transistor T2 to be turned on, the driving current is transmitted from the driving unit 10 to the second light emitting structure 32, and thus the second light emitting structure 32 emits light under the driving of the driving current output from the second switching unit 22.
Fig. 4 is a circuit schematic diagram of a first comparing unit in the pixel unit shown in fig. 3, fig. 5 is a circuit schematic diagram of an output signal of an output terminal of a first comparator in the first comparing unit shown in fig. 4, fig. 6 is a circuit schematic diagram of a second comparing unit in the pixel unit shown in fig. 3, fig. 7 is a circuit schematic diagram of an output terminal of a second comparator in the second comparing unit shown in fig. 6, referring to fig. 3-7, optionally, wherein the first comparator unit 211 comprises a first comparator OA1, a first input terminal Vr1 of the first comparator OA1 is electrically connected to a first reference voltage signal terminal, a second input terminal Vin1 of the first comparator OA1 is electrically connected to the driving unit 10, and an output terminal Vout1 of the first comparator OA1 is electrically connected to a control terminal of the first transistor T1;
when the voltage of the second input terminal Vin1 of the first comparator OA1 is less than the voltage of the first input terminal Vr1 of the first comparator OA1, the output terminal Vout1 of the first comparator OA1 outputs a high-level signal; when the voltage of the second input terminal Vin1 of the first comparator OA1 is greater than or equal to the voltage of the first input terminal Vr1 of the first comparator OA1, the output terminal Vout1 of the first comparator OA1 outputs a low potential signal;
the second comparator unit 221 includes a second comparator OA2, a first input terminal Vin2 of the second comparator OA2 is electrically connected to the driving unit 10, a second input terminal Vr2 of the second comparator OA2 is electrically connected to the second reference voltage signal terminal, and an output terminal Vout2 of the second comparator OA2 is electrically connected to the control terminal of the second transistor T2;
when the voltage of the first input terminal Vin2 of the second comparator OA2 is less than the voltage of the second input terminal Vr2 of the second comparator OA2, the output terminal Vout2 of the second comparator OA2 outputs a low potential signal; when the voltage of the first input terminal Vin2 of the second comparator OA2 is greater than or equal to the voltage of the second input terminal Vr2 of the second comparator OA2, the output terminal Vout2 of the second comparator OA2 outputs a high potential signal.
In particular, with continued reference to fig. 3-7, the first comparator unit 211 comprises a first comparator OA1, the first input Vr1 of the first comparator OA1 being electrically connected to the first reference voltage signal terminal, the second input Vin1 of the first comparator OA1 being electrically connected to the drive unit 10, the output Vout1 of the first comparator OA1 being electrically connected to the control terminal of the first transistor T1; the driving unit 10 provides a voltage signal to the second input terminal Vin1 of the first comparator OA1, when the voltage of the second input terminal Vin1 of the first comparator OA1 is less than the voltage of the first input terminal Vr1 of the first comparator OA1, the output terminal Vout1 of the first comparator OA1 outputs a high-potential signal to the control terminal of the first transistor T1, the first transistor T1 is turned on, and a driving current is transmitted from the driving unit 10 to the first light emitting structure 31, so that the first light emitting structure 31 emits light under the driving of the driving current output by the first switching unit 21; when the voltage of the second input terminal Vin1 of the first comparator OA1 is greater than or equal to the voltage of the first input terminal Vr1 of the first comparator OA1, the output terminal Vout1 of the first comparator OA1 outputs a low-level signal to the control terminal of the first transistor T1, the first transistor T1 is turned off, and the first light-emitting structure 31 does not emit light.
The second comparator unit 221 includes a second comparator OA2, a first input terminal Vin2 of the second comparator OA2 is electrically connected to the driving unit 10, a second input terminal Vr2 of the second comparator OA2 is electrically connected to the second reference voltage signal terminal, and an output terminal Vout2 of the second comparator OA2 is electrically connected to the control terminal of the second transistor T2; the driving unit 10 provides a voltage signal to the second input terminal Vin2 of the second comparator OA2, when the voltage of the first input terminal Vin2 of the second comparator OA2 is less than the voltage of the second input terminal Vr2 of the second comparator OA2, the output terminal Vout2 of the second comparator OA2 outputs a low-potential signal to the control terminal of the second transistor T2, the second transistor T2 is turned off, and the second light emitting structure 32 does not emit light; when the voltage of the first input terminal Vin2 of the second comparator OA2 is greater than or equal to the voltage of the second input terminal Vr2 of the second comparator OA2, the output terminal Vout2 of the second comparator OA2 outputs a high potential signal to the control terminal of the second transistor T2, the second transistor T2 is turned on, and a driving current is transmitted from the driving unit 10 to the second light emitting structure 32, so that the second light emitting structure 32 emits light under the driving of the driving current output from the second switching unit 22.
It should be noted that fig. 3 exemplarily shows that the first transistor T1 and the second transistor T2 are N-type transistors, and fig. 4 to 7 exemplarily show circuit configurations of the first comparator unit and the second comparator unit based on the case where the first transistor T1 and the second transistor T2 are N-type transistors, and the general N-type transistor is turned on under the control of a high-level signal and turned off under the control of a low-level signal. In some optional embodiments, the first transistor T1 and the second transistor T2 may also be P-type transistors, and the P-type transistors are turned on under the control of a low level signal and turned off under the control of a high level signal, and at this time, the circuit structures of the first comparator unit and the second comparator unit will also be changed accordingly, which is not described herein again.
Fig. 8 is a circuit schematic diagram of another pixel unit provided in the present invention, referring to fig. 8, wherein, alternatively, the driving unit 10 includes a third transistor T3, a fourth transistor T4 and a first capacitor C1;
a control terminal of the third transistor T3 receives the first scan signal S1, a first terminal of the third transistor T3 receives the data signal Vdata, and a second terminal of the third transistor T3 is electrically connected to a control terminal of the fourth transistor T4;
a first terminal of the fourth transistor T4 is electrically connected to the first voltage signal terminal PVDD, and a second terminal of the fourth transistor T4 is electrically connected to the first switch unit 21 and the second switch unit 22;
a first terminal of the first capacitor C1 is electrically connected to the control terminal of the fourth transistor T4, and a second terminal of the first capacitor C1 is electrically connected to the second terminal of the fourth transistor T4.
Specifically, the driving unit 10 includes a third transistor T3, a fourth transistor T4, and a first capacitor C1, wherein a control terminal of the third transistor T3 receives a first scan signal S1, the third transistor T3 is turned off when the first scan signal S1 is a low-level signal, the third transistor T3 is turned on when the first scan signal S1 is a high-level signal, a first terminal of the third transistor T3 receives a data signal Vdata, the data signal Vdata is transmitted to a control terminal of the fourth transistor T4, the fourth transistor T4 is turned on, and the first terminal of the fourth transistor T4 is electrically connected to the first voltage signal terminal PVDD, so that the fourth transistor T4 generates a driving current.
Fig. 9 is a circuit diagram of another pixel unit provided by the present invention, referring to fig. 9, optionally, wherein the driving unit 10 further includes a fifth transistor T5, a control terminal of the fifth transistor T5 is electrically connected to the second scan signal S2, a first terminal of the fifth transistor S2 is electrically connected to the third reference voltage signal terminal Vref, and a second terminal of the fifth transistor T5 is electrically connected to the second terminal of the fourth transistor T4.
Specifically, with continued reference to fig. 9, the driving unit 10 further includes a fifth transistor T5, a control terminal of the fifth transistor T5 is electrically connected to the second scan signal S2, when the first scan signal S2 is a low-level signal, the fifth transistor T5 is turned off, when the second scan signal S2 is a high-level signal, the fifth transistor T5 is turned on, and the first terminal of the fifth transistor T5 receives the reset signal of the third reference voltage signal terminal Vref, so that the potential of the second terminal of the fourth transistor T4 is reset.
It should be noted that, in this embodiment, it is exemplarily shown that the third transistor T3, the fourth transistor T4, and the fifth transistor T5 are all N-type transistors, and in other embodiments of the present invention, the third transistor T3, the fourth transistor T4, and the fifth transistor T5 may also be all P-type transistors, or may be partially N-type transistors and partially P-type transistors, which is not described herein again.
In addition, in the embodiment of the present invention, the first terminal of the transistor is a source, the second terminal is a drain, and the control terminal is a gate, but the exemplary embodiments of the present disclosure are not limited thereto, for example, the first terminal of the transistor may also be a drain, and the second terminal is a source, which is also within the protection scope of the present invention.
Fig. 10 is a schematic diagram of a frame structure of another pixel unit provided by the present invention, and referring to fig. 10, optionally, the pixel unit further includes a third switching unit 23 electrically connected to the driving unit 10, and configured to be turned on to transmit a driving current when the driving current output by the driving unit 10 is greater than or equal to a third threshold current;
at least one third light emitting structure 33 electrically connected to the third switching unit 23, for emitting light under the driving of the driving current output from the third switching unit 23;
the third threshold current is greater than the second threshold current;
the size of the second light emitting structure 32 is smaller than that of the third light emitting structure 33.
Specifically, with continued reference to fig. 10, the driving unit 10 generates a driving current according to the data signal under the control of the first scan signal, when the driving current output by the driving unit 10 is greater than or equal to the third threshold current, the third switching unit 23 is turned on to transmit the driving current, and the third light emitting structure 33 emits light under the driving of the driving current output by the third switching unit 23.
The third threshold current is greater than the second threshold current, the size of the second light emitting structure 32 is smaller than the size of the third light emitting structure 33, that is, the light emitting area of the second light emitting structure 32 is smaller than the light emitting area of the third light emitting structure 33, when the driving current is greater than or equal to the second threshold current, the light emitting efficiency of the second light emitting structure 32 is high, and when the driving current is greater than or equal to the third threshold current, the light emitting efficiency of the third light emitting structure 33 is high, so that when the driving current output by the driving unit 10 is greater than or equal to the third threshold current, the third light emitting structure 33 with a larger light emitting area is controlled to emit light, and the light emitting efficiency of the pixel unit is further improved.
It should be noted that, this embodiment exemplarily shows that the pixel unit includes three light emitting structures with different sizes and corresponding on-off units, in other embodiments of the present invention, the pixel unit may further include more than three light emitting structures with different sizes and corresponding on-off units, which is not described again in the present invention.
Fig. 11 is a schematic diagram of a frame structure of another pixel unit provided by the present invention, and referring to fig. 11, alternatively, the number of the first light emitting structures 31 is at least two; and/or the presence of a gas in the gas,
the number of the second light emitting structures 32 is at least two.
It should be noted that fig. 11 exemplarily shows that the number of the first light emitting structures 31 and the number of the second light emitting structures 32 are both two, in other embodiments of the present invention, the number of the first light emitting structures 31 and the number of the second light emitting structures 32 may also be three or more, the number of the first light emitting structures 31 and the number of the second light emitting structures 32 may be set to be different, the number of the first light emitting structures 31 and the number of the second light emitting structures 32 may be set according to actual production needs, and the present invention is not described in detail herein.
The present embodiment provides a display device including the pixel unit as described above.
Referring to fig. 12, fig. 12 is a schematic structural diagram of a display device according to the present invention. Fig. 12 provides a display device 1000 including a pixel unit, wherein the pixel unit is provided in any one of the embodiments of the invention. The embodiment of fig. 12 is only an example of a mobile phone, and the display device 1000 is described, it is to be understood that the display device provided in the embodiment of the present invention may be other display devices having a display function, such as a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device provided in the embodiment of the present invention has the beneficial effects of the pixel unit provided in the embodiment of the present invention, and specific reference may be made to the specific description of the pixel unit in each of the above embodiments, which is not repeated herein.
Fig. 13 is a schematic cross-sectional structure view of another display device provided by the present invention, and referring to fig. 13, the display device further includes a substrate 100 and an array layer 200 disposed on one side of the substrate 100;
the first light-emitting structure 31 and the second light-emitting structure 32 are located on one side of the array layer 200 away from the substrate 100, and the first light-emitting structure 31 and the second light-emitting structure 32 are arranged in the same layer;
first switch cells (not shown in fig. 13) and second switch cells (not shown in fig. 13) are disposed on the array layer 200.
Specifically, with reference to fig. 13, the first light emitting structure 31 and the second light emitting structure 32 grow on different growth substrates, and then are transferred to the side of the array layer 200 away from the substrate 100, the first light emitting structure 31 and the second light emitting structure 32 are disposed on the same layer, and the first switch unit (not shown in fig. 13) and the second switch unit (not shown in fig. 13) can be disposed in the array layer 200 by patterning layer by layer, so as to effectively reduce the bezel size of the display device, and facilitate the realization of a narrow bezel of the display device.
Fig. 14 is a schematic cross-sectional structure view of still another display device provided by the present invention, and referring to fig. 14, the display device further includes a chip (not shown in fig. 14), a substrate 100, and an array layer 200 on one side of the substrate 100;
the first light-emitting structure 31 and the second light-emitting structure 32 are located on one side of the array layer 200 away from the substrate 100, and the first light-emitting structure 31 and the second light-emitting structure 32 are arranged in the same layer;
the first switching unit includes a first transistor T1 and a first comparator unit (not shown in fig. 14), a control terminal of the first transistor T1 is electrically connected with the first comparator unit, a first terminal of the first transistor T1 is electrically connected with the driving unit (not shown in fig. 14), and a second terminal of the first transistor T1 is electrically connected with the first light emitting structure 31;
the second switching unit includes a second transistor T2 and a second comparator unit (not shown in fig. 14), a control terminal of the second transistor T2 is electrically connected to the second comparator unit, a first terminal of the second transistor T2 is electrically connected to the driving unit (not shown in fig. 14), and a second terminal of the second transistor T2 is electrically connected to the second light emitting structure 32;
the first transistor T1 and the second transistor T2 are disposed at the array layer 200, the first comparator unit and the second comparator unit are integrated in a chip, and the chip is bound to the array layer 200.
Specifically, with reference to fig. 14, the first light emitting structure 31 and the second light emitting structure 32 are grown on different growth substrates, and then transferred to the side of the array layer 200 away from the substrate 100, the first light emitting structure 31 and the second light emitting structure 32 are disposed on the same layer, the first transistor T1 and the second transistor T2 are disposed in the array layer 200, the first comparator unit and the second comparator unit are integrated in a chip, and the chip is bound to the array layer 200, so that the process difficulty of the display device is effectively reduced, and the production cost is reduced.
Fig. 15 is a schematic workflow diagram of a driving method of a pixel unit provided by the present invention, and fig. 15 illustrates a driving method of a pixel unit for the pixel unit described above according to the present embodiment; the driving method comprises the following steps:
301, under the control of a first scanning signal, a driving unit generates a driving current according to a data signal;
when the driving current output by the driving unit is smaller than the first threshold current, executing step 302;
when the driving current output by the driving unit is greater than or equal to the second threshold current, executing step 303;
Specifically, referring to fig. 1 and fig. 15, the present embodiment further explains the driving method of the pixel unit in the above embodiment, the driving unit 10 generates the driving current according to the data signal under the control of the first scan signal; when the driving current output by the driving unit 10 is less than the first threshold current, the first switching unit 21 is turned on to transmit the driving current, the first light-emitting structure 31 emits light under the driving of the driving current output by the first switching unit 21, and when the driving current output by the driving unit 10 is greater than or equal to the first threshold current, the first switching unit 21 is turned off, and the first light-emitting structure 31 does not emit light; when the driving current output by the driving unit 10 is greater than or equal to the second threshold current, the second switching unit 22 is turned on to transmit the driving current, the second light emitting structure 32 emits light under the driving of the driving current output by the second switching unit 22, and when the driving current output by the driving unit 10 is less than the second threshold current, the second switching unit 22 is turned off and the second light emitting structure 32 does not emit light.
The second threshold current is less than or equal to the first threshold current, when the second threshold current is equal to the first threshold current, that is, when the driving current is less than the first threshold current, the first light emitting structure 31 emits light, and when the driving current is greater than or equal to the first threshold current, the second light emitting structure 32 emits light; when the second threshold current is less than the first threshold current, that is, when the driving current is less than the first threshold current, the first light emitting structure 31 emits light, when the driving current is greater than or equal to the second threshold current and less than the first threshold current, both the first light emitting structure 31 and the second light emitting structure 32 emit light, and when the driving current is greater than or equal to the first threshold current, the second light emitting structure 32 emits light.
The size of the first light emitting structure 31 in the pixel unit is smaller than the size of the second light emitting structure 32, that is, the light emitting area of the first light emitting structure 31 is smaller than the light emitting area of the second light emitting structure 32, when the driving current is smaller than the first threshold current, the light emitting efficiency of the first light emitting structure 31 with a small light emitting area is high, and when the driving current is greater than or equal to the first threshold current, the light emitting efficiency of the first light emitting structure 31 is low; when the driving current is less than the second threshold current, the light emitting efficiency of the second light emitting structure 32 having a large light emitting area is low, and when the driving current is greater than or equal to the second threshold current, the light emitting efficiency of the second light emitting structure 32 is high. Therefore, by the driving method provided by the embodiment, when the driving current output by the driving unit 10 is smaller than the first threshold current, the first light emitting structure 31 with a small light emitting area is controlled to emit light, and when the driving current output by the driving unit 10 is greater than or equal to the second threshold current, the second light emitting structure 32 with a large light emitting area is controlled to emit light, so that the light emitting efficiency of the pixel unit is effectively improved.
As can be seen from the foregoing embodiments, the display device, the pixel unit and the driving method thereof provided by the present invention at least achieve the following advantages:
the pixel unit provided by the invention comprises a driving unit, a first switch unit, a first light-emitting structure, a second switch unit and a second light-emitting structure, wherein the first switch unit and the second switch unit are electrically connected with the driving unit, the first light-emitting structure is electrically connected with the first switch unit, and the second light-emitting structure is electrically connected with the second switch unit. The driving unit generates a driving current according to the data signal under the control of the first scanning signal, when the driving current output by the driving unit is smaller than a first threshold current, the first switch unit is switched on to transmit the driving current, and the first light-emitting structure emits light under the driving of the driving current output by the first switch unit; when the driving current output by the driving unit is greater than or equal to the second threshold current, the second switching unit is turned on to transmit the driving current, and the second light-emitting structure emits light under the driving of the driving current output by the second switching unit. The second threshold current is less than or equal to the first threshold current, the size of the first light-emitting structure is less than that of the second light-emitting structure, namely the light-emitting area of the first light-emitting structure is less than that of the second light-emitting structure, when the driving current is less than the first threshold current, the light-emitting efficiency of the first light-emitting structure with a small light-emitting area is high, and when the driving current is greater than or equal to the first threshold current, the light-emitting efficiency of the first light-emitting structure is low; when the driving current is less than the second threshold current, the light emitting efficiency of the second light emitting structure having a large light emitting area is low, and when the driving current is greater than or equal to the second threshold current, the light emitting efficiency of the second light emitting structure is high. Therefore, when the driving current output by the driving unit is smaller than the first threshold current, the first light-emitting structure with the small light-emitting area is controlled to emit light, and when the driving current output by the driving unit is larger than or equal to the second threshold current, the second light-emitting structure with the large light-emitting area is controlled to emit light, so that the light-emitting efficiency of the pixel unit is effectively improved, and the power consumption is reduced.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (11)
1. A pixel cell, comprising:
the driving unit is used for generating a driving current according to the data signal under the control of the first scanning signal;
the first switch unit is electrically connected with the driving unit and is used for conducting to transmit the driving current when the driving current output by the driving unit is smaller than a first threshold current;
at least one first light emitting structure electrically connected to the first switching unit, for emitting light under the driving of the driving current output by the first switching unit;
the second switch unit is electrically connected with the driving unit and is used for conducting to transmit the driving current when the driving current output by the driving unit is greater than or equal to the second threshold current;
at least one second light emitting structure electrically connected to the second switching unit, for emitting light under the driving of the driving current output by the second switching unit;
the second threshold current is less than or equal to the first threshold current;
the size of the first light emitting structure is smaller than the size of the second light emitting structure.
2. The pixel cell of claim 1,
the first switch unit comprises a first transistor and a first comparator unit, wherein the control end of the first transistor is electrically connected with the first comparator unit, the first end of the first transistor is electrically connected with the driving unit, and the second end of the first transistor is electrically connected with the first light-emitting structure;
the second switch unit comprises a second transistor and a second comparator unit, wherein the control end of the second transistor is electrically connected with the second comparator unit, the first end of the second transistor is electrically connected with the driving unit, and the second end of the second transistor is electrically connected with the second light-emitting structure.
3. The pixel cell of claim 2,
the first comparator unit comprises a first comparator, a first input end of the first comparator is electrically connected with the first reference voltage signal end, a second input end of the first comparator is electrically connected with the driving unit, and an output end of the first comparator is electrically connected with a control end of the first transistor;
when the voltage of the second input end of the first comparator is smaller than the voltage of the first input end of the first comparator, the output end of the first comparator outputs a high-potential signal; when the voltage of the second input end of the first comparator is greater than or equal to the voltage of the first input end of the first comparator, the output end of the first comparator outputs a low-potential signal;
the second comparator unit comprises a second comparator, a first input end of the second comparator is electrically connected with the driving unit, a second input end of the second comparator is electrically connected with the second reference voltage signal end, and an output end of the second comparator is electrically connected with the control end of the second transistor;
when the voltage of the first input end of the second comparator is smaller than the voltage of the second input end of the second comparator, the output end of the second comparator outputs a low-potential signal; and when the voltage of the first input end of the second comparator is greater than or equal to the voltage of the second input end of the second comparator, the output end of the second comparator outputs a high-potential signal.
4. The pixel cell of claim 1,
the driving unit comprises a third transistor, a fourth transistor and a first capacitor;
a control end of the third transistor receives the first scan signal, a first end of the third transistor receives the data signal, and a second end of the third transistor is electrically connected with a control end of the fourth transistor;
a first end of the fourth transistor is electrically connected with a first voltage signal end, and a second end of the fourth transistor is electrically connected with the first switch unit and the second switch unit;
the first end of the first capacitor is electrically connected with the control end of the fourth transistor, and the second end of the first capacitor is electrically connected with the second end of the fourth transistor.
5. The pixel cell of claim 4,
the driving unit further comprises a fifth transistor, a control end of the fifth transistor is electrically connected with the second scanning signal, a first end of the fifth transistor is electrically connected with a third reference voltage signal end, and a second end of the fifth transistor is electrically connected with a second end of the fourth transistor.
6. The pixel cell of claim 1, further comprising:
the third switching unit is electrically connected with the driving unit and is used for conducting to transmit the driving current when the driving current output by the driving unit is greater than or equal to the third threshold current;
at least one third light emitting structure electrically connected to the third switching unit, for emitting light under the driving of the driving current output from the third switching unit;
the third threshold current is greater than the second threshold current;
the size of the second light emitting structure is smaller than that of the third light emitting structure.
7. The pixel cell of claim 1,
the number of the first light-emitting structures is at least two; and/or the presence of a gas in the gas,
the number of the second light emitting structures is at least two.
8. A display device comprising a pixel cell according to any one of claims 1 to 7.
9. The display device according to claim 8, further comprising a substrate base plate and an array layer on one side of the substrate base plate;
the first light-emitting structure and the second light-emitting structure are positioned on one side of the array layer, which is far away from the substrate base plate, and the first light-emitting structure and the second light-emitting structure are arranged on the same layer;
the first switch unit and the second switch unit are disposed on the array layer.
10. The display device according to claim 8, further comprising a chip, a substrate base plate, and an array layer on one side of the substrate base plate;
the first light-emitting structure and the second light-emitting structure are positioned on one side of the array layer, which is far away from the substrate base plate, and the first light-emitting structure and the second light-emitting structure are arranged on the same layer;
the first switch unit comprises a first transistor and a first comparator unit, wherein the control end of the first transistor is electrically connected with the first comparator unit, the first end of the first transistor is electrically connected with the driving unit, and the second end of the first transistor is electrically connected with the first light-emitting structure;
the second switch unit comprises a second transistor and a second comparator unit, wherein the control end of the second transistor is electrically connected with the second comparator unit, the first end of the second transistor is electrically connected with the driving unit, and the second end of the second transistor is electrically connected with the second light-emitting structure;
the first transistor and the second transistor are disposed on the array layer, the first comparator unit and the second comparator unit are integrated in the chip, and the chip is bound to the array layer.
11. A method of driving a pixel cell, for driving a pixel cell according to any one of claims 1 to 7;
the driving method includes:
under the control of a first scanning signal, the driving unit generates a driving current according to a data signal;
when the driving current output by the driving unit is smaller than a first threshold current, the first switch unit is switched on and transmits the driving current, and the first light-emitting structure emits light under the driving of the driving current output by the first switch unit;
when the driving current output by the driving unit is greater than or equal to the second threshold current, the second switch unit is switched on and transmits the driving current, and the second light-emitting structure emits light under the driving of the driving current output by the second switch unit.
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